*/
/* \summary: ZeroMQ Message Transport Protocol (ZMTP) printer */
+/* specification: https://rfc.zeromq.org/spec/13/ */
-#ifdef HAVE_CONFIG_H
#include <config.h>
-#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "extract.h"
-static const char tstr[] = " [|zmtp1]";
/* 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
+static const struct tok flags_bm[] = {
+ { 0x01, "MORE" },
+ { 0x02, "R1" },
+ { 0x04, "R2" },
+ { 0x08, "R3" },
+ { 0x10, "R4" },
+ { 0x20, "R5" },
+ { 0x40, "R6" },
+ { 0x80, "R7" },
+ { 0, NULL }
+};
+
/*
* Below is an excerpt from the "13/ZMTP" specification:
*
uint8_t flags;
ND_PRINT("\n\t");
- ND_TCHECK_1(cp); /* length/0xFF */
- if (EXTRACT_U_1(cp) != 0xFF) {
+ if (GET_U_1(cp) != 0xFF) { /* length/0xFF */
header_len = 1; /* length */
- body_len_declared = EXTRACT_U_1(cp);
+ body_len_declared = GET_U_1(cp);
ND_PRINT(" frame flags+body (8-bit) length %" PRIu64, body_len_declared);
} else {
header_len = 1 + 8; /* 0xFF, length */
ND_PRINT(" frame flags+body (64-bit) length");
ND_TCHECK_LEN(cp, header_len); /* 0xFF, length */
- body_len_declared = EXTRACT_BE_U_8(cp + 1);
+ body_len_declared = GET_BE_U_8(cp + 1);
ND_PRINT(" %" PRIu64, body_len_declared);
}
if (body_len_declared == 0)
return cp + header_len; /* skip to the next frame */
ND_TCHECK_LEN(cp, header_len + 1); /* ..., flags */
- flags = EXTRACT_U_1(cp + header_len);
+ flags = GET_U_1(cp + header_len);
body_len_captured = ep - cp - header_len;
if (body_len_declared > body_len_captured)
ND_PRINT(", flags 0x%02x", flags);
if (ndo->ndo_vflag) {
- uint64_t body_len_printed = min(body_len_captured, body_len_declared);
-
- ND_PRINT(" (%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" : "-");
+ uint64_t body_len_printed = ND_MIN(body_len_captured, body_len_declared);
+ ND_PRINT(" (%s)", bittok2str(flags_bm, "none", flags));
if (ndo->ndo_vflag == 1)
- body_len_printed = min(VBYTES + 1, body_len_printed);
+ body_len_printed = ND_MIN(VBYTES + 1, body_len_printed);
if (body_len_printed > 1) {
ND_PRINT(", first %" PRIu64 " byte(s) of body:", body_len_printed - 1);
hex_and_ascii_print(ndo, "\n\t ", cp + header_len + 1, body_len_printed - 1);
- ND_PRINT("\n");
}
}
return cp + body_len_declared;
trunc:
- ND_PRINT("%s", tstr);
- return ep;
+ nd_trunc_longjmp(ndo);
}
void
zmtp1_print(netdissect_options *ndo, const u_char *cp, u_int len)
{
- const u_char *ep = min(ndo->ndo_snapend, cp + len);
+ const u_char *ep = ND_MIN(ndo->ndo_snapend, cp + len);
+ ndo->ndo_protocol = "zmtp1";
ND_PRINT(": ZMTP/1.0");
while (cp < ep)
cp = zmtp1_print_frame(ndo, cp, ep);
zmtp1_print_intermediate_part(netdissect_options *ndo, const u_char *cp, const u_int len)
{
u_int frame_offset;
- uint64_t remaining_len;
+ u_int remaining_len;
- ND_TCHECK_2(cp);
- frame_offset = EXTRACT_BE_U_2(cp);
+ frame_offset = GET_BE_U_2(cp);
ND_PRINT("\n\t frame offset 0x%04x", frame_offset);
cp += 2;
- remaining_len = ndo->ndo_snapend - cp; /* without the frame length */
+ remaining_len = ND_BYTES_AVAILABLE_AFTER(cp); /* without the frame length */
if (frame_offset == 0xFFFF)
frame_offset = len - 2; /* always within the declared length */
if (frame_offset) {
ND_PRINT("\n\t frame intermediate part, %u bytes", frame_offset);
if (frame_offset > remaining_len)
- ND_PRINT(" (%"PRIu64" captured)", remaining_len);
+ ND_PRINT(" (%u captured)", remaining_len);
if (ndo->ndo_vflag) {
- uint64_t len_printed = min(frame_offset, remaining_len);
+ u_int len_printed = ND_MIN(frame_offset, remaining_len);
if (ndo->ndo_vflag == 1)
- len_printed = min(VBYTES, len_printed);
+ len_printed = ND_MIN(VBYTES, len_printed);
if (len_printed > 1) {
- ND_PRINT(", first %"PRIu64" byte(s):", len_printed);
+ ND_PRINT(", first %u byte(s):", len_printed);
hex_and_ascii_print(ndo, "\n\t ", cp, len_printed);
- ND_PRINT("\n");
}
}
}
return cp + frame_offset;
trunc:
- ND_PRINT("%s", tstr);
- return cp + len;
+ nd_trunc_longjmp(ndo);
}
void
zmtp1_datagram_print(netdissect_options *ndo, const u_char *cp, const u_int len)
{
- const u_char *ep = min(ndo->ndo_snapend, cp + len);
+ const u_char *ep = ND_MIN(ndo->ndo_snapend, cp + len);
+ ndo->ndo_protocol = "zmtp1";
cp = zmtp1_print_intermediate_part(ndo, cp, len);
while (cp < ep)
cp = zmtp1_print_frame(ndo, cp, ep);
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