1 /* tar.c - create/extract archives
2 *
3 * Copyright 2014 Ashwini Kumar <ak.ashwini81@gmail.com>
4 *
5 * USTAR interchange format is of interest in
6 * See http://http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html
7 * For writing to external program
8 * http://www.gnu.org/software/tar/manual/html_node/Writing-to-an-External-Program.html
9
10 USE_TAR(NEWTOY(tar, "&(no-recursion)(numeric-owner)(no-same-permissions)(overwrite)(exclude)*(to-command):o(no-same-owner)p(same-permissions)k(keep-old)c(create)|h(dereference)x(extract)|t(list)|v(verbose)z(gzip)O(to-stdout)m(touch)X(exclude-from)*T(files-from)*C(directory):f(file):[!txc]", TOYFLAG_USR|TOYFLAG_BIN))
11
12 config TAR
13 bool "tar"
14 default n
15 help
16 usage: tar -[cxtzhmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR]
17
18 Create, extract, or list files from a tar file
19
20 Operation:
21 c Create
22 f Name of TARFILE ('-' for stdin/out)
23 h Follow symlinks
24 m Don't restore mtime
25 t List
26 v Verbose
27 x Extract
28 z (De)compress using gzip
29 C Change to DIR before operation
30 O Extract to stdout
31 exclude=FILE File to exclude
32 X File with names to exclude
33 T File with names to include
34 */
35
36 #define FOR_tar
37 #include "toys.h"
38
39 GLOBALS(
40 char *fname;
41 char *dir;
42 struct arg_list *inc_file;
43 struct arg_list *exc_file;
44 char *tocmd;
45 struct arg_list *exc;
46
47 struct arg_list *inc, *pass;
48 void *inodes, *handle;
49 )
50
51 struct tar_hdr {
52 char name[100], mode[8], uid[8], gid[8],size[12], mtime[12], chksum[8],
53 type, link[100], magic[8], uname[32], gname[32], major[8], minor[8],
54 prefix[155], padd[12];
55 };
56
57 struct file_header {
58 char *name, *link_target, *uname, *gname;
59 off_t size;
60 uid_t uid;
61 gid_t gid;
62 mode_t mode;
63 time_t mtime;
64 dev_t device;
65 };
66
67 struct archive_handler {
68 int src_fd;
69 struct file_header file_hdr;
70 off_t offset;
71 void (*extract_handler)(struct archive_handler*);
72 };
73
74 struct inode_list {
75 struct inode_list *next;
76 char *arg;
77 ino_t ino;
78 dev_t dev;
79 };
80
copy_in_out(int src,int dst,off_t size)81 static void copy_in_out(int src, int dst, off_t size)
82 {
83 int i, rd, rem = size%512, cnt;
84
85 cnt = size/512 + (rem?1:0);
86
87 for (i = 0; i < cnt; i++) {
88 rd = (i == cnt-1 && rem) ? rem : 512;
89 xreadall(src, toybuf, rd);
90 writeall(dst, toybuf, rd);
91 }
92 }
93
94 //convert to octal
itoo(char * str,int len,off_t val)95 static void itoo(char *str, int len, off_t val)
96 {
97 char *t, tmp[sizeof(off_t)*3+1];
98 int cnt = sprintf(tmp, "%0*llo", len, (unsigned long long)val);
99
100 t = tmp + cnt - len;
101 if (*t == '0') t++;
102 memcpy(str, t, len);
103 }
104
seen_inode(void ** list,struct stat * st,char * name)105 static struct inode_list *seen_inode(void **list, struct stat *st, char *name)
106 {
107 if (!st) llist_traverse(*list, llist_free_arg);
108 else if (!S_ISDIR(st->st_mode) && st->st_nlink > 1) {
109 struct inode_list *new;
110
111 for (new = *list; new; new = new->next)
112 if(new->ino == st->st_ino && new->dev == st->st_dev)
113 return new;
114
115 new = xzalloc(sizeof(*new));
116 new->ino = st->st_ino;
117 new->dev = st->st_dev;
118 new->arg = xstrdup(name);
119 new->next = *list;
120 *list = new;
121 }
122 return 0;
123 }
124
write_longname(struct archive_handler * tar,char * name,char type)125 static void write_longname(struct archive_handler *tar, char *name, char type)
126 {
