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c1b412f1d9
Currently DNS resolution is done automatically as part of the creation of a QIOChannelSocket object instance. This works ok for network clients where you just end up a single network socket, but for servers, the results of DNS resolution may require creation of multiple sockets. Introducing a DNS resolver API allows DNS resolution to be separated from the socket object creation. This will make it practical to create multiple QIOChannelSocket instances for servers. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
1347 lines
36 KiB
C
1347 lines
36 KiB
C
/*
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* inet and unix socket functions for qemu
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*
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* (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#ifdef CONFIG_AF_VSOCK
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#include <linux/vm_sockets.h>
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#endif /* CONFIG_AF_VSOCK */
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#include "monitor/monitor.h"
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#include "qapi/error.h"
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#include "qemu/sockets.h"
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#include "qemu/main-loop.h"
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#include "qapi/qobject-input-visitor.h"
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#include "qapi/qobject-output-visitor.h"
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#include "qapi-visit.h"
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#include "qemu/cutils.h"
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#ifndef AI_ADDRCONFIG
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# define AI_ADDRCONFIG 0
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#endif
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#ifndef AI_V4MAPPED
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# define AI_V4MAPPED 0
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#endif
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#ifndef AI_NUMERICSERV
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# define AI_NUMERICSERV 0
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#endif
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static int inet_getport(struct addrinfo *e)
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{
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struct sockaddr_in *i4;
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struct sockaddr_in6 *i6;
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switch (e->ai_family) {
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case PF_INET6:
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i6 = (void*)e->ai_addr;
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return ntohs(i6->sin6_port);
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case PF_INET:
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i4 = (void*)e->ai_addr;
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return ntohs(i4->sin_port);
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default:
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return 0;
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}
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}
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static void inet_setport(struct addrinfo *e, int port)
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{
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struct sockaddr_in *i4;
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struct sockaddr_in6 *i6;
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switch (e->ai_family) {
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case PF_INET6:
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i6 = (void*)e->ai_addr;
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i6->sin6_port = htons(port);
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break;
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case PF_INET:
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i4 = (void*)e->ai_addr;
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i4->sin_port = htons(port);
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break;
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}
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}
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NetworkAddressFamily inet_netfamily(int family)
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{
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switch (family) {
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case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
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case PF_INET: return NETWORK_ADDRESS_FAMILY_IPV4;
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case PF_UNIX: return NETWORK_ADDRESS_FAMILY_UNIX;
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#ifdef CONFIG_AF_VSOCK
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case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK;
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#endif /* CONFIG_AF_VSOCK */
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}
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return NETWORK_ADDRESS_FAMILY_UNKNOWN;
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}
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/*
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* Matrix we're trying to apply
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*
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* ipv4 ipv6 family
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* - - PF_UNSPEC
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* - f PF_INET
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* - t PF_INET6
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* f - PF_INET6
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* f f <error>
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* f t PF_INET6
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* t - PF_INET
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* t f PF_INET
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* t t PF_INET6
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*
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* NB, this matrix is only about getting the necessary results
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* from getaddrinfo(). Some of the cases require further work
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* after reading results from getaddrinfo in order to fully
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* apply the logic the end user wants. eg with the last case
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* ipv4=t + ipv6=t + PF_INET6, getaddrinfo alone can only
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* guarantee the ipv6=t part of the request - we need more
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* checks to provide ipv4=t part of the guarantee. This is
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* outside scope of this method and not currently handled by
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* callers at all.
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*/
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int inet_ai_family_from_address(InetSocketAddress *addr,
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Error **errp)
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{
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if (addr->has_ipv6 && addr->has_ipv4 &&
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!addr->ipv6 && !addr->ipv4) {
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error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
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return PF_UNSPEC;
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}
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if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
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return PF_INET6;
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}
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if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
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return PF_INET;
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}
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return PF_UNSPEC;
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}
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static int inet_listen_saddr(InetSocketAddress *saddr,
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int port_offset,
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bool update_addr,
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Error **errp)
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{
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struct addrinfo ai,*res,*e;
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char port[33];
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char uaddr[INET6_ADDRSTRLEN+1];
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char uport[33];
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int slisten, rc, port_min, port_max, p;
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Error *err = NULL;
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memset(&ai,0, sizeof(ai));
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ai.ai_flags = AI_PASSIVE;
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if (saddr->has_numeric && saddr->numeric) {
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ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
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}
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ai.ai_family = inet_ai_family_from_address(saddr, &err);
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ai.ai_socktype = SOCK_STREAM;
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if (err) {
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error_propagate(errp, err);
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return -1;
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}
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if (saddr->host == NULL) {
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error_setg(errp, "host not specified");
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return -1;
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}
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if (saddr->port != NULL) {
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pstrcpy(port, sizeof(port), saddr->port);
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} else {
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port[0] = '\0';
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}
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/* lookup */
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if (port_offset) {
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unsigned long long baseport;
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if (strlen(port) == 0) {
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error_setg(errp, "port not specified");
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return -1;
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}
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if (parse_uint_full(port, &baseport, 10) < 0) {
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error_setg(errp, "can't convert to a number: %s", port);
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return -1;
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}
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if (baseport > 65535 ||
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baseport + port_offset > 65535) {
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error_setg(errp, "port %s out of range", port);
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return -1;
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}
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snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
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}
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rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
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strlen(port) ? port : NULL, &ai, &res);
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if (rc != 0) {
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error_setg(errp, "address resolution failed for %s:%s: %s",
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saddr->host, port, gai_strerror(rc));
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return -1;
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}
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/* create socket + bind */
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for (e = res; e != NULL; e = e->ai_next) {
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getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
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uaddr,INET6_ADDRSTRLEN,uport,32,
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NI_NUMERICHOST | NI_NUMERICSERV);
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slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
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if (slisten < 0) {
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if (!e->ai_next) {
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error_setg_errno(errp, errno, "Failed to create socket");
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}
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continue;
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}
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socket_set_fast_reuse(slisten);
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#ifdef IPV6_V6ONLY
