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31cef89c | 1 | static char *sccsid = "@(#)cu.c 4.1 (Berkeley) 10/1/80"; |
fb5d50d1 BJ |
2 | #include <stdio.h> |
3 | #include <signal.h> | |
4 | #include <sgtty.h> | |
5 | /* | |
6 | * cu telno [-t] [-s speed] [-l line] [-a acu] | |
7 | * | |
8 | * -t is for dial-out to terminal. | |
9 | * speeds are: 110, 134, 150, 300, 1200. 300 is default. | |
10 | * | |
11 | * Escape with `~' at beginning of line. | |
12 | * Ordinary diversions are ~<, ~> and ~>>. | |
13 | * Silent output diversions are ~>: and ~>>:. | |
14 | * Terminate output diversion with ~> alone. | |
15 | * Quit is ~. and ~! gives local command or shell. | |
16 | * Also ~$ for canned procedure pumping remote. | |
17 | * ~%put from [to] and ~%take from [to] invoke builtins | |
18 | */ | |
19 | ||
20 | #define CRLF "\r\n" | |
21 | #define wrc(ds) write(ds,&c,1) | |
22 | ||
23 | ||
24 | char *devcul = "/dev/cul0"; | |
25 | char *devcua = "/dev/cua0"; | |
26 | char *lspeed = "300"; | |
27 | ||
28 | int ln; /* fd for comm line */ | |
29 | char tkill, terase; /* current input kill & erase */ | |
30 | int efk; /* process of id of listener */ | |
31 | char c; | |
32 | char oc; | |
33 | ||
34 | char *connmsg[] = { | |
35 | "", | |
36 | "line busy", | |
37 | "call dropped", | |
38 | "no carrier", | |
39 | "can't fork", | |
40 | "acu access", | |
41 | "tty access", | |
42 | "tty hung", | |
43 | "usage: cu telno [-t] [-s speed] [-l line] [-a acu]" | |
44 | }; | |
45 | ||
46 | rdc(ds) { | |
47 | ||
48 | ds=read(ds,&c,1); | |
49 | oc = c; | |
50 | c &= 0177; | |
51 | return (ds); | |
52 | } | |
53 | ||
54 | int intr; | |
55 | ||
56 | sig2() | |
57 | { | |
58 | signal(SIGINT, SIG_IGN); | |
59 | intr = 1; | |
60 | } | |
61 | ||
62 | int set14; | |
63 | ||
64 | xsleep(n) | |
65 | { | |
66 | xalarm(n); | |
67 | pause(); | |
68 | xalarm(0); | |
69 | } | |
70 | ||
71 | xalarm(n) | |
72 | { | |
73 | set14=n; | |
74 | alarm(n); | |
75 | } | |
76 | ||
77 | sig14() | |
78 | { | |
79 | signal(SIGALRM, sig14); | |
80 | if (set14) alarm(1); | |
81 | } | |
82 | ||
83 | int dout; | |
84 | int nhup; | |
85 | int dbflag; | |
86 | ||
87 | /* | |
88 | * main: get connection, set speed for line. | |
89 | * spawn child to invoke rd to read from line, output to fd 1 | |
90 | * main line invokes wr to read tty, write to line | |
91 | */ | |
92 | main(ac,av) | |
93 | char *av[]; | |
94 | { | |
95 | int fk; | |
96 | int speed; | |
97 | char *telno; | |
98 | struct sgttyb stbuf; | |
99 | ||
100 | signal(SIGALRM, sig14); | |
101 | if (ac < 2) { | |
102 | prf(connmsg[8]); | |
103 | exit(8); | |
104 | } | |
105 | for (; ac > 1; av++,ac--) { | |
106 | if (av[1][0] != '-') | |
107 | telno = av[1]; | |
108 | else switch(av[1][1]) { | |
109 | case 't': | |
110 | dout = 1; | |
111 | --ac; | |
