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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 | ab359cd1 | Markus Armbruster | #include "block.h" |
21 | 7a5ca864 | bellard | |
22 | 7a5ca864 | bellard | #include <errno.h> |
23 | 7a5ca864 | bellard | #include <string.h> |
24 | 03ff3ca3 | aliguori | #ifndef _WIN32
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25 | 7a5ca864 | bellard | #include <sys/ioctl.h> |
26 | 03ff3ca3 | aliguori | #endif
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27 | 5dc2eec9 | Andreas Färber | #if defined(__sun__) || defined(__HAIKU__)
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28 | 7e00eb9b | aliguori | #include <sys/ioccom.h> |
29 | 7e00eb9b | aliguori | #endif
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30 | 7a5ca864 | bellard | #include <ctype.h> |
31 | 7a5ca864 | bellard | #include <inttypes.h> |
32 | 75818250 | ths | |
33 | b90fb4b8 | Paolo Bonzini | #ifdef __linux__
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34 | b90fb4b8 | Paolo Bonzini | #include <linux/fs.h> |
35 | b90fb4b8 | Paolo Bonzini | #endif
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36 | b90fb4b8 | Paolo Bonzini | |
37 | 03ff3ca3 | aliguori | #include "qemu_socket.h" |
38 | 03ff3ca3 | aliguori | |
39 | 03ff3ca3 | aliguori | //#define DEBUG_NBD
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40 | 03ff3ca3 | aliguori | |
41 | 03ff3ca3 | aliguori | #ifdef DEBUG_NBD
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42 | 75818250 | ths | #define TRACE(msg, ...) do { \ |
43 | 03ff3ca3 | aliguori | LOG(msg, ## __VA_ARGS__); \ |
44 | 75818250 | ths | } while(0) |
45 | 03ff3ca3 | aliguori | #else
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46 | 03ff3ca3 | aliguori | #define TRACE(msg, ...) \
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47 | 03ff3ca3 | aliguori | do { } while (0) |
48 | 03ff3ca3 | aliguori | #endif
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49 | 7a5ca864 | bellard | |
50 | 7a5ca864 | bellard | #define LOG(msg, ...) do { \ |
51 | 7a5ca864 | bellard | fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
52 | 7a5ca864 | bellard | __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
53 | 7a5ca864 | bellard | } while(0) |
54 | 7a5ca864 | bellard | |
55 | 7a5ca864 | bellard | /* This is all part of the "official" NBD API */
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56 | 7a5ca864 | bellard | |
57 | b2e3d87f | Nick Thomas | #define NBD_REPLY_SIZE (4 + 4 + 8) |
58 | 7a5ca864 | bellard | #define NBD_REQUEST_MAGIC 0x25609513 |
59 | 7a5ca864 | bellard | #define NBD_REPLY_MAGIC 0x67446698 |
60 | 7a5ca864 | bellard | |
61 | 7a5ca864 | bellard | #define NBD_SET_SOCK _IO(0xab, 0) |
62 | 7a5ca864 | bellard | #define NBD_SET_BLKSIZE _IO(0xab, 1) |
63 | 7a5ca864 | bellard | #define NBD_SET_SIZE _IO(0xab, 2) |
64 | 7a5ca864 | bellard | #define NBD_DO_IT _IO(0xab, 3) |
65 | 7a5ca864 | bellard | #define NBD_CLEAR_SOCK _IO(0xab, 4) |
66 | 7a5ca864 | bellard | #define NBD_CLEAR_QUE _IO(0xab, 5) |
67 | b2e3d87f | Nick Thomas | #define NBD_PRINT_DEBUG _IO(0xab, 6) |
68 | b2e3d87f | Nick Thomas | #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
69 | 7a5ca864 | bellard | #define NBD_DISCONNECT _IO(0xab, 8) |
70 | bbb74edd | Paolo Bonzini | #define NBD_SET_TIMEOUT _IO(0xab, 9) |
71 | bbb74edd | Paolo Bonzini | #define NBD_SET_FLAGS _IO(0xab, 10) |
72 | 7a5ca864 | bellard | |
73 | b2e3d87f | Nick Thomas | #define NBD_OPT_EXPORT_NAME (1 << 0) |
74 | 1d45f8b5 | Laurent Vivier | |
75 | 7a5ca864 | bellard | /* That's all folks */
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76 | 7a5ca864 | bellard | |
77 | 75818250 | ths | #define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true) |
78 | 75818250 | ths | #define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false) |
79 | 7a5ca864 | bellard | |
80 | 75818250 | ths | size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
81 | 7a5ca864 | bellard | { |
82 | 7a5ca864 | bellard | size_t offset = 0;
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83 | 7a5ca864 | bellard | |
84 | 7a5ca864 | bellard | while (offset < size) {
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85 | 7a5ca864 | bellard | ssize_t len; |
86 | 7a5ca864 | bellard | |
87 | 7a5ca864 | bellard | if (do_read) {
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88 | 00aa0040 | Blue Swirl | len = qemu_recv(fd, buffer + offset, size - offset, 0);
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89 | 7a5ca864 | bellard | } else {
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90 | 03ff3ca3 | aliguori | len = send(fd, buffer + offset, size - offset, 0);
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91 | 7a5ca864 | bellard | } |
92 | 7a5ca864 | bellard | |
93 | 03ff3ca3 | aliguori | if (len == -1) |
94 | 03ff3ca3 | aliguori | errno = socket_error(); |
95 | 03ff3ca3 | aliguori | |
96 | 7a5ca864 | bellard | /* recoverable error */
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97 | 75818250 | ths | if (len == -1 && (errno == EAGAIN || errno == EINTR)) { |
