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Date: Wed, 26 Feb 2003 20:32:36 +1100
From: Tim Robbins <tjr@freebsd.org>
To: current@freebsd.org
Subject: TCP is still broken
Message-ID: <20030226203236.A45378@dilbert.robbins.dropbear.id.au>
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This program, based on one from the Apache 2 configure script, still causes
-current to lock up solid despite the recent bug fixes to the tcptw code.
Explicitly closing connected_s before returning from main() seems to avoid
the problem.

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
int main(void) {
    int listen_s, connected_s, client_s;
    int listen_port, rc;
    struct sockaddr_in sa;
    socklen_t sa_len;
    socklen_t option_len;
    int option;

    listen_s = socket(AF_INET, SOCK_STREAM, 0);
    if (listen_s < 0) {
        perror("socket");
        exit(1);
    }
    memset(&sa, 0, sizeof sa);
    sa.sin_family = AF_INET;
    /* leave port 0 to get ephemeral */
    rc = bind(listen_s, (struct sockaddr *)&sa, sizeof sa);
    if (rc < 0) {
        perror("bind for ephemeral port");
        exit(1);
    }
    /* find ephemeral port */
    sa_len = sizeof(sa);
    rc = getsockname(listen_s, (struct sockaddr *)&sa, &sa_len);
    if (rc < 0) {
        perror("getsockname");
        exit(1);
    }
    listen_port = sa.sin_port;
    rc = listen(listen_s, 5);
    if (rc < 0) {
        perror("listen");
        exit(1);
    }
    client_s = socket(AF_INET, SOCK_STREAM, 0);
    if (client_s < 0) {
        perror("socket");
        exit(1);
    }
    memset(&sa, 0, sizeof sa);
    sa.sin_family = AF_INET;
    sa.sin_port   = listen_port;
    /* leave sin_addr all zeros to use loopback */
    rc = connect(client_s, (struct sockaddr *)&sa, sizeof sa);
    if (rc < 0) {
        perror("connect");
        exit(1);
    }
    sa_len = sizeof sa;
    connected_s = accept(listen_s, (struct sockaddr *)&sa, &sa_len);
    if (connected_s < 0) {
        perror("accept");
        exit(1);
    }
    return 0;
}

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