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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, see <http://www.gnu.org/licenses/>.
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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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#ifndef _WIN32
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#include <sys/ioctl.h> |
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#endif
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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 "qemu_socket.h" |
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|
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//#define DEBUG_NBD
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#ifdef DEBUG_NBD
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#define TRACE(msg, ...) do { \ |
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LOG(msg, ## __VA_ARGS__); \ |
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} while(0) |
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#else
|
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#define TRACE(msg, ...) \
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do { } while (0) |
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#endif
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|
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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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/* This is all part of the "official" NBD API */
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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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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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while (offset < size) {
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ssize_t len; |
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if (do_read) {
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len = recv(fd, buffer + offset, size - offset, 0);
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} else {
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len = send(fd, buffer + offset, size - offset, 0);
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} |
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if (len == -1) |
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errno = socket_error(); |
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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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} |
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/* eof */
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if (len == 0) { |
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break;
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} |
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/* unrecoverable error */
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if (len == -1) { |
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return 0; |
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} |
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offset += len; |
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} |
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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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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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if (inet_aton(address, &in) == 0) { |
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struct hostent *ent;
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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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} |
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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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if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
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return s;
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error:
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closesocket(s); |
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return -1; |
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} |
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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 opt;
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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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if (inet_aton(address, &in) == 0) { |
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struct hostent *ent;
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ent = gethostbyname(address); |
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if (ent == NULL) { |
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goto error;
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} |
162 |
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memcpy(&in, ent->h_addr, sizeof(in));
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} |
