コード例 #1
0
ファイル: fallocate.c プロジェクト: farrellpeng/MX283Linux
int fallocate_main(int argc UNUSED_PARAM, char **argv)
{
	const char *str_l;
	const char *str_o = "0";
	off_t ofs, len;
	unsigned opts;
	int fd;

	/* exactly one non-option arg */
	opt_complementary = "=1";
	opts = getopt32(argv, "l:o:", &str_l, &str_o);
	if (!(opts & 1))
		bb_show_usage();

	ofs = xatoull_sfx(str_o, kmg_i_suffixes);
	len = xatoull_sfx(str_l, kmg_i_suffixes);

	argv += optind;
	fd = xopen3(*argv, O_RDWR | O_CREAT, 0666);

	/* posix_fallocate has unusual method of returning error */
	/* maybe use Linux-specific fallocate(int fd, int mode, off_t offset, off_t len) instead? */
	if ((errno = posix_fallocate(fd, ofs, len)) != 0)
		bb_perror_msg_and_die("fallocate '%s'", *argv);

	/* util-linux also performs fsync(fd); */

	return EXIT_SUCCESS;
}
コード例 #2
0
int nohup_main(int argc UNUSED_PARAM, char **argv)
{
	const char *nohupout;
	char *home;

	xfunc_error_retval = 127;

	if (!argv[1]) {
		bb_show_usage();
	}

	/* If stdin is a tty, detach from it. */
	if (isatty(STDIN_FILENO)) {
		/* bb_error_msg("ignoring input"); */
		close(STDIN_FILENO);
		xopen(bb_dev_null, O_RDONLY); /* will be fd 0 (STDIN_FILENO) */
	}

	nohupout = "nohup.out";
	/* Redirect stdout to nohup.out, either in "." or in "$HOME". */
	if (isatty(STDOUT_FILENO)) {
		close(STDOUT_FILENO);
		if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
			home = getenv("HOME");
			if (home) {
				nohupout = concat_path_file(home, nohupout);
				xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
			} else {
				xopen(bb_dev_null, O_RDONLY); /* will be fd 1 */
			}
		}
		bb_error_msg("appending output to %s", nohupout);
	}

	/* If we have a tty on stderr, redirect to stdout. */
	if (isatty(STDERR_FILENO)) {
		/* if (stdout_wasnt_a_tty)
			bb_error_msg("redirecting stderr to stdout"); */
		dup2(STDOUT_FILENO, STDERR_FILENO);
	}

	signal(SIGHUP, SIG_IGN);

	BB_EXECVP(argv[1], argv+1);
	bb_simple_perror_msg_and_die(argv[1]);
}
コード例 #3
0
ファイル: nohup.c プロジェクト: acassis/emlinux-ssd1935
int nohup_main(int argc, char **argv)
{
	int nullfd;
	const char *nohupout;
	char *home = NULL;

	xfunc_error_retval = 127;

	if (argc < 2) bb_show_usage();

	nullfd = xopen(bb_dev_null, O_WRONLY|O_APPEND);
	/* If stdin is a tty, detach from it. */
	if (isatty(STDIN_FILENO))
		dup2(nullfd, STDIN_FILENO);

	nohupout = "nohup.out";
	/* Redirect stdout to nohup.out, either in "." or in "$HOME". */
	if (isatty(STDOUT_FILENO)) {
		close(STDOUT_FILENO);
		if (open(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR) < 0) {
			home = getenv("HOME");
			if (home) {
				nohupout = concat_path_file(home, nohupout);
				xopen3(nohupout, O_CREAT|O_WRONLY|O_APPEND, S_IRUSR|S_IWUSR);
			}
		}
	} else dup2(nullfd, STDOUT_FILENO);

	/* If we have a tty on stderr, announce filename and redirect to stdout.
	 * Else redirect to /dev/null.
	 */
	if (isatty(STDERR_FILENO)) {
		bb_error_msg("appending to %s", nohupout);
		dup2(STDOUT_FILENO, STDERR_FILENO);
	} else dup2(nullfd, STDERR_FILENO);

	if (nullfd > 2)
		close(nullfd);
	signal(SIGHUP, SIG_IGN);

	BB_EXECVP(argv[1], argv+1);
	if (ENABLE_FEATURE_CLEAN_UP && home)
		free((char*)nohupout);
	bb_simple_perror_msg_and_die(argv[1]);
}
コード例 #4
0
// Die if we can't open a file and return a fd.
int FAST_FUNC xopen(const char *pathname, int flags)
{
	return xopen3(pathname, flags, 0666);
}
コード例 #5
0
int add_remove_shell_main(int argc UNUSED_PARAM, char **argv)
{
	FILE *orig_fp;
	char *orig_fn;
	char *new_fn;
	struct stat sb;

	sb.st_mode = 0666;

	argv++;

	orig_fn = xmalloc_follow_symlinks(SHELLS_FILE);
	if (!orig_fn)
		return EXIT_FAILURE;
	orig_fp = fopen_for_read(orig_fn);
	if (orig_fp)
		xfstat(fileno(orig_fp), &sb, orig_fn);

	new_fn = xasprintf("%s.tmp", orig_fn);
	/*
	 * O_TRUNC or O_EXCL? At the first glance, O_EXCL looks better,
	 * since it prevents races. But: (1) it requires a retry loop,
	 * (2) if /etc/shells.tmp is *stale*, then retry loop
	 * with O_EXCL will never succeed - it should have a timeout,
	 * after which it should revert to O_TRUNC.
	 * For now, I settle for O_TRUNC instead.
	 */
	xmove_fd(xopen3(new_fn, O_WRONLY | O_CREAT | O_TRUNC, sb.st_mode), STDOUT_FILENO);
	/* TODO?
	xfchown(STDOUT_FILENO, sb.st_uid, sb.st_gid);
	*/

	if (orig_fp) {
		/* Copy old file, possibly skipping removed shell names */
		char *line;
		while ((line = xmalloc_fgetline(orig_fp)) != NULL) {
			char **cpp = argv;
			while (*cpp) {
				if (*cpp != dont_add && strcmp(*cpp, line) == 0) {
					/* Old file has this shell name */
					if (REMOVE_SHELL) {
						/* we are remove-shell */
						/* delete this name by not copying it */
						goto next_line;
					}
					/* we are add-shell */
					/* mark this name as "do not add" */
					*cpp = dont_add;
				}
				cpp++;
			}
			/* copy shell name from old to new file */
			puts(line);
 next_line:
			free(line);
		}
		if (ENABLE_FEATURE_CLEAN_UP)
			fclose(orig_fp);
	}

	if (ADD_SHELL) {
		char **cpp = argv;
		while (*cpp) {
			if (*cpp != dont_add)
				puts(*cpp);
			cpp++;
		}
	}

