tport_sigcomp.c 20.9 KB
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/*
 * This file is part of the Sofia-SIP package
 *
 * Copyright (C) 2006 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
 * 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
 *
 */

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/**@CFILE tport_sigcomp.c Transport using SigComp.
 *
 * Incomplete.
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 *
 * See tport.docs for more detailed description of tport interface.
 *
 * @author Pekka Pessi <Pekka.Pessi@nokia.com>
 * @author Martti Mela <Martti.Mela@nokia.com>
 *
 * @date Created: Fri Mar 24 08:45:49 EET 2006 ppessi
 */

#include "config.h"

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#include "tport.h"
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#include <sofia-sip/su_string.h>
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#include <stdlib.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <limits.h>

#include <sigcomp.h>

/* ---------------------------------------------------------------------- */
/* SigComp */

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typedef struct tport_sigcomp_handler tport_sigcomp_handler_t;
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/** @internal Per end-point SigComp data */
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struct tport_compressor {
  struct sigcomp_state_handler *msc_state_handler;
  struct sigcomp_compartment *msc_compartment;
};

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/** @internal Per-socket SigComp data */
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struct tport_comp {
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  struct sigcomp_udvm          *sc_udvm;
  struct sigcomp_compartment   *sc_cc;
  struct sigcomp_compressor    *sc_compressor;
  struct sigcomp_buffer        *sc_output;
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  unsigned                      sc_compressed;
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  struct sigcomp_buffer        *sc_input;
  unsigned                      sc_copied;
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  enum {
    format_is_unknown,
    format_is_sigcomp,
    format_is_noncomp
  } sc_infmt, sc_outfmt;
};


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tport_compressor_t *vsc_master_init_sigcomp(tport_t *mr,
					     char const *algorithm)
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{
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  tport_compressor_t *retval =  NLL;
  stuct sigcomp_state_handler *sh = NULL;
  struct sigcomp_algorithm *a = NULL;
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  struct sigcomp_compartment *cc = NULL;
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  if (algorithm == NULL)
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    algorithm = getenv("SIGCOMP_ALGORITHM");

  retval = su_zalloc((su_home_t *)mr, sizeof *retval);
  if (retval == NULL)
    return retval;
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  sh = sigcomp_state_handler_create();
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  if (sh == NULL) {
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    SU_DEBUG_1(("tport: initializing SigComp state handler: %s\n",
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		strerror(errno)));
    vsc_master_deinit_sigcomp(mr, retval), retval = NULL;
    return retval;
  }
  retval->msc_state_handler = sh;

  a = sigcomp_algorithm_by_name(algorithm);
  cc = sigcomp_compartment_create(a, sh, 0, "", 0, NULL, 0);

  if (cc == NULL) {
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    SU_DEBUG_1(("tport: initializing SigComp master compartment: %s\n",
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		strerror(errno)));
    vsc_master_deinit_sigcomp(mr, retval), retval = NULL;
    return retval;
  }

  self->msc_compartment = cc;

  return retval;
}
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  if (self->sa_compartment) {
    agent_sigcomp_options(self, self->sa_compartment);
    sigcomp_compartment_option(self->sa_compartment, "stateless");
  }
  else
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  if (mr->mr_compartment)
    sigcomp_compartment_unref(mt->mr_compartment);
  mr->mr_compartment = sigcomp_compartment_ref(cc);
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  return cc;
}


void vsc_master_deinit_sigcomp(tport_master_t *mr)
{
  tport_sigcomp_vtable_t const *vsc = tport_sigcomp_vtable;

  if (mr->mr_compartment)
    sigcomp_compartment_unref(mr->mr_compartment), mr->mr_compartment = NULL;

