616 lines
16 KiB
C
616 lines
16 KiB
C
/*
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* User Process PPP
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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: main.c,v 1.121.2.49 1998/04/16 00:26:08 brian Exp $
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*
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* TODO:
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*/
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "mbuf.h"
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#include "log.h"
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#include "defs.h"
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#include "id.h"
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#include "timer.h"
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#include "fsm.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "iplist.h"
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#include "throughput.h"
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#include "slcompress.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "descriptor.h"
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#include "link.h"
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#include "mp.h"
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#include "bundle.h"
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#include "loadalias.h"
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#include "auth.h"
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#include "systems.h"
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#include "ip.h"
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#include "sig.h"
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#include "main.h"
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#include "pathnames.h"
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#include "tun.h"
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#include "server.h"
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#include "prompt.h"
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#include "chat.h"
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#include "chap.h"
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#include "datalink.h"
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#ifndef O_NONBLOCK
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#ifdef O_NDELAY
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#define O_NONBLOCK O_NDELAY
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#endif
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#endif
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static char pid_filename[MAXPATHLEN];
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static void DoLoop(struct bundle *, struct prompt *);
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static void TerminalStop(int);
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static const char *ex_desc(int);
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static struct bundle *SignalBundle;
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static struct prompt *SignalPrompt;
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void
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Cleanup(int excode)
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{
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SignalBundle->CleaningUp = 1;
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if (bundle_Phase(SignalBundle) != PHASE_DEAD)
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bundle_Close(SignalBundle, NULL, 1);
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}
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void
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AbortProgram(int excode)
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{
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ServerClose(SignalBundle);
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ID0unlink(pid_filename);
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LogPrintf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
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bundle_Close(SignalBundle, NULL, 1);
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bundle_Destroy(SignalBundle);
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LogClose();
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exit(excode);
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}
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static void
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CloseConnection(int signo)
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{
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/* NOTE, these are manual, we've done a setsid() */
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struct datalink *dl;
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pending_signal(SIGINT, SIG_IGN);
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LogPrintf(LogPHASE, "Caught signal %d, abort connection(s)\n", signo);
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for (dl = SignalBundle->links; dl; dl = dl->next)
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datalink_Down(dl, 1);
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pending_signal(SIGINT, CloseConnection);
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}
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static void
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CloseSession(int signo)
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{
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LogPrintf(LogPHASE, "Signal %d, terminate.\n", signo);
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Cleanup(EX_TERM);
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}
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static pid_t BGPid = 0;
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static void
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KillChild(int signo)
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{
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LogPrintf(LogPHASE, "Parent: Signal %d\n", signo);
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kill(BGPid, SIGINT);
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}
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static void
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TerminalCont(int signo)
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{
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signal(SIGCONT, SIG_DFL);
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prompt_Continue(SignalPrompt);
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}
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static void
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TerminalStop(int signo)
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{
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prompt_Suspend(SignalPrompt);
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signal(SIGCONT, TerminalCont);
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raise(SIGSTOP);
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}
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#if 0 /* What's our passwd :-O */
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static void
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SetUpServer(int signo)
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{
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int res;
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VarHaveLocalAuthKey = 0;
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LocalAuthInit();
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if ((res = ServerTcpOpen(SERVER_PORT + SignalBundle->unit)) != 0)
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LogPrintf(LogERROR, "SIGUSR1: Failed %d to open port %d\n",
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res, SERVER_PORT + SignalBundle->unit);
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}
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#endif
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static void
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BringDownServer(int signo)
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{
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/* Drops all child prompts too ! */
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ServerClose(SignalBundle);
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}
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static const char *
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ex_desc(int ex)
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{
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static char num[12];
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static const char *desc[] = {
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"normal", "start", "sock", "modem", "dial", "dead", "done",
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"reboot", "errdead", "hangup", "term", "nodial", "nologin"
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};
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if (ex >= 0 && ex < sizeof desc / sizeof *desc)
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return desc[ex];
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snprintf(num, sizeof num, "%d", ex);
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return num;
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}
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static void
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Usage(void)
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{
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fprintf(stderr,
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"Usage: ppp [-auto | -background | -direct | -dedicated | -ddial ]"
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#ifndef NOALIAS
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" [ -alias ]"
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#endif
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" [system]\n");
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exit(EX_START);
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}
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static char *
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ProcessArgs(int argc, char **argv, int *mode)
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{
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int optc, labelrequired;
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char *cp;
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optc = labelrequired = 0;
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*mode = PHYS_MANUAL;
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while (argc > 0 && **argv == '-') {
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cp = *argv + 1;
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if (strcmp(cp, "auto") == 0) {
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*mode = PHYS_DEMAND;
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labelrequired = 1;
