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authorAshwini Sharma <ak.ashwini1981@gmail.com>2014-07-04 21:46:00 -0500
committerAshwini Sharma <ak.ashwini1981@gmail.com>2014-07-04 21:46:00 -0500
commit15e02f09549e34e839a6b74fdfb3c1d1974bb635 (patch)
tree04676c27d59a3cc0b1a552ac827998f595af080a /toys/pending
parentd6f8c41e25428c8a0caf6f52fbe665d3baa06adc (diff)
downloadtoybox-15e02f09549e34e839a6b74fdfb3c1d1974bb635.tar.gz
TAR - this supports archive creation and extraction based on the USTAR format (described in PAX Spec). For (de)compression '-z' gzip is supported.
Diffstat (limited to 'toys/pending')
-rw-r--r--toys/pending/tar.c808
1 files changed, 808 insertions, 0 deletions
diff --git a/toys/pending/tar.c b/toys/pending/tar.c
new file mode 100644
index 00000000..12ee7af5
--- /dev/null
+++ b/toys/pending/tar.c
@@ -0,0 +1,808 @@
+/* tar.c - create/extract archives
+ *
+ * Copyright 2014 Ashwini Kumar <ak.ashwini81@gmail.com>
+ *
+ * USTAR interchange format is of interest in
+ * See http://http://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html
+ * For writing to external program
+ * http://www.gnu.org/software/tar/manual/html_node/Writing-to-an-External-Program.html
+
+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))
+
+config TAR
+ bool "tar"
+ default n
+ help
+ usage: tar -[cxtzhmvO] [-X FILE] [-T FILE] [-f TARFILE] [-C DIR]
+
+ Create, extract, or list files from a tar file
+
+ Operation:
+ c Create
+ f Name of TARFILE ('-' for stdin/out)
+ h Follow symlinks
+ m Don't restore mtime
+ t List
+ v Verbose
+ x Extract
+ z (De)compress using gzip
+ C Change to DIR before operation
+ O Extract to stdout
+ exclude=FILE File to exclude
+ X File with names to exclude
+ T File with names to include
+*/
+#define FOR_tar
+#include "toys.h"
+
+GLOBALS(
+ char *fname;
+ char *dir;
+ struct arg_list *inc_file;
+ struct arg_list *exc_file;
+ char *tocmd;
+ struct arg_list *exc;
+
+ struct arg_list *inc, *pass;
+ void *inodes, *handle;
+)
+
+struct tar_hdr {
+ char name[100], mode[8], uid[8], gid[8],size[12], mtime[12], chksum[8],
+ type, link[100], magic[8], uname[32], gname[32], major[8], minor[8],
+ prefix[155], padd[12];
+};
+
+struct file_header {
+ char *name, *link_target, *uname, *gname;
+ off_t size;
+ uid_t uid;
+ gid_t gid;
+ mode_t mode;
+ time_t mtime;
+ dev_t device;
+};
+
+struct archive_handler {
+ int src_fd;
+ struct file_header file_hdr;
+ off_t offset;
+ void (*extract_handler)(struct archive_handler*);
+};
+
+struct inode_list {
+ struct inode_list *next;
+ char *arg;
+ ino_t ino;
+ dev_t dev;
+};
+
+static void copy_in_out(int src, int dst, off_t size)
+{
+ int i, rd, rem = size%512, cnt;
+
+ cnt = size/512 + (rem?1:0);
+
+ for (i = 0; i < cnt; i++) {
+ rd = (((i == cnt-1) && rem)? rem:512);
+ if (readall(src, toybuf, rd) != rd) error_exit("short read");
+ writeall(dst, toybuf, rd);
+ }
+}
+
+//convert to octal
