eaf1e20a |
1 | /* |
2 | * Telnet backend. |
3 | */ |
4 | |
374330e2 |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
374330e2 |
7 | |
8 | #include "putty.h" |
9 | |
10 | #ifndef FALSE |
11 | #define FALSE 0 |
12 | #endif |
13 | #ifndef TRUE |
14 | #define TRUE 1 |
15 | #endif |
16 | |
32874aea |
17 | #define IAC 255 /* interpret as command: */ |
18 | #define DONT 254 /* you are not to use option */ |
19 | #define DO 253 /* please, you use option */ |
20 | #define WONT 252 /* I won't use option */ |
21 | #define WILL 251 /* I will use option */ |
22 | #define SB 250 /* interpret as subnegotiation */ |
23 | #define SE 240 /* end sub negotiation */ |
24 | |
25 | #define GA 249 /* you may reverse the line */ |
26 | #define EL 248 /* erase the current line */ |
27 | #define EC 247 /* erase the current character */ |
28 | #define AYT 246 /* are you there */ |
29 | #define AO 245 /* abort output--but let prog finish */ |
30 | #define IP 244 /* interrupt process--permanently */ |
31 | #define BREAK 243 /* break */ |
32 | #define DM 242 /* data mark--for connect. cleaning */ |
33 | #define NOP 241 /* nop */ |
34 | #define EOR 239 /* end of record (transparent mode) */ |
35 | #define ABORT 238 /* Abort process */ |
36 | #define SUSP 237 /* Suspend process */ |
37 | #define xEOF 236 /* End of file: EOF is already used... */ |
38 | |
6196fb7e |
39 | #define TELOPTS(X) \ |
40 | X(BINARY, 0) /* 8-bit data path */ \ |
41 | X(ECHO, 1) /* echo */ \ |
42 | X(RCP, 2) /* prepare to reconnect */ \ |
43 | X(SGA, 3) /* suppress go ahead */ \ |
44 | X(NAMS, 4) /* approximate message size */ \ |
45 | X(STATUS, 5) /* give status */ \ |
46 | X(TM, 6) /* timing mark */ \ |
47 | X(RCTE, 7) /* remote controlled transmission and echo */ \ |
48 | X(NAOL, 8) /* negotiate about output line width */ \ |
49 | X(NAOP, 9) /* negotiate about output page size */ \ |
50 | X(NAOCRD, 10) /* negotiate about CR disposition */ \ |
51 | X(NAOHTS, 11) /* negotiate about horizontal tabstops */ \ |
52 | X(NAOHTD, 12) /* negotiate about horizontal tab disposition */ \ |
53 | X(NAOFFD, 13) /* negotiate about formfeed disposition */ \ |
54 | X(NAOVTS, 14) /* negotiate about vertical tab stops */ \ |
55 | X(NAOVTD, 15) /* negotiate about vertical tab disposition */ \ |
56 | X(NAOLFD, 16) /* negotiate about output LF disposition */ \ |
57 | X(XASCII, 17) /* extended ascic character set */ \ |
58 | X(LOGOUT, 18) /* force logout */ \ |
59 | X(BM, 19) /* byte macro */ \ |
60 | X(DET, 20) /* data entry terminal */ \ |
61 | X(SUPDUP, 21) /* supdup protocol */ \ |
62 | X(SUPDUPOUTPUT, 22) /* supdup output */ \ |
63 | X(SNDLOC, 23) /* send location */ \ |
64 | X(TTYPE, 24) /* terminal type */ \ |
65 | X(EOR, 25) /* end or record */ \ |
66 | X(TUID, 26) /* TACACS user identification */ \ |
67 | X(OUTMRK, 27) /* output marking */ \ |
68 | X(TTYLOC, 28) /* terminal location number */ \ |
69 | X(3270REGIME, 29) /* 3270 regime */ \ |
70 | X(X3PAD, 30) /* X.3 PAD */ \ |
71 | X(NAWS, 31) /* window size */ \ |
72 | X(TSPEED, 32) /* terminal speed */ \ |
73 | X(LFLOW, 33) /* remote flow control */ \ |
74 | X(LINEMODE, 34) /* Linemode option */ \ |
75 | X(XDISPLOC, 35) /* X Display Location */ \ |
76 | X(OLD_ENVIRON, 36) /* Old - Environment variables */ \ |
77 | X(AUTHENTICATION, 37) /* Authenticate */ \ |
78 | X(ENCRYPT, 38) /* Encryption option */ \ |
79 | X(NEW_ENVIRON, 39) /* New - Environment variables */ \ |
80 | X(TN3270E, 40) /* TN3270 enhancements */ \ |
81 | X(XAUTH, 41) \ |
82 | X(CHARSET, 42) /* Character set */ \ |
83 | X(RSP, 43) /* Remote serial port */ \ |
84 | X(COM_PORT_OPTION, 44) /* Com port control */ \ |
85 | X(SLE, 45) /* Suppress local echo */ \ |
86 | X(STARTTLS, 46) /* Start TLS */ \ |
87 | X(KERMIT, 47) /* Automatic Kermit file transfer */ \ |
88 | X(SEND_URL, 48) \ |
89 | X(FORWARD_X, 49) \ |
90 | X(PRAGMA_LOGON, 138) \ |
91 | X(SSPI_LOGON, 139) \ |
92 | X(PRAGMA_HEARTBEAT, 140) \ |
93 | X(EXOPL, 255) /* extended-options-list */ |
94 | |
95 | #define telnet_enum(x,y) TELOPT_##x = y, |
96 | enum { TELOPTS(telnet_enum) dummy=0 }; |
97 | #undef telnet_enum |
32874aea |
98 | |
99 | #define TELQUAL_IS 0 /* option is... */ |
100 | #define TELQUAL_SEND 1 /* send option */ |
101 | #define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */ |
374330e2 |
102 | #define BSD_VAR 1 |
103 | #define BSD_VALUE 0 |
104 | #define RFC_VAR 0 |
105 | #define RFC_VALUE 1 |
106 | |
107 | #define CR 13 |
108 | #define LF 10 |
109 | #define NUL 0 |
110 | |
656fa244 |
111 | #define iswritable(x) \ |
112 | ( (x) != IAC && \ |
113 | (telnet->opt_states[o_we_bin.index] == ACTIVE || (x) != CR)) |
374330e2 |
114 | |
32874aea |
115 | static char *telopt(int opt) |
116 | { |
6196fb7e |
117 | #define telnet_str(x,y) case TELOPT_##x: return #x; |
118 | switch (opt) { |
119 | TELOPTS(telnet_str) |
120 | default: |
121 | return "<unknown>"; |
122 | } |
123 | #undef telnet_str |
374330e2 |
124 | } |
125 | |
51470298 |
126 | static void telnet_size(void *handle, int width, int height); |
