1 /* 2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include <windows.h> 27 #include <winsock2.h> 28 #include <ctype.h> 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <malloc.h> 32 #include <sys/types.h> 33 #include <process.h> 34 35 #include "java_net_InetAddress.h" 36 #include "java_net_Inet4AddressImpl.h" 37 #include "net_util.h" 38 #include "icmp.h" 39 40 41 /* 42 * Returns true if hostname is in dotted IP address format. Note that this 43 * function performs a syntax check only. For each octet it just checks that 44 * the octet is at most 3 digits. 45 */ 46 jboolean isDottedIPAddress(const char *hostname, unsigned int *addrp) { 47 char *c = (char *)hostname; 48 int octets = 0; 49 unsigned int cur = 0; 50 int digit_cnt = 0; 51 52 while (*c) { 53 if (*c == '.') { 54 if (digit_cnt == 0) { 55 return JNI_FALSE; 56 } else { 57 if (octets < 4) { 58 addrp[octets++] = cur; 59 cur = 0; 60 digit_cnt = 0; 61 } else { 62 return JNI_FALSE; 63 } 64 } 65 c++; 66 continue; 67 } 68 69 if ((*c < '0') || (*c > '9')) { 70 return JNI_FALSE; 71 } 72 73 digit_cnt++; 74 if (digit_cnt > 3) { 75 return JNI_FALSE; 76 } 77 78 /* don't check if current octet > 255 */ 79 cur = cur*10 + (*c - '0'); 80 81 /* Move onto next character and check for EOF */ 82 c++; 83 if (*c == '\0') { 84 if (octets < 4) { 85 addrp[octets++] = cur; 86 } else { 87 return JNI_FALSE; 88 } 89 } 90 } 91 92 return (jboolean)(octets == 4); 93 } 94 95 /* 96 * Inet4AddressImpl 97 */ 98 99 /* 100 * Class: java_net_Inet4AddressImpl 101 * Method: getLocalHostName 102 * Signature: ()Ljava/lang/String; 103 */ 104 JNIEXPORT jstring JNICALL 105 Java_java_net_Inet4AddressImpl_getLocalHostName (JNIEnv *env, jobject this) { 106 char hostname[256]; 107 108 if (gethostname(hostname, sizeof hostname) == -1) { 109 strcpy(hostname, "localhost"); 110 } 111 return JNU_NewStringPlatform(env, hostname); 112 } 113 114 static jclass ni_iacls; 115 static jclass ni_ia4cls; 116 static jmethodID ni_ia4ctrID; 117 static int initialized = 0; 118 119 /* 120 * Find an internet address for a given hostname. Not this this 121 * code only works for addresses of type INET. The translation 122 * of %d.%d.%d.%d to an address (int) occurs in java now, so the 123 * String "host" shouldn't be a %d.%d.%d.%d string. The only 124 * exception should be when any of the %d are out of range and 125 * we fallback to a lookup. 126 * 127 * Class: java_net_Inet4AddressImpl 128 * Method: lookupAllHostAddr 129 * Signature: (Ljava/lang/String;)[[B 130 * 131 * This is almost shared code 132 */ 133 134 JNIEXPORT jobjectArray JNICALL 135 Java_java_net_Inet4AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this, 136 jstring host) { 137 const char *hostname; 138 struct hostent *hp; 139 unsigned int addr[4]; 140 141 jobjectArray ret = NULL; 142 143 if (!initialized) { 144 ni_iacls = (*env)->FindClass(env, "java/net/InetAddress"); 145 ni_iacls = (*env)->NewGlobalRef(env, ni_iacls); 146 ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address"); 147 ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls); 148 ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V"); 149 initialized = 1; 150 } 151 152 if (IS_NULL(host)) { 153 JNU_ThrowNullPointerException(env, "host argument"); 154 return NULL; 155 } 156 hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); 157 CHECK_NULL_RETURN(hostname, NULL); 158 159 /* 160 * The NT/2000 resolver tolerates a space in front of localhost. This 161 * is not consistent with other implementations of gethostbyname. 162 * In addition we must do a white space check on Solaris to avoid a 163 * bug whereby 0.0.0.0 is returned if any host name has a white space. 