[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>
#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-zdr.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) {
		static int port = 200;
		int i;
		int one = 1;

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

		for (i = 0; i < 500; i++) {
			struct sockaddr_in sin;

			if(++port > 700) port = 200;

			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. %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;

	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
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>
84004dbf	33	#include <fcntl.h>
84004dbf RS	34	#include <string.h>
84004dbf RS	35	#include <errno.h>
fc01d2a9 TN	36	#ifdef HAVE_SYS_FILIO_H
	37	#include <sys/filio.h>
	38	#endif
647d2ea1 RS	39	#ifdef HAVE_SYS_SOCKIO_H
	40	#include <sys/sockio.h>
	41	#endif
485bc9b9	42	#include <sys/types.h>
763cd6e3	43	#include "libnfs-zdr.h"
84004dbf RS	44	#include "libnfs.h"
	45	#include "libnfs-raw.h"
	46	#include "libnfs-private.h"
	47	#include "slist.h"
	48
fcc42bfe M	49	#ifdef WIN32
	50	//has to be included after stdlib!!
	51	#include "win32_errnowrapper.h"
	52	#endif
	53
	54
1744ef90 RS	55	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	56	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	57
84004dbf RS	58	static void set_nonblocking(int fd)
84004dbf RS	59	{
99c14c9b	60	int v = 0;
6874f61e	61	#if defined(WIN32)
99c14c9b	62	long nonblocking=1;
99c14c9b	63	v = ioctlsocket(fd, FIONBIO,&nonblocking);
6874f61e	64	#else
84004dbf RS	65	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	66	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	67	#endif //FIXME
84004dbf RS	68	}
	69
	70	int rpc_get_fd(struct rpc_context *rpc)
	71	{
	72	return rpc->fd;
	73	}
	74
	75	int rpc_which_events(struct rpc_context *rpc)
	76	{
912f7ad5	77	int events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	78
5911f3e8 RS	79	if (rpc->is_udp != 0) {
	80	/* for udp sockets we only wait for pollin */
	81	return POLLIN;
	82	}
	83
84004dbf RS	84	if (rpc->outqueue) {
	85	events \|= POLLOUT;
	86	}
	87	return events;
	88	}
	89
	90	static int rpc_write_to_socket(struct rpc_context *rpc)
	91	{
183451cf	92	int64_t count;
84004dbf RS	93
84004dbf RS	94	if (rpc == NULL) {
84004dbf RS	95	return -1;
	96	}
	97	if (rpc->fd == -1) {
1896d37b RS	98	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	99	return -1;
84004dbf RS	100	}
	101
	102	while (rpc->outqueue != NULL) {
183451cf	103	int64_t total;
84004dbf RS	104
	105	total = rpc->outqueue->outdata.size;
	106
6874f61e RS	107	#if defined(WIN32)
	108	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	109	#else
84004dbf	110	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
6874f61e	111	#endif
84004dbf RS	112	if (count == -1) {
84004dbf RS	113	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	114	return 0;
84004dbf RS	115	}
1896d37b RS	116	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	117	return -1;
84004dbf RS	118	}
	119
	120	rpc->outqueue->written += count;
	121	if (rpc->outqueue->written == total) {
	122	struct rpc_pdu *pdu = rpc->outqueue;
	123
	124	SLIST_REMOVE(&rpc->outqueue, pdu);
	125	SLIST_ADD_END(&rpc->waitpdu, pdu);
	126	}
	127	}
	128	return 0;
	129	}
	130
	131	static int rpc_read_from_socket(struct rpc_context *rpc)
	132	{
	133	int available;
	134	int size;
cdb19ec1	135	int pdu_size;
183451cf	136	int64_t count;
84004dbf	137
6874f61e RS	138	#if defined(WIN32)
	139	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
	140	#else
84004dbf	141	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
6874f61e	142	#endif
84004dbf RS	143	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	144	return -1;
	145	}
a8a1b858	146
84004dbf RS	147	if (available == 0) {
84004dbf RS	148	rpc_set_error(rpc, "Socket has been closed");
1896d37b	149	return -1;
84004dbf	150	}
cdb19ec1	151
0268794f RS	152	if (rpc->is_udp) {
	153	char *buf;
	154	socklen_t socklen = sizeof(rpc->udp_src);
	155
	156	buf = malloc(available);
	157	if (buf == NULL) {
	158	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	159	return -1;
	160	}
	161	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	162	if (count < 0) {
