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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 | 7a5ca864 | bellard | * along with this program; if not, write to the Free Software
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17 | 7a5ca864 | bellard | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 | 75818250 | ths | */
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19 | 7a5ca864 | bellard | |
20 | 7a5ca864 | bellard | #include "nbd.h" |
21 | 7a5ca864 | bellard | |
22 | 7a5ca864 | bellard | #include <errno.h> |
23 | 7a5ca864 | bellard | #include <string.h> |
24 | 7a5ca864 | bellard | #include <sys/ioctl.h> |
25 | 7e00eb9b | aliguori | #ifdef __sun__
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26 | 7e00eb9b | aliguori | #include <sys/ioccom.h> |
27 | 7e00eb9b | aliguori | #endif
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28 | 7a5ca864 | bellard | #include <ctype.h> |
29 | 7a5ca864 | bellard | #include <inttypes.h> |
30 | 7a5ca864 | bellard | #include <sys/socket.h> |
31 | cd831bd7 | ths | #include <sys/un.h> |
32 | 7a5ca864 | bellard | #include <netinet/in.h> |
33 | 7a5ca864 | bellard | #include <netinet/tcp.h> |
34 | 7a5ca864 | bellard | #include <arpa/inet.h> |
35 | 7a5ca864 | bellard | #include <netdb.h> |
36 | 7a5ca864 | bellard | |
37 | 75818250 | ths | #if defined(QEMU_NBD)
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38 | 7a5ca864 | bellard | extern int verbose; |
39 | 75818250 | ths | #else
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40 | 75818250 | ths | static int verbose = 0; |
41 | 75818250 | ths | #endif
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42 | 75818250 | ths | |
43 | 75818250 | ths | #define TRACE(msg, ...) do { \ |
44 | 75818250 | ths | if (verbose) LOG(msg, ## __VA_ARGS__); \ |
45 | 75818250 | ths | } while(0) |
46 | 7a5ca864 | bellard | |
47 | 7a5ca864 | bellard | #define LOG(msg, ...) do { \ |
48 | 7a5ca864 | bellard | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
49 | 7a5ca864 | bellard | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
50 | 7a5ca864 | bellard | } while(0) |
51 | 7a5ca864 | bellard | |
52 | 7a5ca864 | bellard | /* This is all part of the "official" NBD API */
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53 | 7a5ca864 | bellard | |
54 | 7a5ca864 | bellard | #define NBD_REQUEST_MAGIC 0x25609513 |
55 | 7a5ca864 | bellard | #define NBD_REPLY_MAGIC 0x67446698 |
56 | 7a5ca864 | bellard | |
57 | 7a5ca864 | bellard | #define NBD_SET_SOCK _IO(0xab, 0) |
58 | 7a5ca864 | bellard | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
59 | 7a5ca864 | bellard | #define NBD_SET_SIZE _IO(0xab, 2) |
60 | 7a5ca864 | bellard | #define NBD_DO_IT _IO(0xab, 3) |
61 | 7a5ca864 | bellard | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
62 | 7a5ca864 | bellard | #define NBD_CLEAR_QUE _IO(0xab, 5) |
63 | 7a5ca864 | bellard | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
64 | 7a5ca864 | bellard | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
65 | 7a5ca864 | bellard | #define NBD_DISCONNECT _IO(0xab, 8) |
66 | 7a5ca864 | bellard | |
67 | 7a5ca864 | bellard | /* That's all folks */
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68 | 7a5ca864 | bellard | |
69 | 75818250 | ths | #define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true) |
70 | 75818250 | ths | #define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false) |
71 | 7a5ca864 | bellard | |
72 | 75818250 | ths | size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
73 | 7a5ca864 | bellard | { |
74 | 7a5ca864 | bellard | size_t offset = 0;
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75 | 7a5ca864 | bellard | |
76 | 7a5ca864 | bellard | while (offset < size) {
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77 | 7a5ca864 | bellard | ssize_t len; |
78 | 7a5ca864 | bellard | |
79 | 7a5ca864 | bellard | if (do_read) {
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80 | 7a5ca864 | bellard | len = read(fd, buffer + offset, size - offset); |
81 | 7a5ca864 | bellard | } else {
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82 | 7a5ca864 | bellard | len = write(fd, buffer + offset, size - offset); |
83 | 7a5ca864 | bellard | } |
84 | 7a5ca864 | bellard | |
85 | 7a5ca864 | bellard | /* recoverable error */
