socket.c

bind 9.3结合mysql数据库

		return (-1);
	else
		return (total_bytes);
} 

static void
manager_log(isc_socketmgr_t *sockmgr, isc_logcategory_t *category,
	    isc_logmodule_t *module, int level, const char *fmt, ...)
{
	char msgbuf[2048];
	va_list ap;

	if (!isc_log_wouldlog(isc_lctx, level))
		return;

	va_start(ap, fmt);
	vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
	va_end(ap);

	isc_log_write(isc_lctx, category, module, level,
		      "sockmgr %p: %s", sockmgr, msgbuf);
}

static void
socket_log(isc_socket_t *sock, isc_sockaddr_t *address,
	   isc_logcategory_t *category, isc_logmodule_t *module, int level,
	   isc_msgcat_t *msgcat, int msgset, int message,
	   const char *fmt, ...) ISC_FORMAT_PRINTF(9, 10);

static void
socket_log(isc_socket_t *sock, isc_sockaddr_t *address,
	   isc_logcategory_t *category, isc_logmodule_t *module, int level,
	   isc_msgcat_t *msgcat, int msgset, int message,
	   const char *fmt, ...)
{
	char msgbuf[2048];
	char peerbuf[256];
	va_list ap;

	if (! isc_log_wouldlog(isc_lctx, level))
		return;

	va_start(ap, fmt);
	vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
	va_end(ap);

	if (address == NULL) {
		isc_log_iwrite(isc_lctx, category, module, level,
			       msgcat, msgset, message,
			       "socket %p: %s", sock, msgbuf);
	} else {
		isc_sockaddr_format(address, peerbuf, sizeof(peerbuf));
		isc_log_iwrite(isc_lctx, category, module, level,
			       msgcat, msgset, message,
			       "socket %p %s: %s", sock, peerbuf, msgbuf);
	}
}

/*
 * Make an fd SOCKET non-blocking.
 */
static isc_result_t
make_nonblock(SOCKET fd) {
	int ret;
	unsigned long flags = 1;
	char strbuf[ISC_STRERRORSIZE];

	/* Set the socket to non-blocking */
	ret = ioctlsocket(fd, FIONBIO, &flags);

	if (ret == -1) {
		isc__strerror(errno, strbuf, sizeof(strbuf));
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "ioctlsocket(%d, FIOBIO, %d): %s",
				 fd, flags, strbuf);

		return (ISC_R_UNEXPECTED);
	}

	return (ISC_R_SUCCESS);
}

/*
 * Windows 2000 systems incorrectly cause UDP sockets using WASRecvFrom
 * to not work correctly, returning a WSACONNRESET error when a WSASendTo
 * fails with an "ICMP port unreachable" response and preventing the
 * socket from using the WSARecvFrom in subsequent operations.
 * The function below fixes this, but requires that Windows 2000
 * Service Pack 2 or later be installed on the system.  NT 4.0
 * systems are not affected by this and work correctly.
 * See Microsoft Knowledge Base Article Q263823 for details of this.
 */
isc_result_t
connection_reset_fix(SOCKET fd) {
	DWORD dwBytesReturned = 0;
	BOOL  bNewBehavior = FALSE;
	DWORD status;

	if(isc_win32os_majorversion() < 5)
		return (ISC_R_SUCCESS); /*  NT 4.0 has no problem */

	/* disable bad behavior using IOCTL: SIO_UDP_CONNRESET */
	status = WSAIoctl(fd, SIO_UDP_CONNRESET, &bNewBehavior,
			  sizeof(bNewBehavior), NULL, 0,
			  &dwBytesReturned, NULL, NULL);
	if (status != SOCKET_ERROR)
		return (ISC_R_SUCCESS);
	else {
		UNEXPECTED_ERROR(__FILE__, __LINE__,
				 "WSAIoctl(SIO_UDP_CONNRESET, oldBehaviour) %s",
				 isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
						ISC_MSG_FAILED, "failed"));
		return (ISC_R_UNEXPECTED);
	}
}