	163	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	164	free(buf);
	165	}
	166	if (rpc_process_pdu(rpc, buf, count) != 0) {
	167	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	168	free(buf);
	169	return -1;
	170	}
	171	free(buf);
	172	return 0;
	173	}
	174
cdb19ec1 RS	175	/* read record marker, 4 bytes at the beginning of every pdu */
	176	if (rpc->inbuf == NULL) {
	177	rpc->insize = 4;
	178	rpc->inbuf = malloc(rpc->insize);
	179	if (rpc->inbuf == NULL) {
	180	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	181	return -1;
	182	}
	183	}
	184	if (rpc->inpos < 4) {
	185	size = 4 - rpc->inpos;
	186
6874f61e RS	187	#if defined(WIN32)
	188	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	189	#else
cdb19ec1	190	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	191	#endif
cdb19ec1 RS	192	if (count == -1) {
	193	if (errno == EINTR) {
	194	return 0;
	195	}
	196	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	197	return -1;
	198	}
	199	available -= count;
	200	rpc->inpos += count;
	201	}
	202
	203	if (available == 0) {
	204	return 0;
	205	}
	206
	207	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	208	if (rpc->insize < pdu_size) {
	209	unsigned char *buf;
	210
	211	buf = malloc(pdu_size);
	212	if (buf == NULL) {
	213	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	214	return -1;
	215	}
	216	memcpy(buf, rpc->inbuf, rpc->insize);
	217	free(rpc->inbuf);
	218	rpc->inbuf = buf;
	219	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	220	}
cdb19ec1 RS	221
	222	size = available;
	223	if (size > rpc->insize - rpc->inpos) {
	224	size = rpc->insize - rpc->inpos;
84004dbf RS	225	}
84004dbf RS	226
6874f61e RS	227	#if defined(WIN32)
	228	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	229	#else
cdb19ec1	230	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	231	#endif
84004dbf RS	232	if (count == -1) {
84004dbf RS	233	if (errno == EINTR) {
84004dbf RS	234	return 0;
	235	}
	236	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	237	return -1;
84004dbf	238	}
cdb19ec1 RS	239	available -= count;
cdb19ec1 RS	240	rpc->inpos += count;
84004dbf	241
cdb19ec1 RS	242	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	243	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	244	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	245	return -1;
84004dbf	246	}
cdb19ec1 RS	247	free(rpc->inbuf);
	248	rpc->inbuf = NULL;
	249	rpc->insize = 0;
	250	rpc->inpos = 0;
84004dbf	251	}
cdb19ec1	252
84004dbf RS	253	return 0;
	254	}
	255
	256
	257
	258	int rpc_service(struct rpc_context *rpc, int revents)
	259	{
	260	if (revents & POLLERR) {
fcc42bfe	261	#ifdef WIN32
a8a1b858	262	char err = 0;
fcc42bfe M	263	#else
	264	int err = 0;
	265	#endif
912f7ad5 RS	266	socklen_t err_size = sizeof(err);
	267
	268	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	269	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	270	if (err == 0) {
	271	err = errno;
	272	}
	273	rpc_set_error(rpc, "rpc_service: socket error "
	274	"%s(%d).",
	275	strerror(err), err);
84004dbf	276	} else {
912f7ad5 RS	277	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	278	"Unknown socket error.");
84004dbf	279	}
b990de23 RS	280	if (rpc->connect_cb != NULL) {
	281	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	282	}
84004dbf RS	283	return -1;
	284	}
	285	if (revents & POLLHUP) {
84004dbf	286	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	287	if (rpc->connect_cb != NULL) {
	288	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	289	}
1896d37b	290	return -1;
84004dbf RS	291	}
	292
	293	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	294	int err = 0;
	295	socklen_t err_size = sizeof(err);
	296
	297	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	298	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	299	if (err == 0) {
	300	err = errno;
	301	}
	302	rpc_set_error(rpc, "rpc_service: socket error "
	303	"%s(%d) while connecting.",
	304	strerror(err), err);
b990de23 RS	305	if (rpc->connect_cb != NULL) {
b990de23 RS	306	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	307	NULL, rpc->connect_data);
b990de23	308	}
912f7ad5 RS	309	return -1;
	310	}
	311
84004dbf	312	rpc->is_connected = 1;
b990de23 RS	313	if (rpc->connect_cb != NULL) {
