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_p, and the latter will
 *                be taken from sys_errlist[errno].
 *
 *        client_p        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_p = data;

  assert(client_p);
  assert(client_p->connection);
  assert(client_p->connection->fd);
  assert(client_p->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_p->connection->created_monotonic) > TLS_HANDSHAKE_TIMEOUT)
    {
      exit_client(client_p, "Timeout during TLS handshake");
      return;
    }

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

  comm_settimeout(F, 0, NULL, NULL);

  if (tls_verify_cert(&F->tls, ConfigServerInfo.message_digest_algorithm, &client_p->certfp) == false)
    ilog(LOG_TYPE_IRCD, "Client %s!%s@%s gave bad TLS client certificate",
         client_p->name, client_p->username, client_p->host);

  auth_start(client_p);
}

/*
 * 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_p = client_make(NULL);

  client_p->connection->fd = fd_open(fd, true, (listener->flags & 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_p->ip = *irn;

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

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

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

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

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

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

/*
 * 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 = event_base->time.sec_monotonic + timeout;
  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 = event_base->time.sec_monotonic + timeout;
  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)
{
  void (*hdl)(fde_t *, void *);
  void *data;

  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_handler && F->flush_timeout > 0 &&
        F->flush_timeout < event_base->time.sec_monotonic)
    {
      hdl = F->flush_handler;
      data = F->flush_data;

