tests/unit/socket-helpers.c

   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/sockets.h"
  23 #include "socket-helpers.h"
  24
  25 #ifndef AI_ADDRCONFIG
  26 # define AI_ADDRCONFIG 0
  27 #endif
  28 #ifndef EAI_ADDRFAMILY
  29 # define EAI_ADDRFAMILY 0
  30 #endif
  31
  32 /*
  33  * @hostname: a DNS name or numeric IP address
  34  *
  35  * Check whether it is possible to bind & connect to ports
  36  * on the DNS name or IP address @hostname. If an IP address
  37  * is used, it must not be a wildcard address.
  38  *
  39  * Returns 0 on success, -1 on error with errno set
  40  */
  41 static int socket_can_bind_connect(const char *hostname, int family)
  42 {
  43     int lfd = -1, cfd = -1, afd = -1;
  44     struct addrinfo ai, *res = NULL;
  45     struct sockaddr_storage ss;
  46     socklen_t sslen = sizeof(ss);
  47     int soerr;
  48     socklen_t soerrlen = sizeof(soerr);
  49     bool check_soerr = false;
  50     int rc;
  51     int ret = -1;
  52
  53     memset(&ai, 0, sizeof(ai));
  54     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
  55     ai.ai_family = family;
  56     ai.ai_socktype = SOCK_STREAM;
  57
  58     /* lookup */
  59     rc = getaddrinfo(hostname, NULL, &ai, &res);
  60     if (rc != 0) {
  61         if (rc == EAI_ADDRFAMILY || rc == EAI_FAMILY || rc == EAI_NONAME) {
  62             errno = EADDRNOTAVAIL;
  63         } else {
  64             errno = EINVAL;
  65         }
  66         goto cleanup;
  67     }
  68
  69     lfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  70     if (lfd < 0) {
  71         goto cleanup;
  72     }
  73
  74     cfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  75     if (cfd < 0) {
  76         goto cleanup;
  77     }
  78
  79     if (bind(lfd, res->ai_addr, res->ai_addrlen) < 0) {
  80         goto cleanup;
  81     }
  82
  83     if (listen(lfd, 1) < 0) {
  84         goto cleanup;
  85     }
  86
  87     if (getsockname(lfd, (struct sockaddr *)&ss, &sslen) < 0) {
  88         goto cleanup;
  89     }
  90
  91     qemu_set_nonblock(cfd);
  92     if (connect(cfd, (struct sockaddr *)&ss, sslen) < 0) {
  93         if (errno == EINPROGRESS) {
  94             check_soerr = true;
  95         } else {
  96             goto cleanup;
  97         }
  98     }
  99
 100     sslen = sizeof(ss);
 101     afd = accept(lfd,  (struct sockaddr *)&ss, &sslen);
 102     if (afd < 0) {
 103         goto cleanup;
 104     }
 105
 106     if (check_soerr) {
 107         if (getsockopt(cfd, SOL_SOCKET, SO_ERROR, &soerr, &soerrlen) < 0) {
 108             goto cleanup;
 109         }
 110         if (soerr) {
 111             errno = soerr;
 112             goto cleanup;
 113         }
 114     }
 115
 116     ret = 0;
 117
 118  cleanup:
 119     if (afd != -1) {
 120         close(afd);
 121     }
 122     if (cfd != -1) {
 123         close(cfd);
 124     }
 125     if (lfd != -1) {
 126         close(lfd);
 127     }
 128     if (res) {
 129         freeaddrinfo(res);
 130     }
 131     return ret;
 132 }
 133
 134
 135 int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
 136 {
 137     *has_ipv4 = *has_ipv6 = false;
 138
 139     if (socket_can_bind_connect("127.0.0.1", PF_INET) < 0) {
 140         if (errno != EADDRNOTAVAIL) {
 141             return -1;
 142         }
 143     } else {
 144         *has_ipv4 = true;
 145     }
 146
 147     if (socket_can_bind_connect("::1", PF_INET6) < 0) {
 148         if (errno != EADDRNOTAVAIL) {
 149             return -1;
 150         }
 151     } else {
 152         *has_ipv6 = true;
 153     }
 154
 155     return 0;
 156 }