1 /*
2 * Copyright (c) 1997, 2018, 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 #include <dlfcn.h>
26 #include <errno.h>
27 #include <net/if.h>
28 #include <netinet/tcp.h> // defines TCP_NODELAY
29 #include <stdlib.h>
30 #include <string.h>
31 #include <sys/ioctl.h>
32 #include <sys/time.h>
33
34 #if defined(__linux__)
35 #include <arpa/inet.h>
36 #include <net/route.h>
37 #include <sys/utsname.h>
38 #endif
39
40 #if defined(__solaris__)
41 #include <inet/nd.h>
42 #include <limits.h>
43 #include <stropts.h>
44 #include <sys/filio.h>
45 #include <sys/sockio.h>
46 #endif
47
48 #if defined(MACOSX)
49 #include <sys/sysctl.h>
50 #endif
51
52 #include "jvm.h"
53 #include "net_util.h"
54
55 #include "java_net_SocketOptions.h"
56 #include "java_net_InetAddress.h"
57
58 #if defined(__linux__) && !defined(IPV6_FLOWINFO_SEND)
59 #define IPV6_FLOWINFO_SEND 33
60 #endif
61
62 #if defined(__solaris__) && !defined(MAXINT)
63 #define MAXINT INT_MAX
64 #endif
65
66 /*
67 * EXCLBIND socket options only on Solaris
68 */
69 #if defined(__solaris__) && !defined(TCP_EXCLBIND)
70 #define TCP_EXCLBIND 0x21
71 #endif
72 #if defined(__solaris__) && !defined(UDP_EXCLBIND)
73 #define UDP_EXCLBIND 0x0101
74 #endif
75
76 void setDefaultScopeID(JNIEnv *env, struct sockaddr *him)
77 {
78 #ifdef MACOSX
79 static jclass ni_class = NULL;
80 static jfieldID ni_defaultIndexID;
81 if (ni_class == NULL) {
82 jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
83 CHECK_NULL(c);
84 c = (*env)->NewGlobalRef(env, c);
85 CHECK_NULL(c);
86 ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
87 CHECK_NULL(ni_defaultIndexID);
88 ni_class = c;
89 }
90 int defaultIndex;
91 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)him;
92 if (sin6->sin6_family == AF_INET6 && (sin6->sin6_scope_id == 0) &&
93 (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
94 IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))) {
95 defaultIndex = (*env)->GetStaticIntField(env, ni_class,
96 ni_defaultIndexID);
97 sin6->sin6_scope_id = defaultIndex;
98 }
99 #endif
100 }
101
102 int getDefaultScopeID(JNIEnv *env) {
103 int defaultIndex = 0;
104 static jclass ni_class = NULL;
105 static jfieldID ni_defaultIndexID;
106 if (ni_class == NULL) {
107 jclass c = (*env)->FindClass(env, "java/net/NetworkInterface");
108 CHECK_NULL_RETURN(c, 0);
109 c = (*env)->NewGlobalRef(env, c);
110 CHECK_NULL_RETURN(c, 0);
111 ni_defaultIndexID = (*env)->GetStaticFieldID(env, c, "defaultIndex", "I");
112 CHECK_NULL_RETURN(ni_defaultIndexID, 0);
113 ni_class = c;
114 }
115 defaultIndex = (*env)->GetStaticIntField(env, ni_class,
116 ni_defaultIndexID);
117 return defaultIndex;
118 }
119
120 #define RESTARTABLE(_cmd, _result) do { \
121 do { \
122 _result = _cmd; \
123 } while((_result == -1) && (errno == EINTR)); \
124 } while(0)
125
126 int NET_SocketAvailable(int s, jint *pbytes) {
127 int result;
128 RESTARTABLE(ioctl(s, FIONREAD, pbytes), result);
129 // note: ioctl can return 0 when successful, NET_SocketAvailable
130 // is expected to return 0 on failure and 1 on success.
131 return (result == -1) ? 0 : 1;
132 }
133
134 #ifdef __solaris__
135 static int init_tcp_max_buf, init_udp_max_buf;
136 static int tcp_max_buf;
137 static int udp_max_buf;
138 static int useExclBind = 0;
139
140 /*
141 * Get the specified parameter from the specified driver. The value
142 * of the parameter is assumed to be an 'int'. If the parameter
143 * cannot be obtained return -1
144 */
145 int net_getParam(char *driver, char *param)
146 {
147 struct strioctl stri;
148 char buf [64];
149 int s;
150 int value;
151
152 s = open (driver, O_RDWR);
153 if (s < 0) {
154 return -1;
155 }
156 strncpy (buf, param, sizeof(buf));
157 stri.ic_cmd = ND_GET;
158 stri.ic_timout = 0;
159 stri.ic_dp = buf;
160 stri.ic_len = sizeof(buf);
161 if (ioctl (s, I_STR, &stri) < 0) {
162 value = -1;
163 } else {
164 value = atoi(buf);
165 }
166 close (s);
167 return value;
168 }
169
170 /*
171 * Iterative way to find the max value that SO_SNDBUF or SO_RCVBUF
172 * for Solaris versions that do not support the ioctl() in net_getParam().
173 * Ugly, but only called once (for each sotype).
174 *
175 * As an optimization, we make a guess using the default values for Solaris
176 * assuming they haven't been modified with ndd.
