s3:smbd: add infrastructure for SMB2 support
authorStefan Metzmacher <metze@samba.org>
Thu, 14 May 2009 12:17:28 +0000 (14:17 +0200)
committerStefan Metzmacher <metze@samba.org>
Wed, 20 May 2009 13:42:24 +0000 (15:42 +0200)
This is disabled by default and activated by
"max protocol = SMB2".

metze

source3/Makefile.in
source3/smbd/globals.h
source3/smbd/process.c
source3/smbd/smb2_server.c [new file with mode: 0644]

index 31ef29ad15a557c50db25c4bcc9c9e28c25c9825..17558c97f9615e4be663bce0041b980dda1c5732 100644 (file)
@@ -748,6 +748,7 @@ SMBD_OBJ_SRV = smbd/files.o smbd/chgpasswd.o smbd/connection.o \
               smbd/dmapi.o smbd/signing.o \
               smbd/file_access.o \
               smbd/dnsregister.o smbd/globals.o \
+              smbd/smb2_server.o \
               $(MANGLE_OBJ) @VFS_STATIC@
 
 SMBD_OBJ_BASE = $(PARAM_WITHOUT_REG_OBJ) $(SMBD_OBJ_SRV) $(LIBSMB_OBJ) \
index b646bc30fda3be8d878bb6afd39101e2aaf90ae0..e69243f4b4542f0477daaa08641846a9bfe751a5 100644 (file)
@@ -199,11 +199,87 @@ struct child_pid;
 extern struct child_pid *children;
 extern int num_children;
 
+struct tstream_context;
+struct smbd_smb2_request;
+
+bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size);
+
+void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
+                            const uint8_t *inbuf, size_t size);
+
+NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
+                                   NTSTATUS status, DATA_BLOB *info);
+NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
+                                NTSTATUS status);
+NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
+                               DATA_BLOB body, DATA_BLOB *dyn);
+
+struct smbd_smb2_request {
+       TALLOC_CTX *mem_pool;
+
+       struct smbd_server_connection *conn;
+
+       int current_idx;
+
+       struct {
+               /* the NBT header is not allocated */
+               uint8_t nbt_hdr[4];
+               /*
+                * vector[0] NBT
+                * .
+                * vector[1] SMB2
+                * vector[2] fixed body
+                * vector[3] dynamic body
+                * .
+                * .
+                * .
+                * vector[4] SMB2
+                * vector[5] fixed body
+                * vector[6] dynamic body
+                * .
+                * .
+                * .
+                */
+               struct iovec *vector;
+               int vector_count;
+       } in;
+       struct {
+               /* the NBT header is not allocated */
+               uint8_t nbt_hdr[4];
+               /*
+                * vector[0] NBT
+                * .
+                * vector[1] SMB2
+                * vector[2] fixed body
+                * vector[3] dynamic body
+                * .
+                * .
+                * .
+                * vector[4] SMB2
+                * vector[5] fixed body
+                * vector[6] dynamic body
+                * .
+                * .
+                * .
