--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nspr/pr/src/io/pripv6.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,364 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+** File:        pripv6.c
+** Description: Support for various functions unique to IPv6
+*/
+#include "primpl.h"
+#include <string.h>
+
+#if !defined(_PR_INET6) || defined(_PR_INET6_PROBE)
+
+static PRIOMethods ipv6_to_v4_tcpMethods;
+static PRIOMethods ipv6_to_v4_udpMethods;
+static PRDescIdentity _pr_ipv6_to_ipv4_id;
+extern PRBool IsValidNetAddr(const PRNetAddr *addr);
+extern PRIPv6Addr _pr_in6addr_any;
+extern PRIPv6Addr _pr_in6addr_loopback;
+
+/*
+ * convert an IPv4-mapped IPv6 addr to an IPv4 addr
+ */
+static void _PR_ConvertToIpv4NetAddr(const PRNetAddr *src_v6addr,
+											PRNetAddr *dst_v4addr)
+{
+const PRUint8 *srcp;
+
+	PR_ASSERT(PR_AF_INET6 == src_v6addr->ipv6.family);
+
+	if (PR_IsNetAddrType(src_v6addr, PR_IpAddrV4Mapped)) {
+		srcp = src_v6addr->ipv6.ip.pr_s6_addr;
+		memcpy((char *) &dst_v4addr->inet.ip, srcp + 12, 4);
+    } else if (PR_IsNetAddrType(src_v6addr, PR_IpAddrAny)) {
+        dst_v4addr->inet.ip = htonl(INADDR_ANY);
+    } else if (PR_IsNetAddrType(src_v6addr, PR_IpAddrLoopback)) {
+        dst_v4addr->inet.ip = htonl(INADDR_LOOPBACK);
+    }
+	dst_v4addr->inet.family = PR_AF_INET;
+	dst_v4addr->inet.port = src_v6addr->ipv6.port;
+}
+
+/*
+ * convert an IPv4 addr to an IPv4-mapped IPv6 addr
+ */
+static void _PR_ConvertToIpv6NetAddr(const PRNetAddr *src_v4addr,
+                                            PRNetAddr *dst_v6addr)
+{
+PRUint8 *dstp;
+
+	PR_ASSERT(PR_AF_INET == src_v4addr->inet.family);
+	dst_v6addr->ipv6.family = PR_AF_INET6;
+	dst_v6addr->ipv6.port = src_v4addr->inet.port;
+
+ 	if (htonl(INADDR_ANY) == src_v4addr->inet.ip) {
+		dst_v6addr->ipv6.ip = _pr_in6addr_any;
+	} else {
+		dstp = dst_v6addr->ipv6.ip.pr_s6_addr;
+		memset(dstp, 0, 10);
+		memset(dstp + 10, 0xff, 2);
+		memcpy(dstp + 12,(char *) &src_v4addr->inet.ip, 4);
+	}
+}
+
+static PRStatus PR_CALLBACK Ipv6ToIpv4SocketBind(PRFileDesc *fd,
+								const PRNetAddr *addr)
+{
+	PRNetAddr tmp_ipv4addr;
+	const PRNetAddr *tmp_addrp;
+	PRFileDesc *lo = fd->lower;
+
+	if (PR_AF_INET6 != addr->raw.family) {
+        PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, 0);
+		return PR_FAILURE;
+	}
+	if (PR_IsNetAddrType(addr, PR_IpAddrV4Mapped) ||
+    			PR_IsNetAddrType(addr, PR_IpAddrAny)) {
+		_PR_ConvertToIpv4NetAddr(addr, &tmp_ipv4addr);
+		tmp_addrp = &tmp_ipv4addr;
+	} else {
+        PR_SetError(PR_NETWORK_UNREACHABLE_ERROR, 0);
+		return PR_FAILURE;
+	}
+	return((lo->methods->bind)(lo,tmp_addrp));
+}
+
+static PRStatus PR_CALLBACK Ipv6ToIpv4SocketConnect(
