X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=src%2Fconf.c;h=7cf923bc88b087c1c9da0821146780a305977379;hb=4c57e6902219ecca1872e18e34365d8e54a0f407;hp=9e93c9a168a511b886fc2edbbddaaeddcfd5e362;hpb=fa05f996c5500c056a36c1d43e33a407f876643c;p=meshlink

diff --git a/src/conf.c b/src/conf.c
index 9e93c9a1..7cf923bc 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -19,6 +19,8 @@
 
 #include "system.h"
 #include <assert.h>
+#include <sys/types.h>
+#include <utime.h>
 
 #include "conf.h"
 #include "crypto.h"
@@ -28,27 +30,48 @@
 #include "packmsg.h"
 
 /// Generate a path to the main configuration file.
-static void make_main_path(meshlink_handle_t *mesh, char *path, size_t len) {
-	snprintf(path, len, "%s" SLASH "meshlink.conf", mesh->confbase);
+static void make_main_path(meshlink_handle_t *mesh, const char *conf_subdir, char *path, size_t len) {
+	assert(conf_subdir);
+	assert(path);
+	assert(len);
+
+	snprintf(path, len, "%s" SLASH "%s" SLASH "meshlink.conf", mesh->confbase, conf_subdir);
 }
 
 /// Generate a path to a host configuration file.
-static void make_host_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
-	snprintf(path, len, "%s" SLASH "hosts" SLASH "%s", mesh->confbase, name);
+static void make_host_path(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, char *path, size_t len) {
+	assert(conf_subdir);
+	assert(name);
+	assert(path);
+	assert(len);
+
+	snprintf(path, len, "%s" SLASH "%s" SLASH "hosts" SLASH "%s", mesh->confbase, conf_subdir, name);
 }
 
 /// Generate a path to an unused invitation file.
-static void make_invitation_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
-	snprintf(path, len, "%s" SLASH "invitations" SLASH "%s", mesh->confbase, name);
+static void make_invitation_path(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, char *path, size_t len) {
+	assert(conf_subdir);
+	assert(name);
+	assert(path);
+	assert(len);
+
+	snprintf(path, len, "%s" SLASH "%s" SLASH "invitations" SLASH "%s", mesh->confbase, conf_subdir, name);
 }
 
 /// Generate a path to a used invitation file.
-static void make_used_invitation_path(meshlink_handle_t *mesh, const char *name, char *path, size_t len) {
-	snprintf(path, len, "%s" SLASH "invitations" SLASH "%s.used", mesh->confbase, name);
+static void make_used_invitation_path(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, char *path, size_t len) {
+	assert(conf_subdir);
+	assert(name);
+	assert(path);
+	assert(len);
+
+	snprintf(path, len, "%s" SLASH "%s" SLASH "invitations" SLASH "%s.used", mesh->confbase, conf_subdir, name);
 }
 
 /// Remove a directory recursively
-static void deltree(const char *dirname) {
+static bool deltree(const char *dirname) {
+	assert(dirname);
+
 	DIR *d = opendir(dirname);
 
 	if(d) {
@@ -63,43 +86,102 @@ static void deltree(const char *dirname) {
 			snprintf(filename, sizeof(filename), "%s" SLASH "%s", dirname, ent->d_name);
 
 			if(unlink(filename)) {
-				deltree(filename);
+				if(!deltree(filename)) {
+					return false;
+				}
 			}
 		}
 
 		closedir(d);
+	} else {
+		return errno == ENOENT;
 	}
 
-	rmdir(dirname);
+	return rmdir(dirname) == 0;
 }
 
-/// Create a fresh configuration directory
-bool config_init(meshlink_handle_t *mesh) {
-	if(mkdir(mesh->confbase, 0700) && errno != EEXIST) {
-		logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", mesh->confbase, strerror(errno));
+bool sync_path(const char *pathname) {
+	assert(pathname);
+
+	int fd = open(pathname, O_RDONLY);
+
+	if(fd < 0) {
+		logger(NULL, MESHLINK_ERROR, "Failed to open %s: %s\n", pathname, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
 		return false;
 	}
 
