/* ************************************************************************
* 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"
#if CIRCLE_GNU_LIBC_MEMORY_TRACK
# include <mcheck.h>
#endif
#ifdef CIRCLE_MACINTOSH /* Includes for the Macintosh */
# define SIGPIPE 13
# define SIGALRM 14
/* GUSI headers */
# include <sys/ioctl.h>
/* Codewarrior 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 "utils.h"
#include "comm.h"
#include "interpreter.h"
#include "handler.h"
#include "db.h"
#include "house.h"
#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 *GREETINGS;
extern const char *circlemud_version;
extern int circle_restrict;
extern int mini_mud;
extern int no_rent_check;
extern FILE *player_fl;
extern ush_int DFLT_PORT;
extern const char *DFLT_DIR;
extern const char *DFLT_IP;
extern const char *LOGNAME;
extern int max_playing;
extern int nameserver_is_slow; /* see config.c */
extern int auto_save; /* see config.c */
extern int autosave_time; /* see config.c */
extern int *cmd_sort_info;
extern struct time_info_data time_info; /* In db.c */
extern char *help;
/* 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 */
struct timeval null_time; /* zero-valued time structure */
byte reread_wizlist; /* signal: SIGUSR1 */
byte emergency_unban; /* signal: SIGUSR2 */
FILE *logfile = NULL; /* Where to send the log messages. */
const char *text_overflow = "**OVERFLOW**\r\n";
/* 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 circle_sleep(struct timeval *timeout);
int get_from_q(struct txt_q *queue, char *dest, int *aliased);
void init_game(ush_int port);
void signal_setup(void);
void game_loop(socket_t mother_desc);
socket_t init_socket(ush_int port);
int new_descriptor(socket_t s);
int get_max_players(void);
int process_output(struct descriptor_data *t);
int process_input(struct descriptor_data *t);
void timediff(struct timeval *diff, struct timeval *a, struct timeval *b);
void timeadd(struct timeval *sum, 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);
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);
void setup_log(const char *filename, int fd);
int open_logfile(const char *filename, FILE *stderr_fp);
#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 magic.c */
void mobile_activity(void);
void perform_violence(void);
void show_string(struct descriptor_data *d, char *input);
int isbanned(char *hostname);
void weather_and_time(int mode);
int perform_alias(struct descriptor_data *d, char *orig, size_t maxlen);
void clear_free_list(void);
void free_messages(void);
void Board_clear_all(void);
void free_social_messages(void);
void Free_Invalid_List(void);
#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.
* Borland C++ warns: "Undefined structure 'timezone'"
*/
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)
{
ush_int port;
int pos = 1;
const char *dir;
#if CIRCLE_GNU_LIBC_MEMORY_TRACK
mtrace(); /* This must come before any use of malloc(). */
#endif
#ifdef CIRCLE_MACINTOSH
/*
* ccommand() calls the command line/io redirection dialog box from
* Codewarriors's SIOUX library
*/
argc = ccommand(&argv);
/* Initialize the GUSI library calls. */
GUSIDefaultSetup();
#endif
port = DFLT_PORT;
dir = DFLT_DIR;
while ((pos < argc) && (*(argv[pos]) == '-')) {
switch (*(argv[pos] + 1)) {
case 'o':
if (*(argv[pos] + 2))
LOGNAME = argv[pos] + 2;
else if (++pos < argc)
LOGNAME = argv[pos];
else {
puts("SYSERR: File name to log to expected after option -o.");
exit(1);
}
break;
case 'd':
if (*(argv[pos] + 2))
dir = argv[pos] + 2;
else if (++pos < argc)
dir = argv[pos];
else {
puts("SYSERR: Directory arg expected after option -d.");
exit(1);
}
break;
case 'm':
mini_mud = 1;
no_rent_check = 1;
puts("Running in minimized mode & with no rent check.");
break;
case 'c':
scheck = 1;
puts("Syntax check mode enabled.");
break;
case 'q':
no_rent_check = 1;
puts("Quick boot mode -- rent check supressed.");
break;
case 'r':
circle_restrict = 1;
puts("Restricting game -- no new players allowed.");
break;
case 's':
no_specials = 1;
puts("Suppressing assignment of special routines.");
break;
case 'h':
/* From: Anil Mahajan <amahajan@proxicom.com> */
printf("Usage: %s [-c] [-m] [-q] [-r] [-s] [-d pathname] [port #]\n"
" -c Enable syntax check mode.\n"
" -d <directory> Specify library directory (defaults to 'lib').\n"
" -h Print this command line argument help.\n"
" -m Start in mini-MUD mode.\n"
" -o <file> Write log to <file> instead of stderr.\n"
" -q Quick boot (doesn't scan rent for object limits)\n"
" -r Restrict MUD -- no new players allowed.\n"
" -s Suppress special procedure assignments.\n",
argv[0]
);
exit(0);
default:
printf("SYSERR: Unknown option -%c in argument string.\n", *(argv[pos] + 1));
break;
}
pos++;
}
if (pos < argc) {
if (!isdigit(*argv[pos])) {
printf("Usage: %s [-c] [-m] [-q] [-r] [-s] [-d pathname] [port #]\n", argv[0]);
exit(1);
} else if ((port = atoi(argv[pos])) <= 1024) {
printf("SYSERR: Illegal port number %d.\n", port);
exit(1);
}
}
/* All arguments have been parsed, try to open log file. */
setup_log(LOGNAME, STDERR_FILENO);
/*
* Moved here to distinguish command line options and to show up
* in the log if stderr is redirected to a file.
