430 lines
9.3 KiB
C
430 lines
9.3 KiB
C
/* route
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*
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* Similar to the standard Unix route, but with only the necessary
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* parts for AF_INET
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*
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* Bjorn Wesen, Axis Communications AB
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*
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* Author of the original route:
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* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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* (derived from FvK's 'route.c 1.70 01/04/94')
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* $Id: route.c,v 1.11 2001/08/23 22:05:33 andersen Exp $
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*
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* displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
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* adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/route.h>
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#include <linux/param.h> // HZ
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <ctype.h>
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#include "busybox.h"
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#define _(x) x
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#define RTACTION_ADD 1
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#define RTACTION_DEL 2
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#define RTACTION_HELP 3
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#define RTACTION_FLUSH 4
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#define RTACTION_SHOW 5
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#define E_NOTFOUND 8
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#define E_SOCK 7
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#define E_LOOKUP 6
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#define E_VERSION 5
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#define E_USAGE 4
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#define E_OPTERR 3
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#define E_INTERN 2
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#define E_NOSUPP 1
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/* resolve XXX.YYY.ZZZ.QQQ -> binary */
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static int
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INET_resolve(char *name, struct sockaddr *sa)
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{
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struct sockaddr_in *s_in = (struct sockaddr_in *)sa;
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s_in->sin_family = AF_INET;
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s_in->sin_port = 0;
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/* Default is special, meaning 0.0.0.0. */
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if (strcmp(name, "default")==0) {
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s_in->sin_addr.s_addr = INADDR_ANY;
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return 1;
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}
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/* Look to see if it's a dotted quad. */
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if (inet_aton(name, &s_in->sin_addr)) {
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return 0;
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}
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/* guess not.. */
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return -1;
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}
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#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */
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#define HAVE_NEW_ADDRT 1
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#endif
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#ifdef RTF_IRTT /* route */
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#define HAVE_RTF_IRTT 1
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#endif
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#ifdef RTF_REJECT /* route */
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#define HAVE_RTF_REJECT 1
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#endif
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#if HAVE_NEW_ADDRT
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#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
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#define full_mask(x) (x)
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#else
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#define mask_in_addr(x) ((x).rt_genmask)
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#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
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#endif
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/* add or delete a route depending on action */
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static int
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INET_setroute(int action, int options, char **args)
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{
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struct rtentry rt;
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char target[128], gateway[128] = "NONE", netmask[128] = "default";
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int xflag, isnet;
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int skfd;
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xflag = 0;
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if (*args == NULL)
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show_usage();
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if (strcmp(*args, "-net")==0) {
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xflag = 1;
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args++;
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} else if (strcmp(*args, "-host")==0) {
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xflag = 2;
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args++;
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}
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safe_strncpy(target, *args++, (sizeof target));
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/* Clean out the RTREQ structure. */
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memset((char *) &rt, 0, sizeof(struct rtentry));
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if ((isnet = INET_resolve(target, &rt.rt_dst)) < 0) {
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error_msg(_("can't resolve %s"), target);
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return EXIT_FAILURE; /* XXX change to E_something */
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}
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switch (xflag) {
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case 1:
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isnet = 1;
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break;
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case 2:
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isnet = 0;
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break;
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default:
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break;
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}
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/* Fill in the other fields. */
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rt.rt_flags = (RTF_UP | RTF_HOST);
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if (isnet)
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rt.rt_flags &= ~RTF_HOST;
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while (*args) {
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if (strcmp(*args, "metric")==0) {
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int metric;
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args++;
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if (!*args || !isdigit(**args))
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show_usage();
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metric = atoi(*args);
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#if HAVE_NEW_ADDRT
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rt.rt_metric = metric + 1;
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#else
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ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */
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#endif
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args++;
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continue;
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}
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if (strcmp(*args, "netmask")==0) {
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struct sockaddr mask;
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args++;
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if (!*args || mask_in_addr(rt))
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show_usage();
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safe_strncpy(netmask, *args, (sizeof netmask));
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if ((isnet = INET_resolve(netmask, &mask)) < 0) {
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error_msg(_("can't resolve netmask %s"), netmask);
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return E_LOOKUP;
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}
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rt.rt_genmask = full_mask(mask);
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args++;
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continue;
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}
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if (strcmp(*args, "gw")==0 || strcmp(*args, "gateway")==0) {
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args++;
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if (!*args)
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show_usage();
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if (rt.rt_flags & RTF_GATEWAY)
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show_usage();
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safe_strncpy(gateway, *args, (sizeof gateway));
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if ((isnet = INET_resolve(gateway, &rt.rt_gateway)) < 0) {
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error_msg(_("can't resolve gw %s"), gateway);
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return E_LOOKUP;
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}
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if (isnet) {
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error_msg(
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_("%s: cannot use a NETWORK as gateway!"),
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gateway);
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return E_OPTERR;
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}
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rt.rt_flags |= RTF_GATEWAY;
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args++;
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continue;
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}
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if (strcmp(*args, "mss")==0) {
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args++;
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rt.rt_flags |= RTF_MSS;
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if (!*args)
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show_usage();
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rt.rt_mss = atoi(*args);
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args++;
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if (rt.rt_mss < 64 || rt.rt_mss > 32768) {
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error_msg(_("Invalid MSS."));
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return E_OPTERR;
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}
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continue;
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}
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if (strcmp(*args, "window")==0) {
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args++;
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if (!*args)
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show_usage();
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rt.rt_flags |= RTF_WINDOW;
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rt.rt_window = atoi(*args);
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args++;
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if (rt.rt_window < 128) {
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error_msg(_("Invalid window."));
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return E_OPTERR;
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}
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continue;
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}
