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-rw-r--r--print-pktap.c177
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diff --git a/print-pktap.c b/print-pktap.c
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+/*
+ * 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"
+
+#define ND_LONGJMP_FROM_TCHECK
+#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 {
+ nd_uint32_t pkt_len; /* length of pktap header */
+ nd_uint32_t pkt_rectype; /* type of record */
+ nd_uint32_t pkt_dlt; /* DLT type of this packet */
+ char pkt_ifname[24]; /* interface name */
+ nd_uint32_t pkt_flags;
+ nd_uint32_t pkt_pfamily; /* "protocol family" */
+ nd_uint32_t pkt_llhdrlen; /* link-layer header length? */
+ nd_uint32_t pkt_lltrlrlen; /* link-layer trailer length? */
+ nd_uint32_t pkt_pid; /* process ID */
+ char pkt_cmdname[20]; /* command name */
+ nd_uint32_t pkt_svc_class; /* "service class" */
+ nd_uint16_t pkt_iftype; /* "interface type" */
+ nd_uint16_t pkt_ifunit; /* unit number of interface? */
+ nd_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 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 = GET_LE_U_4(hdr->pkt_dlt);
+ hdrlen = GET_LE_U_4(hdr->pkt_len);
+ dltname = pcap_datalink_val_to_name(dlt);
+ if (!ndo->ndo_qflag) {
+ ND_PRINT("DLT %s (%u) len %u",
+ (dltname != NULL ? dltname : "UNKNOWN"), dlt, hdrlen);
+ } else {
+ ND_PRINT("%s", (dltname != NULL ? dltname : "UNKNOWN"));
+ }
+
+ ND_PRINT(", 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.
+ */
+void
+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;
+
+ ndo->ndo_protocol = "pktap";
+ if (length < sizeof(pktap_header_t)) {
+ ND_PRINT(" (packet too short, %u < %zu)",
+ length, sizeof(pktap_header_t));
+ goto invalid;
+ }
+ hdr = (const pktap_header_t *)p;
+ dlt = GET_LE_U_4(hdr->pkt_dlt);
+ hdrlen = GET_LE_U_4(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(" (pkt_len too small, %u < %zu)",
+ hdrlen, sizeof(pktap_header_t));
+ goto invalid;
+ }
+ if (hdrlen > length) {
+ ND_PRINT(" (pkt_len too big, %u > %u)",
+ hdrlen, length);
+ goto invalid;
+ }
+ ND_TCHECK_LEN(p, hdrlen);
+
+ if (ndo->ndo_eflag)
+ pktap_header_print(ndo, p, length);
+
+ length -= hdrlen;
+ caplen -= hdrlen;
+ p += hdrlen;
+
+ rectype = GET_LE_U_4(hdr->pkt_rectype);
+ switch (rectype) {
+
+ case PKT_REC_NONE:
+ ND_PRINT("no data");
+ break;
+
+ case PKT_REC_PACKET:
+ printer = lookup_printer(dlt);
+ if (printer != NULL) {
+ nhdr = *h;
+ nhdr.caplen = caplen;
+ nhdr.len = length;
+ printer(ndo, &nhdr, p);
+ hdrlen += ndo->ndo_ll_hdr_len;
+ } 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;
+ }
+
+ ndo->ndo_ll_hdr_len += hdrlen;
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+}
+#endif /* DLT_PKTAP */