/* ************************************************************************
* File: comm.c Part of CircleMUD *
* Usage: Communication, socket handling, main(), central game loop *
* *
* All rights reserved. See license.doc for complete information. *
* *
* Copyright (C) 1993, 94 by the Trustees of the Johns Hopkins University *
* CircleMUD is based on DikuMUD, Copyright (C) 1990, 1991. *
************************************************************************ */
#define __COMM_C__
#include "conf.h"
#include "sysdep.h"
#ifdef CIRCLE_MACINTOSH /* Includes for the Macintosh */
# define SIGPIPE 13
# define SIGALRM 14
/* GUSI headers */
# include <sys/ioctl.h>
/* Codesaiyan dependant */
# include <SIOUX.h>
# include <console.h>
#endif
#ifdef CIRCLE_WINDOWS /* Includes for Win32 */
# ifdef __BORLANDC__
# include <dir.h>
# else /* MSVC */
# include <direct.h>
# endif
# include <mmsystem.h>
#endif /* CIRCLE_WINDOWS */
#ifdef CIRCLE_AMIGA /* Includes for the Amiga */
# include <sys/ioctl.h>
# include <clib/socket_protos.h>
#endif /* CIRCLE_AMIGA */
#ifdef CIRCLE_ACORN /* Includes for the Acorn (RiscOS) */
# include <socklib.h>
# include <inetlib.h>
# include <sys/ioctl.h>
#endif
/*
* Note, most includes for all platforms are in sysdep.h. The list of
* files that is included is controlled by conf.h for that platform.
*/
#include "structs.h"
#include "screen.h"
#include "utils.h"
#include "comm.h"
#include "interpreter.h"
#include "handler.h"
#include "db.h"
#include "house.h"
#include "olc.h"
#include "dg_scripts.h"
#include "color.c"
#ifdef HAVE_ARPA_TELNET_H
#include <arpa/telnet.h>
#else
#include "telnet.h"
#endif
#ifndef INVALID_SOCKET
#define INVALID_SOCKET -1
#endif
/* externs */
extern struct ban_list_element *ban_list;
extern int num_invalid;
extern char *startup;
extern const char circlemud_version[];
extern int circle_restrict;
extern int mini_mud;
extern int no_rent_check;
extern FILE *player_fl;
extern int DFLT_PORT;
extern char *DFLT_DIR;
extern char *DFLT_IP;
extern char *LOGNAME;
extern int MAX_PLAYERS;
extern struct room_data *world; /* In db.c */
extern int top_of_world; /* In db.c */
extern struct time_info_data time_info; /* In db.c */
extern char help[];
void proc_color(char *inbuf, int color);
extern int top_of_zone_table;
extern struct zone_data *zone_table;
extern const char *save_info_msg[]; /* In olc.c */
/* local globals */
struct descriptor_data *descriptor_list = NULL; /* master desc list */
struct txt_block *bufpool = 0; /* pool of large output buffers */
int buf_largecount = 0; /* # of large buffers which exist */
int buf_overflows = 0; /* # of overflows of output */
int buf_switches = 0; /* # of switches from small to large buf */
int circle_shutdown = 0; /* clean shutdown */
int circle_reboot = 0; /* reboot the game after a shutdown */
int no_specials = 0; /* Suppress ass. of special routines */
int max_players = 0; /* max descriptors available */
int tics = 0; /* for extern checkpointing */
int scheck = 0; /* for syntax checking mode */
int dg_act_check; /* toggle for act_trigger */
unsigned long dg_global_pulse = 0; /* number of pulses since game start */
extern int nameserver_is_slow; /* see config.c */
extern int auto_save; /* see config.c */
extern int autosave_time; /* see config.c */
struct timeval null_time; /* zero-valued time structure */
FILE *logfile = NULL; /* Where to send the log messages. */
/* functions in this file */
RETSIGTYPE reread_wizlists(int sig);
RETSIGTYPE unrestrict_game(int sig);
RETSIGTYPE reap(int sig);
RETSIGTYPE checkpointing(int sig);
RETSIGTYPE hupsig(int sig);
ssize_t perform_socket_read(socket_t desc, char *read_point,size_t space_left);
ssize_t perform_socket_write(socket_t desc, const char *txt,size_t length);
void echo_off(struct descriptor_data *d);
void echo_on(struct descriptor_data *d);
void sanity_check(void);
int get_from_q(struct txt_q *queue, char *dest, int *aliased);
void init_game(int port);
void signal_setup(void);
void game_loop(int mother_desc);
int init_socket(int port);
int new_descriptor(int s);
int get_max_players(void);
int process_output(struct descriptor_data *t);
int process_input(struct descriptor_data *t);
struct timeval *timediff(struct timeval a, struct timeval b);
struct timeval *timeadd(struct timeval a, struct timeval b);
void flush_queues(struct descriptor_data *d);
void nonblock(socket_t s);
int perform_subst(struct descriptor_data *t, char *orig, char *subst);
int perform_alias(struct descriptor_data *d, char *orig);
void record_usage(void);
char *make_prompt(struct descriptor_data *point);
void check_idle_passwords(void);
void heartbeat(int pulse);
struct in_addr *get_bind_addr(void);
int parse_ip(const char *addr, struct in_addr *inaddr);
int set_sendbuf(socket_t s);
#if defined(POSIX)
sigfunc *my_signal(int signo, sigfunc * func);
#endif
/* extern fcnts */
void reboot_wizlists(void);
void boot_world(void);
void affect_update(void); /* In spells.c */
void mobile_activity(void);
void string_add(struct descriptor_data *d, char *str);
void perform_violence(void);
void show_string(struct descriptor_data *d, char *input);
int isbanned(char *hostname);
void weather_and_time(int mode);
void redit_save_to_disk(int zone_num);
void oedit_save_to_disk(int zone_num);
void medit_save_to_disk(int zone_num);
void sedit_save_to_disk(int zone_num);
void zedit_save_to_disk(int zone_num);
int real_zone(int number);
#ifdef __CXREF__
#undef FD_ZERO
#undef FD_SET
#undef FD_ISSET
#undef FD_CLR
#define FD_ZERO(x)
#define FD_SET(x, y) 0
#define FD_ISSET(x, y) 0
#define FD_CLR(x, y)
#endif
/***********************************************************************
* main game loop and related stuff *
***********************************************************************/
#if defined(CIRCLE_WINDOWS) || defined(CIRCLE_MACINTOSH)
/* Windows doesn't have gettimeofday, so we'll simulate it. */
/* The Mac doesn't have gettimeofday either. */
void gettimeofday(struct timeval *t, struct timezone *dummy)
{
#if defined(CIRCLE_WINDOWS)
DWORD millisec = GetTickCount();
#elif defined(CIRCLE_MACINTOSH)
unsigned long int millisec;
millisec = (int)((float)TickCount() * 1000.0 / 60.0);
#endif
t->tv_sec = (int) (millisec / 1000);
t->tv_usec = (millisec % 1000) * 1000;
}
#endif /* CIRCLE_WINDOWS || CIRCLE_MACINTOSH */
int main(int argc, char **argv)
{
int port;
int pos = 1;
char *dir;
/* Initialize these to check for overruns later. */
buf[MAX_STRING_LENGTH - 1] = buf1[MAX_STRING_LENGTH - 1] = MAGIC_NUMBER;
buf2[MAX_STRING_LENGTH - 1] = arg[MAX_STRING_LENGTH - 1] = MAGIC_NUMBER;
#ifdef CIRCLE_MACINTOSH
/*
* ccommand() calls the command line/io redirection dialog box from
* Codesaiyans's SIOUX library
*/
argc = ccommand(&argv);
/* Initialize the GUSI library calls. */
GUSIDefaultSetup();
#endif
port = DFLT_PORT;
dir = DFLT_DIR;
/*
* It would be nice to make this a command line option but the parser uses
* the log() function, maybe later. -gg
*/
if (LOGNAME == NULL || *LOGNAME == '\0')
logfile = fdopen(STDERR_FILENO, "w");
else
logfile = freopen(LOGNAME, "w", stderr);
if (logfile == NULL) {
printf("error opening log file %s: %s\n",
LOGNAME ? LOGNAME : "stderr", strerror(errno));
exit(1);
}
log(circlemud_version);
log(DG_SCRIPT_VERSION);
while ((pos < argc) && (*(argv[pos]) == '-')) {
switch (*(argv[pos] + 1)) {
case 'd':
if (*(argv[pos] + 2))
dir = argv[pos] + 2;
else if (++pos < argc)