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86 | 75818250 | ths | if (len == -1 && (errno == EAGAIN || errno == EINTR)) { |
87 | 7a5ca864 | bellard | continue;
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88 | 7a5ca864 | bellard | } |
89 | 7a5ca864 | bellard | |
90 | 7a5ca864 | bellard | /* eof */
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91 | 7a5ca864 | bellard | if (len == 0) { |
92 | 7a5ca864 | bellard | break;
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93 | 7a5ca864 | bellard | } |
94 | 7a5ca864 | bellard | |
95 | 7a5ca864 | bellard | /* unrecoverable error */
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96 | 7a5ca864 | bellard | if (len == -1) { |
97 | 7a5ca864 | bellard | return 0; |
98 | 7a5ca864 | bellard | } |
99 | 7a5ca864 | bellard | |
100 | 7a5ca864 | bellard | offset += len; |
101 | 7a5ca864 | bellard | } |
102 | 7a5ca864 | bellard | |
103 | 7a5ca864 | bellard | return offset;
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104 | 7a5ca864 | bellard | } |
105 | 7a5ca864 | bellard | |
106 | 75818250 | ths | int tcp_socket_outgoing(const char *address, uint16_t port) |
107 | 7a5ca864 | bellard | { |
108 | 7a5ca864 | bellard | int s;
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109 | 7a5ca864 | bellard | struct in_addr in;
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110 | 7a5ca864 | bellard | struct sockaddr_in addr;
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111 | 7a5ca864 | bellard | int serrno;
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112 | 7a5ca864 | bellard | |
113 | 7a5ca864 | bellard | s = socket(PF_INET, SOCK_STREAM, 0);
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114 | 7a5ca864 | bellard | if (s == -1) { |
115 | 7a5ca864 | bellard | return -1; |
116 | 7a5ca864 | bellard | } |
117 | 7a5ca864 | bellard | |
118 | 7a5ca864 | bellard | if (inet_aton(address, &in) == 0) { |
119 | 7a5ca864 | bellard | struct hostent *ent;
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120 | 7a5ca864 | bellard | |
121 | 7a5ca864 | bellard | ent = gethostbyname(address); |
122 | 7a5ca864 | bellard | if (ent == NULL) { |
123 | 7a5ca864 | bellard | goto error;
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124 | 7a5ca864 | bellard | } |
125 | 7a5ca864 | bellard | |
126 | 7a5ca864 | bellard | memcpy(&in, ent->h_addr, sizeof(in));
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127 | 7a5ca864 | bellard | } |
128 | 7a5ca864 | bellard | |
129 | 7a5ca864 | bellard | addr.sin_family = AF_INET; |
130 | 7a5ca864 | bellard | addr.sin_port = htons(port); |
131 | 7a5ca864 | bellard | memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
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132 | 7a5ca864 | bellard | |
133 | 7a5ca864 | bellard | if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
134 | 7a5ca864 | bellard | goto error;
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135 | 7a5ca864 | bellard | } |
136 | 7a5ca864 | bellard | |
137 | 7a5ca864 | bellard | return s;
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138 | 7a5ca864 | bellard | error:
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139 | 7a5ca864 | bellard | serrno = errno; |
140 | 7a5ca864 | bellard | close(s); |
141 | 7a5ca864 | bellard | errno = serrno; |
142 | 7a5ca864 | bellard | return -1; |
143 | 7a5ca864 | bellard | } |
144 | 7a5ca864 | bellard | |
145 | 7a5ca864 | bellard | int tcp_socket_incoming(const char *address, uint16_t port) |
146 | 7a5ca864 | bellard | { |
147 | 7a5ca864 | bellard | int s;
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148 | 7a5ca864 | bellard | struct in_addr in;
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149 | 7a5ca864 | bellard | struct sockaddr_in addr;
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150 | 7a5ca864 | bellard | int serrno;
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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 | 7a5ca864 | bellard | if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1) { |
175 | 7a5ca864 | bellard | goto error;
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176 | 7a5ca864 | bellard | } |
177 | 7a5ca864 | bellard | |
178 | 7a5ca864 | bellard | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
179 | 7a5ca864 | bellard | goto error;
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180 | 7a5ca864 | bellard | } |
181 | 7a5ca864 | bellard | |
