| | 1 | /* |
| | 2 | * Copyright (c) 2018 Apple Inc. All rights reserved. |
| | 3 | */ |
| | 4 | /* $KAME: if_nametoindex.c,v 1.6 2000/11/24 08:18:54 itojun Exp $ */ |
| | 5 | |
| | 6 | /*- |
| | 7 | * Copyright (c) 1997, 2000 |
| | 8 | * Berkeley Software Design, Inc. All rights reserved. |
| | 9 | * |
| | 10 | * Redistribution and use in source and binary forms, with or without |
| | 11 | * modification, are permitted provided that the following conditions |
| | 12 | * are met: |
| | 13 | * 1. Redistributions of source code must retain the above copyright |
| | 14 | * notice, this list of conditions and the following disclaimer. |
| | 15 | * |
| | 16 | * THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``AS IS'' AND |
| | 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 19 | * ARE DISCLAIMED. IN NO EVENT SHALL Berkeley Software Design, Inc. BE LIABLE |
| | 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 26 | * SUCH DAMAGE. |
| | 27 | * |
| | 28 | * BSDI Id: if_nametoindex.c,v 2.3 2000/04/17 22:38:05 dab Exp |
| | 29 | */ |
| | 30 | |
| | 31 | #include "libinfo_common.h" |
| | 32 | |
| | 33 | #include <sys/types.h> |
| | 34 | #include <sys/socket.h> |
| | 35 | #include <net/if.h> |
| | 36 | #include <net/if_dl.h> |
| | 37 | #include <ifaddrs.h> |
| | 38 | #include <stdlib.h> |
| | 39 | #include <string.h> |
| | 40 | #include <errno.h> |
| | 41 | |
| | 42 | /* |
| | 43 | * From RFC 2553: |
| | 44 | * |
| | 45 | * 4.1 Name-to-Index |
| | 46 | * |
| | 47 | * |
| | 48 | * The first function maps an interface name into its corresponding |
| | 49 | * index. |
| | 50 | * |
| | 51 | * #include <net/if.h> |
| | 52 | * |
| | 53 | * unsigned int if_nametoindex(const char *ifname); |
| | 54 | * |
| | 55 | * If the specified interface name does not exist, the return value is |
| | 56 | * 0, and errno is set to ENXIO. If there was a system error (such as |
| | 57 | * running out of memory), the return value is 0 and errno is set to the |
| | 58 | * proper value (e.g., ENOMEM). |
| | 59 | */ |
| | 60 | |
| | 61 | LIBINFO_EXPORT |
| | 62 | unsigned int |
| | 63 | if_nametoindex(const char *ifname) |
| | 64 | { |
| | 65 | struct ifaddrs *ifaddrs, *ifa; |
| | 66 | unsigned int ni; |
| | 67 | |
| | 68 | if (getifaddrs(&ifaddrs) < 0) |
| | 69 | return(0); |
| | 70 | |
| | 71 | ni = 0; |
| | 72 | |
| | 73 | for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) { |
| | 74 | if (ifa->ifa_addr && |
| | 75 | ifa->ifa_addr->sa_family == AF_LINK && |
| | 76 | strcmp(ifa->ifa_name, ifname) == 0) { |
| | 77 | ni = ((struct sockaddr_dl*)ifa->ifa_addr)->sdl_index; |
| | 78 | break; |
| | 79 | } |
| | 80 | } |
| | 81 | |
| | 82 | freeifaddrs(ifaddrs); |
| | 83 | if (!ni) |
| | 84 | errno = ENXIO; |
| | 85 | return(ni); |
| | 86 | } |
projects / apple / libinfo.git / blame_incremental