581 lines
14 KiB
C
581 lines
14 KiB
C
/*
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* PPP IP Control Protocol (IPCP) Module
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*
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* Written by Toshiharu OHNO (tony-o@iij.ad.jp)
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*
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* Copyright (C) 1993, Internet Initiative Japan, Inc. All rights reserverd.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the Internet Initiative Japan, Inc. The name of the
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* IIJ may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $Id: ipcp.c,v 1.22 1997/06/25 19:30:00 brian Exp $
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*
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* TODO:
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* o More RFC1772 backwoard compatibility
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*/
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#include "fsm.h"
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#include "lcpproto.h"
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#include "lcp.h"
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#include "ipcp.h"
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#include <netdb.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#include "slcompress.h"
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#include "os.h"
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#include "phase.h"
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#include "loadalias.h"
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#include "vars.h"
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extern void PutConfValue();
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extern void Prompt();
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extern struct in_addr ifnetmask;
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struct ipcpstate IpcpInfo;
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struct in_range DefMyAddress, DefHisAddress, DefTriggerAddress;
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#ifndef NOMSEXT
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struct in_addr ns_entries[2], nbns_entries[2];
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#endif
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static void IpcpSendConfigReq(struct fsm *);
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static void IpcpSendTerminateAck(struct fsm *);
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static void IpcpSendTerminateReq(struct fsm *);
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static void IpcpDecodeConfig(u_char *, int, int);
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static void IpcpLayerStart(struct fsm *);
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static void IpcpLayerFinish(struct fsm *);
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static void IpcpLayerUp(struct fsm *);
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static void IpcpLayerDown(struct fsm *);
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static void IpcpInitRestartCounter(struct fsm *);
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struct pppTimer IpcpReportTimer;
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static int lastInOctets, lastOutOctets;
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#define REJECTED(p, x) (p->his_reject & (1<<x))
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struct fsm IpcpFsm = {
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"IPCP",
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PROTO_IPCP,
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IPCP_MAXCODE,
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OPEN_ACTIVE,
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ST_INITIAL,
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0, 0, 0,
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0,
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{ 0, 0, 0, NULL, NULL, NULL },
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IpcpLayerUp,
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IpcpLayerDown,
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IpcpLayerStart,
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IpcpLayerFinish,
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IpcpInitRestartCounter,
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IpcpSendConfigReq,
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IpcpSendTerminateReq,
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IpcpSendTerminateAck,
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IpcpDecodeConfig,
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};
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static char *cftypes[] = {
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"???", "IPADDRS", "COMPPROTO", "IPADDR",
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};
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/*
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* Function called every second. Updates connection period and idle period,
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* also update LQR information.
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*/
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static void
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IpcpReportFunc()
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{
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ipConnectSecs++;
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if (lastInOctets == ipInOctets && lastOutOctets == ipOutOctets)
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ipIdleSecs++;
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lastInOctets = ipInOctets;
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lastOutOctets = ipOutOctets;
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StopTimer(&IpcpReportTimer);
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IpcpReportTimer.state = TIMER_STOPPED;
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StartTimer(&IpcpReportTimer);
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}
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static void
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IpcpStartReport()
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{
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ipIdleSecs = ipConnectSecs = 0;
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StopTimer(&IpcpReportTimer);
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IpcpReportTimer.state = TIMER_STOPPED;
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IpcpReportTimer.load = SECTICKS;
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IpcpReportTimer.func = IpcpReportFunc;
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StartTimer(&IpcpReportTimer);
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}
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int
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ReportIpcpStatus()
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{
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struct ipcpstate *icp = &IpcpInfo;
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struct fsm *fp = &IpcpFsm;
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if (!VarTerm)
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return 1;
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fprintf(VarTerm, "%s [%s]\n", fp->name, StateNames[fp->state]);
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fprintf(VarTerm, " his side: %s, %lx\n",
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inet_ntoa(icp->his_ipaddr), icp->his_compproto);
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fprintf(VarTerm, " my side: %s, %lx\n",
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inet_ntoa(icp->want_ipaddr), icp->want_compproto);
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fprintf(VarTerm, "connected: %d secs, idle: %d secs\n\n", ipConnectSecs, ipIdleSecs);
