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/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2005 Nokia Corporation.
 *
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

/**@CFILE tport.c Transport interface implementation.
 *
 * See tport.docs for more detailed description of tport interface.
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 * @author Ismo Puustinen <Ismo.H.Puustinen@nokia.com>
 * @author Tat Chan <Tat.Chan@nokia.com>
 * @author Kai Vehmanen <kai.vehmanen@nokia.com>
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 * @author Martti Mela <Martti.Mela@nokia.com>
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 *
 * @date Created: Thu Jul 20 12:54:32 2000 ppessi
 */

#include "config.h"

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#include <sofia-sip/string0.h>
#include <sofia-sip/su.h>
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#include <sofia-sip/su_errno.h>
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#include <sofia-sip/su_alloc.h>
#include <sofia-sip/su_tagarg.h>
#include <sofia-sip/su_localinfo.h>
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typedef struct tport_nat_s tport_nat_t;

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#define SU_WAKEUP_ARG_T         struct tport_s
#define SU_TIMER_ARG_T          struct tport_master
#define SU_MSG_ARG_T            union tport_su_msg_arg
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#include <sofia-sip/su_wait.h>
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#include <sofia-sip/msg.h>
#include <sofia-sip/msg_addr.h>
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#include <sofia-sip/hostdomain.h>
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#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>
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#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP (132)
#endif

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#include "sofia-sip/tport.h"
#include "sofia-sip/su_uniqueid.h"
#include <sofia-sip/rbtree.h>
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#include "tport_internal.h"

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#if HAVE_FUNC
#elif HAVE_FUNCTION
#define __func__ __FUNCTION__
#else
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static char const __func__[] = "tport";
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#endif

#define STACK_RECV(tp, msg, now)		       \
  (tp)->tp_master->mr_tpac->tpac_recv((tp)->tp_master->mr_stack, (tp), \
				      (msg), (tp)->tp_magic, (now))

#define STACK_ERROR(tp, errcode, dstname) \
  (tp)->tp_master->mr_tpac->tpac_error((tp)->tp_master->mr_stack, (tp), \
				       (errcode), (dstname))

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#define STACK_ADDRESS(tp)		       \
  (tp)->tp_master->mr_tpac->tpac_address((tp)->tp_master->mr_stack, (tp))

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#define TP_STACK   tp_master->mr_stack

/* Define macros for rbtree implementation */
#define TP_LEFT(tp) ((tp)->tp_left)
#define TP_RIGHT(tp) ((tp)->tp_right)
#define TP_PARENT(tp) ((tp)->tp_dad)
#define TP_SET_RED(tp) ((tp)->tp_black = 0)
#define TP_SET_BLACK(tp) ((tp)->tp_black = 1)
#define TP_IS_RED(tp) ((tp) && (tp)->tp_black == 0)
#define TP_IS_BLACK(tp) (!(tp) || (tp)->tp_black == 1)
#define TP_COPY_COLOR(dst, src) ((dst)->tp_black = (src)->tp_black)
#define TP_INSERT(tp) ((void)0)
#define TP_REMOVE(tp) ((tp)->tp_left = (tp)->tp_right = (tp)->tp_dad = NULL)

static inline int tp_cmp(tport_t const *a, tport_t const *b)
{
  if (a == b)
    return 0;
  
  if (a->tp_addrlen != b->tp_addrlen)
    return a->tp_addrlen - b->tp_addrlen;

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  return memcmp(a->tp_addr, b->tp_addr, a->tp_addrlen);
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}

static inline int tprb_is_inserted(tport_t const *a)
{
  return a->tp_dad != 0 || a->tp_left != 0 || a->tp_right != 0;
}

RBTREE_PROTOS(static inline, tprb, tport_t);

RBTREE_BODIES(static inline, tprb, tport_t, 
	      TP_LEFT, TP_RIGHT, TP_PARENT,
	      TP_IS_RED, TP_SET_RED, TP_IS_BLACK, TP_SET_BLACK, TP_COPY_COLOR,
	      tp_cmp, TP_INSERT, TP_REMOVE);

enum {
  /** Default per-thread read queue length */
  THRP_PENDING = 8
};

struct tport_pending_s {
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  /* tport_pending_t       *p_left, *p_right, *p_parent; */
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  void               *p_client;
  tport_pending_error_f *p_callback;
  msg_t              *p_msg;
  int                 p_reported;
};

/** Return true if transport is master. */
inline int tport_is_master(tport_t const *self)
{
  return 
    self && 
    self->tp_master->mr_master == self;
}

/** Return true if transport is primary. */
inline int tport_is_primary(tport_t const *self)
{
  return 
    self && 
    self->tp_pri->pri_primary == self;
}

/** Return true if transport is secondary. */
inline int tport_is_secondary(tport_t const *self)
{
  return 
    self && 
    self->tp_master->mr_master != self && 
    self->tp_pri->pri_primary != self;
}

/** Test if transport has been registered */
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inline int tport_is_registered(tport_t const *self)
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{
  return self->tp_index != 0;
}

/** Test if transport is stream. */
inline int tport_is_stream(tport_t const *self)
{
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  return self->tp_addrinfo->ai_socktype == SOCK_STREAM;
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}
 
/** Test if transport is dgram. */
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inline int tport_is_dgram(tport_t const *self)
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{
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  return self->tp_addrinfo->ai_socktype == SOCK_DGRAM;
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}
 
/** Test if transport is udp. */
inline int tport_is_udp(tport_t const *self)
{
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  return self->tp_addrinfo->ai_protocol == IPPROTO_UDP;
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}
 
/** Test if transport is tcp. */
inline int tport_is_tcp(tport_t const *self)
{
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  return self->tp_addrinfo->ai_protocol == IPPROTO_TCP;
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}
 
/** Return 1 if transport is reliable, 0 otherwise.
 *
 * (Note that this is part of external API).
 */
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int tport_is_reliable(tport_t const *self)
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{
  return self != NULL && 
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    (self->tp_addrinfo->ai_socktype == SOCK_STREAM || 
     self->tp_addrinfo->ai_socktype == SOCK_SEQPACKET);
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}

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/** Return 0 if self is local, nonzero otherwise.
 *
 * The return valu is the 
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 *
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 * @sa TPTAG_PUBLIC(), enum #tport_via.
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 */
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int tport_is_public(tport_t const *self)
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{
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  return self->tp_pri->pri_public;
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}
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/** Return true if transport supports IPv4 */
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int tport_has_ip4(tport_t const *self)
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{
  return self && 
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    (self->tp_addrinfo->ai_family == 0 || 
     self->tp_addrinfo->ai_family == AF_INET);
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}

