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// @file sock.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "pch.h"
#include "sock.h"
namespace mongo {
static mongo::mutex sock_mutex("sock_mutex");
static bool ipv6 = false;
void enableIPv6(bool state) { ipv6 = state; }
bool IPv6Enabled() { return ipv6; }
string getAddrInfoStrError(int code) {
#if !defined(_WIN32)
return gai_strerror(code);
#else
/* gai_strerrorA is not threadsafe on windows. don't use it. */
return errnoWithDescription(code);
#endif
}
SockAddr::SockAddr(int sourcePort) {
memset(as<sockaddr_in>().sin_zero, 0, sizeof(as<sockaddr_in>().sin_zero));
as<sockaddr_in>().sin_family = AF_INET;
as<sockaddr_in>().sin_port = htons(sourcePort);
as<sockaddr_in>().sin_addr.s_addr = htonl(INADDR_ANY);
addressSize = sizeof(sockaddr_in);
}
SockAddr::SockAddr(const char * iporhost , int port) {
if (!strcmp(iporhost, "localhost"))
iporhost = "127.0.0.1";
if (strchr(iporhost, '/')) {
#ifdef _WIN32
uassert(13080, "no unix socket support on windows", false);
#endif
uassert(13079, "path to unix socket too long", strlen(iporhost) < sizeof(as<sockaddr_un>().sun_path));
as<sockaddr_un>().sun_family = AF_UNIX;
strcpy(as<sockaddr_un>().sun_path, iporhost);
addressSize = sizeof(sockaddr_un);
}
else {
addrinfo* addrs = NULL;
addrinfo hints;
memset(&hints, 0, sizeof(addrinfo));
hints.ai_socktype = SOCK_STREAM;
//hints.ai_flags = AI_ADDRCONFIG; // This is often recommended but don't do it. SERVER-1579
hints.ai_flags |= AI_NUMERICHOST; // first pass tries w/o DNS lookup
hints.ai_family = (IPv6Enabled() ? AF_UNSPEC : AF_INET);
stringstream ss;
ss << port;
int ret = getaddrinfo(iporhost, ss.str().c_str(), &hints, &addrs);
// old C compilers on IPv6-capable hosts return EAI_NODATA error
#ifdef EAI_NODATA
int nodata = (ret == EAI_NODATA);
#else
int nodata = false;
#endif
if (ret == EAI_NONAME || nodata) {
// iporhost isn't an IP address, allow DNS lookup
hints.ai_flags &= ~AI_NUMERICHOST;
ret = getaddrinfo(iporhost, ss.str().c_str(), &hints, &addrs);
}
if (ret) {
log() << "getaddrinfo(\"" << iporhost << "\") failed: " << gai_strerror(ret) << endl;
*this = SockAddr(port);
}
else {
//TODO: handle other addresses in linked list;
assert(addrs->ai_addrlen <= sizeof(sa));
memcpy(&sa, addrs->ai_addr, addrs->ai_addrlen);
addressSize = addrs->ai_addrlen;
freeaddrinfo(addrs);
}
}
}
bool SockAddr::isLocalHost() const {
switch (getType()) {
case AF_INET: return getAddr() == "127.0.0.1";
case AF_INET6: return getAddr() == "::1";
case AF_UNIX: return true;
default: return false;
}
assert(false);
return false;
}
string hostbyname(const char *hostname) {
string addr = SockAddr(hostname, 0).getAddr();
if (addr == "0.0.0.0")
return "";
else
return addr;
}
class UDPConnection {
public:
UDPConnection() {
sock = 0;
}
~UDPConnection() {
if ( sock ) {
closesocket(sock);
sock = 0;
}
}
bool init(const SockAddr& myAddr);
int recvfrom(char *buf, int len, SockAddr& sender);
int sendto(char *buf, int len, const SockAddr& EndPoint);
int mtu(const SockAddr& sa) {
return sa.isLocalHost() ? 16384 : 1480;
}
SOCKET sock;
};
inline int UDPConnection::recvfrom(char *buf, int len, SockAddr& sender) {
return ::recvfrom(sock, buf, len, 0, sender.raw(), &sender.addressSize);
}
inline int UDPConnection::sendto(char *buf, int len, const SockAddr& EndPoint) {
if ( 0 && rand() < (RAND_MAX>>4) ) {
out() << " NOTSENT ";
return 0;
}
return ::sendto(sock, buf, len, 0, EndPoint.raw(), EndPoint.addressSize);
}
inline bool UDPConnection::init(const SockAddr& myAddr) {
sock = socket(myAddr.getType(), SOCK_DGRAM, IPPROTO_UDP);
if ( sock == INVALID_SOCKET ) {
out() << "invalid socket? " << errnoWithDescription() << endl;
return false;
}
if ( ::bind(sock, myAddr.raw(), myAddr.addressSize) != 0 ) {
out() << "udp init failed" << endl;
closesocket(sock);
sock = 0;
return false;
}
socklen_t optLen;
int rcvbuf;
if (getsockopt(sock,
SOL_SOCKET,
SO_RCVBUF,
(char*)&rcvbuf,
&optLen) != -1)
out() << "SO_RCVBUF:" << rcvbuf << endl;
return true;
}
void sendtest() {
out() << "sendtest\n";
SockAddr me(27016);
SockAddr dest("127.0.0.1", 27015);
UDPConnection c;
if ( c.init(me) ) {
char buf[256];
out() << "sendto: ";
out() << c.sendto(buf, sizeof(buf), dest) << " " << errnoWithDescription() << endl;
}
out() << "end\n";
}
void listentest() {
out() << "listentest\n";
SockAddr me(27015);
SockAddr sender;
UDPConnection c;
if ( c.init(me) ) {
char buf[256];
out() << "recvfrom: ";
out() << c.recvfrom(buf, sizeof(buf), sender) << " " << errnoWithDescription() << endl;
}
out() << "end listentest\n";
}
void xmain();
#if defined(_WIN32)
namespace {
struct WinsockInit {
WinsockInit() {
WSADATA d;
if ( WSAStartup(MAKEWORD(2,2), &d) != 0 ) {
out() << "ERROR: wsastartup failed " << errnoWithDescription() << endl;
problem() << "ERROR: wsastartup failed " << errnoWithDescription() << endl;
dbexit( EXIT_NTSERVICE_ERROR );
}
}
} winsock_init;
}
#endif
SockAddr unknownAddress( "0.0.0.0", 0 );
ListeningSockets* ListeningSockets::_instance = new ListeningSockets();
ListeningSockets* ListeningSockets::get() {
return _instance;
}
string _hostNameCached;
static void _hostNameCachedInit() {
_hostNameCached = getHostName();
}
boost::once_flag _hostNameCachedInitFlags = BOOST_ONCE_INIT;
string getHostNameCached() {
boost::call_once( _hostNameCachedInit , _hostNameCachedInitFlags );
return _hostNameCached;
}
} // namespace mongo
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