3b77bfee59
svn path=/trunk/; revision=9393
751 lines
19 KiB
C
751 lines
19 KiB
C
/* util.c
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* Utility routines
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*
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* $Id: util.c,v 1.75 2003/12/21 12:19:39 ulfl Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_LIBPCAP
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#include <pcap.h>
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#endif /* HAVE_LIBPCAP */
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#include <glib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#ifdef NEED_SNPRINTF_H
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# include "snprintf.h"
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#endif
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#ifdef NEED_MKSTEMP
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#include "mkstemp.h"
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#endif
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#ifdef HAVE_IO_H
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#include <io.h>
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#ifndef __MINGW32__
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typedef int mode_t; /* for win32 */
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#endif /* __MINGW32__ */
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#endif /* HAVE_IO_H */
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#ifdef HAVE_LIBZ
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#include <zlib.h> /* to get the libz version number */
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#endif
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#ifdef HAVE_LIBPCRE
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#include <pcre.h> /* to get the libpcre version number */
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#endif /* HAVE_LIBPCRE */
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/*
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* This has to come after the include of <pcap.h>, as the include of
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* <pcap.h> might cause <winsock2.h> to be included, and if we've
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* already included <winsock.h> as a result of including <windows.h>,
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* we get a bunch of redefinitions.
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*/
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#ifdef HAVE_WINDOWS_H
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#include <windows.h>
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#endif
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#ifdef HAVE_SOME_SNMP
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#ifdef HAVE_NET_SNMP
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#include <net-snmp/version.h>
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#endif /* HAVE_NET_SNMP */
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#ifdef HAVE_UCD_SNMP
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#include <ucd-snmp/version.h>
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#endif /* HAVE_UCD_SNMP */
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#endif /* HAVE_SOME_SNMP */
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#ifdef HAVE_SYS_UTSNAME_H
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#include <sys/utsname.h>
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#endif
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#include "util.h"
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#include "pcap-util.h"
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/*
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* See whether the last line in the string goes past column 80; if so,
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* replace the blank at the specified point with a newline.
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*/
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static void
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do_word_wrap(GString *str, gint point)
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{
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char *line_begin;
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line_begin = strrchr(str->str, '\n');
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if (line_begin == NULL)
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line_begin = str->str;
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else
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line_begin++;
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if (strlen(line_begin) > 80) {
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g_assert(str->str[point] == ' ');
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str->str[point] = '\n';
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}
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}
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/*
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* Get various library compile-time versions and append them to
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* the specified GString.
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*/
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void
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get_compiled_version_info(GString *str)
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{
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gint break_point;
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g_string_append(str, "with ");
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g_string_sprintfa(str,
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#ifdef GLIB_MAJOR_VERSION
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"GLib %d.%d.%d,", GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION,
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GLIB_MICRO_VERSION);
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#else
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"GLib (version unknown),");
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#endif
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g_string_append(str, " ");
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break_point = str->len - 1;
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get_compiled_pcap_version(str);
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g_string_append(str, ",");
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do_word_wrap(str, break_point);
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g_string_append(str, " ");
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break_point = str->len - 1;
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#ifdef HAVE_LIBZ
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g_string_append(str, "with libz ");
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#ifdef ZLIB_VERSION
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g_string_append(str, ZLIB_VERSION);
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#else /* ZLIB_VERSION */
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g_string_append(str, "(version unknown)");
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#endif /* ZLIB_VERSION */
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#else /* HAVE_LIBZ */
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g_string_append(str, "without libz");
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#endif /* HAVE_LIBZ */
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g_string_append(str, ",");
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do_word_wrap(str, break_point);
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g_string_append(str, " ");
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break_point = str->len - 1;
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#ifdef HAVE_LIBPCRE
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g_string_append(str, "with libpcre ");
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#ifdef PCRE_MAJOR
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#ifdef PCRE_MINOR
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g_string_sprintfa(str, "%u.%u", PCRE_MAJOR, PCRE_MINOR);
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#else /* PCRE_MINOR */
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g_string_sprintfa(str, "%u", PCRE_MAJOR);
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#endif /* PCRE_MINOR */
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#else /* PCRE_MAJOR */
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g_string_append(str, "(version unknown)");
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#endif /* PCRE_MAJOR */
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#else /* HAVE_LIBPCRE */
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g_string_append(str, "without libpcre");
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#endif /* HAVE_LIBPCRE */
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g_string_append(str, ",");
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do_word_wrap(str, break_point);
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/* Oh, this is pretty. */
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/* Oh, ha. you think that was pretty. Try this:! --Wes */
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g_string_append(str, " ");
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break_point = str->len - 1;
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#ifdef HAVE_SOME_SNMP
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#ifdef HAVE_UCD_SNMP