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#if SU_HAVE_IN6
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/** Return true if transport supports IPv6 */
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int tport_has_ip6(tport_t const *self)
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{
  return self && 
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    (self->tp_addrinfo->ai_family == 0 || 
     self->tp_addrinfo->ai_family == AF_INET6);
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}
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#endif
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/** Return true if transport supports TLS. */
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int tport_has_tls(tport_t const *self)
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{
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  return self && self->tp_pri->pri_has_tls;

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}

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/** Return true if transport is being updated. */
int tport_is_updating(tport_t const *self)
{
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  tport_primary_t *pri;

  if (tport_is_master(self)) {
    for (pri = self->tp_master->mr_primaries; pri; pri = pri->pri_next) 
      if (pri->pri_updating)
	return 1;
  }
  else if (tport_is_primary(self)) {
    return self->tp_pri->pri_updating;
  }

  return 0;
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}

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/** Test if transport has been closed */
static inline int tport_is_closed(tport_t const *self)
{
  return self->tp_closed;
}

/** Test if transport has been shut down */
static inline int tport_is_shutdown(tport_t const *self)
{
  return self->tp_closed || self->tp_send_close || self->tp_recv_close;
}

/** Test if transport is bound */
static inline int tport_is_bound(tport_t const *self)
{
  return self->tp_protoname != NULL;
}

/** MTU for transport  */
static inline unsigned tport_mtu(tport_t const *self)
{
  return self->tp_params->tpp_mtu;
}

static inline
int tport_has_sigcomp(tport_t const *self)
{
  return self->tp_name->tpn_comp != NULL;
}

static 
tport_t *tport_connect(tport_primary_t *pri, su_addrinfo_t *ai, 
		       tp_name_t const *tpn);

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static int bind6only_check(tport_master_t *mr);
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static
int tport_server_addrinfo(tport_master_t *mr,
			  char const *canon,
			  int family,
			  char const *host, 
			  char const *service,
			  char const *protocol,
			  char const * const transports[],
			  su_addrinfo_t **res);

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static int tport_get_local_addrinfo(tport_master_t *mr, 
				    char const *port,
				    su_addrinfo_t const *hints,
				    su_addrinfo_t **return_ai);

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int tport_getaddrinfo(char const *node, char const *service,
		      su_addrinfo_t const *hints,
		      su_addrinfo_t **res);

static void tport_freeaddrinfo(su_addrinfo_t *ai);
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static
int tport_addrinfo_copy(su_addrinfo_t *dst, void *addr, socklen_t addrlen,
			su_addrinfo_t const *src);

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static int
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  tport_bind_client(tport_master_t *self, tp_name_t const *tpn,
		    char const * const transports[], enum tport_via public,
		    tagi_t *tags),
  tport_bind_server(tport_master_t *, tp_name_t const *tpn,
		    char const * const transports[],  enum tport_via public,
		    tagi_t *tags),
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  tport_setname(tport_t *, char const *, su_addrinfo_t const *, char const *),
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  tport_wakeup_pri(su_root_magic_t *m, su_wait_t *w, tport_t *self),
  tport_wakeup(su_root_magic_t *m, su_wait_t *w, tport_t *self),
  tport_base_wakeup(tport_t *self, int events),
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  tport_connected(su_root_magic_t *m, su_wait_t *w, tport_t *self),
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  tport_resolve(tport_t *self, msg_t *msg, tp_name_t const *tpn),
  tport_vsend(tport_t *self, msg_t *msg, tp_name_t const *tpn,
	      msg_iovec_t iov[], int iovused,
	      struct sigcomp_compartment *cc),
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  tport_send_error(tport_t *, msg_t *, tp_name_t const *),
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  tport_queue(tport_t *self, msg_t *msg),
  tport_queue_rest(tport_t *self, msg_t *msg, msg_iovec_t iov[], int iovused),
  tport_pending_error(tport_t *self, su_sockaddr_t const *dst, int error),
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  tport_pending_errmsg(tport_t *self, msg_t *msg, int error);
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tport_t *tport_by_addrinfo(tport_primary_t const *pri,
			   su_addrinfo_t const *ai,
			   tp_name_t const *tpn);

void tport_peer_address(tport_t *self, msg_t *msg);
static unsigned long tport_now(void);

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static void tport_tick(su_root_magic_t *, su_timer_t *, tport_master_t *mr);
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static void tport_parse(tport_t *self, int complete, su_time_t now);
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static tport_primary_t *tport_alloc_primary(tport_master_t *mr,
					    tport_vtable_t const *vtable,
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					    tp_name_t tpn[1],
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					    su_addrinfo_t *ai, 
					    tagi_t const *tags,
					    char const **return_culprit);

static tport_primary_t *tport_listen(tport_master_t *mr,
				     tport_vtable_t const *vtable,
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				     tp_name_t tpn[1],
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				     su_addrinfo_t *ai,
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				     tagi_t *tags);
static void tport_zap_primary(tport_primary_t *);

static char *localipname(int pf, char *buf, int bufsiz);
static int getprotohints(su_addrinfo_t *hints,
			 char const *proto, int flags);
static void tport_send_queue(tport_t *self);


/* Stack class used when transports are being destroyed */
static
void tport_destroy_recv(tp_stack_t *stack, tport_t *tp, 
			msg_t *msg, tp_magic_t *magic, 
			su_time_t received)
{
  msg_destroy(msg);
}

static
void tport_destroy_error(tp_stack_t *stack, tport_t *tp, 
			 int errcode, char const *remote)
{
}

static
msg_t *tport_destroy_alloc(tp_stack_t *stack, int flags, 
			   char const data[], unsigned len,
			   tport_t const *tp,
			   tp_client_t *tpc)
{
  return NULL;
}

/** Name for "any" transport. @internal */
static char const tpn_any[] = "*";

/** Create the master transport. */
tport_t *tport_tcreate(tp_stack_t *stack,
		       tp_stack_class_t const *tpac,
		       su_root_t *root, 
		       tag_type_t tag, tag_value_t value, ...)
{
  tport_master_t *mr;
  tp_name_t *tpn;
  tport_params_t *tpp;
  unsigned tick;
  ta_list ta;

  if (!stack || !tpac || !root) {
    su_seterrno(EINVAL);
    return NULL;
  }

  mr = su_home_clone(NULL, sizeof *mr);
  if (!mr)
    return NULL;