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if (e->ai_family == PF_INET6) {
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/* listen on both ipv4 and ipv6 */
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const int off = 0;
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qemu_setsockopt(slisten, IPPROTO_IPV6, IPV6_V6ONLY, &off,
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sizeof(off));
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}
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#endif
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port_min = inet_getport(e);
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port_max = saddr->has_to ? saddr->to + port_offset : port_min;
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for (p = port_min; p <= port_max; p++) {
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inet_setport(e, p);
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if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
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goto listen;
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}
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if (p == port_max) {
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if (!e->ai_next) {
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error_setg_errno(errp, errno, "Failed to bind socket");
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}
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}
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}
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closesocket(slisten);
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}
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freeaddrinfo(res);
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return -1;
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listen:
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if (listen(slisten,1) != 0) {
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error_setg_errno(errp, errno, "Failed to listen on socket");
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closesocket(slisten);
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freeaddrinfo(res);
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return -1;
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}
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if (update_addr) {
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g_free(saddr->host);
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saddr->host = g_strdup(uaddr);
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g_free(saddr->port);
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saddr->port = g_strdup_printf("%d",
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inet_getport(e) - port_offset);
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saddr->has_ipv6 = saddr->ipv6 = e->ai_family == PF_INET6;
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saddr->has_ipv4 = saddr->ipv4 = e->ai_family != PF_INET6;
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}
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freeaddrinfo(res);
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return slisten;
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}
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#ifdef _WIN32
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#define QEMU_SOCKET_RC_INPROGRESS(rc) \
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((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
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#else
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#define QEMU_SOCKET_RC_INPROGRESS(rc) \
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((rc) == -EINPROGRESS)
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#endif
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/* Struct to store connect state for non blocking connect */
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typedef struct ConnectState {
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int fd;
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struct addrinfo *addr_list;
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struct addrinfo *current_addr;
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NonBlockingConnectHandler *callback;
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void *opaque;
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} ConnectState;
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static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
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ConnectState *connect_state, Error **errp);
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static void wait_for_connect(void *opaque)
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{
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ConnectState *s = opaque;
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int val = 0, rc = 0;
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socklen_t valsize = sizeof(val);
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bool in_progress;
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Error *err = NULL;
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qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
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do {
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rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
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} while (rc == -1 && errno == EINTR);
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/* update rc to contain error */
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if (!rc && val) {
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rc = -1;
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errno = val;
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}
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/* connect error */
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if (rc < 0) {
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error_setg_errno(&err, errno, "Error connecting to socket");
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closesocket(s->fd);
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s->fd = rc;
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}
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/* try to connect to the next address on the list */
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if (s->current_addr) {
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while (s->current_addr->ai_next != NULL && s->fd < 0) {
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s->current_addr = s->current_addr->ai_next;
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s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
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if (s->fd < 0) {
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error_free(err);
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err = NULL;
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error_setg_errno(&err, errno, "Unable to start socket connect");
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}
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/* connect in progress */
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if (in_progress) {
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goto out;
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}
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}
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freeaddrinfo(s->addr_list);
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}
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if (s->callback) {
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s->callback(s->fd, err, s->opaque);
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}
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g_free(s);
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out:
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error_free(err);
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}
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static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
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ConnectState *connect_state, Error **errp)
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{
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int sock, rc;
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*in_progress = false;
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sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
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if (sock < 0) {
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error_setg_errno(errp, errno, "Failed to create socket");
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return -1;
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}
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socket_set_fast_reuse(sock);
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if (connect_state != NULL) {
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qemu_set_nonblock(sock);
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}
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/* connect to peer */
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do {
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rc = 0;
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if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
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rc = -errno;
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}
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} while (rc == -EINTR);
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if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
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connect_state->fd = sock;
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qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
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*in_progress = true;
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} else if (rc < 0) {
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error_setg_errno(errp, errno, "Failed to connect socket");
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closesocket(sock);
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return -1;
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}
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return sock;
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}
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static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
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Error **errp)
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{
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struct addrinfo ai, *res;
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int rc;
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Error *err = NULL;
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static int useV4Mapped = 1;
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memset(&ai, 0, sizeof(ai));
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ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
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if (atomic_read(&useV4Mapped)) {
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ai.ai_flags |= AI_V4MAPPED;
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}
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ai.ai_family = inet_ai_family_from_address(saddr, &err);
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ai.ai_socktype = SOCK_STREAM;
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if (err) {
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error_propagate(errp, err);
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return NULL;
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}
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if (saddr->host == NULL || saddr->port == NULL) {
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error_setg(errp, "host and/or port not specified");
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return NULL;
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}
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|
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/* lookup */
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rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
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|
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/* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
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* then don't implement it in their getaddrinfo(). Detect
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* this and retry without the flag since that's preferrable
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* to a fatal error
|
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*/
|
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if (rc == EAI_BADFLAGS &&
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(ai.ai_flags & AI_V4MAPPED)) {
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atomic_set(&useV4Mapped, 0);
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ai.ai_flags &= ~AI_V4MAPPED;
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rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
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}
|
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if (rc != 0) {
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error_setg(errp, "address resolution failed for %s:%s: %s",
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saddr->host, saddr->port, gai_strerror(rc));
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return NULL;
|
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}
|
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return res;
|
|
}
|
|
|
|
/**
|
|
* Create a socket and connect it to an address.
