| /* |
| * Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in_systm.h> |
| #include <netinet/in.h> |
| #include <netinet/ip.h> |
| #include <netinet/ip_icmp.h> |
| #include <netdb.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <ctype.h> |
| |
| #include "jvm.h" |
| #include "jni_util.h" |
| #include "net_util.h" |
| |
| #include "java_net_Inet4AddressImpl.h" |
| |
| /* the initial size of our hostent buffers */ |
| #define HENT_BUF_SIZE 1024 |
| #define BIG_HENT_BUF_SIZE 10240 /* a jumbo-sized one */ |
| |
| #ifndef __GLIBC__ |
| /* gethostname() is in libc.so but I can't find a header file for it */ |
| extern int gethostname(char *buf, int buf_len); |
| #endif |
| |
| /************************************************************************ |
| * Inet4AddressImpl |
| */ |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: getLocalHostName |
| * Signature: ()Ljava/lang/String; |
| */ |
| JNIEXPORT jstring JNICALL |
| Java_java_net_Inet4AddressImpl_getLocalHostName(JNIEnv *env, jobject this) { |
| char hostname[MAXHOSTNAMELEN+1]; |
| |
| hostname[0] = '\0'; |
| if (JVM_GetHostName(hostname, MAXHOSTNAMELEN)) { |
| /* Something went wrong, maybe networking is not setup? */ |
| strcpy(hostname, "localhost"); |
| } else { |
| #ifdef __linux__ |
| /* On Linux gethostname() says "host.domain.sun.com". On |
| * Solaris gethostname() says "host", so extra work is needed. |
| */ |
| #else |
| /* Solaris doesn't want to give us a fully qualified domain name. |
| * We do a reverse lookup to try and get one. This works |
| * if DNS occurs before NIS in /etc/resolv.conf, but fails |
| * if NIS comes first (it still gets only a partial name). |
| * We use thread-safe system calls. |
| */ |
| #endif /* __linux__ */ |
| struct hostent res, res2, *hp; |
| char buf[HENT_BUF_SIZE]; |
| char buf2[HENT_BUF_SIZE]; |
| int h_error=0; |
| |
| #ifdef __GLIBC__ |
| gethostbyname_r(hostname, &res, buf, sizeof(buf), &hp, &h_error); |
| #else |
| hp = gethostbyname_r(hostname, &res, buf, sizeof(buf), &h_error); |
| #endif |
| if (hp) { |
| #ifdef __GLIBC__ |
| gethostbyaddr_r(hp->h_addr, hp->h_length, AF_INET, |
| &res2, buf2, sizeof(buf2), &hp, &h_error); |
| #else |
| hp = gethostbyaddr_r(hp->h_addr, hp->h_length, AF_INET, |
| &res2, buf2, sizeof(buf2), &h_error); |
| #endif |
| if (hp) { |
| /* |
| * If gethostbyaddr_r() found a fully qualified host name, |
| * returns that name. Otherwise, returns the hostname |
| * found by gethostname(). |
| */ |
| char *p = hp->h_name; |
| if ((strlen(hp->h_name) > strlen(hostname)) |
| && (strncmp(hostname, hp->h_name, strlen(hostname)) == 0) |
| && (*(p + strlen(hostname)) == '.')) |
| strcpy(hostname, hp->h_name); |
| } |
| } |
| } |
| return (*env)->NewStringUTF(env, hostname); |
| } |
| |
| static jclass ni_iacls; |
| static jclass ni_ia4cls; |
| static jmethodID ni_ia4ctrID; |
| static jfieldID ni_iaaddressID; |
| static jfieldID ni_iahostID; |
| static jfieldID ni_iafamilyID; |
| static int initialized = 0; |
| |
| /* |
| * Find an internet address for a given hostname. Note that this |
| * code only works for addresses of type INET. The translation |
| * of %d.%d.%d.%d to an address (int) occurs in java now, so the |
