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dabf4152 AM |
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 | #ifdef HAVE_CONFIG_H | |
19 | #include "config.h" | |
20 | #endif | |
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <unistd.h> | |
24 | #include <fcntl.h> | |
25 | #include <poll.h> | |
26 | #include <string.h> | |
27 | #include <errno.h> | |
28 | #include <rpc/rpc.h> | |
29 | #include <rpc/xdr.h> | |
30 | #include <arpa/inet.h> | |
31 | #ifdef HAVE_SYS_FILIO_H | |
32 | #include <sys/filio.h> | |
33 | #endif | |
34 | #include <sys/ioctl.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/socket.h> | |
37 | #include <netdb.h> | |
38 | #include "libnfs.h" | |
39 | #include "libnfs-raw.h" | |
40 | #include "libnfs-private.h" | |
41 | #include "slist.h" | |
42 | ||
43 | static void set_nonblocking(int fd) | |
44 | { | |
45 | unsigned v; | |
46 | v = fcntl(fd, F_GETFL, 0); | |
47 | fcntl(fd, F_SETFL, v | O_NONBLOCK); | |
48 | } | |
49 | ||
50 | int rpc_get_fd(struct rpc_context *rpc) | |
51 | { | |
52 | return rpc->fd; | |
53 | } | |
54 | ||
55 | int rpc_which_events(struct rpc_context *rpc) | |
56 | { | |
57 | int events = rpc->is_connected ? POLLIN : POLLOUT; | |
58 | ||
59 | if (rpc->is_udp != 0) { | |
60 | /* for udp sockets we only wait for pollin */ | |
61 | return POLLIN; | |
62 | } | |
63 | ||
64 | if (rpc->outqueue) { | |
65 | events |= POLLOUT; | |
66 | } | |
67 | return events; | |
68 | } | |
69 | ||
70 | static int rpc_write_to_socket(struct rpc_context *rpc) | |
71 | { | |
72 | ssize_t count; | |
73 | ||
74 | if (rpc == NULL) { | |
75 | return -1; | |
76 | } | |
77 | if (rpc->fd == -1) { | |
78 | rpc_set_error(rpc, "trying to write but not connected"); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | while (rpc->outqueue != NULL) { | |
83 | ssize_t total; | |
84 | ||
85 | total = rpc->outqueue->outdata.size; | |
86 | ||
87 | count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written); | |
88 | if (count == -1) { | |
89 | if (errno == EAGAIN || errno == EWOULDBLOCK) { | |
90 | return 0; | |
91 | } | |
92 | rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | rpc->outqueue->written += count; | |
97 | if (rpc->outqueue->written == total) { | |
98 | struct rpc_pdu *pdu = rpc->outqueue; | |
99 | ||
100 | SLIST_REMOVE(&rpc->outqueue, pdu); | |
101 | SLIST_ADD_END(&rpc->waitpdu, pdu); | |
102 | } | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int rpc_read_from_socket(struct rpc_context *rpc) | |
108 | { | |
109 | int available; | |
110 | int size; | |
111 | int pdu_size; | |
112 | ssize_t count; | |
113 | ||
114 | if (ioctl(rpc->fd, FIONREAD, &available) != 0) { | |
115 | rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno); | |
116 | return -1; | |
117 | } | |
118 | if (available == 0) { | |
119 | rpc_set_error(rpc, "Socket has been closed"); | |
120 | return -1; | |
121 | } | |
122 | ||
123 | if (rpc->is_udp) { | |
124 | char *buf; | |
125 | socklen_t socklen = sizeof(rpc->udp_src); | |
126 | ||
127 | buf = malloc(available); | |
128 | if (buf == NULL) { | |
129 | rpc_set_error(rpc, "Failed to malloc buffer for recvfrom"); | |
130 | return -1; | |
131 | } | |
132 | count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen); | |
133 | if (count < 0) { | |
134 | rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno)); | |
135 | free(buf); | |
136 | } | |
137 | if (rpc_process_pdu(rpc, buf, count) != 0) { | |
138 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU"); | |
139 | free(buf); | |
140 | return -1; | |
141 | } | |
142 | free(buf); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | /* read record marker, 4 bytes at the beginning of every pdu */ | |
147 | if (rpc->inbuf == NULL) { | |
148 | rpc->insize = 4; | |
149 | rpc->inbuf = malloc(rpc->insize); | |
150 | if (rpc->inbuf == NULL) { | |
151 | rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno); | |
152 | return -1; | |
153 | } | |
154 | } | |
155 | if (rpc->inpos < 4) { | |
156 | size = 4 - rpc->inpos; | |
157 | ||
