Commit | Line | Data |
---|---|---|
f18adf63 | 1 | #ifndef lint |
40bf00b7 | 2 | static char sccsid[] = "@(#)telnet.c 4.27 (Berkeley) %G%"; |
f18adf63 SL |
3 | #endif |
4 | ||
a19db822 BJ |
5 | /* |
6 | * User telnet program. | |
7 | */ | |
de3b21e8 SL |
8 | #include <sys/types.h> |
9 | #include <sys/socket.h> | |
fb8e28da | 10 | #include <sys/ioctl.h> |
de3b21e8 SL |
11 | |
12 | #include <netinet/in.h> | |
13 | ||
9c1dab9e SL |
14 | #define TELOPTS |
15 | #include <arpa/telnet.h> | |
16 | ||
a19db822 BJ |
17 | #include <stdio.h> |
18 | #include <ctype.h> | |
19 | #include <errno.h> | |
20 | #include <signal.h> | |
a19db822 | 21 | #include <setjmp.h> |
9f005877 | 22 | #include <netdb.h> |
de3b21e8 | 23 | |
a19db822 | 24 | #define strip(x) ((x)&0177) |
a19db822 BJ |
25 | |
26 | char ttyobuf[BUFSIZ], *tfrontp = ttyobuf, *tbackp = ttyobuf; | |
a50d5753 | 27 | char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf; |
a19db822 BJ |
28 | |
29 | char hisopts[256]; | |
30 | char myopts[256]; | |
31 | ||
32 | char doopt[] = { IAC, DO, '%', 'c', 0 }; | |
33 | char dont[] = { IAC, DONT, '%', 'c', 0 }; | |
34 | char will[] = { IAC, WILL, '%', 'c', 0 }; | |
35 | char wont[] = { IAC, WONT, '%', 'c', 0 }; | |
36 | ||
37 | int connected; | |
38 | int net; | |
fb8e28da | 39 | int showoptions = 0; |
19baf46e | 40 | int options; |
4971ba8c | 41 | int debug = 0; |
fb8e28da | 42 | int crmod = 0; |
a19db822 | 43 | char *prompt; |
fb8e28da | 44 | char escape = CTRL(]); |
a19db822 BJ |
45 | |
46 | char line[200]; | |
47 | int margc; | |
48 | char *margv[20]; | |
49 | ||
50 | jmp_buf toplevel; | |
51 | jmp_buf peerdied; | |
52 | ||
53 | extern int errno; | |
54 | ||
55 | int tn(), quit(), suspend(), bye(), help(); | |
de372207 | 56 | int setescape(), status(), toggle(), setoptions(); |
40bf00b7 | 57 | int setcrmod(), setdebug(), sendesc(), ayt(), intp(); |
a19db822 | 58 | |
a50d5753 | 59 | #define HELPINDENT (sizeof ("connect")) |
a19db822 BJ |
60 | |
61 | struct cmd { | |
f18adf63 SL |
62 | char *name; /* command name */ |
63 | char *help; /* help string */ | |
64 | int (*handler)(); /* routine which executes command */ | |
a19db822 BJ |
65 | }; |
66 | ||
f18adf63 SL |
67 | char openhelp[] = "connect to a site"; |
68 | char closehelp[] = "close current connection"; | |
69 | char quithelp[] = "exit telnet"; | |
70 | char zhelp[] = "suspend telnet"; | |
71 | char debughelp[] = "toggle debugging"; | |
72 | char escapehelp[] = "set escape character"; | |
73 | char statushelp[] = "print status information"; | |
74 | char helphelp[] = "print help information"; | |
75 | char optionshelp[] = "toggle viewing of options processing"; | |
76 | char crmodhelp[] = "toggle mapping of received carriage returns"; | |
40bf00b7 RC |
77 | char sendeschelp[] = "send escape character"; |
78 | char aythelp[] = "send Are You There"; | |
79 | char intphelp[] = "send Interrupt Process"; | |
a19db822 BJ |
80 | |
81 | struct cmd cmdtab[] = { | |
f18adf63 SL |
82 | { "open", openhelp, tn }, |
83 | { "close", closehelp, bye }, | |
84 | { "quit", quithelp, quit }, | |
a19db822 | 85 | { "z", zhelp, suspend }, |
f18adf63 SL |
86 | { "escape", escapehelp, setescape }, |
87 | { "status", statushelp, status }, | |
