1/*
2 * Copyright 2000 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5/*
6 *	Chat -- a program for automatic session establishment (i.e. dial
7 *		the phone and log in).
8 *
9 * Standard termination codes:
10 *  0 - successful completion of the script
11 *  1 - invalid argument, expect string too large, etc.
12 *  2 - error on an I/O operation or fatal error condition.
13 *  3 - timeout waiting for a simple string.
14 *  4 - the first string declared as "ABORT"
15 *  5 - the second string declared as "ABORT"
16 *  6 - ... and so on for successive ABORT strings.
17 *
18 *	This software is in the public domain.
19 *
20 * -----------------
21 *	22-May-99 added environment substitutuion, enabled with -E switch.
22 *	Andreas Arens <andras@cityweb.de>.
23 *
24 *	12-May-99 added a feature to read data to be sent from a file,
25 *	if the send string starts with @.  Idea from gpk <gpk@onramp.net>.
26 *
27 *	added -T and -U option and \T and \U substitution to pass a phone
28 *	number into chat script. Two are needed for some ISDN TA applications.
29 *	Keith Dart <kdart@cisco.com>
30 *
31 *
32 *	Added SAY keyword to send output to stderr.
33 *      This allows to turn ECHO OFF and to output specific, user selected,
34 *      text to give progress messages. This best works when stderr
35 *      exists (i.e.: pppd in nodetach mode).
36 *
37 * 	Added HANGUP directives to allow for us to be called
38 *      back. When HANGUP is set to NO, chat will not hangup at HUP signal.
39 *      We rely on timeouts in that case.
40 *
41 *      Added CLR_ABORT to clear previously set ABORT string. This has been
42 *      dictated by the HANGUP above as "NO CARRIER" (for example) must be
43 *      an ABORT condition until we know the other host is going to close
44 *      the connection for call back. As soon as we have completed the
45 *      first stage of the call back sequence, "NO CARRIER" is a valid, non
46 *      fatal string. As soon as we got called back (probably get "CONNECT"),
47 *      we should re-arm the ABORT "NO CARRIER". Hence the CLR_ABORT command.
48 *      Note that CLR_ABORT packs the abort_strings[] array so that we do not
49 *      have unused entries not being reclaimed.
50 *
51 *      In the same vein as above, added CLR_REPORT keyword.
52 *
53 *      Allow for comments. Line starting with '#' are comments and are
54 *      ignored. If a '#' is to be expected as the first character, the
55 *      expect string must be quoted.
56 *
57 *
58 *		Francis Demierre <Francis@SwissMail.Com>
59 * 		Thu May 15 17:15:40 MET DST 1997
60 *
61 *
62 *      Added -r "report file" switch & REPORT keyword.
63 *              Robert Geer <bgeer@xmission.com>
64 *
65 *      Added -s "use stderr" and -S "don't use syslog" switches.
66 *              June 18, 1997
67 *              Karl O. Pinc <kop@meme.com>
68 *
69 *
70 *	Added -e "echo" switch & ECHO keyword
71 *		Dick Streefland <dicks@tasking.nl>
72 *
73 *
74 *	Considerable updates and modifications by
75 *		Al Longyear <longyear@pobox.com>
76 *		Paul Mackerras <paulus@cs.anu.edu.au>
77 *
78 *
79 *	The original author is:
80 *
81 *		Karl Fox <karl@MorningStar.Com>
82 *		Morning Star Technologies, Inc.
83 *		1760 Zollinger Road
84 *		Columbus, OH  43221
85 *		(614)451-1883
86 *
87 */
88
89#ifndef __STDC__
90#define const
91#endif
92
93#include <stdio.h>
94#include <ctype.h>
95#include <time.h>
96#include <fcntl.h>
97#include <signal.h>
98#include <errno.h>
99#include <string.h>
100#include <stdlib.h>
101#include <unistd.h>
102#include <sys/types.h>
103#include <sys/stat.h>
104#include <syslog.h>
105
106#ifndef TERMIO
107#undef	TERMIOS
108#define TERMIOS
109#endif
110
111#ifdef TERMIO
112#include <termio.h>
113#endif
114#ifdef TERMIOS
115#include <termios.h>
116#endif
117
118#define	STR_LEN	1024
119
120#ifndef SIGTYPE
121#define SIGTYPE void
122#endif
123
124#undef __P
125#undef __V
126
127#ifdef __STDC__
128#include <stdarg.h>
129#define __V(x)	x
130#define __P(x)	x
131#else
132#include <varargs.h>
133#define __V(x)	(va_alist) va_dcl
134#define __P(x)	()
135#define const
136#endif
137
138#ifndef O_NONBLOCK
139#define O_NONBLOCK	O_NDELAY
140#endif
141
142#ifdef SUNOS
143extern int sys_nerr;
144extern char *sys_errlist[];
145#define memmove(to, from, n)	bcopy(from, to, n)
146#define strerror(n)		((unsigned)(n) < sys_nerr? sys_errlist[(n)] :\
147				 "unknown error")
148#endif
149
150/*************** Micro getopt() *********************************************/
151#define	OPTION(c,v)	(_O&2&&**v?*(*v)++:!c||_O&4?0:(!(_O&1)&& \
152				(--c,++v),_O=4,c&&**v=='-'&&v[0][1]?*++*v=='-'\
153				&&!v[0][1]?(--c,++v,0):(_O=2,*(*v)++):0))
154#define	OPTARG(c,v)	(_O&2?**v||(++v,--c)?(_O=1,--c,*v++): \
155				(_O=4,(char*)0):(char*)0)
156#define	OPTONLYARG(c,v)	(_O&2&&**v?(_O=1,--c,*v++):(char*)0)
157#define	ARG(c,v)	(c?(--c,*v++):(char*)0)
158
159static int _O = 0;		/* Internal state */
160/*************** Micro getopt() *********************************************/
161
162char *program_name;
163
164#define	MAX_ABORTS		50
165#define	MAX_REPORTS		50
166#define	DEFAULT_CHAT_TIMEOUT	45
167
168int echo          = 0;
169int verbose       = 0;
170int to_log        = 1;
171int to_stderr     = 0;
172int Verbose       = 0;
173int quiet         = 0;
174int report        = 0;
