1 files changed, 175 insertions, 0 deletions
diff --git a/source3/smbd/error.c b/source3/smbd/error.c
new file mode 100644
index 0000000..fdea191
--- /dev/null
+++ b/source3/smbd/error.c
@@ -0,0 +1,175 @@
+/* 
+   Unix SMB/CIFS implementation.
+   error packet handling
+   Copyright (C) Andrew Tridgell 1992-1998
+
+   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/smbd.h"
+#include "smbd/globals.h"
+
+bool use_nt_status(void)
+{
+	return lp_nt_status_support() && (global_client_caps & CAP_STATUS32);
+}
+
+/****************************************************************************
+ Create an error packet. Normally called using the ERROR() macro.
+
+ Setting eclass and ecode to zero and status to a valid NT error will
+ reply with an NT error if the client supports CAP_STATUS32, otherwise
+ it maps to and returns a DOS error if the client doesn't support CAP_STATUS32.
+ This is the normal mode of calling this function via reply_nterror(req, status).
+
+ Setting eclass and ecode to non-zero and status to NT_STATUS_OK (0) will map
+ from a DOS error to an NT error and reply with an NT error if the client
+ supports CAP_STATUS32, otherwise it replies with the given DOS error.
+ This mode is currently not used in the server.
+
+ Setting both eclass, ecode and status to non-zero values allows a non-default
+ mapping from NT error codes to DOS error codes, and will return one or the
+ other depending on the client supporting CAP_STATUS32 or not. This is the
+ path taken by calling reply_botherror(req, eclass, ecode, status);
+
+ Setting status to NT_STATUS_DOS(eclass, ecode) forces DOS errors even if the
+ client supports CAP_STATUS32. This is the path taken to force a DOS error
+ reply by calling reply_force_doserror(req, eclass, ecode).
+
+ Setting status only and eclass to -1 forces NT errors even if the client
+ doesn't support CAP_STATUS32. This mode is currently never used in the
+ server.
+****************************************************************************/
+
+void error_packet_set(char *outbuf, uint8_t eclass, uint32_t ecode, NTSTATUS ntstatus, int line, const char *file)
+{
+	bool force_nt_status = False;
+	bool force_dos_status = False;
+
+	if (eclass == (uint8_t)-1) {
+		force_nt_status = True;
+	} else if (NT_STATUS_IS_DOS(ntstatus)) {
+		force_dos_status = True;
+	}
+
+	if (force_nt_status || (!force_dos_status && lp_nt_status_support() && (global_client_caps & CAP_STATUS32))) {
+		/* We're returning an NT error. */
+		if (NT_STATUS_V(ntstatus) == 0 && eclass) {
+			ntstatus = dos_to_ntstatus(eclass, ecode);
+		}
+		SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
+		SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
+		/* This must not start with the word 'error', as this
+		 * is reserved in the subunit stream protocol, causing
+		 * false errors to show up when debugging is turned
+		 * on */
+		DEBUG(3,("NT error packet at %s(%d) cmd=%d (%s) %s\n",
+			 file, line,
+			 (int)CVAL(outbuf,smb_com),
+#if defined(WITH_SMB1SERVER)
+			 smb_fn_name(CVAL(outbuf,smb_com)),
+#else
+			 "",
+#endif
+			 nt_errstr(ntstatus)));
+	} else {
+		/* We're returning a DOS error only,
+		 * nt_status_to_dos() pulls DOS error codes out of the
+		 * NTSTATUS */
+		if (NT_STATUS_IS_DOS(ntstatus) || (eclass == 0 && NT_STATUS_V(ntstatus))) {
+			ntstatus_to_dos(ntstatus, &eclass, &ecode);
+		}
+
+		SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
+		SSVAL(outbuf,smb_rcls,eclass);
+		SSVAL(outbuf,smb_err,ecode);  
+
+		/* This must not start with the word 'error', as this
+		 * is reserved in the subunit stream protocol, causing
+		 * false errors to show up when debugging is turned
+		 * on */
+		DEBUG(3,("DOS error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
+			  file, line,
+			  (int)CVAL(outbuf,smb_com),
+#if defined(WITH_SMB1SERVER)
+			  smb_fn_name(CVAL(outbuf,smb_com)),
+#else
+			  "",
+#endif
+			  eclass,
+			  ecode));
+	}
+}
+
+size_t error_packet(char *outbuf, uint8_t eclass, uint32_t ecode, NTSTATUS ntstatus, int line, const char *file)
+{
+	size_t outsize = srv_smb1_set_message(outbuf,0,0,True);
+	error_packet_set(outbuf, eclass, ecode, ntstatus, line, file);
+	return outsize;
+}
+
+void reply_nt_error(struct smb_request *req, NTSTATUS ntstatus,
+		    int line, const char *file)
+{
+	TALLOC_FREE(req->outbuf);
+	reply_smb1_outbuf(req, 0, 0);
+	error_packet_set((char *)req->outbuf, 0, 0, ntstatus, line, file);
+}
+
+/****************************************************************************
+ Forces a DOS error on the wire.
+****************************************************************************/
+
+void reply_force_dos_error(struct smb_request *req, uint8_t eclass, uint32_t ecode,
+		    int line, const char *file)
+{
+	TALLOC_FREE(req->outbuf);
+	reply_smb1_outbuf(req, 0, 0);
+	error_packet_set((char *)req->outbuf,
+			eclass, ecode,
+			NT_STATUS_DOS(eclass, ecode),
+			line,
+			file);
+}
+
+void reply_both_error(struct smb_request *req, uint8_t eclass, uint32_t ecode,
+		      NTSTATUS status, int line, const char *file)
+{
+	TALLOC_FREE(req->outbuf);
+	reply_smb1_outbuf(req, 0, 0);
+	error_packet_set((char *)req->outbuf, eclass, ecode, status,
+			 line, file);
+}
+
+void reply_openerror(struct smb_request *req, NTSTATUS status)
+{
+	if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
+		/*
+		 * We hit an existing file, and if we're returning DOS
+		 * error codes OBJECT_NAME_COLLISION would map to
+		 * ERRDOS/183, we need to return ERRDOS/80, see bug
+		 * 4852.
+		 */
+		reply_botherror(req, NT_STATUS_OBJECT_NAME_COLLISION,
+			ERRDOS, ERRfilexists);
+	} else if (NT_STATUS_EQUAL(status, NT_STATUS_TOO_MANY_OPENED_FILES)) {
+		/* EMFILE always seems to be returned as a DOS error.
+		 * See bug 6837. NOTE this forces a DOS error on the wire
+		 * even though it's calling reply_nterror(). */
+		reply_force_doserror(req, ERRDOS, ERRnofids);
+	} else {
+		reply_nterror(req, status);
+	}
+}