From f7a67af300f68dfb445bcf3800e3818931afcbc9 Mon Sep 17 00:00:00 2001
From: Jeremy Allison <jra@samba.org>
Date: Wed, 21 Dec 2016 13:55:50 -0800
Subject: [PATCH] s3: libsmb: Add cli_smb2_ftruncate(), plumb into
 cli_ftruncate().

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12479

Signed-off-by: Jeremy Allison <jra@samba.org>
---
 source3/libsmb/cli_smb2_fnum.c | 65 ++++++++++++++++++++++++++++++++++++++++++
 source3/libsmb/cli_smb2_fnum.h |  3 ++
 source3/libsmb/clifile.c       |  8 +++++-
 3 files changed, 75 insertions(+), 1 deletion(-)

diff --git a/source3/libsmb/cli_smb2_fnum.c b/source3/libsmb/cli_smb2_fnum.c
index 266f2d3..848e077 100644
--- a/source3/libsmb/cli_smb2_fnum.c
+++ b/source3/libsmb/cli_smb2_fnum.c
@@ -3574,3 +3574,68 @@ NTSTATUS cli_smb2_shadow_copy_data(TALLOC_CTX *mem_ctx,
 	TALLOC_FREE(frame);
 	return status;
 }
+
+/***************************************************************
+ Wrapper that allows SMB2 to truncate a file.
+ Synchronous only.
+***************************************************************/
+
+NTSTATUS cli_smb2_ftruncate(struct cli_state *cli,
+			uint16_t fnum,
+			uint64_t newsize)
+{
+	NTSTATUS status;
+	DATA_BLOB inbuf = data_blob_null;
+	struct smb2_hnd *ph = NULL;
+	TALLOC_CTX *frame = talloc_stackframe();
+
+	if (smbXcli_conn_has_async_calls(cli->conn)) {
+		/*
+		 * Can't use sync call while an async call is in flight
+		 */
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
+
+	if (smbXcli_conn_protocol(cli->conn) < PROTOCOL_SMB2_02) {
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
+
+	status = map_fnum_to_smb2_handle(cli,
+					fnum,
+					&ph);
+	if (!NT_STATUS_IS_OK(status)) {
+		goto fail;
+	}
+
+	inbuf = data_blob_talloc_zero(frame, 8);
+	if (inbuf.data == NULL) {
+		status = NT_STATUS_NO_MEMORY;
+		goto fail;
+	}
+
+	SBVAL(inbuf.data, 0, newsize);
+
+	/* setinfo on the handle with info_type SMB2_SETINFO_FILE (1),
+	   level 20 (SMB_FILE_END_OF_FILE_INFORMATION - 1000). */
+
+	status = smb2cli_set_info(cli->conn,
+				cli->timeout,
+				cli->smb2.session,
+				cli->smb2.tcon,
+				1, /* in_info_type */
+					/* in_file_info_class */
+				SMB_FILE_END_OF_FILE_INFORMATION - 1000,
+				&inbuf, /* in_input_buffer */
+				0, /* in_additional_info */
+				ph->fid_persistent,
+				ph->fid_volatile);
+
+  fail:
+
+	cli->raw_status = status;
+
+	TALLOC_FREE(frame);
+	return status;
+}
diff --git a/source3/libsmb/cli_smb2_fnum.h b/source3/libsmb/cli_smb2_fnum.h
index 3289f7e..12c42a2 100644
--- a/source3/libsmb/cli_smb2_fnum.h
+++ b/source3/libsmb/cli_smb2_fnum.h
@@ -208,4 +208,7 @@ NTSTATUS cli_smb2_shadow_copy_data(TALLOC_CTX *mem_ctx,
 			bool get_names,
 			char ***pnames,
 			int *pnum_names);
+NTSTATUS cli_smb2_ftruncate(struct cli_state *cli,
+			uint16_t fnum,
+			uint64_t newsize);
 #endif /* __SMB2CLI_FNUM_H__ */
diff --git a/source3/libsmb/clifile.c b/source3/libsmb/clifile.c
index 5e667bd..03dd640 100644
--- a/source3/libsmb/clifile.c
+++ b/source3/libsmb/clifile.c
@@ -2819,11 +2819,17 @@ NTSTATUS cli_ftruncate_recv(struct tevent_req *req)
 
 NTSTATUS cli_ftruncate(struct cli_state *cli, uint16_t fnum, uint64_t size)
 {
-	TALLOC_CTX *frame = talloc_stackframe();
+	TALLOC_CTX *frame = NULL;
 	struct tevent_context *ev = NULL;
 	struct tevent_req *req = NULL;
 	NTSTATUS status = NT_STATUS_OK;
 
+	if (smbXcli_conn_protocol(cli->conn) >= PROTOCOL_SMB2_02) {
+		return cli_smb2_ftruncate(cli, fnum, size);
+	}
+
+	frame = talloc_stackframe();
+
 	if (smbXcli_conn_has_async_calls(cli->conn)) {
 		/*
 		 * Can't use sync call while an async call is in flight
-- 
2.7.4