trunk/src/s_bsd.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2021 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[1] == ':')
  {
    memmove(client->sockhost + 1, client->sockhost, sizeof(client->sockhost) - 1);
    client->sockhost[0] = '0';
  }

  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:	9892
Committed:	Sat Jan 16 18:20:59 2021 UTC (5 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	16013 byte(s)
Log Message:	- s_bsd.c:add_connection(): fixed stupidly broken 'ipv6 loopback address irc-sanitizer' logic
#	User	Rev	Content
1	adx	30	/*
2	michael	2916	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	9857	* Copyright (c) 1997-2021 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
22	michael	2916	/*! \file s_bsd.c
23			* \brief Network functions.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28			#include <netinet/in_systm.h>
29			#include <netinet/ip.h>
30			#include <netinet/tcp.h>
31	michael	1011	#include "list.h"
32	adx	30	#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	michael	3322	#include "res.h"
43	adx	30	#include "restart.h"
44	michael	1309	#include "conf.h"
45			#include "log.h"
46	michael	3347	#include "server.h"
47	adx	30	#include "send.h"
48			#include "memory.h"
49	michael	3347	#include "user.h"
50	adx	30
51	michael	3274
52	michael	5887	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	adx	30
61	michael	1013	static void comm_connect_callback(fde_t *, int);
62	michael	4461	static void comm_connect_timeout(fde_t , void );
63			static void comm_connect_tryconnect(fde_t , void );
64	adx	30
65
66	michael	8414	/* comm_get_sockerr - get the error value from the socket or the current errno
67	adx	30	*
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	michael	8826	comm_get_sockerr(fde_t *F)
74	adx	30	{
75			int errtmp = errno;
76			#ifdef SO_ERROR
77			int err = 0;
78			socklen_t len = sizeof(err);
79
80	michael	8826	assert(F);
81			assert(F->flags.open == true);
82
83			if (getsockopt(F->fd, SOL_SOCKET, SO_ERROR, &err, &len) == 0)
84	adx	30	{
85			if (err)
86			errtmp = err;
87			}
88	michael	8557
89	adx	30	errno = errtmp;
90			#endif
91			return errtmp;
92			}
93
94			/*
95	michael	2916	* report_error - report an error from an errno.
96	adx	30	* 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	michael	9250	* by the sockhost from the client, and the latter will
101	adx	30	* be taken from sys_errlist[errno].
102			*
103	michael	9250	* client if not NULL, is the LOCAL client associated with
104	adx	30	* 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	michael	2916	*
110	adx	30	* Actually stderr is still there IFF ircd was run with -s --Rodder
111			*/
112			void
113	michael	8431	report_error(int level, const char text, const char who, int error)
114	adx	30	{
115			who = (who) ? who : "";
116
117	michael	1618	sendto_realops_flags(UMODE_DEBUG, level, SEND_NOTICE,
118			text, who, strerror(error));
119	michael	1247	ilog(LOG_TYPE_IRCD, text, who, strerror(error));
120	adx	30	}
121
122			/*
123			* setup_socket()
124			*
125			* Set the socket non-blocking, and other wonderful bits.
