comm.cc File Reference

#include "squid.h"
#include "base/AsyncFunCalls.h"
#include "base/OnOff.h"
#include "ClientInfo.h"
#include "comm/AcceptLimiter.h"
#include "comm/comm_internal.h"
#include "comm/Connection.h"
#include "comm/IoCallback.h"
#include "comm/Loops.h"
#include "comm/Read.h"
#include "comm/TcpAcceptor.h"
#include "comm/Write.h"
#include "compat/cmsg.h"
#include "DescriptorSet.h"
#include "event.h"
#include "fd.h"
#include "fde.h"
#include "globals.h"
#include "icmp/net_db.h"
#include "ip/Intercept.h"
#include "ip/QosConfig.h"
#include "ip/tools.h"
#include "pconn.h"
#include "sbuf/SBuf.h"
#include "sbuf/Stream.h"
#include "SquidConfig.h"
#include "StatCounters.h"
#include "StoreIOBuffer.h"
#include "tools.h"
#include "ssl/support.h"
#include <cerrno>
#include <cmath>

Include dependency graph for comm.cc:

Go to the source code of this file.

Functions
static int	comm_openex (int sock_type, int proto, Ip::Address &, int flags, const char *note)
static void	comm_init_opened (const Comm::ConnectionPointer &conn, const char *note, struct addrinfo *AI)
	update FD tables after a local or remote (IPC) comm_openex(); More...
static int	comm_apply_flags (int new_socket, Ip::Address &addr, int flags, struct addrinfo *AI)
static void	commHandleWriteHelper (void *data)
static void	commPlanHalfClosedCheck ()
static Comm::Flag	commBind (int s, struct addrinfo &)
static void	commSetBindAddressNoPort (int)
static void	commSetReuseAddr (int)
static void	commConfigureLinger (int fd, OnOff)
static void	commSetTcpRcvbuf (int, int)
bool	isOpen (const int fd)
static void	comm_empty_os_read_buffers (int fd)
int	comm_udp_recvfrom (int fd, void *buf, size_t len, int flags, Ip::Address &from)
int	comm_udp_recv (int fd, void *buf, size_t len, int flags)
ssize_t	comm_udp_send (int s, const void *buf, size_t len, int flags)
bool	comm_has_incomplete_write (int fd)
unsigned short	comm_local_port (int fd)
int	comm_open (int sock_type, int proto, Ip::Address &addr, int flags, const char *note)
void	comm_open_listener (int sock_type, int proto, Comm::ConnectionPointer &conn, const char *note)
int	comm_open_listener (int sock_type, int proto, Ip::Address &addr, int flags, const char *note)
static bool	limitError (int const anErrno)
static void	comm_set_v6only (int fd, int tos)
static void	comm_set_transparent (int fd)
void	comm_import_opened (const Comm::ConnectionPointer &conn, const char *note, struct addrinfo *AI)
	update Comm state after getting a comm_open() FD from another process More...
void	commUnsetFdTimeout (int fd)
	clear a timeout handler by FD number More...
void	commSetConnTimeout (const Comm::ConnectionPointer &conn, time_t timeout, AsyncCall::Pointer &callback)
void	commUnsetConnTimeout (const Comm::ConnectionPointer &conn)
int	comm_connect_addr (int sock, const Ip::Address &address)
void	commCallCloseHandlers (int fd)
void	comm_reset_close (const Comm::ConnectionPointer &conn)
void	old_comm_reset_close (int fd)
static void	commStartTlsClose (const int fd)
static void	comm_close_complete (const int fd)
void	_comm_close (int fd, char const *file, int line)
int	comm_udp_sendto (int fd, const Ip::Address &to_addr, const void *buf, int len)
AsyncCall::Pointer	comm_add_close_handler (int fd, CLCB *handler, void *data)
void	comm_add_close_handler (int fd, AsyncCall::Pointer &call)
void	comm_remove_close_handler (int fd, CLCB *handler, void *data)
void	comm_remove_close_handler (int fd, AsyncCall::Pointer &call)
int	commSetNonBlocking (int fd)
int	commUnsetNonBlocking (int fd)
void	commSetCloseOnExec (int fd)
void	comm_init (void)
void	comm_exit (void)
int	ignoreErrno (int ierrno)
void	commCloseAllSockets (void)
static bool	AlreadyTimedOut (fde *F)
static bool	writeTimedOut (int fd)
void	checkTimeouts (void)
void	commStartHalfClosedMonitor (int fd)
	Start waiting for a possibly half-closed connection to close. More...
static void	commHalfClosedCheck (void *)
bool	commHasHalfClosedMonitor (int fd)
	checks whether we are waiting for possibly half-closed connection to close More...
void	commStopHalfClosedMonitor (int const fd)
	stop waiting for possibly half-closed connection to close More...
static void	commHalfClosedReader (const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag flag, int, void *)
	I/O handler for the possibly half-closed connection monitoring code. More...
int	comm_open_uds (int sock_type, int proto, struct sockaddr_un *addr, int flags)
	Create a unix-domain socket (UDS) that only supports FD_MSGHDR I/O. More...

