ring.c File Reference

Only allow one 183 message per call-id

• Module; UTILS :: Ringing functionality.

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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include "../../parser/msg_parser.h"
#include "../../dprint.h"
#include "../../error.h"
#include "../../ut.h"
#include "../../mem/mem.h"
#include "../../mem/shm_mem.h"
#include "../../timer.h"
#include "../../locking.h"
#include "../../md5.h"
#include "ring.h"

Include dependency graph for ring.c:

Go to the source code of this file.

Data Structures
struct	hashtable_entry_t
struct	ring_record_t
Typedefs
typedef struct hashtable_entry_t	hashtable_t [HASHTABLESIZE]
Functions
static int	contains (str callid)
	Helper functions that checks if the hash table contains the callid.
static int	conv183 (struct sip_msg *msg)
	Convert a 180 to a 180 message.
static unsigned int	hash (char *buf, int len)
	Hash helper function.
static void	insert (str callid)
	Insert a new entry on the hashtable.
static void	remove_timeout (unsigned int index)
	Expire entries on the hashtable.
void	ring_destroy_hashtable (void)
	Destroy the ring hashtable.
int	ring_filter (struct sip_msg *msg, void *bar)
	Callback function that does the work inside the server.
int	ring_fixup (void **param, int param_no)
	Fixup function for the ring_insert_callid function.
void	ring_init_hashtable (void)
	Initialize the ring hashtable in shared memory.
int	ring_insert_callid (struct sip_msg *msg, char *unused1, char *unused2)
	Inserts callid of message into hashtable.
Variables
static hashtable_t *	hashtable = NULL

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Detailed Description

Only allow one 183 message per call-id

• Module; UTILS :: Ringing functionality.

Definition in file ring.c.

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Typedef Documentation

typedef struct hashtable_entry_t hashtable_t[HASHTABLESIZE]

Definition at line 69 of file ring.c.

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Function Documentation

static int contains

(

str

callid

)

[static]

Helper functions that checks if the hash table contains the callid.

Parameters:

callid

Call-ID that is searched

Returns:

1 when callid could be found, 0 when not found

Definition at line 223 of file ring.c.

References ring_record_t::callid, hash, HASHTABLEMASK, _str::len, ring_record_t::next, remove_timeout(), and _str::s.

Referenced by ring_filter(), and ring_insert_callid().

static int conv183

(

struct sip_msg *

msg

)

[static]

Convert a 180 to a 180 message.

Parameters:

msg

SIP message

Definition at line 242 of file ring.c.

References sip_msg::buf, sip_msg::first_line, sip_msg::len, LM_ERR, NULL, msg_start::reply, msg_start::u, and sip_msg::unparsed.

Referenced by ring_filter().

static unsigned int hash	(	char *	buf,
		int	len
	)			[static]

Hash helper function.

Parameters:

	buf	hashed buffer
	len	length of buffer

Returns:

hash value, can be 0

Definition at line 152 of file ring.c.

References MD5Final(), MD5Init(), and MD5Update().

static void insert

(

str

callid

)

[static]

Insert a new entry on the hashtable.

Parameters:

callid

Call-ID string

Definition at line 191 of file ring.c.

References ring_record_t::callid, get_ticks(), hash, hashtable, HASHTABLEMASK, _str::len, LM_DBG, MAXCALLIDLEN, MIN, ring_record_t::next, NULL, remove_timeout(), _str::s, shm_malloc(), and ring_record_t::time.

Referenced by ring_insert_callid(), send_publish(), and send_subscribe().

static void remove_timeout

(

unsigned int

index

)

[static]

Expire entries on the hashtable.

Parameters:

index

array index that should expired

Definition at line 175 of file ring.c.

References ring_record_t::callid, get_ticks(), hashtable, LM_DBG, ring_record_t::next, NULL, ring_timeout, shm_free, and ring_record_t::time.

Referenced by contains(), and insert().

void ring_destroy_hashtable

(

void

)

Destroy the ring hashtable.

Definition at line 127 of file ring.c.

References hashtable, HASHTABLESIZE, hashtable_entry_t::head, ring_record_t::next, NULL, and shm_free.

Referenced by mod_destroy().

int ring_filter	(	struct sip_msg *	msg,
		void *	bar
	)

Callback function that does the work inside the server.

Parameters:

	msg	SIP message
	bar	unused

Returns:

1 on success, -1 on failure

Definition at line 323 of file ring.c.

References hdr_field::body, sip_msg::callid, contains(), conv183(), sip_msg::first_line, HDR_CALLID_F, _str::len, LM_DBG, LM_ERR, parse_headers(), msg_start::reply, ring_lock, _str::s, SIP_REPLY, msg_start::type, and msg_start::u.

Referenced by mod_init().

int ring_fixup	(	void **	param,
		int	param_no
	)

Fixup function for the ring_insert_callid function.

Parameters:

	param	unused
	param_no	unused

Returns:

0

Definition at line 356 of file ring.c.

References LM_ERR, and ring_timeout.

void ring_init_hashtable

(

void

)

Initialize the ring hashtable in shared memory.

Definition at line 111 of file ring.c.

References hashtable, HASHTABLESIZE, NULL, and shm_malloc().

Referenced by mod_init().

int ring_insert_callid	(	struct sip_msg *	msg,
		char *	unused1,
		char *	unused2
	)

Inserts callid of message into hashtable.

Inserts callid of message into hashtable. Any 183 messages with this callid that occur in the next ring_timeout seconds, will be converted to 180.

Parameters:

	msg	SIP message
	unused1	unused
	unused2	unused

Returns:

1 on success, -1 otherwise

Definition at line 90 of file ring.c.

References hdr_field::body, sip_msg::callid, contains(), HDR_CALLID_F, insert(), LM_ERR, parse_headers(), and ring_lock.

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Variable Documentation

hashtable_t* hashtable = NULL [static]

global hashtable

Definition at line 72 of file ring.c.

Referenced by insert(), remove_timeout(), ring_destroy_hashtable(), and ring_init_hashtable().