*/
#include "nbd.h"
+#include "block.h"
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <inttypes.h>
+#ifdef __linux__
+#include <linux/fs.h>
+#endif
+
#include "qemu_socket.h"
//#define DEBUG_NBD
/* This is all part of the "official" NBD API */
-#define NBD_REPLY_SIZE (4 + 4 + 8)
+#define NBD_REPLY_SIZE (4 + 4 + 8)
#define NBD_REQUEST_MAGIC 0x25609513
#define NBD_REPLY_MAGIC 0x67446698
#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_PRINT_DEBUG _IO(0xab, 6)
+#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
#define NBD_DISCONNECT _IO(0xab, 8)
+#define NBD_SET_TIMEOUT _IO(0xab, 9)
+#define NBD_SET_FLAGS _IO(0xab, 10)
-#define NBD_OPT_EXPORT_NAME (1 << 0)
+#define NBD_OPT_EXPORT_NAME (1 << 0)
/* That's all folks */
ssize_t len;
if (do_read) {
- len = recv(fd, buffer + offset, size - offset, 0);
+ len = qemu_recv(fd, buffer + offset, size - offset, 0);
} else {
len = send(fd, buffer + offset, size - offset, 0);
}
return offset;
}
-int tcp_socket_outgoing(const char *address, uint16_t port)
+static void combine_addr(char *buf, size_t len, 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));
+ /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
+ if (strstr(address, ":")) {
+ snprintf(buf, len, "[%s]:%u", address, port);
+ } else {
+ snprintf(buf, len, "%s:%u", address, port);
}
-
- 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 tcp_socket_outgoing(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,
- (const void *) &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;
+ char address_and_port[128];
+ combine_addr(address_and_port, 128, address, port);
+ return tcp_socket_outgoing_spec(address_and_port);
}
-#ifndef _WIN32
-int unix_socket_incoming(const char *path)
+int tcp_socket_outgoing_spec(const char *address_and_port)
{
- 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;
+ return inet_connect(address_and_port, SOCK_STREAM);
}
-int unix_socket_outgoing(const char *path)
+int tcp_socket_incoming(const char *address, uint16_t port)
{
- 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;
- }
+ char address_and_port[128];
+ combine_addr(address_and_port, 128, address, port);
+ return tcp_socket_incoming_spec(address_and_port);
+}
- return s;
-error:
- closesocket(s);
- return -1;
+int tcp_socket_incoming_spec(const char *address_and_port)
+{
+ char *ostr = NULL;
+ int olen = 0;
+ return inet_listen(address_and_port, ostr, olen, SOCK_STREAM, 0);
}
-#else
+
int unix_socket_incoming(const char *path)
{
- errno = ENOTSUP;
- return -1;
+ char *ostr = NULL;
+ int olen = 0;
+
+ return unix_listen(path, ostr, olen);
}
int unix_socket_outgoing(const char *path)
{
- errno = ENOTSUP;
- return -1;
+ return unix_connect(path);
}
-#endif
-
/* Basic flow
Request (type == 2)
*/
-int nbd_negotiate(int csock, off_t size)
+int nbd_negotiate(int csock, off_t size, uint32_t flags)
{
- 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;
+ char buf[8 + 8 + 8 + 128];
+
+ /* Negotiate
+ [ 0 .. 7] passwd ("NBDMAGIC")
+ [ 8 .. 15] magic (0x00420281861253)
+ [16 .. 23] size
+ [24 .. 27] flags
+ [28 .. 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);
+ cpu_to_be32w((uint32_t*)(buf + 24), flags | NBD_FLAG_HAS_FLAGS);
+ memset(buf + 28, 0, 124);
+
+ 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, const char *name, uint32_t *flags,
off_t *size, size_t *blocksize)
{
- char buf[256];
- uint64_t magic, s;
- uint16_t tmp;
-
- TRACE("Receiving negotation.");
-
- if (read_sync(csock, buf, 8) != 8) {
- LOG("read failed");
- errno = EINVAL;
- return -1;
- }
-
- 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",
- 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");
- errno = EINVAL;
- return -1;
- }
-
- 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;
-
- 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;
- }
+ char buf[256];
+ uint64_t magic, s;
+ uint16_t tmp;
+
+ TRACE("Receiving negotation.");
+
+ if (read_sync(csock, buf, 8) != 8) {
+ LOG("read failed");
+ errno = EINVAL;
+ return -1;
+ }
+
+ 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",
+ 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");
+ errno = EINVAL;
+ return -1;
+ }
+
+ 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;
+
+ 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)
+#ifdef __linux__
+int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
{
- TRACE("Setting block size to %lu", (unsigned long)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;
- }