374330e2 |
127 | |
128 | struct Opt { |
129 | int send; /* what we initially send */ |
130 | int nsend; /* -ve send if requested to stop it */ |
131 | int ack, nak; /* +ve and -ve acknowledgements */ |
132 | int option; /* the option code */ |
51470298 |
133 | int index; /* index into telnet->opt_states[] */ |
374330e2 |
134 | enum { |
135 | REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE |
51470298 |
136 | } initial_state; |
137 | }; |
138 | |
139 | enum { |
140 | OPTINDEX_NAWS, |
141 | OPTINDEX_TSPEED, |
142 | OPTINDEX_TTYPE, |
143 | OPTINDEX_OENV, |
144 | OPTINDEX_NENV, |
145 | OPTINDEX_ECHO, |
146 | OPTINDEX_WE_SGA, |
147 | OPTINDEX_THEY_SGA, |
656fa244 |
148 | OPTINDEX_WE_BIN, |
149 | OPTINDEX_THEY_BIN, |
51470298 |
150 | NUM_OPTS |
374330e2 |
151 | }; |
152 | |
51470298 |
153 | static const struct Opt o_naws = |
154 | { WILL, WONT, DO, DONT, TELOPT_NAWS, OPTINDEX_NAWS, REQUESTED }; |
155 | static const struct Opt o_tspeed = |
156 | { WILL, WONT, DO, DONT, TELOPT_TSPEED, OPTINDEX_TSPEED, REQUESTED }; |
157 | static const struct Opt o_ttype = |
158 | { WILL, WONT, DO, DONT, TELOPT_TTYPE, OPTINDEX_TTYPE, REQUESTED }; |
5f95fdf1 |
159 | static const struct Opt o_oenv = |
160 | { WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON, OPTINDEX_OENV, INACTIVE }; |
161 | static const struct Opt o_nenv = |
162 | { WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON, OPTINDEX_NENV, REQUESTED }; |
51470298 |
163 | static const struct Opt o_echo = |
164 | { DO, DONT, WILL, WONT, TELOPT_ECHO, OPTINDEX_ECHO, REQUESTED }; |
165 | static const struct Opt o_we_sga = |
166 | { WILL, WONT, DO, DONT, TELOPT_SGA, OPTINDEX_WE_SGA, REQUESTED }; |
167 | static const struct Opt o_they_sga = |
168 | { DO, DONT, WILL, WONT, TELOPT_SGA, OPTINDEX_THEY_SGA, REQUESTED }; |
656fa244 |
169 | static const struct Opt o_we_bin = |
170 | { WILL, WONT, DO, DONT, TELOPT_BINARY, OPTINDEX_WE_BIN, INACTIVE }; |
171 | static const struct Opt o_they_bin = |
172 | { DO, DONT, WILL, WONT, TELOPT_BINARY, OPTINDEX_THEY_BIN, INACTIVE }; |
51470298 |
173 | |
174 | static const struct Opt *const opts[] = { |
374330e2 |
175 | &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo, |
656fa244 |
176 | &o_we_sga, &o_they_sga, &o_we_bin, &o_they_bin, NULL |
374330e2 |
177 | }; |
178 | |
51470298 |
179 | typedef struct telnet_tag { |
180 | const struct plug_function_table *fn; |
181 | /* the above field _must_ be first in the structure */ |
182 | |
183 | Socket s; |
184 | |
185 | void *frontend; |
b9d7bcad |
186 | void *ldisc; |
51470298 |
187 | int term_width, term_height; |
188 | |
189 | int opt_states[NUM_OPTS]; |
190 | |
191 | int echoing, editing; |
192 | int activated; |
193 | int bufsize; |
194 | int in_synch; |
195 | int sb_opt, sb_len; |
a1fd562d |
196 | unsigned char *sb_buf; |
51470298 |
197 | int sb_size; |
198 | |
199 | enum { |
200 | TOP_LEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT, |
201 | SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR |
202 | } state; |
203 | |
86916870 |
204 | Config cfg; |
39934deb |
205 | |
206 | Pinger pinger; |
51470298 |
207 | } *Telnet; |
208 | |
5471d09a |
209 | #define TELNET_MAX_BACKLOG 4096 |
210 | |
374330e2 |
211 | #define SB_DELTA 1024 |
212 | |
ee00c99a |
213 | static void c_write(Telnet telnet, char *buf, int len) |
32874aea |
214 | { |
5471d09a |
215 | int backlog; |
ee00c99a |
216 | backlog = from_backend(telnet->frontend, 0, buf, len); |
51470298 |
217 | sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG); |
fe50e814 |
218 | } |
219 | |
a8327734 |
220 | static void log_option(Telnet telnet, char *sender, int cmd, int option) |
32874aea |
221 | { |
57356d63 |
222 | char *buf; |
24d7f854 |
223 | /* |
224 | * The strange-looking "<?""?>" below is there to avoid a |
225 | * trigraph - a double question mark followed by > maps to a |
226 | * closing brace character! |
227 | */ |
57356d63 |
228 | buf = dupprintf("%s:\t%s %s", sender, |
229 | (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" : |
230 | cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<?""?>"), |
231 | telopt(option)); |
a8327734 |
232 | logevent(telnet->frontend, buf); |
57356d63 |
233 | sfree(buf); |
374330e2 |
234 | } |
235 | |
51470298 |
236 | static void send_opt(Telnet telnet, int cmd, int option) |
32874aea |
237 | { |
374330e2 |
238 | unsigned char b[3]; |
239 | |
32874aea |
240 | b[0] = IAC; |
241 | b[1] = cmd; |
242 | b[2] = option; |
a1fd562d |
243 | telnet->bufsize = sk_write(telnet->s, (char *)b, 3); |
a8327734 |
244 | log_option(telnet, "client", cmd, option); |
374330e2 |
245 | } |
246 | |
51470298 |
247 | static void deactivate_option(Telnet telnet, const struct Opt *o) |
32874aea |
248 | { |
51470298 |
249 | if (telnet->opt_states[o->index] == REQUESTED || |
250 | telnet->opt_states[o->index] == ACTIVE) |
251 | send_opt(telnet, o->nsend, o->option); |
252 | telnet->opt_states[o->index] = REALLY_INACTIVE; |
374330e2 |
253 | } |
254 | |
708bbbbe |
255 | /* |
