1 #ifndef lint 2 static char sccsid[] = "@(#)ventel.c 1.5 (Berkeley) 06/25/83"; 3 #endif 4 5 /* 6 * Routines for calling up on a Ventel Modem 7 * The Ventel is expected to be strapped for "no echo". 8 */ 9 #include "tip.h" 10 11 #define MAXRETRY 5 12 13 static int sigALRM(); 14 static int timeout = 0; 15 static jmp_buf timeoutbuf; 16 17 ven_dialer(num, acu) 18 register char *num; 19 char *acu; 20 { 21 register char *cp; 22 register int connected = 0; 23 #ifdef ACULOG 24 char line[80]; 25 #endif 26 /* 27 * Get in synch with a couple of carriage returns 28 */ 29 if (!vensync(FD)) { 30 printf("can't synchronize with ventel\n"); 31 #ifdef ACULOG 32 logent(value(HOST), num, "ventel", "can't synch up"); 33 #endif 34 return (0); 35 } 36 if (boolean(value(VERBOSE))) 37 printf("\ndialing..."); 38 fflush(stdout); 39 ioctl(FD, TIOCHPCL, 0); 40 echo("#k$\r$\n$D$I$A$L$:$ "); 41 for (cp = num; *cp; cp++) { 42 sleep(1); 43 write(FD, cp, 1); 44 } 45 echo("\r$\n"); 46 if (gobble('\n')) 47 connected = gobble('!'); 48 ioctl(FD, TIOCFLUSH); 49 #ifdef ACULOG 50 if (timeout) { 51 sprintf(line, "%d second dial timeout", 52 number(value(DIALTIMEOUT))); 53 logent(value(HOST), num, "ventel", line); 54 } 55 #endif 56 if (timeout) 57 ven_disconnect(); /* insurance */ 58 return (connected); 59 } 60 61 ven_disconnect() 62 { 63 64 close(FD); 65 } 66 67 ven_abort() 68 { 69 70 write(FD, "\03", 1); 71 close(FD); 72 } 73 74 static int 75 echo(s) 76 register char *s; 77 { 78 char c; 79 80 while (c = *s++) switch (c) { 81 82 case '$': 83 read(FD, &c, 1); 84 s++; 85 break; 86 87 case '#': 88 c = *s++; 89 write(FD, &c, 1); 90 break; 91 92 default: 93 write(FD, &c, 1); 94 read(FD, &c, 1); 95 } 96 } 97 98 static int 99 sigALRM() 100 { 101 102 printf("\07timeout waiting for reply\n"); 103 timeout = 1; 104 longjmp(timeoutbuf, 1); 105 } 106 107 static int 108 gobble(match) 109 register char match; 110 { 111 char c; 112 int (*f)(); 113 114 signal(SIGALRM, sigALRM); 115 timeout = 0; 116 do { 117 if (setjmp(timeoutbuf)) { 118 signal(SIGALRM, f); 119 return (0); 120 } 121 alarm(number(value(DIALTIMEOUT))); 122 read(FD, &c, 1); 123 alarm(0); 124 c &= 0177; 125 #ifdef notdef 126 if (boolean(value(VERBOSE))) 127 putchar(c); 128 #endif 129 } while (c != '\n' && c != match); 130 signal(SIGALRM, SIG_DFL); 131 return (c == match); 132 } 133 134 #define min(a,b) ((a)>(b)?(b):(a)) 135 /* 136 * This convoluted piece of code attempts to get 137 * the ventel in sync. If you don't have FIONREAD 138 * there are gory ways to simulate this. 139 */ 140 static int 141 vensync(fd) 142 { 143 int already = 0, nread; 144 char buf[60]; 145 146 /* 147 * Toggle DTR to force anyone off that might have left 148 * the modem connected, and insure a consistent state 149 * to start from. 150 * 151 * If you don't have the ioctl calls to diddle directly 152 * with DTR, you can always try setting the baud rate to 0. 153 */ 154 ioctl(FD, TIOCCDTR, 0); 155 sleep(2); 156 ioctl(FD, TIOCSDTR, 0); 157 while (already < MAXRETRY) { 158 /* 159 * After reseting the modem, send it two \r's to 160 * autobaud on. Make sure to delay between them 161 * so the modem can frame the incoming characters. 162 */ 163 write(fd, "\r", 1); 164 sleep(1); 165 write(fd, "\r", 1); 166 sleep(3); 167 if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) { 168 perror("tip: ioctl"); 169 continue; 170 } 171 while (nread > 0) { 172 read(fd, buf, min(nread, 60)); 173 if ((buf[nread - 1] & 0177) == '$') 174 return (1); 175 nread -= min(nread, 60); 176 } 177 sleep(1); 178 already++; 179 } 180 return (0); 181 } 182