prime_hash.c File Reference

Functions for determinung a pseudo random number over a message's header field, based on CRC32 or a prime number algorithm. More...

#include "../../sr_module.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parse_to.h"
#include "../../parser/parse_from.h"
#include "../../crc.h"
#include <ctype.h>
#include "prime_hash.h"

Include dependency graph for prime_hash.c:

Go to the source code of this file.

Functions
static int	determine_call_id (struct sip_msg *msg, str *source_string)
static int	determine_fromto_uri (struct to_body *fromto, str *source_string)
static int	determine_fromto_user (struct to_body *fromto, str *source_string)
static int	determine_source (struct sip_msg *msg, enum hash_source source, str *source_string)
static int	first_token (str *source_string)
int	hash_func (struct sip_msg *msg, enum hash_source source, int denominator)
	CRC32 hash function Returns an integer number between 0 and denominator - 1 based on the hash source from the msg. The hash algorith is CRC32.
int	prime_hash_func (struct sip_msg *msg, enum hash_source source, int denominator)
	prime hash function Returns an integer number between 0 and denominator - 1 based on the hash source from the msg. Use the prime number algorithm.
static int	validate_msg (struct sip_msg *msg)

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Detailed Description

Functions for determinung a pseudo random number over a message's header field, based on CRC32 or a prime number algorithm.

Definition in file prime_hash.c.

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Function Documentation

static int determine_call_id	(	struct sip_msg *	msg,
		str *	source_string
	)			[static]

Definition at line 160 of file prime_hash.c.

References hdr_field::body, sip_msg::callid, first_token(), _str::len, and _str::s.

Referenced by determine_source().

static int determine_fromto_uri	(	struct to_body *	fromto,
		str *	source_string
	)			[static]

Definition at line 167 of file prime_hash.c.

References _str::len, LM_ERR, NULL, _str::s, and to_body::uri.

Referenced by determine_source().

static int determine_fromto_user	(	struct to_body *	fromto,
		str *	source_string
	)			[static]

Definition at line 177 of file prime_hash.c.

References _str::len, LM_ERR, NULL, parse_uri(), _str::s, to_body::uri, and sip_uri::user.

Referenced by determine_source().

static int determine_source	(	struct sip_msg *	msg,
		enum hash_source	source,
		str *	source_string
	)			[static]

Definition at line 111 of file prime_hash.c.

References determine_call_id(), determine_fromto_uri(), determine_fromto_user(), get_from, get_to, _str::len, LM_ERR, NULL, _str::s, shs_call_id, shs_from_uri, shs_from_user, shs_to_uri, shs_to_user, and validate_msg().

Referenced by hash_func(), and prime_hash_func().

static int first_token

(

str *

source_string

)

[static]

Definition at line 193 of file prime_hash.c.

References _str::len, len, NULL, and _str::s.

Referenced by determine_call_id().

int hash_func	(	struct sip_msg *	msg,
		enum hash_source	source,
		int	denominator
	)

CRC32 hash function Returns an integer number between 0 and denominator - 1 based on the hash source from the msg. The hash algorith is CRC32.

Definition at line 50 of file prime_hash.c.

References crc32_uint(), determine_source(), hash, and LM_DBG.

Referenced by rewrite_on_rule().

int prime_hash_func	(	struct sip_msg *	msg,
		enum hash_source	source,
		int	denominator
	)

prime hash function Returns an integer number between 0 and denominator - 1 based on the hash source from the msg. Use the prime number algorithm.

Definition at line 66 of file prime_hash.c.

References determine_source(), _str::len, LM_DBG, LM_ERR, _str::s, shs_from_user, and shs_to_user.

Referenced by rewrite_on_rule().

static int validate_msg

(

struct sip_msg *

msg

)

[static]

Definition at line 138 of file prime_hash.c.

References sip_msg::callid, sip_msg::from, HDR_CALLID_F, HDR_FROM_F, HDR_TO_F, LM_ERR, parse_from_header(), parse_headers(), and sip_msg::to.

Referenced by determine_source().