+	if(fsync(fd)) {
+		logger(NULL, MESHLINK_ERROR, "Failed to sync %s: %s\n", pathname, strerror(errno));
+		close(fd);
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	if(close(fd)) {
+		logger(NULL, MESHLINK_ERROR, "Failed to close %s: %s\n", pathname, strerror(errno));
+		close(fd);
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	return true;
+}
+
+/// Try decrypting the main configuration file from the given sub-directory.
+static bool main_config_decrypt(meshlink_handle_t *mesh, const char *conf_subdir) {
+	assert(mesh->config_key);
+	assert(mesh->confbase);
+	assert(conf_subdir);
+
+	config_t config;
+
+	if(!main_config_read(mesh, conf_subdir, &config, mesh->config_key)) {
+		logger(mesh, MESHLINK_ERROR, "Could not read main configuration file");
+		return false;
+	}
+
+	packmsg_input_t in = {config.buf, config.len};
+
+	uint32_t version = packmsg_get_uint32(&in);
+	config_free(&config);
+
+	return version == MESHLINK_CONFIG_VERSION;
+}
+
+/// Create a fresh configuration directory
+bool config_init(meshlink_handle_t *mesh, const char *conf_subdir) {
+	assert(conf_subdir);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
 	char path[PATH_MAX];
 
-	// Remove meshlink.conf
-	snprintf(path, sizeof(path), "%s" SLASH "meshlink.conf", mesh->confbase);
-	unlink(path);
+	// Create "current" sub-directory in the confbase
+	snprintf(path, sizeof(path), "%s" SLASH "%s", mesh->confbase, conf_subdir);
+
+	if(!deltree(path)) {
+		logger(mesh, MESHLINK_DEBUG, "Could not delete directory %s: %s\n", path, strerror(errno));
+		return false;
+	}
+
+	if(mkdir(path, 0700)) {
+		logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", path, strerror(errno));
+		return false;
+	}
 
-	// Remove any host config files
-	snprintf(path, sizeof(path), "%s" SLASH "hosts", mesh->confbase);
-	deltree(path);
+	make_host_path(mesh, conf_subdir, "", path, sizeof(path));
 
-	if(mkdir(path, 0700) && errno != EEXIST) {
+	if(mkdir(path, 0700)) {
 		logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", path, strerror(errno));
 		return false;
 	}
 
-	// Remove any invitation files
-	snprintf(path, sizeof(path), "%s" SLASH "invitations", mesh->confbase);
-	deltree(path);
+	make_invitation_path(mesh, conf_subdir, "", path, sizeof(path));
 
-	if(mkdir(path, 0700) && errno != EEXIST) {
+	if(mkdir(path, 0700)) {
 		logger(mesh, MESHLINK_DEBUG, "Could not create directory %s: %s\n", path, strerror(errno));
 		return false;
 	}
@@ -108,60 +190,333 @@ bool config_init(meshlink_handle_t *mesh) {
 }
 
 /// Wipe an existing configuration directory
-bool config_destroy(const char *confbase) {
+bool config_destroy(const char *confbase, const char *conf_subdir) {
+	assert(conf_subdir);
+
+	if(!confbase) {
+		return true;
+	}
+
+	struct stat st;
+
 	char path[PATH_MAX];
 
-	// Remove meshlink.conf
-	snprintf(path, sizeof(path), "%s" SLASH "meshlink.conf", confbase);
+	// Check the presence of configuration base sub directory.
+	snprintf(path, sizeof(path), "%s" SLASH "%s", confbase, conf_subdir);
 
-	if(unlink(path)) {
+	if(stat(path, &st)) {
 		if(errno == ENOENT) {
-			meshlink_errno = MESHLINK_ENOENT;
-			return false;
+			return true;
 		} else {
+			logger(NULL, MESHLINK_ERROR, "Cannot stat %s: %s\n", path, strerror(errno));
+			meshlink_errno = MESHLINK_ESTORAGE;
+			return false;
+		}
+	}
+
+	// Remove meshlink.conf
+	snprintf(path, sizeof(path), "%s" SLASH "%s" SLASH "meshlink.conf", confbase, conf_subdir);
+
+	if(unlink(path)) {
+		if(errno != ENOENT) {
 			logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", path, strerror(errno));
 			meshlink_errno = MESHLINK_ESTORAGE;
 			return false;
 		}
 	}
 
