X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=networking%2Froute.c;h=0146fa02914c05f236696eb655a5b98ffc6ed7fd;hb=defc1ea34074e7882724c460260d307cdf981a70;hp=d98d9a0b6248f1f4ca6b10c6caec3701aabd6e52;hpb=f1bbb22dca4d39aa227246f4c2ee90acd7e512a4;p=oweals%2Fbusybox.git diff --git a/networking/route.c b/networking/route.c index d98d9a0b6..0146fa029 100644 --- a/networking/route.c +++ b/networking/route.c @@ -1,92 +1,56 @@ +/* vi: set sw=4 ts=4: */ /* route * * Similar to the standard Unix route, but with only the necessary - * parts for AF_INET + * parts for AF_INET and AF_INET6 * * Bjorn Wesen, Axis Communications AB * - * Author of the original route: + * 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. + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * - * $Id: route.c,v 1.6 2001/02/18 20:12:25 andersen Exp $ * * displayroute() code added by Vladimir N. Oleynik - * busybox style adjustments by Larry Doolittle - * displayroute() format now matches net-tools-1.57/lib/inet_gr.c line 173. + * adjustments by Larry Doolittle + * + * IPV6 support added by Bart Visscher */ -#include "busybox.h" -#include -#include -#include -#include -#include // HZ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#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; -} +/* 2004/03/09 Manuel Novoa III + * + * Rewritten to fix several bugs, add additional error checking, and + * remove ridiculous amounts of bloat. + */ -#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */ -#define HAVE_NEW_ADDRT 1 +#include +#include + +#include "libbb.h" +#include "inet_common.h" + + +#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 -#ifdef RTF_IRTT /* route */ -#define HAVE_RTF_IRTT 1 +#define RTF_WINDOW 0x0080 /* per route window clamping */ +#define RTF_IRTT 0x0100 /* Initial round trip time */ +#define RTF_REJECT 0x0200 /* Reject route */ #endif -#ifdef RTF_REJECT /* route */ -#define HAVE_RTF_REJECT 1 + +#if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */ +#define HAVE_NEW_ADDRT 1 #endif #if HAVE_NEW_ADDRT @@ -97,333 +61,639 @@ INET_resolve(char *name, struct sockaddr *sa) #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr) #endif -/* add or delete a route depending on action */ +/* The RTACTION entries must agree with tbl_verb[] below! */ +#define RTACTION_ADD 1 +#define RTACTION_DEL 2 + +/* For the various tbl_*[] arrays, the 1st byte is the offset to + * the next entry and the 2nd byte is return value. */ + +#define NET_FLAG 1 +#define HOST_FLAG 2 + +/* We remap '-' to '#' to avoid problems with getopt. */ +static const char tbl_hash_net_host[] ALIGN1 = + "\007\001#net\0" +/* "\010\002#host\0" */ + "\007\002#host" /* Since last, we can save a byte. */ +; + +#define KW_TAKES_ARG 020 +#define KW_SETS_FLAG 040 + +#define KW_IPVx_METRIC 020 +#define KW_IPVx_NETMASK 021 +#define KW_IPVx_GATEWAY 022 +#define KW_IPVx_MSS 023 +#define KW_IPVx_WINDOW 024 +#define KW_IPVx_IRTT 025 +#define KW_IPVx_DEVICE 026 + +#define KW_IPVx_FLAG_ONLY 040 +#define KW_IPVx_REJECT 040 +#define KW_IPVx_MOD 041 +#define KW_IPVx_DYN 042 +#define KW_IPVx_REINSTATE 043 + +static const char tbl_ipvx[] ALIGN1 = + /* 020 is the "takes an arg" bit */ +#if HAVE_NEW_ADDRT + "\011\020metric\0" +#endif + "\012\021netmask\0" + "\005\022gw\0" + "\012\022gateway\0" + "\006\023mss\0" + "\011\024window\0" +#ifdef RTF_IRTT + "\007\025irtt\0" +#endif + "\006\026dev\0" + "\011\026device\0" + /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */ +#ifdef RTF_REJECT + "\011\040reject\0" +#endif + "\006\041mod\0" + "\006\042dyn\0" +/* "\014\043reinstate\0" */ + "\013\043reinstate" /* Since last, we can save a byte. */ +; + +static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */ +#ifdef RTF_REJECT + RTF_REJECT, +#endif + RTF_MODIFIED, + RTF_DYNAMIC, + RTF_REINSTATE +}; -static int -INET_setroute(int action, int options, char **args) +static int kw_lookup(const char *kwtbl, char ***pargs) { - 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 (**pargs) { + do { + if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */ + *pargs += 1; + if (kwtbl[1] & KW_TAKES_ARG) { + if (!