98 | 7a5ca864 | bellard | continue;
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99 | 7a5ca864 | bellard | } |
100 | 7a5ca864 | bellard | |
101 | 7a5ca864 | bellard | /* eof */
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102 | 7a5ca864 | bellard | if (len == 0) { |
103 | 7a5ca864 | bellard | break;
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104 | 7a5ca864 | bellard | } |
105 | 7a5ca864 | bellard | |
106 | 7a5ca864 | bellard | /* unrecoverable error */
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107 | 7a5ca864 | bellard | if (len == -1) { |
108 | 7a5ca864 | bellard | return 0; |
109 | 7a5ca864 | bellard | } |
110 | 7a5ca864 | bellard | |
111 | 7a5ca864 | bellard | offset += len; |
112 | 7a5ca864 | bellard | } |
113 | 7a5ca864 | bellard | |
114 | 7a5ca864 | bellard | return offset;
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115 | 7a5ca864 | bellard | } |
116 | 7a5ca864 | bellard | |
117 | c12504ce | Nick Thomas | static void combine_addr(char *buf, size_t len, const char* address, |
118 | c12504ce | Nick Thomas | uint16_t port) |
119 | 7a5ca864 | bellard | { |
120 | c12504ce | Nick Thomas | /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
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121 | c12504ce | Nick Thomas | if (strstr(address, ":")) { |
122 | c12504ce | Nick Thomas | snprintf(buf, len, "[%s]:%u", address, port);
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123 | c12504ce | Nick Thomas | } else {
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124 | c12504ce | Nick Thomas | snprintf(buf, len, "%s:%u", address, port);
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125 | 7a5ca864 | bellard | } |
126 | 7a5ca864 | bellard | } |
127 | 7a5ca864 | bellard | |
128 | c12504ce | Nick Thomas | int tcp_socket_outgoing(const char *address, uint16_t port) |
129 | 7a5ca864 | bellard | { |
130 | c12504ce | Nick Thomas | char address_and_port[128]; |
131 | c12504ce | Nick Thomas | combine_addr(address_and_port, 128, address, port);
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132 | c12504ce | Nick Thomas | return tcp_socket_outgoing_spec(address_and_port);
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133 | 7a5ca864 | bellard | } |
134 | 7a5ca864 | bellard | |
135 | c12504ce | Nick Thomas | int tcp_socket_outgoing_spec(const char *address_and_port) |
136 | cd831bd7 | ths | { |
137 | c12504ce | Nick Thomas | return inet_connect(address_and_port, SOCK_STREAM);
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138 | cd831bd7 | ths | } |
139 | cd831bd7 | ths | |
140 | c12504ce | Nick Thomas | int tcp_socket_incoming(const char *address, uint16_t port) |
141 | cd831bd7 | ths | { |
142 | c12504ce | Nick Thomas | char address_and_port[128]; |
143 | c12504ce | Nick Thomas | combine_addr(address_and_port, 128, address, port);
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144 | c12504ce | Nick Thomas | return tcp_socket_incoming_spec(address_and_port);
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145 | c12504ce | Nick Thomas | } |
146 | cd831bd7 | ths | |
147 | c12504ce | Nick Thomas | int tcp_socket_incoming_spec(const char *address_and_port) |
148 | c12504ce | Nick Thomas | { |
149 | c12504ce | Nick Thomas | char *ostr = NULL; |
150 | c12504ce | Nick Thomas | int olen = 0; |
151 | c12504ce | Nick Thomas | return inet_listen(address_and_port, ostr, olen, SOCK_STREAM, 0); |
152 | 03ff3ca3 | aliguori | } |
153 | c12504ce | Nick Thomas | |
154 | 03ff3ca3 | aliguori | int unix_socket_incoming(const char *path) |
155 | 03ff3ca3 | aliguori | { |
156 | c12504ce | Nick Thomas | char *ostr = NULL; |
157 | c12504ce | Nick Thomas | int olen = 0; |
158 | c12504ce | Nick Thomas | |
159 | c12504ce | Nick Thomas | return unix_listen(path, ostr, olen);
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160 | cd831bd7 | ths | } |
161 | cd831bd7 | ths | |
162 | 03ff3ca3 | aliguori | int unix_socket_outgoing(const char *path) |
163 | 03ff3ca3 | aliguori | { |
164 | c12504ce | Nick Thomas | return unix_connect(path);
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165 | 03ff3ca3 | aliguori | } |
166 | cd831bd7 | ths | |
167 | 7a5ca864 | bellard | /* Basic flow
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168 | 7a5ca864 | bellard | |
169 | 7a5ca864 | bellard | Server Client
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170 | 7a5ca864 | bellard | |
171 | 7a5ca864 | bellard | Negotiate
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172 | 7a5ca864 | bellard | Request
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173 | 7a5ca864 | bellard | Response
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174 | 7a5ca864 | bellard | Request
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175 | 7a5ca864 | bellard | Response
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176 | 7a5ca864 | bellard | ...
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177 | 7a5ca864 | bellard | ...