+static void itoo(char *str, int len, off_t val)
+{
+ char *t, tmp[sizeof(off_t)*3+1]; //1 for NUL termination
+ int cnt = sprintf(tmp, "%0*llo", len, val);
+
+ t = tmp;
+ t += (cnt - len);
+ if (*t == '0') t++;
+ memcpy(str, t, len);
+}
+
+static struct inode_list *seen_inode(void **list, struct stat *st, char *name)
+{
+ if (!st) llist_traverse(*list, llist_free_arg);
+ else if (!S_ISDIR(st->st_mode) && st->st_nlink > 1) {
+ struct inode_list *new;
+
+ for (new = *list; new; new = new->next)
+ if(new->ino == st->st_ino && new->dev == st->st_dev)
+ return new;
+
+ new = xzalloc(sizeof(*new));
+ new->ino = st->st_ino;
+ new->dev = st->st_dev;
+ new->arg = xstrdup(name);
+ new->next = *list;
+ *list = new;
+ }
+ return 0;
+}
+
+static void write_longname(struct archive_handler *tar, char *name, char type)
+{
+ struct tar_hdr tmp;
+ unsigned int sum = 0;
+ int i, sz = strlen(name) +1;
+ char buf[512] = {0,};
+
+ memset(&tmp, 0, sizeof(tmp));
+ strcpy(tmp.name, "././@LongLink");
+ sprintf(tmp.mode, "%0*d", sizeof(tmp.mode)-1, 0);
+ sprintf(tmp.uid, "%0*d", sizeof(tmp.uid)-1, 0);
+ sprintf(tmp.gid, "%0*d", sizeof(tmp.gid)-1, 0);
+ sprintf(tmp.size, "%0*d", sizeof(tmp.size)-1, 0);
+ sprintf(tmp.mtime, "%0*d", sizeof(tmp.mtime)-1, 0);
+ itoo(tmp.size, sizeof(tmp.size), sz);
+ tmp.type = type;
+ memset(tmp.chksum, ' ', 8);
+ strcpy(tmp.magic, "ustar ");
+ for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&tmp)[i];
+ itoo(tmp.chksum, sizeof(tmp.chksum)-1, sum);
+
+ writeall(tar->src_fd, (void*) &tmp, sizeof(tmp));
+ //write name to archive
+ writeall(tar->src_fd, name, sz);
+ if (sz%512) writeall(tar->src_fd, buf, (512-(sz%512)));
+}
+
+static int filter(struct arg_list *lst, char *name)
+{
+ struct arg_list *cur;
+
+ for (cur = lst; cur; cur = cur->next)
+ if (!fnmatch(cur->arg, name, 1<<3)) return 1;
+ return 0;
+}
+
+static void add_file(struct archive_handler *tar, char **nam, struct stat *st)
+{
+ struct tar_hdr hdr;
+ struct passwd *pw;
+ struct group *gr;
+ struct inode_list *node;
+ int i, fd =-1;
+ char *c, *p, *name = *nam, *lnk, *hname, buf[512] = {0,};
+ unsigned int sum = 0;
+ static int warn = 1;
+
+ for (p = name; *p; p++)
+ if ((p == name || p[-1] == '/') && *p != '/'
+ && filter(TT.exc, p)) return;
+
+ if (S_ISDIR(st->st_mode) && name[strlen(name)-1] != '/') {
+ lnk = xmprintf("%s/",name);
+ free(name);
+ *nam = name = lnk;
+ }
+ hname = name;
+ //remove leading '/' or relative path '../' component
+ if (*hname == '/') hname++;
+ if (!*hname) return;
+ while ((c = strstr(hname, "../"))) hname = c + 3;
+ if (warn && hname != name) {
+ printf("removing leading '%.*s' "
+ "from member names\n",hname-name, name);
+ warn = 0;
+ }
+
+ memset(&hdr, 0, sizeof(hdr));
+ strncpy(hdr.name, hname, sizeof(hdr.name));
+ itoo(hdr.mode, sizeof(hdr.mode), st->st_mode &07777);
+ itoo(hdr.uid, sizeof(hdr.uid), st->st_uid);
