mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 09:55:55 +00:00
qemu-nbd tool (Anthony Liguori)
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4596 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
parent
e00c1e714e
commit
7a5ca8648b
14
Makefile
14
Makefile
|
@ -17,7 +17,7 @@ ifdef CONFIG_STATIC
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LDFLAGS += -static
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endif
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ifdef BUILD_DOCS
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DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1
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DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1 qemu-nbd.8
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else
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DOCS=
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endif
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@ -159,6 +159,10 @@ qemu-img-%.o: %.c
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%.o: %.c
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$(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $<
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qemu-nbd$(EXESUF): qemu-nbd.o nbd.o qemu-img-block.o \
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$(QEMU_IMG_BLOCK_OBJS)
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$(CC) $(LDFLAGS) -o $@ $^ -lz $(LIBS)
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# dyngen host tool
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dyngen$(EXESUF): dyngen.c
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$(HOST_CC) $(CFLAGS) $(CPPFLAGS) -o $@ $^
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@ -191,6 +195,8 @@ install-doc: $(DOCS)
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ifndef CONFIG_WIN32
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mkdir -p "$(DESTDIR)$(mandir)/man1"
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$(INSTALL) qemu.1 qemu-img.1 "$(DESTDIR)$(mandir)/man1"
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mkdir -p "$(DESTDIR)$(mandir)/man8"
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$(INSTALL) qemu-nbd.8 "$(DESTDIR)$(mandir)/man8"
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endif
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install: all $(if $(BUILD_DOCS),install-doc)
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@ -244,6 +250,10 @@ qemu-img.1: qemu-img.texi
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$(SRC_PATH)/texi2pod.pl $< qemu-img.pod
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pod2man --section=1 --center=" " --release=" " qemu-img.pod > $@
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qemu-nbd.8: qemu-nbd.texi
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$(SRC_PATH)/texi2pod.pl $< qemu-nbd.pod
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pod2man --section=8 --center=" " --release=" " qemu-nbd.pod > $@
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info: qemu-doc.info qemu-tech.info
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dvi: qemu-doc.dvi qemu-tech.dvi
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@ -296,6 +306,7 @@ tarbin:
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$(bindir)/qemu-sh4eb \
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$(bindir)/qemu-cris \
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$(bindir)/qemu-img \
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$(bindir)/qemu-nbd \
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$(datadir)/bios.bin \
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$(datadir)/vgabios.bin \
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$(datadir)/vgabios-cirrus.bin \
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@ -309,6 +320,7 @@ tarbin:
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$(docdir)/qemu-doc.html \
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$(docdir)/qemu-tech.html \
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$(mandir)/man1/qemu.1 $(mandir)/man1/qemu-img.1
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$(mandir)/man8/qemu-nbd.8
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# Include automatically generated dependency files
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-include $(wildcard *.d audio/*.d slirp/*.d)
