+++ /dev/null
-/*
-Copyright (c) 2013, Kenneth MacKay
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without modification,
-are permitted provided that the following conditions are met:
- * Redistributions of source code must retain the above copyright notice, this
- list of conditions and the following disclaimer.
- * Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation
- and/or other materials provided with the distribution.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
-ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
-ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-*/
-
-#include <net/if.h>
-#include "ifaddrs.h"
-
-#include <string.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <errno.h>
-#include <unistd.h>
-#include <sys/socket.h>
-#include <netpacket/packet.h>
-#include <net/if_arp.h>
-#include <netinet/in.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-#include <sys/ioctl.h>
-
-typedef struct NetlinkList
-{
- struct NetlinkList *m_next;
- struct nlmsghdr *m_data;
- unsigned int m_size;
-} NetlinkList;
-
-static int netlink_socket(void)
-{
- int l_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
- if(l_socket < 0)
- {
- return -1;
- }
-
- struct sockaddr_nl l_addr;
- memset(&l_addr, 0, sizeof(l_addr));
- l_addr.nl_family = AF_NETLINK;
- if(bind(l_socket, (struct sockaddr *)&l_addr, sizeof(l_addr)) < 0)
- {
- close(l_socket);
- return -1;
- }
-
- return l_socket;
-}
-
-static int netlink_send(int p_socket, int p_request)
-{
- struct
- {
- struct nlmsghdr m_hdr;
- struct rtgenmsg m_msg;
- } l_data;
-
- memset(&l_data, 0, sizeof(l_data));
-
- l_data.m_hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
- l_data.m_hdr.nlmsg_type = p_request;
- l_data.m_hdr.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
- l_data.m_hdr.nlmsg_pid = 0;
- l_data.m_hdr.nlmsg_seq = p_socket;
- l_data.m_msg.rtgen_family = AF_UNSPEC;
-
- struct sockaddr_nl l_addr;
- memset(&l_addr, 0, sizeof(l_addr));
- l_addr.nl_family = AF_NETLINK;
- return (sendto(p_socket, &l_data.m_hdr, l_data.m_hdr.nlmsg_len, 0, (struct sockaddr *)&l_addr, sizeof(l_addr)));
-}
-
-static int netlink_recv(int p_socket, void *p_buffer, size_t p_len)
-{
- struct msghdr l_msg;
- struct iovec l_iov = { p_buffer, p_len };
- struct sockaddr_nl l_addr;
-
- for(;;)
- {
- l_msg.msg_name = (void *)&l_addr;
- l_msg.msg_namelen = sizeof(l_addr);
- l_msg.msg_iov = &l_iov;
- l_msg.msg_iovlen = 1;
- l_msg.msg_control = NULL;
- l_msg.msg_controllen = 0;
- l_msg.msg_flags = 0;
- int l_result = recvmsg(p_socket, &l_msg, 0);
-
- if(l_result < 0)
- {
- if(errno == EINTR)
- {
- continue;
- }
- return -2;
- }
-
- if(l_msg.msg_flags & MSG_TRUNC)
- { // buffer was too small
- return -1;
- }
- return l_result;
- }
-}
-
-static struct nlmsghdr *getNetlinkResponse(int p_socket, int *p_size, int *p_done)
-{
- size_t l_size = 4096;
- void *l_buffer = NULL;
-
- for(;;)
- {
- free(l_buffer);
- l_buffer = malloc(l_size);
- if (l_buffer == NULL)
- {
- return NULL;
- }
-
- int l_read = netlink_recv(p_socket, l_buffer, l_size);
- *p_size = l_read;
- if(l_read == -2)
- {
- free(l_buffer);
- return NULL;
- }
- if(l_read >= 0)
- {
- pid_t l_pid = getpid();
