[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>
#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

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif

#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif

#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#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	29	#endif/WIN32/
84004dbf	30
00748f36 RS	31	#ifdef HAVE_POLL_H
00748f36 RS	32	#include <poll.h>
fc01d2a9	33	#endif
d7c6e9aa	34
00748f36 RS	35	#ifdef HAVE_UNISTD_H
00748f36 RS	36	#include <unistd.h>
d7c6e9aa RS	37	#endif
d7c6e9aa RS	38
00748f36 RS	39	#ifdef HAVE_SYS_IOCTL_H
00748f36 RS	40	#include <sys/ioctl.h>
d7c6e9aa RS	41	#endif
d7c6e9aa RS	42
7057e733 RS	43	#ifdef HAVE_SYS_SOCKET_H
	44	#include <sys/socket.h>
	45	#endif
	46
bff8fe46 RS	47	#ifdef HAVE_NETDB_H
	48	#include <netdb.h>
	49	#endif
	50
fc01d2a9 TN	51	#ifdef HAVE_SYS_FILIO_H
	52	#include <sys/filio.h>
	53	#endif
bff8fe46	54
647d2ea1 RS	55	#ifdef HAVE_SYS_SOCKIO_H
	56	#include <sys/sockio.h>
	57	#endif
bff8fe46 RS	58
	59	#include <stdio.h>
	60	#include <stdlib.h>
	61	#include <assert.h>
	62	#include <fcntl.h>
	63	#include <string.h>
	64	#include <errno.h>
485bc9b9	65	#include <sys/types.h>
763cd6e3	66	#include "libnfs-zdr.h"
84004dbf RS	67	#include "libnfs.h"
	68	#include "libnfs-raw.h"
	69	#include "libnfs-private.h"
	70	#include "slist.h"
	71
fcc42bfe M	72	#ifdef WIN32
	73	//has to be included after stdlib!!
	74	#include "win32_errnowrapper.h"
	75	#endif
	76
	77
1744ef90 RS	78	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	79	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	80
84004dbf RS	81	static void set_nonblocking(int fd)
84004dbf RS	82	{
99c14c9b	83	int v = 0;
6874f61e	84	#if defined(WIN32)
99c14c9b	85	long nonblocking=1;
622489d3	86	v = ioctl(fd, FIONBIO, &nonblocking);
6874f61e	87	#else
84004dbf RS	88	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	89	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	90	#endif //FIXME
84004dbf RS	91	}
	92
	93	int rpc_get_fd(struct rpc_context *rpc)
	94	{
4a2b0876 RS	95	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	96
84004dbf RS	97	return rpc->fd;
	98	}
	99
	100	int rpc_which_events(struct rpc_context *rpc)
	101	{
4a2b0876 RS	102	int events;
	103
	104	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	105
	106	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	107
5911f3e8 RS	108	if (rpc->is_udp != 0) {
	109	/* for udp sockets we only wait for pollin */
	110	return POLLIN;
	111	}
	112
84004dbf RS	113	if (rpc->outqueue) {
	114	events \|= POLLOUT;
	115	}
	116	return events;
	117	}
	118
	119	static int rpc_write_to_socket(struct rpc_context *rpc)
	120	{
d14e2838	121	int32_t count;
84004dbf	122
4a2b0876 RS	123	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	124
84004dbf	125	if (rpc->fd == -1) {
1896d37b RS	126	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	127	return -1;
84004dbf RS	128	}
	129
	130	while (rpc->outqueue != NULL) {
183451cf	131	int64_t total;
84004dbf RS	132
	133	total = rpc->outqueue->outdata.size;
	134
6874f61e	135	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
84004dbf RS	136	if (count == -1) {
84004dbf RS	137	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	138	return 0;
84004dbf RS	139	}
1896d37b RS	140	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	141	return -1;
84004dbf RS	142	}
	143
	144	rpc->outqueue->written += count;
	145	if (rpc->outqueue->written == total) {
	146	struct rpc_pdu *pdu = rpc->outqueue;
	147
	148	SLIST_REMOVE(&rpc->outqueue, pdu);
	149	SLIST_ADD_END(&rpc->waitpdu, pdu);
	150	}
	151	}
	152	return 0;
	153	}
	154
	155	static int rpc_read_from_socket(struct rpc_context *rpc)
	156	{
	157	int available;
	158	int size;
cdb19ec1	159	int pdu_size;
d14e2838	160	int32_t count;
84004dbf	161
f3a75078	162	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf	163
4a2b0876 RS	164	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	165
84004dbf RS	166	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	167	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	168	return -1;
	169	}
a8a1b858	170
84004dbf RS	171	if (available == 0) {
84004dbf RS	172	rpc_set_error(rpc, "Socket has been closed");
1896d37b	173	return -1;
84004dbf	174	}
cdb19ec1	175
0268794f RS	176	if (rpc->is_udp) {
	177	char *buf;
	178	socklen_t socklen = sizeof(rpc->udp_src);
	179
	180	buf = malloc(available);
	181	if (buf == NULL) {
	182	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	183	return -1;
	184	}
