Commit | Line | Data |
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e657cc9e BJ |
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 | int efk; /* process of id of listener */ | |
30 | char c; | |
31 | ||
32 | char *connmsg[] = { | |
33 | "", | |
34 | "line busy", | |
35 | "call dropped", | |
36 | "no carrier", | |
37 | "can't fork", | |
38 | "acu access", | |
39 | "tty access", | |
40 | "tty hung", | |
41 | "usage: cu telno [-t] [-s speed] [-l line] [-a acu]" | |
42 | }; | |
43 | ||
44 | rdc(ds) { | |
45 | ||
46 | ds=read(ds,&c,1); | |
47 | c&= 0177; | |
48 | return (ds); | |
49 | } | |
50 | ||
51 | int intr; | |
52 | ||
53 | sig2() | |
54 | { | |
55 | signal(SIGINT, SIG_IGN); | |
56 | intr = 1; | |
57 | } | |
58 | ||
59 | int set14; | |
60 | ||
61 | xsleep(n) | |
62 | { | |
63 | xalarm(n); | |
64 | pause(); | |
65 | xalarm(0); | |
66 | } | |
67 | ||
68 | xalarm(n) | |
69 | { | |
70 | set14=n; | |
71 | alarm(n); | |
72 | } | |
73 | ||
74 | sig14() | |
75 | { | |
76 | signal(SIGALRM, sig14); | |
77 | if (set14) alarm(1); | |
78 | } | |
79 | ||
80 | int dout; | |
81 | int nhup; | |
82 | int dbflag; | |
83 | ||
84 | /* | |
85 | * main: get connection, set speed for line. | |
86 | * spawn child to invoke rd to read from line, output to fd 1 | |
87 | * main line invokes wr to read tty, write to line | |
88 | */ | |
89 | main(ac,av) | |
90 | char *av[]; | |
91 | { | |
92 | int fk; | |
93 | int speed; | |
94 | char *telno; | |
95 | struct sgttyb stbuf; | |
96 | ||
97 | signal(SIGALRM, sig14); | |
98 | if (ac < 2) { | |
99 | prf(connmsg[8]); | |
100 | exit(8); | |
101 | } | |
102 | telno = av[1]; | |
103 | av += 2; | |
104 | ac -= 2; | |
105 | for (; ac > 0; av++) { | |
106 | if (equal(*av, "-t")) { | |
107 | dout = 1; | |
108 | --ac; | |
109 | continue; | |
110 | } | |
111 | if (equal(*av, "-d")) { | |
112 | dbflag++; | |
113 | continue; | |
114 | } | |
115 | if (ac < 2) | |
116 | break; | |
117 | if (equal(*av, "-s")) | |
118 | lspeed = *++av; | |
119 | else if (equal(*av, "-l")) | |
120 | devcul = *++av; | |
121 | else if (equal(*av, "-a")) | |
122 | devcua = *++av; | |
123 | else | |
124 | break; | |
125 | ac -= 2; | |
126 | } | |
127 | if (!exists(devcua) || !exists(devcul)) | |
128 | exit(9); | |
129 | ln = conn(devcul, devcua, telno); | |
130 | if (ln < 0) { | |
131 | prf("Connect failed: %s",connmsg[-ln]); | |
132 | exit(-ln); | |
133 | } | |
134 | switch(atoi(lspeed)) { | |
135 | case 110: | |
136 | speed = B110;break; | |
137 | case 150: | |
138 | speed = B150;break; | |
139 | default: | |
140 | case 300: | |
141 | speed = B300;break; | |
142 | case 1200: | |
143 | speed = B1200;break; | |
144 | } | |
145 | stbuf.sg_ispeed = speed; | |
146 | stbuf.sg_ospeed = speed; | |
147 | stbuf.sg_flags = EVENP|ODDP; | |
148 | if (!dout) | |
149 | stbuf.sg_flags |= RAW; | |
150 | ioctl(TIOCSETP, ln, &stbuf); | |
151 | ioctl(TIOCEXCL, ln, (struct sgttyb *)NULL); | |
152 | ioctl(TIOCHPCL, ln, (struct sgttyb *)NULL); | |
153 | prf("Connected"); | |
