mirror of
https://github.com/openvswitch/ovs
synced 2025-08-22 18:07:40 +00:00
ff792c6ac7
Unfortunately, WSAPoll misbehaves on Windows please view detailed behavior on: https://github.com/openvswitch/ovs-issues/issues/117 We replace the WSAPoll with select looking only for errors and write events. Reported-at: https://github.com/openvswitch/ovs-issues/issues/117 Reported-by: Yin Lin <linyi@vmware.com> Signed-off-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com> Acked-by: Sairam Venugopal <vsairam@vmware.com> Signed-off-by: Gurucharan Shetty <guru@ovn.org>
1023 lines
28 KiB
C
1023 lines
28 KiB
C
/*
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* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <config.h>
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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 <net/if.h>
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#include <netdb.h>
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#include <netinet/tcp.h>
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#include <poll.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include "openvswitch/dynamic-string.h"
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#include "ovs-thread.h"
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#include "packets.h"
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#include "poll-loop.h"
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#include "util.h"
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#include "openvswitch/vlog.h"
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#ifdef __linux__
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#include <linux/if_packet.h>
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#endif
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#ifdef HAVE_NETLINK
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#include "netlink-protocol.h"
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#include "netlink-socket.h"
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#endif
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VLOG_DEFINE_THIS_MODULE(socket_util);
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static int getsockopt_int(int fd, int level, int option, const char *optname,
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int *valuep);
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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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#ifndef _WIN32
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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", ovs_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", ovs_strerror(errno));
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return errno;
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}
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#else
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unsigned long arg = 1;
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if (ioctlsocket(fd, FIONBIO, &arg)) {
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int error = sock_errno();
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VLOG_ERR("set_nonblocking failed: %s", sock_strerror(error));
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return error;
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}
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return 0;
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#endif
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}
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void
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xset_nonblocking(int fd)
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{
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if (set_nonblocking(fd)) {
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exit(EXIT_FAILURE);
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}
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}
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void
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setsockopt_tcp_nodelay(int fd)
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{
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int on = 1;
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int retval;
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retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
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if (retval) {
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retval = sock_errno();
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VLOG_ERR("setsockopt(TCP_NODELAY): %s", sock_strerror(retval));
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}
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}
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/* Sets the DSCP value of socket 'fd' to 'dscp', which must be 63 or less.
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* 'family' must indicate the socket's address family (AF_INET or AF_INET6, to
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* do anything useful). */
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int
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set_dscp(int fd, int family, uint8_t dscp)
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{
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int retval;
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int val;
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#ifdef _WIN32
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/* XXX: Consider using QoS2 APIs for Windows to set dscp. */
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return 0;
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#endif
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if (dscp > 63) {
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return EINVAL;
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}
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val = dscp << 2;
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switch (family) {
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case AF_INET:
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retval = setsockopt(fd, IPPROTO_IP, IP_TOS, &val, sizeof val);
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break;
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case AF_INET6:
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retval = setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &val, sizeof val);
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break;
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default:
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return ENOPROTOOPT;
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}
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return retval ? sock_errno() : 0;
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}
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/* Checks whether 'host_name' is an IPv4 or IPv6 address. It is assumed
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* that 'host_name' is valid. Returns false if it is IPv4 address, true if
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* it is IPv6 address. */
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bool
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addr_is_ipv6(const char *host_name)
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{
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return strchr(host_name, ':') != NULL;
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}
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/* Translates 'host_name', which must be a string representation of an IP
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* address, into a numeric IP address in '*addr'. Returns 0 if successful,
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* otherwise a 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 (!ip_parse(host_name, &addr->s_addr)) {
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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VLOG_ERR_RL(&rl, "\"%s\" is not a valid IP address", host_name);
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return ENOENT;
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}
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return 0;
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}
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/* Translates 'host_name', which must be a string representation of an IPv6
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* address, into a numeric IPv6 address in '*addr'. Returns 0 if successful,
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* otherwise a positive errno value. */
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int
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lookup_ipv6(const char *host_name, struct in6_addr *addr)
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{
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if (!ipv6_parse(host_name, addr)) {
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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(1, 5);
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VLOG_ERR_RL(&rl, "\"%s\" is not a valid IPv6 address", host_name);
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return ENOENT;
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}
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return 0;
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}
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/* Translates 'host_name', which must be a host name or a string representation
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* of an IP address, into a numeric IP address in '*addr'. Returns 0 if
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* successful, otherwise a positive errno value.