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}

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char const *vsc_comp_name(tport_sigcomp_t const *master_sc,
			  char const *proposed_name,
			  tagi_t const *tags)
{
  if (master_sc == NULL ||
      master_sc->sc_cc == NULL ||
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      !su_casematch(compression, tport_sigcomp_name))
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    return NULL;

  return tport_sigcomp_name;
}

/** Check if transport can receive compressed messages */
int vsc_can_recv_sigcomp(tport_sigcomp_t const *sc)
{
  return sc && sc->sc_infmt != format_is_noncomp;
}

/** Check if transport can send compressed messages */
int vsc_can_send_sigcomp(tport_sigcomp_t const *sc)
{
  return sc && sc->sc_outfmt != format_is_noncomp;
}

/** Set/reset compression */
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int vsc_set_compression(tport_t *self,
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			tport_sigcomp_t *sc,
			char const *comp)
{
  if (self == NULL)
    ;
  else if (comp == NULL) {
    if (sc == NULL || sc->sc_outfmt != format_is_sigcomp) {
      self->tp_name->tpn_comp = NULL;
      return 0;
    }
  }
  else {
    comp = tport_canonize_comp(comp);

    if (comp && sc && sc->sc_outfmt != format_is_noncomp) {
      self->tp_name->tpn_comp = comp;
      return 0;
    }
  }
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  return -1;
}


/** Assign a SigComp compartment (to a possibly connected tport). */
int tport_sigcomp_assign(tport_t *self, struct sigcomp_compartment *cc)
{
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  if (tport_is_connection_oriented(self) &&
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      tport_is_secondary(self) &&
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      self->tp_socket != INVALID_SOCKET) {
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    if (self->tp_sigcomp->sc_cc) {
      if (cc == self->tp_sigcomp->sc_cc)
	return 0;

      /* Remove old assignment */
      sigcomp_compartment_unref(self->tp_sigcomp->sc_cc);
    }
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    self->tp_sigcomp->sc_cc = sigcomp_compartment_ref(cc);

    return 0;
  }

  return su_seterrno(EINVAL);
}


void vsc_sigcomp_shutdown(tport_t *self, int how)
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{
  if (self->tp_socket != -1)
    shutdown(self->tp_socket, how - 1);

  if (how >= 2 && self->tp_sigcomp->sc_cc) {
    sigcomp_compartment_unref(self->tp_sigcomp->sc_cc);
    self->tp_sigcomp->sc_cc = NULL;
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  }
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}

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static int vsc_recv_sigcomp_r(tport_t*, msg_t**, struct sigcomp_udvm*, int);
static struct sigcomp_compartment *vsc_primary_compartment(tport_master_t *);
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static int tport_sigcomp_init_secondary()
{
  if (accept) {
    if (!pri->pri_primary->tp_name->tpn_comp)
      self->tp_sigcomp->sc_infmt = format_is_noncomp;
  }
  else {
    /* XXX - no tpn here */
    if (tpn->tpn_comp == pri->pri_primary->tp_name->tpn_comp)
      self->tp_name->tpn_comp = pri->pri_primary->tp_name->tpn_comp;
    if (!pri->pri_primary->tp_name->tpn_comp)
      self->tp_sigcomp->sc_infmt = format_is_noncomp;
  }
}

static int tport_sigcomp_deinit_secondary(tport_t *self)
{
  if (self->tp_sigcomp) {
    tport_sigcomp_t *sc = self->tp_sigcomp;

    if (sc->sc_udvm)
      sigcomp_udvm_free(sc->sc_udvm), sc->sc_udvm = NULL;
    if (sc->sc_compressor)
      sigcomp_compressor_free(sc->sc_compressor), sc->sc_compressor = NULL;
  }
}

#if 0
#if HAVE_SIGCOMP
  if (tport_can_recv_sigcomp(self))
    return tport_recv_sigcomp_stream(self);
#endif
#endif

/** Try to receive stream data using SigComp. */
static int tport_recv_sigcomp_stream(tport_t *self)
{
  struct sigcomp_udvm *udvm;
  int retval;