175int use_env       = 0;
176int exit_code     = 0;
177FILE* report_fp   = (FILE *) 0;
178char *report_file = (char *) 0;
179char *chat_file   = (char *) 0;
180char *phone_num   = (char *) 0;
181char *phone_num2  = (char *) 0;
182int timeout       = DEFAULT_CHAT_TIMEOUT;
183
184int have_tty_parameters = 0;
185
186#ifdef TERMIO
187#define term_parms struct termio
188#define get_term_param(param) ioctl(0, TCGETA, param)
189#define set_term_param(param) ioctl(0, TCSETA, param)
190struct termio saved_tty_parameters;
191#endif
192
193#ifdef TERMIOS
194#define term_parms struct termios
195#define get_term_param(param) tcgetattr(0, param)
196#define set_term_param(param) tcsetattr(0, TCSANOW, param)
197struct termios saved_tty_parameters;
198#endif
199
200char *abort_string[MAX_ABORTS], *fail_reason = (char *)0,
201	fail_buffer[50];
202int n_aborts = 0, abort_next = 0, timeout_next = 0, echo_next = 0;
203int clear_abort_next = 0;
204
205char *report_string[MAX_REPORTS] ;
206char  report_buffer[50] ;
207int n_reports = 0, report_next = 0, report_gathering = 0 ;
208int clear_report_next = 0;
209
210int say_next = 0, hup_next = 0;
211
212void *dup_mem __P((void *b, size_t c));
213void *copy_of __P((char *s));
214void usage __P((void));
215void logf __P((const char *fmt, ...));
216void fatal __P((int code, const char *fmt, ...));
217SIGTYPE sigalrm __P((int signo));
218SIGTYPE sigint __P((int signo));
219SIGTYPE sigterm __P((int signo));
220SIGTYPE sighup __P((int signo));
221void unalarm __P((void));
222void init __P((void));
223void set_tty_parameters __P((void));
224void echo_stderr __P((int));
225void break_sequence __P((void));
226void terminate __P((int status));
227void do_file __P((char *chat_file));
228int  get_string __P((register char *string));
229int  put_string __P((register char *s));
230int  write_char __P((int c));
231int  put_char __P((int c));
232int  get_char __P((void));
233void chat_send __P((register char *s));
234char *character __P((int c));
235void chat_expect __P((register char *s));
236char *clean __P((register char *s, int sending));
237void break_sequence __P((void));
238void terminate __P((int status));
239void pack_array __P((char **array, int end));
240char *expect_strtok __P((char *, char *));
241int vfmtmsg __P((char *, int, const char *, va_list));	/* vsprintf++ */
242
243int main __P((int, char *[]));
244
245void *dup_mem(b, c)
246void *b;
247size_t c;
248{
249    void *ans = malloc (c);
250    if (!ans)
251	fatal(2, "memory error!");
252
253    memcpy (ans, b, c);
254    return ans;
255}
256
257void *copy_of (s)
258char *s;
259{
260    return dup_mem (s, strlen (s) + 1);
261}
262
263/*
264 * chat [ -v ] [ -E ] [ -T number ] [ -U number ] [ -t timeout ] [ -f chat-file ] \
265 * [ -r report-file ] \
266 *		[...[[expect[-say[-expect...]] say expect[-say[-expect]] ...]]]
267 *
268 *	Perform a UUCP-dialer-like chat script on stdin and stdout.
269 */
270int
271main(argc, argv)
272     int argc;
273     char **argv;
274{
275    int option;
276    char *arg;
277
278    program_name = *argv;
279    tzset();
280
281    while ((option = OPTION(argc, argv)) != 0) {
282	switch (option) {
283	case 'e':
284	    ++echo;
285	    break;
286
287	case 'E':
288	    ++use_env;
289	    break;
290
291	case 'v':
292	    ++verbose;
293	    break;
294
295	case 'V':
296	    ++Verbose;
297	    break;
298
299	case 's':
300	    ++to_stderr;
301	    break;
302
303	case 'S':
304	    to_log = 0;
305	    break;
306
307	case 'f':
308	    if ((arg = OPTARG(argc, argv)) != NULL)
309		    chat_file = copy_of(arg);
310	    else
311		usage();
312	    break;
313
314	case 't':
315	    if ((arg = OPTARG(argc, argv)) != NULL)
316		timeout = atoi(arg);
317	    else
318		usage();
319	    break;
320
321	case 'r':
322	    arg = OPTARG (argc, argv);
323	    if (arg) {
324		if (report_fp != NULL)
325		    fclose (report_fp);
326		report_file = copy_of (arg);
327		report_fp   = fopen (report_file, "a");
328		if (report_fp != NULL) {
329		    if (verbose)
330			fprintf (report_fp, "Opening \"%s\"...\n",
331				 report_file);
332		    report = 1;
333		}
334	    }
335	    break;
336
337	case 'T':
338	    if ((arg = OPTARG(argc, argv)) != NULL)
339		phone_num = copy_of(arg);
340	    else
341		usage();
342	    break;
343
344	case 'U':
345	    if ((arg = OPTARG(argc, argv)) != NULL)
346		phone_num2 = copy_of(arg);
347	    else
348		usage();
349	    break;
350
351	default:
352	    usage();
353	    break;
354	}
355    }
356/*
357 * Default the report file to the stderr location
358 */
359    if (report_fp == NULL)
360	report_fp = stderr;
361
362    if (to_log) {
363#ifdef ultrix
364	openlog("chat", LOG_PID);
365#else
366	openlog("chat", LOG_PID | LOG_NDELAY, LOG_LOCAL2);
367
368	if (verbose)
369	    setlogmask(LOG_UPTO(LOG_INFO));
370	else
371	    setlogmask(LOG_UPTO(LOG_WARNING));
372#endif
373    }
374
375    init();
376
377    if (chat_file != NULL) {
378	arg = ARG(argc, argv);
379	if (arg != NULL)
380	    usage();
381	else
382	    do_file (chat_file);
383    } else {
384	while ((arg = ARG(argc, argv)) != NULL) {
385	    chat_expect(arg);
386
387	    if ((arg = ARG(argc, argv)) != NULL)
388		chat_send(arg);
389	}
390    }
391
392    terminate(0);
393    return 0;
394}
395
396/*
397 *  Process a chat script when read from a file.