	185	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	186	if (count < 0) {
	187	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	188	free(buf);
	189	}
	190	if (rpc_process_pdu(rpc, buf, count) != 0) {
	191	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	192	free(buf);
	193	return -1;
	194	}
	195	free(buf);
	196	return 0;
	197	}
	198
cdb19ec1 RS	199	/* read record marker, 4 bytes at the beginning of every pdu */
	200	if (rpc->inbuf == NULL) {
	201	rpc->insize = 4;
	202	rpc->inbuf = malloc(rpc->insize);
	203	if (rpc->inbuf == NULL) {
	204	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	205	return -1;
	206	}
	207	}
	208	if (rpc->inpos < 4) {
	209	size = 4 - rpc->inpos;
	210
6874f61e	211	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
cdb19ec1 RS	212	if (count == -1) {
	213	if (errno == EINTR) {
	214	return 0;
	215	}
	216	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	217	return -1;
	218	}
	219	available -= count;
	220	rpc->inpos += count;
	221	}
	222
	223	if (available == 0) {
	224	return 0;
	225	}
	226
	227	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	228	if (rpc->insize < pdu_size) {
	229	unsigned char *buf;
	230
	231	buf = malloc(pdu_size);
	232	if (buf == NULL) {
	233	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	234	return -1;
	235	}
	236	memcpy(buf, rpc->inbuf, rpc->insize);
	237	free(rpc->inbuf);
	238	rpc->inbuf = buf;
	239	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	240	}
cdb19ec1 RS	241
	242	size = available;
	243	if (size > rpc->insize - rpc->inpos) {
	244	size = rpc->insize - rpc->inpos;
84004dbf RS	245	}
84004dbf RS	246
6874f61e	247	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
84004dbf RS	248	if (count == -1) {
84004dbf RS	249	if (errno == EINTR) {
84004dbf RS	250	return 0;
	251	}
	252	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	253	return -1;
84004dbf	254	}
cdb19ec1 RS	255	available -= count;
cdb19ec1 RS	256	rpc->inpos += count;
84004dbf	257
cdb19ec1 RS	258	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	259	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	260	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	261	return -1;
84004dbf	262	}
cdb19ec1 RS	263	free(rpc->inbuf);
	264	rpc->inbuf = NULL;
	265	rpc->insize = 0;
	266	rpc->inpos = 0;
84004dbf	267	}
cdb19ec1	268
84004dbf RS	269	return 0;
	270	}
	271
	272
	273
	274	int rpc_service(struct rpc_context *rpc, int revents)
	275	{
4a2b0876 RS	276	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	277
84004dbf	278	if (revents & POLLERR) {
fcc42bfe	279	#ifdef WIN32
a8a1b858	280	char err = 0;
fcc42bfe M	281	#else
	282	int err = 0;
	283	#endif
912f7ad5 RS	284	socklen_t err_size = sizeof(err);
	285
	286	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	287	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	288	if (err == 0) {
	289	err = errno;
	290	}
	291	rpc_set_error(rpc, "rpc_service: socket error "
	292	"%s(%d).",
	293	strerror(err), err);
84004dbf	294	} else {
912f7ad5 RS	295	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	296	"Unknown socket error.");
84004dbf	297	}
b990de23 RS	298	if (rpc->connect_cb != NULL) {
	299	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	300	}
84004dbf RS	301	return -1;
	302	}
	303	if (revents & POLLHUP) {
84004dbf	304	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	305	if (rpc->connect_cb != NULL) {
	306	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	307	}
1896d37b	308	return -1;
84004dbf RS	309	}
	310
	311	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	312	int err = 0;
	313	socklen_t err_size = sizeof(err);
	314
	315	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	316	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	317	if (err == 0) {
	318	err = errno;
	319	}
	320	rpc_set_error(rpc, "rpc_service: socket error "
	321	"%s(%d) while connecting.",
	322	strerror(err), err);
b990de23 RS	323	if (rpc->connect_cb != NULL) {
b990de23 RS	324	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	325	NULL, rpc->connect_data);
b990de23	326	}
912f7ad5 RS	327	return -1;
	328	}
	329
84004dbf	330	rpc->is_connected = 1;
b990de23 RS	331	if (rpc->connect_cb != NULL) {
	332	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	333	}
84004dbf RS	334	return 0;
	335	}
	336
b077fdeb RS	337	if (revents & POLLIN) {
b077fdeb RS	338	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	339	rpc_reconnect_requeue(rpc);
b077fdeb	340	return 0;
84004dbf RS	341	}
	342	}
	343
b077fdeb RS	344	if (revents & POLLOUT && rpc->outqueue != NULL) {
