/* * Copyright (c) 1997, 2012, Oracle and/or its affiliates. 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include #include #include #include #include /* Defines TCP_NODELAY, needed for 2.6 */ #include #include #include #include #include #ifdef __solaris__ #include #include #include #endif #ifdef __linux__ #include #include #include #ifndef IPV6_FLOWINFO_SEND #define IPV6_FLOWINFO_SEND 33 #endif #endif #include "jni_util.h" #include "jvm.h" #include "net_util.h" #include "java_net_SocketOptions.h" /* needed from libsocket on Solaris 8 */ getaddrinfo_f getaddrinfo_ptr = NULL; freeaddrinfo_f freeaddrinfo_ptr = NULL; getnameinfo_f getnameinfo_ptr = NULL; /* * EXCLBIND socket options only on Solaris */ #if defined(__solaris__) && !defined(TCP_EXCLBIND) #define TCP_EXCLBIND 0x21 #endif #if defined(__solaris__) && !defined(UDP_EXCLBIND) #define UDP_EXCLBIND 0x0101 #endif #ifdef __solaris__ static int init_max_buf; static int tcp_max_buf; static int udp_max_buf; static int useExclBind = 0; /* * Get the specified parameter from the specified driver. The value * of the parameter is assumed to be an 'int'. If the parameter * cannot be obtained return the specified default value. */ static int getParam(char *driver, char *param, int dflt) { struct strioctl stri; char buf [64]; int s; int value; s = open (driver, O_RDWR); if (s < 0) { return dflt; } strncpy (buf, param, sizeof(buf)); stri.ic_cmd = ND_GET; stri.ic_timout = 0; stri.ic_dp = buf; stri.ic_len = sizeof(buf); if (ioctl (s, I_STR, &stri) < 0) { value = dflt; } else { value = atoi(buf); } close (s); return value; } #endif #ifdef __linux__ static int kernelV22 = 0; static int vinit = 0; int kernelIsV22 () { if (!vinit) { struct utsname sysinfo; if (uname(&sysinfo) == 0) { sysinfo.release[3] = '\0'; if (strcmp(sysinfo.release, "2.2") == 0) { kernelV22 = JNI_TRUE; } } vinit = 1; } return kernelV22; } static int kernelV24 = 0; static int vinit24 = 0; int kernelIsV24 () { if (!vinit24) { struct utsname sysinfo; if (uname(&sysinfo) == 0) { sysinfo.release[3] = '\0'; if (strcmp(sysinfo.release, "2.4") == 0) { kernelV24 = JNI_TRUE; } } vinit24 = 1; } return kernelV24; } int getScopeID (struct sockaddr *him) { struct sockaddr_in6 *hext = (struct sockaddr_in6 *)him; if (kernelIsV22()) { return 0; } return hext->sin6_scope_id; } int cmpScopeID (unsigned int scope, struct sockaddr *him) { struct sockaddr_in6 *hext = (struct sockaddr_in6 *)him; if (kernelIsV22()) { return 1; /* scope is ignored for comparison in 2.2 kernel */ } return hext->sin6_scope_id == scope; } #else int getScopeID (struct sockaddr *him) { struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him; return him6->sin6_scope_id; } int cmpScopeID (unsigned int scope, struct sockaddr *him) { struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him; return him6->sin6_scope_id == scope; } #endif void NET_ThrowByNameWithLastError(JNIEnv *env, const char *name, const char *defaultDetail) { JNU_ThrowByNameWithMessageAndLastError(env, name, defaultDetail); } void NET_ThrowCurrent(JNIEnv *env, char *msg) { NET_ThrowNew(env, errno, msg); } void NET_ThrowNew(JNIEnv *env, int errorNumber, char *msg) { char fullMsg[512]; if (!msg) { msg = "no further information"; } switch(errorNumber) { case EBADF: jio_snprintf(fullMsg, sizeof(fullMsg), "socket closed: %s", msg); JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", fullMsg); break; case EINTR: JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException", msg); break; default: errno = errorNumber; JNU_ThrowByNameWithLastError(env, JNU_JAVANETPKG "SocketException", msg); break; } } jfieldID NET_GetFileDescriptorID(JNIEnv *env) { jclass cls = (*env)->FindClass(env, "java/io/FileDescriptor"); CHECK_NULL_RETURN(cls, NULL); return (*env)->GetFieldID(env, cls, "fd", "I"); } jint IPv6_supported() { #ifndef AF_INET6 return JNI_FALSE; #endif #ifdef