+                */
+               struct iovec *vector;
+               int vector_count;
+       } out;
+};
+
 struct smbd_server_connection {
        struct fd_event *fde;
        uint64_t num_requests;
        struct smb_signing_state *signing_state;
+       bool allow_smb2;
+       struct {
+               struct tevent_context *event_ctx;
+               struct tevent_queue *recv_queue;
+               struct tevent_queue *send_queue;
+               struct tstream_context *stream;
+       } smb2;
 };
+
 extern struct smbd_server_connection *smbd_server_conn;
 
 void smbd_init_globals(void);
index 0647b99ba022df931ce268e36fce5f960c285611..5cad8bfc9a0f9ede14604ccf55db92e635bc39fc 100644 (file)
@@ -1448,6 +1448,14 @@ static void process_smb(struct smbd_server_connection *conn,
                goto done;
        }
 
+       if (smbd_server_conn->allow_smb2) {
+               if (smbd_is_smb2_header(inbuf, nread)) {
+                       smbd_smb2_first_negprot(smbd_server_conn, inbuf, nread);
+                       return;
+               }
+               smbd_server_conn->allow_smb2 = false;
+       }
+
        show_msg((char *)inbuf);
 
        construct_reply((char *)inbuf,nread,unread_bytes,seqnum,encrypted,deferred_pcd);
@@ -2009,6 +2017,10 @@ void smbd_process(void)
                exit_server("failed to create smbd_server_connection");
        }
 
+       if (lp_maxprotocol() == PROTOCOL_SMB2) {
+               smbd_server_conn->allow_smb2 = true;
+       }
+
        /* Ensure child is set to blocking mode */
        set_blocking(smbd_server_fd(),True);
 
diff --git a/source3/smbd/smb2_server.c b/source3/smbd/smb2_server.c
new file mode 100644 (file)
index 0000000..c63c8da
--- /dev/null
@@ -0,0 +1,961 @@
+/*
+   Unix SMB/CIFS implementation.
+   Core SMB2 server
+
+   Copyright (C) Stefan Metzmacher 2009
+
+   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; either version 3 of the License, or
+   (at your option) any later version.
+
+   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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "smbd/globals.h"
+#include "../source4/libcli/smb2/smb2_constants.h"
+#include "../lib/tsocket/tsocket.h"
+
+bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
+{
+       if (size < (4 + SMB2_HDR_BODY)) {
+               return false;
+       }
+
+       if (IVAL(inbuf, 4) != SMB2_MAGIC) {
+               return false;
+       }
+
+       return true;
+}
+
+static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
+{
+       NTSTATUS status;
+       int ret;
+
+       TALLOC_FREE(conn->fde);
+
+       conn->smb2.event_ctx = smbd_event_context();
+
+       conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
+       if (conn->smb2.recv_queue == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
+       if (conn->smb2.send_queue == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
+                                         &conn->smb2.stream);
+       if (ret == -1) {
+               status = map_nt_error_from_unix(errno);
+               return status;
+       }
+
+       /* Ensure child is set to non-blocking mode */
+       set_blocking(smbd_server_fd(),false);
+       return NT_STATUS_OK;
+}
+
+#define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
+#define _smb2_setlen(_buf,len) do { \
+       uint8_t *buf = (uint8_t *)_buf; \
+       buf[0] = 0; \
+       buf[1] = ((len)&0xFF0000)>>16; \
+       buf[2] = ((len)&0xFF00)>>8; \
+       buf[3] = (len)&0xFF; \
+} while (0)
+
+static void smb2_setup_nbt_length(struct iovec *vector, int count)
+{
+       size_t len = 0;
+       int i;
+
+       for (i=1; i < count; i++) {
+               len += vector[i].iov_len;
+       }
+
+       _smb2_setlen(vector[0].iov_base, len);
+}
+
+static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
+                                        const uint8_t *inbuf, size_t size,
+                                        struct smbd_smb2_request **_req)
+{
+       TALLOC_CTX *mem_pool;
+       struct smbd_smb2_request *req;
+       uint32_t protocol_version;
+       const uint8_t *inhdr = NULL;
+       off_t ofs = 0;
+       uint16_t cmd;
+       uint32_t next_command_ofs;
+
+       if (size < (4 + SMB2_HDR_BODY + 2)) {
+               DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       inhdr = inbuf + 4;
+
+       protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
+       if (protocol_version != SMB2_MAGIC) {
+               DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
+                        protocol_version));
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
+       if (cmd != SMB2_OP_NEGPROT) {
+               DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
+                        cmd));
