LXR qemu/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
  33int 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
 128int 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}
 150