blob: ba43bb0734a5b51b9351ccbc0739413f5380da07 [file] [log] [blame]
"Robert P. J. Day"63fc1a92006-07-02 19:47:05 +00001/* vi: set sw=4 ts=4: */
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02002/* Licensed under GPLv2 or later, see file LICENSE in this source tree.
Glenn L McGrath6aa52232004-02-17 11:55:06 +00003 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02004 * FIXME:
Eric Andersenaff114c2004-04-14 17:51:38 +00005 * In privileged mode if uname and gname map to a uid and gid then use the
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +00006 * mapped value instead of the uid/gid values in tar header
Glenn L McGrathb0e163a2004-02-19 08:48:30 +00007 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02008 * References:
Glenn L McGrathb0e163a2004-02-19 08:48:30 +00009 * GNU tar and star man pages,
10 * Opengroup's ustar interchange format,
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +020011 * http://www.opengroup.org/onlinepubs/007904975/utilities/pax.html
Glenn L McGrath95ebf612001-10-25 14:18:08 +000012 */
13
Glenn L McGrath95ebf612001-10-25 14:18:08 +000014#include "libbb.h"
Denys Vlasenkod184a722011-09-22 12:45:14 +020015#include "bb_archive.h"
Glenn L McGrath95ebf612001-10-25 14:18:08 +000016
Denys Vlasenko98a4c7c2010-02-04 15:00:15 +010017typedef uint32_t aliased_uint32_t FIX_ALIASING;
18typedef off_t aliased_off_t FIX_ALIASING;
19
20
Denys Vlasenkob80acf52011-03-02 01:21:02 +010021const char* FAST_FUNC strip_unsafe_prefix(const char *str)
22{
23 const char *cp = str;
24 while (1) {
25 char *cp2;
26 if (*cp == '/') {
27 cp++;
28 continue;
29 }
30 if (strncmp(cp, "/../"+1, 3) == 0) {
31 cp += 3;
32 continue;
33 }
34 cp2 = strstr(cp, "/../");
35 if (!cp2)
36 break;
37 cp = cp2 + 4;
38 }
39 if (cp != str) {
40 static smallint warned = 0;
41 if (!warned) {
42 warned = 1;
43 bb_error_msg("removing leading '%.*s' from member names",
44 (int)(cp - str), str);
45 }
46 }
47 return cp;
48}
49
Denis Vlasenko376ce1e2006-11-24 14:51:01 +000050/* NB: _DESTROYS_ str[len] character! */
51static unsigned long long getOctal(char *str, int len)
52{
53 unsigned long long v;
Denys Vlasenko7b48eb42010-05-06 20:08:14 +020054 char *end;
Denis Vlasenkoa60936d2008-06-28 05:04:09 +000055 /* NB: leading spaces are allowed. Using strtoull to handle that.
Denys Vlasenko8d338172009-09-23 17:16:37 +020056 * The downside is that we accept e.g. "-123" too :(
Denis Vlasenkoa60936d2008-06-28 05:04:09 +000057 */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +000058 str[len] = '\0';
Denys Vlasenko7b48eb42010-05-06 20:08:14 +020059 v = strtoull(str, &end, 8);
Denys Vlasenko8d338172009-09-23 17:16:37 +020060 /* std: "Each numeric field is terminated by one or more
61 * <space> or NUL characters". We must support ' '! */
Denys Vlasenko7b48eb42010-05-06 20:08:14 +020062 if (*end != '\0' && *end != ' ') {
63 int8_t first = str[0];
64 if (!(first & 0x80))
65 bb_error_msg_and_die("corrupted octal value in tar header");
66 /*
67 * GNU tar uses "base-256 encoding" for very large numbers.
68 * Encoding is binary, with highest bit always set as a marker
69 * and sign in next-highest bit:
70 * 80 00 .. 00 - zero
71 * bf ff .. ff - largest positive number
72 * ff ff .. ff - minus 1
73 * c0 00 .. 00 - smallest negative number
74 *
75 * Example of tar file with 8914993153 (0x213600001) byte file.
