1 /* $NetBSD: ventel.c,v 1.14 2006/04/03 02:25:27 perry Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)ventel.c 8.1 (Berkeley) 6/6/93"; 36 #endif 37 __RCSID("$NetBSD: ventel.c,v 1.14 2006/04/03 02:25:27 perry Exp $"); 38 #endif /* not lint */ 39 40 /* 41 * Routines for calling up on a Ventel Modem 42 * The Ventel is expected to be strapped for local echo (just like uucp) 43 */ 44 #include "tip.h" 45 46 #define MAXRETRY 5 47 48 static int timeout = 0; 49 static jmp_buf timeoutbuf; 50 51 static void echo(const char *); 52 static int gobble(char, char *); 53 static void sigALRM(int); 54 static int vensync(int); 55 56 /* 57 * some sleep calls have been replaced by usleep(DELAYUS) 58 * because some ventel modems require two <cr>s in less than 59 * a second in order to 'wake up' 60 */ 61 #define DELAYUS 100000 /* delay in microseconds */ 62 63 int 64 ven_dialer(char *num, char *acu) 65 { 66 char *cp; 67 int connected = 0; 68 char *msg, line[80]; 69 struct termios cntrl; 70 71 /* 72 * Get in synch with a couple of carriage returns 73 */ 74 if (!vensync(FD)) { 75 printf("can't synchronize with ventel\n"); 76 return (0); 77 } 78 if (boolean(value(VERBOSE))) 79 printf("\ndialing..."); 80 fflush(stdout); 81 tcgetattr(FD, &cntrl); 82 cntrl.c_cflag |= HUPCL; 83 tcsetattr(FD, TCSANOW, &cntrl); 84 echo("#k$\r$\n$D$I$A$L$:$ "); 85 for (cp = num; *cp; cp++) { 86 usleep(DELAYUS); 87 write(FD, cp, 1); 88 } 89 usleep(DELAYUS); 90 write(FD, "\r", 1); 91 gobble('\n', line); 92 if (gobble('\n', line)) 93 connected = gobble('!', line); 94 tcflush(FD, TCIOFLUSH); 95 if (timeout) 96 ven_disconnect(); /* insurance */ 97 if (connected || timeout || !boolean(value(VERBOSE))) 98 return (connected); 99 /* call failed, parse response for user */ 100 cp = strchr(line, '\r'); 101 if (cp) 102 *cp = '\0'; 103 for (cp = line; (cp = strchr(cp, ' ')) != NULL; cp++) 104 if (cp[1] == ' ') 105 break; 106 if (cp) { 107 while (*cp == ' ') 108 cp++; 109 msg = cp; 110 while (*cp) { 111 if (isupper((unsigned char)*cp)) 112 *cp = tolower((unsigned char)*cp); 113 cp++; 114 } 115 printf("%s...", msg); 116 } 117 return (connected); 118 } 119 120 void 121 ven_disconnect(void) 122 { 123 124 close(FD); 125 } 126 127 void 128 ven_abort(void) 129 { 130 131 write(FD, "\03", 1); 132 close(FD); 133 } 134 135 static void 136 echo(const char *s) 137 { 138 char c; 139 140 while ((c = *s++) != 0) switch (c) { 141 142 case '$': 143 read(FD, &c, 1); 144 s++; 145 break; 146 147 case '#': 148 c = *s++; 149 write(FD, &c, 1); 150 break; 151 152 default: 153 write(FD, &c, 1); 154 read(FD, &c, 1); 155 } 156 } 157 158 static void 159 sigALRM(int dummy) 160 { 161 162 printf("\07timeout waiting for reply\n"); 163 timeout = 1; 164 longjmp(timeoutbuf, 1); 165 } 166 167 static int 168 gobble(char match, char response[]) 169 { 170 char *cp = response; 171 sig_t f; 172 char c; 173 174 #if __GNUC__ /* XXX pacify gcc */ 175 (void)&cp; 176 #endif 177 178 f = signal(SIGALRM, sigALRM); 179 timeout = 0; 180 do { 181 if (setjmp(timeoutbuf)) { 182 signal(SIGALRM, f); 183 *cp = '\0'; 184 return (0); 185 } 186 alarm(number(value(DIALTIMEOUT))); 187 read(FD, cp, 1); 188 alarm(0); 189 c = (*cp++ &= 0177); 190 #ifdef notdef 191 if (boolean(value(VERBOSE))) 192 putchar(c); 193 #endif 194 } while (c != '\n' && c != match); 195 signal(SIGALRM, SIG_DFL); 196 *cp = '\0'; 197 return (c == match); 198 } 199 200 #define min(a,b) ((a)>(b)?(b):(a)) 201 /* 202 * This convoluted piece of code attempts to get 203 * the ventel in sync. If you don't have FIONREAD 204 * there are gory ways to simulate this. 205 */ 206 static int 207 vensync(int fd) 208 { 209 int already = 0, nread; 210 char buf[60]; 211 212 /* 213 * Toggle DTR to force anyone off that might have left 214 * the modem connected, and insure a consistent state 215 * to start from. 216 * 217 * If you don't have the ioctl calls to diddle directly 218 * with DTR, you can always try setting the baud rate to 0. 219 */ 220 ioctl(FD, TIOCCDTR, 0); 221 sleep(1); 222 ioctl(FD, TIOCSDTR, 0); 223 while (already < MAXRETRY) { 224 /* 225 * After reseting the modem, send it two \r's to 226 * autobaud on. Make sure to delay between them 227 * so the modem can frame the incoming characters. 228 */ 229 write(fd, "\r", 1); 230 usleep(DELAYUS); 231 write(fd, "\r", 1); 232 sleep(2); 233 if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) { 234 perror("tip: ioctl"); 235 continue; 236 } 237 while (nread > 0) { 238 read(fd, buf, min(nread, sizeof buf)); 239 if ((buf[min(nread, sizeof buf) - 1] & 0177) == '$') 240 return (1); 241 nread -= min(nread, 60); 242 } 243 sleep(1); 244 already++; 245 } 246 return (0); 247 } 248