lib/libc/net/gai_strerror.c

   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 }