mirror of
https://github.com/sheumann/hush.git
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698 lines
17 KiB
C
698 lines
17 KiB
C
/* vi: set sw=4 ts=4: */
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/* 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 and AF_INET6
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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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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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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* IPV6 support added by Bart Visscher <magick@linux-fan.com>
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*/
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/* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Rewritten to fix several bugs, add additional error checking, and
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* remove ridiculous amounts of bloat.
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*/
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#include "busybox.h"
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#include "inet_common.h"
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#include <getopt.h>
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#include <net/route.h>
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#include <net/if.h>
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#ifndef RTF_UP
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/* Keep this in sync with /usr/src/linux/include/linux/route.h */
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#define RTF_UP 0x0001 /* route usable */
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#define RTF_GATEWAY 0x0002 /* destination is a gateway */
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#define RTF_HOST 0x0004 /* host entry (net otherwise) */
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#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
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#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
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#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
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#define RTF_MTU 0x0040 /* specific MTU for this route */
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#ifndef RTF_MSS
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#define RTF_MSS RTF_MTU /* Compatibility :-( */
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#endif
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#define RTF_WINDOW 0x0080 /* per route window clamping */
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#define RTF_IRTT 0x0100 /* Initial round trip time */
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#define RTF_REJECT 0x0200 /* Reject route */
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#endif
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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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#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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/* The RTACTION entries must agree with tbl_verb[] below! */
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#define RTACTION_ADD 1
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#define RTACTION_DEL 2
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/* For the various tbl_*[] arrays, the 1st byte is the offset to
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* the next entry and the 2nd byte is return value. */
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#define NET_FLAG 1
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#define HOST_FLAG 2
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/* We remap '-' to '#' to avoid problems with getopt. */
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static const char tbl_hash_net_host[] =
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"\007\001#net\0"
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/* "\010\002#host\0" */
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"\007\002#host" /* Since last, we can save a byte. */
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;
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#define KW_TAKES_ARG 020
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#define KW_SETS_FLAG 040
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#define KW_IPVx_METRIC 020
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#define KW_IPVx_NETMASK 021
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#define KW_IPVx_GATEWAY 022
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#define KW_IPVx_MSS 023
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#define KW_IPVx_WINDOW 024
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#define KW_IPVx_IRTT 025
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#define KW_IPVx_DEVICE 026
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#define KW_IPVx_FLAG_ONLY 040
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#define KW_IPVx_REJECT 040
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#define KW_IPVx_MOD 041
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#define KW_IPVx_DYN 042
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#define KW_IPVx_REINSTATE 043
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static const char tbl_ipvx[] =
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/* 020 is the "takes an arg" bit */
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#if HAVE_NEW_ADDRT
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"\011\020metric\0"
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#endif
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"\012\021netmask\0"
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"\005\022gw\0"
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"\012\022gateway\0"
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"\006\023mss\0"
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"\011\024window\0"
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#ifdef RTF_IRTT
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"\007\025irtt\0"
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#endif
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"\006\026dev\0"
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"\011\026device\0"
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/* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
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#ifdef RTF_REJECT
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"\011\040reject\0"
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#endif
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"\006\041mod\0"
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"\006\042dyn\0"
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/* "\014\043reinstate\0" */
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"\013\043reinstate" /* Since last, we can save a byte. */
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;
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static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
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#ifdef RTF_REJECT
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RTF_REJECT,
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#endif
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RTF_MODIFIED,
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RTF_DYNAMIC,
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RTF_REINSTATE
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};
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static int kw_lookup(const char *kwtbl, char ***pargs)
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{
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if (**pargs) {
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do {
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if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */
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*pargs += 1;
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if (kwtbl[1] & KW_TAKES_ARG) {
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if (!**pargs) { /* No more args! */
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bb_show_usage();
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}
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*pargs += 1; /* Calling routine will use args[-1]. */
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}
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return kwtbl[1];
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}
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kwtbl += *kwtbl;
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} while (*kwtbl);
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}
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return 0;
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}
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/* Add or delete a route, depending on action. */
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static void INET_setroute(int action, char **args)
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{
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struct rtentry rt;
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const char *netmask = NULL;
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int skfd, isnet, xflag;
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/* Grab the -net or -host options. Remember they were transformed. */
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xflag = kw_lookup(tbl_hash_net_host, &args);
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/* If we did grab -net or -host, make sure we still have an arg left. */
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if (*args == NULL) {
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bb_show_usage();
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}
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/* Clean out the RTREQ structure. */
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memset(&rt, 0, sizeof(rt));
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{
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const char *target = *args++;
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char *prefix;
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/* recognize x.x.x.x/mask format. */
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prefix = strchr(target, '/');
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if(prefix) {
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int prefix_len;
