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 31 static char hardware[32]; 32 static unsigned revision = 0; 33 34 int 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 67 static 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 76 void set_device_permission(int nargs, char **args) 77 { 78 char *name; 79 char *attr = 0; 80 mode_t perm; 81 uid_t uid; 82 gid_t gid; 83 int prefix = 0; 84 char *endptr; 85 int ret; 86 char *tmp = 0; 87 88 if (nargs == 0) 89 return; 90 91 if (args[0][0] == '#') 92 return; 93 94 name = args[0]; 95 96 if (!strncmp(name,"/sys/", 5) && (nargs == 5)) { 97 INFO("/sys/ rule %s %s\n",args[0],args[1]); 98 attr = args[1]; 99 args++; 100 nargs--; 101 } 102 103 if (nargs != 4) { 104 ERROR("invalid line ueventd.rc line for '%s'\n", args[0]); 105 return; 106 } 107 108 /* If path starts with mtd@ lookup the mount number. */ 109 if (!strncmp(name, "mtd@", 4)) { 110 int n = mtd_name_to_number(name + 4); 111 if (n >= 0) 112 asprintf(&tmp, "/dev/mtd/mtd%d", n); 113 name = tmp; 114 } else { 115 int len = strlen(name); 116 if (name[len - 1] == '*') { 117 prefix = 1; 118 name[len - 1] = '\0'; 119 } 120 } 121 122 perm = strtol(args[1], &endptr, 8); 123 if (!endptr || *endptr != '\0') { 124 ERROR("invalid mode '%s'\n", args[1]); 125 free(tmp); 126 return; 127 } 128 129 ret = get_android_id(args[2]); 130 if (ret < 0) { 131 ERROR("invalid uid '%s'\n", args[2]); 132 free(tmp); 133 return; 134 } 135 uid = ret; 136 137 ret = get_android_id(args[3]); 138 if (ret < 0) { 139 ERROR("invalid gid '%s'\n", args[3]); 140 free(tmp); 141 return; 142 } 143 gid = ret; 144 145 add_dev_perms(name, attr, perm, uid, gid, prefix); 146 free(tmp); 147 } 148