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

    /* check timeouts */
    if (F->timeout_handler && F->timeout > 0 &&
        F->timeout < event_base->time.sec_monotonic)
    {
      /* Call timeout handler */
      hdl = F->timeout_handler;
      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:	9157
Committed:	Mon Jan 13 14:56:38 2020 UTC (6 years, 6 months ago) by michael
Content type:	text/x-csrc
File size:	16069 byte(s)
Log Message:	- Replaced most occurences of 'SSL' with 'TLS'
#	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_p, and the latter will
101	* be taken from sys_errlist[errno].
102	*
103	* client_p 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_p = data;
155
156	assert(client_p);
157	assert(client_p->connection);
158	assert(client_p->connection->fd);
159	assert(client_p->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_p->connection->created_monotonic) > TLS_HANDSHAKE_TIMEOUT)
165	{
166	exit_client(client_p, "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_p, TLS_HANDSHAKE_TIMEOUT);
174	return;
175	case TLS_HANDSHAKE_WANT_READ:
176	comm_setselect(F, COMM_SELECT_READ, ssl_handshake, client_p, TLS_HANDSHAKE_TIMEOUT);
177	return;
178	default:
179	exit_client(client_p, "Error during TLS handshake");
180	return;
181	}
182	}
183
184	comm_settimeout(F, 0, NULL, NULL);
185
186	if (tls_verify_cert(&F->tls, ConfigServerInfo.message_digest_algorithm, &client_p->certfp) == false)
187	ilog(LOG_TYPE_IRCD, "Client %s!%s@%s gave bad TLS client certificate",
188	client_p->name, client_p->username, client_p->host);
189
190	auth_start(client_p);
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_p = client_make(NULL);
204
205	client_p->connection->fd = fd_open(fd, true, (listener->flags & 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_p->ip = *irn;
213
214	getnameinfo((const struct sockaddr *)&client_p->ip,
215	client_p->ip.ss_len, client_p->sockhost,
216	sizeof(client_p->sockhost), NULL, 0, NI_NUMERICHOST);
217
218	if (client_p->sockhost[0] == ':')
219	{
220	client_p->sockhost[0] = '0';
221	memmove(client_p->sockhost + 1, client_p->sockhost, sizeof(client_p->sockhost) - 1);
222	}
223
224	strlcpy(client_p->host, client_p->sockhost, sizeof(client_p->host));
225
226	client_p->connection->listener = listener;
227	++listener->ref_count;
228
229	if (listener->flags & LISTENER_TLS)
230	{
231	if (tls_new(&client_p->connection->fd->tls, fd, TLS_ROLE_SERVER) == false)
232	{
233	SetDead(client_p);
234	exit_client(client_p, "TLS context initialization failed");
235	return;
236	}
237
238	AddFlag(client_p, FLAGS_TLS);
239	ssl_handshake(client_p->connection->fd, client_p);
240	}
241	else
242	auth_start(client_p);
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 = event_base->time.sec_monotonic + timeout;
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 = event_base->time.sec_monotonic + timeout;
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	void (hdl)(fde_t , void *);
322	void *data;
323
324	for (int fd = 0; fd <= highest_fd; ++fd)
325	{
326	fde_t *F = &fd_table[fd];
327
328	if (F->flags.open == false)
329	continue;
330
331	/* check flush functions */
332	if (F->flush_handler && F->flush_timeout > 0 &&
333	F->flush_timeout < event_base->time.sec_monotonic)
334	{
335	hdl = F->flush_handler;
336	data = F->flush_data;
337
338	comm_setflush(F, 0, NULL, NULL);
339	hdl(F, data);
340	}
341
342	/* check timeouts */
343	if (F->timeout_handler && F->timeout > 0 &&
344	F->timeout < event_base->time.sec_monotonic)
345	{
346	/* Call timeout handler */
347	hdl = F->timeout_handler;
348	data = F->timeout_data;
349
350	comm_settimeout(F, 0, NULL, NULL);
351	hdl(F, data);
352	}
353	}
354	}
355
356	/*
357	* void comm_connect_tcp(int fd, const char *host, unsigned short port,
358	* struct sockaddr *clocal, int socklen,
359	* CNCB callback, void data, int aftype, int timeout)
360	* Input: An fd to connect with, a host and port to connect to,
361	* a local sockaddr to connect from + length(or NULL to use the
362	* default), a callback, the data to pass into the callback, the
363	* address family.
364	* Output: None.
365	* Side-effects: A non-blocking connection to the host is started, and
366	* if necessary, set up for selection. The callback given
367	* may be called now, or it may be called later.
368	*/
369	void
370	comm_connect_tcp(fde_t F, const struct irc_ssaddr caddr, unsigned short port, const struct irc_ssaddr *baddr,
371	void (callback)(fde_t , int, void ), void data, uintmax_t timeout)
372	{
373	assert(callback);
374
375	F->connect.hostaddr = *caddr;
376	/* The cast is hacky, but safe - port offset is same on v4 and v6 */
377	((struct sockaddr_in *)&F->connect.hostaddr)->sin_port = htons(port);
378	F->connect.callback = callback;
379	F->connect.data = data;
380
381	/* Note that we're using a passed sockaddr here. This is because
382	* generally you'll be bind()ing to a sockaddr grabbed from
383	* getsockname(), so this makes things easier.
384	* XXX If NULL is passed as local, we should later on bind() to the
385	* virtual host IP, for completeness.
386	* -- adrian
387	*/
388	if (baddr && bind(F->fd, (const struct sockaddr *)baddr, baddr->ss_len) < 0)
389	{
390	/* Failure, call the callback with COMM_ERR_BIND */