177 */
178
179 #define MAX_TCP_GUESS 1024 * 1024
180 #define MAX_UDP_GUESS 2 * 1024 * 1024
181
182 #define FAIL_IF_NOT_ENOBUFS if (errno != ENOBUFS) return -1
183
184 static int findMaxBuf(int fd, int opt, int sotype) {
185 int a = 0;
186 int b = MAXINT;
187 int initial_guess;
188 int limit = -1;
189
190 if (sotype == SOCK_DGRAM) {
191 initial_guess = MAX_UDP_GUESS;
192 } else {
193 initial_guess = MAX_TCP_GUESS;
194 }
195
196 if (setsockopt(fd, SOL_SOCKET, opt, &initial_guess, sizeof(int)) == 0) {
197 initial_guess++;
198 if (setsockopt(fd, SOL_SOCKET, opt, &initial_guess,sizeof(int)) < 0) {
199 FAIL_IF_NOT_ENOBUFS;
200 return initial_guess - 1;
201 }
202 a = initial_guess;
203 } else {
204 FAIL_IF_NOT_ENOBUFS;
205 b = initial_guess - 1;
206 }
207 do {
208 int mid = a + (b-a)/2;
209 if (setsockopt(fd, SOL_SOCKET, opt, &mid, sizeof(int)) == 0) {
210 limit = mid;
211 a = mid + 1;
212 } else {
213 FAIL_IF_NOT_ENOBUFS;
214 b = mid - 1;
215 }
216 } while (b >= a);
217
218 return limit;
219 }
220 #endif
221
222 #ifdef __linux__
223 static int vinit = 0;
224 static int kernelV24 = 0;
225 static int vinit24 = 0;
226
227 int kernelIsV24 () {
228 if (!vinit24) {
229 struct utsname sysinfo;
230 if (uname(&sysinfo) == 0) {
231 sysinfo.release[3] = '\0';
232 if (strcmp(sysinfo.release, "2.4") == 0) {
233 kernelV24 = JNI_TRUE;
234 }
235 }
236 vinit24 = 1;
237 }
238 return kernelV24;
239 }
240 #endif
241
242 void
243 NET_ThrowByNameWithLastError(JNIEnv *env, const char *name,
244 const char *defaultDetail) {
245 JNU_ThrowByNameWithMessageAndLastError(env, name, defaultDetail);
246 }
247
248 void
249 NET_ThrowCurrent(JNIEnv *env, char *msg) {
250 NET_ThrowNew(env, errno, msg);
251 }
252
253 void
254 NET_ThrowNew(JNIEnv *env, int errorNumber, char *msg) {
255 char fullMsg[512];
256 if (!msg) {
257 msg = "no further information";
258 }
259 switch(errorNumber) {
260 case EBADF:
261 jio_snprintf(fullMsg, sizeof(fullMsg), "socket closed: %s", msg);
262 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", fullMsg);
263 break;
264 case EINTR:
265 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", msg);
266 break;
267 default:
268 errno = errorNumber;
269 JNU_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", msg);
270 break;
271 }
272 }
273
274
275 jfieldID
276 NET_GetFileDescriptorID(JNIEnv *env)
277 {
278 jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor");
279 CHECK_NULL_RETURN(cls, NULL);
280 return (*env)->GetFieldID(env, cls, "fd", "I");
281 }
282
283 #if defined(DONT_ENABLE_IPV6)
284 jint IPv6_supported()
285 {
286 return JNI_FALSE;
287 }
288
289 #else /* !DONT_ENABLE_IPV6 */
290
291 jint IPv6_supported()
292 {
293 int fd;
294 void *ipv6_fn;
295 SOCKETADDRESS sa;
296 socklen_t sa_len = sizeof(SOCKETADDRESS);
297
298 fd = socket(AF_INET6, SOCK_STREAM, 0) ;
299 if (fd < 0) {
300 /*
301 * TODO: We really cant tell since it may be an unrelated error
302 * for now we will assume that AF_INET6 is not available
303 */
304 return JNI_FALSE;
305 }
306
307 /*
308 * If fd 0 is a socket it means we've been launched from inetd or
309 * xinetd. If it's a socket then check the family - if it's an
310 * IPv4 socket then we need to disable IPv6.
311 */
312 if (getsockname(0, &sa.sa, &sa_len) == 0) {
313 if (sa.sa.sa_family != AF_INET6) {
314 close(fd);
315 return JNI_FALSE;
316 }
317 }
318
319 /**
320 * Linux - check if any interface has an IPv6 address.
321 * Don't need to parse the line - we just need an indication.
322 */
323 #ifdef __linux__
324 {
325 FILE *fP = fopen("/proc/net/if_inet6", "r");
326 char buf[255];
327 char *bufP;
328
329 if (fP == NULL) {
330 close(fd);
331 return JNI_FALSE;
332 }
333 bufP = fgets(buf, sizeof(buf), fP);
334 fclose(fP);
335 if (bufP == NULL) {
336 close(fd);
337 return JNI_FALSE;
338 }
339 }
340 #endif
341
342 /**
343 * On Solaris 8 it's possible to create INET6 sockets even
344 * though IPv6 is not enabled on all interfaces. Thus we
345 * query the number of IPv6 addresses to verify that IPv6
346 * has been configured on at least one interface.
347 *
348 * On Linux it doesn't matter - if IPv6 is built-in the
349 * kernel then IPv6 addresses will be bound automatically
350 * to all interfaces.
351 */
352 #ifdef __solaris__
353
354 #ifdef SIOCGLIFNUM
355 {
356 struct lifnum numifs;
357
358 numifs.lifn_family = AF_INET6;
359 numifs.lifn_flags = 0;
360 if (ioctl(fd, SIOCGLIFNUM, (char *)&numifs) < 0) {
361 /**
362 * SIOCGLIFNUM failed - assume IPv6 not configured
363 */
364 close(fd);
365 return JNI_FALSE;
366 }
367 /**
368 * If no IPv6 addresses then return false. If count > 0
369 * it's possible that all IPv6 addresses are "down" but
370 * that's okay as they may be brought "up" while the
371 * VM is running.
372 */
373 if (numifs.lifn_count == 0) {
374 close(fd);
375 return JNI_FALSE;
376 }
377 }
378 #else
379 /* SIOCGLIFNUM not defined in build environment ??? */
380 close(fd);
381 return JNI_FALSE;
382 #endif
383
384 #endif /* __solaris */
385
386 /*
387 * OK we may have the stack available in the kernel,
388 * we should also check if the APIs are available.
389 */
390 ipv6_fn = JVM_FindLibraryEntry(RTLD_DEFAULT, "inet_pton");
391 close(fd);
392 if (ipv6_fn == NULL ) {
393 return JNI_FALSE;
394 } else {
395 return JNI_TRUE;
396 }
397 }
398 #endif /* DONT_ENABLE_IPV6 */
399
400 jint reuseport_supported()
401 {
402 /* Do a simple dummy call, and try to figure out from that */
403 int one = 1;
404 int rv, s;
405 s = socket(PF_INET, SOCK_STREAM, 0);
406 if (s < 0) {
407 return JNI_FALSE;
408 }
409 rv = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, (void *)&one, sizeof(one));
410 if (rv != 0) {
411 rv = JNI_FALSE;
412 } else {
413 rv = JNI_TRUE;
414 }
415 close(s);
416 return rv;
417 }
418
419 void NET_ThrowUnknownHostExceptionWithGaiError(JNIEnv *env,
420 const char* hostname,
421 int gai_error)
422 {
423 int size;
424 char *buf;
425 const char *format = "%s: %s";
426 const char *error_string = gai_strerror(gai_error);
427 if (error_string == NULL)
428 error_string = "unknown error";
429
430 size = strlen(format) + strlen(hostname) + strlen(error_string) + 2;
431 buf = (char *) malloc(size);
432 if (buf) {
433 jstring s;
434 sprintf(buf, format, hostname, error_string);
435 s = JNU_NewStringPlatform(env, buf);
436 if (s != NULL) {
437 jobject x = JNU_NewObjectByName(env,
438 "java/net/UnknownHostException",
439 "(Ljava/lang/String;)V", s);
440 if (x != NULL)
441 (*env)->Throw(env, x);
442 }
443 free(buf);
444 }
445 }
446
447 #if defined(__linux__)
448
449 /* following code creates a list of addresses from the kernel
450 * routing table that are routed via the loopback address.
