freebsd-dev/usr.sbin/ppp/ipcp.c
Brian Somers 927145be97 Overhaul ppp:
o Use syslog
  o Remove references to stdout/stderr (incl perror())
  o Introduce VarTerm - the interactive terminal or zero
  o Allow "set timeout" to affect current session
  o Change "set debug" to "set log"
  o Allow "set log [+|-]flag"
  o Make MSEXT and PASSWDAUTH stuff the default
  o Move all #ifdef DEBUG stuff into the code - this
    shouldn't be too much overhead.  It's now controlled
    with "set log +debug"
  o Add "set log command, debug, tun, warn, error, alert"
  o Remove cdefs.h, and assume an ansi compiler.
  o Improve all diagnostic output
  o Don't trap SIGSEGV
  o SIGHUP now terminates again (log files are controlled
    by syslog)
  o Call CloseModem() when changing devices
  o Fix parsing of third arg of "delete"

I think this fixes the "magic is same" problems that some
people have been experiencing.
The man page is being rewritten.  It'll follow soon.
1997-06-09 03:27:43 +00:00

581 lines
14 KiB
C

/*
* PPP IP Control Protocol (IPCP) Module
*
* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
*
* Copyright (C) 1993, 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: ipcp.c,v 1.20 1997/05/26 00:44:01 brian Exp $
*
* TODO:
* o More RFC1772 backwoard compatibility
*/
#include "fsm.h"
#include "lcpproto.h"
#include "lcp.h"
#include "ipcp.h"
#include <netdb.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include "slcompress.h"
#include "os.h"
#include "phase.h"
#include "loadalias.h"
#include "vars.h"
extern void PutConfValue();
extern void Prompt();
extern struct in_addr ifnetmask;
struct ipcpstate IpcpInfo;
struct in_range DefMyAddress, DefHisAddress, DefTriggerAddress;
#ifndef NOMSEXT
struct in_addr ns_entries[2], nbns_entries[2];
#endif
static void IpcpSendConfigReq(struct fsm *);
static void IpcpSendTerminateAck(struct fsm *);
static void IpcpSendTerminateReq(struct fsm *);
static void IpcpDecodeConfig(u_char *, int, int);
static void IpcpLayerStart(struct fsm *);
static void IpcpLayerFinish(struct fsm *);
static void IpcpLayerUp(struct fsm *);
static void IpcpLayerDown(struct fsm *);
static void IpcpInitRestartCounter(struct fsm *);
struct pppTimer IpcpReportTimer;
static int lastInOctets, lastOutOctets;
#define REJECTED(p, x) (p->his_reject & (1<<x))
struct fsm IpcpFsm = {
"IPCP",
PROTO_IPCP,
IPCP_MAXCODE,
OPEN_ACTIVE,
ST_INITIAL,
0, 0, 0,
0,
{ 0, 0, 0, NULL, NULL, NULL },
IpcpLayerUp,
IpcpLayerDown,
IpcpLayerStart,
IpcpLayerFinish,
IpcpInitRestartCounter,
IpcpSendConfigReq,
IpcpSendTerminateReq,
IpcpSendTerminateAck,
IpcpDecodeConfig,
};
static char *cftypes[] = {
"???", "IPADDRS", "COMPPROTO", "IPADDR",
};
/*
* Function called every second. Updates connection period and idle period,
* also update LQR information.
*/
static void
IpcpReportFunc()
{
ipConnectSecs++;
if (lastInOctets == ipInOctets && lastOutOctets == ipOutOctets)
ipIdleSecs++;
lastInOctets = ipInOctets;
lastOutOctets = ipOutOctets;
StopTimer(&IpcpReportTimer);
IpcpReportTimer.state = TIMER_STOPPED;
StartTimer(&IpcpReportTimer);
}
static void
IpcpStartReport()
{
ipIdleSecs = ipConnectSecs = 0;
StopTimer(&IpcpReportTimer);
IpcpReportTimer.state = TIMER_STOPPED;
IpcpReportTimer.load = SECTICKS;
IpcpReportTimer.func = IpcpReportFunc;
StartTimer(&IpcpReportTimer);
}
int
ReportIpcpStatus()
{
struct ipcpstate *icp = &IpcpInfo;
struct fsm *fp = &IpcpFsm;
if (!VarTerm)
return 1;
