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Squashed commit of the following:
apps/netutils/netlib: netlib_ipv[4|6]adaptor() will now use the new routing table interfaces if they are available: If the desination IP address does not correspond to the network served by any device, then the address of the router that should get us to the correct sub-net is is determined. Then the network adaptor that can communicate with the that router has the IP address that will returned.
apps/netutils/netlib: Add new utilities netlib_ipv[4|6]router() that can be used to determine the IP address of a router that would be used some some destination IP address that is not locally accessible.
apps/netutils/netlib: Add helpers for reading the routing table: netlib_read_ipv4route() and netlib_read_ipv6route()
This commit is contained in:
Gregory Nutt
241
netutils/netlib/netlib_ipv6route.c
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241
netutils/netlib/netlib_ipv6route.c
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@@ -0,0 +1,241 @@
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/****************************************************************************
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* netutils/netlib/netlib_ipv6route.c
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*
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* Copyright (C) 2017 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* 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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****************************************************************************/
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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 <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <arpa/inet.h>
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#include "netutils/netlib.h"
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#if defined(CONFIG_NET_IPv6) && defined(HAVE_ROUTE_PROCFS)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Determines the size of an intermediate buffer that must be large enough
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* to handle the longest line generated by this logic.
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*/
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#define PROCFS_LINELEN 58
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/* The form of the entry from the routing table file:
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*
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* 11111111112222222222333333333344444444445555
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* 12345678901234567890123456789012345678901234567890123
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* nnnn. target: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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* netmask: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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* router: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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*/
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#define ADDR_OFFSET 15
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: set_nul_terminator
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*
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* Description:
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* Make sure that the string is NUL terminated.
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*
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****************************************************************************/
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static void set_nul_terminator(FAR char *str)
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{
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while ((*str >= '0' && *str <= '9') || *str == '.')
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{
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str++;
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}
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*str = '\0';
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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_read_ipv6route
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*
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* Description:
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* Read the next entry from the IPv6 routing table.
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*
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* Input Parameters:
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* fd - The open file descriptor to the procfs' IPv6 routing table.
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* route - The location to return that the next routing table entry.
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*
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* Returned Value:
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* sizeof(struct netlib_ipv6_route_s) is returned on success. Zero is
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* returned if the end of file is encounterd. A negated errno value is
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* returned on any failure.
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*
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****************************************************************************/
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ssize_t netlib_read_ipv6route(FILE *stream,
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FAR struct netlib_ipv6_route_s *route)
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{
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char line[PROCFS_LINELEN];
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FAR char *addr;
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int ret;
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DEBUGASSERT(stream != NULL && route != NULL);
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/* The form of the entries read from the routing table:
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*
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* 1111111111222222222233333333334444444444555
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* 1234567890123456789012345678901234567890123456789012
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* nnnn. target: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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* netmask: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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* router: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
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*/
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/* Read the first line from the file */
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if (fgets(line, PROCFS_LINELEN, stream) == NULL)
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{
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/* End of file (or possibly a read error?) */
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return 0;
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}
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/* The first line of the group should consist of a number index */
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if (line[0] < '0' || line[0] > 9)
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{
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return -EINVAL;
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}
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/* Make certain that there is a NUL terminator */
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line[PROCFS_LINELEN - 1] = '\0';
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/* Convert the prefix address to binary */
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addr = &line[ADDR_OFFSET];
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set_nul_terminator(addr);
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ret = inet_pton(AF_INET6, addr, &route->prefix);
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if (ret < 0)
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{
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return ret;
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}
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else if (ret == 0)
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{
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return -EINVAL;
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}
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/* Read the second line from the file */
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if (fgets(line, PROCFS_LINELEN, stream) == NULL)
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{
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/* End of file (or possibly a read error?) */
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return 0;
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}
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/* The second line of the group should not include an index */
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if (line[0] != ' ')
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{
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return -EINVAL;
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}
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/* Make certain that there is a NUL terminator */
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line[PROCFS_LINELEN - 1] = '\0';
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/* Convert the prefix address to binary */
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addr = &line[ADDR_OFFSET];
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set_nul_terminator(addr);
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ret = inet_pton(AF_INET6, addr, &route->netmask);
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if (ret < 0)
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{
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return ret;
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}
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else if (ret == 0)
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{
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return -EINVAL;
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}
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/* Read the third line from the file */
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if (fgets(line, PROCFS_LINELEN, stream) == NULL)
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{
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/* End of file (or possibly a read error?) */
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return 0;
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}
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/* The third line of the group should not include an index */
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if (line[0] != ' ')
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{
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return -EINVAL;
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}
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/* Make certain that there is a NUL terminator */
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line[PROCFS_LINELEN - 1] = '\0';
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/* Convert the prefix address to binary */
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addr = &line[ADDR_OFFSET];
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set_nul_terminator(addr);
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ret = inet_pton(AF_INET6, addr, &route->router);
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if (ret < 0)
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{
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return ret;
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}
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else if (ret == 0)
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{
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return -EINVAL;
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}
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return sizeof(struct netlib_ipv6_route_s);
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}
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#endif /* CONFIG_NET_IPv6 && HAVE_ROUTE_PROCFS */
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