New utilities: xbps-{install,pkgdb,query,reconfigure,rindex} (WIP).

bin/xbps-pkgdb/check_pkg_symlinks.c

@@ -0,0 +1,123 @@
+/*-
+ * Copyright (c) 2011-2012 Juan Romero Pardines.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+#include <unistd.h>
+#include <libgen.h>
+#include <sys/param.h>
+
+#include <xbps_api.h>
+#include "defs.h"
+
+/*
+ * Checks package integrity of an installed package.
+ * The following task is accomplished in this file:
+ *
+ * 	o Check for target file in symlinks, so that we can check that
+ * 	  they have not been modified.
+ *
+ * returns 0 if test ran successfully, 1 otherwise and -1 on error.
+ */
+int
+check_pkg_symlinks(struct xbps_handle *xhp,
+		   const char *pkgname,
+		   void *arg,
+		   bool *pkgdb_update)
+{
+	prop_array_t array;
+	prop_object_t obj;
+	prop_object_iterator_t iter;
+	prop_dictionary_t pkg_filesd = arg;
+	const char *file, *tgt = NULL;
+	char *path, *buf, *buf2, *buf3, *dname, *path_target;
+	bool broken = false, test_broken = false;
+
+	(void)pkgdb_update;
+
+	array = prop_dictionary_get(pkg_filesd, "links");
+	if ((prop_object_type(array) == PROP_TYPE_ARRAY) &&
+	     prop_array_count(array) > 0) {
+		iter = xbps_array_iter_from_dict(pkg_filesd, "links");
+		if (iter == NULL)
+			return -1;
+
+		while ((obj = prop_object_iterator_next(iter))) {
+			if (!prop_dictionary_get_cstring_nocopy(obj, "target", &tgt))
+				continue;
+			prop_dictionary_get_cstring_nocopy(obj, "file", &file);
+			if (strcmp(tgt, "") == 0) {
+				xbps_warn_printf("%s: `%s' symlink with "
+				    "empty target object!\n", pkgname, file);
+				continue;
+			}
+			path = xbps_xasprintf("%s/%s", xhp->rootdir, file);
+			if (path == NULL)
+				return -1;
+
+			if ((buf = realpath(path, NULL)) == NULL) {
+				xbps_error_printf("%s: broken symlink `%s': "
+				    "%s\n", pkgname, file, strerror(errno));
+				test_broken = true;
+				continue;
+			}
+			if (strncmp(tgt, "../", 3) == 0) {
+				/* relative symlink target */
+				dname = dirname(path);
+				buf2 = xbps_xasprintf("%s/%s", dname, tgt);
+				assert(buf2);
+				buf3 = realpath(buf2, NULL);
+				assert(buf3);
+				free(buf2);
+				path_target = buf3;
+			} else {
+				path_target = buf;
+			}
+			if (strcmp(buf, path_target)) {
+				xbps_error_printf("%s: modified symlink `%s' "
+				    "points to: `%s' (shall be: `%s')\n",
+				    pkgname, file, buf, path_target);
+				test_broken = true;
+			}
+			free(buf);
+			free(path);
+			if (buf3)
+				free(buf3);
+
+			path = buf = buf2 = buf3 = NULL;
+
+		}
+		prop_object_iterator_release(iter);
+	}
+        if (test_broken) {
+		xbps_error_printf("%s: symlinks check FAILED.\n", pkgname);
+		broken = true;
+	}
+	return broken;
+}