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// SPDX-License-Identifier: GPL-2.0
#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <unistd.h>
static int child_pid;
static unsigned long timediff(struct timeval s, struct timeval e)
{
unsigned long s_us, e_us;
s_us = s.tv_sec * 1000000 + s.tv_usec;
e_us = e.tv_sec * 1000000 + e.tv_usec;
if (s_us > e_us)
return 0;
return e_us - s_us;
}
static void client(int port)
{
int sock = 0;
struct sockaddr_in addr, laddr;
socklen_t len = sizeof(laddr);
struct linger sl;
int flag = 1;
int buffer;
struct timeval start, end;
unsigned long lat, sum_lat = 0, nr_lat = 0;
while (1) {
gettimeofday(&start, NULL);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
error(-1, errno, "socket creation");
sl.l_onoff = 1;
sl.l_linger = 0;
if (setsockopt(sock, SOL_SOCKET, SO_LINGER, &sl, sizeof(sl)))
error(-1, errno, "setsockopt(linger)");
if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&flag, sizeof(flag)))
error(-1, errno, "setsockopt(nodelay)");
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
if (inet_pton(AF_INET, "127.0.0.1", &addr.sin_addr) <= 0)
error(-1, errno, "inet_pton");
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0)
error(-1, errno, "connect");
send(sock, &buffer, sizeof(buffer), 0);
if (read(sock, &buffer, sizeof(buffer)) == -1)
error(-1, errno, "waiting read");
gettimeofday(&end, NULL);
lat = timediff(start, end);
sum_lat += lat;
nr_lat++;
if (lat < 100000)
goto close;
if (getsockname(sock, (struct sockaddr *)&laddr, &len) == -1)
error(-1, errno, "getsockname");
printf("port: %d, lat: %lu, avg: %lu, nr: %lu\n",
ntohs(laddr.sin_port), lat,
sum_lat / nr_lat, nr_lat);
close:
fflush(stdout);
close(sock);
}
}
static void server(int sock, struct sockaddr_in address)
{
int accepted;
int addrlen = sizeof(address);
int buffer;
while (1) {
accepted = accept(sock, (struct sockaddr *)&address,
(socklen_t *)&addrlen);
if (accepted < 0)
error(-1, errno, "accept");
if (read(accepted, &buffer, sizeof(buffer)) == -1)
error(-1, errno, "read");
close(accepted);
}
}
static void sig_handler(int signum)
{
kill(SIGTERM, child_pid);
exit(0);
}
int main(int argc, char const *argv[])
{
int sock;
int opt = 1;
struct sockaddr_in address;
struct sockaddr_in laddr;
socklen_t len = sizeof(laddr);
if (signal(SIGTERM, sig_handler) == SIG_ERR)
error(-1, errno, "signal");
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
error(-1, errno, "socket");
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
&opt, sizeof(opt)) == -1)
error(-1, errno, "setsockopt");
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
/* dynamically allocate unused port */
address.sin_port = 0;
if (bind(sock, (struct sockaddr *)&address, sizeof(address)) < 0)
error(-1, errno, "bind");
if (listen(sock, 3) < 0)
error(-1, errno, "listen");
if (getsockname(sock, (struct sockaddr *)&laddr, &len) == -1)
error(-1, errno, "getsockname");
fprintf(stderr, "server port: %d\n", ntohs(laddr.sin_port));
child_pid = fork();
if (!child_pid)
client(ntohs(laddr.sin_port));
else
server(sock, laddr);
return 0;
}
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