154 | if (dout) | |
155 | fk = -1; | |
156 | else | |
157 | fk = fork(); | |
158 | nhup = (int)signal(SIGINT, SIG_IGN); | |
159 | if (fk == 0) { | |
160 | chwrsig(); | |
161 | rd(); | |
162 | prf("\007Lost carrier"); | |
163 | exit(3); | |
164 | } | |
165 | mode(1); | |
166 | efk = fk; | |
167 | wr(); | |
168 | mode(0); | |
169 | kill(fk, SIGKILL); | |
170 | wait((int *)NULL); | |
171 | stbuf.sg_ispeed = 0; | |
172 | stbuf.sg_ospeed = 0; | |
173 | ioctl(TIOCSETP, ln, &stbuf); | |
174 | prf("Disconnected"); | |
175 | exit(0); | |
176 | } | |
177 | ||
178 | /* | |
179 | * conn: establish dial-out connection. | |
180 | * Example: fd = conn("/dev/ttyh","/dev/dn1","4500"); | |
181 | * Returns descriptor open to tty for reading and writing. | |
182 | * Negative values (-1...-7) denote errors in connmsg. | |
183 | * Uses alarm and fork/wait; requires sig14 handler. | |
184 | * Be sure to disconnect tty when done, via HUPCL or stty 0. | |
185 | */ | |
186 | ||
187 | conn(dev,acu,telno) | |
188 | char *dev, *acu, *telno; | |
189 | { | |
190 | struct sgttyb stbuf; | |
191 | extern errno; | |
192 | char *p, *q, b[30]; | |
193 | int er, fk, dn, dh, t; | |
194 | er=0; | |
195 | fk=(-1); | |
196 | if ((dn=open(acu,1))<0) { | |
197 | er=(errno == 6? 1:5); | |
198 | goto X; | |
199 | } | |
200 | if ((fk=fork()) == (-1)) { | |
201 | er=4; | |
202 | goto X; | |
203 | } | |
204 | if (fk == 0) { | |
205 | open(dev,2); | |
206 | for (;;) pause(); | |
207 | } | |
208 | xsleep(2); | |
209 | /* | |
210 | * copy phone #, assure EON | |
211 | */ | |
212 | p=b; | |
213 | q=telno; | |
214 | while (*p++=(*q++)) | |
215 | ; | |
216 | p--; | |
217 | if (*(p-1)!='<') { | |
218 | if (*(p-1)!='-') *p++='-'; | |
219 | *p++='<'; | |
220 | } | |
221 | t=p-b; | |
222 | xalarm(5*t); | |
223 | t=write(dn,b,t); | |
224 | xalarm(0); | |
225 | if (t<0) { | |
226 | er=2; | |
227 | goto X; | |
228 | } | |
229 | /* close(dn) */ | |
230 | xalarm(40); /* was 5; sometimes missed carrier */ | |
231 | dh = open(dev,2); | |
232 | xalarm(0); | |
233 | if (dh<0) { | |
234 | er=(errno == 4? 3:6); | |
235 | goto X; | |
236 | } | |
237 | ioctl(TIOCGETP, ln, &stbuf); | |
238 | stbuf.sg_flags &= ~ECHO; | |
239 | xalarm(10); | |
240 | ioctl(TIOCSETP, dh, &stbuf); | |
241 | ioctl(TIOCHPCL, dh, (struct sgttyb *)NULL); | |
242 | xalarm(0); | |
243 | X: | |
244 | if (er) close(dn); | |
245 | if (fk!=(-1)) { | |
246 | kill(fk, SIGKILL); | |
247 | xalarm(10); | |
248 | while ((t=wait((int *)NULL))!=(-1) && t!=fk); | |
249 | xalarm(0); | |
250 | } | |
251 | return (er? -er:dh); | |
252 | } | |
253 | ||
254 | /* | |
255 | * wr: write to remote: 0 -> line. | |
256 | * ~. terminate | |
257 | * ~<file send file | |
258 | * ~! local login-style shell | |
259 | * ~!cmd execute cmd locally | |
260 | * ~$proc execute proc locally, send output to line | |
261 | * ~%cmd execute builtin cmd (put and take) | |
262 | */ | |
263 | ||
264 | wr() | |
265 | { | |
266 | int ds,fk,lcl,x; | |
267 | char *p,b[600]; | |
268 | for (;;) { | |