158 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); | |
159 | if (count == -1) { | |
160 | if (errno == EINTR) { | |
161 | return 0; | |
162 | } | |
163 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); | |
164 | return -1; | |
165 | } | |
166 | available -= count; | |
167 | rpc->inpos += count; | |
168 | } | |
169 | ||
170 | if (available == 0) { | |
171 | return 0; | |
172 | } | |
173 | ||
174 | pdu_size = rpc_get_pdu_size(rpc->inbuf); | |
175 | if (rpc->insize < pdu_size) { | |
176 | unsigned char *buf; | |
177 | ||
178 | buf = malloc(pdu_size); | |
179 | if (buf == NULL) { | |
180 | rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno); | |
181 | return -1; | |
182 | } | |
183 | memcpy(buf, rpc->inbuf, rpc->insize); | |
184 | free(rpc->inbuf); | |
185 | rpc->inbuf = buf; | |
186 | rpc->insize = rpc_get_pdu_size(rpc->inbuf); | |
187 | } | |
188 | ||
189 | size = available; | |
190 | if (size > rpc->insize - rpc->inpos) { | |
191 | size = rpc->insize - rpc->inpos; | |
192 | } | |
193 | ||
194 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); | |
195 | if (count == -1) { | |
196 | if (errno == EINTR) { | |
197 | return 0; | |
198 | } | |
199 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); | |
200 | return -1; | |
201 | } | |
202 | available -= count; | |
203 | rpc->inpos += count; | |
204 | ||
205 | if (rpc->inpos == rpc->insize) { | |
206 | if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) { | |
207 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket"); | |
208 | return -1; | |
209 | } | |
210 | free(rpc->inbuf); | |
211 | rpc->inbuf = NULL; | |
212 | rpc->insize = 0; | |
213 | rpc->inpos = 0; | |
214 | } | |
215 | ||
216 | return 0; | |
217 | } | |
218 | ||
219 | ||
220 | ||
221 | int rpc_service(struct rpc_context *rpc, int revents) | |
222 | { | |
223 | if (revents & POLLERR) { | |
224 | int err = 0; | |
225 | socklen_t err_size = sizeof(err); | |
226 | ||
227 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, | |
228 | &err, &err_size) != 0 || err != 0) { | |
229 | if (err == 0) { | |
230 | err = errno; | |
231 | } | |
232 | rpc_set_error(rpc, "rpc_service: socket error " | |
233 | "%s(%d).", | |
234 | strerror(err), err); | |
235 | } else { | |
236 | rpc_set_error(rpc, "rpc_service: POLLERR, " | |
237 | "Unknown socket error."); | |
238 | } | |
239 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
240 | return -1; | |
241 | } | |
242 | if (revents & POLLHUP) { | |
243 | rpc_set_error(rpc, "Socket failed with POLLHUP"); | |
244 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
245 | return -1; | |
246 | } | |
247 | ||
248 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { | |
249 | int err = 0; | |
250 | socklen_t err_size = sizeof(err); | |
251 | ||
252 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, | |
253 | &err, &err_size) != 0 || err != 0) { | |
254 | if (err == 0) { | |
255 | err = errno; | |
256 | } | |
257 | rpc_set_error(rpc, "rpc_service: socket error " | |
258 | "%s(%d) while connecting.", | |
259 | strerror(err), err); | |
260 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, | |
261 | NULL, rpc->connect_data); | |
262 | return -1; | |
263 | } | |
264 | ||
265 | rpc->is_connected = 1; | |
266 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); | |
267 | return 0; | |
268 | } | |
269 | ||
270 | if (revents & POLLOUT && rpc->outqueue != NULL) { | |
271 | if (rpc_write_to_socket(rpc) != 0) { | |
272 | rpc_set_error(rpc, "write to socket failed"); | |
273 | return -1; | |
274 | } | |
275 | } | |
276 | ||
277 | if (revents & POLLIN) { | |
278 | if (rpc_read_from_socket(rpc) != 0) { | |
279 | rpc_disconnect(rpc, rpc_get_error(rpc)); | |
280 | return -1; | |
281 | } | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | ||
288 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) | |
289 | { | |
290 | struct sockaddr_storage s; | |
291 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; | |
292 | int socksize; | |
293 | ||
294 | if (rpc->fd != -1) { | |
295 | rpc_set_error(rpc, "Trying to connect while already connected"); | |
