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/* |
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* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
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* |
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* Copyright (c) 2000 Kevin L. Mitchell <klmitch@mit.edu> |
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* Copyright (c) 2013-2020 ircd-hybrid development team |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 |
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* USA |
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*/ |
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|
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/*! \file motd.c |
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* \brief Message-of-the-day manipulation implementation. |
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* \version $Id$ |
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*/ |
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|
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#include "stdinc.h" |
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#include "list.h" |
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#include "ircd.h" |
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#include "conf.h" |
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#include "send.h" |
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#include "numeric.h" |
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#include "client.h" |
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#include "irc_string.h" |
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#include "memory.h" |
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#include "log.h" |
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#include "motd.h" |
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#include "hostmask.h" |
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#include "misc.h" |
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|
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|
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/** Global list of messages of the day. */ |
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static struct |
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{ |
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struct Motd *local; /**< Local MOTD. */ |
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struct Motd *remote; /**< Remote MOTD. */ |
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dlink_list other; /**< MOTDs specified in configuration file. */ |
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dlink_list cachelist; /**< List of MotdCache entries. */ |
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} MotdList; |
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|
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|
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/*! \brief Create a struct Motd and initialize it. |
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* \param mask Hostmask (or connection class name) to filter on. |
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* \param path Path to MOTD file. |
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*/ |
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static struct Motd * |
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motd_create(const char *mask, const char *path) |
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{ |
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struct Motd *motd = xcalloc(sizeof(*motd)); |
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|
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if (EmptyString(mask)) |
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motd->type = MOTD_UNIVERSAL; |
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else if (class_find(mask, true)) |
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motd->type = MOTD_CLASS; |
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else |
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{ |
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switch (parse_netmask(mask, &motd->address, &motd->addrbits)) |
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{ |
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case HM_IPV4: |
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motd->type = MOTD_IPMASKV4; |
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break; |
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case HM_IPV6: |
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motd->type = MOTD_IPMASKV6; |
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break; |
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default: /* HM_HOST */ |
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motd->type = MOTD_HOSTMASK; |
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break; |
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} |
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} |
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|
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if (mask) |
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motd->mask = xstrdup(mask); |
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|
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motd->path = xstrdup(path); |
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motd->maxcount = MOTD_MAXLINES; |
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|
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return motd; |
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} |
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|
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/*! brief\ This function reads a motd out of a file (if needed) and caches it. |
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* If a matching cache entry already exists, reuse it. Otherwise, |
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* allocate and populate a new MotdCache for it. |
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* \param motd Specification for MOTD file. |
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* \return Matching MotdCache entry. |
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*/ |
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static struct MotdCache * |
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motd_cache(struct Motd *motd) |
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{ |
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FILE *file = NULL; |
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struct stat sb; |
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char line[MOTD_LINESIZE + 2]; /* +2 for \r\n */ |
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char *tmp = NULL; |
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unsigned int i = 0; |
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dlink_node *node; |
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|
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assert(motd); |
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assert(motd->path); |
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|
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if (motd->cache) |
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return motd->cache; |
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|
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/* Try to find it in the list of cached files */ |
