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comm1.c
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#include <sys/types.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <fcntl.h>
#include <stdarg.h>
#include <arpa/telnet.h>
#include <netdb.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <signal.h>
#include <memory.h>
#include <fcntl.h>
#include <stdlib.h>
#include "config.h"
#include "lint.h"
#include "mstring.h"
#include "interpret.h"
#include "comm.h"
#include "object.h"
#include "sent.h"
#include "simulate.h"
#include "super_snoop.h"
#include "ndesc.h"
#include "hname.h"
#include "nqueue.h"
#include "telnet.h"
#include "tcpsvc.h"
#include "udpsvc.h"
#include "main.h"
#include "backend.h"
#include "mapping.h"
#include "json.h"
#include "inline_svalue.h"
#include "comm1.h"
void set_prompt (char *);
void prepare_ipc (void);
void ipc_remove (void);
char *query_ip_number (struct object *);
char *query_port_number (struct object *);
char *query_host_name (void);
extern char *string_copy(char *);
extern int d_flag;
extern int s_flag;
extern int no_ip_demon;
void remove_interactive(struct interactive *, int), add_ref(struct object *, char *);
struct interactive *all_players[MAX_PLAYERS];
extern struct object *current_interactive;
extern struct object *previous_ob;
#ifdef CATCH_UDP_PORT
extern int udp_port;
udpsvc_t *udpsvc;
#endif /* CATCH_UDP_PORT */
void *new_player(void *, struct sockaddr_storage *, socklen_t, u_short local_port);
int num_player;
/*
* Interprocess communication interface to the backend.
*/
extern int port_number;
#ifndef NO_IP_DEMON
static void *hname;
static void
shutdown_hname(void *hp)
{
hname = NULL;
}
static void
receive_hname(const char *addr, int lport, int rport,
const char *ip_name, const char *rname)
{
int i;
struct interactive *ip;
if (addr == NULL || rname == NULL)
return;
for (i = 0; i < MAX_PLAYERS; i++)
{
ip = all_players[i];
if (ip == NULL)
continue;
const char *ip_number = query_ip_number(ip->ob);
if (ip_number != NULL && !strcmp(addr, query_ip_number(ip->ob)))
{
if (strlen(ip_name))
{
if (ip->host_name)
free(ip->host_name);
ip->host_name = xalloc(strlen(ip_name) + 1);
strcpy(ip->host_name, ip_name);
}
if (ip->lport == lport && atoi(query_port_number(ip->ob)) == rport && strlen(rname))
{
if (ip->rname != NULL)
free(ip->rname);
ip->rname = xalloc(strlen(rname) + 1);
strcpy(ip->rname, rname);
}
}
}
}
#endif
void
prepare_ipc()
{
nd_init();
#ifndef NO_IP_DEMON
if (!no_ip_demon)
hname = hname_init(receive_hname, shutdown_hname);
#endif
telnet_init((u_short)port_number);
#ifdef SERVICE_PORT
tcpsvc_init((u_short)service_port);
#endif /* SERVICE_PORT */
#ifdef CATCH_UDP_PORT
udpsvc = udpsvc_init(udp_port);
#endif /* CATCH_UDP_PORT */
(void)signal(SIGPIPE, SIG_IGN);
}
/*
* This one is called when shutting down the MUD.
*/
void
ipc_remove()
{
(void)printf("Shutting down ipc...\n");
nd_shutdown();
}
void write_socket(char *, struct object *);
/*
* Send a message to a player. If that player is shadowed, special
* care has to be taken.
*/
/*VARARGS1*/
void
add_message2(struct object *ob, char *fmt, ...)
{
char buff[10000];
va_list argp;
va_start(argp, fmt);
(void)vsnprintf(buff, sizeof(buff), fmt, argp);
/* LINTED: expression has null effect */
va_end(argp);
if (ob && !(ob->flags & O_DESTRUCTED))
{
push_string(buff, STRING_MSTRING);
(void)apply("catch_tell", ob, 1, 1);
}
else
write_socket(buff, (struct object *)0);
}
void
add_message(char *fmt, ...)
