ndc.c revision 745e09fc5694e73920aaad18a626275597bdddb1 
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[255] = { '0', ' ', '\0' };
69    int i;
70
71    for (i = 1; i < argc; i++) {
72        char *cmp;
73
74        if (!index(argv[i], ' '))
75            asprintf(&cmp, "%s%s", argv[i], (i == (argc -1)) ? "" : " ");
76        else
77            asprintf(&cmp, "\"%s\"%s", argv[i], (i == (argc -1)) ? "" : " ");
78
79        strcat(final_cmd, cmp);
80        free(cmp);
81    }
82
83    if (write(sock, final_cmd, strlen(final_cmd) + 1) < 0) {
84        perror("write");
85        return errno;
86    }
87
88    return do_monitor(sock, 1);
89}
90
91static int do_monitor(int sock, int stop_after_cmd) {
92    char *buffer = malloc(4096);
93
94    if (!stop_after_cmd)
95        printf("[Connected to Netd]\n");
96
97    while(1) {
98        fd_set read_fds;
99        struct timeval to;
100        int rc = 0;
101
102        to.tv_sec = 10;
103        to.tv_usec = 0;
104
105        FD_ZERO(&read_fds);
106        FD_SET(sock, &read_fds);
107
108        if ((rc = select(sock +1, &read_fds, NULL, NULL, &to)) < 0) {
109            fprintf(stderr, "Error in select (%s)\n", strerror(errno));
110            free(buffer);
111            return errno;
112        } else if (!rc) {
113            continue;
114            fprintf(stderr, "[TIMEOUT]\n");
115            return ETIMEDOUT;
116        } else if (FD_ISSET(sock, &read_fds)) {
117            memset(buffer, 0, 4096);
118            if ((rc = read(sock, buffer, 4096)) <= 0) {
119                if (rc == 0)
120                    fprintf(stderr, "Lost connection to Netd - did it crash?\n");
121                else
122                    fprintf(stderr, "Error reading data (%s)\n", strerror(errno));
123                free(buffer);
124                if (rc == 0)
125                    return ECONNRESET;
126                return errno;
127            }
128
129            int offset = 0;
130            int i = 0;
131
132            for (i = 0; i < rc; i++) {
133                if (buffer[i] == '\0') {
134                    int code;
135                    char tmp[4];
136
137                    strncpy(tmp, buffer + offset, 3);
138                    tmp[3] = '\0';
139                    code = atoi(tmp);
140
141                    printf("%s\n", buffer + offset);
142                    if (stop_after_cmd) {
143                        if (code >= 200 && code < 600)
144                            return 0;
145                    }
146                    offset = i + 1;
147                }
148            }
149        }
150    }
151    free(buffer);
152    return 0;
153}
154
155static void usage(char *progname) {
156    fprintf(stderr, "Usage: %s [sockname] <monitor>|<cmd> [arg1] [arg2...]\n", progname);
157    exit(1);
158}
159