diff options
Diffstat (limited to 'tools/plink/telnet.c')
| -rw-r--r-- | tools/plink/telnet.c | 1091 |
1 files changed, 0 insertions, 1091 deletions
diff --git a/tools/plink/telnet.c b/tools/plink/telnet.c deleted file mode 100644 index 8fbe88679..000000000 --- a/tools/plink/telnet.c +++ /dev/null @@ -1,1091 +0,0 @@ -/*
- * Telnet backend.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "putty.h"
-
-#ifndef FALSE
-#define FALSE 0
-#endif
-#ifndef TRUE
-#define TRUE 1
-#endif
-
-#define IAC 255 /* interpret as command: */
-#define DONT 254 /* you are not to use option */
-#define DO 253 /* please, you use option */
-#define WONT 252 /* I won't use option */
-#define WILL 251 /* I will use option */
-#define SB 250 /* interpret as subnegotiation */
-#define SE 240 /* end sub negotiation */
-
-#define GA 249 /* you may reverse the line */
-#define EL 248 /* erase the current line */
-#define EC 247 /* erase the current character */
-#define AYT 246 /* are you there */
-#define AO 245 /* abort output--but let prog finish */
-#define IP 244 /* interrupt process--permanently */
-#define BREAK 243 /* break */
-#define DM 242 /* data mark--for connect. cleaning */
-#define NOP 241 /* nop */
-#define EOR 239 /* end of record (transparent mode) */
-#define ABORT 238 /* Abort process */
-#define SUSP 237 /* Suspend process */
-#define xEOF 236 /* End of file: EOF is already used... */
-
-#define TELOPTS(X) \
- X(BINARY, 0) /* 8-bit data path */ \
- X(ECHO, 1) /* echo */ \
- X(RCP, 2) /* prepare to reconnect */ \
- X(SGA, 3) /* suppress go ahead */ \
- X(NAMS, 4) /* approximate message size */ \
- X(STATUS, 5) /* give status */ \
- X(TM, 6) /* timing mark */ \
- X(RCTE, 7) /* remote controlled transmission and echo */ \
- X(NAOL, 8) /* negotiate about output line width */ \
- X(NAOP, 9) /* negotiate about output page size */ \
- X(NAOCRD, 10) /* negotiate about CR disposition */ \
- X(NAOHTS, 11) /* negotiate about horizontal tabstops */ \
- X(NAOHTD, 12) /* negotiate about horizontal tab disposition */ \
- X(NAOFFD, 13) /* negotiate about formfeed disposition */ \
- X(NAOVTS, 14) /* negotiate about vertical tab stops */ \
- X(NAOVTD, 15) /* negotiate about vertical tab disposition */ \
- X(NAOLFD, 16) /* negotiate about output LF disposition */ \
- X(XASCII, 17) /* extended ascic character set */ \
- X(LOGOUT, 18) /* force logout */ \
- X(BM, 19) /* byte macro */ \
- X(DET, 20) /* data entry terminal */ \
- X(SUPDUP, 21) /* supdup protocol */ \
- X(SUPDUPOUTPUT, 22) /* supdup output */ \
- X(SNDLOC, 23) /* send location */ \
- X(TTYPE, 24) /* terminal type */ \
- X(EOR, 25) /* end or record */ \
- X(TUID, 26) /* TACACS user identification */ \
- X(OUTMRK, 27) /* output marking */ \
- X(TTYLOC, 28) /* terminal location number */ \
- X(3270REGIME, 29) /* 3270 regime */ \
- X(X3PAD, 30) /* X.3 PAD */ \
- X(NAWS, 31) /* window size */ \
- X(TSPEED, 32) /* terminal speed */ \
- X(LFLOW, 33) /* remote flow control */ \
- X(LINEMODE, 34) /* Linemode option */ \
- X(XDISPLOC, 35) /* X Display Location */ \
- X(OLD_ENVIRON, 36) /* Old - Environment variables */ \
- X(AUTHENTICATION, 37) /* Authenticate */ \
- X(ENCRYPT, 38) /* Encryption option */ \
- X(NEW_ENVIRON, 39) /* New - Environment variables */ \
- X(TN3270E, 40) /* TN3270 enhancements */ \
- X(XAUTH, 41) \
- X(CHARSET, 42) /* Character set */ \
- X(RSP, 43) /* Remote serial port */ \
- X(COM_PORT_OPTION, 44) /* Com port control */ \
- X(SLE, 45) /* Suppress local echo */ \
- X(STARTTLS, 46) /* Start TLS */ \
- X(KERMIT, 47) /* Automatic Kermit file transfer */ \
- X(SEND_URL, 48) \
- X(FORWARD_X, 49) \
- X(PRAGMA_LOGON, 138) \
- X(SSPI_LOGON, 139) \
