-#include <windows.h>
+/*
+ * Telnet backend.
+ */
+
#include <stdio.h>
#include <stdlib.h>
-#include <winsock.h>
+#include <limits.h>
#include "putty.h"
#define TRUE 1
#endif
-static SOCKET s = INVALID_SOCKET;
-
-#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 TELOPT_BINARY 0 /* 8-bit data path */
-#define TELOPT_ECHO 1 /* echo */
-#define TELOPT_RCP 2 /* prepare to reconnect */
-#define TELOPT_SGA 3 /* suppress go ahead */
-#define TELOPT_NAMS 4 /* approximate message size */
-#define TELOPT_STATUS 5 /* give status */
-#define TELOPT_TM 6 /* timing mark */
-#define TELOPT_RCTE 7 /* remote controlled transmission and echo */
-#define TELOPT_NAOL 8 /* negotiate about output line width */
-#define TELOPT_NAOP 9 /* negotiate about output page size */
-#define TELOPT_NAOCRD 10 /* negotiate about CR disposition */
-#define TELOPT_NAOHTS 11 /* negotiate about horizontal tabstops */
-#define TELOPT_NAOHTD 12 /* negotiate about horizontal tab disposition */
-#define TELOPT_NAOFFD 13 /* negotiate about formfeed disposition */
-#define TELOPT_NAOVTS 14 /* negotiate about vertical tab stops */
-#define TELOPT_NAOVTD 15 /* negotiate about vertical tab disposition */
-#define TELOPT_NAOLFD 16 /* negotiate about output LF disposition */
-#define TELOPT_XASCII 17 /* extended ascic character set */
-#define TELOPT_LOGOUT 18 /* force logout */
-#define TELOPT_BM 19 /* byte macro */
-#define TELOPT_DET 20 /* data entry terminal */
-#define TELOPT_SUPDUP 21 /* supdup protocol */
-#define TELOPT_SUPDUPOUTPUT 22 /* supdup output */
-#define TELOPT_SNDLOC 23 /* send location */
-#define TELOPT_TTYPE 24 /* terminal type */
-#define TELOPT_EOR 25 /* end or record */
-#define TELOPT_TUID 26 /* TACACS user identification */
-#define TELOPT_OUTMRK 27 /* output marking */
-#define TELOPT_TTYLOC 28 /* terminal location number */
-#define TELOPT_3270REGIME 29 /* 3270 regime */
-#define TELOPT_X3PAD 30 /* X.3 PAD */
-#define TELOPT_NAWS 31 /* window size */
-#define TELOPT_TSPEED 32 /* terminal speed */
-#define TELOPT_LFLOW 33 /* remote flow control */
-#define TELOPT_LINEMODE 34 /* Linemode option */
-#define TELOPT_XDISPLOC 35 /* X Display Location */
-#define TELOPT_OLD_ENVIRON 36 /* Old - Environment variables */
-#define TELOPT_AUTHENTICATION 37/* Authenticate */
-#define TELOPT_ENCRYPT 38 /* Encryption option */
-#define TELOPT_NEW_ENVIRON 39 /* New - Environment variables */
-#define TELOPT_EXOPL 255 /* extended-options-list */
-
-#define TELQUAL_IS 0 /* option is... */
-#define TELQUAL_SEND 1 /* send option */
-#define TELQUAL_INFO 2 /* ENVIRON: informational version of IS */
+#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 LF 10
#define NUL 0
-#define iswritable(x) ( (x) != IAC && (x) != CR )
-
-static char *telopt(int opt) {
-#define i(x) if (opt == TELOPT_ ## x) return #x;
- i(BINARY); i(ECHO); i(RCP); i(SGA); i(NAMS); i(STATUS); i(TM); i(RCTE);
- i(NAOL); i(NAOP); i(NAOCRD); i(NAOHTS); i(NAOHTD); i(NAOFFD); i(NAOVTS);