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
+       if (next_command_ofs != 0) {
+               DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
+                        next_command_ofs));
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       mem_pool = talloc_pool(conn, 8192);
+       if (mem_pool == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       req = talloc_zero(mem_pool, struct smbd_smb2_request);
+       if (req == NULL) {
+               talloc_free(mem_pool);
+               return NT_STATUS_NO_MEMORY;
+       }
+       req->mem_pool   = mem_pool;
+       req->conn       = conn;
+
+       talloc_steal(req, inbuf);
+
+       req->in.vector = talloc_array(req, struct iovec, 4);
+       if (req->in.vector == NULL) {
+               talloc_free(mem_pool);
+               return NT_STATUS_NO_MEMORY;
+       }
+       req->in.vector_count = 4;
+
+       memcpy(req->in.nbt_hdr, inbuf, 4);
+
+       ofs = 0;
+       req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
+       req->in.vector[0].iov_len       = 4;
+       ofs += req->in.vector[0].iov_len;
+
+       req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
+       req->in.vector[1].iov_len       = SMB2_HDR_BODY;
+       ofs += req->in.vector[1].iov_len;
+
+       req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
+       req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
+       ofs += req->in.vector[2].iov_len;
+
+       if (ofs > size) {
+               return NT_STATUS_INVALID_PARAMETER;
+       }
+
+       req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
+       req->in.vector[3].iov_len       = size - ofs;
+       ofs += req->in.vector[3].iov_len;
+
+       req->current_idx = 1;
+
+       *_req = req;
+       return NT_STATUS_OK;
+}
+
+static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
+{
+       struct iovec *vector;
+       int count;
+       int idx;
+
+       count = req->in.vector_count;
+       vector = talloc_array(req, struct iovec, count);
+       if (vector == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+
+       vector[0].iov_base      = req->out.nbt_hdr;
+       vector[0].iov_len       = 4;
+       SIVAL(req->out.nbt_hdr, 0, 0);
+
+       for (idx=1; idx < count; idx += 3) {
+               const uint8_t *inhdr = NULL;
+               uint8_t *outhdr = NULL;
+               uint8_t *outbody = NULL;
+               uint8_t *outdyn = NULL;
+               size_t outdyn_size = 1;
+               uint32_t next_command_ofs = 0;
+               struct iovec *current = &vector[idx];
+
+               if ((idx + 3) < count) {
+                       /* we have a next command */
+                       next_command_ofs = SMB2_HDR_BODY + 8 + 8;
+                       outdyn_size = 8;
+               }
+
+               inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
+
+               outhdr = talloc_array(vector, uint8_t,
+                                     SMB2_HDR_BODY + 8 + outdyn_size);
+               if (outhdr == NULL) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+
+               outbody = outhdr + SMB2_HDR_BODY;
+               outdyn = outbody + 8;
+
+               current[0].iov_base     = (void *)outhdr;
+               current[0].iov_len      = SMB2_HDR_BODY;
+
+               current[1].iov_base     = (void *)outbody;
+               current[1].iov_len      = 8;
+
+               current[2].iov_base     = (void *)outdyn;
+               current[2].iov_len      = outdyn_size;
+
+               /* setup the SMB2 header */
+               SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
+               SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
+               SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
+               SIVAL(outhdr, SMB2_HDR_STATUS,
+                     NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
+               SSVAL(outhdr, SMB2_HDR_OPCODE,
+                     SVAL(inhdr, SMB2_HDR_OPCODE));
+               SSVAL(outhdr, SMB2_HDR_CREDIT,          0);
+               SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
+               SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
+               SIVAL(outhdr, SMB2_HDR_MESSAGE_ID,
+                     IVAL(inhdr, SMB2_HDR_MESSAGE_ID));
+               SIVAL(outhdr, SMB2_HDR_PID,
+                     IVAL(inhdr, SMB2_HDR_PID));
+               SIVAL(outhdr, SMB2_HDR_TID,
+                     IVAL(inhdr, SMB2_HDR_TID));
+               SIVAL(outhdr, SMB2_HDR_SESSION_ID,
+                     IVAL(inhdr, SMB2_HDR_SESSION_ID));
+               memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
+
+               /* setup error body header */
+               SSVAL(outbody, 0x00, 9);
+               SSVAL(outbody, 0x02, 0);