dir = argv[pos];
else {
log("SYSERR: Directory arg expected after option -d.");
exit(1);
}
break;
case 'm':
mini_mud = 1;
no_rent_check = 1;
log("Running in minimized mode & with no rent check.");
break;
case 'c':
scheck = 1;
log("Syntax check mode enabled.");
break;
case 'q':
no_rent_check = 1;
log("Quick boot mode -- rent check supressed.");
break;
case 'r':
circle_restrict = 1;
log("Restricting game -- no new players allowed.");
break;
case 's':
no_specials = 1;
log("Suppressing assignment of special routines.");
break;
default:
log("SYSERR: Unknown option -%c in argument string.", *(argv[pos] + 1));
break;
}
pos++;
}
if (pos < argc) {
if (!isdigit(*argv[pos])) {
log("Usage: %s [-c] [-m] [-q] [-r] [-s] [-d pathname] [port #]\n", argv[0]);
exit(1);
} else if ((port = atoi(argv[pos])) <= 1024) {
log("SYSERR: Illegal port number %d.", port);
exit(1);
}
}
if (chdir(dir) < 0) {
perror("SYSERR: Fatal error changing to data directory");
exit(1);
}
log("Using %s as data directory.", dir);
if (scheck) {
boot_world();
log("Done.");
} else {
log("Running game on port %d.", port);
init_game(port);
}
return 0;
}
/* Init sockets, run game, and cleanup sockets */
void init_game(int port)
{
int mother_desc;
/* We don't want to restart if we crash before we get up. */
touch(KILLSCRIPT_FILE);
circle_srandom(time(0));
log("Finding player limit.");
max_players = get_max_players();
log("Opening mother connection.");
mother_desc = init_socket(port);
boot_db();
#ifdef CIRCLE_UNIX
log("Signal trapping.");
signal_setup();
#endif
/* If we made it this far, we will be able to restart without problem. */
remove(KILLSCRIPT_FILE);
log("Entering game loop.");
game_loop(mother_desc);
log("Closing all sockets.");
while (descriptor_list)
close_socket(descriptor_list);
CLOSE_SOCKET(mother_desc);
fclose(player_fl);
if (circle_reboot != 2 && olc_save_list) { /* Don't save zones. */
struct olc_save_info *entry, *next_entry;
int rznum;
for (entry = olc_save_list; entry; entry = next_entry) {
next_entry = entry->next;
if (entry->type < 0 || entry->type > 4) {
sprintf(buf, "OLC: Illegal save type %d!", entry->type);
log(buf);
} else if ((rznum = real_zone(entry->zone * 100)) == -1) {
sprintf(buf, "OLC: Illegal save zone %d!", entry->zone);
log(buf);
} else if (rznum < 0 || rznum > top_of_zone_table) {
sprintf(buf, "OLC: Invalid real zone number %d!", rznum);
log(buf);
} else {
sprintf(buf, "OLC: Reboot saving %s for zone %d.",
save_info_msg[(int)entry->type], zone_table[rznum].number);
log(buf);
switch (entry->type) {
case OLC_SAVE_ROOM: redit_save_to_disk(rznum); break;
case OLC_SAVE_OBJ: oedit_save_to_disk(rznum); break;
case OLC_SAVE_MOB: medit_save_to_disk(rznum); break;
case OLC_SAVE_ZONE: zedit_save_to_disk(rznum); break;
case OLC_SAVE_SHOP: sedit_save_to_disk(rznum); break;
default: log("Unexpected olc_save_list->type"); break;
}
}
}
}
if (circle_reboot) {
log("Rebooting.");
exit(52); /* what's so great about HHGTTG, anyhow? */
}
log("Normal termination of game.");
}
/*
* init_socket sets up the mother descriptor - creates the socket, sets
* its options up, binds it, and listens.
*/
int init_socket(int port)
{
int s, opt;
struct sockaddr_in sa;
#ifdef CIRCLE_WINDOWS
{
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(1, 1);
if (WSAStartup(wVersionRequested, &wsaData) != 0) {
log("SYSERR: WinSock not available!");
exit(1);
}
if ((wsaData.iMaxSockets - 4) < max_players) {
max_players = wsaData.iMaxSockets - 4;
}
log("Max players set to %d", max_players);
if ((s = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
log("SYSERR: Error opening network connection: Winsock error #%d",
WSAGetLastError());
exit(1);
}
}
#else
/*
* Should the first argument to socket() be AF_INET or PF_INET? I don't
* know, take your pick. PF_INET seems to be more widely adopted, and
* Comer (_Internetworking with TCP/IP_) even makes a point to say that
* people erroneously use AF_INET with socket() when they should be using
* PF_INET. However, the man pages of some systems indicate that AF_INET
* is correct; some such as ConvexOS even say that you can use either one.
* All implementations I've seen define AF_INET and PF_INET to be the same
* number anyway, so the point is (hopefully) moot.
*/
if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
perror("SYSERR: Error creating socket");
exit(1);
}
#endif /* CIRCLE_WINDOWS */
#if defined(SO_REUSEADDR) && !defined(CIRCLE_MACINTOSH)
opt = 1;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt)) < 0){
perror("SYSERR: setsockopt REUSEADDR");
exit(1);
}
#endif
set_sendbuf(s);
#if defined(SO_LINGER)
{
struct linger ld;
ld.l_onoff = 0;
ld.l_linger = 0;
if (setsockopt(s, SOL_SOCKET, SO_LINGER, (char *) &ld, sizeof(ld)) < 0) {
perror("SYSERR: setsockopt LINGER");
exit(1);
}
}
#endif
/* Clear the structure */
memset((char *)&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
sa.sin_port = htons(port);
sa.sin_addr = *(get_bind_addr());
if (bind(s, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
perror("SYSERR: bind");
CLOSE_SOCKET(s);
exit(1);
}
nonblock(s);
listen(s, 5);
return s;
}
int get_max_players(void)
{
#ifndef CIRCLE_UNIX
return MAX_PLAYERS;
#else
int max_descs = 0;
const char *method;
/*
* First, we'll try using getrlimit/setrlimit. This will probably work
* on most systems. HAS_RLIMIT is defined in sysdep.h.
*/
#ifdef HAS_RLIMIT
{
struct rlimit limit;
/* find the limit of file descs */
method = "rlimit";
if (getrlimit(RLIMIT_NOFILE, &limit) < 0) {
perror("SYSERR: calling getrlimit");
exit(1);
}
/* set the current to the maximum */
limit.rlim_cur = limit.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &limit) < 0) {
perror("SYSERR: calling setrlimit");
exit(1);
}
#ifdef RLIM_INFINITY
if (limit.rlim_max == RLIM_INFINITY)
max_descs = MAX_PLAYERS + NUM_RESERVED_DESCS;
else
max_descs = MIN(MAX_PLAYERS + NUM_RESERVED_DESCS, limit.rlim_max);
#else
max_descs = MIN(MAX_PLAYERS + NUM_RESERVED_DESCS, limit.rlim_max);
#endif
}
#elif defined (OPEN_MAX) || defined(FOPEN_MAX)
#if !defined(OPEN_MAX)
#define OPEN_MAX FOPEN_MAX
#endif
method = "OPEN_MAX";
max_descs = OPEN_MAX; /* Uh oh.. rlimit didn't work, but we have
* OPEN_MAX */
#elif defined (_SC_OPEN_MAX)
/*
* Okay, you don't have getrlimit() and you don't have OPEN_MAX. Time to
* try the POSIX sysconf() function. (See Stevens' _Advanced Programming
* in the UNIX Environment_).
*/
method = "POSIX sysconf";
errno = 0;
if ((max_descs = sysconf(_SC_OPEN_MAX)) < 0) {
if (errno == 0)
max_descs = MAX_PLAYERS + NUM_RESERVED_DESCS;
else {
perror("SYSERR: Error calling sysconf");
exit(1);
}
}
#else
/* if everything has failed, we'll just take a guess */
method = "random guess"
max_descs = MAX_PLAYERS + NUM_RESERVED_DESCS;
#endif
/* now calculate max _players_ based on max descs */
max_descs = MIN(MAX_PLAYERS, max_descs - NUM_RESERVED_DESCS);
if (max_descs <= 0) {
log("SYSERR: Non-positive max player limit! (Set at %d using %s).",
max_descs, method);
exit(1);
}
log("Setting player limit to %d using %s.", max_descs, method);
return max_descs;
#endif /* CIRCLE_UNIX */
}
/*
* game_loop contains the main loop which drives the entire MUD. It
* cycles once every 0.10 seconds and is responsible for accepting new
* new connections, polling existing connections for input, dequeueing
* output and sending it out to players, and calling "heartbeat" functions
* such as mobile_activity().
