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1 | office | 1 | /** |
2 | * @file |
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3 | * Interface Identification APIs from: |
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4 | * RFC 3493: Basic Socket Interface Extensions for IPv6 |
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5 | * Section 4: Interface Identification |
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6 | * |
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7 | * @defgroup if_api Interface Identification API |
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8 | * @ingroup socket |
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9 | */ |
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10 | |||
11 | /* |
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12 | * Copyright (c) 2017 Joel Cunningham, Garmin International, Inc. <joel.cunningham@garmin.com> |
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13 | * All rights reserved. |
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14 | * |
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15 | * Redistribution and use in source and binary forms, with or without modification, |
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16 | * are permitted provided that the following conditions are met: |
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17 | * |
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18 | * 1. Redistributions of source code must retain the above copyright notice, |
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19 | * this list of conditions and the following disclaimer. |
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20 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
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21 | * this list of conditions and the following disclaimer in the documentation |
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22 | * and/or other materials provided with the distribution. |
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23 | * 3. The name of the author may not be used to endorse or promote products |
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24 | * derived from this software without specific prior written permission. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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27 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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28 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT |
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29 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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30 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT |
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31 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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32 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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33 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
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34 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY |
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35 | * OF SUCH DAMAGE. |
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36 | * |
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37 | * This file is part of the lwIP TCP/IP stack. |
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38 | * |
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39 | * Author: Joel Cunningham <joel.cunningham@me.com> |
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40 | * |
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41 | */ |
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42 | #include "lwip/opt.h" |
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43 | |||
44 | #if LWIP_SOCKET |
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45 | |||
46 | #include "lwip/errno.h" |
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47 | #include "lwip/if_api.h" |
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48 | #include "lwip/netifapi.h" |
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49 | #include "lwip/priv/sockets_priv.h" |
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50 | |||
51 | /** |
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52 | * @ingroup if_api |
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53 | * Maps an interface index to its corresponding name. |
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54 | * @param ifindex interface index |
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55 | * @param ifname shall point to a buffer of at least {IF_NAMESIZE} bytes |
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56 | * @return If ifindex is an interface index, then the function shall return the |
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57 | * value supplied in ifname, which points to a buffer now containing the interface name. |
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58 | * Otherwise, the function shall return a NULL pointer. |
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59 | */ |
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60 | char * |
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61 | lwip_if_indextoname(unsigned int ifindex, char *ifname) |
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62 | { |
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63 | #if LWIP_NETIF_API |
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64 | if (ifindex <= 0xff) { |
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65 | err_t err = netifapi_netif_index_to_name((u8_t)ifindex, ifname); |
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66 | if (!err && ifname[0] != '\0') { |
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67 | return ifname; |
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68 | } |
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69 | } |
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70 | #else /* LWIP_NETIF_API */ |
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71 | LWIP_UNUSED_ARG(ifindex); |
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72 | LWIP_UNUSED_ARG(ifname); |
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73 | #endif /* LWIP_NETIF_API */ |
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74 | set_errno(ENXIO); |
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75 | return NULL; |
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76 | } |
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77 | |||
78 | /** |
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79 | * @ingroup if_api |
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80 | * Returs the interface index corresponding to name ifname. |
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81 | * @param ifname Interface name |
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82 | * @return The corresponding index if ifname is the name of an interface; |
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83 | * otherwise, zero. |
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84 | */ |
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85 | unsigned int |
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86 | lwip_if_nametoindex(const char *ifname) |
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87 | { |
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88 | #if LWIP_NETIF_API |
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89 | err_t err; |
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90 | u8_t idx; |
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91 | |||
92 | err = netifapi_netif_name_to_index(ifname, &idx); |
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93 | if (!err) { |
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94 | return idx; |
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95 | } |
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96 | #else /* LWIP_NETIF_API */ |
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97 | LWIP_UNUSED_ARG(ifname); |
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98 | #endif /* LWIP_NETIF_API */ |
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99 | return 0; /* invalid index */ |
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100 | } |
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101 | |||
102 | #endif /* LWIP_SOCKET */ |