psyc-mirrors/psyclpc
1
0
Fork 0
mirror of git://git.psyced.org/git/psyclpc synced 2024-08-15 03:20:16 +00:00
Code Issues Releases Wiki Activity
psyclpc/mudlib/telnetneg.c
PSYC 2ede0de60e initial git creation
2009-03-03 04:27:01 +01:00

1247 lines
38 KiB
C
Raw Blame History

//
// Wunderland Mudlib
//
// secure/telnetneg.c -- Manage telnet negotations
//
// This telnet implementation is 'unconditionally compliant'
// to RFC 1143 and so follows all rules of the telnet protocol RFC 854.
// The driver itself is not quite compliant.
//
// Find the newest version of this file at
// http://wl.mud.de/mud/doc/wwwstd/standardobjekte.html
//
// $Log: telnetneg.c,v $
// Revision 1.1.1.1 2006/07/10 02:42:09 lynx
// ldmud 3.3.714
//
// Revision 1.25 2003/07/07 07:08:52 Fiona
// LM_SLC more save against protocol violations
//
#pragma strict_types
#include <input_to.h> // INPUT_*
#include <config.h> // ROOTID
#include <properties.h> // P_* macros
#define NEED_PROTOTYPES
#include <thing/properties.h> // SetProp() proto
#define NEED_PRIVATE_PROTOTYPES
#include <telnetneg.h>
#define GET_ALL_TTYPES
// ******************** Telnet State Machine ********************
//
// The following code is the implementation of the telnet state
// machine as suggested with RFC 1143.
//
// The machine is used with three functions:
// set_telnet() requests a change in the telnet state
// set_callback() sets our prefered telnet states and a callback
// function which is called on telnet state changes
// query_telnet() query state and sb info
//
// The driver communicates with the engine through the H_TELNET_NEG
// and got_telnet().
//
// Do this in logon() to turn IAC quoting on:
// set_connection_charset(({255})*32, 1);
//
// Do this in logon() to start telnet negotiation:
// set_telnet(WILL, TELOPT_ECHO);
// set_telnet(WONT, TELOPT_ECHO);
// alternatively you could do the following, which is not as robust
// set_telnet(WILL, TELOPT_EOR);
nosave mapping ts; // Complete telnet negotation state
// Set preferences and callbacks
//
// r_a_cb is the preference for the state on the remote side. It could be
// DO, DONT or a callback closure which decides if we get a request.
// l_a_cb is the same for the local side.
// change_cb is called if the state changes to NO or YES (real change)
// sb_cb is called with incoming subnegotiations.
private void set_callback(int opt, mixed r_a_cb, mixed l_a_cb,
closure change_cb, closure sb_cb) {
if (r_a_cb == DO) r_a_cb = 1;
else if (r_a_cb == DONT) r_a_cb = 0;
if (l_a_cb == WILL) l_a_cb = 1;
else if (l_a_cb == WONT) l_a_cb = 0;
ts[opt, TS_R_AGREE] = r_a_cb;
ts[opt, TS_L_AGREE] = l_a_cb;
ts[opt, TS_CB] = change_cb;
ts[opt, TS_SBCB] = sb_cb;
}
// Try to change an option
// True is returned if the option indeed changes
static int set_telnet(int command, int option) {
int state, ok;
state = ts[option, TS_STATE];
switch (command) {
case DO:
if (Q_REMOTER(state) == REJECTED) break;
switch (Q_REMOTE(state)) {
case YES:
break; // ignore, it's already enabled
case NO:
state = S_REMOTE(state, WANT_YES);
send(({ IAC, DO, option }));
ok = 1;
break;
case WANT_NO:
if (Q_REMOTEQ(state) == Q_EMPTY) {
state = S_REMOTEQ(state, Q_OPPOSITE);
ok = 1;
} else {
// ignore, request sent already
}
break;
case WANT_YES:
if (Q_REMOTEQ(state) == Q_EMPTY) {
// ignore, request sent already
} else {
state = S_REMOTEQ(state, Q_EMPTY);
ok = 1;
}
break;
}
break;
case DONT:
switch (Q_REMOTE(state)) {
case NO:
break; // ignore, it's already disabled
case YES:
state = S_REMOTE(state, WANT_NO);
send(({ IAC, DONT, option }));
ok = 1;
break;
case WANT_NO:
if (Q_REMOTEQ(state) == Q_EMPTY) {
// ignore, request sent already
} else {
state = S_REMOTEQ(state, Q_EMPTY);
ok = 1;
}
break;
case WANT_YES:
if (Q_REMOTEQ(state) == Q_EMPTY) {
state = S_REMOTEQ(state, Q_OPPOSITE);
ok = 1;
} else {
// ignore, request sent already
}
break;
}
break;
case WILL:
if (Q_LOCALR(state) == REJECTED) break;
switch (Q_LOCAL(state)) {
case NO:
state = S_LOCAL(state, WANT_YES);
send(({ IAC, WILL, option }));
ok = 1;
break;
case YES:
break; // ignore, it's already enabled
case WANT_NO:
if (Q_LOCALQ(state) == Q_EMPTY) {
state = S_LOCALQ(state, Q_OPPOSITE);
ok = 1;
} else {
// ignore, request sent already
}
break;
case WANT_YES:
if (Q_LOCALQ(state) == Q_EMPTY) {
// ignore, request sent already
} else {
state = S_LOCALQ(state, Q_EMPTY);
ok = 1;
}
break;
}
break;
case WONT:
switch (Q_LOCAL(state)) {
case NO:
break; // ignore, it's already disabled
case YES:
state = S_LOCAL(state, WANT_NO);
send(({ IAC, WONT, option }));
ok = 1;
break;
case WANT_NO:
if (Q_LOCALQ(state) == Q_EMPTY) {
// ignore, request sent already
} else {
state = S_LOCALQ(state, Q_EMPTY);
ok = 1;
}
break;
case WANT_YES:
if (Q_LOCALQ(state) == Q_EMPTY) {
state = S_LOCALQ(state, Q_OPPOSITE);
ok = 1;
} else {
// ignore, request sent already
}
break;
}
break;
}
ts[option, TS_STATE] = state;
return ok;
}
// Request information on an option. sb has to be called by reference.
