[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/>.
*/

#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>
#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->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)
{
	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
	18	#include <stdio.h>
98f5fee8	19	#include <stdlib.h>
84004dbf RS	20	#include <unistd.h>
	21	#include <fcntl.h>
	22	#include <poll.h>
	23	#include <string.h>
	24	#include <errno.h>
98f5fee8	25	#include <rpc/rpc.h>
84004dbf RS	26	#include <rpc/xdr.h>
	27	#include <arpa/inet.h>
	28	#include <sys/ioctl.h>
	29	#include "libnfs.h"
	30	#include "libnfs-raw.h"
	31	#include "libnfs-private.h"
	32	#include "slist.h"
	33
	34	static void set_nonblocking(int fd)
	35	{
	36	unsigned v;
	37	v = fcntl(fd, F_GETFL, 0);
	38	fcntl(fd, F_SETFL, v \| O_NONBLOCK);
	39	}
	40
	41	int rpc_get_fd(struct rpc_context *rpc)
	42	{
	43	return rpc->fd;
	44	}
	45
	46	int rpc_which_events(struct rpc_context *rpc)
	47	{
912f7ad5	48	int events = rpc->is_connected ? POLLIN : POLLOUT;
84004dbf	49
5911f3e8 RS	50	if (rpc->is_udp != 0) {
	51	/* for udp sockets we only wait for pollin */
	52	return POLLIN;
	53	}
	54
84004dbf RS	55	if (rpc->outqueue) {
	56	events \|= POLLOUT;
	57	}
	58	return events;
	59	}
	60
	61	static int rpc_write_to_socket(struct rpc_context *rpc)
	62	{
	63	ssize_t count;
	64
	65	if (rpc == NULL) {
84004dbf RS	66	return -1;
	67	}
	68	if (rpc->fd == -1) {
1896d37b RS	69	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	70	return -1;
84004dbf RS	71	}
	72
	73	while (rpc->outqueue != NULL) {
	74	ssize_t total;
	75
	76	total = rpc->outqueue->outdata.size;
	77
	78	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
	79	if (count == -1) {
	80	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	81	return 0;
84004dbf RS	82	}
1896d37b RS	83	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	84	return -1;
84004dbf RS	85	}
	86
	87	rpc->outqueue->written += count;
	88	if (rpc->outqueue->written == total) {
	89	struct rpc_pdu *pdu = rpc->outqueue;
	90
	91	SLIST_REMOVE(&rpc->outqueue, pdu);
	92	SLIST_ADD_END(&rpc->waitpdu, pdu);
	93	}
	94	}
	95	return 0;
	96	}
	97
	98	static int rpc_read_from_socket(struct rpc_context *rpc)
	99	{
	100	int available;
	101	int size;
cdb19ec1	102	int pdu_size;
84004dbf RS	103	ssize_t count;
	104
	105	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	106	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	107	return -1;
	108	}
	109	if (available == 0) {
	110	rpc_set_error(rpc, "Socket has been closed");
1896d37b	111	return -1;
84004dbf	112	}
cdb19ec1 RS	113
	114	/* read record marker, 4 bytes at the beginning of every pdu */
	115	if (rpc->inbuf == NULL) {
	116	rpc->insize = 4;
	117	rpc->inbuf = malloc(rpc->insize);
	118	if (rpc->inbuf == NULL) {
	119	rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
	120	return -1;
	121	}
	122	}
	123	if (rpc->inpos < 4) {
	124	size = 4 - rpc->inpos;
	125
	126	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
	127	if (count == -1) {
	128	if (errno == EINTR) {
	129	return 0;
	130	}
	131	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	132	return -1;
	133	}
	134	available -= count;
	135	rpc->inpos += count;
	136	}
	137
	138	if (available == 0) {
	139	return 0;
	140	}
	141
	142	pdu_size = rpc_get_pdu_size(rpc->inbuf);
	143	if (rpc->insize < pdu_size) {
	144	unsigned char *buf;
	145
	146	buf = malloc(pdu_size);
	147	if (buf == NULL) {
	148	rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
	149	return -1;
	150	}
	151	memcpy(buf, rpc->inbuf, rpc->insize);
	152	free(rpc->inbuf);
	153	rpc->inbuf = buf;
	154	rpc->insize = rpc_get_pdu_size(rpc->inbuf);
84004dbf	155	}
cdb19ec1 RS	156
	157	size = available;
	158	if (size > rpc->insize - rpc->inpos) {
	159	size = rpc->insize - rpc->inpos;
84004dbf RS	160	}
84004dbf RS	161
cdb19ec1	162	count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
84004dbf RS	163	if (count == -1) {
84004dbf RS	164	if (errno == EINTR) {
