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freebsd-skq/usr.sbin/ppp/route.c
eugen 7f5b337a61 ppp(8): fix code producing debugging logs 
Fix several cases when long buffer is copied to shorter one
using snprintf that results in contents truncation and
clobbering unsaved errno value and creation of misleading logs.

PR:		218517
Approved by:	avg (mentor)
MFC after:	1 month
2018-02-10 17:09:51 +00:00

939 lines
26 KiB
C
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/un.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/sysctl.h>
#include <termios.h>
#include <unistd.h>
#include "layer.h"
#include "defs.h"
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "iplist.h"
#include "timer.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "fsm.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "slcompress.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "filter.h"
#include "descriptor.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "route.h"
#include "prompt.h"
#include "iface.h"
#include "id.h"
static void
p_sockaddr(struct prompt *prompt, struct sockaddr *phost,
struct sockaddr *pmask, int width)
{
struct ncprange range;
char buf[29];
struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
if (log_IsKept(LogDEBUG)) {
char tmp[50];
log_Printf(LogDEBUG, "Found the following sockaddr:\n");
log_Printf(LogDEBUG, " Family %d, len %d\n",
(int)phost->sa_family, (int)phost->sa_len);
inet_ntop(phost->sa_family, phost->sa_data, tmp, sizeof tmp);
log_Printf(LogDEBUG, " Addr %s\n", tmp);
if (pmask) {
inet_ntop(pmask->sa_family, pmask->sa_data, tmp, sizeof tmp);
log_Printf(LogDEBUG, " Mask %s\n", tmp);
}
}
switch (phost->sa_family) {
case AF_INET:
#ifndef NOINET6
case AF_INET6:
#endif
ncprange_setsa(&range, phost, pmask);
if (ncprange_isdefault(&range))
prompt_Printf(prompt, "%-*s ", width - 1, "default");
else
prompt_Printf(prompt, "%-*s ", width - 1, ncprange_ntoa(&range));
return;
case AF_LINK:
if (dl->sdl_nlen)
snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data);
else if (dl->sdl_alen) {
if (dl->sdl_type == IFT_ETHER) {
if (dl->sdl_alen < sizeof buf / 3) {
int f;
u_char *MAC;
MAC = (u_char *)dl->sdl_data + dl->sdl_nlen;
for (f = 0; f < dl->sdl_alen; f++)
sprintf(buf+f*3, "%02x:", MAC[f]);
buf[f*3-1] = '\0';
} else
strcpy(buf, "??:??:??:??:??:??");
} else
sprintf(buf, "<IFT type %d>", dl->sdl_type);
} else if (dl->sdl_slen)
sprintf(buf, "<slen %d?>", dl->sdl_slen);
else
sprintf(buf, "link#%d", dl->sdl_index);
break;
default:
sprintf(buf, "<AF type %d>", phost->sa_family);
break;
}
prompt_Printf(prompt, "%-*s ", width-1, buf);
}
static struct bits {
u_int32_t b_mask;
char b_val;
} bits[] = {
{ RTF_UP, 'U' },
{ RTF_GATEWAY, 'G' },
{ RTF_HOST, 'H' },
{ RTF_REJECT, 'R' },
{ RTF_DYNAMIC, 'D' },
{ RTF_MODIFIED, 'M' },
{ RTF_DONE, 'd' },
{ RTF_XRESOLVE, 'X' },
{ RTF_STATIC, 'S' },
{ RTF_PROTO1, '1' },
{ RTF_PROTO2, '2' },
{ RTF_BLACKHOLE, 'B' },
#ifdef RTF_LLINFO
{ RTF_LLINFO, 'L' },
#endif
#ifdef RTF_CLONING
{ RTF_CLONING, 'C' },
#endif
#ifdef RTF_PROTO3
{ RTF_PROTO3, '3' },
#endif
#ifdef RTF_BROADCAST
{ RTF_BROADCAST, 'b' },
#endif
{ 0, '\0' }
};
static void
p_flags(struct prompt *prompt, u_int32_t f, unsigned max)
{
char name[33], *flags;
register struct bits *p = bits;
if (max > sizeof name - 1)
max = sizeof name - 1;
for (flags = name; p->b_mask && flags - name < (int)max; p++)
if (p->b_mask & f)
*flags++ = p->b_val;
*flags = '\0';
prompt_Printf(prompt, "%-*.*s", (int)max, (int)max, name);
}
static int route_nifs = -1;
const char *
Index2Nam(int idx)
{
/*
* XXX: Maybe we should select() on the routing socket so that we can
* notice interfaces that come & go (PCCARD support).