398 */
399
400void do_file (chat_file)
401char *chat_file;
402{
403    int linect, sendflg;
404    char *sp, *arg, quote;
405    char buf [STR_LEN];
406    FILE *cfp;
407
408    cfp = fopen (chat_file, "r");
409    if (cfp == NULL)
410	fatal(1, "%s -- open failed: %m", chat_file);
411
412    linect = 0;
413    sendflg = 0;
414
415    while (fgets(buf, STR_LEN, cfp) != NULL) {
416	sp = strchr (buf, '\n');
417	if (sp)
418	    *sp = '\0';
419
420	linect++;
421	sp = buf;
422
423        /* lines starting with '#' are comments. If a real '#'
424           is to be expected, it should be quoted .... */
425        if ( *sp == '#' )
426	    continue;
427
428	while (*sp != '\0') {
429	    if (*sp == ' ' || *sp == '\t') {
430		++sp;
431		continue;
432	    }
433
434	    if (*sp == '"' || *sp == '\'') {
435		quote = *sp++;
436		arg = sp;
437		while (*sp != quote) {
438		    if (*sp == '\0')
439			fatal(1, "unterminated quote (line %d)", linect);
440
441		    if (*sp++ == '\\') {
442			if (*sp != '\0')
443			    ++sp;
444		    }
445		}
446	    }
447	    else {
448		arg = sp;
449		while (*sp != '\0' && *sp != ' ' && *sp != '\t')
450		    ++sp;
451	    }
452
453	    if (*sp != '\0')
454		*sp++ = '\0';
455
456	    if (sendflg)
457		chat_send (arg);
458	    else
459		chat_expect (arg);
460	    sendflg = !sendflg;
461	}
462    }
463    fclose (cfp);
464}
465
466/*
467 *	We got an error parsing the command line.
468 */
469void usage()
470{
471    fprintf(stderr, "\
472Usage: %s [-e] [-E] [-v] [-V] [-t timeout] [-r report-file]\n\
473     [-T phone-number] [-U phone-number2] {-f chat-file | chat-script}\n", program_name);
474    exit(1);
475}
476
477char line[1024];
478
479/*
480 * Send a message to syslog and/or stderr.
481 */
482void logf __V((const char *fmt, ...))
483{
484    va_list args;
485
486#ifdef __STDC__
487    va_start(args, fmt);
488#else
489    char *fmt;
490    va_start(args);
491    fmt = va_arg(args, char *);
492#endif
493
494    vfmtmsg(line, sizeof(line), fmt, args);
495    if (to_log)
496	syslog(LOG_INFO, "%s", line);
497    if (to_stderr)
498	fprintf(stderr, "%s\n", line);
499}
500
501/*
502 *	Print an error message and terminate.
503 */
504
505void fatal __V((int code, const char *fmt, ...))
506{
507    va_list args;
508
509#ifdef __STDC__
510    va_start(args, fmt);
511#else
512    int code;
513    char *fmt;
514    va_start(args);
515    code = va_arg(args, int);
516    fmt = va_arg(args, char *);
517#endif
518
519    vfmtmsg(line, sizeof(line), fmt, args);
520    if (to_log)
521	syslog(LOG_ERR, "%s", line);
522    if (to_stderr)
523	fprintf(stderr, "%s\n", line);
524    terminate(code);
525}
526
527int alarmed = 0;
528
529SIGTYPE sigalrm(signo)
530int signo;
531{
532    int flags;
533
534    alarm(1);
535    alarmed = 1;		/* Reset alarm to avoid race window */
536    signal(SIGALRM, sigalrm);	/* that can cause hanging in read() */
537
538    if ((flags = fcntl(0, F_GETFL, 0)) == -1)
539	fatal(2, "Can't get file mode flags on stdin: %m");
540
541    if (fcntl(0, F_SETFL, flags | O_NONBLOCK) == -1)
542	fatal(2, "Can't set file mode flags on stdin: %m");
543
544    if (verbose)
545	logf("alarm");
546}
547
548void unalarm()
549{
550    int flags;
551
552    if ((flags = fcntl(0, F_GETFL, 0)) == -1)
553	fatal(2, "Can't get file mode flags on stdin: %m");
554
555    if (fcntl(0, F_SETFL, flags & ~O_NONBLOCK) == -1)
556	fatal(2, "Can't set file mode flags on stdin: %m");
557}
558
559SIGTYPE sigint(signo)
560int signo;
561{
562    fatal(2, "SIGINT");
563}
564
565SIGTYPE sigterm(signo)
566int signo;
567{
568    fatal(2, "SIGTERM");
569}
570
571SIGTYPE sighup(signo)
572int signo;
573{
574    fatal(2, "SIGHUP");
575}
576
577void init()
578{
579    signal(SIGINT, sigint);
580    signal(SIGTERM, sigterm);
581    signal(SIGHUP, sighup);
582
583    set_tty_parameters();
584    signal(SIGALRM, sigalrm);
585    alarm(0);
586    alarmed = 0;
587}
588
589void set_tty_parameters()
590{
591#if defined(get_term_param)
592    term_parms t;
593
594    if (get_term_param (&t) < 0)
595	fatal(2, "Can't get terminal parameters: %m");
596
597    saved_tty_parameters = t;
598    have_tty_parameters  = 1;
599
600    t.c_iflag     |= IGNBRK | ISTRIP | IGNPAR;
601    t.c_oflag      = 0;
602    t.c_lflag      = 0;
603    t.c_cc[VERASE] =
604    t.c_cc[VKILL]  = 0;
605    t.c_cc[VMIN]   = 1;
606    t.c_cc[VTIME]  = 0;
607
608    if (set_term_param (&t) < 0)
609	fatal(2, "Can't set terminal parameters: %m");
610#endif
611}
612
613void break_sequence()
614{
615#ifdef TERMIOS
616    tcsendbreak (0, 0);
617#endif
618}
619
620void terminate(status)
621int status;
622{
623    static int terminating = 0;
624
625    if (terminating)
626	exit(status);
627    terminating = 1;
628    echo_stderr(-1);
629/*
630 * Allow the last of the report string to be gathered before we terminate.
