/*-
* Copyright (c) 2004 Robert N. M. Watson
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* tcpstream sets up a simple TCP client and server, and then streams a
* predictable pseudo-random byte sequence through it using variable block
* sizes. The intent is to detect corruption of data in the TCP stream.
*/
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAX_LOOPS 10240
#define MAX_LONGS 1024
static void
usage(void)
{
fprintf(stderr, "tcpstream client [ip] [port] [seed]\n");
fprintf(stderr, "tcpstream server [port] [seed]\n");
exit(-1);
}
static void
fill_buffer(long *buffer, int len)
{
int i;
for (i = 0; i < len; i++)
buffer[i] = htonl(random());
}
static int
check_buffer(long *buffer, int len)
{
int i;
for (i = 0; i < len; i++) {
if (buffer[i] != htonl(random()))
return (0);
}
return (1);
}
static void
tcpstream_client(struct sockaddr_in sin, long seed)
{
long buffer[MAX_LONGS];
ssize_t len;
int i, j, sock;
srandom(seed);
sock = socket(PF_INET, SOCK_STREAM, 0);
if (sock == -1)
errx(-1, "socket: %s", strerror(errno));
if (connect(sock, (struct sockaddr *) &sin, sizeof(sin)) == -1)
errx(-1, "connect: %s", strerror(errno));
for (j = 0; j < MAX_LOOPS; j++) {
for (i = 0; i < MAX_LONGS; i++) {
fill_buffer(buffer, i);
len = send(sock, buffer, i * sizeof(long), 0);
if (len == -1) {
printf("%d bytes written of %d expected\n",
len, i * sizeof(long));
fflush(stdout);
perror("send");
goto done;
}
}
}
done:
close(sock);
}
static void
tcpstream_server(struct sockaddr_in sin, long seed)
{
int i, j, listen_sock, accept_sock;
struct sockaddr_in other_sin;
long buffer[MAX_LONGS];
socklen_t addrlen;
ssize_t len;
int input_byte_counter;
listen_sock = socket(PF_INET, SOCK_STREAM, 0);
if (listen_sock == -1)
errx(-1, "socket: %s", strerror(errno));
if (bind(listen_sock, (struct sockaddr *)&sin, sizeof(sin)) == -1)
errx(-1, "bind: %s", strerror(errno));
if (listen(listen_sock, -1) == -1)
errx(-1, "listen: %s", strerror(errno));
while (1) {
bzero(&other_sin, sizeof(other_sin));
addrlen = sizeof(other_sin);
accept_sock = accept(listen_sock, (struct sockaddr *)
&other_sin, &addrlen);
if (accept_sock == -1) {
perror("accept");
continue;
}
printf("connection opened from %s:%d\n",
inet_ntoa(other_sin.sin_addr), ntohs(other_sin.sin_port));
input_byte_counter = 0;
srandom(seed);
for (j = 0; j < MAX_LOOPS; j++) {
for (i = 0; i < MAX_LONGS; i++) {
len = recv(accept_sock, buffer,
i * sizeof(long), MSG_WAITALL);
if (len != i * sizeof(long)) {
perror("recv");
goto done;
}
if (check_buffer(buffer, i) == 0) {
fprintf(stderr,
"Corruption in block beginning %d and ending %d\n", input_byte_counter,
input_byte_counter + len);
fprintf(stderr,
"Block size %d\n", i * sizeof(long));
goto done;
}
input_byte_counter += len;
}
}
done:
printf("connection closed\n");
close(accept_sock);
}
}
int
main(int argc, char *argv[])
{
struct sockaddr_in sin;
long port, seed;
char *dummy;
if (argc < 2)
usage();
if (strcmp(argv[1], "client") == 0) {
if (argc != 5)
usage();
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
if (inet_aton(argv[2], &sin.sin_addr) != 1)
errx(-1, "%s: %s", argv[2], strerror(EINVAL));
port = strtoul(argv[3], &dummy, 10);
if (port < 1 || port > 65535 || *dummy != '\0')
usage();
sin.sin_port = htons(port);
seed = strtoul(argv[4], &dummy, 10);
if (*dummy != '\0')
usage();
tcpstream_client(sin, seed);
} else if (strcmp(argv[1], "server") == 0) {
if (argc != 4)
usage();
bzero(&sin, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
port = strtoul(argv[2], &dummy, 10);
if (port < 1 || port > 65535 || *dummy != '\0')
usage();
sin.sin_port = htons(port);
seed = strtoul(argv[3], &dummy, 10);
if (*dummy != '\0')
usage();
tcpstream_server(sin, seed);
} else
usage();
return (0);
}
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