[deb_libnfs.git] / lib / socket.c

/*
   Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef WIN32
#include "win32_compat.h"
#else
#include <unistd.h>
#include <poll.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netdb.h>
#endif/*WIN32*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
#include <sys/types.h>
#include "libnfs.h"
#include "libnfs-raw.h"
#include "libnfs-private.h"
#include "slist.h"

#ifdef WIN32
//has to be included after stdlib!!
#include "win32_errnowrapper.h"
#endif


static int rpc_reconnect_requeue(struct rpc_context *rpc);
static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);

static void set_nonblocking(int fd)
{
	int v = 0;
#if defined(WIN32)
	long nonblocking=1;
	v = ioctlsocket(fd, FIONBIO,&nonblocking);
#else
	v = fcntl(fd, F_GETFL, 0);
        fcntl(fd, F_SETFL, v | O_NONBLOCK);
#endif //FIXME
}

int rpc_get_fd(struct rpc_context *rpc)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	return rpc->fd;
}

int rpc_which_events(struct rpc_context *rpc)
{
	int events;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	events = rpc->is_connected ? POLLIN : POLLOUT;

	if (rpc->is_udp != 0) {
		/* for udp sockets we only wait for pollin */
		return POLLIN;
	}

	if (rpc->outqueue) {
		events |= POLLOUT;
	}
	return events;
}

static int rpc_write_to_socket(struct rpc_context *rpc)
{
	int64_t count;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (rpc->fd == -1) {
		rpc_set_error(rpc, "trying to write but not connected");
		return -1;
	}

	while (rpc->outqueue != NULL) {
		int64_t total;

		total = rpc->outqueue->outdata.size;

#if defined(WIN32)
		count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
#else
		count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
#endif
		if (count == -1) {
			if (errno == EAGAIN || errno == EWOULDBLOCK) {
				return 0;
			}
			rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
			return -1;
		}

		rpc->outqueue->written += count;
		if (rpc->outqueue->written == total) {
			struct rpc_pdu *pdu = rpc->outqueue;

	       	    	SLIST_REMOVE(&rpc->outqueue, pdu);
			SLIST_ADD_END(&rpc->waitpdu, pdu);
		}
	}
	return 0;
}

static int rpc_read_from_socket(struct rpc_context *rpc)
{
	int available;
	int size;
	int pdu_size;
	int64_t count;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

#if defined(WIN32)
	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
#else
	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
#endif
		rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
		return -1;
	}

	if (available == 0) {
		rpc_set_error(rpc, "Socket has been closed");
		return -1;
	}

	if (rpc->is_udp) {
		char *buf;
		socklen_t socklen = sizeof(rpc->udp_src);

		buf = malloc(available);
		if (buf == NULL) {
			rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
			return -1;
		}
		count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
		if (count < 0) {
			rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
			free(buf);
		}
		if (rpc_process_pdu(rpc, buf, count) != 0) {
			rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
			free(buf);
			return -1;
		}
		free(buf);
		return 0;
	}

	/* read record marker, 4 bytes at the beginning of every pdu */
	if (rpc->inbuf == NULL) {
		rpc->insize = 4;
		rpc->inbuf = malloc(rpc->insize);
		if (rpc->inbuf == NULL) {
			rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
			return -1;
		}
	}
	if (rpc->inpos < 4) {
		size = 4 - rpc->inpos;

#if defined(WIN32)
		count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
#else
		count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
#endif
		if (count == -1) {
			if (errno == EINTR) {
				return 0;
			}
			rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
			return -1;
		}
		available  -= count;
		rpc->inpos += count;
	}

	if (available == 0) {
		return 0;
	}

	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	if (rpc->insize < pdu_size) {
		unsigned char *buf;
		
		buf = malloc(pdu_size);
		if (buf == NULL) {
			rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
			return -1;
		}
		memcpy(buf, rpc->inbuf, rpc->insize);
		free(rpc->inbuf);
		rpc->inbuf  = buf;
		rpc->insize = rpc_get_pdu_size(rpc->inbuf);
	}

	size = available;
	if (size > rpc->insize - rpc->inpos) {
		size = rpc->insize - rpc->inpos;
	}