- X(PRAGMA_HEARTBEAT, 140) \
- X(EXOPL, 255) /* extended-options-list */
-
-#define telnet_enum(x,y) TELOPT_##x = y,
-enum { TELOPTS(telnet_enum) dummy=0 };
-#undef telnet_enum
-
-#define TELQUAL_IS 0 /* option is... */
-#define TELQUAL_SEND 1 /* send option */
-#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
-#define BSD_VAR 1
-#define BSD_VALUE 0
-#define RFC_VAR 0
-#define RFC_VALUE 1
-
-#define CR 13
-#define LF 10
-#define NUL 0
-
-#define iswritable(x) \
- ( (x) != IAC && \
- (telnet->opt_states[o_we_bin.index] == ACTIVE || (x) != CR))
-
-static char *telopt(int opt)
-{
-#define telnet_str(x,y) case TELOPT_##x: return #x;
- switch (opt) {
- TELOPTS(telnet_str)
- default:
- return "<unknown>";
- }
-#undef telnet_str
-}
-
-static void telnet_size(void *handle, int width, int height);
-
-struct Opt {
- int send; /* what we initially send */
- int nsend; /* -ve send if requested to stop it */
- int ack, nak; /* +ve and -ve acknowledgements */
- int option; /* the option code */
- int index; /* index into telnet->opt_states[] */
- enum {
- REQUESTED, ACTIVE, INACTIVE, REALLY_INACTIVE
- } initial_state;
-};
-
-enum {
- OPTINDEX_NAWS,
- OPTINDEX_TSPEED,
- OPTINDEX_TTYPE,
- OPTINDEX_OENV,
- OPTINDEX_NENV,
- OPTINDEX_ECHO,
- OPTINDEX_WE_SGA,
- OPTINDEX_THEY_SGA,
- OPTINDEX_WE_BIN,
- OPTINDEX_THEY_BIN,
- NUM_OPTS
-};
-
-static const struct Opt o_naws =
- { WILL, WONT, DO, DONT, TELOPT_NAWS, OPTINDEX_NAWS, REQUESTED };
-static const struct Opt o_tspeed =
- { WILL, WONT, DO, DONT, TELOPT_TSPEED, OPTINDEX_TSPEED, REQUESTED };
-static const struct Opt o_ttype =
- { WILL, WONT, DO, DONT, TELOPT_TTYPE, OPTINDEX_TTYPE, REQUESTED };
-static const struct Opt o_oenv =
- { WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON, OPTINDEX_OENV, INACTIVE };
-static const struct Opt o_nenv =
- { WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON, OPTINDEX_NENV, REQUESTED };
-static const struct Opt o_echo =
- { DO, DONT, WILL, WONT, TELOPT_ECHO, OPTINDEX_ECHO, REQUESTED };
-static const struct Opt o_we_sga =
- { WILL, WONT, DO, DONT, TELOPT_SGA, OPTINDEX_WE_SGA, REQUESTED };
-static const struct Opt o_they_sga =
- { DO, DONT, WILL, WONT, TELOPT_SGA, OPTINDEX_THEY_SGA, REQUESTED };
-static const struct Opt o_we_bin =
- { WILL, WONT, DO, DONT, TELOPT_BINARY, OPTINDEX_WE_BIN, INACTIVE };
-static const struct Opt o_they_bin =
- { DO, DONT, WILL, WONT, TELOPT_BINARY, OPTINDEX_THEY_BIN, INACTIVE };
-
-static const struct Opt *const opts[] = {
- &o_naws, &o_tspeed, &o_ttype, &o_oenv, &o_nenv, &o_echo,
- &o_we_sga, &o_they_sga, &o_we_bin, &o_they_bin, NULL
-};
-
-typedef struct telnet_tag {
- const struct plug_function_table *fn;
- /* the above field _must_ be first in the structure */
-
- Socket s;
-
- void *frontend;
- void *ldisc;
- int term_width, term_height;
-
- int opt_states[NUM_OPTS];
-
- int echoing, editing;
- int activated;
- int bufsize;
- int in_synch;
- int sb_opt, sb_len;
- unsigned char *sb_buf;
- int sb_size;
-
- enum {
- TOP_LEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
- SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
- } state;
-
- Config cfg;
-
- Pinger pinger;
-} *Telnet;
-
-#define TELNET_MAX_BACKLOG 4096
-
-#define SB_DELTA 1024
-
-static void c_write(Telnet telnet, char *buf, int len)
-{
- int backlog;
- backlog = from_backend(telnet->frontend, 0, buf, len);
- sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG);
-}
-
-static void log_option(Telnet telnet, char *sender, int cmd, int option)
-{
- char *buf;
- /*
- * The strange-looking "<?""?>" below is there to avoid a
- * trigraph - a double question mark followed by > maps to a
- * closing brace character!
