[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
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include <string.h>
#include <errno.h>
#include <rpc/rpc.h>
#include <rpc/xdr.h>
#include <arpa/inet.h>
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#include <sys/ioctl.h>
#include "libnfs.h"
#include "libnfs-raw.h"
#include "libnfs-private.h"
#include "slist.h"

static void set_nonblocking(int fd)
{
	unsigned v;
	v = fcntl(fd, F_GETFL, 0);
        fcntl(fd, F_SETFL, v | O_NONBLOCK);
}

int rpc_get_fd(struct rpc_context *rpc)
{
	return rpc->fd;
}

int rpc_which_events(struct rpc_context *rpc)
{
	int events = rpc->is_connected ? POLLIN : POLLOUT;

	if (rpc->outqueue) {
		events |= POLLOUT;
	}
	return events;
}

static int rpc_write_to_socket(struct rpc_context *rpc)
{
	ssize_t count;

	if (rpc == NULL) {
		return -1;
	}
	if (rpc->fd == -1) {
		rpc_set_error(rpc, "trying to write but not connected");
		return -1;
	}

	while (rpc->outqueue != NULL) {
		ssize_t total;

		total = rpc->outqueue->outdata.size;

		count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
		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;
	ssize_t count;

	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;
	}

	/* 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 = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
		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 = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
	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)
{
	if (revents & POLLERR) {
		int err = 0;
		socklen_t err_size = sizeof(err);

		if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
				&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.");
		}
		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");
		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,
				&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);
			rpc->connect_cb(rpc, RPC_STATUS_ERROR,
					NULL, rpc->connect_data);
			return -1;
		}

		rpc->is_connected = 1;
		rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
		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;
		}
	}

	if (revents & POLLIN) {
		if (rpc_read_from_socket(rpc) != 0) {
			rpc_disconnect(rpc, rpc_get_error(rpc));
			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_storage s;
	struct sockaddr_in *sin = (struct sockaddr_in *)&s;
	int socksize;

	if (rpc->fd != -1) {
		rpc_set_error(rpc, "Trying to connect while already connected");
		return -1;
	}

	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 (s.ss_family) {
	case AF_INET:
		socksize = sizeof(struct sockaddr_in);
#ifdef HAVE_SOCK_SIN_LEN
		sin->sin_len = socksize;
#endif
		rpc->fd = socket(AF_INET, SOCK_STREAM, 0);
		break;
	}

	if (rpc->fd == -1) {
		rpc_set_error(rpc, "Failed to open socket");
		return -1;
	}

	rpc->connect_cb  = cb;
	rpc->connect_data = private_data;

	set_nonblocking(rpc->fd);

	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
		rpc_set_error(rpc, "connect() to server failed");
		return -1;
	}		

	return 0;
}	    

int rpc_disconnect(struct rpc_context *rpc, char *error)
{
	if (rpc->fd != -1) {
		close(rpc->fd);
	}
	rpc->fd  = -1;

	rpc->is_connected = 0;

	rpc_error_all_pdus(rpc, error);

