| /* |
| * httpd.c - a simple HTTP server |
| */ |
| |
| /* |
| * Copyright (C) 2011-2012 Christian Beier <dontmind@freeshell.org> |
| * Copyright (C) 2002 RealVNC Ltd. |
| * Copyright (C) 1999 AT&T Laboratories Cambridge. All Rights Reserved. |
| * |
| * This is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This software is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this software; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
| * USA. |
| */ |
| |
| #ifdef __STRICT_ANSI__ |
| #define _BSD_SOURCE |
| #define _POSIX_SOURCE |
| #endif |
| |
| #include <rfb/rfb.h> |
| |
| #include <ctype.h> |
| #ifdef LIBVNCSERVER_HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #ifdef LIBVNCSERVER_HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| #ifdef LIBVNCSERVER_HAVE_FCNTL_H |
| #include <fcntl.h> |
| #endif |
| #include <errno.h> |
| |
| #ifdef WIN32 |
| #include <io.h> |
| #include <winsock2.h> |
| #include <ws2tcpip.h> |
| #define close closesocket |
| #if defined(_MSC_VER) |
| #include <BaseTsd.h> /* For the missing ssize_t */ |
| #define ssize_t SSIZE_T |
| #define read _read /* Prevent POSIX deprecation warnings */ |
| #endif |
| #else |
| #ifdef LIBVNCSERVER_HAVE_SYS_TIME_H |
| #include <sys/time.h> |
| #endif |
| #ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| #ifdef LIBVNCSERVER_HAVE_NETINET_IN_H |
| #include <netinet/in.h> |
| #include <netinet/tcp.h> |
| #include <netdb.h> |
| #include <arpa/inet.h> |
| #endif |
| #include <pwd.h> |
| #endif |
| |
| #ifdef USE_LIBWRAP |
| #include <tcpd.h> |
| #endif |
| |
| |
| #define NOT_FOUND_STR "HTTP/1.0 404 Not found\r\nConnection: close\r\n\r\n" \ |
| "<HEAD><TITLE>File Not Found</TITLE></HEAD>\n" \ |
| "<BODY><H1>File Not Found</H1></BODY>\n" |
| |
| #define INVALID_REQUEST_STR "HTTP/1.0 400 Invalid Request\r\nConnection: close\r\n\r\n" \ |
| "<HEAD><TITLE>Invalid Request</TITLE></HEAD>\n" \ |
| "<BODY><H1>Invalid request</H1></BODY>\n" |
| |
| #define OK_STR "HTTP/1.0 200 OK\r\nConnection: close\r\n\r\n" |
| #define OK_STR_HTML "HTTP/1.0 200 OK\r\nConnection: close\r\nContent-Type: text/html\r\n\r\n" |
| |
| |
| |
| static void httpProcessInput(rfbScreenInfoPtr screen); |
| static rfbBool compareAndSkip(char **ptr, const char *str); |
| static rfbBool parseParams(const char *request, char *result, int max_bytes); |
| static rfbBool validateString(char *str); |
| |
| #define BUF_SIZE 32768 |
| |
| static char buf[BUF_SIZE]; |
| static size_t buf_filled=0; |
| |
| /* |
| * httpInitSockets sets up the TCP socket to listen for HTTP connections. |
| */ |
| |
| void |
| rfbHttpInitSockets(rfbScreenInfoPtr rfbScreen) |
| { |
| if (rfbScreen->httpInitDone) |
| return; |
| |
| rfbScreen->httpInitDone = TRUE; |
| |
| if (!rfbScreen->httpDir) |
| return; |
| |
| if (rfbScreen->httpPort == 0) { |
| rfbScreen->httpPort = rfbScreen->port-100; |
| } |
| |
| if ((rfbScreen->httpListenSock = |
| rfbListenOnTCPPort(rfbScreen->httpPort, rfbScreen->listenInterface)) < 0) { |
| rfbLogPerror("ListenOnTCPPort"); |
| return; |
| } |
| rfbLog("Listening for HTTP connections on TCP port %d\n", rfbScreen->httpPort); |
| rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->httpPort); |
| |
| #ifdef LIBVNCSERVER_IPv6 |
| if (rfbScreen->http6Port == 0) { |
| rfbScreen->http6Port = rfbScreen->ipv6port-100; |
| } |
| |
| if ((rfbScreen->httpListen6Sock |
| = rfbListenOnTCP6Port(rfbScreen->http6Port, rfbScreen->listen6Interface)) < 0) { |
