662 lines
14 KiB
C
662 lines
14 KiB
C
/*
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "nbd.h"
|
|
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#ifndef _WIN32
|
|
#include <sys/ioctl.h>
|
|
#endif
|
|
#ifdef __sun__
|
|
#include <sys/ioccom.h>
|
|
#endif
|
|
#include <ctype.h>
|
|
#include <inttypes.h>
|
|
|
|
#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)
|
|
|
|
/* 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) nbd_wr_sync(fd, buffer, size, true)
|
|
#define write_sync(fd, buffer, size) nbd_wr_sync(fd, buffer, size, false)
|
|
|
|
size_t nbd_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 = recv(fd, buffer + offset, size - offset, 0);
|
|
} else {
|
|
len = send(fd, buffer + offset, size - offset, 0);
|
|
}
|
|
|
|
if (len == -1)
|
|
errno = socket_error();
|
|
|
|
/* recoverable error */
|
|
if (len == -1 && (errno == EAGAIN || errno == EINTR)) {
|
|
continue;
|
|
}
|
|
|
|
/* eof */
|
|
if (len == 0) {
|
|
break;
|
|
}
|
|
|
|
/* unrecoverable error */
|
|
if (len == -1) {
|
|
return 0;
|
|
}
|
|
|
|
offset += len;
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
|
|
int tcp_socket_outgoing(const char *address, uint16_t port)
|
|
{
|
|
int s;
|
|
struct in_addr in;
|
|
struct sockaddr_in addr;
|
|
|
|
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:
|
|
closesocket(s);
|
|
return -1;
|
|
}
|
|
|
|
int tcp_socket_incoming(const char *address, uint16_t port)
|
|
{
|
|
int s;
|
|
struct in_addr in;
|
|
struct sockaddr_in addr;
|
|
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:
|
|
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
|
|
|
|
Negotiate
|
|
Request
|
|
Response
|
|
Request
|
|
Response
|
|
...
|
|
...
|
|
Request (type == 2)
|
|
*/
|
|
|
|
int nbd_negotiate(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 csock, off_t *size, size_t *blocksize)
|
|
{
|
|
char buf[8 + 8 + 8 + 128];
|
|
uint64_t magic;
|
|
|
|
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",
|
|
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] : '.');
|
|
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;
|
|
}
|
|
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) {
|
|
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;
|
|
}
|
|
#else
|
|
int nbd_init(int fd, int csock, off_t size, size_t blocksize)
|
|
{
|
|
errno = ENOTSUP;
|
|
return -1;
|
|
}
|
|
|
|
int nbd_disconnect(int fd)
|
|
{
|
|
errno = ENOTSUP;
|
|
return -1;
|
|
}
|
|
|
|
int nbd_client(int fd, int csock)
|
|
{
|
|
errno = ENOTSUP;
|
|
return -1;
|
|
}
|
|
#endif
|
|
|
|
int nbd_send_request(int csock, struct nbd_request *request)
|
|
{
|
|
uint8_t buf[4 + 4 + 8 + 8 + 4];
|
|
|
|
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");
|
|
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);
|
|
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, 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[4 + 4 + 8];
|
|
uint32_t magic;
|
|
|
|
memset(buf, 0xAA, sizeof(buf));
|
|
|
|
if (read_sync(csock, buf, sizeof(buf)) != sizeof(buf)) {
|
|
LOG("read failed");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
/* 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 > data_size) {
|
|
LOG("len (%u) is larger than max len (%u)",
|
|
request.len, 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 ((request.from + request.len) > size) {
|
|
LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
|
|
", Offset: %" PRIu64 "\n",
|
|
request.from, request.len, size, dev_offset);
|
|
LOG("requested operation past EOF--bad client?");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
TRACE("Decoding type");
|
|
|
|
reply.handle = request.handle;
|
|
reply.error = 0;
|
|
|
|
switch (request.type) {
|
|
case NBD_CMD_READ:
|
|
TRACE("Request type is READ");
|
|
|
|
if (bdrv_read(bs, (request.from + dev_offset) / 512, data,
|
|
request.len / 512) == -1) {
|
|
LOG("reading from file failed");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
*offset += request.len;
|
|
|
|
TRACE("Read %u byte(s)", request.len);
|
|
|
|
if (nbd_send_reply(csock, &reply) == -1)
|
|
return -1;
|
|
|
|
TRACE("Sending data to client");
|
|
|
|
if (write_sync(csock, data, request.len) != request.len) {
|
|
LOG("writing to socket failed");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
break;
|
|
case NBD_CMD_WRITE:
|
|
TRACE("Request type is WRITE");
|
|
|
|
TRACE("Reading %u byte(s)", request.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");
|
|
reply.error = 1;
|
|
} else {
|
|
TRACE("Writing to device");
|
|
|
|
if (bdrv_write(bs, (request.from + dev_offset) / 512,
|
|
data, request.len / 512) == -1) {
|
|
LOG("writing to file failed");
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
*offset += request.len;
|
|
}
|
|
|
|
if (nbd_send_reply(csock, &reply) == -1)
|
|
return -1;
|
|
break;
|
|
case NBD_CMD_DISC:
|
|
TRACE("Request type is DISCONNECT");
|
|
errno = 0;
|
|
return 1;
|
|
default:
|
|
LOG("invalid request type (%u) received", request.type);
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
TRACE("Request/Reply complete");
|
|
|
|
return 0;
|
|
}
|