182 | 7a5ca864 | bellard | if (listen(s, 128) == -1) { |
183 | 7a5ca864 | bellard | goto error;
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184 | 7a5ca864 | bellard | } |
185 | 7a5ca864 | bellard | |
186 | 7a5ca864 | bellard | return s;
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187 | 7a5ca864 | bellard | error:
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188 | 7a5ca864 | bellard | serrno = errno; |
189 | 7a5ca864 | bellard | close(s); |
190 | 7a5ca864 | bellard | errno = serrno; |
191 | 7a5ca864 | bellard | return -1; |
192 | 7a5ca864 | bellard | } |
193 | 7a5ca864 | bellard | |
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 | int serrno;
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199 | cd831bd7 | ths | |
200 | cd831bd7 | ths | s = socket(PF_UNIX, SOCK_STREAM, 0);
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201 | cd831bd7 | ths | if (s == -1) { |
202 | cd831bd7 | ths | return -1; |
203 | cd831bd7 | ths | } |
204 | cd831bd7 | ths | |
205 | cd831bd7 | ths | memset(&addr, 0, sizeof(addr)); |
206 | cd831bd7 | ths | addr.sun_family = AF_UNIX; |
207 | cd831bd7 | ths | pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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208 | cd831bd7 | ths | |
209 | cd831bd7 | ths | if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
210 | cd831bd7 | ths | goto error;
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211 | cd831bd7 | ths | } |
212 | cd831bd7 | ths | |
213 | cd831bd7 | ths | if (listen(s, 128) == -1) { |
214 | cd831bd7 | ths | goto error;
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215 | cd831bd7 | ths | } |
216 | cd831bd7 | ths | |
217 | cd831bd7 | ths | return s;
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218 | cd831bd7 | ths | error:
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219 | cd831bd7 | ths | serrno = errno; |
220 | cd831bd7 | ths | close(s); |
221 | cd831bd7 | ths | errno = serrno; |
222 | cd831bd7 | ths | return -1; |
223 | cd831bd7 | ths | } |
224 | cd831bd7 | ths | |
225 | cd831bd7 | ths | int unix_socket_outgoing(const char *path) |
226 | cd831bd7 | ths | { |
227 | cd831bd7 | ths | int s;
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228 | cd831bd7 | ths | struct sockaddr_un addr;
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229 | cd831bd7 | ths | int serrno;
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230 | cd831bd7 | ths | |
231 | cd831bd7 | ths | s = socket(PF_UNIX, SOCK_STREAM, 0);
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232 | cd831bd7 | ths | if (s == -1) { |
233 | cd831bd7 | ths | return -1; |
234 | cd831bd7 | ths | } |
235 | cd831bd7 | ths | |
236 | cd831bd7 | ths | memset(&addr, 0, sizeof(addr)); |
237 | cd831bd7 | ths | addr.sun_family = AF_UNIX; |
238 | cd831bd7 | ths | pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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239 | cd831bd7 | ths | |
240 | cd831bd7 | ths | if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
241 | cd831bd7 | ths | goto error;
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242 | cd831bd7 | ths | } |
243 | cd831bd7 | ths | |
244 | cd831bd7 | ths | return s;
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245 | cd831bd7 | ths | error:
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246 | cd831bd7 | ths | serrno = errno; |
247 | cd831bd7 | ths | close(s); |
248 | cd831bd7 | ths | errno = serrno; |
249 | cd831bd7 | ths | return -1; |
250 | cd831bd7 | ths | } |
251 | cd831bd7 | ths | |
252 | cd831bd7 | ths | |
253 | 7a5ca864 | bellard | /* Basic flow
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254 | 7a5ca864 | bellard | |
255 | 7a5ca864 | bellard | Server Client
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256 | 7a5ca864 | bellard | |
257 | 7a5ca864 | bellard | Negotiate
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258 | 7a5ca864 | bellard | Request
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259 | 7a5ca864 | bellard | Response
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260 | 7a5ca864 | bellard | Request
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261 | 7a5ca864 | bellard | Response
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262 | 7a5ca864 | bellard | ...
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263 | 7a5ca864 | bellard | ...
