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-rw-r--r--src/event/ServerSocket.cxx485
1 files changed, 485 insertions, 0 deletions
diff --git a/src/event/ServerSocket.cxx b/src/event/ServerSocket.cxx
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index 000000000..a1e2ee01e
--- /dev/null
+++ b/src/event/ServerSocket.cxx
@@ -0,0 +1,485 @@
+/*
+ * 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
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+
+#ifdef HAVE_STRUCT_UCRED
+#define _GNU_SOURCE 1
+#endif
+
+#include "ServerSocket.hxx"
+#include "SocketUtil.hxx"
+#include "SocketError.hxx"
+#include "event/SocketMonitor.hxx"
+#include "resolver.h"
+#include "fd_util.h"
+
+#include <forward_list>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#ifdef WIN32
+#include <ws2tcpip.h>
+#include <winsock.h>
+#else
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netdb.h>
+#endif
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "listen"
+
+#define DEFAULT_PORT 6600
+
+struct OneServerSocket final : private SocketMonitor {
+ const server_socket &parent;
+
+ const unsigned serial;
+
+ char *path;
+
+ size_t address_length;
+ struct sockaddr *address;
+
+ OneServerSocket(EventLoop &_loop, const server_socket &_parent,
+ unsigned _serial,
+ const struct sockaddr *_address,
+ size_t _address_length)
+ :SocketMonitor(_loop),
+ parent(_parent), serial(_serial),
+ 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() {
+ g_free(path);
+ g_free(address);
+ }
+
+ bool Open(GError **error_r);
+
+ using SocketMonitor::Close;
+
+ char *ToString() const;
+
+ void SetFD(int _fd) {
+ SocketMonitor::Open(_fd);
+ SocketMonitor::ScheduleRead();
+ }
+
+ void Accept();
+
+private:
+ virtual bool OnSocketReady(unsigned flags) override;
+};
+
+struct server_socket {
+ EventLoop &loop;
+
+ server_socket_callback_t callback;
+ void *callback_ctx;
+
+ std::forward_list<OneServerSocket> sockets;
+
+ unsigned next_serial;
+
+ server_socket(EventLoop &_loop,
+ server_socket_callback_t _callback, void *_callback_ctx)
+ :loop(_loop),
+ callback(_callback), callback_ctx(_callback_ctx),
+ next_serial(1) {}
+
+ void Close();
+};
+
+static GQuark
+server_socket_quark(void)
+{
+ return g_quark_from_static_string("server_socket");
+}
+
+struct server_socket *
+server_socket_new(EventLoop &loop,
+ server_socket_callback_t callback, void *callback_ctx)
+{
+ return new server_socket(loop, callback, callback_ctx);
+}
+
+void
+server_socket_free(struct server_socket *ss)
+{
+ delete ss;
+}
+
+/**
+ * Wraper for sockaddr_to_string() which never fails.
+ */
+char *
+OneServerSocket::ToString() const
+{
+ char *p = sockaddr_to_string(address, address_length, nullptr);
+ if (p == nullptr)
+ p = g_strdup("[unknown]");
+ return p;
+}
+
+static int
+get_remote_uid(int fd)
+{
+#ifdef HAVE_STRUCT_UCRED
+ struct ucred cred;
+ socklen_t len = sizeof (cred);
+
+ if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0)
+ return 0;
+
+ return cred.uid;
+#else
+#ifdef HAVE_GETPEEREID
+ uid_t euid;
+ gid_t egid;
+
+ if (getpeereid(fd, &euid, &egid) == 0)
+ return euid;
+#else
+ (void)fd;
+#endif
+ return -1;
+#endif
+}
+
+inline void
+OneServerSocket::Accept()
+{
+ struct sockaddr_storage peer_address;
+ size_t peer_address_length = sizeof(peer_address);
+ int peer_fd =
+ accept_cloexec_nonblock(Get(), (struct sockaddr*)&peer_address,
+ &peer_address_length);
+ if (peer_fd < 0) {
+ const SocketErrorMessage msg;
+ g_warning("accept() failed: %s", (const char *)msg);
+ return;
+ }
+
+ if (socket_keepalive(peer_fd)) {
+ const SocketErrorMessage msg;
+ g_warning("Could not set TCP keepalive option: %s",
+ (const char *)msg);
+ }
+
+ parent.callback(peer_fd,
+ (const struct sockaddr*)&peer_address,
+ peer_address_length, get_remote_uid(peer_fd),
+ parent.callback_ctx);
+}
+
+bool
+OneServerSocket::OnSocketReady(gcc_unused unsigned flags)
+{
+ Accept();
+ return true;
+}
+
+inline bool
+OneServerSocket::Open(GError **error_r)
+{
+ assert(!IsDefined());
+
+ 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 OneServerSocket *good = nullptr, *bad = nullptr;
+ GError *last_error = nullptr;
+
+ for (auto &i : ss->sockets) {
+ assert(i.serial > 0);
+ assert(good == nullptr || i.serial <= good->serial);
+
+ if (bad != nullptr && i.serial != bad->serial) {
+ server_socket_close(ss);
+ g_propagate_error(error_r, last_error);
+ return false;
+ }
+
