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/*
* Ouroboros - Copyright (C) 2016 - 2021
*
* A simple broadcast application
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its
* 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 HOLDER 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.
*/
#define _POSIX_C_SOURCE 199309L
#include <ouroboros/dev.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUF_SIZE 256
static void usage(void)
{
printf("Usage: obc [OPTION]...\n"
"Sends a message to a broadcast network\n\n"
" -n --name Name of the broadcast layer\n"
" -m --message A message to send\n"
" [-l, --listen Listen mode]\n"
" --help Display this help text and exit\n");
}
static int reader_main(const char * dst)
{
int fd;
char buf[BUF_SIZE];
printf("Starting a reader.\n");
fd = flow_join(dst, NULL, NULL);
if (fd < 0) {
printf("Failed to join broadcast.\n");
return -1;
}
printf("New flow.\n");
while (true) {
ssize_t count = flow_read(fd, &buf, BUF_SIZE);
if (count < 0) {
printf("Failed to read.\n");
flow_dealloc(fd);
break;
}
printf("Message is %.*s.\n", (int) count, buf);
}
return 0;
}
static int writer_main(const char * dst,
const char * message)
{
int fd = 0;
size_t len = strlen(message) + 1;
fd = flow_join(dst, NULL, NULL);
if (fd < 0) {
printf("Failed to join broadcast.\n");
return -1;
}
if (flow_write(fd, message, len) < 0) {
printf("Failed to write packet.\n");
flow_dealloc(fd);
return -1;
}
flow_dealloc(fd);
return 0;
}
int main(int argc,
char ** argv)
{
int ret = -1;
bool reader = false;
char * name = NULL;
char * msg = "Ouroboros multicast rocks!";
argc--;
argv++;
while (argc > 0) {
if (strcmp(*argv, "-l") == 0 ||
strcmp(*argv, "--listen") == 0) {
reader = true;
} else if (strcmp(*argv, "-n") == 0 ||
strcmp(*argv, "--name") == 0) {
name = *(argv + 1);
argc--;
argv++;
} else if (strcmp(*argv, "-m") == 0 ||
strcmp(*argv, "--message") == 0) {
msg = *(argv + 1);
argc--;
argv++;
} else {
usage();
return 0;
}
argc--;
argv++;
}
if (name == NULL) {
printf("Please specify a name.\n\n");
usage();
exit(EXIT_FAILURE);
}
if (reader)
ret = reader_main(name);
else
ret = writer_main(name, msg);
return ret;
}
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