638 lines
16 KiB
C
638 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 1.121.2.25 1998/02/17 19:28:29 brian Exp $
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*
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* TODO:
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* o Add commands for traffic summary, version display, etc.
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* o Add signal handler for misc controls.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_tun.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 <arpa/inet.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 <stdlib.h>
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#include <string.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <termios.h>
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#include <unistd.h>
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#include "command.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 "modem.h"
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#include "bundle.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 "ipcp.h"
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#include "loadalias.h"
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#include "vars.h"
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#include "auth.h"
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#include "filter.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 "vjcomp.h"
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#include "async.h"
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#include "pathnames.h"
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#include "tun.h"
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#include "route.h"
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#include "link.h"
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#include "descriptor.h"
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#include "physical.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 "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 pid_t BGPid = 0;
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static char pid_filename[MAXPATHLEN];
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static void DoLoop(struct bundle *);
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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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int CleaningUp;
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void
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Cleanup(int excode)
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{
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CleaningUp = 1;
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if (bundle_Phase(SignalBundle) != PHASE_DEAD)
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bundle_Close(SignalBundle, NULL, 0);
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}
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void
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AbortProgram(int excode)
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{
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prompt_Drop(&prompt, 1);
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ServerClose();
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ID0unlink(pid_filename);
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if (mode & MODE_BACKGROUND && BGFiledes[1] != -1) {
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char c = EX_ERRDEAD;
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if (write(BGFiledes[1], &c, 1) == 1)
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LogPrintf(LogPHASE, "Parent notified of failure.\n");
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else
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LogPrintf(LogPHASE, "Failed to notify parent of failure.\n");
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close(BGFiledes[1]);
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}
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LogPrintf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
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prompt_TtyOldMode(&prompt);
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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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pending_signal(SIGINT, SIG_IGN);
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LogPrintf(LogPHASE, "Caught signal %d, abort connection\n", signo);
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/* XXX close 'em all ! */
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link_Close(bundle2link(SignalBundle, NULL), SignalBundle, 0, 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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if (BGPid) {
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kill(BGPid, SIGINT);
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exit(EX_TERM);
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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 void
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TerminalCont(int signo)
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{
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pending_signal(SIGCONT, SIG_DFL);
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pending_signal(SIGTSTP, TerminalStop);
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prompt_TtyCommandMode(&prompt);
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if (getpgrp() == prompt_pgrp(&prompt))
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prompt_Display(&prompt, SignalBundle);
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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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pending_signal(SIGCONT, TerminalCont);
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prompt_TtyOldMode(&prompt);
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pending_signal(SIGTSTP, SIG_DFL);
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kill(getpid(), signo);
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}
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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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static void
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BringDownServer(int signo)
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{
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VarHaveLocalAuthKey = 0;
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LocalAuthInit();
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ServerClose();
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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)
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{
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int optc;
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char *cp;
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optc = 0;
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mode = MODE_INTER;
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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 |= MODE_AUTO;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "background") == 0) {
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mode |= MODE_BACKGROUND;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "direct") == 0) {
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mode |= MODE_DIRECT;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "dedicated") == 0) {
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mode |= MODE_DEDICATED;
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mode &= ~MODE_INTER;
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} else if (strcmp(cp, "ddial") == 0) {
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mode |= MODE_DDIAL;
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mode &= ~MODE_INTER;
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#ifndef NOALIAS
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} else if (strcmp(cp, "alias") == 0) {
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if (loadAliasHandlers(&VarAliasHandlers) == 0)
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mode |= MODE_ALIAS;
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else
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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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#endif
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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, "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, "specify only one 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;
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struct bundle *bundle;
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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);
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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 & MODE_INTER) {
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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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prompt_Init(&prompt, (mode & MODE_DIRECT) ? PROMPT_NONE : PROMPT_STD);
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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)) {
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fprintf(stderr, "You may not use ppp in this mode with this label\n");
