/* * radsniff.h Structures and defines for the RADIUS sniffer. * * Version: $Id$ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA * * Copyright 2006 The FreeRADIUS server project * Copyright 2006 Nicolas Baradakis <nicolas.baradakis@cegetel.net> */ #include <freeradius-devel/ident.h> RCSIDH(radsniff_h, "$Id$") #include <sys/types.h> #include <netinet/in.h> /* * The number of bytes in an ethernet (MAC) address. */ #define ETHER_ADDR_LEN 6 /* * Structure of a DEC/Intel/Xerox or 802.3 Ethernet header. */ struct ethernet_header { uint8_t ethernet_dhost[ETHER_ADDR_LEN]; uint8_t ethernet_shost[ETHER_ADDR_LEN]; uint16_t ethernet_type; }; /* * Length of a DEC/Intel/Xerox or 802.3 Ethernet header. * Note that some compilers may pad "struct ether_header" to * a multiple of 4 *bytes, for example, so "sizeof (struct * ether_header)" may not give the right answer. */ #define ETHER_HDRLEN 14 /* * Structure of an internet header, naked of options. */ struct ip_header { uint8_t ip_vhl; /* header length, version */ #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4) #define IP_HL(ip) ((ip)->ip_vhl & 0x0f) uint8_t ip_tos; /* type of service */ uint16_t ip_len; /* total length */ uint16_t ip_id; /* identification */ uint16_t ip_off; /* fragment offset field */ #define I_DF 0x4000 /* dont fragment flag */ #define IP_MF 0x2000 /* more fragments flag */ #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ uint8_t ip_ttl; /* time to live */ uint8_t ip_p; /* protocol */ uint16_t ip_sum; /* checksum */ struct in_addr ip_src,ip_dst; /* source and dest address */ }; /* * UDP protocol header. * Per RFC 768, September, 1981. */ struct udp_header { uint16_t udp_sport; /* source port */ uint16_t udp_dport; /* destination port */ uint16_t udp_ulen; /* udp length */ uint16_t udp_sum; /* udp checksum */ }; /* * RADIUS packet length. * RFC 2865, Section 3., subsection 'length' says: * " ... and maximum length is 4096." */ #define MAX_RADIUS_LEN 4096 #define MIN_RADIUS_LEN 20 #define SNAPLEN (sizeof(struct ethernet_header) + sizeof(struct ip_header) + sizeof(struct udp_header) + MAX_RADIUS_LEN) typedef struct radius_packet_t { uint8_t code; uint8_t id; uint8_t length[2]; uint8_t vector[AUTH_VECTOR_LEN]; uint8_t data[1]; } radius_packet_t; #define AUTH_HDR_LEN 20