1/* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * Copyright (c) 2000 Ben Harris. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the project nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31#include <stdint.h> 32#include <stdio.h> 33#include <netdb.h> 34#include <net/if_types.h> 35#include <net/if_dl.h> 36 37static int 38hexname(const uint8_t *cp, size_t len, char *host, size_t hostlen) 39{ 40 int i, n; 41 char *outp = host; 42 43 *outp = '\0'; 44 for (i = 0; i < len; i++) 45 { 46 n = snprintf(outp, hostlen, "%s%02x", i ? ":" : "", cp[i]); 47 if ((n < 0) || (n >= hostlen)) 48 { 49 *host = '\0'; 50 return EAI_MEMORY; 51 } 52 53 outp += n; 54 hostlen -= n; 55 } 56 57 return 0; 58} 59 60/* 61 * getnameinfo_link(): 62 * Format a link-layer address into a printable format, paying attention to 63 * the interface type. 64 */ 65__private_extern__ int 66getnameinfo_link(const struct sockaddr *sa, socklen_t salen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) 67{ 68 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)(const void *)sa; 69 int n; 70 71 if (serv != NULL && servlen > 0) *serv = '\0'; 72 73 if ((sdl->sdl_nlen == 0) && (sdl->sdl_alen == 0) && (sdl->sdl_slen == 0)) 74 { 75 n = snprintf(host, hostlen, "link#%d", sdl->sdl_index); 76 if (n > hostlen) 77 { 78 *host = '\0'; 79 return EAI_MEMORY; 80 } 81 82 return 0; 83 } 84 85 switch (sdl->sdl_type) 86 { 87 /* 88 * The following have zero-length addresses. 89 * IFT_ATM (net/if_atmsubr.c) 90 * IFT_FAITH (net/if_faith.c) 91 * IFT_GIF (net/if_gif.c) 92 * IFT_LOOP (net/if_loop.c) 93 * IFT_PPP (net/if_ppp.c, net/if_spppsubr.c) 94 * IFT_SLIP (net/if_sl.c, net/if_strip.c) 95 * IFT_STF (net/if_stf.c) 96 * IFT_L2VLAN (net/if_vlan.c) 97 * IFT_BRIDGE (net/if_bridge.h> 98 */ 99 /* 100 * The following use IPv4 addresses as link-layer addresses: 101 * IFT_OTHER (net/if_gre.c) 102 * IFT_OTHER (netinet/ip_ipip.c) 103 */ 104 /* default below is believed correct for all these. */ 105 case IFT_ARCNET: 106 case IFT_ETHER: 107 case IFT_FDDI: 108 case IFT_HIPPI: 109 case IFT_ISO88025: 110 default: 111 return hexname((uint8_t *)LLADDR(sdl), (size_t)sdl->sdl_alen, host, hostlen); 112 } 113 114 /* NOTREACHED */ 115 return EAI_FAIL; 116} 117