pjsip_message_filter.c File Reference

#include "asterisk.h"
#include <pjsip.h>
#include <pjsip_ua.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "include/res_pjsip_private.h"
#include "asterisk/module.h"

Include dependency graph for pjsip_message_filter.c:

Go to the source code of this file.

Data Structures
struct	filter_message_restrictions
	Outgoing message modification restrictions. More...

Macros
#define	FUNC_ATTRS   __attribute__ ((noinline))
#define	is_sip_uri(uri)   (PJSIP_URI_SCHEME_IS_SIP(uri) || PJSIP_URI_SCHEME_IS_SIPS(uri))
#define	MOD_DATA_RESTRICTIONS   "restrictions"

Enumerations
enum	uri_type { URI_TYPE_REQUEST = -1, URI_TYPE_TO = PJSIP_H_TO, URI_TYPE_FROM = PJSIP_H_FROM, URI_TYPE_CONTACT = PJSIP_H_CONTACT }

Functions
void	ast_res_pjsip_cleanup_message_filter (void)
int	ast_res_pjsip_init_message_filter (void)
static pj_bool_t	filter_on_rx_message (pjsip_rx_data *rdata)
static pj_status_t	filter_on_tx_message (pjsip_tx_data *tdata)
static void	filter_outgoing_message (struct ast_sip_endpoint *endpoint, struct ast_sip_contact *contact, struct pjsip_tx_data *tdata)
	Callback invoked on non-session outgoing messages. More...
static void	filter_session_outgoing_message (struct ast_sip_session *session, struct pjsip_tx_data *tdata)
	Callback invoked on session outgoing messages. More...
static struct filter_message_restrictions *	get_restrictions (pjsip_tx_data *tdata)
	Helper function to get (or allocate if not already present) restrictions on a message. More...
static pjsip_transport *	get_udp_transport (pj_str_t *address, int port)
	Helper function which returns a UDP transport bound to the given address and port. More...
static int	is_bound_any (pjsip_transport *transport)
	Helper function which determines if a transport is bound to any. More...
static int	multihomed_rewrite_sdp (struct pjmedia_sdp_session *sdp)
	Helper function which determines if the address within SDP should be rewritten. More...
static pj_bool_t	on_rx_process_symmetric_transport (pjsip_rx_data *rdata)
static pj_bool_t	on_rx_process_uris (pjsip_rx_data *rdata)
static void	print_sanitize_debug (char *msg, pjsip_uri_context_e context, pjsip_sip_uri *uri)
static void	print_uri_debug (enum uri_type ut, pjsip_rx_data *rdata, pjsip_hdr *hdr)
static void	remove_x_ast_params (pjsip_uri *header_uri)
static void FUNC_ATTRS	sanitize_tdata (pjsip_tx_data *tdata)

Variables
static pjsip_module	filter_module_transport
static pjsip_module	filter_module_tsx
static struct ast_sip_session_supplement	filter_session_supplement
	PJSIP Session Supplement for tagging messages with restrictions. More...
static struct ast_sip_supplement	filter_supplement
	PJSIP Supplement for tagging messages with restrictions. More...

Macro Definition Documentation

FUNC_ATTRS

#define FUNC_ATTRS   __attribute__ ((noinline))

Definition at line 180 of file pjsip_message_filter.c.

is_sip_uri

#define is_sip_uri

(

uri

)

(PJSIP_URI_SCHEME_IS_SIP(uri) || PJSIP_URI_SCHEME_IS_SIPS(uri))

Definition at line 163 of file pjsip_message_filter.c.

Referenced by on_rx_process_uris(), and sanitize_tdata().

MOD_DATA_RESTRICTIONS

#define MOD_DATA_RESTRICTIONS   "restrictions"

Definition at line 29 of file pjsip_message_filter.c.

Referenced by filter_on_tx_message(), and get_restrictions().

Enumeration Type Documentation

uri_type

enum uri_type

Enumerator
URI_TYPE_REQUEST
URI_TYPE_TO
URI_TYPE_FROM
URI_TYPE_CONTACT

Definition at line 358 of file pjsip_message_filter.c.

