ndc.c revision ad5b41fae92f20fa9fff334c459dd400de0b8285 
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    int cmdOffset = 0;
41
42    if (argc < 2)
43        usage(argv[0]);
44
45    // try interpreting the first arg as the socket name - if it fails go back to netd
46
47    if ((sock = socket_local_client(argv[1],
48                                     ANDROID_SOCKET_NAMESPACE_RESERVED,
49                                     SOCK_STREAM)) < 0) {
50        if ((sock = socket_local_client("netd",
51                                         ANDROID_SOCKET_NAMESPACE_RESERVED,
52                                         SOCK_STREAM)) < 0) {
53            fprintf(stderr, "Error connecting (%s)\n", strerror(errno));
54            exit(4);
55        }
56    } else {
57        if (argc < 3) usage(argv[0]);
58        printf("Using alt socket %s\n", argv[1]);
59        cmdOffset = 1;
60    }
61
62    if (!strcmp(argv[1+cmdOffset], "monitor"))
63        exit(do_monitor(sock, 0));
64    exit(do_cmd(sock, argc-cmdOffset, &(argv[cmdOffset])));
65}
66
67static int do_cmd(int sock, int argc, char **argv) {
68    char *final_cmd = strdup("0 ");
69    if (final_cmd == NULL) {
70        perror("strdup");
71        return errno;
72    }
73
74    int i;
75
76    for (i = 1; i < argc; i++) {
77        if (index(argv[i], '"')) {
78            perror("argument with embedded quotes not allowed");
79            free(final_cmd);
80            return 1;
81        }
82        bool needs_quoting = index(argv[i], ' ');
83        const char *format = needs_quoting ? "%s\"%s\"%s" : "%s%s%s";
84        char *cmp;
85
86        if (asprintf(&cmp, format, final_cmd, argv[i],
87                     (i == (argc -1)) ? "" : " ") < 0) {
88            perror("malloc");
89            free(final_cmd);
90            return errno;
91        }
92        free(final_cmd);
93        final_cmd = cmp;
94    }
95
96    if (write(sock, final_cmd, strlen(final_cmd) + 1) < 0) {
97        perror("write");
98        free(final_cmd);
99        return errno;
100    }
101    free(final_cmd);
102
103    return do_monitor(sock, 1);
104}
105
106static int do_monitor(int sock, int stop_after_cmd) {
107    char *buffer = malloc(4096);
108
109    if (!stop_after_cmd)
110        printf("[Connected to Netd]\n");
111
112    while(1) {
113        fd_set read_fds;
114        struct timeval to;
115        int rc = 0;
116
117        to.tv_sec = 10;
118        to.tv_usec = 0;
119
120        FD_ZERO(&read_fds);
121        FD_SET(sock, &read_fds);
122
123        if ((rc = select(sock +1, &read_fds, NULL, NULL, &to)) < 0) {
124            fprintf(stderr, "Error in select (%s)\n", strerror(errno));
125            free(buffer);
126            return errno;
127        } else if (!rc) {
128            continue;
129            fprintf(stderr, "[TIMEOUT]\n");
130            return ETIMEDOUT;
131        } else if (FD_ISSET(sock, &read_fds)) {
132            memset(buffer, 0, 4096);
133            if ((rc = read(sock, buffer, 4096)) <= 0) {
134                if (rc == 0)
135                    fprintf(stderr, "Lost connection to Netd - did it crash?\n");
136                else
137                    fprintf(stderr, "Error reading data (%s)\n", strerror(errno));
138                free(buffer);
139                if (rc == 0)
140                    return ECONNRESET;
141                return errno;
142            }
143
144            int offset = 0;
145            int i = 0;
146
147            for (i = 0; i < rc; i++) {
148                if (buffer[i] == '\0') {
149                    int code;
150                    char tmp[4];
151
152                    strncpy(tmp, buffer + offset, 3);
153                    tmp[3] = '\0';
154                    code = atoi(tmp);
155
156                    printf("%s\n", buffer + offset);
157                    if (stop_after_cmd) {
158                        if (code >= 200 && code < 600)
159                            return 0;
160                    }
161                    offset = i + 1;
162                }
163            }
164        }
165    }
166    free(buffer);
167    return 0;
168}
169
170static void usage(char *progname) {
171    fprintf(stderr, "Usage: %s [sockname] <monitor>|<cmd> [arg1] [arg2...]\n", progname);
172    exit(1);
173}
174