88 | { "options", optionshelp, setoptions }, | |
89 | { "crmod", crmodhelp, setcrmod }, | |
90 | { "debug", debughelp, setdebug }, | |
40bf00b7 RC |
91 | { "ayt", aythelp, ayt }, |
92 | { "interrupt", intphelp, intp }, | |
93 | { "passthru", sendeschelp, sendesc }, | |
f18adf63 | 94 | { "?", helphelp, help }, |
a19db822 BJ |
95 | 0 |
96 | }; | |
97 | ||
fb8e28da | 98 | struct sockaddr_in sin; |
a19db822 BJ |
99 | |
100 | int intr(), deadpeer(); | |
101 | char *control(); | |
102 | struct cmd *getcmd(); | |
9f005877 | 103 | struct servent *sp; |
a19db822 | 104 | |
ce292c83 SL |
105 | struct tchars otc; |
106 | struct ltchars oltc; | |
107 | struct sgttyb ottyb; | |
a50d5753 | 108 | |
a19db822 BJ |
109 | main(argc, argv) |
110 | int argc; | |
111 | char *argv[]; | |
112 | { | |
9f005877 SL |
113 | sp = getservbyname("telnet", "tcp"); |
114 | if (sp == 0) { | |
115 | fprintf(stderr, "telnet: tcp/telnet: unknown service\n"); | |
116 | exit(1); | |
117 | } | |
ce292c83 SL |
118 | ioctl(0, TIOCGETP, (char *)&ottyb); |
119 | ioctl(0, TIOCGETC, (char *)&otc); | |
120 | ioctl(0, TIOCGLTC, (char *)&oltc); | |
a19db822 BJ |
121 | setbuf(stdin, 0); |
122 | setbuf(stdout, 0); | |
123 | prompt = argv[0]; | |
87e91975 CL |
124 | if (argc > 1 && !strcmp(argv[1], "-d")) { |
125 | debug = 1; | |
126 | argv++; | |
127 | argc--; | |
128 | } | |
a19db822 BJ |
129 | if (argc != 1) { |
130 | if (setjmp(toplevel) != 0) | |
131 | exit(0); | |
132 | tn(argc, argv); | |
133 | } | |
134 | setjmp(toplevel); | |
135 | for (;;) | |
136 | command(1); | |
137 | } | |
138 | ||
150ad7e5 SL |
139 | char *hostname; |
140 | char hnamebuf[32]; | |
a19db822 BJ |
141 | |
142 | tn(argc, argv) | |
143 | int argc; | |
144 | char *argv[]; | |
145 | { | |
146 | register int c; | |
150ad7e5 | 147 | register struct hostent *host; |
a19db822 BJ |
148 | |
149 | if (connected) { | |
150ad7e5 | 150 | printf("?Already connected to %s\n", hostname); |
a19db822 BJ |
151 | return; |
152 | } | |
153 | if (argc < 2) { | |
154 | strcpy(line, "Connect "); | |
155 | printf("(to) "); | |
156 | gets(&line[strlen(line)]); | |
157 | makeargv(); | |
158 | argc = margc; | |
159 | argv = margv; | |
160 | } | |
161 | if (argc > 3) { | |
162 | printf("usage: %s host-name [port]\n", argv[0]); | |
163 | return; | |
164 | } | |
9f005877 | 165 | host = gethostbyname(argv[1]); |
150ad7e5 | 166 | if (host) { |
de3b21e8 SL |
167 | sin.sin_family = host->h_addrtype; |
168 | bcopy(host->h_addr, (caddr_t)&sin.sin_addr, host->h_length); | |
150ad7e5 SL |
169 | hostname = host->h_name; |
170 | } else { | |
de3b21e8 | 171 | sin.sin_family = AF_INET; |
150ad7e5 SL |
172 | sin.sin_addr.s_addr = inet_addr(argv[1]); |
173 | if (sin.sin_addr.s_addr == -1) { | |
174 | printf("%s: unknown host\n", argv[1]); | |
175 | return; | |
176 | } | |
177 | strcpy(hnamebuf, argv[1]); | |
178 | hostname = hnamebuf; | |
a19db822 | 179 | } |
9f005877 | 180 | sin.sin_port = sp->s_port; |
de372207 SL |
181 | if (argc == 3) { |
182 | sin.sin_port = atoi(argv[2]); | |
183 | if (sin.sin_port < 0) { | |
184 | printf("%s: bad port number\n", argv[2]); | |
185 | return; | |
186 | } | |
5eba30a3 | 187 | sin.sin_port = htons(sin.sin_port); |
de372207 | 188 | } |