#if defined(WIN32)
	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
#else
	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
#endif
	if (count == -1) {
		if (errno == EINTR) {
			return 0;
		}
		rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
		return -1;
	}
	available  -= count;
	rpc->inpos += count;

	if (rpc->inpos == rpc->insize) {
		if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
			rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
			return -1;
		}
		free(rpc->inbuf);
		rpc->inbuf  = NULL;
		rpc->insize = 0;
		rpc->inpos  = 0;
	}

	return 0;
}


int rpc_service(struct rpc_context *rpc, int revents)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (revents & POLLERR) {
#ifdef WIN32
		char err = 0;
#else
		int err = 0;
#endif
		socklen_t err_size = sizeof(err);

		if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
				(char *)&err, &err_size) != 0 || err != 0) {
			if (err == 0) {
				err = errno;
			}
			rpc_set_error(rpc, "rpc_service: socket error "
					       "%s(%d).",
					       strerror(err), err);
		} else {
			rpc_set_error(rpc, "rpc_service: POLLERR, "
						"Unknown socket error.");
		}
		if (rpc->connect_cb != NULL) {
			rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
		}
		return -1;
	}
	if (revents & POLLHUP) {
		rpc_set_error(rpc, "Socket failed with POLLHUP");
		if (rpc->connect_cb != NULL) {
			rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
		}
		return -1;
	}

	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
		int err = 0;
		socklen_t err_size = sizeof(err);

		if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
				(char *)&err, &err_size) != 0 || err != 0) {
			if (err == 0) {
				err = errno;
			}
			rpc_set_error(rpc, "rpc_service: socket error "
				  	"%s(%d) while connecting.",
					strerror(err), err);
			if (rpc->connect_cb != NULL) {
				rpc->connect_cb(rpc, RPC_STATUS_ERROR,
					NULL, rpc->connect_data);
			}
			return -1;
		}

		rpc->is_connected = 1;
		if (rpc->connect_cb != NULL) {
			rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
		}
		return 0;
	}

	if (revents & POLLIN) {
		if (rpc_read_from_socket(rpc) != 0) {
		  	rpc_reconnect_requeue(rpc);
			return 0;
		}
	}

	if (revents & POLLOUT && rpc->outqueue != NULL) {
		if (rpc_write_to_socket(rpc) != 0) {
			rpc_set_error(rpc, "write to socket failed");
			return -1;
		}
	}

	return 0;
}

void rpc_set_autoreconnect(struct rpc_context *rpc)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	rpc->auto_reconnect = 1;
}

void rpc_unset_autoreconnect(struct rpc_context *rpc)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	rpc->auto_reconnect = 0;
}

static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
{
	int socksize;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	switch (s->ss_family) {
	case AF_INET:
		socksize = sizeof(struct sockaddr_in);
		rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		break;
	default:
		rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
		return -1;
	}

	if (rpc->fd == -1) {
		rpc_set_error(rpc, "Failed to open socket");
		return -1;
	}

	/* Some systems allow you to set capabilities on an executable
	 * to allow the file to be executed with privilege to bind to
	 * privileged system ports, even if the user is not root.
	 *
	 * Opportunistically try to bind the socket to a low numbered
	 * system port in the hope that the user is either root or the
	 * executable has the CAP_NET_BIND_SERVICE.
	 *
	 * As soon as we fail the bind() with EACCES we know we will never
	 * be able to bind to a system port so we terminate the loop.
	 *
	 * On linux, use
	 *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
	 * to make the executable able to bind to a system port.
	 *
	 * On Windows, there is no concept of privileged ports. Thus
	 * binding will usually succeed.
	 */
	{
		struct sockaddr_in sin;
		static int portOfs = 0;
		const int firstPort = 512;	/* >= 512 according to Sun docs */
		const int portCount = IPPORT_RESERVED - firstPort;
		int startOfs = portOfs, port, rc;

		do {
			rc = -1;
			port = htons(firstPort + portOfs);
			portOfs = (portOfs + 1) % portCount;