-	deltree(confbase);
+	snprintf(path, sizeof(path), "%s" SLASH "%s", confbase, conf_subdir);
+
+	if(!deltree(path)) {
+		logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	return sync_path(confbase);
+}
+
+static bool copytree(const char *src_dir_name, const void *src_key, const char *dst_dir_name, const void *dst_key) {
+	assert(src_dir_name);
+	assert(dst_dir_name);
+
+	char src_filename[PATH_MAX];
+	char dst_filename[PATH_MAX];
+	struct dirent *ent;
+
+	DIR *src_dir = opendir(src_dir_name);
+
+	if(!src_dir) {
+		logger(NULL, MESHLINK_ERROR, "Could not open directory file %s\n", src_dir_name);
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	// Delete if already exists and create a new destination directory
+	if(!deltree(dst_dir_name)) {
+		logger(NULL, MESHLINK_ERROR, "Cannot delete %s: %s\n", dst_dir_name, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	if(mkdir(dst_dir_name, 0700)) {
+		logger(NULL, MESHLINK_ERROR, "Could not create directory %s\n", dst_filename);
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	while((ent = readdir(src_dir))) {
+		if(ent->d_name[0] == '.') {
+			continue;
+		}
+
+		snprintf(dst_filename, sizeof(dst_filename), "%s" SLASH "%s", dst_dir_name, ent->d_name);
+		snprintf(src_filename, sizeof(src_filename), "%s" SLASH "%s", src_dir_name, ent->d_name);
+
+		if(ent->d_type == DT_DIR) {
+			if(!copytree(src_filename, src_key, dst_filename, dst_key)) {
+				logger(NULL, MESHLINK_ERROR, "Copying %s to %s failed\n", src_filename, dst_filename);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			if(!sync_path(dst_filename)) {
+				return false;
+			}
+		} else if(ent->d_type == DT_REG) {
+			struct stat st;
+			config_t config;
+
+			if(stat(src_filename, &st)) {
+				logger(NULL, MESHLINK_ERROR, "Could not stat file `%s': %s\n", src_filename, strerror(errno));
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			FILE *f = fopen(src_filename, "r");
+
+			if(!f) {
+				logger(NULL, MESHLINK_ERROR, "Failed to open `%s': %s\n", src_filename, strerror(errno));
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			if(!config_read_file(NULL, f, &config, src_key)) {
+				logger(NULL, MESHLINK_ERROR, "Failed to read `%s': %s\n", src_filename, strerror(errno));
+				fclose(f);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			if(fclose(f)) {
+				logger(NULL, MESHLINK_ERROR, "Failed to close `%s': %s\n", src_filename, strerror(errno));
+				config_free(&config);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			f = fopen(dst_filename, "w");
+
+			if(!f) {
+				logger(NULL, MESHLINK_ERROR, "Failed to open `%s': %s", dst_filename, strerror(errno));
+				config_free(&config);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			if(!config_write_file(NULL, f, &config, dst_key)) {
+				logger(NULL, MESHLINK_ERROR, "Failed to write `%s': %s", dst_filename, strerror(errno));
+				config_free(&config);
+				fclose(f);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			if(fclose(f)) {
+				logger(NULL, MESHLINK_ERROR, "Failed to close `%s': %s", dst_filename, strerror(errno));
+				config_free(&config);
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+
+			config_free(&config);
+
+			struct utimbuf times;
+			times.modtime = st.st_mtime;
+			times.actime = st.st_atime;
+
+			if(utime(dst_filename, &times)) {
+				logger(NULL, MESHLINK_ERROR, "Failed to utime `%s': %s", dst_filename, strerror(errno));
+				meshlink_errno = MESHLINK_ESTORAGE;
+				return false;
+			}
+		}
+	}
+
+	closedir(src_dir);
 	return true;
 }
 
