1 /*
2 * Copyright (c) 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * %sccs.include.redist.c%
6 */
7
8 #ifndef lint
9 static char sccsid[] = "@(#)courier.c 8.1 (Berkeley) 06/06/93";
10 #endif /* not lint */
11
12 /*
13 * Routines for calling up on a Courier modem.
14 * Derived from Hayes driver.
15 */
16 #include "tip.h"
17 #include <stdio.h>
18
19 #define MAXRETRY 5
20
21 static void sigALRM();
22 static int timeout = 0;
23 static int connected = 0;
24 static jmp_buf timeoutbuf, intbuf;
25 static int coursync();
26
cour_dialer(num,acu)27 cour_dialer(num, acu)
28 register char *num;
29 char *acu;
30 {
31 register char *cp;
32 #ifdef ACULOG
33 char line[80];
34 #endif
35 static int cour_connect(), cour_swallow();
36
37 if (boolean(value(VERBOSE)))
38 printf("Using \"%s\"\n", acu);
39
40 ioctl(FD, TIOCHPCL, 0);
41 /*
42 * Get in synch.
43 */
44 if (!coursync()) {
45 badsynch:
46 printf("can't synchronize with courier\n");
47 #ifdef ACULOG
48 logent(value(HOST), num, "courier", "can't synch up");
49 #endif
50 return (0);
51 }
52 cour_write(FD, "AT E0\r", 6); /* turn off echoing */
53 sleep(1);
54 #ifdef DEBUG
55 if (boolean(value(VERBOSE)))
56 cour_verbose_read();
57 #endif
58 ioctl(FD, TIOCFLUSH, 0); /* flush any clutter */
59 cour_write(FD, "AT C1 E0 H0 Q0 X6 V1\r", 21);
60 if (!cour_swallow("\r\nOK\r\n"))
61 goto badsynch;
62 fflush(stdout);
63 cour_write(FD, "AT D", 4);
64 for (cp = num; *cp; cp++)
65 if (*cp == '=')
66 *cp = ',';
67 cour_write(FD, num, strlen(num));
68 cour_write(FD, "\r", 1);
69 connected = cour_connect();
70 #ifdef ACULOG
71 if (timeout) {
72 sprintf(line, "%d second dial timeout",
73 number(value(DIALTIMEOUT)));
74 logent(value(HOST), num, "cour", line);
75 }
76 #endif
77 if (timeout)
78 cour_disconnect();
79 return (connected);
80 }
81
cour_disconnect()82 cour_disconnect()
83 {
84 /* first hang up the modem*/
85 ioctl(FD, TIOCCDTR, 0);
86 sleep(1);
87 ioctl(FD, TIOCSDTR, 0);
88 coursync(); /* reset */
89 close(FD);
90 }
91
cour_abort()92 cour_abort()
93 {
94 cour_write(FD, "\r", 1); /* send anything to abort the call */
95 cour_disconnect();
96 }
97
98 static void
sigALRM()99 sigALRM()
100 {
101 printf("\07timeout waiting for reply\n");
102 timeout = 1;
103 longjmp(timeoutbuf, 1);
104 }
105
106 static int
cour_swallow(match)107 cour_swallow(match)
108 register char *match;
109 {
110 sig_t f;
111 char c;
112
113 f = signal(SIGALRM, sigALRM);
114 timeout = 0;
115 do {
116 if (*match =='\0') {
117 signal(SIGALRM, f);
118 return (1);
119 }
120 if (setjmp(timeoutbuf)) {
121 signal(SIGALRM, f);
122 return (0);
123 }
124 alarm(number(value(DIALTIMEOUT)));
125 read(FD, &c, 1);
126 alarm(0);
127 c &= 0177;
128 #ifdef DEBUG
129 if (boolean(value(VERBOSE)))
130 putchar(c);
131 #endif
132 } while (c == *match++);
133 #ifdef DEBUG
134 if (boolean(value(VERBOSE)))
135 fflush(stdout);
136 #endif
137 signal(SIGALRM, SIG_DFL);
138 return (0);
139 }
140
141 struct baud_msg {
142 char *msg;
143 int baud;
144 } baud_msg[] = {
145 "", B300,
146 " 1200", B1200,
147 " 2400", B2400,
148 " 9600", B9600,
149 " 9600/ARQ", B9600,
150 0, 0,
151 };
152
153 static int
cour_connect()154 cour_connect()
155 {
156 char c;
157 int nc, nl, n;
158 struct sgttyb sb;
159 char dialer_buf[64];
160 struct baud_msg *bm;
161 sig_t f;
162
163 if (cour_swallow("\r\n") == 0)
164 return (0);
165 f = signal(SIGALRM, sigALRM);
166 again:
167 nc = 0; nl = sizeof(dialer_buf)-1;
168 bzero(dialer_buf, sizeof(dialer_buf));
169 timeout = 0;
170 for (nc = 0, nl = sizeof(dialer_buf)-1 ; nl > 0 ; nc++, nl--) {
171 if (setjmp(timeoutbuf))
172 break;
173 alarm(number(value(DIALTIMEOUT)));
174 n = read(FD, &c, 1);
175 alarm(0);
176 if (n <= 0)
177 break;
178 c &= 0x7f;
179 if (c == '\r') {
180 if (cour_swallow("\n") == 0)
181 break;
182 if (!dialer_buf[0])
183 goto again;
184 if (strcmp(dialer_buf, "RINGING") == 0 &&
185 boolean(value(VERBOSE))) {
186 #ifdef DEBUG
187 printf("%s\r\n", dialer_buf);
188 #endif
189 goto again;
190 }
191 if (strncmp(dialer_buf, "CONNECT",
192 sizeof("CONNECT")-1) != 0)
193 break;
194 for (bm = baud_msg ; bm->msg ; bm++)
195 if (strcmp(bm->msg,
196 dialer_buf+sizeof("CONNECT")-1) == 0) {
197 if (ioctl(FD, TIOCGETP, &sb) < 0) {
198 perror("TIOCGETP");
199 goto error;
200 }
201 sb.sg_ispeed = sb.sg_ospeed = bm->baud;
202 if (ioctl(FD, TIOCSETP, &sb) < 0) {
203 perror("TIOCSETP");
204 goto error;
205 }
206 signal(SIGALRM, f);
207 #ifdef DEBUG
208 if (boolean(value(VERBOSE)))
209 printf("%s\r\n", dialer_buf);
210 #endif
211 return (1);
212 }
213 break;
214 }
215 dialer_buf[nc] = c;
216 #ifdef notdef
217 if (boolean(value(VERBOSE)))
218 putchar(c);
219 #endif
220 }
221 error1:
222 printf("%s\r\n", dialer_buf);
223 error:
224 signal(SIGALRM, f);
225 return (0);
226 }
227
228 /*
229 * This convoluted piece of code attempts to get
230 * the courier in sync.