+    PRFileDesc *fd, const PRNetAddr *addr, PRIntervalTime timeout)
+{
+	PRNetAddr tmp_ipv4addr;
+	const PRNetAddr *tmp_addrp;
+
+	if (PR_AF_INET6 != addr->raw.family) {
+        PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, 0);
+		return PR_FAILURE;
+	}
+	if (PR_IsNetAddrType(addr, PR_IpAddrV4Mapped) ||
+			PR_IsNetAddrType(addr, PR_IpAddrLoopback)) {
+		_PR_ConvertToIpv4NetAddr(addr, &tmp_ipv4addr);
+		tmp_addrp = &tmp_ipv4addr;
+	} else {
+        PR_SetError(PR_NETWORK_UNREACHABLE_ERROR, 0);
+		return PR_FAILURE;
+	}
+	return (fd->lower->methods->connect)(fd->lower, tmp_addrp, timeout);
+}
+
+static PRInt32 PR_CALLBACK Ipv6ToIpv4SocketSendTo(
+    PRFileDesc *fd, const void *buf, PRInt32 amount,
+    PRIntn flags, const PRNetAddr *addr, PRIntervalTime timeout)
+{
+	PRNetAddr tmp_ipv4addr;
+	const PRNetAddr *tmp_addrp;
+
+	if (PR_AF_INET6 != addr->raw.family) {
+        PR_SetError(PR_ADDRESS_NOT_SUPPORTED_ERROR, 0);
+		return PR_FAILURE;
+	}
+	if (PR_IsNetAddrType(addr, PR_IpAddrV4Mapped) ||
+			PR_IsNetAddrType(addr, PR_IpAddrLoopback)) {
+		_PR_ConvertToIpv4NetAddr(addr, &tmp_ipv4addr);
+		tmp_addrp = &tmp_ipv4addr;
+	} else {
+        PR_SetError(PR_NETWORK_UNREACHABLE_ERROR, 0);
+		return PR_FAILURE;
+	}
+    return (fd->lower->methods->sendto)(
+        fd->lower, buf, amount, flags, tmp_addrp, timeout);
+}
+
+static PRFileDesc* PR_CALLBACK Ipv6ToIpv4SocketAccept (
+    PRFileDesc *fd, PRNetAddr *addr, PRIntervalTime timeout)
+{
+    PRStatus rv;
+    PRFileDesc *newfd;
+    PRFileDesc *newstack;
+	PRNetAddr tmp_ipv4addr;
+    PRNetAddr *addrlower = NULL;
+
+    PR_ASSERT(fd != NULL);
+    PR_ASSERT(fd->lower != NULL);
+
+    newstack = PR_NEW(PRFileDesc);
+    if (NULL == newstack)
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return NULL;
+    }
+    *newstack = *fd;  /* make a copy of the accepting layer */
+
+    if (addr)
+        addrlower = &tmp_ipv4addr;
+    newfd = (fd->lower->methods->accept)(fd->lower, addrlower, timeout);
+    if (NULL == newfd)
+    {
+        PR_DELETE(newstack);
+        return NULL;
+    }
+    if (addr)
+        _PR_ConvertToIpv6NetAddr(&tmp_ipv4addr, addr);
+
+    rv = PR_PushIOLayer(newfd, PR_TOP_IO_LAYER, newstack);
+    PR_ASSERT(PR_SUCCESS == rv);
+    return newfd;  /* that's it */
+}
+
+static PRInt32 PR_CALLBACK Ipv6ToIpv4SocketAcceptRead(PRFileDesc *sd,
+			PRFileDesc **nd, PRNetAddr **ipv6_raddr, void *buf, PRInt32 amount,
+							PRIntervalTime timeout)
+{
+    PRInt32 nbytes;
+    PRStatus rv;
+	PRNetAddr tmp_ipv4addr;
+    PRFileDesc *newstack;
+
+    PR_ASSERT(sd != NULL);
+    PR_ASSERT(sd->lower != NULL);
+
+    newstack = PR_NEW(PRFileDesc);
+    if (NULL == newstack)
+    {
