2 Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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.
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.
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/>.
30 #include <arpa/inet.h>
31 #ifdef HAVE_SYS_FILIO_H
32 #include <sys/filio.h>
34 #ifdef HAVE_SYS_SOCKIO_H
35 #include <sys/sockio.h>
37 #include <sys/ioctl.h>
38 #include <sys/types.h>
39 #include <sys/socket.h>
42 #include "libnfs-raw.h"
43 #include "libnfs-private.h"
46 static int rpc_disconnect_requeue(struct rpc_context
*rpc
);
48 static void set_nonblocking(int fd
)
51 v
= fcntl(fd
, F_GETFL
, 0);
52 fcntl(fd
, F_SETFL
, v
| O_NONBLOCK
);
55 int rpc_get_fd(struct rpc_context
*rpc
)
60 int rpc_which_events(struct rpc_context
*rpc
)
62 int events
= rpc
->is_connected
? POLLIN
: POLLOUT
;
64 if (rpc
->is_udp
!= 0) {
65 /* for udp sockets we only wait for pollin */
75 static int rpc_write_to_socket(struct rpc_context
*rpc
)
83 rpc_set_error(rpc
, "trying to write but not connected");
87 while (rpc
->outqueue
!= NULL
) {
90 total
= rpc
->outqueue
->outdata
.size
;
92 count
= write(rpc
->fd
, rpc
->outqueue
->outdata
.data
+ rpc
->outqueue
->written
, total
- rpc
->outqueue
->written
);
94 if (errno
== EAGAIN
|| errno
== EWOULDBLOCK
) {
97 rpc_set_error(rpc
, "Error when writing to socket :%s(%d)", strerror(errno
), errno
);
101 rpc
->outqueue
->written
+= count
;
102 if (rpc
->outqueue
->written
== total
) {
103 struct rpc_pdu
*pdu
= rpc
->outqueue
;
105 SLIST_REMOVE(&rpc
->outqueue
, pdu
);
106 SLIST_ADD_END(&rpc
->waitpdu
, pdu
);
112 static int rpc_read_from_socket(struct rpc_context
*rpc
)
119 if (ioctl(rpc
->fd
, FIONREAD
, &available
) != 0) {
120 rpc_set_error(rpc
, "Ioctl FIONREAD returned error : %d. Closing socket.", errno
);
123 if (available
== 0) {
124 rpc_set_error(rpc
, "Socket has been closed");
130 socklen_t socklen
= sizeof(rpc
->udp_src
);
132 buf
= malloc(available
);
134 rpc_set_error(rpc
, "Failed to malloc buffer for recvfrom");
137 count
= recvfrom(rpc
->fd
, buf
, available
, MSG_DONTWAIT
, (struct sockaddr
*)&rpc
->udp_src
, &socklen
);
139 rpc_set_error(rpc
, "Failed recvfrom: %s", strerror(errno
));
142 if (rpc_process_pdu(rpc
, buf
, count
) != 0) {
143 rpc_set_error(rpc
, "Invalid/garbage pdu received from server. Ignoring PDU");
151 /* read record marker, 4 bytes at the beginning of every pdu */
152 if (rpc
->inbuf
== NULL
) {
154 rpc
->inbuf
= malloc(rpc
->insize
);
155 if (rpc
->inbuf
== NULL
) {
156 rpc_set_error(rpc
, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno
);
160 if (rpc
->inpos
< 4) {
161 size
= 4 - rpc
->inpos
;
163 count
= read(rpc
->fd
, rpc
->inbuf
+ rpc
->inpos
, size
);
165 if (errno
== EINTR
) {
168 rpc_set_error(rpc
, "Read from socket failed, errno:%d. Closing socket.", errno
);
175 if (available
== 0) {
179 pdu_size
= rpc_get_pdu_size(rpc
->inbuf
);
180 if (rpc
->insize
< pdu_size
) {
183 buf
= malloc(pdu_size
);
185 rpc_set_error(rpc
, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size
, errno
);
188 memcpy(buf
, rpc
->inbuf
, rpc
->insize
);
191 rpc
->insize
= rpc_get_pdu_size(rpc
->inbuf
);
195 if (size
> rpc
->insize
- rpc
->inpos
) {
196 size
= rpc
->insize
- rpc
->inpos
;
199 count
= read(rpc
->fd
, rpc
->inbuf
+ rpc
->inpos
, size
);
201 if (errno
== EINTR
) {
204 rpc_set_error(rpc
, "Read from socket failed, errno:%d. Closing socket.", errno
);
210 if (rpc
->inpos
== rpc
->insize
) {
211 if (rpc_process_pdu(rpc
, rpc
->inbuf
, pdu_size
) != 0) {
212 rpc_set_error(rpc
, "Invalid/garbage pdu received from server. Closing socket");
226 int rpc_service(struct rpc_context
*rpc
, int revents
)
228 if (revents
& POLLERR
) {
230 socklen_t err_size
= sizeof(err
);
232 if (getsockopt(rpc
->fd
, SOL_SOCKET
, SO_ERROR
,
233 &err
, &err_size
) != 0 || err
!= 0) {
237 rpc_set_error(rpc
, "rpc_service: socket error "
241 rpc_set_error(rpc
, "rpc_service: POLLERR, "
242 "Unknown socket error.");
244 rpc
->connect_cb(rpc
, RPC_STATUS_ERROR
, rpc
->error_string
, rpc
->connect_data
);
247 if (revents
& POLLHUP
) {
248 rpc_set_error(rpc
, "Socket failed with POLLHUP");
249 rpc
->connect_cb(rpc
