-
Notifications
You must be signed in to change notification settings - Fork 15
/
hostname.h
175 lines (144 loc) · 4.63 KB
/
hostname.h
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
// Copyright (c) 2012, Robert Escriva
// All rights reserved.
//
// 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.
// * Neither the name of po6 nor the names of its contributors may be used
// to endorse or promote products derived from this software without
// specific prior written permission.
//
// 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 COPYRIGHT OWNER 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.
#ifndef po6_net_hostname_h_
#define po6_net_hostname_h_
// C
#include <cstdio>
// POSIX
#include <netdb.h>
// po6
#include <po6/net/location.h>
#include <po6/net/socket.h>
namespace po6
{
namespace net
{
class hostname
{
public:
hostname();
explicit hostname(const char* _address, in_port_t _port);
hostname(const hostname& other);
~hostname() throw ();
public:
location connect(int domain, int type, int protocol, po6::net::socket* sock) const;
public:
bool operator < (const hostname& rhs) const { return compare(rhs) < 0; }
bool operator <= (const hostname& rhs) const { return compare(rhs) <= 0; }
bool operator == (const hostname& rhs) const { return compare(rhs) == 0; }
bool operator != (const hostname& rhs) const { return compare(rhs) != 0; }
bool operator >= (const hostname& rhs) const { return compare(rhs) >= 0; }
bool operator > (const hostname& rhs) const { return compare(rhs) > 0; }
public:
std::string address;
in_port_t port;
private:
class protect_addrinfo;
private:
int compare(const hostname& rhs) const;
};
class hostname::protect_addrinfo
{
public:
protect_addrinfo(addrinfo* ai) : m_ai(ai) {}
~protect_addrinfo() throw () { if (m_ai) { freeaddrinfo(m_ai); } }
private:
addrinfo* m_ai;
};
inline
hostname :: hostname()
: address()
, port()
{
}
inline
hostname :: hostname(const char* _hostname, in_port_t _port)
: address(_hostname)
, port(_port)
{
}
inline
hostname :: hostname(const hostname& other)
: address(other.address)
, port(other.port)
{
}
inline
hostname :: ~hostname() throw ()
{
}
inline po6::net::location
hostname :: connect(int domain, int type, int protocol, po6::net::socket* sock) const
{
// Convert the port to a C string
char port_cstr[6];
snprintf(port_cstr, 6, "%u", port);
// Setup the hints
addrinfo hints;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
hints.ai_family = domain;
hints.ai_socktype = type;
hints.ai_protocol = protocol;
// Make the call
addrinfo* res = NULL;
int gai_err = getaddrinfo(address.c_str(), port_cstr, &hints, &res);
if (gai_err)
{
throw po6::error(gai_err, gai_strerror(gai_err));
}
protect_addrinfo pai(res);
location loc;
for (addrinfo* ai = res; ai; ai = ai->ai_next)
{
if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
{
errno = ECONNREFUSED;
continue;
}
sock->reset(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock->get() < 0)
{
continue;
}
if (::connect(sock->get(), ai->ai_addr, ai->ai_addrlen) < 0)
{
sock->close();
continue;
}
loc = location(ai->ai_addr, ai->ai_addrlen);
break;
}
if (sock->get() < 0)
{
throw po6::error(errno);
}
return loc;
}
} // namespace net
} // namespace po6
#endif // po6_net_hostname_h_