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In the tcpdrop regression test, allow the kernel to allocate us a port

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rather than using a fixed port number.  This means that the regression test
can be run many times in a row without waiting on TIMEWAIT to release a
hard-coded port number.

MFC after:	3 days
Sponsored by:	Juniper Networks, Inc.
This commit is contained in:
Robert Watson 2011-05-30 09:04:35 +00:00
parent 27d36ca1a8
commit e8c546028b
1 changed files with 44 additions and 37 deletions
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81
tools/regression/netinet/tcpdrop/tcpdrop.c
View file

@ -1,7 +1,11 @@
/*-
* Copyright (c) 2006 Robert N. M. Watson
* Copyright (c) 2011 Juniper Networks, Inc.
* All rights reserved.
*
* Portions of this software were developed by Robert N. M. Watson under
* contract to Juniper Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
@ -46,8 +50,6 @@
#include <string.h>
#include <unistd.h>
#define TCP_PORT 9001
static int
tcp_drop(struct sockaddr_in *sin_local, struct sockaddr_in *sin_remote)
{
@ -66,41 +68,12 @@ tcp_drop(struct sockaddr_in *sin_local, struct sockaddr_in *sin_remote)
}
static void
tcp_server(pid_t partner)
tcp_server(pid_t partner, int listen_fd)
{
int error, listen_fd, accept_fd;
struct sockaddr_in sin;
int error, accept_fd;
ssize_t len;
char ch;
listen_fd = socket(PF_INET, SOCK_STREAM, 0);
if (listen_fd < 0) {
error = errno;
(void)kill(partner, SIGTERM);
errno = error;
err(-1, "tcp_server: socket");
}
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
sin.sin_port = htons(TCP_PORT);
if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
error = errno;
(void)kill(partner, SIGTERM);
errno = error;
err(-1, "tcp_server: bind");
}
if (listen(listen_fd, -1) < 0) {
error = errno;
(void)kill(partner, SIGTERM);
errno = error;
err(-1, "tcp_server: listen");
}
accept_fd = accept(listen_fd, NULL, NULL);
if (accept_fd < 0) {
error = errno;
@ -146,7 +119,7 @@ tcp_server(pid_t partner)
}
static void
tcp_client(pid_t partner)
tcp_client(pid_t partner, u_short port)
{
struct sockaddr_in sin, sin_local;
int error, sock;
@ -168,7 +141,7 @@ tcp_client(pid_t partner)
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_addr.s_addr = ntohl(INADDR_LOOPBACK);
sin.sin_port = htons(TCP_PORT);
sin.sin_port = port;
if (connect(sock, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
error = errno;
@ -230,6 +203,40 @@ int
main(int argc, char *argv[])
{
pid_t child_pid, parent_pid;
struct sockaddr_in sin;
int listen_fd;
u_short port;
socklen_t len;
listen_fd = socket(PF_INET, SOCK_STREAM, 0);
if (listen_fd < 0)
err(-1, "socket");
/*
* We use the loopback, but let the kernel select a port for the
* server socket.
*/
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0)
err(-1, "bind");
if (listen(listen_fd, -1) < 0)
err(-1, "listen");
/*
* Query the port so that the client can use it.
*/
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
if (getsockname(listen_fd, (struct sockaddr *)&sin, &len) < 0)
err(-1, "getsockname");
port = sin.sin_port;
printf("Using port %d\n", ntohs(port));
if (signal(SIGCHLD, SIG_IGN) == SIG_ERR)
err(-1, "signal");
@ -240,9 +247,9 @@ main(int argc, char *argv[])
err(-1, "fork");
if (child_pid == 0) {
child_pid = getpid();
tcp_server(parent_pid);
tcp_server(parent_pid, listen_fd);
} else
tcp_client(child_pid);
tcp_client(child_pid, port);
return (0);
}