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/*
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---|---|
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* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
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*
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* Network Block Device
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "nbd.h" |
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|
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#include <errno.h> |
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#include <string.h> |
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#include <sys/ioctl.h> |
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#ifdef __sun__
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#include <sys/ioccom.h> |
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#endif
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#include <ctype.h> |
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#include <inttypes.h> |
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#include <sys/socket.h> |
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#include <sys/un.h> |
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#include <netinet/in.h> |
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#include <netinet/tcp.h> |
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#include <arpa/inet.h> |
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#include <netdb.h> |
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|
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#if defined(QEMU_NBD)
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extern int verbose; |
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#else
|
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static int verbose = 0; |
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#endif
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|
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#define TRACE(msg, ...) do { \ |
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if (verbose) LOG(msg, ## __VA_ARGS__); \ |
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} while(0) |
46 |
|
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#define LOG(msg, ...) do { \ |
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fprintf(stderr, "%s:%s():L%d: " msg "\n", \ |
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__FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ |
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} while(0) |
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|
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/* This is all part of the "official" NBD API */
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|
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#define NBD_REQUEST_MAGIC 0x25609513 |
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#define NBD_REPLY_MAGIC 0x67446698 |
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|
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#define NBD_SET_SOCK _IO(0xab, 0) |
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#define NBD_SET_BLKSIZE _IO(0xab, 1) |
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#define NBD_SET_SIZE _IO(0xab, 2) |
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#define NBD_DO_IT _IO(0xab, 3) |
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#define NBD_CLEAR_SOCK _IO(0xab, 4) |
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#define NBD_CLEAR_QUE _IO(0xab, 5) |
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#define NBD_PRINT_DEBUG _IO(0xab, 6) |
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#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) |
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#define NBD_DISCONNECT _IO(0xab, 8) |
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|
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/* That's all folks */
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|
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#define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true) |
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#define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false) |
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|
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size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read) |
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{ |
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size_t offset = 0;
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|
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while (offset < size) {
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ssize_t len; |
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|
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if (do_read) {
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len = read(fd, buffer + offset, size - offset); |
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} else {
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len = write(fd, buffer + offset, size - offset); |
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} |
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|
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/* recoverable error */
|
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if (len == -1 && (errno == EAGAIN || errno == EINTR)) { |
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continue;
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} |
89 |
|
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/* eof */
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if (len == 0) { |
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break;
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} |
94 |
|
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/* unrecoverable error */
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if (len == -1) { |
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return 0; |
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} |
99 |
|
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offset += len; |
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} |
102 |
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return offset;
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} |
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int tcp_socket_outgoing(const char *address, uint16_t port) |
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{ |
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int s;
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struct in_addr in;
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struct sockaddr_in addr;
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int serrno;
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s = socket(PF_INET, SOCK_STREAM, 0);
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if (s == -1) { |
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return -1; |
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} |
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|
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if (inet_aton(address, &in) == 0) { |
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struct hostent *ent;
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|
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ent = gethostbyname(address); |
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if (ent == NULL) { |
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goto error;
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} |
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memcpy(&in, ent->h_addr, sizeof(in));
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} |
128 |
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addr.sin_family = AF_INET; |
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addr.sin_port = htons(port); |
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memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
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|
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if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
136 |
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return s;
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error:
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serrno = errno; |
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close(s); |
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errno = serrno; |
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return -1; |
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} |
144 |
|
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int tcp_socket_incoming(const char *address, uint16_t port) |
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{ |
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int s;
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struct in_addr in;
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struct sockaddr_in addr;
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int serrno;
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int opt;
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|
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s = socket(PF_INET, SOCK_STREAM, 0);
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if (s == -1) { |
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return -1; |
156 |
} |
157 |
|
158 |
if (inet_aton(address, &in) == 0) { |
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struct hostent *ent;
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|
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ent = gethostbyname(address); |
162 |
if (ent == NULL) { |
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goto error;
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} |
165 |
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memcpy(&in, ent->h_addr, sizeof(in));
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} |
168 |
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addr.sin_family = AF_INET; |
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addr.sin_port = htons(port); |
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memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
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opt = 1;
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if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1) { |
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goto error;
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} |
177 |
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
181 |
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if (listen(s, 128) == -1) { |
183 |
goto error;
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} |
185 |
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return s;
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error:
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serrno = errno; |
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close(s); |
190 |
errno = serrno; |
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return -1; |
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} |
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int unix_socket_incoming(const char *path) |
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{ |
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int s;
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struct sockaddr_un addr;
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int serrno;
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s = socket(PF_UNIX, SOCK_STREAM, 0);
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if (s == -1) { |
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return -1; |
203 |
} |
204 |
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memset(&addr, 0, sizeof(addr)); |
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addr.sun_family = AF_UNIX; |
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pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
212 |
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if (listen(s, 128) == -1) { |
214 |
goto error;
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} |
216 |
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return s;
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error:
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serrno = errno; |
220 |
close(s); |
221 |
errno = serrno; |
222 |
return -1; |
223 |
} |
224 |
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int unix_socket_outgoing(const char *path) |
226 |
{ |
227 |
int s;
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struct sockaddr_un addr;
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int serrno;
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230 |
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s = socket(PF_UNIX, SOCK_STREAM, 0);
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if (s == -1) { |
233 |
return -1; |
234 |
} |
235 |
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memset(&addr, 0, sizeof(addr)); |
237 |
addr.sun_family = AF_UNIX; |
238 |
pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
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if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
241 |
goto error;
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242 |
} |
243 |
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return s;
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error:
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serrno = errno; |
247 |
close(s); |
248 |
errno = serrno; |
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return -1; |
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} |
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/* Basic flow
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Server Client
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Negotiate
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Request
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Response
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Request
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Response
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...
