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/*
* DEBUG: section 05 Socket Functions
* AUTHOR: Harvest Derived
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*
* Copyright (c) 2003, Robert Collins <robertc@squid-cache.org>
*/
#include "squid.h"
#include "StoreIOBuffer.h"
#include "comm.h"
#include "event.h"
#include "fde.h"
#include "CommIO.h"
#include "CommRead.h"
#include "ConnectionDetail.h"
#include "MemBuf.h"
#include "pconn.h"
#include "SquidTime.h"
#include "CommCalls.h"
#include "DescriptorSet.h"
#include "icmp/net_db.h"
#include "ip/IpAddress.h"
#include "ip/IpIntercept.h"
#include "protos.h"
#include "ip/tools.h"
#if defined(_SQUID_CYGWIN_)
#include <sys/ioctl.h>
#endif
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
/*
* New C-like simple comm code. This stuff is a mess and doesn't really buy us anything.
*/
typedef enum {
IOCB_NONE,
IOCB_READ,
IOCB_WRITE
} iocb_type;
static void commStopHalfClosedMonitor(int fd);
static IOCB commHalfClosedReader;
struct comm_io_callback_t {
iocb_type type;
int fd;
AsyncCall::Pointer callback;
char *buf;
FREE *freefunc;
int size;
int offset;
comm_err_t errcode;
int xerrno;
bool active() const { return callback != NULL; }
};
struct _comm_fd {
int fd;
comm_io_callback_t readcb;
comm_io_callback_t writecb;
};
typedef struct _comm_fd comm_fd_t;
comm_fd_t *commfd_table;
// TODO: make this a comm_io_callback_t method?
bool
commio_has_callback(int fd, iocb_type type, comm_io_callback_t *ccb)
{
assert(ccb->fd == fd);
assert(ccb->type == type);
return ccb->active();
}
/*
* Configure comm_io_callback_t for I/O
*
* @param fd filedescriptor
* @param ccb comm io callback
* @param cb callback
* @param cbdata callback data (must be cbdata'ed)
* @param buf buffer, if applicable
* @param freefunc freefunc, if applicable
* @param size buffer size
*/
static void
commio_set_callback(int fd, iocb_type type, comm_io_callback_t *ccb,
AsyncCall::Pointer &cb, char *buf, FREE *freefunc, int size)
{
assert(!ccb->active());
assert(ccb->type == type);
assert(cb != NULL);
ccb->fd = fd;
ccb->callback = cb;
ccb->buf = buf;
ccb->freefunc = freefunc;
ccb->size = size;
ccb->offset = 0;
}
// Schedule the callback call and clear the callback
static void
commio_finish_callback(int fd, comm_io_callback_t *ccb, comm_err_t code, int xerrno)
{
debugs(5, 3, "commio_finish_callback: called for FD " << fd << " (" <<
code << ", " << xerrno << ")");
assert(ccb->active());
assert(ccb->fd == fd);
ccb->errcode = code;
ccb->xerrno = xerrno;
comm_io_callback_t cb = *ccb;
/* We've got a copy; blow away the real one */
/* XXX duplicate code from commio_cancel_callback! */
ccb->xerrno = 0;
ccb->callback = NULL; // cb has it
/* free data */
if (cb.freefunc) {
cb.freefunc(cb.buf);
cb.buf = NULL;
}
if (cb.callback != NULL) {
typedef CommIoCbParams Params;
Params ¶ms = GetCommParams<Params>(cb.callback);
params.fd = cb.fd;
params.buf = cb.buf;
params.size = cb.offset;
params.flag = cb.errcode;
params.xerrno = cb.xerrno;
ScheduleCallHere(cb.callback);
}
}
/*
* Cancel the given callback
*
* Remember that the data is cbdataRef'ed.
*/
// TODO: make this a comm_io_callback_t method
static void
commio_cancel_callback(int fd, comm_io_callback_t *ccb)
{
debugs(5, 3, "commio_cancel_callback: called for FD " << fd);
assert(ccb->fd == fd);
assert(ccb->active());
ccb->xerrno = 0;
ccb->callback = NULL;
}
/*
* Call the given comm callback; assumes the callback is valid.
*
* @param ccb io completion callback
*/
void
commio_call_callback(comm_io_callback_t *ccb)
{
}
class ConnectStateData
{
public:
void *operator new (size_t);
void operator delete (void *);
static void Connect (int fd, void *me);
void connect();
void callCallback(comm_err_t status, int xerrno);
void defaults();
// defaults given by client
char *host;
unsigned short default_port;
IpAddress default_addr;
// NP: CANNOT store the default addr:port together as it gets set/reset differently.
DnsLookupDetails dns; ///< host lookup details
IpAddress S;
AsyncCall::Pointer callback;
int fd;
int tries;
int addrcount;
int connstart;
private:
int commResetFD();
int commRetryConnect();
CBDATA_CLASS(ConnectStateData);
};
/* STATIC */
static DescriptorSet *TheHalfClosed = NULL; /// the set of half-closed FDs
static bool WillCheckHalfClosed = false; /// true if check is scheduled
static EVH commHalfClosedCheck;
static void commPlanHalfClosedCheck();
static comm_err_t commBind(int s, struct addrinfo &);
static void commSetReuseAddr(int);
static void commSetNoLinger(int);
#ifdef TCP_NODELAY
static void commSetTcpNoDelay(int);
#endif
static void commSetTcpRcvbuf(int, int);
static PF commConnectFree;
static PF commHandleWrite;
static IPH commConnectDnsHandle;
static PF comm_accept_try;
class AcceptFD
{
public:
AcceptFD(int aFd = -1): fd(aFd), theCallback(0), mayAcceptMore(false) {}
void subscribe(AsyncCall::Pointer &call);
void acceptNext();
void notify(int newfd, comm_err_t, int xerrno, const ConnectionDetail &);
int fd;
private:
void acceptOne();
AsyncCall::Pointer theCallback;
bool mayAcceptMore;
};
typedef enum {
COMM_CB_READ = 1,
COMM_CB_DERIVED
} comm_callback_t;
struct _fd_debug_t {
char const *close_file;
int close_line;
};
typedef struct _fd_debug_t fd_debug_t;
static MemAllocator *conn_close_pool = NULL;
AcceptFD *fdc_table = NULL; // TODO: rename. And use Vector<>?
fd_debug_t *fdd_table = NULL;
static bool
isOpen(const int fd)
{
return fd_table[fd].flags.open != 0;
}
/**
* Attempt a read
*
* If the read attempt succeeds or fails, call the callback.
* Else, wait for another IO notification.
*/
void
commHandleRead(int fd, void *data)
{
comm_io_callback_t *ccb = (comm_io_callback_t *) data;
assert(data == COMMIO_FD_READCB(fd));
assert(commio_has_callback(fd, IOCB_READ, ccb));
/* Attempt a read */
statCounter.syscalls.sock.reads++;
errno = 0;
int retval;
retval = FD_READ_METHOD(fd, ccb->buf, ccb->size);
debugs(5, 3, "comm_read_try: FD " << fd << ", size " << ccb->size << ", retval " << retval << ", errno " << errno);
if (retval < 0 && !ignoreErrno(errno)) {
debugs(5, 3, "comm_read_try: scheduling COMM_ERROR");
ccb->offset = 0;
commio_finish_callback(fd, ccb, COMM_ERROR, errno);
return;
};
/* See if we read anything */
/* Note - read 0 == socket EOF, which is a valid read */
if (retval >= 0) {
fd_bytes(fd, retval, FD_READ);
ccb->offset = retval;
commio_finish_callback(fd, ccb, COMM_OK, errno);
return;
}
/* Nope, register for some more IO */
commSetSelect(fd, COMM_SELECT_READ, commHandleRead, data, 0);
}
/**
* Queue a read. handler/handler_data are called when the read
* completes, on error, or on file descriptor close.
*/
void
comm_read(int fd, char *buf, int size, IOCB *handler, void *handler_data)
{
AsyncCall::Pointer call = commCbCall(5,4, "SomeCommReadHandler",
CommIoCbPtrFun(handler, handler_data));
comm_read(fd, buf, size, call);
}
void
comm_read(int fd, char *buf, int size, AsyncCall::Pointer &callback)
{
debugs(5, 5, "comm_read, queueing read for FD " << fd << "; asynCall " << callback);
/* Make sure we are open and not closing */
assert(isOpen(fd));
assert(!fd_table[fd].closing());
comm_io_callback_t *ccb = COMMIO_FD_READCB(fd);
// Make sure we are either not reading or just passively monitoring.
// Active/passive conflicts are OK and simply cancel passive monitoring.
if (ccb->active()) {
// if the assertion below fails, we have an active comm_read conflict
assert(fd_table[fd].halfClosedReader != NULL);
commStopHalfClosedMonitor(fd);
assert(!ccb->active());
}
/* Queue the read */
commio_set_callback(fd, IOCB_READ, ccb, callback, (char *)buf, NULL, size);
commSetSelect(fd, COMM_SELECT_READ, commHandleRead, ccb, 0);
}
/**
* 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.
*/
static void
comm_empty_os_read_buffers(int fd)
{
#ifdef _SQUID_LINUX_
/* prevent those nasty RST packets */
char buf[SQUID_TCP_SO_RCVBUF];
if (fd_table[fd].flags.nonblocking == 1) {
while (FD_READ_METHOD(fd, buf, SQUID_TCP_SO_RCVBUF) > 0) {};
}
#endif
}
/**
* Return whether the FD has a pending completed callback.
*/
int
comm_has_pending_read_callback(int fd)
{
assert(isOpen(fd));
// XXX: We do not know whether there is a read callback scheduled.
