1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
/*
* 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-common.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 (qemu_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;
}
|