- struct nlmsghdr *l_hdr;
- for(l_hdr = (struct nlmsghdr *)l_buffer; NLMSG_OK(l_hdr, (unsigned int)l_read); l_hdr = (struct nlmsghdr *)NLMSG_NEXT(l_hdr, l_read))
- {
- if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
- {
- continue;
- }
-
- if(l_hdr->nlmsg_type == NLMSG_DONE)
- {
- *p_done = 1;
- break;
- }
-
- if(l_hdr->nlmsg_type == NLMSG_ERROR)
- {
- free(l_buffer);
- return NULL;
- }
- }
- return l_buffer;
- }
-
- l_size *= 2;
- }
-}
-
-static NetlinkList *newListItem(struct nlmsghdr *p_data, unsigned int p_size)
-{
- NetlinkList *l_item = malloc(sizeof(NetlinkList));
- if (l_item == NULL)
- {
- return NULL;
- }
-
- l_item->m_next = NULL;
- l_item->m_data = p_data;
- l_item->m_size = p_size;
- return l_item;
-}
-
-static void freeResultList(NetlinkList *p_list)
-{
- NetlinkList *l_cur;
- while(p_list)
- {
- l_cur = p_list;
- p_list = p_list->m_next;
- free(l_cur->m_data);
- free(l_cur);
- }
-}
-
-static NetlinkList *getResultList(int p_socket, int p_request)
-{
- if(netlink_send(p_socket, p_request) < 0)
- {
- return NULL;
- }
-
- NetlinkList *l_list = NULL;
- NetlinkList *l_end = NULL;
- int l_size;
- int l_done = 0;
- while(!l_done)
- {
- struct nlmsghdr *l_hdr = getNetlinkResponse(p_socket, &l_size, &l_done);
- if(!l_hdr)
- { // error
- freeResultList(l_list);
- return NULL;
- }
-
- NetlinkList *l_item = newListItem(l_hdr, l_size);
- if (!l_item)
- {
- freeResultList(l_list);
- return NULL;
- }
- if(!l_list)
- {
- l_list = l_item;
- }
- else
- {
- l_end->m_next = l_item;
- }
- l_end = l_item;
- }
- return l_list;
-}
-
-static size_t maxSize(size_t a, size_t b)
-{
- return (a > b ? a : b);
-}
-
-static size_t calcAddrLen(sa_family_t p_family, int p_dataSize)
-{
- switch(p_family)
- {
- case AF_INET:
- return sizeof(struct sockaddr_in);
- case AF_INET6:
- return sizeof(struct sockaddr_in6);
- case AF_PACKET:
- return maxSize(sizeof(struct sockaddr_ll), offsetof(struct sockaddr_ll, sll_addr) + p_dataSize);
- default:
- return maxSize(sizeof(struct sockaddr), offsetof(struct sockaddr, sa_data) + p_dataSize);
- }
-}
-
-static void makeSockaddr(sa_family_t p_family, struct sockaddr *p_dest, void *p_data, size_t p_size)
-{
- switch(p_family)
- {
- case AF_INET:
- memcpy(&((struct sockaddr_in*)p_dest)->sin_addr, p_data, p_size);
- break;
- case AF_INET6:
- memcpy(&((struct sockaddr_in6*)p_dest)->sin6_addr, p_data, p_size);
- break;
- case AF_PACKET:
- memcpy(((struct sockaddr_ll*)p_dest)->sll_addr, p_data, p_size);
- ((struct sockaddr_ll*)p_dest)->sll_halen = p_size;
- break;
- default:
- memcpy(p_dest->sa_data, p_data, p_size);
- break;
- }
- p_dest->sa_family = p_family;
-}
-
-static void addToEnd(struct ifaddrs **p_resultList, struct ifaddrs *p_entry)
-{
- if(!*p_resultList)
- {
- *p_resultList = p_entry;
- }
- else
- {
- struct ifaddrs *l_cur = *p_resultList;
- while(l_cur->ifa_next)
- {
- l_cur = l_cur->ifa_next;
- }
- l_cur->ifa_next = p_entry;
- }
-}
-
-static int interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList)
-{
- struct ifinfomsg *l_info = (struct ifinfomsg *)NLMSG_DATA(p_hdr);
-
- size_t l_nameSize = 0;
- size_t l_addrSize = 0;
- size_t l_dataSize = 0;
-
- size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