              {
   URI_TYPE_REQUEST = -1,
   URI_TYPE_TO = PJSIP_H_TO,
   URI_TYPE_FROM = PJSIP_H_FROM,
   URI_TYPE_CONTACT = PJSIP_H_CONTACT,
};

Function Documentation

ast_res_pjsip_cleanup_message_filter()

void ast_res_pjsip_cleanup_message_filter

(

void

)

Definition at line 565 of file pjsip_message_filter.c.

References ast_sip_session_unregister_supplement(), ast_sip_unregister_service(), ast_sip_unregister_supplement(), filter_module_transport, and filter_module_tsx.

Referenced by ast_res_pjsip_init_message_filter(), and unload_pjsip().

{
   ast_sip_unregister_service(&filter_module_tsx);
   ast_sip_unregister_service(&filter_module_transport);
   ast_sip_unregister_supplement(&filter_supplement);
   ast_sip_session_unregister_supplement(&filter_session_supplement);
}

ast_res_pjsip_init_message_filter()

int ast_res_pjsip_init_message_filter

(

void

)

Definition at line 573 of file pjsip_message_filter.c.

References ast_log, ast_res_pjsip_cleanup_message_filter(), ast_sip_register_service(), ast_sip_register_supplement(), ast_sip_session_register_supplement, filter_module_transport, filter_module_tsx, and LOG_ERROR.

Referenced by load_module().

{
   ast_sip_session_register_supplement(&filter_session_supplement);
   ast_sip_register_supplement(&filter_supplement);

   if (ast_sip_register_service(&filter_module_transport)) {
      ast_log(LOG_ERROR, "Could not register message filter module for incoming and outgoing requests\n");
      ast_res_pjsip_cleanup_message_filter();
      return -1;
   }

   if (ast_sip_register_service(&filter_module_tsx)) {
      ast_log(LOG_ERROR, "Could not register message filter module for incoming and outgoing requests\n");
      ast_res_pjsip_cleanup_message_filter();
      return -1;
   }

   return 0;
}

filter_on_rx_message()

static pj_bool_t filter_on_rx_message ( pjsip_rx_data *  rdata )

static

Definition at line 548 of file pjsip_message_filter.c.

References on_rx_process_symmetric_transport(), and on_rx_process_uris().

{
   pj_bool_t rc;

   rc = on_rx_process_uris(rdata);
   if (rc == PJ_TRUE) {
      return rc;
   }

   rc = on_rx_process_symmetric_transport(rdata);
   if (rc == PJ_TRUE) {
      return rc;
   }

   return PJ_FALSE;
}

filter_on_tx_message()

static pj_status_t filter_on_tx_message ( pjsip_tx_data *  tdata )

static

Definition at line 225 of file pjsip_message_filter.c.

References ast_debug, ast_sip_get_pjsip_endpoint(), ast_sip_is_content_type(), ast_sip_mod_data_get, filter_message_restrictions::disallow_from_domain_modification, filter_module_transport, get_udp_transport(), is_bound_any(), MOD_DATA_RESTRICTIONS, multihomed_rewrite_sdp(), NULL, and sanitize_tdata().

{
   struct filter_message_restrictions *restrictions =
      ast_sip_mod_data_get(tdata->mod_data, filter_module_transport.id, MOD_DATA_RESTRICTIONS);
   pjsip_tpmgr_fla2_param prm;
   pjsip_cseq_hdr *cseq;
   pjsip_via_hdr *via;
   pjsip_fromto_hdr *from;
   pjsip_tpselector sel;

   sanitize_tdata(tdata);

   /* Use the destination information to determine what local interface this message will go out on */
   pjsip_tpmgr_fla2_param_default(&prm);
   prm.tp_type = tdata->tp_info.transport->key.type;
   pj_strset2(&prm.dst_host, tdata->tp_info.dst_name);
   prm.local_if = PJ_TRUE;

   if ((tdata->tp_info.transport->key.type != PJSIP_TRANSPORT_UDP) &&
      (tdata->tp_info.transport->key.type != PJSIP_TRANSPORT_UDP6)) {
      sel.type = PJSIP_TPSELECTOR_LISTENER;
      sel.u.listener = tdata->tp_info.transport->factory;
      prm.tp_sel = &sel;
   }

