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5106c67149
Stay as the invoking uid as much as possible. Execution as a normal user is still forbidden for now, so these changes are pretty ineffective. The next commit will implement the modifications suggested on -hackers a number of days ago.
641 lines
13 KiB
C
641 lines
13 KiB
C
/*
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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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* Most of codes are derived from chat.c by Karl Fox (karl@MorningStar.Com).
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*
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* Chat -- a program for automatic session establishment (i.e. dial
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* the phone and log in).
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*
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* This software is in the public domain.
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*
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* Please send all bug reports, requests for information, etc. to:
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*
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* Karl Fox <karl@MorningStar.Com>
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* Morning Star Technologies, Inc.
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* 1760 Zollinger Road
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* Columbus, OH 43221
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* (614)451-1883
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*
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* $Id: chat.c,v 1.36 1997/10/29 01:19:39 brian Exp $
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*
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* TODO:
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* o Support more UUCP compatible control sequences.
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* o Dialing shoud not block monitor process.
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* o Reading modem by select should be unified into main.c
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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 <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/uio.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 "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 "loadalias.h"
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#include "command.h"
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#include "vars.h"
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#include "chat.h"
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#include "sig.h"
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#include "chat.h"
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#include "modem.h"
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#ifndef isblank
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#define isblank(c) ((c) == '\t' || (c) == ' ')
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#endif
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#define IBSIZE 200
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static int TimeoutSec;
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static int abort_next, timeout_next;
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static int numaborts;
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static char *AbortStrings[50];
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static char inbuff[IBSIZE * 2 + 1];
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#define MATCH 1
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#define NOMATCH 0
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#define ABORT -1
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static char *
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findblank(char *p, int instring)
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{
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if (instring) {
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while (*p) {
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if (*p == '\\') {
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strcpy(p, p + 1);
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if (!*p)
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break;
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} else if (*p == '"')
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return (p);
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p++;
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}
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} else {
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while (*p) {
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if (isblank(*p))
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return (p);
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p++;
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}
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}
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return p;
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}
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int
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MakeArgs(char *script, char **pvect, int maxargs)
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{
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int nargs, nb;
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int instring;
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nargs = 0;
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while (*script) {
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nb = strspn(script, " \t");
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script += nb;
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if (*script) {
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if (*script == '"') {
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instring = 1;
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script++;
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if (*script == '\0')
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break; /* Shouldn't return here. Need to null
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* terminate below */
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} else
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instring = 0;
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if (nargs >= maxargs - 1)
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break;
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*pvect++ = script;
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nargs++;
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script = findblank(script, instring);
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if (*script)
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*script++ = '\0';
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}
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}
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*pvect = NULL;
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return nargs;
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}
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/*
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* \c don't add a cr
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* \d Sleep a little (delay 2 seconds
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* \n Line feed character
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* \P Auth Key password
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* \p pause 0.25 sec
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* \r Carrige return character
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* \s Space character
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* \T Telephone number(s) (defined via `set phone')
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* \t Tab character
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* \U Auth User
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*/
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char *
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ExpandString(char *str, char *result, int reslen, int sendmode)
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{
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int addcr = 0;
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char *phone;
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result[--reslen] = '\0';
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if (sendmode)
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addcr = 1;
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while (*str && reslen > 0) {
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switch (*str) {
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case '\\':
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str++;
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switch (*str) {
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case 'c':
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if (sendmode)
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addcr = 0;
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break;
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case 'd': /* Delay 2 seconds */
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nointr_sleep(2);
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break;
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case 'p':