	return 0;
}
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	*/
	17
fc01d2a9 TN	18	#ifdef HAVE_CONFIG_H
	19	#include "config.h"
	20	#endif
84004dbf	21	#include <stdio.h>
98f5fee8	22	#include <stdlib.h>
84004dbf RS	23	#include <unistd.h>
	24	#include <fcntl.h>
	25	#include <poll.h>
	26	#include <string.h>
	27	#include <errno.h>
98f5fee8	28	#include <rpc/rpc.h>
84004dbf RS	29	#include <rpc/xdr.h>
84004dbf RS	30	#include <arpa/inet.h>
fc01d2a9 TN	31	#ifdef HAVE_SYS_FILIO_H
	32	#include <sys/filio.h>
	33	#endif
84004dbf RS	34	#include <sys/ioctl.h>
	35	#include "libnfs.h"
	36	#include "libnfs-raw.h"
	37	#include "libnfs-private.h"
	38	#include "slist.h"
	39
	40	static void set_nonblocking(int fd)
	41	{
	42	unsigned v;
	43	v = fcntl(fd, F_GETFL, 0);
	44	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
	45	}
	46
	47	int rpc_get_fd(struct rpc_context *rpc)
	48	{
	49	return rpc->fd;
	50	}
	51
	52	int rpc_which_events(struct rpc_context *rpc)
	53	{
912f7ad5	54	int events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf RS	55
	56	if (rpc->outqueue) {
	57	events \|= POLLOUT;
	58	}
	59	return events;
	60	}
	61
	62	static int rpc_write_to_socket(struct rpc_context *rpc)
	63	{
	64	ssize_t count;
	65
	66	if (rpc == NULL) {
84004dbf RS	67	return -1;
	68	}
	69	if (rpc->fd == -1) {
1896d37b RS	70	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	71	return -1;
84004dbf RS	72	}
	73
	74	while (rpc->outqueue != NULL) {
	75	ssize_t total;
	76
	77	total = rpc->outqueue->outdata.size;
	78
	79	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
	80	if (count == -1) {
	81	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	82	return 0;
84004dbf RS	83	}
1896d37b RS	84	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	85	return -1;
84004dbf RS	86	}
	87
	88	rpc->outqueue->written += count;
	89	if (rpc->outqueue->written == total) {
	90	struct rpc_pdu *pdu = rpc->outqueue;
	91
	92	SLIST_REMOVE(&rpc->outqueue, pdu);
	93	SLIST_ADD_END(&rpc->waitpdu, pdu);
	94	}
	95	}
	96	return 0;
	97	}
	98
	99	static int rpc_read_from_socket(struct rpc_context *rpc)
	100	{
	101	int available;
	102	int size;
cdb19ec1	103	int pdu_size;
84004dbf RS	104	ssize_t count;
	105
	106	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	107	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	108	return -1;
	109	}
	110	if (available == 0) {
	111	rpc_set_error(rpc, "Socket has been closed");
1896d37b	112	return -1;
84004dbf	113	}
cdb19ec1 RS	114
	115	/* read record marker, 4 bytes at the beginning of every pdu */
	116	if (rpc->inbuf == NULL) {
	117	rpc->insize = 4;
	118	rpc->inbuf = malloc(rpc->insize);
	119	if (rpc->inbuf == NULL) {
	120	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	121	return -1;
	122	}
	123	}
	124	if (rpc->inpos < 4) {
	125	size = 4 - rpc->inpos;
	126
	127	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
	128	if (count == -1) {
	129	if (errno == EINTR) {
	130	return 0;
	131	}
	132	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	133	return -1;
	134	}
	135	available -= count;
	136	rpc->inpos += count;
	137	}
	138
	139	if (available == 0) {
	140	return 0;
	141	}
	142
	143	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	144	if (rpc->insize < pdu_size) {
	145	unsigned char *buf;
	146
	147	buf = malloc(pdu_size);
	148	if (buf == NULL) {
	149	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	150	return -1;
	151	}
	152	memcpy(buf, rpc->inbuf, rpc->insize);
	153	free(rpc->inbuf);
	154	rpc->inbuf = buf;
	155	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	156	}
cdb19ec1 RS	157
	158	size = available;
	159	if (size > rpc->insize - rpc->inpos) {
	160	size = rpc->insize - rpc->inpos;
84004dbf RS	161	}
84004dbf RS	162
cdb19ec1	163	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
84004dbf RS	164	if (count == -1) {
84004dbf RS	165	if (errno == EINTR) {
84004dbf RS	166	return 0;
	167	}