127 struct tar_hdr tmp;
128 unsigned int sum = 0;
129 int i, sz = strlen(name) +1;
130 char buf[512] = {0,};
131
132 memset(&tmp, 0, sizeof(tmp));
133 strcpy(tmp.name, "././@LongLink");
134 sprintf(tmp.mode, "%0*d", (int)sizeof(tmp.mode)-1, 0);
135 sprintf(tmp.uid, "%0*d", (int)sizeof(tmp.uid)-1, 0);
136 sprintf(tmp.gid, "%0*d", (int)sizeof(tmp.gid)-1, 0);
137 sprintf(tmp.size, "%0*d", (int)sizeof(tmp.size)-1, 0);
138 sprintf(tmp.mtime, "%0*d", (int)sizeof(tmp.mtime)-1, 0);
139 itoo(tmp.size, sizeof(tmp.size), sz);
140 tmp.type = type;
141 memset(tmp.chksum, ' ', 8);
142 strcpy(tmp.magic, "ustar ");
143 for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&tmp)[i];
144 itoo(tmp.chksum, sizeof(tmp.chksum)-1, sum);
145
146 writeall(tar->src_fd, (void*) &tmp, sizeof(tmp));
147 //write name to archive
148 writeall(tar->src_fd, name, sz);
149 if (sz%512) writeall(tar->src_fd, buf, (512-(sz%512)));
150 }
151
filter(struct arg_list * lst,char * name)152 static int filter(struct arg_list *lst, char *name)
153 {
154 struct arg_list *cur;
155
156 for (cur = lst; cur; cur = cur->next)
157 if (!fnmatch(cur->arg, name, 1<<3)) return 1;
158 return 0;
159 }
160
add_file(struct archive_handler * tar,char ** nam,struct stat * st)161 static void add_file(struct archive_handler *tar, char **nam, struct stat *st)
162 {
163 struct tar_hdr hdr;
164 struct passwd *pw;
165 struct group *gr;
166 struct inode_list *node;
167 int i, fd =-1;
168 char *c, *p, *name = *nam, *lnk, *hname, buf[512] = {0,};
169 unsigned int sum = 0;
170 static int warn = 1;
171
172 for (p = name; *p; p++)
173 if ((p == name || p[-1] == '/') && *p != '/'
174 && filter(TT.exc, p)) return;
175
176 if (S_ISDIR(st->st_mode) && name[strlen(name)-1] != '/') {
177 lnk = xmprintf("%s/",name);
178 free(name);
179 *nam = name = lnk;
180 }
181 hname = name;
182 //remove leading '/' or relative path '../' component
183 if (*hname == '/') hname++;
184 if (!*hname) return;
185 while ((c = strstr(hname, "../"))) hname = c + 3;
186 if (warn && hname != name) {
187 printf("removing leading '%.*s' "
188 "from member names\n", (int)(hname-name), name);
189 warn = 0;
190 }
191
192 memset(&hdr, 0, sizeof(hdr));
193 strncpy(hdr.name, hname, sizeof(hdr.name));
194 itoo(hdr.mode, sizeof(hdr.mode), st->st_mode &07777);
195 itoo(hdr.uid, sizeof(hdr.uid), st->st_uid);
196 itoo(hdr.gid, sizeof(hdr.gid), st->st_gid);
197 itoo(hdr.size, sizeof(hdr.size), 0); //set size later
198 itoo(hdr.mtime, sizeof(hdr.mtime), st->st_mtime);
199 for (i=0; i<sizeof(hdr.chksum); i++) hdr.chksum[i] = ' ';
200
201 if ((node = seen_inode(&TT.inodes, st, hname))) {
202 //this is a hard link
203 hdr.type = '1';
204 if (strlen(node->arg) > sizeof(hdr.link))
205 write_longname(tar, hname, 'K'); //write longname LINK
206 xstrncpy(hdr.link, node->arg, sizeof(hdr.link));
207 } else if (S_ISREG(st->st_mode)) {
208 hdr.type = '0';
209 if (st->st_size <= (off_t)0777777777777LL)
210 itoo(hdr.size, sizeof(hdr.size), st->st_size);
211 else {
212 error_msg("can't store file '%s' of size '%lld'\n",
213 hname, (unsigned long long)st->st_size);
214 return;
215 }
216 } else if (S_ISLNK(st->st_mode)) {
217 hdr.type = '2'; //'K' long link
218 if (!(lnk = xreadlink(name))) {
219 perror_msg("readlink");
220 return;
221 }
222 if (strlen(lnk) > sizeof(hdr.link))
223 write_longname(tar, hname, 'K'); //write longname LINK
224 xstrncpy(hdr.link, lnk, sizeof(hdr.link));
225 free(lnk);
226 }
