tests/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-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  */
  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
 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 }