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1 | 75818250 | ths | /*
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2 | 7a5ca864 | bellard | * Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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3 | 7a5ca864 | bellard | *
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4 | 7a5ca864 | bellard | * Network Block Device
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5 | 7a5ca864 | bellard | *
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6 | 7a5ca864 | bellard | * This program is free software; you can redistribute it and/or modify
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7 | 7a5ca864 | bellard | * it under the terms of the GNU General Public License as published by
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8 | 7a5ca864 | bellard | * the Free Software Foundation; under version 2 of the License.
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9 | 7a5ca864 | bellard | *
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10 | 7a5ca864 | bellard | * This program is distributed in the hope that it will be useful,
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11 | 7a5ca864 | bellard | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | 7a5ca864 | bellard | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | 7a5ca864 | bellard | * GNU General Public License for more details.
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14 | 7a5ca864 | bellard | *
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15 | 7a5ca864 | bellard | * You should have received a copy of the GNU General Public License
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16 | 8167ee88 | Blue Swirl | * along with this program; if not, see <http://www.gnu.org/licenses/>.
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17 | 75818250 | ths | */
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18 | 7a5ca864 | bellard | |
19 | 7a5ca864 | bellard | #include "nbd.h" |
20 | 7a5ca864 | bellard | |
21 | 7a5ca864 | bellard | #include <errno.h> |
22 | 7a5ca864 | bellard | #include <string.h> |
23 | 03ff3ca3 | aliguori | #ifndef _WIN32
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24 | 7a5ca864 | bellard | #include <sys/ioctl.h> |
25 | 03ff3ca3 | aliguori | #endif
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26 | 5dc2eec9 | Andreas Färber | #if defined(__sun__) || defined(__HAIKU__)
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27 | 7e00eb9b | aliguori | #include <sys/ioccom.h> |
28 | 7e00eb9b | aliguori | #endif
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29 | 7a5ca864 | bellard | #include <ctype.h> |
30 | 7a5ca864 | bellard | #include <inttypes.h> |
31 | 75818250 | ths | |
32 | 03ff3ca3 | aliguori | #include "qemu_socket.h" |
33 | 03ff3ca3 | aliguori | |
34 | 03ff3ca3 | aliguori | //#define DEBUG_NBD
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35 | 03ff3ca3 | aliguori | |
36 | 03ff3ca3 | aliguori | #ifdef DEBUG_NBD
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37 | 75818250 | ths | #define TRACE(msg, ...) do { \ |
38 | 03ff3ca3 | aliguori | LOG(msg, ## __VA_ARGS__); \ |
39 | 75818250 | ths | } while(0) |
40 | 03ff3ca3 | aliguori | #else
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41 | 03ff3ca3 | aliguori | #define TRACE(msg, ...) \
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42 | 03ff3ca3 | aliguori | do { } while (0) |
43 | 03ff3ca3 | aliguori | #endif
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44 | 7a5ca864 | bellard | |
45 | 7a5ca864 | bellard | #define LOG(msg, ...) do { \ |
46 | 7a5ca864 | bellard | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
47 | 7a5ca864 | bellard | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
48 | 7a5ca864 | bellard | } while(0) |
49 | 7a5ca864 | bellard | |
50 | 7a5ca864 | bellard | /* This is all part of the "official" NBD API */
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51 | 7a5ca864 | bellard | |
52 | 5fe16888 | Laurent Vivier | #define NBD_REPLY_SIZE (4 + 4 + 8) |
53 | 7a5ca864 | bellard | #define NBD_REQUEST_MAGIC 0x25609513 |
54 | 7a5ca864 | bellard | #define NBD_REPLY_MAGIC 0x67446698 |
55 | 7a5ca864 | bellard | |
56 | 7a5ca864 | bellard | #define NBD_SET_SOCK _IO(0xab, 0) |
57 | 7a5ca864 | bellard | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
58 | 7a5ca864 | bellard | #define NBD_SET_SIZE _IO(0xab, 2) |
59 | 7a5ca864 | bellard | #define NBD_DO_IT _IO(0xab, 3) |
60 | 7a5ca864 | bellard | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
61 | 7a5ca864 | bellard | #define NBD_CLEAR_QUE _IO(0xab, 5) |
62 | 7a5ca864 | bellard | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
63 | 7a5ca864 | bellard | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
64 | 7a5ca864 | bellard | #define NBD_DISCONNECT _IO(0xab, 8) |
65 | 7a5ca864 | bellard | |
66 | 1d45f8b5 | Laurent Vivier | #define NBD_OPT_EXPORT_NAME (1 << 0) |
67 | 1d45f8b5 | Laurent Vivier | |
68 | 7a5ca864 | bellard | /* That's all folks */
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69 | 7a5ca864 | bellard | |
70 | 75818250 | ths | #define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true) |
71 | 75818250 | ths | #define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false) |
72 | 7a5ca864 | bellard | |
73 | 75818250 | ths | size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
74 | 7a5ca864 | bellard | { |
75 | 7a5ca864 | bellard | size_t offset = 0;
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76 | 7a5ca864 | bellard | |
77 | 7a5ca864 | bellard | while (offset < size) {
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78 | 7a5ca864 | bellard | ssize_t len; |
