source: MondoRescue/branches/stable/mindi-busybox/archival/libunarchive/get_header_tar.c @ 1770

Last change on this file since 1770 was 1770, checked in by Bruno Cornec, 12 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 8.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
3 *
4 *  FIXME:
5 *    In privileged mode if uname and gname map to a uid and gid then use the
6 *    mapped value instead of the uid/gid values in tar header
7 *
8 *  References:
9 *    GNU tar and star man pages,
10 *    Opengroup's ustar interchange format,
11 *  http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
12 */
13
14#include "libbb.h"
15#include "unarchive.h"
16
17#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
18static char *longname;
19static char *linkname;
20#else
21enum {
22    longname = 0,
23    linkname = 0,
24};
25#endif
26
27/* NB: _DESTROYS_ str[len] character! */
28static unsigned long long getOctal(char *str, int len)
29{
30    unsigned long long v;
31    /* Actually, tar header allows leading spaces also.
32     * Oh well, we will be liberal and skip this...
33     * The only downside probably is that we allow "-123" too :)
34    if (*str < '0' || *str > '7')
35        bb_error_msg_and_die("corrupted octal value in tar header");
36    */
37    str[len] = '\0';
38    v = strtoull(str, &str, 8);
39    if (*str && (!ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY || *str != ' '))
40        bb_error_msg_and_die("corrupted octal value in tar header");
41    return v;
42}
43#define GET_OCTAL(a) getOctal((a), sizeof(a))
44
45void BUG_tar_header_size(void);
46char get_header_tar(archive_handle_t *archive_handle)
47{
48    static smallint end;
49
50    file_header_t *file_header = archive_handle->file_header;
51    struct {
52        /* ustar header, Posix 1003.1 */
53        char name[100];     /*   0-99 */
54        char mode[8];       /* 100-107 */
55        char uid[8];        /* 108-115 */
56        char gid[8];        /* 116-123 */
57        char size[12];      /* 124-135 */
58        char mtime[12];     /* 136-147 */
59        char chksum[8];     /* 148-155 */
60        char typeflag;      /* 156-156 */
61        char linkname[100]; /* 157-256 */
62        char magic[6];      /* 257-262 */
63        char version[2];    /* 263-264 */
64        char uname[32];     /* 265-296 */
65        char gname[32];     /* 297-328 */
66        char devmajor[8];   /* 329-336 */
67        char devminor[8];   /* 337-344 */
68        char prefix[155];   /* 345-499 */
69        char padding[12];   /* 500-512 */
70    } tar;
71    char *cp;
72    int i, sum_u, sum;
73#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
74    int sum_s;
75#endif
76    int parse_names;
77
78    if (sizeof(tar) != 512)
79        BUG_tar_header_size();
80
81#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
82 again:
83#endif
84    /* Align header */
85    data_align(archive_handle, 512);
86
87 again_after_align:
88
89    xread(archive_handle->src_fd, &tar, 512);
90    archive_handle->offset += 512;
91
92    /* If there is no filename its an empty header */
93    if (tar.name[0] == 0) {
94        if (end) {
95            /* This is the second consecutive empty header! End of archive!
96             * Read until the end to empty the pipe from gz or bz2
97             */
98            while (full_read(archive_handle->src_fd, &tar, 512) == 512)
99                /* repeat */;
100            return EXIT_FAILURE;
101        }
102        end = 1;
103        return EXIT_SUCCESS;
104    }
105    end = 0;
106
107    /* Check header has valid magic, "ustar" is for the proper tar
108     * 0's are for the old tar format
109     */
110    if (strncmp(tar.magic, "ustar", 5) != 0) {
111#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
112        if (memcmp(tar.magic, "\0\0\0\0", 5) != 0)
113#endif
114            bb_error_msg_and_die("invalid tar magic");
115    }
116
117    /* Do checksum on headers.