112 | continue; | |
113 | case 'd': | |
114 | dbflag++; | |
115 | continue; | |
116 | case 's': | |
117 | lspeed = av[2]; ++av; --ac; | |
118 | break; | |
119 | case 'l': | |
120 | devcul = av[2]; ++av; --ac; | |
121 | break; | |
122 | case 'a': | |
123 | devcua = av[2]; ++av; --ac; | |
124 | break; | |
125 | case '0': case '1': case '2': case '3': case '4': | |
126 | case '5': case '6': case '7': case '8': case '9': | |
127 | devcua[strlen(devcua)-1] = av[1][1]; | |
128 | devcul[strlen(devcul)-1] = av[1][1]; | |
129 | break; | |
130 | default: | |
131 | prf("Bad flag %s", av[1]); | |
132 | break; | |
133 | } | |
134 | } | |
135 | if (!exists(devcua) || !exists(devcul)) | |
136 | exit(9); | |
137 | ln = conn(devcul, devcua, telno); | |
138 | if (ln < 0) { | |
139 | prf("Connect failed: %s",connmsg[-ln]); | |
140 | exit(-ln); | |
141 | } | |
142 | switch(atoi(lspeed)) { | |
143 | case 110: | |
144 | speed = B110;break; | |
145 | case 150: | |
146 | speed = B150;break; | |
147 | default: | |
148 | case 300: | |
149 | speed = B300;break; | |
150 | case 1200: | |
151 | speed = B1200;break; | |
152 | } | |
153 | stbuf.sg_ispeed = speed; | |
154 | stbuf.sg_ospeed = speed; | |
155 | stbuf.sg_flags = EVENP|ODDP; | |
156 | if (!dout) { | |
157 | stbuf.sg_flags |= RAW; | |
158 | stbuf.sg_flags &= ~ECHO; | |
159 | } | |
160 | ioctl(ln, TIOCSETP, &stbuf); | |
161 | ioctl(ln, TIOCEXCL, (struct sgttyb *)NULL); | |
162 | ioctl(ln, TIOCHPCL, (struct sgttyb *)NULL); | |
163 | prf("Connected"); | |
164 | if (dout) | |
165 | fk = -1; | |
166 | else | |
167 | fk = fork(); | |
168 | nhup = (int)signal(SIGINT, SIG_IGN); | |
169 | if (fk == 0) { | |
170 | chwrsig(); | |
171 | rd(); | |
172 | prf("\007Lost carrier"); | |
173 | exit(3); | |
174 | } | |
175 | mode(1); | |
176 | efk = fk; | |
177 | wr(); | |
178 | mode(0); | |
179 | kill(fk, SIGKILL); | |
180 | wait((int *)NULL); | |
181 | stbuf.sg_ispeed = 0; | |
182 | stbuf.sg_ospeed = 0; | |
183 | ioctl(ln, TIOCSETP, &stbuf); | |
184 | prf("Disconnected"); | |
185 | exit(0); | |
186 | } | |
187 | ||
188 | /* | |
189 | * conn: establish dial-out connection. | |
190 | * Example: fd = conn("/dev/ttyh","/dev/dn1","4500"); | |
191 | * Returns descriptor open to tty for reading and writing. | |
192 | * Negative values (-1...-7) denote errors in connmsg. | |
193 | * Uses alarm and fork/wait; requires sig14 handler. | |
194 | * Be sure to disconnect tty when done, via HUPCL or stty 0. | |
195 | */ | |
196 | ||
197 | conn(dev,acu,telno) | |
198 | char *dev, *acu, *telno; | |
199 | { | |
200 | struct sgttyb stbuf; | |
201 | extern errno; | |
202 | char *p, *q, b[30]; | |
203 | int er, fk, dn, dh, t; | |
204 | er=0; | |
205 | fk=(-1); | |
206 | if ((dn=open(acu,1))<0) { | |
207 | er=(errno == 6? 1:5); | |
208 | goto X; | |
209 | } | |
