[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 <arpa/inet.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netdb.h>
#endif/*WIN32*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#ifdef HAVE_POLL_H
#include <poll.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);

	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>
a8a1b858 M	21	#include <arpa/inet.h>
	22	#include <sys/ioctl.h>
	23	#include <sys/socket.h>
	24	#include <netdb.h>
	25	#endif/WIN32/
84004dbf	26
fc01d2a9 TN	27	#ifdef HAVE_CONFIG_H
	28	#include "config.h"
	29	#endif
d7c6e9aa RS	30
	31	#ifdef AROS
	32	#include "aros_compat.h"
	33	#endif
	34
	35	#ifdef HAVE_POLL_H
	36	#include <poll.h>
	37	#endif
	38
84004dbf	39	#include <stdio.h>
98f5fee8	40	#include <stdlib.h>
4a2b0876	41	#include <assert.h>
84004dbf	42	#include <fcntl.h>
84004dbf RS	43	#include <string.h>
84004dbf RS	44	#include <errno.h>
fc01d2a9 TN	45	#ifdef HAVE_SYS_FILIO_H
	46	#include <sys/filio.h>
	47	#endif
647d2ea1 RS	48	#ifdef HAVE_SYS_SOCKIO_H
	49	#include <sys/sockio.h>
	50	#endif
485bc9b9	51	#include <sys/types.h>
763cd6e3	52	#include "libnfs-zdr.h"
84004dbf RS	53	#include "libnfs.h"
	54	#include "libnfs-raw.h"
	55	#include "libnfs-private.h"
	56	#include "slist.h"
	57
fcc42bfe M	58	#ifdef WIN32
	59	//has to be included after stdlib!!
	60	#include "win32_errnowrapper.h"
	61	#endif
	62
	63
1744ef90 RS	64	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	65	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	66
84004dbf RS	67	static void set_nonblocking(int fd)
84004dbf RS	68	{
99c14c9b	69	int v = 0;
6874f61e	70	#if defined(WIN32)
99c14c9b	71	long nonblocking=1;
99c14c9b	72	v = ioctlsocket(fd, FIONBIO,&nonblocking);
6874f61e	73	#else
84004dbf RS	74	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	75	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	76	#endif //FIXME
84004dbf RS	77	}
	78
	79	int rpc_get_fd(struct rpc_context *rpc)
	80	{
4a2b0876 RS	81	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	82
84004dbf RS	83	return rpc->fd;
	84	}
	85
	86	int rpc_which_events(struct rpc_context *rpc)
	87	{
4a2b0876 RS	88	int events;
	89
	90	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	91
	92	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	93
5911f3e8 RS	94	if (rpc->is_udp != 0) {
	95	/* for udp sockets we only wait for pollin */
	96	return POLLIN;
	97	}
	98
84004dbf RS	99	if (rpc->outqueue) {
	100	events \|= POLLOUT;
	101	}
	102	return events;
	103	}
	104
	105	static int rpc_write_to_socket(struct rpc_context *rpc)
	106	{
d14e2838	107	int32_t count;
84004dbf	108
4a2b0876 RS	109	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	110
84004dbf	111	if (rpc->fd == -1) {
1896d37b RS	112	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	113	return -1;
84004dbf RS	114	}
	115
	116	while (rpc->outqueue != NULL) {
183451cf	117	int64_t total;
84004dbf RS	118
	119	total = rpc->outqueue->outdata.size;
	120
6874f61e RS	121	#if defined(WIN32)
	122	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
	123	#else
84004dbf	124	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
6874f61e	125	#endif
84004dbf RS	126	if (count == -1) {
84004dbf RS	127	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	128	return 0;
84004dbf RS	129	}
1896d37b RS	130	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	131	return -1;
84004dbf RS	132	}
	133
	134	rpc->outqueue->written += count;
	135	if (rpc->outqueue->written == total) {
	136	struct rpc_pdu *pdu = rpc->outqueue;
	137
	138	SLIST_REMOVE(&rpc->outqueue, pdu);
	139	SLIST_ADD_END(&rpc->waitpdu, pdu);
	140	}
	141	}
	142	return 0;
	143	}
	144
	145	static int rpc_read_from_socket(struct rpc_context *rpc)
	146	{
	147	int available;
	148	int size;
cdb19ec1	149	int pdu_size;
d14e2838	150	int32_t count;
84004dbf	151
f3a75078	152	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf	153
4a2b0876 RS	154	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	155
6874f61e RS	156	#if defined(WIN32)
	157	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
	158	#else
84004dbf	159	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
6874f61e	160	#endif
84004dbf RS	161	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	162	return -1;
	163	}
a8a1b858	164
84004dbf RS	165	if (available == 0) {
84004dbf RS	166	rpc_set_error(rpc, "Socket has been closed");
1896d37b	167	return -1;
84004dbf	168	}
cdb19ec1	169
0268794f RS	170	if (rpc->is_udp) {
	171	char *buf;
	172	socklen_t socklen = sizeof(rpc->udp_src);
	173
	174	buf = malloc(available);
	175	if (buf == NULL) {
	176	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	177	return -1;
	178	}