- */
- buf = dupprintf("%s:\t%s %s", sender,
- (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :
- cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<?""?>"),
- telopt(option));
- logevent(telnet->frontend, buf);
- sfree(buf);
-}
-
-static void send_opt(Telnet telnet, int cmd, int option)
-{
- unsigned char b[3];
-
- b[0] = IAC;
- b[1] = cmd;
- b[2] = option;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 3);
- log_option(telnet, "client", cmd, option);
-}
-
-static void deactivate_option(Telnet telnet, const struct Opt *o)
-{
- if (telnet->opt_states[o->index] == REQUESTED ||
- telnet->opt_states[o->index] == ACTIVE)
- send_opt(telnet, o->nsend, o->option);
- telnet->opt_states[o->index] = REALLY_INACTIVE;
-}
-
-/*
- * Generate side effects of enabling or disabling an option.
- */
-static void option_side_effects(Telnet telnet, const struct Opt *o, int enabled)
-{
- if (o->option == TELOPT_ECHO && o->send == DO)
- telnet->echoing = !enabled;
- else if (o->option == TELOPT_SGA && o->send == DO)
- telnet->editing = !enabled;
- if (telnet->ldisc) /* cause ldisc to notice the change */
- ldisc_send(telnet->ldisc, NULL, 0, 0);
-
- /* Ensure we get the minimum options */
- if (!telnet->activated) {
- if (telnet->opt_states[o_echo.index] == INACTIVE) {
- telnet->opt_states[o_echo.index] = REQUESTED;
- send_opt(telnet, o_echo.send, o_echo.option);
- }
- if (telnet->opt_states[o_we_sga.index] == INACTIVE) {
- telnet->opt_states[o_we_sga.index] = REQUESTED;
- send_opt(telnet, o_we_sga.send, o_we_sga.option);
- }
- if (telnet->opt_states[o_they_sga.index] == INACTIVE) {
- telnet->opt_states[o_they_sga.index] = REQUESTED;
- send_opt(telnet, o_they_sga.send, o_they_sga.option);
- }
- telnet->activated = TRUE;
- }
-}
-
-static void activate_option(Telnet telnet, const struct Opt *o)
-{
- if (o->send == WILL && o->option == TELOPT_NAWS)
- telnet_size(telnet, telnet->term_width, telnet->term_height);
- if (o->send == WILL &&
- (o->option == TELOPT_NEW_ENVIRON ||
- o->option == TELOPT_OLD_ENVIRON)) {
- /*
- * We may only have one kind of ENVIRON going at a time.
- * This is a hack, but who cares.
- */
- deactivate_option(telnet, o->option ==
- TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
- }
- option_side_effects(telnet, o, 1);
-}
-
-static void refused_option(Telnet telnet, const struct Opt *o)
-{
- if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
- telnet->opt_states[o_oenv.index] == INACTIVE) {
- send_opt(telnet, WILL, TELOPT_OLD_ENVIRON);
- telnet->opt_states[o_oenv.index] = REQUESTED;
- }
- option_side_effects(telnet, o, 0);
-}
-
-static void proc_rec_opt(Telnet telnet, int cmd, int option)
-{
- const struct Opt *const *o;
-
- log_option(telnet, "server", cmd, option);
- for (o = opts; *o; o++) {
- if ((*o)->option == option && (*o)->ack == cmd) {
- switch (telnet->opt_states[(*o)->index]) {
- case REQUESTED:
- telnet->opt_states[(*o)->index] = ACTIVE;
- activate_option(telnet, *o);
- break;
- case ACTIVE:
- break;
- case INACTIVE:
- telnet->opt_states[(*o)->index] = ACTIVE;
- send_opt(telnet, (*o)->send, option);
- activate_option(telnet, *o);
- break;
- case REALLY_INACTIVE:
- send_opt(telnet, (*o)->nsend, option);
- break;
- }
- return;
- } else if ((*o)->option == option && (*o)->nak == cmd) {
- switch (telnet->opt_states[(*o)->index]) {
- case REQUESTED:
- telnet->opt_states[(*o)->index] = INACTIVE;
- refused_option(telnet, *o);
- break;
- case ACTIVE:
- telnet->opt_states[(*o)->index] = INACTIVE;
- send_opt(telnet, (*o)->nsend, option);
- option_side_effects(telnet, *o, 0);
- break;
- case INACTIVE:
- case REALLY_INACTIVE:
- break;
- }
- return;
- }
- }
- /*
- * If we reach here, the option was one we weren't prepared to
- * cope with. If the request was positive (WILL or DO), we send
- * a negative ack to indicate refusal. If the request was
- * negative (WONT / DONT), we must do nothing.