40bf00b7 | 189 | net = socket(AF_INET, SOCK_STREAM, 0); |
de3b21e8 SL |
190 | if (net < 0) { |
191 | perror("telnet: socket"); | |
a19db822 BJ |
192 | return; |
193 | } | |
87e91975 CL |
194 | if (debug && |
195 | setsockopt(net, SOL_SOCKET, SO_DEBUG, &debug, sizeof(debug)) < 0) | |
f18adf63 | 196 | perror("setsockopt (SO_DEBUG)"); |
4ca10280 SL |
197 | signal(SIGINT, intr); |
198 | signal(SIGPIPE, deadpeer); | |
a19db822 | 199 | printf("Trying...\n"); |
40bf00b7 | 200 | if (connect(net, (caddr_t)&sin, sizeof (sin)) < 0) { |
de3b21e8 | 201 | perror("telnet: connect"); |
4ca10280 | 202 | signal(SIGINT, SIG_DFL); |
a19db822 BJ |
203 | return; |
204 | } | |
a19db822 BJ |
205 | connected++; |
206 | call(status, "status", 0); | |
207 | if (setjmp(peerdied) == 0) | |
208 | telnet(net); | |
209 | fprintf(stderr, "Connection closed by foreign host.\n"); | |
210 | exit(1); | |
211 | } | |
212 | ||
213 | /* | |
214 | * Print status about the connection. | |
215 | */ | |
216 | /*VARARGS*/ | |
217 | status() | |
218 | { | |
219 | if (connected) | |
150ad7e5 | 220 | printf("Connected to %s.\n", hostname); |
a19db822 BJ |
221 | else |
222 | printf("No connection.\n"); | |
223 | printf("Escape character is '%s'.\n", control(escape)); | |
fb8e28da | 224 | fflush(stdout); |
a19db822 BJ |
225 | } |
226 | ||
227 | makeargv() | |
228 | { | |
229 | register char *cp; | |
230 | register char **argp = margv; | |
231 | ||
232 | margc = 0; | |
233 | for (cp = line; *cp;) { | |
234 | while (isspace(*cp)) | |
235 | cp++; | |
236 | if (*cp == '\0') | |
237 | break; | |
238 | *argp++ = cp; | |
239 | margc += 1; | |
240 | while (*cp != '\0' && !isspace(*cp)) | |
241 | cp++; | |
242 | if (*cp == '\0') | |
243 | break; | |
244 | *cp++ = '\0'; | |
245 | } | |
246 | *argp++ = 0; | |
247 | } | |
248 | ||
249 | /*VARARGS*/ | |
250 | suspend() | |
251 | { | |
252 | register int save; | |
253 | ||
254 | save = mode(0); | |
a50d5753 SL |
255 | kill(0, SIGTSTP); |
256 | /* reget parameters in case they were changed */ | |
ce292c83 SL |
257 | ioctl(0, TIOCGETP, (char *)&ottyb); |
258 | ioctl(0, TIOCGETC, (char *)&otc); | |
259 | ioctl(0, TIOCGLTC, (char *)&oltc); | |
a50d5753 | 260 | (void) mode(save); |
a19db822 BJ |
261 | } |
262 | ||
263 | /*VARARGS*/ | |
264 | bye() | |
265 | { | |
a50d5753 | 266 | register char *op; |
a19db822 | 267 | |
a50d5753 | 268 | (void) mode(0); |
a19db822 | 269 | if (connected) { |
f18adf63 | 270 | shutdown(net, 2); |
a19db822 BJ |
271 | printf("Connection closed.\n"); |
272 | close(net); | |
273 | connected = 0; | |
a50d5753 SL |
274 | /* reset his options */ |
275 | for (op = hisopts; op < &hisopts[256]; op++) | |
276 | *op = 0; | |
a19db822 BJ |
277 | } |
278 | } | |
279 | ||
280 | /*VARARGS*/ | |
281 | quit() | |
282 | { | |
283 | call(bye, "bye", 0); | |
284 | exit(0); | |
285 | } | |
286 | ||
287 | /* | |
288 | * Help command. | |
a19db822 BJ |
289 | */ |
290 | help(argc, argv) | |
291 | int argc; | |
292 | char *argv[]; | |
293 | { | |
294 | register struct cmd *c; | |
295 | ||
296 | if (argc == 1) { | |
297 | printf("Commands may be abbreviated. Commands are:\n\n"); | |
298 | for (c = cmdtab; c->name; c++) | |
299 | printf("%-*s\t%s\n", HELPINDENT, c->name, c->help); | |
