[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 <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)
{
	return rpc->fd;
}

int rpc_which_events(struct rpc_context *rpc)
{
	int 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;

	if (rpc == NULL) {
		return -1;
	}
	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;

#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)
{
	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)
{
	rpc->auto_reconnect = 1;
}

void rpc_unset_autoreconnect(struct rpc_context *rpc)
{
	rpc->auto_reconnect = 0;
}

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

	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;
	}


#if !defined(WIN32)
	/* 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.
	 */
	if (1) {
		int port;
		int one = 1;

		setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));

		for (port = 200; port < 500; port++) {
			struct sockaddr_in sin;

			memset(&sin, 0, sizeof(sin));
			sin.sin_port        = htons(port);
			sin.sin_family      = AF_INET;
			sin.sin_addr.s_addr = 0;

			if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) {
				/* we didnt get EACCES, so try again */
				continue;
			}
			break;
		}
	}
#endif

	set_nonblocking(rpc->fd);

#if defined(WIN32)
	if (connect(rpc->fd, (struct sockaddr *)s, socksize) == 0 && errno != EINPROGRESS   )
#else
	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) 
#endif
	{
		rpc_set_error(rpc, "connect() to server failed");
		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;

	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)
{
	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)
{
	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;

	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];

	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];

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

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

	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
		i++;
	}
	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
		i++;
	}
	return i;
}
Commit	Line	Data
dabf4152 AM	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	*/
5670ec6e AM	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/
dabf4152 AM	27
	28	#ifdef HAVE_CONFIG_H
	29	#include "config.h"
	30	#endif
	31	#include <stdio.h>
	32	#include <stdlib.h>
dabf4152	33	#include <fcntl.h>
dabf4152 AM	34	#include <string.h>
	35	#include <errno.h>
	36	#include <rpc/rpc.h>
	37	#include <rpc/xdr.h>
dabf4152 AM	38	#ifdef HAVE_SYS_FILIO_H
	39	#include <sys/filio.h>
	40	#endif
5670ec6e AM	41	#ifdef HAVE_SYS_SOCKIO_H
	42	#include <sys/sockio.h>
	43	#endif
dabf4152	44	#include <sys/types.h>
dabf4152 AM	45	#include "libnfs.h"
	46	#include "libnfs-raw.h"
	47	#include "libnfs-private.h"
	48	#include "slist.h"
	49
5670ec6e AM	50	#ifdef WIN32
	51	//has to be included after stdlib!!
	52	#include "win32_errnowrapper.h"
	53	#endif
	54
	55
	56	static int rpc_reconnect_requeue(struct rpc_context *rpc);
	57	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
	58
dabf4152 AM	59	static void set_nonblocking(int fd)
dabf4152 AM	60	{
5670ec6e AM	61	int v = 0;
	62	#if defined(WIN32)
	63	long nonblocking=1;
	64	v = ioctlsocket(fd, FIONBIO,&nonblocking);
	65	#else
dabf4152 AM	66	v = fcntl(fd, F_GETFL, 0);
dabf4152 AM	67	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
5670ec6e	68	#endif //FIXME
dabf4152 AM	69	}
	70
	71	int rpc_get_fd(struct rpc_context *rpc)
	72	{
	73	return rpc->fd;
	74	}
	75
	76	int rpc_which_events(struct rpc_context *rpc)
	77	{
	78	int events = rpc->is_connected ? POLLIN : POLLOUT;
	79
	80	if (rpc->is_udp != 0) {
	81	/* for udp sockets we only wait for pollin */
	82	return POLLIN;
	83	}
	84
	85	if (rpc->outqueue) {
	86	events \|= POLLOUT;
	87	}
	88	return events;
	89	}
	90
	91	static int rpc_write_to_socket(struct rpc_context *rpc)
	92	{
5670ec6e	93	int64_t count;
dabf4152 AM	94
	95	if (rpc == NULL) {
	96	return -1;
	97	}
	98	if (rpc->fd == -1) {
	99	rpc_set_error(rpc, "trying to write but not connected");
	100	return -1;
	101	}
	102
	103	while (rpc->outqueue != NULL) {
5670ec6e	104	int64_t total;
dabf4152 AM	105
	106	total = rpc->outqueue->outdata.size;
	107
5670ec6e AM	108	#if defined(WIN32)
	109	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	110	#else
dabf4152	111	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
5670ec6e	112	#endif
dabf4152 AM	113	if (count == -1) {
	114	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