	179	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	180	if (count < 0) {
	181	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	182	free(buf);
	183	}
	184	if (rpc_process_pdu(rpc, buf, count) != 0) {
	185	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	186	free(buf);
	187	return -1;
	188	}
	189	free(buf);
	190	return 0;
	191	}
	192
cdb19ec1 RS	193	/* read record marker, 4 bytes at the beginning of every pdu */
	194	if (rpc->inbuf == NULL) {
	195	rpc->insize = 4;
	196	rpc->inbuf = malloc(rpc->insize);
	197	if (rpc->inbuf == NULL) {
	198	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	199	return -1;
	200	}
	201	}
	202	if (rpc->inpos < 4) {
	203	size = 4 - rpc->inpos;
	204
6874f61e RS	205	#if defined(WIN32)
	206	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	207	#else
cdb19ec1	208	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	209	#endif
cdb19ec1 RS	210	if (count == -1) {
	211	if (errno == EINTR) {
	212	return 0;
	213	}
	214	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	215	return -1;
	216	}
	217	available -= count;
	218	rpc->inpos += count;
	219	}
	220
	221	if (available == 0) {
	222	return 0;
	223	}
	224
	225	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	226	if (rpc->insize < pdu_size) {
	227	unsigned char *buf;
	228
	229	buf = malloc(pdu_size);
	230	if (buf == NULL) {
	231	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	232	return -1;
	233	}
	234	memcpy(buf, rpc->inbuf, rpc->insize);
	235	free(rpc->inbuf);
	236	rpc->inbuf = buf;
	237	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	238	}
cdb19ec1 RS	239
	240	size = available;
	241	if (size > rpc->insize - rpc->inpos) {
	242	size = rpc->insize - rpc->inpos;
84004dbf RS	243	}
84004dbf RS	244
6874f61e RS	245	#if defined(WIN32)
	246	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
	247	#else
cdb19ec1	248	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
6874f61e	249	#endif
84004dbf RS	250	if (count == -1) {
84004dbf RS	251	if (errno == EINTR) {
84004dbf RS	252	return 0;
	253	}
	254	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	255	return -1;
84004dbf	256	}
cdb19ec1 RS	257	available -= count;
cdb19ec1 RS	258	rpc->inpos += count;
84004dbf	259
cdb19ec1 RS	260	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	261	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	262	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	263	return -1;
84004dbf	264	}
cdb19ec1 RS	265	free(rpc->inbuf);
	266	rpc->inbuf = NULL;
	267	rpc->insize = 0;
	268	rpc->inpos = 0;
84004dbf	269	}
cdb19ec1	270
84004dbf RS	271	return 0;
	272	}
	273
	274
	275
	276	int rpc_service(struct rpc_context *rpc, int revents)
	277	{
4a2b0876 RS	278	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	279
84004dbf	280	if (revents & POLLERR) {
fcc42bfe	281	#ifdef WIN32
a8a1b858	282	char err = 0;
fcc42bfe M	283	#else
	284	int err = 0;
	285	#endif
912f7ad5 RS	286	socklen_t err_size = sizeof(err);
	287
	288	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	289	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	290	if (err == 0) {
	291	err = errno;
	292	}
	293	rpc_set_error(rpc, "rpc_service: socket error "
	294	"%s(%d).",
	295	strerror(err), err);
84004dbf	296	} else {
912f7ad5 RS	297	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	298	"Unknown socket error.");
84004dbf	299	}
b990de23 RS	300	if (rpc->connect_cb != NULL) {
	301	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	302	}
84004dbf RS	303	return -1;
	304	}
	305	if (revents & POLLHUP) {
84004dbf	306	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	307	if (rpc->connect_cb != NULL) {
	308	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	309	}
1896d37b	310	return -1;
84004dbf RS	311	}
	312
	313	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	314	int err = 0;
	315	socklen_t err_size = sizeof(err);
	316
	317	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	318	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	319	if (err == 0) {
	320	err = errno;
	321	}
	322	rpc_set_error(rpc, "rpc_service: socket error "
	323	"%s(%d) while connecting.",
	324	strerror(err), err);
b990de23 RS	325	if (rpc->connect_cb != NULL) {
b990de23 RS	326	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	327	NULL, rpc->connect_data);
b990de23	328	}
912f7ad5 RS	329	return -1;
	330	}
	331
84004dbf	332	rpc->is_connected = 1;
b990de23 RS	333	if (rpc->connect_cb != NULL) {
	334	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	335	}
84004dbf RS	336	return 0;
	337	}
	338
b077fdeb RS	339	if (revents & POLLIN) {
b077fdeb RS	340	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	341	rpc_reconnect_requeue(rpc);