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*
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* Most Open vSwitch code should not use this because it causes deadlocks:
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* getaddrinfo() sends out a DNS request but that starts a new flow for which
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* OVS must set up a flow, but it can't because it's waiting for a DNS reply.
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* The synchronous lookup also delays other activity. (Of course we can solve
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* this but it doesn't seem worthwhile quite yet.) */
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int
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lookup_hostname(const char *host_name, struct in_addr *addr)
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{
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struct addrinfo *result;
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struct addrinfo hints;
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if (ip_parse(host_name, &addr->s_addr)) {
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return 0;
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}
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memset(&hints, 0, sizeof hints);
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hints.ai_family = AF_INET;
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switch (getaddrinfo(host_name, NULL, &hints, &result)) {
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case 0:
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*addr = ALIGNED_CAST(struct sockaddr_in *,
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result->ai_addr)->sin_addr;
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freeaddrinfo(result);
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return 0;
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#ifdef EAI_ADDRFAMILY
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case EAI_ADDRFAMILY:
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#endif
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case EAI_NONAME:
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case EAI_SERVICE:
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return ENOENT;
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case EAI_AGAIN:
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return EAGAIN;
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case EAI_BADFLAGS:
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case EAI_FAMILY:
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case EAI_SOCKTYPE:
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return EINVAL;
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case EAI_FAIL:
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return EIO;
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case EAI_MEMORY:
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return ENOMEM;
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#if defined (EAI_NODATA) && EAI_NODATA != EAI_NONAME
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case EAI_NODATA:
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return ENXIO;
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#endif
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#ifdef EAI_SYSTEM
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case EAI_SYSTEM:
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return sock_errno();
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#endif
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default:
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return EPROTO;
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}
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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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static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
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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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#ifndef _WIN32
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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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#else
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fd_set wrset, exset;
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FD_ZERO(&wrset);
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FD_ZERO(&exset);
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FD_SET(fd, &exset);
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FD_SET(fd, &wrset);
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pfd.revents = 0;
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struct timeval tv = { 0, 0 };
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/* WSAPoll is broken on Windows, instead do a select */
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retval = select(0, NULL, &wrset, &exset, &tv);
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if (retval == 1) {
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if (FD_ISSET(fd, &wrset)) {
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pfd.revents |= pfd.events;
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}
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if (FD_ISSET(fd, &exset)) {
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pfd.revents |= POLLERR;
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}
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}
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#endif
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if (retval == 1) {
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if (pfd.revents & POLLERR) {
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ssize_t n = send(fd, "", 1, 0);
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if (n < 0) {
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return sock_errno();
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} else {
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VLOG_ERR_RL(&rl, "poll return POLLERR but send succeeded");
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return EPROTO;
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}
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}
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return 0;
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} else if (retval < 0) {
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VLOG_ERR_RL(&rl, "poll: %s", sock_strerror(sock_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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/* Returns the size of socket 'sock''s receive buffer (SO_RCVBUF), or a
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* negative errno value if an error occurs. */
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int
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get_socket_rcvbuf(int sock)
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{
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int rcvbuf;
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int error;
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error = getsockopt_int(sock, SOL_SOCKET, SO_RCVBUF, "SO_RCVBUF", &rcvbuf);
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return error ? -error : rcvbuf;
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}
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/* Reads and discards up to 'n' datagrams from 'fd', stopping as soon as no
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* more data can be immediately read. ('fd' should therefore be in
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* non-blocking mode.)*/
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void
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drain_fd(int fd, size_t n_packets)
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{
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for (; n_packets > 0; n_packets--) {
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/* 'buffer' only needs to be 1 byte long in most circumstances. This
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* size is defensive against the possibility that we someday want to
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* use a Linux tap device without TUN_NO_PI, in which case a buffer
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* smaller than sizeof(struct tun_pi) will give EINVAL on read. */
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char buffer[128];
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if (read(fd, buffer, sizeof buffer) <= 0) {
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break;
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}
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}
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}
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ovs_be32
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guess_netmask(ovs_be32 ip_)
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{
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uint32_t ip = ntohl(ip_);
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return ((ip >> 31) == 0 ? htonl(0xff000000) /* Class A */
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: (ip >> 30) == 2 ? htonl(0xffff0000) /* Class B */
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: (ip >> 29) == 6 ? htonl(0xffffff00) /* Class C */
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: htonl(0)); /* ??? */
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}
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|
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/* This is like strsep() except:
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*
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* - The separator string is ":".