	/* Ensure we wrote out everything */
	if (fclose(stdout) != 0) {
		xunlink(new_fn);
		bb_perror_msg_and_die("%s: write error", new_fn);
	}

	/* Small hole: if rename fails, /etc/shells.tmp is not removed */
	xrename(new_fn, orig_fn);

	if (ENABLE_FEATURE_CLEAN_UP) {
		free(orig_fn);
		free(new_fn);
	}

	return EXIT_SUCCESS;
}
コード例 #6
0
ファイル: data_extract_all.c プロジェクト: ph4r05/boinc
void data_extract_all(archive_handle_t *archive_handle)
{
	file_header_t *file_header = archive_handle->file_header;
	int dst_fd;
	int res;

	if (archive_handle->flags & ARCHIVE_CREATE_LEADING_DIRS) {
		char *name = xstrdup(file_header->name);
		bb_make_directory(dirname(name), -1, FILEUTILS_RECUR);
		free(name);
	}

	/* Check if the file already exists */
	if (archive_handle->flags & ARCHIVE_EXTRACT_UNCONDITIONAL) {
		/* Remove the existing entry if it exists */
		if (((file_header->mode & S_IFMT) != S_IFDIR)
		 && (unlink(file_header->name) == -1)
		 && (errno != ENOENT)
		) {
			bb_perror_msg_and_die("cannot remove old file %s",
					file_header->name);
		}
	}
	else if (archive_handle->flags & ARCHIVE_EXTRACT_NEWER) {
		/* Remove the existing entry if its older than the extracted entry */
		struct stat statbuf;
		if (lstat(file_header->name, &statbuf) == -1) {
			if (errno != ENOENT) {
				bb_perror_msg_and_die("cannot stat old file");
			}
		}
		else if (statbuf.st_mtime <= file_header->mtime) {
			if (!(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
				bb_error_msg("%s not created: newer or "
					"same age file exists", file_header->name);
			}
			data_skip(archive_handle);
			return;
		}
		else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
			bb_perror_msg_and_die("cannot remove old file %s",
					file_header->name);
		}
	}

	/* Handle hard links separately
	 * We identified hard links as regular files of size 0 with a symlink */
	if (S_ISREG(file_header->mode) && (file_header->link_target)
	 && (file_header->size == 0)
	) {
		/* hard link */
		res = link(file_header->link_target, file_header->name);
		if ((res == -1) && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)) {
			bb_perror_msg("cannot create %slink "
					"from %s to %s", "hard",
					file_header->name,
					file_header->link_target);
		}
	} else {
		/* Create the filesystem entry */
		switch (file_header->mode & S_IFMT) {
		case S_IFREG: {
			/* Regular file */
			dst_fd = xopen3(file_header->name, O_WRONLY | O_CREAT | O_EXCL,
							file_header->mode);
			bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
			close(dst_fd);
			break;
		}
		case S_IFDIR:
			res = mkdir(file_header->name, file_header->mode);
			if ((res == -1) && (errno != EISDIR)
			 && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("cannot make dir %s", file_header->name);
			}
			break;
		case S_IFLNK:
			/* Symlink */
			res = symlink(file_header->link_target, file_header->name);
			if ((res == -1)
			 && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("cannot create %slink "
					"from %s to %s", "sym",
					file_header->name,
					file_header->link_target);
			}
			break;
#ifndef _WIN32
		case S_IFSOCK:
		case S_IFBLK:
		case S_IFCHR:
		case S_IFIFO:
			res = mknod(file_header->name, file_header->mode, file_header->device);
			if ((res == -1)
			 && !(archive_handle->flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("cannot create node %s", file_header->name);
			}
			break;
#endif
		default:
			bb_error_msg_and_die("unrecognized file type");
		}
	}

#ifndef _WIN32
	if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_OWN)) {
#if ENABLE_FEATURE_TAR_UNAME_GNAME
		uid_t uid = file_header->uid;
		gid_t gid = file_header->gid;

		if (file_header->uname) {
			struct passwd *pwd = getpwnam(file_header->uname);
			if (pwd) uid = pwd->pw_uid;
		}
		if (file_header->gname) {
			struct group *grp = getgrnam(file_header->gname);
			if (grp) gid = grp->gr_gid;
		}
		lchown(file_header->name, uid, gid);
#else
		lchown(file_header->name, file_header->uid, file_header->gid);
#endif
	}
#endif
	if ((file_header->mode & S_IFMT) != S_IFLNK) {
		/* uclibc has no lchmod, glibc is even stranger -
		 * it has lchmod which seems to do nothing!
		 * so we use chmod... */
		if (!(archive_handle->flags & ARCHIVE_NOPRESERVE_PERM)) {
			chmod(file_header->name, file_header->mode);
		}
		/* same for utime */
		if (archive_handle->flags & ARCHIVE_PRESERVE_DATE) {
			struct utimbuf t;
			t.actime = t.modtime = file_header->mtime;
			utime(file_header->name, &t);
		}
	}
}
コード例 #7
0
ファイル: crontab.c プロジェクト: WiseMan787/ralink_sdk
int crontab_main(int argc UNUSED_PARAM, char **argv)
{
	const struct passwd *pas;
	const char *crontab_dir = CRONTABS;
	char *tmp_fname;
	char *new_fname;
	char *user_name;  /* -u USER */
	int fd;
	int src_fd;
	int opt_ler;

	/* file [opts]     Replace crontab from file
	 * - [opts]        Replace crontab from stdin
	 * -u user         User
	 * -c dir          Crontab directory
	 * -l              List crontab for user
	 * -e              Edit crontab for user
	 * -r              Delete crontab for user
	 * bbox also supports -d == -r, but most other crontab
	 * implementations do not. Deprecated.
	 */
	enum {
		OPT_u = (1 << 0),
		OPT_c = (1 << 1),
		OPT_l = (1 << 2),
		OPT_e = (1 << 3),
		OPT_r = (1 << 4),
		OPT_ler = OPT_l + OPT_e + OPT_r,
	};

	opt_complementary = "?1:dr"; /* max one argument; -d implies -r */
	opt_ler = getopt32(argv, "u:c:lerd", &user_name, &crontab_dir);
	argv += optind;

	if (sanitize_env_if_suid()) { /* Clears dangerous stuff, sets PATH */
		/* run by non-root? */
		if (opt_ler & (OPT_u|OPT_c))
			bb_error_msg_and_die("only root can use -c or -u");
	}

	if (opt_ler & OPT_u) {
		pas = getpwnam(user_name);
		if (!pas)
			bb_error_msg_and_die("user %s is not known", user_name);
	} else {
/* XXX: xgetpwuid */
		uid_t my_uid = getuid();
		pas = getpwuid(my_uid);
		if (!pas)
			bb_perror_msg_and_die("unknown uid %d", (int)my_uid);
	}

