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SoapyRPCSocket.cpp
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SoapyRPCSocket.cpp
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// Copyright (c) 2015-2018 Josh Blum
// SPDX-License-Identifier: BSL-1.0
#include "SoapySocketDefs.hpp"
#include "SoapyRPCSocket.hpp"
#include "SoapyURLUtils.hpp"
#include <SoapySDR/Logger.hpp>
#include <cstring> //strerror
#include <cerrno> //errno
#include <mutex>
static std::mutex sessionMutex;
static size_t sessionCount = 0;
SoapySocketSession::SoapySocketSession(void)
{
std::lock_guard<std::mutex> lock(sessionMutex);
sessionCount++;
if (sessionCount > 1) return;
#ifdef _MSC_VER
WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(2, 2);
int ret = WSAStartup(wVersionRequested, &wsaData);
if (ret != 0)
{
SoapySDR::logf(SOAPY_SDR_ERROR, "SoapySocketSession::WSAStartup: %d", ret);
}
#endif
}
SoapySocketSession::~SoapySocketSession(void)
{
std::lock_guard<std::mutex> lock(sessionMutex);
sessionCount--;
if (sessionCount > 0) return;
#ifdef _MSC_VER
WSACleanup();
#endif
}
void SoapyRPCSocket::setDefaultTcpSockOpts(void)
{
if (this->null()) return;
int one = 1;
int ret = ::setsockopt(_sock, IPPROTO_TCP, TCP_NODELAY, (const char *)&one, sizeof(one));
if (ret != 0)
{
this->reportError("setsockopt(TCP_NODELAY)");
}
#ifdef TCP_QUICKACK
ret = ::setsockopt(_sock, IPPROTO_TCP, TCP_QUICKACK, (const char *)&one, sizeof(one));
if (ret != 0)
{
this->reportError("setsockopt(TCP_QUICKACK)");
}
#endif //TCP_QUICKACK
}
SoapyRPCSocket::SoapyRPCSocket(void):
_sock(INVALID_SOCKET)
{
return;
}
SoapyRPCSocket::SoapyRPCSocket(const std::string &url):
_sock(INVALID_SOCKET)
{
SoapyURL urlObj(url);
SockAddrData addr;
const auto errorMsg = urlObj.toSockAddr(addr);
if (not errorMsg.empty())
{
this->reportError("getaddrinfo("+url+")", errorMsg);
}
else
{
_sock = ::socket(addr.addr()->sa_family, urlObj.getType(), 0);
}
}
SoapyRPCSocket::~SoapyRPCSocket(void)
{
if (this->close() != 0)
{
SoapySDR::logf(SOAPY_SDR_ERROR, "SoapyRPCSocket::~SoapyRPCSocket: %s", this->lastErrorMsg());
}
}
bool SoapyRPCSocket::null(void)
{
return _sock == INVALID_SOCKET;
}
bool SoapyRPCSocket::status(void)
{
int opt = 0;
socklen_t optlen = sizeof(opt);
::getsockopt(_sock, SOL_SOCKET, SO_ERROR, (char *)&opt, &optlen);
if (opt != 0) this->reportError("getsockopt(SO_ERROR)", opt);
return opt == 0;
}
int SoapyRPCSocket::close(void)
{
if (this->null()) return 0;
int ret = ::closesocket(_sock);
_sock = INVALID_SOCKET;
return ret;
}
int SoapyRPCSocket::bind(const std::string &url)
{
SoapyURL urlObj(url);
SockAddrData addr;
const auto errorMsg = urlObj.toSockAddr(addr);
if (not errorMsg.empty())
{
this->reportError("getaddrinfo("+url+")", errorMsg);
return -1;
}
if (this->null()) _sock = ::socket(addr.addr()->sa_family, urlObj.getType(), 0);
if (this->null()) return -1;
//setup reuse address
int one = 1;
int ret = ::setsockopt(_sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&one, sizeof(one));
if (ret != 0)
{
this->reportError("setsockopt(SO_REUSEADDR)");
}
#ifdef __APPLE__
ret = ::setsockopt(_sock, SOL_SOCKET, SO_REUSEPORT, (const char *)&one, sizeof(one));
if (ret != 0)
{
this->reportError("setsockopt(SO_REUSEPORT)");
}