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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,
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(const void *) &opt, sizeof(opt)) == -1) { |
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goto error;
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} |
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
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if (listen(s, 128) == -1) { |
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goto error;
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} |
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return s;
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error:
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closesocket(s); |
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return -1; |
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} |
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#ifndef _WIN32
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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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s = socket(PF_UNIX, SOCK_STREAM, 0);
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if (s == -1) { |
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return -1; |
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} |
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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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} |
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if (listen(s, 128) == -1) { |
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goto error;
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} |
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return s;
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error:
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closesocket(s); |
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return -1; |
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} |
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int unix_socket_outgoing(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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s = socket(PF_UNIX, SOCK_STREAM, 0);
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if (s == -1) { |
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return -1; |
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} |
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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 (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { |
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goto error;
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} |
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return s;
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error:
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closesocket(s); |
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return -1; |
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} |
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#else
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int unix_socket_incoming(const char *path) |
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{ |
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errno = ENOTSUP; |
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return -1; |
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} |
248 |
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int unix_socket_outgoing(const char *path) |
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{ |
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errno = ENOTSUP; |
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return -1; |
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} |
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#endif
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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(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); |
287 |
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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; |
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return -1; |
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} |
293 |
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TRACE("Negotation succeeded.");
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return 0; |
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} |
298 |
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int nbd_receive_negotiate(int csock, off_t *size, size_t *blocksize) |
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{ |
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char buf[8 + 8 + 8 + 128]; |
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uint64_t magic; |
303 |
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TRACE("Receiving negotation.");
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if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
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LOG("read failed");
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errno = EINVAL; |
309 |
return -1; |
310 |
} |
311 |
