4 #endif /* not macintosh */
10 static SOCKET s = INVALID_SOCKET;
12 #define IAC 255 /* interpret as command: */
13 #define DONT 254 /* you are not to use option */
14 #define DO 253 /* please, you use option */
15 #define WONT 252 /* I won't use option */
16 #define WILL 251 /* I will use option */
17 #define SB 250 /* interpret as subnegotiation */
18 #define SE 240 /* end sub negotiation */
20 #define GA 249 /* you may reverse the line */
21 #define EL 248 /* erase the current line */
22 #define EC 247 /* erase the current character */
23 #define AYT 246 /* are you there */
24 #define AO 245 /* abort output--but let prog finish */
25 #define IP 244 /* interrupt process--permanently */
26 #define BREAK 243 /* break */
27 #define DM 242 /* data mark--for connect. cleaning */
28 #define NOP 241 /* nop */
29 #define EOR 239 /* end of record (transparent mode) */
30 #define ABORT 238 /* Abort process */
31 #define SUSP 237 /* Suspend process */
32 #define xEOF 236 /* End of file: EOF is already used... */
34 #define TELOPT_BINARY 0 /* 8-bit data path */
35 #define TELOPT_ECHO 1 /* echo */
36 #define TELOPT_RCP 2 /* prepare to reconnect */
37 #define TELOPT_SGA 3 /* suppress go ahead */
38 #define TELOPT_NAMS 4 /* approximate message size */
39 #define TELOPT_STATUS 5 /* give status */
40 #define TELOPT_TM 6 /* timing mark */
41 #define TELOPT_RCTE 7 /* remote controlled transmission and echo */
42 #define TELOPT_NAOL 8 /* negotiate about output line width */
43 #define TELOPT_NAOP 9 /* negotiate about output page size */
44 #define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
45 #define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
46 #define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
47 #define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
48 #define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
49 #define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
50 #define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
51 #define TELOPT_XASCII 17 /* extended ascic character set */
52 #define TELOPT_LOGOUT 18 /* force logout */
53 #define TELOPT_BM 19 /* byte macro */
54 #define TELOPT_DET 20 /* data entry terminal */
55 #define TELOPT_SUPDUP 21 /* supdup protocol */
56 #define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
57 #define TELOPT_SNDLOC 23 /* send location */
58 #define TELOPT_TTYPE 24 /* terminal type */
59 #define TELOPT_EOR 25 /* end or record */
60 #define TELOPT_TUID 26 /* TACACS user identification */
61 #define TELOPT_OUTMRK 27 /* output marking */
62 #define TELOPT_TTYLOC 28 /* terminal location number */
63 #define TELOPT_3270REGIME 29 /* 3270 regime */
64 #define TELOPT_X3PAD 30 /* X.3 PAD */
65 #define TELOPT_NAWS 31 /* window size */
66 #define TELOPT_TSPEED 32 /* terminal speed */
67 #define TELOPT_LFLOW 33 /* remote flow control */
68 #define TELOPT_LINEMODE 34 /* Linemode option */
69 #define TELOPT_XDISPLOC 35 /* X Display Location */
70 #define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
71 #define TELOPT_AUTHENTICATION 37/* Authenticate */
72 #define TELOPT_ENCRYPT 38 /* Encryption option */
73 #define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
74 #define TELOPT_EXOPL 255 /* extended-options-list */
76 #define TELQUAL_IS 0 /* option is... */
77 #define TELQUAL_SEND 1 /* send option */
78 #define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
88 #define iswritable(x) ( (x) != IAC && (x) != CR )
90 static char *telopt(int opt) {
91 #define i(x) if (opt == TELOPT_ ## x) return #x;
92 i(BINARY); i(ECHO); i(RCP); i(SGA); i(NAMS); i(STATUS); i(TM); i(RCTE);
93 i(NAOL); i(NAOP); i(NAOCRD); i(NAOHTS); i(NAOHTD); i(NAOFFD); i(NAOVTS);
94 i(NAOVTD); i(NAOLFD); i(XASCII); i(LOGOUT); i(BM); i(DET); i(SUPDUP);
95 i(SUPDUPOUTPUT); i(SNDLOC); i(TTYPE); i(EOR); i(TUID); i(OUTMRK);
96 i(TTYLOC); i(X3PAD); i(NAWS); i(TSPEED); i(LFLOW); i(LINEMODE);
97 i(XDISPLOC); i(OLD_ENVIRON); i(AUTHENTICATION); i(ENCRYPT);
98 i(NEW_ENVIRON); i(EXOPL);
103 static void telnet_size(void);
106 int send; /* what we initially send */
107 int nsend; /* -ve send if requested to stop it */
108 int ack, nak; /* +ve and -ve acknowledgements */
109 int option; /* the option code */
