43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
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* Copyright (c) 2016 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* net/if/if_indextoname.c
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* Get name of network interface by index.
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*/
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#include <errno.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <string.h>
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// TODO: This is better done with a dedicated system call.
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char* if_indextoname(unsigned int ifindex, char* str)
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{
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struct if_nameindex* ifs = if_nameindex();
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if ( !ifs )
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return NULL;
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for ( size_t i = 0; ifs[i].if_index; i++ )
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{
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if ( ifs[i].if_index == ifindex )
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{
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strlcpy(str, ifs[i].if_name, IF_NAMESIZE);
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if_freenameindex(ifs);
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return str;
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}
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}
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if_freenameindex(ifs);
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return errno = ENXIO, (char*) NULL;
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}
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