631 */
632    if (report_gathering) {
633	int c, rep_len;
634
635	rep_len = strlen(report_buffer);
636	while (rep_len + 1 <= sizeof(report_buffer)) {
637	    alarm(1);
638	    c = get_char();
639	    alarm(0);
640	    if (c < 0 || iscntrl(c))
641		break;
642	    report_buffer[rep_len] = c;
643	    ++rep_len;
644	}
645	report_buffer[rep_len] = 0;
646	fprintf (report_fp, "chat:  %s\n", report_buffer);
647    }
648    if (report_file != (char *) 0 && report_fp != (FILE *) NULL) {
649	if (verbose)
650	    fprintf (report_fp, "Closing \"%s\".\n", report_file);
651	fclose (report_fp);
652	report_fp = (FILE *) NULL;
653    }
654
655#if defined(get_term_param)
656    if (have_tty_parameters) {
657	if (set_term_param (&saved_tty_parameters) < 0)
658	    fatal(2, "Can't restore terminal parameters: %m");
659    }
660#endif
661
662    exit(status);
663}
664
665/*
666 *	'Clean up' this string.
667 */
668char *clean(s, sending)
669register char *s;
670int sending;  /* set to 1 when sending (putting) this string. */
671{
672    char temp[STR_LEN], env_str[STR_LEN], cur_chr;
673    register char *s1, *phchar;
674    int add_return = sending;
675#define isoctal(chr)	(((chr) >= '0') && ((chr) <= '7'))
676#define isalnumx(chr)	((((chr) >= '0') && ((chr) <= '9')) \
677			 || (((chr) >= 'a') && ((chr) <= 'z')) \
678			 || (((chr) >= 'A') && ((chr) <= 'Z')) \
679			 || (chr) == '_')
680
681    s1 = temp;
682    while (*s) {
683	cur_chr = *s++;
684	if (cur_chr == '^') {
685	    cur_chr = *s++;
686	    if (cur_chr == '\0') {
687		*s1++ = '^';
688		break;
689	    }
690	    cur_chr &= 0x1F;
691	    if (cur_chr != 0) {
692		*s1++ = cur_chr;
693	    }
694	    continue;
695	}
696
697	if (use_env && cur_chr == '$') {		/* ARI */
698	    phchar = env_str;
699	    while (isalnumx(*s))
700		*phchar++ = *s++;
701	    *phchar = '\0';
702	    phchar = getenv(env_str);
703	    if (phchar)
704		while (*phchar)
705		    *s1++ = *phchar++;
706	    continue;
707	}
708
709	if (cur_chr != '\\') {
710	    *s1++ = cur_chr;
711	    continue;
712	}
713
714	cur_chr = *s++;
715	if (cur_chr == '\0') {
716	    if (sending) {
717		*s1++ = '\\';
718		*s1++ = '\\';
719	    }
720	    break;
721	}
722
723	switch (cur_chr) {
724	case 'b':
725	    *s1++ = '\b';
726	    break;
727
728	case 'c':
729	    if (sending && *s == '\0')
730		add_return = 0;
731	    else
732		*s1++ = cur_chr;
733	    break;
734
735	case '\\':
736	case 'K':
737	case 'p':
738	case 'd':
739	    if (sending)
740		*s1++ = '\\';
741	    *s1++ = cur_chr;
742	    break;
743
744	case 'T':
745	    if (sending && phone_num) {
746		for (phchar = phone_num; *phchar != '\0'; phchar++)
747		    *s1++ = *phchar;
748	    }
749	    else {
750		*s1++ = '\\';
751		*s1++ = 'T';
752	    }
753	    break;
754
755	case 'U':
756	    if (sending && phone_num2) {
757		for (phchar = phone_num2; *phchar != '\0'; phchar++)
758		    *s1++ = *phchar;
759	    }
760	    else {
761		*s1++ = '\\';
762		*s1++ = 'U';
763	    }
764	    break;
765
766	case 'q':
767	    quiet = 1;
768	    break;
769
770	case 'r':
771	    *s1++ = '\r';
772	    break;
773
774	case 'n':
775	    *s1++ = '\n';
776	    break;
777
778	case 's':
779	    *s1++ = ' ';
780	    break;
781
782	case 't':
783	    *s1++ = '\t';
784	    break;
785
786	case 'N':
787	    if (sending) {
788		*s1++ = '\\';
789		*s1++ = '\0';
790	    }
791	    else
792		*s1++ = 'N';
793	    break;
794
795	case '$':			/* ARI */
796	    if (use_env) {
797		*s1++ = cur_chr;
798		break;
799	    }
800	    /* FALL THROUGH */
801
802	default:
803	    if (isoctal (cur_chr)) {
804		cur_chr &= 0x07;
805		if (isoctal (*s)) {
806		    cur_chr <<= 3;
807		    cur_chr |= *s++ - '0';
808		    if (isoctal (*s)) {
809			cur_chr <<= 3;
810			cur_chr |= *s++ - '0';
811		    }
812		}
813
814		if (cur_chr != 0 || sending) {
815		    if (sending && (cur_chr == '\\' || cur_chr == 0))
816			*s1++ = '\\';
817		    *s1++ = cur_chr;
818		}
819		break;
820	    }
821
822	    if (sending)
823		*s1++ = '\\';
824	    *s1++ = cur_chr;
825	    break;
826	}
827    }
828
829    if (add_return)
830	*s1++ = '\r';
831
832    *s1++ = '\0'; /* guarantee closure */
833    *s1++ = '\0'; /* terminate the string */
834    return dup_mem (temp, (size_t) (s1 - temp)); /* may have embedded nuls */
835}
836
837/*
838 * A modified version of 'strtok'. This version skips \ sequences.
839 */
840
841char *expect_strtok (s, term)
842     char *s, *term;
843{
844    static  char *str   = "";
845    int	    escape_flag = 0;
846    char   *result;
847
848/*
849 * If a string was specified then do initial processing.
850 */
851    if (s)
852	str = s;
853
854/*
855 * If this is the escape flag then reset it and ignore the character.