// This is used for pconn management that should probably be more
// tightly integrated into comm to minimize the chance that a
// closing pconn socket will be used for a new transaction.
return false;
}
// Does comm check this fd for read readiness?
// Note that when comm is not monitoring, there can be a pending callback
// call, which may resume comm monitoring once fired.
bool
comm_monitors_read(int fd)
{
assert(isOpen(fd));
// Being active is usually the same as monitoring because we always
// start monitoring the FD when we configure comm_io_callback_t for I/O
// and we usually configure comm_io_callback_t for I/O when we starting
// monitoring a FD for reading. TODO: replace with commio_has_callback
return COMMIO_FD_READCB(fd)->active();
}
/**
* Cancel a pending read. Assert that we have the right parameters,
* and that there are no pending read events!
*
* XXX: We do not assert that there are no pending read events and
* with async calls it becomes even more difficult.
* The whole interface should be reworked to do callback->cancel()
* instead of searching for places where the callback may be stored and
* updating the state of those places.
*
* AHC Don't call the comm handlers?
*/
void
comm_read_cancel(int fd, IOCB *callback, void *data)
{
if (!isOpen(fd)) {
debugs(5, 4, "comm_read_cancel fails: FD " << fd << " closed");
return;
}
comm_io_callback_t *cb = COMMIO_FD_READCB(fd);
// TODO: is "active" == "monitors FD"?
if (!cb->active()) {
debugs(5, 4, "comm_read_cancel fails: FD " << fd << " inactive");
return;
}
typedef CommCbFunPtrCallT<CommIoCbPtrFun> Call;
Call *call = dynamic_cast<Call*>(cb->callback.getRaw());
if (!call) {
debugs(5, 4, "comm_read_cancel fails: FD " << fd << " lacks callback");
return;
}
call->cancel("old comm_read_cancel");
typedef CommIoCbParams Params;
const Params ¶ms = GetCommParams<Params>(cb->callback);
/* Ok, we can be reasonably sure we won't lose any data here! */
assert(call->dialer.handler == callback);
assert(params.data == data);
/* Delete the callback */
commio_cancel_callback(fd, cb);
/* And the IO event */
commSetSelect(fd, COMM_SELECT_READ, NULL, NULL, 0);
}
void
comm_read_cancel(int fd, AsyncCall::Pointer &callback)
{
callback->cancel("comm_read_cancel");
if (!isOpen(fd)) {
debugs(5, 4, "comm_read_cancel fails: FD " << fd << " closed");
return;
}
comm_io_callback_t *cb = COMMIO_FD_READCB(fd);
if (!cb->active()) {
debugs(5, 4, "comm_read_cancel fails: FD " << fd << " inactive");
return;
}
AsyncCall::Pointer call = cb->callback;
assert(call != NULL); // XXX: should never fail (active() checks for callback==NULL)
/* Ok, we can be reasonably sure we won't lose any data here! */
assert(call == callback);
/* Delete the callback */
commio_cancel_callback(fd, cb);
/* And the IO event */
commSetSelect(fd, COMM_SELECT_READ, NULL, NULL, 0);
}
/**
* synchronous wrapper around udp socket functions
*/
int
comm_udp_recvfrom(int fd, void *buf, size_t len, int flags, IpAddress &from)
{
statCounter.syscalls.sock.recvfroms++;
int x = 0;
struct addrinfo *AI = NULL;
debugs(5,8, "comm_udp_recvfrom: FD " << fd << " from " << from);
assert( NULL == AI );
from.InitAddrInfo(AI);
x = recvfrom(fd, buf, len, flags, AI->ai_addr, &AI->ai_addrlen);
from = *AI;
from.FreeAddrInfo(AI);
return x;
}
int
comm_udp_recv(int fd, void *buf, size_t len, int flags)
{
IpAddress nul;
return comm_udp_recvfrom(fd, buf, len, flags, nul);
}
ssize_t
comm_udp_send(int s, const void *buf, size_t len, int flags)
{
return send(s, buf, len, flags);
}
bool
comm_has_incomplete_write(int fd)
{
assert(isOpen(fd));
return COMMIO_FD_WRITECB(fd)->active();
}
/**
* Queue a write. handler/handler_data are called when the write fully
* completes, on error, or on file descriptor close.
*/
/* Return the local port associated with fd. */
unsigned short
comm_local_port(int fd)
{
IpAddress temp;
struct addrinfo *addr = NULL;
fde *F = &fd_table[fd];
/* If the fd is closed already, just return */
if (!F->flags.open) {
debugs(5, 0, "comm_local_port: FD " << fd << " has been closed.");
return 0;
}
if (F->local_addr.GetPort())
return F->local_addr.GetPort();
if (F->sock_family == AF_INET)
temp.SetIPv4();
temp.InitAddrInfo(addr);
if (getsockname(fd, addr->ai_addr, &(addr->ai_addrlen)) ) {
debugs(50, 1, "comm_local_port: Failed to retrieve TCP/UDP port number for socket: FD " << fd << ": " << xstrerror());
temp.FreeAddrInfo(addr);
return 0;
}
temp = *addr;
temp.FreeAddrInfo(addr);
F->local_addr.SetPort(temp.GetPort());
#if 0 // seems to undo comm_open actions on the FD ...
// grab default socket information for this address
temp.GetAddrInfo(addr);
F->sock_family = addr->ai_family;
temp.FreeAddrInfo(addr);
#endif
debugs(5, 6, "comm_local_port: FD " << fd << ": port " << F->local_addr.GetPort() << "(family=" << F->sock_family << ")");
return F->local_addr.GetPort();
}
static comm_err_t
commBind(int s, struct addrinfo &inaddr)
{
statCounter.syscalls.sock.binds++;
if (bind(s, inaddr.ai_addr, inaddr.ai_addrlen) == 0) {
debugs(50, 6, "commBind: bind socket FD " << s << " to " << fd_table[s].local_addr);
return COMM_OK;
}
debugs(50, 0, "commBind: Cannot bind socket FD " << s << " to " << fd_table[s].local_addr << ": " << xstrerror());
return COMM_ERROR;
}
/**
* Create a socket. Default is blocking, stream (TCP) socket. IO_TYPE
* is OR of flags specified in comm.h. Defaults TOS
*/
int
comm_open(int sock_type,
int proto,
IpAddress &addr,
int flags,
const char *note)
{
return comm_openex(sock_type, proto, addr, flags, 0, note);
}
int
comm_open_listener(int sock_type,
int proto,
IpAddress &addr,
int flags,
const char *note)
{
int sock = -1;
/* all listener sockets require bind() */
flags |= COMM_DOBIND;
/* attempt native enabled port. */
sock = comm_openex(sock_type, proto, addr, flags, 0, note);
return sock;
}
static bool
limitError(int const anErrno)
{
return anErrno == ENFILE || anErrno == EMFILE;
}
int
comm_set_tos(int fd, int tos)
{
#ifdef IP_TOS
int x = setsockopt(fd, IPPROTO_IP, IP_TOS, (char *) &tos, sizeof(int));
if (x < 0)
debugs(50, 1, "comm_set_tos: setsockopt(IP_TOS) on FD " << fd << ": " << xstrerror());
return x;
#else
debugs(50, 0, "WARNING: setsockopt(IP_TOS) not supported on this platform");
return -1;
#endif
}
void
comm_set_v6only(int fd, int tos)
{
#ifdef IPV6_V6ONLY
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (char *) &tos, sizeof(int)) < 0) {
debugs(50, 1, "comm_open: setsockopt(IPV6_V6ONLY) " << (tos?"ON":"OFF") << " for FD " << fd << ": " << xstrerror());
}
#else
debugs(50, 0, "WARNING: comm_open: setsockopt(IPV6_V6ONLY) not supported on this platform");
#endif /* sockopt */
}
/**
* Set the socket IP_TRANSPARENT option for Linux TPROXY v4 support.
