4435d086fa
input routines and take advantage of the new init/continue
interface in libradius. This allows a timely response on
other links in an MP setup while RADIUS requests are in
progress as well as the ability to handle other data from
the peer in parallel. It should also make the future addition
of PAM support trivial.
While I'm in there, validate pap & chap header IDs if
``idcheck'' is enabled (the default) for other FSM packet
types.
NOTE: This involved integrating the generation of chap
challenges and the validation of chap responses
(and commenting what's going on in those routines).
I currently have no way of testing ppps ability
to respond to M$Chap CHALLENGEs correctly, so if
someone could do the honours, it'd be much
appreciated (it *looks* ok!).
Sponsored by: Internet Business Solutions Ltd., Switzerland
570 lines
14 KiB
C
570 lines
14 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 1.149 1999/02/02 09:35:29 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 <sys/time.h>
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#include <termios.h>
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#include <unistd.h>
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#ifndef NOALIAS
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#ifdef __OpenBSD__
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#include "alias.h"
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#else
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#include <alias.h>
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#endif
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#endif
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#include "probe.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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#ifndef NORADIUS
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#include "radius.h"
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#endif
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#include "bundle.h"
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#include "auth.h"
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#include "systems.h"
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#include "sig.h"
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#include "main.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 "cbcp.h"
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#include "datalink.h"
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#include "iface.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 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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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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bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
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}
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void
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AbortProgram(int excode)
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{
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server_Close(SignalBundle);
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log_Printf(LogPHASE, "PPP Terminated (%s).\n", ex_desc(excode));
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bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
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bundle_Destroy(SignalBundle);
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log_Close();
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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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sig_signal(SIGINT, SIG_IGN);
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log_Printf(LogPHASE, "Caught signal %d, abort connection(s)\n", signo);
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bundle_Down(SignalBundle, CLOSE_STAYDOWN);
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sig_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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log_Printf(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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log_Printf(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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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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server_Close(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]; /* Used immediately if returned */
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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 int
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ProcessArgs(int argc, char **argv, int *mode, int *alias)
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{
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int optc, newmode, arg;
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char *cp;
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optc = 0;
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*mode = PHYS_INTERACTIVE;
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*alias = 0;
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for (arg = 1; arg < argc && *argv[arg] == '-'; arg++, optc++) {
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cp = argv[arg] + 1;
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newmode = Nam2mode(cp);
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switch (newmode) {
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case PHYS_NONE:
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if (strcmp(cp, "alias") == 0) {
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#ifdef NOALIAS
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log_Printf(LogWARN, "Cannot load alias library (compiled out)\n");
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#else
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*alias = 1;
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#endif
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optc--; /* this option isn't exclusive */
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} else
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Usage();
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break;
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case PHYS_ALL:
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Usage();
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break;
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default:
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*mode = newmode;
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}
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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 (*mode == PHYS_AUTO && arg == argc) {
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fprintf(stderr, "A system must be specified in auto mode.\n");
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exit(EX_START);
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}
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return arg; /* Don't SetLabel yet ! */
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}
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static void
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CheckLabel(const char *label, struct prompt *prompt, int mode)
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{
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const char *err;
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if ((err = system_IsValid(label, prompt, mode)) != NULL) {
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fprintf(stderr, "%s: %s\n", label, err);
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if (mode == PHYS_DIRECT)
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log_Printf(LogWARN, "Label %s rejected -direct connection: %s\n",
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label, err);
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log_Close();
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exit(1);
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}
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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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char *name;
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const char *lastlabel;
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int nfds, mode, alias, label, arg;
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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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log_Open(name ? name + 1 : argv[0]);
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#ifndef NOALIAS
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PacketAliasInit();
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#endif
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label = ProcessArgs(argc, argv, &mode, &alias);
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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_INTERACTIVE) {
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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_DIRECT)
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prompt = NULL;
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else
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SignalPrompt = prompt = prompt_Create(NULL, NULL, 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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log_Printf(LogALERT, "ppp: Access violation: Please protect %s\n",
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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 (label < argc)
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for (arg = label; arg < argc; arg++)
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CheckLabel(argv[arg], prompt, mode);
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else
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CheckLabel("default", prompt, mode);
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prompt_Printf(prompt, "Working in %s mode\n", mode2Nam(mode));
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if ((bundle = bundle_Create(TUN_PREFIX, mode, (const char **)argv)) == NULL) {
