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https://github.com/MidnightCommander/mc
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315c499c09
First step: tweak vfs-related code. Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
356 lines
9.6 KiB
C
356 lines
9.6 KiB
C
/*
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Utilities for VFS modules.
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Copyright (C) 1988, 1992, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2011
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The Free Software Foundation, Inc.
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Copyright (C) 1995, 1996 Miguel de Icaza
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This file is part of the Midnight Commander.
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The Midnight Commander is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the License,
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or (at your option) any later version.
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The Midnight Commander 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file
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* \brief Source: Utilities for VFS modules
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* \author Miguel de Icaza
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* \date 1995, 1996
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*/
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#include <config.h>
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#include <ctype.h>
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#include <sys/types.h>
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#include <pwd.h>
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#include <grp.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "lib/global.h"
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#include "lib/unixcompat.h"
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#include "lib/util.h" /* mc_mkstemps() */
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#include "lib/widget.h" /* message() */
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#include "lib/strutil.h" /* INVALID_CONV */
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#include "vfs.h"
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#include "utilvfs.h"
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/*** global variables ****************************************************************************/
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/*** file scope macro definitions ****************************************************************/
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#ifndef TUNMLEN
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#define TUNMLEN 256
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#endif
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#ifndef TGNMLEN
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#define TGNMLEN 256
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#endif
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#define myuid ( my_uid < 0? (my_uid = getuid()): my_uid )
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#define mygid ( my_gid < 0? (my_gid = getgid()): my_gid )
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#define MC_HISTORY_VFS_PASSWORD "mc.vfs.password"
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/*** file scope type declarations ****************************************************************/
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/*** file scope variables ************************************************************************/
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/*** file scope functions ************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/* --------------------------------------------------------------------------------------------- */
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/*** public functions ****************************************************************************/
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/* --------------------------------------------------------------------------------------------- */
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/** Get current username
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*
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* @return g_malloc()ed string with the name of the currently logged in
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* user ("anonymous" if uid is not registered in the system)
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*/
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char *
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vfs_get_local_username (void)
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{
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struct passwd *p_i;
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p_i = getpwuid (geteuid ());
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return (p_i && p_i->pw_name) ? g_strdup (p_i->pw_name) : g_strdup ("anonymous"); /* Unknown UID, strange */
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}
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/* --------------------------------------------------------------------------------------------- */
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/**
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* Look up a user or group name from a uid/gid, maintaining a cache.
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* FIXME, for now it's a one-entry cache.
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* FIXME2, the "-993" is to reduce the chance of a hit on the first lookup.
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* This file should be modified for non-unix systems to do something
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* reasonable.
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*/
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/* --------------------------------------------------------------------------------------------- */
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int
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vfs_finduid (const char *uname)
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{
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static int saveuid = -993;
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static char saveuname[TUNMLEN];
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static int my_uid = -993;
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struct passwd *pw;
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if (uname[0] != saveuname[0] /* Quick test w/o proc call */
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|| 0 != strncmp (uname, saveuname, TUNMLEN))
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{
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g_strlcpy (saveuname, uname, TUNMLEN);
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pw = getpwnam (uname);
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if (pw)
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{
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saveuid = pw->pw_uid;
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}
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else
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{
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saveuid = myuid;
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}
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}
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return saveuid;
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}
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/* --------------------------------------------------------------------------------------------- */
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int
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vfs_findgid (const char *gname)
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{
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static int savegid = -993;
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static char savegname[TGNMLEN];
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static int my_gid = -993;
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struct group *gr;
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if (gname[0] != savegname[0] /* Quick test w/o proc call */
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|| 0 != strncmp (gname, savegname, TUNMLEN))
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{
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g_strlcpy (savegname, gname, TUNMLEN);
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gr = getgrnam (gname);
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if (gr)
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{
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savegid = gr->gr_gid;
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}
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else
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{
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savegid = mygid;
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}
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}
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return savegid;
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}
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/* --------------------------------------------------------------------------------------------- */
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/**
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* Create a temporary file with a name resembling the original.
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* This is needed e.g. for local copies requested by extfs.
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* Some extfs scripts may look at the extension.
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* We also protect stupid scripts agains dangerous names.
