158 lines
3.9 KiB
C++
158 lines
3.9 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <poll.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <android-base/stringprintf.h>
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#include <selinux/selinux.h>
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#include "ueventd.h"
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#include "log.h"
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#include "util.h"
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#include "devices.h"
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#include "ueventd_parser.h"
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#include "property_service.h"
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int ueventd_main(int argc, char **argv)
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{
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/*
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* init sets the umask to 077 for forked processes. We need to
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* create files with exact permissions, without modification by
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* the umask.
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*/
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umask(000);
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/* Prevent fire-and-forget children from becoming zombies.
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* If we should need to wait() for some children in the future
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* (as opposed to none right now), double-forking here instead
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* of ignoring SIGCHLD may be the better solution.
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*/
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signal(SIGCHLD, SIG_IGN);
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InitKernelLogging(argv);
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LOG(INFO) << "ueventd started!";
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selinux_callback cb;
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cb.func_log = selinux_klog_callback;
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selinux_set_callback(SELINUX_CB_LOG, cb);
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std::string hardware = property_get("ro.hardware");
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ueventd_parse_config_file("/ueventd.rc");
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ueventd_parse_config_file(android::base::StringPrintf("/ueventd.%s.rc", hardware.c_str()).c_str());
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device_init();
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pollfd ufd;
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ufd.events = POLLIN;
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ufd.fd = get_device_fd();
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while (true) {
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ufd.revents = 0;
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int nr = poll(&ufd, 1, -1);
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if (nr <= 0) {
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continue;
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}
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if (ufd.revents & POLLIN) {
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handle_device_fd();
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}
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}
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return 0;
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}
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void set_device_permission(int nargs, char **args)
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{
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char *name;
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char *attr = 0;
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mode_t perm;
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uid_t uid;
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gid_t gid;
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int prefix = 0;
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int wildcard = 0;
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char *endptr;
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if (nargs == 0)
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return;
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if (args[0][0] == '#')
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return;
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name = args[0];
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if (!strncmp(name,"/sys/", 5) && (nargs == 5)) {
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LOG(INFO) << "/sys/ rule " << args[0] << " " << args[1];
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attr = args[1];
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args++;
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nargs--;
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}
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if (nargs != 4) {
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LOG(ERROR) << "invalid line ueventd.rc line for '" << args[0] << "'";
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return;
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}
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int len = strlen(name);
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char *wildcard_chr = strchr(name, '*');
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if ((name[len - 1] == '*') && (wildcard_chr == (name + len - 1))) {
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prefix = 1;
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name[len - 1] = '\0';
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} else if (wildcard_chr) {
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wildcard = 1;
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}
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perm = strtol(args[1], &endptr, 8);
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if (!endptr || *endptr != '\0') {
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LOG(ERROR) << "invalid mode '" << args[1] << "'";
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return;
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}
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struct passwd* pwd = getpwnam(args[2]);
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if (!pwd) {
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LOG(ERROR) << "invalid uid '" << args[2] << "'";
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return;
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}
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uid = pwd->pw_uid;
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struct group* grp = getgrnam(args[3]);
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if (!grp) {
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LOG(ERROR) << "invalid gid '" << args[3] << "'";
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return;
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}
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gid = grp->gr_gid;
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if (add_dev_perms(name, attr, perm, uid, gid, prefix, wildcard) != 0) {
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PLOG(ERROR) << "add_dev_perms(name=" << name <<
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", attr=" << attr <<
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", perm=" << std::oct << perm << std::dec <<
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", uid=" << uid << ", gid=" << gid <<
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", prefix=" << prefix << ", wildcard=" << wildcard <<
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")";
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return;
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}
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}
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