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...
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Request (type == 2)
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*/
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int nbd_negotiate(BlockDriverState *bs, int csock, off_t size) |
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{ |
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char buf[8 + 8 + 8 + 128]; |
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/* Negotiate
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[ 0 .. 7] passwd ("NBDMAGIC")
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[ 8 .. 15] magic (0x00420281861253)
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[16 .. 23] size
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[24 .. 151] reserved (0)
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*/
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TRACE("Beginning negotiation.");
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memcpy(buf, "NBDMAGIC", 8); |
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cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); |
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cpu_to_be64w((uint64_t*)(buf + 16), size);
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memset(buf + 24, 0, 128); |
283 |
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if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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LOG("write failed");
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errno = EINVAL; |
287 |
return -1; |
288 |
} |
289 |
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TRACE("Negotation succeeded.");
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return 0; |
293 |
} |
294 |
|
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int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize) |
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{ |
297 |
char buf[8 + 8 + 8 + 128]; |
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uint64_t magic; |
299 |
|
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TRACE("Receiving negotation.");
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|
302 |
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
303 |
LOG("read failed");
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errno = EINVAL; |
305 |
return -1; |
306 |
} |
307 |
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magic = be64_to_cpup((uint64_t*)(buf + 8));
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*size = be64_to_cpup((uint64_t*)(buf + 16));
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*blocksize = 1024;
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311 |
|
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TRACE("Magic is %c%c%c%c%c%c%c%c",
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isprint(buf[0]) ? buf[0] : '.', |
314 |
isprint(buf[1]) ? buf[1] : '.', |
315 |
isprint(buf[2]) ? buf[2] : '.', |
316 |
isprint(buf[3]) ? buf[3] : '.', |
317 |
isprint(buf[4]) ? buf[4] : '.', |
318 |
isprint(buf[5]) ? buf[5] : '.', |
319 |
isprint(buf[6]) ? buf[6] : '.', |
320 |
isprint(buf[7]) ? buf[7] : '.'); |
321 |
TRACE("Magic is 0x%" PRIx64, magic);
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322 |
TRACE("Size is %" PRIu64, *size);
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323 |
|
324 |
if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
325 |
LOG("Invalid magic received");
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326 |
errno = EINVAL; |
327 |
return -1; |
328 |
} |
329 |
|
330 |
TRACE("Checking magic");
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331 |
|
332 |
if (magic != 0x00420281861253LL) { |
333 |
LOG("Bad magic received");
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334 |
errno = EINVAL; |
335 |
return -1; |
336 |
} |
337 |
return 0; |
338 |
} |
339 |
|
340 |
int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
341 |
{ |
342 |
TRACE("Setting block size to %lu", (unsigned long)blocksize); |
343 |
|
344 |
if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
345 |
