757 lines
19 KiB
C
757 lines
19 KiB
C
/*-
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* Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
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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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* $Id: chat.c,v 1.55 1999/05/08 11:06:18 brian Exp $
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.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 "layer.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 "timer.h"
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#include "lqr.h"
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#include "hdlc.h"
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#include "throughput.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ccp.h"
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#include "link.h"
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#include "async.h"
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#include "descriptor.h"
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#include "physical.h"
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#include "chat.h"
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#include "mp.h"
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#include "auth.h"
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#include "chap.h"
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#include "slcompress.h"
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#include "iplist.h"
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#include "ipcp.h"
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#include "filter.h"
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#include "cbcp.h"
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#include "command.h"
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#include "datalink.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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#define BUFLEFT(c) (sizeof (c)->buf - ((c)->bufend - (c)->buf))
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static void ExecStr(struct physical *, char *, char *, int);
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static char *ExpandString(struct chat *, const char *, char *, int, int);
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static void
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chat_PauseTimer(void *v)
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{
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struct chat *c = (struct chat *)v;
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timer_Stop(&c->pause);
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c->pause.load = 0;
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}
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static void
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chat_Pause(struct chat *c, u_long load)
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{
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timer_Stop(&c->pause);
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c->pause.load += load;
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c->pause.func = chat_PauseTimer;
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c->pause.name = "chat pause";
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c->pause.arg = c;
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timer_Start(&c->pause);
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}
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static void
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chat_TimeoutTimer(void *v)
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{
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struct chat *c = (struct chat *)v;
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timer_Stop(&c->timeout);
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c->TimedOut = 1;
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}
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static void
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chat_SetTimeout(struct chat *c)
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{
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timer_Stop(&c->timeout);
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if (c->TimeoutSec > 0) {
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c->timeout.load = SECTICKS * c->TimeoutSec;
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c->timeout.func = chat_TimeoutTimer;
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c->timeout.name = "chat timeout";
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c->timeout.arg = c;
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timer_Start(&c->timeout);
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}
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}
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static char *
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chat_NextChar(char *ptr, char ch)
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{
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for (; *ptr; ptr++)
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if (*ptr == ch)
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return ptr;
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else if (*ptr == '\\')
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if (*++ptr == '\0')
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return NULL;
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return NULL;
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}
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static int
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chat_UpdateSet(struct descriptor *d, fd_set *r, fd_set *w, fd_set *e, int *n)
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{
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struct chat *c = descriptor2chat(d);
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int special, gotabort, gottimeout, needcr;
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int TimedOut = c->TimedOut;
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static char arg_term; /* An empty string */
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if (c->pause.state == TIMER_RUNNING)
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return 0;
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if (TimedOut) {
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log_Printf(LogCHAT, "Expect timeout\n");
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if (c->nargptr == NULL)
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c->state = CHAT_FAILED;
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else {
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/* c->state = CHAT_EXPECT; */
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c->argptr = &arg_term;
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}
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c->TimedOut = 0;
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}
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if (c->state != CHAT_EXPECT && c->state != CHAT_SEND)
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return 0;
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gottimeout = gotabort = 0;
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if (c->arg < c->argc && (c->arg < 0 || *c->argptr == '\0')) {
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/* Go get the next string */
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if (c->arg < 0 || c->state == CHAT_SEND)
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c->state = CHAT_EXPECT;
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else
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c->state = CHAT_SEND;
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special = 1;
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while (special && (c->nargptr || c->arg < c->argc - 1)) {
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if (c->arg < 0 || (!TimedOut && c->state == CHAT_SEND))
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c->nargptr = NULL;
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if (c->nargptr != NULL) {
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/* We're doing expect-send-expect.... */
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c->argptr = c->nargptr;
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/* Put the '-' back in case we ever want to rerun our script */
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c->nargptr[-1] = '-';
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c->nargptr = chat_NextChar(c->nargptr, '-');
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if (c->nargptr != NULL)
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*c->nargptr++ = '\0';
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} else {
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int minus;
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c->argptr = c->argv[++c->arg];
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if (c->state == CHAT_EXPECT) {
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/* Look for expect-send-expect sequence */
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c->nargptr = c->argptr;
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minus = 0;
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while ((c->nargptr = chat_NextChar(c->nargptr, '-'))) {
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c->nargptr++;
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minus++;
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}
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if (minus % 2)
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log_Printf(LogWARN, "chat_UpdateSet: \"%s\": Uneven number of"
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" '-' chars, all ignored\n", c->argptr);
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else if (minus) {
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c->nargptr = chat_NextChar(c->argptr, '-');
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*c->nargptr++ = '\0';
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}
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}
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}
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/*
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* c->argptr now temporarily points into c->script (via c->argv)
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* If it's an expect-send-expect sequence, we've just got the correct
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* portion of that sequence.