- */
- if (cmd == WILL || cmd == DO)
- send_opt(telnet, (cmd == WILL ? DONT : WONT), option);
-}
-
-static void process_subneg(Telnet telnet)
-{
- unsigned char b[2048], *p, *q;
- int var, value, n;
- char *e;
-
- switch (telnet->sb_opt) {
- case TELOPT_TSPEED:
- if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {
- char *logbuf;
- b[0] = IAC;
- b[1] = SB;
- b[2] = TELOPT_TSPEED;
- b[3] = TELQUAL_IS;
- strcpy((char *)(b + 4), telnet->cfg.termspeed);
- n = 4 + strlen(telnet->cfg.termspeed);
- b[n] = IAC;
- b[n + 1] = SE;
- telnet->bufsize = sk_write(telnet->s, (char *)b, n + 2);
- logevent(telnet->frontend, "server:\tSB TSPEED SEND");
- logbuf = dupprintf("client:\tSB TSPEED IS %s", telnet->cfg.termspeed);
- logevent(telnet->frontend, logbuf);
- sfree(logbuf);
- } else
- logevent(telnet->frontend, "server:\tSB TSPEED <something weird>");
- break;
- case TELOPT_TTYPE:
- if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {
- char *logbuf;
- b[0] = IAC;
- b[1] = SB;
- b[2] = TELOPT_TTYPE;
- b[3] = TELQUAL_IS;
- for (n = 0; telnet->cfg.termtype[n]; n++)
- b[n + 4] = (telnet->cfg.termtype[n] >= 'a'
- && telnet->cfg.termtype[n] <=
- 'z' ? telnet->cfg.termtype[n] + 'A' -
- 'a' : telnet->cfg.termtype[n]);
- b[n + 4] = IAC;
- b[n + 5] = SE;
- telnet->bufsize = sk_write(telnet->s, (char *)b, n + 6);
- b[n + 4] = 0;
- logevent(telnet->frontend, "server:\tSB TTYPE SEND");
- logbuf = dupprintf("client:\tSB TTYPE IS %s", b + 4);
- logevent(telnet->frontend, logbuf);
- sfree(logbuf);
- } else
- logevent(telnet->frontend, "server:\tSB TTYPE <something weird>\r\n");
- break;
- case TELOPT_OLD_ENVIRON:
- case TELOPT_NEW_ENVIRON:
- p = telnet->sb_buf;
- q = p + telnet->sb_len;
- if (p < q && *p == TELQUAL_SEND) {
- char *logbuf;
- p++;
- logbuf = dupprintf("server:\tSB %s SEND", telopt(telnet->sb_opt));
- logevent(telnet->frontend, logbuf);
- sfree(logbuf);
- if (telnet->sb_opt == TELOPT_OLD_ENVIRON) {
- if (telnet->cfg.rfc_environ) {
- value = RFC_VALUE;
- var = RFC_VAR;
- } else {
- value = BSD_VALUE;
- var = BSD_VAR;
- }
- /*
- * Try to guess the sense of VAR and VALUE.
- */
- while (p < q) {
- if (*p == RFC_VAR) {
- value = RFC_VALUE;
- var = RFC_VAR;
- } else if (*p == BSD_VAR) {
- value = BSD_VALUE;
- var = BSD_VAR;
- }
- p++;
- }
- } else {
- /*
- * With NEW_ENVIRON, the sense of VAR and VALUE
- * isn't in doubt.
