server_socket: convert to C++

1 files changed, 145 insertions, 135 deletions

diff --git a/src/server_socket.c b/src/ServerSocket.cxx
index 396399596..7127d3bdb 100644
--- a/src/server_socket.c
+++ b/src/ServerSocket.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,12 +23,14 @@
 #define _GNU_SOURCE 1
 #endif
 
-#include "server_socket.h"
+#include "ServerSocket.hxx"
 #include "socket_util.h"
 #include "resolver.h"
 #include "fd_util.h"
 #include "glib_socket.h"
 
+#include <forward_list>
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -53,11 +55,10 @@
 
 #define DEFAULT_PORT	6600
 
-struct one_socket {
-	struct one_socket *next;
-	struct server_socket *parent;
+struct OneServerSocket {
+	const server_socket &parent;
 
-	unsigned serial;
+	const unsigned serial;
 
 	int fd;
 	guint source_id;
@@ -65,15 +66,52 @@ struct one_socket {
 	char *path;
 
 	size_t address_length;
-	struct sockaddr address;
+	struct sockaddr *address;
+
+	OneServerSocket(const server_socket &_parent, unsigned _serial,
+			const struct sockaddr *_address,
+			size_t _address_length)
+		:parent(_parent), serial(_serial),
+		 fd(-1),
+		 path(nullptr),
+		 address_length(_address_length),
+		 address((sockaddr *)g_memdup(_address, _address_length))
+	{
+		assert(_address != nullptr);
+		assert(_address_length > 0);
+	}
+
+	OneServerSocket(const OneServerSocket &other) = delete;
+	OneServerSocket &operator=(const OneServerSocket &other) = delete;
+
+	~OneServerSocket() {
+		Close();
+		g_free(path);
+		g_free(address);
+	}
+
+	bool Open(GError **error_r);
+
+	void Close();
+
+	char *ToString() const;
+
+	void SetFD(int fd);
 };
 
 struct server_socket {
 	server_socket_callback_t callback;
 	void *callback_ctx;
 
-	struct one_socket *sockets, **sockets_tail_r;
+	std::forward_list<OneServerSocket> sockets;
+
 	unsigned next_serial;
+
+	server_socket(server_socket_callback_t _callback, void *_callback_ctx)
+		:callback(_callback), callback_ctx(_callback_ctx),
+		 next_serial(1) {}
+
+	void Close();
 };
 
 static GQuark
@@ -85,41 +123,23 @@ server_socket_quark(void)
 struct server_socket *
 server_socket_new(server_socket_callback_t callback, void *callback_ctx)
 {
-	struct server_socket *ss = g_new(struct server_socket, 1);
-	ss->callback = callback;
-	ss->callback_ctx = callback_ctx;
-	ss->sockets = NULL;
-	ss->sockets_tail_r = &ss->sockets;
-	ss->next_serial = 1;
-	return ss;
+	return new server_socket(callback, callback_ctx);
 }
 
 void
 server_socket_free(struct server_socket *ss)
 {
-	server_socket_close(ss);
-
-	while (ss->sockets != NULL) {
-		struct one_socket *s = ss->sockets;
-		ss->sockets = s->next;
-
-		assert(s->fd < 0);
-
-		g_free(s->path);
-		g_free(s);
-	}
-
-	g_free(ss);
+	delete ss;
 }
 
 /**
  * Wraper for sockaddr_to_string() which never fails.
  */
-static char *
-one_socket_to_string(const struct one_socket *s)
+char *
+OneServerSocket::ToString() const
 {
-	char *p = sockaddr_to_string(&s->address, s->address_length, NULL);
-	if (p == NULL)
+	char *p = sockaddr_to_string(address, address_length, nullptr);
+	if (p == nullptr)
 		p = g_strdup("[unknown]");
 	return p;
 }
@@ -154,7 +174,7 @@ server_socket_in_event(G_GNUC_UNUSED GIOChannel *source,
 		       G_GNUC_UNUSED GIOCondition condition,
 		       gpointer data)
 {
-	struct one_socket *s = data;
+	OneServerSocket *s = (OneServerSocket *)data;
 
 	struct sockaddr_storage address;
 	size_t address_length = sizeof(address);
@@ -164,9 +184,9 @@ server_socket_in_event(G_GNUC_UNUSED GIOChannel *source,
 		if (socket_keepalive(fd))
 			g_warning("Could not set TCP keepalive option: %s",
 				  g_strerror(errno));
-		s->parent->callback(fd, (const struct sockaddr*)&address,
-				    address_length, get_remote_uid(fd),
-				    s->parent->callback_ctx);
+		s->parent.callback(fd, (const struct sockaddr*)&address,
+				   address_length, get_remote_uid(fd),
+				   s->parent.callback_ctx);
 	} else {
 		g_warning("accept() failed: %s", g_strerror(errno));
 	}
@@ -174,47 +194,65 @@ server_socket_in_event(G_GNUC_UNUSED GIOChannel *source,
 	return true;
 }
 