+ 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 %zd block(s)", (size_t)(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;
- }
+ 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 (flags & NBD_FLAG_READ_ONLY) {
+ int read_only = 1;
+ TRACE("Setting readonly attribute");
- if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {
- int serrno = errno;
- LOG("Failed clearing NBD socket");
- errno = serrno;
- return -1;
- }
+ if (ioctl(fd, BLKROSET, (unsigned long) &read_only) < 0) {
+ int serrno = errno;
+ LOG("Failed setting read-only attribute");
+ errno = serrno;
+ return -1;
+ }
+ }
- TRACE("Setting NBD socket");
+ if (ioctl(fd, NBD_SET_FLAGS, flags) < 0
+ && errno != ENOTTY) {
+ int serrno = errno;
+ LOG("Failed setting flags");
+ errno = serrno;
+ return -1;
+ }
+
+ TRACE("Clearing NBD socket");
- if (ioctl(fd, NBD_SET_SOCK, csock) == -1) {
- int serrno = errno;
- LOG("Failed to set NBD socket");
- errno = serrno;
- return -1;
- }
+ if (ioctl(fd, NBD_CLEAR_SOCK) == -1) {
+ int serrno = errno;
+ LOG("Failed clearing NBD socket");
+ errno = serrno;
+ return -1;
+ }
- TRACE("Negotiation ended");
+ TRACE("Setting NBD socket");
- return 0;
+ 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;
+ ioctl(fd, NBD_CLEAR_QUE);
+ ioctl(fd, NBD_DISCONNECT);
+ ioctl(fd, NBD_CLEAR_SOCK);
+ return 0;
}
int nbd_client(int fd)
{
- int ret;
- int serrno;
-
- TRACE("Doing NBD loop");
-
- ret = ioctl(fd, NBD_DO_IT);
- serrno = errno;
+ int ret;
+ int serrno;
+
+ TRACE("Doing NBD loop");
+
+ ret = ioctl(fd, NBD_DO_IT);
+ if (ret == -1 && errno == EPIPE) {
+ /* NBD_DO_IT normally returns EPIPE when someone has disconnected
+ * the socket via NBD_DISCONNECT. We do not want to return 1 in
+ * that case.
+ */
+ ret = 0;
+ }
+ serrno = errno;
- TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
+ TRACE("NBD loop returned %d: %s", ret, strerror(serrno));
- TRACE("Clearing NBD queue");
- ioctl(fd, NBD_CLEAR_QUE);
+ TRACE("Clearing NBD queue");
+ ioctl(fd, NBD_CLEAR_QUE);
- TRACE("Clearing NBD socket");
- ioctl(fd, NBD_CLEAR_SOCK);
+ TRACE("Clearing NBD socket");
+ ioctl(fd, NBD_CLEAR_SOCK);
- errno = serrno;
- return ret;
+ errno = serrno;
+ return ret;
}
#else
-int nbd_init(int fd, int csock, off_t size, size_t blocksize)
+int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize)
{
errno = ENOTSUP;
return -1;
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;
-}
+ 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: "
+ "{ .from = %" PRIu64", .len = %u, .handle = %" PRIu64", .type=%i}",
+ request->from, request->len, request->handle, request->type);
+
+ 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;
+ 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[NBD_REPLY_SIZE];
- 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;
+ uint8_t buf[NBD_REPLY_SIZE];
+ 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;
+ 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)
+ off_t *offset, uint32_t nbdflags, 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 ((request.from + request.len) > size) {
- LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
- ", Offset: %" PRIu64 "\n",
+ 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 ((request.from + request.len) > size) {
+ LOG("From: %" PRIu64 ", Len: %u, Size: %" PRIu64
+ ", Offset: %" PRIu64 "\n",
request.from, request.len, (uint64_t)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 + NBD_REPLY_SIZE,
- request.len / 512) == -1) {
- LOG("reading from file failed");
- errno = EINVAL;
- return -1;
- }
- *offset += request.len;
-
- TRACE("Read %u byte(s)", request.len);
-
- /* Reply
- [ 0 .. 3] magic (NBD_REPLY_MAGIC)
- [ 4 .. 7] error (0 == no error)
- [ 7 .. 15] handle
- */
-
- 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,
- request.len + NBD_REPLY_SIZE) !=
- request.len + NBD_REPLY_SIZE) {
- 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;
+ 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 + NBD_REPLY_SIZE,
+ request.len / 512) == -1) {
+ LOG("reading from file failed");
+ errno = EINVAL;
+ return -1;
+ }
+ *offset += request.len;
+
+ TRACE("Read %u byte(s)", request.len);
+
+ /* Reply
+ [ 0 .. 3] magic (NBD_REPLY_MAGIC)
+ [ 4 .. 7] error (0 == no error)
+ [ 7 .. 15] handle
+ */
+
+ 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,
+ request.len + NBD_REPLY_SIZE) !=
+ request.len + NBD_REPLY_SIZE) {
+ 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 (nbdflags & NBD_FLAG_READ_ONLY) {
+ 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;
}
projects / qemu.git / blobdiff