			/* skip well-known ports */
			if (!getservbyport(port, "tcp")) {
				memset(&sin, 0, sizeof(sin));
				sin.sin_port        = port;
				sin.sin_family      = AF_INET;
				sin.sin_addr.s_addr = 0;

				rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
#if !defined(WIN32)
				/* we got EACCES, so don't try again */
				if (rc != 0 && errno == EACCES)
					break;
#endif
			}
		} while (rc != 0 && portOfs != startOfs);
	}

	set_nonblocking(rpc->fd);

	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
		rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
		return -1;
	}		

	return 0;
}	    

int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
{
	struct sockaddr_in *sin = (struct sockaddr_in *)&rpc->s;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (rpc->fd != -1) {
		rpc_set_error(rpc, "Trying to connect while already connected");
		return -1;
	}

	if (rpc->is_udp != 0) {
		rpc_set_error(rpc, "Trying to connect on UDP socket");
		return -1;
	}

	rpc->auto_reconnect = 0;

	sin->sin_family = AF_INET;
	sin->sin_port   = htons(port);
	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
		rpc_set_error(rpc, "Not a valid server ip address");
		return -1;
	}


	switch (rpc->s.ss_family) {
	case AF_INET:
#ifdef HAVE_SOCKADDR_LEN
		sin->sin_len = sizeof(struct sockaddr_in);
#endif
		break;
	}

	rpc->connect_cb  = cb;
	rpc->connect_data = private_data;

	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
		return -1;
	}

	return 0;
}	    

int rpc_disconnect(struct rpc_context *rpc, char *error)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	rpc_unset_autoreconnect(rpc);

	if (rpc->fd != -1) {
#if defined(WIN32)
		closesocket(rpc->fd);
#else
		close(rpc->fd);
#endif
	}
	rpc->fd  = -1;

	rpc->is_connected = 0;

	rpc_error_all_pdus(rpc, error);

	return 0;
}

static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (status != RPC_STATUS_SUCCESS) {
		rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
		return;
	}

	rpc->is_connected = 1;
	rpc->connect_cb   = NULL;
}

/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
static int rpc_reconnect_requeue(struct rpc_context *rpc)
{
	struct rpc_pdu *pdu;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (rpc->fd != -1) {
#if defined(WIN32)
		closesocket(rpc->fd);
#else
		close(rpc->fd);
#endif
	}
	rpc->fd  = -1;

	rpc->is_connected = 0;

	/* socket is closed so we will not get any replies to any commands
	 * in flight. Move them all over from the waitpdu queue back to the out queue
	 */
	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
		SLIST_REMOVE(&rpc->waitpdu, pdu);
		SLIST_ADD(&rpc->outqueue, pdu);
		/* we have to re-send the whole pdu again */
		pdu->written = 0;
	}

	if (rpc->auto_reconnect != 0) {
		rpc->connect_cb  = reconnect_cb;

		if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
			rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
			return -1;
		}
	}

	return 0;
}


int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
{
	struct addrinfo *ai = NULL;
	char service[6];

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (rpc->is_udp == 0) {
		rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
		return -1;
	}

	sprintf(service, "%d", port);
	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
		rpc_set_error(rpc, "Invalid address:%s. "
			"Can not resolv into IPv4/v6 structure.");
		return -1;
 	}

	switch(ai->ai_family) {
	case AF_INET:
		rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
		if (rpc->fd == -1) {
			rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno)); 
			freeaddrinfo(ai);
			return -1;
		}

		if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
			rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno)); 
			freeaddrinfo(ai);
			return -1;
		}
		break;
	default:
		rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
		freeaddrinfo(ai);
		return -1;
	}

	freeaddrinfo(ai);

	return 0;
}

int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
{
	struct addrinfo *ai = NULL;
	char service[6];

