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[/] [scarts/] [trunk/] [toolchain/] [scarts-newlib/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [getnameinfo.c] - Blame information for rev 9

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/* The Inner Net License, Version 2.00
 
  The author(s) grant permission for redistribution and use in source and
binary forms, with or without modification, of the software and documentation
provided that the following conditions are met:
 
0. If you receive a version of the software that is specifically labelled
   as not being for redistribution (check the version message and/or README),
   you are not permitted to redistribute that version of the software in any
   way or form.
1. All terms of the all other applicable copyrights and licenses must be
   followed.
2. Redistributions of source code must retain the authors' copyright
   notice(s), this list of conditions, and the following disclaimer.
3. Redistributions in binary form must reproduce the authors' copyright
   notice(s), this list of conditions, and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
4. [The copyright holder has authorized the removal of this clause.]
5. Neither the name(s) of the author(s) nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
  If these license terms cause you a real problem, contact the author.  */
 
/* This software is Copyright 1996 by Craig Metz, All Rights Reserved.  */
 
#include <alloca.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#define _IO_MTSAFE_IO
#include <bits/libc-lock.h>
#include <libc-symbols.h>
#include "local.h"
 
#ifdef HAVE_LIBIDN
# include <libidn/idna.h>
extern int __idna_to_unicode_lzlz (const char *input, char **output,
                                   int flags);
#endif
 
#ifndef min
# define min(x,y) (((x) > (y)) ? (y) : (x))
#endif /* min */
 
libc_freeres_ptr (static char *domain);
 
 
static char *
internal_function
nrl_domainname (void)
{
  static int not_first;
 
  if (! not_first)
    {
      __libc_lock_define_initialized (static, lock);
      __libc_lock_lock (lock);
 
      if (! not_first)
        {
          char *c;
          struct hostent *h, th;
          size_t tmpbuflen = 1024;
          char *tmpbuf = alloca (tmpbuflen);
          int herror;
 
          not_first = 1;
 
          while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h,
                                    &herror))
            {
              if (herror == NETDB_INTERNAL && errno == ERANGE)
                tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
              else
                break;
            }
 
          if (h && (c = strchr (h->h_name, '.')))
            domain = strdup (++c);
          else
            {
              /* The name contains no domain information.  Use the name
                 now to get more information.  */
              while (__gethostname (tmpbuf, tmpbuflen))
                tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);
 
              if ((c = strchr (tmpbuf, '.')))
                domain = strdup (++c);
              else
                {
                  /* We need to preserve the hostname.  */
                  const char *hstname = alloca (strlen (tmpbuf) + 1);
                  strcpy (hstname, tmpbuf);
 
                  while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen,
                                            &h, &herror))
                    {
                      if (herror == NETDB_INTERNAL && errno == ERANGE)
                        tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
                                                2 * tmpbuflen);
                      else
                        break;
                    }
 
                  if (h && (c = strchr(h->h_name, '.')))
                    domain = strdup (++c);
                  else
                    {
                      struct in_addr in_addr;
 
                      in_addr.s_addr = htonl (INADDR_LOOPBACK);
 
                      while (__gethostbyaddr_r ((const char *) &in_addr,
                                                sizeof (struct in_addr),
                                                AF_INET, &th, tmpbuf,
                                                tmpbuflen, &h, &herror))
                        {
                          if (herror == NETDB_INTERNAL && errno == ERANGE)
                            tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
                                                    2 * tmpbuflen);
                          else
                            break;
                        }
 
                      if (h && (c = strchr (h->h_name, '.')))
                        domain = strdup (++c);
                    }
                }
            }
        }
 
