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- /*
- * 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 <grp.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <pwd.h>
- #include <netdb.h>
- #include <mntent.h>
- #include <private/android_filesystem_config.h>
- #include <pthread.h>
- #include <stdlib.h>
- #include <errno.h>
- #include <ctype.h>
- /** Thread-specific state for the stubs functions
- **/
- pthread_once_t the_once = PTHREAD_ONCE_INIT;
- 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 like app_1234 into the
- * corresponding user/group id (AID_APP + 1234)
- * returns 0 and sets errno to ENOENT in case of error
- */
- static unsigned
- app_id_from_name( const char* name )
- {
- unsigned long id;
- char* end;
- if (memcmp(name, "app_", 4) != 0 || !isdigit(name[4]))
- goto FAIL;
- id = strtoul(name+4, &end, 10);
- if (id == 0 || *end != '\0')
- goto FAIL;
- id += AID_APP;
- /* check for overflow and that the value can be
- * stored in our 32-bit uid_t/gid_t */
- if (id < AID_APP || (unsigned)id != id)
- goto FAIL;
- return (unsigned)id;
- FAIL:
- errno = ENOENT;
- return 0;
- }
- /* translate a uid into the corresponding app_<uid>
- * 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;
- }
- snprintf( state->app_name_buffer, sizeof state->app_name_buffer,
- "app_%u", uid - AID_APP );
- 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;
- if (gid < AID_APP) {
- errno = ENOENT;
- return NULL;
- }
- snprintf(state->group_name_buffer, sizeof state->group_name_buffer,
- "app_%u", gid - AID_APP);
- 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 );
- }
- struct netent* getnetbyname(const char *name)
- {
- fprintf(stderr, "FIX ME! implement getgrnam() %s:%d\n", __FILE__, __LINE__);
- return NULL;
- }
- void endpwent(void)
- {
- }
- struct mntent* getmntent(FILE* f)
- {
- fprintf(stderr, "FIX ME! implement getmntent() %s:%d\n", __FILE__, __LINE__);
- return NULL;
- }
- char* ttyname(int fd)
- {
- fprintf(stderr, "FIX ME! implement ttyname() %s:%d\n", __FILE__, __LINE__);
- return NULL;
- }
- struct netent *getnetbyaddr(uint32_t net, int type)
- {
- fprintf(stderr, "FIX ME! implement %s() %s:%d\n", __FUNCTION__, __FILE__, __LINE__);
- return NULL;
- }
- struct protoent *getprotobyname(const char *name)
- {
- fprintf(stderr, "FIX ME! implement %s() %s:%d\n", __FUNCTION__, __FILE__, __LINE__);
- return NULL;
- }
- struct protoent *getprotobynumber(int proto)
- {
- fprintf(stderr, "FIX ME! implement %s() %s:%d\n", __FUNCTION__, __FILE__, __LINE__);
- return NULL;
- }
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