269 | p=b; | |
270 | while (rdc(0) == 1) { | |
271 | if (p == b) lcl=(c == '~'); | |
272 | if (p == b+1 && b[0] == '~') lcl=(c!='~'); | |
273 | if (c == 0) c=0177; | |
274 | if (!lcl) { | |
275 | if (wrc(ln) == 0) { | |
276 | prf("line gone"); return; | |
277 | } | |
278 | } | |
279 | if (lcl) { | |
280 | if (c == 0177) c=tkill; | |
281 | if (c == '\r' || c == '\n') goto A; | |
282 | if (!dout) wrc(0); | |
283 | } | |
284 | *p++=c; | |
285 | if (c == terase) { | |
286 | p=p-2; | |
287 | if (p<b) p=b; | |
288 | } | |
289 | if (c == tkill || c == 0177 || c == '\r' || c == '\n') p=b; | |
290 | } | |
291 | return; | |
292 | A: | |
293 | if (!dout) echo(""); | |
294 | *p=0; | |
295 | switch (b[1]) { | |
296 | case '.': | |
297 | case '\004': | |
298 | return; | |
299 | case '!': | |
300 | case '$': | |
301 | fk = fork(); | |
302 | if (fk == 0) { | |
303 | char *shell = getenv("SHELL"); | |
304 | if (shell == 0) shell = "/bin/sh"; | |
305 | close(1); | |
306 | dup(b[1] == '$'? ln:2); | |
307 | close(ln); | |
308 | mode(0); | |
309 | if (!nhup) signal(SIGINT, SIG_DFL); | |
310 | if (b[2] == 0) execl(shell,"-",0); | |
311 | else execl(shell,"sh","-c",b+2,0); | |
312 | prf("Can't execute shell"); | |
313 | exit(~0); | |
314 | } | |
315 | if (fk!=(-1)) { | |
316 | while (wait(&x)!=fk); | |
317 | } | |
318 | mode(1); | |
319 | if (b[1] == '!') echo("!"); | |
320 | else { | |
321 | if (dout) echo("$"); | |
322 | } | |
323 | break; | |
324 | case '<': | |
325 | if (b[2] == 0) break; | |
326 | if ((ds=open(b+2,0))<0) { | |
327 | prf("Can't divert %s",b+1); | |
328 | break; | |
329 | } | |
330 | intr=x=0; | |
331 | mode(2); | |
332 | if (!nhup) signal(SIGINT, sig2); | |
333 | while (!intr && rdc(ds) == 1) { | |
334 | if (wrc(ln) == 0) { | |
335 | x=1; | |
336 | break; | |
337 | } | |
338 | } | |
339 | signal(SIGINT, SIG_IGN); | |
340 | close(ds); | |
341 | mode(1); | |
342 | if (x) return; | |
343 | if (dout) echo("<"); | |
344 | break; | |
345 | case '>': | |
346 | case ':': | |
347 | { | |
348 | FILE *fp; char tbuff[128]; register char *q; | |
349 | sprintf(tbuff,"/tmp/cu%d",efk); | |
350 | if(NULL==(fp = fopen(tbuff,"w"))) { | |
351 | prf("Can't tell other demon to divert"); | |
352 | break; | |
353 | } | |
354 | fprintf(fp,"%s\n",(b[1]=='>'?&b[2]: &b[1] )); | |
355 | if(dbflag) prf("name to be written in temporary:"),prf(&b[2]); | |
356 | fclose(fp); | |
357 | kill(efk,SIGEMT); | |
358 | } | |
359 | break; | |
360 | case '%': | |
361 | dopercen(&b[2]); | |
362 | break; | |
363 | default: | |
364 | prf("Use `~~' to start line with `~'"); | |
365 | } | |
366 | continue; | |
367 | } | |
368 | } | |
369 | ||
370 | dopercen(line) | |
371 | register char *line; | |
372 | { | |
373 | char *args[10]; | |
374 | register narg, f; | |
375 | int rcount; | |
376 | for (narg = 0; narg < 10;) { | |
377 | while(*line == ' ' || *line == '\t') | |
378 | line++; | |
379 | if (*line == '\0') | |
380 | break; | |
381 | args[narg++] = line; | |
