trunk/src/s_bsd.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2020 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 s_bsd.c
 * \brief Network functions.
 * \version $Id$
 */

#include "stdinc.h"
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include "list.h"
#include "fdlist.h"
#include "s_bsd.h"
#include "client.h"
#include "dbuf.h"
#include "event.h"
#include "irc_string.h"
#include "ircd.h"
#include "listener.h"
#include "numeric.h"
#include "packet.h"
#include "res.h"
#include "restart.h"
#include "conf.h"
#include "log.h"
#include "server.h"
#include "send.h"
#include "memory.h"
#include "user.h"


static const char *const comm_err_str[] =
{
  [COMM_OK] = "Comm OK",
  [COMM_ERR_BIND] = "Error during bind()",
  [COMM_ERR_TIMEOUT] = "connect timeout",
  [COMM_ERR_CONNECT] = "Error during connect()",
  [COMM_ERROR] = "Comm Error"
};

static void comm_connect_callback(fde_t *, int);
static void comm_connect_timeout(fde_t *, void *);
static void comm_connect_tryconnect(fde_t *, void *);


/* comm_get_sockerr - get the error value from the socket or the current errno
 *
 * Get the *real* error from the socket (well try to anyway..).
 * This may only work when SO_DEBUG is enabled but its worth the
 * gamble anyway.
 */
int
comm_get_sockerr(fde_t *F)
{
  int errtmp = errno;
#ifdef SO_ERROR
  int err = 0;
  socklen_t len = sizeof(err);

  assert(F);
  assert(F->flags.open == true);

  if (getsockopt(F->fd, SOL_SOCKET, SO_ERROR, &err, &len) == 0)
  {
    if (err)
      errtmp = err;
  }

  errno = errtmp;
#endif
  return errtmp;
}

/*
 * report_error - report an error from an errno.
 * Record error to log and also send a copy to all *LOCAL* opers online.
 *
 *        text        is a *format* string for outputing error. It must
 *                contain only two '%s', the first will be replaced
 *                by the sockhost from the client, and the latter will
 *                be taken from sys_errlist[errno].
 *
 *        client        if not NULL, is the *LOCAL* client associated with
 *                the error.
 *
 * Cannot use perror() within daemon. stderr is closed in
 * ircd and cannot be used. And, worse yet, it might have
 * been reassigned to a normal connection...
 *
 * Actually stderr is still there IFF ircd was run with -s --Rodder
 */
void
report_error(int level, const char *text, const char *who, int error)
{
  who = (who) ? who : "";

  sendto_realops_flags(UMODE_DEBUG, level, SEND_NOTICE,
                       text, who, strerror(error));
  ilog(LOG_TYPE_IRCD, text, who, strerror(error));
}

/*
 * setup_socket()
 *
 * Set the socket non-blocking, and other wonderful bits.
 */
static void
setup_socket(int fd)
{
  int opt = 1;

  setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));

#ifdef IPTOS_LOWDELAY
  opt = IPTOS_LOWDELAY;
  setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
#endif

#ifdef TCP_QUICKACK
  opt = 1;
  setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &opt, sizeof(opt));
#endif

  fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
}

/*
 * ssl_handshake - let OpenSSL initialize the protocol. Register for
 * read/write events if necessary.
 */
static void
ssl_handshake(fde_t *F, void *data)
{
  struct Client *client = data;

  assert(client);
  assert(client->connection);
  assert(client->connection->fd);
  assert(client->connection->fd == F);

  tls_handshake_status_t ret = tls_handshake(&F->tls, TLS_ROLE_SERVER, NULL);
  if (ret != TLS_HANDSHAKE_DONE)
  {
    if ((event_base->time.sec_monotonic - client->connection->created_monotonic) > TLS_HANDSHAKE_TIMEOUT)
    {
      exit_client(client, "Timeout during TLS handshake");
      return;
    }

    switch (ret)
    {
      case TLS_HANDSHAKE_WANT_WRITE:
        comm_setselect(F, COMM_SELECT_WRITE, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
        return;
      case TLS_HANDSHAKE_WANT_READ:
        comm_setselect(F, COMM_SELECT_READ, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
        return;
      default:
        exit_client(client, "Error during TLS handshake");
        return;
    }
  }

  comm_settimeout(F, 0, NULL, NULL);