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log_Printf(LogWARN, "bundle_Create: %s\n", strerror(errno));
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return EX_START;
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}
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/* NOTE: We may now have changed argv[1] via a ``set proctitle'' */
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if (prompt) {
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prompt->bundle = bundle; /* couldn't do it earlier */
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prompt_Printf(prompt, "Using interface: %s\n", bundle->iface->name);
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}
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SignalBundle = bundle;
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bundle->AliasEnabled = alias;
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if (alias)
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bundle->cfg.opt |= OPT_IFACEALIAS;
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if (system_Select(bundle, "default", CONFFILE, prompt, NULL) < 0)
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prompt_Printf(prompt, "Warning: No default entry found in config file.\n");
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sig_signal(SIGHUP, CloseSession);
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sig_signal(SIGTERM, CloseSession);
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sig_signal(SIGINT, CloseConnection);
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sig_signal(SIGQUIT, CloseSession);
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sig_signal(SIGALRM, SIG_IGN);
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signal(SIGPIPE, SIG_IGN);
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if (mode == PHYS_INTERACTIVE)
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sig_signal(SIGTSTP, TerminalStop);
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sig_signal(SIGUSR2, BringDownServer);
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lastlabel = argc == 2 ? bundle->argv1 : argv[argc - 1];
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for (arg = label; arg < argc; arg++) {
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/* In case we use LABEL or ``set enddisc label'' */
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bundle_SetLabel(bundle, lastlabel);
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system_Select(bundle, arg == 1 ? bundle->argv1 : argv[arg],
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CONFFILE, prompt, NULL);
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}
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if (label < argc)
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/* In case the last label did a ``load'' */
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bundle_SetLabel(bundle, lastlabel);
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if (mode == PHYS_AUTO &&
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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 auto mode.\n");
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AbortProgram(EX_START);
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}
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if (mode != PHYS_INTERACTIVE) {
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if (mode != PHYS_DIRECT) {
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int bgpipe[2];
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pid_t bgpid;
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if (mode == PHYS_BACKGROUND && pipe(bgpipe)) {
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log_Printf(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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log_Printf(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_BACKGROUND) {
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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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log_Printf(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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log_Printf(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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log_Printf(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_BACKGROUND) {
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close(bgpipe[0]);
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bundle->notify.fd = bgpipe[1];
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}
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bundle_LockTun(bundle); /* we have a new pid */
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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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log_Printf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(mode));
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DoLoop(bundle);
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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 i, nfds, nothing_done;
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struct probe probe;
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probe_Init(&probe);
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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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/* All our datalinks, the tun device and the MP socket */
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descriptor_UpdateSet(&bundle->desc, &rfds, &wfds, &efds, &nfds);
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/* All our prompts and the diagnostic socket */
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descriptor_UpdateSet(&server.desc, &rfds, NULL, NULL, &nfds);
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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 && errno != EINTR) {
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log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
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if (log_IsKept(LogTIMER)) {
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struct timeval t;
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for (i = 0; i <= nfds; i++) {
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if (FD_ISSET(i, &rfds)) {
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log_Printf(LogTIMER, "Read set contains %d\n", i);
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FD_CLR(i, &rfds);
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t.tv_sec = t.tv_usec = 0;
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if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
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log_Printf(LogTIMER, "The culprit !\n");
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break;
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}
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}
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if (FD_ISSET(i, &wfds)) {
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log_Printf(LogTIMER, "Write set contains %d\n", i);
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FD_CLR(i, &wfds);
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t.tv_sec = t.tv_usec = 0;
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if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
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log_Printf(LogTIMER, "The culprit !\n");
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break;
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}
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}
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if (FD_ISSET(i, &efds)) {
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log_Printf(LogTIMER, "Error set contains %d\n", i);
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FD_CLR(i, &efds);
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t.tv_sec = t.tv_usec = 0;
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if (select(nfds, &rfds, &wfds, &efds, &t) != -1) {
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log_Printf(LogTIMER, "The culprit !\n");
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break;
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}
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}
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}
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}
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break;
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}
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log_Printf(LogTIMER, "Select returns %d\n", i);
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sig_Handle();
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if (i <= 0)
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continue;
|
|
|
|
for (i = 0; i <= nfds; i++)
|
|
if (FD_ISSET(i, &efds)) {
|
|
log_Printf(LogPHASE, "Exception detected on descriptor %d\n", i);
|
|
/* We deal gracefully with link descriptor exceptions */
|
|
if (!bundle_Exception(bundle, i)) {
|
|
log_Printf(LogERROR, "Exception cannot be handled !\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (i <= nfds)
|
|
break;
|
|
|
|
nothing_done = 1;
|
|
|
|
if (descriptor_IsSet(&server.desc, &rfds)) {
|
|
descriptor_Read(&server.desc, bundle, &rfds);
|
|
nothing_done = 0;
|
|
}
|
|
|
|
if (descriptor_IsSet(&bundle->desc, &rfds)) {
|
|
descriptor_Read(&bundle->desc, bundle, &rfds);
|
|
nothing_done = 0;
|
|
}
|
|
|
|
if (descriptor_IsSet(&bundle->desc, &wfds))
|
|
if (!descriptor_Write(&bundle->desc, bundle, &wfds) && nothing_done) {
|
|
/*
|
|
* This is disasterous. The OS has told us that something is
|
|
* writable, and all our write()s have failed. Rather than
|
|
* going back immediately to do our UpdateSet()s and select(),
|
|
* we sleep for a bit to avoid gobbling up all cpu time.
|
|
*/
|
|
struct timeval t;
|
|
|
|
t.tv_sec = 0;
|
|
t.tv_usec = 100000;
|
|
select(0, NULL, NULL, NULL, &t);
|
|
}
|
|
|
|
} while (bundle_CleanDatalinks(bundle), !bundle_IsDead(bundle));
|
|
|
|
log_Printf(LogDEBUG, "DoLoop done.\n");
|
|
}
|