76 * Field starts at offset 7c:
77 * 00070 30 30 30 00 30 30 30 30 30 30 30 00 80 00 00 00 |000.0000000.....|
78 * 00080 00 00 00 02 13 60 00 01 31 31 31 32 30 33 33 36 |.....`..11120336|
79 *
80 * NB: tarballs with NEGATIVE unix times encoded that way were seen!
81 */
Denys Vlasenkof74f2802011-10-19 14:51:12 +020082 /* Sign-extend 7bit 'first' to 64bit 'v' (that is, using 6th bit as sign): */
83 first <<= 1;
84 first >>= 1; /* now 7th bit = 6th bit */
85 v = first; /* sign-extend 8 bits to 64 */
Denys Vlasenko7b48eb42010-05-06 20:08:14 +020086 while (--len != 0)
Etienne Le Sueurcfc212c2012-06-09 08:37:05 +020087 v = (v << 8) + (uint8_t) *++str;
Denys Vlasenko7b48eb42010-05-06 20:08:14 +020088 }
Denis Vlasenko376ce1e2006-11-24 14:51:01 +000089 return v;
90}
Denis Vlasenkob5963352006-11-26 01:46:59 +000091#define GET_OCTAL(a) getOctal((a), sizeof(a))
Denis Vlasenko376ce1e2006-11-24 14:51:01 +000092
Denys Vlasenko6111f962012-02-23 13:45:18 +010093/* "global" is 0 or 1 */
94static void process_pax_hdr(archive_handle_t *archive_handle, unsigned sz, int global)
J. Tang77a2c512010-03-19 14:48:51 +010095{
96 char *buf, *p;
Denys Vlasenko6111f962012-02-23 13:45:18 +010097 unsigned blk_sz;
J. Tang77a2c512010-03-19 14:48:51 +010098
Denys Vlasenko6111f962012-02-23 13:45:18 +010099 blk_sz = (sz + 511) & (~511);
100 p = buf = xmalloc(blk_sz + 1);
101 xread(archive_handle->src_fd, buf, blk_sz);
102 archive_handle->offset += blk_sz;
103
J. Tang77a2c512010-03-19 14:48:51 +0100104 /* prevent bb_strtou from running off the buffer */
105 buf[sz] = '\0';
J. Tang77a2c512010-03-19 14:48:51 +0100106
J. Tang77a2c512010-03-19 14:48:51 +0100107 while (sz != 0) {
108 char *end, *value;
109 unsigned len;
110
111 /* Every record has this format: "LEN NAME=VALUE\n" */
112 len = bb_strtou(p, &end, 10);
113 /* expect errno to be EINVAL, because the character
114 * following the digits should be a space
115 */
116 p += len;
117 sz -= len;
Denys Vlasenko0f592d72014-01-10 18:02:38 +0100118 if (
119 /** (int)sz < 0 - not good enough for huge malicious VALUE of 2^32-1 */
120 (int)(sz|len) < 0 /* this works */
J. Tang77a2c512010-03-19 14:48:51 +0100121 || len == 0
122 || errno != EINVAL
123 || *end != ' '
124 ) {
125 bb_error_msg("malformed extended header, skipped");
126 // More verbose version:
127 //bb_error_msg("malformed extended header at %"OFF_FMT"d, skipped",
128 // archive_handle->offset - (sz + len));
129 break;
130 }
131 /* overwrite the terminating newline with NUL
132 * (we do not bother to check that it *was* a newline)
133 */
134 p[-1] = '\0';
J. Tang77a2c512010-03-19 14:48:51 +0100135 value = end + 1;
Denys Vlasenko6111f962012-02-23 13:45:18 +0100136
137#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
138 if (!global && strncmp(value, "path=", sizeof("path=") - 1) == 0) {
139 value += sizeof("path=") - 1;
140 free(archive_handle->tar__longname);
141 archive_handle->tar__longname = xstrdup(value);
142 continue;
143 }
144#endif
145
146#if ENABLE_FEATURE_TAR_SELINUX
147 /* Scan for SELinux contexts, via "RHT.security.selinux" keyword.
