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wireshark/epan/filesystem.c

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/* filesystem.c
* Filesystem utility routines
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef _WIN32
#include <windows.h>
#include <tchar.h>
#include <shlobj.h>
#include "epan/unicode-utils.h"
#else
#include <pwd.h>
#endif
#include "filesystem.h"
#include "privileges.h"
#include <wiretap/file_util.h>
#define U3_MY_CAPTURES "\\My Captures"
char *persconffile_dir = NULL;
char *persdatafile_dir = NULL;
/*
* Given a pathname, return a pointer to the last pathname separator
* character in the pathname, or NULL if the pathname contains no
* separators.
*/
static char *
find_last_pathname_separator(const char *path)
{
char *separator;
#ifdef _WIN32
char c;
/*
* We have to scan for '\' or '/'.
* Get to the end of the string.
*/
separator = strchr(path, '\0'); /* points to ending '\0' */
while (separator > path) {
c = *--separator;
if (c == '\\' || c == '/')
return separator; /* found it */
}
/*
* OK, we didn't find any, so no directories - but there might
* be a drive letter....
*/
return strchr(path, ':');
#else
separator = strrchr(path, '/');
#endif
return separator;
}
/*
* Given a pathname, return the last component.
*/
const char *
get_basename(const char *path)
{
const char *filename;
g_assert(path != NULL);
filename = find_last_pathname_separator(path);
if (filename == NULL) {
/*
* There're no directories, drive letters, etc. in the
* name; the pathname *is* the file name.
*/
filename = path;
} else {
/*
* Skip past the pathname or drive letter separator.
*/
filename++;
}
return filename;
}
/*
* Given a pathname, return a string containing everything but the
* last component. NOTE: this overwrites the pathname handed into
* it....
*/
char *
get_dirname(char *path)
{
char *separator;
g_assert(path != NULL);
separator = find_last_pathname_separator(path);
if (separator == NULL) {
/*
* There're no directories, drive letters, etc. in the
* name; there is no directory path to return.
*/
return NULL;
}
/*
* Get rid of the last pathname separator and the final file
* name following it.
*/
*separator = '\0';
/*
* "path" now contains the pathname of the directory containing
* the file/directory to which it referred.
*/
return path;
}
/*
* Given a pathname, return:
*
* the errno, if an attempt to "stat()" the file fails;
*
* EISDIR, if the attempt succeeded and the file turned out
* to be a directory;
*
* 0, if the attempt succeeded and the file turned out not
* to be a directory.
*/
/*
* Visual C++ on Win32 systems doesn't define these. (Old UNIX systems don't
* define them either.)
*
* Visual C++ on Win32 systems doesn't define S_IFIFO, it defines _S_IFIFO.
*/
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
#ifndef S_IFIFO
#define S_IFIFO _S_IFIFO
#endif
#ifndef S_ISFIFO
#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)
#endif
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
int
test_for_directory(const char *path)
{
struct stat statb;
if (eth_stat(path, &statb) < 0)
return errno;
if (S_ISDIR(statb.st_mode))
return EISDIR;
else
return 0;
}
int
test_for_fifo(const char *path)
{
struct stat statb;
if (eth_stat(path, &statb) < 0)
return errno;
if (S_ISFIFO(statb.st_mode))
return ESPIPE;
else
return 0;
}
/*
* Directory from which the executable came.
*/
static char *progfile_dir;
/*
* TRUE if we're running from the build directory.
*/
static gboolean running_in_build_directory_flag = FALSE;
/*
* Get the pathname of the directory from which the executable came,
* and save it for future use. Returns NULL on success, and a
* g_mallocated string containing an error on failure.
*/
char *
init_progfile_dir(const char *arg0
#ifdef _WIN32
_U_
#endif
)
{
char *dir_end;
char *path;
#ifdef _WIN32
TCHAR prog_pathname_w[_MAX_PATH+2];
size_t progfile_dir_len;
char *prog_pathname;
DWORD error;
TCHAR *msg_w;
guchar *msg;
size_t msglen;
/*
* Attempt to get the full pathname of the currently running
* program.
