From 6e3b643bdf5f96c63c65dd83cfe6e19161fa0724 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Mon, 29 Aug 2011 08:26:35 +0200
Subject: [PATCH] ntp_server: add debug program "run_ntp_server"

---
 .gitignore            |   1 +
 Makefile.am           |   7 +++
 test/run_ntp_server.c | 137 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 145 insertions(+)
 create mode 100644 test/run_ntp_server.c

diff --git a/.gitignore b/.gitignore
index 3e9936882..7aa22de09 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,3 +60,4 @@ test/run_normalize
 test/tmp
 test/run_inotify
 test/test_queue_priority
+test/run_ntp_server
diff --git a/Makefile.am b/Makefile.am
index ef16217ad..161d6a92b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -892,6 +892,7 @@ noinst_PROGRAMS = \
 	test/dump_playlist \
 	test/run_decoder \
 	test/read_tags \
+	test/run_ntp_server \
 	test/run_filter \
 	test/run_output \
 	test/run_convert \
@@ -1006,6 +1007,12 @@ test_read_tags_SOURCES = test/read_tags.c \
 	$(TAG_SRC) \
 	$(DECODER_SRC)
 
+test_run_ntp_server_CPPFLAGS = $(AM_CPPFLAGS)
+test_run_ntp_server_LDADD = $(MPD_LIBS) \
+	$(GLIB_LIBS)
+test_run_ntp_server_SOURCES = test/run_ntp_server.c \
+	src/ntp_server.c src/ntp_server.h
+
 test_run_filter_CPPFLAGS = $(AM_CPPFLAGS)
 test_run_filter_LDADD = $(MPD_LIBS) \
 	$(SAMPLERATE_LIBS) \
diff --git a/test/run_ntp_server.c b/test/run_ntp_server.c
new file mode 100644
index 000000000..bdee1fdcb
--- /dev/null
+++ b/test/run_ntp_server.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2003-2011 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"
+#include "ntp_server.h"
+
+#include <glib.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#ifdef WIN32
+#define WINVER 0x0501
+#include <ws2tcpip.h>
+#include <winsock.h>
+#else
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#endif
+
+static int bind_host(int sd, char *hostname, unsigned long ulAddr,
+		     unsigned short *port)
+{
+	struct sockaddr_in my_addr;
+	socklen_t nlen = sizeof(struct sockaddr);
+	struct hostent *h;
+
+	memset(&my_addr, 0, sizeof(my_addr));
+	/* use specified hostname */
+	if (hostname) {
+		/* get server IP address (no check if input is IP address or DNS name) */
+		h = gethostbyname(hostname);
+		if (h == NULL) {
+			if (strstr(hostname, "255.255.255.255") == hostname) {
+				my_addr.sin_addr.s_addr=-1;
+			} else {
+				if ((my_addr.sin_addr.s_addr = inet_addr(hostname)) == 0xFFFFFFFF) {
+					return -1;
+				}
+			}
+			my_addr.sin_family = AF_INET;
+		} else {
+			my_addr.sin_family = h->h_addrtype;
+			memcpy((char *) &my_addr.sin_addr.s_addr,
+			       h->h_addr_list[0], h->h_length);
+		}
+	} else {
+		// if hostname=NULL, use INADDR_ANY
+		if (ulAddr)
+			my_addr.sin_addr.s_addr = ulAddr;
+		else
+			my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+		my_addr.sin_family = AF_INET;
+	}
+
+	/* bind a specified port */
+	my_addr.sin_port = htons(*port);
+
+	if (bind(sd, (struct sockaddr *) &my_addr, sizeof(my_addr)) < 0) {
+		return -1;
+	}
+
+	if (*port == 0) {
+		getsockname(sd, (struct sockaddr *) &my_addr, &nlen);
+		*port = ntohs(my_addr.sin_port);
+	}
+
+	return 0;
+}
+
+static int
+open_udp_socket(char *hostname, unsigned short *port)
+{
+	int sd;
+	int size = 30000;
+
+	/* socket creation */
+	sd = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sd < 0) {
+		return -1;
+	}
+	if (setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (void *) &size, sizeof(size)) < 0) {
+		return -1;
+	}
+	if (bind_host(sd, hostname, 0, port)) {
+		close(sd);
+		return -1;
+	}
+
+	return sd;
+}
+
+int
+main(G_GNUC_UNUSED int argc, G_GNUC_UNUSED char **argv)
+{
+	struct ntp_server ntp;
+	ntp_server_init(&ntp);
+
+	ntp.fd = open_udp_socket(NULL, &ntp.port);
+	if (ntp.fd < 0) {
+		g_printerr("Failed to create UDP socket\n");
+		ntp_server_close(&ntp);
+		return EXIT_FAILURE;
+	}
+
+	while (true) {
+		struct timeval tv = {
+			.tv_sec = 1,
+			.tv_usec = 0,
+		};
+
+		ntp_server_check(&ntp, &tv);
+	}
+
+	ntp_server_close(&ntp);
+	return EXIT_SUCCESS;
+}