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/*
* Helper functions for tests using sockets
*
* Copyright 2015-2018 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "qemu/sockets.h"
#include "socket-helpers.h"
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif
#ifndef EAI_ADDRFAMILY
# define EAI_ADDRFAMILY 0
#endif
/*
* @hostname: a DNS name or numeric IP address
*
* Check whether it is possible to bind & connect to ports
* on the DNS name or IP address @hostname. If an IP address
* is used, it must not be a wildcard address.
*
* Returns 0 on success, -1 on error with errno set
*/
static int socket_can_bind_connect(const char *hostname, int family)
{
int lfd = -1, cfd = -1, afd = -1;
struct addrinfo ai, *res = NULL;
struct sockaddr_storage ss;
socklen_t sslen = sizeof(ss);
int soerr;
socklen_t soerrlen = sizeof(soerr);
bool check_soerr = false;
int rc;
int ret = -1;
memset(&ai, 0, sizeof(ai));
ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
ai.ai_family = family;
ai.ai_socktype = SOCK_STREAM;
/* lookup */
rc = getaddrinfo(hostname, NULL, &ai, &res);
if (rc != 0) {
if (rc == EAI_ADDRFAMILY || rc == EAI_FAMILY || rc == EAI_NONAME) {
errno = EADDRNOTAVAIL;
} else {
errno = EINVAL;
}
goto cleanup;
}
lfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (lfd < 0) {
goto cleanup;
}
cfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (cfd < 0) {
goto cleanup;
}
if (bind(lfd, res->ai_addr, res->ai_addrlen) < 0) {
goto cleanup;
}
if (listen(lfd, 1) < 0) {
goto cleanup;
}
if (getsockname(lfd, (struct sockaddr *)&ss, &sslen) < 0) {
goto cleanup;
}
qemu_set_nonblock(cfd);
if (connect(cfd, (struct sockaddr *)&ss, sslen) < 0) {
if (errno == EINPROGRESS) {
check_soerr = true;
} else {
goto cleanup;
}
}
sslen = sizeof(ss);
afd = accept(lfd, (struct sockaddr *)&ss, &sslen);
if (afd < 0) {
goto cleanup;
}
if (check_soerr) {
if (getsockopt(cfd, SOL_SOCKET, SO_ERROR, &soerr, &soerrlen) < 0) {
goto cleanup;
}
if (soerr) {
errno = soerr;
goto cleanup;
}
}
ret = 0;
cleanup:
if (afd != -1) {
close(afd);
}
if (cfd != -1) {
close(cfd);
}
if (lfd != -1) {
close(lfd);
}
if (res) {
freeaddrinfo(res);
}
return ret;
}
int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
{
*has_ipv4 = *has_ipv6 = false;
if (socket_can_bind_connect("127.0.0.1", PF_INET) < 0) {
if (errno != EADDRNOTAVAIL) {
return -1;
}
} else {
*has_ipv4 = true;
}
if (socket_can_bind_connect("::1", PF_INET6) < 0) {
if (errno != EADDRNOTAVAIL) {
return -1;
}
} else {
*has_ipv6 = true;
}
return 0;
}
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