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 /* 115 * Find an internet address for a given hostname. Not this this 116 * code only works for addresses of type INET. The translation 117 * of %d.%d.%d.%d to an address (int) occurs in java now, so the 118 * String "host" shouldn't be a %d.%d.%d.%d string. The only 119 * exception should be when any of the %d are out of range and 120 * we fallback to a lookup. 121 * 122 * Class: java_net_Inet4AddressImpl 123 * Method: lookupAllHostAddr 124 * Signature: (Ljava/lang/String;)[[B 125 * 126 * This is almost shared code 127 */ 128 129 JNIEXPORT jobjectArray JNICALL 130 Java_java_net_Inet4AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this, 131 jstring host) { 132 const char *hostname; 133 struct hostent *hp; 134 unsigned int addr[4]; 135 136 jobjectArray ret = NULL; 137 138 initInetAddressIDs(env); 139 JNU_CHECK_EXCEPTION_RETURN(env, NULL); 140 141 if (IS_NULL(host)) { 142 JNU_ThrowNullPointerException(env, "host argument"); 143 return NULL; 144 } 145 hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); 146 CHECK_NULL_RETURN(hostname, NULL); 147 148 /* 149 * The NT/2000 resolver tolerates a space in front of localhost. This 150 * is not consistent with other implementations of gethostbyname. 151 * In addition we must do a white space check on Solaris to avoid a 152 * bug whereby 0.0.0.0 is returned if any host name has a white space. 153 */ 154 if (isspace(hostname[0])) { 155 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 156 goto cleanupAndReturn; 157 } 158 159 /* 160 * If the format is x.x.x.x then don't use gethostbyname as Windows 161 * is unable to handle octets which are out of range. 162 */ 163 if (isDottedIPAddress(hostname, &addr[0])) { 164 unsigned int address; 165 jobject iaObj; 166 167 /* 168 * Are any of the octets out of range? 169 */ 170 if (addr[0] > 255 || addr[1] > 255 || addr[2] > 255 || addr[3] > 255) { 171 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 172 goto cleanupAndReturn; 173 } 174 175 /* 176 * Return an byte array with the populated address. 177 */ 178 address = (addr[3]<<24) & 0xff000000; 179 address |= (addr[2]<<16) & 0xff0000; 180 address |= (addr[1]<<8) & 0xff00; 181 address |= addr[0]; 182 183 ret = (*env)->NewObjectArray(env, 1, ia_class, NULL); 184 185 if (IS_NULL(ret)) { 186 goto cleanupAndReturn; 187 } 188 189 iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID); 190 if (IS_NULL(iaObj)) { 191 ret = NULL; 192 goto cleanupAndReturn; 193 } 194 setInetAddress_addr(env, iaObj, ntohl(address)); 195 (*env)->SetObjectArrayElement(env, ret, 0, iaObj); 196 JNU_ReleaseStringPlatformChars(env, host, hostname); 197 return ret; 198 } 199 200 /* 201 * Perform the lookup 202 */ 203 if ((hp = gethostbyname((char*)hostname)) != NULL) { 204 struct in_addr **addrp = (struct in_addr **) hp->h_addr_list; 205 int len = sizeof(struct in_addr); 206 int i = 0; 207 208 while (*addrp != (struct in_addr *) 0) { 209 i++; 210 addrp++; 211 } 212 213 ret = (*env)->NewObjectArray(env, i, ia_class, NULL); 214 215 if (IS_NULL(ret)) { 216 goto cleanupAndReturn; 217 } 218 219 addrp = (struct in_addr **) hp->h_addr_list; 220 i = 0; 221 while (*addrp != (struct in_addr *) 0) { 222 jobject iaObj = (*env)->NewObject(env, ia4_class, ia4_ctrID); 223 if (IS_NULL(iaObj)) { 224 ret = NULL; 225 goto cleanupAndReturn; 226 } 227 setInetAddress_addr(env, iaObj, ntohl((*addrp)->s_addr)); 228 setInetAddress_hostName(env, iaObj, host); 229 (*env)->SetObjectArrayElement(env, ret, i, iaObj); 230 addrp++; 231 i++; 232 } 233 } else if (WSAGetLastError() == WSATRY_AGAIN) { 234 NET_ThrowByNameWithLastError(env, 235 JNU_JAVANETPKG "UnknownHostException", 236 hostname); 237 } else { 238 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", hostname); 239 } 240 241 cleanupAndReturn: 242 JNU_ReleaseStringPlatformChars(env, host, hostname); 243 return ret; 244 } 245 246 /* 247 * Class: java_net_Inet4AddressImpl 248 * Method: getHostByAddr 249 * Signature: (I)Ljava/lang/String; 250 */ 251 JNIEXPORT jstring JNICALL 252 Java_java_net_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, 253 jbyteArray addrArray) { 254 struct hostent *hp; 255 jbyte caddr[4]; 256 jint addr; 257 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 258 addr = ((caddr[0]<<24) & 0xff000000); 259 addr |= ((caddr[1] <<16) & 0xff0000); 260 addr |= ((caddr[2] <<8) & 0xff00); 261 addr |= (caddr[3] & 0xff); 262 addr = htonl(addr); 263 264 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET); 265 if (hp == NULL) { 266 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 267 return NULL; 268 } 269 if (hp->h_name == NULL) { /* Deal with bug in Windows XP */ 270 JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", 0); 271 return NULL; 272 } 273 return JNU_NewStringPlatform(env, hp->h_name); 274 } 275 276 277 /** 278 * ping implementation. 