Clean up warnings in stubs.cpp.
Switch to C++ to get extra warnings, and format the code Google style.
Change-Id: Ifc0131bf297a6ee8a8a6b8d049a02518b0b1a4b7
diff --git a/libc/Android.mk b/libc/Android.mk
index 26da523..d0c9218 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -292,7 +292,7 @@
bionic/sched_cpucount.c \
bionic/semaphore.c \
bionic/sha1.c \
- bionic/stubs.c \
+ bionic/stubs.cpp \
bionic/system_properties.c \
bionic/tdelete.c \
bionic/tdestroy.c \
diff --git a/libc/bionic/stubs.c b/libc/bionic/stubs.c
deleted file mode 100644
index d140890..0000000
--- a/libc/bionic/stubs.c
+++ /dev/null
@@ -1,525 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <ctype.h>
-#include <errno.h>
-#include <grp.h>
-#include <mntent.h>
-#include <netdb.h>
-#include <private/android_filesystem_config.h>
-#include <private/logd.h>
-#include <pthread.h>
-#include <pwd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-static int do_getpw_r(int by_name, const char* name, uid_t uid,
- struct passwd* dst, char* buf, size_t byte_count, struct passwd** result)
-{
- /*
- * getpwnam_r and getpwuid_r don't modify errno, but library calls we
- * make might.
- */
- int old_errno = errno;
- int rc = 0;
- *result = NULL;
-
- const struct passwd* src = by_name ? getpwnam(name) : getpwuid(uid);
-
- /*
- * POSIX allows failure to find a match to be considered a non-error.
- * Reporting success (0) but with *result NULL is glibc's behavior.
- */
- if (src == NULL) {
- rc = (errno == ENOENT) ? 0 : errno;
- goto failure;
- }
-
- /*
- * Work out where our strings will go in 'buf', and whether we've got
- * enough space.
- */
- size_t required_byte_count = 0;
- dst->pw_name = buf;
- required_byte_count += strlen(src->pw_name) + 1;
- dst->pw_dir = buf + required_byte_count;
- required_byte_count += strlen(src->pw_dir) + 1;
- dst->pw_shell = buf + required_byte_count;
- required_byte_count += strlen(src->pw_shell) + 1;
- if (byte_count < required_byte_count) {
- rc = ERANGE;
- goto failure;
- }
-
- /* Copy the strings. */
- snprintf(buf, byte_count, "%s%c%s%c%s",
- src->pw_name, 0, src->pw_dir, 0, src->pw_shell);
-
- /*
- * pw_passwd is non-POSIX and unused (always NULL) in bionic.
- * pw_gecos is non-POSIX and missing in bionic.
- */
- dst->pw_passwd = NULL;
-
- /* Copy the integral fields. */
- dst->pw_gid = src->pw_gid;
- dst->pw_uid = src->pw_uid;
-
-success:
- rc = 0;
- *result = dst;
-failure:
- errno = old_errno;
- return rc;
-}
-
-int getpwnam_r(const char* name, struct passwd* pwd,
- char* buf, size_t byte_count, struct passwd** result)
-{
- return do_getpw_r(1, name, -1, pwd, buf, byte_count, result);
-}
-
-int getpwuid_r(uid_t uid, struct passwd* pwd,
- char* buf, size_t byte_count, struct passwd** result)
-{
- return do_getpw_r(0, NULL, uid, pwd, buf, byte_count, result);
-}
-