451 * We check all destination addresses against this table
452 * and override the scope_id field to use the relevant value for "lo"
453 * in order to work-around the Linux bug that prevents packets destined
454 * for certain local addresses from being sent via a physical interface.
455 */
456
457 struct loopback_route {
458 struct in6_addr addr; /* destination address */
459 int plen; /* prefix length */
460 };
461
462 static struct loopback_route *loRoutes = 0;
463 static int nRoutes = 0; /* number of routes */
464 static int loRoutes_size = 16; /* initial size */
465 static int lo_scope_id = 0;
466
467 static void initLoopbackRoutes();
468
469 void printAddr (struct in6_addr *addr) {
470 int i;
471 for (i=0; i<16; i++) {
472 printf ("%02x", addr->s6_addr[i]);
473 }
474 printf ("\n");
475 }
476
477 static jboolean needsLoopbackRoute (struct in6_addr* dest_addr) {
478 int byte_count;
479 int extra_bits, i;
480 struct loopback_route *ptr;
481
482 if (loRoutes == 0) {
483 initLoopbackRoutes();
484 }
485
486 for (ptr = loRoutes, i=0; i<nRoutes; i++, ptr++) {
487 struct in6_addr *target_addr=&ptr->addr;
488 int dest_plen = ptr->plen;
489 byte_count = dest_plen >> 3;
490 extra_bits = dest_plen & 0x3;
491
492 if (byte_count > 0) {
493 if (memcmp(target_addr, dest_addr, byte_count)) {
494 continue; /* no match */
495 }
496 }
497
498 if (extra_bits > 0) {
499 unsigned char c1 = ((unsigned char *)target_addr)[byte_count];
500 unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count];
501 unsigned char mask = 0xff << (8 - extra_bits);
502 if ((c1 & mask) != (c2 & mask)) {
503 continue;
504 }
505 }
506 return JNI_TRUE;
507 }
508 return JNI_FALSE;
509 }
510
511
512 static void initLoopbackRoutes() {
513 FILE *f;
514 char srcp[8][5];
515 char hopp[8][5];
516 int dest_plen, src_plen, use, refcnt, metric;
517 unsigned long flags;
518 char dest_str[40];
519 struct in6_addr dest_addr;
520 char device[16];
521 struct loopback_route *loRoutesTemp;
522
523 if (loRoutes != 0) {
524 free (loRoutes);
525 }
526 loRoutes = calloc (loRoutes_size, sizeof(struct loopback_route));
527 if (loRoutes == 0) {
528 return;
529 }
530 /*
531 * Scan /proc/net/ipv6_route looking for a matching
532 * route.
533 */
534 if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) {
535 return ;
536 }
537 while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
538 "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
539 "%4s%4s%4s%4s%4s%4s%4s%4s "
540 "%08x %08x %08x %08lx %8s",
541 dest_str, &dest_str[5], &dest_str[10], &dest_str[15],
542 &dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35],
543 &dest_plen,
544 srcp[0], srcp[1], srcp[2], srcp[3],
545 srcp[4], srcp[5], srcp[6], srcp[7],
546 &src_plen,
547 hopp[0], hopp[1], hopp[2], hopp[3],
548 hopp[4], hopp[5], hopp[6], hopp[7],
549 &metric, &use, &refcnt, &flags, device) == 31) {
550
551 /*
552 * Some routes should be ignored
553 */
554 if ( (dest_plen < 0 || dest_plen > 128) ||
555 (src_plen != 0) ||
556 (flags & (RTF_POLICY | RTF_FLOW)) ||
557 ((flags & RTF_REJECT) && dest_plen == 0) ) {
558 continue;
559 }
560
561 /*
562 * Convert the destination address
563 */
564 dest_str[4] = ':';
565 dest_str[9] = ':';
566 dest_str[14] = ':';
567 dest_str[19] = ':';
568 dest_str[24] = ':';
569 dest_str[29] = ':';
570 dest_str[34] = ':';
571 dest_str[39] = '\0';
572
573 if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) {
574 /* not an Ipv6 address */
575 continue;
576 }
577 if (strcmp(device, "lo") != 0) {
578 /* Not a loopback route */
579 continue;
580 } else {
581 if (nRoutes == loRoutes_size) {
582 loRoutesTemp = realloc (loRoutes, loRoutes_size *
583 sizeof (struct loopback_route) * 2);
584
585 if (loRoutesTemp == 0) {
586 free(loRoutes);
587 fclose (f);
588 return;
589 }
590 loRoutes=loRoutesTemp;
591 loRoutes_size *= 2;
592 }
593 memcpy (&loRoutes[nRoutes].addr,&dest_addr,sizeof(struct in6_addr));
594 loRoutes[nRoutes].plen = dest_plen;
595 nRoutes ++;
596 }
597 }
598
599 fclose (f);
600 {
601 /* now find the scope_id for "lo" */
602
603 char devname[21];
604 char addr6p[8][5];
605 int plen, scope, dad_status, if_idx;
606
607 if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) {
608 while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
609 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
610 addr6p[4], addr6p[5], addr6p[6], addr6p[7],
611 &if_idx, &plen, &scope, &dad_status, devname) == 13) {
612
613 if (strcmp(devname, "lo") == 0) {
614 /*
615 * Found - so just return the index
616 */
617 fclose(f);
618 lo_scope_id = if_idx;
619 return;
620 }
621 }
622 fclose(f);
623 }
624 }
625 }
626
627 /*
628 * Following is used for binding to local addresses. Equivalent
629 * to code above, for bind().
