mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-23 04:46:55 +03:00
446 lines
9.0 KiB
C
446 lines
9.0 KiB
C
/*
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* Single File fileSystem
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*
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* Copyright 1998 Pavel Machek, distribute under GPL
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*
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* $Id$
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*
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* This defines whole class of filesystems which contain single file
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* inside. It is somehow similar to extfs, except that extfs makes
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* whole virtual trees and we do only single virtual files.
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*
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* If you want to gunzip something, you should open it with #ugz
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* suffix, DON'T try to gunzip it yourself.
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*
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* Namespace: exports vfs_sfs_ops, shell (FIXME) */
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#include <config.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include "utilvfs.h"
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#include "vfs.h"
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#include "local.h"
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/* This is needed, or libvfs.so will lack symbol shell. Should look up who requires it */
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char *shell = "/bin/sh";
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struct cachedfile {
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char *name, *cache;
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uid_t uid;
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struct cachedfile *next;
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};
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static struct cachedfile *head;
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#define MAXFS 32
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static int sfs_no = 0;
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static char *sfs_prefix[ MAXFS ];
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static char *sfs_command[ MAXFS ];
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static int sfs_flags[ MAXFS ];
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#define F_1 1
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#define F_2 2
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#define F_NOLOCALCOPY 4
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#define F_FULLMATCH 8
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static int uptodate (char *name, char *cache)
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{
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return 1;
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}
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static int vfmake (vfs *me, char *name, char *cache)
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{
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char *inpath, *op;
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int w;
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char pad [10240];
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char *s, *t = pad;
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int was_percent = 0;
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vfs_split (name, &inpath, &op);
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if ((w = (*me->which) (me, op)) == -1)
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vfs_die ("This cannot happen... Hopefully.\n");
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if ((sfs_flags[w] & F_1) || (!strcmp (name, "/"))) ; else return -1;
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/* if ((sfs_flags[w] & F_2) || (!inpath) || (!*inpath)); else return -1; */
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if (!(sfs_flags[w] & F_NOLOCALCOPY)) {
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s = mc_getlocalcopy (name);
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if (!s)
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return -1;
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name = name_quote (s, 0);
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g_free (s);
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} else
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name = name_quote (name, 0);
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#define COPY_CHAR if (t-pad>sizeof(pad)) { g_free (name); return -1; } else *t++ = *s;
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#define COPY_STRING(a) if ((t-pad)+strlen(a)>sizeof(pad)) { g_free (name); return -1; } else { strcpy (t, a); t+= strlen(a); }
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for (s = sfs_command[w]; *s; s++) {
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if (was_percent) {
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char *ptr = NULL;
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was_percent = 0;
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switch (*s) {
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case '1': ptr = name; break;
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case '2': ptr = op + strlen (sfs_prefix[w]); break;
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case '3': ptr = cache; break;
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case '%': COPY_CHAR; continue;
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}
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COPY_STRING (ptr);
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} else {
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if (*s == '%')
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was_percent = 1;
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else
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COPY_CHAR;
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}
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}
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g_free (name);
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if (my_system (EXECUTE_AS_SHELL | EXECUTE_SETUID | EXECUTE_WAIT, "/bin/sh", pad)) {
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return -1;
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}
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return 0; /* OK */
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}
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static char *
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redirect (vfs *me, char *name)
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{
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struct cachedfile *cur = head;
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uid_t uid = vfs_uid;
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char *cache;
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int handle;
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while (cur){
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if ((!strcmp (name, cur->name)) &&
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(uid == cur->uid) &&
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(uptodate (cur->name, cur->cache)))
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/* FIXME: when not uptodate, we might want to kill cache
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* file immediately, not to wait until timeout. */ {
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vfs_stamp (&vfs_sfs_ops, cur);
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return cur->cache;
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}
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cur = cur->next;
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}
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cache = tempnam (NULL, "sfs");
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handle = open (cache, O_RDWR | O_CREAT | O_EXCL, 0600);
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if (handle == -1) {
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g_free (cache);
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return "/SOMEONE_PLAYING_DIRTY_TMP_TRICKS_ON_US";
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}
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close (handle);
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if (!vfmake (me, name, cache)){
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cur = g_new (struct cachedfile, 1);
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cur->name = g_strdup (name);
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cur->cache = cache;
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cur->uid = uid;
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cur->next = head;
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head = cur;
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vfs_add_noncurrent_stamps (&vfs_sfs_ops, (vfsid) head, NULL);
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vfs_rm_parents (NULL);
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return cache;
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}
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unlink (cache);
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g_free (cache);
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return "/I_MUST_NOT_EXIST";
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}
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static void *
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sfs_open (vfs *me, char *path, int flags, int mode)
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{
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int *sfs_info;
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int fd;
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path = redirect (me, path);
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fd = open (path, flags, mode);
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if (fd == -1)
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return 0;
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sfs_info = g_new (int, 1);
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*sfs_info = fd;
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return sfs_info;
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}
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static int sfs_stat (vfs *me, char *path, struct stat *buf)
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{
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path = redirect (me, path);
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return stat (path, buf);
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}
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static int sfs_lstat (vfs *me, char *path, struct stat *buf)
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{
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path = redirect (me, path);
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#ifndef HAVE_STATLSTAT
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return lstat (path, buf);
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#else
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return statlstat (path, buf);
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#endif
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}
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static int sfs_chmod (vfs *me, char *path, int mode)
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{
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path = redirect (me, path);
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return chmod (path, mode);
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}
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static int sfs_chown (vfs *me, char *path, int owner, int group)
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{
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path = redirect (me, path);
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return chown (path, owner, group);
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}
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static int sfs_utime (vfs *me, char *path, struct utimbuf *times)
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{
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path = redirect (me, path);
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return utime (path, times);
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}
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static int sfs_readlink (vfs *me, char *path, char *buf, int size)
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{
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path = redirect (me, path);
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return readlink (path, buf, size);
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}
