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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
#include <network/dns_handler.hpp>
#include <network/resolver.hpp>
#include <string.h>
#include <arpa/inet.h>
#include <cstdlib>
using namespace std::string_literals;
Resolver::Resolver():
#ifdef CARES_FOUND
resolved4(false),
resolved6(false),
resolving(false),
cares_addrinfo(nullptr),
port{},
#endif
resolved(false),
error_msg{}
{
}
void Resolver::resolve(const std::string& hostname, const std::string& port,
SuccessCallbackType success_cb, ErrorCallbackType error_cb)
{
this->error_cb = error_cb;
this->success_cb = success_cb;
#ifdef CARES_FOUND
this->port = port;
#endif
this->start_resolving(hostname, port);
}
#ifdef CARES_FOUND
void Resolver::start_resolving(const std::string& hostname, const std::string&)
{
this->resolving = true;
this->resolved = false;
this->resolved4 = false;
this->resolved6 = false;
this->error_msg.clear();
this->cares_addrinfo = nullptr;
auto hostname4_resolved = [](void* arg, int status, int,
struct hostent* hostent)
{
Resolver* resolver = static_cast<Resolver*>(arg);
resolver->on_hostname4_resolved(status, hostent);
};
auto hostname6_resolved = [](void* arg, int status, int,
struct hostent* hostent)
{
Resolver* resolver = static_cast<Resolver*>(arg);
resolver->on_hostname6_resolved(status, hostent);
};
DNSHandler::instance.gethostbyname(hostname, hostname6_resolved,
this, AF_INET6);
DNSHandler::instance.gethostbyname(hostname, hostname4_resolved,
this, AF_INET);
}
void Resolver::on_hostname4_resolved(int status, struct hostent* hostent)
{
this->resolved4 = true;
if (status == ARES_SUCCESS)
this->fill_ares_addrinfo4(hostent);
else
this->error_msg = ::ares_strerror(status);
if (this->resolved4 && this->resolved6)
this->on_resolved();
}
void Resolver::on_hostname6_resolved(int status, struct hostent* hostent)
{
this->resolved6 = true;
if (status == ARES_SUCCESS)
this->fill_ares_addrinfo6(hostent);
else
this->error_msg = ::ares_strerror(status);
if (this->resolved4 && this->resolved6)
this->on_resolved();
}
void Resolver::on_resolved()
{
this->resolved = true;
this->resolving = false;
if (!this->cares_addrinfo)
{
if (this->error_cb)
this->error_cb(this->error_msg.data());
}
else
{
this->addr.reset(this->cares_addrinfo);
if (this->success_cb)
this->success_cb(this->addr.get());
}
}
void Resolver::fill_ares_addrinfo4(const struct hostent* hostent)
{
struct addrinfo* prev = this->cares_addrinfo;
struct in_addr** address = reinterpret_cast<struct in_addr**>(hostent->h_addr_list);
while (*address)
{
// Create a new addrinfo list element, and fill it
struct addrinfo* current = new struct addrinfo;
current->ai_flags = 0;
current->ai_family = hostent->h_addrtype;
current->ai_socktype = SOCK_STREAM;
current->ai_protocol = 0;
current->ai_addrlen = sizeof(struct sockaddr_in);
struct sockaddr_in* addr = new struct sockaddr_in;
addr->sin_family = hostent->h_addrtype;
addr->sin_port = htons(strtoul(this->port.data(), nullptr, 10));
addr->sin_addr.s_addr = (*address)->s_addr;
current->ai_addr = reinterpret_cast<struct sockaddr*>(addr);
current->ai_next = nullptr;
current->ai_canonname = nullptr;
current->ai_next = prev;
this->cares_addrinfo = current;
prev = current;
++address;
}
}
void Resolver::fill_ares_addrinfo6(const struct hostent* hostent)
{
struct addrinfo* prev = this->cares_addrinfo;
struct in6_addr** address = reinterpret_cast<struct in6_addr**>(hostent->h_addr_list);
while (*address)
{
// Create a new addrinfo list element, and fill it
struct addrinfo* current = new struct addrinfo;
current->ai_flags = 0;
current->ai_family = hostent->h_addrtype;
current->ai_socktype = SOCK_STREAM;
current->ai_protocol = 0;
current->ai_addrlen = sizeof(struct sockaddr_in6);
struct sockaddr_in6* addr = new struct sockaddr_in6;
addr->sin6_family = hostent->h_addrtype;
addr->sin6_port = htons(strtoul(this->port.data(), nullptr, 10));
::memcpy(addr->sin6_addr.s6_addr, (*address)->s6_addr, 16);
addr->sin6_flowinfo = 0;
addr->sin6_scope_id = 0;
current->ai_addr = reinterpret_cast<struct sockaddr*>(addr);
current->ai_canonname = nullptr;
current->ai_next = prev;
this->cares_addrinfo = current;
prev = current;
++address;
}
}
#else // ifdef CARES_FOUND
void Resolver::start_resolving(const std::string& hostname, const std::string& port)
{
// If the resolution fails, the addr will be unset
this->addr.reset(nullptr);
struct addrinfo hints;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_flags = 0;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
struct addrinfo* addr_res = nullptr;
const int res = ::getaddrinfo(hostname.data(), port.data(),
&hints, &addr_res);
this->resolved = true;
if (res != 0)
{
this->error_msg = gai_strerror(res);
if (this->error_cb)
this->error_cb(this->error_msg.data());
}
else
{
this->addr.reset(addr_res);
if (this->success_cb)
this->success_cb(this->addr.get());
}
}
#endif // ifdef CARES_FOUND
std::string addr_to_string(const struct addrinfo* rp)
{
char buf[INET6_ADDRSTRLEN];
if (rp->ai_family == AF_INET)
return ::inet_ntop(rp->ai_family,
&reinterpret_cast<sockaddr_in*>(rp->ai_addr)->sin_addr,
buf, sizeof(buf));
else if (rp->ai_family == AF_INET6)
return ::inet_ntop(rp->ai_family,
&reinterpret_cast<sockaddr_in6*>(rp->ai_addr)->sin6_addr,
buf, sizeof(buf));
return {};
}
|
