| // Copyright (c) 2004-2011 Sergey Lyubka |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a copy |
| // of this software and associated documentation files (the "Software"), to deal |
| // in the Software without restriction, including without limitation the rights |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| // copies of the Software, and to permit persons to whom the Software is |
| // furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included in |
| // all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| // THE SOFTWARE. |
| |
| #if defined(_WIN32) |
| #define _CRT_SECURE_NO_WARNINGS // Disable deprecation warning in VS2005 |
| #else |
| #define _XOPEN_SOURCE 600 // For flockfile() on Linux |
| #define _LARGEFILE_SOURCE // Enable 64-bit file offsets |
| #ifndef __STDC_FORMAT_MACROS |
| #define __STDC_FORMAT_MACROS // <inttypes.h> wants this for C++ |
| #endif // __STDC_FORMAT_MACROS |
| #endif |
| |
| #if defined(__SYMBIAN32__) |
| #define NO_SSL // SSL is not supported |
| #define NO_CGI // CGI is not supported |
| #define PATH_MAX FILENAME_MAX |
| #endif // __SYMBIAN32__ |
| |
| #ifndef _WIN32_WCE // Some ANSI #includes are not available on Windows CE |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <fcntl.h> |
| #endif // !_WIN32_WCE |
| |
| #include <time.h> |
| #include <stdlib.h> |
| #include <stdarg.h> |
| #include <assert.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <limits.h> |
| #include <stddef.h> |
| #include <stdio.h> |
| |
| #if defined(_WIN32) && !defined(__SYMBIAN32__) // Windows specific |
| #ifdef _WIN32_WINNT |
| #undef _WIN32_WINNT |
| #endif |
| #define _WIN32_WINNT 0x0400 // To make it link in VS2005 |
| #include <windows.h> |
| #include <winsock2.h> |
| |
| #ifndef PATH_MAX |
| #define PATH_MAX MAX_PATH |
| #endif |
| |
| #ifndef _WIN32_WCE |
| #include <process.h> |
| #include <direct.h> |
| #include <io.h> |
| #else // _WIN32_WCE |
| #define NO_CGI // WinCE has no pipes |
| |
| typedef long off_t; |
| #define BUFSIZ 4096 |
| |
| #define errno GetLastError() |
| #define strerror(x) _ultoa(x, (char *) _alloca(sizeof(x) *3 ), 10) |
| #endif // _WIN32_WCE |
| |
| #define MAKEUQUAD(lo, hi) ((uint64_t)(((uint32_t)(lo)) | \ |
| ((uint64_t)((uint32_t)(hi))) << 32)) |
| #define RATE_DIFF 10000000 // 100 nsecs |
| #define EPOCH_DIFF MAKEUQUAD(0xd53e8000, 0x019db1de) |
| #define SYS2UNIX_TIME(lo, hi) \ |
| (time_t) ((MAKEUQUAD((lo), (hi)) - EPOCH_DIFF) / RATE_DIFF) |
| |
| // Visual Studio 6 does not know __func__ or __FUNCTION__ |
| // The rest of MS compilers use __FUNCTION__, not C99 __func__ |
| // Also use _strtoui64 on modern M$ compilers |
| #if defined(_MSC_VER) && _MSC_VER < 1300 |
| #define STRX(x) #x |
| #define STR(x) STRX(x) |
| #define __func__ "line " STR(__LINE__) |
| #define strtoull(x, y, z) strtoul(x, y, z) |
| #define strtoll(x, y, z) strtol(x, y, z) |
| #else |
| #define __func__ __FUNCTION__ |
| #define strtoull(x, y, z) _strtoui64(x, y, z) |
| #define strtoll(x, y, z) _strtoi64(x, y, z) |
| #endif // _MSC_VER |
| |
| #define ERRNO GetLastError() |
| #define NO_SOCKLEN_T |
| #define SSL_LIB "ssleay32.dll" |
| #define CRYPTO_LIB "libeay32.dll" |
| #define DIRSEP '\\' |
| #define IS_DIRSEP_CHAR(c) ((c) == '/' || (c) == '\\') |
| #define O_NONBLOCK 0 |
| #if !defined(EWOULDBLOCK) |
| #define EWOULDBLOCK WSAEWOULDBLOCK |
| #endif // !EWOULDBLOCK |
| #define _POSIX_ |
| #define INT64_FMT "I64d" |
| |
| #define WINCDECL __cdecl |
| #define SHUT_WR 1 |
| #define snprintf _snprintf |
| #define vsnprintf _vsnprintf |
| #define sleep(x) Sleep((x) * 1000) |
| |
| #define pipe(x) _pipe(x, BUFSIZ, _O_BINARY) |
| #define popen(x, y) _popen(x, y) |
| #define pclose(x) _pclose(x) |
| #define close(x) _close(x) |
| #define dlsym(x,y) GetProcAddress((HINSTANCE) (x), (y)) |
| #define RTLD_LAZY 0 |
| #define fseeko(x, y, z) fseek((x), (y), (z)) |
| #define fdopen(x, y) _fdopen((x), (y)) |
| #define write(x, y, z) _write((x), (y), (unsigned) z) |
| #define read(x, y, z) _read((x), (y), (unsigned) z) |
| #define flockfile(x) (void) 0 |
| #define funlockfile(x) (void) 0 |
| |
| #if !defined(fileno) |
| #define fileno(x) _fileno(x) |
| #endif // !fileno MINGW #defines fileno |
| |
| typedef HANDLE pthread_mutex_t; |
| typedef struct {HANDLE signal, broadcast;} pthread_cond_t; |
| typedef DWORD pthread_t; |
| #define pid_t HANDLE // MINGW typedefs pid_t to int. Using #define here. |
| |
| struct timespec { |
| long tv_nsec; |
| long tv_sec; |
| }; |
| |
| static int pthread_mutex_lock(pthread_mutex_t *); |
| static int pthread_mutex_unlock(pthread_mutex_t *); |
| static FILE *mg_fopen(const char *path, const char *mode); |
| |
| #if defined(HAVE_STDINT) |
| #include <stdint.h> |
| #else |
| typedef unsigned int uint32_t; |
| typedef unsigned short uint16_t; |
| typedef unsigned __int64 uint64_t; |
| typedef __int64 int64_t; |
| #define INT64_MAX 9223372036854775807 |
| #endif // HAVE_STDINT |
| |
| // POSIX dirent interface |
| struct dirent { |
| char d_name[PATH_MAX]; |
| }; |
| |
| typedef struct DIR { |
| HANDLE handle; |
| WIN32_FIND_DATAW info; |
| struct dirent result; |
| } DIR; |
| |
| #else // UNIX specific |
| #include <sys/wait.h> |
| #include <sys/socket.h> |
| #include <sys/select.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <sys/time.h> |
| #include <stdint.h> |
| #include <inttypes.h> |
| #include <netdb.h> |
| |
| #include <pwd.h> |
| #include <unistd.h> |
| #include <dirent.h> |
| #if !defined(NO_SSL_DL) && !defined(NO_SSL) |
| #include <dlfcn.h> |
| #endif |
| #include <pthread.h> |
| #if defined(__MACH__) |
| #define SSL_LIB "libssl.dylib" |
| #define CRYPTO_LIB "libcrypto.dylib" |
| #else |
| #if !defined(SSL_LIB) |
| #define SSL_LIB "libssl.so" |
| #endif |
| #if !defined(CRYPTO_LIB) |
| #define CRYPTO_LIB "libcrypto.so" |
| #endif |
| #endif |
| #define DIRSEP '/' |
| #define IS_DIRSEP_CHAR(c) ((c) == '/') |
| #ifndef O_BINARY |
| #define O_BINARY 0 |
| #endif // O_BINARY |
| #define closesocket(a) close(a) |
| #define mg_fopen(x, y) fopen(x, y) |
| #define mg_mkdir(x, y) mkdir(x, y) |
| #define mg_remove(x) remove(x) |
| #define mg_rename(x, y) rename(x, y) |
| #define ERRNO errno |
| #define INVALID_SOCKET (-1) |
| #define INT64_FMT PRId64 |
| typedef int SOCKET; |
| #define WINCDECL |
| |
| #endif // End of Windows and UNIX specific includes |
| |
| #include "mongoose.h" |
| |
| #define MONGOOSE_VERSION "3.1" |
| #define PASSWORDS_FILE_NAME ".htpasswd" |
| #define CGI_ENVIRONMENT_SIZE 4096 |
| #define MAX_CGI_ENVIR_VARS 64 |
| #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0])) |
| |
| #ifdef _WIN32 |
| static pthread_t pthread_self(void) { |
| return GetCurrentThreadId(); |
| } |
| #endif // _WIN32 |
| |
| #if defined(DEBUG) |
| #define DEBUG_TRACE(x) do { \ |
| flockfile(stdout); \ |
| printf("*** %lu.%p.%s.%d: ", \ |
| (unsigned long) time(NULL), (void *) pthread_self(), \ |
| __func__, __LINE__); \ |
| printf x; \ |
| putchar('\n'); \ |
| fflush(stdout); \ |
| funlockfile(stdout); \ |
| } while (0) |
| #else |
| #define DEBUG_TRACE(x) |
| #endif // DEBUG |
| |
| // Darwin prior to 7.0 and Win32 do not have socklen_t |
| #ifdef NO_SOCKLEN_T |
| typedef int socklen_t; |
| #endif // NO_SOCKLEN_T |
| |
| typedef void * (*mg_thread_func_t)(void *); |
| |
| static const char *http_500_error = "Internal Server Error"; |
| |
| // Snatched from OpenSSL includes. I put the prototypes here to be independent |
| // from the OpenSSL source installation. Having this, mongoose + SSL can be |
| // built on any system with binary SSL libraries installed. |
| typedef struct ssl_st SSL; |
| typedef struct ssl_method_st SSL_METHOD; |
| typedef struct ssl_ctx_st SSL_CTX; |
| |
| #define SSL_ERROR_WANT_READ 2 |
| #define SSL_ERROR_WANT_WRITE 3 |
| #define SSL_FILETYPE_PEM 1 |
| #define CRYPTO_LOCK 1 |
| |
| #if defined(NO_SSL_DL) |
| extern void SSL_free(SSL *); |
| extern int SSL_accept(SSL *); |
| extern int SSL_connect(SSL *); |
| extern int SSL_read(SSL *, void *, int); |
| extern int SSL_write(SSL *, const void *, int); |
| extern int SSL_get_error(const SSL *, int); |
| extern int SSL_set_fd(SSL *, int); |
| extern SSL *SSL_new(SSL_CTX *); |
| extern SSL_CTX *SSL_CTX_new(SSL_METHOD *); |
| extern SSL_METHOD *SSLv23_server_method(void); |
| extern int SSL_library_init(void); |
| extern void SSL_load_error_strings(void); |
| extern int SSL_CTX_use_PrivateKey_file(SSL_CTX *, const char *, int); |
| extern int SSL_CTX_use_certificate_file(SSL_CTX *, const char *, int); |
| extern int SSL_CTX_use_certificate_chain_file(SSL_CTX *, const char *); |
| extern void SSL_CTX_set_default_passwd_cb(SSL_CTX *, mg_callback_t); |
| extern void SSL_CTX_free(SSL_CTX *); |
| extern unsigned long ERR_get_error(void); |
| extern char *ERR_error_string(unsigned long, char *); |
| extern int CRYPTO_num_locks(void); |
| extern void CRYPTO_set_locking_callback(void (*)(int, int, const char *, int)); |
| extern void CRYPTO_set_id_callback(unsigned long (*)(void)); |
| #else |
| // Dynamically loaded SSL functionality |
| struct ssl_func { |
| const char *name; // SSL function name |
| void (*ptr)(void); // Function pointer |
| }; |
| |
| #define SSL_free (* (void (*)(SSL *)) ssl_sw[0].ptr) |
| #define SSL_accept (* (int (*)(SSL *)) ssl_sw[1].ptr) |
| #define SSL_connect (* (int (*)(SSL *)) ssl_sw[2].ptr) |
| #define SSL_read (* (int (*)(SSL *, void *, int)) ssl_sw[3].ptr) |
| #define SSL_write (* (int (*)(SSL *, const void *,int)) ssl_sw[4].ptr) |
| #define SSL_get_error (* (int (*)(SSL *, int)) ssl_sw[5].ptr) |
| #define SSL_set_fd (* (int (*)(SSL *, SOCKET)) ssl_sw[6].ptr) |
| #define SSL_new (* (SSL * (*)(SSL_CTX *)) ssl_sw[7].ptr) |
| #define SSL_CTX_new (* (SSL_CTX * (*)(SSL_METHOD *)) ssl_sw[8].ptr) |
| #define SSLv23_server_method (* (SSL_METHOD * (*)(void)) ssl_sw[9].ptr) |
| #define SSL_library_init (* (int (*)(void)) ssl_sw[10].ptr) |
| #define SSL_CTX_use_PrivateKey_file (* (int (*)(SSL_CTX *, \ |
| const char *, int)) ssl_sw[11].ptr) |
| #define SSL_CTX_use_certificate_file (* (int (*)(SSL_CTX *, \ |
| const char *, int)) ssl_sw[12].ptr) |
| #define SSL_CTX_set_default_passwd_cb \ |
| (* (void (*)(SSL_CTX *, mg_callback_t)) ssl_sw[13].ptr) |
| #define SSL_CTX_free (* (void (*)(SSL_CTX *)) ssl_sw[14].ptr) |
| #define SSL_load_error_strings (* (void (*)(void)) ssl_sw[15].ptr) |
| #define SSL_CTX_use_certificate_chain_file \ |
| (* (int (*)(SSL_CTX *, const char *)) ssl_sw[16].ptr) |
| |
| #define CRYPTO_num_locks (* (int (*)(void)) crypto_sw[0].ptr) |
| #define CRYPTO_set_locking_callback \ |
| (* (void (*)(void (*)(int, int, const char *, int))) crypto_sw[1].ptr) |
| #define CRYPTO_set_id_callback \ |
| (* (void (*)(unsigned long (*)(void))) crypto_sw[2].ptr) |
| #define ERR_get_error (* (unsigned long (*)(void)) crypto_sw[3].ptr) |
| #define ERR_error_string (* (char * (*)(unsigned long,char *)) crypto_sw[4].ptr) |
| |
| // set_ssl_option() function updates this array. |
| // It loads SSL library dynamically and changes NULLs to the actual addresses |
| // of respective functions. The macros above (like SSL_connect()) are really |
| // just calling these functions indirectly via the pointer. |
| static struct ssl_func ssl_sw[] = { |
| {"SSL_free", NULL}, |
| {"SSL_accept", NULL}, |
| {"SSL_connect", NULL}, |
| {"SSL_read", NULL}, |
| {"SSL_write", NULL}, |
| {"SSL_get_error", NULL}, |
| {"SSL_set_fd", NULL}, |
| {"SSL_new", NULL}, |
| {"SSL_CTX_new", NULL}, |
| {"SSLv23_server_method", NULL}, |
| {"SSL_library_init", NULL}, |
| {"SSL_CTX_use_PrivateKey_file", NULL}, |
| {"SSL_CTX_use_certificate_file",NULL}, |
| {"SSL_CTX_set_default_passwd_cb",NULL}, |
| {"SSL_CTX_free", NULL}, |
| {"SSL_load_error_strings", NULL}, |
| {"SSL_CTX_use_certificate_chain_file", NULL}, |
| {NULL, NULL} |
| }; |
| |
| // Similar array as ssl_sw. These functions could be located in different lib. |
| static struct ssl_func crypto_sw[] = { |
| {"CRYPTO_num_locks", NULL}, |
| {"CRYPTO_set_locking_callback", NULL}, |
| {"CRYPTO_set_id_callback", NULL}, |
| {"ERR_get_error", NULL}, |
| {"ERR_error_string", NULL}, |
| {NULL, NULL} |
| }; |
| #endif // NO_SSL_DL |
| |
| static const char *month_names[] = { |
| "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
| "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" |
| }; |
| |
| // Unified socket address. For IPv6 support, add IPv6 address structure |
| // in the union u. |
| struct usa { |
| socklen_t len; |
| union { |
| struct sockaddr sa; |
| struct sockaddr_in sin; |
| } u; |
| }; |
| |
| // Describes a string (chunk of memory). |
| struct vec { |
| const char *ptr; |
| size_t len; |
| }; |
| |
| // Structure used by mg_stat() function. Uses 64 bit file length. |
| struct mgstat { |
| int is_directory; // Directory marker |
| int64_t size; // File size |
| time_t mtime; // Modification time |
| }; |
| |
| // Describes listening socket, or socket which was accept()-ed by the master |
| // thread and queued for future handling by the worker thread. |
| struct socket { |
| struct socket *next; // Linkage |
| SOCKET sock; // Listening socket |
| struct usa lsa; // Local socket address |
| struct usa rsa; // Remote socket address |
| int is_ssl; // Is socket SSL-ed |
| int is_proxy; |
| }; |
| |
| enum { |
| CGI_EXTENSIONS, CGI_ENVIRONMENT, PUT_DELETE_PASSWORDS_FILE, CGI_INTERPRETER, |
| PROTECT_URI, AUTHENTICATION_DOMAIN, SSI_EXTENSIONS, ACCESS_LOG_FILE, |
| SSL_CHAIN_FILE, ENABLE_DIRECTORY_LISTING, ERROR_LOG_FILE, |
| GLOBAL_PASSWORDS_FILE, INDEX_FILES, |
| ENABLE_KEEP_ALIVE, ACCESS_CONTROL_LIST, MAX_REQUEST_SIZE, |
| EXTRA_MIME_TYPES, LISTENING_PORTS, |
| DOCUMENT_ROOT, SSL_CERTIFICATE, NUM_THREADS, RUN_AS_USER, |
| NUM_OPTIONS |
| }; |
| |
| static const char *config_options[] = { |
| "C", "cgi_extensions", ".cgi,.pl,.php", |
| "E", "cgi_environment", NULL, |
| "G", "put_delete_passwords_file", NULL, |
| "I", "cgi_interpreter", NULL, |
| "P", "protect_uri", NULL, |
| "R", "authentication_domain", "mydomain.com", |
| "S", "ssi_extensions", ".shtml,.shtm", |
| "a", "access_log_file", NULL, |
| "c", "ssl_chain_file", NULL, |
| "d", "enable_directory_listing", "yes", |
| "e", "error_log_file", NULL, |
| "g", "global_passwords_file", NULL, |
| "i", "index_files", "index.html,index.htm,index.cgi", |
| "k", "enable_keep_alive", "no", |
| "l", "access_control_list", NULL, |
| "M", "max_request_size", "16384", |
| "m", "extra_mime_types", NULL, |
| "p", "listening_ports", "8080", |
| "r", "document_root", ".", |
| "s", "ssl_certificate", NULL, |
| "t", "num_threads", "10", |
| "u", "run_as_user", NULL, |
| NULL |
| }; |
| #define ENTRIES_PER_CONFIG_OPTION 3 |
| |
| struct mg_context { |
| volatile int stop_flag; // Should we stop event loop |
| SSL_CTX *ssl_ctx; // SSL context |
| char *config[NUM_OPTIONS]; // Mongoose configuration parameters |
| mg_callback_t user_callback; // User-defined callback function |
| void *user_data; // User-defined data |
| |
| struct socket *listening_sockets; |
| |
| volatile int num_threads; // Number of threads |
| pthread_mutex_t mutex; // Protects (max|num)_threads |
| pthread_cond_t cond; // Condvar for tracking workers terminations |
| |
| struct socket queue[20]; // Accepted sockets |
| volatile int sq_head; // Head of the socket queue |
| volatile int sq_tail; // Tail of the socket queue |
| pthread_cond_t sq_full; // Singaled when socket is produced |
| pthread_cond_t sq_empty; // Signaled when socket is consumed |
| }; |
| |
| struct mg_connection { |
| struct mg_connection *peer; // Remote target in proxy mode |
| struct mg_request_info request_info; |
| struct mg_context *ctx; |
| SSL *ssl; // SSL descriptor |
| struct socket client; // Connected client |
| time_t birth_time; // Time connection was accepted |
| int64_t num_bytes_sent; // Total bytes sent to client |
| int64_t content_len; // Content-Length header value |
| int64_t consumed_content; // How many bytes of content is already read |
| char *buf; // Buffer for received data |
| int buf_size; // Buffer size |
| int request_len; // Size of the request + headers in a buffer |
| int data_len; // Total size of data in a buffer |
| }; |
| |
| const char **mg_get_valid_option_names(void) { |
| return config_options; |
| } |
| |
| static void *call_user(struct mg_connection *conn, enum mg_event event) { |
| conn->request_info.user_data = conn->ctx->user_data; |
| return conn->ctx->user_callback == NULL ? NULL : |
| conn->ctx->user_callback(event, conn, &conn->request_info); |
| } |
| |
| static int get_option_index(const char *name) { |
| int i; |
| |
| for (i = 0; config_options[i] != NULL; i += ENTRIES_PER_CONFIG_OPTION) { |
| if (strcmp(config_options[i], name) == 0 || |
| strcmp(config_options[i + 1], name) == 0) { |
| return i / ENTRIES_PER_CONFIG_OPTION; |
| } |
| } |
| return -1; |
| } |
| |
| const char *mg_get_option(const struct mg_context *ctx, const char *name) { |
| int i; |
| if ((i = get_option_index(name)) == -1) { |