Variables
static IOCB	commHalfClosedReader
static DescriptorSet *	TheHalfClosed = nullptr
static bool	WillCheckHalfClosed = false
	the set of half-closed FDs More...
static EVH	commHalfClosedCheck
	true if check is scheduled More...

Function Documentation

_comm_close()

void _comm_close	(	int	fd,
		char const *	file,
		int	line
	)

Definition at line 836 of file comm.cc.

References assert, asyncCall(), callDialer(), comm_close_complete(), comm_empty_os_read_buffers(), COMM_SELECT_READ, COMM_SELECT_WRITE, commCallCloseHandlers(), commHasHalfClosedMonitor(), COMMIO_FD_READCB, COMMIO_FD_WRITECB, commStartTlsClose(), commStopHalfClosedMonitor(), commUnsetFdTimeout(), DBG_IMPORTANT, debugs, Comm::ERR_CLOSING, F(), FD_FILE, fd_table, isOpen(), reconfiguring, ScheduleCallHere, BandwidthBucket::SelectBucket(), Comm::SetSelect(), shutting_down, and Squid_MaxFD.

AlreadyTimedOut()

static bool AlreadyTimedOut ( fde *  F )

static

Definition at line 1464 of file comm.cc.

References F(), and squid_curtime.

Referenced by checkTimeouts().

checkTimeouts()

void checkTimeouts

(

void

)

Definition at line 1491 of file comm.cc.

References AlreadyTimedOut(), Biggest_FD, comm_close, Comm::COMM_ERROR, COMM_SELECT_WRITE, COMMIO_FD_WRITECB, debugs, F(), fd_table, Comm::HandleWrite, CodeContext::Reset(), ScheduleCallHere, Comm::SetSelect(), and writeTimedOut().

Referenced by CommSelectEngine::checkEvents().

comm_add_close_handler() [1/2]

void comm_add_close_handler	(	int	fd,
		AsyncCall::Pointer &	call
	)

Definition at line 951 of file comm.cc.

References debugs, fd_table, and AsyncCall::setNext().

comm_add_close_handler() [2/2]

AsyncCall::Pointer comm_add_close_handler	(	int	fd,
		CLCB *	handler,
		void *	data
	)

Definition at line 939 of file comm.cc.

References comm_add_close_handler(), commCbCall(), and debugs.

Referenced by comm_add_close_handler(), Log::TcpLogger::connectDone(), Comm::ConnOpener::createFd(), Snmp::Forwarder::Forwarder(), Mgr::Forwarder::Forwarder(), HttpStateData::HttpStateData(), idnsInitVCConnected(), TunnelStateData::Connection::initConnection(), Mgr::Inquirer::Inquirer(), Snmp::Inquirer::Inquirer(), Ftp::Channel::opened(), Helper::Client::openSessions(), statefulhelper::openSessions(), Security::PeerConnector::PeerConnector(), ConnStateData::pinConnection(), Comm::TcpAcceptor::setListen(), ConnStateData::start(), Mgr::StoreToCommWriter::StoreToCommWriter(), FwdState::syncWithServerConn(), Adaptation::Icap::Xaction::useIcapConnection(), Http::Tunneler::watchForClosures(), and whoisStart().

comm_apply_flags()

static int comm_apply_flags ( int  new_socket, Ip::Address &  addr, int  flags, struct addrinfo *  AI  )

static

apply flags after a local comm_open*() call; returns new_socket or -1 on error

Definition at line 470 of file comm.cc.