111 REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE
115 static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED};
116 static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED};
117 static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED};
118 static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON,
120 static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON,
122 static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED};
123 static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED};
124 static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED};
126 static struct Opt *opts[] = {
127 &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo,
128 &o_we_sga, &o_they_sga, NULL
135 static int sb_opt, sb_len;
136 static char *sb_buf = NULL;
137 static int sb_size = 0;
138 #define SB_DELTA 1024
140 static void try_write (void) {
141 while (outbuf_head != outbuf_reap) {
142 int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
143 int len = end - outbuf_reap;
146 ret = send (s, outbuf+outbuf_reap, len, 0);
148 outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
154 static void s_write (void *buf, int len) {
155 unsigned char *p = buf;
157 int new_head = (outbuf_head + 1) & OUTBUF_MASK;
158 if (new_head != outbuf_reap) {
159 outbuf[outbuf_head] = *p++;
160 outbuf_head = new_head;
166 static void c_write (char *buf, int len) {
168 int new_head = (inbuf_head + 1) & INBUF_MASK;
169 int c = (unsigned char) *buf;
170 if (new_head != inbuf_reap) {
171 inbuf[inbuf_head] = *buf++;
172 inbuf_head = new_head;
177 static void log_option (char *sender, int cmd, int option) {
179 sprintf(buf, "%s:\t%s %s", sender,
180 (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :
181 cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"),
186 static void send_opt (int cmd, int option) {
189 b[0] = IAC; b[1] = cmd; b[2] = option;
191 log_option("client", cmd, option);
194 static void deactivate_option (struct Opt *o) {
195 if (o->state == REQUESTED || o->state == ACTIVE)
196 send_opt (o->nsend, o->option);
197 o->state = REALLY_INACTIVE;
200 static void activate_option (struct Opt *o) {
201 if (o->send == WILL && o->option == TELOPT_NAWS)
203 if (o->send == WILL &&
204 (o->option == TELOPT_NEW_ENVIRON ||
205 o->option == TELOPT_OLD_ENVIRON)) {
207 * We may only have one kind of ENVIRON going at a time.
208 * This is a hack, but who cares.
210 deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
214 static void refused_option (struct Opt *o) {
215 if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
216 o_oenv.state == INACTIVE) {
217 send_opt (WILL, TELOPT_OLD_ENVIRON);
218 o_oenv.state = REQUESTED;
222 static void proc_rec_opt (int cmd, int option) {
225 log_option ("server", cmd, option);
226 for (o = opts; *o; o++) {
227 if ((*o)->option == option && (*o)->ack == cmd) {
228 switch ((*o)->state) {
230 (*o)->state = ACTIVE;
231 activate_option (*o);
236 (*o)->state = ACTIVE;
237 send_opt ((*o)->send, option);
238 activate_option (*o);
240 case REALLY_INACTIVE:
241 send_opt ((*o)->nsend, option);
245 } else if ((*o)->option == option && (*o)->nak == cmd) {
246 switch ((*o)->state) {
248 (*o)->state = INACTIVE;
252 (*o)->state = INACTIVE;
253 send_opt ((*o)->nsend, option);
256 case REALLY_INACTIVE:
263 * If we reach here, the option was one we weren't prepared to
264 * cope with. So send a negative ack.
266 send_opt ((cmd == WILL ? DONT : WONT), option);
269 static void process_subneg (void) {
270 unsigned char b[2048], *p, *q;
276 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
277 char logbuf[sizeof(cfg.termspeed)+80];
278 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED;
280 strcpy(b+4, cfg.termspeed);
281 n = 4 + strlen(cfg.termspeed);
282 b[n] = IAC; b[n+1] = SE;
284 lognegot("server:\tSB TSPEED SEND");
285 sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed);
288 lognegot ("server:\tSB TSPEED <something weird>");
291 if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
292 char logbuf[sizeof(cfg.termtype)+80];
293 b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE;
295 for (n = 0; cfg.termtype[n]; n++)
296 b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ?
