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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"); |
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; |
77 | } | |
1896d37b RS |
78 | rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno); |
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; | |
cdb19ec1 | 97 | int pdu_size; |
84004dbf RS |
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 | 107 | } |
cdb19ec1 RS |
108 | |
109 | /* read record marker, 4 bytes at the beginning of every pdu */ | |
110 | if (rpc->inbuf == NULL) { | |
111 | rpc->insize = 4; | |
112 | rpc->inbuf = malloc(rpc->insize); | |
113 | if (rpc->inbuf == NULL) { | |
114 | rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno); | |
115 | return -1; | |
116 | } | |
117 | } | |
118 | if (rpc->inpos < 4) { | |
119 | size = 4 - rpc->inpos; | |
120 | ||
121 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); | |
122 | if (count == -1) { | |
123 | if (errno == EINTR) { | |
124 | return 0; | |
125 | } | |
126 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); | |
127 | return -1; | |
128 | } | |
129 | available -= count; | |
130 | rpc->inpos += count; | |
131 | } | |
132 | ||
133 | if (available == 0) { | |
134 | return 0; | |
135 | } | |
136 | ||
137 | pdu_size = rpc_get_pdu_size(rpc->inbuf); | |
138 | if (rpc->insize < pdu_size) { | |
139 | unsigned char *buf; | |
140 | ||
141 | buf = malloc(pdu_size); | |
142 | if (buf == NULL) { | |
143 | rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno); | |
144 | return -1; | |
145 | } | |
146 | memcpy(buf, rpc->inbuf, rpc->insize); | |
147 | free(rpc->inbuf); | |
148 | rpc->inbuf = buf; | |
149 | rpc->insize = rpc_get_pdu_size(rpc->inbuf); | |
84004dbf | 150 | } |
cdb19ec1 RS |
151 | |
152 | size = available; | |
153 | if (size > rpc->insize - rpc->inpos) { | |
154 | size = rpc->insize - rpc->inpos; | |
84004dbf RS |
155 | } |
156 | ||
cdb19ec1 | 157 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); |
84004dbf RS |
158 | if (count == -1) { |
159 | if (errno == EINTR) { | |
84004dbf RS |
160 | return 0; |
161 | } | |
162 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); | |
1896d37b | 163 | return -1; |
84004dbf | 164 | } |
cdb19ec1 RS |
165 | available -= count; |
166 | rpc->inpos += count; | |
84004dbf | 167 | |
cdb19ec1 RS |
168 | if (rpc->inpos == rpc->insize) { |
169 | if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) { | |
84004dbf | 170 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket"); |
1896d37b | 171 | return -1; |
84004dbf | 172 | } |
cdb19ec1 RS |
173 | free(rpc->inbuf); |
174 | rpc->inbuf = NULL; | |
175 | rpc->insize = 0; | |
176 | rpc->inpos = 0; | |
84004dbf | 177 | } |
cdb19ec1 | 178 | |
84004dbf RS |
179 | return 0; |
180 | } | |
181 | ||
182 | ||
183 | ||
184 | int rpc_service(struct rpc_context *rpc, int revents) | |
185 | { | |
186 | if (revents & POLLERR) { | |
912f7ad5 RS |
187 | int err = 0; |
188 | socklen_t err_size = sizeof(err); | |
189 | ||
190 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, | |
191 | &err, &err_size) != 0 || err != 0) { | |
192 | if (err == 0) { | |
193 | err = errno; | |
194 | } | |
195 | rpc_set_error(rpc, "rpc_service: socket error " | |
196 | "%s(%d).", | |
197 | strerror(err), err); | |
84004dbf | 198 | } else { |
912f7ad5 RS |
199 | rpc_set_error(rpc, "rpc_service: POLLERR, " |
200 | "Unknown socket error."); | |
84004dbf RS |
201 | } |
202 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
203 | return -1; | |
204 | } | |
205 | if (revents & POLLHUP) { | |
84004dbf RS |
206 | rpc_set_error(rpc, "Socket failed with POLLHUP"); |
207 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
1896d37b | 208 | return -1; |
84004dbf RS |
209 | } |
210 | ||
211 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { | |
912f7ad5 RS |
212 | int err = 0; |
213 | socklen_t err_size = sizeof(err); | |
214 | ||
215 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, | |
216 | &err, &err_size) != 0 || err != 0) { | |
217 | if (err == 0) { | |
218 | err = errno; | |
219 | } | |
220 | rpc_set_error(rpc, "rpc_service: socket error " | |
221 | "%s(%d) while connecting.", | |
222 | strerror(err), err); | |
223 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, | |
224 | NULL, rpc->connect_data); | |
225 | return -1; | |
226 | } | |
227 | ||
84004dbf RS |
228 | rpc->is_connected = 1; |
229 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | if (revents & POLLOUT && rpc->outqueue != NULL) { | |
234 | if (rpc_write_to_socket(rpc) != 0) { | |
1896d37b RS |
235 | rpc_set_error(rpc, "write to socket failed"); |
236 | return -1; | |
84004dbf RS |
237 | } |
238 | } | |
239 | ||
240 | if (revents & POLLIN) { | |
241 | if (rpc_read_from_socket(rpc) != 0) { | |
242 | rpc_disconnect(rpc, rpc_get_error(rpc)); | |
1896d37b | 243 | return -1; |
84004dbf RS |
244 | } |
245 | } | |
246 | ||
247 | return 0; | |
248 | } | |
249 | ||
250 | ||
251 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) | |
252 | { | |
253 | struct sockaddr_storage s; | |
254 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; | |
255 | int socksize; | |
256 | ||
257 | if (rpc->fd != -1) { | |
258 | rpc_set_error(rpc, "Trying to connect while already connected"); | |
84004dbf RS |
259 | return -1; |
260 | } | |
261 | ||
262 | sin->sin_family = AF_INET; | |
263 | sin->sin_port = htons(port); | |
264 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { | |
265 | rpc_set_error(rpc, "Not a valid server ip address"); | |
1896d37b | 266 | return -1; |
84004dbf RS |
267 | } |
268 | ||
269 | switch (s.ss_family) { | |
270 | case AF_INET: | |
84004dbf | 271 | socksize = sizeof(struct sockaddr_in); |
ea214e45 RS |
272 | #ifdef HAVE_SOCK_SIN_LEN |
273 | sin->sin_len = socksize; | |
274 | #endif | |
275 | rpc->fd = socket(AF_INET, SOCK_STREAM, 0); | |
84004dbf RS |
276 | break; |
277 | } | |
278 | ||
279 | if (rpc->fd == -1) { | |
280 | rpc_set_error(rpc, "Failed to open socket"); | |
1896d37b | 281 | return -1; |
84004dbf RS |
282 | } |
283 | ||
284 | rpc->connect_cb = cb; | |
285 | rpc->connect_data = private_data; | |
286 | ||
287 | set_nonblocking(rpc->fd); | |
288 | ||
289 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) { | |
290 | rpc_set_error(rpc, "connect() to server failed"); | |
1896d37b | 291 | return -1; |
84004dbf RS |
292 | } |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | int rpc_disconnect(struct rpc_context *rpc, char *error) | |
298 | { | |
299 | if (rpc->fd != -1) { | |
300 | close(rpc->fd); | |
301 | } | |
302 | rpc->fd = -1; | |
303 | ||
304 | rpc->is_connected = 0; | |
305 | ||
306 | rpc_error_all_pdus(rpc, error); | |
307 | ||
308 | return 0; | |
309 | } |