source3/modules/vfs_cap.c

   1 /*
   2  * CAP VFS module for Samba 3.x Version 0.3
   3  *
   4  * Copyright (C) Tim Potter, 1999-2000
   5  * Copyright (C) Alexander Bokovoy, 2002-2003
   6  * Copyright (C) Stefan (metze) Metzmacher, 2003
   7  * Copyright (C) TAKAHASHI Motonobu (monyo), 2003
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24
  25 #include "includes.h"
  26
  27 /* cap functions */
  28 static char *capencode(char *to, const char *from);
  29 static char *capdecode(char *to, const char *from);
  30
  31 static SMB_BIG_UINT cap_disk_free(vfs_handle_struct *handle, connection_struct *conn, const char *path,
  32         BOOL small_query, SMB_BIG_UINT *bsize,
  33         SMB_BIG_UINT *dfree, SMB_BIG_UINT *dsize)
  34 {
  35         pstring cappath;
  36         capencode(cappath, path);
  37         return SMB_VFS_NEXT_DISK_FREE(handle, conn, cappath, small_query, bsize,
  38                                          dfree, dsize);
  39 }
  40
  41 static int cap_set_quota(vfs_handle_struct *handle, connection_struct *conn, enum SMB_QUOTA_TYPE qtype, unid_t id, SMB_DISK_QUOTA *dq)
  42 {
  43         return SMB_VFS_NEXT_SET_QUOTA(handle, conn, qtype, id, dq);
  44 }
  45
  46 static DIR *cap_opendir(vfs_handle_struct *handle, connection_struct *conn, const char *fname)
  47 {
  48         pstring capname;
  49         capencode(capname, fname);
  50         return SMB_VFS_NEXT_OPENDIR(handle, conn, capname);
  51 }
  52
  53 static struct dirent *cap_readdir(vfs_handle_struct *handle, connection_struct *conn, DIR *dirp)
  54 {
  55         struct dirent *result;
  56         DEBUG(3,("cap: cap_readdir\n"));
  57         result = SMB_VFS_NEXT_READDIR(handle, conn, dirp);
  58         if (result) {
  59           DEBUG(3,("cap: cap_readdir: %s\n", result->d_name));
  60           capdecode(result->d_name, result->d_name);
  61         }
  62         return result;
  63 }
  64
  65 static int cap_mkdir(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode)
  66 {
  67   pstring cappath;
  68   capencode(cappath, path);
  69   return SMB_VFS_NEXT_MKDIR(handle, conn, cappath, mode);
  70 }
  71
  72 static int cap_rmdir(vfs_handle_struct *handle, connection_struct *conn, const char *path)
  73 {
  74         pstring cappath;
  75         capencode(cappath, path);
  76         return SMB_VFS_NEXT_RMDIR(handle, conn, cappath);
  77 }
  78
  79 static int cap_open(vfs_handle_struct *handle, connection_struct *conn, const char *fname, int flags, mode_t mode)
  80 {
  81         pstring capname;
  82         DEBUG(3,("cap: cap_open for %s\n", fname));
  83         capencode(capname, fname);
  84         return SMB_VFS_NEXT_OPEN(handle, conn, capname, flags, mode);
  85 }
  86
  87 static int cap_rename(vfs_handle_struct *handle, connection_struct *conn, const char *old, const char *new)
  88 {
  89         pstring capold, capnew;
  90         capencode(capold, old);
  91         capencode(capnew, new);
  92
  93         return SMB_VFS_NEXT_RENAME(handle, conn, capold, capnew);
  94 }
  95
  96 static int cap_stat(vfs_handle_struct *handle, connection_struct *conn, const char *fname, SMB_STRUCT_STAT *sbuf)
  97 {
  98         pstring capname;
  99         capencode(capname, fname);
 100         return SMB_VFS_NEXT_STAT(handle, conn, capname, sbuf);
 101 }
 102
 103 static int cap_lstat(vfs_handle_struct *handle, connection_struct *conn, const char *path, SMB_STRUCT_STAT *sbuf)
 104 {
 105         pstring cappath;
 106         capencode(cappath, path);
 107         return SMB_VFS_NEXT_LSTAT(handle, conn, cappath, sbuf);
 108 }
 109
 110 static int cap_unlink(vfs_handle_struct *handle, connection_struct *conn, const char *path)
 111 {
 112         pstring cappath;
 113         capencode(cappath, path);
 114         return SMB_VFS_NEXT_UNLINK(handle, conn, cappath);
 115 }
 116
 117 static int cap_chmod(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode)
 118 {
 119         pstring cappath;