79 | 7a5ca864 | bellard | |
80 | 7a5ca864 | bellard | if (do_read) {
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81 | 03ff3ca3 | aliguori | len = recv(fd, buffer + offset, size - offset, 0);
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82 | 7a5ca864 | bellard | } else {
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83 | 03ff3ca3 | aliguori | len = send(fd, buffer + offset, size - offset, 0);
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84 | 7a5ca864 | bellard | } |
85 | 7a5ca864 | bellard | |
86 | 03ff3ca3 | aliguori | if (len == -1) |
87 | 03ff3ca3 | aliguori | errno = socket_error(); |
88 | 03ff3ca3 | aliguori | |
89 | 7a5ca864 | bellard | /* recoverable error */
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90 | 75818250 | ths | if (len == -1 && (errno == EAGAIN || errno == EINTR)) { |
91 | 7a5ca864 | bellard | continue;
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92 | 7a5ca864 | bellard | } |
93 | 7a5ca864 | bellard | |
94 | 7a5ca864 | bellard | /* eof */
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95 | 7a5ca864 | bellard | if (len == 0) { |
96 | 7a5ca864 | bellard | break;
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97 | 7a5ca864 | bellard | } |
98 | 7a5ca864 | bellard | |
99 | 7a5ca864 | bellard | /* unrecoverable error */
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100 | 7a5ca864 | bellard | if (len == -1) { |
101 | 7a5ca864 | bellard | return 0; |
102 | 7a5ca864 | bellard | } |
103 | 7a5ca864 | bellard | |
104 | 7a5ca864 | bellard | offset += len; |
105 | 7a5ca864 | bellard | } |
106 | 7a5ca864 | bellard | |
107 | 7a5ca864 | bellard | return offset;
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108 | 7a5ca864 | bellard | } |
109 | 7a5ca864 | bellard | |
110 | 75818250 | ths | int tcp_socket_outgoing(const char *address, uint16_t port) |
111 | 7a5ca864 | bellard | { |
112 | 7a5ca864 | bellard | int s;
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113 | 7a5ca864 | bellard | struct in_addr in;
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114 | 7a5ca864 | bellard | struct sockaddr_in addr;
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115 | 7a5ca864 | bellard | |
116 | 7a5ca864 | bellard | s = socket(PF_INET, SOCK_STREAM, 0);
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117 | 7a5ca864 | bellard | if (s == -1) { |
118 | 7a5ca864 | bellard | return -1; |
119 | 7a5ca864 | bellard | } |
120 | 7a5ca864 | bellard | |
121 | 7a5ca864 | bellard | if (inet_aton(address, &in) == 0) { |
122 | 7a5ca864 | bellard | struct hostent *ent;
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123 | 7a5ca864 | bellard | |
124 | 7a5ca864 | bellard | ent = gethostbyname(address); |
125 | 7a5ca864 | bellard | if (ent == NULL) { |
126 | 7a5ca864 | bellard | goto error;
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127 | 7a5ca864 | bellard | } |
128 | 7a5ca864 | bellard | |
129 | 7a5ca864 | bellard | memcpy(&in, ent->h_addr, sizeof(in));
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130 | 7a5ca864 | bellard | } |
131 | 7a5ca864 | bellard | |
132 | 7a5ca864 | bellard | addr.sin_family = AF_INET; |
133 | 7a5ca864 | bellard | addr.sin_port = htons(port); |
134 | 7a5ca864 | bellard | memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
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135 | 7a5ca864 | bellard | |
136 | 7a5ca864 | bellard | if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
137 | 7a5ca864 | bellard | goto error;
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138 | 7a5ca864 | bellard | } |
139 | 7a5ca864 | bellard | |
140 | 7a5ca864 | bellard | return s;
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141 | 7a5ca864 | bellard | error:
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142 | 03ff3ca3 | aliguori | closesocket(s); |
143 | 7a5ca864 | bellard | return -1; |
144 | 7a5ca864 | bellard | } |
145 | 7a5ca864 | bellard | |
146 | 7a5ca864 | bellard | int tcp_socket_incoming(const char *address, uint16_t port) |
147 | 7a5ca864 | bellard | { |
148 | 7a5ca864 | bellard | int s;
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149 | 7a5ca864 | bellard | struct in_addr in;
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150 | 7a5ca864 | bellard | struct sockaddr_in addr;
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151 | 7a5ca864 | bellard | int opt;
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152 | 7a5ca864 | bellard | |
153 | 7a5ca864 | bellard | s = socket(PF_INET, SOCK_STREAM, 0);
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154 | 7a5ca864 | bellard | if (s == -1) { |
155 | 7a5ca864 | bellard | return -1; |
156 | 7a5ca864 | bellard | } |
157 | 7a5ca864 | bellard | |
158 | 7a5ca864 | bellard | if (inet_aton(address, &in) == 0) { |
159 | 7a5ca864 | bellard | struct hostent *ent;
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160 | 7a5ca864 | bellard | |
161 | 7a5ca864 | bellard | ent = gethostbyname(address); |
162 | 7a5ca864 | bellard | if (ent == NULL) { |
163 | 7a5ca864 | bellard | goto error;
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164 | 7a5ca864 | bellard | } |
165 | 7a5ca864 | bellard | |
166 | 7a5ca864 | bellard | memcpy(&in, ent->h_addr, sizeof(in));
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167 | 7a5ca864 | bellard | } |
168 | 7a5ca864 | bellard | |
169 | 7a5ca864 | bellard | addr.sin_family = AF_INET; |
170 | 7a5ca864 | bellard | addr.sin_port = htons(port); |
171 | 7a5ca864 | bellard | memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
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172 | 7a5ca864 | bellard | |