fprintf(VarTerm, "%s [%s]\n", fp->name, StateNames[fp->state]);
fprintf(VarTerm, " his side: %s, %lx\n",
inet_ntoa(icp->his_ipaddr), icp->his_compproto);
fprintf(VarTerm, " my side: %s, %lx\n",
inet_ntoa(icp->want_ipaddr), icp->want_compproto);
fprintf(VarTerm, "connected: %d secs, idle: %d secs\n\n", ipConnectSecs, ipIdleSecs);
fprintf(VarTerm, "Defaults:\n");
fprintf(VarTerm, " My Address: %s/%d\n",
inet_ntoa(DefMyAddress.ipaddr), DefMyAddress.width);
fprintf(VarTerm, " His Address: %s/%d\n",
inet_ntoa(DefHisAddress.ipaddr), DefHisAddress.width);
fprintf(VarTerm, " Negotiation: %s/%d\n",
inet_ntoa(DefTriggerAddress.ipaddr), DefTriggerAddress.width);
return 0;
}
void
IpcpDefAddress()
{
struct hostent *hp;
char name[200];
bzero(&DefMyAddress, sizeof(DefMyAddress));
bzero(&DefHisAddress, sizeof(DefHisAddress));
bzero(&DefTriggerAddress, sizeof(DefTriggerAddress));
if (gethostname(name, sizeof(name)) == 0) {
hp = gethostbyname(name);
if (hp && hp->h_addrtype == AF_INET) {
bcopy(hp->h_addr, (char *)&DefMyAddress.ipaddr.s_addr, hp->h_length);
}
}
}
void
IpcpInit()
{
struct ipcpstate *icp = &IpcpInfo;
FsmInit(&IpcpFsm);
bzero(icp, sizeof(struct ipcpstate));
if ((mode & MODE_DEDICATED) && !dstsystem) {
icp->want_ipaddr.s_addr = icp->his_ipaddr.s_addr = 0;
} else {
icp->want_ipaddr.s_addr = DefMyAddress.ipaddr.s_addr;
icp->his_ipaddr.s_addr = DefHisAddress.ipaddr.s_addr;
}
/*
* Some implementation of PPP are:
* Starting a negotiaion by require sending *special* value as my address,
* even though standard of PPP is defined full negotiation based.
* (e.g. "0.0.0.0" or Not "0.0.0.0")
*/
if ( icp->want_ipaddr.s_addr == 0 ) {
icp->want_ipaddr.s_addr = DefTriggerAddress.ipaddr.s_addr;
}
if (Enabled(ConfVjcomp))
icp->want_compproto = (PROTO_VJCOMP << 16) | ((MAX_STATES - 1) << 8);
else
icp->want_compproto = 0;
icp->heis1172 = 0;
IpcpFsm.maxconfig = 10;
}
static void
IpcpInitRestartCounter(fp)
struct fsm *fp;
{
fp->FsmTimer.load = VarRetryTimeout * SECTICKS;
fp->restart = 5;
}
static void
IpcpSendConfigReq(fp)
struct fsm *fp;
{
u_char *cp;
struct ipcpstate *icp = &IpcpInfo;
cp = ReqBuff;
LogPrintf(LogLCP, "IpcpSendConfigReq\n");
if (!DEV_IS_SYNC || !REJECTED(icp, TY_IPADDR))
PutConfValue(&cp, cftypes, TY_IPADDR, 6, ntohl(icp->want_ipaddr.s_addr));
if (icp->want_compproto && !REJECTED(icp, TY_COMPPROTO)) {
if (icp->heis1172)
PutConfValue(&cp, cftypes, TY_COMPPROTO, 4, icp->want_compproto >> 16);
else
PutConfValue(&cp, cftypes, TY_COMPPROTO, 6, icp->want_compproto);
}
FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff);
}
static void
IpcpSendTerminateReq(fp)
struct fsm *fp;
{
/* XXX: No code yet */
}
static void
IpcpSendTerminateAck(fp)
struct fsm *fp;
{
LogPrintf(LogLCP, "IpcpSendTerminateAck\n");
FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0);
}
static void
IpcpLayerStart(fp)
struct fsm *fp;
{
LogPrintf(LogLCP, "IpcpLayerStart.\n");
}
static void
IpcpLayerFinish(fp)
struct fsm *fp;
{
LogPrintf(LogLCP, "IpcpLayerFinish.\n");
reconnect(RECON_FALSE);
LcpClose();
NewPhase(PHASE_TERMINATE);
}
static void
IpcpLayerDown(fp)
struct fsm *fp;
{
LogPrintf(LogLCP, "IpcpLayerDown.\n");
StopTimer(&IpcpReportTimer);
}
/*
* Called when IPCP has reached to OPEN state
*/
static void
IpcpLayerUp(fp)
struct fsm *fp;
{
char tbuff[100];
Prompt();
LogPrintf(LogLCP, "IpcpLayerUp(%d).\n", fp->state);
snprintf(tbuff, sizeof(tbuff), "myaddr = %s ",
inet_ntoa(IpcpInfo.want_ipaddr));