256 | * Generate side effects of enabling or disabling an option. |
257 | */ |
51470298 |
258 | static void option_side_effects(Telnet telnet, const struct Opt *o, int enabled) |
32874aea |
259 | { |
0965bee0 |
260 | if (o->option == TELOPT_ECHO && o->send == DO) |
51470298 |
261 | telnet->echoing = !enabled; |
b6c680d4 |
262 | else if (o->option == TELOPT_SGA && o->send == DO) |
51470298 |
263 | telnet->editing = !enabled; |
b9d7bcad |
264 | if (telnet->ldisc) /* cause ldisc to notice the change */ |
265 | ldisc_send(telnet->ldisc, NULL, 0, 0); |
8faa456c |
266 | |
267 | /* Ensure we get the minimum options */ |
51470298 |
268 | if (!telnet->activated) { |
269 | if (telnet->opt_states[o_echo.index] == INACTIVE) { |
270 | telnet->opt_states[o_echo.index] = REQUESTED; |
271 | send_opt(telnet, o_echo.send, o_echo.option); |
8faa456c |
272 | } |
51470298 |
273 | if (telnet->opt_states[o_we_sga.index] == INACTIVE) { |
274 | telnet->opt_states[o_we_sga.index] = REQUESTED; |
275 | send_opt(telnet, o_we_sga.send, o_we_sga.option); |
8faa456c |
276 | } |
51470298 |
277 | if (telnet->opt_states[o_they_sga.index] == INACTIVE) { |
278 | telnet->opt_states[o_they_sga.index] = REQUESTED; |
279 | send_opt(telnet, o_they_sga.send, o_they_sga.option); |
8faa456c |
280 | } |
51470298 |
281 | telnet->activated = TRUE; |
8faa456c |
282 | } |
708bbbbe |
283 | } |
284 | |
51470298 |
285 | static void activate_option(Telnet telnet, const struct Opt *o) |
32874aea |
286 | { |
374330e2 |
287 | if (o->send == WILL && o->option == TELOPT_NAWS) |
51470298 |
288 | telnet_size(telnet, telnet->term_width, telnet->term_height); |
374330e2 |
289 | if (o->send == WILL && |
290 | (o->option == TELOPT_NEW_ENVIRON || |
291 | o->option == TELOPT_OLD_ENVIRON)) { |
292 | /* |
293 | * We may only have one kind of ENVIRON going at a time. |
294 | * This is a hack, but who cares. |
295 | */ |
51470298 |
296 | deactivate_option(telnet, o->option == |
32874aea |
297 | TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv); |
374330e2 |
298 | } |
51470298 |
299 | option_side_effects(telnet, o, 1); |
374330e2 |
300 | } |
301 | |
51470298 |
302 | static void refused_option(Telnet telnet, const struct Opt *o) |
32874aea |
303 | { |
374330e2 |
304 | if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON && |
51470298 |
305 | telnet->opt_states[o_oenv.index] == INACTIVE) { |
306 | send_opt(telnet, WILL, TELOPT_OLD_ENVIRON); |
307 | telnet->opt_states[o_oenv.index] = REQUESTED; |
374330e2 |
308 | } |
51470298 |
309 | option_side_effects(telnet, o, 0); |
374330e2 |
310 | } |
311 | |
51470298 |
312 | static void proc_rec_opt(Telnet telnet, int cmd, int option) |
32874aea |
313 | { |
51470298 |
314 | const struct Opt *const *o; |
374330e2 |
315 | |
a8327734 |
316 | log_option(telnet, "server", cmd, option); |
374330e2 |
317 | for (o = opts; *o; o++) { |
318 | if ((*o)->option == option && (*o)->ack == cmd) { |
51470298 |
319 | switch (telnet->opt_states[(*o)->index]) { |
374330e2 |
320 | case REQUESTED: |
51470298 |
321 | telnet->opt_states[(*o)->index] = ACTIVE; |
322 | activate_option(telnet, *o); |
374330e2 |
323 | break; |
324 | case ACTIVE: |
325 | break; |
326 | case INACTIVE: |
51470298 |
327 | telnet->opt_states[(*o)->index] = ACTIVE; |
328 | send_opt(telnet, (*o)->send, option); |
329 | activate_option(telnet, *o); |
374330e2 |
330 | break; |
331 | case REALLY_INACTIVE: |
51470298 |
332 | send_opt(telnet, (*o)->nsend, option); |
374330e2 |
333 | break; |
334 | } |
335 | return; |
336 | } else if ((*o)->option == option && (*o)->nak == cmd) { |
51470298 |
337 | switch (telnet->opt_states[(*o)->index]) { |
374330e2 |
338 | case REQUESTED: |
51470298 |
339 | telnet->opt_states[(*o)->index] = INACTIVE; |
340 | refused_option(telnet, *o); |
374330e2 |
341 | break; |
342 | case ACTIVE: |
51470298 |
343 | telnet->opt_states[(*o)->index] = INACTIVE; |
344 | send_opt(telnet, (*o)->nsend, option); |
345 | option_side_effects(telnet, *o, 0); |
374330e2 |
346 | break; |
347 | case INACTIVE: |
348 | case REALLY_INACTIVE: |
349 | break; |
350 | } |
351 | return; |
352 | } |
353 | } |
354 | /* |
355 | * If we reach here, the option was one we weren't prepared to |
108b0b94 |
356 | * cope with. If the request was positive (WILL or DO), we send |
357 | * a negative ack to indicate refusal. If the request was |
358 | * negative (WONT / DONT), we must do nothing. |
374330e2 |
359 | */ |
108b0b94 |
360 | if (cmd == WILL || cmd == DO) |
361 | send_opt(telnet, (cmd == WILL ? DONT : WONT), option); |
374330e2 |
362 | } |
363 | |
51470298 |
364 | static void process_subneg(Telnet telnet) |
32874aea |
365 | { |
374330e2 |
366 | unsigned char b[2048], *p, *q; |
367 | int var, value, n; |
368 | char *e; |
369 | |
51470298 |
370 | switch (telnet->sb_opt) { |
374330e2 |
371 | case TELOPT_TSPEED: |
51470298 |
372 | if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) { |
57356d63 |
373 | char *logbuf; |
32874aea |
374 | b[0] = IAC; |
375 | b[1] = SB; |
376 | b[2] = TELOPT_TSPEED; |