148 * This is what Red Hat's patched version of tar uses.
149 */
150# define SELINUX_CONTEXT_KEYWORD "RHT.security.selinux"
J. Tang77a2c512010-03-19 14:48:51 +0100151 if (strncmp(value, SELINUX_CONTEXT_KEYWORD"=", sizeof(SELINUX_CONTEXT_KEYWORD"=") - 1) == 0) {
152 value += sizeof(SELINUX_CONTEXT_KEYWORD"=") - 1;
Denys Vlasenko6111f962012-02-23 13:45:18 +0100153 free(archive_handle->tar__sctx[global]);
154 archive_handle->tar__sctx[global] = xstrdup(value);
155 continue;
J. Tang77a2c512010-03-19 14:48:51 +0100156 }
Denys Vlasenko6111f962012-02-23 13:45:18 +0100157#endif
J. Tang77a2c512010-03-19 14:48:51 +0100158 }
159
160 free(buf);
J. Tang77a2c512010-03-19 14:48:51 +0100161}
J. Tang77a2c512010-03-19 14:48:51 +0100162
Denis Vlasenkodefc1ea2008-06-27 02:52:20 +0000163char FAST_FUNC get_header_tar(archive_handle_t *archive_handle)
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000164{
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000165 file_header_t *file_header = archive_handle->file_header;
Denys Vlasenko52827e32010-06-26 18:21:36 +0200166 struct tar_header_t tar;
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000167 char *cp;
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000168 int i, sum_u, sum;
169#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
170 int sum_s;
171#endif
Denis Vlasenkod6772502006-11-24 17:21:44 +0000172 int parse_names;
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000173
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000174 /* Our "private data" */
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000175#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100176# define p_longname (archive_handle->tar__longname)
177# define p_linkname (archive_handle->tar__linkname)
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000178#else
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100179# define p_longname 0
180# define p_linkname 0
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000181#endif
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000182
J. Tang77a2c512010-03-19 14:48:51 +0100183#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS || ENABLE_FEATURE_TAR_SELINUX
Denis Vlasenko666da5e2006-12-26 18:17:42 +0000184 again:
185#endif
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000186 /* Align header */
Glenn L McGrath237ae422002-11-03 14:05:15 +0000187 data_align(archive_handle, 512);
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000188
Denis Vlasenkob5963352006-11-26 01:46:59 +0000189 again_after_align:
190
Denis Vlasenko1f0b95f2009-03-13 14:26:44 +0000191#if ENABLE_DESKTOP || ENABLE_FEATURE_TAR_AUTODETECT
Denis Vlasenko0381d422008-07-10 23:06:00 +0000192 /* to prevent misdetection of bz2 sig */
Denys Vlasenko98a4c7c2010-02-04 15:00:15 +0100193 *(aliased_uint32_t*)&tar = 0;
Denis Vlasenko23ffb6a2008-02-13 17:52:42 +0000194 i = full_read(archive_handle->src_fd, &tar, 512);
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000195 /* If GNU tar sees EOF in above read, it says:
Denis Vlasenko23ffb6a2008-02-13 17:52:42 +0000196 * "tar: A lone zero block at N", where N = kilobyte
197 * where EOF was met (not EOF block, actual EOF!),
Denis Vlasenko0381d422008-07-10 23:06:00 +0000198 * and exits with EXIT_SUCCESS.