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (rpc->is_udp == 0) {
		rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
		return -1;
	}

	sprintf(service, "%d", port);
	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
		rpc_set_error(rpc, "Invalid address:%s. "
			"Can not resolv into IPv4/v6 structure.");
		return -1;
 	}

	if (rpc->udp_dest) {
		free(rpc->udp_dest);
		rpc->udp_dest = NULL;
	}
	rpc->udp_dest = malloc(ai->ai_addrlen);
	if (rpc->udp_dest == NULL) {
		rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
		freeaddrinfo(ai);
		return -1;
	}
	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	freeaddrinfo(ai);

	rpc->is_broadcast = is_broadcast;
	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));

	return 0;
}

struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	return (struct sockaddr *)&rpc->udp_src;
}

int rpc_queue_length(struct rpc_context *rpc)
{
	int i=0;
	struct rpc_pdu *pdu;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
		i++;
	}
	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
		i++;
	}
	return i;
}
Commit	Line	Data
84004dbf RS	1	/*
	2	Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU Lesser General Public License as published by
	6	the Free Software Foundation; either version 2.1 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public License
	15	along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
a8a1b858 M	17	#ifdef WIN32
	18	#include "win32_compat.h"
	19	#else
	20	#include <unistd.h>
	21	#include <poll.h>
	22	#include <arpa/inet.h>
	23	#include <sys/ioctl.h>
	24	#include <sys/socket.h>
	25	#include <netdb.h>
	26	#endif/WIN32/
84004dbf	27
fc01d2a9 TN	28	#ifdef HAVE_CONFIG_H
	29	#include "config.h"
	30	#endif
84004dbf	31	#include <stdio.h>
98f5fee8	32	#include <stdlib.h>
4a2b0876	33	#include <assert.h>
84004dbf	34	#include <fcntl.h>
84004dbf RS	35	#include <string.h>
84004dbf RS	36	#include <errno.h>
98f5fee8	37	#include <rpc/rpc.h>
84004dbf	38	#include <rpc/xdr.h>
fc01d2a9 TN	39	#ifdef HAVE_SYS_FILIO_H
	40	#include <sys/filio.h>
	41	#endif
647d2ea1 RS	42	#ifdef HAVE_SYS_SOCKIO_H
	43	#include <sys/sockio.h>
	44	#endif
485bc9b9	45	#include <sys/types.h>
84004dbf RS	46	#include "libnfs.h"
	47	#include "libnfs-raw.h"
	48	#include "libnfs-private.h"
	49	#include "slist.h"
	50
fcc42bfe M	51	#ifdef WIN32
	52	//has to be included after stdlib!!
	53	#include "win32_errnowrapper.h"
	54	#endif
	55
	56
1744ef90 RS	57	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	58	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	59
84004dbf RS	60	static void set_nonblocking(int fd)
84004dbf RS	61	{
99c14c9b	62	int v = 0;
6874f61e	63	#if defined(WIN32)
99c14c9b	64	long nonblocking=1;
99c14c9b	65	v = ioctlsocket(fd, FIONBIO,&nonblocking);
6874f61e	66	#else
84004dbf RS	67	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	68	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	69	#endif //FIXME
84004dbf RS	70	}
	71
	72	int rpc_get_fd(struct rpc_context *rpc)
	73	{
4a2b0876 RS	74	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	75
84004dbf RS	76	return rpc->fd;
	77	}
	78
	79	int rpc_which_events(struct rpc_context *rpc)
	80	{
4a2b0876 RS	81	int events;
	82
	83	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	84
	85	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	86
5911f3e8 RS	87	if (rpc->is_udp != 0) {
	88	/* for udp sockets we only wait for pollin */
	89	return POLLIN;
	90	}
	91
84004dbf RS	92	if (rpc->outqueue) {
	93	events \|= POLLOUT;
	94	}
	95	return events;
	96	}
	97
	98	static int rpc_write_to_socket(struct rpc_context *rpc)
	99	{
183451cf	100	int64_t count;
84004dbf	101
4a2b0876 RS	102	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	103
84004dbf	104	if (rpc->fd == -1) {
1896d37b RS	105	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	106	return -1;
84004dbf RS	107	}
	108
	109	while (rpc->outqueue != NULL) {