+bool config_copy(meshlink_handle_t *mesh, const char *src_dir_name, const void *src_key, const char *dst_dir_name, const void *dst_key) {
+	assert(src_dir_name);
+	assert(dst_dir_name);
+
+	char src_filename[PATH_MAX];
+	char dst_filename[PATH_MAX];
+
+	snprintf(dst_filename, sizeof(dst_filename), "%s" SLASH "%s", mesh->confbase, dst_dir_name);
+	snprintf(src_filename, sizeof(src_filename), "%s" SLASH "%s", mesh->confbase, src_dir_name);
+
+	return copytree(src_filename, src_key, dst_filename, dst_key);
+}
+
 /// Check the presence of the main configuration file.
-bool main_config_exists(meshlink_handle_t *mesh) {
-	char path[PATH_MAX];
-	make_main_path(mesh, path, sizeof(path));
+bool main_config_exists(meshlink_handle_t *mesh, const char *conf_subdir) {
+	assert(conf_subdir);
 
+	if(!mesh->confbase) {
+		return false;
+	}
+
+	char path[PATH_MAX];
+	make_main_path(mesh, conf_subdir, path, sizeof(path));
 	return access(path, F_OK) == 0;
 }
 
-/// Lock the main configuration file.
+bool config_rename(meshlink_handle_t *mesh, const char *old_conf_subdir, const char *new_conf_subdir) {
+	assert(old_conf_subdir);
+	assert(new_conf_subdir);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
+	char old_path[PATH_MAX];
+	char new_path[PATH_MAX];
+
+	snprintf(old_path, sizeof(old_path), "%s" SLASH "%s", mesh->confbase, old_conf_subdir);
+	snprintf(new_path, sizeof(new_path), "%s" SLASH "%s", mesh->confbase, new_conf_subdir);
+
+	return rename(old_path, new_path) == 0 && sync_path(mesh->confbase);
+}
+
+bool config_sync(meshlink_handle_t *mesh, const char *conf_subdir) {
+	assert(conf_subdir);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
+	char path[PATH_MAX];
+	snprintf(path, sizeof(path), "%s" SLASH "%s" SLASH "hosts", mesh->confbase, conf_subdir);
+
+	if(!sync_path(path)) {
+		return false;
+	}
+
+	snprintf(path, sizeof(path), "%s" SLASH "%s", mesh->confbase, conf_subdir);
+
+	if(!sync_path(path)) {
+		return false;
+	}
+
+	return true;
+}
+
+bool meshlink_confbase_exists(meshlink_handle_t *mesh) {
+	if(!mesh->confbase) {
+		return false;
+	}
+
+	bool confbase_exists = false;
+	bool confbase_decryptable = false;
+
+	if(main_config_exists(mesh, "current")) {
+		confbase_exists = true;
+
+		if(mesh->config_key && main_config_decrypt(mesh, "current")) {
+			confbase_decryptable = true;
+		}
+	}
+
+	if(mesh->config_key && !confbase_decryptable && main_config_exists(mesh, "new")) {
+		confbase_exists = true;
+
+		if(main_config_decrypt(mesh, "new")) {
+			if(!config_destroy(mesh->confbase, "current")) {
+				return false;
+			}
+
+			if(!config_rename(mesh, "new", "current")) {
+				return false;
+			}
+
+			confbase_decryptable = true;
+		}
+	}
+
+	if(mesh->config_key && !confbase_decryptable && main_config_exists(mesh, "old")) {
+		confbase_exists = true;
+
+		if(main_config_decrypt(mesh, "old")) {
+			if(!config_destroy(mesh->confbase, "current")) {
+				return false;
+			}
+
+			if(!config_rename(mesh, "old", "current")) {
+				return false;
+			}
+
+			confbase_decryptable = true;
+		}
+	}
+
+	// Cleanup if current is existing with old and new
+	if(confbase_exists && confbase_decryptable) {
+		if(!config_destroy(mesh->confbase, "old") || !config_destroy(mesh->confbase, "new")) {
+			return false;
+		}
+	}
+
+	return confbase_exists;
+}
+
+/// Lock the main configuration file. Creates confbase if necessary.
 bool main_config_lock(meshlink_handle_t *mesh) {
+	if(!mesh->confbase) {
+		return true;
+	}
+
+	if(mkdir(mesh->confbase, 0700) && errno != EEXIST) {
+		logger(NULL, MESHLINK_ERROR, "Cannot create configuration directory %s: %s", mesh->confbase, strerror(errno));
+		meshlink_close(mesh);
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return NULL;
+	}
+
 	char path[PATH_MAX];
-	make_main_path(mesh, path, sizeof(path));
+	snprintf(path, sizeof(path), "%s" SLASH "meshlink.lock", mesh->confbase);
 