*/
log("%s", circlemud_version);
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();
else {
log("Running game on port %d.", port);
init_game(port);
}
log("Clearing game world.");
destroy_db();
if (!scheck) {
log("Clearing other memory.");
free_player_index(); /* db.c */
free_messages(); /* fight.c */
clear_free_list(); /* mail.c */
free_text_files(); /* db.c */
Board_clear_all(); /* boards.c */
free(cmd_sort_info); /* act.informative.c */
free_social_messages(); /* act.social.c */
free_help(); /* db.c */
Free_Invalid_List(); /* ban.c */
}
log("Done.");
return (0);
}
/* Init sockets, run game, and cleanup sockets */
void init_game(ush_int port)
{
socket_t 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();
#if defined(CIRCLE_UNIX) || defined(CIRCLE_MACINTOSH)
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);
Crash_save_all();
log("Closing all sockets.");
while (descriptor_list)
close_socket(descriptor_list);
CLOSE_SOCKET(mother_desc);
fclose(player_fl);
log("Saving current MUD time.");
save_mud_time(&time_info);
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.
*/
socket_t init_socket(ush_int port)
{
socket_t s;
struct sockaddr_in sa;
int opt;
#ifdef CIRCLE_WINDOWS
{
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(1, 1);
if (WSAStartup(wVersionRequested, &wsaData) != 0) {
log("SYSERR: WinSock not available!");
exit(1);
}
/*
* 4 = stdin, stdout, stderr, mother_desc. Windows might
* keep sockets and files separate, in which case this isn't
* necessary, but we will err on the side of caution.
*/
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);
/*
* The GUSI sockets library is derived from BSD, so it defines
* SO_LINGER, even though setsockopt() is unimplimented.
* (from Dean Takemori <dean@UHHEPH.PHYS.HAWAII.EDU>)
*/
#if defined(SO_LINGER) && !defined(CIRCLE_MACINTOSH)
{
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 SO_LINGER"); /* Not fatal I suppose. */
}
#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_playing);
#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_playing + NUM_RESERVED_DESCS;
else
max_descs = MIN(max_playing + NUM_RESERVED_DESCS, limit.rlim_max);
#else
max_descs = MIN(max_playing + 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_playing + 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_playing + NUM_RESERVED_DESCS;
#endif
/* now calculate max _players_ based on max descs */
max_descs = MIN(max_playing, 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(socket_t mother_desc)
{
fd_set input_set, output_set, exc_set, null_set;
struct timeval last_time, opt_time, process_time, temp_time;
struct timeval before_sleep, now, timeout;
char comm[MAX_INPUT_LENGTH];
struct descriptor_data *d, *next_d;
int pulse = 0, missed_pulses, 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("SYSERR: 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 */
timediff(&process_time, &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 */
timediff(&temp_time, &opt_time, &process_time);
timeadd(&last_time, &before_sleep, &temp_time);
/* Now keep sleeping until that time has come */
gettimeofday(&now, (struct timezone *) 0);
timediff(&timeout, &last_time, &now);