173 | 7a5ca864 | bellard | opt = 1;
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174 | 0a656f5f | malc | if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
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175 | 0a656f5f | malc | (const void *) &opt, sizeof(opt)) == -1) { |
176 | 7a5ca864 | bellard | goto error;
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177 | 7a5ca864 | bellard | } |
178 | 7a5ca864 | bellard | |
179 | 7a5ca864 | bellard | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
180 | 7a5ca864 | bellard | goto error;
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181 | 7a5ca864 | bellard | } |
182 | 7a5ca864 | bellard | |
183 | 7a5ca864 | bellard | if (listen(s, 128) == -1) { |
184 | 7a5ca864 | bellard | goto error;
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185 | 7a5ca864 | bellard | } |
186 | 7a5ca864 | bellard | |
187 | 7a5ca864 | bellard | return s;
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188 | 7a5ca864 | bellard | error:
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189 | 03ff3ca3 | aliguori | closesocket(s); |
190 | 7a5ca864 | bellard | return -1; |
191 | 7a5ca864 | bellard | } |
192 | 7a5ca864 | bellard | |
193 | 03ff3ca3 | aliguori | #ifndef _WIN32
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194 | cd831bd7 | ths | int unix_socket_incoming(const char *path) |
195 | cd831bd7 | ths | { |
196 | cd831bd7 | ths | int s;
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197 | cd831bd7 | ths | struct sockaddr_un addr;
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198 | cd831bd7 | ths | |
199 | cd831bd7 | ths | s = socket(PF_UNIX, SOCK_STREAM, 0);
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200 | cd831bd7 | ths | if (s == -1) { |
201 | cd831bd7 | ths | return -1; |
202 | cd831bd7 | ths | } |
203 | cd831bd7 | ths | |
204 | cd831bd7 | ths | memset(&addr, 0, sizeof(addr)); |
205 | cd831bd7 | ths | addr.sun_family = AF_UNIX; |
206 | cd831bd7 | ths | pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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207 | cd831bd7 | ths | |
208 | cd831bd7 | ths | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
209 | cd831bd7 | ths | goto error;
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210 | cd831bd7 | ths | } |
211 | cd831bd7 | ths | |
212 | cd831bd7 | ths | if (listen(s, 128) == -1) { |
213 | cd831bd7 | ths | goto error;
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214 | cd831bd7 | ths | } |
215 | cd831bd7 | ths | |
216 | cd831bd7 | ths | return s;
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217 | cd831bd7 | ths | error:
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218 | 03ff3ca3 | aliguori | closesocket(s); |
219 | cd831bd7 | ths | return -1; |
220 | cd831bd7 | ths | } |
221 | cd831bd7 | ths | |
222 | cd831bd7 | ths | int unix_socket_outgoing(const char *path) |
223 | cd831bd7 | ths | { |
224 | cd831bd7 | ths | int s;
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225 | cd831bd7 | ths | struct sockaddr_un addr;
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226 | cd831bd7 | ths | |
227 | cd831bd7 | ths | s = socket(PF_UNIX, SOCK_STREAM, 0);
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228 | cd831bd7 | ths | if (s == -1) { |
229 | cd831bd7 | ths | return -1; |
230 | cd831bd7 | ths | } |
231 | cd831bd7 | ths | |
232 | cd831bd7 | ths | memset(&addr, 0, sizeof(addr)); |
233 | cd831bd7 | ths | addr.sun_family = AF_UNIX; |
234 | cd831bd7 | ths | pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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235 | cd831bd7 | ths | |
236 | cd831bd7 | ths | if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
237 | cd831bd7 | ths | goto error;
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238 | cd831bd7 | ths | } |
239 | cd831bd7 | ths | |
240 | cd831bd7 | ths | return s;
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241 | cd831bd7 | ths | error:
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242 | 03ff3ca3 | aliguori | closesocket(s); |
243 | 03ff3ca3 | aliguori | return -1; |
244 | 03ff3ca3 | aliguori | } |
245 | 03ff3ca3 | aliguori | #else
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246 | 03ff3ca3 | aliguori | int unix_socket_incoming(const char *path) |
247 | 03ff3ca3 | aliguori | { |
248 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
249 | cd831bd7 | ths | return -1; |
250 | cd831bd7 | ths | } |
251 | cd831bd7 | ths | |
252 | 03ff3ca3 | aliguori | int unix_socket_outgoing(const char *path) |
253 | 03ff3ca3 | aliguori | { |
254 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
255 | 03ff3ca3 | aliguori | return -1; |
256 | 03ff3ca3 | aliguori | } |
257 | 03ff3ca3 | aliguori | #endif
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258 | 03ff3ca3 | aliguori | |
259 | cd831bd7 | ths | |
260 | 7a5ca864 | bellard | /* Basic flow
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261 | 7a5ca864 | bellard | |
262 | 7a5ca864 | bellard | Server Client
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263 | 7a5ca864 | bellard | |
264 | 7a5ca864 | bellard | Negotiate
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265 | 7a5ca864 | bellard | Request
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266 | 7a5ca864 | bellard | Response
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267 | 7a5ca864 | bellard | Request
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268 | 7a5ca864 | bellard | Response
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269 | 7a5ca864 | bellard | ...
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270 | 7a5ca864 | bellard | ...