{
char buff[10000];
va_list argp;
va_start(argp, fmt);
(void)vsnprintf(buff, sizeof(buff), fmt, argp);
/* LINTED: expression has null effect */
va_end(argp);
if (command_giver && !(command_giver->flags & O_DESTRUCTED))
{
push_string(buff, STRING_MSTRING);
(void)apply("catch_tell", command_giver, 1, 1);
}
else
write_socket(buff, (struct object *)0);
}
/*
* Outputs GMCP data to the client
*/
void
write_gmcp(struct object *ob, char *data)
{
struct interactive *ip;
if (ob == NULL || ob->flags & O_DESTRUCTED ||
(ip = ob->interactive) == NULL || ip->do_close)
return;
telnet_output_gmcp(ip->tp, (u_char *)data);
}
/*
* Will output to telnet on every newline to avoid overflow.
*/
void
write_socket(char *cp, struct object *ob)
{
struct interactive *ip;
int telnet_overflow = 0, overflow = 0;
#ifdef WORD_WRAP
int len, current_column;
char *bp, buf[MAX_WRITE_SOCKET_SIZE + 2];
#endif
if (ob == NULL || ob->flags & O_DESTRUCTED ||
(ip = ob->interactive) == NULL ||
ip->do_close)
{
(void)fputs(cp, stderr);
(void)fflush(stderr);
return;
}
#ifdef SUPER_SNOOP
if (ip->snoop_fd != -1)
(void)write(ip->snoop_fd, cp, strlen(cp));
#endif
if (ip->snoop_by != NULL)
add_message2(ip->snoop_by->ob, "%%%s", cp);
#ifdef WORD_WRAP
if (ip->screen_width != 0)
{
current_column = ip->current_column;
bp = buf;
for (;;)
{
if (*cp == '\0')
break;
if (bp >= &buf[MAX_WRITE_SOCKET_SIZE])
{
bp = &buf[MAX_WRITE_SOCKET_SIZE];
overflow = 1;
break;
}
if (*cp == '\n')
{
current_column = 0;
*bp++ = *cp++;
*bp = '\0';
telnet_overflow = telnet_output(ip->tp, (u_char *)buf);
bp = buf;
if (telnet_overflow)
break;
continue;
}
if (*cp == '\t')
{
current_column &= ~7;
current_column += 8;
if (current_column >= ip->screen_width)
{
current_column = 0;
*bp++ = '\n';
*bp = '\0';
telnet_overflow = telnet_output(ip->tp, (u_char *)buf);
bp = buf;
if (telnet_overflow)
break;
while (*cp == ' ' || *cp == '\t')
cp++;
}
else
{
*bp++ = *cp++;
}
continue;
}
len = 1;
while (cp[len] > ' ' && cp[len - 1] != '-')
len++;
if (current_column + len >= ip->screen_width)
{
if (current_column > ip->screen_width * 4 / 5)
{
current_column = 0;
*bp++ = '\n';
*bp = '\0';
telnet_overflow = telnet_output(ip->tp, (u_char *)buf);
bp = buf;
if (telnet_overflow)
break;
while (*cp == ' ' || *cp == '\t')
cp++;
if (*cp == '\n')
cp++;
continue;
}
}
if (bp + len > &buf[MAX_WRITE_SOCKET_SIZE])
{
len = (&buf[MAX_WRITE_SOCKET_SIZE] - bp);
overflow = 1;
}
current_column += len;
for (; len > 0; len--)
*bp++ = *cp++;
}
ip->current_column = current_column;
*bp = '\0';
telnet_overflow |= telnet_output(ip->tp, (u_char *)buf);
if (overflow && !telnet_overflow)
telnet_output(ip->tp, (u_char *)"*** Truncated! ***\n");
}
else
#endif
{
telnet_output(ip->tp, (u_char *)cp);
/* No test on overflow. Let the telnet buffer handle it. */
}
}
#define MSR_SIZE 20
int msecs_response[MSR_SIZE];
int msr_point = -1;
int
get_msecs_response(int ix)
{
return (ix >= 0 && ix < MSR_SIZE) ? msecs_response[ix] : -1;
}
/*
* Remove an interactive player immediately.
