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
|
#include "libfilezilla/hostname_lookup.hpp"
#ifdef FZ_WINDOWS
#include "libfilezilla/glue/windows.hpp"
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mstcpip.h>
#endif
#include "libfilezilla/socket.hpp"
#include "libfilezilla/thread_pool.hpp"
#ifndef FZ_WINDOWS
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#endif
namespace fz {
class hostname_lookup::impl
{
public:
impl(hostname_lookup * parent, thread_pool& pool, event_handler* h)
: parent_(parent), pool_(pool), handler_(h)
{
}
bool spawn() {
if (!thread_) {
thread_ = pool_.spawn([this](){ entry(); });
}
return thread_.operator bool();
}
void entry();
void do_lookup(scoped_lock & l);
mutex mtx_{false};
hostname_lookup* parent_;
thread_pool & pool_;
event_handler* handler_{};
condition cond_;
async_task thread_;
std::string host_;
address_type family_{};
};
void hostname_lookup::impl::entry()
{
scoped_lock l(mtx_);
if (thread_) {
do {
cond_.wait(l);
do_lookup(l);
} while (thread_);
}
l.unlock();
delete this;
}
int convert_msw_error_code(int error);
void hostname_lookup::impl::do_lookup(scoped_lock& l)
{
if (host_.empty()) {
return;
}
l.unlock();
addrinfo hints{};
switch (family_) {
case address_type::ipv4:
hints.ai_family = AF_INET;
break;
case address_type::ipv6:
hints.ai_family = AF_INET6;
break;
default:
hints.ai_family = AF_UNSPEC;
break;
}
hints.ai_socktype = SOCK_STREAM;
#ifdef AI_IDN
hints.ai_flags |= AI_IDN;
#endif
addrinfo* addressList{};
int res = getaddrinfo(host_.c_str(), nullptr, &hints, &addressList);
l.lock();
if (!thread_) {
if (!res) {
freeaddrinfo(addressList);
}
return;
}
std::vector<std::string> addrs;
if (res) {
#ifdef FZ_WINDOWS
res = convert_msw_error_code(res);
#endif
}
else {
for (addrinfo* addr = addressList; addr && !res; addr = addr->ai_next) {
auto s = socket::address_to_string(addr->ai_addr, addr->ai_addrlen, false);
if (!s.empty()) {
addrs.emplace_back(std::move(s));
}
}
}
freeaddrinfo(addressList);
handler_->send_event<hostname_lookup_event>(parent_, res, std::move(addrs));
host_.clear();
}
hostname_lookup::hostname_lookup(thread_pool& pool, event_handler& evt_handler)
: impl_(new impl(this, pool, &evt_handler))
{
}
bool hostname_lookup::lookup(native_string const& host, address_type family)
{
if (host.empty()) {
return false;
}
scoped_lock l(impl_->mtx_);
if (!impl_->host_.empty()) {
return false;
}
if (!impl_->spawn()) {
return false;
}
impl_->host_ = fz::to_string(host);
impl_->family_ = family;
impl_->cond_.signal(l);
return true;
}
namespace {
void filter_hostname_events(fz::hostname_lookup* lookup, fz::event_handler* handler)
{
auto filter = [&](event_base const& ev) -> bool {
if (ev.derived_type() != hostname_lookup_event::type()) {
return false;
}
return std::get<0>(static_cast<hostname_lookup_event const&>(ev).v_) == lookup;
};
handler->filter_events(filter);
}
}
hostname_lookup::~hostname_lookup()
{
scoped_lock l(impl_->mtx_);
if (!impl_->thread_) {
l.unlock();
delete impl_;
}
else {
filter_hostname_events(this, impl_->handler_);
impl_->thread_.detach();
impl_->cond_.signal(l);
}
}
void hostname_lookup::reset()
{
scoped_lock l(impl_->mtx_);
if (!impl_->thread_) {
return;
}
filter_hostname_events(this, impl_->handler_);
if (!impl_->host_.empty()) {
impl_->thread_.detach();
impl_->cond_.signal(l);
impl_ = new impl(this, impl_->pool_, impl_->handler_);
}
}
}
|