297 cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]);
298 b[n+4] = IAC; b[n+5] = SE;
301 lognegot("server:\tSB TTYPE SEND");
302 sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4);
305 lognegot("server:\tSB TTYPE <something weird>\r\n");
307 case TELOPT_OLD_ENVIRON:
308 case TELOPT_NEW_ENVIRON:
311 if (p < q && *p == TELQUAL_SEND) {
314 sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt));
316 if (sb_opt == TELOPT_OLD_ENVIRON) {
317 if (cfg.rfc_environ) {
325 * Try to guess the sense of VAR and VALUE.
331 } else if (*p == BSD_VAR) {
339 * With NEW_ENVIRON, the sense of VAR and VALUE
345 b[0] = IAC; b[1] = SB; b[2] = sb_opt;
351 while (*e && *e != '\t') b[n++] = *e++;
354 while (*e) b[n++] = *e++;
358 b[n++] = var; b[n++] = 'U'; b[n++] = 'S';
359 b[n++] = 'E'; b[n++] = 'R'; b[n++] = value;
361 while (*e) b[n++] = *e++;
363 b[n++] = IAC; b[n++] = SE;
365 sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt),
366 n==6 ? "<nothing>" : "<stuff>");
374 TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
375 SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
376 } telnet_state = TOPLEVEL;
378 static void do_telnet_read (char *buf, int len) {
382 int c = (unsigned char) *buf++;
384 switch (telnet_state) {
387 if (c == NUL && telnet_state == SEENCR)
388 telnet_state = TOPLEVEL;
390 telnet_state = SEENIAC;
398 telnet_state = SEENCR;
400 telnet_state = TOPLEVEL;
404 if (c == DO) telnet_state = SEENDO;
405 else if (c == DONT) telnet_state = SEENDONT;
406 else if (c == WILL) telnet_state = SEENWILL;
407 else if (c == WONT) telnet_state = SEENWONT;
408 else if (c == SB) telnet_state = SEENSB;
409 else telnet_state = TOPLEVEL;/* ignore _everything_ else! */
412 proc_rec_opt (WILL, c);
413 telnet_state = TOPLEVEL;
416 proc_rec_opt (WONT, c);
417 telnet_state = TOPLEVEL;
420 proc_rec_opt (DO, c);
421 telnet_state = TOPLEVEL;
424 proc_rec_opt (DONT, c);
425 telnet_state = TOPLEVEL;
430 telnet_state = SUBNEGOT;
434 telnet_state = SUBNEG_IAC;
437 if (sb_len >= sb_size) {
441 realloc(sb_buf, sb_size) :
448 if (sb_len < sb_size)
449 sb_buf[sb_len++] = c;
450 telnet_state = SUBNEGOT;/* in case we came here by goto */
455 goto subneg_addchar; /* yes, it's a hack, I know, but... */
458 telnet_state = TOPLEVEL;
466 * Called to set up the Telnet connection. Will arrange for
467 * WM_NETEVENT messages to be passed to the specified window, whose
468 * window procedure should then call telnet_msg().
470 * Returns an error message, or NULL on success.
472 * Also places the canonical host name into `realhost'.
474 static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) {
482 if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
483 if ( (h = gethostbyname(host)) == NULL)
484 switch (WSAGetLastError()) {
485 case WSAENETDOWN: return "Network is down";
486 case WSAHOST_NOT_FOUND: case WSANO_DATA:
487 return "Host does not exist";
488 case WSATRY_AGAIN: return "Host not found";
489 default: return "gethostbyname: unknown error";
491 memcpy (&a, h->h_addr, sizeof(a));
492 *realhost = h->h_name;
498 port = 23; /* default telnet port */
503 s = socket(AF_INET, SOCK_STREAM, 0);
504 if (s == INVALID_SOCKET)
505 switch (WSAGetLastError()) {
506 case WSAENETDOWN: return "Network is down";
507 case WSAEAFNOSUPPORT: return "TCP/IP support not present";
508 default: return "socket(): unknown error";
514 setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b));
519 * Bind to local address.
521 addr.sin_family = AF_INET;
522 addr.sin_addr.s_addr = htonl(INADDR_ANY);
523 addr.sin_port = htons(0);
524 if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
525 switch (WSAGetLastError()) {
526 case WSAENETDOWN: return "Network is down";
527 default: return "bind(): unknown error";
531 * Connect to remote address.