public int query_telnet(int option, mixed sb) {
if (!intp(option) || option < 0 || !member(ts, option)) {
sb = 0;
return 0;
}
sb = copy(ts[option, TS_SB]);
return ts[option, TS_STATE];
}
// Got telnet negotations from the driver
void got_telnet(int command, int option, int *optargs) {
int state, i, j, c, l, *xx, full;
mixed agree;
string log;
// Set the hook as follows.
// set_driver_hook(H_TELNET_NEG, "got_telnet");
// Make shure it's a driver apply. Hope this never breaks ;)
if (caller_stack_depth()) return;
log = ts[TS_EXTRA, TSE_LOG];
if (strlen(log) > 4000) log = "..." + log[<3800..];
log += "got " + telnet_to_text(command, option, optargs) + "\n";
ts[TS_EXTRA, TSE_LOG] = log;
state = ts[option, TS_STATE];
switch (command) {
case WILL:
switch (Q_REMOTE(state)) {
case NO:
agree = ts[option, TS_R_AGREE];
if (closurep(agree)) agree = funcall(agree, command, option);
if (agree) {
state = S_REMOTE(state, YES);
ts[option, TS_STATE] = state;
send(({ IAC, DO, option }));
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
} else {
send(({ IAC, DONT, option }));
}
break;
case YES:
break; // ignore
case WANT_NO:
if (Q_REMOTEQ(state) == Q_EMPTY) {
tel_error("DONT answered by WILL");
state = S_REMOTE(state, NO);
} else {
tel_error("DONT answered by WILL");
state = S_REMOTE(state, YES);
state = S_REMOTEQ(state, Q_EMPTY);
}
ts[option, TS_STATE] = state;
break;
case WANT_YES:
state = S_REMOTE(state, YES);
ts[option, TS_STATE] = state;
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
if (Q_REMOTEQ(state) != Q_EMPTY) {
state = S_REMOTE(state, WANT_NO);
state = S_REMOTEQ(state, Q_EMPTY);
ts[option, TS_STATE] = state;
send(({ IAC, DONT, option }));
}
break;
}
break;
case WONT:
switch (Q_REMOTE(state)) {
case NO:
break; // ignore
case YES:
state = S_REMOTE(state, NO);
ts[option, TS_STATE] = state;
send(({ IAC, DONT, option }));
agree = ts[option, TS_CB];
if (closurep(agree)) agree = funcall(agree, command, option);
break;
case WANT_NO:
state = S_REMOTE(state, NO);
ts[option, TS_STATE] = state;
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
if (Q_REMOTEQ(state) != Q_EMPTY) {
state = S_REMOTE(state, WANT_YES);
state = S_REMOTEQ(state, Q_EMPTY);
ts[option, TS_STATE] = state;
send(({ IAC, DO, option }));
}
break;
case WANT_YES:
if (option == TELOPT_TM) {
// *sigh* TM is not as all other options are
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
}
else state = S_REMOTER(state, REJECTED);
state = S_REMOTE(state, NO);
state = S_REMOTEQ(state, Q_EMPTY);
ts[option, TS_STATE] = state;
break;
}
break;
case DO:
switch (Q_LOCAL(state)) {
case NO:
agree = ts[option, TS_L_AGREE];
if (closurep(agree)) agree = funcall(agree, command, option);
if (agree) {
state = S_LOCAL(state, YES);
ts[option, TS_STATE] = state;
send(({ IAC, WILL, option }));
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
} else {
send(({ IAC, WONT, option }));
}
break;
case YES:
break; // ignore
case WANT_NO:
if (Q_LOCALQ(state) == Q_EMPTY) {
tel_error("WONT answered by DO");
state = S_LOCAL(state, NO);
} else {
tel_error("WONT answered by DO");
state = S_LOCAL(state, YES);
state = S_LOCALQ(state, Q_EMPTY);
}
ts[option, TS_STATE] = state;
break;
case WANT_YES:
state = S_LOCAL(state, YES);
ts[option, TS_STATE] = state;
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
if (Q_LOCALQ(state) != Q_EMPTY) {
state = S_LOCAL(state, WANT_NO);
state = S_LOCALQ(state, Q_EMPTY);
ts[option, TS_STATE] = state;
send(({ IAC, WONT, option }));
}
break;
}
break;
case DONT:
switch (Q_LOCAL(state)) {
case NO:
break; // ignore
case YES:
state = S_LOCAL(state, NO);
ts[option, TS_STATE] = state;
send(({ IAC, WONT, option }));
agree = ts[option, TS_CB];
if (closurep(agree)) agree = funcall(agree, command, option);
break;
case WANT_NO:
state = S_LOCAL(state, NO);
ts[option, TS_STATE] = state;
agree = ts[option, TS_CB];
if (closurep(agree)) funcall(agree, command, option);
if (Q_LOCALQ(state) != Q_EMPTY) {
state = S_LOCAL(state, WANT_YES);
state = S_LOCALQ(state, Q_EMPTY);
ts[option, TS_STATE] = state;
send(({ IAC, WILL, option }));
}
break;
case WANT_YES:
state = S_LOCAL(state, NO);
state = S_LOCALQ(state, Q_EMPTY);
state = S_LOCALR(state, REJECTED);
ts[option, TS_STATE] = state;
break;
}
break;
case SB:
agree = ts[option, TS_SBCB];
if (closurep(agree)) funcall(agree, command, option, optargs);
break;
}
// Do full negotation only if client can telnetneg, means we got some
// telnetneg message from it. If we never got one we assume it can't
// do it. The negotiation is triggered by one single telnetneg request
// in the login process.