#define user_name DONT_USE_ME_BEYOND_THIS_POINT

	/* From now on, keep only -l, -e, -r bits */
	opt_ler &= OPT_ler;
	if ((opt_ler - 1) & opt_ler) /* more than one bit set? */
		bb_show_usage();

	/* Read replacement file under user's UID/GID/group vector */
	src_fd = STDIN_FILENO;
	if (!opt_ler) { /* Replace? */
		if (!argv[0])
			bb_show_usage();
		if (NOT_LONE_DASH(argv[0])) {
			src_fd = open_as_user(pas, argv[0]);
			if (src_fd < 0)
				bb_error_msg_and_die("user %s cannot read %s",
						pas->pw_name, argv[0]);
		}
	}

	/* cd to our crontab directory */
	xchdir(crontab_dir);

	tmp_fname = NULL;

	/* Handle requested operation */
	switch (opt_ler) {

	default: /* case OPT_r: Delete */
		unlink(pas->pw_name);
		break;

	case OPT_l: /* List */
		{
			char *args[2] = { pas->pw_name, NULL };
			return bb_cat(args);
			/* list exits,
			 * the rest go play with cron update file */
		}

	case OPT_e: /* Edit */
		tmp_fname = xasprintf("%s.%u", crontab_dir, (unsigned)getpid());
		/* No O_EXCL: we don't want to be stuck if earlier crontabs
		 * were killed, leaving stale temp file behind */
		src_fd = xopen3(tmp_fname, O_RDWR|O_CREAT|O_TRUNC, 0600);
		fchown(src_fd, pas->pw_uid, pas->pw_gid);
		fd = open(pas->pw_name, O_RDONLY);
		if (fd >= 0) {
			bb_copyfd_eof(fd, src_fd);
			close(fd);
			xlseek(src_fd, 0, SEEK_SET);
		}
		close_on_exec_on(src_fd); /* don't want editor to see this fd */
		edit_file(pas, tmp_fname);
		/* fall through */

	case 0: /* Replace (no -l, -e, or -r were given) */
		new_fname = xasprintf("%s.new", pas->pw_name);
		fd = open(new_fname, O_WRONLY|O_CREAT|O_TRUNC|O_APPEND, 0600);
		if (fd >= 0) {
			bb_copyfd_eof(src_fd, fd);
			close(fd);
			xrename(new_fname, pas->pw_name);
		} else {
			bb_error_msg("cannot create %s/%s",
					crontab_dir, new_fname);
		}
		if (tmp_fname)
			unlink(tmp_fname);
		/*free(tmp_fname);*/
		/*free(new_fname);*/

	} /* switch */

	/* Bump notification file.  Handle window where crond picks file up
	 * before we can write our entry out.
	 */
	while ((fd = open(CRONUPDATE, O_WRONLY|O_CREAT|O_APPEND, 0600)) >= 0) {
		struct stat st;

		fdprintf(fd, "%s\n", pas->pw_name);
		if (fstat(fd, &st) != 0 || st.st_nlink != 0) {
			/*close(fd);*/
			break;
		}
		/* st.st_nlink == 0:
		 * file was deleted, maybe crond missed our notification */
		close(fd);
		/* loop */
	}
	if (fd < 0) {
		bb_error_msg("cannot append to %s/%s",
				crontab_dir, CRONUPDATE);
	}
	return 0;
}
コード例 #8
0
ファイル: runsv.c プロジェクト: AlexShiLucky/busybox
int runsv_main(int argc UNUSED_PARAM, char **argv)
{
	struct stat s;
	int fd;
	int r;
	char buf[256];

	INIT_G();

	dir = single_argv(argv);

	xpiped_pair(selfpipe);
	close_on_exec_on(selfpipe.rd);
	close_on_exec_on(selfpipe.wr);
	ndelay_on(selfpipe.rd);
	ndelay_on(selfpipe.wr);

	sig_block(SIGCHLD);
	bb_signals_recursive_norestart(1 << SIGCHLD, s_child);
	sig_block(SIGTERM);
	bb_signals_recursive_norestart(1 << SIGTERM, s_term);

	xchdir(dir);
	/* bss: svd[0].pid = 0; */
	if (S_DOWN) svd[0].state = S_DOWN; /* otherwise already 0 (bss) */
	if (C_NOOP) svd[0].ctrl = C_NOOP;
	if (W_UP) svd[0].sd_want = W_UP;
	/* bss: svd[0].islog = 0; */
	/* bss: svd[1].pid = 0; */
	gettimeofday_ns(&svd[0].start);
	if (stat("down", &s) != -1)
		svd[0].sd_want = W_DOWN;

	if (stat("log", &s) == -1) {
		if (errno != ENOENT)
			warn_cannot("stat ./log");
	} else {
		if (!S_ISDIR(s.st_mode)) {
			errno = 0;
			warn_cannot("stat log/down: log is not a directory");
		} else {
			haslog = 1;
			svd[1].state = S_DOWN;
			svd[1].ctrl = C_NOOP;
			svd[1].sd_want = W_UP;
			svd[1].islog = 1;
			gettimeofday_ns(&svd[1].start);
			if (stat("log/down", &s) != -1)
				svd[1].sd_want = W_DOWN;
			xpiped_pair(logpipe);
			close_on_exec_on(logpipe.rd);
			close_on_exec_on(logpipe.wr);
		}
	}