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3
configure
vendored
3
configure
vendored
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@ -1105,6 +1105,9 @@ echo "#define CONFIG_UNAME_RELEASE \"$uname_release\"" >> $config_h
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tools=
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if test `expr "$target_list" : ".*softmmu.*"` != 0 ; then
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tools="qemu-img\$(EXESUF) $tools"
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if [ "$linux" = "yes" ] ; then
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tools="qemu-nbd\$(EXESUF) $tools"
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fi
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fi
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echo "TOOLS=$tools" >> $config_mak
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@ -126,7 +126,7 @@ static inline int tlb_set_page(CPUState *env1, target_ulong vaddr,
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#define CODE_GEN_BUFFER_SIZE (6 * 1024 * 1024)
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#else
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/* XXX: make it dynamic on x86 */
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#define CODE_GEN_BUFFER_SIZE (16 * 1024 * 1024)
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#define CODE_GEN_BUFFER_SIZE (64 * 1024 * 1024)
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#endif
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//#define CODE_GEN_BUFFER_SIZE (128 * 1024)
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500
nbd.c
Normal file
500
nbd.c
Normal file
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@ -0,0 +1,500 @@
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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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#include <errno.h>
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#include <string.h>
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#include <sys/ioctl.h>
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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 <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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extern int verbose;
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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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#define TRACE(msg, ...) do { \
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if (verbose) LOG(msg, ## __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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#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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/* That's all folks */
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#define read_sync(fd, buffer, size) wr_sync(fd, buffer, size, true)
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#define write_sync(fd, buffer, size) wr_sync(fd, buffer, size, false)
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static size_t 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 = 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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/* recoverable error */
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if (len == -1 && errno == EAGAIN) {
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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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static 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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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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serrno = errno;
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close(s);
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errno = serrno;
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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 serrno;
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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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}
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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, &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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serrno = errno;