if (!ts[TS_EXTRA, TSE_TELNETNEG]) start_telnetneg();
}
// This function is used to transfer the telnet state engine's state
// from one object to an other, used for player renew and so on
//
// The transfer has to be done before the exec(E), so that both objects
// work with the same copy of ts
mapping transfer_ts(mapping old_ts) {
int opt;
if (!previous_object() || getuid(previous_object()) != ROOTID) return 0;
if (!old_ts) return ts;
// use callbacks of THIS object
foreach (opt : ts) {
if (opt < 0) continue;
old_ts[opt, TS_R_AGREE] = ts[opt, TS_R_AGREE];
old_ts[opt, TS_L_AGREE] = ts[opt, TS_L_AGREE];
old_ts[opt, TS_CB] = ts[opt, TS_CB];
old_ts[opt, TS_SBCB] = ts[opt, TS_SBCB];
}
ts = old_ts;
return 0;
}
// All telnet negotations are sent through this function
private int send(int* x) {
string log;
int *y, i, j;
if (x[1] != SB) y = x[3..];
else {
y = x[3..<3];
j = sizeof(y) - 1;
for (i = 0; i < j; ++i) { // undo 0xff quoting
if (y[i] == IAC && y[i+1] == 0xff) {
y[i..i+1] = ({ 0xff });
--j;
}
}
}
log = ts[TS_EXTRA, TSE_LOG];
if (strlen(log) > 4000) log = "..." + log[<3800..];
log += "sent " + telnet_to_text(x[1], x[2], y) +"\n";
ts[TS_EXTRA, TSE_LOG] = log;
return efun::binary_message(x);
}
// TODO: it's not quite complete
private string telnet_to_text(int command, int option, int* args) {
string d_txt;
int i, j;
d_txt = TELCMD2STRING(IAC) + " " +
TELCMD2STRING(command) + " " + TELOPT2STRING(option);
if (args && sizeof(args)) {
if (command == SB && option == TELOPT_LINEMODE) {
switch (args[0]) {
case LM_MODE:
if (sizeof(args) > 1) {
d_txt += " MODE" +
(args[1] & MODE_EDIT ? " EDIT" : " NOEDIT") +
(args[1] & MODE_TRAPSIG ? " TRAPSIG" : "") +
(args[1] & MODE_SOFT_TAB ? " SOFT_TAB" : "") +
(args[1] & MODE_LIT_ECHO ? " LIT_ECHO" : "") +
(args[1] & MODE_ACK ? " ACK" : "");
if (sizeof(args) == 2) return d_txt;
args = args[2..];
}
break;
case WILL: case WONT: case DO: case DONT:
d_txt += " " + TELCMD2STRING(args[0]);
args = args[1..];
if (sizeof(args) > 0 && args[0] == LM_FORWARDMASK) {
d_txt += " FORWARDMASK";
args = args[1..];
}
break;
case LM_SLC:
j = sizeof(args) - 2;
d_txt += " SLC";
for (i = 1; i < j; i += 3) {
d_txt += "\n ";
d_txt += sprintf("%-6s %-23s %02x",
SLC2STRING(args[i]),
SLC_FLAGNAME[args[i+1] & SLC_LEVELBITS] +
(args[i+1] & SLC_FLUSHOUT ? " FOUT" : "") +
(args[i+1] & SLC_FLUSHIN ? " FIN" : "") +
(args[i+1] & SLC_ACK ? " ACK" : ""),
args[i+2]);
}
if (i > j) return d_txt;
args = args[i-3..]; // dump rest (is error)
break;
}
}
if (command == SB && option != TELOPT_NAWS && option != TELOPT_LINEMODE) {
d_txt += " " + TELQUAL2STRING(args[0]);
if (sizeof(args) > 1) d_txt += " (" +
implode(map(args[1..], (: sprintf("%02x", $1) :)), ",") + ")";
}
else if (sizeof(args)) d_txt +=
" (" + implode(map(args, (: sprintf("%02x", $1) :)), ",") + ")";
}
return d_txt;
}
// Full negotiation tries to set all our preferences
// Options with closures as preference are not actively enabled.
private void start_telnetneg() {
int opt, *options;
ts[TS_EXTRA, TSE_TELNETNEG] = 1;
options = m_indices(ts) - ({ TS_EXTRA });
foreach (opt : options) {
if (ts[opt, TS_R_AGREE] == 1) set_telnet(DO, opt);
if (ts[opt, TS_L_AGREE] == 1) set_telnet(WILL, opt);
}
}
// Telnet protocoll violations end up here
private void tel_error(string err) {
string log;
log = ts[TS_EXTRA, TSE_LOG];
if (strlen(log) > 4000) log = "..." + log[<3800..];
log += "ERR " + err + "\n";
ts[TS_EXTRA, TSE_LOG] = log;
}
// ******************** Telnet Server Engine ********************
//
// The following code is the telnet server using the telnet state machine.
