summaryrefslogtreecommitdiff
path: root/source4/libcli/raw/raweas.c
blob: e07fbcd2884d0452f6ac6eedaf9be993078ace08 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/* 
   Unix SMB/CIFS implementation.
   parsing of EA (extended attribute) lists
   Copyright (C) Andrew Tridgell 2003
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/*
  work out how many bytes on the wire a ea list will consume. 
  This assumes the names are strict ascii, which should be a
  reasonable assumption
*/
uint_t ea_list_size(uint_t num_eas, struct ea_struct *eas)
{
	uint_t total = 4;
	int i;
	for (i=0;i<num_eas;i++) {
		total += 4 + strlen(eas[i].name.s)+1 + eas[i].value.length;
	}
	return total;
}

/*
  put a ea_list into a pre-allocated buffer - buffer must be at least
  of size ea_list_size()
*/
void ea_put_list(char *data, uint_t num_eas, struct ea_struct *eas)
{
	int i;
	uint32_t ea_size;

	ea_size = ea_list_size(num_eas, eas);

	SIVAL(data, 0, ea_size);
	data += 4;

	for (i=0;i<num_eas;i++) {
		uint_t nlen = strlen(eas[i].name.s);
		SCVAL(data, 0, eas[i].flags);
		SCVAL(data, 1, nlen);
		SSVAL(data, 2, eas[i].value.length);
		memcpy(data+4, eas[i].name.s, nlen+1);
		memcpy(data+4+nlen+1, eas[i].value.data, eas[i].value.length);
		data += 4+nlen+1+eas[i].value.length;
	}
}


/*
  pull a ea_struct from a buffer. Return the number of bytes consumed
*/
uint_t ea_pull_struct(const DATA_BLOB *blob, 
		      TALLOC_CTX *mem_ctx,
		      struct ea_struct *ea)
{
	uint8_t nlen;
	uint16_t vlen;

	if (blob->length < 6) {
		return 0;
	}

	ea->flags = CVAL(blob->data, 0);
	nlen = CVAL(blob->data, 1);
	vlen = SVAL(blob->data, 2);

	if (nlen+1+vlen > blob->length-4) {
		return 0;
	}

	ea->name.s = talloc_strndup(mem_ctx, blob->data+4, nlen);
	ea->name.private_length = nlen;
	ea->value = data_blob_talloc(mem_ctx, NULL, vlen+1);
	if (!ea->value.data) return 0;
	if (vlen) {
		memcpy(ea->value.data, blob->data+4+nlen+1, vlen);
	}
	ea->value.data[vlen] = 0;
	ea->value.length--;

	return 4 + nlen+1 + vlen;
}


/*
  pull a ea_list from a buffer
*/
NTSTATUS ea_pull_list(const DATA_BLOB *blob, 
		      TALLOC_CTX *mem_ctx,
		      uint_t *num_eas, struct ea_struct **eas)
{
	int n;
	uint32_t ea_size, ofs;

	if (blob->length < 4) {
		return NT_STATUS_INFO_LENGTH_MISMATCH;
	}

	ea_size = IVAL(blob->data, 0);
	if (ea_size > blob->length) {
		return NT_STATUS_INVALID_PARAMETER;
	}
	
	ofs = 4;	
	n = 0;
	*num_eas = 0;
	*eas = NULL;

	while (ofs < ea_size) {
		uint_t len;
		DATA_BLOB blob2;

		blob2.data = blob->data + ofs;
		blob2.length = ea_size - ofs;

		*eas = talloc_realloc(mem_ctx, *eas, sizeof(**eas) * (n+1));
		if (! *eas) return NT_STATUS_NO_MEMORY;

		len = ea_pull_struct(&blob2, mem_ctx, &(*eas)[n]);
		if (len == 0) {
			return NT_STATUS_INVALID_PARAMETER;
		}

		ofs += len;
		n++;
	}

	*num_eas = n;

	return NT_STATUS_OK;
}