+++ /dev/null
-/*\r
- * Telnet backend.\r
- */\r
-\r
-#include <stdio.h>\r
-#include <stdlib.h>\r
-\r
-#include "putty.h"\r
-\r
-#ifndef FALSE\r
-#define FALSE 0\r
-#endif\r
-#ifndef TRUE\r
-#define TRUE 1\r
-#endif\r
-\r
-#define IAC 255 /* interpret as command: */\r
-#define DONT 254 /* you are not to use option */\r
-#define DO 253 /* please, you use option */\r
-#define WONT 252 /* I won't use option */\r
-#define WILL 251 /* I will use option */\r
-#define SB 250 /* interpret as subnegotiation */\r
-#define SE 240 /* end sub negotiation */\r
-\r
-#define GA 249 /* you may reverse the line */\r
-#define EL 248 /* erase the current line */\r
-#define EC 247 /* erase the current character */\r
-#define AYT 246 /* are you there */\r
-#define AO 245 /* abort output--but let prog finish */\r
-#define IP 244 /* interrupt process--permanently */\r
-#define BREAK 243 /* break */\r
-#define DM 242 /* data mark--for connect. cleaning */\r
-#define NOP 241 /* nop */\r
-#define EOR 239 /* end of record (transparent mode) */\r
-#define ABORT 238 /* Abort process */\r
-#define SUSP 237 /* Suspend process */\r
-#define xEOF 236 /* End of file: EOF is already used... */\r
-\r
-#define TELOPTS(X) \\r
- X(BINARY, 0) /* 8-bit data path */ \\r
- X(ECHO, 1) /* echo */ \\r
- X(RCP, 2) /* prepare to reconnect */ \\r
- X(SGA, 3) /* suppress go ahead */ \\r
- X(NAMS, 4) /* approximate message size */ \\r
- X(STATUS, 5) /* give status */ \\r
- X(TM, 6) /* timing mark */ \\r
- X(RCTE, 7) /* remote controlled transmission and echo */ \\r
- X(NAOL, 8) /* negotiate about output line width */ \\r
- X(NAOP, 9) /* negotiate about output page size */ \\r
- X(NAOCRD, 10) /* negotiate about CR disposition */ \\r
- X(NAOHTS, 11) /* negotiate about horizontal tabstops */ \\r
- X(NAOHTD, 12) /* negotiate about horizontal tab disposition */ \\r
- X(NAOFFD, 13) /* negotiate about formfeed disposition */ \\r
- X(NAOVTS, 14) /* negotiate about vertical tab stops */ \\r
- X(NAOVTD, 15) /* negotiate about vertical tab disposition */ \\r
- X(NAOLFD, 16) /* negotiate about output LF disposition */ \\r
- X(XASCII, 17) /* extended ascic character set */ \\r
- X(LOGOUT, 18) /* force logout */ \\r
- X(BM, 19) /* byte macro */ \\r
- X(DET, 20) /* data entry terminal */ \\r
- X(SUPDUP, 21) /* supdup protocol */ \\r
- X(SUPDUPOUTPUT, 22) /* supdup output */ \\r
- X(SNDLOC, 23) /* send location */ \\r
- X(TTYPE, 24) /* terminal type */ \\r
- X(EOR, 25) /* end or record */ \\r
- X(TUID, 26) /* TACACS user identification */ \\r
- X(OUTMRK, 27) /* output marking */ \\r
- X(TTYLOC, 28) /* terminal location number */ \\r
- X(3270REGIME, 29) /* 3270 regime */ \\r
- X(X3PAD, 30) /* X.3 PAD */ \\r
- X(NAWS, 31) /* window size */ \\r
- X(TSPEED, 32) /* terminal speed */ \\r
- X(LFLOW, 33) /* remote flow control */ \\r
- X(LINEMODE, 34) /* Linemode option */ \\r
- X(XDISPLOC, 35) /* X Display Location */ \\r
- X(OLD_ENVIRON, 36) /* Old - Environment variables */ \\r
- X(AUTHENTICATION, 37) /* Authenticate */ \\r
- X(ENCRYPT, 38) /* Encryption option */ \\r
- X(NEW_ENVIRON, 39) /* New - Environment variables */ \\r
- X(TN3270E, 40) /* TN3270 enhancements */ \\r
- X(XAUTH, 41) \\r
- X(CHARSET, 42) /* Character set */ \\r
- X(RSP, 43) /* Remote serial port */ \\r
- X(COM_PORT_OPTION, 44) /* Com port control */ \\r
- X(SLE, 45) /* Suppress local echo */ \\r
- X(STARTTLS, 46) /* Start TLS */ \\r
- X(KERMIT, 47) /* Automatic Kermit file transfer */ \\r
- X(SEND_URL, 48) \\r
- X(FORWARD_X, 49) \\r
- X(PRAGMA_LOGON, 138) \\r
- X(SSPI_LOGON, 139) \\r
- X(PRAGMA_HEARTBEAT, 140) \\r
- X(EXOPL, 255) /* extended-options-list */\r
-\r
-#define telnet_enum(x,y) TELOPT_##x = y,\r
-enum { TELOPTS(telnet_enum) dummy=0 };\r
-#undef telnet_enum\r
-\r