LogPrintf(LogIsKept(LogLCP) ? LogLCP : LogLINK, " %s hisaddr = %s\n",
tbuff, inet_ntoa(IpcpInfo.his_ipaddr));
if (OsSetIpaddress(IpcpInfo.want_ipaddr, IpcpInfo.his_ipaddr, ifnetmask) < 0) {
if (VarTerm)
LogPrintf(LogERROR, "IpcpLayerUp: unable to set ip address\n");
return;
}
OsLinkup();
IpcpStartReport();
StartIdleTimer();
if (mode & MODE_ALIAS)
VarSetPacketAliasAddress(IpcpInfo.want_ipaddr);
}
void
IpcpUp()
{
FsmUp(&IpcpFsm);
LogPrintf(LogLCP, "IPCP Up event!!\n");
}
void
IpcpOpen()
{
FsmOpen(&IpcpFsm);
}
static int
AcceptableAddr(prange, ipaddr)
struct in_range *prange;
struct in_addr ipaddr;
{
LogPrintf(LogDEBUG, "requested = %x ", htonl(ipaddr.s_addr));
LogPrintf(LogDEBUG, "range = %x", htonl(prange->ipaddr.s_addr));
LogPrintf(LogDEBUG, "/%x\n", htonl(prange->mask.s_addr));
LogPrintf(LogDEBUG, "%x, %x\n", htonl(prange->ipaddr.s_addr & prange->
mask.s_addr), htonl(ipaddr.s_addr & prange->mask.s_addr));
return (prange->ipaddr.s_addr & prange->mask.s_addr) ==
(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
}
static void
IpcpDecodeConfig(cp, plen, mode)
u_char *cp;
int plen;
int mode;
{
int type, length;
u_long *lp, compproto;
struct compreq *pcomp;
struct in_addr ipaddr, dstipaddr, dnsstuff, ms_info_req;
char tbuff[100];
char tbuff2[100];
ackp = AckBuff;
nakp = NakBuff;
rejp = RejBuff;
while (plen >= sizeof(struct fsmconfig)) {
if (plen < 0)
break;
type = *cp;
length = cp[1];
if (type <= TY_IPADDR)
snprintf(tbuff, sizeof(tbuff), " %s[%d] ", cftypes[type], length);
else
snprintf(tbuff, sizeof(tbuff), " ");
switch (type) {
case TY_IPADDR: /* RFC1332 */
lp = (u_long *)(cp + 2);
ipaddr.s_addr = *lp;
LogPrintf(LogLCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
switch (mode) {
case MODE_REQ:
if (!AcceptableAddr(&DefHisAddress, ipaddr)) {
/*
* If destination address is not acceptable, insist to use
* what we want to use.
*/
bcopy(cp, nakp, 2);
bcopy(&IpcpInfo.his_ipaddr.s_addr, nakp+2, length);
nakp += length;
break;
}
IpcpInfo.his_ipaddr = ipaddr;
bcopy(cp, ackp, length);
ackp += length;
break;
case MODE_NAK:
if (AcceptableAddr(&DefMyAddress, ipaddr)) {
/*
* Use address suggested by peer.
*/
snprintf(tbuff2, sizeof(tbuff2), "%s changing address: %s ", tbuff, inet_ntoa(IpcpInfo.want_ipaddr));
LogPrintf(LogLCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
IpcpInfo.want_ipaddr = ipaddr;
}
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_COMPPROTO:
lp = (u_long *)(cp + 2);
compproto = htonl(*lp);
LogPrintf(LogLCP, "%s %08x\n", tbuff, compproto);
switch (mode) {
case MODE_REQ:
if (!Acceptable(ConfVjcomp)) {
bcopy(cp, rejp, length);
rejp += length;
} else {
pcomp = (struct compreq *)(cp + 2);
switch (length) {
case 4: /* RFC1172 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
LogPrintf(LogWARN, "Peer is speaking RFC1172 compression protocol !n");
IpcpInfo.heis1172 = 1;
IpcpInfo.his_compproto = compproto;
bcopy(cp, ackp, length);
ackp += length;
} else {
bcopy(cp, nakp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
bcopy(&pcomp, nakp + 2, 2);
nakp += length;
}
break;
case 6: /* RFC1332 */
if (ntohs(pcomp->proto) == PROTO_VJCOMP
&& pcomp->slots < MAX_STATES && pcomp->slots > 2) {
IpcpInfo.his_compproto = compproto;
IpcpInfo.heis1172 = 0;
bcopy(cp, ackp, length);
ackp += length;
} else {
bcopy(cp, nakp, 2);
pcomp->proto = htons(PROTO_VJCOMP);
pcomp->slots = MAX_STATES - 1;
pcomp->compcid = 0;
bcopy(&pcomp, nakp + 2, sizeof(pcomp));
