diff options
| -rw-r--r-- | Makefile | 14 | ||||
| -rwxr-xr-x | configure | 3 | ||||
| -rw-r--r-- | exec-all.h | 2 | ||||
| -rw-r--r-- | nbd.c | 500 | ||||
| -rw-r--r-- | nbd.h | 37 | ||||
| -rw-r--r-- | qemu-nbd.c | 275 | ||||
| -rw-r--r-- | qemu-nbd.texi | 52 |
7 files changed, 881 insertions, 2 deletions
@@ -17,7 +17,7 @@ ifdef CONFIG_STATIC LDFLAGS += -static endif ifdef BUILD_DOCS -DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1 +DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1 qemu-nbd.8 else DOCS= endif @@ -159,6 +159,10 @@ qemu-img-%.o: %.c %.o: %.c $(CC) $(CFLAGS) $(CPPFLAGS) -c -o $@ $< +qemu-nbd$(EXESUF): qemu-nbd.o nbd.o qemu-img-block.o \ + $(QEMU_IMG_BLOCK_OBJS) + $(CC) $(LDFLAGS) -o $@ $^ -lz $(LIBS) + # dyngen host tool dyngen$(EXESUF): dyngen.c $(HOST_CC) $(CFLAGS) $(CPPFLAGS) -o $@ $^ @@ -191,6 +195,8 @@ install-doc: $(DOCS) ifndef CONFIG_WIN32 mkdir -p "$(DESTDIR)$(mandir)/man1" $(INSTALL) qemu.1 qemu-img.1 "$(DESTDIR)$(mandir)/man1" + mkdir -p "$(DESTDIR)$(mandir)/man8" + $(INSTALL) qemu-nbd.8 "$(DESTDIR)$(mandir)/man8" endif install: all $(if $(BUILD_DOCS),install-doc) @@ -244,6 +250,10 @@ qemu-img.1: qemu-img.texi $(SRC_PATH)/texi2pod.pl $< qemu-img.pod pod2man --section=1 --center=" " --release=" " qemu-img.pod > $@ +qemu-nbd.8: qemu-nbd.texi + $(SRC_PATH)/texi2pod.pl $< qemu-nbd.pod + pod2man --section=8 --center=" " --release=" " qemu-nbd.pod > $@ + info: qemu-doc.info qemu-tech.info dvi: qemu-doc.dvi qemu-tech.dvi @@ -296,6 +306,7 @@ tarbin: $(bindir)/qemu-sh4eb \ $(bindir)/qemu-cris \ $(bindir)/qemu-img \ + $(bindir)/qemu-nbd \ $(datadir)/bios.bin \ $(datadir)/vgabios.bin \ $(datadir)/vgabios-cirrus.bin \ @@ -309,6 +320,7 @@ tarbin: $(docdir)/qemu-doc.html \ $(docdir)/qemu-tech.html \ $(mandir)/man1/qemu.1 $(mandir)/man1/qemu-img.1 + $(mandir)/man8/qemu-nbd.8 # Include automatically generated dependency files -include $(wildcard *.d audio/*.d slirp/*.d) @@ -1105,6 +1105,9 @@ echo "#define CONFIG_UNAME_RELEASE \"$uname_release\"" >> $config_h tools= if test `expr "$target_list" : ".*softmmu.*"` != 0 ; then tools="qemu-img\$(EXESUF) $tools" + if [ "$linux" = "yes" ] ; then + tools="qemu-nbd\$(EXESUF) $tools" + fi fi echo "TOOLS=$tools" >> $config_mak @@ -126,7 +126,7 @@ static inline int tlb_set_page(CPUState *env1, target_ulong vaddr, #define CODE_GEN_BUFFER_SIZE (6 * 1024 * 1024) #else /* XXX: make it dynamic on x86 */ -#define CODE_GEN_BUFFER_SIZE (16 * 1024 * 1024) +#define CODE_GEN_BUFFER_SIZE (64 * 1024 * 1024) #endif //#define CODE_GEN_BUFFER_SIZE (128 * 1024) @@ -0,0 +1,500 @@ +/*\ + * 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 "nbd.h" + +#include <errno.h> +#include <string.h> +#include <sys/ioctl.h> +#include <ctype.h> +#include <inttypes.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <netinet/tcp.h> +#include <arpa/inet.h> +#include <netdb.h> + +extern int verbose; + +#define LOG(msg, ...) do { \ + fprintf(stderr, "%s:%s():L%d: " msg "\n", \ + __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \ +} while(0) + +#define TRACE(msg, ...) do { \ + if (verbose) LOG(msg, ## __VA_ARGS__); \ +} while(0) + +/* This is all part of the "official" NBD API */ + +#define NBD_REQUEST_MAGIC 0x25609513 +#define NBD_REPLY_MAGIC 0x67446698 + +#define NBD_SET_SOCK _IO(0xab, 0) +#define NBD_SET_BLKSIZE _IO(0xab, 1) +#define NBD_SET_SIZE _IO(0xab, 2) +#define NBD_DO_IT _IO(0xab, 3) +#define NBD_CLEAR_SOCK _IO(0xab, 4) +#define NBD_CLEAR_QUE _IO(0xab, 5) +#define NBD_PRINT_DEBUG _IO(0xab, 6) +#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) +#define NBD_DISCONNECT _IO(0xab, 8) + +/* That's all folks */ + +#define read_sync(fd, buffer, size) wr_sync(fd, buffer, size, true) +#define write_sync(fd, buffer, size) wr_sync(fd, buffer, size, false) + +static size_t