  if (tls_verify_certificate(&F->tls, ConfigServerInfo.message_digest_algorithm, &client->tls_certfp) == false)
    ilog(LOG_TYPE_IRCD, "Client %s gave bad TLS client certificate",
         client_get_name(client, MASK_IP));

  auth_start(client);
}

/*
 * add_connection - creates a client which has just connected to us on
 * the given fd. The sockhost field is initialized with the ip# of the host.
 * An unique id is calculated now, in case it is needed for auth.
 * The client is sent to the auth module for verification, and not put in
 * any client list yet.
 */
void
add_connection(struct Listener *listener, struct irc_ssaddr *irn, int fd)
{
  struct Client *client = client_make(NULL);

  client->connection->fd = fd_open(fd, true, listener_has_flag(listener, LISTENER_TLS) ?
                                   "Incoming TLS connection" : "Incoming connection");

  /*
   * copy address to 'sockhost' as a string, copy it to host too
   * so we have something valid to put into error messages...
   */
  client->ip = *irn;

  getnameinfo((const struct sockaddr *)&client->ip,
              client->ip.ss_len, client->sockhost,
              sizeof(client->sockhost), NULL, 0, NI_NUMERICHOST);

  if (client->sockhost[0] == ':')
  {
    client->sockhost[0] = '0';
    memmove(client->sockhost + 1, client->sockhost, sizeof(client->sockhost) - 1);
  }

  strlcpy(client->host, client->sockhost, sizeof(client->host));

  client->connection->listener = listener;
  ++listener->ref_count;

  if (listener_has_flag(listener, LISTENER_TLS))
  {
    if (tls_new(&client->connection->fd->tls, fd, TLS_ROLE_SERVER) == false)
    {
      SetDead(client);
      exit_client(client, "TLS context initialization failed");
      return;
    }

    AddFlag(client, FLAGS_TLS);
    ssl_handshake(client->connection->fd, client);
  }
  else
    auth_start(client);
}

/*
 * stolen from squid - its a neat (but overused! :) routine which we
 * can use to see whether we can ignore this errno or not. It is
 * generally useful for non-blocking network IO related errnos.
 *     -- adrian
 */
bool
comm_ignore_errno(int ierrno)
{
  switch (ierrno)
  {
    case EINPROGRESS:
    case EWOULDBLOCK:
#if EAGAIN != EWOULDBLOCK
    case EAGAIN:
#endif
    case EALREADY:
    case EINTR:
#ifdef ERESTART
    case ERESTART:
#endif
      return true;
    default:
      return false;
  }
}

/*
 * comm_settimeout() - set the socket timeout
 *
 * Set the timeout for the fd
 */
void
comm_settimeout(fde_t *F, uintmax_t timeout, void (*callback)(fde_t *, void *), void *cbdata)
{
  assert(F);
  assert(F->flags.open == true);

  F->timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
  F->timeout_handler = callback;
  F->timeout_data = cbdata;
}

/*
 * comm_setflush() - set a flush function
 *
 * A flush function is simply a function called if found during
 * comm_timeouts(). Its basically a second timeout, except in this case
 * I'm too lazy to implement multiple timeout functions! :-)
 * its kinda nice to have it separate, since this is designed for
 * flush functions, and when comm_close() is implemented correctly
 * with close functions, we _actually_ don't call comm_close() here ..
 * -- originally Adrian's notes
 * comm_close() is replaced with fd_close() in fdlist.c
 */
void
comm_setflush(fde_t *F, uintmax_t timeout, void (*callback)(fde_t *, void *), void *cbdata)
{
  assert(F);
  assert(F->flags.open == true);

  F->flush_timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
  F->flush_handler = callback;
  F->flush_data = cbdata;
}

/*
 * comm_checktimeouts() - check the socket timeouts
 *
 * All this routine does is call the given callback/cbdata, without closing
 * down the file descriptor. When close handlers have been implemented,
 * this will happen.
 */
void
comm_checktimeouts(void *unused)
{
  for (int fd = 0; fd <= highest_fd; ++fd)
  {
    fde_t *F = &fd_table[fd];

    if (F->flags.open == false)
      continue;