210 | if ((fk=fork()) == (-1)) { | |
211 | er=4; | |
212 | goto X; | |
213 | } | |
214 | if (fk == 0) { | |
215 | open(dev,2); | |
216 | for (;;) pause(); | |
217 | } | |
218 | xsleep(2); | |
219 | /* | |
220 | * copy phone #, assure EON | |
221 | */ | |
222 | p=b; | |
223 | q=telno; | |
224 | while (*p++=(*q++)) | |
225 | ; | |
226 | p--; | |
227 | if (*(p-1)!='<') { | |
228 | /*if (*(p-1)!='-') *p++='-';*/ | |
229 | *p++='<'; | |
230 | } | |
231 | t=p-b; | |
232 | xalarm(5*t); | |
233 | t=write(dn,b,t); | |
234 | xalarm(0); | |
235 | if (t<0) { | |
236 | er=2; | |
237 | goto X; | |
238 | } | |
239 | /* close(dn) */ | |
240 | xalarm(40); /* was 5; sometimes missed carrier */ | |
241 | dh = open(dev,2); | |
242 | xalarm(0); | |
243 | if (dh<0) { | |
244 | er=(errno == 4? 3:6); | |
245 | goto X; | |
246 | } | |
247 | ioctl(ln, TIOCGETP, &stbuf); | |
248 | stbuf.sg_flags &= ~ECHO; | |
249 | xalarm(10); | |
250 | ioctl(dh, TIOCSETP, &stbuf); | |
251 | ioctl(dh, TIOCHPCL, (struct sgttyb *)NULL); | |
252 | xalarm(0); | |
253 | X: | |
254 | if (er) close(dn); | |
255 | if (fk!=(-1)) { | |
256 | kill(fk, SIGKILL); | |
257 | xalarm(10); | |
258 | while ((t=wait((int *)NULL))!=(-1) && t!=fk); | |
259 | xalarm(0); | |
260 | } | |
261 | return (er? -er:dh); | |
262 | } | |
263 | ||
264 | /* | |
265 | * wr: write to remote: 0 -> line. | |
266 | * ~. terminate | |
267 | * ~<file send file | |
268 | * ~! local login-style shell | |
269 | * ~!cmd execute cmd locally | |
270 | * ~$proc execute proc locally, send output to line | |
271 | * ~%cmd execute builtin cmd (put and take) | |
272 | * ~# send 1-sec break | |
273 | */ | |
274 | ||
275 | wr() | |
276 | { | |
277 | int ds,fk,lcl,x; | |
278 | char *p,b[600]; | |
279 | for (;;) { | |
280 | p=b; | |
281 | while (rdc(0) == 1) { | |
282 | if (p == b) lcl=(c == '~'); | |
283 | if (p == b+1 && b[0] == '~') lcl=(c!='~'); | |
284 | /* if (c == 0) oc=c=0177; fake break kludge */ | |
285 | if (!lcl) { | |
286 | c = oc; | |
287 | if (wrc(ln) == 0) { | |
288 | prf("line gone"); return; | |
289 | } | |
290 | c &= 0177; | |
291 | } | |
292 | if (lcl) { | |
293 | if (c == 0177) c=tkill; | |
294 | if (c == '\r' || c == '\n') goto A; | |
295 | if (!dout) wrc(0); | |
296 | } | |
297 | *p++=c; | |
298 | if (c == terase) { | |
299 | p=p-2; | |
300 | if (p<b) p=b; | |
301 | } | |
302 | if (c == tkill || c == 0177 || c == '\4' || c == '\r' || c == '\n') p=b; | |
303 | } | |
304 | return; | |
305 | A: | |
306 | if (!dout) echo(""); | |
307 | *p=0; | |
308 | switch (b[1]) { | |
309 | case '.': | |
310 | case '\004': | |
311 | return; | |
312 | case '#': | |
313 | ioctl(ln, TIOCSBRK, 0); | |
314 | sleep(1); | |
315 | ioctl(ln, TIOCCBRK, 0); | |
316 | continue; | |
317 | case '!': | |
318 | case '$': | |
319 | fk = fork(); | |
320 | if (fk == 0) { | |
