src/vfs/cpio/cpio.c

src/vfs/cpio/cpio.c
Manual pages: mc • mcdiff • mcedit • mcview
/* */
This source file includes following definitions.
cpio_defer_find
cpio_skip_padding
cpio_new_archive
cpio_free_archive
cpio_open_cpio_file
cpio_read_head
cpio_find_head
cpio_create_entry
cpio_read_bin_head
cpio_read_oldc_head
cpio_read_crc_head
cpio_open_archive
cpio_super_check
cpio_super_same
cpio_read
cpio_fh_open
vfs_init_cpiofs
   1 /*
   2    Virtual File System: GNU Tar file system.
   3 
   4    Copyright (C) 2000-2025
   5    Free Software Foundation, Inc.
   6 
   7    Written by:
   8    Jan Hudec, 2000
   9    Slava Zanko <slavazanko@gmail.com>, 2013
  10 
  11    This file is part of the Midnight Commander.
  12 
  13    The Midnight Commander is free software: you can redistribute it
  14    and/or modify it under the terms of the GNU General Public License as
  15    published by the Free Software Foundation, either version 3 of the License,
  16    or (at your option) any later version.
  17 
  18    The Midnight Commander is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22 
  23    You should have received a copy of the GNU General Public License
  24    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  25  */
  26 
  27 /** \file
  28  *  \brief Source: Virtual File System: GNU Tar file system.
  29  *  \author Jan Hudec
  30  *  \date 2000
  31  */
  32 
  33 #include <config.h>
  34 
  35 #include <errno.h>
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 
  39 #include "lib/global.h"
  40 #include "lib/unixcompat.h"
  41 #include "lib/util.h"
  42 #include "lib/widget.h"  // message()
  43 
  44 #include "lib/vfs/vfs.h"
  45 #include "lib/vfs/utilvfs.h"
  46 #include "lib/vfs/xdirentry.h"
  47 #include "lib/vfs/gc.h"  // vfs_rmstamp
  48 
  49 #include "cpio.h"
  50 
  51 /*** global variables ****************************************************************************/
  52 
  53 /*** file scope macro definitions ****************************************************************/
  54 
  55 #define CPIO_SUPER(super) ((cpio_super_t *) (super))
  56 
  57 #define CPIO_POS(super)   cpio_position
  58 /* If some time reentrancy should be needed change it to */
  59 /* #define CPIO_POS(super) (super)->u.arch.fd */
  60 
  61 #define CPIO_SEEK_SET(super, where)                                                                \
  62     mc_lseek (CPIO_SUPER (super)->fd, CPIO_POS (super) = (where), SEEK_SET)
  63 #define CPIO_SEEK_CUR(super, where)                                                                \
  64     mc_lseek (CPIO_SUPER (super)->fd, CPIO_POS (super) += (where), SEEK_SET)
  65 
  66 #define MAGIC_LENGTH (6)  // How many bytes we have to read ahead
  67 #define SEEKBACK     CPIO_SEEK_CUR (super, ptr - top)
  68 #define RETURN(x)    return (CPIO_SUPER (super)->type = (x))
  69 #define TYPEIS(x)    ((CPIO_SUPER (super)->type == CPIO_UNKNOWN) || (CPIO_SUPER (super)->type == (x)))
  70 
  71 #define HEAD_LENGTH  (26)
  72 
  73 /*** file scope type declarations ****************************************************************/
  74 
  75 enum
  76 {
  77     STATUS_START,
  78     STATUS_OK,
  79     STATUS_TRAIL,
  80     STATUS_FAIL,
  81     STATUS_EOF
  82 };
  83 
  84 enum
  85 {
  86     CPIO_UNKNOWN = 0,  // Not determined yet
  87     CPIO_BIN,          // Binary format
  88     CPIO_BINRE,        // Binary format, reverse endianness
  89     CPIO_OLDC,         // Old ASCII format
  90     CPIO_NEWC,         // New ASCII format
  91     CPIO_CRC           // New ASCII format + CRC
  92 };
  93 
  94 struct old_cpio_header
  95 {
  96     unsigned short c_magic;
  97     short c_dev;
  98     unsigned short c_ino;
  99     unsigned short c_mode;
 100     unsigned short c_uid;
 101     unsigned short c_gid;
 102     unsigned short c_nlink;
 103     short c_rdev;
 104     unsigned short c_mtimes[2];
 105     unsigned short c_namesize;
 106     unsigned short c_filesizes[2];
 107 };
 108 
 109 struct new_cpio_header
 110 {
 111     unsigned short c_magic;
 112     unsigned long c_ino;