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prefix_len = xatoul_range(prefix+1, 0, 32);
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mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len));
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*prefix = '\0';
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#if HAVE_NEW_ADDRT
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rt.rt_genmask.sa_family = AF_INET;
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#endif
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} else {
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/* Default netmask. */
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netmask = bb_str_default;
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}
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/* Prefer hostname lookup is -host flag (xflag==1) was given. */
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isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
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(xflag & HOST_FLAG));
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if (isnet < 0) {
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bb_error_msg_and_die("resolving %s", target);
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}
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if(prefix) {
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/* do not destroy prefix for process args */
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*prefix = '/';
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}
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}
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if (xflag) { /* Reinit isnet if -net or -host was specified. */
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isnet = (xflag & NET_FLAG);
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}
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/* Fill in the other fields. */
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rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
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while (*args) {
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int k = kw_lookup(tbl_ipvx, &args);
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const char *args_m1 = args[-1];
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if (k & KW_IPVx_FLAG_ONLY) {
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rt.rt_flags |= flags_ipvx[k & 3];
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continue;
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}
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#if HAVE_NEW_ADDRT
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if (k == KW_IPVx_METRIC) {
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rt.rt_metric = xatoul(args_m1) + 1;
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continue;
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}
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#endif
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if (k == KW_IPVx_NETMASK) {
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struct sockaddr mask;
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if (mask_in_addr(rt)) {
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bb_show_usage();
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}
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netmask = args_m1;
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isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
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if (isnet < 0) {
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bb_error_msg_and_die("resolving %s", netmask);
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}
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rt.rt_genmask = full_mask(mask);
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continue;
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}
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if (k == KW_IPVx_GATEWAY) {
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if (rt.rt_flags & RTF_GATEWAY) {
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bb_show_usage();
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}
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isnet = INET_resolve(args_m1,
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(struct sockaddr_in *) &rt.rt_gateway, 1);
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rt.rt_flags |= RTF_GATEWAY;
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if (isnet) {
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if (isnet < 0) {
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bb_error_msg_and_die("resolving %s", args_m1);
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}
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bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
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}
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continue;
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}
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if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
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rt.rt_flags |= RTF_MSS;
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rt.rt_mss = xatoul_range(args_m1, 64, 32768);
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continue;
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}
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if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */
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rt.rt_flags |= RTF_WINDOW;
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rt.rt_window = xatoul_range(args_m1, 128, INT_MAX);
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continue;
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}
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#ifdef RTF_IRTT
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if (k == KW_IPVx_IRTT) {
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rt.rt_flags |= RTF_IRTT;
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rt.rt_irtt = xatoul(args_m1);
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rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 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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bb_error_msg_and_die("bad irtt");
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}
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#endif
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continue;
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}
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#endif
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/* Device is special in that it can be the last arg specified
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* and doesn't requre the dev/device keyword in that case. */
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if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
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/* Don't use args_m1 here since args may have changed! */
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rt.rt_dev = args[-1];
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continue;
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}
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/* Nothing matched. */
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bb_show_usage();
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}
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#ifdef RTF_REJECT
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if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) {
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rt.rt_dev = (char*)"lo";
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}
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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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bb_error_msg_and_die("netmask %.8x and host route conflict",
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(unsigned int) mask);
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}
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if (mask & (mask + 1)) {
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bb_error_msg_and_die("bogus netmask %s", netmask);
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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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bb_error_msg_and_die("netmask and route address conflict");
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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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}
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/* Create a socket to the INET kernel. */
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skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) {
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bb_perror_msg_and_die("SIOC[ADD|DEL]RT");
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}
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if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
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}
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#if ENABLE_FEATURE_IPV6
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static void INET6_setroute(int action, char **args)
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{
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struct sockaddr_in6 sa6;
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struct in6_rtmsg rt;
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int prefix_len, skfd;
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const char *devname;
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/* We know args isn't NULL from the check in route_main. */
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const char *target = *args++;
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if (strcmp(target, bb_str_default) == 0) {
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prefix_len = 0;
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memset(&sa6, 0, sizeof(sa6));
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} else {
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char *cp;
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if ((cp = strchr(target, '/'))) { /* Yes... const to non is ok. */
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*cp = 0;
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prefix_len = xatoul_range(cp+1, 0, 128);
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} else {