   /* If we can't get the local address use best effort and let it pass */
   if (pjsip_tpmgr_find_local_addr2(pjsip_endpt_get_tpmgr(ast_sip_get_pjsip_endpoint()), tdata->pool, &prm) != PJ_SUCCESS) {
      return PJ_SUCCESS;
   }

   /* For UDP we can have multiple transports so the port needs to be maintained */
   if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP ||
      tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
      prm.ret_port = tdata->tp_info.transport->local_name.port;
   }

   /* If the IP source differs from the existing transport see if we need to update it */
   if (pj_strcmp(&prm.ret_addr, &tdata->tp_info.transport->local_name.host)) {

      /* If the transport it is going out on is different reflect it in the message */
      if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP ||
         tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
         pjsip_transport *transport;

         transport = get_udp_transport(&prm.ret_addr, prm.ret_port);

         if (transport) {
            tdata->tp_info.transport = transport;
         }
      }

      /* If the chosen transport is not bound to any we can't use the source address as it won't get back to us */
      if (!is_bound_any(tdata->tp_info.transport)) {
         pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host);
      }
   } else {
      /* The transport chosen will deliver this but ensure it is updated with the right information */
      pj_strassign(&prm.ret_addr, &tdata->tp_info.transport->local_name.host);
   }

   /* If the message needs to be updated with new address do so */
   if (tdata->msg->type == PJSIP_REQUEST_MSG || !(cseq = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CSEQ, NULL)) ||
      pj_strcmp2(&cseq->method.name, "REGISTER")) {
      pjsip_contact_hdr *contact = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_CONTACT, NULL);
      if (contact && (PJSIP_URI_SCHEME_IS_SIP(contact->uri) || PJSIP_URI_SCHEME_IS_SIPS(contact->uri))
         && !(tdata->msg->type == PJSIP_RESPONSE_MSG && tdata->msg->line.status.code / 100 == 3)) {
         pjsip_sip_uri *uri = pjsip_uri_get_uri(contact->uri);

         /* prm.ret_addr is allocated from the tdata pool OR the transport so it is perfectly fine to just do an assignment like this */
         pj_strassign(&uri->host, &prm.ret_addr);
         uri->port = prm.ret_port;
         ast_debug(5, "Re-wrote Contact URI host/port to %.*s:%d (this may be re-written again later)\n",
            (int)pj_strlen(&uri->host), pj_strbuf(&uri->host), uri->port);

         if (tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP ||
            tdata->tp_info.transport->key.type == PJSIP_TRANSPORT_UDP6) {
            uri->transport_param.slen = 0;
         } else {
            pj_strdup2(tdata->pool, &uri->transport_param, pjsip_transport_get_type_name(tdata->tp_info.transport->key.type));
         }

         pjsip_tx_data_invalidate_msg(tdata);
      }
   }

   if (tdata->msg->type == PJSIP_REQUEST_MSG && (via = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_VIA, NULL))) {
      pj_strassign(&via->sent_by.host, &prm.ret_addr);
      via->sent_by.port = prm.ret_port;

      pjsip_tx_data_invalidate_msg(tdata);
   }

   if (tdata->msg->type == PJSIP_REQUEST_MSG && (from = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_FROM, NULL)) &&
      (restrictions && !restrictions->disallow_from_domain_modification)) {
      pjsip_name_addr *id_name_addr = (pjsip_name_addr *)from->uri;
      pjsip_sip_uri *uri = pjsip_uri_get_uri(id_name_addr);
      pj_sockaddr ip;

      if (pj_strcmp2(&uri->host, "localhost") && pj_sockaddr_parse(pj_AF_UNSPEC(), 0, &uri->host, &ip) == PJ_SUCCESS) {
         pj_strassign(&uri->host, &prm.ret_addr);
         pjsip_tx_data_invalidate_msg(tdata);
      }
   }

