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
|
/*
This file is part of TALER
Copyright (C) 2014-2020 Taler Systems SA
TALER 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, or (at your option) any later version.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file mhd.c
* @brief MHD utility functions (used by the merchant backend)
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_util.h"
/**
* Find out if an MHD connection is using HTTPS (either
* directly or via proxy).
*
* @param connection MHD connection
* @returns #GNUNET_YES if the MHD connection is using https,
* #GNUNET_NO if the MHD connection is using http,
* #GNUNET_SYSERR if the connection type couldn't be determined
*/
enum GNUNET_GenericReturnValue
TALER_mhd_is_https (struct MHD_Connection *connection)
{
const union MHD_ConnectionInfo *ci;
const union MHD_DaemonInfo *di;
const char *forwarded_proto = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Proto");
if (NULL != forwarded_proto)
{
if (0 == strcmp (forwarded_proto,
"https"))
return GNUNET_YES;
if (0 == strcmp (forwarded_proto,
"http"))
return GNUNET_NO;
GNUNET_break (0);
return GNUNET_SYSERR;
}
/* likely not reverse proxy, figure out if we are
http by asking MHD */
ci = MHD_get_connection_info (connection,
MHD_CONNECTION_INFO_DAEMON);
if (NULL == ci)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
di = MHD_get_daemon_info (ci->daemon,
MHD_DAEMON_INFO_FLAGS);
if (NULL == di)
{
GNUNET_break (0);
return GNUNET_SYSERR;
}
if (0 != (di->flags & MHD_USE_TLS))
return GNUNET_YES;
return GNUNET_NO;
}
/**
* Make an absolute URL for a given MHD connection.
*
* @param connection the connection to get the URL for
* @param path path of the url
* @param ... NULL-terminated key-value pairs (char *) for query parameters,
* the value will be url-encoded
* @returns the URL, must be freed with #GNUNET_free
*/
char *
TALER_url_absolute_mhd (struct MHD_Connection *connection,
const char *path,
...)
{
/* By default we assume we're running under HTTPS */
const char *proto;
const char *host;
const char *forwarded_host;
const char *prefix;
va_list args;
char *result;
if (GNUNET_YES == TALER_mhd_is_https (connection))
proto = "https";
else
proto = "http";
host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"Host");
forwarded_host = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Host");
prefix = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
"X-Forwarded-Prefix");
if (NULL == prefix)
prefix = "";
if (NULL != forwarded_host)
host = forwarded_host;
if (NULL == host)
{
/* Should never happen, at last the host header should be defined */
GNUNET_break (0);
return NULL;
}
va_start (args,
path);
result = TALER_url_absolute_raw_va (proto,
host,
prefix,
path,
args);
va_end (args);
return result;
}
|
