/* 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()");
}
