ndc.c revision 44ec9035d3821f17d185032ed64446cabae266bf 
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 <unistd.h>
20#include <string.h>
21#include <signal.h>
22#include <errno.h>
23#include <fcntl.h>
24
25#include <sys/socket.h>
26#include <sys/select.h>
27#include <sys/time.h>
28#include <sys/types.h>
29#include <sys/un.h>
30
31#include <cutils/sockets.h>
32#include <private/android_filesystem_config.h>
33
34static void usage(char *progname);
35static int do_monitor(int sock, int stop_after_cmd);
36static int do_cmd(int sock, int argc, char **argv);
37
38int main(int argc, char **argv) {
39    int sock;
40
41    if (argc < 2)
42        usage(argv[0]);
43
44    if ((sock = socket_local_client("netd",
45                                     ANDROID_SOCKET_NAMESPACE_RESERVED,
46                                     SOCK_STREAM)) < 0) {
47        fprintf(stderr, "Error connecting (%s)\n", strerror(errno));
48        exit(4);
49    }
50
51    if (!strcmp(argv[1], "monitor"))
52        exit(do_monitor(sock, 0));
53    exit(do_cmd(sock, argc, argv));
54}
55
56static int do_cmd(int sock, int argc, char **argv) {
57    char final_cmd[255] = { '0', ' ', '\0' };
58    int i;
59
60    for (i = 1; i < argc; i++) {
61        char *cmp;
62
63        if (!index(argv[i], ' '))
64            asprintf(&cmp, "%s%s", argv[i], (i == (argc -1)) ? "" : " ");
65        else
66            asprintf(&cmp, "\"%s\"%s", argv[i], (i == (argc -1)) ? "" : " ");
67
68        strcat(final_cmd, cmp);
69        free(cmp);
70    }
71
72    if (write(sock, final_cmd, strlen(final_cmd) + 1) < 0) {
73        perror("write");
74        return errno;
75    }
76
77    return do_monitor(sock, 1);
78}
79
80static int do_monitor(int sock, int stop_after_cmd) {
81    char *buffer = malloc(4096);
82
83    if (!stop_after_cmd)
84        printf("[Connected to Netd]\n");
85
86    while(1) {
87        fd_set read_fds;
88        struct timeval to;
89        int rc = 0;
90
91        to.tv_sec = 10;
92        to.tv_usec = 0;
93
94        FD_ZERO(&read_fds);
95        FD_SET(sock, &read_fds);
96
97        if ((rc = select(sock +1, &read_fds, NULL, NULL, &to)) < 0) {
98            fprintf(stderr, "Error in select (%s)\n", strerror(errno));
99            free(buffer);
100            return errno;
101        } else if (!rc) {
102            continue;
103            fprintf(stderr, "[TIMEOUT]\n");
104            return ETIMEDOUT;
105        } else if (FD_ISSET(sock, &read_fds)) {
106            memset(buffer, 0, 4096);
107            if ((rc = read(sock, buffer, 4096)) <= 0) {
108                if (rc == 0)
109                    fprintf(stderr, "Lost connection to Netd - did it crash?\n");
110                else
111                    fprintf(stderr, "Error reading data (%s)\n", strerror(errno));
112                free(buffer);
113                if (rc == 0)
114                    return ECONNRESET;
115                return errno;
116            }
117
118            int offset = 0;
119            int i = 0;
120
121            for (i = 0; i < rc; i++) {
122                if (buffer[i] == '\0') {
123                    int code;
124                    char tmp[4];
125
126                    strncpy(tmp, buffer + offset, 3);
127                    tmp[3] = '\0';
128                    code = atoi(tmp);
129
130                    printf("%s\n", buffer + offset);
131                    if (stop_after_cmd) {
132                        if (code >= 200 && code < 600)
133                            return 0;
134                    }
135                    offset = i + 1;
136                }
137            }
138        }
139    }
140    free(buffer);
141    return 0;
142}
143
144static void usage(char *progname) {
145    fprintf(stderr, "Usage: %s <monitor>|<cmd> [arg1] [arg2...]\n", progname);
146    exit(1);
147}
148
149