374330e2 |
377 | b[3] = TELQUAL_IS; |
86916870 |
378 | strcpy((char *)(b + 4), telnet->cfg.termspeed); |
379 | n = 4 + strlen(telnet->cfg.termspeed); |
32874aea |
380 | b[n] = IAC; |
381 | b[n + 1] = SE; |
a1fd562d |
382 | telnet->bufsize = sk_write(telnet->s, (char *)b, n + 2); |
a8327734 |
383 | logevent(telnet->frontend, "server:\tSB TSPEED SEND"); |
86916870 |
384 | logbuf = dupprintf("client:\tSB TSPEED IS %s", telnet->cfg.termspeed); |
a8327734 |
385 | logevent(telnet->frontend, logbuf); |
57356d63 |
386 | sfree(logbuf); |
374330e2 |
387 | } else |
a8327734 |
388 | logevent(telnet->frontend, "server:\tSB TSPEED <something weird>"); |
374330e2 |
389 | break; |
390 | case TELOPT_TTYPE: |
51470298 |
391 | if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) { |
57356d63 |
392 | char *logbuf; |
32874aea |
393 | b[0] = IAC; |
394 | b[1] = SB; |
395 | b[2] = TELOPT_TTYPE; |
374330e2 |
396 | b[3] = TELQUAL_IS; |
86916870 |
397 | for (n = 0; telnet->cfg.termtype[n]; n++) |
398 | b[n + 4] = (telnet->cfg.termtype[n] >= 'a' |
399 | && telnet->cfg.termtype[n] <= |
400 | 'z' ? telnet->cfg.termtype[n] + 'A' - |
401 | 'a' : telnet->cfg.termtype[n]); |
32874aea |
402 | b[n + 4] = IAC; |
403 | b[n + 5] = SE; |
a1fd562d |
404 | telnet->bufsize = sk_write(telnet->s, (char *)b, n + 6); |
32874aea |
405 | b[n + 4] = 0; |
a8327734 |
406 | logevent(telnet->frontend, "server:\tSB TTYPE SEND"); |
57356d63 |
407 | logbuf = dupprintf("client:\tSB TTYPE IS %s", b + 4); |
a8327734 |
408 | logevent(telnet->frontend, logbuf); |
57356d63 |
409 | sfree(logbuf); |
374330e2 |
410 | } else |
a8327734 |
411 | logevent(telnet->frontend, "server:\tSB TTYPE <something weird>\r\n"); |
374330e2 |
412 | break; |
413 | case TELOPT_OLD_ENVIRON: |
32874aea |
414 | case TELOPT_NEW_ENVIRON: |
51470298 |
415 | p = telnet->sb_buf; |
416 | q = p + telnet->sb_len; |
374330e2 |
417 | if (p < q && *p == TELQUAL_SEND) { |
57356d63 |
418 | char *logbuf; |
374330e2 |
419 | p++; |
57356d63 |
420 | logbuf = dupprintf("server:\tSB %s SEND", telopt(telnet->sb_opt)); |
a8327734 |
421 | logevent(telnet->frontend, logbuf); |
57356d63 |
422 | sfree(logbuf); |
51470298 |
423 | if (telnet->sb_opt == TELOPT_OLD_ENVIRON) { |
86916870 |
424 | if (telnet->cfg.rfc_environ) { |
374330e2 |
425 | value = RFC_VALUE; |
426 | var = RFC_VAR; |
427 | } else { |
428 | value = BSD_VALUE; |
429 | var = BSD_VAR; |
430 | } |
431 | /* |
432 | * Try to guess the sense of VAR and VALUE. |
433 | */ |
434 | while (p < q) { |
435 | if (*p == RFC_VAR) { |
436 | value = RFC_VALUE; |
437 | var = RFC_VAR; |
438 | } else if (*p == BSD_VAR) { |
439 | value = BSD_VALUE; |
440 | var = BSD_VAR; |
441 | } |
442 | p++; |
443 | } |
444 | } else { |
445 | /* |
446 | * With NEW_ENVIRON, the sense of VAR and VALUE |
447 | * isn't in doubt. |
448 | */ |
449 | value = RFC_VALUE; |
450 | var = RFC_VAR; |
451 | } |
32874aea |
452 | b[0] = IAC; |
453 | b[1] = SB; |
51470298 |
454 | b[2] = telnet->sb_opt; |
374330e2 |
455 | b[3] = TELQUAL_IS; |
456 | n = 4; |
86916870 |
457 | e = telnet->cfg.environmt; |
374330e2 |
458 | while (*e) { |
459 | b[n++] = var; |
32874aea |
460 | while (*e && *e != '\t') |
461 | b[n++] = *e++; |
462 | if (*e == '\t') |
463 | e++; |
374330e2 |
464 | b[n++] = value; |
32874aea |
465 | while (*e) |
466 | b[n++] = *e++; |
374330e2 |
467 | e++; |
468 | } |
86916870 |
469 | if (*telnet->cfg.username) { |
32874aea |
470 | b[n++] = var; |
471 | b[n++] = 'U'; |
472 | b[n++] = 'S'; |
473 | b[n++] = 'E'; |
474 | b[n++] = 'R'; |
475 | b[n++] = value; |
86916870 |
476 | e = telnet->cfg.username; |
32874aea |
477 | while (*e) |
478 | b[n++] = *e++; |
374330e2 |
479 | } |
32874aea |
480 | b[n++] = IAC; |
481 | b[n++] = SE; |
a1fd562d |
482 | telnet->bufsize = sk_write(telnet->s, (char *)b, n); |
afaa639b |
483 | logbuf = dupprintf("client:\tSB %s IS %s%s%s%s", |
484 | telopt(telnet->sb_opt), |
485 | *telnet->cfg.username ? "USER=" : "", |
486 | telnet->cfg.username, |
487 | *telnet->cfg.username ? " " : "", |
488 | n == 6 ? "<nothing>" : |
489 | (*telnet->cfg.environmt ? "<stuff>" : "")); |
a8327734 |
490 | logevent(telnet->frontend, logbuf); |
57356d63 |
491 | sfree(logbuf); |
374330e2 |
492 | } |
493 | break; |
494 | } |
495 | } |
496 | |
51470298 |
497 | static void do_telnet_read(Telnet telnet, char *buf, int len) |
32874aea |
498 | { |
ee00c99a |
499 | char *outbuf = NULL; |
500 | int outbuflen = 0, outbufsize = 0; |
501 | |
502 | #define ADDTOBUF(c) do { \ |
503 | if (outbuflen >= outbufsize) { \ |
504 | outbufsize = outbuflen + 256; \ |
505 | outbuf = sresize(outbuf, outbufsize, char); \ |
506 | } \ |
507 | outbuf[outbuflen++] = (c); \ |
508 | } while (0) |
374330e2 |
509 | |
510 | while (len--) { |
511 | int c = (unsigned char) *buf++; |
512 | |
51470298 |
513 | switch (telnet->state) { |
887035a5 |
514 | case TOP_LEVEL: |
374330e2 |
515 | case SEENCR: |
51470298 |
516 | if (c == NUL && telnet->state == SEENCR) |
517 | telnet->state = TOP_LEVEL; |
374330e2 |
518 | else if (c == IAC) |
