netutils/netlib/netlib_getarptab.c: Add a function to read the entire ARP tableusing NETLINK_ROUTE protocol.
This commit is contained in:
Gregory Nutt
parent
29160741d8
commit
768218ee81
@ -312,6 +312,10 @@ int netlib_get_arpmapping(FAR const struct sockaddr_in *inaddr,
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FAR uint8_t *macaddr);
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int netlib_set_arpmapping(FAR const struct sockaddr_in *inaddr,
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FAR const uint8_t *macaddr);
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#ifdef CONFIG_NETLINK_ROUTE
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struct arp_enty_s;
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int netlib_get_arptable(FAR struct arp_enty_s *arptab, unsigned int nentries);
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#endif
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#endif
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#ifdef HAVE_ROUTE_PROCFS
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@ -84,6 +84,14 @@ CSRCS += netlib_server.c netlib_listenon.c
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endif
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endif
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# These require Netlink support
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ifeq ($(CONFIG_NETLINK_ROUTE),y)
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ifeq ($(CONFIG_NET_ARP),y)
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CSRCS += netlib_getarptab.c
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endif
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endif
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# These require wireless IOCTL support */
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ifeq ($(CONFIG_NETDEV_WIRELESS_IOCTL),y)
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181
netutils/netlib/netlib_getarptab.c
Normal file
181
netutils/netlib/netlib_getarptab.c
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@ -0,0 +1,181 @@
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/****************************************************************************
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* netutils/netlib/netlib_getarptab.c
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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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* 1. 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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* 2. 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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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* 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
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/socket.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <errno.h>
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#include <netpacket/netlink.h>
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#include <nuttx/net/arp.h>
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#include "netutils/netlib.h"
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#if defined(CONFIG_NET_ARP) && defined(CONFIG_NETLINK_ROUTE)
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct netlib_sendto_request_s
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{
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struct nlmsghdr hdr;
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struct ndmsg msg;
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};
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struct netlib_recvfrom_response_s
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{
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struct nlmsghdr hdr;
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struct ndmsg msg;
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struct rtattr attr;
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uint8_t data[1];
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};
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#define SIZEOF_NETLIB_RECVFROM_RESPONSE_S(n) \
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(sizeof(struct netlib_recvfrom_response_s) + (n) - 1)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: netlib_get_arptable
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*
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* Description:
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* Attempt to read the entire ARP table into a buffer.
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*
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* Parameters:
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* arptab - The location to store the copy of the ARP table
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* nentries - The size of the provided arptab in number of entries of
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* size sizeof(struct arp_entry_s)
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*
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* Return:
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* 0 on success; a negated errno value on failure.
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*
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****************************************************************************/
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int netlib_get_arptable(FAR struct arp_enty_s *arptab, unsigned int nentries)
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{
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FAR struct netlib_recvfrom_response_s *resp;
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struct netlib_sendto_request_s req;
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unsigned int allocsize;
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ssize_t nsent;
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ssize_t nrecvd;
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ssize_t paysize;
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ssize_t maxsize;
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int fd;
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int ret = EXIT_FAILURE;
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/* Allocate a buffer to hold the response */
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maxsize = CONFIG_NET_ARPTAB_SIZE * sizeof(struct arp_entry_s);
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allocsize = SIZEOF_NETLIB_RECVFROM_RESPONSE_S(maxsize);
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resp = (FAR struct netlib_recvfrom_response_s *)malloc(allocsize);
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if (resp == NULL)
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{
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fprintf(stderr, "ERROR: Faile to allocat response buffer\n");
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return EXIT_FAILURE;
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}
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/* Create a netlink socket with NETLINK_ROUTE protocol */
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fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
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if (fd < 0)
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{
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int errcode = errno;
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fprintf(stderr, "ERROR: socket() failed: %d\n", errcode);
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goto errout_with_resp;
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}
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/* Initialize the request */
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memset(&req, 0, sizeof(req));
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req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
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req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT | NLM_F_REQUEST;
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req.hdr.nlmsg_type = RTM_GETNEIGH;
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req.msg.ndm_family = AF_INET;
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nsent = send(fd, &req, req.hdr.nlmsg_len, 0);
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if (nsent < 0)
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{
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int errcode = errno;
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fprintf(stderr, "ERROR: send() failed: %d\n", errcode);
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goto errout_with_socket;
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}
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nrecvd = recv(fd, resp, allocsize, 0);
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if (nrecvd < 0)
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{
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int errcode = errno;
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fprintf(stderr, "ERROR: recv() failed: %d\n", errcode);
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goto errout_with_socket;
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}
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/* Verify the data and transfer the ARP table data to the caller */
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if (resp->hdr.nlmsg_len < sizeof(struct nlmsghdr) ||
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resp->hdr.nlmsg_len > nrecvd)
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{
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fprintf(stderr, "ERROR: Bad message\n");
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goto errout_with_socket;
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}
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/* Copy the ARP table data to the caller's buffer */
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paysize = resp->attr.rta_len;
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if (paysize > maxsize)
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{
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paysize = maxsize;
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}
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memcpy(arptab, resp->data, paysize);
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ret = EXIT_SUCCESS;
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errout_with_socket:
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close(fd);
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errout_with_resp:
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free(resp);
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return ret;
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}
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#endif /* CONFIG_NET_ARP && CONFIG_NETLINK_ROUTE */
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