*/
void
remove_interactive(struct interactive *ip, int link_dead)
{
struct object *save = command_giver;
struct object *ob = ip->ob;
int i;
if (!ob || !(ob->interactive))
return;
for (i = 0; i < MAX_PLAYERS; i++)
{
if (all_players[i] != ob->interactive)
continue;
if (ob->interactive->closing)
fatal("Double call to remove_interactive()\n");
command_giver = ob;
if (ob->interactive->ed_buffer)
{
extern void save_ed_buffer(void);
/* This will call 'get_ed_buffer_save_file_name' in master_ob
* If that fails(error in LPC) the closing IP will hang and
* on the next read a 'fatal read on closing socket will occur'
* unless we do this here before ip->closing = 1
*/
(void)add_message("Saving editor buffer.\n");
save_ed_buffer();
}
if (ob->interactive == NULL)
return;
ob->interactive->closing = 1;
if (ob->interactive->snoop_by)
{
ob->interactive->snoop_by->snoop_on = 0;
ob->interactive->snoop_by = 0;
}
if (ob->interactive->snoop_on)
{
ob->interactive->snoop_on->snoop_by = 0;
ob->interactive->snoop_on = 0;
}
write_socket("Closing down.\n", ob);
telnet_detach(ob->interactive->tp);
#ifdef SUPER_SNOOP
if (ob->interactive->snoop_fd >= 0) {
(void)close(ob->interactive->snoop_fd);
ob->interactive->snoop_fd = -1;
}
#endif
num_player--;
if (ob->interactive->input_to)
{
free_sentence(ob->interactive->input_to);
ob->interactive->input_to = 0;
}
if (ob->interactive->host_name)
free(ob->interactive->host_name);
if (ob->interactive->rname)
free(ob->interactive->rname);
if (current_interactive == ob)
current_interactive = 0;
free((char *)ob->interactive);
ob->interactive = 0;
all_players[i] = 0;
free_object(ob, "remove_interactive");
push_object(ob);
push_number(link_dead);
(void)apply_master_ob(M_REMOVE_INTERACTIVE,2);
command_giver = save;
return;
}
fatal("Could not find and remove player %s\n", ob->name);
}
/*
* get the I'th player object from the interactive list, i starts at 0
* and can go to num_player - 1. For users(), etc.
*/
struct object *
get_interactive_object(i)
int i;
{
int n;
if (i >= num_player) /* love them ASSERTS() :-) */
fatal("Get interactive (%d) with only %d players!\n", i, num_player);
for (n = 0; n < MAX_PLAYERS; n++)
if (all_players[n])
if (!(i--))
return(all_players[n]->ob);
fatal("Get interactive: player %d not found! (num_players = %d)\n",
i, num_player);
return 0; /* Just to satisfy some compiler warnings */
}
void *
new_player(void *tp, struct sockaddr_storage *addr, socklen_t len, u_short local_port)
{
int i;
for (i = 0; i < MAX_PLAYERS; i++)
{
struct interactive *inter;
struct object *ob;
struct svalue *ret;
extern struct object *master_ob;
if (all_players[i] != 0)
continue;
command_giver = master_ob;
current_interactive = master_ob;
inter = (struct interactive *)xalloc(sizeof (struct interactive));
memset(inter, 0, sizeof(struct interactive));
master_ob->interactive = inter;
master_ob->interactive->default_err_message = 0;
master_ob->flags |= O_ONCE_INTERACTIVE;
/* This initialization is not pretty. */
master_ob->interactive->rname = 0;
master_ob->interactive->ob = master_ob;
master_ob->interactive->input_to = 0;
master_ob->interactive->closing = 0;
master_ob->interactive->snoop_on = 0;
master_ob->interactive->snoop_by = 0;
master_ob->interactive->do_close = 0;
master_ob->interactive->noecho = 0;
master_ob->interactive->trace_level = 0;
master_ob->interactive->trace_prefix = 0;
master_ob->interactive->last_time = current_time;
master_ob->interactive->ed_buffer = 0;
#ifdef SUPER_SNOOP
master_ob->interactive->snoop_fd = -1;
#endif
#ifdef WORD_WRAP
master_ob->interactive->current_column = 0;
master_ob->interactive->screen_width = 0;
#endif
all_players[i] = master_ob->interactive;
all_players[i]->tp = tp;
set_prompt(NULL);
(void)memcpy((char *)&all_players[i]->addr, (char *)addr, len);
all_players[i]->addrlen = len;
all_players[i]->host_name = NULL;
all_players[i]->lport = local_port;
num_player++;
#ifndef NO_IP_DEMON
if (!no_ip_demon)
hname_sendreq(hname, query_ip_number(master_ob),
(u_short)all_players[i]->lport,
atoi(query_port_number(master_ob)));
#endif
/*
* The player object has one extra reference.
