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freebsd/usr.sbin/ppp/route.c

400 lines
8.7 KiB
C

/*
* PPP Routing related Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the Internet Initiative Japan, Inc. The name of the
* IIJ may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $Id: route.c,v 1.4 1995/07/08 06:08:52 amurai Exp $
*
*/
#include <sys/types.h>
#include <machine/endian.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <net/route.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <errno.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#if (BSD >= 199306)
#include <sys/sysctl.h>
#else
#include <sys/kinfo.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
static int IfIndex;
struct rtmsg {
struct rt_msghdr m_rtm;
char m_space[64];
};
static int seqno;
void
OsSetRoute(cmd, dst, gateway, mask)
int cmd;
struct in_addr dst;
struct in_addr gateway;
struct in_addr mask;
{
struct rtmsg rtmes;
int s, nb, wb;
char *cp;
u_long *lp;
struct sockaddr_in rtdata;
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0)
logprintf("socket\n");
bzero(&rtmes, sizeof(rtmes));
rtmes.m_rtm.rtm_version = RTM_VERSION;
rtmes.m_rtm.rtm_type = cmd;
rtmes.m_rtm.rtm_addrs = RTA_DST | RTA_NETMASK;
if (cmd == RTM_ADD) rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
rtmes.m_rtm.rtm_seq = ++seqno;
rtmes.m_rtm.rtm_pid = getpid();
rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY;
bzero(&rtdata, sizeof(rtdata));
rtdata.sin_len = 16;
rtdata.sin_family = AF_INET;
rtdata.sin_port = 0;
rtdata.sin_addr = dst;
cp = rtmes.m_space;
bcopy(&rtdata, cp, 16);
cp += 16;
if (gateway.s_addr) {
rtdata.sin_addr = gateway;
bcopy(&rtdata, cp, 16);
cp += 16;
}
if (dst.s_addr == INADDR_ANY)
mask.s_addr = INADDR_ANY;
lp = (u_long *)cp;
if (mask.s_addr) {
*lp++ = 8;
cp += sizeof(int);
*lp = mask.s_addr;
} else
*lp = 0;
cp += sizeof(u_long);
nb = cp - (char *)&rtmes;
rtmes.m_rtm.rtm_msglen = nb;
wb = write(s, &rtmes, nb);
if (wb < 0) {
LogPrintf(LOG_TCPIP, "Already set route addr dst=%x, gateway=%x\n"
,dst.s_addr, gateway.s_addr);
}
#ifdef DEBUG
logprintf("wrote %d: dst = %x, gateway = %x\n", nb, dst.s_addr, gateway.s_addr);
#endif
close(s);
}
static void
p_sockaddr(sa, width)
struct sockaddr *sa;
int width;
{
register char *cp;
register struct sockaddr_in *sin = (struct sockaddr_in *)sa;
cp = (sin->sin_addr.s_addr == 0) ? "default" :
inet_ntoa(sin->sin_addr);
printf("%-*.*s ", width, width, cp);
}
struct bits {
short b_mask;
char b_val;
} bits[] = {
{ RTF_UP, 'U' },
{ RTF_GATEWAY, 'G' },
{ RTF_HOST, 'H' },
{ RTF_DYNAMIC, 'D' },
{ RTF_MODIFIED, 'M' },
{ RTF_CLONING, 'C' },
{ RTF_XRESOLVE, 'X' },
{ RTF_LLINFO, 'L' },
{ RTF_REJECT, 'R' },
{ 0 }
};
static void
p_flags(f, format)
register int f;
char *format;
{
char name[33], *flags;
register struct bits *p = bits;
for (flags = name; p->b_mask; p++)
if (p->b_mask & f)
*flags++ = p->b_val;
*flags = '\0';
printf(format, name);
}
int
ShowRoute()
{
struct rt_msghdr *rtm;
struct sockaddr *sa;
char *sp, *ep, *cp;
u_char *wp;
int *lp;
int needed, nb;
u_long mask;
#if (BSD >= 199306)
int mib[6];
#endif
#if (BSD >= 199306)
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) {
perror("sysctl-estimate");
return(1);
}
#else
needed = getkerninfo(KINFO_RT_DUMP, 0, 0, 0);
#endif
if (needed < 0)
return(1);
sp = malloc(needed);
if (sp == NULL)
return(1);
#if (BSD >= 199306)
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
perror("sysctl-getroute");
return(1);
}
#else
if (getkerninfo(KINFO_RT_DUMP, sp, &needed, 0) < 0)
return(1);
#endif
ep = sp + needed;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
sa = (struct sockaddr *)(rtm + 1);
mask = 0xffffffff;