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*/
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needcr = c->state == CHAT_SEND && *c->argptr != '!';
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/* We leave room for a potential HDLC header in the target string */
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ExpandString(c, c->argptr, c->exp + 2, sizeof c->exp - 2, needcr);
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/*
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* Now read our string. If it's not a special string, we unset
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* ``special'' to break out of the loop.
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*/
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if (gotabort) {
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if (c->abort.num < MAXABORTS) {
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int len, i;
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len = strlen(c->exp+2);
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for (i = 0; i < c->abort.num; i++)
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if (len > c->abort.string[i].len) {
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int last;
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for (last = c->abort.num; last > i; last--) {
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c->abort.string[last].data = c->abort.string[last-1].data;
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c->abort.string[last].len = c->abort.string[last-1].len;
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}
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break;
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}
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c->abort.string[i].len = len;
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c->abort.string[i].data = (char *)malloc(len+1);
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memcpy(c->abort.string[i].data, c->exp+2, len+1);
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c->abort.num++;
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} else
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log_Printf(LogERROR, "chat_UpdateSet: too many abort strings\n");
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gotabort = 0;
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} else if (gottimeout) {
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c->TimeoutSec = atoi(c->exp + 2);
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if (c->TimeoutSec <= 0)
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c->TimeoutSec = 30;
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gottimeout = 0;
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} else if (c->nargptr == NULL && !strcmp(c->exp+2, "ABORT"))
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gotabort = 1;
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else if (c->nargptr == NULL && !strcmp(c->exp+2, "TIMEOUT"))
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gottimeout = 1;
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else {
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if (c->exp[2] == '!')
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ExecStr(c->physical, c->exp + 3, c->exp + 2, sizeof c->exp - 2);
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if (c->exp[2] == '\0') {
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/* Empty string, reparse (this may be better as a `goto start') */
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c->argptr = &arg_term;
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return chat_UpdateSet(d, r, w, e, n);
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}
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special = 0;
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}
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}
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if (special) {
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if (gottimeout)
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log_Printf(LogWARN, "chat_UpdateSet: TIMEOUT: Argument expected\n");
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else if (gotabort)
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log_Printf(LogWARN, "chat_UpdateSet: ABORT: Argument expected\n");
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/* End of script - all ok */
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c->state = CHAT_DONE;
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return 0;
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}
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/* set c->argptr to point in the right place */
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c->argptr = c->exp + 2;
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c->arglen = strlen(c->argptr);
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if (c->state == CHAT_EXPECT) {
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/* We must check to see if the string's already been found ! */
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char *begin, *end;
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end = c->bufend - c->arglen + 1;
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if (end < c->bufstart)
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end = c->bufstart;
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for (begin = c->bufstart; begin < end; begin++)
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if (!strncmp(begin, c->argptr, c->arglen)) {
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c->bufstart = begin + c->arglen;
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c->argptr += c->arglen;
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c->arglen = 0;
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/* Continue - we've already read our expect string */
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return chat_UpdateSet(d, r, w, e, n);
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}
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log_Printf(LogCHAT, "Expect(%d): %s\n", c->TimeoutSec, c->argptr);
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chat_SetTimeout(c);
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}
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}
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/*
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* We now have c->argptr pointing at what we want to expect/send and
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* c->state saying what we want to do... we now know what to put in
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* the fd_set :-)
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*/
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if (c->state == CHAT_EXPECT)
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return physical_doUpdateSet(&c->physical->desc, r, NULL, e, n, 1);
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else
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return physical_doUpdateSet(&c->physical->desc, NULL, w, e, n, 1);
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}
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static int
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chat_IsSet(struct descriptor *d, const fd_set *fdset)
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{
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struct chat *c = descriptor2chat(d);
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return physical_IsSet(&c->physical->desc, fdset);
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}
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static void
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chat_UpdateLog(struct chat *c, int in)
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{
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if (log_IsKept(LogCHAT) || log_IsKept(LogCONNECT)) {
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/*
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* If a linefeed appears in the last `in' characters of `c's input
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* buffer, output from there, all the way back to the last linefeed.
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* This is called for every read of `in' bytes.