*/
void game_loop(int mother_desc)
{
fd_set input_set, output_set, exc_set, null_set;
struct timeval last_time, before_sleep, opt_time, process_time, now, timeout;
char comm[MAX_INPUT_LENGTH];
struct descriptor_data *d, *next_d;
int pulse = 0, missed_pulses = 0, maxdesc, aliased;
/* initialize various time values */
null_time.tv_sec = 0;
null_time.tv_usec = 0;
opt_time.tv_usec = OPT_USEC;
opt_time.tv_sec = 0;
FD_ZERO(&null_set);
gettimeofday(&last_time, (struct timezone *) 0);
/* The Main Loop. The Big Cheese. The Top Dog. The Head Honcho. The.. */
while (!circle_shutdown) {
/* Sleep if we don't have any connections */
if (descriptor_list == NULL) {
log("No connections. Going to sleep.");
FD_ZERO(&input_set);
FD_SET(mother_desc, &input_set);
if (select(mother_desc + 1, &input_set, (fd_set *) 0, (fd_set *) 0, NULL) < 0) {
if (errno == EINTR)
log("Waking up to process signal.");
else
perror("Select coma");
} else
log("New connection. Waking up.");
gettimeofday(&last_time, (struct timezone *) 0);
}
/* Set up the input, output, and exception sets for select(). */
FD_ZERO(&input_set);
FD_ZERO(&output_set);
FD_ZERO(&exc_set);
FD_SET(mother_desc, &input_set);
maxdesc = mother_desc;
for (d = descriptor_list; d; d = d->next) {
#ifndef CIRCLE_WINDOWS
if (d->descriptor > maxdesc)
maxdesc = d->descriptor;
#endif
FD_SET(d->descriptor, &input_set);
FD_SET(d->descriptor, &output_set);
FD_SET(d->descriptor, &exc_set);
}
/*
* At this point, we have completed all input, output and heartbeat
* activity from the previous iteration, so we have to put ourselves
* to sleep until the next 0.1 second tick. The first step is to
* calculate how long we took processing the previous iteration.
*/
gettimeofday(&before_sleep, (struct timezone *) 0); /* current time */
process_time = *timediff(before_sleep, last_time);
/*
* If we were asleep for more than one pass, count missed pulses and sleep
* until we're resynchronized with the next upcoming pulse.
*/
if (process_time.tv_sec == 0 && process_time.tv_usec < OPT_USEC) {
missed_pulses = 0;
} else {
missed_pulses = process_time.tv_sec * PASSES_PER_SEC;
missed_pulses += process_time.tv_usec / OPT_USEC;
process_time.tv_sec = 0;
process_time.tv_usec = process_time.tv_usec % OPT_USEC;
}
/* Calculate the time we should wake up */
last_time = *timeadd(before_sleep, *timediff(opt_time, process_time));
/* Now keep sleeping until that time has come */
gettimeofday(&now, (struct timezone *) 0);
timeout = *timediff(last_time, now);
/* Go to sleep */
do {
#ifdef CIRCLE_WINDOWS
Sleep(timeout.tv_sec * 1000 + timeout.tv_usec / 1000);
#else
if (select(0, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &timeout) < 0) {
if (errno != EINTR) {
perror("SYSERR: Select sleep");
exit(1);
}
}
#endif /* CIRCLE_WINDOWS */
gettimeofday(&now, (struct timezone *) 0);
timeout = *timediff(last_time, now);
} while (timeout.tv_usec || timeout.tv_sec);
/* Poll (without blocking) for new input, output, and exceptions */
if (select(maxdesc + 1, &input_set, &output_set, &exc_set, &null_time) < 0) {
perror("Select poll");
return;
}
/* If there are new connections waiting, accept them. */
if (FD_ISSET(mother_desc, &input_set))
new_descriptor(mother_desc);
/* Kick out the freaky folks in the exception set and marked for close */
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
if (FD_ISSET(d->descriptor, &exc_set)) {
FD_CLR(d->descriptor, &input_set);
FD_CLR(d->descriptor, &output_set);
close_socket(d);
}
}
/* Process descriptors with input pending */
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
if (FD_ISSET(d->descriptor, &input_set))
if (process_input(d) < 0)
close_socket(d);
}
/* Process commands we just read from process_input */
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
/* Not combined to retain --(d->wait) behavior. -gg 2/20/98 */
d->wait -= (d->wait > 0);
if (d->wait > 0)
continue;
if (!get_from_q(&d->input, comm, &aliased))
continue;
if (d->character) {
/* Reset the idle timer & pull char back from void if necessary */
d->character->char_specials.timer = 0;
if (STATE(d) == CON_PLAYING && GET_WAS_IN(d->character) != NOWHERE) {
if (d->character->in_room != NOWHERE)
char_from_room(d->character);
char_to_room(d->character, GET_WAS_IN(d->character));
GET_WAS_IN(d->character) = NOWHERE;
act("$n has returned.", TRUE, d->character, 0, 0, TO_ROOM);
}
}
d->wait = 1;
d->has_prompt = 0;
/*
* I reversed these top 2 if checks so that you can use the
*/
if (d->showstr_count) /* Reading something w/ pager */
show_string(d, comm);
else if (d->str)
string_add(d, comm);
else if (STATE(d) != CON_PLAYING) /* In menus, etc. */
nanny(d, comm);
else { /* else: we're playing normally. */
if (aliased) /* To prevent recursive aliases. */
d->has_prompt = 1; /* To get newline before next cmd output. */
else if (perform_alias(d, comm)) /* Run it through aliasing system */
get_from_q(&d->input, comm, &aliased);
command_interpreter(d->character, comm); /* Send it to interpreter */
}
}
/* Send queued output out to the operating system (ultimately to user) */
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
if (*(d->output) && FD_ISSET(d->descriptor, &output_set)) {
/* Output for this player is ready */
if (process_output(d) < 0 && d)
close_socket(d);
else
d->has_prompt = 1;
}
}
/* Print prompts for other descriptors who had no other output */
for (d = descriptor_list; d; d = d->next) {
if (!d->has_prompt) {
write_to_descriptor(d->descriptor, make_prompt(d));
d->has_prompt = 1;
}
}
/* Kick out folks in the CON_CLOSE or CON_DISCONNECT state */
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
if (STATE(d) == CON_CLOSE || STATE(d) == CON_DISCONNECT)
close_socket(d);
}
/*
* Now, we execute as many pulses as necessary--just one if we haven't
* missed any pulses, or make up for lost time if we missed a few
* pulses by sleeping for too long.
*/
missed_pulses++;
if (missed_pulses <= 0) {
log("SYSERR: **BAD** MISSED_PULSES NONPOSITIVE (%d), TIME GOING BACKWARDS!!", missed_pulses);
missed_pulses = 1;
}
/* If we missed more than 30 seconds worth of pulses, just do 30 secs */
if (missed_pulses > (30 * PASSES_PER_SEC)) {
log("SYSERR: Missed %d seconds worth of pulses.", missed_pulses / PASSES_PER_SEC);
missed_pulses = 30 * PASSES_PER_SEC;
}
/* Now execute the heartbeat functions */
while (missed_pulses--)
heartbeat(++pulse);
/* Roll pulse over after 10 hours */
if (pulse >= (600 * 60 * PASSES_PER_SEC))
pulse = 0;
#ifdef CIRCLE_UNIX
/* Update tics for deadlock protection (UNIX only) */
tics++;
#endif
}
}
void heartbeat(int pulse)
{
static int mins_since_crashsave = 0;
void process_events(void);
dg_global_pulse++;
process_events();
if (!(pulse % PULSE_DG_SCRIPT))
script_trigger_check();
if (!(pulse % (30 * PASSES_PER_SEC)))
sanity_check();
if (!(pulse % PULSE_ZONE))
zone_update();
if (!(pulse % (15 * PASSES_PER_SEC))) /* 15 seconds */
check_idle_passwords();
if (!(pulse % PULSE_MOBILE))
mobile_activity();
if (!(pulse % PULSE_VIOLENCE))
perform_violence();
if (!(pulse % (SECS_PER_MUD_HOUR * PASSES_PER_SEC))) {
weather_and_time(1);
affect_update();
point_update();
fflush(player_fl);
}
if (auto_save && !(pulse % (60 * PASSES_PER_SEC))) { /* 1 minute */
if (++mins_since_crashsave >= autosave_time) {
mins_since_crashsave = 0;
Crash_save_all();
House_save_all();
}
}
if (!(pulse % (5 * 60 * PASSES_PER_SEC))) /* 5 minutes */
record_usage();
}
/* ******************************************************************
* general utility stuff (for local use) *
****************************************************************** */
/*
* new code to calculate time differences, which works on systems
* for which tv_usec is unsigned (and thus comparisons for something
* being < 0 fail). Based on code submitted by ss@sirocco.cup.hp.com.