AF_INET6 int fd; void *ipv6_fn; SOCKADDR sa; socklen_t sa_len = sizeof(sa); fd = JVM_Socket(AF_INET6, SOCK_STREAM, 0) ; if (fd < 0) { /* * TODO: We really cant tell since it may be an unrelated error * for now we will assume that AF_INET6 is not available */ return JNI_FALSE; } /* * If fd 0 is a socket it means we've been launched from inetd or * xinetd. If it's a socket then check the family - if it's an * IPv4 socket then we need to disable IPv6. */ if (getsockname(0, (struct sockaddr *)&sa, &sa_len) == 0) { struct sockaddr *saP = (struct sockaddr *)&sa; if (saP->sa_family != AF_INET6) { return JNI_FALSE; } } /** * Linux - check if any interface has an IPv6 address. * Don't need to parse the line - we just need an indication. */ #ifdef __linux__ { FILE *fP = fopen("/proc/net/if_inet6", "r"); char buf[255]; char *bufP; if (fP == NULL) { close(fd); return JNI_FALSE; } bufP = fgets(buf, sizeof(buf), fP); fclose(fP); if (bufP == NULL) { close(fd); return JNI_FALSE; } } #endif /** * On Solaris 8 it's possible to create INET6 sockets even * though IPv6 is not enabled on all interfaces. Thus we * query the number of IPv6 addresses to verify that IPv6 * has been configured on at least one interface. * * On Linux it doesn't matter - if IPv6 is built-in the * kernel then IPv6 addresses will be bound automatically * to all interfaces. */ #ifdef __solaris__ #ifdef SIOCGLIFNUM { struct lifnum numifs; numifs.lifn_family = AF_INET6; numifs.lifn_flags = 0; if (ioctl(fd, SIOCGLIFNUM, (char *)&numifs) < 0) { /** * SIOCGLIFNUM failed - assume IPv6 not configured */ close(fd); return JNI_FALSE; } /** * If no IPv6 addresses then return false. If count > 0 * it's possible that all IPv6 addresses are "down" but * that's okay as they may be brought "up" while the * VM is running. */ if (numifs.lifn_count == 0) { close(fd); return JNI_FALSE; } } #else /* SIOCGLIFNUM not defined in build environment ??? */ close(fd); return JNI_FALSE; #endif #endif /* __solaris */ #endif /* AF_INET6 */ /* * OK we may have the stack available in the kernel, * we should also check if the APIs are available. */ ipv6_fn = JVM_FindLibraryEntry(RTLD_DEFAULT, "inet_pton"); if (ipv6_fn == NULL ) { close(fd); return JNI_FALSE; } /* * We've got the library, let's get the pointers to some * IPV6 specific functions. We have to do that because, at least * on Solaris we may build on a system without IPV6 networking * libraries, therefore we can't have a hard link to these * functions. */ getaddrinfo_ptr = (getaddrinfo_f) JVM_FindLibraryEntry(RTLD_DEFAULT, "getaddrinfo"); freeaddrinfo_ptr = (freeaddrinfo_f) JVM_FindLibraryEntry(RTLD_DEFAULT, "freeaddrinfo"); getnameinfo_ptr = (getnameinfo_f) JVM_FindLibraryEntry(RTLD_DEFAULT, "getnameinfo"); if (freeaddrinfo_ptr == NULL || getnameinfo_ptr == NULL) { /* Wee need all 3 of them */ getaddrinfo_ptr = NULL; } close(fd); return JNI_TRUE; } void NET_AllocSockaddr(struct sockaddr **him, int *len) { #ifdef AF_INET6 if (ipv6_available()) { struct sockaddr_in6 *him6 = (struct sockaddr_in6*)malloc(sizeof(struct sockaddr_in6)); *him = (struct sockaddr*)him6; *len = sizeof(struct sockaddr_in6); } else #endif /* AF_INET6 */ { struct sockaddr_in *him4 = (struct sockaddr_in*)malloc(sizeof(struct sockaddr_in)); *him = (struct sockaddr*)him4; *len = sizeof(struct sockaddr_in); } } #if defined(__linux__) && defined(AF_INET6) /* following code creates a list of addresses from the kernel * routing table that are routed via the loopback address. * We check all destination addresses against this table * and override the scope_id field to use the relevant value for "lo" * in order to work-around the Linux bug that prevents packets destined * for certain local addresses from being sent via a physical interface. */ struct loopback_route { struct in6_addr addr; /* destination address */ int plen; /* prefix length */ }; static struct