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +0000199 * We will mimic exit(EXIT_SUCCESS), although we will not mimic
Denis Vlasenko12c06222008-02-14 08:52:30 +0000200 * the message and we don't check whether we indeed
201 * saw zero block directly before this. */
Denis Vlasenko0381d422008-07-10 23:06:00 +0000202 if (i == 0) {
Denys Vlasenkoebfa9b52013-11-19 14:44:04 +0100203 bb_error_msg("short read");
204 /* this merely signals end of archive, not exit(1): */
205 return EXIT_FAILURE;
Denis Vlasenko0381d422008-07-10 23:06:00 +0000206 }
207 if (i != 512) {
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000208 IF_FEATURE_TAR_AUTODETECT(goto autodetect;)
Denys Vlasenkoebfa9b52013-11-19 14:44:04 +0100209 bb_error_msg_and_die("short read");
Denis Vlasenko0381d422008-07-10 23:06:00 +0000210 }
211
Denis Vlasenko12c06222008-02-14 08:52:30 +0000212#else
Denis Vlasenko0381d422008-07-10 23:06:00 +0000213 i = 512;
214 xread(archive_handle->src_fd, &tar, i);
Denis Vlasenko12c06222008-02-14 08:52:30 +0000215#endif
Denis Vlasenko0381d422008-07-10 23:06:00 +0000216 archive_handle->offset += i;
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000217
218 /* If there is no filename its an empty header */
Denis Vlasenko05efca92008-04-29 04:12:58 +0000219 if (tar.name[0] == 0 && tar.prefix[0] == 0) {
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100220 if (archive_handle->tar__end) {
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000221 /* Second consecutive empty header - end of archive.
Paul Fox94ff9f12005-07-20 19:24:13 +0000222 * Read until the end to empty the pipe from gz or bz2
223 */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000224 while (full_read(archive_handle->src_fd, &tar, 512) == 512)
Denis Vlasenko431a7c92008-02-19 11:26:28 +0000225 continue;
Denys Vlasenkoebfa9b52013-11-19 14:44:04 +0100226 return EXIT_FAILURE; /* "end of archive" */
Paul Fox94ff9f12005-07-20 19:24:13 +0000227 }
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100228 archive_handle->tar__end = 1;
Denys Vlasenkoebfa9b52013-11-19 14:44:04 +0100229 return EXIT_SUCCESS; /* "decoded one header" */
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000230 }
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100231 archive_handle->tar__end = 0;
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000232
Denis Vlasenko431a7c92008-02-19 11:26:28 +0000233 /* Check header has valid magic, "ustar" is for the proper tar,
234 * five NULs are for the old tar format */
235 if (strncmp(tar.magic, "ustar", 5) != 0
236 && (!ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
237 || memcmp(tar.magic, "\0\0\0\0", 5) != 0)
238 ) {
239#if ENABLE_FEATURE_TAR_AUTODETECT
Denis Vlasenko1f0b95f2009-03-13 14:26:44 +0000240 autodetect:
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000241 /* Two different causes for lseek() != 0:
242 * unseekable fd (would like to support that too, but...),
243 * or not first block (false positive, it's not .gz/.bz2!) */
Denis Vlasenko0381d422008-07-10 23:06:00 +0000244 if (lseek(archive_handle->src_fd, -i, SEEK_CUR) != 0)
Denis Vlasenko431a7c92008-02-19 11:26:28 +0000245 goto err;
Denys Vlasenko640ce3d2014-02-02 02:06:38 +0100246 if (setup_unzip_on_fd(archive_handle->src_fd, /*fail_if_not_compressed:*/ 0) != 0)
Denis Vlasenko431a7c92008-02-19 11:26:28 +0000247 err:
Denys Vlasenko8a6a2f92012-03-06 16:27:48 +0100248 bb_error_msg_and_die("invalid tar magic");
249 archive_handle->offset = 0;
250 goto again_after_align;
251#endif
Denis Vlasenko431a7c92008-02-19 11:26:28 +0000252 bb_error_msg_and_die("invalid tar magic");
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000253 }
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000254
255 /* Do checksum on headers.
