272 lines
8.2 KiB
C
272 lines
8.2 KiB
C
/****************************************************************************
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* netutils/netlib/netlib_getdevs.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 <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.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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#ifdef 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 rtgenmsg gen;
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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 ifinfomsg iface;
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struct rtattr attr;
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uint8_t data[IFNAMSIZ]; /* IFLA_IFNAME is the only attribute
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* supported */
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};
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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_devices
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*
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* Description:
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* Return a list of all active network devices (devices in the DOWN state
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* are not reported).
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*
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* Parameters:
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* devlist - The location to store the list of devices.
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* nentries - The size of the provided 'devlist' in number of entries each
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* of size sizeof(struct netlib_device_s)
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* family - Address family. See AF_* definitions in sys/socket.h. Use
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* AF_PACKET to return devices for all address families.
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*
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* Return:
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* The number of device entries read is returned on success; a negated
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* errno value is returned on failure.
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*
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****************************************************************************/
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ssize_t netlib_get_devices(FAR struct netlib_device_s *devlist,
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unsigned int nentries, sa_family_t family)
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{
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struct netlib_sendto_request_s req;
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struct netlib_recvfrom_response_s resp;
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struct sockaddr_nl addr;
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static unsigned int seqno = 0;
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unsigned int thiseq;
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ssize_t nsent;
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ssize_t nrecvd;
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size_t ncopied = 0;
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pid_t pid;
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bool enddump;
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int fd;
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int ret;
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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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return -errcode;
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}
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/* Bind the socket so that we can use send() and receive() */
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pid = getpid();
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addr.nl_family = AF_NETLINK;
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addr.nl_pad = 0;
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addr.nl_pid = pid;
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addr.nl_groups = RTM_GETLINK;
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ret = bind(fd, (FAR const struct sockaddr *)&addr,
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sizeof( struct sockaddr_nl));
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if (ret < 0)
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{
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int errcode = errno;
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fprintf(stderr, "ERROR: bind() failed: %d\n", errcode);
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ret = -errcode;
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goto errout_with_socket;
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}
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/* Initialize the request */
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thiseq = ++seqno;
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memset(&req, 0, sizeof(req));
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req.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
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req.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
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req.hdr.nlmsg_seq = thiseq;
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req.hdr.nlmsg_type = RTM_GETLINK;
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req.hdr.nlmsg_pid = pid;
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req.gen.rtgen_family = family;
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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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ret = -errcode;
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goto errout_with_socket;
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}
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/* Read the response(s) */
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for (enddump = false; !enddump; )
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{
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/* Receive the next device response */
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nrecvd = recv(fd, &resp, sizeof(struct netlib_recvfrom_response_s), 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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ret = -errcode;
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goto errout_with_socket;
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}
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/* Verify the data and transfer the device list 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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ret = -EIO;
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goto errout_with_socket;
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}
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/* The sequence number in the response should match the sequence
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* number in the request (since we created the socket, this should
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* always be true).
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*/
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if (resp.hdr.nlmsg_seq != thiseq)
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{
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fprintf(stderr, "ERROR: Bad sequence number in response\n");
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ret = -EIO;
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goto errout_with_socket;
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}
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/* Copy the device list to the caller's buffer */
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switch (resp.hdr.nlmsg_type)
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{
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case NLMSG_DONE:
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enddump = true;
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break;
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case RTM_NEWLINK:
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{
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FAR struct rtattr *attr;
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unsigned int attrlen;
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/* Verify the expected message length */
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if (nrecvd != sizeof(struct netlib_recvfrom_response_s))
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{
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fprintf(stderr, "ERROR: Bad massage size: %ld\n", (long)nrecvd);
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goto errout_with_socket;
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}
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/* Decode the response */
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attr = &resp.attr;
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attrlen = resp.hdr.nlmsg_len - sizeof(struct nlmsghdr) -
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sizeof(struct ifinfomsg);
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for (; RTA_OK(attr, attrlen); attr = RTA_NEXT(attr, attrlen))
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{
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switch (attr->rta_type)
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{
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case IFLA_IFNAME:
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if (ncopied < nentries)
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{
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#ifdef CONFIG_NETDEV_IFINDEX
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FAR struct ifinfomsg *iface = &resp.iface;
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devlist[ncopied].ifindex = iface->ifi_index;
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#endif
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strncpy(devlist[ncopied].ifname,
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(FAR char *)RTA_DATA(attr), IFNAMSIZ);
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ncopied++;
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}
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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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}
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break;
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default:
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fprintf(stderr, "ERROR: Message type %u, length %lu\n",
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resp.hdr.nlmsg_type, (unsigned long)resp.hdr.nlmsg_len);
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ret = -EIO;
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goto errout_with_socket;
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}
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}
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close(fd);
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return ncopied;
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errout_with_socket:
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close(fd);
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return ret;
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}
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#endif /* CONFIG_NETLINK_ROUTE */
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