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  SU_DEBUG_7(("%s(): %p\n", "tport_create", mr));
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  mr->mr_stack = stack;
  mr->mr_tpac = tpac;
  mr->mr_root = root;

  mr->mr_master->tp_master = mr;
  mr->mr_master->tp_params = tpp = mr->mr_params;

  mr->mr_master->tp_reusable = 1;
  tpp->tpp_mtu = UINT_MAX;
  tpp->tpp_thrprqsize = THRP_PENDING;
  tpp->tpp_qsize = TPORT_QUEUESIZE;
  tpp->tpp_sdwn_error = 1;
  tpp->tpp_idle = UINT_MAX;
  tpp->tpp_timeout = UINT_MAX;
  tpp->tpp_sigcomp_lifetime = UINT_MAX;
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  tpp->tpp_stun_server = 1;
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  tpn = mr->mr_master->tp_name;
  tpn->tpn_proto = "*";
  tpn->tpn_host = "*";
  tpn->tpn_canon = "*";
  tpn->tpn_port = "*";

  ta_start(ta, tag, value);

  tport_set_params(mr->mr_master, ta_tags(ta));
  tport_open_log(mr, ta_args(ta));

  tick = 5000; /* For testing, usually 30000 is enough */  
  if (tpp->tpp_idle < 4 * tick)
    tick = tpp->tpp_idle / 4;
  if (tpp->tpp_timeout < 4 * tick)
    tick = tpp->tpp_timeout / 4;
  if (tick < 200)
    tick = 200;

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  tport_init_stun_server(mr, ta_args(ta));

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  mr->mr_timer = su_timer_create(su_root_task(root), tick);
  su_timer_set(mr->mr_timer, tport_tick, mr);

  ta_end(ta);

  return mr->mr_master;
}

/** Destroy the master transport. */
void tport_destroy(tport_t *self)
{
  tport_master_t *mr;

  static tp_stack_class_t tport_destroy_tpac[1] = 
    {{
	sizeof tport_destroy_tpac,
	/* tpac_recv */ tport_destroy_recv,
	/* tpac_error */ tport_destroy_error,
	/* tpac_alloc */ tport_destroy_alloc,
      }};

  SU_DEBUG_7(("%s(%p)\n", __func__, self));

  if (self == NULL)
    return;
  
  assert(tport_is_master(self));
  if (!tport_is_master(self))
    return;

  mr = (tport_master_t *)self;
  mr->mr_tpac = tport_destroy_tpac;

  while (mr->mr_primaries)
    tport_zap_primary(mr->mr_primaries);

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  tport_deinit_stun_server(mr);
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  if (mr->mr_dump_file)
    fclose(mr->mr_dump_file), mr->mr_dump_file = NULL;

  if (mr->mr_timer)
    su_timer_destroy(mr->mr_timer), mr->mr_timer = NULL;

  su_home_zap(mr->mr_home);
}

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/** Allocate a primary transport */
static 
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tport_primary_t *tport_alloc_primary(tport_master_t *mr,
				     tport_vtable_t const *vtable,
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				     tp_name_t tpn[1],
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				     su_addrinfo_t *ai,
				     tagi_t const *tags,
				     char const **return_culprit)
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{
  tport_primary_t *pri, **next;
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  tport_t *tp;
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  for (next = &mr->mr_primaries; *next; next = &(*next)->pri_next)
    ;
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  assert(vtable->vtp_pri_size >= sizeof *pri);
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  if ((pri = su_home_clone(mr->mr_home, vtable->vtp_pri_size))) {
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    tport_t *tp = pri->pri_primary;
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    pri->pri_vtable = vtable;
    pri->pri_public = vtable->vtp_public;

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    tp->tp_master = mr;
    tp->tp_pri = pri;
    tp->tp_socket = SOCKET_ERROR;

    tp->tp_magic = mr->mr_master->tp_magic;

    tp->tp_params = pri->pri_params;
    memcpy(tp->tp_params, mr->mr_params, sizeof (*tp->tp_params));
    tp->tp_reusable = mr->mr_master->tp_reusable;

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    if (!pri->pri_public)
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      tp->tp_addrinfo->ai_addr = &tp->tp_addr->su_sa;
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    SU_DEBUG_5(("%s(%p): new primary tport %p\n", __func__, mr, pri));
  }

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  *next = pri; 
  tp = pri->pri_primary;
  
  if (!tp)
    *return_culprit = "alloc";
  else if (tport_set_params(tp, TAG_NEXT(tags)) < 0)
    *return_culprit = "tport_set_params";
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  else if (vtable->vtp_init_primary &&
	   vtable->vtp_init_primary(pri, tpn, ai, tags, return_culprit) < 0)
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    ;
  else if (tport_setname(tp, vtable->vtp_name, ai, tpn->tpn_canon) == -1) 
    *return_culprit = "tport_setname";
  else if (tpn->tpn_ident && 
	   !(tp->tp_name->tpn_ident = su_strdup(tp->tp_home, tpn->tpn_ident)))
    *return_culprit = "alloc ident";
  else
    return pri;			/* Success */
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  tport_zap_primary(pri);
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  return NULL;
}
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/** Destroy a primary transport and its secondary transports. @internal */
static 
void tport_zap_primary(tport_primary_t *pri)
{
  tport_primary_t **prip;

  if (pri == NULL)
    return;

  assert(tport_is_primary(pri->pri_primary));

  if (pri->pri_vtable->vtp_deinit_primary)
    pri->pri_vtable->vtp_deinit_primary(pri);

  while (pri->pri_secondary)
    tport_zap_secondary(pri->pri_secondary);

  /* We have just a single-linked list for primary transports */
  for (prip = &pri->pri_master->mr_primaries;
       *prip != pri;
       prip = &(*prip)->pri_next)
    assert(*prip);

  *prip = pri->pri_next;

  tport_zap_secondary(pri->pri_primary);
}
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/**Create a primary transport object with socket.
 *
 * Creates a primary transport object with a server socket, and then
 * registers the socket with suitable events to the root.
 *
 * @param dad   parent (master or primary) transport object
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 * @param ai    pointer to addrinfo structure
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 * @param canon canonical name of node
 * @param protoname name of the protocol
 */
static
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tport_primary_t *tport_listen(tport_master_t *mr,
			      tport_vtable_t const *vtable,
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			      tp_name_t tpn[1],
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			      su_addrinfo_t *ai, 
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			      tagi_t *tags)
{
  tport_primary_t *pri = NULL;

  int err;
  int errlevel = 3;
  char buf[TPORT_HOSTPORTSIZE];

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  char const *protoname = vtable->vtp_name;
  char const *culprit = "unknown";

  su_sockaddr_t *su = (void *)ai->ai_addr;

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  /* Log an error, return error */
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#define TPORT_LISTEN_ERROR(errno, what)				     \
  ((void)(err = errno,						     \
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	  ((err == EADDRINUSE || err == EAFNOSUPPORT ||		     \
	    err == ESOCKTNOSUPPORT || err == EPROTONOSUPPORT ||	     \
	    err == ENOPROTOOPT ? 7 : 3) < SU_LOG_LEVEL ?	     \
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	     su_llog(tport_log, errlevel,			     \
		     "%s(%p): %s(pf=%d %s/%s): %s\n",		     \
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		     __func__, mr, what, ai->ai_family,		     \
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		     protoname,					     \
		     tport_hostport(buf, sizeof(buf), su, 2),	     \
		     su_strerror(err)) : (void)0),		     \
	    tport_zap_primary(pri),		                     \
	    su_seterrno(err)),					     \
     (void *)NULL)

