src/sock.c

/*
 * Generic code for native (BSD-compatible) sockets
 *
 * Copyright 2000-2020 Willy Tarreau <w@1wt.eu>
 *
 * 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
 * 2 of the License, or (at your option) any later version.
 *
 */

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>

#include <haproxy/api.h>
#include <haproxy/connection.h>
#include <haproxy/listener-t.h>
#include <haproxy/namespace.h>
#include <haproxy/sock.h>
#include <haproxy/tools.h>

/* the list of remaining sockets transferred from an older process */
struct xfer_sock_list *xfer_sock_list = NULL;

/* Create a socket to connect to the server in conn->dst (which MUST be valid),
 * using the configured namespace if needed, or the one passed by the proxy
 * protocol if required to do so. It ultimately calls socket() or socketat()
 * and returns the FD or error code.
 */
int sock_create_server_socket(struct connection *conn)
{
	const struct netns_entry *ns = NULL;

#ifdef USE_NS
	if (objt_server(conn->target)) {
		if (__objt_server(conn->target)->flags & SRV_F_USE_NS_FROM_PP)
			ns = conn->proxy_netns;
		else
			ns = __objt_server(conn->target)->netns;
	}
#endif
	return my_socketat(ns, conn->dst->ss_family, SOCK_STREAM, 0);
}

/*
 * Retrieves the source address for the socket <fd>, with <dir> indicating
 * if we're a listener (=0) or an initiator (!=0). It returns 0 in case of
 * success, -1 in case of error. The socket's source address is stored in
 * <sa> for <salen> bytes.
 */
int sock_get_src(int fd, struct sockaddr *sa, socklen_t salen, int dir)
{
	if (dir)
		return getsockname(fd, sa, &salen);
	else
		return getpeername(fd, sa, &salen);
}

/*
 * Retrieves the original destination address for the socket <fd>, with <dir>
 * indicating if we're a listener (=0) or an initiator (!=0). It returns 0 in
 * case of success, -1 in case of error. The socket's source address is stored
 * in <sa> for <salen> bytes.
 */
int sock_get_dst(int fd, struct sockaddr *sa, socklen_t salen, int dir)
{
	if (dir)
		return getpeername(fd, sa, &salen);
	else
		return getsockname(fd, sa, &salen);
}

/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */