usr.bin/tip/libacu/hayes.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)hayes.c  8.1 (Berkeley) 6/6/93
  34  */
  35
  36 /*
  37  * Routines for calling up on a Hayes Modem
  38  * (based on the old VenTel driver).
  39  * The modem is expected to be strapped for "echo".
  40  * Also, the switches enabling the DTR and CD lines
  41  * must be set correctly.
  42  * NOTICE:
  43  * The easy way to hang up a modem is always simply to
  44  * clear the DTR signal. However, if the +++ sequence
  45  * (which switches the modem back to local mode) is sent
  46  * before modem is hung up, removal of the DTR signal
  47  * has no effect (except that it prevents the modem from
  48  * recognizing commands).
  49  * (by Helge Skrivervik, Calma Company, Sunnyvale, CA. 1984)
  50  */
  51 /*
  52  * TODO:
  53  * It is probably not a good idea to switch the modem
  54  * state between 'verbose' and terse (status messages).
  55  * This should be kicked out and we should use verbose
  56  * mode only. This would make it consistent with normal
  57  * interactive use thru the command 'tip dialer'.
  58  */
  59 #include "tipconf.h"
  60 #include "tip.h"
  61
  62 #define min(a,b)        ((a < b) ? a : b)
  63
  64 static  void sigALRM();
  65 static  int timeout = 0;
  66 static  jmp_buf timeoutbuf;
  67 static  char gobble();
  68 #define DUMBUFLEN       40
  69 static char dumbuf[DUMBUFLEN];
  70
  71 #define DIALING         1
  72 #define IDLE            2
  73 #define CONNECTED       3
  74 #define FAILED          4
  75 static  int state = IDLE;
  76
  77 hay_dialer(num, acu)
  78         register char *num;
  79         char *acu;
  80 {
  81         register char *cp;
  82         register int connected = 0;
  83         char dummy;
  84 #if ACULOG
  85         char line[80];
  86 #endif
  87         if (hay_sync() == 0)            /* make sure we can talk to the modem */
  88                 return(0);
  89         if (boolean(value(VERBOSE)))
  90                 printf("\ndialing...");
  91         fflush(stdout);
  92         acu_hupcl ();
  93         acu_flush ();
  94         write(FD, "ATv0\r", 5); /* tell modem to use short status codes */
  95         gobble("\r");
  96         gobble("\r");
  97         write(FD, "ATTD", 4);   /* send dial command */
  98         write(FD, num, strlen(num));
  99         state = DIALING;
 100         write(FD, "\r", 1);
 101         connected = 0;
 102         if (gobble("\r")) {
 103                 if ((dummy = gobble("01234")) != '1')
 104                         error_rep(dummy);
 105                 else
 106                         connected = 1;
 107         }
 108         if (connected)
 109                 state = CONNECTED;
 110         else {
 111                 state = FAILED;
 112                 return (connected);     /* lets get out of here.. */
 113         }
 114         ioctl(FD, TIOCFLUSH, 0);
 115 #if ACULOG
 116         if (timeout) {
 117                 sprintf(line, "%d second dial timeout",
 118                         number(value(DIALTIMEOUT)));
 119                 logent(value(HOST), num, "hayes", line);
 120         }
 121 #endif
 122         if (timeout)
 123                 hay_disconnect();       /* insurance */
 124         return (connected);
 125 }
 126
 127
 128 hay_disconnect()
 129 {
 130         char c;
 131         int len, rlen;
 132
 133         /* first hang up the modem*/
 134 #ifdef DEBUG
 135         printf("\rdisconnecting modem....\n\r");
 136 #endif
 137         ioctl(FD, TIOCCDTR, 0);
 138         sleep(1);
 139         ioctl(FD, TIOCSDTR, 0);
 140         goodbye();
 141 }
 142
 143 hay_abort()
 144 {
 145
 146         char c;
 147
 148         write(FD, "\r", 1);     /* send anything to abort the call */
 149         hay_disconnect();
 150 }
 151
 152 static void
 153 sigALRM()
 154 {
 155
 156         printf("\07timeout waiting for reply\n\r");
 157         timeout = 1;
 158         longjmp(timeoutbuf, 1);
 159 }
 160
 161 static char
 162 gobble(match)
 163         register char *match;
 164 {
 165         char c;
 166         sig_t f;
 167         int i, status = 0;
 168
 169         f = signal(SIGALRM, sigALRM);
 170         timeout = 0;
 171 #ifdef DEBUG
