create project

print-ipcomp.c

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+/*
+ * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
+ *	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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <netdissect-stdinc.h>
+
+struct ipcomp {
+	uint8_t comp_nxt;	/* Next Header */
+	uint8_t comp_flags;	/* Length of data, in 32bit */
+	uint16_t comp_cpi;	/* Compression parameter index */
+};
+
+#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
+#include <zlib.h>
+#endif
+
+#include "netdissect.h"
+#include "extract.h"
+
+int
+ipcomp_print(netdissect_options *ndo, register const u_char *bp, int *nhdr _U_)
+{
+	register const struct ipcomp *ipcomp;
+	register const u_char *ep;
+	uint16_t cpi;
+#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
+	int advance;
+#endif
+
+	ipcomp = (const struct ipcomp *)bp;
+	cpi = EXTRACT_16BITS(&ipcomp->comp_cpi);
+
+	/* 'ep' points to the end of available data. */
+	ep = ndo->ndo_snapend;
+
+	if ((const u_char *)(ipcomp + 1) >= ep - sizeof(struct ipcomp)) {
+		ND_PRINT((ndo, "[|IPCOMP]"));
+		goto fail;
+	}
+	ND_PRINT((ndo, "IPComp(cpi=0x%04x)", cpi));
+
+#if defined(HAVE_LIBZ) && defined(HAVE_ZLIB_H)
+	if (1)
+		goto fail;
+
+	/*
+	 * We may want to decompress the packet here.  Packet buffer
+	 * management is a headache (if we decompress, packet will become
+	 * larger).
+	 */
+	if (nhdr)
+		*nhdr = ipcomp->comp_nxt;
+	advance = sizeof(struct ipcomp);
+
+	ND_PRINT((ndo, ": "));
+	return advance;
+
+#endif
+fail:
+	return -1;
+}