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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 | { | |
46 | int events = POLLIN; | |
47 | ||
48 | if (rpc->is_connected == 0) { | |
49 | events |= POLLOUT; | |
50 | } | |
51 | ||
52 | if (rpc->outqueue) { | |
53 | events |= POLLOUT; | |
54 | } | |
55 | return events; | |
56 | } | |
57 | ||
58 | static int rpc_write_to_socket(struct rpc_context *rpc) | |
59 | { | |
60 | ssize_t count; | |
61 | ||
62 | if (rpc == NULL) { | |
63 | printf("trying to write to socket for NULL context\n"); | |
64 | return -1; | |
65 | } | |
66 | if (rpc->fd == -1) { | |
67 | printf("trying to write but not connected\n"); | |
68 | return -2; | |
69 | } | |
70 | ||
71 | while (rpc->outqueue != NULL) { | |
72 | ssize_t total; | |
73 | ||
74 | total = rpc->outqueue->outdata.size; | |
75 | ||
76 | count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written); | |
77 | if (count == -1) { | |
78 | if (errno == EAGAIN || errno == EWOULDBLOCK) { | |
79 | printf("socket would block, return from write to socket\n"); | |
80 | return 0; | |
81 | } | |
82 | printf("Error when writing to socket :%s(%d)\n", strerror(errno), errno); | |
83 | return -3; | |
84 | } | |
85 | ||
86 | rpc->outqueue->written += count; | |
87 | if (rpc->outqueue->written == total) { | |
88 | struct rpc_pdu *pdu = rpc->outqueue; | |
89 | ||
90 | SLIST_REMOVE(&rpc->outqueue, pdu); | |
91 | SLIST_ADD_END(&rpc->waitpdu, pdu); | |
92 | } | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static int rpc_read_from_socket(struct rpc_context *rpc) | |
98 | { | |
99 | int available; | |
100 | int size; | |
101 | unsigned char *buf; | |
102 | ssize_t count; | |
103 | ||
104 | if (ioctl(rpc->fd, FIONREAD, &available) != 0) { | |
105 | rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno); | |
106 | return -1; | |
107 | } | |
108 | if (available == 0) { | |
109 | rpc_set_error(rpc, "Socket has been closed"); | |
110 | return -2; | |
111 | } | |
112 | size = rpc->insize - rpc->inpos + available; | |
113 | buf = malloc(size); | |
114 | if (buf == NULL) { | |
115 | rpc_set_error(rpc, "Out of memory: failed to allocate %d bytes for input buffer. Closing socket.", size); | |
116 | return -3; | |
117 | } | |
118 | if (rpc->insize > rpc->inpos) { | |
119 | memcpy(buf, rpc->inbuf + rpc->inpos, rpc->insize - rpc->inpos); | |
120 | rpc->insize -= rpc->inpos; | |
121 | rpc->inpos = 0; | |
122 | } | |
123 | ||
124 | count = read(rpc->fd, buf + rpc->insize, available); | |
125 | if (count == -1) { | |
126 | if (errno == EINTR) { | |
127 | free(buf); | |
128 | buf = NULL; | |
129 | return 0; | |
130 | } | |
131 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); | |
132 | free(buf); | |
133 | buf = NULL; | |
134 | return -4; | |
135 | } | |
136 | ||
137 | if (rpc->inbuf != NULL) { | |
138 | free(rpc->inbuf); | |
139 | } | |
140 | rpc->inbuf = (char *)buf; | |
141 | rpc->insize += count; | |
142 | ||
143 | while (1) { | |
144 | if (rpc->insize - rpc->inpos < 4) { | |
145 | return 0; | |
146 | } | |
147 | count = rpc_get_pdu_size(rpc->inbuf + rpc->inpos); | |
148 | if (rpc->insize + rpc->inpos < count) { | |
149 | return 0; | |
150 | } | |
151 | if (rpc_process_pdu(rpc, rpc->inbuf + rpc->inpos, count) != 0) { | |
152 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket"); | |
