1 /*
2 * Copyright (c) 2001, 2012, 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 "jni.h"
27 #include "jni_util.h"
28 #include "jvm.h"
29 #include "jlong.h"
30
31 #include <netdb.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <errno.h>
37
38 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
39 #include <netinet/in.h>
40 #endif
41
42 #include "net_util.h"
43 #include "net_util_md.h"
44 #include "nio.h"
45 #include "nio_util.h"
46
47 #include "sun_nio_ch_DatagramChannelImpl.h"
48
49 static jfieldID dci_senderID; /* sender in sun.nio.ch.DatagramChannelImpl */
50 static jfieldID dci_senderAddrID; /* sender InetAddress in sun.nio.ch.DatagramChannelImpl */
51 static jfieldID dci_senderPortID; /* sender port in sun.nio.ch.DatagramChannelImpl */
52 static jclass isa_class; /* java.net.InetSocketAddress */
53 static jmethodID isa_ctorID; /* .InetSocketAddress(InetAddress, int) */
54
55 JNIEXPORT void JNICALL
Java_sun_nio_ch_DatagramChannelImpl_initIDs(JNIEnv * env,jclass clazz)56 Java_sun_nio_ch_DatagramChannelImpl_initIDs(JNIEnv *env, jclass clazz)
57 {
58 clazz = (*env)->FindClass(env, "java/net/InetSocketAddress");
59 CHECK_NULL(clazz);
60 isa_class = (*env)->NewGlobalRef(env, clazz);
61 if (isa_class == NULL) {
62 JNU_ThrowOutOfMemoryError(env, NULL);
63 return;
64 }
65 isa_ctorID = (*env)->GetMethodID(env, clazz, "<init>",
66 "(Ljava/net/InetAddress;I)V");
67 CHECK_NULL(isa_ctorID);
68
69 clazz = (*env)->FindClass(env, "sun/nio/ch/DatagramChannelImpl");
70 CHECK_NULL(clazz);
71 dci_senderID = (*env)->GetFieldID(env, clazz, "sender",
72 "Ljava/net/SocketAddress;");
73 CHECK_NULL(dci_senderID);
74 dci_senderAddrID = (*env)->GetFieldID(env, clazz,
75 "cachedSenderInetAddress",
76 "Ljava/net/InetAddress;");
77 CHECK_NULL(dci_senderAddrID);
78 dci_senderPortID = (*env)->GetFieldID(env, clazz,
79 "cachedSenderPort", "I");
80 CHECK_NULL(dci_senderPortID);
81 }
82
83 JNIEXPORT void JNICALL
Java_sun_nio_ch_DatagramChannelImpl_disconnect0(JNIEnv * env,jobject this,jobject fdo,jboolean isIPv6)84 Java_sun_nio_ch_DatagramChannelImpl_disconnect0(JNIEnv *env, jobject this,
85 jobject fdo, jboolean isIPv6)
86 {
87 jint fd = fdval(env, fdo);
88 int rv;
89
90 #ifdef __solaris__
91 rv = connect(fd, 0, 0);
92 #endif
93
94 #if defined(__linux__) || defined(_ALLBSD_SOURCE) || defined(_AIX)
95 {
96 int len;
97 SOCKADDR sa;
98
99 memset(&sa, 0, sizeof(sa));
100
101 #ifdef AF_INET6
102 if (isIPv6) {
103 struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)&sa;
104 #if defined(_ALLBSD_SOURCE)
105 him6->sin6_family = AF_INET6;
106 #else
107 him6->sin6_family = AF_UNSPEC;
108 #endif
109 len = sizeof(struct sockaddr_in6);
110 } else
111 #endif
112 {
113 struct sockaddr_in *him4 = (struct sockaddr_in*)&sa;
114 #if defined(_ALLBSD_SOURCE)
115 him4->sin_family = AF_INET;
116 #else
117 him4->sin_family = AF_UNSPEC;
118 #endif
119 len = sizeof(struct sockaddr_in);
120 }
121
122 rv = connect(fd, (struct sockaddr *)&sa, len);
123
124 #if defined(_ALLBSD_SOURCE)
125 if (rv < 0 && errno == EADDRNOTAVAIL)
126 rv = errno = 0;
127 #endif
128 #if defined(_AIX)
129 /* See W. Richard Stevens, "UNIX Network Programming, Volume 1", p. 254:
130 * 'Setting the address family to AF_UNSPEC might return EAFNOSUPPORT
131 * but that is acceptable.
