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am b66bc514: Merge "Clean up warnings in stubs.cpp."

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* commit 'b66bc51423a1f3969d0e70e035126ac4c4898b50':
  Clean up warnings in stubs.cpp.
This commit is contained in:
Elliott Hughes 2012-08-13 16:22:43 -07:00 committed by Android Git Automerger
commit aa6c8994b7
3 changed files with 462 additions and 526 deletions
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2
libc/Android.mk
View file

@ -292,7 +292,7 @@ libc_common_src_files := \
bionic/sched_cpucount.c \ bionic/sched_cpucount.c \
bionic/semaphore.c \ bionic/semaphore.c \
bionic/sha1.c \ bionic/sha1.c \
bionic/stubs.c \ bionic/stubs.cpp \
bionic/system_properties.c \ bionic/system_properties.c \
bionic/tdelete.c \ bionic/tdelete.c \
bionic/tdestroy.c \ bionic/tdestroy.c \

525
libc/bionic/stubs.c
View file

@ -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;
}

461
libc/bionic/stubs.cpp Normal file
View file

@ -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;
}