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*/
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char *ptr, *end, *stop, ch;
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int level;
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level = log_IsKept(LogCHAT) ? LogCHAT : LogCONNECT;
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if (in == -1)
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end = ptr = c->bufend;
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else {
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ptr = c->bufend - in;
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for (end = c->bufend - 1; end >= ptr; end--)
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if (*end == '\n')
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break;
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}
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if (end >= ptr) {
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for (ptr = c->bufend - (in == -1 ? 1 : in + 1); ptr >= c->bufstart; ptr--)
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if (*ptr == '\n')
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break;
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ptr++;
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stop = NULL;
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while (stop < end) {
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if ((stop = memchr(ptr, '\n', end - ptr)) == NULL)
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stop = end;
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ch = *stop;
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*stop = '\0';
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if (level == LogCHAT || strstr(ptr, "CONNECT"))
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log_Printf(level, "Received: %s\n", ptr);
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*stop = ch;
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ptr = stop + 1;
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}
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}
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}
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}
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static void
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chat_Read(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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struct chat *c = descriptor2chat(d);
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if (c->state == CHAT_EXPECT) {
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ssize_t in;
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char *abegin, *ebegin, *begin, *aend, *eend, *end;
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int n;
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/*
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* XXX - should this read only 1 byte to guarantee that we don't
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* swallow any ppp talk from the peer ?
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*/
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in = BUFLEFT(c);
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if (in > sizeof c->buf / 2)
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in = sizeof c->buf / 2;
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in = physical_Read(c->physical, c->bufend, in);
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if (in <= 0)
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return;
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/* `begin' and `end' delimit where we're going to strncmp() from */
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ebegin = c->bufend - c->arglen + 1;
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eend = ebegin + in;
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if (ebegin < c->bufstart)
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ebegin = c->bufstart;
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if (c->abort.num) {
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abegin = c->bufend - c->abort.string[0].len + 1;
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aend = c->bufend - c->abort.string[c->abort.num-1].len + in + 1;
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if (abegin < c->bufstart)
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abegin = c->bufstart;
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} else {
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abegin = ebegin;
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aend = eend;
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}
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begin = abegin < ebegin ? abegin : ebegin;
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end = aend < eend ? eend : aend;
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c->bufend += in;
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chat_UpdateLog(c, in);
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if (c->bufend > c->buf + sizeof c->buf / 2) {
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/* Shuffle our receive buffer back a bit */
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int chop;
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for (chop = begin - c->buf; chop; chop--)
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if (c->buf[chop] == '\n')
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/* found some already-logged garbage to remove :-) */
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break;
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if (!chop)
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chop = begin - c->buf;
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if (chop) {
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char *from, *to;