*/
if (GetModuleFileName(NULL, prog_pathname_w, sizeof prog_pathname_w) != 0) {
/*
* XXX - Should we use g_utf16_to_utf8(), as in
* getenv_utf8()?
*/
prog_pathname = utf_16to8(prog_pathname_w);
/*
* We got it; strip off the last component, which would be
* the file name of the executable, giving us the pathname
* of the directory where the executable resies
*
* First, find the last "\" in the directory, as that
* marks the end of the directory pathname.
*
* XXX - Can the pathname be something such as
* "C:wireshark.exe"? Or is it always a full pathname
* beginning with "\" after the drive letter?
*/
dir_end = strrchr(prog_pathname, '\\');
if (dir_end != NULL) {
/*
* Found it - now figure out how long the program
* directory pathname will be.
*/
progfile_dir_len = (dir_end - prog_pathname);
/*
* Allocate a buffer for the program directory
* pathname, and construct it.
*/
path = g_malloc(progfile_dir_len + 1);
strncpy(path, prog_pathname, progfile_dir_len);
path[progfile_dir_len] = '\0';
progfile_dir = path;
return NULL; /* we succeeded */
} else {
/*
* OK, no \ - what do we do now?
*/
return g_strdup_printf("No \\ in executable pathname \"%s\"",
prog_pathname);
}
} else {
/*
* Oh, well. Return an indication of the error.
*/
error = GetLastError();
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,
NULL, error, 0, (LPTSTR) &msg_w, 0, NULL) == 0) {
/*
* Gak. We can't format the message.
*/
return g_strdup_printf("GetModuleFileName failed: %u (FormatMessage failed: %u)",
error, GetLastError());
}
msg = utf_16to8(msg_w);
LocalFree(msg_w);
/*
* "FormatMessage()" "helpfully" sticks CR/LF at the
* end of the message. Get rid of it.
*/
msglen = strlen(msg);
if (msglen >= 2) {
msg[msglen - 1] = '\0';
msg[msglen - 2] = '\0';
}
return g_strdup_printf("GetModuleFileName failed: %s (%u)",
msg, error);
}
#else
char *prog_pathname;
char *curdir;
long path_max;
char *pathstr;
char *path_start, *path_end;
size_t path_component_len;
char *retstr;
/*
* Check whether WIRESHARK_RUN_FROM_BUILD_DIRECTORY is set in the
* environment; if so, set running_in_build_directory_flag if we
* weren't started with special privileges. (If we were started
* with special privileges, it's not safe to allow the user to point
* us to some other directory; running_in_build_directory_flag, when
* set, causes us to look for plugins and the like in the build
* directory.)
*/
if (getenv("WIRESHARK_RUN_FROM_BUILD_DIRECTORY") != NULL
&& !started_with_special_privs())
running_in_build_directory_flag = TRUE;
/*
* Try to figure out the directory in which the currently running
* program resides, given the argv[0] it was started with. That
* might be the absolute path of the program, or a path relative
* to the current directory of the process that started it, or
* just a name for the program if it was started from the command
* line and was searched for in $PATH. It's not guaranteed to be
* any of those, however, so there are no guarantees....
*/
if (arg0[0] == '/') {
/*
* It's an absolute path.
*/
prog_pathname = g_strdup(arg0);
} else if (strchr(arg0, '/') != NULL) {
/*
* It's a relative path, with a directory in it.
* Get the current directory, and combine it
* with that directory.
*/
path_max = pathconf(".", _PC_PATH_MAX);
if (path_max == -1) {
/*
* We have no idea how big a buffer to
* allocate for the current directory.
*/
return g_strdup_printf("pathconf failed: %s\n",
strerror(errno));
}
curdir = g_malloc(path_max);
if (getcwd(curdir, path_max) == NULL) {
/*
* It failed - give up, and just stick
* with DATAFILE_DIR.
*/
g_free(curdir);
return g_strdup_printf("getcwd failed: %s\n",
strerror(errno));
}
path = g_malloc(strlen(curdir) + 1 + strlen(arg0) + 1);
strcpy(path, curdir);
strcat(path, "/");
strcat(path, arg0);
g_free(curdir);
prog_pathname = path;
} else {
/*
* It's just a file name.
* Search the path for a file with that name
* that's executable.