*/
/*
* code to return the time difference between a and b (a-b).
* always returns a nonnegative value (floors at 0).
*
* Fixed the 'aggregate return' warning. Now it's not thread-safe.
* -gg 6/18/98
*/
struct timeval *timediff(struct timeval a, struct timeval b)
{
static struct timeval rslt;
if (a.tv_sec < b.tv_sec)
return &null_time;
else if (a.tv_sec == b.tv_sec) {
if (a.tv_usec < b.tv_usec)
return &null_time;
else {
rslt.tv_sec = 0;
rslt.tv_usec = a.tv_usec - b.tv_usec;
return &rslt;
}
} else { /* a->tv_sec > b->tv_sec */
rslt.tv_sec = a.tv_sec - b.tv_sec;
if (a.tv_usec < b.tv_usec) {
rslt.tv_usec = a.tv_usec + 1000000 - b.tv_usec;
rslt.tv_sec--;
} else
rslt.tv_usec = a.tv_usec - b.tv_usec;
return &rslt;
}
}
/*
* add 2 timevals
*
* Fixed the 'aggregate return' warning. Not thread-safe now.
* -gg 6/18/98
*/
struct timeval *timeadd(struct timeval a, struct timeval b)
{
static struct timeval rslt;
rslt.tv_sec = a.tv_sec + b.tv_sec;
rslt.tv_usec = a.tv_usec + b.tv_usec;
while (rslt.tv_usec >= 1000000) {
rslt.tv_usec -= 1000000;
rslt.tv_sec++;
}
return &rslt;
}
void record_usage(void)
{
int sockets_connected = 0, sockets_playing = 0;
struct descriptor_data *d;
for (d = descriptor_list; d; d = d->next) {
sockets_connected++;
if (STATE(d) == CON_PLAYING)
sockets_playing++;
}
log("nusage: %-3d sockets connected, %-3d sockets playing",
sockets_connected, sockets_playing);
#ifdef RUSAGE
{
struct rusage ru;
getrusage(RUSAGE_SELF, &ru);
log("rusage: user time: %ld sec, system time: %ld sec, max res size: %ld",
ru.ru_utime.tv_sec, ru.ru_stime.tv_sec, ru.ru_maxrss);
}
#endif
}
/*
* Turn off echoing (specific to telnet client)
*/
void echo_off(struct descriptor_data *d)
{
char off_string[] =
{
(char) IAC,
(char) WILL,
(char) TELOPT_ECHO,
(char) 0,
};
SEND_TO_Q(off_string, d);
}
/*
* Turn on echoing (specific to telnet client)
*/
void echo_on(struct descriptor_data *d)
{
char on_string[] =
{
(char) IAC,
(char) WONT,
(char) TELOPT_ECHO,
(char) TELOPT_NAOFFD,
(char) TELOPT_NAOCRD,
(char) 0,
};
SEND_TO_Q(on_string, d);
}
char *make_prompt(struct descriptor_data *d)
{
static char prompt[256];
/* Note, prompt is truncated at MAX_PROMPT_LENGTH chars (structs.h )*/
/*
* These two checks were reversed to allow page_string() to work in the
* online editor.
*/
if (d->showstr_count)
sprintf(prompt,
"\r[ Return to continue, (q)uit, (r)efresh, (b)ack, or page number (%d/%d) ]",
d->showstr_page, d->showstr_count);
else if (d->str)
strcpy(prompt, "] ");
else if (STATE(d) == CON_PLAYING && !IS_NPC(d->character)) {
*prompt = '\0';
if (PRF_FLAGGED(d->character, PRF_DISPHP) && GET_HIT(d->character))
sprintf(prompt + strlen(prompt), "\x1B[37m(\x1B[1;34mPl\x1B[37m:\x1B[1;32m%Ld\x1B[37m)\r\n", GET_STR(d->character)*2+GET_MANA(d->character)/4*GET_LEVEL(d->character)+GET_DAMROLL(d->character));
sprintf(prompt + strlen(prompt), "\x1B[37m(\x1B[1;31mHp\x1B[1;37m:\x1B[36m%d\x1B[1;31m|", GET_HIT(d->character));
if (PRF_FLAGGED(d->character, PRF_DISPMANA))
sprintf(prompt + strlen(prompt), "\x1B[1;33mKi\x1B[1;37m:\x1B[36m%d\x1B[1;31m|\x1B[1;32mEn\x1B[1;37m:\x1B[36m%d\x1B[37m)\x1B[0;0m", GET_MANA(d->character), GET_MOVE(d->character));
strcat(prompt, "");
} else if (STATE(d) == CON_PLAYING && IS_NPC(d->character))
sprintf(prompt, "%s ", GET_NAME(d->character));
else
*prompt = '\0';
return prompt;
}
void write_to_q(const char *txt, struct txt_q *queue, int aliased)
{
struct txt_block *newt;
CREATE(newt, struct txt_block, 1);
CREATE(newt->text, char, strlen(txt) + 1);
strcpy(newt->text, txt);
newt->aliased = aliased;
/* queue empty? */
if (!queue->head) {
newt->next = NULL;
queue->head = queue->tail = newt;
} else {
queue->tail->next = newt;
queue->tail = newt;
newt->next = NULL;
}
}
int get_from_q(struct txt_q *queue, char *dest, int *aliased)
{
struct txt_block *tmp;
/* queue empty? */
if (!queue->head)
return 0;
tmp = queue->head;
strcpy(dest, queue->head->text);
*aliased = queue->head->aliased;
queue->head = queue->head->next;
free(tmp->text);
free(tmp);
return 1;
}
/* Empty the queues before closing connection */
void flush_queues(struct descriptor_data *d)
{
int dummy;
if (d->large_outbuf) {
d->large_outbuf->next = bufpool;
bufpool = d->large_outbuf;
}
while (get_from_q(&d->input, buf2, &dummy));
}
/* Add a new string to a player's output queue */
void write_to_output(const char *txt, struct descriptor_data *t)
{
int size;
size = strlen(txt);
/* if we're in the overflow state already, ignore this new output */
if (t->bufptr < 0)
return;
/* if we have enough space, just write to buffer and that's it! */
if (t->bufspace >= size) {
strcpy(t->output + t->bufptr, txt);
t->bufspace -= size;
t->bufptr += size;
return;
}
/*
* If the text is too big to fit into even a large buffer, chuck the
* new text and switch to the overflow state.
*/
if (size + t->bufptr > LARGE_BUFSIZE - 1) {
t->bufptr = -1;
buf_overflows++;
return;
}
buf_switches++;
/* if the pool has a buffer in it, grab it */
if (bufpool != NULL) {
t->large_outbuf = bufpool;
bufpool = bufpool->next;
} else { /* else create a new one */
CREATE(t->large_outbuf, struct txt_block, 1);
CREATE(t->large_outbuf->text, char, LARGE_BUFSIZE);
buf_largecount++;
}
strcpy(t->large_outbuf->text, t->output); /* copy to big buffer */
t->output = t->large_outbuf->text; /* make big buffer primary */
strcat(t->output, txt); /* now add new text */
/* set the pointer for the next write */
t->bufptr = strlen(t->output);
/* calculate how much space is left in the buffer */
t->bufspace = LARGE_BUFSIZE - 1 - t->bufptr;
}
/* ******************************************************************
* socket handling *
****************************************************************** */
/*
* get_bind_addr: Return a struct in_addr that should be used in our
* call to bind(). If the user has specified a desired binding
* address, we try to bind to it; otherwise, we bind to INADDR_ANY.
* Note that inet_aton() is preferred over inet_addr() so we use it if
* we can. If neither is available, we always bind to INADDR_ANY.
