1 /* 2 * Copyright (c) 1983 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #ifndef lint 9 static char sccsid[] = "@(#)ventel.c 5.3 (Berkeley) 06/01/90"; 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static int sigALRM(); 21 static int timeout = 0; 22 static jmp_buf timeoutbuf; 23 24 /* 25 * some sleep calls have been replaced by this macro 26 * because some ventel modems require two 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); } 32 busyloop(n) { DELAY(n); } 33 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 42 /* 43 * Get in synch with a couple of carriage returns 44 */ 45 if (!vensync(FD)) { 46 printf("can't synchronize with ventel\n"); 47 #ifdef ACULOG 48 logent(value(HOST), num, "ventel", "can't synch up"); 49 #endif 50 return (0); 51 } 52 if (boolean(value(VERBOSE))) 53 printf("\ndialing..."); 54 fflush(stdout); 55 ioctl(FD, TIOCHPCL, 0); 56 echo("#k$\r$\n$D$I$A$L$:$ "); 57 for (cp = num; *cp; cp++) { 58 delay(1, 10); 59 write(FD, cp, 1); 60 } 61 delay(1, 10); 62 write(FD, "\r", 1); 63 gobble('\n', line); 64 if (gobble('\n', line)) 65 connected = gobble('!', line); 66 ioctl(FD, TIOCFLUSH); 67 #ifdef ACULOG 68 if (timeout) { 69 sprintf(line, "%d second dial timeout", 70 number(value(DIALTIMEOUT))); 71 logent(value(HOST), num, "ventel", line); 72 } 73 #endif 74 if (timeout) 75 ven_disconnect(); /* insurance */ 76 if (connected || timeout || !boolean(value(VERBOSE))) 77 return (connected); 78 /* call failed, parse response for user */ 79 cp = index(line, '\r'); 80 if (cp) 81 *cp = '\0'; 82 for (cp = line; cp = index(cp, ' '); cp++) 83 if (cp[1] == ' ') 84 break; 85 if (cp) { 86 while (*cp == ' ') 87 cp++; 88 msg = cp; 89 while (*cp) { 90 if (isupper(*cp)) 91 *cp = tolower(*cp); 92 cp++; 93 } 94 printf("%s...", msg); 95 } 96 return (connected); 97 } 98 99 ven_disconnect() 100 { 101 102 close(FD); 103 } 104 105 ven_abort() 106 { 107 108 write(FD, "\03", 1); 109 close(FD); 110 } 111 112 static int 113 echo(s) 114 register char *s; 115 { 116 char c; 117 118 while (c = *s++) switch (c) { 119 120 case '$': 121 read(FD, &c, 1); 122 s++; 123 break; 124 125 case '#': 126 c = *s++; 127 write(FD, &c, 1); 128 break; 129 130 default: 131 write(FD, &c, 1); 132 read(FD, &c, 1); 133 } 134 } 135 136 static int 137 sigALRM() 138 { 139 140 printf("\07timeout waiting for reply\n"); 141 timeout = 1; 142 longjmp(timeoutbuf, 1); 143 } 144 145 static int 146 gobble(match, response) 147 register char match; 148 char response[]; 149 { 150 register char *cp = response; 151 char c; 152 int (*f)(); 153 154 signal(SIGALRM, sigALRM); 155 timeout = 0; 156 do { 157 if (setjmp(timeoutbuf)) { 158 signal(SIGALRM, f); 159 *cp = '\0'; 160 return (0); 161 } 162 alarm(number(value(DIALTIMEOUT))); 163 read(FD, cp, 1); 164 alarm(0); 165 c = (*cp++ &= 0177); 166 #ifdef notdef 167 if (boolean(value(VERBOSE))) 168 putchar(c); 169 #endif 170 } while (c != '\n' && c != match); 171 signal(SIGALRM, SIG_DFL); 172 *cp = '\0'; 173 return (c == match); 174 } 175 176 #define min(a,b) ((a)>(b)?(b):(a)) 177 /* 178 * This convoluted piece of code attempts to get 179 * the ventel in sync. If you don't have FIONREAD 180 * there are gory ways to simulate this. 181 */ 182 static int 183 vensync(fd) 184 { 185 int already = 0, nread; 186 char buf[60]; 187 188 /* 189 * Toggle DTR to force anyone off that might have left 190 * the modem connected, and insure a consistent state 191 * to start from. 192 * 193 * If you don't have the ioctl calls to diddle directly 194 * with DTR, you can always try setting the baud rate to 0. 195 */ 196 ioctl(FD, TIOCCDTR, 0); 197 sleep(1); 198 ioctl(FD, TIOCSDTR, 0); 199 while (already < MAXRETRY) { 200 /* 201 * After reseting the modem, send it two \r's to 202 * autobaud on. Make sure to delay between them 203 * so the modem can frame the incoming characters. 204 */ 205 write(fd, "\r", 1); 206 delay(1,10); 207 write(fd, "\r", 1); 208 sleep(2); 209 if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) { 210 perror("tip: ioctl"); 211 continue; 212 } 213 while (nread > 0) { 214 read(fd, buf, min(nread, 60)); 215 if ((buf[nread - 1] & 0177) == '$') 216 return (1); 217 nread -= min(nread, 60); 218 } 219 sleep(1); 220 already++; 221 } 222 return (0); 223 } 224 225