mirror of
https://github.com/Silicondust/libhdhomerun
synced 2025-07-05 12:36:48 -07:00
136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
|
|
* hdhomerun_sock_getifaddrs.c
|
|
*
|
|
* Copyright © 2010-2022 Silicondust USA Inc. <www.silicondust.com>.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "hdhomerun.h"
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <net/if.h>
|
|
|
|
static uint8_t hdhomerun_local_ip_netmask_to_cidr(uint8_t *subnet_mask, size_t len)
|
|
{
|
|
uint8_t result = 0;
|
|
|
|
uint8_t *ptr = subnet_mask;
|
|
uint8_t *end = subnet_mask + len;
|
|
while (ptr < end) {
|
|
uint8_t c = *ptr++;
|
|
if (c == 0xFF) {
|
|
result += 8;
|
|
continue;
|
|
}
|
|
|
|
while (c & 0x80) {
|
|
result++;
|
|
c <<= 1;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
bool hdhomerun_local_ip_info2(int af, hdhomerun_local_ip_info2_callback_t callback, void *callback_arg)
|
|
{
|
|
if (af != AF_INET) {
|
|
return false;
|
|
}
|
|
|
|
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
|
|
if (sock == -1) {
|
|
return false;
|
|
}
|
|
|
|
int ifreq_buffer_size = 128 * sizeof(struct ifreq);
|
|
char *ifreq_buffer = (char *)calloc(1, ifreq_buffer_size);
|
|
if (!ifreq_buffer) {
|
|
close(sock);
|
|
return false;
|
|
}
|
|
|
|
struct ifconf ifc;
|
|
ifc.ifc_len = ifreq_buffer_size;
|
|
ifc.ifc_buf = ifreq_buffer;
|
|
|
|
if (ioctl(sock, SIOCGIFCONF, &ifc) != 0) {
|
|
free(ifreq_buffer);
|
|
close(sock);
|
|
return false;
|
|
}
|
|
|
|
if (ifc.ifc_len > ifreq_buffer_size) {
|
|
ifc.ifc_len = ifreq_buffer_size;
|
|
}
|
|
|
|
char *ptr = ifc.ifc_buf;
|
|
char *end = ifc.ifc_buf + ifc.ifc_len;
|
|
|
|
while (ptr + sizeof(struct ifreq) <= end) {
|
|
struct ifreq *ifr = (struct ifreq *)ptr;
|
|
ptr += sizeof(struct ifreq);
|
|
|
|
/* Local IP address. */
|
|
struct sockaddr_in ip_addr_in;
|
|
memcpy(&ip_addr_in, &ifr->ifr_addr, sizeof(ip_addr_in));
|
|
if (!hdhomerun_sock_sockaddr_is_addr((const struct sockaddr *)&ip_addr_in)) {
|
|
continue;
|
|
}
|
|
|
|
/* Flags. */
|
|
if (ioctl(sock, SIOCGIFFLAGS, ifr) != 0) {
|
|
continue;
|
|
}
|
|
|
|
if ((ifr->ifr_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) {
|
|
continue;
|
|
}
|
|
if ((ifr->ifr_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) {
|
|
continue;
|
|
}
|
|
|
|
/* Subnet mask. */
|
|
if (ioctl(sock, SIOCGIFNETMASK, ifr) != 0) {
|
|
continue;
|
|
}
|
|
|
|
struct sockaddr_in *netmask_in = (struct sockaddr_in *)&ifr->ifr_addr;
|
|
uint8_t cidr = hdhomerun_local_ip_netmask_to_cidr((uint8_t *)&netmask_in->sin_addr.s_addr, 4);
|
|
if ((cidr == 0) || (cidr >= 32)) {
|
|
continue;
|
|
}
|
|
|
|
/* ifindex. */
|
|
if (ioctl(sock, SIOCGIFINDEX, ifr) != 0) {
|
|
continue;
|
|
}
|
|
|
|
uint32_t ifindex = ifr->ifr_ifindex;
|
|
if (ifindex == 0) {
|
|
continue;
|
|
}
|
|
|
|
/* Result. */
|
|
callback(callback_arg, ifindex, (const struct sockaddr *)&ip_addr_in, cidr);
|
|
}
|
|
|
|
free(ifreq_buffer);
|
|
close(sock);
|
|
return true;
|
|
}
|