| * String "host" shouldn't *ever* be a %d.%d.%d.%d string |
| * |
| * Class: java_net_Inet4AddressImpl |
| * Method: lookupAllHostAddr |
| * Signature: (Ljava/lang/String;)[[B |
| */ |
| |
| JNIEXPORT jobjectArray JNICALL |
| Java_java_net_Inet4AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this, |
| jstring host) { |
| const char *hostname; |
| jobject name; |
| jobjectArray ret = 0; |
| struct hostent res, *hp = 0; |
| char buf[HENT_BUF_SIZE]; |
| |
| /* temporary buffer, on the off chance we need to expand */ |
| char *tmp = NULL; |
| int h_error=0; |
| |
| if (!initialized) { |
| ni_iacls = (*env)->FindClass(env, "java/net/InetAddress"); |
| ni_iacls = (*env)->NewGlobalRef(env, ni_iacls); |
| ni_ia4cls = (*env)->FindClass(env, "java/net/Inet4Address"); |
| ni_ia4cls = (*env)->NewGlobalRef(env, ni_ia4cls); |
| ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V"); |
| ni_iaaddressID = (*env)->GetFieldID(env, ni_iacls, "address", "I"); |
| ni_iafamilyID = (*env)->GetFieldID(env, ni_iacls, "family", "I"); |
| ni_iahostID = (*env)->GetFieldID(env, ni_iacls, "hostName", "Ljava/lang/String;"); |
| initialized = 1; |
| } |
| |
| if (IS_NULL(host)) { |
| JNU_ThrowNullPointerException(env, "host is null"); |
| return 0; |
| } |
| hostname = JNU_GetStringPlatformChars(env, host, JNI_FALSE); |
| CHECK_NULL_RETURN(hostname, NULL); |
| |
| /* |
| * Workaround for Solaris bug 4160367 - if a hostname contains a |
| * white space then 0.0.0.0 is returned |
| */ |
| if (isspace(hostname[0])) { |
| JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", |
| (char *)hostname); |
| JNU_ReleaseStringPlatformChars(env, host, hostname); |
| return NULL; |
| } |
| |
| /* Try once, with our static buffer. */ |
| #ifdef __GLIBC__ |
| gethostbyname_r(hostname, &res, buf, sizeof(buf), &hp, &h_error); |
| #else |
| hp = gethostbyname_r(hostname, &res, buf, sizeof(buf), &h_error); |
| #endif |
| |
| /* With the re-entrant system calls, it's possible that the buffer |
| * we pass to it is not large enough to hold an exceptionally |
| * large DNS entry. This is signaled by errno->ERANGE. We try once |
| * more, with a very big size. |
| */ |
| if (hp == NULL && errno == ERANGE) { |
| if ((tmp = (char*)malloc(BIG_HENT_BUF_SIZE))) { |
| #ifdef __GLIBC__ |
| gethostbyname_r(hostname, &res, tmp, BIG_HENT_BUF_SIZE, |
| &hp, &h_error); |
| #else |
| hp = gethostbyname_r(hostname, &res, tmp, BIG_HENT_BUF_SIZE, |
| &h_error); |
| #endif |
| } |
| } |
| if (hp != NULL) { |
| struct in_addr **addrp = (struct in_addr **) hp->h_addr_list; |
| int len = sizeof(struct in_addr); |
| int i = 0; |
| |
| while (*addrp != (struct in_addr *) 0) { |
| i++; |
| addrp++; |
| } |
| |
| name = (*env)->NewStringUTF(env, hostname); |
| |
| if (IS_NULL(name)) { |
| goto cleanupAndReturn; |
| } |
| |
| ret = (*env)->NewObjectArray(env, i, ni_iacls, NULL); |
| if (IS_NULL(ret)) { |
| /* we may have memory to free at the end of this */ |
| goto cleanupAndReturn; |
| } |
| addrp = (struct in_addr **) hp->h_addr_list; |
| i = 0; |
| while (*addrp) { |
| jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID); |
| if (IS_NULL(iaObj)) { |
| ret = NULL; |
| goto cleanupAndReturn; |
| } |
| (*env)->SetIntField(env, iaObj, ni_iaaddressID, |
| ntohl((*addrp)->s_addr)); |