231 */
232 static int
coursync()233 coursync()
234 {
235 int already = 0;
236 int len;
237 char buf[40];
238
239 while (already++ < MAXRETRY) {
240 ioctl(FD, TIOCFLUSH, 0); /* flush any clutter */
241 cour_write(FD, "\rAT Z\r", 6); /* reset modem */
242 bzero(buf, sizeof(buf));
243 sleep(1);
244 ioctl(FD, FIONREAD, &len);
245 if (len) {
246 len = read(FD, buf, sizeof(buf));
247 #ifdef DEBUG
248 buf[len] = '\0';
249 printf("coursync: (\"%s\")\n\r", buf);
250 #endif
251 if (index(buf, '0') ||
252 (index(buf, 'O') && index(buf, 'K')))
253 return(1);
254 }
255 /*
256 * If not strapped for DTR control,
257 * try to get command mode.
258 */
259 sleep(1);
260 cour_write(FD, "+++", 3);
261 sleep(1);
262 /*
263 * Toggle DTR to force anyone off that might have left
264 * the modem connected.
265 */
266 ioctl(FD, TIOCCDTR, 0);
267 sleep(1);
268 ioctl(FD, TIOCSDTR, 0);
269 }
270 cour_write(FD, "\rAT Z\r", 6);
271 return (0);
272 }
273
cour_write(fd,cp,n)274 cour_write(fd, cp, n)
275 int fd;
276 char *cp;
277 int n;
278 {
279 struct sgttyb sb;
280 #ifdef notdef
281 if (boolean(value(VERBOSE)))
282 write(1, cp, n);
283 #endif
284 ioctl(fd, TIOCGETP, &sb);
285 ioctl(fd, TIOCSETP, &sb);
286 cour_nap();
287 for ( ; n-- ; cp++) {
288 write(fd, cp, 1);
289 ioctl(fd, TIOCGETP, &sb);
290 ioctl(fd, TIOCSETP, &sb);
291 cour_nap();
292 }
293 }
294
295 #ifdef DEBUG
cour_verbose_read()296 cour_verbose_read()
297 {
298 int n = 0;
299 char buf[BUFSIZ];
300
301 if (ioctl(FD, FIONREAD, &n) < 0)
302 return;
303 if (n <= 0)
304 return;
305 if (read(FD, buf, n) != n)
306 return;
307 write(1, buf, n);
308 }
309 #endif
310
311 /*
312 * Code stolen from /usr/src/lib/libc/gen/sleep.c
313 */
314 #define mask(s) (1<<((s)-1))
315 #define setvec(vec, a) \
316 vec.sv_handler = a; vec.sv_mask = vec.sv_onstack = 0
317
318 static napms = 50; /* Give the courier 50 milliseconds between characters */
319
320 static int ringring;
321
cour_nap()322 cour_nap()
323 {
324
325 static void cour_napx();
326 int omask;
327 struct itimerval itv, oitv;
328 register struct itimerval *itp = &itv;
329 struct sigvec vec, ovec;
330
331 timerclear(&itp->it_interval);
332 timerclear(&itp->it_value);
333 if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
334 return;
335 setvec(ovec, SIG_DFL);
336 omask = sigblock(mask(SIGALRM));
337 itp->it_value.tv_sec = napms/1000;
338 itp->it_value.tv_usec = ((napms%1000)*1000);
339 setvec(vec, cour_napx);
340 ringring = 0;
341 (void) sigvec(SIGALRM, &vec, &ovec);
342 (void) setitimer(ITIMER_REAL, itp, (struct itimerval *)0);
343 while (!ringring)
344 sigpause(omask &~ mask(SIGALRM));
345 (void) sigvec(SIGALRM, &ovec, (struct sigvec *)0);
346 (void) setitimer(ITIMER_REAL, &oitv, (struct itimerval *)0);
347 (void) sigsetmask(omask);
348 }
349
350 static void
cour_napx()351 cour_napx()
352 {
353 ringring = 1;
354 }
355