 113     unsigned long c_mode;
 114     unsigned long c_uid;
 115     unsigned long c_gid;
 116     unsigned long c_nlink;
 117     unsigned long c_mtime;
 118     unsigned long c_filesize;
 119     long c_dev;
 120     long c_devmin;
 121     long c_rdev;
 122     long c_rdevmin;
 123     unsigned long c_namesize;
 124     unsigned long c_chksum;
 125 };
 126 
 127 typedef struct
 128 {
 129     unsigned long inumber;
 130     dev_t device;
 131     struct vfs_s_inode *inode;
 132 } defer_inode;
 133 
 134 typedef struct
 135 {
 136     struct vfs_s_super base;  // base class
 137 
 138     int fd;
 139     struct stat st;
 140     int type;          // Type of the archive
 141     GSList *deferred;  // List of inodes for which another entries may appear
 142 } cpio_super_t;
 143 
 144 /*** forward declarations (file scope functions) *************************************************/
 145 
 146 static ssize_t cpio_find_head (struct vfs_class *me, struct vfs_s_super *super);
 147 static ssize_t cpio_read_bin_head (struct vfs_class *me, struct vfs_s_super *super);
 148 static ssize_t cpio_read_oldc_head (struct vfs_class *me, struct vfs_s_super *super);
 149 static ssize_t cpio_read_crc_head (struct vfs_class *me, struct vfs_s_super *super);
 150 
 151 /*** file scope variables ************************************************************************/
 152 
 153 static struct vfs_s_subclass cpio_subclass;
 154 static struct vfs_class *vfs_cpiofs_ops = VFS_CLASS (&cpio_subclass);
 155 
 156 static off_t cpio_position;
 157 
 158 /* --------------------------------------------------------------------------------------------- */
 159 /*** file scope functions ************************************************************************/
 160 /* --------------------------------------------------------------------------------------------- */
 161 
 162 static int
 163 cpio_defer_find (const void *a, const void *b)
     /*   */
 164 {
 165     const defer_inode *a1 = (const defer_inode *) a;
 166     const defer_inode *b1 = (const defer_inode *) b;
 167 
 168     return (a1->inumber == b1->inumber && a1->device == b1->device) ? 0 : 1;
 169 }
 170 
 171 /* --------------------------------------------------------------------------------------------- */
 172 
 173 static ssize_t
 174 cpio_skip_padding (struct vfs_s_super *super)
     /*   */
 175 {
 176     switch (CPIO_SUPER (super)->type)
 177     {
 178     case CPIO_BIN:
 179     case CPIO_BINRE:
 180         return CPIO_SEEK_CUR (super, (2 - (CPIO_POS (super) % 2)) % 2);
 181     case CPIO_NEWC:
 182     case CPIO_CRC:
 183         return CPIO_SEEK_CUR (super, (4 - (CPIO_POS (super) % 4)) % 4);
 184     case CPIO_OLDC:
 185         return CPIO_POS (super);
 186     default:
 187         g_assert_not_reached ();
 188         return 42;  // & the compiler is happy :-)
 189     }
 190 }
 191 
 192 /* --------------------------------------------------------------------------------------------- */
 193 
 194 static struct vfs_s_super *
 195 cpio_new_archive (struct vfs_class *me)
     /*   */
 196 {
 197     cpio_super_t *arch;
 198 
 199     arch = g_new0 (cpio_super_t, 1);
 200     arch->base.me = me;
 201     arch->fd = -1;  // for now
 202     arch->type = CPIO_UNKNOWN;
 203 
 204     return VFS_SUPER (arch);
 205 }
 206 
 207 /* --------------------------------------------------------------------------------------------- */
 208 
 209 static void
 210 cpio_free_archive (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 211 {
 212     cpio_super_t *arch = CPIO_SUPER (super);
 213 
 214     (void) me;
 215 
 216     if (arch->fd != -1)
 217     {
 218         mc_close (arch->fd);
 219         arch->fd = -1;
 220     }
 221 
 222     g_clear_slist (&arch->deferred, g_free);
 223 }
 224 
 225 /* --------------------------------------------------------------------------------------------- */
 226 
 227 static int
 228 cpio_open_cpio_file (struct vfs_class *me, struct vfs_s_super *super, const vfs_path_t *vpath)
     /*   */
 229 {
 230     int fd, type;