/* Go to sleep */
do {
circle_sleep(&timeout);
gettimeofday(&now, (struct timezone *) 0);
timediff(&timeout, &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("SYSERR: 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
* If no wait state, no subtraction. If there is a wait
* state then 1 is subtracted. Therefore we don't go less
* than 0 ever and don't require an 'if' bracket. -gg 2/27/99
*/
if (d->character) {
GET_WAIT_STATE(d->character) -= (GET_WAIT_STATE(d->character) > 0);
if (GET_WAIT_STATE(d->character))
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 (IN_ROOM(d->character) != 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);
}
GET_WAIT_STATE(d->character) = 1;
}
d->has_prompt = FALSE;
if (d->str) /* Writing boards, mail, etc. */
string_add(d, comm);
else if (d->showstr_count) /* Reading something w/ pager */
show_string(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 = TRUE; /* To get newline before next cmd output. */
else if (perform_alias(d, comm, sizeof(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. */
process_output(d);
if (d->bufptr == 0) /* All output sent. */
d->has_prompt = TRUE;
}
}
/* Print prompts for other descriptors who had no other output */
for (d = descriptor_list; d; d = d->next) {
if (!d->has_prompt && d->bufptr == 0) {
write_to_descriptor(d->descriptor, make_prompt(d));
d->has_prompt = TRUE;
}
}
/* 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 RL_SEC) {
log("SYSERR: Missed %d seconds worth of pulses.", missed_pulses / PASSES_PER_SEC);
missed_pulses = 30 RL_SEC;
}
/* Now execute the heartbeat functions */
while (missed_pulses--)
heartbeat(++pulse);
/* Check for any signals we may have received. */
if (reread_wizlist) {
reread_wizlist = FALSE;
mudlog(CMP, LVL_IMMORT, TRUE, "Signal received - rereading wizlists.");
reboot_wizlists();
}
if (emergency_unban) {
emergency_unban = FALSE;
mudlog(BRF, LVL_IMMORT, TRUE, "Received SIGUSR2 - completely unrestricting game (emergent)");
ban_list = NULL;
circle_restrict = 0;
num_invalid = 0;
}
/* Roll pulse over after 10 hours */
if (pulse >= (10 * 60 * 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;
if (!(pulse % PULSE_ZONE))
zone_update();
if (!(pulse % PULSE_IDLEPWD)) /* 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 % PULSE_AUTOSAVE)) { /* 1 minute */
if (++mins_since_crashsave >= autosave_time) {
mins_since_crashsave = 0;
Crash_save_all();
House_save_all();
}
}
if (!(pulse % PULSE_USAGE))
record_usage();
if (!(pulse % PULSE_TIMESAVE))
save_mud_time(&time_info);
/* Every pulse! Don't want them to stink the place up... */
extract_pending_chars();
}
/* ******************************************************************
* 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).
*/
void timediff(struct timeval *rslt, struct timeval *a, struct timeval *b)
{
if (a->tv_sec < b->tv_sec)
*rslt = null_time;
else if (a->tv_sec == b->tv_sec) {
if (a->tv_usec < b->tv_usec)
*rslt = null_time;
else {
rslt->tv_sec = 0;
rslt->tv_usec = a->tv_usec - b->tv_usec;
}
} 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;
}
}
/*
* Add 2 time values.
*
* Patch sent by "d. hall" <dhall@OOI.NET> to fix 'static' usage.