*/
struct in_addr *get_bind_addr()
{
static struct in_addr bind_addr;
/* Clear the structure */
memset((char *) &bind_addr, 0, sizeof(bind_addr));
/* If DLFT_IP is unspecified, use INADDR_ANY */
if (DFLT_IP == NULL) {
bind_addr.s_addr = htonl(INADDR_ANY);
} else {
/* If the parsing fails, use INADDR_ANY */
if (!parse_ip(DFLT_IP, &bind_addr)) {
log("SYSERR: DFLT_IP of %s appears to be an invalid IP address",DFLT_IP);
bind_addr.s_addr = htonl(INADDR_ANY);
}
}
/* Put the address that we've finally decided on into the logs */
if (bind_addr.s_addr == htonl(INADDR_ANY))
log("Binding to all IP interfaces on this host.");
else
log("Binding only to IP address %s", inet_ntoa(bind_addr));
return &bind_addr;
}
#ifdef HAVE_INET_ATON
/*
* inet_aton's interface is the same as parse_ip's: 0 on failure, non-0 if
* successful
*/
int parse_ip(const char *addr, struct in_addr *inaddr)
{
return inet_aton(addr, inaddr);
}
#elif HAVE_INET_ADDR
/* inet_addr has a different interface, so we emulate inet_aton's */
int parse_ip(const char *addr, struct in_addr *inaddr)
{
long ip;
if ((ip = inet_addr(addr)) == -1) {
return 0;
} else {
inaddr->s_addr = (unsigned long) ip;
return 1;
}
}
#else
/* If you have neither function - sorry, you can't do specific binding. */
int parse_ip(const char *addr, struct in_addr *inaddr)
{
log("SYSERR: warning: you're trying to set DFLT_IP but your system has no\n"
"functions to parse IP addresses (how bizarre!)");
return 0;
}
#endif /* INET_ATON and INET_ADDR */
/* Sets the kernel's send buffer size for the descriptor */
int set_sendbuf(socket_t s)
{
#if defined(SO_SNDBUF) && !defined(CIRCLE_MACINTOSH)
int opt = MAX_SOCK_BUF;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *) &opt, sizeof(opt)) < 0) {
perror("SYSERR: setsockopt SNDBUF");
return -1;
}
#if 0
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *) &opt, sizeof(opt)) < 0) {
perror("SYSERR: setsockopt RCVBUF");
return -1;
}
#endif
#endif
return 0;
}
int new_descriptor(int s) {
socket_t desc;
int sockets_connected = 0;
unsigned int i;
static int last_desc = 0; /* last descriptor number */
struct descriptor_data *newd;
struct sockaddr_in peer;
struct hostent *from;
/* accept the new connection */
i = sizeof(peer);
if ((desc = accept(s, (struct sockaddr *) &peer, &i)) == INVALID_SOCKET) {
perror("accept");
return -1;
}
/* keep it from blocking */
nonblock(desc);
/* set the send buffer size */
if (set_sendbuf(desc) < 0) {
CLOSE_SOCKET(desc);
return 0;
}
/* make sure we have room for it */
for (newd = descriptor_list; newd; newd = newd->next)
sockets_connected++;
if (sockets_connected >= max_players) {
write_to_descriptor(desc, "Sorry, CircleMUD is full right now... please try again later!\r\n");
CLOSE_SOCKET(desc);
return 0;
}
/* create a new descriptor */
CREATE(newd, struct descriptor_data, 1);
memset((char *) newd, 0, sizeof(struct descriptor_data));
/* find the sitename */
if (nameserver_is_slow || !(from = gethostbyaddr((char *) &peer.sin_addr,
sizeof(peer.sin_addr), AF_INET))) {
/* resolution failed */
if (!nameserver_is_slow)
perror("gethostbyaddr");
/* find the numeric site address */
strncpy(newd->host, inet_ntoa(peer.sin_addr), HOST_LENGTH);
*(newd->host + HOST_LENGTH) = '\0';
} else {
strncpy(newd->host, from->h_name, HOST_LENGTH);
*(newd->host + HOST_LENGTH) = '\0';
}
/* determine if the site is banned */
if (isbanned(newd->host) == BAN_ALL) {
CLOSE_SOCKET(desc);
sprintf(buf2, "Connection attempt denied from [%s]", newd->host);
mudlog(buf2, CMP, LVL_GOD, TRUE);
free(newd);
return 0;
}
#if 0
/* Log new connections - probably unnecessary, but you may want it */
sprintf(buf2, "New connection from [%s]", newd->host);
mudlog(buf2, CMP, LVL_GOD, FALSE);
#endif
/* initialize descriptor data */
newd->descriptor = desc;
newd->connected = CON_GET_NAME;
newd->idle_tics = 0;
newd->wait = 1;
newd->output = newd->small_outbuf;
newd->bufspace = SMALL_BUFSIZE - 1;
newd->login_time = time(0);
*newd->output = '\0';
newd->bufptr = 0;
newd->has_prompt = 1; /* prompt is part of greetings */
/*
* This isn't exactly optimal but allows us to make a design choice.
* Do we embed the history in descriptor_data or keep it dynamically
* allocated and allow a user defined history size?
*/
CREATE(newd->history, char *, HISTORY_SIZE);
if (++last_desc == 1000)
last_desc = 1;
newd->desc_num = last_desc;
/* prepend to list */
newd->next = descriptor_list;
descriptor_list = newd;
SEND_TO_Q(startup, newd);
SEND_TO_Q("By what name do you wish to be known? ", newd);
return 0;
}
/*
* Send all of the output that we've accumulated for a player out to
* the player's descriptor.
* FIXME - This will be rewritten before 3.1, this code is dumb.
*/
int process_output(struct descriptor_data *t)
{
char i[MAX_SOCK_BUF];
int result;
/* we may need this \r\n for later -- see below */
strcpy(i, "\r\n");
/* now, append the 'real' output */
strcpy(i + 2, t->output);
/* if we're in the overflow state, notify the user */
if (t->bufptr < 0)
strcat(i, "**OVERFLOW**\r\n");
/* add the extra CRLF if the person isn't in compact mode */
if (STATE(t) == CON_PLAYING && t->character && !IS_NPC(t->character) && !PRF_FLAGGED(t->character, PRF_COMPACT))
strcat(i + 2, "\r\n");
if(t->character)
proc_color(i, (clr(t->character, C_NRM)));
/* add a prompt */
strncat(i + 2, make_prompt(t), MAX_PROMPT_LENGTH);
/*
* now, send the output. If this is an 'interruption', use the prepended
* CRLF, otherwise send the straight output sans CRLF.
*/
if (t->has_prompt) /* && !t->connected) */
result = write_to_descriptor(t->descriptor, i);
else
result = write_to_descriptor(t->descriptor, i + 2);
/* handle snooping: prepend "% " and send to snooper */
if (t->snoop_by) {
SEND_TO_Q("% ", t->snoop_by);
SEND_TO_Q(t->output, t->snoop_by);
SEND_TO_Q("%%", t->snoop_by);
}
/*
* if we were using a large buffer, put the large buffer on the buffer pool
* and switch back to the small one
*/
if (t->large_outbuf) {
t->large_outbuf->next = bufpool;
bufpool = t->large_outbuf;
t->large_outbuf = NULL;
t->output = t->small_outbuf;
}
/* reset total bufspace back to that of a small buffer */
t->bufspace = SMALL_BUFSIZE - 1;
t->bufptr = 0;
*(t->output) = '\0';
return result;
}
/*
* perform_socket_write: takes a descriptor, a pointer to text, and a
* text length, and tries once to send that text to the OS. This is
* where we stuff all the platform-dependent stuff that used to be
* ugly #ifdef's in write_to_descriptor().
*
* This function must return:
*
* -1 If a fatal error was encountered in writing to the descriptor.
* 0 If a transient failure was encountered (e.g. socket buffer full).
* >0 To indicate the number of bytes successfully written, possibly
* fewer than the number the caller requested be written.
*
* Right now there are two versions of this function: one for Windows,
* and one for all other platforms.
*/
#if defined(CIRCLE_WINDOWS)
ssize_t perform_socket_write(socket_t desc, const char *txt, size_t length)
{
ssize_t result;
result = send(desc, txt, length, 0);
if (result > 0) {
/* Write was sucessful */
return result;
}
if (result == 0) {
/* This should never happen! */
log("SYSERR: Huh?? write() returned 0??? Please report this!");
return -1;
}
/* result < 0: An error was encountered. */
/* Transient error? */
if (WSAGetLastError() == WSAEWOULDBLOCK)
return 0;
/* Must be a fatal error. */
return -1;
}
#else
#if defined(CIRCLE_ACORN)
#define write socketwrite
#endif
/* perform_socket_write for all Non-Windows platforms */
ssize_t perform_socket_write(socket_t desc, const char *txt, size_t length)
{
ssize_t result;
result = write(desc, txt, length);
if (result > 0) {
/* Write was successful. */
return result;
}
if (result == 0) {
/* This should never happen! */
log("SYSERR: Huh?? write() returned 0??? Please report this!");
return -1;
}
/*
* result < 0, so an error was encountered - is it transient?