126			*/
127	michael	2632	static void
128			setup_socket(int fd)
129	adx	30	{
130			int opt = 1;
131
132	michael	967	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
133	adx	30
134			#ifdef IPTOS_LOWDELAY
135			opt = IPTOS_LOWDELAY;
136	michael	967	setsockopt(fd, IPPROTO_IP, IP_TOS, &opt, sizeof(opt));
137	adx	30	#endif
138
139	michael	9054	#ifdef TCP_QUICKACK
140			opt = 1;
141			setsockopt(fd, SOL_SOCKET, TCP_QUICKACK, &opt, sizeof(opt));
142			#endif
143
144	adx	30	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	michael	8339	ssl_handshake(fde_t F, void data)
153	adx	30	{
154	michael	9250	struct Client *client = data;
155	adx	30
156	michael	9250	assert(client);
157			assert(client->connection);
158			assert(client->connection->fd);
159			assert(client->connection->fd == F);
160	michael	8339
161	michael	9157	tls_handshake_status_t ret = tls_handshake(&F->tls, TLS_ROLE_SERVER, NULL);
162	michael	7105	if (ret != TLS_HANDSHAKE_DONE)
163	michael	2463	{
164	michael	9250	if ((event_base->time.sec_monotonic - client->connection->created_monotonic) > TLS_HANDSHAKE_TIMEOUT)
165	michael	2725	{
166	michael	9250	exit_client(client, "Timeout during TLS handshake");
167	michael	2725	return;
168			}
169
170	michael	7105	switch (ret)
171	michael	2463	{
172	michael	7105	case TLS_HANDSHAKE_WANT_WRITE:
173	michael	9250	comm_setselect(F, COMM_SELECT_WRITE, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
174	michael	2463	return;
175	michael	7105	case TLS_HANDSHAKE_WANT_READ:
176	michael	9250	comm_setselect(F, COMM_SELECT_READ, ssl_handshake, client, TLS_HANDSHAKE_TIMEOUT);
177	michael	2463	return;
178			default:
179	michael	9250	exit_client(client, "Error during TLS handshake");
180	michael	2916	return;
181	michael	2463	}
182			}
183
184	michael	8339	comm_settimeout(F, 0, NULL, NULL);
185	michael	2733
186	michael	9408	if (tls_verify_certificate(&F->tls, ConfigServerInfo.message_digest_algorithm, &client->tls_certfp) == false)
187	michael	9213	ilog(LOG_TYPE_IRCD, "Client %s gave bad TLS client certificate",
188	michael	9250	client_get_name(client, MASK_IP));
189	michael	2228
190	michael	9250	auth_start(client);
191	adx	30	}
192
193			/*
194	michael	2916	* add_connection - creates a client which has just connected to us on
195	adx	30	* 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	michael	549	add_connection(struct Listener listener, struct irc_ssaddr irn, int fd)
202	adx	30	{
203	michael	9250	struct Client *client = client_make(NULL);
204	michael	549
205	michael	9590	client->connection->fd = fd_open(fd, true, listener_has_flag(listener, LISTENER_TLS) ?
206			"Incoming TLS connection" : "Incoming connection");
207	adx	30
208	michael	1123	/*
209	adx	30	* 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	michael	9250	client->ip = *irn;
213	adx	30
214	michael	9250	getnameinfo((const struct sockaddr *)&client->ip,
215			client->ip.ss_len, client->sockhost,
216			sizeof(client->sockhost), NULL, 0, NI_NUMERICHOST);
217	michael	1072
218	michael	9892	if (client->sockhost[0] == ':' &&
219			client->sockhost[1] == ':')
220	adx	30	{
221	michael	9892	memmove(client->sockhost + 1, client->sockhost, sizeof(client->sockhost) - 1);
222	michael	9250	client->sockhost[0] = '0';
223	michael	549	}
224	adx	30
225	michael	9250	strlcpy(client->host, client->sockhost, sizeof(client->host));
226	michael	8265
227	michael	9250	client->connection->listener = listener;
228	adx	30	++listener->ref_count;
229
230	michael	9590	if (listener_has_flag(listener, LISTENER_TLS))
231	adx	30	{
232	michael	9250	if (tls_new(&client->connection->fd->tls, fd, TLS_ROLE_SERVER) == false)
233	adx	30	{
234	michael	9250	SetDead(client);
235			exit_client(client, "TLS context initialization failed");
236	adx	30	return;
237			}
238
239	michael	9250	AddFlag(client, FLAGS_TLS);
240			ssl_handshake(client->connection->fd, client);
241	adx	30	}
242			else
243	michael	9250	auth_start(client);
244	adx	30	}
245
246			/*
247			* stolen from squid - its a neat (but overused! :) routine which we
248			* can use to see whether we can ignore this errno or not. It is
249			* generally useful for non-blocking network IO related errnos.
