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freebsd/usr.sbin/ppp/route.c
Brian Somers 9cb1d89ee2 Understand how to derive the names of interfaces 
when they aren't ordered.  This is probably vital
for laptop support ;-I
1997-11-22 13:46:02 +00:00

485 lines
12 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 1.27 1997/11/22 03:37:44 brian Exp $
*
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/if.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if_dl.h>
#include <errno.h>
#include <machine/endian.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <unistd.h>
#include "command.h"
#include "mbuf.h"
#include "log.h"
#include "loadalias.h"
#include "defs.h"
#include "vars.h"
#include "id.h"
#include "route.h"
static int IfIndex;
struct rtmsg {
struct rt_msghdr m_rtm;
char m_space[64];
};
static int seqno;
void
OsSetRoute(int cmd,
struct in_addr dst,
struct in_addr gateway,
struct in_addr mask)
{
struct rtmsg rtmes;
int s, nb, wb;
char *cp;
const char *cmdstr;
u_long *lp;
struct sockaddr_in rtdata;
cmdstr = (cmd == RTM_ADD ? "Add" : "Delete");
s = ID0socket(PF_ROUTE, SOCK_RAW, 0);
if (s < 0) {
LogPrintf(LogERROR, "OsSetRoute: socket(): %s\n", strerror(errno));
return;
}
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 | RTA_NETMASK;
rtmes.m_rtm.rtm_seq = ++seqno;
rtmes.m_rtm.rtm_pid = getpid();
rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
memset(&rtdata, '\0', sizeof(rtdata));
rtdata.sin_len = 16;
rtdata.sin_family = AF_INET;
rtdata.sin_port = 0;
rtdata.sin_addr = dst;
cp = rtmes.m_space;
memcpy(cp, &rtdata, 16);
cp += 16;
if (gateway.s_addr) {
rtdata.sin_addr = gateway;
memcpy(cp, &rtdata, 16);
cp += 16;
rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY;
}
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 0:
LogPrintf(LogTCPIP, "%s route failed: %s\n", cmdstr, strerror(errno));
break;
case ENOBUFS:
default:
LogPrintf(LogTCPIP, "%s route failed: %s\n",
cmdstr, strerror(rtmes.m_rtm.rtm_errno));
break;
}
}
LogPrintf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n",
wb, cmdstr, dst.s_addr, gateway.s_addr);
close(s);
}
static void
p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width)
{
char buf[29];
const char *cp;
struct sockaddr_in *ihost = (struct sockaddr_in *)phost;
struct sockaddr_in *mask = (struct sockaddr_in *)pmask;
struct sockaddr_dl *dl = (struct sockaddr_dl *)phost;
switch (phost->sa_family) {
case AF_INET:
if (!phost)
cp = "";
else if (ihost->sin_addr.s_addr == INADDR_ANY)
cp = "default";
else if (!mask)
cp = inet_ntoa(ihost->sin_addr);
else {
u_int msk = ntohl(mask->sin_addr.s_addr);
u_int tst;
int bits;
int len;
struct sockaddr_in net;
for (tst = 1, bits=32; tst; tst <<= 1, bits--)
if (msk & tst)
break;
for (tst <<=1; tst; tst <<= 1)
if (!(msk & tst))
break;
net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr;
sprintf(buf, "%s", inet_ntoa(net.sin_addr));
for (len = strlen(buf); len > 3; buf[len-=2] = '\0')
if (strcmp(buf+len-2, ".0"))
break;
if (tst) /* non-contiguous :-( */
sprintf(buf+strlen(buf),"&0x%08x", msk);
else
sprintf(buf+strlen(buf), "/%d", bits);
cp = buf;
}
break;
case AF_LINK:
if (!dl)
cp = "";
else if (dl->sdl_nlen == 0 && dl->sdl_alen == 0 && dl->sdl_slen == 0) {
sprintf(buf, "link#%d", dl->sdl_index);
cp = buf;
} else if (dl->sdl_type == IFT_ETHER && dl->sdl_alen &&
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';
cp = buf;
} else
cp = "???";
break;
default:
cp = "???";
break;
}
fprintf(VarTerm, "%-*s ", width-1, cp);
}
struct bits {
u_long 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_CLONING, 'C' },
{ RTF_XRESOLVE, 'X' },
{ RTF_LLINFO, 'L' },
{ RTF_STATIC, 'S' },
{ RTF_PROTO1, '1' },
{ RTF_PROTO2, '2' },
{ RTF_BLACKHOLE, 'B' },
#ifdef __FreeBSD__
{ RTF_WASCLONED, 'W' },
{ RTF_PRCLONING, 'c' },
{ RTF_PROTO3, '3' },
{ RTF_BROADCAST, 'b' },
#endif
{ 0, '\0' }
};
static void
p_flags(u_long f, const 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);
}
}
static const char *
Index2Nam(int idx)
{
static char ifs[50][6];
static int nifs, debug_done;
if (!nifs) {
int mib[6], needed, len;
char *buf, *ptr, *end;
struct sockaddr_dl *dl;
struct if_msghdr *ifm;