*/
void timeadd(struct timeval *rslt, struct timeval *a, struct timeval *b)
{
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++;
}
}
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 /* Not RUSAGE_SELF because it doesn't guarantee prototype. */
{
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,
};
write_to_output(d, "%s", off_string);
}
/*
* 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) 0
};
write_to_output(d, "%s", on_string);
}
char *make_prompt(struct descriptor_data *d)
{
static char prompt[MAX_PROMPT_LENGTH];
/* Note, prompt is truncated at MAX_PROMPT_LENGTH chars (structs.h) */
if (d->str)
strcpy(prompt, "] "); /* strcpy: OK (for 'MAX_PROMPT_LENGTH >= 3') */
else if (d->showstr_count) {
snprintf(prompt, sizeof(prompt),
"\r\n[ Return to continue, (q)uit, (r)efresh, (b)ack, or page number (%d/%d) ]",
d->showstr_page, d->showstr_count);
} else if (STATE(d) == CON_PLAYING && !IS_NPC(d->character)) {
int count;
size_t len = 0;
*prompt = '\0';
if (GET_INVIS_LEV(d->character) && len < sizeof(prompt)) {
count = snprintf(prompt + len, sizeof(prompt) - len, "i%d ", GET_INVIS_LEV(d->character));
if (count >= 0)
len += count;
}
if (PRF_FLAGGED(d->character, PRF_DISPHP) && len < sizeof(prompt)) {
count = snprintf(prompt + len, sizeof(prompt) - len, "%dH ", GET_HIT(d->character));
if (count >= 0)
len += count;
}
if (PRF_FLAGGED(d->character, PRF_DISPMANA) && len < sizeof(prompt)) {
count = snprintf(prompt + len, sizeof(prompt) - len, "%dM ", GET_MANA(d->character));
if (count >= 0)
len += count;
}
if (PRF_FLAGGED(d->character, PRF_DISPMOVE) && len < sizeof(prompt)) {
count = snprintf(prompt + len, sizeof(prompt) - len, "%dV ", GET_MOVE(d->character));
if (count >= 0)
len += count;
}
if (len < sizeof(prompt))
strncat(prompt, "> ", sizeof(prompt) - len - 1); /* strncat: OK */
} else if (STATE(d) == CON_PLAYING && IS_NPC(d->character))
snprintf(prompt, sizeof(prompt), "%s> ", GET_NAME(d->character));
else
*prompt = '\0';
return (prompt);
}
/*
* NOTE: 'txt' must be at most MAX_INPUT_LENGTH big.
*/
void write_to_q(const char *txt, struct txt_q *queue, int aliased)
{
struct txt_block *newt;
CREATE(newt, struct txt_block, 1);
newt->text = strdup(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;
}
}
/*
* NOTE: 'dest' must be at least MAX_INPUT_LENGTH big.
*/
int get_from_q(struct txt_q *queue, char *dest, int *aliased)
{
struct txt_block *tmp;
/* queue empty? */
if (!queue->head)
return (0);
strcpy(dest, queue->head->text); /* strcpy: OK (mutual MAX_INPUT_LENGTH) */
*aliased = queue->head->aliased;
tmp = queue->head;
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)
{
if (d->large_outbuf) {
d->large_outbuf->next = bufpool;
bufpool = d->large_outbuf;
}
while (d->input.head) {
struct txt_block *tmp = d->input.head;
d->input.head = d->input.head->next;
free(tmp->text);
free(tmp);
}
}
/* Add a new string to a player's output queue. For outside use. */
size_t write_to_output(struct descriptor_data *t, const char *txt, ...)
{
va_list args;
size_t left;
va_start(args, txt);
left = vwrite_to_output(t, txt, args);
va_end(args);
return left;
}
/* Add a new string to a player's output queue. */
size_t vwrite_to_output(struct descriptor_data *t, const char *format, va_list args)
{
static char txt[MAX_STRING_LENGTH];
size_t wantsize;
int size;
/* if we're in the overflow state already, ignore this new output */
if (t->bufspace == 0)
return (0);
wantsize = size = vsnprintf(txt, sizeof(txt), format, args);
/* If exceeding the size of the buffer, truncate it for the overflow message */
if (size < 0 || wantsize >= sizeof(txt)) {
size = sizeof(txt) - 1;
strcpy(txt + size - strlen(text_overflow), text_overflow); /* strcpy: OK */
}
/*
* If the text is too big to fit into even a large buffer, truncate
* the new text to make it fit. (This will switch to the overflow
* state automatically because t->bufspace will end up 0.)
*/
if (size + t->bufptr + 1 > LARGE_BUFSIZE) {
size = LARGE_BUFSIZE - t->bufptr - 1;
txt[size] = '\0';
buf_overflows++;
}
/*
* If we have enough space, just write to buffer and that's it! If the
* text just barely fits, then it's switched to a large buffer instead.