-#define TELQUAL_IS 0 /* option is... */\r
-#define TELQUAL_SEND 1 /* send option */\r
-#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */\r
-#define BSD_VAR 1\r
-#define BSD_VALUE 0\r
-#define RFC_VAR 0\r
-#define RFC_VALUE 1\r
-\r
-#define CR 13\r
-#define LF 10\r
-#define NUL 0\r
-\r
-#define iswritable(x) \\r
- ( (x) != IAC && \\r
- (telnet->opt_states[o_we_bin.index] == ACTIVE || (x) != CR))\r
-\r
-static char *telopt(int opt)\r
-{\r
-#define telnet_str(x,y) case TELOPT_##x: return #x;\r
- switch (opt) {\r
- TELOPTS(telnet_str)\r
- default:\r
- return "<unknown>";\r
- }\r
-#undef telnet_str\r
-}\r
-\r
-static void telnet_size(void *handle, int width, int height);\r
-\r
-struct Opt {\r
- int send; /* what we initially send */\r
- int nsend; /* -ve send if requested to stop it */\r
- int ack, nak; /* +ve and -ve acknowledgements */\r
- int option; /* the option code */\r
- int index; /* index into telnet->opt_states[] */\r
- enum {\r
- REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE\r
- } initial_state;\r
-};\r
-\r
-enum {\r
- OPTINDEX_NAWS,\r
- OPTINDEX_TSPEED,\r
- OPTINDEX_TTYPE,\r
- OPTINDEX_OENV,\r
- OPTINDEX_NENV,\r
- OPTINDEX_ECHO,\r
- OPTINDEX_WE_SGA,\r
- OPTINDEX_THEY_SGA,\r
- OPTINDEX_WE_BIN,\r
- OPTINDEX_THEY_BIN,\r
- NUM_OPTS\r
-};\r
-\r
-static const struct Opt o_naws =\r
- { WILL, WONT, DO, DONT, TELOPT_NAWS, OPTINDEX_NAWS, REQUESTED };\r
-static const struct Opt o_tspeed =\r
- { WILL, WONT, DO, DONT, TELOPT_TSPEED, OPTINDEX_TSPEED, REQUESTED };\r
-static const struct Opt o_ttype =\r
- { WILL, WONT, DO, DONT, TELOPT_TTYPE, OPTINDEX_TTYPE, REQUESTED };\r
-static const struct Opt o_oenv =\r
- { WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON, OPTINDEX_OENV, INACTIVE };\r
-static const struct Opt o_nenv =\r
- { WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON, OPTINDEX_NENV, REQUESTED };\r
-static const struct Opt o_echo =\r
- { DO, DONT, WILL, WONT, TELOPT_ECHO, OPTINDEX_ECHO, REQUESTED };\r
-static const struct Opt o_we_sga =\r
- { WILL, WONT, DO, DONT, TELOPT_SGA, OPTINDEX_WE_SGA, REQUESTED };\r
-static const struct Opt o_they_sga =\r
- { DO, DONT, WILL, WONT, TELOPT_SGA, OPTINDEX_THEY_SGA, REQUESTED };\r
-static const struct Opt o_we_bin =\r
- { WILL, WONT, DO, DONT, TELOPT_BINARY, OPTINDEX_WE_BIN, INACTIVE };\r
-static const struct Opt o_they_bin =\r
- { DO, DONT, WILL, WONT, TELOPT_BINARY, OPTINDEX_THEY_BIN, INACTIVE };\r
-\r
-static const struct Opt *const opts[] = {\r
- &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo,\r
- &o_we_sga, &o_they_sga, &o_we_bin, &o_they_bin, NULL\r
-};\r
-\r
-typedef struct telnet_tag {\r
- const struct plug_function_table *fn;\r
- /* the above field _must_ be first in the structure */\r
-\r
- Socket s;\r
-\r
- void *frontend;\r
- void *ldisc;\r
- int term_width, term_height;\r
-\r
- int opt_states[NUM_OPTS];\r
-\r
- int echoing, editing;\r
- int activated;\r
- int bufsize;\r
- int in_synch;\r
- int sb_opt, sb_len;\r
- unsigned char *sb_buf;\r
- int sb_size;\r
-\r
- enum {\r
- TOP_LEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,\r
- SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR\r
- } state;\r
-\r
- Config cfg;\r
-\r
- Pinger pinger;\r
-} *Telnet;\r
-\r
-#define TELNET_MAX_BACKLOG 4096\r
-\r
-#define SB_DELTA 1024\r
-\r
-static void c_write(Telnet telnet, char *buf, int len)\r
-{\r
- int backlog;\r
- backlog = from_backend(telnet->frontend, 0, buf, len);\r
- sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG);\r
-}\r
-\r
-static void log_option(Telnet telnet, char *sender, int cmd, int option)\r
-{\r
- char *buf;\r
- /*\r
- * The strange-looking "<?""?>" below is there to avoid a\r
- * trigraph - a double question mark followed by > maps to a\r
- * closing brace character!\r