183451cf	110	int64_t total;
84004dbf RS	111
	112	total = rpc->outqueue->outdata.size;
	113
6874f61e RS	114	#if defined(WIN32)
	115	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	116	#else
84004dbf	117	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
6874f61e	118	#endif
84004dbf RS	119	if (count == -1) {
84004dbf RS	120	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	121	return 0;
84004dbf RS	122	}
1896d37b RS	123	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	124	return -1;
84004dbf RS	125	}
	126
	127	rpc->outqueue->written += count;
	128	if (rpc->outqueue->written == total) {
	129	struct rpc_pdu *pdu = rpc->outqueue;
	130
	131	SLIST_REMOVE(&rpc->outqueue, pdu);
	132	SLIST_ADD_END(&rpc->waitpdu, pdu);
	133	}
	134	}
	135	return 0;
	136	}
	137
	138	static int rpc_read_from_socket(struct rpc_context *rpc)
	139	{
	140	int available;
	141	int size;
cdb19ec1	142	int pdu_size;
183451cf	143	int64_t count;
84004dbf	144
4a2b0876 RS	145	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	146
6874f61e RS	147	#if defined(WIN32)
	148	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
	149	#else
84004dbf	150	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
6874f61e	151	#endif
84004dbf RS	152	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	153	return -1;
	154	}
a8a1b858	155
84004dbf RS	156	if (available == 0) {
84004dbf RS	157	rpc_set_error(rpc, "Socket has been closed");
1896d37b	158	return -1;
84004dbf	159	}
cdb19ec1	160
0268794f RS	161	if (rpc->is_udp) {
	162	char *buf;
	163	socklen_t socklen = sizeof(rpc->udp_src);
	164
	165	buf = malloc(available);
	166	if (buf == NULL) {
	167	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	168	return -1;
	169	}
	170	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	171	if (count < 0) {
	172	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	173	free(buf);
	174	}
	175	if (rpc_process_pdu(rpc, buf, count) != 0) {
	176	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	177	free(buf);
	178	return -1;
	179	}
	180	free(buf);
	181	return 0;
	182	}
	183
cdb19ec1 RS	184	/* read record marker, 4 bytes at the beginning of every pdu */
	185	if (rpc->inbuf == NULL) {
	186	rpc->insize = 4;
	187	rpc->inbuf = malloc(rpc->insize);
	188	if (rpc->inbuf == NULL) {
	189	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	190	return -1;
	191	}
	192	}
	193	if (rpc->inpos < 4) {
	194	size = 4 - rpc->inpos;
	195
6874f61e RS	196	#if defined(WIN32)
	197	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	198	#else
cdb19ec1	199	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	200	#endif
cdb19ec1 RS	201	if (count == -1) {
	202	if (errno == EINTR) {
	203	return 0;
	204	}
	205	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	206	return -1;
	207	}
	208	available -= count;
	209	rpc->inpos += count;
	210	}
	211
	212	if (available == 0) {
	213	return 0;
	214	}
	215
	216	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	217	if (rpc->insize < pdu_size) {
	218	unsigned char *buf;
	219
	220	buf = malloc(pdu_size);
	221	if (buf == NULL) {
	222	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	223	return -1;
	224	}
	225	memcpy(buf, rpc->inbuf, rpc->insize);
	226	free(rpc->inbuf);
	227	rpc->inbuf = buf;
	228	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	229	}
cdb19ec1 RS	230
	231	size = available;
	232	if (size > rpc->insize - rpc->inpos) {
	233	size = rpc->insize - rpc->inpos;
84004dbf RS	234	}
84004dbf RS	235
6874f61e RS	236	#if defined(WIN32)
	237	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	238	#else
cdb19ec1	239	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	240	#endif
84004dbf RS	241	if (count == -1) {
84004dbf RS	242	if (errno == EINTR) {
84004dbf RS	243	return 0;
	244	}
	245	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	246	return -1;
84004dbf	247	}
cdb19ec1 RS	248	available -= count;
cdb19ec1 RS	249	rpc->inpos += count;
84004dbf	250
