[deb_libnfs.git] / lib / socket.c

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

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

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

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#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)
{
	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	return rpc->fd;
}

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	events = rpc->is_connected ? POLLIN : POLLOUT;

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

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

static int rpc_write_to_socket(struct rpc_context *rpc)
{
	int32_t count;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

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

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

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

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

static int rpc_read_from_socket(struct rpc_context *rpc)
{
	int available;
	int size;
	int pdu_size;
	int32_t count;

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

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

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

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

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

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

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

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

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

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

	return 0;
}


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

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

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

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

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

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

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

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

	return 0;
}

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

	rpc->auto_reconnect = 1;
}

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

	rpc->auto_reconnect = 0;
}

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

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

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

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

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

	set_nonblocking(rpc->fd);

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

	return 0;
}	    

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

	rpc->auto_reconnect = 0;

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


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

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

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

	return 0;
}	    

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

	rpc_unset_autoreconnect(rpc);

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

	rpc->is_connected = 0;

	rpc_error_all_pdus(rpc, error);

	return 0;
}

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

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

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

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

	rpc->is_connected = 0;

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

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

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

	return 0;
}


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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

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

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

	freeaddrinfo(ai);

	return 0;
}

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

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

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

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

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

	return 0;
}

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

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

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

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
		i++;
	}
	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
		i++;
	}
	return i;
}
Commit	Line	Data
84004dbf RS	1	/*
	2	Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU Lesser General Public License as published by