| /* ListenOnTCP6Port has its own detailed error printout */ |
| return; |
| } |
| rfbLog("Listening for HTTP connections on TCP6 port %d\n", rfbScreen->http6Port); |
| rfbLog(" URL http://%s:%d\n",rfbScreen->thisHost,rfbScreen->http6Port); |
| #endif |
| } |
| |
| void rfbHttpShutdownSockets(rfbScreenInfoPtr rfbScreen) { |
| if(rfbScreen->httpSock>-1) { |
| close(rfbScreen->httpSock); |
| FD_CLR(rfbScreen->httpSock,&rfbScreen->allFds); |
| rfbScreen->httpSock=-1; |
| } |
| |
| if(rfbScreen->httpListenSock>-1) { |
| close(rfbScreen->httpListenSock); |
| FD_CLR(rfbScreen->httpListenSock,&rfbScreen->allFds); |
| rfbScreen->httpListenSock=-1; |
| } |
| |
| if(rfbScreen->httpListen6Sock>-1) { |
| close(rfbScreen->httpListen6Sock); |
| FD_CLR(rfbScreen->httpListen6Sock,&rfbScreen->allFds); |
| rfbScreen->httpListen6Sock=-1; |
| } |
| } |
| |
| /* |
| * httpCheckFds is called from ProcessInputEvents to check for input on the |
| * HTTP socket(s). If there is input to process, httpProcessInput is called. |
| */ |
| |
| void |
| rfbHttpCheckFds(rfbScreenInfoPtr rfbScreen) |
| { |
| int nfds; |
| fd_set fds; |
| struct timeval tv; |
| #ifdef LIBVNCSERVER_IPv6 |
| struct sockaddr_storage addr; |
| #else |
| struct sockaddr_in addr; |
| #endif |
| socklen_t addrlen = sizeof(addr); |
| |
| if (!rfbScreen->httpDir) |
| return; |
| |
| if (rfbScreen->httpListenSock < 0) |
| return; |
| |
| FD_ZERO(&fds); |
| FD_SET(rfbScreen->httpListenSock, &fds); |
| if (rfbScreen->httpListen6Sock >= 0) { |
| FD_SET(rfbScreen->httpListen6Sock, &fds); |
| } |
| if (rfbScreen->httpSock >= 0) { |
| FD_SET(rfbScreen->httpSock, &fds); |
| } |
| tv.tv_sec = 0; |
| tv.tv_usec = 0; |
| nfds = select(max(rfbScreen->httpListen6Sock, max(rfbScreen->httpSock,rfbScreen->httpListenSock)) + 1, &fds, NULL, NULL, &tv); |
| if (nfds == 0) { |
| return; |
| } |
| if (nfds < 0) { |
| #ifdef WIN32 |
| errno = WSAGetLastError(); |
| #endif |
| if (errno != EINTR) |
| rfbLogPerror("httpCheckFds: select"); |
| return; |
| } |
| |
| if ((rfbScreen->httpSock >= 0) && FD_ISSET(rfbScreen->httpSock, &fds)) { |
| httpProcessInput(rfbScreen); |
| } |
| |
| if (FD_ISSET(rfbScreen->httpListenSock, &fds) || FD_ISSET(rfbScreen->httpListen6Sock, &fds)) { |
| if (rfbScreen->httpSock >= 0) close(rfbScreen->httpSock); |
| |
| if(FD_ISSET(rfbScreen->httpListenSock, &fds)) { |
| if ((rfbScreen->httpSock = accept(rfbScreen->httpListenSock, (struct sockaddr *)&addr, &addrlen)) < 0) { |
| rfbLogPerror("httpCheckFds: accept"); |
| return; |
| } |
| } |
| else if(FD_ISSET(rfbScreen->httpListen6Sock, &fds)) { |
| if ((rfbScreen->httpSock = accept(rfbScreen->httpListen6Sock, (struct sockaddr *)&addr, &addrlen)) < 0) { |
| rfbLogPerror("httpCheckFds: accept"); |
| return; |
| } |
| } |
| |
| #ifdef USE_LIBWRAP |
| char host[1024]; |
| #ifdef LIBVNCSERVER_IPv6 |
| if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) { |
| rfbLogPerror("httpCheckFds: error in getnameinfo"); |
| host[0] = '\0'; |
| } |
| #else |
| memcpy(host, inet_ntoa(addr.sin_addr), sizeof(host)); |
| #endif |
| if(!hosts_ctl("vnc",STRING_UNKNOWN, host, |
| STRING_UNKNOWN)) { |
| rfbLog("Rejected HTTP connection from client %s\n", |
| host); |
| close(rfbScreen->httpSock); |
| rfbScreen->httpSock=-1; |
| return; |
| } |
| #endif |
| if(!rfbSetNonBlocking(rfbScreen->httpSock)) { |
| close(rfbScreen->httpSock); |