630 */
631
632 struct localinterface {
633 int index;
634 char localaddr [16];
635 };
636
637 static struct localinterface *localifs = 0;
638 static int localifsSize = 0; /* size of array */
639 static int nifs = 0; /* number of entries used in array */
640
641 /* not thread safe: make sure called once from one thread */
642
643 static void initLocalIfs () {
644 FILE *f;
645 unsigned char staddr [16];
646 char ifname [33];
647 struct localinterface *lif=0;
648 int index, x1, x2, x3;
649 unsigned int u0,u1,u2,u3,u4,u5,u6,u7,u8,u9,ua,ub,uc,ud,ue,uf;
650
651 if ((f = fopen("/proc/net/if_inet6", "r")) == NULL) {
652 return ;
653 }
654 while (fscanf (f, "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x "
655 "%d %x %x %x %32s",&u0,&u1,&u2,&u3,&u4,&u5,&u6,&u7,
656 &u8,&u9,&ua,&ub,&uc,&ud,&ue,&uf,
657 &index, &x1, &x2, &x3, ifname) == 21) {
658 staddr[0] = (unsigned char)u0;
659 staddr[1] = (unsigned char)u1;
660 staddr[2] = (unsigned char)u2;
661 staddr[3] = (unsigned char)u3;
662 staddr[4] = (unsigned char)u4;
663 staddr[5] = (unsigned char)u5;
664 staddr[6] = (unsigned char)u6;
665 staddr[7] = (unsigned char)u7;
666 staddr[8] = (unsigned char)u8;
667 staddr[9] = (unsigned char)u9;
668 staddr[10] = (unsigned char)ua;
669 staddr[11] = (unsigned char)ub;
670 staddr[12] = (unsigned char)uc;
671 staddr[13] = (unsigned char)ud;
672 staddr[14] = (unsigned char)ue;
673 staddr[15] = (unsigned char)uf;
674 nifs ++;
675 if (nifs > localifsSize) {
676 localifs = (struct localinterface *) realloc (
677 localifs, sizeof (struct localinterface)* (localifsSize+5));
678 if (localifs == 0) {
679 nifs = 0;
680 fclose (f);
681 return;
682 }
683 lif = localifs + localifsSize;
684 localifsSize += 5;
685 } else {
686 lif ++;
687 }
688 memcpy (lif->localaddr, staddr, 16);
689 lif->index = index;
690 }
691 fclose (f);
692 }
693
694 /* return the scope_id (interface index) of the
695 * interface corresponding to the given address
696 * returns 0 if no match found
697 */
698
699 static int getLocalScopeID (char *addr) {
700 struct localinterface *lif;
701 int i;
702 if (localifs == 0) {
703 initLocalIfs();
704 }
705 for (i=0, lif=localifs; i<nifs; i++, lif++) {
706 if (memcmp (addr, lif->localaddr, 16) == 0) {
707 return lif->index;
708 }
709 }
710 return 0;
711 }
712
713 void platformInit () {
714 initLoopbackRoutes();
715 initLocalIfs();
716 }
717
718 #elif defined(_AIX)
719
720 /* Initialize stubs for blocking I/O workarounds (see src/solaris/native/java/net/linux_close.c) */
721 extern void aix_close_init();
722
723 void platformInit () {
724 aix_close_init();
725 }
726
727 #else
728
729 void platformInit () {}
730
731 #endif
732
733 void parseExclusiveBindProperty(JNIEnv *env) {
734 #ifdef __solaris__
735 jstring s, flagSet;
736 jclass iCls;
737 jmethodID mid;
738
739 s = (*env)->NewStringUTF(env, "sun.net.useExclusiveBind");
740 CHECK_NULL(s);
741 iCls = (*env)->FindClass(env, "java/lang/System");
742 CHECK_NULL(iCls);
743 mid = (*env)->GetStaticMethodID(env, iCls, "getProperty",
744 "(Ljava/lang/String;)Ljava/lang/String;");
745 CHECK_NULL(mid);
746 flagSet = (*env)->CallStaticObjectMethod(env, iCls, mid, s);
747 if (flagSet != NULL) {
748 useExclBind = 1;
749 }
750 #endif
751 }
752
753 JNIEXPORT jint JNICALL
754 NET_EnableFastTcpLoopback(int fd) {
755 return 0;
756 }
757
758 /**
759 * See net_util.h for documentation
760 */
761 JNIEXPORT int JNICALL
762 NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port,
763 SOCKETADDRESS *sa, int *len,
764 jboolean v4MappedAddress)
765 {
766 jint family = getInetAddress_family(env, iaObj);
767 JNU_CHECK_EXCEPTION_RETURN(env, -1);
768 memset((char *)sa, 0, sizeof(SOCKETADDRESS));
769
770 if (ipv6_available() &&
771 !(family == java_net_InetAddress_IPv4 &&
772 v4MappedAddress == JNI_FALSE))
773 {
774 jbyte caddr[16];
775 jint address;
776
777 if (family == java_net_InetAddress_IPv4) {
778 // convert to IPv4-mapped address
779 memset((char *)caddr, 0, 16);
780 address = getInetAddress_addr(env, iaObj);
781 JNU_CHECK_EXCEPTION_RETURN(env, -1);
782 if (address == INADDR_ANY) {
783 /* we would always prefer IPv6 wildcard address
784 * caddr[10] = 0xff;
785 * caddr[11] = 0xff; */
786 } else {
787 caddr[10] = 0xff;
788 caddr[11] = 0xff;
789 caddr[12] = ((address >> 24) & 0xff);
790 caddr[13] = ((address >> 16) & 0xff);
791 caddr[14] = ((address >> 8) & 0xff);
792 caddr[15] = (address & 0xff);
793 }
794 } else {
795 getInet6Address_ipaddress(env, iaObj, (char *)caddr);
796 }
797 sa->sa6.sin6_port = htons(port);
798 memcpy((void *)&sa->sa6.sin6_addr, caddr, sizeof(struct in6_addr));
799 sa->sa6.sin6_family = AF_INET6;
800 if (len != NULL) {
801 *len = sizeof(struct sockaddr_in6);
802 }
803
804 #ifdef __linux__
805 /*
806 * On Linux if we are connecting to a
807 *
808 * - link-local address
809 * - multicast interface-local or link-local address
810 *
811 * we need to specify the interface in the scope_id.
812 *
813 * If the scope was cached then we use the cached value. If not cached but
814 * specified in the Inet6Address we use that, but we first check if the
815 * address needs to be routed via the loopback interface. In this case,
816 * we override the specified value with that of the loopback interface.
817 * If no cached value exists and no value was specified by user, then
818 * we try to determine a value from the routing table. In all these
819 * cases the used value is cached for further use.