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264 | 7a5ca864 | bellard | Request (type == 2)
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265 | 7a5ca864 | bellard | */
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266 | 7a5ca864 | bellard | |
267 | 7a5ca864 | bellard | int nbd_negotiate(BlockDriverState *bs, int csock, off_t size) |
268 | 7a5ca864 | bellard | { |
269 | 7a5ca864 | bellard | char buf[8 + 8 + 8 + 128]; |
270 | 7a5ca864 | bellard | |
271 | 7a5ca864 | bellard | /* Negotiate
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272 | 7a5ca864 | bellard | [ 0 .. 7] passwd ("NBDMAGIC")
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273 | 7a5ca864 | bellard | [ 8 .. 15] magic (0x00420281861253)
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274 | 7a5ca864 | bellard | [16 .. 23] size
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275 | 7a5ca864 | bellard | [24 .. 151] reserved (0)
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276 | 7a5ca864 | bellard | */
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277 | 7a5ca864 | bellard | |
278 | 7a5ca864 | bellard | TRACE("Beginning negotiation.");
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279 | 7a5ca864 | bellard | memcpy(buf, "NBDMAGIC", 8); |
280 | 7a5ca864 | bellard | cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
281 | 7a5ca864 | bellard | cpu_to_be64w((uint64_t*)(buf + 16), size);
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282 | 7a5ca864 | bellard | memset(buf + 24, 0, 128); |
283 | 7a5ca864 | bellard | |
284 | 7a5ca864 | bellard | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
285 | 7a5ca864 | bellard | LOG("write failed");
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286 | 7a5ca864 | bellard | errno = EINVAL; |
287 | 7a5ca864 | bellard | return -1; |
288 | 7a5ca864 | bellard | } |
289 | 7a5ca864 | bellard | |
290 | 7a5ca864 | bellard | TRACE("Negotation succeeded.");
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291 | 7a5ca864 | bellard | |
292 | 7a5ca864 | bellard | return 0; |
293 | 7a5ca864 | bellard | } |
294 | 7a5ca864 | bellard | |
295 | cd831bd7 | ths | int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize) |
296 | 7a5ca864 | bellard | { |
297 | 7a5ca864 | bellard | char buf[8 + 8 + 8 + 128]; |
298 | 7a5ca864 | bellard | uint64_t magic; |
299 | 7a5ca864 | bellard | |
300 | 7a5ca864 | bellard | TRACE("Receiving negotation.");
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301 | 7a5ca864 | bellard | |
302 | 7a5ca864 | bellard | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
303 | 7a5ca864 | bellard | LOG("read failed");
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304 | 7a5ca864 | bellard | errno = EINVAL; |
305 | 7a5ca864 | bellard | return -1; |
306 | 7a5ca864 | bellard | } |
307 | 7a5ca864 | bellard | |
308 | 7a5ca864 | bellard | magic = be64_to_cpup((uint64_t*)(buf + 8));
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309 | cd831bd7 | ths | *size = be64_to_cpup((uint64_t*)(buf + 16));
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310 | cd831bd7 | ths | *blocksize = 1024;
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311 | 7a5ca864 | bellard | |
312 | 7a5ca864 | bellard | TRACE("Magic is %c%c%c%c%c%c%c%c",
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313 | 7a5ca864 | bellard | isprint(buf[0]) ? buf[0] : '.', |
314 | 7a5ca864 | bellard | isprint(buf[1]) ? buf[1] : '.', |
315 | 7a5ca864 | bellard | isprint(buf[2]) ? buf[2] : '.', |
316 | 7a5ca864 | bellard | isprint(buf[3]) ? buf[3] : '.', |
317 | 7a5ca864 | bellard | isprint(buf[4]) ? buf[4] : '.', |
318 | 7a5ca864 | bellard | isprint(buf[5]) ? buf[5] : '.', |
319 | 7a5ca864 | bellard | isprint(buf[6]) ? buf[6] : '.', |
320 | 7a5ca864 | bellard | isprint(buf[7]) ? buf[7] : '.'); |
321 | 7a5ca864 | bellard | TRACE("Magic is 0x%" PRIx64, magic);