164 */ 165 if (isspace(hostname[0])) { 166 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 167 goto cleanupAndReturn; 168 } 169 170 /* 171 * If the format is x.x.x.x then don't use gethostbyname as Windows 172 * is unable to handle octets which are out of range. 173 */ 174 if (isDottedIPAddress(hostname, &addr[0])) { 175 unsigned int address; 176 jobject iaObj; 177 178 /* 179 * Are any of the octets out of range? 180 */ 181 if (addr[0] > 255 || addr[1] > 255 || addr[2] > 255 || addr[3] > 255) { 182 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 183 goto cleanupAndReturn; 184 } 185 186 /* 187 * Return an byte array with the populated address. 188 */ 189 address = (addr[3]<<24) & 0xff000000; 190 address |= (addr[2]<<16) & 0xff0000; 191 address |= (addr[1]<<8) & 0xff00; 192 address |= addr[0]; 193 194 ret = (*env)->NewObjectArray(env, 1, ni_iacls, NULL); 195 196 if (IS_NULL(ret)) { 197 goto cleanupAndReturn; 198 } 199 200 iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); 201 if (IS_NULL(iaObj)) { 202 ret = NULL; 203 goto cleanupAndReturn; 204 } 205 setInetAddress_addr(env, iaObj, ntohl(address)); 206 (*env)->SetObjectArrayElement(env, ret, 0, iaObj); 207 JNU_ReleaseStringPlatformChars(env, host, hostname); 208 return ret; 209 } 210 211 /* 212 * Perform the lookup 213 */ 214 if ((hp = gethostbyname((char*)hostname)) != NULL) { 215 struct in_addr **addrp = (struct in_addr **) hp->h_addr_list; 216 int len = sizeof(struct in_addr); 217 int i = 0; 218 219 while (*addrp != (struct in_addr *) 0) { 220 i++; 221 addrp++; 222 } 223 224 ret = (*env)->NewObjectArray(env, i, ni_iacls, NULL); 225 226 if (IS_NULL(ret)) { 227 goto cleanupAndReturn; 228 } 229 230 addrp = (struct in_addr **) hp->h_addr_list; 231 i = 0; 232 while (*addrp != (struct in_addr *) 0) { 233 jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); 234 if (IS_NULL(iaObj)) { 235 ret = NULL; 236 goto cleanupAndReturn; 237 } 238 setInetAddress_addr(env, iaObj, ntohl((*addrp)->s_addr)); 239 setInetAddress_hostName(env, iaObj, host); 240 (*env)->SetObjectArrayElement(env, ret, i, iaObj); 241 addrp++; 242 i++; 243 } 244 } else if (WSAGetLastError() == WSATRY_AGAIN) { 245 NET_ThrowByNameWithLastError(env, 246 JNU_JAVANETPKG "UnknownHostException", 247 hostname); 248 } else { 249 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 250 } 251 252 cleanupAndReturn: 253 JNU_ReleaseStringPlatformChars(env, host, hostname); 254 return ret; 255 } 256 257 /* 258 * Class: java_net_Inet4AddressImpl 259 * Method: getHostByAddr 260 * Signature: (I)Ljava/lang/String; 261 */ 262 JNIEXPORT jstring JNICALL 263 Java_java_net_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, 264 jbyteArray addrArray) { 265 struct hostent *hp; 266 jbyte caddr[4]; 267 jint addr; 268 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 269 addr = ((caddr[0]<<24) & 0xff000000); 270 addr |= ((caddr[1] <<16) & 0xff0000); 271 addr |= ((caddr[2] <<8) & 0xff00); 272 addr |= (caddr[3] & 0xff); 273 addr = htonl(addr); 274 275 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET); 276 if (hp == NULL) { 277 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 278 return NULL; 279 } 280 if (hp->h_name == NULL) { /* Deal with bug in Windows XP */ 281 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 282 return NULL; 283 } 284 return JNU_NewStringPlatform(env, hp->h_name); 285 } 286 287 288 /** 289 * ping implementation. 290 * Send a ICMP_ECHO_REQUEST packet every second until either the timeout 291 * expires or a answer is received. 292 * Returns true is an ECHO_REPLY is received, otherwise, false. 