856 */
857    if (*str)
858	result = str;
859    else
860	result = (char *) 0;
861
862    while (*str) {
863	if (escape_flag) {
864	    escape_flag = 0;
865	    ++str;
866	    continue;
867	}
868
869	if (*str == '\\') {
870	    ++str;
871	    escape_flag = 1;
872	    continue;
873	}
874
875/*
876 * If this is not in the termination string, continue.
877 */
878	if (strchr (term, *str) == (char *) 0) {
879	    ++str;
880	    continue;
881	}
882
883/*
884 * This is the terminator. Mark the end of the string and stop.
885 */
886	*str++ = '\0';
887	break;
888    }
889    return (result);
890}
891
892/*
893 * Process the expect string
894 */
895
896void chat_expect (s)
897char *s;
898{
899    char *expect;
900    char *reply;
901
902    if (strcmp(s, "HANGUP") == 0) {
903	++hup_next;
904        return;
905    }
906
907    if (strcmp(s, "ABORT") == 0) {
908	++abort_next;
909	return;
910    }
911
912    if (strcmp(s, "CLR_ABORT") == 0) {
913	++clear_abort_next;
914	return;
915    }
916
917    if (strcmp(s, "REPORT") == 0) {
918	++report_next;
919	return;
920    }
921
922    if (strcmp(s, "CLR_REPORT") == 0) {
923	++clear_report_next;
924	return;
925    }
926
927    if (strcmp(s, "TIMEOUT") == 0) {
928	++timeout_next;
929	return;
930    }
931
932    if (strcmp(s, "ECHO") == 0) {
933	++echo_next;
934	return;
935    }
936
937    if (strcmp(s, "SAY") == 0) {
938	++say_next;
939	return;
940    }
941
942/*
943 * Fetch the expect and reply string.
944 */
945    for (;;) {
946	expect = expect_strtok (s, "-");
947	s      = (char *) 0;
948
949	if (expect == (char *) 0)
950	    return;
951
952	reply = expect_strtok (s, "-");
953
954/*
955 * Handle the expect string. If successful then exit.
956 */
957	if (get_string (expect))
958	    return;
959
960/*
961 * If there is a sub-reply string then send it. Otherwise any condition
962 * is terminal.
963 */
964	if (reply == (char *) 0 || exit_code != 3)
965	    break;
966
967	chat_send (reply);
968    }
969
970/*
971 * The expectation did not occur. This is terminal.
972 */
973    if (fail_reason)
974	logf("Failed (%s)", fail_reason);
975    else
976	logf("Failed");
977    terminate(exit_code);
978}
979
980/*
981 * Translate the input character to the appropriate string for printing
982 * the data.
983 */
984
985char *character(c)
986int c;
987{
988    static char string[10];
989    char *meta;
990
991    meta = (c & 0x80) ? "M-" : "";
992    c &= 0x7F;
993
994    if (c < 32)
995	sprintf(string, "%s^%c", meta, (int)c + '@');
996    else if (c == 127)
997	sprintf(string, "%s^?", meta);
998    else
999	sprintf(string, "%s%c", meta, c);
1000
1001    return (string);
1002}
1003
1004/*
1005 *  process the reply string
1006 */
1007void chat_send (s)
1008register char *s;
1009{
1010    char file_data[STR_LEN];
1011
1012    if (say_next) {
1013	say_next = 0;
1014	s = clean(s, 1);
1015	write(2, s, strlen(s));
1016        free(s);
1017	return;
1018    }
1019
1020    if (hup_next) {
1021        hup_next = 0;
1022	if (strcmp(s, "OFF") == 0)
1023           signal(SIGHUP, SIG_IGN);
1024        else
1025           signal(SIGHUP, sighup);
1026        return;
1027    }
1028
1029    if (echo_next) {
1030	echo_next = 0;
1031	echo = (strcmp(s, "ON") == 0);
1032	return;
1033    }
1034
1035    if (abort_next) {
1036	char *s1;
1037
1038	abort_next = 0;
1039
1040	if (n_aborts >= MAX_ABORTS)
1041	    fatal(2, "Too many ABORT strings");
1042
1043	s1 = clean(s, 0);
1044
1045	if (strlen(s1) > strlen(s)
1046	    || strlen(s1) + 1 > sizeof(fail_buffer))
1047	    fatal(1, "Illegal or too-long ABORT string ('%v')", s);
1048
1049	abort_string[n_aborts++] = s1;
1050
1051	if (verbose)
1052	    logf("abort on (%v)", s);
1053	return;
1054    }
1055
1056    if (clear_abort_next) {
1057	char *s1;
1058	int   i;
1059        int   old_max;
1060	int   pack = 0;
1061
1062	clear_abort_next = 0;
1063
1064	s1 = clean(s, 0);
1065
1066	if (strlen(s1) > strlen(s)
1067	    || strlen(s1) + 1 > sizeof(fail_buffer))
1068	    fatal(1, "Illegal or too-long CLR_ABORT string ('%v')", s);
1069
1070        old_max = n_aborts;
1071	for (i=0; i < n_aborts; i++) {
1072	    if ( strcmp(s1,abort_string[i]) == 0 ) {
1073		free(abort_string[i]);
1074		abort_string[i] = NULL;
1075		pack++;
1076		n_aborts--;
1077		if (verbose)
1078		    logf("clear abort on (%v)", s);
1079	    }
1080	}
1081        free(s1);
1082	if (pack)
1083	    pack_array(abort_string,old_max);
1084	return;
1085    }
1086
1087    if (report_next) {
1088	char *s1;
1089
1090	report_next = 0;
1091	if (n_reports >= MAX_REPORTS)
1092	    fatal(2, "Too many REPORT strings");
1093
1094	s1 = clean(s, 0);
1095
1096	if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1)
1097	    fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1098
1099	report_string[n_reports++] = s1;
1100
1101	if (verbose)
1102	    logf("report (%v)", s);
1103	return;
1104    }
1105
1106    if (clear_report_next) {
1107	char *s1;
1108	int   i;
1109	int   old_max;
1110	int   pack = 0;
1111
1112	clear_report_next = 0;
1113
1114	s1 = clean(s, 0);
1115
1116	if (strlen(s1) > strlen(s) || strlen(s1) > sizeof fail_buffer - 1)
1117	    fatal(1, "Illegal or too-long REPORT string ('%v')", s);
1118
1119	old_max = n_reports;
1120	for (i=0; i < n_reports; i++) {
1121	    if ( strcmp(s1,report_string[i]) == 0 ) {
1122		free(report_string[i]);
1123		report_string[i] = NULL;
1124		pack++;
1125		n_reports--;
1126		if (verbose)
1127		    logf("clear report (%v)", s);
1128	    }
1129	}
1130        free(s1);
1131        if (pack)
1132	    pack_array(report_string,old_max);
1133
1134	return;
1135    }
1136
1137    if (timeout_next) {
1138	timeout_next = 0;
1139	timeout = atoi(s);
1140
1141	if (timeout <= 0)
1142	    timeout = DEFAULT_CHAT_TIMEOUT;
1143
1144	if (verbose)
1145	    logf("timeout set to %d seconds", timeout);
1146
1147	return;
1148    }
1149
1150    /*
1151     * The syntax @filename means read the string to send from the
1152     * file `filename'.