b077fdeb	342	return 0;
84004dbf RS	343	}
	344	}
	345
b077fdeb RS	346	if (revents & POLLOUT && rpc->outqueue != NULL) {
	347	if (rpc_write_to_socket(rpc) != 0) {
	348	rpc_set_error(rpc, "write to socket failed");
1896d37b	349	return -1;
84004dbf RS	350	}
	351	}
	352
	353	return 0;
	354	}
	355
1744ef90	356	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	357	{
4a2b0876 RS	358	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	359
1744ef90 RS	360	rpc->auto_reconnect = 1;
1744ef90 RS	361	}
84004dbf	362
1744ef90 RS	363	void rpc_unset_autoreconnect(struct rpc_context *rpc)
1744ef90 RS	364	{
4a2b0876 RS	365	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	366
1744ef90 RS	367	rpc->auto_reconnect = 0;
1744ef90 RS	368	}
070287e5	369
1744ef90 RS	370	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	371	{
	372	int socksize;
84004dbf	373
4a2b0876 RS	374	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	375
1744ef90	376	switch (s->ss_family) {
84004dbf	377	case AF_INET:
84004dbf	378	socksize = sizeof(struct sockaddr_in);
6874f61e	379	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	380	break;
1744ef90 RS	381	default:
	382	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	383	return -1;
84004dbf RS	384	}
	385
	386	if (rpc->fd == -1) {
	387	rpc_set_error(rpc, "Failed to open socket");
1896d37b	388	return -1;
84004dbf RS	389	}
84004dbf RS	390
07fd0cbc RS	391	/* Some systems allow you to set capabilities on an executable
	392	* to allow the file to be executed with privilege to bind to
	393	* privileged system ports, even if the user is not root.
	394	*
	395	* Opportunistically try to bind the socket to a low numbered
	396	* system port in the hope that the user is either root or the
	397	* executable has the CAP_NET_BIND_SERVICE.
	398	*
	399	* As soon as we fail the bind() with EACCES we know we will never
	400	* be able to bind to a system port so we terminate the loop.
	401	*
	402	* On linux, use
	403	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	404	* to make the executable able to bind to a system port.
ac559609 RI	405	*
	406	* On Windows, there is no concept of privileged ports. Thus
	407	* binding will usually succeed.
07fd0cbc	408	*/
ac559609 RI	409	{
	410	struct sockaddr_in sin;
	411	static int portOfs = 0;
	412	const int firstPort = 512; /* >= 512 according to Sun docs */
	413	const int portCount = IPPORT_RESERVED - firstPort;
	414	int startOfs = portOfs, port, rc;
	415
	416	do {
	417	rc = -1;
	418	port = htons(firstPort + portOfs);
	419	portOfs = (portOfs + 1) % portCount;
	420
	421	/* skip well-known ports */
	422	if (!getservbyport(port, "tcp")) {
	423	memset(&sin, 0, sizeof(sin));
	424	sin.sin_port = port;
	425	sin.sin_family = AF_INET;
	426	sin.sin_addr.s_addr = 0;
	427
	428	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	429	#if !defined(WIN32)
	430	/* we got EACCES, so don't try again */
	431	if (rc != 0 && errno == EACCES)
	432	break;
	433	#endif
07fd0cbc	434	}
ac559609	435	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	436	}
07fd0cbc	437
84004dbf	438	set_nonblocking(rpc->fd);
07fd0cbc	439
f96b24fa RI	440	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	441	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	442	return -1;
84004dbf RS	443	}
	444
	445	return 0;
	446	}
	447
1744ef90 RS	448	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	449	{
	450	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	451
4a2b0876 RS	452	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	453
1744ef90 RS	454	if (rpc->fd != -1) {
	455	rpc_set_error(rpc, "Trying to connect while already connected");
	456	return -1;
	457	}
	458
	459	if (rpc->is_udp != 0) {
	460	rpc_set_error(rpc, "Trying to connect on UDP socket");
	461	return -1;
	462	}
	463
	464	rpc->auto_reconnect = 0;
	465
	466	sin->sin_family = AF_INET;
	467	sin->sin_port = htons(port);
	468	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	469	rpc_set_error(rpc, "Not a valid server ip address");
	470	return -1;
	471	}
	472
	473
	474	switch (rpc->s.ss_family) {
	475	case AF_INET:
	476	#ifdef HAVE_SOCKADDR_LEN
	477	sin->sin_len = sizeof(struct sockaddr_in);
	478	#endif
	479	break;
	480	}
	481
	482	rpc->connect_cb = cb;
	483	rpc->connect_data = private_data;
	484
	485	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	486	return -1;
	487	}
	488
	489	return 0;
	490	}
	491
84004dbf RS	492	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	493	{
4a2b0876 RS	494	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	495
1744ef90 RS	496	rpc_unset_autoreconnect(rpc);
1744ef90 RS	497
84004dbf	498	if (rpc->fd != -1) {