| rfbScreen->httpSock=-1; |
| return; |
| } |
| /*AddEnabledDevice(httpSock);*/ |
| } |
| } |
| |
| |
| static void |
| httpCloseSock(rfbScreenInfoPtr rfbScreen) |
| { |
| close(rfbScreen->httpSock); |
| rfbScreen->httpSock = -1; |
| buf_filled = 0; |
| } |
| |
| static rfbClientRec cl; |
| |
| /* |
| * httpProcessInput is called when input is received on the HTTP socket. |
| */ |
| |
| static void |
| httpProcessInput(rfbScreenInfoPtr rfbScreen) |
| { |
| #ifdef LIBVNCSERVER_IPv6 |
| struct sockaddr_storage addr; |
| #else |
| struct sockaddr_in addr; |
| #endif |
| socklen_t addrlen = sizeof(addr); |
| char fullFname[512]; |
| char params[1024]; |
| char *ptr; |
| char *fname; |
| unsigned int maxFnameLen; |
| FILE* fd; |
| rfbBool performSubstitutions = FALSE; |
| char str[256+32]; |
| #ifndef WIN32 |
| char* user=getenv("USER"); |
| #endif |
| |
| cl.sock=rfbScreen->httpSock; |
| |
| if (strlen(rfbScreen->httpDir) > 255) { |
| rfbErr("-httpd directory too long\n"); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| strcpy(fullFname, rfbScreen->httpDir); |
| fname = &fullFname[strlen(fullFname)]; |
| maxFnameLen = 511 - strlen(fullFname); |
| |
| buf_filled=0; |
| |
| /* Read data from the HTTP client until we get a complete request. */ |
| while (1) { |
| ssize_t got; |
| |
| if (buf_filled > sizeof (buf)) { |
| rfbErr("httpProcessInput: HTTP request is too long\n"); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| got = read (rfbScreen->httpSock, buf + buf_filled, |
| sizeof (buf) - buf_filled - 1); |
| |
| if (got <= 0) { |
| if (got == 0) { |
| rfbErr("httpd: premature connection close\n"); |
| } else { |
| #ifdef WIN32 |
| errno=WSAGetLastError(); |
| #endif |
| if (errno == EAGAIN) { |
| return; |
| } |
| rfbLogPerror("httpProcessInput: read"); |
| } |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| buf_filled += got; |
| buf[buf_filled] = '\0'; |
| |
| /* Is it complete yet (is there a blank line)? */ |
| if (strstr (buf, "\r\r") || strstr (buf, "\n\n") || |
| strstr (buf, "\r\n\r\n") || strstr (buf, "\n\r\n\r")) |
| break; |
| } |
| |
| |
| /* Process the request. */ |
| if(rfbScreen->httpEnableProxyConnect) { |
| const static char* PROXY_OK_STR = "HTTP/1.0 200 OK\r\nContent-Type: octet-stream\r\nPragma: no-cache\r\n\r\n"; |
| if(!strncmp(buf, "CONNECT ", 8)) { |
| if(atoi(strchr(buf, ':')+1)!=rfbScreen->port) { |
| rfbErr("httpd: CONNECT format invalid.\n"); |
| rfbWriteExact(&cl,INVALID_REQUEST_STR, strlen(INVALID_REQUEST_STR)); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| /* proxy connection */ |
| rfbLog("httpd: client asked for CONNECT\n"); |
| rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR)); |
| rfbNewClientConnection(rfbScreen,rfbScreen->httpSock); |
| rfbScreen->httpSock = -1; |
| return; |
| } |
| if (!strncmp(buf, "GET ",4) && !strncmp(strchr(buf,'/'),"/proxied.connection HTTP/1.", 27)) { |
| /* proxy connection */ |
| rfbLog("httpd: client asked for /proxied.connection\n"); |
| rfbWriteExact(&cl,PROXY_OK_STR,strlen(PROXY_OK_STR)); |
| rfbNewClientConnection(rfbScreen,rfbScreen->httpSock); |
| rfbScreen->httpSock = -1; |
| return; |
| } |
| } |
| |
| if (strncmp(buf, "GET ", 4)) { |
| rfbErr("httpd: no GET line\n"); |
| httpCloseSock(rfbScreen); |
| return; |
| } else { |
| /* Only use the first line. */ |
| buf[strcspn(buf, "\n\r")] = '\0'; |
| } |
| |
| if (strlen(buf) > maxFnameLen) { |