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close(s);
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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);
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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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}
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TRACE("Negotation succeeded.");
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return 0;
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}
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int nbd_receive_negotiate(int fd, int csock)
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{
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char buf[8 + 8 + 8 + 128];
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uint64_t magic;
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off_t size;
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size_t blocksize;
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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;
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return -1;
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}
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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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TRACE("Magic is %c%c%c%c%c%c%c%c",
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isprint(buf[0]) ? buf[0] : '.',
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isprint(buf[1]) ? buf[1] : '.',
|
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isprint(buf[2]) ? buf[2] : '.',
|
||||
isprint(buf[3]) ? buf[3] : '.',
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||||
isprint(buf[4]) ? buf[4] : '.',
|
||||
isprint(buf[5]) ? buf[5] : '.',
|
||||
isprint(buf[6]) ? buf[6] : '.',
|
||||
isprint(buf[7]) ? buf[7] : '.');
|
||||
TRACE("Magic is 0x%" PRIx64, magic);
|
||||
TRACE("Size is %" PRIu64, size);
|
||||
|
||||
if (memcmp(buf, "NBDMAGIC", 8) != 0) {
|
||||
LOG("Invalid magic received");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Checking magic");
|
||||
|
||||
if (magic != 0x00420281861253LL) {
|
||||
LOG("Bad magic received");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Setting block size to %lu", (unsigned long)blocksize);
|
||||
|
||||
if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) {
|
||||
int serrno = errno;
|
||||
LOG("Failed setting NBD block size");
|
||||
errno = serrno;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Setting size to %llu block(s)",
|
||||
(unsigned long long)(size / blocksize));
|
||||
|
||||
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) {
|
||||
int serrno = errno;
|
||||
LOG("Failed setting size (in blocks)");
|
||||
errno = serrno;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Clearing NBD socket");
|
||||
|
||||
if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {
|
||||
int serrno = errno;
|
||||
LOG("Failed clearing NBD socket");
|
||||
errno = serrno;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Setting NBD socket");
|
||||
|
||||
if (ioctl(fd, NBD_SET_SOCK, csock) == -1) {
|
||||
int serrno = errno;
|
||||
LOG("Failed to set NBD socket");
|
||||
errno = serrno;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Negotiation ended");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int nbd_disconnect(int fd)
|
||||
{
|
||||
ioctl(fd, NBD_CLEAR_QUE);
|
||||
ioctl(fd, NBD_DISCONNECT);
|
||||
ioctl(fd, NBD_CLEAR_SOCK);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int nbd_client(int fd, int csock)
|
||||
{
|
||||
int ret;
|
||||
int serrno;
|
||||
|
||||
TRACE("Doing NBD loop");
|
||||
|
||||
ret = ioctl(fd, NBD_DO_IT);
|
||||
serrno = errno;
|
||||
|
||||
TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
|
||||
|
||||
TRACE("Clearing NBD queue");
|
||||
ioctl(fd, NBD_CLEAR_QUE);
|
||||
|
||||
TRACE("Clearing NBD socket");
|
||||
ioctl(fd, NBD_CLEAR_SOCK);
|
||||
|
||||
errno = serrno;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, off_t *offset, bool readonly)
|
||||
{
|
||||
#ifndef _REENTRANT
|
||||
static uint8_t data[1024 * 1024]; // keep this off of the stack
|
||||
#else
|
||||
uint8_t data[1024 * 1024];
|
||||
#endif
|
||||
uint8_t buf[4 + 4 + 8 + 8 + 4];
|
||||
uint32_t magic;
|
||||
uint32_t type;
|
||||
uint64_t from;
|
||||
uint32_t len;
|
||||
|
||||
TRACE("Reading request.");