cdb19ec1 RS	251	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	252	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	253	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	254	return -1;
84004dbf	255	}
cdb19ec1 RS	256	free(rpc->inbuf);
	257	rpc->inbuf = NULL;
	258	rpc->insize = 0;
	259	rpc->inpos = 0;
84004dbf	260	}
cdb19ec1	261
84004dbf RS	262	return 0;
	263	}
	264
	265
	266
	267	int rpc_service(struct rpc_context *rpc, int revents)
	268	{
4a2b0876 RS	269	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	270
84004dbf	271	if (revents & POLLERR) {
fcc42bfe	272	#ifdef WIN32
a8a1b858	273	char err = 0;
fcc42bfe M	274	#else
	275	int err = 0;
	276	#endif
912f7ad5 RS	277	socklen_t err_size = sizeof(err);
	278
	279	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	280	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	281	if (err == 0) {
	282	err = errno;
	283	}
	284	rpc_set_error(rpc, "rpc_service: socket error "
	285	"%s(%d).",
	286	strerror(err), err);
84004dbf	287	} else {
912f7ad5 RS	288	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	289	"Unknown socket error.");
84004dbf	290	}
b990de23 RS	291	if (rpc->connect_cb != NULL) {
	292	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	293	}
84004dbf RS	294	return -1;
	295	}
	296	if (revents & POLLHUP) {
84004dbf	297	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	298	if (rpc->connect_cb != NULL) {
	299	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	300	}
1896d37b	301	return -1;
84004dbf RS	302	}
	303
	304	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	305	int err = 0;
	306	socklen_t err_size = sizeof(err);
	307
	308	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	309	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	310	if (err == 0) {
	311	err = errno;
	312	}
	313	rpc_set_error(rpc, "rpc_service: socket error "
	314	"%s(%d) while connecting.",
	315	strerror(err), err);
b990de23 RS	316	if (rpc->connect_cb != NULL) {
b990de23 RS	317	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	318	NULL, rpc->connect_data);
b990de23	319	}
912f7ad5 RS	320	return -1;
	321	}
	322
84004dbf	323	rpc->is_connected = 1;
b990de23 RS	324	if (rpc->connect_cb != NULL) {
	325	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	326	}
84004dbf RS	327	return 0;
	328	}
	329
b077fdeb RS	330	if (revents & POLLIN) {
b077fdeb RS	331	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	332	rpc_reconnect_requeue(rpc);
b077fdeb	333	return 0;
84004dbf RS	334	}
	335	}
	336
b077fdeb RS	337	if (revents & POLLOUT && rpc->outqueue != NULL) {
	338	if (rpc_write_to_socket(rpc) != 0) {
	339	rpc_set_error(rpc, "write to socket failed");
1896d37b	340	return -1;
84004dbf RS	341	}
	342	}
	343
	344	return 0;
	345	}
	346
1744ef90	347	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	348	{
4a2b0876 RS	349	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	350
1744ef90 RS	351	rpc->auto_reconnect = 1;
1744ef90 RS	352	}
84004dbf	353
1744ef90 RS	354	void rpc_unset_autoreconnect(struct rpc_context *rpc)
1744ef90 RS	355	{
4a2b0876 RS	356	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	357
1744ef90 RS	358	rpc->auto_reconnect = 0;
1744ef90 RS	359	}
070287e5	360
1744ef90 RS	361	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	362	{
	363	int socksize;
84004dbf	364
4a2b0876 RS	365	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	366
1744ef90	367	switch (s->ss_family) {
84004dbf	368	case AF_INET:
84004dbf	369	socksize = sizeof(struct sockaddr_in);
6874f61e	370	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	371	break;
1744ef90 RS	372	default:
	373	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	374	return -1;
84004dbf RS	375	}
	376
	377	if (rpc->fd == -1) {
	378	rpc_set_error(rpc, "Failed to open socket");
1896d37b	379	return -1;
84004dbf RS	380	}
84004dbf RS	381
07fd0cbc RS	382	/* Some systems allow you to set capabilities on an executable