References assert, comm_close, COMM_DOBIND, COMM_DOBIND_PORT_LATER, Comm::COMM_ERROR, COMM_NOCLOEXEC, COMM_NONBLOCKING, COMM_REUSEADDR, COMM_REUSEPORT, comm_set_transparent(), COMM_TRANSPARENT, commBind(), commConfigureLinger(), commSetBindAddressNoPort(), commSetCloseOnExec(), commSetNonBlocking(), commSetReuseAddr(), commSetTcpRcvbuf(), Config, DBG_CRITICAL, DBG_IMPORTANT, debugs, Ip::Address::isAnyAddr(), Ip::Address::isNoAddr(), off, Comm::OK, on, opt_reuseaddr, Ip::Address::port(), reconfiguring, SquidConfig::tcpRcvBufsz, TexcHere, ToSBuf(), and xstrerr().

Referenced by comm_openex().

comm_close_complete()

static void comm_close_complete ( const int  fd )

static

Definition at line 810 of file comm.cc.

References F(), fd_close(), fd_table, Comm::AcceptLimiter::Instance(), Comm::AcceptLimiter::kick(), CodeContext::Reset(), StatCounters::sock, statCounter, and StatCounters::syscalls.

Referenced by _comm_close().

comm_connect_addr()

int comm_connect_addr	(	int	sock,
		const Ip::Address &	address
	)

Connect socket FD to given remote address. If return value is an error flag (COMM_ERROR, ERR_CONNECT, ERR_PROTOCOL, etc.), then error code will also be returned in errno.

Definition at line 629 of file comm.cc.

References assert, Comm::COMM_ERROR, DBG_DATA, debugs, Comm::ERR_PROTOCOL, F(), fd_table, Ip::Address::FreeAddr(), Ip::Address::getAddrInfo(), ignoreErrno(), Comm::INPROGRESS, Ip::Address::isIPv4(), MAX_IPSTRLEN, Comm::OK, Ip::Address::port(), StatCounters::sock, statCounter, StatCounters::syscalls, Ip::Address::toStr(), and xstrerr().

Referenced by Comm::ConnOpener::doConnect(), ipc_thread_1(), ipcCreate(), and logfile_mod_udp_open().

comm_empty_os_read_buffers()

static void comm_empty_os_read_buffers ( int  fd )

static

Empty the read buffers

This is a magical routine that empties the read buffers. Under some platforms (Linux) if a buffer has data in it before you call close(), the socket will hang and take quite a while to timeout.

Definition at line 103 of file comm.cc.

References FD_MSGHDR, FD_READ_METHOD(), and fd_table.

Referenced by _comm_close().

comm_exit()

void comm_exit

(

void

)

Definition at line 1155 of file comm.cc.

References TheHalfClosed.

Referenced by SquidShutdown().

comm_has_incomplete_write()

bool comm_has_incomplete_write

(

int

fd

)

Definition at line 152 of file comm.cc.

References assert, COMMIO_FD_WRITECB, and isOpen().

Referenced by PconnPool::push().

comm_import_opened()

void comm_import_opened	(	const Comm::ConnectionPointer &	conn,
		const char *	note,
		struct addrinfo *	AI
	)

Definition at line 549 of file comm.cc.

References assert, comm_init_opened(), COMM_NONBLOCKING, COMM_TRANSPARENT, debugs, Comm::Connection::fd, fd_table, Comm::Connection::flags, and Comm::IsConnOpen().

Referenced by Ipc::ImportFdIntoComm(), and Ipc::SharedListenJoined().

comm_init()

void comm_init

(

void

)

Definition at line 1138 of file comm.cc.

References assert, fd_table, min(), RESERVED_FD, Comm::SelectLoopInit(), Squid_MaxFD, and TheHalfClosed.

Referenced by TestUfs::commonInit(), and SquidMain().

comm_init_opened()

void comm_init_opened ( const Comm::ConnectionPointer &  conn, const char *  note, struct addrinfo *  AI  )

static

Definition at line 448 of file comm.cc.

References assert, debugs, F(), Comm::Connection::fd, fd_open(), FD_SOCKET, fd_table, Comm::IsConnOpen(), isOpen(), and Comm::Connection::local.

Referenced by comm_import_opened(), and comm_openex().

comm_local_port()

unsigned short comm_local_port

(

int

fd

)

Queue a write. handler/handler_data are called when the write fully completes, on error, or on file descriptor close.

