1 /*
2 * Copyright (c) 1983, 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[] = "@(#)ventel.c 8.1 (Berkeley) 06/06/93";
10 #endif /* not lint */
11
12 /*
13 * Routines for calling up on a Ventel Modem
14 * The Ventel is expected to be strapped for local echo (just like uucp)
15 */
16 #include "tip.h"
17
18 #define MAXRETRY 5
19
20 static void sigALRM();
21 static int timeout = 0;
22 static jmp_buf timeoutbuf;
23
24 /*
25 * some sleep calls have been replaced by this macro
26 * because some ventel modems require two <cr>s in less than
27 * a second in order to 'wake up'... yes, it is dirty...
28 */
29 #define delay(num,denom) busyloop(CPUSPEED*num/denom)
30 #define CPUSPEED 1000000 /* VAX 780 is 1MIPS */
31 #define DELAY(n) { register long N = (n); while (--N > 0); }
busyloop(n)32 busyloop(n) { DELAY(n); }
33
ven_dialer(num,acu)34 ven_dialer(num, acu)
35 register char *num;
36 char *acu;
37 {
38 register char *cp;
39 register int connected = 0;
40 char *msg, *index(), line[80];
41 static int gobble(), vensync();
42 static void echo();
43
44 /*
45 * Get in synch with a couple of carriage returns
46 */
47 if (!vensync(FD)) {
48 printf("can't synchronize with ventel\n");
49 #ifdef ACULOG
50 logent(value(HOST), num, "ventel", "can't synch up");
51 #endif
52 return (0);
53 }
54 if (boolean(value(VERBOSE)))
55 printf("\ndialing...");
56 fflush(stdout);
57 ioctl(FD, TIOCHPCL, 0);
58 echo("#k$\r$\n$D$I$A$L$:$ ");
59 for (cp = num; *cp; cp++) {
60 delay(1, 10);
61 write(FD, cp, 1);
62 }
63 delay(1, 10);
64 write(FD, "\r", 1);
65 gobble('\n', line);
66 if (gobble('\n', line))
67 connected = gobble('!', line);
68 ioctl(FD, TIOCFLUSH);
69 #ifdef ACULOG
70 if (timeout) {
71 sprintf(line, "%d second dial timeout",
72 number(value(DIALTIMEOUT)));
73 logent(value(HOST), num, "ventel", line);
74 }
75 #endif
76 if (timeout)
77 ven_disconnect(); /* insurance */
78 if (connected || timeout || !boolean(value(VERBOSE)))
79 return (connected);
80 /* call failed, parse response for user */
81 cp = index(line, '\r');
82 if (cp)
83 *cp = '\0';
84 for (cp = line; cp = index(cp, ' '); cp++)
85 if (cp[1] == ' ')
86 break;
87 if (cp) {
88 while (*cp == ' ')
89 cp++;
90 msg = cp;
91 while (*cp) {
92 if (isupper(*cp))
93 *cp = tolower(*cp);
94 cp++;
95 }
96 printf("%s...", msg);
97 }
98 return (connected);
99 }
100
ven_disconnect()101 ven_disconnect()
102 {
103
104 close(FD);
105 }
106
ven_abort()107 ven_abort()
108 {
109
110 write(FD, "\03", 1);
111 close(FD);
112 }
113
114 static void
echo(s)115 echo(s)
116 register char *s;
117 {
118 char c;
119
120 while (c = *s++) switch (c) {
121
122 case '$':
123 read(FD, &c, 1);
124 s++;
125 break;
126
127 case '#':
128 c = *s++;
129 write(FD, &c, 1);
130 break;
131
132 default:
133 write(FD, &c, 1);
134 read(FD, &c, 1);
135 }
136 }
137
138 static void
sigALRM()139 sigALRM()
140 {
141 printf("\07timeout waiting for reply\n");
142 timeout = 1;
143 longjmp(timeoutbuf, 1);
144 }
145
146 static int
gobble(match,response)147 gobble(match, response)
148 register char match;
149 char response[];
150 {
151 register char *cp = response;
152 sig_t f;
153 char c;
154
155 f = signal(SIGALRM, sigALRM);
156 timeout = 0;
157 do {
158 if (setjmp(timeoutbuf)) {
159 signal(SIGALRM, f);
160 *cp = '\0';
161 return (0);
162 }
163 alarm(number(value(DIALTIMEOUT)));
164 read(FD, cp, 1);
165 alarm(0);
166 c = (*cp++ &= 0177);
167 #ifdef notdef
168 if (boolean(value(VERBOSE)))
169 putchar(c);
170 #endif
171 } while (c != '\n' && c != match);
172 signal(SIGALRM, SIG_DFL);
173 *cp = '\0';
174 return (c == match);
175 }
176
177 #define min(a,b) ((a)>(b)?(b):(a))
178 /*
179 * This convoluted piece of code attempts to get
180 * the ventel in sync. If you don't have FIONREAD
181 * there are gory ways to simulate this.
182 */
183 static int
vensync(fd)184 vensync(fd)
185 {
186 int already = 0, nread;
187 char buf[60];
188
189 /*
190 * Toggle DTR to force anyone off that might have left
191 * the modem connected, and insure a consistent state
192 * to start from.
193 *
194 * If you don't have the ioctl calls to diddle directly
195 * with DTR, you can always try setting the baud rate to 0.
196 */
197 ioctl(FD, TIOCCDTR, 0);
198 sleep(1);
199 ioctl(FD, TIOCSDTR, 0);
200 while (already < MAXRETRY) {
201 /*
202 * After reseting the modem, send it two \r's to
203 * autobaud on. Make sure to delay between them
204 * so the modem can frame the incoming characters.
205 */
206 write(fd, "\r", 1);
207 delay(1,10);
208 write(fd, "\r", 1);
209 sleep(2);
210 if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) {
211 perror("tip: ioctl");
212 continue;
213 }
214 while (nread > 0) {
215 read(fd, buf, min(nread, 60));
216 if ((buf[nread - 1] & 0177) == '$')
217 return (1);
218 nread -= min(nread, 60);
219 }
220 sleep(1);
221 already++;
222 }
223 return (0);
224 }
225
226