| return NULL; |
| } else if (ctx->config[i] == NULL) { |
| return ""; |
| } else { |
| return ctx->config[i]; |
| } |
| } |
| |
| // Print error message to the opened error log stream. |
| static void cry(struct mg_connection *conn, const char *fmt, ...) { |
| char buf[BUFSIZ]; |
| va_list ap; |
| FILE *fp; |
| time_t timestamp; |
| |
| va_start(ap, fmt); |
| (void) vsnprintf(buf, sizeof(buf), fmt, ap); |
| va_end(ap); |
| |
| // Do not lock when getting the callback value, here and below. |
| // I suppose this is fine, since function cannot disappear in the |
| // same way string option can. |
| conn->request_info.log_message = buf; |
| if (call_user(conn, MG_EVENT_LOG) == NULL) { |
| fp = conn->ctx->config[ERROR_LOG_FILE] == NULL ? NULL : |
| mg_fopen(conn->ctx->config[ERROR_LOG_FILE], "a+"); |
| |
| if (fp != NULL) { |
| flockfile(fp); |
| timestamp = time(NULL); |
| |
| (void) fprintf(fp, |
| "[%010lu] [error] [client %s] ", |
| (unsigned long) timestamp, |
| inet_ntoa(conn->client.rsa.u.sin.sin_addr)); |
| |
| if (conn->request_info.request_method != NULL) { |
| (void) fprintf(fp, "%s %s: ", |
| conn->request_info.request_method, |
| conn->request_info.uri); |
| } |
| |
| (void) fprintf(fp, "%s", buf); |
| fputc('\n', fp); |
| funlockfile(fp); |
| if (fp != stderr) { |
| fclose(fp); |
| } |
| } |
| } |
| conn->request_info.log_message = NULL; |
| } |
| |
| // Return OpenSSL error message |
| static const char *ssl_error(void) { |
| unsigned long err; |
| err = ERR_get_error(); |
| return err == 0 ? "" : ERR_error_string(err, NULL); |
| } |
| |
| // Return fake connection structure. Used for logging, if connection |
| // is not applicable at the moment of logging. |
| static struct mg_connection *fc(struct mg_context *ctx) { |
| static struct mg_connection fake_connection; |
| fake_connection.ctx = ctx; |
| return &fake_connection; |
| } |
| |
| const char *mg_version(void) { |
| return MONGOOSE_VERSION; |
| } |
| |
| static void mg_strlcpy(register char *dst, register const char *src, size_t n) { |
| for (; *src != '\0' && n > 1; n--) { |
| *dst++ = *src++; |
| } |
| *dst = '\0'; |
| } |
| |
| static int lowercase(const char *s) { |
| return tolower(* (const unsigned char *) s); |
| } |
| |
| static int mg_strncasecmp(const char *s1, const char *s2, size_t len) { |
| int diff = 0; |
| |
| if (len > 0) |
| do { |
| diff = lowercase(s1++) - lowercase(s2++); |
| } while (diff == 0 && s1[-1] != '\0' && --len > 0); |
| |
| return diff; |
| } |
| |
| static int mg_strcasecmp(const char *s1, const char *s2) { |
| int diff; |
| |
| do { |
| diff = lowercase(s1++) - lowercase(s2++); |
| } while (diff == 0 && s1[-1] != '\0'); |
| |
| return diff; |
| } |
| |
| static char * mg_strndup(const char *ptr, size_t len) { |
| char *p; |
| |
| if ((p = (char *) malloc(len + 1)) != NULL) { |
| mg_strlcpy(p, ptr, len + 1); |
| } |
| |
| return p; |
| } |
| |
| static char * mg_strdup(const char *str) { |
| return mg_strndup(str, strlen(str)); |
| } |
| |
| // Like snprintf(), but never returns negative value, or the value |
| // that is larger than a supplied buffer. |
| // Thanks to Adam Zeldis to pointing snprintf()-caused vulnerability |
| // in his audit report. |
| static int mg_vsnprintf(struct mg_connection *conn, char *buf, size_t buflen, |
| const char *fmt, va_list ap) { |
| int n; |
| |
| if (buflen == 0) |
| return 0; |
| |
| n = vsnprintf(buf, buflen, fmt, ap); |
| |
| if (n < 0) { |
| cry(conn, "vsnprintf error"); |
| n = 0; |
| } else if (n >= (int) buflen) { |
| cry(conn, "truncating vsnprintf buffer: [%.*s]", |
| n > 200 ? 200 : n, buf); |
| n = (int) buflen - 1; |
| } |
| buf[n] = '\0'; |
| |
| return n; |
| } |
| |
| static int mg_snprintf(struct mg_connection *conn, char *buf, size_t buflen, |
| const char *fmt, ...) { |
| va_list ap; |
| int n; |
| |
| va_start(ap, fmt); |
| n = mg_vsnprintf(conn, buf, buflen, fmt, ap); |
| va_end(ap); |
| |
| return n; |
| } |
| |
| // Skip the characters until one of the delimiters characters found. |
| // 0-terminate resulting word. Skip the delimiter and following whitespaces if any. |
| // Advance pointer to buffer to the next word. Return found 0-terminated word. |
| // Delimiters can be quoted with quotechar. |
| static char *skip_quoted(char **buf, const char *delimiters, const char *whitespace, char quotechar) { |
| char *p, *begin_word, *end_word, *end_whitespace; |
| |
| begin_word = *buf; |
| end_word = begin_word + strcspn(begin_word, delimiters); |
| |
| // Check for quotechar |
| if (end_word > begin_word) { |
| p = end_word - 1; |
| while (*p == quotechar) { |
| // If there is anything beyond end_word, copy it |
| if (*end_word == '\0') { |
| *p = '\0'; |
| break; |
| } else { |
| size_t end_off = strcspn(end_word + 1, delimiters); |
| memmove (p, end_word, end_off + 1); |
| p += end_off; // p must correspond to end_word - 1 |
| end_word += end_off + 1; |
| } |
| } |
| for (p++; p < end_word; p++) { |
| *p = '\0'; |
| } |
| } |
| |
| if (*end_word == '\0') { |
| *buf = end_word; |
| } else { |
| end_whitespace = end_word + 1 + strspn(end_word + 1, whitespace); |
| |
| for (p = end_word; p < end_whitespace; p++) { |
| *p = '\0'; |
| } |
| |
| *buf = end_whitespace; |
| } |
| |
| return begin_word; |
| } |
| |
| // Simplified version of skip_quoted without quote char |
| // and whitespace == delimiters |
| static char *skip(char **buf, const char *delimiters) { |
| return skip_quoted(buf, delimiters, delimiters, 0); |
| } |
| |
| |
| // Return HTTP header value, or NULL if not found. |
| static const char *get_header(const struct mg_request_info *ri, |
| const char *name) { |
| int i; |
| |
| for (i = 0; i < ri->num_headers; i++) |
| if (!mg_strcasecmp(name, ri->http_headers[i].name)) |
| return ri->http_headers[i].value; |
| |
| return NULL; |
| } |
| |
| const char *mg_get_header(const struct mg_connection *conn, const char *name) { |
| return get_header(&conn->request_info, name); |
| } |
| |
| // A helper function for traversing comma separated list of values. |
| // It returns a list pointer shifted to the next value, of NULL if the end |
| // of the list found. |
| // Value is stored in val vector. If value has form "x=y", then eq_val |
| // vector is initialized to point to the "y" part, and val vector length |
| // is adjusted to point only to "x". |
| static const char *next_option(const char *list, struct vec *val, |
| struct vec *eq_val) { |
| if (list == NULL || *list == '\0') { |
| // End of the list |
| list = NULL; |
| } else { |
| val->ptr = list; |
| if ((list = strchr(val->ptr, ',')) != NULL) { |
| // Comma found. Store length and shift the list ptr |
| val->len = list - val->ptr; |
| list++; |
| } else { |
| // This value is the last one |
| list = val->ptr + strlen(val->ptr); |
| val->len = list - val->ptr; |
| } |
| |
| if (eq_val != NULL) { |
| // Value has form "x=y", adjust pointers and lengths |
| // so that val points to "x", and eq_val points to "y". |
| eq_val->len = 0; |
| eq_val->ptr = (const char *) memchr(val->ptr, '=', val->len); |
| if (eq_val->ptr != NULL) { |
| eq_val->ptr++; // Skip over '=' character |
| eq_val->len = val->ptr + val->len - eq_val->ptr; |
| val->len = (eq_val->ptr - val->ptr) - 1; |
| } |
| } |
| } |
| |
| return list; |
| } |
| |
| static int match_extension(const char *path, const char *ext_list) { |
| struct vec ext_vec; |
| size_t path_len; |
| |
| path_len = strlen(path); |
| |
| while ((ext_list = next_option(ext_list, &ext_vec, NULL)) != NULL) |
| if (ext_vec.len < path_len && |
| mg_strncasecmp(path + path_len - ext_vec.len, |
| ext_vec.ptr, ext_vec.len) == 0) |
| return 1; |
| |
| return 0; |
| } |
| |
| // HTTP 1.1 assumes keep alive if "Connection:" header is not set |
| // This function must tolerate situations when connection info is not |
| // set up, for example if request parsing failed. |
| static int should_keep_alive(const struct mg_connection *conn) { |
| const char *http_version = conn->request_info.http_version; |
| const char *header = mg_get_header(conn, "Connection"); |
| return (header == NULL && http_version && !strcmp(http_version, "1.1")) || |
| (header != NULL && !mg_strcasecmp(header, "keep-alive")); |
| } |
| |
| static const char *suggest_connection_header(const struct mg_connection *conn) { |
| return should_keep_alive(conn) ? "keep-alive" : "close"; |
| } |
| |
| static void send_http_error(struct mg_connection *conn, int status, |
| const char *reason, const char *fmt, ...) { |
| char buf[BUFSIZ]; |
| va_list ap; |
| int len; |
| |
| conn->request_info.status_code = status; |
| |
| if (call_user(conn, MG_HTTP_ERROR) == NULL) { |
| buf[0] = '\0'; |
| len = 0; |
| |
| // Errors 1xx, 204 and 304 MUST NOT send a body |
| if (status > 199 && status != 204 && status != 304) { |
| len = mg_snprintf(conn, buf, sizeof(buf), "Error %d: %s", status, reason); |
| cry(conn, "%s", buf); |
| buf[len++] = '\n'; |
| |
| va_start(ap, fmt); |
| len += mg_vsnprintf(conn, buf + len, sizeof(buf) - len, fmt, ap); |
| va_end(ap); |
| } |
| DEBUG_TRACE(("[%s]", buf)); |
| |
| mg_printf(conn, "HTTP/1.1 %d %s\r\n" |
| "Content-Type: text/plain\r\n" |
| "Content-Length: %d\r\n" |
| "Connection: %s\r\n\r\n", status, reason, len, |
| suggest_connection_header(conn)); |
| conn->num_bytes_sent += mg_printf(conn, "%s", buf); |
| } |
| } |
| |
| #if defined(_WIN32) && !defined(__SYMBIAN32__) |
| static int pthread_mutex_init(pthread_mutex_t *mutex, void *unused) { |
| unused = NULL; |
| *mutex = CreateMutex(NULL, FALSE, NULL); |
| return *mutex == NULL ? -1 : 0; |
| } |
| |
| static int pthread_mutex_destroy(pthread_mutex_t *mutex) { |
| return CloseHandle(*mutex) == 0 ? -1 : 0; |
| } |
| |
| static int pthread_mutex_lock(pthread_mutex_t *mutex) { |
| return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; |
| } |
| |
| static int pthread_mutex_unlock(pthread_mutex_t *mutex) { |
| return ReleaseMutex(*mutex) == 0 ? -1 : 0; |
| } |
| |
| static int pthread_cond_init(pthread_cond_t *cv, const void *unused) { |
| unused = NULL; |
| cv->signal = CreateEvent(NULL, FALSE, FALSE, NULL); |
| cv->broadcast = CreateEvent(NULL, TRUE, FALSE, NULL); |
| return cv->signal != NULL && cv->broadcast != NULL ? 0 : -1; |
| } |
| |
| static int pthread_cond_wait(pthread_cond_t *cv, pthread_mutex_t *mutex) { |
| HANDLE handles[2]; |
| handles[0] = cv->signal; |
| handles[1] = cv->broadcast; |
| ReleaseMutex(*mutex); |
| WaitForMultipleObjects(2, handles, FALSE, INFINITE); |
| return WaitForSingleObject(*mutex, INFINITE) == WAIT_OBJECT_0? 0 : -1; |
| } |
| |
| static int pthread_cond_signal(pthread_cond_t *cv) { |
| return SetEvent(cv->signal) == 0 ? -1 : 0; |
| } |
| |
| static int pthread_cond_broadcast(pthread_cond_t *cv) { |
| // Implementation with PulseEvent() has race condition, see |
| // http://www.cs.wustl.edu/~schmidt/win32-cv-1.html |
| return PulseEvent(cv->broadcast) == 0 ? -1 : 0; |
| } |
| |
| static int pthread_cond_destroy(pthread_cond_t *cv) { |
| return CloseHandle(cv->signal) && CloseHandle(cv->broadcast) ? 0 : -1; |
| } |
| |
| // For Windows, change all slashes to backslashes in path names. |
| static void change_slashes_to_backslashes(char *path) { |
| int i; |
| |
| for (i = 0; path[i] != '\0'; i++) { |
| if (path[i] == '/') |
| path[i] = '\\'; |
| // i > 0 check is to preserve UNC paths, like \\server\file.txt |
| if (path[i] == '\\' && i > 0) |
| while (path[i + 1] == '\\' || path[i + 1] == '/') |
| (void) memmove(path + i + 1, |
| path + i + 2, strlen(path + i + 1)); |
| } |
| } |
| |
| // Encode 'path' which is assumed UTF-8 string, into UNICODE string. |
| // wbuf and wbuf_len is a target buffer and its length. |
| static void to_unicode(const char *path, wchar_t *wbuf, size_t wbuf_len) { |
| char buf[PATH_MAX], buf2[PATH_MAX], *p; |
| |
| mg_strlcpy(buf, path, sizeof(buf)); |
| change_slashes_to_backslashes(buf); |
| |
| // Point p to the end of the file name |
| p = buf + strlen(buf) - 1; |
| |
| // Trim trailing backslash character |
| while (p > buf && *p == '\\' && p[-1] != ':') { |
| *p-- = '\0'; |
| } |
| |
| // Protect from CGI code disclosure. |
| // This is very nasty hole. Windows happily opens files with |
| // some garbage in the end of file name. So fopen("a.cgi ", "r") |
| // actually opens "a.cgi", and does not return an error! |
| if (*p == 0x20 || // No space at the end |
| (*p == 0x2e && p > buf) || // No '.' but allow '.' as full path |
| *p == 0x2b || // No '+' |
| (*p & ~0x7f)) { // And generally no non-ascii chars |
| (void) fprintf(stderr, "Rejecting suspicious path: [%s]", buf); |
| wbuf[0] = L'\0'; |
| } else { |
| // Convert to Unicode and back. If doubly-converted string does not |
| // match the original, something is fishy, reject. |
| MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, (int) wbuf_len); |
| WideCharToMultiByte(CP_UTF8, 0, wbuf, (int) wbuf_len, buf2, sizeof(buf2), |
| NULL, NULL); |
| if (strcmp(buf, buf2) != 0) { |
| wbuf[0] = L'\0'; |
| } |
| } |
| } |
| |
| #if defined(_WIN32_WCE) |
| static time_t time(time_t *ptime) { |
| time_t t; |
| SYSTEMTIME st; |
| FILETIME ft; |
| |
| GetSystemTime(&st); |
| SystemTimeToFileTime(&st, &ft); |
| t = SYS2UNIX_TIME(ft.dwLowDateTime, ft.dwHighDateTime); |
| |
| if (ptime != NULL) { |
| *ptime = t; |
| } |
| |
| return t; |
| } |
| |
| static struct tm *localtime(const time_t *ptime, struct tm *ptm) { |
| int64_t t = ((int64_t) *ptime) * RATE_DIFF + EPOCH_DIFF; |
| FILETIME ft, lft; |
| SYSTEMTIME st; |
| TIME_ZONE_INFORMATION tzinfo; |
| |
| if (ptm == NULL) { |
| return NULL; |
| } |
| |
| * (int64_t *) &ft = t; |
| FileTimeToLocalFileTime(&ft, &lft); |
| FileTimeToSystemTime(&lft, &st); |
| ptm->tm_year = st.wYear - 1900; |
| ptm->tm_mon = st.wMonth - 1; |
| ptm->tm_wday = st.wDayOfWeek; |
| ptm->tm_mday = st.wDay; |
| ptm->tm_hour = st.wHour; |
| ptm->tm_min = st.wMinute; |
| ptm->tm_sec = st.wSecond; |
| ptm->tm_yday = 0; // hope nobody uses this |
| ptm->tm_isdst = |
| GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_DAYLIGHT ? 1 : 0; |
| |
| return ptm; |
| } |
| |
| static struct tm *gmtime(const time_t *ptime, struct tm *ptm) { |
| // FIXME(lsm): fix this. |
| return localtime(ptime, ptm); |
| } |
| |
| static size_t strftime(char *dst, size_t dst_size, const char *fmt, |
| const struct tm *tm) { |
| (void) snprintf(dst, dst_size, "implement strftime() for WinCE"); |
| return 0; |
| } |
| #endif |
| |
| static int mg_rename(const char* oldname, const char* newname) { |
| wchar_t woldbuf[PATH_MAX]; |
| wchar_t wnewbuf[PATH_MAX]; |
| |
| to_unicode(oldname, woldbuf, ARRAY_SIZE(woldbuf)); |
| to_unicode(newname, wnewbuf, ARRAY_SIZE(wnewbuf)); |
| |
| return MoveFileW(woldbuf, wnewbuf) ? 0 : -1; |
| } |
| |
| |
| static FILE *mg_fopen(const char *path, const char *mode) { |
| wchar_t wbuf[PATH_MAX], wmode[20]; |
| |
| to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); |
| MultiByteToWideChar(CP_UTF8, 0, mode, -1, wmode, ARRAY_SIZE(wmode)); |
| |
| return _wfopen(wbuf, wmode); |
| } |
| |
| static int mg_stat(const char *path, struct mgstat *stp) { |
| int ok = -1; // Error |
| wchar_t wbuf[PATH_MAX]; |
| WIN32_FILE_ATTRIBUTE_DATA info; |
| |
| to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); |
| |
| if (GetFileAttributesExW(wbuf, GetFileExInfoStandard, &info) != 0) { |
| stp->size = MAKEUQUAD(info.nFileSizeLow, info.nFileSizeHigh); |
| stp->mtime = SYS2UNIX_TIME(info.ftLastWriteTime.dwLowDateTime, |
| info.ftLastWriteTime.dwHighDateTime); |
| stp->is_directory = |
| info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY; |
| ok = 0; // Success |
| } |
| |
| return ok; |
| } |
| |
| static int mg_remove(const char *path) { |
| wchar_t wbuf[PATH_MAX]; |
| to_unicode(path, wbuf, ARRAY_SIZE(wbuf)); |
| return DeleteFileW(wbuf) ? 0 : -1; |
| } |
| |
| static int mg_mkdir(const char *path, int mode) { |
| char buf[PATH_MAX]; |
| wchar_t wbuf[PATH_MAX]; |
| |
| mode = 0; // Unused |
| mg_strlcpy(buf, path, sizeof(buf)); |
| change_slashes_to_backslashes(buf); |
| |
| (void) MultiByteToWideChar(CP_UTF8, 0, buf, -1, wbuf, sizeof(wbuf)); |
| |
| return CreateDirectoryW(wbuf, NULL) ? 0 : -1; |
| } |
| |
| // Implementation of POSIX opendir/closedir/readdir for Windows. |
| static DIR * opendir(const char *name) { |
| DIR *dir = NULL; |
| wchar_t wpath[PATH_MAX]; |
| DWORD attrs; |
| |
| if (name == NULL) { |
| SetLastError(ERROR_BAD_ARGUMENTS); |
| } else if ((dir = (DIR *) malloc(sizeof(*dir))) == NULL) { |
| SetLastError(ERROR_NOT_ENOUGH_MEMORY); |
| } else { |
| to_unicode(name, wpath, ARRAY_SIZE(wpath)); |
| attrs = GetFileAttributesW(wpath); |
| if (attrs != 0xFFFFFFFF && |
| ((attrs & FILE_ATTRIBUTE_DIRECTORY) == FILE_ATTRIBUTE_DIRECTORY)) { |
| (void) wcscat(wpath, L"\\*"); |
| dir->handle = FindFirstFileW(wpath, &dir->info); |
| dir->result.d_name[0] = '\0'; |
| } else { |
| free(dir); |
| dir = NULL; |
| } |
| } |
| |
| return dir; |
| } |
| |
| static int closedir(DIR *dir) { |
