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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* http.c: HTTP service detection plugin
*
* Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "config.h"
#include "../liberty/liberty.c"
#include "../plugin-api.h"
#include "../http-parser/http_parser.h"
// --- Service detection -------------------------------------------------------
static struct plugin_data
{
void *ctx; ///< Application context
struct plugin_api *api; ///< Plugin API vtable
}
g_data;
enum header_state
{
STATE_FIELD, ///< We've been parsing a field so far
STATE_VALUE ///< We've been parsing a value so far
};
struct scan_data
{
struct unit *u; ///< Scan unit
http_parser parser; ///< HTTP parser
enum header_state state; ///< What did we get last time?
struct str field; ///< Field part buffer
struct str value; ///< Value part buffer
};
static void
on_header_read (struct scan_data *scan)
{
if (!strcasecmp (scan->field.str, "Server"))
{
char *info = xstrdup_printf ("%s: %s",
"server software", scan->value.str);
g_data.api->unit_add_info (scan->u, info);
free (info);
}
}
static int
on_header_field (http_parser *parser, const char *at, size_t len)
{
struct scan_data *scan = parser->data;
if (scan->state == STATE_VALUE)
{
on_header_read (scan);
str_reset (&scan->field);
str_reset (&scan->value);
}
str_append_data (&scan->field, at, len);
scan->state = STATE_FIELD;
return 0;
}
static int
on_header_value (http_parser *parser, const char *at, size_t len)
{
struct scan_data *data = parser->data;
str_append_data (&data->value, at, len);
data->state = STATE_VALUE;
return 0;
}
static int
on_headers_complete (http_parser *parser)
{
struct scan_data *scan = parser->data;
// We've got this far, this must be an HTTP server
g_data.api->unit_set_success (scan->u, true);
g_data.api->unit_abort (scan->u);
return 1;
}
static void *
scan_init (struct service *service, struct unit *u)
{
(void) service;
struct str hello;
str_init (&hello);
str_append_printf (&hello, "GET / HTTP/1.0\r\n"
"Host: %s\r\n\r\n", g_data.api->unit_get_address (u));
g_data.api->unit_write (u, hello.str, hello.len);
str_free (&hello);
struct scan_data *scan = xcalloc (1, sizeof *scan);
http_parser_init (&scan->parser, HTTP_RESPONSE);
scan->parser.data = scan;
scan->state = STATE_FIELD;
str_init (&scan->field);
str_init (&scan->value);
scan->u = u;
return scan;
}
static void
scan_free (void *handle)
{
struct scan_data *scan = handle;
str_free (&scan->field);
str_free (&scan->value);
free (scan);
}
static void
on_data (void *handle, const void *data, size_t len)
{
static const http_parser_settings http_settings =
{
.on_header_field = on_header_field,
.on_header_value = on_header_value,
.on_headers_complete = on_headers_complete,
};
struct scan_data *scan = handle;
http_parser *parser = &scan->parser;
size_t n_parsed = http_parser_execute (parser, &http_settings, data, len);
if (parser->upgrade)
{
// We should never get here though because `on_headers_complete'
// is called first and ends up aborting the unit.
g_data.api->unit_add_info (scan->u, "upgrades to a different protocol");
g_data.api->unit_abort (scan->u);
}
else if (n_parsed != len && parser->http_errno != HPE_CB_headers_complete)
g_data.api->unit_abort (scan->u);
}
static void
on_eof (void *handle)
{
on_data (handle, NULL, 0);
}
static struct service g_http_service =
{
.name = "HTTP",
.flags = SERVICE_SUPPORTS_TLS,
.scan_init = scan_init,
.scan_free = scan_free,
.on_data = on_data,
.on_eof = on_eof,
.on_error = NULL,
.on_aborted = NULL
};
static bool
initialize (void *ctx, struct plugin_api *api)
{
g_data = (struct plugin_data) { .ctx = ctx, .api = api };
api->register_service (ctx, &g_http_service);
return true;
}
struct plugin_info ponymap_plugin_info =
{
.api_version = API_VERSION,
.initialize = initialize
};
|