   /* Update the SDP if it is present */
   if (tdata->msg->body && ast_sip_is_content_type(&tdata->msg->body->content_type, "application", "sdp") &&
      multihomed_rewrite_sdp(tdata->msg->body->data)) {
      struct pjmedia_sdp_session *sdp = tdata->msg->body->data;
      static const pj_str_t STR_IP4 = { "IP4", 3 };
      static const pj_str_t STR_IP6 = { "IP6", 3 };
      pj_str_t STR_IP;
      int stream;

      STR_IP = tdata->tp_info.transport->key.type & PJSIP_TRANSPORT_IPV6 ? STR_IP6 : STR_IP4;

      pj_strassign(&sdp->origin.addr, &prm.ret_addr);
      sdp->origin.addr_type = STR_IP;
      pj_strassign(&sdp->conn->addr, &prm.ret_addr);
      sdp->conn->addr_type = STR_IP;

      for (stream = 0; stream < sdp->media_count; ++stream) {
         if (sdp->media[stream]->conn) {
            pj_strassign(&sdp->media[stream]->conn->addr, &prm.ret_addr);
            sdp->media[stream]->conn->addr_type = STR_IP;
         }
      }

      pjsip_tx_data_invalidate_msg(tdata);
   }

   return PJ_SUCCESS;
}

filter_outgoing_message()

static void filter_outgoing_message ( struct ast_sip_endpoint *  endpoint, struct ast_sip_contact *  contact, struct pjsip_tx_data *  tdata  )

static

Callback invoked on non-session outgoing messages.

Definition at line 72 of file pjsip_message_filter.c.

References ast_strlen_zero, filter_message_restrictions::disallow_from_domain_modification, ast_sip_endpoint::fromdomain, and get_restrictions().

{
   struct filter_message_restrictions *restrictions = get_restrictions(tdata);

   restrictions->disallow_from_domain_modification = !ast_strlen_zero(endpoint->fromdomain);
}

filter_session_outgoing_message()

static void filter_session_outgoing_message ( struct ast_sip_session *  session, struct pjsip_tx_data *  tdata  )

static

Callback invoked on session outgoing messages.

Definition at line 87 of file pjsip_message_filter.c.

References ast_strlen_zero, filter_message_restrictions::disallow_from_domain_modification, ast_sip_session::endpoint, ast_sip_endpoint::fromdomain, and get_restrictions().

{
   struct filter_message_restrictions *restrictions = get_restrictions(tdata);

   restrictions->disallow_from_domain_modification = !ast_strlen_zero(session->endpoint->fromdomain);
}

get_restrictions()

static struct filter_message_restrictions* get_restrictions ( pjsip_tx_data *  tdata )

static

Helper function to get (or allocate if not already present) restrictions on a message.

Definition at line 56 of file pjsip_message_filter.c.

References ast_sip_mod_data_get, ast_sip_mod_data_set, filter_module_tsx, and MOD_DATA_RESTRICTIONS.

Referenced by filter_outgoing_message(), and filter_session_outgoing_message().

{
   struct filter_message_restrictions *restrictions;

   restrictions = ast_sip_mod_data_get(tdata->mod_data, filter_module_tsx.id, MOD_DATA_RESTRICTIONS);
   if (restrictions) {
      return restrictions;
   }

   restrictions = PJ_POOL_ALLOC_T(tdata->pool, struct filter_message_restrictions);
   ast_sip_mod_data_set(tdata->pool, tdata->mod_data, filter_module_tsx.id, MOD_DATA_RESTRICTIONS, restrictions);

   return restrictions;
}

get_udp_transport()

static pjsip_transport* get_udp_transport ( pj_str_t *  address, int  port  )

static

Helper function which returns a UDP transport bound to the given address and port.

Definition at line 102 of file pjsip_message_filter.c.