*/
void
comm_set_transparent(int fd)
{
#if !LINUX_TPROXY2
#if defined(IP_TRANSPARENT)
int tos = 1;
if (setsockopt(fd, SOL_IP, IP_TRANSPARENT, (char *) &tos, sizeof(int)) < 0) {
debugs(50, DBG_IMPORTANT, "comm_open: setsockopt(IP_TRANSPARENT) on FD " << fd << ": " << xstrerror());
} else {
/* mark the socket as having transparent options */
fd_table[fd].flags.transparent = 1;
}
#else
debugs(50, DBG_CRITICAL, "WARNING: comm_open: setsockopt(IP_TRANSPARENT) not supported on this platform");
#endif /* sockopt */
#endif /* !LINUX_TPROXY2 */
}
/**
* Create a socket. Default is blocking, stream (TCP) socket. IO_TYPE
* is OR of flags specified in defines.h:COMM_*
*/
int
comm_openex(int sock_type,
int proto,
IpAddress &addr,
int flags,
unsigned char TOS,
const char *note)
{
int new_socket;
fde *F = NULL;
int tos = 0;
struct addrinfo *AI = NULL;
PROF_start(comm_open);
/* Create socket for accepting new connections. */
statCounter.syscalls.sock.sockets++;
/* Setup the socket addrinfo details for use */
addr.GetAddrInfo(AI);
AI->ai_socktype = sock_type;
AI->ai_protocol = proto;
debugs(50, 3, "comm_openex: Attempt open socket for: " << addr );
new_socket = socket(AI->ai_family, AI->ai_socktype, AI->ai_protocol);
/* under IPv6 there is the possibility IPv6 is present but disabled. */
/* try again as IPv4-native if possible */
if ( new_socket < 0 && Ip::EnableIpv6 && addr.IsIPv6() && addr.SetIPv4() ) {
/* attempt to open this IPv4-only. */
addr.FreeAddrInfo(AI);
/* Setup the socket addrinfo details for use */
addr.GetAddrInfo(AI);
AI->ai_socktype = sock_type;
AI->ai_protocol = proto;
debugs(50, 3, "comm_openex: Attempt fallback open socket for: " << addr );
new_socket = socket(AI->ai_family, AI->ai_socktype, AI->ai_protocol);
debugs(50, 2, HERE << "attempt open " << note << " socket on: " << addr);
}
if (new_socket < 0) {
/* Increase the number of reserved fd's if calls to socket()
* are failing because the open file table is full. This
* limits the number of simultaneous clients */
if (limitError(errno)) {
debugs(50, DBG_IMPORTANT, "comm_open: socket failure: " << xstrerror());
fdAdjustReserved();
} else {
debugs(50, DBG_CRITICAL, "comm_open: socket failure: " << xstrerror());
}
addr.FreeAddrInfo(AI);
PROF_stop(comm_open);
return -1;
}
debugs(50, 3, "comm_openex: Opened socket FD " << new_socket << " : family=" << AI->ai_family << ", type=" << AI->ai_socktype << ", protocol=" << AI->ai_protocol );
/* set TOS if needed */
if (TOS && comm_set_tos(new_socket, TOS) ) {
tos = TOS;
(void)tos;
}
if ( Ip::EnableIpv6&IPV6_SPECIAL_SPLITSTACK && addr.IsIPv6() )
comm_set_v6only(new_socket, 1);
/* Windows Vista supports Dual-Sockets. BUT defaults them to V6ONLY. Turn it OFF. */
/* Other OS may have this administratively disabled for general use. Same deal. */
if ( Ip::EnableIpv6&IPV6_SPECIAL_V4MAPPING && addr.IsIPv6() )
comm_set_v6only(new_socket, 0);
/* update fdstat */
debugs(5, 5, "comm_open: FD " << new_socket << " is a new socket");
assert(!isOpen(new_socket));
fd_open(new_socket, FD_SOCKET, note);
fdd_table[new_socket].close_file = NULL;
fdd_table[new_socket].close_line = 0;
F = &fd_table[new_socket];
F->local_addr = addr;
F->tos = TOS;
F->sock_family = AI->ai_family;
if (!(flags & COMM_NOCLOEXEC))
commSetCloseOnExec(new_socket);
if ((flags & COMM_REUSEADDR))
commSetReuseAddr(new_socket);
if (addr.GetPort() > (unsigned short) 0) {
#ifdef _SQUID_MSWIN_
if (sock_type != SOCK_DGRAM)
#endif
commSetNoLinger(new_socket);
if (opt_reuseaddr)
commSetReuseAddr(new_socket);
}
/* MUST be done before binding or face OS Error: "(99) Cannot assign requested address"... */
if ((flags & COMM_TRANSPARENT)) {
comm_set_transparent(new_socket);
}
if ( (flags & COMM_DOBIND) || addr.GetPort() > 0 || !addr.IsAnyAddr() ) {
if ( !(flags & COMM_DOBIND) && addr.IsAnyAddr() )
debugs(5,1,"WARNING: Squid is attempting to bind() port " << addr << " without being a listener.");
if ( addr.IsNoAddr() )
debugs(5,0,"CRITICAL: Squid is attempting to bind() port " << addr << "!!");
if (commBind(new_socket, *AI) != COMM_OK) {
comm_close(new_socket);
addr.FreeAddrInfo(AI);
return -1;
PROF_stop(comm_open);
}
}
addr.FreeAddrInfo(AI);
if (flags & COMM_NONBLOCKING)
if (commSetNonBlocking(new_socket) == COMM_ERROR) {
return -1;
PROF_stop(comm_open);
}
#ifdef TCP_NODELAY
if (sock_type == SOCK_STREAM)
commSetTcpNoDelay(new_socket);
#endif
if (Config.tcpRcvBufsz > 0 && sock_type == SOCK_STREAM)
commSetTcpRcvbuf(new_socket, Config.tcpRcvBufsz);
PROF_stop(comm_open);
return new_socket;
}
CBDATA_CLASS_INIT(ConnectStateData);
void *
ConnectStateData::operator new (size_t size)
{
CBDATA_INIT_TYPE(ConnectStateData);
return cbdataAlloc(ConnectStateData);
}
void
ConnectStateData::operator delete (void *address)
{
cbdataFree(address);
}
void
commConnectStart(int fd, const char *host, unsigned short port, AsyncCall::Pointer &cb)
{
debugs(cb->debugSection, cb->debugLevel, "commConnectStart: FD " << fd <<
", cb " << cb << ", " << host << ":" << port); // TODO: just print *cb
ConnectStateData *cs;
cs = new ConnectStateData;
cs->fd = fd;
cs->host = xstrdup(host);
cs->default_port = port;
cs->callback = cb;
comm_add_close_handler(fd, commConnectFree, cs);
ipcache_nbgethostbyname(host, commConnectDnsHandle, cs);
}
// TODO: Remove this and similar callback registration functions by replacing
// (callback,data) parameters with an AsyncCall so that we do not have to use
// a generic call name and debug level when creating an AsyncCall. This will
// also cut the number of callback registration routines in half.
void
commConnectStart(int fd, const char *host, unsigned short port, CNCB * callback, void *data)
{
debugs(5, 5, "commConnectStart: FD " << fd << ", data " << data << ", " << host << ":" << port);
AsyncCall::Pointer call = commCbCall(5,3,
"SomeCommConnectHandler", CommConnectCbPtrFun(callback, data));
commConnectStart(fd, host, port, call);
}
static void
commConnectDnsHandle(const ipcache_addrs *ia, const DnsLookupDetails &details, void *data)
{
ConnectStateData *cs = (ConnectStateData *)data;
cs->dns = details;
if (ia == NULL) {
debugs(5, 3, "commConnectDnsHandle: Unknown host: " << cs->host);
cs->callCallback(COMM_ERR_DNS, 0);
return;
}
assert(ia->cur < ia->count);
cs->default_addr = ia->in_addrs[ia->cur];
if (Config.onoff.balance_on_multiple_ip)
ipcacheCycleAddr(cs->host, NULL);
cs->addrcount = ia->count;
cs->connstart = squid_curtime;
cs->connect();
}
void
ConnectStateData::callCallback(comm_err_t status, int xerrno)
{
debugs(5, 3, "commConnectCallback: FD " << fd);
comm_remove_close_handler(fd, commConnectFree, this);
commSetTimeout(fd, -1, NULL, NULL);
typedef CommConnectCbParams Params;
Params ¶ms = GetCommParams<Params>(callback);
params.fd = fd;
params.dns = dns;
params.flag = status;
params.xerrno = xerrno;
ScheduleCallHere(callback);
callback = NULL;
commConnectFree(fd, this);
}
static void
commConnectFree(int fd, void *data)
{
ConnectStateData *cs = (ConnectStateData *)data;
debugs(5, 3, "commConnectFree: FD " << fd);
// delete cs->callback;
cs->callback = NULL;
safe_free(cs->host);
delete cs;
}
static void
copyFDFlags(int to, fde *F)
{
if (F->flags.close_on_exec)
commSetCloseOnExec(to);
if (F->flags.nonblocking)
commSetNonBlocking(to);
#ifdef TCP_NODELAY
if (F->flags.nodelay)
commSetTcpNoDelay(to);
#endif
if (Config.tcpRcvBufsz > 0)
commSetTcpRcvbuf(to, Config.tcpRcvBufsz);
}
/* Reset FD so that we can connect() again */
int
ConnectStateData::commResetFD()
{
// XXX: do we have to check this?
//
// if (!cbdataReferenceValid(callback.data))
// return 0;
statCounter.syscalls.sock.sockets++;
fde *F = &fd_table[fd];
struct addrinfo *AI = NULL;
F->local_addr.GetAddrInfo(AI);
int new_family = AI->ai_family;
int fd2 = socket(new_family, AI->ai_socktype, AI->ai_protocol);
if (fd2 < 0) {
debugs(5, DBG_CRITICAL, HERE << "WARNING: FD " << fd2 << " socket failed to allocate: " << xstrerror());
if (ENFILE == errno || EMFILE == errno)
fdAdjustReserved();
F->local_addr.FreeAddrInfo(AI);
return 0;
}
#ifdef _SQUID_MSWIN_
/* On Windows dup2() can't work correctly on Sockets, the */
/* workaround is to close the destination Socket before call them. */
close(fd);
#endif
if (dup2(fd2, fd) < 0) {
debugs(5, DBG_CRITICAL, HERE << "WARNING: dup2(FD " << fd2 << ", FD " << fd << ") failed: " << xstrerror());
if (ENFILE == errno || EMFILE == errno)
fdAdjustReserved();
close(fd2);
F->local_addr.FreeAddrInfo(AI);
return 0;
}
commResetSelect(fd);
close(fd2);
debugs(50, 3, "commResetFD: Reset socket FD " << fd << "->" << fd2 << " : family=" << new_family );
debugs(50, 3, "commResetFD: Reset socket FD " << fd << "->" << fd2 << " : family=" << new_family );
/* INET6: copy the new sockets family type to the FDE table */
F->sock_family = new_family;
F->flags.called_connect = 0;
/*
* yuck, this has assumptions about comm_open() arguments for
* the original socket
*/
/* MUST be done before binding or face OS Error: "(99) Cannot assign requested address"... */
if ( F->flags.transparent ) {
comm_set_transparent(fd);
}
if (commBind(fd, *AI) != COMM_OK) {
debugs(5, DBG_CRITICAL, "WARNING: Reset of FD " << fd << " for " << F->local_addr << " failed to bind: " << xstrerror());
F->local_addr.FreeAddrInfo(AI);
return 0;
}
F->local_addr.FreeAddrInfo(AI);
if (F->tos)
comm_set_tos(fd, F->tos);
if ( Ip::EnableIpv6&IPV6_SPECIAL_SPLITSTACK && F->local_addr.IsIPv6() )
comm_set_v6only(fd, 1);
copyFDFlags(fd, F);
return 1;
}
int
ConnectStateData::commRetryConnect()
{
assert(addrcount > 0);
if (addrcount == 1) {
if (tries >= Config.retry.maxtries)
return 0;
if (squid_curtime - connstart > Config.Timeout.connect)
return 0;
} else {
if (tries > addrcount) {
/* Flush bad address count in case we are
* skipping over incompatible protocol
*/
ipcacheMarkAllGood(host);
return 0;
}
}
return commResetFD();
}
static void
commReconnect(void *data)
{
ConnectStateData *cs = (ConnectStateData *)data;
ipcache_nbgethostbyname(cs->host, commConnectDnsHandle, cs);
}
/** Connect SOCK to specified DEST_PORT at DEST_HOST. */
void
ConnectStateData::Connect(int fd, void *me)
{
ConnectStateData *cs = (ConnectStateData *)me;
assert (cs->fd == fd);
cs->connect();
}
void
ConnectStateData::defaults()
{
S = default_addr;
S.SetPort(default_port);
}
void
ConnectStateData::connect()
{
defaults();
debugs(5,5, HERE << "to " << S);
switch (comm_connect_addr(fd, S) ) {
case COMM_INPROGRESS:
debugs(5, 5, HERE << "FD " << fd << ": COMM_INPROGRESS");
commSetSelect(fd, COMM_SELECT_WRITE, ConnectStateData::Connect, this, 0);
break;
case COMM_OK:
debugs(5, 5, HERE << "FD " << fd << ": COMM_OK - connected");
ipcacheMarkGoodAddr(host, S);
callCallback(COMM_OK, 0);
break;
case COMM_ERR_PROTOCOL:
debugs(5, 5, HERE "FD " << fd << ": COMM_ERR_PROTOCOL - try again");
/* problem using the desired protocol over this socket.
