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/*
* uhttpd - Tiny single-threaded httpd
*
* Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
* Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include "uhttpd.h"
struct listener {
struct list_head list;
struct uloop_fd fd;
int socket;
int n_clients;
struct sockaddr_in6 addr;
bool tls;
bool blocked;
};
static LIST_HEAD(listeners);
static int n_blocked;
void uh_close_listen_fds(void)
{
struct listener *l;
list_for_each_entry(l, &listeners, list)
close(l->fd.fd);
}
static void uh_block_listener(struct listener *l)
{
uloop_fd_delete(&l->fd);
n_blocked++;
l->blocked = true;
}
static void uh_poll_listeners(struct uloop_timeout *timeout)
{
struct listener *l;
if ((!n_blocked && conf.max_connections) ||
n_clients >= conf.max_connections)
return;
list_for_each_entry(l, &listeners, list) {
if (!l->blocked)
continue;
l->fd.cb(&l->fd, ULOOP_READ);
if (n_clients >= conf.max_connections)
break;
n_blocked--;
l->blocked = false;
uloop_fd_add(&l->fd, ULOOP_READ);
}
}
void uh_unblock_listeners(void)
{
static struct uloop_timeout poll_timer = {
.cb = uh_poll_listeners
};
uloop_timeout_set(&poll_timer, 1);
}
static void listener_cb(struct uloop_fd *fd, unsigned int events)
{
struct listener *l = container_of(fd, struct listener, fd);
while (1) {
if (!uh_accept_client(fd->fd, l->tls))
break;
}
if (conf.max_connections && n_clients >= conf.max_connections)
uh_block_listener(l);
}
void uh_setup_listeners(void)
{
struct listener *l;
int yes = 1;
list_for_each_entry(l, &listeners, list) {
int sock = l->fd.fd;
/* TCP keep-alive */
if (conf.tcp_keepalive > 0) {
#ifdef linux
int tcp_ka_idl, tcp_ka_int, tcp_ka_cnt, tcp_fstopn;
tcp_ka_idl = 1;
tcp_ka_cnt = 3;
tcp_ka_int = conf.tcp_keepalive;
tcp_fstopn = 5;
setsockopt(sock, SOL_TCP, TCP_KEEPIDLE, &tcp_ka_idl, sizeof(tcp_ka_idl));
setsockopt(sock, SOL_TCP, TCP_KEEPINTVL, &tcp_ka_int, sizeof(tcp_ka_int));
setsockopt(sock, SOL_TCP, TCP_KEEPCNT, &tcp_ka_cnt, sizeof(tcp_ka_cnt));
setsockopt(sock, SOL_TCP, TCP_FASTOPEN, &tcp_fstopn, sizeof(tcp_fstopn));
#endif
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &yes, sizeof(yes));
}
l->fd.cb = listener_cb;
uloop_fd_add(&l->fd, ULOOP_READ);
}
}
int uh_socket_bind(const char *host, const char *port, bool tls)
{
int sock = -1;
int yes = 1;
int status;
int bound = 0;
struct listener *l = NULL;
struct addrinfo *addrs = NULL, *p = NULL;
static struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_PASSIVE,
};
if ((status = getaddrinfo(host, port, &hints, &addrs)) != 0) {
fprintf(stderr, "getaddrinfo(): %s\n", gai_strerror(status));
return 0;
}
/* try to bind a new socket to each found address */
for (p = addrs; p; p = p->ai_next) {
/* get the socket */
sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
if (sock < 0) {
perror("socket()");
goto error;
}
/* "address already in use" */
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes))) {
perror("setsockopt()");
goto error;
}
/* required to get parallel v4 + v6 working */
if (p->ai_family == AF_INET6 &&
setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &yes, sizeof(yes)) < 0) {
perror("setsockopt()");
goto error;
}
/* bind */
if (bind(sock, p->ai_addr, p->ai_addrlen) < 0) {
perror("bind()");
goto error;
}
/* listen */
if (listen(sock, UH_LIMIT_CLIENTS) < 0) {
perror("listen()");
goto error;
}
fd_cloexec(sock);
l = calloc(1, sizeof(*l));
if (!l)
goto error;
l->fd.fd = sock;
l->tls = tls;
memcpy(&l->addr, p->ai_addr, p->ai_addrlen);
list_add_tail(&l->list, &listeners);
bound++;
continue;
error:
if (sock > -1)
close(sock);
}
freeaddrinfo(addrs);
return bound;
}
int uh_first_tls_port(int family)
{
struct listener *l;
int tls_port = -1;
list_for_each_entry(l, &listeners, list) {
if (!l->tls || l->addr.sin6_family != family)
continue;
if (tls_port != -1 && ntohs(l->addr.sin6_port) != 443)
continue;
tls_port = ntohs(l->addr.sin6_port);
}
return tls_port;
}
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