mirror of
https://github.com/MidnightCommander/mc
synced 2024-12-23 12:56:51 +03:00
432 lines
9.0 KiB
C
432 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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* 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 <malloc.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 "../src/mad.h"
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#include "../src/fs.h"
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#include <fcntl.h>
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#include "../src/util.h"
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#include "../src/main.h"
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#include "vfs.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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name = mc_getlocalcopy( name );
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else
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name = strdup( name );
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s = sfs_command[w];
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#define COPY_CHAR if (t-pad>10200) return -1; else *t++ = *s;
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#define COPY_STRING(a) if ((t-pad)+strlen(a)>10200) return -1; else { strcpy( t, a ); t+= strlen(a); }
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while (*s) {
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if (was_percent) {
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switch (*s) {
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case '1': COPY_STRING( name ); break;
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case '2': COPY_STRING( op + strlen( sfs_prefix[w] ) ); break;
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case '3': COPY_STRING( cache ); break;
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case '%': COPY_CHAR; break;
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}
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was_percent = 0;
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} else {
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if (*s == '%') was_percent = 1;
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else COPY_CHAR;
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}
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s++;
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}
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free( name );
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if (my_system (EXECUTE_AS_SHELL | EXECUTE_SETUID, "/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 *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, *xname;
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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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return "/SOMEONE_PLAYING_DIRTY_TMP_TRICKS_ON_US";
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close(handle);
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xname = strdup( name );
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if (!vfmake( me, name, cache )) {
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cur = xmalloc( sizeof(struct cachedfile), "SFS cache" );
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cur->name = xname;
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cur->cache = strdup(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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} else {
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free(xname);
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}
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return "/I_MUST_NOT_EXIST";
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}
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#define REDIR path = redirect( me, path );
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static void *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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REDIR;
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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 = (int *) xmalloc (sizeof (int), "SF fs");
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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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REDIR;
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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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REDIR;
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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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REDIR;
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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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REDIR;
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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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REDIR;
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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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REDIR;
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return readlink (path, buf, size);
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}
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#define CUR (*cur)
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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 = strdup( path );
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v = vfs_split (path2, NULL, NULL);
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id = (*v->getid) (v, path2, &par);
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free( path2 );
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}
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if (id != (vfsid)-1) {
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*parent = xmalloc (sizeof (struct vfs_stamping), "vfs stamping");
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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 = &head;
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unlink( CUR->cache );
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while (CUR) {
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if (CUR == which)
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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( "Free of thing which is unknown to me\n" );
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*cur = CUR->next;
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}
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#undef CUR
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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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return 0;
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}
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static char *sfs_getlocalcopy (vfs *me, char *path)
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{
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REDIR;
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return strdup (path);
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}
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static void sfs_ungetlocalcopy (vfs *me, char *path, char *local, int has_changed)
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{
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}
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extern int local_close (void *data);
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extern int local_read (void *data, char *buffer, int count);
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extern int local_fstat (void *data, struct stat *buf);
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extern int local_errno (vfs *me);
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extern int local_lseek (void *data, off_t offset, int whence);
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#ifdef HAVE_MMAP
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extern caddr_t local_mmap (vfs *me, caddr_t addr, size_t len, int prot, int flags, void *data, off_t offset);
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extern int local_munmap (vfs *me, caddr_t addr, size_t len, void *data);
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#endif
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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: " LIBDIR "extfs/sfs.ini not found\n" );
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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; if (key[i]=='/') { key[i]=0; flags |= F_FULLMATCH; } break; }
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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] = strdup (key);
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sfs_command [sfs_no] = 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 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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free(sfs_prefix [i]);
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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 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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"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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