|
||||
|
||||
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
|
||||
LOG("read failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Request
|
||||
[ 0 .. 3] magic (NBD_REQUEST_MAGIC)
|
||||
[ 4 .. 7] type (0 == READ, 1 == WRITE)
|
||||
[ 8 .. 15] handle
|
||||
[16 .. 23] from
|
||||
[24 .. 27] len
|
||||
*/
|
||||
|
||||
magic = be32_to_cpup((uint32_t*)buf);
|
||||
type = be32_to_cpup((uint32_t*)(buf + 4));
|
||||
from = be64_to_cpup((uint64_t*)(buf + 16));
|
||||
len = be32_to_cpup((uint32_t*)(buf + 24));
|
||||
|
||||
TRACE("Got request: "
|
||||
"{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }",
|
||||
magic, type, from, len);
|
||||
|
||||
|
||||
if (magic != NBD_REQUEST_MAGIC) {
|
||||
LOG("invalid magic (got 0x%x)", magic);
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (len > sizeof(data)) {
|
||||
LOG("len (%u) is larger than max len (%lu)",
|
||||
len, sizeof(data));
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if ((from + len) < from) {
|
||||
LOG("integer overflow detected! "
|
||||
"you're probably being attacked");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if ((from + len) > size) {
|
||||
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
|
||||
", Offset: %" PRIu64 "\n",
|
||||
from, len, size, dev_offset);
|
||||
LOG("requested operation past EOF--bad client?");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Reply
|
||||
[ 0 .. 3] magic (NBD_REPLY_MAGIC)
|
||||
[ 4 .. 7] error (0 == no error)
|
||||
[ 7 .. 15] handle
|
||||
*/
|
||||
cpu_to_be32w((uint32_t*)buf, NBD_REPLY_MAGIC);
|
||||
cpu_to_be32w((uint32_t*)(buf + 4), 0);
|
||||
|
||||
TRACE("Decoding type");
|
||||
|
||||
switch (type) {
|
||||
case 0:
|
||||
TRACE("Request type is READ");
|
||||
|
||||
if (bdrv_read(bs, (from + dev_offset) / 512, data, len / 512) == -1) {
|
||||
LOG("reading from file failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
*offset += len;
|
||||
|
||||
TRACE("Read %u byte(s)", len);
|
||||
|
||||
TRACE("Sending OK response");
|
||||
|
||||
if (write_sync(csock, buf, 16) != 16) {
|
||||
LOG("writing to socket failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Sending data to client");
|
||||
|
||||
if (write_sync(csock, data, len) != len) {
|
||||
LOG("writing to socket failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
break;
|
||||
case 1:
|
||||
TRACE("Request type is WRITE");
|
||||
|
||||
TRACE("Reading %u byte(s)", len);
|
||||
|
||||
if (read_sync(csock, data, len) != len) {
|
||||
LOG("reading from socket failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (readonly) {
|
||||
TRACE("Server is read-only, return error");
|
||||
|
||||
cpu_to_be32w((uint32_t*)(buf + 4), 1);
|
||||
} else {
|
||||
TRACE("Writing to device");
|
||||
|
||||
if (bdrv_write(bs, (from + dev_offset) / 512, data, len / 512) == -1) {
|
||||
LOG("writing to file failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
*offset += len;
|
||||
}
|
||||
|
||||
TRACE("Sending response to client");
|
||||
|
||||
if (write_sync(csock, buf, 16) != 16) {
|
||||
LOG("writing to socket failed");
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
break;
|
||||
case 2:
|
||||
TRACE("Request type is DISCONNECT");
|
||||
errno = 0;
|
||||
return 1;
|
||||
default:
|
||||
LOG("invalid request type (%u) received", type);
|
||||
errno = EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
TRACE("Request/Reply complete");
|
||||
|
||||
return 0;
|
||||
}
|
37
nbd.h
Normal file
37
nbd.h
Normal file
|
@ -0,0 +1,37 @@
|
|||
/*\
|
||||
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
|
||||
*
|
||||
* Network Block Device
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; under version 2 of the License.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
\*/
|
||||
|
||||
#ifndef NBD_H
|
||||
#define NBD_H
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
#include <qemu-common.h>
|
||||
#include "block_int.h"
|
||||
|
||||
int tcp_socket_incoming(const char *address, uint16_t port);
|
||||
|
||||
int nbd_negotiate(BlockDriverState *bs, int csock, off_t size);
|
||||
int nbd_receive_negotiate(int fd, int csock);
|
||||
int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, off_t *offset, bool readonly);
|
||||
int nbd_client(int fd, int csock);
|
||||
int nbd_disconnect(int fd);
|
||||
|
||||
#endif
|
275
qemu-nbd.c
Normal file
275
qemu-nbd.c
Normal file
|
@ -0,0 +1,275 @@
|
|||
/*\
|
||||