*/
prog_pathname = NULL; /* haven't found it yet */
pathstr = getenv("PATH");
path_start = pathstr;
if (path_start != NULL) {
while (*path_start != '\0') {
path_end = strchr(path_start, ':');
if (path_end == NULL)
path_end = path_start + strlen(path_start);
path_component_len = path_end - path_start;
path = g_malloc(path_component_len + 1
+ strlen(arg0) + 1);
memcpy(path, path_start, path_component_len);
path[path_component_len] = '\0';
strcat(path, "/");
strcat(path, arg0);
if (access(path, X_OK) == 0) {
/*
* Found it!
*/
prog_pathname = path;
break;
}
/*
* That's not it. If there are more
* path components to test, try them.
*/
if (*path_end == '\0') {
/*
* There's nothing more to try.
*/
break;
}
if (*path_end == ':')
path_end++;
path_start = path_end;
g_free(path);
}
if (prog_pathname == NULL) {
/*
* Program not found in path.
*/
return g_strdup_printf("\"%s\" not found in \"%s\"",
arg0, pathstr);
}
} else {
/*
* PATH isn't set.
* XXX - should we pick a default?
*/
return g_strdup("PATH isn't set");
}
}
/*
* OK, we have what we think is the pathname
* of the program.
*
* First, find the last "/" in the directory,
* as that marks the end of the directory pathname.
*/
dir_end = strrchr(prog_pathname, '/');
if (dir_end != NULL) {
/*
* Found it. Strip off the last component,
* as that's the path of the program.
*/
*dir_end = '\0';
/*
* Is there a "/.libs" at the end?
*/
dir_end = strrchr(prog_pathname, '/');
if (dir_end != NULL) {
if (strcmp(dir_end, "/.libs") == 0) {
/*
* Yup, it's ".libs".
* Strip that off; it's an
* artifact of libtool.
*/
*dir_end = '\0';
/*
* This presumably means we're run from
* the libtool wrapper, which probably
* means we're being run from the build
* directory. If we weren't started
* with special privileges, set
* running_in_build_directory_flag.
*
* XXX - should we check whether what
* follows ".libs/" begins with "lt-"?
*/
if (!started_with_special_privs())
running_in_build_directory_flag = TRUE;
}
}
/*
* OK, we have the path we want.
*/
progfile_dir = prog_pathname;
return NULL;
} else {
/*
* This "shouldn't happen"; we apparently
* have no "/" in the pathname.
* Just free up prog_pathname.
*/
retstr = g_strdup_printf("No / found in \"%s\"", prog_pathname);
g_free(prog_pathname);
return retstr;
}
#endif
}
/*
* Get the directory in which the program resides.
*/
const char *
get_progfile_dir(void)
{
return progfile_dir;
}
/*
* Get the directory in which the global configuration and data files are
* stored.
*
* On Windows, we use the directory in which the executable for this
* process resides.
*
* On UN*X, we use the DATAFILE_DIR value supplied by the configure
* script, unless we think we're being run from the build directory,
* in which case we use the directory in which the executable for this
* process resides.
*
* XXX - if we ever make libwireshark a real library, used by multiple
* applications (more than just TShark and versions of Wireshark with
* various UIs), should the configuration files belong to the library
* (and be shared by all those applications) or to the applications?
*
* If they belong to the library, that could be done on UNIX by the
* configure script, but it's trickier on Windows, as you can't just
* use the pathname of the executable.
*
* If they belong to the application, that could be done on Windows
* by using the pathname of the executable, but we'd have to have it
* passed in as an argument, in some call, on UNIX.
*
* Note that some of those configuration files might be used by code in
* libwireshark, some of them might be used by dissectors (would they
* belong to libwireshark, the application, or a separate library?),
* and some of them might be used by other code (the Wireshark preferences
* file includes resolver preferences that control the behavior of code
* in libwireshark, dissector preferences, and UI preferences, for
* example).
*/
const char *
get_datafile_dir(void)
{
#ifdef _WIN32
char *u3deviceexecpath;
#endif
static char *datafile_dir = NULL;
if (datafile_dir != NULL)
return datafile_dir;
#ifdef _WIN32
/*
* See if we are running in a U3 environment.
