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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> | |
19 | #include <unistd.h> | |
20 | #include <fcntl.h> | |
21 | #include <poll.h> | |
22 | #include <string.h> | |
23 | #include <errno.h> | |
24 | #include <rpc/xdr.h> | |
25 | #include <arpa/inet.h> | |
26 | #include <sys/ioctl.h> | |
27 | #include "libnfs.h" | |
28 | #include "libnfs-raw.h" | |
29 | #include "libnfs-private.h" | |
30 | #include "slist.h" | |
31 | ||
32 | static void set_nonblocking(int fd) | |
33 | { | |
34 | unsigned v; | |
35 | v = fcntl(fd, F_GETFL, 0); | |
36 | fcntl(fd, F_SETFL, v | O_NONBLOCK); | |
37 | } | |
38 | ||
39 | int rpc_get_fd(struct rpc_context *rpc) | |
40 | { | |
41 | return rpc->fd; | |
42 | } | |
43 | ||
44 | int rpc_which_events(struct rpc_context *rpc) | |
45 | { | |
912f7ad5 | 46 | int events = rpc->is_connected ? POLLIN : POLLOUT; |
84004dbf RS |
47 | |
48 | if (rpc->outqueue) { | |
49 | events |= POLLOUT; | |
50 | } | |
51 | return events; | |
52 | } | |
53 | ||
54 | static int rpc_write_to_socket(struct rpc_context *rpc) | |
55 | { | |
56 | ssize_t count; | |
57 | ||
58 | if (rpc == NULL) { | |
59 | printf("trying to write to socket for NULL context\n"); | |
60 | return -1; | |
61 | } | |
62 | if (rpc->fd == -1) { | |
63 | printf("trying to write but not connected\n"); | |
64 | return -2; | |
65 | } | |
66 | ||
67 | while (rpc->outqueue != NULL) { | |
68 | ssize_t total; | |
69 | ||
70 | total = rpc->outqueue->outdata.size; | |
71 | ||
72 | count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written); | |
73 | if (count == -1) { | |
74 | if (errno == EAGAIN || errno == EWOULDBLOCK) { | |
75 | printf("socket would block, return from write to socket\n"); | |
76 | return 0; | |
77 | } | |
78 | printf("Error when writing to socket :%s(%d)\n", strerror(errno), errno); | |
79 | return -3; | |
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"); | |
106 | return -2; | |
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); | |
112 | return -3; | |
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; | |
130 | return -4; | |
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"); | |
149 | return -5; | |
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) { | |
186 | printf("rpc_service: POLLHUP, socket error\n"); | |
187 | rpc_set_error(rpc, "Socket failed with POLLHUP"); | |
188 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
189 | return -2; | |
190 | } | |
191 | ||
192 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { | |
912f7ad5 RS |
193 | int err = 0; |
194 | socklen_t err_size = sizeof(err); | |
195 | ||
196 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, | |
197 | &err, &err_size) != 0 || err != 0) { | |
198 | if (err == 0) { | |
199 | err = errno; | |
200 | } | |
201 | rpc_set_error(rpc, "rpc_service: socket error " | |
202 | "%s(%d) while connecting.", | |
203 | strerror(err), err); | |
204 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, | |
205 | NULL, rpc->connect_data); | |
206 | return -1; | |
207 | } | |
208 | ||
84004dbf RS |
209 | rpc->is_connected = 1; |
210 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | if (revents & POLLOUT && rpc->outqueue != NULL) { | |
215 | if (rpc_write_to_socket(rpc) != 0) { | |
216 | printf("write to socket failed\n"); | |
217 | return -3; | |
218 | } | |
219 | } | |
220 | ||
221 | if (revents & POLLIN) { | |
222 | if (rpc_read_from_socket(rpc) != 0) { | |
223 | rpc_disconnect(rpc, rpc_get_error(rpc)); | |
224 | return -4; | |
225 | } | |
226 | } | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | ||
232 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) | |
233 | { | |
234 | struct sockaddr_storage s; | |
235 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; | |
236 | int socksize; | |
237 | ||
238 | if (rpc->fd != -1) { | |
239 | rpc_set_error(rpc, "Trying to connect while already connected"); | |
240 | printf("%s\n", rpc->error_string); | |
241 | return -1; | |
242 | } | |
243 | ||
244 | sin->sin_family = AF_INET; | |
245 | sin->sin_port = htons(port); | |
246 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { | |
247 | rpc_set_error(rpc, "Not a valid server ip address"); | |
248 | printf("%s\n", rpc->error_string); | |
249 | return -2; | |
250 | } | |
251 | ||
252 | switch (s.ss_family) { | |
253 | case AF_INET: | |
254 | rpc->fd = socket(AF_INET, SOCK_STREAM, 0); | |
255 | socksize = sizeof(struct sockaddr_in); | |
256 | break; | |
257 | } | |
258 | ||
259 | if (rpc->fd == -1) { | |
260 | rpc_set_error(rpc, "Failed to open socket"); | |
261 | printf("%s\n", rpc->error_string); | |
262 | return -3; | |
263 | } | |
264 | ||
265 | rpc->connect_cb = cb; | |
266 | rpc->connect_data = private_data; | |
267 | ||
268 | set_nonblocking(rpc->fd); | |
269 | ||
270 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) { | |
271 | rpc_set_error(rpc, "connect() to server failed"); | |
272 | printf("%s\n", rpc->error_string); | |
273 | return -4; | |
274 | } | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | int rpc_disconnect(struct rpc_context *rpc, char *error) | |
280 | { | |
281 | if (rpc->fd != -1) { | |
282 | close(rpc->fd); | |
283 | } | |
284 | rpc->fd = -1; | |
285 | ||
286 | rpc->is_connected = 0; | |
287 | ||
288 | rpc_error_all_pdus(rpc, error); | |
289 | ||
290 | return 0; | |
291 | } |