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322 | cd831bd7 | ths | TRACE("Size is %" PRIu64, *size);
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323 | 7a5ca864 | bellard | |
324 | 7a5ca864 | bellard | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
325 | 7a5ca864 | bellard | LOG("Invalid magic received");
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326 | 7a5ca864 | bellard | errno = EINVAL; |
327 | 7a5ca864 | bellard | return -1; |
328 | 7a5ca864 | bellard | } |
329 | 7a5ca864 | bellard | |
330 | 7a5ca864 | bellard | TRACE("Checking magic");
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331 | 7a5ca864 | bellard | |
332 | 7a5ca864 | bellard | if (magic != 0x00420281861253LL) { |
333 | 7a5ca864 | bellard | LOG("Bad magic received");
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334 | 7a5ca864 | bellard | errno = EINVAL; |
335 | 7a5ca864 | bellard | return -1; |
336 | 7a5ca864 | bellard | } |
337 | cd831bd7 | ths | return 0; |
338 | cd831bd7 | ths | } |
339 | 7a5ca864 | bellard | |
340 | cd831bd7 | ths | int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
341 | cd831bd7 | ths | { |
342 | 7a5ca864 | bellard | TRACE("Setting block size to %lu", (unsigned long)blocksize); |
343 | 7a5ca864 | bellard | |
344 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
345 | 7a5ca864 | bellard | int serrno = errno;
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346 | 7a5ca864 | bellard | LOG("Failed setting NBD block size");
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347 | 7a5ca864 | bellard | errno = serrno; |
348 | 7a5ca864 | bellard | return -1; |
349 | 7a5ca864 | bellard | } |
350 | 7a5ca864 | bellard | |
351 | 7a5ca864 | bellard | TRACE("Setting size to %llu block(s)",
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352 | 7a5ca864 | bellard | (unsigned long long)(size / blocksize)); |
353 | 7a5ca864 | bellard | |
354 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
355 | 7a5ca864 | bellard | int serrno = errno;
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356 | 7a5ca864 | bellard | LOG("Failed setting size (in blocks)");
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357 | 7a5ca864 | bellard | errno = serrno; |
358 | 7a5ca864 | bellard | return -1; |
359 | 7a5ca864 | bellard | } |
360 | 7a5ca864 | bellard | |
361 | 7a5ca864 | bellard | TRACE("Clearing NBD socket");
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362 | 7a5ca864 | bellard | |
363 | 7a5ca864 | bellard | if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
364 | 7a5ca864 | bellard | int serrno = errno;
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365 | 7a5ca864 | bellard | LOG("Failed clearing NBD socket");
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366 | 7a5ca864 | bellard | errno = serrno; |
367 | 7a5ca864 | bellard | return -1; |
368 | 7a5ca864 | bellard | } |
369 | 7a5ca864 | bellard | |
370 | 7a5ca864 | bellard | TRACE("Setting NBD socket");
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371 | 7a5ca864 | bellard | |
372 | 7a5ca864 | bellard | if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
373 | 7a5ca864 | bellard | int serrno = errno;
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374 | 7a5ca864 | bellard | LOG("Failed to set NBD socket");
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375 | 7a5ca864 | bellard | errno = serrno; |
376 | 7a5ca864 | bellard | return -1; |
377 | 7a5ca864 | bellard | } |
378 | 7a5ca864 | bellard | |
379 | 7a5ca864 | bellard | TRACE("Negotiation ended");
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380 | 7a5ca864 | bellard | |
381 | 7a5ca864 | bellard | return 0; |
382 | 7a5ca864 | bellard | } |
383 | 7a5ca864 | bellard | |
384 | 7a5ca864 | bellard | int nbd_disconnect(int fd) |
385 | 7a5ca864 | bellard | { |
386 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_QUE); |
387 | 7a5ca864 | bellard | ioctl(fd, NBD_DISCONNECT); |
388 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_SOCK); |