**pargs) { /* No more args! */ + bb_show_usage(); + } + *pargs += 1; /* Calling routine will use args[-1]. */ + } + return kwtbl[1]; + } + kwtbl += *kwtbl; + } while (*kwtbl); } - if (*args == NULL) - show_usage(); + return 0; +} + +/* Add or delete a route, depending on action. */ - safe_strncpy(target, *args++, (sizeof target)); +static void INET_setroute(int action, char **args) +{ + struct rtentry rt; + const char *netmask = NULL; + int skfd, isnet, xflag; + + /* Grab the -net or -host options. Remember they were transformed. */ + xflag = kw_lookup(tbl_hash_net_host, &args); + + /* If we did grab -net or -host, make sure we still have an arg left. */ + if (*args == NULL) { + bb_show_usage(); + } /* Clean out the RTREQ structure. */ - memset((char *) &rt, 0, sizeof(struct rtentry)); + memset(&rt, 0, sizeof(rt)); + + { + const char *target = *args++; + char *prefix; + /* recognize x.x.x.x/mask format. */ + prefix = strchr(target, '/'); + if (prefix) { + int prefix_len; - if ((isnet = INET_resolve(target, &rt.rt_dst)) < 0) { - error_msg(_("can't resolve %s"), target); - return EXIT_FAILURE; /* XXX change to E_something */ + prefix_len = xatoul_range(prefix+1, 0, 32); + mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len)); + *prefix = '\0'; +#if HAVE_NEW_ADDRT + rt.rt_genmask.sa_family = AF_INET; +#endif + } else { + /* Default netmask. */ + netmask = bb_str_default; + } + /* Prefer hostname lookup is -host flag (xflag==1) was given. */ + isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst, + (xflag & HOST_FLAG)); + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", target); + } + if (prefix) { + /* do not destroy prefix for process args */ + *prefix = '/'; + } } - switch (xflag) { - case 1: - isnet = 1; - break; - - case 2: - isnet = 0; - break; - - default: - break; + if (xflag) { /* Reinit isnet if -net or -host was specified. */ + isnet = (xflag & NET_FLAG); } - + /* Fill in the other fields. */ - rt.rt_flags = (RTF_UP | RTF_HOST); - if (isnet) - rt.rt_flags &= ~RTF_HOST; + rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST)); while (*args) { - if (strcmp(*args, "metric")==0) { - int metric; - - args++; - if (!*args || !isdigit(**args)) - show_usage(); - metric = atoi(*args); + int k = kw_lookup(tbl_ipvx, &args); + const char *args_m1 = args[-1]; + + if (k & KW_IPVx_FLAG_ONLY) { + rt.rt_flags |= flags_ipvx[k & 3]; + continue; + } + #if HAVE_NEW_ADDRT - rt.rt_metric = metric + 1; -#else - ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */ -#endif - args++; + if (k == KW_IPVx_METRIC) { + rt.rt_metric = xatoul(args_m1) + 1; continue; } +#endif - if (strcmp(*args, "netmask")==0) { + if (k == KW_IPVx_NETMASK) { 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; + + if (mask_in_addr(rt)) { + bb_show_usage(); + } + + netmask = args_m1; + isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0); + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", netmask); } 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 (k == KW_IPVx_GATEWAY) { + if (rt.rt_flags & RTF_GATEWAY) { + bb_show_usage(); } + + isnet = INET_resolve(args_m1, + (struct sockaddr_in *) &rt.rt_gateway, 1); + rt.rt_flags |= RTF_GATEWAY; + if (isnet) { - error_msg( - _("%s: cannot use a NETWORK as gateway!"), - gateway); - return E_OPTERR; + if (isnet < 0) { + bb_error_msg_and_die("resolving %s", args_m1); + } + bb_error_msg_and_die("gateway %s is a NETWORK", args_m1); } - rt.rt_flags |= RTF_GATEWAY; - args++; continue; } - if (strcmp(*args, "mss")==0) { - args++; + if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */ 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; - } + rt.rt_mss = xatoul_range(args_m1, 64, 32768); continue; } - if (strcmp(*args, "window")==0) { - args++; - if (!