227 else if (S_ISDIR(st->st_mode)) hdr.type = '5';
228 else if (S_ISFIFO(st->st_mode)) hdr.type = '6';
229 else if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
230 hdr.type = (S_ISCHR(st->st_mode))?'3':'4';
231 itoo(hdr.major, sizeof(hdr.major), major(st->st_rdev));
232 itoo(hdr.minor, sizeof(hdr.minor), minor(st->st_rdev));
233 } else {
234 error_msg("unknown file type '%o'", st->st_mode & S_IFMT);
235 return;
236 }
237 if (strlen(hname) > sizeof(hdr.name))
238 write_longname(tar, hname, 'L'); //write longname NAME
239 strcpy(hdr.magic, "ustar ");
240 if ((pw = getpwuid(st->st_uid)))
241 snprintf(hdr.uname, sizeof(hdr.uname), "%s", pw->pw_name);
242 else snprintf(hdr.uname, sizeof(hdr.uname), "%d", st->st_uid);
243
244 if ((gr = getgrgid(st->st_gid)))
245 snprintf(hdr.gname, sizeof(hdr.gname), "%s", gr->gr_name);
246 else snprintf(hdr.gname, sizeof(hdr.gname), "%d", st->st_gid);
247
248 //calculate chksum.
249 for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&hdr)[i];
250 itoo(hdr.chksum, sizeof(hdr.chksum)-1, sum);
251 if (toys.optflags & FLAG_v) printf("%s\n",hname);
252 writeall(tar->src_fd, (void*)&hdr, 512);
253
254 //write actual data to archive
255 if (hdr.type != '0') return; //nothing to write
256 if ((fd = open(name, O_RDONLY)) < 0) {
257 perror_msg("can't open '%s'", name);
258 return;
259 }
260 copy_in_out(fd, tar->src_fd, st->st_size);
261 if (st->st_size%512) writeall(tar->src_fd, buf, (512-(st->st_size%512)));
262 close(fd);
263 }
264
add_to_tar(struct dirtree * node)265 static int add_to_tar(struct dirtree *node)
266 {
267 struct stat st;
268 char *path;
269 struct archive_handler *hdl = (struct archive_handler*)TT.handle;
270
271 if (!fstat(hdl->src_fd, &st) && st.st_dev == node->st.st_dev
272 && st.st_ino == node->st.st_ino) {
273 error_msg("'%s' file is the archive; not dumped", TT.fname);
274 return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
275 }
276
277 if (node->parent && !dirtree_notdotdot(node)) return 0;
278 path = dirtree_path(node, 0);
279 add_file(hdl, &path, &(node->st)); //path may be modified
280 free(path);
281 if (toys.optflags & FLAG_no_recursion) return 0;
282 return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
283 }
284
compress_stream(struct archive_handler * tar_hdl)285 static void compress_stream(struct archive_handler *tar_hdl)
286 {
287 int pipefd[2];
288 pid_t cpid;
289
290 xpipe(pipefd);
291
292 signal(SIGPIPE, SIG_IGN);
293 cpid = fork();
294 if (cpid == -1) perror_exit("fork");
295
296 if (!cpid) { /* Child reads from pipe */
297 char *argv[] = {"gzip", "-f", NULL};
298 xclose(pipefd[1]); /* Close unused write*/
299 dup2(pipefd[0], 0);
300 dup2(tar_hdl->src_fd, 1); //write to tar fd
301 xexec(argv);
302 } else {
303 xclose(pipefd[0]); /* Close unused read end */
304 dup2(pipefd[1], tar_hdl->src_fd); //write to pipe
305 }
306 }
307
extract_to_stdout(struct archive_handler * tar)308 static void extract_to_stdout(struct archive_handler *tar)
309 {
310 struct file_header *file_hdr = &tar->file_hdr;
311
312 copy_in_out(tar->src_fd, 0, file_hdr->size);
313 tar->offset += file_hdr->size;
314 }
315
extract_to_command(struct archive_handler * tar)316 static void extract_to_command(struct archive_handler *tar)
317 {
318 int pipefd[2], status = 0;
319 pid_t cpid;
320 struct file_header *file_hdr = &tar->file_hdr;
321
322 if (pipe(pipefd) == -1) error_exit("pipe");
323 if (!S_ISREG(file_hdr->mode)) return; //only regular files are supported.