256 * POSIX says that checksum is done on unsigned bytes, but
Denis Vlasenko940494f2007-03-04 18:09:50 +0000257 * Sun and HP-UX gets it wrong... more details in
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000258 * GNU tar source. */
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000259#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
260 sum_s = ' ' * sizeof(tar.chksum);
261#endif
262 sum_u = ' ' * sizeof(tar.chksum);
Denis Vlasenkob71c6682007-07-21 15:08:09 +0000263 for (i = 0; i < 148; i++) {
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000264 sum_u += ((unsigned char*)&tar)[i];
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000265#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000266 sum_s += ((signed char*)&tar)[i];
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000267#endif
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000268 }
Denis Vlasenkob71c6682007-07-21 15:08:09 +0000269 for (i = 156; i < 512; i++) {
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000270 sum_u += ((unsigned char*)&tar)[i];
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000271#if ENABLE_FEATURE_TAR_OLDSUN_COMPATIBILITY
Denis Vlasenkodcbd51d2007-03-03 20:06:59 +0000272 sum_s += ((signed char*)&tar)[i];
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000273#endif
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000274 }
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000275 /* This field does not need special treatment (getOctal) */
Denys Vlasenko8d338172009-09-23 17:16:37 +0200276 {
277 char *endp; /* gcc likes temp var for &endp */
278 sum = strtoul(tar.chksum, &endp, 8);
279 if ((*endp != '\0' && *endp != ' ')
280 || (sum_u != sum IF_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum))
281 ) {
282 bb_error_msg_and_die("invalid tar header checksum");
283 }
284 }
Denys Vlasenkod6459682010-01-03 23:41:11 +0100285 /* don't use xstrtoul, tar.chksum may have leading spaces */
286 sum = strtoul(tar.chksum, NULL, 8);
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000287 if (sum_u != sum IF_FEATURE_TAR_OLDSUN_COMPATIBILITY(&& sum_s != sum)) {
Denis Vlasenkoa80b4a02007-06-21 12:41:59 +0000288 bb_error_msg_and_die("invalid tar header checksum");
289 }
Glenn L McGrath95ebf612001-10-25 14:18:08 +0000290
Denis Vlasenkob5963352006-11-26 01:46:59 +0000291 /* 0 is reserved for high perf file, treat as normal file */
292 if (!tar.typeflag) tar.typeflag = '0';
293 parse_names = (tar.typeflag >= '0' && tar.typeflag <= '7');
Denis Vlasenkod6772502006-11-24 17:21:44 +0000294
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000295 /* getOctal trashes subsequent field, therefore we call it
296 * on fields in reverse order */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000297 if (tar.devmajor[0]) {
Denis Vlasenkod93400b2008-04-29 03:54:16 +0000298 char t = tar.prefix[0];
299 /* we trash prefix[0] here, but we DO need it later! */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000300 unsigned minor = GET_OCTAL(tar.devminor);
301 unsigned major = GET_OCTAL(tar.devmajor);
302 file_header->device = makedev(major, minor);
Denis Vlasenkod93400b2008-04-29 03:54:16 +0000303 tar.prefix[0] = t;
Denis Vlasenkocba9ef52006-10-10 21:00:47 +0000304 }
Denis Vlasenko75103842007-06-20 14:49:47 +0000305 file_header->link_target = NULL;
