[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->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;
	unsigned char *buf;
	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;
	}
	size = rpc->insize - rpc->inpos + available;
	buf = malloc(size);
	if (buf == NULL) {
		rpc_set_error(rpc, "Out of memory: failed to allocate %d bytes for input buffer. Closing socket.", size);
		return -1;
	}
	if (rpc->insize > rpc->inpos) {
		memcpy(buf, rpc->inbuf + rpc->inpos, rpc->insize - rpc->inpos);
		rpc->insize -= rpc->inpos;
		rpc->inpos   = 0;
	}

	count = read(rpc->fd, buf + rpc->insize, available);
	if (count == -1) {
		if (errno == EINTR) {
			free(buf);
			buf = NULL;
			return 0;
		}
		rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
		free(buf);
		buf = NULL;
		return -1;
	}

	if (rpc->inbuf != NULL) {
		free(rpc->inbuf);
	}
	rpc->inbuf   = (char *)buf;
	rpc->insize += count;

	while (1) {
		if (rpc->insize - rpc->inpos < 4) {
			return 0;
		}
		count = rpc_get_pdu_size(rpc->inbuf + rpc->inpos);
		if (rpc->insize + rpc->inpos < count) {
			return 0;
		}
		if (rpc_process_pdu(rpc, rpc->inbuf + rpc->inpos, count) != 0) {
			rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
			return -1;
		}
		rpc->inpos += count;
		if (rpc->inpos == rpc->insize) {
			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 RS	49
	50	if (rpc->outqueue) {
	51	events \|= POLLOUT;
	52	}
	53	return events;
	54	}
	55
	56	static int rpc_write_to_socket(struct rpc_context *rpc)
	57	{
	58	ssize_t count;
	59
	60	if (rpc == NULL) {
84004dbf RS	61	return -1;
	62	}
	63	if (rpc->fd == -1) {
1896d37b RS	64	rpc_set_error(rpc, "trying to write but not connected");
1896d37b RS	65	return -1;
84004dbf RS	66	}
	67
	68	while (rpc->outqueue != NULL) {
	69	ssize_t total;
	70
	71	total = rpc->outqueue->outdata.size;
	72
	73	count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
	74	if (count == -1) {
	75	if (errno == EAGAIN \|\| errno == EWOULDBLOCK) {
84004dbf RS	76	return 0;
84004dbf RS	77	}
1896d37b RS	78	rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
1896d37b RS	79	return -1;
84004dbf RS	80	}
	81
	82	rpc->outqueue->written += count;
	83	if (rpc->outqueue->written == total) {
	84	struct rpc_pdu *pdu = rpc->outqueue;
	85
	86	SLIST_REMOVE(&rpc->outqueue, pdu);
	87	SLIST_ADD_END(&rpc->waitpdu, pdu);
	88	}
	89	}
	90	return 0;
	91	}
	92
	93	static int rpc_read_from_socket(struct rpc_context *rpc)
	94	{
	95	int available;
	96	int size;
	97	unsigned char *buf;
	98	ssize_t count;
	99
	100	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
	101	rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
	102	return -1;
	103	}
	104	if (available == 0) {
	105	rpc_set_error(rpc, "Socket has been closed");
1896d37b	106	return -1;
84004dbf RS	107	}
	108	size = rpc->insize - rpc->inpos + available;
	109	buf = malloc(size);
	110	if (buf == NULL) {
	111	rpc_set_error(rpc, "Out of memory: failed to allocate %d bytes for input buffer. Closing socket.", size);
1896d37b	112	return -1;
84004dbf RS	113	}
	114	if (rpc->insize > rpc->inpos) {
	115	memcpy(buf, rpc->inbuf + rpc->inpos, rpc->insize - rpc->inpos);
	116	rpc->insize -= rpc->inpos;
	117	rpc->inpos = 0;
	118	}
	119
	120	count = read(rpc->fd, buf + rpc->insize, available);
	121	if (count == -1) {
	122	if (errno == EINTR) {
	123	free(buf);
	124	buf = NULL;
	125	return 0;
	126	}
	127	rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
	128	free(buf);
	129	buf = NULL;
1896d37b	130	return -1;
84004dbf RS	131	}
	132
	133	if (rpc->inbuf != NULL) {
	134	free(rpc->inbuf);
	135	}
	136	rpc->inbuf = (char *)buf;
	137	rpc->insize += count;
	138
	139	while (1) {
	140	if (rpc->insize - rpc->inpos < 4) {
	141	return 0;
