[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"
#define ioctl ioctlsocket
#define close closesocket
#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 = 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 = 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) {
		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	*/
a8a1b858 M	17	#ifdef WIN32
a8a1b858 M	18	#include "win32_compat.h"
622489d3 RS	19	#define ioctl ioctlsocket
622489d3 RS	20	#define close closesocket
a8a1b858 M	21	#else
a8a1b858 M	22	#include <unistd.h>
a8a1b858 M	23	#include <arpa/inet.h>
	24	#include <sys/ioctl.h>
	25	#include <sys/socket.h>
	26	#include <netdb.h>
	27	#endif/WIN32/
84004dbf	28
fc01d2a9 TN	29	#ifdef HAVE_CONFIG_H
	30	#include "config.h"
	31	#endif
d7c6e9aa RS	32
	33	#ifdef AROS
	34	#include "aros_compat.h"
	35	#endif
	36
	37	#ifdef HAVE_POLL_H
	38	#include <poll.h>
	39	#endif
	40
84004dbf	41	#include <stdio.h>
98f5fee8	42	#include <stdlib.h>
4a2b0876	43	#include <assert.h>
84004dbf	44	#include <fcntl.h>
84004dbf RS	45	#include <string.h>
84004dbf RS	46	#include <errno.h>
fc01d2a9 TN	47	#ifdef HAVE_SYS_FILIO_H
	48	#include <sys/filio.h>
	49	#endif
647d2ea1 RS	50	#ifdef HAVE_SYS_SOCKIO_H
	51	#include <sys/sockio.h>
	52	#endif
485bc9b9	53	#include <sys/types.h>
763cd6e3	54	#include "libnfs-zdr.h"
84004dbf RS	55	#include "libnfs.h"
	56	#include "libnfs-raw.h"
	57	#include "libnfs-private.h"
	58	#include "slist.h"
	59
fcc42bfe M	60	#ifdef WIN32
	61	//has to be included after stdlib!!
	62	#include "win32_errnowrapper.h"
	63	#endif
	64
	65
1744ef90 RS	66	static int rpc_reconnect_requeue(struct rpc_context *rpc);
1744ef90 RS	67	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s);
b077fdeb	68
84004dbf RS	69	static void set_nonblocking(int fd)
84004dbf RS	70	{
99c14c9b	71	int v = 0;
6874f61e	72	#if defined(WIN32)
99c14c9b	73	long nonblocking=1;
622489d3	74	v = ioctl(fd, FIONBIO, &nonblocking);
6874f61e	75	#else
84004dbf RS	76	v = fcntl(fd, F_GETFL, 0);
84004dbf RS	77	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
a8a1b858	78	#endif //FIXME
84004dbf RS	79	}
	80
	81	int rpc_get_fd(struct rpc_context *rpc)
	82	{
4a2b0876 RS	83	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	84
84004dbf RS	85	return rpc->fd;
	86	}
	87
	88	int rpc_which_events(struct rpc_context *rpc)
	89	{
4a2b0876 RS	90	int events;
	91
	92	assert(rpc->magic == RPC_CONTEXT_MAGIC);
	93
	94	events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	95
5911f3e8 RS	96	if (rpc->is_udp != 0) {
	97	/* for udp sockets we only wait for pollin */
	98	return POLLIN;
	99	}
	100
84004dbf RS	101	if (rpc->outqueue) {
	102	events \|= POLLOUT;
	103	}
	104	return events;
	105	}
	106
	107	static int rpc_write_to_socket(struct rpc_context *rpc)
	108	{
d14e2838	109	int32_t count;
84004dbf	110
4a2b0876 RS	111	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	112
84004dbf	113	if (rpc->fd == -1) {
1896d37b RS	114	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	115	return -1;
84004dbf RS	116	}
	117
	118	while (rpc->outqueue != NULL) {
183451cf	119	int64_t total;
84004dbf RS	120
	121	total = rpc->outqueue->outdata.size;
	122
6874f61e	123	count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
84004dbf RS	124	if (count == -1) {
84004dbf RS	125	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	126	return 0;
84004dbf RS	127	}
1896d37b RS	128	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	129	return -1;
84004dbf RS	130	}
	131
	132	rpc->outqueue->written += count;
	133	if (rpc->outqueue->written == total) {
	134	struct rpc_pdu *pdu = rpc->outqueue;
	135
	136	SLIST_REMOVE(&rpc->outqueue, pdu);