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178 | 7a5ca864 | bellard | Request (type == 2)
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179 | 7a5ca864 | bellard | */
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180 | 7a5ca864 | bellard | |
181 | b90fb4b8 | Paolo Bonzini | int nbd_negotiate(int csock, off_t size, uint32_t flags) |
182 | 7a5ca864 | bellard | { |
183 | b2e3d87f | Nick Thomas | char buf[8 + 8 + 8 + 128]; |
184 | b2e3d87f | Nick Thomas | |
185 | b2e3d87f | Nick Thomas | /* Negotiate
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186 | b2e3d87f | Nick Thomas | [ 0 .. 7] passwd ("NBDMAGIC")
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187 | b2e3d87f | Nick Thomas | [ 8 .. 15] magic (0x00420281861253)
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188 | b2e3d87f | Nick Thomas | [16 .. 23] size
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189 | b90fb4b8 | Paolo Bonzini | [24 .. 27] flags
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190 | b90fb4b8 | Paolo Bonzini | [28 .. 151] reserved (0)
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191 | b2e3d87f | Nick Thomas | */
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192 | b2e3d87f | Nick Thomas | |
193 | b2e3d87f | Nick Thomas | TRACE("Beginning negotiation.");
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194 | b2e3d87f | Nick Thomas | memcpy(buf, "NBDMAGIC", 8); |
195 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
196 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 16), size);
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197 | b90fb4b8 | Paolo Bonzini | cpu_to_be32w((uint32_t*)(buf + 24), flags | NBD_FLAG_HAS_FLAGS);
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198 | b90fb4b8 | Paolo Bonzini | memset(buf + 28, 0, 124); |
199 | b2e3d87f | Nick Thomas | |
200 | b2e3d87f | Nick Thomas | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
201 | b2e3d87f | Nick Thomas | LOG("write failed");
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202 | b2e3d87f | Nick Thomas | errno = EINVAL; |
203 | b2e3d87f | Nick Thomas | return -1; |
204 | b2e3d87f | Nick Thomas | } |
205 | b2e3d87f | Nick Thomas | |
206 | 07f35073 | Dong Xu Wang | TRACE("Negotiation succeeded.");
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207 | b2e3d87f | Nick Thomas | |
208 | b2e3d87f | Nick Thomas | return 0; |
209 | 7a5ca864 | bellard | } |
210 | 7a5ca864 | bellard | |
211 | 1d45f8b5 | Laurent Vivier | int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags, |
212 | 1d45f8b5 | Laurent Vivier | off_t *size, size_t *blocksize) |
213 | 7a5ca864 | bellard | { |
214 | b2e3d87f | Nick Thomas | char buf[256]; |
215 | b2e3d87f | Nick Thomas | uint64_t magic, s; |
216 | b2e3d87f | Nick Thomas | uint16_t tmp; |
217 | b2e3d87f | Nick Thomas | |
218 | 07f35073 | Dong Xu Wang | TRACE("Receiving negotiation.");
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219 | b2e3d87f | Nick Thomas | |
220 | b2e3d87f | Nick Thomas | if (read_sync(csock, buf, 8) != 8) { |
221 | b2e3d87f | Nick Thomas | LOG("read failed");
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222 | b2e3d87f | Nick Thomas | errno = EINVAL; |
223 | b2e3d87f | Nick Thomas | return -1; |
224 | b2e3d87f | Nick Thomas | } |
225 | b2e3d87f | Nick Thomas | |
226 | b2e3d87f | Nick Thomas | buf[8] = '\0'; |
227 | b2e3d87f | Nick Thomas | if (strlen(buf) == 0) { |
228 | b2e3d87f | Nick Thomas | LOG("server connection closed");
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229 | b2e3d87f | Nick Thomas | errno = EINVAL; |
230 | b2e3d87f | Nick Thomas | return -1; |
231 | b2e3d87f | Nick Thomas | } |
232 | b2e3d87f | Nick Thomas | |
233 | b2e3d87f | Nick Thomas | TRACE("Magic is %c%c%c%c%c%c%c%c",
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234 | b2e3d87f | Nick Thomas | qemu_isprint(buf[0]) ? buf[0] : '.', |
235 | b2e3d87f | Nick Thomas | qemu_isprint(buf[1]) ? buf[1] : '.', |
236 | b2e3d87f | Nick Thomas | qemu_isprint(buf[2]) ? buf[2] : '.', |
237 | b2e3d87f | Nick Thomas | qemu_isprint(buf[3]) ? buf[3] : '.', |
238 | b2e3d87f | Nick Thomas | qemu_isprint(buf[4]) ? buf[4] : '.', |
239 | b2e3d87f | Nick Thomas | qemu_isprint(buf[5]) ? buf[5] : '.', |
240 | b2e3d87f | Nick Thomas | qemu_isprint(buf[6]) ? buf[6] : '.', |
241 | b2e3d87f | Nick Thomas | qemu_isprint(buf[7]) ? buf[7] : '.'); |
242 | b2e3d87f | Nick Thomas | |
243 | b2e3d87f | Nick Thomas | if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
244 | b2e3d87f | Nick Thomas | LOG("Invalid magic received");
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245 | b2e3d87f | Nick Thomas | errno = EINVAL; |
246 | b2e3d87f | Nick Thomas | return -1; |
247 | b2e3d87f | Nick Thomas | } |
248 | b2e3d87f | Nick Thomas | |
249 | b2e3d87f | Nick Thomas | if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
250 | b2e3d87f | Nick Thomas | LOG("read failed");
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251 | b2e3d87f | Nick Thomas | errno = EINVAL; |
252 | b2e3d87f | Nick Thomas | return -1; |
253 | b2e3d87f | Nick Thomas | } |
254 | b2e3d87f | Nick Thomas | magic = be64_to_cpu(magic); |
255 | b2e3d87f | Nick Thomas | TRACE("Magic is 0x%" PRIx64, magic);
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256 | b2e3d87f | Nick Thomas | |