      __libc_lock_unlock (lock);
    }
 
  return domain;
};
 
 
int
getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
             socklen_t hostlen, char *serv, socklen_t servlen,
             unsigned int flags)
{
  int serrno = errno;
  int tmpbuflen = 1024;
  int herrno;
  char *tmpbuf = alloca (tmpbuflen);
  struct hostent th;
  int ok = 0;
 
  if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM
#ifdef HAVE_LIBIDN
                |NI_IDN|NI_IDN_ALLOW_UNASSIGNED|NI_IDN_USE_STD3_ASCII_RULES
#endif
                ))
    return EAI_BADFLAGS;
 
  if (sa == NULL || addrlen < sizeof (sa_family_t))
    return EAI_FAMILY;
 
  switch (sa->sa_family)
    {
    case AF_LOCAL:
      if (addrlen < (socklen_t) (((struct sockaddr_un *) NULL)->sun_path))
        return EAI_FAMILY;
      break;
    case AF_INET:
      if (addrlen < sizeof (struct sockaddr_in))
        return EAI_FAMILY;
      break;
    case AF_INET6:
      if (addrlen < sizeof (struct sockaddr_in6))
        return EAI_FAMILY;
      break;
    default:
      return EAI_FAMILY;
    }
 
  if (host != NULL && hostlen > 0)
    switch (sa->sa_family)
      {
      case AF_INET:
      case AF_INET6:
        if (!(flags & NI_NUMERICHOST))
          {
            struct hostent *h = NULL;
            if (h == NULL)
              {
                if (sa->sa_family == AF_INET6)
                  {
                    while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in6 *) sa)->sin6_addr),
                                              sizeof(struct in6_addr),
                                              AF_INET6, &th, tmpbuf, tmpbuflen,
                                              &h, &herrno))
                      {
                        if (herrno == NETDB_INTERNAL)
                          {
                            if (errno == ERANGE)
                              tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
                                                      2 * tmpbuflen);
                            else
                              {
                                h_errno = (herrno);
                                errno = (serrno);
                                return EAI_SYSTEM;
                              }
                          }
                        else
                          {
                            break;
                          }
                      }
                  }
                else
                  {
                    while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr),
                                              sizeof(struct in_addr), AF_INET,
                                              &th, tmpbuf, tmpbuflen,
                                              &h, &herrno))
                      {
                        if (errno == ERANGE)
                          tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
                                                  2 * tmpbuflen);
                        else
                          {
                            break;
                          }
                      }
                  }
              }
 
            if (h)
              {
                char *c;
                if ((flags & NI_NOFQDN)
                    && (c = nrl_domainname ())
                    && (c = strstr (h->h_name, c))
                    && (c != h->h_name) && (*(--c) == '.'))
                  /* Terminate the string after the prefix.  */
                  *c = '\0';
 
#ifdef HAVE_LIBIDN
                /* If requested, convert from the IDN format.  */
                if (flags & NI_IDN)
                  {
                    int idn_flags = 0;
                    if  (flags & NI_IDN_ALLOW_UNASSIGNED)
                      idn_flags |= IDNA_ALLOW_UNASSIGNED;
                    if (flags & NI_IDN_USE_STD3_ASCII_RULES)
                      idn_flags |= IDNA_USE_STD3_ASCII_RULES;
 
                    char *out;
                    int rc = __idna_to_unicode_lzlz (h->h_name, &out,
                                                     idn_flags);
                    if (rc != IDNA_SUCCESS)
                      {
                        if (rc == IDNA_MALLOC_ERROR)
                          return EAI_MEMORY;
                        if (rc == IDNA_DLOPEN_ERROR)
                          return EAI_SYSTEM;
                        return EAI_IDN_ENCODE;
                      }
 
                    if (out != h->h_name)
                      {
                        h->h_name = strdupa (out);
                        free (out);
                      }
                  }
#endif
 
                size_t len = strlen (h->h_name) + 1;
                if (len > hostlen)
                  return EAI_OVERFLOW;
 
                memcpy (host, h->h_name, len);
 
                ok = 1;
              }
          }
 
        if (!ok)
          {
            if (flags & NI_NAMEREQD)
              {
                __set_errno (serrno);
                return EAI_NONAME;
              }
            else
              {
                const char *c;
                if (sa->sa_family == AF_INET6)
                  {
                    const struct sockaddr_in6 *sin6p;
                    uint32_t scopeid;
 