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nointr_usleep(250000);
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break; /* Pause 0.25 sec */
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case 'n':
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*result++ = '\n';
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reslen--;
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break;
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case 'r':
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*result++ = '\r';
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reslen--;
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break;
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case 's':
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*result++ = ' ';
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reslen--;
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break;
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case 't':
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*result++ = '\t';
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reslen--;
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break;
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case 'P':
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strncpy(result, VarAuthKey, reslen);
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reslen -= strlen(result);
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result += strlen(result);
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break;
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case 'T':
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if (VarAltPhone == NULL) {
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if (VarNextPhone == NULL) {
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strcpy(VarPhoneCopy, VarPhoneList);
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VarNextPhone = VarPhoneCopy;
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}
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VarAltPhone = strsep(&VarNextPhone, ":");
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}
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phone = strsep(&VarAltPhone, "|");
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strncpy(result, phone, reslen);
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reslen -= strlen(result);
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result += strlen(result);
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if (VarTerm)
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fprintf(VarTerm, "Phone: %s\n", phone);
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LogPrintf(LogPHASE, "Phone: %s\n", phone);
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break;
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case 'U':
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strncpy(result, VarAuthName, reslen);
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reslen -= strlen(result);
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result += strlen(result);
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break;
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default:
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reslen--;
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*result++ = *str;
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break;
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}
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if (*str)
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str++;
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break;
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case '^':
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str++;
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if (*str) {
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*result++ = *str++ & 0x1f;
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reslen--;
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}
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break;
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default:
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*result++ = *str++;
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reslen--;
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break;
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}
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}
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if (--reslen > 0) {
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if (addcr)
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*result++ = '\r';
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}
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if (--reslen > 0)
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*result++ = '\0';
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return (result);
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}
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#define MAXLOGBUFF 200
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static char logbuff[MAXLOGBUFF];
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static int loglen = 0;
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static void
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clear_log()
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{
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memset(logbuff, 0, MAXLOGBUFF);
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loglen = 0;
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}
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static void
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flush_log()
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{
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if (LogIsKept(LogCONNECT))
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LogPrintf(LogCONNECT, "%s\n", logbuff);
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else if (LogIsKept(LogCARRIER) && strstr(logbuff, "CARRIER"))
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LogPrintf(LogCARRIER, "%s\n", logbuff);
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clear_log();
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}
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static void
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connect_log(char *str, int single_p)
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{
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int space = MAXLOGBUFF - loglen - 1;
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while (space--) {
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if (*str == '\n') {
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flush_log();
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} else {
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logbuff[loglen++] = *str;
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}
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if (single_p || !*++str)
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break;
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}
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if (!space)
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flush_log();
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}
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static int
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WaitforString(char *estr)
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{
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struct timeval timeout;
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char *s, *str, ch;
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char *inp;
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fd_set rfds;
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int i, nfds, nb;
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char buff[IBSIZE];
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#ifdef SIGALRM
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int omask;
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omask = sigblock(sigmask(SIGALRM));
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#endif
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clear_log();
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(void) ExpandString(estr, buff, sizeof(buff), 0);
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LogPrintf(LogCHAT, "Wait for (%d): %s --> %s\n", TimeoutSec, estr, buff);
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str = buff;
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inp = inbuff;
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if (strlen(str) >= IBSIZE) {
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str[IBSIZE - 1] = 0;
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LogPrintf(LogCHAT, "Truncating String to %d character: %s\n", IBSIZE, str);
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}
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nfds = modem + 1;
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s = str;
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for (;;) {
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FD_ZERO(&rfds);
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FD_SET(modem, &rfds);
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/*
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* Because it is not clear whether select() modifies timeout value, it is
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* better to initialize timeout values everytime.
