-/*\
+/*
* Copyright (C) 2005 Anthony Liguori <anthony@codemonkey.ws>
*
* Network Block Device
* 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
-\*/
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
#include "nbd.h"
#include <errno.h>
#include <string.h>
+#ifndef _WIN32
#include <sys/ioctl.h>
+#endif
+#if defined(__sun__) || defined(__HAIKU__)
+#include <sys/ioccom.h>
+#endif
#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;
+#include "qemu_socket.h"
+
+//#define DEBUG_NBD
+
+#ifdef DEBUG_NBD
+#define TRACE(msg, ...) do { \
+ LOG(msg, ## __VA_ARGS__); \
+} while(0)
+#else
+#define TRACE(msg, ...) \
+ do { } while (0)
+#endif
#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_REPLY_SIZE (4 + 4 + 8)
#define NBD_REQUEST_MAGIC 0x25609513
#define NBD_REPLY_MAGIC 0x67446698
#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
#define NBD_DISCONNECT _IO(0xab, 8)
+#define NBD_OPT_EXPORT_NAME (1 << 0)
+
/* 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)
+#define read_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, true)
+#define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false)
-static size_t wr_sync(int fd, void *buffer, size_t size, bool do_read)
+size_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read)
{
size_t offset = 0;
ssize_t len;
if (do_read) {
- len = read(fd, buffer + offset, size - offset);
+ len = recv(fd, buffer + offset, size - offset, 0);
} else {
- len = write(fd, buffer + offset, size - offset);
+ len = send(fd, buffer + offset, size - offset, 0);
}
+ if (len == -1)
+ errno = socket_error();
+
/* recoverable error */
- if (len == -1 && errno == EAGAIN) {
+ if (len == -1 && (errno == EAGAIN || errno == EINTR)) {
continue;
}
return offset;
}
-static int tcp_socket_outgoing(const char *address, uint16_t port)
+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 s;
error:
- serrno = errno;
- close(s);
- errno = serrno;
+ closesocket(s);
return -1;
}
int s;
struct in_addr in;
struct sockaddr_in addr;
- int serrno;
int opt;
s = socket(PF_INET, SOCK_STREAM, 0);
memcpy(&addr.sin_addr.s_addr, &in, sizeof(in));
opt = 1;
- if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) == -1) {
+ if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
+ (const void *) &opt, sizeof(opt)) == -1) {
goto error;
}
return s;
error:
- serrno = errno;
- close(s);
- errno = serrno;
+ closesocket(s);
+ return -1;
+}
+
+#ifndef _WIN32
+int unix_socket_incoming(const char *path)
+{
+ int s;
+ struct sockaddr_un addr;
+
+ s = socket(PF_UNIX, SOCK_STREAM, 0);
+ if (s == -1) {
+ return -1;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
+
+ if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ goto error;
+ }
+
+ if (listen(s, 128) == -1) {
+ goto error;
+ }
+
+ return s;
+error:
+ closesocket(s);
+ return -1;
+}
+
+int unix_socket_outgoing(const char *path)
+{
+ int s;
+ struct sockaddr_un addr;
+
+ s = socket(PF_UNIX, SOCK_STREAM, 0);
+ if (s == -1) {
+ return -1;
+ }
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ pstrcpy(addr.sun_path, sizeof(addr.sun_path), path);
+
+ if (connect(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ goto error;
+ }
+
+ return s;
+error:
+ closesocket(s);
+ return -1;
+}
+#else
+int unix_socket_incoming(const char *path)
+{
+ errno = ENOTSUP;
return -1;
}
+int unix_socket_outgoing(const char *path)
+{
+ errno = ENOTSUP;
+ return -1;
+}
+#endif
+
+
/* Basic flow
Server Client
Request (type == 2)
*/
-int nbd_negotiate(BlockDriverState *bs, int csock, off_t size)