300 | return; | |
301 | } | |
302 | while (--argc > 0) { | |
303 | register char *arg; | |
304 | arg = *++argv; | |
305 | c = getcmd(arg); | |
306 | if (c == (struct cmd *)-1) | |
307 | printf("?Ambiguous help command %s\n", arg); | |
308 | else if (c == (struct cmd *)0) | |
309 | printf("?Invalid help command %s\n", arg); | |
310 | else | |
311 | printf("%s\n", c->help); | |
312 | } | |
313 | } | |
314 | ||
315 | /* | |
316 | * Call routine with argc, argv set from args (terminated by 0). | |
317 | * VARARGS2 | |
318 | */ | |
319 | call(routine, args) | |
320 | int (*routine)(); | |
321 | int args; | |
322 | { | |
323 | register int *argp; | |
324 | register int argc; | |
325 | ||
326 | for (argc = 0, argp = &args; *argp++ != 0; argc++) | |
327 | ; | |
328 | (*routine)(argc, &args); | |
329 | } | |
330 | ||
ce292c83 SL |
331 | struct tchars notc = { -1, -1, -1, -1, -1, -1 }; |
332 | struct ltchars noltc = { -1, -1, -1, -1, -1, -1 }; | |
fb8e28da | 333 | |
a19db822 BJ |
334 | mode(f) |
335 | register int f; | |
336 | { | |
a50d5753 | 337 | static int prevmode = 0; |
ce292c83 SL |
338 | struct tchars *tc; |
339 | struct ltchars *ltc; | |
340 | struct sgttyb sb; | |
341 | int onoff, old; | |
a50d5753 SL |
342 | |
343 | if (prevmode == f) | |
344 | return (f); | |
345 | old = prevmode; | |
346 | prevmode = f; | |
ce292c83 | 347 | sb = ottyb; |
a19db822 | 348 | switch (f) { |
a50d5753 | 349 | |
a19db822 | 350 | case 0: |
a19db822 | 351 | onoff = 0; |
fb8e28da | 352 | tc = &otc; |
ce292c83 | 353 | ltc = &oltc; |
a19db822 BJ |
354 | break; |
355 | ||
356 | case 1: | |
a19db822 | 357 | case 2: |
ce292c83 | 358 | sb.sg_flags |= CBREAK; |
a50d5753 | 359 | if (f == 1) |
ce292c83 | 360 | sb.sg_flags &= ~(ECHO|CRMOD); |
a50d5753 | 361 | else |
ce292c83 SL |
362 | sb.sg_flags |= ECHO|CRMOD; |
363 | sb.sg_erase = sb.sg_kill = -1; | |
fb8e28da | 364 | tc = ¬c; |
ce292c83 | 365 | ltc = &noltc; |
a19db822 | 366 | onoff = 1; |
fb8e28da SL |
367 | break; |
368 | ||
369 | default: | |
370 | return; | |
a19db822 | 371 | } |
ce292c83 SL |
372 | ioctl(fileno(stdin), TIOCSLTC, (char *)ltc); |
373 | ioctl(fileno(stdin), TIOCSETC, (char *)tc); | |
374 | ioctl(fileno(stdin), TIOCSETP, (char *)&sb); | |
a19db822 BJ |
375 | ioctl(fileno(stdin), FIONBIO, &onoff); |
376 | ioctl(fileno(stdout), FIONBIO, &onoff); | |
377 | return (old); | |
378 | } | |
379 | ||
380 | char sibuf[BUFSIZ], *sbp; | |
381 | char tibuf[BUFSIZ], *tbp; | |
382 | int scc, tcc; | |
383 | ||
384 | /* | |
385 | * Select from tty and network... | |
386 | */ | |
387 | telnet(s) | |
388 | int s; | |
389 | { | |
390 | register int c; | |
391 | int tin = fileno(stdin), tout = fileno(stdout); | |
392 | int on = 1; | |
393 | ||
a50d5753 | 394 | (void) mode(2); |
a19db822 | 395 | ioctl(s, FIONBIO, &on); |
40bf00b7 RC |
396 | if (!hisopts[TELOPT_SGA]) |
397 | willoption(TELOPT_SGA); | |
a19db822 BJ |
398 | for (;;) { |
399 | int ibits = 0, obits = 0; | |
400 | ||
401 | if (nfrontp - nbackp) | |
402 | obits |= (1 << s); | |
403 | else | |
404 | ibits |= (1 << tin); | |
405 | if (tfrontp - tbackp) | |
406 | obits |= (1 << tout); | |
407 | else | |
408 | ibits |= (1 << s); | |
409 | if (scc < 0 && tcc < 0) | |