                    sin6p = (const struct sockaddr_in6 *) sa;
 
                    c = inet_ntop (AF_INET6,
                                   (const void *) &sin6p->sin6_addr, host, hostlen);
                    scopeid = sin6p->sin6_scope_id;
                    if (scopeid != 0)
                      {
                        /* Buffer is >= IFNAMSIZ+1.  */
                        char scopebuf[IFNAMSIZ + 1];
                        char *scopeptr;
                        int ni_numericscope = 0;
                        size_t real_hostlen = strnlen (host, hostlen);
                        size_t scopelen = 0;
 
                        scopebuf[0] = SCOPE_DELIMITER;
                        scopebuf[1] = '\0';
                        scopeptr = &scopebuf[1];
 
                        if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)
                            || IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))
                          {
                            if (if_indextoname (scopeid, scopeptr) == NULL)
                              ++ni_numericscope;
                            else
                              scopelen = strlen (scopebuf);
                          }
                        else
                          ++ni_numericscope;
 
                        if (ni_numericscope)
                          scopelen = 1 + snprintf (scopeptr,
                                                     (scopebuf
                                                      + sizeof scopebuf
                                                      - scopeptr),
                                                     "%u", scopeid);
 
                        if (real_hostlen + scopelen + 1 > hostlen)
                          /* XXX We should not fail here.  Simply enlarge
                             the buffer or return with out of memory.  */
                          return EAI_SYSTEM;
                        memcpy (host + real_hostlen, scopebuf, scopelen + 1);
                      }
                  }
                else
                  c = inet_ntop (AF_INET,
                                 (const void *) &(((const struct sockaddr_in *) sa)->sin_addr),
                                 host, hostlen);
                if (c == NULL)
                  {
                    __set_errno (serrno);
                    return EAI_SYSTEM;
                  }
              }
            ok = 1;
          }
        break;
 
      case AF_LOCAL:
        if (!(flags & NI_NUMERICHOST))
          {
            struct utsname utsname;
 
            if (!uname (&utsname))
              {
                strncpy (host, utsname.nodename, hostlen);
                break;
              };
          };
 
        if (flags & NI_NAMEREQD)
           {
            __set_errno (serrno);
            return EAI_NONAME;
          }
 
        strncpy (host, "localhost", hostlen);
        break;
 
      default:
        return EAI_FAMILY;
    }
 
  if (serv && (servlen > 0))
    switch (sa->sa_family)
      {
      case AF_INET:
      case AF_INET6:
        if (!(flags & NI_NUMERICSERV))
          {
            struct servent *s, ts;
            while (__getservbyport_r (((const struct sockaddr_in *) sa)->sin_port,
                                      ((flags & NI_DGRAM) ? "udp" : "tcp"),
                                      &ts, tmpbuf, tmpbuflen, &s))
              {
                if (herrno == NETDB_INTERNAL)
                  {
                    if (errno == ERANGE)
                      tmpbuf = extend_alloca (tmpbuf, tmpbuflen,
                                              2 * tmpbuflen);
                    else
                      {
                        __set_errno (serrno);
                        return EAI_SYSTEM;
                      }
                  }
                else
                  {
                    break;
                  }
              }
            if (s)
              {
                strncpy (serv, s->s_name, servlen);
                break;
              }
          }
 
        if (snprintf (serv, servlen, "%d",
                        ntohs (((const struct sockaddr_in *) sa)->sin_port))
            + 1 > servlen)
          return EAI_OVERFLOW;
 
        break;
 
      case AF_LOCAL:
        strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
        break;
    }
 
  if (host && (hostlen > 0))
    host[hostlen-1] = 0;
  if (serv && (servlen > 0))
    serv[servlen-1] = 0;
  errno = serrno;
  return 0;
}
libc_hidden_def (getnameinfo)