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fprintf(VarTerm, "Defaults:\n");
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fprintf(VarTerm, " My Address: %s/%d\n",
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inet_ntoa(DefMyAddress.ipaddr), DefMyAddress.width);
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fprintf(VarTerm, " His Address: %s/%d\n",
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inet_ntoa(DefHisAddress.ipaddr), DefHisAddress.width);
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fprintf(VarTerm, " Negotiation: %s/%d\n",
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inet_ntoa(DefTriggerAddress.ipaddr), DefTriggerAddress.width);
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return 0;
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}
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void
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IpcpDefAddress()
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{
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struct hostent *hp;
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char name[200];
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bzero(&DefMyAddress, sizeof(DefMyAddress));
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bzero(&DefHisAddress, sizeof(DefHisAddress));
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bzero(&DefTriggerAddress, sizeof(DefTriggerAddress));
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if (gethostname(name, sizeof(name)) == 0) {
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hp = gethostbyname(name);
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if (hp && hp->h_addrtype == AF_INET) {
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bcopy(hp->h_addr, (char *)&DefMyAddress.ipaddr.s_addr, hp->h_length);
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}
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}
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}
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void
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IpcpInit()
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{
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struct ipcpstate *icp = &IpcpInfo;
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FsmInit(&IpcpFsm);
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bzero(icp, sizeof(struct ipcpstate));
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if ((mode & MODE_DEDICATED) && !dstsystem) {
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icp->want_ipaddr.s_addr = icp->his_ipaddr.s_addr = 0;
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} else {
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icp->want_ipaddr.s_addr = DefMyAddress.ipaddr.s_addr;
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icp->his_ipaddr.s_addr = DefHisAddress.ipaddr.s_addr;
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}
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/*
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* Some implementation of PPP are:
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* Starting a negotiaion by require sending *special* value as my address,
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* even though standard of PPP is defined full negotiation based.
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* (e.g. "0.0.0.0" or Not "0.0.0.0")
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*/
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if ( icp->want_ipaddr.s_addr == 0 ) {
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icp->want_ipaddr.s_addr = DefTriggerAddress.ipaddr.s_addr;
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}
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if (Enabled(ConfVjcomp))
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icp->want_compproto = (PROTO_VJCOMP << 16) | ((MAX_STATES - 1) << 8);
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else
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icp->want_compproto = 0;
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icp->heis1172 = 0;
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IpcpFsm.maxconfig = 10;
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}
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static void
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IpcpInitRestartCounter(fp)
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struct fsm *fp;
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{
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fp->FsmTimer.load = VarRetryTimeout * SECTICKS;
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fp->restart = 5;
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}
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static void
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IpcpSendConfigReq(fp)
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struct fsm *fp;
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{
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u_char *cp;
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struct ipcpstate *icp = &IpcpInfo;
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cp = ReqBuff;
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LogPrintf(LogLCP, "IpcpSendConfigReq\n");
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if (!DEV_IS_SYNC || !REJECTED(icp, TY_IPADDR))
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PutConfValue(&cp, cftypes, TY_IPADDR, 6, ntohl(icp->want_ipaddr.s_addr));
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if (icp->want_compproto && !REJECTED(icp, TY_COMPPROTO)) {
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if (icp->heis1172)
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PutConfValue(&cp, cftypes, TY_COMPPROTO, 4, icp->want_compproto >> 16);
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else
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PutConfValue(&cp, cftypes, TY_COMPPROTO, 6, icp->want_compproto);
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}
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FsmOutput(fp, CODE_CONFIGREQ, fp->reqid++, ReqBuff, cp - ReqBuff);
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}
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static void
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IpcpSendTerminateReq(fp)
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struct fsm *fp;
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{
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/* XXX: No code yet */
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}
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static void
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IpcpSendTerminateAck(fp)
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struct fsm *fp;
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{
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LogPrintf(LogLCP, "IpcpSendTerminateAck\n");
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FsmOutput(fp, CODE_TERMACK, fp->reqid++, NULL, 0);
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}
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static void
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IpcpLayerStart(fp)
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struct fsm *fp;
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{
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LogPrintf(LogLCP, "IpcpLayerStart.\n");
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}
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static void
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IpcpLayerFinish(fp)
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struct fsm *fp;
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{
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LogPrintf(LogLCP, "IpcpLayerFinish.\n");
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reconnect(RECON_FALSE);
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LcpClose();