+        PR_SetError(PR_OUT_OF_MEMORY_ERROR, 0);
+        return -1;
+    }
+    *newstack = *sd;  /* make a copy of the accepting layer */
+
+    nbytes = sd->lower->methods->acceptread(
+        sd->lower, nd, ipv6_raddr, buf, amount, timeout);
+    if (-1 == nbytes)
+    {
+        PR_DELETE(newstack);
+        return nbytes;
+    }
+	tmp_ipv4addr = **ipv6_raddr;	/* copy */
+	_PR_ConvertToIpv6NetAddr(&tmp_ipv4addr, *ipv6_raddr);
+
+    /* this PR_PushIOLayer call cannot fail */
+    rv = PR_PushIOLayer(*nd, PR_TOP_IO_LAYER, newstack);
+    PR_ASSERT(PR_SUCCESS == rv);
+    return nbytes;
+}
+
+static PRStatus PR_CALLBACK Ipv6ToIpv4SocketGetName(PRFileDesc *fd,
+										PRNetAddr *ipv6addr)
+{
+	PRStatus result;
+	PRNetAddr tmp_ipv4addr;
+
+	result = (fd->lower->methods->getsockname)(fd->lower, &tmp_ipv4addr);
+	if (PR_SUCCESS == result) {
+		_PR_ConvertToIpv6NetAddr(&tmp_ipv4addr, ipv6addr);
+		PR_ASSERT(IsValidNetAddr(ipv6addr) == PR_TRUE);
+	}
+	return result;
+}
+
+static PRStatus PR_CALLBACK Ipv6ToIpv4SocketGetPeerName(PRFileDesc *fd,
+										PRNetAddr *ipv6addr)
+{
+	PRStatus result;
+	PRNetAddr tmp_ipv4addr;
+
+	result = (fd->lower->methods->getpeername)(fd->lower, &tmp_ipv4addr);
+	if (PR_SUCCESS == result) {
+		_PR_ConvertToIpv6NetAddr(&tmp_ipv4addr, ipv6addr);
+		PR_ASSERT(IsValidNetAddr(ipv6addr) == PR_TRUE);
+	}
+	return result;
+}
+
+static PRInt32 PR_CALLBACK Ipv6ToIpv4SocketRecvFrom(PRFileDesc *fd, void *buf,
+			PRInt32 amount, PRIntn flags, PRNetAddr *ipv6addr,
+				PRIntervalTime timeout)
+{
+	PRNetAddr tmp_ipv4addr;
+	PRInt32 result;
+
+    result = (fd->lower->methods->recvfrom)(
+        fd->lower, buf, amount, flags, &tmp_ipv4addr, timeout);
+	if (-1 != result) {
+		_PR_ConvertToIpv6NetAddr(&tmp_ipv4addr, ipv6addr);
+		PR_ASSERT(IsValidNetAddr(ipv6addr) == PR_TRUE);
+	}
+	return result;
+}
+
+#if defined(_PR_INET6_PROBE)
+static PRBool ipv6_is_present;
+extern PRBool _pr_test_ipv6_socket(void);
+
+#if !defined(_PR_INET6) && defined(_PR_HAVE_GETIPNODEBYNAME)
+extern PRStatus _pr_find_getipnodebyname(void);
+#endif
+
+#if !defined(_PR_INET6) && defined(_PR_HAVE_GETADDRINFO)
+extern PRStatus _pr_find_getaddrinfo(void);
+#endif
+
+static PRBool
+_pr_probe_ipv6_presence(void)
+{
+#if !defined(_PR_INET6) && defined(_PR_HAVE_GETIPNODEBYNAME)
+    if (_pr_find_getipnodebyname() != PR_SUCCESS)
+        return PR_FALSE;
+#endif
+
+#if !defined(_PR_INET6) && defined(_PR_HAVE_GETADDRINFO)
+    if (_pr_find_getaddrinfo() != PR_SUCCESS)
+        return PR_FALSE;
+#endif
+
+    return _pr_test_ipv6_socket();
+}
+#endif  /* _PR_INET6_PROBE */
+
+static PRCallOnceType _pr_init_ipv6_once;
+
+static PRStatus PR_CALLBACK _pr_init_ipv6(void)
+{
+    const PRIOMethods *stubMethods;