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*/
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int
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vfs_mkstemps (vfs_path_t ** pname_vpath, const char *prefix, const char *param_basename)
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{
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const char *p;
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char *suffix, *q;
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int shift;
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int fd;
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/* Strip directories */
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p = strrchr (param_basename, PATH_SEP);
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if (!p)
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p = param_basename;
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else
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p++;
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/* Protection against very long names */
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shift = strlen (p) - (MC_MAXPATHLEN - 16);
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if (shift > 0)
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p += shift;
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suffix = g_malloc (MC_MAXPATHLEN);
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/* Protection against unusual characters */
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q = suffix;
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while (*p && (*p != '#'))
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{
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if (strchr (".-_@", *p) || isalnum ((unsigned char) *p))
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*q++ = *p;
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p++;
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}
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*q = 0;
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fd = mc_mkstemps (pname_vpath, prefix, suffix);
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g_free (suffix);
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return fd;
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}
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/* --------------------------------------------------------------------------------------------- */
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/** Extract the hostname and username from the path
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*
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* Format of the path is [user@]hostname:port/remote-dir, e.g.:
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*
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* ftp://sunsite.unc.edu/pub/linux
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* ftp://miguel@sphinx.nuclecu.unam.mx/c/nc
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* ftp://tsx-11.mit.edu:8192/
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* ftp://joe@foo.edu:11321/private
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* ftp://joe:password@foo.se
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*
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* @param path is an input string to be parsed
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* @param default_port is an input default port
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* @param flags are parsing modifier flags (@see vfs_url_flags_t)
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*
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* @return g_malloc()ed url info.
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* If the user is empty, e.g. ftp://@roxanne/private, and URL_USE_ANONYMOUS
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* is not set, then the current login name is supplied.
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* Return value is a g_malloc()ed structure with the pathname relative to the
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* host.
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*/
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vfs_path_element_t *
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vfs_url_split (const char *path, int default_port, vfs_url_flags_t flags)
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{
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vfs_path_element_t *path_element;
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char *pcopy;
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size_t pcopy_len;
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const char *pend;
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char *dir, *colon, *inner_colon, *at, *rest;
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path_element = g_new0 (vfs_path_element_t, 1);
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path_element->port = default_port;
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pcopy_len = strlen (path);
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pcopy = g_strndup (path, pcopy_len);
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pend = pcopy + pcopy_len;
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dir = pcopy;
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if ((flags & URL_NOSLASH) == 0)
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{
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/* locate path component */
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while (*dir != PATH_SEP && *dir != '\0')
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dir++;
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if (*dir == '\0')
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path_element->path = g_strdup (PATH_SEP_STR);
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else
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{
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path_element->path = g_strndup (dir, pcopy_len - (size_t) (dir - pcopy));
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*dir = '\0';
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}
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}
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/* search for any possible user */
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at = strrchr (pcopy, '@');
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/* We have a username */
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if (at == NULL)
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rest = pcopy;
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else
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{
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*at = '\0';
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inner_colon = strchr (pcopy, ':');
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if (inner_colon != NULL)
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{
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*inner_colon = '\0';
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inner_colon++;
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path_element->password = g_strdup (inner_colon);
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}
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if (*pcopy != '\0')
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path_element->user = g_strdup (pcopy);
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if (pend == at + 1)
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rest = at;
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else
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rest = at + 1;
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}
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if ((flags & URL_USE_ANONYMOUS) == 0)
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path_element->user = vfs_get_local_username ();
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/* Check if the host comes with a port spec, if so, chop it */
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if (*rest != '[')
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colon = strchr (rest, ':');
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else
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{
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colon = strchr (++rest, ']');
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if (colon != NULL)
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{
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colon[0] = '\0';
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colon[1] = '\0';
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colon++;
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}
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else
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{
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vfs_path_element_free (path_element);
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return NULL;
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}
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}
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if (colon != NULL)
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{
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*colon = '\0';
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if (sscanf (colon + 1, "%d", &path_element->port) == 1)
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{
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if (path_element->port <= 0 || path_element->port >= 65536)
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path_element->port = default_port;
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}
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else
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while (*(++colon) != '\0')
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{
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switch (*colon)
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{
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case 'C':
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path_element->port = 1;
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break;
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case 'r':
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path_element->port = 2;
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break;
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}
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}
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}
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path_element->host = g_strdup (rest);
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#ifdef HAVE_CHARSET
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path_element->dir.converter = INVALID_CONV;
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#endif
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return path_element;
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}
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/* --------------------------------------------------------------------------------------------- */
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void
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vfs_die (const char *m)
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{
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message (D_ERROR, _("Internal error:"), "%s", m);
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exit (EXIT_FAILURE);
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}
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/* --------------------------------------------------------------------------------------------- */
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char *
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vfs_get_password (const char *msg)
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{
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return input_dialog (msg, _("Password:"), MC_HISTORY_VFS_PASSWORD, INPUT_PASSWORD);
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}
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/* --------------------------------------------------------------------------------------------- */
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