[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"
#endif

#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#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
a8a1b858 M	26	#include "win32_compat.h"
c022471e RS	27	#endif
	28
	29	#ifdef HAVE_ARPA_INET_H
a8a1b858	30	#include <arpa/inet.h>
c022471e	31	#endif
84004dbf	32
00748f36 RS	33	#ifdef HAVE_POLL_H
00748f36 RS	34	#include <poll.h>
fc01d2a9	35	#endif
d7c6e9aa	36
00748f36 RS	37	#ifdef HAVE_UNISTD_H
00748f36 RS	38	#include <unistd.h>
d7c6e9aa RS	39	#endif
d7c6e9aa RS	40
00748f36 RS	41	#ifdef HAVE_SYS_IOCTL_H
00748f36 RS	42	#include <sys/ioctl.h>
d7c6e9aa RS	43	#endif
d7c6e9aa RS	44
7057e733 RS	45	#ifdef HAVE_SYS_SOCKET_H
	46	#include <sys/socket.h>
	47	#endif
	48
bff8fe46 RS	49	#ifdef HAVE_NETDB_H
	50	#include <netdb.h>
	51	#endif
	52
fc01d2a9 TN	53	#ifdef HAVE_SYS_FILIO_H
	54	#include <sys/filio.h>
	55	#endif
bff8fe46	56
647d2ea1 RS	57	#ifdef HAVE_SYS_SOCKIO_H
	58	#include <sys/sockio.h>
	59	#endif
bff8fe46 RS	60
	61	#include <stdio.h>
	62	#include <stdlib.h>
	63	#include <assert.h>
	64	#include <fcntl.h>
	65	#include <string.h>
	66	#include <errno.h>
485bc9b9	67	#include <sys/types.h>
763cd6e3	68	#include "libnfs-zdr.h"
84004dbf RS	69	#include "libnfs.h"
	70	#include "libnfs-raw.h"
	71	#include "libnfs-private.h"
	72	#include "slist.h"
	73
fcc42bfe M	74	#ifdef WIN32
	75	//has to be included after stdlib!!
	76	#include "win32_errnowrapper.h"
	77	#endif
	78
	79
1744ef90 RS	80	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	81	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	82
84004dbf RS	83	static void set_nonblocking(int fd)
84004dbf RS	84	{
99c14c9b	85	int v = 0;
6874f61e	86	#if defined(WIN32)
99c14c9b	87	long nonblocking=1;
622489d3	88	v = ioctl(fd, FIONBIO, &nonblocking);
6874f61e	89	#else
84004dbf RS	90	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	91	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	92	#endif //FIXME
84004dbf RS	93	}
	94
	95	int rpc_get_fd(struct rpc_context *rpc)
	96	{
4a2b0876 RS	97	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	98
84004dbf RS	99	return rpc->fd;
	100	}
	101
	102	int rpc_which_events(struct rpc_context *rpc)
	103	{
4a2b0876 RS	104	int events;
	105
	106	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	107
	108	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	109
5911f3e8 RS	110	if (rpc->is_udp != 0) {
	111	/* for udp sockets we only wait for pollin */
	112	return POLLIN;
	113	}
	114
84004dbf RS	115	if (rpc->outqueue) {
	116	events \|= POLLOUT;
	117	}
	118	return events;
	119	}
	120
	121	static int rpc_write_to_socket(struct rpc_context *rpc)
	122	{
d14e2838	123	int32_t count;
84004dbf	124
4a2b0876 RS	125	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	126
84004dbf	127	if (rpc->fd == -1) {
1896d37b RS	128	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	129	return -1;
84004dbf RS	130	}
	131
	132	while (rpc->outqueue != NULL) {
183451cf	133	int64_t total;
84004dbf RS	134
	135	total = rpc->outqueue->outdata.size;
	136
6874f61e	137	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
84004dbf RS	138	if (count == -1) {
84004dbf RS	139	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	140	return 0;
84004dbf RS	141	}
1896d37b RS	142	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	143	return -1;
84004dbf RS	144	}
	145
	146	rpc->outqueue->written += count;
	147	if (rpc->outqueue->written == total) {
	148	struct rpc_pdu *pdu = rpc->outqueue;
	149
	150	SLIST_REMOVE(&rpc->outqueue, pdu);
	151	SLIST_ADD_END(&rpc->waitpdu, pdu);
	152	}
	153	}
	154	return 0;
	155	}
	156
	157	static int rpc_read_from_socket(struct rpc_context *rpc)
	158	{
	159	int available;
	160	int size;
cdb19ec1	161	int pdu_size;
d14e2838	162	int32_t count;
84004dbf	163
f3a75078	164	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf	165
4a2b0876 RS	166	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	167
84004dbf RS	168	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	169	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	170	return -1;
	171	}
a8a1b858	172