wr_sync(int fd, void *buffer, size_t size, bool do_read) +{ + size_t offset = 0; + + while (offset < size) { + ssize_t len; + + if (do_read) { + len = read(fd, buffer + offset, size - offset); + } else { + len = write(fd, buffer + offset, size - offset); + } + + /* recoverable error */ + if (len == -1 && errno == EAGAIN) { + continue; + } + + /* eof */ + if (len == 0) { + break; + } + + /* unrecoverable error */ + if (len == -1) { + return 0; + } + + offset += len; + } + + return offset; +} + +static int tcp_socket_outgoing(const char *address, uint16_t port) +{ + int s; + struct in_addr in; + struct sockaddr_in addr; + int serrno; + + s = socket(PF_INET, SOCK_STREAM, 0); + if (s == -1) { + return -1; + } + + if (inet_aton(address, &in) == 0) { + struct hostent *ent; + + ent = gethostbyname(address); + if (ent == NULL) { + goto error; + } + + memcpy(&in, ent->h_addr, sizeof(in)); + } + + addr.sin_family = AF_INET; + addr.sin_port = htons(port); + memcpy(&addr.sin_addr.s_addr, &in, sizeof(in)); + + if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { + goto error; + } + + return s; +error: + serrno = errno; + close(s); + errno = serrno; + return -1; +} + +int tcp_socket_incoming(const char *address, uint16_t port) +{ + int s; + struct in_addr in; + struct sockaddr_in addr; + int serrno; + int opt; + + s = socket(PF_INET, SOCK_STREAM, 0); + if (s == -1) { + return -1; + } + + if (inet_aton(address, &in) == 0) { + struct hostent *ent; + + ent = gethostbyname(address); + if (ent == NULL) { + goto error; + } + + memcpy(&in, ent->h_addr, sizeof(in)); + } + + addr.sin_family = AF_INET; + addr.sin_port = htons(port); + memcpy(&addr.sin_addr.s_addr, &in, sizeof(in)); + + opt = 1; + if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1) { + goto error; + } + + if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) { + goto error; + } + + if (listen(s, 128) == -1) { + goto error; + } + + return s; +error: + serrno = errno; + close(s); + errno = serrno; + return -1; +} + +/* Basic flow + + Server Client + + Negotiate + Request + Response + Request + Response + ... + ... + Request (type == 2) +*/ + +int nbd_negotiate(BlockDriverState *bs, int csock, off_t size) +{ + char buf[8 + 8 + 8 + 128]; + + /* Negotiate + [ 0 .. 7] passwd ("NBDMAGIC") + [ 8 .. 15] magic (0x00420281861253) + [16 .. 23] size + [24 .. 151] reserved (0) + */ + + TRACE("Beginning negotiation."); + memcpy(buf, "NBDMAGIC", 8); + cpu_to_be64w((uint64_t*)(buf + 8), 0x00420281861253LL); + cpu_to_be64w((uint64_t*)(buf + 16), size); + memset(buf + 24, 0, 128); + + if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { + LOG("write failed"); + errno = EINVAL; + return -1; + } + + TRACE("Negotation succeeded."); + + return 0; +} + +int nbd_receive_negotiate(int fd, int csock) +{ + char buf[8 + 8 + 8 + 128]; + uint64_t magic; + off_t size; + size_t blocksize; + + TRACE("Receiving negotation."); + + if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) { + LOG("read failed"); + errno = EINVAL; + return -1; + } + + magic = be64_to_cpup((uint64_t*)(buf + 8)); + size = be64_to_cpup((uint64_t*)(buf + 16)); + blocksize = 1024; + + TRACE("Magic is %c%c%c%c%c%c%c%c", + isprint(buf[0]) ? buf[0] : '.', + isprint(buf[1]) ? buf[1] : '.', + isprint(buf[2]) ? buf[2] : '.', + isprint(buf[3]) ? buf[3] : '.', + 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; +} @@ -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 diff --git a/qemu-nbd.c b/qemu-nbd.c new file mode 100644 index 0000000..3fb3d0c --- /dev/null +++ b/qemu-nbd.c @@ -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; +} diff --git a/qemu-nbd.texi b/qemu-nbd.texi new file mode 100644 index 0000000..7b6d0cb --- /dev/null +++ b/qemu-nbd.texi @@ -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 |