 231     cpio_super_t *arch;
 232     mode_t mode;
 233     struct vfs_s_inode *root;
 234 
 235     fd = mc_open (vpath, O_RDONLY);
 236     if (fd == -1)
 237     {
 238         message (D_ERROR, MSG_ERROR, _ ("Cannot open cpio archive\n%s"), vfs_path_as_str (vpath));
 239         return -1;
 240     }
 241 
 242     super->name = g_strdup (vfs_path_as_str (vpath));
 243     arch = CPIO_SUPER (super);
 244     mc_stat (vpath, &arch->st);
 245 
 246     type = get_compression_type (fd, super->name);
 247     if (type == COMPRESSION_NONE)
 248         mc_lseek (fd, 0, SEEK_SET);
 249     else
 250     {
 251         char *s;
 252         vfs_path_t *tmp_vpath;
 253 
 254         mc_close (fd);
 255         s = g_strconcat (super->name, decompress_extension (type), (char *) NULL);
 256         tmp_vpath = vfs_path_from_str_flags (s, VPF_NO_CANON);
 257         fd = mc_open (tmp_vpath, O_RDONLY);
 258         vfs_path_free (tmp_vpath, TRUE);
 259         if (fd == -1)
 260         {
 261             message (D_ERROR, MSG_ERROR, _ ("Cannot open cpio archive\n%s"), s);
 262             g_free (s);
 263             MC_PTR_FREE (super->name);
 264             return -1;
 265         }
 266         g_free (s);
 267     }
 268 
 269     arch->fd = fd;
 270     mode = arch->st.st_mode & 07777;
 271     mode |= (mode & 0444) >> 2;  // set eXec where Read is
 272     mode |= S_IFDIR;
 273 
 274     root = vfs_s_new_inode (me, super, &arch->st);
 275     root->st.st_mode = mode;
 276     root->data_offset = -1;
 277     root->st.st_nlink++;
 278     root->st.st_dev = VFS_SUBCLASS (me)->rdev++;
 279 
 280     super->root = root;
 281 
 282     CPIO_SEEK_SET (super, 0);
 283 
 284     return fd;
 285 }
 286 
 287 /* --------------------------------------------------------------------------------------------- */
 288 
 289 static ssize_t
 290 cpio_read_head (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 291 {
 292     switch (cpio_find_head (me, super))
 293     {
 294     case CPIO_UNKNOWN:
 295         return -1;
 296     case CPIO_BIN:
 297     case CPIO_BINRE:
 298         return cpio_read_bin_head (me, super);
 299     case CPIO_OLDC:
 300         return cpio_read_oldc_head (me, super);
 301     case CPIO_NEWC:
 302     case CPIO_CRC:
 303         return cpio_read_crc_head (me, super);
 304     default:
 305         g_assert_not_reached ();
 306         return 42;  // & the compiler is happy :-)
 307     }
 308 }
 309 
 310 /* --------------------------------------------------------------------------------------------- */
 311 
 312 static ssize_t
 313 cpio_find_head (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 314 {
 315     cpio_super_t *arch = CPIO_SUPER (super);
 316     char buf[BUF_SMALL * 2];
 317     ssize_t ptr = 0;
 318     ssize_t top;
 319     ssize_t tmp;
 320 
 321     top = mc_read (arch->fd, buf, sizeof (buf));
 322     if (top > 0)
 323         CPIO_POS (super) += top;
 324 
 325     while (TRUE)
 326     {
 327         if (ptr + MAGIC_LENGTH >= top)
 328         {
 329             if (top > (ssize_t) (sizeof (buf) / 2))
 330             {
 331                 memmove (buf, buf + top - sizeof (buf) / 2, sizeof (buf) / 2);
 332                 ptr -= top - sizeof (buf) / 2;
 333                 top = sizeof (buf) / 2;
 334             }
 335             tmp = mc_read (arch->fd, buf, top);
 336             if (tmp == 0 || tmp == -1)
 337             {
 338                 message (D_ERROR, MSG_ERROR, _ ("Premature end of cpio archive\n%s"), super->name);
 339                 cpio_free_archive (me, super);
 340                 return CPIO_UNKNOWN;
 341             }
 342             top += tmp;
 343         }
 344         if (TYPEIS (CPIO_BIN) && ((*(unsigned short *) (buf + ptr)) == 070707))
 345         {
 346             SEEKBACK;
 347             RETURN (CPIO_BIN);
 348         }
 349         else if (TYPEIS (CPIO_BINRE)
 350                  && ((*(unsigned short *) (buf + ptr)) == GUINT16_SWAP_LE_BE_CONSTANT (070707)))
 351         {
 352             SEEKBACK;
 353             RETURN (CPIO_BINRE);
