| 1 | #include <stdio.h> |
| 2 | #include <signal.h> |
| 3 | #include <sgtty.h> |
| 4 | /* |
| 5 | * cu telno [-t] [-s speed] [-l line] [-a acu] |
| 6 | * |
| 7 | * -t is for dial-out to terminal. |
| 8 | * speeds are: 110, 134, 150, 300, 1200. 300 is default. |
| 9 | * |
| 10 | * Escape with `~' at beginning of line. |
| 11 | * Ordinary diversions are ~<, ~> and ~>>. |
| 12 | * Silent output diversions are ~>: and ~>>:. |
| 13 | * Terminate output diversion with ~> alone. |
| 14 | * Quit is ~. and ~! gives local command or shell. |
| 15 | * Also ~$ for canned procedure pumping remote. |
| 16 | * ~%put from [to] and ~%take from [to] invoke builtins |
| 17 | */ |
| 18 | |
| 19 | #define CRLF "\r\n" |
| 20 | #define wrc(ds) write(ds,&c,1) |
| 21 | |
| 22 | |
| 23 | char *devcul = "/dev/cul0"; |
| 24 | char *devcua = "/dev/cua0"; |
| 25 | char *lspeed = "300"; |
| 26 | |
| 27 | int ln; /* fd for comm line */ |
| 28 | char tkill, terase; /* current input kill & erase */ |
| 29 | char c; |
| 30 | |
| 31 | char *connmsg[] = { |
| 32 | "", |
| 33 | "line busy", |
| 34 | "call dropped", |
| 35 | "no carrier", |
| 36 | "can't fork", |
| 37 | "acu access", |
| 38 | "tty access", |
| 39 | "tty hung", |
| 40 | "usage: cu telno [-t] [-s speed] [-l line] [-a acu]" |
| 41 | }; |
| 42 | |
| 43 | rdc(ds) { |
| 44 | |
| 45 | ds=read(ds,&c,1); |
| 46 | c&= 0177; |
| 47 | return (ds); |
| 48 | } |
| 49 | |
| 50 | int intr; |
| 51 | |
| 52 | sig2() |
| 53 | { |
| 54 | signal(SIGINT, SIG_IGN); |
| 55 | intr = 1; |
| 56 | } |
| 57 | |
| 58 | int set14; |
| 59 | |
| 60 | xsleep(n) |
| 61 | { |
| 62 | xalarm(n); |
| 63 | pause(); |
| 64 | xalarm(0); |
| 65 | } |
| 66 | |
| 67 | xalarm(n) |
| 68 | { |
| 69 | set14=n; |
| 70 | alarm(n); |
| 71 | } |
| 72 | |
| 73 | sig14() |
| 74 | { |
| 75 | signal(SIGALRM, sig14); |
| 76 | if (set14) alarm(1); |
| 77 | } |
| 78 | |
| 79 | int dout; |
| 80 | int nhup; |
| 81 | |
| 82 | /* |
| 83 | * main: get connection, set speed for line. |
| 84 | * spawn child to invoke rd to read from line, output to fd 1 |
| 85 | * main line invokes wr to read tty, write to line |
| 86 | */ |
| 87 | main(ac,av) |
| 88 | char *av[]; |
| 89 | { |
| 90 | int fk; |
| 91 | int speed; |
| 92 | char *telno; |
| 93 | struct sgttyb stbuf; |
| 94 | |
| 95 | signal(SIGALRM, sig14); |
| 96 | if (ac < 2) { |
| 97 | prf(connmsg[8]); |
| 98 | exit(8); |
| 99 | } |
| 100 | telno = av[1]; |
| 101 | av += 2; |
| 102 | ac -= 2; |
| 103 | for (; ac > 0; av++) { |
| 104 | if (equal(*av, "-t")) { |
| 105 | dout = 1; |
| 106 | --ac; |
| 107 | continue; |
| 108 | } |
| 109 | if (ac < 2) |
| 110 | break; |
| 111 | if (equal(*av, "-s")) |
| 112 | lspeed = *++av; |
| 113 | else if (equal(*av, "-l")) |
