prime_hash.h 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 "../../parser/msg_parser.h"

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Defines
#define	PRIME_HASH_H   1
Typedefs
typedef int(*	hash_func_t )(struct sip_msg *msg, enum hash_source source, int denominator)
Enumerations
enum	hash_source {   shs_call_id = 1, shs_from_uri, shs_from_user, shs_to_uri,   shs_to_user, shs_error }
	Determines from which part of a message the hash shall be calculated. Possible values are:. More...
Functions
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.

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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.h.

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Define Documentation

#define PRIME_HASH_H   1

Definition at line 33 of file prime_hash.h.

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Typedef Documentation

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

generic interface for hash functions

Definition at line 60 of file prime_hash.h.

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Enumeration Type Documentation

enum hash_source

Determines from which part of a message the hash shall be calculated. Possible values are:.

• shs_call_id the content of the Call-ID header field
• shs_from_uri the entire URI in the From header field
• shs_from_user the username part of the URI in the From header field
• shs_to_uri the entire URI in the To header field
• shs_to_user the username part of the URI in the To header field
• shs_error no hash specified

Enumerator:

shs_call_id
shs_from_uri
shs_from_user
shs_to_uri
shs_to_user
shs_error

Definition at line 50 of file prime_hash.h.

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Function Documentation

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().