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Commit 4a1465fe authored by Chia-chi Yeh's avatar Chia-chi Yeh
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toolbox: Revise route utility. 

Add copyright header.
Returns errno when something goes wrong. Otherwise returns 0.
When the route entry exists, treat it as a success.
parent 9f9c951a
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toolbox/route.c
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/*
* Copyright (c) 2009, The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google, Inc. nor the names of its contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/sockios.h>
#include <arpa/inet.h>
#include <linux/route.h>
static void die(const char *fmt, ...)
{
va_list p;
va_start(p, fmt);
fprintf(stderr,"error(%s): ", strerror(errno));
fprintf(stderr, fmt, p);
va_end(p);
exit(-1);
static inline int set_address(const char *address, struct sockaddr *sa) {
return inet_aton(address, &((struct sockaddr_in *)sa)->sin_addr);
}
static inline void init_sockaddr_in(struct sockaddr_in *sin, const char *addr)
{
sin->sin_family = AF_INET;
sin->sin_port = 0;
sin->sin_addr.s_addr = inet_addr(addr);
}
#define ADVANCE(argc, argv) do { argc--, argv++; } while(0)
#define EXPECT_NEXT(argc, argv) do { \
ADVANCE(argc, argv); \
if (0 == argc) { \
errno = EINVAL; \
die("expecting one more argument"); \
} \
} while(0)
/* current support the following routing entries */
/* route add default dev wlan0 */
/* route add default gw 192.168.20.1 dev wlan0 */
/* route add net 192.168.1.1 netmask 255.255.255.0 gw 172.24.192.10 */
/* route add default gw 192.168.1.1 dev wlan0 */
/* route add -net 192.168.1.2 netmask 255.255.255.0 gw 192.168.1.1 */
int route_main(int argc, char *argv[])
{
struct ifreq ifr;
int s,i;
struct rtentry rt;
struct sockaddr_in ina;
if (!argc)
return 0;
strncpy(ifr.ifr_name, argv[0], IFNAMSIZ);
ifr.ifr_name[IFNAMSIZ-1] = 0;
ADVANCE(argc, argv);
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
die("cannot open control socket\n");
struct rtentry rt = {
.rt_dst = {.sa_family = AF_INET},
.rt_genmask = {.sa_family = AF_INET},
.rt_gateway = {.sa_family = AF_INET},
};
errno = EINVAL;
if (argc > 2 && !strcmp(argv[1], "add")) {
if (!strcmp(argv[2], "default")) {
/* route add default dev wlan0 */
if (argc > 4 && !strcmp(argv[3], "dev")) {
rt.rt_flags = RTF_UP | RTF_HOST;
rt.rt_dev = argv[4];
errno = 0;
goto apply;
}
while(argc > 0){
if (!strcmp(argv[0], "add")) {
EXPECT_NEXT(argc, argv);
if (!strcmp(argv[0], "default")) {
EXPECT_NEXT(argc, argv);
memset((char *) &rt, 0, sizeof(struct rtentry));
rt.rt_dst.sa_family = AF_INET;
if(!strcmp(argv[0], "dev")) {
EXPECT_NEXT(argc, argv);
rt.rt_flags = RTF_UP | RTF_HOST;
rt.rt_dev = argv[0];
if (ioctl(s, SIOCADDRT, &rt) < 0)
die("SIOCADDRT\n");
} else if (!strcmp(argv[0], "gw")) {
EXPECT_NEXT(argc, argv);
/* route add default gw 192.168.1.1 dev wlan0 */
if (argc > 6 && !strcmp(argv[3], "gw") && !strcmp(argv[5], "dev")) {
rt.rt_flags = RTF_UP | RTF_GATEWAY;
init_sockaddr_in((struct sockaddr_in *)&(rt.rt_genmask), "0.0.0.0");
if(isdigit(argv[0][0])) {
init_sockaddr_in((struct sockaddr_in *)&(rt.rt_gateway), argv[0]);
} else {
die("expecting an IP address for parameter \"gw\"\n");
}
EXPECT_NEXT(argc, argv);
if (!strcmp(argv[0], "dev")) {
EXPECT_NEXT(argc, argv);
rt.rt_dev = argv[0];
if (ioctl(s, SIOCADDRT, &rt) < 0) {
die("SIOCADDRT\n");
rt.rt_dev = argv[6];
if (set_address(argv[4], &rt.rt_gateway)) {
errno = 0;
}
goto apply;
}
}
} else {
char keywords[3][10] = { "-net", "netmask", "gw" };
struct sockaddr_in *paddr[3] = { &rt.rt_dst, &rt.rt_genmask, &rt.rt_gateway };
int k = 0;
memset((char *) &rt, 0, sizeof(struct rtentry));
/* route add -net 192.168.1.2 netmask 255.255.255.0 gw 192.168.1.1 */
if (argc > 7 && !strcmp(argv[2], "-net") &&
!strcmp(argv[4], "netmask") && !strcmp(argv[6], "gw")) {
rt.rt_flags = RTF_UP | RTF_GATEWAY;
do {
if (!strcmp(argv[0], keywords[k])) {
EXPECT_NEXT(argc, argv);
if (isdigit(argv[0][0])) {
init_sockaddr_in(paddr[k], argv[0]);
} else {
die("expecting an IP/MASK address for parameter %s\n", keywords[k]);
}
if (k < 2)
EXPECT_NEXT(argc, argv);
} else {
die("expecting keyword(s)\n");
}
} while (++k < 3);
if (ioctl(s, SIOCADDRT, &rt) < 0) {
die("SIOCADDRT\n");
if (set_address(argv[3], &rt.rt_dst) &&
set_address(argv[5], &rt.rt_genmask) &&
set_address(argv[7], &rt.rt_gateway)) {
errno = 0;
}
goto apply;
}
}
ADVANCE(argc, argv);
}
apply:
if (!errno) {
int s = socket(AF_INET, SOCK_DGRAM, 0);
if (s != -1 && (ioctl(s, SIOCADDRT, &rt) != -1 || errno == EEXIST)) {
return 0;
}
}
puts(strerror(errno));
return errno;
}
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