324
325 cpid = fork();
326 if (cpid == -1) perror_exit("fork");
327
328 if (!cpid) { // Child reads from pipe
329 char buf[64], *argv[4] = {"sh", "-c", TT.tocmd, NULL};
330
331 setenv("TAR_FILETYPE", "f", 1);
332 sprintf(buf, "%0o", file_hdr->mode);
333 setenv("TAR_MODE", buf, 1);
334 sprintf(buf, "%ld", (long)file_hdr->size);
335 setenv("TAR_SIZE", buf, 1);
336 setenv("TAR_FILENAME", file_hdr->name, 1);
337 setenv("TAR_UNAME", file_hdr->uname, 1);
338 setenv("TAR_GNAME", file_hdr->gname, 1);
339 sprintf(buf, "%0o", (int)file_hdr->mtime);
340 setenv("TAR_MTIME", buf, 1);
341 sprintf(buf, "%0o", file_hdr->uid);
342 setenv("TAR_UID", buf, 1);
343 sprintf(buf, "%0o", file_hdr->gid);
344 setenv("TAR_GID", buf, 1);
345
346 xclose(pipefd[1]); // Close unused write
347 dup2(pipefd[0], 0);
348 signal(SIGPIPE, SIG_DFL);
349 xexec(argv);
350 } else {
351 xclose(pipefd[0]); // Close unused read end
352 copy_in_out(tar->src_fd, pipefd[1], file_hdr->size);
353 tar->offset += file_hdr->size;
354 xclose(pipefd[1]);
355 waitpid(cpid, &status, 0);
356 if (WIFSIGNALED(status))
357 xprintf("tar : %d: child returned %d\n", cpid, WTERMSIG(status));
358 }
359 }
360
extract_to_disk(struct archive_handler * tar)361 static void extract_to_disk(struct archive_handler *tar)
362 {
363 int flags, dst_fd = -1;
364 char *s;
365 struct stat ex;
366 struct file_header *file_hdr = &tar->file_hdr;
367
368 if (file_hdr->name[strlen(file_hdr->name)-1] == '/')
369 file_hdr->name[strlen(file_hdr->name)-1] = 0;
370 //Regular file with preceding path
371 if ((s = strrchr(file_hdr->name, '/'))) {
372 if (mkpathat(AT_FDCWD, file_hdr->name, 00, 2) && errno !=EEXIST) {
373 error_msg(":%s: not created", file_hdr->name);
374 return;
375 }
376 }
377
378 //remove old file, if exists
379 if (!(toys.optflags & FLAG_k) && !S_ISDIR(file_hdr->mode)
380 && !lstat( file_hdr->name, &ex)) {
381 if (unlink(file_hdr->name)) {
382 perror_msg("can't remove: %s",file_hdr->name);
383 }
384 }
385
386 //hard link
387 if (S_ISREG(file_hdr->mode) && file_hdr->link_target) {
388 if (link(file_hdr->link_target, file_hdr->name))
389 perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
390 goto COPY;
391 }
392
393 switch (file_hdr->mode & S_IFMT) {
394 case S_IFREG:
395 flags = O_WRONLY|O_CREAT|O_EXCL;
396 if (toys.optflags & FLAG_overwrite) flags = O_WRONLY|O_CREAT|O_TRUNC;
397 dst_fd = open(file_hdr->name, flags, file_hdr->mode & 07777);
398 if (dst_fd == -1) perror_msg("%s: can't open", file_hdr->name);
399 break;
400 case S_IFDIR:
401 if ((mkdir(file_hdr->name, file_hdr->mode) == -1) && errno != EEXIST)
402 perror_msg("%s: can't create", file_hdr->name);
403 break;
404 case S_IFLNK:
405 if (symlink(file_hdr->link_target, file_hdr->name))
406 perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
407 break;
408 case S_IFBLK:
409 case S_IFCHR:
410 case S_IFIFO:
411 if (mknod(file_hdr->name, file_hdr->mode, file_hdr->device))
412 perror_msg("can't create '%s'", file_hdr->name);
413 break;
414 default:
415 printf("type not yet supported\n");
416 break;
417 }
418
419 //copy file....