, RPC_STATUS_ERROR
, rpc
->error_string
, rpc
->connect_data
);
253 if (rpc
->is_connected
== 0 && rpc
->fd
!= -1 && revents
&POLLOUT
) {
255 socklen_t err_size
= sizeof(err
);
257 if (getsockopt(rpc
->fd
, SOL_SOCKET
, SO_ERROR
,
258 &err
, &err_size
) != 0 || err
!= 0) {
262 rpc_set_error(rpc
, "rpc_service: socket error "
263 "%s(%d) while connecting.",
265 rpc
->connect_cb(rpc
, RPC_STATUS_ERROR
,
266 NULL
, rpc
->connect_data
);
270 rpc
->is_connected
= 1;
271 rpc
->connect_cb(rpc
, RPC_STATUS_SUCCESS
, NULL
, rpc
->connect_data
);
275 if (revents
& POLLIN
) {
276 if (rpc_read_from_socket(rpc
) != 0) {
277 rpc_disconnect_requeue(rpc
);
282 if (revents
& POLLOUT
&& rpc
->outqueue
!= NULL
) {
283 if (rpc_write_to_socket(rpc
) != 0) {
284 rpc_set_error(rpc
, "write to socket failed");
293 int rpc_connect_async(struct rpc_context
*rpc
, const char *server
, int port
, rpc_cb cb
, void *private_data
)
295 struct sockaddr_storage s
;
296 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&s
;
300 rpc_set_error(rpc
, "Trying to connect while already connected");
304 if (rpc
->is_udp
!= 0) {
305 rpc_set_error(rpc
, "Trying to connect on UDP socket");
309 sin
->sin_family
= AF_INET
;
310 sin
->sin_port
= htons(port
);
311 if (inet_pton(AF_INET
, server
, &sin
->sin_addr
) != 1) {
312 rpc_set_error(rpc
, "Not a valid server ip address");
316 switch (s
.ss_family
) {
318 socksize
= sizeof(struct sockaddr_in
);
319 #ifdef HAVE_SOCKADDR_LEN
320 sin
->sin_len
= socksize
;
322 rpc
->fd
= socket(AF_INET
, SOCK_STREAM
, 0);
327 rpc_set_error(rpc
, "Failed to open socket");
331 rpc
->connect_cb
= cb
;
332 rpc
->connect_data
= private_data
;
334 set_nonblocking(rpc
->fd
);
336 if (connect(rpc
->fd
, (struct sockaddr
*)&s
, socksize
) != 0 && errno
!= EINPROGRESS
) {
337 rpc_set_error(rpc
, "connect() to server failed");
344 int rpc_disconnect(struct rpc_context
*rpc
, char *error
)
351 rpc
->is_connected
= 0;
353 rpc_error_all_pdus(rpc
, error
);
358 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
359 static int rpc_disconnect_requeue(struct rpc_context
*rpc
)
368 rpc
->is_connected
= 0;
370 /* socket is closed so we will not get any replies to any commands
371 * in flight. Move them all over from the waitpdu queue back to the out queue
373 for (pdu
=rpc
->waitpdu
; pdu
; pdu
=pdu
->next
) {
374 SLIST_REMOVE(&rpc
->waitpdu
, pdu
);
375 SLIST_ADD(&rpc
->outqueue
, pdu
);
382 int rpc_bind_udp(struct rpc_context
*rpc
, char *addr
, int port
)
384 struct addrinfo
*ai
= NULL
;
387 if (rpc
->is_udp
== 0) {
388 rpc_set_error(rpc
, "Cant not bind UDP. Not UDP context");
392 snprintf(service
, 6, "%d", port
);
393 if (getaddrinfo(addr
, service
, NULL
, &ai
) != 0) {
394 rpc_set_error(rpc
, "Invalid address:%s. "
395 "Can not resolv into IPv4/v6 structure.");
399 switch(ai
->ai_family
) {
401 rpc
->fd
= socket(ai
->ai_family
, SOCK_DGRAM
, 0);
403 rpc_set_error(rpc
, "Failed to create UDP socket: %s", strerror(errno
));
408 if (bind(rpc
->fd
, (struct sockaddr
*)ai
->ai_addr
, sizeof(struct sockaddr_in
)) != 0) {
409 rpc_set_error(rpc
, "Failed to bind to UDP socket: %s",strerror(errno
));
415 rpc_set_error(rpc
, "Can not handle UPD sockets of family %d yet", ai
->ai_family
);
425 int rpc_set_udp_destination(struct rpc_context
*rpc
, char *addr
, int port
, int is_broadcast
)
427 struct addrinfo
*ai
= NULL
;
430 if (rpc
->is_udp
== 0) {
431 rpc_set_error(rpc
, "Can not set destination sockaddr. Not UDP context");
435 snprintf(service
, 6, "%d", port
);
436 if (getaddrinfo(addr
, service
, NULL
, &ai
) != 0) {
437 rpc_set_error(rpc
, "Invalid address:%s. "
438 "Can not resolv into IPv4/v6 structure.");
444 rpc
->udp_dest
= NULL
;
446 rpc
->udp_dest
= malloc(ai
->ai_addrlen
);
447 if (rpc
->udp_dest
== NULL
) {
448 rpc_set_error(rpc
, "Out of memory. Failed to allocate sockaddr structure");
451 memcpy(rpc
->udp_dest
, ai
->ai_addr
, ai
->ai_addrlen
);
454 rpc
->is_broadcast
= is_broadcast
;
455 setsockopt(rpc
->fd
, SOL_SOCKET
, SO_BROADCAST
, &is_broadcast
, sizeof(is_broadcast
));
460 struct sockaddr
*rpc_get_recv_sockaddr(struct rpc_context
*rpc
)
462 return (struct sockaddr
*)&rpc
->udp_src
;