	168	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	169	return -1;
84004dbf	170	}
cdb19ec1 RS	171	available -= count;
cdb19ec1 RS	172	rpc->inpos += count;
84004dbf	173
cdb19ec1 RS	174	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	175	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	176	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	177	return -1;
84004dbf	178	}
cdb19ec1 RS	179	free(rpc->inbuf);
	180	rpc->inbuf = NULL;
	181	rpc->insize = 0;
	182	rpc->inpos = 0;
84004dbf	183	}
cdb19ec1	184
84004dbf RS	185	return 0;
	186	}
	187
	188
	189
	190	int rpc_service(struct rpc_context *rpc, int revents)
	191	{
	192	if (revents & POLLERR) {
912f7ad5 RS	193	int err = 0;
	194	socklen_t err_size = sizeof(err);
	195
	196	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
	197	&err, &err_size) != 0 \|\| err != 0) {
	198	if (err == 0) {
	199	err = errno;
	200	}
	201	rpc_set_error(rpc, "rpc_service: socket error "
	202	"%s(%d).",
	203	strerror(err), err);
84004dbf	204	} else {
912f7ad5 RS	205	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	206	"Unknown socket error.");
84004dbf RS	207	}
	208	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	209	return -1;
	210	}
	211	if (revents & POLLHUP) {
84004dbf RS	212	rpc_set_error(rpc, "Socket failed with POLLHUP");
84004dbf RS	213	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
1896d37b	214	return -1;
84004dbf RS	215	}
	216
	217	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	218	int err = 0;
	219	socklen_t err_size = sizeof(err);
	220
	221	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
	222	&err, &err_size) != 0 \|\| err != 0) {
	223	if (err == 0) {
	224	err = errno;
	225	}
	226	rpc_set_error(rpc, "rpc_service: socket error "
	227	"%s(%d) while connecting.",
	228	strerror(err), err);
	229	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
	230	NULL, rpc->connect_data);
	231	return -1;
	232	}
	233
84004dbf RS	234	rpc->is_connected = 1;
	235	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	236	return 0;
	237	}
	238
	239	if (revents & POLLOUT && rpc->outqueue != NULL) {
	240	if (rpc_write_to_socket(rpc) != 0) {
1896d37b RS	241	rpc_set_error(rpc, "write to socket failed");
1896d37b RS	242	return -1;
84004dbf RS	243	}
	244	}
	245
	246	if (revents & POLLIN) {
	247	if (rpc_read_from_socket(rpc) != 0) {
	248	rpc_disconnect(rpc, rpc_get_error(rpc));
1896d37b	249	return -1;
84004dbf RS	250	}
	251	}
	252
	253	return 0;
	254	}
	255
	256
	257	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	258	{
	259	struct sockaddr_storage s;
	260	struct sockaddr_in sin = (struct sockaddr_in )&s;
	261	int socksize;
	262
	263	if (rpc->fd != -1) {
	264	rpc_set_error(rpc, "Trying to connect while already connected");
84004dbf RS	265	return -1;
	266	}
	267
	268	sin->sin_family = AF_INET;
	269	sin->sin_port = htons(port);
	270	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	271	rpc_set_error(rpc, "Not a valid server ip address");
1896d37b	272	return -1;
84004dbf RS	273	}
	274
	275	switch (s.ss_family) {
	276	case AF_INET:
84004dbf	277	socksize = sizeof(struct sockaddr_in);
ea214e45 RS	278	#ifdef HAVE_SOCK_SIN_LEN
	279	sin->sin_len = socksize;
	280	#endif
	281	rpc->fd = socket(AF_INET, SOCK_STREAM, 0);
84004dbf RS	282	break;
	283	}
	284
	285	if (rpc->fd == -1) {
	286	rpc_set_error(rpc, "Failed to open socket");
1896d37b	287	return -1;
84004dbf RS	288	}
	289
	290	rpc->connect_cb = cb;
	291	rpc->connect_data = private_data;
	292
	293	set_nonblocking(rpc->fd);
	294
	295	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
	296	rpc_set_error(rpc, "connect() to server failed");
1896d37b	297	return -1;
84004dbf RS	298	}
	299
	300	return 0;
	301	}
	302
	303	int rpc_disconnect(struct rpc_context rpc, char error)
	304	{
	305	if (rpc->fd != -1) {
	306	close(rpc->fd);
	307	}
	308	rpc->fd = -1;
	309
	310	rpc->is_connected = 0;
	311
	312	rpc_error_all_pdus(rpc, error);
	313
	314	return 0;
	315	}