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/*
* Ouroboros - Copyright (C) 2016 - 2017
*
* A simple echo application
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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., http://www.fsf.org/about/contact/.
*/
#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: echo-app [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");
}
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 SDU.\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 SDU.\n");
flow_dealloc(fd);
continue;
}
flow_dealloc(fd);
}
return 0;
}
int client_main(void)
{
int fd = 0;
char buf[BUF_SIZE];
char * message = "Client says hi!";
ssize_t count = 0;
fd = flow_alloc("echo", 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 SDU.\n");
flow_dealloc(fd);
return -1;
}
count = flow_read(fd, buf, BUF_SIZE);
if (count < 0) {
printf("Failed to read SDU.\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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