257 | b2e3d87f | Nick Thomas | if (name) {
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258 | b2e3d87f | Nick Thomas | uint32_t reserved = 0;
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259 | b2e3d87f | Nick Thomas | uint32_t opt; |
260 | b2e3d87f | Nick Thomas | uint32_t namesize; |
261 | b2e3d87f | Nick Thomas | |
262 | b2e3d87f | Nick Thomas | TRACE("Checking magic (opts_magic)");
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263 | b2e3d87f | Nick Thomas | if (magic != 0x49484156454F5054LL) { |
264 | b2e3d87f | Nick Thomas | LOG("Bad magic received");
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265 | b2e3d87f | Nick Thomas | errno = EINVAL; |
266 | b2e3d87f | Nick Thomas | return -1; |
267 | b2e3d87f | Nick Thomas | } |
268 | b2e3d87f | Nick Thomas | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
269 | b2e3d87f | Nick Thomas | LOG("flags read failed");
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270 | b2e3d87f | Nick Thomas | errno = EINVAL; |
271 | b2e3d87f | Nick Thomas | return -1; |
272 | b2e3d87f | Nick Thomas | } |
273 | b2e3d87f | Nick Thomas | *flags = be16_to_cpu(tmp) << 16;
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274 | b2e3d87f | Nick Thomas | /* reserved for future use */
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275 | b2e3d87f | Nick Thomas | if (write_sync(csock, &reserved, sizeof(reserved)) != |
276 | b2e3d87f | Nick Thomas | sizeof(reserved)) {
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277 | b2e3d87f | Nick Thomas | LOG("write failed (reserved)");
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278 | b2e3d87f | Nick Thomas | errno = EINVAL; |
279 | b2e3d87f | Nick Thomas | return -1; |
280 | b2e3d87f | Nick Thomas | } |
281 | b2e3d87f | Nick Thomas | /* write the export name */
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282 | b2e3d87f | Nick Thomas | magic = cpu_to_be64(magic); |
283 | b2e3d87f | Nick Thomas | if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) { |
284 | b2e3d87f | Nick Thomas | LOG("write failed (magic)");
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285 | b2e3d87f | Nick Thomas | errno = EINVAL; |
286 | b2e3d87f | Nick Thomas | return -1; |
287 | b2e3d87f | Nick Thomas | } |
288 | b2e3d87f | Nick Thomas | opt = cpu_to_be32(NBD_OPT_EXPORT_NAME); |
289 | b2e3d87f | Nick Thomas | if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) { |
290 | b2e3d87f | Nick Thomas | LOG("write failed (opt)");
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291 | b2e3d87f | Nick Thomas | errno = EINVAL; |
292 | b2e3d87f | Nick Thomas | return -1; |
293 | b2e3d87f | Nick Thomas | } |
294 | b2e3d87f | Nick Thomas | namesize = cpu_to_be32(strlen(name)); |
295 | b2e3d87f | Nick Thomas | if (write_sync(csock, &namesize, sizeof(namesize)) != |
296 | b2e3d87f | Nick Thomas | sizeof(namesize)) {
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297 | b2e3d87f | Nick Thomas | LOG("write failed (namesize)");
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298 | b2e3d87f | Nick Thomas | errno = EINVAL; |
299 | b2e3d87f | Nick Thomas | return -1; |
300 | b2e3d87f | Nick Thomas | } |
301 | b2e3d87f | Nick Thomas | if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) { |
302 | b2e3d87f | Nick Thomas | LOG("write failed (name)");
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303 | b2e3d87f | Nick Thomas | errno = EINVAL; |
304 | b2e3d87f | Nick Thomas | return -1; |
305 | b2e3d87f | Nick Thomas | } |
306 | b2e3d87f | Nick Thomas | } else {
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307 | b2e3d87f | Nick Thomas | TRACE("Checking magic (cli_magic)");
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308 | b2e3d87f | Nick Thomas | |
309 | b2e3d87f | Nick Thomas | if (magic != 0x00420281861253LL) { |
310 | b2e3d87f | Nick Thomas | LOG("Bad magic received");
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311 | b2e3d87f | Nick Thomas | errno = EINVAL; |
312 | b2e3d87f | Nick Thomas | return -1; |
313 | b2e3d87f | Nick Thomas | } |
314 | b2e3d87f | Nick Thomas | } |
315 | b2e3d87f | Nick Thomas | |
316 | b2e3d87f | Nick Thomas | if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) { |
317 | b2e3d87f | Nick Thomas | LOG("read failed");
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318 | b2e3d87f | Nick Thomas | errno = EINVAL; |
319 | b2e3d87f | Nick Thomas | return -1; |
320 | b2e3d87f | Nick Thomas | } |
321 | b2e3d87f | Nick Thomas | *size = be64_to_cpu(s); |
322 | b2e3d87f | Nick Thomas | *blocksize = 1024;
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323 | b2e3d87f | Nick Thomas | TRACE("Size is %" PRIu64, *size);
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324 | b2e3d87f | Nick Thomas | |
325 | b2e3d87f | Nick Thomas | if (!name) {
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326 | b2e3d87f | Nick Thomas | if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) { |
327 | b2e3d87f | Nick Thomas | LOG("read failed (flags)");
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328 | b2e3d87f | Nick Thomas | errno = EINVAL; |
329 | b2e3d87f | Nick Thomas | return -1; |
330 | b2e3d87f | Nick Thomas | } |
331 | b2e3d87f | Nick Thomas | *flags = be32_to_cpup(flags); |
332 | b2e3d87f | Nick Thomas | } else {
