diff options
Diffstat (limited to 'freebsd/contrib/tcpdump/print-zeromq.c')
| -rw-r--r-- | freebsd/contrib/tcpdump/print-zeromq.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/freebsd/contrib/tcpdump/print-zeromq.c b/freebsd/contrib/tcpdump/print-zeromq.c new file mode 100644 index 00000000..ffd90bc1 --- /dev/null +++ b/freebsd/contrib/tcpdump/print-zeromq.c @@ -0,0 +1,150 @@ +#include <machine/rtems-bsd-user-space.h> + +/* + * 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); +} + |