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271 | 7a5ca864 | bellard | Request (type == 2)
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272 | 7a5ca864 | bellard | */
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273 | 7a5ca864 | bellard | |
274 | 27982661 | aliguori | int nbd_negotiate(int csock, off_t size) |
275 | 7a5ca864 | bellard | { |
276 | 7a5ca864 | bellard | char buf[8 + 8 + 8 + 128]; |
277 | 7a5ca864 | bellard | |
278 | 7a5ca864 | bellard | /* Negotiate
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279 | 7a5ca864 | bellard | [ 0 .. 7] passwd ("NBDMAGIC")
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280 | 7a5ca864 | bellard | [ 8 .. 15] magic (0x00420281861253)
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281 | 7a5ca864 | bellard | [16 .. 23] size
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282 | 7a5ca864 | bellard | [24 .. 151] reserved (0)
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283 | 7a5ca864 | bellard | */
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284 | 7a5ca864 | bellard | |
285 | 7a5ca864 | bellard | TRACE("Beginning negotiation.");
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286 | 7a5ca864 | bellard | memcpy(buf, "NBDMAGIC", 8); |
287 | 7a5ca864 | bellard | cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
288 | 7a5ca864 | bellard | cpu_to_be64w((uint64_t*)(buf + 16), size);
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289 | 7a5ca864 | bellard | memset(buf + 24, 0, 128); |
290 | 7a5ca864 | bellard | |
291 | 7a5ca864 | bellard | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
292 | 7a5ca864 | bellard | LOG("write failed");
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293 | 7a5ca864 | bellard | errno = EINVAL; |
294 | 7a5ca864 | bellard | return -1; |
295 | 7a5ca864 | bellard | } |
296 | 7a5ca864 | bellard | |
297 | 7a5ca864 | bellard | TRACE("Negotation succeeded.");
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298 | 7a5ca864 | bellard | |
299 | 7a5ca864 | bellard | return 0; |
300 | 7a5ca864 | bellard | } |
301 | 7a5ca864 | bellard | |
302 | 1d45f8b5 | Laurent Vivier | int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
303 | 1d45f8b5 | Laurent Vivier | off_t *size, size_t *blocksize) |
304 | 7a5ca864 | bellard | { |
305 | 1d45f8b5 | Laurent Vivier | char buf[256]; |
306 | 1d45f8b5 | Laurent Vivier | uint64_t magic, s; |
307 | 1d45f8b5 | Laurent Vivier | uint16_t tmp; |
308 | 7a5ca864 | bellard | |
309 | 7a5ca864 | bellard | TRACE("Receiving negotation.");
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310 | 7a5ca864 | bellard | |
311 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, buf, 8) != 8) { |
312 | 7a5ca864 | bellard | LOG("read failed");
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313 | 7a5ca864 | bellard | errno = EINVAL; |
314 | 7a5ca864 | bellard | return -1; |
315 | 7a5ca864 | bellard | } |
316 | 7a5ca864 | bellard | |
317 | 1d45f8b5 | Laurent Vivier | buf[8] = '\0'; |
318 | 1d45f8b5 | Laurent Vivier | if (strlen(buf) == 0) { |
319 | 1d45f8b5 | Laurent Vivier | LOG("server connection closed");
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320 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
321 | 1d45f8b5 | Laurent Vivier | return -1; |
322 | 1d45f8b5 | Laurent Vivier | } |
323 | 7a5ca864 | bellard | |
324 | 7a5ca864 | bellard | TRACE("Magic is %c%c%c%c%c%c%c%c",
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325 | 47398b9c | blueswir1 | qemu_isprint(buf[0]) ? buf[0] : '.', |
326 | 47398b9c | blueswir1 | qemu_isprint(buf[1]) ? buf[1] : '.', |
327 | 47398b9c | blueswir1 | qemu_isprint(buf[2]) ? buf[2] : '.', |
328 | 47398b9c | blueswir1 | qemu_isprint(buf[3]) ? buf[3] : '.', |
329 | 47398b9c | blueswir1 | qemu_isprint(buf[4]) ? buf[4] : '.', |
330 | 47398b9c | blueswir1 | qemu_isprint(buf[5]) ? buf[5] : '.', |
331 | 47398b9c | blueswir1 | qemu_isprint(buf[6]) ? buf[6] : '.', |
332 | 47398b9c | blueswir1 | qemu_isprint(buf[7]) ? buf[7] : '.'); |
333 | 7a5ca864 | bellard | |
334 | 7a5ca864 | bellard | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
335 | 7a5ca864 | bellard | LOG("Invalid magic received");
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336 | 7a5ca864 | bellard | errno = EINVAL; |
337 | 7a5ca864 | bellard | return -1; |
338 | 7a5ca864 | bellard | } |
339 | 7a5ca864 | bellard | |
340 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
341 | 1d45f8b5 | Laurent Vivier | LOG("read failed");
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342 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
343 | 1d45f8b5 | Laurent Vivier | return -1; |
344 | 1d45f8b5 | Laurent Vivier | } |
345 | 1d45f8b5 | Laurent Vivier | magic = be64_to_cpu(magic); |
346 | 1d45f8b5 | Laurent Vivier | TRACE("Magic is 0x%" PRIx64, magic);
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347 | 1d45f8b5 | Laurent Vivier | |
348 | 1d45f8b5 | Laurent Vivier | if (name) {
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349 | 1d45f8b5 | Laurent Vivier | uint32_t reserved = 0;
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350 | 1d45f8b5 | Laurent Vivier | uint32_t opt; |
351 | 1d45f8b5 | Laurent Vivier | uint32_t namesize; |