|
|
*
|
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* @saddr: Inet socket address specification
|
|
* @errp: set on error
|
|
* @callback: callback function for non-blocking connect
|
|
* @opaque: opaque for callback function
|
|
*
|
|
* Returns: -1 on error, file descriptor on success.
|
|
*
|
|
* If @callback is non-null, the connect is non-blocking. If this
|
|
* function succeeds, callback will be called when the connection
|
|
* completes, with the file descriptor on success, or -1 on error.
|
|
*/
|
|
int inet_connect_saddr(InetSocketAddress *saddr, Error **errp,
|
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NonBlockingConnectHandler *callback, void *opaque)
|
|
{
|
|
Error *local_err = NULL;
|
|
struct addrinfo *res, *e;
|
|
int sock = -1;
|
|
bool in_progress;
|
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ConnectState *connect_state = NULL;
|
|
|
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res = inet_parse_connect_saddr(saddr, errp);
|
|
if (!res) {
|
|
return -1;
|
|
}
|
|
|
|
if (callback != NULL) {
|
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connect_state = g_malloc0(sizeof(*connect_state));
|
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connect_state->addr_list = res;
|
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connect_state->callback = callback;
|
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connect_state->opaque = opaque;
|
|
}
|
|
|
|
for (e = res; e != NULL; e = e->ai_next) {
|
|
error_free(local_err);
|
|
local_err = NULL;
|
|
if (connect_state != NULL) {
|
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connect_state->current_addr = e;
|
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}
|
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sock = inet_connect_addr(e, &in_progress, connect_state, &local_err);
|
|
if (sock >= 0) {
|
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break;
|
|
}
|
|
}
|
|
|
|
if (sock < 0) {
|
|
error_propagate(errp, local_err);
|
|
} else if (in_progress) {
|
|
/* wait_for_connect() will do the rest */
|
|
return sock;
|
|
} else {
|
|
if (callback) {
|
|
callback(sock, NULL, opaque);
|
|
}
|
|
}
|
|
g_free(connect_state);
|
|
freeaddrinfo(res);
|
|
return sock;
|
|
}
|
|
|
|
static int inet_dgram_saddr(InetSocketAddress *sraddr,
|
|
InetSocketAddress *sladdr,
|
|
Error **errp)
|
|
{
|
|
struct addrinfo ai, *peer = NULL, *local = NULL;
|
|
const char *addr;
|
|
const char *port;
|
|
int sock = -1, rc;
|
|
Error *err = NULL;
|
|
|
|
/* lookup peer addr */
|
|
memset(&ai,0, sizeof(ai));
|
|
ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
|
|
ai.ai_family = inet_ai_family_from_address(sraddr, &err);
|
|
ai.ai_socktype = SOCK_DGRAM;
|
|
|
|
if (err) {
|
|
error_propagate(errp, err);
|
|
goto err;
|
|
}
|
|
|
|
addr = sraddr->host;
|
|
port = sraddr->port;
|
|
if (addr == NULL || strlen(addr) == 0) {
|
|
addr = "localhost";
|
|
}
|
|
if (port == NULL || strlen(port) == 0) {
|
|
error_setg(errp, "remote port not specified");
|
|
goto err;
|
|
}
|
|
|
|
if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
|
|
error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
|
|
gai_strerror(rc));
|
|
goto err;
|
|
}
|
|
|
|
/* lookup local addr */
|
|
memset(&ai,0, sizeof(ai));
|
|
ai.ai_flags = AI_PASSIVE;
|
|
ai.ai_family = peer->ai_family;
|
|
ai.ai_socktype = SOCK_DGRAM;
|
|
|
|
if (sladdr) {
|
|
addr = sladdr->host;
|
|
port = sladdr->port;
|
|
if (addr == NULL || strlen(addr) == 0) {
|
|
addr = NULL;
|
|
}
|
|
if (!port || strlen(port) == 0) {
|
|
port = "0";
|
|
}
|
|
} else {
|
|
addr = NULL;
|
|
port = "0";
|
|
}
|
|
|
|
if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
|
|
error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
|
|
gai_strerror(rc));
|
|
goto err;
|
|
}
|
|
|
|
/* create socket */
|
|
sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
|
|
if (sock < 0) {
|
|
error_setg_errno(errp, errno, "Failed to create socket");
|
|
goto err;
|
|
}
|
|
socket_set_fast_reuse(sock);
|
|
|
|
/* bind socket */