-/** Thread-specific state for the stubs functions
- **/
-
-static pthread_once_t the_once = PTHREAD_ONCE_INIT;
-static pthread_key_t the_key;
-
-typedef struct {
- struct passwd passwd;
- struct group group;
- char* group_members[2];
- char app_name_buffer[32];
- char group_name_buffer[32];
-} stubs_state_t;
-
-static void
-stubs_state_free( void* _s )
-{
- stubs_state_t* s = _s;
- free(s);
-}
-
-static stubs_state_t*
-stubs_state_alloc( void )
-{
- stubs_state_t* s = calloc(1, sizeof *s);
-
- if (s != NULL) {
- s->group.gr_mem = s->group_members;
- }
- return s;
-}
-
-static void __stubs_key_init(void)
-{
- pthread_key_create( &the_key, stubs_state_free );
-}
-
-static stubs_state_t*
-__stubs_state(void)
-{
- stubs_state_t* s;
-
- pthread_once(&the_once, __stubs_key_init);
- s = pthread_getspecific(the_key);
- if (s == NULL) {
- s = stubs_state_alloc();
- if (s == NULL) {
- errno = ENOMEM; /* just in case */
- } else {
- if ( pthread_setspecific(the_key, s) != 0 ) {
- stubs_state_free(s);
- errno = ENOMEM;
- s = NULL;
- }
- }
- }
- return s;
-}
-
-static struct passwd*
-android_iinfo_to_passwd( struct passwd *pw,
- struct android_id_info *iinfo )
-{
- pw->pw_name = (char*)iinfo->name;
- pw->pw_uid = iinfo->aid;
- pw->pw_gid = iinfo->aid;
- pw->pw_dir = "/";
- pw->pw_shell = "/system/bin/sh";
- return pw;
-}
-
-static struct group*
-android_iinfo_to_group( struct group *gr,
- struct android_id_info *iinfo )
-{
- gr->gr_name = (char*) iinfo->name;
- gr->gr_gid = iinfo->aid;
- gr->gr_mem[0] = gr->gr_name;
- gr->gr_mem[1] = NULL;
- return gr;
-}
-
-static struct passwd *
-android_id_to_passwd( struct passwd *pw, unsigned id)
-{
- struct android_id_info *iinfo = android_ids;
- unsigned n;
- for (n = 0; n < android_id_count; n++) {
- if (iinfo[n].aid == id) {
- return android_iinfo_to_passwd(pw, iinfo + n);
- }
- }
- return NULL;
-}
-
-static struct passwd*
-android_name_to_passwd(struct passwd *pw, const char *name)
-{
- struct android_id_info *iinfo = android_ids;
- unsigned n;
- for (n = 0; n < android_id_count; n++) {
- if (!strcmp(iinfo[n].name, name)) {
- return android_iinfo_to_passwd(pw, iinfo + n);
- }
- }
- return NULL;
-}
-
-static struct group*
-android_id_to_group( struct group *gr, unsigned id )
-{
- struct android_id_info *iinfo = android_ids;
- unsigned n;
- for (n = 0; n < android_id_count; n++) {
- if (iinfo[n].aid == id) {
- return android_iinfo_to_group(gr, iinfo + n);
- }
- }
- return NULL;
-}
-
-static struct group*
-android_name_to_group( struct group *gr, const char *name )
-{
- struct android_id_info *iinfo = android_ids;
- unsigned n;
- for (n = 0; n < android_id_count; n++) {
- if (!strcmp(iinfo[n].name, name)) {
- return android_iinfo_to_group(gr, iinfo + n);
- }
- }
- return NULL;
-}
-
-/* translate a user/group name to the corresponding user/group id.