| int result = 0; |
| |
| if (dir != NULL) { |
| if (dir->handle != INVALID_HANDLE_VALUE) |
| result = FindClose(dir->handle) ? 0 : -1; |
| |
| free(dir); |
| } else { |
| result = -1; |
| SetLastError(ERROR_BAD_ARGUMENTS); |
| } |
| |
| return result; |
| } |
| |
| struct dirent * readdir(DIR *dir) { |
| struct dirent *result = 0; |
| |
| if (dir) { |
| if (dir->handle != INVALID_HANDLE_VALUE) { |
| result = &dir->result; |
| (void) WideCharToMultiByte(CP_UTF8, 0, |
| dir->info.cFileName, -1, result->d_name, |
| sizeof(result->d_name), NULL, NULL); |
| |
| if (!FindNextFileW(dir->handle, &dir->info)) { |
| (void) FindClose(dir->handle); |
| dir->handle = INVALID_HANDLE_VALUE; |
| } |
| |
| } else { |
| SetLastError(ERROR_FILE_NOT_FOUND); |
| } |
| } else { |
| SetLastError(ERROR_BAD_ARGUMENTS); |
| } |
| |
| return result; |
| } |
| |
| #define set_close_on_exec(fd) // No FD_CLOEXEC on Windows |
| |
| static int start_thread(struct mg_context *ctx, mg_thread_func_t f, void *p) { |
| return _beginthread((void (__cdecl *)(void *)) f, 0, p) == -1L ? -1 : 0; |
| } |
| |
| static HANDLE dlopen(const char *dll_name, int flags) { |
| wchar_t wbuf[PATH_MAX]; |
| flags = 0; // Unused |
| to_unicode(dll_name, wbuf, ARRAY_SIZE(wbuf)); |
| return LoadLibraryW(wbuf); |
| } |
| |
| #if !defined(NO_CGI) |
| #define SIGKILL 0 |
| static int kill(pid_t pid, int sig_num) { |
| (void) TerminateProcess(pid, sig_num); |
| (void) CloseHandle(pid); |
| return 0; |
| } |
| |
| static pid_t spawn_process(struct mg_connection *conn, const char *prog, |
| char *envblk, char *envp[], int fd_stdin, |
| int fd_stdout, const char *dir) { |
| HANDLE me; |
| char *p, *interp, cmdline[PATH_MAX], buf[PATH_MAX]; |
| FILE *fp; |
| STARTUPINFOA si; |
| PROCESS_INFORMATION pi; |
| |
| envp = NULL; // Unused |
| |
| (void) memset(&si, 0, sizeof(si)); |
| (void) memset(&pi, 0, sizeof(pi)); |
| |
| // TODO(lsm): redirect CGI errors to the error log file |
| si.cb = sizeof(si); |
| si.dwFlags = STARTF_USESTDHANDLES | STARTF_USESHOWWINDOW; |
| si.wShowWindow = SW_HIDE; |
| |
| me = GetCurrentProcess(); |
| (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdin), me, |
| &si.hStdInput, 0, TRUE, DUPLICATE_SAME_ACCESS); |
| (void) DuplicateHandle(me, (HANDLE) _get_osfhandle(fd_stdout), me, |
| &si.hStdOutput, 0, TRUE, DUPLICATE_SAME_ACCESS); |
| |
| // If CGI file is a script, try to read the interpreter line |
| interp = conn->ctx->config[CGI_INTERPRETER]; |
| if (interp == NULL) { |
| buf[2] = '\0'; |
| mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%c%s", dir, DIRSEP, prog); |
| if ((fp = fopen(cmdline, "r")) != NULL) { |
| (void) fgets(buf, sizeof(buf), fp); |
| if (buf[0] != '#' || buf[1] != '!') { |
| // First line does not start with "#!". Do not set interpreter. |
| buf[2] = '\0'; |
| } else { |
| // Trim whitespaces in interpreter name |
| for (p = &buf[strlen(buf) - 1]; p > buf && isspace(*p); p--) { |
| *p = '\0'; |
| } |
| } |
| (void) fclose(fp); |
| } |
| interp = buf + 2; |
| } |
| |
| (void) mg_snprintf(conn, cmdline, sizeof(cmdline), "%s%s%s%c%s", |
| interp, interp[0] == '\0' ? "" : " ", dir, DIRSEP, prog); |
| |
| DEBUG_TRACE(("Running [%s]", cmdline)); |
| if (CreateProcessA(NULL, cmdline, NULL, NULL, TRUE, |
| CREATE_NEW_PROCESS_GROUP, envblk, dir, &si, &pi) == 0) { |
| cry(conn, "%s: CreateProcess(%s): %d", |
| __func__, cmdline, ERRNO); |
| pi.hProcess = (pid_t) -1; |
| } else { |
| (void) close(fd_stdin); |
| (void) close(fd_stdout); |
| } |
| |
| (void) CloseHandle(si.hStdOutput); |
| (void) CloseHandle(si.hStdInput); |
| (void) CloseHandle(pi.hThread); |
| |
| return (pid_t) pi.hProcess; |
| } |
| #endif // !NO_CGI |
| |
| static int set_non_blocking_mode(SOCKET sock) { |
| unsigned long on = 1; |
| return ioctlsocket(sock, FIONBIO, &on); |
| } |
| |
| #else |
| static int mg_stat(const char *path, struct mgstat *stp) { |
| struct stat st; |
| int ok; |
| |
| if (stat(path, &st) == 0) { |
| ok = 0; |
| stp->size = st.st_size; |
| stp->mtime = st.st_mtime; |
| stp->is_directory = S_ISDIR(st.st_mode); |
| } else { |
| ok = -1; |
| } |
| |
| return ok; |
| } |
| |
| static void set_close_on_exec(int fd) { |
| (void) fcntl(fd, F_SETFD, FD_CLOEXEC); |
| } |
| |
| static int start_thread(struct mg_context *ctx, mg_thread_func_t func, |
| void *param) { |
| pthread_t thread_id; |
| pthread_attr_t attr; |
| int retval; |
| |
| (void) pthread_attr_init(&attr); |
| (void) pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
| // TODO(lsm): figure out why mongoose dies on Linux if next line is enabled |
| // (void) pthread_attr_setstacksize(&attr, sizeof(struct mg_connection) * 5); |
| |
| if ((retval = pthread_create(&thread_id, &attr, func, param)) != 0) { |
| cry(fc(ctx), "%s: %s", __func__, strerror(retval)); |
| } |
| |
| return retval; |
| } |
| |
| #ifndef NO_CGI |
| static pid_t spawn_process(struct mg_connection *conn, const char *prog, |
| char *envblk, char *envp[], int fd_stdin, |
| int fd_stdout, const char *dir) { |
| pid_t pid; |
| const char *interp; |
| |
| envblk = NULL; // Unused |
| |
| if ((pid = fork()) == -1) { |
| // Parent |
| send_http_error(conn, 500, http_500_error, "fork(): %s", strerror(ERRNO)); |
| } else if (pid == 0) { |
| // Child |
| if (chdir(dir) != 0) { |
| cry(conn, "%s: chdir(%s): %s", __func__, dir, strerror(ERRNO)); |
| } else if (dup2(fd_stdin, 0) == -1) { |
| cry(conn, "%s: dup2(%d, 0): %s", __func__, fd_stdin, strerror(ERRNO)); |
| } else if (dup2(fd_stdout, 1) == -1) { |
| cry(conn, "%s: dup2(%d, 1): %s", __func__, fd_stdout, strerror(ERRNO)); |
| } else { |
| (void) dup2(fd_stdout, 2); |
| (void) close(fd_stdin); |
| (void) close(fd_stdout); |
| |
| // Execute CGI program. No need to lock: new process |
| interp = conn->ctx->config[CGI_INTERPRETER]; |
| if (interp == NULL) { |
| (void) execle(prog, prog, NULL, envp); |
| cry(conn, "%s: execle(%s): %s", __func__, prog, strerror(ERRNO)); |
| } else { |
| (void) execle(interp, interp, prog, NULL, envp); |
| cry(conn, "%s: execle(%s %s): %s", __func__, interp, prog, |
| strerror(ERRNO)); |
| } |
| } |
| exit(EXIT_FAILURE); |
| } else { |
| // Parent. Close stdio descriptors |
| (void) close(fd_stdin); |
| (void) close(fd_stdout); |
| } |
| |
| return pid; |
| } |
| #endif // !NO_CGI |
| |
| static int set_non_blocking_mode(SOCKET sock) { |
| int flags; |
| |
| flags = fcntl(sock, F_GETFL, 0); |
| (void) fcntl(sock, F_SETFL, flags | O_NONBLOCK); |
| |
| return 0; |
| } |
| #endif // _WIN32 |
| |
| // Write data to the IO channel - opened file descriptor, socket or SSL |
| // descriptor. Return number of bytes written. |
| static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf, |
| int64_t len) { |
| int64_t sent; |
| int n, k; |
| |
| sent = 0; |
| while (sent < len) { |
| |
| // How many bytes we send in this iteration |
| k = len - sent > INT_MAX ? INT_MAX : (int) (len - sent); |
| |
| if (ssl != NULL) { |
| n = SSL_write(ssl, buf + sent, k); |
| } else if (fp != NULL) { |
| n = fwrite(buf + sent, 1, (size_t)k, fp); |
| if (ferror(fp)) |
| n = -1; |
| } else { |
| n = send(sock, buf + sent, (size_t)k, 0); |
| } |
| |
| if (n < 0) |
| break; |
| |
| sent += n; |
| } |
| |
| return sent; |
| } |
| |
| // Read from IO channel - opened file descriptor, socket, or SSL descriptor. |
| // Return number of bytes read. |
| static int pull(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int len) { |
| int nread; |
| |
| if (ssl != NULL) { |
| nread = SSL_read(ssl, buf, len); |
| } else if (fp != NULL) { |
| // Use read() instead of fread(), because if we're reading from the CGI |
| // pipe, fread() may block until IO buffer is filled up. We cannot afford |
| // to block and must pass all read bytes immediately to the client. |
| nread = read(fileno(fp), buf, (size_t) len); |
| if (ferror(fp)) |
| nread = -1; |
| } else { |
| nread = recv(sock, buf, (size_t) len, 0); |
| } |
| |
| return nread; |
| } |
| |
| int mg_read(struct mg_connection *conn, void *buf, size_t len) { |
| int n, buffered_len, nread; |
| const char *buffered; |
| |
| assert((conn->content_len == -1 && conn->consumed_content == 0) || |
| conn->consumed_content <= conn->content_len); |
| DEBUG_TRACE(("%p %zu %lld %lld", buf, len, |
| conn->content_len, conn->consumed_content)); |
| nread = 0; |
| if (conn->consumed_content < conn->content_len) { |
| |
| // Adjust number of bytes to read. |
| int64_t to_read = conn->content_len - conn->consumed_content; |
| if (to_read < (int64_t) len) { |
| len = (int) to_read; |
| } |
| |
| // How many bytes of data we have buffered in the request buffer? |
| buffered = conn->buf + conn->request_len + conn->consumed_content; |
| buffered_len = conn->data_len - conn->request_len; |
| assert(buffered_len >= 0); |
| |
| // Return buffered data back if we haven't done that yet. |
| if (conn->consumed_content < (int64_t) buffered_len) { |
| buffered_len -= (int) conn->consumed_content; |
| if (len < (size_t) buffered_len) { |
| buffered_len = len; |
| } |
| memcpy(buf, buffered, (size_t)buffered_len); |
| len -= buffered_len; |
| buf = (char *) buf + buffered_len; |
| conn->consumed_content += buffered_len; |
| nread = buffered_len; |
| } |
| |
| // We have returned all buffered data. Read new data from the remote socket. |
| while (len > 0) { |
| n = pull(NULL, conn->client.sock, conn->ssl, (char *) buf, (int) len); |
| if (n <= 0) { |
| break; |
| } |
| buf = (char *) buf + n; |
| conn->consumed_content += n; |
| nread += n; |
| len -= n; |
| } |
| } |
| return nread; |
| } |
| |
| int mg_write(struct mg_connection *conn, const void *buf, size_t len) { |
| return (int) push(NULL, conn->client.sock, conn->ssl, |
| (const char *) buf, (int64_t) len); |
| } |
| |
| int mg_printf(struct mg_connection *conn, const char *fmt, ...) { |
| char buf[BUFSIZ]; |
| int len; |
| va_list ap; |
| |
| va_start(ap, fmt); |
| len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap); |
| va_end(ap); |
| |
| return mg_write(conn, buf, (size_t)len); |
| } |
| |
| // URL-decode input buffer into destination buffer. |
| // 0-terminate the destination buffer. Return the length of decoded data. |
| // form-url-encoded data differs from URI encoding in a way that it |
| // uses '+' as character for space, see RFC 1866 section 8.2.1 |
| // http://ftp.ics.uci.edu/pub/ietf/html/rfc1866.txt |
| static size_t url_decode(const char *src, size_t src_len, char *dst, |
| size_t dst_len, int is_form_url_encoded) { |
| size_t i, j; |
| int a, b; |
| #define HEXTOI(x) (isdigit(x) ? x - '0' : x - 'W') |
| |
| for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) { |
| if (src[i] == '%' && |
| isxdigit(* (const unsigned char *) (src + i + 1)) && |
| isxdigit(* (const unsigned char *) (src + i + 2))) { |
| a = tolower(* (const unsigned char *) (src + i + 1)); |
| b = tolower(* (const unsigned char *) (src + i + 2)); |
| dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b)); |
| i += 2; |
| } else if (is_form_url_encoded && src[i] == '+') { |
| dst[j] = ' '; |
| } else { |
| dst[j] = src[i]; |
| } |
| } |
| |
| dst[j] = '\0'; // Null-terminate the destination |
| |
| return j; |
| } |
| |
| // Scan given buffer and fetch the value of the given variable. |
| // It can be specified in query string, or in the POST data. |
| // Return NULL if the variable not found, or allocated 0-terminated value. |
| // It is caller's responsibility to free the returned value. |
| int mg_get_var(const char *buf, size_t buf_len, const char *name, |
| char *dst, size_t dst_len) { |
| const char *p, *e, *s; |
| size_t name_len, len; |
| |
| name_len = strlen(name); |
| e = buf + buf_len; |
| len = -1; |
| dst[0] = '\0'; |
| |
| // buf is "var1=val1&var2=val2...". Find variable first |
| for (p = buf; p != NULL && p + name_len < e; p++) { |
| if ((p == buf || p[-1] == '&') && p[name_len] == '=' && |
| !mg_strncasecmp(name, p, name_len)) { |
| |
| // Point p to variable value |
| p += name_len + 1; |
| |
| // Point s to the end of the value |
| s = (const char *) memchr(p, '&', (size_t)(e - p)); |
| if (s == NULL) { |
| s = e; |
| } |
| assert(s >= p); |
| |
| // Decode variable into destination buffer |
| if ((size_t) (s - p) < dst_len) { |
| len = url_decode(p, (size_t)(s - p), dst, dst_len, 1); |
| } |
| break; |
| } |
| } |
| |
| return len; |
| } |
| |
| int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name, |
| char *dst, size_t dst_size) { |
| const char *s, *p, *end; |
| int name_len, len = -1; |
| |
| dst[0] = '\0'; |
| if ((s = mg_get_header(conn, "Cookie")) == NULL) { |
| return 0; |
| } |
| |
| name_len = strlen(cookie_name); |
| end = s + strlen(s); |
| |
| for (; (s = strstr(s, cookie_name)) != NULL; s += name_len) |
| if (s[name_len] == '=') { |
| s += name_len + 1; |
| if ((p = strchr(s, ' ')) == NULL) |
| p = end; |
| if (p[-1] == ';') |
| p--; |
| if (*s == '"' && p[-1] == '"' && p > s + 1) { |
| s++; |
| p--; |
| } |
| if ((size_t) (p - s) < dst_size) { |
| len = (p - s) + 1; |
| mg_strlcpy(dst, s, (size_t)len); |
| } |
| break; |
| } |
| |
| return len; |
| } |
| |
| // Mongoose allows to specify multiple directories to serve, |
| // like /var/www,/~bob=/home/bob. That means that root directory depends on URI. |
| // This function returns root dir for given URI. |
| static int get_document_root(const struct mg_connection *conn, |
| struct vec *document_root) { |
| const char *root, *uri; |
| int len_of_matched_uri; |
| struct vec uri_vec, path_vec; |
| |
| uri = conn->request_info.uri; |
| len_of_matched_uri = 0; |
| root = next_option(conn->ctx->config[DOCUMENT_ROOT], document_root, NULL); |
| |
| while ((root = next_option(root, &uri_vec, &path_vec)) != NULL) { |
| if (memcmp(uri, uri_vec.ptr, uri_vec.len) == 0) { |
| *document_root = path_vec; |
| len_of_matched_uri = uri_vec.len; |
| break; |
| } |
| } |
| |
| return len_of_matched_uri; |
| } |
| |
| static void convert_uri_to_file_name(struct mg_connection *conn, |
| const char *uri, char *buf, |
| size_t buf_len) { |
| struct vec vec; |
| int match_len; |
| |
| match_len = get_document_root(conn, &vec); |
| mg_snprintf(conn, buf, buf_len, "%.*s%s", vec.len, vec.ptr, uri + match_len); |
| |
| #if defined(_WIN32) && !defined(__SYMBIAN32__) |
| change_slashes_to_backslashes(buf); |
| #endif // _WIN32 |
| |
| DEBUG_TRACE(("[%s] -> [%s], [%.*s]", uri, buf, (int) vec.len, vec.ptr)); |
| } |
| |
| static int sslize(struct mg_connection *conn, int (*func)(SSL *)) { |
| return (conn->ssl = SSL_new(conn->ctx->ssl_ctx)) != NULL && |
| SSL_set_fd(conn->ssl, conn->client.sock) == 1 && |
| func(conn->ssl) == 1; |
| } |
| |
| static struct mg_connection *mg_connect(struct mg_connection *conn, |
| const char *host, int port, int use_ssl) { |
| struct mg_connection *newconn = NULL; |
| struct sockaddr_in sin; |
| struct hostent *he; |
| int sock; |
| |
| if (conn->ctx->ssl_ctx == NULL && use_ssl) { |
| cry(conn, "%s: SSL is not initialized", __func__); |
| } else if ((he = gethostbyname(host)) == NULL) { |
| cry(conn, "%s: gethostbyname(%s): %s", __func__, host, strerror(ERRNO)); |
| } else if ((sock = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) { |
| cry(conn, "%s: socket: %s", __func__, strerror(ERRNO)); |
| } else { |
| sin.sin_family = AF_INET; |
| sin.sin_port = htons((uint16_t) port); |
| sin.sin_addr = * (struct in_addr *) he->h_addr_list[0]; |
| if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) != 0) { |
| cry(conn, "%s: connect(%s:%d): %s", __func__, host, port, |
| strerror(ERRNO)); |
| closesocket(sock); |
| } else if ((newconn = (struct mg_connection *) |
| calloc(1, sizeof(*newconn))) == NULL) { |
| cry(conn, "%s: calloc: %s", __func__, strerror(ERRNO)); |
| closesocket(sock); |
| } else { |
| newconn->client.sock = sock; |
| newconn->client.rsa.u.sin = sin; |
| if (use_ssl) { |
| sslize(newconn, SSL_connect); |
| } |
| } |
| } |
| |
| return newconn; |
| } |
| |
| // Check whether full request is buffered. Return: |
| // -1 if request is malformed |
| // 0 if request is not yet fully buffered |
| // >0 actual request length, including last \r\n\r\n |
| static int get_request_len(const char *buf, int buflen) { |
| const char *s, *e; |
| int len = 0; |
| |
| DEBUG_TRACE(("buf: %p, len: %d", buf, buflen)); |
| for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++) |
| // Control characters are not allowed but >=128 is. |
| if (!isprint(* (const unsigned char *) s) && *s != '\r' && |
| *s != '\n' && * (const unsigned char *) s < 128) { |
| len = -1; |
| } else if (s[0] == '\n' && s[1] == '\n') { |
| len = (int) (s - buf) + 2; |
| } else if (s[0] == '\n' && &s[1] < e && |
| s[1] == '\r' && s[2] == '\n') { |
| len = (int) (s - buf) + 3; |
| } |
| |
| return len; |
| } |
| |
| // Convert month to the month number. Return -1 on error, or month number |
| static int get_month_index(const char *s) { |
| size_t i; |
| |
| for (i = 0; i < ARRAY_SIZE(month_names); i++) |
| if (!strcmp(s, month_names[i])) |
| return (int) i; |