	345	if (rpc_write_to_socket(rpc) != 0) {
	346	rpc_set_error(rpc, "write to socket failed");
1896d37b	347	return -1;
84004dbf RS	348	}
	349	}
	350
	351	return 0;
	352	}
	353
1744ef90	354	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	355	{
4a2b0876 RS	356	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	357
1744ef90 RS	358	rpc->auto_reconnect = 1;
1744ef90 RS	359	}
84004dbf	360
1744ef90 RS	361	void rpc_unset_autoreconnect(struct rpc_context *rpc)
1744ef90 RS	362	{
4a2b0876 RS	363	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	364
1744ef90 RS	365	rpc->auto_reconnect = 0;
1744ef90 RS	366	}
070287e5	367
1744ef90 RS	368	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	369	{
	370	int socksize;
84004dbf	371
4a2b0876 RS	372	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	373
1744ef90	374	switch (s->ss_family) {
84004dbf	375	case AF_INET:
84004dbf	376	socksize = sizeof(struct sockaddr_in);
6874f61e	377	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	378	break;
1744ef90 RS	379	default:
	380	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	381	return -1;
84004dbf RS	382	}
	383
	384	if (rpc->fd == -1) {
	385	rpc_set_error(rpc, "Failed to open socket");
1896d37b	386	return -1;
84004dbf RS	387	}
84004dbf RS	388
07fd0cbc RS	389	/* Some systems allow you to set capabilities on an executable
	390	* to allow the file to be executed with privilege to bind to
	391	* privileged system ports, even if the user is not root.
	392	*
	393	* Opportunistically try to bind the socket to a low numbered
	394	* system port in the hope that the user is either root or the
	395	* executable has the CAP_NET_BIND_SERVICE.
	396	*
	397	* As soon as we fail the bind() with EACCES we know we will never
	398	* be able to bind to a system port so we terminate the loop.
	399	*
	400	* On linux, use
	401	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	402	* to make the executable able to bind to a system port.
ac559609 RI	403	*
	404	* On Windows, there is no concept of privileged ports. Thus
	405	* binding will usually succeed.
07fd0cbc	406	*/
ac559609 RI	407	{
	408	struct sockaddr_in sin;
	409	static int portOfs = 0;
	410	const int firstPort = 512; /* >= 512 according to Sun docs */
	411	const int portCount = IPPORT_RESERVED - firstPort;
cb5b8be2	412	int startOfs, port, rc;
ac559609	413
cb5b8be2 RS	414	if (portOfs == 0) {
	415	portOfs = time(NULL) % 400;
	416	}
	417	startOfs = portOfs;
ac559609 RI	418	do {
	419	rc = -1;
	420	port = htons(firstPort + portOfs);
	421	portOfs = (portOfs + 1) % portCount;
	422
	423	/* skip well-known ports */
	424	if (!getservbyport(port, "tcp")) {
	425	memset(&sin, 0, sizeof(sin));
	426	sin.sin_port = port;
	427	sin.sin_family = AF_INET;
	428	sin.sin_addr.s_addr = 0;
	429
	430	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	431	#if !defined(WIN32)
	432	/* we got EACCES, so don't try again */
	433	if (rc != 0 && errno == EACCES)
	434	break;
	435	#endif
07fd0cbc	436	}
ac559609	437	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	438	}
07fd0cbc	439
84004dbf	440	set_nonblocking(rpc->fd);
07fd0cbc	441
f96b24fa RI	442	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	443	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	444	return -1;
84004dbf RS	445	}
	446
	447	return 0;
	448	}
	449
1744ef90 RS	450	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	451	{
	452	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	453
4a2b0876 RS	454	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	455
1744ef90 RS	456	if (rpc->fd != -1) {
	457	rpc_set_error(rpc, "Trying to connect while already connected");
	458	return -1;
	459	}
	460
	461	if (rpc->is_udp != 0) {
	462	rpc_set_error(rpc, "Trying to connect on UDP socket");
	463	return -1;
	464	}
	465
	466	rpc->auto_reconnect = 0;
	467
	468	sin->sin_family = AF_INET;
	469	sin->sin_port = htons(port);
	470	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	471	rpc_set_error(rpc, "Not a valid server ip address");
	472	return -1;
	473	}
	474
	475
	476	switch (rpc->s.ss_family) {
	477	case AF_INET:
	478	#ifdef HAVE_SOCKADDR_LEN
	479	sin->sin_len = sizeof(struct sockaddr_in);
	480	#endif
	481	break;
	482	}
	483
	484	rpc->connect_cb = cb;
	485	rpc->connect_data = private_data;
	486
	487	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	488	return -1;
	489	}
	490
	491	return 0;
	492	}
	493
84004dbf RS	494	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	495	{
4a2b0876 RS	496	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	497
