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/*

 *      Chat -- a program for automatic session establishment (i.e. dial

 *              the phone and log in).

 *

 * Standard termination codes:

 *  0 - successful completion of the script

 *  1 - invalid argument, expect string too large, etc.

 *  2 - error on an I/O operation or fatal error condition.

 *  3 - timeout waiting for a simple string.

 *  4 - the first string declared as "ABORT"

 *  5 - the second string declared as "ABORT"

 *  6 - ... and so on for successive ABORT strings.

 *

 *      This software is in the public domain.

 *

 * -----------------

 *      added -T and -U option and \T and \U substitution to pass a phone

 *      number into chat script. Two are needed for some ISDN TA applications.

 *      Keith Dart <kdart@cisco.com>

 *

 *

 *      Added SAY keyword to send output to stderr.

 *      This allows to turn ECHO OFF and to output specific, user selected,

 *      text to give progress messages. This best works when stderr

 *      exists (i.e.: pppd in nodetach mode).

 *

 *      Added HANGUP directives to allow for us to be called

 *      back. When HANGUP is set to NO, chat will not hangup at HUP signal.

 *      We rely on timeouts in that case.

 *

 *      Added CLR_ABORT to clear previously set ABORT string. This has been

 *      dictated by the HANGUP above as "NO CARRIER" (for example) must be

 *      an ABORT condition until we know the other host is going to close

 *      the connection for call back. As soon as we have completed the

 *      first stage of the call back sequence, "NO CARRIER" is a valid, non

 *      fatal string. As soon as we got called back (probably get "CONNECT"),

 *      we should re-arm the ABORT "NO CARRIER". Hence the CLR_ABORT command.

 *      Note that CLR_ABORT packs the abort_strings[] array so that we do not

 *      have unused entries not being reclaimed.

 *

 *      In the same vein as above, added CLR_REPORT keyword.

 *

 *      Allow for comments. Line starting with '#' are comments and are

 *      ignored. If a '#' is to be expected as the first character, the

 *      expect string must be quoted.

 *

 *

 *              Francis Demierre <Francis@SwissMail.Com>

 *              Thu May 15 17:15:40 MET DST 1997

 *

 *

 *      Added -r "report file" switch & REPORT keyword.

 *              Robert Geer <bgeer@xmission.com>

 *

 *      Added -s "use stderr" and -S "don't use syslog" switches.

 *              June 18, 1997

 *              Karl O. Pinc <kop@meme.com>

 *

 *

 *      Added -e "echo" switch & ECHO keyword

 *              Dick Streefland <dicks@tasking.nl>

 *

 *

 *      Considerable updates and modifications by

 *              Al Longyear <longyear@pobox.com>

 *              Paul Mackerras <paulus@cs.anu.edu.au>

 *

 *

 *      The original author is:

 *

 *              Karl Fox <karl@MorningStar.Com>

 *              Morning Star Technologies, Inc.

 *              1760 Zollinger Road

 *              Columbus, OH  43221

 *              (614)451-1883

 *

 *

 */

#ifndef lint

/* static char rcsid[] = ""; */

#endif

#include <stdio.h>

#include <ctype.h>

#include <time.h>

#include <fcntl.h>

#include <signal.h>

#include <errno.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <syslog.h>

#undef  TERMIOS

#define TERMIOS

#include <termios.h>

#define STR_LEN 1024

char temp2[STR_LEN];

#ifndef SIGTYPE

#define SIGTYPE void

#endif

#undef __P

#undef __V

#ifdef __STDC__

#include <stdarg.h>

#define __V(x)  x

#define __P(x)  x

#else

#include <varargs.h>

#define __V(x)  (va_alist) va_dcl

#define __P(x)  ()

#define const

#endif

#ifndef O_NONBLOCK

#define O_NONBLOCK      O_NDELAY

#endif

/*************** Micro getopt() *********************************************/

#define OPTION(c,v)     (_O&2&&**v?*(*v)++:!c||_O&4?0:(!(_O&1)&& \

                                (--c,++v),_O=4,c&&**v=='-'&&v[0][1]?*++*v=='-'\

                                &&!v[0][1]?(--c,++v,0):(_O=2,*(*v)++):0))

