110 lines
3.2 KiB
C
110 lines
3.2 KiB
C
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/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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static int
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get_addr_str(struct sockaddr *sa, char *host, size_t hlen)
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{
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const char *result = NULL;
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if (sa == NULL || host == NULL) {
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return -1;
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}
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switch (sa->sa_family) {
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case AF_INET:
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result = inet_ntop(AF_INET, &(((struct sockaddr_in *)sa)->sin_addr),
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host, hlen);
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break;
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case AF_INET6:
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result = inet_ntop(AF_INET6, &(((struct sockaddr_in6 *)sa)->sin6_addr),
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host, hlen);
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break;
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default:
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break;
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}
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if (result != NULL) {
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return 0;
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} else {
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return -1;
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}
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}
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static bool
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sock_is_loopback(int fd)
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{
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struct ifaddrs *addrs, *tmp;
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struct sockaddr_storage sa = {};
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socklen_t salen;
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struct ifreq ifr = {};
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char ip_addr[256], ip_addr_tmp[256];
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int rc;
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bool is_loopback = false;
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salen = sizeof(sa);
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rc = getsockname(fd, (struct sockaddr *)&sa, &salen);
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if (rc != 0) {
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return is_loopback;
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}
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memset(ip_addr, 0, sizeof(ip_addr));
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rc = get_addr_str((struct sockaddr *)&sa, ip_addr, sizeof(ip_addr));
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if (rc != 0) {
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return is_loopback;
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}
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getifaddrs(&addrs);
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for (tmp = addrs; tmp != NULL; tmp = tmp->ifa_next) {
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if (tmp->ifa_addr && (tmp->ifa_flags & IFF_UP) &&
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(tmp->ifa_addr->sa_family == sa.ss_family)) {
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memset(ip_addr_tmp, 0, sizeof(ip_addr_tmp));
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rc = get_addr_str(tmp->ifa_addr, ip_addr_tmp, sizeof(ip_addr_tmp));
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if (rc != 0) {
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continue;
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}
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if (strncmp(ip_addr, ip_addr_tmp, sizeof(ip_addr)) == 0) {
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memcpy(ifr.ifr_name, tmp->ifa_name, sizeof(ifr.ifr_name));
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ioctl(fd, SIOCGIFFLAGS, &ifr);
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if (ifr.ifr_flags & IFF_LOOPBACK) {
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is_loopback = true;
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}
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goto end;
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}
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}
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}
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end:
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freeifaddrs(addrs);
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return is_loopback;
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}
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