* Unfortunately, different systems use different constants to
* indicate this.
*/
#ifdef EAGAIN /* POSIX */
if (errno == EAGAIN)
return 0;
#endif
#ifdef EWOULDBLOCK /* BSD */
if (errno == EWOULDBLOCK)
return 0;
#endif
#ifdef EDEADLK /* Macintosh */
if (errno == EDEADLK)
return 0;
#endif
/* Looks like the error was fatal. Too bad. */
return -1;
}
#endif /* CIRCLE_WINDOWS */
/*
* write_to_descriptor takes a descriptor, and text to write to the
* descriptor. It keeps calling the system-level write() until all
* the text has been delivered to the OS, or until an error is
* encountered.
*
* Returns:
* 0 If all is well and good,
* -1 If an error was encountered, so that the player should be cut off
*/
int write_to_descriptor(socket_t desc, const char *txt)
{
size_t total;
ssize_t bytes_written;
total = strlen(txt);
while (total > 0) {
bytes_written = perform_socket_write(desc, txt, total);
if (bytes_written < 0) {
/* Fatal error. Disconnect the player. */
perror("Write to socket");
return -1;
} else if (bytes_written == 0) {
/*
* Temporary failure -- socket buffer full. For now we'll just
* cut off the player, but eventually we'll stuff the unsent
* text into a buffer and retry the write later. JE 30 June 98.
*/
log("process_output: socket write would block, about to close");
return -1;
} else {
txt += bytes_written;
total -= bytes_written;
}
}
return 0;
}
/*
* Same information about perform_socket_write applies here. I like
* standards, there are so many of them. -gg 6/30/98
*/
ssize_t perform_socket_read(socket_t desc, char *read_point, size_t space_left)
{
ssize_t ret;
#if defined(CIRCLE_ACORN)
ret = recv(desc, read_point, space_left, MSG_DONTWAIT);
#elif defined(CIRCLE_WINDOWS)
ret = recv(desc, read_point, space_left, 0);
#else
ret = read(desc, read_point, space_left);
#endif
/* Read was successful. */
if (ret > 0)
return ret;
/* read() returned 0, meaning we got an EOF. */
if (ret == 0) {
log("EOF on socket read (connection broken by peer)");
return -1;
}
/*
* read returned a value < 0: there was an error
*/
#if defined(CIRCLE_WINDOWS) /* Windows */
if (WSAGetLastError() == WSAEWOULDBLOCK)
return 0;
#else
#ifdef EINTR /* Interrupted system call - various platforms */
if (errno == EINTR)
return 0;
#endif
#ifdef EAGAIN /* POSIX */
if (errno == EAGAIN)
return 0;
#endif
#ifdef EWOULDBLOCK /* BSD */
if (errno == EWOULDBLOCK)
return 0;
#endif /* EWOULDBLOCK */
#ifdef EDEADLK /* Macintosh */
if (errno == EDEADLK)
return 0;
#endif
#endif /* CIRCLE_WINDOWS */
/* We don't know what happened, cut them off. */
perror("process_input: about to lose connection");
return -1;
}
/*
* ASSUMPTION: There will be no newlines in the raw input buffer when this
* function is called. We must maintain that before returning.
*/
int process_input(struct descriptor_data *t)
{
int buf_length, failed_subst;
ssize_t bytes_read;
size_t space_left;
char *ptr, *read_point, *write_point, *nl_pos = NULL;
char tmp[MAX_INPUT_LENGTH + 8];
/* first, find the point where we left off reading data */
buf_length = strlen(t->inbuf);
read_point = t->inbuf + buf_length;
space_left = MAX_RAW_INPUT_LENGTH - buf_length - 1;
do {
if (space_left <= 0) {
log("process_input: about to close connection: input overflow");
return -1;
}
bytes_read = perform_socket_read(t->descriptor, read_point, space_left);
if (bytes_read < 0) /* Error, disconnect them. */
return -1;
else if (bytes_read == 0) /* Just blocking, no problems. */
return 0;
/* at this point, we know we got some data from the read */
*(read_point + bytes_read) = '\0'; /* terminate the string */
/* search for a newline in the data we just read */
for (ptr = read_point; *ptr && !nl_pos; ptr++)
if (ISNEWL(*ptr))
nl_pos = ptr;
read_point += bytes_read;
space_left -= bytes_read;
/*
* on some systems such as AIX, POSIX-standard nonblocking I/O is broken,
* causing the MUD to hang when it encounters input not terminated by a
* newline. This was causing hangs at the Password: prompt, for example.
* I attempt to compensate by always returning after the _first_ read, instead
* of looping forever until a read returns -1. This simulates non-blocking
* I/O because the result is we never call read unless we know from select()
* that data is ready (process_input is only called if select indicates that
* this descriptor is in the read set). JE 2/23/95.
*/
#if !defined(POSIX_NONBLOCK_BROKEN)
} while (nl_pos == NULL);
#else
} while (0);
if (nl_pos == NULL)
return 0;
#endif /* POSIX_NONBLOCK_BROKEN */
/*
* okay, at this point we have at least one newline in the string; now we
* can copy the formatted data to a new array for further processing.
*/
read_point = t->inbuf;
while (nl_pos != NULL) {
write_point = tmp;
space_left = MAX_INPUT_LENGTH - 1;
for (ptr = read_point; (space_left > 0) && (ptr < nl_pos); ptr++) {
if (*ptr == '\b' || *ptr == 127) { /* handle backspacing or delete key */
if (write_point > tmp) {
if (*(--write_point) == '$') {
write_point--;
space_left += 2;
} else
space_left++;
}
} else if (isascii(*ptr) && isprint(*ptr)) {
if ((*(write_point++) = *ptr) == '$') { /* copy one character */
*(write_point++) = '$'; /* if it's a $, double it */
space_left -= 2;
} else
space_left--;
}
}
*write_point = '\0';
if ((space_left <= 0) && (ptr < nl_pos)) {
char buffer[MAX_INPUT_LENGTH + 64];
sprintf(buffer, "Line too long. Truncated to:\r\n%s\r\n", tmp);
if (write_to_descriptor(t->descriptor, buffer) < 0)
return -1;
}
if (t->snoop_by) {
SEND_TO_Q("% ", t->snoop_by);
SEND_TO_Q(tmp, t->snoop_by);
SEND_TO_Q("\r\n", t->snoop_by);
}
failed_subst = 0;
if (*tmp == '!' && !(*(tmp + 1))) /* Redo last command. */
strcpy(tmp, t->last_input);
else if (*tmp == '!' && *(tmp + 1)) {
char *commandln = (tmp + 1);
int starting_pos = t->history_pos,
cnt = (t->history_pos == 0 ? HISTORY_SIZE - 1 : t->history_pos - 1);
skip_spaces(&commandln);
for (; cnt != starting_pos; cnt--) {
if (t->history[cnt] && is_abbrev(commandln, t->history[cnt])) {
strcpy(tmp, t->history[cnt]);
strcpy(t->last_input, tmp);
break;
}
if (cnt == 0) /* At top, loop to bottom. */
cnt = HISTORY_SIZE;
}
} else if (*tmp == '^') {
if (!(failed_subst = perform_subst(t, t->last_input, tmp)))
strcpy(t->last_input, tmp);
} else {
strcpy(t->last_input, tmp);
if (t->history[t->history_pos])
free(t->history[t->history_pos]); /* Clear the old line. */
t->history[t->history_pos] = str_dup(tmp); /* Save the new. */
if (++t->history_pos >= HISTORY_SIZE) /* Wrap to top. */
t->history_pos = 0;
}
if (!failed_subst)
write_to_q(tmp, &t->input, 0);
/* find the end of this line */
while (ISNEWL(*nl_pos))
nl_pos++;
/* see if there's another newline in the input buffer */
read_point = ptr = nl_pos;
for (nl_pos = NULL; *ptr && !nl_pos; ptr++)
if (ISNEWL(*ptr))
nl_pos = ptr;
}
/* now move the rest of the buffer up to the beginning for the next pass */
write_point = t->inbuf;
while (*read_point)
*(write_point++) = *(read_point++);
*write_point = '\0';
return 1;
}
/* perform substitution for the '^..^' csh-esque syntax orig is the
* orig string, i.e. the one being modified. subst contains the
* substition string, i.e. "^telm^tell"
*/
int perform_subst(struct descriptor_data *t, char *orig, char *subst)
{
char newsub[MAX_INPUT_LENGTH + 5];
char *first, *second, *strpos;
/*
* first is the position of the beginning of the first string (the one
* to be replaced
*/
first = subst + 1;
/* now find the second '^' */
if (!(second = strchr(first, '^'))) {
SEND_TO_Q("Invalid substitution.\r\n", t);
return 1;
}
/* terminate "first" at the position of the '^' and make 'second' point
* to the beginning of the second string */
*(second++) = '\0';
/* now, see if the contents of the first string appear in the original */
if (!(strpos = strstr(orig, first))) {
SEND_TO_Q("Invalid substitution.\r\n", t);
return 1;
}
/* now, we construct the new string for output. */
/* first, everything in the original, up to the string to be replaced */
strncpy(newsub, orig, (strpos - orig));
newsub[(strpos - orig)] = '\0';
/* now, the replacement string */
strncat(newsub, second, (MAX_INPUT_LENGTH - strlen(newsub) - 1));
/* now, if there's anything left in the original after the string to
* replaced, copy that too. */
if (((strpos - orig) + strlen(first)) < strlen(orig))
strncat(newsub, strpos + strlen(first), (MAX_INPUT_LENGTH - strlen(newsub) - 1));
/* terminate the string in case of an overflow from strncat */
newsub[MAX_INPUT_LENGTH - 1] = '\0';
strcpy(subst, newsub);
return 0;
}
void close_socket(struct descriptor_data *d)
{
char buf[128];
struct descriptor_data *temp;
REMOVE_FROM_LIST(d, descriptor_list, next);
CLOSE_SOCKET(d->descriptor);
flush_queues(d);
/* Forget snooping */
if (d->snooping)
d->snooping->snoop_by = NULL;
if (d->snoop_by) {
SEND_TO_Q("Your victim is no longer among us.\r\n", d->snoop_by);
d->snoop_by->snooping = NULL;
}
/*. Kill any OLC stuff .*/
switch(d->connected) {
case CON_OEDIT:
case CON_REDIT:
case CON_ZEDIT:
case CON_MEDIT:
case CON_SEDIT:
case CON_HEDIT:
case CON_AEDIT:
case CON_TRIGEDIT:
cleanup_olc(d, CLEANUP_ALL);
default:
break;
}
if (d->character) {
/*
* Plug memory leak, from Eric Green.