| |
| return -1; |
| } |
| |
| // Parse UTC date-time string, and return the corresponding time_t value. |
| static time_t parse_date_string(const char *datetime) { |
| static const unsigned short days_before_month[] = { |
| 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 |
| }; |
| char month_str[32]; |
| int second, minute, hour, day, month, year, leap_days, days; |
| time_t result = (time_t) 0; |
| |
| if (((sscanf(datetime, "%d/%3s/%d %d:%d:%d", |
| &day, month_str, &year, &hour, &minute, &second) == 6) || |
| (sscanf(datetime, "%d %3s %d %d:%d:%d", |
| &day, month_str, &year, &hour, &minute, &second) == 6) || |
| (sscanf(datetime, "%*3s, %d %3s %d %d:%d:%d", |
| &day, month_str, &year, &hour, &minute, &second) == 6) || |
| (sscanf(datetime, "%d-%3s-%d %d:%d:%d", |
| &day, month_str, &year, &hour, &minute, &second) == 6)) && |
| year > 1970 && |
| (month = get_month_index(month_str)) != -1) { |
| year -= 1970; |
| leap_days = year / 4 - year / 100 + year / 400; |
| days = year * 365 + days_before_month[month] + (day - 1) + leap_days; |
| result = days * 24 * 3600 + hour * 3600 + minute * 60 + second; |
| } |
| |
| return result; |
| } |
| |
| // Protect against directory disclosure attack by removing '..', |
| // excessive '/' and '\' characters |
| static void remove_double_dots_and_double_slashes(char *s) { |
| char *p = s; |
| |
| while (*s != '\0') { |
| *p++ = *s++; |
| if (s[-1] == '/' || s[-1] == '\\') { |
| // Skip all following slashes and backslashes |
| while (*s == '/' || *s == '\\') { |
| s++; |
| } |
| |
| // Skip all double-dots |
| while (*s == '.' && s[1] == '.') { |
| s += 2; |
| } |
| } |
| } |
| *p = '\0'; |
| } |
| |
| static const struct { |
| const char *extension; |
| size_t ext_len; |
| const char *mime_type; |
| size_t mime_type_len; |
| } builtin_mime_types[] = { |
| {".html", 5, "text/html", 9}, |
| {".htm", 4, "text/html", 9}, |
| {".shtm", 5, "text/html", 9}, |
| {".shtml", 6, "text/html", 9}, |
| {".css", 4, "text/css", 8}, |
| {".js", 3, "application/x-javascript", 24}, |
| {".ico", 4, "image/x-icon", 12}, |
| {".gif", 4, "image/gif", 9}, |
| {".jpg", 4, "image/jpeg", 10}, |
| {".jpeg", 5, "image/jpeg", 10}, |
| {".png", 4, "image/png", 9}, |
| {".svg", 4, "image/svg+xml", 13}, |
| {".torrent", 8, "application/x-bittorrent", 24}, |
| {".wav", 4, "audio/x-wav", 11}, |
| {".mp3", 4, "audio/x-mp3", 11}, |
| {".mid", 4, "audio/mid", 9}, |
| {".m3u", 4, "audio/x-mpegurl", 15}, |
| {".ram", 4, "audio/x-pn-realaudio", 20}, |
| {".xml", 4, "text/xml", 8}, |
| {".xslt", 5, "application/xml", 15}, |
| {".ra", 3, "audio/x-pn-realaudio", 20}, |
| {".doc", 4, "application/msword", 19}, |
| {".exe", 4, "application/octet-stream", 24}, |
| {".zip", 4, "application/x-zip-compressed", 28}, |
| {".xls", 4, "application/excel", 17}, |
| {".tgz", 4, "application/x-tar-gz", 20}, |
| {".tar", 4, "application/x-tar", 17}, |
| {".gz", 3, "application/x-gunzip", 20}, |
| {".arj", 4, "application/x-arj-compressed", 28}, |
| {".rar", 4, "application/x-arj-compressed", 28}, |
| {".rtf", 4, "application/rtf", 15}, |
| {".pdf", 4, "application/pdf", 15}, |
| {".swf", 4, "application/x-shockwave-flash",29}, |
| {".mpg", 4, "video/mpeg", 10}, |
| {".mpeg", 5, "video/mpeg", 10}, |
| {".mp4", 4, "video/mp4", 9}, |
| {".m4v", 4, "video/x-m4v", 11}, |
| {".asf", 4, "video/x-ms-asf", 14}, |
| {".avi", 4, "video/x-msvideo", 15}, |
| {".bmp", 4, "image/bmp", 9}, |
| {NULL, 0, NULL, 0} |
| }; |
| |
| // Look at the "path" extension and figure what mime type it has. |
| // Store mime type in the vector. |
| static void get_mime_type(struct mg_context *ctx, const char *path, |
| struct vec *vec) { |
| struct vec ext_vec, mime_vec; |
| const char *list, *ext; |
| size_t i, path_len; |
| |
| path_len = strlen(path); |
| |
| // Scan user-defined mime types first, in case user wants to |
| // override default mime types. |
| list = ctx->config[EXTRA_MIME_TYPES]; |
| while ((list = next_option(list, &ext_vec, &mime_vec)) != NULL) { |
| // ext now points to the path suffix |
| ext = path + path_len - ext_vec.len; |
| if (mg_strncasecmp(ext, ext_vec.ptr, ext_vec.len) == 0) { |
| *vec = mime_vec; |
| return; |
| } |
| } |
| |
| // Now scan built-in mime types |
| for (i = 0; builtin_mime_types[i].extension != NULL; i++) { |
| ext = path + (path_len - builtin_mime_types[i].ext_len); |
| if (path_len > builtin_mime_types[i].ext_len && |
| mg_strcasecmp(ext, builtin_mime_types[i].extension) == 0) { |
| vec->ptr = builtin_mime_types[i].mime_type; |
| vec->len = builtin_mime_types[i].mime_type_len; |
| return; |
| } |
| } |
| |
| // Nothing found. Fall back to "text/plain" |
| vec->ptr = "text/plain"; |
| vec->len = 10; |
| } |
| |
| #ifndef HAVE_MD5 |
| typedef struct MD5Context { |
| uint32_t buf[4]; |
| uint32_t bits[2]; |
| unsigned char in[64]; |
| } MD5_CTX; |
| |
| #if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234) |
| #define byteReverse(buf, len) // Do nothing |
| #else |
| static void byteReverse(unsigned char *buf, unsigned longs) { |
| uint32_t t; |
| do { |
| t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 | |
| ((unsigned) buf[1] << 8 | buf[0]); |
| *(uint32_t *) buf = t; |
| buf += 4; |
| } while (--longs); |
| } |
| #endif |
| |
| #define F1(x, y, z) (z ^ (x & (y ^ z))) |
| #define F2(x, y, z) F1(z, x, y) |
| #define F3(x, y, z) (x ^ y ^ z) |
| #define F4(x, y, z) (y ^ (x | ~z)) |
| |
| #define MD5STEP(f, w, x, y, z, data, s) \ |
| ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) |
| |
| // Start MD5 accumulation. Set bit count to 0 and buffer to mysterious |
| // initialization constants. |
| static void MD5Init(MD5_CTX *ctx) { |
| ctx->buf[0] = 0x67452301; |
| ctx->buf[1] = 0xefcdab89; |
| ctx->buf[2] = 0x98badcfe; |
| ctx->buf[3] = 0x10325476; |
| |
| ctx->bits[0] = 0; |
| ctx->bits[1] = 0; |
| } |
| |
| static void MD5Transform(uint32_t buf[4], uint32_t const in[16]) { |
| register uint32_t a, b, c, d; |
| |
| a = buf[0]; |
| b = buf[1]; |
| c = buf[2]; |
| d = buf[3]; |
| |
| MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); |
| MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); |
| MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); |
| MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); |
| MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); |
| MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); |
| MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); |
| MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); |
| MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); |
| MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); |
| MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); |
| MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); |
| MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); |
| MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); |
| MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); |
| MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); |
| |
| MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); |
| MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); |
| MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); |
| MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); |
| MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); |
| MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); |
| MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); |
| MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); |
| MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); |
| MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); |
| MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); |
| MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); |
| MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); |
| MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); |
| MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); |
| MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); |
| |
| MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); |
| MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); |
| MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); |
| MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); |
| MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); |
| MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); |
| MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); |
| MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); |
| MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); |
| MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); |
| MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); |
| MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); |
| MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); |
| MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); |
| MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); |
| MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); |
| |
| MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); |
| MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); |
| MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); |
| MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); |
| MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); |
| MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); |
| MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); |
| MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); |
| MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); |
| MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); |
| MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); |
| MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); |
| MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); |
| MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); |
| MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); |
| MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); |
| |
| buf[0] += a; |
| buf[1] += b; |
| buf[2] += c; |
| buf[3] += d; |
| } |
| |
| static void MD5Update(MD5_CTX *ctx, unsigned char const *buf, unsigned len) { |
| uint32_t t; |
| |
| t = ctx->bits[0]; |
| if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t) |
| ctx->bits[1]++; |
| ctx->bits[1] += len >> 29; |
| |
| t = (t >> 3) & 0x3f; |
| |
| if (t) { |
| unsigned char *p = (unsigned char *) ctx->in + t; |
| |
| t = 64 - t; |
| if (len < t) { |
| memcpy(p, buf, len); |
| return; |
| } |
| memcpy(p, buf, t); |
| byteReverse(ctx->in, 16); |
| MD5Transform(ctx->buf, (uint32_t *) ctx->in); |
| buf += t; |
| len -= t; |
| } |
| |
| while (len >= 64) { |
| memcpy(ctx->in, buf, 64); |
| byteReverse(ctx->in, 16); |
| MD5Transform(ctx->buf, (uint32_t *) ctx->in); |
| buf += 64; |
| len -= 64; |
| } |
| |
| memcpy(ctx->in, buf, len); |
| } |
| |
| static void MD5Final(unsigned char digest[16], MD5_CTX *ctx) { |
| unsigned count; |
| unsigned char *p; |
| |
| count = (ctx->bits[0] >> 3) & 0x3F; |
| |
| p = ctx->in + count; |
| *p++ = 0x80; |
| count = 64 - 1 - count; |
| if (count < 8) { |
| memset(p, 0, count); |
| byteReverse(ctx->in, 16); |
| MD5Transform(ctx->buf, (uint32_t *) ctx->in); |
| memset(ctx->in, 0, 56); |
| } else { |
| memset(p, 0, count - 8); |
| } |
| byteReverse(ctx->in, 14); |
| |
| ((uint32_t *) ctx->in)[14] = ctx->bits[0]; |
| ((uint32_t *) ctx->in)[15] = ctx->bits[1]; |
| |
| MD5Transform(ctx->buf, (uint32_t *) ctx->in); |
| byteReverse((unsigned char *) ctx->buf, 4); |
| memcpy(digest, ctx->buf, 16); |
| memset((char *) ctx, 0, sizeof(*ctx)); |
| } |
| #endif // !HAVE_MD5 |
| |
| // Stringify binary data. Output buffer must be twice as big as input, |
| // because each byte takes 2 bytes in string representation |
| static void bin2str(char *to, const unsigned char *p, size_t len) { |
| static const char *hex = "0123456789abcdef"; |
| |
| for (; len--; p++) { |
| *to++ = hex[p[0] >> 4]; |
| *to++ = hex[p[0] & 0x0f]; |
| } |
| *to = '\0'; |
| } |
| |
| // Return stringified MD5 hash for list of vectors. Buffer must be 33 bytes. |
| void mg_md5(char *buf, ...) { |
| unsigned char hash[16]; |
| const char *p; |
| va_list ap; |
| MD5_CTX ctx; |
| |
| MD5Init(&ctx); |
| |
| va_start(ap, buf); |
| while ((p = va_arg(ap, const char *)) != NULL) { |
| MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p)); |
| } |
| va_end(ap); |
| |
| MD5Final(hash, &ctx); |
| bin2str(buf, hash, sizeof(hash)); |
| } |
| |
| // Check the user's password, return 1 if OK |
| static int check_password(const char *method, const char *ha1, const char *uri, |
| const char *nonce, const char *nc, const char *cnonce, |
| const char *qop, const char *response) { |
| char ha2[32 + 1], expected_response[32 + 1]; |
| |
| // Some of the parameters may be NULL |
| if (method == NULL || nonce == NULL || nc == NULL || cnonce == NULL || |
| qop == NULL || response == NULL) { |
| return 0; |
| } |
| |
| // NOTE(lsm): due to a bug in MSIE, we do not compare the URI |
| // TODO(lsm): check for authentication timeout |
| if (// strcmp(dig->uri, c->ouri) != 0 || |
| strlen(response) != 32 |
| // || now - strtoul(dig->nonce, NULL, 10) > 3600 |
| ) { |
| return 0; |
| } |
| |
| mg_md5(ha2, method, ":", uri, NULL); |
| mg_md5(expected_response, ha1, ":", nonce, ":", nc, |
| ":", cnonce, ":", qop, ":", ha2, NULL); |
| |
| return mg_strcasecmp(response, expected_response) == 0; |
| } |
| |
| // Use the global passwords file, if specified by auth_gpass option, |
| // or search for .htpasswd in the requested directory. |
| static FILE *open_auth_file(struct mg_connection *conn, const char *path) { |
| struct mg_context *ctx = conn->ctx; |
| char name[PATH_MAX]; |
| const char *p, *e; |
| struct mgstat st; |
| FILE *fp; |
| |
| if (ctx->config[GLOBAL_PASSWORDS_FILE] != NULL) { |
| // Use global passwords file |
| fp = mg_fopen(ctx->config[GLOBAL_PASSWORDS_FILE], "r"); |
| if (fp == NULL) |
| cry(fc(ctx), "fopen(%s): %s", |
| ctx->config[GLOBAL_PASSWORDS_FILE], strerror(ERRNO)); |
| } else if (!mg_stat(path, &st) && st.is_directory) { |
| (void) mg_snprintf(conn, name, sizeof(name), "%s%c%s", |
| path, DIRSEP, PASSWORDS_FILE_NAME); |
| fp = mg_fopen(name, "r"); |
| } else { |
| // Try to find .htpasswd in requested directory. |
| for (p = path, e = p + strlen(p) - 1; e > p; e--) |
| if (IS_DIRSEP_CHAR(*e)) |
| break; |
| (void) mg_snprintf(conn, name, sizeof(name), "%.*s%c%s", |
| (int) (e - p), p, DIRSEP, PASSWORDS_FILE_NAME); |
| fp = mg_fopen(name, "r"); |
| } |
| |
| return fp; |
| } |
| |
| // Parsed Authorization header |
| struct ah { |
| char *user, *uri, *cnonce, *response, *qop, *nc, *nonce; |
| }; |
| |
| static int parse_auth_header(struct mg_connection *conn, char *buf, |
| size_t buf_size, struct ah *ah) { |
| char *name, *value, *s; |
| const char *auth_header; |
| |
| if ((auth_header = mg_get_header(conn, "Authorization")) == NULL || |
| mg_strncasecmp(auth_header, "Digest ", 7) != 0) { |
| return 0; |
| } |
| |
| // Make modifiable copy of the auth header |
| (void) mg_strlcpy(buf, auth_header + 7, buf_size); |
| |
| s = buf; |
| (void) memset(ah, 0, sizeof(*ah)); |
| |
| // Parse authorization header |
| for (;;) { |
| // Gobble initial spaces |
| while (isspace(* (unsigned char *) s)) { |
| s++; |
| } |
| name = skip_quoted(&s, "=", " ", 0); |
| // Value is either quote-delimited, or ends at first comma or space. |
| if (s[0] == '\"') { |
| s++; |
| value = skip_quoted(&s, "\"", " ", '\\'); |
| if (s[0] == ',') { |
| s++; |
| } |
| } else { |
| value = skip_quoted(&s, ", ", " ", 0); // IE uses commas, FF uses spaces |
| } |
| if (*name == '\0') { |
| break; |
| } |
| |
| if (!strcmp(name, "username")) { |
| ah->user = value; |
| } else if (!strcmp(name, "cnonce")) { |
| ah->cnonce = value; |
| } else if (!strcmp(name, "response")) { |
| ah->response = value; |
| } else if (!strcmp(name, "uri")) { |
| ah->uri = value; |
| } else if (!strcmp(name, "qop")) { |
| ah->qop = value; |
| } else if (!strcmp(name, "nc")) { |
| ah->nc = value; |
| } else if (!strcmp(name, "nonce")) { |
| ah->nonce = value; |
| } |
| } |
| |
| // CGI needs it as REMOTE_USER |
| if (ah->user != NULL) { |
| conn->request_info.remote_user = mg_strdup(ah->user); |
| } else { |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| // Authorize against the opened passwords file. Return 1 if authorized. |
| static int authorize(struct mg_connection *conn, FILE *fp) { |
| struct ah ah; |
| char line[256], f_user[256], ha1[256], f_domain[256], buf[BUFSIZ]; |
| |
| if (!parse_auth_header(conn, buf, sizeof(buf), &ah)) { |
| return 0; |
| } |
| |
| // Loop over passwords file |
| while (fgets(line, sizeof(line), fp) != NULL) { |
| if (sscanf(line, "%[^:]:%[^:]:%s", f_user, f_domain, ha1) != 3) { |
| continue; |
| } |
| |
| if (!strcmp(ah.user, f_user) && |
| !strcmp(conn->ctx->config[AUTHENTICATION_DOMAIN], f_domain)) |
| return check_password( |
| conn->request_info.request_method, |
| ha1, ah.uri, ah.nonce, ah.nc, ah.cnonce, ah.qop, |