51470298 |
519 | telnet->state = SEENIAC; |
374330e2 |
520 | else { |
51470298 |
521 | if (!telnet->in_synch) |
ee00c99a |
522 | ADDTOBUF(c); |
2f938b83 |
523 | |
524 | #if 1 |
525 | /* I can't get the F***ing winsock to insert the urgent IAC |
526 | * into the right position! Even with SO_OOBINLINE it gives |
527 | * it to recv too soon. And of course the DM byte (that |
528 | * arrives in the same packet!) appears several K later!! |
529 | * |
530 | * Oh well, we do get the DM in the right place so I'll |
531 | * just stop hiding on the next 0xf2 and hope for the best. |
532 | */ |
32874aea |
533 | else if (c == DM) |
51470298 |
534 | telnet->in_synch = 0; |
2f938b83 |
535 | #endif |
656fa244 |
536 | if (c == CR && telnet->opt_states[o_they_bin.index] != ACTIVE) |
51470298 |
537 | telnet->state = SEENCR; |
374330e2 |
538 | else |
51470298 |
539 | telnet->state = TOP_LEVEL; |
374330e2 |
540 | } |
541 | break; |
542 | case SEENIAC: |
32874aea |
543 | if (c == DO) |
51470298 |
544 | telnet->state = SEENDO; |
32874aea |
545 | else if (c == DONT) |
51470298 |
546 | telnet->state = SEENDONT; |
32874aea |
547 | else if (c == WILL) |
51470298 |
548 | telnet->state = SEENWILL; |
32874aea |
549 | else if (c == WONT) |
51470298 |
550 | telnet->state = SEENWONT; |
32874aea |
551 | else if (c == SB) |
51470298 |
552 | telnet->state = SEENSB; |
2f938b83 |
553 | else if (c == DM) { |
51470298 |
554 | telnet->in_synch = 0; |
555 | telnet->state = TOP_LEVEL; |
32874aea |
556 | } else { |
ded38628 |
557 | /* ignore everything else; print it if it's IAC */ |
558 | if (c == IAC) { |
ee00c99a |
559 | ADDTOBUF(c); |
ded38628 |
560 | } |
51470298 |
561 | telnet->state = TOP_LEVEL; |
300d41b0 |
562 | } |
374330e2 |
563 | break; |
564 | case SEENWILL: |
51470298 |
565 | proc_rec_opt(telnet, WILL, c); |
566 | telnet->state = TOP_LEVEL; |
374330e2 |
567 | break; |
568 | case SEENWONT: |
51470298 |
569 | proc_rec_opt(telnet, WONT, c); |
570 | telnet->state = TOP_LEVEL; |
374330e2 |
571 | break; |
572 | case SEENDO: |
51470298 |
573 | proc_rec_opt(telnet, DO, c); |
574 | telnet->state = TOP_LEVEL; |
374330e2 |
575 | break; |
576 | case SEENDONT: |
51470298 |
577 | proc_rec_opt(telnet, DONT, c); |
578 | telnet->state = TOP_LEVEL; |
374330e2 |
579 | break; |
580 | case SEENSB: |
51470298 |
581 | telnet->sb_opt = c; |
582 | telnet->sb_len = 0; |
583 | telnet->state = SUBNEGOT; |
374330e2 |
584 | break; |
585 | case SUBNEGOT: |
586 | if (c == IAC) |
51470298 |
587 | telnet->state = SUBNEG_IAC; |
374330e2 |
588 | else { |
32874aea |
589 | subneg_addchar: |
51470298 |
590 | if (telnet->sb_len >= telnet->sb_size) { |
51470298 |
591 | telnet->sb_size += SB_DELTA; |
3d88e64d |
592 | telnet->sb_buf = sresize(telnet->sb_buf, telnet->sb_size, |
593 | unsigned char); |
374330e2 |
594 | } |
3d88e64d |
595 | telnet->sb_buf[telnet->sb_len++] = c; |
51470298 |
596 | telnet->state = SUBNEGOT; /* in case we came here by goto */ |
374330e2 |
597 | } |
598 | break; |
599 | case SUBNEG_IAC: |
600 | if (c != SE) |
601 | goto subneg_addchar; /* yes, it's a hack, I know, but... */ |
602 | else { |
51470298 |
603 | process_subneg(telnet); |
604 | telnet->state = TOP_LEVEL; |
374330e2 |
605 | } |
606 | break; |
607 | } |
608 | } |
ee00c99a |
609 | |
610 | if (outbuflen) |
611 | c_write(telnet, outbuf, outbuflen); |
612 | sfree(outbuf); |
374330e2 |
613 | } |
614 | |
7555d6a5 |
615 | static void telnet_log(Plug plug, int type, SockAddr addr, int port, |
616 | const char *error_msg, int error_code) |
617 | { |
618 | Telnet telnet = (Telnet) plug; |
619 | char addrbuf[256], *msg; |
620 | |
621 | sk_getaddr(addr, addrbuf, lenof(addrbuf)); |
622 | |
623 | if (type == 0) |
624 | msg = dupprintf("Connecting to %s port %d", addrbuf, port); |
625 | else |
626 | msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); |
627 | |
628 | logevent(telnet->frontend, msg); |
629 | } |
630 | |
cbe2d68f |
631 | static int telnet_closing(Plug plug, const char *error_msg, int error_code, |
32874aea |
632 | int calling_back) |
633 | { |
51470298 |
634 | Telnet telnet = (Telnet) plug; |
635 | |
636 | if (telnet->s) { |
637 | sk_close(telnet->s); |
638 | telnet->s = NULL; |
39934deb |
639 | notify_remote_exit(telnet->frontend); |
f3ab576e |
640 | } |
7e78000d |
641 | if (error_msg) { |
a8327734 |
642 | logevent(telnet->frontend, error_msg); |
971bcc0a |
643 | connection_fatal(telnet->frontend, "%s", error_msg); |
7555d6a5 |
644 | } |
645 | /* Otherwise, the remote side closed the connection normally. */ |
7e78000d |
646 | return 0; |
647 | } |
648 | |
32874aea |
649 | static int telnet_receive(Plug plug, int urgent, char *data, int len) |
650 | { |
51470298 |
651 | Telnet telnet = (Telnet) plug; |
32874aea |
652 | if (urgent) |
51470298 |
653 | telnet->in_synch = TRUE; |
654 | do_telnet_read(telnet, data, len); |
8df7a775 |
655 | return 1; |
656 | } |
657 | |
3ad9d396 |
658 | static void telnet_sent(Plug plug, int bufsize) |
659 | { |
51470298 |
660 | Telnet telnet = (Telnet) plug; |