// It has to follow the some basic rules that cannot be assured by the
// state machine to be complient to RFC 854. The most important is to
// enable only options which are fully implemented.
//
// State changes are requested by the driver with the H_NOECHO hook
// and set_noecho().
//
// Here is defined how the mud will act in the negotiation.
nosave int* tm_t;
void create() {
if (!ts) {
ts = m_allocate(7, TS_SIZE);
ts[TS_EXTRA, TSE_LOG] = "";
}
// set how we would like the options' states
set_callback(TELOPT_NAWS, DO, WONT, 0, #'sb_naws);
set_callback(TELOPT_STATUS , DONT, WILL, 0, #'sb_status);
set_callback(TELOPT_TTYPE, DO, WONT, #'start_sb, #'sb_ttype);
set_callback(TELOPT_TSPEED, DO, WONT, #'start_sb, #'sb_tspeed);
set_callback(TELOPT_NEWENV, DO, WONT, #'start_sb, #'sb_env);
set_callback(TELOPT_ENVIRON, DO, WONT, #'start_sb, #'sb_env);
set_callback(TELOPT_XDISPLOC, DO, WONT, #'start_sb, #'sb_xdisp);
set_callback(TELOPT_EOR, DONT, WILL, #'start_eor, 0);
set_callback(TELOPT_LINEMODE, DO, WONT, #'start_lm, #'sb_line);
set_callback(TELOPT_TM , #'neg_tm, #'neg_tm, #'neg_tm, 0);
set_callback(TELOPT_BINARY, #'neg_bin, #'neg_bin, 0, 0);
set_callback(TELOPT_SGA, #'neg_sga, #'neg_sga, #'cb_sga, 0);
set_callback(TELOPT_ECHO, #'neg_echo, WONT, #'cb_echo, 0);
}
// Change the NOECHO and CHARMODE state, called indirectly thru input_to()
void set_noecho(int flag) {
// Security check needs H_NOECHO to be specified as follows,
// with lfun in the master:
//
// set_driver_hook(H_NOECHO, #'noecho_hook);
//
// void noecho_hook(int flag, int ob) {
// if (ob) ob->set_noecho(flag);
// }
int i, j;
if (object_name(previous_object()) != __MASTER_OBJECT__) return;
if (!ts[TS_EXTRA, TSE_TELNETNEG]) return; // client does not telnetneg
flag &= 255;
i = Q_TSE_NOECHO;
// Check if a change in NOECHO is requested
if (flag & INPUT_NOECHO) {
if (i == NO || i == WANT_NO) {
S_TSE_NOECHO(WANT_YES);
// If CHARMODE and NOECHO are requested (as usual), enter NOECHO
// only if we could enter CHARMODE, else the player would be blind.
if (!(flag & INPUT_CHARMODE)) {
ts[TS_EXTRA, TSE_LOG] += "* trying to get NOECHO\n";
set_telnet(WILL, TELOPT_ECHO);
}
}
} else {
if (i == YES || i == WANT_YES) {
ts[TS_EXTRA, TSE_LOG] += "* trying to leave NOECHO\n";
S_TSE_NOECHO(WANT_NO);
set_telnet(WONT, TELOPT_ECHO);
}
}
i = Q_TSE_SGA_CHAR;
j = Q_TSE_LM_CHAR;
// Check if a change in CHARMODE is requested
// When the client knows LINEMODE, use it. If not use old (sga) charmode.
if (flag & INPUT_CHARMODE) {
if (i != YES && j != YES && i != WANT_YES && j != WANT_YES) {
ts[TS_EXTRA, TSE_LOG] += "* trying to get CHARMODE\n";
if (Q_REMOTE(ts[TELOPT_LINEMODE, TS_STATE] == YES)) {
S_TSE_LM_CHAR(WANT_YES);
send(({ IAC, SB, TELOPT_LINEMODE, LM_MODE,
MODE_SOFT_TAB | MODE_LIT_ECHO, IAC, SE }));
} else {
S_TSE_SGA_CHAR(WANT_YES);
set_telnet(WILL, TELOPT_SGA);
set_telnet(DO, TELOPT_SGA);
}
}
} else {
if (i == YES || j == YES || i == WANT_YES || j == WANT_YES) {
ts[TS_EXTRA, TSE_LOG] += "* trying to leave CHARMODE\n";
// check both flags independently
if (j == YES || j == WANT_YES) {
S_TSE_LM_CHAR(WANT_NO);
send(({ IAC, SB, TELOPT_LINEMODE, LM_MODE,
MODE_EDIT | MODE_SOFT_TAB | MODE_LIT_ECHO, IAC, SE }));
}
if (i == YES || i == WANT_YES) {
S_TSE_SGA_CHAR(WANT_NO);
set_telnet(WONT, TELOPT_SGA);
set_telnet(DONT, TELOPT_SGA);
}
}
}
}
//
// The callback functions
//
// neg_*() are called to decide if we say 'no' or 'yes' to an incoming
// option change request
private int neg_sga(int command, int option) {
// Remote SGA is allowed for old charmode.