| rfbErr("httpd: GET line too long\n"); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| if (sscanf(buf, "GET %s HTTP/1.", fname) != 1) { |
| rfbErr("httpd: couldn't parse GET line\n"); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| if (fname[0] != '/') { |
| rfbErr("httpd: filename didn't begin with '/'\n"); |
| rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR)); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| |
| getpeername(rfbScreen->httpSock, (struct sockaddr *)&addr, &addrlen); |
| #ifdef LIBVNCSERVER_IPv6 |
| { |
| char host[1024]; |
| if(getnameinfo((struct sockaddr*)&addr, addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0) { |
| rfbLogPerror("httpProcessInput: error in getnameinfo"); |
| } |
| rfbLog("httpd: get '%s' for %s\n", fname+1, host); |
| } |
| #else |
| rfbLog("httpd: get '%s' for %s\n", fname+1, |
| inet_ntoa(addr.sin_addr)); |
| #endif |
| |
| /* Extract parameters from the URL string if necessary */ |
| |
| params[0] = '\0'; |
| ptr = strchr(fname, '?'); |
| if (ptr != NULL) { |
| *ptr = '\0'; |
| if (!parseParams(&ptr[1], params, 1024)) { |
| params[0] = '\0'; |
| rfbErr("httpd: bad parameters in the URL\n"); |
| } |
| } |
| |
| |
| /* If we were asked for '/', actually read the file index.vnc */ |
| |
| if (strcmp(fname, "/") == 0) { |
| strcpy(fname, "/index.vnc"); |
| rfbLog("httpd: defaulting to '%s'\n", fname+1); |
| } |
| |
| /* Substitutions are performed on files ending .vnc */ |
| |
| if (strlen(fname) >= 4 && strcmp(&fname[strlen(fname)-4], ".vnc") == 0) { |
| performSubstitutions = TRUE; |
| } |
| |
| /* Open the file */ |
| |
| if ((fd = fopen(fullFname, "r")) == 0) { |
| rfbLogPerror("httpProcessInput: open"); |
| rfbWriteExact(&cl, NOT_FOUND_STR, strlen(NOT_FOUND_STR)); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| if(performSubstitutions) /* is the 'index.vnc' file */ |
| rfbWriteExact(&cl, OK_STR_HTML, strlen(OK_STR_HTML)); |
| else |
| rfbWriteExact(&cl, OK_STR, strlen(OK_STR)); |
| |
| while (1) { |
| int n = fread(buf, 1, BUF_SIZE-1, fd); |
| if (n < 0) { |
| rfbLogPerror("httpProcessInput: read"); |
| fclose(fd); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| |
| if (n == 0) |
| break; |
| |
| if (performSubstitutions) { |
| |
| /* Substitute $WIDTH, $HEIGHT, etc with the appropriate values. |
| This won't quite work properly if the .vnc file is longer than |
| BUF_SIZE, but it's reasonable to assume that .vnc files will |
| always be short. */ |
| |
| char *ptr = buf; |
| char *dollar; |
| buf[n] = 0; /* make sure it's null-terminated */ |
| |
| while ((dollar = strchr(ptr, '$'))!=NULL) { |
| rfbWriteExact(&cl, ptr, (dollar - ptr)); |
| |
| ptr = dollar; |
| |
| if (compareAndSkip(&ptr, "$WIDTH")) { |
| |
| sprintf(str, "%d", rfbScreen->width); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$HEIGHT")) { |
| |
| sprintf(str, "%d", rfbScreen->height); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$APPLETWIDTH")) { |
| |
| sprintf(str, "%d", rfbScreen->width); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$APPLETHEIGHT")) { |
| |
| sprintf(str, "%d", rfbScreen->height + 32); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$PORT")) { |
| |
| sprintf(str, "%d", rfbScreen->port); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$DESKTOP")) { |
| |
| rfbWriteExact(&cl, rfbScreen->desktopName, strlen(rfbScreen->desktopName)); |
| |
