[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*/

#if defined(WIN32)
#include <winsock2.h>
#include <ws2tcpip.h>
#include <basetsd.h>
#define ssize_t SSIZE_T
#define MSG_DONTWAIT 0
#else
#include <unistd.h>
#include <poll.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netdb.h>
#endif

#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"

static int rpc_disconnect_requeue(struct rpc_context *rpc);

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)
{
	ssize_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) {
		ssize_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;
	ssize_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) {
		char 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).",
					       strerror(err), err);
		} else {
			rpc_set_error(rpc, "rpc_service: POLLERR, "
						"Unknown socket error.");
		}
		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");
		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);
			rpc->connect_cb(rpc, RPC_STATUS_ERROR,
					NULL, rpc->connect_data);
			return -1;
		}

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

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

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

	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;
	}

	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 (s.ss_family) {
	case AF_INET:
		socksize = sizeof(struct sockaddr_in);
#ifdef HAVE_SOCKADDR_LEN
		sin->sin_len = socksize;
#endif
		rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		break;
	}

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

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


#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 && GetLastError() != WSAEINPROGRESS   )
#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_disconnect(struct rpc_context *rpc, char *error)
{
	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;
}

/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
static int rpc_disconnect_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);
	}

	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
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
6874f61e RS	28	#if defined(WIN32)
	29	#include <winsock2.h>
	30	#include <ws2tcpip.h>
	31	#include <basetsd.h>
	32	#define ssize_t SSIZE_T
	33	#define MSG_DONTWAIT 0
	34	#else
	35	#include <unistd.h>
	36	#include <poll.h>
	37	#include <arpa/inet.h>
	38	#include <sys/ioctl.h>
	39	#include <sys/socket.h>
	40	#include <netdb.h>
	41	#endif
	42
fc01d2a9 TN	43	#ifdef HAVE_CONFIG_H
	44	#include "config.h"
	45	#endif
84004dbf	46	#include <stdio.h>
98f5fee8	47	#include <stdlib.h>
84004dbf	48	#include <fcntl.h>
84004dbf RS	49	#include <string.h>
84004dbf RS	50	#include <errno.h>
98f5fee8	51	#include <rpc/rpc.h>
84004dbf	52	#include <rpc/xdr.h>
fc01d2a9 TN	53	#ifdef HAVE_SYS_FILIO_H
	54	#include <sys/filio.h>
	55	#endif
647d2ea1 RS	56	#ifdef HAVE_SYS_SOCKIO_H
	57	#include <sys/sockio.h>
	58	#endif
485bc9b9	59	#include <sys/types.h>
84004dbf RS	60	#include "libnfs.h"
	61	#include "libnfs-raw.h"
	62	#include "libnfs-private.h"
	63	#include "slist.h"
	64
b077fdeb RS	65	static int rpc_disconnect_requeue(struct rpc_context *rpc);
b077fdeb RS	66
84004dbf RS	67	static void set_nonblocking(int fd)
84004dbf RS	68	{
99c14c9b	69	int v = 0;
6874f61e	70	#if defined(WIN32)
99c14c9b	71	long nonblocking=1;
99c14c9b	72	v = ioctlsocket(fd, FIONBIO,&nonblocking);
6874f61e	73	#else
84004dbf RS	74	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	75	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	76	#endif //FIXME
84004dbf RS	77	}
	78
	79	int rpc_get_fd(struct rpc_context *rpc)
	80	{
	81	return rpc->fd;
	82	}
	83
	84	int rpc_which_events(struct rpc_context *rpc)
	85	{
912f7ad5	86	int events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	87
5911f3e8 RS	88	if (rpc->is_udp != 0) {
	89	/* for udp sockets we only wait for pollin */
	90	return POLLIN;
	91	}
	92
84004dbf RS	93	if (rpc->outqueue) {
	94	events \|= POLLOUT;
	95	}
	96	return events;
	97	}
	98
	99	static int rpc_write_to_socket(struct rpc_context *rpc)
	100	{
	101	ssize_t count;
	102
	103	if (rpc == NULL) {
84004dbf RS	104	return -1;
	105	}
	106	if (rpc->fd == -1) {
1896d37b RS	107	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	108	return -1;
84004dbf RS	109	}
	110
	111	while (rpc->outqueue != NULL) {
	112	ssize_t total;
	113
	114	total = rpc->outqueue->outdata.size;
	115
6874f61e RS	116	#if defined(WIN32)
	117	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	118	#else