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  /* Create a primary transport object for another transport. */
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  pri = tport_alloc_primary(mr, vtable, tpn, ai, tags, &culprit);
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  if (pri == NULL)
    return TPORT_LISTEN_ERROR(errno, culprit);
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  if (pri->pri_primary->tp_socket != SOCKET_ERROR) {
    int index = 0;
    tport_t *tp = pri->pri_primary;
    su_wait_t wait[1] = { SU_WAIT_INIT };

    if (su_wait_create(wait, tp->tp_socket, tp->tp_events) == -1)
      return TPORT_LISTEN_ERROR(su_errno(), "su_wait_create");

    /* Register receiving or accepting function with events specified above */
    index = su_root_register(mr->mr_root, wait, tport_wakeup_pri, tp, 0); 
    if (index == -1) {
      su_wait_destroy(wait);
      return TPORT_LISTEN_ERROR(su_errno(), "su_root_register");
    }
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    tp->tp_index = index;
  }
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  pri->pri_primary->tp_connected = 0;
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  SU_DEBUG_5(("%s(%p): %s " TPN_FORMAT "\n", 
	      __func__, pri, "listening at",
	      TPN_ARGS(pri->pri_primary->tp_name)));

  return pri;
}

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int tport_bind_socket(int socket,
		      su_addrinfo_t *ai,
		      char const **return_culprit)
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{
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  su_sockaddr_t *su = (su_sockaddr_t *)ai->ai_addr;
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  if (bind(socket, ai->ai_addr, ai->ai_addrlen) == -1) {
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    return *return_culprit = "bind", -1;
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  }
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  if (getsockname(socket, ai->ai_addr, &ai->ai_addrlen) == SOCKET_ERROR) {
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    return *return_culprit = "getsockname", -1;
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  }
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#if defined (__linux__) && defined (SU_HAVE_IN6)
  if (ai->ai_family == AF_INET6) {
    if (!SU_SOCKADDR_INADDR_ANY(su) &&
	(IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr) ||
	 IN6_IS_ADDR_V4COMPAT(&su->su_sin6.sin6_addr))) {
      su_sockaddr_t su0[1];
      
      memcpy(su0, su, sizeof su0);
      
      memset(su, 0, ai->ai_addrlen = sizeof su->su_sin);
      su->su_family = ai->ai_family = AF_INET;
      su->su_port = su0->su_port;
      
#ifndef IN6_V4MAPPED_TO_INADDR
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#define IN6_V4MAPPED_TO_INADDR(in6, in4) \
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      memcpy((in4), 12 + (uint8_t *)(in6), sizeof(struct in_addr))
#endif
      IN6_V4MAPPED_TO_INADDR(&su0->su_sin6.sin6_addr, &su->su_sin.sin_addr);
    }
  }
#endif

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  return 0;
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}

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/** Indicate stack that a transport has been updated */
void tport_has_been_updated(tport_t *self)
{
  self->tp_pri->pri_updating = 0;

  if (self->tp_master->mr_tpac->tpac_address)
    self->tp_master->mr_tpac->tpac_address(self->tp_master->mr_stack, self);
}


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static
int tport_set_events(tport_t *self, int set, int clear)
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{
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  int events;
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  if (self == NULL)
    return -1;
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  events = (self->tp_events | set) & ~clear;
  self->tp_events = events;
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  if (self->tp_pri->pri_vtable->vtp_set_events)
    return self->tp_pri->pri_vtable->vtp_set_events(self);
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  SU_DEBUG_7(("tport_set_events(%p): events%s%s%s\n", self,
	      (events & SU_WAIT_IN) ? " IN" : "",
	      (events & SU_WAIT_OUT) ? " OUT" : "",
	      SU_WAIT_CONNECT != SU_WAIT_OUT &&
	      (events & SU_WAIT_CONNECT) ? " CONNECT" : ""));
  
  return 
    su_root_eventmask(self->tp_master->mr_root, 
		      self->tp_index, 
		      self->tp_socket, 
		      self->tp_events = events);
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}

/**Allocate a secondary transport. @internal
 *
 * The function tport_alloc_secondary() creates a secondary transport
 * object. The new transport initally shares parameters structure with the
 * original transport.
 *
 * @param dad primary transport
 *
 * @return
 * The function tport_alloc_seconary() returns a pointer to the newly
 * created transport, or NULL upon an error.
 */
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tport_t *tport_alloc_secondary(tport_primary_t *pri, int socket, int accepted)
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{
  tport_master_t *mr = pri->pri_master;
  tport_t *self;

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  self = su_home_clone(mr->mr_home, pri->pri_vtable->vtp_secondary_size);
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  if (self) {
    SU_DEBUG_7(("%s(%p): new secondary tport %p\n", __func__, pri, self));

    self->tp_refs = -1;			/* Freshly allocated  */
    self->tp_master = mr;
    self->tp_pri = pri;
    self->tp_params = pri->pri_params;
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    self->tp_accepted = accepted != 0;
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    self->tp_reusable = pri->pri_primary->tp_reusable;

    self->tp_magic = pri->pri_primary->tp_magic;
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    self->tp_addrinfo->ai_addr = (void *)self->tp_addr;
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    self->tp_socket = socket;
    
    if (pri->pri_vtable->vtp_init_secondary &&
	pri->pri_vtable->vtp_init_secondary(self, socket, accepted) < 0) {
      if (pri->pri_vtable->vtp_deinit_secondary)
	pri->pri_vtable->vtp_deinit_secondary(self);
      su_home_zap(self->tp_home);
      return NULL;
    }
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  }

  return self;
}

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/** Create a connected transport object with socket.
 *
 * The function tport_connect() creates a secondary transport with a
 * connected socket. It registers the socket with suitable events to the
 * root.
 *
 * @param pri   primary transport object
 * @param ai    pointer to addrinfo structure
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 * @param tpn   canonical name of node
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 */
static
tport_t *tport_connect(tport_primary_t *pri, 
		       su_addrinfo_t *ai,
		       tp_name_t const *tpn)
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{
  if (pri->pri_vtable->vtp_connect)
    return pri->pri_vtable->vtp_connect(pri, ai, tpn);
  else
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    return tport_base_connect(pri, ai, ai, tpn);
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}