References ao2_iterator_destroy(), ao2_iterator_init(), ao2_iterator_next, ao2_ref, ast_sip_get_transport_states(), AST_TRANSPORT_UDP, ast_sip_transport_state::flow, NULL, ast_sip_transport_state::transport, transport_states, and ast_sip_transport_state::type.

Referenced by filter_on_tx_message().

{
   struct ao2_container *transport_states = ast_sip_get_transport_states();
   struct ast_sip_transport_state *transport_state;
   struct ao2_iterator iter;
   pjsip_transport *sip_transport = NULL;

   if (!transport_states) {
      return NULL;
   }

   for (iter = ao2_iterator_init(transport_states, 0); (transport_state = ao2_iterator_next(&iter)); ao2_ref(transport_state, -1)) {
      if (!transport_state->flow &&
         transport_state->type == AST_TRANSPORT_UDP &&
         !pj_strcmp(&transport_state->transport->local_name.host, address) &&
         transport_state->transport->local_name.port == port) {
         sip_transport = transport_state->transport;
         ao2_ref(transport_state, -1);
         break;
      }
   }
   ao2_iterator_destroy(&iter);

   ao2_ref(transport_states, -1);

   return sip_transport;
}

is_bound_any()

static int is_bound_any ( pjsip_transport *  transport )

static

Helper function which determines if a transport is bound to any.

Definition at line 131 of file pjsip_message_filter.c.

Referenced by filter_on_tx_message().

{
   pj_uint32_t loop6[4] = {0, 0, 0, 0};

   if ((transport->local_addr.addr.sa_family == pj_AF_INET() &&
      transport->local_addr.ipv4.sin_addr.s_addr == PJ_INADDR_ANY) ||
      (transport->local_addr.addr.sa_family == pj_AF_INET6() &&
      !pj_memcmp(&transport->local_addr.ipv6.sin6_addr, loop6, sizeof(loop6)))) {
      return 1;
   }

   return 0;
}

multihomed_rewrite_sdp()

static int multihomed_rewrite_sdp ( struct pjmedia_sdp_session *  sdp )

static

Helper function which determines if the address within SDP should be rewritten.

Definition at line 146 of file pjsip_message_filter.c.

References ast_sip_get_host_ip_string().

Referenced by filter_on_tx_message().

{
   if (!sdp->conn) {
      return 0;
   }

   /* If the host address is used in the SDP replace it with the address of what this is going out on */
   if ((!pj_strcmp2(&sdp->conn->addr_type, "IP4") && !pj_strcmp2(&sdp->conn->addr,
      ast_sip_get_host_ip_string(pj_AF_INET()))) ||
      (!pj_strcmp2(&sdp->conn->addr_type, "IP6") && !pj_strcmp2(&sdp->conn->addr,
      ast_sip_get_host_ip_string(pj_AF_INET6())))) {
      return 1;
   }

   return 0;
}

on_rx_process_symmetric_transport()

static pj_bool_t on_rx_process_symmetric_transport ( pjsip_rx_data *  rdata )

static

Definition at line 505 of file pjsip_message_filter.c.

References ao2_cleanup, ast_begins_with(), ast_debug, ast_sip_get_sorcery(), AST_SIP_X_AST_TXP, AST_SIP_X_AST_TXP_LEN, ast_sorcery_retrieve_by_id(), NULL, and ast_sip_transport::symmetric_transport.

Referenced by filter_on_rx_message().

{
   pjsip_contact_hdr *contact;
   pjsip_sip_uri *uri;
   const char *transport_id;
   struct ast_sip_transport *transport;
   pjsip_param *x_transport;

   if (rdata->msg_info.msg->type != PJSIP_REQUEST_MSG) {
      return PJ_FALSE;
   }

   contact = pjsip_msg_find_hdr(rdata->msg_info.msg, PJSIP_H_CONTACT, NULL);
   if (!(contact && contact->uri
      && ast_begins_with(rdata->tp_info.transport->info, AST_SIP_X_AST_TXP ":"))) {
      return PJ_FALSE;
   }

