887ff31f06
create stdin and stdout, don't blindly try to use stdin as a bi-directional channel. Instead, detect the pipe and set up a special exec handler that indirects write() calls through stdout. This fixes the problem where ``set device "!ssh -e none host ppp -direct label"'' no longer works with an openssh-5.2 server side as that version of openssh ignores the USE_PIPES config setting and *always* uses pipes (rather than socketpair) for stdin/stdout channels. MFC after: 3 days
680 lines
18 KiB
C
680 lines
18 KiB
C
/*-
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* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
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* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
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* Internet Initiative Japan, Inc (IIJ)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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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 <sys/socket.h>
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#include <net/route.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 <stdarg.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 <termios.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#ifndef NONAT
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#ifdef LOCALNAT
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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 "layer.h"
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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 "ncpaddr.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 "ipv6cp.h"
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#include "ncp.h"
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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 struct bundle *SignalBundle;
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static struct prompt *SignalPrompt;
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struct libalias *la;
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void
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Cleanup()
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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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if (SignalBundle)
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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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if (SignalBundle) {
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bundle_Close(SignalBundle, NULL, CLOSE_STAYDOWN);
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bundle_Destroy(SignalBundle);
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}
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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();
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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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signal(signo, SIG_IGN);
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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 __unused)
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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 __unused)
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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 __unused)
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{
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/* Drops all child prompts too ! */
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if (server_Close(SignalBundle))
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log_Printf(LogPHASE, "Closed server socket\n");
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}
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static void
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RestartServer(int signo __unused)
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{
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/* Drops all child prompts and re-opens the socket */
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server_Reopen(SignalBundle);
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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, "usage: ppp [-auto | -foreground | -background | -direct |"
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" -dedicated | -ddial | -interactive]"
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#ifndef NONAT
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" [-nat]"
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#endif
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" [-quiet] [-unit N] [system ...]\n");
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exit(EX_START);
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}
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struct switches {
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unsigned nat : 1;
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unsigned fg : 1;
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unsigned quiet : 1;
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int mode;
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int unit;
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};
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static int
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ProcessArgs(int argc, char **argv, struct switches *sw)
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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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memset(sw, '\0', sizeof *sw);
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sw->mode = PHYS_INTERACTIVE;
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sw->unit = -1;
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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, "nat") == 0) {
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#ifdef NONAT
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log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
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#else
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sw->nat = 1;
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#endif
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optc--; /* this option isn't exclusive */
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} else if (strcmp(cp, "alias") == 0) {
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#ifdef NONAT
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log_Printf(LogWARN, "%s ignored: NAT is compiled out\n", argv[arg]);
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fprintf(stderr, "%s ignored: NAT is compiled out\n", argv[arg]);
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#else
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log_Printf(LogWARN, "%s is deprecated\n", argv[arg]);
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fprintf(stderr, "%s is deprecated\n", argv[arg]);
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sw->nat = 1;
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#endif
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optc--; /* this option isn't exclusive */
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} else if (strncmp(cp, "unit", 4) == 0) {
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optc--; /* this option isn't exclusive */
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if (cp[4] == '\0') {
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optc--; /* nor is the argument */
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if (++arg == argc) {
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fprintf(stderr, "-unit: Expected unit number\n");
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Usage();
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} else
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sw->unit = atoi(argv[arg]);
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} else
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sw->unit = atoi(cp + 4);
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} else if (strcmp(cp, "quiet") == 0) {
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sw->quiet = 1;
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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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sw->mode = newmode;
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if (newmode == PHYS_FOREGROUND)
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sw->fg = 1;
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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 (sw->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 arg, holdfd[3], label;
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unsigned f;
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struct bundle *bundle;
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struct prompt *prompt;
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struct switches sw;
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probe_Init();
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/*
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* We open 3 descriptors to ensure that STDIN_FILENO, STDOUT_FILENO and
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* STDERR_FILENO are always open. These are closed before DoLoop(),
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* but *after* we've avoided the possibility of erroneously closing
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* an important descriptor with close(STD{IN,OUT,ERR}_FILENO).