/**Create a connected transport object with socket.
 *
 * The function tport_connect() creates a secondary transport with a
 * connected socket. It registers the socket with suitable events to the
 * root.
 *
 * @param pri   primary transport object
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 * @param ai    pointer to addrinfo structure describing socket
 * @param real_ai  pointer to addrinfo structure describing real target
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 * @param tpn   canonical name of node
 */
tport_t *tport_base_connect(tport_primary_t *pri, 
			    su_addrinfo_t *ai,
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			    su_addrinfo_t *real_ai,
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			    tp_name_t const *tpn)
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{
  tport_master_t *mr = pri->pri_master;
  tport_t *self = NULL;

  su_socket_t s = SOCKET_ERROR;
  int index = 0, err;
  su_wait_t wait[1] = { SU_WAIT_INIT };
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  su_wakeup_f wakeup = tport_wakeup;
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  int events = SU_WAIT_IN | SU_WAIT_ERR;
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  int errlevel = 3;
  char buf[TPORT_HOSTPORTSIZE];

  if (ai == NULL || ai->ai_addrlen > sizeof (self->tp_addr))
    return NULL;
  
  /* Log an error, return error */
#define TPORT_CONNECT_ERROR(errno, what)  \
  return							     \
    ((void)(err = errno, s != SOCKET_ERROR ? su_close(s) : 0,	     \
	    su_wait_destroy(wait),				     \
	    (SU_LOG_LEVEL >= errlevel ?				     \
	     su_llog(tport_log, errlevel,			     \
		     "%s(%p): %s(pf=%d %s/%s): %s\n",		     \
		     __func__, pri, #what, ai->ai_family,	     \
		     tpn->tpn_proto,				     \
		       tport_hostport(buf, sizeof(buf),		     \
				      (void *)ai->ai_addr, 2),	     \
		     su_strerror(err)) : (void)0),		     \
	    tport_zap_secondary(self),				     \
	    su_seterrno(err)),					     \
     (void *)NULL)

  s = su_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);

  if (pri->pri_primary->tp_socket != SOCKET_ERROR) {
    su_sockaddr_t susa;
    socklen_t susalen = sizeof(susa);
    int pri_s = pri->pri_primary->tp_socket;

    if (getsockname(pri_s, &susa.su_sa, &susalen) < 0) {
      SU_DEBUG_3(("tport_connect: getsockname(): %s\n", 
		  su_strerror(su_errno())));
    }
    else {
      susa.su_port = 0;
      if (bind(s, &susa.su_sa, susalen) < 0) {
	SU_DEBUG_3(("tport_connect: bind(local-ip): %s\n", 
		    su_strerror(su_errno())));
      }
    }
  }

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#if SU_HAVE_IN6
  if (s == SOCKET_ERROR) {
    if (ai->ai_family == AF_INET6 && su_errno() == EAFNOSUPPORT)
      errlevel = 7;
    TPORT_CONNECT_ERROR(su_errno(), socket);
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  }
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#endif
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  if (connect(s, ai->ai_addr, ai->ai_addrlen) == SOCKET_ERROR) {
    err = su_errno();
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    if (err != EINPROGRESS && err != EAGAIN && err != EWOULDBLOCK)
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      TPORT_CONNECT_ERROR(err, connect);
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    events = SU_WAIT_CONNECT | SU_WAIT_ERR;
    wakeup = tport_connected;
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  }

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  if (su_wait_create(wait, s, events) == -1)
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    TPORT_CONNECT_ERROR(su_errno(), su_wait_create);

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  if ((self = tport_alloc_secondary(pri, s, 0)) == NULL)
    TPORT_CONNECT_ERROR(errno, tport_alloc_secondary);

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  /* Register receiving function with events specified above */
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  if ((index = su_root_register(mr->mr_root, wait, wakeup, self, 0)) == -1)
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    TPORT_CONNECT_ERROR(su_errno(), su_root_register);

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  /* Set sockname for the tport */
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  if (tport_setname(self, tpn->tpn_proto, real_ai, tpn->tpn_canon) == -1) 
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    TPORT_CONNECT_ERROR(su_errno(), tport_setname);

  self->tp_socket   = s;
  self->tp_index    = index;
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  self->tp_events   = events;
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  self->tp_conn_orient = 1;

  SU_DEBUG_5(("%s(%p): %s " TPN_FORMAT "\n", 
	      __func__, self, "connecting to",
	      TPN_ARGS(self->tp_name)));

  tprb_append(&pri->pri_secondary, self);

  return self;
}

/** Destroy a secondary transport. @internal */
void tport_zap_secondary(tport_t *self)
{
  tport_master_t *mr;

  if (self == NULL)
    return;

  /* Remove from rbtree */
  tprb_remove(&self->tp_pri->pri_secondary, self);

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  /* Do not deinit primary as secondary! */
  if (tport_is_secondary(self) &&
      self->tp_pri->pri_vtable->vtp_deinit_secondary)
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    self->tp_pri->pri_vtable->vtp_deinit_secondary(self);

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  if (self->tp_msg) {
    msg_destroy(self->tp_msg), self->tp_msg = NULL;
    SU_DEBUG_3(("%s(%p): zapped partially received message\n", 
		__func__, self));
  }

  if (self->tp_queue && self->tp_queue[self->tp_qhead]) {
    size_t n = 0, i, N = self->tp_params->tpp_qsize;
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    for (i = self->tp_qhead; self->tp_queue[i]; i = (i + 1) % N) {
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      msg_destroy(self->tp_queue[i]), self->tp_queue[i] = NULL;
      n++;
    }
    SU_DEBUG_3(("%s(%p): zapped %lu queued messages\n", 
		__func__, self, (LU)n));
  }

  if (self->tp_pused) {
    SU_DEBUG_3(("%s(%p): zapped with pending requests\n", __func__, self));
  }

  mr = self->tp_master;

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  tport_stun_server_remove_socket(self);

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  if (self->tp_index)
    su_root_deregister(mr->mr_root, self->tp_index);
  self->tp_index = 0;
  if (self->tp_socket != -1)
    su_close(self->tp_socket);
  self->tp_socket = -1;

  su_home_zap(self->tp_home);
}

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/** Create a new reference to a transport object. */
tport_t *tport_ref(tport_t *tp)
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{
  if (tp) {
    if (tp->tp_refs >= 0)
      tp->tp_refs++;
    else if (tp->tp_refs == -1)
      tp->tp_refs = 1;
  }
  return tp;
}

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/** Destroy reference to a transport object. */
void tport_unref(tport_t *tp)
{
  if (tp && tp->tp_refs > 0)
    if (--tp->tp_refs == 0 && tp->tp_params->tpp_idle == 0)
      if (!tport_is_closed(tp))
	tport_close(tp);
}

/** Create a new reference to transport object. */
tport_t *tport_incref(tport_t *tp)
{
  return tport_ref(tp);
}

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/** Destroy a transport reference. */
void tport_decref(tport_t **ttp)
{
  assert(ttp);

  if (*ttp) {
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    tport_unref(*ttp);
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    *ttp = NULL;
  }
}