	115	return 0;
	116	}
	117	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
	118	return -1;
	119	}
	120
	121	rpc->outqueue->written += count;
	122	if (rpc->outqueue->written == total) {
	123	struct rpc_pdu *pdu = rpc->outqueue;
	124
	125	SLIST_REMOVE(&rpc->outqueue, pdu);
	126	SLIST_ADD_END(&rpc->waitpdu, pdu);
	127	}
	128	}
	129	return 0;
	130	}
	131
	132	static int rpc_read_from_socket(struct rpc_context *rpc)
	133	{
	134	int available;
	135	int size;
	136	int pdu_size;
5670ec6e	137	int64_t count;
dabf4152	138
5670ec6e AM	139	#if defined(WIN32)
	140	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
	141	#else
dabf4152	142	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
5670ec6e	143	#endif
dabf4152 AM	144	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	145	return -1;
	146	}
5670ec6e	147
dabf4152 AM	148	if (available == 0) {
	149	rpc_set_error(rpc, "Socket has been closed");
	150	return -1;
	151	}
	152
	153	if (rpc->is_udp) {
	154	char *buf;
	155	socklen_t socklen = sizeof(rpc->udp_src);
	156
	157	buf = malloc(available);
	158	if (buf == NULL) {
	159	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	160	return -1;
	161	}
	162	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	163	if (count < 0) {
	164	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	165	free(buf);
	166	}
	167	if (rpc_process_pdu(rpc, buf, count) != 0) {
	168	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	169	free(buf);
	170	return -1;
	171	}
	172	free(buf);
	173	return 0;
	174	}
	175
	176	/* read record marker, 4 bytes at the beginning of every pdu */
	177	if (rpc->inbuf == NULL) {
	178	rpc->insize = 4;
	179	rpc->inbuf = malloc(rpc->insize);
	180	if (rpc->inbuf == NULL) {
	181	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	182	return -1;
	183	}
	184	}
	185	if (rpc->inpos < 4) {
	186	size = 4 - rpc->inpos;
	187
5670ec6e AM	188	#if defined(WIN32)
	189	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	190	#else
dabf4152	191	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
5670ec6e	192	#endif
dabf4152 AM	193	if (count == -1) {
	194	if (errno == EINTR) {
	195	return 0;
	196	}
	197	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	198	return -1;
	199	}
	200	available -= count;
	201	rpc->inpos += count;
	202	}
	203
	204	if (available == 0) {
	205	return 0;
	206	}
	207
	208	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	209	if (rpc->insize < pdu_size) {
	210	unsigned char *buf;
	211
	212	buf = malloc(pdu_size);
	213	if (buf == NULL) {
	214	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	215	return -1;
	216	}
	217	memcpy(buf, rpc->inbuf, rpc->insize);
	218	free(rpc->inbuf);
	219	rpc->inbuf = buf;
	220	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
	221	}
	222
	223	size = available;
	224	if (size > rpc->insize - rpc->inpos) {
	225	size = rpc->insize - rpc->inpos;
	226	}
	227
5670ec6e AM	228	#if defined(WIN32)
	229	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	230	#else
dabf4152	231	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
5670ec6e	232	#endif
dabf4152 AM	233	if (count == -1) {
	234	if (errno == EINTR) {
	235	return 0;
	236	}
	237	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	238	return -1;
	239	}
	240	available -= count;
	241	rpc->inpos += count;
	242
	243	if (rpc->inpos == rpc->insize) {
	244	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
	245	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
	246	return -1;
	247	}
	248	free(rpc->inbuf);
	249	rpc->inbuf = NULL;
	250	rpc->insize = 0;
	251	rpc->inpos = 0;
	252	}
	253
	254	return 0;
	255	}
	256
	257
	258
	259	int rpc_service(struct rpc_context *rpc, int revents)
	260	{
	261	if (revents & POLLERR) {
5670ec6e AM	262	#ifdef WIN32
	263	char err = 0;
	264	#else
dabf4152	265	int err = 0;
5670ec6e	266	#endif
dabf4152 AM	267	socklen_t err_size = sizeof(err);
	268
	269	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
5670ec6e	270	(char *)&err, &err_size) != 0 \|\| err != 0) {
dabf4152 AM	271	if (err == 0) {
	272	err = errno;
	273	}
	274	rpc_set_error(rpc, "rpc_service: socket error "
	275	"%s(%d).",
	276	strerror(err), err);
	277	} else {
	278	rpc_set_error(rpc, "rpc_service: POLLERR, "
	279	"Unknown socket error.");
	280	}
5670ec6e AM	281	if (rpc->connect_cb != NULL) {
	282	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	283	}
dabf4152 AM	284	return -1;
	285	}
	286	if (revents & POLLHUP) {
	287	rpc_set_error(rpc, "Socket failed with POLLHUP");
