Structure sip_msg

struct sip_msg {
    unsigned int id;               /* message id, unique/process*/
    struct msg_start first_line;   /* Message first line */
    struct via_body* via1;         /* The first via */
    struct via_body* via2;         /* The second via */
    struct hdr_field* headers;     /* All the parsed headers*/
    struct hdr_field* last_header; /* Pointer to the last parsed header*/
    int parsed_flag;               /* Already parsed header field types */

    /* Via, To, CSeq, Call-Id, From, end of header*/
    /* first occurance of it; subsequent occurances 
     * saved in 'headers' 
     */

    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;
    struct hdr_field* maxforwards;
    struct hdr_field* route;
    struct hdr_field* record_route;
    struct hdr_field* content_type;
    struct hdr_field* content_length;
    struct hdr_field* authorization;
    struct hdr_field* expires;
    struct hdr_field* proxy_auth;
    struct hdr_field* www_auth;
    struct hdr_field* supported;
    struct hdr_field* require;
    struct hdr_field* proxy_require;
    struct hdr_field* unsupported;
    struct hdr_field* allow;
    struct hdr_field* event;

    char* eoh;        /* pointer to the end of header (if found) or null */
    char* unparsed;   /* here we stopped parsing*/

    struct ip_addr src_ip;
    struct ip_addr 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*/
    int parsed_uri_ok;         /* 1 if parsed_uri is valid, 0 if not */
    struct sip_uri parsed_uri; /* speed-up > keep here the parsed uri*/
		
    struct lump* add_rm;         /* used for all the forwarded 
                                  * requests */
    struct lump* repl_add_rm;    /* used for all the forwarded replies */
    struct lump_rpl *reply_lump; /* only for localy generated replies !!!*/

    char add_to_branch_s[MAX_BRANCH_PARAM_LEN];
    int add_to_branch_len;
		
    /* index to TM hash table; stored in core to avoid unnecessary calcs */
    unsigned int  hash_index;
		
    /* allows to set various flags on the message; may be used for 
     * simple inter-module communication or remembering processing state
     * reached 
     */
    flag_t flags;	
};