|
|
if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
|
|
error_setg_errno(errp, errno, "Failed to bind socket");
|
|
goto err;
|
|
}
|
|
|
|
/* connect to peer */
|
|
if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
|
|
error_setg_errno(errp, errno, "Failed to connect socket");
|
|
goto err;
|
|
}
|
|
|
|
freeaddrinfo(local);
|
|
freeaddrinfo(peer);
|
|
return sock;
|
|
|
|
err:
|
|
if (sock != -1) {
|
|
closesocket(sock);
|
|
}
|
|
if (local) {
|
|
freeaddrinfo(local);
|
|
}
|
|
if (peer) {
|
|
freeaddrinfo(peer);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/* compatibility wrapper */
|
|
InetSocketAddress *inet_parse(const char *str, Error **errp)
|
|
{
|
|
InetSocketAddress *addr;
|
|
const char *optstr, *h;
|
|
char host[65];
|
|
char port[33];
|
|
int to;
|
|
int pos;
|
|
|
|
addr = g_new0(InetSocketAddress, 1);
|
|
|
|
/* parse address */
|
|
if (str[0] == ':') {
|
|
/* no host given */
|
|
host[0] = '\0';
|
|
if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
|
|
error_setg(errp, "error parsing port in address '%s'", str);
|
|
goto fail;
|
|
}
|
|
} else if (str[0] == '[') {
|
|
/* IPv6 addr */
|
|
if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
|
|
error_setg(errp, "error parsing IPv6 address '%s'", str);
|
|
goto fail;
|
|
}
|
|
addr->ipv6 = addr->has_ipv6 = true;
|
|
} else {
|
|
/* hostname or IPv4 addr */
|
|
if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
|
|
error_setg(errp, "error parsing address '%s'", str);
|
|
goto fail;
|
|
}
|
|
if (host[strspn(host, "0123456789.")] == '\0') {
|
|
addr->ipv4 = addr->has_ipv4 = true;
|
|
}
|
|
}
|
|
|
|
addr->host = g_strdup(host);
|
|
addr->port = g_strdup(port);
|
|
|
|
/* parse options */
|
|
optstr = str + pos;
|
|
h = strstr(optstr, ",to=");
|
|
if (h) {
|
|
h += 4;
|
|
if (sscanf(h, "%d%n", &to, &pos) != 1 ||
|
|
(h[pos] != '\0' && h[pos] != ',')) {
|
|
error_setg(errp, "error parsing to= argument");
|
|
goto fail;
|
|
}
|
|
addr->has_to = true;
|
|
addr->to = to;
|
|
}
|
|
if (strstr(optstr, ",ipv4")) {
|
|
addr->ipv4 = addr->has_ipv4 = true;
|
|
}
|
|
if (strstr(optstr, ",ipv6")) {
|
|
addr->ipv6 = addr->has_ipv6 = true;
|
|
}
|
|
return addr;
|
|
|
|
fail:
|
|
qapi_free_InetSocketAddress(addr);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/**
|
|
* Create a blocking socket and connect it to an address.
|
|
*
|
|
* @str: address string
|
|
* @errp: set in case of an error
|
|
*
|
|
* Returns -1 in case of error, file descriptor on success
|
|
**/
|
|
int inet_connect(const char *str, Error **errp)
|
|
{
|
|
int sock = -1;
|
|
InetSocketAddress *addr;
|
|
|
|
addr = inet_parse(str, errp);
|
|
if (addr != NULL) {
|
|
sock = inet_connect_saddr(addr, errp, NULL, NULL);
|
|
qapi_free_InetSocketAddress(addr);
|
|
}
|
|
return sock;
|
|
}
|
|
|
|
#ifdef CONFIG_AF_VSOCK
|
|
static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
|
|
struct sockaddr_vm *svm,
|
|
Error **errp)
|
|
{
|
|
unsigned long long val;
|
|
|
|
memset(svm, 0, sizeof(*svm));
|
|
svm->svm_family = AF_VSOCK;
|
|
|
|
if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
|
|
val > UINT32_MAX) {
|
|
error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
|
|
return false;
|
|
}
|
|
svm->svm_cid = val;
|
|
|
|
if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
|
|
val > UINT32_MAX) {
|
|
error_setg(errp, "Failed to parse port '%s'", vaddr->port);
|
|
return false;
|
|
}
|
|
svm->svm_port = val;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int vsock_connect_addr(const struct sockaddr_vm *svm, bool *in_progress,
|
|
ConnectState *connect_state, Error **errp)
|
|
{
|
|
int sock, rc;
|
|
|
|
*in_progress = false;
|
|
|
|
sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
|
|
if (sock < 0) {
|
|
error_setg_errno(errp, errno, "Failed to create socket");
|
|
return -1;
|
|
}
|
|
if (connect_state != NULL) {
|
|
qemu_set_nonblock(sock);
|
|
}
|
|
/* connect to peer */
|
|
do {
|
|
rc = 0;
|
|
if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
|
|
rc = -errno;
|
|
}
|