	if (mkdir("supervise", 0700) == -1) {
		r = readlink("supervise", buf, sizeof(buf));
		if (r != -1) {
			if (r == sizeof(buf))
				fatal2x_cannot("readlink ./supervise", ": name too long");
			buf[r] = 0;
			mkdir(buf, 0700);
		} else {
			if ((errno != ENOENT) && (errno != EINVAL))
				fatal_cannot("readlink ./supervise");
		}
	}
	svd[0].fdlock = xopen3("log/supervise/lock"+4,
			O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
	if (flock(svd[0].fdlock, LOCK_EX | LOCK_NB) == -1)
		fatal_cannot("lock supervise/lock");
	close_on_exec_on(svd[0].fdlock);
	if (haslog) {
		if (mkdir("log/supervise", 0700) == -1) {
			r = readlink("log/supervise", buf, 256);
			if (r != -1) {
				if (r == 256)
					fatal2x_cannot("readlink ./log/supervise", ": name too long");
				buf[r] = 0;
				fd = xopen(".", O_RDONLY|O_NDELAY);
				xchdir("./log");
				mkdir(buf, 0700);
				if (fchdir(fd) == -1)
					fatal_cannot("change back to service directory");
				close(fd);
			}
			else {
				if ((errno != ENOENT) && (errno != EINVAL))
					fatal_cannot("readlink ./log/supervise");
			}
		}
		svd[1].fdlock = xopen3("log/supervise/lock",
				O_WRONLY|O_NDELAY|O_APPEND|O_CREAT, 0600);
		if (flock(svd[1].fdlock, LOCK_EX) == -1)
			fatal_cannot("lock log/supervise/lock");
		close_on_exec_on(svd[1].fdlock);
	}

	mkfifo("log/supervise/control"+4, 0600);
	svd[0].fdcontrol = xopen("log/supervise/control"+4, O_RDONLY|O_NDELAY);
	close_on_exec_on(svd[0].fdcontrol);
	svd[0].fdcontrolwrite = xopen("log/supervise/control"+4, O_WRONLY|O_NDELAY);
	close_on_exec_on(svd[0].fdcontrolwrite);
	update_status(&svd[0]);
	if (haslog) {
		mkfifo("log/supervise/control", 0600);
		svd[1].fdcontrol = xopen("log/supervise/control", O_RDONLY|O_NDELAY);
		close_on_exec_on(svd[1].fdcontrol);
		svd[1].fdcontrolwrite = xopen("log/supervise/control", O_WRONLY|O_NDELAY);
		close_on_exec_on(svd[1].fdcontrolwrite);
		update_status(&svd[1]);
	}
	mkfifo("log/supervise/ok"+4, 0600);
	fd = xopen("log/supervise/ok"+4, O_RDONLY|O_NDELAY);
	close_on_exec_on(fd);
	if (haslog) {
		mkfifo("log/supervise/ok", 0600);
		fd = xopen("log/supervise/ok", O_RDONLY|O_NDELAY);
		close_on_exec_on(fd);
	}
	for (;;) {
		struct pollfd x[3];
		unsigned deadline;
		char ch;

		if (haslog)
			if (!svd[1].pid && svd[1].sd_want == W_UP)
				startservice(&svd[1]);
		if (!svd[0].pid)
			if (svd[0].sd_want == W_UP || svd[0].state == S_FINISH)
				startservice(&svd[0]);

		x[0].fd = selfpipe.rd;
		x[0].events = POLLIN;
		x[1].fd = svd[0].fdcontrol;
		x[1].events = POLLIN;
		/* x[2] is used only if haslog == 1 */
		x[2].fd = svd[1].fdcontrol;
		x[2].events = POLLIN;
		sig_unblock(SIGTERM);
		sig_unblock(SIGCHLD);
		poll(x, 2 + haslog, 3600*1000);
		sig_block(SIGTERM);
		sig_block(SIGCHLD);

		while (read(selfpipe.rd, &ch, 1) == 1)
			continue;

		for (;;) {
			pid_t child;
			int wstat;

			child = wait_any_nohang(&wstat);
			if (!child)
				break;
			if ((child == -1) && (errno != EINTR))
				break;
			if (child == svd[0].pid) {
				svd[0].wstat = wstat;
				svd[0].pid = 0;
				pidchanged = 1;
				svd[0].ctrl &= ~C_TERM;
				if (svd[0].state != S_FINISH) {
					fd = open("finish", O_RDONLY|O_NDELAY);
					if (fd != -1) {
						close(fd);
						svd[0].state = S_FINISH;
						update_status(&svd[0]);
						continue;
					}
				}
				svd[0].state = S_DOWN;
				deadline = svd[0].start.tv_sec + 1;
				gettimeofday_ns(&svd[0].start);
				update_status(&svd[0]);
				if (LESS(svd[0].start.tv_sec, deadline))
					sleep(1);
			}
			if (haslog) {
				if (child == svd[1].pid) {
					svd[0].wstat = wstat;
					svd[1].pid = 0;
					pidchanged = 1;
					svd[1].state = S_DOWN;
					svd[1].ctrl &= ~C_TERM;
					deadline = svd[1].start.tv_sec + 1;
					gettimeofday_ns(&svd[1].start);
					update_status(&svd[1]);
					if (LESS(svd[1].start.tv_sec, deadline))
						sleep(1);
				}
			}
		} /* for (;;) */
		if (read(svd[0].fdcontrol, &ch, 1) == 1)
			ctrl(&svd[0], ch);
		if (haslog)
			if (read(svd[1].fdcontrol, &ch, 1) == 1)
				ctrl(&svd[1], ch);

		if (sigterm) {
			ctrl(&svd[0], 'x');
			sigterm = 0;
		}

		if (svd[0].sd_want == W_EXIT && svd[0].state == S_DOWN) {
			if (svd[1].pid == 0)
				_exit(EXIT_SUCCESS);
			if (svd[1].sd_want != W_EXIT) {
				svd[1].sd_want = W_EXIT;
				/* stopservice(&svd[1]); */
				update_status(&svd[1]);
				close(logpipe.wr);
				close(logpipe.rd);
			}
		}
	} /* for (;;) */
	/* not reached */
	return 0;
}
コード例 #9
0
static int create_and_upload_archive(
                const char *dump_dir_name,
                map_string_t *settings)
{
    int result = 1; /* error */

    pid_t child;
    TAR* tar = NULL;
    const char* errmsg = NULL;
    char* tempfile = NULL;

    struct dump_dir *dd = dd_opendir(dump_dir_name, /*flags:*/ 0);
    if (!dd)
        xfunc_die(); /* error msg is already logged by dd_opendir */

    /* Gzipping e.g. 0.5gig coredump takes a while. Let client know what we are doing */
    log(_("Compressing data"));

//TODO:
//Encrypt = yes
//ArchiveType = .tar.bz2
//ExcludeFiles = foo,bar*,b*z
    const char* opt = getenv("Upload_URL");
    if (!opt)
        opt = get_map_string_item_or_empty(settings, "URL");
    char *url = opt[0] != '\0' ? xstrdup(opt) : ask_url(_("Please enter a URL (scp, ftp, etc.) where the problem data is to be exported:"));