   uri = pjsip_uri_get_uri(contact->uri);

   transport_id = rdata->tp_info.transport->info + AST_SIP_X_AST_TXP_LEN + 1;
   transport = ast_sorcery_retrieve_by_id(ast_sip_get_sorcery(), "transport", transport_id);

   if (!(transport && transport->symmetric_transport)) {
      ao2_cleanup(transport);
      return PJ_FALSE;
   }
   ao2_cleanup(transport);

   x_transport = PJ_POOL_ALLOC_T(rdata->tp_info.pool, pjsip_param);
   x_transport->name = pj_strdup3(rdata->tp_info.pool, AST_SIP_X_AST_TXP);
   x_transport->value = pj_strdup3(rdata->tp_info.pool, transport_id);

   pj_list_insert_before(&uri->other_param, x_transport);

   ast_debug(1, "Set transport '%s' on %.*s from %.*s:%d\n", transport_id,
      (int)rdata->msg_info.msg->line.req.method.name.slen,
      rdata->msg_info.msg->line.req.method.name.ptr,
      (int)uri->host.slen, uri->host.ptr, uri->port);

   return PJ_FALSE;
}

on_rx_process_uris()

static pj_bool_t on_rx_process_uris ( pjsip_rx_data *  rdata )

static

Definition at line 446 of file pjsip_message_filter.c.

References ast_sip_get_pjsip_endpoint(), is_sip_uri, NULL, print_uri_debug(), remove_x_ast_params(), URI_TYPE_CONTACT, URI_TYPE_FROM, URI_TYPE_REQUEST, and URI_TYPE_TO.

Referenced by filter_on_rx_message().

{
   pjsip_contact_hdr *contact = NULL;

   if (rdata->msg_info.msg->type != PJSIP_REQUEST_MSG) {
      return PJ_FALSE;
   }

   if (!is_sip_uri(rdata->msg_info.msg->line.req.uri)) {
      print_uri_debug(URI_TYPE_REQUEST, rdata, NULL);
      pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata,
         PJSIP_SC_UNSUPPORTED_URI_SCHEME, NULL, NULL, NULL);
      return PJ_TRUE;
   }
   remove_x_ast_params(rdata->msg_info.msg->line.req.uri);

   if (!is_sip_uri(rdata->msg_info.from->uri)) {
      print_uri_debug(URI_TYPE_FROM, rdata, (pjsip_hdr *)rdata->msg_info.from);
      pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata,
         PJSIP_SC_UNSUPPORTED_URI_SCHEME, NULL, NULL, NULL);
      return PJ_TRUE;
   }
   remove_x_ast_params(rdata->msg_info.from->uri);

   if (!is_sip_uri(rdata->msg_info.to->uri)) {
      print_uri_debug(URI_TYPE_TO, rdata, (pjsip_hdr *)rdata->msg_info.to);
      pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata,
         PJSIP_SC_UNSUPPORTED_URI_SCHEME, NULL, NULL, NULL);
      return PJ_TRUE;
   }
   remove_x_ast_params(rdata->msg_info.to->uri);

   contact = (pjsip_contact_hdr *) pjsip_msg_find_hdr(
      rdata->msg_info.msg, PJSIP_H_CONTACT, NULL);

   if (!contact && pjsip_method_creates_dialog(&rdata->msg_info.msg->line.req.method)) {
      /* A contact header is required for dialog creating methods */
      static const pj_str_t missing_contact = { "Missing Contact header", 22 };
      pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 400,
            &missing_contact, NULL, NULL);
      return PJ_TRUE;
   }

   while (contact) {
      if (!contact->star && !is_sip_uri(contact->uri)) {
         print_uri_debug(URI_TYPE_CONTACT, rdata, (pjsip_hdr *)contact);
         pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata,
            PJSIP_SC_UNSUPPORTED_URI_SCHEME, NULL, NULL, NULL);
         return PJ_TRUE;
      }
      remove_x_ast_params(contact->uri);

      contact = (pjsip_contact_hdr *) pjsip_msg_find_hdr(
         rdata->msg_info.msg, PJSIP_H_CONTACT, contact->next);
   }

   return PJ_FALSE;
}

print_sanitize_debug()

static void print_sanitize_debug ( char *  msg, pjsip_uri_context_e  context, pjsip_sip_uri *  uri  )

static

Definition at line 166 of file pjsip_message_filter.c.