5670ec6e AM	288	if (rpc->connect_cb != NULL) {
	289	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	290	}
dabf4152 AM	291	return -1;
	292	}
	293
	294	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
	295	int err = 0;
	296	socklen_t err_size = sizeof(err);
	297
	298	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
5670ec6e	299	(char *)&err, &err_size) != 0 \|\| err != 0) {
dabf4152 AM	300	if (err == 0) {
	301	err = errno;
	302	}
	303	rpc_set_error(rpc, "rpc_service: socket error "
	304	"%s(%d) while connecting.",
	305	strerror(err), err);
5670ec6e AM	306	if (rpc->connect_cb != NULL) {
5670ec6e AM	307	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
dabf4152	308	NULL, rpc->connect_data);
5670ec6e	309	}
dabf4152 AM	310	return -1;
	311	}
	312
	313	rpc->is_connected = 1;
5670ec6e AM	314	if (rpc->connect_cb != NULL) {
	315	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	316	}
dabf4152 AM	317	return 0;
	318	}
	319
5670ec6e AM	320	if (revents & POLLIN) {
	321	if (rpc_read_from_socket(rpc) != 0) {
	322	rpc_reconnect_requeue(rpc);
	323	return 0;
	324	}
	325	}
	326
dabf4152 AM	327	if (revents & POLLOUT && rpc->outqueue != NULL) {
	328	if (rpc_write_to_socket(rpc) != 0) {
	329	rpc_set_error(rpc, "write to socket failed");
	330	return -1;
	331	}
	332	}
	333
5670ec6e AM	334	return 0;
	335	}
	336
	337	void rpc_set_autoreconnect(struct rpc_context *rpc)
	338	{
	339	rpc->auto_reconnect = 1;
	340	}
	341
	342	void rpc_unset_autoreconnect(struct rpc_context *rpc)
	343	{
	344	rpc->auto_reconnect = 0;
	345	}
	346
	347	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	348	{
	349	int socksize;
	350
	351	switch (s->ss_family) {
	352	case AF_INET:
	353	socksize = sizeof(struct sockaddr_in);
	354	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	355	break;
	356	default:
	357	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	358	return -1;
	359	}
	360
	361	if (rpc->fd == -1) {
	362	rpc_set_error(rpc, "Failed to open socket");
	363	return -1;
	364	}
	365
	366
	367	#if !defined(WIN32)
	368	/* Some systems allow you to set capabilities on an executable
	369	* to allow the file to be executed with privilege to bind to
	370	* privileged system ports, even if the user is not root.
	371	*
	372	* Opportunistically try to bind the socket to a low numbered
	373	* system port in the hope that the user is either root or the
	374	* executable has the CAP_NET_BIND_SERVICE.
	375	*
	376	* As soon as we fail the bind() with EACCES we know we will never
	377	* be able to bind to a system port so we terminate the loop.
	378	*
	379	* On linux, use
	380	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	381	* to make the executable able to bind to a system port.
	382	*/
	383	if (1) {
	384	int port;
	385	int one = 1;
	386
	387	setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
	388
	389	for (port = 200; port < 500; port++) {
	390	struct sockaddr_in sin;
	391
	392	memset(&sin, 0, sizeof(sin));
	393	sin.sin_port = htons(port);
	394	sin.sin_family = AF_INET;
	395	sin.sin_addr.s_addr = 0;
	396
	397	if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) {
398	/* we didnt get EACCES, so try again */
399	continue;
400	}
401	break;
dabf4152 AM	402	}
dabf4152 AM	403	}
5670ec6e	404	#endif
dabf4152	405
5670ec6e	406	set_nonblocking(rpc->fd);
dabf4152	407
5670ec6e AM	408	#if defined(WIN32)
	409	if (connect(rpc->fd, (struct sockaddr *)s, socksize) == 0 && errno != EINPROGRESS )
	410	#else
	411	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS)
	412	#endif
	413	{
	414	rpc_set_error(rpc, "connect() to server failed");
	415	return -1;
	416	}
	417
	418	return 0;
	419	}
dabf4152 AM	420
	421	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	422	{
5670ec6e	423	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
dabf4152 AM	424
	425	if (rpc->fd != -1) {
	426	rpc_set_error(rpc, "Trying to connect while already connected");
	427	return -1;
	428	}
	429
	430	if (rpc->is_udp != 0) {
	431	rpc_set_error(rpc, "Trying to connect on UDP socket");
	432	return -1;
	433	}
	434
5670ec6e AM	435	rpc->auto_reconnect = 0;
5670ec6e AM	436
dabf4152 AM	437	sin->sin_family = AF_INET;
	438	sin->sin_port = htons(port);
	439	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	440	rpc_set_error(rpc, "Not a valid server ip address");
	441	return -1;
	442	}
	443
5670ec6e AM	444
5670ec6e AM	445	switch (rpc->s.ss_family) {
dabf4152	446	case AF_INET:
dabf4152	447	#ifdef HAVE_SOCKADDR_LEN