+ 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)",
+ address_string, error->message,
+ good_string);
+ g_free(address_string);
+ g_free(good_string);
+ g_error_free(error);
+ } else if (bad == nullptr) {
+ bad = &i;
+
+ char *address_string = i.ToString();
+ g_propagate_prefixed_error(&last_error, error,
+ "Failed to bind to '%s': ",
+ address_string);
+ g_free(address_string);
+ } else
+ g_error_free(error);
+ continue;
+ }
+
+ /* mark this socket as "good", and clear previous
+ errors */
+
+ good = &i;
+
+ if (bad != nullptr) {
+ bad = nullptr;
+ g_error_free(last_error);
+ last_error = nullptr;
+ }
+ }
+
+ if (bad != nullptr) {
+ server_socket_close(ss);
+ g_propagate_error(error_r, last_error);
+ return false;
+ }
+
+ return true;
+}
+
+void
+server_socket::Close()
+{
+ for (auto &i : sockets)
+ i.Close();
+}
+
+void
+server_socket_close(struct server_socket *ss)
+{
+ ss->Close();
+}
+
+static OneServerSocket &
+server_socket_add_address(struct server_socket *ss,
+ const struct sockaddr *address,
+ size_t address_length)
+{
+ assert(ss != nullptr);
+
+ ss->sockets.emplace_front(ss->loop, *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 != nullptr);
+ assert(fd >= 0);
+
+ struct sockaddr_storage address;
+ socklen_t address_length;
+ if (getsockname(fd, (struct sockaddr *)&address,
+ &address_length) < 0) {
+ SetSocketError(error_r);
+ g_prefix_error(error_r, "Failed to get socket address");
+ return false;
+ }
+
+ OneServerSocket &s =
+ server_socket_add_address(ss, (struct sockaddr *)&address,
+ address_length);
+ s.SetFD(fd);
+
+ return true;
+}
+
+#ifdef HAVE_TCP
+
+/**
+ * Add a listener on a port on all IPv4 interfaces.
+ *
+ * @param port the TCP port
+ */
+static void
+server_socket_add_port_ipv4(struct server_socket *ss, unsigned port)
+{
+ struct sockaddr_in sin;
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_port = htons(port);
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = INADDR_ANY;
+
+ server_socket_add_address(ss, (const struct sockaddr *)&sin,
+ sizeof(sin));
+}
+
+#ifdef HAVE_IPV6
+/**
+ * Add a listener on a port on all IPv6 interfaces.
+ *
+ * @param port the TCP port
+ */
+static void
+server_socket_add_port_ipv6(struct server_socket *ss, unsigned port)
+{
+ struct sockaddr_in6 sin;
+ memset(&sin, 0, sizeof(sin));
+ sin.sin6_port = htons(port);
+ sin.sin6_family = AF_INET6;
+
+ server_socket_add_address(ss, (const struct sockaddr *)&sin,
+ sizeof(sin));
+}
+#endif /* HAVE_IPV6 */
+
+#endif /* HAVE_TCP */
+
+bool
+server_socket_add_port(struct server_socket *ss, unsigned port,
+ GError **error_r)
+{
+#ifdef HAVE_TCP
+ if (port == 0 || port > 0xffff) {
+ g_set_error(error_r, server_socket_quark(), 0,
+ "Invalid TCP port");
+ return false;
+ }
+
+#ifdef HAVE_IPV6
+ server_socket_add_port_ipv6(ss, port);
+#endif
+ server_socket_add_port_ipv4(ss, port);
+
+ ++ss->next_serial;
+
+ return true;
+#else /* HAVE_TCP */
+ (void)ss;
+ (void)port;
+
+ g_set_error(error_r, server_socket_quark(), 0,
+ "TCP support is disabled");
+ return false;
+#endif /* HAVE_TCP */
+}
+
+bool
+server_socket_add_host(struct server_socket *ss, const char *hostname,
+ unsigned port, GError **error_r)
+{
+#ifdef HAVE_TCP
+ struct addrinfo *ai = resolve_host_port(hostname, port,
+ AI_PASSIVE, SOCK_STREAM,
+ error_r);
+ if (ai == nullptr)
+ return false;
+
+ 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);
+
+ ++ss->next_serial;
+
+ return true;
+#else /* HAVE_TCP */
+ (void)ss;
+ (void)hostname;
+ (void)port;
+
+ g_set_error(error_r, server_socket_quark(), 0,
+ "TCP support is disabled");
+ return false;
+#endif /* HAVE_TCP */
+}
+
+bool
+server_socket_add_path(struct server_socket *ss, const char *path,
+ GError **error_r)
+{
+#ifdef HAVE_UN
+ struct sockaddr_un s_un;
+
+ size_t path_length = strlen(path);
+ if (path_length >= sizeof(s_un.sun_path)) {
+ g_set_error(error_r, server_socket_quark(), 0,
+ "UNIX socket path is too long");
+ return false;
+ }
+
+ unlink(path);
+
+ s_un.sun_family = AF_UNIX;
+ memcpy(s_un.sun_path, path, path_length + 1);
+
+ OneServerSocket &s =
+ server_socket_add_address(ss, (const struct sockaddr *)&s_un,
+ sizeof(s_un));
+ s.path = g_strdup(path);
+
+ return true;
+#else /* !HAVE_UN */
+ (void)ss;
+ (void)path;
+
+ g_set_error(error_r, server_socket_quark(), 0,
+ "UNIX domain socket support is disabled");
+ return false;
+#endif /* !HAVE_UN */
+}
+