1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 */ 6 7 #ifndef lint 8 static char sccsid[] = "@(#)ventel.c 5.1 (Berkeley) 04/30/85"; 9 #endif not lint 10 11 /* 12 * Routines for calling up on a Ventel Modem 13 * The Ventel is expected to be strapped for local echo (just like uucp) 14 */ 15 #include "tip.h" 16 17 #define MAXRETRY 5 18 19 static int sigALRM(); 20 static int timeout = 0; 21 static jmp_buf timeoutbuf; 22 23 /* 24 * some sleep calls have been replaced by this macro 25 * because some ventel modems require two <cr>s in less than 26 * a second in order to 'wake up'... yes, it is dirty... 27 */ 28 #define delay(num,denom) busyloop(CPUSPEED*num/denom) 29 #define CPUSPEED 1000000 /* VAX 780 is 1MIPS */ 30 #define DELAY(n) { register long N = (n); while (--N > 0); } 31 busyloop(n) { DELAY(n); } 32 33 ven_dialer(num, acu) 34 register char *num; 35 char *acu; 36 { 37 register char *cp; 38 register int connected = 0; 39 char *msg, *index(), line[80]; 40 41 /* 42 * Get in synch with a couple of carriage returns 43 */ 44 if (!vensync(FD)) { 45 printf("can't synchronize with ventel\n"); 46 #ifdef ACULOG 47 logent(value(HOST), num, "ventel", "can't synch up"); 48 #endif 49 return (0); 50 } 51 if (boolean(value(VERBOSE))) 52 printf("\ndialing..."); 53 fflush(stdout); 54 ioctl(FD, TIOCHPCL, 0); 55 echo("#k$\r$\n$D$I$A$L$:$ "); 56 for (cp = num; *cp; cp++) { 57 delay(1, 10); 58 write(FD, cp, 1); 59 } 60 delay(1, 10); 61 write(FD, "\r", 1); 62 gobble('\n', line); 63 if (gobble('\n', line)) 64 connected = gobble('!', line); 65 ioctl(FD, TIOCFLUSH); 66 #ifdef ACULOG 67 if (timeout) { 68 sprintf(line, "%d second dial timeout", 69 number(value(DIALTIMEOUT))); 70 logent(value(HOST), num, "ventel", line); 71 } 72 #endif 73 if (timeout) 74 ven_disconnect(); /* insurance */ 75 if (connected || timeout || !boolean(value(VERBOSE))) 76 return (connected); 77 /* call failed, parse response for user */ 78 cp = index(line, '\r'); 79 if (cp) 80 *cp = '\0'; 81 for (cp = line; cp = index(cp, ' '); cp++) 82 if (cp[1] == ' ') 83 break; 84 if (cp) { 85 while (*cp == ' ') 86 cp++; 87 msg = cp; 88 while (*cp) { 89 if (isupper(*cp)) 90 *cp = tolower(*cp); 91 cp++; 92 } 93 printf("%s...", msg); 94 } 95 return (connected); 96 } 97 98 ven_disconnect() 99 { 100 101 close(FD); 102 } 103 104 ven_abort() 105 { 106 107 write(FD, "\03", 1); 108 close(FD); 109 } 110 111 static int 112 echo(s) 113 register char *s; 114 { 115 char c; 116 117 while (c = *s++) switch (c) { 118 119 case '$': 120 read(FD, &c, 1); 121 s++; 122 break; 123 124 case '#': 125 c = *s++; 126 write(FD, &c, 1); 127 break; 128 129 default: 130 write(FD, &c, 1); 131 read(FD, &c, 1); 132 } 133 } 134 135 static int 136 sigALRM() 137 { 138 139 printf("\07timeout waiting for reply\n"); 140 timeout = 1; 141 longjmp(timeoutbuf, 1); 142 } 143 144 static int 145 gobble(match, response) 146 register char match; 147 char response[]; 148 { 149 register char *cp = response; 150 char c; 151 int (*f)(); 152 153 signal(SIGALRM, sigALRM); 154 timeout = 0; 155 do { 156 if (setjmp(timeoutbuf)) { 157 signal(SIGALRM, f); 158 *cp = '\0'; 159 return (0); 160 } 161 alarm(number(value(DIALTIMEOUT))); 162 read(FD, cp, 1); 163 alarm(0); 164 c = (*cp++ &= 0177); 165 #ifdef notdef 166 if (boolean(value(VERBOSE))) 167 putchar(c); 168 #endif 169 } while (c != '\n' && c != match); 170 signal(SIGALRM, SIG_DFL); 171 *cp = '\0'; 172 return (c == match); 173 } 174 175 #define min(a,b) ((a)>(b)?(b):(a)) 176 /* 177 * This convoluted piece of code attempts to get 178 * the ventel in sync. If you don't have FIONREAD 179 * there are gory ways to simulate this. 180 */ 181 static int 182 vensync(fd) 183 { 184 int already = 0, nread; 185 char buf[60]; 186 187 /* 188 * Toggle DTR to force anyone off that might have left 189 * the modem connected, and insure a consistent state 190 * to start from. 191 * 192 * If you don't have the ioctl calls to diddle directly 193 * with DTR, you can always try setting the baud rate to 0. 194 */ 195 ioctl(FD, TIOCCDTR, 0); 196 sleep(1); 197 ioctl(FD, TIOCSDTR, 0); 198 while (already < MAXRETRY) { 199 /* 200 * After reseting the modem, send it two \r's to 201 * autobaud on. Make sure to delay between them 202 * so the modem can frame the incoming characters. 203 */ 204 write(fd, "\r", 1); 205 delay(1,10); 206 write(fd, "\r", 1); 207 sleep(2); 208 if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) { 209 perror("tip: ioctl"); 210 continue; 211 } 212 while (nread > 0) { 213 read(fd, buf, min(nread, 60)); 214 if ((buf[nread - 1] & 0177) == '$') 215 return (1); 216 nread -= min(nread, 60); 217 } 218 sleep(1); 219 already++; 220 } 221 return (0); 222 } 223 224