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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/address_list.h"
#if defined(OS_WIN)
#include <ws2tcpip.h>
#else
#include <netdb.h>
#endif
#include <stdlib.h>
#include "base/logging.h"
namespace net {
namespace {
// Make a deep copy of |info|. This copy should be deleted using
// DeleteCopyOfAddrinfo(), and NOT freeaddrinfo().
struct addrinfo* CreateCopyOfAddrinfo(const struct addrinfo* info) {
struct addrinfo* copy = new struct addrinfo;
// Copy all the fields (some of these are pointers, we will fix that next).
memcpy(copy, info, sizeof(addrinfo));
// ai_canonname is a NULL-terminated string.
if (info->ai_canonname) {
#ifdef OS_WIN
copy->ai_canonname = _strdup(info->ai_canonname);
#else
copy->ai_canonname = strdup(info->ai_canonname);
#endif
}
// ai_addr is a buffer of length ai_addrlen.
if (info->ai_addr) {
copy->ai_addr = reinterpret_cast<sockaddr *>(new char[info->ai_addrlen]);
memcpy(copy->ai_addr, info->ai_addr, info->ai_addrlen);
}
// Recursive copy.
if (info->ai_next)
copy->ai_next = CreateCopyOfAddrinfo(info->ai_next);
return copy;
}
// Free an addrinfo that was created by CreateCopyOfAddrinfo().
void FreeMyAddrinfo(struct addrinfo* info) {
if (info->ai_canonname)
free(info->ai_canonname); // Allocated by strdup.
if (info->ai_addr)
delete [] reinterpret_cast<char*>(info->ai_addr);
struct addrinfo* next = info->ai_next;
delete info;
// Recursive free.
if (next)
FreeMyAddrinfo(next);
}
// Returns the address to port field in |info|.
uint16* GetPortField(const struct addrinfo* info) {
if (info->ai_family == AF_INET) {
DCHECK_EQ(sizeof(sockaddr_in), info->ai_addrlen);
struct sockaddr_in* sockaddr =
reinterpret_cast<struct sockaddr_in*>(info->ai_addr);
return &sockaddr->sin_port;
} else if (info->ai_family == AF_INET6) {
DCHECK_EQ(sizeof(sockaddr_in6), info->ai_addrlen);
struct sockaddr_in6* sockaddr =
reinterpret_cast<struct sockaddr_in6*>(info->ai_addr);
return &sockaddr->sin6_port;
} else {
NOTREACHED();
return NULL;
}
}
// Assign the port for all addresses in the list.
void SetPortRecursive(struct addrinfo* info, int port) {
uint16* port_field = GetPortField(info);
*port_field = htons(port);
// Assign recursively.
if (info->ai_next)
SetPortRecursive(info->ai_next, port);
}
} // namespace
void AddressList::Adopt(struct addrinfo* head) {
data_ = new Data(head, true /*is_system_created*/);
}
void AddressList::Copy(const struct addrinfo* head) {
data_ = new Data(CreateCopyOfAddrinfo(head), false /*is_system_created*/);
}
void AddressList::SetPort(int port) {
SetPortRecursive(data_->head, port);
}
int AddressList::GetPort() const {
uint16* port_field = GetPortField(data_->head);
return ntohs(*port_field);
}
void AddressList::SetFrom(const AddressList& src, int port) {
if (src.GetPort() == port) {
// We can reference the data from |src| directly.
*this = src;
} else {
// Otherwise we need to make a copy in order to change the port number.
Copy(src.head());
SetPort(port);
}
}
void AddressList::Reset() {
data_ = NULL;
}
// static
AddressList AddressList::CreateIPv6Address(unsigned char data[16]) {
struct addrinfo* ai = new struct addrinfo;
memset(ai, 0, sizeof(struct addrinfo));
ai->ai_family = AF_INET6;
ai->ai_socktype = SOCK_STREAM;
ai->ai_addrlen = sizeof(struct sockaddr_in6);
struct sockaddr_in6* addr6 = reinterpret_cast<struct sockaddr_in6*>(
new char[ai->ai_addrlen]);
memset(addr6, 0, sizeof(struct sockaddr_in6));
ai->ai_addr = reinterpret_cast<struct sockaddr*>(addr6);
addr6->sin6_family = AF_INET6;
memcpy(&addr6->sin6_addr, data, 16);
return AddressList(new Data(ai, false /*is_system_created*/));
}
AddressList::Data::~Data() {
// Call either freeaddrinfo(head), or FreeMyAddrinfo(head), depending who
// created the data.
if (is_system_created)
freeaddrinfo(head);
else
FreeMyAddrinfo(head);
}
} // namespace net
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