382 | while(*line != '\0' && *line != ' ' && *line != '\t') | |
383 | line++; | |
384 | if (*line == '\0') | |
385 | break; | |
386 | *line++ = '\0'; | |
387 | } | |
388 | if (equal(args[0], "take")) { | |
389 | if (narg < 2) { | |
390 | prf("usage: ~%%take from [to]"); | |
391 | return; | |
392 | } | |
393 | if (narg < 3) | |
394 | args[2] = args[1]; | |
395 | wrln("echo '~>:'"); | |
396 | wrln(args[2]); | |
397 | wrln(";tee /dev/null <"); | |
398 | wrln(args[1]); | |
399 | wrln(";echo '~>'\n"); | |
400 | return; | |
401 | } else if (equal(args[0], "put")) { | |
402 | if (narg < 2) { | |
403 | prf("usage: ~%%put from [to]"); | |
404 | return; | |
405 | } | |
406 | if (narg < 3) | |
407 | args[2] = args[1]; | |
408 | if ((f = open(args[1], 0)) < 0) { | |
409 | prf("cannot open: %s", args[1]); | |
410 | return; | |
411 | } | |
412 | wrln("stty -echo;cat >"); | |
413 | wrln(args[2]); | |
414 | wrln(";stty echo\n"); | |
415 | xsleep(5); | |
416 | intr = 0; | |
417 | if (!nhup) | |
418 | signal(SIGINT, sig2); | |
419 | mode(2); | |
420 | rcount = 0; | |
421 | while(!intr && rdc(f) == 1) { | |
422 | rcount++; | |
423 | if (c == tkill || c == terase) | |
424 | wrln("\\"); | |
425 | if (wrc(ln) != 1) { | |
426 | xsleep(2); | |
427 | if (wrc(ln) != 1) { | |
428 | prf("character missed"); | |
429 | intr = 1; | |
430 | break; | |
431 | } | |
432 | } | |
433 | } | |
434 | signal(SIGINT, SIG_IGN); | |
435 | close(f); | |
436 | if (intr) { | |
437 | wrln("\n"); | |
438 | prf("stopped after %d bytes", rcount); | |
439 | } | |
440 | wrln("\004"); | |
441 | xsleep(5); | |
442 | mode(1); | |
443 | return; | |
444 | } | |
445 | prf("~%%%s unknown\n", args[0]); | |
446 | } | |
447 | ||
448 | equal(s1, s2) | |
449 | register char *s1, *s2; | |
450 | { | |
451 | while (*s1++ == *s2) | |
452 | if (*s2++ == '\0') | |
453 | return(1); | |
454 | return(0); | |
455 | } | |
456 | ||
457 | wrln(s) | |
458 | register char *s; | |
459 | { | |
460 | while (*s) | |
461 | write(ln, s++, 1); | |
462 | } | |
463 | /* chwrsig: Catch orders from wr process | |
464 | * to instigate diversion | |
465 | */ | |
466 | int whoami; | |
467 | chwrsig(){ | |
468 | int dodiver(); | |
469 | whoami = getpid(); | |
470 | signal(SIGEMT,dodiver); | |
471 | } | |
472 | int ds,slnt; | |
473 | int justrung; | |
474 | dodiver(){ | |
475 | static char dobuff[128], morejunk[256]; register char *cp; | |
476 | FILE *fp; | |
477 | justrung = 1; | |
478 | signal(SIGEMT,dodiver); | |
479 | sprintf(dobuff,"/tmp/cu%d",whoami); | |
480 | fp = fopen(dobuff,"r"); | |
481 | if(fp==NULL) prf("Couldn't open temporary"); | |
482 | unlink(dobuff); | |
483 | if(dbflag) { | |
484 | prf("Name of temporary:"); | |
485 | prf(dobuff); | |
486 | } | |
487 | fgets(dobuff,128,fp); fclose(fp); | |
488 | if(dbflag) { | |
489 | prf("Name of target file:"); | |
490 | prf(dobuff); | |
491 | } | |
492 | for(cp = dobuff-1; *++cp; ) /* squash newline */ | |
493 | if(*cp=='\n') *cp=0; | |
494 | cp = dobuff; | |
495 | if (*cp=='>') cp++; | |
496 | if (*cp==':') { | |