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333 | b2e3d87f | Nick Thomas | if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) { |
334 | b2e3d87f | Nick Thomas | LOG("read failed (tmp)");
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335 | b2e3d87f | Nick Thomas | errno = EINVAL; |
336 | b2e3d87f | Nick Thomas | return -1; |
337 | b2e3d87f | Nick Thomas | } |
338 | b2e3d87f | Nick Thomas | *flags |= be32_to_cpu(tmp); |
339 | b2e3d87f | Nick Thomas | } |
340 | b2e3d87f | Nick Thomas | if (read_sync(csock, &buf, 124) != 124) { |
341 | b2e3d87f | Nick Thomas | LOG("read failed (buf)");
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342 | b2e3d87f | Nick Thomas | errno = EINVAL; |
343 | b2e3d87f | Nick Thomas | return -1; |
344 | b2e3d87f | Nick Thomas | } |
345 | cd831bd7 | ths | return 0; |
346 | cd831bd7 | ths | } |
347 | 7a5ca864 | bellard | |
348 | b90fb4b8 | Paolo Bonzini | #ifdef __linux__
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349 | b90fb4b8 | Paolo Bonzini | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
350 | cd831bd7 | ths | { |
351 | b2e3d87f | Nick Thomas | TRACE("Setting block size to %lu", (unsigned long)blocksize); |
352 | 7a5ca864 | bellard | |
353 | b2e3d87f | Nick Thomas | if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
354 | b2e3d87f | Nick Thomas | int serrno = errno;
|
355 | b2e3d87f | Nick Thomas | LOG("Failed setting NBD block size");
|
356 | b2e3d87f | Nick Thomas | errno = serrno; |
357 | b2e3d87f | Nick Thomas | return -1; |
358 | b2e3d87f | Nick Thomas | } |
359 | 7a5ca864 | bellard | |
360 | 0bfcd599 | Blue Swirl | TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize));
|
361 | 7a5ca864 | bellard | |
362 | b2e3d87f | Nick Thomas | if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
363 | b2e3d87f | Nick Thomas | int serrno = errno;
|
364 | b2e3d87f | Nick Thomas | LOG("Failed setting size (in blocks)");
|
365 | b2e3d87f | Nick Thomas | errno = serrno; |
366 | b2e3d87f | Nick Thomas | return -1; |
367 | b2e3d87f | Nick Thomas | } |
368 | 7a5ca864 | bellard | |
369 | b90fb4b8 | Paolo Bonzini | if (flags & NBD_FLAG_READ_ONLY) {
|
370 | b90fb4b8 | Paolo Bonzini | int read_only = 1; |
371 | b90fb4b8 | Paolo Bonzini | TRACE("Setting readonly attribute");
|
372 | b90fb4b8 | Paolo Bonzini | |
373 | b90fb4b8 | Paolo Bonzini | if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) { |
374 | b90fb4b8 | Paolo Bonzini | int serrno = errno;
|
375 | b90fb4b8 | Paolo Bonzini | LOG("Failed setting read-only attribute");
|
376 | b90fb4b8 | Paolo Bonzini | errno = serrno; |
377 | b90fb4b8 | Paolo Bonzini | return -1; |
378 | b90fb4b8 | Paolo Bonzini | } |
379 | b90fb4b8 | Paolo Bonzini | } |
380 | b90fb4b8 | Paolo Bonzini | |
381 | 973b3d0a | Paolo Bonzini | if (ioctl(fd, NBD_SET_FLAGS, flags) < 0 |
382 | 973b3d0a | Paolo Bonzini | && errno != ENOTTY) { |
383 | 973b3d0a | Paolo Bonzini | int serrno = errno;
|
384 | 973b3d0a | Paolo Bonzini | LOG("Failed setting flags");
|
385 | 973b3d0a | Paolo Bonzini | errno = serrno; |
386 | 973b3d0a | Paolo Bonzini | return -1; |
387 | 973b3d0a | Paolo Bonzini | } |
388 | 973b3d0a | Paolo Bonzini | |
389 | b2e3d87f | Nick Thomas | TRACE("Clearing NBD socket");
|
390 | 7a5ca864 | bellard | |
391 | b2e3d87f | Nick Thomas | if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
392 | b2e3d87f | Nick Thomas | int serrno = errno;
|
393 | b2e3d87f | Nick Thomas | LOG("Failed clearing NBD socket");
|
394 | b2e3d87f | Nick Thomas | errno = serrno; |
395 | b2e3d87f | Nick Thomas | return -1; |
396 | b2e3d87f | Nick Thomas | } |
397 | 7a5ca864 | bellard | |
398 | b2e3d87f | Nick Thomas | TRACE("Setting NBD socket");
|
399 | 7a5ca864 | bellard | |
400 | b2e3d87f | Nick Thomas | if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
401 | b2e3d87f | Nick Thomas | int serrno = errno;
|
402 | b2e3d87f | Nick Thomas | LOG("Failed to set NBD socket");
|
403 | b2e3d87f | Nick Thomas | errno = serrno; |
404 | b2e3d87f | Nick Thomas | return -1; |
405 | b2e3d87f | Nick Thomas | } |
406 | 7a5ca864 | bellard | |
407 | b2e3d87f | Nick Thomas | TRACE("Negotiation ended");
|
408 | 7a5ca864 | bellard | |
409 | b2e3d87f | Nick Thomas | return 0; |
410 | 7a5ca864 | bellard | } |
411 | 7a5ca864 | bellard | |
412 | 7a5ca864 | bellard | int nbd_disconnect(int fd) |
413 | 7a5ca864 | bellard | { |
414 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_QUE); |
415 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_DISCONNECT); |
416 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_SOCK); |
417 | b2e3d87f | Nick Thomas | return 0; |
418 | 7a5ca864 | bellard | } |
419 | 7a5ca864 | bellard | |
420 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
421 | 7a5ca864 | bellard | { |
422 | b2e3d87f | Nick Thomas | int ret;
|
423 | b2e3d87f | Nick Thomas | int serrno;
|
424 | 7a5ca864 | bellard | |
425 | b2e3d87f | Nick Thomas | TRACE("Doing NBD loop");
|
426 | 7a5ca864 | bellard | |
427 | b2e3d87f | Nick Thomas | ret = ioctl(fd, NBD_DO_IT); |
428 | 74624688 | Paolo Bonzini | if (ret == -1 && errno == EPIPE) { |
429 | 74624688 | Paolo Bonzini | /* NBD_DO_IT normally returns EPIPE when someone has disconnected
|
430 | 74624688 | Paolo Bonzini | * the socket via NBD_DISCONNECT. We do not want to return 1 in
|
431 | 74624688 | Paolo Bonzini | * that case.
