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Go to the documentation of this file.
 * This file is part of the Sofia-SIP package
 * Copyright (C) 2005 Nokia Corporation.
 * Contact: Pekka Pessi <pekka.pessi@nokia.com>
 * This library is free software; you can redistribute it and/or
 * 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
 * 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

/** Defined when <tport_internal.h> has been included. */

 * @file tport_internal.h
 * @brief Internal implementation of transport interface
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 * @date Created: Thu Jun 29 15:58:06 2000 ppessi

#ifndef SU_H
#include <sofia-sip/su.h>

#include <sofia-sip/su_uniqueid.h>

#ifndef MSG_ADDR_H
#include <sofia-sip/msg_addr.h>
#ifndef TPORT_H
#include <sofia-sip/tport.h>

#include "sofia-sip/stun.h"
#include "sofia-sip/stun_tag.h"

#include <sofia-sip/tport_plugins.h>

#ifndef SU_DEBUG
#define SU_DEBUG 3
#define SU_LOG   tport_log

#include <sofia-sip/su_debug.h>

#if !defined(MSG_NOSIGNAL) || defined(__CYGWIN__) || defined(SYMBIAN)
#define MSG_NOSIGNAL (0)

#if (_WIN32_WINNT >= 0x0600)
#define HAVE_MSG_TRUNC 1

#define MSG_TRUNC (0)

#ifndef NONE
#define NONE ((void *)-1)


typedef struct tport_master tport_master_t;
typedef struct tport_pending_s tport_pending_t;
typedef struct tport_primary tport_primary_t;
typedef struct tport_vtable tport_vtable_t;

struct sigcomp_state_handler;
struct sigcomp_algorithm;
struct sigcomp_udvm;
struct sigcomp_magic;
struct sigcomp_compartment;

typedef long unsigned LU;     /* for printf() and friends */

/** @internal Transport parameters */
00100 typedef struct {
00101   unsigned tpp_mtu;           /**< Maximum packet size */
00102   unsigned tpp_idle;          /**< Allowed connection idle time. */
00103   unsigned tpp_timeout;       /**< Allowed idle time for message. */
00104   unsigned tpp_keepalive;     /**< Keepalive PING interval */
00105   unsigned tpp_pingpong;      /**< PONG-to-PING interval */

00107   unsigned tpp_sigcomp_lifetime;  /**< SigComp compartment lifetime  */
00108   unsigned tpp_thrpsize;      /**< Size of thread pool */

00110   unsigned tpp_thrprqsize;    /**< Length of per-thread recv queue */
00111   unsigned tpp_qsize;         /**< Size of queue */

00113   unsigned tpp_drop;          /**< Packet drop probablity */
00114   int      tpp_tos;           /**< IP TOS */

00116   unsigned tpp_conn_orient:1;   /**< Connection-orienteded */
00117   unsigned tpp_sdwn_error:1;  /**< If true, shutdown is error. */
00118   unsigned tpp_stun_server:1; /**< If true, use stun server */
00119   unsigned tpp_pong2ping:1;   /**< If true, respond with pong to ping */

  unsigned :0;

} tport_params_t;

/** @internal Transport object.
 * A transport object can be used in three roles, to represent transport
 * list (aka master transport), to represent available transports (aka
 * primary transport) and to represent actual transport connections (aka
 * secondary transport).
00133 struct tport_s {
00134   su_home_t           tp_home[1];       /**< Memory home */

00136   ssize_t             tp_refs;            /**< Number of references to tport */

00138   unsigned            tp_black:1;       /**< Used by red-black-tree */
00140   unsigned            tp_accepted:1;    /**< Originally server? */
00141   unsigned            tp_conn_orient:1;   /**< Is connection-oriented */
00142   unsigned            tp_has_connection:1; /**< Has real connection */
00143   unsigned            tp_reusable:1;    /**< Can this connection be reused */
  unsigned            tp_closed : 1;
00145   /**< This transport is closed.
   * A closed transport is inserted into pri_closed list.