- i(NAOVTD); i(NAOLFD); i(XASCII); i(LOGOUT); i(BM); i(DET); i(SUPDUP);
- i(SUPDUPOUTPUT); i(SNDLOC); i(TTYPE); i(EOR); i(TUID); i(OUTMRK);
- i(TTYLOC); i(X3PAD); i(NAWS); i(TSPEED); i(LFLOW); i(LINEMODE);
- i(XDISPLOC); i(OLD_ENVIRON); i(AUTHENTICATION); i(ENCRYPT);
- i(NEW_ENVIRON); i(EXOPL);
-#undef i
- return "<unknown>";
+#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);
+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
- } state;
+ } initial_state;
};
-static struct Opt o_naws = {WILL, WONT, DO, DONT, TELOPT_NAWS, REQUESTED};
-static struct Opt o_tspeed = {WILL, WONT, DO, DONT, TELOPT_TSPEED, REQUESTED};
-static struct Opt o_ttype = {WILL, WONT, DO, DONT, TELOPT_TTYPE, REQUESTED};
-static struct Opt o_oenv = {WILL, WONT, DO, DONT, TELOPT_OLD_ENVIRON,
- INACTIVE};
-static struct Opt o_nenv = {WILL, WONT, DO, DONT, TELOPT_NEW_ENVIRON,
- REQUESTED};
-static struct Opt o_echo = {DO, DONT, WILL, WONT, TELOPT_ECHO, REQUESTED};
-static struct Opt o_we_sga = {WILL, WONT, DO, DONT, TELOPT_SGA, REQUESTED};
-static struct Opt o_they_sga = {DO, DONT, WILL, WONT, TELOPT_SGA, REQUESTED};
-
-static struct Opt *opts[] = {
+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, NULL
+ &o_we_sga, &o_they_sga, &o_we_bin, &o_they_bin, NULL
};
-#if 0
-static int in_synch;
-#endif
+typedef struct telnet_tag {
+ const struct plug_function_table *fn;
+ /* the above field _must_ be first in the structure */
-static int sb_opt, sb_len;
-static char *sb_buf = NULL;
-static int sb_size = 0;
-#define SB_DELTA 1024
+ Socket s;
+ int closed_on_socket_error;
-static void try_write (void) {
- while (outbuf_head != outbuf_reap) {
- int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE);
- int len = end - outbuf_reap;
- int ret;
+ void *frontend;
+ void *ldisc;
+ int term_width, term_height;
- ret = send (s, outbuf+outbuf_reap, len, 0);
- if (ret > 0)
- outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK;
- if (ret < len)
- return;
- }
-}
+ int opt_states[NUM_OPTS];
-static void s_write (void *buf, int len) {
- unsigned char *p = buf;
- while (len--) {
- int new_head = (outbuf_head + 1) & OUTBUF_MASK;
- if (new_head != outbuf_reap) {
- outbuf[outbuf_head] = *p++;
- outbuf_head = new_head;
- }
- }
- try_write();
-}
+ int echoing, editing;
+ int activated;
+ int bufsize;
+ int in_synch;
+ int sb_opt, sb_len;
+ unsigned char *sb_buf;
+ int sb_size;
-static void c_write (char *buf, int len) {
- while (len--) {
- int new_head = (inbuf_head + 1) & INBUF_MASK;
- if (new_head != inbuf_reap) {
- inbuf[inbuf_head] = *buf++;
- inbuf_head = new_head;
- } else {
- term_out();
- if( inbuf_head == inbuf_reap ) len++; else break;
- }
- }
+ enum {
+ TOP_LEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
+ SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
+ } state;
+
+ Conf *conf;
+
+ 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 (char *sender, int cmd, int option) {
- char buf[50];
- sprintf(buf, "%s:\t%s %s", sender,
- (cmd == WILL ? "WILL" : cmd == WONT ? "WONT" :
