Add tcpdump and libpcap.

- Update the file builder generator to handle generator specific cflags and
  includes. The tcpdump and libpcap have localised headers and need specific
  headers paths to see them. There are also module specific flags and these
  need to be passed to the lex and yacc generators.

- Add the tcpdump support.

1 files changed, 620 insertions, 0 deletions

diff --git a/freebsd/contrib/libpcap/sf-pcap.c b/freebsd/contrib/libpcap/sf-pcap.c
new file mode 100644
index 00000000..6f967c58
--- /dev/null
+++ b/freebsd/contrib/libpcap/sf-pcap.c
@@ -0,0 +1,620 @@
+#include <machine/rtems-bsd-user-space.h>
+
+/*
+ * Copyright (c) 1993, 1994, 1995, 1996, 1997
+ *	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.
+ *
+ * sf-pcap.c - libpcap-file-format-specific code from savefile.c
+ *	Extraction/creation by Jeffrey Mogul, DECWRL
+ *	Modified by Steve McCanne, LBL.
+ *
+ * Used to save the received packet headers, after filtering, to
+ * a file, and then read them later.
+ * The first record in the file contains saved values for the machine
+ * dependent values so we can print the dump file on any architecture.
+ */
+
+#ifndef lint
+static const char rcsid[] _U_ =
+    "@(#) $Header$ (LBL)";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef WIN32
+#include <pcap-stdinc.h>
+#else /* WIN32 */
+#if HAVE_INTTYPES_H
+#include <inttypes.h>
+#elif HAVE_STDINT_H
+#include <stdint.h>
+#endif
+#ifdef HAVE_SYS_BITYPES_H
+#include <sys/bitypes.h>
+#endif
+#include <rtems/bsd/sys/types.h>
+#endif /* WIN32 */
+
+#include <errno.h>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "pcap-int.h"
+
+#include "pcap-common.h"
+
+#ifdef HAVE_OS_PROTO_H
+#include "os-proto.h"
+#endif
+
+#include "sf-pcap.h"
+
+/*
+ * Setting O_BINARY on DOS/Windows is a bit tricky
+ */
+#if defined(WIN32)
+  #define SET_BINMODE(f)  _setmode(_fileno(f), _O_BINARY)
+#elif defined(MSDOS)
+  #if defined(__HIGHC__)
+  #define SET_BINMODE(f)  setmode(f, O_BINARY)
+  #else
+  #define SET_BINMODE(f)  setmode(fileno(f), O_BINARY)
+  #endif
+#endif
+
+/*
+ * Standard libpcap format.
+ */
+#define TCPDUMP_MAGIC		0xa1b2c3d4
+
+/*
+ * Alexey Kuznetzov's modified libpcap format.
+ */
+#define KUZNETZOV_TCPDUMP_MAGIC	0xa1b2cd34
+
+/*
+ * Reserved for Francisco Mesquita <francisco.mesquita@radiomovel.pt>
+ * for another modified format.
+ */
+#define FMESQUITA_TCPDUMP_MAGIC	0xa1b234cd
+
+/*
+ * Navtel Communcations' format, with nanosecond timestamps,
+ * as per a request from Dumas Hwang <dumas.hwang@navtelcom.com>.
+ */
+#define NAVTEL_TCPDUMP_MAGIC	0xa12b3c4d
+
+/*
+ * Normal libpcap format, except for seconds/nanoseconds timestamps,
+ * as per a request by Ulf Lamping <ulf.lamping@web.de>
+ */
+#define NSEC_TCPDUMP_MAGIC	0xa1b23c4d
+
+/*
+ * Mechanism for storing information about a capture in the upper
+ * 6 bits of a linktype value in a capture file.
+ *
+ * LT_LINKTYPE_EXT(x) extracts the additional information.
+ *
+ * The rest of the bits are for a value describing the link-layer
+ * value.  LT_LINKTYPE(x) extracts that value.
+ */
+#define LT_LINKTYPE(x)		((x) & 0x03FFFFFF)
+#define LT_LINKTYPE_EXT(x)	((x) & 0xFC000000)
+
+static int pcap_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char **datap);
+
+/*
+ * Check whether this is a pcap savefile and, if it is, extract the
+ * relevant information from the header.