+ itoo(hdr.gid, sizeof(hdr.gid), st->st_gid);
+ itoo(hdr.size, sizeof(hdr.size), 0); //set size later
+ itoo(hdr.mtime, sizeof(hdr.mtime), st->st_mtime);
+ for (i=0; i<sizeof(hdr.chksum); i++) hdr.chksum[i] = ' ';
+
+ if ((node = seen_inode(&TT.inodes, st, hname))) {
+ //this is a hard link
+ hdr.type = '1';
+ if (strlen(node->arg) > sizeof(hdr.link))
+ write_longname(tar, hname, 'K'); //write longname LINK
+ strncpy(hdr.link, node->arg, sizeof(hdr.link));
+ } else if (S_ISREG(st->st_mode)) {
+ hdr.type = '0';
+ if (st->st_size <= (off_t)0777777777777LL)
+ itoo(hdr.size, sizeof(hdr.size), st->st_size);
+ else {
+ error_msg("can't store file '%s' of size '%d'\n", hname, st->st_size);
+ return;
+ }
+ } else if (S_ISLNK(st->st_mode)) {
+ hdr.type = '2'; //'K' long link
+ if (!(lnk = xreadlink(name))) {
+ perror_msg("readlink");
+ return;
+ }
+ if (strlen(lnk) > sizeof(hdr.link))
+ write_longname(tar, hname, 'K'); //write longname LINK
+ strncpy(hdr.link, lnk, sizeof(hdr.link));
+ free(lnk);
+ }
+ else if (S_ISDIR(st->st_mode)) hdr.type = '5';
+ else if (S_ISFIFO(st->st_mode)) hdr.type = '6';
+ else if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
+ hdr.type = (S_ISCHR(st->st_mode))?'3':'4';
+ itoo(hdr.major, sizeof(hdr.major), major(st->st_rdev));
+ itoo(hdr.minor, sizeof(hdr.minor), minor(st->st_rdev));
+ } else {
+ error_msg("unknown file type '%s'");
+ return;
+ }
+ if (strlen(hname) > sizeof(hdr.name))
+ write_longname(tar, hname, 'L'); //write longname NAME
+ strcpy(hdr.magic, "ustar ");
+ if ((pw = getpwuid(st->st_uid)))
+ snprintf(hdr.uname, sizeof(hdr.uname), "%s", pw->pw_name);
+ else snprintf(hdr.uname, sizeof(hdr.uname), "%d", st->st_uid);
+
+ if ((gr = getgrgid(st->st_gid)))
+ snprintf(hdr.gname, sizeof(hdr.gname), "%s", gr->gr_name);
+ else snprintf(hdr.gname, sizeof(hdr.gname), "%d", st->st_gid);
+
+ //calculate chksum.
+ for (i= 0; i < 512; i++) sum += (unsigned int)((char*)&hdr)[i];
+ itoo(hdr.chksum, sizeof(hdr.chksum)-1, sum);
+ if (toys.optflags & FLAG_v) printf("%s\n",hname);
+ writeall(tar->src_fd, (void*)&hdr, 512);
+
+ //write actual data to archive
+ if (hdr.type != '0') return; //nothing to write
+ if ((fd = open(name, O_RDONLY)) < 0) {
+ perror_msg("can't open '%s'", name);
+ return;
+ }
+ copy_in_out(fd, tar->src_fd, st->st_size);
+ if (st->st_size%512) writeall(tar->src_fd, buf, (512-(st->st_size%512)));
+ close(fd);
+}
+
+static int add_to_tar(struct dirtree *node)
+{
+ struct stat st;
+ char *path;
+ struct archive_handler *hdl = (struct archive_handler*)TT.handle;
+
+ if (!fstat(hdl->src_fd, &st) && st.st_dev == node->st.st_dev
+ && st.st_ino == node->st.st_ino) {
+ error_msg("'%s' file is the archive; not dumped", TT.fname);
+ return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
+ }
+
+ if (node->parent && !dirtree_notdotdot(node)) return 0;
+ path = dirtree_path(node, 0);
+ add_file(hdl, &path, &(node->st)); //path may be modified