* It is asserted that the master_ob is loaded.
*/
add_ref(master_ob, "new_player");
ret = apply_master_ob(M_CONNECT, 0);
if (ret == 0 || ret->type != T_OBJECT ||
current_interactive != master_ob)
{
if (master_ob->interactive)
remove_interactive(master_ob->interactive, 0);
current_interactive = 0;
return NULL;
}
/*
* There was an object returned from connect(). Use this as the
* player object.
*/
ob = ret->u.ob;
ob->interactive = master_ob->interactive;
ob->interactive->ob = ob;
ob->flags |= O_ONCE_INTERACTIVE;
master_ob->flags &= ~O_ONCE_INTERACTIVE;
master_ob->interactive = 0;
free_object(master_ob, "reconnect");
add_ref(ob, "new_player");
command_giver = ob;
current_interactive = ob;
#ifdef SUPER_SNOOP
check_supersnoop(ob);
#endif
logon(ob);
current_interactive = 0;
return all_players[i];
}
telnet_output(tp, (u_char *)"Lpmud is full. Come back later.\n");
return NULL;
}
int
call_function_interactive(struct interactive *i, char *str)
{
struct closure *func;
if (!i->input_to)
return 0;
func = i->input_to->funct;
/*
* Special feature: input_to() has been called to setup
* a call to a function.
*/
if (!legal_closure(func))
{
/* Sorry, the object has selfdestructed ! */
free_sentence(i->input_to);
i->input_to = 0;
return 0;
}
INCREF(func->ref);
free_sentence(i->input_to);
/*
* We must clear this reference before the call, because
* someone might want to set up a new input_to().
*/
i->input_to = 0;
push_string(str, STRING_MSTRING);
current_object = func->funobj; /* It seems that some code relies on previous_object having a value, this will ensure that it does. */
(void)call_var(1, func);
free_closure(func);
return 1;
}
int
set_call(struct object *ob, struct sentence *sent, int noecho)
{
struct object *save = command_giver;
if (ob == 0 || sent == 0)
return 0;
if (ob->interactive == 0 || ob->interactive->input_to)
return 0;
ob->interactive->input_to = sent;
ob->interactive->noecho = noecho;
command_giver = ob;
if (noecho)
telnet_enable_echo(ob->interactive->tp);
command_giver = save;
return 1;
}
void
remove_all_players()
{
struct svalue *ret;
struct gdexception exception_frame;
exception_frame.e_exception = NULL;
exception_frame.e_catch = 0;
if (setjmp(exception_frame.e_context))
{
clear_state();
(void)add_message("Anomaly in the fabric of world space.\n");
ret = NULL;
}
else
{
exception = &exception_frame;
eval_cost = 0;
ret = apply_master_ob(M_START_SHUTDOWN, 0);
}
if (ret && ret->type == T_POINTER)
{
volatile int i;
struct vector *unload_vec = ret->u.vec;
INCREF(unload_vec->ref);
for (i = 0; i < unload_vec->size; i++)
if (setjmp(exception_frame.e_context))
{
clear_state();
(void)add_message("Anomaly in the fabric of world space.\n");
}
else
{
exception = &exception_frame;
push_svalue(&(unload_vec->item[i]));
eval_cost = 0;
(void)apply_master_ob(M_CLEANUP_SHUTDOWN, 1);
}
free_vector(unload_vec);
}
if (setjmp(exception_frame.e_context))
{
clear_state();
(void)add_message("Anomaly in the fabric of world space.\n");
}
else
{
exception = &exception_frame;
eval_cost = 0;
ret = apply_master_ob(M_FINAL_SHUTDOWN, 0);
}
exception = NULL;
}
void
set_prompt(char *str)
{
if (str)
command_giver->interactive->prompt = str;
else
command_giver->interactive->prompt = "> ";
}
/*
* Let object 'me' snoop object 'you'. If 'you' is 0, then turn off
* snooping.