| ah.response); |
| } |
| |
| return 0; |
| } |
| |
| // Return 1 if request is authorised, 0 otherwise. |
| static int check_authorization(struct mg_connection *conn, const char *path) { |
| FILE *fp; |
| char fname[PATH_MAX]; |
| struct vec uri_vec, filename_vec; |
| const char *list; |
| int authorized; |
| |
| fp = NULL; |
| authorized = 1; |
| |
| list = conn->ctx->config[PROTECT_URI]; |
| while ((list = next_option(list, &uri_vec, &filename_vec)) != NULL) { |
| if (!memcmp(conn->request_info.uri, uri_vec.ptr, uri_vec.len)) { |
| (void) mg_snprintf(conn, fname, sizeof(fname), "%.*s", |
| filename_vec.len, filename_vec.ptr); |
| if ((fp = mg_fopen(fname, "r")) == NULL) { |
| cry(conn, "%s: cannot open %s: %s", __func__, fname, strerror(errno)); |
| } |
| break; |
| } |
| } |
| |
| if (fp == NULL) { |
| fp = open_auth_file(conn, path); |
| } |
| |
| if (fp != NULL) { |
| authorized = authorize(conn, fp); |
| (void) fclose(fp); |
| } |
| |
| return authorized; |
| } |
| |
| static void send_authorization_request(struct mg_connection *conn) { |
| conn->request_info.status_code = 401; |
| (void) mg_printf(conn, |
| "HTTP/1.1 401 Unauthorized\r\n" |
| "Content-Length: 0\r\n" |
| "WWW-Authenticate: Digest qop=\"auth\", " |
| "realm=\"%s\", nonce=\"%lu\"\r\n\r\n", |
| conn->ctx->config[AUTHENTICATION_DOMAIN], |
| (unsigned long) time(NULL)); |
| } |
| |
| static int is_authorized_for_put(struct mg_connection *conn) { |
| FILE *fp; |
| int ret = 0; |
| |
| fp = conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL ? NULL : |
| mg_fopen(conn->ctx->config[PUT_DELETE_PASSWORDS_FILE], "r"); |
| |
| if (fp != NULL) { |
| ret = authorize(conn, fp); |
| (void) fclose(fp); |
| } |
| |
| return ret; |
| } |
| |
| int mg_modify_passwords_file(const char *fname, const char *domain, |
| const char *user, const char *pass) { |
| int found; |
| char line[512], u[512], d[512], ha1[33], tmp[PATH_MAX]; |
| FILE *fp, *fp2; |
| |
| found = 0; |
| fp = fp2 = NULL; |
| |
| // Regard empty password as no password - remove user record. |
| if (pass != NULL && pass[0] == '\0') { |
| pass = NULL; |
| } |
| |
| (void) snprintf(tmp, sizeof(tmp), "%s.tmp", fname); |
| |
| // Create the file if does not exist |
| if ((fp = mg_fopen(fname, "a+")) != NULL) { |
| (void) fclose(fp); |
| } |
| |
| // Open the given file and temporary file |
| if ((fp = mg_fopen(fname, "r")) == NULL) { |
| return 0; |
| } else if ((fp2 = mg_fopen(tmp, "w+")) == NULL) { |
| fclose(fp); |
| return 0; |
| } |
| |
| // Copy the stuff to temporary file |
| while (fgets(line, sizeof(line), fp) != NULL) { |
| if (sscanf(line, "%[^:]:%[^:]:%*s", u, d) != 2) { |
| continue; |
| } |
| |
| if (!strcmp(u, user) && !strcmp(d, domain)) { |
| found++; |
| if (pass != NULL) { |
| mg_md5(ha1, user, ":", domain, ":", pass, NULL); |
| fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); |
| } |
| } else { |
| (void) fprintf(fp2, "%s", line); |
| } |
| } |
| |
| // If new user, just add it |
| if (!found && pass != NULL) { |
| mg_md5(ha1, user, ":", domain, ":", pass, NULL); |
| (void) fprintf(fp2, "%s:%s:%s\n", user, domain, ha1); |
| } |
| |
| // Close files |
| (void) fclose(fp); |
| (void) fclose(fp2); |
| |
| // Put the temp file in place of real file |
| (void) mg_remove(fname); |
| (void) mg_rename(tmp, fname); |
| |
| return 1; |
| } |
| |
| struct de { |
| struct mg_connection *conn; |
| char *file_name; |
| struct mgstat st; |
| }; |
| |
| static void url_encode(const char *src, char *dst, size_t dst_len) { |
| static const char *dont_escape = "._-$,;~()"; |
| static const char *hex = "0123456789abcdef"; |
| const char *end = dst + dst_len - 1; |
| |
| for (; *src != '\0' && dst < end; src++, dst++) { |
| if (isalnum(*(const unsigned char *) src) || |
| strchr(dont_escape, * (const unsigned char *) src) != NULL) { |
| *dst = *src; |
| } else if (dst + 2 < end) { |
| dst[0] = '%'; |
| dst[1] = hex[(* (const unsigned char *) src) >> 4]; |
| dst[2] = hex[(* (const unsigned char *) src) & 0xf]; |
| dst += 2; |
| } |
| } |
| |
| *dst = '\0'; |
| } |
| |
| static void print_dir_entry(struct de *de) { |
| char size[64], mod[64], href[PATH_MAX]; |
| |
| if (de->st.is_directory) { |
| (void) mg_snprintf(de->conn, size, sizeof(size), "%s", "[DIRECTORY]"); |
| } else { |
| // We use (signed) cast below because MSVC 6 compiler cannot |
| // convert unsigned __int64 to double. Sigh. |
| if (de->st.size < 1024) { |
| (void) mg_snprintf(de->conn, size, sizeof(size), |
| "%lu", (unsigned long) de->st.size); |
| } else if (de->st.size < 1024 * 1024) { |
| (void) mg_snprintf(de->conn, size, sizeof(size), |
| "%.1fk", (double) de->st.size / 1024.0); |
| } else if (de->st.size < 1024 * 1024 * 1024) { |
| (void) mg_snprintf(de->conn, size, sizeof(size), |
| "%.1fM", (double) de->st.size / 1048576); |
| } else { |
| (void) mg_snprintf(de->conn, size, sizeof(size), |
| "%.1fG", (double) de->st.size / 1073741824); |
| } |
| } |
| (void) strftime(mod, sizeof(mod), "%d-%b-%Y %H:%M", localtime(&de->st.mtime)); |
| url_encode(de->file_name, href, sizeof(href)); |
| de->conn->num_bytes_sent += mg_printf(de->conn, |
| "<tr><td><a href=\"%s%s%s\">%s%s</a></td>" |
| "<td> %s</td><td> %s</td></tr>\n", |
| de->conn->request_info.uri, href, de->st.is_directory ? "/" : "", |
| de->file_name, de->st.is_directory ? "/" : "", mod, size); |
| } |
| |
| // This function is called from send_directory() and used for |
| // sorting directory entries by size, or name, or modification time. |
| // On windows, __cdecl specification is needed in case if project is built |
| // with __stdcall convention. qsort always requires __cdels callback. |
| static int WINCDECL compare_dir_entries(const void *p1, const void *p2) { |
| const struct de *a = (const struct de *) p1, *b = (const struct de *) p2; |
| const char *query_string = a->conn->request_info.query_string; |
| int cmp_result = 0; |
| |
| if (query_string == NULL) { |
| query_string = "na"; |
| } |
| |
| if (a->st.is_directory && !b->st.is_directory) { |
| return -1; // Always put directories on top |
| } else if (!a->st.is_directory && b->st.is_directory) { |
| return 1; // Always put directories on top |
| } else if (*query_string == 'n') { |
| cmp_result = strcmp(a->file_name, b->file_name); |
| } else if (*query_string == 's') { |
| cmp_result = a->st.size == b->st.size ? 0 : |
| a->st.size > b->st.size ? 1 : -1; |
| } else if (*query_string == 'd') { |
| cmp_result = a->st.mtime == b->st.mtime ? 0 : |
| a->st.mtime > b->st.mtime ? 1 : -1; |
| } |
| |
| return query_string[1] == 'd' ? -cmp_result : cmp_result; |
| } |
| |
| static int scan_directory(struct mg_connection *conn, const char *dir, |
| void *data, void (*cb)(struct de *, void *)) { |
| char path[PATH_MAX]; |
| struct dirent *dp; |
| DIR *dirp; |
| struct de de; |
| |
| if ((dirp = opendir(dir)) == NULL) { |
| return 0; |
| } else { |
| de.conn = conn; |
| |
| while ((dp = readdir(dirp)) != NULL) { |
| // Do not show current dir and passwords file |
| if (!strcmp(dp->d_name, ".") || |
| !strcmp(dp->d_name, "..") || |
| !strcmp(dp->d_name, PASSWORDS_FILE_NAME)) |
| continue; |
| |
| mg_snprintf(conn, path, sizeof(path), "%s%c%s", dir, DIRSEP, dp->d_name); |
| |
| // If we don't memset stat structure to zero, mtime will have |
| // garbage and strftime() will segfault later on in |
| // print_dir_entry(). memset is required only if mg_stat() |
| // fails. For more details, see |
| // http://code.google.com/p/mongoose/issues/detail?id=79 |
| if (mg_stat(path, &de.st) != 0) { |
| memset(&de.st, 0, sizeof(de.st)); |
| } |
| de.file_name = dp->d_name; |
| |
| cb(&de, data); |
| } |
| (void) closedir(dirp); |
| } |
| return 1; |
| } |
| |
| struct dir_scan_data { |
| struct de *entries; |
| int num_entries; |
| int arr_size; |
| }; |
| |
| static void dir_scan_callback(struct de *de, void *data) { |
| struct dir_scan_data *dsd = (struct dir_scan_data *) data; |
| |
| if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) { |
| dsd->arr_size *= 2; |
| dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size * |
| sizeof(dsd->entries[0])); |
| } |
| if (dsd->entries == NULL) { |
| // TODO(lsm): propagate an error to the caller |
| dsd->num_entries = 0; |
| } else { |
| dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name); |
| dsd->entries[dsd->num_entries].st = de->st; |
| dsd->entries[dsd->num_entries].conn = de->conn; |
| dsd->num_entries++; |
| } |
| } |
| |
| static void handle_directory_request(struct mg_connection *conn, |
| const char *dir) { |
| int i, sort_direction; |
| struct dir_scan_data data = { NULL, 0, 128 }; |
| |
| if (!scan_directory(conn, dir, &data, dir_scan_callback)) { |
| send_http_error(conn, 500, "Cannot open directory", |
| "Error: opendir(%s): %s", dir, strerror(ERRNO)); |
| return; |
| } |
| |
| sort_direction = conn->request_info.query_string != NULL && |
| conn->request_info.query_string[1] == 'd' ? 'a' : 'd'; |
| |
| mg_printf(conn, "%s", |
| "HTTP/1.1 200 OK\r\n" |
| "Connection: close\r\n" |
| "Content-Type: text/html; charset=utf-8\r\n\r\n"); |
| |
| conn->num_bytes_sent += mg_printf(conn, |
| "<html><head><title>Index of %s</title>" |
| "<style>th {text-align: left;}</style></head>" |
| "<body><h1>Index of %s</h1><pre><table cellpadding=\"0\">" |
| "<tr><th><a href=\"?n%c\">Name</a></th>" |
| "<th><a href=\"?d%c\">Modified</a></th>" |
| "<th><a href=\"?s%c\">Size</a></th></tr>" |
| "<tr><td colspan=\"3\"><hr></td></tr>", |
| conn->request_info.uri, conn->request_info.uri, |
| sort_direction, sort_direction, sort_direction); |
| |
| // Print first entry - link to a parent directory |
| conn->num_bytes_sent += mg_printf(conn, |
| "<tr><td><a href=\"%s%s\">%s</a></td>" |
| "<td> %s</td><td> %s</td></tr>\n", |
| conn->request_info.uri, "..", "Parent directory", "-", "-"); |
| |
| // Sort and print directory entries |
| qsort(data.entries, (size_t) data.num_entries, sizeof(data.entries[0]), |
| compare_dir_entries); |
| for (i = 0; i < data.num_entries; i++) { |
| print_dir_entry(&data.entries[i]); |
| free(data.entries[i].file_name); |
| } |
| free(data.entries); |
| |
| conn->num_bytes_sent += mg_printf(conn, "%s", "</table></body></html>"); |
| conn->request_info.status_code = 200; |
| } |
| |
| // Send len bytes from the opened file to the client. |
| static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) { |
| char buf[BUFSIZ]; |
| int to_read, num_read, num_written; |
| |
| while (len > 0) { |
| // Calculate how much to read from the file in the buffer |
| to_read = sizeof(buf); |
| if ((int64_t) to_read > len) |
| to_read = (int) len; |
| |
| // Read from file, exit the loop on error |
| if ((num_read = fread(buf, 1, (size_t)to_read, fp)) == 0) |
| break; |
| |
| // Send read bytes to the client, exit the loop on error |
| if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read) |
| break; |
| |
| // Both read and were successful, adjust counters |
| conn->num_bytes_sent += num_written; |
| len -= num_written; |
| } |
| } |
| |
| static int parse_range_header(const char *header, int64_t *a, int64_t *b) { |
| return sscanf(header, "bytes=%" INT64_FMT "-%" INT64_FMT, a, b); |
| } |
| |
| static void gmt_time_string(char *buf, size_t buf_len, time_t *t) { |
| strftime(buf, buf_len, "%a, %d %b %Y %H:%M:%S GMT", gmtime(t)); |
| } |
| |
| static void handle_file_request(struct mg_connection *conn, const char *path, |
| struct mgstat *stp) { |
| char date[64], lm[64], etag[64], range[64]; |
| const char *msg = "OK", *hdr; |
| time_t curtime = time(NULL); |
| int64_t cl, r1, r2; |
| struct vec mime_vec; |
| FILE *fp; |
| int n; |
| |
| get_mime_type(conn->ctx, path, &mime_vec); |
| cl = stp->size; |
| conn->request_info.status_code = 200; |
| range[0] = '\0'; |
| |
| if ((fp = mg_fopen(path, "rb")) == NULL) { |
| send_http_error(conn, 500, http_500_error, |
| "fopen(%s): %s", path, strerror(ERRNO)); |
| return; |
| } |
| set_close_on_exec(fileno(fp)); |
| |
| // If Range: header specified, act accordingly |
| r1 = r2 = 0; |
| hdr = mg_get_header(conn, "Range"); |
| if (hdr != NULL && (n = parse_range_header(hdr, &r1, &r2)) > 0) { |
| conn->request_info.status_code = 206; |
| (void) fseeko(fp, (off_t) r1, SEEK_SET); |
| cl = n == 2 ? r2 - r1 + 1: cl - r1; |
| (void) mg_snprintf(conn, range, sizeof(range), |
| "Content-Range: bytes " |
| "%" INT64_FMT "-%" |
| INT64_FMT "/%" INT64_FMT "\r\n", |
| r1, r1 + cl - 1, stp->size); |
| msg = "Partial Content"; |
| } |
| |
| // Prepare Etag, Date, Last-Modified headers. Must be in UTC, according to |
| // http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.3 |
| gmt_time_string(date, sizeof(date), &curtime); |
| gmt_time_string(lm, sizeof(lm), &stp->mtime); |
| (void) mg_snprintf(conn, etag, sizeof(etag), "%lx.%lx", |
| (unsigned long) stp->mtime, (unsigned long) stp->size); |
| |
| (void) mg_printf(conn, |
| "HTTP/1.1 %d %s\r\n" |
| "Date: %s\r\n" |
| "Last-Modified: %s\r\n" |
| "Etag: \"%s\"\r\n" |
| "Content-Type: %.*s\r\n" |
| "Content-Length: %" INT64_FMT "\r\n" |
| "Connection: %s\r\n" |
| "Accept-Ranges: bytes\r\n" |
| "%s\r\n", |
| conn->request_info.status_code, msg, date, lm, etag, |
| mime_vec.len, mime_vec.ptr, cl, suggest_connection_header(conn), range); |
| |
| if (strcmp(conn->request_info.request_method, "HEAD") != 0) { |
| send_file_data(conn, fp, cl); |
| } |
| (void) fclose(fp); |
| } |
| |
| void mg_send_file(struct mg_connection *conn, const char *path) { |
| struct mgstat st; |
| if (mg_stat(path, &st) == 0) { |
| handle_file_request(conn, path, &st); |
| } else { |
| send_http_error(conn, 404, "Not Found", "%s", "File not found"); |
| } |
| } |
| |
| |
| // Parse HTTP headers from the given buffer, advance buffer to the point |
| // where parsing stopped. |
| static void parse_http_headers(char **buf, struct mg_request_info *ri) { |
| int i; |
| |
| for (i = 0; i < (int) ARRAY_SIZE(ri->http_headers); i++) { |
| ri->http_headers[i].name = skip_quoted(buf, ":", " ", 0); |
| ri->http_headers[i].value = skip(buf, "\r\n"); |
| if (ri->http_headers[i].name[0] == '\0') |
| break; |
| ri->num_headers = i + 1; |
| } |
| } |
| |
| static int is_valid_http_method(const char *method) { |
| return !strcmp(method, "GET") || !strcmp(method, "POST") || |
| !strcmp(method, "HEAD") || !strcmp(method, "CONNECT") || |
| !strcmp(method, "PUT") || !strcmp(method, "DELETE") || |
| !strcmp(method, "OPTIONS") || !strcmp(method, "PROPFIND"); |
| } |
| |
| // Parse HTTP request, fill in mg_request_info structure. |
| static int parse_http_request(char *buf, struct mg_request_info *ri) { |
| int status = 0; |
| |
| // RFC says that all initial whitespaces should be ingored |
| while (*buf != '\0' && isspace(* (unsigned char *) buf)) { |
| buf++; |
| } |
| |
| ri->request_method = skip(&buf, " "); |
| ri->uri = skip(&buf, " "); |
| ri->http_version = skip(&buf, "\r\n"); |
| |
| if (is_valid_http_method(ri->request_method) && |
| strncmp(ri->http_version, "HTTP/", 5) == 0) { |
| ri->http_version += 5; // Skip "HTTP/" |
| parse_http_headers(&buf, ri); |
| status = 1; |
| } |
| |
| return status; |
| } |
| |
| // Keep reading the input (either opened file descriptor fd, or socket sock, |
| // or SSL descriptor ssl) into buffer buf, until \r\n\r\n appears in the |
| // buffer (which marks the end of HTTP request). Buffer buf may already |
| // have some data. The length of the data is stored in nread. |
| // Upon every read operation, increase nread by the number of bytes read. |
| static int read_request(FILE *fp, SOCKET sock, SSL *ssl, char *buf, int bufsiz, |
| int *nread) { |
| int n, request_len; |
| |
| request_len = 0; |
| while (*nread < bufsiz && request_len == 0) { |
| n = pull(fp, sock, ssl, buf + *nread, bufsiz - *nread); |
| if (n <= 0) { |
| break; |
| } else { |
| *nread += n; |
| request_len = get_request_len(buf, *nread); |
| } |
| } |
| |
| return request_len; |
| } |
| |
| // For given directory path, substitute it to valid index file. |
| // Return 0 if index file has been found, -1 if not found. |
| // If the file is found, it's stats is returned in stp. |
| static int substitute_index_file(struct mg_connection *conn, char *path, |
| size_t path_len, struct mgstat *stp) { |
| const char *list = conn->ctx->config[INDEX_FILES]; |
| struct mgstat st; |
| struct vec filename_vec; |
| size_t n = strlen(path); |
| int found = 0; |
| |
| // The 'path' given to us points to the directory. Remove all trailing |
| // directory separator characters from the end of the path, and |
| // then append single directory separator character. |
| while (n > 0 && IS_DIRSEP_CHAR(path[n - 1])) { |
| n--; |
| } |
| path[n] = DIRSEP; |
| |
| // Traverse index files list. For each entry, append it to the given |
| // path and see if the file exists. If it exists, break the loop |
| while ((list = next_option(list, &filename_vec, NULL)) != NULL) { |
| |
| // Ignore too long entries that may overflow path buffer |