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if (mode & MODE_DIRECT) {
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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 (mode & MODE_INTER)
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VarLocalAuth = LOCAL_AUTH;
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if ((bundle = bundle_Create("/dev/tun")) == 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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if (!GetShortHost())
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return 1;
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IsInteractive(1);
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SignalBundle = bundle;
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if (SelectSystem(bundle, "default", CONFFILE) < 0)
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prompt_Printf(&prompt,
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"Warning: No default entry is given in config file.\n");
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if ((mode & MODE_OUTGOING_DAEMON) && !(mode & MODE_DEDICATED))
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if (label == NULL) {
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prompt_Printf(&prompt, "Destination system must be specified in"
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" auto, background or ddial mode.\n");
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return EX_START;
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}
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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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#ifdef SIGPIPE
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signal(SIGPIPE, SIG_IGN);
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#endif
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#ifdef SIGALRM
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pending_signal(SIGALRM, SIG_IGN);
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#endif
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if (mode & MODE_INTER) {
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#ifdef SIGTSTP
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pending_signal(SIGTSTP, TerminalStop);
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#endif
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#ifdef SIGTTIN
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pending_signal(SIGTTIN, TerminalStop);
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#endif
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#ifdef SIGTTOU
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pending_signal(SIGTTOU, SIG_IGN);
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#endif
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}
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if (!(mode & MODE_INTER)) {
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#ifdef SIGUSR1
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pending_signal(SIGUSR1, SetUpServer);
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#endif
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#ifdef SIGUSR2
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pending_signal(SIGUSR2, BringDownServer);
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#endif
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}
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if (label) {
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if (SelectSystem(bundle, label, CONFFILE) < 0) {
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LogPrintf(LogWARN, "Destination system %s not found in conf file.\n",
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GetLabel());
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Cleanup(EX_START);
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}
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/*
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* We don't SetLabel() 'till now in case SelectSystem() has an
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* embeded load "otherlabel" command.
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*/
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SetLabel(label);
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if (mode & MODE_AUTO &&
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IpcpInfo.DefHisAddress.ipaddr.s_addr == INADDR_ANY) {
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LogPrintf(LogWARN, "You must \"set ifaddr\" in label %s for auto mode.\n",
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label);
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Cleanup(EX_START);
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}
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}
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if (mode & MODE_DAEMON) {
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if (mode & MODE_BACKGROUND) {
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if (pipe(BGFiledes)) {
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LogPrintf(LogERROR, "pipe: %s\n", strerror(errno));
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Cleanup(EX_SOCK);
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}
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}
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if (!(mode & MODE_DIRECT)) {
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pid_t bgpid;
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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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Cleanup(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 & MODE_BACKGROUND) {
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/* Wait for our child to close its pipe before we exit. */
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BGPid = bgpid;
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close(BGFiledes[1]);
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if (read(BGFiledes[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(BGFiledes[0]);
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}
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return c;
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} else if (mode & MODE_BACKGROUND)
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close(BGFiledes[0]);
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}
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prompt_Init(&prompt, PROMPT_NONE);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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if (mode & MODE_DIRECT)
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/* STDIN_FILENO gets used by modem_Open in DIRECT mode */
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prompt_TtyInit(&prompt, PROMPT_DONT_WANT_INT);
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else if (mode & MODE_DAEMON) {
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setsid();
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close(STDIN_FILENO);
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}
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} else {
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close(STDERR_FILENO);
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prompt_TtyInit(&prompt, PROMPT_WANT_INT);
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prompt_TtyCommandMode(&prompt);
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prompt_Display(&prompt, bundle);
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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.\n");
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do
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DoLoop(bundle);
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while (mode & MODE_DEDICATED);
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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)
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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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#define rbuff tun.data
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if (mode & (MODE_DIRECT|MODE_DEDICATED|MODE_BACKGROUND))
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bundle_Open(bundle, NULL);
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while (!CleaningUp || bundle_Phase(SignalBundle) != PHASE_DEAD) {
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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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bundle_UpdateSet(bundle, &rfds, &wfds, &efds, &nfds);
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descriptor_UpdateSet(&server.desc, &rfds, &wfds, &efds, &nfds);
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#ifndef SIGALRM
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/*
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* *** IMPORTANT ***
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* CPU is serviced every TICKUNIT micro seconds. This value must be chosen
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* with great care. If this values is too big, it results in loss of
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* characters from the modem and poor response. If this value is too
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* small, ppp eats too much CPU time.
