1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * 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 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 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 /* 45 * Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) were omitted from RFC 3493, 46 * but are or may be used as extensions or in old code. 47 */ 48 static const char *const ai_errlist[] = { 49 [0] = "Success", 50 [EAI_ADDRFAMILY] = "Address family for hostname not supported", 51 [EAI_AGAIN] = "Name could not be resolved at this time", 52 [EAI_BADFLAGS] = "Flags parameter had an invalid value", 53 [EAI_FAIL] = "Non-recoverable failure in name resolution", 54 [EAI_FAMILY] = "Address family not recognized", 55 [EAI_MEMORY] = "Memory allocation failure", 56 [EAI_NODATA] = "No address associated with hostname", 57 [EAI_NONAME] = "Name does not resolve", 58 [EAI_SERVICE] = "Service was not recognized for socket type", 59 [EAI_SOCKTYPE] = "Intended socket type was not recognized", 60 [EAI_SYSTEM] = "System error returned in errno", 61 [EAI_BADHINTS] = "Invalid value for hints", 62 [EAI_PROTOCOL] = "Resolved protocol is unknown", 63 [EAI_OVERFLOW] = "Argument buffer overflow", 64 }; 65 66 #if defined(NLS) 67 static char gai_buf[NL_TEXTMAX]; 68 static once_t gai_init_once = ONCE_INITIALIZER; 69 static thread_key_t gai_key; 70 static int gai_keycreated = 0; 71 72 static void 73 gai_keycreate(void) 74 { 75 gai_keycreated = thr_keycreate(&gai_key, free) == 0; 76 } 77 #endif 78 79 const char * 80 gai_strerror(int ecode) 81 { 82 #if defined(NLS) 83 nl_catd catd; 84 char *buf; 85 int saved_errno; 86 87 saved_errno = errno; 88 if (thr_main() != 0) 89 buf = gai_buf; 90 else { 91 if (thr_once(&gai_init_once, gai_keycreate) != 0 || 92 !gai_keycreated) 93 goto thr_err; 94 if ((buf = thr_getspecific(gai_key)) == NULL) { 95 if ((buf = malloc(sizeof(gai_buf))) == NULL) 96 goto thr_err; 97 if (thr_setspecific(gai_key, buf) != 0) { 98 free(buf); 99 goto thr_err; 100 } 101 } 102 } 103 104 catd = catopen("libc", NL_CAT_LOCALE); 105 if (ecode > 0 && ecode < EAI_MAX) 106 strlcpy(buf, catgets(catd, 3, ecode, ai_errlist[ecode]), 107 sizeof(gai_buf)); 108 else if (ecode == 0) 109 strlcpy(buf, catgets(catd, 3, NL_MSGMAX - 1, "Success"), 110 sizeof(gai_buf)); 111 else 112 strlcpy(buf, catgets(catd, 3, NL_MSGMAX, "Unknown error"), 113 sizeof(gai_buf)); 114 catclose(catd); 115 errno = saved_errno; 116 return (buf); 117 118 thr_err: 119 errno = saved_errno; 120 #endif 121 if (ecode >= 0 && ecode < EAI_MAX) 122 return (ai_errlist[ecode]); 123 return ("Unknown error"); 124 } 125