/*
 * Construct an iov array and attach it to the msghdr passed in.  This is
 * the SEND constructor, which will use the used region of the buffer
 * (if using a buffer list) or will use the internal region (if a single
 * buffer I/O is requested).
 *
 * Nothing can be NULL, and the done event must list at least one buffer
 * on the buffer linked list for this function to be meaningful.
 *
 * If write_countp != NULL, *write_countp will hold the number of bytes
 * this transaction can send.
 */
static void
build_msghdr_send(isc_socket_t *sock, isc_socketevent_t *dev,
		  struct msghdr *msg, char *cmsg,
		  WSABUF *iov, size_t *write_countp)
{
	unsigned int iovcount;
	isc_buffer_t *buffer;
	isc_region_t used;
	size_t write_count;
	size_t skip_count;

	memset(msg, 0, sizeof(*msg));

	if (sock->type == isc_sockettype_udp) {
		msg->msg_name = (void *)&dev->address.type.sa;
		msg->msg_namelen = dev->address.length;
	} else {
		msg->msg_name = NULL;
		msg->msg_namelen = 0;
	}

	buffer = ISC_LIST_HEAD(dev->bufferlist);
	write_count = 0;
	iovcount = 0;

	/*
	 * Single buffer I/O?  Skip what we've done so far in this region.
	 */
	if (buffer == NULL) {
		write_count = dev->region.length - dev->n;
		iov[0].buf = (void *)(dev->region.base + dev->n);
		iov[0].len = write_count;
		iovcount = 1;

		goto config;
	}

	/*
	 * Multibuffer I/O.
	 * Skip the data in the buffer list that we have already written.
	 */
	skip_count = dev->n;
	while (buffer != NULL) {
		REQUIRE(ISC_BUFFER_VALID(buffer));
		if (skip_count < isc_buffer_usedlength(buffer))
			break;
		skip_count -= isc_buffer_usedlength(buffer);
		buffer = ISC_LIST_NEXT(buffer, link);
	}

	while (buffer != NULL) {
		INSIST(iovcount < MAXSCATTERGATHER_SEND);

		isc_buffer_usedregion(buffer, &used);

		if (used.length > 0) {
			iov[iovcount].buf = (void *)(used.base
							  + skip_count);
			iov[iovcount].len = used.length - skip_count;
			write_count += (used.length - skip_count);
			skip_count = 0;
			iovcount++;
		}
		buffer = ISC_LIST_NEXT(buffer, link);
	}

	INSIST(skip_count == 0);

 config:
	msg->msg_iov = iov;
	msg->msg_iovlen = iovcount;

	if (write_countp != NULL)
		*write_countp = write_count;
}

/*
 * Construct an iov array and attach it to the msghdr passed in.  This is
 * the RECV constructor, which will use the available region of the buffer
 * (if using a buffer list) or will use the internal region (if a single
 * buffer I/O is requested).
 *
 * Nothing can be NULL, and the done event must list at least one buffer
 * on the buffer linked list for this function to be meaningful.
 *
 * If read_countp != NULL, *read_countp will hold the number of bytes
 * this transaction can receive.
 */
static void
build_msghdr_recv(isc_socket_t *sock, isc_socketevent_t *dev,
		  struct msghdr *msg, char *cmsg,
		  WSABUF *iov, size_t *read_countp)
{
	unsigned int iovcount;
	isc_buffer_t *buffer;
	isc_region_t available;
	size_t read_count;

	memset(msg, 0, sizeof(struct msghdr));

	if (sock->type == isc_sockettype_udp) {
		memset(&dev->address, 0, sizeof(dev->address));
		msg->msg_name = (void *)&dev->address.type.sa;
		msg->msg_namelen = sizeof(dev->address.type);
	} else { /* TCP */
		msg->msg_name = NULL;
		msg->msg_namelen = 0;
		dev->address = sock->address;
	}

	buffer = ISC_LIST_HEAD(dev->bufferlist);
	read_count = 0;

	/*
	 * Single buffer I/O?  Skip what we've done so far in this region.
	 */
	if (buffer == NULL) {
		read_count = dev->region.length - dev->n;
		iov[0].buf = (void *)(dev->region.base + dev->n);
		iov[0].len = read_count;
		iovcount = 1;
	} else {
		/*
		 * Multibuffer I/O.
		 * Skip empty buffers.
		 */
		while (buffer != NULL) {
			REQUIRE(ISC_BUFFER_VALID(buffer));
			if (isc_buffer_availablelength(buffer) != 0)
				break;
			buffer = ISC_LIST_NEXT(buffer, link);
		}

		iovcount = 0;
		while (buffer != NULL) {
			INSIST(iovcount < MAXSCATTERGATHER_RECV);

			isc_buffer_availableregion(buffer, &available);

			if (available.length > 0) {
				iov[iovcount].buf = (void *)(available.base);
				iov[iovcount].len = available.length;
				read_count += available.length;
				iovcount++;
			}
			buffer = ISC_LIST_NEXT(buffer, link);
		}
	}