352 | 1d45f8b5 | Laurent Vivier | |
353 | 1d45f8b5 | Laurent Vivier | TRACE("Checking magic (opts_magic)");
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354 | 1d45f8b5 | Laurent Vivier | if (magic != 0x49484156454F5054LL) { |
355 | 1d45f8b5 | Laurent Vivier | LOG("Bad magic received");
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356 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
357 | 1d45f8b5 | Laurent Vivier | return -1; |
358 | 1d45f8b5 | Laurent Vivier | } |
359 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
360 | 1d45f8b5 | Laurent Vivier | LOG("flags read failed");
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361 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
362 | 1d45f8b5 | Laurent Vivier | return -1; |
363 | 1d45f8b5 | Laurent Vivier | } |
364 | 1d45f8b5 | Laurent Vivier | *flags = be16_to_cpu(tmp) << 16;
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365 | 1d45f8b5 | Laurent Vivier | /* reserved for future use */
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366 | 1d45f8b5 | Laurent Vivier | if (write_sync(csock, &reserved, sizeof(reserved)) != |
367 | 1d45f8b5 | Laurent Vivier | sizeof(reserved)) {
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368 | 1d45f8b5 | Laurent Vivier | LOG("write failed (reserved)");
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369 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
370 | 1d45f8b5 | Laurent Vivier | return -1; |
371 | 1d45f8b5 | Laurent Vivier | } |
372 | 1d45f8b5 | Laurent Vivier | /* write the export name */
|
373 | 1d45f8b5 | Laurent Vivier | magic = cpu_to_be64(magic); |
374 | 1d45f8b5 | Laurent Vivier | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
375 | 1d45f8b5 | Laurent Vivier | LOG("write failed (magic)");
|
376 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
377 | 1d45f8b5 | Laurent Vivier | return -1; |
378 | 1d45f8b5 | Laurent Vivier | } |
379 | 1d45f8b5 | Laurent Vivier | opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); |
380 | 1d45f8b5 | Laurent Vivier | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
381 | 1d45f8b5 | Laurent Vivier | LOG("write failed (opt)");
|
382 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
383 | 1d45f8b5 | Laurent Vivier | return -1; |
384 | 1d45f8b5 | Laurent Vivier | } |
385 | 1d45f8b5 | Laurent Vivier | namesize = cpu_to_be32(strlen(name)); |
386 | 1d45f8b5 | Laurent Vivier | if (write_sync(csock, &namesize, sizeof(namesize)) != |
387 | 1d45f8b5 | Laurent Vivier | sizeof(namesize)) {
|
388 | 1d45f8b5 | Laurent Vivier | LOG("write failed (namesize)");
|
389 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
390 | 1d45f8b5 | Laurent Vivier | return -1; |
391 | 1d45f8b5 | Laurent Vivier | } |
392 | 1d45f8b5 | Laurent Vivier | if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { |
393 | 1d45f8b5 | Laurent Vivier | LOG("write failed (name)");
|
394 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
395 | 1d45f8b5 | Laurent Vivier | return -1; |
396 | 1d45f8b5 | Laurent Vivier | } |
397 | 1d45f8b5 | Laurent Vivier | } else {
|
398 | 1d45f8b5 | Laurent Vivier | TRACE("Checking magic (cli_magic)");
|
399 | 1d45f8b5 | Laurent Vivier | |
400 | 1d45f8b5 | Laurent Vivier | if (magic != 0x00420281861253LL) { |
401 | 1d45f8b5 | Laurent Vivier | LOG("Bad magic received");
|
402 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
403 | 1d45f8b5 | Laurent Vivier | return -1; |
404 | 1d45f8b5 | Laurent Vivier | } |
405 | 1d45f8b5 | Laurent Vivier | } |
406 | 7a5ca864 | bellard | |
407 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { |
408 | 1d45f8b5 | Laurent Vivier | LOG("read failed");
|
409 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
410 | 1d45f8b5 | Laurent Vivier | return -1; |
411 | 1d45f8b5 | Laurent Vivier | } |
412 | 1d45f8b5 | Laurent Vivier | *size = be64_to_cpu(s); |
413 | 1d45f8b5 | Laurent Vivier | *blocksize = 1024;
|
414 | 1d45f8b5 | Laurent Vivier | TRACE("Size is %" PRIu64, *size);
|
415 | 1d45f8b5 | Laurent Vivier | |
416 | 1d45f8b5 | Laurent Vivier | if (!name) {
|
417 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { |
418 | 1d45f8b5 | Laurent Vivier | LOG("read failed (flags)");
|
419 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
420 | 1d45f8b5 | Laurent Vivier | return -1; |
421 | 1d45f8b5 | Laurent Vivier | } |
422 | 1d45f8b5 | Laurent Vivier | *flags = be32_to_cpup(flags); |
423 | 1d45f8b5 | Laurent Vivier | } else {
|
424 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
425 | 1d45f8b5 | Laurent Vivier | LOG("read failed (tmp)");
|
426 | 1d45f8b5 | Laurent Vivier | errno = EINVAL; |
427 | 1d45f8b5 | Laurent Vivier | return -1; |
428 | 1d45f8b5 | Laurent Vivier | } |
429 | 1d45f8b5 | Laurent Vivier | *flags |= be32_to_cpu(tmp); |
430 | 1d45f8b5 | Laurent Vivier | } |
431 | 1d45f8b5 | Laurent Vivier | if (read_sync(csock, &buf, 124) != 124) { |
432 | 1d45f8b5 | Laurent Vivier | LOG("read failed (buf)");
|
433 | 7a5ca864 | bellard | errno = EINVAL; |
434 | 7a5ca864 | bellard | return -1; |
435 | 7a5ca864 | bellard | } |
436 | cd831bd7 | ths | return 0; |
437 | cd831bd7 | ths | } |
438 | 7a5ca864 | bellard | |
439 | 03ff3ca3 | aliguori | #ifndef _WIN32