    /* check flush functions */
    if (F->flush_timeout && F->flush_timeout < event_base->time.sec_monotonic)
    {
      void (*hdl)(fde_t *, void *) = F->flush_handler;
      void *data = F->flush_data;

      comm_setflush(F, 0, NULL, NULL);
      hdl(F, data);
    }

    /* check timeouts */
    if (F->timeout && F->timeout < event_base->time.sec_monotonic)
    {
      /* Call timeout handler */
      void (*hdl)(fde_t *, void *) = F->timeout_handler;
      void *data = F->timeout_data;

      comm_settimeout(F, 0, NULL, NULL);
      hdl(F, data);
    }
  }
}

/*
 * void comm_connect_tcp(int fd, const char *host, unsigned short port,
 *                       struct sockaddr *clocal, int socklen,
 *                       CNCB *callback, void *data, int aftype, int timeout)
 * Input: An fd to connect with, a host and port to connect to,
 *        a local sockaddr to connect from + length(or NULL to use the
 *        default), a callback, the data to pass into the callback, the
 *        address family.
 * Output: None.
 * Side-effects: A non-blocking connection to the host is started, and
 *               if necessary, set up for selection. The callback given
 *               may be called now, or it may be called later.
 */
void
comm_connect_tcp(fde_t *F, const struct irc_ssaddr *caddr, unsigned short port, const struct irc_ssaddr *baddr,
                 void (*callback)(fde_t *, int, void *), void *data, uintmax_t timeout)
{
  assert(callback);

  F->connect.hostaddr = *caddr;
  /* The cast is hacky, but safe - port offset is same on v4 and v6 */
  ((struct sockaddr_in *)&F->connect.hostaddr)->sin_port = htons(port);
  F->connect.callback = callback;
  F->connect.data = data;

  /* Note that we're using a passed sockaddr here. This is because
   * generally you'll be bind()ing to a sockaddr grabbed from
   * getsockname(), so this makes things easier.
   * XXX If NULL is passed as local, we should later on bind() to the
   * virtual host IP, for completeness.
   *   -- adrian
   */
  if (baddr && bind(F->fd, (const struct sockaddr *)baddr, baddr->ss_len) < 0)
  {
    /* Failure, call the callback with COMM_ERR_BIND */
    comm_connect_callback(F, COMM_ERR_BIND);
    return;  /* ... and quit */
  }

  comm_settimeout(F, timeout, comm_connect_timeout, NULL);
  comm_connect_tryconnect(F, NULL);
}

/*
 * comm_connect_callback() - call the callback, and continue with life
 */
static void
comm_connect_callback(fde_t *F, int status)
{
  void (*hdl)(fde_t *, int, void *);

  /* This check is gross..but probably necessary */
  if (F->connect.callback == NULL)
    return;

  /* Clear the connect flag + handler */
  hdl = F->connect.callback;
  F->connect.callback = NULL;

  /* Clear the timeout handler */
  comm_settimeout(F, 0, NULL, NULL);

  /* Call the handler */
  hdl(F, status, F->connect.data);
}

/*
 * comm_connect_timeout() - this gets called when the socket connection
 * times out. This *only* can be called once connect() is initially
 * called ..
 */
static void
comm_connect_timeout(fde_t *F, void *unused)
{
  /* error! */
  comm_connect_callback(F, COMM_ERR_TIMEOUT);
}

/* static void comm_connect_tryconnect(fde_t *fd, void *unused)
 * Input: The fd, the handler data(unused).
 * Output: None.
 * Side-effects: Try and connect with pending connect data for the FD. If
 *               we succeed or get a fatal error, call the callback.
 *               Otherwise, it is still blocking or something, so register
 *               to select for a write event on this FD.
 */
static void
comm_connect_tryconnect(fde_t *F, void *unused)
{
  /* This check is needed or re-entrant s_bsd_* like sigio break it. */
  if (F->connect.callback == NULL)
    return;

  /* Try the connect() */
  int retval = connect(F->fd, (struct sockaddr *)&F->connect.hostaddr, F->connect.hostaddr.ss_len);

  /* Error? */
  if (retval < 0)
  {
    /*
     * If we get EISCONN, then we've already connect()ed the socket,
     * which is a good thing.
     *   -- adrian
     */
    if (errno == EISCONN)
      comm_connect_callback(F, COMM_OK);
    else if (comm_ignore_errno(errno))
      /* Ignore error? Reschedule */
      comm_setselect(F, COMM_SELECT_WRITE, comm_connect_tryconnect, NULL, 0);
    else
      /* Error? Fail with COMM_ERR_CONNECT */
      comm_connect_callback(F, COMM_ERR_CONNECT);
    return;
  }

