600 lines
18 KiB
C
600 lines
18 KiB
C
/*
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Copyright (c) 2013, Kenneth MacKay
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY 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 OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ifaddrs.h"
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#include <string.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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typedef struct NetlinkList
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{
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struct NetlinkList *m_next;
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struct nlmsghdr *m_data;
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unsigned int m_size;
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} NetlinkList;
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static int netlink_socket(void)
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{
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int l_socket = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if(l_socket < 0)
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{
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return -1;
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}
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struct sockaddr_nl l_addr;
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memset(&l_addr, 0, sizeof(l_addr));
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l_addr.nl_family = AF_NETLINK;
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if(bind(l_socket, (struct sockaddr *)&l_addr, sizeof(l_addr)) < 0)
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{
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close(l_socket);
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return -1;
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}
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return l_socket;
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}
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static int netlink_send(int p_socket, int p_request)
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{
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char l_buffer[NLMSG_ALIGN(sizeof(struct nlmsghdr)) + NLMSG_ALIGN(sizeof(struct rtgenmsg))];
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memset(l_buffer, 0, sizeof(l_buffer));
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struct nlmsghdr *l_hdr = (struct nlmsghdr *)l_buffer;
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struct rtgenmsg *l_msg = (struct rtgenmsg *)NLMSG_DATA(l_hdr);
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l_hdr->nlmsg_len = NLMSG_LENGTH(sizeof(*l_msg));
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l_hdr->nlmsg_type = p_request;
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l_hdr->nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
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l_hdr->nlmsg_pid = 0;
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l_hdr->nlmsg_seq = p_socket;
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l_msg->rtgen_family = AF_UNSPEC;
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struct sockaddr_nl l_addr;
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memset(&l_addr, 0, sizeof(l_addr));
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l_addr.nl_family = AF_NETLINK;
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return (sendto(p_socket, l_hdr, l_hdr->nlmsg_len, 0, (struct sockaddr *)&l_addr, sizeof(l_addr)));
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}
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static int netlink_recv(int p_socket, void *p_buffer, size_t p_len)
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{
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struct msghdr l_msg;
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struct iovec l_iov = { p_buffer, p_len };
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struct sockaddr_nl l_addr;
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int l_result;
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for(;;)
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{
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l_msg.msg_name = (void *)&l_addr;
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l_msg.msg_namelen = sizeof(l_addr);
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l_msg.msg_iov = &l_iov;
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l_msg.msg_iovlen = 1;
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l_msg.msg_control = NULL;
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l_msg.msg_controllen = 0;
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l_msg.msg_flags = 0;
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int l_result = recvmsg(p_socket, &l_msg, 0);
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if(l_result < 0)
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{
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if(errno == EINTR)
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{
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continue;
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}
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return -2;
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}
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if(l_msg.msg_flags & MSG_TRUNC)
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{ // buffer was too small
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return -1;
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}
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return l_result;
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}
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}
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static struct nlmsghdr *getNetlinkResponse(int p_socket, int *p_size, int *p_done)
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{
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size_t l_size = 4096;
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void *l_buffer = NULL;
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for(;;)
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{
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free(l_buffer);
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l_buffer = malloc(l_size);
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int l_read = netlink_recv(p_socket, l_buffer, l_size);
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*p_size = l_read;
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if(l_read == -2)
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{
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free(l_buffer);
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return NULL;
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}
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if(l_read >= 0)
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{
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pid_t l_pid = getpid();
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struct nlmsghdr *l_hdr;
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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))
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{
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if((pid_t)l_hdr->nlmsg_pid != l_pid || (int)l_hdr->nlmsg_seq != p_socket)
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{
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continue;
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}
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if(l_hdr->nlmsg_type == NLMSG_DONE)
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{
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*p_done = 1;
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break;
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}
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if(l_hdr->nlmsg_type == NLMSG_ERROR)
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{
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free(l_buffer);
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return NULL;
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}
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}
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return l_buffer;
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}
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l_size *= 2;
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}
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}
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static NetlinkList *newListItem(struct nlmsghdr *p_data, unsigned int p_size)
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{
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NetlinkList *l_item = malloc(sizeof(NetlinkList));
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l_item->m_next = NULL;
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l_item->m_data = p_data;
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l_item->m_size = p_size;
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return l_item;
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}
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static void freeResultList(NetlinkList *p_list)
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{
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NetlinkList *l_cur;
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while(p_list)
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{
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l_cur = p_list;
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p_list = p_list->m_next;
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free(l_cur->m_data);
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free(l_cur);
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}
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}
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static NetlinkList *getResultList(int p_socket, int p_request)
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{
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if(netlink_send(p_socket, p_request) < 0)