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to = c->buf;
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from = to + chop;
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while (from < c->bufend)
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*to++ = *from++;
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c->bufstart -= chop;
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c->bufend -= chop;
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begin -= chop;
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end -= chop;
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abegin -= chop;
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aend -= chop;
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ebegin -= chop;
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eend -= chop;
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}
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}
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for (; begin < end; begin++)
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if (begin >= ebegin && begin < eend &&
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!strncmp(begin, c->argptr, c->arglen)) {
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/* Got it ! */
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timer_Stop(&c->timeout);
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if (memchr(begin + c->arglen - 1, '\n',
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c->bufend - begin - c->arglen + 1) == NULL) {
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/* force it into the log */
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end = c->bufend;
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c->bufend = begin + c->arglen;
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chat_UpdateLog(c, -1);
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c->bufend = end;
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}
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c->bufstart = begin + c->arglen;
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c->argptr += c->arglen;
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c->arglen = 0;
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break;
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} else if (begin >= abegin && begin < aend) {
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for (n = c->abort.num - 1; n >= 0; n--) {
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if (begin + c->abort.string[n].len > c->bufend)
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break;
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if (!strncmp(begin, c->abort.string[n].data,
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c->abort.string[n].len)) {
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if (memchr(begin + c->abort.string[n].len - 1, '\n',
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c->bufend - begin - c->abort.string[n].len + 1) == NULL) {
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/* force it into the log */
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end = c->bufend;
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c->bufend = begin + c->abort.string[n].len;
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chat_UpdateLog(c, -1);
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c->bufend = end;
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}
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c->bufstart = begin + c->abort.string[n].len;
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c->state = CHAT_FAILED;
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return;
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}
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}
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}
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}
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}
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static int
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chat_Write(struct descriptor *d, struct bundle *bundle, const fd_set *fdset)
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{
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struct chat *c = descriptor2chat(d);
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int result = 0;
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if (c->state == CHAT_SEND) {
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int wrote;
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if (strstr(c->argv[c->arg], "\\P")) /* Don't log the password */
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log_Printf(LogCHAT, "Send: %s\n", c->argv[c->arg]);
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else {
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int sz;
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sz = c->arglen - 1;
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while (sz >= 0 && c->argptr[sz] == '\n')
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sz--;
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log_Printf(LogCHAT, "Send: %.*s\n", sz + 1, c->argptr);
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}
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if (physical_IsSync(c->physical)) {
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/*
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* XXX: Fix me
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* This data should be stuffed down through the link layers
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*/
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/* There's always room for the HDLC header */
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c->argptr -= 2;
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c->arglen += 2;
