SwitchDiscovery class

Class providing a switch discovery class for discovering network switch properties - subclass of Discovery class. More...

Collaboration diagram for SwitchDiscovery class:

Data Structures
struct	_SwitchDiscoveryType

Typedefs
typedef struct _SwitchDiscoveryType	SwitchDiscoveryType

Functions
FSTATIC void	_switchdiscovery_finalize (AssimObj *dself)
	finalize a SwitchDiscovery object More...
FSTATIC gboolean	_switchdiscovery_discover (Discovery *self)
	Discover member function for timed discovery – not applicable – return FALSE. More...
FSTATIC gboolean	_switchdiscovery_dispatch (GSource_pcap_t *gsource,pcap_t *capstruct,gconstpointer pkt,gconstpointer pend,const struct pcap_pkthdr *pkthdr,const char *capturedev,gpointer selfptr)
	Internal pcap gsource dispatch routine - called when we get a packet. More...
SwitchDiscovery *	switchdiscovery_new (const char *instance, const char *dev, guint listenmask, gint priority, GMainContext *mcontext, NetGSource *iosrc, ConfigContext *config, gsize objsize)
	SwitchDiscovery constructor. More...
FSTATIC gboolean	_switchdiscovery_cache_info (SwitchDiscovery *self,gconstpointer pkt,gconstpointer pktend)

Detailed Description

Class providing a switch discovery class for discovering network switch properties - subclass of Discovery class.

We deal with things like CDP, LDP and so on in order to "hear" our switch/port configuration.

Typedef Documentation

typedef struct _SwitchDiscoveryType SwitchDiscoveryType

Definition at line 145 of file switchdiscovery.c.

Function Documentation

FSTATIC gboolean _switchdiscovery_cache_info	(	SwitchDiscovery *	self,
		gconstpointer	pkt,
		gconstpointer	pktend
	)

Returns

TRUE if this data is new or has changed from our previously cached version.

Todo:

deal with switches that send both LLDP and CDP packets

Parameters

[in,out]	self	Our SwitchDiscovery object
[in]	pkt	Pointer to the packet just read in
[in]	pktend	Pointer to first byte past 'pkt'

Definition at line 159 of file switchdiscovery.c.

References DIMOF, and FREE.

Referenced by _switchdiscovery_dispatch().

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FSTATIC gboolean _switchdiscovery_discover

(

Discovery *

self

)

Discover member function for timed discovery – not applicable – return FALSE.

Parameters

[in,out]

self

Definition at line 66 of file switchdiscovery.c.

Referenced by switchdiscovery_new().

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FSTATIC gboolean _switchdiscovery_dispatch	(	GSource_pcap_t *	gsource,
		pcap_t *	capstruct,
		gconstpointer	pkt,
		gconstpointer	pend,
		const struct pcap_pkthdr *	pkthdr,
		const char *	capturedev,
		gpointer	selfptr
	)

Internal pcap gsource dispatch routine - called when we get a packet.

It examines the packet and sees if it is the same switch id and port ID as previously. If there is no previous packet, or something has changed, it constructs a packet encapsulating the captured packet, then sends this encapsulated packet "upstream" to the CMA. All we care about about are those two fields - the rest we leave to the CMA.

Don't cache if we can't send - and don't send if we have sent this info previously.

Parameters

[in]	gsource	Gsource object causing dispatch
[in]	capstruct	Pointer to structure capturing for us
[in]	pkt	Pointer to the packet just read in
[in]	pend	Pointer to first byte past 'pkt'
[in]	pkthdr	libpcap packet header
[in]	capturedev	Device being captured
[in,out]	selfptr	pointer to our Discover object

Definition at line 80 of file switchdiscovery.c.

References _Discovery::_config, _Discovery::_iosource, _NetGSource::_netio, _switchdiscovery_cache_info(), CASTTOCLASS, CONFIGNAME_CMADISCOVER, construct_pcap_frameset(), DEFAULT_FSP_QID, FRAMESETTYPE_SWDISCOVER, _ConfigContext::getaddr, _NetIO::sendareliablefs(), transport, and UNREF.

Referenced by switchdiscovery_new().

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FSTATIC void _switchdiscovery_finalize

(

AssimObj *

self

)

finalize a SwitchDiscovery object

Definition at line 43 of file switchdiscovery.c.

References CASTTOCLASS.

Referenced by switchdiscovery_new().

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SwitchDiscovery* switchdiscovery_new	(	const char *	instance,
		const char *	dev,
		guint	listenmask,
		gint	priority,
		GMainContext *	mcontext,
		NetGSource *	iosrc,
		ConfigContext *	config,
		gsize	objsize
	)

SwitchDiscovery constructor.

Good for discovering switch information via pcap-enabled discovery protocols (like LLDP and CDP)

Parameters

[in]	instance	instance name
[in]	dev	device to listen on
[in]	listenmask	what protocols to listen to
[in]	priority	source priority
[in,out]	mcontext	mainloop context
[in,out]	iosrc	I/O object
[in,out]	config	configuration context
[in]	objsize	object size

Definition at line 113 of file switchdiscovery.c.

References _AssimObj::_finalize, _switchdiscovery_discover(), _switchdiscovery_dispatch(), _switchdiscovery_finalize(), _Discovery::baseclass, CASTTOCLASS, _Discovery::discover, discovery_new(), discovery_register(), _SwitchDiscovery::finalize, g_source_pcap_new(), _SwitchDiscovery::portid, _SwitchDiscovery::portidlen, proj_class_register_subclassed(), _SwitchDiscovery::source, _SwitchDiscovery::switchid, and _SwitchDiscovery::switchidlen.

Referenced by nano_start_full().

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