	137	SLIST_ADD_END(&rpc->waitpdu, pdu);
	138	}
	139	}
	140	return 0;
	141	}
	142
	143	static int rpc_read_from_socket(struct rpc_context *rpc)
	144	{
	145	int available;
	146	int size;
cdb19ec1	147	int pdu_size;
d14e2838	148	int32_t count;
84004dbf	149
f3a75078	150	assert(rpc->magic == RPC_CONTEXT_MAGIC);
84004dbf	151
4a2b0876 RS	152	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	153
84004dbf RS	154	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	155	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	156	return -1;
	157	}
a8a1b858	158
84004dbf RS	159	if (available == 0) {
84004dbf RS	160	rpc_set_error(rpc, "Socket has been closed");
1896d37b	161	return -1;
84004dbf	162	}
cdb19ec1	163
0268794f RS	164	if (rpc->is_udp) {
	165	char *buf;
	166	socklen_t socklen = sizeof(rpc->udp_src);
	167
	168	buf = malloc(available);
	169	if (buf == NULL) {
	170	rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
	171	return -1;
	172	}
	173	count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
	174	if (count < 0) {
	175	rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
	176	free(buf);
	177	}
	178	if (rpc_process_pdu(rpc, buf, count) != 0) {
	179	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
	180	free(buf);
	181	return -1;
	182	}
	183	free(buf);
	184	return 0;
	185	}
	186
cdb19ec1 RS	187	/* read record marker, 4 bytes at the beginning of every pdu */
	188	if (rpc->inbuf == NULL) {
	189	rpc->insize = 4;
	190	rpc->inbuf = malloc(rpc->insize);
	191	if (rpc->inbuf == NULL) {
	192	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	193	return -1;
	194	}
	195	}
	196	if (rpc->inpos < 4) {
	197	size = 4 - rpc->inpos;
	198
6874f61e	199	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
cdb19ec1 RS	200	if (count == -1) {
	201	if (errno == EINTR) {
	202	return 0;
	203	}
	204	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	205	return -1;
	206	}
	207	available -= count;
	208	rpc->inpos += count;
	209	}
	210
	211	if (available == 0) {
	212	return 0;
	213	}
	214
	215	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	216	if (rpc->insize < pdu_size) {
	217	unsigned char *buf;
	218
	219	buf = malloc(pdu_size);
	220	if (buf == NULL) {
	221	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	222	return -1;
	223	}
	224	memcpy(buf, rpc->inbuf, rpc->insize);
	225	free(rpc->inbuf);
	226	rpc->inbuf = buf;
	227	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	228	}
cdb19ec1 RS	229
	230	size = available;
	231	if (size > rpc->insize - rpc->inpos) {
	232	size = rpc->insize - rpc->inpos;
84004dbf RS	233	}
84004dbf RS	234
6874f61e	235	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
84004dbf RS	236	if (count == -1) {
84004dbf RS	237	if (errno == EINTR) {
84004dbf RS	238	return 0;
	239	}
	240	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	241	return -1;
84004dbf	242	}
cdb19ec1 RS	243	available -= count;
cdb19ec1 RS	244	rpc->inpos += count;
84004dbf	245
cdb19ec1 RS	246	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	247	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	248	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	249	return -1;
84004dbf	250	}
cdb19ec1 RS	251	free(rpc->inbuf);
	252	rpc->inbuf = NULL;
	253	rpc->insize = 0;
	254	rpc->inpos = 0;
84004dbf	255	}
cdb19ec1	256
84004dbf RS	257	return 0;
	258	}
	259
	260
	261
	262	int rpc_service(struct rpc_context *rpc, int revents)
	263	{
4a2b0876 RS	264	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	265
84004dbf	266	if (revents & POLLERR) {
fcc42bfe	267	#ifdef WIN32
a8a1b858	268	char err = 0;
fcc42bfe M	269	#else
	270	int err = 0;
	271	#endif