+               SIVAL(outbody, 0x04, 0);
+
+               /* setup the dynamic part */
+               SCVAL(outdyn, 0x00, 0);
+       }
+
+       req->out.vector = vector;
+       req->out.vector_count = count;
+
+       /* setup the length of the NBT packet */
+       smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
+
+       return NT_STATUS_OK;
+}
+
+static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
+                                            const char *reason)
+{
+       DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
+       exit_server_cleanly(reason);
+}
+
+static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
+{
+       const uint8_t *inhdr;
+       int i = req->current_idx;
+       uint16_t opcode;
+
+       inhdr = (const uint8_t *)req->in.vector[i].iov_base;
+
+       /* TODO: verify more things */
+
+       opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
+       DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
+       switch (opcode) {
+       case SMB2_OP_NEGPROT:
+       case SMB2_OP_SESSSETUP:
+       case SMB2_OP_LOGOFF:
+       case SMB2_OP_TCON:
+       case SMB2_OP_TDIS:
+       case SMB2_OP_CREATE:
+       case SMB2_OP_CLOSE:
+       case SMB2_OP_FLUSH:
+       case SMB2_OP_READ:
+       case SMB2_OP_WRITE:
+       case SMB2_OP_LOCK:
+       case SMB2_OP_IOCTL:
+       case SMB2_OP_CANCEL:
+       case SMB2_OP_KEEPALIVE:
+       case SMB2_OP_FIND:
+       case SMB2_OP_NOTIFY:
+       case SMB2_OP_GETINFO:
+       case SMB2_OP_SETINFO:
+       case SMB2_OP_BREAK:
+               return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
+       }
+
+       return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
+}
+
+static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
+static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
+
+static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
+{
+       struct tevent_req *subreq;
+
+       /* TODO: sign the response here */
+
+       smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
+
+       req->current_idx += 3;
+
+       if (req->current_idx > req->in.vector_count) {
+               struct timeval zero = timeval_zero();
+               subreq = tevent_wakeup_send(req,
+                                           req->conn->smb2.event_ctx,
+                                           zero);
+               if (subreq == NULL) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+               tevent_req_set_callback(subreq,
+                                       smbd_smb2_request_dispatch_compound,
+                                       req);
+
+               return NT_STATUS_OK;
+       }
+
+       subreq = tstream_writev_queue_send(req,
+                                          req->conn->smb2.event_ctx,
+                                          req->conn->smb2.stream,
+                                          req->conn->smb2.send_queue,
+                                          req->out.vector,
+                                          req->out.vector_count);
+       if (subreq == NULL) {
+               return NT_STATUS_NO_MEMORY;
+       }
+       tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
+
+       return NT_STATUS_OK;
+}
+
+NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
+                                   NTSTATUS status,
+                                   DATA_BLOB *info)
+{
+       uint8_t *outhdr;
+       uint8_t *outbody;
+       int i = req->current_idx;
+
+       DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
+                 i, nt_errstr(status), info ? " +info" : ""));
+
+       outhdr = (uint8_t *)req->out.vector[i].iov_base;
+
+       SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
+
+       outbody = outhdr + SMB2_HDR_BODY;
+
+       req->out.vector[i+1].iov_base = (void *)outbody;
+       req->out.vector[i+1].iov_len = 8;
+
+       if (info) {
+               SIVAL(outbody, 0x04, info->length);
+               req->out.vector[i+2].iov_base   = (void *)info->data;
+               req->out.vector[i+2].iov_len    = info->length;
+       } else {
+               req->out.vector[i+2].iov_base = (void *)(outbody + 8);
+               req->out.vector[i+2].iov_len = 1;
+       }
+
+       /* the error packet is the last response in the chain */
+       SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
+       req->out.vector_count = req->current_idx + 3;
+
+       return smbd_smb2_request_reply(req);
+}
+
+NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
+                                NTSTATUS status)
+{
+       return smbd_smb2_request_error_ex(req, status, NULL);
+}
+
+NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
+                               DATA_BLOB body, DATA_BLOB *dyn)
+{