497 | cp++; | |
498 | if(*cp==0) { | |
499 | slnt ^= 1; | |
500 | return; | |
501 | } else { | |
502 | slnt = 1; | |
503 | } | |
504 | } | |
505 | if (ds >= 0) close(ds); | |
506 | if (*cp==0) { | |
507 | slnt = 0; | |
508 | ds = -1; | |
509 | return; | |
510 | } | |
511 | if (*dobuff!='>' || (ds=open(cp,1))<0) ds=creat(cp,0644); | |
512 | lseek(ds, (long)0, 2); | |
513 | if(ds < 0) prf("Creat failed:"), prf(cp); | |
514 | if (ds<0) prf("Can't divert %s",cp+1); | |
515 | } | |
516 | ||
517 | ||
518 | /* | |
519 | * rd: read from remote: line -> 1 | |
520 | * catch: | |
521 | * ~>[>][:][file] | |
522 | * stuff from file... | |
523 | * ~> (ends diversion) | |
524 | */ | |
525 | ||
526 | rd() | |
527 | { | |
528 | extern int ds,slnt; | |
529 | char *p,*q,b[600]; | |
530 | p=b; | |
531 | ds=(-1); | |
532 | agin: | |
533 | while (rdc(ln) == 1) { | |
534 | if (!slnt) wrc(1); | |
535 | *p++=c; | |
536 | if (c!='\n') continue; | |
537 | q=p; | |
538 | p=b; | |
539 | if (b[0]!='~' || b[1]!='>') { | |
540 | if (*(q-2) == '\r') { | |
541 | q--; | |
542 | *(q-1)=(*q); | |
543 | } | |
544 | if (ds>=0) write(ds,b,q-b); | |
545 | continue; | |
546 | } | |
547 | if (ds>=0) close(ds); | |
548 | if (slnt) { | |
549 | write(1, b, q - b); | |
550 | write(1, CRLF, sizeof(CRLF)); | |
551 | } | |
552 | if (*(q-2) == '\r') q--; | |
553 | *(q-1)=0; | |
554 | slnt=0; | |
555 | q=b+2; | |
556 | if (*q == '>') q++; | |
557 | if (*q == ':') { | |
558 | slnt=1; | |
559 | q++; | |
560 | } | |
561 | if (*q == 0) { | |
562 | ds=(-1); | |
563 | continue; | |
564 | } | |
565 | if (b[2]!='>' || (ds=open(q,1))<0) ds=creat(q,0644); | |
566 | lseek(ds, (long)0, 2); | |
567 | if (ds<0) prf("Can't divert %s",b+1); | |
568 | } | |
569 | if(justrung) { | |
570 | justrung = 0; | |
571 | goto agin; | |
572 | } | |
573 | } | |
574 | ||
575 | struct {char lobyte; char hibyte;}; | |
576 | mode(f) | |
577 | { | |
578 | struct sgttyb stbuf; | |
579 | if (dout) return; | |
580 | ioctl(TIOCGETP, 0, &stbuf); | |
581 | tkill = stbuf.sg_kill; | |
582 | terase = stbuf.sg_erase; | |
583 | if (f == 0) { | |
584 | stbuf.sg_flags &= ~RAW; | |
585 | stbuf.sg_flags |= ECHO|CRMOD; | |
586 | } | |
587 | if (f == 1) { | |
588 | stbuf.sg_flags |= RAW; | |
589 | stbuf.sg_flags &= ECHO|CRMOD; | |
590 | } | |
591 | if (f == 2) { | |
592 | stbuf.sg_flags &= ~RAW; | |
593 | stbuf.sg_flags &= ~(ECHO|CRMOD); | |
594 | } | |
595 | ioctl(TIOCSETP, 0, &stbuf); | |
596 | } | |
597 | ||
598 | echo(s) | |
599 | char *s; | |
600 | { | |
601 | char *p; | |
602 | for (p=s;*p;p++); | |
603 | if (p>s) write(0,s,p-s); | |
604 | write(0,CRLF, sizeof(CRLF)); | |
605 | } | |
606 | ||
607 | prf(f, s) | |
608 | char *f; | |
609 | char *s; | |
610 | { | |
611 | fprintf(stderr, f, s); | |
612 | fprintf(stderr, CRLF); | |
613 | } | |
614 | ||
615 | exists(devname) | |
616 | char *devname; | |
617 | { | |
618 | if (access(devname, 0)==0) | |
619 | return(1); | |
620 | prf("%s does not exist", devname); | |
621 | return(0); | |
622 | } |