/* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010 Daniel Borkmann. * Copyright 2014 Tobias Klauser * Subject to the GPL, version 2. */ #include #include #include #include #include "proto.h" #include "dissector_eth.h" #include "lookup.h" #include "pkt_buff.h" static inline bool is_multicast_ether_addr(const uint8_t *mac) { return mac[0] & 0x01; } static inline bool is_broadcast_ether_addr(const uint8_t *mac) { return (mac[0] & mac[1] & mac[2] & mac[3] & mac[4] & mac[5]) == 0xff; } static inline bool is_local_ether_addr(const u8 *mac) { return 0x02 & mac[0]; } static const char *ether_lookup_addr(const uint8_t *mac) { if (is_multicast_ether_addr(mac)) { if (is_broadcast_ether_addr(mac)) return "Broadcast"; else return "Multicast"; } else if (is_local_ether_addr(mac)) { return "Locally Administered"; } /* found no matching address, so look up the vendor from OUI */ return lookup_vendor_str((mac[0] << 16) | (mac[1] << 8) | mac[2]); } static void ethernet(struct pkt_buff *pkt) { const char *type; uint8_t *src_mac, *dst_mac; struct ethhdr *eth = (struct ethhdr *) pkt_pull(pkt, sizeof(*eth)); if (eth == NULL) return; src_mac = eth->h_source; dst_mac = eth->h_dest; tprintf(" [ Eth "); tprintf("MAC (%.2x:%.2x:%.2x:%.2x:%.2x:%.2x => ", src_mac[0], src_mac[1], src_mac[2], src_mac[3], src_mac[4], src_mac[5]); tprintf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x), ", dst_mac[0], dst_mac[1], dst_mac[2], dst_mac[3], dst_mac[4], dst_mac[5]); tprintf("Proto (0x%.4x", ntohs(eth->h_proto)); type = lookup_ether_type(ntohs(eth->h_proto)); if (type) tprintf(", %s%s%s", colorize_start(bold), type, colorize_end()); tprintf(") ]\n"); tprintf(" [ Vendor "); tprintf("(%s => %s)", ether_lookup_addr(src_mac), ether_lookup_addr(dst_mac)); tprintf(" ]\n"); pkt_set_dissector(pkt, ð_lay2, ntohs(eth->h_proto)); } static void ethernet_less(struct pkt_buff *pkt) { uint8_t *src_mac, *dst_mac; struct ethhdr *eth = (struct ethhdr *) pkt_pull(pkt, sizeof(*eth)); if (eth == NULL) return; src_mac = eth->h_source; dst_mac = eth->h_dest; tprintf(" %s => %s ", ether_lookup_addr(src_mac), ether_lookup_addr(dst_mac)); tprintf("%s%s%s", colorize_start(bold), lookup_ether_type(ntohs(eth->h_proto)), colorize_end()); pkt_set_dissector(pkt, ð_lay2, ntohs(eth->h_proto)); } struct protocol ethernet_ops = { .key = 0, .print_full = ethernet, .print_less = ethernet_less, }; qt'>
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