// Local SGA is allowed for noecho mode (due to the SGA/ECHO ambiguity,
// see RFC 857). It is also allowed if we are in old charmode
// because some clients think it's needed.
int i;
if (command == DO) {
i = Q_TSE_NOECHO;
if (i == WANT_YES || i == YES) return 1;
}
// else WILL
i = Q_TSE_SGA_CHAR;
if (i == WANT_YES || i == YES) return 1;
return 0;
}
private int neg_echo(int command, int option) {
// Remote ECHO is never allowed (why should we like to get our own text)
// Local ECHO is allowed for noecho mode
// only called for DO
int i;
i = Q_TSE_NOECHO;
if (i == WANT_YES || i == YES) return 1;
return 0;
}
private int neg_bin(int command, int option) {
// We like to have it enabled, but we don't want to have it enabled
// with start_telnetneg().
// BINARY actively enabled only it the TTYPE is "xterm".
// Some clients cant even answer a BINARY request properly (they have
// to embed a '\0' into the stream). The RFC says, that it is needed
// for 8 bit data path. Most clients just use this anyway and send
// for example german umlauts. Strictly it's forbidden, though. Some
// clients (BSD telnet for example) do honor this state and need
// BINARY to send umlauts.
return 1;
}
private int neg_tm(int command, int option) {
int *t, i;
// reset state immediately
if (command == DO || command == DONT) {
i = ts[option, TS_STATE];
i = S_LOCAL(i, NO);
i = S_REMOTE(i, NO);
i = S_REMOTER(i, 0);
ts[option, TS_STATE] = i;
}
if (command == WILL || command == WONT) {
i = ts[option, TS_STATE];
i = S_LOCAL(i, NO);
i = S_REMOTE(i, NO);
i = S_REMOTER(i, 0);
ts[option, TS_STATE] = i;
// got an answer
t = utime();
i = (t[0]-tm_t[0])*1000 + (t[1]-tm_t[1])/1000;
tm_t = 0;
i -= 11; // interne Verzoegerung (muss man messen!)
if (i < 1) i = 1;
tell_object(this_object(), "Hurrikap teilt Dir mit: "
"Daten benoetigen von Dir zum Mud und zurueck "+i+" ms.\n");
}
return 1;
}
// start_*() and cb_*() are called on/after succesfull option changes
// We do the appropriate things then.
private void start_sb(int command, int option) {
// If we got a WILL, request subnegotiation
if (command == WILL) send(({ IAC, SB, option, TELQUAL_SEND, IAC, SE }));
}
private void start_lm(int command, int option) {
if (command != WILL) return;
if (!ts[option, TS_SB]) ts[option, TS_SB] = allocate(LM_SLC+1);
send(({ IAC, SB, TELOPT_LINEMODE, LM_MODE,
MODE_EDIT | MODE_SOFT_TAB | MODE_LIT_ECHO, IAC, SE }));
ts[option, TS_SB][LM_MODE] = MODE_EDIT | MODE_SOFT_TAB | MODE_LIT_ECHO;
// Flush on every control character
// remember to prepend 0xff with IACs
send(({ IAC, SB, TELOPT_LINEMODE, DO,
LM_FORWARDMASK, IAC, 0xff, IAC, 0xff, IAC, 0xff, IAC, 0xff, IAC, SE }));
ts[option, TS_SB][LM_FORWARDMASK] = WANT_YES;
}
private void start_eor(int command, int option) {
// If we are allowed to use EOR whilst displaying a possible prompt
// line, mark is as such. This happens unually only at the login.