* skip to the next address and hope it's more compatible
* but do not mark the current address as bad
*/
tries++;
if (commRetryConnect()) {
/* Force an addr cycle to move forward to the next possible address */
ipcacheCycleAddr(host, NULL);
eventAdd("commReconnect", commReconnect, this, this->addrcount == 1 ? 0.05 : 0.0, 0);
} else {
debugs(5, 5, HERE << "FD " << fd << ": COMM_ERR_PROTOCOL - ERR tried too many times already.");
callCallback(COMM_ERR_CONNECT, errno);
}
break;
default:
debugs(5, 5, HERE "FD " << fd << ": * - try again");
tries++;
ipcacheMarkBadAddr(host, S);
#if USE_ICMP
if (Config.onoff.test_reachability)
netdbDeleteAddrNetwork(S);
#endif
if (commRetryConnect()) {
eventAdd("commReconnect", commReconnect, this, this->addrcount == 1 ? 0.05 : 0.0, 0);
} else {
debugs(5, 5, HERE << "FD " << fd << ": * - ERR tried too many times already.");
callCallback(COMM_ERR_CONNECT, errno);
}
}
}
/*
int
commSetTimeout_old(int fd, int timeout, PF * handler, void *data)
{
debugs(5, 3, HERE << "FD " << fd << " timeout " << timeout);
assert(fd >= 0);
assert(fd < Squid_MaxFD);
fde *F = &fd_table[fd];
assert(F->flags.open);
if (timeout < 0) {
cbdataReferenceDone(F->timeout_data);
F->timeout_handler = NULL;
F->timeout = 0;
} else {
if (handler) {
cbdataReferenceDone(F->timeout_data);
F->timeout_handler = handler;
F->timeout_data = cbdataReference(data);
}
F->timeout = squid_curtime + (time_t) timeout;
}
return F->timeout;
}
*/
int
commSetTimeout(int fd, int timeout, PF * handler, void *data)
{
AsyncCall::Pointer call;
debugs(5, 3, HERE << "FD " << fd << " timeout " << timeout);
if (handler != NULL)
call=commCbCall(5,4, "SomeTimeoutHandler", CommTimeoutCbPtrFun(handler, data));
else
call = NULL;
return commSetTimeout(fd, timeout, call);
}
int commSetTimeout(int fd, int timeout, AsyncCall::Pointer &callback)
{
debugs(5, 3, HERE << "FD " << fd << " timeout " << timeout);
assert(fd >= 0);
assert(fd < Squid_MaxFD);
fde *F = &fd_table[fd];
assert(F->flags.open);
if (timeout < 0) {
F->timeoutHandler = NULL;
F->timeout = 0;
} else {
if (callback != NULL) {
typedef CommTimeoutCbParams Params;
Params ¶ms = GetCommParams<Params>(callback);
params.fd = fd;
F->timeoutHandler = callback;
}
F->timeout = squid_curtime + (time_t) timeout;
}
return F->timeout;
}
int
comm_connect_addr(int sock, const IpAddress &address)
{
comm_err_t status = COMM_OK;
fde *F = &fd_table[sock];
int x = 0;
int err = 0;
socklen_t errlen;
struct addrinfo *AI = NULL;
PROF_start(comm_connect_addr);
assert(address.GetPort() != 0);
debugs(5, 9, "comm_connect_addr: connecting socket " << sock << " to " << address << " (want family: " << F->sock_family << ")");
/* Handle IPv6 over IPv4-only socket case.
* this case must presently be handled here since the GetAddrInfo asserts on bad mappings.
* NP: because commResetFD is private to ConnStateData we have to return an error and
* trust its handled properly.
*/
if (F->sock_family == AF_INET && !address.IsIPv4()) {
errno = ENETUNREACH;
return COMM_ERR_PROTOCOL;
}
/* Handle IPv4 over IPv6-only socket case.
* This case is presently handled here as it's both a known case and it's
* uncertain what error will be returned by the IPv6 stack in such case. It's
* possible this will also be handled by the errno checks below after connect()
* but needs carefull cross-platform verification, and verifying the address
* condition here is simple.
*/
if (!F->local_addr.IsIPv4() && address.IsIPv4()) {
errno = ENETUNREACH;
return COMM_ERR_PROTOCOL;
}
address.GetAddrInfo(AI, F->sock_family);
/* Establish connection. */
errno = 0;
if (!F->flags.called_connect) {
F->flags.called_connect = 1;
statCounter.syscalls.sock.connects++;
x = connect(sock, AI->ai_addr, AI->ai_addrlen);
// XXX: ICAP code refuses callbacks during a pending comm_ call
// Async calls development will fix this.
if (x == 0) {
x = -1;
errno = EINPROGRESS;
}
if (x < 0) {
debugs(5,5, "comm_connect_addr: sock=" << sock << ", addrinfo( " <<
" flags=" << AI->ai_flags <<
", family=" << AI->ai_family <<
", socktype=" << AI->ai_socktype <<
", protocol=" << AI->ai_protocol <<
", &addr=" << AI->ai_addr <<
", addrlen=" << AI->ai_addrlen <<
" )" );
debugs(5, 9, "connect FD " << sock << ": (" << x << ") " << xstrerror());
debugs(14,9, "connecting to: " << address );
}
} else {
#if defined(_SQUID_NEWSOS6_)
/* Makoto MATSUSHITA <matusita@ics.es.osaka-u.ac.jp> */
connect(sock, AI->ai_addr, AI->ai_addrlen);
if (errno == EINVAL) {
errlen = sizeof(err);
x = getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &errlen);
if (x >= 0)
errno = x;
}
#else
errlen = sizeof(err);
x = getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &errlen);
if (x == 0)
errno = err;
#if defined(_SQUID_SOLARIS_)
/*
* Solaris 2.4's socket emulation doesn't allow you
* to determine the error from a failed non-blocking
* connect and just returns EPIPE. Create a fake
* error message for connect. -- fenner@parc.xerox.com
*/
if (x < 0 && errno == EPIPE)
errno = ENOTCONN;
#endif
#endif
}
/* Squid seems to be working fine without this code. With this code,
* we leak memory on many connect requests because of EINPROGRESS.
* If you find that this code is needed, please file a bug report. */
#if 0
#ifdef _SQUID_LINUX_
/* 2007-11-27:
* Linux Debian replaces our allocated AI pointer with garbage when
* connect() fails. This leads to segmentation faults deallocating
* the system-allocated memory when we go to clean up our pointer.
* HACK: is to leak the memory returned since we can't deallocate.