loopback_route *loRoutes = 0; static int nRoutes = 0; /* number of routes */ static int loRoutes_size = 16; /* initial size */ static int lo_scope_id = 0; static void initLoopbackRoutes(); void printAddr (struct in6_addr *addr) { int i; for (i=0; i<16; i++) { printf ("%02x", addr->s6_addr[i]); } printf ("\n"); } static jboolean needsLoopbackRoute (struct in6_addr* dest_addr) { int byte_count; int extra_bits, i; struct loopback_route *ptr; if (loRoutes == 0) { initLoopbackRoutes(); } for (ptr = loRoutes, i=0; iaddr; int dest_plen = ptr->plen; byte_count = dest_plen >> 3; extra_bits = dest_plen & 0x3; if (byte_count > 0) { if (memcmp(target_addr, dest_addr, byte_count)) { continue; /* no match */ } } if (extra_bits > 0) { unsigned char c1 = ((unsigned char *)target_addr)[byte_count]; unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count]; unsigned char mask = 0xff << (8 - extra_bits); if ((c1 & mask) != (c2 & mask)) { continue; } } return JNI_TRUE; } return JNI_FALSE; } static void initLoopbackRoutes() { FILE *f; char srcp[8][5]; char hopp[8][5]; int dest_plen, src_plen, use, refcnt, metric; unsigned long flags; char dest_str[40]; struct in6_addr dest_addr; char device[16]; if (loRoutes != 0) { free (loRoutes); } loRoutes = calloc (loRoutes_size, sizeof(struct loopback_route)); if (loRoutes == 0) { return; } /* * Scan /proc/net/ipv6_route looking for a matching * route. */ if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) { return ; } while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x " "%4s%4s%4s%4s%4s%4s%4s%4s %02x " "%4s%4s%4s%4s%4s%4s%4s%4s " "%08x %08x %08x %08lx %8s", dest_str, &dest_str[5], &dest_str[10], &dest_str[15], &dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35], &dest_plen, srcp[0], srcp[1], srcp[2], srcp[3], srcp[4], srcp[5], srcp[6], srcp[7], &src_plen, hopp[0], hopp[1], hopp[2], hopp[3], hopp[4], hopp[5], hopp[6], hopp[7], &metric, &use, &refcnt, &flags, device) == 31) { /* * Some routes should be ignored */ if ( (dest_plen < 0 || dest_plen > 128) || (src_plen != 0) || (flags & (RTF_POLICY | RTF_FLOW)) || ((flags & RTF_REJECT) && dest_plen == 0) ) { continue; } /* * Convert the destination address */ dest_str[4] = ':'; dest_str[9] = ':'; dest_str[14] = ':'; dest_str[19] = ':'; dest_str[24] = ':'; dest_str[29] = ':'; dest_str[34] = ':'; dest_str[39] = '\0'; if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) { /* not an Ipv6 address */ continue; } if (strcmp(device, "lo") != 0) { /* Not a loopback route */ continue; } else { if (nRoutes == loRoutes_size) { loRoutes = realloc (loRoutes, loRoutes_size * sizeof (struct loopback_route) * 2); if (loRoutes == 0) { return ; } loRoutes_size *= 2; } memcpy (&loRoutes[nRoutes].addr,&dest_addr,sizeof(struct in6_addr)); loRoutes[nRoutes].plen = dest_plen; nRoutes ++; } } fclose (f); { /* now find the scope_id for "lo" */ char devname[21]; char addr6p[8][5]; int plen, scope, dad_status, if_idx; if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) { while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n", addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4], addr6p[5], addr6p[6], addr6p[7], &if_idx, &plen, &scope, &dad_status, devname) == 13) { if (strcmp(devname, "lo") == 0) { /* * Found - so just return the index */ fclose(f); lo_scope_id = if_idx; return; } } fclose(f); } } } /* * Following is used for binding to local addresses. Equivalent * to code above, for bind(). */ struct localinterface { int index; char localaddr [16]; }; static struct localinterface *localifs = 0; static int localifsSize = 0; /* size of array */ static int nifs = 0; /* number of entries used in array */ /* not thread safe: make sure called once from one thread */ static void initLocalIfs () { FILE *f; unsigned char staddr [16]; char ifname [33]; struct localinterface *lif=0; int index, x1, x2, x3; unsigned int