nakp += length;
}
break;
default:
bcopy(cp, rejp, length);
rejp += length;
break;
}
}
break;
case MODE_NAK:
LogPrintf(LogLCP, "%s changing compproto: %08x --> %08x\n",
tbuff, IpcpInfo.want_compproto, compproto);
IpcpInfo.want_compproto = compproto;
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
case TY_IPADDRS: /* RFC1172 */
lp = (u_long *)(cp + 2);
ipaddr.s_addr = *lp;
lp = (u_long *)(cp + 6);
dstipaddr.s_addr = *lp;
LogPrintf(LogLCP, "%s %s, ", tbuff, inet_ntoa(ipaddr));
LogPrintf(LogLCP, "%s\n", inet_ntoa(dstipaddr));
switch (mode) {
case MODE_REQ:
IpcpInfo.his_ipaddr = ipaddr;
IpcpInfo.want_ipaddr = dstipaddr;
bcopy(cp, ackp, length);
ackp += length;
break;
case MODE_NAK:
LogPrintf(LogLCP, "%s changing address: %s ",
tbuff, inet_ntoa(IpcpInfo.want_ipaddr));
LogPrintf(LogLCP, "--> %s\n", inet_ntoa(ipaddr));
IpcpInfo.want_ipaddr = ipaddr;
IpcpInfo.his_ipaddr = dstipaddr;
break;
case MODE_REJ:
IpcpInfo.his_reject |= (1 << type);
break;
}
break;
/*
* MS extensions for MS's PPP
*/
#ifndef NOMSEXT
case TY_PRIMARY_DNS: /* MS PPP DNS negotiation hack */
case TY_SECONDARY_DNS:
if( !Enabled( ConfMSExt ) ) {
LogPrintf(LogLCP, "MS NS req - rejected - msext disabled\n");
IpcpInfo.my_reject |= ( 1 << type );
bcopy(cp, rejp, length);
rejp += length;
break;
}
switch( mode ){
case MODE_REQ:
lp = (u_long *)(cp + 2);
dnsstuff.s_addr = *lp;
ms_info_req.s_addr = ns_entries[((type - TY_PRIMARY_DNS)?1:0)].s_addr;
if( dnsstuff.s_addr != ms_info_req.s_addr )
{
/*
So the client has got the DNS stuff wrong (first request)
so well tell 'em how it is
*/
bcopy( cp, nakp, 2 ); /* copy first two (type/length) */
LogPrintf( LogLCP, "MS NS req %d:%s->%s - nak\n",
type,
inet_ntoa( dnsstuff ),
inet_ntoa( ms_info_req ));
bcopy( &ms_info_req, nakp+2, length );
nakp += length;
break;
}
/*
Otherwise they have it right (this time) so we send
a ack packet back confirming it... end of story
*/
LogPrintf( LogLCP, "MS NS req %d:%s ok - ack\n",
type,
inet_ntoa( ms_info_req ));
bcopy( cp, ackp, length );
ackp += length;
break;
case MODE_NAK: /* what does this mean?? */
LogPrintf(LogLCP, "MS NS req %d - NAK??\n", type );
break;
case MODE_REJ: /* confused?? me to :) */
LogPrintf(LogLCP, "MS NS req %d - REJ??\n", type );
break;
}
break;
case TY_PRIMARY_NBNS: /* MS PPP NetBIOS nameserver hack */
case TY_SECONDARY_NBNS:
if( !Enabled( ConfMSExt ) ) {
LogPrintf( LogLCP, "MS NBNS req - rejected - msext disabled\n" );
IpcpInfo.my_reject |= ( 1 << type );
bcopy( cp, rejp, length );
rejp += length;
break;
}
switch( mode ){
case MODE_REQ:
lp = (u_long *)(cp + 2);
dnsstuff.s_addr = *lp;
ms_info_req.s_addr = nbns_entries[((type - TY_PRIMARY_NBNS)?1:0)].s_addr;
if( dnsstuff.s_addr != ms_info_req.s_addr )
{
bcopy( cp, nakp, 2 );
bcopy( &ms_info_req.s_addr , nakp+2, length );
LogPrintf( LogLCP, "MS NBNS req %d:%s->%s - nak\n",
type,
inet_ntoa( dnsstuff ),
inet_ntoa( ms_info_req ));
nakp += length;
break;
}
LogPrintf( LogLCP, "MS NBNS req %d:%s ok - ack\n",
type,
inet_ntoa( ms_info_req ));
bcopy( cp, ackp, length );
ackp += length;
break;
case MODE_NAK:
LogPrintf( LogLCP, "MS NBNS req %d - NAK??\n", type );
break;
case MODE_REJ:
LogPrintf( LogLCP, "MS NBNS req %d - REJ??\n", type );
break;
}
break;
#endif
default:
IpcpInfo.my_reject |= (1 << type);
bcopy(cp, rejp, length);
rejp += length;
break;
}
plen -= length;
cp += length;
}
}
void
IpcpInput(struct mbuf *bp)
{
FsmInput(&IpcpFsm, bp);
}