| (*env)->SetObjectField(env, iaObj, ni_iahostID, name); |
| (*env)->SetObjectArrayElement(env, ret, i, iaObj); |
| addrp++; |
| i++; |
| } |
| } else { |
| JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", |
| (char *)hostname); |
| ret = NULL; |
| } |
| |
| cleanupAndReturn: |
| JNU_ReleaseStringPlatformChars(env, host, hostname); |
| if (tmp != NULL) { |
| free(tmp); |
| } |
| return ret; |
| } |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: getHostByAddr |
| * Signature: (I)Ljava/lang/String; |
| */ |
| JNIEXPORT jstring JNICALL |
| Java_java_net_Inet4AddressImpl_getHostByAddr(JNIEnv *env, jobject this, |
| jbyteArray addrArray) { |
| jstring ret = NULL; |
| jint addr; |
| struct hostent hent, *hp = 0; |
| char buf[HENT_BUF_SIZE]; |
| int h_error = 0; |
| char *tmp = NULL; |
| |
| /* |
| * We are careful here to use the reentrant version of |
| * gethostbyname because at the Java level this routine is not |
| * protected by any synchronization. |
| * |
| * Still keeping the reentrant platform dependent calls temporarily |
| * We should probably conform to one interface later. |
| * |
| */ |
| jbyte caddr[4]; |
| (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); |
| addr = ((caddr[0]<<24) & 0xff000000); |
| addr |= ((caddr[1] <<16) & 0xff0000); |
| addr |= ((caddr[2] <<8) & 0xff00); |
| addr |= (caddr[3] & 0xff); |
| addr = htonl(addr); |
| #ifdef __GLIBC__ |
| gethostbyaddr_r((char *)&addr, sizeof(addr), AF_INET, &hent, |
| buf, sizeof(buf), &hp, &h_error); |
| #else |
| hp = gethostbyaddr_r((char *)&addr, sizeof(addr), AF_INET, &hent, |
| buf, sizeof(buf), &h_error); |
| #endif |
| /* With the re-entrant system calls, it's possible that the buffer |
| * we pass to it is not large enough to hold an exceptionally |
| * large DNS entry. This is signaled by errno->ERANGE. We try once |
| * more, with a very big size. |
| */ |
| if (hp == NULL && errno == ERANGE) { |
| if ((tmp = (char*)malloc(BIG_HENT_BUF_SIZE))) { |
| #ifdef __GLIBC__ |
| gethostbyaddr_r((char *)&addr, sizeof(addr), AF_INET, |
| &hent, tmp, BIG_HENT_BUF_SIZE, &hp, &h_error); |
| #else |
| hp = gethostbyaddr_r((char *)&addr, sizeof(addr), AF_INET, |
| &hent, tmp, BIG_HENT_BUF_SIZE, &h_error); |
| #endif |
| } else { |
| JNU_ThrowOutOfMemoryError(env, "getHostByAddr"); |
| } |
| } |
| if (hp == NULL) { |
| JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL); |
| } else { |
| ret = (*env)->NewStringUTF(env, hp->h_name); |
| } |
| if (tmp) { |
| free(tmp); |
| } |
| return ret; |
| } |
| |
| #define SET_NONBLOCKING(fd) { \ |
| int flags = fcntl(fd, F_GETFL); \ |
| flags |= O_NONBLOCK; \ |
| fcntl(fd, F_SETFL, flags); \ |
| } |
| |
| /** |
| * ping implementation. |
| * Send a ICMP_ECHO_REQUEST packet every second until either the timeout |
| * expires or a answer is received. |
| * Returns true is an ECHO_REPLY is received, otherwise, false. |
| */ |
| static jboolean |
| ping4(JNIEnv *env, jint fd, struct sockaddr_in* him, jint timeout, |
| struct sockaddr_in* netif, jint ttl) { |
| jint size; |
| jint n, len, hlen1, icmplen; |
| char sendbuf[1500]; |
| char recvbuf[1500]; |
| struct icmp *icmp; |
| struct ip *ip; |
| struct sockaddr_in sa_recv; |
| jchar pid; |
| jint tmout2, seq = 1; |
