soa.c

Sofia SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification.

}

void soa_set_activity(soa_session_t *ss,
		      sdp_media_t const *m,
		      enum soa_activity activity)
{
  struct soa_media_activity *ma;
  sdp_connection_t const *c;
  int mode, swap;
  int l_audio = SOA_ACTIVE_DISABLED, r_audio = SOA_ACTIVE_DISABLED;
  int l_video = SOA_ACTIVE_DISABLED, r_video = SOA_ACTIVE_DISABLED;
  int l_chat = SOA_ACTIVE_DISABLED,  r_chat = SOA_ACTIVE_DISABLED;
  int l_image = SOA_ACTIVE_DISABLED, r_image = SOA_ACTIVE_DISABLED;

  int *l, *r;

  for (; m; m = m->m_next) {
    if (m->m_type == sdp_media_audio)
      l = &l_audio, r = &r_audio;
    else if (m->m_type == sdp_media_video)
      l = &l_video, r = &r_video;
    else if (m->m_type == sdp_media_image)
      l = &l_image, r = &r_image;
    else if (strcasecmp(m->m_type_name, "message") == 0)
      l = &l_chat, r = &r_chat;
    else
      continue;

    if (m->m_rejected) {
      if (*l < 0) *l = SOA_ACTIVE_REJECTED;
      if (*r < 0) *r = SOA_ACTIVE_REJECTED;
      continue;
    }

    mode = m->m_mode, swap = ((mode << 1) & 2) | ((mode >> 1) & 1);

    c = sdp_media_connections((sdp_media_t *)m);

    switch (activity) {
    case soa_activity_local:
      *l &= SOA_ACTIVE_SENDRECV;
      *l |= c && c->c_mcast ? swap : mode;
      break;
    case soa_activity_remote:
      *r &= SOA_ACTIVE_SENDRECV;
      *r = c && c->c_mcast ? mode : swap;
      break;
    case soa_activity_session:
      *l &= SOA_ACTIVE_SENDRECV;
      *l |= c && c->c_mcast ? swap : mode;
      *r &= SOA_ACTIVE_SENDRECV;
      *r = c && c->c_mcast ? swap : mode;
      break;
    }
  }

  if (activity == soa_activity_local ||
      activity == soa_activity_session) {
    ma = ss->ss_local_activity;
    ma->ma_audio = l_audio;
    ma->ma_video = l_video;
    ma->ma_image = l_image;
    ma->ma_chat = l_chat;
  }

  if (activity == soa_activity_remote ||
      activity == soa_activity_session) {
    ma = ss->ss_remote_activity;
    ma->ma_audio = r_audio;
    ma->ma_video = r_video;
    ma->ma_image = r_image;
    ma->ma_chat = r_chat;
  }
}

/* ----------------------------------------------------------------------*/
/* Handle SDP */


/**
 * Parses and stores session description
 * 
 * @param ss instance pointer
 * @param what caps, local or remote
 * @param sdp0 new sdp (parsed)
 * @param sdp_str new sdp (unparsed)
 * @param str_len length on unparsed data
 **/
static
int soa_set_sdp(soa_session_t *ss, 
		enum soa_sdp_kind what,
		sdp_session_t const *sdp0,
		char const *sdp_str, issize_t str_len)
{
  struct soa_description *ssd;
  int flags, new_version, retval;
  sdp_parser_t *parser = NULL;
  sdp_session_t sdp[1];

  if (ss == NULL)
    return -1;

  switch (what) {
  case soa_capability_sdp_kind:
    ssd = ss->ss_caps;
    flags = sdp_f_config;
    break;
  case soa_user_sdp_kind:
    ssd = ss->ss_user;
    flags = sdp_f_config;
    break;
  case soa_remote_sdp_kind:
    ssd = ss->ss_remote;
    flags = sdp_f_mode_0000;
    break;
  default:
    return -1;
  }

  if (sdp0) {
    new_version = sdp_session_cmp(sdp0, ssd->ssd_sdp) != 0;
    sdp_str = NULL, str_len = -1;
  }
  else if (sdp_str) {
    if (str_len == -1)
      str_len = strlen(sdp_str);
    new_version = !ssd->ssd_unparsed ||
      str0ncmp(sdp_str, ssd->ssd_unparsed, str_len + 1) != 0;
  }
  else
    return (void)su_seterrno(EINVAL), -1;

  if (!new_version) {
    if (what == soa_remote_sdp_kind) {
      *sdp = *ssd->ssd_sdp;
      /* XXX - should check changes by soa_set_remote_sdp */
      return ss->ss_actions->soa_set_remote_sdp(ss, new_version, 
						sdp, sdp_str, str_len);
    }
    return 0;
  } 

  if (sdp0) {
    /* note: case 1 - src in parsed form */
    *sdp = *sdp0;
  } 
  else /* if (sdp_str) */ {
    /* note: case 2 - src in unparsed form */
    parser = sdp_parse(ss->ss_home, sdp_str, str_len, flags | sdp_f_anynet);

    if (sdp_parsing_error(parser)) {
      sdp_parser_free(parser);
      return soa_set_status(ss, 400, "Bad Session Description");
    }