+       uint8_t *outhdr;
+       uint8_t *outdyn;
+       int i = req->current_idx;
+       uint32_t next_command_ofs;
+
+       DEBUG(10,("smbd_smb2_request_done: idx[%d] body[%u] dyn[%s:%u]\n",
+                 i, (unsigned int)body.length,
+                 dyn ? "yes": "no",
+                 (unsigned int)(dyn ? dyn->length : 0)));
+
+       if (body.length < 2) {
+               return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
+       }
+
+       if ((body.length % 2) != 0) {
+               return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
+       }
+
+       outhdr = (uint8_t *)req->out.vector[i].iov_base;
+       /* the fallback dynamic buffer */
+       outdyn = outhdr + SMB2_HDR_BODY + 8;
+
+       next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
+       SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(NT_STATUS_OK));
+
+       req->out.vector[i+1].iov_base = (void *)body.data;
+       req->out.vector[i+1].iov_len = body.length;
+
+       if (dyn) {
+               if (dyn->length > 0) {
+                       req->out.vector[i+2].iov_base   = (void *)dyn->data;
+                       req->out.vector[i+2].iov_len    = dyn->length;
+               } else {
+                       req->out.vector[i+2].iov_base   = (void *)outdyn;
+                       req->out.vector[i+2].iov_len    = 1;
+               }
+       } else {
+               req->out.vector[i+2].iov_base = NULL;
+               req->out.vector[i+2].iov_len = 0;
+       }
+
+       /* see if we need to recalculate the offset to the next response */
+       if (next_command_ofs > 0) {
+               next_command_ofs  = SMB2_HDR_BODY;
+               next_command_ofs += req->out.vector[i+1].iov_len;
+               next_command_ofs += req->out.vector[i+2].iov_len;
+       }
+
+       /* TODO: we need to add padding ... */
+       if ((next_command_ofs % 8) != 0) {
+               return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
+       }
+
+       /* the error packet is the last response in the chain */
+       SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
+
+       return smbd_smb2_request_reply(req);
+}
+
+static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
+{
+       struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
+                                       struct smbd_smb2_request);
+       struct smbd_server_connection *conn = req->conn;
+       NTSTATUS status;
+
+       tevent_wakeup_recv(subreq);
+       TALLOC_FREE(subreq);
+
+       DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
+                 req->current_idx, req->in.vector_count));
+
+       status = smbd_smb2_request_dispatch(req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+}
+
+static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
+{
+       struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
+                                       struct smbd_smb2_request);
+       struct smbd_server_connection *conn = req->conn;
+       int ret;
+       int sys_errno;
+       TALLOC_CTX *mem_pool;
+
+       ret = tstream_writev_queue_recv(subreq, &sys_errno);
+       TALLOC_FREE(subreq);
+       if (ret == -1) {
+               NTSTATUS status = map_nt_error_from_unix(sys_errno);
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       mem_pool = req->mem_pool;
+       req = NULL;
+       talloc_free(mem_pool);
+}
+
+struct smbd_smb2_request_read_state {
+       size_t missing;
+       bool asked_for_header;
+       struct smbd_smb2_request *smb2_req;
+};
+
+static int smbd_smb2_request_next_vector(struct tstream_context *stream,
+                                        void *private_data,
+                                        TALLOC_CTX *mem_ctx,
+                                        struct iovec **_vector,
+                                        size_t *_count);
+static void smbd_smb2_request_read_done(struct tevent_req *subreq);
+
+static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
+                                       struct tevent_context *ev,
+                                       struct smbd_server_connection *conn)
+{
+       struct tevent_req *req;
+       struct smbd_smb2_request_read_state *state;
+       struct tevent_req *subreq;
+       TALLOC_CTX *mem_pool;
+
+       req = tevent_req_create(mem_ctx, &state,
+                               struct smbd_smb2_request_read_state);
+       if (req == NULL) {
+               return NULL;
+       }
+       state->missing = 0;
+       state->asked_for_header = false;
+
+       mem_pool = talloc_pool(state, 8192);
+       if (tevent_req_nomem(mem_pool, req)) {
+               return tevent_req_post(req, ev);
+       }
+
+       state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
