2 #else /* not macintosh */
5 #endif /* not macintosh */
13 #pragma segment Telnet
16 static SOCKET s = INVALID_SOCKET;
17 /* kludge till we decide where to put telnet state */
20 #define IAC 255 /* interpret as command: */
21 #define DONT 254 /* you are not to use option */
22 #define DO 253 /* please, you use option */
23 #define WONT 252 /* I won't use option */
24 #define WILL 251 /* I will use option */
25 #define SB 250 /* interpret as subnegotiation */
26 #define SE 240 /* end sub negotiation */
28 #define GA 249 /* you may reverse the line */
29 #define EL 248 /* erase the current line */
30 #define EC 247 /* erase the current character */
31 #define AYT 246 /* are you there */
32 #define AO 245 /* abort output--but let prog finish */
33 #define IP 244 /* interrupt process--permanently */
34 #define BREAK 243 /* break */
35 #define DM 242 /* data mark--for connect. cleaning */
36 #define NOP 241 /* nop */
37 #define EOR 239 /* end of record (transparent mode) */
38 #define ABORT 238 /* Abort process */
39 #define SUSP 237 /* Suspend process */
40 #define xEOF 236 /* End of file: EOF is already used... */
42 #define TELOPT_BINARY 0 /* 8-bit data path */
43 #define TELOPT_ECHO 1 /* echo */
44 #define TELOPT_RCP 2 /* prepare to reconnect */
45 #define TELOPT_SGA 3 /* suppress go ahead */
46 #define TELOPT_NAMS 4 /* approximate message size */
47 #define TELOPT_STATUS 5 /* give status */
48 #define TELOPT_TM 6 /* timing mark */
49 #define TELOPT_RCTE 7 /* remote controlled transmission and echo */
50 #define TELOPT_NAOL 8 /* negotiate about output line width */
51 #define TELOPT_NAOP 9 /* negotiate about output page size */
52 #define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
53 #define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
54 #define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
55 #define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
56 #define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
57 #define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
58 #define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
59 #define TELOPT_XASCII 17 /* extended ascic character set */
60 #define TELOPT_LOGOUT 18 /* force logout */
61 #define TELOPT_BM 19 /* byte macro */
62 #define TELOPT_DET 20 /* data entry terminal */
63 #define TELOPT_SUPDUP 21 /* supdup protocol */
64 #define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
65 #define TELOPT_SNDLOC 23 /* send location */
66 #define TELOPT_TTYPE 24 /* terminal type */
67 #define TELOPT_EOR 25 /* end or record */
68 #define TELOPT_TUID 26 /* TACACS user identification */
69 #define TELOPT_OUTMRK 27 /* output marking */
70 #define TELOPT_TTYLOC 28 /* terminal location number */
71 #define TELOPT_3270REGIME 29 /* 3270 regime */
72 #define TELOPT_X3PAD 30 /* X.3 PAD */
73 #define TELOPT_NAWS 31 /* window size */
74 #define TELOPT_TSPEED 32 /* terminal speed */
75 #define TELOPT_LFLOW 33 /* remote flow control */
76 #define TELOPT_LINEMODE 34 /* Linemode option */
77 #define TELOPT_XDISPLOC 35 /* X Display Location */
78 #define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
79 #define TELOPT_AUTHENTICATION 37/* Authenticate */
80 #define TELOPT_ENCRYPT 38 /* Encryption option */
81 #define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
82 #define TELOPT_EXOPL 255 /* extended-options-list */
84 #define TELQUAL_IS 0 /* option is... */
85 #define TELQUAL_SEND 1 /* send option */
86 #define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
96 #define iswritable(x) ( (x) != IAC && (x) != CR )
98 static char *telopt(int opt) {
99 #define i(x) if (opt == TELOPT_ ## x) return #x;
100 i(BINARY); i(ECHO); i(RCP); i(SGA); i(NAMS); i(STATUS); i(TM); i(RCTE);
101 i(NAOL); i(NAOP); i(NAOCRD); i(NAOHTS); i(NAOHTD); i(NAOFFD); i(NAOVTS);
102 i(NAOVTD); i(NAOLFD); i(XASCII); i(LOGOUT); i(BM); i(DET); i(SUPDUP);
103 i(SUPDUPOUTPUT); i(SNDLOC); i(TTYPE); i(EOR); i(TUID); i(OUTMRK);