int serrno = errno;
|
346 |
LOG("Failed setting NBD block size");
|
347 |
errno = serrno; |
348 |
return -1; |
349 |
} |
350 |
|
351 |
TRACE("Setting size to %llu block(s)",
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352 |
(unsigned long long)(size / blocksize)); |
353 |
|
354 |
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
355 |
int serrno = errno;
|
356 |
LOG("Failed setting size (in blocks)");
|
357 |
errno = serrno; |
358 |
return -1; |
359 |
} |
360 |
|
361 |
TRACE("Clearing NBD socket");
|
362 |
|
363 |
if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
364 |
int serrno = errno;
|
365 |
LOG("Failed clearing NBD socket");
|
366 |
errno = serrno; |
367 |
return -1; |
368 |
} |
369 |
|
370 |
TRACE("Setting NBD socket");
|
371 |
|
372 |
if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
373 |
int serrno = errno;
|
374 |
LOG("Failed to set NBD socket");
|
375 |
errno = serrno; |
376 |
return -1; |
377 |
} |
378 |
|
379 |
TRACE("Negotiation ended");
|
380 |
|
381 |
return 0; |
382 |
} |
383 |
|
384 |
int nbd_disconnect(int fd) |
385 |
{ |
386 |
ioctl(fd, NBD_CLEAR_QUE); |
387 |
ioctl(fd, NBD_DISCONNECT); |
388 |
ioctl(fd, NBD_CLEAR_SOCK); |
389 |
return 0; |
390 |
} |
391 |
|
392 |
int nbd_client(int fd, int csock) |
393 |
{ |
394 |
int ret;
|
395 |
int serrno;
|
396 |
|
397 |
TRACE("Doing NBD loop");
|
398 |
|
399 |
ret = ioctl(fd, NBD_DO_IT); |
400 |
serrno = errno; |
401 |
|
402 |
TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
403 |
|
404 |
TRACE("Clearing NBD queue");
|
405 |
ioctl(fd, NBD_CLEAR_QUE); |
406 |
|
407 |
TRACE("Clearing NBD socket");
|
408 |
ioctl(fd, NBD_CLEAR_SOCK); |
409 |
|
410 |
errno = serrno; |
411 |
return ret;
|
412 |
} |
413 |
|
414 |
int nbd_send_request(int csock, struct nbd_request *request) |
415 |
{ |
416 |
uint8_t buf[4 + 4 + 8 + 8 + 4]; |
417 |
|
418 |
cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
419 |
cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
420 |
cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
421 |
cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
422 |
cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
423 |
|
424 |
TRACE("Sending request to client");
|
425 |
|
426 |
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
427 |
LOG("writing to socket failed");
|
428 |
errno = EINVAL; |
429 |
return -1; |
430 |
} |
431 |
return 0; |
432 |
} |
433 |
|
434 |
|
435 |
static int nbd_receive_request(int csock, struct nbd_request *request) |
436 |
{ |
437 |
uint8_t buf[4 + 4 + 8 + 8 + 4]; |
438 |
uint32_t magic; |
439 |
|
440 |
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
441 |
LOG("read failed");
|
442 |
errno = EINVAL; |
443 |
return -1; |
444 |
} |
445 |
|
446 |
/* Request
|
447 |
[ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
448 |
[ 4 .. 7] type (0 == READ, 1 == WRITE)
|
449 |
[ 8 .. 15] handle
|
450 |
[16 .. 23] from
|
451 |
[24 .. 27] len
|
452 |
*/
|
453 |
|
454 |
magic = be32_to_cpup((uint32_t*)buf); |
455 |
request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
456 |
request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
457 |
request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
458 |
request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
459 |
|
460 |
TRACE("Got request: "
|
461 |
"{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
462 |
magic, request->type, request->from, request->len); |
463 |
|
464 |
if (magic != NBD_REQUEST_MAGIC) {
|
465 |
LOG("invalid magic (got 0x%x)", magic);
|
466 |
errno = EINVAL; |
467 |
return -1; |
468 |
} |
469 |
return 0; |
470 |
} |
471 |
|
472 |
int nbd_receive_reply(int csock, struct nbd_reply *reply) |
473 |
{ |
474 |
uint8_t buf[4 + 4 + 8]; |
475 |
uint32_t magic; |
476 |
|
477 |
memset(buf, 0xAA, sizeof(buf)); |
478 |
|
479 |
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
480 |
LOG("read failed");
|
481 |
errno = EINVAL; |
482 |
return -1; |
483 |
} |
484 |
|
485 |
/* Reply
|
486 |
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
487 |
[ 4 .. 7] error (0 == no error)
|
488 |
[ 7 .. 15] handle
|
489 |
*/
|
490 |
|
491 |
magic = be32_to_cpup((uint32_t*)buf); |
492 |
reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
493 |
reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
494 |
|
495 |
TRACE("Got reply: "
|
496 |
"{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
497 |
magic, reply->error, reply->handle); |
498 |
|
499 |
if (magic != NBD_REPLY_MAGIC) {
|
500 |
LOG("invalid magic (got 0x%x)", magic);
|
501 |
errno = EINVAL; |
502 |
return -1; |
503 |
} |
504 |
return 0; |
505 |
} |
506 |
|
507 |
static int nbd_send_reply(int csock, struct nbd_reply *reply) |
508 |
{ |
509 |
uint8_t buf[4 + 4 + 8]; |
510 |
|
511 |
/* Reply
|
512 |
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
513 |
[ 4 .. 7] error (0 == no error)
|
514 |
[ 7 .. 15] handle
|
515 |
*/
|
516 |
cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
517 |
cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
518 |
cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
519 |
|
520 |
TRACE("Sending response to client");
|
521 |
|
522 |
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
523 |
LOG("writing to socket failed");
|
524 |
errno = EINVAL; |
525 |
return -1; |
526 |
} |
527 |
return 0; |
528 |
} |
529 |
|
530 |
int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
531 |
off_t *offset, bool readonly, uint8_t *data, int data_size) |
532 |
{ |
533 |
struct nbd_request request;
|
534 |
struct nbd_reply reply;
|
535 |
|
536 |
TRACE("Reading request.");
|
537 |
|
538 |
if (nbd_receive_request(csock, &request) == -1) |
539 |
return -1; |
540 |
|
541 |
if (request.len > data_size) {
|
542 |
LOG("len (%u) is larger than max len (%u)",
|
543 |
request.len, data_size); |
544 |
errno = EINVAL; |
545 |
return -1; |
546 |
} |
547 |
|
548 |
if ((request.from + request.len) < request.from) {
|
549 |
LOG("integer overflow detected! "
|
550 |
"you're probably being attacked");
|
551 |
errno = EINVAL; |
552 |
return -1; |
553 |
} |
554 |
|
555 |
if ((request.from + request.len) > size) {
|
556 |
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
557 |
", Offset: %" PRIu64 "\n", |
558 |
request.from, request.len, size, dev_offset); |
559 |
LOG("requested operation past EOF--bad client?");
|
560 |
errno = EINVAL; |
561 |
return -1; |
562 |
} |
563 |
|
564 |
TRACE("Decoding type");
|
565 |
|
566 |
reply.handle = request.handle; |
567 |
reply.error = 0;
|
568 |
|
569 |
switch (request.type) {
|
570 |
case NBD_CMD_READ:
|
571 |
TRACE("Request type is READ");
|
572 |
|
573 |
if (bdrv_read(bs, (request.from + dev_offset) / 512, data, |
574 |
request.len / 512) == -1) { |
575 |
LOG("reading from file failed");
|
576 |
errno = EINVAL; |
577 |
return -1; |
578 |
} |
579 |
*offset += request.len; |
580 |
|
581 |
TRACE("Read %u byte(s)", request.len);
|
582 |
|
583 |
if (nbd_send_reply(csock, &reply) == -1) |
584 |
return -1; |
585 |
|
586 |
TRACE("Sending data to client");
|
587 |
|
588 |
if (write_sync(csock, data, request.len) != request.len) {
|
589 |
LOG("writing to socket failed");
|
590 |
errno = EINVAL; |
591 |
return -1; |
592 |
} |
593 |
break;
|
594 |
case NBD_CMD_WRITE:
|
595 |
TRACE("Request type is WRITE");
|
596 |
|
597 |
TRACE("Reading %u byte(s)", request.len);
|
598 |
|
599 |
if (read_sync(csock, data, request.len) != request.len) {
|
600 |
LOG("reading from socket failed");
|
601 |
errno = EINVAL; |
602 |
return -1; |
603 |
} |
604 |
|
605 |
if (readonly) {
|
606 |
TRACE("Server is read-only, return error");
|
607 |
reply.error = 1;
|
608 |
} else {
|
609 |
TRACE("Writing to device");
|
610 |
|
611 |
if (bdrv_write(bs, (request.from + dev_offset) / 512, |
612 |
data, request.len / 512) == -1) { |
613 |
LOG("writing to file failed");
|
614 |
errno = EINVAL; |
615 |
return -1; |
616 |
} |
617 |
|
618 |
*offset += request.len; |
619 |
} |
620 |
|
621 |
if (nbd_send_reply(csock, &reply) == -1) |
622 |
return -1; |
623 |
break;
|
624 |
case NBD_CMD_DISC:
|
625 |
TRACE("Request type is DISCONNECT");
|
626 |
errno = 0;
|
627 |
return 1; |
628 |
default:
|
629 |
LOG("invalid request type (%u) received", request.type);
|
630 |
errno = EINVAL; |
631 |
return -1; |
632 |
} |
633 |
|
634 |
TRACE("Request/Reply complete");
|
635 |
|
636 |
return 0; |
637 |
} |