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*
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* - Square brackets [] quote ":" separators and are removed from the
|
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* tokens. */
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static char *
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parse_bracketed_token(char **pp)
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{
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char *p = *pp;
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|
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if (p == NULL) {
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return NULL;
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} else if (*p == '\0') {
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*pp = NULL;
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return p;
|
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} else if (*p == '[') {
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char *start = p + 1;
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char *end = start + strcspn(start, "]");
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*pp = (*end == '\0' ? NULL
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: end[1] == ':' ? end + 2
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: end + 1);
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*end = '\0';
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return start;
|
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} else {
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char *start = p;
|
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char *end = start + strcspn(start, ":");
|
||
*pp = *end == '\0' ? NULL : end + 1;
|
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*end = '\0';
|
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return start;
|
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}
|
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}
|
||
|
||
static bool
|
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parse_sockaddr_components(struct sockaddr_storage *ss,
|
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const char *host_s,
|
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const char *port_s, uint16_t default_port,
|
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const char *s)
|
||
{
|
||
struct sockaddr_in *sin = ALIGNED_CAST(struct sockaddr_in *, ss);
|
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int port;
|
||
|
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if (port_s && port_s[0]) {
|
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if (!str_to_int(port_s, 10, &port) || port < 0 || port > 65535) {
|
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VLOG_ERR("%s: bad port number \"%s\"", s, port_s);
|
||
goto exit;
|
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}
|
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} else {
|
||
port = default_port;
|
||
}
|
||
|
||
memset(ss, 0, sizeof *ss);
|
||
if (strchr(host_s, ':')) {
|
||
struct sockaddr_in6 *sin6
|
||
= ALIGNED_CAST(struct sockaddr_in6 *, ss);
|
||
|
||
sin6->sin6_family = AF_INET6;
|
||
sin6->sin6_port = htons(port);
|
||
if (!ipv6_parse(host_s, &sin6->sin6_addr)) {
|
||
VLOG_ERR("%s: bad IPv6 address \"%s\"", s, host_s);
|
||
goto exit;
|
||
}
|
||
} else {
|
||
sin->sin_family = AF_INET;
|
||
sin->sin_port = htons(port);
|
||
if (!ip_parse(host_s, &sin->sin_addr.s_addr)) {
|
||
VLOG_ERR("%s: bad IPv4 address \"%s\"", s, host_s);
|
||
goto exit;
|
||
}
|
||
}
|
||
|
||
return true;
|
||
|
||
exit:
|
||
memset(ss, 0, sizeof *ss);
|
||
return false;
|
||
}
|
||
|
||
/* Parses 'target', which should be a string in the format "<host>[:<port>]".
|
||
* <host>, which is required, may be an IPv4 address or an IPv6 address
|
||
* enclosed in square brackets. If 'default_port' is nonzero then <port> is
|
||
* optional and defaults to 'default_port'.
|
||
*
|
||
* On success, returns true and stores the parsed remote address into '*ss'.
|
||
* On failure, logs an error, stores zeros into '*ss', and returns false. */
|
||
bool
|
||
inet_parse_active(const char *target_, uint16_t default_port,
|
||
struct sockaddr_storage *ss)
|
||
{
|
||
char *target = xstrdup(target_);
|
||
const char *port;
|
||
const char *host;
|
||
char *p;
|
||
bool ok;
|
||
|
||
p = target;
|
||
host = parse_bracketed_token(&p);
|
||
port = parse_bracketed_token(&p);
|
||
if (!host) {
|
||
VLOG_ERR("%s: host must be specified", target_);
|
||
ok = false;
|
||
} else if (!port && !default_port) {
|
||
VLOG_ERR("%s: port must be specified", target_);
|
||
ok = false;
|
||
} else {
|
||
ok = parse_sockaddr_components(ss, host, port, default_port, target_);
|
||
}
|
||
if (!ok) {
|
||
memset(ss, 0, sizeof *ss);
|
||
}
|
||
free(target);
|
||
return ok;
|
||
}
|
||
|
||
|
||
/* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style' and
|
||
* connects to 'target', which should be a string in the format
|
||
* "<host>[:<port>]". <host>, which is required, may be an IPv4 address or an
|
||
* IPv6 address enclosed in square brackets. If 'default_port' is nonzero then
|
||
* <port> is optional and defaults to 'default_port'.