104 i(TTYLOC); i(X3PAD); i(NAWS); i(TSPEED); i(LFLOW); i(LINEMODE);
105 i(XDISPLOC); i(OLD_ENVIRON); i(AUTHENTICATION); i(ENCRYPT);
106 i(NEW_ENVIRON); i(EXOPL);
111 static void telnet_size(Session *ignored);
114 int send; /* what we initially send */
115 int nsend; /* -ve send if requested to stop it */
116 int ack, nak; /* +ve and -ve acknowledgements */
117 int option; /* the option code */
119 REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE
123 static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED};
124 static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED};
125 static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED};
126 static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON,
128 static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON,
130 static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED};
131 static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED};
132 static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED};
134 static struct Opt *opts[] = {
135 &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo,
136 &o_we_sga, &o_they_sga, NULL
143 static int sb_opt, sb_len;
144 static unsigned char *sb_buf = NULL;
145 static int sb_size = 0;
146 #define SB_DELTA 1024
148 static void try_write (void) {
149 while (sess->outbuf_head != sess->outbuf_reap) {
150 int end = (sess->outbuf_reap < sess->outbuf_head ? sess->outbuf_head : OUTBUF_SIZE);
151 int len = end - sess->outbuf_reap;
154 ret = net_send (s, sess->outbuf+sess->outbuf_reap, len, 0);
156 sess->outbuf_reap = (sess->outbuf_reap + ret) & OUTBUF_MASK;
162 static void s_write (void *buf, int len) {
163 unsigned char *p = buf;
165 int new_head = (sess->outbuf_head + 1) & OUTBUF_MASK;
166 if (new_head != sess->outbuf_reap) {
167 sess->outbuf[sess->outbuf_head] = *p++;
168 sess->outbuf_head = new_head;
174 static void c_write (char *buf, int len) {
176 int new_head = (sess->inbuf_head + 1) & INBUF_MASK;
177 int c = (unsigned char) *buf;
178 if (new_head != sess->inbuf_reap) {
179 sess->inbuf[sess->inbuf_head] = *buf++;
180 sess->inbuf_head = new_head;
185 static void log_option (char *sender, int cmd, int option) {
187 sprintf(buf, "%s:\t%s %s", sender,
188 (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :
189 cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"),
194 static void send_opt (int cmd, int option) {
197 b[0] = IAC; b[1] = cmd; b[2] = option;
199 log_option("client", cmd, option);
202 static void deactivate_option (struct Opt *o) {
203 if (o->state == REQUESTED || o->state == ACTIVE)
204 send_opt (o->nsend, o->option);
205 o->state = REALLY_INACTIVE;
208 static void activate_option (struct Opt *o) {
209 if (o->send == WILL && o->option == TELOPT_NAWS)
211 if (o->send == WILL &&
212 (o->option == TELOPT_NEW_ENVIRON ||
213 o->option == TELOPT_OLD_ENVIRON)) {
215 * We may only have one kind of ENVIRON going at a time.
216 * This is a hack, but who cares.
218 deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
222 static void refused_option (struct Opt *o) {
223 if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
224 o_oenv.state == INACTIVE) {
225 send_opt (WILL, TELOPT_OLD_ENVIRON);
226 o_oenv.state = REQUESTED;
230 static void proc_rec_opt (int cmd, int option) {
233 log_option ("server", cmd, option);
234 for (o = opts; *o; o++) {
235 if ((*o)->option == option && (*o)->ack == cmd) {
236 switch ((*o)->state) {
238 (*o)->state = ACTIVE;
239 activate_option (*o);
244 (*o)->state = ACTIVE;
245 send_opt ((*o)->send, option);
246 activate_option (*o);
248 case REALLY_INACTIVE:
249 send_opt ((*o)->nsend, option);
253 } else if ((*o)->option == option && (*o)->nak == cmd) {
254 switch ((*o)->state) {
256 (*o)->state = INACTIVE;
260 (*o)->state = INACTIVE;
261 send_opt ((*o)->nsend, option);
264 case REALLY_INACTIVE:
271 * If we reach here, the option was one we weren't prepared to
272 * cope with. So send a negative ack.