293 */ 294 static jboolean 295 ping4(JNIEnv *env, jint fd, struct sockaddr_in* him, jint timeout, 296 struct sockaddr_in* netif, jint ttl) { 297 jint size; 298 jint n, len, hlen1, icmplen; 299 char sendbuf[1500]; 300 char recvbuf[1500]; 301 struct icmp *icmp; 302 struct ip *ip; 303 WSAEVENT hEvent; 304 struct sockaddr sa_recv; 305 jint tmout2; 306 u_short pid, seq; 307 int read_rv = 0; 308 309 /* Initialize the sequence number to a suitable random number and 310 shift right one place to allow sufficient room for increamenting. */ 311 seq = ((unsigned short)rand()) >> 1; 312 313 /* icmp_id is a 16 bit data type, therefore down cast the pid */ 314 pid = (u_short) _getpid(); 315 size = 60*1024; 316 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(size)); 317 /** 318 * A TTL was specified, let's set the socket option. 319 */ 320 if (ttl > 0) { 321 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *) &ttl, sizeof(ttl)); 322 } 323 324 /** 325 * A network interface was specified, let's bind to it. 326 */ 327 if (netif != NULL) { 328 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 329 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 330 closesocket(fd); 331 return JNI_FALSE; 332 } 333 } 334 335 /** 336 * Let's make the socket non blocking 337 */ 338 hEvent = WSACreateEvent(); 339 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 340 341 /** 342 * send 1 ICMP REQUEST every second until either we get a valid reply 343 * or the timeout expired. 344 */ 345 do { 346 /** 347 * construct the ICMP header 348 */ 349 memset(sendbuf, 0, 1500); 350 icmp = (struct icmp *) sendbuf; 351 icmp->icmp_type = ICMP_ECHO; 352 icmp->icmp_code = 0; 353 icmp->icmp_id = htons(pid); 354 icmp->icmp_seq = htons(seq); 355 /** 356 * checksum has to be set to zero before we can calculate the 357 * real checksum! 358 */ 359 icmp->icmp_cksum = 0; 360 icmp->icmp_cksum = in_cksum((u_short *)icmp, 64); 361 /** 362 * Ping! 363 */ 364 n = sendto(fd, sendbuf, 64, 0, (struct sockaddr *)him, 365 sizeof(struct sockaddr)); 366 if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) { 367 NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet"); 368 closesocket(fd); 369 WSACloseEvent(hEvent); 370 return JNI_FALSE; 371 } 372 373 /* 374 * wait for 1 second at most 375 */ 376 tmout2 = timeout > 1000 ? 1000 : timeout; 377 do { 378 tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2); 379 if (tmout2 >= 0) { 380 len = sizeof(sa_recv); 381 n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, &sa_recv, &len); 382 ip = (struct ip*) recvbuf; 383 hlen1 = (ip->ip_hl) << 2; 384 icmp = (struct icmp *) (recvbuf + hlen1); 385 icmplen = n - hlen1; 386 /** 387 * Is that a proper ICMP reply? 388 */ 389 if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY && 390 (ntohs(icmp->icmp_seq) == seq) && (ntohs(icmp->icmp_id) == pid)) { 391 closesocket(fd); 392 WSACloseEvent(hEvent); 393 return JNI_TRUE; 394 } 395 } 396 } while (tmout2 > 0); 397 timeout -= 1000; 398 seq++; 399 } while (timeout > 0); 400 closesocket(fd); 401 WSACloseEvent(hEvent); 402 return JNI_FALSE; 403 } 404 405 /* 406 * Class: java_net_Inet4AddressImpl 407 * Method: isReachable0 408 * Signature: ([bI[bI)Z 409 */ 410 JNIEXPORT jboolean JNICALL 411 Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this, 412 jbyteArray addrArray, 413 jint timeout, 414 jbyteArray ifArray, 415 jint ttl) { 416 jint addr; 417 jbyte caddr[4]; 418 jint fd; 419 struct sockaddr_in him; 420 struct sockaddr_in* netif = NULL; 421 struct sockaddr_in inf; 422 int len = 0; 423 WSAEVENT hEvent; 424 int connect_rv = -1; 425 int sz; 426 427 /** 428 * Convert IP address from byte array to integer 429 */ 430 sz = (*env)->GetArrayLength(env, addrArray); 431 if (sz != 4) { 432 return JNI_FALSE; 433 } 434 memset((char *) &him, 0, sizeof(him)); 435 memset((char *) caddr, 0, sizeof(caddr)); 436 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 437 addr = ((caddr[0]<<24) & 0xff000000); 438 addr |= ((caddr[1] <<16) & 0xff0000); 439 addr |= ((caddr[2] <<8) & 0xff00); 440 addr |= (caddr[3] & 0xff); 441 addr = htonl(addr); 442 /** 443 * Socket address 444 */ 445 him.sin_addr.s_addr = addr; 446 him.sin_family = AF_INET; 447 len = sizeof(him); 448 449 /** 450 * If a network interface was specified, let's convert its address 451 * as well. 452 */ 453 if (!