mac_ifinfo_list Struct Reference

Linked list containing structures, as members, for existing interfaces. More...

#include <libmac.h>

Data Fields
char	if_name [IFNAME+1]
	Char array used to store interface name.
char	ip_addr [IPSIZE+1]
	Char array used to store IP address of interface.
u_char	hw_addr [MACSIZE+1]
	Unsigned char array used to store MAC address of interface.
char	mac_flag
	Boolean flag variable that is used to store information on whether an interface is wireless or not.
libnet_t *	link_struct
	This struct is filled in when an interface is opened by the libnet library. It is used, subsequently, by the libnet function that "writes" the packet to the link layer.
pcap_t *	pcap_descr
	Packet capture descriptor returned when the libpcap library opens an interface. It is used, subsequently, by the libpcap function that "reads" a packet from the link layer.
unsigned char	num_supported_params
	Number of supported parameters.
unsigned char	supported_params [((MAX_NO_PARAMS)/(CHAR_BIT))]
	256-bit bitmap for supported params. If the bit corresponding to a parameter is 1, then it is supported. If it is 0, it is not supported.
unsigned char	mode_params [((MAX_NO_PARAMS)/(CHAR_BIT))]
	256-bit bitmap that tells us whether the supported params are read-only or read-write. If the bit corresponding to a parameter is 1, then it is read-write. If it is 0, it is read-only.
unsigned char	append_params_incmg [((MAX_NO_PARAMS)/(CHAR_BIT))]
	256-bit bitmap that tells us which params are appended on incoming frames. If the bit corresponding to a parameter is 1, then it is appended. If it is 0, it is not.
unsigned char	append_params_outgng [((MAX_NO_PARAMS)/(CHAR_BIT))]
	256-bit bitmap that tells us which params are appended on outgng frames. If the bit corresponding to a parameter is 1, then it is appended. If it is 0, it is not.
mac_recv_frame_info	frame_info
	Struct used to communicate between pcap_loop and its callback function.
mac_promisc_recv_frame_info	promisc_frame_info
	Struct used to communicate between pcap_loop and its callback function in monitor mode.
mac_ifinfo_list *	next
	Pointer to the next member defining another interface if it is present.

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Detailed Description

This linked list of structures is filled in, before frames are sent/received, by the mac_get_ifinfo function.

Initialization:

• No storage is set aside for a member till an interface is detected.
• Once an interface is detected, storage is allocated dynamically.
• The pointers, link_struct, pcap_descr and next are set to NULL.
• The members, num_supported_params, supported_params, mode_params, append_params_incmg and append_params_outgng are initialized to 0.

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