*/
if (PLR_FLAGGED(d->character, PLR_MAILING) && d->str) {
if (*(d->str))
free(*(d->str));
free(d->str);
}
if (STATE(d) == CON_PLAYING || STATE(d) == CON_DISCONNECT) {
save_char(d->character, NOWHERE);
act("$n has lost $s link.", TRUE, d->character, 0, 0, TO_ROOM);
sprintf(buf, "Closing link to: %s.", GET_NAME(d->character));
mudlog(buf, NRM, MAX(LVL_IMMORT, GET_INVIS_LEV(d->character)), TRUE);
d->character->desc = NULL;
} else {
sprintf(buf, "Losing player: %s.",
GET_NAME(d->character) ? GET_NAME(d->character) : "<null>");
mudlog(buf, CMP, LVL_IMMORT, TRUE);
free_char(d->character);
}
} else
mudlog("Losing descriptor without char.", CMP, LVL_IMMORT, TRUE);
/* JE 2/22/95 -- part of my unending quest to make switch stable */
if (d->original && d->original->desc)
d->original->desc = NULL;
/* Clear the command history. */
if (d->history) {
int cnt;
for (cnt = 0; cnt < HISTORY_SIZE; cnt++)
if (d->history[cnt])
free(d->history[cnt]);
free(d->history);
}
if (d->showstr_head)
free(d->showstr_head);
if (d->showstr_count)
free(d->showstr_vector);
free(d);
}
void check_idle_passwords(void)
{
struct descriptor_data *d, *next_d;
for (d = descriptor_list; d; d = next_d) {
next_d = d->next;
if (STATE(d) != CON_PASSWORD && STATE(d) != CON_GET_NAME)
continue;
if (!d->idle_tics) {
d->idle_tics++;
continue;
} else {
echo_on(d);
SEND_TO_Q("\r\nTimed out... goodbye.\r\n", d);
STATE(d) = CON_CLOSE;
}
}
}
/*
* I tried to universally convert Circle over to POSIX compliance, but
* alas, some systems are still straggling behind and don't have all the
* appropriate defines. In particular, NeXT 2.x defines O_NDELAY but not
* O_NONBLOCK. Krusty old NeXT machines! (Thanks to Michael Jones for
* this and various other NeXT fixes.)
*/
#if defined(CIRCLE_WINDOWS)
void nonblock(socket_t s)
{
long val;
val = 1;
ioctlsocket(s, FIONBIO, &val);
}
#elif defined(CIRCLE_AMIGA)
void nonblock(socket_t s)
{
long val;
val = 1;
IoctlSocket(s, FIONBIO, &val);
}
#elif defined(CIRCLE_ACORN)
void nonblock(socket_t s)
{
int val = 1;
socket_ioctl(s, FIONBIO, &val);
}
#elif defined(CIRCLE_UNIX) || defined(CIRCLE_OS2) || defined(CIRCLE_MACINTOSH)
#ifndef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
void nonblock(socket_t s)
{
int flags;
flags = fcntl(s, F_GETFL, 0);
flags |= O_NONBLOCK;
if (fcntl(s, F_SETFL, flags) < 0) {
perror("SYSERR: Fatal error executing nonblock (comm.c)");
exit(1);
}
}
#endif /* CIRCLE_UNIX || CIRCLE_OS2 || CIRCLE_MACINTOSH */
/* ******************************************************************
* signal-handling functions (formerly signals.c). UNIX only. *
****************************************************************** */
#if defined(CIRCLE_UNIX) || defined(CIRCLE_MACINTOSH)
RETSIGTYPE reread_wizlists(int sig)
{
mudlog("Signal received - rereading wizlists.", CMP, LVL_IMMORT, TRUE);
reboot_wizlists();
}
RETSIGTYPE unrestrict_game(int sig)
{
mudlog("Received SIGUSR2 - completely unrestricting game (emergent)",
BRF, LVL_IMMORT, TRUE);
ban_list = NULL;
circle_restrict = 0;
num_invalid = 0;
}
#ifdef CIRCLE_UNIX
/* clean up our zombie kids to avoid defunct processes */
RETSIGTYPE reap(int sig)
{
while (waitpid(-1, NULL, WNOHANG) > 0);
my_signal(SIGCHLD, reap);
}
RETSIGTYPE checkpointing(int sig)
{
if (!tics) {
log("SYSERR: CHECKPOINT shutdown: tics not updated. (Infinite loop suspected)");
abort();
} else
tics = 0;
}
RETSIGTYPE hupsig(int sig)
{
log("SYSERR: Received SIGHUP, SIGINT, or SIGTERM. Shutting down...");
exit(1); /* perhaps something more elegant should
* substituted */
}
/*
* This is an implementation of signal() using sigaction() for portability.
* (sigaction() is POSIX; signal() is not.) Taken from Stevens' _Advanced
* Programming in the UNIX Environment_. We are specifying that all system
* calls _not_ be automatically restarted for uniformity, because BSD systems
* do not restart select(), even if SA_RESTART is used.
*
* Note that NeXT 2.x is not POSIX and does not have sigaction; therefore,
* I just define it to be the old signal. If your system doesn't have
* sigaction either, you can use the same fix.
*
* SunOS Release 4.0.2 (sun386) needs this too, according to Tim Aldric.
*/
#ifndef POSIX
#define my_signal(signo, func) signal(signo, func)
#else
sigfunc *my_signal(int signo, sigfunc * func)
{
struct sigaction act, oact;
act.sa_handler = func;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
#ifdef SA_INTERRUPT
act.sa_flags |= SA_INTERRUPT; /* SunOS */
#endif
if (sigaction(signo, &act, &oact) < 0)
return SIG_ERR;
return oact.sa_handler;
}
#endif /* POSIX */
void signal_setup(void)
{
#ifndef CIRCLE_MACINTOSH
struct itimerval itime;
struct timeval interval;
/* user signal 1: reread wizlists. Used by autowiz system. */
my_signal(SIGUSR1, reread_wizlists);
/*
* user signal 2: unrestrict game. Used for emergencies if you lock
* yourself out of the MUD somehow. (Duh...)
*/
my_signal(SIGUSR2, unrestrict_game);
/*
* set up the deadlock-protection so that the MUD aborts itself if it gets
* caught in an infinite loop for more than 3 minutes.
