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glibc/inet/getnameinfo.c
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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 <errno.h> | |
#include <netdb.h> | |
#include <stddef.h> | |
#include <stdlib.h> | |
#include <stdio.h> | |
#include <string.h> | |
#include <unistd.h> | |
#include <stdint.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> | |
#include <libc-lock.h> | |
#include <scratch_buffer.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; | |
int herror; | |
struct scratch_buffer tmpbuf; | |
scratch_buffer_init (&tmpbuf); | |
not_first = 1; | |
while (__gethostbyname_r ("localhost", &th, | |
tmpbuf.data, tmpbuf.length, | |
&h, &herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
goto done; | |
} | |
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.data, tmpbuf.length)) | |
if (!scratch_buffer_grow (&tmpbuf)) | |
goto done; | |
if ((c = strchr (tmpbuf.data, '.'))) | |
domain = __strdup (++c); | |
else | |
{ | |
/* We need to preserve the hostname. */ | |
const char *hstname = strdupa (tmpbuf.data); | |
while (__gethostbyname_r (hstname, &th, | |
tmpbuf.data, tmpbuf.length, | |
&h, &herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
goto done; | |
} | |
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.data, tmpbuf.length, | |
&h, &herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
goto done; | |
} | |
else | |
break; | |
} | |
if (h && (c = strchr (h->h_name, '.'))) | |
domain = __strdup (++c); | |
} | |
} | |
} | |
done: | |
scratch_buffer_free (&tmpbuf); | |
} | |
__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, | |
int flags) | |
{ | |
int serrno = errno; | |
int herrno; | |
struct hostent th; | |
int ok = 0; | |
struct scratch_buffer tmpbuf; | |
scratch_buffer_init (&tmpbuf); | |
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; | |
if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL) | |
return EAI_NONAME; | |
switch (sa->sa_family) | |
{ | |
case AF_LOCAL: | |
if (addrlen < (socklen_t) offsetof (struct sockaddr_un, 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 (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.data, tmpbuf.length, | |
&h, &herrno)) | |
if (herrno == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
{ | |
__set_h_errno (herrno); | |
return EAI_MEMORY; | |
} | |
} | |
else | |
break; | |
} | |
else | |
{ | |
while (__gethostbyaddr_r ((const void *) &(((const struct sockaddr_in *)sa)->sin_addr), | |
sizeof(struct in_addr), | |
AF_INET, &th, | |
tmpbuf.data, tmpbuf.length, | |
&h, &herrno)) | |
if (herrno == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
{ | |
__set_h_errno (herrno); | |
return EAI_MEMORY; | |
} | |
} | |
else | |
break; | |
} | |
if (h == NULL) | |
{ | |
if (herrno == NETDB_INTERNAL) | |
{ | |
__set_h_errno (herrno); | |
return EAI_SYSTEM; | |
} | |
if (herrno == TRY_AGAIN) | |
{ | |
__set_h_errno (herrno); | |
return EAI_AGAIN; | |
} | |
} | |
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) | |
/* Signal the buffer is too small. This is | |
what inet_ntop does. */ | |
c = NULL; | |
else | |
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) | |
return EAI_OVERFLOW; | |
} | |
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; | |
int e; | |
while ((e = __getservbyport_r (((const struct sockaddr_in *) sa)->sin_port, | |
((flags & NI_DGRAM) | |
? "udp" : "tcp"), &ts, | |
tmpbuf.data, tmpbuf.length, &s))) | |
{ | |
if (e == ERANGE) | |
{ | |
if (!scratch_buffer_grow (&tmpbuf)) | |
return EAI_MEMORY; | |
} | |
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) |