/* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010, 2011, 2012 Daniel Borkmann. * Subject to the GPL, version 2. */ #include #include #include #include "built_in.h" #include "tprintf.h" #include "pkt_buff.h" #include "proto.h" #include "protos.h" #include "dissector.h" #include "dissector_eth.h" #include "dissector_80211.h" int dissector_set_print_type(void *ptr, int type) { struct protocol *proto; for (proto = ptr; proto; proto = proto->next) { switch (type) { case PRINT_NORM: proto->process = proto->print_full; break; case PRINT_LESS: proto->process = proto->print_less; break; default: proto->process = NULL; break; } } return 0; } static void dissector_main(struct pkt_buff *pkt, struct protocol *start, struct protocol *end) { struct protocol *proto; if (!start) return; for (pkt->proto = start; pkt->proto; ) { if (unlikely(!pkt->proto->process)) break; proto = pkt->proto; pkt->proto = NULL; proto->process(pkt); } if (end && likely(end->process)) end->process(pkt); } void dissector_entry_point(uint8_t *packet, size_t len, int linktype, int mode) { bool skip_dissecting = false; struct protocol *proto_start, *proto_end; struct pkt_buff *pkt = NULL; if (mode == PRINT_NONE) return; pkt = pkt_alloc(packet, len); switch (linktype) { case LINKTYPE_EN10MB: case ___constant_swab32(LINKTYPE_EN10MB): proto_start = dissector_get_ethernet_entry_point(); proto_end = dissector_get_ethernet_exit_point(); break; case LINKTYPE_IEEE802_11: case ___constant_swab32(LINKTYPE_IEEE802_11): proto_start = dissector_get_ieee80211_entry_point(); proto_end = dissector_get_ieee80211_exit_point(); break; default: skip_dissecting = true; break; }; if (!skip_dissecting) dissector_main(pkt, proto_start, proto_end); switch (mode) { case PRINT_HEX: hex(pkt); break; case PRINT_ASCII: ascii(pkt); break; case PRINT_HEX_ASCII: hex_ascii(pkt); break; } tprintf_flush(); pkt_free(pkt); } void dissector_init_all(int fnttype) { dissector_init_ethernet(fnttype); dissector_init_ieee80211(fnttype); } void dissector_cleanup_all(void) { dissector_cleanup_ethernet(); dissector_cleanup_ieee80211(); }
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