|
440 | cd831bd7 | ths | int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
441 | cd831bd7 | ths | { |
442 | 7a5ca864 | bellard | TRACE("Setting block size to %lu", (unsigned long)blocksize); |
443 | 7a5ca864 | bellard | |
444 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
445 | 7a5ca864 | bellard | int serrno = errno;
|
446 | 7a5ca864 | bellard | LOG("Failed setting NBD block size");
|
447 | 7a5ca864 | bellard | errno = serrno; |
448 | 7a5ca864 | bellard | return -1; |
449 | 7a5ca864 | bellard | } |
450 | 7a5ca864 | bellard | |
451 | 0bfcd599 | Blue Swirl | TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize));
|
452 | 7a5ca864 | bellard | |
453 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
454 | 7a5ca864 | bellard | int serrno = errno;
|
455 | 7a5ca864 | bellard | LOG("Failed setting size (in blocks)");
|
456 | 7a5ca864 | bellard | errno = serrno; |
457 | 7a5ca864 | bellard | return -1; |
458 | 7a5ca864 | bellard | } |
459 | 7a5ca864 | bellard | |
460 | 7a5ca864 | bellard | TRACE("Clearing NBD socket");
|
461 | 7a5ca864 | bellard | |
462 | 7a5ca864 | bellard | if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
463 | 7a5ca864 | bellard | int serrno = errno;
|
464 | 7a5ca864 | bellard | LOG("Failed clearing NBD socket");
|
465 | 7a5ca864 | bellard | errno = serrno; |
466 | 7a5ca864 | bellard | return -1; |
467 | 7a5ca864 | bellard | } |
468 | 7a5ca864 | bellard | |
469 | 7a5ca864 | bellard | TRACE("Setting NBD socket");
|
470 | 7a5ca864 | bellard | |
471 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
472 | 7a5ca864 | bellard | int serrno = errno;
|
473 | 7a5ca864 | bellard | LOG("Failed to set NBD socket");
|
474 | 7a5ca864 | bellard | errno = serrno; |
475 | 7a5ca864 | bellard | return -1; |
476 | 7a5ca864 | bellard | } |
477 | 7a5ca864 | bellard | |
478 | 7a5ca864 | bellard | TRACE("Negotiation ended");
|
479 | 7a5ca864 | bellard | |
480 | 7a5ca864 | bellard | return 0; |
481 | 7a5ca864 | bellard | } |
482 | 7a5ca864 | bellard | |
483 | 7a5ca864 | bellard | int nbd_disconnect(int fd) |
484 | 7a5ca864 | bellard | { |
485 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_QUE); |
486 | 7a5ca864 | bellard | ioctl(fd, NBD_DISCONNECT); |
487 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_SOCK); |
488 | 7a5ca864 | bellard | return 0; |
489 | 7a5ca864 | bellard | } |
490 | 7a5ca864 | bellard | |
491 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
492 | 7a5ca864 | bellard | { |
493 | 7a5ca864 | bellard | int ret;
|
494 | 7a5ca864 | bellard | int serrno;
|
495 | 7a5ca864 | bellard | |
496 | 7a5ca864 | bellard | TRACE("Doing NBD loop");
|
497 | 7a5ca864 | bellard | |
498 | 7a5ca864 | bellard | ret = ioctl(fd, NBD_DO_IT); |
499 | 7a5ca864 | bellard | serrno = errno; |
500 | 7a5ca864 | bellard | |
501 | 7a5ca864 | bellard | TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
502 | 7a5ca864 | bellard | |
503 | 7a5ca864 | bellard | TRACE("Clearing NBD queue");
|
504 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_QUE); |
505 | 7a5ca864 | bellard | |
506 | 7a5ca864 | bellard | TRACE("Clearing NBD socket");
|
507 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_SOCK); |
508 | 7a5ca864 | bellard | |
509 | 7a5ca864 | bellard | errno = serrno; |
510 | 7a5ca864 | bellard | return ret;
|
511 | 7a5ca864 | bellard | } |
512 | 03ff3ca3 | aliguori | #else
|
513 | 03ff3ca3 | aliguori | int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
514 | 03ff3ca3 | aliguori | { |
515 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
516 | 03ff3ca3 | aliguori | return -1; |
517 | 03ff3ca3 | aliguori | } |
518 | 03ff3ca3 | aliguori | |
519 | 03ff3ca3 | aliguori | int nbd_disconnect(int fd) |
520 | 03ff3ca3 | aliguori | { |
521 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
522 | 03ff3ca3 | aliguori | return -1; |
523 | 03ff3ca3 | aliguori | } |
524 | 03ff3ca3 | aliguori | |
525 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
526 | 03ff3ca3 | aliguori | { |
527 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
528 | 03ff3ca3 | aliguori | return -1; |
529 | 03ff3ca3 | aliguori | } |
530 | 03ff3ca3 | aliguori | #endif
|
531 | 7a5ca864 | bellard | |
532 | 75818250 | ths | int nbd_send_request(int csock, struct nbd_request *request) |
533 | 7a5ca864 | bellard | { |
534 | 7a5ca864 | bellard | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
535 | 7a5ca864 | bellard | |
536 | 75818250 | ths | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
537 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
538 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
539 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
540 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
541 | 75818250 | ths | |
542 | 75818250 | ths | TRACE("Sending request to client");
|
543 | 75818250 | ths | |
544 | 75818250 | ths | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
545 | 75818250 | ths | LOG("writing to socket failed");
|
546 | 75818250 | ths | errno = EINVAL; |
547 | 75818250 | ths | return -1; |
548 | 75818250 | ths | } |
549 | 75818250 | ths | return 0; |
550 | 75818250 | ths | } |
551 | 75818250 | ths | |
552 | 75818250 | ths | |