- struct rtattr *l_rta;
- for(l_rta = IFLA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
- {
- //void *l_rtaData = RTA_DATA(l_rta);
- size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
- switch(l_rta->rta_type)
- {
- case IFLA_ADDRESS:
- case IFLA_BROADCAST:
- l_addrSize += NLMSG_ALIGN(calcAddrLen(AF_PACKET, l_rtaDataSize));
- break;
- case IFLA_IFNAME:
- l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
- break;
- case IFLA_STATS:
- l_dataSize += NLMSG_ALIGN(l_rtaSize);
- break;
- default:
- break;
- }
- }
-
- struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + sizeof(int) + l_nameSize + l_addrSize + l_dataSize);
- if (l_entry == NULL)
- {
- return -1;
- }
- memset(l_entry, 0, sizeof(struct ifaddrs));
- l_entry->ifa_name = "";
-
- char *l_index = ((char *)l_entry) + sizeof(struct ifaddrs);
- char *l_name = l_index + sizeof(int);
- char *l_addr = l_name + l_nameSize;
- char *l_data = l_addr + l_addrSize;
-
- // save the interface index so we can look it up when handling the addresses.
- memcpy(l_index, &l_info->ifi_index, sizeof(int));
-
- l_entry->ifa_flags = l_info->ifi_flags;
-
- l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
- for(l_rta = IFLA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
- {
- void *l_rtaData = RTA_DATA(l_rta);
- size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
- switch(l_rta->rta_type)
- {
- case IFLA_ADDRESS:
- case IFLA_BROADCAST:
- {
- size_t l_addrLen = calcAddrLen(AF_PACKET, l_rtaDataSize);
- makeSockaddr(AF_PACKET, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
- ((struct sockaddr_ll *)l_addr)->sll_ifindex = l_info->ifi_index;
- ((struct sockaddr_ll *)l_addr)->sll_hatype = l_info->ifi_type;
- if(l_rta->rta_type == IFLA_ADDRESS)
- {
- l_entry->ifa_addr = (struct sockaddr *)l_addr;
- }
- else
- {
- l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
- }
- l_addr += NLMSG_ALIGN(l_addrLen);
- break;
- }
- case IFLA_IFNAME:
- strncpy(l_name, l_rtaData, l_rtaDataSize);
- l_name[l_rtaDataSize] = '\0';
- l_entry->ifa_name = l_name;
- break;
- case IFLA_STATS:
- memcpy(l_data, l_rtaData, l_rtaDataSize);
- l_entry->ifa_data = l_data;
- break;
- default:
- break;
- }
- }
-
- addToEnd(p_resultList, l_entry);
- return 0;
-}
-
-static struct ifaddrs *findInterface(int p_index, struct ifaddrs **p_links, int p_numLinks)
-{
- int l_num = 0;
- struct ifaddrs *l_cur = *p_links;
- while(l_cur && l_num < p_numLinks)
- {
- char *l_indexPtr = ((char *)l_cur) + sizeof(struct ifaddrs);
- int l_index;
- memcpy(&l_index, l_indexPtr, sizeof(int));
- if(l_index == p_index)
- {
- return l_cur;
- }
-
- l_cur = l_cur->ifa_next;
- ++l_num;
- }
- return NULL;
-}
-
-static int interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_resultList, int p_numLinks)
-{
- struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
- struct ifaddrs *l_interface = findInterface(l_info->ifa_index, p_resultList, p_numLinks);
-
- if(l_info->ifa_family == AF_PACKET)
- {
- return 0;
- }
-
- size_t l_nameSize = 0;
- size_t l_addrSize = 0;
-
- int l_addedNetmask = 0;
-
- size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
- struct rtattr *l_rta;