*/
if (errno != 0) {
AI = NULL;
}
#endif
#endif
address.FreeAddrInfo(AI);
PROF_stop(comm_connect_addr);
if (errno == 0 || errno == EISCONN)
status = COMM_OK;
else if (ignoreErrno(errno))
status = COMM_INPROGRESS;
else if (errno == EAFNOSUPPORT || errno == EINVAL)
return COMM_ERR_PROTOCOL;
else
return COMM_ERROR;
address.NtoA(F->ipaddr, MAX_IPSTRLEN);
F->remote_port = address.GetPort(); /* remote_port is HS */
if (status == COMM_OK) {
debugs(5, 10, "comm_connect_addr: FD " << sock << " connected to " << address);
} else if (status == COMM_INPROGRESS) {
debugs(5, 10, "comm_connect_addr: FD " << sock << " connection pending");
}
return status;
}
/* Wait for an incoming connection on FD. FD should be a socket returned
* from comm_listen. */
static int
comm_old_accept(int fd, ConnectionDetail &details)
{
PROF_start(comm_accept);
statCounter.syscalls.sock.accepts++;
int sock;
struct addrinfo *gai = NULL;
details.me.InitAddrInfo(gai);
if ((sock = accept(fd, gai->ai_addr, &gai->ai_addrlen)) < 0) {
details.me.FreeAddrInfo(gai);
PROF_stop(comm_accept);
if (ignoreErrno(errno)) {
debugs(50, 5, "comm_old_accept: FD " << fd << ": " << xstrerror());
return COMM_NOMESSAGE;
} else if (ENFILE == errno || EMFILE == errno) {
debugs(50, 3, "comm_old_accept: FD " << fd << ": " << xstrerror());
return COMM_ERROR;
} else {
debugs(50, 1, "comm_old_accept: FD " << fd << ": " << xstrerror());
return COMM_ERROR;
}
}
details.peer = *gai;
if ( Config.client_ip_max_connections >= 0) {
if (clientdbEstablished(details.peer, 0) > Config.client_ip_max_connections) {
debugs(50, DBG_IMPORTANT, "WARNING: " << details.peer << " attempting more than " << Config.client_ip_max_connections << " connections.");
details.me.FreeAddrInfo(gai);
return COMM_ERROR;
}
}
details.me.InitAddrInfo(gai);
details.me.SetEmpty();
getsockname(sock, gai->ai_addr, &gai->ai_addrlen);
details.me = *gai;
commSetCloseOnExec(sock);
/* fdstat update */
fd_open(sock, FD_SOCKET, "HTTP Request");
fdd_table[sock].close_file = NULL;
fdd_table[sock].close_line = 0;
fde *F = &fd_table[sock];
details.peer.NtoA(F->ipaddr,MAX_IPSTRLEN);
F->remote_port = details.peer.GetPort();
F->local_addr.SetPort(details.me.GetPort());
F->sock_family = details.me.IsIPv6()?AF_INET6:AF_INET;
details.me.FreeAddrInfo(gai);
commSetNonBlocking(sock);
/* IFF the socket is (tproxy) transparent, pass the flag down to allow spoofing */
F->flags.transparent = fd_table[fd].flags.transparent;
PROF_stop(comm_accept);
return sock;
}
void
commCallCloseHandlers(int fd)
{
fde *F = &fd_table[fd];
debugs(5, 5, "commCallCloseHandlers: FD " << fd);
while (F->closeHandler != NULL) {
AsyncCall::Pointer call = F->closeHandler;
F->closeHandler = call->Next();
call->setNext(NULL);
// If call is not canceled schedule it for execution else ignore it
if (!call->canceled()) {
debugs(5, 5, "commCallCloseHandlers: ch->handler=" << call);
typedef CommCloseCbParams Params;
Params ¶ms = GetCommParams<Params>(call);
params.fd = fd;
ScheduleCallHere(call);
}
}
}
#if LINGERING_CLOSE
static void
commLingerClose(int fd, void *unused)
{
LOCAL_ARRAY(char, buf, 1024);
int n;
n = FD_READ_METHOD(fd, buf, 1024);
if (n < 0)
debugs(5, 3, "commLingerClose: FD " << fd << " read: " << xstrerror());
comm_close(fd);
}
static void
commLingerTimeout(int fd, void *unused)
{
debugs(5, 3, "commLingerTimeout: FD " << fd);
comm_close(fd);
}
/*
* Inspired by apache
*/
void
comm_lingering_close(int fd)
{
#if USE_SSL
if (fd_table[fd].ssl)
ssl_shutdown_method(fd);
#endif
if (shutdown(fd, 1) < 0) {
comm_close(fd);
return;
}
fd_note(fd, "lingering close");
commSetTimeout(fd, 10, commLingerTimeout, NULL);
commSetSelect(fd, COMM_SELECT_READ, commLingerClose, NULL, 0);
}
#endif
/*
* enable linger with time of 0 so that when the socket is
* closed, TCP generates a RESET
*/
void
comm_reset_close(int fd)
{
struct linger L;
L.l_onoff = 1;
L.l_linger = 0;
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *) &L, sizeof(L)) < 0)
debugs(50, DBG_CRITICAL, "ERROR: Closing FD " << fd << " with TCP RST: " << xstrerror());
comm_close(fd);
}
void
comm_close_start(int fd, void *data)
{
#if USE_SSL
fde *F = &fd_table[fd];
if (F->ssl)
ssl_shutdown_method(fd);
#endif
}
void
comm_close_complete(int fd, void *data)
{
#if USE_SSL
fde *F = &fd_table[fd];
if (F->ssl) {
SSL_free(F->ssl);
F->ssl = NULL;
}
if (F->dynamicSslContext) {
SSL_CTX_free(F->dynamicSslContext);
F->dynamicSslContext = NULL;
}
#endif
fd_close(fd); /* update fdstat */
close(fd);
fdc_table[fd] = AcceptFD(fd);
statCounter.syscalls.sock.closes++;
/* When an fd closes, give accept() a chance, if need be */
if (fdNFree() >= RESERVED_FD)
AcceptLimiter::Instance().kick();
}
/*
* Close the socket fd.
*
* + call write handlers with ERR_CLOSING
* + call read handlers with ERR_CLOSING
* + call closing handlers
*
* NOTE: COMM_ERR_CLOSING will NOT be called for CommReads' sitting in a
* DeferredReadManager.
*/
void
_comm_close(int fd, char const *file, int line)
{
debugs(5, 3, "comm_close: start closing FD " << fd);
assert(fd >= 0);
assert(fd < Squid_MaxFD);
fde *F = &fd_table[fd];
fdd_table[fd].close_file = file;
fdd_table[fd].close_line = line;
if (F->closing())
return;
/* XXX: is this obsolete behind F->closing() ? */
if ( (shutting_down || reconfiguring) && (!F->flags.open || F->type == FD_FILE))
return;
/* The following fails because ipc.c is doing calls to pipe() to create sockets! */
assert(isOpen(fd));
assert(F->type != FD_FILE);
PROF_start(comm_close);
F->flags.close_request = 1;
AsyncCall::Pointer startCall=commCbCall(5,4, "comm_close_start",
CommCloseCbPtrFun(comm_close_start, NULL));
typedef CommCloseCbParams Params;
Params &startParams = GetCommParams<Params>(startCall);
startParams.fd = fd;
ScheduleCallHere(startCall);
// a half-closed fd may lack a reader, so we stop monitoring explicitly
if (commHasHalfClosedMonitor(fd))
commStopHalfClosedMonitor(fd);
commSetTimeout(fd, -1, NULL, NULL);
// notify read/write handlers after canceling select reservations, if any
if (commio_has_callback(fd, IOCB_WRITE, COMMIO_FD_WRITECB(fd))) {
commSetSelect(fd, COMM_SELECT_WRITE, NULL, NULL, 0);
commio_finish_callback(fd, COMMIO_FD_WRITECB(fd), COMM_ERR_CLOSING, errno);
}
if (commio_has_callback(fd, IOCB_READ, COMMIO_FD_READCB(fd))) {
commSetSelect(fd, COMM_SELECT_READ, NULL, NULL, 0);
commio_finish_callback(fd, COMMIO_FD_READCB(fd), COMM_ERR_CLOSING, errno);
}
// notify accept handlers
fdc_table[fd].notify(-1, COMM_ERR_CLOSING, 0, ConnectionDetail());
commCallCloseHandlers(fd);
if (F->pconn.uses)
F->pconn.pool->count(F->pconn.uses);
comm_empty_os_read_buffers(fd);
AsyncCall::Pointer completeCall=commCbCall(5,4, "comm_close_complete",
CommCloseCbPtrFun(comm_close_complete, NULL));
Params &completeParams = GetCommParams<Params>(completeCall);
completeParams.fd = fd;
// must use async call to wait for all callbacks
// scheduled before comm_close() to finish
ScheduleCallHere(completeCall);
PROF_stop(comm_close);
}
/* Send a udp datagram to specified TO_ADDR. */
int
comm_udp_sendto(int fd,
const IpAddress &to_addr,
const void *buf,
int len)
{
int x = 0;
struct addrinfo *AI = NULL;
PROF_start(comm_udp_sendto);
statCounter.syscalls.sock.sendtos++;
debugs(50, 3, "comm_udp_sendto: Attempt to send UDP packet to " << to_addr <<
" using FD " << fd << " using Port " << comm_local_port(fd) );
/* BUG: something in the above macro appears to occasionally be setting AI to garbage. */
/* AYJ: 2007-08-27 : or was it because I wasn't then setting 'fd_table[fd].sock_family' to fill properly. */
assert( NULL == AI );
to_addr.GetAddrInfo(AI, fd_table[fd].sock_family);
x = sendto(fd, buf, len, 0, AI->ai_addr, AI->ai_addrlen);
to_addr.FreeAddrInfo(AI);
PROF_stop(comm_udp_sendto);
if (x >= 0)
return x;
#ifdef _SQUID_LINUX_
if (ECONNREFUSED != errno)
#endif
debugs(50, 1, "comm_udp_sendto: FD " << fd << ", (family=" << fd_table[fd].sock_family << ") " << to_addr << ": " << xstrerror());
return COMM_ERROR;
}
void
comm_add_close_handler(int fd, PF * handler, void *data)
{
debugs(5, 5, "comm_add_close_handler: FD " << fd << ", handler=" <<
handler << ", data=" << data);
AsyncCall::Pointer call=commCbCall(5,4, "SomeCloseHandler",
CommCloseCbPtrFun(handler, data));
comm_add_close_handler(fd, call);
}
void
comm_add_close_handler(int fd, AsyncCall::Pointer &call)
{
debugs(5, 5, "comm_add_close_handler: FD " << fd << ", AsyncCall=" << call);
/*TODO:Check for a similar scheduled AsyncCall*/
// for (c = fd_table[fd].closeHandler; c; c = c->next)
// assert(c->handler != handler || c->data != data);
