1 files changed, 376 insertions, 0 deletions
diff --git a/lib/vfs/utilvfs.c b/lib/vfs/utilvfs.c
new file mode 100644
index 0000000..21a2345
--- /dev/null
+++ b/lib/vfs/utilvfs.c
@@ -0,0 +1,376 @@
+/*
+   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);
+}
+
+/* --------------------------------------------------------------------------------------------- */