250			* -- adrian
251			*/
252	michael	8660	bool
253	michael	8414	comm_ignore_errno(int ierrno)
254	adx	30	{
255			switch (ierrno)
256			{
257			case EINPROGRESS:
258			case EWOULDBLOCK:
259			#if EAGAIN != EWOULDBLOCK
260			case EAGAIN:
261			#endif
262			case EALREADY:
263			case EINTR:
264			#ifdef ERESTART
265			case ERESTART:
266			#endif
267	michael	8660	return true;
268	adx	30	default:
269	michael	8660	return false;
270	adx	30	}
271			}
272
273			/*
274			* comm_settimeout() - set the socket timeout
275			*
276			* Set the timeout for the fd
277			*/
278			void
279	michael	8339	comm_settimeout(fde_t F, uintmax_t timeout, void (callback)(fde_t , void ), void *cbdata)
280	adx	30	{
281	michael	8717	assert(F);
282	michael	8658	assert(F->flags.open == true);
283	adx	30
284	michael	9438	F->timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
285	michael	8339	F->timeout_handler = callback;
286			F->timeout_data = cbdata;
287	adx	30	}
288
289			/*
290			* comm_setflush() - set a flush function
291			*
292			* A flush function is simply a function called if found during
293			* comm_timeouts(). Its basically a second timeout, except in this case
294			* I'm too lazy to implement multiple timeout functions! :-)
295			* its kinda nice to have it separate, since this is designed for
296			* flush functions, and when comm_close() is implemented correctly
297			* with close functions, we _actually_ don't call comm_close() here ..
298			* -- originally Adrian's notes
299	michael	2916	* comm_close() is replaced with fd_close() in fdlist.c
300	adx	30	*/
301			void
302	michael	8339	comm_setflush(fde_t F, uintmax_t timeout, void (callback)(fde_t , void ), void *cbdata)
303	adx	30	{
304	michael	8717	assert(F);
305	michael	8658	assert(F->flags.open == true);
306	adx	30
307	michael	9438	F->flush_timeout = timeout ? event_base->time.sec_monotonic + timeout : 0;
308	michael	8339	F->flush_handler = callback;
309			F->flush_data = cbdata;
310	adx	30	}
311
312			/*
313			* comm_checktimeouts() - check the socket timeouts
314			*
315			* All this routine does is call the given callback/cbdata, without closing
316			* down the file descriptor. When close handlers have been implemented,
317			* this will happen.
318			*/
319			void
320	michael	4439	comm_checktimeouts(void *unused)
321	adx	30	{
322	michael	8339	for (int fd = 0; fd <= highest_fd; ++fd)
323	michael	7431	{
324	michael	8339	fde_t *F = &fd_table[fd];
325	adx	30
326	michael	8658	if (F->flags.open == false)
327	michael	8339	continue;
328	adx	30
329	michael	8339	/* check flush functions */
330	michael	9440	if (F->flush_timeout && F->flush_timeout < event_base->time.sec_monotonic)
331	michael	8339	{
332	michael	9440	void (hdl)(fde_t , void *) = F->flush_handler;
333			void *data = F->flush_data;
334	michael	8349
335	michael	8339	comm_setflush(F, 0, NULL, NULL);
336			hdl(F, data);
337	adx	30	}
338	michael	8339
339			/* check timeouts */
340	michael	9440	if (F->timeout && F->timeout < event_base->time.sec_monotonic)
341	michael	8339	{
342			/* Call timeout handler */
343	michael	9440	void (hdl)(fde_t , void *) = F->timeout_handler;
344			void *data = F->timeout_data;
345	michael	8349
346	michael	8339	comm_settimeout(F, 0, NULL, NULL);
347			hdl(F, data);
348			}
349	michael	7431	}
350	adx	30	}
351
352			/*
353			* void comm_connect_tcp(int fd, const char *host, unsigned short port,
354			* struct sockaddr *clocal, int socklen,
355			* CNCB callback, void data, int aftype, int timeout)
356			* Input: An fd to connect with, a host and port to connect to,
357			* a local sockaddr to connect from + length(or NULL to use the
358			* default), a callback, the data to pass into the callback, the
359			* address family.
360			* Output: None.
361			* Side-effects: A non-blocking connection to the host is started, and
362			* if necessary, set up for selection. The callback given
363			* may be called now, or it may be called later.
