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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Typedefs

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

  generic interface for hash functions
  

Enumerations

• enum hash_source

  Determines from which part of a message the hash shall be calculated.

  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.
  

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Detailed Description

Definition in file prime_hash.h.

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Enumeration Type Documentation

enum hash_source

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_rand some random data which is not related to any header field
• shs_error no hash specified

Definition at line 51 of file prime_hash.h.

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Function Documentation

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

The hash algorith is CRC32.

Definition at line 55 of file prime_hash.c.

References crc32_uint().

Referenced by rewrite_on_rule().

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