84004dbf RS	165	return 0;
	166	}
	167	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
1896d37b	168	return -1;
84004dbf	169	}
cdb19ec1 RS	170	available -= count;
cdb19ec1 RS	171	rpc->inpos += count;
84004dbf	172
cdb19ec1 RS	173	if (rpc->inpos == rpc->insize) {
cdb19ec1 RS	174	if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
84004dbf	175	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	176	return -1;
84004dbf	177	}
cdb19ec1 RS	178	free(rpc->inbuf);
	179	rpc->inbuf = NULL;
	180	rpc->insize = 0;
	181	rpc->inpos = 0;
84004dbf	182	}
cdb19ec1	183
84004dbf RS	184	return 0;
	185	}
	186
	187
	188
	189	int rpc_service(struct rpc_context *rpc, int revents)
	190	{
	191	if (revents & POLLERR) {
912f7ad5 RS	192	int err = 0;
	193	socklen_t err_size = sizeof(err);
	194
	195	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
	196	&err, &err_size) != 0 \|\| err != 0) {
	197	if (err == 0) {
	198	err = errno;
	199	}
	200	rpc_set_error(rpc, "rpc_service: socket error "
	201	"%s(%d).",
	202	strerror(err), err);
84004dbf	203	} else {
912f7ad5 RS	204	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	205	"Unknown socket error.");
84004dbf RS	206	}
	207	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	208	return -1;
	209	}
	210	if (revents & POLLHUP) {
84004dbf RS	211	rpc_set_error(rpc, "Socket failed with POLLHUP");
84004dbf RS	212	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
1896d37b	213	return -1;
84004dbf RS	214	}
	215
	216	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
912f7ad5 RS	217	int err = 0;
	218	socklen_t err_size = sizeof(err);
	219
	220	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
	221	&err, &err_size) != 0 \|\| err != 0) {
	222	if (err == 0) {
	223	err = errno;
	224	}
	225	rpc_set_error(rpc, "rpc_service: socket error "
	226	"%s(%d) while connecting.",
	227	strerror(err), err);
	228	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
	229	NULL, rpc->connect_data);
	230	return -1;
	231	}
	232
84004dbf RS	233	rpc->is_connected = 1;
	234	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	235	return 0;
	236	}
	237
	238	if (revents & POLLOUT && rpc->outqueue != NULL) {
	239	if (rpc_write_to_socket(rpc) != 0) {
1896d37b RS	240	rpc_set_error(rpc, "write to socket failed");
1896d37b RS	241	return -1;
84004dbf RS	242	}
	243	}
	244
	245	if (revents & POLLIN) {
	246	if (rpc_read_from_socket(rpc) != 0) {
	247	rpc_disconnect(rpc, rpc_get_error(rpc));
1896d37b	248	return -1;
84004dbf RS	249	}
	250	}
	251
	252	return 0;
	253	}
	254
	255
	256	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	257	{
	258	struct sockaddr_storage s;
	259	struct sockaddr_in sin = (struct sockaddr_in )&s;
	260	int socksize;
	261
	262	if (rpc->fd != -1) {
	263	rpc_set_error(rpc, "Trying to connect while already connected");
84004dbf RS	264	return -1;
	265	}
	266
	267	sin->sin_family = AF_INET;
	268	sin->sin_port = htons(port);
	269	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	270	rpc_set_error(rpc, "Not a valid server ip address");
1896d37b	271	return -1;
84004dbf RS	272	}
	273
	274	switch (s.ss_family) {
	275	case AF_INET:
84004dbf	276	socksize = sizeof(struct sockaddr_in);
ea214e45 RS	277	#ifdef HAVE_SOCK_SIN_LEN
	278	sin->sin_len = socksize;
	279	#endif
	280	rpc->fd = socket(AF_INET, SOCK_STREAM, 0);
84004dbf RS	281	break;
	282	}
	283
	284	if (rpc->fd == -1) {
	285	rpc_set_error(rpc, "Failed to open socket");
1896d37b	286	return -1;
84004dbf RS	287	}
	288
	289	rpc->connect_cb = cb;
	290	rpc->connect_data = private_data;
	291
	292	set_nonblocking(rpc->fd);
	293
	294	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
	295	rpc_set_error(rpc, "connect() to server failed");
1896d37b	296	return -1;
84004dbf RS	297	}
	298
	299	return 0;
	300	}
	301
	302	int rpc_disconnect(struct rpc_context rpc, char error)
	303	{
	304	if (rpc->fd != -1) {
	305	close(rpc->fd);
	306	}
	307	rpc->fd = -1;
	308
	309	rpc->is_connected = 0;
	310
	311	rpc_error_all_pdus(rpc, error);
	312
	313	return 0;
	314	}