+ */
+int
+pcap_check_header(pcap_t *p, bpf_u_int32 magic, FILE *fp, char *errbuf)
+{
+	struct pcap_file_header hdr;
+	size_t amt_read;
+
+	/*
+	 * Check whether the first 4 bytes of the file are the magic
+	 * number for a pcap savefile, or for a byte-swapped pcap
+	 * savefile.
+	 */
+	if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC) {
+		magic = SWAPLONG(magic);
+		if (magic != TCPDUMP_MAGIC && magic != KUZNETZOV_TCPDUMP_MAGIC)
+			return (0);	/* nope */
+		p->sf.swapped = 1;
+	}
+
+	/*
+	 * They are.  Put the magic number in the header, and read
+	 * the rest of the header.
+	 */
+	hdr.magic = magic;
+	amt_read = fread(((char *)&hdr) + sizeof hdr.magic, 1,
+	    sizeof(hdr) - sizeof(hdr.magic), fp);
+	if (amt_read != sizeof(hdr) - sizeof(hdr.magic)) {
+		if (ferror(fp)) {
+			snprintf(errbuf, PCAP_ERRBUF_SIZE,
+			    "error reading dump file: %s",
+			    pcap_strerror(errno));
+		} else {
+			snprintf(errbuf, PCAP_ERRBUF_SIZE,
+			    "truncated dump file; tried to read %lu file header bytes, only got %lu",
+			    (unsigned long)sizeof(hdr),
+			    (unsigned long)amt_read);
+		}
+		return (-1);
+	}
+
+	/*
+	 * If it's a byte-swapped capture file, byte-swap the header.
+	 */
+	if (p->sf.swapped) {
+		hdr.version_major = SWAPSHORT(hdr.version_major);
+		hdr.version_minor = SWAPSHORT(hdr.version_minor);
+		hdr.thiszone = SWAPLONG(hdr.thiszone);
+		hdr.sigfigs = SWAPLONG(hdr.sigfigs);
+		hdr.snaplen = SWAPLONG(hdr.snaplen);
+		hdr.linktype = SWAPLONG(hdr.linktype);
+	}
+
+	if (hdr.version_major < PCAP_VERSION_MAJOR) {
+		snprintf(errbuf, PCAP_ERRBUF_SIZE,
+		    "archaic pcap savefile format");
+		return (-1);
+	}
+	p->sf.version_major = hdr.version_major;
+	p->sf.version_minor = hdr.version_minor;
+	p->tzoff = hdr.thiszone;
+	p->snapshot = hdr.snaplen;
+	p->linktype = linktype_to_dlt(LT_LINKTYPE(hdr.linktype));
+	p->linktype_ext = LT_LINKTYPE_EXT(hdr.linktype);
+
+	p->sf.next_packet_op = pcap_next_packet;
+
+	/*
+	 * We interchanged the caplen and len fields at version 2.3,
+	 * in order to match the bpf header layout.  But unfortunately
+	 * some files were written with version 2.3 in their headers
+	 * but without the interchanged fields.
+	 *
+	 * In addition, DG/UX tcpdump writes out files with a version
+	 * number of 543.0, and with the caplen and len fields in the
+	 * pre-2.3 order.
+	 */
+	switch (hdr.version_major) {
+
+	case 2:
+		if (hdr.version_minor < 3)
+			p->sf.lengths_swapped = SWAPPED;
+		else if (hdr.version_minor == 3)
+			p->sf.lengths_swapped = MAYBE_SWAPPED;
+		else
+			p->sf.lengths_swapped = NOT_SWAPPED;
+		break;
+
+	case 543:
+		p->sf.lengths_swapped = SWAPPED;
+		break;
+
+	default:
+		p->sf.lengths_swapped = NOT_SWAPPED;
+		break;
+	}
+
+	if (magic == KUZNETZOV_TCPDUMP_MAGIC) {
+		/*
+		 * XXX - the patch that's in some versions of libpcap
+		 * changes the packet header but not the magic number,
+		 * and some other versions with this magic number have
+		 * some extra debugging information in the packet header;
+		 * we'd have to use some hacks^H^H^H^H^Hheuristics to
+		 * detect those variants.