912f7ad5 RS	272	socklen_t err_size = sizeof(err);
	273
	274	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	275	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	276	if (err == 0) {
	277	err = errno;
	278	}
	279	rpc_set_error(rpc, "rpc_service: socket error "
	280	"%s(%d).",
	281	strerror(err), err);
84004dbf	282	} else {
912f7ad5 RS	283	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	284	"Unknown socket error.");
84004dbf	285	}
b990de23 RS	286	if (rpc->connect_cb != NULL) {
	287	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	288	}
84004dbf RS	289	return -1;
	290	}
	291	if (revents & POLLHUP) {
84004dbf	292	rpc_set_error(rpc, "Socket failed with POLLHUP");
b990de23 RS	293	if (rpc->connect_cb != NULL) {
	294	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	295	}
1896d37b	296	return -1;
84004dbf RS	297	}
	298
	299	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	300	int err = 0;
	301	socklen_t err_size = sizeof(err);
	302
	303	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
bb4e9ed6	304	(char *)&err, &err_size) != 0 \|\| err != 0) {
912f7ad5 RS	305	if (err == 0) {
	306	err = errno;
	307	}
	308	rpc_set_error(rpc, "rpc_service: socket error "
	309	"%s(%d) while connecting.",
	310	strerror(err), err);
b990de23 RS	311	if (rpc->connect_cb != NULL) {
b990de23 RS	312	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
912f7ad5	313	NULL, rpc->connect_data);
b990de23	314	}
912f7ad5 RS	315	return -1;
	316	}
	317
84004dbf	318	rpc->is_connected = 1;
b990de23 RS	319	if (rpc->connect_cb != NULL) {
	320	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	321	}
84004dbf RS	322	return 0;
	323	}
	324
b077fdeb RS	325	if (revents & POLLIN) {
b077fdeb RS	326	if (rpc_read_from_socket(rpc) != 0) {
1744ef90	327	rpc_reconnect_requeue(rpc);
b077fdeb	328	return 0;
84004dbf RS	329	}
	330	}
	331
b077fdeb RS	332	if (revents & POLLOUT && rpc->outqueue != NULL) {
	333	if (rpc_write_to_socket(rpc) != 0) {
	334	rpc_set_error(rpc, "write to socket failed");
1896d37b	335	return -1;
84004dbf RS	336	}
	337	}
	338
	339	return 0;
	340	}
	341
1744ef90	342	void rpc_set_autoreconnect(struct rpc_context *rpc)
84004dbf	343	{
4a2b0876 RS	344	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	345
1744ef90 RS	346	rpc->auto_reconnect = 1;
1744ef90 RS	347	}
84004dbf	348
1744ef90 RS	349	void rpc_unset_autoreconnect(struct rpc_context *rpc)
1744ef90 RS	350	{
4a2b0876 RS	351	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	352
1744ef90 RS	353	rpc->auto_reconnect = 0;
1744ef90 RS	354	}
070287e5	355
1744ef90 RS	356	static int rpc_connect_sockaddr_async(struct rpc_context rpc, struct sockaddr_storage s)
	357	{
	358	int socksize;
84004dbf	359
4a2b0876 RS	360	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	361
1744ef90	362	switch (s->ss_family) {
84004dbf	363	case AF_INET:
84004dbf	364	socksize = sizeof(struct sockaddr_in);
6874f61e	365	rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
84004dbf	366	break;
1744ef90 RS	367	default:
	368	rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
	369	return -1;
84004dbf RS	370	}
	371
	372	if (rpc->fd == -1) {
	373	rpc_set_error(rpc, "Failed to open socket");
1896d37b	374	return -1;
84004dbf RS	375	}
84004dbf RS	376
07fd0cbc RS	377	/* Some systems allow you to set capabilities on an executable
	378	* to allow the file to be executed with privilege to bind to
	379	* privileged system ports, even if the user is not root.
	380	*
	381	* Opportunistically try to bind the socket to a low numbered
	382	* system port in the hope that the user is either root or the
	383	* executable has the CAP_NET_BIND_SERVICE.