Definition at line 165 of file comm.cc.

References DBG_IMPORTANT, debugs, F(), fd_table, Ip::Address::FreeAddr(), Ip::Address::InitAddr(), MYNAME, Ip::Address::port(), Ip::Address::setIPv4(), and xstrerr().

Referenced by comm_udp_sendto(), Dns::Init(), Ftp::Server::listenForDataConnection(), and Ftp::Client::sendEprt().

comm_open()

int comm_open	(	int	sock_type,
		int	proto,
		Ip::Address &	addr,
		int	flags,
		const char *	note
	)

Create a socket. Default is blocking, stream (TCP) socket. IO_TYPE is OR of flags specified in comm.h. Defaults TOS

Definition at line 243 of file comm.cc.

References COMM_DOBIND, COMM_DOBIND_PORT_LATER, comm_openex(), Ip::Address::isAnyAddr(), and Ip::Address::port().

Referenced by Comm::ConnOpener::createFd(), ipc_thread_1(), ipcCreate(), and logfile_mod_udp_open().

comm_open_listener() [1/2]

void comm_open_listener	(	int	sock_type,
		int	proto,
		Comm::ConnectionPointer &	conn,
		const char *	note
	)

Definition at line 257 of file comm.cc.

References COMM_DOBIND, comm_openex(), Comm::Connection::fd, Comm::Connection::flags, and Comm::Connection::local.

Referenced by htcpOpenPorts(), icpOpenPorts(), Dns::Init(), ipcCreate(), Ftp::Gateway::listenForDataChannel(), Ftp::Server::listenForDataConnection(), Ipc::Coordinator::openListenSocket(), Ipc::StartListening(), wccp2ConnectionOpen(), and wccpConnectionOpen().

comm_open_listener() [2/2]

int comm_open_listener	(	int	sock_type,
		int	proto,
		Ip::Address &	addr,
		int	flags,
		const char *	note
	)

Open a port specially bound for listening or sending through a specific port. Please use for all listening sockets and bind() outbound sockets.

It will open a socket bound for:

• IPv4 if IPv6 is disabled or address is IPv4-native.
• IPv6 if address is IPv6-native
• IPv6 dual-stack mode if able to open [::]

When an open performs failover it update the given address to feedback the new IPv4-only status of the socket. Further displays of the IP (in debugs or cachemgr) will occur in Native IPv4 format. A reconfigure is needed to reset the stored IP in most cases and attempt a port re-open.

Definition at line 270 of file comm.cc.

References COMM_DOBIND, and comm_openex().

comm_open_uds()

int comm_open_uds	(	int	sock_type,
		int	proto,
		struct sockaddr_un *	addr,
		int	flags
	)

Definition at line 1674 of file comm.cc.

References assert, comm_close, COMM_DOBIND, COMM_NOCLOEXEC, COMM_NONBLOCKING, COMM_REUSEADDR, commBind(), commSetCloseOnExec(), commSetNonBlocking(), commSetReuseAddr(), commSetTcpRcvbuf(), Config, DBG_CRITICAL, DBG_IMPORTANT, debugs, FD_MSGHDR, fd_open(), fd_table, fdAdjustReserved(), isOpen(), limitError(), MYNAME, Comm::OK, StatCounters::sock, statCounter, SUN_LEN, sockaddr_un::sun_path, StatCounters::syscalls, SquidConfig::tcpRcvBufsz, and xstrerr().

Referenced by Ipc::UdsOp::conn().

comm_openex()

static int comm_openex ( int  sock_type, int  proto, Ip::Address &  addr, int  flags, const char *  note  )

static

Create a socket. Default is blocking, stream (TCP) socket. IO_TYPE is OR of flags specified in defines.h:COMM_*

Definition at line 356 of file comm.cc.

References comm_apply_flags(), comm_init_opened(), comm_set_v6only(), DBG_CRITICAL, DBG_IMPORTANT, debugs, Ip::EnableIpv6, Comm::Connection::fd, fdAdjustReserved(), Ip::Address::FreeAddr(), Ip::Address::getAddrInfo(), IPV6_SPECIAL_SPLITSTACK, IPV6_SPECIAL_V4MAPPING, Ip::Address::isIPv6(), limitError(), Comm::Connection::local, MYNAME, Ip::Address::setIPv4(), StatCounters::sock, statCounter, StatCounters::syscalls, and xstrerr().