1153     */
1154    if (s[0] == '@') {
1155	/* skip the @ and any following white-space */
1156	char *fn = s;
1157	while (*++fn == ' ' || *fn == '\t')
1158	    ;
1159
1160	if (*fn != 0) {
1161	    FILE *f;
1162	    int n = 0;
1163
1164	    /* open the file and read until STR_LEN-1 bytes or end-of-file */
1165	    f = fopen(fn, "r");
1166	    if (f == NULL)
1167		fatal(1, "%s -- open failed: %m", fn);
1168	    while (n < STR_LEN - 1) {
1169		int nr = fread(&file_data[n], 1, STR_LEN - 1 - n, f);
1170		if (nr < 0)
1171		    fatal(1, "%s -- read error", fn);
1172		if (nr == 0)
1173		    break;
1174		n += nr;
1175	    }
1176	    fclose(f);
1177
1178	    /* use the string we got as the string to send,
1179	       but trim off the final newline if any. */
1180	    if (n > 0 && file_data[n-1] == '\n')
1181		--n;
1182	    file_data[n] = 0;
1183	    s = file_data;
1184	}
1185    }
1186
1187    if (strcmp(s, "EOT") == 0)
1188	s = "^D\\c";
1189    else if (strcmp(s, "BREAK") == 0)
1190	s = "\\K\\c";
1191
1192    if (!put_string(s))
1193	fatal(1, "Failed");
1194}
1195
1196int get_char()
1197{
1198    int status;
1199    char c;
1200
1201    status = read(0, &c, 1);
1202
1203    switch (status) {
1204    case 1:
1205	return ((int)c & 0x7F);
1206
1207    default:
1208	logf("warning: read() on stdin returned %d", status);
1209	/* FALLTHROUGH */
1210
1211    case -1:
1212	if ((status = fcntl(0, F_GETFL, 0)) == -1)
1213	    fatal(2, "Can't get file mode flags on stdin: %m");
1214
1215	if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1216	    fatal(2, "Can't set file mode flags on stdin: %m");
1217
1218	return (-1);
1219    }
1220}
1221
1222int put_char(c)
1223int c;
1224{
1225    int status;
1226    char ch = c;
1227
1228    usleep(10000);		/* inter-character typing delay (?) */
1229
1230    status = write(1, &ch, 1);
1231
1232    switch (status) {
1233    case 1:
1234	return (0);
1235
1236    default:
1237	logf("warning: write() on stdout returned %d", status);
1238	/* FALLTHROUGH */
1239
1240    case -1:
1241	if ((status = fcntl(0, F_GETFL, 0)) == -1)
1242	    fatal(2, "Can't get file mode flags on stdin, %m");
1243
1244	if (fcntl(0, F_SETFL, status & ~O_NONBLOCK) == -1)
1245	    fatal(2, "Can't set file mode flags on stdin: %m");
1246
1247	return (-1);
1248    }
1249}
1250
1251int write_char (c)
1252int c;
1253{
1254    if (alarmed || put_char(c) < 0) {
1255	alarm(0);
1256	alarmed = 0;
1257
1258	if (verbose) {
1259	    if (errno == EINTR || errno == EWOULDBLOCK)
1260		logf(" -- write timed out");
1261	    else
1262		logf(" -- write failed: %m");
1263	}
1264	return (0);
1265    }
1266    return (1);
1267}
1268
1269int put_string (s)
1270register char *s;
1271{
1272    quiet = 0;
1273    s = clean(s, 1);
1274
1275    if (verbose) {
1276	if (quiet)
1277	    logf("send (??????)");
1278	else
1279	    logf("send (%v)", s);
1280    }
1281
1282    alarm(timeout); alarmed = 0;
1283
1284    while (*s) {
1285	register char c = *s++;
1286
1287	if (c != '\\') {
1288	    if (!write_char (c))
1289		return 0;
1290	    continue;
1291	}
1292
1293	c = *s++;
1294	switch (c) {
1295	case 'd':
1296	    sleep(1);
1297	    break;
1298
1299	case 'K':
1300	    break_sequence();
1301	    break;
1302
1303	case 'p':
1304	    usleep(10000); 	/* 1/100th of a second (arg is microseconds) */
1305	    break;
1306
1307	default:
1308	    if (!write_char (c))
1309		return 0;
1310	    break;
1311	}
1312    }
1313
1314    alarm(0);
1315    alarmed = 0;
1316    return (1);
1317}
1318
1319/*
1320 *	Echo a character to stderr.
1321 *	When called with -1, a '\n' character is generated when
1322 *	the cursor is not at the beginning of a line.
1323 */
1324void echo_stderr(n)
1325int n;
1326{
1327    static int need_lf;
1328    char *s;
1329
1330    switch (n) {
1331    case '\r':		/* ignore '\r' */
1332	break;
1333    case -1:
1334	if (need_lf == 0)
1335	    break;
1336	/* fall through */
1337    case '\n':
1338	write(2, "\n", 1);
1339	need_lf = 0;
1340	break;
1341    default:
1342	s = character(n);
1343	write(2, s, strlen(s));
1344	need_lf = 1;
1345	break;
1346    }
1347}
1348
1349/*
1350 *	'Wait for' this string to appear on this file descriptor.