*args) - show_usage(); + if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */ rt.rt_flags |= RTF_WINDOW; - rt.rt_window = atoi(*args); - args++; - if (rt.rt_window < 128) { - error_msg(_("Invalid window.")); - return E_OPTERR; - } + rt.rt_window = xatoul_range(args_m1, 128, INT_MAX); continue; } - if (strcmp(*args, "irtt")==0) { - args++; - if (!*args) - show_usage(); - args++; -#if HAVE_RTF_IRTT +#ifdef RTF_IRTT + if (k == KW_IPVx_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? */ + rt.rt_irtt = xatoul(args_m1); + rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 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; + bb_error_msg_and_die("bad irtt"); } -#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 + + /* Device is special in that it can be the last arg specified + * and doesn't requre the dev/device keyword in that case. */ + if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { + /* Don't use args_m1 here since args may have changed! */ + rt.rt_dev = args[-1]; 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(); - } + + /* Nothing matched. */ + bb_show_usage(); } -#if HAVE_RTF_REJECT - if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) - rt.rt_dev = "lo"; +#ifdef RTF_REJECT + if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) { + rt.rt_dev = (char*)"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; + bb_error_msg_and_die("netmask %.8x and host route conflict", + (unsigned int) mask); } if (mask & (mask + 1)) { - error_msg(_("bogus netmask %s"), netmask); - return E_OPTERR; + bb_error_msg_and_die("bogus netmask %s", netmask); } 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; + bb_error_msg_and_die("netmask and route address conflict"); } } + /* Fill out netmask if still unset */ - if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST) + 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; + skfd = xsocket(AF_INET, SOCK_DGRAM, 0); + + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, &rt); + else + xioctl(skfd, SIOCDELRT, &rt); + + if (ENABLE_FEATURE_CLEAN_UP) close(skfd); +} + +#if ENABLE_FEATURE_IPV6 + +static void INET6_setroute(int action, char **args) +{ + struct sockaddr_in6 sa6; + struct in6_rtmsg rt; + int prefix_len, skfd; + const char *devname; + + /* We know args isn't NULL from the check in route_main. */ + const char *target = *args++; + + if (strcmp(target, bb_str_default) == 0) { + prefix_len = 0; + memset(&sa6, 0, sizeof(sa6)); + } else { + char *cp; + cp = strchr(target, '/'); /* Yes... const to non is ok. */ + if (cp) { + *cp = '\0'; + prefix_len = xatoul_range(cp + 1, 0, 128); + } else { + prefix_len = 128; + } + if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) { + bb_error_msg_and_die("resolving %s", target); + } } - } else { - if (ioctl(skfd, SIOCADDRT, &rt) < 0) { - perror("SIOCADDRT"); - close(skfd); - return E_SOCK; + + /* Clean out the RTREQ structure. */ + memset(&rt, 0, sizeof(rt)); + + memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); + + /* Fill in the other fields. */ + rt.rtmsg_dst_len = prefix_len; + rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP); + rt.rtmsg_metric = 1; + + devname = NULL; + + while (*args) { + int k = kw_lookup(tbl_ipvx, &args); + const char *args_m1 = args[-1]; + + if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) { + rt.rtmsg_flags |= flags_ipvx[k & 3]; + continue; + } + + if (k == KW_IPVx_METRIC) { + rt.rtmsg_metric = xatoul(args_m1); + continue; + } + + if (k == KW_IPVx_GATEWAY) { + if (rt.rtmsg_flags & RTF_GATEWAY) { + bb_show_usage(); + } + + if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) { + bb_error_msg_and_die("resolving %s", args_m1); + } + memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr, + sizeof(struct in6_addr)); + rt.rtmsg_flags |= RTF_GATEWAY; + continue; + } + + /* Device is special in that it can be the last arg specified + * and doesn't requre the dev/device