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[/] [scarts/] [trunk/] [toolchain/] [scarts-newlib/] [newlib-1.17.0/] [newlib/] [libc/] [sys/] [linux/] [net/] [getnameinfo.c] - Blame information for rev 9

Line No.	Rev	Author	Line
1	9	jlechner	`/* The Inner Net License, Version 2.00`
2
3			`The author(s) grant permission for redistribution and use in source and`
4			`binary forms, with or without modification, of the software and documentation`
5			`provided that the following conditions are met:`
6
7			`0. If you receive a version of the software that is specifically labelled`
8			`as not being for redistribution (check the version message and/or README),`
9			`you are not permitted to redistribute that version of the software in any`
10			`way or form.`
11			`1. All terms of the all other applicable copyrights and licenses must be`
12			`followed.`
13			`2. Redistributions of source code must retain the authors' copyright`
14			`notice(s), this list of conditions, and the following disclaimer.`
15			`3. Redistributions in binary form must reproduce the authors' copyright`
16			`notice(s), this list of conditions, and the following disclaimer in the`
17			`documentation and/or other materials provided with the distribution.`
18			`4. [The copyright holder has authorized the removal of this clause.]`
19			`5. Neither the name(s) of the author(s) nor the names of its contributors`
20			`may be used to endorse or promote products derived from this software`
21			`without specific prior written permission.`
22
23			THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
24			`EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED`
25			`WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE`
26			`DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY`
27			`DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES`
28			`(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;`
29			`LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON`
30			`ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT`
31			`(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS`
32			`SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.`
33
34			`If these license terms cause you a real problem, contact the author. */`
35
36			`/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */`
37
38			`#include <alloca.h>`
39			`#include <errno.h>`
40			`#include <netdb.h>`
41			`#include <stdlib.h>`
42			`#include <stdio.h>`
43			`#include <string.h>`
44			`#include <unistd.h>`
45			`#include <arpa/inet.h>`
46			`#include <net/if.h>`
47			`#include <netinet/in.h>`
48			`#include <sys/param.h>`
49			`#include <sys/socket.h>`
50			`#include <sys/types.h>`
51			`#include <sys/un.h>`
52			`#include <sys/utsname.h>`
53			`#define _IO_MTSAFE_IO`
54			`#include <bits/libc-lock.h>`
55			`#include <libc-symbols.h>`
56			`#include "local.h"`
57
58			`#ifdef HAVE_LIBIDN`
59			`# include <libidn/idna.h>`
60			`extern int __idna_to_unicode_lzlz (const char input, char *output,`
61			`int flags);`
62			`#endif`
63
64			`#ifndef min`
65			`# define min(x,y) (((x) > (y)) ? (y) : (x))`
66			`#endif /* min */`
67
68			`libc_freeres_ptr (static char *domain);`
69
70
71			`static char *`