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g_string_append(str, "with UCD-SNMP ");
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g_string_append(str, VersionInfo);
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#endif /* HAVE_UCD_SNMP */
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#ifdef HAVE_NET_SNMP
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g_string_append(str, "with Net-SNMP ");
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g_string_append(str, netsnmp_get_version());
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#endif /* HAVE_NET_SNMP */
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#else /* no SNMP library */
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g_string_append(str, "without UCD-SNMP or Net-SNMP");
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#endif /* HAVE_SOME_SNMP */
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g_string_append(str, ",");
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do_word_wrap(str, break_point);
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g_string_append(str, " ");
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break_point = str->len - 1;
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#ifdef HAVE_GNU_ADNS
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g_string_append(str, "with ADNS");
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#else
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g_string_append(str, "without ADNS");
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#endif /* HAVE_GNU_ADNS */
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g_string_append(str, ".");
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do_word_wrap(str, break_point);
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#ifndef HAVE_LIBPCRE
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break_point = str->len - 1;
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g_string_append(str,
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"\nNOTE: this build does not support the \"matches\" operator"
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"\nfor Ethereal filter syntax.\n");
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do_word_wrap(str, break_point);
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#endif /* HAVE_LIBPCRE */
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}
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/*
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* Get various library run-time versions, and the OS version, and append
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* them to the specified GString.
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*/
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void
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get_runtime_version_info(GString *str)
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{
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#if defined(WIN32)
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OSVERSIONINFO info;
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#elif defined(HAVE_SYS_UTSNAME_H)
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struct utsname name;
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#endif
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get_runtime_pcap_version(str);
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g_string_append(str, "on ");
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#if defined(WIN32)
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info.dwOSVersionInfoSize = sizeof info;
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if (!GetVersionEx(&info)) {
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/*
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* XXX - get the failure reason.
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*/
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g_string_append(str, "unknown Windows version");
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return;
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}
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switch (info.dwPlatformId) {
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case VER_PLATFORM_WIN32s:
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/* Shyeah, right. */
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g_string_sprintfa(str, "Windows 3.1 with Win32s");
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break;
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case VER_PLATFORM_WIN32_WINDOWS:
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/* Windows OT */
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switch (info.dwMajorVersion) {
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case 4:
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/* 3 cheers for Microsoft marketing! */
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switch (info.dwMinorVersion) {
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case 0:
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g_string_sprintfa(str, "Windows 95");
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break;
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case 10:
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g_string_sprintfa(str, "Windows 98");
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break;
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case 90:
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g_string_sprintfa(str, "Windows Me");
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break;
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default:
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g_string_sprintfa(str, "Windows OT, unknown version %lu.%lu",
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info.dwMajorVersion, info.dwMinorVersion);
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break;
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}
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break;
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default:
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g_string_sprintfa(str, "Windows OT, unknown version %lu.%lu",
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info.dwMajorVersion, info.dwMinorVersion);
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break;
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}
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break;
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case VER_PLATFORM_WIN32_NT:
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/* Windows NT */
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switch (info.dwMajorVersion) {
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case 3:
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case 4:
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g_string_sprintfa(str, "Windows NT %lu.%lu",
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info.dwMajorVersion, info.dwMinorVersion);
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break;
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case 5:
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/* 3 cheers for Microsoft marketing! */
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switch (info.dwMinorVersion) {
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case 0:
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g_string_sprintfa(str, "Windows 2000");
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break;
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case 1:
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g_string_sprintfa(str, "Windows XP");
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break;
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case 2:
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g_string_sprintfa(str, "Windows Server 2003");
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break;
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default:
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g_string_sprintfa(str, "Windows NT, unknown version %lu.%lu",
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info.dwMajorVersion, info.dwMinorVersion);
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break;
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}
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break;
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default:
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g_string_sprintfa(str, "Windows NT, unknown version %lu.%lu",
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info.dwMajorVersion, info.dwMinorVersion);
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break;
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}
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break;
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default:
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g_string_sprintfa(str, "Unknown Windows platform %lu version %lu.%lu",
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info.dwPlatformId, info.dwMajorVersion, info.dwMinorVersion);
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break;
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}
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if (info.szCSDVersion[0] != '\0')
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g_string_sprintfa(str, " %s", info.szCSDVersion);
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g_string_sprintfa(str, ", build %lu", info.dwBuildNumber);
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#elif defined(HAVE_SYS_UTSNAME_H)
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/*
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* We have <sys/utsname.h>, so we assume we have "uname()".