118     * POSIX says that checksum is done on unsigned bytes, but
119     * Sun and HP-UX gets it wrong... more details in
120     * GNU tar source. */
121#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
122    sum_s = ' ' * sizeof(tar.chksum);
123#endif
124    sum_u = ' ' * sizeof(tar.chksum);
125    for (i = 0; i < 148; i++) {
126        sum_u += ((unsigned char*)&tar)[i];
127#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
128        sum_s += ((signed char*)&tar)[i];
129#endif
130    }
131    for (i = 156; i < 512; i++) {
132        sum_u += ((unsigned char*)&tar)[i];
133#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
134        sum_s += ((signed char*)&tar)[i];
135#endif
136    }
137#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
138    sum = strtoul(tar.chksum, &cp, 8);
139    if ((*cp && *cp != ' ')
140     || (sum_u != sum USE_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum))
141    ) {
142        bb_error_msg_and_die("invalid tar header checksum");
143    }
144#else
145    /* This field does not need special treatment (getOctal) */
146    sum = xstrtoul(tar.chksum, 8);
147    if (sum_u != sum USE_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum)) {
148        bb_error_msg_and_die("invalid tar header checksum");
149    }
150#endif
151
152    /* 0 is reserved for high perf file, treat as normal file */
153    if (!tar.typeflag) tar.typeflag = '0';
154    parse_names = (tar.typeflag >= '0' && tar.typeflag <= '7');
155
156    /* getOctal trashes subsequent field, therefore we call it
157     * on fields in reverse order */
158    if (tar.devmajor[0]) {
159        unsigned minor = GET_OCTAL(tar.devminor);
160        unsigned major = GET_OCTAL(tar.devmajor);
161        file_header->device = makedev(major, minor);
162    }
163    file_header->link_target = NULL;
164    if (!linkname && parse_names && tar.linkname[0]) {
165        /* we trash magic[0] here, it's ok */
166        tar.linkname[sizeof(tar.linkname)] = '\0';
167        file_header->link_target = xstrdup(tar.linkname);
168        /* FIXME: what if we have non-link object with link_target? */
169        /* Will link_target be free()ed? */
170    }
171    file_header->mtime = GET_OCTAL(tar.mtime);
172    file_header->size = GET_OCTAL(tar.size);
173    file_header->gid = GET_OCTAL(tar.gid);
174    file_header->uid = GET_OCTAL(tar.uid);
175    /* Set bits 0-11 of the files mode */
176    file_header->mode = 07777 & GET_OCTAL(tar.mode);
177
178    file_header->name = NULL;
179    if (!longname && parse_names) {
180        /* we trash mode[0] here, it's ok */
181        tar.name[sizeof(tar.name)] = '\0';
182        if (tar.prefix[0]) {
183            /* and padding[0] */
184            tar.prefix[sizeof(tar.prefix)] = '\0';
185            file_header->name = concat_path_file(tar.prefix, tar.name);
186        } else
187            file_header->name = xstrdup(tar.name);
188    }
189
190    /* Set bits 12-15 of the files mode */
191    /* (typeflag was not trashed because chksum does not use getOctal) */
192    switch (tar.typeflag) {
193    /* busybox identifies hard links as being regular files with 0 size and a link name */
194    case '1':
195        file_header->mode |= S_IFREG;
196        break;
197    case '7':
198    /* case 0: */
199    case '0':
200#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
201        if (last_char_is(file_header->name, '/')) {
202            file_header->mode |= S_IFDIR;
203        } else
204#endif
205        file_header->mode |= S_IFREG;
206        break;
207    case '2':
208        file_header->mode |= S_IFLNK;
209        break;
210    case '3':
211        file_header->mode |= S_IFCHR;
212        break;
213    case '4':
214        file_header->mode |= S_IFBLK;
215        break;
216    case '5':
217        file_header->mode |= S_IFDIR;
218        break;
219    case '6':
220        file_header->mode |= S_IFIFO;
221        break;
222#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
223    case 'L':
224        /* free: paranoia: tar with several consecutive longnames */
225        free(longname);
226        /* For paranoia reasons we allocate extra NUL char */
227        longname = xzalloc(file_header->size + 1);
228        /* We read ASCIZ string, including NUL */
229        xread(archive_handle->src_fd, longname, file_header->size);
230        archive_handle->offset += file_header->size;
231        /* return get_header_tar(archive_handle); */
232        /* gcc 4.1.1 didn't optimize it into jump */
233        /* so we will do it ourself, this also saves stack */
234        goto again;
235    case 'K':
236        free(linkname);
237        linkname = xzalloc(file_header->size + 1);
238        xread(archive_handle->src_fd, linkname, file_header->size);
239        archive_handle->offset += file_header->size;
240        /* return get_header_tar(archive_handle); */
241        goto again;
242    case 'D':   /* GNU dump dir */
243    case 'M':   /* Continuation of multi volume archive */
244    case 'N':   /* Old GNU for names > 100 characters */
245    case 'S':   /* Sparse file */
246    case 'V':   /* Volume header */
247#endif
248    case 'g':   /* pax global header */
249    case 'x': { /* pax extended header */
250        off_t sz;
251        bb_error_msg("warning: skipping header '%c'", tar.typeflag);
252        sz = (file_header->size + 511) & ~(off_t)511;
253        archive_handle->offset += sz;
254        sz >>= 9; /* sz /= 512 but w/o contortions for signed div */
255        while (sz--)
256            xread(archive_handle->src_fd, &tar, 512);
257        /* return get_header_tar(archive_handle); */
258        goto again_after_align;
259    }
260    default:
261        bb_error_msg_and_die("unknown typeflag: 0x%x", tar.typeflag);
262    }
263
264#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
265    if (longname) {
266        file_header->name = longname;
267        longname = NULL;
268    }
269    if (linkname) {
270        file_header->link_target = linkname;
271        linkname = NULL;
272    }
273#endif
274    if (!strncmp(file_header->name, "/../"+1, 3)
275     || strstr(file_header->name, "/../")
276    ) {
277        bb_error_msg_and_die("name with '..' encountered: '%s'",
278                file_header->name);
279    }
280
281    /* Strip trailing '/' in directories */
282    /* Must be done after mode is set as '/' is used to check if it's a directory */
283    cp = last_char_is(file_header->name, '/');
284
285    if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
286        archive_handle->action_header(archive_handle->file_header);
287        /* Note that we kill the '/' only after action_header() */
288        /* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */
289        if (cp) *cp = '\0';
290        archive_handle->flags |= ARCHIVE_EXTRACT_QUIET;
291        archive_handle->action_data(archive_handle);
292        llist_add_to(&(archive_handle->passed), file_header->name);
293    } else {
294        data_skip(archive_handle);
295        free(file_header->name);
296    }
297    archive_handle->offset += file_header->size;
298
299    free(file_header->link_target);
300    /* Do not free(file_header->name)! */
301
302    return EXIT_SUCCESS;
303}
Note: See TracBrowser for help on using the repository browser.