sip_msg_t *
sip_load_message(const char *header, const char *payload)
{
sip_msg_t *msg;
sip_call_t *call;
char *callid;
// Get the Call-ID of this message
if (!(callid = sip_get_callid(payload))) {
return NULL;
}
// Create a new message from this data
if (!(msg = sip_msg_create(header, payload))) {
return NULL;
}
// Find the call for this msg
if (!(call = call_find_by_callid(callid))) {
// Create the call if not found
if (!(call = sip_call_create(callid))) {
//@todo sip_msg_destroy();
return NULL;
}
}
// Set message callid
msg_set_attribute(msg, SIP_ATTR_CALLID, callid);
// Add the message to the found/created call
call_add_message(call, msg);
// Return the loaded message
return msg;
}
/*
* Validate some of the common headers
*/
boolean_t
sip_check_common_headers(sip_conn_object_t conn_obj, _sip_msg_t *sip_msg)
{
int err;
if (sip_get_to_uri_str((sip_msg_t)sip_msg, &err) == NULL)
goto error;
if (sip_get_from_uri_str((sip_msg_t)sip_msg, &err) == NULL)
goto error;
if (sip_get_callseq_num((sip_msg_t)sip_msg, &err) < 0)
goto error;
if (sip_get_callid((sip_msg_t)sip_msg, &err) == NULL)
goto error;
return (B_FALSE);
error:
sip_send_resp(conn_obj, sip_msg, SIP_BAD_REQUEST);
return (B_TRUE);
}
sip_msg_t *
sip_check_packet(packet_t *packet)
{
sip_msg_t *msg;
sip_call_t *call;
char callid[1024], xcallid[1024];
address_t src, dst;
u_char payload[MAX_SIP_PAYLOAD];
bool newcall = false;
// Max SIP payload allowed
if (packet->payload_len > MAX_SIP_PAYLOAD)
return NULL;
// Get Addresses from packet
src = packet->src;
dst = packet->dst;
// Initialize local variables
memset(callid, 0, sizeof(callid));
memset(xcallid, 0, sizeof(xcallid));
// Get payload from packet(s)
memset(payload, 0, MAX_SIP_PAYLOAD);
memcpy(payload, packet_payload(packet), packet_payloadlen(packet));
// Get the Call-ID of this message
if (!sip_get_callid((const char*) payload, callid))
return NULL;
// Create a new message from this data
if (!(msg = msg_create((const char*) payload)))
return NULL;
// Get Method and request for the following checks
// There is no need to parse all payload at this point
// If no response or request code is found, this is not a SIP message
if (!sip_get_msg_reqresp(msg, payload)) {
// Deallocate message memory
msg_destroy(msg);
return NULL;
}
// Find the call for this msg
if (!(call = sip_find_by_callid(callid))) {
// Check if payload matches expression
if (!sip_check_match_expression((const char*) payload))
goto skip_message;
// User requested only INVITE starting dialogs
if (calls.only_calls && msg->reqresp != SIP_METHOD_INVITE)
goto skip_message;
// Only create a new call if the first msg
// is a request message in the following gorup
if (calls.ignore_incomplete && msg->reqresp > SIP_METHOD_MESSAGE)
goto skip_message;
// Get the Call-ID of this message
sip_get_xcallid((const char*) payload, xcallid);
// Rotate call list if limit has been reached
if (calls.limit == sip_calls_count())
sip_calls_rotate();
// Create the call if not found
if (!(call = call_create(callid, xcallid)))
goto skip_message;
// Add this Call-Id to hash table
htable_insert(calls.callids, call->callid, call);
// Set call index
call->index = ++calls.last_index;
// Mark this as a new call
newcall = true;
}
// At this point we know we're handling an interesting SIP Packet
msg->packet = packet;
// Always parse first call message
if (call_msg_count(call) == 0) {
// Parse SIP payload
sip_parse_msg_payload(msg, payload);
// If this call has X-Call-Id, append it to the parent call
if (strlen(call->xcallid)) {
call_add_xcall(sip_find_by_callid(call->xcallid), call);
}
}
// Add the message to the call
call_add_message(call, msg);
if (call_is_invite(call)) {
// Parse media data
sip_parse_msg_media(msg, payload);
// Update Call State
call_update_state(call, msg);
// Check if this call should be in active call list
if (call_is_active(call)) {
if (sip_call_is_active(call)) {
vector_append(calls.active, call);
}
} else {
if (sip_call_is_active(call)) {
vector_remove(calls.active, call);
}
}
}
if (newcall) {
// Append this call to the call list
vector_append(calls.list, call);
}
// Mark the list as changed
calls.changed = true;
// Return the loaded message
return msg;
skip_message:
// Deallocate message memory
msg_destroy(msg);
return NULL;
}