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*/
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if (uname(&name) < 0) {
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g_string_sprintfa(str, "unknown OS version (uname failed - %s)",
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strerror(errno));
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return;
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}
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if (strcmp(name.sysname, "AIX") == 0) {
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/*
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* Yay, IBM! Thanks for doing something different
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* from most of the other UNIXes out there, and
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* making "name.version" apparently be the major
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* version number and "name.release" be the minor
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* version number.
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*/
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g_string_sprintfa(str, "%s %s.%s", name.sysname, name.version,
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name.release);
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} else {
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/*
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* XXX - get "version" on any other platforms?
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*
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* On Digital/Tru65 UNIX, it's something unknown.
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* On Solaris, it's some kind of build information.
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* On HP-UX, it appears to be some sort of subrevision
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* thing.
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*/
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g_string_sprintfa(str, "%s %s", name.sysname, name.release);
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}
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#else
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g_string_append(str, "an unknown OS");
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#endif
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}
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/*
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* Collect command-line arguments as a string consisting of the arguments,
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* separated by spaces.
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*/
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char *
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get_args_as_string(int argc, char **argv, int optind)
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{
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int len;
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int i;
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char *argstring;
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/*
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* Find out how long the string will be.
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*/
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len = 0;
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for (i = optind; i < argc; i++) {
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len += strlen(argv[i]);
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len++; /* space, or '\0' if this is the last argument */
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}
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/*
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* Allocate the buffer for the string.
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*/
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argstring = g_malloc(len);
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/*
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* Now construct the string.
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*/
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strcpy(argstring, "");
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i = optind;
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for (;;) {
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strcat(argstring, argv[i]);
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i++;
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if (i == argc)
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break;
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strcat(argstring, " ");
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}
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return argstring;
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}
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static char *
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setup_tmpdir(char *dir)
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{
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int len = strlen(dir);
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char *newdir;
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/* Append slash if necessary */
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if (dir[len - 1] == '/') {
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newdir = dir;
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}
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else {
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newdir = g_malloc(len + 2);
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strcpy(newdir, dir);
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strcat(newdir, "/");
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}
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return newdir;
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}
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static int
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try_tempfile(char *namebuf, int namebuflen, const char *dir, const char *pfx)
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{
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static const char suffix[] = "XXXXXXXXXX";
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int namelen = strlen(dir) + strlen(pfx) + sizeof suffix;
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mode_t old_umask;
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int tmp_fd;
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if (namebuflen < namelen) {
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/* Stick in a truncated name, so that if this error is
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reported with the file name, you at least get
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something. */
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snprintf(namebuf, namebuflen, "%s%s%s", dir, pfx, suffix);
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errno = ENAMETOOLONG;
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return -1;
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}
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strcpy(namebuf, dir);
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strcat(namebuf, pfx);
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strcat(namebuf, suffix);
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/* The Single UNIX Specification doesn't say that "mkstemp()"
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creates the temporary file with mode rw-------, so we
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won't assume that all UNIXes will do so; instead, we set
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the umask to 0077 to take away all group and other
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permissions, attempt to create the file, and then put
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the umask back. */
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old_umask = umask(0077);
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tmp_fd = mkstemp(namebuf);