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{
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return NULL;
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}
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NetlinkList *l_list = NULL;
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NetlinkList *l_end = NULL;
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int l_size;
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int l_done = 0;
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while(!l_done)
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{
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struct nlmsghdr *l_hdr = getNetlinkResponse(p_socket, &l_size, &l_done);
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if(!l_hdr)
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{ // error
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freeResultList(l_list);
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return NULL;
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}
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NetlinkList *l_item = newListItem(l_hdr, l_size);
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if(!l_list)
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{
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l_list = l_item;
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}
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else
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{
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l_end->m_next = l_item;
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}
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l_end = l_item;
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}
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return l_list;
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}
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static size_t maxSize(size_t a, size_t b)
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{
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return (a > b ? a : b);
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}
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static size_t calcAddrLen(sa_family_t p_family, int p_dataSize)
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{
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switch(p_family)
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{
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case AF_INET:
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return sizeof(struct sockaddr_in);
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case AF_INET6:
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return sizeof(struct sockaddr_in6);
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case AF_PACKET:
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return maxSize(sizeof(struct sockaddr_ll), offsetof(struct sockaddr_ll, sll_addr) + p_dataSize);
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default:
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return maxSize(sizeof(struct sockaddr), offsetof(struct sockaddr, sa_data) + p_dataSize);
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}
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}
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static void makeSockaddr(sa_family_t p_family, struct sockaddr *p_dest, void *p_data, size_t p_size)
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{
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switch(p_family)
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{
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case AF_INET:
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memcpy(&((struct sockaddr_in*)p_dest)->sin_addr, p_data, p_size);
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break;
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case AF_INET6:
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memcpy(&((struct sockaddr_in6*)p_dest)->sin6_addr, p_data, p_size);
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break;
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case AF_PACKET:
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memcpy(((struct sockaddr_ll*)p_dest)->sll_addr, p_data, p_size);
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((struct sockaddr_ll*)p_dest)->sll_halen = p_size;
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break;
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default:
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memcpy(p_dest->sa_data, p_data, p_size);
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break;
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}
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p_dest->sa_family = p_family;
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}
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static void addToEnd(struct ifaddrs **p_resultList, struct ifaddrs *p_entry)
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{
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if(!*p_resultList)
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{
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*p_resultList = p_entry;
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}
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else
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{
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struct ifaddrs *l_cur = *p_resultList;
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while(l_cur->ifa_next)
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{
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l_cur = l_cur->ifa_next;
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}
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l_cur->ifa_next = p_entry;
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}
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}
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static void interpretLink(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
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{
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struct ifinfomsg *l_info = (struct ifinfomsg *)NLMSG_DATA(p_hdr);
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size_t l_nameSize = 0;
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size_t l_addrSize = 0;
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size_t l_dataSize = 0;
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size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
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struct rtattr *l_rta;
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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))
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{
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void *l_rtaData = RTA_DATA(l_rta);
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size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
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switch(l_rta->rta_type)
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{
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case IFLA_ADDRESS:
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case IFLA_BROADCAST:
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l_addrSize += NLMSG_ALIGN(calcAddrLen(AF_PACKET, l_rtaDataSize));
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break;
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case IFLA_IFNAME:
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l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
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break;
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case IFLA_STATS:
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l_dataSize += NLMSG_ALIGN(l_rtaSize);
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break;
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default:
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break;
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}
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}
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struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize + l_dataSize);
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memset(l_entry, 0, sizeof(struct ifaddrs));
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l_entry->ifa_name = "";
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char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
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char *l_addr = l_name + l_nameSize;
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char *l_data = l_addr + l_addrSize;
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l_entry->ifa_flags = l_info->ifi_flags;
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l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifinfomsg));
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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))
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{
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void *l_rtaData = RTA_DATA(l_rta);
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size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
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switch(l_rta->rta_type)
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{
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case IFLA_ADDRESS:
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case IFLA_BROADCAST:
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{
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size_t l_addrLen = calcAddrLen(AF_PACKET, l_rtaDataSize);
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makeSockaddr(AF_PACKET, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
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((struct sockaddr_ll *)l_addr)->sll_ifindex = l_info->ifi_index;
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((struct sockaddr_ll *)l_addr)->sll_hatype = l_info->ifi_type;
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if(l_rta->rta_type == IFLA_ADDRESS)
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{