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} else if (strcmp(cp, "background") == 0) {
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*mode = PHYS_1OFF;
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labelrequired = 1;
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} else if (strcmp(cp, "direct") == 0)
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*mode = PHYS_STDIN;
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else if (strcmp(cp, "dedicated") == 0)
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*mode = PHYS_DEDICATED;
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else if (strcmp(cp, "ddial") == 0) {
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*mode = PHYS_PERM;
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labelrequired = 1;
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} else if (strcmp(cp, "alias") == 0) {
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#ifndef NOALIAS
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if (loadAliasHandlers() != 0)
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#endif
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LogPrintf(LogWARN, "Cannot load alias library\n");
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optc--; /* this option isn't exclusive */
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} else
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Usage();
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optc++;
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argv++;
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argc--;
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}
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if (argc > 1) {
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fprintf(stderr, "You may specify only one system label.\n");
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exit(EX_START);
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}
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if (optc > 1) {
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fprintf(stderr, "You may specify only one mode.\n");
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exit(EX_START);
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}
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if (labelrequired && argc != 1) {
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fprintf(stderr, "Destination system must be specified in"
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" auto, background or ddial mode.\n");
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exit(EX_START);
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}
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return argc == 1 ? *argv : NULL; /* Don't SetLabel yet ! */
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}
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int
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main(int argc, char **argv)
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{
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FILE *lockfile;
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char *name, *label;
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int nfds, mode;
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struct bundle *bundle;
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struct prompt *prompt;
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nfds = getdtablesize();
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if (nfds >= FD_SETSIZE)
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/*
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* If we've got loads of file descriptors, make sure they're all
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* closed. If they aren't, we may end up with a seg fault when our
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* `fd_set's get too big when select()ing !
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*/
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while (--nfds > 2)
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close(nfds);
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name = strrchr(argv[0], '/');
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LogOpen(name ? name + 1 : argv[0]);
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argc--;
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argv++;
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label = ProcessArgs(argc, argv, &mode);
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#ifdef __FreeBSD__
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/*
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* A FreeBSD hack to dodge a bug in the tty driver that drops output
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* occasionally.... I must find the real reason some time. To display
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* the dodgy behaviour, comment out this bit, make yourself a large
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* routing table and then run ppp in interactive mode. The `show route'
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* command will drop chunks of data !!!
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*/
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if (mode == PHYS_MANUAL) {
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close(STDIN_FILENO);
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if (open(_PATH_TTY, O_RDONLY) != STDIN_FILENO) {
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fprintf(stderr, "Cannot open %s for input !\n", _PATH_TTY);
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return 2;
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}
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}
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#endif
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/* Allow output for the moment (except in direct mode) */
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if (mode == PHYS_STDIN)
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prompt = NULL;
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else {
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const char *m;
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SignalPrompt = prompt = prompt_Create(NULL, NULL, PROMPT_STD);
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if (mode == PHYS_PERM)
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m = "direct dial";
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else if (mode & PHYS_1OFF)
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m = "background";
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else if (mode & PHYS_DEMAND)
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m = "auto";
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else if (mode & PHYS_DEDICATED)
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m = "dedicated";
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else if (mode & PHYS_MANUAL)
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m = "interactive";
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else
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m = NULL;
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if (m)
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prompt_Printf(prompt, "Working in %s mode\n", m);
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}
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ID0init();
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if (ID0realuid() != 0) {
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char conf[200], *ptr;
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snprintf(conf, sizeof conf, "%s/%s", _PATH_PPP, CONFFILE);
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do {
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if (!access(conf, W_OK)) {
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LogPrintf(LogALERT, "ppp: Access violation: Please protect %s\n", conf);
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return -1;
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}
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ptr = conf + strlen(conf)-2;
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while (ptr > conf && *ptr != '/')
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*ptr-- = '\0';
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} while (ptr >= conf);
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}
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if (!ValidSystem(label, prompt, mode)) {
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fprintf(stderr, "You may not use ppp in this mode with this label\n");
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if (mode == PHYS_STDIN) {
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const char *l;
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l = label ? label : "default";
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LogPrintf(LogWARN, "Label %s rejected -direct connection\n", l);
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}
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LogClose();
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return 1;
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}
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if ((bundle = bundle_Create(TUN_PREFIX, prompt, mode)) == NULL) {
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LogPrintf(LogWARN, "bundle_Create: %s\n", strerror(errno));
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return EX_START;
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}
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SignalBundle = bundle;
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if (SelectSystem(bundle, "default", CONFFILE, prompt) < 0)
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prompt_Printf(prompt, "Warning: No default entry found in config file.\n");
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pending_signal(SIGHUP, CloseSession);
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pending_signal(SIGTERM, CloseSession);
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pending_signal(SIGINT, CloseConnection);
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pending_signal(SIGQUIT, CloseSession);
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pending_signal(SIGALRM, SIG_IGN);
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signal(SIGPIPE, SIG_IGN);
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if (mode == PHYS_MANUAL)
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pending_signal(SIGTSTP, TerminalStop);
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#if 0 /* What's our passwd :-O */
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pending_signal(SIGUSR1, SetUpServer);
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#endif
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pending_signal(SIGUSR2, BringDownServer);
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if (label) {
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/*
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* Set label both before and after SelectSystem !
