-#include <windows.h>
+/*
+ * Telnet backend.
+ */
+
#include <stdio.h>
#include <stdlib.h>
+#include <limits.h>
#include "putty.h"
#define TRUE 1
#endif
-static Socket s = NULL;
-
#define IAC 255 /* interpret as command: */
#define DONT 254 /* you are not to use option */
#define DO 253 /* please, you use option */
#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 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 LF 10
#define NUL 0
-#define iswritable(x) ( (x) != IAC && (x) != CR )
+#define iswritable(x) \
+ ( (x) != IAC && \
+ (telnet->opt_states[o_we_bin.index] == ACTIVE || (x) != CR))
-static char *telopt(int opt)
+static const 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 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
+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 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[] = {
+
+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
};
-static int echoing = TRUE, editing = TRUE;
-static int activated = FALSE;
+typedef struct telnet_tag {
+ const struct plug_function_table *fn;
+ /* the above field _must_ be first in the structure */
+
+ Socket s;
+ int closed_on_socket_error;
+
+ 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;
+ int session_started;
+
+ enum {
+ TOP_LEVEL, SEENIAC, SEENWILL, SEENWONT, SEENDO, SEENDONT,
+ SEENSB, SUBNEGOT, SUBNEG_IAC, SEENCR
+ } state;
+
+ Conf *conf;
+
+ Pinger pinger;
+} *Telnet;
+
+#define TELNET_MAX_BACKLOG 4096
-static int in_synch;
-static int sb_opt, sb_len;
-static char *sb_buf = NULL;
-static int sb_size = 0;
#define SB_DELTA 1024
-static void c_write1(int c)
+static void c_write(Telnet telnet, const char *buf, int len)
{
- char cc = (char) c;
- from_backend(0, &cc, 1);
+ 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)
+static void log_option(Telnet telnet, const 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);
+ 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;
- sk_write(s, b, 3);
- log_option("client", cmd, option);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 3);
+ log_option(telnet, "client", cmd, option);
}
-static void deactivate_option(struct Opt *o)
+static void deactivate_option(Telnet telnet, const struct Opt *o)
{
- if (o->state == REQUESTED || o->state == ACTIVE)
- send_opt(o->nsend, o->option);
- o->state = REALLY_INACTIVE;
+ 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(struct Opt *o, int enabled)
+static void option_side_effects(Telnet telnet, const struct Opt *o, int enabled)
{
if (o->option == TELOPT_ECHO && o->send == DO)
- echoing = !enabled;
+ telnet->echoing = !enabled;
else if (o->option == TELOPT_SGA && o->send == DO)
- editing = !enabled;
- ldisc_send(NULL, 0); /* cause ldisc to notice the change */
+ telnet->editing = !enabled;
+ if (telnet->ldisc) /* cause ldisc to notice the change */
+ ldisc_echoedit_update(telnet->ldisc);
/* Ensure we get the minimum options */
- if (!activated) {
- if (o_echo.state == INACTIVE) {
- o_echo.state = REQUESTED;
- send_opt(o_echo.send, o_echo.option);
+ 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 (o_we_sga.state == INACTIVE) {
- o_we_sga.state = REQUESTED;
- send_opt(o_we_sga.send, o_we_sga.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 (o_they_sga.state == INACTIVE) {
- o_they_sga.state = REQUESTED;
- send_opt(o_they_sga.send, o_they_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);
}
- activated = TRUE;
+ telnet->activated = TRUE;
}
}
-static void activate_option(struct Opt *o)
+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 ==
+ deactivate_option(telnet, o->option ==
TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv);
}
- option_side_effects(o, 1);
+ 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;
+ telnet->opt_states[o_oenv.index] == INACTIVE) {
+ send_opt(telnet, WILL, TELOPT_OLD_ENVIRON);
+ telnet->opt_states[o_oenv.index] = REQUESTED;
}
- option_side_effects(o, 0);
+ option_side_effects(telnet, o, 0);
}
-static void proc_rec_opt(int cmd, int option)
+static void proc_rec_opt(Telnet telnet, int cmd, int option)
{
- struct Opt **o;
+ 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);
- option_side_effects(*o, 0);
+ 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)
+static void process_subneg(Telnet telnet)
{
- unsigned char b[2048], *p, *q;
- int var, value, n;
- char *e;
+ 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];
+ 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);
+ strcpy((char *)(b + 4), termspeed);
+ n = 4 + strlen(termspeed);
b[n] = IAC;
b[n + 1] = SE;
- sk_write(s, b, n + 2);
- logevent("server:\tSB TSPEED SEND");
- sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed);
- logevent(logbuf);
+ 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];
+ 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]);
+ 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;
- sk_write(s, b, n + 6);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, n + 6);
b[n + 4] = 0;
- logevent("server:\tSB TTYPE SEND");
- sprintf(logbuf, "client:\tSB TTYPE IS %s", b + 4);
- logevent(logbuf);
+ 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;
+ 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;
}
+ 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] = sb_opt;
+ 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) {
+ if (user) {
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++;
+ for (e = user; *e; e++)
+ b[n++] = *e;
}
b[n++] = IAC;
b[n++] = SE;
- sk_write(s, b, n);
- sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt),
- n == 6 ? "<nothing>" : "<stuff>");
- logevent(logbuf);
+ 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(char *buf, int len)
+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 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 {
- if (!in_synch)
- c_write1(c);
+ if (!telnet->in_synch)
+ ADDTOBUF(c);
#if 1
/* I can't get the F***ing winsock to insert the urgent IAC
* just stop hiding on the next 0xf2 and hope for the best.