420 COPY:
421 copy_in_out(tar->src_fd, dst_fd, file_hdr->size);
422 tar->offset += file_hdr->size;
423 close(dst_fd);
424
425 if (S_ISLNK(file_hdr->mode)) return;
426 if (!(toys.optflags & FLAG_o)) {
427 //set ownership..., --no-same-owner, --numeric-owner
428 uid_t u = file_hdr->uid;
429 gid_t g = file_hdr->gid;
430
431 if (!(toys.optflags & FLAG_numeric_owner)) {
432 struct group *gr = getgrnam(file_hdr->gname);
433 struct passwd *pw = getpwnam(file_hdr->uname);
434 if (pw) u = pw->pw_uid;
435 if (gr) g = gr->gr_gid;
436 }
437 if (chown(file_hdr->name, u, g))
438 perror_msg("chown %d:%d '%s'", u, g, file_hdr->name);;
439 }
440
441 if (toys.optflags & FLAG_p) // || !(toys.optflags & FLAG_no_same_permissions))
442 chmod(file_hdr->name, file_hdr->mode);
443
444 //apply mtime
445 if (!(toys.optflags & FLAG_m)) {
446 struct timeval times[2] = {{file_hdr->mtime, 0},{file_hdr->mtime, 0}};
447 utimes(file_hdr->name, times);
448 }
449 }
450
add_to_list(struct arg_list ** llist,char * name)451 static void add_to_list(struct arg_list **llist, char *name)
452 {
453 struct arg_list **list = llist;
454
455 while (*list) list=&((*list)->next);
456 *list = xzalloc(sizeof(struct arg_list));
457 (*list)->arg = name;
458 if ((name[strlen(name)-1] == '/') && strlen(name) != 1)
459 name[strlen(name)-1] = '\0';
460 }
461
add_from_file(struct arg_list ** llist,struct arg_list * flist)462 static void add_from_file(struct arg_list **llist, struct arg_list *flist)
463 {
464 char *line = NULL;
465
466 while (flist) {
467 int fd = 0;
468
469 if (strcmp((char *)flist->arg, "-"))
470 fd = xopen((char *)flist->arg, O_RDONLY);
471
472 while ((line = get_line(fd))) {
473 add_to_list(llist, line);
474 }
475 if (fd) close(fd);
476 flist = flist->next;
477 }
478 }
479
init_handler()480 static struct archive_handler *init_handler()
481 {
482 struct archive_handler *tar_hdl = xzalloc(sizeof(struct archive_handler));
483 tar_hdl->extract_handler = extract_to_disk;
484 return tar_hdl;
485 }
486
487 //convert octal to int
otoi(char * str,int len)488 static int otoi(char *str, int len)
489 {
490 long val;
491 char *endp, inp[len+1]; //1 for NUL termination
492
493 memcpy(inp, str, len);
494 inp[len] = '\0'; //nul-termination made sure
495 val = strtol(inp, &endp, 8);
496 if (*endp && *endp != ' ') error_exit("invalid param");
497 return (int)val;
498 }
499
extract_stream(struct archive_handler * tar_hdl)500 static void extract_stream(struct archive_handler *tar_hdl)
501 {
502 int pipefd[2];
503 pid_t cpid;
504
505 if (pipe(pipefd) == -1) error_exit("pipe");
506
507 cpid = fork();
508 if (cpid == -1) perror_exit("fork");
509
510 if (!cpid) { /* Child reads from pipe */
511 char *argv[] = {"gunzip", "-cf", "-", NULL};
512 xclose(pipefd[0]); /* Close unused read*/
513 dup2(tar_hdl->src_fd, 0);
514 dup2(pipefd[1], 1); //write to pipe
515 xexec(argv);
516 } else {