-	mesh->conffile = fopen(path, "r");
+	mesh->lockfile = fopen(path, "w+");
 
-	if(!mesh->conffile) {
+	if(!mesh->lockfile) {
 		logger(NULL, MESHLINK_ERROR, "Cannot not open %s: %s\n", path, strerror(errno));
 		meshlink_errno = MESHLINK_ESTORAGE;
 		return false;
 	}
 
 #ifdef FD_CLOEXEC
-	fcntl(fileno(mesh->conffile), F_SETFD, FD_CLOEXEC);
+	fcntl(fileno(mesh->lockfile), F_SETFD, FD_CLOEXEC);
 #endif
 
 #ifdef HAVE_MINGW
 	// TODO: use _locking()?
 #else
 
-	if(flock(fileno(mesh->conffile), LOCK_EX | LOCK_NB) != 0) {
+	if(flock(fileno(mesh->lockfile), LOCK_EX | LOCK_NB) != 0) {
 		logger(NULL, MESHLINK_ERROR, "Cannot lock %s: %s\n", path, strerror(errno));
-		fclose(mesh->conffile);
-		mesh->conffile = NULL;
+		fclose(mesh->lockfile);
+		mesh->lockfile = NULL;
 		meshlink_errno = MESHLINK_EBUSY;
 		return false;
 	}
@@ -173,21 +528,21 @@ bool main_config_lock(meshlink_handle_t *mesh) {
 
 /// Unlock the main configuration file.
 void main_config_unlock(meshlink_handle_t *mesh) {
-	if(mesh->conffile) {
-		fclose(mesh->conffile);
-		mesh->conffile = NULL;
+	if(mesh->lockfile) {
+		fclose(mesh->lockfile);
+		mesh->lockfile = NULL;
 	}
 }
 
 /// Read a configuration file from a FILE handle.
-bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config) {
-	(void)mesh;
+bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config, const void *key) {
+	assert(f);
+
 	long len;
 
 	if(fseek(f, 0, SEEK_END) || !(len = ftell(f)) || fseek(f, 0, SEEK_SET)) {
 		logger(mesh, MESHLINK_ERROR, "Cannot get config file size: %s\n", strerror(errno));
 		meshlink_errno = MESHLINK_ESTORAGE;
-		fclose(f);
 		return false;
 	}
 
@@ -196,17 +551,17 @@ bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config) {
 	if(fread(buf, len, 1, f) != 1) {
 		logger(mesh, MESHLINK_ERROR, "Cannot read config file: %s\n", strerror(errno));
 		meshlink_errno = MESHLINK_ESTORAGE;
-		fclose(f);
 		return false;
 	}
 
-	if(mesh->config_key) {
+	if(key) {
 		uint8_t *decrypted = xmalloc(len);
 		size_t decrypted_len = len;
 		chacha_poly1305_ctx_t *ctx = chacha_poly1305_init();
-		chacha_poly1305_set_key(ctx, mesh->config_key);
+		chacha_poly1305_set_key(ctx, key);
 
 		if(len > 12 && chacha_poly1305_decrypt_iv96(ctx, buf, buf + 12, len - 12, decrypted, &decrypted_len)) {
+			chacha_poly1305_exit(ctx);
 			free(buf);
 			config->buf = decrypted;
 			config->len = decrypted_len;
@@ -214,6 +569,7 @@ bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config) {
 		} else {
 			logger(mesh, MESHLINK_ERROR, "Cannot decrypt config file\n");
 			meshlink_errno = MESHLINK_ESTORAGE;
+			chacha_poly1305_exit(ctx);
 			free(decrypted);
 			free(buf);
 			return false;
@@ -227,18 +583,26 @@ bool config_read_file(meshlink_handle_t *mesh, FILE *f, config_t *config) {
 }
 