    *sdp = *sdp_session(parser);
  }
 
  switch (what) {
  case soa_capability_sdp_kind:
    retval = ss->ss_actions->soa_set_capability_sdp(ss, sdp, sdp_str, str_len);
    break;
  case soa_user_sdp_kind:
    retval =  ss->ss_actions->soa_set_user_sdp(ss, sdp, sdp_str, str_len);
    break;
  case soa_remote_sdp_kind:
    retval = ss->ss_actions->soa_set_remote_sdp(ss, 1, sdp, sdp_str, str_len);
    break;
  default:
    retval = soa_set_status(ss, 500, "Internal Error");
    break;
  }

  if (parser)
    sdp_parser_free(parser);

  return retval;
}


/** Set session descriptions. */
int soa_description_set(soa_session_t *ss,
			struct soa_description *ssd,
			sdp_session_t *sdp,
			char const *sdp_str,
			isize_t str_len)
{
  int retval = -1;

  sdp_printer_t *printer = NULL;
  sdp_session_t *sdp_new;
  char *sdp_str_new;
  char *sdp_str0_new;

  void *tbf1, *tbf2, *tbf3, *tbf4;

  /* Store description in three forms: unparsed, parsed and reprinted */

  sdp_new = sdp_session_dup(ss->ss_home, sdp);
  printer = sdp_print(ss->ss_home, sdp, NULL, 0, 0);
  sdp_str_new = (char *)sdp_message(printer);
  if (sdp_str)
    sdp_str0_new = su_strndup(ss->ss_home, sdp_str, str_len);
  else
    sdp_str0_new = sdp_str_new;
  
  if (sdp_new && printer && sdp_str_new && sdp_str0_new) {
    tbf1 = ssd->ssd_sdp, tbf2 = ssd->ssd_printer;
    tbf3 = (void *)ssd->ssd_str, tbf4 = (void *)ssd->ssd_unparsed;

    ssd->ssd_sdp = sdp_new;
    ssd->ssd_printer = printer;
    ssd->ssd_str = sdp_str_new;
    ssd->ssd_unparsed = sdp_str0_new;      

    retval = 1;
  }
  else {
    tbf1 = sdp_new, tbf2 = printer, tbf3 = sdp_str_new, tbf4 = sdp_str0_new;
  }
  
  su_free(ss->ss_home, tbf1);
  sdp_printer_free(tbf2);
  if (tbf3 != tbf4)
    su_free(ss->ss_home, tbf4);

  return retval;
}


/** Duplicate a session descriptions. */
int soa_description_dup(su_home_t *home, 
			struct soa_description *ssd,
			struct soa_description const *ssd0)
{
  if (ssd0->ssd_sdp) {
    ssd->ssd_sdp = sdp_session_dup(home, ssd0->ssd_sdp);
    ssd->ssd_printer = sdp_print(home, ssd->ssd_sdp, NULL, 0, 0);
    ssd->ssd_str = (char *)sdp_message(ssd->ssd_printer);
    if (ssd0->ssd_str != ssd0->ssd_unparsed)
      ssd->ssd_unparsed = su_strdup(home, ssd0->ssd_unparsed);
    else
      ssd->ssd_unparsed = ssd->ssd_str;
  }

  return 0;
}

/** Free session descriptions. */
void soa_description_free(soa_session_t *ss, 
			  struct soa_description *ssd)
{
  void *tbf1, *tbf2, *tbf3, *tbf4;

  tbf1 = ssd->ssd_sdp, tbf2 = ssd->ssd_printer;
  tbf3 = (void *)ssd->ssd_str, tbf4 = (void *)ssd->ssd_unparsed;

  memset(ssd, 0, sizeof *ssd);

  su_free(ss->ss_home, tbf1);
  sdp_printer_free(tbf2);
  if (tbf3 != tbf4)
    su_free(ss->ss_home, tbf4);
}


/** Initialize SDP o= line */
int
soa_init_sdp_origin(soa_session_t *ss, sdp_origin_t *o, char buffer[64])
{
  sdp_connection_t *c;

  if (ss == NULL || o == NULL)
    return su_seterrno(EFAULT), -1;

  assert(o->o_address);

  if (!o->o_username)
    o->o_username = "-";

  if (o->o_id == 0)
    su_randmem(&o->o_id, sizeof o->o_id);
  o->o_id &= ((unsigned longlong)1 << 63) - 1;

  if (o->o_version == 0)
    su_randmem(&o->o_version, sizeof o->o_version);
  o->o_version &= ((unsigned longlong)1 << 63) - 1;

  c = o->o_address;

  if (!c->c_nettype ||
      !c->c_address ||
      strcmp(c->c_address, "") == 0 ||
      strcmp(c->c_address, "0.0.0.0") == 0 ||
      strcmp(c->c_address, "::") == 0 ||
      !host_is_local(c->c_address)) {
    return soa_init_sdp_connection(ss, c, buffer);
  }