517 xclose(pipefd[1]); /* Close unused read end */
518 dup2(pipefd[0], tar_hdl->src_fd); //read from pipe
519 }
520 }
521
process_extended_hdr(struct archive_handler * tar,int size)522 static char *process_extended_hdr(struct archive_handler *tar, int size)
523 {
524 char *value = NULL, *p, *buf = xzalloc(size+1);
525
526 if (readall(tar->src_fd, buf, size) != size) error_exit("short read");
527 buf[size] = 0;
528 tar->offset += size;
529 p = buf;
530
531 while (size) {
532 char *key;
533 int len, n;
534
535 // extended records are of the format: "LEN NAME=VALUE\n"
536 sscanf(p, "%d %n", &len, &n);
537 key = p + n;
538 p += len;
539 size -= len;
540 p[-1] = 0;
541 if (size < 0) {
542 error_msg("corrupted extended header");
543 break;
544 }
545
546 len = strlen("path=");
547 if (!strncmp(key, "path=", len)) {
548 value = key + strlen("path=");
549 break;
550 }
551 }
552 if (value) value = xstrdup(value);
553 free(buf);
554 return value;
555 }
556
tar_skip(struct archive_handler * tar,int sz)557 static void tar_skip(struct archive_handler *tar, int sz)
558 {
559 int x;
560
561 while ((x = lskip(tar->src_fd, sz))) {
562 tar->offset += sz - x;
563 sz = x;
564 }
565 tar->offset += sz;
566 }
567
unpack_tar(struct archive_handler * tar_hdl)568 static void unpack_tar(struct archive_handler *tar_hdl)
569 {
570 struct tar_hdr tar;
571 struct file_header *file_hdr;
572 int i, j, maj, min, sz, e = 0;
573 unsigned int cksum;
574 unsigned char *gzMagic;
575 char *longname = NULL, *longlink = NULL;
576
577 while (1) {
578 cksum = 0;
579 if (tar_hdl->offset % 512) {
580 sz = 512 - tar_hdl->offset % 512;
581 tar_skip(tar_hdl, sz);
582 }
583 i = readall(tar_hdl->src_fd, &tar, 512);
584 tar_hdl->offset += i;
585 if (i != 512) {
586 if (i >= 2) goto CHECK_MAGIC; //may be a small (<512 byte)zipped file
587 error_exit("read error");
588 }
589
590 if (!tar.name[0]) {
591 if (e) return; //end of tar 2 empty blocks
592 e = 1;//empty jump to next block
593 continue;
594 }
595 if (strncmp(tar.magic, "ustar", 5)) {
596 //try detecting by reading magic
597 CHECK_MAGIC:
598 gzMagic = (unsigned char*)&tar;
599 if ((gzMagic[0] == 0x1f) && (gzMagic[1] == 0x8b)
600 && !lseek(tar_hdl->src_fd, -i, SEEK_CUR)) {
601 tar_hdl->offset -= i;
602 extract_stream(tar_hdl);
603 continue;
604 }
605 error_exit("invalid tar format");
606 }
607
608 for (j = 0; j<148; j++) cksum += (unsigned int)((char*)&tar)[j];
609 for (j = 156; j<500; j++) cksum += (unsigned int)((char*)&tar)[j];
610 //cksum field itself treated as ' '
611 for ( j= 0; j<8; j++) cksum += (unsigned int)' ';
612
613 if (cksum != otoi(tar.chksum, sizeof(tar.chksum))) error_exit("wrong cksum");
614
615 file_hdr = &tar_hdl->file_hdr;
616 memset(file_hdr, 0, sizeof(struct file_header));
617 file_hdr->mode = otoi(tar.mode, sizeof(tar.mode));
618 file_hdr->uid = otoi(tar.uid, sizeof(tar.uid));
619 file_hdr->gid = otoi(tar.gid, sizeof(tar.gid));