#define OPTARG(c,v)     (_O&2?**v||(++v,--c)?(_O=1,--c,*v++): \

                                (_O=4,(char*)0):(char*)0)

#define OPTONLYARG(c,v) (_O&2&&**v?(_O=1,--c,*v++):(char*)0)

#define ARG(c,v)        (c?(--c,*v++):(char*)0)

#if 0

static int _O = 0;               /* Internal state */

#endif

/*************** Micro getopt() *********************************************/

char *program_name;

#define MAX_ABORTS              5

#define MAX_REPORTS             5

#define DEFAULT_CHAT_TIMEOUT    45

#define fcntl(a, b,c ) 0

#define MAX_TIMEOUTS 10

int echo          = 0;

int verbose       = 0;

int to_log        = 1;

int to_stderr     = 0;

int Verbose       = 0;

int quiet         = 0;

int report        = 0;

int exit_code     = 0;

static int speed=0;

char *report_file = (char *) 0;

char *chat_file   = (char *) 0;

char *phone_num   = (char *) 0;

char *phone_num2  = (char *) 0;

int chat_timeout       = DEFAULT_CHAT_TIMEOUT;

static int timeout       = DEFAULT_CHAT_TIMEOUT;

int have_tty_parameters = 0;

#ifdef TERMIOS

#define term_parms struct termios

#define get_term_param(param) tcgetattr(modem_fd, param)

#define set_term_param(param) tcsetattr(modem_fd, TCSANOW, param)

struct termios saved_tty_parameters;

#endif

char *abort_string[MAX_ABORTS]={"BUSY","NO DIALTONE","NO CARRIER","NO ASWER","RINGING\r\n\r\nRINGING"};

char *fail_reason = (char *)0,

        fail_buffer[50];

int n_aborts = MAX_ABORTS, abort_next = 0, timeout_next = 0, echo_next = 0;

int clear_abort_next = 0;

char *report_string[MAX_REPORTS] ;

char  report_buffer[50] ;

int n_reports = 0, report_next = 0, report_gathering = 0 ;

int clear_report_next = 0;

int say_next = 0, hup_next = 0;

void *dup_mem __P((void *b, size_t c));

void *copy_of __P((char *s));

/*

SIGTYPE sigalrm __P((int signo));

SIGTYPE sigint __P((int signo));

SIGTYPE sigterm __P((int signo));

SIGTYPE sighup __P((int signo));

*/

void unalarm __P((void));

void init __P((void));

void set_tty_parameters __P((void));

void echo_stderr __P((int));

void break_sequence __P((void));

void terminate __P((int status));

void do_file __P((char *chat_file));

int  get_string __P((register char *string));

int  put_string __P((register char *s));

int  write_char __P((int c));

int  put_char __P((int c));

int  get_char __P((void));

void chat_send __P((register char *s));

char *character __P((int c));

void chat_expect __P((register char *s));

char *clean __P((register char *s, int sending));

void break_sequence __P((void));

void terminate __P((int status));

void pack_array __P((char **array, int end));

char *expect_strtok __P((char *, char *));

int vfmtmsg __P((char *, int, const char *, va_list));  /* vsprintf++ */

#if 0

int usleep( long usec );                                  /* returns 0 if ok, else -1 */

#endif

extern int input_fd,output_fd;

int main __P((int, char *[]));

void *dup_mem(b, c)

void *b;

size_t c;

{

    void *ans = malloc (c);

    if (!ans)

                return NULL;

    memcpy (ans, b, c);

    return ans;

}

void *copy_of (s)

char *s;

{

    return dup_mem (s, strlen (s) + 1);

}

/*

 * chat [ -v ] [-T number] [-U number] [ -t timeout ] [ -f chat-file ] \

 * [ -r report-file ] \

 *              [...[[expect[-say[-expect...]] say expect[-say[-expect]] ...]]]

 *

 *      Perform a UUCP-dialer-like chat script on stdin and stdout.