*/
if (t->bufspace > size) {
strcpy(t->output + t->bufptr, txt); /* strcpy: OK (size checked above) */
t->bufspace -= size;
t->bufptr += size;
return (t->bufspace);
}
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); /* strcpy: OK (size checked previously) */
t->output = t->large_outbuf->text; /* make big buffer primary */
strcat(t->output, txt); /* strcat: OK (size checked) */
/* 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;
return (t->bufspace);
}
/* ******************************************************************
* 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 "
"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(socket_t s)
{
socket_t desc;
int sockets_connected = 0;
socklen_t 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("SYSERR: 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);
/* 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("SYSERR: gethostbyaddr");
/* find the numeric site address */
strncpy(newd->host, (char *)inet_ntoa(peer.sin_addr), HOST_LENGTH); /* strncpy: OK (n->host:HOST_LENGTH+1) */
*(newd->host + HOST_LENGTH) = '\0';
} else {
strncpy(newd->host, from->h_name, HOST_LENGTH); /* strncpy: OK (n->host:HOST_LENGTH+1) */
*(newd->host + HOST_LENGTH) = '\0';
}
/* determine if the site is banned */
if (isbanned(newd->host) == BAN_ALL) {
CLOSE_SOCKET(desc);
mudlog(CMP, LVL_GOD, TRUE, "Connection attempt denied from [%s]", newd->host);
free(newd);
return (0);
}
#if 0
/*
* Log new connections - probably unnecessary, but you may want it.
* Note that your immortals may wonder if they see a connection from
* your site, but you are wizinvis upon login.
*/
mudlog(CMP, LVL_GOD, FALSE, "New connection from [%s]", newd->host);
#endif
/* initialize descriptor data */
newd->descriptor = desc;
newd->idle_tics = 0;
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 */
STATE(newd) = CON_GET_NAME;
/*
* 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;
write_to_output(newd, "%s", GREETINGS);
return (0);
}
/*
* Send all of the output that we've accumulated for a player out to
* the player's descriptor.
*
* 32 byte GARBAGE_SPACE in MAX_SOCK_BUF used for:
* 2 bytes: prepended \r\n
* 14 bytes: overflow message
* 2 bytes: extra \r\n for non-comapct
* 14 bytes: unused
*/
int process_output(struct descriptor_data *t)
{
char i[MAX_SOCK_BUF], *osb = i + 2;
int result;
/* we may need this \r\n for later -- see below */
strcpy(i, "\r\n"); /* strcpy: OK (for 'MAX_SOCK_BUF >= 3') */
/* now, append the 'real' output */
strcpy(osb, t->output); /* strcpy: OK (t->output:LARGE_BUFSIZE < osb:MAX_SOCK_BUF-2) */
/* if we're in the overflow state, notify the user */
if (t->bufspace == 0)
strcat(osb, "**OVERFLOW**\r\n"); /* strcpy: OK (osb:MAX_SOCK_BUF-2 reserves space) */
/* 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(osb, "\r\n"); /* strcpy: OK (osb:MAX_SOCK_BUF-2 reserves space) */
/* add a prompt */
strcat(i, make_prompt(t)); /* strcpy: OK (i:MAX_SOCK_BUF reserves space) */
/*
* 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->has_prompt = FALSE;
result = write_to_descriptor(t->descriptor, i);
if (result >= 2)
result -= 2;
} else
result = write_to_descriptor(t->descriptor, osb);
if (result < 0) { /* Oops, fatal error. Bye! */
close_socket(t);
return (-1);
} else if (result == 0) /* Socket buffer full. Try later. */
return (0);
/* Handle snooping: prepend "% " and send to snooper. */
if (t->snoop_by)
write_to_output(t->snoop_by, "%% %*s%%%%", result, t->output);
/* The common case: all saved output was handed off to the kernel buffer. */
if (result >= t->bufptr) {
/*
* 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';
/*
* If the overflow message or prompt were partially written, try to save
* them. There will be enough space for them if this is true. 'result'
* is effectively unsigned here anyway.