u0,u1,u2,u3,u4,u5,u6,u7,u8,u9,ua,ub,uc,ud,ue,uf; if ((f = fopen("/proc/net/if_inet6", "r")) == NULL) { return ; } while (fscanf (f, "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x " "%d %x %x %x %32s",&u0,&u1,&u2,&u3,&u4,&u5,&u6,&u7, &u8,&u9,&ua,&ub,&uc,&ud,&ue,&uf, &index, &x1, &x2, &x3, ifname) == 21) { staddr[0] = (unsigned char)u0; staddr[1] = (unsigned char)u1; staddr[2] = (unsigned char)u2; staddr[3] = (unsigned char)u3; staddr[4] = (unsigned char)u4; staddr[5] = (unsigned char)u5; staddr[6] = (unsigned char)u6; staddr[7] = (unsigned char)u7; staddr[8] = (unsigned char)u8; staddr[9] = (unsigned char)u9; staddr[10] = (unsigned char)ua; staddr[11] = (unsigned char)ub; staddr[12] = (unsigned char)uc; staddr[13] = (unsigned char)ud; staddr[14] = (unsigned char)ue; staddr[15] = (unsigned char)uf; nifs ++; if (nifs > localifsSize) { localifs = (struct localinterface *) realloc ( localifs, sizeof (struct localinterface)* (localifsSize+5)); if (localifs == 0) { nifs = 0; fclose (f); return; } lif = localifs + localifsSize; localifsSize += 5; } else { lif ++; } memcpy (lif->localaddr, staddr, 16); lif->index = index; } fclose (f); } /* return the scope_id (interface index) of the * interface corresponding to the given address * returns 0 if no match found */ static int getLocalScopeID (char *addr) { struct localinterface *lif; int i; if (localifs == 0) { initLocalIfs(); } for (i=0, lif=localifs; ilocaladdr, 16) == 0) { return lif->index; } } return 0; } void initLocalAddrTable () { initLoopbackRoutes(); initLocalIfs(); } #else void initLocalAddrTable () {} #endif void parseExclusiveBindProperty(JNIEnv *env) { #ifdef __solaris__ jstring s, flagSet; jclass iCls; jmethodID mid; s = (*env)->NewStringUTF(env, "sun.net.useExclusiveBind"); CHECK_NULL(s); iCls = (*env)->FindClass(env, "java/lang/System"); CHECK_NULL(iCls); mid = (*env)->GetStaticMethodID(env, iCls, "getProperty", "(Ljava/lang/String;)Ljava/lang/String;"); CHECK_NULL(mid); flagSet = (*env)->CallStaticObjectMethod(env, iCls, mid, s); if (flagSet != NULL) { useExclBind = 1; } #endif } /* In the case of an IPv4 Inetaddress this method will return an * IPv4 mapped address where IPv6 is available and v4MappedAddress is TRUE. * Otherwise it will return a sockaddr_in structure for an IPv4 InetAddress. */ JNIEXPORT int JNICALL NET_InetAddressToSockaddr(JNIEnv *env, jobject iaObj, int port, struct sockaddr *him, int *len, jboolean v4MappedAddress) { jint family; family = getInetAddress_family(env, iaObj); #ifdef AF_INET6 /* needs work. 1. family 2. clean up him6 etc deallocate memory */ if (ipv6_available() && !(family == IPv4 && v4MappedAddress == JNI_FALSE)) { struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him; jbyte caddr[16]; jint address; if (family == IPv4) { /* will convert to IPv4-mapped address */ memset((char *) caddr, 0, 16); address = getInetAddress_addr(env, iaObj); if (address == INADDR_ANY) { /* we would always prefer IPv6 wildcard address caddr[10] = 0xff; caddr[11] = 0xff; */ } else { caddr[10] = 0xff; caddr[11] = 0xff; caddr[12] = ((address >> 24) & 0xff); caddr[13] = ((address >> 16) & 0xff); caddr[14] = ((address >> 8) & 0xff); caddr[15] = (address & 0xff); } } else { getInet6Address_ipaddress(env, iaObj, (char *)caddr); } memset((char *)him6, 0, sizeof(struct sockaddr_in6)); him6->sin6_port = htons(port); memcpy((void *)&(him6->sin6_addr), caddr, sizeof(struct in6_addr) ); him6->sin6_family = AF_INET6; *len = sizeof(struct sockaddr_in6) ; /* * On Linux if we are connecting to a link-local address * we need to specify the interface in the scope_id (2.4 kernel only) * * If the scope was cached the we use the cached value. If not cached but * specified in the Inet6Address we use that, but we first check if the * address needs to be routed via the loopback interface. In this case, * we override the specified value with that of the