|
} while (rc == -EINTR);
|
|
|
|
if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
|
|
connect_state->fd = sock;
|
|
qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
|
|
*in_progress = true;
|
|
} else if (rc < 0) {
|
|
error_setg_errno(errp, errno, "Failed to connect socket");
|
|
closesocket(sock);
|
|
return -1;
|
|
}
|
|
return sock;
|
|
}
|
|
|
|
static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp,
|
|
NonBlockingConnectHandler *callback,
|
|
void *opaque)
|
|
{
|
|
struct sockaddr_vm svm;
|
|
int sock = -1;
|
|
bool in_progress;
|
|
ConnectState *connect_state = NULL;
|
|
|
|
if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
|
|
return -1;
|
|
}
|
|
|
|
if (callback != NULL) {
|
|
connect_state = g_malloc0(sizeof(*connect_state));
|
|
connect_state->callback = callback;
|
|
connect_state->opaque = opaque;
|
|
}
|
|
|
|
sock = vsock_connect_addr(&svm, &in_progress, connect_state, errp);
|
|
if (sock < 0) {
|
|
/* do nothing */
|
|
} else if (in_progress) {
|
|
/* wait_for_connect() will do the rest */
|
|
return sock;
|
|
} else {
|
|
if (callback) {
|
|
callback(sock, NULL, opaque);
|
|
}
|
|
}
|
|
g_free(connect_state);
|
|
return sock;
|
|
}
|
|
|
|
static int vsock_listen_saddr(VsockSocketAddress *vaddr,
|
|
Error **errp)
|
|
{
|
|
struct sockaddr_vm svm;
|
|
int slisten;
|
|
|
|
if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
|
|
return -1;
|
|
}
|
|
|
|
slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
|
|
if (slisten < 0) {
|
|
error_setg_errno(errp, errno, "Failed to create socket");
|
|
return -1;
|
|
}
|
|
|
|
if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
|
|
error_setg_errno(errp, errno, "Failed to bind socket");
|
|
closesocket(slisten);
|
|
return -1;
|
|
}
|
|
|
|
if (listen(slisten, 1) != 0) {
|
|
error_setg_errno(errp, errno, "Failed to listen on socket");
|
|
closesocket(slisten);
|
|
return -1;
|
|
}
|
|
return slisten;
|
|
}
|
|
|
|
static VsockSocketAddress *vsock_parse(const char *str, Error **errp)
|
|
{
|
|
VsockSocketAddress *addr = NULL;
|
|
char cid[33];
|
|
char port[33];
|
|
int n;
|
|
|
|
if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
|
|
error_setg(errp, "error parsing address '%s'", str);
|
|
return NULL;
|
|
}
|
|
if (str[n] != '\0') {
|
|
error_setg(errp, "trailing characters in address '%s'", str);
|
|
return NULL;
|
|
}
|
|
|
|
addr = g_new0(VsockSocketAddress, 1);
|
|
addr->cid = g_strdup(cid);
|
|
addr->port = g_strdup(port);
|
|
return addr;
|
|
}
|
|
#else
|
|
static void vsock_unsupported(Error **errp)
|
|
{
|
|
error_setg(errp, "socket family AF_VSOCK unsupported");
|
|
}
|
|
|
|
static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp,
|
|
NonBlockingConnectHandler *callback,
|
|
void *opaque)
|
|
{
|
|
vsock_unsupported(errp);
|
|
return -1;
|
|
}
|
|
|
|
static int vsock_listen_saddr(VsockSocketAddress *vaddr,
|
|
Error **errp)
|
|
{
|
|
vsock_unsupported(errp);
|
|
return -1;
|
|
}
|
|
|
|
static VsockSocketAddress *vsock_parse(const char *str, Error **errp)
|
|
{
|
|
vsock_unsupported(errp);
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_AF_VSOCK */
|
|
|
|
#ifndef _WIN32
|
|
|
|
static int unix_listen_saddr(UnixSocketAddress *saddr,
|
|
bool update_addr,
|
|
Error **errp)
|
|
{
|
|
struct sockaddr_un un;
|
|
int sock, fd;
|
|
|
|
sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
|
|
if (sock < 0) {
|
|
error_setg_errno(errp, errno, "Failed to create Unix socket");
|
|
return -1;
|
|
}
|
|
|
|
memset(&un, 0, sizeof(un));
|
|
un.sun_family = AF_UNIX;
|
|
if (saddr->path && strlen(saddr->path)) {
|
|
snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
|
|
} else {
|
|
const char *tmpdir = getenv("TMPDIR");
|
|
tmpdir = tmpdir ? tmpdir : "/tmp";
|
|
if (snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
|
|
tmpdir) >= sizeof(un.sun_path)) {
|
|
error_setg_errno(errp, errno,
|
|
"TMPDIR environment variable (%s) too large", tmpdir);
|
|
goto err;
|
|
}
|
|
|
|
/*
|
|
* This dummy fd usage silences the mktemp() unsecure warning.