- cmd == DO ? "DO" : cmd == DONT ? "DONT" : "<??>"),
- telopt(option));
- logevent(buf);
+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 (int cmd, int option) {
+static void send_opt(Telnet telnet, int cmd, int option)
+{
unsigned char b[3];
- b[0] = IAC; b[1] = cmd; b[2] = option;
- s_write (b, 3);
- log_option("client", cmd, option);
+ 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 (struct Opt *o) {
- if (o->state == REQUESTED || o->state == ACTIVE)
- send_opt (o->nsend, o->option);
- o->state = REALLY_INACTIVE;
+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;
}
-static void activate_option (struct Opt *o) {
+/*
+ * 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_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 (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
- }
- if (o->option == TELOPT_ECHO)
- {
- cfg.ldisc_term = FALSE;
- ldisc = &ldisc_simple;
+ deactivate_option(telnet, o->option ==
+ TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
}
+ option_side_effects(telnet, o, 1);
}
-static void refused_option (struct Opt *o) {
+static void refused_option(Telnet telnet, const struct Opt *o)
+{
if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
- o_oenv.state == INACTIVE) {
- send_opt (WILL, TELOPT_OLD_ENVIRON);
- o_oenv.state = REQUESTED;
- }
- if (o->option == TELOPT_ECHO)
- {
- cfg.ldisc_term = TRUE;
- ldisc = &ldisc_term;
+ 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 (int cmd, int option) {
- struct Opt **o;
+static void proc_rec_opt(Telnet telnet, int cmd, int option)
+{
+ const struct Opt *const *o;
- log_option ("server", cmd, option);
+ log_option(telnet, "server", cmd, option);
for (o = opts; *o; o++) {
if ((*o)->option == option && (*o)->ack == cmd) {
- switch ((*o)->state) {
+ switch (telnet->opt_states[(*o)->index]) {
case REQUESTED:
- (*o)->state = ACTIVE;
- activate_option (*o);
+ telnet->opt_states[(*o)->index] = ACTIVE;
+ activate_option(telnet, *o);
break;
case ACTIVE:
break;
case INACTIVE:
- (*o)->state = ACTIVE;
- send_opt ((*o)->send, option);
- activate_option (*o);
+ telnet->opt_states[(*o)->index] = ACTIVE;
+ send_opt(telnet, (*o)->send, option);
+ activate_option(telnet, *o);
break;
case REALLY_INACTIVE:
- send_opt ((*o)->nsend, option);
+ send_opt(telnet, (*o)->nsend, option);
break;
}
return;
} else if ((*o)->option == option && (*o)->nak == cmd) {
- switch ((*o)->state) {
+ switch (telnet->opt_states[(*o)->index]) {
case REQUESTED:
- (*o)->state = INACTIVE;
- refused_option (*o);
+ telnet->opt_states[(*o)->index] = INACTIVE;
+ refused_option(telnet, *o);
break;
case ACTIVE:
- (*o)->state = INACTIVE;
- send_opt ((*o)->nsend, option);
+ telnet->opt_states[(*o)->index] = INACTIVE;
+ send_opt(telnet, (*o)->nsend, option);
+ option_side_effects(telnet, *o, 0);
break;
case INACTIVE:
case REALLY_INACTIVE:
}
/*
* If we reach here, the option was one we weren't prepared to
- * cope with. So send a negative ack.
+ * 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.