279 * Send a ICMP_ECHO_REQUEST packet every second until either the timeout 280 * expires or a answer is received. 281 * Returns true is an ECHO_REPLY is received, otherwise, false. 282 */ 283 static jboolean 284 ping4(JNIEnv *env, jint fd, struct sockaddr_in* him, jint timeout, 285 struct sockaddr_in* netif, jint ttl) { 286 jint size; 287 jint n, len, hlen1, icmplen; 288 char sendbuf[1500]; 289 char recvbuf[1500]; 290 struct icmp *icmp; 291 struct ip *ip; 292 WSAEVENT hEvent; 293 struct sockaddr sa_recv; 294 jint tmout2; 295 u_short pid, seq; 296 int read_rv = 0; 297 298 /* Initialize the sequence number to a suitable random number and 299 shift right one place to allow sufficient room for increamenting. */ 300 seq = ((unsigned short)rand()) >> 1; 301 302 /* icmp_id is a 16 bit data type, therefore down cast the pid */ 303 pid = (u_short) _getpid(); 304 size = 60*1024; 305 setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (const char *) &size, sizeof(size)); 306 /** 307 * A TTL was specified, let's set the socket option. 308 */ 309 if (ttl > 0) { 310 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *) &ttl, sizeof(ttl)); 311 } 312 313 /** 314 * A network interface was specified, let's bind to it. 315 */ 316 if (netif != NULL) { 317 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 318 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 319 closesocket(fd); 320 return JNI_FALSE; 321 } 322 } 323 324 /** 325 * Let's make the socket non blocking 326 */ 327 hEvent = WSACreateEvent(); 328 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 329 330 /** 331 * send 1 ICMP REQUEST every second until either we get a valid reply 332 * or the timeout expired. 333 */ 334 do { 335 /** 336 * construct the ICMP header 337 */ 338 memset(sendbuf, 0, 1500); 339 icmp = (struct icmp *) sendbuf; 340 icmp->icmp_type = ICMP_ECHO; 341 icmp->icmp_code = 0; 342 icmp->icmp_id = htons(pid); 343 icmp->icmp_seq = htons(seq); 344 /** 345 * checksum has to be set to zero before we can calculate the 346 * real checksum! 347 */ 348 icmp->icmp_cksum = 0; 349 icmp->icmp_cksum = in_cksum((u_short *)icmp, 64); 350 /** 351 * Ping! 352 */ 353 n = sendto(fd, sendbuf, 64, 0, (struct sockaddr *)him, 354 sizeof(struct sockaddr)); 355 if (n < 0 && WSAGetLastError() != WSAEWOULDBLOCK) { 356 NET_ThrowNew(env, WSAGetLastError(), "Can't send ICMP packet"); 357 closesocket(fd); 358 WSACloseEvent(hEvent); 359 return JNI_FALSE; 360 } 361 362 /* 363 * wait for 1 second at most 364 */ 365 tmout2 = timeout > 1000 ? 1000 : timeout; 366 do { 367 tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2); 368 if (tmout2 >= 0) { 369 len = sizeof(sa_recv); 370 n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, &sa_recv, &len); 371 ip = (struct ip*) recvbuf; 372 hlen1 = (ip->ip_hl) << 2; 373 icmp = (struct icmp *) (recvbuf + hlen1); 374 icmplen = n - hlen1; 375 /** 376 * Is that a proper ICMP reply? 377 */ 378 if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY && 379 (ntohs(icmp->icmp_seq) == seq) && (ntohs(icmp->icmp_id) == pid)) { 380 closesocket(fd); 381 WSACloseEvent(hEvent); 382 return JNI_TRUE; 383 } 384 } 385 } while (tmout2 > 0); 386 timeout -= 1000; 387 seq++; 388 } while (timeout > 0); 389 closesocket(fd); 390 WSACloseEvent(hEvent); 391 return JNI_FALSE; 392 } 393 394 /* 395 * Class: java_net_Inet4AddressImpl 396 * Method: isReachable0 397 * Signature: ([bI[bI)Z 398 */ 399 JNIEXPORT jboolean JNICALL 400 Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this, 401 jbyteArray addrArray, 402 jint timeout, 403 jbyteArray ifArray, 404 jint ttl) { 405 jint addr; 406 jbyte caddr[4]; 407 jint fd; 408 struct sockaddr_in him; 409 struct sockaddr_in* netif = NULL; 410 struct sockaddr_in