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

  /* Peek for first byte in stream,
     determine if this is a compressed stream or not */
  if (self->tp_sigcomp->sc_infmt == format_is_unknown) {
    unsigned char sample;
    int n;

    n = recv(self->tp_socket, &sample, 1, MSG_PEEK);
    if (n < 0)
      return n;

    if (n == 0) {
      recv(self->tp_socket, &sample, 1, 0);
      return 0;			/* E-o-S from first message */
    }

    if ((sample & 0xf8) != 0xf8) {
      /* Not SigComp, receive as usual */
      if (tport_is_primary(self)) {
	SU_DEBUG_1(("%s(%p): receive semantics not implemented\n",
		    __func__, self));
	su_seterrno(EINVAL);		/* Internal error */
	return -1;
      }

      /* Do not try to receive with sigcomp from this socket */
      self->tp_sigcomp->sc_infmt = format_is_noncomp;

      return tport_recv_stream(self);
    }

    /* SigComp, receive using UDVM */
    self->tp_sigcomp->sc_infmt = format_is_sigcomp;

    /* Initialize UDVM */
    self->tp_sigcomp->sc_udvm = tport_init_udvm(self);
    if (!self->tp_sigcomp->sc_udvm) {
      int save = su_errno();
      recv(self->tp_socket, &sample, 1, 0); /* remove msg from socket */
      return su_seterrno(save);
    }
  }

  udvm = self->tp_sigcomp->sc_udvm; assert(udvm);

  retval = tport_recv_sigcomp_r(self, &self->tp_msg, udvm, N);

  if (retval < 0)
    sigcomp_udvm_reject(udvm);

  return retval;
}

/** Receive data available on the socket.
 *
 * @retval -1 error
 * @retval 0  end-of-stream
 * @retval 1  normal receive
 * @retval 2  incomplete recv, recv again
 */
static int tport_recv_sigcomp_r(tport_t *self,
				msg_t **mmsg,
				struct sigcomp_udvm *udvm,
				int N)
{
  msg_t *msg;
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  size_t n, m, i;
  int eos, complete;
  ssize_t veclen;
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  msg_iovec_t iovec[msg_n_fragments] = {{ 0 }};
  su_sockaddr_t su[1];
  socklen_t su_size = sizeof(su);
  struct sigcomp_buffer *input, *output;
  void *data;
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  size_t dlen;
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  SU_DEBUG_7(("%s(%p)\n", __func__, self));

  assert(udvm);

  if (sigcomp_udvm_has_input(udvm)) {
    input = sigcomp_udvm_input_buffer(udvm, n = N = 0); assert(input);
  }
  else {
    if (N == 0) {
      assert(self->tp_addrinfo->ai_socktype != SOCK_DGRAM);
      if (self->tp_addrinfo->ai_socktype == SOCK_DGRAM) {
	recv(self->tp_socket, (void *)su, 1, 0);
	return 1;
      }
    }

    input = sigcomp_udvm_input_buffer(udvm, N); assert(input);
    if (input == NULL)
      return su_seterrno(EIO);

    data = input->b_data + input->b_avail;
    dlen = input->b_size - input->b_avail;
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    if (tport_is_stream(self)) {
      n = recv(self->tp_socket, data, dlen, 0);
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    }
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    else if (dlen >= N) {
      n = recvfrom(self->tp_socket, data, dlen, 0, &su->su_sa, &su_size);
      SU_CANONIZE_SOCKADDR(su);
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    }
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    else {
      recvfrom(self->tp_socket, data, dlen, 0, &su->su_sa, &su_size);
      SU_CANONIZE_SOCKADDR(su);
      su_seterrno(EMSGSIZE);		/* Protocol error */
      return -1;
    }
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    if (n == (unsigned)-1) {
      char const *pn = self->tp_protoname;
      int err = su_errno();
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      if (su_is_blocking(err)) {
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	SU_DEBUG_7(("%s(%p): recv from %s: EAGAIN\n", __func__, self, pn));
	return 1;
      }
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      SU_DEBUG_1(("%s(%p): recv from %s: %s (%d)\n", __func__, self, pn,
		  su_strerror(err), err));
      return -1;
    }
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    /* XXX - in case of stream, use message buffers for output? */
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    input->b_avail += n;
    input->b_complete = (n == 0) || !tport_is_stream(self);
  }