	/*
	 * If needed, set up to receive that one extra byte.  Note that
	 * we know there is at least one iov left, since we stole it
	 * at the top of this function.
	 */

	msg->msg_iov = iov;
	msg->msg_iovlen = iovcount;

	if (read_countp != NULL)
		*read_countp = read_count;
}

static void
set_dev_address(isc_sockaddr_t *address, isc_socket_t *sock,
		isc_socketevent_t *dev)
{
	if (sock->type == isc_sockettype_udp) {
		if (address != NULL)
			dev->address = *address;
		else
			dev->address = sock->address;
	} else if (sock->type == isc_sockettype_tcp) {
		INSIST(address == NULL);
		dev->address = sock->address;
	}
}

static isc_socketevent_t *
allocate_socketevent(isc_socket_t *sock, isc_eventtype_t eventtype,
		     isc_taskaction_t action, const void *arg)
{
	isc_socketevent_t *ev;

	ev = (isc_socketevent_t *)isc_event_allocate(sock->manager->mctx,
						     sock, eventtype,
						     action, arg,
						     sizeof(*ev));
	if (ev == NULL)
		return (NULL);

	ev->result = ISC_R_UNEXPECTED;
	ISC_LINK_INIT(ev, ev_link);
	ISC_LIST_INIT(ev->bufferlist);
	ev->region.base = NULL;
	ev->n = 0;
	ev->offset = 0;
	ev->attributes = 0;

	return (ev);
}

#if defined(ISC_SOCKET_DEBUG)
static void
dump_msg(struct msghdr *msg, isc_socket_t *sock) {
	unsigned int i;

	printf("MSGHDR %p, Socket #: %u\n", msg, sock->fd);
	printf("\tname %p, namelen %d\n", msg->msg_name, msg->msg_namelen);
	printf("\tiov %p, iovlen %d\n", msg->msg_iov, msg->msg_iovlen);
	for (i = 0; i < (unsigned int)msg->msg_iovlen; i++)
		printf("\t\t%d\tbase %p, len %d\n", i,
		       msg->msg_iov[i].buf,
		       msg->msg_iov[i].len);
}
#endif

#define DOIO_SUCCESS		0	/* i/o ok, event sent */
#define DOIO_SOFT		1	/* i/o ok, soft error, no event sent */
#define DOIO_HARD		2	/* i/o error, event sent */
#define DOIO_EOF		3	/* EOF, no event sent */

static int
completeio_recv(isc_socket_t *sock, isc_socketevent_t *dev,
		struct msghdr *messagehdr, int cc, int recv_errno)
{
	size_t actual_count;
	isc_buffer_t *buffer;

#define SOFT_OR_HARD(_system, _isc) \
	if (recv_errno == _system) { \
		if (sock->connected) { \
			dev->result = _isc; \
			return (DOIO_HARD); \
		} \
		return (DOIO_SOFT); \
	}

#define ALWAYS_HARD(_system, _isc) \
	if (recv_errno == _system) { \
		dev->result = _isc; \
		return (DOIO_HARD); \
	}

	if (recv_errno != 0) {

		if (SOFT_ERROR(recv_errno))
			return (DOIO_SOFT);

		SOFT_OR_HARD(WSAECONNREFUSED, ISC_R_CONNREFUSED);
		SOFT_OR_HARD(WSAENETUNREACH, ISC_R_NETUNREACH);
		SOFT_OR_HARD(WSAEHOSTUNREACH, ISC_R_HOSTUNREACH);
		SOFT_OR_HARD(WSAECONNRESET, ISC_R_CONNECTIONRESET);
		SOFT_OR_HARD(WSAENETRESET, ISC_R_CONNECTIONRESET);
		SOFT_OR_HARD(WSAECONNABORTED, ISC_R_CONNECTIONRESET);
		SOFT_OR_HARD(WSAEDISCON, ISC_R_CONNECTIONRESET);
		SOFT_OR_HARD(WSAENETDOWN, ISC_R_NETDOWN);
		ALWAYS_HARD(ERROR_OPERATION_ABORTED, ISC_R_CONNECTIONRESET);
		ALWAYS_HARD(ERROR_PORT_UNREACHABLE, ISC_R_HOSTUNREACH);
		ALWAYS_HARD(ERROR_HOST_UNREACHABLE, ISC_R_HOSTUNREACH);
		ALWAYS_HARD(ERROR_NETWORK_UNREACHABLE, ISC_R_NETUNREACH);
		ALWAYS_HARD(WSAENOBUFS, ISC_R_NORESOURCES);