- * u0_a1234 -> 0 * AID_USER + AID_APP + 1234
- * u2_i1000 -> 2 * AID_USER + AID_ISOLATED_START + 1000
- * u1_system -> 1 * AID_USER + android_ids['system']
- * returns 0 and sets errno to ENOENT in case of error
- */
-static unsigned
-app_id_from_name( const char* name )
-{
- unsigned long userid;
- unsigned long appid = 0;
- char* end;
-
- if (name[0] != 'u' || !isdigit(name[1]))
- goto FAIL;
-
- userid = strtoul(name+1, &end, 10);
- if (end[0] != '_' || end[1] == 0)
- goto FAIL;
-
- if (end[1] == 'a' && isdigit(end[2])) {
- /* end will point to \0 if the strtoul below succeeds. */
- appid = strtoul(end+2, &end, 10) + AID_APP;
- } else if (end[1] == 'i' && isdigit(end[2])) {
- /* end will point to \0 if the strtoul below succeeds. */
- appid = strtoul(end+2, &end, 10) + AID_ISOLATED_START;
- } else {
- for (size_t n = 0; n < android_id_count; n++) {
- if (!strcmp(android_ids[n].name, end + 1)) {
- appid = android_ids[n].aid;
- /* move the end pointer to the null terminator */
- end += 1 + strlen(android_ids[n].name);
- }
- }
- }
-
- /* check if the entire string was consumed by the 3 cases above */
- if (end[0] != 0)
- goto FAIL;
-
- /* check that user id won't overflow */
- if (userid > 1000)
- goto FAIL;
-
- /* check that app id is within range */
- if (appid >= AID_USER)
- goto FAIL;
-
- return (unsigned)(appid + userid*AID_USER);
-
-FAIL:
- errno = ENOENT;
- return 0;
-}
-
-static void
-print_app_uid_name(uid_t uid, char* buffer, int bufferlen)
-{
- uid_t appid;
- uid_t userid;
-
- appid = uid % AID_USER;
- userid = uid / AID_USER;
-
- if (appid < AID_ISOLATED_START) {
- if (appid < AID_APP) {
- for (size_t n = 0; n < android_id_count; n++) {
- if (android_ids[n].aid == appid) {
- snprintf(buffer, bufferlen, "u%u_%s", userid, android_ids[n].name);
- return;
- }
- }
- }
- snprintf(buffer, bufferlen, "u%u_a%u", userid, appid - AID_APP);
- } else {
- snprintf(buffer, bufferlen, "u%u_i%u", userid, appid - AID_ISOLATED_START);
- }
-}
-
-/* translate a uid into the corresponding name.
- * 0 to AID_APP-1 -> "system", "radio", etc.
- * AID_APP to AID_ISOLATED_START-1 -> u0_a1234
- * AID_ISOLATED_START to AID_USER-1 -> u0_i1234
- * AID_USER+ -> u1_radio, u1_a1234, u2_i1234, etc.
- * returns a passwd structure (sets errno to ENOENT on failure)
- */
-static struct passwd*
-app_id_to_passwd(uid_t uid, stubs_state_t* state)
-{
- struct passwd* pw = &state->passwd;
-
- if (uid < AID_APP) {
- errno = ENOENT;
- return NULL;
- }
-
- print_app_uid_name(uid, state->app_name_buffer, sizeof state->app_name_buffer);
-
- pw->pw_name = state->app_name_buffer;
- pw->pw_dir = "/data";
- pw->pw_shell = "/system/bin/sh";
- pw->pw_uid = uid;
- pw->pw_gid = uid;
-
- return pw;
-}
-
-/* translate a gid into the corresponding app_<gid>
- * group structure (sets errno to ENOENT on failure)
- */
-static struct group*
-app_id_to_group(gid_t gid, stubs_state_t* state)
-{
- struct group* gr = &state->group;
- int appid;
- int userid;
-
- if (gid < AID_APP) {
- errno = ENOENT;
- return NULL;
- }
-
- print_app_uid_name(gid, state->group_name_buffer, sizeof state->group_name_buffer);
-
- gr->gr_name = state->group_name_buffer;
- gr->gr_gid = gid;
- gr->gr_mem[0] = gr->gr_name;
- gr->gr_mem[1] = NULL;
-
- return gr;
-}
-
-
-struct passwd*
-getpwuid(uid_t uid)
-{
- stubs_state_t* state = __stubs_state();
- struct passwd* pw;
-
- if (state == NULL)
- return NULL;
-
- pw = &state->passwd;
-
- if ( android_id_to_passwd(pw, uid) != NULL )
- return pw;
-
- return app_id_to_passwd(uid, state);
-}
-
-struct passwd*
-getpwnam(const char *login)
-{
- stubs_state_t* state = __stubs_state();
-
- if (state == NULL)
- return NULL;
-
- if (android_name_to_passwd(&state->passwd, login) != NULL)
- return &state->passwd;
-
- return app_id_to_passwd( app_id_from_name(login), state );
-}
-
-int
-getgrouplist (const char *user, gid_t group,
- gid_t *groups, int *ngroups)
-{
- if (*ngroups < 1) {
- *ngroups = 1;
- return -1;
