/* ************************************************************************ * 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 <stdio.h> #include <stdlib.h> #include <ctype.h> #include <limits.h> #include <errno.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/wait.h> #include <sys/time.h> #include <sys/resource.h> #include <netdb.h> #include <string.h> #include <fcntl.h> #include <signal.h> #include <netinet/in.h> #include "structs.h" #include "utils.h" #include "comm.h" #include "interpreter.h" #include "handler.h" #include "db.h" #include "house.h" #include "screen.h" /* externs */ extern int restrict; extern int mini_mud; extern int no_rent_check; extern FILE *player_fl; extern int DFLT_PORT; extern char *DFLT_DIR; extern int MAX_PLAYERS; extern int MAX_DESCRIPTORS_AVAILABLE; 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[]; /* 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 avail_descs = 0; /* max descriptors available */ int tics = 0; /* for extern checkpointing */ int scheck = 0; /* for syntax checking mode */ bool MOBTrigger = TRUE; /* For MOBProgs */ 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 */ /* functions in this file */ 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_avail_descs(void); int process_output(struct descriptor_data * t); int process_input(struct descriptor_data * t); void close_socket(struct descriptor_data * d); struct timeval timediff(struct timeval * a, struct timeval * b); void flush_queues(struct descriptor_data * d); void nonblock(int 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); void make_prompt(struct descriptor_data * point); /* extern fcnts */ void boot_db(void); void boot_world(void); void zone_update(void); void affect_update(void); /* In spells.c */ void point_update(void); /* In limits.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); extern void mprog_act_trigger(char *buf, struct char_data *mob, struct char_data *ch, struct obj_data *obj, void *vo); /* ********************************************************************* * main game loop and related stuff * ********************************************************************* */ int main(int argc, char **argv) { int port; char buf[512]; int pos = 1; char *dir; port = DFLT_PORT; dir = DFLT_DIR; 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("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': restrict = 1; log("Restricting game -- no new players allowed."); break; case 's': no_specials = 1; log("Suppressing assignment of special routines."); break; default: sprintf(buf, "SYSERR: Unknown option -%c in argument string.", *(argv[pos] + 1)); log(buf); break; } pos++; } if (pos < argc) { if (!isdigit(*argv[pos])) { fprintf(stderr, "Usage: %s [-c] [-m] [-q] [-r] [-s] [-d pathname] [port #]\n", argv[0]); exit(1); } else if ((port = atoi(argv[pos])) <= 1024) { fprintf(stderr, "Illegal port number.\n"); exit(1); } } if (chdir(dir) < 0) { perror("Fatal error changing to data directory"); exit(1); } sprintf(buf, "Using %s as data directory.", dir); log(buf); if (scheck) { boot_world(); log("Done."); exit(0); } else { sprintf(buf, "Running game on port %d.", port); log(buf); init_game(port); } return 0; } /* Init sockets, run game, and cleanup sockets */ void init_game(int port) { int mother_desc; void my_srand(unsigned long initial_seed); my_srand(time(0)); log("Opening mother connection."); mother_desc = init_socket(port); avail_descs = get_avail_descs(); boot_db(); log("Signal trapping."); signal_setup(); log("Entering game loop."); game_loop(mother_desc); log("Closing all sockets."); while (descriptor_list) close_socket(descriptor_list); close(mother_desc); fclose(player_fl); 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; /* * 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 