/** Get transport parameters.
 *
 * @param self          pointer to a transport object
 * @param tag,value,... list of tags
 */
int tport_get_params(tport_t const *self,
		     tag_type_t tag, tag_value_t value, ...)
{
  ta_list ta;
  int n;
  tport_params_t const *tpp;
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  tport_primary_t const *pri = self->tp_pri;
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  if (self == NULL)
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    return su_seterrno(EINVAL);
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  tpp = self->tp_params;
  ta_start(ta, tag, value);

  n = tl_tgets(ta_args(ta),
	       TPTAG_MTU(tpp->tpp_mtu),
	       TPTAG_REUSE(self->tp_reusable),
	       TPTAG_CONNECT(tpp->tpp_conn_orient),
	       TPTAG_QUEUESIZE(tpp->tpp_qsize),
	       TPTAG_IDLE(tpp->tpp_idle),
	       TPTAG_TIMEOUT(tpp->tpp_timeout),
	       TPTAG_SDWN_ERROR(tpp->tpp_sdwn_error),
	       TPTAG_DEBUG_DROP(tpp->tpp_drop),
	       TPTAG_THRPSIZE(tpp->tpp_thrpsize),
	       TPTAG_THRPRQSIZE(tpp->tpp_thrprqsize),
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	       TAG_IF(pri, TPTAG_PUBLIC(pri ? pri->pri_public : 0)),
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	       TAG_END());

  ta_end(ta);

  return n;
}

/** Set transport parameters.
 *
 * @param self          pointer to a transport object
 * @param tag,value,... list of tags
 */
int tport_set_params(tport_t *self,
		     tag_type_t tag, tag_value_t value, ...)
{
  ta_list ta;
  int n;
  tport_params_t tpp[1], *tpp0;

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  int connect, sdwn_error, reusable, stun_server;
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  struct sigcomp_compartment *cc = NONE;

  if (self == NULL)
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    return su_seterrno(EINVAL);
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  memcpy(tpp, tpp0 = self->tp_params, sizeof *tpp);

  connect = tpp->tpp_conn_orient;
  sdwn_error = tpp->tpp_sdwn_error;
  reusable = self->tp_reusable;
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  stun_server = tpp->tpp_stun_server;
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  ta_start(ta, tag, value);

  n = tl_gets(ta_args(ta),
	      TPTAG_MTU_REF(tpp->tpp_mtu),
	      TAG_IF(!self->tp_queue, TPTAG_QUEUESIZE_REF(tpp->tpp_qsize)),
	      TPTAG_IDLE_REF(tpp->tpp_idle),
	      TPTAG_TIMEOUT_REF(tpp->tpp_timeout),
	      TPTAG_DEBUG_DROP_REF(tpp->tpp_drop),
	      TPTAG_THRPSIZE_REF(tpp->tpp_thrpsize),
	      TPTAG_THRPRQSIZE_REF(tpp->tpp_thrprqsize),
	      TPTAG_SIGCOMP_LIFETIME_REF(tpp->tpp_sigcomp_lifetime),
	      TPTAG_CONNECT_REF(connect),
	      TPTAG_SDWN_ERROR_REF(sdwn_error),
	      TPTAG_REUSE_REF(reusable),
	      TPTAG_COMPARTMENT_REF(cc),
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	      TPTAG_STUN_SERVER_REF(stun_server),
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	      TAG_END());

  ta_end(ta);

  if (n == 0)
    return 0;

  if (tpp->tpp_idle > 0 && tpp->tpp_idle < 2000)
    tpp->tpp_idle = 2000;
  if (tpp->tpp_timeout < 1000)
    tpp->tpp_timeout = 1000;
  if (tpp->tpp_drop > 1000)
    tpp->tpp_drop = 1000;
  if (tpp->tpp_thrprqsize > 0)
    tpp->tpp_thrprqsize = tpp0->tpp_thrprqsize;
  if (tpp->tpp_sigcomp_lifetime != 0 && tpp->tpp_sigcomp_lifetime < 30)
    tpp->tpp_sigcomp_lifetime = 30;
  if (tpp->tpp_qsize >= 1000)
    tpp->tpp_qsize = 1000;

  /* Currently only primary UDP transport can *not* be connection oriented */ 
  tpp->tpp_conn_orient = connect 
    || !tport_is_primary(self) || !tport_is_dgram(self);
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  tpp->tpp_sdwn_error = sdwn_error;
  self->tp_reusable = reusable;
  tpp->tpp_stun_server = stun_server;
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  if (tport_is_secondary(self) && 
      self->tp_params == self->tp_pri->pri_primary->tp_params) {
    tpp0 = su_zalloc(self->tp_home, sizeof *tpp0); if (!tpp0) return -1;
  }

  memcpy(tpp0, tpp, sizeof *tpp);

  return n;
}

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extern tport_vtable_t const tport_udp_vtable;
extern tport_vtable_t const tport_tcp_vtable;
extern tport_vtable_t const tport_tls_vtable;
extern tport_vtable_t const tport_sctp_vtable;
extern tport_vtable_t const tport_udp_client_vtable;
extern tport_vtable_t const tport_tcp_client_vtable;
extern tport_vtable_t const tport_sctp_client_vtable;
extern tport_vtable_t const tport_tls_client_vtable;
extern tport_vtable_t const tport_http_connect_vtable;
extern tport_vtable_t const tport_threadpool_vtable;
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#define TPORT_NUMBER_OF_TYPES 64

tport_vtable_t const *tport_vtables[TPORT_NUMBER_OF_TYPES + 1] =
{
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  &tport_http_connect_vtable,
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#if HAVE_TLS
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  &tport_tls_client_vtable,
  &tport_tls_vtable,
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#endif
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#if HAVE_SCTP		/* SCTP is broken */
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  &tport_sctp_client_vtable,
  &tport_sctp_vtable,
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#endif
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  &tport_tcp_client_vtable,
  &tport_tcp_vtable,
  &tport_udp_client_vtable,
  &tport_udp_vtable,
  &tport_threadpool_vtable,
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#if HAVE_SOFIA_STUN
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  &tport_stun_vtable,
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#endif
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};

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/** Register new transport vtable */
int tport_register_type(tport_vtable_t const *vtp)
{
  int i;

  for (i = TPORT_NUMBER_OF_TYPES; i >= 0; i--) {
    if (tport_vtables[i] == NULL) {
      tport_vtables[i] = vtp;
      return 0;
    }
  }

  su_seterrno(ENOMEM);
  return -1;
}

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/**Get a vtable for given protocol */
tport_vtable_t const *tport_vtable_by_name(char const *protoname,
					   enum tport_via public) 
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{
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  int i;

  for (i = TPORT_NUMBER_OF_TYPES; i >= 0; i--) {
    tport_vtable_t const *vtable = tport_vtables[i];
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    if (vtable == NULL)
      continue;
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    if (vtable->vtp_public != public)
      continue;
    if (strcasecmp(vtable->vtp_name, protoname))
      continue;
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    assert(vtable->vtp_pri_size >= sizeof (tport_primary_t));
    assert(vtable->vtp_secondary_size >= sizeof (tport_t));
    