*/
u3deviceexecpath = getenv_utf8("U3_DEVICE_EXEC_PATH");
if (u3deviceexecpath != NULL) {
/*
* We are; use the U3 device executable path.
*/
datafile_dir = u3deviceexecpath;
} else {
/*
* Do we have the pathname of the program? If so, assume we're
* running an installed version of the program. If we fail,
* we don't change "datafile_dir", and thus end up using the
* default.
*
* XXX - does NSIS put the installation directory into
* "\HKEY_LOCAL_MACHINE\SOFTWARE\Wireshark\InstallDir"?
* If so, perhaps we should read that from the registry,
* instead.
*/
if (progfile_dir != NULL) {
/*
* Yes, we do; use that.
*/
datafile_dir = progfile_dir;
} else {
/*
* No, we don't.
* Fall back on the default installation directory.
*/
datafile_dir = "C:\\Program Files\\Wireshark\\";
}
}
#else
if (running_in_build_directory_flag && progfile_dir != NULL) {
/*
* We're (probably) being run from the build directory and
* weren't started with special privileges, and we were
* able to determine the directory in which the program
* was found, so use that.
*/
datafile_dir = progfile_dir;
} else {
/*
* Return the directory specified when the build
* was configured.
*/
datafile_dir = DATAFILE_DIR;
}
#endif
return datafile_dir;
}
/*
* Find the directory where the plugins are stored.
*
* On Windows, we use the "plugin" subdirectory of the datafile directory.
*
* On UN*X, we use the PLUGIN_DIR value supplied by the configure
* script, unless we think we're being run from the build directory,
* in which case we use the "plugin" subdirectory of the datafile directory.
*
* In both cases, we then use the subdirectory of that directory whose
* name is the version number.
*
* XXX - if we think we're being run from the build directory, perhaps we
* should have the plugin code not look in the version subdirectory
* of the plugin directory, but look in all of the subdirectories
* of the plugin directory, so it can just fetch the plugins built
* as part of the build process.
*/
static const char *plugin_dir = NULL;
void
init_plugin_dir(void)
{
#ifdef _WIN32
/*
* On Windows, the data file directory is the installation
* directory; the plugins are stored under it.
*
* Assume we're running the installed version of Wireshark;
* on Windows, the data file directory is the directory
* in which the Wireshark binary resides.
*/
plugin_dir = g_strdup_printf("%s\\plugins\\%s", get_datafile_dir(),
VERSION);
/*
* Make sure that pathname refers to a directory.
*/
if (test_for_directory(plugin_dir) != EISDIR) {
/*
* Either it doesn't refer to a directory or it
* refers to something that doesn't exist.
*
* Assume that means we're running a version of
* Wireshark we've built in a build directory,
* in which case {datafile dir}\plugins is the
* top-level plugins source directory, and use
* that directory and set the "we're running in
* a build directory" flag, so the plugin
* scanner will check all subdirectories of that
* directory for plugins.
*/
g_free( (gpointer) plugin_dir);
plugin_dir = g_strdup_printf("%s\\plugins", get_datafile_dir());
running_in_build_directory_flag = TRUE;
}
#else
if (running_in_build_directory_flag) {
/*
* We're (probably) being run from the build directory and
* weren't started with special privileges, so we'll use
* the "plugins" subdirectory of the datafile directory
* (the datafile directory is the build directory).
*/
plugin_dir = g_strdup_printf("%s/plugins", get_datafile_dir());
} else
plugin_dir = PLUGIN_DIR;
#endif
}
/*
* Get the directory in which the plugins are stored.
*/
const char *
get_plugin_dir(void)
{
if (!plugin_dir) init_plugin_dir();
return plugin_dir;
}
/*
* Get the flag indicating whether we're running from a build
* directory.
*/
gboolean
running_in_build_directory(void)
{
return running_in_build_directory_flag;
}
/*
* Get the directory in which files that, at least on UNIX, are
* system files (such as "/etc/ethers") are stored; on Windows,
* there's no "/etc" directory, so we get them from the global
* configuration and data file directory.