| } else if (compareAndSkip(&ptr, "$DISPLAY")) { |
| |
| sprintf(str, "%s:%d", rfbScreen->thisHost, rfbScreen->port-5900); |
| rfbWriteExact(&cl, str, strlen(str)); |
| |
| } else if (compareAndSkip(&ptr, "$USER")) { |
| #ifndef WIN32 |
| if (user) { |
| rfbWriteExact(&cl, user, |
| strlen(user)); |
| } else |
| #endif |
| rfbWriteExact(&cl, "?", 1); |
| } else if (compareAndSkip(&ptr, "$PARAMS")) { |
| if (params[0] != '\0') |
| rfbWriteExact(&cl, params, strlen(params)); |
| } else { |
| if (!compareAndSkip(&ptr, "$$")) |
| ptr++; |
| |
| if (rfbWriteExact(&cl, "$", 1) < 0) { |
| fclose(fd); |
| httpCloseSock(rfbScreen); |
| return; |
| } |
| } |
| } |
| if (rfbWriteExact(&cl, ptr, (&buf[n] - ptr)) < 0) |
| break; |
| |
| } else { |
| |
| /* For files not ending .vnc, just write out the buffer */ |
| |
| if (rfbWriteExact(&cl, buf, n) < 0) |
| break; |
| } |
| } |
| |
| fclose(fd); |
| httpCloseSock(rfbScreen); |
| } |
| |
| |
| static rfbBool |
| compareAndSkip(char **ptr, const char *str) |
| { |
| if (strncmp(*ptr, str, strlen(str)) == 0) { |
| *ptr += strlen(str); |
| return TRUE; |
| } |
| |
| return FALSE; |
| } |
| |
| /* |
| * Parse the request tail after the '?' character, and format a sequence |
| * of <param> tags for inclusion into an HTML page with embedded applet. |
| */ |
| |
| static rfbBool |
| parseParams(const char *request, char *result, int max_bytes) |
| { |
| char param_request[128]; |
| char param_formatted[196]; |
| const char *tail; |
| char *delim_ptr; |
| char *value_str; |
| int cur_bytes, len; |
| |
| result[0] = '\0'; |
| cur_bytes = 0; |
| |
| tail = request; |
| for (;;) { |
| /* Copy individual "name=value" string into a buffer */ |
| delim_ptr = strchr((char *)tail, '&'); |
| if (delim_ptr == NULL) { |
| if (strlen(tail) >= sizeof(param_request)) { |
| return FALSE; |
| } |
| strcpy(param_request, tail); |
| } else { |
| len = delim_ptr - tail; |
| if (len >= sizeof(param_request)) { |
| return FALSE; |
| } |
| memcpy(param_request, tail, len); |
| param_request[len] = '\0'; |
| } |
| |
| /* Split the request into parameter name and value */ |
| value_str = strchr(¶m_request[1], '='); |
| if (value_str == NULL) { |
| return FALSE; |
| } |
| *value_str++ = '\0'; |
| if (strlen(value_str) == 0) { |
| return FALSE; |
| } |
| |
| /* Validate both parameter name and value */ |
| if (!validateString(param_request) || !validateString(value_str)) { |
| return FALSE; |
| } |
| |
| /* Prepare HTML-formatted representation of the name=value pair */ |
| len = sprintf(param_formatted, |
| "<PARAM NAME=\"%s\" VALUE=\"%s\">\n", |
| param_request, value_str); |
| if (cur_bytes + len + 1 > max_bytes) { |
| return FALSE; |
| } |
| strcat(result, param_formatted); |
| cur_bytes += len; |
| |
| /* Go to the next parameter */ |
| if (delim_ptr == NULL) { |
| break; |
| } |
| tail = delim_ptr + 1; |
| } |
| return TRUE; |
| } |
| |
| /* |
| * Check if the string consists only of alphanumeric characters, '+' |
| * signs, underscores, dots, colons and square brackets. |
| * Replace all '+' signs with spaces. |
| */ |
| |
| static rfbBool |
| validateString(char *str) |
| { |
| char *ptr; |
| |
| for (ptr = str; *ptr != '\0'; ptr++) { |
| if (!isalnum(*ptr) && *ptr != '_' && *ptr != '.' |
| && *ptr != ':' && *ptr != '[' && *ptr != ']' ) { |
| if (*ptr == '+') { |
| *ptr = ' '; |
| } else { |
| return FALSE; |
| } |
| } |
| } |
| return TRUE; |
| } |
| |