*/
- send_opt ((cmd == WILL ? DONT : WONT), option);
+ if (cmd == WILL || cmd == DO)
+ send_opt(telnet, (cmd == WILL ? DONT : WONT), option);
}
-static void process_subneg (void) {
- unsigned char b[2048], *p, *q;
- int var, value, n;
- char *e;
+static void process_subneg(Telnet telnet)
+{
+ unsigned char *b, *p, *q;
+ int var, value, n, bsize;
+ char *e, *eval, *ekey, *user;
- switch (sb_opt) {
+ switch (telnet->sb_opt) {
case TELOPT_TSPEED:
- if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
- char logbuf[sizeof(cfg.termspeed)+80];
- b[0] = IAC; b[1] = SB; b[2] = TELOPT_TSPEED;
+ if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {
+ char *logbuf;
+ char *termspeed = conf_get_str(telnet->conf, CONF_termspeed);
+ b = snewn(20 + strlen(termspeed), unsigned char);
+ b[0] = IAC;
+ b[1] = SB;
+ b[2] = TELOPT_TSPEED;
b[3] = TELQUAL_IS;
- strcpy(b+4, cfg.termspeed);
- n = 4 + strlen(cfg.termspeed);
- b[n] = IAC; b[n+1] = SE;
- s_write (b, n+2);
- logevent("server:\tSB TSPEED SEND");
- sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed);
- logevent (logbuf);
+ strcpy((char *)(b + 4), termspeed);
+ n = 4 + strlen(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", termspeed);
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ sfree(b);
} else
- logevent ("server:\tSB TSPEED <something weird>");
+ logevent(telnet->frontend, "server:\tSB TSPEED <something weird>");
break;
case TELOPT_TTYPE:
- if (sb_len == 1 && sb_buf[0] == TELQUAL_SEND) {
- char logbuf[sizeof(cfg.termtype)+80];
- b[0] = IAC; b[1] = SB; b[2] = TELOPT_TTYPE;
+ if (telnet->sb_len == 1 && telnet->sb_buf[0] == TELQUAL_SEND) {
+ char *logbuf;
+ char *termtype = conf_get_str(telnet->conf, CONF_termtype);
+ b = snewn(20 + strlen(termtype), unsigned char);
+ b[0] = IAC;
+ b[1] = SB;
+ b[2] = TELOPT_TTYPE;
b[3] = TELQUAL_IS;
- for (n = 0; cfg.termtype[n]; n++)
- b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ?
- cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]);
- b[n+4] = IAC; b[n+5] = SE;
- s_write (b, n+6);
- b[n+4] = 0;
- logevent("server:\tSB TTYPE SEND");
- sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4);
- logevent(logbuf);
+ for (n = 0; termtype[n]; n++)
+ b[n + 4] = (termtype[n] >= 'a' && termtype[n] <= 'z' ?
+ termtype[n] + 'A' - 'a' :
+ 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);
+ sfree(b);
} else
- logevent("server:\tSB TTYPE <something weird>\r\n");
+ logevent(telnet->frontend, "server:\tSB TTYPE <something weird>\r\n");
break;
case TELOPT_OLD_ENVIRON:
- case TELOPT_NEW_ENVIRON:
- p = sb_buf;
- q = p + sb_len;
+ case TELOPT_NEW_ENVIRON:
+ p = telnet->sb_buf;
+ q = p + telnet->sb_len;
if (p < q && *p == TELQUAL_SEND) {
- char logbuf[50];
+ char *logbuf;
p++;
- sprintf (logbuf, "server:\tSB %s SEND", telopt(sb_opt));
- logevent (logbuf);
- if (sb_opt == TELOPT_OLD_ENVIRON) {
- if (cfg.rfc_environ) {
+ logbuf = dupprintf("server:\tSB %s SEND", telopt(telnet->sb_opt));
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ if (telnet->sb_opt == TELOPT_OLD_ENVIRON) {
+ if (conf_get_int(telnet->conf, CONF_rfc_environ)) {
value = RFC_VALUE;
var = RFC_VAR;
} else {
value = RFC_VALUE;
var = RFC_VAR;
}
- b[0] = IAC; b[1] = SB; b[2] = sb_opt;
+ bsize = 20;
+ for (eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ NULL, &ekey);
+ eval != NULL;
+ eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ ekey, &ekey))
+ bsize += strlen(ekey) + strlen(eval) + 2;
+ user = get_remote_username(telnet->conf);
+ if (user)
+ bsize += 6 + strlen(user);
+
+ b = snewn(bsize, unsigned char);
+ b[0] = IAC;
+ b[1] = SB;
+ b[2] = telnet->sb_opt;
b[3] = TELQUAL_IS;
n = 4;
- e = cfg.environmt;
- while (*e) {