+int nbd_negotiate(int csock, off_t size)
{
char buf[8 + 8 + 8 + 128];
return 0;
}
-int nbd_receive_negotiate(int fd, int csock)
+int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
+ off_t *size, size_t *blocksize)
{
- char buf[8 + 8 + 8 + 128];
- uint64_t magic;
- off_t size;
- size_t blocksize;
+ char buf[256];
+ uint64_t magic, s;
+ uint16_t tmp;
TRACE("Receiving negotation.");
- if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
+ if (read_sync(csock, buf, 8) != 8) {
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;
+ buf[8] = '\0';
+ if (strlen(buf) == 0) {
+ LOG("server connection closed");
+ errno = EINVAL;
+ return -1;
+ }
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);
+ qemu_isprint(buf[0]) ? buf[0] : '.',
+ qemu_isprint(buf[1]) ? buf[1] : '.',
+ qemu_isprint(buf[2]) ? buf[2] : '.',
+ qemu_isprint(buf[3]) ? buf[3] : '.',
+ qemu_isprint(buf[4]) ? buf[4] : '.',
+ qemu_isprint(buf[5]) ? buf[5] : '.',
+ qemu_isprint(buf[6]) ? buf[6] : '.',
+ qemu_isprint(buf[7]) ? buf[7] : '.');
if (memcmp(buf, "NBDMAGIC", 8) != 0) {
LOG("Invalid magic received");
return -1;
}
- TRACE("Checking magic");
+ if (read_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ LOG("read failed");
+ errno = EINVAL;
+ return -1;
+ }
+ magic = be64_to_cpu(magic);
+ TRACE("Magic is 0x%" PRIx64, magic);
+
+ if (name) {
+ uint32_t reserved = 0;
+ uint32_t opt;
+ uint32_t namesize;
- if (magic != 0x00420281861253LL) {
- LOG("Bad magic received");
+ TRACE("Checking magic (opts_magic)");
+ if (magic != 0x49484156454F5054LL) {
+ LOG("Bad magic received");
+ errno = EINVAL;
+ return -1;
+ }
+ if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+ LOG("flags read failed");
+ errno = EINVAL;
+ return -1;
+ }
+ *flags = be16_to_cpu(tmp) << 16;
+ /* reserved for future use */
+ if (write_sync(csock, &reserved, sizeof(reserved)) !=
+ sizeof(reserved)) {
+ LOG("write failed (reserved)");
+ errno = EINVAL;
+ return -1;
+ }
+ /* write the export name */
+ magic = cpu_to_be64(magic);
+ if (write_sync(csock, &magic, sizeof(magic)) != sizeof(magic)) {
+ LOG("write failed (magic)");
+ errno = EINVAL;
+ return -1;
+ }
+ opt = cpu_to_be32(NBD_OPT_EXPORT_NAME);
+ if (write_sync(csock, &opt, sizeof(opt)) != sizeof(opt)) {
+ LOG("write failed (opt)");
+ errno = EINVAL;
+ return -1;
+ }
+ namesize = cpu_to_be32(strlen(name));
+ if (write_sync(csock, &namesize, sizeof(namesize)) !=
+ sizeof(namesize)) {
+ LOG("write failed (namesize)");
+ errno = EINVAL;
+ return -1;
+ }
+ if (write_sync(csock, (char*)name, strlen(name)) != strlen(name)) {
+ LOG("write failed (name)");
+ errno = EINVAL;
+ return -1;
+ }
+ } else {
+ TRACE("Checking magic (cli_magic)");
+
+ if (magic != 0x00420281861253LL) {
+ LOG("Bad magic received");
+ errno = EINVAL;
+ return -1;
+ }
+ }
+
+ if (read_sync(csock, &s, sizeof(s)) != sizeof(s)) {
+ LOG("read failed");
errno = EINVAL;
return -1;
}
+ *size = be64_to_cpu(s);
+ *blocksize = 1024;
+ TRACE("Size is %" PRIu64, *size);
+ if (!name) {
+ if (read_sync(csock, flags, sizeof(*flags)) != sizeof(*flags)) {
+ LOG("read failed (flags)");
+ errno = EINVAL;
+ return -1;
+ }
+ *flags = be32_to_cpup(flags);
+ } else {
+ if (read_sync(csock, &tmp, sizeof(tmp)) != sizeof(tmp)) {
+ LOG("read failed (tmp)");
+ errno = EINVAL;
+ return -1;
+ }
+ *flags |= be32_to_cpu(tmp);
+ }
+ if (read_sync(csock, &buf, 124) != 124) {
+ LOG("read failed (buf)");
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+}
+
+#ifndef _WIN32
+int nbd_init(int fd, int csock, off_t size, size_t blocksize)