- */\r
- buf = dupprintf("%s:\t%s %s", sender,\r
- (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :\r
- cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<?""?>"),\r
- telopt(option));\r
- logevent(telnet->frontend, buf);\r
- sfree(buf);\r
-}\r
-\r
-static void send_opt(Telnet telnet, int cmd, int option)\r
-{\r
- unsigned char b[3];\r
-\r
- b[0] = IAC;\r
- b[1] = cmd;\r
- b[2] = option;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 3);\r
- log_option(telnet, "client", cmd, option);\r
-}\r
-\r
-static void deactivate_option(Telnet telnet, const struct Opt *o)\r
-{\r
- if (telnet->opt_states[o->index] == REQUESTED ||\r
- telnet->opt_states[o->index] == ACTIVE)\r
- send_opt(telnet, o->nsend, o->option);\r
- telnet->opt_states[o->index] = REALLY_INACTIVE;\r
-}\r
-\r
-/*\r
- * Generate side effects of enabling or disabling an option.\r
- */\r
-static void option_side_effects(Telnet telnet, const struct Opt *o, int enabled)\r
-{\r
- if (o->option == TELOPT_ECHO && o->send == DO)\r
- telnet->echoing = !enabled;\r
- else if (o->option == TELOPT_SGA && o->send == DO)\r
- telnet->editing = !enabled;\r
- if (telnet->ldisc) /* cause ldisc to notice the change */\r
- ldisc_send(telnet->ldisc, NULL, 0, 0);\r
-\r
- /* Ensure we get the minimum options */\r
- if (!telnet->activated) {\r
- if (telnet->opt_states[o_echo.index] == INACTIVE) {\r
- telnet->opt_states[o_echo.index] = REQUESTED;\r
- send_opt(telnet, o_echo.send, o_echo.option);\r
- }\r
- if (telnet->opt_states[o_we_sga.index] == INACTIVE) {\r
- telnet->opt_states[o_we_sga.index] = REQUESTED;\r
- send_opt(telnet, o_we_sga.send, o_we_sga.option);\r
- }\r
- if (telnet->opt_states[o_they_sga.index] == INACTIVE) {\r
- telnet->opt_states[o_they_sga.index] = REQUESTED;\r
- send_opt(telnet, o_they_sga.send, o_they_sga.option);\r
- }\r
- telnet->activated = TRUE;\r
- }\r
-}\r
-\r
-static void activate_option(Telnet telnet, const struct Opt *o)\r
-{\r
- if (o->send == WILL && o->option == TELOPT_NAWS)\r
- telnet_size(telnet, telnet->term_width, telnet->term_height);\r
- if (o->send == WILL &&\r
- (o->option == TELOPT_NEW_ENVIRON ||\r
- o->option == TELOPT_OLD_ENVIRON)) {\r
- /*\r
- * We may only have one kind of ENVIRON going at a time.\r
- * This is a hack, but who cares.\r
- */\r
- deactivate_option(telnet, o->option ==\r
- TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);\r
- }\r
- option_side_effects(telnet, o, 1);\r
-}\r
-\r
-static void refused_option(Telnet telnet, const struct Opt *o)\r
-{\r
- if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&\r
- telnet->opt_states[o_oenv.index] == INACTIVE) {\r
- send_opt(telnet, WILL, TELOPT_OLD_ENVIRON);\r
- telnet->opt_states[o_oenv.index] = REQUESTED;\r
- }\r
- option_side_effects(telnet, o, 0);\r
-}\r
-\r
-static void proc_rec_opt(Telnet telnet, int cmd, int option)\r
-{\r
- const struct Opt *const *o;\r
-\r
- log_option(telnet, "server", cmd, option);\r
- for (o = opts; *o; o++) {\r
- if ((*o)->option == option && (*o)->ack == cmd) {\r
- switch (telnet->opt_states[(*o)->index]) {\r
- case REQUESTED:\r
- telnet->opt_states[(*o)->index] = ACTIVE;\r
- activate_option(telnet, *o);\r
- break;\r
- case ACTIVE:\r
- break;\r
- case INACTIVE:\r
- telnet->opt_states[(*o)->index] = ACTIVE;\r
- send_opt(telnet, (*o)->send, option);\r
- activate_option(telnet, *o);\r
- break;\r
- case REALLY_INACTIVE:\r
- send_opt(telnet, (*o)->nsend, option);\r
- break;\r
- }\r
- return;\r
- } else if ((*o)->option == option && (*o)->nak == cmd) {\r
- switch (telnet->opt_states[(*o)->index]) {\r
- case REQUESTED:\r
- telnet->opt_states[(*o)->index] = INACTIVE;\r
- refused_option(telnet, *o);\r
- break;\r
- case ACTIVE:\r
- telnet->opt_states[(*o)->index] = INACTIVE;\r
- send_opt(telnet, (*o)->nsend, option);\r