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memcpy(c->argptr, "\377\003", 2); /* Prepend HDLC header */
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}
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wrote = physical_Write(c->physical, c->argptr, c->arglen);
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result = wrote ? 1 : 0;
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if (wrote == -1) {
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if (errno != EINTR)
|
|
log_Printf(LogERROR, "chat_Write: %s\n", strerror(errno));
|
|
if (physical_IsSync(c->physical)) {
|
|
c->argptr += 2;
|
|
c->arglen -= 2;
|
|
}
|
|
} else if (wrote < 2 && physical_IsSync(c->physical)) {
|
|
/* Oops - didn't even write our HDLC header ! */
|
|
c->argptr += 2;
|
|
c->arglen -= 2;
|
|
} else {
|
|
c->argptr += wrote;
|
|
c->arglen -= wrote;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
void
|
|
chat_Init(struct chat *c, struct physical *p, const char *data, int emptybuf,
|
|
const char *phone)
|
|
{
|
|
c->desc.type = CHAT_DESCRIPTOR;
|
|
c->desc.UpdateSet = chat_UpdateSet;
|
|
c->desc.IsSet = chat_IsSet;
|
|
c->desc.Read = chat_Read;
|
|
c->desc.Write = chat_Write;
|
|
c->physical = p;
|
|
|
|
c->state = CHAT_EXPECT;
|
|
|
|
if (data == NULL) {
|
|
*c->script = '\0';
|
|
c->argc = 0;
|
|
} else {
|
|
strncpy(c->script, data, sizeof c->script - 1);
|
|
c->script[sizeof c->script - 1] = '\0';
|
|
c->argc = MakeArgs(c->script, c->argv, VECSIZE(c->argv));
|
|
}
|
|
|
|
c->arg = -1;
|
|
c->argptr = NULL;
|
|
c->nargptr = NULL;
|
|
|
|
if (emptybuf)
|
|
c->bufstart = c->bufend = c->buf;
|
|
|
|
c->TimeoutSec = 30;
|
|
c->TimedOut = 0;
|
|
c->phone = phone;
|
|
c->abort.num = 0;
|
|
|
|
memset(&c->pause, '\0', sizeof c->pause);
|
|
memset(&c->timeout, '\0', sizeof c->timeout);
|
|
}
|
|
|
|
void
|
|
chat_Destroy(struct chat *c)
|
|
{
|
|
timer_Stop(&c->pause);
|
|
timer_Stop(&c->timeout);
|
|
while (c->abort.num)
|
|
free(c->abort.string[--c->abort.num].data);
|
|
c->abort.num = 0;
|
|
}
|
|
|
|
/*
|
|
* \c don't add a cr
|
|
* \d Sleep a little (delay 2 seconds
|
|
* \n Line feed character
|
|
* \P Auth Key password
|
|
* \p pause 0.25 sec
|
|
* \r Carrige return character
|
|
* \s Space character
|
|
* \T Telephone number(s) (defined via `set phone')
|
|
* \t Tab character
|
|
* \U Auth User
|
|
*/
|
|
static char *
|
|
ExpandString(struct chat *c, const char *str, char *result, int reslen, int cr)
|
|
{
|
|
int len;
|
|
|
|
result[--reslen] = '\0';
|
|
while (*str && reslen > 0) {
|
|
switch (*str) {
|
|
case '\\':
|
|
str++;
|
|
switch (*str) {
|
|
case 'c':
|
|
cr = 0;
|
|
break;
|
|
case 'd': /* Delay 2 seconds */
|
|
chat_Pause(c, 2 * SECTICKS);
|
|
break;
|
|
case 'p':
|
|
chat_Pause(c, SECTICKS / 4);
|
|
break; /* Delay 0.25 seconds */
|
|
case 'n':
|
|
*result++ = '\n';
|
|
reslen--;
|
|
break;
|
|
case 'r':
|
|
*result++ = '\r';
|
|
reslen--;
|
|
break;
|
|
case 's':
|
|
*result++ = ' ';
|
|
reslen--;
|
|
break;
|
|
case 't':
|
|
*result++ = '\t';
|
|
reslen--;
|
|
break;
|
|
case 'P':
|
|
strncpy(result, c->physical->dl->bundle->cfg.auth.key, reslen);
|
|
len = strlen(result);
|
|
reslen -= len;
|
|
result += len;
|
|
break;
|
|
case 'T':
|
|
if (c->phone) {
|
|
strncpy(result, c->phone, reslen);
|
|
len = strlen(result);
|
|
reslen -= len;
|
|
result += len;
|
|
}
|
|
break;
|
|
case 'U':
|
|
strncpy(result, c->physical->dl->bundle->cfg.auth.name, reslen);
|
|
len = strlen(result);
|
|
reslen -= len;
|
|
result += len;
|
|
break;
|
|
default:
|
|
reslen--;
|
|
*result++ = *str;
|
|
break;
|
|
}
|
|
if (*str)
|
|
str++;
|
|
break;
|
|
case '^':
|
|
str++;
|
|
if (*str) {
|
|
*result++ = *str++ & 0x1f;
|
|
reslen--;
|
|
}
|
|
break;
|
|
default:
|
|
*result++ = *str++;
|
|
reslen--;
|
|
break;
|
|
}
|
|
}
|
|
if (--reslen > 0) {
|
|
if (cr)
|
|
*result++ = '\r';
|
|
}
|
|
if (--reslen > 0)
|
|
*result++ = '\0';
|
|
return (result);
|
|
}
|
|
|
|
static void
|
|
ExecStr(struct physical *physical, char *command, char *out, int olen)
|
|
{
|
|
pid_t pid;
|
|
int fids[2];
|
|
char *argv[MAXARGS], *vector[MAXARGS], *startout, *endout;
|
|
int stat, nb, argc;
|
|
|
|
log_Printf(LogCHAT, "Exec: %s\n", command);
|
|
argc = MakeArgs(command, vector, VECSIZE(vector));
|
|
command_Expand(argv, argc, (char const *const *)vector,
|
|
physical->dl->bundle, 0);
|
|
|
|
if (pipe(fids) < 0) {
|
|
log_Printf(LogCHAT, "Unable to create pipe in ExecStr: %s\n",
|
|
strerror(errno));
|
|
*out = '\0';
|
|
return;
|
|
}
|
|
if ((pid = fork()) == 0) {
|
|
close(fids[0]);
|
|
timer_TermService();
|
|
fids[1] = fcntl(fids[1], F_DUPFD, 4);
|
|
dup2(physical->fd, STDIN_FILENO);
|
|
dup2(STDIN_FILENO, STDOUT_FILENO);
|
|
dup2(fids[1], STDERR_FILENO);
|
|
close(3);
|
|
if (open(_PATH_TTY, O_RDWR) == 3)
|
|
fcntl(3, F_SETFD, 0); /* Clear close-on-exec flag */
|
|
else
|
|
fcntl(3, F_SETFD, 1); /* Set close-on-exec flag */
|
|
setuid(geteuid());
|
|
execvp(argv[0], argv);
|
|
fprintf(stderr, "execvp: %s: %s\n", argv[0], strerror(errno));
|
|
exit(127);
|
|
} else {
|
|
char *name = strdup(vector[0]);
|
|
|
|
close(fids[1]);
|
|
endout = out + olen - 1;
|
|
startout = out;
|
|
while (out < endout) {
|
|
nb = read(fids[0], out, 1);
|
|
if (nb <= 0)
|
|
break;
|
|
out++;
|
|
}
|
|
*out = '\0';
|
|
close(fids[0]);
|
|
close(fids[1]);
|
|
waitpid(pid, &stat, WNOHANG);
|
|
if (WIFSIGNALED(stat)) {
|
|
log_Printf(LogWARN, "%s: signal %d\n", name, WTERMSIG(stat));
|
|
free(name);
|
|
*out = '\0';
|
|
return;
|
|
} else if (WIFEXITED(stat)) {
|
|
switch (WEXITSTATUS(stat)) {
|
|
case 0:
|
|
free(name);
|
|
break;
|
|
case 127:
|
|
log_Printf(LogWARN, "%s: %s\n", name, startout);
|
|
free(name);
|
|
*out = '\0';
|
|
return;
|
|
break;
|
|
default:
|
|
log_Printf(LogWARN, "%s: exit %d\n", name, WEXITSTATUS(stat));
|
|
free(name);
|
|
*out = '\0';
|
|
return;
|
|
break;
|
|
}
|
|
} else {
|
|
log_Printf(LogWARN, "%s: Unexpected exit result\n", name);
|
|
free(name);
|
|
*out = '\0';
|
|
return;
|
|
}
|
|
}
|
|
}
|