72			`internal_function`
73			`nrl_domainname (void)`
74			`{`
75			`static int not_first;`
76
77			`if (! not_first)`
78			`{`
79			`__libc_lock_define_initialized (static, lock);`
80			`__libc_lock_lock (lock);`
81
82			`if (! not_first)`
83			`{`
84			`char *c;`
85			`struct hostent *h, th;`
86			`size_t tmpbuflen = 1024;`
87			`char *tmpbuf = alloca (tmpbuflen);`
88			`int herror;`
89
90			`not_first = 1;`
91
92			`while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h,`
93			`&herror))`
94			`{`
95			`if (herror == NETDB_INTERNAL && errno == ERANGE)`
96			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);`
97			`else`
98			`break;`
99			`}`
100
101			`if (h && (c = strchr (h->h_name, '.')))`
102			`domain = strdup (++c);`
103			`else`
104			`{`
105			`/* The name contains no domain information. Use the name`
106			`now to get more information. */`
107			`while (__gethostname (tmpbuf, tmpbuflen))`
108			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen, 2 * tmpbuflen);`
109
110			`if ((c = strchr (tmpbuf, '.')))`
111			`domain = strdup (++c);`
112			`else`
113			`{`
114			`/* We need to preserve the hostname. */`
115			`const char *hstname = alloca (strlen (tmpbuf) + 1);`
116			`strcpy (hstname, tmpbuf);`
117
118			`while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen,`
119			`&h, &herror))`
120			`{`
121			`if (herror == NETDB_INTERNAL && errno == ERANGE)`
122			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen,`
123			`2 * tmpbuflen);`
124			`else`
125			`break;`
126			`}`
127
128			`if (h && (c = strchr(h->h_name, '.')))`
129			`domain = strdup (++c);`
130			`else`
131			`{`
132			`struct in_addr in_addr;`
133
134			`in_addr.s_addr = htonl (INADDR_LOOPBACK);`
135
136			`while (__gethostbyaddr_r ((const char *) &in_addr,`
137			`sizeof (struct in_addr),`
138			`AF_INET, &th, tmpbuf,`
139			`tmpbuflen, &h, &herror))`
140			`{`
141			`if (herror == NETDB_INTERNAL && errno == ERANGE)`
142			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen,`
143			`2 * tmpbuflen);`
144			`else`
145			`break;`
146			`}`
147
148			`if (h && (c = strchr (h->h_name, '.')))`
149			`domain = strdup (++c);`
150			`}`
151			`}`
152			`}`
153			`}`
154
155			`__libc_lock_unlock (lock);`
156			`}`
157
158			`return domain;`
159			`};`
160
161
162			`int`
163			`getnameinfo (const struct sockaddr sa, socklen_t addrlen, char host,`
164			`socklen_t hostlen, char *serv, socklen_t servlen,`
165			`unsigned int flags)`
166			`{`
167			`int serrno = errno;`
168			`int tmpbuflen = 1024;`
169			`int herrno;`
170			`char *tmpbuf = alloca (tmpbuflen);`
171			`struct hostent th;`
172			`int ok = 0;`
173
174			`if (flags & ~(NI_NUMERICHOST\|NI_NUMERICSERV\|NI_NOFQDN\|NI_NAMEREQD\|NI_DGRAM`
175			`#ifdef HAVE_LIBIDN`
176			`\|NI_IDN\|NI_IDN_ALLOW_UNASSIGNED\|NI_IDN_USE_STD3_ASCII_RULES`
177			`#endif`
178			`))`
179			`return EAI_BADFLAGS;`
180
181			`if (sa == NULL \|\| addrlen < sizeof (sa_family_t))`
182			`return EAI_FAMILY;`
183
184			`switch (sa->sa_family)`
185			`{`
186			`case AF_LOCAL:`
187			`if (addrlen < (socklen_t) (((struct sockaddr_un *) NULL)->sun_path))`
188			`return EAI_FAMILY;`
189			`break;`
190			`case AF_INET:`
191			`if (addrlen < sizeof (struct sockaddr_in))`