+ for (eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ NULL, &ekey);
+ eval != NULL;
+ eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ ekey, &ekey)) {
b[n++] = var;
- while (*e && *e != '\t') b[n++] = *e++;
- if (*e == '\t') e++;
+ for (e = ekey; *e; e++)
+ b[n++] = *e;
b[n++] = value;
- while (*e) b[n++] = *e++;
- e++;
+ for (e = eval; *e; e++)
+ b[n++] = *e;
}
- if (*cfg.username) {
- b[n++] = var; b[n++] = 'U'; b[n++] = 'S';
- b[n++] = 'E'; b[n++] = 'R'; b[n++] = value;
- e = cfg.username;
- while (*e) b[n++] = *e++;
+ if (user) {
+ b[n++] = var;
+ b[n++] = 'U';
+ b[n++] = 'S';
+ b[n++] = 'E';
+ b[n++] = 'R';
+ b[n++] = value;
+ for (e = user; *e; e++)
+ b[n++] = *e;
}
- b[n++] = IAC; b[n++] = SE;
- s_write (b, n);
- sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt),
- n==6 ? "<nothing>" : "<stuff>");
- logevent (logbuf);
+ b[n++] = IAC;
+ b[n++] = SE;
+ telnet->bufsize = sk_write(telnet->s, (char *)b, n);
+ if (n == 6) {
+ logbuf = dupprintf("client:\tSB %s IS <nothing>",
+ telopt(telnet->sb_opt));
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ } else {
+ logbuf = dupprintf("client:\tSB %s IS:",
+ telopt(telnet->sb_opt));
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ for (eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ NULL, &ekey);
+ eval != NULL;
+ eval = conf_get_str_strs(telnet->conf, CONF_environmt,
+ ekey, &ekey)) {
+ logbuf = dupprintf("\t%s=%s", ekey, eval);
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ }
+ if (user) {
+ logbuf = dupprintf("\tUSER=%s", user);
+ logevent(telnet->frontend, logbuf);
+ sfree(logbuf);
+ }
+ }
+ sfree(b);
+ sfree(user);
}
break;
}
}
-static enum {
- TOPLEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
- SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
-} telnet_state = TOPLEVEL;
+static void do_telnet_read(Telnet telnet, char *buf, int len)
+{
+ char *outbuf = NULL;
+ int outbuflen = 0, outbufsize = 0;
-static void do_telnet_read (char *buf, int len) {
- unsigned char b[10];
+#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 TOPLEVEL:
+ switch (telnet->state) {
+ case TOP_LEVEL:
case SEENCR:
- if (c == NUL && telnet_state == SEENCR)
- telnet_state = TOPLEVEL;
+ if (c == NUL && telnet->state == SEENCR)
+ telnet->state = TOP_LEVEL;
else if (c == IAC)
- telnet_state = SEENIAC;
+ telnet->state = SEENIAC;
else {
- b[0] = c;
-#if 0
- if (!in_synch)
+ 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
- c_write (b, 1);
- if (c == CR)
- telnet_state = SEENCR;
+ if (c == CR && telnet->opt_states[o_they_bin.index] != ACTIVE)
+ telnet->state = SEENCR;
else
- telnet_state = TOPLEVEL;
+ 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 == 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) {
- b[0] = c;
- c_write(b,1);
+ ADDTOBUF(c);
}
- telnet_state = TOPLEVEL;
+ telnet->state = TOP_LEVEL;
}
break;
case SEENWILL:
- proc_rec_opt (WILL, c);
- telnet_state = TOPLEVEL;
+ proc_rec_opt(telnet, WILL, c);
+ telnet->state = TOP_LEVEL;
break;
case SEENWONT:
- proc_rec_opt (WONT, c);
- telnet_state = TOPLEVEL;
+ proc_rec_opt(telnet, WONT, c);
+ telnet->state = TOP_LEVEL;
break;
case SEENDO:
- proc_rec_opt (DO, c);
- telnet_state = TOPLEVEL;
+ proc_rec_opt(telnet, DO, c);
+ telnet->state = TOP_LEVEL;
break;
case SEENDONT:
- proc_rec_opt (DONT, c);
- telnet_state = TOPLEVEL;
+ proc_rec_opt(telnet, DONT, c);
+ telnet->state = TOP_LEVEL;
break;
case SEENSB:
- sb_opt = c;
- sb_len = 0;
- telnet_state = SUBNEGOT;
+ telnet->sb_opt = c;
+ telnet->sb_len = 0;
+ telnet->state = SUBNEGOT;
break;
case SUBNEGOT:
if (c == IAC)
- telnet_state = SUBNEG_IAC;
+ telnet->state = SUBNEG_IAC;
else {
- subneg_addchar:
- if (sb_len >= sb_size) {
- char *newbuf;
- sb_size += SB_DELTA;
- newbuf = (sb_buf ?