  /* If we get here, we've suceeded, so call with COMM_OK */
  comm_connect_callback(F, COMM_OK);
}

/*
 * comm_errorstr() - return an error string for the given error condition
 */
const char *
comm_errstr(int error)
{
  if (error < 0 || error >= COMM_ERR_MAX)
    return "Invalid error number!";
  return comm_err_str[error];
}

/*
 * comm_open() - open a socket
 *
 * This is a highly highly cut down version of squid's comm_open() which
 * for the most part emulates socket(), *EXCEPT* it fails if we're about
 * to run out of file descriptors.
 */
int
comm_socket(int family, int sock_type, int proto)
{
  /* First, make sure we aren't going to run out of file descriptors */
  if (number_fd >= hard_fdlimit)
  {
    errno = ENFILE;
    return -1;
  }

  /*
   * Next, we try to open the socket. We *should* drop the reserved FD
   * limit if/when we get an error, but we can deal with that later.
   * XXX !!! -- adrian
   */
  int fd = socket(family, sock_type, proto);
  if (fd < 0)
    return -1; /* errno will be passed through, yay.. */

  setup_socket(fd);

  return fd;
}

/*
 * comm_accept() - accept an incoming connection
 *
 * This is a simple wrapper for accept() which enforces FD limits like
 * comm_open() does. Returned fd must be either closed or tagged with
 * fd_open (this function no longer does it).
 */
int
comm_accept(fde_t *F, struct irc_ssaddr *addr)
{
  socklen_t addrlen = sizeof(struct irc_ssaddr);

  if (number_fd >= hard_fdlimit)
  {
    errno = ENFILE;
    return -1;
  }

  memset(addr, 0, sizeof(*addr));

  /*
   * Next, do the accept(). if we get an error, we should drop the
   * reserved fd limit, but we can deal with that when comm_open()
   * also does it. XXX -- adrian
   */
  int fd = accept(F->fd, (struct sockaddr *)addr, &addrlen);
  if (fd < 0)
    return -1;

  remove_ipv6_mapping(addr);

  setup_socket(fd);

  /* .. and return */
  return fd;
}

/*
 * remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
 * OSes with IPv6 mapping listening on both
 * AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
 *
 */
void
remove_ipv6_mapping(struct irc_ssaddr *addr)
{
  if (addr->ss.ss_family == AF_INET6)
  {
    if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
    {
      struct sockaddr_in6 v6;
      struct sockaddr_in *v4 = (struct sockaddr_in *)addr;

      memcpy(&v6, addr, sizeof(v6));
      memset(v4, 0, sizeof(struct sockaddr_in));
      memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));