+		 *
+		 * Ethereal does that, but it does so by trying to read
+		 * the first two packets of the file with each of the
+		 * record header formats.  That currently means it seeks
+		 * backwards and retries the reads, which doesn't work
+		 * on pipes.  We want to be able to read from a pipe, so
+		 * that strategy won't work; we'd have to buffer some
+		 * data ourselves and read from that buffer in order to
+		 * make that work.
+		 */
+		p->sf.hdrsize = sizeof(struct pcap_sf_patched_pkthdr);
+
+		if (p->linktype == DLT_EN10MB) {
+			/*
+			 * This capture might have been done in raw mode
+			 * or cooked mode.
+			 *
+			 * If it was done in cooked mode, p->snapshot was
+			 * passed to recvfrom() as the buffer size, meaning
+			 * that the most packet data that would be copied
+			 * would be p->snapshot.  However, a faked Ethernet
+			 * header would then have been added to it, so the
+			 * most data that would be in a packet in the file
+			 * would be p->snapshot + 14.
+			 *
+			 * We can't easily tell whether the capture was done
+			 * in raw mode or cooked mode, so we'll assume it was
+			 * cooked mode, and add 14 to the snapshot length.
+			 * That means that, for a raw capture, the snapshot
+			 * length will be misleading if you use it to figure
+			 * out why a capture doesn't have all the packet data,
+			 * but there's not much we can do to avoid that.
+			 */
+			p->snapshot += 14;
+		}
+	} else
+		p->sf.hdrsize = sizeof(struct pcap_sf_pkthdr);
+
+	/*
+	 * Allocate a buffer for the packet data.
+	 */
+	p->bufsize = p->snapshot;
+	if (p->bufsize <= 0) {
+		/*
+		 * Bogus snapshot length; use 64KiB as a fallback.
+		 */
+		p->bufsize = 65536;
+	}
+	p->buffer = malloc(p->bufsize);
+	if (p->buffer == NULL) {
+		snprintf(errbuf, PCAP_ERRBUF_SIZE, "out of memory");
+		return (-1);
+	}
+
+	return (1);
+}
+
+/*
+ * Read and return the next packet from the savefile.  Return the header
+ * in hdr and a pointer to the contents in data.  Return 0 on success, 1
+ * if there were no more packets, and -1 on an error.
+ */
+static int
+pcap_next_packet(pcap_t *p, struct pcap_pkthdr *hdr, u_char **data)
+{
+	struct pcap_sf_patched_pkthdr sf_hdr;
+	FILE *fp = p->sf.rfile;
+	size_t amt_read;
+	bpf_u_int32 t;
+
+	/*
+	 * Read the packet header; the structure we use as a buffer
+	 * is the longer structure for files generated by the patched
+	 * libpcap, but if the file has the magic number for an
+	 * unpatched libpcap we only read as many bytes as the regular
+	 * header has.
+	 */
+	amt_read = fread(&sf_hdr, 1, p->sf.hdrsize, fp);
+	if (amt_read != p->sf.hdrsize) {
+		if (ferror(fp)) {
+			snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+			    "error reading dump file: %s",
+			    pcap_strerror(errno));
+			return (-1);
+		} else {
+			if (amt_read != 0) {
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "truncated dump file; tried to read %lu header bytes, only got %lu",
+				    (unsigned long)p->sf.hdrsize,
+				    (unsigned long)amt_read);
+				return (-1);
+			}
+			/* EOF */
+			return (1);
+		}
+	}
+
+	if (p->sf.swapped) {
+		/* these were written in opposite byte order */
+		hdr->caplen = SWAPLONG(sf_hdr.caplen);
+		hdr->len = SWAPLONG(sf_hdr.len);
+		hdr->ts.tv_sec = SWAPLONG(sf_hdr.ts.tv_sec);
+		hdr->ts.tv_usec = SWAPLONG(sf_hdr.ts.tv_usec);
+	} else {
+		hdr->caplen = sf_hdr.caplen;
+		hdr->len = sf_hdr.len;
+		hdr->ts.tv_sec = sf_hdr.ts.tv_sec;
+		hdr->ts.tv_usec = sf_hdr.ts.tv_usec;
+	}
+	/* Swap the caplen and len fields, if necessary. */
+	switch (p->sf.lengths_swapped) {
+
+	case NOT_SWAPPED:
+		break;
+
+	case MAYBE_SWAPPED:
+		if (hdr->caplen <= hdr->len) {
+			/*
+			 * The captured length is <= the actual length,
+			 * so presumably they weren't swapped.
