Merge request problems resolved

src/coincerd.c

@@ -56,13 +56,15 @@ int main(void)
 	global_state_t		global_state;
 	struct evconnlistener	*listener;
 	struct event		*sigint_event;
-	time_t			t;
+	struct event		*sigterm_event;
 
-	srand((unsigned) time(&t));
+	/* TODO: use randombytes (from libsodium?) for the seed of randomness */
+	srand((unsigned) time(NULL));
 
 	/* initialize all global_state variables */
 	global_state.event_loop	= NULL;
 	if (setup_paths(&global_state.filepaths)) {
+		log_error("Initializing paths to needed files/dirs");
 		return 1;
 	}
 
@@ -70,13 +72,12 @@ int main(void)
 	linkedlist_init(&global_state.neighbours);
 	linkedlist_init(&global_state.peers);
 
-	if (fetch_peers(global_state.filepaths.peers, &global_state.peers)) {
-		return 2;
-	}
+	fetch_peers(global_state.filepaths.peers, &global_state.peers);
 
 	/* setup everything needed for TCP listening */
 	if (listen_init(&listener, &global_state) != 0) {
-		return 3;
+		log_error("Initialization of TCP listening");
+		return 2;
 	}
 
 	/* register SIGINT event to its callback */
@@ -85,8 +86,18 @@ int main(void)
 				    signal_cb,
 				    &global_state);
 	if (!sigint_event || event_add(sigint_event, NULL) < 0) {
-		log_error("main - couldn't create or add SIGINT event");
-		return 4;
+		log_error("Creating or adding SIGINT event");
+		return 3;
+	}
+
+	/* register SIGTERM event too */
+	sigterm_event = evsignal_new(global_state.event_loop,
+				     SIGTERM,
+				     signal_cb,
+				     &global_state);
+	if (!sigterm_event || event_add(sigterm_event, NULL) < 0) {
+		log_error("Creating or adding SIGTERM event");
+		return 3;
 	}
 
 	/* setup a function that actively checks the number of neighbours */
@@ -99,8 +110,8 @@ int main(void)
 				conns_cb,
 				&global_state);
 	if (!conns_event || event_add(conns_event, &conns_interval) < 0) {
-		log_error("main - couldn't create or add conns_event");
-		return 4;
+		log_error("Creating or adding Connections event");
+		return 3;
 	}
 
 	/* initiate joining the coincer network */
@@ -119,6 +130,7 @@ int main(void)
 
 	evconnlistener_free(listener);
 	event_free(sigint_event);
+	event_free(sigterm_event);
 	event_free(conns_event);
 	event_base_free(global_state.event_loop);
 

src/configuration.c

@@ -38,7 +38,7 @@ static int set_homedir(char **homedir)
 {
 	*homedir = getenv("HOME");
 	if (*homedir == NULL || *homedir[0] == '\0') {
-		log_error("set_homedir - cannot find home directory");
+		log_error("Can not find home directory");
 		return 1;
 	}
 	return 0;
@@ -70,7 +70,7 @@ static int set_directories(char **config_dir, char **data_dir)
 					     sizeof("/.config/" PACKAGE_NAME
 						    "/"));
 		if (*config_dir == NULL) {
-			log_error("set_directories - setting config_dir");
+			log_error("Setting configdir");
 			return 1;
 		}
 		strcpy(*config_dir, homedir);
@@ -80,7 +80,7 @@ static int set_directories(char **config_dir, char **data_dir)
 		*config_dir = (char *) malloc(tmpsize +
 					     sizeof("/" PACKAGE_NAME "/"));
 		if (*config_dir == NULL) {
-			log_error("set_directories - setting config_dir");
+			log_error("Setting configdir");
 			return 1;
 		}
 		strcpy(*config_dir, tmpchar);
@@ -99,7 +99,7 @@ static int set_directories(char **config_dir, char **data_dir)
 					   sizeof("/.local/share/" PACKAGE_NAME
 						  "/"));
 		if (*data_dir == NULL) {
-			log_error("set_directories - setting data_dir");
+			log_error("Setting datadir");
 			free(config_dir);
 			return 1;
 		}
@@ -110,7 +110,7 @@ static int set_directories(char **config_dir, char **data_dir)
 		*data_dir = (char *) malloc(tmpsize +
 					   sizeof("/" PACKAGE_NAME "/"));
 		if (*data_dir == NULL) {
-			log_error("set_directories - setting data_dir");
+			log_error("Setting datadir");
 			free(config_dir);
 			return 1;
 		}
@@ -139,16 +139,15 @@ static int create_dirs(const char *config_dir, const char *data_dir)
 		if (errno == ENOENT) {
 			/* create */
 			if (mkdir(config_dir, S_IRWXU)) {
-				log_error("create_dirs - could not create "
-					  "configuration directory %s",
-					  config_dir);
+				log_error("Could not create configuration "
+					  "directory %s", config_dir);
 				return 1;
 			} else {
 				log_debug("create_dirs - created configuration "
 					  "directory %s", config_dir);
 			}
 		} else {
-			log_error("create_dirs - could not open configuration "
+			log_error("Could not open configuration "
 				  "directory %s", config_dir);
 			return 1;
 		}
@@ -159,17 +158,15 @@ static int create_dirs(const char *config_dir, const char *data_dir)
 		if (errno == ENOENT) {
 			/* create */
 			if (mkdir(data_dir, S_IRWXU)) {
-				log_error("create_dirs - could not create "
-					  "data directory %s",
-					  data_dir);
+				log_error("Could not create "
+					  "data directory %s", data_dir);
 				return 1;
 			} else {
 				log_debug("create_dirs - created data "
 					  "directory %s", data_dir);
 			}
 		} else {
-			log_error("create_dirs - could not open data "
-				  "directory %s", data_dir);
+			log_error("Could not open data directory %s", data_dir);
 			return 1;
 		}
 	}

