/* * netsniff-ng - the packet sniffing beast * Copyright 2009, 2010 Daniel Borkmann. * Subject to the GPL, version 2. */ #include #include #include /* for ntohs() */ #include "proto.h" #include "protos.h" #include "lookup.h" #include "pkt_buff.h" struct udphdr { uint16_t source; uint16_t dest; uint16_t len; uint16_t check; } __packed; static void udp(struct pkt_buff *pkt) { struct udphdr *udp = (struct udphdr *) pkt_pull(pkt, sizeof(*udp)); ssize_t len; uint16_t src, dest; const char *src_name, *dest_name; if (udp == NULL) return; len = ntohs(udp->len) - sizeof(*udp); src = ntohs(udp->source); dest = ntohs(udp->dest); src_name = lookup_port_udp(src); dest_name = lookup_port_udp(dest); tprintf(" [ UDP "); tprintf("Port (%u", src); if (src_name) tprintf(" (%s%s%s)", colorize_start(bold), src_name, colorize_end()); tprintf(" => %u", dest); if (dest_name) tprintf(" (%s%s%s)", colorize_start(bold), dest_name, colorize_end()); tprintf("), "); if(len > pkt_len(pkt) || len < 0){ tprintf("Len (%u) %s, ", ntohs(udp->len), colorize_start_full(black, red) "invalid" colorize_end()); } tprintf("Len (%u Bytes, %zd Bytes Data), ", ntohs(udp->len), len); tprintf("CSum (0x%.4x)", ntohs(udp->check)); tprintf(" ]\n"); } static void udp_less(struct pkt_buff *pkt) { struct udphdr *udp = (struct udphdr *) pkt_pull(pkt, sizeof(*udp)); uint16_t src, dest; const char *src_name, *dest_name; if (udp == NULL) return; src = ntohs(udp->source); dest = ntohs(udp->dest); src_name = lookup_port_udp(src); dest_name = lookup_port_udp(dest); tprintf(" UDP %u", src); if(src_name) tprintf("(%s%s%s)", colorize_start(bold), src_name, colorize_end()); tprintf("/%u", dest); if (dest_name) tprintf("(%s%s%s)", colorize_start(bold), dest_name, colorize_end()); } struct protocol udp_ops = { .key = 0x11, .print_full = udp, .print_less = udp_less, }; e-remove&id=647bf3d8a8e5777319da92af672289b2a6c4dc66'>treecommitdiff
AgeCommit message (Expand)AuthorFilesLines