- option_side_effects(telnet, *o, 0);\r
- break;\r
- case INACTIVE:\r
- case REALLY_INACTIVE:\r
- break;\r
- }\r
- return;\r
- }\r
- }\r
- /*\r
- * If we reach here, the option was one we weren't prepared to\r
- * cope with. If the request was positive (WILL or DO), we send\r
- * a negative ack to indicate refusal. If the request was\r
- * negative (WONT / DONT), we must do nothing.\r
- */\r
- if (cmd == WILL || cmd == DO)\r
- send_opt(telnet, (cmd == WILL ? DONT : WONT), option);\r
-}\r
-\r
-static void process_subneg(Telnet telnet)\r
-{\r
- unsigned char b[2048], *p, *q;\r
- int var, value, n;\r
- char *e;\r
-\r
- switch (telnet->sb_opt) {\r
- case TELOPT_TSPEED:\r
- if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {\r
- char *logbuf;\r
- b[0] = IAC;\r
- b[1] = SB;\r
- b[2] = TELOPT_TSPEED;\r
- b[3] = TELQUAL_IS;\r
- strcpy((char *)(b + 4), telnet->cfg.termspeed);\r
- n = 4 + strlen(telnet->cfg.termspeed);\r
- b[n] = IAC;\r
- b[n + 1] = SE;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, n + 2);\r
- logevent(telnet->frontend, "server:\tSB TSPEED SEND");\r
- logbuf = dupprintf("client:\tSB TSPEED IS %s", telnet->cfg.termspeed);\r
- logevent(telnet->frontend, logbuf);\r
- sfree(logbuf);\r
- } else\r
- logevent(telnet->frontend, "server:\tSB TSPEED <something weird>");\r
- break;\r
- case TELOPT_TTYPE:\r
- if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {\r
- char *logbuf;\r
- b[0] = IAC;\r
- b[1] = SB;\r
- b[2] = TELOPT_TTYPE;\r
- b[3] = TELQUAL_IS;\r
- for (n = 0; telnet->cfg.termtype[n]; n++)\r
- b[n + 4] = (telnet->cfg.termtype[n] >= 'a'\r
- && telnet->cfg.termtype[n] <=\r
- 'z' ? telnet->cfg.termtype[n] + 'A' -\r
- 'a' : telnet->cfg.termtype[n]);\r
- b[n + 4] = IAC;\r
- b[n + 5] = SE;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, n + 6);\r
- b[n + 4] = 0;\r
- logevent(telnet->frontend, "server:\tSB TTYPE SEND");\r
- logbuf = dupprintf("client:\tSB TTYPE IS %s", b + 4);\r
- logevent(telnet->frontend, logbuf);\r
- sfree(logbuf);\r
- } else\r
- logevent(telnet->frontend, "server:\tSB TTYPE <something weird>\r\n");\r
- break;\r
- case TELOPT_OLD_ENVIRON:\r
- case TELOPT_NEW_ENVIRON:\r
- p = telnet->sb_buf;\r
- q = p + telnet->sb_len;\r
- if (p < q && *p == TELQUAL_SEND) {\r
- char *logbuf;\r
- p++;\r
- logbuf = dupprintf("server:\tSB %s SEND", telopt(telnet->sb_opt));\r
- logevent(telnet->frontend, logbuf);\r
- sfree(logbuf);\r
- if (telnet->sb_opt == TELOPT_OLD_ENVIRON) {\r
- if (telnet->cfg.rfc_environ) {\r
- value = RFC_VALUE;\r
- var = RFC_VAR;\r
- } else {\r
- value = BSD_VALUE;\r
- var = BSD_VAR;\r
- }\r
- /*\r
- * Try to guess the sense of VAR and VALUE.\r
- */\r
- while (p < q) {\r
- if (*p == RFC_VAR) {\r
- value = RFC_VALUE;\r
- var = RFC_VAR;\r
- } else if (*p == BSD_VAR) {\r
- value = BSD_VALUE;\r
- var = BSD_VAR;\r
- }\r
- p++;\r
- }\r
- } else {\r
- /*\r
- * With NEW_ENVIRON, the sense of VAR and VALUE\r
- * isn't in doubt.\r
- */\r
- value = RFC_VALUE;\r
- var = RFC_VAR;\r
- }\r
- b[0] = IAC;\r
- b[1] = SB;\r
- b[2] = telnet->sb_opt;\r
- b[3] = TELQUAL_IS;\r
- n = 4;\r
- e = telnet->cfg.environmt;\r
- while (*e) {\r
- b[n++] = var;\r
- while (*e && *e != '\t')\r
- b[n++] = *e++;\r
- if (*e == '\t')\r
- e++;\r
- b[n++] = value;\r
- while (*e)\r
- b[n++] = *e++;\r
- e++;\r
- }\r
- {\r
- char user[sizeof(telnet->cfg.username)];\r
- (void) get_remote_username(&telnet->cfg, user, sizeof(user));\r
- if (*user) {\r
- b[n++] = var;\r
- b[n++] = 'U';\r
- b[n++] = 'S';\r
- b[n++] = 'E';\r
- b[n++] = 'R';\r
- b[n++] = value;\r
- e = user;\r
- while (*e)\r
- b[n++] = *e++;\r
- }\r
- b[n++] = IAC;\r
- b[n++] = SE;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, n);\r
- logbuf = dupprintf("client:\tSB %s IS %s%s%s%s",\r