References ast_debug.

Referenced by sanitize_tdata().

{
#ifdef AST_DEVMODE
   char hdrbuf[512];
   int hdrbuf_len;

   hdrbuf_len = pjsip_uri_print(context, uri, hdrbuf, 512);
   hdrbuf[hdrbuf_len] = '\0';
   ast_debug(2, "%s: %s\n", msg, hdrbuf);
#endif
}

print_uri_debug()

static void print_uri_debug ( enum uri_type  ut, pjsip_rx_data *  rdata, pjsip_hdr *  hdr  )

static

Definition at line 365 of file pjsip_message_filter.c.

References ast_debug, ast_strdupa, context, NULL, and URI_TYPE_REQUEST.

Referenced by on_rx_process_uris().

{
#ifdef AST_DEVMODE
   pjsip_uri *local_uri = NULL;
   char hdrbuf[512];
   int hdrbuf_len;
   char *request_uri;
   pjsip_uri_context_e context = PJSIP_URI_IN_OTHER;
   char header_name[32];

   switch (ut) {
   case(URI_TYPE_REQUEST):
      context = PJSIP_URI_IN_REQ_URI;
      strcpy(header_name, "Request"); /* Safe */
      local_uri = rdata->msg_info.msg->line.req.uri;
      break;
   case(PJSIP_H_FROM):
      strcpy(header_name, "From"); /* Safe */
      context = PJSIP_URI_IN_FROMTO_HDR;
      local_uri = pjsip_uri_get_uri(((pjsip_from_hdr *)hdr)->uri);
      break;
   case(PJSIP_H_TO):
      strcpy(header_name, "To"); /* Safe */
      context = PJSIP_URI_IN_FROMTO_HDR;
      local_uri = pjsip_uri_get_uri(((pjsip_to_hdr *)hdr)->uri);
      break;
   case(PJSIP_H_CONTACT):
      strcpy(header_name, "Contact"); /* Safe */
      context = PJSIP_URI_IN_CONTACT_HDR;
      local_uri = pjsip_uri_get_uri(((pjsip_contact_hdr *)hdr)->uri);
      break;
   }

   hdrbuf_len = pjsip_uri_print(PJSIP_URI_IN_REQ_URI, rdata->msg_info.msg->line.req.uri, hdrbuf, 512);
   hdrbuf[hdrbuf_len] = '\0';
   request_uri = ast_strdupa(hdrbuf);
   hdrbuf_len = pjsip_uri_print(context, local_uri, hdrbuf, 512);
   hdrbuf[hdrbuf_len] = '\0';

   ast_debug(2, "There was a non sip(s) URI scheme in %s URI '%s' for request '%*.*s %s'\n",
      header_name, hdrbuf,
      (int)rdata->msg_info.msg->line.req.method.name.slen,
      (int)rdata->msg_info.msg->line.req.method.name.slen,
      rdata->msg_info.msg->line.req.method.name.ptr, request_uri);
#endif
}

remove_x_ast_params()

static void remove_x_ast_params ( pjsip_uri *  header_uri )

static

/internal

We want to make sure that any incoming requests don't already have x-ast-* parameters in any URIs or we may get confused if symmetric transport (x-ast-txp) or rewrite_contact (x-ast-orig-host) is used later on.

Definition at line 420 of file pjsip_message_filter.c.

Referenced by on_rx_process_uris().

