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