/*      $OpenBSD: setsockopt2.c,v 1.5 2012/02/26 21:08:06 fgsch Exp $   */
/*
 * Federico G. Schwindt <fgsch@openbsd.org>, 2009. Public Domain.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <err.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "test.h"

/* resolution of the monotonic clock */
struct timespec mono_res;

static void
alarm_handler(int sig)
{
        _exit(NOTOK);
}

void
check_timeout(int s, int sec, struct timespec *to)
{
        struct timespec t1, t2, e;
        char buf[BUFSIZ];

        ASSERT(signal(SIGALRM, alarm_handler) != SIG_ERR);
        CHECKe(alarm(sec));
        CHECKe(clock_gettime(CLOCK_MONOTONIC, &t1));
        ASSERT(read(s, &buf, sizeof(buf)) == -1);
        CHECKe(clock_gettime(CLOCK_MONOTONIC, &t2));
        ASSERT(errno == EAGAIN);
        timespecsub(&t2, &t1, &e);

        /*
         * verify that the difference between the duration and the
         * timeout is less than the resolution of the clock
         */
        if (timespeccmp(&e, to, <))
                timespecsub(to, &e, &t1);
        else
                timespecsub(&e, to, &t1);
        ASSERT(timespeccmp(&t1, &mono_res, <=));
}

static void *
sock_connect(void *arg)
{
        struct sockaddr_in sin;
        struct timeval to;
        struct timespec ts;
        pid_t child_pid;
        int status;
        int s, s2, s3;

        CHECKe(clock_getres(CLOCK_MONOTONIC, &mono_res));
        CHECKe(s = socket(AF_INET, SOCK_STREAM, 0));
        CHECKe(s2 = dup(s));
        CHECKe(s3 = fcntl(s, F_DUPFD, s));
        bzero(&sin, sizeof(sin));
        sin.sin_family = AF_INET;
        sin.sin_len = sizeof(sin);
        sin.sin_port = htons(6544);
        sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        CHECKe(connect(s, (struct sockaddr *)&sin, sizeof(sin)));
        to.tv_sec = 2;
        to.tv_usec = 0.5 * 1e6;
        TIMEVAL_TO_TIMESPEC(&to, &ts);
        CHECKe(setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to)));
        CHECKe(child_pid = fork());
        if (child_pid == 0) {
                to.tv_sec = 1;
                to.tv_usec = 0.5 * 1e6;
                TIMEVAL_TO_TIMESPEC(&to, &ts);
                CHECKe(setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &to, sizeof(to)));
                check_timeout(s, 2, &ts);
                check_timeout(s2, 2, &ts);
                check_timeout(s3, 2, &ts);
                return (NULL);
        }
        sleep(2);
        ts.tv_sec = 1;  /* the fd timeout was changed in the child */
        check_timeout(s, 2, &ts);
        check_timeout(s2, 2, &ts);
        check_timeout(s3, 2, &ts);
        CHECKe(s2 = dup(s));
        CHECKe(s3 = fcntl(s, F_DUPFD, s));
        check_timeout(s2, 2, &ts);
        check_timeout(s3, 2, &ts);
        CHECKe(close(s));
        CHECKe(close(s2));
        CHECKe(close(s3));
        ASSERTe(wait(&status), == child_pid);
        ASSERT(WIFEXITED(status));
        CHECKr(WEXITSTATUS(status));
        return (NULL);
}

static void *
sock_accept(void *arg)
{
        pthread_t connect_thread;
        struct sockaddr_in sin;
        int s;

        CHECKe(s = socket(AF_INET, SOCK_STREAM, 0));
        bzero(&sin, sizeof(sin));
        sin.sin_family = AF_INET;
        sin.sin_len = sizeof(sin);
        sin.sin_port = htons(6544);
        sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        CHECKe(bind(s, (struct sockaddr *)&sin, sizeof(sin)));
        CHECKe(listen(s, 2));

        CHECKr(pthread_create(&connect_thread, NULL, sock_connect, NULL));
        CHECKr(pthread_join(connect_thread, NULL));
        return (NULL);
}

int
main(int argc, char **argv)
{
        pthread_t accept_thread;

        CHECKr(pthread_create(&accept_thread, NULL, sock_accept, NULL));
        CHECKr(pthread_join(accept_thread, NULL));
        SUCCEED;
}