#endif //__APPLE__
if (urlObj.getType() == SOCK_STREAM) this->setDefaultTcpSockOpts();
ret = ::bind(_sock, addr.addr(), addr.addrlen());
if (ret == -1) this->reportError("bind("+url+")");
return ret;
}
int SoapyRPCSocket::listen(int backlog)
{
int ret = ::listen(_sock, backlog);
if (ret == -1) this->reportError("listen()");
return ret;
}
SoapyRPCSocket *SoapyRPCSocket::accept(void)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int client = ::accept(_sock, (struct sockaddr*)&addr, &addrlen);
if (client == INVALID_SOCKET) return NULL;
SoapyRPCSocket *clientSock = new SoapyRPCSocket();
clientSock->_sock = client;
clientSock->setDefaultTcpSockOpts();
return clientSock;
}
int SoapyRPCSocket::connect(const std::string &url)
{
SoapyURL urlObj(url);
SockAddrData addr;
const auto errorMsg = urlObj.toSockAddr(addr);
if (not errorMsg.empty())
{
this->reportError("getaddrinfo("+url+")", errorMsg);
return -1;
}
if (this->null()) _sock = ::socket(addr.addr()->sa_family, urlObj.getType(), 0);
if (this->null()) return -1;
if (urlObj.getType() == SOCK_STREAM) this->setDefaultTcpSockOpts();
int ret = ::connect(_sock, addr.addr(), addr.addrlen());
if (ret == -1) this->reportError("connect("+url+")");
return ret;
}
int SoapyRPCSocket::connect(const std::string &url, const long timeoutUs)
{
SoapyURL urlObj(url);
SockAddrData addr;
const auto errorMsg = urlObj.toSockAddr(addr);
if (not errorMsg.empty())
{
this->reportError("getaddrinfo("+url+")", errorMsg);
return -1;
}
if (this->null()) _sock = ::socket(addr.addr()->sa_family, urlObj.getType(), 0);
if (this->null()) return -1;
if (urlObj.getType() == SOCK_STREAM) this->setDefaultTcpSockOpts();
//enable non blocking
int ret = this->setNonBlocking(true);
if (ret != 0) return ret;
//non blocking connect, check for non busy
ret = ::connect(_sock, addr.addr(), addr.addrlen());
if (ret != 0 and SOCKET_ERRNO != SOCKET_EINPROGRESS)
{
this->reportError("connect("+url+")");
return ret;
}
//fill in the select structures
struct timeval tv;
tv.tv_sec = timeoutUs / 1000000;
tv.tv_usec = timeoutUs % 1000000;
fd_set fds;
FD_ZERO(&fds);
FD_SET(_sock, &fds);
//wait for connect or timeout
ret = ::select(_sock+1, NULL, &fds, NULL, &tv);
if (ret != 1)
{
this->reportError("connect("+url+")", SOCKET_ETIMEDOUT);
return -1;
}
//get the error code from connect()
int opt = 0;
socklen_t optlen = sizeof(opt);
::getsockopt(_sock, SOL_SOCKET, SO_ERROR, (char *)&opt, &optlen);
if (opt != 0)
{
this->reportError("connect("+url+")", opt);
return opt;
}
//revert non blocking on socket
ret = this->setNonBlocking(false);
if (ret != 0) return ret;
return opt;
}
int SoapyRPCSocket::setNonBlocking(const bool nonblock)
{
int ret = 0;
#ifdef _MSC_VER
u_long mode = nonblock?1:0; // 1 to enable non-blocking socket
ret = ioctlsocket(_sock, FIONBIO, &mode);
#else
int mode = fcntl(_sock, F_GETFL, 0);
if (nonblock) mode |= O_NONBLOCK;
else mode &= ~(O_NONBLOCK);
ret = fcntl(_sock, F_SETFL, mode);
#endif
if (ret != 0) this->reportError("setNonBlocking("+std::string(nonblock?"true":"false")+")");
return ret;
}
/*!
* OSX doesn't support automatic ipv6mr_interface = 0.
* The following code attempts to work around this issue
* by manually selecting a multicast capable interface.