|
||
*
|
||
* 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
|
||
*
|
||
* On success, returns 0 (indicating connection complete) or EAGAIN (indicating
|
||
* connection in progress), in which case the new file descriptor is stored
|
||
* into '*fdp'. On failure, returns a positive errno value other than EAGAIN
|
||
* and stores -1 into '*fdp'.
|
||
*
|
||
* If 'ss' is non-null, then on success stores the target address into '*ss'.
|
||
*
|
||
* 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
|
||
* should be in the range [0, 63] and will automatically be shifted to the
|
||
* appropriately place in the IP tos field. */
|
||
int
|
||
inet_open_active(int style, const char *target, uint16_t default_port,
|
||
struct sockaddr_storage *ssp, int *fdp, uint8_t dscp)
|
||
{
|
||
struct sockaddr_storage ss;
|
||
int fd = -1;
|
||
int error;
|
||
|
||
/* Parse. */
|
||
if (!inet_parse_active(target, default_port, &ss)) {
|
||
error = EAFNOSUPPORT;
|
||
goto exit;
|
||
}
|
||
|
||
/* Create non-blocking socket. */
|
||
fd = socket(ss.ss_family, style, 0);
|
||
if (fd < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: socket: %s", target, sock_strerror(error));
|
||
goto exit;
|
||
}
|
||
error = set_nonblocking(fd);
|
||
if (error) {
|
||
goto exit;
|
||
}
|
||
|
||
/* The dscp bits must be configured before connect() to ensure that the
|
||
* TOS field is set during the connection establishment. If set after
|
||
* connect(), the handshake SYN frames will be sent with a TOS of 0. */
|
||
error = set_dscp(fd, ss.ss_family, dscp);
|
||
if (error) {
|
||
VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error));
|
||
goto exit;
|
||
}
|
||
|
||
/* Connect. */
|
||
error = connect(fd, (struct sockaddr *) &ss, ss_length(&ss)) == 0
|
||
? 0
|
||
: sock_errno();
|
||
if (error == EINPROGRESS
|
||
#ifdef _WIN32
|
||
|| error == WSAEALREADY || error == WSAEWOULDBLOCK
|
||
#endif
|
||
) {
|
||
error = EAGAIN;
|
||
}
|
||
|
||
exit:
|
||
if (error && error != EAGAIN) {
|
||
if (ssp) {
|
||
memset(ssp, 0, sizeof *ssp);
|
||
}
|
||
if (fd >= 0) {
|
||
closesocket(fd);
|
||
fd = -1;
|
||
}
|
||
} else {
|
||
if (ssp) {
|
||
*ssp = ss;
|
||
}
|
||
}
|
||
*fdp = fd;
|
||
return error;
|
||
}
|
||
|
||
/* Parses 'target', which should be a string in the format "[<port>][:<host>]":
|
||
*
|
||
* - If 'default_port' is -1, then <port> is required. Otherwise, if
|
||
* <port> is omitted, then 'default_port' is used instead.
|
||
*
|
||
* - If <port> (or 'default_port', if used) is 0, then no port is bound
|
||
* and the TCP/IP stack will select a port.
|
||
*
|
||
* - <host> is optional. If supplied, it may be an IPv4 address or an
|
||
* IPv6 address enclosed in square brackets. If omitted, the IP address
|
||
* is wildcarded.
|
||
*
|
||
* If successful, stores the address into '*ss' and returns true; otherwise
|
||
* zeros '*ss' and returns false. */
|
||
bool
|
||
inet_parse_passive(const char *target_, int default_port,
|
||
struct sockaddr_storage *ss)
|
||
{
|
||
char *target = xstrdup(target_);
|
||
const char *port;
|
||
const char *host;
|
||
char *p;
|
||
bool ok;
|
||
|
||
p = target;
|
||
port = parse_bracketed_token(&p);
|
||
host = parse_bracketed_token(&p);
|
||
if (!port && default_port < 0) {
|
||
VLOG_ERR("%s: port must be specified", target_);
|
||
ok = false;
|
||
} else {
|
||
ok = parse_sockaddr_components(ss, host ? host : "0.0.0.0",
|
||
port, default_port, target_);
|
||
}
|
||
if (!ok) {
|
||
memset(ss, 0, sizeof *ss);
|
||
}
|
||
free(target);
|
||
return ok;
|
||
}
|
||
|
||
|
||
/* Opens a non-blocking IPv4 or IPv6 socket of the specified 'style', binds to
|
||
* 'target', and listens for incoming connections. Parses 'target' in the same
|
||
* way was inet_parse_passive().