- */
- value = RFC_VALUE;
- var = RFC_VAR;
- }
- b[0] = IAC;
- b[1] = SB;
- b[2] = telnet->sb_opt;
- b[3] = TELQUAL_IS;
- n = 4;
- e = telnet->cfg.environmt;
- while (*e) {
- b[n++] = var;
- while (*e && *e != '\t')
- b[n++] = *e++;
- if (*e == '\t')
- e++;
- b[n++] = value;
- while (*e)
- b[n++] = *e++;
- e++;
- }
- {
- char user[sizeof(telnet->cfg.username)];
- (void) get_remote_username(&telnet->cfg, user, sizeof(user));
- if (*user) {
- b[n++] = var;
- b[n++] = 'U';
- b[n++] = 'S';
- b[n++] = 'E';
- b[n++] = 'R';
- b[n++] = value;
- e = user;
- while (*e)
- b[n++] = *e++;
- }
- b[n++] = IAC;
- b[n++] = SE;
- telnet->bufsize = sk_write(telnet->s, (char *)b, n);
- logbuf = dupprintf("client:\tSB %s IS %s%s%s%s",
- telopt(telnet->sb_opt),
- *user ? "USER=" : "",
- user,
- *user ? " " : "",
- n == 6 ? "<nothing>" :
- (*telnet->cfg.environmt ? "<stuff>" : ""));
- logevent(telnet->frontend, logbuf);
- sfree(logbuf);
- }
- }
- break;
- }
-}
-
-static void do_telnet_read(Telnet telnet, char *buf, int len)
-{
- char *outbuf = NULL;
- int outbuflen = 0, outbufsize = 0;
-
-#define ADDTOBUF(c) do { \
- if (outbuflen >= outbufsize) { \
- outbufsize = outbuflen + 256; \
- outbuf = sresize(outbuf, outbufsize, char); \
- } \
- outbuf[outbuflen++] = (c); \
-} while (0)
-
- while (len--) {
- int c = (unsigned char) *buf++;
-
- switch (telnet->state) {
- case TOP_LEVEL:
- case SEENCR:
- if (c == NUL && telnet->state == SEENCR)
- telnet->state = TOP_LEVEL;
- else if (c == IAC)
- telnet->state = SEENIAC;
- else {
- if (!telnet->in_synch)
- ADDTOBUF(c);
-
-#if 1
- /* I can't get the F***ing winsock to insert the urgent IAC
- * into the right position! Even with SO_OOBINLINE it gives
- * it to recv too soon. And of course the DM byte (that
- * arrives in the same packet!) appears several K later!!
- *
- * Oh well, we do get the DM in the right place so I'll
- * just stop hiding on the next 0xf2 and hope for the best.
- */
- else if (c == DM)
- telnet->in_synch = 0;
-#endif
- if (c == CR && telnet->opt_states[o_they_bin.index] != ACTIVE)
- telnet->state = SEENCR;
- else
- telnet->state = TOP_LEVEL;
- }
- break;
- case SEENIAC:
- if (c == DO)
- telnet->state = SEENDO;
- else if (c == DONT)
- telnet->state = SEENDONT;
- else if (c == WILL)
- telnet->state = SEENWILL;
- else if (c == WONT)
- telnet->state = SEENWONT;
- else if (c == SB)
- telnet->state = SEENSB;
- else if (c == DM) {
- telnet->in_synch = 0;
- telnet->state = TOP_LEVEL;
- } else {
- /* ignore everything else; print it if it's IAC */
- if (c == IAC) {
- ADDTOBUF(c);
- }
- telnet->state = TOP_LEVEL;
- }
- break;
- case SEENWILL:
- proc_rec_opt(telnet, WILL, c);
- telnet->state = TOP_LEVEL;
- break;
- case SEENWONT:
- proc_rec_opt(telnet, WONT, c);
- telnet->state = TOP_LEVEL;
- break;
- case SEENDO:
- proc_rec_opt(telnet, DO, c);
- telnet->state = TOP_LEVEL;
- break;
- case SEENDONT:
- proc_rec_opt(telnet, DONT, c);
- telnet->state = TOP_LEVEL;
- break;
- case SEENSB:
- telnet->sb_opt = c;
- telnet->sb_len = 0;
- telnet->state = SUBNEGOT;
- break;
- case SUBNEGOT:
- if (c == IAC)
- telnet->state = SUBNEG_IAC;
- else {
- subneg_addchar:
- if (telnet->sb_len >= telnet->sb_size) {
- telnet->sb_size += SB_DELTA;
- telnet->sb_buf = sresize(telnet->sb_buf, telnet->sb_size,
- unsigned char);
- }
- telnet->sb_buf[telnet->sb_len++] = c;
- telnet->state = SUBNEGOT; /* in case we came here by goto */
- }
- break;
- case SUBNEG_IAC:
- if (c != SE)
- goto subneg_addchar; /* yes, it's a hack, I know, but... */
- else {
- process_subneg(telnet);
- telnet->state = TOP_LEVEL;