- telopt(telnet->sb_opt),\r
- *user ? "USER=" : "",\r
- user,\r
- *user ? " " : "",\r
- n == 6 ? "<nothing>" :\r
- (*telnet->cfg.environmt ? "<stuff>" : ""));\r
- logevent(telnet->frontend, logbuf);\r
- sfree(logbuf);\r
- }\r
- }\r
- break;\r
- }\r
-}\r
-\r
-static void do_telnet_read(Telnet telnet, char *buf, int len)\r
-{\r
- char *outbuf = NULL;\r
- int outbuflen = 0, outbufsize = 0;\r
-\r
-#define ADDTOBUF(c) do { \\r
- if (outbuflen >= outbufsize) { \\r
- outbufsize = outbuflen + 256; \\r
- outbuf = sresize(outbuf, outbufsize, char); \\r
- } \\r
- outbuf[outbuflen++] = (c); \\r
-} while (0)\r
-\r
- while (len--) {\r
- int c = (unsigned char) *buf++;\r
-\r
- switch (telnet->state) {\r
- case TOP_LEVEL:\r
- case SEENCR:\r
- if (c == NUL && telnet->state == SEENCR)\r
- telnet->state = TOP_LEVEL;\r
- else if (c == IAC)\r
- telnet->state = SEENIAC;\r
- else {\r
- if (!telnet->in_synch)\r
- ADDTOBUF(c);\r
-\r
-#if 1\r
- /* I can't get the F***ing winsock to insert the urgent IAC\r
- * into the right position! Even with SO_OOBINLINE it gives\r
- * it to recv too soon. And of course the DM byte (that\r
- * arrives in the same packet!) appears several K later!!\r
- *\r
- * Oh well, we do get the DM in the right place so I'll\r
- * just stop hiding on the next 0xf2 and hope for the best.\r
- */\r
- else if (c == DM)\r
- telnet->in_synch = 0;\r
-#endif\r
- if (c == CR && telnet->opt_states[o_they_bin.index] != ACTIVE)\r
- telnet->state = SEENCR;\r
- else\r
- telnet->state = TOP_LEVEL;\r
- }\r
- break;\r
- case SEENIAC:\r
- if (c == DO)\r
- telnet->state = SEENDO;\r
- else if (c == DONT)\r
- telnet->state = SEENDONT;\r
- else if (c == WILL)\r
- telnet->state = SEENWILL;\r
- else if (c == WONT)\r
- telnet->state = SEENWONT;\r
- else if (c == SB)\r
- telnet->state = SEENSB;\r
- else if (c == DM) {\r
- telnet->in_synch = 0;\r
- telnet->state = TOP_LEVEL;\r
- } else {\r
- /* ignore everything else; print it if it's IAC */\r
- if (c == IAC) {\r
- ADDTOBUF(c);\r
- }\r
- telnet->state = TOP_LEVEL;\r
- }\r
- break;\r
- case SEENWILL:\r
- proc_rec_opt(telnet, WILL, c);\r
- telnet->state = TOP_LEVEL;\r
- break;\r
- case SEENWONT:\r
- proc_rec_opt(telnet, WONT, c);\r
- telnet->state = TOP_LEVEL;\r
- break;\r
- case SEENDO:\r
- proc_rec_opt(telnet, DO, c);\r
- telnet->state = TOP_LEVEL;\r
- break;\r
- case SEENDONT:\r
- proc_rec_opt(telnet, DONT, c);\r
- telnet->state = TOP_LEVEL;\r
- break;\r
- case SEENSB:\r
- telnet->sb_opt = c;\r
- telnet->sb_len = 0;\r
- telnet->state = SUBNEGOT;\r
- break;\r
- case SUBNEGOT:\r
- if (c == IAC)\r
- telnet->state = SUBNEG_IAC;\r
- else {\r
- subneg_addchar:\r
- if (telnet->sb_len >= telnet->sb_size) {\r
- telnet->sb_size += SB_DELTA;\r
- telnet->sb_buf = sresize(telnet->sb_buf, telnet->sb_size,\r
- unsigned char);\r
- }\r
- telnet->sb_buf[telnet->sb_len++] = c;\r
- telnet->state = SUBNEGOT; /* in case we came here by goto */\r
- }\r
- break;\r
- case SUBNEG_IAC:\r
- if (c != SE)\r
- goto subneg_addchar; /* yes, it's a hack, I know, but... */\r
- else {\r
- process_subneg(telnet);\r
- telnet->state = TOP_LEVEL;\r
- }\r
- break;\r
- }\r
- }\r
-\r
- if (outbuflen)\r
- c_write(telnet, outbuf, outbuflen);\r
- sfree(outbuf);\r
-}\r
-\r
-static void telnet_log(Plug plug, int type, SockAddr addr, int port,\r
- const char *error_msg, int error_code)\r
-{\r
- Telnet telnet = (Telnet) plug;\r
- char addrbuf[256], *msg;\r
-\r
- sk_getaddr(addr, addrbuf, lenof(addrbuf));\r
-\r
- if (type == 0)\r
- msg = dupprintf("Connecting to %s port %d", addrbuf, port);\r
- else\r
- msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);\r
-\r
- logevent(telnet->frontend, msg);\r
-}\r
-\r
-static int telnet_closing(Plug plug, const char *error_msg, int error_code,\r
- int calling_back)\r