keyword in that case. */ + if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { + /* Don't use args_m1 here since args may have changed! */ + devname = args[-1]; + continue; } + + /* Nothing matched. */ + bb_show_usage(); } - - /* Close the socket. */ - (void) close(skfd); - return EXIT_SUCCESS; + + /* Create a socket to the INET6 kernel. */ + skfd = xsocket(AF_INET6, SOCK_DGRAM, 0); + + rt.rtmsg_ifindex = 0; + + if (devname) { + struct ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); + strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name)); + xioctl(skfd, SIOGIFINDEX, &ifr); + rt.rtmsg_ifindex = ifr.ifr_ifindex; + } + + /* Tell the kernel to accept this route. */ + if (action == RTACTION_ADD) + xioctl(skfd, SIOCADDRT, &rt); + else + xioctl(skfd, SIOCDELRT, &rt); + + if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } +#endif -void displayroutes(void) +static const unsigned flagvals[] = { /* Must agree with flagchars[]. */ + RTF_GATEWAY, + RTF_HOST, + RTF_REINSTATE, + RTF_DYNAMIC, + RTF_MODIFIED, +#if ENABLE_FEATURE_IPV6 + RTF_DEFAULT, + RTF_ADDRCONF, + RTF_CACHE +#endif +}; + +#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED) +#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE) + +/* Must agree with flagvals[]. */ +static const char flagchars[] ALIGN1 = + "GHRDM" +#if ENABLE_FEATURE_IPV6 + "DAC" +#endif +; + +static void set_flags(char *flagstr, int flags) { - 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; + int i; - char sdest[16], sgw[16]; + *flagstr++ = 'U'; + for (i = 0; (*flagstr = flagchars[i]) != 0; i++) { + if (flags & flagvals[i]) { + ++flagstr; + } + } +} + +/* also used in netstat */ +void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt) +{ + char devname[64], flags[16], *sdest, *sgw; + unsigned long d, g, m; + int flgs, ref, use, metric, mtu, win, ir; + struct sockaddr_in s_addr; + struct in_addr mask; 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"); + printf("Kernel IP routing table\n" + "Destination Gateway Genmask Flags %s Iface\n", + netstatfmt ? " MSS Window irtt" : "Metric Ref Use"); + + if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */ + goto ERROR; /* Empty or missing line, or read error. */ + } + while (1) { + int r; + r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n", + devname, &d, &g, &flgs, &ref, &use, &metric, &m, + &mtu, &win, &ir); + if (r != 11) { + if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ + break; } - if(nl==1) { - printf("Kernel IP routing table\n" -"Destination Gateway Genmask Flags Metric Ref Use Iface\n"); + ERROR: + bb_error_msg_and_die("fscanf"); + } + + if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */ + continue; + } + + set_flags(flags, (flgs & IPV4_MASK)); +#ifdef RTF_REJECT + if (flgs & RTF_REJECT) { + flags[0] = '!'; + } +#endif + + memset(&s_addr, 0, sizeof(struct sockaddr_in)); + s_addr.sin_family = AF_INET; + s_addr.sin_addr.s_addr = d; + sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */ + s_addr.sin_addr.s_addr = g; + sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */ + mask.s_addr = m; + /* "%15.15s" truncates hostnames, do we really want that? */ + printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags); + free(sdest); + free(sgw); + if (netstatfmt) { + printf("%5d %-5d %6d %s\n", mtu, win, ir, devname); + } else { + printf("%-6d %-2d %7d %s\n", metric, ref, use, devname); + } + } +} + +#if ENABLE_FEATURE_IPV6 + +static void INET6_displayroutes(void) +{ + char addr6[128], *naddr6; + /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses. + * We read the non-delimited strings into the tail of the buffer + * using fscanf and then modify the buffer by shifting forward + * while inserting ':'s and the nul terminator for the first string. + * Hence the strings are at addr6x and addr6x+40. This generates + * _much_ less code than the previous (upstream) approach. */ + char addr6x[80]; + char