| /* 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 1.9 2001/03/09 21:24:12 andersen Exp $ |
| * |
| * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru> |
| * adjustments by Larry Doolittle <LRDoolittle@lbl.gov> |
| */ |
| |
| #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> |
| #include "busybox.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")==0) { |
| 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")==0) { |
| xflag = 1; |
| args++; |
| } else if (strcmp(*args, "-host")==0) { |
| xflag = 2; |
| args++; |
| } |
| if (*args == NULL) |
| show_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) { |
| error_msg(_("can't resolve %s"), target); |
| return EXIT_FAILURE; /* XXX change to E_something */ |
| } |
| |
| 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")==0) { |
| int metric; |
| |
| args++; |
| if (!*args || !isdigit(**args)) |
| show_usage(); |
| metric = atoi(*args); |
| #if HAVE_NEW_ADDRT |
| rt.rt_metric = metric + 1; |
| #else |
| ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */ |
| #endif |
| args++; |
| continue; |
| } |
| |
| if (strcmp(*args, "netmask")==0) { |
| struct sockaddr mask; |
| |
| args++; |
| if (!*args || mask_in_addr(rt)) |
| show_usage(); |
| safe_strncpy(netmask, *args, (sizeof netmask)); |
| if ((isnet = INET_resolve(netmask, &mask)) < 0) { |
| error_msg(_("can't resolve netmask %s"), netmask); |
| return E_LOOKUP; |
| } |
| rt.rt_genmask = full_mask(mask); |
| args++; |
| continue; |
| } |
| |
| if (strcmp(*args, "gw")==0 || strcmp(*args, "gateway")==0) { |
| args++; |
| if (!*args) |
| show_usage(); |
| if (rt.rt_flags & RTF_GATEWAY) |
| show_usage(); |
| safe_strncpy(gateway, *args, (sizeof gateway)); |
| if ((isnet = INET_resolve(gateway, &rt.rt_gateway)) < 0) { |
| error_msg(_("can't resolve gw %s"), gateway); |
| return E_LOOKUP; |
| } |
| if (isnet) { |
| error_msg( |
| _("%s: cannot use a NETWORK as gateway!"), |
| gateway); |
| return E_OPTERR; |
| } |
| rt.rt_flags |= RTF_GATEWAY; |
| args++; |
| continue; |
| } |
| |
| if (strcmp(*args, "mss")==0) { |
| args++; |
| rt.rt_flags |= RTF_MSS; |
| if (!*args) |
| show_usage(); |
| rt.rt_mss = atoi(*args); |
| args++; |
| if (rt.rt_mss < 64 || rt.rt_mss > 32768) { |
| error_msg(_("Invalid MSS.")); |
| return E_OPTERR; |
| } |
| continue; |
| } |
| |
| if (strcmp(*args, "window")==0) { |
| args++; |
| if (!*args) |
| show_usage(); |
| rt.rt_flags |= RTF_WINDOW; |
| rt.rt_window = atoi(*args); |
| args++; |
| if (rt.rt_window < 128) { |
| error_msg(_("Invalid window.")); |
| return E_OPTERR; |
| } |
| continue; |
| } |
| |
| if (strcmp(*args, "irtt")==0) { |
| args++; |
| if (!*args) |
| show_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)) { |
| error_msg(_("Invalid initial rtt.")); |
| return E_OPTERR; |
| } |
| #endif |
| #else |
| ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */ |
| #endif |
| continue; |
| } |
| |
| if (strcmp(*args, "reject")==0) { |
| args++; |
| #if HAVE_RTF_REJECT |
| rt.rt_flags |= RTF_REJECT; |
| #else |
| ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */ |
| #endif |
| continue; |
| } |
| if (strcmp(*args, "mod")==0) { |
| args++; |
| rt.rt_flags |= RTF_MODIFIED; |
| continue; |
| } |
| if (strcmp(*args, "dyn")==0) { |
| args++; |
| rt.rt_flags |= RTF_DYNAMIC; |
| continue; |
| } |
| if (strcmp(*args, "reinstate")==0) { |
| args++; |
| rt.rt_flags |= RTF_REINSTATE; |
| continue; |
| } |
| if (strcmp(*args, "device")==0 || strcmp(*args, "dev")==0) { |
| args++; |
| if (rt.rt_dev || *args == NULL) |
| show_usage(); |
| rt.rt_dev = *args++; |
| continue; |
| } |
| /* nothing matches */ |
| if (!rt.rt_dev) { |
| rt.rt_dev = *args++; |
| if (*args) |
| show_usage(); /* must be last to catch typos */ |
| } else { |
| show_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) { |
| error_msg( |
| _("netmask %.8x doesn't make sense with host route"), |
| (unsigned int)mask); |
| return E_OPTERR; |
| } |
| if (mask & (mask + 1)) { |
| error_msg(_("bogus netmask %s"), netmask); |
| return E_OPTERR; |
| } |
| mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr; |
| if (mask & ~mask_in_addr(rt)) { |
| error_msg(_("netmask doesn't match route address")); |
| 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 EXIT_SUCCESS; |
| } |
| |
| static void displayroutes(void) |
| { |
| char buff[256]; |
| int nl = 0 ; |
| struct in_addr dest; |
| struct in_addr gw; |
| struct in_addr mask; |
| int flgs, ref, use, metric; |
| char flags[4]; |
| unsigned long int d,g,m; |
| |
| char sdest[16], sgw[16]; |
| |
| |
| FILE *fp = xfopen("/proc/net/route", "r"); |
| |
| while( fgets(buff, sizeof(buff), fp) != NULL ) { |
| if(nl) { |
| int ifl = 0; |
| while(buff[ifl]!=' ' && buff[ifl]!='\t' && buff[ifl]!='\0') |
| ifl++; |
| buff[ifl]=0; /* interface */ |
| if(sscanf(buff+ifl+1, "%lx%lx%d%d%d%d%lx", |
| &d, &g, &flgs, &ref, &use, &metric, &m)!=7) { |
| error_msg_and_die( "Unsuported kernel route format\n"); |
| } |
| if(nl==1) { |
| printf("Kernel IP routing table\n" |
| "Destination Gateway Genmask Flags Metric Ref Use Iface\n"); |
| } |
| |
| |
| ifl = 0; /* parse flags */ |
| if(flgs&1) |
| flags[ifl++]='U'; |
| if(flgs&2) |
| flags[ifl++]='G'; |
| if(flgs&4) |
| flags[ifl++]='H'; |
| flags[ifl]=0; |
| dest.s_addr = d; |
| gw.s_addr = g; |
| mask.s_addr = m; |
| strcpy(sdest, (dest.s_addr==0 ? "default" : |
| inet_ntoa(dest))); |
| strcpy(sgw, (gw.s_addr==0 ? "*" : |
| inet_ntoa(gw))); |
| printf("%-16s%-16s%-16s%-6s%-6d %-2d %7d %s\n", |
| sdest, sgw, |
| inet_ntoa(mask), |
| flags, metric, ref, use, buff); |
| } |
| nl++; |
| } |
| } |
| |
| int route_main(int argc, char **argv) |
| { |
| int what = 0; |
| |
| argc--; |
| argv++; |
| |
| if (*argv == NULL) { |
| displayroutes(); |
| return EXIT_SUCCESS; |
| } else { |
| /* check verb */ |
| if (strcmp(*argv, "add")==0) |
| what = RTACTION_ADD; |
| else if (strcmp(*argv, "del")==0 || strcmp(*argv, "delete")==0) |
| what = RTACTION_DEL; |
| else if (strcmp(*argv, "flush")==0) |
| what = RTACTION_FLUSH; |
| else |
| show_usage(); |
| } |
| |
| return INET_setroute(what, 0, ++argv); |
| } |