      addr->ss.ss_family = AF_INET;
      addr->ss_len = sizeof(struct sockaddr_in);
    }
    else
      addr->ss_len = sizeof(struct sockaddr_in6);
  }
  else
    addr->ss_len = sizeof(struct sockaddr_in);
}
Revision:	9590
Committed:	Sat Aug 29 14:23:01 2020 UTC (4 years, 11 months ago) by michael
Content type:	text/x-csrc
File size:	15977 byte(s)
Log Message:	- Make use of listener_has_flag() in various places; client-only listeners are now marked with a 'C' in "/stats P"
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 1997-2020 ircd-hybrid development team
5	*
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	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file s_bsd.c
23	* \brief Network functions.
24	* \version $Id$
25	*/
26
27	#include "stdinc.h"
28	#include <netinet/in_systm.h>
29	#include <netinet/ip.h>
30	#include <netinet/tcp.h>
31	#include "list.h"
32	#include "fdlist.h"
33	#include "s_bsd.h"
34	#include "client.h"
35	#include "dbuf.h"
36	#include "event.h"
37	#include "irc_string.h"
38	#include "ircd.h"
39	#include "listener.h"
40	#include "numeric.h"
41	#include "packet.h"
42	#include "res.h"
43	#include "restart.h"
44	#include "conf.h"
45	#include "log.h"
46	#include "server.h"
47	#include "send.h"
48	#include "memory.h"
49	#include "user.h"
50
51
52	static const char *const comm_err_str[] =
53	{
54	[COMM_OK] = "Comm OK",
55	[COMM_ERR_BIND] = "Error during bind()",
56	[COMM_ERR_TIMEOUT] = "connect timeout",
57	[COMM_ERR_CONNECT] = "Error during connect()",
58	[COMM_ERROR] = "Comm Error"
59	};
60
61	static void comm_connect_callback(fde_t *, int);
62	static void comm_connect_timeout(fde_t , void );
63	static void comm_connect_tryconnect(fde_t , void );
64
65
66	/* comm_get_sockerr - get the error value from the socket or the current errno
67	*
68	* Get the real error from the socket (well try to anyway..).
69	* This may only work when SO_DEBUG is enabled but its worth the
70	* gamble anyway.
71	*/
72	int
73	comm_get_sockerr(fde_t *F)
74	{
75	int errtmp = errno;
76	#ifdef SO_ERROR
77	int err = 0;
78	socklen_t len = sizeof(err);
79
80	assert(F);
81	assert(F->flags.open == true);
82
83	if (getsockopt(F->fd, SOL_SOCKET, SO_ERROR, &err, &len) == 0)
84	{
85	if (err)
86	errtmp = err;
87	}
88
89	errno = errtmp;
90	#endif
91	return errtmp;
92	}
93
94	/*
95	* report_error - report an error from an errno.
96	* Record error to log and also send a copy to all LOCAL opers online.
97	*
98	* text is a format string for outputing error. It must
99	* contain only two '%s', the first will be replaced
100	* by the sockhost from the client, and the latter will
101	* be taken from sys_errlist[errno].
102	*
103	* client if not NULL, is the LOCAL client associated with
104	* the error.
105	*
106	* Cannot use perror() within daemon. stderr is closed in
107	* ircd and cannot be used. And, worse yet, it might have
108	* been reassigned to a normal connection...
109	*
110	* Actually stderr is still there IFF ircd was run with -s --Rodder
111	*/
112	void
113	report_error(int level, const char text, const char who, int error)
114	{
115	who = (who) ? who : "";
116
117	sendto_realops_flags(UMODE_DEBUG, level, SEND_NOTICE,
118	text, who, strerror(error));
119	ilog(LOG_TYPE_IRCD, text, who, strerror(error));
120	}
121
122	/*
123	* setup_socket()
124	*
125	* Set the socket non-blocking, and other wonderful bits.
126	*/
127	static void
128	setup_socket(int fd)
129	{
130	int opt = 1;
131
132	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
133
134	#ifdef IPTOS_LOWDELAY
135	opt = IPTOS_LOWDELAY;
136	setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
137	#endif
138
139	#ifdef TCP_QUICKACK
140	opt = 1;
141	setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &opt, sizeof(opt));
142	#endif
143
144	fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) \| O_NONBLOCK);
145	}
146
147	/*
148	* ssl_handshake - let OpenSSL initialize the protocol. Register for
149	* read/write events if necessary.
150	*/
151	static void
152	ssl_handshake(fde_t F, void data)
153	{
154	struct Client *client = data;
155
156	assert(client);
157	assert(client->connection);
