/* The oSIP library implements the Session Initiation Protocol (SIP -rfc3261-) Copyright (C) 2001,2002,2003,2004,2005 Aymeric MOIZARD jack@atosc.org 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include "parser.h" static __osip_message_config_t pconfig[NUMBER_OF_HEADERS]; /* The size of the hash table seems large for a limited number of possible entries * The 'problem' is that the header name are too much alike for the osip_hash() function * which gives a poor deviation. * Anyway, this mechanism improves the search time (from binary seach (log(n)) to 1). */ #ifndef HASH_TABLE_SIZE #ifdef __amd64__ #define HASH_TABLE_SIZE 150 #else #define HASH_TABLE_SIZE 150 /* set this to the hash table size, 150 is the first size where no conflicts occur */ #endif static int hdr_ref_table[HASH_TABLE_SIZE]; /* the hashtable contains indices to the pconfig table */ /* list of compact header: i: Call-ID => ok m: Contact => ok e: Content-Encoding => ok l: Content-Length => ok c: Content-Type => ok f: From => ok s: Subject => NOT A SUPPORTED HEADER! will be available in the list of unknown headers t: To => ok v: Via => ok */ /* This method must be called before using the parser */ int parser_init (void) { int i = 0; pconfig[i].hname = ACCEPT; pconfig[i++].setheader = (&osip_message_set_accept); pconfig[i].hname = ACCEPT_ENCODING; pconfig[i++].setheader = (&osip_message_set_accept_encoding); pconfig[i].hname = ACCEPT_LANGUAGE; pconfig[i++].setheader = (&osip_message_set_accept_language); pconfig[i].hname = ALERT_INFO; pconfig[i++].setheader = (&osip_message_set_alert_info); pconfig[i].hname = ALLOW; pconfig[i++].setheader = (&osip_message_set_allow); pconfig[i].hname = AUTHENTICATION_INFO; pconfig[i++].setheader = (&osip_message_set_authentication_info); pconfig[i].hname = AUTHORIZATION; pconfig[i++].setheader = (&osip_message_set_authorization); pconfig[i].hname = CONTENT_TYPE_SHORT; /* "l" */ pconfig[i++].setheader = (&osip_message_set_content_type); pconfig[i].hname = CALL_ID; pconfig[i++].setheader = (&osip_message_set_call_id); pconfig[i].hname = CALL_INFO; pconfig[i++].setheader = (&osip_message_set_call_info); pconfig[i].hname = CONTACT; pconfig[i++].setheader = (&osip_message_set_contact); pconfig[i].hname = CONTENT_ENCODING; pconfig[i++].setheader = (&osip_message_set_content_encoding); pconfig[i].hname = CONTENT_LENGTH; pconfig[i++].setheader = (&osip_message_set_content_length); pconfig[i].hname = CONTENT_TYPE; pconfig[i++].setheader = (&osip_message_set_content_type); pconfig[i].hname = CSEQ; pconfig[i++].setheader = (&osip_message_set_cseq); pconfig[i].hname = CONTENT_ENCODING_SHORT; /* "e" */ pconfig[i++].setheader = (&osip_message_set_content_encoding); pconfig[i].hname = ERROR_INFO; pconfig[i++].setheader = (&osip_message_set_error_info); pconfig[i].hname = FROM_SHORT; /* "f" */ pconfig[i++].setheader = (&osip_message_set_from); pconfig[i].hname = FROM; pconfig[i++].setheader = (&osip_message_set_from); pconfig[i].hname = CALL_ID_SHORT; /* "i" */ pconfig[i++].setheader = (&osip_message_set_call_id); pconfig[i].hname = CONTENT_LENGTH_SHORT; /* "l" */ pconfig[i++].setheader = (&osip_message_set_content_length); pconfig[i].hname = CONTACT_SHORT; /* "m" */ pconfig[i++].setheader = (&osip_message_set_contact); pconfig[i].hname = MIME_VERSION; pconfig[i++].setheader = (&osip_message_set_mime_version); pconfig[i].hname = PROXY_AUTHENTICATE; pconfig[i++].setheader = (&osip_message_set_proxy_authenticate); pconfig[i].hname = PROXY_AUTHENTICATION_INFO; pconfig[i++].setheader = (&osip_message_set_proxy_authentication_info); pconfig[i].hname = PROXY_AUTHORIZATION; pconfig[i++].setheader = (&osip_message_set_proxy_authorization); pconfig[i].hname = RECORD_ROUTE; pconfig[i++].setheader = (&osip_message_set_record_route); pconfig[i].hname = ROUTE; pconfig[i++].setheader = (&osip_message_set_route); pconfig[i].hname = TO_SHORT; pconfig[i++].setheader = (&osip_message_set_to); pconfig[i].hname = TO; pconfig[i++].setheader = (&osip_message_set_to); pconfig[i].hname = VIA_SHORT; pconfig[i++].setheader = (&osip_message_set_via); pconfig[i].hname = VIA; pconfig[i++].setheader = (&osip_message_set_via); pconfig[i].hname = WWW_AUTHENTICATE; pconfig[i++].setheader = (&osip_message_set_www_authenticate); /* build up hash table for fast header lookup */ /* initialize the table */ for (i = 0; i < HASH_TABLE_SIZE; i++) { hdr_ref_table[i] = -1; /* -1 -> no entry */ } for (i = 0; i < NUMBER_OF_HEADERS; i++) { unsigned int hash; /* calculate hash value using lower case */ /* Fixed: do not lower constant... osip_tolower( pconfig[i].hname ); */ hash = osip_hash (pconfig[i].hname); hash = hash % HASH_TABLE_SIZE; if (hdr_ref_table[hash] == -1) { /* store reference(index) to pconfig table */ hdr_ref_table[hash] = i; } else { /* oops, conflict!-> change the hash table or use another hash function size */ OSIP_TRACE (osip_trace (__FILE__, __LINE__, OSIP_ERROR, NULL, "conflict with current hashtable size\n")); return -1; } } return 0; } /* improved look-up mechanism precondition: hname is all lowercase */ int __osip_message_is_known_header (const char *hname) { unsigned int hash; int result = -1; int index; hash = osip_hash (hname); hash = hash % HASH_TABLE_SIZE; index = hdr_ref_table[hash]; if ((index != -1) && (0 == osip_strcasecmp (pconfig[index].hname, hname))) { result = index; } return result; } #endif /* This method calls the method that is able to parse the header */ int __osip_message_call_method (int i, osip_message_t * dest, const char *hvalue) { return pconfig[i].setheader (dest, hvalue); }