route.c revision e898faddb3d5074a4489ce255927c6735b6f8b0d 
1/*
2 * Copyright (c) 2009, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *  * Neither the name of Google, Inc. nor the names of its contributors
15 *    may be used to endorse or promote products derived from this
16 *    software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <stdio.h>
33#include <string.h>
34#include <errno.h>
35#include <sys/ioctl.h>
36#include <sys/types.h>
37#include <sys/socket.h>
38#include <netinet/in.h>
39#include <arpa/inet.h>
40#include <linux/route.h>
41
42static inline int set_address(const char *address, struct sockaddr *sa) {
43    return inet_aton(address, &((struct sockaddr_in *)sa)->sin_addr);
44}
45
46/* current support the following routing entries */
47/* route add default dev wlan0 */
48/* route add default gw 192.168.1.1 dev wlan0 */
49/* route add -net 192.168.1.2 netmask 255.255.255.0 gw 192.168.1.1 */
50
51int route_main(int argc, char *argv[])
52{
53    struct rtentry rt = {
54        .rt_dst     = {.sa_family = AF_INET},
55        .rt_genmask = {.sa_family = AF_INET},
56        .rt_gateway = {.sa_family = AF_INET},
57    };
58
59    errno = EINVAL;
60    if (argc > 2 && !strcmp(argv[1], "add")) {
61        if (!strcmp(argv[2], "default")) {
62            /* route add default dev wlan0 */
63            if (argc > 4 && !strcmp(argv[3], "dev")) {
64                rt.rt_flags = RTF_UP;
65                rt.rt_dev = argv[4];
66                errno = 0;
67                goto apply;
68            }
69
70            /* route add default gw 192.168.1.1 dev wlan0 */
71            if (argc > 6 && !strcmp(argv[3], "gw") && !strcmp(argv[5], "dev")) {
72                rt.rt_flags = RTF_UP | RTF_GATEWAY;
73                rt.rt_dev = argv[6];
74                if (set_address(argv[4], &rt.rt_gateway)) {
75                    errno = 0;
76                }
77                goto apply;
78            }
79        }
80
81        /* route add -net 192.168.1.2 netmask 255.255.255.0 gw 192.168.1.1 */
82        if (argc > 7 && !strcmp(argv[2], "-net") &&
83            !strcmp(argv[4], "netmask") && !strcmp(argv[6], "gw")) {
84            rt.rt_flags = RTF_UP | RTF_GATEWAY;
85            if (set_address(argv[3], &rt.rt_dst) &&
86                set_address(argv[5], &rt.rt_genmask) &&
87                set_address(argv[7], &rt.rt_gateway)) {
88                errno = 0;
89            }
90            goto apply;
91        }
92    }
93
94apply:
95    if (!errno) {
96        int s = socket(AF_INET, SOCK_DGRAM, 0);
97        if (s != -1 && (ioctl(s, SIOCADDRT, &rt) != -1 || errno == EEXIST)) {
98            return 0;
99        }
100    }
101    puts(strerror(errno));
102    return errno;
103}
104