trunk/src/fdlist.c

/*
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  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"  /* ConfigServerInfo */
#include "send.h"
#include "memory.h"
#include "numeric.h"
#include "misc.h"
#include "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 parc, char *parv[])
{
  for (unsigned int i = 0; i < FD_HASH_SIZE; ++i)
    for (fde_t *F = fd_hash[i]; F; F = F->hnext)
      sendto_one_numeric(source_p, &me, RPL_STATSDEBUG|SND_EXPLICIT,
                         "F :fd %-5d desc '%s'", 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)
  {
    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)
{
  for (unsigned int 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)
{
  for (unsigned int i = 0; i < FD_HASH_SIZE; ++i)
    for (fde_t *F = fd_hash[i]; F; F = F->hnext)
      if (F != one)
        close(F->fd);
}
Revision:	4565
Committed:	Sun Aug 24 10:27:40 2014 UTC (11 years ago) by michael
Content type:	text/x-csrc
File size:	4780 byte(s)
Log Message:	- Update GPL 2 license headers
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2916	* Copyright (c) 1997-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18	michael	4565	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	adx	30	* USA
20			*/
21	michael	1243
22	michael	2916	/*! \file fdlist.c
23			* \brief Maintains a list of file descriptors.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28			#include "fdlist.h"
29			#include "client.h" /* struct Client */
30			#include "event.h"
31			#include "ircd.h" /* GlobalSetOptions */
32			#include "irc_string.h"
33			#include "s_bsd.h" /* comm_setselect */
34	michael	4340	#include "conf.h" /* ConfigServerInfo */
35	adx	30	#include "send.h"
36			#include "memory.h"
37			#include "numeric.h"
38	michael	3347	#include "misc.h"
39	michael	3322	#include "res.h"
40	adx	30
41			fde_t *fd_hash[FD_HASH_SIZE];
42			fde_t *fd_next_in_loop = NULL;
43			int number_fd = LEAKED_FDS;
44			int hard_fdlimit = 0;
45
46
47	michael	1736	static int
48			set_fdlimit(void)
49	adx	30	{
50			int fdmax;
51			struct rlimit limit;
52
53	michael	1236	if (!getrlimit(RLIMIT_NOFILE, &limit))
54	adx	30	{
55			limit.rlim_cur = limit.rlim_max;
56	michael	1236	setrlimit(RLIMIT_NOFILE, &limit);
57	adx	30	}
58
59			fdmax = getdtablesize();
60
61			/* allow MAXCLIENTS_MIN clients even at the cost of MAX_BUFFER and
62			* some not really LEAKED_FDS */
63			fdmax = IRCD_MAX(fdmax, LEAKED_FDS + MAX_BUFFER + MAXCLIENTS_MIN);
64
65			/* under no condition shall this raise over 65536
66			* for example user ip heap is sized 2hard_fdlimit /
67	michael	1736	hard_fdlimit = IRCD_MIN(fdmax, 65536);
68	adx	30
69	michael	1736	return -1;
70	adx	30	}
71
72	michael	1736	void
73			fdlist_init(void)
74			{
75			set_fdlimit();
76			}
77
78	adx	30	static inline unsigned int
79			hash_fd(int fd)
80			{
81	michael	2916	return ((unsigned int)fd) % FD_HASH_SIZE;
82	adx	30	}
83
84			fde_t *
85			lookup_fd(int fd)
86			{
87			fde_t *F = fd_hash[hash_fd(fd)];
88
89			while (F)
90			{
91			if (F->fd == fd)
92	michael	2916	return F;
93	adx	30	F = F->hnext;
94			}
95
96	michael	2916	return NULL;
97	adx	30	}
98
99			/* Called to open a given filedescriptor */
100			void
101			fd_open(fde_t F, int fd, int is_socket, const char desc)
102			{
103			unsigned int hashv = hash_fd(fd);
104			assert(fd >= 0);
105
106			F->fd = fd;
107			F->comm_index = -1;
108	michael	3602
109	adx	30	if (desc)
110			strlcpy(F->desc, desc, sizeof(F->desc));
111	michael	3602
112	adx	30	/* Note: normally we'd have to clear the other flags,
113			* but currently F is always cleared before calling us.. */
114			F->flags.open = 1;
115			F->flags.is_socket = is_socket;
116			F->hnext = fd_hash[hashv];
117			fd_hash[hashv] = F;
118
119			number_fd++;
120			}
121
122			/* Called to close a given filedescriptor */
123			void
124			fd_close(fde_t *F)
125			{
126			unsigned int hashv = hash_fd(F->fd);
127
128			if (F == fd_next_in_loop)
129			fd_next_in_loop = F->hnext;
130
131			if (F->flags.is_socket)
132			comm_setselect(F, COMM_SELECT_WRITE \| COMM_SELECT_READ, NULL, NULL, 0);
133
134	michael	992	delete_resolver_queries(F);
135	adx	30
136			#ifdef HAVE_LIBCRYPTO
137			if (F->ssl)
138			SSL_free(F->ssl);
139			#endif
140
141			if (fd_hash[hashv] == F)
142			fd_hash[hashv] = F->hnext;
143	michael	3602	else
144			{
145	adx	30	fde_t *prev;
146
147			/* let it core if not found */
148			for (prev = fd_hash[hashv]; prev->hnext != F; prev = prev->hnext)
149			;
150			prev->hnext = F->hnext;
151			}
152
153			/* Unlike squid, we're actually closing the FD here! -- adrian */
154			close(F->fd);
155			number_fd--;
156	michael	436
157			memset(F, 0, sizeof(fde_t));
158	adx	30	}
159
160			/*
161			* fd_dump() - dump the list of active filedescriptors
162			*/
163			void
164	michael	4479	fd_dump(struct Client source_p, int parc, char parv[])
165	adx	30	{
166	michael	3589	for (unsigned int i = 0; i < FD_HASH_SIZE; ++i)
167			for (fde_t *F = fd_hash[i]; F; F = F->hnext)
168			sendto_one_numeric(source_p, &me, RPL_STATSDEBUG\|SND_EXPLICIT,
169			"F :fd %-5d desc '%s'", F->fd, F->desc);
170	adx	30	}
171
172			/*
173			* fd_note() - set the fd note
174			*
175			* Note: must be careful not to overflow fd_table[fd].desc when
176			* calling.
177			*/
178			void
179			fd_note(fde_t F, const char format, ...)
180			{
181			va_list args;
182
183	michael	3600	if (format)
184	adx	30	{
185			va_start(args, format);
186			vsnprintf(F->desc, sizeof(F->desc), format, args);
187			va_end(args);
188			}
189			else
190			F->desc[0] = '\0';
191			}
192
193			/* Make sure stdio descriptors (0-2) and profiler descriptor (3)
194			* always go somewhere harmless. Use -foreground for profiling
195			* or executing from gdb */
196			void
197			close_standard_fds(void)
198			{
199	michael	3600	for (unsigned int i = 0; i < LOWEST_SAFE_FD; ++i)
200	adx	30	{
201			close(i);
202	michael	3600
203	michael	1329	if (open("/dev/null", O_RDWR) < 0)
204	adx	30	exit(-1); /* we're hosed if we can't even open /dev/null */
205			}
206			}
207
208			void
209			close_fds(fde_t *one)
210			{
211	michael	3600	for (unsigned int i = 0; i < FD_HASH_SIZE; ++i)
212	michael	3602	for (fde_t *F = fd_hash[i]; F; F = F->hnext)
213	adx	30	if (F != one)
214			close(F->fd);
215			}