| /* |
| * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that: (1) source code distributions |
| * retain the above copyright notice and this paragraph in its entirety, (2) |
| * distributions including binary code include the above copyright notice and |
| * this paragraph in its entirety in the documentation or other materials |
| * provided with the distribution, and (3) all advertising materials mentioning |
| * features or use of this software display the following acknowledgement: |
| * ``This product includes software developed by the University of California, |
| * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of |
| * the University nor the names of its contributors may be used to endorse |
| * or promote products derived from this software without specific prior |
| * written permission. |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| */ |
| |
| /* \summary: Apple's DLT_PKTAP printer */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include <netdissect-stdinc.h> |
| |
| #include "netdissect.h" |
| #include "extract.h" |
| |
| #ifdef DLT_PKTAP |
| |
| /* |
| * XXX - these are little-endian in the captures I've seen, but Apple |
| * no longer make any big-endian machines (Macs use x86, iOS machines |
| * use ARM and run it little-endian), so that might be by definition |
| * or they might be host-endian. |
| * |
| * If a big-endian PKTAP file ever shows up, and it comes from a |
| * big-endian machine, presumably these are host-endian, and we need |
| * to just fetch the fields directly in tcpdump but byte-swap them |
| * to host byte order in libpcap. |
| */ |
| typedef struct pktap_header { |
| uint32_t pkt_len; /* length of pktap header */ |
| uint32_t pkt_rectype; /* type of record */ |
| uint32_t pkt_dlt; /* DLT type of this packet */ |
| char pkt_ifname[24]; /* interface name */ |
| uint32_t pkt_flags; |
| uint32_t pkt_pfamily; /* "protocol family" */ |
| uint32_t pkt_llhdrlen; /* link-layer header length? */ |
| uint32_t pkt_lltrlrlen; /* link-layer trailer length? */ |
| uint32_t pkt_pid; /* process ID */ |
| char pkt_cmdname[20]; /* command name */ |
| uint32_t pkt_svc_class; /* "service class" */ |
| uint16_t pkt_iftype; /* "interface type" */ |
| uint16_t pkt_ifunit; /* unit number of interface? */ |
| uint32_t pkt_epid; /* "effective process ID" */ |
| char pkt_ecmdname[20]; /* "effective command name" */ |
| } pktap_header_t; |
| |
| /* |
| * Record types. |
| */ |
| #define PKT_REC_NONE 0 /* nothing follows the header */ |
| #define PKT_REC_PACKET 1 /* a packet follows the header */ |
| |
| static inline void |
| pktap_header_print(netdissect_options *ndo, const u_char *bp, u_int length) |
| { |
| const pktap_header_t *hdr; |
| uint32_t dlt, hdrlen; |
| const char *dltname; |
| |
| hdr = (const pktap_header_t *)bp; |
| |
| dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); |
| hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); |
| dltname = pcap_datalink_val_to_name(dlt); |
| if (!ndo->ndo_qflag) { |
| ND_PRINT((ndo,"DLT %s (%d) len %d", |
| (dltname != NULL ? dltname : "UNKNOWN"), dlt, hdrlen)); |
| } else { |
| ND_PRINT((ndo,"%s", (dltname != NULL ? dltname : "UNKNOWN"))); |
| } |
| |
| ND_PRINT((ndo, ", length %u: ", length)); |
| } |
| |
| /* |
| * This is the top level routine of the printer. 'p' points |
| * to the ether header of the packet, 'h->ts' is the timestamp, |
| * 'h->len' is the length of the packet off the wire, and 'h->caplen' |
| * is the number of bytes actually captured. |
| */ |
| u_int |
| pktap_if_print(netdissect_options *ndo, |
| const struct pcap_pkthdr *h, const u_char *p) |
| { |
| uint32_t dlt, hdrlen, rectype; |
| u_int caplen = h->caplen; |
| u_int length = h->len; |
| if_printer printer; |
| const pktap_header_t *hdr; |
| struct pcap_pkthdr nhdr; |
| |
| if (caplen < sizeof(pktap_header_t) || length < sizeof(pktap_header_t)) { |
| ND_PRINT((ndo, "[|pktap]")); |
| return (0); |
| } |
| hdr = (const pktap_header_t *)p; |
| dlt = EXTRACT_LE_32BITS(&hdr->pkt_dlt); |
| hdrlen = EXTRACT_LE_32BITS(&hdr->pkt_len); |
| if (hdrlen < sizeof(pktap_header_t)) { |
| /* |
| * Claimed header length < structure length. |
| * XXX - does this just mean some fields aren't |
| * being supplied, or is it truly an error (i.e., |
| * is the length supplied so that the header can |
| * be expanded in the future)? |
| */ |
| ND_PRINT((ndo, "[|pktap]")); |
| return (0); |
| } |
| if (caplen < hdrlen || length < hdrlen) { |
| ND_PRINT((ndo, "[|pktap]")); |
| return (hdrlen); |
| } |
| |
| if (ndo->ndo_eflag) |
| pktap_header_print(ndo, p, length); |
| |
| length -= hdrlen; |
| caplen -= hdrlen; |
| p += hdrlen; |
| |
| rectype = EXTRACT_LE_32BITS(&hdr->pkt_rectype); |
| switch (rectype) { |
| |
| case PKT_REC_NONE: |
| ND_PRINT((ndo, "no data")); |
| break; |
| |
| case PKT_REC_PACKET: |
| if ((printer = lookup_printer(dlt)) != NULL) { |
| nhdr = *h; |
| nhdr.caplen = caplen; |
| nhdr.len = length; |
| hdrlen += printer(ndo, &nhdr, p); |
| } else { |
| if (!ndo->ndo_eflag) |
| pktap_header_print(ndo, (const u_char *)hdr, |
| length + hdrlen); |
| |
| if (!ndo->ndo_suppress_default_print) |
| ND_DEFAULTPRINT(p, caplen); |
| } |
| break; |
| } |
| |
| return (hdrlen); |
| } |
| |
| /* |
| * Local Variables: |
| * c-style: whitesmith |
| * c-basic-offset: 8 |
| * End: |
| */ |
| |
| #endif /* DLT_PKTAP */ |