321 | char *getenv(); | |
322 | char *shell = getenv("SHELL"); | |
323 | if (shell == 0) shell = "/bin/sh"; | |
324 | close(1); | |
325 | dup(b[1] == '$'? ln:2); | |
326 | close(ln); | |
327 | mode(0); | |
328 | if (!nhup) signal(SIGINT, SIG_DFL); | |
329 | if (b[2] == 0) execl(shell,shell,0); | |
330 | /* if (b[2] == 0) execl(shell,"-",0); */ | |
331 | else execl(shell,"sh","-c",b+2,0); | |
332 | prf("Can't execute shell"); | |
333 | exit(~0); | |
334 | } | |
335 | if (fk!=(-1)) { | |
336 | while (wait(&x)!=fk); | |
337 | } | |
338 | mode(1); | |
339 | if (b[1] == '!') echo("!"); | |
340 | else { | |
341 | if (dout) echo("$"); | |
342 | } | |
343 | break; | |
344 | case '<': | |
345 | if (b[2] == 0) break; | |
346 | if ((ds=open(b+2,0))<0) { | |
347 | prf("Can't divert %s",b+1); | |
348 | break; | |
349 | } | |
350 | intr=x=0; | |
351 | mode(2); | |
352 | if (!nhup) signal(SIGINT, sig2); | |
353 | while (!intr && rdc(ds) == 1) { | |
354 | if (wrc(ln) == 0) { | |
355 | x=1; | |
356 | break; | |
357 | } | |
358 | } | |
359 | signal(SIGINT, SIG_IGN); | |
360 | close(ds); | |
361 | mode(1); | |
362 | if (x) return; | |
363 | if (dout) echo("<"); | |
364 | break; | |
365 | case '>': | |
366 | case ':': | |
367 | { | |
368 | FILE *fp; char tbuff[128]; register char *q; | |
369 | sprintf(tbuff,"/tmp/cu%d",efk); | |
370 | if(NULL==(fp = fopen(tbuff,"w"))) { | |
371 | prf("Can't tell other demon to divert"); | |
372 | break; | |
373 | } | |
374 | fprintf(fp,"%s\n",(b[1]=='>'?&b[2]: &b[1] )); | |
375 | if(dbflag) prf("name to be written in temporary:"),prf(&b[2]); | |
376 | fclose(fp); | |
377 | kill(efk,SIGEMT); | |
378 | } | |
379 | break; | |
380 | #ifdef SIGTSTP | |
381 | #define CTRLZ 26 | |
382 | case CTRLZ: | |
383 | mode(0); | |
384 | kill(getpid(), SIGTSTP); | |
385 | mode(1); | |
386 | break; | |
387 | #endif | |
388 | case '%': | |
389 | dopercen(&b[2]); | |
390 | break; | |
391 | default: | |
392 | prf("Use `~~' to start line with `~'"); | |
393 | } | |
394 | continue; | |
395 | } | |
396 | } | |
397 | ||
398 | dopercen(line) | |
399 | register char *line; | |
400 | { | |
401 | char *args[10]; | |
402 | register narg, f; | |
403 | int rcount; | |
404 | for (narg = 0; narg < 10;) { | |
405 | while(*line == ' ' || *line == '\t') | |
406 | line++; | |
407 | if (*line == '\0') | |
408 | break; | |
409 | args[narg++] = line; | |
410 | while(*line != '\0' && *line != ' ' && *line != '\t') | |
411 | line++; | |
412 | if (*line == '\0') | |
413 | break; | |
414 | *line++ = '\0'; | |
415 | } | |
416 | if (equal(args[0], "take")) { | |
417 | if (narg < 2) { | |
418 | prf("usage: ~%%take from [to]"); | |
419 | return; | |
420 | } | |
421 | if (narg < 3) | |
422 | args[2] = args[1]; | |
423 | wrln("echo '~>:'"); | |
424 | wrln(args[2]); | |