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NewPhase(PHASE_TERMINATE);
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}
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static void
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IpcpLayerDown(fp)
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struct fsm *fp;
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{
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LogPrintf(LogLCP, "IpcpLayerDown.\n");
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StopTimer(&IpcpReportTimer);
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}
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/*
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* Called when IPCP has reached to OPEN state
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*/
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static void
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IpcpLayerUp(fp)
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struct fsm *fp;
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{
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char tbuff[100];
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Prompt();
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LogPrintf(LogLCP, "IpcpLayerUp(%d).\n", fp->state);
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snprintf(tbuff, sizeof(tbuff), "myaddr = %s ",
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inet_ntoa(IpcpInfo.want_ipaddr));
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LogPrintf(LogIsKept(LogLCP) ? LogLCP : LogLINK, " %s hisaddr = %s\n",
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tbuff, inet_ntoa(IpcpInfo.his_ipaddr));
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if (OsSetIpaddress(IpcpInfo.want_ipaddr, IpcpInfo.his_ipaddr, ifnetmask) < 0) {
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if (VarTerm)
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LogPrintf(LogERROR, "IpcpLayerUp: unable to set ip address\n");
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return;
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}
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if (mode & MODE_ALIAS)
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VarSetPacketAliasAddress(IpcpInfo.want_ipaddr);
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OsLinkup();
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IpcpStartReport();
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StartIdleTimer();
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}
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void
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IpcpUp()
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{
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FsmUp(&IpcpFsm);
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LogPrintf(LogLCP, "IPCP Up event!!\n");
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}
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void
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IpcpOpen()
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{
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FsmOpen(&IpcpFsm);
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}
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static int
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AcceptableAddr(prange, ipaddr)
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struct in_range *prange;
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struct in_addr ipaddr;
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{
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LogPrintf(LogDEBUG, "requested = %x ", htonl(ipaddr.s_addr));
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LogPrintf(LogDEBUG, "range = %x", htonl(prange->ipaddr.s_addr));
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LogPrintf(LogDEBUG, "/%x\n", htonl(prange->mask.s_addr));
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LogPrintf(LogDEBUG, "%x, %x\n", htonl(prange->ipaddr.s_addr & prange->
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mask.s_addr), htonl(ipaddr.s_addr & prange->mask.s_addr));
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return (prange->ipaddr.s_addr & prange->mask.s_addr) ==
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(ipaddr.s_addr & prange->mask.s_addr) && ipaddr.s_addr;
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}
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static void
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IpcpDecodeConfig(cp, plen, mode)
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u_char *cp;
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int plen;
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int mode;
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{
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int type, length;
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u_long *lp, compproto;
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struct compreq *pcomp;
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struct in_addr ipaddr, dstipaddr, dnsstuff, ms_info_req;
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char tbuff[100];
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char tbuff2[100];
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ackp = AckBuff;
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nakp = NakBuff;
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rejp = RejBuff;
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while (plen >= sizeof(struct fsmconfig)) {
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if (plen < 0)
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break;
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type = *cp;
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length = cp[1];
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if (type <= TY_IPADDR)
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snprintf(tbuff, sizeof(tbuff), " %s[%d] ", cftypes[type], length);
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else
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snprintf(tbuff, sizeof(tbuff), " ");
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switch (type) {
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case TY_IPADDR: /* RFC1332 */
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lp = (u_long *)(cp + 2);
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ipaddr.s_addr = *lp;
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LogPrintf(LogLCP, "%s %s\n", tbuff, inet_ntoa(ipaddr));
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switch (mode) {
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case MODE_REQ:
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if (!AcceptableAddr(&DefHisAddress, ipaddr)) {
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/*
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* If destination address is not acceptable, insist to use
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* what we want to use.
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*/
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bcopy(cp, nakp, 2);
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bcopy(&IpcpInfo.his_ipaddr.s_addr, nakp+2, length);
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nakp += length;
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break;
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}
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IpcpInfo.his_ipaddr = ipaddr;
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bcopy(cp, ackp, length);
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ackp += length;
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break;
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case MODE_NAK:
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if (AcceptableAddr(&DefMyAddress, ipaddr)) {
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/*
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* Use address suggested by peer.
