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/*
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
*
* Copyright (c) 1997-2014 ircd-hybrid development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*! \file fdlist.c
* \brief Maintains a list of file descriptors.
* \version $Id$
*/
#include "stdinc.h"
#include "fdlist.h"
#include "client.h" /* struct Client */
#include "event.h"
#include "ircd.h" /* GlobalSetOptions */
#include "irc_string.h"
#include "s_bsd.h" /* comm_setselect */
#include "conf.h" /* ServerInfo */
#include "send.h"
#include "memory.h"
#include "numeric.h"
#include "s_misc.h"
#include "irc_res.h"
fde_t *fd_hash[FD_HASH_SIZE];
fde_t *fd_next_in_loop = NULL;
int number_fd = LEAKED_FDS;
int hard_fdlimit = 0;
static int
set_fdlimit(void)
{
int fdmax;
struct rlimit limit;
if (!getrlimit(RLIMIT_NOFILE, &limit))
{
limit.rlim_cur = limit.rlim_max;
setrlimit(RLIMIT_NOFILE, &limit);
}
fdmax = getdtablesize();
/* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
* some not really LEAKED_FDS */
fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);
/* under no condition shall this raise over 65536
* for example user ip heap is sized 2*hard_fdlimit */
hard_fdlimit = IRCD_MIN(fdmax, 65536);
return -1;
}
void
fdlist_init(void)
{
set_fdlimit();
}
static inline unsigned int
hash_fd(int fd)
{
return ((unsigned int)fd) % FD_HASH_SIZE;
}
fde_t *
lookup_fd(int fd)
{
fde_t *F = fd_hash[hash_fd(fd)];
while (F)
{
if (F->fd == fd)
return F;
F = F->hnext;
}
return NULL;
}
/* Called to open a given filedescriptor */
void
fd_open(fde_t *F, int fd, int is_socket, const char *desc)
{
unsigned int hashv = hash_fd(fd);
assert(fd >= 0);
F->fd = fd;
F->comm_index = -1;
if (desc)
strlcpy(F->desc, desc, sizeof(F->desc));
/* Note: normally we'd have to clear the other flags,
* but currently F is always cleared before calling us.. */
F->flags.open = 1;
F->flags.is_socket = is_socket;
F->hnext = fd_hash[hashv];
fd_hash[hashv] = F;
number_fd++;
}
/* Called to close a given filedescriptor */
void
fd_close(fde_t *F)
{
unsigned int hashv = hash_fd(F->fd);
if (F == fd_next_in_loop)
fd_next_in_loop = F->hnext;
if (F->flags.is_socket)
comm_setselect(F, COMM_SELECT_WRITE | COMM_SELECT_READ, NULL, NULL, 0);
delete_resolver_queries(F);
#ifdef HAVE_LIBCRYPTO
if (F->ssl)
SSL_free(F->ssl);
#endif
if (fd_hash[hashv] == F)
fd_hash[hashv] = F->hnext;
else {
fde_t *prev;
/* let it core if not found */
for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
;
prev->hnext = F->hnext;
}
/* Unlike squid, we're actually closing the FD here! -- adrian */
close(F->fd);
number_fd--;
memset(F, 0, sizeof(fde_t));
}
/*
* fd_dump() - dump the list of active filedescriptors
*/
void
fd_dump(struct Client *source_p)
{
int i;
fde_t *F;
for (i = 0; i < FD_HASH_SIZE; i++)
for (F = fd_hash[i]; F != NULL; F = F->hnext)
sendto_one(source_p, ":%s %d %s :fd %-5d desc '%s'",
me.name, RPL_STATSDEBUG, source_p->name,
F->fd, F->desc);
}
/*
* fd_note() - set the fd note
*
* Note: must be careful not to overflow fd_table[fd].desc when
* calling.
*/
void
fd_note(fde_t *F, const char *format, ...)
{
va_list args;
if (format != NULL)
{
va_start(args, format);
vsnprintf(F->desc, sizeof(F->desc), format, args);
va_end(args);
}
else
F->desc[0] = '\0';
}
/* Make sure stdio descriptors (0-2) and profiler descriptor (3)
* always go somewhere harmless. Use -foreground for profiling
* or executing from gdb */
void
close_standard_fds(void)
{
int i;
for (i = 0; i < LOWEST_SAFE_FD; i++)
{
close(i);
if (open("/dev/null", O_RDWR) < 0)
exit(-1); /* we're hosed if we can't even open /dev/null */
}
}
void
close_fds(fde_t *one)
{
int i;
fde_t *F;
for (i = 0; i < FD_HASH_SIZE; i++)
for (F = fd_hash[i]; F != NULL; F = F->hnext)
if (F != one)
close(F->fd);
}
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