/*

 * Copyright 2000-2008 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.h>

#include <netdb.h>

#include <string.h>

#include <strings.h>

#include <stdlib.h>

#include <ctype.h>

#include "jvm.h"

#include "jni_util.h"

#include "net_util.h"

#ifndef IPV6_DEFS_H

#include <netinet/icmp6.h>

#endif

#include "java_net_Inet4AddressImpl.h"

#include "java_net_Inet6AddressImpl.h"

/* the initial size of our hostent buffers */

#ifndef NI_MAXHOST

#define NI_MAXHOST 1025

#endif

#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

/************************************************************************

 * Inet6AddressImpl

 */

/*

 * Class:     java_net_Inet6AddressImpl

 * Method:    getLocalHostName

 * Signature: ()Ljava/lang/String;

 */

JNIEXPORT jstring JNICALL

Java_java_net_Inet6AddressImpl_getLocalHostName(JNIEnv *env, jobject this) {

    char hostname[NI_MAXHOST+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.

         */

#ifdef AF_INET6

        if (NET_addrtransAvailable()) {

            struct addrinfo  hints, *res;

            int error;

            bzero(&hints, sizeof(hints));

            hints.ai_flags = AI_CANONNAME;

            hints.ai_family = AF_UNSPEC;

            error = (*getaddrinfo_ptr)(hostname, NULL, &hints, &res);

            if (error == 0) {

                /* host is known to name service */

                error = (*getnameinfo_ptr)(res->ai_addr,

                                           res->ai_addrlen,

                                           hostname,

                                           NI_MAXHOST,

                                           NULL,

                                           0,

                                           NI_NAMEREQD);

                /* if getnameinfo fails hostname is still the value

                   from gethostname */

                (*freeaddrinfo_ptr)(res);

            }

        }

#endif /* AF_INET6 */

#endif /* __linux__ */

    }

    return (*env)->NewStringUTF(env, hostname);

}

static jclass ni_iacls;

static jclass ni_ia4cls;

static jclass ni_ia6cls;

static jmethodID ni_ia4ctrID;

static jmethodID ni_ia6ctrID;

static jfieldID ni_iaaddressID;

static jfieldID ni_iahostID;

static jfieldID ni_iafamilyID;

static jfieldID ni_ia6ipaddressID;

static int initialized = 0;

/*

 * Find an internet address for a given hostname.  Not this 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_Inet6AddressImpl

 * Method:    lookupAllHostAddr

 * Signature: (Ljava/lang/String;)[[B

 */

JNIEXPORT jobjectArray JNICALL

Java_java_net_Inet6AddressImpl_lookupAllHostAddr(JNIEnv *env, jobject this,

                                                jstring host) {

    const char *hostname;

    jobjectArray ret = 0;

    int retLen = 0;

    jboolean preferIPv6Address;

    int error=0;

#ifdef AF_INET6

    struct addrinfo hints, *res, *resNew = NULL;

#endif /* AF_INET6 */

    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_ia6cls = (*env)->FindClass(env, "java/net/Inet6Address");

      ni_ia6cls = (*env)->NewGlobalRef(env, ni_ia6cls);

      ni_ia4ctrID = (*env)->GetMethodID(env, ni_ia4cls, "<init>", "()V");

      ni_ia6ctrID = (*env)->GetMethodID(env, ni_ia6cls, "<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;");

      ni_ia6ipaddressID = (*env)->GetFieldID(env, ni_ia6cls, "ipaddress", "[B");

      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);

#ifdef AF_INET6

    if (NET_addrtransAvailable()) {

        static jfieldID ia_preferIPv6AddressID;

        if (ia_preferIPv6AddressID == NULL) {

            jclass c = (*env)->FindClass(env,"java/net/InetAddress");

            if (c)  {

                ia_preferIPv6AddressID =

                    (*env)->GetStaticFieldID(env, c, "preferIPv6Address", "Z");

            }

            if (ia_preferIPv6AddressID == NULL) {

                JNU_ReleaseStringPlatformChars(env, host, hostname);

                return NULL;

            }

        }

        /* get the address preference */

        preferIPv6Address

            = (*env)->GetStaticBooleanField(env, ia_class, ia_preferIPv6AddressID);

        /* Try once, with our static buffer. */

        bzero(&hints, sizeof(hints));

        hints.ai_flags = AI_CANONNAME;

        hints.ai_family = AF_UNSPEC;

        /*

         * 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;

        }

        error = (*getaddrinfo_ptr)(hostname, NULL, &hints, &res);

        if (error) {

            /* report error */

            JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException",

                            (char *)hostname);

            JNU_ReleaseStringPlatformChars(env, host, hostname);

            return NULL;

        } else {

            int i = 0;

            int inetCount = 0, inet6Count = 0, inetIndex, inet6Index;

            while (iterator != NULL) {

                int skip = 0;

                itr = resNew;

                while (itr != NULL) {

                    if (iterator->ai_family == itr->ai_family &&

                        iterator->ai_addrlen == itr->ai_addrlen) {

                        if (itr->ai_family == AF_INET) { /* AF_INET */

                            struct sockaddr_in *addr1, *addr2;