84004dbf	119	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
6874f61e	120	#endif
84004dbf RS	121	if (count == -1) {
84004dbf RS	122	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	123	return 0;
84004dbf RS	124	}
1896d37b RS	125	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	126	return -1;
84004dbf RS	127	}
	128
	129	rpc->outqueue->written += count;
	130	if (rpc->outqueue->written == total) {
	131	struct rpc_pdu *pdu = rpc->outqueue;
	132
	133	SLIST_REMOVE(&rpc->outqueue, pdu);
	134	SLIST_ADD_END(&rpc->waitpdu, pdu);
	135	}
	136	}
	137	return 0;
	138	}
	139
	140	static int rpc_read_from_socket(struct rpc_context *rpc)
	141	{
	142	int available;
	143	int size;
cdb19ec1	144	int pdu_size;
84004dbf RS	145	ssize_t count;
84004dbf 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	{
	269	if (revents & POLLERR) {
a8a1b858	270	char err = 0;
912f7ad5 RS	271	socklen_t err_size = sizeof(err);
	272
	273	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	274	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	275	if (err == 0) {
	276	err = errno;
	277	}
	278	rpc_set_error(rpc, "rpc_service: socket error "
	279	"%s(%d).",
	280	strerror(err), err);
84004dbf	281	} else {
912f7ad5 RS	282	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	283	"Unknown socket error.");
84004dbf RS	284	}
	285	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	286	return -1;
	287	}
	288	if (revents & POLLHUP) {
84004dbf RS	289	rpc_set_error(rpc, "Socket failed with POLLHUP");
84004dbf RS	290	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
1896d37b	291	return -1;
84004dbf RS	292	}
	293
	294	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	295	int err = 0;
	296	socklen_t err_size = sizeof(err);
	297
	298	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	299	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	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);
	306	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
	307	NULL, rpc->connect_data);
	308	return -1;
	309	}
	310
84004dbf RS	311	rpc->is_connected = 1;
	312	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	313	return 0;
	314	}
	315
b077fdeb RS	316	if (revents & POLLIN) {
b077fdeb RS	317	if (rpc_read_from_socket(rpc) != 0) {
83aa785d	318	rpc_disconnect_requeue(rpc);
b077fdeb	319	return 0;
84004dbf RS	320	}
	321	}
	322
b077fdeb RS	323	if (revents & POLLOUT && rpc->outqueue != NULL) {
	324	if (rpc_write_to_socket(rpc) != 0) {
	325	rpc_set_error(rpc, "write to socket failed");
1896d37b	326	return -1;
84004dbf RS	327	}
	328	}
	329
	330	return 0;
	331	}
	332
84004dbf RS	333	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	334	{
	335	struct sockaddr_storage s;
	336	struct sockaddr_in sin = (struct sockaddr_in )&s;
	337	int socksize;
	338
	339	if (rpc->fd != -1) {
	340	rpc_set_error(rpc, "Trying to connect while already connected");
84004dbf RS	341	return -1;
	342	}
	343
070287e5 RS	344	if (rpc->is_udp != 0) {
	345	rpc_set_error(rpc, "Trying to connect on UDP socket");
	346	return -1;
	347	}
	348
84004dbf RS	349	sin->sin_family = AF_INET;
	350	sin->sin_port = htons(port);
	351	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	352	rpc_set_error(rpc, "Not a valid server ip address");
1896d37b	353	return -1;
84004dbf RS	354	}
	355
	356	switch (s.ss_family) {
	357	case AF_INET:
84004dbf	358	socksize = sizeof(struct sockaddr_in);
f7f931c7	359	#ifdef HAVE_SOCKADDR_LEN
ea214e45 RS	360	sin->sin_len = socksize;
ea214e45 RS	361	#endif
6874f61e	362	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf RS	363	break;
	364	}
	365
	366	if (rpc->fd == -1) {
	367	rpc_set_error(rpc, "Failed to open socket");
1896d37b	368	return -1;
84004dbf RS	369	}
	370
	371	rpc->connect_cb = cb;
	372	rpc->connect_data = private_data;
	373
07fd0cbc RS	374
	375	#if !defined(WIN32)
	376	/* Some systems allow you to set capabilities on an executable
	377	* to allow the file to be executed with privilege to bind to
	378	* privileged system ports, even if the user is not root.
	379	*
	380	* Opportunistically try to bind the socket to a low numbered
	381	* system port in the hope that the user is either root or the
	382	* executable has the CAP_NET_BIND_SERVICE.
	383	*
	384	* As soon as we fail the bind() with EACCES we know we will never
	385	* be able to bind to a system port so we terminate the loop.
	386	*
	387	* On linux, use
	388	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	389	* to make the executable able to bind to a system port.