661 | telnet->bufsize = bufsize; |
3ad9d396 |
662 | } |
663 | |
374330e2 |
664 | /* |
8df7a775 |
665 | * Called to set up the Telnet connection. |
374330e2 |
666 | * |
667 | * Returns an error message, or NULL on success. |
668 | * |
6e1ebb76 |
669 | * Also places the canonical host name into `realhost'. It must be |
670 | * freed by the caller. |
374330e2 |
671 | */ |
cbe2d68f |
672 | static const char *telnet_init(void *frontend_handle, void **backend_handle, |
673 | Config *cfg, |
674 | char *host, int port, char **realhost, |
79bf227b |
675 | int nodelay, int keepalive) |
32874aea |
676 | { |
51470298 |
677 | static const struct plug_function_table fn_table = { |
7555d6a5 |
678 | telnet_log, |
7e78000d |
679 | telnet_closing, |
3ad9d396 |
680 | telnet_receive, |
681 | telnet_sent |
51470298 |
682 | }; |
8df7a775 |
683 | SockAddr addr; |
cbe2d68f |
684 | const char *err; |
51470298 |
685 | Telnet telnet; |
686 | |
3d88e64d |
687 | telnet = snew(struct telnet_tag); |
51470298 |
688 | telnet->fn = &fn_table; |
86916870 |
689 | telnet->cfg = *cfg; /* STRUCTURE COPY */ |
51470298 |
690 | telnet->s = NULL; |
691 | telnet->echoing = TRUE; |
692 | telnet->editing = TRUE; |
693 | telnet->activated = FALSE; |
694 | telnet->sb_buf = NULL; |
695 | telnet->sb_size = 0; |
696 | telnet->frontend = frontend_handle; |
86916870 |
697 | telnet->term_width = telnet->cfg.width; |
698 | telnet->term_height = telnet->cfg.height; |
51470298 |
699 | telnet->state = TOP_LEVEL; |
cc31ab78 |
700 | telnet->ldisc = NULL; |
39934deb |
701 | telnet->pinger = NULL; |
51470298 |
702 | *backend_handle = telnet; |
887035a5 |
703 | |
374330e2 |
704 | /* |
705 | * Try to find host. |
706 | */ |
3ad9d396 |
707 | { |
57356d63 |
708 | char *buf; |
05581745 |
709 | buf = dupprintf("Looking up host \"%s\"%s", host, |
710 | (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : |
711 | (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : |
712 | ""))); |
a8327734 |
713 | logevent(telnet->frontend, buf); |
57356d63 |
714 | sfree(buf); |
3ad9d396 |
715 | } |
05581745 |
716 | addr = name_lookup(host, port, realhost, &telnet->cfg, cfg->addressfamily); |
f85e6f6e |
717 | if ((err = sk_addr_error(addr)) != NULL) { |
718 | sk_addr_free(addr); |
8df7a775 |
719 | return err; |
f85e6f6e |
720 | } |
374330e2 |
721 | |
722 | if (port < 0) |
723 | port = 23; /* default telnet port */ |
724 | |
725 | /* |
726 | * Open socket. |
727 | */ |
51470298 |
728 | telnet->s = new_connection(addr, *realhost, port, 0, 1, |
79bf227b |
729 | nodelay, keepalive, (Plug) telnet, &telnet->cfg); |
a1fd562d |
730 | if ((err = sk_socket_error(telnet->s)) != NULL) |
8df7a775 |
731 | return err; |
374330e2 |
732 | |
39934deb |
733 | telnet->pinger = pinger_new(&telnet->cfg, &telnet_backend, telnet); |
734 | |
374330e2 |
735 | /* |
736 | * Initialise option states. |
737 | */ |
86916870 |
738 | if (telnet->cfg.passive_telnet) { |
51470298 |
739 | const struct Opt *const *o; |
8faa456c |
740 | |
741 | for (o = opts; *o; o++) |
51470298 |
742 | telnet->opt_states[(*o)->index] = INACTIVE; |
8faa456c |
743 | } else { |
51470298 |
744 | const struct Opt *const *o; |
374330e2 |
745 | |
51470298 |
746 | for (o = opts; *o; o++) { |
747 | telnet->opt_states[(*o)->index] = (*o)->initial_state; |
748 | if (telnet->opt_states[(*o)->index] == REQUESTED) |
749 | send_opt(telnet, (*o)->send, (*o)->option); |
750 | } |
751 | telnet->activated = TRUE; |
374330e2 |
752 | } |
753 | |
374330e2 |
754 | /* |
755 | * Set up SYNCH state. |
756 | */ |
51470298 |
757 | telnet->in_synch = FALSE; |
6f34e365 |
758 | |
533b1743 |
759 | /* |
760 | * We can send special commands from the start. |
761 | */ |
762 | update_specials_menu(telnet->frontend); |
763 | |
881da168 |
764 | /* |
765 | * loghost overrides realhost, if specified. |
766 | */ |
767 | if (*telnet->cfg.loghost) { |
768 | char *colon; |
769 | |
770 | sfree(*realhost); |
771 | *realhost = dupstr(telnet->cfg.loghost); |
772 | colon = strrchr(*realhost, ':'); |
773 | if (colon) { |
774 | /* |
775 | * FIXME: if we ever update this aspect of ssh.c for |
776 | * IPv6 literal management, this should change in line |
777 | * with it. |
778 | */ |
779 | *colon++ = '\0'; |
780 | } |
781 | } |
782 | |
374330e2 |
783 | return NULL; |
784 | } |
785 | |
fabd1805 |
786 | static void telnet_free(void *handle) |
787 | { |
788 | Telnet telnet = (Telnet) handle; |
789 | |
790 | sfree(telnet->sb_buf); |
791 | if (telnet->s) |
792 | sk_close(telnet->s); |
39934deb |
793 | if (telnet->pinger) |
794 | pinger_free(telnet->pinger); |
fabd1805 |
795 | sfree(telnet); |
796 | } |
374330e2 |
797 | /* |
86916870 |
798 | * Reconfigure the Telnet backend. There's no immediate action |
799 | * necessary, in this backend: we just save the fresh config for |
800 | * any subsequent negotiations. |
801 | */ |
802 | static void telnet_reconfig(void *handle, Config *cfg) |
803 | { |
804 | Telnet telnet = (Telnet) handle; |
39934deb |
805 | pinger_reconfig(telnet->pinger, &telnet->cfg, cfg); |