*/
interval.tv_sec = 180;
interval.tv_usec = 0;
itime.it_interval = interval;
itime.it_value = interval;
setitimer(ITIMER_VIRTUAL, &itime, NULL);
my_signal(SIGVTALRM, checkpointing);
/* just to be on the safe side: */
my_signal(SIGHUP, hupsig);
my_signal(SIGCHLD, reap);
#endif /* CIRCLE_MACINTOSH */
my_signal(SIGINT, hupsig);
my_signal(SIGTERM, hupsig);
my_signal(SIGPIPE, SIG_IGN);
my_signal(SIGALRM, SIG_IGN);
}
#endif /* CIRCLE_UNIX */
#endif /* CIRCLE_UNIX || CIRCLE_MACINTOSH */
/* ****************************************************************
* Public routines for system-to-player-communication *
**************************************************************** */
void send_to_char(const char *messg, struct char_data *ch)
{
if (ch->desc && messg)
SEND_TO_Q(messg, ch->desc);
}
void send_to_all(const char *messg)
{
struct descriptor_data *i;
if (messg == NULL)
return;
for (i = descriptor_list; i; i = i->next)
if (STATE(i) == CON_PLAYING)
SEND_TO_Q(messg, i);
}
void send_to_outdoor(const char *messg)
{
struct descriptor_data *i;
if (!messg || !*messg)
return;
for (i = descriptor_list; i; i = i->next) {
if (STATE(i) != CON_PLAYING || i->character == NULL)
continue;
if (!AWAKE(i->character) || !OUTSIDE(i->character))
continue;
SEND_TO_Q(messg, i);
}
}
void send_to_room(const char *messg, int room)
{
struct char_data *i;
if (messg == NULL)
return;
for (i = world[room].people; i; i = i->next_in_room)
if (i->desc)
SEND_TO_Q(messg, i->desc);
}
const char *ACTNULL = "<NULL>";
#define CHECK_NULL(pointer, expression) \
if ((pointer) == NULL) i = ACTNULL; else i = (expression);
/* higher-level communication: the act() function */
void perform_act(const char *orig, struct char_data *ch, struct obj_data *obj,
const void *vict_obj, struct char_data *to)
{
const char *i = NULL;
char lbuf[MAX_STRING_LENGTH], *buf;
struct char_data *dg_victim = NULL;
struct obj_data *dg_target = NULL;
char *dg_arg = NULL;
buf = lbuf;
for (;;) {
if (*orig == '$') {
switch (*(++orig)) {
case 'n':
i = PERS(ch, to);
break;
case 'N':
CHECK_NULL(vict_obj, PERS((struct char_data *) vict_obj, to));
dg_victim = (struct char_data *) vict_obj;
break;
case 'm':
i = HMHR(ch);
break;
case 'M':
CHECK_NULL(vict_obj, HMHR((struct char_data *) vict_obj));
dg_victim = (struct char_data *) vict_obj;
break;
case 's':
i = HSHR(ch);
break;
case 'S':
CHECK_NULL(vict_obj, HSHR((struct char_data *) vict_obj));
dg_victim = (struct char_data *) vict_obj;
break;
case 'e':
i = HSSH(ch);
break;
case 'E':
CHECK_NULL(vict_obj, HSSH((struct char_data *) vict_obj));
dg_victim = (struct char_data *) vict_obj;
break;
case 'o':
CHECK_NULL(obj, OBJN(obj, to));
break;
case 'O':
CHECK_NULL(vict_obj, OBJN((struct obj_data *) vict_obj, to));
dg_target = (struct obj_data *) vict_obj;
break;
case 'p':
CHECK_NULL(obj, OBJS(obj, to));
break;
case 'P':
CHECK_NULL(vict_obj, OBJS((struct obj_data *) vict_obj, to));
dg_target = (struct obj_data *) vict_obj;
break;
case 'a':
CHECK_NULL(obj, SANA(obj));
break;
case 'A':
CHECK_NULL(vict_obj, SANA((struct obj_data *) vict_obj));
dg_target = (struct obj_data *) vict_obj;
break;
case 'T':
CHECK_NULL(vict_obj, (char *) vict_obj);
dg_arg = (char *) vict_obj;
break;
case 't':
CHECK_NULL(obj, (char *) obj);
break;
case 'F':
CHECK_NULL(vict_obj, fname((char *) vict_obj));
break;
case '$':
i = "$";
break;
default:
log("SYSERR: Illegal $-code to act(): %c", *orig);
log("SYSERR: %s", orig);
break;
}
while ((*buf = *(i++)))
buf++;
orig++;
} else if (!(*(buf++) = *(orig++)))
break;
}
*(--buf) = '\r';
*(++buf) = '\n';
*(++buf) = '\0';
if (to->desc)
SEND_TO_Q(CAP(lbuf), to->desc);
if ((IS_NPC(to) && dg_act_check) && (to != ch))
act_mtrigger(to, lbuf, ch, dg_victim, obj, dg_target, dg_arg);
}
/* moved this to utils.h --- mah */
#ifndef SENDOK
#define SENDOK(ch) ((ch)->desc && (to_sleeping || AWAKE(ch)) && \
!PLR_FLAGGED((ch), PLR_WRITING))
#endif
void act(const char *str, int hide_invisible, struct char_data *ch,
struct obj_data *obj, const void *vict_obj, int type)
{
struct char_data *to = NULL;
int to_sleeping;
if (!str || !*str)
return;
if (!(dg_act_check = !(type & DG_NO_TRIG)))
type &= ~DG_NO_TRIG;
/*
* Warning: the following TO_SLEEP code is a hack.
*
* I wanted to be able to tell act to deliver a message regardless of sleep
* without adding an additional argument. TO_SLEEP is 128 (a single bit
* high up). It's ONLY legal to combine TO_SLEEP with one other TO_x
* command. It's not legal to combine TO_x's with each other otherwise.
* TO_SLEEP only works because its value "happens to be" a single bit;
* do not change it to something else. In short, it is a hack.
*/
/* check if TO_SLEEP is there, and remove it if it is. */
if ((to_sleeping = (type & TO_SLEEP)))
type &= ~TO_SLEEP;
if (type == TO_CHAR) {
if (ch && SENDOK(ch))
perform_act(str, ch, obj, vict_obj, ch);
return;
}
if (type == TO_VICT) {
if ((to = (struct char_data *) vict_obj) && SENDOK(to))
perform_act(str, ch, obj, vict_obj, to);
return;
}
/* ASSUMPTION: at this point we know type must be TO_NOTVICT or TO_ROOM */
if (ch && ch->in_room != NOWHERE)
to = world[ch->in_room].people;
else if (obj && obj->in_room != NOWHERE)
to = world[obj->in_room].people;
else {
log("SYSERR: no valid target to act()!");
return;
}
for (; to; to = to->next_in_room) {
if (!SENDOK(to) || (to == ch))
continue;
if (hide_invisible && ch && !CAN_SEE(to, ch))
continue;
if (type != TO_ROOM && to == vict_obj)
continue;
perform_act(str, ch, obj, vict_obj, to);
}
}
/*
* This function is called every 30 seconds from heartbeat(). It checks
* the four global buffers in CircleMUD to ensure that no one has written
* past their bounds. If our check digit is not there (and the position
* doesn't have a NUL which may result from snprintf) then we gripe that
* someone has overwritten our buffer. This could cause a false positive
* if someone uses the buffer as a non-terminated character array but that
* is not likely. -gg
*/
#define offset (MAX_STRING_LENGTH - 1)
void sanity_check(void)
{
int ok = TRUE;
/*
* If any line is false, 'ok' will become false also.
*/
ok &= (buf[offset] == MAGIC_NUMBER || buf[offset] == '\0');
ok &= (buf1[offset] == MAGIC_NUMBER || buf1[offset] == '\0');
ok &= (buf2[offset] == MAGIC_NUMBER || buf2[offset] == '\0');
ok &= (arg[offset] == MAGIC_NUMBER || arg[offset] == '\0');
/*
* This isn't exactly the safest thing to do (referencing known bad memory)
* but we're doomed to crash eventually, might as well try to get something
* useful before we go down. -gg
*/
if (!ok)
log("SYSERR: *** Buffer overflow! ***\n"
"buf: %s\nbuf1: %s\nbuf2: %s\narg: %s", buf, buf1, buf2, arg);
#if 0
log("Statistics: buf=%d buf1=%d buf2=%d arg=%d",
strlen(buf), strlen(buf1), strlen(buf2), strlen(arg));
#endif
}