158	assert(client->connection->fd);
159	assert(client->connection->fd == F);
160
161	tls_handshake_status_t ret = tls_handshake(&F->tls, TLS_ROLE_SERVER, NULL);
162	if (ret != TLS_HANDSHAKE_DONE)
163	{
164	if ((event_base->time.sec_monotonic - client->connection->created_monotonic) > TLS_HANDSHAKE_TIMEOUT)
165	{
166	exit_client(client, "Timeout during TLS handshake");
167	return;
168	}
169
170	switch (ret)
171	{
172	case TLS_HANDSHAKE_WANT_WRITE:
173	comm_setselect(F, COMM_SELECT_WRITE, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
174	return;
175	case TLS_HANDSHAKE_WANT_READ:
176	comm_setselect(F, COMM_SELECT_READ, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
177	return;
178	default:
179	exit_client(client, "Error during TLS handshake");
180	return;
181	}
182	}
183
184	comm_settimeout(F, 0, NULL, NULL);
185
186	if (tls_verify_certificate(&F->tls, ConfigServerInfo.message_digest_algorithm, &client->tls_certfp) == false)
187	ilog(LOG_TYPE_IRCD, "Client %s gave bad TLS client certificate",
188	client_get_name(client, MASK_IP));
189
190	auth_start(client);
191	}
192
193	/*
194	* add_connection - creates a client which has just connected to us on
195	* the given fd. The sockhost field is initialized with the ip# of the host.
196	* An unique id is calculated now, in case it is needed for auth.
197	* The client is sent to the auth module for verification, and not put in
198	* any client list yet.
199	*/
200	void
201	add_connection(struct Listener listener, struct irc_ssaddr irn, int fd)
202	{
203	struct Client *client = client_make(NULL);
204
205	client->connection->fd = fd_open(fd, true, listener_has_flag(listener, LISTENER_TLS) ?
206	"Incoming TLS connection" : "Incoming connection");
207
208	/*
209	* copy address to 'sockhost' as a string, copy it to host too
210	* so we have something valid to put into error messages...
211	*/
212	client->ip = *irn;
213
214	getnameinfo((const struct sockaddr *)&client->ip,
215	client->ip.ss_len, client->sockhost,
216	sizeof(client->sockhost), NULL, 0, NI_NUMERICHOST);
217
218	if (client->sockhost[0] == ':')
219	{
220	client->sockhost[0] = '0';
221	memmove(client->sockhost + 1, client->sockhost, sizeof(client->sockhost) - 1);
222	}
223
224	strlcpy(client->host, client->sockhost, sizeof(client->host));
225
226	client->connection->listener = listener;
227	++listener->ref_count;
228
229	if (listener_has_flag(listener, LISTENER_TLS))
230	{
231	if (tls_new(&client->connection->fd->tls, fd, TLS_ROLE_SERVER) == false)
232	{
233	SetDead(client);
234	exit_client(client, "TLS context initialization failed");
235	return;
236	}
237
238	AddFlag(client, FLAGS_TLS);
239	ssl_handshake(client->connection->fd, client);
240	}
241	else
242	auth_start(client);
243	}
244
245	/*
246	* stolen from squid - its a neat (but overused! :) routine which we
247	* can use to see whether we can ignore this errno or not. It is
248	* generally useful for non-blocking network IO related errnos.
249	* -- adrian
250	*/
251	bool
252	comm_ignore_errno(int ierrno)
253	{
254	switch (ierrno)
255	{
256	case EINPROGRESS:
257	case EWOULDBLOCK:
258	#if EAGAIN != EWOULDBLOCK
259	case EAGAIN:
260	#endif
261	case EALREADY:
262	case EINTR:
263	#ifdef ERESTART
264	case ERESTART:
265	#endif
266	return true;
267	default:
268	return false;
269	}
270	}
271
272	/*
273	* comm_settimeout() - set the socket timeout
274	*
275	* Set the timeout for the fd
276	*/
277	void
278	comm_settimeout(fde_t F, uintmax_t timeout, void (callback)(fde_t , void ), void *cbdata)
279	{
280	assert(F);
281	assert(F->flags.open == true);
282
283	F->timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
284	F->timeout_handler = callback;
285	F->timeout_data = cbdata;
286	}
287
288	/*
289	* comm_setflush() - set a flush function
290	*
291	* A flush function is simply a function called if found during
292	* comm_timeouts(). Its basically a second timeout, except in this case
293	* I'm too lazy to implement multiple timeout functions! :-)
294	* its kinda nice to have it separate, since this is designed for
295	* flush functions, and when comm_close() is implemented correctly