loopback interface. * If no cached value exists and no value was specified by user, then * we try to determine a value ffrom the routing table. In all these * cases the used value is cached for further use. */ #ifdef __linux__ if (IN6_IS_ADDR_LINKLOCAL(&(him6->sin6_addr))) { int cached_scope_id = 0, scope_id = 0; int old_kernel = kernelIsV22(); if (ia6_cachedscopeidID && !old_kernel) { cached_scope_id = (int)(*env)->GetIntField(env, iaObj, ia6_cachedscopeidID); /* if cached value exists then use it. Otherwise, check * if scope is set in the address. */ if (!cached_scope_id) { if (ia6_scopeidID) { scope_id = getInet6Address_scopeid(env, iaObj); } if (scope_id != 0) { /* check user-specified value for loopback case * that needs to be overridden */ if (kernelIsV24() && needsLoopbackRoute (&him6->sin6_addr)) { cached_scope_id = lo_scope_id; (*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id); } } else { /* * Otherwise consult the IPv6 routing tables to * try determine the appropriate interface. */ if (kernelIsV24()) { cached_scope_id = getDefaultIPv6Interface( &(him6->sin6_addr) ); } else { cached_scope_id = getLocalScopeID( (char *)&(him6->sin6_addr) ); if (cached_scope_id == 0) { cached_scope_id = getDefaultIPv6Interface( &(him6->sin6_addr) ); } } (*env)->SetIntField(env, iaObj, ia6_cachedscopeidID, cached_scope_id); } } } /* * If we have a scope_id use the extended form * of sockaddr_in6. */ if (!old_kernel) { struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him; him6->sin6_scope_id = cached_scope_id != 0 ? cached_scope_id : scope_id; *len = sizeof(struct sockaddr_in6); } } #else /* handle scope_id for solaris */ if (family != IPv4) { if (ia6_scopeidID) { him6->sin6_scope_id = getInet6Address_scopeid(env, iaObj); } } #endif } else #endif /* AF_INET6 */ { struct sockaddr_in *him4 = (struct sockaddr_in*)him; jint address; if (family == IPv6) { JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Protocol family unavailable"); return -1; } memset((char *) him4, 0, sizeof(struct sockaddr_in)); address = getInetAddress_addr(env, iaObj); him4->sin_port = htons((short) port); him4->sin_addr.s_addr = (uint32_t) htonl(address); him4->sin_family = AF_INET; *len = sizeof(struct sockaddr_in); } return 0; } void NET_SetTrafficClass(struct sockaddr *him, int trafficClass) { #ifdef AF_INET6 if (him->sa_family == AF_INET6) { struct sockaddr_in6 *him6 = (struct sockaddr_in6 *)him; him6->sin6_flowinfo = htonl((trafficClass & 0xff) << 20); } #endif /* AF_INET6 */ } jint NET_GetPortFromSockaddr(struct sockaddr *him) { #ifdef AF_INET6 if (him->sa_family == AF_INET6) { return ntohs(((struct sockaddr_in6*)him)->sin6_port); } else #endif /* AF_INET6 */ { return ntohs(((struct sockaddr_in*)him)->sin_port); } } int NET_IsIPv4Mapped(jbyte* caddr) { int i; for (i = 0; i < 10; i++) { if (caddr[i] != 0x00) { return 0; /* false */ } } if (((caddr[10] & 0xff) == 0xff) && ((caddr[11] & 0xff) == 0xff)) { return 1; /* true */ } return 0; /* false */ } int NET_IPv4MappedToIPv4(jbyte* caddr) { return ((caddr[12] & 0xff) << 24) | ((caddr[13] & 0xff) << 16) | ((caddr[14] & 0xff) << 8) | (caddr[15] & 0xff); } int NET_IsEqual(jbyte* caddr1, jbyte* caddr2) { int i; for (i = 0; i < 16; i++) { if (caddr1[i] != caddr2[i]) { return 0; /* false */ } } return 1; } jboolean NET_addrtransAvailable() { return (jboolean)(getaddrinfo_ptr != NULL); } /* * Map the Java level socket option to the platform specific * level and option name. */ int NET_MapSocketOption(jint cmd, int *level, int *optname) { static struct { jint cmd; int level; int optname; } const opts[] = { { java_net_SocketOptions_TCP_NODELAY, IPPROTO_TCP, TCP_NODELAY }, { java_net_SocketOptions_SO_OOBINLINE, SOL_SOCKET, SO_OOBINLINE }, { java_net_SocketOptions_SO_LINGER, SOL_SOCKET, SO_LINGER }, { java_net_SocketOptions_SO_SNDBUF, SOL_SOCKET, SO_SNDBUF }, { java_net_SocketOptions_SO_RCVBUF, SOL_SOCKET, SO_RCVBUF }, { java_net_SocketOptions_SO_KEEPALIVE, SOL_SOCKET, SO_KEEPALIVE }, { java_net_SocketOptions_SO_REUSEADDR, SOL_SOCKET, SO_REUSEADDR }, { java_net_SocketOptions_SO_BROADCAST, SOL_SOCKET, SO_BROADCAST }, { java_net_SocketOptions_IP_TOS, IPPROTO_IP, IP_TOS }, { java_net_SocketOptions_IP_MULTICAST_IF, IPPROTO_IP, IP_MULTICAST_IF }, { java_net_SocketOptions_IP_MULTICAST_IF2, IPPROTO_IP, IP_MULTICAST_IF }, { java_net_SocketOptions_IP_MULTICAST_LOOP, IPPROTO_IP, IP_MULTICAST_LOOP }, }; int i; /* * Different multicast options if IPv6 is enabled */ #ifdef AF_INET6 if (ipv6_available()) { switch (cmd) { case java_net_SocketOptions_IP_MULTICAST_IF: case java_net_SocketOptions_IP_MULTICAST_IF2: *level = IPPROTO_IPV6; *optname = IPV6_MULTICAST_IF; return 0; case java_net_SocketOptions_IP_MULTICAST_LOOP: *level = IPPROTO_IPV6; *optname = IPV6_MULTICAST_LOOP; return 0; } } #endif /* * Map the Java level option to the native level */ for (i=0; i<(int)(sizeof(opts) / sizeof(opts[0])); i++) { if (cmd == opts[i].cmd) { *level = opts[i].level; *optname = opts[i].optname; return 0; } } /* not found */ return -1; } /* * Determine the default interface for an IPv6 address. * * 1. Scans /proc/net/ipv6_route for a matching route * (eg: fe80::/10 or a route for the specific address). * This will tell us the interface to use (eg: "eth0"). * * 2. Lookup /proc/net/if_inet6 to map the interface * name to an interface index. * * Returns :- * -1 if error * 0 if no matching interface * >1 interface index to use for the link-local address. */ #if defined(__linux__) && defined(AF_INET6) int getDefaultIPv6Interface(struct in6_addr *target_addr) { FILE *f; char srcp[8][5]; char hopp[8][5]; int dest_plen, src_plen, use, refcnt, metric; unsigned long flags; char dest_str[40]; struct in6_addr dest_addr; char device[16]; jboolean match = JNI_FALSE; /* * Scan /proc/net/ipv6_route looking for a matching * route. */ if ((f = fopen("/proc/net/ipv6_route", "r")) == NULL) { return -1; } while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x " "%4s%4s%4s%4s%4s%4s%4s%4s %02x " "%4s%4s%4s%4s%4s%4s%4s%4s " "%08x %08x %08x %08lx %8s", dest_str, &dest_str[5], &dest_str[10], &dest_str[15], &dest_str[20], &dest_str[25], &dest_str[30], &dest_str[35], &dest_plen, srcp[0], srcp[1], srcp[2], srcp[3], srcp[4], srcp[5], srcp[6], srcp[7], &src_plen, hopp[0], hopp[1], hopp[2], hopp[3], hopp[4], hopp[5], hopp[6], hopp[7], &metric, &use, &refcnt, &flags, device) == 31) { /* * Some routes should be ignored */ if ( (dest_plen < 0 || dest_plen > 128) || (src_plen != 0) || (flags & (RTF_POLICY | RTF_FLOW)) || ((flags & RTF_REJECT) && dest_plen == 0) ) { continue; } /* * Convert the destination address */ dest_str[4] = ':'; dest_str[9] = ':'; dest_str[14] = ':'; dest_str[19] = ':'; dest_str[24] = ':'; dest_str[29] = ':'; dest_str[34] = ':'; dest_str[39] = '\0'; if (inet_pton(AF_INET6, dest_str, &dest_addr) < 0) { /* not an Ipv6 address */ continue; } else { /* * The prefix len (dest_plen) indicates the number of bits we * need to match on. * * dest_plen / 8 => number of bytes to match * dest_plen % 8 => number of additional bits to match * * eg: fe80::/10 => match 1 byte + 2 additional bits in the * the next byte. */ int byte_count = dest_plen >> 3; int extra_bits = dest_plen & 0x3; if (byte_count > 0) { if (memcmp(target_addr, &dest_addr, byte_count)) { continue; /* no match */ } } if (extra_bits > 0) { unsigned char c1 = ((unsigned char *)target_addr)[byte_count]; unsigned char c2 = ((unsigned char *)&dest_addr)[byte_count]; unsigned char mask = 0xff << (8 - extra_bits); if ((c1 & mask) != (c2 & mask)) { continue; } } /* * We have a match */ match = JNI_TRUE; break; } } fclose(f); /* * If there's a match then we lookup the interface * index. */ if (match) { char devname[21]; char addr6p[8][5]; int plen, scope, dad_status, if_idx; if ((f = fopen("/proc/net/if_inet6", "r")) != NULL) { while (fscanf(f, "%4s%4s%4s%4s%4s%4s%4s%4s %02x %02x %02x %02x %20s\n", addr6p[0], addr6p[1], addr6p[2], addr6p[3], addr6p[4], addr6p[5], addr6p[6], addr6p[7], &if_idx, &plen, &scope, &dad_status, devname) == 13) { if (strcmp(devname, device) == 0) { /* * Found - so just return the index */ fclose(f); return if_idx; } } fclose(f); } else { /* * Couldn't open /proc/net/if_inet6 */ return -1; } } /* * If we get here it means we didn't there wasn't any * route or we couldn't get the index of the interface. */ return 0; } #endif /* * Wrapper for getsockopt system routine - does any necessary * pre/post processing to deal with OS specific oddies :- * * IP_TOS is a no-op with IPv6 sockets as it's setup when * the connection is established. * * On Linux the SO_SNDBUF/SO_RCVBUF values must be post-processed * to compensate for an incorrect value returned by the kernel. */ int NET_GetSockOpt(int fd, int level, int opt, void *result, int *len) { int rv; #ifdef AF_INET6 if ((level == IPPROTO_IP) && (opt == IP_TOS)) { if (ipv6_available()) { /* * For IPv6 socket option implemented at Java-level * so return -1. */ int *tc = (int *)result; *tc = -1; return 0; } } #endif #ifdef __solaris__ rv = getsockopt(fd, level, opt, result, len); #else { socklen_t socklen = *len; rv = getsockopt(fd, level, opt, result, &socklen); *len = socklen; } #endif if (rv < 0) { return rv; } #ifdef __linux__ /* * On Linux SO_SNDBUF/SO_RCVBUF aren't symmetric. This * stems from additional socket structures in the send * and receive buffers. */ if ((level == SOL_SOCKET) && ((opt == SO_SNDBUF) || (opt == SO_RCVBUF))) { int n = *((int *)result); n /= 2; *((int *)result) = n; } #endif return rv; } /* * Wrapper for setsockopt system routine - performs any * necessary pre/post processing to deal with OS specific * issue :- * * On Solaris need to limit the suggested value for SO_SNDBUF * and SO_RCVBUF to the kernel configured limit * * For IP_TOS socket option need to mask off bits as this * aren't automatically masked by the kernel and results in * an error. In addition IP_TOS is a noop with IPv6 as it * should be setup as connection time. */ int NET_SetSockOpt(int fd, int level, int opt, const void *arg, int len) { #ifndef IPTOS_TOS_MASK #define IPTOS_TOS_MASK 0x1e #endif #ifndef IPTOS_PREC_MASK #define IPTOS_PREC_MASK 0xe0 #endif /* * IPPROTO/IP_TOS :- * 1. IPv6 on Solaris: no-op and will be set in flowinfo * field when connecting TCP socket, or sending * UDP packet. * 2. IPv6 on Linux: By default Linux ignores flowinfo * field so enable IPV6_FLOWINFO_SEND so that flowinfo * will be examined. * 3. IPv4: set socket option based on ToS and Precedence * fields (otherwise get invalid argument) */ if (level == IPPROTO_IP && opt == IP_TOS) { int *iptos; #if defined(AF_INET6) && defined(__solaris__) if (ipv6_available()) { return 0; } #endif #if defined(AF_INET6) && defined(__linux__) if (ipv6_available()) { int optval = 1; return setsockopt(fd, IPPROTO_IPV6, IPV6_FLOWINFO_SEND, (void *)&optval, sizeof(optval)); } #endif iptos = (int *)arg; *iptos &= (IPTOS_TOS_MASK | IPTOS_PREC_MASK); } /* * SOL_SOCKET/{SO_SNDBUF,SO_RCVBUF} - On Solaris need to * ensure that value is <= max_buf as otherwise we get * an invalid argument. */ #ifdef __solaris__ if (level == SOL_SOCKET) { if (opt == SO_SNDBUF || opt == SO_RCVBUF) { int sotype, arglen; int *bufsize, maxbuf; if (!init_max_buf) { tcp_max_buf = getParam("/dev/tcp", "tcp_max_buf", 64*1024); udp_max_buf = getParam("/dev/udp", "udp_max_buf", 64*1024); init_max_buf = 1; } arglen = sizeof(sotype); if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *)&sotype, &arglen) < 0) { return -1; } maxbuf = (sotype == SOCK_STREAM) ? tcp_max_buf : udp_max_buf; bufsize = (int *)arg; if (*bufsize > maxbuf) { *bufsize = maxbuf; } } } #endif /* * On Linux the receive