main.cpp revision c1044d4507a79166f3cfac9cacf669888f049ea9 
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
33#include "CommandListener.h"
34#include "NetlinkManager.h"
35#include "DnsProxyListener.h"
36
37static void coldboot(const char *path);
38static void sigchld_handler(int sig);
39static void blockSigpipe();
40
41int main() {
42
43    CommandListener *cl;
44    NetlinkManager *nm;
45    DnsProxyListener *dpl;
46
47    ALOGI("Netd 1.0 starting");
48
49//    signal(SIGCHLD, sigchld_handler);
50    blockSigpipe();
51
52    if (!(nm = NetlinkManager::Instance())) {
53        ALOGE("Unable to create NetlinkManager");
54        exit(1);
55    };
56
57
58    cl = new CommandListener();
59    nm->setBroadcaster((SocketListener *) cl);
60
61    if (nm->start()) {
62        ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
63        exit(1);
64    }
65
66    // Set local DNS mode, to prevent bionic from proxying
67    // back to this service, recursively.
68    setenv("ANDROID_DNS_MODE", "local", 1);
69    dpl = new DnsProxyListener();
70    if (dpl->startListener()) {
71        ALOGE("Unable to start DnsProxyListener (%s)", strerror(errno));
72        exit(1);
73    }
74
75    /*
76     * Now that we're up, we can respond to commands
77     */
78    if (cl->startListener()) {
79        ALOGE("Unable to start CommandListener (%s)", strerror(errno));
80        exit(1);
81    }
82
83    // Eventually we'll become the monitoring thread
84    while(1) {
85        sleep(1000);
86    }
87
88    ALOGI("Netd exiting");
89    exit(0);
90}
91
92static void do_coldboot(DIR *d, int lvl)
93{
94    struct dirent *de;
95    int dfd, fd;
96
97    dfd = dirfd(d);
98
99    fd = openat(dfd, "uevent", O_WRONLY);
100    if(fd >= 0) {
101        write(fd, "add\n", 4);
102        close(fd);
103    }
104
105    while((de = readdir(d))) {
106        DIR *d2;
107
108        if (de->d_name[0] == '.')
109            continue;
110
111        if (de->d_type != DT_DIR && lvl > 0)
112            continue;
113
114        fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
115        if(fd < 0)
116            continue;
117
118        d2 = fdopendir(fd);
119        if(d2 == 0)
120            close(fd);
121        else {
122            do_coldboot(d2, lvl + 1);
123            closedir(d2);
124        }
125    }
126}
127
128static void coldboot(const char *path)
129{
130    DIR *d = opendir(path);
131    if(d) {
132        do_coldboot(d, 0);
133        closedir(d);
134    }
135}
136
137static void sigchld_handler(int sig) {
138    pid_t pid = wait(NULL);
139    ALOGD("Child process %d exited", pid);
140}
141
142static void blockSigpipe()
143{
144    sigset_t mask;
145
146    sigemptyset(&mask);
147    sigaddset(&mask, SIGPIPE);
148    if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
149        ALOGW("WARNING: SIGPIPE not blocked\n");
150}
151