/*
* 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 proc_rec_opt(Telnet telnet, int cmd, int option)
{
const struct Opt *const *o;
log_option(telnet, "server", cmd, option);
for (o = opts; *o; o++) {
if ((*o)->option == option && (*o)->ack == cmd) {
switch (telnet->opt_states[(*o)->index]) {
case REQUESTED:
telnet->opt_states[(*o)->index] = ACTIVE;
activate_option(telnet, *o);
break;
case ACTIVE:
break;
case INACTIVE:
telnet->opt_states[(*o)->index] = ACTIVE;
send_opt(telnet, (*o)->send, option);
activate_option(telnet, *o);
break;
case REALLY_INACTIVE:
send_opt(telnet, (*o)->nsend, option);
break;
}
return;
} else if ((*o)->option == option && (*o)->nak == cmd) {
switch (telnet->opt_states[(*o)->index]) {
case REQUESTED:
telnet->opt_states[(*o)->index] = INACTIVE;
refused_option(telnet, *o);
break;
case ACTIVE:
telnet->opt_states[(*o)->index] = INACTIVE;
send_opt(telnet, (*o)->nsend, option);
option_side_effects(telnet, *o, 0);
break;
case INACTIVE:
case REALLY_INACTIVE:
break;
}
return;
}
}
/*
* If we reach here, the option was one we weren't prepared to
* cope with. If the request was positive (WILL or DO), we send
* a negative ack to indicate refusal. If the request was
* negative (WONT / DONT), we must do nothing.
*/
if (cmd == WILL || cmd == DO)
send_opt(telnet, (cmd == WILL ? DONT : WONT), option);
}
static void 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 refused_option(Telnet telnet, const struct Opt *o)
{
if (o->send == WILL && o->option == TELOPT_NEW_ENVIRON &&
telnet->opt_states[o_oenv.index] == INACTIVE) {
send_opt(telnet, WILL, TELOPT_OLD_ENVIRON);
telnet->opt_states[o_oenv.index] = REQUESTED;
}
option_side_effects(telnet, o, 0);
}
static void proc_rec_opt (int cmd, int option) {
struct Opt **o;
for (o = opts; *o; o++) {
if ((*o)->option == option && (*o)->ack == cmd) {
switch ((*o)->state) {
case REQUESTED:
(*o)->state = ACTIVE;
break;
case ACTIVE:
break;
case INACTIVE:
(*o)->state = ACTIVE;
send_opt ((*o)->send, option);
break;
}
return;
} else if ((*o)->option == option && (*o)->nak == cmd) {
switch ((*o)->state) {
case REQUESTED:
(*o)->state = INACTIVE;
break;
case ACTIVE:
(*o)->state = INACTIVE;
send_opt ((*o)->nsend, option);
break;
case INACTIVE:
break;
}
return;
}
}
/*
* If we reach here, the option was one we weren't prepared to
* cope with. So send a negative ack.
*/
send_opt ((cmd == WILL ? DONT : WONT), option);
}
static void do_telnet_init (void) {
struct Opt **o;
/*
* Initialise option states.
*/
for (o = opts; *o; o++)
if ((*o)->state == REQUESTED)
send_opt ((*o)->send, (*o)->option);
/*
* Set up SYNCH state.
*/
in_synch = FALSE;
}