6874f61e RS	499	#if defined(WIN32)
	500	closesocket(rpc->fd);
	501	#else
84004dbf	502	close(rpc->fd);
6874f61e	503	#endif
84004dbf RS	504	}
	505	rpc->fd = -1;
	506
	507	rpc->is_connected = 0;
	508
	509	rpc_error_all_pdus(rpc, error);
	510
	511	return 0;
	512	}
485bc9b9	513
1744ef90 RS	514	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
1744ef90 RS	515	{
4a2b0876 RS	516	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	517
1744ef90 RS	518	if (status != RPC_STATUS_SUCCESS) {
	519	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	520	return;
	521	}
	522
	523	rpc->is_connected = 1;
b990de23	524	rpc->connect_cb = NULL;
1744ef90 RS	525	}
	526
	527	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	528	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	529	{
	530	struct rpc_pdu *pdu;
	531
4a2b0876 RS	532	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	533
b077fdeb	534	if (rpc->fd != -1) {
6874f61e RS	535	#if defined(WIN32)
	536	closesocket(rpc->fd);
	537	#else
b077fdeb	538	close(rpc->fd);
6874f61e	539	#endif
b077fdeb RS	540	}
	541	rpc->fd = -1;
	542
	543	rpc->is_connected = 0;
	544
	545	/* socket is closed so we will not get any replies to any commands
	546	* in flight. Move them all over from the waitpdu queue back to the out queue
	547	*/
	548	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	549	SLIST_REMOVE(&rpc->waitpdu, pdu);
	550	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	551	/* we have to re-send the whole pdu again */
	552	pdu->written = 0;
	553	}
	554
	555	if (rpc->auto_reconnect != 0) {
	556	rpc->connect_cb = reconnect_cb;
	557
	558	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	559	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	560	return -1;
	561	}
b077fdeb RS	562	}
	563
	564	return 0;
	565	}
	566
485bc9b9 RS	567
	568	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	569	{
	570	struct addrinfo *ai = NULL;
	571	char service[6];
	572
4a2b0876 RS	573	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	574
485bc9b9 RS	575	if (rpc->is_udp == 0) {
	576	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	577	return -1;
	578	}
	579
6874f61e	580	sprintf(service, "%d", port);
485bc9b9 RS	581	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	582	rpc_set_error(rpc, "Invalid address:%s. "
	583	"Can not resolv into IPv4/v6 structure.");
	584	return -1;
	585	}
	586
	587	switch(ai->ai_family) {
	588	case AF_INET:
	589	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	590	if (rpc->fd == -1) {
	591	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	592	freeaddrinfo(ai);
	593	return -1;
	594	}
	595
	596	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	597	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	598	freeaddrinfo(ai);
	599	return -1;
	600	}
	601	break;
	602	default:
	603	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	604	freeaddrinfo(ai);
	605	return -1;
	606	}
	607
	608	freeaddrinfo(ai);
	609
	610	return 0;
	611	}
	612
5bf60dc6 RS	613	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	614	{
	615	struct addrinfo *ai = NULL;
	616	char service[6];
	617
4a2b0876 RS	618	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	619
5bf60dc6 RS	620	if (rpc->is_udp == 0) {
	621	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	622	return -1;
	623	}
	624
6874f61e	625	sprintf(service, "%d", port);
5bf60dc6 RS	626	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	627	rpc_set_error(rpc, "Invalid address:%s. "
	628	"Can not resolv into IPv4/v6 structure.");
	629	return -1;
	630	}
	631
	632	if (rpc->udp_dest) {
	633	free(rpc->udp_dest);
	634	rpc->udp_dest = NULL;
	635	}
	636	rpc->udp_dest = malloc(ai->ai_addrlen);
	637	if (rpc->udp_dest == NULL) {
	638	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	639	freeaddrinfo(ai);
5bf60dc6 RS	640	return -1;
	641	}
	642	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	643	freeaddrinfo(ai);
	644
	645	rpc->is_broadcast = is_broadcast;
bb4e9ed6	646	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	647
	648	return 0;
	649	}
c481da67 RS	650
	651	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	652	{
4a2b0876 RS	653	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	654
c481da67 RS	655	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	656	}
83aa785d RS	657
	658	int rpc_queue_length(struct rpc_context *rpc)
	659	{
	660	int i=0;
	661	struct rpc_pdu *pdu;
	662
4a2b0876 RS	663	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	664
83aa785d RS	665	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	666	i++;
	667	}
	668	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	669	i++;
	670	}
	671	return i;
	672	}