- }
- groups[0] = group;
- return (*ngroups = 1);
-}
-
-char*
-getlogin(void)
-{
- struct passwd *pw = getpwuid(getuid());
-
- if(pw) {
- return pw->pw_name;
- } else {
- return NULL;
- }
-}
-
-struct group*
-getgrgid(gid_t gid)
-{
- stubs_state_t* state = __stubs_state();
- struct group* gr;
-
- if (state == NULL)
- return NULL;
-
- gr = android_id_to_group(&state->group, gid);
- if (gr != NULL)
- return gr;
-
- return app_id_to_group(gid, state);
-}
-
-struct group*
-getgrnam(const char *name)
-{
- stubs_state_t* state = __stubs_state();
- unsigned id;
-
- if (state == NULL)
- return NULL;
-
- if (android_name_to_group(&state->group, name) != 0)
- return &state->group;
-
- return app_id_to_group( app_id_from_name(name), state );
-}
-
-static void unimplemented_stub(const char* function) {
- const char* fmt = "%s(3) is not implemented on Android\n";
- __libc_android_log_print(ANDROID_LOG_WARN, "libc", fmt, function);
- fprintf(stderr, fmt, function);
-}
-
-#define UNIMPLEMENTED unimplemented_stub(__PRETTY_FUNCTION__)
-
-struct netent* getnetbyname(const char* name) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-void endpwent(void) {
- UNIMPLEMENTED;
-}
-
-struct mntent* getmntent(FILE* f) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-char* ttyname(int fd) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-int ttyname_r(int fd, char* buf, size_t buflen) {
- UNIMPLEMENTED;
- return -ERANGE;
-}
-
-struct netent* getnetbyaddr(uint32_t net, int type) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-struct protoent* getprotobyname(const char* name) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-struct protoent* getprotobynumber(int proto) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-char* getusershell(void) {
- UNIMPLEMENTED;
- return NULL;
-}
-
-void setusershell(void) {
- UNIMPLEMENTED;
-}
-
-void endusershell(void) {
- UNIMPLEMENTED;
-}
diff --git a/libc/bionic/stubs.cpp b/libc/bionic/stubs.cpp
new file mode 100644
index 0000000..652e522
--- /dev/null
+++ b/libc/bionic/stubs.cpp
@@ -0,0 +1,461 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+#include <errno.h>
+#include <grp.h>
+#include <mntent.h>
+#include <netdb.h>
+#include <private/android_filesystem_config.h>
+#include <private/logd.h>
+#include <pthread.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+// Thread-specific state for the non-reentrant functions.
+static pthread_once_t stubs_once = PTHREAD_ONCE_INIT;
+static pthread_key_t stubs_key;
+struct stubs_state_t {
+ passwd passwd_;
+ group group_;
+ char* group_members_[2];
+ char app_name_buffer_[32];
+ char group_name_buffer_[32];
+ char dir_buffer_[32];
+ char sh_buffer_[32];
+};
+
+static int do_getpw_r(int by_name, const char* name, uid_t uid,
+ passwd* dst, char* buf, size_t byte_count,
+ passwd** result) {
+ // getpwnam_r and getpwuid_r don't modify errno, but library calls we
+ // make might.
+ int old_errno = errno;
+ *result = NULL;
+
+ // Our implementation of getpwnam(3) and getpwuid(3) use thread-local
+ // storage, so we can call them as long as we copy everything out
+ // before returning.
+ const passwd* src = by_name ? getpwnam(name) : getpwuid(uid); // NOLINT: see above.
+
+ // POSIX allows failure to find a match to be considered a non-error.
+ // Reporting success (0) but with *result NULL is glibc's behavior.
+ if (src == NULL) {
+ int rc = (errno == ENOENT) ? 0 : errno;
+ errno = old_errno;
+ return rc;
+ }
+
+ // Work out where our strings will go in 'buf', and whether we've got
+ // enough space.
+ size_t required_byte_count = 0;
+ dst->pw_name = buf;
+ required_byte_count += strlen(src->pw_name) + 1;
+ dst->pw_dir = buf + required_byte_count;
+ required_byte_count += strlen(src->pw_dir) + 1;
+ dst->pw_shell = buf + required_byte_count;
+ required_byte_count += strlen(src->pw_shell) + 1;
+ if (byte_count < required_byte_count) {
+ errno = old_errno;
+ return ERANGE;
+ }
+
+ // Copy the strings.
