/* util.c * Utility routines * * $Id$ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #ifdef NEED_MKSTEMP #include "mkstemp.h" #endif #ifdef HAVE_IO_H #include #ifndef __MINGW32__ typedef int mode_t; /* for win32 */ #endif /* __MINGW32__ */ #endif /* HAVE_IO_H */ #include #include /* * This has to come after the include of , as the include of * might cause to be included, and if we've * already included as a result of including , * we get a bunch of redefinitions. */ #ifdef HAVE_WINDOWS_H #include #endif #include "util.h" /* * Collect command-line arguments as a string consisting of the arguments, * separated by spaces. */ char * get_args_as_string(int argc, char **argv, int optind) { int len; int i; char *argstring; /* * Find out how long the string will be. */ len = 0; for (i = optind; i < argc; i++) { len += strlen(argv[i]); len++; /* space, or '\0' if this is the last argument */ } /* * Allocate the buffer for the string. */ argstring = g_malloc(len); /* * Now construct the string. */ strcpy(argstring, ""); i = optind; for (;;) { strcat(argstring, argv[i]); i++; if (i == argc) break; strcat(argstring, " "); } return argstring; } static char * setup_tmpdir(char *dir) { int len = strlen(dir); char *newdir; /* Append path separator if necessary */ if (dir[len - 1] == G_DIR_SEPARATOR) { newdir = dir; } else { newdir = g_malloc(len + 2); strcpy(newdir, dir); strcat(newdir, G_DIR_SEPARATOR_S); } return newdir; } static int try_tempfile(char *namebuf, int namebuflen, const char *dir, const char *pfx) { static const char suffix[] = "XXXXXXXXXX"; int namelen = strlen(dir) + strlen(pfx) + sizeof suffix; mode_t old_umask; int tmp_fd; if (namebuflen < namelen) { /* Stick in a truncated name, so that if this error is reported with the file name, you at least get something. */ snprintf(namebuf, namebuflen, "%s%s%s", dir, pfx, suffix); errno = ENAMETOOLONG; return -1; } strcpy(namebuf, dir); strcat(namebuf, pfx); strcat(namebuf, suffix); /* The Single UNIX Specification doesn't say that "mkstemp()" creates the temporary file with mode rw-------, so we won't assume that all UNIXes will do so; instead, we set the umask to 0077 to take away all group and other permissions, attempt to create the file, and then put the umask back. */ old_umask = umask(0077); tmp_fd = mkstemp(namebuf); umask(old_umask); return tmp_fd; } static char *tmpdir = NULL; #ifdef _WIN32 static char *temp = NULL; #endif static char *E_tmpdir; #ifndef P_tmpdir #define P_tmpdir "/var/tmp" #endif int create_tempfile(char *namebuf, int namebuflen, const char *pfx) { char *dir; int fd; static gboolean initialized; if (!initialized) { if ((dir = getenv("TMPDIR")) != NULL) tmpdir = setup_tmpdir(dir); #ifdef _WIN32 if ((dir = getenv("TEMP")) != NULL) temp = setup_tmpdir(dir); #endif E_tmpdir = setup_tmpdir(P_tmpdir); initialized = TRUE; } if (tmpdir != NULL) { fd = try_tempfile(namebuf, namebuflen, tmpdir, pfx); if (fd != -1) return fd; } #ifdef _WIN32 if (temp != NULL) { fd = try_tempfile(namebuf, namebuflen, temp, pfx); if (fd != -1) return fd; } #endif fd = try_tempfile(namebuf, namebuflen, E_tmpdir, pfx); if (fd != -1) return fd; return try_tempfile(namebuf, namebuflen, G_DIR_SEPARATOR_S "tmp", pfx); } /* 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)--; } } } /* 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): SSH_CLIENT (ssh): REMOTEHOST (tcsh, others?): DISPLAY (x11): [remote name]: CLIENTNAME (terminal server): */ 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 %s host %s " "and tcp port %s and %s host %s)", tokens[1], host_ip_af(tokens[0]), tokens[0], tokens[3], host_ip_af(tokens[2]), 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 %s host %s " "and tcp port %s)", tokens[1], host_ip_af(tokens[0]), tokens[0], tokens[2]); return filter_str->str; } else if ((env = getenv("REMOTEHOST")) != NULL) { if (strcasecmp(env, "localhost") == 0 || strcmp(env, "127.0.0.1") == 0) { return ""; } g_string_sprintf(filter_str, "not %s host %s", host_ip_af(env), env); return filter_str->str; } else if ((env = getenv("DISPLAY")) != NULL) { tokens = g_strsplit(env, ":", 2); if (tokens[0] && tokens[0][0] != 0) { if (strcasecmp(tokens[0], "localhost") == 0 || strcmp(tokens[0], "127.0.0.1") == 0) { return ""; } g_string_sprintf(filter_str, "not %s host %s", host_ip_af(tokens[0]), tokens[0]); return filter_str->str; } } else if ((env = getenv("CLIENTNAME")) != NULL) { if (g_strcasecmp("console", env) != 0) { g_string_sprintf(filter_str, "not %s host %s", host_ip_af(env), env); return filter_str->str; } } return ""; }