/* route
*
* Similar to the standard Unix route, but with only the necessary
* parts for AF_INET
*
* Bjorn Wesen, Axis Communications AB
*
* Author of the original route:
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* (derived from FvK's 'route.c 1.70 01/04/94')
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* $Id: route.c,v 1.1 2001/02/14 08:11:27 andersen Exp $
*
*/
#include "busybox.h"
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/route.h>
#include <linux/param.h> // HZ
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <ctype.h>
#define _(x) x
#define RTACTION_ADD 1
#define RTACTION_DEL 2
#define RTACTION_HELP 3
#define RTACTION_FLUSH 4
#define RTACTION_SHOW 5
#define E_NOTFOUND 8
#define E_SOCK 7
#define E_LOOKUP 6
#define E_VERSION 5
#define E_USAGE 4
#define E_OPTERR 3
#define E_INTERN 2
#define E_NOSUPP 1
/* resolve XXX.YYY.ZZZ.QQQ -> binary */
static int
INET_resolve(char *name, struct sockaddr *sa)
{
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
sin->sin_family = AF_INET;
sin->sin_port = 0;
/* Default is special, meaning 0.0.0.0. */
if (!strcmp(name, "default")) {
sin->sin_addr.s_addr = INADDR_ANY;
return (1);
}
/* Look to see if it's a dotted quad. */
if (inet_aton(name, &sin->sin_addr)) {
return 0;
}
/* guess not.. */
return -1;
}
#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */
#define HAVE_NEW_ADDRT 1
#endif
#ifdef RTF_IRTT /* route */
#define HAVE_RTF_IRTT 1
#endif
#ifdef RTF_REJECT /* route */
#define HAVE_RTF_REJECT 1
#endif
#if HAVE_NEW_ADDRT
#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
#define full_mask(x) (x)
#else
#define mask_in_addr(x) ((x).rt_genmask)
#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
#endif
/* add or delete a route depending on action */
static int
INET_setroute(int action, int options, char **args)
{
struct rtentry rt;
char target[128], gateway[128] = "NONE", netmask[128] = "default";
int xflag, isnet;
int skfd;
xflag = 0;
if (!strcmp(*args, "-net")) {
xflag = 1;
args++;
} else if (!strcmp(*args, "-host")) {
xflag = 2;
args++;
}
if (*args == NULL)
usage(route_usage);
safe_strncpy(target, *args++, (sizeof target));
/* Clean out the RTREQ structure. */
memset((char *) &rt, 0, sizeof(struct rtentry));
if ((isnet = INET_resolve(target, &rt.rt_dst)) < 0) {
fprintf(stderr, "cant resolve %s\n", target);
return (1);
}
switch (xflag) {
case 1:
isnet = 1;
break;
case 2:
isnet = 0;
break;
default:
break;
}
/* Fill in the other fields. */
rt.rt_flags = (RTF_UP | RTF_HOST);
if (isnet)
rt.rt_flags &= ~RTF_HOST;
while (*args) {
if (!strcmp(*args, "metric")) {
int metric;
args++;
if (!*args || !isdigit(**args))
usage(route_usage);
metric = atoi(*args);
#if HAVE_NEW_ADDRT
rt.rt_metric = metric + 1;
#else
ENOSUPP("inet_setroute", "NEW_ADDRT (metric)");
#endif
args++;
continue;
}
if (!strcmp(*args, "netmask")) {
struct sockaddr mask;
args++;
if (!*args || mask_in_addr(rt))
usage(route_usage);
safe_strncpy(netmask, *args, (sizeof netmask));
if ((isnet = INET_resolve(netmask, &mask)) < 0) {
fprintf(stderr, "cant resolve netmask %s\n", netmask);
return (E_LOOKUP);
}
rt.rt_genmask = full_mask(mask);
args++;
continue;
}
if (!strcmp(*args, "gw") || !strcmp(*args, "gateway")) {
args++;
if (!*args)
usage(route_usage);
if (rt.rt_flags & RTF_GATEWAY)
usage(route_usage);
safe_strncpy(gateway, *args, (sizeof gateway));
if ((isnet = INET_resolve(gateway, &rt.rt_gateway)) < 0) {
fprintf(stderr, "cant resolve gw %s\n", gateway);
return (E_LOOKUP);
}
if (isnet) {
fprintf(stderr,