1744ef90 RS	498	rpc_unset_autoreconnect(rpc);
1744ef90 RS	499
84004dbf RS	500	if (rpc->fd != -1) {
	501	close(rpc->fd);
	502	}
	503	rpc->fd = -1;
	504
	505	rpc->is_connected = 0;
	506
	507	rpc_error_all_pdus(rpc, error);
	508
	509	return 0;
	510	}
485bc9b9	511
1744ef90 RS	512	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
1744ef90 RS	513	{
4a2b0876 RS	514	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	515
1744ef90 RS	516	if (status != RPC_STATUS_SUCCESS) {
	517	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	518	return;
	519	}
	520
	521	rpc->is_connected = 1;
b990de23	522	rpc->connect_cb = NULL;
1744ef90 RS	523	}
	524
	525	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	526	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	527	{
	528	struct rpc_pdu *pdu;
	529
4a2b0876 RS	530	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	531
b077fdeb RS	532	if (rpc->fd != -1) {
	533	close(rpc->fd);
	534	}
	535	rpc->fd = -1;
	536
	537	rpc->is_connected = 0;
	538
	539	/* socket is closed so we will not get any replies to any commands
	540	* in flight. Move them all over from the waitpdu queue back to the out queue
	541	*/
	542	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	543	SLIST_REMOVE(&rpc->waitpdu, pdu);
	544	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	545	/* we have to re-send the whole pdu again */
	546	pdu->written = 0;
	547	}
	548
	549	if (rpc->auto_reconnect != 0) {
	550	rpc->connect_cb = reconnect_cb;
	551
	552	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	553	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	554	return -1;
	555	}
b077fdeb RS	556	}
	557
	558	return 0;
	559	}
	560
485bc9b9 RS	561
	562	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	563	{
	564	struct addrinfo *ai = NULL;
	565	char service[6];
	566
4a2b0876 RS	567	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	568
485bc9b9 RS	569	if (rpc->is_udp == 0) {
	570	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	571	return -1;
	572	}
	573
6874f61e	574	sprintf(service, "%d", port);
485bc9b9 RS	575	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	576	rpc_set_error(rpc, "Invalid address:%s. "
	577	"Can not resolv into IPv4/v6 structure.");
	578	return -1;
	579	}
	580
	581	switch(ai->ai_family) {
	582	case AF_INET:
	583	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	584	if (rpc->fd == -1) {
	585	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	586	freeaddrinfo(ai);
	587	return -1;
	588	}
	589
	590	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	591	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	592	freeaddrinfo(ai);
	593	return -1;
	594	}
	595	break;
	596	default:
	597	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	598	freeaddrinfo(ai);
	599	return -1;
	600	}
	601
	602	freeaddrinfo(ai);
	603
	604	return 0;
	605	}
	606
5bf60dc6 RS	607	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	608	{
	609	struct addrinfo *ai = NULL;
	610	char service[6];
	611
4a2b0876 RS	612	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	613
5bf60dc6 RS	614	if (rpc->is_udp == 0) {
	615	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	616	return -1;
	617	}
	618
6874f61e	619	sprintf(service, "%d", port);
5bf60dc6 RS	620	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	621	rpc_set_error(rpc, "Invalid address:%s. "
	622	"Can not resolv into IPv4/v6 structure.");
	623	return -1;
	624	}
	625
	626	if (rpc->udp_dest) {
	627	free(rpc->udp_dest);
	628	rpc->udp_dest = NULL;
	629	}
	630	rpc->udp_dest = malloc(ai->ai_addrlen);
	631	if (rpc->udp_dest == NULL) {
	632	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	633	freeaddrinfo(ai);
5bf60dc6 RS	634	return -1;
	635	}
	636	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	637	freeaddrinfo(ai);
	638
	639	rpc->is_broadcast = is_broadcast;
bb4e9ed6	640	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	641
	642	return 0;
	643	}
c481da67 RS	644
	645	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	646	{
4a2b0876 RS	647	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	648
c481da67 RS	649	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	650	}
83aa785d RS	651
	652	int rpc_queue_length(struct rpc_context *rpc)
	653	{
	654	int i=0;
	655	struct rpc_pdu *pdu;
	656
4a2b0876 RS	657	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	658
83aa785d RS	659	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	660	i++;
	661	}
	662	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	663	i++;
	664	}
	665	return i;
	666	}