	383	* to allow the file to be executed with privilege to bind to
	384	* privileged system ports, even if the user is not root.
	385	*
	386	* Opportunistically try to bind the socket to a low numbered
	387	* system port in the hope that the user is either root or the
	388	* executable has the CAP_NET_BIND_SERVICE.
	389	*
	390	* As soon as we fail the bind() with EACCES we know we will never
	391	* be able to bind to a system port so we terminate the loop.
	392	*
	393	* On linux, use
	394	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	395	* to make the executable able to bind to a system port.
ac559609 RI	396	*
	397	* On Windows, there is no concept of privileged ports. Thus
	398	* binding will usually succeed.
07fd0cbc	399	*/
ac559609 RI	400	{
	401	struct sockaddr_in sin;
	402	static int portOfs = 0;
	403	const int firstPort = 512; /* >= 512 according to Sun docs */
	404	const int portCount = IPPORT_RESERVED - firstPort;
	405	int startOfs = portOfs, port, rc;
	406
	407	do {
	408	rc = -1;
	409	port = htons(firstPort + portOfs);
	410	portOfs = (portOfs + 1) % portCount;
	411
	412	/* skip well-known ports */
	413	if (!getservbyport(port, "tcp")) {
	414	memset(&sin, 0, sizeof(sin));
	415	sin.sin_port = port;
	416	sin.sin_family = AF_INET;
	417	sin.sin_addr.s_addr = 0;
	418
	419	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	420	#if !defined(WIN32)
	421	/* we got EACCES, so don't try again */
	422	if (rc != 0 && errno == EACCES)
	423	break;
	424	#endif
07fd0cbc	425	}
ac559609	426	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	427	}
07fd0cbc	428
84004dbf	429	set_nonblocking(rpc->fd);
07fd0cbc	430
f96b24fa RI	431	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	432	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	433	return -1;
84004dbf RS	434	}
	435
	436	return 0;
	437	}
	438
1744ef90 RS	439	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	440	{
	441	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	442
4a2b0876 RS	443	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	444
1744ef90 RS	445	if (rpc->fd != -1) {
	446	rpc_set_error(rpc, "Trying to connect while already connected");
	447	return -1;
	448	}
	449
	450	if (rpc->is_udp != 0) {
	451	rpc_set_error(rpc, "Trying to connect on UDP socket");
	452	return -1;
	453	}
	454
	455	rpc->auto_reconnect = 0;
	456
	457	sin->sin_family = AF_INET;
	458	sin->sin_port = htons(port);
	459	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	460	rpc_set_error(rpc, "Not a valid server ip address");
	461	return -1;
	462	}
	463
	464
	465	switch (rpc->s.ss_family) {
	466	case AF_INET:
	467	#ifdef HAVE_SOCKADDR_LEN
	468	sin->sin_len = sizeof(struct sockaddr_in);
	469	#endif
	470	break;
	471	}
	472
	473	rpc->connect_cb = cb;
	474	rpc->connect_data = private_data;
	475
	476	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	477	return -1;
	478	}
	479
	480	return 0;
	481	}
	482
84004dbf RS	483	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	484	{
4a2b0876 RS	485	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	486
1744ef90 RS	487	rpc_unset_autoreconnect(rpc);
1744ef90 RS	488
84004dbf	489	if (rpc->fd != -1) {
6874f61e RS	490	#if defined(WIN32)
	491	closesocket(rpc->fd);
	492	#else
84004dbf	493	close(rpc->fd);
6874f61e	494	#endif
84004dbf RS	495	}
	496	rpc->fd = -1;
	497
	498	rpc->is_connected = 0;
	499
	500	rpc_error_all_pdus(rpc, error);
	501
	502	return 0;
	503	}
485bc9b9	504
1744ef90 RS	505	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
1744ef90 RS	506	{
4a2b0876 RS	507	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	508
1744ef90 RS	509	if (status != RPC_STATUS_SUCCESS) {
	510	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	511	return;
	512	}
	513
	514	rpc->is_connected = 1;
b990de23	515	rpc->connect_cb = NULL;
1744ef90 RS	516	}
	517
	518	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	519	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	520	{