*/
const char *
get_systemfile_dir(void)
{
#ifdef _WIN32
return get_datafile_dir();
#else
return "/etc";
#endif
}
/*
* Name of directory, under the user's home directory, in which
* personal configuration files are stored.
*/
#ifdef _WIN32
#define PF_DIR "Wireshark"
#else
/*
* XXX - should this be ".libepan"? For backwards-compatibility, I'll keep
* it ".wireshark" for now.
*/
#define PF_DIR ".wireshark"
#endif
#ifdef WIN32
/* utf8 version of getenv, needed to get win32 filename paths */
char *getenv_utf8(const char *varname)
{
char *envvar;
wchar_t *envvarw;
wchar_t *varnamew;
envvar = getenv(varname);
/* since GLib 2.6 we need an utf8 version of the filename */
#if (GLIB_MAJOR_VERSION > 2 || (GLIB_MAJOR_VERSION == 2 && GLIB_MINOR_VERSION >= 6))
/* using the wide char version of getenv should work under all circumstances */
/* convert given varname to utf16, needed by _wgetenv */
varnamew = g_utf8_to_utf16(varname, -1, NULL, NULL, NULL);
if (varnamew == NULL) {
return envvar;
}
/* use wide char version of getenv */
envvarw = _wgetenv(varnamew);
g_free(varnamew);
if (envvarw == NULL) {
return envvar;
}
/* convert value to utf8 */
envvar = g_utf16_to_utf8(envvarw, -1, NULL, NULL, NULL);
/* XXX - memleak */
#endif
return envvar;
}
#endif
/*
* Get the directory in which personal configuration files reside;
* in UNIX-compatible systems, it's ".wireshark", under the user's home
* directory, and on Windows systems, it's "Wireshark", under %APPDATA%
* or, if %APPDATA% isn't set, it's "%USERPROFILE%\Application Data"
* (which is what %APPDATA% normally is on Windows 2000).
*/
static const char *
get_persconffile_dir(void)
{
#ifdef _WIN32
char *appdatadir;
char *userprofiledir;
char *u3appdatapath;
#else
const char *homedir;
struct passwd *pwd;
#endif
/* Return the cached value, if available */
if (persconffile_dir != NULL)
return persconffile_dir;
#ifdef _WIN32
/*
* See if we are running in a U3 environment.
*/
u3appdatapath = getenv_utf8("U3_APP_DATA_PATH");
if (u3appdatapath != NULL) {
/*
* We are; use the U3 application data path.
*/
persconffile_dir = u3appdatapath;
} else {
/*
* Use %APPDATA% or %USERPROFILE%, so that configuration
* files are stored in the user profile, rather than in
* the home directory. The Windows convention is to store
* configuration information in the user profile, and doing
* so means you can use Wireshark even if the home directory
* is an inaccessible network drive.
*/
appdatadir = getenv_utf8("APPDATA");
if (appdatadir != NULL) {
/*
* Concatenate %APPDATA% with "\Wireshark".
*/
persconffile_dir = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s",
appdatadir, PF_DIR);
} else {
/*
* OK, %APPDATA% wasn't set, so use
* %USERPROFILE%\Application Data.
*/
userprofiledir = getenv_utf8("USERPROFILE");
if (userprofiledir != NULL) {
persconffile_dir = g_strdup_printf(
"%s" G_DIR_SEPARATOR_S "Application Data" G_DIR_SEPARATOR_S "%s",
userprofiledir, PF_DIR);
} else {
/*
* Give up and use "C:".
*/
persconffile_dir = g_strdup_printf("C:" G_DIR_SEPARATOR_S "%s", PF_DIR);
}
}
}
#else
/*
* If $HOME is set, use that.
*/
homedir = getenv("HOME");
if (homedir == NULL) {
/*
* Get their home directory from the password file.
* If we can't even find a password file entry for them,
* use "/tmp".
*/
pwd = getpwuid(getuid());
if (pwd != NULL) {
/*
* This is cached, so we don't need to worry
* about allocating multiple ones of them.
