1 /*
2 * Copyright (C) 2008 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 <stdio.h>
18 #include <stdlib.h>
19 #include <signal.h>
20 #include <errno.h>
21 #include <string.h>
22 #include <sys/stat.h>
23 #include <sys/types.h>
24 #include <sys/wait.h>
25
26 #include <fcntl.h>
27 #include <dirent.h>
28
29 #define LOG_TAG "Netd"
30
31 #include "cutils/log.h"
32 #include "utils/RWLock.h"
33
34 #include <binder/IPCThreadState.h>
35 #include <binder/IServiceManager.h>
36 #include <binder/ProcessState.h>
37
38 #include "Controllers.h"
39 #include "CommandListener.h"
40 #include "NetdConstants.h"
41 #include "NetdNativeService.h"
42 #include "NetlinkManager.h"
43 #include "DnsProxyListener.h"
44 #include "MDnsSdListener.h"
45 #include "FwmarkServer.h"
46
47 using android::status_t;
48 using android::sp;
49 using android::IPCThreadState;
50 using android::ProcessState;
51 using android::defaultServiceManager;
52 using android::net::NetdNativeService;
53
54 static void blockSigpipe();
55 static void remove_pid_file();
56 static bool write_pid_file();
57
58 const char* const PID_FILE_PATH = "/data/misc/net/netd_pid";
59 const int PID_FILE_FLAGS = O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW | O_CLOEXEC;
60 const mode_t PID_FILE_MODE = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; // mode 0644, rw-r--r--
61
62 android::RWLock android::net::gBigNetdLock;
63
main()64 int main() {
65 using android::net::gCtls;
66
67 ALOGI("Netd 1.0 starting");
68 remove_pid_file();
69
70 blockSigpipe();
71
72 NetlinkManager *nm = NetlinkManager::Instance();
73 if (nm == nullptr) {
74 ALOGE("Unable to create NetlinkManager");
75 exit(1);
76 };
77
78 gCtls = new android::net::Controllers();
79 CommandListener cl;
80 nm->setBroadcaster((SocketListener *) &cl);
81
82 if (nm->start()) {
83 ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
84 exit(1);
85 }
86
87 // Set local DNS mode, to prevent bionic from proxying
88 // back to this service, recursively.
89 setenv("ANDROID_DNS_MODE", "local", 1);
90 DnsProxyListener dpl(&gCtls->netCtrl);
91 if (dpl.startListener()) {
92 ALOGE("Unable to start DnsProxyListener (%s)", strerror(errno));
93 exit(1);
94 }
95
96 MDnsSdListener mdnsl;
97 if (mdnsl.startListener()) {
98 ALOGE("Unable to start MDnsSdListener (%s)", strerror(errno));
99 exit(1);
100 }
101
102 FwmarkServer fwmarkServer(&gCtls->netCtrl);
103 if (fwmarkServer.startListener()) {
104 ALOGE("Unable to start FwmarkServer (%s)", strerror(errno));
105 exit(1);
106 }
107
108 status_t ret;
109 if ((ret = NetdNativeService::start()) != android::OK) {
110 ALOGE("Unable to start NetdNativeService: %d", ret);
111 exit(1);
112 }
113
114 /*
115 * Now that we're up, we can respond to commands. Starting the listener also tells
116 * NetworkManagementService that we are up and that our binder interface is ready.
117 */
118 if (cl.startListener()) {
119 ALOGE("Unable to start CommandListener (%s)", strerror(errno));
120 exit(1);
121 }
122
123 write_pid_file();
124
125 IPCThreadState::self()->joinThreadPool();
126
127 ALOGI("Netd exiting");
128
129 remove_pid_file();
130
131 exit(0);
132 }
133
write_pid_file()134 static bool write_pid_file() {
135 char pid_buf[INT32_STRLEN];
136 snprintf(pid_buf, sizeof(pid_buf), "%d\n", (int) getpid());
137
138 int fd = open(PID_FILE_PATH, PID_FILE_FLAGS, PID_FILE_MODE);
139 if (fd == -1) {
140 ALOGE("Unable to create pid file (%s)", strerror(errno));
141 return false;
142 }
143
144 // File creation is affected by umask, so make sure the right mode bits are set.
145 if (fchmod(fd, PID_FILE_MODE) == -1) {
146 ALOGE("failed to set mode 0%o on %s (%s)", PID_FILE_MODE, PID_FILE_PATH, strerror(errno));
147 close(fd);
148 remove_pid_file();
149 return false;
150 }
151
152 if (write(fd, pid_buf, strlen(pid_buf)) != (ssize_t)strlen(pid_buf)) {
153 ALOGE("Unable to write to pid file (%s)", strerror(errno));
154 close(fd);
155 remove_pid_file();
156 return false;
157 }
158 close(fd);
159 return true;
160 }
161
remove_pid_file()162 static void remove_pid_file() {
163 unlink(PID_FILE_PATH);
164 }
165
blockSigpipe()166 static void blockSigpipe()
167 {
168 sigset_t mask;
169
170 sigemptyset(&mask);
171 sigaddset(&mask, SIGPIPE);
172 if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
173 ALOGW("WARNING: SIGPIPE not blocked\n");
174 }
175