                            addr1 = (struct sockaddr_in *)iterator->ai_addr;

                            addr2 = (struct sockaddr_in *)itr->ai_addr;

                            if (addr1->sin_addr.s_addr ==

                                addr2->sin_addr.s_addr) {

                                skip = 1;

                                break;

                            }

                        } else {

                            int t;

                            struct sockaddr_in6 *addr1, *addr2;

                            addr1 = (struct sockaddr_in6 *)iterator->ai_addr;

                            addr2 = (struct sockaddr_in6 *)itr->ai_addr;

                            for (t = 0; t < 16; t++) {

                                if (addr1->sin6_addr.s6_addr[t] !=

                                    addr2->sin6_addr.s6_addr[t]) {

                                    break;

                                }

                            }

                            if (t < 16) {

                                itr = itr->ai_next;

                                continue;

                            } else {

                                skip = 1;

                                break;

                            }

                        }

                    } else if (iterator->ai_family != AF_INET &&

                               iterator->ai_family != AF_INET6) {

                        /* we can't handle other family types */

                        skip = 1;

                        break;

                    }

                    itr = itr->ai_next;

                }

                if (!skip) {

                    struct addrinfo *next

                        = (struct addrinfo*) malloc(sizeof(struct addrinfo));

                    if (!next) {

                        JNU_ThrowOutOfMemoryError(env, "heap allocation failed");

                        ret = NULL;

                        goto cleanupAndReturn;

                    }

                    memcpy(next, iterator, sizeof(struct addrinfo));

                    next->ai_next = NULL;

                    if (resNew == NULL) {

                        resNew = next;

                    } else {

                        last->ai_next = next;

                    }

                    last = next;

                    i++;

                    if (iterator->ai_family == AF_INET) {

                        inetCount ++;

                    } else if (iterator->ai_family == AF_INET6) {

                        inet6Count ++;

                    }

                }

                iterator = iterator->ai_next;

            }

            retLen = i;

            iterator = resNew;

            ret = (*env)->NewObjectArray(env, retLen, ni_iacls, NULL);

            if (IS_NULL(ret)) {

                /* we may have memory to free at the end of this */

                goto cleanupAndReturn;

            }

            if (preferIPv6Address) {

                /* AF_INET addresses will be offset by inet6Count */

                inetIndex = inet6Count;

                inet6Index = 0;

            } else {

                /* AF_INET6 addresses will be offset by inetCount */

                inetIndex = 0;

                inet6Index = inetCount;

            }

            while (iterator != NULL) {

              if (iterator->ai_family == AF_INET) {

                jobject iaObj = (*env)->NewObject(env, ni_ia4cls, ni_ia4ctrID);

                if (IS_NULL(iaObj)) {

                  ret = NULL;

                  goto cleanupAndReturn;

                }

                (*env)->SetIntField(env, iaObj, ni_iaaddressID,

                                    ntohl(((struct sockaddr_in*)iterator->ai_addr)->sin_addr.s_addr));

                (*env)->SetObjectField(env, iaObj, ni_iahostID, host);

                (*env)->SetObjectArrayElement(env, ret, inetIndex, iaObj);

                inetIndex++;

              } else if (iterator->ai_family == AF_INET6) {

                jint scope = 0;

                jbyteArray ipaddress;

                jobject iaObj = (*env)->NewObject(env, ni_ia6cls, ni_ia6ctrID);

                if (IS_NULL(iaObj)) {

                  ret = NULL;

                  goto cleanupAndReturn;

                }

                ipaddress = (*env)->NewByteArray(env, 16);

                if (IS_NULL(ipaddress)) {

                  ret = NULL;

                  goto cleanupAndReturn;

                }

                (*env)->SetByteArrayRegion(env, ipaddress, 0, 16,

                                           (jbyte *)&(((struct sockaddr_in6*)iterator->ai_addr)->sin6_addr));

#ifdef __linux__

                if (!kernelIsV22()) {

                  scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;

                }

#else

                scope = ((struct sockaddr_in6*)iterator->ai_addr)->sin6_scope_id;

#endif

                if (scope != 0) { /* zero is default value, no need to set */

                  (*env)->SetIntField(env, iaObj, ia6_scopeidID, scope);

                  (*env)->SetBooleanField(env, iaObj, ia6_scopeidsetID, JNI_TRUE);

                }

                (*env)->SetObjectField(env, iaObj, ni_ia6ipaddressID, ipaddress);

                (*env)->SetObjectField(env, iaObj, ni_iahostID, host);

                (*env)->SetObjectArrayElement(env, ret, inet6Index, iaObj);

                inet6Index++;

              }

              iterator = iterator->ai_next;

            }

        }

    }

#endif /* AF_INET6 */

cleanupAndReturn:

    {

        struct addrinfo *iterator, *tmp;

        iterator = resNew;

        while (iterator != NULL) {

            tmp = iterator;

            iterator = iterator->ai_next;

            free(tmp);