    /* Create a child gzip which will compress the data */
    /* SELinux guys are not happy with /tmp, using /var/run/abrt */
    /* Reverted back to /tmp for ABRT2 */
    /* Changed again to /var/tmp because of Fedora feature tmp-on-tmpfs */
    tempfile = concat_path_basename(LARGE_DATA_TMP_DIR, dump_dir_name);
    tempfile = append_to_malloced_string(tempfile, ".tar.gz");

    int pipe_from_parent_to_child[2];
    xpipe(pipe_from_parent_to_child);
    child = vfork();
    if (child == 0)
    {
        /* child */
        close(pipe_from_parent_to_child[1]);
        xmove_fd(pipe_from_parent_to_child[0], 0);
        xmove_fd(xopen3(tempfile, O_WRONLY | O_CREAT | O_EXCL, 0600), 1);
        execlp("gzip", "gzip", NULL);
        perror_msg_and_die("Can't execute '%s'", "gzip");
    }
    close(pipe_from_parent_to_child[0]);

    /* If child died (say, in xopen), then parent might get SIGPIPE.
     * We want to properly unlock dd, therefore we must not die on SIGPIPE:
     */
    signal(SIGPIPE, SIG_IGN);

    /* Create tar writer object */
    if (tar_fdopen(&tar, pipe_from_parent_to_child[1], tempfile,
                /*fileops:(standard)*/ NULL, O_WRONLY | O_CREAT, 0644, TAR_GNU) != 0)
    {
        errmsg = "Can't create temporary file in "LARGE_DATA_TMP_DIR;
        goto ret;
    }

    /* Write data to the tarball */
    {
        string_vector_ptr_t exclude_from_report = get_global_always_excluded_elements();
        dd_init_next_file(dd);
        char *short_name, *full_name;
        while (dd_get_next_file(dd, &short_name, &full_name))
        {
            if (exclude_from_report && is_in_string_list(short_name, (const_string_vector_const_ptr_t)exclude_from_report))
                goto next;

            // dd_get_next_file guarantees that it's a REG:
            //struct stat stbuf;
            //if (stat(full_name, &stbuf) != 0)
            // || !S_ISREG(stbuf.st_mode)
            //) {
            //     goto next;
            //}
            if (tar_append_file(tar, full_name, short_name) != 0)
            {
                errmsg = "Can't create temporary file in "LARGE_DATA_TMP_DIR;
                free(short_name);
                free(full_name);
                goto ret;
            }
 next:
            free(short_name);
            free(full_name);
        }
    }
    dd_close(dd);
    dd = NULL;

    /* Close tar writer... */
    if (tar_append_eof(tar) != 0 || tar_close(tar) != 0)
    {
        errmsg = "Can't create temporary file in "LARGE_DATA_TMP_DIR;
        goto ret;
    }
    tar = NULL;
    /* ...and check that gzip child finished successfully */
    int status;
    safe_waitpid(child, &status, 0);
    child = -1;
    if (status != 0)
    {
        /* We assume the error was out-of-disk-space or out-of-quota */
        errmsg = "Can't create temporary file in "LARGE_DATA_TMP_DIR;
        goto ret;
    }

    /* Upload the tarball */
    /* Upload from /tmp to /tmp + deletion -> BAD, exclude this possibility */
    if (url && url[0] && strcmp(url, "file://"LARGE_DATA_TMP_DIR"/") != 0)
    {
        post_state_t *state = new_post_state(POST_WANT_ERROR_MSG);
        state->username = getenv("Upload_Username");
        char *password_inp = NULL;
        if (state->username != NULL && state->username[0] != '\0')
        {
            /* Load Password only if Username is configured, it doesn't make */
            /* much sense to load Password without Username. */
            state->password = getenv("Upload_Password");
            if (state->password == NULL)
            {
                /* Be permissive and nice, ask only once and don't check */
                /* the result. User can dismiss this prompt but the upload */
                /* may work somehow??? */
                char *msg = xasprintf(_("Please enter password for uploading:"), state->username);
                state->password = password_inp = ask_password(msg);
                free(msg);
            }
        }

        char *remote_name = upload_file_ext(state, url, tempfile, UPLOAD_FILE_HANDLE_ACCESS_DENIALS);

        result = (remote_name == NULL); /* error if NULL */
        free(remote_name);
        free(password_inp);
        free_post_state(state);
        /* cleanup code will delete tempfile */
    }
    else
    {
        result = 0; /* success */
        log(_("Archive is created: '%s'"), tempfile);
        free(tempfile);
        tempfile = NULL;
    }

 ret:
    free(url);
    dd_close(dd);
    if (tar)
        tar_close(tar);
    /* close(pipe_from_parent_to_child[1]); - tar_close() does it itself */
    if (child > 0)
        safe_waitpid(child, NULL, 0);
    if (tempfile)
    {
        unlink(tempfile);
        free(tempfile);
    }
    if (errmsg)
        error_msg_and_die("%s", errmsg);

    return result;
}
void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
{
	file_header_t *file_header = archive_handle->file_header;
	int dst_fd;
	int res;

#if ENABLE_FEATURE_TAR_SELINUX
	char *sctx = archive_handle->tar__sctx[PAX_NEXT_FILE];
#ifdef __BIONIC__
	matchpathcon_init(NULL);
#endif
	if (!sctx)
		sctx = archive_handle->tar__sctx[PAX_GLOBAL];
	if (sctx) { /* setfscreatecon is 4 syscalls, avoid if possible */
		setfscreatecon(sctx);
		free(archive_handle->tar__sctx[PAX_NEXT_FILE]);
		archive_handle->tar__sctx[PAX_NEXT_FILE] = NULL;
	}
#endif

	if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
		char *slash = strrchr(file_header->name, '/');
		if (slash) {
			*slash = '\0';
			bb_make_directory(file_header->name, -1, FILEUTILS_RECUR);
			*slash = '/';
		}
	}

	if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
		/* Remove the entry if it exists */
		if (!S_ISDIR(file_header->mode)) {
			/* Is it hardlink?
			 * We encode hard links as regular files of size 0 with a symlink */
			if (S_ISREG(file_header->mode)
			 && file_header->link_target
			 && file_header->size == 0
			) {
				/* Ugly special case:
				 * tar cf t.tar hardlink1 hardlink2 hardlink1
				 * results in this tarball structure:
				 * hardlink1
				 * hardlink2 -> hardlink1
				 * hardlink1 -> hardlink1 <== !!!
				 */
				if (strcmp(file_header->link_target, file_header->name) == 0)
					goto ret;
			}
			/* Proceed with deleting */
			if (unlink(file_header->name) == -1
			 && errno != ENOENT
			) {
				bb_perror_msg_and_die("can't remove old file %s",
						file_header->name);
			}
		}
	}
	else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
		/* Remove the existing entry if its older than the extracted entry */
		struct stat existing_sb;
		if (lstat(file_header->name, &existing_sb) == -1) {
			if (errno != ENOENT) {
				bb_perror_msg_and_die("can't stat old file");
			}
		}
		else if ((time_t) existing_sb.st_mtime >= (time_t) file_header->mtime) {
			if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
			 && !S_ISDIR(file_header->mode)
			) {
				bb_error_msg("%s not created: newer or "
					"same age file exists", file_header->name);
			}
			data_skip(archive_handle);
			goto ret;
		}
		else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
			bb_perror_msg_and_die("can't remove old file %s",
					file_header->name);
		}
	}