- realloc(sb_buf, sb_size) :
- malloc(sb_size));
- if (newbuf)
- sb_buf = newbuf;
- else
- sb_size -= SB_DELTA;
+ 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);
}
- if (sb_len < sb_size)
- sb_buf[sb_len++] = c;
- telnet_state = SUBNEGOT;/* in case we came here by goto */
+ 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_state = TOPLEVEL;
+ 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);
+ sfree(msg);
+}
+
+static int telnet_closing(Plug plug, const char *error_msg, int error_code,
+ int calling_back)
+{
+ Telnet telnet = (Telnet) plug;
+
+ /*
+ * We don't implement independent EOF in each direction for Telnet
+ * connections; as soon as we get word that the remote side has
+ * sent us EOF, we wind up the whole connection.
+ */
+
+ if (telnet->s) {
+ sk_close(telnet->s);
+ telnet->s = NULL;
+ if (error_msg)
+ telnet->closed_on_socket_error = TRUE;
+ 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. Will arrange for
- * WM_NETEVENT messages to be passed to the specified window, whose
- * window procedure should then call telnet_msg().
+ * Called to set up the Telnet connection.
*
* Returns an error message, or NULL on success.
*
- * Also places the canonical host name into `realhost'.
+ * Also places the canonical host name into `realhost'. It must be
+ * freed by the caller.
*/
-static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) {
- SOCKADDR_IN addr;
- struct hostent *h;
- unsigned long a;
+static const char *telnet_init(void *frontend_handle, void **backend_handle,
+ Conf *conf, 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;
+ char *loghost;
+ int addressfamily;
+
+ telnet = snew(struct telnet_tag);
+ telnet->fn = &fn_table;
+ telnet->conf = conf_copy(conf);
+ telnet->s = NULL;
+ telnet->closed_on_socket_error = FALSE;
+ telnet->echoing = TRUE;
+ telnet->editing = TRUE;
+ telnet->activated = FALSE;
+ telnet->sb_buf = NULL;
+ telnet->sb_size = 0;
+ telnet->frontend = frontend_handle;
+ telnet->term_width = conf_get_int(telnet->conf, CONF_width);
+ telnet->term_height = conf_get_int(telnet->conf, CONF_height);
+ telnet->state = TOP_LEVEL;
+ telnet->ldisc = NULL;
+ telnet->pinger = NULL;
+ *backend_handle = telnet;
/*
* Try to find host.
*/
- if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
- if ( (h = gethostbyname(host)) == NULL)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAHOST_NOT_FOUND: case WSANO_DATA:
- return "Host does not exist";
- case WSATRY_AGAIN: return "Host not found";
- default: return "gethostbyname: unknown error";
- }
- memcpy (&a, h->h_addr, sizeof(a));
- *realhost = h->h_name;
- } else
- *realhost = host;
- a = ntohl(a);
+ {
+ char *buf;
+ addressfamily = conf_get_int(telnet->conf, CONF_addressfamily);
+ buf = dupprintf("Looking up host \"%s\"%s", host,
+ (addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" :
+ (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" :
+ "")));
+ logevent(telnet->frontend, buf);
+ sfree(buf);
+ }
+ addr = name_lookup(host, port, realhost, telnet->conf, addressfamily);
+ if ((err = sk_addr_error(addr)) != NULL) {
+ sk_addr_free(addr);
+ return err;
+ }
if (port < 0)
port = 23; /* default telnet port */
/*
* Open socket.
*/
- s = socket(AF_INET, SOCK_STREAM, 0);
- if (s == INVALID_SOCKET)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAEAFNOSUPPORT: return "TCP/IP support not present";
- default: return "socket(): unknown error";
- }
+ telnet->s = new_connection(addr, *realhost, port, 0, 1,
+ nodelay, keepalive, (Plug) telnet, telnet->conf);
+ if ((err = sk_socket_error(telnet->s)) != NULL)
+ return err;
-#if 0
- {
- BOOL b = TRUE;
- setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b));
- }
-#endif
+ telnet->pinger = pinger_new(telnet->conf, &telnet_backend, telnet);
/*
- * Bind to local address.
