Added the code.

README.md

@@ -1,4 +1,4 @@
 android-ifaddrs
 ===============
 
-An implementation of getifaddrs() for Android.
+An implementation of getifaddrs() for Android, since the NDK does not natively support it. Works just like you would expect on regular Linux. License information is present in each file.

ifaddrs.c

@@ -0,0 +1,600 @@
+/*
+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 "ifaddrs.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/socket.h>
+#include <net/if_arp.h>
+#include <netinet/in.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.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)
+{
+    char l_buffer[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))];
+    memset(l_buffer, 0, sizeof(l_buffer));
+    struct nlmsghdr *l_hdr = (struct nlmsghdr *)l_buffer;
+    struct rtgenmsg *l_msg = (struct rtgenmsg *)NLMSG_DATA(l_hdr);
+    
+    l_hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*l_msg));
+    l_hdr->nlmsg_type = p_request;
+    l_hdr->nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
+    l_hdr->nlmsg_pid = 0;
+    l_hdr->nlmsg_seq = p_socket;
+    l_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_hdr, l_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;
+    int l_result;
+
+    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);
+        
+        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));
+    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_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 void interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, 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 = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); 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) + l_nameSize + l_addrSize + l_dataSize);
+    memset(l_entry, 0, sizeof(struct ifaddrs));
+    l_entry->ifa_name = "";
+    
+    char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
+    char *l_addr = l_name + l_nameSize;
+    char *l_data = l_addr + l_addrSize;
+    
+    l_entry->ifa_flags = l_info->ifi_flags;
+    
+    l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
+    for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifinfomsg))); 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);
+    p_links[l_info->ifi_index - 1] = l_entry;
+}
+
+static void interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
+{
+    struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
+
+    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 = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); 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);
+        if(l_info->ifa_family == AF_PACKET)
+        {
+            continue;
+        }
+        
+        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);
+    memset(l_entry, 0, sizeof(struct ifaddrs));
+    l_entry->ifa_name = p_links[l_info->ifa_index - 1]->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 | p_links[l_info->ifa_index - 1]->ifa_flags;
+    
+    l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
+    for(l_rta = (struct rtattr *)(((char *)l_info) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))); 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;
+        }
+        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);
+}
+
+static void interpret(int p_socket, NetlinkList *p_netlinkList, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
+{
+    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)
+            {
+                interpretLink(l_hdr, p_links, p_resultList);
+            }
+            else if(l_hdr->nlmsg_type == RTM_NEWADDR)
+            {
+                interpretAddr(l_hdr, p_links, p_resultList);
+            }
+        }
+    }
+}
+
+static unsigned countLinks(int p_socket, NetlinkList *p_netlinkList)
+{
+    unsigned l_links = 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)
+            {
+                ++l_links;
+            }
+        }
+    }
+    
+    return l_links;
+}
+
+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;
+    }
+    
+    unsigned l_numLinks = countLinks(l_socket, l_linkResults) + countLinks(l_socket, l_addrResults);
+    struct ifaddrs *l_links[l_numLinks];
+    memset(l_links, 0, l_numLinks * sizeof(struct ifaddrs *));
+    
+    interpret(l_socket, l_linkResults, l_links, ifap);
+    interpret(l_socket, l_addrResults, l_links, ifap);
+
+    freeResultList(l_linkResults);
+    freeResultList(l_addrResults);
+    close(l_socket);
+    return 0;
+}
+
+void freeifaddrs(struct ifaddrs *ifa)
+{
+    struct ifaddrs *l_cur;
+    while(ifa)
+    {
+        l_cur = ifa;
+        ifa = ifa->ifa_next;
+        free(l_cur);
+    }
+}

ifaddrs.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 1995, 1999
+ *	Berkeley Software Design, Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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.
+ *
+ *	BSDI ifaddrs.h,v 2.5 2000/02/23 14:51:59 dab Exp
+ */
+
+#ifndef	_IFADDRS_H_
+#define	_IFADDRS_H_
+
+struct ifaddrs {
+	struct ifaddrs  *ifa_next;
+	char		*ifa_name;
+	unsigned int	 ifa_flags;
+	struct sockaddr	*ifa_addr;
+	struct sockaddr	*ifa_netmask;
+	struct sockaddr	*ifa_dstaddr;
+	void		*ifa_data;
+};
+
+/*
+ * This may have been defined in <net/if.h>.  Note that if <net/if.h> is
+ * to be included it must be included before this header file.
+ */
+#ifndef	ifa_broadaddr
+#define	ifa_broadaddr	ifa_dstaddr	/* broadcast address interface */
+#endif
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+extern int getifaddrs(struct ifaddrs **ifap);
+extern void freeifaddrs(struct ifaddrs *ifa);
+__END_DECLS
+
+#endif