	/* Handle hard links separately
	 * We encode hard links as regular files of size 0 with a symlink */
	if (S_ISREG(file_header->mode)
	 && file_header->link_target
	 && file_header->size == 0
	) {
		/* hard link */
		res = link(file_header->link_target, file_header->name);
		if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
			bb_perror_msg("can't create %slink "
					"from %s to %s", "hard",
					file_header->name,
					file_header->link_target);
		}
		/* Hardlinks have no separate mode/ownership, skip chown/chmod */
		goto ret;
	}

	/* Create the filesystem entry */
	switch (file_header->mode & S_IFMT) {
	case S_IFREG: {
		/* Regular file */
		char *dst_name;
		int flags = O_WRONLY | O_CREAT | O_EXCL;
		if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
			flags = O_WRONLY | O_CREAT | O_TRUNC;
		dst_name = file_header->name;
#ifdef ARCHIVE_REPLACE_VIA_RENAME
		if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME)
			/* rpm-style temp file name */
			dst_name = xasprintf("%s;%x", dst_name, (int)getpid());
#endif
		dst_fd = xopen3(dst_name,
			flags,
			file_header->mode
			);
		bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
		close(dst_fd);
#ifdef ARCHIVE_REPLACE_VIA_RENAME
		if (archive_handle->ah_flags & ARCHIVE_REPLACE_VIA_RENAME) {
			xrename(dst_name, file_header->name);
			free(dst_name);
		}
#endif
		break;
	}
	case S_IFDIR:
		res = mkdir(file_header->name, file_header->mode);
		if ((res == -1)
		 && (errno != EISDIR) /* btw, Linux doesn't return this */
		 && (errno != EEXIST)
		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
		) {
			bb_perror_msg("can't make dir %s", file_header->name);
		}
		break;
	case S_IFLNK:
		/* Symlink */
//TODO: what if file_header->link_target == NULL (say, corrupted tarball?)
		res = symlink(file_header->link_target, file_header->name);
		if ((res == -1)
		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
		) {
			bb_perror_msg("can't create %slink "
				"from %s to %s", "sym",
				file_header->name,
				file_header->link_target);
		}
		break;
	case S_IFSOCK:
	case S_IFBLK:
	case S_IFCHR:
	case S_IFIFO:
		res = mknod(file_header->name, file_header->mode, file_header->device);
		if ((res == -1)
		 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
		) {
			bb_perror_msg("can't create node %s", file_header->name);
		}
		break;
	default:
		bb_error_msg_and_die("unrecognized file type");
	}

	if (!S_ISLNK(file_header->mode)) {
		if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) {
			uid_t uid = file_header->uid;
			gid_t gid = file_header->gid;
#if ENABLE_FEATURE_TAR_UNAME_GNAME
			if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
				if (file_header->tar__uname) {
//TODO: cache last name/id pair?
					struct passwd *pwd = getpwnam(file_header->tar__uname);
					if (pwd) uid = pwd->pw_uid;
				}
				if (file_header->tar__gname) {
					struct group *grp = getgrnam(file_header->tar__gname);
					if (grp) gid = grp->gr_gid;
				}
			}
#endif
			/* GNU tar 1.15.1 uses chown, not lchown */
			chown(file_header->name, uid, gid);
		}
		/* uclibc has no lchmod, glibc is even stranger -
		 * it has lchmod which seems to do nothing!
		 * so we use chmod... */
		if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
			chmod(file_header->name, file_header->mode);
		}
		if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
			struct timeval t[2];

			t[1].tv_sec = t[0].tv_sec = file_header->mtime;
			t[1].tv_usec = t[0].tv_usec = 0;
			utimes(file_header->name, t);
		}
	}

 ret: ;
#if ENABLE_FEATURE_TAR_SELINUX
	if (sctx) {
		/* reset the context after creating an entry */
		setfscreatecon(NULL);
	}
#endif
}
コード例 #11
0
ファイル: crontab.c プロジェクト: emuikernel/WNR2000v4
int crontab_main(int ac, char **av)
{
	enum { NONE, EDIT, LIST, REPLACE, DELETE } option = NONE;
	const struct passwd *pas;
	const char *repFile = NULL;
	int repFd = 0;
	int i;
	char caller[256];           /* user that ran program */
	char buf[1024];
	int UserId;

	UserId = getuid();
	pas = getpwuid(UserId);
	if (pas == NULL)
		bb_perror_msg_and_die("getpwuid");

	safe_strncpy(caller, pas->pw_name, sizeof(caller));

	i = 1;
	if (ac > 1) {
		if (LONE_DASH(av[1])) {
			option = REPLACE;
			++i;
		} else if (av[1][0] != '-') {
			option = REPLACE;
			++i;
			repFile = av[1];
		}
	}

	for (; i < ac; ++i) {
		char *ptr = av[i];

		if (*ptr != '-')
			break;
		ptr += 2;

		switch (ptr[-1]) {
		case 'l':
			if (ptr[-1] == 'l')
				option = LIST;
			/* fall through */
		case 'e':
			if (ptr[-1] == 'e')
				option = EDIT;
			/* fall through */
		case 'd':
			if (ptr[-1] == 'd')
				option = DELETE;
			/* fall through */
		case 'u':
			if (i + 1 < ac && av[i+1][0] != '-') {
				++i;
				if (getuid() == geteuid()) {
					pas = getpwnam(av[i]);
					if (pas) {
						UserId = pas->pw_uid;
					} else {
						bb_error_msg_and_die("user %s unknown", av[i]);
					}
				} else {
					bb_error_msg_and_die("only the superuser may specify a user");
				}
			}
			break;
		case 'c':
			if (getuid() == geteuid()) {
				CDir = (*ptr) ? ptr : av[++i];
			} else {
				bb_error_msg_and_die("-c option: superuser only");
			}
			break;
		default:
			i = ac;
			break;
		}
	}
	if (i != ac || option == NONE)
		bb_show_usage();