+ * Initialise option states.
*/
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = htonl(INADDR_ANY);
- addr.sin_port = htons(0);
- if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- default: return "bind(): unknown error";
- }
+ if (conf_get_int(telnet->conf, CONF_passive_telnet)) {
+ const struct Opt *const *o;
- /*
- * Connect to remote address.
- */
- addr.sin_addr.s_addr = htonl(a);
- addr.sin_port = htons((short)port);
- if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- case WSAECONNREFUSED: return "Connection refused";
- case WSAENETUNREACH: return "Network is unreachable";
- case WSAEHOSTUNREACH: return "No route to host";
- default: return "connect(): unknown error";
- }
+ for (o = opts; *o; o++)
+ telnet->opt_states[(*o)->index] = INACTIVE;
+ } else {
+ const struct Opt *const *o;
- if (WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ |
- FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR)
- switch (WSAGetLastError()) {
- case WSAENETDOWN: return "Network is down";
- default: return "WSAAsyncSelect(): unknown error";
+ 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;
+ }
/*
- * Initialise option states.
+ * Set up SYNCH state.
*/
- {
- struct Opt **o;
+ telnet->in_synch = FALSE;
- for (o = opts; *o; o++)
- if ((*o)->state == REQUESTED)
- send_opt ((*o)->send, (*o)->option);
- }
+ /*
+ * We can send special commands from the start.
+ */
+ update_specials_menu(telnet->frontend);
-#if 0
/*
- * Set up SYNCH state.
+ * loghost overrides realhost, if specified.
*/
- in_synch = FALSE;
-#endif
+ loghost = conf_get_str(telnet->conf, CONF_loghost);
+ if (*loghost) {
+ char *colon;
+
+ sfree(*realhost);
+ *realhost = dupstr(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);
+ conf_free(telnet->conf);
+ sfree(telnet);
+}
/*
- * Process a WM_NETEVENT message. Will return 0 if the connection
- * has closed, or <0 for a socket error.
+ * Reconfigure the Telnet backend. There's no immediate action
+ * necessary, in this backend: we just save the fresh config for
+ * any subsequent negotiations.
*/
-static int telnet_msg (WPARAM wParam, LPARAM lParam) {
- int ret;
- char buf[256];
-
- /*
- * Because reading less than the whole of the available pending
- * data can generate an FD_READ event, we need to allow for the
- * possibility that FD_READ may arrive with FD_CLOSE already in
- * the queue; so it's possible that we can get here even with s
- * invalid. If so, we return 1 and don't worry about it.
- */
- if (s == INVALID_SOCKET)
- return 1;
-
- if (WSAGETSELECTERROR(lParam) != 0)
- return -WSAGETSELECTERROR(lParam);
-
- switch (WSAGETSELECTEVENT(lParam)) {
- case FD_READ:
- case FD_CLOSE:
- ret = recv(s, buf, sizeof(buf), 0);
- if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK)
- return 1;
- if (ret < 0) /* any _other_ error */
- return -10000-WSAGetLastError();
- if (ret == 0) {
- s = INVALID_SOCKET;
- return 0;
- }
-#if 0
- if (in_synch) {
- BOOL i;
- if (ioctlsocket (s, SIOCATMARK, &i) < 0) {
- return -20000-WSAGetLastError();
- }
- if (i)
- in_synch = FALSE;
- }
-#endif
- do_telnet_read (buf, ret);
- return 1;
- case FD_OOB:
- do {
- ret = recv(s, buf, sizeof(buf), 0);
- } while (ret > 0);
- telnet_state = TOPLEVEL;
- do {
- ret = recv(s, buf, 1, MSG_OOB);
- if (ret > 0)
- do_telnet_read (buf, ret);
- } while (ret > 0);
- if (ret < 0 && WSAGetLastError() != WSAEWOULDBLOCK)
- return -30000-WSAGetLastError();
- return 1;
- case FD_WRITE:
- if (outbuf_head != outbuf_reap)
- try_write();
- return 1;
- }
- return 1; /* shouldn't happen, but WTF */
+static void telnet_reconfig(void *handle, Conf *conf)
+{
+ Telnet telnet = (Telnet) handle;
+ pinger_reconfig(telnet->pinger, telnet->conf, conf);
+ conf_free(telnet->conf);
+ telnet->conf = conf_copy(conf);
}
/*
* Called to send data down the Telnet connection.
