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mc/lib/vfs/utilvfs.c

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/*
Utilities for VFS modules.
Copyright (C) 1988-2022
Free Software Foundation, Inc.
Copyright (C) 1995, 1996 Miguel de Icaza
This file is part of the Midnight Commander.
The Midnight Commander 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 3 of the License,
or (at your option) any later version.
The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
*/
/**
* \file
* \brief Source: Utilities for VFS modules
* \author Miguel de Icaza
* \date 1995, 1996
*/
#include <config.h>
#include <ctype.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <stdlib.h>
#include <string.h>
#include "lib/global.h"
#include "lib/unixcompat.h"
#include "lib/util.h" /* mc_mkstemps() */
#include "lib/widget.h" /* message() */
#include "lib/strutil.h" /* INVALID_CONV */
#include "vfs.h"
#include "utilvfs.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
#ifndef TUNMLEN
#define TUNMLEN 256
#endif
#ifndef TGNMLEN
#define TGNMLEN 256
#endif
#define MC_HISTORY_VFS_PASSWORD "mc.vfs.password"
/*
* FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
*/
#define GUID_DEFAULT_CONST -993
/*** file scope type declarations ****************************************************************/
/*** file scope variables ************************************************************************/
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/** Get current username
*
* @return g_malloc()ed string with the name of the currently logged in
* user ("anonymous" if uid is not registered in the system)
*/
char *
vfs_get_local_username (void)
{
struct passwd *p_i;
p_i = getpwuid (geteuid ());
return (p_i && p_i->pw_name) ? g_strdup (p_i->pw_name) : g_strdup ("anonymous"); /* Unknown UID, strange */
}
/* --------------------------------------------------------------------------------------------- */
/**
* Look up a user or group name from a uid/gid, maintaining a cache.
* FIXME, for now it's a one-entry cache.
* This file should be modified for non-unix systems to do something
* reasonable.
*/
/* --------------------------------------------------------------------------------------------- */
int
vfs_finduid (const char *uname)
{
static int saveuid = GUID_DEFAULT_CONST;
static char saveuname[TUNMLEN] = "\0";
size_t uname_len;
uname_len = strlen (uname);
if (uname[0] != saveuname[0] /* Quick test w/o proc call */
|| strncmp (uname, saveuname, MIN (uname_len, TUNMLEN - 1)) != 0)
{
struct passwd *pw;
g_strlcpy (saveuname, uname, TUNMLEN);
pw = getpwnam (uname);
if (pw)
{
saveuid = pw->pw_uid;
}
else
{
static int my_uid = GUID_DEFAULT_CONST;
if (my_uid < 0)
my_uid = getuid ();
saveuid = my_uid;
}
}
return saveuid;
}
/* --------------------------------------------------------------------------------------------- */
int
vfs_findgid (const char *gname)
{
static int savegid = GUID_DEFAULT_CONST;
static char savegname[TGNMLEN] = "\0";
size_t gname_len;
gname_len = strlen (gname);
if (gname[0] != savegname[0] /* Quick test w/o proc call */
|| strncmp (gname, savegname, MIN (gname_len, TGNMLEN - 1)) != 0)
{
struct group *gr;
g_strlcpy (savegname, gname, TGNMLEN);
gr = getgrnam (gname);
if (gr)
{
savegid = gr->gr_gid;
}
else
{
static int my_gid = GUID_DEFAULT_CONST;
if (my_gid < 0)
my_gid = getgid ();
savegid = my_gid;
}
}
return savegid;
}
/* --------------------------------------------------------------------------------------------- */
/**
* Create a temporary file with a name resembling the original.
* This is needed e.g. for local copies requested by extfs.
* Some extfs scripts may look at the extension.
* We also protect stupid scripts agains dangerous names.