if (command == DO) efun::binary_message(({ IAC, EOR }));
// Adjust prompt method to appropriate function
if (command == DO || command == DONT) modify_prompt();
}
private void cb_sga(int command, int option) {
switch (command) {
case WILL:
if (Q_TSE_SGA_CHAR == WANT_YES) {
S_TSE_SGA_CHAR(YES);
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE established\n";
if (Q_TSE_NOECHO == WANT_YES) {
ts[TS_EXTRA, TSE_LOG] += "* trying to get NOECHO\n";
set_telnet(WILL, TELOPT_ECHO);
}
}
break;
case WONT:
switch (Q_TSE_SGA_CHAR) {
case WANT_NO:
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE left\n"; break;
case WANT_YES:
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE denied\n"; break;
case YES:
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE forcefully left\n"; break;
}
S_TSE_SGA_CHAR(NO);
break;
}
}
private void cb_echo(int command, int option) {
switch (command) {
case DO:
if (Q_TSE_NOECHO == WANT_YES) {
S_TSE_NOECHO(YES);
ts[TS_EXTRA, TSE_LOG] += "* NOECHO established\n";
}
break;
case DONT:
switch (Q_TSE_NOECHO) {
case WANT_NO:
ts[TS_EXTRA, TSE_LOG] += "* NOECHO mode left\n"; break;
case WANT_YES:
ts[TS_EXTRA, TSE_LOG] += "* NOECHO denied\n"; break;
case YES:
ts[TS_EXTRA, TSE_LOG] += "* NOECHO forcefully left\n"; break;
}
S_TSE_NOECHO(NO);
break;
}
}
// sb_*() handle the different incoming subnegotiations
private void sb_status(int command, int option, int* optargs) {
int *ret, opt, state, s, end;
if (sizeof(optargs) != 1) return;
if (optargs[0] != TELQUAL_SEND) return;
ret = ({});
foreach (opt : ts) {
if (opt < 0) continue;
state = ts[opt, TS_STATE];
s = Q_LOCAL(state);
if (s == YES || s == WANT_NO) ret += ({ WILL, opt });
s = Q_REMOTE(state);
if (s == YES || s == WANT_NO) ret += ({ DO, opt });
}
// some driver include the string end '\0'
end = sizeof(to_array("")) + 1;
if (ts[TELOPT_TSPEED, TS_SB])
ret += ({ SB, TELOPT_TSPEED, TELQUAL_IS }) +
to_array(ts[TELOPT_TSPEED, TS_SB][0]+","+
ts[TELOPT_TSPEED, TS_SB][1])[0..<end] + ({ -SE });
if (ts[TELOPT_XDISPLOC, TS_SB])
ret += ({ SB, TELOPT_XDISPLOC, TELQUAL_IS }) +
to_array(ts[TELOPT_XDISPLOC, TS_SB])[0..<end] + ({ -SE });
if (ts[TELOPT_TTYPE, TS_SB])
ret += ({ SB, TELOPT_TTYPE, TELQUAL_IS }) +
to_array(ts[TELOPT_TTYPE, TS_SB][1][0])[0..<end] + ({ -SE });
if (ts[TELOPT_NAWS, TS_SB])
ret += ({ SB, TELOPT_NAWS, ts[TELOPT_NAWS, TS_SB][0]/0x100,
ts[TELOPT_NAWS, TS_SB][0]%0x100,
ts[TELOPT_NAWS, TS_SB][1]/0x100,
ts[TELOPT_NAWS, TS_SB][1]%0x100, -SE });
if (ts[TELOPT_LINEMODE, TS_SB]) {
ret += ({ SB, TELOPT_LINEMODE, LM_MODE,
ts[TELOPT_LINEMODE, TS_SB][LM_MODE], -SE });
if (ts[TELOPT_LINEMODE, TS_SB][LM_FORWARDMASK] == YES)
ret += ({ SB, TELOPT_LINEMODE, DO, LM_FORWARDMASK, 0, 0x24, -SE });
if (sizeof(ts[TELOPT_LINEMODE, TS_SB][LM_SLC])) {
ret += ({ SB, TELOPT_LINEMODE, LM_SLC });
foreach (int i, int j, int k : ts[TELOPT_LINEMODE, TS_SB][LM_SLC])
ret += ({ i, j, k });
ret += ({ -SE });
}
}
// We dont send SB ENVIRON or SB NEWENV
// quote IAC and SE
// we use -SE for unquotable SEs
for (s = sizeof(ret); s--;) {
if (ret[s] == IAC) ret[s..s] = ({ IAC, IAC });
if (ret[s] == SE) ret[s..s] = ({ SE, SE });
if (ret[s] == -SE) ret[s] = SE;
}
send(({ IAC, SB, option, TELQUAL_IS }) + ret + ({ IAC, SE }));
}
private void sb_naws(int command, int option, int* optargs) {
int cols, lines, *old;
if (sizeof(optargs) != 4) return tel_error("SB NAWS with wrong size");
cols = optargs[1] + optargs[0] * 256;
lines = optargs[3] + optargs[2] * 256;
old = ts[option, TS_SB];
ts[option, TS_SB] = ({ cols, lines });
ts[TS_EXTRA, TSE_LOG] +=
" Window size: " + cols + " cols, " + lines + " lines\n";
// inform mudlib
if (pointerp(old)) {
if (old[0] != cols) SetProp(P_TTY_COLS, cols);
if (old[1] != lines) SetProp(P_TTY_ROWS, lines);
}
}
private void sb_xdisp(int command, int option, int* optargs) {
string value;
int len;
if (sizeof(optargs) < 2) return;
if (optargs[0] != TELQUAL_IS) return;
value = to_string(filter(optargs[1..], (: $1 >= ' ' && $1 <= '~' :)));
len = strlen(value);
if (strlen(value) != sizeof(optargs)-1)
tel_error("SB XDISPLOC contained bad characters");
if (!len)
return tel_error("SB XDISPLOC empty, ignoring");
ts[option, TS_SB] = value;
ts[TS_EXTRA, TSE_LOG] += " XDISPLOC is " + value + "\n";
}
private void sb_ttype(int command, int option, int* optargs) {
string value;
int len, i;
mixed* all;
if (sizeof(optargs) < 2) return;
if (optargs[0] != TELQUAL_IS) return;
value = to_string(filter(optargs[1..], (: $1 >= ' ' && $1 <= '~' :)));
len = strlen(value);
if (strlen(value) != sizeof(optargs)-1)
tel_error("SB TTYPE contained bad characters");
if (!len)
return tel_error("SB TTYPE empty, ignoring");
value = lower_case(value);
ts[TS_EXTRA, TSE_LOG] += " TTYPE is " + value + "\n";
all = ts[option, TS_SB];
if (!all) {
all = ({ 0, ({}) });
// inform mudlib
SetProp(P_TTY_TYPE, value);
}
#ifdef GET_ALL_TTYPES
// Clients may provide different terminal types which are synonyms to
// the native one (RFC 930). It is also possible to have a client which
// switches terminal emulation along with the given (non synonymous)
// terminal type names (RFC 1091). All these types are collected if
// GET_ALL_TTYPES is defined.