553 | 75818250 | ths | static int nbd_receive_request(int csock, struct nbd_request *request) |
554 | 75818250 | ths | { |
555 | 75818250 | ths | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
556 | 75818250 | ths | uint32_t magic; |
557 | 7a5ca864 | bellard | |
558 | 7a5ca864 | bellard | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
559 | 7a5ca864 | bellard | LOG("read failed");
|
560 | 7a5ca864 | bellard | errno = EINVAL; |
561 | 7a5ca864 | bellard | return -1; |
562 | 7a5ca864 | bellard | } |
563 | 7a5ca864 | bellard | |
564 | 7a5ca864 | bellard | /* Request
|
565 | 75818250 | ths | [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
566 | 75818250 | ths | [ 4 .. 7] type (0 == READ, 1 == WRITE)
|
567 | 75818250 | ths | [ 8 .. 15] handle
|
568 | 75818250 | ths | [16 .. 23] from
|
569 | 75818250 | ths | [24 .. 27] len
|
570 | 7a5ca864 | bellard | */
|
571 | 7a5ca864 | bellard | |
572 | 7a5ca864 | bellard | magic = be32_to_cpup((uint32_t*)buf); |
573 | 75818250 | ths | request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
574 | 75818250 | ths | request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
575 | 75818250 | ths | request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
576 | 75818250 | ths | request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
577 | 7a5ca864 | bellard | |
578 | 7a5ca864 | bellard | TRACE("Got request: "
|
579 | 7a5ca864 | bellard | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
580 | 75818250 | ths | magic, request->type, request->from, request->len); |
581 | 7a5ca864 | bellard | |
582 | 7a5ca864 | bellard | if (magic != NBD_REQUEST_MAGIC) {
|
583 | 7a5ca864 | bellard | LOG("invalid magic (got 0x%x)", magic);
|
584 | 7a5ca864 | bellard | errno = EINVAL; |
585 | 7a5ca864 | bellard | return -1; |
586 | 7a5ca864 | bellard | } |
587 | d94888e3 | malc | return 0; |
588 | 75818250 | ths | } |
589 | 75818250 | ths | |
590 | 75818250 | ths | int nbd_receive_reply(int csock, struct nbd_reply *reply) |
591 | 75818250 | ths | { |
592 | 5fe16888 | Laurent Vivier | uint8_t buf[NBD_REPLY_SIZE]; |
593 | 75818250 | ths | uint32_t magic; |
594 | 75818250 | ths | |
595 | 75818250 | ths | memset(buf, 0xAA, sizeof(buf)); |
596 | 75818250 | ths | |
597 | 75818250 | ths | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
598 | 75818250 | ths | LOG("read failed");
|
599 | 75818250 | ths | errno = EINVAL; |
600 | 75818250 | ths | return -1; |
601 | 75818250 | ths | } |
602 | 75818250 | ths | |
603 | 75818250 | ths | /* Reply
|
604 | 75818250 | ths | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
605 | 75818250 | ths | [ 4 .. 7] error (0 == no error)
|
606 | 75818250 | ths | [ 7 .. 15] handle
|
607 | 75818250 | ths | */
|
608 | 75818250 | ths | |
609 | 75818250 | ths | magic = be32_to_cpup((uint32_t*)buf); |
610 | 75818250 | ths | reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
611 | 75818250 | ths | reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
612 | 75818250 | ths | |
613 | 75818250 | ths | TRACE("Got reply: "
|
614 | 75818250 | ths | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
615 | 75818250 | ths | magic, reply->error, reply->handle); |
616 | 75818250 | ths | |
617 | 75818250 | ths | if (magic != NBD_REPLY_MAGIC) {
|
618 | 75818250 | ths | LOG("invalid magic (got 0x%x)", magic);
|
619 | 75818250 | ths | errno = EINVAL; |
620 | 75818250 | ths | return -1; |
621 | 75818250 | ths | } |
622 | 75818250 | ths | return 0; |
623 | 75818250 | ths | } |
624 | 75818250 | ths | |
625 | 75818250 | ths | static int nbd_send_reply(int csock, struct nbd_reply *reply) |
626 | 75818250 | ths | { |
627 | 75818250 | ths | uint8_t buf[4 + 4 + 8]; |
628 | 75818250 | ths | |
629 | 75818250 | ths | /* Reply
|
630 | 75818250 | ths | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
631 | 75818250 | ths | [ 4 .. 7] error (0 == no error)
|
632 | 75818250 | ths | [ 7 .. 15] handle
|
633 | 75818250 | ths | */
|
634 | 75818250 | ths | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
635 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
636 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
637 | 75818250 | ths | |
638 | 75818250 | ths | TRACE("Sending response to client");
|
639 | 75818250 | ths | |
640 | 75818250 | ths | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
641 | 75818250 | ths | LOG("writing to socket failed");
|
642 | 75818250 | ths | errno = EINVAL; |
643 | 75818250 | ths | return -1; |
644 | 75818250 | ths | } |
645 | 75818250 | ths | return 0; |
646 | 75818250 | ths | } |
647 | 7a5ca864 | bellard | |
648 | 75818250 | ths | int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
649 | 75818250 | ths | off_t *offset, bool readonly, uint8_t *data, int data_size) |
650 | 75818250 | ths | { |
651 | 75818250 | ths | struct nbd_request request;
|
652 | 75818250 | ths | struct nbd_reply reply;
|
653 | 75818250 | ths | |
654 | 75818250 | ths | TRACE("Reading request.");
|
655 | 75818250 | ths | |
656 | 75818250 | ths | if (nbd_receive_request(csock, &request) == -1) |
657 | 75818250 | ths | return -1; |
658 | 75818250 | ths | |
659 | 5fe16888 | Laurent Vivier | if (request.len + NBD_REPLY_SIZE > data_size) {
|