|
432 | 74624688 | Paolo Bonzini | */
|
433 | 74624688 | Paolo Bonzini | ret = 0;
|
434 | 74624688 | Paolo Bonzini | } |
435 | b2e3d87f | Nick Thomas | serrno = errno; |
436 | 7a5ca864 | bellard | |
437 | b2e3d87f | Nick Thomas | TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
438 | 7a5ca864 | bellard | |
439 | b2e3d87f | Nick Thomas | TRACE("Clearing NBD queue");
|
440 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_QUE); |
441 | 7a5ca864 | bellard | |
442 | b2e3d87f | Nick Thomas | TRACE("Clearing NBD socket");
|
443 | b2e3d87f | Nick Thomas | ioctl(fd, NBD_CLEAR_SOCK); |
444 | 7a5ca864 | bellard | |
445 | b2e3d87f | Nick Thomas | errno = serrno; |
446 | b2e3d87f | Nick Thomas | return ret;
|
447 | 7a5ca864 | bellard | } |
448 | 03ff3ca3 | aliguori | #else
|
449 | 8e72506e | Paolo Bonzini | int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize) |
450 | 03ff3ca3 | aliguori | { |
451 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
452 | 03ff3ca3 | aliguori | return -1; |
453 | 03ff3ca3 | aliguori | } |
454 | 03ff3ca3 | aliguori | |
455 | 03ff3ca3 | aliguori | int nbd_disconnect(int fd) |
456 | 03ff3ca3 | aliguori | { |
457 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
458 | 03ff3ca3 | aliguori | return -1; |
459 | 03ff3ca3 | aliguori | } |
460 | 03ff3ca3 | aliguori | |
461 | 0a4eb864 | Jes Sorensen | int nbd_client(int fd) |
462 | 03ff3ca3 | aliguori | { |
463 | 03ff3ca3 | aliguori | errno = ENOTSUP; |
464 | 03ff3ca3 | aliguori | return -1; |
465 | 03ff3ca3 | aliguori | } |
466 | 03ff3ca3 | aliguori | #endif
|
467 | 7a5ca864 | bellard | |
468 | 75818250 | ths | int nbd_send_request(int csock, struct nbd_request *request) |
469 | 7a5ca864 | bellard | { |
470 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
471 | b2e3d87f | Nick Thomas | |
472 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
473 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
474 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
475 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
476 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
477 | 75818250 | ths | |
478 | b2e3d87f | Nick Thomas | TRACE("Sending request to client: "
|
479 | b2e3d87f | Nick Thomas | "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}", |
480 | b2e3d87f | Nick Thomas | request->from, request->len, request->handle, request->type); |
481 | b2e3d87f | Nick Thomas | |
482 | b2e3d87f | Nick Thomas | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
483 | b2e3d87f | Nick Thomas | LOG("writing to socket failed");
|
484 | b2e3d87f | Nick Thomas | errno = EINVAL; |
485 | b2e3d87f | Nick Thomas | return -1; |
486 | b2e3d87f | Nick Thomas | } |
487 | b2e3d87f | Nick Thomas | return 0; |
488 | b2e3d87f | Nick Thomas | } |
489 | 75818250 | ths | |
490 | 75818250 | ths | static int nbd_receive_request(int csock, struct nbd_request *request) |
491 | 75818250 | ths | { |
492 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8 + 8 + 4]; |
493 | b2e3d87f | Nick Thomas | uint32_t magic; |
494 | b2e3d87f | Nick Thomas | |
495 | b2e3d87f | Nick Thomas | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
496 | b2e3d87f | Nick Thomas | LOG("read failed");
|
497 | b2e3d87f | Nick Thomas | errno = EINVAL; |
498 | b2e3d87f | Nick Thomas | return -1; |
499 | b2e3d87f | Nick Thomas | } |
500 | b2e3d87f | Nick Thomas | |
501 | b2e3d87f | Nick Thomas | /* Request
|
502 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
503 | b2e3d87f | Nick Thomas | [ 4 .. 7] type (0 == READ, 1 == WRITE)
|
504 | b2e3d87f | Nick Thomas | [ 8 .. 15] handle
|
505 | b2e3d87f | Nick Thomas | [16 .. 23] from
|
506 | b2e3d87f | Nick Thomas | [24 .. 27] len
|
507 | b2e3d87f | Nick Thomas | */
|
508 | b2e3d87f | Nick Thomas | |
509 | b2e3d87f | Nick Thomas | magic = be32_to_cpup((uint32_t*)buf); |
510 | b2e3d87f | Nick Thomas | request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
511 | b2e3d87f | Nick Thomas | request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
512 | b2e3d87f | Nick Thomas | request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
513 | b2e3d87f | Nick Thomas | request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
514 | b2e3d87f | Nick Thomas | |
515 | b2e3d87f | Nick Thomas | TRACE("Got request: "
|
516 | b2e3d87f | Nick Thomas | "{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
517 | b2e3d87f | Nick Thomas | magic, request->type, request->from, request->len); |
518 | b2e3d87f | Nick Thomas | |
519 | b2e3d87f | Nick Thomas | if (magic != NBD_REQUEST_MAGIC) {
|
520 | b2e3d87f | Nick Thomas | LOG("invalid magic (got 0x%x)", magic);
|
521 | b2e3d87f | Nick Thomas | errno = EINVAL; |
522 | b2e3d87f | Nick Thomas | return -1; |
523 | b2e3d87f | Nick Thomas | } |
524 | b2e3d87f | Nick Thomas | return 0; |
