diff options
Diffstat (limited to 'init/property_service.c')
| -rw-r--r-- | init/property_service.c | 502 |
1 files changed, 0 insertions, 502 deletions
diff --git a/init/property_service.c b/init/property_service.c deleted file mode 100644 index 7a6416b5e..000000000 --- a/init/property_service.c +++ /dev/null @@ -1,502 +0,0 @@ -/* - * Copyright (C) 2007 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <unistd.h> -#include <string.h> -#include <ctype.h> -#include <fcntl.h> -#include <stdarg.h> -#include <dirent.h> -#include <limits.h> -#include <errno.h> - -#include <cutils/misc.h> -#include <cutils/sockets.h> -#include <cutils/ashmem.h> - -#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_ -#include <sys/_system_properties.h> - -#include <sys/socket.h> -#include <sys/un.h> -#include <sys/select.h> -#include <sys/types.h> -#include <netinet/in.h> -#include <sys/mman.h> -#include <sys/atomics.h> -#include <private/android_filesystem_config.h> - -#include "property_service.h" -#include "init.h" - -#define PERSISTENT_PROPERTY_DIR "/data/property" - -static int persistent_properties_loaded = 0; - -/* White list of permissions for setting property services. */ -struct { - const char *prefix; - unsigned int uid; -} property_perms[] = { - { "net.rmnet0.", AID_RADIO }, - { "net.gprs.", AID_RADIO }, - { "ril.", AID_RADIO }, - { "gsm.", AID_RADIO }, - { "net.dns", AID_RADIO }, - { "net.", AID_SYSTEM }, - { "dev.", AID_SYSTEM }, - { "runtime.", AID_SYSTEM }, - { "hw.", AID_SYSTEM }, - { "sys.", AID_SYSTEM }, - { "service.", AID_SYSTEM }, - { "wlan.", AID_SYSTEM }, - { "dhcp.", AID_SYSTEM }, - { "dhcp.", AID_DHCP }, - { "debug.", AID_SHELL }, - { "log.", AID_SHELL }, - { "persist.sys.", AID_SYSTEM }, - { "persist.service.", AID_SYSTEM }, - { NULL, 0 } -}; - -/* - * White list of UID that are allowed to start/stop services. - * Currently there are no user apps that require. - */ -struct { - const char *service; - unsigned int uid; -} control_perms[] = { - {NULL, 0 } -}; - -typedef struct { - void *data; - size_t size; - int fd; -} workspace; - -static int init_workspace(workspace *w, size_t size) -{ - void *data; - int fd; - - fd = ashmem_create_region("system_properties", size); - if(fd < 0) - return -1; - - data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); - if(data == MAP_FAILED) - goto out; - - /* allow the wolves we share with to do nothing but read */ - ashmem_set_prot_region(fd, PROT_READ); - - w->data = data; - w->size = size; - w->fd = fd; - - return 0; - -out: - close(fd); - return -1; -} - -/* (8 header words + 247 toc words) = 1020 bytes */ -/* 1024 bytes header and toc + 247 prop_infos @ 128 bytes = 32640 bytes */ - -#define PA_COUNT_MAX 247 -#define PA_INFO_START 1024 -#define PA_SIZE 32768 - -static workspace pa_workspace; -static prop_info *pa_info_array; - -extern prop_area *__system_property_area__; - -static int init_property_area(void) -{ - prop_area *pa; - - if(pa_info_array) - return -1; - - if(init_workspace(&pa_workspace, PA_SIZE)) - return -1; - - fcntl(pa_workspace.fd, F_SETFD, FD_CLOEXEC); - - pa_info_array = (void*) (((char*) pa_workspace.data) + PA_INFO_START); - - pa = pa_workspace.data; - memset(pa, 0, PA_SIZE); - pa->magic = PROP_AREA_MAGIC; - pa->version = PROP_AREA_VERSION; - - /* plug into the lib property services */ - __system_property_area__ = pa; - - return 0; -} - -static void update_prop_info(prop_info *pi, const char *value, unsigned len) -{ - pi->serial = pi->serial | 1; - memcpy(pi->value, value, len + 1); - pi->serial = (len << 24) | ((pi->serial + 1) & 0xffffff); - __futex_wake(&pi->serial, INT32_MAX); -} - -static int property_write(prop_info *pi, const char *value) -{ - int valuelen = strlen(value); - if(valuelen >= PROP_VALUE_MAX) return -1; - update_prop_info(pi, value, valuelen); - return 0; -} - - -/* - * Checks permissions for starting/stoping system