mirror of git://sourceware.org/git/glibc.git
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <net/if.h>
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#define IF_INET6_FILENAME "/proc/net/if_inet6"
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/* /proc/net/if_inet6 contains lines that look like this:
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*
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* fe8000000000000000000000836fc168 0b 00 20 80 sit7
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*
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* | | | | | |
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* address --' | | | | |
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* index --------' | | | |
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* prefix length ---' | | |
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* scope --------------' | |
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* flags -----------------' |
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* name -------------------------'
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*
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*/
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static int get_one_interface(FILE *fd, char *interface, int iflen, unsigned int *index)
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{
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char buffer[80];
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static char seps[] = " \012";
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char *c = buffer;
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char *sp;
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if (!fgets(buffer, 80, fd))
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return 1;
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if (strtok_r(buffer, seps, &sp) == NULL) return 1;
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if (c = strtok_r(NULL, seps, &sp), c == NULL) return 1;
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*index = strtoul(c, NULL, 16);
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if (strtok_r(NULL, seps, &sp) == NULL) return 1;
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if (strtok_r(NULL, seps, &sp) == NULL) return 1;
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if (strtok_r(NULL, seps, &sp) == NULL) return 1;
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if (c = strtok_r(NULL, seps, &sp), c == NULL) return 1;
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strncpy(interface, c, iflen);
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return 0;
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}
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unsigned int if_nametoindex(const char *ifname)
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{
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FILE *fd = fopen(IF_INET6_FILENAME, "r");
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char this_ifname[IFNAMSIZ];
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unsigned int this_index;
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if (!fd) return 0;
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while (get_one_interface(fd, this_ifname, IFNAMSIZ, &this_index) == 0) {
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if (!strcmp(this_ifname, ifname)) {
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fclose(fd);
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return this_index;
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}
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}
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fclose(fd);
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return 0;
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}
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char *if_indextoname(unsigned int ifindex, char *ifname)
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{
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FILE *fd = fopen(IF_INET6_FILENAME, "r");
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unsigned int this_index;
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if (!fd) return NULL;
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while (get_one_interface(fd, ifname, IFNAMSIZ, &this_index) == 0) {
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if (this_index == ifindex) {
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fclose(fd);
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return ifname;
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}
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}
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fclose(fd);
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return NULL;
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}
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void if_freenameindex(struct if_nameindex *ifn)
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{
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struct if_nameindex *ptr = ifn;
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while (ptr->if_name || ptr->if_index)
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{
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if (ptr->if_name)
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free(ptr->if_name);
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ptr++;
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}
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free(ifn);
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}
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struct if_nameindex *if_nameindex(void)
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{
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FILE *fd = fopen(IF_INET6_FILENAME, "r");
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struct if_nameindex *ifn = NULL;
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int nifs = 0;
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if (!fd) return NULL;
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do
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{
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struct if_nameindex *newifn;
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nifs++;
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newifn = realloc(ifn, nifs*sizeof(struct if_nameindex));
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if (!newifn)
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{
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/* We ran out of memory. */
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if (--nifs)
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{
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free(ifn[nifs-1].if_name);
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ifn[nifs-1].if_name = 0;
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ifn[nifs-1].if_index = 0;
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if_freenameindex(ifn);
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}
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return NULL;
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}
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ifn = newifn;
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ifn[nifs-1].if_index = 0;
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ifn[nifs-1].if_name = malloc(IFNAMSIZ);
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if (ifn[nifs-1].if_name == NULL)
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{
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if_freenameindex(ifn);
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return NULL;
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}
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}
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while (get_one_interface(fd, ifn[nifs-1].if_name, IFNAMSIZ,
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&ifn[nifs-1].if_index) == 0);
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free(ifn[nifs-1].if_name);
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ifn[nifs-1].if_name = NULL;
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fclose(fd);
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return ifn;
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}
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