+       if (tevent_req_nomem(state->smb2_req, req)) {
+               return tevent_req_post(req, ev);
+       }
+
+       state->smb2_req->mem_pool       = mem_pool;
+       state->smb2_req->conn           = conn;
+
+       subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
+                                             conn->smb2.recv_queue,
+                                             smbd_smb2_request_next_vector,
+                                             state);
+       if (tevent_req_nomem(subreq, req)) {
+               return tevent_req_post(req, ev);
+       }
+       tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
+
+       return req;
+}
+
+static int smbd_smb2_request_next_vector(struct tstream_context *stream,
+                                        void *private_data,
+                                        TALLOC_CTX *mem_ctx,
+                                        struct iovec **_vector,
+                                        size_t *_count)
+{
+       struct smbd_smb2_request_read_state *state =
+               talloc_get_type_abort(private_data,
+               struct smbd_smb2_request_read_state);
+       struct smbd_smb2_request *req = state->smb2_req;
+       struct iovec *vector;
+       int idx = req->in.vector_count;
+       size_t len = 0;
+       uint8_t *buf = NULL;
+
+       if (req->in.vector_count == 0) {
+               /*
+                * first we need to get the NBT header
+                */
+               req->in.vector = talloc_array(req, struct iovec,
+                                             req->in.vector_count + 1);
+               if (req->in.vector == NULL) {
+                       return -1;
+               }
+               req->in.vector_count += 1;
+
+               req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
+               req->in.vector[idx].iov_len     = 4;
+
+               vector = talloc_array(mem_ctx, struct iovec, 1);
+               if (vector == NULL) {
+                       return -1;
+               }
+
+               vector[0] = req->in.vector[idx];
+
+               *_vector = vector;
+               *_count = 1;
+               return 0;
+       }
+
+       if (req->in.vector_count == 1) {
+               /*
+                * Now we analyze the NBT header
+                */
+               state->missing = smb2_len(req->in.vector[0].iov_base);
+
+               if (state->missing == 0) {
+                       /* if there're no remaining bytes, we're done */
+                       *_vector = NULL;
+                       *_count = 0;
+                       return 0;
+               }
+
+               req->in.vector = talloc_realloc(req, req->in.vector,
+                                               struct iovec,
+                                               req->in.vector_count + 1);
+               if (req->in.vector == NULL) {
+                       return -1;
+               }
+               req->in.vector_count += 1;
+
+               if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
+                       /*
+                        * it's a special NBT message,
+                        * so get all remaining bytes
+                        */
+                       len = state->missing;
+               } else if (state->missing < (SMB2_HDR_BODY + 2)) {
+                       /*
+                        * it's an invalid message, just read what we can get
+                        * and let the caller handle the error
+                        */
+                       len = state->missing;
+               } else {
+                       /*
+                        * We assume it's a SMB2 request,
+                        * and we first get the header and the
+                        * first 2 bytes (the struct size) of the body
+                        */
+                       len = SMB2_HDR_BODY + 2;
+
+                       state->asked_for_header = true;
+               }
+
+               state->missing -= len;
+
+               buf = talloc_array(req->in.vector, uint8_t, len);
+               if (buf == NULL) {
+                       return -1;
+               }
+
+               req->in.vector[idx].iov_base    = (void *)buf;
+               req->in.vector[idx].iov_len     = len;
+
+               vector = talloc_array(mem_ctx, struct iovec, 1);
+               if (vector == NULL) {
+                       return -1;
+               }
+
+               vector[0] = req->in.vector[idx];
+
+               *_vector = vector;
+               *_count = 1;
+               return 0;
+       }
+
+       if (state->missing == 0) {
+               /* if there're no remaining bytes, we're done */
+               *_vector = NULL;
+               *_count = 0;
+               return 0;
+       }