410 | break; | |
de3b21e8 | 411 | select(16, &ibits, &obits, 0, 0); |
a19db822 BJ |
412 | if (ibits == 0 && obits == 0) { |
413 | sleep(5); | |
414 | continue; | |
415 | } | |
416 | ||
417 | /* | |
418 | * Something to read from the network... | |
419 | */ | |
420 | if (ibits & (1 << s)) { | |
a50d5753 | 421 | scc = read(s, sibuf, sizeof (sibuf)); |
a19db822 BJ |
422 | if (scc < 0 && errno == EWOULDBLOCK) |
423 | scc = 0; | |
424 | else { | |
425 | if (scc <= 0) | |
426 | break; | |
427 | sbp = sibuf; | |
428 | } | |
429 | } | |
430 | ||
431 | /* | |
432 | * Something to read from the tty... | |
433 | */ | |
434 | if (ibits & (1 << tin)) { | |
a50d5753 | 435 | tcc = read(tin, tibuf, sizeof (tibuf)); |
a19db822 BJ |
436 | if (tcc < 0 && errno == EWOULDBLOCK) |
437 | tcc = 0; | |
438 | else { | |
439 | if (tcc <= 0) | |
440 | break; | |
441 | tbp = tibuf; | |
442 | } | |
443 | } | |
444 | ||
445 | while (tcc > 0) { | |
446 | register int c; | |
447 | ||
448 | if ((&netobuf[BUFSIZ] - nfrontp) < 2) | |
449 | break; | |
450 | c = *tbp++ & 0377, tcc--; | |
451 | if (strip(c) == escape) { | |
452 | command(0); | |
453 | tcc = 0; | |
454 | break; | |
455 | } | |
40bf00b7 RC |
456 | switch (c) { |
457 | case '\n': | |
458 | if (!hisopts[TELOPT_ECHO]) | |
459 | *nfrontp++ = '\r'; | |
1698259c | 460 | *nfrontp++ = '\n'; |
40bf00b7 RC |
461 | break; |
462 | case '\r': | |
463 | *nfrontp++ = '\r'; | |
464 | if (hisopts[TELOPT_ECHO]) | |
465 | *nfrontp++ = '\n'; | |
466 | else | |
467 | *nfrontp++ = '\0'; | |
468 | break; | |
469 | case IAC: | |
470 | *nfrontp++ = IAC; | |
471 | /* fall into ... */ | |
472 | default: | |
473 | *nfrontp++ = c; | |
474 | break; | |
475 | } | |
a19db822 BJ |
476 | } |
477 | if ((obits & (1 << s)) && (nfrontp - nbackp) > 0) | |
478 | netflush(s); | |
479 | if (scc > 0) | |
480 | telrcv(); | |
481 | if ((obits & (1 << tout)) && (tfrontp - tbackp) > 0) | |
482 | ttyflush(tout); | |
483 | } | |
a50d5753 | 484 | (void) mode(0); |
a19db822 BJ |
485 | } |
486 | ||
487 | command(top) | |
488 | int top; | |
489 | { | |
490 | register struct cmd *c; | |
491 | int oldmode, wasopen; | |
492 | ||
493 | oldmode = mode(0); | |
494 | if (!top) | |
495 | putchar('\n'); | |
496 | else | |
4ca10280 | 497 | signal(SIGINT, SIG_DFL); |
a19db822 BJ |
498 | for (;;) { |
499 | printf("%s> ", prompt); | |
baba6eb5 SL |
500 | if (gets(line) == 0) { |
501 | if (feof(stdin)) { | |
502 | clearerr(stdin); | |
503 | putchar('\n'); | |
504 | } | |
a19db822 | 505 | break; |
baba6eb5 | 506 | } |
a19db822 BJ |
507 | if (line[0] == 0) |
508 | break; | |
509 | makeargv(); | |
510 | c = getcmd(margv[0]); | |
511 | if (c == (struct cmd *)-1) { | |
512 | printf("?Ambiguous command\n"); | |
513 | continue; | |
514 | } | |
515 | if (c == 0) { | |
516 | printf("?Invalid command\n"); | |
517 | continue; | |
518 | } | |
519 | (*c->handler)(margc, margv); | |
520 | if (c->handler != help) | |
521 | break; | |
522 | } | |
523 | if (!top) { | |
524 | if (!connected) | |
525 | longjmp(toplevel, 1); | |
a50d5753 | 526 | (void) mode(oldmode); |
a19db822 BJ |
527 | } |
528 | } | |
529 | ||
530 | /* | |
531 | * Telnet receiver states for fsm | |
532 | */ | |
533 | #define TS_DATA 0 | |