call->setNext(fd_table[fd].closeHandler);
fd_table[fd].closeHandler = call;
}
// remove function-based close handler
void
comm_remove_close_handler(int fd, PF * handler, void *data)
{
assert (isOpen(fd));
/* Find handler in list */
debugs(5, 5, "comm_remove_close_handler: FD " << fd << ", handler=" <<
handler << ", data=" << data);
AsyncCall::Pointer p, prev = NULL;
for (p = fd_table[fd].closeHandler; p != NULL; prev = p, p = p->Next()) {
typedef CommCbFunPtrCallT<CommCloseCbPtrFun> Call;
const Call *call = dynamic_cast<const Call*>(p.getRaw());
if (!call) // method callbacks have their own comm_remove_close_handler
continue;
typedef CommCloseCbParams Params;
const Params ¶ms = GetCommParams<Params>(p);
if (call->dialer.handler == handler && params.data == data)
break; /* This is our handler */
}
// comm_close removes all close handlers so our handler may be gone
if (p != NULL) {
p->dequeue(fd_table[fd].closeHandler, prev);
p->cancel("comm_remove_close_handler");
}
}
// remove method-based close handler
void
comm_remove_close_handler(int fd, AsyncCall::Pointer &call)
{
assert (isOpen(fd));
debugs(5, 5, "comm_remove_close_handler: FD " << fd << ", AsyncCall=" << call);
// comm_close removes all close handlers so our handler may be gone
AsyncCall::Pointer p, prev = NULL;
for (p = fd_table[fd].closeHandler; p != NULL && p != call; prev = p, p = p->Next());
if (p != NULL)
p->dequeue(fd_table[fd].closeHandler, prev);
call->cancel("comm_remove_close_handler");
}
static void
commSetNoLinger(int fd)
{
struct linger L;
L.l_onoff = 0; /* off */
L.l_linger = 0;
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *) &L, sizeof(L)) < 0)
debugs(50, 0, "commSetNoLinger: FD " << fd << ": " << xstrerror());
fd_table[fd].flags.nolinger = 1;
}
static void
commSetReuseAddr(int fd)
{
int on = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) < 0)
debugs(50, 1, "commSetReuseAddr: FD " << fd << ": " << xstrerror());
}
static void
commSetTcpRcvbuf(int fd, int size)
{
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof(size)) < 0)
debugs(50, 1, "commSetTcpRcvbuf: FD " << fd << ", SIZE " << size << ": " << xstrerror());
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *) &size, sizeof(size)) < 0)
debugs(50, 1, "commSetTcpRcvbuf: FD " << fd << ", SIZE " << size << ": " << xstrerror());
#ifdef TCP_WINDOW_CLAMP
if (setsockopt(fd, SOL_TCP, TCP_WINDOW_CLAMP, (char *) &size, sizeof(size)) < 0)
debugs(50, 1, "commSetTcpRcvbuf: FD " << fd << ", SIZE " << size << ": " << xstrerror());
#endif
}
int
commSetNonBlocking(int fd)
{
#ifndef _SQUID_MSWIN_
int flags;
int dummy = 0;
#endif
#ifdef _SQUID_WIN32_
int nonblocking = TRUE;
#ifdef _SQUID_CYGWIN_
if (fd_table[fd].type != FD_PIPE) {
#endif
if (ioctl(fd, FIONBIO, &nonblocking) < 0) {
debugs(50, 0, "commSetNonBlocking: FD " << fd << ": " << xstrerror() << " " << fd_table[fd].type);
return COMM_ERROR;
}
#ifdef _SQUID_CYGWIN_
} else {
#endif
#endif
#ifndef _SQUID_MSWIN_
if ((flags = fcntl(fd, F_GETFL, dummy)) < 0) {
debugs(50, 0, "FD " << fd << ": fcntl F_GETFL: " << xstrerror());
return COMM_ERROR;
}
if (fcntl(fd, F_SETFL, flags | SQUID_NONBLOCK) < 0) {
debugs(50, 0, "commSetNonBlocking: FD " << fd << ": " << xstrerror());
return COMM_ERROR;
}
#endif
#ifdef _SQUID_CYGWIN_
}
#endif
fd_table[fd].flags.nonblocking = 1;
return 0;
}
int
commUnsetNonBlocking(int fd)
{
#ifdef _SQUID_MSWIN_
int nonblocking = FALSE;
if (ioctlsocket(fd, FIONBIO, (unsigned long *) &nonblocking) < 0) {
#else
int flags;
int dummy = 0;
if ((flags = fcntl(fd, F_GETFL, dummy)) < 0) {
debugs(50, 0, "FD " << fd << ": fcntl F_GETFL: " << xstrerror());
return COMM_ERROR;
}
if (fcntl(fd, F_SETFL, flags & (~SQUID_NONBLOCK)) < 0) {
#endif
debugs(50, 0, "commUnsetNonBlocking: FD " << fd << ": " << xstrerror());
return COMM_ERROR;
}
fd_table[fd].flags.nonblocking = 0;
return 0;
}
void
commSetCloseOnExec(int fd)
{
#ifdef FD_CLOEXEC
int flags;
int dummy = 0;
if ((flags = fcntl(fd, F_GETFD, dummy)) < 0) {
debugs(50, 0, "FD " << fd << ": fcntl F_GETFD: " << xstrerror());
return;
}
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
debugs(50, 0, "FD " << fd << ": set close-on-exec failed: " << xstrerror());
fd_table[fd].flags.close_on_exec = 1;
#endif
}
#ifdef TCP_NODELAY
static void
commSetTcpNoDelay(int fd)
{
int on = 1;
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &on, sizeof(on)) < 0)
debugs(50, 1, "commSetTcpNoDelay: FD " << fd << ": " << xstrerror());
fd_table[fd].flags.nodelay = 1;
}
#endif
void
commSetTcpKeepalive(int fd, int idle, int interval, int timeout)
{
int on = 1;
#ifdef TCP_KEEPCNT
if (timeout && interval) {
int count = (timeout + interval - 1) / interval;
if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &count, sizeof(on)) < 0)
debugs(5, 1, "commSetKeepalive: FD " << fd << ": " << xstrerror());
}
#endif
#ifdef TCP_KEEPIDLE
if (idle) {
if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &idle, sizeof(on)) < 0)
debugs(5, 1, "commSetKeepalive: FD " << fd << ": " << xstrerror());
}
#endif
#ifdef TCP_KEEPINTVL
if (interval) {
if (setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &interval, sizeof(on)) < 0)
debugs(5, 1, "commSetKeepalive: FD " << fd << ": " << xstrerror());
}
#endif
if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (char *) &on, sizeof(on)) < 0)
debugs(5, 1, "commSetKeepalive: FD " << fd << ": " << xstrerror());
}
void
comm_init(void)
{
fd_table =(fde *) xcalloc(Squid_MaxFD, sizeof(fde));
fdd_table = (fd_debug_t *)xcalloc(Squid_MaxFD, sizeof(fd_debug_t));
fdc_table = new AcceptFD[Squid_MaxFD];
for (int pos = 0; pos < Squid_MaxFD; ++pos) {
fdc_table[pos] = AcceptFD(pos);
}
commfd_table = (comm_fd_t *) xcalloc(Squid_MaxFD, sizeof(comm_fd_t));
for (int pos = 0; pos < Squid_MaxFD; pos++) {
commfd_table[pos].fd = pos;
commfd_table[pos].readcb.fd = pos;
commfd_table[pos].readcb.type = IOCB_READ;
commfd_table[pos].writecb.fd = pos;
commfd_table[pos].writecb.type = IOCB_WRITE;
}
/* XXX account fd_table */
/* Keep a few file descriptors free so that we don't run out of FD's
* after accepting a client but before it opens a socket or a file.
* Since Squid_MaxFD can be as high as several thousand, don't waste them */
RESERVED_FD = min(100, Squid_MaxFD / 4);
conn_close_pool = memPoolCreate("close_handler", sizeof(close_handler));
TheHalfClosed = new DescriptorSet;
}
void
comm_exit(void)
{
delete TheHalfClosed;
TheHalfClosed = NULL;
safe_free(fd_table);
safe_free(fdd_table);
if (fdc_table) {
delete[] fdc_table;
fdc_table = NULL;
}
safe_free(commfd_table);
}
/* Write to FD. */
static void
commHandleWrite(int fd, void *data)
{
comm_io_callback_t *state = (comm_io_callback_t *)data;
int len = 0;
int nleft;
assert(state == COMMIO_FD_WRITECB(fd));
PROF_start(commHandleWrite);
debugs(5, 5, "commHandleWrite: FD " << fd << ": off " <<
(long int) state->offset << ", sz " << (long int) state->size << ".");
nleft = state->size - state->offset;
len = FD_WRITE_METHOD(fd, state->buf + state->offset, nleft);
debugs(5, 5, "commHandleWrite: write() returns " << len);
fd_bytes(fd, len, FD_WRITE);
statCounter.syscalls.sock.writes++;
if (len == 0) {
/* Note we even call write if nleft == 0 */
/* We're done */
if (nleft != 0)
debugs(5, 1, "commHandleWrite: FD " << fd << ": write failure: connection closed with " << nleft << " bytes remaining.");
commio_finish_callback(fd, COMMIO_FD_WRITECB(fd), nleft ? COMM_ERROR : COMM_OK, errno);
} else if (len < 0) {
/* An error */
if (fd_table[fd].flags.socket_eof) {
debugs(50, 2, "commHandleWrite: FD " << fd << ": write failure: " << xstrerror() << ".");
commio_finish_callback(fd, COMMIO_FD_WRITECB(fd), nleft ? COMM_ERROR : COMM_OK, errno);
} else if (ignoreErrno(errno)) {
debugs(50, 10, "commHandleWrite: FD " << fd << ": write failure: " << xstrerror() << ".");
commSetSelect(fd,
COMM_SELECT_WRITE,
commHandleWrite,
state,
0);
} else {
debugs(50, 2, "commHandleWrite: FD " << fd << ": write failure: " << xstrerror() << ".");
commio_finish_callback(fd, COMMIO_FD_WRITECB(fd), nleft ? COMM_ERROR : COMM_OK, errno);
}
} else {
/* A successful write, continue */
state->offset += len;
if (state->offset < state->size) {
/* Not done, reinstall the write handler and write some more */
commSetSelect(fd,
COMM_SELECT_WRITE,
commHandleWrite,
state,
0);
} else {
commio_finish_callback(fd, COMMIO_FD_WRITECB(fd), nleft ? COMM_OK : COMM_ERROR, errno);
}
}
PROF_stop(commHandleWrite);
}
/*
* Queue a write. handler/handler_data are called when the write
* completes, on error, or on file descriptor close.