| 114 | devcul = *++av; |
| 115 | else if (equal(*av, "-a")) |
| 116 | devcua = *++av; |
| 117 | else |
| 118 | break; |
| 119 | ac -= 2; |
| 120 | } |
| 121 | if (!exists(devcua) || !exists(devcul)) |
| 122 | exit(9); |
| 123 | ln = conn(devcul, devcua, telno); |
| 124 | if (ln < 0) { |
| 125 | prf("Connect failed: %s",connmsg[-ln]); |
| 126 | exit(-ln); |
| 127 | } |
| 128 | switch(atoi(lspeed)) { |
| 129 | case 110: |
| 130 | speed = B110;break; |
| 131 | case 150: |
| 132 | speed = B150;break; |
| 133 | default: |
| 134 | case 300: |
| 135 | speed = B300;break; |
| 136 | case 1200: |
| 137 | speed = B1200;break; |
| 138 | } |
| 139 | stbuf.sg_ispeed = speed; |
| 140 | stbuf.sg_ospeed = speed; |
| 141 | stbuf.sg_flags = EVENP|ODDP; |
| 142 | if (!dout) |
| 143 | stbuf.sg_flags |= RAW; |
| 144 | ioctl(TIOCSETP, ln, &stbuf); |
| 145 | ioctl(TIOCEXCL, ln, (struct sgttyb *)NULL); |
| 146 | ioctl(TIOCHPCL, ln, (struct sgttyb *)NULL); |
| 147 | prf("Connected"); |
| 148 | if (dout) |
| 149 | fk = -1; |
| 150 | else |
| 151 | fk = fork(); |
| 152 | nhup = (int)signal(SIGINT, SIG_IGN); |
| 153 | if (fk == 0) { |
| 154 | rd(); |
| 155 | prf("\007Lost carrier"); |
| 156 | exit(3); |
| 157 | } |
| 158 | mode(1); |
| 159 | wr(); |
| 160 | mode(0); |
| 161 | kill(fk, SIGKILL); |
| 162 | wait((int *)NULL); |
| 163 | stbuf.sg_ispeed = 0; |
| 164 | stbuf.sg_ospeed = 0; |
| 165 | ioctl(TIOCSETP, ln, &stbuf); |
| 166 | prf("Disconnected"); |
| 167 | exit(0); |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * conn: establish dial-out connection. |
| 172 | * Example: fd = conn("/dev/ttyh","/dev/dn1","4500"); |
| 173 | * Returns descriptor open to tty for reading and writing. |
| 174 | * Negative values (-1...-7) denote errors in connmsg. |
| 175 | * Uses alarm and fork/wait; requires sig14 handler. |
| 176 | * Be sure to disconnect tty when done, via HUPCL or stty 0. |
| 177 | */ |
| 178 | |
| 179 | conn(dev,acu,telno) |
| 180 | char *dev, *acu, *telno; |
| 181 | { |
| 182 | struct sgttyb stbuf; |
| 183 | extern errno; |
| 184 | char *p, *q, b[30]; |
| 185 | int er, fk, dn, dh, t; |
| 186 | er=0; |
| 187 | fk=(-1); |
| 188 | if ((dn=open(acu,1))<0) { |
| 189 | er=(errno == 6? 1:5); |
| 190 | goto X; |
| 191 | } |
| 192 | if ((fk=fork()) == (-1)) { |
| 193 | er=4; |
| 194 | goto X; |
| 195 | } |
| 196 | if (fk == 0) { |
| 197 | open(dev,2); |
| 198 | for (;;) pause(); |
| 199 | } |
| 200 | xsleep(2); |
| 201 | /* |
| 202 | * copy phone #, assure EON |
| 203 | */ |
| 204 | p=b; |
| 205 | q=telno; |
| 206 | while (*p++=(*q++)) |
| 207 | ; |
| 208 | p--; |
| 209 | if (*(p-1)!='<') { |
| 210 | if (*(p-1)!='-') *p++='-'; |
| 211 | *p++='<'; |
| 212 | } |
| 213 | t=p-b; |