| struct timeval tv; |
| size_t plen; |
| |
| /* icmp_id is a 16 bit data type, therefore down cast the pid */ |
| pid = (jchar)getpid(); |
| size = 60*1024; |
| setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); |
| /* |
| * sets the ttl (max number of hops) |
| */ |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); |
| } |
| /* |
| * a specific interface was specified, so let's bind the socket |
| * to that interface to ensure the requests are sent only through it. |
| */ |
| if (netif != NULL) { |
| if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| /* |
| * Make the socket non blocking so we can use select |
| */ |
| SET_NONBLOCKING(fd); |
| do { |
| /* |
| * create the ICMP request |
| */ |
| icmp = (struct icmp *) sendbuf; |
| icmp->icmp_type = ICMP_ECHO; |
| icmp->icmp_code = 0; |
| icmp->icmp_id = htons(pid); |
| icmp->icmp_seq = htons(seq); |
| seq++; |
| gettimeofday(&tv, NULL); |
| memcpy(icmp->icmp_data, &tv, sizeof(tv)); |
| plen = ICMP_ADVLENMIN + sizeof(tv); |
| icmp->icmp_cksum = 0; |
| icmp->icmp_cksum = in_cksum((u_short *)icmp, plen); |
| /* |
| * send it |
| */ |
| n = sendto(fd, sendbuf, plen, 0, (struct sockaddr *)him, |
| sizeof(struct sockaddr)); |
| if (n < 0 && errno != EINPROGRESS ) { |
| NET_ThrowNew(env, errno, "Can't send ICMP packet"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| tmout2 = timeout > 1000 ? 1000 : timeout; |
| do { |
| tmout2 = NET_Wait(env, fd, NET_WAIT_READ, tmout2); |
| if (tmout2 >= 0) { |
| len = sizeof(sa_recv); |
| n = recvfrom(fd, recvbuf, sizeof(recvbuf), 0, (struct sockaddr *)&sa_recv, &len); |
| ip = (struct ip*) recvbuf; |
| hlen1 = (ip->ip_hl) << 2; |
| icmp = (struct icmp *) (recvbuf + hlen1); |
| icmplen = n - hlen1; |
| /* |
| * We did receive something, but is it what we were expecting? |
| * I.E.: A ICMP_ECHOREPLY packet with the proper PID. |
| */ |
| if (icmplen >= 8 && icmp->icmp_type == ICMP_ECHOREPLY && |
| (ntohs(icmp->icmp_id) == pid) && |
| (him->sin_addr.s_addr == sa_recv.sin_addr.s_addr)) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| } while (tmout2 > 0); |
| timeout -= 1000; |
| } while (timeout >0); |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| /* |
| * Class: java_net_Inet4AddressImpl |
| * Method: isReachable0 |
| * Signature: ([bI[bI)Z |
| */ |
| JNIEXPORT jboolean JNICALL |
| Java_java_net_Inet4AddressImpl_isReachable0(JNIEnv *env, jobject this, |
| jbyteArray addrArray, |
| jint timeout, |
| jbyteArray ifArray, |
| jint ttl) { |
| jint addr; |
| jbyte caddr[4]; |
| jint fd; |
| struct sockaddr_in him; |
| struct sockaddr_in* netif = NULL; |
| struct sockaddr_in inf; |
| int len = 0; |
| int connect_rv = -1; |
| int sz; |
| |
| memset((char *) caddr, 0, sizeof(caddr)); |
| memset((char *) &him, 0, sizeof(him)); |
| sz = (*env)->GetArrayLength(env, addrArray); |
| if (sz != 4) { |
| return JNI_FALSE; |
| } |
| (*env)->GetByteArrayRegion(env, addrArray, 0, 4, caddr); |
| addr = ((caddr[0]<<24) & 0xff000000); |
| addr |= ((caddr[1] <<16) & 0xff0000); |
| addr |= ((caddr[2] <<8) & 0xff00); |
| addr |= (caddr[3] & 0xff); |
| addr = htonl(addr); |
| him.sin_addr.s_addr = addr; |
| him.sin_family = AF_INET; |
| len = sizeof(him); |
| /* |