* Or we could even support a signal that resets these so that
* the PCCARD insert/remove events can signal ppp.
*/
static char **ifs; /* Figure these out once */
static int debug_done; /* Debug once */
if (idx > route_nifs || (idx > 0 && ifs[idx-1] == NULL)) {
int mib[6], have, had;
size_t needed;
char *buf, *ptr, *end;
struct sockaddr_dl *dl;
struct if_msghdr *ifm;
if (ifs) {
free(ifs);
ifs = NULL;
route_nifs = 0;
}
debug_done = 0;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "Index2Nam: sysctl: estimate: %s\n",
strerror(errno));
return NumStr(idx, NULL, 0);
}
if ((buf = malloc(needed)) == NULL)
return NumStr(idx, NULL, 0);
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
return NumStr(idx, NULL, 0);
}
end = buf + needed;
have = 0;
for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)ptr;
if (ifm->ifm_type != RTM_IFINFO)
continue;
dl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_index > 0) {
if (ifm->ifm_index > have) {
char **newifs;
had = have;
have = ifm->ifm_index + 5;
if (had)
newifs = (char **)realloc(ifs, sizeof(char *) * have);
else
newifs = (char **)malloc(sizeof(char *) * have);
if (!newifs) {
log_Printf(LogDEBUG, "Index2Nam: %s\n", strerror(errno));
route_nifs = 0;
if (ifs) {
free(ifs);
ifs = NULL;
}
free(buf);
return NumStr(idx, NULL, 0);
}
ifs = newifs;
memset(ifs + had, '\0', sizeof(char *) * (have - had));
}
if (ifs[ifm->ifm_index-1] == NULL) {
ifs[ifm->ifm_index-1] = (char *)malloc(dl->sdl_nlen+1);
if (ifs[ifm->ifm_index-1] == NULL)
log_Printf(LogDEBUG, "Skipping interface %d: Out of memory\n",
ifm->ifm_index);
else {
memcpy(ifs[ifm->ifm_index-1], dl->sdl_data, dl->sdl_nlen);
ifs[ifm->ifm_index-1][dl->sdl_nlen] = '\0';
if (route_nifs < ifm->ifm_index)
route_nifs = ifm->ifm_index;
}
}
} else if (log_IsKept(LogDEBUG))
log_Printf(LogDEBUG, "Skipping out-of-range interface %d!\n",
ifm->ifm_index);
}
free(buf);
}
if (log_IsKept(LogDEBUG) && !debug_done) {
int f;
log_Printf(LogDEBUG, "Found the following interfaces:\n");
for (f = 0; f < route_nifs; f++)
if (ifs[f] != NULL)
log_Printf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
debug_done = 1;
}
if (idx < 1 || idx > route_nifs || ifs[idx-1] == NULL)
return NumStr(idx, NULL, 0);
return ifs[idx-1];
}
void
route_ParseHdr(struct rt_msghdr *rtm, struct sockaddr *sa[RTAX_MAX])
{
char *wp;
int rtax;
wp = (char *)(rtm + 1);
for (rtax = 0; rtax < RTAX_MAX; rtax++)
if (rtm->rtm_addrs & (1 << rtax)) {
sa[rtax] = (struct sockaddr *)wp;
wp += ROUNDUP(sa[rtax]->sa_len);
if (sa[rtax]->sa_family == 0)
sa[rtax] = NULL; /* ??? */
} else
sa[rtax] = NULL;
}
int
route_Show(struct cmdargs const *arg)
{
struct rt_msghdr *rtm;
struct sockaddr *sa[RTAX_MAX];
char *sp, *ep, *cp;
size_t needed;
int mib[6];
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_Show: sysctl: estimate: %s\n", strerror(errno));
return (1);
}
sp = malloc(needed);