86916870 |
806 | telnet->cfg = *cfg; /* STRUCTURE COPY */ |
807 | } |
808 | |
809 | /* |
374330e2 |
810 | * Called to send data down the Telnet connection. |
811 | */ |
51470298 |
812 | static int telnet_send(void *handle, char *buf, int len) |
32874aea |
813 | { |
51470298 |
814 | Telnet telnet = (Telnet) handle; |
a1fd562d |
815 | unsigned char *p, *end; |
c85623f9 |
816 | static const unsigned char iac[2] = { IAC, IAC }; |
817 | static const unsigned char cr[2] = { CR, NUL }; |
a5f3e637 |
818 | #if 0 |
c85623f9 |
819 | static const unsigned char nl[2] = { CR, LF }; |
a5f3e637 |
820 | #endif |
374330e2 |
821 | |
51470298 |
822 | if (telnet->s == NULL) |
5471d09a |
823 | return 0; |
374330e2 |
824 | |
a1fd562d |
825 | p = (unsigned char *)buf; |
826 | end = (unsigned char *)(buf + len); |
827 | while (p < end) { |
828 | unsigned char *q = p; |
374330e2 |
829 | |
a1fd562d |
830 | while (p < end && iswritable(*p)) |
32874aea |
831 | p++; |
a1fd562d |
832 | telnet->bufsize = sk_write(telnet->s, (char *)q, p - q); |
374330e2 |
833 | |
a1fd562d |
834 | while (p < end && !iswritable(*p)) { |
51470298 |
835 | telnet->bufsize = |
a1fd562d |
836 | sk_write(telnet->s, (char *)(*p == IAC ? iac : cr), 2); |
374330e2 |
837 | p++; |
838 | } |
839 | } |
5471d09a |
840 | |
51470298 |
841 | return telnet->bufsize; |
5471d09a |
842 | } |
843 | |
844 | /* |
845 | * Called to query the current socket sendability status. |
846 | */ |
51470298 |
847 | static int telnet_sendbuffer(void *handle) |
5471d09a |
848 | { |
51470298 |
849 | Telnet telnet = (Telnet) handle; |
850 | return telnet->bufsize; |
374330e2 |
851 | } |
852 | |
853 | /* |
854 | * Called to set the size of the window from Telnet's POV. |
855 | */ |
51470298 |
856 | static void telnet_size(void *handle, int width, int height) |
32874aea |
857 | { |
51470298 |
858 | Telnet telnet = (Telnet) handle; |
ef41972c |
859 | unsigned char b[24]; |
860 | int n; |
57356d63 |
861 | char *logbuf; |
374330e2 |
862 | |
51470298 |
863 | telnet->term_width = width; |
864 | telnet->term_height = height; |
f278d6f8 |
865 | |
51470298 |
866 | if (telnet->s == NULL || telnet->opt_states[o_naws.index] != ACTIVE) |
374330e2 |
867 | return; |
ef41972c |
868 | n = 0; |
869 | b[n++] = IAC; |
870 | b[n++] = SB; |
871 | b[n++] = TELOPT_NAWS; |
872 | b[n++] = telnet->term_width >> 8; |
873 | if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */ |
874 | b[n++] = telnet->term_width & 0xFF; |
875 | if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */ |
876 | b[n++] = telnet->term_height >> 8; |
877 | if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */ |
878 | b[n++] = telnet->term_height & 0xFF; |
879 | if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */ |
880 | b[n++] = IAC; |
881 | b[n++] = SE; |
a1fd562d |
882 | telnet->bufsize = sk_write(telnet->s, (char *)b, n); |
57356d63 |
883 | logbuf = dupprintf("client:\tSB NAWS %d,%d", |
ef41972c |
884 | telnet->term_width, telnet->term_height); |
a8327734 |
885 | logevent(telnet->frontend, logbuf); |
57356d63 |
886 | sfree(logbuf); |
374330e2 |
887 | } |
888 | |
889 | /* |
890 | * Send Telnet special codes. |
891 | */ |
51470298 |
892 | static void telnet_special(void *handle, Telnet_Special code) |
32874aea |
893 | { |
51470298 |
894 | Telnet telnet = (Telnet) handle; |
374330e2 |
895 | unsigned char b[2]; |
896 | |
51470298 |
897 | if (telnet->s == NULL) |
374330e2 |
898 | return; |
899 | |
900 | b[0] = IAC; |
901 | switch (code) { |
32874aea |
902 | case TS_AYT: |
903 | b[1] = AYT; |
a1fd562d |
904 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
905 | break; |
906 | case TS_BRK: |
907 | b[1] = BREAK; |
a1fd562d |
908 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
909 | break; |
910 | case TS_EC: |
911 | b[1] = EC; |
a1fd562d |
912 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
913 | break; |
914 | case TS_EL: |
915 | b[1] = EL; |
a1fd562d |
916 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
917 | break; |
918 | case TS_GA: |
919 | b[1] = GA; |
a1fd562d |
920 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
921 | break; |
922 | case TS_NOP: |
923 | b[1] = NOP; |
a1fd562d |
924 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
925 | break; |
926 | case TS_ABORT: |
927 | b[1] = ABORT; |
a1fd562d |
928 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
929 | break; |
930 | case TS_AO: |
931 | b[1] = AO; |
a1fd562d |
932 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
933 | break; |
934 | case TS_IP: |
935 | b[1] = IP; |
a1fd562d |
936 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
937 | break; |
938 | case TS_SUSP: |
939 | b[1] = SUSP; |
a1fd562d |
940 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
941 | break; |
942 | case TS_EOR: |
943 | b[1] = EOR; |
a1fd562d |
944 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
945 | break; |
946 | case TS_EOF: |
947 | b[1] = xEOF; |
a1fd562d |
948 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