-{\r
- Telnet telnet = (Telnet) plug;\r
-\r
- if (telnet->s) {\r
- sk_close(telnet->s);\r
- telnet->s = NULL;\r
- notify_remote_exit(telnet->frontend);\r
- }\r
- if (error_msg) {\r
- logevent(telnet->frontend, error_msg);\r
- connection_fatal(telnet->frontend, "%s", error_msg);\r
- }\r
- /* Otherwise, the remote side closed the connection normally. */\r
- return 0;\r
-}\r
-\r
-static int telnet_receive(Plug plug, int urgent, char *data, int len)\r
-{\r
- Telnet telnet = (Telnet) plug;\r
- if (urgent)\r
- telnet->in_synch = TRUE;\r
- do_telnet_read(telnet, data, len);\r
- return 1;\r
-}\r
-\r
-static void telnet_sent(Plug plug, int bufsize)\r
-{\r
- Telnet telnet = (Telnet) plug;\r
- telnet->bufsize = bufsize;\r
-}\r
-\r
-/*\r
- * Called to set up the Telnet connection.\r
- *\r
- * Returns an error message, or NULL on success.\r
- *\r
- * Also places the canonical host name into `realhost'. It must be\r
- * freed by the caller.\r
- */\r
-static const char *telnet_init(void *frontend_handle, void **backend_handle,\r
- Config *cfg,\r
- char *host, int port, char **realhost,\r
- int nodelay, int keepalive)\r
-{\r
- static const struct plug_function_table fn_table = {\r
- telnet_log,\r
- telnet_closing,\r
- telnet_receive,\r
- telnet_sent\r
- };\r
- SockAddr addr;\r
- const char *err;\r
- Telnet telnet;\r
-\r
- telnet = snew(struct telnet_tag);\r
- telnet->fn = &fn_table;\r
- telnet->cfg = *cfg; /* STRUCTURE COPY */\r
- telnet->s = NULL;\r
- telnet->echoing = TRUE;\r
- telnet->editing = TRUE;\r
- telnet->activated = FALSE;\r
- telnet->sb_buf = NULL;\r
- telnet->sb_size = 0;\r
- telnet->frontend = frontend_handle;\r
- telnet->term_width = telnet->cfg.width;\r
- telnet->term_height = telnet->cfg.height;\r
- telnet->state = TOP_LEVEL;\r
- telnet->ldisc = NULL;\r
- telnet->pinger = NULL;\r
- *backend_handle = telnet;\r
-\r
- /*\r
- * Try to find host.\r
- */\r
- {\r
- char *buf;\r
- buf = dupprintf("Looking up host \"%s\"%s", host,\r
- (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :\r
- (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :\r
- "")));\r
- logevent(telnet->frontend, buf);\r
- sfree(buf);\r
- }\r
- addr = name_lookup(host, port, realhost, &telnet->cfg, cfg->addressfamily);\r
- if ((err = sk_addr_error(addr)) != NULL) {\r
- sk_addr_free(addr);\r
- return err;\r
- }\r
-\r
- if (port < 0)\r
- port = 23; /* default telnet port */\r
-\r
- /*\r
- * Open socket.\r
- */\r
- telnet->s = new_connection(addr, *realhost, port, 0, 1,\r
- nodelay, keepalive, (Plug) telnet, &telnet->cfg);\r
- if ((err = sk_socket_error(telnet->s)) != NULL)\r
- return err;\r
-\r
- telnet->pinger = pinger_new(&telnet->cfg, &telnet_backend, telnet);\r
-\r
- /*\r
- * Initialise option states.\r
- */\r
- if (telnet->cfg.passive_telnet) {\r
- const struct Opt *const *o;\r
-\r
- for (o = opts; *o; o++)\r
- telnet->opt_states[(*o)->index] = INACTIVE;\r
- } else {\r
- const struct Opt *const *o;\r
-\r
- for (o = opts; *o; o++) {\r
- telnet->opt_states[(*o)->index] = (*o)->initial_state;\r
- if (telnet->opt_states[(*o)->index] == REQUESTED)\r
- send_opt(telnet, (*o)->send, (*o)->option);\r
- }\r
- telnet->activated = TRUE;\r
- }\r
-\r
- /*\r
- * Set up SYNCH state.\r
- */\r
- telnet->in_synch = FALSE;\r
-\r
- /*\r
- * We can send special commands from the start.\r
- */\r
- update_specials_menu(telnet->frontend);\r
-\r
- /*\r
- * loghost overrides realhost, if specified.\r
- */\r
- if (*telnet->cfg.loghost) {\r
- char *colon;\r
-\r
- sfree(*realhost);\r
- *realhost = dupstr(telnet->cfg.loghost);\r
- colon = strrchr(*realhost, ':');\r
- if (colon) {\r
- /*\r
- * FIXME: if we ever update this aspect of ssh.c for\r
- * IPv6 literal management, this should change in line\r
- * with it.\r
- */\r
- *colon++ = '\0';\r