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DLINK_FOREACH(node, MotdList.cachelist.head) |
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{ |
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struct MotdCache *cache = node->data; |
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|
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if (strcmp(cache->path, motd->path) == 0 && cache->maxcount == motd->maxcount) |
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{ |
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cache->ref++; /* Increase reference count */ |
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motd->cache = cache; /* Remember cache */ |
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return motd->cache; /* Return it */ |
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} |
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} |
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|
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/* Need the file's modification time */ |
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if (stat(motd->path, &sb) == -1) |
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{ |
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ilog(LOG_TYPE_IRCD, "Couldn't stat \"%s\": %s", motd->path, |
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strerror(errno)); |
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return 0; |
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} |
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|
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/* Gotta read in the file, now */ |
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if ((file = fopen(motd->path, "r")) == NULL) |
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{ |
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ilog(LOG_TYPE_IRCD, "Couldn't open \"%s\": %s", motd->path, |
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strerror(errno)); |
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return 0; |
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} |
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|
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/* Ok, allocate a structure; we'll realloc later to trim memory */ |
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struct MotdCache *cache = xcalloc(sizeof(*cache) + (MOTD_LINESIZE * MOTD_MAXLINES)); |
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cache->ref = 1; |
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cache->path = xstrdup(motd->path); |
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cache->maxcount = motd->maxcount; |
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cache->modtime = sb.st_mtime; /* Store modtime */ |
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|
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while (cache->count < cache->maxcount && fgets(line, sizeof(line), file)) |
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{ |
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/* Copy over line, stopping when we overflow or hit line end */ |
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for (tmp = line, i = 0; i < (MOTD_LINESIZE - 1) && *tmp && *tmp != '\r' && *tmp != '\n'; ++tmp, ++i) |
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cache->motd[cache->count][i] = *tmp; |
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cache->motd[cache->count][i] = '\0'; |
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|
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cache->count++; |
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} |
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|
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fclose(file); /* Close the file */ |
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|
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/* Trim memory usage a little */ |
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motd->cache = xcalloc(sizeof(*motd->cache) + (MOTD_LINESIZE * cache->count)); |
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memcpy(motd->cache, cache, sizeof(*motd->cache) + (MOTD_LINESIZE * cache->count)); |
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xfree(cache); |
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|
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/* Now link it in */ |
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dlinkAdd(motd->cache, &motd->cache->node, &MotdList.cachelist); |
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|
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return motd->cache; |
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} |
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|
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/*! \brief Clear and dereference the Motd::cache element of \a motd. |
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* If the MotdCache::ref count goes to zero, free it. |
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* \param motd MOTD to uncache. |
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*/ |
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static void |
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motd_decache(struct Motd *motd) |
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{ |
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struct MotdCache *cache; |
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|
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assert(motd); |
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|
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if ((cache = motd->cache) == NULL) /* We can be called for records with no cache */ |
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return; |
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|
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motd->cache = NULL; /* Zero the cache */ |
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|
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if (--cache->ref == 0) /* Reduce reference count */ |
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{ |
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dlinkDelete(&cache->node, &MotdList.cachelist); |
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xfree(cache->path); /* Free path info */ |
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xfree(cache); /* Very simple for a reason */ |
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} |
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} |
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|
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/*! \brief Deallocate a MOTD structure. |
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* If it has cached content, uncache it. |
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* \param motd MOTD to destroy. |
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*/ |
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static void |
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motd_destroy(struct Motd *motd) |
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{ |
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assert(motd); |
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|
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if (motd->cache) /* Drop the cache */ |
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motd_decache(motd); |
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|
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xfree(motd->path); /* We always must have a path */ |