296	* with close functions, we _actually_ don't call comm_close() here ..
297	* -- originally Adrian's notes
298	* comm_close() is replaced with fd_close() in fdlist.c
299	*/
300	void
301	comm_setflush(fde_t F, uintmax_t timeout, void (callback)(fde_t , void ), void *cbdata)
302	{
303	assert(F);
304	assert(F->flags.open == true);
305
306	F->flush_timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
307	F->flush_handler = callback;
308	F->flush_data = cbdata;
309	}
310
311	/*
312	* comm_checktimeouts() - check the socket timeouts
313	*
314	* All this routine does is call the given callback/cbdata, without closing
315	* down the file descriptor. When close handlers have been implemented,
316	* this will happen.
317	*/
318	void
319	comm_checktimeouts(void *unused)
320	{
321	for (int fd = 0; fd <= highest_fd; ++fd)
322	{
323	fde_t *F = &fd_table[fd];
324
325	if (F->flags.open == false)
326	continue;
327
328	/* check flush functions */
329	if (F->flush_timeout && F->flush_timeout < event_base->time.sec_monotonic)
330	{
331	void (hdl)(fde_t , void *) = F->flush_handler;
332	void *data = F->flush_data;
333
334	comm_setflush(F, 0, NULL, NULL);
335	hdl(F, data);
336	}
337
338	/* check timeouts */
339	if (F->timeout && F->timeout < event_base->time.sec_monotonic)
340	{
341	/* Call timeout handler */
342	void (hdl)(fde_t , void *) = F->timeout_handler;
343	void *data = F->timeout_data;
344
345	comm_settimeout(F, 0, NULL, NULL);
346	hdl(F, data);
347	}
348	}
349	}
350
351	/*
352	* void comm_connect_tcp(int fd, const char *host, unsigned short port,
353	* struct sockaddr *clocal, int socklen,
354	* CNCB callback, void data, int aftype, int timeout)
355	* Input: An fd to connect with, a host and port to connect to,
356	* a local sockaddr to connect from + length(or NULL to use the
357	* default), a callback, the data to pass into the callback, the
358	* address family.
359	* Output: None.
360	* Side-effects: A non-blocking connection to the host is started, and
361	* if necessary, set up for selection. The callback given
362	* may be called now, or it may be called later.
363	*/
364	void
365	comm_connect_tcp(fde_t F, const struct irc_ssaddr caddr, unsigned short port, const struct irc_ssaddr *baddr,
366	void (callback)(fde_t , int, void ), void data, uintmax_t timeout)
367	{
368	assert(callback);
369
370	F->connect.hostaddr = *caddr;
371	/* The cast is hacky, but safe - port offset is same on v4 and v6 */
372	((struct sockaddr_in *)&F->connect.hostaddr)->sin_port = htons(port);
373	F->connect.callback = callback;
374	F->connect.data = data;
375
376	/* Note that we're using a passed sockaddr here. This is because
377	* generally you'll be bind()ing to a sockaddr grabbed from
378	* getsockname(), so this makes things easier.
379	* XXX If NULL is passed as local, we should later on bind() to the
380	* virtual host IP, for completeness.
381	* -- adrian
382	*/
383	if (baddr && bind(F->fd, (const struct sockaddr *)baddr, baddr->ss_len) < 0)
384	{
385	/* Failure, call the callback with COMM_ERR_BIND */
386	comm_connect_callback(F, COMM_ERR_BIND);
387	return; /* ... and quit */
388	}
389
390	comm_settimeout(F, timeout, comm_connect_timeout, NULL);
391	comm_connect_tryconnect(F, NULL);
392	}
393
394	/*
395	* comm_connect_callback() - call the callback, and continue with life
396	*/
397	static void
398	comm_connect_callback(fde_t *F, int status)
399	{
400	void (hdl)(fde_t , int, void *);
401
402	/* This check is gross..but probably necessary */
403	if (F->connect.callback == NULL)
404	return;
405
406	/* Clear the connect flag + handler */
407	hdl = F->connect.callback;
408	F->connect.callback = NULL;
409
410	/* Clear the timeout handler */
411	comm_settimeout(F, 0, NULL, NULL);
412
413	/* Call the handler */
414	hdl(F, status, F->connect.data);
415	}
416
417	/*
418	* comm_connect_timeout() - this gets called when the socket connection
419	* times out. This only can be called once connect() is initially
420	* called ..
421	*/
422	static void
423	comm_connect_timeout(fde_t F, void unused)
424	{
425	/* error! */
426	comm_connect_callback(F, COMM_ERR_TIMEOUT);
427	}
428