 354         }
 355         else if (TYPEIS (CPIO_OLDC) && (strncmp (buf + ptr, "070707", 6) == 0))
 356         {
 357             SEEKBACK;
 358             RETURN (CPIO_OLDC);
 359         }
 360         else if (TYPEIS (CPIO_NEWC) && (strncmp (buf + ptr, "070701", 6) == 0))
 361         {
 362             SEEKBACK;
 363             RETURN (CPIO_NEWC);
 364         }
 365         else if (TYPEIS (CPIO_CRC) && (strncmp (buf + ptr, "070702", 6) == 0))
 366         {
 367             SEEKBACK;
 368             RETURN (CPIO_CRC);
 369         };
 370         ptr++;
 371     }
 372 }
 373 
 374 /* --------------------------------------------------------------------------------------------- */
 375 
 376 static int
 377 cpio_create_entry (struct vfs_class *me, struct vfs_s_super *super, struct stat *st, char *name)
     /*   */
 378 {
 379     cpio_super_t *arch = CPIO_SUPER (super);
 380     struct vfs_s_inode *inode = NULL;
 381     struct vfs_s_inode *root = super->root;
 382     struct vfs_s_entry *entry = NULL;
 383     char *tn;
 384 
 385     switch (st->st_mode & S_IFMT)
 386     {  // For case of HP/UX archives
 387     case S_IFCHR:
 388     case S_IFBLK:
 389 #ifdef S_IFSOCK
 390     case S_IFSOCK:
 391 #endif
 392 #ifdef S_IFIFO
 393     case S_IFIFO:
 394 #endif
 395 #ifdef S_IFNAM
 396     case S_IFNAM:
 397 #endif
 398 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 399         if ((st->st_size != 0) && (st->st_rdev == 0x0001))
 400         {
 401             // FIXME: representation of major/minor differs between different operating systems
 402             st->st_rdev = (unsigned) st->st_size;
 403             st->st_size = 0;
 404         }
 405 #endif
 406         break;
 407     default:
 408         break;
 409     }
 410 
 411     if ((st->st_nlink > 1) && ((arch->type == CPIO_NEWC) || (arch->type == CPIO_CRC)))
 412     {  // For case of hardlinked files
 413         defer_inode i = { st->st_ino, st->st_dev, NULL };
 414         GSList *l;
 415 
 416         l = g_slist_find_custom (arch->deferred, &i, cpio_defer_find);
 417         if (l != NULL)
 418         {
 419             inode = ((defer_inode *) l->data)->inode;
 420             if (inode->st.st_size != 0 && st->st_size != 0 && (inode->st.st_size != st->st_size))
 421             {
 422                 message (D_ERROR, MSG_ERROR,
 423                          _ ("Inconsistent hardlinks of\n%s\nin cpio archive\n%s"), name,
 424                          super->name);
 425                 inode = NULL;
 426             }
 427             else if (inode->st.st_size == 0)
 428                 inode->st.st_size = st->st_size;
 429         }
 430     }
 431 
 432     // remove trailing slashes
 433     for (tn = name + strlen (name) - 1; tn >= name && IS_PATH_SEP (*tn); tn--)
 434         *tn = '\0';
 435 
 436     tn = strrchr (name, PATH_SEP);
 437     if (tn == NULL)
 438         tn = name;
 439     else if (tn == name + 1)
 440     {
 441         // started with "./" -- directory in the root of archive
 442         tn++;
 443     }
 444     else
 445     {
 446         *tn = '\0';
 447         root = vfs_s_find_inode (me, super, name, LINK_FOLLOW, FL_MKDIR);
 448         *tn = PATH_SEP;
 449         tn++;
 450     }
 451 
 452     entry = VFS_SUBCLASS (me)->find_entry (me, root, tn, LINK_FOLLOW,
 453                                            FL_NONE);  // In case entry is already there
 454 
 455     if (entry != NULL)
 456     {
 457         /* This shouldn't happen! (well, it can happen if there is a record for a
 458            file and then a record for a directory it is in; cpio would die with
 459            'No such file or directory' is such case) */
 460 
 461         if (!S_ISDIR (entry->ino->st.st_mode))
 462         {
 463             // This can be considered archive inconsistency
 464             message (D_ERROR, MSG_ERROR, _ ("%s contains duplicate entries! Skipping!"),
 465                      super->name);
 466         }
 467         else
 468         {
 469             entry->ino->st.st_mode = st->st_mode;