*/
if ((unsigned int)result < strlen(osb)) {
size_t savetextlen = strlen(osb + result);
strcat(t->output, osb + result);
t->bufptr -= savetextlen;
t->bufspace += savetextlen;
}
} else {
/* Not all data in buffer sent. result < output buffersize. */
strcpy(t->output, t->output + result); /* strcpy: OK (overlap) */
t->bufptr -= result;
t->bufspace += result;
}
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 || WSAGetLastError() == WSAEINTR)
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)
{
ssize_t bytes_written;
size_t total = strlen(txt), write_total = 0;
while (total > 0) {
bytes_written = perform_socket_write(desc, txt, total);
if (bytes_written < 0) {
/* Fatal error. Disconnect the player. */
perror("SYSERR: Write to socket");
return (-1);
} else if (bytes_written == 0) {
/* Temporary failure -- socket buffer full. */
return (write_total);
} else {
txt += bytes_written;
total -= bytes_written;
write_total += bytes_written;
}
}
return (write_total);
}
/*
* 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("WARNING: 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 || WSAGetLastError() == WSAEINTR)
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
#ifdef ECONNRESET
if (errno == ECONNRESET)
return (-1);
#endif
#endif /* CIRCLE_WINDOWS */
/*
* We don't know what happened, cut them off. This qualifies for
* a SYSERR because we have no idea what happened at this point.
*/
perror("SYSERR: perform_socket_read: 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.
*
* Ever wonder why 'tmp' had '+8' on it? The crusty old code could write
* MAX_INPUT_LENGTH+1 bytes to 'tmp' if there was a '$' as the final
* character in the input buffer. This would also cause 'space_left' to
* drop to -1, which wasn't very happy in an unsigned variable. Argh.
* So to fix the above, 'tmp' lost the '+8' since it doesn't need it
* and the code has been changed to reserve space by accepting one less
* character. (Do you really need 256 characters on a line?)
* -gg 1/21/2000
*/
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];
/* 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("WARNING: 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;
/* The '> 1' reserves room for a '$ => $$' expansion. */
for (ptr = read_point; (space_left > 1) && (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];
snprintf(buffer, sizeof(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)
write_to_output(t->snoop_by, "%% %s\r\n", tmp);
failed_subst = 0;
if (*tmp == '!' && !(*(tmp + 1))) /* Redo last command. */
strcpy(tmp, t->last_input); /* strcpy: OK (by mutual MAX_INPUT_LENGTH) */
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: OK (by mutual MAX_INPUT_LENGTH) */
strcpy(t->last_input, tmp); /* strcpy: OK (by mutual MAX_INPUT_LENGTH) */
write_to_output(t, "%s\r\n", 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); /* strcpy: OK (by mutual MAX_INPUT_LENGTH) */
} else {
strcpy(t->last_input, tmp); /* strcpy: OK (by mutual MAX_INPUT_LENGTH) */
if (t->history[t->history_pos])
free(t->history[t->history_pos]); /* Clear the old line. */
t->history[t->history_pos] = strdup(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, '^'))) {
write_to_output(t, "Invalid substitution.\r\n");
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))) {
write_to_output(t, "Invalid substitution.\r\n");
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); /* strncpy: OK (newsub:MAX_INPUT_LENGTH+5 > orig:MAX_INPUT_LENGTH) */
newsub[strpos - orig] = '\0';
/* now, the replacement string */
strncat(newsub, second, MAX_INPUT_LENGTH - strlen(newsub) - 1); /* strncpy: OK */
/* 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); /* strncpy: OK */
/* terminate the string in case of an overflow from strncat */
newsub[MAX_INPUT_LENGTH - 1] = '\0';
strcpy(subst, newsub); /* strcpy: OK (by mutual MAX_INPUT_LENGTH) */
return (0);
}
void close_socket(struct descriptor_data *d)
{
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) {