-static void
-set_fd(struct one_socket *s, int fd)
+void
+OneServerSocket::SetFD(int _fd)
 {
-	assert(s != NULL);
-	assert(s->fd < 0);
-	assert(fd >= 0);
+	assert(fd < 0);
+	assert(_fd >= 0);
 
-	s->fd = fd;
+	fd = _fd;
 
-	GIOChannel *channel = g_io_channel_new_socket(s->fd);
-	s->source_id = g_io_add_watch(channel, G_IO_IN,
-				      server_socket_in_event, s);
+	GIOChannel *channel = g_io_channel_new_socket(fd);
+	source_id = g_io_add_watch(channel, G_IO_IN,
+				   server_socket_in_event, this);
 	g_io_channel_unref(channel);
 }
 
+inline bool
+OneServerSocket::Open(GError **error_r)
+{
+	assert(fd < 0);
+
+	int _fd = socket_bind_listen(address->sa_family,
+				     SOCK_STREAM, 0,
+				     address, address_length, 5,
+				     error_r);
+	if (_fd < 0)
+		return false;
+
+	/* allow everybody to connect */
+
+	if (path != nullptr)
+		chmod(path, 0666);
+
+	/* register in the GLib main loop */
+
+	SetFD(_fd);
+
+	return true;
+}
+
 bool
 server_socket_open(struct server_socket *ss, GError **error_r)
 {
-	struct one_socket *good = NULL, *bad = NULL;
-	GError *last_error = NULL;
+	struct OneServerSocket *good = nullptr, *bad = nullptr;
+	GError *last_error = nullptr;
 
-	for (struct one_socket *s = ss->sockets; s != NULL; s = s->next) {
-		assert(s->serial > 0);
-		assert(good == NULL || s->serial >= good->serial);
-		assert(s->fd < 0);
+	for (auto &i : ss->sockets) {
+		assert(i.serial > 0);
+		assert(good == nullptr || i.serial <= good->serial);
 
-		if (bad != NULL && s->serial != bad->serial) {
+		if (bad != nullptr && i.serial != bad->serial) {
 			server_socket_close(ss);
 			g_propagate_error(error_r, last_error);
 			return false;
 		}
 
-		GError *error = NULL;
-		int fd = socket_bind_listen(s->address.sa_family,
-					    SOCK_STREAM, 0,
-					    &s->address, s->address_length, 5,
-					    &error);
-		if (fd < 0) {
-			if (good != NULL && good->serial == s->serial) {
-				char *address_string = one_socket_to_string(s);
-				char *good_string = one_socket_to_string(good);
+		GError *error = nullptr;
+		if (!i.Open(&error)) {
+			if (good != nullptr && good->serial == i.serial) {
+				char *address_string = i.ToString();
+				char *good_string = good->ToString();
 				g_warning("bind to '%s' failed: %s "
 					  "(continuing anyway, because "
 					  "binding to '%s' succeeded)",
@@ -223,10 +261,10 @@ server_socket_open(struct server_socket *ss, GError **error_r)
 				g_free(address_string);
 				g_free(good_string);
 				g_error_free(error);
-			} else if (bad == NULL) {
-				bad = s;
+			} else if (bad == nullptr) {
+				bad = &i;
 
-				char *address_string = one_socket_to_string(s);
+				char *address_string = i.ToString();
 				g_propagate_prefixed_error(&last_error, error,
 							   "Failed to bind to '%s': ",
 							   address_string);
@@ -236,28 +274,19 @@ server_socket_open(struct server_socket *ss, GError **error_r)
 			continue;
 		}
 
-		/* allow everybody to connect */
-
-		if (s->path != NULL)
-			chmod(s->path, 0666);
-
-		/* register in the GLib main loop */
-
-		set_fd(s, fd);
-
 		/* mark this socket as "good", and clear previous
 		   errors */
 
-		good = s;
+		good = &i;
 
-		if (bad != NULL) {
-			bad = NULL;
+		if (bad != nullptr) {
+			bad = nullptr;
 			g_error_free(last_error);
-			last_error = NULL;
+			last_error = nullptr;
 		}
 	}
 