389 | 7a5ca864 | bellard | return 0; |
390 | 7a5ca864 | bellard | } |
391 | 7a5ca864 | bellard | |
392 | 7a5ca864 | bellard | int nbd_client(int fd, int csock) |
393 | 7a5ca864 | bellard | { |
394 | 7a5ca864 | bellard | int ret;
|
395 | 7a5ca864 | bellard | int serrno;
|
396 | 7a5ca864 | bellard | |
397 | 7a5ca864 | bellard | TRACE("Doing NBD loop");
|
398 | 7a5ca864 | bellard | |
399 | 7a5ca864 | bellard | ret = ioctl(fd, NBD_DO_IT); |
400 | 7a5ca864 | bellard | serrno = errno; |
401 | 7a5ca864 | bellard | |
402 | 7a5ca864 | bellard | TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
403 | 7a5ca864 | bellard | |
404 | 7a5ca864 | bellard | TRACE("Clearing NBD queue");
|
405 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_QUE); |
406 | 7a5ca864 | bellard | |
407 | 7a5ca864 | bellard | TRACE("Clearing NBD socket");
|
408 | 7a5ca864 | bellard | ioctl(fd, NBD_CLEAR_SOCK); |
409 | 7a5ca864 | bellard | |
410 | 7a5ca864 | bellard | errno = serrno; |
411 | 7a5ca864 | bellard | return ret;
|
412 | 7a5ca864 | bellard | } |
413 | 7a5ca864 | bellard | |
414 | 75818250 | ths | int nbd_send_request(int csock, struct nbd_request *request) |
415 | 7a5ca864 | bellard | { |
416 | 7a5ca864 | bellard | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
417 | 7a5ca864 | bellard | |
418 | 75818250 | ths | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
419 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
420 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
421 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
422 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
423 | 75818250 | ths | |
424 | 75818250 | ths | TRACE("Sending request to client");
|
425 | 75818250 | ths | |
426 | 75818250 | ths | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
427 | 75818250 | ths | LOG("writing to socket failed");
|
428 | 75818250 | ths | errno = EINVAL; |
429 | 75818250 | ths | return -1; |
430 | 75818250 | ths | } |
431 | 75818250 | ths | return 0; |
432 | 75818250 | ths | } |
433 | 75818250 | ths | |
434 | 75818250 | ths | |
435 | 75818250 | ths | static int nbd_receive_request(int csock, struct nbd_request *request) |
436 | 75818250 | ths | { |
437 | 75818250 | ths | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
438 | 75818250 | ths | uint32_t magic; |
439 | 7a5ca864 | bellard | |
440 | 7a5ca864 | bellard | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
441 | 7a5ca864 | bellard | LOG("read failed");
|
442 | 7a5ca864 | bellard | errno = EINVAL; |
443 | 7a5ca864 | bellard | return -1; |
444 | 7a5ca864 | bellard | } |
445 | 7a5ca864 | bellard | |
446 | 7a5ca864 | bellard | /* Request
|
447 | 75818250 | ths | [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
448 | 75818250 | ths | [ 4 .. 7] type (0 == READ, 1 == WRITE)
|
449 | 75818250 | ths | [ 8 .. 15] handle
|
450 | 75818250 | ths | [16 .. 23] from
|
451 | 75818250 | ths | [24 .. 27] len
|
452 | 7a5ca864 | bellard | */
|
453 | 7a5ca864 | bellard | |
454 | 7a5ca864 | bellard | magic = be32_to_cpup((uint32_t*)buf); |
455 | 75818250 | ths | request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
456 | 75818250 | ths | request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
457 | 75818250 | ths | request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
458 | 75818250 | ths | request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
459 | 7a5ca864 | bellard | |
460 | 7a5ca864 | bellard | TRACE("Got request: "
|
461 | 7a5ca864 | bellard | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
462 | 75818250 | ths | magic, request->type, request->from, request->len); |
463 | 7a5ca864 | bellard | |
464 | 7a5ca864 | bellard | if (magic != NBD_REQUEST_MAGIC) {
|
465 | 7a5ca864 | bellard | LOG("invalid magic (got 0x%x)", magic);
|
466 | 7a5ca864 | bellard | errno = EINVAL; |
467 | 7a5ca864 | bellard | return -1; |
468 | 7a5ca864 | bellard | } |
469 | d94888e3 | malc | return 0; |