	314	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	315	}
84004dbf RS	316	return 0;
	317	}
	318
b077fdeb RS	319	if (revents & POLLIN) {
b077fdeb RS	320	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	321	rpc_reconnect_requeue(rpc);
b077fdeb	322	return 0;
84004dbf RS	323	}
	324	}
	325
b077fdeb RS	326	if (revents & POLLOUT && rpc->outqueue != NULL) {
	327	if (rpc_write_to_socket(rpc) != 0) {
	328	rpc_set_error(rpc, "write to socket failed");
1896d37b	329	return -1;
84004dbf RS	330	}
	331	}
	332
	333	return 0;
	334	}
	335
1744ef90	336	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	337	{
1744ef90 RS	338	rpc->auto_reconnect = 1;
1744ef90 RS	339	}
84004dbf	340
1744ef90 RS	341	void rpc_unset_autoreconnect(struct rpc_context *rpc)
	342	{
	343	rpc->auto_reconnect = 0;
	344	}
070287e5	345
1744ef90 RS	346	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	347	{
	348	int socksize;
84004dbf	349
1744ef90	350	switch (s->ss_family) {
84004dbf	351	case AF_INET:
84004dbf	352	socksize = sizeof(struct sockaddr_in);
6874f61e	353	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	354	break;
1744ef90 RS	355	default:
	356	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	357	return -1;
84004dbf RS	358	}
	359
	360	if (rpc->fd == -1) {
	361	rpc_set_error(rpc, "Failed to open socket");
1896d37b	362	return -1;
84004dbf RS	363	}
84004dbf RS	364
07fd0cbc RS	365
	366	#if !defined(WIN32)
	367	/* Some systems allow you to set capabilities on an executable
	368	* to allow the file to be executed with privilege to bind to
	369	* privileged system ports, even if the user is not root.
	370	*
	371	* Opportunistically try to bind the socket to a low numbered
	372	* system port in the hope that the user is either root or the
	373	* executable has the CAP_NET_BIND_SERVICE.
	374	*
	375	* As soon as we fail the bind() with EACCES we know we will never
	376	* be able to bind to a system port so we terminate the loop.
	377	*
	378	* On linux, use
	379	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	380	* to make the executable able to bind to a system port.
	381	*/
	382	if (1) {
e6cac86f RS	383	static int port = 200;
e6cac86f RS	384	int i;
07fd0cbc RS	385	int one = 1;
	386
	387	setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
	388
e6cac86f	389	for (i = 0; i < 500; i++) {
07fd0cbc RS	390	struct sockaddr_in sin;
07fd0cbc RS	391
e6cac86f RS	392	if(++port > 700) port = 200;
e6cac86f RS	393
07fd0cbc RS	394	memset(&sin, 0, sizeof(sin));
	395	sin.sin_port = htons(port);
	396	sin.sin_family = AF_INET;
	397	sin.sin_addr.s_addr = 0;
	398
	399	if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) {
	400	/* we didnt get EACCES, so try again */
	401	continue;
	402	}
	403	break;
	404	}
	405	}
	406	#endif
	407
84004dbf	408	set_nonblocking(rpc->fd);
07fd0cbc	409
4b0e8df9	410	#if defined(WIN32)
1744ef90	411	if (connect(rpc->fd, (struct sockaddr *)s, socksize) == 0 && errno != EINPROGRESS )
4b0e8df9	412	#else
1744ef90	413	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS)
4b0e8df9	414	#endif
4b0e8df9	415	{
59f298f5	416	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	417	return -1;
84004dbf RS	418	}
	419
	420	return 0;
	421	}
	422
1744ef90 RS	423	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	424	{
	425	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	426
	427	if (rpc->fd != -1) {
	428	rpc_set_error(rpc, "Trying to connect while already connected");
	429	return -1;
	430	}
	431
	432	if (rpc->is_udp != 0) {
	433	rpc_set_error(rpc, "Trying to connect on UDP socket");
	434	return -1;
	435	}
	436
	437	rpc->auto_reconnect = 0;
	438
	439	sin->sin_family = AF_INET;
	440	sin->sin_port = htons(port);
	441	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	442	rpc_set_error(rpc, "Not a valid server ip address");
	443	return -1;
	444	}
	445
	446
	447	switch (rpc->s.ss_family) {
	448	case AF_INET:
	449	#ifdef HAVE_SOCKADDR_LEN
	450	sin->sin_len = sizeof(struct sockaddr_in);
	451	#endif
	452	break;
	453	}
	454
	455	rpc->connect_cb = cb;
	456	rpc->connect_data = private_data;
	457
	458	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	459	return -1;
	460	}
	461
	462	return 0;
	463	}
	464
84004dbf RS	465	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	466	{