write_to_output(d->snoop_by, "Your victim is no longer among us.\r\n");
d->snoop_by->snooping = NULL;
}
if (d->character) {
/* If we're switched, this resets the mobile taken. */
d->character->desc = NULL;
/* Plug memory leak, from Eric Green. */
if (!IS_NPC(d->character) && 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) {
struct char_data *link_challenged = d->original ? d->original : d->character;
/* We are guaranteed to have a person. */
act("$n has lost $s link.", TRUE, link_challenged, 0, 0, TO_ROOM);
save_char(link_challenged);
mudlog(NRM, MAX(LVL_IMMORT, GET_INVIS_LEV(link_challenged)), TRUE, "Closing link to: %s.", GET_NAME(link_challenged));
} else {
mudlog(CMP, LVL_IMMORT, TRUE, "Losing player: %s.", GET_NAME(d->character) ? GET_NAME(d->character) : "<null>");
free_char(d->character);
}
} else
mudlog(CMP, LVL_IMMORT, TRUE, "Losing descriptor without char.");
/* 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);
write_to_output(d, "\r\nTimed out... goodbye.\r\n");
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)
{
unsigned long val = 1;
ioctlsocket(s, FIONBIO, &val);
}
#elif defined(CIRCLE_AMIGA)
void nonblock(socket_t s)
{
long 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_VMS)
void nonblock(socket_t s)
{
int val = 1;
if (ioctl(s, FIONBIO, &val) < 0) {
perror("SYSERR: Fatal error executing nonblock (comm.c)");
exit(1);
}
}
#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)
{
reread_wizlist = TRUE;
}
RETSIGTYPE unrestrict_game(int sig)
{
emergency_unban = TRUE;
}
#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);
}
/* Dying anyway... */
RETSIGTYPE checkpointing(int sig)
{
if (!tics) {
log("SYSERR: CHECKPOINT shutdown: tics not updated. (Infinite loop suspected)");
abort();
} else
tics = 0;
}
/* Dying anyway... */
RETSIGTYPE hupsig(int sig)
{
log("SYSERR: Received SIGHUP, SIGINT, or SIGTERM. Shutting down...");
exit(1); /* perhaps something more elegant should
* substituted */
}
#endif /* CIRCLE_UNIX */
/*
* 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 sact, oact;
sact.sa_handler = func;
sigemptyset(&sact.sa_mask);
sact.sa_flags = 0;
#ifdef SA_INTERRUPT
sact.sa_flags |= SA_INTERRUPT; /* SunOS */
#endif
if (sigaction(signo, &sact, &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 || CIRCLE_MACINTOSH */
/* ****************************************************************
* Public routines for system-to-player-communication *
**************************************************************** */
size_t send_to_char(struct char_data *ch, const char *messg, ...)
{
if (ch->desc && messg && *messg) {
size_t left;
va_list args;
va_start(args, messg);
left = vwrite_to_output(ch->desc, messg, args);
va_end(args);
return left;
}
return 0;
}
void send_to_all(const char *messg, ...)
{
struct descriptor_data *i;
va_list args;
if (messg == NULL)
return;
for (i = descriptor_list; i; i = i->next) {
if (STATE(i) != CON_PLAYING)
continue;
va_start(args, messg);
vwrite_to_output(i, messg, args);
va_end(args);
}
}
void send_to_outdoor(const char *messg, ...)
{
struct descriptor_data *i;
if (!messg || !*messg)
return;
for (i = descriptor_list; i; i = i->next) {
va_list args;
if (STATE(i) != CON_PLAYING || i->character == NULL)
continue;
if (!AWAKE(i->character) || !OUTSIDE(i->character))
continue;
va_start(args, messg);
vwrite_to_output(i, messg, args);
va_end(args);
}
}
void send_to_room(room_rnum room, const char *messg, ...)
{
struct char_data *i;
va_list args;
if (messg == NULL)
return;
for (i = world[room].people; i; i = i->next_in_room) {
if (!i->desc)
continue;
va_start(args, messg);
vwrite_to_output(i->desc, messg, args);
va_end(args);
}
}
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, const struct char_data *to)
{
const char *i = NULL;
char lbuf[MAX_STRING_LENGTH], *buf, *j;
bool uppercasenext = FALSE;
buf = lbuf;
for (;;) {
if (*orig == '$') {
switch (*(++orig)) {
case 'n':
i = PERS(ch, to);
break;
case 'N':
CHECK_NULL(vict_obj, PERS((const struct char_data *) vict_obj, to));
break;
case 'm':
i = HMHR(ch);
break;
case 'M':
