[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_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) {
#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.");
		}
		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 && 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_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
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>
98f5fee8	36	#include <rpc/rpc.h>
84004dbf	37	#include <rpc/xdr.h>
fc01d2a9 TN	38	#ifdef HAVE_SYS_FILIO_H
	39	#include <sys/filio.h>
	40	#endif
647d2ea1 RS	41	#ifdef HAVE_SYS_SOCKIO_H
	42	#include <sys/sockio.h>
	43	#endif
485bc9b9	44	#include <sys/types.h>
84004dbf RS	45	#include "libnfs.h"
	46	#include "libnfs-raw.h"
	47	#include "libnfs-private.h"
	48	#include "slist.h"
	49
fcc42bfe M	50	#ifdef WIN32
	51	//has to be included after stdlib!!
	52	#include "win32_errnowrapper.h"
	53	#endif
	54
	55
b077fdeb RS	56	static int rpc_disconnect_requeue(struct rpc_context *rpc);
b077fdeb RS	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	{
	92	ssize_t count;
	93
	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) {
	103	ssize_t total;
	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;
84004dbf RS	136	ssize_t count;
84004dbf RS	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 RS	279	}
	280	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	281	return -1;
	282	}
	283	if (revents & POLLHUP) {
84004dbf RS	284	rpc_set_error(rpc, "Socket failed with POLLHUP");
84004dbf RS	285	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
1896d37b	286	return -1;
84004dbf RS	287	}
	288
	289	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	290	int err = 0;
	291	socklen_t err_size = sizeof(err);
	292
	293	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	294	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	295	if (err == 0) {
	296	err = errno;
	297	}
	298	rpc_set_error(rpc, "rpc_service: socket error "
	299	"%s(%d) while connecting.",
	300	strerror(err), err);
	301	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
	302	NULL, rpc->connect_data);
	303	return -1;
	304	}
	305
84004dbf RS	306	rpc->is_connected = 1;
	307	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	308	return 0;
	309	}
	310
b077fdeb RS	311	if (revents & POLLIN) {
b077fdeb RS	312	if (rpc_read_from_socket(rpc) != 0) {
83aa785d	313	rpc_disconnect_requeue(rpc);
b077fdeb	314	return 0;
84004dbf RS	315	}
	316	}
	317
b077fdeb RS	318	if (revents & POLLOUT && rpc->outqueue != NULL) {
	319	if (rpc_write_to_socket(rpc) != 0) {
	320	rpc_set_error(rpc, "write to socket failed");
1896d37b	321	return -1;
84004dbf RS	322	}
	323	}
	324
	325	return 0;
	326	}
	327
84004dbf RS	328	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	329	{
	330	struct sockaddr_storage s;
	331	struct sockaddr_in sin = (struct sockaddr_in )&s;
	332	int socksize;
	333
	334	if (rpc->fd != -1) {
	335	rpc_set_error(rpc, "Trying to connect while already connected");
84004dbf RS	336	return -1;
	337	}
	338
070287e5 RS	339	if (rpc->is_udp != 0) {
	340	rpc_set_error(rpc, "Trying to connect on UDP socket");
	341	return -1;
	342	}
	343
84004dbf RS	344	sin->sin_family = AF_INET;
	345	sin->sin_port = htons(port);
	346	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	347	rpc_set_error(rpc, "Not a valid server ip address");
1896d37b	348	return -1;
84004dbf RS	349	}
	350
	351	switch (s.ss_family) {
	352	case AF_INET:
84004dbf	353	socksize = sizeof(struct sockaddr_in);
f7f931c7	354	#ifdef HAVE_SOCKADDR_LEN
ea214e45 RS	355	sin->sin_len = socksize;
ea214e45 RS	356	#endif
6874f61e	357	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf RS	358	break;
	359	}
	360
	361	if (rpc->fd == -1) {
	362	rpc_set_error(rpc, "Failed to open socket");
1896d37b	363	return -1;
84004dbf RS	364	}
	365
	366	rpc->connect_cb = cb;
	367	rpc->connect_data = private_data;
	368
07fd0cbc RS	369
	370	#if !defined(WIN32)
	371	/* Some systems allow you to set capabilities on an executable
	372	* to allow the file to be executed with privilege to bind to
	373	* privileged system ports, even if the user is not root.
	374	*
	375	* Opportunistically try to bind the socket to a low numbered
	376	* system port in the hope that the user is either root or the
	377	* executable has the CAP_NET_BIND_SERVICE.
	378	*
	379	* As soon as we fail the bind() with EACCES we know we will never
	380	* be able to bind to a system port so we terminate the loop.
	381	*
	382	* On linux, use
	383	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	384	* to make the executable able to bind to a system port.