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umask(old_umask);
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return tmp_fd;
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}
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static char *tmpdir = NULL;
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#ifdef WIN32
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static char *temp = NULL;
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#endif
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static char *E_tmpdir;
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#ifndef P_tmpdir
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#define P_tmpdir "/var/tmp"
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#endif
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int
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create_tempfile(char *namebuf, int namebuflen, const char *pfx)
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{
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char *dir;
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int fd;
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static gboolean initialized;
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if (!initialized) {
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if ((dir = getenv("TMPDIR")) != NULL)
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tmpdir = setup_tmpdir(dir);
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#ifdef WIN32
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if ((dir = getenv("TEMP")) != NULL)
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temp = setup_tmpdir(dir);
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#endif
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E_tmpdir = setup_tmpdir(P_tmpdir);
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initialized = TRUE;
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}
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if (tmpdir != NULL) {
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fd = try_tempfile(namebuf, namebuflen, tmpdir, pfx);
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if (fd != -1)
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return fd;
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}
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#ifdef WIN32
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if (temp != NULL) {
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fd = try_tempfile(namebuf, namebuflen, temp, pfx);
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if (fd != -1)
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return fd;
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}
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#endif
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fd = try_tempfile(namebuf, namebuflen, E_tmpdir, pfx);
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if (fd != -1)
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return fd;
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return try_tempfile(namebuf, namebuflen, "/tmp", pfx);
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}
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/* ASCII/EBCDIC conversion tables from
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* http://www.room42.com/store/computer_center/code_tables.shtml
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*/
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#if 0
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static guint8 ASCII_translate_EBCDIC [ 256 ] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
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0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
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0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D, 0x4D,
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0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
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0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
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0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
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0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8,
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0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
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0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
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0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
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|
0x7D, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
|
|
0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
|
|
0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
|
|
0xA8, 0xA9, 0xC0, 0x6A, 0xD0, 0xA1, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B,
|
|
0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B, 0x4B
|
|
};
|
|
|
|
void
|
|
ASCII_to_EBCDIC(guint8 *buf, guint bytes)
|
|
{
|
|
guint i;
|
|
guint8 *bufptr;
|
|
|
|
bufptr = buf;
|
|
|
|
for (i = 0; i < bytes; i++, bufptr++) {
|
|
*bufptr = ASCII_translate_EBCDIC[*bufptr];
|
|
}
|
|
}
|
|
|
|
guint8
|
|
ASCII_to_EBCDIC1(guint8 c)
|
|
{
|
|
return ASCII_translate_EBCDIC[c];
|
|
}
|
|
#endif
|
|
|
|
static guint8 EBCDIC_translate_ASCII [ 256 ] = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
|
|
0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
|
|
0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
|
|
0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
|
|
0x2E, 0x2E, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
|
|
0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x2E, 0x3F,
|
|
0x20, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x2E, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
|
|
0x26, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
|
|
0x2D, 0x2F, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
|
|
0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
|
|
0x2E, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
|
|
0x69, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71,
|
|
0x72, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
|
|
0x7A, 0x2E, 0x2E, 0x2E, 0x5B, 0x2E, 0x2E,
|
|
0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x2E, 0x2E, 0x2E, 0x2E, 0x5D, 0x2E, 0x2E,
|
|
0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
|
|
0x49, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51,
|
|
0x52, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x5C, 0x2E, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
|
|
0x5A, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E,
|
|
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
|
|
0x39, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E, 0x2E
|
|
};
|
|
|
|
void
|
|
EBCDIC_to_ASCII(guint8 *buf, guint bytes)
|
|
{
|
|
guint i;
|
|
guint8 *bufptr;
|
|
|
|
bufptr = buf;
|
|
|
|
for (i = 0; i < bytes; i++, bufptr++) {
|
|
*bufptr = EBCDIC_translate_ASCII[*bufptr];
|
|
}
|
|
}
|
|
|
|
guint8
|
|
EBCDIC_to_ASCII1(guint8 c)
|
|
{
|
|
return EBCDIC_translate_ASCII[c];
|
|
}
|
|
|
|
/* Compute the difference between two seconds/microseconds time stamps. */
|
|
void
|
|
compute_timestamp_diff(gint *diffsec, gint *diffusec,
|
|
guint32 sec1, guint32 usec1, guint32 sec2, guint32 usec2)
|
|
{
|
|
if (sec1 == sec2) {
|
|
/* The seconds part of the first time is the same as the seconds
|
|
part of the second time, so if the microseconds part of the first
|
|
time is less than the microseconds part of the second time, the
|
|
first time is before the second time. The microseconds part of
|
|
the delta should just be the difference between the microseconds
|
|
part of the first time and the microseconds part of the second
|
|
time; don't adjust the seconds part of the delta, as it's OK if
|
|
the microseconds part is negative. */
|
|
|
|
*diffsec = sec1 - sec2;
|
|
*diffusec = usec1 - usec2;
|
|
} else if (sec1 <= sec2) {
|
|
/* The seconds part of the first time is less than the seconds part
|
|
of the second time, so the first time is before the second time.