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*/
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if ((holdfd[0] = open(_PATH_DEVNULL, O_RDWR)) == -1) {
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fprintf(stderr, "Cannot open %s !\n", _PATH_DEVNULL);
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return 2;
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}
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for (f = 1; f < sizeof holdfd / sizeof *holdfd; f++)
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holdfd[f] = dup(holdfd[0]);
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name = strrchr(argv[0], '/');
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log_Open(name ? name + 1 : argv[0]);
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#ifndef NONAT
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la = LibAliasInit(NULL);
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#endif
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label = ProcessArgs(argc, argv, &sw);
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/*
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* A FreeBSD & OpenBSD hack to dodge a bug in the tty driver that drops
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* output occasionally.... I must find the real reason some time. To
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* display 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 (sw.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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/* Allow output for the moment (except in direct mode) */
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if (sw.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", PPP_CONFDIR, CONFFILE);
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do {
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struct stat sb;
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if (stat(conf, &sb) == 0 && sb.st_mode & S_IWOTH) {
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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, sw.mode);
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else
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CheckLabel("default", prompt, sw.mode);
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if (!sw.quiet)
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prompt_Printf(prompt, "Working in %s mode\n", mode2Nam(sw.mode));
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if ((bundle = bundle_Create(TUN_PREFIX, sw.mode, sw.unit)) == NULL)
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return EX_START;
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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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if (!sw.quiet)
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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->NatEnabled = sw.nat;
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if (sw.nat)
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opt_enable(bundle, 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 (sw.mode == PHYS_INTERACTIVE)
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sig_signal(SIGTSTP, TerminalStop);
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sig_signal(SIGUSR1, RestartServer);
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sig_signal(SIGUSR2, BringDownServer);
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lastlabel = 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, argv[arg], 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 (sw.mode == PHYS_AUTO &&
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ncprange_family(&bundle->ncp.ipcp.cfg.peer_range) == AF_UNSPEC) {
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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 (sw.mode != PHYS_INTERACTIVE) {
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if (sw.mode != PHYS_DIRECT) {
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if (!sw.fg) {
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int bgpipe[2];
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pid_t bgpid;
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if (sw.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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int ret;
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if (sw.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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while ((ret = read(bgpipe[0], &c, 1)) == 1) {
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switch (c) {
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case EX_NORMAL:
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if (!sw.quiet) {
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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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}
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break;
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case EX_REDIAL:
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if (!sw.quiet)
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prompt_Printf(prompt, "Attempting redial\n");
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continue;
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case EX_RECONNECT:
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if (!sw.quiet)
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prompt_Printf(prompt, "Attempting reconnect\n");
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continue;
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default:
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prompt_Printf(prompt, "Child failed (%s)\n",
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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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break;
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}
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if (ret != 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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}
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close(bgpipe[0]);
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}
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return c;
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} else if (sw.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_ChangedPID(bundle);
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bundle_LockTun(bundle); /* we have a new pid */
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}
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/* -auto, -dedicated, -ddial, -foreground & -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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if (!sw.fg)
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setsid();
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} else {
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/*
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* -direct - STDIN_FILENO gets used by physical_Open. STDOUT_FILENO
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* *may* get used in exec/pipe mode.