*
* This routine is almost identical to the old set_snoop. The main
* difference is that the routine writes nothing to player directly,
* all such communication is taken care of by the mudlib. It communicates
* with master.c in order to find out if the operation is permissble or
* not. The old routine let everyone snoop anyone. This routine also returns
* 0 or 1 depending on success.
*/
int
set_snoop(struct object *me, struct object *you)
{
struct interactive *on = 0, *by = 0, *tmp;
int i;
struct svalue *ret;
extern struct object *master_ob;
/* Stop if people managed to quit before we got this far */
if (me->flags & O_DESTRUCTED)
return 0;
if (you && (you->flags & O_DESTRUCTED))
return 0;
/* Find the snooper & snopee */
for(i = 0 ; i < MAX_PLAYERS && (on == 0 || by == 0); i++)
{
if (all_players[i] == 0)
continue;
if (all_players[i]->ob == me)
by = all_players[i];
else if (all_players[i]->ob == you)
on = all_players[i];
}
/* Check for permissions with valid_snoop in master */
if (current_object != master_ob)
{
push_object(current_object);
push_object(me);
if (you == 0)
push_number(0);
else
push_object(you);
ret = apply_master_ob(M_VALID_SNOOP, 3);
if (ret && (ret->type != T_NUMBER || ret->u.number == 0))
return 0;
}
/* Stop snoop */
if (you == 0)
{
if (by == 0)
error("Could not find snooper to stop snoop on.\n");
if (by->snoop_on == 0)
return 1;
by->snoop_on->snoop_by = 0;
by->snoop_on = 0;
return 1;
}
/* Strange event, but possible, so test for it */
if (on == 0 || by == 0)
return 0;
/* Protect against snooping loops */
for (tmp = on; tmp; tmp = tmp->snoop_on)
{
if (tmp == by)
return 0;
}
/* Terminate previous snoop, if any */
if (by->snoop_on)
{
by->snoop_on->snoop_by = 0;
by->snoop_on = 0;
}
if (on->snoop_by)
{
on->snoop_by->snoop_on = 0;
on->snoop_by = 0;
}
on->snoop_by = by;
by->snoop_on = on;
return 1;
}
char *
query_ip_name(struct object *ob)
{
if (ob == 0)
ob = command_giver;
if (!ob || ob->interactive == 0)
return 0;
if (ob->interactive->host_name)
return ob->interactive->host_name;
return query_ip_number(ob);
}
char *
query_ip_number(struct object *ob)
{
static char host[NI_MAXHOST];
if (ob == 0)
ob = command_giver;
if (!ob || ob->interactive == 0)
return NULL;
if (getnameinfo((struct sockaddr*)&ob->interactive->addr, ob->interactive->addrlen, host, sizeof(host), NULL, 0, NI_NUMERICHOST) != 0)
return NULL;
return host;
}
char *
query_port_number(struct object *ob)
{
static char port[NI_MAXSERV];
if (ob == 0)
ob = command_giver;
if (!ob || ob->interactive == 0)
return NULL;
if (getnameinfo((struct sockaddr*)&ob->interactive->addr, ob->interactive->addrlen, NULL, 0, port, sizeof(port), NI_NUMERICSERV) != 0)
return NULL;
return port;
}
char *
query_host_name()
{
static char name[64];
(void)gethostname(name, sizeof(name));
name[sizeof(name) - 1] = '\0'; /* Just to make sure */
return name;
}
struct object *
query_snoop(struct object *ob)
{
if (ob->interactive->snoop_by == 0)
return 0;
return ob->interactive->snoop_by->ob;
}
int
query_idle(struct object *ob)
{
if (!ob->interactive)
error("query_idle() of non-interactive object.\n");
return current_time - ob->interactive->last_time;
}
void
notify_no_command()
