1 /*
2 * Helper functions for tests using sockets
3 *
4 * Copyright 2015-2018 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 or
9 * (at your option) version 3 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "qemu-common.h"
23 #include "qemu/sockets.h"
24 #include "socket-helpers.h"
25
26 #ifndef AI_ADDRCONFIG
27 # define AI_ADDRCONFIG 0
28 #endif
29 #ifndef EAI_ADDRFAMILY
30 # define EAI_ADDRFAMILY 0
31 #endif
32
33 /*
34 * @hostname: a DNS name or numeric IP address
35 *
36 * Check whether it is possible to bind & connect to ports
37 * on the DNS name or IP address @hostname. If an IP address
38 * is used, it must not be a wildcard address.
39 *
40 * Returns 0 on success, -1 on error with errno set
41 */
socket_can_bind_connect(const char * hostname,int family)42 static int socket_can_bind_connect(const char *hostname, int family)
43 {
44 int lfd = -1, cfd = -1, afd = -1;
45 struct addrinfo ai, *res = NULL;
46 struct sockaddr_storage ss;
47 socklen_t sslen = sizeof(ss);
48 int soerr;
49 socklen_t soerrlen = sizeof(soerr);
50 bool check_soerr = false;
51 int rc;
52 int ret = -1;
53
54 memset(&ai, 0, sizeof(ai));
55 ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
56 ai.ai_family = family;
57 ai.ai_socktype = SOCK_STREAM;
58
59 /* lookup */
60 rc = getaddrinfo(hostname, NULL, &ai, &res);
61 if (rc != 0) {
62 if (rc == EAI_ADDRFAMILY ||
63 rc == EAI_FAMILY) {
64 errno = EADDRNOTAVAIL;
65 } else {
66 errno = EINVAL;
67 }
68 goto cleanup;
69 }
70
71 lfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
72 if (lfd < 0) {
73 goto cleanup;
74 }
75
76 cfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
77 if (cfd < 0) {
78 goto cleanup;
79 }
80
81 if (bind(lfd, res->ai_addr, res->ai_addrlen) < 0) {
82 goto cleanup;
83 }
84
85 if (listen(lfd, 1) < 0) {
86 goto cleanup;
87 }
88
89 if (getsockname(lfd, (struct sockaddr *)&ss, &sslen) < 0) {
90 goto cleanup;
91 }
92
93 qemu_set_nonblock(cfd);
94 if (connect(cfd, (struct sockaddr *)&ss, sslen) < 0) {
95 if (errno == EINPROGRESS) {
96 check_soerr = true;
97 } else {
98 goto cleanup;
99 }
100 }
101
102 sslen = sizeof(ss);
103 afd = accept(lfd, (struct sockaddr *)&ss, &sslen);
104 if (afd < 0) {
105 goto cleanup;
106 }
107
108 if (check_soerr) {
109 if (qemu_getsockopt(cfd, SOL_SOCKET, SO_ERROR, &soerr, &soerrlen) < 0) {
110 goto cleanup;
111 }
112 if (soerr) {
113 errno = soerr;
114 goto cleanup;
115 }
116 }
117
118 ret = 0;
119
120 cleanup:
121 if (afd != -1) {
122 close(afd);
123 }
124 if (cfd != -1) {
125 close(cfd);
126 }
127 if (lfd != -1) {
128 close(lfd);
129 }
130 if (res) {
131 freeaddrinfo(res);
132 }
133 return ret;
134 }
135
136
socket_check_protocol_support(bool * has_ipv4,bool * has_ipv6)137 int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
138 {
139 *has_ipv4 = *has_ipv6 = false;
140
141 if (socket_can_bind_connect("127.0.0.1", PF_INET) < 0) {
142 if (errno != EADDRNOTAVAIL) {
143 return -1;
144 }
145 } else {
146 *has_ipv4 = true;
147 }
148
149 if (socket_can_bind_connect("::1", PF_INET6) < 0) {
150 if (errno != EADDRNOTAVAIL) {
151 return -1;
152 }
153 } else {
154 *has_ipv6 = true;
155 }
156
157 return 0;
158 }
159