if (sp == NULL)
return (1);
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_Show: sysctl: getroute: %s\n", strerror(errno));
free(sp);
return (1);
}
ep = sp + needed;
prompt_Printf(arg->prompt, "%-20s%-20sFlags Netif\n",
"Destination", "Gateway");
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
route_ParseHdr(rtm, sa);
if (sa[RTAX_DST] && sa[RTAX_GATEWAY]) {
p_sockaddr(arg->prompt, sa[RTAX_DST], sa[RTAX_NETMASK], 20);
p_sockaddr(arg->prompt, sa[RTAX_GATEWAY], NULL, 20);
p_flags(arg->prompt, rtm->rtm_flags, 6);
prompt_Printf(arg->prompt, " %s\n", Index2Nam(rtm->rtm_index));
} else
prompt_Printf(arg->prompt, "<can't parse routing entry>\n");
}
free(sp);
return 0;
}
/*
* Delete routes associated with our interface
*/
void
route_IfDelete(struct bundle *bundle, int all)
{
struct rt_msghdr *rtm;
struct sockaddr *sa[RTAX_MAX];
struct ncprange range;
int pass;
size_t needed;
char *sp, *cp, *ep;
int mib[6];
log_Printf(LogDEBUG, "route_IfDelete (%d)\n", bundle->iface->index);
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: estimate: %s\n",
strerror(errno));
return;
}
sp = malloc(needed);
if (sp == NULL)
return;
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: getroute: %s\n",
strerror(errno));
free(sp);
return;
}
ep = sp + needed;
for (pass = 0; pass < 2; pass++) {
/*
* We do 2 passes. The first deletes all cloned routes. The second
* deletes all non-cloned routes. This is done to avoid
* potential errors from trying to delete route X after route Y where
* route X was cloned from route Y (and is no longer there 'cos it
* may have gone with route Y).
*/
if (pass == 0)
/* So we can't tell ! */
continue;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
route_ParseHdr(rtm, sa);
if (rtm->rtm_index == bundle->iface->index &&
sa[RTAX_DST] && sa[RTAX_GATEWAY] &&
(sa[RTAX_DST]->sa_family == AF_INET
#ifndef NOINET6
|| sa[RTAX_DST]->sa_family == AF_INET6
#endif
) &&
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
if (log_IsKept(LogDEBUG)) {
char gwstr[NCP_ASCIIBUFFERSIZE];
struct ncpaddr gw;
ncprange_setsa(&range, sa[RTAX_DST], sa[RTAX_NETMASK]);
ncpaddr_setsa(&gw, sa[RTAX_GATEWAY]);
snprintf(gwstr, sizeof gwstr, "%s", ncpaddr_ntoa(&gw));
log_Printf(LogDEBUG, "Found %s %s\n", ncprange_ntoa(&range), gwstr);
}
if (sa[RTAX_GATEWAY]->sa_family == AF_INET ||
#ifndef NOINET6
sa[RTAX_GATEWAY]->sa_family == AF_INET6 ||
#endif
sa[RTAX_GATEWAY]->sa_family == AF_LINK) {
if (pass == 1) {
ncprange_setsa(&range, sa[RTAX_DST], sa[RTAX_NETMASK]);
rt_Set(bundle, RTM_DELETE, &range, NULL, 0, 0);
} else
log_Printf(LogDEBUG, "route_IfDelete: Skip it (pass %d)\n", pass);
} else
log_Printf(LogDEBUG,
"route_IfDelete: Can't remove routes for family %d\n",
sa[RTAX_GATEWAY]->sa_family);
}
}
}
free(sp);
}
/*
* Update the MTU on all routes for the given interface
*/
void
route_UpdateMTU(struct bundle *bundle)
{
struct rt_msghdr *rtm;