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*/
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usleep(TICKUNIT);
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TimerService();
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#endif
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|
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/* If there are aren't many packets queued, look for some more. */
|
|
if (qlen < 20 && bundle->tun_fd >= 0) {
|
|
if (bundle->tun_fd + 1 > nfds)
|
|
nfds = bundle->tun_fd + 1;
|
|
FD_SET(bundle->tun_fd, &rfds);
|
|
}
|
|
|
|
descriptor_UpdateSet(&prompt.desc, &rfds, &wfds, &efds, &nfds);
|
|
|
|
i = select(nfds, &rfds, &wfds, &efds, NULL);
|
|
|
|
if (i == 0)
|
|
continue;
|
|
|
|
if (i < 0) {
|
|
if (errno == EINTR) {
|
|
handle_signals();
|
|
continue;
|
|
}
|
|
LogPrintf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i <= nfds; i++)
|
|
if (FD_ISSET(i, &efds)) {
|
|
LogPrintf(LogALERT, "Exception detected on descriptor %d\n", i);
|
|
break;
|
|
}
|
|
|
|
if (descriptor_IsSet(&server.desc, &rfds))
|
|
descriptor_Read(&server.desc, bundle, &rfds);
|
|
|
|
if (descriptor_IsSet(&prompt.desc, &rfds))
|
|
descriptor_Read(&prompt.desc, bundle, &rfds);
|
|
|
|
/* XXX FIX ME ! */
|
|
if (descriptor_IsSet(&bundle2datalink(bundle, NULL)->desc, &wfds))
|
|
descriptor_Write(&bundle2datalink(bundle, NULL)->desc, &wfds);
|
|
if (descriptor_IsSet(&bundle2datalink(bundle, NULL)->desc, &rfds))
|
|
descriptor_Read(&bundle2datalink(bundle, NULL)->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 *) rbuff)->ip_dst.s_addr == IpcpInfo.want_ipaddr.s_addr) {
|
|
/* we've been asked to send something addressed *to* us :( */
|
|
if (VarLoopback) {
|
|
pri = PacketCheck(rbuff, n, FL_IN);
|
|
if (pri >= 0) {
|
|
struct mbuf *bp;
|
|
|
|
#ifndef NOALIAS
|
|
if (mode & MODE_ALIAS) {
|
|
VarPacketAliasIn(rbuff, sizeof rbuff);
|
|
n = ntohs(((struct ip *) rbuff)->ip_len);
|
|
}
|
|
#endif
|
|
bp = mballoc(n, MB_IPIN);
|
|
memcpy(MBUF_CTOP(bp), rbuff, 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 (LcpInfo.fsm.state <= ST_CLOSED && (mode & MODE_AUTO) &&
|
|
(pri = PacketCheck(rbuff, n, FL_DIAL)) >= 0)
|
|
bundle_Open(bundle, NULL);
|
|
|
|
pri = PacketCheck(rbuff, n, FL_OUT);
|
|
if (pri >= 0) {
|
|
#ifndef NOALIAS
|
|
if (mode & MODE_ALIAS) {
|
|
VarPacketAliasOut(rbuff, sizeof rbuff);
|
|
n = ntohs(((struct ip *) rbuff)->ip_len);
|
|
}
|
|
#endif
|
|
IpEnqueue(pri, rbuff, n);
|
|
}
|
|
}
|
|
}
|
|
LogPrintf(LogDEBUG, "Job (DoLoop) done.\n");
|
|
}
|