  /** Remote end has sent FIN (2) or we should not just read */
00151   unsigned            tp_recv_close:2;
  /** We will send FIN (1) or have sent FIN (2) */
00153   unsigned            tp_send_close:2; 
  unsigned            tp_has_keepalive:1;
  unsigned            tp_has_stun_server:1;
  unsigned            tp_trunc:1;
00157   unsigned            tp_is_connected:1; /**< Connection is established */

00160   tport_t *tp_left, *tp_right, *tp_dad; /**< Links in tport tree */

00162   tport_master_t     *tp_master;        /**< Master transport */
00163   tport_primary_t    *tp_pri;           /**< Primary transport */

00165   tport_params_t     *tp_params;        /**< Transport parameters */

00167   tp_magic_t         *tp_magic;     /**< Context provided by consumer */

00169   su_timer_t         *tp_timer;             /**< Timer object */

00171   su_time_t           tp_ktime;             /**< Keepalive timer updated */
00172   su_time_t           tp_ptime;             /**< Ping sent */

00174   tp_name_t           tp_name[1];   /**< Transport name.
                               * This is either our name (if primary)
                               * or peer name (if secondary).

#define tp_protoname tp_name->tpn_proto
#define tp_canon     tp_name->tpn_canon
#define tp_host      tp_name->tpn_host
#define tp_port      tp_name->tpn_port
#define tp_ident     tp_name->tpn_ident

00186   su_socket_t           tp_socket;  /**< Socket of this tport*/
00187   int                 tp_index;           /**< Root registration index */
00188   int                 tp_events;        /**< Subscribed events */

00190   su_addrinfo_t       tp_addrinfo[1];   /**< Peer/own address info */
00191   su_sockaddr_t       tp_addr[1];   /**< Peer/own address */
#define tp_addrlen tp_addrinfo->ai_addrlen

  /* ==== Receive queue ================================================== */

00196   msg_t          *tp_msg;           /**< Message being received */
00197   msg_t const        *tp_rlogged;       /**< Last logged when receiving */
00198   su_time_t           tp_rtime;             /**< Last time received data */
00199   unsigned short      tp_ping;              /**< Whitespace ping being received */

  /* ==== Pending messages =============================================== */

00203   unsigned short      tp_reported;      /**< Report counter */
00204   unsigned            tp_plen;          /**< Size of tp_pending */
00205   unsigned            tp_pused;         /**< Used pends */
00206   tport_pending_t    *tp_pending;       /**< Pending requests */
00207   tport_pending_t    *tp_released;      /**< Released pends */
  /* ==== Send queue ===================================================== */

00211   msg_t             **tp_queue;           /**< Messages being sent */
00212   unsigned short      tp_qhead;           /**< Head of queue */

00214   msg_iovec_t        *tp_unsent;    /**< Pointer to first unsent iovec */
00215   size_t              tp_unsentlen; /**< Number of unsent iovecs */

00217   msg_iovec_t        *tp_iov;       /**< Iovecs allocated for sending */
00218   size_t              tp_iovlen;    /**< Number of allocated iovecs */

00220   msg_t const        *tp_slogged;       /**< Last logged when sending */
00221   su_time_t           tp_stime;             /**< Last time sent message */

  /* ==== Extensions  ===================================================== */

  tport_compressor_t *tp_comp;

  /* ==== Statistics  ===================================================== */
  struct {
    uint64_t sent_msgs, sent_errors, sent_bytes, sent_on_line;
    uint64_t recv_msgs, recv_errors, recv_bytes, recv_on_line;
  } tp_stats;

/** @internal Primary structure */
00236 struct tport_primary {
00237   tport_t             pri_primary[1];   /**< Transport part */
  su_home_t           pri_home[1];
#define pri_home      pri_primary->tp_home
#define pri_master    pri_primary->tp_master
#define pri_protoname pri_primary->tp_name->tpn_proto
  tport_vtable_t const
00247   int                 pri_public;       /**< Type of primary transport; 
                               * tport_type_local,
                               * tport_type_stun, etc. 

