53dfe2970a
* java/net/natInetAddress.cc (aton): Fix typos.
(lookup): Use a bigger buffer size for gethostbyname_r on all
versions of glibc. Updated FIXME comment explaining this.
Modified while loops to not set herr = ERANGE to work around glibc
problems. Use user specified hostname in InetAddress result when
available (consistent with JDK).
From-SVN: r27484
283 lines
6.6 KiB
C++
283 lines
6.6 KiB
C++
// natInetAddress.cc
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/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <string.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#include <cni.h>
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#include <jvm.h>
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#include <java/net/InetAddress.h>
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#include <java/net/UnknownHostException.h>
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#include <java/lang/SecurityException.h>
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#if defined(HAVE_UNAME) && ! defined(HAVE_GETHOSTNAME)
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#include <sys/utsname.h>
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#endif
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#ifndef HAVE_GETHOSTNAME_DECL
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extern "C" int gethostname (char *name, int namelen);
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#endif
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jbyteArray
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java::net::InetAddress::aton (jstring host)
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{
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char *hostname;
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char buf[100];
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int len = JvGetStringUTFLength(host);
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if (len < 100)
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hostname = buf;
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else
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hostname = (char*) _Jv_AllocBytesChecked (len+1);
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JvGetStringUTFRegion (host, 0, host->length(), hostname);
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buf[len] = '\0';
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char* bytes = NULL;
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int blen = 0;
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#ifdef HAVE_INET_ATON
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struct in_addr laddr;
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if (inet_aton (hostname, &laddr))
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{
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bytes = (char*) &laddr;
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blen = 4;
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}
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#elif defined(HAVE_INET_ADDR)
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in_addr_t laddr = inet_addr (hostname);
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if (laddr != (in_addr_t)(-1))
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{
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bytes = (char*) &laddr;
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blen = 4;
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}
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#endif
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#ifdef HAVE_INET_PTON
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char inet6_addr[16];
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if (len == 0 && inet_pton (AF_INET6, hostname, inet6_addr) > 0)
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{
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bytes = inet6_addr;
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blen = 16;
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}
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#endif
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if (blen == 0)
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return NULL;
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jbyteArray result = JvNewByteArray (blen);
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memcpy (elements (result), bytes, blen);
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return result;
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}
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JArray<java::net::InetAddress*> *
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java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
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jboolean all)
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{
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struct hostent *hptr = NULL;
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#if defined (HAVE_GETHOSTBYNAME_R) || defined (HAVE_GETHOSTBYADDR_R)
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struct hostent hent_r;
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#if defined (__GLIBC__)
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// FIXME: in glibc, gethostbyname_r returns NETDB_INTERNAL to herr and
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// ERANGE to errno if the buffer size is too small, rather than what is
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// expected here. We work around this by setting a bigger buffer size and
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// hoping that it is big enough.
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char fixed_buffer[1024];
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#else
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char fixed_buffer[200];
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#endif
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char *buffer_r = fixed_buffer;
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int size_r = sizeof (fixed_buffer);
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#endif
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if (host != NULL)
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{
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char *hostname;
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char buf[100];
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int len = JvGetStringUTFLength(host);
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if (len < 100)
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hostname = buf;
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else
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hostname = (char*) _Jv_AllocBytesChecked (len+1);
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JvGetStringUTFRegion (host, 0, host->length(), hostname);
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buf[len] = '\0';
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#ifdef HAVE_GETHOSTBYNAME_R
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int herr = 0;
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while (true)
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{
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int ok;
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#ifdef GETHOSTBYNAME_R_RETURNS_INT
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ok = ! gethostbyname_r (hostname, &hent_r, buffer_r, size_r,
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&hptr, &herr);
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#else
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hptr = gethostbyname_r (hostname, &hent_r, buffer_r, size_r, &herr);
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ok = hptr != NULL;
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#endif /* GETHOSTNAME_R_RETURNS_INT */
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if (! ok && herr == ERANGE)
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{
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size_r *= 2;
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buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
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}
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else
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break;
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}
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#else
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// FIXME: this is insufficient if some other piece of code calls
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// this gethostbyname.