 120         capencode(cappath, path);
 121         return SMB_VFS_NEXT_CHMOD(handle, conn, cappath, mode);
 122 }
 123
 124 static int cap_chown(vfs_handle_struct *handle, connection_struct *conn, const char *path, uid_t uid, gid_t gid)
 125 {
 126         pstring cappath;
 127         capencode(cappath, path);
 128         return SMB_VFS_NEXT_CHOWN(handle, conn, cappath, uid, gid);
 129 }
 130
 131 static int cap_chdir(vfs_handle_struct *handle, connection_struct *conn, const char *path)
 132 {
 133         pstring cappath;
 134         DEBUG(3,("cap: cap_chdir for %s\n", path));
 135         capencode(cappath, path);
 136         return SMB_VFS_NEXT_CHDIR(handle, conn, cappath);
 137 }
 138
 139 static int cap_utime(vfs_handle_struct *handle, connection_struct *conn, const char *path, struct utimbuf *times)
 140 {
 141         pstring cappath;
 142         capencode(cappath, path);
 143         return SMB_VFS_NEXT_UTIME(handle, conn, cappath, times);
 144 }
 145
 146
 147 static BOOL cap_symlink(vfs_handle_struct *handle, connection_struct *conn, const char *oldpath, const char *newpath)
 148 {
 149         pstring capoldpath, capnewpath;
 150         capencode(capoldpath, oldpath);
 151         capencode(capnewpath, newpath);
 152         return SMB_VFS_NEXT_SYMLINK(handle, conn, capoldpath, capnewpath);
 153 }
 154
 155 static BOOL cap_readlink(vfs_handle_struct *handle, connection_struct *conn, const char *path, char *buf, size_t bufsiz)
 156 {
 157         pstring cappath;
 158         capencode(cappath, path);
 159         return SMB_VFS_NEXT_READLINK(handle, conn, cappath, buf, bufsiz);
 160 }
 161
 162 static int cap_link(vfs_handle_struct *handle, connection_struct *conn, const char *oldpath, const char *newpath)
 163 {
 164         pstring capoldpath, capnewpath;
 165         capencode(capoldpath, oldpath);
 166         capencode(capnewpath, newpath);
 167         return SMB_VFS_NEXT_LINK(handle, conn, capoldpath, capnewpath);
 168 }
 169
 170 static int cap_mknod(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode, SMB_DEV_T dev)
 171 {
 172         pstring cappath;
 173         capencode(cappath, path);
 174         return SMB_VFS_NEXT_MKNOD(handle, conn, cappath, mode, dev);
 175 }
 176
 177 static char *cap_realpath(vfs_handle_struct *handle, connection_struct *conn, const char *path, char *resolved_path)
 178 {
 179         /* monyo need capencode'ed and capdecode'ed? */
 180         pstring cappath;
 181         capencode(cappath, path);
 182         return SMB_VFS_NEXT_REALPATH(handle, conn, path, resolved_path);
 183 }
 184
 185 static BOOL cap_set_nt_acl(vfs_handle_struct *handle, files_struct *fsp, const char *name, uint32 security_info_sent, struct security_descriptor_info *psd)
 186 {
 187         pstring capname;
 188         capencode(capname, name);
 189         return SMB_VFS_NEXT_SET_NT_ACL(handle, fsp, capname, security_info_sent, psd);
 190 }
 191
 192 static int cap_chmod_acl(vfs_handle_struct *handle, connection_struct *conn, const char *name, mode_t mode)
 193 {
 194         pstring capname;
 195         capencode(capname, name);
 196
 197         /* If the underlying VFS doesn't have ACL support... */
 198         if (!handle->vfs_next.ops.chmod_acl) {
 199                 errno = ENOSYS;
 200                 return -1;
 201         }
 202         return SMB_VFS_NEXT_CHMOD_ACL(handle, conn, capname, mode);
 203 }
 204
 205 static SMB_ACL_T cap_sys_acl_get_file(vfs_handle_struct *handle, connection_struct *conn, const char *path_p, SMB_ACL_TYPE_T type)
 206 {
 207         pstring cappath_p;
 208         capencode(cappath_p, path_p);
 209         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(handle, conn, cappath_p, type);
 210 }
 211
 212 static int cap_sys_acl_set_file(vfs_handle_struct *handle, connection_struct *conn, const char *name, SMB_ACL_TYPE_T acltype, SMB_ACL_T theacl)
 213 {
 214         pstring capname;
 215         capencode(capname, name);