  return 0;
}

/** Search for an local address item from string provided by user */
static
su_localinfo_t *li_in_list(su_localinfo_t *li0, char const **llist)
{
  char const *list = *llist;
  size_t n;

  if (!list)
    return NULL;

  while ((n = strcspn(list, ", "))) {
    su_localinfo_t *li;

    for (li = li0; li; li = li->li_next) {
      if (strncasecmp(li->li_canonname, list, n) == 0 &&
	  li->li_canonname[n] == '\0')
	break;
    }

    list += n; while (list[0] == ' ' || list[0] == ',') list++;
    *llist = list;

    if (li)
      return li;
  }

  return NULL;
}


/** Obtain a local address for SDP connection structure */
int
soa_init_sdp_connection(soa_session_t *ss,
			sdp_connection_t *c,
			char buffer[64])
{
  su_localinfo_t *res, hints[1] = {{ LI_CANONNAME | LI_NUMERIC }};
  su_localinfo_t *li, *li4, *li6;
  char const *address;
  int ip4, ip6, error;

  if (ss == NULL || c == NULL)
    return su_seterrno(EFAULT), -1;

  address = ss->ss_address;

  if (host_is_ip_address(address)) {
    /* Use the application-specified address -
     * do not check that it is found from the local address list */
    c->c_nettype = sdp_net_in;
    
    if (host_is_ip4_address(address))
      c->c_addrtype = sdp_addr_ip4;
    else
      c->c_addrtype = sdp_addr_ip6;
    
    if (!host_is_ip6_reference(address)) {
      c->c_address = strcpy(buffer, address);
    }
    else {
      /* Remove brackets [] around the reference */
      size_t len = strlen(address + 1);
      c->c_address = memcpy(buffer, address + 1, len - 1);
      buffer[len - 1] = '\0'; 
    }
    return 0;
  }

  /* XXX - using LI_SCOPE_LINK requires some tweaking */
  hints->li_scope = LI_SCOPE_GLOBAL | LI_SCOPE_SITE /* | LI_SCOPE_LINK */;

  switch (ss->ss_af) {
  case SOA_AF_IP4_ONLY:
    hints->li_family = AF_INET, ip4 = 1, ip6 = 0;
    break;

#if HAVE_SIN6
  case SOA_AF_IP6_ONLY:
    hints->li_family = AF_INET6, ip6 = 1, ip4 = 0;
    break;
  case SOA_AF_IP4_IP6:
    ip4 = 2, ip6 = 1;
    break;
  case SOA_AF_IP6_IP4:
    ip4 = 1, ip6 = 2;
    break;
#endif
  default:
    ip4 = ip6 = 1;
  }

  for (res = NULL; res == NULL;) {
    if ((error = su_getlocalinfo(hints, &res)) < 0 
	&& error != ELI_NOADDRESS) {
      SU_DEBUG_1(("%s: su_localinfo: %s\n", __func__,
		  su_gli_strerror(error)));
      return -1;
    }
    if (hints->li_scope & LI_SCOPE_HOST)
      break;
    hints->li_scope |= LI_SCOPE_HOST;
  }

  if (!(ip4 & ip6 && c->c_nettype == sdp_net_in))
    /* Use ss_af preference */;
  else if (c->c_addrtype == sdp_addr_ip4)
    ip4 = 2, ip6 = 1;
  else if (c->c_addrtype == sdp_addr_ip6)
    ip6 = 2, ip4 = 1;

  if (address)
    SU_DEBUG_3(("%s: searching for %s from list \"%s\"\n",
		__func__, ip6 && !ip4 ? "IP6 " : !ip6 && ip4 ? "IP4 " : "",
		address));

  li = res, li4 = NULL, li6 = NULL;

  for (;;) {
    if (address)
      li = li_in_list(li, &address);

    if (!li)
      break;
#if HAVE_SIN6
    else if (li->li_family == AF_INET6) {
      if (ip6 >= ip4)
	break;
      else if (!li6)
	li6 = li;		/* Best IP6 address */
    }
#endif
    else if (li->li_family == AF_INET) {
      if (ip4 > ip6)
	break;
      else if (!li4)
	li4 = li;		/* Best IP4 address */
    }

    if (!address)
      li = li->li_next;
  }

  if (li == NULL)
    li = li4;
  if (li == NULL)
    li = li6;

  if (li == NULL)
    ;
  else if (li->li_family == AF_INET)
    c->c_nettype = sdp_net_in,  c->c_addrtype = sdp_addr_ip4;
#if HAVE_SIN6
  else if (li->li_family == AF_INET6)
    c->c_nettype = sdp_net_in,  c->c_addrtype = sdp_addr_ip6;
#endif

  if (li) {
    assert(strlen(li->li_canonname) < 64);
    c->c_address = strcpy(buffer, li->li_canonname);
  }

  su_freelocalinfo(res);

  if (!li)
    return -1;
  else
    return 0;
}