buffer is used for both socket * structures and the the packet payload. The implication * is that if SO_RCVBUF is too small then small packets * must be discard. */ #ifdef __linux__ if (level == SOL_SOCKET && opt == SO_RCVBUF) { int *bufsize = (int *)arg; if (*bufsize < 1024) { *bufsize = 1024; } } #endif return setsockopt(fd, level, opt, arg, len); } /* * Wrapper for bind system call - performs any necessary pre/post * processing to deal with OS specific issues :- * * Linux allows a socket to bind to 127.0.0.255 which must be * caught. * * On Solaris with IPv6 enabled we must use an exclusive * bind to guarantee a unique port number across the IPv4 and * IPv6 port spaces. * */ int NET_Bind(int fd, struct sockaddr *him, int len) { #if defined(__solaris__) && defined(AF_INET6) int level = -1; int exclbind = -1; #endif int rv; int arg, alen; #ifdef __linux__ /* * ## get bugId for this issue - goes back to 1.2.2 port ## * ## When IPv6 is enabled this will be an IPv4-mapped * ## with family set to AF_INET6 */ if (him->sa_family == AF_INET) { struct sockaddr_in *sa = (struct sockaddr_in *)him; if ((ntohl(sa->sin_addr.s_addr) & 0x7f0000ff) == 0x7f0000ff) { errno = EADDRNOTAVAIL; return -1; } } #endif #if defined(__solaris__) /* * Solaris has separate IPv4 and IPv6 port spaces so we * use an exclusive bind when SO_REUSEADDR is not used to * give the illusion of a unified port space. * This also avoids problems with IPv6 sockets connecting * to IPv4 mapped addresses whereby the socket conversion * results in a late bind that fails because the * corresponding IPv4 port is in use. */ alen = sizeof(arg); if (useExclBind || getsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&arg, &alen) == 0) { if (useExclBind || arg == 0) { /* * SO_REUSEADDR is disabled or sun.net.useExclusiveBind * property is true so enable TCP_EXCLBIND or * UDP_EXCLBIND */ alen = sizeof(arg); if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&arg, &alen) == 0) { if (arg == SOCK_STREAM) { level = IPPROTO_TCP; exclbind = TCP_EXCLBIND; } else { level = IPPROTO_UDP; exclbind = UDP_EXCLBIND; } } arg = 1; setsockopt(fd, level, exclbind, (char *)&arg, sizeof(arg)); } } #endif rv = bind(fd, him, len); #if defined(__solaris__) && defined(AF_INET6) if (rv < 0) { int en = errno; /* Restore *_EXCLBIND if the bind fails */ if (exclbind != -1) { int arg = 0; setsockopt(fd, level, exclbind, (char *)&arg, sizeof(arg)); } errno = en; } #endif return rv; } /** * Wrapper for select/poll with timeout on a single file descriptor. * * flags (defined in net_util_md.h can be any combination of * NET_WAIT_READ, NET_WAIT_WRITE & NET_WAIT_CONNECT. * * The function will return when either the socket is ready for one * of the specified operation or the timeout expired. * * It returns the time left from the timeout, or -1 if it expired. */ jint NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout) { jlong prevTime = JVM_CurrentTimeMillis(env, 0); jint read_rv; while (1) { jlong newTime; #ifndef USE_SELECT { struct pollfd pfd; pfd.fd = fd; pfd.events = 0; if (flags & NET_WAIT_READ) pfd.events |= POLLIN; if (flags & NET_WAIT_WRITE) pfd.events |= POLLOUT; if (flags & NET_WAIT_CONNECT) pfd.events |= POLLOUT; errno = 0; read_rv = NET_Poll(&pfd, 1, timeout); } #else { fd_set rd, wr, ex; struct timeval t; t.tv_sec = timeout / 1000; t.tv_usec = (timeout % 1000) * 1000; FD_ZERO(&rd); FD_ZERO(&wr); FD_ZERO(&ex); if (flags & NET_WAIT_READ) { FD_SET(fd, &rd); } if (flags & NET_WAIT_WRITE) { FD_SET(fd, &wr); } if (flags & NET_WAIT_CONNECT) { FD_SET(fd, &wr); FD_SET(fd, &ex); } errno = 0; read_rv = NET_Select(fd+1, &rd, &wr, &ex, &t); } #endif if (read_rv > 0) { break; } newTime = JVM_CurrentTimeMillis(env, 0); timeout -= (newTime - prevTime); if (timeout <= 0) { return read_rv > 0 ? 0 : -1; } newTime = prevTime; if (read_rv > 0) { break; } } /* while */ return timeout; }