429	/* static void comm_connect_tryconnect(fde_t fd, void unused)
430	* Input: The fd, the handler data(unused).
431	* Output: None.
432	* Side-effects: Try and connect with pending connect data for the FD. If
433	* we succeed or get a fatal error, call the callback.
434	* Otherwise, it is still blocking or something, so register
435	* to select for a write event on this FD.
436	*/
437	static void
438	comm_connect_tryconnect(fde_t F, void unused)
439	{
440	/* This check is needed or re-entrant s_bsd_* like sigio break it. */
441	if (F->connect.callback == NULL)
442	return;
443
444	/* Try the connect() */
445	int retval = connect(F->fd, (struct sockaddr *)&F->connect.hostaddr, F->connect.hostaddr.ss_len);
446
447	/* Error? */
448	if (retval < 0)
449	{
450	/*
451	* If we get EISCONN, then we've already connect()ed the socket,
452	* which is a good thing.
453	* -- adrian
454	*/
455	if (errno == EISCONN)
456	comm_connect_callback(F, COMM_OK);
457	else if (comm_ignore_errno(errno))
458	/* Ignore error? Reschedule */
459	comm_setselect(F, COMM_SELECT_WRITE, comm_connect_tryconnect, NULL, 0);
460	else
461	/* Error? Fail with COMM_ERR_CONNECT */
462	comm_connect_callback(F, COMM_ERR_CONNECT);
463	return;
464	}
465
466	/* If we get here, we've suceeded, so call with COMM_OK */
467	comm_connect_callback(F, COMM_OK);
468	}
469
470	/*
471	* comm_errorstr() - return an error string for the given error condition
472	*/
473	const char *
474	comm_errstr(int error)
475	{
476	if (error < 0 \|\| error >= COMM_ERR_MAX)
477	return "Invalid error number!";
478	return comm_err_str[error];
479	}
480
481	/*
482	* comm_open() - open a socket
483	*
484	* This is a highly highly cut down version of squid's comm_open() which
485	* for the most part emulates socket(), EXCEPT it fails if we're about
486	* to run out of file descriptors.
487	*/
488	int
489	comm_socket(int family, int sock_type, int proto)
490	{
491	/* First, make sure we aren't going to run out of file descriptors */
492	if (number_fd >= hard_fdlimit)
493	{
494	errno = ENFILE;
495	return -1;
496	}
497
498	/*
499	* Next, we try to open the socket. We should drop the reserved FD
500	* limit if/when we get an error, but we can deal with that later.
501	* XXX !!! -- adrian
502	*/
503	int fd = socket(family, sock_type, proto);
504	if (fd < 0)
505	return -1; /* errno will be passed through, yay.. */
506
507	setup_socket(fd);
508
509	return fd;
510	}
511
512	/*
513	* comm_accept() - accept an incoming connection
514	*
515	* This is a simple wrapper for accept() which enforces FD limits like
516	* comm_open() does. Returned fd must be either closed or tagged with
517	* fd_open (this function no longer does it).
518	*/
519	int
520	comm_accept(fde_t F, struct irc_ssaddr addr)
521	{
522	socklen_t addrlen = sizeof(struct irc_ssaddr);
523
524	if (number_fd >= hard_fdlimit)
525	{
526	errno = ENFILE;
527	return -1;
528	}
529
530	memset(addr, 0, sizeof(*addr));
531
532	/*
533	* Next, do the accept(). if we get an error, we should drop the
534	* reserved fd limit, but we can deal with that when comm_open()
535	* also does it. XXX -- adrian
536	*/
537	int fd = accept(F->fd, (struct sockaddr *)addr, &addrlen);
538	if (fd < 0)
539	return -1;
540
541	remove_ipv6_mapping(addr);
542
543	setup_socket(fd);
544
545	/* .. and return */
546	return fd;
547	}
548
549	/*
550	* remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
551	* OSes with IPv6 mapping listening on both
552	* AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
553	*
554	*/
555	void
556	remove_ipv6_mapping(struct irc_ssaddr *addr)
557	{
558	if (addr->ss.ss_family == AF_INET6)
559	{
560	if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
561	{
562	struct sockaddr_in6 v6;
563	struct sockaddr_in v4 = (struct sockaddr_in )addr;
564
565	memcpy(&v6, addr, sizeof(v6));
566	memset(v4, 0, sizeof(struct sockaddr_in));
567	memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));
568
569	addr->ss.ss_family = AF_INET;
570	addr->ss_len = sizeof(struct sockaddr_in);
571	}
572	else
573	addr->ss_len = sizeof(struct sockaddr_in6);
574	}
575	else
576	addr->ss_len = sizeof(struct sockaddr_in);
577	}