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    return vtable;
  }

  return NULL;
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}

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#if 0
tport_set_f const *tport_set_methods[TPORT_NUMBER_OF_TYPES + 1] = 
  {
    tport_server_bind_set,
    tport_client_bind_set,
    tport_threadpool_set,
    tport_http_connect_set,
#if HAVE_TLS
    tport_tls_set,
#endif
    NULL
  };
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int tport_bind_set(tport_master_t *mr, 
		   tp_name_t const *tpn,
		   char const * const transports[],
		   tagi_t const *taglist,
		   tport_set_t **return_set,
		   int set_size)
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{
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  int i;

  for (i = TPORT_NUMBER_OF_TYPES; i >= 0; i--) {
    tport_set_f const *perhaps = tport_vtables[i];
    int result;

    if (perhaps == NULL)
      continue;

    result = perhaps(mr, tpn, transports, taglist, return_set, set_size);
    if (result != 0)
      return result;
  }

  return 0;
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}
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#endif
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/** Bind transport objects.
 *
 * @param self        pointer to a transport object
 * @param tpn         desired transport address
 * @param transports  list of protocol names supported by stack
 * @param tag,value,... tagged argument list
 */
int tport_tbind(tport_t *self,
		tp_name_t const *tpn,
		char const * const transports[],
		tag_type_t tag, tag_value_t value, ...)
{
  ta_list ta;
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  int server = 1, retval, public = 0;
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  tp_name_t mytpn[1];
  tport_master_t *mr;
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  char const *http_connect = NULL;
  
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  if (self == NULL || tport_is_secondary(self) ||
      tpn == NULL || transports == NULL) {
    su_seterrno(EINVAL);
    return -1;
  }

  *mytpn = *tpn;

  if (mytpn->tpn_ident == NULL)
    mytpn->tpn_ident = self->tp_ident;

  ta_start(ta, tag, value);

  tl_gets(ta_args(ta),
	  TPTAG_SERVER_REF(server),
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	  TPTAG_PUBLIC_REF(public),
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	  TPTAG_IDENT_REF(mytpn->tpn_ident),
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	  TPTAG_HTTP_CONNECT_REF(http_connect),
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	  TAG_END());

  mr = self->tp_master; assert(mr);
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  if (http_connect && public == 0)
    public = tport_type_connect;
    
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  if (public && public != tport_type_stun)
    server = 0;

  if (server)
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    retval = tport_bind_server(mr, mytpn, transports, public, ta_args(ta));
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  else
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    retval = tport_bind_client(mr, mytpn, transports, public, ta_args(ta));
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  ta_end(ta);

  return retval;
}

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/** Bind primary transport objects used by a client-only application.
 * @internal
 */
int tport_bind_client(tport_master_t *mr,
                      tp_name_t const *tpn,
                      char const * const transports[],
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		      enum tport_via public,
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		      tagi_t *tags)
{
  int i;
  tport_primary_t *pri = NULL, **tbf;
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  tp_name_t tpn0[1] = {{ "*", "*", "*", "*", NULL, NULL }};
  char const *why = "unknown";

  tport_vtable_t const *vtable;
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  if (public == tport_type_local)
    public = tport_type_client;

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  SU_DEBUG_5(("%s(%p) to " TPN_FORMAT "\n", __func__, mr, TPN_ARGS(tpn)));

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  memset(tpn0, 0, sizeof(tpn0));

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  for (tbf = &mr->mr_primaries; *tbf; tbf = &(*tbf)->pri_next)
    ;

  for (i = 0; transports[i]; i++) {
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    su_addrinfo_t hints[1];
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    char const *proto = transports[i];
    
    if (strcmp(proto, tpn->tpn_proto) != 0 && 
        strcmp(tpn->tpn_proto, tpn_any) != 0)
      continue;

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    vtable = tport_vtable_by_name(proto, public);
    if (!vtable)
      continue;

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    /* Resolve protocol, skip unknown transport protocols */
    if (getprotohints(hints, proto, AI_PASSIVE) < 0)
      continue;

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    tpn0->tpn_proto = proto;
    tpn0->tpn_comp = tpn->tpn_comp;
    tpn0->tpn_ident = tpn->tpn_ident;
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    hints->ai_canonname = "*";
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    if (!(pri = tport_alloc_primary(mr, vtable, tpn0, hints, tags, &why)))
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      break;
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    pri->pri_public = tport_type_client; /* XXX */
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  }

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  if (!pri) {
    SU_DEBUG_3(("tport_alloc_primary: %s failed\n", why));
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    tport_zap_primary(*tbf);
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  }
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  return pri ? 0 : -1;
}

/** Bind primary transport objects used by a server application. */
int tport_bind_server(tport_master_t *mr,
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                      tp_name_t const *tpn,
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                      char const * const transports[],
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		      enum tport_via public,
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		      tagi_t *tags)
{
  char hostname[256];
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  char const *canon = NULL, *host, *service;
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  int error = 0, not_supported, family = 0;
  tport_primary_t *pri = NULL, **tbf;
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  su_addrinfo_t *ai, *res = NULL;
  unsigned port, port0, port1, old;
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  unsigned short step = 0;
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  bind6only_check(mr);
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  SU_DEBUG_5(("%s(%p) to " TPN_FORMAT "\n", __func__, mr, TPN_ARGS(tpn)));

  if (tpn->tpn_host == NULL || strcmp(tpn->tpn_host, tpn_any) == 0) {
    /* Use a local IP address */
    host = NULL;
  }
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#ifdef SU_HAVE_IN6
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  else if (tpn->tpn_host && tpn->tpn_host[0] == '[') {
    /* Remove [] around IPv6 addresses. */
    host = strcpy(hostname, tpn->tpn_host + 1);
    hostname[strlen(hostname) - 1] = '\0';
  }
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#endif
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  else
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    host = tpn->tpn_host;
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  if (tpn->tpn_port != NULL && strlen(tpn->tpn_port) > 0 &&
      strcmp(tpn->tpn_port, tpn_any) != 0)
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    service = tpn->tpn_port;
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  else 
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    service = "";
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  if (host && (strcmp(host, "0.0.0.0") == 0 || strcmp(host, "0") == 0))
    host = NULL, family = AF_INET;
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#if SU_HAVE_IN6
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  else if (host && strcmp(host, "::") == 0)
    host = NULL, family = AF_INET6;
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#endif
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  if (tpn->tpn_canon && strcmp(tpn->tpn_canon, tpn_any) &&
      (host || tpn->tpn_canon != tpn->tpn_host))
    canon = tpn->tpn_canon;

