| 1 | /* |
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| 2 | * This file is part of libtrace |
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| 3 | * |
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| 4 | * Copyright (c) 2007,2008,2009,2010 The University of Waikato, Hamilton, |
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| 5 | * New Zealand. |
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| 6 | * |
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| 7 | * Authors: Daniel Lawson |
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| 8 | * Perry Lorier |
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| 9 | * Shane Alcock |
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| 10 | * |
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| 11 | * All rights reserved. |
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| 12 | * |
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| 13 | * This code has been developed by the University of Waikato WAND |
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| 14 | * research group. For further information please see http://www.wand.net.nz/ |
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| 15 | * |
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| 16 | * libtrace is free software; you can redistribute it and/or modify |
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| 17 | * it under the terms of the GNU General Public License as published by |
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| 18 | * the Free Software Foundation; either version 2 of the License, or |
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| 19 | * (at your option) any later version. |
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| 20 | * |
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| 21 | * libtrace is distributed in the hope that it will be useful, |
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| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 24 | * GNU General Public License for more details. |
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| 25 | * |
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| 26 | * You should have received a copy of the GNU General Public License |
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| 27 | * along with libtrace; if not, write to the Free Software |
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| 28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 29 | * |
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| 30 | * $Id$ |
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| 31 | * |
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| 32 | */ |
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| 33 | |
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| 34 | |
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| 35 | #ifdef HAVE_PCAP |
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| 36 | #include "config.h" |
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| 37 | |
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| 38 | #ifndef HAVE_PCAP_NEXT_EX |
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| 39 | #include <stdio.h> |
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| 40 | #include <pcap.h> |
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| 41 | #ifdef HAVE_PCAP_INT_H |
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| 42 | # include <pcap-int.h> |
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| 43 | #endif |
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| 44 | #include <string.h> |
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| 45 | #include <libtrace.h> |
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| 46 | #include <stdlib.h> |
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| 47 | |
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| 48 | /* Custom implementation of pcap_next_ex as some versions of PCAP do not have |
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| 49 | * it */ |
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| 50 | |
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| 51 | struct pcap_data_t { |
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| 52 | struct pcap_pkthdr *header; |
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| 53 | u_char *payload; |
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| 54 | }; |
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| 55 | |
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| 56 | |
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| 57 | static struct pcap_data_t pcap_data; |
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| 58 | |
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| 59 | static void trace_pcap_handler(u_char *user, const struct pcap_pkthdr *pcaphdr,const u_char *pcappkt) { |
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| 60 | struct pcap_data_t *packet = (struct pcap_data_t *)user; |
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| 61 | |
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| 62 | /* pcaphdr and pcappkt don't seem to persist for particularly long |
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| 63 | * so we need to memcpy them. Obviously, this spoils the whole |
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| 64 | * zero-copy concept but if you're using outdated pcap libraries |
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| 65 | * you deserve everything you get |
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| 66 | */ |
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| 67 | memcpy(packet->header, pcaphdr, sizeof(struct pcap_pkthdr)); |
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| 68 | memcpy(packet->payload, pcappkt, packet->header->len); |
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| 69 | } |
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| 70 | |
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| 71 | |
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| 72 | int pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header, |
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| 73 | const u_char **pkt_data) { |
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| 74 | |
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| 75 | int pcapbytes = 0; |
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| 76 | |
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| 77 | pcap_data.header = *pkt_header; |
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| 78 | pcap_data.payload = *pkt_data; |
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| 79 | |
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| 80 | pcapbytes = pcap_dispatch(p, 1, &trace_pcap_handler, |
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| 81 | (u_char *) &pcap_data); |
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| 82 | |
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| 83 | if (pcapbytes == -1) |
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| 84 | return -1; |
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| 85 | |
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| 86 | if (pcapbytes == 0 && pcap_file(p) != NULL) |
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| 87 | return -2; |
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| 88 | |
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| 89 | if (pcapbytes == 0) |
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| 90 | return 0; |
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| 91 | |
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| 92 | return 1; |
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| 93 | } |
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| 94 | #endif |
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| 95 | |
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| 96 | #endif //HAVE_PCAP |
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