services. - * AID_SYSTEM and AID_ROOT are always allowed. - * - * Returns 1 if uid allowed, 0 otherwise. - */ -static int check_control_perms(const char *name, int uid) { - int i; - if (uid == AID_SYSTEM || uid == AID_ROOT) - return 1; - - /* Search the ACL */ - for (i = 0; control_perms[i].service; i++) { - if (strcmp(control_perms[i].service, name) == 0) { - if (control_perms[i].uid == uid) - return 1; - } - } - return 0; -} - -/* - * Checks permissions for setting system properties. - * Returns 1 if uid allowed, 0 otherwise. - */ -static int check_perms(const char *name, unsigned int uid) -{ - int i; - if (uid == 0) - return 1; - - if(!strncmp(name, "ro.", 3)) - name +=3; - - for (i = 0; property_perms[i].prefix; i++) { - int tmp; - if (strncmp(property_perms[i].prefix, name, - strlen(property_perms[i].prefix)) == 0) { - if (property_perms[i].uid == uid) { - return 1; - } - } - } - - return 0; -} - -const char* property_get(const char *name) -{ - prop_info *pi; - - if(strlen(name) >= PROP_NAME_MAX) return 0; - - pi = (prop_info*) __system_property_find(name); - - if(pi != 0) { - return pi->value; - } else { - return 0; - } -} - -static void write_peristent_property(const char *name, const char *value) -{ - const char *tempPath = PERSISTENT_PROPERTY_DIR "/.temp"; - char path[PATH_MAX]; - int fd, length; - - snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, name); - - fd = open(tempPath, O_WRONLY|O_CREAT|O_TRUNC, 0600); - if (fd < 0) { - ERROR("Unable to write persistent property to temp file %s errno: %d\n", tempPath, errno); - return; - } - write(fd, value, strlen(value)); - close(fd); - - if (rename(tempPath, path)) { - unlink(tempPath); - ERROR("Unable to rename persistent property file %s to %s\n", tempPath, path); - } -} - -int property_set(const char *name, const char *value) -{ - prop_area *pa; - prop_info *pi; - - int namelen = strlen(name); - int valuelen = strlen(value); - - if(namelen >= PROP_NAME_MAX) return -1; - if(valuelen >= PROP_VALUE_MAX) return -1; - if(namelen < 1) return -1; - - pi = (prop_info*) __system_property_find(name); - - if(pi != 0) { - /* ro.* properties may NEVER be modified once set */ - if(!strncmp(name, "ro.", 3)) return -1; - - pa = __system_property_area__; - update_prop_info(pi, value, valuelen); - pa->serial++; - __futex_wake(&pa->serial, INT32_MAX); - } else { - pa = __system_property_area__; - if(pa->count == PA_COUNT_MAX) return -1; - - pi = pa_info_array + pa->count; - pi->serial = (valuelen << 24); - memcpy(pi->name, name, namelen + 1); - memcpy(pi->value, value, valuelen + 1); - - pa->toc[pa->count] = - (namelen << 24) | (((unsigned) pi) - ((unsigned) pa)); - - pa->count++; - pa->serial++; - __futex_wake(&pa->serial, INT32_MAX); - } - /* If name starts with "net." treat as a DNS property. */ - if (strncmp("net.", name, sizeof("net.") - 1) == 0) { - if (strcmp("net.change", name) == 0) { - return 0; - } - /* - * The 'net.change' property is a special property used track when any - * 'net.*' property name is updated. It is _ONLY_ updated here. Its value - * contains the last updated 'net.*' property. - */ - property_set("net.change", name); - } else if (persistent_properties_loaded && - strncmp("persist.", name, sizeof("persist.") - 1) == 0) { - /* - * Don't write properties to disk until after we have read all default properties - * to prevent them from being overwritten by default values. - */ - write_peristent_property(name, value); - } - property_changed(name, value); - return 0; -} - -static int property_list(void (*propfn)(const char *key, const char *value, void *cookie), - void *cookie) -{ - char name[PROP_NAME_MAX]; - char value[PROP_VALUE_MAX]; - const prop_info *pi; - unsigned n; - - for(n = 0; (pi = __system_property_find_nth(n)); n++) { - __system_property_read(pi, name, value); - propfn(name, value, cookie); - } - return 0; -} - -void handle_property_set_fd(int