364			*/
365			void
366	michael	8872	comm_connect_tcp(fde_t F, const struct irc_ssaddr caddr, unsigned short port, const struct irc_ssaddr *baddr,
367			void (callback)(fde_t , int, void ), void data, uintmax_t timeout)
368	adx	30	{
369	michael	8872	assert(callback);
370	adx	30
371	michael	9043	F->connect.hostaddr = *caddr;
372	michael	8872	/* The cast is hacky, but safe - port offset is same on v4 and v6 */
373			((struct sockaddr_in *)&F->connect.hostaddr)->sin_port = htons(port);
374	michael	8339	F->connect.callback = callback;
375			F->connect.data = data;
376	adx	30
377			/* Note that we're using a passed sockaddr here. This is because
378			* generally you'll be bind()ing to a sockaddr grabbed from
379			* getsockname(), so this makes things easier.
380			* XXX If NULL is passed as local, we should later on bind() to the
381			* virtual host IP, for completeness.
382			* -- adrian
383			*/
384	michael	8872	if (baddr && bind(F->fd, (const struct sockaddr *)baddr, baddr->ss_len) < 0)
385	michael	2916	{
386	adx	30	/* Failure, call the callback with COMM_ERR_BIND */
387	michael	8339	comm_connect_callback(F, COMM_ERR_BIND);
388	michael	6948	return; /* ... and quit */
389	adx	30	}
390
391	michael	8941	comm_settimeout(F, timeout, comm_connect_timeout, NULL);
392	michael	8872	comm_connect_tryconnect(F, NULL);
393	adx	30	}
394
395			/*
396			* comm_connect_callback() - call the callback, and continue with life
397			*/
398			static void
399	michael	8339	comm_connect_callback(fde_t *F, int status)
400	adx	30	{
401	michael	4464	void (hdl)(fde_t , int, void *);
402	adx	30
403			/* This check is gross..but probably necessary */
404	michael	8339	if (F->connect.callback == NULL)
405	adx	30	return;
406
407			/* Clear the connect flag + handler */
408	michael	8339	hdl = F->connect.callback;
409			F->connect.callback = NULL;
410	adx	30
411			/* Clear the timeout handler */
412	michael	8339	comm_settimeout(F, 0, NULL, NULL);
413	adx	30
414			/* Call the handler */
415	michael	8339	hdl(F, status, F->connect.data);
416	adx	30	}
417
418			/*
419			* comm_connect_timeout() - this gets called when the socket connection
420			* times out. This only can be called once connect() is initially
421			* called ..
422			*/
423			static void
424	michael	8339	comm_connect_timeout(fde_t F, void unused)
425	adx	30	{
426			/* error! */
427	michael	8339	comm_connect_callback(F, COMM_ERR_TIMEOUT);
428	adx	30	}
429
430	michael	8339	/* static void comm_connect_tryconnect(fde_t fd, void unused)
431	adx	30	* Input: The fd, the handler data(unused).
432			* Output: None.
433			* Side-effects: Try and connect with pending connect data for the FD. If
434			* we succeed or get a fatal error, call the callback.
435			* Otherwise, it is still blocking or something, so register
436			* to select for a write event on this FD.
437			*/
438			static void
439	michael	8339	comm_connect_tryconnect(fde_t F, void unused)
440	adx	30	{
441			/* This check is needed or re-entrant s_bsd_* like sigio break it. */
442	michael	8339	if (F->connect.callback == NULL)
443	adx	30	return;
444
445			/* Try the connect() */
446	michael	8339	int retval = connect(F->fd, (struct sockaddr *)&F->connect.hostaddr, F->connect.hostaddr.ss_len);
447	adx	30
448			/* Error? */
449			if (retval < 0)
450			{
451			/*
452			* If we get EISCONN, then we've already connect()ed the socket,
453			* which is a good thing.