  for (complete = eos = 0; !complete;) {
    output = sigcomp_udvm_output_buffer(udvm, 16384);
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    if (sigcomp_udvm_decompress(udvm, output, input) < 0) {
      int error = sigcomp_udvm_errno(udvm);
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      SU_DEBUG_3(("%s: UDVM error %d: %s\n", __func__,
		  error, sigcomp_udvm_strerror(udvm)));
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      su_seterrno(EREMOTEIO);

      return -1;
    }

    data = output->b_data + output->b_used;
    dlen = output->b_avail - output->b_used;
    complete = output->b_complete;
    eos = complete && input->b_complete;

    veclen = tport_recv_iovec(self, mmsg, iovec, dlen, eos);
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    if (dlen ? veclen <= 0 : veclen < 0) {
      return -1;
    }

    for (i = 0, n = 0; i < veclen; i++) {
      m = iovec[i].mv_len; assert(dlen >= n + m);
      memcpy(iovec[i].mv_base, data + n, m);
      n += m;
    }
    assert(dlen == n);

    msg = *mmsg;
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    if (msg) {
      /* Message address */
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      if (self->tp_addrinfo->ai_socktype == SOCK_STREAM)
	msg_set_address(msg, self->tp_addr, self->tp_addrlen);
      else
	msg_set_address(msg, su, su_size);
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      SU_DEBUG_5(("%s(%p): sigcomp recv = %u => %u %s\n", __func__, self,
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		  N, dlen, eos ? " (complete)" : ""));

      msg_mark_as_compressed(msg);
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      /* Write the received data to the message dump file */
      if (self->tp_master->mr_dump_file && !self->tp_pri->pri_threadpool)
	tport_dump_iovec(self, msg, n, iovec, veclen, "recv", "from");
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      msg_recv_commit(msg, dlen, eos);    /* Mark buffer as used */
    }
    else {
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      SU_DEBUG_5(("%s(%p): sigcomp recv = %u => %u %s\n", __func__, self,
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		  N, dlen, eos ? " (complete)" : ""));
      if (complete || !tport_is_stream(self)) {
	sigcomp_udvm_reject(udvm); /* Reject empty message */
      }
    }

    if (self->tp_addrinfo->ai_socktype == SOCK_STREAM) {
      if (eos)
	return 0;
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      if (output->b_complete)
	return n < N || sigcomp_udvm_has_pending_data(udvm) ? 2 : 1;

      if (!sigcomp_udvm_has_input(udvm))
	return 1;
    }
  }

  return eos ? 0 : 2;
}

static
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int vsc_send_sigcomp(tport_t const *self,
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		     msg_t *msg,
		     msg_iovec_t iov[],
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		     int iovused,
		     struct sigcomp_compartment *cc,
		     tport_sigcomp_t *sc)
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{
  struct sigcomp_compressor *c = sc->sc_compressor;
  struct sigcomp_buffer *input = sc->sc_input;
  struct sigcomp_buffer *output = sc->sc_output;
  msg_iovec_t ciov[1];

  int i, n, m, k, stream = tport_is_stream(self);
  char const *ccname;
  int ccnamelen;

  su_addrinfo_t *ai = msg_addrinfo(msg);

  int compress = (cc || (cc = sc->sc_cc)) && ai->ai_flags & TP_AI_COMPRESSED;

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  if (!compress) {
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    if (stream)
      sc->sc_outfmt = format_is_noncomp;
    ai->ai_flags &= ~TP_AI_COMPRESSED;
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    return self->tp_pri->pri_vtable->vtp_send(self, msg, iov, iovused, NULL);
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  }