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*/
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timeout.tv_sec = TimeoutSec;
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timeout.tv_usec = 0;
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i = select(nfds, &rfds, NULL, NULL, &timeout);
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#ifdef notdef
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TimerService();
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#endif
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if (i < 0) {
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#ifdef SIGALRM
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if (errno == EINTR)
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continue;
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sigsetmask(omask);
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#endif
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LogPrintf(LogERROR, "WaitForString: select(): %s\n", strerror(errno));
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*inp = 0;
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return (NOMATCH);
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} else if (i == 0) { /* Timeout reached! */
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*inp = 0;
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if (inp != inbuff)
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LogPrintf(LogCHAT, "Got: %s\n", inbuff);
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LogPrintf(LogCHAT, "Can't get (%d).\n", timeout.tv_sec);
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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return (NOMATCH);
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}
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if (FD_ISSET(modem, &rfds)) { /* got something */
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if (DEV_IS_SYNC) {
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int length;
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if ((length = strlen(inbuff)) > IBSIZE) {
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/* shuffle down next part */
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memcpy(inbuff, &(inbuff[IBSIZE]), IBSIZE + 1);
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length = strlen(inbuff);
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}
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nb = read(modem, &(inbuff[length]), IBSIZE);
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inbuff[nb + length] = 0;
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connect_log(inbuff, 0);
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if (strstr(inbuff, str)) {
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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flush_log();
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return (MATCH);
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}
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for (i = 0; i < numaborts; i++) {
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if (strstr(inbuff, AbortStrings[i])) {
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LogPrintf(LogCHAT, "Abort: %s\n", AbortStrings[i]);
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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flush_log();
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return (ABORT);
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}
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}
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} else {
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if (read(modem, &ch, 1) < 0) {
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LogPrintf(LogERROR, "read error: %s\n", strerror(errno));
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*inp = '\0';
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return (NOMATCH);
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}
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connect_log(&ch, 1);
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*inp++ = ch;
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if (ch == *s) {
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s++;
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if (*s == '\0') {
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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*inp = 0;
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flush_log();
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return (MATCH);
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}
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} else
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s = str;
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if (inp == inbuff + IBSIZE) {
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memcpy(inbuff, inp - 100, 100);
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inp = inbuff + 100;
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}
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if (s == str) {
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for (i = 0; i < numaborts; i++) { /* Look for Abort strings */
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int len;
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char *s1;
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s1 = AbortStrings[i];
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len = strlen(s1);
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if ((len <= inp - inbuff) && (strncmp(inp - len, s1, len) == 0)) {
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LogPrintf(LogCHAT, "Abort: %s\n", s1);
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*inp = 0;
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#ifdef SIGALRM
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sigsetmask(omask);
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#endif
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flush_log();
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return (ABORT);
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}
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}
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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 void
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ExecStr(char *command, char *out)
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{
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int pid;
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int fids[2];
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char *vector[20];
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int stat, nb;
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char *cp;
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char tmp[300];
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cp = inbuff + strlen(inbuff) - 1;
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while (cp > inbuff) {
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if (*cp < ' ' && *cp != '\t') {
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cp++;
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break;
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}
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cp--;
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}
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if (snprintf(tmp, sizeof tmp, "%s %s", command, cp) >= sizeof tmp) {
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LogPrintf(LogCHAT, "Too long string to ExecStr: \"%s\"\n", command);
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return;
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}
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(void) MakeArgs(tmp, vector, VECSIZE(vector));
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if (pipe(fids) < 0) {
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LogPrintf(LogCHAT, "Unable to create pipe in ExecStr: %s\n",
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strerror(errno));
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return;
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}
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pid = fork();
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if (pid == 0) {
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TermTimerService();
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signal(SIGINT, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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signal(SIGHUP, SIG_DFL);
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signal(SIGALRM, SIG_DFL);
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close(fids[0]);
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if (dup2(fids[1], 1) < 0) {
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LogPrintf(LogCHAT, "dup2(fids[1], 1) in ExecStr: %s\n", strerror(errno));
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return;
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}
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close(fids[1]);
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nb = open("/dev/tty", O_RDWR);
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if (dup2(nb, 0) < 0) {
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LogPrintf(LogCHAT, "dup2(nb, 0) in ExecStr: %s\n", strerror(errno));
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return;
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}
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setuid(geteuid());
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LogPrintf(LogCHAT, "exec: %s\n", command);
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pid = execvp(command, vector);
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LogPrintf(LogCHAT, "execvp failed for (%d/%d): %s\n", pid, errno, command);
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exit(127);
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} else {
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close(fids[1]);
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for (;;) {
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nb = read(fids[0], out, 1);
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if (nb <= 0)
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break;
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out++;
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}
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*out = '\0';
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close(fids[0]);
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close(fids[1]);
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waitpid(pid, &stat, WNOHANG);
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}
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}
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static void
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SendString(char *str)
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{
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char *cp;
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int on;
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char buff[200];
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if (abort_next) {
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abort_next = 0;
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ExpandString(str, buff, sizeof(buff), 0);
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AbortStrings[numaborts++] = strdup(buff);
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} else if (timeout_next) {
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timeout_next = 0;
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TimeoutSec = atoi(str);
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if (TimeoutSec <= 0)
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TimeoutSec = 30;
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} else {
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if (*str == '!') {
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(void) ExpandString(str + 1, buff + 2, sizeof(buff) - 2, 0);
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ExecStr(buff + 2, buff + 2);
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} else {
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(void) ExpandString(str, buff + 2, sizeof(buff) - 2, 1);
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}
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if (strstr(str, "\\P")) /* Do not log the password itself. */
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LogPrintf(LogCHAT, "sending: %s\n", str);
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else
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LogPrintf(LogCHAT, "sending: %s\n", buff + 2);
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cp = buff;
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if (DEV_IS_SYNC)
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memcpy(buff, "\377\003", 2); /* Prepend HDLC header */
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else
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cp += 2;
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on = strlen(cp);
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write(modem, cp, on);
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}
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}
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static int
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ExpectString(char *str)
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{
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char *minus;
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int state;
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if (strcmp(str, "ABORT") == 0) {
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++abort_next;
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return (MATCH);
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}
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if (strcmp(str, "TIMEOUT") == 0) {
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++timeout_next;
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return (MATCH);
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}
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LogPrintf(LogCHAT, "Expecting %s\n", str);
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while (*str) {
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/*
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* Check whether if string contains sub-send-expect.
