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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; | |
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, " |
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"); |
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"); |
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 | } |