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if (strcmp(*args, "irtt")==0) {
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args++;
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if (!*args)
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show_usage();
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args++;
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#if HAVE_RTF_IRTT
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rt.rt_flags |= RTF_IRTT;
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rt.rt_irtt = atoi(*(args - 1));
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rt.rt_irtt *= (HZ / 100); /* FIXME */
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#if 0 /* FIXME: do we need to check anything of this? */
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if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
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error_msg(_("Invalid initial rtt."));
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return E_OPTERR;
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}
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#endif
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#else
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ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */
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#endif
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continue;
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}
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if (strcmp(*args, "reject")==0) {
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args++;
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#if HAVE_RTF_REJECT
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rt.rt_flags |= RTF_REJECT;
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#else
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ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */
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#endif
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continue;
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}
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if (strcmp(*args, "mod")==0) {
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args++;
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rt.rt_flags |= RTF_MODIFIED;
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continue;
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}
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if (strcmp(*args, "dyn")==0) {
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args++;
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rt.rt_flags |= RTF_DYNAMIC;
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continue;
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}
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if (strcmp(*args, "reinstate")==0) {
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args++;
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rt.rt_flags |= RTF_REINSTATE;
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continue;
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}
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if (strcmp(*args, "device")==0 || strcmp(*args, "dev")==0) {
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args++;
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if (rt.rt_dev || *args == NULL)
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show_usage();
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rt.rt_dev = *args++;
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continue;
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}
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/* nothing matches */
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if (!rt.rt_dev) {
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rt.rt_dev = *args++;
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if (*args)
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show_usage(); /* must be last to catch typos */
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} else {
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show_usage();
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}
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}
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#if HAVE_RTF_REJECT
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if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev)
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rt.rt_dev = "lo";
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#endif
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/* sanity checks.. */
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if (mask_in_addr(rt)) {
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unsigned long mask = mask_in_addr(rt);
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mask = ~ntohl(mask);
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if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
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error_msg(
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_("netmask %.8x doesn't make sense with host route"),
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(unsigned int)mask);
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return E_OPTERR;
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}
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if (mask & (mask + 1)) {
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error_msg(_("bogus netmask %s"), netmask);
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return E_OPTERR;
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}
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mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
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if (mask & ~mask_in_addr(rt)) {
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error_msg(_("netmask doesn't match route address"));
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return E_OPTERR;
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}
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}
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/* Fill out netmask if still unset */
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if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST)
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mask_in_addr(rt) = 0xffffffff;
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/* Create a socket to the INET kernel. */
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if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror("socket");
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return E_SOCK;
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}
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/* Tell the kernel to accept this route. */
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if (action == RTACTION_DEL) {
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if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
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perror("SIOCDELRT");
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close(skfd);
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return E_SOCK;
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}
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} else {
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if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
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perror("SIOCADDRT");
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close(skfd);
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return E_SOCK;
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}
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}
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/* Close the socket. */
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(void) close(skfd);
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return EXIT_SUCCESS;
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}
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static void displayroutes(void)
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{
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char buff[256];
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int nl = 0 ;
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struct in_addr dest;
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struct in_addr gw;
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struct in_addr mask;
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int flgs, ref, use, metric;
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char flags[4];
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unsigned long int d,g,m;
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char sdest[16], sgw[16];
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FILE *fp = xfopen("/proc/net/route", "r");
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while( fgets(buff, sizeof(buff), fp) != NULL ) {
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if(nl) {
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int ifl = 0;
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while(buff[ifl]!=' ' && buff[ifl]!='\t' && buff[ifl]!='\0')
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ifl++;
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buff[ifl]=0; /* interface */
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if(sscanf(buff+ifl+1, "%lx%lx%d%d%d%d%lx",
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&d, &g, &flgs, &ref, &use, &metric, &m)!=7) {
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error_msg_and_die( "Unsuported kernel route format\n");
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}
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if(nl==1) {
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printf("Kernel IP routing table\n"
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"Destination Gateway Genmask Flags Metric Ref Use Iface\n");
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} else {
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nl++;
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continue;
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}
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ifl = 0; /* parse flags */
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if(flgs&1)
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flags[ifl++]='U';
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if(flgs&2)
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flags[ifl++]='G';
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if(flgs&4)
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flags[ifl++]='H';
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flags[ifl]=0;
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dest.s_addr = d;
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gw.s_addr = g;
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mask.s_addr = m;
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strcpy(sdest, (dest.s_addr==0 ? "default" :
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inet_ntoa(dest)));
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strcpy(sgw, (gw.s_addr==0 ? "*" :
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inet_ntoa(gw)));
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printf("%-16s%-16s%-16s%-6s%-6d %-2d %7d %s\n",
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sdest, sgw,
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inet_ntoa(mask),
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flags, metric, ref, use, buff);
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}
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nl++;
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}
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}
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int route_main(int argc, char **argv)
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{
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int what = 0;
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argc--;
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argv++;
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if (*argv == NULL) {
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displayroutes();
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return EXIT_SUCCESS;
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} else {
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/* check verb */
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if (strcmp(*argv, "add")==0)
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what = RTACTION_ADD;
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else if (strcmp(*argv, "del")==0 || strcmp(*argv, "delete")==0)
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what = RTACTION_DEL;
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else if (strcmp(*argv, "flush")==0)
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what = RTACTION_FLUSH;
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else
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show_usage();
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}
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return INET_setroute(what, 0, ++argv);
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}
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