[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 HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef AROS
#include "aros_compat.h"
#endif

#ifdef WIN32
#include "win32_compat.h"
#else
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netdb.h>
#endif/*WIN32*/

#ifdef HAVE_POLL_H
#include <poll.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.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 = ioctl(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;

		count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
		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);

	assert(rpc->magic == RPC_CONTEXT_MAGIC);

	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
		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;

		count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
		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;
	}

	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	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, port, rc;

		if (portOfs == 0) {
			portOfs = time(NULL) % 400;
		}
		startOfs = portOfs;
		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) {
		close(rpc->fd);
	}
	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) {
		close(rpc->fd);
	}
	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	*/
00748f36 RS	17	#ifdef HAVE_CONFIG_H
	18	#include "config.h"
	19	#endif
	20
	21	#ifdef AROS
	22	#include "aros_compat.h"
	23	#endif
	24
a8a1b858 M	25	#ifdef WIN32
	26	#include "win32_compat.h"
	27	#else
a8a1b858	28	#include <arpa/inet.h>
a8a1b858 M	29	#include <sys/socket.h>
	30	#include <netdb.h>
	31	#endif/WIN32/
84004dbf	32
00748f36 RS	33	#ifdef HAVE_POLL_H
00748f36 RS	34	#include <poll.h>
fc01d2a9	35	#endif
d7c6e9aa	36
00748f36 RS	37	#ifdef HAVE_UNISTD_H
00748f36 RS	38	#include <unistd.h>
d7c6e9aa RS	39	#endif
d7c6e9aa RS	40
00748f36 RS	41	#ifdef HAVE_SYS_IOCTL_H
00748f36 RS	42	#include <sys/ioctl.h>
d7c6e9aa RS	43	#endif
d7c6e9aa RS	44
84004dbf	45	#include <stdio.h>
98f5fee8	46	#include <stdlib.h>
4a2b0876	47	#include <assert.h>
84004dbf	48	#include <fcntl.h>
84004dbf RS	49	#include <string.h>
84004dbf RS	50	#include <errno.h>
fc01d2a9 TN	51	#ifdef HAVE_SYS_FILIO_H
	52	#include <sys/filio.h>
	53	#endif
647d2ea1 RS	54	#ifdef HAVE_SYS_SOCKIO_H
	55	#include <sys/sockio.h>
	56	#endif
485bc9b9	57	#include <sys/types.h>
763cd6e3	58	#include "libnfs-zdr.h"
84004dbf RS	59	#include "libnfs.h"
	60	#include "libnfs-raw.h"
	61	#include "libnfs-private.h"
	62	#include "slist.h"
	63
fcc42bfe M	64	#ifdef WIN32
	65	//has to be included after stdlib!!
	66	#include "win32_errnowrapper.h"
	67	#endif
	68
	69
1744ef90 RS	70	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	71	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	72
84004dbf RS	73	static void set_nonblocking(int fd)
84004dbf RS	74	{
99c14c9b	75	int v = 0;
6874f61e	76	#if defined(WIN32)
99c14c9b	77	long nonblocking=1;
622489d3	78	v = ioctl(fd, FIONBIO, &nonblocking);
6874f61e	79	#else
84004dbf RS	80	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	81	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	82	#endif //FIXME
84004dbf RS	83	}
	84
	85	int rpc_get_fd(struct rpc_context *rpc)
	86	{
4a2b0876 RS	87	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	88
84004dbf RS	89	return rpc->fd;
	90	}
	91
	92	int rpc_which_events(struct rpc_context *rpc)
	93	{
4a2b0876 RS	94	int events;
	95
	96	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	97
	98	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	99
5911f3e8 RS	100	if (rpc->is_udp != 0) {
	101	/* for udp sockets we only wait for pollin */
	102	return POLLIN;
	103	}
	104
84004dbf RS	105	if (rpc->outqueue) {
	106	events \|= POLLOUT;
	107	}
	108	return events;
	109	}
	110
	111	static int rpc_write_to_socket(struct rpc_context *rpc)
	112	{
d14e2838	113	int32_t count;
84004dbf	114
4a2b0876 RS	115	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	116
84004dbf	117	if (rpc->fd == -1) {
1896d37b RS	118	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	119	return -1;
84004dbf RS	120	}
	121
	122	while (rpc->outqueue != NULL) {
183451cf	123	int64_t total;
84004dbf RS	124
	125	total = rpc->outqueue->outdata.size;
	126
6874f61e	127	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
84004dbf RS	128	if (count == -1) {
84004dbf RS	129	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	130	return 0;
84004dbf RS	131	}
1896d37b RS	132	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	133	return -1;
84004dbf RS	134	}
	135
	136	rpc->outqueue->written += count;
	137	if (rpc->outqueue->written == total) {
	138	struct rpc_pdu *pdu = rpc->outqueue;
	139
	140	SLIST_REMOVE(&rpc->outqueue, pdu);
	141	SLIST_ADD_END(&rpc->waitpdu, pdu);
	142	}
	143	}
	144	return 0;
	145	}
	146