454			* -- adrian
455			*/
456			if (errno == EISCONN)
457	michael	8339	comm_connect_callback(F, COMM_OK);
458	michael	8414	else if (comm_ignore_errno(errno))
459	adx	30	/* Ignore error? Reschedule */
460	michael	8339	comm_setselect(F, COMM_SELECT_WRITE, comm_connect_tryconnect, NULL, 0);
461	adx	30	else
462			/* Error? Fail with COMM_ERR_CONNECT */
463	michael	8339	comm_connect_callback(F, COMM_ERR_CONNECT);
464	adx	30	return;
465			}
466
467			/* If we get here, we've suceeded, so call with COMM_OK */
468	michael	8339	comm_connect_callback(F, COMM_OK);
469	adx	30	}
470
471			/*
472			* comm_errorstr() - return an error string for the given error condition
473			*/
474			const char *
475			comm_errstr(int error)
476			{
477			if (error < 0 \|\| error >= COMM_ERR_MAX)
478			return "Invalid error number!";
479			return comm_err_str[error];
480			}
481
482			/*
483			* comm_open() - open a socket
484			*
485			* This is a highly highly cut down version of squid's comm_open() which
486			* for the most part emulates socket(), EXCEPT it fails if we're about
487			* to run out of file descriptors.
488			*/
489			int
490	michael	8339	comm_socket(int family, int sock_type, int proto)
491	adx	30	{
492			/* First, make sure we aren't going to run out of file descriptors */
493			if (number_fd >= hard_fdlimit)
494			{
495			errno = ENFILE;
496			return -1;
497			}
498
499			/*
500			* Next, we try to open the socket. We should drop the reserved FD
501			* limit if/when we get an error, but we can deal with that later.
502			* XXX !!! -- adrian
503			*/
504	michael	7431	int fd = socket(family, sock_type, proto);
505	adx	30	if (fd < 0)
506			return -1; /* errno will be passed through, yay.. */
507
508	michael	2632	setup_socket(fd);
509	adx	30
510	michael	8339	return fd;
511	adx	30	}
512
513			/*
514			* comm_accept() - accept an incoming connection
515			*
516			* This is a simple wrapper for accept() which enforces FD limits like
517			* comm_open() does. Returned fd must be either closed or tagged with
518			* fd_open (this function no longer does it).
519			*/
520			int
521	michael	8826	comm_accept(fde_t F, struct irc_ssaddr addr)
522	adx	30	{
523			socklen_t addrlen = sizeof(struct irc_ssaddr);
524
525			if (number_fd >= hard_fdlimit)
526			{
527			errno = ENFILE;
528			return -1;
529			}
530
531	michael	8431	memset(addr, 0, sizeof(*addr));
532	michael	4407
533	adx	30	/*
534			* Next, do the accept(). if we get an error, we should drop the
535			* reserved fd limit, but we can deal with that when comm_open()
536			* also does it. XXX -- adrian
537			*/
538	michael	8826	int fd = accept(F->fd, (struct sockaddr *)addr, &addrlen);
539			if (fd < 0)
540	adx	30	return -1;
541
542	michael	4407	remove_ipv6_mapping(addr);
543	adx	30
544	michael	8826	setup_socket(fd);
545	adx	30
546			/* .. and return */
547	michael	8826	return fd;
548	adx	30	}
549
550	michael	2916	/*
551	adx	30	* remove_ipv6_mapping() - Removes IPv4-In-IPv6 mapping from an address
552	michael	1122	* OSes with IPv6 mapping listening on both
553	adx	30	* AF_INET and AF_INET6 map AF_INET connections inside AF_INET6 structures
554	michael	2916	*
555	adx	30	*/
556			void
557			remove_ipv6_mapping(struct irc_ssaddr *addr)
558			{
559			if (addr->ss.ss_family == AF_INET6)
560			{
561	michael	1122	if (IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)addr)->sin6_addr))
562			{
563	michael	2916	struct sockaddr_in6 v6;
564	michael	1122	struct sockaddr_in v4 = (struct sockaddr_in )addr;
565	adx	30
566	michael	1122	memcpy(&v6, addr, sizeof(v6));
567			memset(v4, 0, sizeof(struct sockaddr_in));
568			memcpy(&v4->sin_addr, &v6.sin6_addr.s6_addr[12], sizeof(v4->sin_addr));
569
570	adx	30	addr->ss.ss_family = AF_INET;
571			addr->ss_len = sizeof(struct sockaddr_in);
572			}
573	michael	2916	else
574	adx	30	addr->ss_len = sizeof(struct sockaddr_in6);
575			}
576			else
577			addr->ss_len = sizeof(struct sockaddr_in);
578	michael	2916	}