| * If a network interface was specified, let's create the address |
| * for it. |
| */ |
| if (!(IS_NULL(ifArray))) { |
| memset((char *) caddr, 0, sizeof(caddr)); |
| (*env)->GetByteArrayRegion(env, ifArray, 0, 4, caddr); |
| addr = ((caddr[0]<<24) & 0xff000000); |
| addr |= ((caddr[1] <<16) & 0xff0000); |
| addr |= ((caddr[2] <<8) & 0xff00); |
| addr |= (caddr[3] & 0xff); |
| addr = htonl(addr); |
| inf.sin_addr.s_addr = addr; |
| inf.sin_family = AF_INET; |
| inf.sin_port = 0; |
| netif = &inf; |
| } |
| |
| /* |
| * Let's try to create a RAW socket to send ICMP packets |
| * This usually requires "root" privileges, so it's likely to fail. |
| */ |
| fd = JVM_Socket(AF_INET, SOCK_RAW, IPPROTO_ICMP); |
| if (fd != -1) { |
| /* |
| * It didn't fail, so we can use ICMP_ECHO requests. |
| */ |
| return ping4(env, fd, &him, timeout, netif, ttl); |
| } |
| |
| /* |
| * Can't create a raw socket, so let's try a TCP socket |
| */ |
| fd = JVM_Socket(AF_INET, SOCK_STREAM, 0); |
| if (fd == JVM_IO_ERR) { |
| /* note: if you run out of fds, you may not be able to load |
| * the exception class, and get a NoClassDefFoundError |
| * instead. |
| */ |
| NET_ThrowNew(env, errno, "Can't create socket"); |
| return JNI_FALSE; |
| } |
| if (ttl > 0) { |
| setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)); |
| } |
| |
| /* |
| * A network interface was specified, so let's bind to it. |
| */ |
| if (netif != NULL) { |
| if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in)) < 0) { |
| NET_ThrowNew(env, errno, "Can't bind socket"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |
| |
| /* |
| * Make the socket non blocking so we can use select/poll. |
| */ |
| SET_NONBLOCKING(fd); |
| |
| /* no need to use NET_Connect as non-blocking */ |
| him.sin_port = htons(7); /* Echo */ |
| connect_rv = JVM_Connect(fd, (struct sockaddr *)&him, len); |
| |
| /** |
| * connection established or refused immediately, either way it means |
| * we were able to reach the host! |
| */ |
| if (connect_rv == 0 || errno == ECONNREFUSED) { |
| close(fd); |
| return JNI_TRUE; |
| } else { |
| int optlen; |
| |
| switch (errno) { |
| case ENETUNREACH: /* Network Unreachable */ |
| case EAFNOSUPPORT: /* Address Family not supported */ |
| case EADDRNOTAVAIL: /* address is not available on the remote machine */ |
| #ifdef __linux__ |
| case EINVAL: |
| /* |
| * On some Linuxes, when bound to the loopback interface, connect |
| * will fail and errno will be set to EINVAL. When that happens, |
| * don't throw an exception, just return false. |
| */ |
| #endif /* __linux__ */ |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| if (errno != EINPROGRESS) { |
| NET_ThrowByNameWithLastError(env, JNU_JAVANETPKG "ConnectException", |
| "connect failed"); |
| close(fd); |
| return JNI_FALSE; |
| } |
| |
| timeout = NET_Wait(env, fd, NET_WAIT_CONNECT, timeout); |
| if (timeout >= 0) { |
| /* has connection been established? */ |
| optlen = sizeof(connect_rv); |
| if (JVM_GetSockOpt(fd, SOL_SOCKET, SO_ERROR, (void*)&connect_rv, |
| &optlen) <0) { |
| connect_rv = errno; |
| } |
| if (connect_rv == 0 || connect_rv == ECONNREFUSED) { |
| close(fd); |
| return JNI_TRUE; |
| } |
| } |
| close(fd); |
| return JNI_FALSE; |
| } |
| } |