|
||
*
|
||
* 'style' should be SOCK_STREAM (for TCP) or SOCK_DGRAM (for UDP).
|
||
*
|
||
* For TCP, the socket will have SO_REUSEADDR turned on.
|
||
*
|
||
* On success, returns a non-negative file descriptor. On failure, returns a
|
||
* negative errno value.
|
||
*
|
||
* If 'ss' is non-null, then on success stores the bound address into '*ss'.
|
||
*
|
||
* 'dscp' becomes the DSCP bits in the IP headers for the new connection. It
|
||
* should be in the range [0, 63] and will automatically be shifted to the
|
||
* appropriately place in the IP tos field.
|
||
*
|
||
* If 'kernel_print_port' is true and the port is dynamically assigned by
|
||
* the kernel, print the chosen port. */
|
||
int
|
||
inet_open_passive(int style, const char *target, int default_port,
|
||
struct sockaddr_storage *ssp, uint8_t dscp,
|
||
bool kernel_print_port)
|
||
{
|
||
bool kernel_chooses_port;
|
||
struct sockaddr_storage ss;
|
||
int fd = 0, error;
|
||
unsigned int yes = 1;
|
||
|
||
if (!inet_parse_passive(target, default_port, &ss)) {
|
||
return -EAFNOSUPPORT;
|
||
}
|
||
kernel_chooses_port = ss_get_port(&ss) == 0;
|
||
|
||
/* Create non-blocking socket, set SO_REUSEADDR. */
|
||
fd = socket(ss.ss_family, style, 0);
|
||
if (fd < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: socket: %s", target, sock_strerror(error));
|
||
return -error;
|
||
}
|
||
error = set_nonblocking(fd);
|
||
if (error) {
|
||
goto error;
|
||
}
|
||
if (style == SOCK_STREAM
|
||
&& setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s",
|
||
target, sock_strerror(error));
|
||
goto error;
|
||
}
|
||
|
||
/* Bind. */
|
||
if (bind(fd, (struct sockaddr *) &ss, ss_length(&ss)) < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: bind: %s", target, sock_strerror(error));
|
||
goto error;
|
||
}
|
||
|
||
/* The dscp bits must be configured before connect() to ensure that the TOS
|
||
* field is set during the connection establishment. If set after
|
||
* connect(), the handshake SYN frames will be sent with a TOS of 0. */
|
||
error = set_dscp(fd, ss.ss_family, dscp);
|
||
if (error) {
|
||
VLOG_ERR("%s: set_dscp: %s", target, sock_strerror(error));
|
||
goto error;
|
||
}
|
||
|
||
/* Listen. */
|
||
if (style == SOCK_STREAM && listen(fd, 10) < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: listen: %s", target, sock_strerror(error));
|
||
goto error;
|
||
}
|
||
|
||
if (ssp || kernel_chooses_port) {
|
||
socklen_t ss_len = sizeof ss;
|
||
if (getsockname(fd, (struct sockaddr *) &ss, &ss_len) < 0) {
|
||
error = sock_errno();
|
||
VLOG_ERR("%s: getsockname: %s", target, sock_strerror(error));
|
||
goto error;
|
||
}
|
||
if (kernel_chooses_port && kernel_print_port) {
|
||
VLOG_INFO("%s: listening on port %"PRIu16,
|
||
target, ss_get_port(&ss));
|
||
}
|
||
if (ssp) {
|
||
*ssp = ss;
|
||
}
|
||
}
|
||
|
||
return fd;
|
||
|
||
error:
|
||
if (ssp) {
|
||
memset(ssp, 0, sizeof *ssp);
|
||
}
|
||
closesocket(fd);
|
||
return -error;
|
||
}
|
||
|
||
int
|
||
read_fully(int fd, void *p_, size_t size, size_t *bytes_read)
|
||
{
|
||
uint8_t *p = p_;
|
||
|
||
*bytes_read = 0;
|
||
while (size > 0) {
|
||
ssize_t retval = read(fd, p, size);
|
||
if (retval > 0) {
|
||
*bytes_read += retval;
|
||
size -= retval;
|
||
p += retval;
|
||
} else if (retval == 0) {
|
||
return EOF;
|
||
} else if (errno != EINTR) {
|
||
return errno;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
write_fully(int fd, const void *p_, size_t size, size_t *bytes_written)
|
||
{
|
||
const uint8_t *p = p_;
|
||
|
||
*bytes_written = 0;
|
||
while (size > 0) {
|
||
ssize_t retval = write(fd, p, size);
|
||
if (retval > 0) {
|
||
*bytes_written += retval;
|
||
size -= retval;
|
||
p += retval;
|
||
} else if (retval == 0) {
|
||
VLOG_WARN("write returned 0");
|
||
return EPROTO;
|
||
} else if (errno != EINTR) {
|
||
return errno;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* Given file name 'file_name', fsyncs the directory in which it is contained.