Referenced by comm_open(), and comm_open_listener().

comm_remove_close_handler() [1/2]

void comm_remove_close_handler	(	int	fd,
		AsyncCall::Pointer &	call
	)

Definition at line 997 of file comm.cc.

References assert, AsyncCall::cancel(), debugs, AsyncCall::dequeue(), fd_table, isOpen(), and AsyncCall::Next().

comm_remove_close_handler() [2/2]

void comm_remove_close_handler	(	int	fd,
		CLCB *	handler,
		void *	data
	)

Definition at line 968 of file comm.cc.

References assert, debugs, fd_table, isOpen(), and AsyncCall::Next().

Referenced by Comm::ConnOpener::cleanFd(), Snmp::Inquirer::cleanup(), Ftp::Channel::close(), Mgr::StoreToCommWriter::close(), Adaptation::Icap::Xaction::closeConnection(), HttpStateData::closeServer(), FwdState::closeServerConnection(), Http::Tunneler::disconnect(), Log::TcpLogger::disconnect(), Security::PeerConnector::disconnect(), Ftp::Channel::forget(), HttpStateData::proceedAfter1xx(), HttpStateData::processReplyBody(), Mgr::Inquirer::removeCloseHandler(), Snmp::Forwarder::swanSong(), Mgr::Forwarder::swanSong(), Comm::TcpAcceptor::swanSong(), ConnStateData::unpinConnection(), and FwdState::unregister().

comm_reset_close()

void comm_reset_close

(

const Comm::ConnectionPointer &

conn

)

enable linger with time of 0 so that when the socket is closed, TCP generates a RESET

Definition at line 784 of file comm.cc.

References Comm::Connection::close(), commConfigureLinger(), debugs, Comm::Connection::fd, Comm::Connection::id, Comm::IsConnOpen(), and on.

Referenced by ConnStateData::abortChunkedRequestBody(), clientProcessRequestFinished(), Adaptation::Icap::ServiceRep::putConnection(), and ConnStateData::setAuth().

comm_set_transparent()

static void comm_set_transparent ( int  fd )

static

Set the socket option required for TPROXY spoofing for:

• Linux TPROXY v4 support,
• OpenBSD divert-to support,
• FreeBSD IPFW TPROXY v4 support.

Definition at line 313 of file comm.cc.

References DBG_CRITICAL, DBG_IMPORTANT, debugs, enter_suid(), fd_table, leave_suid(), MYNAME, and xstrerr().

Referenced by comm_apply_flags().

comm_set_v6only()

static void comm_set_v6only ( int  fd, int  tos  )

static

Definition at line 294 of file comm.cc.

References DBG_CRITICAL, DBG_IMPORTANT, debugs, MYNAME, and xstrerr().

Referenced by comm_openex().

comm_udp_recv()

int comm_udp_recv	(	int	fd,
		void *	buf,
		size_t	len,
		int	flags
	)

Definition at line 139 of file comm.cc.

References comm_udp_recvfrom().

Referenced by ipcCreate(), and IcmpSquid::Recv().

comm_udp_recvfrom()

int comm_udp_recvfrom	(	int	fd,
		void *	buf,
		size_t	len,
		int	flags,
		Ip::Address &	from
	)

synchronous wrapper around udp socket functions

Definition at line 126 of file comm.cc.

References debugs, Ip::Address::FreeAddr(), Ip::Address::InitAddr(), StatCounters::sock, statCounter, and StatCounters::syscalls.

Referenced by comm_udp_recv(), htcpRecv(), icpHandleUdp(), idnsRead(), snmpHandleUdp(), wccp2HandleUdp(), and wccpHandleUdp().

comm_udp_send()

ssize_t comm_udp_send	(	int	s,
		const void *	buf,
		size_t	len,
		int	flags
	)

Definition at line 146 of file comm.cc.

Referenced by ipcCreate(), IcmpSquid::SendEcho(), wccpAssignBuckets(), and wccpHereIam().

comm_udp_sendto()

int comm_udp_sendto	(	int	fd,
		const Ip::Address &	to_addr,
		const void *	buf,
		int	len
	)

Definition at line 908 of file comm.cc.