+			 */
+			break;
+		}
+		/* FALLTHROUGH */
+
+	case SWAPPED:
+		t = hdr->caplen;
+		hdr->caplen = hdr->len;
+		hdr->len = t;
+		break;
+	}
+
+	if (hdr->caplen > p->bufsize) {
+		/*
+		 * This can happen due to Solaris 2.3 systems tripping
+		 * over the BUFMOD problem and not setting the snapshot
+		 * correctly in the savefile header.  If the caplen isn't
+		 * grossly wrong, try to salvage.
+		 */
+		static u_char *tp = NULL;
+		static size_t tsize = 0;
+
+		if (hdr->caplen > 65535) {
+			snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+			    "bogus savefile header");
+			return (-1);
+		}
+
+		if (tsize < hdr->caplen) {
+			tsize = ((hdr->caplen + 1023) / 1024) * 1024;
+			if (tp != NULL)
+				free((u_char *)tp);
+			tp = (u_char *)malloc(tsize);
+			if (tp == NULL) {
+				tsize = 0;
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "BUFMOD hack malloc");
+				return (-1);
+			}
+		}
+		amt_read = fread((char *)tp, 1, hdr->caplen, fp);
+		if (amt_read != hdr->caplen) {
+			if (ferror(fp)) {
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "error reading dump file: %s",
+				    pcap_strerror(errno));
+			} else {
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "truncated dump file; tried to read %u captured bytes, only got %lu",
+				    hdr->caplen, (unsigned long)amt_read);
+			}
+			return (-1);
+		}
+		/*
+		 * We can only keep up to p->bufsize bytes.  Since
+		 * caplen > p->bufsize is exactly how we got here,
+		 * we know we can only keep the first p->bufsize bytes
+		 * and must drop the remainder.  Adjust caplen accordingly,
+		 * so we don't get confused later as to how many bytes we
+		 * have to play with.
+		 */
+		hdr->caplen = p->bufsize;
+		memcpy(p->buffer, (char *)tp, p->bufsize);
+	} else {
+		/* read the packet itself */
+		amt_read = fread(p->buffer, 1, hdr->caplen, fp);
+		if (amt_read != hdr->caplen) {
+			if (ferror(fp)) {
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "error reading dump file: %s",
+				    pcap_strerror(errno));
+			} else {
+				snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+				    "truncated dump file; tried to read %u captured bytes, only got %lu",
+				    hdr->caplen, (unsigned long)amt_read);
+			}
+			return (-1);
+		}
+	}
+	*data = p->buffer;
+
+	if (p->sf.swapped) {
+		/*
+		 * Convert pseudo-headers from the byte order of
+		 * the host on which the file was saved to our
+		 * byte order, as necessary.
+		 */
+		switch (p->linktype) {
+
+		case DLT_USB_LINUX:
+			swap_linux_usb_header(hdr, *data, 0);
+			break;
+
+		case DLT_USB_LINUX_MMAPPED:
+			swap_linux_usb_header(hdr, *data, 1);
+			break;
+		}
+	}
+
+	return (0);
+}
+
+static int
+sf_write_header(FILE *fp, int linktype, int thiszone, int snaplen)
+{
+	struct pcap_file_header hdr;
+
+	hdr.magic = TCPDUMP_MAGIC;
+	hdr.version_major = PCAP_VERSION_MAJOR;
+	hdr.version_minor = PCAP_VERSION_MINOR;
+
+	hdr.thiszone = thiszone;
+	hdr.snaplen = snaplen;
+	hdr.sigfigs = 0;
+	hdr.linktype = linktype;
+
+	if (fwrite((char *)&hdr, sizeof(hdr), 1, fp) != 1)
+		return (-1);
+
+	return (0);
+}
+
+/*
+ * Output a packet to the initialized dump file.
