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 CHECK_NULL_RETURN(ni_iacls, NULL); 146 ni_iacls = (*env)->NewGlobalRef(env, ni_iacls); 147 CHECK_NULL_RETURN(ni_iacls, NULL); 148 ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address"); 149 CHECK_NULL_RETURN(ni_ia4cls, NULL); 150 ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls); 151 CHECK_NULL_RETURN(ni_ia4cls, NULL); 152 ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V"); 153 CHECK_NULL_RETURN(ni_ia4ctrID, NULL); 154 initialized = 1; 155 } 156 157 if (IS_NULL(host)) { 158 JNU_ThrowNullPointerException(env, "host argument"); 159 return NULL; 160 } 161 hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); 162 CHECK_NULL_RETURN(hostname, NULL); 163 164 /* 165 * The NT/2000 resolver tolerates a space in front of localhost. This 166 * is not consistent with other implementations of gethostbyname. 167 * In addition we must do a white space check on Solaris to avoid a 168 * bug whereby 0.0.0.0 is returned if any host name has a white space. 169 */ 170 if (isspace(hostname[0])) { 171 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 172 goto cleanupAndReturn; 173 } 174 175 /* 176 * If the format is x.x.x.x then don't use gethostbyname as Windows 177 * is unable to handle octets which are out of range. 178 */ 179 if (isDottedIPAddress(hostname, &addr[0])) { 180 unsigned int address; 181 jobject iaObj; 182 183 /* 184 * Are any of the octets out of range? 185 */ 186 if (addr[0] > 255 || addr[1] > 255 || addr[2] > 255 || addr[3] > 255) { 187 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 188 goto cleanupAndReturn; 189 } 190 191 /* 192 * Return an byte array with the populated address. 193 */ 194 address = (addr[3]<<24) & 0xff000000; 195 address |= (addr[2]<<16) & 0xff0000; 196 address |= (addr[1]<<8) & 0xff00; 197 address |= addr[0]; 198 199 ret = (*env)->NewObjectArray(env, 1, ni_iacls, NULL); 200 201 if (IS_NULL(ret)) { 202 goto cleanupAndReturn; 203 } 204 205 iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); 206 if (IS_NULL(iaObj)) { 207 ret = NULL; 208 goto cleanupAndReturn; 209 } 210 setInetAddress_addr(env, iaObj, ntohl(address)); 211 (*env)->SetObjectArrayElement(env, ret, 0, iaObj); 212 JNU_ReleaseStringPlatformChars(env, host, hostname); 213 return ret; 214 } 215 216 /* 217 * Perform the lookup 218 */ 219 if ((hp = gethostbyname((char*)hostname)) != NULL) { 220 struct in_addr **addrp = (struct in_addr **) hp->h_addr_list; 221 int len = sizeof(struct in_addr); 222 int i = 0; 223 224 while (*addrp != (struct in_addr *) 0) { 225 i++; 226 addrp++; 227 } 228 229 ret = (*env)->NewObjectArray(env, i, ni_iacls, NULL); 230 231 if (IS_NULL(ret)) { 232 goto cleanupAndReturn; 233 } 234 235 addrp = (struct in_addr **) hp->h_addr_list; 236 i = 0; 237 while (*addrp != (struct in_addr *) 0) { 238 jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); 239 if (IS_NULL(iaObj)) { 240 ret = NULL; 241 goto cleanupAndReturn; 242 } 243 setInetAddress_addr(env, iaObj, ntohl((*addrp)->s_addr)); 244 setInetAddress_hostName(env, iaObj, host); 245 (*env)->SetObjectArrayElement(env, ret, i, iaObj); 246 addrp++; 247 i++; 248 } 249 } else if (WSAGetLastError() == WSATRY_AGAIN) { 250 NET_ThrowByNameWithLastError(env, 251 JNU_JAVANETPKG "UnknownHostException", 252 hostname); 253 } else { 254 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 255 } 256 257 cleanupAndReturn: 258 JNU_ReleaseStringPlatformChars(env, host, hostname); 259 return ret; 260 } 261 262 /* 263 * Class: java_net_Inet4AddressImpl 264 * Method: getHostByAddr 265 * Signature: (I)Ljava/lang/String; 266 */ 267 JNIEXPORT jstring JNICALL 268 Java_java_net_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, 269 jbyteArray addrArray) { 270 struct hostent *hp; 271 jbyte caddr[4]; 272 jint addr; 273 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 274 addr = ((caddr[0]<<24) & 0xff000000); 275 addr |= ((caddr[1] <<16) & 0xff0000); 276 addr |= ((caddr[2] <<8) & 0xff00); 277 addr |= (caddr[3] & 0xff); 278 addr = htonl(addr); 279 280 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET); 281 if (hp == NULL) { 282 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 283 return NULL; 284 } 285 if (hp->h_name == NULL) { /* Deal with bug in Windows XP */ 286 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 287 return NULL; 288 } 289 return JNU_NewStringPlatform(env, hp->h_name); 290 } 291 292 293 /** 294 * ping implementation. 