libwebsockets/lib/plat/unix/unix-sockets.c

/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010-2018 Andy Green <andy@warmcat.com>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation:
 *  version 2.1 of the License.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA  02110-1301  USA
 */

#define _GNU_SOURCE
#include "core/private.h"

#include <pwd.h>
#include <grp.h>



int
lws_send_pipe_choked(struct lws *wsi)
{
	struct lws_pollfd fds;
	struct lws *wsi_eff;

#if defined(LWS_WITH_HTTP2)
	wsi_eff = lws_get_network_wsi(wsi);
#else
	wsi_eff = wsi;
#endif

	/* the fact we checked implies we avoided back-to-back writes */
	wsi_eff->could_have_pending = 0;

	/* treat the fact we got a truncated send pending as if we're choked */
	if (lws_has_buffered_out(wsi_eff)
#if defined(LWS_WITH_HTTP_STREAM_COMPRESSION)
	    ||wsi->http.comp_ctx.buflist_comp ||
	    wsi->http.comp_ctx.may_have_more
#endif
	    )
		return 1;

	fds.fd = wsi_eff->desc.sockfd;
	fds.events = POLLOUT;
	fds.revents = 0;

	if (poll(&fds, 1, 0) != 1)
		return 1;

	if ((fds.revents & POLLOUT) == 0)
		return 1;

	/* okay to send another packet without blocking */

	return 0;
}

int
lws_plat_set_nonblocking(int fd)
{
	return fcntl(fd, F_SETFL, O_NONBLOCK) < 0;
}

int
lws_plat_set_socket_options(struct lws_vhost *vhost, int fd, int unix_skt)
{
	int optval = 1;
	socklen_t optlen = sizeof(optval);

#if defined(__APPLE__) || \
    defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
    defined(__NetBSD__) || \
    defined(__OpenBSD__) || \
    defined(__HAIKU__)
	struct protoent *tcp_proto;
#endif

	(void)fcntl(fd, F_SETFD, FD_CLOEXEC);

	if (!unix_skt && vhost->ka_time) {
		/* enable keepalive on this socket */
		optval = 1;
		if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE,
			       (const void *)&optval, optlen) < 0)
			return 1;

#if defined(__APPLE__) || \
    defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
    defined(__NetBSD__) || \
    defined(__CYGWIN__) || defined(__OpenBSD__) || defined (__sun) || \
    defined(__HAIKU__)

		/*
		 * didn't find a way to set these per-socket, need to
		 * tune kernel systemwide values
		 */
#else
		/* set the keepalive conditions we want on it too */

#if defined(LWS_HAVE_TCP_USER_TIMEOUT)
		optval = 1000 * (vhost->ka_time +
				 (vhost->ka_interval * vhost->ka_probes));
		if (setsockopt(fd, IPPROTO_TCP, TCP_USER_TIMEOUT,
			       (const void *)&optval, optlen) < 0)
			return 1;
#endif
		optval = vhost->ka_time;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE,
			       (const void *)&optval, optlen) < 0)
			return 1;

		optval = vhost->ka_interval;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL,
			       (const void *)&optval, optlen) < 0)
			return 1;

		optval = vhost->ka_probes;
		if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT,
			       (const void *)&optval, optlen) < 0)
			return 1;
#endif
	}

#if defined(SO_BINDTODEVICE)
	if (!unix_skt && vhost->bind_iface && vhost->iface) {
		lwsl_info("binding listen skt to %s using SO_BINDTODEVICE\n", vhost->iface);
		if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, vhost->iface,
				strlen(vhost->iface)) < 0) {
			lwsl_warn("Failed to bind to device %s\n", vhost->iface);
			return 1;
		}
	}
#endif

	/* Disable Nagle */
	optval = 1;
#if defined (__sun) || defined(__QNX__)
	if (!unix_skt && setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
		return 1;
#elif !defined(__APPLE__) && \
      !defined(__FreeBSD__) && !defined(__FreeBSD_kernel__) &&        \
      !defined(__NetBSD__) && \
      !defined(__OpenBSD__) && \
      !defined(__HAIKU__)
	if (!unix_skt && setsockopt(fd, SOL_TCP, TCP_NODELAY, (const void *)&optval, optlen) < 0)
		return 1;
#else
	tcp_proto = getprotobyname("TCP");
	if (!unix_skt && setsockopt(fd, tcp_proto->p_proto, TCP_NODELAY, &optval, optlen) < 0)
		return 1;
#endif

	return lws_plat_set_nonblocking(fd);
}


/* cast a struct sockaddr_in6 * into addr for ipv6 */

int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
		    size_t addrlen)
{
	int rc = LWS_ITOSA_NOT_EXIST;

	struct ifaddrs *ifr;
	struct ifaddrs *ifc;
#ifdef LWS_WITH_IPV6
	struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
#endif

	getifaddrs(&ifr);
	for (ifc = ifr; ifc != NULL && rc; ifc = ifc->ifa_next) {
		if (!ifc->ifa_addr)
			continue;

		lwsl_debug(" interface %s vs %s (fam %d) ipv6 %d\n",
			   ifc->ifa_name, ifname,
			   ifc->ifa_addr->sa_family, ipv6);

		if (strcmp(ifc->ifa_name, ifname))
			continue;

		switch (ifc->ifa_addr->sa_family) {
#if defined(AF_PACKET)
		case AF_PACKET:
			/* interface exists but is not usable */
			rc = LWS_ITOSA_NOT_USABLE;
			continue;
#endif

		case AF_INET:
#ifdef LWS_WITH_IPV6
			if (ipv6) {
				/* map IPv4 to IPv6 */
				memset((char *)&addr6->sin6_addr, 0,
						sizeof(struct in6_addr));
				addr6->sin6_addr.s6_addr[10] = 0xff;
				addr6->sin6_addr.s6_addr[11] = 0xff;
				memcpy(&addr6->sin6_addr.s6_addr[12],
				       &((struct sockaddr_in *)ifc->ifa_addr)->sin_addr,
							sizeof(struct in_addr));
				lwsl_debug("%s: uplevelling ipv4 bind to ipv6\n", __func__);
			} else
#endif
				memcpy(addr,
					(struct sockaddr_in *)ifc->ifa_addr,
						    sizeof(struct sockaddr_in));
			break;
#ifdef LWS_WITH_IPV6
		case AF_INET6:
			memcpy(&addr6->sin6_addr,
			  &((struct sockaddr_in6 *)ifc->ifa_addr)->sin6_addr,
						       sizeof(struct in6_addr));
			break;
#endif
		default:
			continue;
		}
		rc = LWS_ITOSA_USABLE;
	}

	freeifaddrs(ifr);

	if (rc) {
		/* check if bind to IP address */
#ifdef LWS_WITH_IPV6
		if (inet_pton(AF_INET6, ifname, &addr6->sin6_addr) == 1)
			rc = LWS_ITOSA_USABLE;
		else
#endif
		if (inet_pton(AF_INET, ifname, &addr->sin_addr) == 1)
			rc = LWS_ITOSA_USABLE;
	}

	return rc;
}


const char *
lws_plat_inet_ntop(int af, const void *src, char *dst, int cnt)
{
	return inet_ntop(af, src, dst, cnt);
}

int
lws_plat_inet_pton(int af, const char *src, void *dst)
{
	return inet_pton(af, src, dst);
}