+
+       if (state->asked_for_header) {
+               const uint8_t *hdr;
+               size_t full_size;
+               size_t next_command_ofs;
+               size_t body_size;
+               uint8_t *body;
+               size_t dyn_size;
+               uint8_t *dyn;
+               bool invalid = false;
+
+               state->asked_for_header = false;
+
+               /*
+                * We got the SMB2 header and the first 2 bytes
+                * of the body. We fix the size to just the header
+                * and manually copy the 2 first bytes to the body section
+                */
+               req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
+               hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
+
+               /* allocate vectors for body and dynamic areas */
+               req->in.vector = talloc_realloc(req, req->in.vector,
+                                               struct iovec,
+                                               req->in.vector_count + 2);
+               if (req->in.vector == NULL) {
+                       return -1;
+               }
+               req->in.vector_count += 2;
+
+               full_size = state->missing + SMB2_HDR_BODY + 2;
+               next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
+               body_size = SVAL(hdr, SMB2_HDR_BODY);
+
+               if (next_command_ofs != 0) {
+                       if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
+                               /*
+                                * this is invalid, just return a zero
+                                * body and let the caller deal with the error
+                                */
+                               invalid = true;
+                       } else if (next_command_ofs > full_size) {
+                               /*
+                                * this is invalid, just return a zero
+                                * body and let the caller deal with the error
+                                */
+                               invalid = true;
+                       } else {
+                               full_size = next_command_ofs;
+                       }
+               }
+
+               if (!invalid) {
+                       if (body_size < 2) {
+                               /*
+                                * this is invalid, just return a zero
+                                * body and let the caller deal with the error
+                                */
+                               invalid = true;
+                       } else if (body_size > (full_size - SMB2_HDR_BODY)) {
+                               /*
+                                * this is invalid, just return a zero
+                                * body and let the caller deal with the error
+                                */
+                               invalid = true;
+                       }
+               }
+
+               if (invalid) {
+                       /* the caller should check this */
+                       body_size = 0;
+               }
+
+               if ((body_size % 2) != 0) {
+                       body_size -= 1;
+               }
+
+               dyn_size = full_size - (SMB2_HDR_BODY + body_size);
+
+               state->missing -= (body_size - 2) + dyn_size;
+
+               body = talloc_array(req->in.vector, uint8_t, body_size);
+               if (body == NULL) {
+                       return -1;
+               }
+
+               dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
+               if (dyn == NULL) {
+                       return -1;
+               }
+
+               req->in.vector[idx].iov_base    = (void *)body;
+               req->in.vector[idx].iov_len     = body_size;
+               req->in.vector[idx+1].iov_base  = (void *)dyn;
+               req->in.vector[idx+1].iov_len   = dyn_size;
+
+               vector = talloc_array(mem_ctx, struct iovec, 2);
+               if (vector == NULL) {
+                       return -1;
+               }
+
+               /*
+                * the first 2 bytes of the body were already fetched
+                * together with the header
+                */
+               memcpy(body, hdr + SMB2_HDR_BODY, 2);
+               vector[0].iov_base = body + 2;
+               vector[0].iov_len = req->in.vector[idx].iov_len - 2;
+
+               vector[1] = req->in.vector[idx+1];
+
+               *_vector = vector;
+               *_count = 2;
+               return 0;
+       }
+
+       /*
+        * when we endup here, we're looking for a new SMB2 request
+        * next. And we ask for its header and the first 2 bytes of
+        * the body (like we did for the first SMB2 request).
