/* 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, * (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 1.14 2001/11/10 11:22:43 andersen Exp $ * * displayroute() code added by Vladimir N. Oleynik * adjustments by Larry Doolittle */ #include #include #include "inet_common.h" #include #include // HZ #include #include #include #include #include #include #include #include #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 #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"; const char *netmask = bb_INET_default; int xflag, isnet; int skfd; xflag = 0; if (*args == NULL) show_usage(); 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, (struct sockaddr_in *)&rt.rt_dst, xflag!=1)) < 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(); netmask = *args; if ((isnet = INET_resolve(netmask, (struct sockaddr_in *)&mask, 0)) < 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, (struct sockaddr_in *)&rt.rt_gateway, 1)) < 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; } #ifndef RTF_UP /* Keep this in sync with /usr/src/linux/include/linux/route.h */ #define RTF_UP 0x0001 /* route usable */ #define RTF_GATEWAY 0x0002 /* destination is a gateway */ #define RTF_HOST 0x0004 /* host entry (net otherwise) */ #define RTF_REINSTATE 0x0008 /* reinstate route after tmout */ #define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */ #define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */ #define RTF_MTU 0x0040 /* specific MTU for this route */ #ifndef RTF_MSS #define RTF_MSS RTF_MTU /* Compatibility :-( */ #endif #define RTF_WINDOW 0x0080 /* per route window clamping */ #define RTF_IRTT 0x0100 /* Initial round trip time */ #define RTF_REJECT 0x0200 /* Reject route */ #endif static void displayroutes(int noresolve) { 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[64]; unsigned long int d,g,m; char sdest[16], sgw[16]; FILE *fp = xfopen("/proc/net/route", "r"); if(noresolve) noresolve = 0x0fff; while( fgets(buff, sizeof(buff), fp) != NULL ) { if(nl) { int ifl = 0; int numeric; struct sockaddr_in s_addr; while(buff[ifl]!=' ' && buff[ifl]!='\t' && buff[ifl]!='\0') ifl++; buff[ifl]=0; /* interface */ if(sscanf(buff+ifl+1, "%lx%lx%X%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&RTF_UP) { if(flgs&RTF_REJECT) flags[ifl++]='!'; else flags[ifl++]='U'; if(flgs&RTF_GATEWAY) flags[ifl++]='G'; if(flgs&RTF_HOST) flags[ifl++]='H'; if(flgs&RTF_REINSTATE) flags[ifl++]='R'; if(flgs&RTF_DYNAMIC) flags[ifl++]='D'; if(flgs&RTF_MODIFIED) flags[ifl++]='M'; flags[ifl]=0; dest.s_addr = d; gw.s_addr = g; mask.s_addr = m; memset(&s_addr, 0, sizeof(struct sockaddr_in)); s_addr.sin_family = AF_INET; s_addr.sin_addr = dest; numeric = noresolve | 0x8000; /* default instead of * */ INET_rresolve(sdest, sizeof(sdest), &s_addr, numeric, m); numeric = noresolve | 0x4000; /* host instead of net */ s_addr.sin_addr = gw; INET_rresolve(sgw, sizeof(sgw), &s_addr, numeric, m); 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 || (*(argv+1)==NULL && strcmp(*argv, "-n")==0)) { displayroutes(*argv != NULL); 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); }