1744ef90 RS	467	rpc_unset_autoreconnect(rpc);
1744ef90 RS	468
84004dbf	469	if (rpc->fd != -1) {
6874f61e RS	470	#if defined(WIN32)
	471	closesocket(rpc->fd);
	472	#else
84004dbf	473	close(rpc->fd);
6874f61e	474	#endif
84004dbf RS	475	}
	476	rpc->fd = -1;
	477
	478	rpc->is_connected = 0;
	479
	480	rpc_error_all_pdus(rpc, error);
	481
	482	return 0;
	483	}
485bc9b9	484
1744ef90 RS	485	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
	486	{
	487	if (status != RPC_STATUS_SUCCESS) {
	488	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	489	return;
	490	}
	491
	492	rpc->is_connected = 1;
b990de23	493	rpc->connect_cb = NULL;
1744ef90 RS	494	}
	495
	496	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	497	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	498	{
	499	struct rpc_pdu *pdu;
	500
	501	if (rpc->fd != -1) {
6874f61e RS	502	#if defined(WIN32)
	503	closesocket(rpc->fd);
	504	#else
b077fdeb	505	close(rpc->fd);
6874f61e	506	#endif
b077fdeb RS	507	}
	508	rpc->fd = -1;
	509
	510	rpc->is_connected = 0;
	511
	512	/* socket is closed so we will not get any replies to any commands
	513	* in flight. Move them all over from the waitpdu queue back to the out queue
	514	*/
	515	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	516	SLIST_REMOVE(&rpc->waitpdu, pdu);
	517	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	518	/* we have to re-send the whole pdu again */
	519	pdu->written = 0;
	520	}
	521
	522	if (rpc->auto_reconnect != 0) {
	523	rpc->connect_cb = reconnect_cb;
	524
	525	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	526	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	527	return -1;
	528	}
b077fdeb RS	529	}
	530
	531	return 0;
	532	}
	533
485bc9b9 RS	534
	535	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	536	{
	537	struct addrinfo *ai = NULL;
	538	char service[6];
	539
	540	if (rpc->is_udp == 0) {
	541	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	542	return -1;
	543	}
	544
6874f61e	545	sprintf(service, "%d", port);
485bc9b9 RS	546	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	547	rpc_set_error(rpc, "Invalid address:%s. "
	548	"Can not resolv into IPv4/v6 structure.");
	549	return -1;
	550	}
	551
	552	switch(ai->ai_family) {
	553	case AF_INET:
	554	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	555	if (rpc->fd == -1) {
	556	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	557	freeaddrinfo(ai);
	558	return -1;
	559	}
	560
	561	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	562	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	563	freeaddrinfo(ai);
	564	return -1;
	565	}
	566	break;
	567	default:
	568	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	569	freeaddrinfo(ai);
	570	return -1;
	571	}
	572
	573	freeaddrinfo(ai);
	574
	575	return 0;
	576	}
	577
5bf60dc6 RS	578	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	579	{
	580	struct addrinfo *ai = NULL;
	581	char service[6];
	582
	583	if (rpc->is_udp == 0) {
	584	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	585	return -1;
	586	}
	587
6874f61e	588	sprintf(service, "%d", port);
5bf60dc6 RS	589	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	590	rpc_set_error(rpc, "Invalid address:%s. "
	591	"Can not resolv into IPv4/v6 structure.");
	592	return -1;
	593	}
	594
	595	if (rpc->udp_dest) {
	596	free(rpc->udp_dest);
	597	rpc->udp_dest = NULL;
	598	}
	599	rpc->udp_dest = malloc(ai->ai_addrlen);
	600	if (rpc->udp_dest == NULL) {
	601	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
	602	return -1;
	603	}
	604	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	605	freeaddrinfo(ai);
	606
	607	rpc->is_broadcast = is_broadcast;
bb4e9ed6	608	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	609
	610	return 0;
	611	}
c481da67 RS	612
	613	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	614	{
	615	return (struct sockaddr *)&rpc->udp_src;
	616	}
83aa785d RS	617
	618	int rpc_queue_length(struct rpc_context *rpc)
	619	{
	620	int i=0;
	621	struct rpc_pdu *pdu;
	622
	623	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	624	i++;
	625	}
	626	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	627	i++;
	628	}
	629	return i;
	630	}