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l_entry->ifa_addr = (struct sockaddr *)l_addr;
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}
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else
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{
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l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
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}
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l_addr += NLMSG_ALIGN(l_addrLen);
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break;
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}
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case IFLA_IFNAME:
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strncpy(l_name, l_rtaData, l_rtaDataSize);
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l_name[l_rtaDataSize] = '\0';
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l_entry->ifa_name = l_name;
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break;
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case IFLA_STATS:
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memcpy(l_data, l_rtaData, l_rtaDataSize);
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l_entry->ifa_data = l_data;
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break;
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default:
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break;
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}
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}
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addToEnd(p_resultList, l_entry);
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p_links[l_info->ifi_index - 1] = l_entry;
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}
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static void interpretAddr(struct nlmsghdr *p_hdr, struct ifaddrs **p_links, struct ifaddrs **p_resultList)
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{
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struct ifaddrmsg *l_info = (struct ifaddrmsg *)NLMSG_DATA(p_hdr);
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size_t l_nameSize = 0;
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size_t l_addrSize = 0;
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int l_addedNetmask = 0;
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size_t l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
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struct rtattr *l_rta;
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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))
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{
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void *l_rtaData = RTA_DATA(l_rta);
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size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
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if(l_info->ifa_family == AF_PACKET)
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{
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continue;
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}
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switch(l_rta->rta_type)
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{
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case IFA_ADDRESS:
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case IFA_LOCAL:
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if((l_info->ifa_family == AF_INET || l_info->ifa_family == AF_INET6) && !l_addedNetmask)
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{ // make room for netmask
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l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
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l_addedNetmask = 1;
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}
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case IFA_BROADCAST:
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l_addrSize += NLMSG_ALIGN(calcAddrLen(l_info->ifa_family, l_rtaDataSize));
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break;
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case IFA_LABEL:
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l_nameSize += NLMSG_ALIGN(l_rtaSize + 1);
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break;
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default:
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break;
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}
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}
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struct ifaddrs *l_entry = malloc(sizeof(struct ifaddrs) + l_nameSize + l_addrSize);
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memset(l_entry, 0, sizeof(struct ifaddrs));
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l_entry->ifa_name = p_links[l_info->ifa_index - 1]->ifa_name;
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char *l_name = ((char *)l_entry) + sizeof(struct ifaddrs);
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char *l_addr = l_name + l_nameSize;
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l_entry->ifa_flags = l_info->ifa_flags | p_links[l_info->ifa_index - 1]->ifa_flags;
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l_rtaSize = NLMSG_PAYLOAD(p_hdr, sizeof(struct ifaddrmsg));
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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))
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{
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void *l_rtaData = RTA_DATA(l_rta);
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size_t l_rtaDataSize = RTA_PAYLOAD(l_rta);
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switch(l_rta->rta_type)
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{
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case IFA_ADDRESS:
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case IFA_BROADCAST:
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case IFA_LOCAL:
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{
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size_t l_addrLen = calcAddrLen(l_info->ifa_family, l_rtaDataSize);
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makeSockaddr(l_info->ifa_family, (struct sockaddr *)l_addr, l_rtaData, l_rtaDataSize);
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if(l_info->ifa_family == AF_INET6)
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{
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if(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)l_rtaData) || IN6_IS_ADDR_MC_LINKLOCAL((struct in6_addr *)l_rtaData))
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{
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((struct sockaddr_in6 *)l_addr)->sin6_scope_id = l_info->ifa_index;
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}
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}
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if(l_rta->rta_type == IFA_ADDRESS)
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{ // apparently in a point-to-point network IFA_ADDRESS contains the dest address and IFA_LOCAL contains the local address
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if(l_entry->ifa_addr)
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{
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l_entry->ifa_dstaddr = (struct sockaddr *)l_addr;
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}
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else
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{
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l_entry->ifa_addr = (struct sockaddr *)l_addr;
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}
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}
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else if(l_rta->rta_type == IFA_LOCAL)
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{
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if(l_entry->ifa_addr)
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{
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l_entry->ifa_dstaddr = l_entry->ifa_addr;
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}
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l_entry->ifa_addr = (struct sockaddr *)l_addr;
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}
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else
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{
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l_entry->ifa_broadaddr = (struct sockaddr *)l_addr;
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}
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l_addr += NLMSG_ALIGN(l_addrLen);
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break;
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}
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case IFA_LABEL:
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strncpy(l_name, l_rtaData, l_rtaDataSize);
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l_name[l_rtaDataSize] = '\0';
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l_entry->ifa_name = l_name;
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break;
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default:
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break;
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}
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}
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if(l_entry->ifa_addr && (l_entry->ifa_addr->sa_family == AF_INET || l_entry->ifa_addr->sa_family == AF_INET6))
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{
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unsigned l_maxPrefix = (l_entry->ifa_addr->sa_family == AF_INET ? 32 : 128);
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unsigned l_prefix = (l_info->ifa_prefixlen > l_maxPrefix ? l_maxPrefix : l_info->ifa_prefixlen);
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char l_mask[16] = {0};
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unsigned i;
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for(i=0; i<(l_prefix/8); ++i)
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{
|
|
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);
|
|
}
|
|
} |