 /// Write a configuration file to a FILE handle.
-bool config_write_file(meshlink_handle_t *mesh, FILE *f, const config_t *config) {
-	if(mesh->config_key) {
+bool config_write_file(meshlink_handle_t *mesh, FILE *f, const config_t *config, const void *key) {
+	assert(f);
+
+	if(key) {
 		uint8_t buf[config->len + 16];
 		size_t len = sizeof(buf);
 		uint8_t seqbuf[12];
 		randomize(&seqbuf, sizeof(seqbuf));
 		chacha_poly1305_ctx_t *ctx = chacha_poly1305_init();
-		chacha_poly1305_set_key(ctx, mesh->config_key);
+		chacha_poly1305_set_key(ctx, key);
 		bool success = false;
 
 		if(chacha_poly1305_encrypt_iv96(ctx, seqbuf, config->buf, config->len, buf, &len)) {
 			success = fwrite(seqbuf, sizeof(seqbuf), 1, f) == 1 && fwrite(buf, len, 1, f) == 1;
+
+			if(!success) {
+				logger(mesh, MESHLINK_ERROR, "Cannot write config file: %s", strerror(errno));
+			}
+
+			meshlink_errno = MESHLINK_ESTORAGE;
 		} else {
 			logger(mesh, MESHLINK_ERROR, "Cannot encrypt config file\n");
 			meshlink_errno = MESHLINK_ESTORAGE;
@@ -254,28 +618,54 @@ bool config_write_file(meshlink_handle_t *mesh, FILE *f, const config_t *config)
 		return false;
 	}
 
+	if(fflush(f)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to flush file: %s", strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	if(fsync(fileno(f))) {
+		logger(mesh, MESHLINK_ERROR, "Failed to sync file: %s\n", strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
 	return true;
 }
 
 /// Free resources of a loaded configuration file.
 void config_free(config_t *config) {
+	assert(!config->len || config->buf);
+
 	free((uint8_t *)config->buf);
 	config->buf = NULL;
 	config->len = 0;
 }
 
 /// Check the presence of a host configuration file.
-bool config_exists(meshlink_handle_t *mesh, const char *name) {
+bool config_exists(meshlink_handle_t *mesh, const char *conf_subdir, const char *name) {
+	assert(conf_subdir);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
 	char path[PATH_MAX];
-	make_host_path(mesh, name, path, sizeof(path));
+	make_host_path(mesh, conf_subdir, name, path, sizeof(path));
 
 	return access(path, F_OK) == 0;
 }
 
 /// Read a host configuration file.
-bool config_read(meshlink_handle_t *mesh, const char *name, config_t *config) {
+bool config_read(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, config_t *config, void *key) {
+	assert(conf_subdir);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
 	char path[PATH_MAX];
-	make_host_path(mesh, name, path, sizeof(path));
+	make_host_path(mesh, conf_subdir, name, path, sizeof(path));
 
 	FILE *f = fopen(path, "r");
 
@@ -284,42 +674,129 @@ bool config_read(meshlink_handle_t *mesh, const char *name, config_t *config) {
 		return false;
 	}
 
-	if(!config_read_file(mesh, f, config)) {
+	if(!config_read_file(mesh, f, config, key)) {
 		logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
 		fclose(f);
 		return false;
 	}
 
 	fclose(f);
+
+	return true;
+}
+
+bool config_scan_all(meshlink_handle_t *mesh, const char *conf_subdir, const char *conf_type, config_scan_action_t action, void *arg) {
+	assert(conf_subdir);
+	assert(conf_type);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
+	DIR *dir;
+	struct dirent *ent;
+	char dname[PATH_MAX];
+	snprintf(dname, sizeof(dname), "%s" SLASH "%s" SLASH "%s", mesh->confbase, conf_subdir, conf_type);
+
+	dir = opendir(dname);
+
+	if(!dir) {
+		logger(mesh, MESHLINK_ERROR, "Could not open %s: %s", dname, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	while((ent = readdir(dir))) {
+		if(ent->d_name[0] == '.') {
+			continue;
+		}
+
+		if(!action(mesh, ent->d_name, arg)) {
+			closedir(dir);
+			return false;
+		}
+	}
+
+	closedir(dir);
 	return true;
 }
 