|
||
* Returns 0 if successful, otherwise a positive errno value. */
|
||
int
|
||
fsync_parent_dir(const char *file_name)
|
||
{
|
||
int error = 0;
|
||
#ifndef _WIN32
|
||
char *dir;
|
||
int fd;
|
||
|
||
dir = dir_name(file_name);
|
||
fd = open(dir, O_RDONLY);
|
||
if (fd >= 0) {
|
||
if (fsync(fd)) {
|
||
if (errno == EINVAL || errno == EROFS) {
|
||
/* This directory does not support synchronization. Not
|
||
* really an error. */
|
||
} else {
|
||
error = errno;
|
||
VLOG_ERR("%s: fsync failed (%s)", dir, ovs_strerror(error));
|
||
}
|
||
}
|
||
close(fd);
|
||
} else {
|
||
error = errno;
|
||
VLOG_ERR("%s: open failed (%s)", dir, ovs_strerror(error));
|
||
}
|
||
free(dir);
|
||
#endif
|
||
|
||
return error;
|
||
}
|
||
|
||
/* Obtains the modification time of the file named 'file_name' to the greatest
|
||
* supported precision. If successful, stores the mtime in '*mtime' and
|
||
* returns 0. On error, returns a positive errno value and stores zeros in
|
||
* '*mtime'. */
|
||
int
|
||
get_mtime(const char *file_name, struct timespec *mtime)
|
||
{
|
||
struct stat s;
|
||
|
||
if (!stat(file_name, &s)) {
|
||
mtime->tv_sec = s.st_mtime;
|
||
|
||
#if HAVE_STRUCT_STAT_ST_MTIM_TV_NSEC
|
||
mtime->tv_nsec = s.st_mtim.tv_nsec;
|
||
#elif HAVE_STRUCT_STAT_ST_MTIMENSEC
|
||
mtime->tv_nsec = s.st_mtimensec;
|
||
#else
|
||
mtime->tv_nsec = 0;
|
||
#endif
|
||
|
||
return 0;
|
||
} else {
|
||
mtime->tv_sec = mtime->tv_nsec = 0;
|
||
return errno;
|
||
}
|
||
}
|
||
|
||
static int
|
||
getsockopt_int(int fd, int level, int option, const char *optname, int *valuep)
|
||
{
|
||
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 10);
|
||
socklen_t len;
|
||
int value;
|
||
int error;
|
||
|
||
len = sizeof value;
|
||
if (getsockopt(fd, level, option, &value, &len)) {
|
||
error = sock_errno();
|
||
VLOG_ERR_RL(&rl, "getsockopt(%s): %s", optname, sock_strerror(error));
|
||
} else if (len != sizeof value) {
|
||
error = EINVAL;
|
||
VLOG_ERR_RL(&rl, "getsockopt(%s): value is %u bytes (expected %"PRIuSIZE")",
|
||
optname, (unsigned int) len, sizeof value);
|
||
} else {
|
||
error = 0;
|
||
}
|
||
|
||
*valuep = error ? 0 : value;
|
||
return error;
|
||
}
|
||
|
||
static void
|
||
describe_sockaddr(struct ds *string, int fd,
|
||
int (*getaddr)(int, struct sockaddr *, socklen_t *))
|
||
{
|
||
struct sockaddr_storage ss;
|
||
socklen_t len = sizeof ss;
|
||
|
||
if (!getaddr(fd, (struct sockaddr *) &ss, &len)) {
|
||
if (ss.ss_family == AF_INET || ss.ss_family == AF_INET6) {
|
||
char addrbuf[SS_NTOP_BUFSIZE];
|
||
|
||
ds_put_format(string, "%s:%"PRIu16,
|
||
ss_format_address(&ss, addrbuf, sizeof addrbuf),
|
||
ss_get_port(&ss));
|
||
#ifndef _WIN32
|
||
} else if (ss.ss_family == AF_UNIX) {
|
||
struct sockaddr_un sun;
|
||