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xfree(motd->mask); |
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xfree(motd); |
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} |
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|
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/*! \brief Find the first matching MOTD block for a user. |
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* If the user is remote, always use remote MOTD. |
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* Otherwise, if there is a hostmask- or class-based MOTD that matches |
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* the user, use it. |
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* Otherwise, use the local MOTD. |
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* \param client Client to find MOTD for. |
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* \return Pointer to first matching MOTD for the client. |
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*/ |
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static struct Motd * |
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motd_lookup(const struct Client *client) |
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{ |
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dlink_node *node; |
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|
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assert(client); |
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|
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if (!MyConnect(client)) /* Not my user, always return remote motd */ |
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return MotdList.remote; |
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|
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/* Check the motd blocks first */ |
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DLINK_FOREACH(node, MotdList.other.head) |
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{ |
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struct Motd *motd = node->data; |
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|
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switch (motd->type) |
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{ |
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case MOTD_CLASS: |
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{ |
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const struct ClassItem *class = class_get_ptr(&client->connection->confs); |
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if (match(motd->mask, class->name) == 0) |
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return motd; |
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break; |
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} |
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case MOTD_HOSTMASK: |
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if (match(motd->mask, client->realhost) == 0 || |
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match(motd->mask, client->sockhost) == 0 || match(motd->mask, client->host) == 0) |
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return motd; |
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break; |
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case MOTD_IPMASKV4: |
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if (client->ip.ss.ss_family == AF_INET) |
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if (match_ipv4(&client->ip, &motd->address, motd->addrbits)) |
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return motd; |
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break; |
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case MOTD_IPMASKV6: |
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if (client->ip.ss.ss_family == AF_INET6) |
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if (match_ipv6(&client->ip, &motd->address, motd->addrbits)) |
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return motd; |
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break; |
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default: break; |
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} |
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} |
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|
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return MotdList.local; /* Ok, return the default motd */ |
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} |
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|
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/*! \brief Send the content of a MotdCache to a user. |
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* If \a cache is NULL, simply send ERR_NOMOTD to the client. |
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* \param client Client to send MOTD to. |
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* \param cache MOTD body to send to client. |
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*/ |
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static void |
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motd_forward(struct Client *client, const struct MotdCache *cache) |
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{ |
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if (cache == NULL) /* No motd to send */ |
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{ |
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sendto_one_numeric(client, &me, ERR_NOMOTD); |
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return; |
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} |
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|
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/* Send the motd */ |
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sendto_one_numeric(client, &me, RPL_MOTDSTART, me.name); |
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|
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for (unsigned int i = 0; i < cache->count; ++i) |
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sendto_one_numeric(client, &me, RPL_MOTD, cache->motd[i]); |
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|
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sendto_one_numeric(client, &me, RPL_ENDOFMOTD); |
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} |
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|
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/*! \brief Find the MOTD for a client and send it. |
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* \param client Client being greeted. |
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*/ |
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void |
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motd_send(struct Client *client) |
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{ |
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assert(client); |
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|
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motd_forward(client, motd_cache(motd_lookup(client))); |
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} |
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|
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/*! \brief Send the signon MOTD to a user. |
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* If general::short_motd is true and a matching MOTD exists for the |
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* user, direct the client to type /MOTD to read it. Otherwise, call |
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* motd_forward() for the user. |
