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construct/ircd/cache.c
2016-01-06 01:16:08 -06:00

392 lines
9.3 KiB
C

/*
* ircd-ratbox: an advanced Internet Relay Chat Daemon(ircd).
* cache.c - code for caching files
*
* Copyright (C) 2003 Lee Hardy <lee@leeh.co.uk>
* Copyright (C) 2003-2005 ircd-ratbox development team
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1.Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2.Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3.The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $Id: cache.c 25119 2008-03-13 16:57:05Z androsyn $
*/
#include "stdinc.h"
#include "ircd_defs.h"
#include "common.h"
#include "s_conf.h"
#include "client.h"
#include "hash.h"
#include "cache.h"
#include "irc_dictionary.h"
#include "numeric.h"
#include "send.h"
struct cachefile *user_motd = NULL;
struct cachefile *oper_motd = NULL;
struct cacheline *emptyline = NULL;
rb_dlink_list links_cache_list;
char user_motd_changed[MAX_DATE_STRING];
struct Dictionary *help_dict_oper = NULL;
struct Dictionary *help_dict_user = NULL;
/* init_cache()
*
* inputs -
* outputs -
* side effects - inits the file/line cache blockheaps, loads motds
*/
void
init_cache(void)
{
/* allocate the emptyline */
emptyline = rb_malloc(sizeof(struct cacheline));
emptyline->data = rb_strdup(" ");
user_motd_changed[0] = '\0';
user_motd = cache_file(MPATH, "ircd.motd", 0);
oper_motd = cache_file(OPATH, "opers.motd", 0);
memset(&links_cache_list, 0, sizeof(links_cache_list));
help_dict_oper = irc_dictionary_create(strcasecmp);
help_dict_user = irc_dictionary_create(strcasecmp);
}
/*
* removes tabs from src, replaces with 8 spaces, and returns the length
* of the new string. if the new string would be greater than destlen,
* it is truncated to destlen - 1
*/
static size_t
untabify(char *dest, const char *src, size_t destlen)
{
size_t x = 0, i;
const char *s = src;
char *d = dest;
while(*s != '\0' && x < destlen - 1)
{
if(*s == '\t')
{
for(i = 0; i < 8 && x < destlen - 1; i++, x++, d++)
*d = ' ';
s++;
} else
{
*d++ = *s++;
x++;
}
}
*d = '\0';
return x;
}
/* cache_file()
*
* inputs - file to cache, files "shortname", flags to set
* outputs - pointer to file cached, else NULL
* side effects -
*/
struct cachefile *
cache_file(const char *filename, const char *shortname, int flags)
{
FILE *in;
struct cachefile *cacheptr;
struct cacheline *lineptr;
char line[BUFSIZE];
char *p;
if((in = fopen(filename, "r")) == NULL)
return NULL;
cacheptr = rb_malloc(sizeof(struct cachefile));
rb_strlcpy(cacheptr->name, shortname, sizeof(cacheptr->name));
cacheptr->flags = flags;
/* cache the file... */
while(fgets(line, sizeof(line), in) != NULL)
{
if((p = strpbrk(line, "\r\n")) != NULL)
*p = '\0';
if(!EmptyString(line))
{
char untabline[BUFSIZE];
lineptr = rb_malloc(sizeof(struct cacheline));
untabify(untabline, line, sizeof(untabline));
lineptr->data = rb_strdup(untabline);
rb_dlinkAddTail(lineptr, &lineptr->linenode, &cacheptr->contents);
}
else
rb_dlinkAddTailAlloc(emptyline, &cacheptr->contents);
}
if (0 == rb_dlink_list_length(&cacheptr->contents))
{
/* No contents. Don't cache it after all. */
rb_free(cacheptr);
cacheptr = NULL;
}
fclose(in);
return cacheptr;
}
void
cache_links(void *unused)
{
struct Client *target_p;
rb_dlink_node *ptr;
rb_dlink_node *next_ptr;
char *links_line;
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, links_cache_list.head)
{
rb_free(ptr->data);
rb_free_rb_dlink_node(ptr);
}
links_cache_list.head = links_cache_list.tail = NULL;
links_cache_list.length = 0;
RB_DLINK_FOREACH(ptr, global_serv_list.head)
{
target_p = ptr->data;
/* skip ourselves (done in /links) and hidden servers */
if(IsMe(target_p) ||
(IsHidden(target_p) && !ConfigServerHide.disable_hidden))
continue;
/* if the below is ever modified, change LINKSLINELEN */
links_line = rb_malloc(LINKSLINELEN);
rb_snprintf(links_line, LINKSLINELEN, "%s %s :1 %s",
target_p->name, me.name,
target_p->info[0] ? target_p->info :
"(Unknown Location)");
rb_dlinkAddTailAlloc(links_line, &links_cache_list);
}
}
/* free_cachefile()
*
* inputs - cachefile to free
* outputs -
* side effects - cachefile and its data is free'd
*/
void
free_cachefile(struct cachefile *cacheptr)
{
rb_dlink_node *ptr;
rb_dlink_node *next_ptr;
if(cacheptr == NULL)
return;
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, cacheptr->contents.head)
{
if(ptr->data != emptyline)
{
struct cacheline *line = ptr->data;
rb_free(line->data);
rb_free(line);
}
}
rb_free(cacheptr);
}
/* load_help()
*
* inputs -
* outputs -
* side effects - old help cache deleted
* - contents of help directories are loaded.