|
|
* Using mkstemp() doesn't make things more secure here
|
|
* though. bind() complains about existing files, so we have
|
|
* to unlink first and thus re-open the race window. The
|
|
* worst case possible is bind() failing, i.e. a DoS attack.
|
|
*/
|
|
fd = mkstemp(un.sun_path);
|
|
if (fd < 0) {
|
|
error_setg_errno(errp, errno,
|
|
"Failed to make a temporary socket name in %s", tmpdir);
|
|
goto err;
|
|
}
|
|
close(fd);
|
|
if (update_addr) {
|
|
g_free(saddr->path);
|
|
saddr->path = g_strdup(un.sun_path);
|
|
}
|
|
}
|
|
|
|
if (unlink(un.sun_path) < 0 && errno != ENOENT) {
|
|
error_setg_errno(errp, errno,
|
|
"Failed to unlink socket %s", un.sun_path);
|
|
goto err;
|
|
}
|
|
if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
|
|
error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path);
|
|
goto err;
|
|
}
|
|
if (listen(sock, 1) < 0) {
|
|
error_setg_errno(errp, errno, "Failed to listen on socket");
|
|
goto err;
|
|
}
|
|
|
|
return sock;
|
|
|
|
err:
|
|
closesocket(sock);
|
|
return -1;
|
|
}
|
|
|
|
static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
|
|
NonBlockingConnectHandler *callback, void *opaque)
|
|
{
|
|
struct sockaddr_un un;
|
|
ConnectState *connect_state = NULL;
|
|
int sock, rc;
|
|
|
|
if (saddr->path == NULL) {
|
|
error_setg(errp, "unix connect: no path specified");
|
|
return -1;
|
|
}
|
|
|
|
sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
|
|
if (sock < 0) {
|
|
error_setg_errno(errp, errno, "Failed to create socket");
|
|
return -1;
|
|
}
|
|
if (callback != NULL) {
|
|
connect_state = g_malloc0(sizeof(*connect_state));
|
|
connect_state->callback = callback;
|
|
connect_state->opaque = opaque;
|
|
qemu_set_nonblock(sock);
|
|
}
|
|
|
|
memset(&un, 0, sizeof(un));
|
|
un.sun_family = AF_UNIX;
|
|
snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
|
|
|
|
/* connect to peer */
|
|
do {
|
|
rc = 0;
|
|
if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
|
|
rc = -errno;
|
|
}
|
|
} while (rc == -EINTR);
|
|
|
|
if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
|
|
connect_state->fd = sock;
|
|
qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
|
|
return sock;
|
|
} else if (rc >= 0) {
|
|
/* non blocking socket immediate success, call callback */
|
|
if (callback != NULL) {
|
|
callback(sock, NULL, opaque);
|
|
}
|
|
}
|
|
|
|
if (rc < 0) {
|
|
error_setg_errno(errp, -rc, "Failed to connect socket");
|
|
close(sock);
|
|
sock = -1;
|
|
}
|
|
|
|
g_free(connect_state);
|
|
return sock;
|
|
}
|
|
|
|
#else
|
|
|
|
static int unix_listen_saddr(UnixSocketAddress *saddr,
|
|
bool update_addr,
|
|
Error **errp)
|
|
{
|
|
error_setg(errp, "unix sockets are not available on windows");
|
|
errno = ENOTSUP;
|
|
return -1;
|
|
}
|
|
|
|
static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
|
|
NonBlockingConnectHandler *callback, void *opaque)
|
|
{
|
|
error_setg(errp, "unix sockets are not available on windows");
|
|
errno = ENOTSUP;
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
/* compatibility wrapper */
|
|
int unix_listen(const char *str, char *ostr, int olen, Error **errp)
|
|
{
|
|
char *path, *optstr;
|
|
int sock, len;
|
|
UnixSocketAddress *saddr;
|
|
|
|
saddr = g_new0(UnixSocketAddress, 1);
|
|
|
|
optstr = strchr(str, ',');
|
|
if (optstr) {
|
|
len = optstr - str;
|
|
if (len) {
|
|
path = g_malloc(len+1);
|
|
snprintf(path, len+1, "%.*s", len, str);
|
|
saddr->path = path;
|
|
}
|
|
} else {
|
|
saddr->path = g_strdup(str);
|
|
}
|
|
|
|
sock = unix_listen_saddr(saddr, true, errp);
|
|
|
|
if (sock != -1 && ostr) {
|
|
snprintf(ostr, olen, "%s%s", saddr->path, optstr ? optstr : "");
|
|
}
|
|
|
|
qapi_free_UnixSocketAddress(saddr);
|
|
return sock;
|
|
}
|
|
|
|
int unix_connect(const char *path, Error **errp)
|
|
{
|
|
UnixSocketAddress *saddr;
|
|
int sock;
|
|
|
|
saddr = g_new0(UnixSocketAddress, 1);
|
|
saddr->path = g_strdup(path);
|
|
sock = unix_connect_saddr(saddr, errp, NULL, NULL);
|
|
qapi_free_UnixSocketAddress(saddr);