 */

char *getnextcommand(char **string)

{

        char *buf=*string,*res;

        res=strchr(buf,'@');

        if (res==NULL)

                return NULL;

        *res='\0';

        *string=res+1;

        return buf;

}

extern int modem_fd;

int

        chatmain(argv)

     char *argv;

{

    char *arg;

        int i;

        char *t;

        exit_code=0;

        speed=0;

/*

 * Default the report file to the stderr location

 */

/*    if (report_fp == NULL)

        report_fp = stderr;

*/

    init();

        while ( (arg = getnextcommand(&argv)) != NULL) {

            chat_expect(arg);

                if (exit_code>0) break;

            t=temp2;

                while(*t)

                {

                        if (strncmp("CARRIER",t,7)==0)

                        {/* parse speed information */

                                i=0;

                                while(!isdigit(t[i]))

                                        i++;

                                t=&t[i];

                                i=0;

                                while(isdigit(t[i]))

                                        i++;

                                t[i]=0;

                                sscanf(t,"%d",&speed);

                                break;

                        }

                        t++;

                }

            if ((arg = getnextcommand(&argv)) != NULL)

                chat_send(arg);

                if (exit_code>0) break;

        }

    if (exit_code) return exit_code;

    return -speed;

}

/*

 *      Print an error message and terminate.

 */

void init()

{

    set_tty_parameters();

        speed=0;

}

void set_tty_parameters()

{

    term_parms t;

        if (get_term_param (&t) < 0)

                syslog(LOG_NOTICE,"Can't get terminal parameters:")

                ;

    saved_tty_parameters = t;

    have_tty_parameters  = 1;

    t.c_iflag     |= IGNBRK | ISTRIP | IGNPAR;

    t.c_oflag      = 0;

    t.c_lflag      = 0;

    t.c_cc[VERASE] =

    t.c_cc[VKILL]  = 0;

    t.c_cc[VMIN]   = 0;

    t.c_cc[VTIME]  = 1;

    if (set_term_param (&t) < 0)

                syslog(LOG_NOTICE,"Can't set terminal parameters:")

                ;

}

void break_sequence()

{

/*    tcsendbreak (0, 0);*/

}

/*void terminate(status)

int status;

{

    echo_stderr(-1);

    if (have_tty_parameters) {

        if (set_term_param (&saved_tty_parameters) < 0)

            fatal(2, "Can't restore terminal parameters: %m");

    }

}

*/

/*

 *      'Clean up' this string.

 */

char *clean(s, sending)

register char *s;

int sending;  /* set to 1 when sending (putting) this string. */

{

    char temp[STR_LEN], cur_chr;

    register char *s1, *phchar;

    int add_return = sending;

#define isoctal(chr) (((chr) >= '0') && ((chr) <= '7'))

    s1 = temp;

    while (*s) {

        cur_chr = *s++;

        if (cur_chr == '^') {

            cur_chr = *s++;

            if (cur_chr == '\0') {

                *s1++ = '^';

                break;

            }

            cur_chr &= 0x1F;

            if (cur_chr != 0) {

                *s1++ = cur_chr;

            }

            continue;

        }

        if (cur_chr != '\\') {

            *s1++ = cur_chr;

            continue;

        }

        cur_chr = *s++;

        if (cur_chr == '\0') {

            if (sending) {

                *s1++ = '\\';

                *s1++ = '\\';

            }

            break;

        }

        switch (cur_chr) {

        case 'b':

            *s1++ = '\b';

            break;

        case 'c':

            if (sending && *s == '\0')

                add_return = 0;

            else

                *s1++ = cur_chr;

            break;

        case '\\':

        case 'K':

        case 'p':

        case 'd':

            if (sending)

                *s1++ = '\\';

            *s1++ = cur_chr;

            break;

        case 'T':

            if (sending && phone_num) {

                for ( phchar = phone_num; *phchar != '\0'; phchar++)

                    *s1++ = *phchar;

            }

            else {

                *s1++ = '\\';

                *s1++ = 'T';

            }

            break;

        case 'U':

            if (sending && phone_num2) {

                for ( phchar = phone_num2; *phchar != '\0'; phchar++)

                    *s1++ = *phchar;

            }

            else {

                *s1++ = '\\';

                *s1++ = 'U';

            }

            break;

        case 'q':

            quiet = 1;

            break;

        case 'r':

            *s1++ = '\r';

            break;

        case 'n':

            *s1++ = '\n';

            break;

        case 's':

            *s1++ = ' ';

            break;

        case 't':