 216         return SMB_VFS_NEXT_SYS_ACL_SET_FILE(handle, conn, capname, acltype, theacl);
 217 }
 218
 219 static int cap_sys_acl_delete_def_file(vfs_handle_struct *handle, connection_struct *conn, const char *path)
 220 {
 221         pstring cappath;
 222         capencode(cappath, path);
 223         return SMB_VFS_NEXT_SYS_ACL_DELETE_DEF_FILE(handle, conn, cappath);
 224 }
 225
 226 static ssize_t cap_getxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name, void *value, size_t size)
 227 {
 228         pstring cappath, capname;
 229         capencode(cappath, path);
 230         capencode(capname, name);
 231         return SMB_VFS_NEXT_GETXATTR(handle, conn, cappath, capname, value, size);
 232 }
 233
 234 static ssize_t cap_lgetxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name, void *value, size_t
 235 size)
 236 {
 237         pstring cappath, capname;
 238         capencode(cappath, path);
 239         capencode(capname, name);
 240         return SMB_VFS_NEXT_LGETXATTR(handle, conn, cappath, capname, value, size);
 241 }
 242
 243 static ssize_t cap_fgetxattr(vfs_handle_struct *handle, struct files_struct *fsp,int fd, const char *name, void *value, size_t size)
 244 {
 245         pstring capname;
 246         capencode(capname, name);
 247         return SMB_VFS_NEXT_FGETXATTR(handle, fsp, fd, capname, value, size);
 248 }
 249
 250 static ssize_t cap_listxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, char *list, size_t size)
 251 {
 252         pstring cappath;
 253         capencode(cappath, path);
 254         return SMB_VFS_NEXT_LISTXATTR(handle, conn, cappath, list, size);
 255 }
 256
 257 static ssize_t cap_llistxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, char *list, size_t size)
 258 {
 259         pstring cappath;
 260         capencode(cappath, path);
 261         return SMB_VFS_NEXT_LLISTXATTR(handle, conn, cappath, list, size);
 262 }
 263
 264 static int cap_removexattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name)
 265 {
 266         pstring cappath, capname;
 267         capencode(cappath, path);
 268         capencode(capname, name);
 269         return SMB_VFS_NEXT_REMOVEXATTR(handle, conn, cappath, capname);
 270 }
 271
 272 static int cap_lremovexattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name)
 273 {
 274         pstring cappath, capname;
 275         capencode(cappath, path);
 276         capencode(capname, name);
 277         return SMB_VFS_NEXT_LREMOVEXATTR(handle, conn, cappath, capname);
 278 }
 279
 280 static int cap_fremovexattr(vfs_handle_struct *handle, struct files_struct *fsp,int fd, const char *name)
 281 {
 282         pstring capname;
 283         capencode(capname, name);
 284         return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, fd, capname);
 285 }
 286
 287 static int cap_setxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name, const void *value, size_t size, int flags)
 288 {
 289         pstring cappath, capname;
 290         capencode(cappath, path);
 291         capencode(capname, name);
 292         return SMB_VFS_NEXT_SETXATTR(handle, conn, cappath, capname, value, size, flags);
 293 }
 294
 295 static int cap_lsetxattr(vfs_handle_struct *handle, struct connection_struct *conn,const char *path, const char *name, const void *value, size_t size, int flags)
 296 {
 297         pstring cappath, capname;
 298         capencode(cappath, path);
 299         capencode(capname, name);
 300         return SMB_VFS_NEXT_LSETXATTR(handle, conn, cappath, capname, value, size, flags);
 301 }
 302
 303 static int cap_fsetxattr(vfs_handle_struct *handle, struct files_struct *fsp,int fd, const char *name, const void *value, size_t size, int flags)
 304 {
 305         pstring capname;
 306         capencode(capname, name);
 307         return SMB_VFS_NEXT_FSETXATTR(handle, fsp, fd, capname, value, size, flags);
 308 }
 309
 310 /* VFS operations structure */
 311