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000306 if (!p_linkname && parse_names && tar.linkname[0]) {
Denis Vlasenkobc1918a2008-04-15 01:17:50 +0000307 file_header->link_target = xstrndup(tar.linkname, sizeof(tar.linkname));
Denis Vlasenko75103842007-06-20 14:49:47 +0000308 /* FIXME: what if we have non-link object with link_target? */
309 /* Will link_target be free()ed? */
Denis Vlasenkod6772502006-11-24 17:21:44 +0000310 }
Denis Vlasenkoe00e5022008-02-14 20:37:54 +0000311#if ENABLE_FEATURE_TAR_UNAME_GNAME
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100312 file_header->tar__uname = tar.uname[0] ? xstrndup(tar.uname, sizeof(tar.uname)) : NULL;
313 file_header->tar__gname = tar.gname[0] ? xstrndup(tar.gname, sizeof(tar.gname)) : NULL;
Denis Vlasenkoe00e5022008-02-14 20:37:54 +0000314#endif
Denys Vlasenko7b48eb42010-05-06 20:08:14 +0200315 file_header->mtime = GET_OCTAL(tar.mtime);
316 file_header->size = GET_OCTAL(tar.size);
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000317 file_header->gid = GET_OCTAL(tar.gid);
318 file_header->uid = GET_OCTAL(tar.uid);
Glenn L McGrath916ba532004-02-20 02:34:42 +0000319 /* Set bits 0-11 of the files mode */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000320 file_header->mode = 07777 & GET_OCTAL(tar.mode);
Glenn L McGrath916ba532004-02-20 02:34:42 +0000321
Denis Vlasenkob5963352006-11-26 01:46:59 +0000322 file_header->name = NULL;
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000323 if (!p_longname && parse_names) {
Denis Vlasenkod6772502006-11-24 17:21:44 +0000324 /* we trash mode[0] here, it's ok */
Denis Vlasenkobc1918a2008-04-15 01:17:50 +0000325 //tar.name[sizeof(tar.name)] = '\0'; - gcc 4.3.0 would complain
326 tar.mode[0] = '\0';
Denis Vlasenko87cd4a82006-11-25 23:47:32 +0000327 if (tar.prefix[0]) {
328 /* and padding[0] */
Denis Vlasenkobc1918a2008-04-15 01:17:50 +0000329 //tar.prefix[sizeof(tar.prefix)] = '\0'; - gcc 4.3.0 would complain
330 tar.padding[0] = '\0';
Denis Vlasenkocf30cc82006-11-24 14:53:18 +0000331 file_header->name = concat_path_file(tar.prefix, tar.name);
Denis Vlasenko87cd4a82006-11-25 23:47:32 +0000332 } else
Denis Vlasenkocf30cc82006-11-24 14:53:18 +0000333 file_header->name = xstrdup(tar.name);
334 }
335
Glenn L McGrath916ba532004-02-20 02:34:42 +0000336 /* Set bits 12-15 of the files mode */
Denis Vlasenkod6772502006-11-24 17:21:44 +0000337 /* (typeflag was not trashed because chksum does not use getOctal) */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000338 switch (tar.typeflag) {
Ian Wienand954dbd32011-07-29 08:33:47 +0200339 case '1': /* hardlink */
340 /* we mark hardlinks as regular files with zero size and a link name */
Glenn L McGrath916ba532004-02-20 02:34:42 +0000341 file_header->mode |= S_IFREG;
Ian Wienand954dbd32011-07-29 08:33:47 +0200342 /* on size of link fields from star(4)
343 * ... For tar archives written by pre POSIX.1-1988
344 * implementations, the size field usually contains the size of
345 * the file and needs to be ignored as no data may follow this
346 * header type. For POSIX.1- 1988 compliant archives, the size
347 * field needs to be 0. For POSIX.1-2001 compliant archives,
348 * the size field may be non zero, indicating that file data is
349 * included in the archive.
350 * i.e; always assume this is zero for safety.