src/linkedlist.c

@@ -216,7 +216,7 @@ linkedlist_node_t *linkedlist_insert_after(linkedlist_t		*root,
 
 	new_node = (linkedlist_node_t *) malloc(sizeof(linkedlist_node_t));
 	if (new_node == NULL) {
-		log_error("linkedlist_insert_after - malloc");
+		log_error("Inserting a new node");
 		return NULL;
 	}
 

src/neighbours.c

@@ -127,6 +127,54 @@ void delete_neighbour(linkedlist_t *neighbours, struct bufferevent *bev)
 	linkedlist_delete(neighbour_node);
 }
 
+/**
+ * Fetch pointers to neighbours with specific flags set, into an array
+ * that is being allocated in here.
+ *
+ * @param	neighbours	Our neighbours.
+ * @param	output		Output array of pointers to satisfying
+ *				neighbours. If set to NULL, function just
+ *				returns the number of them.
+ * @param	flags		Choose neighbours based on these flags.
+ *				Fetches output with all neighbours if set to 0.
+ *
+ * @return	>=0		The number of satisfying neighbours.
+ * @return	-1		Allocation failure.
+ */
+int fetch_specific_neighbours(const linkedlist_t	*neighbours,
+			      neighbour_t		***output,
+			      int			flags)
+{
+	linkedlist_node_t	*current_node;
+	neighbour_t		*current_neighbour;
+	size_t			n = 0;
+
+	if (output != NULL) {
+		*output = (neighbour_t **) malloc(linkedlist_size(neighbours) *
+						  sizeof(neighbour_t *));
+		if (*output == NULL) {
+			log_error("Fetching specific neighbours");
+			return -1;
+		}
+	}
+
+	current_node = linkedlist_get_first(neighbours);
+	while (current_node != NULL) {
+		current_neighbour = (neighbour_t *) current_node->data;
+		/* if all specified flags are being set on this neighbour */
+		if ((current_neighbour->flags & flags) == flags) {
+			if (output != NULL) {
+				(*output)[n++] = current_neighbour;
+			} else {
+				n++;
+			}
+		}
+		current_node = linkedlist_get_next(neighbours, current_node);
+	}
+
+	return n;
+}
+
 /**
  * Find neighbour in neighbours based on their bufferevent.
  *
@@ -148,7 +196,6 @@ neighbour_t *find_neighbour(const linkedlist_t		*neighbours,
 
 		/* bufferevents equal => neighbour found */
 		if (current_data->buffer_event == bev) {
-
 			/* return node's data; struct s_neighbour */
 			return current_data;
 		}
@@ -189,3 +236,25 @@ neighbour_t *find_neighbour_by_addr(const linkedlist_t		*neighbours,
 	/* neighbour not found */
 	return NULL;
 }
+
+/**
+ * Set flags on given neighbour.
+ *
+ * @param	neighbour	Set flags on this neighbour.
+ * @param	flags		Set these flags on the neighbour.
+ */
+void set_neighbour_flags(neighbour_t *neighbour, int flags)
+{
+	neighbour->flags |= flags;
+}
+
+/**
+ * Unset flags on given neighbour.
+ *
+ * @param	neighbour	Unset flags on this neighbour.
+ * @param	flags		Unset these flags on the neighbour.
+ */
+void unset_neighbour_flags(neighbour_t *neighbour, int flags)
+{
+	neighbour->flags &= ~flags;
+}

src/neighbours.h

@@ -28,6 +28,9 @@
 /* minimum number of peers we need to be connected to */
 #define MIN_NEIGHBOURS	3
 