+{
TRACE("Setting block size to %lu", (unsigned long)blocksize);
if (ioctl(fd, NBD_SET_BLKSIZE, blocksize) == -1) {
return -1;
}
- TRACE("Setting size to %llu block(s)",
- (unsigned long long)(size / blocksize));
+ TRACE("Setting size to %zd block(s)", (size_t)(size / blocksize));
if (ioctl(fd, NBD_SET_SIZE_BLOCKS, size / blocksize) == -1) {
int serrno = errno;
return 0;
}
-int nbd_client(int fd, int csock)
+int nbd_client(int fd)
{
int ret;
int serrno;
errno = serrno;
return ret;
}
+#else
+int nbd_init(int fd, int csock, off_t size, size_t blocksize)
+{
+ errno = ENOTSUP;
+ return -1;
+}
-int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset, off_t *offset, bool readonly)
+int nbd_disconnect(int fd)
{
-#ifndef _REENTRANT
- static uint8_t data[1024 * 1024]; // keep this off of the stack
-#else
- uint8_t data[1024 * 1024];
+ errno = ENOTSUP;
+ return -1;
+}
+
+int nbd_client(int fd)
+{
+ errno = ENOTSUP;
+ return -1;
+}
#endif
+
+int nbd_send_request(int csock, struct nbd_request *request)
+{
uint8_t buf[4 + 4 + 8 + 8 + 4];
- uint32_t magic;
- uint32_t type;
- uint64_t from;
- uint32_t len;
- TRACE("Reading request.");
+ cpu_to_be32w((uint32_t*)buf, NBD_REQUEST_MAGIC);
+ cpu_to_be32w((uint32_t*)(buf + 4), request->type);
+ cpu_to_be64w((uint64_t*)(buf + 8), request->handle);
+ cpu_to_be64w((uint64_t*)(buf + 16), request->from);
+ cpu_to_be32w((uint32_t*)(buf + 24), request->len);
+
+ TRACE("Sending request to client");
+
+ if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
+ LOG("writing to socket failed");
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+}
+
+
+static int nbd_receive_request(int csock, struct nbd_request *request)
+{
+ uint8_t buf[4 + 4 + 8 + 8 + 4];
+ uint32_t magic;
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
LOG("read failed");
}
/* Request
- [ 0 .. 3] magic (NBD_REQUEST_MAGIC)
- [ 4 .. 7] type (0 == READ, 1 == WRITE)
- [ 8 .. 15] handle
- [16 .. 23] from
- [24 .. 27] len
+ [ 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));
+ request->type = be32_to_cpup((uint32_t*)(buf + 4));
+ request->handle = be64_to_cpup((uint64_t*)(buf + 8));
+ request->from = be64_to_cpup((uint64_t*)(buf + 16));
+ request->len = be32_to_cpup((uint32_t*)(buf + 24));
TRACE("Got request: "
"{ magic = 0x%x, .type = %d, from = %" PRIu64" , len = %u }",
- magic, type, from, len);
-
+ magic, request->type, request->from, request->len);
if (magic != NBD_REQUEST_MAGIC) {
LOG("invalid magic (got 0x%x)", magic);
errno = EINVAL;
return -1;
}
+ return 0;
+}
+
+int nbd_receive_reply(int csock, struct nbd_reply *reply)
+{
+ uint8_t buf[NBD_REPLY_SIZE];
+ uint32_t magic;
+
+ memset(buf, 0xAA, sizeof(buf));
- if (len > sizeof(data)) {
- LOG("len (%u) is larger than max len (%lu)",
- len, (unsigned long)sizeof(data));
+ if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
+ LOG("read failed");
errno = EINVAL;
return -1;
}
- if ((from + len) < from) {
+ /* Reply
+ [ 0 .. 3] magic (NBD_REPLY_MAGIC)
+ [ 4 .. 7] error (0 == no error)
+ [ 7 .. 15] handle
+ */
+
+ magic = be32_to_cpup((uint32_t*)buf);
+ reply->error = be32_to_cpup((uint32_t*)(buf + 4));
+ reply->handle = be64_to_cpup((uint64_t*)(buf + 8));
+
+ TRACE("Got reply: "
+ "{ magic = 0x%x, .error = %d, handle = %" PRIu64" }",
+ magic, reply->error, reply->handle);
+
+ if (magic != NBD_REPLY_MAGIC) {
+ LOG("invalid magic (got 0x%x)", magic);
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+}
+
+static int nbd_send_reply(int csock, struct nbd_reply *reply)