+ snprintf(buf, byte_count, "%s%c%s%c%s",
+ src->pw_name, 0, src->pw_dir, 0, src->pw_shell);
+
+ // pw_passwd is non-POSIX and unused (always NULL) in bionic.
+ // pw_gecos is non-POSIX and missing in bionic.
+ dst->pw_passwd = NULL;
+
+ // Copy the integral fields.
+ dst->pw_gid = src->pw_gid;
+ dst->pw_uid = src->pw_uid;
+
+ *result = dst;
+ errno = old_errno;
+ return 0;
+}
+
+int getpwnam_r(const char* name, passwd* pwd,
+ char* buf, size_t byte_count, passwd** result) {
+ return do_getpw_r(1, name, -1, pwd, buf, byte_count, result);
+}
+
+int getpwuid_r(uid_t uid, passwd* pwd,
+ char* buf, size_t byte_count, passwd** result) {
+ return do_getpw_r(0, NULL, uid, pwd, buf, byte_count, result);
+}
+
+static stubs_state_t* stubs_state_alloc() {
+ stubs_state_t* s = reinterpret_cast<stubs_state_t*>(calloc(1, sizeof(*s)));
+ if (s != NULL) {
+ s->group_.gr_mem = s->group_members_;
+ }
+ return s;
+}
+
+static void stubs_state_free(void* ptr) {
+ stubs_state_t* state = reinterpret_cast<stubs_state_t*>(ptr);
+ free(state);
+}
+
+static void __stubs_key_init() {
+ pthread_key_create(&stubs_key, stubs_state_free);
+}
+
+static stubs_state_t* __stubs_state() {
+ pthread_once(&stubs_once, __stubs_key_init);
+ stubs_state_t* s =
+ reinterpret_cast<stubs_state_t*>(pthread_getspecific(stubs_key));
+ if (s == NULL) {
+ s = stubs_state_alloc();
+ if (s == NULL) {
+ errno = ENOMEM; // Just in case.
+ } else {
+ if (pthread_setspecific(stubs_key, s) != 0) {
+ stubs_state_free(s);
+ errno = ENOMEM;
+ s = NULL;
+ }
+ }
+ }
+ return s;
+}
+
+static passwd* android_iinfo_to_passwd(stubs_state_t* state,
+ const android_id_info* iinfo) {
+ snprintf(state->dir_buffer_, sizeof(state->dir_buffer_), "/");
+ snprintf(state->sh_buffer_, sizeof(state->sh_buffer_), "/system/bin/sh");
+
+ passwd* pw = &state->passwd_;
+ pw->pw_name = (char*) iinfo->name;
+ pw->pw_uid = iinfo->aid;
+ pw->pw_gid = iinfo->aid;
+ pw->pw_dir = state->dir_buffer_;
+ pw->pw_shell = state->sh_buffer_;
+ return pw;
+}
+
+static group* android_iinfo_to_group(group* gr,
+ const android_id_info* iinfo) {
+ gr->gr_name = (char*) iinfo->name;
+ gr->gr_gid = iinfo->aid;
+ gr->gr_mem[0] = gr->gr_name;
+ gr->gr_mem[1] = NULL;
+ return gr;
+}
+
+static passwd* android_id_to_passwd(stubs_state_t* state, unsigned id) {
+ for (size_t n = 0; n < android_id_count; ++n) {
+ if (android_ids[n].aid == id) {
+ return android_iinfo_to_passwd(state, android_ids + n);
+ }
+ }
+ return NULL;
+}
+
+static passwd* android_name_to_passwd(stubs_state_t* state, const char* name) {
+ for (size_t n = 0; n < android_id_count; ++n) {
+ if (!strcmp(android_ids[n].name, name)) {
+ return android_iinfo_to_passwd(state, android_ids + n);
+ }
+ }
+ return NULL;
+}
+
+static group* android_id_to_group(group* gr, unsigned id) {
+ for (size_t n = 0; n < android_id_count; ++n) {
+ if (android_ids[n].aid == id) {
+ return android_iinfo_to_group(gr, android_ids + n);
+ }
+ }
+ return NULL;
+}
+
+static group* android_name_to_group(group* gr, const char* name) {
+ for (size_t n = 0; n < android_id_count; ++n) {
+ if (!strcmp(android_ids[n].name, name)) {
+ return android_iinfo_to_group(gr, android_ids + n);
+ }
+ }
+ return NULL;
+}
+
+// Translate a user/group name to the corresponding user/group id.