+/* request for addresses */
+#define NEIGHBOUR_ADDRS_REQ	0x01
+
 /** Data type for the linkedlist of neighbours. */
 typedef struct s_neighbour {
 	/** Neighbour's IPv6 address.
@@ -37,6 +40,8 @@ typedef struct s_neighbour {
 	struct	bufferevent *buffer_event;
 	/** Number of failed ping attempts -- max 3, then disconnect. */
 	size_t	failed_pings;
+	/** A set of flags for this neighbour. */
+	int	flags;
 } neighbour_t;
 
 neighbour_t *add_new_neighbour(linkedlist_t		*neighbours,
@@ -47,6 +52,9 @@ void clear_neighbours(linkedlist_t *neighbours);
 
 void delete_neighbour(linkedlist_t *neighbours, struct bufferevent *bev);
 
+int fetch_specific_neighbours(const linkedlist_t	*neighbours,
+			      neighbour_t		***output,
+			      int			flags);
 
 neighbour_t *find_neighbour(const linkedlist_t		*neighbours,
 			    const struct bufferevent	*bev);
@@ -54,4 +62,7 @@ neighbour_t *find_neighbour(const linkedlist_t		*neighbours,
 neighbour_t *find_neighbour_by_addr(const linkedlist_t		*neighbours,
 				    const struct in6_addr	*ip_addr);
 
+void set_neighbour_flags(neighbour_t *neighbour, int flags);
+
+void unset_neighbour_flags(neighbour_t *neighbour, int flags);
 #endif /* NEIGHBOURS_H */

src/p2p.c

@@ -48,12 +48,12 @@ static void ip_to_string(const struct in6_addr *binary_ip, char *ip)
 }
 
 /**
- * Ask the neighbour for a list of peers.
+ * Ask the neighbour for a list of addresses.
  *
  * @param	global_state	Data for the event loop to work with.
  * @param	neighbour	The neighbour to be asked.
  */
-void ask_for_peers(neighbour_t *neighbour)
+static void ask_for_addresses(neighbour_t *neighbour)
 {
 	struct bufferevent *bev;
 
@@ -64,6 +64,8 @@ void ask_for_peers(neighbour_t *neighbour)
 	/* send message "peers" to the neighbour, as a request
 	 * for the list of peers; 6 is the number of bytes to be transmitted */
 	evbuffer_add(bufferevent_get_output(bev), "peers", 6);
+	/* accept addresses only from those neighbours that we've asked */
+	set_neighbour_flags(neighbour, NEIGHBOUR_ADDRS_REQ);
 }
 
 /**
@@ -125,6 +127,10 @@ static void p2p_process(struct bufferevent *bev, void *ctx)
 
 	/* allocate memory for the input message including '\0' */
 	message = (char *) malloc((len + 1) * sizeof(char));
+	if (message == NULL) {
+		log_error("Received message allocation");
+		return;
+	}
 
 	/* drain input buffer into data; -1 if evbuffer_remove failed */
 	if (evbuffer_remove(input, message, len) == -1) {
@@ -147,9 +153,12 @@ static void p2p_process(struct bufferevent *bev, void *ctx)
 	/* "peers" is a request for list of addresses */
 	} else if (strcmp(message, "peers") == 0) {
 		peers_to_str(&global_state->peers, response);
-	/* list of peers */
+	/* list of addresses */
 	} else {
-		process_peers(global_state, message);
+		if (neighbour->flags & NEIGHBOUR_ADDRS_REQ) {
+			process_peers(global_state, message);
+			unset_neighbour_flags(neighbour, NEIGHBOUR_ADDRS_REQ);
+		}
 	}
 
 	if (response[0] != '\0') {
@@ -192,9 +201,7 @@ static void timeout_process(linkedlist_t	*neighbours,
 
 		neighbour->failed_pings++;
 	} else {
-		log_info("timeout_process - 3 failed pings."
-			 " Removing %s from neighbours",
-			 text_ip);
+		log_info("%s timed out", text_ip);
 		delete_neighbour(neighbours, neighbour->buffer_event);
 	}
 }
@@ -239,20 +246,22 @@ static void process_pending_neighbour(global_state_t	*global_state,
 				      neighbour_t	*neighbour,
 				      short		events)
 {
-	size_t		available_peers_size;
+	int		available_peers_size;
 	int		needed_conns;
 	neighbour_t	*new_neighbour;
 	char		text_ip[INET6_ADDRSTRLEN];
 