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* This way, "set enddisc label" works during SelectSystem, and we
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* also end up with the correct label if we have embedded load
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* commands.
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*/
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bundle_SetLabel(bundle, label);
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if (SelectSystem(bundle, label, CONFFILE, prompt) < 0) {
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prompt_Printf(prompt, "Destination system (%s) not found.\n", label);
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AbortProgram(EX_START);
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}
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bundle_SetLabel(bundle, label);
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if (mode == PHYS_DEMAND &&
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bundle->ncp.ipcp.cfg.peer_range.ipaddr.s_addr == INADDR_ANY) {
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prompt_Printf(prompt, "You must \"set ifaddr\" with a peer address "
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"in label %s for auto mode.\n", label);
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AbortProgram(EX_START);
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}
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}
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if (mode != PHYS_MANUAL) {
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if (mode != PHYS_STDIN) {
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int bgpipe[2];
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pid_t bgpid;
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if (mode == PHYS_1OFF && pipe(bgpipe)) {
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LogPrintf(LogERROR, "pipe: %s\n", strerror(errno));
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AbortProgram(EX_SOCK);
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}
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bgpid = fork();
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if (bgpid == -1) {
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LogPrintf(LogERROR, "fork: %s\n", strerror(errno));
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AbortProgram(EX_SOCK);
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}
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if (bgpid) {
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char c = EX_NORMAL;
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if (mode == PHYS_1OFF) {
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close(bgpipe[1]);
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BGPid = bgpid;
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/* If we get a signal, kill the child */
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signal(SIGHUP, KillChild);
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signal(SIGTERM, KillChild);
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signal(SIGINT, KillChild);
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signal(SIGQUIT, KillChild);
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/* Wait for our child to close its pipe before we exit */
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if (read(bgpipe[0], &c, 1) != 1) {
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prompt_Printf(prompt, "Child exit, no status.\n");
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LogPrintf(LogPHASE, "Parent: Child exit, no status.\n");
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} else if (c == EX_NORMAL) {
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prompt_Printf(prompt, "PPP enabled.\n");
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LogPrintf(LogPHASE, "Parent: PPP enabled.\n");
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} else {
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prompt_Printf(prompt, "Child failed (%s).\n", ex_desc((int) c));
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LogPrintf(LogPHASE, "Parent: Child failed (%s).\n",
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ex_desc((int) c));
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}
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close(bgpipe[0]);
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}
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return c;
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} else if (mode == PHYS_1OFF) {
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close(bgpipe[0]);
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bundle->notify.fd = bgpipe[1];
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}
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/* -auto, -dedicated, -ddial & -background */
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prompt_Destroy(prompt, 0);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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close(STDIN_FILENO);
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setsid();
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} else {
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/* -direct: STDIN_FILENO gets used by modem_Open */
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prompt_TtyInit(NULL);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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}
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} else {
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/* Interactive mode */
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close(STDERR_FILENO);
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prompt_TtyInit(prompt);
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prompt_TtyCommandMode(prompt);
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prompt_Required(prompt);
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}
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snprintf(pid_filename, sizeof pid_filename, "%stun%d.pid",
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_PATH_VARRUN, bundle->unit);
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lockfile = ID0fopen(pid_filename, "w");
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if (lockfile != NULL) {
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fprintf(lockfile, "%d\n", (int) getpid());
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fclose(lockfile);
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}
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#ifndef RELEASE_CRUNCH
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else