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prefix_len = 128;
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}
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if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
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bb_error_msg_and_die("resolving %s", target);
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}
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}
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/* Clean out the RTREQ structure. */
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memset(&rt, 0, sizeof(rt));
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memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
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/* Fill in the other fields. */
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rt.rtmsg_dst_len = prefix_len;
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rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
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rt.rtmsg_metric = 1;
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devname = NULL;
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while (*args) {
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int k = kw_lookup(tbl_ipvx, &args);
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const char *args_m1 = args[-1];
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if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
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rt.rtmsg_flags |= flags_ipvx[k & 3];
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continue;
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}
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if (k == KW_IPVx_METRIC) {
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rt.rtmsg_metric = xatoul(args_m1);
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continue;
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}
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if (k == KW_IPVx_GATEWAY) {
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if (rt.rtmsg_flags & RTF_GATEWAY) {
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bb_show_usage();
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}
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if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
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bb_error_msg_and_die("resolving %s", args_m1);
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}
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memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
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sizeof(struct in6_addr));
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rt.rtmsg_flags |= RTF_GATEWAY;
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continue;
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}
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/* Device is special in that it can be the last arg specified
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* and doesn't requre the dev/device keyword in that case. */
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if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
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/* Don't use args_m1 here since args may have changed! */
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devname = args[-1];
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continue;
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}
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/* Nothing matched. */
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bb_show_usage();
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}
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/* Create a socket to the INET6 kernel. */
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skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
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rt.rtmsg_ifindex = 0;
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if (devname) {
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name));
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if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) {
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bb_perror_msg_and_die("SIOGIFINDEX");
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}
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rt.rtmsg_ifindex = ifr.ifr_ifindex;
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}
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/* Tell the kernel to accept this route. */
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if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) {
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bb_perror_msg_and_die("SIOC[ADD|DEL]RT");
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}
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if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
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}
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#endif
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static const unsigned int flagvals[] = { /* Must agree with flagchars[]. */
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RTF_GATEWAY,
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RTF_HOST,
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RTF_REINSTATE,
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RTF_DYNAMIC,
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RTF_MODIFIED,
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#if ENABLE_FEATURE_IPV6
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RTF_DEFAULT,
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RTF_ADDRCONF,
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RTF_CACHE
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#endif
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};
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#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
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#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
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static const char flagchars[] = /* Must agree with flagvals[]. */
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"GHRDM"
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#if ENABLE_FEATURE_IPV6
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"DAC"
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#endif
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;
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static void set_flags(char *flagstr, int flags)
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{
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int i;
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*flagstr++ = 'U';
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for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
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if (flags & flagvals[i]) {
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++flagstr;
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}
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}
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}
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/* also used in netstat */
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void bb_displayroutes(int noresolve, int netstatfmt)
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{
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char devname[64], flags[16], sdest[16], sgw[16];
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unsigned long int d, g, m;
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int flgs, ref, use, metric, mtu, win, ir;
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struct sockaddr_in s_addr;
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struct in_addr mask;
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FILE *fp = xfopen("/proc/net/route", "r");
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printf("Kernel IP routing table\n"
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"Destination Gateway Genmask Flags %s Iface\n",
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netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
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if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
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goto ERROR; /* Empty or missing line, or read error. */
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}
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while (1) {
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int r;
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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;
|
|
}
|
|
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;
|
|
INET_rresolve(sdest, sizeof(sdest), &s_addr,
|
|
(noresolve | 0x8000), m); /* Default instead of *. */
|
|
|
|
s_addr.sin_addr.s_addr = g;
|
|
INET_rresolve(sgw, sizeof(sgw), &s_addr,
|
|
(noresolve | 0x4000), m); /* Host instead of net. */
|
|
|
|
mask.s_addr = m;
|
|
printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
|
|
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(int noresolve)
|
|
{
|
|
char addr6[128], naddr6[128];
|
|
/* 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);
|
|
}
|
|
|
|
if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
|
|
continue;
|
|
}
|
|
|
|
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;
|
|
INET6_rresolve(naddr6, sizeof(naddr6),
|
|
(struct sockaddr_in6 *) &snaddr6,
|
|
0x0fff /* Apparently, upstream never resolves. */
|
|
);
|
|
|
|
if (!r) { /* 1st pass */
|
|
snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
|
|
r += 40;
|
|
} else { /* 2nd pass */
|
|
/* Print the info. */
|
|
printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
|
|
addr6, naddr6, flags, metric, refcnt, use, iface);
|
|
break;
|
|
}
|
|
} while (1);
|
|
}
|
|
}
|
|
|
|
#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. */
|
|
static const char tbl_verb[] = /* 2nd byte matches RTACTION_* code */
|
|
"\006\001add\0"
|
|
"\006\002del\0"
|
|
/* "\011\002delete\0" */
|
|
"\010\002delete" /* Since last, we can save a byte. */
|
|
;
|
|
|
|
int route_main(int argc, char **argv);
|
|
int route_main(int argc, char **argv)
|
|
{
|
|
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(argc, 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(noresolve);
|
|
else
|
|
#endif
|
|
bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
|
|
|
|
fflush_stdout_and_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/* 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;
|
|
}
|