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103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
/**
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* @file
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* Interface Identification APIs from:
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* RFC 3493: Basic Socket Interface Extensions for IPv6
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* Section 4: Interface Identification
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*
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* @defgroup if_api Interface Identification API
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* @ingroup socket
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*/
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/*
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* Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com>
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* All rights reserved.
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*
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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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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Joel Cunningham <joel.cunningham@me.com>
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*
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*/
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#include "lwip/opt.h"
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#if LWIP_SOCKET
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#include "lwip/errno.h"
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#include "lwip/if_api.h"
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#include "lwip/netifapi.h"
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#include "lwip/priv/sockets_priv.h"
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/**
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* @ingroup if_api
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* Maps an interface index to its corresponding name.
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* @param ifindex interface index
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* @param ifname shall point to a buffer of at least {IF_NAMESIZE} bytes
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* @return If ifindex is an interface index, then the function shall return the
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* value supplied in ifname, which points to a buffer now containing the interface name.
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* Otherwise, the function shall return a NULL pointer.
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*/
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char *
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lwip_if_indextoname(unsigned int ifindex, char *ifname)
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{
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#if LWIP_NETIF_API
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if (ifindex <= 0xff) {
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err_t err = netifapi_netif_index_to_name((u8_t)ifindex, ifname);
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if (!err && ifname[0] != '\0') {
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return ifname;
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}
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}
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#else /* LWIP_NETIF_API */
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LWIP_UNUSED_ARG(ifindex);
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LWIP_UNUSED_ARG(ifname);
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#endif /* LWIP_NETIF_API */
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set_errno(ENXIO);
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return NULL;
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}
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/**
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* @ingroup if_api
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* Returs the interface index corresponding to name ifname.
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* @param ifname Interface name
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* @return The corresponding index if ifname is the name of an interface;
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* otherwise, zero.
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*/
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unsigned int
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lwip_if_nametoindex(const char *ifname)
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{
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#if LWIP_NETIF_API
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err_t err;
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u8_t idx;
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err = netifapi_netif_name_to_index(ifname, &idx);
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if (!err) {
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return idx;
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}
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#else /* LWIP_NETIF_API */
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LWIP_UNUSED_ARG(ifname);
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#endif /* LWIP_NETIF_API */
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return 0; /* invalid index */
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}
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#endif /* LWIP_SOCKET */
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