820 */
821 if (IN6_IS_ADDR_LINKLOCAL(&sa->sa6.sin6_addr)
822 || IN6_IS_ADDR_MC_NODELOCAL(&sa->sa6.sin6_addr)
823 || IN6_IS_ADDR_MC_LINKLOCAL(&sa->sa6.sin6_addr)) {
824 unsigned int cached_scope_id = 0, scope_id = 0;
825
826 if (ia6_cachedscopeidID) {
827 cached_scope_id = (int)(*env)->GetIntField(env, iaObj, ia6_cachedscopeidID);
828 /* if cached value exists then use it. Otherwise, check
829 * if scope is set in the address.
830 */
831 if (!cached_scope_id) {
832 if (ia6_scopeidID) {
833 scope_id = getInet6Address_scopeid(env, iaObj);
834 }
835 if (scope_id != 0) {
836 /* check user-specified value for loopback case
837 * that needs to be overridden
838 */
839 if (kernelIsV24() && needsLoopbackRoute(&sa->sa6.sin6_addr)) {
840 cached_scope_id = lo_scope_id;
841 (*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id);
842 }
843 } else {
844 /*
845 * Otherwise consult the IPv6 routing tables to
846 * try determine the appropriate interface.
847 */
848 if (kernelIsV24()) {
849 cached_scope_id = getDefaultIPv6Interface(&sa->sa6.sin6_addr);
850 } else {
851 cached_scope_id = getLocalScopeID((char *)&(sa->sa6.sin6_addr));
852 if (cached_scope_id == 0) {
853 cached_scope_id = getDefaultIPv6Interface(&sa->sa6.sin6_addr);
854 }
855 }
856 (*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id);
857 }
858 }
859 }
860
861 /*
862 * If we have a scope_id use the extended form
863 * of sockaddr_in6.
864 */
865 sa->sa6.sin6_scope_id = cached_scope_id == 0 ? scope_id : cached_scope_id;
866 }
867 #else
868 /* handle scope_id */
869 if (family != java_net_InetAddress_IPv4) {
870 if (ia6_scopeidID) {
871 sa->sa6.sin6_scope_id = getInet6Address_scopeid(env, iaObj);
872 }
873 }
874 #endif
875 } else {
876 jint address;
877 if (family != java_net_InetAddress_IPv4) {
878 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Protocol family unavailable");
879 return -1;
880 }
881 address = getInetAddress_addr(env, iaObj);
882 JNU_CHECK_EXCEPTION_RETURN(env, -1);
883 sa->sa4.sin_port = htons(port);
884 sa->sa4.sin_addr.s_addr = htonl(address);
885 sa->sa4.sin_family = AF_INET;
886 if (len != NULL) {
887 *len = sizeof(struct sockaddr_in);
888 }
889 }
890 return 0;
891 }
892
893 void
894 NET_SetTrafficClass(SOCKETADDRESS *sa, int trafficClass) {
895 if (sa->sa.sa_family == AF_INET6) {
896 sa->sa6.sin6_flowinfo = htonl((trafficClass & 0xff) << 20);
897 }
898 }
899
900 int
901 NET_IsIPv4Mapped(jbyte* caddr) {
902 int i;
903 for (i = 0; i < 10; i++) {
904 if (caddr[i] != 0x00) {
905 return 0; /* false */
906 }
907 }
908
909 if (((caddr[10] & 0xff) == 0xff) && ((caddr[11] & 0xff) == 0xff)) {
910 return 1; /* true */
911 }
912 return 0; /* false */
913 }
914
915 int
916 NET_IPv4MappedToIPv4(jbyte* caddr) {
917 return ((caddr[12] & 0xff) << 24) | ((caddr[13] & 0xff) << 16) | ((caddr[14] & 0xff) << 8)
918 | (caddr[15] & 0xff);
919 }
920
921 int
922 NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
923 int i;
924 for (i = 0; i < 16; i++) {
925 if (caddr1[i] != caddr2[i]) {
926 return 0; /* false */
927 }
928 }
929 return 1;
930 }
931
932 int NET_IsZeroAddr(jbyte* caddr) {
933 int i;
934 for (i = 0; i < 16; i++) {
935 if (caddr[i] != 0) {
936 return 0;
937 }
938 }
939 return 1;
940 }
941
942 /*
943 * Map the Java level socket option to the platform specific
944 * level and option name.
945 */
946 int
947 NET_MapSocketOption(jint cmd, int *level, int *optname) {
948 static struct {
949 jint cmd;
950 int level;
951 int optname;
952 } const opts[] = {
953 { java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY },
954 { java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE },
955 { java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER },
956 { java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF },
957 { java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF },
958 { java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE },
959 { java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR },
960 { java_net_SocketOptions_SO_REUSEPORT, SOL_SOCKET, SO_REUSEPORT },
961 { java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST },
962 { java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS },
963 { java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF },
964 { java_net_SocketOptions_IP_MULTICAST_IF2, IPPROTO_IP, IP_MULTICAST_IF },
965 { java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP },
966 };
967
968 int i;
969
970 if (ipv6_available()) {
971 switch (cmd) {
972 // Different multicast options if IPv6 is enabled
973 case java_net_SocketOptions_IP_MULTICAST_IF:
974 case java_net_SocketOptions_IP_MULTICAST_IF2:
975 *level = IPPROTO_IPV6;
976 *optname = IPV6_MULTICAST_IF;
977 return 0;
978
979 case java_net_SocketOptions_IP_MULTICAST_LOOP:
980 *level = IPPROTO_IPV6;
981 *optname = IPV6_MULTICAST_LOOP;
982 return 0;
983 #if (defined(__solaris__) || defined(MACOSX))
984 // Map IP_TOS request to IPV6_TCLASS
985 case java_net_SocketOptions_IP_TOS:
986 *level = IPPROTO_IPV6;
987 *optname = IPV6_TCLASS;
988 return 0;
989 #endif
990 }
991 }
992
993 /*
994 * Map the Java level option to the native level
995 */
996 for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) {
997 if (cmd == opts[i].cmd) {
998 *level = opts[i].level;
999 *optname = opts[i].optname;
1000 return 0;
1001 }
1002 }
1003
1004 /* not found */
1005 return -1;
1006 }
1007
1008 /*
1009 * Determine the default interface for an IPv6 address.
1010 *
1011 * 1. Scans /proc/net/ipv6_route for a matching route
1012 * (eg: fe80::/10 or a route for the specific address).
1013 * This will tell us the interface to use (eg: "eth0").
1014 *
1015 * 2. Lookup /proc/net/if_inet6 to map the interface
1016 * name to an interface index.
1017 *
1018 * Returns :-
1019 * -1 if error
1020 * 0 if no matching interface
1021 * >1 interface index to use for the link-local address.