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  if (stream)
    sc->sc_outfmt = format_is_sigcomp;

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  assert(cc);
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  if (c == NULL) {
    assert(input == NULL);
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    if (stream)
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      c = sigcomp_compressor_create_for_stream(cc);
    else
      c = sigcomp_compressor_create(cc);
    sc->sc_compressor = c;
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  }
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  ccname = sigcomp_compartment_name(cc, &ccnamelen);

  if (sc->sc_compressed != 0) {
    input = NONE;
  }
  else if (input == NULL) {
    int input_size = -1;

    if (tport_is_udp(self)) {
      input_size = 0;

      for (i = 0; i < iovused; i++)
	input_size += iov[i].siv_len;
    }

    sc->sc_input = input = sigcomp_compressor_input_buffer(c, input_size);

    assert(input->b_avail == 0 && input->b_used == 0);
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  }
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  else if (!input->b_complete) {
    int input_size = 0;

    for (i = 0; i < iovused; i++)
      input_size += iov[i].siv_len;

    if (input_size > input->b_size - input->b_avail)
      sigcomp_buffer_align_available(input, 0);
  }

  if (output == NULL)
    sc->sc_output = output = sigcomp_compressor_output_buffer(c, NULL);
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  if (!c || !input || !output) {
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    SU_DEBUG_3(("%s(%p): %s (%u)%s%s%s\n",
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		__func__, self, strerror(errno), errno,
		c ? "" : " (comp)",
		input ? "" : " (input)",
		output ? "" : " (output)"));
    sigcomp_compressor_free(c);
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    sc->sc_compressor = NULL;
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    sc->sc_output = NULL; sc->sc_input = NULL;
    sc->sc_compressed = 0; sc->sc_copied = 0;
    return -1;
  }

  if (sc->sc_compressed == 0) {
    k = sc->sc_copied;

    if (!input->b_complete) {
      int m = sc->sc_copied;

      for (i = 0, n = 0; i < iovused; i++) {
	char *b = iov[i].siv_base;
	int l = iov[i].siv_len;

	if (m >= l) {
	  m -= l;
	  continue;
	}

	b += m; l -= m;

	if (input->b_size == input->b_avail)
	  break;

	if (l > input->b_size - input->b_avail)
	  l = input->b_size - input->b_avail;

	memcpy(input->b_data + input->b_avail, b, l);
	input->b_avail += l; n += l; sc->sc_copied += l;

	if (l != iov[i].siv_len)
	  break;
      }
      input->b_complete = i == iovused;
      assert(stream || input->b_complete); (void)stream;
    }
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    m = output->b_avail - output->b_used;

    n = sigcomp_compressor_compress(c, output, input);
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    if (n < 0) {
      SU_DEBUG_3(("%s(%p): %s (%u)\n", __func__, self,
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		  sigcomp_compressor_strerror(c),
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		  sigcomp_compressor_errno(c)));
      sigcomp_compressor_free(c);
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      sc->sc_compressor = NULL;
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      sc->sc_output = NULL; sc->sc_input = NULL;
      sc->sc_compressed = 0;
      return -1;
    }

    assert(input->b_complete || sc->sc_copied - k > 0);

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    SU_DEBUG_5(("%s: input %u (%u new) compressed %u to %u with '%.*s'\n",
		__func__, sc->sc_copied, k, n,
		(output->b_avail - output->b_used) - m,
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		ccnamelen, ccname));

    sc->sc_compressed = n;

    assert(stream || output->b_complete);
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  }
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  else {
    assert(tport_is_connection_oriented(self));
    n = sc->sc_compressed;
  }

  assert(input && cc && c && output);

  ciov->siv_base = output->b_data + output->b_used;
  ciov->siv_len = output->b_avail - output->b_used;

  m = self->tp_pri->pri_vtable->vtp_send(self, msg, ciov, 1);
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  if (m == -1) {
    int error = su_errno();