5670ec6e	448	sin->sin_len = sizeof(struct sockaddr_in);
dabf4152	449	#endif
dabf4152 AM	450	break;
	451	}
	452
dabf4152 AM	453	rpc->connect_cb = cb;
	454	rpc->connect_data = private_data;
	455
5670ec6e	456	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
dabf4152	457	return -1;
5670ec6e	458	}
dabf4152 AM	459
	460	return 0;
	461	}
	462
	463	int rpc_disconnect(struct rpc_context rpc, char error)
	464	{
5670ec6e AM	465	rpc_unset_autoreconnect(rpc);
5670ec6e AM	466
dabf4152	467	if (rpc->fd != -1) {
5670ec6e AM	468	#if defined(WIN32)
	469	closesocket(rpc->fd);
	470	#else
dabf4152	471	close(rpc->fd);
5670ec6e	472	#endif
dabf4152 AM	473	}
	474	rpc->fd = -1;
	475
	476	rpc->is_connected = 0;
	477
	478	rpc_error_all_pdus(rpc, error);
	479
	480	return 0;
	481	}
	482
5670ec6e AM	483	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
	484	{
	485	if (status != RPC_STATUS_SUCCESS) {
	486	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	487	return;
	488	}
	489
	490	rpc->is_connected = 1;
	491	rpc->connect_cb = NULL;
	492	}
	493
	494	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	495	static int rpc_reconnect_requeue(struct rpc_context *rpc)
	496	{
	497	struct rpc_pdu *pdu;
	498
	499	if (rpc->fd != -1) {
	500	#if defined(WIN32)
	501	closesocket(rpc->fd);
	502	#else
	503	close(rpc->fd);
	504	#endif
	505	}
	506	rpc->fd = -1;
	507
	508	rpc->is_connected = 0;
	509
	510	/* socket is closed so we will not get any replies to any commands
	511	* in flight. Move them all over from the waitpdu queue back to the out queue
	512	*/
	513	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	514	SLIST_REMOVE(&rpc->waitpdu, pdu);
	515	SLIST_ADD(&rpc->outqueue, pdu);
	516	/* we have to re-send the whole pdu again */
	517	pdu->written = 0;
	518	}
	519
	520	if (rpc->auto_reconnect != 0) {
	521	rpc->connect_cb = reconnect_cb;
	522
	523	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	524	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	525	return -1;
	526	}
	527	}
	528
	529	return 0;
	530	}
	531
dabf4152 AM	532
	533	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	534	{
	535	struct addrinfo *ai = NULL;
	536	char service[6];
	537
	538	if (rpc->is_udp == 0) {
	539	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	540	return -1;
	541	}
	542
5670ec6e	543	sprintf(service, "%d", port);
dabf4152 AM	544	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	545	rpc_set_error(rpc, "Invalid address:%s. "
	546	"Can not resolv into IPv4/v6 structure.");
	547	return -1;
	548	}
	549
	550	switch(ai->ai_family) {
	551	case AF_INET:
	552	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	553	if (rpc->fd == -1) {
	554	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	555	freeaddrinfo(ai);
	556	return -1;
	557	}
	558
	559	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	560	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	561	freeaddrinfo(ai);
	562	return -1;
	563	}
	564	break;
	565	default:
	566	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	567	freeaddrinfo(ai);
	568	return -1;
	569	}
	570
	571	freeaddrinfo(ai);
	572
	573	return 0;
	574	}
	575
	576	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	577	{
	578	struct addrinfo *ai = NULL;
	579	char service[6];
	580
	581	if (rpc->is_udp == 0) {
	582	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	583	return -1;
	584	}
	585
5670ec6e	586	sprintf(service, "%d", port);
dabf4152 AM	587	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	588	rpc_set_error(rpc, "Invalid address:%s. "
	589	"Can not resolv into IPv4/v6 structure.");
	590	return -1;
	591	}
	592
	593	if (rpc->udp_dest) {
	594	free(rpc->udp_dest);
	595	rpc->udp_dest = NULL;
	596	}
	597	rpc->udp_dest = malloc(ai->ai_addrlen);
	598	if (rpc->udp_dest == NULL) {
	599	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
	600	return -1;
	601	}
	602	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	603	freeaddrinfo(ai);
	604
	605	rpc->is_broadcast = is_broadcast;
5670ec6e	606	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
dabf4152 AM	607
	608	return 0;
	609	}
	610
	611	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	612	{
	613	return (struct sockaddr *)&rpc->udp_src;
	614	}
5670ec6e AM	615
	616	int rpc_queue_length(struct rpc_context *rpc)
	617	{
	618	int i=0;
	619	struct rpc_pdu *pdu;
	620
	621	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	622	i++;
	623	}
	624	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	625	i++;
	626	}
	627	return i;
	628	}