1351 */
1352int get_string(string)
1353register char *string;
1354{
1355    char temp[STR_LEN];
1356    int c, printed = 0, len, minlen;
1357    register char *s = temp, *end = s + STR_LEN;
1358    char *logged = temp;
1359
1360    fail_reason = (char *)0;
1361    string = clean(string, 0);
1362    len = strlen(string);
1363    minlen = (len > sizeof(fail_buffer)? len: sizeof(fail_buffer)) - 1;
1364
1365    if (verbose)
1366	logf("expect (%v)", string);
1367
1368    if (len > STR_LEN) {
1369	logf("expect string is too long");
1370	exit_code = 1;
1371	return 0;
1372    }
1373
1374    if (len == 0) {
1375	if (verbose)
1376	    logf("got it");
1377	return (1);
1378    }
1379
1380    alarm(timeout);
1381    alarmed = 0;
1382
1383    while ( ! alarmed && (c = get_char()) >= 0) {
1384	int n, abort_len, report_len;
1385
1386	if (echo)
1387	    echo_stderr(c);
1388	if (verbose && c == '\n') {
1389	    if (s == logged)
1390		logf("");	/* blank line */
1391	    else
1392		logf("%0.*v", s - logged, logged);
1393	    logged = s + 1;
1394	}
1395
1396	*s++ = c;
1397
1398	if (verbose && s >= logged + 80) {
1399	    logf("%0.*v", s - logged, logged);
1400	    logged = s;
1401	}
1402
1403	if (Verbose) {
1404	   if (c == '\n')
1405	       fputc( '\n', stderr );
1406	   else if (c != '\r')
1407	       fprintf( stderr, "%s", character(c) );
1408	}
1409
1410	if (!report_gathering) {
1411	    for (n = 0; n < n_reports; ++n) {
1412		if ((report_string[n] != (char*) NULL) &&
1413		    s - temp >= (report_len = strlen(report_string[n])) &&
1414		    strncmp(s - report_len, report_string[n], report_len) == 0) {
1415		    time_t time_now   = time ((time_t*) NULL);
1416		    struct tm* tm_now = localtime (&time_now);
1417
1418		    strftime (report_buffer, 20, "%b %d %H:%M:%S ", tm_now);
1419		    strcat (report_buffer, report_string[n]);
1420
1421		    report_string[n] = (char *) NULL;
1422		    report_gathering = 1;
1423		    break;
1424		}
1425	    }
1426	}
1427	else {
1428	    if (!iscntrl (c)) {
1429		int rep_len = strlen (report_buffer);
1430		report_buffer[rep_len]     = c;
1431		report_buffer[rep_len + 1] = '\0';
1432	    }
1433	    else {
1434		report_gathering = 0;
1435		fprintf (report_fp, "chat:  %s\n", report_buffer);
1436	    }
1437	}
1438
1439	if (s - temp >= len &&
1440	    c == string[len - 1] &&
1441	    strncmp(s - len, string, len) == 0) {
1442	    if (verbose) {
1443		if (s > logged)
1444		    logf("%0.*v", s - logged, logged);
1445		logf(" -- got it\n");
1446	    }
1447
1448	    alarm(0);
1449	    alarmed = 0;
1450	    return (1);
1451	}
1452
1453	for (n = 0; n < n_aborts; ++n) {
1454	    if (s - temp >= (abort_len = strlen(abort_string[n])) &&
1455		strncmp(s - abort_len, abort_string[n], abort_len) == 0) {
1456		if (verbose) {
1457		    if (s > logged)
1458			logf("%0.*v", s - logged, logged);
1459		    logf(" -- failed");
1460		}
1461
1462		alarm(0);
1463		alarmed = 0;
1464		exit_code = n + 4;
1465		strcpy(fail_reason = fail_buffer, abort_string[n]);
1466		return (0);
1467	    }
1468	}
1469
1470	if (s >= end) {
1471	    if (logged < s - minlen) {
1472		if (verbose)
1473		    logf("%0.*v", s - logged, logged);
1474		logged = s;
1475	    }
1476	    s -= minlen;
1477	    memmove(temp, s, minlen);
1478	    logged = temp + (logged - s);
1479	    s = temp + minlen;
1480	}
1481
1482	if (alarmed && verbose)
1483	    logf("warning: alarm synchronization problem");
1484    }
1485
1486    alarm(0);
1487
1488    if (verbose && printed) {
1489	if (alarmed)
1490	    logf(" -- read timed out");
1491	else
1492	    logf(" -- read failed: %m");
1493    }
1494
1495    exit_code = 3;
1496    alarmed   = 0;
1497    return (0);
1498}
1499
1500/*
1501 * Gross kludge to handle Solaris versions >= 2.6 having usleep.
1502 */
1503#ifdef SOL2
1504#include <sys/param.h>
1505#if MAXUID > 65536		/* then this is Solaris 2.6 or later */
1506#undef NO_USLEEP
1507#endif
1508#endif /* SOL2 */
1509
1510#ifdef NO_USLEEP
1511#include <sys/types.h>
1512#include <sys/time.h>
1513
1514/*
1515  usleep -- support routine for 4.2BSD system call emulations
1516  last edit:  29-Oct-1984     D A Gwyn
1517  */
1518
1519extern int	  select();
1520
1521int
1522usleep( usec )				  /* returns 0 if ok, else -1 */
1523    long		usec;		/* delay in microseconds */
1524{
1525    static struct {		/* `timeval' */
1526	long	tv_sec;		/* seconds */
1527	long	tv_usec;	/* microsecs */
1528    } delay;	    		/* _select() timeout */
1529
1530    delay.tv_sec  = usec / 1000000L;
1531    delay.tv_usec = usec % 1000000L;
1532
1533    return select(0, (long *)0, (long *)0, (long *)0, &delay);
1534}
1535#endif
1536
1537void
1538pack_array (array, end)
1539    char **array; /* The address of the array of string pointers */
1540    int    end;   /* The index of the next free entry before CLR_ */
1541{
1542    int i, j;
1543
1544    for (i = 0; i < end; i++) {
1545	if (array[i] == NULL) {
1546	    for (j = i+1; j < end; ++j)
1547		if (array[j] != NULL)
1548		    array[i++] = array[j];
1549	    for (; i < end; ++i)
1550		array[i] = NULL;
1551	    break;
1552	}
1553    }
1554}
1555
1556/*
1557 * vfmtmsg - format a message into a buffer.  Like vsprintf except we
1558 * also specify the length of the output buffer, and we handle the
1559 * %m (error message) format.