*/
static int getDefaultIfaceIndex(void)
{
#ifdef __APPLE__
//find the first available multicast interfaces
int loIface = 0, enIface = 0;
struct ifaddrs *ifa = nullptr;
getifaddrs(&ifa);
while (ifa != nullptr)
{
const bool isIPv6 = ifa->ifa_addr->sa_family == AF_INET6;
const bool isUp = ((ifa->ifa_flags & IFF_UP) != 0);
const bool isLoopback = ((ifa->ifa_flags & IFF_LOOPBACK) != 0);
const bool isMulticast = ((ifa->ifa_flags & IFF_MULTICAST) != 0);
const int ifaceIndex = if_nametoindex(ifa->ifa_name);
SoapySDR::logf(SOAPY_SDR_DEBUG, "Interface: #%d(%s) ipv6=%d, up=%d, lb=%d, mcast=%d",
ifaceIndex, ifa->ifa_name, isIPv6, isUp, isLoopback, isMulticast);
if (isIPv6 and isUp and isLoopback and isMulticast and loIface == 0) loIface = ifaceIndex;
if (isIPv6 and isUp and not isLoopback and isMulticast and enIface == 0) enIface = ifaceIndex;
ifa = ifa->ifa_next;
}
freeifaddrs(ifa);
SoapySDR::logf(SOAPY_SDR_DEBUG, "Default loopback: #%d, default ethernet #%d", loIface, enIface);
//prefer discovered regular interface over loopback
if (enIface != 0) return enIface;
if (loIface != 0) return loIface;
#endif //__APPLE__
return 0;
}
int SoapyRPCSocket::multicastJoin(const std::string &group, const bool loop, const int ttl, int iface)
{
/*
* Multicast join docs:
* http://www.tldp.org/HOWTO/Multicast-HOWTO-6.html
* http://www.tenouk.com/Module41c.html
*/
//lookup group url
SoapyURL urlObj(group);
SockAddrData addr;
const auto errorMsg = urlObj.toSockAddr(addr);
if (not errorMsg.empty())
{
this->reportError("getaddrinfo("+group+")", errorMsg);
return -1;
}
//create socket if null
if (this->null()) _sock = ::socket(addr.addr()->sa_family, SOCK_DGRAM, 0);
if (this->null()) return -1;
int ret = 0;
int loopInt = loop?1:0;
switch(addr.addr()->sa_family)
{
case AF_INET: {
//setup IP_MULTICAST_LOOP
ret = ::setsockopt(_sock, IPPROTO_IP, IP_MULTICAST_LOOP, (const char *)&loopInt, sizeof(loopInt));
if (ret != 0)
{
this->reportError("setsockopt(IP_MULTICAST_LOOP)");
return -1;
}
//setup IP_MULTICAST_TTL
ret = ::setsockopt(_sock, IPPROTO_IP, IP_MULTICAST_TTL, (const char *)&ttl, sizeof(ttl));
if (ret != 0)
{
this->reportError("setsockopt(IP_MULTICAST_TTL)");
return -1;
}
//setup IP_ADD_MEMBERSHIP
auto *addr_in = (const struct sockaddr_in *)addr.addr();
struct ip_mreq mreq;
mreq.imr_multiaddr = addr_in->sin_addr;
mreq.imr_interface.s_addr = INADDR_ANY;
ret = ::setsockopt(_sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const char *)&mreq, sizeof(mreq));
if (ret != 0)
{
this->reportError("setsockopt(IP_ADD_MEMBERSHIP)");
return -1;
}
break;
}
case AF_INET6: {
//setup IPV6_MULTICAST_LOOP
ret = ::setsockopt(_sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, (const char *)&loopInt, sizeof(loopInt));
if (ret != 0)
{
this->reportError("setsockopt(IPV6_MULTICAST_LOOP)");
return -1;
}
//setup IPV6_MULTICAST_HOPS
ret = ::setsockopt(_sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, (const char *)&ttl, sizeof(ttl));
if (ret != 0)
{
this->reportError("setsockopt(IPV6_MULTICAST_HOPS)");
return -1;
}
//setup IPV6_MULTICAST_IF
if (iface == 0) iface = getDefaultIfaceIndex();
if (iface != 0)
{
ret = ::setsockopt(_sock, IPPROTO_IPV6, IPV6_MULTICAST_IF, (const char *)&iface, sizeof(iface));
if (ret != 0)
{
this->reportError("setsockopt(IPV6_MULTICAST_IF)");
return -1;
}
}
//setup IPV6_ADD_MEMBERSHIP
auto *addr_in6 = (const struct sockaddr_in6 *)addr.addr();
struct ipv6_mreq mreq6;
mreq6.ipv6mr_multiaddr = addr_in6->sin6_addr;
mreq6.ipv6mr_interface = iface;
ret = ::setsockopt(_sock, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (const char *)&mreq6, sizeof(mreq6));
if (ret != 0)
{
this->reportError("setsockopt(IPV6_ADD_MEMBERSHIP)");
