ueventd.c revision 44b65d047cc39baf30e21bfd8dd438f6bc1f77f5
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <poll.h> 18#include <fcntl.h> 19#include <string.h> 20#include <stdlib.h> 21#include <stdio.h> 22#include <ctype.h> 23#include <private/android_filesystem_config.h> 24 25#include "ueventd.h" 26#include "log.h" 27#include "util.h" 28#include "devices.h" 29#include "ueventd_parser.h" 30 31static char hardware[32]; 32static unsigned revision = 0; 33 34int ueventd_main(int argc, char **argv) 35{ 36 struct pollfd ufd; 37 int nr; 38 char tmp[32]; 39 40 open_devnull_stdio(); 41 log_init(); 42 43 INFO("starting ueventd\n"); 44 45 get_hardware_name(hardware, &revision); 46 47 ueventd_parse_config_file("/ueventd.rc"); 48 49 snprintf(tmp, sizeof(tmp), "/ueventd.%s.rc", hardware); 50 ueventd_parse_config_file(tmp); 51 52 device_init(); 53 54 ufd.events = POLLIN; 55 ufd.fd = get_device_fd(); 56 57 while(1) { 58 ufd.revents = 0; 59 nr = poll(&ufd, 1, -1); 60 if (nr <= 0) 61 continue; 62 if (ufd.revents == POLLIN) 63 handle_device_fd(); 64 } 65} 66 67static int get_android_id(const char *id) 68{ 69 unsigned int i; 70 for (i = 0; i < ARRAY_SIZE(android_ids); i++) 71 if (!strcmp(id, android_ids[i].name)) 72 return android_ids[i].aid; 73 return 0; 74} 75 76void set_device_permission(int nargs, char **args) 77{ 78 char *name; 79 mode_t perm; 80 uid_t uid; 81 gid_t gid; 82 int prefix = 0; 83 char *endptr; 84 int ret; 85 char *tmp = 0; 86 87 if (nargs == 0) 88 return; 89 90 if (args[0][0] == '#') 91 return; 92 93 if (nargs != 4) { 94 ERROR("invalid line ueventd.rc line for '%s'\n", args[0]); 95 return; 96 } 97 98 name = args[0]; 99 /* If path starts with mtd@ lookup the mount number. */ 100 if (!strncmp(name, "mtd@", 4)) { 101 int n = mtd_name_to_number(name + 4); 102 if (n >= 0) 103 asprintf(&tmp, "/dev/mtd/mtd%d", n); 104 name = tmp; 105 } else { 106 int len = strlen(name); 107 if (name[len - 1] == '*') { 108 prefix = 1; 109 name[len - 1] = '\0'; 110 } 111 } 112 113 perm = strtol(args[1], &endptr, 8); 114 if (!endptr || *endptr != '\0') { 115 ERROR("invalid mode '%s'\n", args[1]); 116 free(tmp); 117 return; 118 } 119 120 ret = get_android_id(args[2]); 121 if (ret < 0) { 122 ERROR("invalid uid '%s'\n", args[2]); 123 free(tmp); 124 return; 125 } 126 uid = ret; 127 128 ret = get_android_id(args[3]); 129 if (ret < 0) { 130 ERROR("invalid gid '%s'\n", args[3]); 131 free(tmp); 132 return; 133 } 134 gid = ret; 135 136 add_dev_perms(name, perm, uid, gid, prefix); 137 free(tmp); 138} 139