	385	*/
	386	if (1) {
	387	int port;
	388	int one = 1;
	389
	390	setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one));
	391
	392	for (port = 200; port < 500; port++) {
	393	struct sockaddr_in sin;
	394
07fd0cbc RS	395	memset(&sin, 0, sizeof(sin));
	396	sin.sin_port = htons(port);
	397	sin.sin_family = AF_INET;
	398	sin.sin_addr.s_addr = 0;
	399
	400	if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) {
	401	/* we didnt get EACCES, so try again */
	402	continue;
	403	}
	404	break;
	405	}
	406	}
	407	#endif
	408
84004dbf	409	set_nonblocking(rpc->fd);
07fd0cbc	410
4b0e8df9	411	#if defined(WIN32)
fcc42bfe	412	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) == 0 && errno != EINPROGRESS )
4b0e8df9	413	#else
	414	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS)
	415	#endif
	416	{
84004dbf	417	rpc_set_error(rpc, "connect() to server failed");
1896d37b	418	return -1;
84004dbf RS	419	}
	420
	421	return 0;
	422	}
	423
	424	int rpc_disconnect(struct rpc_context rpc, char error)
	425	{
	426	if (rpc->fd != -1) {
6874f61e RS	427	#if defined(WIN32)
	428	closesocket(rpc->fd);
	429	#else
84004dbf	430	close(rpc->fd);
6874f61e	431	#endif
84004dbf RS	432	}
	433	rpc->fd = -1;
	434
	435	rpc->is_connected = 0;
	436
	437	rpc_error_all_pdus(rpc, error);
	438
	439	return 0;
	440	}
485bc9b9	441
b077fdeb RS	442	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
	443	static int rpc_disconnect_requeue(struct rpc_context *rpc)
	444	{
	445	struct rpc_pdu *pdu;
	446
	447	if (rpc->fd != -1) {
6874f61e RS	448	#if defined(WIN32)
	449	closesocket(rpc->fd);
	450	#else
b077fdeb	451	close(rpc->fd);
6874f61e	452	#endif
b077fdeb RS	453	}
	454	rpc->fd = -1;
	455
	456	rpc->is_connected = 0;
	457
	458	/* socket is closed so we will not get any replies to any commands
	459	* in flight. Move them all over from the waitpdu queue back to the out queue
	460	*/
	461	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	462	SLIST_REMOVE(&rpc->waitpdu, pdu);
	463	SLIST_ADD(&rpc->outqueue, pdu);
	464	}
	465
	466	return 0;
	467	}
	468
485bc9b9 RS	469
	470	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	471	{
	472	struct addrinfo *ai = NULL;
	473	char service[6];
	474
	475	if (rpc->is_udp == 0) {
	476	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	477	return -1;
	478	}
	479
6874f61e	480	sprintf(service, "%d", port);
485bc9b9 RS	481	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	482	rpc_set_error(rpc, "Invalid address:%s. "
	483	"Can not resolv into IPv4/v6 structure.");
	484	return -1;
	485	}
	486
	487	switch(ai->ai_family) {
	488	case AF_INET:
	489	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	490	if (rpc->fd == -1) {
	491	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	492	freeaddrinfo(ai);
	493	return -1;
	494	}
	495
	496	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	497	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	498	freeaddrinfo(ai);
	499	return -1;
	500	}
	501	break;
	502	default:
	503	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	504	freeaddrinfo(ai);
	505	return -1;
	506	}
	507
	508	freeaddrinfo(ai);
	509
	510	return 0;
	511	}
	512
5bf60dc6 RS	513	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	514	{
	515	struct addrinfo *ai = NULL;
	516	char service[6];
	517
	518	if (rpc->is_udp == 0) {
	519	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	520	return -1;
	521	}
	522
6874f61e	523	sprintf(service, "%d", port);
5bf60dc6 RS	524	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	525	rpc_set_error(rpc, "Invalid address:%s. "
	526	"Can not resolv into IPv4/v6 structure.");
	527	return -1;
	528	}
	529
	530	if (rpc->udp_dest) {
	531	free(rpc->udp_dest);
	532	rpc->udp_dest = NULL;
	533	}
	534	rpc->udp_dest = malloc(ai->ai_addrlen);
	535	if (rpc->udp_dest == NULL) {
	536	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
	537	return -1;
	538	}
	539	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	540	freeaddrinfo(ai);
	541
	542	rpc->is_broadcast = is_broadcast;
bb4e9ed6	543	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	544
	545	return 0;
	546	}
c481da67 RS	547
	548	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	549	{
	550	return (struct sockaddr *)&rpc->udp_src;
	551	}
83aa785d RS	552
	553	int rpc_queue_length(struct rpc_context *rpc)
	554	{
	555	int i=0;
	556	struct rpc_pdu *pdu;
	557
	558	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	559	i++;
	560	}
	561	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	562	i++;
	563	}
	564	return i;
	565	}