	521	struct rpc_pdu *pdu;
	522
4a2b0876 RS	523	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	524
b077fdeb	525	if (rpc->fd != -1) {
6874f61e RS	526	#if defined(WIN32)
	527	closesocket(rpc->fd);
	528	#else
b077fdeb	529	close(rpc->fd);
6874f61e	530	#endif
b077fdeb RS	531	}
	532	rpc->fd = -1;
	533
	534	rpc->is_connected = 0;
	535
	536	/* socket is closed so we will not get any replies to any commands
	537	* in flight. Move them all over from the waitpdu queue back to the out queue
	538	*/
	539	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	540	SLIST_REMOVE(&rpc->waitpdu, pdu);
	541	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	542	/* we have to re-send the whole pdu again */
	543	pdu->written = 0;
	544	}
	545
	546	if (rpc->auto_reconnect != 0) {
	547	rpc->connect_cb = reconnect_cb;
	548
	549	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	550	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	551	return -1;
	552	}
b077fdeb RS	553	}
	554
	555	return 0;
	556	}
	557
485bc9b9 RS	558
	559	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	560	{
	561	struct addrinfo *ai = NULL;
	562	char service[6];
	563
4a2b0876 RS	564	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	565
485bc9b9 RS	566	if (rpc->is_udp == 0) {
	567	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	568	return -1;
	569	}
	570
6874f61e	571	sprintf(service, "%d", port);
485bc9b9 RS	572	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	573	rpc_set_error(rpc, "Invalid address:%s. "
	574	"Can not resolv into IPv4/v6 structure.");
	575	return -1;
	576	}
	577
	578	switch(ai->ai_family) {
	579	case AF_INET:
	580	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	581	if (rpc->fd == -1) {
	582	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	583	freeaddrinfo(ai);
	584	return -1;
	585	}
	586
	587	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	588	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	589	freeaddrinfo(ai);
	590	return -1;
	591	}
	592	break;
	593	default:
	594	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	595	freeaddrinfo(ai);
	596	return -1;
	597	}
	598
	599	freeaddrinfo(ai);
	600
	601	return 0;
	602	}
	603
5bf60dc6 RS	604	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	605	{
	606	struct addrinfo *ai = NULL;
	607	char service[6];
	608
4a2b0876 RS	609	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	610
5bf60dc6 RS	611	if (rpc->is_udp == 0) {
	612	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	613	return -1;
	614	}
	615
6874f61e	616	sprintf(service, "%d", port);
5bf60dc6 RS	617	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	618	rpc_set_error(rpc, "Invalid address:%s. "
	619	"Can not resolv into IPv4/v6 structure.");
	620	return -1;
	621	}
	622
	623	if (rpc->udp_dest) {
	624	free(rpc->udp_dest);
	625	rpc->udp_dest = NULL;
	626	}
	627	rpc->udp_dest = malloc(ai->ai_addrlen);
	628	if (rpc->udp_dest == NULL) {
	629	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	630	freeaddrinfo(ai);
5bf60dc6 RS	631	return -1;
	632	}
	633	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	634	freeaddrinfo(ai);
	635
	636	rpc->is_broadcast = is_broadcast;
bb4e9ed6	637	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	638
	639	return 0;
	640	}
c481da67 RS	641
	642	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	643	{
4a2b0876 RS	644	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	645
c481da67 RS	646	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	647	}
83aa785d RS	648
	649	int rpc_queue_length(struct rpc_context *rpc)
	650	{
	651	int i=0;
	652	struct rpc_pdu *pdu;
	653
4a2b0876 RS	654	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	655
83aa785d RS	656	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	657	i++;
	658	}
	659	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	660	i++;
	661	}
	662	return i;
	663	}