+ free(path);
+ if (toys.optflags & FLAG_no_recursion) return 0;
+ return ((DIRTREE_RECURSE | ((toys.optflags & FLAG_h)?DIRTREE_SYMFOLLOW:0)));
+}
+
+static void compress_stream(struct archive_handler *tar_hdl)
+{
+ int pipefd[2];
+ pid_t cpid;
+
+ if (pipe(pipefd) == -1) error_exit("pipe");
+
+ signal(SIGPIPE, SIG_IGN);
+ cpid = fork();
+ if (cpid == -1) perror_exit("fork");
+
+ if (!cpid) { /* Child reads from pipe */
+ char *argv[] = {"gzip", "-f", NULL};
+ xclose(pipefd[1]); /* Close unused write*/
+ dup2(pipefd[0], 0);
+ dup2(tar_hdl->src_fd, 1); //write to tar fd
+ xexec(argv);
+ } else {
+ xclose(pipefd[0]); /* Close unused read end */
+ dup2(pipefd[1], tar_hdl->src_fd); //write to pipe
+ }
+}
+
+static void extract_to_stdout(struct archive_handler *tar)
+{
+ struct file_header *file_hdr = &tar->file_hdr;
+
+ copy_in_out(tar->src_fd, 0, file_hdr->size);
+ tar->offset += file_hdr->size;
+}
+
+static void extract_to_command(struct archive_handler *tar)
+{
+ int pipefd[2], status = 0;
+ pid_t cpid;
+ struct file_header *file_hdr = &tar->file_hdr;
+
+ if (pipe(pipefd) == -1) error_exit("pipe");
+ if (!S_ISREG(file_hdr->mode)) return; //only regular files are supported.
+
+ cpid = fork();
+ if (cpid == -1) perror_exit("fork");
+
+ if (!cpid) { // Child reads from pipe
+ char buf[64], *argv[4] = {"sh", "-c", TT.tocmd, NULL};
+
+ setenv("TAR_FILETYPE", "f", 1);
+ sprintf(buf, "%0o", file_hdr->mode);
+ setenv("TAR_MODE", buf, 1);
+ sprintf(buf, "%ld", (long)file_hdr->size);
+ setenv("TAR_SIZE", buf, 1);
+ setenv("TAR_FILENAME", file_hdr->name, 1);
+ setenv("TAR_UNAME", file_hdr->uname, 1);
+ setenv("TAR_GNAME", file_hdr->gname, 1);
+ sprintf(buf, "%0o", (int)file_hdr->mtime);
+ setenv("TAR_MTIME", buf, 1);
+ sprintf(buf, "%0o", file_hdr->uid);
+ setenv("TAR_UID", buf, 1);
+ sprintf(buf, "%0o", file_hdr->gid);
+ setenv("TAR_GID", buf, 1);
+
+ xclose(pipefd[1]); // Close unused write
+ dup2(pipefd[0], 0);
+ signal(SIGPIPE, SIG_DFL);
+ xexec(argv);
+ } else {
+ xclose(pipefd[0]); // Close unused read end
+ copy_in_out(tar->src_fd, pipefd[1], file_hdr->size);
+ tar->offset += file_hdr->size;
+ xclose(pipefd[1]);
+ waitpid(cpid, &status, 0);
+ if (WIFSIGNALED(status))
+ xprintf("tar : %d: child returned %d\n", cpid, WTERMSIG(status));
+ }
+}
+
+static void extract_to_disk(struct archive_handler *tar)
+{
+ int flags, dst_fd = -1;
+ char *s;
+ struct stat ex;
+ struct file_header *file_hdr = &tar->file_hdr;
+
+ if (file_hdr->name[strlen(file_hdr->name)-1] == '/')
+ file_hdr->name[strlen(file_hdr->name)-1] = 0;
+ //Regular file with preceding path
+ if ((s = strrchr(file_hdr->name, '/'))) {
+ if (mkpathat(AT_FDCWD, file_hdr->name, 00, 2) && errno !=EEXIST) {
+ error_msg(":%s: not created", file_hdr->name);
+ return;
+ }
+ }
+
+ //remove old file, if exists
+ if (!(toys.optflags & FLAG_k) && !S_ISDIR(file_hdr->mode)