(IS_NULL(ifArray))) { 454 memset((char *) caddr, 0, sizeof(caddr)); 455 (*env)->GetByteArrayRegion(env, ifArray, 0, 4, caddr); 456 addr = ((caddr[0]<<24) & 0xff000000); 457 addr |= ((caddr[1] <<16) & 0xff0000); 458 addr |= ((caddr[2] <<8) & 0xff00); 459 addr |= (caddr[3] & 0xff); 460 addr = htonl(addr); 461 inf.sin_addr.s_addr = addr; 462 inf.sin_family = AF_INET; 463 inf.sin_port = 0; 464 netif = &inf; 465 } 466 467 #if 0 468 /* 469 * Windows implementation of ICMP & RAW sockets is too unreliable for now. 470 * Therefore it's best not to try it at all and rely only on TCP 471 * We may revisit and enable this code in the future. 472 */ 473 474 /* 475 * Let's try to create a RAW socket to send ICMP packets 476 * This usually requires "root" privileges, so it's likely to fail. 477 */ 478 fd = NET_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 479 if (fd != -1) { 480 /* 481 * It didn't fail, so we can use ICMP_ECHO requests. 482 */ 483 return ping4(env, fd, &him, timeout, netif, ttl); 484 } 485 #endif 486 487 /* 488 * Can't create a raw socket, so let's try a TCP socket 489 */ 490 fd = NET_Socket(AF_INET, SOCK_STREAM, 0); 491 if (fd == JVM_IO_ERR) { 492 /* note: if you run out of fds, you may not be able to load 493 * the exception class, and get a NoClassDefFoundError 494 * instead. 495 */ 496 NET_ThrowNew(env, WSAGetLastError(), "Can't create socket"); 497 return JNI_FALSE; 498 } 499 if (ttl > 0) { 500 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *)&ttl, sizeof(ttl)); 501 } 502 /* 503 * A network interface was specified, so let's bind to it. 504 */ 505 if (netif != NULL) { 506 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 507 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 508 closesocket(fd); 509 return JNI_FALSE; 510 } 511 } 512 513 /* 514 * Make the socket non blocking so we can use select/poll. 515 */ 516 hEvent = WSACreateEvent(); 517 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 518 519 /* no need to use NET_Connect as non-blocking */ 520 him.sin_port = htons(7); /* Echo */ 521 connect_rv = connect(fd, (struct sockaddr *)&him, len); 522 523 /** 524 * connection established or refused immediately, either way it means 525 * we were able to reach the host! 526 */ 527 if (connect_rv == 0 || WSAGetLastError() == WSAECONNREFUSED) { 528 WSACloseEvent(hEvent); 529 closesocket(fd); 530 return JNI_TRUE; 531 } else { 532 int optlen; 533 534 switch (WSAGetLastError()) { 535 case WSAEHOSTUNREACH: /* Host Unreachable */ 536 case WSAENETUNREACH: /* Network Unreachable */ 537 case WSAENETDOWN: /* Network is down */ 538 case WSAEPFNOSUPPORT: /* Protocol Family unsupported */ 539 WSACloseEvent(hEvent); 540 closesocket(fd); 541 return JNI_FALSE; 542 } 543 544 if (WSAGetLastError() != WSAEWOULDBLOCK) { 545 NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException", 546 "connect failed"); 547 WSACloseEvent(hEvent); 548 closesocket(fd); 549 return JNI_FALSE; 550 } 551 552 timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout); 553 554 /* has connection been established */ 555 556 if (timeout >= 0) { 557 optlen = sizeof(connect_rv); 558 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, 559 &optlen) <0) { 560 connect_rv = WSAGetLastError(); 561 } 562 563 if (connect_rv == 0 || connect_rv == WSAECONNREFUSED) { 564 WSACloseEvent(hEvent); 565 closesocket(fd); 566 return JNI_TRUE; 567 } 568 } 569 } 570 WSACloseEvent(hEvent); 571 closesocket(fd); 572 return JNI_FALSE; 573 } --- EOF ---