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  if (tport_server_addrinfo(mr, canon, family, 
			    host, service, tpn->tpn_proto,
			    transports, &res) < 0)
    return -1;
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  for (tbf = &mr->mr_primaries; *tbf; tbf = &(*tbf)->pri_next)
    ;

  port = port0 = port1 = ntohs(((su_sockaddr_t *)res->ai_addr)->su_port);
  error = ENOENT, not_supported = 1;
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  /* 
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   * Loop until we can bind all the transports requested 
   * by the transport user to the same port. 
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   */
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  for (;;) {
    for (ai = res; ai; ai = ai->ai_next) {
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      tp_name_t tpname[1];
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      su_addrinfo_t ainfo[1];
      su_sockaddr_t su[1];
      tport_vtable_t const *vtable;

      vtable = tport_vtable_by_name(ai->ai_canonname, public);
      if (!vtable)
	continue;

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      tport_addrinfo_copy(ainfo, su, sizeof su, ai);
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      ainfo->ai_canonname = (char *)canon;
      su->su_port = htons(port);

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      memcpy(tpname, tpn, sizeof tpname);
      tpname->tpn_canon = canon;
      tpname->tpn_host = host;

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      SU_DEBUG_9(("%s(%p): calling tport_listen for %s\n", 
		  __func__, mr, ai->ai_canonname));

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      pri = tport_listen(mr, vtable, tpname, ainfo, tags);
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      if (!pri) {
	switch (error = su_errno()) {
	case EADDRNOTAVAIL:	/* Not our address */
	case ENOPROTOOPT:	/* Protocol not supported */
	case ESOCKTNOSUPPORT:	/* Socket type not supported */
	  continue;
	default:
	  break;
	}
	break;
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      }

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      not_supported = 0;
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      if (port0 == 0 && port == 0) {
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	port = port1 = ntohs(su->su_port);
	assert(public != tport_type_server || port != 0);
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      }
    }
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    if (ai == NULL)
      break;
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    while (*tbf)
      tport_zap_primary(*tbf);
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    if (error != EADDRINUSE || port0 != 0 || port == 0)
      break;
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    while (step == 0) {
      /* step should be relative prime to 65536 - 1024 */
      /* 65536 - 1024 = 7 * 3 * 3 * 1024 */
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      step = su_randint(1, 65535 - 1024 - 1) | 1;
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      if (step % 3 == 0)
	step = (step + 2) % (65536 - 1024);
      if (step % 7 == 0)
	step = (step + 2) % (65536 - 1024);
    }
    old = port; port += step; if (port >= 65536) port -= (65536 - 1024);
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    if (port == port1)		/* All ports in use! */
      break;
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    SU_DEBUG_3(("%s(%p): cannot bind all transports to port %u, trying %u\n", 
		__func__, mr, old, port));
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  }

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  tport_freeaddrinfo(res);
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  if (res && not_supported)
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    error = EPROTONOSUPPORT;

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  if (!*tbf) {
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    su_seterrno(error);
    return -1;
  }

  return 0;
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}
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/** Check if we can bind to IPv6 separately from IPv4 bind */
static
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int bind6only_check(tport_master_t *mr)
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{
  int retval = 0;
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#if SU_HAVE_IN6
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  su_sockaddr_t su[1], su4[1];
  socklen_t sulen, su4len;
  int s6, s4;

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  if (mr->mr_boundserver)
    return 0;

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  s4 = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
  s6 = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
  
  memset(su, 0, sizeof *su);
  su->su_len = sulen = (sizeof su->su_sin6);
  su->su_family = AF_INET6;
  
  memset(su4, 0, sizeof *su4);
  su4->su_len = su4len = (sizeof su->su_sin);
  su4->su_family = AF_INET;
  
  if (bind(s6, &su->su_sa, sulen) < 0)
    ;
  else if (getsockname(s6, &su->su_sa, &sulen) < 0)
    ;
  else if ((su4->su_port = su->su_port) != 0 && 
	   bind(s4, &su4->su_sa, su4len) == 0)
    retval = 1;

  su_close(s6), su_close(s4);

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  mr->mr_bindv6only = retval;
  mr->mr_boundserver = 1;
#endif

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  return retval;
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}

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/* Number of supported transports */
#define TPORT_N (8)
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/** Return list of addrinfo structures matching to 
 * canon/host/service/protocol
 */
static
int tport_server_addrinfo(tport_master_t *mr,
			  char const *canon,
			  int family,
			  char const *host, 
			  char const *service,
			  char const *protocol,
			  char const * const transports[],
			  su_addrinfo_t **return_addrinfo)
{
  int i, N;
  su_addrinfo_t hints[TPORT_N + 1];

  *return_addrinfo = NULL;

  /* 
   * Resolve all the transports requested by the protocol
   */
  for (i = 0, N = 0; transports[i] && N < TPORT_N; i++) {
    su_addrinfo_t *ai = &hints[N];

    if (strcasecmp(transports[i], protocol) != 0 && 
	strcmp(protocol, tpn_any) != 0)
      continue;

    /* Resolve protocol, skip unknown transport protocols. */
    if (getprotohints(ai, transports[i], AI_PASSIVE) < 0)
      continue;

    ai->ai_family = family;
    ai->ai_next = &hints[++N];
  }

  if (N == 0)
    return su_seterrno(ENOENT);
  if (transports[i] /* Too many protocols */) 
    return su_seterrno(ENOMEM);

  hints[N - 1].ai_next = NULL;

  if (host) {
    int error = tport_getaddrinfo(host, service, hints, return_addrinfo);
    if (error || !*return_addrinfo) {
      SU_DEBUG_3(("%s(%p): su_getaddrinfo(%s, %s) for %s: %s\n", 
		  __func__, mr, host ? host : "\"\"", service, protocol,
		  su_gai_strerror(error)));
      return su_seterrno(error != EAI_MEMORY ? ENOENT : ENOMEM);
    }
    return 0;
  }

  return tport_get_local_addrinfo(mr, service, hints, return_addrinfo);
}

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/** Convert localinfo into addrinfo */
static
int
tport_get_local_addrinfo(tport_master_t *mr, 
			 char const *port,
			 su_addrinfo_t const *hints,
			 su_addrinfo_t **return_ai)
{
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  int error, family;
  su_localinfo_t lihints[1] = {{ 0 }};
  su_localinfo_t *li, *li_result;
  su_addrinfo_t const *h;
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  su_addrinfo_t *ai, **prev;
  su_sockaddr_t *su;
  unsigned long lport = 0;
  char *rest;

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  prev = return_ai, *prev = NULL;

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  if (port) {
    lport = strtoul(port, &rest, 10);
    if (lport >= 65536) {
      su_seterrno(EINVAL);
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      return -1;
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    }
  }

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  family = hints->ai_family;
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  for (h = hints->ai_next; h && family; h = h->ai_next)
    if (h->ai_family != family)
      family = 0;
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</