296 | return -1; | |
297 | } | |
298 | ||
299 | if (rpc->is_udp != 0) { | |
300 | rpc_set_error(rpc, "Trying to connect on UDP socket"); | |
301 | return -1; | |
302 | } | |
303 | ||
304 | sin->sin_family = AF_INET; | |
305 | sin->sin_port = htons(port); | |
306 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { | |
307 | rpc_set_error(rpc, "Not a valid server ip address"); | |
308 | return -1; | |
309 | } | |
310 | ||
311 | switch (s.ss_family) { | |
312 | case AF_INET: | |
313 | socksize = sizeof(struct sockaddr_in); | |
314 | #ifdef HAVE_SOCKADDR_LEN | |
315 | sin->sin_len = socksize; | |
316 | #endif | |
317 | rpc->fd = socket(AF_INET, SOCK_STREAM, 0); | |
318 | break; | |
319 | } | |
320 | ||
321 | if (rpc->fd == -1) { | |
322 | rpc_set_error(rpc, "Failed to open socket"); | |
323 | return -1; | |
324 | } | |
325 | ||
326 | rpc->connect_cb = cb; | |
327 | rpc->connect_data = private_data; | |
328 | ||
329 | set_nonblocking(rpc->fd); | |
330 | ||
331 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) { | |
332 | rpc_set_error(rpc, "connect() to server failed"); | |
333 | return -1; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | int rpc_disconnect(struct rpc_context *rpc, char *error) | |
340 | { | |
341 | if (rpc->fd != -1) { | |
342 | close(rpc->fd); | |
343 | } | |
344 | rpc->fd = -1; | |
345 | ||
346 | rpc->is_connected = 0; | |
347 | ||
348 | rpc_error_all_pdus(rpc, error); | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | ||
354 | int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port) | |
355 | { | |
356 | struct addrinfo *ai = NULL; | |
357 | char service[6]; | |
358 | ||
359 | if (rpc->is_udp == 0) { | |
360 | rpc_set_error(rpc, "Cant not bind UDP. Not UDP context"); | |
361 | return -1; | |
362 | } | |
363 | ||
364 | snprintf(service, 6, "%d", port); | |
365 | if (getaddrinfo(addr, service, NULL, &ai) != 0) { | |
366 | rpc_set_error(rpc, "Invalid address:%s. " | |
367 | "Can not resolv into IPv4/v6 structure."); | |
368 | return -1; | |
369 | } | |
370 | ||
371 | switch(ai->ai_family) { | |
372 | case AF_INET: | |
373 | rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0); | |
374 | if (rpc->fd == -1) { | |
375 | rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno)); | |
376 | freeaddrinfo(ai); | |
377 | return -1; | |
378 | } | |
379 | ||
380 | if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) { | |
381 | rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno)); | |
382 | freeaddrinfo(ai); | |
383 | return -1; | |
384 | } | |
385 | break; | |
386 | default: | |
387 | rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family); | |
388 | freeaddrinfo(ai); | |
389 | return -1; | |
390 | } | |
391 | ||
392 | freeaddrinfo(ai); | |
393 | ||
394 | return 0; | |
395 | } | |
396 | ||
397 | int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast) | |
398 | { | |
399 | struct addrinfo *ai = NULL; | |
400 | char service[6]; | |
401 | ||
402 | if (rpc->is_udp == 0) { | |
403 | rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context"); | |
404 | return -1; | |
405 | } | |
406 | ||
407 | snprintf(service, 6, "%d", port); | |
408 | if (getaddrinfo(addr, service, NULL, &ai) != 0) { | |
409 | rpc_set_error(rpc, "Invalid address:%s. " | |
410 | "Can not resolv into IPv4/v6 structure."); | |
411 | return -1; | |
412 | } | |
413 | ||
414 | if (rpc->udp_dest) { | |
415 | free(rpc->udp_dest); | |
416 | rpc->udp_dest = NULL; | |
417 | } | |
418 | rpc->udp_dest = malloc(ai->ai_addrlen); | |
419 | if (rpc->udp_dest == NULL) { | |
420 | rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure"); | |
421 | return -1; | |
422 | } | |
423 | memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen); | |
424 | freeaddrinfo(ai); | |
425 | ||
426 | rpc->is_broadcast = is_broadcast; | |
427 | setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, &is_broadcast, sizeof(is_broadcast)); | |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc) | |
433 | { | |
434 | return (struct sockaddr *)&rpc->udp_src; | |
435 | } |