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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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315 |
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TRACE("Magic is %c%c%c%c%c%c%c%c",
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qemu_isprint(buf[0]) ? buf[0] : '.', |
318 |
qemu_isprint(buf[1]) ? buf[1] : '.', |
319 |
qemu_isprint(buf[2]) ? buf[2] : '.', |
320 |
qemu_isprint(buf[3]) ? buf[3] : '.', |
321 |
qemu_isprint(buf[4]) ? buf[4] : '.', |
322 |
qemu_isprint(buf[5]) ? buf[5] : '.', |
323 |
qemu_isprint(buf[6]) ? buf[6] : '.', |
324 |
qemu_isprint(buf[7]) ? buf[7] : '.'); |
325 |
TRACE("Magic is 0x%" PRIx64, magic);
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326 |
TRACE("Size is %" PRIu64, *size);
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327 |
|
328 |
if (memcmp(buf, "NBDMAGIC", 8) != 0) { |
329 |
LOG("Invalid magic received");
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330 |
errno = EINVAL; |
331 |
return -1; |
332 |
} |
333 |
|
334 |
TRACE("Checking magic");
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335 |
|
336 |
if (magic != 0x00420281861253LL) { |
337 |
LOG("Bad magic received");
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338 |
errno = EINVAL; |
339 |
return -1; |
340 |
} |
341 |
return 0; |
342 |
} |
343 |
|
344 |
#ifndef _WIN32
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345 |
int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
346 |
{ |
347 |
TRACE("Setting block size to %lu", (unsigned long)blocksize); |
348 |
|
349 |
if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) { |
350 |
int serrno = errno;
|
351 |
LOG("Failed setting NBD block size");
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352 |
errno = serrno; |
353 |
return -1; |
354 |
} |
355 |
|
356 |
TRACE("Setting size to %llu block(s)",
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357 |
(unsigned long long)(size / blocksize)); |
358 |
|
359 |
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) { |
360 |
int serrno = errno;
|
361 |
LOG("Failed setting size (in blocks)");
|
362 |
errno = serrno; |
363 |
return -1; |
364 |
} |
365 |
|
366 |
TRACE("Clearing NBD socket");
|
367 |
|
368 |
if (ioctl(fd, NBD_CLEAR_SOCK) == -1) { |
369 |
int serrno = errno;
|
370 |
LOG("Failed clearing NBD socket");
|
371 |
errno = serrno; |
372 |
return -1; |
373 |
} |
374 |
|
375 |
TRACE("Setting NBD socket");
|
376 |
|
377 |
if (ioctl(fd, NBD_SET_SOCK, csock) == -1) { |
378 |
int serrno = errno;
|
379 |
LOG("Failed to set NBD socket");
|
380 |
errno = serrno; |
381 |
return -1; |
382 |
} |
383 |
|
384 |
TRACE("Negotiation ended");
|
385 |
|
386 |
return 0; |
387 |
} |
388 |
|
389 |
int nbd_disconnect(int fd) |
390 |
{ |
391 |
ioctl(fd, NBD_CLEAR_QUE); |
392 |
ioctl(fd, NBD_DISCONNECT); |
393 |
ioctl(fd, NBD_CLEAR_SOCK); |
394 |
return 0; |
395 |
} |
396 |
|
397 |
int nbd_client(int fd, int csock) |
398 |
{ |
399 |
int ret;
|
400 |
int serrno;
|
401 |
|
402 |
TRACE("Doing NBD loop");
|
403 |
|
404 |
ret = ioctl(fd, NBD_DO_IT); |
405 |
serrno = errno; |
406 |
|
407 |
TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
408 |
|
409 |
TRACE("Clearing NBD queue");
|
410 |
ioctl(fd, NBD_CLEAR_QUE); |
411 |
|
412 |
TRACE("Clearing NBD socket");
|
413 |
ioctl(fd, NBD_CLEAR_SOCK); |
414 |
|
415 |
errno = serrno; |
416 |
return ret;
|
417 |
} |
418 |
#else
|
419 |
int nbd_init(int fd, int csock, off_t size, size_t blocksize) |
420 |
{ |
421 |
errno = ENOTSUP; |
422 |
return -1; |
423 |
} |
424 |
|
425 |
int nbd_disconnect(int fd) |
426 |
{ |
427 |
errno = ENOTSUP; |
428 |
return -1; |
429 |
} |
430 |
|
431 |
int nbd_client(int fd, int csock) |
432 |
{ |
433 |
errno = ENOTSUP; |
434 |
return -1; |
435 |
} |
436 |
#endif
|
437 |
|
438 |
int nbd_send_request(int csock, struct nbd_request *request) |
439 |
{ |
440 |
uint8_t buf[4 + 4 + 8 + 8 + 4]; |
441 |
|
442 |
cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC); |
443 |
cpu_to_be32w((uint32_t*)(buf + 4), request->type);
|
444 |
cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
|
445 |
cpu_to_be64w((uint64_t*)(buf + 16), request->from);
|
446 |
cpu_to_be32w((uint32_t*)(buf + 24), request->len);
|
447 |
|
448 |
TRACE("Sending request to client");
|
449 |
|
450 |
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
451 |
LOG("writing to socket failed");
|
452 |
errno = EINVAL; |
453 |
return -1; |
454 |
} |
455 |
return 0; |
456 |
} |
457 |
|
458 |
|
459 |
static int nbd_receive_request(int csock, struct nbd_request *request) |
460 |
{ |
461 |
uint8_t buf[4 + 4 + 8 + 8 + 4]; |
462 |
uint32_t magic; |
463 |
|
464 |
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
465 |
LOG("read failed");
|
466 |
errno = EINVAL; |
467 |
return -1; |
468 |
} |
469 |
|
470 |
/* Request
|
471 |
[ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
472 |
[ 4 .. 7] type (0 == READ, 1 == WRITE)
|
473 |
[ 8 .. 15] handle
|
474 |
[16 .. 23] from
|
475 |
[24 .. 27] len
|
476 |
*/
|
477 |
|
478 |
magic = be32_to_cpup((uint32_t*)buf); |
479 |
request->type = be32_to_cpup((uint32_t*)(buf + 4));
|
480 |
request->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
481 |
