libjava/java/net/natInetAddress.cc

   1 // natInetAddress.cc
   2
   3 /* Copyright (C) 1998, 1999, 2000  Free Software Foundation
   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 USE_WINSOCK
  14
  15 #include <windows.h>
  16 #include <winsock.h>
  17
  18 #ifndef MAXHOSTNAMELEN
  19 #define MAXHOSTNAMELEN  64
  20 #endif /* MAXHOSTNAMELEN */
  21
  22 #else
  23
  24 #ifdef HAVE_UNISTD_H
  25 #include <unistd.h>
  26 #endif
  27 #include <string.h>
  28 #include <errno.h>
  29
  30 #include <sys/param.h>
  31 #include <sys/types.h>
  32 #ifdef HAVE_SYS_SOCKET_H
  33 #include <sys/socket.h>
  34 #endif
  35 #ifdef HAVE_NETINET_IN_H
  36 #include <netinet/in.h>
  37 #endif
  38 #ifdef HAVE_ARPA_INET_H
  39 #include <arpa/inet.h>
  40 #endif
  41 #ifdef HAVE_NETDB_H
  42 #include <netdb.h>
  43 #endif
  44
  45 #endif /* USE_WINSOCK */
  46
  47 #include <gcj/cni.h>
  48 #include <jvm.h>
  49 #include <java/net/InetAddress.h>
  50 #include <java/net/UnknownHostException.h>
  51 #include <java/lang/SecurityException.h>
  52
  53 #if defined(HAVE_UNAME) && ! defined(HAVE_GETHOSTNAME)
  54 #include <sys/utsname.h>
  55 #endif
  56
  57 #ifndef HAVE_GETHOSTNAME_DECL
  58 extern "C" int gethostname (char *name, int namelen);
  59 #endif
  60
  61 #ifdef DISABLE_JAVA_NET
  62
  63 jbyteArray
  64 java::net::InetAddress::aton (jstring)
  65 {
  66   return NULL;
  67 }
  68
  69 jint
  70 java::net::InetAddress::getFamily (jbyteArray bytes)
  71 {
  72   return 0;
  73 }
  74
  75 JArray<java::net::InetAddress*> *
  76 java::net::InetAddress::lookup (jstring, java::net::InetAddress *, jboolean)
  77 {
  78   return NULL;
  79 }
  80
  81 jstring
  82 java::net::InetAddress::getLocalHostname ()
  83 {
  84   return NULL;
  85 }
  86
  87 #else /* DISABLE_JAVA_NET */
  88
  89 jbyteArray
  90 java::net::InetAddress::aton (jstring host)
  91 {
  92   char *hostname;
  93   char buf[100];
  94   int len = JvGetStringUTFLength(host);
  95   if (len < 100)
  96     hostname = buf;
  97   else
  98     hostname = (char*) _Jv_AllocBytesChecked (len+1);
  99   JvGetStringUTFRegion (host, 0, host->length(), hostname);
 100   buf[len] = '\0';
 101   char* bytes = NULL;
 102   int blen = 0;
 103 #ifdef HAVE_INET_ATON
 104   struct in_addr laddr;
 105   if (inet_aton (hostname, &laddr))
 106     {
 107       bytes = (char*) &laddr;
 108       blen = 4;
 109     }
 110 #elif defined(HAVE_INET_ADDR)
 111 #if ! HAVE_IN_ADDR_T
 112   typedef jint in_addr_t;
 113 #endif
 114   in_addr_t laddr = inet_addr (hostname);
 115   if (laddr != (in_addr_t)(-1))
 116     {
 117       bytes = (char*) &laddr;
 118       blen = 4;
 119     }
 120 #endif
 121 #if defined (HAVE_INET_PTON) && defined (HAVE_INET6)
 122   char inet6_addr[16];
 123   if (len == 0 && inet_pton (AF_INET6, hostname, inet6_addr) > 0)
 124     {
 125       bytes = inet6_addr;
 126       blen = 16;
 127     }
 128 #endif
 129   if (blen == 0)
 130     return NULL;
 131   jbyteArray result = JvNewByteArray (blen);
 132   memcpy (elements (result), bytes, blen);
 133   return result;
 134 }
 135
 136 jint
 137 java::net::InetAddress::getFamily (jbyteArray bytes)
 138 {
 139   int len = bytes->length;
 140   if (len == 4)
 141     return AF_INET;
 142 #ifdef HAVE_INET6
 143   else if (len == 16)
 144     return AF_INET6;
 145 #endif /* HAVE_INET6 */
 146   else
 147     JvFail ("unrecognized size");
 148 }
 149
 150
 151 JArray<java::net::InetAddress*> *
 152 java::net::InetAddress::lookup (jstring host, java::net::InetAddress* iaddr,
 153                                 jboolean all)
 154 {
 155   struct hostent *hptr = NULL;
 156 #if defined (HAVE_GETHOSTBYNAME_R) || defined (HAVE_GETHOSTBYADDR_R)
 157   struct hostent hent_r;
 158 #if HAVE_STRUCT_HOSTENT_DATA