+ && !lstat( file_hdr->name, &ex)) {
+ if (unlink(file_hdr->name)) {
+ perror_msg("can't remove: %s",file_hdr->name);
+ }
+ }
+
+ //hard link
+ if (S_ISREG(file_hdr->mode) && file_hdr->link_target) {
+ if (link(file_hdr->link_target, file_hdr->name))
+ perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
+ goto COPY;
+ }
+
+ switch (file_hdr->mode & S_IFMT) {
+ case S_IFREG:
+ flags = O_WRONLY|O_CREAT|O_EXCL;
+ if (toys.optflags & FLAG_overwrite) flags = O_WRONLY|O_CREAT|O_TRUNC;
+ dst_fd = open(file_hdr->name, flags, file_hdr->mode & 07777);
+ if (dst_fd == -1) perror_msg("%s: can't open", file_hdr->name);
+ break;
+ case S_IFDIR:
+ if ((mkdir(file_hdr->name, file_hdr->mode) == -1) && errno != EEXIST)
+ perror_msg("%s: can't create", file_hdr->name);
+ break;
+ case S_IFLNK:
+ if (symlink(file_hdr->link_target, file_hdr->name))
+ perror_msg("can't link '%s' -> '%s'",file_hdr->name, file_hdr->link_target);
+ break;
+ case S_IFBLK:
+ case S_IFCHR:
+ case S_IFIFO:
+ if (mknod(file_hdr->name, file_hdr->mode, file_hdr->device))
+ perror_msg("can't create '%s'", file_hdr->name);
+ break;
+ default:
+ printf("type not yet supported\n");
+ break;
+ }
+
+ //copy file....
+COPY:
+ copy_in_out(tar->src_fd, dst_fd, file_hdr->size);
+ tar->offset += file_hdr->size;
+ close(dst_fd);
+
+ if (S_ISLNK(file_hdr->mode)) return;
+ if (!(toys.optflags & FLAG_o)) {
+ //set ownership..., --no-same-owner, --numeric-owner
+ uid_t u = file_hdr->uid;
+ gid_t g = file_hdr->gid;
+
+ if (!(toys.optflags & FLAG_numeric_owner)) {
+ struct group *gr = getgrnam(file_hdr->gname);
+ struct passwd *pw = getpwnam(file_hdr->uname);
+ if (pw) u = pw->pw_uid;
+ if (gr) g = gr->gr_gid;
+ }
+ chown(file_hdr->name, u, g);
+ }
+
+ if (toys.optflags & FLAG_p) // || !(toys.optflags & FLAG_no_same_permissions))
+ chmod(file_hdr->name, file_hdr->mode);
+
+ //apply mtime
+ if (!(toys.optflags & FLAG_m)) {
+ struct timeval times[2] = {{file_hdr->mtime, 0},{file_hdr->mtime, 0}};
+ utimes(file_hdr->name, times);
+ }
+}
+
+static void add_to_list(struct arg_list **llist, char *name)
+{
+ struct arg_list **list = llist;
+
+ while (*list) list=&((*list)->next);
+ *list = xzalloc(sizeof(struct arg_list));
+ (*list)->arg = name;
+ if ((name[strlen(name)-1] == '/') && strlen(name) != 1)
+ name[strlen(name)-1] = '\0';
+}
+
+static void add_from_file(struct arg_list **llist, struct arg_list *flist)
+{
+ char *line = NULL;
+
+ while (flist) {
+ int fd = 0;
+
+ if (strcmp((char *)flist->arg, "-"))
+ fd = xopen((char *)flist->arg, O_RDONLY);
+
+ while ((line = get_line(fd))) {
+ add_to_list(llist, line);
+ }
+ if (fd) close(fd);
+ flist = flist->next;
+ }
+}
+
+static struct archive_handler *init_handler()
+{
+ struct archive_handler *tar_hdl = xzalloc(sizeof(struct archive_handler));
+ tar_hdl->extract_handler = extract_to_disk;
+ return tar_hdl;
+}
+
+//convert octal to int
+static int otoi(char *str, int len)
+{