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*/
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snprintf(tbuff2, sizeof(tbuff2), "%s changing address: %s ", tbuff, inet_ntoa(IpcpInfo.want_ipaddr));
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LogPrintf(LogLCP, "%s --> %s\n", tbuff2, inet_ntoa(ipaddr));
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IpcpInfo.want_ipaddr = ipaddr;
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}
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break;
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case MODE_REJ:
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IpcpInfo.his_reject |= (1 << type);
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break;
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}
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break;
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case TY_COMPPROTO:
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lp = (u_long *)(cp + 2);
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compproto = htonl(*lp);
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LogPrintf(LogLCP, "%s %08x\n", tbuff, compproto);
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switch (mode) {
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case MODE_REQ:
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if (!Acceptable(ConfVjcomp)) {
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bcopy(cp, rejp, length);
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rejp += length;
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} else {
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pcomp = (struct compreq *)(cp + 2);
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switch (length) {
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case 4: /* RFC1172 */
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if (ntohs(pcomp->proto) == PROTO_VJCOMP) {
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LogPrintf(LogWARN, "Peer is speaking RFC1172 compression protocol !\n");
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IpcpInfo.heis1172 = 1;
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IpcpInfo.his_compproto = compproto;
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bcopy(cp, ackp, length);
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ackp += length;
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} else {
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bcopy(cp, nakp, 2);
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pcomp->proto = htons(PROTO_VJCOMP);
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bcopy(&pcomp, nakp + 2, 2);
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nakp += length;
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}
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break;
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case 6: /* RFC1332 */
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if (ntohs(pcomp->proto) == PROTO_VJCOMP
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&& pcomp->slots < MAX_STATES && pcomp->slots > 2) {
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IpcpInfo.his_compproto = compproto;
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IpcpInfo.heis1172 = 0;
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bcopy(cp, ackp, length);
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ackp += length;
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} else {
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bcopy(cp, nakp, 2);
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pcomp->proto = htons(PROTO_VJCOMP);
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pcomp->slots = MAX_STATES - 1;
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pcomp->compcid = 0;
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bcopy(&pcomp, nakp + 2, sizeof(pcomp));
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nakp += length;
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}
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break;
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default:
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bcopy(cp, rejp, length);
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rejp += length;
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break;
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}
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}
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break;
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case MODE_NAK:
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LogPrintf(LogLCP, "%s changing compproto: %08x --> %08x\n",
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tbuff, IpcpInfo.want_compproto, compproto);
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IpcpInfo.want_compproto = compproto;
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break;
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case MODE_REJ:
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IpcpInfo.his_reject |= (1 << type);
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break;
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}
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break;
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case TY_IPADDRS: /* RFC1172 */
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lp = (u_long *)(cp + 2);
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ipaddr.s_addr = *lp;
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lp = (u_long *)(cp + 6);
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dstipaddr.s_addr = *lp;
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LogPrintf(LogLCP, "%s %s, ", tbuff, inet_ntoa(ipaddr));
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LogPrintf(LogLCP, "%s\n", inet_ntoa(dstipaddr));
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|
|
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switch (mode) {
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case MODE_REQ:
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IpcpInfo.his_ipaddr = ipaddr;
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IpcpInfo.want_ipaddr = dstipaddr;
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bcopy(cp, ackp, length);
|
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ackp += length;
|
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break;
|
|
case MODE_NAK:
|
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LogPrintf(LogLCP, "%s changing address: %s ",
|
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tbuff, inet_ntoa(IpcpInfo.want_ipaddr));
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LogPrintf(LogLCP, "--> %s\n", inet_ntoa(ipaddr));
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IpcpInfo.want_ipaddr = ipaddr;
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IpcpInfo.his_ipaddr = dstipaddr;
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break;
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case MODE_REJ:
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IpcpInfo.his_reject |= (1 << type);
|
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break;
|
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}
|
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break;
|
|
|
|
/*
|
|
* MS extensions for MS's PPP
|
|
*/
|
|
|
|
#ifndef NOMSEXT
|
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case TY_PRIMARY_DNS: /* MS PPP DNS negotiation hack */
|
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case TY_SECONDARY_DNS:
|
|
if( !Enabled( ConfMSExt ) ) {
|
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LogPrintf(LogLCP, "MS NS req - rejected - msext disabled\n");
|
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IpcpInfo.my_reject |= ( 1 << type );
|
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bcopy(cp, rejp, length);
|
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rejp += length;
|
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break;
|
|
}
|
|
switch( mode ){
|
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case MODE_REQ:
|
|
lp = (u_long *)(cp + 2);
|
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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 )
|
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{
|
|
/*
|
|
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);
|
|
}
|