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/*
* Ouroboros - Copyright (C) 2016 - 2019
*
* A simple echo 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 <string.h>
#define BUF_SIZE 256
static void usage(void)
{
printf("Usage: oecho [OPTION]...\n"
"Sends an echo between a server and a client\n\n"
" -l, --listen Run in server mode\n"
" --help Display this help text and exit\n");
}
static int server_main(void)
{
int fd = 0;
char buf[BUF_SIZE];
ssize_t count = 0;
printf("Starting the server.\n");
while (true) {
fd = flow_accept(NULL, NULL);
if (fd < 0) {
printf("Failed to accept flow.\n");
break;
}
printf("New flow.\n");
count = flow_read(fd, &buf, BUF_SIZE);
if (count < 0) {
printf("Failed to read packet.\n");
flow_dealloc(fd);
continue;
}
printf("Message from client is %.*s.\n", (int) count, buf);
if (flow_write(fd, buf, count) == -1) {
printf("Failed to write packet.\n");
flow_dealloc(fd);
continue;
}
flow_dealloc(fd);
}
return 0;
}
static int client_main(void)
{
int fd = 0;
char buf[BUF_SIZE];
char * message = "Client says hi!";
ssize_t count = 0;
fd = flow_alloc("oecho", NULL, NULL);
if (fd < 0) {
printf("Failed to allocate flow.\n");
return -1;
}
if (flow_write(fd, message, strlen(message) + 1) < 0) {
printf("Failed to write packet.\n");
flow_dealloc(fd);
return -1;
}
count = flow_read(fd, buf, BUF_SIZE);
if (count < 0) {
printf("Failed to read packet.\n");
flow_dealloc(fd);
return -1;
}
printf("Server replied with %.*s\n", (int) count, buf);
flow_dealloc(fd);
return 0;
}
int main(int argc, char ** argv)
{
int ret = -1;
bool server = false;
argc--;
argv++;
while (argc > 0) {
if (strcmp(*argv, "-l") == 0 ||
strcmp(*argv, "--listen") == 0) {
server = true;
} else {
usage();
return 0;
}
argc--;
argv++;
}
if (server)
ret = server_main();
else
ret = client_main();
return ret;
}
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