470 | 75818250 | ths | } |
471 | 75818250 | ths | |
472 | 75818250 | ths | int nbd_receive_reply(int csock, struct nbd_reply *reply) |
473 | 75818250 | ths | { |
474 | 75818250 | ths | uint8_t buf[4 + 4 + 8]; |
475 | 75818250 | ths | uint32_t magic; |
476 | 75818250 | ths | |
477 | 75818250 | ths | memset(buf, 0xAA, sizeof(buf)); |
478 | 75818250 | ths | |
479 | 75818250 | ths | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
480 | 75818250 | ths | LOG("read failed");
|
481 | 75818250 | ths | errno = EINVAL; |
482 | 75818250 | ths | return -1; |
483 | 75818250 | ths | } |
484 | 75818250 | ths | |
485 | 75818250 | ths | /* Reply
|
486 | 75818250 | ths | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
487 | 75818250 | ths | [ 4 .. 7] error (0 == no error)
|
488 | 75818250 | ths | [ 7 .. 15] handle
|
489 | 75818250 | ths | */
|
490 | 75818250 | ths | |
491 | 75818250 | ths | magic = be32_to_cpup((uint32_t*)buf); |
492 | 75818250 | ths | reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
493 | 75818250 | ths | reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
494 | 75818250 | ths | |
495 | 75818250 | ths | TRACE("Got reply: "
|
496 | 75818250 | ths | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
497 | 75818250 | ths | magic, reply->error, reply->handle); |
498 | 75818250 | ths | |
499 | 75818250 | ths | if (magic != NBD_REPLY_MAGIC) {
|
500 | 75818250 | ths | LOG("invalid magic (got 0x%x)", magic);
|
501 | 75818250 | ths | errno = EINVAL; |
502 | 75818250 | ths | return -1; |
503 | 75818250 | ths | } |
504 | 75818250 | ths | return 0; |
505 | 75818250 | ths | } |
506 | 75818250 | ths | |
507 | 75818250 | ths | static int nbd_send_reply(int csock, struct nbd_reply *reply) |
508 | 75818250 | ths | { |
509 | 75818250 | ths | uint8_t buf[4 + 4 + 8]; |
510 | 75818250 | ths | |
511 | 75818250 | ths | /* Reply
|
512 | 75818250 | ths | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
513 | 75818250 | ths | [ 4 .. 7] error (0 == no error)
|
514 | 75818250 | ths | [ 7 .. 15] handle
|
515 | 75818250 | ths | */
|
516 | 75818250 | ths | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
517 | 75818250 | ths | cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
518 | 75818250 | ths | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
519 | 75818250 | ths | |
520 | 75818250 | ths | TRACE("Sending response to client");
|
521 | 75818250 | ths | |
522 | 75818250 | ths | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
523 | 75818250 | ths | LOG("writing to socket failed");
|
524 | 75818250 | ths | errno = EINVAL; |
525 | 75818250 | ths | return -1; |
526 | 75818250 | ths | } |
527 | 75818250 | ths | return 0; |
528 | 75818250 | ths | } |
529 | 7a5ca864 | bellard | |
530 | 75818250 | ths | int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
531 | 75818250 | ths | off_t *offset, bool readonly, uint8_t *data, int data_size) |
532 | 75818250 | ths | { |
533 | 75818250 | ths | struct nbd_request request;
|
534 | 75818250 | ths | struct nbd_reply reply;
|
535 | 75818250 | ths | |
536 | 75818250 | ths | TRACE("Reading request.");
|
537 | 75818250 | ths | |
538 | 75818250 | ths | if (nbd_receive_request(csock, &request) == -1) |
539 | 75818250 | ths | return -1; |
540 | 75818250 | ths | |
541 | 75818250 | ths | if (request.len > data_size) {
|
542 | 2f726488 | ths | LOG("len (%u) is larger than max len (%u)",
|
543 | 75818250 | ths | request.len, data_size); |
544 | 7a5ca864 | bellard | errno = EINVAL; |
545 | 7a5ca864 | bellard | return -1; |
546 | 7a5ca864 | bellard | } |
547 | 7a5ca864 | bellard | |
548 | 75818250 | ths | if ((request.from + request.len) < request.from) {
|
549 | 7a5ca864 | bellard | LOG("integer overflow detected! "
|
550 | 7a5ca864 | bellard | "you're probably being attacked");
|
551 | 7a5ca864 | bellard | errno = EINVAL; |
552 | 7a5ca864 | bellard | return -1; |
553 | 7a5ca864 | bellard | } |