*/
else if (c == DM)
- in_synch = 0;
+ telnet->in_synch = 0;
#endif
- 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;
+ telnet->state = SEENDO;
else if (c == DONT)
- telnet_state = SEENDONT;
+ telnet->state = SEENDONT;
else if (c == WILL)
- telnet_state = SEENWILL;
+ telnet->state = SEENWILL;
else if (c == WONT)
- telnet_state = SEENWONT;
+ telnet->state = SEENWONT;
else if (c == SB)
- telnet_state = SEENSB;
+ telnet->state = SEENSB;
else if (c == DM) {
- in_synch = 0;
- telnet_state = TOPLEVEL;
+ telnet->in_synch = 0;
+ telnet->state = TOP_LEVEL;
} else {
/* ignore everything else; print it if it's IAC */
if (c == IAC) {
- c_write1(c);
+ 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 ?
- srealloc(sb_buf, sb_size) :
- smalloc(sb_size));
- if (newbuf)
- sb_buf = newbuf;
- else
- sb_size -= SB_DELTA;
+ 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 int telnet_closing(Plug plug, char *error_msg, int error_code,
+static void telnet_log(Plug plug, int type, SockAddr addr, int port,
+ const char *error_msg, int error_code)
+{
+ Telnet telnet = (Telnet) plug;
+ backend_socket_log(telnet->frontend, type, addr, port,
+ error_msg, error_code, telnet->conf,
+ telnet->session_started);
+}
+
+static int telnet_closing(Plug plug, const char *error_msg, int error_code,
int calling_back)
{
- sk_close(s);
- s = NULL;
+ 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) {
- /* A socket error has occurred. */
- connection_fatal(error_msg);
- } /* Otherwise, the remote side closed the connection normally. */
+ 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)
- in_synch = TRUE;
- do_telnet_read(data, len);
+ telnet->in_synch = TRUE;
+ telnet->session_started = 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'.
+ * Also places the canonical host name into `realhost'. It must be
+ * freed by the caller.
*/
-static char *telnet_init(char *host, int port, char **realhost)
+static const char *telnet_init(void *frontend_handle, void **backend_handle,
+ Conf *conf, const char *host, int port,
+ char **realhost, int nodelay, int keepalive)
{
- static struct plug_function_table fn_table = {
+ static const struct plug_function_table fn_table = {
+ telnet_log,
telnet_closing,
- telnet_receive
- }, *fn_table_ptr = &fn_table;
-
+ telnet_receive,
+ telnet_sent
+ };
SockAddr addr;
- char *err;
+ 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;
+ telnet->session_started = TRUE;
+ *backend_handle = telnet;
/*
* Try to find host.
*/
- addr = sk_namelookup(host, realhost);
- if ((err = sk_addr_error(addr)))
+ addressfamily = conf_get_int(telnet->conf, CONF_addressfamily);
+ addr = name_lookup(host, port, realhost, telnet->conf, addressfamily,
+ telnet->frontend, "Telnet connection");
+ if ((err = sk_addr_error(addr)) != NULL) {
+ sk_addr_free(addr);
return err;
+ }
if (port < 0)
port = 23; /* default telnet port */
/*
* Open socket.