struct sockaddr *sa[RTAX_MAX];
struct ncprange dst;
size_t needed;
char *sp, *cp, *ep;
int mib[6];
log_Printf(LogDEBUG, "route_UpdateMTU (%d)\n", bundle->iface->index);
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_DUMP;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: estimate: %s\n",
strerror(errno));
return;
}
sp = malloc(needed);
if (sp == NULL)
return;
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
log_Printf(LogERROR, "route_IfDelete: sysctl: getroute: %s\n",
strerror(errno));
free(sp);
return;
}
ep = sp + needed;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
route_ParseHdr(rtm, sa);
if (sa[RTAX_DST] && (sa[RTAX_DST]->sa_family == AF_INET
#ifndef NOINET6
|| sa[RTAX_DST]->sa_family == AF_INET6
#endif
) &&
sa[RTAX_GATEWAY] && rtm->rtm_index == bundle->iface->index) {
if (log_IsKept(LogTCPIP)) {
ncprange_setsa(&dst, sa[RTAX_DST], sa[RTAX_NETMASK]);
log_Printf(LogTCPIP, "route_UpdateMTU: Netif: %d (%s), dst %s,"
" mtu %lu\n", rtm->rtm_index, Index2Nam(rtm->rtm_index),
ncprange_ntoa(&dst), bundle->iface->mtu);
}
rt_Update(bundle, sa[RTAX_DST], sa[RTAX_GATEWAY], sa[RTAX_NETMASK],
sa[RTAX_IFP], sa[RTAX_IFA]);
}
}
free(sp);
}
int
GetIfIndex(char *name)
{
int idx;
idx = 1;
while (route_nifs == -1 || idx < route_nifs)
if (strcmp(Index2Nam(idx), name) == 0)
return idx;
else
idx++;
return -1;
}
void
route_Change(struct bundle *bundle, struct sticky_route *r,
const struct ncpaddr *me, const struct ncpaddr *peer)
{
struct ncpaddr dst;
for (; r; r = r->next) {
ncprange_getaddr(&r->dst, &dst);
if (ncpaddr_family(me) == AF_INET) {
if ((r->type & ROUTE_DSTMYADDR) && !ncpaddr_equal(&dst, me)) {
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
ncprange_sethost(&r->dst, me);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_DSTHISADDR) && !ncpaddr_equal(&dst, peer)) {
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
ncprange_sethost(&r->dst, peer);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_DSTDNS0) && !ncpaddr_equal(&dst, peer)) {
if (bundle->ncp.ipcp.ns.dns[0].s_addr == INADDR_NONE)
continue;
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_DSTDNS1) && !ncpaddr_equal(&dst, peer)) {
if (bundle->ncp.ipcp.ns.dns[1].s_addr == INADDR_NONE)
continue;
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_GWHISADDR) && !ncpaddr_equal(&r->gw, peer))
ncpaddr_copy(&r->gw, peer);
#ifndef NOINET6
} else if (ncpaddr_family(me) == AF_INET6) {
if ((r->type & ROUTE_DSTMYADDR6) && !ncpaddr_equal(&dst, me)) {
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
ncprange_sethost(&r->dst, me);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_DSTHISADDR6) && !ncpaddr_equal(&dst, peer)) {
rt_Set(bundle, RTM_DELETE, &r->dst, NULL, 1, 0);
ncprange_sethost(&r->dst, peer);
if (r->type & ROUTE_GWHISADDR)
ncpaddr_copy(&r->gw, peer);
} else if ((r->type & ROUTE_GWHISADDR6) && !ncpaddr_equal(&r->gw, peer))