554 | 7a5ca864 | bellard | |
555 | 75818250 | ths | if ((request.from + request.len) > size) {
|
556 | 7a5ca864 | bellard | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
557 | 7a5ca864 | bellard | ", Offset: %" PRIu64 "\n", |
558 | 75818250 | ths | request.from, request.len, size, dev_offset); |
559 | 7a5ca864 | bellard | LOG("requested operation past EOF--bad client?");
|
560 | 7a5ca864 | bellard | errno = EINVAL; |
561 | 7a5ca864 | bellard | return -1; |
562 | 7a5ca864 | bellard | } |
563 | 7a5ca864 | bellard | |
564 | 7a5ca864 | bellard | TRACE("Decoding type");
|
565 | 7a5ca864 | bellard | |
566 | 75818250 | ths | reply.handle = request.handle; |
567 | 75818250 | ths | reply.error = 0;
|
568 | 75818250 | ths | |
569 | 75818250 | ths | switch (request.type) {
|
570 | 75818250 | ths | case NBD_CMD_READ:
|
571 | 7a5ca864 | bellard | TRACE("Request type is READ");
|
572 | 7a5ca864 | bellard | |
573 | 75818250 | ths | if (bdrv_read(bs, (request.from + dev_offset) / 512, data, |
574 | 75818250 | ths | request.len / 512) == -1) { |
575 | 7a5ca864 | bellard | LOG("reading from file failed");
|
576 | 7a5ca864 | bellard | errno = EINVAL; |
577 | 7a5ca864 | bellard | return -1; |
578 | 7a5ca864 | bellard | } |
579 | 75818250 | ths | *offset += request.len; |
580 | 7a5ca864 | bellard | |
581 | 75818250 | ths | TRACE("Read %u byte(s)", request.len);
|
582 | 7a5ca864 | bellard | |
583 | 75818250 | ths | if (nbd_send_reply(csock, &reply) == -1) |
584 | 7a5ca864 | bellard | return -1; |
585 | 7a5ca864 | bellard | |
586 | 7a5ca864 | bellard | TRACE("Sending data to client");
|
587 | 7a5ca864 | bellard | |
588 | 75818250 | ths | if (write_sync(csock, data, request.len) != request.len) {
|
589 | 7a5ca864 | bellard | LOG("writing to socket failed");
|
590 | 7a5ca864 | bellard | errno = EINVAL; |
591 | 7a5ca864 | bellard | return -1; |
592 | 7a5ca864 | bellard | } |
593 | 7a5ca864 | bellard | break;
|
594 | 75818250 | ths | case NBD_CMD_WRITE:
|
595 | 7a5ca864 | bellard | TRACE("Request type is WRITE");
|
596 | 7a5ca864 | bellard | |
597 | 75818250 | ths | TRACE("Reading %u byte(s)", request.len);
|
598 | 7a5ca864 | bellard | |
599 | 75818250 | ths | if (read_sync(csock, data, request.len) != request.len) {
|
600 | 7a5ca864 | bellard | LOG("reading from socket failed");
|
601 | 7a5ca864 | bellard | errno = EINVAL; |
602 | 7a5ca864 | bellard | return -1; |
603 | 7a5ca864 | bellard | } |
604 | 7a5ca864 | bellard | |
605 | 7a5ca864 | bellard | if (readonly) {
|
606 | 7a5ca864 | bellard | TRACE("Server is read-only, return error");
|
607 | 75818250 | ths | reply.error = 1;
|
608 | 7a5ca864 | bellard | } else {
|
609 | 7a5ca864 | bellard | TRACE("Writing to device");
|
610 | 7a5ca864 | bellard | |
611 | 75818250 | ths | if (bdrv_write(bs, (request.from + dev_offset) / 512, |
612 | 75818250 | ths | data, request.len / 512) == -1) { |
613 | 7a5ca864 | bellard | LOG("writing to file failed");
|
614 | 7a5ca864 | bellard | errno = EINVAL; |
615 | 7a5ca864 | bellard | return -1; |
616 | 7a5ca864 | bellard | } |
617 | 7a5ca864 | bellard | |
618 | 75818250 | ths | *offset += request.len; |
619 | 7a5ca864 | bellard | } |
620 | 7a5ca864 | bellard | |
621 | 75818250 | ths | if (nbd_send_reply(csock, &reply) == -1) |
622 | 7a5ca864 | bellard | return -1; |
623 | 7a5ca864 | bellard | break;
|
624 | 75818250 | ths | case NBD_CMD_DISC:
|
625 | 7a5ca864 | bellard | TRACE("Request type is DISCONNECT");
|
626 | 7a5ca864 | bellard | errno = 0;
|
627 | 7a5ca864 | bellard | return 1; |
628 | 7a5ca864 | bellard | default:
|
629 | 75818250 | ths | LOG("invalid request type (%u) received", request.type);
|
630 | 7a5ca864 | bellard | errno = EINVAL; |
631 | 7a5ca864 | bellard | return -1; |
632 | 7a5ca864 | bellard | } |
633 | 7a5ca864 | bellard | |
634 | 7a5ca864 | bellard | TRACE("Request/Reply complete");
|
635 | 7a5ca864 | bellard | |
636 | 7a5ca864 | bellard | return 0; |
637 | 7a5ca864 | bellard | } |