620 file_hdr->size = otoi(tar.size, sizeof(tar.size));
621 file_hdr->mtime = otoi(tar.mtime, sizeof(tar.mtime));
622 file_hdr->uname = xstrdup(tar.uname);
623 file_hdr->gname = xstrdup(tar.gname);
624 maj = otoi(tar.major, sizeof(tar.major));
625 min = otoi(tar.minor, sizeof(tar.minor));
626 file_hdr->device = makedev(maj, min);
627
628 if (tar.type <= '7') {
629 if (tar.link[0]) {
630 sz = sizeof(tar.link);
631 file_hdr->link_target = xmalloc(sz + 1);
632 memcpy(file_hdr->link_target, tar.link, sz);
633 file_hdr->link_target[sz] = '\0';
634 }
635
636 file_hdr->name = xzalloc(256);// pathname supported size
637 if (tar.prefix[0]) {
638 memcpy(file_hdr->name, tar.prefix, sizeof(tar.prefix));
639 sz = strlen(file_hdr->name);
640 if (file_hdr->name[sz-1] != '/') file_hdr->name[sz] = '/';
641 }
642 sz = strlen(file_hdr->name);
643 memcpy(file_hdr->name + sz, tar.name, sizeof(tar.name));
644 if (file_hdr->name[255]) error_exit("filename too long");
645 }
646
647 switch (tar.type) {
648 // case '\0':
649 case '0':
650 case '7':
651 case '1': //Hard Link
652 file_hdr->mode |= S_IFREG;
653 break;
654 case '2':
655 file_hdr->mode |= S_IFLNK;
656 break;
657 case '3':
658 file_hdr->mode |= S_IFCHR;
659 break;
660 case '4':
661 file_hdr->mode |= S_IFBLK;
662 break;
663 case '5':
664 file_hdr->mode |= S_IFDIR;
665 break;
666 case '6':
667 file_hdr->mode |= S_IFIFO;
668 break;
669 case 'K':
670 longlink = xzalloc(file_hdr->size +1);
671 xread(tar_hdl->src_fd, longlink, file_hdr->size);
672 tar_hdl->offset += file_hdr->size;
673 continue;
674 case 'L':
675 free(longname);
676 longname = xzalloc(file_hdr->size +1);
677 xread(tar_hdl->src_fd, longname, file_hdr->size);
678 tar_hdl->offset += file_hdr->size;
679 continue;
680 case 'D':
681 case 'M':
682 case 'N':
683 case 'S':
684 case 'V':
685 case 'g': // pax global header
686 tar_skip(tar_hdl, file_hdr->size);
687 continue;
688 case 'x': // pax extended header
689 free(longname);
690 longname = process_extended_hdr(tar_hdl, file_hdr->size);
691 continue;
692 default: break;
693 }
694
695 if (longname) {
696 free(file_hdr->name);
697 file_hdr->name = longname;
698 longname = NULL;
699 }
700 if (longlink) {
701 free(file_hdr->link_target);
702 file_hdr->link_target = longlink;
703 longlink = NULL;
704 }
705
706 if ((file_hdr->mode & S_IFREG) &&
707 file_hdr->name[strlen(file_hdr->name)-1] == '/') {
708 file_hdr->name[strlen(file_hdr->name)-1] = '\0';
709 file_hdr->mode &= ~S_IFREG;
710 file_hdr->mode |= S_IFDIR;
711 }
712
713 if ((file_hdr->link_target && *(file_hdr->link_target))
714 || S_ISLNK(file_hdr->mode) || S_ISDIR(file_hdr->mode))
715 file_hdr->size = 0;
716
717 if (filter(TT.exc, file_hdr->name) ||
718 (TT.inc && !filter(TT.inc, file_hdr->name))) goto SKIP;
719 add_to_list(&TT.pass, xstrdup(file_hdr->name));
720
721 if (toys.optflags & FLAG_t) {
722 if (toys.optflags & FLAG_v) {