	6	the Free Software Foundation; either version 2.1 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU Lesser General Public License for more details.
	13
	14	You should have received a copy of the GNU Lesser General Public License
	15	along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
a8a1b858 M	17	#ifdef WIN32
	18	#include "win32_compat.h"
	19	#else
	20	#include <unistd.h>
	21	#include <poll.h>
	22	#include <arpa/inet.h>
	23	#include <sys/ioctl.h>
	24	#include <sys/socket.h>
	25	#include <netdb.h>
	26	#endif/WIN32/
84004dbf	27
fc01d2a9 TN	28	#ifdef HAVE_CONFIG_H
	29	#include "config.h"
	30	#endif
84004dbf	31	#include <stdio.h>
98f5fee8	32	#include <stdlib.h>
f3a75078	33	#include <assert.h>
84004dbf	34	#include <fcntl.h>
84004dbf RS	35	#include <string.h>
84004dbf RS	36	#include <errno.h>
fc01d2a9 TN	37	#ifdef HAVE_SYS_FILIO_H
	38	#include <sys/filio.h>
	39	#endif
647d2ea1 RS	40	#ifdef HAVE_SYS_SOCKIO_H
	41	#include <sys/sockio.h>
	42	#endif
485bc9b9	43	#include <sys/types.h>
763cd6e3	44	#include "libnfs-zdr.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
1744ef90 RS	56	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	57	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	58
84004dbf RS	59	static void set_nonblocking(int fd)
84004dbf RS	60	{
99c14c9b	61	int v = 0;
6874f61e	62	#if defined(WIN32)
99c14c9b	63	long nonblocking=1;
99c14c9b	64	v = ioctlsocket(fd, FIONBIO,&nonblocking);
6874f61e	65	#else
84004dbf RS	66	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	67	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	68	#endif //FIXME
84004dbf RS	69	}
	70
	71	int rpc_get_fd(struct rpc_context *rpc)
	72	{
f3a75078 RS	73	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	74
84004dbf RS	75	return rpc->fd;
	76	}
	77
	78	int rpc_which_events(struct rpc_context *rpc)
	79	{
f3a75078 RS	80	int events;
	81
	82	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	83
	84	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	85
5911f3e8 RS	86	if (rpc->is_udp != 0) {
	87	/* for udp sockets we only wait for pollin */
	88	return POLLIN;
	89	}
	90
84004dbf RS	91	if (rpc->outqueue) {
	92	events \|= POLLOUT;
	93	}
	94	return events;
	95	}
	96
	97	static int rpc_write_to_socket(struct rpc_context *rpc)
	98	{
d14e2838	99	int32_t count;
84004dbf	100
f3a75078 RS	101	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	102
84004dbf	103	if (rpc->fd == -1) {
1896d37b RS	104	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	105	return -1;
84004dbf RS	106	}
	107
	108	while (rpc->outqueue != NULL) {
183451cf	109	int64_t total;
84004dbf RS	110
	111	total = rpc->outqueue->outdata.size;
	112
6874f61e RS	113	#if defined(WIN32)
	114	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	115	#else
84004dbf	116	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
6874f61e	117	#endif
84004dbf RS	118	if (count == -1) {
84004dbf RS	119	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	120	return 0;
84004dbf RS	121	}
1896d37b RS	122	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	123	return -1;
84004dbf RS	124	}
	125
	126	rpc->outqueue->written += count;
	127	if (rpc->outqueue->written == total) {
	128	struct rpc_pdu *pdu = rpc->outqueue;
	129
	130	SLIST_REMOVE(&rpc->outqueue, pdu);
	131	SLIST_ADD_END(&rpc->waitpdu, pdu);
	132	}
	133	}
	134	return 0;
	135	}
	136
	137	static int rpc_read_from_socket(struct rpc_context *rpc)
	138	{
	139	int available;
	140	int size;
cdb19ec1	141	int pdu_size;
d14e2838	142	int32_t count;
84004dbf	143
f3a75078 RS	144	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	145
6874f61e RS	146	#if defined(WIN32)
	147	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
	148	#else
84004dbf	149	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
6874f61e	150	#endif
84004dbf RS	151	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	152	return -1;
	153	}
a8a1b858	154
84004dbf RS	155	if (available == 0) {
84004dbf RS	156	rpc_set_error(rpc, "Socket has been closed");
1896d37b	157	return -1;
84004dbf	158	}
cdb19ec1	159
0268794f RS	160	if (rpc->is_udp) {
	161	char *buf;
	162	socklen_t socklen = sizeof(rpc->udp_src);
	163
	164	buf = malloc(available);
	165	if (buf == NULL) {
	166	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	167	return -1;
	168	}
	169	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	170	if (count < 0) {
	171	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	172	free(buf);
	173	}
	174	if (rpc_process_pdu(rpc, buf, count) != 0) {
	175	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	176	free(buf);