1022 */
1023 #if defined(__linux__)
1024 int getDefaultIPv6Interface(struct in6_addr *target_addr) {
1025 FILE *f;
1026 char srcp[8][5];
1027 char hopp[8][5];
1028 int dest_plen, src_plen, use, refcnt, metric;
1029 unsigned long flags;
1030 char dest_str[40];
1031 struct in6_addr dest_addr;
1032 char device[16];
1033 jboolean match = JNI_FALSE;
1034
1035 /*
1036 * Scan /proc/net/ipv6_route looking for a matching
1037 * route.
1038 */
1039 if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) {
1040 return -1;
1041 }
1042 while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
1043 "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
1044 "%4s%4s%4s%4s%4s%4s%4s%4s "
1045 "%08x %08x %08x %08lx %8s",
1046 dest_str, &dest_str[5], &dest_str[10], &dest_str[15],
1047 &dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35],
1048 &dest_plen,
1049 srcp[0], srcp[1], srcp[2], srcp[3],
1050 srcp[4], srcp[5], srcp[6], srcp[7],
1051 &src_plen,
1052 hopp[0], hopp[1], hopp[2], hopp[3],
1053 hopp[4], hopp[5], hopp[6], hopp[7],
1054 &metric, &use, &refcnt, &flags, device) == 31) {
1055
1056 /*
1057 * Some routes should be ignored
1058 */
1059 if ( (dest_plen < 0 || dest_plen > 128) ||
1060 (src_plen != 0) ||
1061 (flags & (RTF_POLICY | RTF_FLOW)) ||
1062 ((flags & RTF_REJECT) && dest_plen == 0) ) {
1063 continue;
1064 }
1065
1066 /*
1067 * Convert the destination address
1068 */
1069 dest_str[4] = ':';
1070 dest_str[9] = ':';
1071 dest_str[14] = ':';
1072 dest_str[19] = ':';
1073 dest_str[24] = ':';
1074 dest_str[29] = ':';
1075 dest_str[34] = ':';
1076 dest_str[39] = '\0';
1077
1078 if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) {
1079 /* not an Ipv6 address */
1080 continue;
1081 } else {
1082 /*
1083 * The prefix len (dest_plen) indicates the number of bits we
1084 * need to match on.
1085 *
1086 * dest_plen / 8 => number of bytes to match
1087 * dest_plen % 8 => number of additional bits to match
1088 *
1089 * eg: fe80::/10 => match 1 byte + 2 additional bits in the
1090 * next byte.
1091 */
1092 int byte_count = dest_plen >> 3;
1093 int extra_bits = dest_plen & 0x3;
1094
1095 if (byte_count > 0) {
1096 if (memcmp(target_addr, &dest_addr, byte_count)) {
1097 continue; /* no match */
1098 }
1099 }
1100
1101 if (extra_bits > 0) {
1102 unsigned char c1 = ((unsigned char *)target_addr)[byte_count];
1103 unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count];
1104 unsigned char mask = 0xff << (8 - extra_bits);
1105 if ((c1 & mask) != (c2 & mask)) {
1106 continue;
1107 }
1108 }
1109
1110 /*
1111 * We have a match
1112 */
1113 match = JNI_TRUE;
1114 break;
1115 }
1116 }
1117 fclose(f);
1118
1119 /*
1120 * If there's a match then we lookup the interface
1121 * index.
1122 */
1123 if (match) {
1124 char devname[21];
1125 char addr6p[8][5];
1126 int plen, scope, dad_status, if_idx;
1127
1128 if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) {
1129 while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %08x %02x %02x %02x %20s\n",
1130 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
1131 addr6p[4], addr6p[5], addr6p[6], addr6p[7],
1132 &if_idx, &plen, &scope, &dad_status, devname) == 13) {
1133
1134 if (strcmp(devname, device) == 0) {
1135 /*
1136 * Found - so just return the index
1137 */
1138 fclose(f);
1139 return if_idx;
1140 }
1141 }
1142 fclose(f);
1143 } else {
1144 /*
1145 * Couldn't open /proc/net/if_inet6
1146 */
1147 return -1;
1148 }
1149 }
1150
1151 /*
1152 * If we get here it means we didn't there wasn't any
1153 * route or we couldn't get the index of the interface.
1154 */
1155 return 0;
1156 }
1157 #endif
1158
1159
1160 /*
1161 * Wrapper for getsockopt system routine - does any necessary
1162 * pre/post processing to deal with OS specific oddities :-
1163 *
1164 * On Linux the SO_SNDBUF/SO_RCVBUF values must be post-processed
1165 * to compensate for an incorrect value returned by the kernel.
1166 */
1167 int
1168 NET_GetSockOpt(int fd, int level, int opt, void *result,
1169 int *len)
1170 {
1171 int rv;
1172 socklen_t socklen = *len;
1173
1174 rv = getsockopt(fd, level, opt, result, &socklen);
1175 *len = socklen;
1176
1177 if (rv < 0) {
1178 return rv;
1179 }
1180
1181 #ifdef __linux__
1182 /*
1183 * On Linux SO_SNDBUF/SO_RCVBUF aren't symmetric. This
1184 * stems from additional socket structures in the send
1185 * and receive buffers.
1186 */
1187 if ((level == SOL_SOCKET) && ((opt == SO_SNDBUF)
1188 || (opt == SO_RCVBUF))) {
1189 int n = *((int *)result);
1190 n /= 2;
1191 *((int *)result) = n;
1192 }
1193 #endif
1194
1195 /* Workaround for Mac OS treating linger value as
1196 * signed integer
1197 */
1198 #ifdef MACOSX
1199 if (level == SOL_SOCKET && opt == SO_LINGER) {
1200 struct linger* to_cast = (struct linger*)result;
1201 to_cast->l_linger = (unsigned short)to_cast->l_linger;
1202 }
1203 #endif
1204 return rv;
1205 }
1206
1207 /*
1208 * Wrapper for setsockopt system routine - performs any
1209 * necessary pre/post processing to deal with OS specific
1210 * issue :-
1211 *
1212 * On Solaris need to limit the suggested value for SO_SNDBUF
1213 * and SO_RCVBUF to the kernel configured limit
1214 *
1215 * For IP_TOS socket option need to mask off bits as this
1216 * aren't automatically masked by the kernel and results in
1217 * an error.