*
* free_func is used to free the passed buffer when the write has completed.
*/
void
comm_write(int fd, const char *buf, int size, IOCB * handler, void *handler_data, FREE * free_func)
{
AsyncCall::Pointer call = commCbCall(5,5, "SomeCommWriteHander",
CommIoCbPtrFun(handler, handler_data));
comm_write(fd, buf, size, call, free_func);
}
void
comm_write(int fd, const char *buf, int size, AsyncCall::Pointer &callback, FREE * free_func)
{
debugs(5, 5, "comm_write: FD " << fd << ": sz " << size << ": asynCall " << callback);
/* Make sure we are open, not closing, and not writing */
assert(isOpen(fd));
assert(!fd_table[fd].closing());
comm_io_callback_t *ccb = COMMIO_FD_WRITECB(fd);
assert(!ccb->active());
/* Queue the write */
commio_set_callback(fd, IOCB_WRITE, ccb, callback,
(char *)buf, free_func, size);
commSetSelect(fd, COMM_SELECT_WRITE, commHandleWrite, ccb, 0);
}
/* a wrapper around comm_write to allow for MemBuf to be comm_written in a snap */
void
comm_write_mbuf(int fd, MemBuf *mb, IOCB * handler, void *handler_data)
{
comm_write(fd, mb->buf, mb->size, handler, handler_data, mb->freeFunc());
}
void
comm_write_mbuf(int fd, MemBuf *mb, AsyncCall::Pointer &callback)
{
comm_write(fd, mb->buf, mb->size, callback, mb->freeFunc());
}
/*
* hm, this might be too general-purpose for all the places we'd
* like to use it.
*/
int
ignoreErrno(int ierrno)
{
switch (ierrno) {
case EINPROGRESS:
case EWOULDBLOCK:
#if EAGAIN != EWOULDBLOCK
case EAGAIN:
#endif
case EALREADY:
case EINTR:
#ifdef ERESTART
case ERESTART:
#endif
return 1;
default:
return 0;
}
/* NOTREACHED */
}
void
commCloseAllSockets(void)
{
int fd;
fde *F = NULL;
for (fd = 0; fd <= Biggest_FD; fd++) {
F = &fd_table[fd];
if (!F->flags.open)
continue;
if (F->type != FD_SOCKET)
continue;
if (F->flags.ipc) /* don't close inter-process sockets */
continue;
if (F->timeoutHandler != NULL) {
AsyncCall::Pointer callback = F->timeoutHandler;
F->timeoutHandler = NULL;
debugs(5, 5, "commCloseAllSockets: FD " << fd << ": Calling timeout handler");
ScheduleCallHere(callback);
} else {
debugs(5, 5, "commCloseAllSockets: FD " << fd << ": calling comm_reset_close()");
comm_reset_close(fd);
}
}
}
static bool
AlreadyTimedOut(fde *F)
{
if (!F->flags.open)
return true;
if (F->timeout == 0)
return true;
if (F->timeout > squid_curtime)
return true;
return false;
}
void
checkTimeouts(void)
{
int fd;
fde *F = NULL;
AsyncCall::Pointer callback;
for (fd = 0; fd <= Biggest_FD; fd++) {
F = &fd_table[fd];
if (AlreadyTimedOut(F))
continue;
debugs(5, 5, "checkTimeouts: FD " << fd << " Expired");
if (F->timeoutHandler != NULL) {
debugs(5, 5, "checkTimeouts: FD " << fd << ": Call timeout handler");
callback = F->timeoutHandler;
F->timeoutHandler = NULL;
ScheduleCallHere(callback);
} else {
debugs(5, 5, "checkTimeouts: FD " << fd << ": Forcing comm_close()");
comm_close(fd);
}
}
}
/*
* New-style listen and accept routines
*
* Listen simply registers our interest in an FD for listening,
* and accept takes a callback to call when an FD has been
* accept()ed.
*/
int
comm_listen(int sock)
{
int x;
if ((x = listen(sock, Squid_MaxFD >> 2)) < 0) {
debugs(50, 0, "comm_listen: listen(" << (Squid_MaxFD >> 2) << ", " << sock << "): " << xstrerror());
return x;
}
if (Config.accept_filter && strcmp(Config.accept_filter, "none") != 0) {
#ifdef SO_ACCEPTFILTER
struct accept_filter_arg afa;
bzero(&afa, sizeof(afa));
debugs(5, DBG_CRITICAL, "Installing accept filter '" << Config.accept_filter << "' on FD " << sock);
xstrncpy(afa.af_name, Config.accept_filter, sizeof(afa.af_name));
x = setsockopt(sock, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa));
if (x < 0)
debugs(5, 0, "SO_ACCEPTFILTER '" << Config.accept_filter << "': '" << xstrerror());
#elif defined(TCP_DEFER_ACCEPT)
int seconds = 30;
if (strncmp(Config.accept_filter, "data=", 5) == 0)
seconds = atoi(Config.accept_filter + 5);
x = setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &seconds, sizeof(seconds));
if (x < 0)
debugs(5, 0, "TCP_DEFER_ACCEPT '" << Config.accept_filter << "': '" << xstrerror());
#else
debugs(5, 0, "accept_filter not supported on your OS");
#endif
}
return sock;
}
void
comm_accept(int fd, IOACB *handler, void *handler_data)
{
debugs(5, 5, "comm_accept: FD " << fd << " handler: " << (void*)handler);
assert(isOpen(fd));
AsyncCall::Pointer call = commCbCall(5,5, "SomeCommAcceptHandler",
CommAcceptCbPtrFun(handler, handler_data));
fdc_table[fd].subscribe(call);
}
void
comm_accept(int fd, AsyncCall::Pointer &call)
{
debugs(5, 5, "comm_accept: FD " << fd << " AsyncCall: " << call);
assert(isOpen(fd));
fdc_table[fd].subscribe(call);
}
// Called when somebody wants to be notified when our socket accepts new
// connection. We do not probe the FD until there is such interest.
void
AcceptFD::subscribe(AsyncCall::Pointer &call)
{
/* make sure we're not pending! */
assert(!theCallback);
theCallback = call;
#if OPTIMISTIC_IO
mayAcceptMore = true; // even if we failed to accept last time
#endif
if (mayAcceptMore)
acceptNext();
else
commSetSelect(fd, COMM_SELECT_READ, comm_accept_try, NULL, 0);
}
void
AcceptFD::acceptOne()
{
// If there is no callback and we accept, we will leak the accepted FD.
// When we are running out of FDs, there is often no callback.
if (!theCallback) {
debugs(5, 5, "AcceptFD::acceptOne orphaned: FD " << fd);
// XXX: can we remove this and similar "just in case" calls and
// either listen always or listen only when there is a callback?
if (!AcceptLimiter::Instance().deferring())
commSetSelect(fd, COMM_SELECT_READ, comm_accept_try, NULL, 0);
mayAcceptMore = false;
return;
}
/*
* We don't worry about running low on FDs here. Instead,
* httpAccept() will use AcceptLimiter if we reach the limit
* there.
