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freebsd/usr.sbin/ppp/route.c
Brian Somers 6614d8c5f3 Fix file descriptor leaks.
1997-07-28 01:02:27 +00:00

414 lines
10 KiB
C
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/*
* 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 1.16 1997/06/20 23:43:35 brian Exp $
*
*/
#include <sys/types.h>
#include <machine/endian.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "log.h"
#include "loadalias.h"
#include "vars.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(LogERROR, "OsSetRoute: socket: %s", strerror(errno));
return;
}
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 | RTA_GATEWAY;
rtmes.m_rtm.rtm_seq = ++seqno;
rtmes.m_rtm.rtm_pid = getpid();
rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
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(LogTCPIP, "OsSetRoute: Dst = %s\n", inet_ntoa(dst));
LogPrintf(LogTCPIP, "OsSetRoute: Gateway = %s\n", inet_ntoa(gateway));
LogPrintf(LogTCPIP, "OsSetRoute: Mask = %s\n", inet_ntoa(mask));
switch(rtmes.m_rtm.rtm_errno) {
case EEXIST:
LogPrintf(LogTCPIP, "Add route failed: Already exists\n");
break;
case ESRCH:
LogPrintf(LogTCPIP, "Del route failed: Non-existent\n");
break;
case ENOBUFS:
default:
LogPrintf(LogTCPIP, "Add/Del route failed: %s\n",
strerror(rtmes.m_rtm.rtm_errno));
break;
}
}
LogPrintf(LogDEBUG, "wrote %d: dst = %x, gateway = %x\n", nb,
dst.s_addr, gateway.s_addr);
close(s);
}
static void
p_sockaddr(sa, width)
struct sockaddr *sa;
int width;
{
if (VarTerm) {
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);
fprintf(VarTerm, "%-*.*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;
{
if (VarTerm) {
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';
fprintf(VarTerm, 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;
int mib[6];
if (!VarTerm)
return 1;
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) {
LogPrintf(LogERROR, "sysctl: estimate: %s", strerror(errno));
return(1);
}
if (needed < 0)
return(1);
sp = malloc(needed);
if (sp == NULL)
return(1);
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
LogPrintf(LogERROR, "sysctl: getroute: %s", strerror(errno));
free(sp);
return(1);
}
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) {
LogPrintf(LogDEBUG, " flag = %x, rest = %d", rtm->rtm_flags, *lp);
wp = (u_char *)(lp + 1);
mask = 0;
for (nb = *(char *)lp; nb > 4; nb--) {
mask <<= 8;
mask |= *wp++;
}
for (nb = 8 - *(char *)lp; nb > 0; nb--)
mask <<= 8;
}
}
fprintf(VarTerm, "%08lx ", mask);
p_flags(rtm->rtm_flags & (RTF_UP|RTF_GATEWAY|RTF_HOST), "%-6.6s ");
fprintf(VarTerm, "(%d)\n", rtm->rtm_index);
}
free(sp);
return 0;
}
/*
* Delete routes associated with our interface
*/
void
DeleteIfRoutes(all)
int all;
{
struct rt_msghdr *rtm;
struct sockaddr *sa;
struct in_addr dstnet, gateway, maddr;
int needed;
char *sp, *cp, *ep;
u_long mask;
int *lp, nb;
u_char *wp;
int mib[6];
LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", IfIndex);
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) {
LogPrintf(LogERROR, "sysctl: estimate: %s", strerror(errno));
return;
}
if (needed < 0)
return;
sp = malloc(needed);
if (sp == NULL)
return;
if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) {
LogPrintf(LogERROR, "sysctl: getroute: %s", strerror(errno));
free(sp);
return;
}
ep = sp + needed;
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)cp;
sa = (struct sockaddr *)(rtm + 1);
LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, index: %d, flags: %x,"
" dstnet: %s\n",
rtm->rtm_addrs, rtm->rtm_index, rtm->rtm_flags,
inet_ntoa(((struct sockaddr_in *)sa)->sin_addr));
if (rtm->rtm_addrs != RTA_DST &&
(rtm->rtm_index == IfIndex) &&
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it\n");
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) {
LogPrintf(LogDEBUG, "DeleteIfRoutes: flag = %x, rest = %d",
rtm->rtm_flags, *lp);
wp = (u_char *)(lp + 1);
for (nb = *lp; nb > 4; nb--) {
mask <<= 8;
mask |= *wp++;
}
for (nb = 8 - *lp; nb > 0; nb--)
mask <<= 8;
}
LogPrintf(LogDEBUG, "DeleteIfRoutes: Dst: %s\n", inet_ntoa(dstnet));
LogPrintf(LogDEBUG, "DeleteIfRoutes: Gw: %s\n", inet_ntoa(gateway));
LogPrintf(LogDEBUG, "DeleteIfRoutes: Index: %d\n", rtm->rtm_index);
if (dstnet.s_addr == INADDR_ANY)
mask = INADDR_ANY;
maddr.s_addr = htonl(mask);
OsSetRoute(RTM_DELETE, dstnet, gateway, maddr);
}
}
free(sp);
}
/*
* 960603 - Modified to use dynamic buffer allocator as in ifconfig
*/
int
GetIfIndex(name)
char *name;
{
char *buffer;
struct ifreq *ifrp;
int s, len, elen, index;
struct ifconf ifconfs;
/* struct ifreq reqbuf[256]; -- obsoleted :) */
int oldbufsize, bufsize = sizeof(struct ifreq);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
LogPrintf(LogERROR, "GetIfIndex: socket: %s", strerror(errno));
return(-1);
}
buffer = malloc(bufsize); /* allocate first buffer */
ifconfs.ifc_len = bufsize; /* Initial setting */
/*
* Iterate through here until we don't get many more data
*/
do {
oldbufsize = ifconfs.ifc_len;
bufsize += 1+sizeof(struct ifreq);
buffer = realloc((void *)buffer, bufsize); /* Make it bigger */
LogPrintf(LogDEBUG, "GetIfIndex: Growing buffer to %d\n", bufsize);
ifconfs.ifc_len = bufsize;
ifconfs.ifc_buf = buffer;
if (ioctl(s, SIOCGIFCONF, &ifconfs) < 0) {
LogPrintf(LogERROR, "ioctl(SIOCGIFCONF): %s", strerror(errno));
close(s);
free(buffer);
return(-1);
}
} while (ifconfs.ifc_len > oldbufsize);
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) {
LogPrintf(LogDEBUG, "GetIfIndex: %d: %-*.*s, %d, %d\n",
index, IFNAMSIZ, IFNAMSIZ, ifrp->ifr_name,
ifrp->ifr_addr.sa_family, elen);
if (strcmp(ifrp->ifr_name, name) == 0) {
IfIndex = index;
close(s);
free(buffer);
return(index);
}
index++;
}
len -= elen;
ifrp = (struct ifreq *)((char *)ifrp + elen);
ifrp++;
}
close(s);
free(buffer);
return(-1);
}
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