 /// Write a host configuration file.
-bool config_write(meshlink_handle_t *mesh, const char *name, const config_t *config) {
+bool config_write(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, const config_t *config, void *key) {
+	assert(conf_subdir);
+	assert(name);
+	assert(config);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
 	char path[PATH_MAX];
-	make_host_path(mesh, name, path, sizeof(path));
+	char tmp_path[PATH_MAX + 4];
+	make_host_path(mesh, conf_subdir, name, path, sizeof(path));
+	snprintf(tmp_path, sizeof(tmp_path), "%s.tmp", path);
 
-	FILE *f = fopen(path, "w");
+	FILE *f = fopen(tmp_path, "w");
 
 	if(!f) {
-		logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+		logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", tmp_path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
 		return false;
 	}
 
-	if(!config_write_file(mesh, f, config)) {
-		logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
+	if(!config_write_file(mesh, f, config, key)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", tmp_path, strerror(errno));
 		fclose(f);
 		return false;
 	}
 
-	fclose(f);
+	if(fclose(f)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to close `%s': %s", tmp_path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	if(rename(tmp_path, path)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to rename `%s' to `%s': %s", tmp_path, path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	return true;
+}
+
+/// Delete a host configuration file.
+bool config_delete(meshlink_handle_t *mesh, const char *conf_subdir, const char *name) {
+	assert(conf_subdir);
+	assert(name);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
+	char path[PATH_MAX];
+	make_host_path(mesh, conf_subdir, name, path, sizeof(path));
+
+	if(unlink(path) && errno != ENOENT) {
+		logger(mesh, MESHLINK_ERROR, "Failed to unlink `%s': %s", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
 	return true;
 }
 
 /// Read the main configuration file.
-bool main_config_read(meshlink_handle_t *mesh, config_t *config) {
+bool main_config_read(meshlink_handle_t *mesh, const char *conf_subdir, config_t *config, void *key) {
+	assert(conf_subdir);
+	assert(config);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
 	char path[PATH_MAX];
-	make_main_path(mesh, path, sizeof(path));
+	make_main_path(mesh, conf_subdir, path, sizeof(path));
 
 	FILE *f = fopen(path, "r");
 
@@ -328,44 +805,75 @@ bool main_config_read(meshlink_handle_t *mesh, config_t *config) {
 		return false;
 	}
 
-	if(!config_read_file(mesh, f, config)) {
+	if(!config_read_file(mesh, f, config, key)) {
 		logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
 		fclose(f);
 		return false;
 	}
 
 	fclose(f);
+
 	return true;
 }
 
 /// Write the main configuration file.
-bool main_config_write(meshlink_handle_t *mesh, const config_t *config) {
+bool main_config_write(meshlink_handle_t *mesh, const char *conf_subdir, const config_t *config, void *key) {
+	assert(conf_subdir);
+	assert(config);
+
+	if(!mesh->confbase) {
+		return true;
+	}
+
 	char path[PATH_MAX];
-	make_main_path(mesh, path, sizeof(path));
+	char tmp_path[PATH_MAX + 4];
+	make_main_path(mesh, conf_subdir, path, sizeof(path));
+	snprintf(tmp_path, sizeof(tmp_path), "%s.tmp", path);
 
-	FILE *f = fopen(path, "w");
+	FILE *f = fopen(tmp_path, "w");
 
 	if(!f) {
-		logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+		logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", tmp_path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
 		return false;
 	}
 
-	if(!config_write_file(mesh, f, config)) {
-		logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
+	if(!config_write_file(mesh, f, config, key)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", tmp_path, strerror(errno));
 		fclose(f);
 		return false;
 	}
 
-	fclose(f);
+	if(rename(tmp_path, path)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to rename `%s' to `%s': %s", tmp_path, path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		fclose(f);
+		return false;
+	}
+
+	if(fclose(f)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to close `%s': %s", tmp_path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
 	return true;
 }
 