        }

        JNU_ReleaseStringPlatformChars(env, host, hostname);

    }

#ifdef AF_INET6

    if (NET_addrtransAvailable())

        (*freeaddrinfo_ptr)(res);

#endif /* AF_INET6 */

    return ret;

}

/*

 * Class:     java_net_Inet6AddressImpl

 * Method:    getHostByAddr

 * Signature: (I)Ljava/lang/String;

 */

JNIEXPORT jstring JNICALL

Java_java_net_Inet6AddressImpl_getHostByAddr(JNIEnv *env, jobject this,

                                            jbyteArray addrArray) {

    jstring ret = NULL;

#ifdef AF_INET6

    char host[NI_MAXHOST+1];

    int error = 0;

    int len = 0;

    jbyte caddr[16];

    if (NET_addrtransAvailable()) {

        struct sockaddr_in him4;

        struct sockaddr_in6 him6;

        struct sockaddr *sa;

        /*

         * For IPv4 addresses construct a sockaddr_in structure.

         */

        if ((*env)->GetArrayLength(env, addrArray) == 4) {

            jint addr;

            (*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);

            memset((char *) &him4, 0, sizeof(him4));

            him4.sin_addr.s_addr = (uint32_t) htonl(addr);

            him4.sin_family = AF_INET;

            sa = (struct sockaddr *) &him4;

            len = sizeof(him4);

        } else {

            /*

             * For IPv6 address construct a sockaddr_in6 structure.

             */

            (*env)->GetByteArrayRegion(env, addrArray, 0, 16, caddr);

            memset((char *) &him6, 0, sizeof(him6));

            memcpy((void *)&(him6.sin6_addr), caddr, sizeof(struct in6_addr) );

            him6.sin6_family = AF_INET6;

            sa = (struct sockaddr *) &him6 ;

            len = sizeof(him6) ;

        }

        error = (*getnameinfo_ptr)(sa, len, host, NI_MAXHOST, NULL, 0,

                                   NI_NAMEREQD);

        if (!error) {

            ret = (*env)->NewStringUTF(env, host);

        }

    }

#endif /* AF_INET6 */

    if (ret == NULL) {

        JNU_ThrowByName(env, JNU_JAVANETPKG "UnknownHostException", NULL);

    }

    return ret;

}

#define SET_NONBLOCKING(fd) {           \

        int flags = fcntl(fd, F_GETFL); \

        flags |= O_NONBLOCK;            \

        fcntl(fd, F_SETFL, flags);      \

}

#ifdef AF_INET6

static jboolean

ping6(JNIEnv *env, jint fd, struct sockaddr_in6* him, jint timeout,

      struct sockaddr_in6* netif, jint ttl) {

    jint size;

    char sendbuf[1500];

    unsigned char recvbuf[1500];

    struct icmp6_hdr *icmp6;

    struct sockaddr_in6 sa_recv;

    jbyte *caddr, *recv_caddr;

    jchar pid;

    jint tmout2, seq = 1;

    struct timeval tv;

    size_t plen;

#ifdef __linux__

    {

    int csum_offset;

    /**

     * For some strange reason, the linux kernel won't calculate the

     * checksum of ICMPv6 packets unless you set this socket option

     */

    csum_offset = 2;

    setsockopt(fd, SOL_RAW, IPV6_CHECKSUM, &csum_offset, sizeof(int));

    }

#endif

    caddr = (jbyte *)&(him->sin6_addr);

    /* 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));

    if (ttl > 0) {

      setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));

    }

    if (netif != NULL) {

      if (bind(fd, (struct sockaddr*)netif, sizeof(struct sockaddr_in6)) <0) {

        NET_ThrowNew(env, errno, "Can't bind socket");

        close(fd);

        return JNI_FALSE;

      }

    }

    SET_NONBLOCKING(fd);

    do {

      icmp6 = (struct icmp6_hdr *) sendbuf;

      icmp6->icmp6_type = ICMP6_ECHO_REQUEST;

      icmp6->icmp6_code = 0;

      /* let's tag the ECHO packet with our pid so we can identify it */

      icmp6->icmp6_id = htons(pid);

      icmp6->icmp6_seq = htons(seq);

      seq++;

      icmp6->icmp6_cksum = 0;

      gettimeofday(&tv, NULL);

      memcpy(sendbuf + sizeof(struct icmp6_hdr), &tv, sizeof(tv));

      plen = sizeof(struct icmp6_hdr) + sizeof(tv);

      n = sendto(fd, sendbuf, plen, 0, (struct sockaddr*) him, sizeof(struct sockaddr_in6));

      if (n < 0 && errno != EINPROGRESS) {

        NET_ThrowNew(env, errno, "Can't send ICMP packet");

        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);

          icmp6 = (struct icmp6_hdr *) (recvbuf);

          recv_caddr = (jbyte *)&(sa_recv.sin6_addr);

          /*

           * We did receive something, but is it what we were expecting?