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
|
/* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file recommend_pkg.c
* \brief Code related to the recommended-packages subsystem.
*
* Currently unused.
**/
#include "core/or/or.h"
#include "feature/dirauth/recommend_pkg.h"
/** Return true iff <b>line</b> is a valid RecommendedPackages line.
*/
/*
The grammar is:
"package" SP PACKAGENAME SP VERSION SP URL SP DIGESTS NL
PACKAGENAME = NONSPACE
VERSION = NONSPACE
URL = NONSPACE
DIGESTS = DIGEST | DIGESTS SP DIGEST
DIGEST = DIGESTTYPE "=" DIGESTVAL
NONSPACE = one or more non-space printing characters
DIGESTVAL = DIGESTTYPE = one or more non-=, non-" " characters.
SP = " "
NL = a newline
*/
int
validate_recommended_package_line(const char *line)
{
const char *cp = line;
#define WORD() \
do { \
if (*cp == ' ') \
return 0; \
cp = strchr(cp, ' '); \
if (!cp) \
return 0; \
} while (0)
WORD(); /* skip packagename */
++cp;
WORD(); /* skip version */
++cp;
WORD(); /* Skip URL */
++cp;
/* Skip digesttype=digestval + */
int n_entries = 0;
while (1) {
const char *start_of_word = cp;
const char *end_of_word = strchr(cp, ' ');
if (! end_of_word)
end_of_word = cp + strlen(cp);
if (start_of_word == end_of_word)
return 0;
const char *eq = memchr(start_of_word, '=', end_of_word - start_of_word);
if (!eq)
return 0;
if (eq == start_of_word)
return 0;
if (eq == end_of_word - 1)
return 0;
if (memchr(eq+1, '=', end_of_word - (eq+1)))
return 0;
++n_entries;
if (0 == *end_of_word)
break;
cp = end_of_word + 1;
}
/* If we reach this point, we have at least 1 entry. */
tor_assert(n_entries > 0);
return 1;
}
|