+ long val;
+ char *endp, inp[len+1]; //1 for NUL termination
+
+ memcpy(inp, str, len);
+ inp[len] = '\0'; //nul-termination made sure
+ val = strtol(inp, &endp, 8);
+ if (*endp && *endp != ' ') error_exit("invalid param");
+ return (int)val;
+}
+
+static void extract_stream(struct archive_handler *tar_hdl)
+{
+ int pipefd[2];
+ pid_t cpid;
+
+ if (pipe(pipefd) == -1) error_exit("pipe");
+
+ cpid = fork();
+ if (cpid == -1) perror_exit("fork");
+
+ if (!cpid) { /* Child reads from pipe */
+ char *argv[] = {"gunzip", "-cf", "-", NULL};
+ xclose(pipefd[0]); /* Close unused read*/
+ dup2(tar_hdl->src_fd, 0);
+ dup2(pipefd[1], 1); //write to pipe
+ xexec(argv);
+ } else {
+ xclose(pipefd[1]); /* Close unused read end */
+ dup2(pipefd[0], tar_hdl->src_fd); //read from pipe
+ }
+}
+
+static char *process_extended_hdr(struct archive_handler *tar, int size)
+{
+ char *value = NULL, *p, *buf = xzalloc(size+1);
+
+ if (readall(tar->src_fd, buf, size) != size) error_exit("short read");
+ buf[size] = 0;
+ tar->offset += size;
+ p = buf;
+
+ while (size) {
+ char *key;
+ int len, n;
+
+ // extended records are of the format: "LEN NAME=VALUE\n"
+ sscanf(p, "%d %n", &len, &n);
+ key = p + n;
+ p += len;
+ size -= len;
+ p[-1] = 0;
+ if (size < 0) {
+ error_msg("corrupted extended header");
+ break;
+ }
+
+ len = strlen("path=");
+ if (!strncmp(key, "path=", len)) {
+ value = key + strlen("path=");
+ break;
+ }
+ }
+ return ((value)?xstrdup(value) : NULL);
+}
+
+static void tar_skip(struct archive_handler *tar, int sz)
+{
+ int x;
+
+ while ((x = lskip(tar->src_fd, sz))) {
+ tar->offset += sz - x;
+ sz = x;
+ }
+ tar->offset += sz;
+}
+
+static void unpack_tar(struct archive_handler *tar_hdl)
+{
+ struct tar_hdr tar;
+ struct file_header *file_hdr;
+ int i, j, maj, min, sz, e = 0;
+ unsigned int cksum;
+ unsigned char *gzMagic;
+ char *longname = NULL, *longlink = NULL;
+
+ while (1) {
+ cksum = 0;
+ if (tar_hdl->offset % 512) {
+ sz = 512 - tar_hdl->offset % 512;
+ tar_skip(tar_hdl, sz);
+ }
+ i = readall(tar_hdl->src_fd, &tar, 512);
+ tar_hdl->offset += i;
+ if (i != 512) {
+ if (i >= 2) goto CHECK_MAGIC; //may be a small (<512 byte)zipped file
+ error_exit("read error");
+ }
+
+ if (!tar.name[0]) {
+ if (e) return; //end of tar 2 empty blocks
+ e = 1;//empty jump to next block
+ continue;
+ }
+ if (strncmp(tar.magic, "ustar", 5)) {
+ //try detecting by reading magic
+CHECK_MAGIC:
+ gzMagic = (unsigned char*)&tar;
+ if ((gzMagic[0] == 0x1f) && (gzMagic[1] == 0x8b)
+ && !lseek(tar_hdl->src_fd, -i, SEEK_CUR)) {
+ tar_hdl->offset -= i;
+ extract_stream(tar_hdl);
+ continue;
+ }
+ error_exit("invalid tar format");
+ }
+
+ for (j = 0; j<148; j++) cksum += (unsigned int)((char*)&tar)[j];
+ for (j = 156; j<500; j++) cksum += (unsigned int)((char*)&tar)[j];
+ //cksum field itself treated as ' '
+ for ( j= 0; j<8; j++) cksum += (unsigned int)' ';
+