iface[16], flags[16]; + int iflags, metric, refcnt, use, prefix_len, slen; + struct sockaddr_in6 snaddr6; + + FILE *fp = xfopen("/proc/net/ipv6_route", "r"); + + printf("Kernel IPv6 routing table\n%-44s%-40s" + "Flags Metric Ref Use Iface\n", + "Destination", "Next Hop"); + + while (1) { + int r; + r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n", + addr6x+14, &prefix_len, &slen, addr6x+40+7, + &metric, &use, &refcnt, &iflags, iface); + if (r != 9) { + if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ + break; } + ERROR: + bb_error_msg_and_die("fscanf"); + } + /* Do the addr6x shift-and-insert changes to ':'-delimit addresses. + * For now, always do this to validate the proc route format, even + * if the interface is down. */ + { + int i = 0; + char *p = addr6x+14; + + do { + if (!*p) { + if (i == 40) { /* nul terminator for 1st address? */ + addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */ + ++p; /* Skip and continue. */ + continue; + } + goto ERROR; + } + addr6x[i++] = *p++; + if (!((i+1) % 5)) { + addr6x[i++] = ':'; + } + } while (i < 40+28+7); + } - 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("%-15s %-15s %-15s %-5s %-6d %-2d %7d %s\n", - sdest, sgw, - inet_ntoa(mask), - flags, metric, ref, use, buff); + if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */ + continue; } - nl++; + + set_flags(flags, (iflags & IPV6_MASK)); + + r = 0; + do { + inet_pton(AF_INET6, addr6x + r, + (struct sockaddr *) &snaddr6.sin6_addr); + snaddr6.sin6_family = AF_INET6; + naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6, + 0x0fff /* Apparently, upstream never resolves. */ + ); + + if (!r) { /* 1st pass */ + snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len); + r += 40; + free(naddr6); + } else { /* 2nd pass */ + /* Print the info. */ + printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n", + addr6, naddr6, flags, metric, refcnt, use, iface); + free(naddr6); + break; + } + } while (1); } } -int route_main(int argc, char **argv) +#endif + +#define ROUTE_OPT_A 0x01 +#define ROUTE_OPT_n 0x02 +#define ROUTE_OPT_e 0x04 +#define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */ + +/* 1st byte is offset to next entry offset. 2nd byte is return value. */ +/* 2nd byte matches RTACTION_* code */ +static const char tbl_verb[] ALIGN1 = + "\006\001add\0" + "\006\002del\0" +/* "\011\002delete\0" */ + "\010\002delete" /* Since it's last, we can save a byte. */ +; + +int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int route_main(int argc ATTRIBUTE_UNUSED, char **argv) { - int what = 0; - - argc--; - argv++; - - if (*argv == NULL) { - displayroutes(); - exit(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; + unsigned opt; + int what; + char *family; + char **p; + + /* First, remap '-net' and '-host' to avoid getopt problems. */ + p = argv; + while (*++p) { + if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) { + p[0][0] = '#'; + } + } + + opt = getopt32(argv, "A:ne", &family); + + if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) { +#if ENABLE_FEATURE_IPV6 + if (strcmp(family, "inet6") == 0) { + opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */ + } else +#endif + bb_show_usage(); + } + + argv += optind; + + /* No more args means display the routing table. */ + if (!*argv) { + int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0; +#if ENABLE_FEATURE_IPV6 + if (opt & ROUTE_OPT_INET6) + INET6_displayroutes(); else - show_usage(); +#endif + bb_displayroutes(noresolve, opt & ROUTE_OPT_e); + + fflush_stdout_and_exit(EXIT_SUCCESS); } - return INET_setroute(what, 0, ++argv); + /* Check verb. At the moment, must be add, del, or delete. */ + what = kw_lookup(tbl_verb, &argv); + if (!what || !*argv) { /* Unknown verb or no more args. */ + bb_show_usage(); + } + +#if ENABLE_FEATURE_IPV6 + if (opt & ROUTE_OPT_INET6) + INET6_setroute(what, argv); + else +#endif + INET_setroute(what, argv); + + return EXIT_SUCCESS; }