192			`return EAI_FAMILY;`
193			`break;`
194			`case AF_INET6:`
195			`if (addrlen < sizeof (struct sockaddr_in6))`
196			`return EAI_FAMILY;`
197			`break;`
198			`default:`
199			`return EAI_FAMILY;`
200			`}`
201
202			`if (host != NULL && hostlen > 0)`
203			`switch (sa->sa_family)`
204			`{`
205			`case AF_INET:`
206			`case AF_INET6:`
207			`if (!(flags & NI_NUMERICHOST))`
208			`{`
209			`struct hostent *h = NULL;`
210			`if (h == NULL)`
211			`{`
212			`if (sa->sa_family == AF_INET6)`
213			`{`
214			`while (__gethostbyaddr_r ((const void ) &(((const struct sockaddr_in6 ) sa)->sin6_addr),`
215			`sizeof(struct in6_addr),`
216			`AF_INET6, &th, tmpbuf, tmpbuflen,`
217			`&h, &herrno))`
218			`{`
219			`if (herrno == NETDB_INTERNAL)`
220			`{`
221			`if (errno == ERANGE)`
222			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen,`
223			`2 * tmpbuflen);`
224			`else`
225			`{`
226			`h_errno = (herrno);`
227			`errno = (serrno);`
228			`return EAI_SYSTEM;`
229			`}`
230			`}`
231			`else`
232			`{`
233			`break;`
234			`}`
235			`}`
236			`}`
237			`else`
238			`{`
239			`while (__gethostbyaddr_r ((const void ) &(((const struct sockaddr_in )sa)->sin_addr),`
240			`sizeof(struct in_addr), AF_INET,`
241			`&th, tmpbuf, tmpbuflen,`
242			`&h, &herrno))`
243			`{`
244			`if (errno == ERANGE)`
245			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen,`
246			`2 * tmpbuflen);`
247			`else`
248			`{`
249			`break;`
250			`}`
251			`}`
252			`}`
253			`}`
254
255			`if (h)`
256			`{`
257			`char *c;`
258			`if ((flags & NI_NOFQDN)`
259			`&& (c = nrl_domainname ())`
260			`&& (c = strstr (h->h_name, c))`
261			`&& (c != h->h_name) && (*(--c) == '.'))`
262			`/* Terminate the string after the prefix. */`
263			`*c = '\0';`
264
265			`#ifdef HAVE_LIBIDN`
266			`/* If requested, convert from the IDN format. */`
267			`if (flags & NI_IDN)`
268			`{`
269			`int idn_flags = 0;`
270			`if (flags & NI_IDN_ALLOW_UNASSIGNED)`
271			`idn_flags \|= IDNA_ALLOW_UNASSIGNED;`
272			`if (flags & NI_IDN_USE_STD3_ASCII_RULES)`
273			`idn_flags \|= IDNA_USE_STD3_ASCII_RULES;`
274
275			`char *out;`
276			`int rc = __idna_to_unicode_lzlz (h->h_name, &out,`
277			`idn_flags);`
278			`if (rc != IDNA_SUCCESS)`
279			`{`
280			`if (rc == IDNA_MALLOC_ERROR)`
281			`return EAI_MEMORY;`
282			`if (rc == IDNA_DLOPEN_ERROR)`
283			`return EAI_SYSTEM;`
284			`return EAI_IDN_ENCODE;`
285			`}`
286
287			`if (out != h->h_name)`
288			`{`
289			`h->h_name = strdupa (out);`
290			`free (out);`
291			`}`
292			`}`
293			`#endif`
294
295			`size_t len = strlen (h->h_name) + 1;`
296			`if (len > hostlen)`
297			`return EAI_OVERFLOW;`
298
299			`memcpy (host, h->h_name, len);`
300
301			`ok = 1;`
302			`}`
303			`}`
304
305			`if (!ok)`
306			`{`
307			`if (flags & NI_NAMEREQD)`
308			`{`
309			`__set_errno (serrno);`
310			`return EAI_NONAME;`
311			`}`
312			`else`
313			`{`
314			`const char *c;`
315			`if (sa->sa_family == AF_INET6)`
316			`{`
317			`const struct sockaddr_in6 *sin6p;`
318			`uint32_t scopeid;`
319
320			`sin6p = (const struct sockaddr_in6 *) sa;`
321
322			`c = inet_ntop (AF_INET6,`
323			`(const void *) &sin6p->sin6_addr, host, hostlen);`