- for(l_rta = IFA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
- {
- //void *l_rtaData = RTA_DATA(l_rta);
- size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
-
- switch(l_rta->rta_type)
- {
- case IFA_ADDRESS:
- case IFA_LOCAL:
- if((l_info->ifa_family == AF_INET || l_info->ifa_family == AF_INET6) && !l_addedNetmask)
- { // make room for netmask
- l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
- l_addedNetmask = 1;
- }
- case IFA_BROADCAST:
- l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
- break;
- case IFA_LABEL:
- l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
- break;
- default:
- break;
- }
- }
-
- struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize);
- if (l_entry == NULL)
- {
- return -1;
- }
- memset(l_entry, 0, sizeof(struct ifaddrs));
- l_entry->ifa_name = (l_interface ? l_interface->ifa_name : "");
-
- char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
- char *l_addr = l_name + l_nameSize;
-
- l_entry->ifa_flags = l_info->ifa_flags;
- if(l_interface)
- {
- l_entry->ifa_flags |= l_interface->ifa_flags;
- }
-
- l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
- for(l_rta = IFA_RTA(l_info); RTA_OK(l_rta, l_rtaSize); l_rta = RTA_NEXT(l_rta, l_rtaSize))
- {
- void *l_rtaData = RTA_DATA(l_rta);
- size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
- switch(l_rta->rta_type)
- {
- case IFA_ADDRESS:
- case IFA_BROADCAST:
- case IFA_LOCAL:
- {
- size_t l_addrLen = calcAddrLen(l_info->ifa_family, l_rtaDataSize);
- makeSockaddr(l_info->ifa_family, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
- if(l_info->ifa_family == AF_INET6)
- {
- if(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)l_rtaData) || IN6_IS_ADDR_MC_LINKLOCAL((struct in6_addr *)l_rtaData))
- {
- ((struct sockaddr_in6 *)l_addr)->sin6_scope_id = l_info->ifa_index;
- }
- }
-
- if(l_rta->rta_type == IFA_ADDRESS)
- { // apparently in a point-to-point network IFA_ADDRESS contains the dest address and IFA_LOCAL contains the local address
- if(l_entry->ifa_addr)
- {
- l_entry->ifa_dstaddr = (struct sockaddr *)l_addr;
- }
- else
- {
- l_entry->ifa_addr = (struct sockaddr *)l_addr;
- }
- }
- else if(l_rta->rta_type == IFA_LOCAL)
- {
- if(l_entry->ifa_addr)
- {
- l_entry->ifa_dstaddr = l_entry->ifa_addr;
- }
- l_entry->ifa_addr = (struct sockaddr *)l_addr;
- }
- else
- {
- l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
- }
- l_addr += NLMSG_ALIGN(l_addrLen);
- break;
- }
- case IFA_LABEL:
- strncpy(l_name, l_rtaData, l_rtaDataSize);
- l_name[l_rtaDataSize] = '\0';
- l_entry->ifa_name = l_name;
- break;
- default:
- break;
- }
- }
-
- if(l_entry->ifa_addr && (l_entry->ifa_addr->sa_family == AF_INET || l_entry->ifa_addr->sa_family == AF_INET6))
- {
- unsigned l_maxPrefix = (l_entry->ifa_addr->sa_family == AF_INET ? 32 : 128);
- unsigned l_prefix = (l_info->ifa_prefixlen > l_maxPrefix ? l_maxPrefix : l_info->ifa_prefixlen);
- char l_mask[16] = {0};
- unsigned i;
- for(i=0; i<(l_prefix/8); ++i)
- {
- l_mask[i] = 0xff;
- }
- if(l_prefix % 8)
- {
- l_mask[i] = 0xff << (8 - (l_prefix % 8));
- }
-
- makeSockaddr(l_entry->ifa_addr->sa_family, (struct sockaddr *)l_addr, l_mask, l_maxPrefix / 8);