84004dbf RS	173	if (available == 0) {
84004dbf RS	174	rpc_set_error(rpc, "Socket has been closed");
1896d37b	175	return -1;
84004dbf	176	}
cdb19ec1	177
0268794f RS	178	if (rpc->is_udp) {
	179	char *buf;
	180	socklen_t socklen = sizeof(rpc->udp_src);
	181
	182	buf = malloc(available);
	183	if (buf == NULL) {
	184	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	185	return -1;
	186	}
	187	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	188	if (count < 0) {
	189	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	190	free(buf);
	191	}
	192	if (rpc_process_pdu(rpc, buf, count) != 0) {
	193	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	194	free(buf);
	195	return -1;
	196	}
	197	free(buf);
	198	return 0;
	199	}
	200
cdb19ec1 RS	201	/* read record marker, 4 bytes at the beginning of every pdu */
	202	if (rpc->inbuf == NULL) {
	203	rpc->insize = 4;
	204	rpc->inbuf = malloc(rpc->insize);
	205	if (rpc->inbuf == NULL) {
	206	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	207	return -1;
	208	}
	209	}
	210	if (rpc->inpos < 4) {
	211	size = 4 - rpc->inpos;
	212
6874f61e	213	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
cdb19ec1 RS	214	if (count == -1) {
	215	if (errno == EINTR) {
	216	return 0;
	217	}
	218	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	219	return -1;
	220	}
	221	available -= count;
	222	rpc->inpos += count;
	223	}
	224
	225	if (available == 0) {
	226	return 0;
	227	}
	228
	229	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	230	if (rpc->insize < pdu_size) {
	231	unsigned char *buf;
	232
	233	buf = malloc(pdu_size);
	234	if (buf == NULL) {
	235	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	236	return -1;
	237	}
	238	memcpy(buf, rpc->inbuf, rpc->insize);
	239	free(rpc->inbuf);
	240	rpc->inbuf = buf;
	241	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	242	}
cdb19ec1 RS	243
	244	size = available;
	245	if (size > rpc->insize - rpc->inpos) {
	246	size = rpc->insize - rpc->inpos;
84004dbf RS	247	}
84004dbf RS	248
6874f61e	249	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
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;
cb5b8be2	414	int startOfs, port, rc;
ac559609	415
cb5b8be2 RS	416	if (portOfs == 0) {
	417	portOfs = time(NULL) % 400;
	418	}
	419	startOfs = portOfs;
ac559609 RI	420	do {
	421	rc = -1;
	422	port = htons(firstPort + portOfs);
	423	portOfs = (portOfs + 1) % portCount;
	424
	425	/* skip well-known ports */
	426	if (!getservbyport(port, "tcp")) {
	427	memset(&sin, 0, sizeof(sin));
	428	sin.sin_port = port;
	429	sin.sin_family = AF_INET;
	430	sin.sin_addr.s_addr = 0;
	431
	432	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	433	#if !defined(WIN32)
	434	/* we got EACCES, so don't try again */
	435	if (rc != 0 && errno == EACCES)
	436	break;
	437	#endif
07fd0cbc	438	}
ac559609	439	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	440	}
07fd0cbc	441
84004dbf	442	set_nonblocking(rpc->fd);
07fd0cbc	443
f96b24fa RI	444	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	445	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	446	return -1;
84004dbf RS	447	}
	448
	449	return 0;
	450	}
	451
1744ef90 RS	452	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	453	{
	454	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	455
4a2b0876 RS	456	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	457
1744ef90 RS	458	if (rpc->fd != -1) {
	459	rpc_set_error(rpc, "Trying to connect while already connected");
	460	return -1;
	461	}
	462
	463	if (rpc->is_udp != 0) {
	464	rpc_set_error(rpc, "Trying to connect on UDP socket");
	465	return -1;
	466	}
	467
	468	rpc->auto_reconnect = 0;
	469
	470	sin->sin_family = AF_INET;
	471	sin->sin_port = htons(port);
	472	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	473	rpc_set_error(rpc, "Not a valid server ip address");
	474	return -1;
	475	}
	476
	477
	478	switch (rpc->s.ss_family) {
	479	case AF_INET:
	480	#ifdef HAVE_SOCKADDR_LEN
	481	sin->sin_len = sizeof(struct sockaddr_in);
	482	#endif
	483	break;
	484	}
	485
	486	rpc->connect_cb = cb;
	487	rpc->connect_data = private_data;