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
|
||||
*
|
||||
* Network Block Device
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; under version 2 of the License.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*/
|
||||
|
||||
#include <qemu-common.h>
|
||||
#include "block_int.h"
|
||||
#include "nbd.h"
|
||||
|
||||
#include <malloc.h>
|
||||
#include <stdarg.h>
|
||||
#include <stdio.h>
|
||||
#include <getopt.h>
|
||||
#include <err.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
#include <netinet/tcp.h>
|
||||
#include <arpa/inet.h>
|
||||
|
||||
int verbose;
|
||||
|
||||
static void usage(const char *name)
|
||||
{
|
||||
printf(
|
||||
"Usage: %s [OPTIONS] FILE\n"
|
||||
"QEMU Disk Network Block Device Server\n"
|
||||
"\n"
|
||||
" -p, --port=PORT port to listen on (default `1024')\n"
|
||||
" -o, --offset=OFFSET offset into the image\n"
|
||||
" -b, --bind=IFACE interface to bind to (default `0.0.0.0')\n"
|
||||
" -r, --read-only export read-only\n"
|
||||
" -P, --partition=NUM only expose partition NUM\n"
|
||||
" -v, --verbose display extra debugging information\n"
|
||||
" -h, --help display this help and exit\n"
|
||||
" -V, --version output version information and exit\n"
|
||||
"\n"
|
||||
"Report bugs to <anthony@codemonkey.ws>\n"
|
||||
, name);
|
||||
}
|
||||
|
||||
static void version(const char *name)
|
||||
{
|
||||
printf(
|
||||
"qemu-nbd version 0.0.1\n"
|
||||
"Written by Anthony Liguori.\n"
|
||||
"\n"
|
||||
"Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.\n"
|
||||
"This is free software; see the source for copying conditions. There is NO\n"
|
||||
"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
|
||||
);
|
||||
}
|
||||
|
||||
struct partition_record
|
||||
{
|
||||
uint8_t bootable;
|
||||
uint8_t start_head;
|
||||
uint32_t start_cylinder;
|
||||
uint8_t start_sector;
|
||||
uint8_t system;
|
||||
uint8_t end_head;
|
||||
uint8_t end_cylinder;
|
||||
uint8_t end_sector;
|
||||
uint32_t start_sector_abs;
|
||||
uint32_t nb_sectors_abs;
|
||||
};
|
||||
|
||||
static void read_partition(uint8_t *p, struct partition_record *r)
|
||||
{
|
||||
r->bootable = p[0];
|
||||
r->start_head = p[1];
|
||||
r->start_cylinder = p[3] | ((p[2] << 2) & 0x0300);
|
||||
r->start_sector = p[2] & 0x3f;
|
||||
r->system = p[4];
|
||||
r->end_head = p[5];
|
||||
r->end_cylinder = p[7] | ((p[6] << 2) & 0x300);
|
||||
r->end_sector = p[6] & 0x3f;
|
||||
r->start_sector_abs = p[8] | p[9] << 8 | p[10] << 16 | p[11] << 24;
|
||||
r->nb_sectors_abs = p[12] | p[13] << 8 | p[14] << 16 | p[15] << 24;
|
||||
}
|
||||
|
||||
static int find_partition(BlockDriverState *bs, int partition,
|
||||
off_t *offset, off_t *size)
|
||||
{
|
||||
struct partition_record mbr[4];
|
||||
uint8_t data[512];
|
||||
int i;
|
||||
int ext_partnum = 4;
|
||||
|
||||
if (bdrv_read(bs, 0, data, 1))
|
||||
errx(EINVAL, "error while reading");
|
||||
|
||||
if (data[510] != 0x55 || data[511] != 0xaa) {
|
||||
errno = -EINVAL;
|
||||
return -1;
|
||||
}
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
read_partition(&data[446 + 16 * i], &mbr[i]);
|
||||
|
||||
if (!mbr[i].nb_sectors_abs)
|
||||
continue;
|
||||
|
||||
if (mbr[i].system == 0xF || mbr[i].system == 0x5) {
|
||||
struct partition_record ext[4];
|
||||
uint8_t data1[512];
|
||||
int j;
|
||||
|
||||
if (bdrv_read(bs, mbr[i].start_sector_abs, data1, 1))
|
||||
errx(EINVAL, "error while reading");
|
||||
|
||||
for (j = 0; j < 4; j++) {
|
||||
read_partition(&data1[446 + 16 * j], &ext[j]);
|
||||
if (!ext[j].nb_sectors_abs)
|
||||
continue;
|
||||
|
||||
if ((ext_partnum + j + 1) == partition) {
|
||||
*offset = (uint64_t)ext[j].start_sector_abs << 9;
|
||||
*size = (uint64_t)ext[j].nb_sectors_abs << 9;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
ext_partnum += 4;
|
||||
} else if ((i + 1) == partition) {
|
||||
*offset = (uint64_t)mbr[i].start_sector_abs << 9;
|
||||
*size = (uint64_t)mbr[i].nb_sectors_abs << 9;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
errno = -ENOENT;
|
||||
return -1;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
BlockDriverState *bs;
|
||||
off_t dev_offset = 0;
|
||||
off_t offset = 0;
|
||||
bool readonly = false;
|
||||
const char *bindto = "0.0.0.0";
|
||||
int port = 1024;
|
||||
int sock, csock;
|
||||
struct sockaddr_in addr;
|
||||
socklen_t addr_len = sizeof(addr);
|
||||
off_t fd_size;
|
||||
const char *sopt = "hVbo:p:rsP:v";