660 | 2f726488 | ths | LOG("len (%u) is larger than max len (%u)",
|
661 | 5fe16888 | Laurent Vivier | request.len + NBD_REPLY_SIZE, data_size); |
662 | 7a5ca864 | bellard | errno = EINVAL; |
663 | 7a5ca864 | bellard | return -1; |
664 | 7a5ca864 | bellard | } |
665 | 7a5ca864 | bellard | |
666 | 75818250 | ths | if ((request.from + request.len) < request.from) {
|
667 | 7a5ca864 | bellard | LOG("integer overflow detected! "
|
668 | 7a5ca864 | bellard | "you're probably being attacked");
|
669 | 7a5ca864 | bellard | errno = EINVAL; |
670 | 7a5ca864 | bellard | return -1; |
671 | 7a5ca864 | bellard | } |
672 | 7a5ca864 | bellard | |
673 | 75818250 | ths | if ((request.from + request.len) > size) {
|
674 | 7a5ca864 | bellard | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
675 | 7a5ca864 | bellard | ", Offset: %" PRIu64 "\n", |
676 | b9e82a59 | blueswir1 | request.from, request.len, (uint64_t)size, dev_offset); |
677 | 7a5ca864 | bellard | LOG("requested operation past EOF--bad client?");
|
678 | 7a5ca864 | bellard | errno = EINVAL; |
679 | 7a5ca864 | bellard | return -1; |
680 | 7a5ca864 | bellard | } |
681 | 7a5ca864 | bellard | |
682 | 7a5ca864 | bellard | TRACE("Decoding type");
|
683 | 7a5ca864 | bellard | |
684 | 75818250 | ths | reply.handle = request.handle; |
685 | 75818250 | ths | reply.error = 0;
|
686 | 75818250 | ths | |
687 | 75818250 | ths | switch (request.type) {
|
688 | 75818250 | ths | case NBD_CMD_READ:
|
689 | 7a5ca864 | bellard | TRACE("Request type is READ");
|
690 | 7a5ca864 | bellard | |
691 | 5fe16888 | Laurent Vivier | if (bdrv_read(bs, (request.from + dev_offset) / 512, |
692 | 5fe16888 | Laurent Vivier | data + NBD_REPLY_SIZE, |
693 | 75818250 | ths | request.len / 512) == -1) { |
694 | 7a5ca864 | bellard | LOG("reading from file failed");
|
695 | 7a5ca864 | bellard | errno = EINVAL; |
696 | 7a5ca864 | bellard | return -1; |
697 | 7a5ca864 | bellard | } |
698 | 75818250 | ths | *offset += request.len; |
699 | 7a5ca864 | bellard | |
700 | 75818250 | ths | TRACE("Read %u byte(s)", request.len);
|
701 | 7a5ca864 | bellard | |
702 | 5fe16888 | Laurent Vivier | /* Reply
|
703 | 5fe16888 | Laurent Vivier | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
704 | 5fe16888 | Laurent Vivier | [ 4 .. 7] error (0 == no error)
|
705 | 5fe16888 | Laurent Vivier | [ 7 .. 15] handle
|
706 | 5fe16888 | Laurent Vivier | */
|
707 | 5fe16888 | Laurent Vivier | |
708 | 5fe16888 | Laurent Vivier | cpu_to_be32w((uint32_t*)data, NBD_REPLY_MAGIC); |
709 | 5fe16888 | Laurent Vivier | cpu_to_be32w((uint32_t*)(data + 4), reply.error);
|
710 | 5fe16888 | Laurent Vivier | cpu_to_be64w((uint64_t*)(data + 8), reply.handle);
|
711 | 7a5ca864 | bellard | |
712 | 7a5ca864 | bellard | TRACE("Sending data to client");
|
713 | 7a5ca864 | bellard | |
714 | 5fe16888 | Laurent Vivier | if (write_sync(csock, data,
|
715 | 5fe16888 | Laurent Vivier | request.len + NBD_REPLY_SIZE) != |
716 | 5fe16888 | Laurent Vivier | request.len + NBD_REPLY_SIZE) { |
717 | 7a5ca864 | bellard | LOG("writing to socket failed");
|
718 | 7a5ca864 | bellard | errno = EINVAL; |
719 | 7a5ca864 | bellard | return -1; |
720 | 7a5ca864 | bellard | } |
721 | 7a5ca864 | bellard | break;
|
722 | 75818250 | ths | case NBD_CMD_WRITE:
|
723 | 7a5ca864 | bellard | TRACE("Request type is WRITE");
|
724 | 7a5ca864 | bellard | |
725 | 75818250 | ths | TRACE("Reading %u byte(s)", request.len);
|
726 | 7a5ca864 | bellard | |
727 | 75818250 | ths | if (read_sync(csock, data, request.len) != request.len) {
|
728 | 7a5ca864 | bellard | LOG("reading from socket failed");
|
729 | 7a5ca864 | bellard | errno = EINVAL; |
730 | 7a5ca864 | bellard | return -1; |
731 | 7a5ca864 | bellard | } |
732 | 7a5ca864 | bellard | |
733 | 7a5ca864 | bellard | if (readonly) {
|
734 | 7a5ca864 | bellard | TRACE("Server is read-only, return error");
|
735 | 75818250 | ths | reply.error = 1;
|
736 | 7a5ca864 | bellard | } else {
|
737 | 7a5ca864 | bellard | TRACE("Writing to device");
|
738 | 7a5ca864 | bellard | |
739 | 75818250 | ths | if (bdrv_write(bs, (request.from + dev_offset) / 512, |
740 | 75818250 | ths | data, request.len / 512) == -1) { |
741 | 7a5ca864 | bellard | LOG("writing to file failed");
|
742 | 7a5ca864 | bellard | errno = EINVAL; |
743 | 7a5ca864 | bellard | return -1; |
744 | 7a5ca864 | bellard | } |
745 | 7a5ca864 | bellard | |
746 | 75818250 | ths | *offset += request.len; |
747 | 7a5ca864 | bellard | } |
748 | 7a5ca864 | bellard | |
749 | 75818250 | ths | if (nbd_send_reply(csock, &reply) == -1) |
750 | 7a5ca864 | bellard | return -1; |
751 | 7a5ca864 | bellard | break;
|
752 | 75818250 | ths | case NBD_CMD_DISC:
|
753 | 7a5ca864 | bellard | TRACE("Request type is DISCONNECT");
|
754 | 7a5ca864 | bellard | errno = 0;
|
755 | 7a5ca864 | bellard | return 1; |
756 | 7a5ca864 | bellard | default:
|
757 | 75818250 | ths | LOG("invalid request type (%u) received", request.type);
|
758 | 7a5ca864 | bellard | errno = EINVAL; |
759 | 7a5ca864 | bellard | return -1; |
760 | 7a5ca864 | bellard | } |
761 | 7a5ca864 | bellard | |
762 | 7a5ca864 | bellard | TRACE("Request/Reply complete");
|
763 | 7a5ca864 | bellard | |
764 | 7a5ca864 | bellard | return 0; |
765 | 7a5ca864 | bellard | } |