1 /*
2 * Copyright (c) 2001, 2008, 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
56 Java_sun_nio_ch_DatagramChannelImpl_initIDs(JNIEnv *env, jclass clazz)
57 {
58 clazz = (*env)->FindClass(env, "java/net/InetSocketAddress");
59 isa_class = (*env)->NewGlobalRef(env, clazz);
60 isa_ctorID = (*env)->GetMethodID(env, clazz, "<init>",
61 "(Ljava/net/InetAddress;I)V");
62
63 clazz = (*env)->FindClass(env, "sun/nio/ch/DatagramChannelImpl");
64 dci_senderID = (*env)->GetFieldID(env, clazz, "sender",
65 "Ljava/net/SocketAddress;");
66 dci_senderAddrID = (*env)->GetFieldID(env, clazz,
67 "cachedSenderInetAddress",
68 "Ljava/net/InetAddress;");
69 dci_senderPortID = (*env)->GetFieldID(env, clazz,
70 "cachedSenderPort", "I");
71 }
72
73 JNIEXPORT void JNICALL
74 Java_sun_nio_ch_DatagramChannelImpl_disconnect0(JNIEnv *env, jobject this,
75 jobject fdo, jboolean isIPv6)
76 {
77 jint fd = fdval(env, fdo);
78 int rv;
79
80 #ifdef __solaris__
81 rv = connect(fd, 0, 0);
82 #endif
83
84 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
85 {
86 int len;
87 SOCKADDR sa;
88
89 memset(&sa, 0, sizeof(sa));
90
91 #ifdef AF_INET6
92 if (isIPv6) {
93 struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)&sa;
94 #if defined(_ALLBSD_SOURCE)
95 him6->sin6_family = AF_INET6;
96 #else
97 him6->sin6_family = AF_UNSPEC;
98 #endif
99 len = sizeof(struct sockaddr_in6);
100 } else
101 #endif
102 {
103 struct sockaddr_in *him4 = (struct sockaddr_in*)&sa;
104 #if defined(_ALLBSD_SOURCE)
105 him4->sin_family = AF_INET;
106 #else
107 him4->sin_family = AF_UNSPEC;
108 #endif
109 len = sizeof(struct sockaddr_in);
110 }
111
112 rv = connect(fd, (struct sockaddr *)&sa, len);
113
114 #if defined(_ALLBSD_SOURCE)
115 if (rv < 0 && errno == EADDRNOTAVAIL)
116 rv = errno = 0;
117 #endif
118 }
119 #endif
120
121 if (rv < 0)
122 handleSocketError(env, errno);
123
124 }
125
126 JNIEXPORT jint JNICALL
127 Java_sun_nio_ch_DatagramChannelImpl_receive0(JNIEnv *env, jobject this,
128 jobject fdo, jlong address,
129 jint len, jboolean connected)
130 {
131 jint fd = fdval(env, fdo);
132 void *buf = (void *)jlong_to_ptr(address);
133 SOCKADDR sa;
134 socklen_t sa_len = SOCKADDR_LEN;
135 jboolean retry = JNI_FALSE;
136 jint n = 0;
137 jobject senderAddr;
138
139 if (len > MAX_PACKET_LEN) {
140 len = MAX_PACKET_LEN;
141 }
142
143 do {
144 retry = JNI_FALSE;
145 n = recvfrom(fd, buf, len, 0, (struct sockaddr *)&sa, &sa_len);
146 if (n < 0) {
147 if (errno == EWOULDBLOCK) {
148 return IOS_UNAVAILABLE;
149 }
150 if (errno == EINTR) {
151 return IOS_INTERRUPTED;
152 }
153 if (errno == ECONNREFUSED) {
154 if (connected == JNI_FALSE) {
155 retry = JNI_TRUE;
156 } else {
157 JNU_ThrowByName(env, JNU_JAVANETPKG
158 "PortUnreachableException", 0);
159 return IOS_THROWN;
160 }
161 } else {
162 return handleSocketError(env, errno);
163 }
164 }
165 } while (retry == JNI_TRUE);
166
167 /*
168 * If the source address and port match the cached address
169 * and port in DatagramChannelImpl then we don't need to
170 * create InetAddress and InetSocketAddress objects.
171 */
172 senderAddr = (*env)->GetObjectField(env, this, dci_senderAddrID);
173 if (senderAddr != NULL) {
174 if (!NET_SockaddrEqualsInetAddress(env, (struct sockaddr *)&sa,
175 senderAddr)) {
176 senderAddr = NULL;
177 } else {
178 jint port = (*env)->GetIntField(env, this, dci_senderPortID);
179 if (port != NET_GetPortFromSockaddr((struct sockaddr *)&sa)) {
180 senderAddr = NULL;
181 }
182 }
183 }
184 if (senderAddr == NULL) {
185 jobject isa = NULL;
186 int port;
187 jobject ia = NET_SockaddrToInetAddress(env, (struct sockaddr *)&sa,
188 &port);
189
190 if (ia != NULL) {
191 isa = (*env)->NewObject(env, isa_class, isa_ctorID, ia, port);
192 }
193
194 if (isa == NULL) {
195 JNU_ThrowOutOfMemoryError(env, "heap allocation failed");
196 return IOS_THROWN;
197 }
198
199 (*env)->SetObjectField(env, this, dci_senderAddrID, ia);
200 (*env)->SetIntField(env, this, dci_senderPortID,
201 NET_GetPortFromSockaddr((struct sockaddr *)&sa));
202 (*env)->SetObjectField(env, this, dci_senderID, isa);
203 }
204 return n;
205 }
206
207 JNIEXPORT jint JNICALL
208 Java_sun_nio_ch_DatagramChannelImpl_send0(JNIEnv *env, jobject this,
209 jboolean preferIPv6, jobject fdo, jlong address,
210 jint len, jobject destAddress, jint destPort)
211 {
212 jint fd = fdval(env, fdo);
213 void *buf = (void *)jlong_to_ptr(address);
214 SOCKADDR sa;
215 int sa_len = SOCKADDR_LEN;
216 jint n = 0;
217
218 if (len > MAX_PACKET_LEN) {
219 len = MAX_PACKET_LEN;
220 }
221
222 if (NET_InetAddressToSockaddr(env, destAddress, destPort,
223 (struct sockaddr *)&sa,
224 &sa_len, preferIPv6) != 0) {
225 return IOS_THROWN;
226 }
227
228 n = sendto(fd, buf, len, 0, (struct sockaddr *)&sa, sa_len);
229 if (n < 0) {
230 if (errno == EAGAIN) {
231 return IOS_UNAVAILABLE;
232 }
233 if (errno == EINTR) {
234 return IOS_INTERRUPTED;
235 }
236 if (errno == ECONNREFUSED) {
237 JNU_ThrowByName(env, JNU_JAVANETPKG "PortUnreachableException", 0);
238 return IOS_THROWN;
239 }
240 return handleSocketError(env, errno);
241 }
242 return n;
243 }