                                                      {
   pjsip_sip_uri *uri;
   pjsip_param *param;

   if (!header_uri) {
      return;
   }

   uri = pjsip_uri_get_uri(header_uri);
   if (!uri) {
      return;
   }

   param = uri->other_param.next;

   while (param != &uri->other_param) {
      /* We need to save off 'next' because pj_list_erase will remove it */
      pjsip_param *next = param->next;

      if (pj_strncmp2(&param->name, "x-ast-", 6) == 0) {
         pj_list_erase(param);
      }
      param = next;
   }
}

sanitize_tdata()

static void FUNC_ATTRS sanitize_tdata ( pjsip_tx_data *  tdata )

static

Definition at line 185 of file pjsip_message_filter.c.

References AST_SIP_X_AST_TXP, AST_SIP_X_AST_TXP_LEN, is_sip_uri, and print_sanitize_debug().

Referenced by filter_on_tx_message().

{
   static const pj_str_t x_name = { AST_SIP_X_AST_TXP, AST_SIP_X_AST_TXP_LEN };
   pjsip_param *x_transport;
   pjsip_sip_uri *uri;
   pjsip_hdr *hdr;

   if (tdata->msg->type == PJSIP_REQUEST_MSG) {
      if (is_sip_uri(tdata->msg->line.req.uri)) {
         uri = pjsip_uri_get_uri(tdata->msg->line.req.uri);
         print_sanitize_debug("Sanitizing Request", PJSIP_URI_IN_REQ_URI, uri);
         while ((x_transport = pjsip_param_find(&uri->other_param, &x_name))) {
            pj_list_erase(x_transport);
         }
      }
   }

   for (hdr = tdata->msg->hdr.next; hdr != &tdata->msg->hdr; hdr = hdr->next) {
      if (hdr->type == PJSIP_H_TO || hdr->type == PJSIP_H_FROM) {
         if (is_sip_uri(((pjsip_fromto_hdr *) hdr)->uri)) {
            uri = pjsip_uri_get_uri(((pjsip_fromto_hdr *) hdr)->uri);
            print_sanitize_debug("Sanitizing From/To header", PJSIP_URI_IN_FROMTO_HDR, uri);
            while ((x_transport = pjsip_param_find(&uri->other_param, &x_name))) {
               pj_list_erase(x_transport);
            }
         }
      } else if (hdr->type == PJSIP_H_CONTACT) {
         if (!((pjsip_contact_hdr *) hdr)->star && is_sip_uri(((pjsip_contact_hdr *) hdr)->uri)) {
            uri = pjsip_uri_get_uri(((pjsip_contact_hdr *) hdr)->uri);
            print_sanitize_debug("Sanitizing Contact header", PJSIP_URI_IN_CONTACT_HDR, uri);
            while ((x_transport = pjsip_param_find(&uri->other_param, &x_name))) {
               pj_list_erase(x_transport);
            }
         }
      }
   }

   pjsip_tx_data_invalidate_msg(tdata);
}

Variable Documentation

filter_module_transport

pjsip_module filter_module_transport

static

Definition at line 40 of file pjsip_message_filter.c.

Referenced by ast_res_pjsip_cleanup_message_filter(), ast_res_pjsip_init_message_filter(), and filter_on_tx_message().

filter_module_tsx

pjsip_module filter_module_tsx

static

Definition at line 47 of file pjsip_message_filter.c.

Referenced by ast_res_pjsip_cleanup_message_filter(), ast_res_pjsip_init_message_filter(), and get_restrictions().

filter_session_supplement

struct ast_sip_session_supplement filter_session_supplement

static

Initial value:

= {
   .priority = 1,
   .outgoing_request = filter_session_outgoing_message,
   .outgoing_response = filter_session_outgoing_message,
}

PJSIP Session Supplement for tagging messages with restrictions.

Definition at line 95 of file pjsip_message_filter.c.

filter_supplement

struct ast_sip_supplement filter_supplement

static

Initial value:

= {
   .priority = AST_SIP_SUPPLEMENT_PRIORITY_FIRST,
   .outgoing_request = filter_outgoing_message,
   .outgoing_response = filter_outgoing_message,
}

PJSIP Supplement for tagging messages with restrictions.

Definition at line 80 of file pjsip_message_filter.c.