DomainSocket.cpp
4.77 KB
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
//===-- DomainSocket.cpp ----------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/posix/DomainSocket.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/FileSystem.h"
#include <stddef.h>
#include <sys/socket.h>
#include <sys/un.h>
using namespace lldb;
using namespace lldb_private;
#ifdef __ANDROID__
// Android does not have SUN_LEN
#ifndef SUN_LEN
#define SUN_LEN(ptr) \
(offsetof(struct sockaddr_un, sun_path) + strlen((ptr)->sun_path))
#endif
#endif // #ifdef __ANDROID__
namespace {
const int kDomain = AF_UNIX;
const int kType = SOCK_STREAM;
bool SetSockAddr(llvm::StringRef name, const size_t name_offset,
sockaddr_un *saddr_un, socklen_t &saddr_un_len) {
if (name.size() + name_offset > sizeof(saddr_un->sun_path))
return false;
memset(saddr_un, 0, sizeof(*saddr_un));
saddr_un->sun_family = kDomain;
memcpy(saddr_un->sun_path + name_offset, name.data(), name.size());
// For domain sockets we can use SUN_LEN in order to calculate size of
// sockaddr_un, but for abstract sockets we have to calculate size manually
// because of leading null symbol.
if (name_offset == 0)
saddr_un_len = SUN_LEN(saddr_un);
else
saddr_un_len =
offsetof(struct sockaddr_un, sun_path) + name_offset + name.size();
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__)
saddr_un->sun_len = saddr_un_len;
#endif
return true;
}
} // namespace
DomainSocket::DomainSocket(bool should_close, bool child_processes_inherit)
: Socket(ProtocolUnixDomain, should_close, child_processes_inherit) {}
DomainSocket::DomainSocket(SocketProtocol protocol,
bool child_processes_inherit)
: Socket(protocol, true, child_processes_inherit) {}
DomainSocket::DomainSocket(NativeSocket socket,
const DomainSocket &listen_socket)
: Socket(ProtocolUnixDomain, listen_socket.m_should_close_fd,
listen_socket.m_child_processes_inherit) {
m_socket = socket;
}
Status DomainSocket::Connect(llvm::StringRef name) {
sockaddr_un saddr_un;
socklen_t saddr_un_len;
if (!SetSockAddr(name, GetNameOffset(), &saddr_un, saddr_un_len))
return Status("Failed to set socket address");
Status error;
m_socket = CreateSocket(kDomain, kType, 0, m_child_processes_inherit, error);
if (error.Fail())
return error;
if (llvm::sys::RetryAfterSignal(-1, ::connect, GetNativeSocket(),
(struct sockaddr *)&saddr_un, saddr_un_len) < 0)
SetLastError(error);
return error;
}
Status DomainSocket::Listen(llvm::StringRef name, int backlog) {
sockaddr_un saddr_un;
socklen_t saddr_un_len;
if (!SetSockAddr(name, GetNameOffset(), &saddr_un, saddr_un_len))
return Status("Failed to set socket address");
DeleteSocketFile(name);
Status error;
m_socket = CreateSocket(kDomain, kType, 0, m_child_processes_inherit, error);
if (error.Fail())
return error;
if (::bind(GetNativeSocket(), (struct sockaddr *)&saddr_un, saddr_un_len) ==
0)
if (::listen(GetNativeSocket(), backlog) == 0)
return error;
SetLastError(error);
return error;
}
Status DomainSocket::Accept(Socket *&socket) {
Status error;
auto conn_fd = AcceptSocket(GetNativeSocket(), nullptr, nullptr,
m_child_processes_inherit, error);
if (error.Success())
socket = new DomainSocket(conn_fd, *this);
return error;
}
size_t DomainSocket::GetNameOffset() const { return 0; }
void DomainSocket::DeleteSocketFile(llvm::StringRef name) {
llvm::sys::fs::remove(name);
}
std::string DomainSocket::GetSocketName() const {
if (m_socket != kInvalidSocketValue) {
struct sockaddr_un saddr_un;
saddr_un.sun_family = AF_UNIX;
socklen_t sock_addr_len = sizeof(struct sockaddr_un);
if (::getpeername(m_socket, (struct sockaddr *)&saddr_un, &sock_addr_len) ==
0) {
std::string name(saddr_un.sun_path + GetNameOffset(),
sock_addr_len -
offsetof(struct sockaddr_un, sun_path) -
GetNameOffset());
if (name.back() == '\0') name.pop_back();
return name;
}
}
return "";
}
std::string DomainSocket::GetRemoteConnectionURI() const {
if (m_socket != kInvalidSocketValue) {
return llvm::formatv("{0}://{1}",
GetNameOffset() == 0 ? "unix-connect"
: "unix-abstract-connect",
GetSocketName());
}
return "";
}