534 | #define TS_IAC 1 | |
535 | #define TS_WILL 2 | |
536 | #define TS_WONT 3 | |
537 | #define TS_DO 4 | |
538 | #define TS_DONT 5 | |
539 | ||
540 | telrcv() | |
541 | { | |
542 | register int c; | |
543 | static int state = TS_DATA; | |
544 | ||
545 | while (scc > 0) { | |
546 | c = *sbp++ & 0377, scc--; | |
547 | switch (state) { | |
548 | ||
549 | case TS_DATA: | |
fb8e28da | 550 | if (c == IAC) { |
a19db822 | 551 | state = TS_IAC; |
fb8e28da SL |
552 | continue; |
553 | } | |
554 | *tfrontp++ = c; | |
555 | /* | |
556 | * This hack is needed since we can't set | |
557 | * CRMOD on output only. Machines like MULTICS | |
558 | * like to send \r without \n; since we must | |
559 | * turn off CRMOD to get proper input, the mapping | |
560 | * is done here (sigh). | |
561 | */ | |
562 | if (c == '\r' && crmod) | |
563 | *tfrontp++ = '\n'; | |
a19db822 BJ |
564 | continue; |
565 | ||
566 | case TS_IAC: | |
567 | switch (c) { | |
568 | ||
569 | case WILL: | |
570 | state = TS_WILL; | |
571 | continue; | |
572 | ||
573 | case WONT: | |
574 | state = TS_WONT; | |
575 | continue; | |
576 | ||
577 | case DO: | |
578 | state = TS_DO; | |
579 | continue; | |
580 | ||
581 | case DONT: | |
582 | state = TS_DONT; | |
583 | continue; | |
584 | ||
585 | case DM: | |
586 | ioctl(fileno(stdout), TIOCFLUSH, 0); | |
587 | break; | |
588 | ||
589 | case NOP: | |
590 | case GA: | |
591 | break; | |
592 | ||
593 | default: | |
594 | break; | |
595 | } | |
596 | state = TS_DATA; | |
597 | continue; | |
598 | ||
599 | case TS_WILL: | |
9f005877 | 600 | printoption("RCVD", will, c, !hisopts[c]); |
a19db822 BJ |
601 | if (!hisopts[c]) |
602 | willoption(c); | |
603 | state = TS_DATA; | |
604 | continue; | |
605 | ||
606 | case TS_WONT: | |
9f005877 | 607 | printoption("RCVD", wont, c, hisopts[c]); |
a19db822 BJ |
608 | if (hisopts[c]) |
609 | wontoption(c); | |
610 | state = TS_DATA; | |
611 | continue; | |
612 | ||
613 | case TS_DO: | |
9f005877 | 614 | printoption("RCVD", doopt, c, !myopts[c]); |
a19db822 BJ |
615 | if (!myopts[c]) |
616 | dooption(c); | |
617 | state = TS_DATA; | |
618 | continue; | |
619 | ||
620 | case TS_DONT: | |
9f005877 | 621 | printoption("RCVD", dont, c, myopts[c]); |
a19db822 BJ |
622 | if (myopts[c]) { |
623 | myopts[c] = 0; | |
624 | sprintf(nfrontp, wont, c); | |
a50d5753 | 625 | nfrontp += sizeof (wont) - 2; |
9f005877 | 626 | printoption("SENT", wont, c); |
a19db822 BJ |
627 | } |
628 | state = TS_DATA; | |
629 | continue; | |
630 | } | |
631 | } | |
632 | } | |
633 | ||
634 | willoption(option) | |
635 | int option; | |
636 | { | |
637 | char *fmt; | |
638 | ||
639 | switch (option) { | |
640 | ||
641 | case TELOPT_ECHO: | |
a50d5753 | 642 | (void) mode(1); |
a19db822 BJ |
643 | |
644 | case TELOPT_SGA: | |
645 | hisopts[option] = 1; | |
646 | fmt = doopt; | |
647 | break; | |
648 | ||
649 | case TELOPT_TM: | |
650 | fmt = dont; | |
651 | break; | |
652 | ||
653 | default: | |
654 | fmt = dont; | |
655 | break; | |
656 | } | |
de372207 | 657 | sprintf(nfrontp, fmt, option); |
a50d5753 | 658 | nfrontp += sizeof (dont) - 2; |
9f005877 | 659 | printoption("SENT", fmt, option); |
a19db822 BJ |
660 | } |
661 | ||
662 | wontoption(option) | |