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*/
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for (minus = str; *minus; minus++) {
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if (*minus == '-') {
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if (minus == str || minus[-1] != '\\')
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break;
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}
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}
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if (*minus == '-') { /* We have sub-send-expect. */
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*minus++ = '\0';
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state = WaitforString(str);
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if (state != NOMATCH)
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return (state);
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/*
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* Can't get expect string. Sendout send part.
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*/
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str = minus;
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for (minus = str; *minus; minus++) {
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if (*minus == '-') {
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if (minus == str || minus[-1] != '\\')
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break;
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}
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}
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if (*minus == '-') {
|
|
*minus++ = '\0';
|
|
SendString(str);
|
|
str = minus;
|
|
} else {
|
|
SendString(str);
|
|
return (MATCH);
|
|
}
|
|
} else {
|
|
|
|
/*
|
|
* Simple case. Wait for string.
|
|
*/
|
|
return (WaitforString(str));
|
|
}
|
|
}
|
|
return (MATCH);
|
|
}
|
|
|
|
static jmp_buf ChatEnv;
|
|
static void (*oint) (int);
|
|
|
|
static void
|
|
StopDial(int sig)
|
|
{
|
|
LogPrintf(LogPHASE, "DoChat: Caught signal %d, abort connect\n", sig);
|
|
longjmp(ChatEnv, 1);
|
|
}
|
|
|
|
int
|
|
DoChat(char *script)
|
|
{
|
|
char *vector[40];
|
|
char **argv;
|
|
int argc, n, state;
|
|
|
|
if (!script || !*script)
|
|
return MATCH;
|
|
|
|
/* While we're chatting, we want an INT to fail us */
|
|
if (setjmp(ChatEnv)) {
|
|
signal(SIGINT, oint);
|
|
return (-1);
|
|
}
|
|
oint = signal(SIGINT, StopDial);
|
|
|
|
timeout_next = abort_next = 0;
|
|
for (n = 0; AbortStrings[n]; n++) {
|
|
free(AbortStrings[n]);
|
|
AbortStrings[n] = NULL;
|
|
}
|
|
numaborts = 0;
|
|
|
|
memset(vector, '\0', sizeof(vector));
|
|
n = MakeArgs(script, vector, VECSIZE(vector));
|
|
argc = n;
|
|
argv = vector;
|
|
TimeoutSec = 30;
|
|
while (*argv) {
|
|
if (strcmp(*argv, "P_ZERO") == 0 ||
|
|
strcmp(*argv, "P_ODD") == 0 || strcmp(*argv, "P_EVEN") == 0) {
|
|
ChangeParity(*argv++);
|
|
continue;
|
|
}
|
|
state = ExpectString(*argv++);
|
|
switch (state) {
|
|
case MATCH:
|
|
if (*argv)
|
|
SendString(*argv++);
|
|
break;
|
|
case ABORT:
|
|
case NOMATCH:
|
|
signal(SIGINT, oint);
|
|
return (NOMATCH);
|
|
}
|
|
}
|
|
signal(SIGINT, oint);
|
|
return (MATCH);
|
|
}
|