	/*
	 * Get password entry
	 */

	pas = getpwuid(UserId);
	if (pas == NULL)
		bb_perror_msg_and_die("getpwuid");

	/*
	 * If there is a replacement file, obtain a secure descriptor to it.
	 */

	if (repFile) {
		repFd = GetReplaceStream(caller, repFile);
		if (repFd < 0)
			bb_error_msg_and_die("cannot read replacement file");
	}

	/*
	 * Change directory to our crontab directory
	 */

	xchdir(CDir);

	/*
	 * Handle options as appropriate
	 */

	switch (option) {
	case LIST:
		{
			FILE *fi;

			fi = fopen(pas->pw_name, "r");
			if (fi) {
				while (fgets(buf, sizeof(buf), fi) != NULL)
					fputs(buf, stdout);
				fclose(fi);
			} else {
				bb_error_msg("no crontab for %s", pas->pw_name);
			}
		}
		break;
	case EDIT:
		{
/* FIXME: messy code here! we have file copying helpers for this! */
			FILE *fi;
			int fd;
			int n;
			char tmp[128];

			snprintf(tmp, sizeof(tmp), TMPDIR "/crontab.%d", getpid());
			fd = xopen3(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600);
/* race, use fchown */
			chown(tmp, getuid(), getgid());
			fi = fopen(pas->pw_name, "r");
			if (fi) {
				while ((n = fread(buf, 1, sizeof(buf), fi)) > 0)
					full_write(fd, buf, n);
			}
			EditFile(caller, tmp);
			remove(tmp);
			lseek(fd, 0L, SEEK_SET);
			repFd = fd;
		}
		option = REPLACE;
		/* fall through */
	case REPLACE:
		{
/* same here */
			char path[1024];
			int fd;
			int n;

			snprintf(path, sizeof(path), "%s.new", pas->pw_name);
			fd = open(path, O_CREAT|O_TRUNC|O_APPEND|O_WRONLY, 0600);
			if (fd >= 0) {
				while ((n = read(repFd, buf, sizeof(buf))) > 0) {
					full_write(fd, buf, n);
				}
				close(fd);
				rename(path, pas->pw_name);
			} else {
				bb_error_msg("cannot create %s/%s", CDir, path);
			}
			close(repFd);
		}
		break;
	case DELETE:
		remove(pas->pw_name);
		break;
	case NONE:
	default:
		break;
	}

	/*
	 *  Bump notification file.  Handle window where crond picks file up
	 *  before we can write our entry out.
	 */

	if (option == REPLACE || option == DELETE) {
		FILE *fo;
		struct stat st;

		while ((fo = fopen(CRONUPDATE, "a"))) {
			fprintf(fo, "%s\n", pas->pw_name);
			fflush(fo);
			if (fstat(fileno(fo), &st) != 0 || st.st_nlink != 0) {
				fclose(fo);
				break;
			}
			fclose(fo);
			/* loop */
		}
		if (fo == NULL) {
			bb_error_msg("cannot append to %s/%s", CDir, CRONUPDATE);
		}
	}
	return 0;
}
コード例 #12
0
int sort_main(int argc UNUSED_PARAM, char **argv)
{
	char *line, **lines;
	char *str_ignored, *str_o, *str_t;
	llist_t *lst_k = NULL;
	int i, flag;
	int linecount;
	unsigned opts;

	xfunc_error_retval = 2;

	/* Parse command line options */
	/* -o and -t can be given at most once */
	opt_complementary = "o--o:t--t:" /* -t, -o: at most one of each */
			"k::"; /* -k takes list */
	opts = getopt32(argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
	/* global b strips leading and trailing spaces */
	if (opts & FLAG_b)
		option_mask32 |= FLAG_bb;
#if ENABLE_FEATURE_SORT_BIG
	if (opts & FLAG_t) {
		if (!str_t[0] || str_t[1])
			bb_error_msg_and_die("bad -t parameter");
		key_separator = str_t[0];
	}
	/* note: below this point we use option_mask32, not opts,
	 * since that reduces register pressure and makes code smaller */

	/* parse sort key */
	while (lst_k) {
		enum {
			FLAG_allowed_for_k =
				FLAG_n | /* Numeric sort */
				FLAG_g | /* Sort using strtod() */
				FLAG_M | /* Sort date */
				FLAG_b | /* Ignore leading blanks */
				FLAG_r | /* Reverse */
				FLAG_d | /* Ignore !(isalnum()|isspace()) */
				FLAG_f | /* Force uppercase */
				FLAG_i | /* Ignore !isprint() */
			0
		};
		struct sort_key *key = add_key();
		char *str_k = llist_pop(&lst_k);

		i = 0; /* i==0 before comma, 1 after (-k3,6) */
		while (*str_k) {
			/* Start of range */
			/* Cannot use bb_strtou - suffix can be a letter */
			key->range[2*i] = str2u(&str_k);
			if (*str_k == '.') {
				str_k++;
				key->range[2*i+1] = str2u(&str_k);
			}
			while (*str_k) {
				const char *temp2;

				if (*str_k == ',' && !i++) {
					str_k++;
					break;
				} /* no else needed: fall through to syntax error
					because comma isn't in OPT_STR */
				temp2 = strchr(OPT_STR, *str_k);
				if (!temp2)
					bb_error_msg_and_die("unknown key option");
				flag = 1 << (temp2 - OPT_STR);
				if (flag & ~FLAG_allowed_for_k)
					bb_error_msg_and_die("unknown sort type");
				/* b after ',' means strip _trailing_ space */
				if (i && flag == FLAG_b)
					flag = FLAG_bb;
				key->flags |= flag;
				str_k++;
			}
		}
	}
#endif

	/* Open input files and read data */
	argv += optind;
	if (!*argv)
		*--argv = (char*)"-";
	linecount = 0;
	lines = NULL;
	do {
		/* coreutils 6.9 compat: abort on first open error,
		 * do not continue to next file: */
		FILE *fp = xfopen_stdin(*argv);
		for (;;) {
			line = GET_LINE(fp);
			if (!line)
				break;
			lines = xrealloc_vector(lines, 6, linecount);
			lines[linecount++] = line;
		}
		fclose_if_not_stdin(fp);
	} while (*++argv);