+ */
+void
+pcap_dump(u_char *user, const struct pcap_pkthdr *h, const u_char *sp)
+{
+	register FILE *f;
+	struct pcap_sf_pkthdr sf_hdr;
+
+	f = (FILE *)user;
+	sf_hdr.ts.tv_sec  = h->ts.tv_sec;
+	sf_hdr.ts.tv_usec = h->ts.tv_usec;
+	sf_hdr.caplen     = h->caplen;
+	sf_hdr.len        = h->len;
+	/* XXX we should check the return status */
+	(void)fwrite(&sf_hdr, sizeof(sf_hdr), 1, f);
+	(void)fwrite(sp, h->caplen, 1, f);
+}
+
+static pcap_dumper_t *
+pcap_setup_dump(pcap_t *p, int linktype, FILE *f, const char *fname)
+{
+
+#if defined(WIN32) || defined(MSDOS)
+	/*
+	 * If we're writing to the standard output, put it in binary
+	 * mode, as savefiles are binary files.
+	 *
+	 * Otherwise, we turn off buffering.
+	 * XXX - why?  And why not on the standard output?
+	 */
+	if (f == stdout)
+		SET_BINMODE(f);
+	else
+		setbuf(f, NULL);
+#endif
+	if (sf_write_header(f, linktype, p->tzoff, p->snapshot) == -1) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Can't write to %s: %s",
+		    fname, pcap_strerror(errno));
+		if (f != stdout)
+			(void)fclose(f);
+		return (NULL);
+	}
+	return ((pcap_dumper_t *)f);
+}
+
+/*
+ * Initialize so that sf_write() will output to the file named 'fname'.
+ */
+pcap_dumper_t *
+pcap_dump_open(pcap_t *p, const char *fname)
+{
+	FILE *f;
+	int linktype;
+
+	/*
+	 * If this pcap_t hasn't been activated, it doesn't have a
+	 * link-layer type, so we can't use it.
+	 */
+	if (!p->activated) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+		    "%s: not-yet-activated pcap_t passed to pcap_dump_open",
+		    fname);
+		return (NULL);
+	}
+	linktype = dlt_to_linktype(p->linktype);
+	if (linktype == -1) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+		    "%s: link-layer type %d isn't supported in savefiles",
+		    fname, p->linktype);
+		return (NULL);
+	}
+	linktype |= p->linktype_ext;
+
+	if (fname[0] == '-' && fname[1] == '\0') {
+		f = stdout;
+		fname = "standard output";
+	} else {
+#if !defined(WIN32) && !defined(MSDOS)
+		f = fopen(fname, "w");
+#else
+		f = fopen(fname, "wb");
+#endif
+		if (f == NULL) {
+			snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
+			    fname, pcap_strerror(errno));
+			return (NULL);
+		}
+	}
+	return (pcap_setup_dump(p, linktype, f, fname));
+}
+
+/*
+ * Initialize so that sf_write() will output to the given stream.
+ */
+pcap_dumper_t *
+pcap_dump_fopen(pcap_t *p, FILE *f)
+{	
+	int linktype;
+
+	linktype = dlt_to_linktype(p->linktype);
+	if (linktype == -1) {
+		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+		    "stream: link-layer type %d isn't supported in savefiles",
+		    p->linktype);
+		return (NULL);
+	}
+	linktype |= p->linktype_ext;
+
+	return (pcap_setup_dump(p, linktype, f, "stream"));
+}
+
+FILE *
+pcap_dump_file(pcap_dumper_t *p)
+{
+	return ((FILE *)p);
+}
+
+long
+pcap_dump_ftell(pcap_dumper_t *p)
+{
+	return (ftell((FILE *)p));
+}
+
+int
+pcap_dump_flush(pcap_dumper_t *p)
+{
+
+	if (fflush((FILE *)p) == EOF)
+		return (-1);
+	else
+		return (0);
+}
+
+void
+pcap_dump_close(pcap_dumper_t *p)
+{
+
+#ifdef notyet
+	if (ferror((FILE *)p))
+		return-an-error;
+	/* XXX should check return from fclose() too */
+#endif
+	(void)fclose((FILE *)p);
+}