fd) -{ - prop_msg msg; - int s; - int r; - int res; - struct ucred cr; - struct sockaddr_un addr; - socklen_t addr_size = sizeof(addr); - socklen_t cr_size = sizeof(cr); - - if ((s = accept(fd, (struct sockaddr *) &addr, &addr_size)) < 0) { - return; - } - - /* Check socket options here */ - if (getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cr, &cr_size) < 0) { - close(s); - ERROR("Unable to recieve socket options\n"); - return; - } - - r = recv(s, &msg, sizeof(msg), 0); - close(s); - if(r != sizeof(prop_msg)) { - ERROR("sys_prop: mis-match msg size recieved: %d expected: %d\n", - r, sizeof(prop_msg)); - return; - } - - switch(msg.cmd) { - case PROP_MSG_SETPROP: - msg.name[PROP_NAME_MAX-1] = 0; - msg.value[PROP_VALUE_MAX-1] = 0; - - if(memcmp(msg.name,"ctl.",4) == 0) { - if (check_control_perms(msg.value, cr.uid)) { - handle_control_message((char*) msg.name + 4, (char*) msg.value); - } else { - ERROR("sys_prop: Unable to %s service ctl [%s] uid: %d pid:%d\n", - msg.name + 4, msg.value, cr.uid, cr.pid); - } - } else { - if (check_perms(msg.name, cr.uid)) { - property_set((char*) msg.name, (char*) msg.value); - } else { - ERROR("sys_prop: permission denied uid:%d name:%s\n", - cr.uid, msg.name); - } - } - break; - - default: - break; - } -} - -void get_property_workspace(int *fd, int *sz) -{ - *fd = pa_workspace.fd; - *sz = pa_workspace.size; -} - -static void load_properties(char *data) -{ - char *key, *value, *eol, *sol, *tmp; - - sol = data; - while((eol = strchr(sol, '\n'))) { - key = sol; - *eol++ = 0; - sol = eol; - - value = strchr(key, '='); - if(value == 0) continue; - *value++ = 0; - - while(isspace(*key)) key++; - if(*key == '#') continue; - tmp = value - 2; - while((tmp > key) && isspace(*tmp)) *tmp-- = 0; - - while(isspace(*value)) value++; - tmp = eol - 2; - while((tmp > value) && isspace(*tmp)) *tmp-- = 0; - - property_set(key, value); - } -} - -static void load_properties_from_file(const char *fn) -{ - char *data; - unsigned sz; - - data = read_file(fn, &sz); - - if(data != 0) { - load_properties(data); - free(data); - } -} - -static void load_persistent_properties() -{ - DIR* dir = opendir(PERSISTENT_PROPERTY_DIR); - struct dirent* entry; - char path[PATH_MAX]; - char value[PROP_VALUE_MAX]; - int fd, length; - - if (dir) { - while ((entry = readdir(dir)) != NULL) { - if (!strcmp(entry->d_name, ".") || !strcmp(entry->d_name, "..") || - strncmp("persist.", entry->d_name, sizeof("persist.") - 1)) - continue; -#if HAVE_DIRENT_D_TYPE - if (entry->d_type != DT_REG) - continue; -#endif - /* open the file and read the property value */ - snprintf(path, sizeof(path), "%s/%s", PERSISTENT_PROPERTY_DIR, entry->d_name); - fd = open(path, O_RDONLY); - if (fd >= 0) { - length = read(fd, value, sizeof(value) - 1); - if (length >= 0) { - value[length] = 0; - property_set(entry->d_name, value); - } else { - ERROR("Unable to read persistent property file %s errno: %d\n", path, errno); - } - close(fd); - } else { - ERROR("Unable to open persistent property file %s errno: %d\n", path, errno); - } - } - closedir(dir); - } else { - ERROR("Unable to open persistent property directory %s errno: %d\n", PERSISTENT_PROPERTY_DIR, errno); - } - - persistent_properties_loaded = 1; -} - -void property_init(void) -{ - init_property_area(); - load_properties_from_file(PROP_PATH_RAMDISK_DEFAULT); -} - -int start_property_service(void) -{ - int fd; - - load_properties_from_file(PROP_PATH_SYSTEM_BUILD); - load_properties_from_file(PROP_PATH_SYSTEM_DEFAULT); - load_properties_from_file(PROP_PATH_LOCAL_OVERRIDE); - /* Read persistent properties after all default values have been loaded. */ - load_persistent_properties(); - - fd = create_socket(PROP_SERVICE_NAME, SOCK_STREAM, 0666, 0, 0); - if(fd < 0) return -1; - fcntl(fd, F_SETFD, FD_CLOEXEC); - fcntl(fd, F_SETFL, O_NONBLOCK); - - listen(fd, 8); - return fd; -} |