| 214 | xalarm(5*t); |
| 215 | t=write(dn,b,t); |
| 216 | xalarm(0); |
| 217 | if (t<0) { |
| 218 | er=2; |
| 219 | goto X; |
| 220 | } |
| 221 | /* close(dn) */ |
| 222 | xalarm(40); /* was 5; sometimes missed carrier */ |
| 223 | dh = open(dev,2); |
| 224 | xalarm(0); |
| 225 | if (dh<0) { |
| 226 | er=(errno == 4? 3:6); |
| 227 | goto X; |
| 228 | } |
| 229 | ioctl(TIOCGETP, ln, &stbuf); |
| 230 | stbuf.sg_flags &= ~ECHO; |
| 231 | xalarm(10); |
| 232 | ioctl(TIOCSETP, dh, &stbuf); |
| 233 | ioctl(TIOCHPCL, dh, (struct sgttyb *)NULL); |
| 234 | xalarm(0); |
| 235 | X: |
| 236 | if (er) close(dn); |
| 237 | if (fk!=(-1)) { |
| 238 | kill(fk, SIGKILL); |
| 239 | xalarm(10); |
| 240 | while ((t=wait((int *)NULL))!=(-1) && t!=fk); |
| 241 | xalarm(0); |
| 242 | } |
| 243 | return (er? -er:dh); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * wr: write to remote: 0 -> line. |
| 248 | * ~. terminate |
| 249 | * ~<file send file |
| 250 | * ~! local login-style shell |
| 251 | * ~!cmd execute cmd locally |
| 252 | * ~$proc execute proc locally, send output to line |
| 253 | * ~%cmd execute builtin cmd (put and take) |
| 254 | */ |
| 255 | |
| 256 | wr() |
| 257 | { |
| 258 | int ds,fk,lcl,x; |
| 259 | char *p,b[600]; |
| 260 | for (;;) { |
| 261 | p=b; |
| 262 | while (rdc(0) == 1) { |
| 263 | if (p == b) lcl=(c == '~'); |
| 264 | if (p == b+1 && b[0] == '~') lcl=(c!='~'); |
| 265 | if (c == 0) c=0177; |
| 266 | if (!lcl) { |
| 267 | if (wrc(ln) == 0) { |
| 268 | prf("line gone"); return; |
| 269 | } |
| 270 | } |
| 271 | if (lcl) { |
| 272 | if (c == 0177) c=tkill; |
| 273 | if (c == '\r' || c == '\n') goto A; |
| 274 | if (!dout) wrc(0); |
| 275 | } |
| 276 | *p++=c; |
| 277 | if (c == terase) { |
| 278 | p=p-2; |
| 279 | if (p<b) p=b; |
| 280 | } |
| 281 | if (c == tkill || c == 0177 || c == '\r' || c == '\n') p=b; |
| 282 | } |
| 283 | return; |
| 284 | A: |
| 285 | if (!dout) echo(""); |
| 286 | *p=0; |
| 287 | switch (b[1]) { |
| 288 | case '.': |
| 289 | case '\004': |
| 290 | return; |
| 291 | case '!': |
| 292 | case '$': |
| 293 | fk = fork(); |
| 294 | if (fk == 0) { |
| 295 | close(1); |
| 296 | dup(b[1] == '$'? ln:2); |
| 297 | close(ln); |
| 298 | mode(0); |
| 299 | if (!nhup) signal(SIGINT, SIG_DFL); |
| 300 | if (b[2] == 0) execl("/bin/sh","-",0); |
| 301 | else execl("/bin/sh","sh","-c",b+2,0); |
| 302 | prf("Can't execute shell"); |
| 303 | exit(~0); |
| 304 | } |
| 305 | if (fk!=(-1)) { |
| 306 | while (wait(&x)!=fk); |
| 307 | } |
| 308 | mode(1); |
| 309 | if (b[1] == '!') echo("!"); |
| 310 | else { |
| 311 | if (dout) echo("$"); |
| 312 | } |
| 313 | break; |
| 314 | case '<': |
| 315 | if (b[2] == 0) break; |
| 316 | if ((ds=open(b+2,0))<0) { |