	177	return -1;
	178	}
	179	free(buf);
	180	return 0;
	181	}
	182
cdb19ec1 RS	183	/* read record marker, 4 bytes at the beginning of every pdu */
	184	if (rpc->inbuf == NULL) {
	185	rpc->insize = 4;
	186	rpc->inbuf = malloc(rpc->insize);
	187	if (rpc->inbuf == NULL) {
	188	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	189	return -1;
	190	}
	191	}
	192	if (rpc->inpos < 4) {
	193	size = 4 - rpc->inpos;
	194
6874f61e RS	195	#if defined(WIN32)
	196	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	197	#else
cdb19ec1	198	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	199	#endif
cdb19ec1 RS	200	if (count == -1) {
	201	if (errno == EINTR) {
	202	return 0;
	203	}
	204	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	205	return -1;
	206	}
	207	available -= count;
	208	rpc->inpos += count;
	209	}
	210
	211	if (available == 0) {
	212	return 0;
	213	}
	214
	215	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	216	if (rpc->insize < pdu_size) {
	217	unsigned char *buf;
	218
	219	buf = malloc(pdu_size);
	220	if (buf == NULL) {
	221	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	222	return -1;
	223	}
	224	memcpy(buf, rpc->inbuf, rpc->insize);
	225	free(rpc->inbuf);
	226	rpc->inbuf = buf;
	227	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	228	}
cdb19ec1 RS	229
	230	size = available;
	231	if (size > rpc->insize - rpc->inpos) {
	232	size = rpc->insize - rpc->inpos;
84004dbf RS	233	}
84004dbf RS	234
6874f61e RS	235	#if defined(WIN32)
	236	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	237	#else
cdb19ec1	238	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	239	#endif
84004dbf RS	240	if (count == -1) {
84004dbf RS	241	if (errno == EINTR) {
84004dbf RS	242	return 0;
	243	}
	244	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	245	return -1;
84004dbf	246	}
cdb19ec1 RS	247	available -= count;
cdb19ec1 RS	248	rpc->inpos += count;
84004dbf	249
cdb19ec1 RS	250	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	251	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	252	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	253	return -1;
84004dbf	254	}
cdb19ec1 RS	255	free(rpc->inbuf);
	256	rpc->inbuf = NULL;
	257	rpc->insize = 0;
	258	rpc->inpos = 0;
84004dbf	259	}
cdb19ec1	260
84004dbf RS	261	return 0;
	262	}
	263
	264
	265
	266	int rpc_service(struct rpc_context *rpc, int revents)
	267	{
f3a75078 RS	268	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	269
84004dbf	270	if (revents & POLLERR) {
fcc42bfe	271	#ifdef WIN32
a8a1b858	272	char err = 0;
fcc42bfe M	273	#else
	274	int err = 0;
	275	#endif
912f7ad5 RS	276	socklen_t err_size = sizeof(err);
	277
	278	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	279	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	280	if (err == 0) {
	281	err = errno;
	282	}
	283	rpc_set_error(rpc, "rpc_service: socket error "
	284	"%s(%d).",
	285	strerror(err), err);
84004dbf	286	} else {
912f7ad5 RS	287	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	288	"Unknown socket error.");
84004dbf	289	}
b990de23 RS	290	if (rpc->connect_cb != NULL) {
	291	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	292	}
84004dbf RS	293	return -1;
	294	}
	295	if (revents & POLLHUP) {
84004dbf	296	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	297	if (rpc->connect_cb != NULL) {
	298	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	299	}
1896d37b	300	return -1;
84004dbf RS	301	}
	302
	303	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	304	int err = 0;
	305	socklen_t err_size = sizeof(err);
	306
	307	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	308	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	309	if (err == 0) {
	310	err = errno;
	311	}
	312	rpc_set_error(rpc, "rpc_service: socket error "
	313	"%s(%d) while connecting.",
	314	strerror(err), err);
b990de23 RS	315	if (rpc->connect_cb != NULL) {
b990de23 RS	316	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	317	NULL, rpc->connect_data);
b990de23	318	}
912f7ad5 RS	319	return -1;
	320	}
	321
84004dbf	322	rpc->is_connected = 1;
b990de23 RS	323	if (rpc->connect_cb != NULL) {
	324	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	325	}
84004dbf RS	326	return 0;
	327	}
	328
b077fdeb RS	329	if (revents & POLLIN) {
b077fdeb RS	330	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	331	rpc_reconnect_requeue(rpc);
b077fdeb	332	return 0;
84004dbf RS	333	}
	334	}
	335
b077fdeb RS	336	if (revents & POLLOUT && rpc->outqueue != NULL) {
	337	if (rpc_write_to_socket(rpc) != 0) {