*/
- s = sk_new(addr, port, 0, 1, &fn_table_ptr);
- if ((err = sk_socket_error(s)))
+ 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;
- sk_addr_free(addr);
+ telnet->pinger = pinger_new(telnet->conf, &telnet_backend, telnet);
/*
* Initialise option states.
*/
- if (cfg.passive_telnet) {
- struct Opt **o;
+ if (conf_get_int(telnet->conf, CONF_passive_telnet)) {
+ const struct Opt *const *o;
for (o = opts; *o; o++)
- if ((*o)->state == REQUESTED)
- (*o)->state = INACTIVE;
+ telnet->opt_states[(*o)->index] = INACTIVE;
} else {
- struct Opt **o;
+ const struct Opt *const *o;
- for (o = opts; *o; o++)
- if ((*o)->state == REQUESTED)
- send_opt((*o)->send, (*o)->option);
- activated = TRUE;
+ 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.
*/
- in_synch = FALSE;
+ telnet->in_synch = FALSE;
+
+ /*
+ * We can send special commands from the start.
+ */
+ update_specials_menu(telnet->frontend);
+
+ /*
+ * loghost overrides realhost, if specified.
+ */
+ loghost = conf_get_str(telnet->conf, CONF_loghost);
+ if (*loghost) {
+ char *colon;
+
+ sfree(*realhost);
+ *realhost = dupstr(loghost);
+
+ colon = host_strrchr(*realhost, ':');
+ if (colon)
+ *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);
+}
+/*
+ * 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, 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)
+static int telnet_send(void *handle, const char *buf, int len)
{
- char *p;
- static unsigned char iac[2] = { IAC, IAC };
- static unsigned char cr[2] = { CR, NUL };
- static unsigned char nl[2] = { CR, LF };
+ 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 == NULL)
- 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)
+ while (p < end && iswritable(*p))
p++;
- sk_write(s, q, p - q);
+ telnet->bufsize = sk_write(telnet->s, (char *)q, p - q);
- while (p < buf + len && !iswritable((unsigned char) *p)) {
- sk_write(s, (unsigned char) *p == IAC ? iac : nl, 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)
+static void telnet_size(void *handle, int width, int height)
{
- unsigned char b[16];
- char logbuf[50];
+ Telnet telnet = (Telnet) handle;
+ unsigned char b[24];
+ int n;
+ char *logbuf;
- if (s == NULL || o_naws.state != ACTIVE)
+ telnet->term_width = width;
+ telnet->term_height = height;
+
+ 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;
- sk_write(s, 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 == NULL)
+ if (telnet->s == NULL)
return;
b[0] = IAC;
switch (code) {
case TS_AYT:
b[1] = AYT;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_BRK:
b[1] = BREAK;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_EC:
b[1] = EC;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_EL:
b[1] = EL;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_GA:
b[1] = GA;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_NOP:
b[1] = NOP;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_ABORT:
b[1] = ABORT;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_AO:
b[1] = AO;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_IP:
b[1] = IP;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_SUSP:
b[1] = SUSP;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_EOR:
b[1] = EOR;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
break;
case TS_EOF:
b[1] = xEOF;
- sk_write(s, b, 2);
+ 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;
- sk_write(s, b, 1);
- sk_write_oob(s, b + 1, 1);
+ 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 (o_they_sga.state == ACTIVE) {
+ if (telnet->opt_states[o_they_sga.index] == ACTIVE) {
b[1] = NOP;
- sk_write(s, b, 2);
+ telnet->bufsize = sk_write(telnet->s, (char *)b, 2);
}
break;
+ default:
+ break; /* never heard of it */
}
}
-static Socket telnet_socket(void)
+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)
{
- return s;
+ Telnet telnet = (Telnet) handle;
+ return telnet->s != NULL;
}
-static int telnet_sendok(void)
+static int telnet_sendok(void *handle)
{
+ /* Telnet telnet = (Telnet) handle; */
return 1;
}
-static int telnet_ldisc(int option)
+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 echoing;
+ return telnet->echoing;
if (option == LD_EDIT)
- return editing;
+ 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_free,
+ telnet_reconfig,
telnet_send,
+ telnet_sendbuffer,
telnet_size,
telnet_special,
- telnet_socket,
+ telnet_get_specials,
+ telnet_connected,
+ telnet_exitcode,
telnet_sendok,
telnet_ldisc,
+ telnet_provide_ldisc,
+ telnet_provide_logctx,
+ telnet_unthrottle,
+ telnet_cfg_info,
+ NULL /* test_for_upstream */,
+ "telnet",
+ PROT_TELNET,
23
};