	488
	489	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	490	return -1;
	491	}
	492
	493	return 0;
	494	}
	495
84004dbf RS	496	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	497	{
4a2b0876 RS	498	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	499
1744ef90 RS	500	rpc_unset_autoreconnect(rpc);
1744ef90 RS	501
84004dbf RS	502	if (rpc->fd != -1) {
	503	close(rpc->fd);
	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 RS	534	if (rpc->fd != -1) {
	535	close(rpc->fd);
	536	}
	537	rpc->fd = -1;
	538
	539	rpc->is_connected = 0;
	540
	541	/* socket is closed so we will not get any replies to any commands
	542	* in flight. Move them all over from the waitpdu queue back to the out queue
	543	*/
	544	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	545	SLIST_REMOVE(&rpc->waitpdu, pdu);
	546	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	547	/* we have to re-send the whole pdu again */
	548	pdu->written = 0;
	549	}
	550
	551	if (rpc->auto_reconnect != 0) {
	552	rpc->connect_cb = reconnect_cb;
	553
	554	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	555	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	556	return -1;
	557	}
b077fdeb RS	558	}
	559
	560	return 0;
	561	}
	562
485bc9b9 RS	563
	564	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	565	{
	566	struct addrinfo *ai = NULL;
	567	char service[6];
	568
4a2b0876 RS	569	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	570
485bc9b9 RS	571	if (rpc->is_udp == 0) {
	572	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	573	return -1;
	574	}
	575
6874f61e	576	sprintf(service, "%d", port);
485bc9b9 RS	577	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	578	rpc_set_error(rpc, "Invalid address:%s. "
	579	"Can not resolv into IPv4/v6 structure.");
	580	return -1;
	581	}
	582
	583	switch(ai->ai_family) {
	584	case AF_INET:
	585	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	586	if (rpc->fd == -1) {
	587	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	588	freeaddrinfo(ai);
	589	return -1;
	590	}
	591
	592	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	593	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	594	freeaddrinfo(ai);
	595	return -1;
	596	}
	597	break;
	598	default:
	599	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	600	freeaddrinfo(ai);
	601	return -1;
	602	}
	603
	604	freeaddrinfo(ai);
	605
	606	return 0;
	607	}
	608
5bf60dc6 RS	609	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	610	{
	611	struct addrinfo *ai = NULL;
	612	char service[6];
	613
4a2b0876 RS	614	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	615
5bf60dc6 RS	616	if (rpc->is_udp == 0) {
	617	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	618	return -1;
	619	}
	620
6874f61e	621	sprintf(service, "%d", port);
5bf60dc6 RS	622	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	623	rpc_set_error(rpc, "Invalid address:%s. "
	624	"Can not resolv into IPv4/v6 structure.");
	625	return -1;
	626	}
	627
	628	if (rpc->udp_dest) {
	629	free(rpc->udp_dest);
	630	rpc->udp_dest = NULL;
	631	}
	632	rpc->udp_dest = malloc(ai->ai_addrlen);
	633	if (rpc->udp_dest == NULL) {
	634	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	635	freeaddrinfo(ai);
5bf60dc6 RS	636	return -1;
	637	}
	638	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	639	freeaddrinfo(ai);
	640
	641	rpc->is_broadcast = is_broadcast;
bb4e9ed6	642	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	643
	644	return 0;
	645	}
c481da67 RS	646
	647	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	648	{
4a2b0876 RS	649	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	650
c481da67 RS	651	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	652	}
83aa785d RS	653
	654	int rpc_queue_length(struct rpc_context *rpc)
	655	{
	656	int i=0;
	657	struct rpc_pdu *pdu;
	658
4a2b0876 RS	659	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	660
83aa785d RS	661	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	662	i++;
	663	}
	664	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	665	i++;
	666	}
	667	return i;
	668	}