References Comm::COMM_ERROR, comm_local_port(), DBG_IMPORTANT, debugs, fd_table, Ip::Address::FreeAddr(), Ip::Address::getAddrInfo(), MYNAME, StatCounters::sock, statCounter, StatCounters::syscalls, and xstrerr().

Referenced by htcpSend(), icpUdpSend(), idnsSendQuery(), Snmp::Forwarder::sendError(), Snmp::Inquirer::sendResponse(), snmpConstructReponse(), wccp2AssignBuckets(), and wccp2HereIam().

commBind()

static Comm::Flag commBind ( int  s, struct addrinfo &  inaddr  )

static

Definition at line 224 of file comm.cc.

References Comm::COMM_ERROR, DBG_CRITICAL, debugs, fd_table, MYNAME, Comm::OK, StatCounters::sock, statCounter, StatCounters::syscalls, and xstrerr().

Referenced by comm_apply_flags(), and comm_open_uds().

commCallCloseHandlers()

void commCallCloseHandlers

(

int

fd

)

Definition at line 741 of file comm.cc.

References AsyncCall::canceled(), debugs, F(), fd_table, AsyncCall::Next(), ScheduleCallHere, and AsyncCall::setNext().

Referenced by _comm_close(), and examine_select().

commCloseAllSockets()

void commCloseAllSockets

(

void

)

Definition at line 1434 of file comm.cc.

References Biggest_FD, debugs, F(), FD_SOCKET, fd_table, old_comm_reset_close(), and ScheduleCallHere.

Referenced by SquidShutdown().

commConfigureLinger()

static void commConfigureLinger ( const int  fd, const OnOff  enabled  )

static

sets SO_LINGER socket(7) option

Parameters

enabled

– whether linger will be active (sets linger::l_onoff)

Definition at line 765 of file comm.cc.

References DBG_CRITICAL, debugs, fd_table, on, and xstrerr().

Referenced by comm_apply_flags(), comm_reset_close(), and old_comm_reset_close().

commHalfClosedCheck()

static void commHalfClosedCheck ( void *  )

static

iterates over all descriptors that may need half-closed tests and calls comm_read for those that do; re-schedules the check if needed

Definition at line 1567 of file comm.cc.

References DescriptorSet::begin(), CallBack(), commPlanHalfClosedCheck(), DescriptorSet::const_iterator, debugs, DescriptorSet::end(), Comm::Connection::fd, fd_table, TheHalfClosed, and WillCheckHalfClosed.

commHalfClosedReader()

static void commHalfClosedReader ( const Comm::ConnectionPointer &  conn, char *  , size_t  size, Comm::Flag  flag, int  , void *    )

static

Definition at line 1616 of file comm.cc.

References assert, Comm::Connection::close(), commHasHalfClosedMonitor(), commPlanHalfClosedCheck(), debugs, Comm::ERR_CLOSING, Comm::Connection::fd, fd_table, Comm::OK, and size.

commHandleWriteHelper()

void commHandleWriteHelper ( void *  data )

static

Definition at line 1164 of file comm.cc.

References assert, CommQuotaQueue::clientInfo, debugs, ClientInfo::eventWaiting, ClientInfo::hasQueue(), BandwidthBucket::selectWaiting, and ClientInfo::writeOrDequeue().

Referenced by ClientInfo::kickQuotaQueue().

commHasHalfClosedMonitor()

bool commHasHalfClosedMonitor

(

int

fd

)

Definition at line 1594 of file comm.cc.

References DescriptorSet::has(), and TheHalfClosed.

Referenced by _comm_close(), commHalfClosedReader(), commIsHalfClosed(), and commStartHalfClosedMonitor().

commPlanHalfClosedCheck()

static void commPlanHalfClosedCheck ( )

static

Definition at line 1555 of file comm.cc.

References commHalfClosedCheck, eventAdd(), TheHalfClosed, and WillCheckHalfClosed.

Referenced by commHalfClosedCheck(), commHalfClosedReader(), and commStartHalfClosedMonitor().

commSetBindAddressNoPort()

static void commSetBindAddressNoPort ( const int  fd )

static

sets the IP_BIND_ADDRESS_NO_PORT socket option to optimize ephemeral port reuse by outgoing TCP connections that must bind(2) to a source IP address

Definition at line 210 of file comm.cc.

References DBG_IMPORTANT, debugs, and xstrerr().