 159   struct hostent_data fixed_buffer, *buffer_r = &fixed_buffer;
 160 #else
 161 #if defined (__GLIBC__)
 162   // FIXME: in glibc, gethostbyname_r returns NETDB_INTERNAL to herr and
 163   // ERANGE to errno if the buffer size is too small, rather than what is
 164   // expected here. We work around this by setting a bigger buffer size and
 165   // hoping that it is big enough.
 166   char fixed_buffer[1024];
 167 #else
 168   char fixed_buffer[200];
 169 #endif
 170   char *buffer_r = fixed_buffer;
 171   int size_r = sizeof (fixed_buffer);
 172 #endif
 173 #endif
 174
 175   if (host != NULL)
 176     {
 177       char *hostname;
 178       char buf[100];
 179       int len = JvGetStringUTFLength(host);
 180       if (len < 100)
 181         hostname = buf;
 182       else
 183         hostname = (char*) _Jv_AllocBytesChecked (len+1);
 184       JvGetStringUTFRegion (host, 0, host->length(), hostname);
 185       buf[len] = '\0';
 186 #ifdef HAVE_GETHOSTBYNAME_R
 187       while (true)
 188         {
 189           int ok;
 190 #if HAVE_STRUCT_HOSTENT_DATA
 191           ok = ! gethostbyname_r (hostname, &hent_r, buffer_r);
 192 #else
 193           int herr = 0;
 194 #ifdef GETHOSTBYNAME_R_RETURNS_INT
 195           ok = ! gethostbyname_r (hostname, &hent_r, buffer_r, size_r,
 196                                   &hptr, &herr);
 197 #else
 198           hptr = gethostbyname_r (hostname, &hent_r, buffer_r, size_r, &herr);
 199           ok = hptr != NULL;
 200 #endif /* GETHOSTNAME_R_RETURNS_INT */
 201           if (! ok && herr == ERANGE)
 202             {
 203               size_r *= 2;
 204               buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 205             }
 206           else
 207 #endif /* HAVE_STRUCT_HOSTENT_DATA */
 208             break;
 209         }
 210 #else
 211       // FIXME: this is insufficient if some other piece of code calls
 212       // this gethostbyname.
 213       JvSynchronize sync (java::net::InetAddress::localhostAddress);
 214       hptr = gethostbyname (hostname);
 215 #endif /* HAVE_GETHOSTBYNAME_R */
 216     }
 217   else
 218     {
 219       jbyteArray bytes = iaddr->addr;
 220       char *chars = (char*) elements (bytes);
 221       int len = bytes->length;
 222       int type;
 223       char *val;
 224       if (len == 4)
 225         {
 226           val = chars;
 227           type = iaddr->family = AF_INET;
 228         }
 229 #ifdef HAVE_INET6
 230       else if (len == 16)
 231         {
 232           val = (char *) &chars;
 233           type = iaddr->family = AF_INET6;
 234         }
 235 #endif /* HAVE_INET6 */
 236       else
 237         JvFail ("unrecognized size");
 238
 239 #ifdef HAVE_GETHOSTBYADDR_R
 240       while (true)
 241         {
 242           int ok;
 243 #if HAVE_STRUCT_HOSTENT_DATA
 244           ok = ! gethostbyaddr_r (val, len, type, &hent_r, buffer_r);
 245 #else
 246           int herr = 0;
 247 #ifdef GETHOSTBYADDR_R_RETURNS_INT
 248           ok = ! gethostbyaddr_r (val, len, type, &hent_r,
 249                                   buffer_r, size_r, &hptr, &herr);
 250 #else
 251           hptr = gethostbyaddr_r (val, len, type, &hent_r,
 252                                   buffer_r, size_r, &herr);
 253           ok = hptr != NULL;
 254 #endif /* GETHOSTBYADDR_R_RETURNS_INT */
 255           if (! ok && herr == ERANGE)
 256             {
 257               size_r *= 2;
 258               buffer_r = (char *) _Jv_AllocBytesChecked (size_r);
 259             }
 260           else
 261 #endif /* HAVE_STRUCT_HOSTENT_DATA */
 262             break;
 263         }
 264 #else /* HAVE_GETHOSTBYADDR_R */
 265       // FIXME: this is insufficient if some other piece of code calls
 266       // this gethostbyaddr.