*/
void
load_help(void)
{
DIR *helpfile_dir = NULL;
struct dirent *ldirent= NULL;
char filename[PATH_MAX];
struct cachefile *cacheptr;
struct DictionaryIter iter;
#if defined(S_ISLNK) && defined(HAVE_LSTAT)
struct stat sb;
#endif
DICTIONARY_FOREACH(cacheptr, &iter, help_dict_oper)
{
irc_dictionary_delete(help_dict_oper, cacheptr->name);
free_cachefile(cacheptr);
}
DICTIONARY_FOREACH(cacheptr, &iter, help_dict_user)
{
irc_dictionary_delete(help_dict_user, cacheptr->name);
free_cachefile(cacheptr);
}
helpfile_dir = opendir(HPATH);
if(helpfile_dir == NULL)
return;
while((ldirent = readdir(helpfile_dir)) != NULL)
{
if(ldirent->d_name[0] == '.')
continue;
rb_snprintf(filename, sizeof(filename), "%s/%s", HPATH, ldirent->d_name);
cacheptr = cache_file(filename, ldirent->d_name, HELP_OPER);
irc_dictionary_add(help_dict_oper, cacheptr->name, cacheptr);
}
closedir(helpfile_dir);
helpfile_dir = opendir(UHPATH);
if(helpfile_dir == NULL)
return;
while((ldirent = readdir(helpfile_dir)) != NULL)
{
if(ldirent->d_name[0] == '.')
continue;
rb_snprintf(filename, sizeof(filename), "%s/%s", UHPATH, ldirent->d_name);
#if defined(S_ISLNK) && defined(HAVE_LSTAT)
if(lstat(filename, &sb) < 0)
continue;
/* ok, if its a symlink, we work on the presumption if an
* oper help exists of that name, its a symlink to that --fl
*/
if(S_ISLNK(sb.st_mode))
{
cacheptr = irc_dictionary_retrieve(help_dict_oper, ldirent->d_name);
if(cacheptr != NULL)
{
cacheptr->flags |= HELP_USER;
continue;
}
}
#endif
cacheptr = cache_file(filename, ldirent->d_name, HELP_USER);
irc_dictionary_add(help_dict_user, cacheptr->name, cacheptr);
}
closedir(helpfile_dir);
}
/* send_user_motd()
*
* inputs - client to send motd to
* outputs - client is sent motd if exists, else ERR_NOMOTD
* side effects -
*/
void
send_user_motd(struct Client *source_p)
{
struct cacheline *lineptr;
rb_dlink_node *ptr;
const char *myname = get_id(&me, source_p);
const char *nick = get_id(source_p, source_p);
if(user_motd == NULL || rb_dlink_list_length(&user_motd->contents) == 0)
{
sendto_one(source_p, form_str(ERR_NOMOTD), myname, nick);
return;
}
sendto_one(source_p, form_str(RPL_MOTDSTART), myname, nick, me.name);
RB_DLINK_FOREACH(ptr, user_motd->contents.head)
{
lineptr = ptr->data;
sendto_one(source_p, form_str(RPL_MOTD), myname, nick, lineptr->data);
}
sendto_one(source_p, form_str(RPL_ENDOFMOTD), myname, nick);
}
void
cache_user_motd(void)
{
struct stat sb;
struct tm *local_tm;
if(stat(MPATH, &sb) == 0)
{
local_tm = localtime(&sb.st_mtime);
if(local_tm != NULL)
{
rb_snprintf(user_motd_changed, sizeof(user_motd_changed),
"%d/%d/%d %d:%d",
local_tm->tm_mday, local_tm->tm_mon + 1,
1900 + local_tm->tm_year, local_tm->tm_hour,
local_tm->tm_min);
}
}
free_cachefile(user_motd);
user_motd = cache_file(MPATH, "ircd.motd", 0);
}
/* send_oper_motd()
*
* inputs - client to send motd to
* outputs - client is sent oper motd if exists
* side effects -
*/
void
send_oper_motd(struct Client *source_p)
{
struct cacheline *lineptr;
rb_dlink_node *ptr;
if(oper_motd == NULL || rb_dlink_list_length(&oper_motd->contents) == 0)
return;
sendto_one(source_p, form_str(RPL_OMOTDSTART),
me.name, source_p->name);
RB_DLINK_FOREACH(ptr, oper_motd->contents.head)
{
lineptr = ptr->data;
sendto_one(source_p, form_str(RPL_OMOTD),
me.name, source_p->name, lineptr->data);
}
sendto_one(source_p, form_str(RPL_ENDOFOMOTD),
me.name, source_p->name);
}