	338	rpc_set_error(rpc, "write to socket failed");
1896d37b	339	return -1;
84004dbf RS	340	}
	341	}
	342
	343	return 0;
	344	}
	345
1744ef90	346	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	347	{
f3a75078 RS	348	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	349
1744ef90 RS	350	rpc->auto_reconnect = 1;
1744ef90 RS	351	}
84004dbf	352
1744ef90 RS	353	void rpc_unset_autoreconnect(struct rpc_context *rpc)
1744ef90 RS	354	{
f3a75078 RS	355	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	356
1744ef90 RS	357	rpc->auto_reconnect = 0;
1744ef90 RS	358	}
070287e5	359
1744ef90 RS	360	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	361	{
	362	int socksize;
84004dbf	363
f3a75078 RS	364	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	365
1744ef90	366	switch (s->ss_family) {
84004dbf	367	case AF_INET:
84004dbf	368	socksize = sizeof(struct sockaddr_in);
6874f61e	369	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	370	break;
1744ef90 RS	371	default:
	372	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	373	return -1;
84004dbf RS	374	}
	375
	376	if (rpc->fd == -1) {
	377	rpc_set_error(rpc, "Failed to open socket");
1896d37b	378	return -1;
84004dbf RS	379	}
84004dbf RS	380
07fd0cbc RS	381	/* Some systems allow you to set capabilities on an executable
	382	* to allow the file to be executed with privilege to bind to
	383	* privileged system ports, even if the user is not root.
	384	*
	385	* Opportunistically try to bind the socket to a low numbered
	386	* system port in the hope that the user is either root or the
	387	* executable has the CAP_NET_BIND_SERVICE.
	388	*
	389	* As soon as we fail the bind() with EACCES we know we will never
	390	* be able to bind to a system port so we terminate the loop.
	391	*
	392	* On linux, use
	393	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	394	* to make the executable able to bind to a system port.
2521374f RI	395	*
	396	* On Windows, there is no concept of privileged ports. Thus
	397	* binding will usually succeed.
07fd0cbc	398	*/
2521374f RI	399	{
	400	struct sockaddr_in sin;
	401	static int portOfs = 0;
	402	const int firstPort = 512; /* >= 512 according to Sun docs */
	403	const int portCount = IPPORT_RESERVED - firstPort;
	404	int startOfs = portOfs, port, rc;
	405
	406	do {
	407	rc = -1;
	408	port = htons(firstPort + portOfs);
	409	portOfs = (portOfs + 1) % portCount;
	410
	411	/* skip well-known ports */
	412	if (!getservbyport(port, "tcp")) {
	413	memset(&sin, 0, sizeof(sin));
	414	sin.sin_port = port;
	415	sin.sin_family = AF_INET;
	416	sin.sin_addr.s_addr = 0;
	417
	418	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	419	#if !defined(WIN32)
	420	/* we got EACCES, so don't try again */
	421	if (rc != 0 && errno == EACCES)
	422	break;
	423	#endif
07fd0cbc	424	}
2521374f	425	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	426	}
07fd0cbc	427
84004dbf	428	set_nonblocking(rpc->fd);
07fd0cbc	429
456c0b14 RI	430	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
456c0b14 RI	431	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	432	return -1;
84004dbf RS	433	}
	434
	435	return 0;
	436	}
	437
1744ef90 RS	438	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	439	{
	440	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	441
f3a75078 RS	442	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	443
1744ef90 RS	444	if (rpc->fd != -1) {
	445	rpc_set_error(rpc, "Trying to connect while already connected");
	446	return -1;
	447	}
	448
	449	if (rpc->is_udp != 0) {
	450	rpc_set_error(rpc, "Trying to connect on UDP socket");
	451	return -1;
	452	}
	453
	454	rpc->auto_reconnect = 0;
	455
	456	sin->sin_family = AF_INET;
	457	sin->sin_port = htons(port);
	458	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	459	rpc_set_error(rpc, "Not a valid server ip address");
	460	return -1;
	461	}
	462
	463
	464	switch (rpc->s.ss_family) {
	465	case AF_INET:
	466	#ifdef HAVE_SOCKADDR_LEN
	467	sin->sin_len = sizeof(struct sockaddr_in);
	468	#endif
	469	break;
	470	}
	471
	472	rpc->connect_cb = cb;
	473	rpc->connect_data = private_data;
	474
	475	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	476	return -1;
	477	}
	478
	479	return 0;
	480	}
	481
84004dbf RS	482	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	483	{
f3a75078 RS	484	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	485
1744ef90 RS	486	rpc_unset_autoreconnect(rpc);
1744ef90 RS	487
84004dbf	488	if (rpc->fd != -1) {
6874f61e RS	489	#if defined(WIN32)
	490	closesocket(rpc->fd);
	491	#else
84004dbf	492	close(rpc->fd);