391	comm_connect_callback(F, COMM_ERR_BIND);
392	return; /* ... and quit */
393	}
394
395	comm_settimeout(F, timeout, comm_connect_timeout, NULL);
396	comm_connect_tryconnect(F, NULL);
397	}
398
399	/*
400	* comm_connect_callback() - call the callback, and continue with life
401	*/
402	static void
403	comm_connect_callback(fde_t *F, int status)
404	{
405	void (hdl)(fde_t , int, void *);
406
407	/* This check is gross..but probably necessary */
408	if (F->connect.callback == NULL)
409	return;
410
411	/* Clear the connect flag + handler */
412	hdl = F->connect.callback;
413	F->connect.callback = NULL;
414
415	/* Clear the timeout handler */
416	comm_settimeout(F, 0, NULL, NULL);
417
418	/* Call the handler */
419	hdl(F, status, F->connect.data);
420	}
421
422	/*
423	* comm_connect_timeout() - this gets called when the socket connection
424	* times out. This only can be called once connect() is initially
425	* called ..
426	*/
427	static void
428	comm_connect_timeout(fde_t F, void unused)
429	{
430	/* error! */
431	comm_connect_callback(F, COMM_ERR_TIMEOUT);
432	}
433
434	/* static void comm_connect_tryconnect(fde_t fd, void unused)
435	* Input: The fd, the handler data(unused).
436	* Output: None.
437	* Side-effects: Try and connect with pending connect data for the FD. If
438	* we succeed or get a fatal error, call the callback.
439	* Otherwise, it is still blocking or something, so register
440	* to select for a write event on this FD.
441	*/
442	static void
443	comm_connect_tryconnect(fde_t F, void unused)
444	{
445	/* This check is needed or re-entrant s_bsd_* like sigio break it. */
446	if (F->connect.callback == NULL)
447	return;
448
449	/* Try the connect() */
450	int retval = connect(F->fd, (struct sockaddr *)&F->connect.hostaddr, F->connect.hostaddr.ss_len);
451
452	/* Error? */
453	if (retval < 0)
454	{
455	/*
456	* If we get EISCONN, then we've already connect()ed the socket,
457	* which is a good thing.
458	* -- adrian
459	*/
460	if (errno == EISCONN)
461	comm_connect_callback(F, COMM_OK);
462	else if (comm_ignore_errno(errno))
463	/* Ignore error? Reschedule */
464	comm_setselect(F, COMM_SELECT_WRITE, comm_connect_tryconnect, NULL, 0);
465	else
466	/* Error? Fail with COMM_ERR_CONNECT */
467	comm_connect_callback(F, COMM_ERR_CONNECT);
468	return;
469	}
470
471	/* If we get here, we've suceeded, so call with COMM_OK */
472	comm_connect_callback(F, COMM_OK);
473	}
474
475	/*
476	* comm_errorstr() - return an error string for the given error condition
477	*/
478	const char *
479	comm_errstr(int error)
480	{
481	if (error < 0 \|\| error >= COMM_ERR_MAX)
482	return "Invalid error number!";
483	return comm_err_str[error];
484	}
485
486	/*
487	* comm_open() - open a socket
488	*
489	* This is a highly highly cut down version of squid's comm_open() which
490	* for the most part emulates socket(), EXCEPT it fails if we're about
491	* to run out of file descriptors.
492	*/
493	int
494	comm_socket(int family, int sock_type, int proto)
495	{
496	/* First, make sure we aren't going to run out of file descriptors */
497	if (number_fd >= hard_fdlimit)
498	{
499	errno = ENFILE;
500	return -1;
501	}
502
503	/*
504	* Next, we try to open the socket. We should drop the reserved FD
505	* limit if/when we get an error, but we can deal with that later.
506	* XXX !!! -- adrian
507	*/
508	int fd = socket(family, sock_type, proto);
509	if (fd < 0)
510	return -1; /* errno will be passed through, yay.. */
511
512	setup_socket(fd);
513
514	return fd;
515	}
516
517	/*
518	* comm_accept() - accept an incoming connection
519	*
520	* This is a simple wrapper for accept() which enforces FD limits like
521	* comm_open() does. Returned fd must be either closed or tagged with
522	* fd_open (this function no longer does it).
523	*/
524	int
525	comm_accept(fde_t F, struct irc_ssaddr addr)
526	{
527	socklen_t addrlen = sizeof(struct irc_ssaddr);
528
529	if (number_fd >= hard_fdlimit)
530	{
531	errno = ENFILE;
532	return -1;
533	}
534
535	memset(addr, 0, sizeof(*addr));
536
537	/*
538	* Next, do the accept(). if we get an error, we should drop the
539	* reserved fd limit, but we can deal with that when comm_open()
540	* also does it. XXX -- adrian
541	*/
542	int fd = accept(F->fd, (struct sockaddr *)addr, &addrlen);
543	if (fd < 0)
544	return -1;
545
546	remove_ipv6_mapping(addr);
547
548	setup_socket(fd);
549
550	/* .. and return */
551	return fd;
552	}
553
554	/*
555	* remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
556	* OSes with IPv6 mapping listening on both
557	* AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
558	*
559	*/
560	void
561	remove_ipv6_mapping(struct irc_ssaddr *addr)
562	{
563	if (addr->ss.ss_family == AF_INET6)
564	{
565	if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
566	{
567	struct sockaddr_in6 v6;
568	struct sockaddr_in v4 = (struct sockaddr_in )addr;
569
570	memcpy(&v6, addr, sizeof(v6));
571	memset(v4, 0, sizeof(struct sockaddr_in));
572	memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));
573
574	addr->ss.ss_family = AF_INET;
575	addr->ss_len = sizeof(struct sockaddr_in);
576	}
577	else
578	addr->ss_len = sizeof(struct sockaddr_in6);
579	}
580	else
581	addr->ss_len = sizeof(struct sockaddr_in);
582	}