1218 */
1219 int
1220 NET_SetSockOpt(int fd, int level, int opt, const void *arg,
1221 int len)
1222 {
1223
1224 #ifndef IPTOS_TOS_MASK
1225 #define IPTOS_TOS_MASK 0x1e
1226 #endif
1227 #ifndef IPTOS_PREC_MASK
1228 #define IPTOS_PREC_MASK 0xe0
1229 #endif
1230
1231 #if defined(_ALLBSD_SOURCE)
1232 #if defined(KIPC_MAXSOCKBUF)
1233 int mib[3];
1234 size_t rlen;
1235 #endif
1236
1237 int *bufsize;
1238
1239 #ifdef __APPLE__
1240 static int maxsockbuf = -1;
1241 #else
1242 static long maxsockbuf = -1;
1243 #endif
1244 #endif
1245
1246 /*
1247 * IPPROTO/IP_TOS :-
1248 * 1. IPv6 on Solaris/Mac OS:
1249 * Set the TOS OR Traffic Class value to cater for
1250 * IPv6 and IPv4 scenarios.
1251 * 2. IPv6 on Linux: By default Linux ignores flowinfo
1252 * field so enable IPV6_FLOWINFO_SEND so that flowinfo
1253 * will be examined. We also set the IPv4 TOS option in this case.
1254 * 3. IPv4: set socket option based on ToS and Precedence
1255 * fields (otherwise get invalid argument)
1256 */
1257 if (level == IPPROTO_IP && opt == IP_TOS) {
1258 int *iptos;
1259
1260 #if defined(__linux__)
1261 if (ipv6_available()) {
1262 int optval = 1;
1263 if (setsockopt(fd, IPPROTO_IPV6, IPV6_FLOWINFO_SEND,
1264 (void *)&optval, sizeof(optval)) < 0) {
1265 return -1;
1266 }
1267 /*
1268 * Let's also set the IPV6_TCLASS flag.
1269 * Linux appears to allow both IP_TOS and IPV6_TCLASS to be set
1270 * This helps in mixed environments where IPv4 and IPv6 sockets
1271 * are connecting.
1272 */
1273 if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
1274 arg, len) < 0) {
1275 return -1;
1276 }
1277 }
1278 #endif
1279
1280 iptos = (int *)arg;
1281 *iptos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK);
1282 }
1283
1284 /*
1285 * SOL_SOCKET/{SO_SNDBUF,SO_RCVBUF} - On Solaris we may need to clamp
1286 * the value when it exceeds the system limit.
1287 */
1288 #ifdef __solaris__
1289 if (level == SOL_SOCKET) {
1290 if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
1291 int sotype=0;
1292 socklen_t arglen;
1293 int *bufsize, maxbuf;
1294 int ret;
1295
1296 /* Attempt with the original size */
1297 ret = setsockopt(fd, level, opt, arg, len);
1298 if ((ret == 0) || (ret == -1 && errno != ENOBUFS))
1299 return ret;
1300
1301 /* Exceeded system limit so clamp and retry */
1302
1303 arglen = sizeof(sotype);
1304 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype,
1305 &arglen) < 0) {
1306 return -1;
1307 }
1308
1309 /*
1310 * We try to get tcp_maxbuf (and udp_max_buf) using
1311 * an ioctl() that isn't available on all versions of Solaris.
1312 * If that fails, we use the search algorithm in findMaxBuf()
1313 */
1314 if (!init_tcp_max_buf && sotype == SOCK_STREAM) {
1315 tcp_max_buf = net_getParam("/dev/tcp", "tcp_max_buf");
1316 if (tcp_max_buf == -1) {
1317 tcp_max_buf = findMaxBuf(fd, opt, SOCK_STREAM);
1318 if (tcp_max_buf == -1) {
1319 return -1;
1320 }
1321 }
1322 init_tcp_max_buf = 1;
1323 } else if (!init_udp_max_buf && sotype == SOCK_DGRAM) {
1324 udp_max_buf = net_getParam("/dev/udp", "udp_max_buf");
1325 if (udp_max_buf == -1) {
1326 udp_max_buf = findMaxBuf(fd, opt, SOCK_DGRAM);
1327 if (udp_max_buf == -1) {
1328 return -1;
1329 }
1330 }
1331 init_udp_max_buf = 1;
1332 }
1333
1334 maxbuf = (sotype == SOCK_STREAM) ? tcp_max_buf : udp_max_buf;
1335 bufsize = (int *)arg;
1336 if (*bufsize > maxbuf) {
1337 *bufsize = maxbuf;
1338 }
1339 }
1340 }
1341 #endif
1342
1343 #ifdef _AIX
1344 if (level == SOL_SOCKET) {
1345 if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
1346 /*
1347 * Just try to set the requested size. If it fails we will leave the
1348 * socket option as is. Setting the buffer size means only a hint in
1349 * the jse2/java software layer, see javadoc. In the previous
1350 * solution the buffer has always been truncated to a length of
1351 * 0x100000 Byte, even if the technical limit has not been reached.
1352 * This kind of absolute truncation was unexpected in the jck tests.
1353 */
1354 int ret = setsockopt(fd, level, opt, arg, len);
1355 if ((ret == 0) || (ret == -1 && errno == ENOBUFS)) {
1356 // Accept failure because of insufficient buffer memory resources.
1357 return 0;
1358 } else {
1359 // Deliver all other kinds of errors.
1360 return ret;
1361 }
1362 }
1363 }
1364 #endif
1365
1366 /*
1367 * On Linux the receive buffer is used for both socket
1368 * structures and the packet payload. The implication
1369 * is that if SO_RCVBUF is too small then small packets
1370 * must be discarded.
1371 */
1372 #ifdef __linux__
1373 if (level == SOL_SOCKET && opt == SO_RCVBUF) {
1374 int *bufsize = (int *)arg;
1375 if (*bufsize < 1024) {
1376 *bufsize = 1024;
1377 }
1378 }
1379 #endif
1380
1381 #if defined(_ALLBSD_SOURCE)
1382 /*
1383 * SOL_SOCKET/{SO_SNDBUF,SO_RCVBUF} - On FreeBSD need to
1384 * ensure that value is <= kern.ipc.maxsockbuf as otherwise we get
1385 * an ENOBUFS error.