 470             entry->ino->st.st_uid = st->st_uid;
 471             entry->ino->st.st_gid = st->st_gid;
 472 
 473             vfs_copy_stat_times (st, &entry->ino->st);
 474         }
 475 
 476         g_free (name);
 477     }
 478     else
 479     {  // !entry
 480         /* root == NULL can be in the following case:
 481          * a/b/c -> d
 482          * where 'a/b' is the stale link and therefore root of 'c' cannot be found in the archive
 483          */
 484         if (root != NULL)
 485         {
 486             if (inode == NULL)
 487             {
 488                 inode = vfs_s_new_inode (me, super, st);
 489                 if ((st->st_nlink > 0) && ((arch->type == CPIO_NEWC) || (arch->type == CPIO_CRC)))
 490                 {
 491                     // For case of hardlinked files
 492                     defer_inode *i;
 493 
 494                     i = g_new (defer_inode, 1);
 495                     i->inumber = st->st_ino;
 496                     i->device = st->st_dev;
 497                     i->inode = inode;
 498 
 499                     arch->deferred = g_slist_prepend (arch->deferred, i);
 500                 }
 501             }
 502 
 503             if (st->st_size != 0)
 504                 inode->data_offset = CPIO_POS (super);
 505 
 506             entry = vfs_s_new_entry (me, tn, inode);
 507             vfs_s_insert_entry (me, root, entry);
 508         }
 509 
 510         g_free (name);
 511 
 512         if (!S_ISLNK (st->st_mode))
 513             CPIO_SEEK_CUR (super, st->st_size);
 514         else
 515         {
 516             if (inode != NULL)
 517             {
 518                 // FIXME: do we must read from arch->fd in case of inode != NULL only or in any
 519                 // case?
 520 
 521                 inode->linkname = g_malloc (st->st_size + 1);
 522 
 523                 if (mc_read (arch->fd, inode->linkname, st->st_size) < st->st_size)
 524                 {
 525                     inode->linkname[0] = '\0';
 526                     return STATUS_EOF;
 527                 }
 528 
 529                 inode->linkname[st->st_size] = '\0';  // Linkname stored without terminating \0 !!!
 530             }
 531 
 532             CPIO_POS (super) += st->st_size;
 533             cpio_skip_padding (super);
 534         }
 535     }  // !entry
 536 
 537     return STATUS_OK;
 538 }
 539 
 540 /* --------------------------------------------------------------------------------------------- */
 541 
 542 static ssize_t
 543 cpio_read_bin_head (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 544 {
 545     union
 546     {
 547         struct old_cpio_header buf;
 548         short shorts[HEAD_LENGTH >> 1];
 549     } u;
 550 
 551     cpio_super_t *arch = CPIO_SUPER (super);
 552     ssize_t len;
 553     char *name;
 554     struct stat st;
 555 
 556     len = mc_read (arch->fd, (char *) &u.buf, HEAD_LENGTH);
 557     if (len < HEAD_LENGTH)
 558         return STATUS_EOF;
 559     CPIO_POS (super) += len;
 560     if (arch->type == CPIO_BINRE)
 561     {
 562         int i;
 563 
 564         for (i = 0; i < (HEAD_LENGTH >> 1); i++)
 565             u.shorts[i] = GUINT16_SWAP_LE_BE_CONSTANT (u.shorts[i]);
 566     }
 567 
 568     if (u.buf.c_magic != 070707 || u.buf.c_namesize == 0 || u.buf.c_namesize > MC_MAXPATHLEN)
 569     {
 570         message (D_ERROR, MSG_ERROR, _ ("Corrupted cpio header encountered in\n%s"), super->name);
 571         return STATUS_FAIL;
 572     }
 573     name = g_malloc (u.buf.c_namesize);
 574     len = mc_read (arch->fd, name, u.buf.c_namesize);
 575     if (len < u.buf.c_namesize)
 576     {
 577         g_free (name);
 578         return STATUS_EOF;
 579     }
 580     name[u.buf.c_namesize - 1] = '\0';
 581     CPIO_POS (super) += len;
 582     cpio_skip_padding (super);
 583 
 584     if (strcmp ("TRAILER!!!", name) == 0)
 585     {  // We got to the last record
 586         g_free (name);
 587         return STATUS_TRAIL;
 588     }
 589 
 590     st.st_dev = u.buf.c_dev;
 591     st.st_ino = u.buf.c_ino;