ths point is (hopefully) moot. */ if ((s = socket(PF_INET, SOCK_STREAM, 0)) < 0) { perror("Create socket"); exit(1); } #if defined(SO_SNDBUF) opt = LARGE_BUFSIZE + GARBAGE_SPACE; if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *) &opt, sizeof(opt)) < 0) { perror("setsockopt SNDBUF"); exit(1); } #endif #if defined(SO_REUSEADDR) opt = 1; if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &opt, sizeof(opt)) < 0) { perror("setsockopt REUSEADDR"); exit(1); } #endif #if defined(SO_REUSEPORT) opt = 1; if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (char *) &opt, sizeof(opt)) < 0) { perror("setsockopt REUSEPORT"); exit(1); } #endif #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("setsockopt LINGER"); exit(1); } } #endif sa.sin_family = AF_INET; sa.sin_port = htons(port); sa.sin_addr.s_addr = htonl(INADDR_ANY); if (bind(s, (struct sockaddr *) & sa, sizeof(sa)) < 0) { perror("bind"); close(s); exit(1); } nonblock(s); listen(s, 5); return s; } int get_avail_descs(void) { int max_descs = 0; /* * First, we'll try using getrlimit/setrlimit. This will probably work * on most systems. */ #if defined (RLIMIT_NOFILE) || defined (RLIMIT_OFILE) #if !defined(RLIMIT_NOFILE) #define RLIMIT_NOFILE RLIMIT_OFILE #endif { struct rlimit limit; getrlimit(RLIMIT_NOFILE, &limit); max_descs = MIN(MAX_PLAYERS + NUM_RESERVED_DESCS, limit.rlim_max); limit.rlim_cur = max_descs; setrlimit(RLIMIT_NOFILE, &limit); } #elif defined (OPEN_MAX) || defined(FOPEN_MAX) #if !defined(OPEN_MAX) #define OPEN_MAX FOPEN_MAX #endif max_descs = OPEN_MAX; /* Uh oh.. rlimit didn't work, but we have * OPEN_MAX */ #else /* * Okay, you don't have getrlimit() and you don't have OPEN_MAX. Time to * use the POSIX sysconf() function. (See Stevens' _Advanced Programming * in the UNIX Environment_). */ errno = 0; if ((max_descs = sysconf(_SC_OPEN_MAX)) < 0) { if (errno == 0) max_descs = MAX_PLAYERS + NUM_RESERVED_DESCS; else { perror("Error calling sysconf"); exit(1); } } #endif max_descs = MIN(MAX_PLAYERS, max_descs - NUM_RESERVED_DESCS); if (max_descs <= 0) { log("Non-positive max player limit!"); exit(1); } sprintf(buf, "Setting player limit to %d.", max_descs); log(buf); return max_descs; } /* * 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; struct timeval last_time, now, timespent, timeout, opt_time; char comm[MAX_INPUT_LENGTH]; struct descriptor_data *d, *next_d; int pulse = 0, mins_since_crashsave = 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; 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) { if (d->descriptor > maxdesc) maxdesc = d->descriptor; FD_SET(d->descriptor, &input_set); FD_SET(d->descriptor, &output_set); FD_SET(d->descriptor, &exc_set); } /* * At this point, the original Diku code set up a signal mask to avoid * block all signals from being delivered. I believe this was done in * order to prevent the MUD from dying with an "interrupted system call" * error in the event that a signal be received while the MUD is dormant. * However, I think it is easier to check for an EINTR error return from * this select() call rather than to block and unblock signals. */ do { errno = 0; /* clear error condition */ /* figure out for how long we have to sleep */ gettimeofday(&now, (struct timezone *) 0); timespent = timediff(&now, &last_time); timeout = timediff(&opt_time, ×pent); /* sleep until the next 0.1 second mark */ if (select(0, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &timeout) < 0) if (errno != EINTR) { perror("Select sleep"); exit(1); } } while (errno); /* record the time for the next pass */ gettimeofday(&last_time, (struct timezone *) 0); /* 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; } /* New connection waiting for us? */ if (FD_ISSET(mother_desc, &input_set)) new_descriptor(mother_desc); /* kick out