 312 static vfs_op_tuple cap_op_tuples[] = {
 313
 314         /* Disk operations */
 315
 316         {SMB_VFS_OP(cap_disk_free),                     SMB_VFS_OP_DISK_FREE,           SMB_VFS_LAYER_TRANSPARENT},
 317
 318         /* Directory operations */
 319
 320         {SMB_VFS_OP(cap_opendir),                       SMB_VFS_OP_OPENDIR,             SMB_VFS_LAYER_TRANSPARENT},
 321         {SMB_VFS_OP(cap_readdir),                       SMB_VFS_OP_READDIR,             SMB_VFS_LAYER_TRANSPARENT},
 322         {SMB_VFS_OP(cap_mkdir),                 SMB_VFS_OP_MKDIR,               SMB_VFS_LAYER_TRANSPARENT},
 323         {SMB_VFS_OP(cap_rmdir),                 SMB_VFS_OP_RMDIR,               SMB_VFS_LAYER_TRANSPARENT},
 324
 325         /* File operations */
 326
 327         {SMB_VFS_OP(cap_open),                          SMB_VFS_OP_OPEN,                SMB_VFS_LAYER_TRANSPARENT},
 328         {SMB_VFS_OP(cap_rename),                        SMB_VFS_OP_RENAME,              SMB_VFS_LAYER_TRANSPARENT},
 329         {SMB_VFS_OP(cap_stat),                          SMB_VFS_OP_STAT,                SMB_VFS_LAYER_TRANSPARENT},
 330         {SMB_VFS_OP(cap_lstat),                 SMB_VFS_OP_LSTAT,               SMB_VFS_LAYER_TRANSPARENT},
 331         {SMB_VFS_OP(cap_unlink),                        SMB_VFS_OP_UNLINK,              SMB_VFS_LAYER_TRANSPARENT},
 332         {SMB_VFS_OP(cap_chmod),                 SMB_VFS_OP_CHMOD,               SMB_VFS_LAYER_TRANSPARENT},
 333         {SMB_VFS_OP(cap_chown),                 SMB_VFS_OP_CHOWN,               SMB_VFS_LAYER_TRANSPARENT},
 334         {SMB_VFS_OP(cap_chdir),                 SMB_VFS_OP_CHDIR,               SMB_VFS_LAYER_TRANSPARENT},
 335         {SMB_VFS_OP(cap_utime),                 SMB_VFS_OP_UTIME,               SMB_VFS_LAYER_TRANSPARENT},
 336         {SMB_VFS_OP(cap_symlink),                       SMB_VFS_OP_SYMLINK,             SMB_VFS_LAYER_TRANSPARENT},
 337         {SMB_VFS_OP(cap_readlink),                      SMB_VFS_OP_READLINK,            SMB_VFS_LAYER_TRANSPARENT},
 338         {SMB_VFS_OP(cap_link),                          SMB_VFS_OP_LINK,                SMB_VFS_LAYER_TRANSPARENT},
 339         {SMB_VFS_OP(cap_mknod),                 SMB_VFS_OP_MKNOD,               SMB_VFS_LAYER_TRANSPARENT},
 340         {SMB_VFS_OP(cap_realpath),                      SMB_VFS_OP_REALPATH,            SMB_VFS_LAYER_TRANSPARENT},
 341
 342         /* NT File ACL operations */
 343
 344         {SMB_VFS_OP(cap_set_nt_acl),                    SMB_VFS_OP_SET_NT_ACL,          SMB_VFS_LAYER_TRANSPARENT},
 345
 346         /* POSIX ACL operations */
 347
 348         {SMB_VFS_OP(cap_chmod_acl),                     SMB_VFS_OP_CHMOD_ACL,           SMB_VFS_LAYER_TRANSPARENT},
 349
 350         {SMB_VFS_OP(cap_sys_acl_get_file),              SMB_VFS_OP_SYS_ACL_GET_FILE,            SMB_VFS_LAYER_TRANSPARENT},
 351         {SMB_VFS_OP(cap_sys_acl_set_file),              SMB_VFS_OP_SYS_ACL_SET_FILE,            SMB_VFS_LAYER_TRANSPARENT},
 352         {SMB_VFS_OP(cap_sys_acl_delete_def_file),       SMB_VFS_OP_SYS_ACL_DELETE_DEF_FILE,     SMB_VFS_LAYER_TRANSPARENT},
 353
 354         /* EA operations. */
 355         {SMB_VFS_OP(cap_getxattr),                      SMB_VFS_OP_GETXATTR,                    SMB_VFS_LAYER_TRANSPARENT},
 356         {SMB_VFS_OP(cap_lgetxattr),                     SMB_VFS_OP_LGETXATTR,                   SMB_VFS_LAYER_TRANSPARENT},
 357         {SMB_VFS_OP(cap_fgetxattr),                     SMB_VFS_OP_FGETXATTR,                   SMB_VFS_LAYER_TRANSPARENT},
 358         {SMB_VFS_OP(cap_listxattr),                     SMB_VFS_OP_LISTXATTR,                   SMB_VFS_LAYER_TRANSPARENT},
 359         {SMB_VFS_OP(cap_llistxattr),                    SMB_VFS_OP_LLISTXATTR,                  SMB_VFS_LAYER_TRANSPARENT},
 360         {SMB_VFS_OP(cap_removexattr),                   SMB_VFS_OP_REMOVEXATTR,                 SMB_VFS_LAYER_TRANSPARENT},