425 | wrln(";tee /dev/null <"); | |
426 | wrln(args[1]); | |
427 | wrln(";echo '~>'\n"); | |
428 | return; | |
429 | } else if (equal(args[0], "put")) { | |
430 | if (narg < 2) { | |
431 | prf("usage: ~%%put from [to]"); | |
432 | return; | |
433 | } | |
434 | if (narg < 3) | |
435 | args[2] = args[1]; | |
436 | if ((f = open(args[1], 0)) < 0) { | |
437 | prf("cannot open: %s", args[1]); | |
438 | return; | |
439 | } | |
440 | wrln("stty -echo;cat >"); | |
441 | wrln(args[2]); | |
442 | wrln(";stty echo\n"); | |
443 | xsleep(5); | |
444 | intr = 0; | |
445 | if (!nhup) | |
446 | signal(SIGINT, sig2); | |
447 | mode(2); | |
448 | rcount = 0; | |
449 | while(!intr && rdc(f) == 1) { | |
450 | rcount++; | |
451 | if (c == tkill || c == terase) | |
452 | wrln("\\"); | |
453 | if (wrc(ln) != 1) { | |
454 | xsleep(2); | |
455 | if (wrc(ln) != 1) { | |
456 | prf("character missed"); | |
457 | intr = 1; | |
458 | break; | |
459 | } | |
460 | } | |
461 | } | |
462 | signal(SIGINT, SIG_IGN); | |
463 | close(f); | |
464 | if (intr) { | |
465 | wrln("\n"); | |
466 | prf("stopped after %d bytes", rcount); | |
467 | } | |
468 | wrln("\004"); | |
469 | xsleep(5); | |
470 | mode(1); | |
471 | return; | |
472 | } | |
473 | prf("~%%%s unknown\n", args[0]); | |
474 | } | |
475 | ||
476 | equal(s1, s2) | |
477 | register char *s1, *s2; | |
478 | { | |
479 | while (*s1++ == *s2) | |
480 | if (*s2++ == '\0') | |
481 | return(1); | |
482 | return(0); | |
483 | } | |
484 | ||
485 | wrln(s) | |
486 | register char *s; | |
487 | { | |
488 | while (*s) | |
489 | write(ln, s++, 1); | |
490 | } | |
491 | /* chwrsig: Catch orders from wr process | |
492 | * to instigate diversion | |
493 | */ | |
494 | int whoami; | |
495 | chwrsig(){ | |
496 | int dodiver(); | |
497 | whoami = getpid(); | |
498 | signal(SIGEMT,dodiver); | |
499 | } | |
500 | int ds,slnt; | |
501 | int justrung; | |
502 | dodiver(){ | |
503 | static char dobuff[128], morejunk[256]; register char *cp; | |
504 | FILE *fp; | |
505 | justrung = 1; | |
506 | signal(SIGEMT,dodiver); | |
507 | sprintf(dobuff,"/tmp/cu%d",whoami); | |
508 | fp = fopen(dobuff,"r"); | |
509 | if(fp==NULL) prf("Couldn't open temporary"); | |
510 | unlink(dobuff); | |
511 | if(dbflag) { | |
512 | prf("Name of temporary:"); | |
513 | prf(dobuff); | |
514 | } | |
515 | fgets(dobuff,128,fp); fclose(fp); | |
516 | if(dbflag) { | |
517 | prf("Name of target file:"); | |
518 | prf(dobuff); | |
519 | } | |
520 | for(cp = dobuff-1; *++cp; ) /* squash newline */ | |
521 | if(*cp=='\n') *cp=0; | |
522 | cp = dobuff; | |
523 | if (*cp=='>') cp++; | |
524 | if (*cp==':') { | |
525 | cp++; | |
526 | if(*cp==0) { | |
527 | slnt ^= 1; | |
528 | return; | |
529 | } else { | |
530 | slnt = 1; | |
531 | } | |
532 | } | |
533 | if (ds >= 0) close(ds); | |
534 | if (*cp==0) { | |