ncpaddr_copy(&r->gw, peer);
#endif
}
rt_Set(bundle, RTM_ADD, &r->dst, &r->gw, 1, 0);
}
}
void
route_Add(struct sticky_route **rp, int type, const struct ncprange *dst,
const struct ncpaddr *gw)
{
struct sticky_route *r;
int dsttype = type & ROUTE_DSTANY;
r = NULL;
while (*rp) {
if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
(!dsttype && ncprange_equal(&(*rp)->dst, dst))) {
/* Oops, we already have this route - unlink it */
free(r); /* impossible really */
r = *rp;
*rp = r->next;
} else
rp = &(*rp)->next;
}
if (r == NULL) {
r = (struct sticky_route *)malloc(sizeof(struct sticky_route));
if (r == NULL) {
log_Printf(LogERROR, "route_Add: Out of memory!\n");
return;
}
}
r->type = type;
r->next = NULL;
ncprange_copy(&r->dst, dst);
ncpaddr_copy(&r->gw, gw);
*rp = r;
}
void
route_Delete(struct sticky_route **rp, int type, const struct ncprange *dst)
{
struct sticky_route *r;
int dsttype = type & ROUTE_DSTANY;
for (; *rp; rp = &(*rp)->next) {
if ((dsttype && dsttype == ((*rp)->type & ROUTE_DSTANY)) ||
(!dsttype && ncprange_equal(dst, &(*rp)->dst))) {
r = *rp;
*rp = r->next;
free(r);
break;
}
}
}
void
route_DeleteAll(struct sticky_route **rp)
{
struct sticky_route *r, *rn;
for (r = *rp; r; r = rn) {
rn = r->next;
free(r);
}
*rp = NULL;
}
void
route_ShowSticky(struct prompt *p, struct sticky_route *r, const char *tag,
int indent)
{
int tlen = strlen(tag);
if (tlen + 2 > indent)
prompt_Printf(p, "%s:\n%*s", tag, indent, "");
else
prompt_Printf(p, "%s:%*s", tag, indent - tlen - 1, "");
for (; r; r = r->next) {
prompt_Printf(p, "%*sadd ", tlen ? 0 : indent, "");
tlen = 0;
if (r->type & ROUTE_DSTMYADDR)
prompt_Printf(p, "MYADDR");
else if (r->type & ROUTE_DSTMYADDR6)
prompt_Printf(p, "MYADDR6");
else if (r->type & ROUTE_DSTHISADDR)
prompt_Printf(p, "HISADDR");
else if (r->type & ROUTE_DSTHISADDR6)
prompt_Printf(p, "HISADDR6");
else if (r->type & ROUTE_DSTDNS0)
prompt_Printf(p, "DNS0");
else if (r->type & ROUTE_DSTDNS1)
prompt_Printf(p, "DNS1");
else if (ncprange_isdefault(&r->dst))
prompt_Printf(p, "default");
else
prompt_Printf(p, "%s", ncprange_ntoa(&r->dst));
if (r->type & ROUTE_GWHISADDR)
prompt_Printf(p, " HISADDR\n");
else if (r->type & ROUTE_GWHISADDR6)
prompt_Printf(p, " HISADDR6\n");
else
prompt_Printf(p, " %s\n", ncpaddr_ntoa(&r->gw));
}
}
struct rtmsg {
struct rt_msghdr m_rtm;
char m_space[256];
};
static size_t
memcpy_roundup(char *cp, const void *data, size_t len)
{
size_t padlen;
padlen = ROUNDUP(len);
memcpy(cp, data, len);
if (padlen > len)
memset(cp + len, '\0', padlen - len);
return padlen;
}
#if defined(__KAME__) && !defined(NOINET6)
static void
add_scope(struct sockaddr *sa, int ifindex)
{
struct sockaddr_in6 *sa6;
if (sa->sa_family != AF_INET6)
return;
sa6 = (struct sockaddr_in6 *)sa;
if (!IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr) &&
!IN6_IS_ADDR_MC_LINKLOCAL(&sa6->sin6_addr))