| if (filename_vec.len > path_len - n) |
| continue; |
| |
| // Prepare full path to the index file |
| (void) mg_strlcpy(path + n + 1, filename_vec.ptr, filename_vec.len + 1); |
| |
| // Does it exist? |
| if (mg_stat(path, &st) == 0) { |
| // Yes it does, break the loop |
| *stp = st; |
| found = 1; |
| break; |
| } |
| } |
| |
| // If no index file exists, restore directory path |
| if (!found) { |
| path[n] = '\0'; |
| } |
| |
| return found; |
| } |
| |
| // Return True if we should reply 304 Not Modified. |
| static int is_not_modified(const struct mg_connection *conn, |
| const struct mgstat *stp) { |
| const char *ims = mg_get_header(conn, "If-Modified-Since"); |
| return ims != NULL && stp->mtime <= parse_date_string(ims); |
| } |
| |
| static int forward_body_data(struct mg_connection *conn, FILE *fp, |
| SOCKET sock, SSL *ssl) { |
| const char *expect, *buffered; |
| char buf[BUFSIZ]; |
| int to_read, nread, buffered_len, success = 0; |
| |
| expect = mg_get_header(conn, "Expect"); |
| assert(fp != NULL); |
| |
| if (conn->content_len == -1) { |
| send_http_error(conn, 411, "Length Required", ""); |
| } else if (expect != NULL && mg_strcasecmp(expect, "100-continue")) { |
| send_http_error(conn, 417, "Expectation Failed", ""); |
| } else { |
| if (expect != NULL) { |
| (void) mg_printf(conn, "%s", "HTTP/1.1 100 Continue\r\n\r\n"); |
| } |
| |
| buffered = conn->buf + conn->request_len; |
| buffered_len = conn->data_len - conn->request_len; |
| assert(buffered_len >= 0); |
| assert(conn->consumed_content == 0); |
| |
| if (buffered_len > 0) { |
| if ((int64_t) buffered_len > conn->content_len) { |
| buffered_len = (int) conn->content_len; |
| } |
| push(fp, sock, ssl, buffered, (int64_t) buffered_len); |
| conn->consumed_content += buffered_len; |
| } |
| |
| while (conn->consumed_content < conn->content_len) { |
| to_read = sizeof(buf); |
| if ((int64_t) to_read > conn->content_len - conn->consumed_content) { |
| to_read = (int) (conn->content_len - conn->consumed_content); |
| } |
| nread = pull(NULL, conn->client.sock, conn->ssl, buf, to_read); |
| if (nread <= 0 || push(fp, sock, ssl, buf, nread) != nread) { |
| break; |
| } |
| conn->consumed_content += nread; |
| } |
| |
| if (conn->consumed_content == conn->content_len) { |
| success = 1; |
| } |
| |
| // Each error code path in this function must send an error |
| if (!success) { |
| send_http_error(conn, 577, http_500_error, ""); |
| } |
| } |
| |
| return success; |
| } |
| |
| #if !defined(NO_CGI) |
| // This structure helps to create an environment for the spawned CGI program. |
| // Environment is an array of "VARIABLE=VALUE\0" ASCIIZ strings, |
| // last element must be NULL. |
| // However, on Windows there is a requirement that all these VARIABLE=VALUE\0 |
| // strings must reside in a contiguous buffer. The end of the buffer is |
| // marked by two '\0' characters. |
| // We satisfy both worlds: we create an envp array (which is vars), all |
| // entries are actually pointers inside buf. |
| struct cgi_env_block { |
| struct mg_connection *conn; |
| char buf[CGI_ENVIRONMENT_SIZE]; // Environment buffer |
| int len; // Space taken |
| char *vars[MAX_CGI_ENVIR_VARS]; // char **envp |
| int nvars; // Number of variables |
| }; |
| |
| // Append VARIABLE=VALUE\0 string to the buffer, and add a respective |
| // pointer into the vars array. |
| static char *addenv(struct cgi_env_block *block, const char *fmt, ...) { |
| int n, space; |
| char *added; |
| va_list ap; |
| |
| // Calculate how much space is left in the buffer |
| space = sizeof(block->buf) - block->len - 2; |
| assert(space >= 0); |
| |
| // Make a pointer to the free space int the buffer |
| added = block->buf + block->len; |
| |
| // Copy VARIABLE=VALUE\0 string into the free space |
| va_start(ap, fmt); |
| n = mg_vsnprintf(block->conn, added, (size_t) space, fmt, ap); |
| va_end(ap); |
| |
| // Make sure we do not overflow buffer and the envp array |
| if (n > 0 && n < space && |
| block->nvars < (int) ARRAY_SIZE(block->vars) - 2) { |
| // Append a pointer to the added string into the envp array |
| block->vars[block->nvars++] = block->buf + block->len; |
| // Bump up used length counter. Include \0 terminator |
| block->len += n + 1; |
| } |
| |
| return added; |
| } |
| |
| static void prepare_cgi_environment(struct mg_connection *conn, |
| const char *prog, |
| struct cgi_env_block *blk) { |
| const char *s, *slash; |
| struct vec var_vec, root; |
| char *p; |
| int i; |
| |
| blk->len = blk->nvars = 0; |
| blk->conn = conn; |
| |
| memset(&root, 0, sizeof(root)); |
| |
| get_document_root(conn, &root); |
| |
| addenv(blk, "SERVER_NAME=%s", conn->ctx->config[AUTHENTICATION_DOMAIN]); |
| addenv(blk, "SERVER_ROOT=%.*s", root.len, root.ptr); |
| addenv(blk, "DOCUMENT_ROOT=%.*s", root.len, root.ptr); |
| |
| // Prepare the environment block |
| addenv(blk, "%s", "GATEWAY_INTERFACE=CGI/1.1"); |
| addenv(blk, "%s", "SERVER_PROTOCOL=HTTP/1.1"); |
| addenv(blk, "%s", "REDIRECT_STATUS=200"); // For PHP |
| addenv(blk, "SERVER_PORT=%d", ntohs(conn->client.lsa.u.sin.sin_port)); |
| addenv(blk, "REQUEST_METHOD=%s", conn->request_info.request_method); |
| addenv(blk, "REMOTE_ADDR=%s", |
| inet_ntoa(conn->client.rsa.u.sin.sin_addr)); |
| addenv(blk, "REMOTE_PORT=%d", conn->request_info.remote_port); |
| addenv(blk, "REQUEST_URI=%s", conn->request_info.uri); |
| |
| // SCRIPT_NAME |
| assert(conn->request_info.uri[0] == '/'); |
| slash = strrchr(conn->request_info.uri, '/'); |
| if ((s = strrchr(prog, '/')) == NULL) |
| s = prog; |
| addenv(blk, "SCRIPT_NAME=%.*s%s", slash - conn->request_info.uri, |
| conn->request_info.uri, s); |
| |
| addenv(blk, "SCRIPT_FILENAME=%s", prog); |
| addenv(blk, "PATH_TRANSLATED=%s", prog); |
| addenv(blk, "HTTPS=%s", conn->ssl == NULL ? "off" : "on"); |
| |
| if ((s = mg_get_header(conn, "Content-Type")) != NULL) |
| addenv(blk, "CONTENT_TYPE=%s", s); |
| |
| if (conn->request_info.query_string != NULL) |
| addenv(blk, "QUERY_STRING=%s", conn->request_info.query_string); |
| |
| if ((s = mg_get_header(conn, "Content-Length")) != NULL) |
| addenv(blk, "CONTENT_LENGTH=%s", s); |
| |
| if ((s = getenv("PATH")) != NULL) |
| addenv(blk, "PATH=%s", s); |
| |
| #if defined(_WIN32) |
| if ((s = getenv("COMSPEC")) != NULL) |
| addenv(blk, "COMSPEC=%s", s); |
| if ((s = getenv("SYSTEMROOT")) != NULL) |
| addenv(blk, "SYSTEMROOT=%s", s); |
| #else |
| if ((s = getenv("LD_LIBRARY_PATH")) != NULL) |
| addenv(blk, "LD_LIBRARY_PATH=%s", s); |
| #endif // _WIN32 |
| |
| if ((s = getenv("PERLLIB")) != NULL) |
| addenv(blk, "PERLLIB=%s", s); |
| |
| if (conn->request_info.remote_user != NULL) { |
| addenv(blk, "REMOTE_USER=%s", conn->request_info.remote_user); |
| addenv(blk, "%s", "AUTH_TYPE=Digest"); |
| } |
| |
| // Add all headers as HTTP_* variables |
| for (i = 0; i < conn->request_info.num_headers; i++) { |
| p = addenv(blk, "HTTP_%s=%s", |
| conn->request_info.http_headers[i].name, |
| conn->request_info.http_headers[i].value); |
| |
| // Convert variable name into uppercase, and change - to _ |
| for (; *p != '=' && *p != '\0'; p++) { |
| if (*p == '-') |
| *p = '_'; |
| *p = (char) toupper(* (unsigned char *) p); |
| } |
| } |
| |
| // Add user-specified variables |
| s = conn->ctx->config[CGI_ENVIRONMENT]; |
| while ((s = next_option(s, &var_vec, NULL)) != NULL) { |
| addenv(blk, "%.*s", var_vec.len, var_vec.ptr); |
| } |
| |
| blk->vars[blk->nvars++] = NULL; |
| blk->buf[blk->len++] = '\0'; |
| |
| assert(blk->nvars < (int) ARRAY_SIZE(blk->vars)); |
| assert(blk->len > 0); |
| assert(blk->len < (int) sizeof(blk->buf)); |
| } |
| |
| static void handle_cgi_request(struct mg_connection *conn, const char *prog) { |
| int headers_len, data_len, i, fd_stdin[2], fd_stdout[2]; |
| const char *status; |
| char buf[BUFSIZ], *pbuf, dir[PATH_MAX], *p; |
| struct mg_request_info ri; |
| struct cgi_env_block blk; |
| FILE *in, *out; |
| pid_t pid; |
| |
| memset(&ri, 0, sizeof(ri)); |
| |
| prepare_cgi_environment(conn, prog, &blk); |
| |
| // CGI must be executed in its own directory. 'dir' must point to the |
| // directory containing executable program, 'p' must point to the |
| // executable program name relative to 'dir'. |
| (void) mg_snprintf(conn, dir, sizeof(dir), "%s", prog); |
| if ((p = strrchr(dir, DIRSEP)) != NULL) { |
| *p++ = '\0'; |
| } else { |
| dir[0] = '.', dir[1] = '\0'; |
| p = (char *) prog; |
| } |
| |
| pid = (pid_t) -1; |
| fd_stdin[0] = fd_stdin[1] = fd_stdout[0] = fd_stdout[1] = -1; |
| in = out = NULL; |
| |
| if (pipe(fd_stdin) != 0 || pipe(fd_stdout) != 0) { |
| send_http_error(conn, 500, http_500_error, |
| "Cannot create CGI pipe: %s", strerror(ERRNO)); |
| goto done; |
| } else if ((pid = spawn_process(conn, p, blk.buf, blk.vars, |
| fd_stdin[0], fd_stdout[1], dir)) == (pid_t) -1) { |
| goto done; |
| } else if ((in = fdopen(fd_stdin[1], "wb")) == NULL || |
| (out = fdopen(fd_stdout[0], "rb")) == NULL) { |
| send_http_error(conn, 500, http_500_error, |
| "fopen: %s", strerror(ERRNO)); |
| goto done; |
| } |
| |
| setbuf(in, NULL); |
| setbuf(out, NULL); |
| |
| // spawn_process() must close those! |
| // If we don't mark them as closed, close() attempt before |
| // return from this function throws an exception on Windows. |
| // Windows does not like when closed descriptor is closed again. |
| fd_stdin[0] = fd_stdout[1] = -1; |
| |
| // Send POST data to the CGI process if needed |
| if (!strcmp(conn->request_info.request_method, "POST") && |
| !forward_body_data(conn, in, INVALID_SOCKET, NULL)) { |
| goto done; |
| } |
| |
| // Now read CGI reply into a buffer. We need to set correct |
| // status code, thus we need to see all HTTP headers first. |
| // Do not send anything back to client, until we buffer in all |
| // HTTP headers. |
| data_len = 0; |
| headers_len = read_request(out, INVALID_SOCKET, NULL, |
| buf, sizeof(buf), &data_len); |
| if (headers_len <= 0) { |
| send_http_error(conn, 500, http_500_error, |
| "CGI program sent malformed HTTP headers: [%.*s]", |
| data_len, buf); |
| goto done; |
| } |
| pbuf = buf; |
| buf[headers_len - 1] = '\0'; |
| parse_http_headers(&pbuf, &ri); |
| |
| // Make up and send the status line |
| status = get_header(&ri, "Status"); |
| conn->request_info.status_code = status == NULL ? 200 : atoi(status); |
| (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n", conn->request_info.status_code); |
| |
| // Send headers |
| for (i = 0; i < ri.num_headers; i++) { |
| mg_printf(conn, "%s: %s\r\n", |
| ri.http_headers[i].name, ri.http_headers[i].value); |
| } |
| (void) mg_write(conn, "\r\n", 2); |
| |
| // Send chunk of data that may be read after the headers |
| conn->num_bytes_sent += mg_write(conn, buf + headers_len, |
| (size_t)(data_len - headers_len)); |
| |
| // Read the rest of CGI output and send to the client |
| send_file_data(conn, out, INT64_MAX); |
| |
| done: |
| if (pid != (pid_t) -1) { |
| kill(pid, SIGKILL); |
| } |
| if (fd_stdin[0] != -1) { |
| (void) close(fd_stdin[0]); |
| } |
| if (fd_stdout[1] != -1) { |
| (void) close(fd_stdout[1]); |
| } |
| |
| if (in != NULL) { |
| (void) fclose(in); |
| } else if (fd_stdin[1] != -1) { |
| (void) close(fd_stdin[1]); |
| } |
| |
| if (out != NULL) { |
| (void) fclose(out); |
| } else if (fd_stdout[0] != -1) { |
| (void) close(fd_stdout[0]); |
| } |
| } |
| #endif // !NO_CGI |
| |
| // For a given PUT path, create all intermediate subdirectories |
| // for given path. Return 0 if the path itself is a directory, |
| // or -1 on error, 1 if OK. |
| static int put_dir(const char *path) { |
| char buf[PATH_MAX]; |
| const char *s, *p; |
| struct mgstat st; |
| int len, res = 1; |
| |
| for (s = p = path + 2; (p = strchr(s, DIRSEP)) != NULL; s = ++p) { |
| len = p - path; |
| if (len >= (int) sizeof(buf)) { |
| res = -1; |
| break; |
| } |
| memcpy(buf, path, len); |
| buf[len] = '\0'; |
| |
| // Try to create intermediate directory |
| DEBUG_TRACE(("mkdir(%s)", buf)); |
| if (mg_stat(buf, &st) == -1 && mg_mkdir(buf, 0755) != 0) { |
| res = -1; |
| break; |
| } |
| |
| // Is path itself a directory? |
| if (p[1] == '\0') { |
| res = 0; |
| } |
| } |
| |
| return res; |
| } |
| |
| static void put_file(struct mg_connection *conn, const char *path) { |
| struct mgstat st; |
| const char *range; |
| int64_t r1, r2; |
| FILE *fp; |
| int rc; |
| |
| conn->request_info.status_code = mg_stat(path, &st) == 0 ? 200 : 201; |
| |
| if ((rc = put_dir(path)) == 0) { |
| mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", conn->request_info.status_code); |
| } else if (rc == -1) { |
| send_http_error(conn, 500, http_500_error, |
| "put_dir(%s): %s", path, strerror(ERRNO)); |
| } else if ((fp = mg_fopen(path, "wb+")) == NULL) { |
| send_http_error(conn, 500, http_500_error, |
| "fopen(%s): %s", path, strerror(ERRNO)); |
| } else { |
| set_close_on_exec(fileno(fp)); |
| range = mg_get_header(conn, "Content-Range"); |
| r1 = r2 = 0; |
| if (range != NULL && parse_range_header(range, &r1, &r2) > 0) { |
| conn->request_info.status_code = 206; |
| // TODO(lsm): handle seek error |
| (void) fseeko(fp, (off_t) r1, SEEK_SET); |
| } |
| if (forward_body_data(conn, fp, INVALID_SOCKET, NULL)) |
| (void) mg_printf(conn, "HTTP/1.1 %d OK\r\n\r\n", |
| conn->request_info.status_code); |
| (void) fclose(fp); |
| } |
| } |
| |
| static void send_ssi_file(struct mg_connection *, const char *, FILE *, int); |
| |
| static void do_ssi_include(struct mg_connection *conn, const char *ssi, |
| char *tag, int include_level) { |
| char file_name[BUFSIZ], path[PATH_MAX], *p; |
| struct vec root; |
| int is_ssi; |
| FILE *fp; |
| |
| get_document_root(conn, &root); |
| |
| // sscanf() is safe here, since send_ssi_file() also uses buffer |
| // of size BUFSIZ to get the tag. So strlen(tag) is always < BUFSIZ. |
| if (sscanf(tag, " virtual=\"%[^\"]\"", file_name) == 1) { |
| // File name is relative to the webserver root |
| (void) mg_snprintf(conn, path, sizeof(path), "%.*s%c%s", |
| root.len, root.ptr, DIRSEP, file_name); |
| } else if (sscanf(tag, " file=\"%[^\"]\"", file_name) == 1) { |
| // File name is relative to the webserver working directory |
| // or it is absolute system path |
| (void) mg_snprintf(conn, path, sizeof(path), "%s", file_name); |
| } else if (sscanf(tag, " \"%[^\"]\"", file_name) == 1) { |
| // File name is relative to the currect document |
| (void) mg_snprintf(conn, path, sizeof(path), "%s", ssi); |
| if ((p = strrchr(path, DIRSEP)) != NULL) { |
| p[1] = '\0'; |
| } |
| (void) mg_snprintf(conn, path + strlen(path), |
| sizeof(path) - strlen(path), "%s", file_name); |
| } else { |
| cry(conn, "Bad SSI #include: [%s]", tag); |
| return; |
| } |
| |
| if ((fp = mg_fopen(path, "rb")) == NULL) { |
| cry(conn, "Cannot open SSI #include: [%s]: fopen(%s): %s", |
| tag, path, strerror(ERRNO)); |
| } else { |
| set_close_on_exec(fileno(fp)); |
| is_ssi = match_extension(path, conn->ctx->config[SSI_EXTENSIONS]); |
| if (is_ssi) { |
| send_ssi_file(conn, path, fp, include_level + 1); |
| } else { |
| send_file_data(conn, fp, INT64_MAX); |
| } |
| (void) fclose(fp); |
| } |
| } |
| |
| #if !defined(NO_POPEN) |
| static void do_ssi_exec(struct mg_connection *conn, char *tag) { |
| char cmd[BUFSIZ]; |
| FILE *fp; |
| |
| if (sscanf(tag, " \"%[^\"]\"", cmd) != 1) { |
| cry(conn, "Bad SSI #exec: [%s]", tag); |
| } else if ((fp = popen(cmd, "r")) == NULL) { |
| cry(conn, "Cannot SSI #exec: [%s]: %s", cmd, strerror(ERRNO)); |
| } else { |
| send_file_data(conn, fp, INT64_MAX); |
| (void) pclose(fp); |
| } |
| } |
| #endif // !NO_POPEN |
| |
| static void send_ssi_file(struct mg_connection *conn, const char *path, |
| FILE *fp, int include_level) { |
| char buf[BUFSIZ]; |
| int ch, len, in_ssi_tag; |
| |
| if (include_level > 10) { |
| cry(conn, "SSI #include level is too deep (%s)", path); |
| return; |
| } |
| |
| in_ssi_tag = 0; |
| len = 0; |
| |
| while ((ch = fgetc(fp)) != EOF) { |
| if (in_ssi_tag && ch == '>') { |
| in_ssi_tag = 0; |
| buf[len++] = (char) ch; |
| buf[len] = '\0'; |
| assert(len <= (int) sizeof(buf)); |
| if (len < 6 || memcmp(buf, "<!--#", 5) != 0) { |
| // Not an SSI tag, pass it |
| (void) mg_write(conn, buf, (size_t)len); |
| } else { |
| if (!memcmp(buf + 5, "include", 7)) { |
| do_ssi_include(conn, path, buf + 12, include_level); |
| #if !defined(NO_POPEN) |
| } else if (!memcmp(buf + 5, "exec", 4)) { |
| do_ssi_exec(conn, buf + 9); |
| #endif // !NO_POPEN |
| } else { |
| cry(conn, "%s: unknown SSI " "command: \"%s\"", path, buf); |
| } |
| } |
| len = 0; |
| } else if (in_ssi_tag) { |
| if (len == 5 && memcmp(buf, "<!--#", 5) != 0) { |
| // Not an SSI tag |
| in_ssi_tag = 0; |
| } else if (len == (int) sizeof(buf) - 2) { |
| cry(conn, "%s: SSI tag is too large", path); |
| len = 0; |
| } |
| buf[len++] = ch & 0xff; |
| } else if (ch == '<') { |
| in_ssi_tag = 1; |
| if (len > 0) { |
| (void) mg_write(conn, buf, (size_t)len); |
| } |
| len = 0; |
| buf[len++] = ch & 0xff; |