- }
- break;
- }
- }
-
- if (outbuflen)
- c_write(telnet, outbuf, outbuflen);
- sfree(outbuf);
-}
-
-static void telnet_log(Plug plug, int type, SockAddr addr, int port,
- const char *error_msg, int error_code)
-{
- Telnet telnet = (Telnet) plug;
- char addrbuf[256], *msg;
-
- sk_getaddr(addr, addrbuf, lenof(addrbuf));
-
- if (type == 0)
- msg = dupprintf("Connecting to %s port %d", addrbuf, port);
- else
- msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg);
-
- logevent(telnet->frontend, msg);
-}
-
-static int telnet_closing(Plug plug, const char *error_msg, int error_code,
- int calling_back)
-{
- Telnet telnet = (Telnet) plug;
-
- if (telnet->s) {
- sk_close(telnet->s);
- telnet->s = NULL;
- notify_remote_exit(telnet->frontend);
- }
- if (error_msg) {
- logevent(telnet->frontend, error_msg);
- connection_fatal(telnet->frontend, "%s", error_msg);
- }
- /* Otherwise, the remote side closed the connection normally. */
- return 0;
-}
-
-static int telnet_receive(Plug plug, int urgent, char *data, int len)
-{
- Telnet telnet = (Telnet) plug;
- if (urgent)
- telnet->in_synch = TRUE;
- do_telnet_read(telnet, data, len);
- return 1;
-}
-
-static void telnet_sent(Plug plug, int bufsize)
-{
- Telnet telnet = (Telnet) plug;
- telnet->bufsize = bufsize;
-}
-
-/*
- * Called to set up the Telnet connection.
- *
- * Returns an error message, or NULL on success.
- *
- * Also places the canonical host name into `realhost'. It must be
- * freed by the caller.
- */
-static const char *telnet_init(void *frontend_handle, void **backend_handle,
- Config *cfg,
- char *host, int port, char **realhost,
- int nodelay, int keepalive)
-{
- static const struct plug_function_table fn_table = {
- telnet_log,
- telnet_closing,
- telnet_receive,
- telnet_sent
- };
- SockAddr addr;
- const char *err;
- Telnet telnet;
-
- telnet = snew(struct telnet_tag);
- telnet->fn = &fn_table;
- telnet->cfg = *cfg; /* STRUCTURE COPY */
- telnet->s = NULL;
- telnet->echoing = TRUE;
- telnet->editing = TRUE;
- telnet->activated = FALSE;
- telnet->sb_buf = NULL;
- telnet->sb_size = 0;
- telnet->frontend = frontend_handle;
- telnet->term_width = telnet->cfg.width;
- telnet->term_height = telnet->cfg.height;
- telnet->state = TOP_LEVEL;
- telnet->ldisc = NULL;
- telnet->pinger = NULL;
- *backend_handle = telnet;
-
- /*
- * Try to find host.
- */
- {
- char *buf;
- buf = dupprintf("Looking up host \"%s\"%s", host,
- (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
- (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
- "")));
- logevent(telnet->frontend, buf);
- sfree(buf);
- }
- addr = name_lookup(host, port, realhost, &telnet->cfg, cfg->addressfamily);
- if ((err = sk_addr_error(addr)) != NULL) {
- sk_addr_free(addr);
- return err;
- }
-
- if (port < 0)
- port = 23; /* default telnet port */
-
- /*
- * Open socket.
- */
- telnet->s = new_connection(addr, *realhost, port, 0, 1,
- nodelay, keepalive, (Plug) telnet, &telnet->cfg);
- if ((err = sk_socket_error(telnet->s)) != NULL)
- return err;
-
- telnet->pinger = pinger_new(&telnet->cfg, &telnet_backend, telnet);
-
- /*
- * Initialise option states.
- */
- if (telnet->cfg.passive_telnet) {
- const struct Opt *const *o;
-
- for (o = opts; *o; o++)
- telnet->opt_states[(*o)->index] = INACTIVE;
- } else {
- const struct Opt *const *o;
-
- for (o = opts; *o; o++) {
- telnet->opt_states[(*o)->index] = (*o)->initial_state;
- if (telnet->opt_states[(*o)->index] == REQUESTED)
- send_opt(telnet, (*o)->send, (*o)->option);
- }
- telnet->activated = TRUE;
- }
-
- /*
- * Set up SYNCH state.
