/*
  * $Id$
  */
 
 #ifndef msg_parser_h
 #define msg_parser_h
 

 #include "str.h"

 #include "data_lump.h"
 

 #define SIP_REQUEST 1
 #define SIP_REPLY   2
 #define SIP_INVALID 0
 
 

 
 /*header types and flags*/
 #define HDR_EOH           -1
 #define HDR_ERROR          0
 #define HDR_VIA            1
 #define HDR_VIA1           1
 #define HDR_VIA2           2  /*only used as flag*/
 #define HDR_TO             4
 #define HDR_FROM           8
 #define HDR_CSEQ          16
 #define HDR_CALLID        32
 #define HDR_CONTACT       64
 #define HDR_MAXFORWARDS  128
 #define HDR_ROUTE        256
 #define HDR_OTHER       65536 /*unknown header type*/

 #define INVITE_LEN	6
 #define ACK_LEN		3
 #define CANCEL_LEN	6
 #define BYE_LEN		3
 enum { METHOD_OTHER, METHOD_INVITE, METHOD_CANCEL, METHOD_ACK, METHOD_BYE };
 
 #define IFISMETHOD(methodname,firstchar)                                  \
 if (  (*tmp==(firstchar) || *tmp==((firstchar) | 32)) &&                  \
         strncasecmp( tmp+1, #methodname +1, methodname##_LEN-1)==0 &&     \
         *(tmp+methodname##_LEN)==' ') {                                   \
                 fl->type=SIP_REQUEST;                                     \
                 fl->u.request.method.len=methodname##_LEN;                \
                 fl->u.request.method_value=METHOD_##methodname;           \
                 tmp=buffer+methodname##_LEN;                              \
 }

 
 #define VIA_PARSE_OK	1
 #define VIA_PARSE_ERROR -1

 #define PARSE_ERROR -1
 #define PARSE_OK 1

 
 #define SIP_VERSION	"SIP/2.0"

 #define SIP_VERSION_LEN 7

 
 
 struct msg_start{
 	int type;
 	union {
 		struct {

 			str method;
 			str uri;
 			str version;

 			short method_value;

 		}request;
 		struct {

 			str version;
 			str status;
 			str reason;

 			unsigned short statusclass, statuscode;

 		}reply;
 	}u;
 };
 
 struct hdr_field{   /* format: name':' body */
 	int type;

 	str name;
 	str body;
 	void* parsed;

 	struct hdr_field* next;

 };
 
 struct via_body{  /* format: name/version/transport host:port;params comment */
 	int error;

 	str hdr;   /* contains "Via" or "v" */
 	str name;
 	str version;
 	str transport;
 	str host;

 	int port;

 	str port_str;
 	str params;
 	str comment;

 	int bsize;    /* body size, not including hdr */
 	struct via_body* next; /* pointer to next via body string if
 							  compact via or null */

 };
 

 
 
 struct cseq_body{
 	int error;
 	str number;
 	str method;
 };
 
 
 

 struct sip_msg{

 	unsigned int id; /* message id, unique/process*/

 	struct msg_start first_line;

 	struct via_body* via1;
 	struct via_body* via2;
 	struct hdr_field* headers; /* all the parsed headers*/
 	struct hdr_field* last_header; /* pointer to the last parsed header*/
 	int parsed_flag;
 	/* via, to, cseq, call-id, from, end of header*/
 	struct hdr_field* h_via1;
 	struct hdr_field* h_via2;
 	struct hdr_field* callid;
 	struct hdr_field* to;
 	struct hdr_field* cseq;
 	struct hdr_field* from;
 	struct hdr_field* contact;
 	char* eoh; /* pointer to the end of header (if found) or null */
 
 	char* unparsed; /* here we stopped parsing*/

 	unsigned int src_ip;
 	unsigned int dst_ip;

 	char* orig; /* original message copy */
 	char* buf;  /* scratch pad, holds a modfied message,
 				   via, etc. point into it */
 				   
 	unsigned int len; /* message len (orig) */

 
 	/* modifications */

 	str new_uri; /* changed first line uri*/

 
 	struct lump* add_rm;      /* used for all the forwarded messages */
 	struct lump* repl_add_rm; /* only for localy generated replies !!!*/

 };
 

 struct sip_uri{

 	str user;
 	str passwd;
 	str host;
 	str port;
 	str params;
 	str headers;

 };
 
 

 
 char* parse_first_line(char* buffer, unsigned int len, struct msg_start * fl);

 #ifdef OLD_PARSER 

 char* get_hdr_field(char *buffer, unsigned int len, struct hdr_field*  hdr_f);

 int field_name(char *s, int len);
 #endif
 char* parse_hostport(char* buf, str* host, short int* port);
 
 #ifdef OLD_PARSER 

 char* parse_via_body(char* buffer,unsigned int len, struct via_body * vb);

 #endif

 int parse_msg(char* buf, unsigned int len, struct sip_msg* msg);

 int parse_uri(char *buf, int len, struct sip_uri* uri);

 int parse_headers(struct sip_msg* msg, int flags);
 

 void free_uri(struct sip_uri* u);

 #ifndef OLD_PARSER
 char* parse_hname(char* buf, char* end, struct hdr_field* hdr);
 char* parse_via(char* buffer, char* end, struct via_body *vb);

 char* parse_cseq(char* buffer, char* end, struct cseq_body *cb);

 #endif
 

 void free_via_list(struct via_body *vb);
 void clean_hdr_field(struct hdr_field* hf);
 void free_hdr_field_lst(struct hdr_field* hf);
 

 
 #endif