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