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static vfsid sfs_getid (vfs *me, char *path, struct vfs_stamping **parent)
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{ /* FIXME: what should I do? */
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vfs *v;
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vfsid id;
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struct vfs_stamping *par;
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struct cachedfile *cur = head;
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while (cur) {
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if ((!strcmp( path, cur->name )) &&
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(vfs_uid == cur->uid))
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break;
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cur = cur->next;
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}
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if (!cur)
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vfs_die( "sfs_getid of noncached thingie?" );
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*parent = NULL;
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{
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char *path2 = g_strdup (path);
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v = vfs_split (path2, NULL, NULL); /* Strip suffix which led to this being sfs */
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v = vfs_split (path2, NULL, NULL); /* ... and learn whoever was the parent system */
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id = (*v->getid) (v, path2, &par);
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g_free (path2);
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}
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if (id != (vfsid)-1) {
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*parent = g_new (struct vfs_stamping, 1);
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(*parent)->v = v;
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(*parent)->id = id;
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(*parent)->parent = par;
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(*parent)->next = NULL;
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}
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return (vfsid) cur;
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}
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static void sfs_free (vfsid id)
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{
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struct cachedfile *which = (struct cachedfile *) id;
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struct cachedfile *cur, *prev;
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for (cur = head, prev = 0; cur && cur != which; prev = cur, cur = cur->next)
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;
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if (!cur)
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vfs_die( "Free of thing which is unknown to me\n" );
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unlink (cur->cache);
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if (prev)
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prev->next = cur->next;
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else
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head = cur->next;
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}
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static void sfs_fill_names (vfs *me, void (*func)(char *))
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{
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struct cachedfile *cur = head;
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while (cur){
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(*func)(cur->name);
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cur = cur->next;
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}
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}
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static int sfs_nothingisopen (vfsid id)
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{
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/* FIXME: Investigate whether have to guard this like in
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the other VFSs (see fd_usage in extfs) -- Norbert */
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return 1;
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}
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static char *sfs_getlocalcopy (vfs *me, char *path)
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{
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path = redirect (me, path);
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return g_strdup (path);
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}
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static int sfs_ungetlocalcopy (vfs *me, char *path, char *local, int has_changed)
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{
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g_free(local);
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return 0;
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}
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static int sfs_init (vfs *me)
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{
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FILE *cfg = fopen (LIBDIR "extfs/sfs.ini", "r");
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if (!cfg){
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fprintf (stderr, _("Warning: %sextfs/sfs.ini not found\n"), LIBDIR);
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return 0;
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}
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sfs_no = 0;
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while (sfs_no < MAXFS){
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char key[256];
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char *c, *semi = NULL, flags = 0;
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int i;
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if (!fgets (key, 250, cfg))
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break;
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if (*key == '#')
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continue;
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for (i = 0; i < strlen (key); i++)
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if ((key[i]==':') || (key[i]=='/')){
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semi = key+i;
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if (key [i] == '/'){
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key [i] = 0;
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flags |= F_FULLMATCH;
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}
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break;
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}
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if (!semi){
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fprintf (stderr, _("Warning: Invalid line %s in sfs.ini.\n"), key);
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continue;
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}
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c = semi + 1;
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while ((*c != ' ') && (*c != 9)) {
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switch (*c) {
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case '1': flags |= F_1; break;
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case '2': flags |= F_2; break;
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case 'R': flags |= F_NOLOCALCOPY; break;
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default:
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fprintf (stderr, _("Warning: Invalid flag %c in sfs.ini line %s.\n"), *c, key);
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}
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c++;
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}
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c++;
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*(semi+1) = 0;
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if ((semi = strchr (c, '\n')))
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*semi = 0;
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sfs_prefix [sfs_no] = g_strdup (key);
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sfs_command [sfs_no] = g_strdup (c);
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sfs_flags [sfs_no] = flags;
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sfs_no++;
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}
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fclose (cfg);
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return 1;
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}
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static void
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sfs_done (vfs *me)
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{
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int i;
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for (i = 0; i < sfs_no; i++){
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g_free (sfs_prefix [i]);
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g_free (sfs_command [i]);
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sfs_prefix [i] = sfs_command [i] = NULL;
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}
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sfs_no = 0;
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}
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static int
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sfs_which (vfs *me, char *path)
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{
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int i;
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for (i = 0; i < sfs_no; i++)
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if (sfs_flags [i] & F_FULLMATCH) {
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if (!strcmp (path, sfs_prefix [i]))
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return i;
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} else
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if (!strncmp (path, sfs_prefix [i], strlen (sfs_prefix [i])))
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return i;
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return -1;
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}
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vfs vfs_sfs_ops = {
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NULL, /* This is place of next pointer */
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N_ ("Signle file filesystems"),
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F_EXEC, /* flags */
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NULL, /* prefix */
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NULL, /* data */
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0, /* errno */
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sfs_init,
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sfs_done,
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sfs_fill_names,
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sfs_which,
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sfs_open,
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local_close,
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local_read,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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sfs_stat,
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sfs_lstat,
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local_fstat,
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sfs_chmod,
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sfs_chown,
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sfs_utime,
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sfs_readlink,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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local_errno,
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local_lseek,
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NULL,
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sfs_getid,
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sfs_nothingisopen,
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sfs_free,
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sfs_getlocalcopy,
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sfs_ungetlocalcopy,
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NULL,
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NULL,
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NULL,
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NULL
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#ifdef HAVE_MMAP
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,local_mmap,
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local_munmap
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#endif
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};
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