the freaky folks in the exception set */ 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; if ((--(d->wait) <= 0) && get_from_q(&d->input, comm, &aliased)) { if (d->character) { d->character->char_specials.timer = 0; if (!d->connected && 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->prompt_mode = 1; if (d->str) /* writing boards, mail, etc. */ string_add(d, comm); else if (d->showstr_point) /* reading something w/ pager */ show_string(d, comm); else if (d->connected != CON_PLAYING) /* in menus, etc. */ nanny(d, comm); else { /* else: we're playing normally */ if (aliased) /* to prevent recursive aliases */ d->prompt_mode = 0; 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 (FD_ISSET(d->descriptor, &output_set) && *(d->output)) if (process_output(d) < 0) close_socket(d); else d->prompt_mode = 1; } /* kick out folks in the CON_CLOSE state */ for (d = descriptor_list; d; d = next_d) { next_d = d->next; if (STATE(d) == CON_CLOSE) close_socket(d); } /* give each descriptor an appropriate prompt */ for (d = descriptor_list; d; d = d->next) { if (d->prompt_mode) { make_prompt(d); d->prompt_mode = 0; } } /* handle heartbeat stuff */ /* Note: pulse now changes every 0.10 seconds */ pulse++; if (!(pulse % PULSE_ZONE)) zone_update(); if (!(pulse % PULSE_MOBILE)) mobile_activity(); if (!(pulse % PULSE_VIOLENCE)) perform_violence(); if (!(pulse % (SECS_PER_MUD_HOUR * PASSES_PER_SEC / 3))) point_update(); if (!(pulse % (SECS_PER_MUD_HOUR * PASSES_PER_SEC))) { weather_and_time(1); affect_update(); fflush(player_fl); } if (auto_save) if (!(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 % (300 * PASSES_PER_SEC))) /* 5 minutes */ record_usage(); if (pulse >= (30 * 60 * PASSES_PER_SEC)) { /* 30 minutes */ pulse = 0; } tics++; /* tics since last checkpoint signal */ } } /* ****************************************************************** * 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). */ struct timeval timediff(struct timeval * a, struct timeval * b) { 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; } } void record_usage(void) { int sockets_connected = 0, sockets_playing = 0; struct descriptor_data *d; char buf[256]; for (d = descriptor_list; d; d = d->next) { sockets_connected++; if (!d->connected) sockets_playing++; } sprintf(buf, "nusage: %-3d sockets connected, %-3d sockets playing", sockets_connected, sockets_playing); log(buf); #ifdef RUSAGE { struct rusage ru; getrusage(0, &ru); sprintf(buf, "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); log(buf); } #endif } void make_prompt(struct descriptor_data * d) { extern struct title_type titles[NUM_CLASSES][LVL_IMPL + 1]; int i; char colorbuf[30]; if (d->str) write_to_descriptor(d->descriptor, "] "); else if (d->showstr_point) write_to_descriptor(d->descriptor, "*** Press return to continue, q to quit ***"); else if (!d->connected) { char prompt[MAX_INPUT_LENGTH]; *prompt = '\0'; if (GET_INVIS_LEV(d->character)) sprintf(prompt, "i%d ", GET_INVIS_LEV(d->character)); i = 100 * GET_HIT(d->character) / GET_MAX_HIT(d->character); STATUS_COLOR(i, colorbuf, d->character, C_SPR); if (PRF_FLAGGED(d->character, PRF_DISPHP)) sprintf(prompt, "%s%s%d%s/%dh ", prompt, colorbuf, GET_HIT(d->character), CCNRM(d->character, C_SPR), GET_MAX_HIT(d->character)); i = 100 * GET_MANA(d->character) / GET_MAX_MANA(d->character); STATUS_COLOR(i, colorbuf, d->character, C_SPR); if (PRF_FLAGGED(d->character, PRF_DISPMANA)) sprintf(prompt, "%s%s%d%sm ", prompt, colorbuf, GET_MANA(d->character), CCNRM(d->character, C_SPR)); i = 100 * GET_MOVE(d->character) / GET_MAX_MOVE(d->character); STATUS_COLOR(i, colorbuf, d->character, C_SPR); if (PRF_FLAGGED(d->character, PRF_DISPMOVE)) sprintf(prompt, "%s%s%d%sv ", prompt, colorbuf, GET_MOVE(d->character), CCNRM(d->character, C_SPR)); if (PRF_FLAGGED(d->character, PRF_DISPGOLD)) sprintf(prompt, "%s%s$%d%s ", prompt, CCYEL(d->character, C_SPR), GET_GOLD(d->character), CCNRM(d->character, C_SPR)); if (PRF_FLAGGED(d->character, PRF_DISPXP)) if (!IS_IMMORT(d->character)) sprintf(prompt, "%sXPtoLv %d: %d ", prompt, GET_LEVEL(d->character) + 1, (titles[(int) GET_CLASS_NUM_FULL(d->character)][GET_LEVEL(d->character) + 1].exp) - GET_EXP(d->character) ); if (PRF_FLAGGED(d->character, PRF_DISPDAM)) if (!FIGHTING(d->character)) sprintf(prompt, "%s[none] ", prompt); else { i = 100 * GET_HIT(FIGHTING(d->character)) / GET_MAX_HIT(FIGHTING(d->character)); STATUS_COLOR(i, colorbuf, d->character, C_SPR); sprintf(prompt, "%s%s%d0%s%% ", prompt, colorbuf, i / 10, CCNRM(d->character, C_SPR)); } strcat(prompt, "> "); write_to_descriptor(d->descriptor, prompt); } } void write_to_q(char *txt, struct txt_q * queue, int aliased) { struct txt_block *new; CREATE(new, struct txt_block, 1); CREATE(new->text, char, strlen(txt) + 1); strcpy(new->text, txt); new->aliased = aliased; /* queue empty? */ if (!queue->head) { new->next = NULL; queue->head = queue->tail = new; } else { queue->tail->next = new; queue->tail = new; new->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)); } 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; } else { /* otherwise, try switching to a lrg buffer */ if (t->large_outbuf || ((size + strlen(t->output)) > LARGE_BUFSIZE)) { /* * we're already using large buffer, or even the large buffer isn't big * enough -- switch to overflow state */ 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 */ /* calculate how much space is left in the buffer */ t->bufspace = LARGE_BUFSIZE - 1 - strlen(t->output); /* set the pointer for the next write */ t->bufptr = strlen(t->output); } } /* ****************************************************************** * socket handling * ****************************************************************** */ int new_descriptor(int s) { int desc, sockets_connected = 0; unsigned long addr; int i; static int last_desc = 0; /* last descriptor number */ struct descriptor_data *newd; struct sockaddr_in peer; struct hostent *from; extern char *GREETINGS; /* accept the new connection */ i = sizeof(peer); if ((desc = accept(s, (struct sockaddr *) & peer, &i)) < 0) { perror("accept"); return -1; } /* keep it from blocking */ nonblock(desc); /* make sure we have room for it */ for (newd = descriptor_list; newd; newd = newd->next) sockets_connected++; if (sockets_connected >= avail_descs) { write_to_descriptor(desc, "Sorry, CircleMUD is full right now... try again later! :-)\r\n"); close(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))) { if (!nameserver_is_slow) perror("gethostbyaddr"); addr = ntohl(peer.sin_addr.s_addr); sprintf(newd->host, "%d.%d.%d.%d", (int)((addr & 0xFF000000) >> 24), (int)((addr & 0x00FF0000) >> 16), (int)((addr & 0x0000FF00) >> 8), (int)((addr & 0x000000FF))); } 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(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->wait = 1; newd->output = newd->small_outbuf; newd->bufspace = SMALL_BUFSIZE - 1; newd->next = descriptor_list; newd->login_time = time(0); if (++last_desc == 1000) last_desc = 1; newd->desc_num = last_desc; /* prepend to list */ descriptor_list = newd; SEND_TO_Q(GREETINGS, newd); return 0; } int process_output(struct descriptor_data * t) { static char i[LARGE_BUFSIZE + GARBAGE_SPACE]; static 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**"); /* add the extra CRLF if the person isn't in compact mode */ if (!t->connected && t->character && !PRF_FLAGGED(t->character, PRF_COMPACT)) strcat(i + 2, "\r\n"); /* * now, send the output. If this is an 'interruption', use the prepended * CRLF, otherwise send the straight output sans CRLF. */ if (!t->prompt_mode) /* && !