LibSAM

apps/sam/c/examples/dgram-server.c

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+/*
+ * Copyright (c) 2004, Matthew P. Cashdollar <mpc@innographx.com>
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the author nor the names of any contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "sam.h"
+
+static void dgramback(sam_pubkey_t dest, void *data, size_t size);
+static void diedback(void);
+static void logback(char *s);
+static void namingback(char *name, sam_pubkey_t pubkey, samerr_t result);
+
+/*
+ * This is an extremely simple echo server which shows you how LibSAM
+ * datagrams work.  We echo back every datagram that is sent to us.
+ */
+int main(int argc, char* argv[])
+{
+	samerr_t rc;
+	char errstr[SAM_ERRMSG_LEN];
+
+	/* Hook up the callback functions */
+	sam_dgramback = &dgramback;
+	sam_diedback = &diedback;
+	sam_logback = &logback;
+	sam_namingback = &namingback;
+
+	/* Connect to the SAM server */
+	rc = sam_connect("127.0.0.1", 7656, "dgram-server", SAM_DGRAM, 0);
+	if (rc != SAM_OK) {
+		fprintf(stderr, "SAM connection failed: %s\n", sam_strerror(rc));
+		exit(1);
+	}
+
+	/*
+	 * At this point we just keep polling the buffer, which causes the
+	 * appropriate callbacks to be called whenever something happens
+	 */
+	while (true)
+		sam_read_buffer();
+
+	return 0;
+}
+
+/*
+ * When we receive some data, we just ECHO the exact same data back to them
+ */
+static void dgramback(sam_pubkey_t dest, void *data, size_t size)
+{
+	puts("Echoing datagram");
+	sam_dgram_send(dest, data, size);
+	free(data);
+}
+
+/*
+ * This is called whenever the SAM connection fails (like if the I2P router is
+ * shut down)
+ */
+static void diedback(void)
+{
+	fprintf(stderr, "Lost SAM connection!\n");
+	exit(1);
+}
+
+/*
+ * The logging callback prints any logging messages from LibSAM
+ */
+static void logback(char *s)
+{
+	fprintf(stderr, "LibSAM: %s\n", s);
+}
+
+/*
+ * Not used, but the function has to be in the program anyway
+ */
+static void namingback(char *name, sam_pubkey_t pubkey, samerr_t result)
+{
+	assert(false);  /* we don't do any naming lookups in this program */
+}