+ if (cksum != otoi(tar.chksum, sizeof(tar.chksum))) error_exit("wrong cksum");
+
+ file_hdr = &tar_hdl->file_hdr;
+ memset(file_hdr, 0, sizeof(struct file_header));
+ file_hdr->mode = otoi(tar.mode, sizeof(tar.mode));
+ file_hdr->uid = otoi(tar.uid, sizeof(tar.uid));
+ file_hdr->gid = otoi(tar.gid, sizeof(tar.gid));
+ file_hdr->size = otoi(tar.size, sizeof(tar.size));
+ file_hdr->mtime = otoi(tar.mtime, sizeof(tar.mtime));
+ file_hdr->uname = xstrdup(tar.uname);
+ file_hdr->gname = xstrdup(tar.gname);
+ maj = otoi(tar.major, sizeof(tar.major));
+ min = otoi(tar.minor, sizeof(tar.minor));
+ file_hdr->device = makedev(maj, min);
+
+ if (tar.type <= '7') {
+ if (tar.link[0]) {
+ sz = sizeof(tar.link);
+ file_hdr->link_target = xmalloc(sz + 1);
+ memcpy(file_hdr->link_target, tar.link, sz);
+ file_hdr->link_target[sz] = '\0';
+ }
+
+ file_hdr->name = xzalloc(256);// pathname supported size
+ if (tar.prefix[0]) {
+ memcpy(file_hdr->name, tar.prefix, sizeof(tar.prefix));
+ sz = strlen(file_hdr->name);
+ if (file_hdr->name[sz-1] != '/') file_hdr->name[sz] = '/';
+ }
+ sz = strlen(file_hdr->name);
+ memcpy(file_hdr->name + sz, tar.name, sizeof(tar.name));
+ if (file_hdr->name[255]) error_exit("filename too long");
+ }
+
+ switch (tar.type) {
+ // case '\0':
+ case '0':
+ case '7':
+ case '1': //Hard Link
+ file_hdr->mode |= S_IFREG;
+ break;
+ case '2':
+ file_hdr->mode |= S_IFLNK;
+ break;
+ case '3':
+ file_hdr->mode |= S_IFCHR;
+ break;
+ case '4':
+ file_hdr->mode |= S_IFBLK;
+ break;
+ case '5':
+ file_hdr->mode |= S_IFDIR;
+ break;
+ case '6':
+ file_hdr->mode |= S_IFIFO;
+ break;
+ case 'K':
+ longlink = xzalloc(file_hdr->size +1);
+ xread(tar_hdl->src_fd, longlink, file_hdr->size);
+ tar_hdl->offset += file_hdr->size;
+ continue;
+ case 'L':
+ free(longname);
+ longname = xzalloc(file_hdr->size +1);
+ xread(tar_hdl->src_fd, longname, file_hdr->size);
+ tar_hdl->offset += file_hdr->size;
+ continue;
+ case 'D':
+ case 'M':
+ case 'N':
+ case 'S':
+ case 'V':
+ case 'g': // pax global header
+ tar_skip(tar_hdl, file_hdr->size);
+ continue;
+ case 'x': // pax extended header
+ free(longname);
+ longname = process_extended_hdr(tar_hdl, file_hdr->size);
+ continue;
+ default: break;
+ }
+
+ if (longname) {
+ free(file_hdr->name);
+ file_hdr->name = longname;
+ longname = NULL;
+ }
+ if (longlink) {
+ free(file_hdr->link_target);
+ file_hdr->link_target = longlink;
+ longlink = NULL;
+ }
+
+ if ((file_hdr->mode & S_IFREG) &&
+ file_hdr->name[strlen(file_hdr->name)-1] == '/') {
+ file_hdr->name[strlen(file_hdr->name)-1] = '\0';
+ file_hdr->mode &= ~S_IFREG;
+ file_hdr->mode |= S_IFDIR;
+ }
+
+ if ((file_hdr->link_target && *(file_hdr->link_target))
+ || S_ISLNK(file_hdr->mode) || S_ISDIR(file_hdr->mode))
+ file_hdr->size = 0;
+
+ if (filter(TT.exc, file_hdr->name) ||
+ (TT.inc && !filter(TT.inc, file_hdr->name))) goto SKIP;
+ add_to_list(&TT.pass, xstrdup(file_hdr->name));