//
// The drawback is, that the cycling thru all terminal emulations takes
// some time, especially on slow links. MS windows 2000's and XP's
// telnet have an emulation with key on-off sequences rather that chars.
// Commands typed while TTYPE is negotiated may be wrong with that clients.
i = member(all[1], value);
if (i < 0) {
all[1] += ({ value });
// get next TTYPE
if (Q_REMOTE(ts[option, TS_STATE]) == YES) start_sb(WILL, option);
} else {
// switch back to first
if (i == 0) {
// ok, initial type re-established
ts[TS_EXTRA, TSE_LOG] += " TTYPE in client set\n";
return;
}
switch (++all[0]) {
case 1:
if (Q_REMOTE(ts[option, TS_STATE]) == YES) start_sb(WILL, option);
break; // just retry
case 2:
tel_error("could not get initial TTYPE, may be rfc930 client");
if (value != "vtnt") break;
tel_error("trying trick to restart TTYPE list on windows client");
set_telnet(DONT, TELOPT_TTYPE);
set_telnet(DO, TELOPT_TTYPE);
break;
case 3:
tel_error("giving up on TTYPE");
break;
}
}
#endif
ts[option, TS_SB] = all;
// Some clients cannot answer BINARY correctly. Xterm should be
// able to. Also most clients ignore this option and just use a 8 bit
// data path; only BSD telnet is known to need BINARY in order to
// send umlauts.
if (lower_case(value) == "xterm")
set_telnet(DO, TELOPT_BINARY);
}
private void sb_tspeed(int command, int option, int* optargs) {
int i, j, os;
os = sizeof(optargs);
if (os < 2) return;
if (optargs[0] != TELQUAL_IS) return;
for (i = 1; i < os; ++i) {
if (optargs[i]==',') break;
if (optargs[i] < '0' || optargs[i] > '9')
return tel_error("SB TSPEED invalid character");
}
if (i == 1) return tel_error("SB TSPEED empty transmit speed");
if (i == os) return tel_error("SB TSPEED no comma found");
for (j = i+1; j < os; ++j) {
if (optargs[j] < '0' || optargs[j] > '9')
return tel_error("SB TSPEED invalid character");
}
if (i+1 >= os) return tel_error("SB TSPEED empty receive speed");
ts[option, TS_SB] = ({ to_int(to_string(optargs[1..i-1])),
to_int(to_string(optargs[i+1..])) });
ts[TS_EXTRA, TSE_LOG] +=
" Transmit speed " + ts[option, TS_SB][0] +
", receive speed " + ts[option, TS_SB][1] + "\n";
}
private void sb_env(int command, int option, int* optargs) {
int i, j, os;
mixed mix;
mapping env;
string s;
os = sizeof(optargs);
if (os < 2) return;
if (optargs[0] != TELQUAL_IS && optargs[0] != TELQUAL_INFO) return;
mix = ({});
for (i = j = 1; j < os; ++j) {
if (optargs[j] == ENV_ESC) {
++j;
continue;
}
if (optargs[j] <= ENV_USERVAR) {
if (i != j) {
s = to_string(filter(optargs[i..j-1], #'>=, ' '));
if (strlen(s) != j-i)
tel_error("SB ENV contained bad characters");
mix += ({ s });
}
mix += ({ optargs[j] });
i = j + 1;
continue;
}
}
if (i < j-1) {
s = to_string(filter(optargs[i..j-1], #'>=, ' '));
if (strlen(s) != j-i)
tel_error("SB ENV contained bad characters");
mix += ({ s });
}
// Due to some weird implementation mistakes (see RFC 1571)
// we can't be shure if VALUE or VAR are valid or swapped.
// So we don't distuingush VAR and USERVAR and assume that every
// variable's name is followed by its value.
s = 0;
env = ([]);
os = sizeof(mix);
for (i = 0; i < os; ++i) {
if (!s && stringp(mix[i])) s = mix[i];
else if (s) {
if (stringp(mix[i])) {
env[s] = mix[i];
s = 0;
} else if (!stringp(mix[i-1])) {
env[s] = 1; // defined but no value assigned
s = 0;
}
}
}
ts[option, TS_SB] = env;
foreach (s, mix : env) {
ts[TS_EXTRA, TSE_LOG] += " Environment " + s +" => " +
(stringp(mix) ? mix : "defined") + "\n";
}
}
private void sb_line(int command, int option, int* optargs) {
// Maybe LINEMODE should be turned of on errors, but then... I never saw any.