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*/
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prompt_TtyInit(NULL);
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close(STDERR_FILENO);
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}
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} else {
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/* -interactive */
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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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/* We can get rid of these now */
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|
for (f = 0; f < sizeof holdfd / sizeof *holdfd; f++)
|
|
close(holdfd[f]);
|
|
|
|
log_Printf(LogPHASE, "PPP Started (%s mode).\n", mode2Nam(sw.mode));
|
|
DoLoop(bundle);
|
|
AbortProgram(EX_NORMAL);
|
|
|
|
return EX_NORMAL;
|
|
}
|
|
|
|
static void
|
|
DoLoop(struct bundle *bundle)
|
|
{
|
|
fd_set *rfds, *wfds, *efds;
|
|
int i, nfds, nothing_done;
|
|
|
|
if ((rfds = mkfdset()) == NULL) {
|
|
log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
|
|
return;
|
|
}
|
|
|
|
if ((wfds = mkfdset()) == NULL) {
|
|
log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
|
|
free(rfds);
|
|
return;
|
|
}
|
|
|
|
if ((efds = mkfdset()) == NULL) {
|
|
log_Printf(LogERROR, "DoLoop: Cannot create fd_set\n");
|
|
free(rfds);
|
|
free(wfds);
|
|
return;
|
|
}
|
|
|
|
for (; !bundle_IsDead(bundle); bundle_CleanDatalinks(bundle)) {
|
|
nfds = 0;
|
|
zerofdset(rfds);
|
|
zerofdset(wfds);
|
|
zerofdset(efds);
|
|
|
|
/* All our datalinks, the tun device and the MP socket */
|
|
descriptor_UpdateSet(&bundle->desc, rfds, wfds, efds, &nfds);
|
|
|
|
/* All our prompts and the diagnostic socket */
|
|
descriptor_UpdateSet(&server.desc, rfds, NULL, NULL, &nfds);
|
|
|
|
bundle_CleanDatalinks(bundle);
|
|
if (bundle_IsDead(bundle))
|
|
/* Don't select - we'll be here forever */
|
|
break;
|
|
|
|
/*
|
|
* It's possible that we've had a signal since we last checked. If
|
|
* we don't check again before calling select(), we may end up stuck
|
|
* after having missed the event.... sig_Handle() tries to be as
|
|
* quick as possible if nothing is likely to have happened.
|
|
* This is only really likely if we block in open(... O_NONBLOCK)
|
|
* which will happen with a misconfigured device.
|
|
*/
|
|
if (sig_Handle())
|
|
continue;
|
|
|
|
i = select(nfds, rfds, wfds, efds, NULL);
|
|
|
|
if (i < 0 && errno != EINTR) {
|
|
log_Printf(LogERROR, "DoLoop: select(): %s\n", strerror(errno));
|
|
if (log_IsKept(LogTIMER)) {
|
|
struct timeval t;
|
|
|
|
for (i = 0; i <= nfds; i++) {
|
|
if (FD_ISSET(i, rfds)) {
|
|
log_Printf(LogTIMER, "Read set contains %d\n", i);
|
|
FD_CLR(i, rfds);
|
|
t.tv_sec = t.tv_usec = 0;
|
|
if (select(nfds, rfds, wfds, efds, &t) != -1) {
|
|
log_Printf(LogTIMER, "The culprit !\n");
|
|
break;
|
|
}
|
|
}
|
|
if (FD_ISSET(i, wfds)) {
|
|
log_Printf(LogTIMER, "Write set contains %d\n", i);
|
|
FD_CLR(i, wfds);
|
|
t.tv_sec = t.tv_usec = 0;
|
|
if (select(nfds, rfds, wfds, efds, &t) != -1) {
|
|
log_Printf(LogTIMER, "The culprit !\n");
|
|
break;
|
|
}
|
|
}
|
|
if (FD_ISSET(i, efds)) {
|
|
log_Printf(LogTIMER, "Error set contains %d\n", i);
|
|
FD_CLR(i, efds);
|
|
t.tv_sec = t.tv_usec = 0;
|
|
if (select(nfds, rfds, wfds, efds, &t) != -1) {
|
|
log_Printf(LogTIMER, "The culprit !\n");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
log_Printf(LogTIMER, "Select returns %d\n", i);
|
|
|
|
sig_Handle();
|
|
|
|
if (i <= 0)
|
|
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) <= 0 && nothing_done) {
|
|
/*
|
|
* This is disastrous. 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);
|
|
}
|
|
}
|
|
|
|
log_Printf(LogDEBUG, "DoLoop done.\n");
|
|
}
|