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; } int write_to_descriptor(int desc, char *txt) { int total, bytes_written; total = strlen(txt); do { if ((bytes_written = write(desc, txt, total)) < 0) { #ifdef EWOULDBLOCK if (errno == EWOULDBLOCK) errno = EAGAIN; #endif if (errno == EAGAIN) log("process_output: socket write would block, about to close"); else perror("Write to socket"); return -1; } else { txt += bytes_written; total -= bytes_written; } } while (total > 0); return 0; } /* * 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, bytes_read, space_left, failed_subst; 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; } if ((bytes_read = read(t->descriptor, read_point, space_left)) < 0) { #ifdef EWOULDBLOCK if (errno == EWOULDBLOCK) errno = EAGAIN; #endif if (errno != EAGAIN) { perror("process_input: about to lose connection"); return -1; /* some error condition was encountered on * read */ } else return 0; /* the read would have blocked: just means no * data there */ } else if (bytes_read == 0) { log("EOF on socket read (connection broken by peer)"); return -1; } /* 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 /* * 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') { /* handle backspacing */ 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 == '!') strcpy(tmp, t->last_input); 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 (!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 new[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(new, orig, (strpos - orig)); new[(strpos - orig)] = '\0'; /* now, the replacement string */ strncat(new, second, (MAX_INPUT_LENGTH - strlen(new) - 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(new, strpos + strlen(first), (MAX_INPUT_LENGTH - strlen(new) - 1)); /* terminate the string in case of an overflow from strncat */ new[MAX_INPUT_LENGTH-1] = '\0'; strcpy(subst, new); return 0; } void close_socket(struct descriptor_data * d) { struct descriptor_data *temp, *next_d; char buf[128]; long target_idnum = -1; close(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; } if (d->character) { target_idnum = GET_IDNUM(d->character); /* added to free up temporary editing constructs */ if (d->connected == CON_PLAYING || d->connected == CON_IEDIT || d->connected == CON_REDIT) { 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); if (d->edit_obj) free_obj(d->edit_obj); d->edit_obj = NULL; if (d->edit_room) free_room(d->edit_room); d->edit_room = NULL; 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 enending quest to make switch stable */ if (d->original && d->original->desc) d->original->desc = NULL; REMOVE_FROM_LIST(d, descriptor_list, next); if (d->showstr_head) free(d->showstr_head); free(d); /* * kill off all sockets connected to the same player as the one who is * trying to quit. Helps to maintain sanity as well as prevent duping. */ if (target_idnum >= 0) { for (temp = descriptor_list; temp; temp = next_d) { next_d = temp->next; if (temp->character && GET_IDNUM(temp->character) == target_idnum) close_socket(temp); } } } /* * 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.) */ #ifndef O_NONBLOCK #define O_NONBLOCK O_NDELAY #endif void nonblock(int s) { int flags; flags = fcntl(s, F_GETFL, 0); flags |= O_NONBLOCK; if (fcntl(s, F_SETFL, flags) < 0) { perror("Fatal error executing nonblock (comm.c)"); exit(1); } } /* ****************************************************************** * signal-handling functions (formerly signals.c) * ****************************************************************** */ void checkpointing() { if (!tics) { log("SYSERR: CHECKPOINT shutdown: tics not updated"); abort(); } else tics = 0; } void reread_wizlists() { void reboot_wizlists(void); mudlog("Signal received - rereading