324			`scopeid = sin6p->sin6_scope_id;`
325			`if (scopeid != 0)`
326			`{`
327			`/* Buffer is >= IFNAMSIZ+1. */`
328			`char scopebuf[IFNAMSIZ + 1];`
329			`char *scopeptr;`
330			`int ni_numericscope = 0;`
331			`size_t real_hostlen = strnlen (host, hostlen);`
332			`size_t scopelen = 0;`
333
334			`scopebuf[0] = SCOPE_DELIMITER;`
335			`scopebuf[1] = '\0';`
336			`scopeptr = &scopebuf[1];`
337
338			`if (IN6_IS_ADDR_LINKLOCAL (&sin6p->sin6_addr)`
339			`\|\| IN6_IS_ADDR_MC_LINKLOCAL (&sin6p->sin6_addr))`
340			`{`
341			`if (if_indextoname (scopeid, scopeptr) == NULL)`
342			`++ni_numericscope;`
343			`else`
344			`scopelen = strlen (scopebuf);`
345			`}`
346			`else`
347			`++ni_numericscope;`
348
349			`if (ni_numericscope)`
350			`scopelen = 1 + snprintf (scopeptr,`
351			`(scopebuf`
352			`+ sizeof scopebuf`
353			`- scopeptr),`
354			`"%u", scopeid);`
355
356			`if (real_hostlen + scopelen + 1 > hostlen)`
357			`/* XXX We should not fail here. Simply enlarge`
358			`the buffer or return with out of memory. */`
359			`return EAI_SYSTEM;`
360			`memcpy (host + real_hostlen, scopebuf, scopelen + 1);`
361			`}`
362			`}`
363			`else`
364			`c = inet_ntop (AF_INET,`
365			`(const void ) &(((const struct sockaddr_in ) sa)->sin_addr),`
366			`host, hostlen);`
367			`if (c == NULL)`
368			`{`
369			`__set_errno (serrno);`
370			`return EAI_SYSTEM;`
371			`}`
372			`}`
373			`ok = 1;`
374			`}`
375			`break;`
376
377			`case AF_LOCAL:`
378			`if (!(flags & NI_NUMERICHOST))`
379			`{`
380			`struct utsname utsname;`
381
382			`if (!uname (&utsname))`
383			`{`
384			`strncpy (host, utsname.nodename, hostlen);`
385			`break;`
386			`};`
387			`};`
388
389			`if (flags & NI_NAMEREQD)`
390			`{`
391			`__set_errno (serrno);`
392			`return EAI_NONAME;`
393			`}`
394
395			`strncpy (host, "localhost", hostlen);`
396			`break;`
397
398			`default:`
399			`return EAI_FAMILY;`
400			`}`
401
402			`if (serv && (servlen > 0))`
403			`switch (sa->sa_family)`
404			`{`
405			`case AF_INET:`
406			`case AF_INET6:`
407			`if (!(flags & NI_NUMERICSERV))`
408			`{`
409			`struct servent *s, ts;`
410			`while (__getservbyport_r (((const struct sockaddr_in *) sa)->sin_port,`
411			`((flags & NI_DGRAM) ? "udp" : "tcp"),`
412			`&ts, tmpbuf, tmpbuflen, &s))`
413			`{`
414			`if (herrno == NETDB_INTERNAL)`
415			`{`
416			`if (errno == ERANGE)`
417			`tmpbuf = extend_alloca (tmpbuf, tmpbuflen,`
418			`2 * tmpbuflen);`
419			`else`
420			`{`
421			`__set_errno (serrno);`
422			`return EAI_SYSTEM;`
423			`}`
424			`}`
425			`else`
426			`{`
427			`break;`
428			`}`
429			`}`
430			`if (s)`
431			`{`
432			`strncpy (serv, s->s_name, servlen);`
433			`break;`
434			`}`
435			`}`
436
437			`if (snprintf (serv, servlen, "%d",`
438			`ntohs (((const struct sockaddr_in *) sa)->sin_port))`
439			`+ 1 > servlen)`
440			`return EAI_OVERFLOW;`
441
442			`break;`
443
444			`case AF_LOCAL:`
445			`strncpy (serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);`
446			`break;`
447			`}`
448
449			`if (host && (hostlen > 0))`
450			`host[hostlen-1] = 0;`
451			`if (serv && (servlen > 0))`
452			`serv[servlen-1] = 0;`
453			`errno = serrno;`
454			`return 0;`
455			`}`
456			`libc_hidden_def (getnameinfo)`