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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. All advertising materials mentioning features or use of this software | |
must display the following acknowledgement with the name(s) of the | |
authors as specified in the copyright notice(s) substituted where | |
indicated: | |
This product includes software developed by <name(s)>, The Inner | |
Net, and other contributors. | |
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 <sys/types.h> | |
#include <sys/socket.h> | |
#include <netinet/in.h> | |
#include <sys/un.h> | |
#include <sys/utsname.h> | |
#include <netdb.h> | |
#include <errno.h> | |
#include <string.h> | |
#include <stdio.h> | |
#include <unistd.h> | |
#include <alloca.h> | |
#include <bits/libc-lock.h> | |
#include <arpa/inet.h> | |
#ifndef min | |
# define min(x,y) (((x) > (y)) ? (y) : (x)) | |
#endif /* min */ | |
static char * | |
internal_function | |
nrl_domainname (void) | |
{ | |
static char *domain = NULL; | |
static int first = 1; | |
if (first) | |
{ | |
__libc_lock_define_initialized (static, lock); | |
__libc_lock_lock (lock); | |
if (first) | |
{ | |
char *c; | |
struct hostent *h, th; | |
size_t tmpbuflen = 1024; | |
char *tmpbuf = alloca (tmpbuflen); | |
int herror; | |
first = 0; | |
while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h, | |
&herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (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)) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (tmpbuflen); | |
} | |
if ((c = strchr (tmpbuf, '.'))) | |
domain = __strdup (++c); | |
else | |
{ | |
/* We need to preserve the hostname. */ | |
const char *hstname = strdupa (tmpbuf); | |
while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen, | |
&h, &herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (tmpbuflen); | |
} | |
else | |
break; | |
} | |
if (h && (c = strchr(h->h_name, '.'))) | |
domain = __strdup (++c); | |
else | |
{ | |
struct in_addr in_addr; | |
in_addr.s_addr = htonl (0x7f000001); | |
while (__gethostbyaddr_r ((const char *) &in_addr, | |
sizeof (struct in_addr), | |
AF_INET, &th, tmpbuf, | |
tmpbuflen, &h, &herror)) | |
{ | |
if (herror == NETDB_INTERNAL && errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (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, | |
size_t hostlen, char *serv, size_t servlen, int flags) | |
{ | |
int serrno = errno; | |
int tmpbuflen = 1024; | |
int herrno; | |
char *tmpbuf = alloca (tmpbuflen); | |
struct hostent th; | |
if (sa == NULL) | |
return -1; | |
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 ((void *) &(((struct sockaddr_in6 *) sa)->sin6_addr), | |
sizeof(struct in6_addr), | |
AF_INET6, &th, tmpbuf, tmpbuflen, | |
&h, &herrno)) | |
{ | |
if (herrno == NETDB_INTERNAL) | |
{ | |
if (errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (tmpbuflen); | |
} | |
else | |
{ | |
__set_h_errno (herrno); | |
__set_errno (serrno); | |
return -1; | |
} | |
} | |
else | |
{ | |
break; | |
} | |
} | |
} | |
else | |
{ | |
while (__gethostbyaddr_r ((void *) &(((struct sockaddr_in *)sa)->sin_addr), | |
sizeof(struct in_addr), AF_INET, | |
&th, tmpbuf, tmpbuflen, | |
&h, &herrno)) | |
{ | |
if (errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = alloca (tmpbuflen); | |
} | |
else | |
{ | |
break; | |
} | |
} | |
} | |
} | |
if (h) | |
{ | |
if (flags & NI_NOFQDN) | |
{ | |
char *c; | |
if ((c = nrl_domainname ()) && (c = strstr(h->h_name, c)) | |
&& (c != h->h_name) && (*(--c) == '.')) | |
{ | |
strncpy (host, h->h_name, | |
min(hostlen, (size_t) (c - h->h_name))); | |
break; | |
} | |
} | |
strncpy (host, h->h_name, hostlen); | |
break; | |
} | |
} | |
if (flags & NI_NAMEREQD) | |
{ | |
__set_errno (serrno); | |
return -1; | |
} | |
else | |
{ | |
const char *c; | |
if (sa->sa_family == AF_INET6) | |
c = inet_ntop (AF_INET6, | |
(void *) &(((struct sockaddr_in6 *) sa)->sin6_addr), | |
host, hostlen); | |
else | |
c = inet_ntop (AF_INET, | |
(void *) &(((struct sockaddr_in *) sa)->sin_addr), | |
host, hostlen); | |
if (c == NULL) | |
{ | |
__set_errno (serrno); | |
return -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 -1; | |
} | |
strncpy (host, "localhost", hostlen); | |
break; | |
default: | |
return -1; | |
} | |
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 (((struct sockaddr_in *) sa)->sin_port, | |
((flags & NI_DGRAM) ? "udp" : "tcp"), | |
&ts, tmpbuf, tmpbuflen, &s)) | |
{ | |
if (herrno == NETDB_INTERNAL) | |
{ | |
if (errno == ERANGE) | |
{ | |
tmpbuflen *= 2; | |
tmpbuf = __alloca (tmpbuflen); | |
} | |
else | |
{ | |
__set_errno (serrno); | |
return -1; | |
} | |
} | |
else | |
{ | |
break; | |
} | |
} | |
if (s) | |
{ | |
strncpy (serv, s->s_name, servlen); | |
break; | |
} | |
} | |
snprintf (serv, servlen, "%d", | |
ntohs (((struct sockaddr_in *) sa)->sin_port)); | |
break; | |
case AF_LOCAL: | |
strncpy (serv, ((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; | |
} |