ueventd.c revision 8f91282ebe1963b9d27f8779ad1342302b293bd2
1f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross/* 2f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * Copyright (C) 2010 The Android Open Source Project 3f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * 4f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * Licensed under the Apache License, Version 2.0 (the "License"); 5f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * you may not use this file except in compliance with the License. 6f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * You may obtain a copy of the License at 7f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * 8f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * http://www.apache.org/licenses/LICENSE-2.0 9f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * 10f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * Unless required by applicable law or agreed to in writing, software 11f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * distributed under the License is distributed on an "AS IS" BASIS, 12f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * See the License for the specific language governing permissions and 14f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross * limitations under the License. 15f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross */ 16f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 17f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross#include <poll.h> 1844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <fcntl.h> 1944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <string.h> 2044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <stdlib.h> 2144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <stdio.h> 2244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <ctype.h> 238d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland#include <signal.h> 248d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland 2544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include <private/android_filesystem_config.h> 26f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 27f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross#include "ueventd.h" 28f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross#include "log.h" 29f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross#include "util.h" 30f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross#include "devices.h" 3144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross#include "ueventd_parser.h" 3244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 3344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Crossstatic char hardware[32]; 3444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Crossstatic unsigned revision = 0; 35f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 36f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Crossint ueventd_main(int argc, char **argv) 37f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross{ 38f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross struct pollfd ufd; 39f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross int nr; 4044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross char tmp[32]; 41f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 428d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland /* Prevent fire-and-forget children from becoming zombies. 438d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland * If we should need to wait() for some children in the future 448d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland * (as opposed to none right now), double-forking here instead 458d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland * of ignoring SIGCHLD may be the better solution. 468d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland */ 478d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland signal(SIGCHLD, SIG_IGN); 488d48c8e45724c7103f0ace7885d339e49399908bBrian Swetland 49f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross open_devnull_stdio(); 508f91282ebe1963b9d27f8779ad1342302b293bd2Dima Zavin klog_init(); 51f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 52f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross INFO("starting ueventd\n"); 53f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 5444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross get_hardware_name(hardware, &revision); 5544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 5644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ueventd_parse_config_file("/ueventd.rc"); 5744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 5844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross snprintf(tmp, sizeof(tmp), "/ueventd.%s.rc", hardware); 5944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ueventd_parse_config_file(tmp); 6044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 61f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross device_init(); 62f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 63f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross ufd.events = POLLIN; 64f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross ufd.fd = get_device_fd(); 65f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross 66f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross while(1) { 67f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross ufd.revents = 0; 68f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross nr = poll(&ufd, 1, -1); 69f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross if (nr <= 0) 70f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross continue; 71f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross if (ufd.revents == POLLIN) 72f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross handle_device_fd(); 73f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross } 74f83d0b9af5cbe4440cc41ceaa8a7806a13c86282Colin Cross} 7544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 7644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Crossstatic int get_android_id(const char *id) 7744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross{ 7844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross unsigned int i; 7944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross for (i = 0; i < ARRAY_SIZE(android_ids); i++) 8044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (!strcmp(id, android_ids[i].name)) 8144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return android_ids[i].aid; 8244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return 0; 8344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross} 8444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 8544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Crossvoid set_device_permission(int nargs, char **args) 8644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross{ 8744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross char *name; 88bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland char *attr = 0; 8944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross mode_t perm; 9044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross uid_t uid; 9144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross gid_t gid; 9244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross int prefix = 0; 9344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross char *endptr; 9444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross int ret; 9544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross char *tmp = 0; 9644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 9744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (nargs == 0) 9844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 9944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 10044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (args[0][0] == '#') 10144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 10244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 103bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland name = args[0]; 104bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland 105bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland if (!strncmp(name,"/sys/", 5) && (nargs == 5)) { 106bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland INFO("/sys/ rule %s %s\n",args[0],args[1]); 107bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland attr = args[1]; 108bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland args++; 109bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland nargs--; 110bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland } 111bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland 11244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (nargs != 4) { 11344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ERROR("invalid line ueventd.rc line for '%s'\n", args[0]); 11444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 11544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 11644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 11744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross /* If path starts with mtd@ lookup the mount number. */ 11844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (!strncmp(name, "mtd@", 4)) { 11944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross int n = mtd_name_to_number(name + 4); 12044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (n >= 0) 12144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross asprintf(&tmp, "/dev/mtd/mtd%d", n); 12244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross name = tmp; 12344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } else { 12444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross int len = strlen(name); 12544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (name[len - 1] == '*') { 12644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross prefix = 1; 12744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross name[len - 1] = '\0'; 12844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 12944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 13044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 13144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross perm = strtol(args[1], &endptr, 8); 13244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (!endptr || *endptr != '\0') { 13344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ERROR("invalid mode '%s'\n", args[1]); 13444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross free(tmp); 13544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 13644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 13744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 13844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ret = get_android_id(args[2]); 13944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (ret < 0) { 14044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ERROR("invalid uid '%s'\n", args[2]); 14144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross free(tmp); 14244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 14344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 14444b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross uid = ret; 14544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 14644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ret = get_android_id(args[3]); 14744b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross if (ret < 0) { 14844b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross ERROR("invalid gid '%s'\n", args[3]); 14944b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross free(tmp); 15044b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross return; 15144b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross } 15244b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross gid = ret; 15344b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross 154bc57d4ce925a62f14c28c55e0ff28af1114f12beBrian Swetland add_dev_perms(name, attr, perm, uid, gid, prefix); 15544b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross free(tmp); 15644b65d047cc39baf30e21bfd8dd438f6bc1f77f5Colin Cross} 157