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document the use of externip, externhost and other nat-related options, 

as well as the handling of the sip socket.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@75875 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Luigi Rizzo 2007-07-19 08:00:03 +00:00
parent fddd5b557c
commit 192ac53c3f
1 changed files with 45 additions and 1 deletions
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46
channels/chan_sip.c
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@ -1250,13 +1250,57 @@ static struct sip_auth *authl = NULL;
/* --- Sockets and networking --------------*/
static int sipsock = -1; /*!< Main socket for SIP network communication */
/*! \brief Main socket for SIP communication.
* sipsock is shared between the manager thread (which handles reload
* requests), the io handler (sipsock_read()) and the user routines that
* issue writes (using __sip_xmit()).
* The socket is -1 only when opening fails (this is a permanent condition),
* or when we are handling a reload() that changes its address (this is
* a transient situation during which we might have a harmless race, see
* below). Because the conditions for the race to be possible are extremely
* rare, we don't want to pay the cost of locking on every I/O.
* Rather, we remember that when the race may occur, communication is
* bound to fail anyways, so we just live with this event and let
* the protocol handle this above us.
*/
static int sipsock = -1;
static struct sockaddr_in bindaddr = { 0, }; /*!< The address we bind to */
/*! \brief our external IP address/port for SIP sessions.
* externip.sin_addr is only set when we know we might be behind
* a NAT, and this is done using a variety of (mutually exclusive)
* ways from the config file:
*
* + with "externip = host[:port]" we specify the address/port explicitly.
* The address is looked up only once when (re)loading the config file;
*
* + with "externhost = host[:port]" we do a similar thing, but the
* hostname is stored in externhost, and the hostname->IP mapping
* is refreshed every 'externrefresh' seconds;
*
* + with "stunaddr = host[:port]" we run queries every externrefresh seconds
* to the specified server, and store the result in externip.
* XXX not implemented yet.
*
* Other variables (externhost, externexpire, externrefresh) are used
* to support the above functions.
*/
static struct sockaddr_in externip; /*!< External IP address if we are behind NAT */
static char externhost[MAXHOSTNAMELEN]; /*!< External host name (possibly with dynamic DNS and DHCP */
static time_t externexpire = 0; /*!< Expiration counter for re-resolving external host name in dynamic DNS */
static int externrefresh = 10;
/*! \brief List of local networks
* We store "localnet" addresses from the config file into an access list,
* marked as 'DENY', so the call to ast_apply_ha() will return
* AST_SENSE_DENY for 'local' addresses, and AST_SENSE_ALLOW for 'non local'
* (i.e. presumably public) addresses.
*/
static struct ast_ha *localaddr; /*!< List of local networks, on the same side of NAT as this Asterisk */
static struct in_addr __ourip;
static int ourport;
static struct sockaddr_in debugaddr;