126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
/*
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* Copyright (c) 2004, Matthew P. Cashdollar <mpc@innographx.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the author nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "sam.h"
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static void dgramback(sam_pubkey_t dest, void *data, size_t size);
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static void diedback(void);
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static void logback(char *s);
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static void namingback(char *name, sam_pubkey_t pubkey, samerr_t result);
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/*
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* This is an extremely simple echo client which shows you how LibSAM
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* datagrams work. We lookup the name 'dgram-server' then send some data to
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* him. If everything works, we should get the same data back.
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*/
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int main(int argc, char* argv[])
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{
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samerr_t rc;
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char errstr[SAM_ERRMSG_LEN];
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/* Hook up the callback functions */
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sam_dgramback = &dgramback;
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sam_diedback = &diedback;
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sam_logback = &logback;
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sam_namingback = &namingback;
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/* Connect to the SAM server */
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rc = sam_connect("localhost", 7656, "dgram-client", SAM_DGRAM, 0);
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if (rc != SAM_OK) {
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fprintf(stderr, "SAM connection failed: %s\n", sam_strerror(rc));
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exit(1);
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}
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/*
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* This is equivalent to doing a DNS lookup on the normal internet. Note
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* that the dgram-server must already be running for this to work.
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* When the lookup completes, we send them some data (see namingback()).
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*/
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sam_naming_lookup("dgram-server");
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/*
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* Wait for something to happen, then invoke the appropriate callback
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*/
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while (true)
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sam_read_buffer();
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return 0;
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}
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/*
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* When we receive some data, print it out to the screen
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*/
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static void dgramback(sam_pubkey_t dest, void *data, size_t size)
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{
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printf("Datagram received: %s\n", (char *)data);
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free(data);
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}
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/*
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* This is called whenever the SAM connection fails (like if the I2P router is
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* shut down)
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*/
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static void diedback(void)
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{
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fprintf(stderr, "Lost SAM connection!\n");
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exit(1);
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}
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/*
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* The logging callback prints any logging messages from LibSAM
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*/
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static void logback(char *s)
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{
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fprintf(stderr, "LibSAM: %s\n", s);
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}
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/*
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* When a name is resolved, send data to that destination address
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*/
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static void namingback(char *name, sam_pubkey_t pubkey, samerr_t result)
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{
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char *data = "Hello, invisible world!";
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printf("I got %s's base 64 destination, so now I will send him some " \
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"data...\n", name);
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sam_dgram_send(pubkey, data, strlen(data));
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/*
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* ^^^ An extra NUL is appended to the data by LibSAM, so it is not
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* necessary to send trailing NULs over the wire for strings. This doesn't
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* cause problems with binary data, because the NUL isn't included in `size'
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* in sam_dgramback().
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* That is why we use strlen(data) instead of strlen(data) + 1.
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*/
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puts("Datagram sent");
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}
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