525 | 75818250 | ths | } |
526 | 75818250 | ths | |
527 | 75818250 | ths | int nbd_receive_reply(int csock, struct nbd_reply *reply) |
528 | 75818250 | ths | { |
529 | b2e3d87f | Nick Thomas | uint8_t buf[NBD_REPLY_SIZE]; |
530 | b2e3d87f | Nick Thomas | uint32_t magic; |
531 | b2e3d87f | Nick Thomas | |
532 | b2e3d87f | Nick Thomas | memset(buf, 0xAA, sizeof(buf)); |
533 | b2e3d87f | Nick Thomas | |
534 | b2e3d87f | Nick Thomas | if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
535 | b2e3d87f | Nick Thomas | LOG("read failed");
|
536 | b2e3d87f | Nick Thomas | errno = EINVAL; |
537 | b2e3d87f | Nick Thomas | return -1; |
538 | b2e3d87f | Nick Thomas | } |
539 | b2e3d87f | Nick Thomas | |
540 | b2e3d87f | Nick Thomas | /* Reply
|
541 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
542 | b2e3d87f | Nick Thomas | [ 4 .. 7] error (0 == no error)
|
543 | b2e3d87f | Nick Thomas | [ 7 .. 15] handle
|
544 | b2e3d87f | Nick Thomas | */
|
545 | b2e3d87f | Nick Thomas | |
546 | b2e3d87f | Nick Thomas | magic = be32_to_cpup((uint32_t*)buf); |
547 | b2e3d87f | Nick Thomas | reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
548 | b2e3d87f | Nick Thomas | reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
549 | b2e3d87f | Nick Thomas | |
550 | b2e3d87f | Nick Thomas | TRACE("Got reply: "
|
551 | b2e3d87f | Nick Thomas | "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
552 | b2e3d87f | Nick Thomas | magic, reply->error, reply->handle); |
553 | b2e3d87f | Nick Thomas | |
554 | b2e3d87f | Nick Thomas | if (magic != NBD_REPLY_MAGIC) {
|
555 | b2e3d87f | Nick Thomas | LOG("invalid magic (got 0x%x)", magic);
|
556 | b2e3d87f | Nick Thomas | errno = EINVAL; |
557 | b2e3d87f | Nick Thomas | return -1; |
558 | b2e3d87f | Nick Thomas | } |
559 | b2e3d87f | Nick Thomas | return 0; |
560 | 75818250 | ths | } |
561 | 75818250 | ths | |
562 | 75818250 | ths | static int nbd_send_reply(int csock, struct nbd_reply *reply) |
563 | 75818250 | ths | { |
564 | b2e3d87f | Nick Thomas | uint8_t buf[4 + 4 + 8]; |
565 | b2e3d87f | Nick Thomas | |
566 | b2e3d87f | Nick Thomas | /* Reply
|
567 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
568 | b2e3d87f | Nick Thomas | [ 4 .. 7] error (0 == no error)
|
569 | b2e3d87f | Nick Thomas | [ 7 .. 15] handle
|
570 | b2e3d87f | Nick Thomas | */
|
571 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
572 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
573 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
574 | b2e3d87f | Nick Thomas | |
575 | b2e3d87f | Nick Thomas | TRACE("Sending response to client");
|
576 | b2e3d87f | Nick Thomas | |
577 | b2e3d87f | Nick Thomas | if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
578 | b2e3d87f | Nick Thomas | LOG("writing to socket failed");
|
579 | b2e3d87f | Nick Thomas | errno = EINVAL; |
580 | b2e3d87f | Nick Thomas | return -1; |
581 | b2e3d87f | Nick Thomas | } |
582 | b2e3d87f | Nick Thomas | return 0; |
583 | 75818250 | ths | } |
584 | 7a5ca864 | bellard | |
585 | 75818250 | ths | int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
586 | b90fb4b8 | Paolo Bonzini | off_t *offset, uint32_t nbdflags, uint8_t *data, int data_size)
|
587 | 75818250 | ths | { |
588 | b2e3d87f | Nick Thomas | struct nbd_request request;
|
589 | b2e3d87f | Nick Thomas | struct nbd_reply reply;
|
590 | b2e3d87f | Nick Thomas | |
591 | b2e3d87f | Nick Thomas | TRACE("Reading request.");
|
592 | b2e3d87f | Nick Thomas | |
593 | b2e3d87f | Nick Thomas | if (nbd_receive_request(csock, &request) == -1) |
594 | b2e3d87f | Nick Thomas | return -1; |
595 | b2e3d87f | Nick Thomas | |
596 | b2e3d87f | Nick Thomas | if (request.len + NBD_REPLY_SIZE > data_size) {
|
597 | b2e3d87f | Nick Thomas | LOG("len (%u) is larger than max len (%u)",
|
598 | b2e3d87f | Nick Thomas | request.len + NBD_REPLY_SIZE, data_size); |
599 | b2e3d87f | Nick Thomas | errno = EINVAL; |
600 | b2e3d87f | Nick Thomas | return -1; |
601 | b2e3d87f | Nick Thomas | } |
602 | b2e3d87f | Nick Thomas | |
603 | b2e3d87f | Nick Thomas | if ((request.from + request.len) < request.from) {
|
604 | b2e3d87f | Nick Thomas | LOG("integer overflow detected! "
|
605 | b2e3d87f | Nick Thomas | "you're probably being attacked");
|
606 | b2e3d87f | Nick Thomas | errno = EINVAL; |
607 | b2e3d87f | Nick Thomas | return -1; |
608 | b2e3d87f | Nick Thomas | } |
609 | b2e3d87f | Nick Thomas | |
610 | b2e3d87f | Nick Thomas | if ((request.from + request.len) > size) {
|
611 | b2e3d87f | Nick Thomas | LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
612 | b2e3d87f | Nick Thomas | ", Offset: %" PRIu64 "\n", |
613 | b9e82a59 | blueswir1 | request.from, request.len, (uint64_t)size, dev_offset); |
614 | b2e3d87f | Nick Thomas | LOG("requested operation past EOF--bad client?");
|
