mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-11-24 02:23:27 +08:00
b5cbb4d2bb
This trivial change compiles fine with GCC 7.5.0 on Linux and Clang 10.0.1 on FreeBSD, so let's not run the full round of CI this time.
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Secure Shell (SSH) printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include "netdissect-ctype.h"
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#include "netdissect.h"
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#include "extract.h"
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static int
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ssh_print_version(netdissect_options *ndo, const u_char *pptr, u_int len)
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{
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u_int idx = 0;
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if ( GET_U_1(pptr+idx) != 'S' )
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return 0;
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idx++;
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if ( GET_U_1(pptr+idx) != 'S' )
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return 0;
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idx++;
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if ( GET_U_1(pptr+idx) != 'H' )
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return 0;
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idx++;
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if ( GET_U_1(pptr+idx) != '-' )
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return 0;
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idx++;
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while (idx < len) {
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u_char c;
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c = GET_U_1(pptr + idx);
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if (c == '\n') {
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/*
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* LF without CR; end of line.
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* Skip the LF and print the line, with the
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* exception of the LF.
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*/
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goto print;
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} else if (c == '\r') {
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/* CR - any LF? */
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if ((idx+1) >= len) {
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/* not in this packet */
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goto trunc;
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}
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if (GET_U_1(pptr + idx + 1) == '\n') {
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/*
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* CR-LF; end of line.
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* Skip the CR-LF and print the line, with
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* the exception of the CR-LF.
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*/
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goto print;
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}
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/*
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* CR followed by something else; treat this as
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* if it were binary data and don't print it.
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*/
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goto trunc;
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} else if (!ND_ASCII_ISPRINT(c) ) {
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/*
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* Not a printable ASCII character; treat this
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* as if it were binary data and don't print it.
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*/
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goto trunc;
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}
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idx++;
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}
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trunc:
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return -1;
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print:
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ND_PRINT(": ");
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nd_print_protocol_caps(ndo);
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ND_PRINT(": %.*s", (int)idx, pptr);
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return idx;
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}
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void
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ssh_print(netdissect_options *ndo, const u_char *pptr, u_int len)
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{
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ndo->ndo_protocol = "ssh";
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ssh_print_version(ndo, pptr, len);
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}
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