- }\r
- }\r
-\r
- return NULL;\r
-}\r
-\r
-static void telnet_free(void *handle)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
-\r
- sfree(telnet->sb_buf);\r
- if (telnet->s)\r
- sk_close(telnet->s);\r
- if (telnet->pinger)\r
- pinger_free(telnet->pinger);\r
- sfree(telnet);\r
-}\r
-/*\r
- * Reconfigure the Telnet backend. There's no immediate action\r
- * necessary, in this backend: we just save the fresh config for\r
- * any subsequent negotiations.\r
- */\r
-static void telnet_reconfig(void *handle, Config *cfg)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- pinger_reconfig(telnet->pinger, &telnet->cfg, cfg);\r
- telnet->cfg = *cfg; /* STRUCTURE COPY */\r
-}\r
-\r
-/*\r
- * Called to send data down the Telnet connection.\r
- */\r
-static int telnet_send(void *handle, char *buf, int len)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- unsigned char *p, *end;\r
- static const unsigned char iac[2] = { IAC, IAC };\r
- static const unsigned char cr[2] = { CR, NUL };\r
-#if 0\r
- static const unsigned char nl[2] = { CR, LF };\r
-#endif\r
-\r
- if (telnet->s == NULL)\r
- return 0;\r
-\r
- p = (unsigned char *)buf;\r
- end = (unsigned char *)(buf + len);\r
- while (p < end) {\r
- unsigned char *q = p;\r
-\r
- while (p < end && iswritable(*p))\r
- p++;\r
- telnet->bufsize = sk_write(telnet->s, (char *)q, p - q);\r
-\r
- while (p < end && !iswritable(*p)) {\r
- telnet->bufsize = \r
- sk_write(telnet->s, (char *)(*p == IAC ? iac : cr), 2);\r
- p++;\r
- }\r
- }\r
-\r
- return telnet->bufsize;\r
-}\r
-\r
-/*\r
- * Called to query the current socket sendability status.\r
- */\r
-static int telnet_sendbuffer(void *handle)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- return telnet->bufsize;\r
-}\r
-\r
-/*\r
- * Called to set the size of the window from Telnet's POV.\r
- */\r
-static void telnet_size(void *handle, int width, int height)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- unsigned char b[24];\r
- int n;\r
- char *logbuf;\r
-\r
- telnet->term_width = width;\r
- telnet->term_height = height;\r
-\r
- if (telnet->s == NULL || telnet->opt_states[o_naws.index] != ACTIVE)\r
- return;\r
- n = 0;\r
- b[n++] = IAC;\r
- b[n++] = SB;\r
- b[n++] = TELOPT_NAWS;\r
- b[n++] = telnet->term_width >> 8;\r
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */\r
- b[n++] = telnet->term_width & 0xFF;\r
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */\r
- b[n++] = telnet->term_height >> 8;\r
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */\r
- b[n++] = telnet->term_height & 0xFF;\r
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */\r
- b[n++] = IAC;\r
- b[n++] = SE;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, n);\r
- logbuf = dupprintf("client:\tSB NAWS %d,%d",\r
- telnet->term_width, telnet->term_height);\r
- logevent(telnet->frontend, logbuf);\r
- sfree(logbuf);\r
-}\r
-\r
-/*\r
- * Send Telnet special codes.\r
- */\r
-static void telnet_special(void *handle, Telnet_Special code)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- unsigned char b[2];\r
-\r
- if (telnet->s == NULL)\r
- return;\r
-\r
- b[0] = IAC;\r
- switch (code) {\r
- case TS_AYT:\r
- b[1] = AYT;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_BRK:\r
- b[1] = BREAK;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_EC:\r
- b[1] = EC;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_EL:\r
- b[1] = EL;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_GA:\r
- b[1] = GA;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_NOP:\r
- b[1] = NOP;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_ABORT:\r
- b[1] = ABORT;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_AO:\r
- b[1] = AO;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_IP:\r
