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 #define NETDISSECT_REWORKED 23 #ifdef HAVE_CONFIG_H 24 #include "config.h" 25 #endif 26 27 #include <tcpdump-stdinc.h> 28 29 #include "interface.h" 30 #include "extract.h" 31 32 #ifdef DLT_PKTAP 33 34 /* 35 * XXX - these are little-endian in the captures I've seen, but Apple 36 * no longer make any big-endian machines (Macs use x86, iOS machines 37 * use ARM and run it little-endian), so that might be by definition 38 * or they might be host-endian. 39 * 40 * If a big-endian PKTAP file ever shows up, and it comes from a 41 * big-endian machine, presumably these are host-endian, and we need 42 * to just fetch the fields directly in tcpdump but byte-swap them 43 * to host byte order in libpcap. 44 */ 45 typedef struct pktap_header { 46 uint32_t pkt_len; /* length of pktap header */ 47 uint32_t pkt_rectype; /* type of record */ 48 uint32_t pkt_dlt; /* DLT type of this packet */ 49 char pkt_ifname[24]; /* interface name */ 50 uint32_t pkt_flags; 51 uint32_t pkt_pfamily; /* "protocol family" */ 52 uint32_t pkt_llhdrlen; /* link-layer header length? */ 53 uint32_t pkt_lltrlrlen; /* link-layer trailer length? */ 54 uint32_t pkt_pid; /* process ID */ 55 char pkt_cmdname[20]; /* command name */ 56 uint32_t pkt_svc_class; /* "service class" */ 57 uint16_t pkt_iftype; /* "interface type" */ 58 uint16_t pkt_ifunit; /* unit number of interface? */ 59 uint32_t pkt_epid; /* "effective process ID" */ 60 char pkt_ecmdname[20]; /* "effective command name" */ 61 } pktap_header_t; 62 63 /* 64 * Record types. 65 */ 66 #define PKT_REC_NONE 0 /* nothing follows the header */ 67 #define PKT_REC_PACKET 1 /* a packet follows the header */ 68 69 static inline void 70 pktap_header_print(netdissect_options *ndo, const u_char *bp, u_int length) 71 { 72 const pktap_header_t *hdr; 73 uint32_t dlt, hdrlen; 74 75 hdr = (const pktap_header_t *)bp; 76 77 dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); 78 hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); 79 if (!ndo->ndo_qflag) { 80 ND_PRINT((ndo,", DLT %s (%d) len %d", 81 pcap_datalink_val_to_name(dlt), dlt, hdrlen)); 82 } else { 83 ND_PRINT((ndo,", %s", pcap_datalink_val_to_name(dlt))); 84 } 85 86 ND_PRINT((ndo, ", length %u: ", length)); 87 } 88 89 /* 90 * This is the top level routine of the printer. 'p' points 91 * to the ether header of the packet, 'h->ts' is the timestamp, 92 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 93 * is the number of bytes actually captured. 94 */ 95 u_int 96 pktap_if_print(netdissect_options *ndo, 97 const struct pcap_pkthdr *h, const u_char *p) 98 { 99 uint32_t dlt, hdrlen, rectype; 100 u_int caplen = h->caplen; 101 u_int length = h->len; 102 if_ndo_printer ndo_printer; 103 if_printer printer; 104 pktap_header_t *hdr; 105 106 if (caplen < sizeof(pktap_header_t) || length < sizeof(pktap_header_t)) { 107 ND_PRINT((ndo, "[|pktap]")); 108 return (0); 109 } 110 hdr = (pktap_header_t *)p; 111 dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); 112 hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); 113 if (hdrlen < sizeof(pktap_header_t)) { 114 /* 115 * Claimed header length < structure length. 116 * XXX - does this just mean some fields aren't 117 * being supplied, or is it truly an error (i.e., 118 * is the length supplied so that the header can 119 * be expanded in the future)? 120 */ 121 ND_PRINT((ndo, "[|pktap]")); 122 return (0); 123 } 124 if (caplen < hdrlen || length < hdrlen) { 125 ND_PRINT((ndo, "[|pktap]")); 126 return (hdrlen); 127 } 128 129 if (ndo->ndo_eflag) 130 pktap_header_print(ndo, p, length); 131 132 length -= hdrlen; 133 caplen -= hdrlen; 134 p += hdrlen; 135 136 rectype = EXTRACT_LE_32BITS(&hdr->pkt_rectype); 137 switch (rectype) { 138 139 case PKT_REC_NONE: 140 ND_PRINT((ndo, "no data")); 141 break; 142 143 case PKT_REC_PACKET: 144 if ((printer = lookup_printer(dlt)) != NULL) { 145 printer(h, p); 146 } else if ((ndo_printer = lookup_ndo_printer(dlt)) != NULL) { 147 ndo_printer(ndo, h, p); 148 } else { 149 if (!ndo->ndo_eflag) 150 pktap_header_print(ndo, (u_char *)hdr, 151 length + hdrlen); 152 153 if (!ndo->ndo_suppress_default_print) 154 ND_DEFAULTPRINT(p, caplen); 155 } 156 break; 157 } 158 159 return (hdrlen); 160 } 161 162 /* 163 * Local Variables: 164 * c-style: whitesmith 165 * c-basic-offset: 8 166 * End: 167 */ 168 169 #endif /* DLT_PKTAP */ 170