Vendor import of tcpdump 4.4.0.

1 files changed, 148 insertions, 0 deletions

diff --git a/print-zeromq.c b/print-zeromq.c
new file mode 100644
index 0000000..d5ac4bd
--- /dev/null
+++ b/print-zeromq.c
@@ -0,0 +1,148 @@
+/*
+ * This file implements decoding of ZeroMQ network protocol(s).
+ *
+ *
+ * Copyright (c) 2013 The TCPDUMP project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <tcpdump-stdinc.h>
+
+#include <stdio.h>
+
+#include "interface.h"
+#include "extract.h"
+
+/* Maximum number of ZMTP/1.0 frame body bytes (without the flags) to dump in
+ * hex and ASCII under a single "-v" flag.
+ */
+#define VBYTES 128
+
+/*
+ * Below is an excerpt from the "13/ZMTP" specification:
+ *
+ * A ZMTP message consists of 1 or more frames.
+ *
+ * A ZMTP frame consists of a length, followed by a flags field and a frame
+ * body of (length - 1) octets. Note: the length includes the flags field, so
+ * an empty frame has a length of 1.
+ *
+ * For frames with a length of 1 to 254 octets, the length SHOULD BE encoded
+ * as a single octet. The minimum valid length of a frame is 1 octet, thus a
+ * length of 0 is invalid and such frames SHOULD be discarded silently.
+ *
+ * For frames with lengths of 255 and greater, the length SHALL BE encoded as
+ * a single octet with the value 255, followed by the length encoded as a
+ * 64-bit unsigned integer in network byte order. For frames with lengths of
+ * 1 to 254 octets this encoding MAY be also used.
+ *
+ * The flags field consists of a single octet containing various control
+ * flags. Bit 0 is the least significant bit.
+ *
+ * - Bit 0 (MORE): More frames to follow. A value of 0 indicates that there
+ *   are no more frames to follow. A value of 1 indicates that more frames
+ *   will follow. On messages consisting of a single frame the MORE flag MUST
+ *   be 0.
+ *
+ * - Bits 1-7: Reserved. Bits 1-7 are reserved for future use and SHOULD be
+ *   zero.
+ */
+
+static const u_char *
+zmtp1_print_frame(const u_char *cp, const u_char *ep) {
+	u_int64_t body_len_declared, body_len_captured, header_len;
+	u_int8_t flags;
+
+	printf("\n\t");
+	TCHECK2(*cp, 1); /* length/0xFF */
+
+	if (cp[0] != 0xFF) {
+		header_len = 1; /* length */
+		body_len_declared = cp[0];
+		if (body_len_declared == 0)
+			return cp + header_len; /* skip to next frame */
+		printf(" frame flags+body  (8-bit) length %"PRIu8"", cp[0]);
+		TCHECK2(*cp, header_len + 1); /* length, flags */
+		flags = cp[1];
+	} else {
+		header_len = 1 + 8; /* 0xFF, length */
+		printf(" frame flags+body (64-bit) length");
+		TCHECK2(*cp, header_len); /* 0xFF, length */
+		body_len_declared = EXTRACT_64BITS(cp + 1);
+		if (body_len_declared == 0)
+			return cp + header_len; /* skip to next frame */
+		printf(" %"PRIu64"", body_len_declared);
+		TCHECK2(*cp, header_len + 1); /* 0xFF, length, flags */
+		flags = cp[9];
+	}
+
+	body_len_captured = ep - cp - header_len;
+	if (body_len_declared > body_len_captured)
+		printf(" (%"PRIu64" captured)", body_len_captured);
+	printf(", flags 0x%02"PRIx8"", flags);
+
+	if (vflag) {
+		u_int64_t body_len_printed = MIN(body_len_captured, body_len_declared);
+
+		printf(" (%s|%s|%s|%s|%s|%s|%s|%s)",
+			flags & 0x80 ? "MBZ" : "-",
+			flags & 0x40 ? "MBZ" : "-",
+			flags & 0x20 ? "MBZ" : "-",
+			flags & 0x10 ? "MBZ" : "-",
+			flags & 0x08 ? "MBZ" : "-",
+			flags & 0x04 ? "MBZ" : "-",
+			flags & 0x02 ? "MBZ" : "-",
+			flags & 0x01 ? "MORE" : "-");
+
+		if (vflag == 1)
+			body_len_printed = MIN(VBYTES + 1, body_len_printed);
+		if (body_len_printed > 1) {
+			printf(", first %"PRIu64" byte(s) of body:", body_len_printed - 1);
+			hex_and_ascii_print("\n\t ", cp + header_len + 1, body_len_printed - 1);
+			printf("\n");
+		}
+	}
+
+	TCHECK2(*cp, header_len + body_len_declared); /* Next frame within the buffer ? */
+	return cp + header_len + body_len_declared;
+
+trunc:
+	printf(" [|zmtp1]");
+	return ep;
+}
+
+void
+zmtp1_print(const u_char *cp, u_int len) {
+	const u_char *ep = MIN(snapend, cp + len);
+
+	printf(": ZMTP/1.0");
+	while (cp < ep)
+		cp = zmtp1_print_frame(cp, ep);
+}
+