535 | slnt = 0; | |
536 | ds = -1; | |
537 | return; | |
538 | } | |
539 | if (*dobuff!='>' || (ds=open(cp,1))<0) ds=creat(cp,0644); | |
540 | lseek(ds, (long)0, 2); | |
541 | if(ds < 0) prf("Creat failed:"), prf(cp); | |
542 | if (ds<0) prf("Can't divert %s",cp+1); | |
543 | } | |
544 | ||
545 | ||
546 | /* | |
547 | * rd: read from remote: line -> 1 | |
548 | * catch: | |
549 | * ~>[>][:][file] | |
550 | * stuff from file... | |
551 | * ~> (ends diversion) | |
552 | */ | |
553 | ||
554 | rd() | |
555 | { | |
556 | extern int ds,slnt; | |
557 | char *p,*q,b[600]; | |
558 | p=b; | |
559 | ds=(-1); | |
560 | agin: | |
561 | while (rdc(ln) == 1) { | |
562 | if (!slnt) wrc(1); | |
563 | *p++=c; | |
564 | if (c!='\n') continue; | |
565 | q=p; | |
566 | p=b; | |
567 | if (b[0]!='~' || b[1]!='>') { | |
568 | if (*(q-2) == '\r') { | |
569 | q--; | |
570 | *(q-1)=(*q); | |
571 | } | |
572 | if (ds>=0) write(ds,b,q-b); | |
573 | continue; | |
574 | } | |
575 | if (ds>=0) close(ds); | |
576 | if (slnt) { | |
577 | write(1, b, q - b); | |
578 | write(1, CRLF, sizeof(CRLF)); | |
579 | } | |
580 | if (*(q-2) == '\r') q--; | |
581 | *(q-1)=0; | |
582 | slnt=0; | |
583 | q=b+2; | |
584 | if (*q == '>') q++; | |
585 | if (*q == ':') { | |
586 | slnt=1; | |
587 | q++; | |
588 | } | |
589 | if (*q == 0) { | |
590 | ds=(-1); | |
591 | continue; | |
592 | } | |
593 | if (b[2]!='>' || (ds=open(q,1))<0) ds=creat(q,0644); | |
594 | lseek(ds, (long)0, 2); | |
595 | if (ds<0) prf("Can't divert %s",b+1); | |
596 | } | |
597 | if(justrung) { | |
598 | justrung = 0; | |
599 | goto agin; | |
600 | } | |
601 | } | |
602 | ||
603 | struct {char lobyte; char hibyte;}; | |
604 | mode(f) | |
605 | { | |
606 | struct sgttyb stbuf; | |
607 | if (dout) return; | |
608 | ioctl(0, TIOCGETP, &stbuf); | |
609 | tkill = stbuf.sg_kill; | |
610 | terase = stbuf.sg_erase; | |
611 | if (f == 0) { | |
612 | stbuf.sg_flags &= ~RAW; | |
613 | stbuf.sg_flags |= ECHO|CRMOD; | |
614 | } | |
615 | if (f == 1) { | |
616 | stbuf.sg_flags |= RAW; | |
617 | stbuf.sg_flags &= ~(ECHO|CRMOD); | |
618 | } | |
619 | if (f == 2) { | |
620 | stbuf.sg_flags &= ~RAW; | |
621 | stbuf.sg_flags &= ~(ECHO|CRMOD); | |
622 | } | |
623 | ioctl(0, TIOCSETP, &stbuf); | |
624 | } | |
625 | ||
626 | echo(s) | |
627 | char *s; | |
628 | { | |
629 | char *p; | |
630 | for (p=s;*p;p++); | |
631 | if (p>s) write(0,s,p-s); | |
632 | write(0,CRLF, sizeof(CRLF)); | |
633 | } | |
634 | ||
635 | prf(f, s) | |
636 | char *f; | |
637 | char *s; | |
638 | { | |
639 | fprintf(stderr, f, s); | |
640 | fprintf(stderr, CRLF); | |
641 | } | |
642 | ||
643 | exists(devname) | |
644 | char *devname; | |
645 | { | |
646 | if (access(devname, 0)==0) | |
647 | return(1); | |
648 | prf("%s does not exist", devname); | |
649 | return(0); | |
650 | } |