274 send_opt ((cmd == WILL ? DONT : WONT), option);
277 static void process_subneg (void) {
278 unsigned char b[2048], *p, *q;
284 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
285 char logbuf[sizeof(sess->cfg.termspeed)+80];
286 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED;
288 strcpy((char *)b+4, sess->cfg.termspeed);
289 n = 4 + strlen(sess->cfg.termspeed);
290 b[n] = IAC; b[n+1] = SE;
292 lognegot("server:\tSB TSPEED SEND");
293 sprintf(logbuf, "client:\tSB TSPEED IS %s", sess->cfg.termspeed);
296 lognegot ("server:\tSB TSPEED <something weird>");
299 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
300 char logbuf[sizeof(sess->cfg.termtype)+80];
301 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE;
303 for (n = 0; sess->cfg.termtype[n]; n++)
304 b[n+4] = (sess->cfg.termtype[n] >= 'a' && sess->cfg.termtype[n] <= 'z' ?
305 sess->cfg.termtype[n] + 'A'-'a' : sess->cfg.termtype[n]);
306 b[n+4] = IAC; b[n+5] = SE;
309 lognegot("server:\tSB TTYPE SEND");
310 sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4);
313 lognegot("server:\tSB TTYPE <something weird>\r\n");
315 case TELOPT_OLD_ENVIRON:
316 case TELOPT_NEW_ENVIRON:
319 if (p < q && *p == TELQUAL_SEND) {
322 sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt));
324 if (sb_opt == TELOPT_OLD_ENVIRON) {
325 if (sess->cfg.rfc_environ) {
333 * Try to guess the sense of VAR and VALUE.
339 } else if (*p == BSD_VAR) {
347 * With NEW_ENVIRON, the sense of VAR and VALUE
353 b[0] = IAC; b[1] = SB; b[2] = sb_opt;
356 e = sess->cfg.environmt;
359 while (*e && *e != '\t') b[n++] = *e++;
362 while (*e) b[n++] = *e++;
365 if (*sess->cfg.username) {
366 b[n++] = var; b[n++] = 'U'; b[n++] = 'S';
367 b[n++] = 'E'; b[n++] = 'R'; b[n++] = value;
368 e = sess->cfg.username;
369 while (*e) b[n++] = *e++;
371 b[n++] = IAC; b[n++] = SE;
373 sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt),
374 n==6 ? "<nothing>" : "<stuff>");
382 TELNET_TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
383 SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
384 } telnet_state = TELNET_TOPLEVEL;
386 static void do_telnet_read (char *buf, int len) {
390 int c = (unsigned char) *buf++;
392 switch (telnet_state) {
393 case TELNET_TOPLEVEL:
395 if (c == NUL && telnet_state == SEENCR)
396 telnet_state = TELNET_TOPLEVEL;
398 telnet_state = SEENIAC;
404 c_write ((char *)b, 1);
406 telnet_state = SEENCR;
408 telnet_state = TELNET_TOPLEVEL;
412 if (c == DO) telnet_state = SEENDO;
413 else if (c == DONT) telnet_state = SEENDONT;
414 else if (c == WILL) telnet_state = SEENWILL;
415 else if (c == WONT) telnet_state = SEENWONT;
416 else if (c == SB) telnet_state = SEENSB;
417 else telnet_state = TELNET_TOPLEVEL;/* ignore _everything_ else! */
420 proc_rec_opt (WILL, c);
421 telnet_state = TELNET_TOPLEVEL;
424 proc_rec_opt (WONT, c);
425 telnet_state = TELNET_TOPLEVEL;
428 proc_rec_opt (DO, c);
429 telnet_state = TELNET_TOPLEVEL;
432 proc_rec_opt (DONT, c);
433 telnet_state = TELNET_TOPLEVEL;
438 telnet_state = SUBNEGOT;
442 telnet_state = SUBNEG_IAC;
445 if (sb_len >= sb_size) {
446 unsigned char *newbuf;
449 realloc(sb_buf, sb_size) :
456 if (sb_len < sb_size)
457 sb_buf[sb_len++] = c;
458 telnet_state = SUBNEGOT;/* in case we came here by goto */
463 goto subneg_addchar; /* yes, it's a hack, I know, but... */
466 telnet_state = TELNET_TOPLEVEL;
474 * Called to set up the Telnet connection. Will arrange for
475 * WM_NETEVENT messages to be passed to the specified window, whose
476 * window procedure should then call telnet_msg().