	147	static int rpc_read_from_socket(struct rpc_context *rpc)
	148	{
	149	int available;
	150	int size;
cdb19ec1	151	int pdu_size;
d14e2838	152	int32_t count;
84004dbf	153
f3a75078	154	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf	155
4a2b0876 RS	156	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	157
84004dbf RS	158	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	159	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	160	return -1;
	161	}
a8a1b858	162
84004dbf RS	163	if (available == 0) {
84004dbf RS	164	rpc_set_error(rpc, "Socket has been closed");
1896d37b	165	return -1;
84004dbf	166	}
cdb19ec1	167
0268794f RS	168	if (rpc->is_udp) {
	169	char *buf;
	170	socklen_t socklen = sizeof(rpc->udp_src);
	171
	172	buf = malloc(available);
	173	if (buf == NULL) {
	174	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	175	return -1;
	176	}
	177	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	178	if (count < 0) {
	179	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	180	free(buf);
	181	}
	182	if (rpc_process_pdu(rpc, buf, count) != 0) {
	183	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	184	free(buf);
	185	return -1;
	186	}
	187	free(buf);
	188	return 0;
	189	}
	190
cdb19ec1 RS	191	/* read record marker, 4 bytes at the beginning of every pdu */
	192	if (rpc->inbuf == NULL) {
	193	rpc->insize = 4;
	194	rpc->inbuf = malloc(rpc->insize);
	195	if (rpc->inbuf == NULL) {
	196	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	197	return -1;
	198	}
	199	}
	200	if (rpc->inpos < 4) {
	201	size = 4 - rpc->inpos;
	202
6874f61e	203	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
cdb19ec1 RS	204	if (count == -1) {
	205	if (errno == EINTR) {
	206	return 0;
	207	}
	208	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	209	return -1;
	210	}
	211	available -= count;
	212	rpc->inpos += count;
	213	}
	214
	215	if (available == 0) {
	216	return 0;
	217	}
	218
	219	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	220	if (rpc->insize < pdu_size) {
	221	unsigned char *buf;
	222
	223	buf = malloc(pdu_size);
	224	if (buf == NULL) {
	225	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	226	return -1;
	227	}
	228	memcpy(buf, rpc->inbuf, rpc->insize);
	229	free(rpc->inbuf);
	230	rpc->inbuf = buf;
	231	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	232	}
cdb19ec1 RS	233
	234	size = available;
	235	if (size > rpc->insize - rpc->inpos) {
	236	size = rpc->insize - rpc->inpos;
84004dbf RS	237	}
84004dbf RS	238
6874f61e	239	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
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	{
4a2b0876 RS	268	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 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	{
4a2b0876 RS	348	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 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	{
4a2b0876 RS	355	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 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
4a2b0876 RS	364	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 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.
ac559609 RI	395	*
	396	* On Windows, there is no concept of privileged ports. Thus
	397	* binding will usually succeed.
07fd0cbc	398	*/
ac559609 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;
cb5b8be2	404	int startOfs, port, rc;
ac559609	405
cb5b8be2 RS	406	if (portOfs == 0) {
	407	portOfs = time(NULL) % 400;
	408	}
	409	startOfs = portOfs;
ac559609 RI	410	do {
	411	rc = -1;
	412	port = htons(firstPort + portOfs);
	413	portOfs = (portOfs + 1) % portCount;
	414
	415	/* skip well-known ports */
	416	if (!getservbyport(port, "tcp")) {
	417	memset(&sin, 0, sizeof(sin));
	418	sin.sin_port = port;
	419	sin.sin_family = AF_INET;
	420	sin.sin_addr.s_addr = 0;
	421
	422	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	423	#if !defined(WIN32)
	424	/* we got EACCES, so don't try again */
	425	if (rc != 0 && errno == EACCES)
	426	break;
	427	#endif
07fd0cbc	428	}
ac559609	429	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	430	}
07fd0cbc	431
84004dbf	432	set_nonblocking(rpc->fd);
07fd0cbc	433
f96b24fa RI	434	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	435	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	436	return -1;
84004dbf RS	437	}
	438
	439	return 0;
	440	}
	441
1744ef90 RS	442	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	443	{
	444	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	445
4a2b0876 RS	446	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	447
1744ef90 RS	448	if (rpc->fd != -1) {
	449	rpc_set_error(rpc, "Trying to connect while already connected");
	450	return -1;
	451	}
	452
	453	if (rpc->is_udp != 0) {
	454	rpc_set_error(rpc, "Trying to connect on UDP socket");
	455	return -1;
	456	}
	457