615 | b2e3d87f | Nick Thomas | errno = EINVAL; |
616 | b2e3d87f | Nick Thomas | return -1; |
617 | b2e3d87f | Nick Thomas | } |
618 | b2e3d87f | Nick Thomas | |
619 | b2e3d87f | Nick Thomas | TRACE("Decoding type");
|
620 | b2e3d87f | Nick Thomas | |
621 | b2e3d87f | Nick Thomas | reply.handle = request.handle; |
622 | b2e3d87f | Nick Thomas | reply.error = 0;
|
623 | b2e3d87f | Nick Thomas | |
624 | b2e3d87f | Nick Thomas | switch (request.type) {
|
625 | b2e3d87f | Nick Thomas | case NBD_CMD_READ:
|
626 | b2e3d87f | Nick Thomas | TRACE("Request type is READ");
|
627 | b2e3d87f | Nick Thomas | |
628 | b2e3d87f | Nick Thomas | if (bdrv_read(bs, (request.from + dev_offset) / 512, |
629 | b2e3d87f | Nick Thomas | data + NBD_REPLY_SIZE, |
630 | b2e3d87f | Nick Thomas | request.len / 512) == -1) { |
631 | b2e3d87f | Nick Thomas | LOG("reading from file failed");
|
632 | b2e3d87f | Nick Thomas | errno = EINVAL; |
633 | b2e3d87f | Nick Thomas | return -1; |
634 | b2e3d87f | Nick Thomas | } |
635 | b2e3d87f | Nick Thomas | *offset += request.len; |
636 | b2e3d87f | Nick Thomas | |
637 | b2e3d87f | Nick Thomas | TRACE("Read %u byte(s)", request.len);
|
638 | b2e3d87f | Nick Thomas | |
639 | b2e3d87f | Nick Thomas | /* Reply
|
640 | b2e3d87f | Nick Thomas | [ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
641 | b2e3d87f | Nick Thomas | [ 4 .. 7] error (0 == no error)
|
642 | b2e3d87f | Nick Thomas | [ 7 .. 15] handle
|
643 | b2e3d87f | Nick Thomas | */
|
644 | b2e3d87f | Nick Thomas | |
645 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)data, NBD_REPLY_MAGIC); |
646 | b2e3d87f | Nick Thomas | cpu_to_be32w((uint32_t*)(data + 4), reply.error);
|
647 | b2e3d87f | Nick Thomas | cpu_to_be64w((uint64_t*)(data + 8), reply.handle);
|
648 | b2e3d87f | Nick Thomas | |
649 | b2e3d87f | Nick Thomas | TRACE("Sending data to client");
|
650 | b2e3d87f | Nick Thomas | |
651 | b2e3d87f | Nick Thomas | if (write_sync(csock, data,
|
652 | b2e3d87f | Nick Thomas | request.len + NBD_REPLY_SIZE) != |
653 | b2e3d87f | Nick Thomas | request.len + NBD_REPLY_SIZE) { |
654 | b2e3d87f | Nick Thomas | LOG("writing to socket failed");
|
655 | b2e3d87f | Nick Thomas | errno = EINVAL; |
656 | b2e3d87f | Nick Thomas | return -1; |
657 | b2e3d87f | Nick Thomas | } |
658 | b2e3d87f | Nick Thomas | break;
|
659 | b2e3d87f | Nick Thomas | case NBD_CMD_WRITE:
|
660 | b2e3d87f | Nick Thomas | TRACE("Request type is WRITE");
|
661 | b2e3d87f | Nick Thomas | |
662 | b2e3d87f | Nick Thomas | TRACE("Reading %u byte(s)", request.len);
|
663 | b2e3d87f | Nick Thomas | |
664 | b2e3d87f | Nick Thomas | if (read_sync(csock, data, request.len) != request.len) {
|
665 | b2e3d87f | Nick Thomas | LOG("reading from socket failed");
|
666 | b2e3d87f | Nick Thomas | errno = EINVAL; |
667 | b2e3d87f | Nick Thomas | return -1; |
668 | b2e3d87f | Nick Thomas | } |
669 | b2e3d87f | Nick Thomas | |
670 | b90fb4b8 | Paolo Bonzini | if (nbdflags & NBD_FLAG_READ_ONLY) {
|
671 | b2e3d87f | Nick Thomas | TRACE("Server is read-only, return error");
|
672 | b2e3d87f | Nick Thomas | reply.error = 1;
|
673 | b2e3d87f | Nick Thomas | } else {
|
674 | b2e3d87f | Nick Thomas | TRACE("Writing to device");
|
675 | b2e3d87f | Nick Thomas | |
676 | b2e3d87f | Nick Thomas | if (bdrv_write(bs, (request.from + dev_offset) / 512, |
677 | b2e3d87f | Nick Thomas | data, request.len / 512) == -1) { |
678 | b2e3d87f | Nick Thomas | LOG("writing to file failed");
|
679 | b2e3d87f | Nick Thomas | errno = EINVAL; |
680 | b2e3d87f | Nick Thomas | return -1; |
681 | b2e3d87f | Nick Thomas | } |
682 | b2e3d87f | Nick Thomas | |
683 | b2e3d87f | Nick Thomas | *offset += request.len; |
684 | b2e3d87f | Nick Thomas | } |
685 | b2e3d87f | Nick Thomas | |
686 | b2e3d87f | Nick Thomas | if (nbd_send_reply(csock, &reply) == -1) |
687 | b2e3d87f | Nick Thomas | return -1; |
688 | b2e3d87f | Nick Thomas | break;
|
689 | b2e3d87f | Nick Thomas | case NBD_CMD_DISC:
|
690 | b2e3d87f | Nick Thomas | TRACE("Request type is DISCONNECT");
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691 | b2e3d87f | Nick Thomas | errno = 0;
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692 | b2e3d87f | Nick Thomas | return 1; |
693 | b2e3d87f | Nick Thomas | default:
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694 | b2e3d87f | Nick Thomas | LOG("invalid request type (%u) received", request.type);
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695 | b2e3d87f | Nick Thomas | errno = EINVAL; |
696 | b2e3d87f | Nick Thomas | return -1; |
697 | b2e3d87f | Nick Thomas | } |
698 | b2e3d87f | Nick Thomas | |
699 | b2e3d87f | Nick Thomas | TRACE("Request/Reply complete");
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700 | b2e3d87f | Nick Thomas | |
701 | b2e3d87f | Nick Thomas | return 0; |
702 | 7a5ca864 | bellard | } |