|
||||
struct option lopt[] = {
|
||||
{ "help", 0, 0, 'h' },
|
||||
{ "version", 0, 0, 'V' },
|
||||
{ "bind", 1, 0, 'b' },
|
||||
{ "port", 1, 0, 'p' },
|
||||
{ "offset", 1, 0, 'o' },
|
||||
{ "read-only", 0, 0, 'r' },
|
||||
{ "partition", 1, 0, 'P' },
|
||||
{ "snapshot", 0, 0, 's' },
|
||||
{ "verbose", 0, 0, 'v' },
|
||||
};
|
||||
int ch;
|
||||
int opt_ind = 0;
|
||||
int li;
|
||||
char *end;
|
||||
bool snapshot = false;
|
||||
int partition = -1;
|
||||
|
||||
while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
|
||||
switch (ch) {
|
||||
case 's':
|
||||
snapshot = true;
|
||||
break;
|
||||
case 'b':
|
||||
bindto = optarg;
|
||||
break;
|
||||
case 'p':
|
||||
li = strtol(optarg, &end, 0);
|
||||
if (*end) {
|
||||
errx(EINVAL, "Invalid port `%s'", optarg);
|
||||
}
|
||||
if (li < 1 || li > 65535) {
|
||||
errx(EINVAL, "Port out of range `%s'", optarg);
|
||||
}
|
||||
port = (uint16_t)li;
|
||||
break;
|
||||
case 'o':
|
||||
dev_offset = strtoll (optarg, &end, 0);
|
||||
if (*end) {
|
||||
errx(EINVAL, "Invalid offset `%s'", optarg);
|
||||
}
|
||||
if (dev_offset < 0) {
|
||||
errx(EINVAL, "Offset must be positive `%s'", optarg);
|
||||
}
|
||||
break;
|
||||
case 'r':
|
||||
readonly = true;
|
||||
break;
|
||||
case 'P':
|
||||
partition = strtol(optarg, &end, 0);
|
||||
if (*end)
|
||||
errx(EINVAL, "Invalid partition `%s'", optarg);
|
||||
if (partition < 1 || partition > 8)
|
||||
errx(EINVAL, "Invalid partition %d", partition);
|
||||
break;
|
||||
case 'v':
|
||||
verbose = 1;
|
||||
break;
|
||||
case 'V':
|
||||
version(argv[0]);
|
||||
exit(0);
|
||||
break;
|
||||
case 'h':
|
||||
usage(argv[0]);
|
||||
exit(0);
|
||||
break;
|
||||
case '?':
|
||||
errx(EINVAL, "Try `%s --help' for more information.",
|
||||
argv[0]);
|
||||
}
|
||||
}
|
||||
|
||||
if ((argc - optind) != 1) {
|
||||
errx(EINVAL, "Invalid number of argument.\n"
|
||||
"Try `%s --help' for more information.",
|
||||
argv[0]);
|
||||
}
|
||||
|
||||
bdrv_init();
|
||||
|
||||
bs = bdrv_new("hda");
|
||||
if (bs == NULL)
|
||||
return 1;
|
||||
|
||||
if (bdrv_open(bs, argv[optind], snapshot) == -1)
|
||||
return 1;
|
||||
|
||||
fd_size = bs->total_sectors * 512;
|
||||
|
||||
if (partition != -1 &&
|
||||
find_partition(bs, partition, &dev_offset, &fd_size))
|
||||
errx(errno, "Could not find partition %d", partition);
|
||||
|
||||
sock = tcp_socket_incoming(bindto, port);
|
||||
if (sock == -1)
|
||||
return 1;
|
||||
|
||||
csock = accept(sock,
|
||||
(struct sockaddr *)&addr,
|
||||
&addr_len);
|
||||
if (csock == -1)
|
||||
return 1;
|
||||
|
||||
/* new fd_size is calculated by find_partition */
|
||||
if (nbd_negotiate(bs, csock, fd_size) == -1)
|
||||
return 1;
|
||||
|
||||
while (nbd_trip(bs, csock, fd_size, dev_offset, &offset, readonly) == 0);
|
||||
|
||||
close(csock);
|
||||
close(sock);
|
||||
bdrv_close(bs);
|
||||
|
||||
return 0;
|
||||
}
|
52
qemu-nbd.texi
Normal file
52
qemu-nbd.texi
Normal file
|
@ -0,0 +1,52 @@
|
|||
@example
|
||||
@c man begin SYNOPSIS
|
||||
usage: qemu-nbd [OPTION]... @var{filename}
|
||||
@c man end
|
||||
@end example
|
||||
|
||||
@c man begin DESCRIPTION
|
||||
|
||||
Export Qemu disk image using NBD protocol.
|
||||
|
||||
@c man end
|
||||
|
||||
@c man begin OPTIONS
|
||||
@table @var
|
||||
@item filename
|
||||
is a disk image filename
|
||||
@item -p, --port=PORT
|
||||
port to listen on (default `1024')
|
||||
@item -o, --offset=OFFSET
|
||||
offset into the image
|
||||
@item -b, --bind=IFACE
|
||||
interface to bind to (default `0.0.0.0')
|
||||
@item -r, --read-only
|
||||
export read-only
|
||||
@item -P, --partition=NUM
|
||||
only expose partition NUM
|
||||
@item -v, --verbose
|
||||
display extra debugging information
|
||||
@item -h, --help
|
||||
display this help and exit
|
||||
@item -V, --version
|
||||
output version information and exit
|
||||
@end table
|
||||
|
||||
@c man end
|
||||
|
||||
@ignore
|
||||
|
||||
@setfilename qemu-nbd
|
||||
@settitle QEMU Disk Network Block Device Server
|
||||
|
||||
@c man begin AUTHOR
|
||||
Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>.
|
||||
This is free software; see the source for copying conditions. There is NO
|
||||
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
||||
@c man end
|
||||
|
||||
@c man begin SEEALSO
|
||||
qemu-img(1)
|
||||
@c man end
|
||||
|
||||
@end ignore
|
Loading…
Reference in a new issue