libjava/java/net/natInetAddress.cc

   1 // natClass.cc - Implementation of java.lang.Class native methods.
   2
   3 /* Copyright (C) 1998, 1999  Cygnus Solutions
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12
  13 #ifdef HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16 #include <string.h>
  17 #include <errno.h>
  18
  19 #include <sys/param.h>
  20 #include <sys/types.h>
  21 #ifdef HAVE_SYS_SOCKET_H
  22 #include <sys/socket.h>
  23 #endif
  24 #ifdef HAVE_NETINET_IN_H
  25 #include <netinet/in.h>
  26 #endif
  27 #ifdef HAVE_ARPA_INET_H
  28 #include <arpa/inet.h>
  29 #endif
  30 #ifdef HAVE_NETDB_H
  31 #include <netdb.h>
  32 #endif
  33
  34 #include <cni.h>
  35 #include <jvm.h>
  36 #include <java/net/InetAddress.h>
  37 #include <java/net/UnknownHostException.h>
  38 #include <java/lang/SecurityException.h>
  39
  40 #if defined(HAVE_UNAME) && ! defined(HAVE_GETHOSTNAME)
  41 #include <sys/utsname.h>
  42 #endif
  43
  44 #ifndef HAVE_GETHOSTNAME_DECL
  45 extern "C" int gethostname (char *name, int namelen);
  46 #endif
  47
  48 jbyteArray
  49 java::net::InetAddress::aton (jstring host)
  50 {
  51   char *hostname;
  52   char buf[100];
  53   int len = JvGetStringUTFLength(host);
  54   if (len < 100)
  55     hostname = buf;
  56   else
  57     hostname = (char*) _Jv_AllocBytesChecked (len+1);
  58   JvGetStringUTFRegion (host, 0, host->length(), hostname);
  59   buf[len] = '\0';
  60   char* bytes = NULL;
  61   int blen = 0;
  62 #ifdef HAVE_INET_ATON
  63   struct in_addr laddr;
  64   if (inet_aton (hostname, &laddr))
  65     {
  66       bytes = (char*) &laddr;
  67       len = 4;
  68     }
  69 #elif defined(HAVE_INET_ADDR)
  70   in_addr_t laddr = inet_addr (hostname);
  71   if (laddr != (in_addr_t)(-1))
  72     {
  73       bytes = (char*) &laddr;
  74       len = 4;
  75     }
  76 #endif
  77 #ifdef HAVE_INET_PTON
  78   char inet6_addr[16];
  79   if (len == 0 && inet_pton (AF_INET6, hostname, inet6_addr) > 0)
  80     {
  81       bytes = inet6_addr;
  82       len = 16;
  83     }
  84 #endif
  85   if (blen == 0)
  86     return NULL;
  87   jbyteArray result = JvNewByteArray (len);
  88   memcpy (elements (result), bytes, blen);
  89   return result;
  90 }
  91
  92
  93 JArray<java::net::InetAddress*> *
  94 java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
  95                                 jboolean all)
  96 {
  97   struct hostent *hptr = NULL;
  98 #if defined (HAVE_GETHOSTBYNAME_R) || defined (HAVE_GETHOSTBYADDR_R)
  99   struct hostent hent_r;
 100   char fixed_buffer[200];
 101   char *buffer_r = fixed_buffer;
 102   int size_r = sizeof (fixed_buffer);
 103 #endif
 104
 105   if (host != NULL)
 106     {
 107       char *hostname;
 108       char buf[100];
 109       int len = JvGetStringUTFLength(host);
 110       if (len < 100)
 111         hostname = buf;
 112       else
 113         hostname = (char*) _Jv_AllocBytesChecked (len+1);
 114       JvGetStringUTFRegion (host, 0, host->length(), hostname);
 115       buf[len] = '\0';
 116 #ifdef HAVE_GETHOSTBYNAME_R
 117       int herr = ERANGE;
 118       while (hptr == NULL && herr == ERANGE)
 119         {
 120           int ok;
 121 #ifdef GETHOSTBYNAME_R_RETURNS_INT
 122           ok = ! gethostbyname_r (hostname, &hent_r, buffer_r, size_r,
 123                                   &hptr, &herr);
 124 #else
 125           hptr = gethostbyname_r (hostname, &hent_r, buffer_r, size_r, &herr);
 126           ok = hptr != NULL;
 127 #endif /* GETHOSTNAME_R_RETURNS_INT */
 128           if (! ok && herr == ERANGE)
 129             {
 130               size_r *= 2;
 131               buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 132             }
 133         }
 134 #else
 135       // FIXME: this is insufficient if some other piece of code calls
 136       // this gethostbyname.