return;
if (*(u_int16_t *)&sa6->sin6_addr.s6_addr[2] != 0)
return;
*(u_int16_t *)&sa6->sin6_addr.s6_addr[2] = htons(ifindex);
}
#endif
int
rt_Set(struct bundle *bundle, int cmd, const struct ncprange *dst,
const struct ncpaddr *gw, int bang, int quiet)
{
struct rtmsg rtmes;
int s, nb, wb;
char *cp;
const char *cmdstr;
struct sockaddr_storage sadst, samask, sagw;
int result = 1;
if (bang)
cmdstr = (cmd == RTM_ADD ? "Add!" : "Delete!");
else
cmdstr = (cmd == RTM_ADD ? "Add" : "Delete");
s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0) {
log_Printf(LogERROR, "rt_Set: socket(): %s\n", strerror(errno));
return result;
}
memset(&rtmes, '\0', sizeof rtmes);
rtmes.m_rtm.rtm_version = RTM_VERSION;
rtmes.m_rtm.rtm_type = cmd;
rtmes.m_rtm.rtm_addrs = RTA_DST;
rtmes.m_rtm.rtm_seq = ++bundle->routing_seq;
rtmes.m_rtm.rtm_pid = getpid();
rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
if (cmd == RTM_ADD) {
if (bundle->ncp.cfg.sendpipe > 0) {
rtmes.m_rtm.rtm_rmx.rmx_sendpipe = bundle->ncp.cfg.sendpipe;
rtmes.m_rtm.rtm_inits |= RTV_SPIPE;
}
if (bundle->ncp.cfg.recvpipe > 0) {
rtmes.m_rtm.rtm_rmx.rmx_recvpipe = bundle->ncp.cfg.recvpipe;
rtmes.m_rtm.rtm_inits |= RTV_RPIPE;
}
}
ncprange_getsa(dst, &sadst, &samask);
#if defined(__KAME__) && !defined(NOINET6)
add_scope((struct sockaddr *)&sadst, bundle->iface->index);
#endif
cp = rtmes.m_space;
cp += memcpy_roundup(cp, &sadst, sadst.ss_len);
if (cmd == RTM_ADD) {
if (gw == NULL) {
log_Printf(LogERROR, "rt_Set: Program error\n");
close(s);
return result;
}
ncpaddr_getsa(gw, &sagw);
#if defined(__KAME__) && !defined(NOINET6)
add_scope((struct sockaddr *)&sagw, bundle->iface->index);
#endif
if (ncpaddr_isdefault(gw)) {
if (!quiet)
log_Printf(LogERROR, "rt_Set: Cannot add a route with"
" gateway 0.0.0.0\n");
close(s);
return result;
} else {
cp += memcpy_roundup(cp, &sagw, sagw.ss_len);
rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
}
}
if (!ncprange_ishost(dst)) {
cp += memcpy_roundup(cp, &samask, samask.ss_len);
rtmes.m_rtm.rtm_addrs |= RTA_NETMASK;
} else
rtmes.m_rtm.rtm_flags |= RTF_HOST;
nb = cp - (char *)&rtmes;
rtmes.m_rtm.rtm_msglen = nb;
wb = ID0write(s, &rtmes, nb);
if (wb < 0) {
log_Printf(LogTCPIP, "rt_Set failure:\n");
log_Printf(LogTCPIP, "rt_Set: Cmd = %s\n", cmdstr);
log_Printf(LogTCPIP, "rt_Set: Dst = %s\n", ncprange_ntoa(dst));
if (gw != NULL)
log_Printf(LogTCPIP, "rt_Set: Gateway = %s\n", ncpaddr_ntoa(gw));
failed:
if (cmd == RTM_ADD && (rtmes.m_rtm.rtm_errno == EEXIST ||
(rtmes.m_rtm.rtm_errno == 0 && errno == EEXIST))) {
if (!bang) {
log_Printf(LogWARN, "Add route failed: %s already exists\n",
ncprange_ntoa(dst));
result = 0; /* Don't add to our dynamic list */
} else {
rtmes.m_rtm.rtm_type = cmd = RTM_CHANGE;
if ((wb = ID0write(s, &rtmes, nb)) < 0)
goto failed;
}
} else if (cmd == RTM_DELETE &&
(rtmes.m_rtm.rtm_errno == ESRCH ||