| 317 | prf("Can't divert %s",b+1); |
| 318 | break; |
| 319 | } |
| 320 | intr=x=0; |
| 321 | mode(2); |
| 322 | if (!nhup) signal(SIGINT, sig2); |
| 323 | while (!intr && rdc(ds) == 1) { |
| 324 | if (wrc(ln) == 0) { |
| 325 | x=1; |
| 326 | break; |
| 327 | } |
| 328 | } |
| 329 | signal(SIGINT, SIG_IGN); |
| 330 | close(ds); |
| 331 | mode(1); |
| 332 | if (x) return; |
| 333 | if (dout) echo("<"); |
| 334 | break; |
| 335 | case '%': |
| 336 | dopercen(&b[2]); |
| 337 | break; |
| 338 | default: |
| 339 | prf("Use `~~' to start line with `~'"); |
| 340 | } |
| 341 | continue; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | dopercen(line) |
| 346 | register char *line; |
| 347 | { |
| 348 | char *args[10]; |
| 349 | register narg, f; |
| 350 | int rcount; |
| 351 | for (narg = 0; narg < 10;) { |
| 352 | while(*line == ' ' || *line == '\t') |
| 353 | line++; |
| 354 | if (*line == '\0') |
| 355 | break; |
| 356 | args[narg++] = line; |
| 357 | while(*line != '\0' && *line != ' ' && *line != '\t') |
| 358 | line++; |
| 359 | if (*line == '\0') |
| 360 | break; |
| 361 | *line++ = '\0'; |
| 362 | } |
| 363 | if (equal(args[0], "take")) { |
| 364 | if (narg < 2) { |
| 365 | prf("usage: ~%%take from [to]"); |
| 366 | return; |
| 367 | } |
| 368 | if (narg < 3) |
| 369 | args[2] = args[1]; |
| 370 | wrln("echo '~>:'"); |
| 371 | wrln(args[2]); |
| 372 | wrln(";tee /dev/null <"); |
| 373 | wrln(args[1]); |
| 374 | wrln(";echo '~>'\n"); |
| 375 | return; |
| 376 | } else if (equal(args[0], "put")) { |
| 377 | if (narg < 2) { |
| 378 | prf("usage: ~%%put from [to]"); |
| 379 | return; |
| 380 | } |
| 381 | if (narg < 3) |
| 382 | args[2] = args[1]; |
| 383 | if ((f = open(args[1], 0)) < 0) { |
| 384 | prf("cannot open: %s", args[1]); |
| 385 | return; |
| 386 | } |
| 387 | wrln("stty -echo;cat >"); |
| 388 | wrln(args[2]); |
| 389 | wrln(";stty echo\n"); |
| 390 | xsleep(5); |
| 391 | intr = 0; |
| 392 | if (!nhup) |
| 393 | signal(SIGINT, sig2); |
| 394 | mode(2); |
| 395 | rcount = 0; |
| 396 | while(!intr && rdc(f) == 1) { |
| 397 | rcount++; |
| 398 | if (c == tkill || c == terase) |
| 399 | wrln("\\"); |
| 400 | if (wrc(ln) != 1) { |
| 401 | xsleep(2); |
| 402 | if (wrc(ln) != 1) { |
| 403 | prf("character missed"); |
| 404 | intr = 1; |
| 405 | break; |
| 406 | } |
| 407 | } |
| 408 | } |
| 409 | signal(SIGINT, SIG_IGN); |
| 410 | close(f); |
| 411 | if (intr) { |
| 412 | wrln("\n"); |
| 413 | prf("stopped after %d bytes", rcount); |
| 414 | } |
| 415 | wrln("\004"); |
| 416 | xsleep(5); |
| 417 | mode(1); |
| 418 | return; |
| 419 | } |
| 420 | prf("~%%%s unknown\n", args[0]); |
| 421 | } |
| 422 | |
| 423 | equal(s1, s2) |
| 424 | register char *s1, *s2; |
