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 int socket_can_bind_connect(const char *hostname)
  34 {
  35     int lfd = -1, cfd = -1, afd = -1;
  36     struct addrinfo ai, *res = NULL;
  37     struct sockaddr_storage ss;
  38     socklen_t sslen = sizeof(ss);
  39     int soerr;
  40     socklen_t soerrlen = sizeof(soerr);
  41     bool check_soerr = false;
  42     int rc;
  43     int ret = -1;
  44
  45     memset(&ai, 0, sizeof(ai));
  46     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
  47     ai.ai_family = AF_UNSPEC;
  48     ai.ai_socktype = SOCK_STREAM;
  49
  50     /* lookup */
  51     rc = getaddrinfo(hostname, NULL, &ai, &res);
  52     if (rc != 0) {
  53         if (rc == EAI_ADDRFAMILY ||
  54             rc == EAI_FAMILY) {
  55             errno = EADDRNOTAVAIL;
  56         } else {
  57             errno = EINVAL;
  58         }
  59         goto cleanup;
  60     }
  61
  62     lfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  63     if (lfd < 0) {
  64         goto cleanup;
  65     }
  66
  67     cfd = qemu_socket(res->ai_family, res->ai_socktype, res->ai_protocol);
  68     if (cfd < 0) {
  69         goto cleanup;
  70     }
  71
  72     if (bind(lfd, res->ai_addr, res->ai_addrlen) < 0) {
  73         goto cleanup;
  74     }
  75
  76     if (listen(lfd, 1) < 0) {
  77         goto cleanup;
  78     }
  79
  80     if (getsockname(lfd, (struct sockaddr *)&ss, &sslen) < 0) {
  81         goto cleanup;
  82     }
  83
  84     qemu_set_nonblock(cfd);
  85     if (connect(cfd, (struct sockaddr *)&ss, sslen) < 0) {
  86         if (errno == EINPROGRESS) {
  87             check_soerr = true;
  88         } else {
  89             goto cleanup;
  90         }
  91     }
  92
  93     sslen = sizeof(ss);
  94     afd = accept(lfd,  (struct sockaddr *)&ss, &sslen);
  95     if (afd < 0) {
  96         goto cleanup;
  97     }
  98
  99     if (check_soerr) {
 100         if (qemu_getsockopt(cfd, SOL_SOCKET, SO_ERROR, &soerr, &soerrlen) < 0) {
 101             goto cleanup;
 102         }
 103         if (soerr) {
 104             errno = soerr;
 105             goto cleanup;
 106         }
 107     }
 108
 109     ret = 0;
 110
 111  cleanup:
 112     if (afd != -1) {
 113         close(afd);
 114     }
 115     if (cfd != -1) {
 116         close(cfd);
 117     }
 118     if (lfd != -1) {
 119         close(lfd);
 120     }
 121     if (res) {
 122         freeaddrinfo(res);
 123     }
 124     return ret;
 125 }
 126
 127
 128 int socket_check_protocol_support(bool *has_ipv4, bool *has_ipv6)
 129 {
 130     *has_ipv4 = *has_ipv6 = false;
 131
 132     if (socket_can_bind_connect("127.0.0.1") < 0) {
 133         if (errno != EADDRNOTAVAIL) {
 134             return -1;
 135         }
 136     } else {
 137         *has_ipv4 = true;
 138     }
 139
 140     if (socket_can_bind_connect("::1") < 0) {
 141         if (errno != EADDRNOTAVAIL) {
 142             return -1;
 143         }
 144     } else {
 145         *has_ipv6 = true;
 146     }
 147
 148     return 0;
 149 }