*/
homedir = g_strdup(pwd->pw_dir);
} else
homedir = "/tmp";
}
persconffile_dir = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", homedir, PF_DIR);
#endif
return persconffile_dir;
}
/*
* Create the directory that holds personal configuration files, if
* necessary. If we attempted to create it, and failed, return -1 and
* set "*pf_dir_path_return" to the pathname of the directory we failed
* to create (it's g_mallocated, so our caller should free it); otherwise,
* return 0.
*/
int
create_persconffile_dir(char **pf_dir_path_return)
{
const char *pf_dir_path;
#ifdef _WIN32
char *pf_dir_path_copy, *pf_dir_parent_path;
size_t pf_dir_parent_path_len;
#endif
struct stat s_buf;
int ret;
pf_dir_path = get_persconffile_dir();
if (eth_stat(pf_dir_path, &s_buf) != 0 && errno == ENOENT) {
#ifdef _WIN32
/*
* Does the parent directory of that directory
* exist? %APPDATA% may not exist even though
* %USERPROFILE% does.
*
* We check for the existence of the directory
* by first checking whether the parent directory
* is just a drive letter and, if it's not, by
* doing a "stat()" on it. If it's a drive letter,
* or if the "stat()" succeeds, we assume it exists.
*/
pf_dir_path_copy = g_strdup(pf_dir_path);
pf_dir_parent_path = get_dirname(pf_dir_path_copy);
pf_dir_parent_path_len = strlen(pf_dir_parent_path);
if (pf_dir_parent_path_len > 0
&& pf_dir_parent_path[pf_dir_parent_path_len - 1] != ':'
&& eth_stat(pf_dir_parent_path, &s_buf) != 0) {
/*
* No, it doesn't exist - make it first.
*/
ret = eth_mkdir(pf_dir_parent_path, 0755);
if (ret == -1) {
*pf_dir_path_return = pf_dir_parent_path;
return -1;
}
}
g_free(pf_dir_path_copy);
ret = eth_mkdir(pf_dir_path, 0755);
#else
ret = eth_mkdir(pf_dir_path, 0755);
#endif
} else {
/*
* Something with that pathname exists; if it's not
* a directory, we'll get an error if we try to put
* something in it, so we don't fail here, we wait
* for that attempt fo fail.
*/
ret = 0;
}
if (ret == -1)
*pf_dir_path_return = g_strdup(pf_dir_path);
return ret;
}
/*
* Get the (default) directory in which personal data is stored.
*
* On Win32, this is the "My Documents" folder in the personal profile.
* On UNIX this is simply the current directory.
* On a U3 device this is "$U3_DEVICE_DOCUMENT_PATH\My Captures" folder.
*/
/* XXX - should this and the get_home_dir() be merged? */
extern char *
get_persdatafile_dir(void)
{
#ifdef _WIN32
char *u3devicedocumentpath;
TCHAR tszPath[MAX_PATH];
char *szPath;
BOOL bRet;
/* Return the cached value, if available */
if (persdatafile_dir != NULL)
return persdatafile_dir;
/*
* See if we are running in a U3 environment.
*/
u3devicedocumentpath = getenv_utf8("U3_DEVICE_DOCUMENT_PATH");
if (u3devicedocumentpath != NULL) {
/* the "My Captures" sub-directory is created (if it doesn't exist)
by u3util.exe when the U3 Wireshark is first run */
szPath = g_malloc(strlen(u3devicedocumentpath) + strlen(U3_MY_CAPTURES) + 1);
strcpy(szPath, u3devicedocumentpath);
strcat(szPath, U3_MY_CAPTURES);
persdatafile_dir = szPath;
return szPath;
} else {
/* Hint: SHGetFolderPath is not available on MSVC 6 - without Platform SDK */
bRet = SHGetSpecialFolderPath(NULL, tszPath, CSIDL_PERSONAL, FALSE);
if(bRet == TRUE) {
szPath = utf_16to8(tszPath);
persdatafile_dir = szPath;
return szPath;
} else {
return "";
}
}
#else
return "";
#endif
}
#ifdef _WIN32
/*
* Returns the user's home directory on Win32.
*/
static const char *
get_home_dir(void)
{
static const char *home = NULL;
char *homedrive, *homepath;
char *homestring;
char *lastsep;
/* Return the cached value, if available */
if (home)
return home;
/*
* XXX - should we use USERPROFILE anywhere in this process?