- b[1] = IP;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_SUSP:\r
- b[1] = SUSP;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_EOR:\r
- b[1] = EOR;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_EOF:\r
- b[1] = xEOF;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- break;\r
- case TS_EOL:\r
- /* In BINARY mode, CR-LF becomes just CR -\r
- * and without the NUL suffix too. */\r
- if (telnet->opt_states[o_we_bin.index] == ACTIVE)\r
- telnet->bufsize = sk_write(telnet->s, "\r", 1);\r
- else\r
- telnet->bufsize = sk_write(telnet->s, "\r\n", 2);\r
- break;\r
- case TS_SYNCH:\r
- b[1] = DM;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 1);\r
- telnet->bufsize = sk_write_oob(telnet->s, (char *)(b + 1), 1);\r
- break;\r
- case TS_RECHO:\r
- if (telnet->opt_states[o_echo.index] == INACTIVE ||\r
- telnet->opt_states[o_echo.index] == REALLY_INACTIVE) {\r
- telnet->opt_states[o_echo.index] = REQUESTED;\r
- send_opt(telnet, o_echo.send, o_echo.option);\r
- }\r
- break;\r
- case TS_LECHO:\r
- if (telnet->opt_states[o_echo.index] == ACTIVE) {\r
- telnet->opt_states[o_echo.index] = REQUESTED;\r
- send_opt(telnet, o_echo.nsend, o_echo.option);\r
- }\r
- break;\r
- case TS_PING:\r
- if (telnet->opt_states[o_they_sga.index] == ACTIVE) {\r
- b[1] = NOP;\r
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);\r
- }\r
- break;\r
- default:\r
- break; /* never heard of it */\r
- }\r
-}\r
-\r
-static const struct telnet_special *telnet_get_specials(void *handle)\r
-{\r
- static const struct telnet_special specials[] = {\r
- {"Are You There", TS_AYT},\r
- {"Break", TS_BRK},\r
- {"Synch", TS_SYNCH},\r
- {"Erase Character", TS_EC},\r
- {"Erase Line", TS_EL},\r
- {"Go Ahead", TS_GA},\r
- {"No Operation", TS_NOP},\r
- {NULL, TS_SEP},\r
- {"Abort Process", TS_ABORT},\r
- {"Abort Output", TS_AO},\r
- {"Interrupt Process", TS_IP},\r
- {"Suspend Process", TS_SUSP},\r
- {NULL, TS_SEP},\r
- {"End Of Record", TS_EOR},\r
- {"End Of File", TS_EOF},\r
- {NULL, TS_EXITMENU}\r
- };\r
- return specials;\r
-}\r
-\r
-static int telnet_connected(void *handle)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- return telnet->s != NULL;\r
-}\r
-\r
-static int telnet_sendok(void *handle)\r
-{\r
- /* Telnet telnet = (Telnet) handle; */\r
- return 1;\r
-}\r
-\r
-static void telnet_unthrottle(void *handle, int backlog)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG);\r
-}\r
-\r
-static int telnet_ldisc(void *handle, int option)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- if (option == LD_ECHO)\r
- return telnet->echoing;\r
- if (option == LD_EDIT)\r
- return telnet->editing;\r
- return FALSE;\r
-}\r
-\r
-static void telnet_provide_ldisc(void *handle, void *ldisc)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- telnet->ldisc = ldisc;\r
-}\r
-\r
-static void telnet_provide_logctx(void *handle, void *logctx)\r
-{\r
- /* This is a stub. */\r
-}\r
-\r
-static int telnet_exitcode(void *handle)\r
-{\r
- Telnet telnet = (Telnet) handle;\r
- if (telnet->s != NULL)\r
- return -1; /* still connected */\r
- else\r
- /* Telnet doesn't transmit exit codes back to the client */\r
- return 0;\r
-}\r
-\r
-/*\r
- * cfg_info for Telnet does nothing at all.\r
- */\r
-static int telnet_cfg_info(void *handle)\r
-{\r
- return 0;\r
-}\r
-\r
-Backend telnet_backend = {\r
- telnet_init,\r
- telnet_free,\r
- telnet_reconfig,\r
- telnet_send,\r
- telnet_sendbuffer,\r
- telnet_size,\r
- telnet_special,\r
- telnet_get_specials,\r
- telnet_connected,\r
- telnet_exitcode,\r
- telnet_sendok,\r
- telnet_ldisc,\r
- telnet_provide_ldisc,\r
- telnet_provide_logctx,\r
- telnet_unthrottle,\r
- telnet_cfg_info,\r
- "telnet",\r
- PROT_TELNET,\r
- 23\r
-};\r
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