*/
/* Accept a new connection */
ConnectionDetail connDetails;
int newfd = comm_old_accept(fd, connDetails);
/* Check for errors */
if (newfd < 0) {
assert(theCallback != NULL);
if (newfd == COMM_NOMESSAGE) {
/* register interest again */
debugs(5, 5, HERE << "try later: FD " << fd <<
" handler: " << theCallback);
commSetSelect(fd, COMM_SELECT_READ, comm_accept_try, NULL, 0);
return;
}
// A non-recoverable error; notify the caller */
notify(-1, COMM_ERROR, errno, connDetails);
mayAcceptMore = false;
return;
}
assert(theCallback != NULL);
debugs(5, 5, "AcceptFD::acceptOne accepted: FD " << fd <<
" newfd: " << newfd << " from: " << connDetails.peer <<
" handler: " << *theCallback);
notify(newfd, COMM_OK, 0, connDetails);
mayAcceptMore = true;
}
void
AcceptFD::acceptNext()
{
acceptOne();
}
void
AcceptFD::notify(int newfd, comm_err_t errcode, int xerrno, const ConnectionDetail &connDetails)
{
if (theCallback != NULL) {
typedef CommAcceptCbParams Params;
Params ¶ms = GetCommParams<Params>(theCallback);
params.fd = fd;
params.nfd = newfd;
params.details = connDetails;
params.flag = errcode;
params.xerrno = xerrno;
ScheduleCallHere(theCallback);
theCallback = NULL;
}
}
/*
* This callback is called whenever a filedescriptor is ready
* to dupe itself and fob off an accept()ed connection
*/
static void
comm_accept_try(int fd, void *)
{
assert(isOpen(fd));
fdc_table[fd].acceptNext();
}
void CommIO::Initialise()
{
/* Initialize done pipe signal */
int DonePipe[2];
if (pipe(DonePipe)) {}
DoneFD = DonePipe[1];
DoneReadFD = DonePipe[0];
fd_open(DoneReadFD, FD_PIPE, "async-io completetion event: main");
fd_open(DoneFD, FD_PIPE, "async-io completetion event: threads");
commSetNonBlocking(DoneReadFD);
commSetNonBlocking(DoneFD);
commSetSelect(DoneReadFD, COMM_SELECT_READ, NULLFDHandler, NULL, 0);
Initialised = true;
}
void CommIO::NotifyIOClose()
{
/* Close done pipe signal */
FlushPipe();
close(DoneFD);
close(DoneReadFD);
fd_close(DoneFD);
fd_close(DoneReadFD);
Initialised = false;
}
bool CommIO::Initialised = false;
bool CommIO::DoneSignalled = false;
int CommIO::DoneFD = -1;
int CommIO::DoneReadFD = -1;
void
CommIO::FlushPipe()
{
char buf[256];
FD_READ_METHOD(DoneReadFD, buf, sizeof(buf));
}
void
CommIO::NULLFDHandler(int fd, void *data)
{
FlushPipe();
commSetSelect(fd, COMM_SELECT_READ, NULLFDHandler, NULL, 0);
}
void
CommIO::ResetNotifications()
{
if (DoneSignalled) {
FlushPipe();
DoneSignalled = false;
}
}
AcceptLimiter AcceptLimiter::Instance_;
AcceptLimiter &AcceptLimiter::Instance()
{
return Instance_;
}
bool
AcceptLimiter::deferring() const
{
return deferred.size() > 0;
}
void
AcceptLimiter::defer (int fd, Acceptor::AcceptorFunction *aFunc, void *data)
{
debugs(5, 5, "AcceptLimiter::defer: FD " << fd << " handler: " << (void*)aFunc);
Acceptor temp;
temp.theFunction = aFunc;
temp.acceptFD = fd;
temp.theData = data;
deferred.push_back(temp);
}
void
AcceptLimiter::kick()
{
if (!deferring())
return;
/* Yes, this means the first on is the last off....
* If the list container was a little more friendly, we could sensibly us it.
*/
Acceptor temp = deferred.pop_back();
comm_accept (temp.acceptFD, temp.theFunction, temp.theData);
}
/// Start waiting for a possibly half-closed connection to close
// by scheduling a read callback to a monitoring handler that
// will close the connection on read errors.
void
commStartHalfClosedMonitor(int fd)
{
debugs(5, 5, HERE << "adding FD " << fd << " to " << *TheHalfClosed);
assert(isOpen(fd));
assert(!commHasHalfClosedMonitor(fd));
(void)TheHalfClosed->add(fd); // could also assert the result
commPlanHalfClosedCheck(); // may schedule check if we added the first FD
}
static
void
commPlanHalfClosedCheck()
{
if (!WillCheckHalfClosed && !TheHalfClosed->empty()) {
eventAdd("commHalfClosedCheck", &commHalfClosedCheck, NULL, 1.0, 1);
WillCheckHalfClosed = true;
}
}
/// iterates over all descriptors that may need half-closed tests and
/// calls comm_read for those that do; re-schedules the check if needed
static
void
commHalfClosedCheck(void *)
{
debugs(5, 5, HERE << "checking " << *TheHalfClosed);
typedef DescriptorSet::const_iterator DSCI;
const DSCI end = TheHalfClosed->end();
for (DSCI i = TheHalfClosed->begin(); i != end; ++i) {
const int fd = *i;
if (!fd_table[fd].halfClosedReader) { // not reading already
AsyncCall::Pointer call = commCbCall(5,4, "commHalfClosedReader",
CommIoCbPtrFun(&commHalfClosedReader, NULL));
comm_read(fd, NULL, 0, call);
fd_table[fd].halfClosedReader = call;
}
}
WillCheckHalfClosed = false; // as far as we know
commPlanHalfClosedCheck(); // may need to check again
}
/// checks whether we are waiting for possibly half-closed connection to close
// We are monitoring if the read handler for the fd is the monitoring handler.
bool
commHasHalfClosedMonitor(int fd)
{
return TheHalfClosed->has(fd);
}
/// stop waiting for possibly half-closed connection to close
static void
commStopHalfClosedMonitor(int const fd)
{
debugs(5, 5, HERE << "removing FD " << fd << " from " << *TheHalfClosed);
// cancel the read if one was scheduled
AsyncCall::Pointer reader = fd_table[fd].halfClosedReader;
if (reader != NULL)
comm_read_cancel(fd, reader);
fd_table[fd].halfClosedReader = NULL;
TheHalfClosed->del(fd);
}
/// I/O handler for the possibly half-closed connection monitoring code
static void
commHalfClosedReader(int fd, char *, size_t size, comm_err_t flag, int, void *)
{
// there cannot be more data coming in on half-closed connections
assert(size == 0);
assert(commHasHalfClosedMonitor(fd)); // or we would have canceled the read
fd_table[fd].halfClosedReader = NULL; // done reading, for now
// nothing to do if fd is being closed
if (flag == COMM_ERR_CLOSING)
return;
// if read failed, close the connection
if (flag != COMM_OK) {
debugs(5, 3, "commHalfClosedReader: closing FD " << fd);
comm_close(fd);
return;
}
// continue waiting for close or error
commPlanHalfClosedCheck(); // make sure this fd will be checked again
}
CommRead::CommRead() : fd(-1), buf(NULL), len(0), callback(NULL) {}
CommRead::CommRead(int fd_, char *buf_, int len_, AsyncCall::Pointer &callback_)
: fd(fd_), buf(buf_), len(len_), callback(callback_) {}
DeferredRead::DeferredRead () : theReader(NULL), theContext(NULL), theRead(), cancelled(false) {}
DeferredRead::DeferredRead (DeferrableRead *aReader, void *data, CommRead const &aRead) : theReader(aReader), theContext (data), theRead(aRead), cancelled(false) {}
DeferredReadManager::~DeferredReadManager()
{
flushReads();
assert (deferredReads.empty());
}
/* explicit instantiation required for some systems */
/// \cond AUTODOCS-IGNORE
template cbdata_type CbDataList<DeferredRead>::CBDATA_CbDataList;
/// \endcond
void
DeferredReadManager::delayRead(DeferredRead const &aRead)
{
debugs(5, 3, "Adding deferred read on FD " << aRead.theRead.fd);
CbDataList<DeferredRead> *temp = deferredReads.push_back(aRead);
// We have to use a global function as a closer and point to temp
// instead of "this" because DeferredReadManager is not a job and
// is not even cbdata protected
AsyncCall::Pointer closer = commCbCall(5,4,
"DeferredReadManager::CloseHandler",
CommCloseCbPtrFun(&CloseHandler, temp));
comm_add_close_handler(aRead.theRead.fd, closer);
temp->element.closer = closer; // remeber so that we can cancel
}
void
DeferredReadManager::CloseHandler(int fd, void *thecbdata)
{
if (!cbdataReferenceValid (thecbdata))
return;
CbDataList<DeferredRead> *temp = (CbDataList<DeferredRead> *)thecbdata;
temp->element.closer = NULL;
temp->element.markCancelled();
}
DeferredRead
DeferredReadManager::popHead(CbDataListContainer<DeferredRead> &deferredReads)
{
assert (!deferredReads.empty());
DeferredRead &read = deferredReads.head->element;
if (!read.cancelled) {
comm_remove_close_handler(read.theRead.fd, read.closer);
read.closer = NULL;
}
DeferredRead result = deferredReads.pop_front();
return result;
}
void
DeferredReadManager::kickReads(int const count)
{
/* if we had CbDataList::size() we could consolidate this and flushReads */
if (count < 1) {
flushReads();
return;
}
size_t remaining = count;
while (!deferredReads.empty() && remaining) {
DeferredRead aRead = popHead(deferredReads);
kickARead(aRead);
if (!aRead.cancelled)
--remaining;
}
}
void
DeferredReadManager::flushReads()
{
CbDataListContainer<DeferredRead> reads;
reads = deferredReads;
deferredReads = CbDataListContainer<DeferredRead>();
// XXX: For fairness this SHOULD randomize the order
while (!reads.empty()) {
DeferredRead aRead = popHead(reads);
kickARead(aRead);
}
}
void
DeferredReadManager::kickARead(DeferredRead const &aRead)
{
if (aRead.cancelled)
return;
if (aRead.theRead.fd>=0 && fd_table[aRead.theRead.fd].closing())
return;
debugs(5, 3, "Kicking deferred read on FD " << aRead.theRead.fd);
aRead.theReader(aRead.theContext, aRead.theRead);
}
void
DeferredRead::markCancelled()
{
cancelled = true;
}
ConnectionDetail::ConnectionDetail() : me(), peer()
{
}
int
CommSelectEngine::checkEvents(int timeout)
{
static time_t last_timeout = 0;
/* No, this shouldn't be here. But it shouldn't be in each comm handler. -adrian */
if (squid_curtime > last_timeout) {
last_timeout = squid_curtime;
checkTimeouts();
}
switch (comm_select(timeout)) {
case COMM_OK:
case COMM_TIMEOUT:
return 0;
case COMM_IDLE:
case COMM_SHUTDOWN:
return EVENT_IDLE;
case COMM_ERROR:
return EVENT_ERROR;
default:
fatal_dump("comm.cc: Internal error -- this should never happen.");
return EVENT_ERROR;
};
}
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