	458	rpc->auto_reconnect = 0;
	459
	460	sin->sin_family = AF_INET;
	461	sin->sin_port = htons(port);
	462	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	463	rpc_set_error(rpc, "Not a valid server ip address");
	464	return -1;
	465	}
	466
	467
	468	switch (rpc->s.ss_family) {
	469	case AF_INET:
	470	#ifdef HAVE_SOCKADDR_LEN
	471	sin->sin_len = sizeof(struct sockaddr_in);
	472	#endif
	473	break;
	474	}
	475
	476	rpc->connect_cb = cb;
	477	rpc->connect_data = private_data;
	478
	479	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	480	return -1;
	481	}
	482
	483	return 0;
	484	}
	485
84004dbf RS	486	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	487	{
4a2b0876 RS	488	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	489
1744ef90 RS	490	rpc_unset_autoreconnect(rpc);
1744ef90 RS	491
84004dbf RS	492	if (rpc->fd != -1) {
	493	close(rpc->fd);
	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	{
4a2b0876 RS	506	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 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
4a2b0876 RS	522	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	523
b077fdeb RS	524	if (rpc->fd != -1) {
	525	close(rpc->fd);
	526	}
	527	rpc->fd = -1;
	528
	529	rpc->is_connected = 0;
	530
	531	/* socket is closed so we will not get any replies to any commands
	532	* in flight. Move them all over from the waitpdu queue back to the out queue
	533	*/
	534	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	535	SLIST_REMOVE(&rpc->waitpdu, pdu);
	536	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	537	/* we have to re-send the whole pdu again */
	538	pdu->written = 0;
	539	}
	540
	541	if (rpc->auto_reconnect != 0) {
	542	rpc->connect_cb = reconnect_cb;
	543
	544	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	545	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	546	return -1;
	547	}
b077fdeb RS	548	}
	549
	550	return 0;
	551	}
	552
485bc9b9 RS	553
	554	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	555	{
	556	struct addrinfo *ai = NULL;
	557	char service[6];
	558
4a2b0876 RS	559	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	560
485bc9b9 RS	561	if (rpc->is_udp == 0) {
	562	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	563	return -1;
	564	}
	565
6874f61e	566	sprintf(service, "%d", port);
485bc9b9 RS	567	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	568	rpc_set_error(rpc, "Invalid address:%s. "
	569	"Can not resolv into IPv4/v6 structure.");
	570	return -1;
	571	}
	572
	573	switch(ai->ai_family) {
	574	case AF_INET:
	575	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	576	if (rpc->fd == -1) {
	577	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	578	freeaddrinfo(ai);
	579	return -1;
	580	}
	581
	582	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	583	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	584	freeaddrinfo(ai);
	585	return -1;
	586	}
	587	break;
	588	default:
	589	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	590	freeaddrinfo(ai);
	591	return -1;
	592	}
	593
	594	freeaddrinfo(ai);
	595
	596	return 0;
	597	}
	598
5bf60dc6 RS	599	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	600	{
	601	struct addrinfo *ai = NULL;
	602	char service[6];
	603
4a2b0876 RS	604	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	605
5bf60dc6 RS	606	if (rpc->is_udp == 0) {
	607	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	608	return -1;
	609	}
	610
6874f61e	611	sprintf(service, "%d", port);
5bf60dc6 RS	612	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	613	rpc_set_error(rpc, "Invalid address:%s. "
	614	"Can not resolv into IPv4/v6 structure.");
	615	return -1;
	616	}
	617
	618	if (rpc->udp_dest) {
	619	free(rpc->udp_dest);
	620	rpc->udp_dest = NULL;
	621	}
	622	rpc->udp_dest = malloc(ai->ai_addrlen);
	623	if (rpc->udp_dest == NULL) {
	624	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	625	freeaddrinfo(ai);
5bf60dc6 RS	626	return -1;
	627	}
	628	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	629	freeaddrinfo(ai);
	630
	631	rpc->is_broadcast = is_broadcast;
bb4e9ed6	632	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	633
	634	return 0;
	635	}
c481da67 RS	636
	637	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	638	{
4a2b0876 RS	639	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	640
c481da67 RS	641	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	642	}
83aa785d RS	643
	644	int rpc_queue_length(struct rpc_context *rpc)
	645	{
	646	int i=0;
	647	struct rpc_pdu *pdu;
	648
4a2b0876 RS	649	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	650
83aa785d RS	651	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	652	i++;
	653	}
	654	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	655	i++;
	656	}
	657	return i;
	658	}