663 | int option; | |
664 | { | |
665 | char *fmt; | |
666 | ||
667 | switch (option) { | |
668 | ||
669 | case TELOPT_ECHO: | |
a50d5753 | 670 | (void) mode(2); |
a19db822 BJ |
671 | |
672 | case TELOPT_SGA: | |
673 | hisopts[option] = 0; | |
674 | fmt = dont; | |
675 | break; | |
676 | ||
677 | default: | |
678 | fmt = dont; | |
679 | } | |
680 | sprintf(nfrontp, fmt, option); | |
a50d5753 | 681 | nfrontp += sizeof (doopt) - 2; |
9f005877 | 682 | printoption("SENT", fmt, option); |
a19db822 BJ |
683 | } |
684 | ||
685 | dooption(option) | |
686 | int option; | |
687 | { | |
688 | char *fmt; | |
689 | ||
690 | switch (option) { | |
691 | ||
692 | case TELOPT_TM: | |
693 | fmt = wont; | |
694 | break; | |
680e328e SL |
695 | |
696 | case TELOPT_ECHO: | |
697 | (void) mode(2); | |
698 | fmt = will; | |
699 | hisopts[option] = 0; | |
700 | break; | |
a19db822 BJ |
701 | |
702 | case TELOPT_SGA: | |
703 | fmt = will; | |
704 | break; | |
705 | ||
706 | default: | |
707 | fmt = wont; | |
708 | break; | |
709 | } | |
710 | sprintf(nfrontp, fmt, option); | |
a50d5753 | 711 | nfrontp += sizeof (doopt) - 2; |
9f005877 | 712 | printoption("SENT", fmt, option); |
a19db822 BJ |
713 | } |
714 | ||
715 | /* | |
716 | * Set the escape character. | |
717 | */ | |
718 | setescape(argc, argv) | |
719 | int argc; | |
720 | char *argv[]; | |
721 | { | |
722 | register char *arg; | |
723 | char buf[50]; | |
724 | ||
725 | if (argc > 2) | |
726 | arg = argv[1]; | |
727 | else { | |
728 | printf("new escape character: "); | |
729 | gets(buf); | |
730 | arg = buf; | |
731 | } | |
732 | if (arg[0] != '\0') | |
733 | escape = arg[0]; | |
734 | printf("Escape character is '%s'.\n", control(escape)); | |
fb8e28da | 735 | fflush(stdout); |
a19db822 BJ |
736 | } |
737 | ||
de372207 SL |
738 | /*VARARGS*/ |
739 | setoptions() | |
740 | { | |
fb8e28da | 741 | |
de372207 SL |
742 | showoptions = !showoptions; |
743 | printf("%s show option processing.\n", showoptions ? "Will" : "Wont"); | |
fb8e28da SL |
744 | fflush(stdout); |
745 | } | |
746 | ||
747 | /*VARARGS*/ | |
748 | setcrmod() | |
749 | { | |
750 | ||
751 | crmod = !crmod; | |
752 | printf("%s map carriage return on output.\n", crmod ? "Will" : "Wont"); | |
753 | fflush(stdout); | |
de372207 SL |
754 | } |
755 | ||
4971ba8c SL |
756 | /*VARARGS*/ |
757 | setdebug() | |
758 | { | |
759 | ||
87e91975 | 760 | debug = debug ? 0 : 1; |
4971ba8c SL |
761 | printf("%s turn on socket level debugging.\n", |
762 | debug ? "Will" : "Wont"); | |
763 | fflush(stdout); | |
87e91975 CL |
764 | if (net > 0 && |
765 | setsockopt(net, SOL_SOCKET, SO_DEBUG, &debug, sizeof(debug)) < 0) | |
f18adf63 | 766 | perror("setsockopt (SO_DEBUG)"); |
4971ba8c SL |
767 | } |
768 | ||
40bf00b7 RC |
769 | sendesc() |
770 | { | |
771 | *nfrontp++ = escape; | |
772 | } | |
773 | ||
774 | ayt() | |
775 | { | |
776 | *nfrontp++ = IAC; | |
777 | *nfrontp++ = AYT; | |
778 | } | |
779 | ||
780 | intp() | |
781 | { | |
782 | *nfrontp++ = IAC; | |
783 | *nfrontp++ = IP; | |
784 | } | |
785 | ||
a19db822 BJ |
786 | /* |
787 | * Construct a control character sequence | |
788 | * for a special character. | |
789 | */ | |
790 | char * | |
791 | control(c) | |
