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
|
/*
* Copyright 2007-2018 Content Management AG
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Resolver.hxx"
#include "AddressInfo.hxx"
#include "HostParser.hxx"
#include "util/RuntimeError.hxx"
#include "util/CharUtil.hxx"
#ifdef _WIN32
#include <ws2tcpip.h>
#else
#include <sys/socket.h>
#include <netdb.h>
#include <net/if.h>
#endif
#include <string.h>
#include <stdio.h>
#include <errno.h>
static inline bool
ai_is_passive(const struct addrinfo *ai)
{
return ai == nullptr || (ai->ai_flags & AI_PASSIVE) != 0;
}
#ifndef _WIN32
/**
* Check if there is an interface name after '%', and if so, replace
* it with the interface index, because getaddrinfo() understands only
* the index, not the name (tested on Linux/glibc).
*/
static void
FindAndResolveInterfaceName(char *host, size_t size)
{
char *percent = strchr(host, '%');
if (percent == nullptr || percent + 64 > host + size)
return;
char *interface = percent + 1;
if (!IsAlphaASCII(*interface))
return;
const unsigned i = if_nametoindex(interface);
if (i == 0)
throw FormatRuntimeError("No such interface: %s", interface);
sprintf(interface, "%u", i);
}
#endif
static int
Resolve(const char *host_and_port, int default_port,
const struct addrinfo *hints,
struct addrinfo **ai_r)
{
const char *host, *port;
char buffer[256], port_string[16];
if (host_and_port != nullptr) {
const auto eh = ExtractHost(host_and_port);
if (eh.HasFailed())
return EAI_NONAME;
if (eh.host.size >= sizeof(buffer)) {
#ifdef _WIN32
return EAI_MEMORY;
#else
errno = ENAMETOOLONG;
return EAI_SYSTEM;
#endif
}
memcpy(buffer, eh.host.data, eh.host.size);
buffer[eh.host.size] = 0;
host = buffer;
#ifndef _WIN32
FindAndResolveInterfaceName(buffer, sizeof(buffer));
#endif
port = eh.end;
if (*port == ':') {
/* port specified */
++port;
} else if (*port == 0) {
/* no port specified */
snprintf(port_string, sizeof(port_string), "%d", default_port);
port = port_string;
} else
throw std::runtime_error("Garbage after host name");
if (ai_is_passive(hints) && strcmp(host, "*") == 0)
host = nullptr;
} else {
host = nullptr;
snprintf(port_string, sizeof(port_string), "%d", default_port);
port = port_string;
}
return getaddrinfo(host, port, hints, ai_r);
}
AddressInfoList
Resolve(const char *host_and_port, int default_port,
const struct addrinfo *hints)
{
struct addrinfo *ai;
int result = Resolve(host_and_port, default_port, hints, &ai);
if (result != 0)
throw FormatRuntimeError("Failed to resolve '%s': %s",
host_and_port, gai_strerror(result));
return AddressInfoList(ai);
}
AddressInfoList
Resolve(const char *host_port, unsigned default_port, int flags, int socktype)
{
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = flags;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = socktype;
return Resolve(host_port, default_port, &hints);
}
|