|
|
return sock;
|
|
}
|
|
|
|
|
|
SocketAddress *socket_parse(const char *str, Error **errp)
|
|
{
|
|
SocketAddress *addr;
|
|
|
|
addr = g_new0(SocketAddress, 1);
|
|
if (strstart(str, "unix:", NULL)) {
|
|
if (str[5] == '\0') {
|
|
error_setg(errp, "invalid Unix socket address");
|
|
goto fail;
|
|
} else {
|
|
addr->type = SOCKET_ADDRESS_KIND_UNIX;
|
|
addr->u.q_unix.data = g_new(UnixSocketAddress, 1);
|
|
addr->u.q_unix.data->path = g_strdup(str + 5);
|
|
}
|
|
} else if (strstart(str, "fd:", NULL)) {
|
|
if (str[3] == '\0') {
|
|
error_setg(errp, "invalid file descriptor address");
|
|
goto fail;
|
|
} else {
|
|
addr->type = SOCKET_ADDRESS_KIND_FD;
|
|
addr->u.fd.data = g_new(String, 1);
|
|
addr->u.fd.data->str = g_strdup(str + 3);
|
|
}
|
|
} else if (strstart(str, "vsock:", NULL)) {
|
|
addr->type = SOCKET_ADDRESS_KIND_VSOCK;
|
|
addr->u.vsock.data = vsock_parse(str + strlen("vsock:"), errp);
|
|
if (addr->u.vsock.data == NULL) {
|
|
goto fail;
|
|
}
|
|
} else {
|
|
addr->type = SOCKET_ADDRESS_KIND_INET;
|
|
addr->u.inet.data = inet_parse(str, errp);
|
|
if (addr->u.inet.data == NULL) {
|
|
goto fail;
|
|
}
|
|
}
|
|
return addr;
|
|
|
|
fail:
|
|
qapi_free_SocketAddress(addr);
|
|
return NULL;
|
|
}
|
|
|
|
int socket_connect(SocketAddress *addr, Error **errp,
|
|
NonBlockingConnectHandler *callback, void *opaque)
|
|
{
|
|
int fd;
|
|
|
|
switch (addr->type) {
|
|
case SOCKET_ADDRESS_KIND_INET:
|
|
fd = inet_connect_saddr(addr->u.inet.data, errp, callback, opaque);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_UNIX:
|
|
fd = unix_connect_saddr(addr->u.q_unix.data, errp, callback, opaque);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_FD:
|
|
fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
|
|
if (fd >= 0 && callback) {
|
|
qemu_set_nonblock(fd);
|
|
callback(fd, NULL, opaque);
|
|
}
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_VSOCK:
|
|
fd = vsock_connect_saddr(addr->u.vsock.data, errp, callback, opaque);
|
|
break;
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
int socket_listen(SocketAddress *addr, Error **errp)
|
|
{
|
|
int fd;
|
|
|
|
switch (addr->type) {
|
|
case SOCKET_ADDRESS_KIND_INET:
|
|
fd = inet_listen_saddr(addr->u.inet.data, 0, false, errp);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_UNIX:
|
|
fd = unix_listen_saddr(addr->u.q_unix.data, false, errp);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_FD:
|
|
fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_VSOCK:
|
|
fd = vsock_listen_saddr(addr->u.vsock.data, errp);
|
|
break;
|
|
|
|
default:
|
|
abort();
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
void socket_listen_cleanup(int fd, Error **errp)
|
|
{
|
|
SocketAddress *addr;
|
|
|
|
addr = socket_local_address(fd, errp);
|
|
|
|
if (addr->type == SOCKET_ADDRESS_KIND_UNIX
|
|
&& addr->u.q_unix.data->path) {
|
|
if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
|
|
error_setg_errno(errp, errno,
|
|
"Failed to unlink socket %s",
|
|
addr->u.q_unix.data->path);
|
|
}
|
|
}
|
|
|
|
qapi_free_SocketAddress(addr);
|
|
}
|
|
|
|
int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
|
|
{
|
|
int fd;
|
|
|
|
switch (remote->type) {
|
|
case SOCKET_ADDRESS_KIND_INET:
|
|
fd = inet_dgram_saddr(remote->u.inet.data,
|
|
local ? local->u.inet.data : NULL, errp);
|
|
break;
|
|
|
|
default:
|
|
error_setg(errp, "socket type unsupported for datagram");
|
|
fd = -1;
|
|
}
|
|
return fd;
|
|
}
|
|
|
|
|
|
static SocketAddress *
|
|
socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
|
|
socklen_t salen,
|
|
Error **errp)
|
|
{
|
|
char host[NI_MAXHOST];
|
|
char serv[NI_MAXSERV];
|
|
SocketAddress *addr;
|
|
InetSocketAddress *inet;
|
|
int ret;
|
|
|
|
ret = getnameinfo((struct sockaddr *)sa, salen,
|
|
host, sizeof(host),
|
|
serv, sizeof(serv),
|
|
NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (ret != 0) {
|
|
error_setg(errp, "Cannot format numeric socket address: %s",
|
|
gai_strerror(ret));
|
|
return NULL;
|
|
}
|
|
|
|