Referenced by comm_apply_flags().

commSetCloseOnExec()

void commSetCloseOnExec

(

int

fd

)

On platforms where FD_CLOEXEC is defined, close the given descriptor during a function call from the exec(3) family. Otherwise, do nothing; the platform itself may close-on-exec by default (e.g., MS Win32 is said to do that at https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873); other platforms are unsupported. Callers that want close-on-exec behavior must call this function on all platforms and are not responsible for the outcome on platforms without FD_CLOEXEC.

Definition at line 1102 of file comm.cc.

References assert, DBG_CRITICAL, debugs, dummy, MYNAME, and xstrerr().

Referenced by comm_apply_flags(), and comm_open_uds().

commSetConnTimeout()

void commSetConnTimeout	(	const Comm::ConnectionPointer &	,
		time_t	seconds,
		AsyncCall::Pointer &
	)

Set or clear the timeout for some action on an active connection. API to replace commSetTimeout() when a Comm::ConnectionPointer is available.

Definition at line 592 of file comm.cc.

References assert, debugs, F(), Comm::Connection::fd, fd_table, Comm::IsConnOpen(), squid_curtime, and Squid_MaxFD.

Referenced by commUnsetConnTimeout(), ConnStateData::extendLifetime(), idnsDoSendQueryVC(), TunnelStateData::keepGoingAfterRead(), Ftp::Client::maybeReadVirginBody(), Security::PeerConnector::noteWantRead(), Helper::Client::openSessions(), HttpStateData::processReplyBody(), IdleConnList::push(), Http::Tunneler::readMore(), Helper::Session::requestTimeout(), ConnStateData::resetReadTimeout(), Ftp::Client::scheduleReadControlReply(), HttpStateData::sendComplete(), HttpStateData::sendRequest(), Ipc::UdsOp::setTimeout(), Http::One::Server::start(), Ftp::Client::switchTimeoutToDataChannel(), tunnelStartShoveling(), TunnelStateData::TunnelStateData(), Adaptation::Icap::Xaction::updateTimeout(), and whoisStart().

commSetNonBlocking()

int commSetNonBlocking

(

int

fd

)

Definition at line 1041 of file comm.cc.

References Comm::COMM_ERROR, DBG_CRITICAL, debugs, dummy, fd_table, MYNAME, SQUID_NONBLOCK, TRUE, and xstrerr().

Referenced by Comm::TcpAcceptor::acceptInto(), comm_apply_flags(), comm_open_uds(), DiskdIOStrategy::init(), CommIO::Initialize(), ipcCreate(), logfile_mod_daemon_flush(), Helper::Client::openSessions(), and statefulhelper::openSessions().

commSetReuseAddr()

static void commSetReuseAddr ( int  fd )

static

Definition at line 1012 of file comm.cc.

References DBG_IMPORTANT, debugs, MYNAME, on, and xstrerr().

Referenced by comm_apply_flags(), and comm_open_uds().

commSetTcpRcvbuf()

static void commSetTcpRcvbuf ( int  fd, int  size  )

static

Definition at line 1022 of file comm.cc.

References DBG_IMPORTANT, debugs, MYNAME, size, and xstrerr().

Referenced by comm_apply_flags(), and comm_open_uds().

commStartHalfClosedMonitor()

void commStartHalfClosedMonitor

(

int

fd

)

The read channel has closed and the caller does not expect more data but needs to detect connection aborts. The current detection method uses 0-length reads: We read until the error occurs or the writer closes the connection. If there is a read error, we close the connection.

Definition at line 1544 of file comm.cc.

References DescriptorSet::add(), assert, commHasHalfClosedMonitor(), commPlanHalfClosedCheck(), CodeContext::Current(), debugs, fd_table, isOpen(), and TheHalfClosed.

Referenced by commMarkHalfClosed().

commStartTlsClose()

static void commStartTlsClose ( const int  fd )

static

Definition at line 804 of file comm.cc.

References fd_table, and Security::SessionSendGoodbye().

Referenced by _comm_close().

commStopHalfClosedMonitor()

void commStopHalfClosedMonitor

(

int const

fd

)

Definition at line 1601 of file comm.cc.

References debugs, DescriptorSet::del(), fd_table, Comm::ReadCancel(), and TheHalfClosed.

Referenced by _comm_close(), and comm_read_base().

commUnsetConnTimeout()

void commUnsetConnTimeout

(

const Comm::ConnectionPointer &

conn

)

Definition at line 616 of file comm.cc.