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) {
LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno));
return "???";
}
if ((buf = malloc(needed)) == NULL)
return "???";
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
free(buf);
return "???";
}
end = buf + needed;
for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)ptr;
dl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_index > 0 && ifm->ifm_index <= sizeof(ifs)/sizeof(ifs[0])
&& ifs[ifm->ifm_index-1][0] == '\0') {
if ((len = dl->sdl_nlen) > sizeof(ifs[0])-1)
len = sizeof(ifs[0])-1;
strncpy(ifs[ifm->ifm_index-1], dl->sdl_data, len);
ifs[ifm->ifm_index-1][len] = '\0';
if (len && nifs < ifm->ifm_index)
nifs = ifm->ifm_index;
} else if (LogIsKept(LogDEBUG))
LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n",
ifm->ifm_index);
}
free(buf);
}
if (LogIsKept(LogDEBUG) && !debug_done) {
int f;
LogPrintf(LogDEBUG, "Found the following interfaces:\n");
for (f = 0; f < nifs; f++)
if (*ifs[f] != '\0')
LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]);
debug_done = 1;
}
if (idx < 1 || idx > nifs || ifs[idx-1][0] == '\0')
return "???";
return ifs[idx-1];
}
int
ShowRoute(struct cmdargs const *arg)
{
struct rt_msghdr *rtm;
struct sockaddr *sa_dst, *sa_gw, *sa_mask;
char *sp, *ep, *cp, *wp;
int needed;
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, "ShowRoute: sysctl: estimate: %s\n", 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, "ShowRoute: sysctl: getroute: %s\n", strerror(errno));
free(sp);
return (1);
}
ep = sp + needed;
fprintf(VarTerm, "%-20s%-20sFlags Netif\n", "Destination", "Gateway");
for (cp = sp; cp < ep; cp += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *) cp;
wp = (char *)(rtm+1);
if (rtm->rtm_addrs & RTA_DST) {
sa_dst = (struct sockaddr *)wp;
wp += sa_dst->sa_len;
} else
sa_dst = NULL;
if (rtm->rtm_addrs & RTA_GATEWAY) {
sa_gw = (struct sockaddr *)wp;
wp += sa_gw->sa_len;
} else
sa_gw = NULL;
if (rtm->rtm_addrs & RTA_NETMASK) {
sa_mask = (struct sockaddr *)wp;
wp += sa_mask->sa_len;
} else
sa_mask = NULL;
p_sockaddr(sa_dst, sa_mask, 20);
p_sockaddr(sa_gw, NULL, 20);
p_flags(rtm->rtm_flags, "%-6.6s ");
fprintf(VarTerm, "%s\n", Index2Nam(rtm->rtm_index));
}
free(sp);
return 0;
}
/*
* Delete routes associated with our interface
*/
void
DeleteIfRoutes(int all)
{
struct rt_msghdr *rtm;
struct sockaddr *sa;
struct in_addr sa_dst, sa_gw, sa_mask;
int needed;
char *sp, *cp, *ep;
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, "DeleteIfRoutes: sysctl: estimate: %s\n",
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, "DeleteIfRoutes: 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;
sa = (struct sockaddr *) (rtm + 1);
LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s), flags: %x,"
" dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index,
Index2Nam(rtm->rtm_index), rtm->rtm_flags,
inet_ntoa(((struct sockaddr_in *) sa)->sin_addr));
if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY &&
rtm->rtm_index == IfIndex &&
(all || (rtm->rtm_flags & RTF_GATEWAY))) {
sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
wp = (u_char *) cp + rtm->rtm_msglen;
sa = (struct sockaddr *)((char *)sa + sa->sa_len);
if (sa->sa_family == AF_INET) {
LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it\n");
sa_gw.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
sa = (struct sockaddr *)((char *)sa + sa->sa_len);
if (rtm->rtm_addrs & RTA_NETMASK)
sa_mask.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
else
sa_mask.s_addr = 0xffffffff;
if (sa_dst.s_addr == INADDR_ANY)
sa_mask.s_addr = INADDR_ANY;
LogPrintf(LogDEBUG, "DeleteIfRoutes: Dst: %s\n", inet_ntoa(sa_dst));
LogPrintf(LogDEBUG, "DeleteIfRoutes: Gw: %s\n", inet_ntoa(sa_gw));
LogPrintf(LogDEBUG, "DeleteIfRoutes: Index: %d\n", rtm->rtm_index);
OsSetRoute(RTM_DELETE, sa_dst, sa_gw, sa_mask);
} else
LogPrintf(LogDEBUG, "DeleteIfRoutes: Can't remove an AF_LINK !\n");
}
}
free(sp);
}
int
GetIfIndex(char *name)
{
int idx;
const char *got;
idx = 1;
while (strcmp(got = Index2Nam(idx), "???"))
if (!strcmp(got, name))
return IfIndex = idx;
else
idx++;
return -1;
}
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