723 char perm[11];
724 struct tm *lc = localtime((const time_t*)&(file_hdr->mtime));
725
726 mode_to_string(file_hdr->mode, perm);
727 printf("%s %s/%s %9ld %d-%02d-%02d %02d:%02d:%02d ",perm,file_hdr->uname,
728 file_hdr->gname, (long)file_hdr->size, 1900+lc->tm_year,
729 1+lc->tm_mon, lc->tm_mday, lc->tm_hour, lc->tm_min, lc->tm_sec);
730 }
731 printf("%s",file_hdr->name);
732 if (file_hdr->link_target) printf(" -> %s",file_hdr->link_target);
733 xputc('\n');
734 SKIP:
735 tar_skip(tar_hdl, file_hdr->size);
736 } else {
737 if (toys.optflags & FLAG_v) printf("%s\n",file_hdr->name);
738 tar_hdl->extract_handler(tar_hdl);
739 }
740 free(file_hdr->name);
741 free(file_hdr->link_target);
742 free(file_hdr->uname);
743 free(file_hdr->gname);
744 }
745 }
746
tar_main(void)747 void tar_main(void)
748 {
749 struct archive_handler *tar_hdl;
750 int fd = 0;
751 struct arg_list *tmp;
752 char **args = toys.optargs;
753
754 if (!geteuid()) toys.optflags |= FLAG_p;
755
756 for (tmp = TT.exc; tmp; tmp = tmp->next)
757 tmp->arg = xstrdup(tmp->arg); //freeing at the end fails otherwise
758
759 while(*args) add_to_list(&TT.inc, xstrdup(*args++));
760 if (toys.optflags & FLAG_X) add_from_file(&TT.exc, TT.exc_file);
761 if (toys.optflags & FLAG_T) add_from_file(&TT.inc, TT.inc_file);
762
763 if (toys.optflags & FLAG_c) {
764 if (!TT.inc) error_exit("empty archive");
765 fd = 1;
766 }
767 if ((toys.optflags & FLAG_f) && strcmp(TT.fname, "-"))
768 fd = xcreate(TT.fname, fd*(O_WRONLY|O_CREAT|O_TRUNC), 0666);
769 if (toys.optflags & FLAG_C) xchdir(TT.dir);
770
771 tar_hdl = init_handler();
772 tar_hdl->src_fd = fd;
773
774 if ((toys.optflags & FLAG_x) || (toys.optflags & FLAG_t)) {
775 if (toys.optflags & FLAG_O) tar_hdl->extract_handler = extract_to_stdout;
776 if (toys.optflags & FLAG_to_command) {
777 signal(SIGPIPE, SIG_IGN); //will be using pipe between child & parent
778 tar_hdl->extract_handler = extract_to_command;
779 }
780 if (toys.optflags & FLAG_z) extract_stream(tar_hdl);
781 unpack_tar(tar_hdl);
782 for (tmp = TT.inc; tmp; tmp = tmp->next)
783 if (!filter(TT.exc, tmp->arg) && !filter(TT.pass, tmp->arg))
784 error_msg("'%s' not in archive", tmp->arg);
785 } else if (toys.optflags & FLAG_c) {
786 //create the tar here.
787 if (toys.optflags & FLAG_z) compress_stream(tar_hdl);
788 for (tmp = TT.inc; tmp; tmp = tmp->next) {
789 TT.handle = tar_hdl;
790 //recurse thru dir and add files to archive
791 dirtree_handle_callback(dirtree_start(tmp->arg, toys.optflags & FLAG_h),
792 add_to_tar);
793 }
794 memset(toybuf, 0, 1024);
795 writeall(tar_hdl->src_fd, toybuf, 1024);
796 seen_inode(&TT.inodes, 0, 0);
797 }
798
799 if (CFG_TOYBOX_FREE) {
800 close(tar_hdl->src_fd);
801 free(tar_hdl);
802 llist_traverse(TT.exc, llist_free_arg);
803 llist_traverse(TT.inc, llist_free_arg);
804 llist_traverse(TT.pass, llist_free_arg);
805 }
806 }
807