 172         printf("\ngobble: waiting for %s\n", match);
 173 #endif
 174         do {
 175                 if (setjmp(timeoutbuf)) {
 176                         signal(SIGALRM, f);
 177                         return (0);
 178                 }
 179                 alarm(number(value(DIALTIMEOUT)));
 180                 read(FD, &c, 1);
 181                 alarm(0);
 182                 c &= 0177;
 183 #ifdef DEBUG
 184                 printf("%c 0x%x ", c, c);
 185 #endif
 186                 for (i = 0; i < strlen(match); i++)
 187                         if (c == match[i])
 188                                 status = c;
 189         } while (status == 0);
 190         signal(SIGALRM, SIG_DFL);
 191 #ifdef DEBUG
 192         printf("\n");
 193 #endif
 194         return (status);
 195 }
 196
 197 error_rep(c)
 198         register char c;
 199 {
 200         printf("\n\r");
 201         switch (c) {
 202
 203         case '0':
 204                 printf("OK");
 205                 break;
 206
 207         case '1':
 208                 printf("CONNECT");
 209                 break;
 210
 211         case '2':
 212                 printf("RING");
 213                 break;
 214
 215         case '3':
 216                 printf("NO CARRIER");
 217                 break;
 218
 219         case '4':
 220                 printf("ERROR in input");
 221                 break;
 222
 223         case '5':
 224                 printf("CONNECT 1200");
 225                 break;
 226
 227         default:
 228                 printf("Unknown Modem error: %c (0x%x)", c, c);
 229         }
 230         printf("\n\r");
 231         return;
 232 }
 233
 234 /*
 235  * set modem back to normal verbose status codes.
 236  */
 237 goodbye()
 238 {
 239         int len, rlen;
 240         char c;
 241
 242         ioctl(FD, TIOCFLUSH, &len);     /* get rid of trash */
 243         if (hay_sync()) {
 244                 sleep(1);
 245 #ifndef DEBUG
 246                 ioctl(FD, TIOCFLUSH, 0);
 247 #endif
 248                 write(FD, "ATH0\r", 5);         /* insurance */
 249 #ifndef DEBUG
 250                 c = gobble("03");
 251                 if (c != '0' && c != '3') {
 252                         printf("cannot hang up modem\n\r");
 253                         printf("please use 'tip dialer' to make sure the line is hung up\n\r");
 254                 }
 255 #endif
 256                 sleep(1);
 257                 ioctl(FD, FIONREAD, &len);
 258 #ifdef DEBUG
 259                 printf("goodbye1: len=%d -- ", len);
 260                 rlen = read(FD, dumbuf, min(len, DUMBUFLEN));
 261                 dumbuf[rlen] = '\0';
 262                 printf("read (%d): %s\r\n", rlen, dumbuf);
 263 #endif
 264                 write(FD, "ATv1\r", 5);
 265                 sleep(1);
 266 #ifdef DEBUG
 267                 ioctl(FD, FIONREAD, &len);
 268                 printf("goodbye2: len=%d -- ", len);
 269                 rlen = read(FD, dumbuf, min(len, DUMBUFLEN));
 270                 dumbuf[rlen] = '\0';
 271                 printf("read (%d): %s\r\n", rlen, dumbuf);
 272 #endif
 273         }
 274         ioctl(FD, TIOCFLUSH, 0);        /* clear the input buffer */
 275         ioctl(FD, TIOCCDTR, 0);         /* clear DTR (insurance) */
 276         close(FD);
 277 }
 278
 279 #define MAXRETRY        5
 280
 281 hay_sync()
 282 {
 283         int len, retry = 0;
 284
 285         while (retry++ <= MAXRETRY) {
 286                 write(FD, "AT\r", 3);
 287                 sleep(1);
 288                 ioctl(FD, FIONREAD, &len);
 289                 if (len) {
 290                         len = read(FD, dumbuf, min(len, DUMBUFLEN));
 291                         if (index(dumbuf, '0') ||
 292                         (index(dumbuf, 'O') && index(dumbuf, 'K')))
 293                                 return(1);
 294 #ifdef DEBUG
 295                         dumbuf[len] = '\0';
 296                         printf("hay_sync: (\"%s\") %d\n\r", dumbuf, retry);
 297 #endif
 298                 }
 299                 ioctl(FD, TIOCCDTR, 0);
 300                 ioctl(FD, TIOCSDTR, 0);
 301         }
 302         printf("Cannot synchronize with hayes...\n\r");
 303         return(0);
 304 }