-	available_peers_size = fetch_available_peers(&global_state->peers,
-						     NULL);
+	/* fetch peers with PEER_AVAILABLE flag set;
+	 * no allocation with NULL parameter -> result always >=0 */
+	available_peers_size = fetch_specific_peers(&global_state->peers,
+						    NULL,
+						    PEER_AVAILABLE);
 	/* initialize text_ip */
 	ip_to_string(&neighbour->addr, text_ip);
 
 	/* we've successfully connected to the neighbour */
 	if (events & BEV_EVENT_CONNECTED) {
-		log_info("process_pending_neighbour - connecting to "
-			 "%s was SUCCESSFUL", text_ip);
+		log_info("%s successfully connected", text_ip);
 		/* we've got a new neighbour;
 		 * we can't just delete the neighbour from pending
 		 * and add it into 'neighbours' as the delete would
@@ -268,14 +277,14 @@ static void process_pending_neighbour(global_state_t	*global_state,
 		/* if we need more neighbours */
 		if (needed_conns > 0) {
 			/* and we don't have enough available */
-			if ((int) available_peers_size < needed_conns) {
+			if (available_peers_size < needed_conns) {
 				ask_for_addresses(new_neighbour);
 			}
 		}
 	/* connecting to the neighbour was unsuccessful */
 	} else {
-		log_info("process_pending_neighbour - connecting to "
-			 "%s was NOT SUCCESSFUL", text_ip);
+		log_debug("process_pending_neighbour - connecting to "
+			  "%s was unsuccessful", text_ip);
 		/* the peer is no longer a pending neighbour */
 		delete_neighbour(&global_state->pending_neighbours,
 				 neighbour->buffer_event);
@@ -299,12 +308,11 @@ static void process_neighbour(global_state_t	*global_state,
 	ip_to_string(&neighbour->addr, text_ip);
 
 	if (events & BEV_EVENT_ERROR) {
-		log_info("process_neighbour - error on bev: removing %s",
-			 text_ip);
+		log_info("Connection error, removing %s", text_ip);
 		delete_neighbour(&global_state->neighbours,
 				 neighbour->buffer_event);
 	} else if (events & BEV_EVENT_EOF) {
-		log_info("process_neighbour - %s disconnected", text_ip);
+		log_info("%s disconnected", text_ip);
 		delete_neighbour(&global_state->neighbours,
 				 neighbour->buffer_event);
 	/* timeout flag on 'bev' */
@@ -357,6 +365,7 @@ static void accept_connection(struct evconnlistener *listener,
 	struct event_base	*base;
 	struct bufferevent	*bev;
 	struct in6_addr		*new_addr;
+	peer_t			*new_peer;
 	char			text_ip[INET6_ADDRSTRLEN];
 	struct timeval		timeout;
 
@@ -402,9 +411,12 @@ static void accept_connection(struct evconnlistener *listener,
 		return;
 	}
 
-	log_info("accept_connection - new connection from [%s]:%d", text_ip,
+	log_info("New connection from [%s]:%d", text_ip,
 		ntohs(addr_in6->sin6_port));
-	save_peer(&global_state->peers, new_addr);
+	if ((new_peer = save_peer(&global_state->peers, new_addr))) {
+		/* we are now connected to this peer, hence unavailable */
+		unset_peer_flags(new_peer, PEER_AVAILABLE);
+	}
 }
 
 /**
@@ -420,8 +432,10 @@ static void accept_error_cb(struct evconnlistener *listener,
 	global_state_t *global_state = (struct s_global_state *) ctx;
 
 	int err = EVUTIL_SOCKET_ERROR();
-	log_error("accept_error_cb - got an error %d (%s) on the listener. "
-		  "Shutting down.", err, evutil_socket_error_to_string(err));
+
+	/* TODO: If we have enough connections, don't stop the event loop */
+	log_error("Error %d (%s) on the listener, shutting down",
+		  err, evutil_socket_error_to_string(err));
 
 	/* stop the event loop */
 	event_base_loopexit(base, NULL);
@@ -449,7 +463,7 @@ int listen_init(struct evconnlistener 	**listener,
 
 	*base = event_base_new();
 	if (!*base) {
-		log_error("listen_init - event_base creation failure");
+		log_error("Creating eventbase");
 		return 1;
 	}
 
@@ -467,7 +481,7 @@ int listen_init(struct evconnlistener 	**listener,
 					    sizeof(sock_addr));
 
 	if (!*listener) {