*/
-static void telnet_send (char *buf, int len) {
- char *p;
- static unsigned char iac[2] = { IAC, IAC };
- static unsigned char cr[2] = { CR, NUL };
+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 (s == INVALID_SOCKET)
- return;
+ if (telnet->s == NULL)
+ return 0;
- p = buf;
- while (p < buf+len) {
- char *q = p;
+ p = (unsigned char *)buf;
+ end = (unsigned char *)(buf + len);
+ while (p < end) {
+ unsigned char *q = p;
- while (iswritable((unsigned char)*p) && p < buf+len) p++;
- s_write (q, p-q);
+ while (p < end && iswritable(*p))
+ p++;
+ telnet->bufsize = sk_write(telnet->s, (char *)q, p - q);
- while (p < buf+len && !iswritable((unsigned char)*p)) {
- s_write ((unsigned char)*p == IAC ? iac : cr, 2);
+ 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) {
- unsigned char b[16];
- char logbuf[50];
+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 (s == INVALID_SOCKET || o_naws.state != ACTIVE)
+ if (telnet->s == NULL || telnet->opt_states[o_naws.index] != ACTIVE)
return;
- b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS;
- b[3] = cols >> 8; b[4] = cols & 0xFF;
- b[5] = rows >> 8; b[6] = rows & 0xFF;
- b[7] = IAC; b[8] = SE;
- s_write (b, 9);
- sprintf(logbuf, "client:\tSB NAWS %d,%d",
- ((unsigned char)b[3] << 8) + (unsigned char)b[4],
- ((unsigned char)b[5] << 8) + (unsigned char)b[6]);
- logevent (logbuf);
+ 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 (Telnet_Special code) {
+static void telnet_special(void *handle, Telnet_Special code)
+{
+ Telnet telnet = (Telnet) handle;
unsigned char b[2];
- if (s == INVALID_SOCKET)
+ if (telnet->s == NULL)
return;
b[0] = IAC;
switch (code) {
- case TS_AYT: b[1] = AYT; s_write (b, 2); break;
- case TS_BRK: b[1] = BREAK; s_write (b, 2); break;
- case TS_EC: b[1] = EC; s_write (b, 2); break;
- case TS_EL: b[1] = EL; s_write (b, 2); break;
- case TS_GA: b[1] = GA; s_write (b, 2); break;
- case TS_NOP: b[1] = NOP; s_write (b, 2); break;
- case TS_ABORT: b[1] = ABORT; s_write (b, 2); break;
- case TS_AO: b[1] = AO; s_write (b, 2); break;
- case TS_IP: b[1] = IP; s_write (b, 2); break;
- case TS_SUSP: b[1] = SUSP; s_write (b, 2); break;
- case TS_EOR: b[1] = EOR; s_write (b, 2); break;
- case TS_EOF: b[1] = xEOF; s_write (b, 2); break;
+ 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:
- outbuf_head = outbuf_reap = 0;
b[1] = DM;
- send (s, b, 2, MSG_OOB);
+ 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 (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) {
- o_echo.state = REQUESTED;
- send_opt (o_echo.send, o_echo.option);
+ 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 (o_echo.state == ACTIVE) {
- o_echo.state = REQUESTED;
- send_opt (o_echo.nsend, o_echo.option);
+ 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 if (telnet->closed_on_socket_error)
+ return INT_MAX; /* a socket error counts as an unclean exit */
+ 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_msg,
+ telnet_free,
+ telnet_reconfig,
telnet_send,
+ telnet_sendbuffer,
telnet_size,
- telnet_special
+ 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
};
projects / u / mdw / putty / blobdiff