busybox/coreutils/install.c

/* vi: set sw=4 ts=4: */
/*
 * Copyright (C) 2003 by Glenn McGrath <bug1@iinet.net.au>
 * SELinux support: by Yuichi Nakamura <ynakam@hitachisoft.jp>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * TODO: -d option, need a way of recursively making directories and changing
 *           owner/group, will probably modify bb_make_directory(...)
 */

#include "busybox.h"
#include "libcoreutils/coreutils.h"
#include <libgen.h>
#include <getopt.h> /* struct option */

#if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
static const struct option install_long_options[] = {
	{ "directory",           0, NULL, 'd' },
	{ "preserve-timestamps", 0, NULL, 'p' },
	{ "strip",               0, NULL, 's' },
	{ "group",               0, NULL, 'g' },
	{ "mode",                0, NULL, 'm' },
	{ "owner",               0, NULL, 'o' },
#if ENABLE_SELINUX
	{ "context",             1, NULL, 'Z' },
	{ "preserve_context",    0, NULL, 0xff },
	{ "preserve-context",    0, NULL, 0xff },
#endif
	{ 0, 0, 0, 0 }
};
#endif


#if ENABLE_SELINUX
static bool use_default_selinux_context = 1;

static void setdefaultfilecon(const char *path) {
	struct stat s;
	security_context_t scontext = NULL;

	if (!is_selinux_enabled()) {
		return;
	}	
	if (lstat(path, &s) != 0) {
		return;
	}

	if (matchpathcon(path, s.st_mode, &scontext) < 0) {
		goto out;
	}
	if (strcmp(scontext, "<<none>>") == 0) {
		goto out;
	}

	if (lsetfilecon(path, scontext) < 0) {
		if (errno != ENOTSUP) {
			bb_perror_msg("warning: failed to change context of %s to %s", path, scontext);
		}
	}

 out:
	freecon(scontext);
}

#endif

int install_main(int argc, char **argv);
int install_main(int argc, char **argv)
{
	struct stat statbuf;
	mode_t mode;
	uid_t uid;
	gid_t gid;
	const char *gid_str;
	const char *uid_str;
	const char *mode_str;
	int copy_flags = FILEUTILS_DEREFERENCE | FILEUTILS_FORCE;
	int ret = EXIT_SUCCESS, flags, i, isdir;
#if ENABLE_SELINUX
	security_context_t scontext;
#endif
	enum {
		OPT_CMD           =  0x1,
		OPT_DIRECTORY     =  0x2,
		OPT_PRESERVE_TIME =  0x4,
		OPT_STRIP         =  0x8,
		OPT_GROUP         = 0x10,
		OPT_MODE          = 0x20,
		OPT_OWNER         = 0x40,
#if ENABLE_SELINUX
		OPT_SET_SECURITY_CONTEXT = 0x80,
		OPT_PRESERVE_SECURITY_CONTEXT = 0x100,
#endif
	};

#if ENABLE_FEATURE_INSTALL_LONG_OPTIONS
	applet_long_options = install_long_options;
#endif
	opt_complementary = "?:s--d:d--s" USE_SELINUX(":Z--\xff:\xff--Z");
	/* -c exists for backwards compatibility, it's needed */

	flags = getopt32(argc, argv, "cdpsg:m:o:" USE_SELINUX("Z:"), &gid_str, &mode_str, &uid_str USE_SELINUX(, &scontext));
	
#if ENABLE_SELINUX
	if (flags & OPT_PRESERVE_SECURITY_CONTEXT) {
		use_default_selinux_context = 0;
		copy_flags |= FILEUTILS_PRESERVE_SECURITY_CONTEXT;
		selinux_or_die();
	}
	if (flags & OPT_SET_SECURITY_CONTEXT) {
		selinux_or_die();
		if (setfscreatecon(scontext) < 0) {
			bb_error_msg_and_die("setfscreatecon(%s)", scontext); // perror?
		}
		use_default_selinux_context = 0;
		copy_flags |= FILEUTILS_SET_SECURITY_CONTEXT;
	}
#endif

	/* preserve access and modification time, this is GNU behaviour, BSD only preserves modification time */
	if (flags & OPT_PRESERVE_TIME) {
		copy_flags |= FILEUTILS_PRESERVE_STATUS;
	}
	mode = 0666;
	if (flags & OPT_MODE) bb_parse_mode(mode_str, &mode);
	uid = (flags & OPT_OWNER) ? get_ug_id(uid_str, xuname2uid) : getuid();
	gid = (flags & OPT_GROUP) ? get_ug_id(gid_str, xgroup2gid) : getgid();
	if (flags & (OPT_OWNER|OPT_GROUP)) umask(0);

	/* Create directories
	 * don't use bb_make_directory() as it can't change uid or gid
	 * perhaps bb_make_directory() should be improved.
	 */
	if (flags & OPT_DIRECTORY) {
		for (argv += optind; *argv; argv++) {
			char *old_argv_ptr = *argv + 1;
			char *argv_ptr;
			do {
				argv_ptr = strchr(old_argv_ptr, '/');
				old_argv_ptr = argv_ptr;
				if (argv_ptr) {
					*argv_ptr = '\0';
					old_argv_ptr++;
				}
				if (mkdir(*argv, mode | 0111) == -1) {
					if (errno != EEXIST) {
						bb_perror_msg("cannot create %s", *argv);
						ret = EXIT_FAILURE;
						break;
					}
				}
				if ((flags & (OPT_OWNER|OPT_GROUP))
				 && lchown(*argv, uid, gid) == -1
				) {
					bb_perror_msg("cannot change ownership of %s", *argv);
					ret = EXIT_FAILURE;
					break;
				}
				if (argv_ptr) {
					*argv_ptr = '/';
				}
			} while (old_argv_ptr);
		}
		return ret;
	}

	isdir = lstat(argv[argc - 1], &statbuf) < 0 ? 0 : S_ISDIR(statbuf.st_mode);

	for (i = optind; i < argc - 1; i++) {
		char *dest;

		dest = argv[argc - 1];
		if (isdir)
			dest = concat_path_file(argv[argc - 1], basename(argv[i]));
		ret |= copy_file(argv[i], dest, copy_flags);

		/* Set the file mode */
		if ((flags & OPT_MODE) && chmod(dest, mode) == -1) {
			bb_perror_msg("cannot change permissions of %s", dest);
			ret = EXIT_FAILURE;
		}
#if ENABLE_SELINUX
		if (use_default_selinux_context)
			setdefaultfilecon(dest);
#endif
		/* Set the user and group id */
		if ((flags & (OPT_OWNER|OPT_GROUP))
		 && lchown(dest, uid, gid) == -1
		) {
			bb_perror_msg("cannot change ownership of %s", dest);
			ret = EXIT_FAILURE;
		}
		if (flags & OPT_STRIP) {
			if (BB_EXECLP("strip", "strip", dest, NULL) == -1) {
				bb_perror_msg("strip");
				ret = EXIT_FAILURE;
			}
		}
		if (ENABLE_FEATURE_CLEAN_UP && isdir) free(dest);
	}

	return ret;
}