+// u0_a1234 -> 0 * AID_USER + AID_APP + 1234
+// u2_i1000 -> 2 * AID_USER + AID_ISOLATED_START + 1000
+// u1_system -> 1 * AID_USER + android_ids['system']
+// returns 0 and sets errno to ENOENT in case of error
+static unsigned app_id_from_name(const char* name) {
+ if (name[0] != 'u' || !isdigit(name[1])) {
+ errno = ENOENT;
+ return 0;
+ }
+
+ char* end;
+ unsigned long userid = strtoul(name+1, &end, 10);
+ if (end[0] != '_' || end[1] == 0) {
+ errno = ENOENT;
+ return 0;
+ }
+
+ unsigned long appid = 0;
+ if (end[1] == 'a' && isdigit(end[2])) {
+ // end will point to \0 if the strtoul below succeeds.
+ appid = strtoul(end+2, &end, 10) + AID_APP;
+ } else if (end[1] == 'i' && isdigit(end[2])) {
+ // end will point to \0 if the strtoul below succeeds.
+ appid = strtoul(end+2, &end, 10) + AID_ISOLATED_START;
+ } else {
+ for (size_t n = 0; n < android_id_count; n++) {
+ if (!strcmp(android_ids[n].name, end + 1)) {
+ appid = android_ids[n].aid;
+ // Move the end pointer to the null terminator.
+ end += strlen(android_ids[n].name) + 1;
+ }
+ }
+ }
+
+ // Check that the entire string was consumed by one of the 3 cases above.
+ if (end[0] != 0) {
+ errno = ENOENT;
+ return 0;
+ }
+
+ // Check that user id won't overflow.
+ if (userid > 1000) {
+ errno = ENOENT;
+ return 0;
+ }
+
+ // Check that app id is within range.
+ if (appid >= AID_USER) {
+ errno = ENOENT;
+ return 0;
+ }
+
+ return (unsigned)(appid + userid*AID_USER);
+}
+
+static void print_app_uid_name(uid_t uid, char* buffer, int bufferlen) {
+ uid_t appid = uid % AID_USER;
+ uid_t userid = uid / AID_USER;
+
+ if (appid < AID_ISOLATED_START) {
+ if (appid < AID_APP) {
+ for (size_t n = 0; n < android_id_count; n++) {
+ if (android_ids[n].aid == appid) {
+ snprintf(buffer, bufferlen, "u%u_%s", userid, android_ids[n].name);
+ return;
+ }
+ }
+ }
+ snprintf(buffer, bufferlen, "u%u_a%u", userid, appid - AID_APP);
+ } else {
+ snprintf(buffer, bufferlen, "u%u_i%u", userid, appid - AID_ISOLATED_START);
+ }
+}
+
+// Translate a uid into the corresponding name.
+// 0 to AID_APP-1 -> "system", "radio", etc.
+// AID_APP to AID_ISOLATED_START-1 -> u0_a1234
+// AID_ISOLATED_START to AID_USER-1 -> u0_i1234
+// AID_USER+ -> u1_radio, u1_a1234, u2_i1234, etc.
+// returns a passwd structure (sets errno to ENOENT on failure).
+static passwd* app_id_to_passwd(uid_t uid, stubs_state_t* state) {
+ passwd* pw = &state->passwd_;
+
+ if (uid < AID_APP) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ print_app_uid_name(uid, state->app_name_buffer_,
+ sizeof(state->app_name_buffer_));
+
+ snprintf(state->dir_buffer_, sizeof(state->dir_buffer_), "/data");
+ snprintf(state->sh_buffer_, sizeof(state->sh_buffer_), "/system/bin/sh");
+
+ pw->pw_name = state->app_name_buffer_;
+ pw->pw_dir = state->dir_buffer_;
+ pw->pw_shell = state->sh_buffer_;
+ pw->pw_uid = uid;
+ pw->pw_gid = uid;
+
+ return pw;
+}
+
+// Translate a gid into the corresponding app_<gid>
+// group structure (sets errno to ENOENT on failure).