351 */
352 goto size0;
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +0000353 case '7':
Denis Vlasenkob5963352006-11-26 01:46:59 +0000354 /* case 0: */
Glenn L McGrath21110a02003-01-28 01:45:48 +0000355 case '0':
Denis Vlasenkod6772502006-11-24 17:21:44 +0000356#if ENABLE_FEATURE_TAR_OLDGNU_COMPATIBILITY
Glenn L McGrath87af49f2003-09-09 17:41:03 +0000357 if (last_char_is(file_header->name, '/')) {
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000358 goto set_dir;
359 }
Glenn L McGrathc9f1fce2004-02-20 02:25:18 +0000360#endif
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000361 file_header->mode |= S_IFREG;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000362 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000363 case '2':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000364 file_header->mode |= S_IFLNK;
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000365 /* have seen tarballs with size field containing
366 * the size of the link target's name */
367 size0:
368 file_header->size = 0;
Glenn L McGrath99b12542002-08-22 17:47:09 +0000369 break;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000370 case '3':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000371 file_header->mode |= S_IFCHR;
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000372 goto size0; /* paranoia */
Glenn L McGrath21110a02003-01-28 01:45:48 +0000373 case '4':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000374 file_header->mode |= S_IFBLK;
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000375 goto size0;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000376 case '5':
Denis Vlasenko5e34ff22009-04-21 11:09:40 +0000377 IF_FEATURE_TAR_OLDGNU_COMPATIBILITY(set_dir:)
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000378 file_header->mode |= S_IFDIR;
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000379 goto size0;
Glenn L McGrath21110a02003-01-28 01:45:48 +0000380 case '6':
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000381 file_header->mode |= S_IFIFO;
Denis Vlasenkoadc772a2008-07-20 17:10:43 +0000382 goto size0;
Denis Vlasenkod6772502006-11-24 17:21:44 +0000383#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000384 case 'L':
Denis Vlasenkob5963352006-11-26 01:46:59 +0000385 /* free: paranoia: tar with several consecutive longnames */
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000386 free(p_longname);
Denis Vlasenkob5963352006-11-26 01:46:59 +0000387 /* For paranoia reasons we allocate extra NUL char */
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000388 p_longname = xzalloc(file_header->size + 1);
Denis Vlasenkob5963352006-11-26 01:46:59 +0000389 /* We read ASCIZ string, including NUL */
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000390 xread(archive_handle->src_fd, p_longname, file_header->size);
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000391 archive_handle->offset += file_header->size;
Denis Vlasenkob5963352006-11-26 01:46:59 +0000392 /* return get_header_tar(archive_handle); */
393 /* gcc 4.1.1 didn't optimize it into jump */
394 /* so we will do it ourself, this also saves stack */
395 goto again;
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000396 case 'K':
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000397 free(p_linkname);
398 p_linkname = xzalloc(file_header->size + 1);
399 xread(archive_handle->src_fd, p_linkname, file_header->size);
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000400 archive_handle->offset += file_header->size;
Denis Vlasenkob5963352006-11-26 01:46:59 +0000401 /* return get_header_tar(archive_handle); */
402 goto again;
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000403 case 'D': /* GNU dump dir */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000404 case 'M': /* Continuation of multi volume archive */
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000405 case 'N': /* Old GNU for names > 100 characters */
406 case 'S': /* Sparse file */
407 case 'V': /* Volume header */
Glenn L McGrath6aa52232004-02-17 11:55:06 +0000408#endif
Rob Landleyff6e21c2006-07-06 20:30:19 +0000409 case 'g': /* pax global header */
Denys Vlasenko6111f962012-02-23 13:45:18 +0100410 case 'x': { /* pax extended header */