|
|
|
|
Both the "seconds" and "microseconds" value of the delta
|
|
should have the same sign, so if the difference between the
|
|
microseconds values would be *positive*, subtract 1,000,000
|
|
from it, and add one to the seconds value. */
|
|
*diffsec = sec1 - sec2;
|
|
if (usec2 >= usec1) {
|
|
*diffusec = usec1 - usec2;
|
|
} else {
|
|
*diffusec = (usec1 - 1000000) - usec2;
|
|
(*diffsec)++;
|
|
}
|
|
} else {
|
|
/* Oh, good, we're not caught in a chronosynclastic infindibulum. */
|
|
*diffsec = sec1 - sec2;
|
|
if (usec2 <= usec1) {
|
|
*diffusec = usec1 - usec2;
|
|
} else {
|
|
*diffusec = (usec1 + 1000000) - usec2;
|
|
(*diffsec)--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Decode a base64 string in-place - simple and slow algorithm.
|
|
Return length of result. Taken from rproxy/librsync/base64.c by
|
|
Andrew Tridgell. */
|
|
|
|
size_t base64_decode(char *s)
|
|
{
|
|
static const char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
int bit_offset, byte_offset, idx, i, n;
|
|
unsigned char *d = (unsigned char *)s;
|
|
char *p;
|
|
|
|
n=i=0;
|
|
|
|
while (*s && (p=strchr(b64, *s))) {
|
|
idx = (int)(p - b64);
|
|
byte_offset = (i*6)/8;
|
|
bit_offset = (i*6)%8;
|
|
d[byte_offset] &= ~((1<<(8-bit_offset))-1);
|
|
if (bit_offset < 3) {
|
|
d[byte_offset] |= (idx << (2-bit_offset));
|
|
n = byte_offset+1;
|
|
} else {
|
|
d[byte_offset] |= (idx >> (bit_offset-2));
|
|
d[byte_offset+1] = 0;
|
|
d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
|
|
n = byte_offset+2;
|
|
}
|
|
s++; i++;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
/* Try to figure out if we're remotely connected, e.g. via ssh or
|
|
Terminal Server, and create a capture filter that matches aspects of the
|
|
connection. We match the following environment variables:
|
|
|
|
SSH_CONNECTION (ssh): <remote IP> <remote port> <local IP> <local port>
|
|
SSH_CLIENT (ssh): <remote IP> <remote port> <local port>
|
|
REMOTEHOST (tcsh, others?): <remote name>
|
|
DISPLAY (x11): [remote name]:<display num>
|
|
CLIENTNAME (terminal server): <remote name>
|
|
*/
|
|
|
|
gchar *get_conn_cfilter(void) {
|
|
static GString *filter_str = NULL;
|
|
gchar *env, **tokens;
|
|
|
|
if (filter_str == NULL) {
|
|
filter_str = g_string_new("");
|
|
}
|
|
if ((env = getenv("SSH_CONNECTION")) != NULL) {
|
|
tokens = g_strsplit(env, " ", 4);
|
|
if (tokens[3]) {
|
|
g_string_sprintf(filter_str, "not (tcp port %s and ip host %s "
|
|
"and tcp port %s and ip host %s)", tokens[1], tokens[0],
|
|
tokens[3], tokens[2]);
|
|
return filter_str->str;
|
|
}
|
|
} else if ((env = getenv("SSH_CLIENT")) != NULL) {
|
|
tokens = g_strsplit(env, " ", 3);
|
|
g_string_sprintf(filter_str, "not (tcp port %s and ip host %s "
|
|
"and tcp port %s)", tokens[1], tokens[0], tokens[2]);
|
|
return filter_str->str;
|
|
} else if ((env = getenv("REMOTEHOST")) != NULL) {
|
|
g_string_sprintf(filter_str, "not ip host %s", env);
|
|
return filter_str->str;
|
|
} else if ((env = getenv("DISPLAY")) != NULL) {
|
|
tokens = g_strsplit(env, ":", 2);
|
|
if (tokens[0] && tokens[0][0] != 0) {
|
|
g_string_sprintf(filter_str, "not ip host %s",
|
|
tokens[0]);
|
|
return filter_str->str;
|
|
}
|
|
} else if ((env = getenv("CLIENTNAME")) != NULL) {
|
|
if (g_strcasecmp("console", env) != 0) {
|
|
g_string_sprintf(filter_str, "not ip host %s", env);
|
|
return filter_str->str;
|
|
}
|
|
}
|
|
return "";
|
|
}
|
|
|