stream: add support for UNIX streams

src/libstrongswan/networking/streams/stream.c

@@ -16,6 +16,8 @@
 #include <library.h>
 #include <errno.h>
 #include <unistd.h>
+#include <sys/socket.h>
+#include <sys/un.h>
 
 typedef struct private_stream_t private_stream_t;
 
@@ -266,3 +268,50 @@ stream_t *stream_create_from_fd(int fd)
 
 	return &this->public;
 }
+
+/**
+ * See header
+ */
+int stream_parse_uri_unix(char *uri, struct sockaddr_un *addr)
+{
+	if (!strpfx(uri, "unix://"))
+	{
+		return -1;
+	}
+	uri += strlen("unix://");
+
+	memset(addr, 0, sizeof(*addr));
+	addr->sun_family = AF_UNIX;
+	strncpy(addr->sun_path, uri, sizeof(addr->sun_path));
+
+	return offsetof(struct sockaddr_un, sun_path) + strlen(addr->sun_path);
+}
+
+/**
+ * See header
+ */
+stream_t *stream_create_unix(char *uri)
+{
+	struct sockaddr_un addr;
+	int len, fd;
+
+	len = stream_parse_uri_unix(uri, &addr);
+	if (len == -1)
+	{
+		DBG1(DBG_NET, "invalid stream URI: '%s'", uri);
+		return NULL;
+	}
+	fd = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (fd < 0)
+	{
+		DBG1(DBG_NET, "opening socket '%s' failed: %s", uri, strerror(errno));
+		return NULL;
+	}
+	if (connect(fd, (struct sockaddr*)&addr, len) < 0)
+	{
+		DBG1(DBG_NET, "connecting to '%s' failed: %s", uri, strerror(errno));
+		close(fd);
+		return NULL;
+	}
+	return stream_create_from_fd(fd);
+}

src/libstrongswan/networking/streams/stream.h

@@ -25,6 +25,8 @@ typedef struct stream_t stream_t;
 
 #include <library.h>
 
+#include <sys/un.h>
+
 /**
  * Constructor function prototype for stream_t.
  *
@@ -121,6 +123,28 @@ struct stream_t {
 	void (*destroy)(stream_t *this);
 };
 
+/**
+ * Create a stream for UNIX sockets.
+ *
+ * UNIX URIs start with unix://, followed by the socket path. For absolute
+ * paths, an URI looks something like:
+ *
+ *   unix:///path/to/socket
+ *
+ * @param uri		UNIX socket specific URI, must start with "unix://"
+ * @return			stream instance, NULL on failure
+ */
+stream_t *stream_create_unix(char *uri);
+
+/**
+ * Helper function to parse a unix:// URI to a sockaddr
+ *
+ * @param uri		URI
+ * @param addr		sockaddr
+ * @return			length of sockaddr, -1 on error
+ */
+int stream_parse_uri_unix(char *uri, struct sockaddr_un *addr);
+
 /**
  * Create a stream from a file descriptor.
  *

src/libstrongswan/networking/streams/stream_manager.c

@@ -247,6 +247,8 @@ METHOD(stream_manager_t, remove_service, void,
 METHOD(stream_manager_t, destroy, void,
 	private_stream_manager_t *this)
 {
+	remove_stream(this, stream_create_unix);
+
 	this->streams->destroy(this->streams);
 	this->services->destroy(this->services);
 	this->running->destroy(this->running);
@@ -278,5 +280,7 @@ stream_manager_t *stream_manager_create()
 		.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
 	);
 
+	add_stream(this, "unix://", stream_create_unix);
+
 	return &this->public;
 }