- */
- telnet->in_synch = FALSE;
-
- /*
- * We can send special commands from the start.
- */
- update_specials_menu(telnet->frontend);
-
- /*
- * loghost overrides realhost, if specified.
- */
- if (*telnet->cfg.loghost) {
- char *colon;
-
- sfree(*realhost);
- *realhost = dupstr(telnet->cfg.loghost);
- colon = strrchr(*realhost, ':');
- if (colon) {
- /*
- * FIXME: if we ever update this aspect of ssh.c for
- * IPv6 literal management, this should change in line
- * with it.
- */
- *colon++ = '\0';
- }
- }
-
- return NULL;
-}
-
-static void telnet_free(void *handle)
-{
- Telnet telnet = (Telnet) handle;
-
- sfree(telnet->sb_buf);
- if (telnet->s)
- sk_close(telnet->s);
- if (telnet->pinger)
- pinger_free(telnet->pinger);
- sfree(telnet);
-}
-/*
- * Reconfigure the Telnet backend. There's no immediate action
- * necessary, in this backend: we just save the fresh config for
- * any subsequent negotiations.
- */
-static void telnet_reconfig(void *handle, Config *cfg)
-{
- Telnet telnet = (Telnet) handle;
- pinger_reconfig(telnet->pinger, &telnet->cfg, cfg);
- telnet->cfg = *cfg; /* STRUCTURE COPY */
-}
-
-/*
- * Called to send data down the Telnet connection.
- */
-static int telnet_send(void *handle, char *buf, int len)
-{
- Telnet telnet = (Telnet) handle;
- unsigned char *p, *end;
- static const unsigned char iac[2] = { IAC, IAC };
- static const unsigned char cr[2] = { CR, NUL };
-#if 0
- static const unsigned char nl[2] = { CR, LF };
-#endif
-
- if (telnet->s == NULL)
- return 0;
-
- p = (unsigned char *)buf;
- end = (unsigned char *)(buf + len);
- while (p < end) {
- unsigned char *q = p;
-
- while (p < end && iswritable(*p))
- p++;
- telnet->bufsize = sk_write(telnet->s, (char *)q, p - q);
-
- while (p < end && !iswritable(*p)) {
- telnet->bufsize =
- sk_write(telnet->s, (char *)(*p == IAC ? iac : cr), 2);
- p++;
- }
- }
-
- return telnet->bufsize;
-}
-
-/*
- * Called to query the current socket sendability status.
- */
-static int telnet_sendbuffer(void *handle)
-{
- Telnet telnet = (Telnet) handle;
- return telnet->bufsize;
-}
-
-/*
- * Called to set the size of the window from Telnet's POV.
- */
-static void telnet_size(void *handle, int width, int height)
-{
- Telnet telnet = (Telnet) handle;
- unsigned char b[24];
- int n;
- char *logbuf;
-
- telnet->term_width = width;
- telnet->term_height = height;
-
- if (telnet->s == NULL || telnet->opt_states[o_naws.index] != ACTIVE)
- return;
- n = 0;
- b[n++] = IAC;
- b[n++] = SB;
- b[n++] = TELOPT_NAWS;
- b[n++] = telnet->term_width >> 8;
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */
- b[n++] = telnet->term_width & 0xFF;
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */
- b[n++] = telnet->term_height >> 8;
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */
- b[n++] = telnet->term_height & 0xFF;
- if (b[n-1] == IAC) b[n++] = IAC; /* duplicate any IAC byte occurs */
- b[n++] = IAC;
- b[n++] = SE;
- telnet->bufsize = sk_write(telnet->s, (char *)b, n);
- logbuf = dupprintf("client:\tSB NAWS %d,%d",
- telnet->term_width, telnet->term_height);
- logevent(telnet->frontend, logbuf);
- sfree(logbuf);
-}
-
-/*
- * Send Telnet special codes.
