[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;

		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 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;

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