+{
+ uint8_t buf[4 + 4 + 8];
+
+ /* 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), reply->error);
+ cpu_to_be64w((uint64_t*)(buf + 8), reply->handle);
+
+ TRACE("Sending response to client");
+
+ if (write_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
+ LOG("writing to socket failed");
+ errno = EINVAL;
+ return -1;
+ }
+ return 0;
+}
+
+int nbd_trip(BlockDriverState *bs, int csock, off_t size, uint64_t dev_offset,
+ off_t *offset, bool readonly, uint8_t *data, int data_size)
+{
+ struct nbd_request request;
+ struct nbd_reply reply;
+
+ TRACE("Reading request.");
+
+ if (nbd_receive_request(csock, &request) == -1)
+ return -1;
+
+ if (request.len + NBD_REPLY_SIZE > data_size) {
+ LOG("len (%u) is larger than max len (%u)",
+ request.len + NBD_REPLY_SIZE, data_size);
+ errno = EINVAL;
+ return -1;
+ }
+
+ if ((request.from + request.len) < request.from) {
LOG("integer overflow detected! "
"you're probably being attacked");
errno = EINVAL;
return -1;
}
- if ((from + len) > size) {
+ if ((request.from + request.len) > size) {
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
", Offset: %" PRIu64 "\n",
- from, len, size, dev_offset);
+ request.from, request.len, (uint64_t)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:
+ reply.handle = request.handle;
+ reply.error = 0;
+
+ switch (request.type) {
+ case NBD_CMD_READ:
TRACE("Request type is READ");
- if (bdrv_read(bs, (from + dev_offset) / 512, data, len / 512) == -1) {
+ if (bdrv_read(bs, (request.from + dev_offset) / 512,
+ data + NBD_REPLY_SIZE,
+ request.len / 512) == -1) {
LOG("reading from file failed");
errno = EINVAL;
return -1;
}
- *offset += len;
+ *offset += request.len;
- TRACE("Read %u byte(s)", len);
+ TRACE("Read %u byte(s)", request.len);
- TRACE("Sending OK response");
+ /* Reply
+ [ 0 .. 3] magic (NBD_REPLY_MAGIC)
+ [ 4 .. 7] error (0 == no error)
+ [ 7 .. 15] handle
+ */
- if (write_sync(csock, buf, 16) != 16) {
- LOG("writing to socket failed");
- errno = EINVAL;
- return -1;
- }
+ cpu_to_be32w((uint32_t*)data, NBD_REPLY_MAGIC);
+ cpu_to_be32w((uint32_t*)(data + 4), reply.error);
+ cpu_to_be64w((uint64_t*)(data + 8), reply.handle);
TRACE("Sending data to client");
- if (write_sync(csock, data, len) != len) {
+ if (write_sync(csock, data,
+ request.len + NBD_REPLY_SIZE) !=
+ request.len + NBD_REPLY_SIZE) {
LOG("writing to socket failed");
errno = EINVAL;
return -1;
}
break;
- case 1:
+ case NBD_CMD_WRITE:
TRACE("Request type is WRITE");
- TRACE("Reading %u byte(s)", len);
+ TRACE("Reading %u byte(s)", request.len);
- if (read_sync(csock, data, len) != len) {
+ if (read_sync(csock, data, request.len) != request.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);
+ reply.error = 1;
} else {
TRACE("Writing to device");
- if (bdrv_write(bs, (from + dev_offset) / 512, data, len / 512) == -1) {
+ if (bdrv_write(bs, (request.from + dev_offset) / 512,
+ data, request.len / 512) == -1) {
LOG("writing to file failed");
errno = EINVAL;
return -1;
}
- *offset += len;
+ *offset += request.len;
}
- TRACE("Sending response to client");
-
- if (write_sync(csock, buf, 16) != 16) {
- LOG("writing to socket failed");
- errno = EINVAL;
+ if (nbd_send_reply(csock, &reply) == -1)
return -1;
- }
break;
- case 2:
+ case NBD_CMD_DISC:
TRACE("Request type is DISCONNECT");
errno = 0;
return 1;
default:
- LOG("invalid request type (%u) received", type);
+ LOG("invalid request type (%u) received", request.type);
errno = EINVAL;
return -1;
}
projects / qemu.git / blobdiff