533 addr.sin_addr.s_addr = htonl(a);
534 addr.sin_port = htons((short)port);
535 if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
536 switch (WSAGetLastError()) {
537 case WSAENETDOWN: return "Network is down";
538 case WSAECONNREFUSED: return "Connection refused";
539 case WSAENETUNREACH: return "Network is unreachable";
540 case WSAEHOSTUNREACH: return "No route to host";
541 default: return "connect(): unknown error";
544 if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
545 FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
546 switch (WSAGetLastError()) {
547 case WSAENETDOWN: return "Network is down";
548 default: return "WSAAsyncSelect(): unknown error";
552 * Initialise option states.
557 for (o = opts; *o; o++)
558 if ((*o)->state == REQUESTED)
559 send_opt ((*o)->send, (*o)->option);
564 * Set up SYNCH state.
573 * Process a WM_NETEVENT message. Will return 0 if the connection
574 * has closed, or <0 for a socket error.
576 static int telnet_msg (WPARAM wParam, LPARAM lParam) {
580 if (s == INVALID_SOCKET) /* how the hell did we get here?! */
583 if (WSAGETSELECTERROR(lParam) != 0)
584 return -WSAGETSELECTERROR(lParam);
586 switch (WSAGETSELECTEVENT(lParam)) {
588 ret = recv(s, buf, sizeof(buf), 0);
589 if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
591 if (ret < 0) /* any _other_ error */
592 return -10000-WSAGetLastError();
595 return 0; /* can't happen, in theory */
600 if (ioctlsocket (s, SIOCATMARK, &i) < 0) {
601 return -20000-WSAGetLastError();
607 do_telnet_read (buf, ret);
611 ret = recv(s, buf, sizeof(buf), 0);
613 telnet_state = TOPLEVEL;
615 ret = recv(s, buf, 1, MSG_OOB);
617 do_telnet_read (buf, ret);
619 if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
620 return -30000-WSAGetLastError();
623 if (outbuf_head != outbuf_reap)
630 return 1; /* shouldn't happen, but WTF */
634 * Called to send data down the Telnet connection.
636 static void telnet_send (char *buf, int len) {
638 static unsigned char iac[2] = { IAC, IAC };
639 static unsigned char cr[2] = { CR, NUL };
641 if (s == INVALID_SOCKET)
645 while (p < buf+len) {
648 while (iswritable((unsigned char)*p) && p < buf+len) p++;
651 while (p < buf+len && !iswritable((unsigned char)*p)) {
652 s_write ((unsigned char)*p == IAC ? iac : cr, 2);
659 * Called to set the size of the window from Telnet's POV.
661 static void telnet_size(void) {
665 if (s == INVALID_SOCKET || o_naws.state != ACTIVE)
667 b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS;
668 b[3] = cols >> 8; b[4] = cols & 0xFF;
669 b[5] = rows >> 8; b[6] = rows & 0xFF;
670 b[7] = IAC; b[8] = SE;
672 sprintf(logbuf, "client:\tSB NAWS %d,%d",
673 ((unsigned char)b[3] << 8) + (unsigned char)b[4],
674 ((unsigned char)b[5] << 8) + (unsigned char)b[6]);
679 * Send Telnet special codes.
681 static void telnet_special (Telnet_Special code) {
684 if (s == INVALID_SOCKET)
689 case TS_AYT: b[1] = AYT; s_write (b, 2); break;
690 case TS_BRK: b[1] = BREAK; s_write (b, 2); break;
691 case TS_EC: b[1] = EC; s_write (b, 2); break;
692 case TS_EL: b[1] = EL; s_write (b, 2); break;
693 case TS_GA: b[1] = GA; s_write (b, 2); break;
694 case TS_NOP: b[1] = NOP; s_write (b, 2); break;
695 case TS_ABORT: b[1] = ABORT; s_write (b, 2); break;
696 case TS_AO: b[1] = AO; s_write (b, 2); break;
697 case TS_IP: b[1] = IP; s_write (b, 2); break;
698 case TS_SUSP: b[1] = SUSP; s_write (b, 2); break;
699 case TS_EOR: b[1] = EOR; s_write (b, 2); break;
700 case TS_EOF: b[1] = xEOF; s_write (b, 2); break;
702 outbuf_head = outbuf_reap = 0;
704 send (s, b, 1, MSG_OOB);
709 Backend telnet_backend = {