References commSetConnTimeout(), and debugs.

Referenced by IdleConnList::clearHandlers(), Ipc::UdsOp::clearTimeout(), Adaptation::Icap::Xaction::closeConnection(), Http::Tunneler::disconnect(), Security::PeerConnector::disconnect(), Ftp::Channel::forget(), HttpStateData::processReplyBody(), Ftp::Client::readControlReply(), Ftp::Client::scheduleReadControlReply(), Ftp::Client::switchTimeoutToDataChannel(), and Adaptation::Icap::Xaction::updateTimeout().

commUnsetFdTimeout()

void commUnsetFdTimeout

(

int

fd

)

Definition at line 579 of file comm.cc.

References assert, debugs, F(), fd_table, and Squid_MaxFD.

Referenced by _comm_close(), DiskdIOStrategy::init(), ipcCreate(), IcmpSquid::Open(), and unlinkdInit().

commUnsetNonBlocking()

int commUnsetNonBlocking

(

int

fd

)

Definition at line 1074 of file comm.cc.

References Comm::COMM_ERROR, DBG_CRITICAL, debugs, dummy, FALSE, fd_table, MYNAME, SQUID_NONBLOCK, and xstrerr().

Referenced by ipc_thread_1(), logfile_mod_daemon_flush(), and unlinkdInit().

ignoreErrno()

int ignoreErrno

(

int

ierrno

)

Definition at line 1404 of file comm.cc.

Referenced by Comm::TcpAcceptor::acceptInto(), comm_connect_addr(), Ftp::Client::dataRead(), TunnelStateData::Connection::debugLevelForError(), diskHandleRead(), diskHandleWrite(), Comm::DoSelect(), TunnelStateData::Connection::error(), icpHandleUdp(), idnsRead(), logfileHandleWrite(), Ssl::Bio::read(), Ftp::Client::readControlReply(), Comm::ReadNow(), WhoisState::readReply(), and Ssl::Bio::write().

isOpen()

bool isOpen

(

const int

fd

)

Definition at line 89 of file comm.cc.

References fd_table.

Referenced by _comm_close(), Comm::Connection::close(), comm_has_incomplete_write(), comm_init_opened(), comm_open_uds(), comm_read_cancel(), comm_remove_close_handler(), commStartHalfClosedMonitor(), Comm::TcpAcceptor::doAccept(), Comm::MonitorsRead(), Ftp::Server::noteBodyConsumerAborted(), Comm::Connection::noteClosure(), Http::One::Server::noteMoreBodySpaceAvailable(), Ftp::Server::noteMoreBodySpaceAvailable(), Comm::ReadCancel(), Ftp::Server::startWaitingForOrigin(), and Ftp::Server::stopWaitingForOrigin().

limitError()

static bool limitError ( int const  anErrno )

static

Definition at line 288 of file comm.cc.

Referenced by comm_open_uds(), and comm_openex().

old_comm_reset_close()

void old_comm_reset_close

(

int

fd

)

Definition at line 795 of file comm.cc.

References comm_close, commConfigureLinger(), and on.

Referenced by commCloseAllSockets().

writeTimedOut()

static bool writeTimedOut ( int  fd )

static

Definition at line 1479 of file comm.cc.

References COMMIO_FD_WRITECB, Config, fd_table, squid_curtime, SquidConfig::Timeout, and SquidConfig::write.

Referenced by checkTimeouts().

Variable Documentation

commHalfClosedCheck

EVH commHalfClosedCheck

static

Definition at line 76 of file comm.cc.

Referenced by commPlanHalfClosedCheck().

commHalfClosedReader

IOCB commHalfClosedReader

static

Definition at line 61 of file comm.cc.

TheHalfClosed

DescriptorSet* TheHalfClosed = nullptr

static

Definition at line 74 of file comm.cc.

Referenced by comm_exit(), comm_init(), commHalfClosedCheck(), commHasHalfClosedMonitor(), commPlanHalfClosedCheck(), commStartHalfClosedMonitor(), and commStopHalfClosedMonitor().

WillCheckHalfClosed

bool WillCheckHalfClosed = false

static

Definition at line 75 of file comm.cc.

Referenced by commHalfClosedCheck(), and commPlanHalfClosedCheck().