 592     st.st_mode = u.buf.c_mode;
 593     st.st_nlink = u.buf.c_nlink;
 594     st.st_uid = u.buf.c_uid;
 595     st.st_gid = u.buf.c_gid;
 596 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 597     st.st_rdev = u.buf.c_rdev;
 598 #endif
 599     st.st_size = ((off_t) u.buf.c_filesizes[0] << 16) | u.buf.c_filesizes[1];
 600 
 601     vfs_zero_stat_times (&st);
 602 
 603     st.st_atime = st.st_mtime = st.st_ctime =
 604         ((time_t) u.buf.c_mtimes[0] << 16) | u.buf.c_mtimes[1];
 605 
 606     return cpio_create_entry (me, super, &st, name);
 607 }
 608 
 609 /* --------------------------------------------------------------------------------------------- */
 610 
 611 #undef HEAD_LENGTH
 612 #define HEAD_LENGTH (76)
 613 
 614 static ssize_t
 615 cpio_read_oldc_head (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 616 {
 617     cpio_super_t *arch = CPIO_SUPER (super);
 618     struct new_cpio_header hd;
 619     union
 620     {
 621         struct stat st;
 622         char buf[HEAD_LENGTH + 1];
 623     } u;
 624     ssize_t len;
 625     char *name;
 626 
 627     if (mc_read (arch->fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH)
 628         return STATUS_EOF;
 629     CPIO_POS (super) += HEAD_LENGTH;
 630     u.buf[HEAD_LENGTH] = 0;
 631 
 632     if (sscanf (u.buf, "070707%6lo%6lo%6lo%6lo%6lo%6lo%6lo%11lo%6lo%11lo",
 633                 (unsigned long *) &hd.c_dev, &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid,
 634                 &hd.c_nlink, (unsigned long *) &hd.c_rdev, &hd.c_mtime, &hd.c_namesize,
 635                 &hd.c_filesize)
 636         < 10)
 637     {
 638         message (D_ERROR, MSG_ERROR, _ ("Corrupted cpio header encountered in\n%s"), super->name);
 639         return STATUS_FAIL;
 640     }
 641 
 642     if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN)
 643     {
 644         message (D_ERROR, MSG_ERROR, _ ("Corrupted cpio header encountered in\n%s"), super->name);
 645         return STATUS_FAIL;
 646     }
 647     name = g_malloc (hd.c_namesize);
 648     len = mc_read (arch->fd, name, hd.c_namesize);
 649     if ((len == -1) || ((unsigned long) len < hd.c_namesize))
 650     {
 651         g_free (name);
 652         return STATUS_EOF;
 653     }
 654     name[hd.c_namesize - 1] = '\0';
 655     CPIO_POS (super) += len;
 656     cpio_skip_padding (super);
 657 
 658     if (strcmp ("TRAILER!!!", name) == 0)
 659     {  // We got to the last record
 660         g_free (name);
 661         return STATUS_TRAIL;
 662     }
 663 
 664     u.st.st_dev = hd.c_dev;
 665     u.st.st_ino = hd.c_ino;
 666     u.st.st_mode = hd.c_mode;
 667     u.st.st_nlink = hd.c_nlink;
 668     u.st.st_uid = hd.c_uid;
 669     u.st.st_gid = hd.c_gid;
 670 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 671     u.st.st_rdev = hd.c_rdev;
 672 #endif
 673     u.st.st_size = hd.c_filesize;
 674 
 675     vfs_zero_stat_times (&u.st);
 676     u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
 677 
 678     return cpio_create_entry (me, super, &u.st, name);
 679 }
 680 
 681 /* --------------------------------------------------------------------------------------------- */
 682 
 683 #undef HEAD_LENGTH
 684 #define HEAD_LENGTH (110)
 685 
 686 static ssize_t
 687 cpio_read_crc_head (struct vfs_class *me, struct vfs_s_super *super)
     /*   */
 688 {
 689     cpio_super_t *arch = CPIO_SUPER (super);
 690     struct new_cpio_header hd;
 691     union
 692     {
 693         struct stat st;
 694         char buf[HEAD_LENGTH + 1];
 695     } u;
 696     ssize_t len;
 697     char *name;
 698 
 699     if (mc_read (arch->fd, u.buf, HEAD_LENGTH) != HEAD_LENGTH)
 700         return STATUS_EOF;
 701 
 702     CPIO_POS (super) += HEAD_LENGTH;
 703     u.buf[HEAD_LENGTH] = '\0';
 704 
 705     if (sscanf (u.buf, "%6ho%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx%8lx", &hd.c_magic,
 706                 &hd.c_ino, &hd.c_mode, &hd.c_uid, &hd.c_gid, &hd.c_nlink, &hd.c_mtime,
 707                 &hd.c_filesize, (unsigned long *) &hd.c_dev, (unsigned long *) &hd.c_devmin,