1560 * Doesn't do floating-point formats.
1561 * Returns the number of chars put into buf.
1562 */
1563#define OUTCHAR(c)	(buflen > 0? (--buflen, *buf++ = (c)): 0)
1564
1565int
1566vfmtmsg(buf, buflen, fmt, args)
1567    char *buf;
1568    int buflen;
1569    const char *fmt;
1570    va_list args;
1571{
1572    int c, i, n;
1573    int width, prec, fillch;
1574    int base, len, neg, quoted;
1575    unsigned long val = 0;
1576    char *str, *buf0;
1577    const char *f;
1578    unsigned char *p;
1579    char num[32];
1580    static char hexchars[] = "0123456789abcdef";
1581
1582    buf0 = buf;
1583    --buflen;
1584    while (buflen > 0) {
1585	for (f = fmt; *f != '%' && *f != 0; ++f)
1586	    ;
1587	if (f > fmt) {
1588	    len = f - fmt;
1589	    if (len > buflen)
1590		len = buflen;
1591	    memcpy(buf, fmt, len);
1592	    buf += len;
1593	    buflen -= len;
1594	    fmt = f;
1595	}
1596	if (*fmt == 0)
1597	    break;
1598	c = *++fmt;
1599	width = prec = 0;
1600	fillch = ' ';
1601	if (c == '0') {
1602	    fillch = '0';
1603	    c = *++fmt;
1604	}
1605	if (c == '*') {
1606	    width = va_arg(args, int);
1607	    c = *++fmt;
1608	} else {
1609	    while (isdigit(c)) {
1610		width = width * 10 + c - '0';
1611		c = *++fmt;
1612	    }
1613	}
1614	if (c == '.') {
1615	    c = *++fmt;
1616	    if (c == '*') {
1617		prec = va_arg(args, int);
1618		c = *++fmt;
1619	    } else {
1620		while (isdigit(c)) {
1621		    prec = prec * 10 + c - '0';
1622		    c = *++fmt;
1623		}
1624	    }
1625	}
1626	str = 0;
1627	base = 0;
1628	neg = 0;
1629	++fmt;
1630	switch (c) {
1631	case 'd':
1632	    i = va_arg(args, int);
1633	    if (i < 0) {
1634		neg = 1;
1635		val = -i;
1636	    } else
1637		val = i;
1638	    base = 10;
1639	    break;
1640	case 'o':
1641	    val = va_arg(args, unsigned int);
1642	    base = 8;
1643	    break;
1644	case 'x':
1645	    val = va_arg(args, unsigned int);
1646	    base = 16;
1647	    break;
1648	case 'p':
1649	    val = (unsigned long) va_arg(args, void *);
1650	    base = 16;
1651	    neg = 2;
1652	    break;
1653	case 's':
1654	    str = va_arg(args, char *);
1655	    break;
1656	case 'c':
1657	    num[0] = va_arg(args, int);
1658	    num[1] = 0;
1659	    str = num;
1660	    break;
1661	case 'm':
1662	    str = strerror(errno);
1663	    break;
1664	case 'v':		/* "visible" string */
1665	case 'q':		/* quoted string */
1666	    quoted = c == 'q';
1667	    p = va_arg(args, unsigned char *);
1668	    if (fillch == '0' && prec > 0) {
1669		n = prec;
1670	    } else {
1671		n = strlen((char *)p);
1672		if (prec > 0 && prec < n)
1673		    n = prec;
1674	    }
1675	    while (n > 0 && buflen > 0) {
1676		c = *p++;
1677		--n;
1678		if (!quoted && c >= 0x80) {
1679		    OUTCHAR('M');
1680		    OUTCHAR('-');
1681		    c -= 0x80;
1682		}
1683		if (quoted && (c == '"' || c == '\\'))
1684		    OUTCHAR('\\');
1685		if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1686		    if (quoted) {
1687			OUTCHAR('\\');
1688			switch (c) {
1689			case '\t':	OUTCHAR('t');	break;
1690			case '\n':	OUTCHAR('n');	break;
1691			case '\b':	OUTCHAR('b');	break;
1692			case '\f':	OUTCHAR('f');	break;
1693			default:
1694			    OUTCHAR('x');
1695			    OUTCHAR(hexchars[c >> 4]);
1696			    OUTCHAR(hexchars[c & 0xf]);
1697			}
1698		    } else {
1699			if (c == '\t')
1700			    OUTCHAR(c);
1701			else {
1702			    OUTCHAR('^');
1703			    OUTCHAR(c ^ 0x40);
1704			}
1705		    }
1706		} else
1707		    OUTCHAR(c);
1708	    }
1709	    continue;
1710	default:
1711	    *buf++ = '%';
1712	    if (c != '%')
1713		--fmt;		/* so %z outputs %z etc. */
1714	    --buflen;
1715	    continue;
1716	}
1717	if (base != 0) {
1718	    str = num + sizeof(num);
1719	    *--str = 0;
1720	    while (str > num + neg) {
1721		*--str = hexchars[val % base];
1722		val = val / base;
1723		if (--prec <= 0 && val == 0)
1724		    break;
1725	    }
1726	    switch (neg) {
1727	    case 1:
1728		*--str = '-';
1729		break;
1730	    case 2:
1731		*--str = 'x';
1732		*--str = '0';
1733		break;
1734	    }
1735	    len = num + sizeof(num) - 1 - str;
1736	} else {
1737	    len = strlen(str);
1738	    if (prec > 0 && len > prec)
1739		len = prec;
1740	}
1741	if (width > 0) {
1742	    if (width > buflen)
1743		width = buflen;
1744	    if ((n = width - len) > 0) {
1745		buflen -= n;
1746		for (; n > 0; --n)
1747		    *buf++ = fillch;
1748	    }
1749	}
1750	if (len > buflen)
1751	    len = buflen;
1752	memcpy(buf, str, len);
1753	buf += len;
1754	buflen -= len;
1755    }
1756    *buf = 0;
1757    return buf - buf0;
1758}
1759