 361         {SMB_VFS_OP(cap_lremovexattr),                  SMB_VFS_OP_LREMOVEXATTR,                SMB_VFS_LAYER_TRANSPARENT},
 362         {SMB_VFS_OP(cap_fremovexattr),                  SMB_VFS_OP_FREMOVEXATTR,                SMB_VFS_LAYER_TRANSPARENT},
 363         {SMB_VFS_OP(cap_setxattr),                      SMB_VFS_OP_SETXATTR,                    SMB_VFS_LAYER_TRANSPARENT},
 364         {SMB_VFS_OP(cap_lsetxattr),                     SMB_VFS_OP_LSETXATTR,                   SMB_VFS_LAYER_TRANSPARENT},
 365         {SMB_VFS_OP(cap_fsetxattr),                     SMB_VFS_OP_FSETXATTR,                   SMB_VFS_LAYER_TRANSPARENT},
 366
 367         {NULL,                                          SMB_VFS_OP_NOOP,                        SMB_VFS_LAYER_NOOP}
 368 };
 369
 370 NTSTATUS vfs_cap_init(void)
 371 {
 372         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "cap", cap_op_tuples);
 373 }
 374
 375 /* For CAP functions */
 376 #define hex_tag ':'
 377 #define hex2bin(c)              hex2bin_table[(unsigned char)(c)]
 378 #define bin2hex(c)              bin2hex_table[(unsigned char)(c)]
 379 #define is_hex(s)               ((s)[0] == hex_tag)
 380
 381 static unsigned char hex2bin_table[256] = {
 382 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 */
 383 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 */
 384 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 */
 385 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 0, 0, 0, 0, 0, /* 0x30 */
 386 0000, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0000, /* 0x40 */
 387 0000, 0000, 0000, 0000, 0000, 0000, 0000, 0000,
 388 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 */
 389 0000, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0000, /* 0x60 */
 390 0000, 0000, 0000, 0000, 0000, 0000, 0000, 0000,
 391 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 */
 392 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 */
 393 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 */
 394 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 */
 395 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 */
 396 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 */
 397 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 */
 398 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 */
 399 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0  /* 0xf0 */
 400 };
 401 static unsigned char bin2hex_table[256] = "0123456789abcdef";
 402
 403 /*******************************************************************
 404   original code -> ":xx"  - CAP format
 405 ********************************************************************/
 406 static char *capencode(char *to, const char *from)
 407 {
 408   pstring cvtbuf;
 409   char *out;
 410
 411   if (to == from) {
 412     from = pstrcpy ((char *) cvtbuf, from);
 413   }
 414
 415   for (out = to; *from && (out - to < sizeof(pstring)-7);) {
 416     /* buffer husoku error */
 417     if ((unsigned char)*from >= 0x80) {
 418       *out++ = hex_tag;
 419       *out++ = bin2hex (((*from)>>4)&0x0f);
 420       *out++ = bin2hex ((*from)&0x0f);
 421       from++;
 422     }
 423     else {
 424       *out++ = *from++;
 425     }
 426   }
 427   *out = '\0';
 428   return to;
 429 }
 430
 431 /*******************************************************************
 432   CAP -> original code
 433 ********************************************************************/
 434 /* ":xx" -> a byte */
 435 static char *capdecode(char *to, const char *from)
 436 {
 437   pstring cvtbuf;
 438   char *out;
 439
 440   if (to == from) {
 441     from = pstrcpy ((char *) cvtbuf, from);
 442   }
 443   for (out = to; *from && (out - to < sizeof(pstring)-3);) {
 444     if (is_hex(from)) {
 445       *out++ = (hex2bin (from[1])<<4) | (hex2bin (from[2]));
 446       from += 3;
 447     } else {
 448       *out++ = *from++;
 449     }
 450   }
 451   *out = '\0';
 452   return to;
 453 }