 708                 (unsigned long *) &hd.c_rdev, (unsigned long *) &hd.c_rdevmin, &hd.c_namesize,
 709                 &hd.c_chksum)
 710         < 14)
 711     {
 712         message (D_ERROR, MSG_ERROR, _ ("Corrupted cpio header encountered in\n%s"), super->name);
 713         return STATUS_FAIL;
 714     }
 715 
 716     if ((arch->type == CPIO_NEWC && hd.c_magic != 070701)
 717         || (arch->type == CPIO_CRC && hd.c_magic != 070702))
 718         return STATUS_FAIL;
 719 
 720     if (hd.c_namesize == 0 || hd.c_namesize > MC_MAXPATHLEN)
 721     {
 722         message (D_ERROR, MSG_ERROR, _ ("Corrupted cpio header encountered in\n%s"), super->name);
 723         return STATUS_FAIL;
 724     }
 725 
 726     name = g_malloc (hd.c_namesize);
 727     len = mc_read (arch->fd, name, hd.c_namesize);
 728 
 729     if ((len == -1) || ((unsigned long) len < hd.c_namesize))
 730     {
 731         g_free (name);
 732         return STATUS_EOF;
 733     }
 734     name[hd.c_namesize - 1] = '\0';
 735     CPIO_POS (super) += len;
 736     cpio_skip_padding (super);
 737 
 738     if (strcmp ("TRAILER!!!", name) == 0)
 739     {  // We got to the last record
 740         g_free (name);
 741         return STATUS_TRAIL;
 742     }
 743 
 744     u.st.st_dev = makedev (hd.c_dev, hd.c_devmin);
 745     u.st.st_ino = hd.c_ino;
 746     u.st.st_mode = hd.c_mode;
 747     u.st.st_nlink = hd.c_nlink;
 748     u.st.st_uid = hd.c_uid;
 749     u.st.st_gid = hd.c_gid;
 750 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 751     u.st.st_rdev = makedev (hd.c_rdev, hd.c_rdevmin);
 752 #endif
 753     u.st.st_size = hd.c_filesize;
 754 
 755     vfs_zero_stat_times (&u.st);
 756     u.st.st_atime = u.st.st_mtime = u.st.st_ctime = hd.c_mtime;
 757 
 758     return cpio_create_entry (me, super, &u.st, name);
 759 }
 760 
 761 /* --------------------------------------------------------------------------------------------- */
 762 /** Need to CPIO_SEEK_CUR to skip the file at the end of add entry!!!! */
 763 
 764 static int
 765 cpio_open_archive (struct vfs_s_super *super, const vfs_path_t *vpath,
     /*   */
 766                    const vfs_path_element_t *vpath_element)
 767 {
 768     (void) vpath_element;
 769 
 770     if (cpio_open_cpio_file (vpath_element->class, super, vpath) == -1)
 771         return -1;
 772 
 773     while (TRUE)
 774     {
 775         ssize_t status;
 776 
 777         status = cpio_read_head (vpath_element->class, super);
 778         if (status < 0)
 779             return (-1);
 780 
 781         switch (status)
 782         {
 783         case STATUS_EOF:
 784         {
 785             message (D_ERROR, MSG_ERROR, _ ("Unexpected end of file\n%s"), vfs_path_as_str (vpath));
 786             return 0;
 787         }
 788         case STATUS_OK:
 789             continue;
 790         case STATUS_TRAIL:
 791             break;
 792         default:
 793             break;
 794         }
 795         break;
 796     }
 797 
 798     return 0;
 799 }
 800 
 801 /* --------------------------------------------------------------------------------------------- */
 802 /** Remaining functions are exactly same as for tarfs (and were in fact just copied) */
 803 
 804 static void *
 805 cpio_super_check (const vfs_path_t *vpath)
     /*   */
 806 {
 807     static struct stat sb;
 808     int stat_result;
 809 
 810     stat_result = mc_stat (vpath, &sb);
 811     return (stat_result == 0 ? &sb : NULL);
 812 }
 813 
 814 /* --------------------------------------------------------------------------------------------- */
 815 
 816 static int
 817 cpio_super_same (const vfs_path_element_t *vpath_element, struct vfs_s_super *parc,
     /*   */
 818                  const vfs_path_t *vpath, void *cookie)
 819 {
 820     struct stat *archive_stat = cookie;  // stat of main archive
 821 
 822     (void) vpath_element;
 823 
 824     if (strcmp (parc->name, vfs_path_as_str (vpath)))
 825         return 0;
 826 
 827     // Has the cached archive been changed on the disk?