request->from = be64_to_cpup((uint64_t*)(buf + 16));
|
482 |
request->len = be32_to_cpup((uint32_t*)(buf + 24));
|
483 |
|
484 |
TRACE("Got request: "
|
485 |
"{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }", |
486 |
magic, request->type, request->from, request->len); |
487 |
|
488 |
if (magic != NBD_REQUEST_MAGIC) {
|
489 |
LOG("invalid magic (got 0x%x)", magic);
|
490 |
errno = EINVAL; |
491 |
return -1; |
492 |
} |
493 |
return 0; |
494 |
} |
495 |
|
496 |
int nbd_receive_reply(int csock, struct nbd_reply *reply) |
497 |
{ |
498 |
uint8_t buf[4 + 4 + 8]; |
499 |
uint32_t magic; |
500 |
|
501 |
memset(buf, 0xAA, sizeof(buf)); |
502 |
|
503 |
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
504 |
LOG("read failed");
|
505 |
errno = EINVAL; |
506 |
return -1; |
507 |
} |
508 |
|
509 |
/* Reply
|
510 |
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
511 |
[ 4 .. 7] error (0 == no error)
|
512 |
[ 7 .. 15] handle
|
513 |
*/
|
514 |
|
515 |
magic = be32_to_cpup((uint32_t*)buf); |
516 |
reply->error = be32_to_cpup((uint32_t*)(buf + 4));
|
517 |
reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
|
518 |
|
519 |
TRACE("Got reply: "
|
520 |
"{ magic = 0x%x, .error = %d, handle = %" PRIu64" }", |
521 |
magic, reply->error, reply->handle); |
522 |
|
523 |
if (magic != NBD_REPLY_MAGIC) {
|
524 |
LOG("invalid magic (got 0x%x)", magic);
|
525 |
errno = EINVAL; |
526 |
return -1; |
527 |
} |
528 |
return 0; |
529 |
} |
530 |
|
531 |
static int nbd_send_reply(int csock, struct nbd_reply *reply) |
532 |
{ |
533 |
uint8_t buf[4 + 4 + 8]; |
534 |
|
535 |
/* Reply
|
536 |
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
537 |
[ 4 .. 7] error (0 == no error)
|
538 |
[ 7 .. 15] handle
|
539 |
*/
|
540 |
cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC); |
541 |
cpu_to_be32w((uint32_t*)(buf + 4), reply->error);
|
542 |
cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
|
543 |
|
544 |
TRACE("Sending response to client");
|
545 |
|
546 |
if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { |
547 |
LOG("writing to socket failed");
|
548 |
errno = EINVAL; |
549 |
return -1; |
550 |
} |
551 |
return 0; |
552 |
} |
553 |
|
554 |
int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, |
555 |
off_t *offset, bool readonly, uint8_t *data, int data_size) |
556 |
{ |
557 |
struct nbd_request request;
|
558 |
struct nbd_reply reply;
|
559 |
|
560 |
TRACE("Reading request.");
|
561 |
|
562 |
if (nbd_receive_request(csock, &request) == -1) |
563 |
return -1; |
564 |
|
565 |
if (request.len > data_size) {
|
566 |
LOG("len (%u) is larger than max len (%u)",
|
567 |
request.len, data_size); |
568 |
errno = EINVAL; |
569 |
return -1; |
570 |
} |
571 |
|
572 |
if ((request.from + request.len) < request.from) {
|
573 |
LOG("integer overflow detected! "
|
574 |
"you're probably being attacked");
|
575 |
errno = EINVAL; |
576 |
return -1; |
577 |
} |
578 |
|
579 |
if ((request.from + request.len) > size) {
|
580 |
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64 |
581 |
", Offset: %" PRIu64 "\n", |
582 |
request.from, request.len, (uint64_t)size, dev_offset); |
583 |
LOG("requested operation past EOF--bad client?");
|
584 |
errno = EINVAL; |
585 |
return -1; |
586 |
} |
587 |
|
588 |
TRACE("Decoding type");
|
589 |
|
590 |
reply.handle = request.handle; |
591 |
reply.error = 0;
|
592 |
|
593 |
switch (request.type) {
|
594 |
case NBD_CMD_READ:
|
595 |
TRACE("Request type is READ");
|
596 |
|
597 |
if (bdrv_read(bs, (request.from + dev_offset) / 512, data, |
598 |
request.len / 512) == -1) { |
599 |
LOG("reading from file failed");
|
600 |
errno = EINVAL; |
601 |
return -1; |
602 |
} |
603 |
*offset += request.len; |
604 |
|
605 |
TRACE("Read %u byte(s)", request.len);
|
606 |
|
607 |
if (nbd_send_reply(csock, &reply) == -1) |
608 |
return -1; |
609 |
|
610 |
TRACE("Sending data to client");
|
611 |
|
612 |
if (write_sync(csock, data, request.len) != request.len) {
|
613 |
LOG("writing to socket failed");
|
614 |
errno = EINVAL; |
615 |
return -1; |
616 |
} |
617 |
break;
|
618 |
case NBD_CMD_WRITE:
|
619 |
TRACE("Request type is WRITE");
|
620 |
|
621 |
TRACE("Reading %u byte(s)", request.len);
|
622 |
|
623 |
if (read_sync(csock, data, request.len) != request.len) {
|
624 |
LOG("reading from socket failed");
|
625 |
errno = EINVAL; |
626 |
return -1; |
627 |
} |
628 |
|
629 |
if (readonly) {
|
630 |
TRACE("Server is read-only, return error");
|
631 |
reply.error = 1;
|
632 |
} else {
|
633 |
TRACE("Writing to device");
|
634 |
|
635 |
if (bdrv_write(bs, (request.from + dev_offset) / 512, |
636 |
data, request.len / 512) == -1) { |
637 |
LOG("writing to file failed");
|
638 |
errno = EINVAL; |
639 |
return -1; |
640 |
} |
641 |
|
642 |
*offset += request.len; |
643 |
} |
644 |
|
645 |
if (nbd_send_reply(csock, &reply) == -1) |
646 |
return -1; |
647 |
break;
|
648 |
case NBD_CMD_DISC:
|
649 |
TRACE("Request type is DISCONNECT");
|
650 |
errno = 0;
|
651 |
return 1; |
652 |
default:
|
653 |
LOG("invalid request type (%u) received", request.type);
|
654 |
errno = EINVAL; |
655 |
return -1; |
656 |
} |
657 |
|
658 |
TRACE("Request/Reply complete");
|
659 |
|
660 |
return 0; |
661 |
} |