| } else { |
| buf[len++] = ch & 0xff; |
| if (len == (int) sizeof(buf)) { |
| (void) mg_write(conn, buf, (size_t)len); |
| len = 0; |
| } |
| } |
| } |
| |
| // Send the rest of buffered data |
| if (len > 0) { |
| (void) mg_write(conn, buf, (size_t)len); |
| } |
| } |
| |
| static void handle_ssi_file_request(struct mg_connection *conn, |
| const char *path) { |
| FILE *fp; |
| |
| if ((fp = mg_fopen(path, "rb")) == NULL) { |
| send_http_error(conn, 500, http_500_error, "fopen(%s): %s", path, |
| strerror(ERRNO)); |
| } else { |
| set_close_on_exec(fileno(fp)); |
| mg_printf(conn, "HTTP/1.1 200 OK\r\n" |
| "Content-Type: text/html\r\nConnection: %s\r\n\r\n", |
| suggest_connection_header(conn)); |
| send_ssi_file(conn, path, fp, 0); |
| (void) fclose(fp); |
| } |
| } |
| |
| static void send_options(struct mg_connection *conn) { |
| conn->request_info.status_code = 200; |
| |
| (void) mg_printf(conn, |
| "HTTP/1.1 200 OK\r\n" |
| "Allow: GET, POST, HEAD, CONNECT, PUT, DELETE, OPTIONS\r\n" |
| "DAV: 1\r\n\r\n"); |
| } |
| |
| // Writes PROPFIND properties for a collection element |
| static void print_props(struct mg_connection *conn, const char* uri, |
| struct mgstat* st) { |
| char mtime[64]; |
| gmt_time_string(mtime, sizeof(mtime), &st->mtime); |
| conn->num_bytes_sent += mg_printf(conn, |
| "<d:response>" |
| "<d:href>%s</d:href>" |
| "<d:propstat>" |
| "<d:prop>" |
| "<d:resourcetype>%s</d:resourcetype>" |
| "<d:getcontentlength>%" INT64_FMT "</d:getcontentlength>" |
| "<d:getlastmodified>%s</d:getlastmodified>" |
| "</d:prop>" |
| "<d:status>HTTP/1.1 200 OK</d:status>" |
| "</d:propstat>" |
| "</d:response>\n", |
| uri, |
| st->is_directory ? "<d:collection/>" : "", |
| st->size, |
| mtime); |
| } |
| |
| static void print_dav_dir_entry(struct de *de, void *data) { |
| char href[PATH_MAX]; |
| struct mg_connection *conn = (struct mg_connection *) data; |
| mg_snprintf(conn, href, sizeof(href), "%s%s", |
| conn->request_info.uri, de->file_name); |
| print_props(conn, href, &de->st); |
| } |
| |
| static void handle_propfind(struct mg_connection *conn, const char* path, |
| struct mgstat* st) { |
| const char *depth = mg_get_header(conn, "Depth"); |
| |
| conn->request_info.status_code = 207; |
| mg_printf(conn, "HTTP/1.1 207 Multi-Status\r\n" |
| "Connection: close\r\n" |
| "Content-Type: text/xml; charset=utf-8\r\n\r\n"); |
| |
| conn->num_bytes_sent += mg_printf(conn, |
| "<?xml version=\"1.0\" encoding=\"utf-8\"?>" |
| "<d:multistatus xmlns:d='DAV:'>\n"); |
| |
| // Print properties for the requested resource itself |
| print_props(conn, conn->request_info.uri, st); |
| |
| // If it is a directory, print directory entries too if Depth is not 0 |
| if (st->is_directory && |
| !mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes") && |
| (depth == NULL || strcmp(depth, "0") != 0)) { |
| scan_directory(conn, path, conn, &print_dav_dir_entry); |
| } |
| |
| conn->num_bytes_sent += mg_printf(conn, "%s\n", "</d:multistatus>"); |
| } |
| |
| // This is the heart of the Mongoose's logic. |
| // This function is called when the request is read, parsed and validated, |
| // and Mongoose must decide what action to take: serve a file, or |
| // a directory, or call embedded function, etcetera. |
| static void handle_request(struct mg_connection *conn) { |
| struct mg_request_info *ri = &conn->request_info; |
| char path[PATH_MAX]; |
| int uri_len; |
| struct mgstat st; |
| |
| if ((conn->request_info.query_string = strchr(ri->uri, '?')) != NULL) { |
| * conn->request_info.query_string++ = '\0'; |
| } |
| uri_len = strlen(ri->uri); |
| url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0); |
| remove_double_dots_and_double_slashes(ri->uri); |
| convert_uri_to_file_name(conn, ri->uri, path, sizeof(path)); |
| |
| DEBUG_TRACE(("%s", ri->uri)); |
| if (!check_authorization(conn, path)) { |
| send_authorization_request(conn); |
| } else if (call_user(conn, MG_NEW_REQUEST) != NULL) { |
| // Do nothing, callback has served the request |
| } else if (!strcmp(ri->request_method, "OPTIONS")) { |
| send_options(conn); |
| } else if (strstr(path, PASSWORDS_FILE_NAME)) { |
| // Do not allow to view passwords files |
| send_http_error(conn, 403, "Forbidden", "Access Forbidden"); |
| } else if (conn->ctx->config[DOCUMENT_ROOT] == NULL) { |
| send_http_error(conn, 404, "Not Found", "Not Found"); |
| } else if ((!strcmp(ri->request_method, "PUT") || |
| !strcmp(ri->request_method, "DELETE")) && |
| (conn->ctx->config[PUT_DELETE_PASSWORDS_FILE] == NULL || |
| !is_authorized_for_put(conn))) { |
| send_authorization_request(conn); |
| } else if (!strcmp(ri->request_method, "PUT")) { |
| put_file(conn, path); |
| } else if (!strcmp(ri->request_method, "DELETE")) { |
| if (mg_remove(path) == 0) { |
| send_http_error(conn, 200, "OK", ""); |
| } else { |
| send_http_error(conn, 500, http_500_error, "remove(%s): %s", path, |
| strerror(ERRNO)); |
| } |
| } else if (mg_stat(path, &st) != 0) { |
| send_http_error(conn, 404, "Not Found", "%s", "File not found"); |
| } else if (st.is_directory && ri->uri[uri_len - 1] != '/') { |
| (void) mg_printf(conn, |
| "HTTP/1.1 301 Moved Permanently\r\n" |
| "Location: %s/\r\n\r\n", ri->uri); |
| } else if (!strcmp(ri->request_method, "PROPFIND")) { |
| handle_propfind(conn, path, &st); |
| } else if (st.is_directory && |
| !substitute_index_file(conn, path, sizeof(path), &st)) { |
| if (!mg_strcasecmp(conn->ctx->config[ENABLE_DIRECTORY_LISTING], "yes")) { |
| handle_directory_request(conn, path); |
| } else { |
| send_http_error(conn, 403, "Directory Listing Denied", |
| "Directory listing denied"); |
| } |
| #if !defined(NO_CGI) |
| } else if (match_extension(path, conn->ctx->config[CGI_EXTENSIONS])) { |
| if (strcmp(ri->request_method, "POST") && |
| strcmp(ri->request_method, "GET")) { |
| send_http_error(conn, 501, "Not Implemented", |
| "Method %s is not implemented", ri->request_method); |
| } else { |
| handle_cgi_request(conn, path); |
| } |
| #endif // !NO_CGI |
| } else if (match_extension(path, conn->ctx->config[SSI_EXTENSIONS])) { |
| handle_ssi_file_request(conn, path); |
| } else if (is_not_modified(conn, &st)) { |
| send_http_error(conn, 304, "Not Modified", ""); |
| } else { |
| handle_file_request(conn, path, &st); |
| } |
| } |
| |
| static void close_all_listening_sockets(struct mg_context *ctx) { |
| struct socket *sp, *tmp; |
| for (sp = ctx->listening_sockets; sp != NULL; sp = tmp) { |
| tmp = sp->next; |
| (void) closesocket(sp->sock); |
| free(sp); |
| } |
| } |
| |
| // Valid listening port specification is: [ip_address:]port[s|p] |
| // Examples: 80, 443s, 127.0.0.1:3128p, 1.2.3.4:8080sp |
| static int parse_port_string(const struct vec *vec, struct socket *so) { |
| struct usa *usa = &so->lsa; |
| int a, b, c, d, port, len; |
| |
| // MacOS needs that. If we do not zero it, subsequent bind() will fail. |
| memset(so, 0, sizeof(*so)); |
| |
| if (sscanf(vec->ptr, "%d.%d.%d.%d:%d%n", &a, &b, &c, &d, &port, &len) == 5) { |
| // IP address to bind to is specified |
| usa->u.sin.sin_addr.s_addr = htonl((a << 24) | (b << 16) | (c << 8) | d); |
| } else if (sscanf(vec->ptr, "%d%n", &port, &len) == 1) { |
| // Only port number is specified. Bind to all addresses |
| usa->u.sin.sin_addr.s_addr = htonl(INADDR_ANY); |
| } else { |
| return 0; |
| } |
| assert(len > 0 && len <= (int) vec->len); |
| |
| if (strchr("sp,", vec->ptr[len]) == NULL) { |
| return 0; |
| } |
| |
| so->is_ssl = vec->ptr[len] == 's'; |
| so->is_proxy = vec->ptr[len] == 'p'; |
| usa->len = sizeof(usa->u.sin); |
| usa->u.sin.sin_family = AF_INET; |
| usa->u.sin.sin_port = htons((uint16_t) port); |
| |
| return 1; |
| } |
| |
| static int set_ports_option(struct mg_context *ctx) { |
| const char *list = ctx->config[LISTENING_PORTS]; |
| int on = 1, success = 1; |
| SOCKET sock; |
| struct vec vec; |
| struct socket so, *listener; |
| |
| struct linger linger; |
| linger.l_onoff = 1; |
| linger.l_linger = 1; |
| |
| while (success && (list = next_option(list, &vec, NULL)) != NULL) { |
| if (!parse_port_string(&vec, &so)) { |
| cry(fc(ctx), "%s: %.*s: invalid port spec. Expecting list of: %s", |
| __func__, vec.len, vec.ptr, "[IP_ADDRESS:]PORT[s|p]"); |
| success = 0; |
| } else if (so.is_ssl && ctx->ssl_ctx == NULL) { |
| cry(fc(ctx), "Cannot add SSL socket, is -ssl_certificate option set?"); |
| success = 0; |
| } else if ((sock = socket(PF_INET, SOCK_STREAM, 6)) == INVALID_SOCKET || |
| #if !defined(_WIN32) |
| // On Windows, SO_REUSEADDR is recommended only for |
| // broadcast UDP sockets |
| setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, |
| sizeof(on)) != 0 || |
| #endif // !_WIN32 |
| // Set TCP keep-alive. This is needed because if HTTP-level |
| // keep-alive is enabled, and client resets the connection, |
| // server won't get TCP FIN or RST and will keep the connection |
| // open forever. With TCP keep-alive, next keep-alive |
| // handshake will figure out that the client is down and |
| // will close the server end. |
| // Thanks to Igor Klopov who suggested the patch. |
| setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *) &on, |
| sizeof(on)) != 0 || |
| setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &linger, |
| sizeof(linger)) || |
| bind(sock, &so.lsa.u.sa, so.lsa.len) != 0 || |
| listen(sock, 100) != 0) { |
| closesocket(sock); |
| cry(fc(ctx), "%s: cannot bind to %.*s: %s", __func__, |
| vec.len, vec.ptr, strerror(ERRNO)); |
| success = 0; |
| } else if ((listener = (struct socket *) |
| calloc(1, sizeof(*listener))) == NULL) { |
| closesocket(sock); |
| cry(fc(ctx), "%s: %s", __func__, strerror(ERRNO)); |
| success = 0; |
| } else { |
| *listener = so; |
| listener->sock = sock; |
| set_close_on_exec(listener->sock); |
| listener->next = ctx->listening_sockets; |
| ctx->listening_sockets = listener; |
| } |
| } |
| |
| if (!success) { |
| close_all_listening_sockets(ctx); |
| } |
| |
| return success; |
| } |
| |
| static void log_header(const struct mg_connection *conn, const char *header, |
| FILE *fp) { |
| const char *header_value; |
| |
| if ((header_value = mg_get_header(conn, header)) == NULL) { |
| (void) fprintf(fp, "%s", " -"); |
| } else { |
| (void) fprintf(fp, " \"%s\"", header_value); |
| } |
| } |
| |
| static void log_access(const struct mg_connection *conn) { |
| const struct mg_request_info *ri; |
| FILE *fp; |
| char date[64]; |
| |
| fp = conn->ctx->config[ACCESS_LOG_FILE] == NULL ? NULL : |
| mg_fopen(conn->ctx->config[ACCESS_LOG_FILE], "a+"); |
| |
| if (fp == NULL) |
| return; |
| |
| (void) strftime(date, sizeof(date), "%d/%b/%Y:%H:%M:%S %z", |
| localtime(&conn->birth_time)); |
| |
| ri = &conn->request_info; |
| |
| flockfile(fp); |
| |
| (void) fprintf(fp, |
| "%s - %s [%s] \"%s %s HTTP/%s\" %d %" INT64_FMT, |
| inet_ntoa(conn->client.rsa.u.sin.sin_addr), |
| ri->remote_user == NULL ? "-" : ri->remote_user, |
| date, |
| ri->request_method ? ri->request_method : "-", |
| ri->uri ? ri->uri : "-", |
| ri->http_version, |
| conn->request_info.status_code, conn->num_bytes_sent); |
| log_header(conn, "Referer", fp); |
| log_header(conn, "User-Agent", fp); |
| (void) fputc('\n', fp); |
| (void) fflush(fp); |
| |
| funlockfile(fp); |
| (void) fclose(fp); |
| } |
| |
| static int isbyte(int n) { |
| return n >= 0 && n <= 255; |
| } |
| |
| // Verify given socket address against the ACL. |
| // Return -1 if ACL is malformed, 0 if address is disallowed, 1 if allowed. |
| static int check_acl(struct mg_context *ctx, const struct usa *usa) { |
| int a, b, c, d, n, mask, allowed; |
| char flag; |
| uint32_t acl_subnet, acl_mask, remote_ip; |
| struct vec vec; |
| const char *list = ctx->config[ACCESS_CONTROL_LIST]; |
| |
| if (list == NULL) { |
| return 1; |
| } |
| |
| (void) memcpy(&remote_ip, &usa->u.sin.sin_addr, sizeof(remote_ip)); |
| |
| // If any ACL is set, deny by default |
| allowed = '-'; |
| |
| while ((list = next_option(list, &vec, NULL)) != NULL) { |
| mask = 32; |
| |
| if (sscanf(vec.ptr, "%c%d.%d.%d.%d%n", &flag, &a, &b, &c, &d, &n) != 5) { |
| cry(fc(ctx), "%s: subnet must be [+|-]x.x.x.x[/x]", __func__); |
| return -1; |
| } else if (flag != '+' && flag != '-') { |
| cry(fc(ctx), "%s: flag must be + or -: [%s]", __func__, vec.ptr); |
| return -1; |
| } else if (!isbyte(a)||!isbyte(b)||!isbyte(c)||!isbyte(d)) { |
| cry(fc(ctx), "%s: bad ip address: [%s]", __func__, vec.ptr); |
| return -1; |
| } else if (sscanf(vec.ptr + n, "/%d", &mask) == 0) { |
| // Do nothing, no mask specified |
| } else if (mask < 0 || mask > 32) { |
| cry(fc(ctx), "%s: bad subnet mask: %d [%s]", __func__, n, vec.ptr); |
| return -1; |
| } |
| |
| acl_subnet = (a << 24) | (b << 16) | (c << 8) | d; |
| acl_mask = mask ? 0xffffffffU << (32 - mask) : 0; |
| |
| if (acl_subnet == (ntohl(remote_ip) & acl_mask)) { |
| allowed = flag; |
| } |
| } |
| |
| return allowed == '+'; |
| } |
| |
| static void add_to_set(SOCKET fd, fd_set *set, int *max_fd) { |
| FD_SET(fd, set); |
| if (fd > (SOCKET) *max_fd) { |
| *max_fd = (int) fd; |
| } |
| } |
| |
| #if !defined(_WIN32) |
| static int set_uid_option(struct mg_context *ctx) { |
| struct passwd *pw; |
| const char *uid = ctx->config[RUN_AS_USER]; |
| int success = 0; |
| |
| if (uid == NULL) { |
| success = 1; |
| } else { |
| if ((pw = getpwnam(uid)) == NULL) { |
| cry(fc(ctx), "%s: unknown user [%s]", __func__, uid); |
| } else if (setgid(pw->pw_gid) == -1) { |
| cry(fc(ctx), "%s: setgid(%s): %s", __func__, uid, strerror(errno)); |
| } else if (setuid(pw->pw_uid) == -1) { |
| cry(fc(ctx), "%s: setuid(%s): %s", __func__, uid, strerror(errno)); |
| } else { |
| success = 1; |
| } |
| } |
| |
| return success; |
| } |
| #endif // !_WIN32 |
| |
| #if !defined(NO_SSL) |
| static pthread_mutex_t *ssl_mutexes; |
| |
| static void ssl_locking_callback(int mode, int mutex_num, const char *file, |
| int line) { |
| line = 0; // Unused |
| file = NULL; // Unused |
| |
| if (mode & CRYPTO_LOCK) { |
| (void) pthread_mutex_lock(&ssl_mutexes[mutex_num]); |
| } else { |
| (void) pthread_mutex_unlock(&ssl_mutexes[mutex_num]); |
| } |
| } |
| |
| static unsigned long ssl_id_callback(void) { |
| return (unsigned long) pthread_self(); |
| } |
| |
| #if !defined(NO_SSL_DL) |
| static int load_dll(struct mg_context *ctx, const char *dll_name, |
| struct ssl_func *sw) { |
| union {void *p; void (*fp)(void);} u; |
| void *dll_handle; |
| struct ssl_func *fp; |
| |
| if ((dll_handle = dlopen(dll_name, RTLD_LAZY)) == NULL) { |
| cry(fc(ctx), "%s: cannot load %s", __func__, dll_name); |
| return 0; |
| } |
| |
| for (fp = sw; fp->name != NULL; fp++) { |
| #ifdef _WIN32 |
| // GetProcAddress() returns pointer to function |
| u.fp = (void (*)(void)) dlsym(dll_handle, fp->name); |
| #else |
| // dlsym() on UNIX returns void *. ISO C forbids casts of data pointers to |
| // function pointers. We need to use a union to make a cast. |
| u.p = dlsym(dll_handle, fp->name); |
| #endif // _WIN32 |
| if (u.fp == NULL) { |
| cry(fc(ctx), "%s: %s: cannot find %s", __func__, dll_name, fp->name); |
| return 0; |
| } else { |
| fp->ptr = u.fp; |
| } |
| } |
| |
| return 1; |
| } |
| #endif // NO_SSL_DL |
| |
| // Dynamically load SSL library. Set up ctx->ssl_ctx pointer. |
| static int set_ssl_option(struct mg_context *ctx) { |
| struct mg_request_info request_info; |
| SSL_CTX *CTX; |
| int i, size; |
| const char *pem = ctx->config[SSL_CERTIFICATE]; |
| const char *chain = ctx->config[SSL_CHAIN_FILE]; |
| |
| if (pem == NULL) { |
| return 1; |
| } |
| |
| #if !defined(NO_SSL_DL) |
| if (!load_dll(ctx, SSL_LIB, ssl_sw) || |
| !load_dll(ctx, CRYPTO_LIB, crypto_sw)) { |
| return 0; |
| } |
| #endif // NO_SSL_DL |
| |
| // Initialize SSL crap |
| SSL_library_init(); |
| SSL_load_error_strings(); |
| |
| if ((CTX = SSL_CTX_new(SSLv23_server_method())) == NULL) { |
| cry(fc(ctx), "SSL_CTX_new error: %s", ssl_error()); |
| } else if (ctx->user_callback != NULL) { |
| memset(&request_info, 0, sizeof(request_info)); |
| request_info.user_data = ctx->user_data; |
| ctx->user_callback(MG_INIT_SSL, (struct mg_connection *) CTX, |
| &request_info); |
| } |
| |
| if (CTX != NULL && SSL_CTX_use_certificate_file(CTX, pem, |
| SSL_FILETYPE_PEM) == 0) { |
| cry(fc(ctx), "%s: cannot open %s: %s", __func__, pem, ssl_error()); |
| return 0; |
| } else if (CTX != NULL && SSL_CTX_use_PrivateKey_file(CTX, pem, |
| SSL_FILETYPE_PEM) == 0) { |
| cry(fc(ctx), "%s: cannot open %s: %s", NULL, pem, ssl_error()); |
| return 0; |
| } |
| |
| if (CTX != NULL && chain != NULL && |
| SSL_CTX_use_certificate_chain_file(CTX, chain) == 0) { |
| cry(fc(ctx), "%s: cannot open %s: %s", NULL, chain, ssl_error()); |
| return 0; |
| } |
| |
| // Initialize locking callbacks, needed for thread safety. |
| // http://www.openssl.org/support/faq.html#PROG1 |
| size = sizeof(pthread_mutex_t) * CRYPTO_num_locks(); |
| if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) { |
| cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error()); |
| return 0; |
| } |
| |
| for (i = 0; i < CRYPTO_num_locks(); i++) { |
| pthread_mutex_init(&ssl_mutexes[i], NULL); |
| } |
| |
| CRYPTO_set_locking_callback(&ssl_locking_callback); |
| CRYPTO_set_id_callback(&ssl_id_callback); |
| |
| // Done with everything. Save the context. |
| ctx->ssl_ctx = CTX; |
| |
| return 1; |
| } |
| |
| static void uninitialize_ssl(struct mg_context *ctx) { |
| int i; |
| if (ctx->ssl_ctx != NULL) { |
| CRYPTO_set_locking_callback(NULL); |
| for (i = 0; i < CRYPTO_num_locks(); i++) { |
| pthread_mutex_destroy(&ssl_mutexes[i]); |
| } |
| CRYPTO_set_locking_callback(NULL); |
| CRYPTO_set_id_callback(NULL); |
| } |
| } |
| #endif // !NO_SSL |
| |
| static int set_gpass_option(struct mg_context *ctx) { |
| struct mgstat mgstat; |
| const char *path = ctx->config[GLOBAL_PASSWORDS_FILE]; |
| return path == NULL || mg_stat(path, &mgstat) == 0; |
| } |
| |
| static int set_acl_option(struct mg_context *ctx) { |
| struct usa fake; |
| return check_acl(ctx, &fake) != -1; |
| } |
| |
| static void reset_per_request_attributes(struct mg_connection *conn) { |
| struct mg_request_info *ri = &conn->request_info; |
| |
| // Reset request info attributes. DO NOT TOUCH is_ssl, remote_ip, remote_port |
| if (ri->remote_user != NULL) { |
| free((void *) ri->remote_user); |
| } |
| ri->remote_user = ri->request_method = ri->uri = ri->http_version = NULL; |
| ri->num_headers = 0; |
| ri->status_code = -1; |
| |
| conn->num_bytes_sent = conn->consumed_content = 0; |
| conn->content_len = -1; |
| conn->request_len = conn->data_len = 0; |
| } |
| |
| static void close_socket_gracefully(SOCKET sock) { |
| char buf[BUFSIZ]; |
| int n; |
| |
| // Send FIN to the client |
| (void) shutdown(sock, SHUT_WR); |
| set_non_blocking_mode(sock); |
| |
| // Read and discard pending data. If we do not do that and close the |
| // socket, the data in the send buffer may be discarded. This |
| // behaviour is seen on Windows, when client keeps sending data |
| // when server decide to close the connection; then when client |
| // does recv() it gets no data back. |
| do { |
| n = pull(NULL, sock, NULL, buf, sizeof(buf)); |
| } while (n > 0); |
| |
| // Now we know that our FIN is ACK-ed, safe to close |
| (void) closesocket(sock); |
| } |
| |
| static void close_connection(struct mg_connection *conn) { |
| if (conn->ssl) { |
| SSL_free(conn->ssl); |
| conn->ssl = NULL; |
| } |
| |
| if (conn->client.sock != INVALID_SOCKET) { |
| close_socket_gracefully(conn->client.sock); |
| } |
| } |
| |
| static void discard_current_request_from_buffer(struct mg_connection *conn) { |
| int buffered_len, body_len; |
| |
| buffered_len = conn->data_len - conn->request_len; |
| assert(buffered_len >= 0); |
| |
| if (conn->content_len == -1) { |
| body_len = 0; |
| } else if (conn->content_len < (int64_t) buffered_len) { |
| body_len = (int) conn->content_len; |
| } else { |
| body_len = buffered_len; |
| } |
| |
| conn->data_len -= conn->request_len + body_len; |
| memmove(conn->buf, conn->buf + conn->request_len + body_len, |
| (size_t) conn->data_len); |
| } |
| |
| static int parse_url(const char *url, char *host, int *port) { |
| int len; |
| |
| if (sscanf(url, "%*[htps]://%1024[^:]:%d%n", host, port, &len) == 2 || |
| sscanf(url, "%1024[^:]:%d%n", host, port, &len) == 2) { |
| } else if (sscanf(url, "%*[htps]://%1024[^/]%n", host, &len) == 1) { |
| *port = 80; |
| } else { |
| sscanf(url, "%1024[^/]%n", host, &len); |
| *port = 80; |
| } |
| DEBUG_TRACE(("Host:%s, port:%d", host, *port)); |
| |
| return len; |
| } |
| |
| static void handle_proxy_request(struct mg_connection *conn) { |
| struct mg_request_info *ri = &conn->request_info; |
| char host[1025], buf[BUFSIZ]; |
| int port, is_ssl, len, i, n; |
| |
| DEBUG_TRACE(("URL: %s", ri->uri)); |
| if (ri->uri == NULL || |
| ri->uri[0] == '/' || |
| (len = parse_url(ri->uri, host, &port)) == 0) { |
| return; |
| } |
| |
| if (conn->peer == NULL) { |
| is_ssl = !strcmp(ri->request_method, "CONNECT"); |
| if ((conn->peer = mg_connect(conn, host, port, is_ssl)) == NULL) { |
| return; |
| } |
| conn->peer->client.is_ssl = is_ssl; |
| } |
| |
| // Forward client's request to the target |
| mg_printf(conn->peer, "%s %s HTTP/%s\r\n", ri->request_method, ri->uri + len, |
| ri->http_version); |
| |
| // And also all headers. TODO(lsm): anonymize! |
| for (i = 0; i < ri->num_headers; i++) { |
| mg_printf(conn->peer, "%s: %s\r\n", ri->http_headers[i].name, |
| ri->http_headers[i].value); |
| } |
| // End of headers, final newline |
| mg_write(conn->peer, "\r\n", 2); |
| |
| // Read and forward body data if any |
| if (!strcmp(ri->request_method, "POST")) { |
| forward_body_data(conn, NULL, conn->peer->client.sock, conn->peer->ssl); |
| } |
| |
| // Read data from the target and forward it to the client |
| while ((n = pull(NULL, conn->peer->client.sock, conn->peer->ssl, |
| buf, sizeof(buf))) > 0) { |
| if (mg_write(conn, buf, (size_t)n) != n) { |
| break; |
| } |
| } |
| |
| if (!conn->peer->client.is_ssl) { |
| close_connection(conn->peer); |
| free(conn->peer); |
| conn->peer = NULL; |
| } |
| } |
| |
| static int is_valid_uri(const char *uri) { |
| // Conform to http://www.w3.org/Protocols/rfc2616/rfc2616-sec5.html#sec5.1.2 |
| // URI can be an asterisk (*) or should start with slash. |
| return (uri[0] == '/' || (uri[0] == '*' && uri[1] == '\0')); |
| } |
| |
| static void process_new_connection(struct mg_connection *conn) { |
| struct mg_request_info *ri = &conn->request_info; |
| int keep_alive_enabled; |
| const char *cl; |
| |
| keep_alive_enabled = !strcmp(conn->ctx->config[ENABLE_KEEP_ALIVE], "yes"); |
| |
| do { |
| reset_per_request_attributes(conn); |
| |
| // If next request is not pipelined, read it in |
| if ((conn->request_len = get_request_len(conn->buf, conn->data_len)) == 0) { |
| conn->request_len = read_request(NULL, conn->client.sock, conn->ssl, |
| conn->buf, conn->buf_size, &conn->data_len); |
| } |
| assert(conn->data_len >= conn->request_len); |
| if (conn->request_len == 0 && conn->data_len == conn->buf_size) { |
| send_http_error(conn, 413, "Request Too Large", ""); |
| return; |
| } if (conn->request_len <= 0) { |
| return; // Remote end closed the connection |
| } |
| |
| // Nul-terminate the request cause parse_http_request() uses sscanf |
| conn->buf[conn->request_len - 1] = '\0'; |
| if (!parse_http_request(conn->buf, ri) || |
| (!conn->client.is_proxy && !is_valid_uri(ri->uri))) { |
| // Do not put garbage in the access log, just send it back to the client |
| send_http_error(conn, 400, "Bad Request", |
| "Cannot parse HTTP request: [%.*s]", conn->data_len, conn->buf); |
| } else if (strcmp(ri->http_version, "1.0") && |
| strcmp(ri->http_version, "1.1")) { |
| // Request seems valid, but HTTP version is strange |
| send_http_error(conn, 505, "HTTP version not supported", ""); |
| log_access(conn); |
| } else { |
| // Request is valid, handle it |
| cl = get_header(ri, "Content-Length"); |
| conn->content_len = cl == NULL ? -1 : strtoll(cl, NULL, 10); |
| conn->birth_time = time(NULL); |
| if (conn->client.is_proxy) { |
| handle_proxy_request(conn); |
| } else { |
| handle_request(conn); |
| } |
| log_access(conn); |
| discard_current_request_from_buffer(conn); |
| } |
| // conn->peer is not NULL only for SSL-ed proxy connections |
| } while (conn->ctx->stop_flag == 0 && |
| (conn->peer || (keep_alive_enabled && should_keep_alive(conn)))); |
| } |
| |
| // Worker threads take accepted socket from the queue |
| static int consume_socket(struct mg_context *ctx, struct socket *sp) { |
| (void) pthread_mutex_lock(&ctx->mutex); |
| DEBUG_TRACE(("going idle")); |
| |
| // If the queue is empty, wait. We're idle at this point. |
| while (ctx->sq_head == ctx->sq_tail && ctx->stop_flag == 0) { |
| pthread_cond_wait(&ctx->sq_full, &ctx->mutex); |
| } |
| |
| // If we're stopping, sq_head may be equal to sq_tail. |
| if (ctx->sq_head > ctx->sq_tail) { |
| // Copy socket from the queue and increment tail |
| *sp = ctx->queue[ctx->sq_tail % ARRAY_SIZE(ctx->queue)]; |
| ctx->sq_tail++; |
| DEBUG_TRACE(("grabbed socket %d, going busy", sp->sock)); |
| |
| // Wrap pointers if needed |
| while (ctx->sq_tail > (int) ARRAY_SIZE(ctx->queue)) { |
| ctx->sq_tail -= ARRAY_SIZE(ctx->queue); |
| ctx->sq_head -= ARRAY_SIZE(ctx->queue); |
| } |
| } |
| |
| (void) pthread_cond_signal(&ctx->sq_empty); |
| (void) pthread_mutex_unlock(&ctx->mutex); |
| |
| return !ctx->stop_flag; |
| } |
| |
| static void worker_thread(struct mg_context *ctx) { |
| struct mg_connection *conn; |
| int buf_size = atoi(ctx->config[MAX_REQUEST_SIZE]); |
| |
| conn = (struct mg_connection *) calloc(1, sizeof(*conn) + buf_size); |
| conn->buf_size = buf_size; |
| conn->buf = (char *) (conn + 1); |
| assert(conn != NULL); |
| |
| // Call consume_socket() even when ctx->stop_flag > 0, to let it signal |
| // sq_empty condvar to wake up the master waiting in produce_socket() |
| while (consume_socket(ctx, &conn->client)) { |
| conn->birth_time = time(NULL); |
| conn->ctx = ctx; |
| |
| // Fill in IP, port info early so even if SSL setup below fails, |
| // error handler would have the corresponding info. |
| // Thanks to Johannes Winkelmann for the patch. |
| conn->request_info.remote_port = ntohs(conn->client.rsa.u.sin.sin_port); |
| memcpy(&conn->request_info.remote_ip, |
| &conn->client.rsa.u.sin.sin_addr.s_addr, 4); |
| conn->request_info.remote_ip = ntohl(conn->request_info.remote_ip); |
| conn->request_info.is_ssl = conn->client.is_ssl; |
| |
| if (!conn->client.is_ssl || |
| (conn->client.is_ssl && sslize(conn, SSL_accept))) { |
| process_new_connection(conn); |
| } |
| |
| close_connection(conn); |
| } |
| free(conn); |
| |
| // Signal master that we're done with connection and exiting |
| (void) pthread_mutex_lock(&ctx->mutex); |
| ctx->num_threads--; |
| (void) pthread_cond_signal(&ctx->cond); |
| assert(ctx->num_threads >= 0); |
| (void) pthread_mutex_unlock(&ctx->mutex); |
| |
| DEBUG_TRACE(("exiting")); |
| } |
| |
| // Master thread adds accepted socket to a queue |
| static void produce_socket(struct mg_context *ctx, const struct socket *sp) { |
| (void) pthread_mutex_lock(&ctx->mutex); |
| |
| // If the queue is full, wait |
| while (ctx->stop_flag == 0 && |
| ctx->sq_head - ctx->sq_tail >= (int) ARRAY_SIZE(ctx->queue)) { |
| (void) pthread_cond_wait(&ctx->sq_empty, &ctx->mutex); |
| } |
| |
| if (ctx->sq_head - ctx->sq_tail < (int) ARRAY_SIZE(ctx->queue)) { |
| // Copy socket to the queue and increment head |
| ctx->queue[ctx->sq_head % ARRAY_SIZE(ctx->queue)] = *sp; |
| ctx->sq_head++; |
| DEBUG_TRACE(("queued socket %d", sp->sock)); |
| } |
| |
| (void) pthread_cond_signal(&ctx->sq_full); |
| (void) pthread_mutex_unlock(&ctx->mutex); |
| } |
| |
| static void accept_new_connection(const struct socket *listener, |
| struct mg_context *ctx) { |
| struct socket accepted; |
| int allowed; |
| |
| accepted.rsa.len = sizeof(accepted.rsa.u.sin); |
| accepted.lsa = listener->lsa; |
| accepted.sock = accept(listener->sock, &accepted.rsa.u.sa, &accepted.rsa.len); |
| if (accepted.sock != INVALID_SOCKET) { |
| allowed = check_acl(ctx, &accepted.rsa); |
| if (allowed) { |
| // Put accepted socket structure into the queue |
| DEBUG_TRACE(("accepted socket %d", accepted.sock)); |
| accepted.is_ssl = listener->is_ssl; |
| accepted.is_proxy = listener->is_proxy; |
| produce_socket(ctx, &accepted); |
| } else { |
| cry(fc(ctx), "%s: %s is not allowed to connect", |
| __func__, inet_ntoa(accepted.rsa.u.sin.sin_addr)); |
| (void) closesocket(accepted.sock); |
| } |
| } |
| } |
| |
| static void master_thread(struct mg_context *ctx) { |
| fd_set read_set; |
| struct timeval tv; |
| struct socket *sp; |
| int max_fd; |
| |
| while (ctx->stop_flag == 0) { |
| FD_ZERO(&read_set); |
| max_fd = -1; |
| |
| // Add listening sockets to the read set |
| for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) { |
| add_to_set(sp->sock, &read_set, &max_fd); |
| } |
| |
| tv.tv_sec = 0; |
| tv.tv_usec = 200 * 1000; |
| |
| if (select(max_fd + 1, &read_set, NULL, NULL, &tv) < 0) { |
| #ifdef _WIN32 |
| // On windows, if read_set and write_set are empty, |
| // select() returns "Invalid parameter" error |
| // (at least on my Windows XP Pro). So in this case, we sleep here. |
| sleep(1); |
| #endif // _WIN32 |
| } else { |
| for (sp = ctx->listening_sockets; sp != NULL; sp = sp->next) { |
| if (ctx->stop_flag == 0 && FD_ISSET(sp->sock, &read_set)) { |
| accept_new_connection(sp, ctx); |
| } |
| } |
| } |
| } |
| DEBUG_TRACE(("stopping workers")); |
| |
| // Stop signal received: somebody called mg_stop. Quit. |
| close_all_listening_sockets(ctx); |
| |
| // Wakeup workers that are waiting for connections to handle. |
| pthread_cond_broadcast(&ctx->sq_full); |
| |
| // Wait until all threads finish |
| (void) pthread_mutex_lock(&ctx->mutex); |
| while (ctx->num_threads > 0) { |
| (void) pthread_cond_wait(&ctx->cond, &ctx->mutex); |
| } |
| (void) pthread_mutex_unlock(&ctx->mutex); |
| |
| // All threads exited, no sync is needed. Destroy mutex and condvars |
| (void) pthread_mutex_destroy(&ctx->mutex); |
| (void) pthread_cond_destroy(&ctx->cond); |
| (void) pthread_cond_destroy(&ctx->sq_empty); |
| (void) pthread_cond_destroy(&ctx->sq_full); |
| |
| #if !defined(NO_SSL) |
| uninitialize_ssl(ctx); |
| #endif |
| |
| // Signal mg_stop() that we're done |
| ctx->stop_flag = 2; |
| |
| DEBUG_TRACE(("exiting")); |
| } |
| |
| static void free_context(struct mg_context *ctx) { |
| int i; |
| |
| // Deallocate config parameters |
| for (i = 0; i < NUM_OPTIONS; i++) { |
| if (ctx->config[i] != NULL) |
| free(ctx->config[i]); |
| } |
| |
| // Deallocate SSL context |
| if (ctx->ssl_ctx != NULL) { |
| SSL_CTX_free(ctx->ssl_ctx); |
| } |
| #ifndef NO_SSL |
| if (ssl_mutexes != NULL) { |
| free(ssl_mutexes); |
| } |
| #endif // !NO_SSL |
| |
| // Deallocate context itself |
| free(ctx); |
| } |
| |
| void mg_stop(struct mg_context *ctx) { |
| ctx->stop_flag = 1; |
| |
| // Wait until mg_fini() stops |
| while (ctx->stop_flag != 2) { |
| (void) sleep(0); |
| } |
| free_context(ctx); |
| |
| #if defined(_WIN32) && !defined(__SYMBIAN32__) |
| (void) WSACleanup(); |
| #endif // _WIN32 |
| } |
| |
| struct mg_context *mg_start(mg_callback_t user_callback, void *user_data, |
| const char **options) { |
| struct mg_context *ctx; |
| const char *name, *value, *default_value; |
| int i; |
| |
| #if defined(_WIN32) && !defined(__SYMBIAN32__) |
| WSADATA data; |
| WSAStartup(MAKEWORD(2,2), &data); |
| #endif // _WIN32 |
| |
| // Allocate context and initialize reasonable general case defaults. |
| // TODO(lsm): do proper error handling here. |
| ctx = (struct mg_context *) calloc(1, sizeof(*ctx)); |
| ctx->user_callback = user_callback; |
| ctx->user_data = user_data; |
| |
| while (options && (name = *options++) != NULL) { |
| if ((i = get_option_index(name)) == -1) { |
| cry(fc(ctx), "Invalid option: %s", name); |
| free_context(ctx); |
| return NULL; |
| } else if ((value = *options++) == NULL) { |
| cry(fc(ctx), "%s: option value cannot be NULL", name); |
| free_context(ctx); |
| return NULL; |
| } |
| ctx->config[i] = mg_strdup(value); |
| DEBUG_TRACE(("[%s] -> [%s]", name, value)); |
| } |
| |
| // Set default value if needed |
| for (i = 0; config_options[i * ENTRIES_PER_CONFIG_OPTION] != NULL; i++) { |
| default_value = config_options[i * ENTRIES_PER_CONFIG_OPTION + 2]; |
| if (ctx->config[i] == NULL && default_value != NULL) { |
| ctx->config[i] = mg_strdup(default_value); |
| DEBUG_TRACE(("Setting default: [%s] -> [%s]", |
| config_options[i * ENTRIES_PER_CONFIG_OPTION + 1], |
| default_value)); |
| } |
| } |
| |
| // NOTE(lsm): order is important here. SSL certificates must |
| // be initialized before listening ports. UID must be set last. |
| if (!set_gpass_option(ctx) || |
| #if !defined(NO_SSL) |
| !set_ssl_option(ctx) || |
| #endif |
| !set_ports_option(ctx) || |
| #if !defined(_WIN32) |
| !set_uid_option(ctx) || |
| #endif |
| !set_acl_option(ctx)) { |
| free_context(ctx); |
| return NULL; |
| } |
| |
| #if !defined(_WIN32) && !defined(__SYMBIAN32__) |
| // Ignore SIGPIPE signal, so if browser cancels the request, it |
| // won't kill the whole process. |
| (void) signal(SIGPIPE, SIG_IGN); |
| #endif // !_WIN32 |
| |
| (void) pthread_mutex_init(&ctx->mutex, NULL); |
| (void) pthread_cond_init(&ctx->cond, NULL); |
| (void) pthread_cond_init(&ctx->sq_empty, NULL); |
| (void) pthread_cond_init(&ctx->sq_full, NULL); |
| |
| // Start master (listening) thread |
| start_thread(ctx, (mg_thread_func_t) master_thread, ctx); |
| |
| // Start worker threads |
| for (i = 0; i < atoi(ctx->config[NUM_THREADS]); i++) { |
| if (start_thread(ctx, (mg_thread_func_t) worker_thread, ctx) != 0) { |
| cry(fc(ctx), "Cannot start worker thread: %d", ERRNO); |
| } else { |
| ctx->num_threads++; |
| } |
| } |
| |
| return ctx; |
| } |