#if ENABLE_FEATURE_SORT_BIG
	/* if no key, perform alphabetic sort */
	if (!key_list)
		add_key()->range[0] = 1;
	/* handle -c */
	if (option_mask32 & FLAG_c) {
		int j = (option_mask32 & FLAG_u) ? -1 : 0;
		for (i = 1; i < linecount; i++) {
			if (compare_keys(&lines[i-1], &lines[i]) > j) {
				fprintf(stderr, "Check line %u\n", i);
				return EXIT_FAILURE;
			}
		}
		return EXIT_SUCCESS;
	}
#endif
	/* Perform the actual sort */
	qsort(lines, linecount, sizeof(lines[0]), compare_keys);
	/* handle -u */
	if (option_mask32 & FLAG_u) {
		flag = 0;
		/* coreutils 6.3 drop lines for which only key is the same */
		/* -- disabling last-resort compare... */
		option_mask32 |= FLAG_s;
		for (i = 1; i < linecount; i++) {
			if (compare_keys(&lines[flag], &lines[i]) == 0)
				free(lines[i]);
			else
				lines[++flag] = lines[i];
		}
		if (linecount)
			linecount = flag+1;
	}

	/* Print it */
#if ENABLE_FEATURE_SORT_BIG
	/* Open output file _after_ we read all input ones */
	if (option_mask32 & FLAG_o)
		xmove_fd(xopen3(str_o, O_WRONLY|O_CREAT|O_TRUNC, 0666), STDOUT_FILENO);
#endif
	flag = (option_mask32 & FLAG_z) ? '\0' : '\n';
	for (i = 0; i < linecount; i++)
		printf("%s%c", lines[i], flag);

	fflush_stdout_and_exit(EXIT_SUCCESS);
}
コード例 #13
0
void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
{
	file_header_t *file_header = archive_handle->file_header;
	int dst_fd;
	int res;

	if (archive_handle->ah_flags & ARCHIVE_CREATE_LEADING_DIRS) {
		char *slash = strrchr(file_header->name, '/');
		if (slash) {
			*slash = '\0';
			bb_make_directory(file_header->name, -1, FILEUTILS_RECUR);
			*slash = '/';
		}
	}

	if (archive_handle->ah_flags & ARCHIVE_UNLINK_OLD) {
		/* Remove the entry if it exists */
		if ((!S_ISDIR(file_header->mode))
		 && (unlink(file_header->name) == -1)
		 && (errno != ENOENT)
		) {
			bb_perror_msg_and_die("can't remove old file %s",
					file_header->name);
		}
	}
	else if (archive_handle->ah_flags & ARCHIVE_EXTRACT_NEWER) {
		/* Remove the existing entry if its older than the extracted entry */
		struct stat existing_sb;
		if (lstat(file_header->name, &existing_sb) == -1) {
			if (errno != ENOENT) {
				bb_perror_msg_and_die("can't stat old file");
			}
		}
		else if (existing_sb.st_mtime >= file_header->mtime) {
			if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
				bb_error_msg("%s not created: newer or "
					"same age file exists", file_header->name);
			}
			data_skip(archive_handle);
			return;
		}
		else if ((unlink(file_header->name) == -1) && (errno != EISDIR)) {
			bb_perror_msg_and_die("can't remove old file %s",
					file_header->name);
		}
	}

	/* Handle hard links separately
	 * We identified hard links as regular files of size 0 with a symlink */
	if (S_ISREG(file_header->mode)
	 && file_header->link_target
	 && file_header->size == 0
	) {
		/* hard link */
		res = link(file_header->link_target, file_header->name);
		if ((res == -1) && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
			bb_perror_msg("can't create %slink "
					"from %s to %s", "hard",
					file_header->name,
					file_header->link_target);
		}
	} else {
		/* Create the filesystem entry */
		switch (file_header->mode & S_IFMT) {
		case S_IFREG: {
			/* Regular file */
			int flags = O_WRONLY | O_CREAT | O_EXCL;
			if (archive_handle->ah_flags & ARCHIVE_O_TRUNC)
				flags = O_WRONLY | O_CREAT | O_TRUNC;
			dst_fd = xopen3(file_header->name,
				flags,
				file_header->mode
				);
			bb_copyfd_exact_size(archive_handle->src_fd, dst_fd, file_header->size);
			close(dst_fd);
			break;
		}
		case S_IFDIR:
			res = mkdir(file_header->name, file_header->mode);
			if ((res == -1)
			 && (errno != EISDIR) /* btw, Linux doesn't return this */
			 && (errno != EEXIST)
			 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("can't make dir %s", file_header->name);
			}
			break;
		case S_IFLNK:
			/* Symlink */
			res = symlink(file_header->link_target, file_header->name);
			if ((res == -1)
			 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("can't create %slink "
					"from %s to %s", "sym",
					file_header->name,
					file_header->link_target);
			}
			break;
		case S_IFSOCK:
		case S_IFBLK:
		case S_IFCHR:
		case S_IFIFO:
			res = mknod(file_header->name, file_header->mode, file_header->device);
			if ((res == -1)
			 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
			) {
				bb_perror_msg("can't create node %s", file_header->name);
			}
			break;
		default:
			bb_error_msg_and_die("unrecognized file type");
		}
	}

	if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_OWNER)) {
#if ENABLE_FEATURE_TAR_UNAME_GNAME
		if (!(archive_handle->ah_flags & ARCHIVE_NUMERIC_OWNER)) {
			uid_t uid = file_header->uid;
			gid_t gid = file_header->gid;

			if (file_header->tar__uname) {
//TODO: cache last name/id pair?
				struct passwd *pwd = getpwnam(file_header->tar__uname);
				if (pwd) uid = pwd->pw_uid;
			}
			if (file_header->tar__gname) {
				struct group *grp = getgrnam(file_header->tar__gname);
				if (grp) gid = grp->gr_gid;
			}
			/* GNU tar 1.15.1 uses chown, not lchown */
			chown(file_header->name, uid, gid);
		} else
#endif
			chown(file_header->name, file_header->uid, file_header->gid);
	}
	if (!S_ISLNK(file_header->mode)) {
		/* uclibc has no lchmod, glibc is even stranger -
		 * it has lchmod which seems to do nothing!
		 * so we use chmod... */
		if (!(archive_handle->ah_flags & ARCHIVE_DONT_RESTORE_PERM)) {
			chmod(file_header->name, file_header->mode);
		}
		/* same for utime */
		if (archive_handle->ah_flags & ARCHIVE_RESTORE_DATE) {
			struct timeval t[2];

			t[1].tv_sec = t[0].tv_sec = file_header->mtime;
			t[1].tv_usec = t[0].tv_usec = 0;
			utimes(file_header->name, t);
		}
	}
}