* Is there a chance that it might be set but one or more of
* HOMEDRIVE or HOMEPATH isn't set?
*/
homedrive = getenv_utf8("HOMEDRIVE");
if (homedrive != NULL) {
homepath = getenv_utf8("HOMEPATH");
if (homepath != NULL) {
/*
* This is cached, so we don't need to worry about
* allocating multiple ones of them.
*/
homestring =
g_malloc(strlen(homedrive) + strlen(homepath) + 1);
strcpy(homestring, homedrive);
strcat(homestring, homepath);
/*
* Trim off any trailing slash or backslash.
*/
lastsep = find_last_pathname_separator(homestring);
if (lastsep != NULL && *(lastsep + 1) == '\0') {
/*
* Last separator is the last character
* in the string. Nuke it.
*/
*lastsep = '\0';
}
home = homestring;
} else
home = homedrive;
} else {
/*
* Give up and use C:.
*/
home = "C:";
}
return home;
}
#endif
/*
* Construct the path name of a personal configuration file, given the
* file name.
*
* On Win32, if "for_writing" is FALSE, we check whether the file exists
* and, if not, construct a path name relative to the ".wireshark"
* subdirectory of the user's home directory, and check whether that
* exists; if it does, we return that, so that configuration files
* from earlier versions can be read.
*/
char *
get_persconffile_path(const char *filename, gboolean for_writing
#ifndef _WIN32
_U_
#endif
)
{
char *path;
#ifdef _WIN32
struct stat s_buf;
char *old_path;
#endif
path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", get_persconffile_dir(),
filename);
#ifdef _WIN32
if (!for_writing) {
if (eth_stat(path, &s_buf) != 0 && errno == ENOENT) {
/*
* OK, it's not in the personal configuration file
* directory; is it in the ".wireshark" subdirectory
* of their home directory?
*/
old_path = g_strdup_printf(
"%s" G_DIR_SEPARATOR_S ".wireshark" G_DIR_SEPARATOR_S "%s",
get_home_dir(), filename);
if (eth_stat(old_path, &s_buf) == 0) {
/*
* OK, it exists; return it instead.
*/
g_free(path);
path = old_path;
}
}
}
#endif
return path;
}
/*
* process command line option belonging to the filesystem settings
* (move this e.g. to main.c and have set_persconffile_dir() instead in this file?)
*/
int
filesystem_opt(int opt _U_, const char *optarg)
{
gchar *p, *colonp;
colonp = strchr(optarg, ':');
if (colonp == NULL) {
return 1;
}
p = colonp;
*p++ = '\0';
/*
* Skip over any white space (there probably won't be any, but
* as we allow it in the preferences file, we might as well
* allow it here).
*/
while (isspace((guchar)*p))
p++;
if (*p == '\0') {
/*
* Put the colon back, so if our caller uses, in an
* error message, the string they passed us, the message
* looks correct.
*/
*colonp = ':';
return 1;
}
/* directory should be existing */
/* XXX - is this a requirement? */
if(test_for_directory(p) != EISDIR) {
/*
* Put the colon back, so if our caller uses, in an
* error message, the string they passed us, the message
* looks correct.
*/
*colonp = ':';
return 1;
}
if (strcmp(optarg,"persconf") == 0) {
persconffile_dir = p;
} else if (strcmp(optarg,"persdata") == 0) {
persdatafile_dir = p;
/* XXX - might need to add the temp file path */
} else {
return 1;
}
*colonp = ':'; /* put the colon back */
return 0;
}
/*
* Construct the path name of a global configuration file, given the
* file name.
*/
char *
get_datafile_path(const char *filename)
{
return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", get_datafile_dir(),
filename);
}
/* Delete a file */
gboolean
deletefile(const char *path)
{
return eth_unlink(path) == 0;
}
/*
* Construct and return the path name of a file in the
* appropriate temporary file directory.
*/
char *get_tempfile_path(const char *filename)
{
return g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s", g_get_tmp_dir(), filename);
}
/*
* Return an error message for UNIX-style errno indications on open or
* create operations.