 267       JvSynchronize sync (java::net::InetAddress::localhostAddress);
 268       hptr = gethostbyaddr (val, len, type);
 269 #endif /* HAVE_GETHOSTBYADDR_R */
 270     }
 271   if (hptr != NULL)
 272     {
 273       if (!all)
 274         host = JvNewStringUTF (hptr->h_name);
 275       java::lang::SecurityException *ex = checkConnect (host);
 276       if (ex != NULL)
 277         {
 278           if (iaddr == NULL || iaddr->addr == NULL)
 279             throw ex;
 280           hptr = NULL;
 281         }
 282     }
 283   if (hptr == NULL)
 284     {
 285       if (iaddr != NULL && iaddr->addr != NULL)
 286         {
 287           iaddr->hostName = iaddr->getHostAddress();
 288           return NULL;
 289         }
 290       else
 291         throw new java::net::UnknownHostException(host);
 292     }
 293   int count;
 294   if (all)
 295     {
 296       char** ptr = hptr->h_addr_list;
 297       count = 0;
 298       while (*ptr++)  count++;
 299     }
 300   else
 301     count = 1;
 302   JArray<java::net::InetAddress*> *result;
 303   java::net::InetAddress** iaddrs;
 304   if (all)
 305     {
 306       result = java::net::InetAddress::allocArray (count);
 307       iaddrs = elements (result);
 308     }
 309   else
 310     {
 311       result = NULL;
 312       iaddrs = &iaddr;
 313     }
 314
 315   for (int i = 0;  i < count;  i++)
 316     {
 317       if (iaddrs[i] == NULL)
 318         iaddrs[i] = new java::net::InetAddress (NULL, NULL);
 319       if (iaddrs[i]->hostName == NULL)
 320         iaddrs[i]->hostName = host;
 321       if (iaddrs[i]->addr == NULL)
 322         {
 323           char *bytes = hptr->h_addr_list[i];
 324           iaddrs[i]->addr = JvNewByteArray (hptr->h_length);
 325           iaddrs[i]->family = getFamily (iaddrs[i]->addr);
 326           memcpy (elements (iaddrs[i]->addr), bytes, hptr->h_length);
 327         }
 328     }
 329   return result;
 330 }
 331
 332 jstring
 333 java::net::InetAddress::getLocalHostname ()
 334 {
 335   char *chars;
 336 #ifdef HAVE_GETHOSTNAME
 337   char buffer[MAXHOSTNAMELEN];
 338   if (gethostname (buffer, MAXHOSTNAMELEN))
 339     return NULL;
 340   chars = buffer;
 341 #elif HAVE_UNAME
 342   struct utsname stuff;
 343   if (uname (&stuff) != 0)
 344     return NULL;
 345   chars = stuff.nodename;
 346 #else
 347   return NULL;
 348 #endif
 349   // It is admittedly non-optimal to convert the hostname to Unicode
 350   // only to convert it back in getByName, but simplicity wins.  Note
 351   // that unless there is a SecurityManager, we only get called once
 352   // anyway, thanks to the InetAddress.localhost cache.
 353   return JvNewStringUTF (chars);
 354 }
 355
 356 #endif /* DISABLE_JAVA_NET */