#undef SOFT_OR_HARD
#undef ALWAYS_HARD

		dev->result = isc__errno2result(recv_errno);
		return (DOIO_HARD);
	}

	/*
	 * On TCP, zero length reads indicate EOF, while on
	 * UDP, zero length reads are perfectly valid, although
	 * strange.
	 */
	if ((sock->type == isc_sockettype_tcp) && (cc == 0))
		return (DOIO_EOF);

	if (sock->type == isc_sockettype_udp) {
		dev->address.length = messagehdr->msg_namelen;
		if (isc_sockaddr_getport(&dev->address) == 0) {
			if (isc_log_wouldlog(isc_lctx, IOEVENT_LEVEL)) {
				socket_log(sock, &dev->address, IOEVENT,
					   isc_msgcat, ISC_MSGSET_SOCKET,
					   ISC_MSG_ZEROPORT, 
					   "dropping source port zero packet");
			}
			return (DOIO_SOFT);
		}
	}

	socket_log(sock, &dev->address, IOEVENT,
		   isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_PKTRECV,
		   "packet received correctly");

	/*
	 * Overflow bit detection.  If we received MORE bytes than we should,
	 * this indicates an overflow situation.  Set the flag in the
	 * dev entry and adjust how much we read by one.
	 */
#ifdef ISC_NET_RECVOVERFLOW
	if ((sock->type == isc_sockettype_udp) && ((size_t)cc > read_count)) {
		dev->attributes |= ISC_SOCKEVENTATTR_TRUNC;
		cc--;
	}
#endif

	/*
	 * update the buffers (if any) and the i/o count
	 */
	dev->n += cc;
	actual_count = cc;
	buffer = ISC_LIST_HEAD(dev->bufferlist);
	while (buffer != NULL && actual_count > 0) {
		REQUIRE(ISC_BUFFER_VALID(buffer));
		if (isc_buffer_availablelength(buffer) <= actual_count) {
			actual_count -= isc_buffer_availablelength(buffer);
			isc_buffer_add(buffer,
				       isc_buffer_availablelength(buffer));
		} else {
			isc_buffer_add(buffer, actual_count);
			actual_count = 0;
			break;
		}
		buffer = ISC_LIST_NEXT(buffer, link);
		if (buffer == NULL) {
			INSIST(actual_count == 0);
		}
	}

	/*
	 * If we read less than we expected, update counters,
	 * and let the upper layer handle it.
	 */
	if (((size_t)cc != sock->totalBytes) && (dev->n < dev->minimum))
		return (DOIO_SOFT);

	/*
	 * Full reads are posted, or partials if partials are ok.
	 */
	dev->result = ISC_R_SUCCESS;
	return (DOIO_SUCCESS);
}

static int
startio_recv(isc_socket_t *sock, isc_socketevent_t *dev, int *nbytes,
	     int *recv_errno)
{
	char *cmsg = NULL;
	char strbuf[ISC_STRERRORSIZE];
	IoCompletionInfo *lpo;
	int status;
	struct msghdr *msghdr;

	lpo = (IoCompletionInfo *) HeapAlloc(hHeapHandle,
					     HEAP_ZERO_MEMORY,
					     sizeof(IoCompletionInfo));
	lpo->request_type = SOCKET_RECV;
	lpo->dev = dev;
	msghdr = &lpo->messagehdr;
	memset(msghdr, 0, sizeof(struct msghdr));

	build_msghdr_recv(sock, dev, msghdr, cmsg, sock->iov,
			  &(sock->totalBytes));

#if defined(ISC_SOCKET_DEBUG)
	dump_msg(msghdr, sock);
#endif

	*nbytes = internal_recvmsg(sock, lpo, msghdr, 0, recv_errno);

	if (*nbytes < 0) {
		if (SOFT_ERROR(*recv_errno)) {
			status = DOIO_SOFT;