478 * Returns an error message, or NULL on success.
481 static char *telnet_init (Session *this_sess) {
484 s = net_open(sess, sess->cfg.host, sess->cfg.port);
489 static void telnet_opened(Session *sess) {
491 * Initialise option states.
496 for (o = opts; *o; o++)
497 if ((*o)->state == REQUESTED)
498 send_opt ((*o)->send, (*o)->option);
503 * Set up SYNCH state.
510 * Process a WM_NETEVENT message. Will return 0 if the connection
511 * has closed, or <0 for a socket error.
513 static int telnet_msg (Session *sess, SOCKET sock, Net_Event_Type ne) {
517 if (s == INVALID_SOCKET) /* how the hell did we get here?! */
525 ret = net_recv(s, buf, sizeof(buf), 0);
526 if (ret < 0) /* any _other_ error */
530 return 0; /* can't happen, in theory */
535 if (ioctlsocket (s, SIOCATMARK, &i) < 0) {
536 return -20000-WSAGetLastError();
542 do_telnet_read (buf, ret);
546 ret = net_recv(s, buf, sizeof(buf), 0);
548 telnet_state = TELNET_TOPLEVEL;
550 ret = net_recv(s, buf, 1, /*MSG_OOB*/ 0);
552 do_telnet_read (buf, ret);
561 fatalbox("Host not found");
563 fatalbox("Connection refused");
565 fatalbox("Unable to open connection");
567 fatalbox("Connection timed out");
569 fatalbox("Connection reset by peer");
571 fatalbox("Connection died");
573 return 1; /* shouldn't happen, but WTF */
577 * Called to send data down the Telnet connection.
579 static void telnet_send (Session *this_sess, char *buf, int len) {
581 static unsigned char iac[2] = { IAC, IAC };
582 static unsigned char cr[2] = { CR, NUL };
584 if (s == INVALID_SOCKET)
588 while (p < buf+len) {
591 while (iswritable((unsigned char)*p) && p < buf+len) p++;
594 while (p < buf+len && !iswritable((unsigned char)*p)) {
595 s_write ((unsigned char)*p == IAC ? iac : cr, 2);
602 * Called to set the size of the window from Telnet's POV.
604 static void telnet_size(Session *sess) {
608 if (s == INVALID_SOCKET || o_naws.state != ACTIVE)
610 b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS;
611 b[3] = sess->cols >> 8; b[4] = sess->cols & 0xFF;
612 b[5] = sess->rows >> 8; b[6] = sess->rows & 0xFF;
613 b[7] = IAC; b[8] = SE;
615 sprintf(logbuf, "client:\tSB NAWS %d,%d",
616 ((unsigned char)b[3] << 8) + (unsigned char)b[4],
617 ((unsigned char)b[5] << 8) + (unsigned char)b[6]);
622 * Send Telnet special codes.
624 static void telnet_special (Session *sess, Telnet_Special code) {
627 if (s == INVALID_SOCKET)
632 case TS_AYT: b[1] = AYT; s_write (b, 2); break;
633 case TS_BRK: b[1] = BREAK; s_write (b, 2); break;
634 case TS_EC: b[1] = EC; s_write (b, 2); break;
635 case TS_EL: b[1] = EL; s_write (b, 2); break;
636 case TS_GA: b[1] = GA; s_write (b, 2); break;
637 case TS_NOP: b[1] = NOP; s_write (b, 2); break;
638 case TS_ABORT: b[1] = ABORT; s_write (b, 2); break;
639 case TS_AO: b[1] = AO; s_write (b, 2); break;
640 case TS_IP: b[1] = IP; s_write (b, 2); break;
641 case TS_SUSP: b[1] = SUSP; s_write (b, 2); break;
642 case TS_EOR: b[1] = EOR; s_write (b, 2); break;
643 case TS_EOF: b[1] = xEOF; s_write (b, 2); break;
645 sess->outbuf_head = sess->outbuf_reap = 0;
647 net_send (s, b, 1, SEND_URG);
652 Backend telnet_backend = {