132 */
133 if (rv < 0 && errno == EAFNOSUPPORT)
134 rv = errno = 0;
135 #endif
136 }
137 #endif
138
139 if (rv < 0)
140 handleSocketError(env, errno);
141
142 }
143
144 JNIEXPORT jint JNICALL
Java_sun_nio_ch_DatagramChannelImpl_receive0(JNIEnv * env,jobject this,jobject fdo,jlong address,jint len,jboolean connected)145 Java_sun_nio_ch_DatagramChannelImpl_receive0(JNIEnv *env, jobject this,
146 jobject fdo, jlong address,
147 jint len, jboolean connected)
148 {
149 jint fd = fdval(env, fdo);
150 void *buf = (void *)jlong_to_ptr(address);
151 SOCKADDR sa;
152 socklen_t sa_len = SOCKADDR_LEN;
153 jboolean retry = JNI_FALSE;
154 jint n = 0;
155 jobject senderAddr;
156
157 if (len > MAX_PACKET_LEN) {
158 len = MAX_PACKET_LEN;
159 }
160
161 do {
162 retry = JNI_FALSE;
163 n = recvfrom(fd, buf, len, 0, (struct sockaddr *)&sa, &sa_len);
164 if (n < 0) {
165 if (errno == EWOULDBLOCK) {
166 return IOS_UNAVAILABLE;
167 }
168 if (errno == EINTR) {
169 return IOS_INTERRUPTED;
170 }
171 if (errno == ECONNREFUSED) {
172 if (connected == JNI_FALSE) {
173 retry = JNI_TRUE;
174 } else {
175 JNU_ThrowByName(env, JNU_JAVANETPKG
176 "PortUnreachableException", 0);
177 return IOS_THROWN;
178 }
179 } else {
180 return handleSocketError(env, errno);
181 }
182 }
183 } while (retry == JNI_TRUE);
184
185 /*
186 * If the source address and port match the cached address
187 * and port in DatagramChannelImpl then we don't need to
188 * create InetAddress and InetSocketAddress objects.
189 */
190 senderAddr = (*env)->GetObjectField(env, this, dci_senderAddrID);
191 if (senderAddr != NULL) {
192 if (!NET_SockaddrEqualsInetAddress(env, (struct sockaddr *)&sa,
193 senderAddr)) {
194 senderAddr = NULL;
195 } else {
196 jint port = (*env)->GetIntField(env, this, dci_senderPortID);
197 if (port != NET_GetPortFromSockaddr((struct sockaddr *)&sa)) {
198 senderAddr = NULL;
199 }
200 }
201 }
202 if (senderAddr == NULL) {
203 jobject isa = NULL;
204 int port = 0;
205 jobject ia = NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa, &port);
206 if (ia != NULL) {
207 isa = (*env)->NewObject(env, isa_class, isa_ctorID, ia, port);
208 }
209 CHECK_NULL_RETURN(isa, IOS_THROWN);
210
211 (*env)->SetObjectField(env, this, dci_senderAddrID, ia);
212 (*env)->SetIntField(env, this, dci_senderPortID,
213 NET_GetPortFromSockaddr((struct sockaddr *)&sa));
214 (*env)->SetObjectField(env, this, dci_senderID, isa);
215 }
216 return n;
217 }
218
219 JNIEXPORT jint JNICALL
Java_sun_nio_ch_DatagramChannelImpl_send0(JNIEnv * env,jobject this,jboolean preferIPv6,jobject fdo,jlong address,jint len,jobject destAddress,jint destPort)220 Java_sun_nio_ch_DatagramChannelImpl_send0(JNIEnv *env, jobject this,
221 jboolean preferIPv6, jobject fdo, jlong address,
222 jint len, jobject destAddress, jint destPort)
223 {
224 jint fd = fdval(env, fdo);
225 void *buf = (void *)jlong_to_ptr(address);
226 SOCKADDR sa;
227 int sa_len = SOCKADDR_LEN;
228 jint n = 0;
229
230 if (len > MAX_PACKET_LEN) {
231 len = MAX_PACKET_LEN;
232 }
233
234 if (NET_InetAddressToSockaddr(env, destAddress, destPort,
235 (struct sockaddr *)&sa,
236 &sa_len, preferIPv6) != 0) {
237 return IOS_THROWN;
238 }
239
240 n = sendto(fd, buf, len, 0, (struct sockaddr *)&sa, sa_len);
241 if (n < 0) {
242 if (errno == EAGAIN) {
243 return IOS_UNAVAILABLE;
244 }
245 if (errno == EINTR) {
246 return IOS_INTERRUPTED;
247 }
248 if (errno == ECONNREFUSED) {
249 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
250 return IOS_THROWN;
251 }
252 return handleSocketError(env, errno);
253 }
254 return n;
255 }
256