792 | register int c; | |
793 | { | |
794 | static char buf[3]; | |
795 | ||
796 | if (c == 0177) | |
797 | return ("^?"); | |
798 | if (c >= 040) { | |
799 | buf[0] = c; | |
800 | buf[1] = 0; | |
801 | } else { | |
802 | buf[0] = '^'; | |
803 | buf[1] = '@'+c; | |
804 | buf[2] = 0; | |
805 | } | |
806 | return (buf); | |
807 | } | |
808 | ||
809 | struct cmd * | |
810 | getcmd(name) | |
811 | register char *name; | |
812 | { | |
813 | register char *p, *q; | |
814 | register struct cmd *c, *found; | |
815 | register int nmatches, longest; | |
816 | ||
817 | longest = 0; | |
818 | nmatches = 0; | |
819 | found = 0; | |
820 | for (c = cmdtab; p = c->name; c++) { | |
821 | for (q = name; *q == *p++; q++) | |
822 | if (*q == 0) /* exact match? */ | |
823 | return (c); | |
824 | if (!*q) { /* the name was a prefix */ | |
825 | if (q - name > longest) { | |
826 | longest = q - name; | |
827 | nmatches = 1; | |
828 | found = c; | |
829 | } else if (q - name == longest) | |
830 | nmatches++; | |
831 | } | |
832 | } | |
833 | if (nmatches > 1) | |
834 | return ((struct cmd *)-1); | |
835 | return (found); | |
836 | } | |
837 | ||
838 | deadpeer() | |
839 | { | |
a50d5753 | 840 | (void) mode(0); |
a19db822 BJ |
841 | longjmp(peerdied, -1); |
842 | } | |
843 | ||
844 | intr() | |
845 | { | |
a50d5753 | 846 | (void) mode(0); |
a19db822 BJ |
847 | longjmp(toplevel, -1); |
848 | } | |
849 | ||
850 | ttyflush(fd) | |
851 | { | |
852 | int n; | |
853 | ||
854 | if ((n = tfrontp - tbackp) > 0) | |
855 | n = write(fd, tbackp, n); | |
9f005877 SL |
856 | if (n < 0) |
857 | return; | |
a19db822 BJ |
858 | tbackp += n; |
859 | if (tbackp == tfrontp) | |
860 | tbackp = tfrontp = ttyobuf; | |
861 | } | |
862 | ||
863 | netflush(fd) | |
864 | { | |
865 | int n; | |
866 | ||
867 | if ((n = nfrontp - nbackp) > 0) | |
868 | n = write(fd, nbackp, n); | |
f103d8a9 SL |
869 | if (n < 0) { |
870 | if (errno != ENOBUFS && errno != EWOULDBLOCK) { | |
a50d5753 | 871 | (void) mode(0); |
150ad7e5 | 872 | perror(hostname); |
f103d8a9 SL |
873 | close(fd); |
874 | longjmp(peerdied, -1); | |
875 | /*NOTREACHED*/ | |
876 | } | |
a19db822 | 877 | n = 0; |
f103d8a9 | 878 | } |
a19db822 BJ |
879 | nbackp += n; |
880 | if (nbackp == nfrontp) | |
881 | nbackp = nfrontp = netobuf; | |
882 | } | |
de372207 | 883 | |
6cebba9f BJ |
884 | /*VARARGS*/ |
885 | printoption(direction, fmt, option, what) | |
de372207 | 886 | char *direction, *fmt; |
6cebba9f | 887 | int option, what; |
de372207 | 888 | { |
9f005877 SL |
889 | if (!showoptions) |
890 | return; | |
de372207 SL |
891 | printf("%s ", direction); |
892 | if (fmt == doopt) | |
893 | fmt = "do"; | |
894 | else if (fmt == dont) | |
895 | fmt = "dont"; | |
896 | else if (fmt == will) | |
897 | fmt = "will"; | |
898 | else if (fmt == wont) | |
899 | fmt = "wont"; | |
900 | else | |
901 | fmt = "???"; | |
902 | if (option < TELOPT_SUPDUP) | |
6cebba9f | 903 | printf("%s %s", fmt, telopts[option]); |
de372207 | 904 | else |
6cebba9f BJ |
905 | printf("%s %d", fmt, option); |
906 | if (*direction == '<') { | |
907 | printf("\r\n"); | |
908 | return; | |
909 | } | |
910 | printf(" (%s)\r\n", what ? "reply" : "don't reply"); | |
de372207 | 911 | } |