| 425 | { |
| 426 | while (*s1++ == *s2) |
| 427 | if (*s2++ == '\0') |
| 428 | return(1); |
| 429 | return(0); |
| 430 | } |
| 431 | |
| 432 | wrln(s) |
| 433 | register char *s; |
| 434 | { |
| 435 | while (*s) |
| 436 | write(ln, s++, 1); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * rd: read from remote: line -> 1 |
| 441 | * catch: |
| 442 | * ~>[>][:][file] |
| 443 | * stuff from file... |
| 444 | * ~> (ends diversion) |
| 445 | */ |
| 446 | |
| 447 | rd() |
| 448 | { |
| 449 | int ds,slnt; |
| 450 | char *p,*q,b[600]; |
| 451 | p=b; |
| 452 | ds=(-1); |
| 453 | while (rdc(ln) == 1) { |
| 454 | if (ds<0) slnt=0; |
| 455 | if (!slnt) wrc(1); |
| 456 | *p++=c; |
| 457 | if (c!='\n') continue; |
| 458 | q=p; |
| 459 | p=b; |
| 460 | if (b[0]!='~' || b[1]!='>') { |
| 461 | if (*(q-2) == '\r') { |
| 462 | q--; |
| 463 | *(q-1)=(*q); |
| 464 | } |
| 465 | if (ds>=0) write(ds,b,q-b); |
| 466 | continue; |
| 467 | } |
| 468 | if (ds>=0) close(ds); |
| 469 | if (slnt) { |
| 470 | write(1, b, q - b); |
| 471 | write(1, CRLF, sizeof(CRLF)); |
| 472 | } |
| 473 | if (*(q-2) == '\r') q--; |
| 474 | *(q-1)=0; |
| 475 | slnt=0; |
| 476 | q=b+2; |
| 477 | if (*q == '>') q++; |
| 478 | if (*q == ':') { |
| 479 | slnt=1; |
| 480 | q++; |
| 481 | } |
| 482 | if (*q == 0) { |
| 483 | ds=(-1); |
| 484 | continue; |
| 485 | } |
| 486 | if (b[2]!='>' || (ds=open(q,1))<0) ds=creat(q,0644); |
| 487 | lseek(ds, (long)0, 2); |
| 488 | if (ds<0) prf("Can't divert %s",b+1); |
| 489 | } |
| 490 | } |
| 491 | |
| 492 | struct {char lobyte; char hibyte;}; |
| 493 | mode(f) |
| 494 | { |
| 495 | struct sgttyb stbuf; |
| 496 | if (dout) return; |
| 497 | ioctl(TIOCGETP, 0, &stbuf); |
| 498 | tkill = stbuf.sg_kill; |
| 499 | terase = stbuf.sg_erase; |
| 500 | if (f == 0) { |
| 501 | stbuf.sg_flags &= ~RAW; |
| 502 | stbuf.sg_flags |= ECHO|CRMOD; |
| 503 | } |
| 504 | if (f == 1) { |
| 505 | stbuf.sg_flags |= RAW; |
| 506 | stbuf.sg_flags &= ECHO|CRMOD; |
| 507 | } |
| 508 | if (f == 2) { |
| 509 | stbuf.sg_flags &= ~RAW; |
| 510 | stbuf.sg_flags &= ~(ECHO|CRMOD); |
| 511 | } |
| 512 | ioctl(TIOCSETP, 0, &stbuf); |
| 513 | } |
| 514 | |
| 515 | echo(s) |
| 516 | char *s; |
| 517 | { |
| 518 | char *p; |
| 519 | for (p=s;*p;p++); |
| 520 | if (p>s) write(0,s,p-s); |
| 521 | write(0,CRLF, sizeof(CRLF)); |
| 522 | } |
| 523 | |
| 524 | prf(f, s) |
| 525 | char *f; |
| 526 | char *s; |
| 527 | { |
| 528 | fprintf(stderr, f, s); |
| 529 | fprintf(stderr, CRLF); |
| 530 | } |
| 531 | |
| 532 | exists(devname) |
| 533 | char *devname; |
| 534 | { |
| 535 | if (access(devname, 0)==0) |
| 536 | return(1); |
| 537 | prf("%s does not exist", devname); |
| 538 | return(0); |
| 539 | } |