1386 */
1387 if (level == SOL_SOCKET) {
1388 if (opt == SO_SNDBUF || opt == SO_RCVBUF) {
1389 #ifdef KIPC_MAXSOCKBUF
1390 if (maxsockbuf == -1) {
1391 mib[0] = CTL_KERN;
1392 mib[1] = KERN_IPC;
1393 mib[2] = KIPC_MAXSOCKBUF;
1394 rlen = sizeof(maxsockbuf);
1395 if (sysctl(mib, 3, &maxsockbuf, &rlen, NULL, 0) == -1)
1396 maxsockbuf = 1024;
1397
1398 #if 1
1399 /* XXXBSD: This is a hack to workaround mb_max/mb_max_adj
1400 problem. It should be removed when kern.ipc.maxsockbuf
1401 will be real value. */
1402 maxsockbuf = (maxsockbuf/5)*4;
1403 #endif
1404 }
1405 #elif defined(__OpenBSD__)
1406 maxsockbuf = SB_MAX;
1407 #else
1408 maxsockbuf = 64 * 1024; /* XXX: NetBSD */
1409 #endif
1410
1411 bufsize = (int *)arg;
1412 if (*bufsize > maxsockbuf) {
1413 *bufsize = maxsockbuf;
1414 }
1415
1416 if (opt == SO_RCVBUF && *bufsize < 1024) {
1417 *bufsize = 1024;
1418 }
1419
1420 }
1421 }
1422 #endif
1423
1424 #if defined(_ALLBSD_SOURCE) || defined(_AIX)
1425 /*
1426 * On Solaris, SO_REUSEADDR will allow multiple datagram
1427 * sockets to bind to the same port. The network jck tests check
1428 * for this "feature", so we need to emulate it by turning on
1429 * SO_REUSEPORT as well for that combination.
1430 */
1431 if (level == SOL_SOCKET && opt == SO_REUSEADDR) {
1432 int sotype;
1433 socklen_t arglen;
1434
1435 arglen = sizeof(sotype);
1436 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen) < 0) {
1437 return -1;
1438 }
1439
1440 if (sotype == SOCK_DGRAM) {
1441 setsockopt(fd, level, SO_REUSEPORT, arg, len);
1442 }
1443 }
1444 #endif
1445
1446 return setsockopt(fd, level, opt, arg, len);
1447 }
1448
1449 /*
1450 * Wrapper for bind system call - performs any necessary pre/post
1451 * processing to deal with OS specific issues :-
1452 *
1453 * Linux allows a socket to bind to 127.0.0.255 which must be
1454 * caught.
1455 *
1456 * On Solaris with IPv6 enabled we must use an exclusive
1457 * bind to guarantee a unique port number across the IPv4 and
1458 * IPv6 port spaces.
1459 *
1460 */
1461 int
1462 NET_Bind(int fd, SOCKETADDRESS *sa, int len)
1463 {
1464 #if defined(__solaris__)
1465 int level = -1;
1466 int exclbind = -1;
1467 #endif
1468 int rv;
1469 int arg, alen;
1470
1471 #ifdef __linux__
1472 /*
1473 * ## get bugId for this issue - goes back to 1.2.2 port ##
1474 * ## When IPv6 is enabled this will be an IPv4-mapped
1475 * ## with family set to AF_INET6
1476 */
1477 if (sa->sa.sa_family == AF_INET) {
1478 if ((ntohl(sa->sa4.sin_addr.s_addr) & 0x7f0000ff) == 0x7f0000ff) {
1479 errno = EADDRNOTAVAIL;
1480 return -1;
1481 }
1482 }
1483 #endif
1484
1485 #if defined(__solaris__)
1486 /*
1487 * Solaris has separate IPv4 and IPv6 port spaces so we
1488 * use an exclusive bind when SO_REUSEADDR is not used to
1489 * give the illusion of a unified port space.
1490 * This also avoids problems with IPv6 sockets connecting
1491 * to IPv4 mapped addresses whereby the socket conversion
1492 * results in a late bind that fails because the
1493 * corresponding IPv4 port is in use.
1494 */
1495 alen = sizeof(arg);
1496
1497 if (useExclBind ||
1498 getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&arg, &alen) == 0)
1499 {
1500 if (useExclBind || arg == 0) {
1501 /*
1502 * SO_REUSEADDR is disabled or sun.net.useExclusiveBind
1503 * property is true so enable TCP_EXCLBIND or
1504 * UDP_EXCLBIND
1505 */
1506 alen = sizeof(arg);
1507 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&arg, &alen) == 0)
1508 {
1509 if (arg == SOCK_STREAM) {
1510 level = IPPROTO_TCP;
1511 exclbind = TCP_EXCLBIND;
1512 } else {
1513 level = IPPROTO_UDP;
1514 exclbind = UDP_EXCLBIND;
1515 }
1516 }
1517
1518 arg = 1;
1519 setsockopt(fd, level, exclbind, (char *)&arg, sizeof(arg));
1520 }
1521 }
1522
1523 #endif
1524
1525 rv = bind(fd, &sa->sa, len);
1526
1527 #if defined(__solaris__)
1528 if (rv < 0) {
1529 int en = errno;
1530 /* Restore *_EXCLBIND if the bind fails */
1531 if (exclbind != -1) {
1532 int arg = 0;
1533 setsockopt(fd, level, exclbind, (char *)&arg,
1534 sizeof(arg));
1535 }
1536 errno = en;
1537 }
1538 #endif
1539
1540 return rv;
1541 }
1542
1543 /**
1544 * Wrapper for poll with timeout on a single file descriptor.
1545 *
1546 * flags (defined in net_util_md.h can be any combination of
1547 * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT.
1548 *
1549 * The function will return when either the socket is ready for one
1550 * of the specified operations or the timeout expired.
1551 *
1552 * It returns the time left from the timeout (possibly 0), or -1 if it expired.
1553 */
1554
1555 jint
1556 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
1557 {
1558 jlong prevNanoTime = JVM_NanoTime(env, 0);
1559 jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC;
1560 jint read_rv;
1561
1562 while (1) {
1563 jlong newNanoTime;
1564 struct pollfd pfd;
1565 pfd.fd = fd;
1566 pfd.events = 0;
1567 if (flags & NET_WAIT_READ)
1568 pfd.events |= POLLIN;
1569 if (flags & NET_WAIT_WRITE)
1570 pfd.events |= POLLOUT;
1571 if (flags & NET_WAIT_CONNECT)
1572 pfd.events |= POLLOUT;
1573
1574 errno = 0;
1575 read_rv = NET_Poll(&pfd, 1, nanoTimeout / NET_NSEC_PER_MSEC);
1576
1577 newNanoTime = JVM_NanoTime(env, 0);
1578 nanoTimeout -= (newNanoTime - prevNanoTime);
1579 if (nanoTimeout < NET_NSEC_PER_MSEC) {
1580 return read_rv > 0 ? 0 : -1;
1581 }
1582 prevNanoTime = newNanoTime;
1583
1584 if (read_rv > 0) {
1585 break;
1586 }
1587 } /* while */
1588 return (nanoTimeout / NET_NSEC_PER_MSEC);
1589 }