if (rtm->rtm_addrs == RTA_DST)
p_sockaddr(sa, 36);
else {
wp = (u_char *)cp + rtm->rtm_msglen;
p_sockaddr(sa, 16);
if (sa->sa_len == 0)
sa->sa_len = sizeof(long);
sa = (struct sockaddr *)(sa->sa_len + (char *)sa);
p_sockaddr(sa, 18);
lp = (int *)(sa->sa_len + (char *)sa);
if ((char *)lp < (char *)wp && *lp) {
#ifdef DEBUG
logprintf(" flag = %x, rest = %d", rtm->rtm_flags, *lp);
#endif
wp = (u_char *)(lp + 1);
mask = 0;
for (nb = *lp; nb > 4; nb--) {
mask <<= 8;
mask |= *wp++;
}
for (nb = 8 - *lp; nb > 0; nb--)
mask <<= 8;
}
}
printf("%08lx ", mask);
p_flags(rtm->rtm_flags & (RTF_UP|RTF_GATEWAY|RTF_HOST), "%-6.6s ");
printf("(%d)\n", rtm->rtm_index);
}
return(1);
}
/*
* Delete routes associated with our interface
*/
void
DeleteIfRoutes(all)
int all;
{
struct rt_msghdr *rtm;
struct sockaddr *sa;
struct in_addr dstnet, gateway;
int needed;
char *sp, *cp, *ep;
u_long mask;
int *lp, nb;
u_char *wp;
#if (BSD >= 199306)
int mib[6];
#endif
#ifdef DEBUG
logprintf("DeleteIfRoutes (%d)\n", IfIndex);
#endif
#if (BSD >= 199306)
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) {
perror("sysctl-estimate");
return;
}
#else
needed = getkerninfo(KINFO_RT_DUMP, 0, 0, 0);
#endif
if (needed < 0)
return;
sp = malloc(needed);
if (sp == NULL)
return;
#if (BSD >= 199306)
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
free(sp);
perror("sysctl-getroute");
return;
}
#else
if (getkerninfo(KINFO_RT_DUMP, sp, &needed, 0) < 0) {
free(sp);
return;
}
#endif
ep = sp + needed;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
sa = (struct sockaddr *)(rtm + 1);
#ifdef DEBUG
logprintf("addrs: %x, index: %d, flags: %x, dstnet: %x\n",
rtm->rtm_addrs, rtm->rtm_index, rtm->rtm_flags,
((struct sockaddr_in *)sa)->sin_addr);
#endif
if (rtm->rtm_addrs != RTA_DST &&
(rtm->rtm_index == IfIndex) &&
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
dstnet = ((struct sockaddr_in *)sa)->sin_addr;
wp = (u_char *)cp + rtm->rtm_msglen;
if (sa->sa_len == 0)
sa->sa_len = sizeof(long);
sa = (struct sockaddr *)(sa->sa_len + (char *)sa);
gateway = ((struct sockaddr_in *)sa)->sin_addr;
lp = (int *)(sa->sa_len + (char *)sa);
mask = 0;
if ((char *)lp < (char *)wp && *lp) {
#ifdef DEBUG
printf(" flag = %x, rest = %d", rtm->rtm_flags, *lp);
#endif
wp = (u_char *)(lp + 1);
for (nb = *lp; nb > 4; nb--) {
mask <<= 8;
mask |= *wp++;
}
for (nb = 8 - *lp; nb > 0; nb--)
mask <<= 8;
}
#ifdef DEBUG
logprintf("## %s ", inet_ntoa(dstnet));
logprintf(" %s %d\n", inet_ntoa(gateway), rtm->rtm_index);
#endif
if (dstnet.s_addr == INADDR_ANY) {
gateway.s_addr = INADDR_ANY;
mask = INADDR_ANY;
}
OsSetRoute(RTM_DELETE, dstnet, gateway, htonl(mask));
}
#ifdef DEBUG
else if (rtm->rtm_index == IfIndex) {
logprintf("??? addrs: %x, flags = %x\n", rtm->rtm_addrs, rtm->rtm_flags);
}
#endif
}
free(sp);
}
int
GetIfIndex(name)
char *name;
{
struct ifreq *ifrp;
int s, len, elen, index;
struct ifconf ifconfs;
struct ifreq reqbuf[32];
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket");
return(-1);
}
ifconfs.ifc_len = sizeof(reqbuf);
ifconfs.ifc_buf = (caddr_t)reqbuf;
if (ioctl(s, SIOCGIFCONF, &ifconfs) < 0) {
perror("IFCONF");
return(-1);
}
ifrp = ifconfs.ifc_req;
index = 1;
for (len = ifconfs.ifc_len; len > 0; len -= sizeof(struct ifreq)) {
elen = ifrp->ifr_addr.sa_len - sizeof(struct sockaddr);
if (ifrp->ifr_addr.sa_family == AF_LINK) {
#ifdef DEBUG
logprintf("%d: %-*.*s, %d, %d\n", index, IFNAMSIZ, IFNAMSIZ, ifrp->ifr_name,
ifrp->ifr_addr.sa_family, elen);
#endif
if (strcmp(ifrp->ifr_name, name) == 0) {
IfIndex = index;
return(index);
}
index++;
}
len -= elen;
ifrp = (struct ifreq *)((char *)ifrp + elen);
ifrp++;
}
close(s);
return(-1);
}