+static group* app_id_to_group(gid_t gid, stubs_state_t* state) {
+ if (gid < AID_APP) {
+ errno = ENOENT;
+ return NULL;
+ }
+
+ print_app_uid_name(gid, state->group_name_buffer_,
+ sizeof(state->group_name_buffer_));
+
+ group* gr = &state->group_;
+ gr->gr_name = state->group_name_buffer_;
+ gr->gr_gid = gid;
+ gr->gr_mem[0] = gr->gr_name;
+ gr->gr_mem[1] = NULL;
+ return gr;
+}
+
+
+passwd* getpwuid(uid_t uid) { // NOLINT: implementing bad function.
+ stubs_state_t* state = __stubs_state();
+ if (state == NULL) {
+ return NULL;
+ }
+
+ passwd* pw = android_id_to_passwd(state, uid);
+ if (pw != NULL) {
+ return pw;
+ }
+ return app_id_to_passwd(uid, state);
+}
+
+passwd* getpwnam(const char* login) { // NOLINT: implementing bad function.
+ stubs_state_t* state = __stubs_state();
+ if (state == NULL) {
+ return NULL;
+ }
+
+ passwd* pw = android_name_to_passwd(state, login);
+ if (pw != NULL) {
+ return pw;
+ }
+ return app_id_to_passwd(app_id_from_name(login), state);
+}
+
+int getgrouplist(const char* user, gid_t group, gid_t* groups, int* ngroups) {
+ if (*ngroups < 1) {
+ *ngroups = 1;
+ return -1;
+ }
+ groups[0] = group;
+ return (*ngroups = 1);
+}
+
+char* getlogin() { // NOLINT: implementing bad function.
+ passwd *pw = getpwuid(getuid()); // NOLINT: implementing bad function in terms of bad function.
+ return (pw != NULL) ? pw->pw_name : NULL;
+}
+
+group* getgrgid(gid_t gid) { // NOLINT: implementing bad function.
+ stubs_state_t* state = __stubs_state();
+ if (state == NULL) {
+ return NULL;
+ }
+
+ group* gr = android_id_to_group(&state->group_, gid);
+ if (gr != NULL) {
+ return gr;
+ }
+
+ return app_id_to_group(gid, state);
+}
+
+group* getgrnam(const char* name) { // NOLINT: implementing bad function.
+ stubs_state_t* state = __stubs_state();
+ if (state == NULL) {
+ return NULL;
+ }
+
+ if (android_name_to_group(&state->group_, name) != 0) {
+ return &state->group_;
+ }
+
+ return app_id_to_group(app_id_from_name(name), state);
+}
+
+static void unimplemented_stub(const char* function) {
+ const char* fmt = "%s(3) is not implemented on Android\n";
+ __libc_android_log_print(ANDROID_LOG_WARN, "libc", fmt, function);
+ fprintf(stderr, fmt, function);
+}
+
+#define UNIMPLEMENTED unimplemented_stub(__PRETTY_FUNCTION__)
+
+netent* getnetbyname(const char* name) {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+void endpwent() {
+ UNIMPLEMENTED;
+}
+
+mntent* getmntent(FILE* f) {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+char* ttyname(int fd) { // NOLINT: implementing bad function.
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+int ttyname_r(int fd, char* buf, size_t buflen) {
+ UNIMPLEMENTED;
+ return -ERANGE;
+}
+
+netent* getnetbyaddr(uint32_t net, int type) {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+protoent* getprotobyname(const char* name) {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+protoent* getprotobynumber(int proto) {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+char* getusershell() {
+ UNIMPLEMENTED;
+ return NULL;
+}
+
+void setusershell() {
+ UNIMPLEMENTED;
+}
+
+void endusershell() {
+ UNIMPLEMENTED;
+}
