The Tor Browser: nsprpub/pr/src/io/pripv6.c@6474c204b198 (annotated)

nsprpub/pr/src/io/pripv6.c@6474c204b198 (annotated)

nsprpub/pr/src/io/pripv6.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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) */

The Tor Browser / annotate

nsprpub/pr/src/io/pripv6.c@6474c204b198 (annotated)

nsprpub/pr/src/io/pripv6.c