	390	*/
	391	if (1) {
	392	int port;
	393	int one = 1;
	394
	395	setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
	396
	397	for (port = 200; port < 500; port++) {
	398	struct sockaddr_in sin;
	399
07fd0cbc RS	400	memset(&sin, 0, sizeof(sin));
	401	sin.sin_port = htons(port);
	402	sin.sin_family = AF_INET;
	403	sin.sin_addr.s_addr = 0;
	404
	405	if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) {
	406	/* we didnt get EACCES, so try again */
	407	continue;
	408	}
	409	break;
	410	}
	411	}
	412	#endif
	413
84004dbf	414	set_nonblocking(rpc->fd);
07fd0cbc	415
4b0e8df9	416	#if defined(WIN32)
	417	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) == 0 && GetLastError() != WSAEINPROGRESS )
	418	#else
	419	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS)
	420	#endif
	421	{
84004dbf	422	rpc_set_error(rpc, "connect() to server failed");
1896d37b	423	return -1;
84004dbf RS	424	}
	425
	426	return 0;
	427	}
	428
	429	int rpc_disconnect(struct rpc_context rpc, char error)
	430	{
	431	if (rpc->fd != -1) {
6874f61e RS	432	#if defined(WIN32)
	433	closesocket(rpc->fd);
	434	#else
84004dbf	435	close(rpc->fd);
6874f61e	436	#endif
84004dbf RS	437	}
	438	rpc->fd = -1;
	439
	440	rpc->is_connected = 0;
	441
	442	rpc_error_all_pdus(rpc, error);
	443
	444	return 0;
	445	}
485bc9b9	446
b077fdeb RS	447	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
	448	static int rpc_disconnect_requeue(struct rpc_context *rpc)
	449	{
	450	struct rpc_pdu *pdu;
	451
	452	if (rpc->fd != -1) {
6874f61e RS	453	#if defined(WIN32)
	454	closesocket(rpc->fd);
	455	#else
b077fdeb	456	close(rpc->fd);
6874f61e	457	#endif
b077fdeb RS	458	}
	459	rpc->fd = -1;
	460
	461	rpc->is_connected = 0;
	462
	463	/* socket is closed so we will not get any replies to any commands
	464	* in flight. Move them all over from the waitpdu queue back to the out queue
	465	*/
	466	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	467	SLIST_REMOVE(&rpc->waitpdu, pdu);
	468	SLIST_ADD(&rpc->outqueue, pdu);
	469	}
	470
	471	return 0;
	472	}
	473
485bc9b9 RS	474
	475	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	476	{
	477	struct addrinfo *ai = NULL;
	478	char service[6];
	479
	480	if (rpc->is_udp == 0) {
	481	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	482	return -1;
	483	}
	484
6874f61e	485	sprintf(service, "%d", port);
485bc9b9 RS	486	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	487	rpc_set_error(rpc, "Invalid address:%s. "
	488	"Can not resolv into IPv4/v6 structure.");
	489	return -1;
	490	}
	491
	492	switch(ai->ai_family) {
	493	case AF_INET:
	494	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	495	if (rpc->fd == -1) {
	496	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	497	freeaddrinfo(ai);
	498	return -1;
	499	}
	500
	501	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	502	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	503	freeaddrinfo(ai);
	504	return -1;
	505	}
	506	break;
	507	default:
	508	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	509	freeaddrinfo(ai);
	510	return -1;
	511	}
	512
	513	freeaddrinfo(ai);
	514
	515	return 0;
	516	}
	517
5bf60dc6 RS	518	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	519	{
	520	struct addrinfo *ai = NULL;
	521	char service[6];
	522
	523	if (rpc->is_udp == 0) {
	524	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	525	return -1;
	526	}
	527
6874f61e	528	sprintf(service, "%d", port);
5bf60dc6 RS	529	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	530	rpc_set_error(rpc, "Invalid address:%s. "
	531	"Can not resolv into IPv4/v6 structure.");
	532	return -1;
	533	}
	534
	535	if (rpc->udp_dest) {
	536	free(rpc->udp_dest);
	537	rpc->udp_dest = NULL;
	538	}
	539	rpc->udp_dest = malloc(ai->ai_addrlen);
	540	if (rpc->udp_dest == NULL) {
	541	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
	542	return -1;
	543	}
	544	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	545	freeaddrinfo(ai);
	546
	547	rpc->is_broadcast = is_broadcast;
bb4e9ed6	548	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	549
	550	return 0;
	551	}
c481da67 RS	552
	553	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	554	{
	555	return (struct sockaddr *)&rpc->udp_src;
	556	}
83aa785d RS	557
	558	int rpc_queue_length(struct rpc_context *rpc)
	559	{
	560	int i=0;
	561	struct rpc_pdu *pdu;
	562
	563	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	564	i++;
	565	}
	566	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	567	i++;
	568	}
	569	return i;
	570	}