295 * Send a ICMP_ECHO_REQUEST packet every second until either the timeout 296 * expires or a answer is received. 297 * Returns true is an ECHO_REPLY is received, otherwise, false. 298 */ 299 static jboolean 300 ping4(JNIEnv *env, jint fd, struct sockaddr_in* him, jint timeout, 301 struct sockaddr_in* netif, jint ttl) { 302 jint size; 303 jint n, len, hlen1, icmplen; 304 char sendbuf[1500]; 305 char recvbuf[1500]; 306 struct icmp *icmp; 307 struct ip *ip; 308 WSAEVENT hEvent; 309 struct sockaddr sa_recv; 310 jint tmout2; 311 u_short pid, seq; 312 int read_rv = 0; 313 314 /* Initialize the sequence number to a suitable random number and 315 shift right one place to allow sufficient room for increamenting. */ 316 seq = ((unsigned short)rand()) >> 1; 317 318 /* icmp_id is a 16 bit data type, therefore down cast the pid */ 319 pid = (u_short) _getpid(); 320 size = 60*1024; 321 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(size)); 322 /** 323 * A TTL was specified, let's set the socket option. 324 */ 325 if (ttl > 0) { 326 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *) &ttl, sizeof(ttl)); 327 } 328 329 /** 330 * A network interface was specified, let's bind to it. 331 */ 332 if (netif != NULL) { 333 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 334 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 335 closesocket(fd); 336 return JNI_FALSE; 337 } 338 } 339 340 /** 341 * Let's make the socket non blocking 342 */ 343 hEvent = WSACreateEvent(); 344 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 345 346 /** 347 * send 1 ICMP REQUEST every second until either we get a valid reply 348 * or the timeout expired. 349 */ 350 do { 351 /** 352 * construct the ICMP header 353 */ 354 memset(sendbuf, 0, 1500); 355 icmp = (struct icmp *) sendbuf; 356 icmp->icmp_type = ICMP_ECHO; 357 icmp->icmp_code = 0; 358 icmp->icmp_id = htons(pid); 359 icmp->icmp_seq = htons(seq); 360 /** 361 * checksum has to be set to zero before we can calculate the 362 * real checksum! 363 */ 364 icmp->icmp_cksum = 0; 365 icmp->icmp_cksum = in_cksum((u_short *)icmp, 64); 366 /** 367 * Ping! 368 */ 369 n = sendto(fd, sendbuf, 64, 0, (struct sockaddr *)him, 370 sizeof(struct sockaddr)); 371 if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) { 372 NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet"); 373 closesocket(fd); 374 WSACloseEvent(hEvent); 375 return JNI_FALSE; 376 } 377 378 /* 379 * wait for 1 second at most 380 */ 381 tmout2 = timeout > 1000 ? 1000 : timeout; 382 do { 383 tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2); 384 if (tmout2 >= 0) { 385 len = sizeof(sa_recv); 386 n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, &sa_recv, &len); 387 ip = (struct ip*) recvbuf; 388 hlen1 = (ip->ip_hl) << 2; 389 icmp = (struct icmp *) (recvbuf + hlen1); 390 icmplen = n - hlen1; 391 /** 392 * Is that a proper ICMP reply? 393 */ 394 if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY && 395 (ntohs(icmp->icmp_seq) == seq) && (ntohs(icmp->icmp_id) == pid)) { 396 closesocket(fd); 397 WSACloseEvent(hEvent); 398 return JNI_TRUE; 399 } 400 } 401 } while (tmout2 > 0); 402 timeout -= 1000; 403 seq++; 404 } while (timeout > 0); 405 closesocket(fd); 406 WSACloseEvent(hEvent); 407 return JNI_FALSE; 408 } 409 410 /* 411 * Class: java_net_Inet4AddressImpl 412 * Method: isReachable0 413 * Signature: ([bI[bI)Z 414 */ 415 JNIEXPORT jboolean JNICALL 416 Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this, 417 jbyteArray addrArray, 418 jint timeout, 419 jbyteArray ifArray, 420 jint ttl) { 421 jint addr; 422 jbyte caddr[4]; 423 jint fd; 424 struct sockaddr_in him; 425 struct sockaddr_in* netif = NULL; 426 struct sockaddr_in inf; 427 int len = 0; 428 WSAEVENT hEvent; 429 int connect_rv = -1; 430 int sz; 431 432 /** 433 * Convert IP address from byte array to integer 