projects / apple / libinfo.git / blame
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|---|---|---|
| 3b7c7bd7 A |
1 | /* $KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $ */ |
| 2 | ||
| 3 | /*- | |
| 4 | * Copyright (c) 1997, 2000 | |
| 5 | * Berkeley Software Design, Inc. All rights reserved. | |
| 6 | * | |
| 7 | * Redistribution and use in source and binary forms, with or without | |
| 8 | * modification, are permitted provided that the following conditions | |
| 9 | * are met: | |
| 10 | * 1. Redistributions of source code must retain the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer. | |
| 12 | * | |
| 13 | * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND | |
| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE | |
| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 23 | * SUCH DAMAGE. | |
| 24 | * | |
| 25 | * BSDI Id: if_nametoindex.c,v 2.3 2000/04/17 22:38:05 dab Exp | |
| 26 | */ | |
| 27 | ||
| 28 | #include <sys/types.h> | |
| 29 | #include <sys/socket.h> | |
| 30 | #include <net/if.h> | |
| 31 | #include <net/if_dl.h> | |
| 32 | #include <ifaddrs.h> | |
| 33 | #include <stdlib.h> | |
| 34 | #include <string.h> | |
| 35 | #include <errno.h> | |
| 36 | ||
| 37 | /* | |
| 38 | * From RFC 2553: | |
| 39 | * | |
| 40 | * 4.1 Name-to-Index | |
| 41 | * | |
| 42 | * | |
| 43 | * The first function maps an interface name into its corresponding | |
| 44 | * index. | |
| 45 | * | |
| 46 | * #include <net/if.h> | |
| 47 | * | |
| 48 | * unsigned int if_nametoindex(const char *ifname); | |
| 49 | * | |
| 50 | * If the specified interface name does not exist, the return value is | |
| 51 | * 0, and errno is set to ENXIO. If there was a system error (such as | |
| 52 | * running out of memory), the return value is 0 and errno is set to the | |
| 53 | * proper value (e.g., ENOMEM). | |
| 54 | */ | |
| 55 | ||
| 56 | unsigned int | |
| 57 | if_nametoindex(const char *ifname) | |
| 58 | { | |
| 59 | struct ifaddrs *ifaddrs, *ifa; | |
| 60 | unsigned int ni; | |
| 61 | ||
| 62 | if (getifaddrs(&ifaddrs) < 0) | |
| 63 | return(0); | |
| 64 | ||
| 65 | ni = 0; | |
| 66 | ||
| 67 | for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) { | |
| 68 | if (ifa->ifa_addr && | |
| 69 | ifa->ifa_addr->sa_family == AF_LINK && | |
| 70 | strcmp(ifa->ifa_name, ifname) == 0) { | |
| 71 | ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index; | |
| 72 | break; | |
| 73 | } | |
| 74 | } | |
| 75 | ||
| 76 | freeifaddrs(ifaddrs); | |
| 77 | if (!ni) | |
| 78 | errno = ENXIO; | |
| 79 | return(ni); | |
| 80 | } |