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LogPrintf(LogALERT, "Warning: Can't create %s: %s\n",
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pid_filename, strerror(errno));
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#endif
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LogPrintf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(mode));
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DoLoop(bundle, prompt);
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AbortProgram(EX_NORMAL);
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return EX_NORMAL;
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}
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static void
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DoLoop(struct bundle *bundle, struct prompt *prompt)
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{
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fd_set rfds, wfds, efds;
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int pri, i, n, nfds;
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int qlen;
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struct tun_data tun;
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do {
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nfds = 0;
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FD_ZERO(&rfds);
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FD_ZERO(&wfds);
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FD_ZERO(&efds);
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qlen = bundle_FillQueues(bundle);
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handle_signals();
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descriptor_UpdateSet(&bundle->desc, &rfds, &wfds, &efds, &nfds);
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descriptor_UpdateSet(&server.desc, &rfds, &wfds, &efds, &nfds);
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/* If there are aren't many packets queued, look for some more. */
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if (qlen < 20 && bundle->tun_fd >= 0) {
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if (bundle->tun_fd + 1 > nfds)
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nfds = bundle->tun_fd + 1;
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FD_SET(bundle->tun_fd, &rfds);
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}
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if (bundle_IsDead(bundle))
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/* Don't select - we'll be here forever */
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break;
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i = select(nfds, &rfds, &wfds, &efds, NULL);
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if (i == 0)
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continue;
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if (i < 0) {
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if (errno == EINTR) {
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handle_signals();
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continue;
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}
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LogPrintf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
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break;
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}
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for (i = 0; i <= nfds; i++)
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if (FD_ISSET(i, &efds)) {
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LogPrintf(LogALERT, "Exception detected on descriptor %d\n", i);
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break;
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}
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if (descriptor_IsSet(&server.desc, &rfds))
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descriptor_Read(&server.desc, bundle, &rfds);
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if (descriptor_IsSet(&bundle->desc, &wfds))
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descriptor_Write(&bundle->desc, bundle, &wfds);
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|
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if (descriptor_IsSet(&bundle->desc, &rfds))
|
|
descriptor_Read(&bundle->desc, bundle, &rfds);
|
|
|
|
if (bundle->tun_fd >= 0 && FD_ISSET(bundle->tun_fd, &rfds)) {
|
|
/* something to read from tun */
|
|
n = read(bundle->tun_fd, &tun, sizeof tun);
|
|
if (n < 0) {
|
|
LogPrintf(LogERROR, "read from tun: %s\n", strerror(errno));
|
|
continue;
|
|
}
|
|
n -= sizeof tun - sizeof tun.data;
|
|
if (n <= 0) {
|
|
LogPrintf(LogERROR, "read from tun: Only %d bytes read\n", n);
|
|
continue;
|
|
}
|
|
if (!tun_check_header(tun, AF_INET))
|
|
continue;
|
|
if (((struct ip *)tun.data)->ip_dst.s_addr ==
|
|
bundle->ncp.ipcp.my_ip.s_addr) {
|
|
/* we've been asked to send something addressed *to* us :( */
|
|
if (Enabled(bundle, OPT_LOOPBACK)) {
|
|
pri = PacketCheck(bundle, tun.data, n, &bundle->filter.in);
|
|
if (pri >= 0) {
|
|
struct mbuf *bp;
|
|
|
|
#ifndef NOALIAS
|
|
if (AliasEnabled()) {
|
|
(*PacketAlias.In)(tun.data, sizeof tun.data);
|
|
n = ntohs(((struct ip *)tun.data)->ip_len);
|
|
}
|
|
#endif
|
|
bp = mballoc(n, MB_IPIN);
|
|
memcpy(MBUF_CTOP(bp), tun.data, n);
|
|
IpInput(bundle, bp);
|
|
LogPrintf(LogDEBUG, "Looped back packet addressed to myself\n");
|
|
}
|
|
continue;
|
|
} else
|
|
LogPrintf(LogDEBUG, "Oops - forwarding packet addressed to myself\n");
|
|
}
|
|
|
|
/*
|
|
* Process on-demand dialup. Output packets are queued within tunnel
|
|
* device until IPCP is opened.
|
|
*/
|
|
if (bundle_Phase(bundle) == PHASE_DEAD)
|
|
/*
|
|
* Note, we must be in AUTO mode :-/ otherwise our interface should
|
|
* *not* be UP and we can't receive data
|
|
*/
|
|
if ((pri = PacketCheck(bundle, tun.data, n, &bundle->filter.dial)) >= 0)
|
|
bundle_Open(bundle, NULL, PHYS_DEMAND);
|
|
else
|
|
/*
|
|
* Drop the packet. If we were to queue it, we'd just end up with
|
|
* a pile of timed-out data in our output queue by the time we get
|
|
* around to actually dialing. We'd also prematurely reach the
|
|
* threshold at which we stop select()ing to read() the tun
|
|
* device - breaking auto-dial.
|
|
*/
|
|
continue;
|
|
|
|
pri = PacketCheck(bundle, tun.data, n, &bundle->filter.out);
|
|
if (pri >= 0) {
|
|
#ifndef NOALIAS
|
|
if (AliasEnabled()) {
|
|
(*PacketAlias.Out)(tun.data, sizeof tun.data);
|
|
n = ntohs(((struct ip *)tun.data)->ip_len);
|
|
}
|
|
#endif
|
|
IpEnqueue(pri, tun.data, n);
|
|
}
|
|
}
|
|
} while (bundle_CleanDatalinks(bundle), !bundle_IsDead(bundle));
|
|
|
|
LogPrintf(LogDEBUG, "DoLoop done.\n");
|
|
}
|