+
+#if defined(_PR_INET6_PROBE)
+    ipv6_is_present = _pr_probe_ipv6_presence();
+    if (ipv6_is_present)
+        return PR_SUCCESS;
+#endif
+
+    _pr_ipv6_to_ipv4_id = PR_GetUniqueIdentity("Ipv6_to_Ipv4 layer");
+    PR_ASSERT(PR_INVALID_IO_LAYER != _pr_ipv6_to_ipv4_id);
+
+	stubMethods = PR_GetDefaultIOMethods();
+
+	ipv6_to_v4_tcpMethods = *stubMethods;  /* first get the entire batch */
+	/* then override the ones we care about */
+	ipv6_to_v4_tcpMethods.connect = Ipv6ToIpv4SocketConnect;
+	ipv6_to_v4_tcpMethods.bind = Ipv6ToIpv4SocketBind;
+	ipv6_to_v4_tcpMethods.accept = Ipv6ToIpv4SocketAccept;
+	ipv6_to_v4_tcpMethods.acceptread = Ipv6ToIpv4SocketAcceptRead;
+	ipv6_to_v4_tcpMethods.getsockname = Ipv6ToIpv4SocketGetName;
+	ipv6_to_v4_tcpMethods.getpeername = Ipv6ToIpv4SocketGetPeerName;
+/*
+	ipv6_to_v4_tcpMethods.getsocketoption = Ipv6ToIpv4GetSocketOption;
+	ipv6_to_v4_tcpMethods.setsocketoption = Ipv6ToIpv4SetSocketOption;
+*/
+	ipv6_to_v4_udpMethods = *stubMethods;  /* first get the entire batch */
+	/* then override the ones we care about */
+	ipv6_to_v4_udpMethods.connect = Ipv6ToIpv4SocketConnect;
+	ipv6_to_v4_udpMethods.bind = Ipv6ToIpv4SocketBind;
+	ipv6_to_v4_udpMethods.sendto = Ipv6ToIpv4SocketSendTo;
+	ipv6_to_v4_udpMethods.recvfrom = Ipv6ToIpv4SocketRecvFrom;
+	ipv6_to_v4_udpMethods.getsockname = Ipv6ToIpv4SocketGetName;
+	ipv6_to_v4_udpMethods.getpeername = Ipv6ToIpv4SocketGetPeerName;
+/*
+	ipv6_to_v4_udpMethods.getsocketoption = Ipv6ToIpv4GetSocketOption;
+	ipv6_to_v4_udpMethods.setsocketoption = Ipv6ToIpv4SetSocketOption;
+*/
+	return PR_SUCCESS;
+}
+
+#if defined(_PR_INET6_PROBE)
+PRBool _pr_ipv6_is_present(void)
+{
+    if (PR_CallOnce(&_pr_init_ipv6_once, _pr_init_ipv6) != PR_SUCCESS)
+        return PR_FALSE;
+    return ipv6_is_present;
+}
+#endif
+
+PR_IMPLEMENT(PRStatus) _pr_push_ipv6toipv4_layer(PRFileDesc *fd)
+{
+	PRFileDesc *ipv6_fd = NULL;
+
+	if (PR_CallOnce(&_pr_init_ipv6_once, _pr_init_ipv6) != PR_SUCCESS)
+		return PR_FAILURE;
+
+	/*
+	 * For platforms with no support for IPv6 
+	 * create layered socket for IPv4-mapped IPv6 addresses
+	 */
+	if (fd->methods->file_type == PR_DESC_SOCKET_TCP)
+		ipv6_fd = PR_CreateIOLayerStub(_pr_ipv6_to_ipv4_id,
+									&ipv6_to_v4_tcpMethods);
+	else
+		ipv6_fd = PR_CreateIOLayerStub(_pr_ipv6_to_ipv4_id,
+									&ipv6_to_v4_udpMethods);
+	if (NULL == ipv6_fd) {
+		goto errorExit;
+	} 
+	ipv6_fd->secret = NULL;
+
+	if (PR_PushIOLayer(fd, PR_TOP_IO_LAYER, ipv6_fd) == PR_FAILURE) {
+		goto errorExit;
+	}
+
+	return PR_SUCCESS;
+errorExit:
+
+	if (ipv6_fd)
+		ipv6_fd->dtor(ipv6_fd);
+	return PR_FAILURE;
+}
+
+#endif /* !defined(_PR_INET6) || defined(_PR_INET6_PROBE) */