6874f61e	493	#endif
84004dbf RS	494	}
	495	rpc->fd = -1;
	496
	497	rpc->is_connected = 0;
	498
	499	rpc_error_all_pdus(rpc, error);
	500
	501	return 0;
	502	}
485bc9b9	503
1744ef90 RS	504	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
1744ef90 RS	505	{
f3a75078 RS	506	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	507
1744ef90 RS	508	if (status != RPC_STATUS_SUCCESS) {
	509	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	510	return;
	511	}
	512
	513	rpc->is_connected = 1;
b990de23	514	rpc->connect_cb = NULL;
1744ef90 RS	515	}
	516
	517	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	518	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	519	{
	520	struct rpc_pdu *pdu;
	521
f3a75078 RS	522	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	523
b077fdeb	524	if (rpc->fd != -1) {
6874f61e RS	525	#if defined(WIN32)
	526	closesocket(rpc->fd);
	527	#else
b077fdeb	528	close(rpc->fd);
6874f61e	529	#endif
b077fdeb RS	530	}
	531	rpc->fd = -1;
	532
	533	rpc->is_connected = 0;
	534
	535	/* socket is closed so we will not get any replies to any commands
	536	* in flight. Move them all over from the waitpdu queue back to the out queue
	537	*/
	538	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	539	SLIST_REMOVE(&rpc->waitpdu, pdu);
	540	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	541	/* we have to re-send the whole pdu again */
	542	pdu->written = 0;
	543	}
	544
	545	if (rpc->auto_reconnect != 0) {
	546	rpc->connect_cb = reconnect_cb;
	547
	548	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	549	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	550	return -1;
	551	}
b077fdeb RS	552	}
	553
	554	return 0;
	555	}
	556
485bc9b9 RS	557
	558	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	559	{
	560	struct addrinfo *ai = NULL;
	561	char service[6];
	562
f3a75078 RS	563	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	564
485bc9b9 RS	565	if (rpc->is_udp == 0) {
	566	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	567	return -1;
	568	}
	569
6874f61e	570	sprintf(service, "%d", port);
485bc9b9 RS	571	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	572	rpc_set_error(rpc, "Invalid address:%s. "
	573	"Can not resolv into IPv4/v6 structure.");
	574	return -1;
	575	}
	576
	577	switch(ai->ai_family) {
	578	case AF_INET:
	579	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	580	if (rpc->fd == -1) {
	581	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	582	freeaddrinfo(ai);
	583	return -1;
	584	}
	585
	586	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	587	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	588	freeaddrinfo(ai);
	589	return -1;
	590	}
	591	break;
	592	default:
	593	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	594	freeaddrinfo(ai);
	595	return -1;
	596	}
	597
	598	freeaddrinfo(ai);
	599
	600	return 0;
	601	}
	602
5bf60dc6 RS	603	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	604	{
	605	struct addrinfo *ai = NULL;
	606	char service[6];
	607
f3a75078 RS	608	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	609
5bf60dc6 RS	610	if (rpc->is_udp == 0) {
	611	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	612	return -1;
	613	}
	614
6874f61e	615	sprintf(service, "%d", port);
5bf60dc6 RS	616	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	617	rpc_set_error(rpc, "Invalid address:%s. "
	618	"Can not resolv into IPv4/v6 structure.");
	619	return -1;
	620	}
	621
	622	if (rpc->udp_dest) {
	623	free(rpc->udp_dest);
	624	rpc->udp_dest = NULL;
	625	}
	626	rpc->udp_dest = malloc(ai->ai_addrlen);
	627	if (rpc->udp_dest == NULL) {
	628	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
2811861b	629	freeaddrinfo(ai);
5bf60dc6 RS	630	return -1;
	631	}
	632	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	633	freeaddrinfo(ai);
	634
	635	rpc->is_broadcast = is_broadcast;
bb4e9ed6	636	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	637
	638	return 0;
	639	}
c481da67 RS	640
	641	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	642	{
f3a75078 RS	643	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	644
c481da67 RS	645	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	646	}
83aa785d RS	647
	648	int rpc_queue_length(struct rpc_context *rpc)
	649	{
	650	int i=0;
	651	struct rpc_pdu *pdu;
	652
f3a75078 RS	653	assert(rpc->magic == RPC_CONTEXT_MAGIC);
f3a75078 RS	654
83aa785d RS	655	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	656	i++;
	657	}
	658	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	659	i++;
	660	}
	661	return i;
	662	}