-	if (bad != NULL) {
+	if (bad != nullptr) {
 		server_socket_close(ss);
 		g_propagate_error(error_r, last_error);
 		return false;
@@ -267,43 +296,46 @@ server_socket_open(struct server_socket *ss, GError **error_r)
 }
 
 void
-server_socket_close(struct server_socket *ss)
+OneServerSocket::Close()
 {
-	for (struct one_socket *s = ss->sockets; s != NULL; s = s->next) {
-		if (s->fd < 0)
-			continue;
+	if (fd < 0)
+		return;
 
-		g_source_remove(s->source_id);
-		close_socket(s->fd);
-		s->fd = -1;
-	}
+	g_source_remove(source_id);
+	close_socket(fd);
+	fd = -1;
+}
+
+void
+server_socket::Close()
+{
+	for (auto &i : sockets)
+		i.Close();
+}
+
+void
+server_socket_close(struct server_socket *ss)
+{
+	ss->Close();
 }
 
-static struct one_socket *
-one_socket_new(unsigned serial, const struct sockaddr *address,
-	       size_t address_length)
+static OneServerSocket &
+server_socket_add_address(struct server_socket *ss,
+			  const struct sockaddr *address,
+			  size_t address_length)
 {
-	assert(address != NULL);
-	assert(address_length > 0);
-
-	struct one_socket *s = g_malloc(sizeof(*s) - sizeof(s->address) +
-					address_length);
-	s->next = NULL;
-	s->serial = serial;
-	s->fd = -1;
-	s->path = NULL;
-	s->address_length = address_length;
-	memcpy(&s->address, address, address_length);
-
-	return s;
+	assert(ss != nullptr);
+
+	ss->sockets.emplace_front(*ss, ss->next_serial,
+				  address, address_length);
+
+	return ss->sockets.front();
 }
 
 bool
 server_socket_add_fd(struct server_socket *ss, int fd, GError **error_r)
 {
-	assert(ss != NULL);
-	assert(ss->sockets_tail_r != NULL);
-	assert(*ss->sockets_tail_r == NULL);
+	assert(ss != nullptr);
 	assert(fd >= 0);
 
 	struct sockaddr_storage address;
@@ -316,36 +348,14 @@ server_socket_add_fd(struct server_socket *ss, int fd, GError **error_r)
 		return false;
 	}
 
-	struct one_socket *s = one_socket_new(ss->next_serial,
-					      (struct sockaddr *)&address,
-					      address_length);
-	s->parent = ss;
-	*ss->sockets_tail_r = s;
-	ss->sockets_tail_r = &s->next;
-
-	set_fd(s, fd);
+	OneServerSocket &s =
+		server_socket_add_address(ss, (struct sockaddr *)&address,
+					  address_length);
+	s.SetFD(fd);
 
 	return true;
 }
 
-static struct one_socket *
-server_socket_add_address(struct server_socket *ss,
-			  const struct sockaddr *address,
-			  size_t address_length)
-{
-	assert(ss != NULL);
-	assert(ss->sockets_tail_r != NULL);
-	assert(*ss->sockets_tail_r == NULL);
-
-	struct one_socket *s = one_socket_new(ss->next_serial,
-					      address, address_length);
-	s->parent = ss;
-	*ss->sockets_tail_r = s;
-	ss->sockets_tail_r = &s->next;
-
-	return s;
-}
-
 #ifdef HAVE_TCP
 
 /**
@@ -424,10 +434,10 @@ server_socket_add_host(struct server_socket *ss, const char *hostname,
 	struct addrinfo *ai = resolve_host_port(hostname, port,
 						AI_PASSIVE, SOCK_STREAM,
 						error_r);
-	if (ai == NULL)
+	if (ai == nullptr)
 		return false;
 
-	for (const struct addrinfo *i = ai; i != NULL; i = i->ai_next)
+	for (const struct addrinfo *i = ai; i != nullptr; i = i->ai_next)
 		server_socket_add_address(ss, i->ai_addr, i->ai_addrlen);
 
 	freeaddrinfo(ai);
@@ -465,10 +475,10 @@ server_socket_add_path(struct server_socket *ss, const char *path,
 	s_un.sun_family = AF_UNIX;
 	memcpy(s_un.sun_path, path, path_length + 1);
 
-	struct one_socket *s =
+	OneServerSocket &s =
 		server_socket_add_address(ss, (const struct sockaddr *)&s_un,
 					  sizeof(s_un));
-	s->path = g_strdup(path);
+	s.path = g_strdup(path);
 
 	return true;
 #else /* !HAVE_UN */