121 lines
4.0 KiB
C
121 lines
4.0 KiB
C
/* Copyright (c) 2008 The Board of Trustees of The Leland Stanford
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* Junior University
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*
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* We are making the OpenFlow specification and associated documentation
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* (Software) available for public use and benefit with the expectation
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* that others will use, modify and enhance the Software and contribute
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* those enhancements back to the community. However, since we would
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* like to make the Software available for broadest use, with as few
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* restrictions as possible permission is hereby granted, free of
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* charge, to any person obtaining a copy of this Software to deal in
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* the Software under the copyrights without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* The name and trademarks of copyright holder(s) may NOT be used in
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* advertising or publicity pertaining to the Software or any
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* derivatives without specific, written prior permission.
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*/
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#include "socket-util.h"
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#include <arpa/inet.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <poll.h>
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#include <stdio.h>
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#include <string.h>
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#include "vlog.h"
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#define THIS_MODULE VLM_socket_util
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/* Sets 'fd' to non-blocking mode. Returns 0 if successful, otherwise a
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* positive errno value. */
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int
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set_nonblocking(int fd)
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{
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int flags = fcntl(fd, F_GETFL, 0);
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if (flags != -1) {
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if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) != -1) {
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return 0;
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} else {
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VLOG_ERR("fcntl(F_SETFL) failed: %s", strerror(errno));
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return errno;
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}
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} else {
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VLOG_ERR("fcntl(F_GETFL) failed: %s", strerror(errno));
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return errno;
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}
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}
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/* Translates 'host_name', which may be a DNS name or an IP address, into a
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* numeric IP address in '*addr'. Returns 0 if successful, otherwise a
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* positive errno value. */
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int
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lookup_ip(const char *host_name, struct in_addr *addr)
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{
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if (!inet_aton(host_name, addr)) {
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struct hostent *he = gethostbyname(host_name);
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if (he == NULL) {
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VLOG_ERR("gethostbyname(%s): %s", host_name,
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(h_errno == HOST_NOT_FOUND ? "host not found"
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: h_errno == TRY_AGAIN ? "try again"
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: h_errno == NO_RECOVERY ? "non-recoverable error"
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: h_errno == NO_ADDRESS ? "no address"
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: "unknown error"));
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return ENOENT;
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}
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addr->s_addr = *(uint32_t *) he->h_addr;
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}
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return 0;
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}
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/* Returns the error condition associated with socket 'fd' and resets the
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* socket's error status. */
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int
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get_socket_error(int fd)
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{
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int error;
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socklen_t len = sizeof(error);
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if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
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error = errno;
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VLOG_ERR("getsockopt(SO_ERROR): %s", strerror(error));
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}
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return error;
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}
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int
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check_connection_completion(int fd)
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{
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struct pollfd pfd;
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int retval;
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pfd.fd = fd;
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pfd.events = POLLOUT;
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do {
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retval = poll(&pfd, 1, 0);
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} while (retval < 0 && errno == EINTR);
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if (retval == 1) {
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return get_socket_error(fd);
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} else if (retval < 0) {
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VLOG_ERR("poll: %s", strerror(errno));
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return errno;
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} else {
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return EAGAIN;
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}
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}
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