00252   tport_primary_t    *pri_next;             /**< Next primary tport */

00254   tport_t            *pri_open;           /**< Open secondary tports */
00255   tport_t            *pri_closed;       /**< Closed secondary tports */

00257   unsigned            pri_updating:1;   /**< Currently updating address */
00258   unsigned            pri_natted:1; /**< Using natted address  */
00259   unsigned            pri_has_tls:1;      /**< Supports tls  */

  void               *pri_stun_handle;

00264   tport_params_t      pri_params[1];      /**< Transport parameters */

/** @internal Master structure */
00268 struct tport_master {
  tport_t             mr_master[1];
  su_home_t           mr_home[1];
#define mr_home mr_master->tp_home

00276   int                 mr_stun_step_ready; /**< for stun's callback */

00278   tp_stack_t           *mr_stack;         /**< Transport consumer */
00280                const *mr_tpac;            /**< Methods provided by stack */
00281   int                 mr_log;         /**< Do logging of parsed messages */
00282   su_root_t            *mr_root;          /**< SU root pointer */

  /**< Timer reclaiming unused connections and compartment */
  su_timer_t         *mr_timer;           
  /** FILE to dump received and sent data */
00287   FILE               *mr_dump_file; 
00288   char               *mr_dump;      /**< Filename for dumping received/sent data */
00289   tport_primary_t    *mr_primaries;        /**< List of primary contacts */

  tport_params_t      mr_params[1];
00293   unsigned            mr_boundserver:1; /**< Server has been bound */
00294   unsigned            mr_bindv6only:1; /**< We can bind separately to IPv6/4 */
  unsigned :0;

  /* Delivery context */
  struct tport_delivery {
    tport_t              *d_tport;
    msg_t                *d_msg;
    tp_name_t             d_from[1];
    tport_compressor_t   *d_comp;
  } mr_delivery[1];

  tport_stun_server_t *mr_stun_server;

#if 0
  struct tport_nat_s {
    int initialized;
    int bound;
    int stun_enabled;
    char *external_ip_address;
    int try_stun;
    tport_master_t *tport;
    char *stun_server;
    /* stun_socket_t *stun_socket; */
    stun_handle_t *stun;
    su_socket_t stun_socket;
    su_sockaddr_t sockaddr;
  }                   mr_nat[1];

/** @internal Virtual function table for transports */
00331 struct tport_vtable
  char const *vtp_name;
  enum tport_via vtp_public;

  size_t vtp_pri_size;        /* Size of primary tport */
  int (*vtp_init_primary)(tport_primary_t *pri,
                    tp_name_t tpn[1],
                    su_addrinfo_t *ai, tagi_t const *,
                    char const **return_culprit);
  void (*vtp_deinit_primary)(tport_primary_t *pri);
  int (*vtp_wakeup_pri)(tport_primary_t *pri, int events);
  tport_t *(*vtp_connect)(tport_primary_t *pri, su_addrinfo_t *ai, 
                    tp_name_t const *tpn);

  size_t vtp_secondary_size;  /* Size of secondary tport */

  int (*vtp_init_secondary)(tport_t *, int socket, int accepted,
                      char const **return_reason);
  void (*vtp_deinit_secondary)(tport_t *);
  void (*vtp_shutdown)(tport_t *, int how);
  int (*vtp_set_events)(tport_t const *self);
  int (*vtp_wakeup)(tport_t *self, int events);
  int (*vtp_recv)(tport_t *self);
  ssize_t (*vtp_send)(tport_t const *self, msg_t *msg,
                  msg_iovec_t iov[], size_t iovused);
  void (*vtp_deliver)(tport_t *self,  msg_t *msg, su_time_t now);
  int (*vtp_prepare)(tport_t *self, msg_t *msg, 
                 tp_name_t const *tpn, 
                 struct sigcomp_compartment *cc,
                 unsigned mtu);
  int (*vtp_keepalive)(tport_t *self, su_addrinfo_t const *ai,
                   tagi_t const *taglist);
  int (*vtp_stun_response)(tport_t const *self,
                     void *msg, size_t msglen,
                     void *addr, socklen_t addrlen);
  int (*vtp_next_secondary_timer)(tport_t *self, su_time_t *, 
                          char const **return_why);
  void (*vtp_secondary_timer)(tport_t *self, su_time_t);

int tport_register_type(tport_vtable_t const *vtp);

/** @internal Test if transport needs connect() before sending. */
00375 su_inline int tport_is_connection_oriented(tport_t const *self)
  return self->tp_conn_orient;

/** @internal Test if transport involves connection. @NEW_1_12_5. */
00381 su_inline int tport_has_connection(tport_t const *self)
  return self->tp_has_connection;

void tport_has_been_updated(tport_t *tport);

int tport_primary_compression(tport_primary_t *pri,
                        char const *compression,
                        tagi_t const *tl);

void tport_set_tos(su_socket_t socket, su_addrinfo_t *ai, int tos);

tport_t *tport_base_connect(tport_primary_t *pri, 
                      su_addrinfo_t *ai,
                      su_addrinfo_t *name,
                      tp_name_t const *tpn);

int tport_stream_init_primary(tport_primary_t *pri, 
                        su_socket_t socket,
                        tp_name_t tpn[1],
                        su_addrinfo_t *ai,
                        tagi_t const *tags,
                        char const **return_reason);

tport_t *tport_alloc_secondary(tport_primary_t *pri,
                         int socket,
                         int accepted,
                         char const **return_reason);

int tport_accept(tport_primary_t *pri, int events);
void tport_zap_secondary(tport_t *self);

int tport_set_secondary_timer(tport_t *self);
void tport_base_timer(tport_t *self, su_time_t now);

int tport_bind_socket(int socket,
                  su_addrinfo_t *ai,
                  char const **return_culprit);
void tport_close(tport_t *self);
int tport_shutdown0(tport_t *self, int how);

int tport_has_queued(tport_t const *self);

int tport_error_event(tport_t *self);
void tport_recv_event(tport_t *self);
void tport_send_event(tport_t *self);
void tport_hup_event(tport_t *self);

ssize_t tport_recv_iovec(tport_t const *self, 
                   msg_t **mmsg,
                   msg_iovec_t iovec[msg_n_fragments], size_t N, 
                   int exact);

msg_t *tport_msg_alloc(tport_t const *self, usize_t size);

int tport_prepare_and_send(tport_t *self, msg_t *msg, 
                     tp_name_t const *tpn, 
                     struct sigcomp_compartment *cc,
                     unsigned mtu);
int tport_send_msg(tport_t *self, msg_t *msg, 
               tp_name_t const *tpn, 
               struct sigcomp_compartment *cc);

void tport_send_queue(tport_t *self);

void tport_deliver(tport_t *self, msg_t *msg, msg_t *next, 
               tport_compressor_t *comp,
               su_time_t now);
void tport_base_deliver(tport_t *self, msg_t *msg, su_time_t now);

int tport_recv_error_report(tport_t *self);
void tport_error_report(tport_t *self, int errcode, 
                  su_sockaddr_t const *addr);

int tport_open_log(tport_master_t *mr, tagi_t *tags);
void tport_log_msg(tport_t *tp, msg_t *msg, char const *what, 
               char const *via, su_time_t now);
void tport_dump_iovec(tport_t const *self, msg_t *msg, 
                  size_t n, su_iovec_t const iov[], size_t iovused,
                  char const *what, char const *how);

int tport_tcp_ping(tport_t *self, su_time_t now);
int tport_tcp_pong(tport_t *self);

extern tport_vtable_t const tport_udp_vtable;
extern tport_vtable_t const tport_udp_client_vtable;

int tport_udp_init_primary(tport_primary_t *, 
                     tp_name_t tpn[1], 
                     su_addrinfo_t *, 
                     tagi_t const *,
                     char const **return_culprit);
void tport_udp_deinit_primary(tport_primary_t *);
int tport_recv_dgram(tport_t *self);
ssize_t tport_send_dgram(tport_t const *self, msg_t *msg,
                   msg_iovec_t iov[], size_t iovused);
int tport_udp_error(tport_t const *self, su_sockaddr_t name[1]);