wizlists.", CMP, LVL_IMMORT, TRUE); reboot_wizlists(); } void unrestrict_game() { extern struct ban_list_element *ban_list; extern int num_invalid; mudlog("Received SIGUSR2 - completely unrestricting game (emergent)", BRF, LVL_IMMORT, TRUE); ban_list = NULL; restrict = 0; num_invalid = 0; } void hupsig() { log("Received SIGHUP, SIGINT, or SIGTERM. Shutting down..."); exit(0); /* 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. */ #if defined(NeXT) || defined(sun386) #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 /* NeXT */ void signal_setup(void) { 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(SIGINT, hupsig); my_signal(SIGTERM, hupsig); my_signal(SIGPIPE, SIG_IGN); my_signal(SIGALRM, SIG_IGN); } /* **************************************************************** * Public routines for system-to-player-communication * *******************************************************************/ void send_to_char(char *messg, struct char_data * ch) { if (ch->desc && messg) SEND_TO_Q(messg, ch->desc); } void send_to_all(char *messg) { struct descriptor_data *i; if (messg) for (i = descriptor_list; i; i = i->next) if (!i->connected) SEND_TO_Q(messg, i); } void send_to_outdoor(char *messg) { struct descriptor_data *i; if (!messg || !*messg) return; for (i = descriptor_list; i; i = i->next) if (!i->connected && i->character && AWAKE(i->character) && OUTSIDE(i->character)) SEND_TO_Q(messg, i); } void send_to_room(char *messg, int room) { struct char_data *i; if (messg) for (i = world[room].people; i; i = i->next_in_room) if (i->desc) SEND_TO_Q(messg, i->desc); } 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(char *orig, struct char_data * ch, struct obj_data * obj, void *vict_obj, struct char_data * to) { register char *i, *buf; static char lbuf[MAX_STRING_LENGTH]; 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)); break; case 'm': i = HMHR(ch); break; case 'M': CHECK_NULL(vict_obj, HMHR((struct char_data *) vict_obj)); break; case 's': i = HSHR(ch); break; case 'S': CHECK_NULL(vict_obj, HSHR((struct char_data *) vict_obj)); break; case 'e': i = HSSH(ch); break; case 'E': CHECK_NULL(vict_obj, HSSH((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)); break; case 'p': CHECK_NULL(obj, OBJS(obj, to)); break; case 'P': CHECK_NULL(vict_obj, OBJS((struct obj_data *) vict_obj, to)); break; case 'a': CHECK_NULL(obj, SANA(obj)); break; case 'A': CHECK_NULL(vict_obj, SANA((struct obj_data *) vict_obj)); break; case 'T': CHECK_NULL(vict_obj, (char *) vict_obj); break; case 'F': CHECK_NULL(vict_obj, fname((char *) vict_obj)); break; case '$': i = "$"; break; default: log("SYSERR: Illegal $-code to act():"); strcpy(buf1, "SYSERR: "); strcat(buf1, orig); log(buf1); 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 (MOBTrigger) mprog_act_trigger(lbuf, to, ch, obj, vict_obj); } #define SENDOK(ch) ((ch)->desc && (AWAKE(ch) || sleep) && \ !PLR_FLAGGED((ch), PLR_WRITING) && \ !PLR_FLAGGED((ch), PLR_EDITING)) void act(char *str, int hide_invisible, struct char_data * ch, struct obj_data * obj, void *vict_obj, int type) { struct char_data *to; static int sleep; if (!str || !*str) { MOBTrigger = TRUE; 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. */ /* check if TO_SLEEP is there, and remove it if it is. */ if ((sleep = (type & TO_SLEEP))) type &= ~TO_SLEEP; if (type == TO_CHAR) { if (ch && SENDOK(ch)) perform_act(str, ch, obj, vict_obj, ch); MOBTrigger = TRUE; return; } if (type == TO_VICT) { if ((to = (struct char_data *) vict_obj) && SENDOK(to)) perform_act(str, ch, obj, vict_obj, to); MOBTrigger = TRUE; 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) && !(hide_invisible && ch && !CAN_SEE(to, ch)) && (to != ch) && (type == TO_ROOM || (to != vict_obj))) perform_act(str, ch, obj, vict_obj, to); MOBTrigger = TRUE; }