*/
int
vfs_mkstemps (vfs_path_t ** pname_vpath, const char *prefix, const char *param_basename)
{
const char *p;
GString *suffix;
int shift;
int fd;
/* Strip directories */
p = strrchr (param_basename, PATH_SEP);
if (p == NULL)
p = param_basename;
else
p++;
/* Protection against very long names */
shift = strlen (p) - (MC_MAXPATHLEN - 16);
if (shift > 0)
p += shift;
suffix = g_string_sized_new (32);
/* Protection against unusual characters */
for (; *p != '\0' && *p != '#'; p++)
if (strchr (".-_@", *p) != NULL || g_ascii_isalnum (*p))
g_string_append_c (suffix, *p);
fd = mc_mkstemps (pname_vpath, prefix, suffix->str);
g_string_free (suffix, TRUE);
return fd;
}
/* --------------------------------------------------------------------------------------------- */
/** Extract the hostname and username from the path
*
* Format of the path is [user@]hostname:port/remote-dir, e.g.:
*
* ftp://sunsite.unc.edu/pub/linux
* ftp://miguel@sphinx.nuclecu.unam.mx/c/nc
* ftp://tsx-11.mit.edu:8192/
* ftp://joe@foo.edu:11321/private
* ftp://joe:password@foo.se
*
* @param path is an input string to be parsed
* @param default_port is an input default port
* @param flags are parsing modifier flags (@see vfs_url_flags_t)
*
* @return g_malloc()ed url info.
* If the user is empty, e.g. ftp://@roxanne/private, and URL_USE_ANONYMOUS
* is not set, then the current login name is supplied.
* Return value is a g_malloc()ed structure with the pathname relative to the
* host.
*/
vfs_path_element_t *
vfs_url_split (const char *path, int default_port, vfs_url_flags_t flags)
{
vfs_path_element_t *path_element;
char *pcopy;
size_t pcopy_len;
const char *pend;
char *colon, *at, *rest;
path_element = g_new0 (vfs_path_element_t, 1);
path_element->port = default_port;
pcopy_len = strlen (path);
pcopy = g_strndup (path, pcopy_len);
pend = pcopy + pcopy_len;
if ((flags & URL_NOSLASH) == 0)
{
char *dir = pcopy;
/* locate path component */
while (!IS_PATH_SEP (*dir) && *dir != '\0')
dir++;
if (*dir == '\0')
path_element->path = g_strdup (PATH_SEP_STR);
else
{
path_element->path = g_strndup (dir, pcopy_len - (size_t) (dir - pcopy));
*dir = '\0';
}
}
/* search for any possible user */
at = strrchr (pcopy, '@');
/* We have a username */
if (at == NULL)
rest = pcopy;
else
{
char *inner_colon;
*at = '\0';
inner_colon = strchr (pcopy, ':');
if (inner_colon != NULL)
{
*inner_colon = '\0';
inner_colon++;
path_element->password = g_strdup (inner_colon);
}
if (*pcopy != '\0')
path_element->user = g_strdup (pcopy);
if (pend == at + 1)
rest = at;
else
rest = at + 1;
}
if ((flags & URL_USE_ANONYMOUS) == 0)
{
g_free (path_element->user);
path_element->user = vfs_get_local_username ();
}
/* Check if the host comes with a port spec, if so, chop it */
if (*rest != '[')
colon = strchr (rest, ':');
else
{
colon = strchr (++rest, ']');
if (colon != NULL)
{
colon[0] = '\0';
colon[1] = '\0';
colon++;
}
else
{
vfs_path_element_free (path_element);
g_free (pcopy);
return NULL;
}
}
if (colon != NULL)
{
*colon = '\0';
/* cppcheck-suppress invalidscanf */
if (sscanf (colon + 1, "%d", &path_element->port) == 1)
{
if (path_element->port <= 0 || path_element->port >= 65536)
path_element->port = default_port;
}
else
while (*(++colon) != '\0')
{
switch (*colon)
{
case 'C':
path_element->port = 1;
break;
case 'r':
path_element->port = 2;
break;
default:
break;
}
}
}
path_element->host = g_strdup (rest);
g_free (pcopy);
#ifdef HAVE_CHARSET
path_element->dir.converter = INVALID_CONV;
#endif
return path_element;
}
/* --------------------------------------------------------------------------------------------- */
void __attribute__ ((noreturn)) vfs_die (const char *m)
{
message (D_ERROR, _("Internal error:"), "%s", m);
exit (EXIT_FAILURE);
}
/* --------------------------------------------------------------------------------------------- */
char *
vfs_get_password (const char *msg)
{
return input_dialog (msg, _("Password:"), MC_HISTORY_VFS_PASSWORD, INPUT_PASSWORD,
INPUT_COMPLETE_NONE);
}
/* --------------------------------------------------------------------------------------------- */
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