(rtmes.m_rtm.rtm_errno == 0 && errno == ESRCH))) {
if (!bang)
log_Printf(LogWARN, "Del route failed: %s: Non-existent\n",
ncprange_ntoa(dst));
} else if (rtmes.m_rtm.rtm_errno == 0) {
if (!quiet || errno != ENETUNREACH)
log_Printf(LogWARN, "%s route failed: %s: errno: %s\n", cmdstr,
ncprange_ntoa(dst), strerror(errno));
} else
log_Printf(LogWARN, "%s route failed: %s: %s\n",
cmdstr, ncprange_ntoa(dst), strerror(rtmes.m_rtm.rtm_errno));
}
if (log_IsKept(LogDEBUG)) {
char gwstr[NCP_ASCIIBUFFERSIZE];
if (gw)
snprintf(gwstr, sizeof gwstr, "%s", ncpaddr_ntoa(gw));
else
snprintf(gwstr, sizeof gwstr, "<none>");
log_Printf(LogDEBUG, "wrote %d: cmd = %s, dst = %s, gateway = %s\n",
wb, cmdstr, ncprange_ntoa(dst), gwstr);
}
close(s);
return result;
}
void
rt_Update(struct bundle *bundle, const struct sockaddr *dst,
const struct sockaddr *gw, const struct sockaddr *mask,
const struct sockaddr *ifp, const struct sockaddr *ifa)
{
struct ncprange ncpdst;
struct rtmsg rtmes;
char *p;
int s, wb;
s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0) {
log_Printf(LogERROR, "rt_Update: socket(): %s\n", strerror(errno));
return;
}
memset(&rtmes, '\0', sizeof rtmes);
rtmes.m_rtm.rtm_version = RTM_VERSION;
rtmes.m_rtm.rtm_type = RTM_CHANGE;
rtmes.m_rtm.rtm_addrs = 0;
rtmes.m_rtm.rtm_seq = ++bundle->routing_seq;
rtmes.m_rtm.rtm_pid = getpid();
rtmes.m_rtm.rtm_flags = RTF_UP | RTF_STATIC;
if (bundle->ncp.cfg.sendpipe > 0) {
rtmes.m_rtm.rtm_rmx.rmx_sendpipe = bundle->ncp.cfg.sendpipe;
rtmes.m_rtm.rtm_inits |= RTV_SPIPE;
}
if (bundle->ncp.cfg.recvpipe > 0) {
rtmes.m_rtm.rtm_rmx.rmx_recvpipe = bundle->ncp.cfg.recvpipe;
rtmes.m_rtm.rtm_inits |= RTV_RPIPE;
}
rtmes.m_rtm.rtm_rmx.rmx_mtu = bundle->iface->mtu;
rtmes.m_rtm.rtm_inits |= RTV_MTU;
p = rtmes.m_space;
if (dst) {
rtmes.m_rtm.rtm_addrs |= RTA_DST;
p += memcpy_roundup(p, dst, dst->sa_len);
}
if (gw) {
rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
p += memcpy_roundup(p, gw, gw->sa_len);
}
if (mask) {
rtmes.m_rtm.rtm_addrs |= RTA_NETMASK;
p += memcpy_roundup(p, mask, mask->sa_len);
} else
rtmes.m_rtm.rtm_flags |= RTF_HOST;
if (ifa && ifp && ifp->sa_family == AF_LINK) {
rtmes.m_rtm.rtm_addrs |= RTA_IFP;
p += memcpy_roundup(p, ifp, ifp->sa_len);
rtmes.m_rtm.rtm_addrs |= RTA_IFA;
p += memcpy_roundup(p, ifa, ifa->sa_len);
}
rtmes.m_rtm.rtm_msglen = p - (char *)&rtmes;
wb = ID0write(s, &rtmes, rtmes.m_rtm.rtm_msglen);
if (wb < 0) {
ncprange_setsa(&ncpdst, dst, mask);
log_Printf(LogTCPIP, "rt_Update failure:\n");
log_Printf(LogTCPIP, "rt_Update: Dst = %s\n", ncprange_ntoa(&ncpdst));
if (rtmes.m_rtm.rtm_errno == 0)
log_Printf(LogWARN, "%s: Change route failed: errno: %s\n",
ncprange_ntoa(&ncpdst), strerror(errno));
else
log_Printf(LogWARN, "%s: Change route failed: %s\n",
ncprange_ntoa(&ncpdst), strerror(rtmes.m_rtm.rtm_errno));
}
close(s);
}
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