+
+ if (toys.optflags & FLAG_t) {
+ if (toys.optflags & FLAG_v) {
+ char perm[11];
+ struct tm *lc = localtime((const time_t*)&(file_hdr->mtime));
+
+ mode_to_string(file_hdr->mode, perm);
+ printf("%s %s/%s %9ld %d-%02d-%02d %02d:%02d:%02d ",perm,file_hdr->uname,
+ file_hdr->gname, (long)file_hdr->size, 1900+lc->tm_year,
+ 1+lc->tm_mon, lc->tm_mday, lc->tm_hour, lc->tm_min, lc->tm_sec);
+ }
+ printf("%s",file_hdr->name);
+ if (file_hdr->link_target) printf(" -> %s",file_hdr->link_target);
+ xputc('\n');
+SKIP:
+ tar_skip(tar_hdl, file_hdr->size);
+ } else {
+ if (toys.optflags & FLAG_v) printf("%s\n",file_hdr->name);
+ tar_hdl->extract_handler(tar_hdl);
+ }
+ free(file_hdr->name);
+ free(file_hdr->link_target);
+ free(file_hdr->uname);
+ free(file_hdr->gname);
+ }
+}
+
+void tar_main(void)
+{
+ struct archive_handler *tar_hdl;
+ int fd = 0, flags = O_RDONLY;
+ struct arg_list *tmp;
+ char **args = toys.optargs;
+
+ if (!toys.argv[1]) {
+ toys.exithelp++;
+ error_exit(NULL);
+ }
+
+ if (!geteuid()) toys.optflags |= FLAG_p;
+
+ for (tmp = TT.exc; tmp; tmp = tmp->next)
+ tmp->arg = xstrdup(tmp->arg); //freeing at the end fails otherwise
+
+ while(*args) add_to_list(&TT.inc, xstrdup(*args++));
+ if (toys.optflags & FLAG_X) add_from_file(&TT.exc, TT.exc_file);
+ if (toys.optflags & FLAG_T) add_from_file(&TT.inc, TT.inc_file);
+
+ if (toys.optflags & FLAG_c) {
+ if (!TT.inc) error_exit("empty archive");
+ fd = 1, flags = O_WRONLY|O_CREAT|O_TRUNC;
+ }
+ if ((toys.optflags & FLAG_f) && strcmp(TT.fname, "-"))
+ fd = xcreate(TT.fname, flags, 0666);
+ if (toys.optflags & FLAG_C) xchdir(TT.dir);
+
+ tar_hdl = init_handler();
+ tar_hdl->src_fd = fd;
+
+ if (toys.optflags & FLAG_x || toys.optflags & FLAG_t) {
+ if (toys.optflags & FLAG_O) tar_hdl->extract_handler = extract_to_stdout;
+ if (toys.optflags & FLAG_to_command) {
+ signal(SIGPIPE, SIG_IGN); //will be using pipe between child & parent
+ tar_hdl->extract_handler = extract_to_command;
+ }
+ if (toys.optflags & FLAG_z) extract_stream(tar_hdl);
+ unpack_tar(tar_hdl);
+ for (tmp = TT.inc; tmp; tmp = tmp->next)
+ if (!filter(TT.exc, tmp->arg) && !filter(TT.pass, tmp->arg))
+ error_msg("'%s' not in archive", tmp->arg);
+ } else if (toys.optflags & FLAG_c) {
+ //create the tar here.
+ if (toys.optflags & FLAG_z) compress_stream(tar_hdl);
+ for (tmp = TT.inc; tmp; tmp = tmp->next) {
+ TT.handle = tar_hdl;
+ //recurse thru dir and add files to archive
+ struct dirtree *root = dirtree_add_node(0,tmp->arg,toys.optflags & FLAG_h);
+
+ if (root) dirtree_handle_callback(root, add_to_tar);
+ }
+ memset(toybuf, 0, 1024);
+ writeall(tar_hdl->src_fd, toybuf, 1024);
+ seen_inode(&TT.inodes, 0, 0);
+ }
+
+ if (CFG_TOYBOX_FREE) {
+ close(tar_hdl->src_fd);
+ free(tar_hdl);
+ llist_traverse(TT.exc, llist_free_arg);
+ llist_traverse(TT.inc, llist_free_arg);
+ llist_traverse(TT.pass, llist_free_arg);
+ }
+}