-/// Read an invitation file, and immediately delete it.
-bool invitation_read(meshlink_handle_t *mesh, const char *name, config_t *config) {
+/// Read an invitation file from the confbase sub-directory, and immediately delete it.
+bool invitation_read(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, config_t *config, void *key) {
+	assert(conf_subdir);
+	assert(name);
+	assert(config);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
 	char path[PATH_MAX];
 	char used_path[PATH_MAX];
-	make_invitation_path(mesh, name, path, sizeof(path));
-	make_used_invitation_path(mesh, name, used_path, sizeof(used_path));
+	make_invitation_path(mesh, conf_subdir, name, path, sizeof(path));
+	make_used_invitation_path(mesh, conf_subdir, name, used_path, sizeof(used_path));
 
 	// Atomically rename the invitation file
 	if(rename(path, used_path)) {
@@ -395,14 +903,14 @@ bool invitation_read(meshlink_handle_t *mesh, const char *name, config_t *config
 		return false;
 	}
 
-	if(time(NULL) > st.st_mtime + mesh->invitation_timeout) {
+	if(time(NULL) >= st.st_mtime + mesh->invitation_timeout) {
 		logger(mesh, MESHLINK_ERROR, "Peer tried to use an outdated invitation file %s\n", name);
 		fclose(f);
 		unlink(used_path);
 		return false;
 	}
 
-	if(!config_read_file(mesh, f, config)) {
+	if(!config_read_file(mesh, f, config, key)) {
 		logger(mesh, MESHLINK_ERROR, "Failed to read `%s': %s", path, strerror(errno));
 		fclose(f);
 		unlink(used_path);
@@ -410,36 +918,75 @@ bool invitation_read(meshlink_handle_t *mesh, const char *name, config_t *config
 	}
 
 	fclose(f);
-	unlink(used_path);
+
+	if(unlink(used_path)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to unlink `%s': %s", path, strerror(errno));
+		return false;
+	}
+
+	snprintf(path, sizeof(path), "%s" SLASH "%s" SLASH "invitations", mesh->confbase, conf_subdir);
+
+	if(!sync_path(path)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to sync `%s': %s", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
 	return true;
 }
 
 /// Write an invitation file.
-bool invitation_write(meshlink_handle_t *mesh, const char *name, const config_t *config) {
+bool invitation_write(meshlink_handle_t *mesh, const char *conf_subdir, const char *name, const config_t *config, void *key) {
+	assert(conf_subdir);
+	assert(name);
+	assert(config);
+
+	if(!mesh->confbase) {
+		return false;
+	}
+
 	char path[PATH_MAX];
-	make_invitation_path(mesh, name, path, sizeof(path));
+	make_invitation_path(mesh, conf_subdir, name, path, sizeof(path));
 
 	FILE *f = fopen(path, "w");
 
 	if(!f) {
 		logger(mesh, MESHLINK_ERROR, "Failed to open `%s': %s", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
 		return false;
 	}
 
-	if(!config_write_file(mesh, f, config)) {
+	if(!config_write_file(mesh, f, config, key)) {
 		logger(mesh, MESHLINK_ERROR, "Failed to write `%s': %s", path, strerror(errno));
 		fclose(f);
 		return false;
 	}
 
-	fclose(f);
+	if(fclose(f)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to close `%s': %s", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
+	snprintf(path, sizeof(path), "%s" SLASH "%s" SLASH "invitations", mesh->confbase, conf_subdir);
+
+	if(!sync_path(path)) {
+		logger(mesh, MESHLINK_ERROR, "Failed to sync `%s': %s", path, strerror(errno));
+		meshlink_errno = MESHLINK_ESTORAGE;
+		return false;
+	}
+
 	return true;
 }
 
 /// Purge old invitation files
 size_t invitation_purge_old(meshlink_handle_t *mesh, time_t deadline) {
+	if(!mesh->confbase) {
+		return true;
+	}
+
 	char path[PATH_MAX];
-	make_invitation_path(mesh, "", path, sizeof(path));
+	make_invitation_path(mesh, "current", "", path, sizeof(path));
 
 	DIR *dir = opendir(path);