return -1;
}
break;
}
default:
break;
}
return 0;
}
int SoapyRPCSocket::send(const void *buf, size_t len, int flags)
{
int ret = ::send(_sock, (const char *)buf, int(len), flags);
if (ret == -1) this->reportError("send()");
return ret;
}
int SoapyRPCSocket::recv(void *buf, size_t len, int flags)
{
int ret = ::recv(_sock, (char *)buf, int(len), flags);
if (ret == -1) this->reportError("recv()");
return ret;
}
int SoapyRPCSocket::sendto(const void *buf, size_t len, const std::string &url, int flags)
{
SockAddrData addr; SoapyURL(url).toSockAddr(addr);
int ret = ::sendto(_sock, (char *)buf, int(len), flags, addr.addr(), addr.addrlen());
if (ret == -1) this->reportError("sendto("+url+")");
return ret;
}
int SoapyRPCSocket::recvfrom(void *buf, size_t len, std::string &url, int flags)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int ret = ::recvfrom(_sock, (char *)buf, int(len), flags, (struct sockaddr*)&addr, &addrlen);
if (ret == -1) this->reportError("recvfrom()");
else url = SoapyURL((struct sockaddr *)&addr).toString();
return ret;
}
bool SoapyRPCSocket::selectRecv(const long timeoutUs)
{
struct timeval tv;
tv.tv_sec = timeoutUs / 1000000;
tv.tv_usec = timeoutUs % 1000000;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(_sock, &readfds);
int ret = ::select(_sock+1, &readfds, NULL, NULL, &tv);
if (ret == -1) this->reportError("select()");
return ret == 1;
}
static std::string errToString(const int err)
{
char buff[1024];
#ifdef _MSC_VER
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&buff, sizeof(buff), NULL);
return buff;
#else
//http://linux.die.net/man/3/strerror_r
#if ((_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE) || __APPLE__
strerror_r(err, buff, sizeof(buff));
#else
//this version may decide to use its own internal string
return strerror_r(err, buff, sizeof(buff));
#endif
return buff;
#endif
}
void SoapyRPCSocket::reportError(const std::string &what)
{
this->reportError(what, SOCKET_ERRNO);
}
void SoapyRPCSocket::reportError(const std::string &what, const int err)
{
if (err == 0) _lastErrorMsg = what;
else this->reportError(what, std::to_string(err) + ": " + errToString(err));
}
void SoapyRPCSocket::reportError(const std::string &what, const std::string &errorMsg)
{
_lastErrorMsg = what + " [" + errorMsg + "]";
}
std::string SoapyRPCSocket::getsockname(void)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int ret = ::getsockname(_sock, (struct sockaddr *)&addr, &addrlen);
if (ret == -1) this->reportError("getsockname()");
if (ret != 0) return "";
return SoapyURL((struct sockaddr *)&addr).toString();
}
std::string SoapyRPCSocket::getpeername(void)
{
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
int ret = ::getpeername(_sock, (struct sockaddr *)&addr, &addrlen);
if (ret == -1) this->reportError("getpeername()");
if (ret != 0) return "";
return SoapyURL((struct sockaddr *)&addr).toString();
}
int SoapyRPCSocket::setBuffSize(const bool isRecv, const size_t numBytes)
{
int opt = int(numBytes);
int ret = ::setsockopt(_sock, SOL_SOCKET, isRecv?SO_RCVBUF:SO_SNDBUF, (const char *)&opt, sizeof(opt));
if (ret == -1) this->reportError("setsockopt("+std::string(isRecv?"SO_RCVBUF":"SO_SNDBUF")+")");
return ret;
}
int SoapyRPCSocket::getBuffSize(const bool isRecv)
{
int opt = 0;
socklen_t optlen = sizeof(opt);
int ret = ::getsockopt(_sock, SOL_SOCKET, isRecv?SO_RCVBUF:SO_SNDBUF, (char *)&opt, &optlen);
if (ret == -1) this->reportError("getsockopt("+std::string(isRecv?"SO_RCVBUF":"SO_SNDBUF")+")");
if (ret != 0) return ret;
//adjustment for linux kernel socket buffer doubling for bookkeeping
#ifdef __linux
opt = opt/2;
#endif
return opt;
}