_("route: %s: cannot use a NETWORK as gateway!\n"),
gateway);
return (E_OPTERR);
}
rt.rt_flags |= RTF_GATEWAY;
args++;
continue;
}
if (!strcmp(*args, "mss")) {
args++;
rt.rt_flags |= RTF_MSS;
if (!*args)
usage(route_usage);
rt.rt_mss = atoi(*args);
args++;
if (rt.rt_mss < 64 || rt.rt_mss > 32768) {
fprintf(stderr, _("route: Invalid MSS.\n"));
return (E_OPTERR);
}
continue;
}
if (!strcmp(*args, "window")) {
args++;
if (!*args)
usage(route_usage);
rt.rt_flags |= RTF_WINDOW;
rt.rt_window = atoi(*args);
args++;
if (rt.rt_window < 128) {
fprintf(stderr, _("route: Invalid window.\n"));
return (E_OPTERR);
}
continue;
}
if (!strcmp(*args, "irtt")) {
args++;
if (!*args)
usage(route_usage);
args++;
#if HAVE_RTF_IRTT
rt.rt_flags |= RTF_IRTT;
rt.rt_irtt = atoi(*(args - 1));
rt.rt_irtt *= (HZ / 100); /* FIXME */
#if 0 /* FIXME: do we need to check anything of this? */
if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
fprintf(stderr, _("route: Invalid initial rtt.\n"));
return (E_OPTERR);
}
#endif
#else
ENOSUPP("inet_setroute", "RTF_IRTT");
#endif
continue;
}
if (!strcmp(*args, "reject")) {
args++;
#if HAVE_RTF_REJECT
rt.rt_flags |= RTF_REJECT;
#else
ENOSUPP("inet_setroute", "RTF_REJECT");
#endif
continue;
}
if (!strcmp(*args, "mod")) {
args++;
rt.rt_flags |= RTF_MODIFIED;
continue;
}
if (!strcmp(*args, "dyn")) {
args++;
rt.rt_flags |= RTF_DYNAMIC;
continue;
}
if (!strcmp(*args, "reinstate")) {
args++;
rt.rt_flags |= RTF_REINSTATE;
continue;
}
if (!strcmp(*args, "device") || !strcmp(*args, "dev")) {
args++;
if (rt.rt_dev || *args == NULL)
usage(route_usage);
rt.rt_dev = *args++;
continue;
}
/* nothing matches */
if (!rt.rt_dev) {
rt.rt_dev = *args++;
if (*args)
usage(route_usage); /* must be last to catch typos */
} else
usage(route_usage);
}
#if HAVE_RTF_REJECT
if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev)
rt.rt_dev = "lo";
#endif
/* sanity checks.. */
if (mask_in_addr(rt)) {
unsigned long mask = mask_in_addr(rt);
mask = ~ntohl(mask);
if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
fprintf(stderr,
_("route: netmask %.8x doesn't make sense with host route\n"),
(unsigned int)mask);
return (E_OPTERR);
}
if (mask & (mask + 1)) {
fprintf(stderr, _("route: bogus netmask %s\n"), netmask);
return (E_OPTERR);
}
mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
if (mask & ~mask_in_addr(rt)) {
fprintf(stderr, _("route: netmask doesn't match route address\n"));
return (E_OPTERR);
}
}
/* Fill out netmask if still unset */
if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST)
mask_in_addr(rt) = 0xffffffff;
/* Create a socket to the INET kernel. */
if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return (E_SOCK);
}
/* Tell the kernel to accept this route. */
if (action == RTACTION_DEL) {
if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
perror("SIOCDELRT");
close(skfd);
return (E_SOCK);
}
} else {
if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
perror("SIOCADDRT");
close(skfd);
return (E_SOCK);
}
}
/* Close the socket. */
(void) close(skfd);
return (0);
}
int route_main(int argc, char **argv)
{
int what = 0;
argc--;
argv++;
if (*argv == NULL) {
//displayroutes();
fprintf(stderr, "print routes is not implemented yet\n");
usage(route_usage);
} else {
/* check verb */
if (!strcmp(*argv, "add"))
what = RTACTION_ADD;
else if (!strcmp(*argv, "del") || !strcmp(*argv, "delete"))
what = RTACTION_DEL;
else if (!strcmp(*argv, "flush"))
what = RTACTION_FLUSH;
else
usage(route_usage);
}
INET_setroute(what, 0, ++argv);
exit(0);
}