411 if ((uoff_t)file_header->size > 0xfffff) /* paranoia */
412 goto skip_ext_hdr;
413 process_pax_hdr(archive_handle, file_header->size, (tar.typeflag == 'g'));
414 goto again_after_align;
415 }
J. Tang77a2c512010-03-19 14:48:51 +0100416 skip_ext_hdr:
J. Tang77a2c512010-03-19 14:48:51 +0100417 {
Denis Vlasenkob5963352006-11-26 01:46:59 +0000418 off_t sz;
419 bb_error_msg("warning: skipping header '%c'", tar.typeflag);
420 sz = (file_header->size + 511) & ~(off_t)511;
421 archive_handle->offset += sz;
422 sz >>= 9; /* sz /= 512 but w/o contortions for signed div */
423 while (sz--)
424 xread(archive_handle->src_fd, &tar, 512);
425 /* return get_header_tar(archive_handle); */
426 goto again_after_align;
427 }
Glenn L McGrathb0e163a2004-02-19 08:48:30 +0000428 default:
Denis Vlasenkob5963352006-11-26 01:46:59 +0000429 bb_error_msg_and_die("unknown typeflag: 0x%x", tar.typeflag);
Glenn L McGrath6aa52232004-02-17 11:55:06 +0000430 }
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000431
Denis Vlasenkod6772502006-11-24 17:21:44 +0000432#if ENABLE_FEATURE_TAR_GNU_EXTENSIONS
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000433 if (p_longname) {
434 file_header->name = p_longname;
435 p_longname = NULL;
Denis Vlasenkod6772502006-11-24 17:21:44 +0000436 }
Denis Vlasenkoa60936d2008-06-28 05:04:09 +0000437 if (p_linkname) {
438 file_header->link_target = p_linkname;
439 p_linkname = NULL;
Denis Vlasenkod6772502006-11-24 17:21:44 +0000440 }
441#endif
Denys Vlasenko5e29e262011-03-01 17:21:07 +0100442
443 /* Everything up to and including last ".." component is stripped */
Denys Vlasenkob80acf52011-03-02 01:21:02 +0100444 overlapping_strcpy(file_header->name, strip_unsafe_prefix(file_header->name));
Denis Vlasenkod6772502006-11-24 17:21:44 +0000445
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000446 /* Strip trailing '/' in directories */
Denis Vlasenko714701c2006-12-22 00:21:07 +0000447 /* Must be done after mode is set as '/' is used to check if it's a directory */
Denis Vlasenko376ce1e2006-11-24 14:51:01 +0000448 cp = last_char_is(file_header->name, '/');
Glenn L McGrath3d5828f2003-08-14 02:55:15 +0000449
Glenn L McGrath8e940982002-11-04 23:47:31 +0000450 if (archive_handle->filter(archive_handle) == EXIT_SUCCESS) {
Denis Vlasenko0381d422008-07-10 23:06:00 +0000451 archive_handle->action_header(/*archive_handle->*/ file_header);
Denis Vlasenkocf30cc82006-11-24 14:53:18 +0000452 /* Note that we kill the '/' only after action_header() */
453 /* (like GNU tar 1.15.1: verbose mode outputs "dir/dir/") */
Denys Vlasenko02365a62010-04-09 10:52:52 +0200454 if (cp)
455 *cp = '\0';
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000456 archive_handle->action_data(archive_handle);
Denys Vlasenko440a5092012-06-22 16:27:21 +0200457 if (archive_handle->accept || archive_handle->reject
458 || (archive_handle->ah_flags & ARCHIVE_REMEMBER_NAMES)
459 ) {
Denys Vlasenkob768aeb2010-06-26 18:22:41 +0200460 llist_add_to(&archive_handle->passed, file_header->name);
Denys Vlasenko440a5092012-06-22 16:27:21 +0200461 } else /* Caller isn't interested in list of unpacked files */
Denys Vlasenkob768aeb2010-06-26 18:22:41 +0200462 free(file_header->name);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000463 } else {
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000464 data_skip(archive_handle);
Denis Vlasenkob5963352006-11-26 01:46:59 +0000465 free(file_header->name);
Glenn L McGrath7ca04f32002-09-25 02:47:48 +0000466 }
467 archive_handle->offset += file_header->size;
468
Denis Vlasenko75103842007-06-20 14:49:47 +0000469 free(file_header->link_target);
Denys Vlasenkob768aeb2010-06-26 18:22:41 +0200470 /* Do not free(file_header->name)!
471 * It might be inserted in archive_handle->passed - see above */
Denis Vlasenkoe00e5022008-02-14 20:37:54 +0000472#if ENABLE_FEATURE_TAR_UNAME_GNAME
Denys Vlasenkoaa4977d2010-01-06 10:53:17 +0100473 free(file_header->tar__uname);
474 free(file_header->tar__gname);
Denis Vlasenkoe00e5022008-02-14 20:37:54 +0000475#endif
Denys Vlasenkoebfa9b52013-11-19 14:44:04 +0100476 return EXIT_SUCCESS; /* "decoded one header" */
Eric Andersen2276d832002-07-11 11:11:56 +0000477}