Skip to content
This repository
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 112 lines (84 sloc) 3.026 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111
/* net.c - stupid boilerplate shit that I shouldn't have to write */

/* Copyright (C) 2007 Keith Rarick and Philotic Inc.

* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.

* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.

* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <errno.h>

#include "net.h"
#include "util.h"

static int listen_socket = -1;
static struct event listen_evq;
static evh accept_handler;
static time_t main_deadline = 0;
static int brakes_are_on = 1;

int
make_server_socket(struct in_addr host_addr, int port)
{
    int fd, flags, r;
    struct linger linger = {0, 0};
    struct sockaddr_in addr;

    fd = socket(AF_INET, SOCK_STREAM, 0);
    if (fd == -1) return twarn("socket()"), -1;

    flags = fcntl(fd, F_GETFL, 0);
    if (flags < 0) return twarn("getting flags"), close(fd), -1;

    r = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
    if (flags < 0) return twarn("setting O_NONBLOCK"), close(fd), -1;

    flags = 1;
    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof flags);
    setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, &flags, sizeof flags);
    setsockopt(fd, SOL_SOCKET, SO_LINGER, &linger, sizeof linger);
    setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &flags, sizeof flags);

    /*memset(&addr, 0, sizeof addr);*/

    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr = host_addr;
    r = bind(fd, (struct sockaddr *) &addr, sizeof addr);
    if (r == -1) return twarn("bind()"), close(fd), -1;

    r = listen(fd, 1024);
    if (r == -1) return twarn("listen()"), close(fd), -1;

    return listen_socket = fd;
}

void
brake()
{
    int r;

    if (brakes_are_on) return;
    brakes_are_on = 1;
    twarnx("too many connections; putting on the brakes");

    r = event_del(&listen_evq);
    if (r == -1) twarn("event_del()");

    r = listen(listen_socket, 0);
    if (r == -1) twarn("listen()");
}

void
unbrake(evh h)
{
    int r;

    if (!brakes_are_on) return;
    brakes_are_on = 0;
    twarnx("releasing the brakes");

    accept_handler = h ? : accept_handler;
    event_set(&listen_evq, listen_socket, EV_READ | EV_PERSIST,
              accept_handler, &listen_evq);

    set_main_timeout(main_deadline);

    r = listen(listen_socket, 1024);
    if (r == -1) twarn("listen()");
}

void
set_main_timeout(time_t deadline)
{
    int r;
    struct timeval tv = {deadline - time(NULL), 0};

    main_deadline = deadline;
    r = event_add(&listen_evq, deadline ? &tv : NULL);
    if (r == -1) twarn("event_add()");
}
Something went wrong with that request. Please try again.