const char *null;
|
||
size_t maxlen;
|
||
|
||
memcpy(&sun, &ss, sizeof sun);
|
||
maxlen = len - offsetof(struct sockaddr_un, sun_path);
|
||
null = memchr(sun.sun_path, '\0', maxlen);
|
||
ds_put_buffer(string, sun.sun_path,
|
||
null ? null - sun.sun_path : maxlen);
|
||
#endif
|
||
}
|
||
#ifdef HAVE_NETLINK
|
||
else if (ss.ss_family == AF_NETLINK) {
|
||
int protocol;
|
||
|
||
/* SO_PROTOCOL was introduced in 2.6.32. Support it regardless of the version
|
||
* of the Linux kernel headers in use at build time. */
|
||
#ifndef SO_PROTOCOL
|
||
#define SO_PROTOCOL 38
|
||
#endif
|
||
|
||
if (!getsockopt_int(fd, SOL_SOCKET, SO_PROTOCOL, "SO_PROTOCOL",
|
||
&protocol)) {
|
||
switch (protocol) {
|
||
case NETLINK_ROUTE:
|
||
ds_put_cstr(string, "NETLINK_ROUTE");
|
||
break;
|
||
|
||
case NETLINK_GENERIC:
|
||
ds_put_cstr(string, "NETLINK_GENERIC");
|
||
break;
|
||
|
||
default:
|
||
ds_put_format(string, "AF_NETLINK family %d", protocol);
|
||
break;
|
||
}
|
||
} else {
|
||
ds_put_cstr(string, "AF_NETLINK");
|
||
}
|
||
}
|
||
#endif
|
||
#if __linux__
|
||
else if (ss.ss_family == AF_PACKET) {
|
||
struct sockaddr_ll sll;
|
||
|
||
memcpy(&sll, &ss, sizeof sll);
|
||
ds_put_cstr(string, "AF_PACKET");
|
||
if (sll.sll_ifindex) {
|
||
char name[IFNAMSIZ];
|
||
|
||
if (if_indextoname(sll.sll_ifindex, name)) {
|
||
ds_put_format(string, "(%s)", name);
|
||
} else {
|
||
ds_put_format(string, "(ifindex=%d)", sll.sll_ifindex);
|
||
}
|
||
}
|
||
if (sll.sll_protocol) {
|
||
ds_put_format(string, "(protocol=0x%"PRIu16")",
|
||
ntohs(sll.sll_protocol));
|
||
}
|
||
}
|
||
#endif
|
||
else if (ss.ss_family == AF_UNSPEC) {
|
||
ds_put_cstr(string, "AF_UNSPEC");
|
||
} else {
|
||
ds_put_format(string, "AF_%d", (int) ss.ss_family);
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
#ifdef __linux__
|
||
static void
|
||
put_fd_filename(struct ds *string, int fd)
|
||
{
|
||
char buf[1024];
|
||
char *linkname;
|
||
int n;
|
||
|
||
linkname = xasprintf("/proc/self/fd/%d", fd);
|
||
n = readlink(linkname, buf, sizeof buf);
|
||
if (n > 0) {
|
||
ds_put_char(string, ' ');
|
||
ds_put_buffer(string, buf, n);
|
||
if (n > sizeof buf) {
|
||
ds_put_cstr(string, "...");
|
||
}
|
||
}
|
||
free(linkname);
|
||
}
|
||
#endif
|
||
|
||
/* Returns a malloc()'d string describing 'fd', for use in logging. */
|
||
char *
|
||
describe_fd(int fd)
|
||
{
|
||
struct ds string;
|
||
struct stat s;
|
||
|
||
ds_init(&string);
|
||
#ifndef _WIN32
|
||
if (fstat(fd, &s)) {
|
||
ds_put_format(&string, "fstat failed (%s)", ovs_strerror(errno));
|
||
} else if (S_ISSOCK(s.st_mode)) {
|
||
describe_sockaddr(&string, fd, getsockname);
|
||
ds_put_cstr(&string, "<->");
|
||
describe_sockaddr(&string, fd, getpeername);
|
||
} else {
|
||
ds_put_cstr(&string, (isatty(fd) ? "tty"