- l_entry->ifa_netmask = (struct sockaddr *)l_addr;
- }
-
- addToEnd(p_resultList, l_entry);
- return 0;
-}
-
-static int interpretLinks(int p_socket, NetlinkList *p_netlinkList, struct ifaddrs **p_resultList)
-{
- int l_numLinks = 0;
- pid_t l_pid = getpid();
- for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
- {
- unsigned int l_nlsize = p_netlinkList->m_size;
- struct nlmsghdr *l_hdr;
- for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
- {
- if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
- {
- continue;
- }
-
- if(l_hdr->nlmsg_type == NLMSG_DONE)
- {
- break;
- }
-
- if(l_hdr->nlmsg_type == RTM_NEWLINK)
- {
- if(interpretLink(l_hdr, p_resultList) == -1)
- {
- return -1;
- }
- ++l_numLinks;
- }
- }
- }
- return l_numLinks;
-}
-
-static int interpretAddrs(int p_socket, NetlinkList *p_netlinkList, struct ifaddrs **p_resultList, int p_numLinks)
-{
- pid_t l_pid = getpid();
- for(; p_netlinkList; p_netlinkList = p_netlinkList->m_next)
- {
- unsigned int l_nlsize = p_netlinkList->m_size;
- struct nlmsghdr *l_hdr;
- for(l_hdr = p_netlinkList->m_data; NLMSG_OK(l_hdr, l_nlsize); l_hdr = NLMSG_NEXT(l_hdr, l_nlsize))
- {
- if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
- {
- continue;
- }
-
- if(l_hdr->nlmsg_type == NLMSG_DONE)
- {
- break;
- }
-
- if(l_hdr->nlmsg_type == RTM_NEWADDR)
- {
- if (interpretAddr(l_hdr, p_resultList, p_numLinks) == -1)
- {
- return -1;
- }
- }
- }
- }
- return 0;
-}
-
-int getifaddrs(struct ifaddrs **ifap)
-{
- if(!ifap)
- {
- return -1;
- }
- *ifap = NULL;
-
- int l_socket = netlink_socket();
- if(l_socket < 0)
- {
- return -1;
- }
-
- NetlinkList *l_linkResults = getResultList(l_socket, RTM_GETLINK);
- if(!l_linkResults)
- {
- close(l_socket);
- return -1;
- }
-
- NetlinkList *l_addrResults = getResultList(l_socket, RTM_GETADDR);
- if(!l_addrResults)
- {
- close(l_socket);
- freeResultList(l_linkResults);
- return -1;
- }
-
- int l_result = 0;
- int l_numLinks = interpretLinks(l_socket, l_linkResults, ifap);
- if(l_numLinks == -1 || interpretAddrs(l_socket, l_addrResults, ifap, l_numLinks) == -1)
- {
- l_result = -1;
- }
-
- freeResultList(l_linkResults);
- freeResultList(l_addrResults);
- close(l_socket);
- return l_result;
-}
-
-void freeifaddrs(struct ifaddrs *ifa)
-{
- struct ifaddrs *l_cur;
- while(ifa)
- {
- l_cur = ifa;
- ifa = ifa->ifa_next;
- free(l_cur);
- }
-}
-
-
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-//#include <string.h>
-//#include <unistd.h>
-//#include <linux/sockios.h>
-//#include <net/if.h>
-//#include <sys/socket.h>
-//#include <sys/ioctl.h>
-
-/*
- * Map an interface name into its corresponding index.
- * Returns 0 on error, as 0 is not a valid index.
- */
-unsigned int if_nametoindex(const char *ifname)
-{
- int index;
- int ctl_sock;
- struct ifreq ifr;
-
- memset(&ifr, 0, sizeof(struct ifreq));
- strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
- ifr.ifr_name[IFNAMSIZ - 1] = 0;
-
- index = 0;
- if ((ctl_sock = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) {
- if (ioctl(ctl_sock, SIOCGIFINDEX, &ifr) >= 0) {
- index = ifr.ifr_ifindex;
- }
- close(ctl_sock);
- }
- return index;
-}
projects / contrib / iotivity.git / commitdiff