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JvSynchronize sync (java::net::InetAddress::localhostAddress);
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hptr = gethostbyname (hostname);
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#endif /* HAVE_GETHOSTBYNAME_R */
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}
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else
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{
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jbyteArray bytes = iaddr->address;
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char *chars = (char*) elements (bytes);
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int len = bytes->length;
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int type;
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char *val;
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if (len == 4)
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{
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val = chars;
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type = AF_INET;
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}
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#ifdef HAVE_INET6
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else if (len == 16)
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{
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val = (char *) &chars;
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type = AF_INET6;
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}
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#endif /* HAVE_INET6 */
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else
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JvFail ("unrecognized size");
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#ifdef HAVE_GETHOSTBYADDR_R
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int herr = 0;
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while (true)
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{
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int ok;
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#ifdef GETHOSTBYADDR_R_RETURNS_INT
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ok = ! gethostbyaddr_r (val, len, type, &hent_r,
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buffer_r, size_r, &hptr, &herr);
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#else
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hptr = gethostbyaddr_r (val, len, type, &hent_r,
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buffer_r, size_r, &herr);
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ok = hptr != NULL;
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#endif /* GETHOSTBYADDR_R_RETURNS_INT */
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if (! ok && herr == ERANGE)
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{
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size_r *= 2;
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buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
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}
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else
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break;
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}
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#else /* HAVE_GETHOSTBYADDR_R */
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// FIXME: this is insufficient if some other piece of code calls
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// this gethostbyaddr.
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JvSynchronize sync (java::net::InetAddress::localhostAddress);
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hptr = gethostbyaddr (val, len, type);
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#endif /* HAVE_GETHOSTBYADDR_R */
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}
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if (hptr != NULL)
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{
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if (host == NULL)
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host = JvNewStringUTF (hptr->h_name);
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java::lang::SecurityException *ex = checkConnect (host);
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if (ex != NULL)
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{
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if (iaddr == NULL || iaddr->address == NULL)
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JvThrow (ex);
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hptr = NULL;
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}
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}
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if (hptr == NULL)
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{
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if (iaddr != NULL && iaddr->address != NULL)
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{
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iaddr->hostname = iaddr->getHostAddress();
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return NULL;
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}
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else
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JvThrow (new java::net::UnknownHostException(host));
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}
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int count;
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if (all)
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{
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char** ptr = hptr->h_addr_list;
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count = 0;
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while (*ptr++) count++;
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}
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else
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count = 1;
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JArray<java::net::InetAddress*> *result;
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java::net::InetAddress** iaddrs;
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if (all)
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{
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result = java::net::InetAddress::allocArray (count);
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iaddrs = elements (result);
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}
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else
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{
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result = NULL;
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iaddrs = &iaddr;
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}
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for (int i = 0; i < count; i++)
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{
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if (iaddrs[i] == NULL)
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iaddrs[i] = new java::net::InetAddress (NULL, NULL);
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iaddrs[i]->hostname = host;
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if (iaddrs[i]->address == NULL)
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{
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char *bytes = hptr->h_addr_list[i];
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iaddrs[i]->address = JvNewByteArray (hptr->h_length);
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memcpy (elements (iaddrs[i]->address), bytes, hptr->h_length);
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}
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}
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return result;
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}
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jstring
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java::net::InetAddress::getLocalHostname ()
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{
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char *chars;
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#ifdef HAVE_GETHOSTNAME
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char buffer[MAXHOSTNAMELEN];
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if (gethostname (buffer, MAXHOSTNAMELEN))
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return NULL;
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chars = buffer;
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#elif HAVE_UNAME
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struct utsname stuff;
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if (uname (&stuff) != 0)
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return NULL:
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chars = stuff.nodename;
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#else
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return NULL;
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#endif
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// It is admittedly non-optimal to convert the hostname to Unicode
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// only to convert it back in getByName, but simplicity wins. Note
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// that unless there is a SecurityManager, we only get called once
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// anyway, thanks to the InetAddress.localhost cache.
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return JvNewStringUTF (chars);
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}
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