| 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 "qapi/error.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 | */ |
| 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 || rc == EAI_FAMILY || rc == EAI_NONAME) { |
| 63 | errno = EADDRNOTAVAIL; |
| 64 | } else { |
| 65 | errno = EINVAL; |
| 66 | } |
| 67 | goto cleanup; |
| 68 | } |
| 69 | |
| 70 | lfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol); |
| 71 | if (lfd < 0) { |
| 72 | goto cleanup; |
| 73 | } |
| 74 | |
| 75 | cfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol); |
| 76 | if (cfd < 0) { |
| 77 | goto cleanup; |
| 78 | } |
| 79 | |
| 80 | if (bind(lfd, res->ai_addr, res->ai_addrlen) < 0) { |
| 81 | goto cleanup; |
| 82 | } |
| 83 | |
| 84 | if (listen(lfd, 1) < 0) { |
| 85 | goto cleanup; |
| 86 | } |
| 87 | |
| 88 | if (getsockname(lfd, (struct sockaddr *)&ss, &sslen) < 0) { |
| 89 | goto cleanup; |
| 90 | } |
| 91 | |
| 92 | qemu_set_blocking(cfd, false, &error_abort); |
| 93 | |
| 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 (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 | |
| 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 | |
| 160 | void socket_check_afunix_support(bool *has_afunix) |
| 161 | { |
| 162 | int fd; |
| 163 | |
| 164 | fd = socket(PF_UNIX, SOCK_STREAM, 0); |
| 165 | |
| 166 | #ifdef _WIN32 |
| 167 | *has_afunix = (fd != (int)INVALID_SOCKET); |
| 168 | #else |
| 169 | *has_afunix = (fd >= 0); |
| 170 | #endif |
| 171 | |
| 172 | if (*has_afunix) { |
| 173 | close(fd); |
| 174 | } |
| 175 | } |