- */
-static void telnet_special(void *handle, Telnet_Special code)
-{
- Telnet telnet = (Telnet) handle;
- unsigned char b[2];
-
- if (telnet->s == NULL)
- return;
-
- b[0] = IAC;
- switch (code) {
- case TS_AYT:
- b[1] = AYT;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_BRK:
- b[1] = BREAK;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_EC:
- b[1] = EC;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_EL:
- b[1] = EL;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_GA:
- b[1] = GA;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_NOP:
- b[1] = NOP;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_ABORT:
- b[1] = ABORT;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_AO:
- b[1] = AO;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_IP:
- b[1] = IP;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_SUSP:
- b[1] = SUSP;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_EOR:
- b[1] = EOR;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_EOF:
- b[1] = xEOF;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- break;
- case TS_EOL:
- /* In BINARY mode, CR-LF becomes just CR -
- * and without the NUL suffix too. */
- if (telnet->opt_states[o_we_bin.index] == ACTIVE)
- telnet->bufsize = sk_write(telnet->s, "\r", 1);
- else
- telnet->bufsize = sk_write(telnet->s, "\r\n", 2);
- break;
- case TS_SYNCH:
- b[1] = DM;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 1);
- telnet->bufsize = sk_write_oob(telnet->s, (char *)(b + 1), 1);
- break;
- case TS_RECHO:
- if (telnet->opt_states[o_echo.index] == INACTIVE ||
- telnet->opt_states[o_echo.index] == REALLY_INACTIVE) {
- telnet->opt_states[o_echo.index] = REQUESTED;
- send_opt(telnet, o_echo.send, o_echo.option);
- }
- break;
- case TS_LECHO:
- if (telnet->opt_states[o_echo.index] == ACTIVE) {
- telnet->opt_states[o_echo.index] = REQUESTED;
- send_opt(telnet, o_echo.nsend, o_echo.option);
- }
- break;
- case TS_PING:
- if (telnet->opt_states[o_they_sga.index] == ACTIVE) {
- b[1] = NOP;
- telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
- }
- break;
- default:
- break; /* never heard of it */
- }
-}
-
-static const struct telnet_special *telnet_get_specials(void *handle)
-{
- static const struct telnet_special specials[] = {
- {"Are You There", TS_AYT},
- {"Break", TS_BRK},
- {"Synch", TS_SYNCH},
- {"Erase Character", TS_EC},
- {"Erase Line", TS_EL},
- {"Go Ahead", TS_GA},
- {"No Operation", TS_NOP},
- {NULL, TS_SEP},
- {"Abort Process", TS_ABORT},
- {"Abort Output", TS_AO},
- {"Interrupt Process", TS_IP},
- {"Suspend Process", TS_SUSP},
- {NULL, TS_SEP},
- {"End Of Record", TS_EOR},
- {"End Of File", TS_EOF},
- {NULL, TS_EXITMENU}
- };
- return specials;
-}
-
-static int telnet_connected(void *handle)
-{
- Telnet telnet = (Telnet) handle;
- return telnet->s != NULL;
-}
-
-static int telnet_sendok(void *handle)
-{
- /* Telnet telnet = (Telnet) handle; */
- return 1;
-}
-
-static void telnet_unthrottle(void *handle, int backlog)
-{
- Telnet telnet = (Telnet) handle;
- sk_set_frozen(telnet->s, backlog > TELNET_MAX_BACKLOG);
-}
-
-static int telnet_ldisc(void *handle, int option)
-{
- Telnet telnet = (Telnet) handle;
- if (option == LD_ECHO)
- return telnet->echoing;
- if (option == LD_EDIT)
- return telnet->editing;
- return FALSE;
-}
-
-static void telnet_provide_ldisc(void *handle, void *ldisc)
-{
- Telnet telnet = (Telnet) handle;
- telnet->ldisc = ldisc;
-}
-
-static void telnet_provide_logctx(void *handle, void *logctx)
-{
- /* This is a stub. */
-}
-
-static int telnet_exitcode(void *handle)
-{
- Telnet telnet = (Telnet) handle;
- if (telnet->s != NULL)
- return -1; /* still connected */
- else
- /* Telnet doesn't transmit exit codes back to the client */
- return 0;
-}
-
-/*
- * cfg_info for Telnet does nothing at all.
- */
-static int telnet_cfg_info(void *handle)
-{
- return 0;
-}
-
-Backend telnet_backend = {
- telnet_init,
- telnet_free,
- telnet_reconfig,
- telnet_send,
- telnet_sendbuffer,
- telnet_size,
- telnet_special,
- telnet_get_specials,
- telnet_connected,
- telnet_exitcode,
- telnet_sendok,
- telnet_ldisc,
- telnet_provide_ldisc,
- telnet_provide_logctx,
- telnet_unthrottle,
- telnet_cfg_info,
- "telnet",
- PROT_TELNET,
- 23
-};
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