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/* $OpenBSD: gen_traffic.c,v 1.2 2016/10/26 14:06:33 bluhm Exp $ */
/*
* Copyright (c) 2013 Florian Obser <florian@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/wait.h>
#include <err.h>
#include <ctype.h>
#include <errno.h>
#include <event.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
__dead void usage(void);
void gen_traffic_paused(int, short, void*);
void gen_traffic_accept(int, short, void*);
void gen_traffic_request(int, short, void*);
void gen_traffic_write(int, short, void*);
void gen_traffic_sender_paused(int, short, void*);
struct listener {
struct event ev, pause;
};
struct reader {
struct event ev;
int fd;
};
struct sender {
struct event ev, pause;
int fd;
};
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s 4|6\n", __progname);
exit(1);
}
int on = 1;
int
main(int argc, char *argv[])
{
struct addrinfo hints, *sender_res, *server_res;
struct listener *l;
struct sender *sender;
char *ip;
int error, s;
if (argc != 2)
usage();
if (strncmp(argv[1], "4", 1) == 0)
ip = "10.11.12.13";
else if (strncmp(argv[1], "6", 1) == 0)
ip = "2001:db8::13";
else
usage();
event_init();
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(ip, "12346", &hints, &server_res);
if (error)
errx(1, "%s", gai_strerror(error));
s = socket(server_res->ai_family, server_res->ai_socktype,
server_res->ai_protocol);
if (s == -1)
err(1, "%s", "bind");
if (bind(s, server_res->ai_addr, server_res->ai_addrlen) < 0)
err(1, "%s", "bind");
if (ioctl(s, FIONBIO, &on) == -1)
err(1, "%s", "listener ioctl(FIONBIO)");
if (listen(s, 5) == -1)
err(1, "%s", "listen");
l = calloc(1, sizeof(*l));
if (l == NULL)
errx(1, "calloc");
event_set(&l->ev, s, EV_READ | EV_PERSIST, gen_traffic_accept, l);
event_add(&l->ev, NULL);
evtimer_set(&l->pause, gen_traffic_paused, l);
error = getaddrinfo(ip, "12345", &hints, &sender_res);
if (error)
errx(1, "%s", gai_strerror(error));
s = socket(sender_res->ai_family, sender_res->ai_socktype,
sender_res->ai_protocol);
if (s == -1)
err(1, "%s", "bind");
if (bind(s, sender_res->ai_addr, sender_res->ai_addrlen) < 0)
err(1, "%s", "bind");
if (ioctl(s, FIONBIO, &on) == -1)
err(1, "%s", "sender ioctl(FIONBIO)");
sender = calloc(1, sizeof(*sender));
if (sender == NULL)
errx(1, "calloc");
if (connect(s, server_res->ai_addr, server_res->ai_addrlen) == -1 &&
errno != EINPROGRESS)
err(1, "%s", "connect");
event_set(&sender->ev, s, EV_WRITE | EV_PERSIST, gen_traffic_write,
sender);
event_add(&sender->ev, NULL);
evtimer_set(&sender->pause, gen_traffic_sender_paused, sender);
event_dispatch();
exit(0);
}
void
gen_traffic_paused(int fd, short events, void *arg)
{
struct listener *l = arg;
event_add(&l->ev, NULL);
}
void
gen_traffic_sender_paused(int fd, short events, void *arg)
{
struct sender *s = arg;
event_add(&s->ev, NULL);
}
void
gen_traffic_accept(int fd, short events, void *arg)
{
struct listener *l;
struct sockaddr_storage ss;
struct timeval pause;
struct reader *r;
socklen_t len;
int s;
l = arg;
pause.tv_sec = 1; pause.tv_usec = 0;
len = sizeof(ss);
s = accept(fd, (struct sockaddr *)&ss, &len);
if (s == -1) {
switch (errno) {
case EINTR:
case EWOULDBLOCK:
case ECONNABORTED:
return;
case EMFILE:
case ENFILE:
event_del(&l->ev);
evtimer_add(&l->pause, &pause);
return;
default:
err(1, "%s", "accept");
}
}
if (ioctl(s, FIONBIO, &on) == -1)
err(1, "%s", "reader ioctl(FIONBIO)");
r = calloc(1, sizeof(*r));
if (r == NULL)
errx(1, "%s", "cannot calloc reader");
r->fd = s;
event_set(&r->ev, s, EV_READ | EV_PERSIST, gen_traffic_request, r);
event_add(&r->ev, NULL);
}
void
gen_traffic_request(int fd, short events, void *arg)
{
static size_t total = 0;
struct reader *r;
size_t n;
uint8_t buf[4096];
r = arg;
n = read(fd, buf, 4096);
switch (n) {
case -1:
switch (errno) {
case EINTR:
case EAGAIN:
return;
default:
err(1, "%s", "read");
}
break;
case 0:
event_del(&r->ev);
close(fd);
break;
default:
total += n;
/* warnx("read: %lld - %lld", n, total); */
break;
}
if (total == 10 * 4096) {
/* warnx("done %lld", total); */
exit(0);
}
}
void
gen_traffic_write(int fd, short events, void *arg)
{
static int count = 0;
struct timeval pause;
struct sender *s;
uint8_t buf[4096];
s = arg;
pause.tv_sec = 1;
pause.tv_usec = 0;
event_del(&s->ev);
if (count++ >= 10) {
/* warnx("%s", "done writing"); */
close(fd);
return;
}
if (write(fd, buf, 4096) == -1)
err(1, "%s", "write");
evtimer_add(&s->pause, &pause);
}
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