CHECK_NULL(vict_obj, HMHR((const struct char_data *) vict_obj));
break;
case 's':
i = HSHR(ch);
break;
case 'S':
CHECK_NULL(vict_obj, HSHR((const struct char_data *) vict_obj));
break;
case 'e':
i = HSSH(ch);
break;
case 'E':
CHECK_NULL(vict_obj, HSSH((const struct char_data *) vict_obj));
break;
case 'o':
CHECK_NULL(obj, OBJN(obj, to));
break;
case 'O':
CHECK_NULL(vict_obj, OBJN((const struct obj_data *) vict_obj, to));
break;
case 'p':
CHECK_NULL(obj, OBJS(obj, to));
break;
case 'P':
CHECK_NULL(vict_obj, OBJS((const struct obj_data *) vict_obj, to));
break;
case 'a':
CHECK_NULL(obj, SANA(obj));
break;
case 'A':
CHECK_NULL(vict_obj, SANA((const struct obj_data *) vict_obj));
break;
case 'T':
CHECK_NULL(vict_obj, (const char *) vict_obj);
break;
case 'F':
CHECK_NULL(vict_obj, fname((const char *) vict_obj));
break;
/* uppercase previous word */
case 'u':
for (j=buf; j > lbuf && !isspace((int) *(j-1)); j--);
if (j != buf)
*j = UPPER(*j);
i = "";
break;
/* uppercase next word */
case 'U':
uppercasenext = TRUE;
i = "";
break;
case '$':
i = "$";
break;
default:
log("SYSERR: Illegal $-code to act(): %c", *orig);
log("SYSERR: %s", orig);
i = "";
break;
}
while ((*buf = *(i++)))
{
if (uppercasenext && !isspace((int) *buf))
{
*buf = UPPER(*buf);
uppercasenext = FALSE;
}
buf++;
}
orig++;
} else if (!(*(buf++) = *(orig++))) {
break;
} else if (uppercasenext && !isspace((int) *(buf-1))) {
*(buf-1) = UPPER(*(buf-1));
uppercasenext = FALSE;
}
}
*(--buf) = '\r';
*(++buf) = '\n';
*(++buf) = '\0';
write_to_output(to->desc, "%s", CAP(lbuf));
}
#define SENDOK(ch) ((ch)->desc && (to_sleeping || AWAKE(ch)) && \
(IS_NPC(ch) || !PLR_FLAGGED((ch), PLR_WRITING)))
void act(const char *str, int hide_invisible, struct char_data *ch,
struct obj_data *obj, const void *vict_obj, int type)
{
const struct char_data *to;
int to_sleeping;
if (!str || !*str)
return;
/*
* 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 = (const struct char_data *) vict_obj) != NULL && 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 && IN_ROOM(ch) != NOWHERE)
to = world[IN_ROOM(ch)].people;
else if (obj && IN_ROOM(obj) != NOWHERE)
to = world[IN_ROOM(obj)].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);
}
}
/* Prefer the file over the descriptor. */
void setup_log(const char *filename, int fd)
{
FILE *s_fp;
#if defined(__MWERKS__) || defined(__GNUC__)
s_fp = stderr;
#else
if ((s_fp = fdopen(STDERR_FILENO, "w")) == NULL) {
puts("SYSERR: Error opening stderr, trying stdout.");
if ((s_fp = fdopen(STDOUT_FILENO, "w")) == NULL) {
puts("SYSERR: Error opening stdout, trying a file.");
/* If we don't have a file, try a default. */
if (filename == NULL || *filename == '\0')
filename = "log/syslog";
}
}
#endif
if (filename == NULL || *filename == '\0') {
/* No filename, set us up with the descriptor we just opened. */
logfile = s_fp;
puts("Using file descriptor for logging.");
return;
}
/* We honor the default filename first. */
if (open_logfile(filename, s_fp))
return;
/* Well, that failed but we want it logged to a file so try a default. */
if (open_logfile("log/syslog", s_fp))
return;
/* Ok, one last shot at a file. */
if (open_logfile("syslog", s_fp))
return;
/* Erp, that didn't work either, just die. */
puts("SYSERR: Couldn't open anything to log to, giving up.");
exit(1);
}
int open_logfile(const char *filename, FILE *stderr_fp)
{
if (stderr_fp) /* freopen() the descriptor. */
logfile = freopen(filename, "w", stderr_fp);
else
logfile = fopen(filename, "w");
if (logfile) {
printf("Using log file '%s'%s.\n",
filename, stderr_fp ? " with redirection" : "");
return (TRUE);
}
printf("SYSERR: Error opening file '%s': %s\n", filename, strerror(errno));
return (FALSE);
}
/*
* This may not be pretty but it keeps game_loop() neater than if it was inline.
*/
#if defined(CIRCLE_WINDOWS)
void circle_sleep(struct timeval *timeout)
{
Sleep(timeout->tv_sec * 1000 + timeout->tv_usec / 1000);
}
#else
void circle_sleep(struct timeval *timeout)
{
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 */