 828     if (parc != NULL && CPIO_SUPER (parc)->st.st_mtime < archive_stat->st_mtime)
 829     {
 830         // Yes, reload!
 831         vfs_cpiofs_ops->free ((vfsid) parc);
 832         vfs_rmstamp (vfs_cpiofs_ops, (vfsid) parc);
 833         return 2;
 834     }
 835 
 836     // Hasn't been modified, give it a new timeout
 837     vfs_stamp (vfs_cpiofs_ops, (vfsid) parc);
 838     return 1;
 839 }
 840 
 841 /* --------------------------------------------------------------------------------------------- */
 842 
 843 static ssize_t
 844 cpio_read (void *fh, char *buffer, size_t count)
     /*   */
 845 {
 846     vfs_file_handler_t *file = VFS_FILE_HANDLER (fh);
 847     struct vfs_class *me = VFS_FILE_HANDLER_SUPER (fh)->me;
 848     int fd = CPIO_SUPER (VFS_FILE_HANDLER_SUPER (fh))->fd;
 849     off_t begin = file->ino->data_offset;
 850     ssize_t res;
 851 
 852     if (mc_lseek (fd, begin + file->pos, SEEK_SET) != begin + file->pos)
 853         ERRNOR (EIO, -1);
 854 
 855     count = MIN (count, (size_t) (file->ino->st.st_size - file->pos));
 856 
 857     res = mc_read (fd, buffer, count);
 858     if (res == -1)
 859         ERRNOR (errno, -1);
 860 
 861     file->pos += res;
 862     return res;
 863 }
 864 
 865 /* --------------------------------------------------------------------------------------------- */
 866 
 867 static int
 868 cpio_fh_open (struct vfs_class *me, vfs_file_handler_t *fh, int flags, mode_t mode)
     /*   */
 869 {
 870     (void) fh;
 871     (void) mode;
 872 
 873     if ((flags & O_ACCMODE) != O_RDONLY)
 874         ERRNOR (EROFS, -1);
 875     return 0;
 876 }
 877 
 878 /* --------------------------------------------------------------------------------------------- */
 879 /*** public functions ****************************************************************************/
 880 /* --------------------------------------------------------------------------------------------- */
 881 
 882 void
 883 vfs_init_cpiofs (void)
     /*   */
 884 {
 885     // FIXME: cpiofs used own temp files
 886     vfs_init_subclass (&cpio_subclass, "cpiofs", VFSF_READONLY, "ucpio");
 887     vfs_cpiofs_ops->read = cpio_read;
 888     vfs_cpiofs_ops->setctl = NULL;
 889     cpio_subclass.archive_check = cpio_super_check;
 890     cpio_subclass.archive_same = cpio_super_same;
 891     cpio_subclass.new_archive = cpio_new_archive;
 892     cpio_subclass.open_archive = cpio_open_archive;
 893     cpio_subclass.free_archive = cpio_free_archive;
 894     cpio_subclass.fh_open = cpio_fh_open;
 895     vfs_register_class (vfs_cpiofs_ops);
 896 }
 897 
 898 /* --------------------------------------------------------------------------------------------- */
/* */
root/src/vfs/cpio/cpio.c

DEFINITIONS