434 */ 435 sz = (*env)->GetArrayLength(env, addrArray); 436 if (sz != 4) { 437 return JNI_FALSE; 438 } 439 memset((char *) &him, 0, sizeof(him)); 440 memset((char *) caddr, 0, sizeof(caddr)); 441 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 442 addr = ((caddr[0]<<24) & 0xff000000); 443 addr |= ((caddr[1] <<16) & 0xff0000); 444 addr |= ((caddr[2] <<8) & 0xff00); 445 addr |= (caddr[3] & 0xff); 446 addr = htonl(addr); 447 /** 448 * Socket address 449 */ 450 him.sin_addr.s_addr = addr; 451 him.sin_family = AF_INET; 452 len = sizeof(him); 453 454 /** 455 * If a network interface was specified, let's convert its address 456 * as well. 457 */ 458 if (!(IS_NULL(ifArray))) { 459 memset((char *) caddr, 0, sizeof(caddr)); 460 (*env)->GetByteArrayRegion(env, ifArray, 0, 4, caddr); 461 addr = ((caddr[0]<<24) & 0xff000000); 462 addr |= ((caddr[1] <<16) & 0xff0000); 463 addr |= ((caddr[2] <<8) & 0xff00); 464 addr |= (caddr[3] & 0xff); 465 addr = htonl(addr); 466 inf.sin_addr.s_addr = addr; 467 inf.sin_family = AF_INET; 468 inf.sin_port = 0; 469 netif = &inf; 470 } 471 472 #if 0 473 /* 474 * Windows implementation of ICMP & RAW sockets is too unreliable for now. 475 * Therefore it's best not to try it at all and rely only on TCP 476 * We may revisit and enable this code in the future. 477 */ 478 479 /* 480 * Let's try to create a RAW socket to send ICMP packets 481 * This usually requires "root" privileges, so it's likely to fail. 482 */ 483 fd = NET_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 484 if (fd != -1) { 485 /* 486 * It didn't fail, so we can use ICMP_ECHO requests. 487 */ 488 return ping4(env, fd, &him, timeout, netif, ttl); 489 } 490 #endif 491 492 /* 493 * Can't create a raw socket, so let's try a TCP socket 494 */ 495 fd = NET_Socket(AF_INET, SOCK_STREAM, 0); 496 if (fd == JVM_IO_ERR) { 497 /* note: if you run out of fds, you may not be able to load 498 * the exception class, and get a NoClassDefFoundError 499 * instead. 500 */ 501 NET_ThrowNew(env, WSAGetLastError(), "Can't create socket"); 502 return JNI_FALSE; 503 } 504 if (ttl > 0) { 505 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *)&ttl, sizeof(ttl)); 506 } 507 /* 508 * A network interface was specified, so let's bind to it. 509 */ 510 if (netif != NULL) { 511 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 512 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 513 closesocket(fd); 514 return JNI_FALSE; 515 } 516 } 517 518 /* 519 * Make the socket non blocking so we can use select/poll. 520 */ 521 hEvent = WSACreateEvent(); 522 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 523 524 /* no need to use NET_Connect as non-blocking */ 525 him.sin_port = htons(7); /* Echo */ 526 connect_rv = connect(fd, (struct sockaddr *)&him, len); 527 528 /** 529 * connection established or refused immediately, either way it means 530 * we were able to reach the host! 531 */ 532 if (connect_rv == 0 || WSAGetLastError() == WSAECONNREFUSED) { 533 WSACloseEvent(hEvent); 534 closesocket(fd); 535 return JNI_TRUE; 536 } else { 537 int optlen; 538 539 switch (WSAGetLastError()) { 540 case WSAEHOSTUNREACH: /* Host Unreachable */ 541 case WSAENETUNREACH: /* Network Unreachable */ 542 case WSAENETDOWN: /* Network is down */ 543 case WSAEPFNOSUPPORT: /* Protocol Family unsupported */ 544 WSACloseEvent(hEvent); 545 closesocket(fd); 546 return JNI_FALSE; 547 } 548 549 if (WSAGetLastError() != WSAEWOULDBLOCK) { 550 NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException", 551 "connect failed"); 552 WSACloseEvent(hEvent); 553 closesocket(fd); 554 return JNI_FALSE; 555 } 556 557 timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout); 558 559 /* has connection been established */ 560 561 if (timeout >= 0) { 562 optlen = sizeof(connect_rv); 563 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, 564 &optlen) <0) { 565 connect_rv = WSAGetLastError(); 566 } 567 568 if (connect_rv == 0 || connect_rv == WSAECONNREFUSED) { 569 WSACloseEvent(hEvent); 570 closesocket(fd); 571 return JNI_TRUE; 572 } 573 } 574 } 575 WSACloseEvent(hEvent); 576 closesocket(fd); 577 return JNI_FALSE; 578 } --- EOF ---