inf; 411 int len = 0; 412 WSAEVENT hEvent; 413 int connect_rv = -1; 414 int sz; 415 416 /** 417 * Convert IP address from byte array to integer 418 */ 419 sz = (*env)->GetArrayLength(env, addrArray); 420 if (sz != 4) { 421 return JNI_FALSE; 422 } 423 memset((char *) &him, 0, sizeof(him)); 424 memset((char *) caddr, 0, sizeof(caddr)); 425 (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); 426 addr = ((caddr[0]<<24) & 0xff000000); 427 addr |= ((caddr[1] <<16) & 0xff0000); 428 addr |= ((caddr[2] <<8) & 0xff00); 429 addr |= (caddr[3] & 0xff); 430 addr = htonl(addr); 431 /** 432 * Socket address 433 */ 434 him.sin_addr.s_addr = addr; 435 him.sin_family = AF_INET; 436 len = sizeof(him); 437 438 /** 439 * If a network interface was specified, let's convert its address 440 * as well. 441 */ 442 if (!(IS_NULL(ifArray))) { 443 memset((char *) caddr, 0, sizeof(caddr)); 444 (*env)->GetByteArrayRegion(env, ifArray, 0, 4, caddr); 445 addr = ((caddr[0]<<24) & 0xff000000); 446 addr |= ((caddr[1] <<16) & 0xff0000); 447 addr |= ((caddr[2] <<8) & 0xff00); 448 addr |= (caddr[3] & 0xff); 449 addr = htonl(addr); 450 inf.sin_addr.s_addr = addr; 451 inf.sin_family = AF_INET; 452 inf.sin_port = 0; 453 netif = &inf; 454 } 455 456 #if 0 457 /* 458 * Windows implementation of ICMP & RAW sockets is too unreliable for now. 459 * Therefore it's best not to try it at all and rely only on TCP 460 * We may revisit and enable this code in the future. 461 */ 462 463 /* 464 * Let's try to create a RAW socket to send ICMP packets 465 * This usually requires "root" privileges, so it's likely to fail. 466 */ 467 fd = NET_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); 468 if (fd != -1) { 469 /* 470 * It didn't fail, so we can use ICMP_ECHO requests. 471 */ 472 return ping4(env, fd, &him, timeout, netif, ttl); 473 } 474 #endif 475 476 /* 477 * Can't create a raw socket, so let's try a TCP socket 478 */ 479 fd = NET_Socket(AF_INET, SOCK_STREAM, 0); 480 if (fd == SOCKET_ERROR) { 481 /* note: if you run out of fds, you may not be able to load 482 * the exception class, and get a NoClassDefFoundError 483 * instead. 484 */ 485 NET_ThrowNew(env, WSAGetLastError(), "Can't create socket"); 486 return JNI_FALSE; 487 } 488 if (ttl > 0) { 489 setsockopt(fd, IPPROTO_IP, IP_TTL, (const char *)&ttl, sizeof(ttl)); 490 } 491 /* 492 * A network interface was specified, so let's bind to it. 493 */ 494 if (netif != NULL) { 495 if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { 496 NET_ThrowNew(env, WSAGetLastError(), "Can't bind socket"); 497 closesocket(fd); 498 return JNI_FALSE; 499 } 500 } 501 502 /* 503 * Make the socket non blocking so we can use select/poll. 504 */ 505 hEvent = WSACreateEvent(); 506 WSAEventSelect(fd, hEvent, FD_READ|FD_CONNECT|FD_CLOSE); 507 508 /* no need to use NET_Connect as non-blocking */ 509 him.sin_port = htons(7); /* Echo */ 510 connect_rv = connect(fd, (struct sockaddr *)&him, len); 511 512 /** 513 * connection established or refused immediately, either way it means 514 * we were able to reach the host! 515 */ 516 if (connect_rv == 0 || WSAGetLastError() == WSAECONNREFUSED) { 517 WSACloseEvent(hEvent); 518 closesocket(fd); 519 return JNI_TRUE; 520 } else { 521 int optlen; 522 523 switch (WSAGetLastError()) { 524 case WSAEHOSTUNREACH: /* Host Unreachable */ 525 case WSAENETUNREACH: /* Network Unreachable */ 526 case WSAENETDOWN: /* Network is down */ 527 case WSAEPFNOSUPPORT: /* Protocol Family unsupported */ 528 WSACloseEvent(hEvent); 529 closesocket(fd); 530 return JNI_FALSE; 531 } 532 533 if (WSAGetLastError() != WSAEWOULDBLOCK) { 534 NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException", 535 "connect failed"); 536 WSACloseEvent(hEvent); 537 closesocket(fd); 538 return JNI_FALSE; 539 } 540 541 timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout); 542 543 /* has connection been established */ 544 545 if (timeout >= 0) { 546 optlen = sizeof(connect_rv); 547 if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, 548 &optlen) <0) { 549 connect_rv = WSAGetLastError(); 550 } 551 552 if (connect_rv == 0 || connect_rv == WSAECONNREFUSED) { 553 WSACloseEvent(hEvent); 554 closesocket(fd); 555 return JNI_TRUE; 556 } 557 } 558 } 559 WSACloseEvent(hEvent); 560 closesocket(fd); 561 return JNI_FALSE; 562 }