s3:lib: Factor read_ea_list_entry() and read_nttrans_ea_list() out so they can be used by the SMB2 client code.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

2 files changed, 162 insertions, 0 deletions

diff --git a/source3/lib/util_ea.c b/source3/lib/util_ea.c
new file mode 100644
index 0000000000..81684da4cb
--- /dev/null
+++ b/source3/lib/util_ea.c
@@ -0,0 +1,126 @@
+/*
+   Unix SMB/CIFS implementation.
+   SMB Extended attribute buffer handling
+   Copyright (C) Jeremy Allison                 2005-2013
+   Copyright (C) Tim Prouty			2008
+
+   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 "lib/util_ea.h"
+
+/****************************************************************************
+ Read one EA list entry from the buffer.
+****************************************************************************/
+
+struct ea_list *read_ea_list_entry(TALLOC_CTX *ctx, const char *pdata, size_t data_size, size_t *pbytes_used)
+{
+	struct ea_list *eal = talloc_zero(ctx, struct ea_list);
+	uint16 val_len;
+	unsigned int namelen;
+	size_t converted_size;
+
+	if (!eal) {
+		return NULL;
+	}
+
+	if (data_size < 6) {
+		return NULL;
+	}
+
+	eal->ea.flags = CVAL(pdata,0);
+	namelen = CVAL(pdata,1);
+	val_len = SVAL(pdata,2);
+
+	if (4 + namelen + 1 + val_len > data_size) {
+		return NULL;
+	}
+
+	/* Ensure the name is null terminated. */
+	if (pdata[namelen + 4] != '\0') {
+		return NULL;
+	}
+	if (!pull_ascii_talloc(ctx, &eal->ea.name, pdata + 4, &converted_size)) {
+		DEBUG(0,("read_ea_list_entry: pull_ascii_talloc failed: %s",
+			strerror(errno)));
+	}
+	if (!eal->ea.name) {
+		return NULL;
+	}
+
+	eal->ea.value = data_blob_talloc(eal, NULL, (size_t)val_len + 1);
+	if (!eal->ea.value.data) {
+		return NULL;
+	}
+
+	memcpy(eal->ea.value.data, pdata + 4 + namelen + 1, val_len);
+
+	/* Ensure we're null terminated just in case we print the value. */
+	eal->ea.value.data[val_len] = '\0';
+	/* But don't count the null. */
+	eal->ea.value.length--;
+
+	if (pbytes_used) {
+		*pbytes_used = 4 + namelen + 1 + val_len;
+	}
+
+	DEBUG(10,("read_ea_list_entry: read ea name %s\n", eal->ea.name));
+	dump_data(10, eal->ea.value.data, eal->ea.value.length);
+
+	return eal;
+}
+
+/****************************************************************************
+ Read a list of EA names and data from an incoming data buffer. Create an ea_list with them.
+****************************************************************************/
+
+struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size)
+{
+	struct ea_list *ea_list_head = NULL;
+	size_t offset = 0;
+
+	if (data_size < 4) {
+		return NULL;
+	}
+
+	while (offset + 4 <= data_size) {
+		size_t next_offset = IVAL(pdata,offset);
+		struct ea_list *eal = read_ea_list_entry(ctx, pdata + offset + 4, data_size - offset - 4, NULL);
+
+		if (!eal) {
+			return NULL;
+		}
+
+		DLIST_ADD_END(ea_list_head, eal, struct ea_list *);
+		if (next_offset == 0) {
+			break;
+		}
+
+		/* Integer wrap protection for the increment. */
+		if (offset + next_offset < offset) {
+			break;
+		}
+
+		offset += next_offset;
+
+		/* Integer wrap protection for while loop. */
+		if (offset + 4 < offset) {
+			break;
+		}
+
+	}
+
+	return ea_list_head;
+}
diff --git a/source3/lib/util_ea.h b/source3/lib/util_ea.h
new file mode 100644
index 0000000000..54423ac287
--- /dev/null
+++ b/source3/lib/util_ea.h
@@ -0,0 +1,36 @@
+/*
+   Unix SMB/CIFS implementation.
+   SMB Extended attribute buffer handling
+   Copyright (C) Jeremy Allison                 2005-2013
+   Copyright (C) Tim Prouty			2008
+
+   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/>.
+*/
+
+#ifndef __LIB_UTIL_EA_H__
+#define __LIB_UTIL_EA_H__
+
+/****************************************************************************
+ Read one EA list entry from a buffer.
+****************************************************************************/
+
+struct ea_list *read_ea_list_entry(TALLOC_CTX *ctx, const char *pdata, size_t data_size, size_t *pbytes_used);
+
+/****************************************************************************
+ Read a list of EA names and data from an incoming data buffer. Create an ea_list with them.
+****************************************************************************/
+
+struct ea_list *read_nttrans_ea_list(TALLOC_CTX *ctx, const char *pdata, size_t data_size);
+
+#endif /* __LIB_UTIL_EA_H__ */