extern tport_vtable_t const tport_tcp_vtable;
extern tport_vtable_t const tport_tcp_client_vtable;

int tport_tcp_init_primary(tport_primary_t *, 
                    tp_name_t  tpn[1], 
                    su_addrinfo_t *, tagi_t const *,
                    char const **return_culprit);
int tport_tcp_init_client(tport_primary_t *, 
                   tp_name_t tpn[1], 
                   su_addrinfo_t *, tagi_t const *,
                   char const **return_culprit);
int tport_tcp_init_secondary(tport_t *self, int socket, int accepted,
                       char const **return_reason);
int tport_recv_stream(tport_t *self);
ssize_t tport_send_stream(tport_t const *self, msg_t *msg,
                    msg_iovec_t iov[], size_t iovused);

int tport_tcp_next_timer(tport_t *self, su_time_t *, char const **);
void tport_tcp_timer(tport_t *self, su_time_t);

int tport_next_recv_timeout(tport_t *, su_time_t *, char const **);
void tport_recv_timeout_timer(tport_t *self, su_time_t now);

int tport_next_keepalive(tport_t *self, su_time_t *, char const **);
void tport_keepalive_timer(tport_t *self, su_time_t now);

extern tport_vtable_t const tport_sctp_vtable;
extern tport_vtable_t const tport_sctp_client_vtable;
extern tport_vtable_t const tport_tls_vtable;
extern tport_vtable_t const tport_tls_client_vtable;
extern tport_vtable_t const tport_stun_vtable;
extern tport_vtable_t const tport_http_connect_vtable;
extern tport_vtable_t const tport_threadpool_vtable;

typedef struct tport_descriptor_s {
  char const *tpd_name;
  tport_vtable_t *tpd_vtable;
  su_addrinfo_t *tpd_hints;
  int tpd_is_client_only;
} tport_descriptor_t;

typedef int const *(tport_set_f)(tport_master_t *mr, 
                         tp_name_t const *tpn,
                         tagi_t const *taglist,
                         tport_descriptor_t **return_set,
                         int return_set_size);

/* STUN plugin */

int tport_init_stun_server(tport_master_t *mr, tagi_t const *tags);
void tport_deinit_stun_server(tport_master_t *mr);
int tport_recv_stun_dgram(tport_t const *self, msg_t **in_out_msg,
                    su_sockaddr_t *from, socklen_t fromlen);

int tport_stun_server_add_socket(tport_t *tp);
int tport_stun_server_remove_socket(tport_t *tp);

void tport_recv_bytes(tport_t *self, ssize_t bytes, ssize_t on_line);
void tport_recv_message(tport_t *self, msg_t *msg, int error);

void tport_sent_bytes(tport_t *self, ssize_t bytes, ssize_t on_line);
void tport_sent_message(tport_t *self, msg_t *msg, int error);

/* ---------------------------------------------------------------------- */
/* Compressor plugin */
extern tport_comp_vtable_t const *tport_comp_vtable;

char const *tport_canonize_comp(char const *comp);

int tport_init_compressor(tport_t *,
                    char const *comp_name,
                    tagi_t const *tags);
void tport_deinit_compressor(tport_t *);

struct sigcomp_compartment *
tport_sigcomp_assign_if_needed(tport_t *self,
                         struct sigcomp_compartment *cc);

struct sigcomp_udvm **tport_get_udvm_slot(tport_t *self);

void tport_sigcomp_accept_incomplete(tport_t *self, msg_t *msg);

int tport_recv_comp_dgram(tport_t const *self,
                    tport_compressor_t *sc,
                    msg_t **in_out_msg,
                    su_sockaddr_t *from,
                    socklen_t fromlen);

ssize_t tport_send_comp(tport_t const *self,
                msg_t *msg, 
                msg_iovec_t iov[], 
                size_t iovused,
                struct sigcomp_compartment *cc,
                tport_compressor_t *sc);


#endif /* TPORT_INTERNAL_H */

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