addr = g_new0(SocketAddress, 1);
|
|
addr->type = SOCKET_ADDRESS_KIND_INET;
|
|
inet = addr->u.inet.data = g_new0(InetSocketAddress, 1);
|
|
inet->host = g_strdup(host);
|
|
inet->port = g_strdup(serv);
|
|
if (sa->ss_family == AF_INET) {
|
|
inet->has_ipv4 = inet->ipv4 = true;
|
|
} else {
|
|
inet->has_ipv6 = inet->ipv6 = true;
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
|
|
|
|
#ifndef WIN32
|
|
static SocketAddress *
|
|
socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
|
|
socklen_t salen,
|
|
Error **errp)
|
|
{
|
|
SocketAddress *addr;
|
|
struct sockaddr_un *su = (struct sockaddr_un *)sa;
|
|
|
|
addr = g_new0(SocketAddress, 1);
|
|
addr->type = SOCKET_ADDRESS_KIND_UNIX;
|
|
addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
|
|
if (su->sun_path[0]) {
|
|
addr->u.q_unix.data->path = g_strndup(su->sun_path,
|
|
sizeof(su->sun_path));
|
|
}
|
|
|
|
return addr;
|
|
}
|
|
#endif /* WIN32 */
|
|
|
|
#ifdef CONFIG_AF_VSOCK
|
|
static SocketAddress *
|
|
socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
|
|
socklen_t salen,
|
|
Error **errp)
|
|
{
|
|
SocketAddress *addr;
|
|
VsockSocketAddress *vaddr;
|
|
struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
|
|
|
|
addr = g_new0(SocketAddress, 1);
|
|
addr->type = SOCKET_ADDRESS_KIND_VSOCK;
|
|
addr->u.vsock.data = vaddr = g_new0(VsockSocketAddress, 1);
|
|
vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
|
|
vaddr->port = g_strdup_printf("%u", svm->svm_port);
|
|
|
|
return addr;
|
|
}
|
|
#endif /* CONFIG_AF_VSOCK */
|
|
|
|
SocketAddress *
|
|
socket_sockaddr_to_address(struct sockaddr_storage *sa,
|
|
socklen_t salen,
|
|
Error **errp)
|
|
{
|
|
switch (sa->ss_family) {
|
|
case AF_INET:
|
|
case AF_INET6:
|
|
return socket_sockaddr_to_address_inet(sa, salen, errp);
|
|
|
|
#ifndef WIN32
|
|
case AF_UNIX:
|
|
return socket_sockaddr_to_address_unix(sa, salen, errp);
|
|
#endif /* WIN32 */
|
|
|
|
#ifdef CONFIG_AF_VSOCK
|
|
case AF_VSOCK:
|
|
return socket_sockaddr_to_address_vsock(sa, salen, errp);
|
|
#endif
|
|
|
|
default:
|
|
error_setg(errp, "socket family %d unsupported",
|
|
sa->ss_family);
|
|
return NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
SocketAddress *socket_local_address(int fd, Error **errp)
|
|
{
|
|
struct sockaddr_storage ss;
|
|
socklen_t sslen = sizeof(ss);
|
|
|
|
if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
|
|
error_setg_errno(errp, errno, "%s",
|
|
"Unable to query local socket address");
|
|
return NULL;
|
|
}
|
|
|
|
return socket_sockaddr_to_address(&ss, sslen, errp);
|
|
}
|
|
|
|
|
|
SocketAddress *socket_remote_address(int fd, Error **errp)
|
|
{
|
|
struct sockaddr_storage ss;
|
|
socklen_t sslen = sizeof(ss);
|
|
|
|
if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
|
|
error_setg_errno(errp, errno, "%s",
|
|
"Unable to query remote socket address");
|
|
return NULL;
|
|
}
|
|
|
|
return socket_sockaddr_to_address(&ss, sslen, errp);
|
|
}
|
|
|
|
char *socket_address_to_string(struct SocketAddress *addr, Error **errp)
|
|
{
|
|
char *buf;
|
|
InetSocketAddress *inet;
|
|
char host_port[INET6_ADDRSTRLEN + 5 + 4];
|
|
|
|
switch (addr->type) {
|
|
case SOCKET_ADDRESS_KIND_INET:
|
|
inet = addr->u.inet.data;
|
|
if (strchr(inet->host, ':') == NULL) {
|
|
snprintf(host_port, sizeof(host_port), "%s:%s", inet->host,
|
|
inet->port);
|
|
buf = g_strdup(host_port);
|
|
} else {
|
|
snprintf(host_port, sizeof(host_port), "[%s]:%s", inet->host,
|
|
inet->port);
|
|
buf = g_strdup(host_port);
|
|
}
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_UNIX:
|
|
buf = g_strdup(addr->u.q_unix.data->path);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_FD:
|
|
buf = g_strdup(addr->u.fd.data->str);
|
|
break;
|
|
|
|
case SOCKET_ADDRESS_KIND_VSOCK:
|
|
buf = g_strdup_printf("%s:%s",
|
|
addr->u.vsock.data->cid,
|
|
addr->u.vsock.data->port);
|
|
break;
|
|
|
|
default:
|
|
error_setg(errp, "socket family %d unsupported",
|
|
addr->type);
|
|
return NULL;
|
|
}
|
|
return buf;
|
|
}
|