{
char *p,*m;
extern struct object *vbfc_object;
if (!command_giver || !command_giver->interactive)
return;
p = command_giver->interactive->default_err_message;
if (p)
{
/* We want 'value by function call' */
m = process_string(p, vbfc_object != 0);
if (m) {
(void)add_message("%s", m);
free_mstring(m);
} else
(void)add_message("%s", p);
free_sstring(p);
command_giver->interactive->default_err_message = 0;
}
else
(void)add_message("What?\n");
}
void
clear_notify()
{
if (!command_giver || !command_giver->interactive)
return;
if (command_giver->interactive->default_err_message)
{
free_sstring(command_giver->interactive->default_err_message);
command_giver->interactive->default_err_message = 0;
}
}
void
set_notify_fail_message(char *str, int pri)
{
if (!command_giver || !command_giver->interactive)
return;
if (command_giver->interactive->default_err_message && pri == 0)
return;
clear_notify();
if (command_giver->interactive->default_err_message)
free_sstring(command_giver->interactive->default_err_message);
command_giver->interactive->default_err_message = make_sstring(str);
}
int
replace_interactive(struct object *ob, struct object *obfrom,
/*IGN*/char *name)
{
struct svalue *v;
/*
* Check with master that exec allowed
*/
push_string(name, STRING_MSTRING);
if (ob)
push_object(ob);
else
push_number(0);
push_object(obfrom);
v = apply_master_ob(M_VALID_EXEC, 3);
if (v && (v->type != T_NUMBER || v->u.number == 0))
return 0;
/* (void)fprintf(stderr,"DEBUG: %s,%s\n",ob->name,obfrom->name); */
if (ob && ob->interactive)
error("Bad argument1 to exec(), was an interactive\n");
if (!obfrom->interactive)
error("Bad argument2 to exec(), was not an interactive\n");
if (ob)
{
#ifdef SUPER_SNOOP
if (obfrom->interactive->snoop_fd >= 0) {
(void)close(obfrom->interactive->snoop_fd);
obfrom->interactive->snoop_fd = -1;
}
#endif
ob->interactive = obfrom->interactive;
ob->interactive->ob = ob;
ob->flags |= O_ONCE_INTERACTIVE;
add_ref(ob, "exec");
free_object(obfrom, "exec");
if (current_interactive == obfrom)
current_interactive = ob;
obfrom->interactive = 0;
obfrom->flags &= ~O_ONCE_INTERACTIVE;
#ifdef SUPER_SNOOP
check_supersnoop(ob);
#endif
}
else
remove_interactive(obfrom->interactive, 0);
if (obfrom == command_giver)
command_giver = ob;
return 1;
}
#ifdef DEBUG
/*
* This is used for debugging reference counts.
*/
void
update_ref_counts_for_players()
{
int i;
for (i = 0; i<MAX_PLAYERS; i++)
{
if (all_players[i] == 0)
continue;
all_players[i]->ob->extra_ref++;
if (all_players[i]->input_to)
all_players[i]->input_to->funct->funobj->extra_ref++;
}
}
#endif /* DEBUG */
void
interactive_input(struct interactive *ip, char *cp)
{
extern void print_mudstatus(char *, int, int, int);
extern void reset_mudstatus(void);
extern void update_load_av(void);
extern int get_processtime(void);
extern int get_millitime(void);
extern void ed_cmd(char *);
struct gdexception exception_frame;
ip->last_time = current_time;
#ifdef WORD_WRAP
ip->current_column = 0;
#endif
update_load_av();
command_giver = ip->ob;
current_object = NULL;
current_interactive = command_giver;
previous_ob = command_giver;
if (ip->noecho)
{
ip->noecho = 0;
telnet_disable_echo(ip->tp);