	142	}
	143	count = rpc_get_pdu_size(rpc->inbuf + rpc->inpos);
	144	if (rpc->insize + rpc->inpos < count) {
	145	return 0;
	146	}
	147	if (rpc_process_pdu(rpc, rpc->inbuf + rpc->inpos, count) != 0) {
	148	rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
1896d37b	149	return -1;
84004dbf RS	150	}
	151	rpc->inpos += count;
	152	if (rpc->inpos == rpc->insize) {
	153	free(rpc->inbuf);
	154	rpc->inbuf = NULL;
	155	rpc->insize = 0;
	156	rpc->inpos = 0;
	157	}
	158	}
	159	return 0;
	160	}
	161
	162
	163
	164	int rpc_service(struct rpc_context *rpc, int revents)
	165	{
	166	if (revents & POLLERR) {
912f7ad5 RS	167	int err = 0;
	168	socklen_t err_size = sizeof(err);
	169
	170	if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
	171	&err, &err_size) != 0 \|\| err != 0) {
	172	if (err == 0) {
	173	err = errno;
	174	}
	175	rpc_set_error(rpc, "rpc_service: socket error "
	176	"%s(%d).",
	177	strerror(err), err);
84004dbf	178	} else {
912f7ad5 RS	179	rpc_set_error(rpc, "rpc_service: POLLERR, "
912f7ad5 RS	180	"Unknown socket error.");
84004dbf RS	181	}
	182	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
	183	return -1;
	184	}
	185	if (revents & POLLHUP) {
84004dbf RS	186	rpc_set_error(rpc, "Socket failed with POLLHUP");
84004dbf RS	187	rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
1896d37b	188	return -1;
84004dbf RS	189	}
	190
	191	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
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) while connecting.",
	202	strerror(err), err);
	203	rpc->connect_cb(rpc, RPC_STATUS_ERROR,
	204	NULL, rpc->connect_data);
	205	return -1;
	206	}
	207
84004dbf RS	208	rpc->is_connected = 1;
	209	rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
	210	return 0;
	211	}
	212
	213	if (revents & POLLOUT && rpc->outqueue != NULL) {
	214	if (rpc_write_to_socket(rpc) != 0) {
1896d37b RS	215	rpc_set_error(rpc, "write to socket failed");
1896d37b RS	216	return -1;
84004dbf RS	217	}
	218	}
	219
	220	if (revents & POLLIN) {
	221	if (rpc_read_from_socket(rpc) != 0) {
	222	rpc_disconnect(rpc, rpc_get_error(rpc));
1896d37b	223	return -1;
84004dbf RS	224	}
	225	}
	226
	227	return 0;
	228	}
	229
	230
	231	int rpc_connect_async(struct rpc_context rpc, const char server, int port, rpc_cb cb, void *private_data)
	232	{
	233	struct sockaddr_storage s;
	234	struct sockaddr_in sin = (struct sockaddr_in )&s;
	235	int socksize;
	236
	237	if (rpc->fd != -1) {
	238	rpc_set_error(rpc, "Trying to connect while already connected");
84004dbf RS	239	return -1;
	240	}
	241
	242	sin->sin_family = AF_INET;
	243	sin->sin_port = htons(port);
	244	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
	245	rpc_set_error(rpc, "Not a valid server ip address");
1896d37b	246	return -1;
84004dbf RS	247	}
	248
	249	switch (s.ss_family) {
	250	case AF_INET:
84004dbf	251	socksize = sizeof(struct sockaddr_in);
ea214e45 RS	252	#ifdef HAVE_SOCK_SIN_LEN
	253	sin->sin_len = socksize;
	254	#endif
	255	rpc->fd = socket(AF_INET, SOCK_STREAM, 0);
84004dbf RS	256	break;
	257	}
	258
	259	if (rpc->fd == -1) {
	260	rpc_set_error(rpc, "Failed to open socket");
1896d37b	261	return -1;
84004dbf RS	262	}
	263
	264	rpc->connect_cb = cb;
	265	rpc->connect_data = private_data;
	266
	267	set_nonblocking(rpc->fd);
	268
	269	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
	270	rpc_set_error(rpc, "connect() to server failed");
1896d37b	271	return -1;
84004dbf RS	272	}
	273
	274	return 0;
	275	}
	276
	277	int rpc_disconnect(struct rpc_context rpc, char error)
	278	{
	279	if (rpc->fd != -1) {
	280	close(rpc->fd);
	281	}
	282	rpc->fd = -1;
	283
	284	rpc->is_connected = 0;
	285
	286	rpc_error_all_pdus(rpc, error);
	287
	288	return 0;
	289	}