 137       JvSynchronize sync (java::net::InetAddress::localhostAddress);
 138       hptr = gethostbyname (hostname);
 139 #endif /* HAVE_GETHOSTBYNAME_R */
 140     }
 141   else
 142     {
 143       jbyteArray bytes = iaddr->address;
 144       char *chars = (char*) elements (bytes);
 145       int len = bytes->length;
 146       int type;
 147       char *val;
 148       if (len == 4)
 149         {
 150           val = chars;
 151           type = AF_INET;
 152         }
 153 #ifdef HAVE_INET6
 154       else if (len == 16)
 155         {
 156           val = (char *) &chars;
 157           type = AF_INET16;
 158         }
 159 #endif /* HAVE_INET6 */
 160       else
 161         JvFail ("unrecognized size");
 162
 163 #ifdef HAVE_GETHOSTBYADDR_R
 164       int herr = ERANGE;
 165       while (hptr == NULL && herr == ERANGE)
 166         {
 167           int ok;
 168 #ifdef GETHOSTBYADDR_R_RETURNS_INT
 169           ok = ! gethostbyaddr_r (val, len, type, &hent_r,
 170                                   buffer_r, size_r, &hptr, &herr);
 171 #else
 172           hptr = gethostbyaddr_r (val, len, type, &hent_r,
 173                                   buffer_r, size_r, &herr);
 174           ok = hptr != NULL;
 175 #endif /* GETHOSTBYADDR_R_RETURNS_INT */
 176           if (! ok && herr == ERANGE)
 177             {
 178               size_r *= 2;
 179               buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 180             }
 181         }
 182 #else /* HAVE_GETHOSTBYADDR_R */
 183       // FIXME: this is insufficient if some other piece of code calls
 184       // this gethostbyaddr.
 185       JvSynchronize sync (java::net::InetAddress::localhostAddress);
 186       hptr = gethostbyaddr (val, len, type);
 187 #endif /* HAVE_GETHOSTBYADDR_R */
 188     }
 189   if (hptr != NULL)
 190     {
 191       host = JvNewStringUTF (hptr->h_name);
 192       java::lang::SecurityException *ex = checkConnect (host);
 193       if (ex != NULL)
 194         {
 195           if (iaddr == NULL || iaddr->address == NULL)
 196             JvThrow (ex);
 197           hptr = NULL;
 198         }
 199     }
 200   if (hptr == NULL)
 201     {
 202       if (iaddr != NULL && iaddr->address != NULL)
 203         {
 204           iaddr->hostname = iaddr->getHostAddress();
 205           return NULL;
 206         }
 207       else
 208         JvThrow (new java::net::UnknownHostException(host));
 209     }
 210   int count;
 211   if (all)
 212     {
 213       char** ptr = hptr->h_addr_list;
 214       count = 0;
 215       while (*ptr++)  count++;
 216     }
 217   else
 218     count = 1;
 219   JArray<java::net::InetAddress*> *result;
 220   java::net::InetAddress** iaddrs;
 221   if (all)
 222     {
 223       result = java::net::InetAddress::allocArray (count);
 224       iaddrs = elements (result);
 225     }
 226   else
 227     {
 228       result = NULL;
 229       iaddrs = &iaddr;
 230     }
 231
 232   for (int i = 0;  i < count;  i++)
 233     {
 234       if (iaddrs[i] == NULL)
 235         iaddrs[i] = new java::net::InetAddress (NULL, NULL);
 236       if (i == 0)
 237         iaddrs[0]->hostname = host;
 238       if (iaddrs[i]->address == NULL)
 239         {
 240           char *bytes = hptr->h_addr_list[i];
 241           iaddr->address = JvNewByteArray (hptr->h_length);
 242           memcpy (elements (iaddr->address), bytes, hptr->h_length);
 243         }
 244     }
 245   return result;
 246 }
 247
 248 jstring
 249 java::net::InetAddress::getLocalHostname ()
 250 {
 251   char *chars;
 252 #ifdef HAVE_GETHOSTNAME
 253   char buffer[MAXHOSTNAMELEN];
 254   if (gethostname (buffer, MAXHOSTNAMELEN))
 255     return NULL;
 256   chars = buffer;
 257 #elif HAVE_UNAME
 258   struct utsname stuff;
 259   if (uname (&stuff) != 0)
 260     return NULL:
 261   chars = stuff.nodename;
 262 #else
 263   return NULL;
 264 #endif
 265   // It is admittedly non-optimal to convert the hostname to Unicode
 266   // only to convert it back in getByName, but simplicity wins.  Note
 267   // that unless there is a SecurityManager, we only get called once
 268   // anyway, thanks to the InetAddress.localhost cache.
 269   return JvNewStringUTF (chars);
 270 }