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    if (su_is_blocking(error)) {
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      sigcomp_compressor_free(c);
      sc->sc_compressor = NULL;
      sc->sc_output = NULL; sc->sc_input = NULL;
      sc->sc_compressed = 0; sc->sc_copied = 0;
      su_seterrno(error);
    }

    return -1;
  }
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  output->b_used += m;
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  if (output->b_used < output->b_avail)
    return 0;

  if (output->b_complete) {
    sigcomp_compressor_accept(c, cc), sc->sc_output = output = NULL;
  }

  if (input != NONE && input->b_avail == input->b_used && input->b_complete)
    sigcomp_buffer_reset(input, -1), sc->sc_input = input = NULL;

  if (!input && !output) {
    sigcomp_compressor_free(c);
    sc->sc_compressor = NULL;
  }

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  assert(sc->sc_compressed >= n); assert(sc->sc_copied >= n);
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  sc->sc_compressed -= n;
  sc->sc_copied -= n;

  return n;
}

/** Initialize UDVM */
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static
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struct sigcomp_udvm *tport_init_udvm(tport_t *self)
{
  struct sigcomp_compartment *cc;
  struct sigcomp_udvm *udvm;

  if (self->tp_sigcomp->sc_udvm)
    return self->tp_sigcomp->sc_udvm;

  cc = tport_primary_compartment(self->tp_master);

  if (!cc)
    return NULL;

  if (self->tp_addrinfo->ai_socktype == SOCK_STREAM)
    udvm = sigcomp_udvm_create_for_stream(cc);
  else
    udvm = sigcomp_udvm_create_for_compartment(cc);

  return udvm;
}


/** Get primary compartment */
703
static
704 705 706 707 708 709 710
struct sigcomp_compartment *
tport_primary_compartment(tport_master_t *mr)
{
  return mr->mr_compartment;
}

/** Test if tport has a SigComp compartment is assigned to it. */
711
int vsc_has_sigcomp_assigned(tport_sigcomp_t const *sc)
712
{
713
  return sc && sc->sc_udvm != NULL;
714 715
}

716 717
static
void vsc_try_accept_sigcomp(tport_t *self, msg_t *msg)
718 719 720 721 722
{
  struct sigcomp_udvm *udvm;

  udvm = self->tp_sigcomp->sc_udvm;
  if (udvm && sigcomp_udvm_is_complete(udvm)) {
723
    if (self->tp_master->mr_tpac->tpac_sigcomp_accept &&
724 725 726 727 728 729
	self->tp_sigcomp->sc_cc == NULL) {
      tport_t *ref;
      struct tport_delivery *d;

      d = self->tp_master->mr_delivery;

730
      d->d_tport = self;
731 732 733 734 735 736 737 738 739 740 741 742 743 744 745
      d->d_msg = msg;
      d->d_udvm = &self->tp_sigcomp->sc_udvm;
      *d->d_from = *self->tp_name;

      ref = tport_incref(self);
      STACK_SIGCOMP_ACCEPT(self, msg);
      /* Reject by default */
      if (self->tp_sigcomp->sc_udvm)
	sigcomp_udvm_accept(self->tp_sigcomp->sc_udvm, NULL);
      tport_decref(&ref);

      d->d_msg = NULL;
    }
    else {
      if (tport_log->log_level >= 5) {
746
	char const *name;
747
	int namelen;
748

749
	name = sigcomp_compartment_name(self->tp_sigcomp->sc_cc, &namelen);
750
	SU_DEBUG_5(("tport(%p): msg %p SigComp implicit accept '%.*s'\n",
751 752 753 754 755 756 757 758 759
		    self, msg, namelen, name));
      }
      sigcomp_udvm_accept(udvm, self->tp_sigcomp->sc_cc);
    }
  }
}


