1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 */ 21 22 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-pktap.c,v 1.2 2014/11/20 03:05:03 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include "interface.h" 35 #include "extract.h" 36 37 #ifdef DLT_PKTAP 38 39 /* 40 * XXX - these are little-endian in the captures I've seen, but Apple 41 * no longer make any big-endian machines (Macs use x86, iOS machines 42 * use ARM and run it little-endian), so that might be by definition 43 * or they might be host-endian. 44 * 45 * If a big-endian PKTAP file ever shows up, and it comes from a 46 * big-endian machine, presumably these are host-endian, and we need 47 * to just fetch the fields directly in tcpdump but byte-swap them 48 * to host byte order in libpcap. 49 */ 50 typedef struct pktap_header { 51 uint32_t pkt_len; /* length of pktap header */ 52 uint32_t pkt_rectype; /* type of record */ 53 uint32_t pkt_dlt; /* DLT type of this packet */ 54 char pkt_ifname[24]; /* interface name */ 55 uint32_t pkt_flags; 56 uint32_t pkt_pfamily; /* "protocol family" */ 57 uint32_t pkt_llhdrlen; /* link-layer header length? */ 58 uint32_t pkt_lltrlrlen; /* link-layer trailer length? */ 59 uint32_t pkt_pid; /* process ID */ 60 char pkt_cmdname[20]; /* command name */ 61 uint32_t pkt_svc_class; /* "service class" */ 62 uint16_t pkt_iftype; /* "interface type" */ 63 uint16_t pkt_ifunit; /* unit number of interface? */ 64 uint32_t pkt_epid; /* "effective process ID" */ 65 char pkt_ecmdname[20]; /* "effective command name" */ 66 } pktap_header_t; 67 68 /* 69 * Record types. 70 */ 71 #define PKT_REC_NONE 0 /* nothing follows the header */ 72 #define PKT_REC_PACKET 1 /* a packet follows the header */ 73 74 static inline void 75 pktap_header_print(netdissect_options *ndo, const u_char *bp, u_int length) 76 { 77 const pktap_header_t *hdr; 78 uint32_t dlt, hdrlen; 79 80 hdr = (const pktap_header_t *)bp; 81 82 dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); 83 hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); 84 if (!ndo->ndo_qflag) { 85 ND_PRINT((ndo,", DLT %s (%d) len %d", 86 pcap_datalink_val_to_name(dlt), dlt, hdrlen)); 87 } else { 88 ND_PRINT((ndo,", %s", pcap_datalink_val_to_name(dlt))); 89 } 90 91 ND_PRINT((ndo, ", length %u: ", length)); 92 } 93 94 /* 95 * This is the top level routine of the printer. 'p' points 96 * to the ether header of the packet, 'h->ts' is the timestamp, 97 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 98 * is the number of bytes actually captured. 99 */ 100 u_int 101 pktap_if_print(netdissect_options *ndo, 102 const struct pcap_pkthdr *h, const u_char *p) 103 { 104 uint32_t dlt, hdrlen, rectype; 105 u_int caplen = h->caplen; 106 u_int length = h->len; 107 if_ndo_printer ndo_printer; 108 if_printer printer; 109 pktap_header_t *hdr; 110 111 if (caplen < sizeof(pktap_header_t) || length < sizeof(pktap_header_t)) { 112 ND_PRINT((ndo, "[|pktap]")); 113 return (0); 114 } 115 hdr = (pktap_header_t *)p; 116 dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); 117 hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); 118 if (hdrlen < sizeof(pktap_header_t)) { 119 /* 120 * Claimed header length < structure length. 121 * XXX - does this just mean some fields aren't 122 * being supplied, or is it truly an error (i.e., 123 * is the length supplied so that the header can 124 * be expanded in the future)? 125 */ 126 ND_PRINT((ndo, "[|pktap]")); 127 return (0); 128 } 129 if (caplen < hdrlen || length < hdrlen) { 130 ND_PRINT((ndo, "[|pktap]")); 131 return (hdrlen); 132 } 133 134 if (ndo->ndo_eflag) 135 pktap_header_print(ndo, p, length); 136 137 length -= hdrlen; 138 caplen -= hdrlen; 139 p += hdrlen; 140 141 rectype = EXTRACT_LE_32BITS(&hdr->pkt_rectype); 142 switch (rectype) { 143 144 case PKT_REC_NONE: 145 ND_PRINT((ndo, "no data")); 146 break; 147 148 case PKT_REC_PACKET: 149 if ((printer = lookup_printer(dlt)) != NULL) { 150 printer(h, p); 151 } else if ((ndo_printer = lookup_ndo_printer(dlt)) != NULL) { 152 ndo_printer(ndo, h, p); 153 } else { 154 if (!ndo->ndo_eflag) 155 pktap_header_print(ndo, (u_char *)hdr, 156 length + hdrlen); 157 158 if (!ndo->ndo_suppress_default_print) 159 ND_DEFAULTPRINT(p, caplen); 160 } 161 break; 162 } 163 164 return (hdrlen); 165 } 166 167 /* 168 * Local Variables: 169 * c-style: whitesmith 170 * c-basic-offset: 8 171 * End: 172 */ 173 174 #endif /* DLT_PKTAP */ 175