|
||
: S_ISDIR(s.st_mode) ? "directory"
|
||
: S_ISCHR(s.st_mode) ? "character device"
|
||
: S_ISBLK(s.st_mode) ? "block device"
|
||
: S_ISREG(s.st_mode) ? "file"
|
||
: S_ISFIFO(s.st_mode) ? "FIFO"
|
||
: S_ISLNK(s.st_mode) ? "symbolic link"
|
||
: "unknown"));
|
||
#ifdef __linux__
|
||
put_fd_filename(&string, fd);
|
||
#endif
|
||
}
|
||
#else
|
||
ds_put_format(&string,"file descriptor");
|
||
#endif /* _WIN32 */
|
||
return ds_steal_cstr(&string);
|
||
}
|
||
|
||
|
||
/* sockaddr_storage helpers. */
|
||
|
||
/* Returns the IPv4 or IPv6 port in 'ss'. */
|
||
uint16_t
|
||
ss_get_port(const struct sockaddr_storage *ss)
|
||
{
|
||
if (ss->ss_family == AF_INET) {
|
||
const struct sockaddr_in *sin
|
||
= ALIGNED_CAST(const struct sockaddr_in *, ss);
|
||
return ntohs(sin->sin_port);
|
||
} else if (ss->ss_family == AF_INET6) {
|
||
const struct sockaddr_in6 *sin6
|
||
= ALIGNED_CAST(const struct sockaddr_in6 *, ss);
|
||
return ntohs(sin6->sin6_port);
|
||
} else {
|
||
OVS_NOT_REACHED();
|
||
}
|
||
}
|
||
|
||
/* Formats the IPv4 or IPv6 address in 'ss' into the 'bufsize' bytes in 'buf'.
|
||
* If 'ss' is an IPv6 address, puts square brackets around the address.
|
||
* 'bufsize' should be at least SS_NTOP_BUFSIZE.
|
||
*
|
||
* Returns 'buf'. */
|
||
char *
|
||
ss_format_address(const struct sockaddr_storage *ss,
|
||
char *buf, size_t bufsize)
|
||
{
|
||
ovs_assert(bufsize >= SS_NTOP_BUFSIZE);
|
||
if (ss->ss_family == AF_INET) {
|
||
const struct sockaddr_in *sin
|
||
= ALIGNED_CAST(const struct sockaddr_in *, ss);
|
||
|
||
snprintf(buf, bufsize, IP_FMT, IP_ARGS(sin->sin_addr.s_addr));
|
||
} else if (ss->ss_family == AF_INET6) {
|
||
const struct sockaddr_in6 *sin6
|
||
= ALIGNED_CAST(const struct sockaddr_in6 *, ss);
|
||
|
||
buf[0] = '[';
|
||
inet_ntop(AF_INET6, sin6->sin6_addr.s6_addr, buf + 1, bufsize - 1);
|
||
strcpy(strchr(buf, '\0'), "]");
|
||
} else {
|
||
OVS_NOT_REACHED();
|
||
}
|
||
|
||
return buf;
|
||
}
|
||
|
||
size_t
|
||
ss_length(const struct sockaddr_storage *ss)
|
||
{
|
||
switch (ss->ss_family) {
|
||
case AF_INET:
|
||
return sizeof(struct sockaddr_in);
|
||
|
||
case AF_INET6:
|
||
return sizeof(struct sockaddr_in6);
|
||
|
||
default:
|
||
OVS_NOT_REACHED();
|
||
}
|
||
}
|
||
|
||
/* For Windows socket calls, 'errno' is not set. One has to call
|
||
* WSAGetLastError() to get the error number and then pass it to
|
||
* this function to get the correct error string.
|
||
*
|
||
* ovs_strerror() calls strerror_r() and would not get the correct error
|
||
* string for Windows sockets, but is good for POSIX. */
|
||
const char *
|
||
sock_strerror(int error)
|
||
{
|
||
#ifdef _WIN32
|
||
return ovs_format_message(error);
|
||
#else
|
||
return ovs_strerror(error);
|
||
#endif
|
||
}
|