*/
const char *
file_open_error_message(int err, gboolean for_writing)
{
const char *errmsg;
static char errmsg_errno[1024+1];
switch (err) {
case ENOENT:
if (for_writing)
errmsg = "The path to the file \"%s\" doesn't exist.";
else
errmsg = "The file \"%s\" doesn't exist.";
break;
case EACCES:
if (for_writing)
errmsg = "You don't have permission to create or write to the file \"%s\".";
else
errmsg = "You don't have permission to read the file \"%s\".";
break;
case EISDIR:
errmsg = "\"%s\" is a directory (folder), not a file.";
break;
case ENOSPC:
errmsg = "The file \"%s\" could not be created because there is no space left on the file system.";
break;
#ifdef EDQUOT
case EDQUOT:
errmsg = "The file \"%s\" could not be created because you are too close to, or over, your disk quota.";
break;
#endif
case EINVAL:
errmsg = "The file \"%s\" could not be created because an invalid filename was specified.";
break;
default:
g_snprintf(errmsg_errno, sizeof(errmsg_errno),
"The file \"%%s\" could not be %s: %s.",
for_writing ? "created" : "opened",
strerror(err));
errmsg = errmsg_errno;
break;
}
return errmsg;
}
/*
* Return an error message for UNIX-style errno indications on write
* operations.
*/
const char *
file_write_error_message(int err)
{
const char *errmsg;
static char errmsg_errno[1024+1];
switch (err) {
case ENOSPC:
errmsg = "The file \"%s\" could not be saved because there is no space left on the file system.";
break;
#ifdef EDQUOT
case EDQUOT:
errmsg = "The file \"%s\" could not be saved because you are too close to, or over, your disk quota.";
break;
#endif
default:
g_snprintf(errmsg_errno, sizeof(errmsg_errno),
"An error occurred while writing to the file \"%%s\": %s.",
strerror(err));
errmsg = errmsg_errno;
break;
}
return errmsg;
}
gboolean
file_exists(const char *fname)
{
struct stat file_stat;
#ifdef _WIN32
/*
* This is a bit tricky on win32. The st_ino field is documented as:
* "The inode, and therefore st_ino, has no meaning in the FAT, ..."
* but it *is* set to zero if stat() returns without an error,
* so this is working, but maybe not quite the way expected. ULFL
*/
file_stat.st_ino = 1; /* this will make things work if an error occured */
eth_stat(fname, &file_stat);
if (file_stat.st_ino == 0) {
return TRUE;
} else {
return FALSE;
}
#else
if (eth_stat(fname, &file_stat) != 0 && errno == ENOENT) {
return FALSE;
} else {
return TRUE;
}
#endif
}
/*
* Check that the from file is not the same as to file
* We do it here so we catch all cases ...
* Unfortunately, the file requester gives us an absolute file
* name and the read file name may be relative (if supplied on
* the command line), so we can't just compare paths. From Joerg Mayer.
*/
gboolean
files_identical(const char *fname1, const char *fname2)
{
/* Two different implementations, because:
*
* - _fullpath is not available on UN*X, so we can't get full
* paths and compare them (which wouldn't work with hard links
* in any case);
*
* - st_ino isn't filled in with a meaningful value on Windows.
*/
#ifdef _WIN32
char full1[MAX_PATH], full2[MAX_PATH];
/*
* Get the absolute full paths of the file and compare them.
* That won't work if you have hard links, but those aren't
* much used on Windows, even though NTFS supports them.
*
* XXX - will _fullpath work with UNC?
*/
if( _fullpath( full1, fname1, MAX_PATH ) == NULL ) {
return FALSE;
}
if( _fullpath( full2, fname2, MAX_PATH ) == NULL ) {
return FALSE;
}
if(strcmp(full1, full2) == 0) {
return TRUE;
} else {
return FALSE;
}
#else
struct stat filestat1, filestat2;
/*
* Compare st_dev and st_ino.
*/
if (eth_stat(fname1, &filestat1) == -1)
return FALSE; /* can't get info about the first file */
if (eth_stat(fname2, &filestat2) == -1)
return FALSE; /* can't get info about the second file */
return (filestat1.st_dev == filestat2.st_dev &&
filestat1.st_ino == filestat2.st_ino);
#endif
}
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