	384	*
	385	* As soon as we fail the bind() with EACCES we know we will never
	386	* be able to bind to a system port so we terminate the loop.
	387	*
	388	* On linux, use
	389	* sudo setcap 'cap_net_bind_service=+ep' /path/executable
	390	* to make the executable able to bind to a system port.
ac559609 RI	391	*
	392	* On Windows, there is no concept of privileged ports. Thus
	393	* binding will usually succeed.
07fd0cbc	394	*/
ac559609 RI	395	{
	396	struct sockaddr_in sin;
	397	static int portOfs = 0;
	398	const int firstPort = 512; /* >= 512 according to Sun docs */
	399	const int portCount = IPPORT_RESERVED - firstPort;
	400	int startOfs = portOfs, port, rc;
	401
	402	do {
	403	rc = -1;
	404	port = htons(firstPort + portOfs);
	405	portOfs = (portOfs + 1) % portCount;
	406
	407	/* skip well-known ports */
	408	if (!getservbyport(port, "tcp")) {
	409	memset(&sin, 0, sizeof(sin));
	410	sin.sin_port = port;
	411	sin.sin_family = AF_INET;
	412	sin.sin_addr.s_addr = 0;
	413
	414	rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
	415	#if !defined(WIN32)
	416	/* we got EACCES, so don't try again */
	417	if (rc != 0 && errno == EACCES)
	418	break;
	419	#endif
07fd0cbc	420	}
ac559609	421	} while (rc != 0 && portOfs != startOfs);
07fd0cbc	422	}
07fd0cbc	423
84004dbf	424	set_nonblocking(rpc->fd);
07fd0cbc	425
f96b24fa RI	426	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
f96b24fa RI	427	rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
1896d37b	428	return -1;
84004dbf RS	429	}
	430
	431	return 0;
	432	}
	433
1744ef90 RS	434	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	435	{
	436	struct sockaddr_in sin = (struct sockaddr_in )&rpc->s;
	437
4a2b0876 RS	438	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	439
1744ef90 RS	440	if (rpc->fd != -1) {
	441	rpc_set_error(rpc, "Trying to connect while already connected");
	442	return -1;
	443	}
	444
	445	if (rpc->is_udp != 0) {
	446	rpc_set_error(rpc, "Trying to connect on UDP socket");
	447	return -1;
	448	}
	449
	450	rpc->auto_reconnect = 0;
	451
	452	sin->sin_family = AF_INET;
	453	sin->sin_port = htons(port);
	454	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	455	rpc_set_error(rpc, "Not a valid server ip address");
	456	return -1;
	457	}
	458
	459
	460	switch (rpc->s.ss_family) {
	461	case AF_INET:
	462	#ifdef HAVE_SOCKADDR_LEN
	463	sin->sin_len = sizeof(struct sockaddr_in);
	464	#endif
	465	break;
	466	}
	467
	468	rpc->connect_cb = cb;
	469	rpc->connect_data = private_data;
	470
	471	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	472	return -1;
	473	}
	474
	475	return 0;
	476	}
	477
84004dbf RS	478	int rpc_disconnect(struct rpc_context rpc, char error)
84004dbf RS	479	{
4a2b0876 RS	480	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	481
1744ef90 RS	482	rpc_unset_autoreconnect(rpc);
1744ef90 RS	483
84004dbf RS	484	if (rpc->fd != -1) {
	485	close(rpc->fd);
	486	}
	487	rpc->fd = -1;
	488
	489	rpc->is_connected = 0;
	490
	491	rpc_error_all_pdus(rpc, error);
	492
	493	return 0;
	494	}
485bc9b9	495
1744ef90 RS	496	static void reconnect_cb(struct rpc_context rpc, int status, void data _U_, void *private_data)
1744ef90 RS	497	{
4a2b0876 RS	498	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	499
1744ef90 RS	500	if (status != RPC_STATUS_SUCCESS) {
	501	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	502	return;
	503	}
	504
	505	rpc->is_connected = 1;
b990de23	506	rpc->connect_cb = NULL;
1744ef90 RS	507	}
	508
	509	/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
	510	static int rpc_reconnect_requeue(struct rpc_context *rpc)
b077fdeb RS	511	{
	512	struct rpc_pdu *pdu;
	513
4a2b0876 RS	514	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	515
