1 /* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: head/lib/libc/net/gai_strerror.c 199083 2009-11-09 12:46:59Z ume $ 30 */ 31 32 #include "namespace.h" 33 #include <netdb.h> 34 #if defined(NLS) 35 #include <nl_types.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include "reentrant.h" 41 #endif 42 #include "un-namespace.h" 43 44 /* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */ 45 /* for backward compatibility with userland code prior to 2553bis-02 */ 46 static const char *ai_errlist[] = { 47 "Success", /* 0 */ 48 "Address family for hostname not supported", /* 1 */ 49 "Temporary failure in name resolution", /* EAI_AGAIN */ 50 "Invalid value for ai_flags", /* EAI_BADFLAGS */ 51 "Non-recoverable failure in name resolution", /* EAI_FAIL */ 52 "ai_family not supported", /* EAI_FAMILY */ 53 "Memory allocation failure", /* EAI_MEMORY */ 54 "No address associated with hostname", /* 7 */ 55 "hostname nor servname provided, or not known", /* EAI_NONAME */ 56 "servname not supported for ai_socktype", /* EAI_SERVICE */ 57 "ai_socktype not supported", /* EAI_SOCKTYPE */ 58 "System error returned in errno", /* EAI_SYSTEM */ 59 "Invalid value for hints", /* EAI_BADHINTS */ 60 "Resolved protocol is unknown", /* EAI_PROTOCOL */ 61 "Argument buffer overflow" /* EAI_OVERFLOW */ 62 }; 63 64 #if defined(NLS) 65 static char gai_buf[NL_TEXTMAX]; 66 static once_t gai_init_once = ONCE_INITIALIZER; 67 static thread_key_t gai_key; 68 static int gai_keycreated = 0; 69 70 static void 71 gai_keycreate(void) 72 { 73 gai_keycreated = (thr_keycreate(&gai_key, free) == 0); 74 } 75 #endif 76 77 const char * 78 gai_strerror(int ecode) 79 { 80 #if defined(NLS) 81 nl_catd catd; 82 char *buf; 83 84 if (thr_main() != 0) 85 buf = gai_buf; 86 else { 87 if (thr_once(&gai_init_once, gai_keycreate) != 0 || 88 !gai_keycreated) 89 goto thr_err; 90 if ((buf = thr_getspecific(gai_key)) == NULL) { 91 if ((buf = malloc(sizeof(gai_buf))) == NULL) 92 goto thr_err; 93 if (thr_setspecific(gai_key, buf) != 0) { 94 free(buf); 95 goto thr_err; 96 } 97 } 98 } 99 100 catd = catopen("libc", NL_CAT_LOCALE); 101 if (ecode > 0 && ecode < EAI_MAX) 102 strlcpy(buf, catgets(catd, 3, ecode, ai_errlist[ecode]), 103 sizeof(gai_buf)); 104 else if (ecode == 0) 105 strlcpy(buf, catgets(catd, 3, NL_MSGMAX - 1, "Success"), 106 sizeof(gai_buf)); 107 else 108 strlcpy(buf, catgets(catd, 3, NL_MSGMAX, "Unknown error"), 109 sizeof(gai_buf)); 110 catclose(catd); 111 return buf; 112 113 thr_err: 114 #endif 115 if (ecode >= 0 && ecode < EAI_MAX) 116 return ai_errlist[ecode]; 117 return "Unknown error"; 118 } 119