153 | return -5; | |
154 | } | |
155 | rpc->inpos += count; | |
156 | if (rpc->inpos == rpc->insize) { | |
157 | free(rpc->inbuf); | |
158 | rpc->inbuf = NULL; | |
159 | rpc->insize = 0; | |
160 | rpc->inpos = 0; | |
161 | } | |
162 | } | |
163 | return 0; | |
164 | } | |
165 | ||
166 | ||
167 | ||
168 | int rpc_service(struct rpc_context *rpc, int revents) | |
169 | { | |
170 | if (revents & POLLERR) { | |
171 | printf("rpc_service: POLLERR, socket error\n"); | |
172 | if (rpc->is_connected == 0) { | |
173 | rpc_set_error(rpc, "Failed to connect to server socket."); | |
174 | } else { | |
175 | rpc_set_error(rpc, "Socket closed with POLLERR"); | |
176 | } | |
177 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
178 | return -1; | |
179 | } | |
180 | if (revents & POLLHUP) { | |
181 | printf("rpc_service: POLLHUP, socket error\n"); | |
182 | rpc_set_error(rpc, "Socket failed with POLLHUP"); | |
183 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); | |
184 | return -2; | |
185 | } | |
186 | ||
187 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { | |
188 | rpc->is_connected = 1; | |
189 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | if (revents & POLLOUT && rpc->outqueue != NULL) { | |
194 | if (rpc_write_to_socket(rpc) != 0) { | |
195 | printf("write to socket failed\n"); | |
196 | return -3; | |
197 | } | |
198 | } | |
199 | ||
200 | if (revents & POLLIN) { | |
201 | if (rpc_read_from_socket(rpc) != 0) { | |
202 | rpc_disconnect(rpc, rpc_get_error(rpc)); | |
203 | return -4; | |
204 | } | |
205 | } | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | ||
211 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) | |
212 | { | |
213 | struct sockaddr_storage s; | |
214 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; | |
215 | int socksize; | |
216 | ||
217 | if (rpc->fd != -1) { | |
218 | rpc_set_error(rpc, "Trying to connect while already connected"); | |
219 | printf("%s\n", rpc->error_string); | |
220 | return -1; | |
221 | } | |
222 | ||
223 | sin->sin_family = AF_INET; | |
224 | sin->sin_port = htons(port); | |
225 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { | |
226 | rpc_set_error(rpc, "Not a valid server ip address"); | |
227 | printf("%s\n", rpc->error_string); | |
228 | return -2; | |
229 | } | |
230 | ||
231 | switch (s.ss_family) { | |
232 | case AF_INET: | |
233 | rpc->fd = socket(AF_INET, SOCK_STREAM, 0); | |
234 | socksize = sizeof(struct sockaddr_in); | |
235 | break; | |
236 | } | |
237 | ||
238 | if (rpc->fd == -1) { | |
239 | rpc_set_error(rpc, "Failed to open socket"); | |
240 | printf("%s\n", rpc->error_string); | |
241 | return -3; | |
242 | } | |
243 | ||
244 | rpc->connect_cb = cb; | |
245 | rpc->connect_data = private_data; | |
246 | ||
247 | set_nonblocking(rpc->fd); | |
248 | ||
249 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) { | |
250 | rpc_set_error(rpc, "connect() to server failed"); | |
251 | printf("%s\n", rpc->error_string); | |
252 | return -4; | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | int rpc_disconnect(struct rpc_context *rpc, char *error) | |
259 | { | |
260 | if (rpc->fd != -1) { | |
261 | close(rpc->fd); | |
262 | } | |
263 | rpc->fd = -1; | |
264 | ||
265 | rpc->is_connected = 0; | |
266 | ||
267 | rpc_error_all_pdus(rpc, error); | |
268 | ||
269 | return 0; | |
270 | } |