            *s1++ = '\t';

            break;

        case 'N':

            if (sending) {

                *s1++ = '\\';

                *s1++ = '\0';

            }

            else

                *s1++ = 'N';

            break;

        default:

            if (isoctal (cur_chr)) {

                cur_chr &= 0x07;

                if (isoctal (*s)) {

                    cur_chr <<= 3;

                    cur_chr |= *s++ - '0';

                    if (isoctal (*s)) {

                        cur_chr <<= 3;

                        cur_chr |= *s++ - '0';

                    }

                }

                if (cur_chr != 0 || sending) {

                    if (sending && (cur_chr == '\\' || cur_chr == 0))

                        *s1++ = '\\';

                    *s1++ = cur_chr;

                }

                break;

            }

            if (sending)

                *s1++ = '\\';

            *s1++ = cur_chr;

            break;

        }

    }

    if (add_return)

        *s1++ = '\r';

    *s1++ = '\0'; /* guarantee closure */

    *s1++ = '\0'; /* terminate the string */

    return dup_mem (temp, (size_t) (s1 - temp)); /* may have embedded nuls */

}

/*

 * A modified version of 'strtok'. This version skips \ sequences.

 */

char *expect_strtok (s, term)

     char *s, *term;

{

    static  char *str   = "";

    int     escape_flag = 0;

    char   *result;

/*

 * If a string was specified then do initial processing.

 */

    if (s)

        str = s;

/*

 * If this is the escape flag then reset it and ignore the character.

 */

    if (*str)

        result = str;

    else

        result = (char *) 0;

    while (*str) {

        if (escape_flag) {

            escape_flag = 0;

            ++str;

            continue;

        }

        if (*str == '\\') {

            ++str;

            escape_flag = 1;

            continue;

        }

/*

 * If this is not in the termination string, continue.

 */

        if (strchr (term, *str) == (char *) 0) {

            ++str;

            continue;

        }

/*

 * This is the terminator. Mark the end of the string and stop.

 */

        *str++ = '\0';

        break;

    }

    return (result);

}

/*

 * Process the expect string

 */

void   chat_expect (s)

char *s;

{

    char *expect;

    char *reply;

    if (strcmp(s, "HANGUP") == 0) {

        ++hup_next;

        return ;

    }

    if (strcmp(s, "ABORT") == 0) {

        ++abort_next;

        return ;

    }

    if (strcmp(s, "CLR_ABORT") == 0) {

        ++clear_abort_next;

        return ;

    }

    if (strcmp(s, "REPORT") == 0) {

        ++report_next;

        return ;

    }

    if (strcmp(s, "CLR_REPORT") == 0) {

        ++clear_report_next;

        return ;

    }

    if (strcmp(s, "TIMEOUT") == 0) {

        ++timeout_next;

        return ;

    }

    if (strcmp(s, "ECHO") == 0) {

        ++echo_next;

        return ;

    }

    if (strcmp(s, "SAY") == 0) {

        ++say_next;

        return ;

    }

/*

 * Fetch the expect and reply string.

 */

    for (;;) {

        expect = expect_strtok (s, "-");

        s      = (char *)0 ;

        if (expect == (char *) 0)

            return ;

        reply = expect_strtok (s, "-");

/*

 * Handle the expect string. If successful then exit.

 */

        if (get_string (expect))

            return;

/*

 * If there is a sub-reply string then send it. Otherwise any condition

 * is terminal.

 */

        if (reply == (char *) 0 || exit_code != 3)

            break;

        chat_send (reply);

    }

/*

 * The expectation did not occur. This is terminal.

 */

    return ;

}

/*

 *  process the reply string

 */

void chat_send (s)

register char *s;

{

    if (say_next) {

        say_next = 0;

        s = clean(s,0);

        write(modem_fd, s, strlen(s));

        free(s);

        return;

    }

    if (hup_next) {

        hup_next = 0;

    }

    if (echo_next) {

        echo_next = 0;

        echo = (strcmp(s, "ON") == 0);

        return;

    }

    if (abort_next) {

        /* char *s1; */

           ;

        return;

    }

/*    if (report_next) {

        char *s1;

        report_next = 0;

        if (n_reports >= MAX_REPORTS)

            {

              exit_code=2;

              return;

            }