int state, *xx, i, j;
if (!ts[option, TS_SB]) ts[option, TS_SB] = allocate(LM_SLC+1);
if (sizeof(optargs) < 2) return;
switch (optargs[0]) {
case LM_MODE:
if (!(optargs[1] & MODE_ACK))
return tel_error("SB LINEMODE MODE with no ACK set (ignoring)");
if (optargs[1] & MODE_EDIT) switch (Q_TSE_LM_CHAR) {
case YES:
return tel_error("SB LINEMODE MODE EDIT unexpected");
case WANT_YES:
return tel_error("SB LINEMODE MODE EDIT invalid answer");
case WANT_NO:
S_TSE_LM_CHAR(NO);
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE left\n";
break;
}
else switch (Q_TSE_LM_CHAR) {
case NO:
return tel_error("SB LINEMODE MODE EDIT unexpected");
case WANT_NO:
return tel_error("SB LINEMODE MODE EDIT invalid answer");
case WANT_YES:
S_TSE_LM_CHAR(YES);
ts[TS_EXTRA, TSE_LOG] += "* CHARMODE established\n";
if (Q_TSE_NOECHO == WANT_YES) {
ts[TS_EXTRA, TSE_LOG] += "* trying to get NOECHO\n";
set_telnet(WILL, TELOPT_ECHO);
}
break;
}
ts[option, TS_SB][LM_MODE] = optargs[1] & ~MODE_ACK;
break;
// server does not use forwardmask
case DO:
case DONT:
if (optargs[1] != LM_FORWARDMASK) {
return tel_error("SB LINEMODE " + TELCMD2STRING(optargs[0]) +
sprintf(" %02x unknown (ignored)", optargs[1]));
}
return tel_error("SB LINEMODE DO/DONT FORWARDMASK not "
"allowed for client");
return;
// client is requested to use forwardmask
case WILL:
if (optargs[1] != LM_FORWARDMASK) {
return tel_error("SB LINEMODE " + TELCMD2STRING(optargs[0]) +
sprintf(" %02x unknown (ignored)", optargs[1]));
}
state = ts[option, TS_SB][LM_FORWARDMASK];
switch (state) {
case NO:
tel_error("got spontan WILL FORWARDMASK (denied)");
break;
case YES:
// is already set, ignore
break;
case WANT_NO:
tel_error("got WILL on DONT");
break;
case WANT_YES:
ts[option, TS_SB][LM_FORWARDMASK] = YES;
break;
}
return;
case WONT:
if (optargs[1] != LM_FORWARDMASK) {
return tel_error("SB LINEMODE " + TELCMD2STRING(optargs[0]) +
sprintf(" %02x unknown (ignored)", optargs[1]));
}
state = ts[option, TS_SB][LM_FORWARDMASK];
switch (state) {
case YES:
send(({ IAC, SB, option, DONT, LM_FORWARDMASK, IAC, SE }));
ts[option, TS_SB][LM_FORWARDMASK] = NO;
break;
case NO:
// is already set, ignore
break;
case WANT_YES:
case WANT_NO:
ts[option, TS_SB][LM_FORWARDMASK] = NO;
break;
}
return;
case LM_SLC:
if (sizeof(optargs) < 4) return tel_error("SB too short");
if (!ts[option, TS_SB][LM_SLC]) ts[option, TS_SB][LM_SLC] = ([ :2 ]);
xx = ({ IAC, SB, TELOPT_LINEMODE, LM_SLC });
// Request for our preferences?
// All the rest (especially the cursor movement) we would like
// to be escape sequences, so no SLCs for that
if (optargs[1] == 0 && optargs[2] == SLC_DEFAULT && optargs[3] == 0) {
for (i = SLC_SYNCH; i <= SLC_SUSP; ++i)
xx += ({ i, SLC_NOSUPPORT, 0 });
xx += ({ SLC_EC, SLC_DEFAULT, 127,
SLC_EL, SLC_DEFAULT, 21,
SLC_EW, SLC_DEFAULT, 23,
SLC_XON, SLC_NOSUPPORT, 0,
SLC_XOFF, SLC_NOSUPPORT, 0,
SLC_FORW1, SLC_NOSUPPORT, 0,
SLC_FORW2, SLC_NOSUPPORT, 0, IAC, SE });
send(xx);
break;
}
// Answer to client's preferences
// We dont want any of the session control keys (Synch - Susp)
// Everything else is just acknoledged
optargs = optargs[1..];
j = sizeof(optargs) - 3;
for (i = 0; i < j; i+=3) {
if (optargs[i+1] & SLC_ACK) {
m_add(ts[option, TS_SB][LM_SLC], optargs[i],
optargs[i+1] & ~SLC_ACK, optargs[i+2]);
continue;
}
if (optargs[i+1] == SLC_NOSUPPORT) continue;
if (optargs[i] > SLC_SUSP) {
m_add(ts[option, TS_SB][LM_SLC], optargs[i],
optargs[i+1] & ~SLC_ACK, optargs[i+2]);
xx += ({ optargs[i], optargs[i+1] | SLC_ACK, optargs[i+2] });
} else
xx += ({ optargs[i], SLC_NOSUPPORT, 0 });
}
i = sizeof(xx);
if (i > 4) {
for (; --i;) if (xx[i] == 0xff) xx[i..i] = ({ IAC, 0xff });
send(xx + ({ IAC, SE }));
}
return;
}
}
// helper functions, called from mudlib
void send_telopt_tm() {
tm_t = utime();
set_telnet(DO, TELOPT_TM);
}
void _dumptelnegs() {
printf(ts[TS_EXTRA, TSE_LOG]);
}
Reference in a new issue View git blame Copy permalink