32874aea |
949 | break; |
a5f3e637 |
950 | case TS_EOL: |
6ee0cb6d |
951 | /* In BINARY mode, CR-LF becomes just CR - |
952 | * and without the NUL suffix too. */ |
656fa244 |
953 | if (telnet->opt_states[o_we_bin.index] == ACTIVE) |
6ee0cb6d |
954 | telnet->bufsize = sk_write(telnet->s, "\r", 1); |
656fa244 |
955 | else |
956 | telnet->bufsize = sk_write(telnet->s, "\r\n", 2); |
a5f3e637 |
957 | break; |
374330e2 |
958 | case TS_SYNCH: |
32874aea |
959 | b[1] = DM; |
a1fd562d |
960 | telnet->bufsize = sk_write(telnet->s, (char *)b, 1); |
961 | telnet->bufsize = sk_write_oob(telnet->s, (char *)(b + 1), 1); |
32874aea |
962 | break; |
684d367c |
963 | case TS_RECHO: |
51470298 |
964 | if (telnet->opt_states[o_echo.index] == INACTIVE || |
965 | telnet->opt_states[o_echo.index] == REALLY_INACTIVE) { |
966 | telnet->opt_states[o_echo.index] = REQUESTED; |
967 | send_opt(telnet, o_echo.send, o_echo.option); |
684d367c |
968 | } |
969 | break; |
970 | case TS_LECHO: |
51470298 |
971 | if (telnet->opt_states[o_echo.index] == ACTIVE) { |
972 | telnet->opt_states[o_echo.index] = REQUESTED; |
973 | send_opt(telnet, o_echo.nsend, o_echo.option); |
684d367c |
974 | } |
374330e2 |
975 | break; |
32874aea |
976 | case TS_PING: |
51470298 |
977 | if (telnet->opt_states[o_they_sga.index] == ACTIVE) { |
32874aea |
978 | b[1] = NOP; |
a1fd562d |
979 | telnet->bufsize = sk_write(telnet->s, (char *)b, 2); |
ec55b220 |
980 | } |
32874aea |
981 | break; |
6f2d0cde |
982 | default: |
983 | break; /* never heard of it */ |
374330e2 |
984 | } |
985 | } |
986 | |
125105d1 |
987 | static const struct telnet_special *telnet_get_specials(void *handle) |
988 | { |
989 | static const struct telnet_special specials[] = { |
990 | {"Are You There", TS_AYT}, |
991 | {"Break", TS_BRK}, |
992 | {"Synch", TS_SYNCH}, |
993 | {"Erase Character", TS_EC}, |
994 | {"Erase Line", TS_EL}, |
995 | {"Go Ahead", TS_GA}, |
996 | {"No Operation", TS_NOP}, |
6f2d0cde |
997 | {NULL, TS_SEP}, |
125105d1 |
998 | {"Abort Process", TS_ABORT}, |
999 | {"Abort Output", TS_AO}, |
1000 | {"Interrupt Process", TS_IP}, |
1001 | {"Suspend Process", TS_SUSP}, |
6f2d0cde |
1002 | {NULL, TS_SEP}, |
125105d1 |
1003 | {"End Of Record", TS_EOR}, |
1004 | {"End Of File", TS_EOF}, |
6f2d0cde |
1005 | {NULL, TS_EXITMENU} |
125105d1 |
1006 | }; |
1007 | return specials; |
1008 | } |
1009 | |
6226c939 |
1010 | static int telnet_connected(void *handle) |
32874aea |
1011 | { |
51470298 |
1012 | Telnet telnet = (Telnet) handle; |
6226c939 |
1013 | return telnet->s != NULL; |
32874aea |
1014 | } |
8ccc75b0 |
1015 | |
51470298 |
1016 | static int telnet_sendok(void *handle) |
32874aea |
1017 | { |
68a49acb |
1018 | /* Telnet telnet = (Telnet) handle; */ |
32874aea |
1019 | return 1; |
1020 | } |
4017be6d |
1021 | |
51470298 |
1022 | static void telnet_unthrottle(void *handle, int backlog) |
5471d09a |
1023 | { |
51470298 |
1024 | Telnet telnet = (Telnet) handle; |
1025 | sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG); |
5471d09a |
1026 | } |
1027 | |
51470298 |
1028 | static int telnet_ldisc(void *handle, int option) |
32874aea |
1029 | { |
51470298 |
1030 | Telnet telnet = (Telnet) handle; |
32874aea |
1031 | if (option == LD_ECHO) |
51470298 |
1032 | return telnet->echoing; |
32874aea |
1033 | if (option == LD_EDIT) |
51470298 |
1034 | return telnet->editing; |
0965bee0 |
1035 | return FALSE; |
1036 | } |
1037 | |
b9d7bcad |
1038 | static void telnet_provide_ldisc(void *handle, void *ldisc) |
1039 | { |
1040 | Telnet telnet = (Telnet) handle; |
1041 | telnet->ldisc = ldisc; |
1042 | } |
1043 | |
a8327734 |
1044 | static void telnet_provide_logctx(void *handle, void *logctx) |
1045 | { |
1046 | /* This is a stub. */ |
1047 | } |
1048 | |
51470298 |
1049 | static int telnet_exitcode(void *handle) |
d8d6c7e5 |
1050 | { |
0da1a790 |
1051 | Telnet telnet = (Telnet) handle; |
1052 | if (telnet->s != NULL) |
1053 | return -1; /* still connected */ |
1054 | else |
1055 | /* Telnet doesn't transmit exit codes back to the client */ |
1056 | return 0; |
d8d6c7e5 |
1057 | } |
1058 | |
f89c3294 |
1059 | /* |
1060 | * cfg_info for Telnet does nothing at all. |
1061 | */ |
1062 | static int telnet_cfg_info(void *handle) |
1063 | { |
1064 | return 0; |
1065 | } |
1066 | |
374330e2 |
1067 | Backend telnet_backend = { |
1068 | telnet_init, |
fabd1805 |
1069 | telnet_free, |
86916870 |
1070 | telnet_reconfig, |
374330e2 |
1071 | telnet_send, |
5471d09a |
1072 | telnet_sendbuffer, |
374330e2 |
1073 | telnet_size, |
4017be6d |
1074 | telnet_special, |
125105d1 |
1075 | telnet_get_specials, |
6226c939 |
1076 | telnet_connected, |
d8d6c7e5 |
1077 | telnet_exitcode, |
97db3be4 |
1078 | telnet_sendok, |
0965bee0 |
1079 | telnet_ldisc, |
b9d7bcad |
1080 | telnet_provide_ldisc, |
a8327734 |
1081 | telnet_provide_logctx, |
5471d09a |
1082 | telnet_unthrottle, |
f89c3294 |
1083 | telnet_cfg_info, |
9e164d82 |
1084 | "telnet", |
1085 | PROT_TELNET, |
97db3be4 |
1086 | 23 |
374330e2 |
1087 | }; |