b077fdeb RS	516	if (rpc->fd != -1) {
	517	close(rpc->fd);
	518	}
	519	rpc->fd = -1;
	520
	521	rpc->is_connected = 0;
	522
	523	/* socket is closed so we will not get any replies to any commands
	524	* in flight. Move them all over from the waitpdu queue back to the out queue
	525	*/
	526	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
	527	SLIST_REMOVE(&rpc->waitpdu, pdu);
	528	SLIST_ADD(&rpc->outqueue, pdu);
1744ef90 RS	529	/* we have to re-send the whole pdu again */
	530	pdu->written = 0;
	531	}
	532
	533	if (rpc->auto_reconnect != 0) {
	534	rpc->connect_cb = reconnect_cb;
	535
	536	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
	537	rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
	538	return -1;
	539	}
b077fdeb RS	540	}
	541
	542	return 0;
	543	}
	544
485bc9b9 RS	545
	546	int rpc_bind_udp(struct rpc_context rpc, char addr, int port)
	547	{
	548	struct addrinfo *ai = NULL;
	549	char service[6];
	550
4a2b0876 RS	551	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	552
485bc9b9 RS	553	if (rpc->is_udp == 0) {
	554	rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
	555	return -1;
	556	}
	557
6874f61e	558	sprintf(service, "%d", port);
485bc9b9 RS	559	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	560	rpc_set_error(rpc, "Invalid address:%s. "
	561	"Can not resolv into IPv4/v6 structure.");
	562	return -1;
	563	}
	564
	565	switch(ai->ai_family) {
	566	case AF_INET:
	567	rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
	568	if (rpc->fd == -1) {
	569	rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
	570	freeaddrinfo(ai);
	571	return -1;
	572	}
	573
	574	if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
	575	rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
	576	freeaddrinfo(ai);
	577	return -1;
	578	}
	579	break;
	580	default:
	581	rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
	582	freeaddrinfo(ai);
	583	return -1;
	584	}
	585
	586	freeaddrinfo(ai);
	587
	588	return 0;
	589	}
	590
5bf60dc6 RS	591	int rpc_set_udp_destination(struct rpc_context rpc, char addr, int port, int is_broadcast)
	592	{
	593	struct addrinfo *ai = NULL;
	594	char service[6];
	595
4a2b0876 RS	596	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	597
5bf60dc6 RS	598	if (rpc->is_udp == 0) {
	599	rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
	600	return -1;
	601	}
	602
6874f61e	603	sprintf(service, "%d", port);
5bf60dc6 RS	604	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
	605	rpc_set_error(rpc, "Invalid address:%s. "
	606	"Can not resolv into IPv4/v6 structure.");
	607	return -1;
	608	}
	609
	610	if (rpc->udp_dest) {
	611	free(rpc->udp_dest);
	612	rpc->udp_dest = NULL;
	613	}
	614	rpc->udp_dest = malloc(ai->ai_addrlen);
	615	if (rpc->udp_dest == NULL) {
	616	rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
be7f5933	617	freeaddrinfo(ai);
5bf60dc6 RS	618	return -1;
	619	}
	620	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
	621	freeaddrinfo(ai);
	622
	623	rpc->is_broadcast = is_broadcast;
bb4e9ed6	624	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
5bf60dc6 RS	625
	626	return 0;
	627	}
c481da67 RS	628
	629	struct sockaddr rpc_get_recv_sockaddr(struct rpc_context rpc)
	630	{
4a2b0876 RS	631	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	632
c481da67 RS	633	return (struct sockaddr *)&rpc->udp_src;
c481da67 RS	634	}
83aa785d RS	635
	636	int rpc_queue_length(struct rpc_context *rpc)
	637	{
	638	int i=0;
	639	struct rpc_pdu *pdu;
	640
4a2b0876 RS	641	assert(rpc->magic == RPC_CONTEXT_MAGIC);
4a2b0876 RS	642
83aa785d RS	643	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
	644	i++;
	645	}
	646	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
	647	i++;
	648	}
	649	return i;
	650	}