148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/* $KAME: if_nameindex.c,v 1.8 2000/11/24 08:20:01 itojun Exp $ */
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/*-
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* Copyright (c) 1997, 2000
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* Berkeley Software Design, Inc. All rights reserved.
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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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* 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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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* BSDI Id: if_nameindex.c,v 2.3 2000/04/17 22:38:05 dab Exp
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if_dl.h>
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#include <net/if.h>
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#include <ifaddrs.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* From RFC 2553:
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*
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* 4.3 Return All Interface Names and Indexes
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*
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* The if_nameindex structure holds the information about a single
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* interface and is defined as a result of including the <net/if.h>
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* header.
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*
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* struct if_nameindex {
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* unsigned int if_index;
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* char *if_name;
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* };
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*
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* The final function returns an array of if_nameindex structures, one
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* structure per interface.
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*
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* struct if_nameindex *if_nameindex(void);
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*
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* The end of the array of structures is indicated by a structure with
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* an if_index of 0 and an if_name of NULL. The function returns a NULL
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* pointer upon an error, and would set errno to the appropriate value.
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*
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* The memory used for this array of structures along with the interface
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* names pointed to by the if_name members is obtained dynamically.
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* This memory is freed by the next function.
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*
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* 4.4. Free Memory
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*
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* The following function frees the dynamic memory that was allocated by
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* if_nameindex().
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*
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* #include <net/if.h>
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*
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* void if_freenameindex(struct if_nameindex *ptr);
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*
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* The argument to this function must be a pointer that was returned by
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* if_nameindex().
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*/
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struct if_nameindex *
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if_nameindex(void)
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{
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struct ifaddrs *ifaddrs, *ifa;
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unsigned int ni;
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int nbytes;
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struct if_nameindex *ifni, *ifni2;
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char *cp;
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if (getifaddrs(&ifaddrs) < 0)
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return(NULL);
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/*
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* First, find out how many interfaces there are, and how
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* much space we need for the string names.
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*/
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ni = 0;
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nbytes = 0;
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_LINK) {
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nbytes += strlen(ifa->ifa_name) + 1;
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ni++;
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}
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}
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/*
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* Next, allocate a chunk of memory, use the first part
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* for the array of structures, and the last part for
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* the strings.
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*/
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cp = malloc((ni + 1) * sizeof(struct if_nameindex) + nbytes);
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ifni = (struct if_nameindex *)cp;
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if (ifni == NULL)
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goto out;
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cp += (ni + 1) * sizeof(struct if_nameindex);
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/*
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* Now just loop through the list of interfaces again,
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* filling in the if_nameindex array and making copies
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* of all the strings.
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*/
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ifni2 = ifni;
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for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
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if (ifa->ifa_addr &&
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ifa->ifa_addr->sa_family == AF_LINK) {
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ifni2->if_index =
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((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index;
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ifni2->if_name = cp;
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strcpy(cp, ifa->ifa_name);
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ifni2++;
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cp += strlen(cp) + 1;
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}
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}
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/*
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* Finally, don't forget to terminate the array.
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*/
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ifni2->if_index = 0;
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ifni2->if_name = NULL;
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out:
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freeifaddrs(ifaddrs);
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return(ifni);
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}
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void
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if_freenameindex(struct if_nameindex *ptr)
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{
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free(ptr);
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}
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