/** Accept a SigComp message */
760 761 762
int
tport_sigcomp_accept(tport_t *self,
		     struct sigcomp_compartment *cc,
763 764 765 766 767 768 769 770 771 772 773 774 775 776
		     msg_t *msg)
{
  struct sigcomp_udvm *udvm;

  if (self == NULL || msg != self->tp_master->mr_delivery->d_msg)
    return su_seterrno(EINVAL);

  if (!self->tp_master->mr_delivery->d_udvm || cc == NONE)
    return 0;

  udvm = *self->tp_master->mr_delivery->d_udvm;

  if (udvm) {
    if (tport_log->log_level >= 5) {
777
      char const *name;
778
      int namelen;
779

780 781
      if (cc) {
	name = sigcomp_compartment_name(cc, &namelen);
782
	SU_DEBUG_5(("tport(%p): msg %p SigComp accept '%.*s'\n",
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
		    self, msg, namelen, name));
      }
      else {
	SU_DEBUG_5(("tport(%p): msg %p SigComp reject\n", self, msg));
      }
    }
    sigcomp_udvm_accept(udvm, cc);
  }

  self->tp_master->mr_delivery->d_udvm = NULL;

  return 0;
}


/** Pass message to the protocol stack */
void
tport_sigcomp_deliver(tport_t *self, msg_t *msg, su_time_t now)
{
  /* XXX - no d */

  STACK_RECV(self, msg, now);

  if (d->d_udvm && *d->d_udvm)
    sigcomp_udvm_accept(*d->d_udvm, NULL); /* reject */
}


#if HAVE_SIGCOMP && 0

813
su_inline
814 815
int msg_is_compressed(msg_t *msg)
{
816
  return msg &&
817 818 819
    (msg_addrinfo(msg)->ai_flags & TP_AI_COMPRESSED) == TP_AI_COMPRESSED;
}

820
su_inline
821 822 823 824 825 826 827
void msg_mark_as_compressed(msg_t *msg)
{
  if (msg)
    msg_addrinfo(msg)->ai_flags |= TP_AI_COMPRESSED;
}


828
struct sigcomp_udvm **tport_get_udvm_slot(tport_t *self)
829
{
830
  tport_sigcomp_vtable_t const *vsc = tport_sigcomp_vtable;
831

832
  if (vsc)
833

834 835 836 837 838
#if HAVE_SIGCOMP
  return &self->tp_sigcomp->sc_udvm;
#else
  return NULL;
#endif
839 840
}

841 842 843
struct sigcomp_compartment *
tport_sigcomp_assign_if_needed(tport_t *self,
			       struct sigcomp_compartment *cc)
844
{
845 846 847 848 849 850 851 852
  if (self->tp_name->tpn_comp) {
    if (cc)
      tport_sigcomp_assign(self, cc);
    else if (self->tp_sigcomp->sc_cc)
      cc = self->tp_sigcomp->sc_cc;
    else
      /* Use default compartment */
      cc = self->tp_master->mr_compartment;
853
  }
854
  else
855
    cc = NULL;
856

857
  return cc;
858
}
859

860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877
/** Receive data from datagram using SigComp. */
int tport_recv_sigcomp_dgram(tport_t *self, int N)
{
  char dummy[1];
  int error = EBADMSG;
#if HAVE_SIGCOMP
  struct sigcomp_udvm *udvm;

  if (self->tp_sigcomp->sc_udvm == 0)
    self->tp_sigcomp->sc_udvm = tport_init_udvm(self);

  udvm = self->tp_sigcomp->sc_udvm;

  if (udvm) {
    retval = tport_recv_sigcomp_r(self, &self->tp_msg, udvm, N);
    if (retval < 0)
      sigcomp_udvm_reject(udvm);
    return retval;
878
  }
879
  error = su_errno();
880
#endif
881 882
  recv(self->tp_socket, dummy, 1, 0); /* remove msg from socket */
  /* XXX - send NACK ? */
883
  return su_seterrno(error);
884
}