main.cpp revision d2617936acc15567fc5111bbdb4dde20845c3cba 
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#include "MDnsSdListener.h"
37#include "UidMarkMap.h"
38
39static void coldboot(const char *path);
40static void sigchld_handler(int sig);
41static void blockSigpipe();
42
43int main() {
44
45    CommandListener *cl;
46    NetlinkManager *nm;
47    DnsProxyListener *dpl;
48    MDnsSdListener *mdnsl;
49
50    ALOGI("Netd 1.0 starting");
51
52//    signal(SIGCHLD, sigchld_handler);
53    blockSigpipe();
54
55    if (!(nm = NetlinkManager::Instance())) {
56        ALOGE("Unable to create NetlinkManager");
57        exit(1);
58    };
59
60    UidMarkMap *rangeMap = new UidMarkMap();
61
62    cl = new CommandListener(rangeMap);
63    nm->setBroadcaster((SocketListener *) cl);
64
65    if (nm->start()) {
66        ALOGE("Unable to start NetlinkManager (%s)", strerror(errno));
67        exit(1);
68    }
69
70    // Set local DNS mode, to prevent bionic from proxying
71    // back to this service, recursively.
72    setenv("ANDROID_DNS_MODE", "local", 1);
73    dpl = new DnsProxyListener(rangeMap);
74    if (dpl->startListener()) {
75        ALOGE("Unable to start DnsProxyListener (%s)", strerror(errno));
76        exit(1);
77    }
78
79    mdnsl = new MDnsSdListener();
80    if (mdnsl->startListener()) {
81        ALOGE("Unable to start MDnsSdListener (%s)", strerror(errno));
82        exit(1);
83    }
84    /*
85     * Now that we're up, we can respond to commands
86     */
87    if (cl->startListener()) {
88        ALOGE("Unable to start CommandListener (%s)", strerror(errno));
89        exit(1);
90    }
91
92    // Eventually we'll become the monitoring thread
93    while(1) {
94        sleep(1000);
95    }
96
97    ALOGI("Netd exiting");
98    exit(0);
99}
100
101static void do_coldboot(DIR *d, int lvl)
102{
103    struct dirent *de;
104    int dfd, fd;
105
106    dfd = dirfd(d);
107
108    fd = openat(dfd, "uevent", O_WRONLY);
109    if(fd >= 0) {
110        write(fd, "add\n", 4);
111        close(fd);
112    }
113
114    while((de = readdir(d))) {
115        DIR *d2;
116
117        if (de->d_name[0] == '.')
118            continue;
119
120        if (de->d_type != DT_DIR && lvl > 0)
121            continue;
122
123        fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
124        if(fd < 0)
125            continue;
126
127        d2 = fdopendir(fd);
128        if(d2 == 0)
129            close(fd);
130        else {
131            do_coldboot(d2, lvl + 1);
132            closedir(d2);
133        }
134    }
135}
136
137static void coldboot(const char *path)
138{
139    DIR *d = opendir(path);
140    if(d) {
141        do_coldboot(d, 0);
142        closedir(d);
143    }
144}
145
146static void sigchld_handler(int sig) {
147    pid_t pid = wait(NULL);
148    ALOGD("Child process %d exited", pid);
149}
150
151static void blockSigpipe()
152{
153    sigset_t mask;
154
155    sigemptyset(&mask);
156    sigaddset(&mask, SIGPIPE);
157    if (sigprocmask(SIG_BLOCK, &mask, NULL) != 0)
158        ALOGW("WARNING: SIGPIPE not blocked\n");
159}
160