+        */
+
+       req->in.vector = talloc_realloc(req, req->in.vector,
+                                       struct iovec,
+                                       req->in.vector_count + 1);
+       if (req->in.vector == NULL) {
+               return -1;
+       }
+       req->in.vector_count += 1;
+
+       /*
+        * We assume it's a SMB2 request,
+        * and we first get the header and the
+        * first 2 bytes (the struct size) of the body
+        */
+       len = SMB2_HDR_BODY + 2;
+
+       if (len > state->missing) {
+               /* let the caller handle the error */
+               len = state->missing;
+       }
+
+       state->missing -= len;
+       state->asked_for_header = true;
+
+       buf = talloc_array(req->in.vector, uint8_t, len);
+       if (buf == NULL) {
+               return -1;
+       }
+
+       req->in.vector[idx].iov_base    = (void *)buf;
+       req->in.vector[idx].iov_len     = len;
+
+       vector = talloc_array(mem_ctx, struct iovec, 1);
+       if (vector == NULL) {
+               return -1;
+       }
+
+       vector[0] = req->in.vector[idx];
+
+       *_vector = vector;
+       *_count = 1;
+       return 0;
+}
+
+static void smbd_smb2_request_read_done(struct tevent_req *subreq)
+{
+       struct tevent_req *req =
+               tevent_req_callback_data(subreq,
+               struct tevent_req);
+       int ret;
+       int sys_errno;
+       NTSTATUS status;
+
+       ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
+       if (ret == -1) {
+               status = map_nt_error_from_unix(sys_errno);
+               tevent_req_nterror(req, status);
+               return;
+       }
+
+       tevent_req_done(req);
+}
+
+static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
+                                           TALLOC_CTX *mem_ctx,
+                                           struct smbd_smb2_request **_smb2_req)
+{
+       struct smbd_smb2_request_read_state *state =
+               tevent_req_data(req,
+               struct smbd_smb2_request_read_state);
+       NTSTATUS status;
+
+       if (tevent_req_is_nterror(req, &status)) {
+               tevent_req_received(req);
+               return status;
+       }
+
+       talloc_steal(mem_ctx, state->smb2_req->mem_pool);
+       *_smb2_req = state->smb2_req;
+       tevent_req_received(req);
+       return NT_STATUS_OK;
+}
+
+static void smbd_smb2_request_incoming(struct tevent_req *subreq);
+
+void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
+                            const uint8_t *inbuf, size_t size)
+{
+       NTSTATUS status;
+       struct smbd_smb2_request *req;
+       struct tevent_req *subreq;
+
+       DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
+                (unsigned int)size));
+
+       status = smbd_initialize_smb2(conn);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       status = smbd_smb2_request_create(conn, inbuf, size, &req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       status = smbd_smb2_request_setup_out(req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       status = smbd_smb2_request_dispatch(req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       /* ask for the next request */
+       subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
+       if (subreq == NULL) {
+               smbd_server_connection_terminate(conn, "no memory for reading");
+               return;
+       }
+       tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
+}
+
+static void smbd_smb2_request_incoming(struct tevent_req *subreq)
+{
+       struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
+                                             struct smbd_server_connection);
+       NTSTATUS status;
+       struct smbd_smb2_request *req;
+
+       status = smbd_smb2_request_read_recv(subreq, conn, &req);
+       TALLOC_FREE(subreq);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       /* TODO: validate the incoming request */
+       req->current_idx = 1;
+
+       DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
+                req->current_idx, req->in.vector_count));
+
+       status = smbd_smb2_request_setup_out(req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       status = smbd_smb2_request_dispatch(req);
+       if (!NT_STATUS_IS_OK(status)) {
+               smbd_server_connection_terminate(conn, nt_errstr(status));
+               return;
+       }
+
+       /* ask for the next request (this constructs the main loop) */
+       subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
+       if (subreq == NULL) {
+               smbd_server_connection_terminate(conn, "no memory for reading");
+               return;
+       }
+       tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
+}