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* \param client Client that has just connected. |
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*/ |
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void |
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motd_signon(struct Client *client) |
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{ |
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const struct MotdCache *cache = motd_cache(motd_lookup(client)); |
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|
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if (ConfigGeneral.short_motd == 0 || cache == NULL) |
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motd_forward(client, cache); |
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else |
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{ |
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sendto_one_notice(client, &me, ":*** Notice -- motd was last changed at %s", |
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date_iso8601(cache->modtime)); |
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sendto_one_notice(client, &me, ":*** Notice -- Please read the motd if you haven't read it"); |
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sendto_one_numeric(client, &me, RPL_MOTDSTART, me.name); |
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sendto_one_numeric(client, &me, RPL_MOTD, "*** This is the short motd ***"); |
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sendto_one_numeric(client, &me, RPL_ENDOFMOTD); |
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} |
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} |
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|
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/*! \brief Clear all cached MOTD bodies. |
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* The local and remote MOTDs are re-cached immediately. |
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*/ |
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void |
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motd_recache(void) |
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{ |
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dlink_node *node; |
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|
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motd_decache(MotdList.local); /* Decache local and remote MOTDs */ |
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motd_decache(MotdList.remote); |
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|
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DLINK_FOREACH(node, MotdList.other.head) /* Now all the others */ |
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motd_decache(node->data); |
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|
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/* Now recache local and remote MOTDs */ |
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motd_cache(MotdList.local); |
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motd_cache(MotdList.remote); |
| 342 |
} |
| 343 |
|
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/*! \brief Re-cache the local and remote MOTDs. |
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* If they already exist, they are deallocated first. |
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*/ |
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void |
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motd_init(void) |
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{ |
| 350 |
if (MotdList.local) /* Destroy old local MOTD */ |
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motd_destroy(MotdList.local); |
| 352 |
|
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MotdList.local = motd_create(NULL, MPATH); |
| 354 |
motd_cache(MotdList.local); /* Initialize local MOTD and cache it */ |
| 355 |
|
| 356 |
if (MotdList.remote) /* Destroy old remote MOTD */ |
| 357 |
motd_destroy(MotdList.remote); |
| 358 |
|
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MotdList.remote = motd_create(NULL, MPATH); |
| 360 |
motd_cache(MotdList.remote); /* Initialize remote MOTD and cache it */ |
| 361 |
} |
| 362 |
|
| 363 |
/* \brief Add a new MOTD. |
| 364 |
* \param mask Hostmask (or connection class name) to send this to. |
| 365 |
* \param path Pathname of file to send. |
| 366 |
*/ |
| 367 |
void |
| 368 |
motd_add(const char *mask, const char *path) |
| 369 |
{ |
| 370 |
struct Motd *motd = motd_create(mask, path); /* Create the motd */ |
| 371 |
|
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dlinkAdd(motd, &motd->node, &MotdList.other); |
| 373 |
} |
| 374 |
|
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/*! \brief Clear out all MOTDs. |
| 376 |
* Compared to motd_recache(), this destroys all hostmask- or |
| 377 |
* class-based MOTDs rather than simply uncaching them. |
| 378 |
* Re-cache the local and remote MOTDs. |
| 379 |
*/ |
| 380 |
void |
| 381 |
motd_clear(void) |
| 382 |
{ |
| 383 |
motd_decache(MotdList.local); /* Decache local and remote MOTDs */ |
| 384 |
motd_decache(MotdList.remote); |
| 385 |
|
| 386 |
while (MotdList.other.head) /* Destroy other MOTDs */ |
| 387 |
{ |
| 388 |
struct Motd *motd = MotdList.other.head->data; |
| 389 |
dlinkDelete(&motd->node, &MotdList.other); |
| 390 |
motd_destroy(motd); |
| 391 |
} |
| 392 |
|
| 393 |
/* Now recache local and remote MOTDs */ |
| 394 |
motd_cache(MotdList.local); |
| 395 |
motd_cache(MotdList.remote); |
| 396 |
} |
| 397 |
|
| 398 |
/*! \brief Report list of non-default MOTDs. |
| 399 |
* \param client Client requesting statistics. |
| 400 |
*/ |
| 401 |
void |
| 402 |
motd_report(struct Client *client, int parc, char *parv[]) |
| 403 |
{ |
| 404 |
dlink_node *node; |
| 405 |
|
| 406 |
DLINK_FOREACH(node, MotdList.other.head) |
| 407 |
{ |
| 408 |
const struct Motd *motd = node->data; |
| 409 |
|
| 410 |
sendto_one_numeric(client, &me, RPL_STATSTLINE, |
| 411 |
motd->mask, motd->path); |
| 412 |
} |
| 413 |
} |
| 414 |
|
| 415 |
/*! \brief Report MOTD memory usage to a client. |
| 416 |
* \param client Client requesting memory usage. |
| 417 |
*/ |
| 418 |
void |
| 419 |
motd_memory_count(struct Client *client) |
| 420 |
{ |
| 421 |
dlink_node *node; |
| 422 |
unsigned int mt = 0; /* Motd count */ |
| 423 |
unsigned int mtc = 0; /* Motd cache count */ |
| 424 |
size_t mtm = 0; /* Memory consumed by motd */ |
| 425 |
size_t mtcm = 0; /* Memory consumed by motd cache */ |
| 426 |
|
| 427 |
if (MotdList.local) |
| 428 |
{ |
| 429 |
++mt; |
| 430 |
mtm += sizeof(struct Motd); |
| 431 |
mtm += MotdList.local->path ? (strlen(MotdList.local->path) + 1) : 0; |
| 432 |
} |
| 433 |
|
| 434 |
if (MotdList.remote) |
| 435 |
{ |
| 436 |
++mt; |
| 437 |
mtm += sizeof(struct Motd); |
| 438 |
mtm += MotdList.remote->path ? (strlen(MotdList.remote->path) + 1) : 0; |
| 439 |
} |
| 440 |
|
| 441 |
DLINK_FOREACH(node, MotdList.other.head) |
| 442 |
{ |
| 443 |
const struct Motd *motd = node->data; |
| 444 |
|
| 445 |
++mt; |
| 446 |
mtm += sizeof(struct Motd); |
| 447 |
mtm += motd->path ? (strlen(motd->path) + 1) : 0; |
| 448 |
} |
| 449 |
|
| 450 |
DLINK_FOREACH(node, MotdList.cachelist.head) |
| 451 |
{ |
| 452 |
const struct MotdCache *cache = node->data; |
| 453 |
|
| 454 |
++mtc; |
| 455 |
mtcm += sizeof(struct MotdCache) + (MOTD_LINESIZE * (cache->count - 1)); |
| 456 |
} |
| 457 |
|
| 458 |
sendto_one_numeric(client, &me, RPL_STATSDEBUG | SND_EXPLICIT, |
| 459 |
"z :Motds %u(%zu) Cache %u(%zu)", |
| 460 |
mt, mtm, mtc, mtcm); |
| 461 |
} |
