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
|
// CODYlib -*- mode:c++ -*-
// Copyright (C) 2020 Nathan Sidwell, nathan@acm.org
// License: Apache v2.0
// Cody
#include "internal.hh"
#if CODY_NETWORKING
// C
#include <cerrno>
#include <cstring>
// OS
#include <netdb.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/un.h>
#ifndef AI_NUMERICSERV
#define AI_NUMERICSERV 0
#endif
// Client-side networking helpers
namespace Cody {
int OpenSocket (char const **e, sockaddr const *addr, socklen_t len)
{
char const *errstr = nullptr;
int fd = socket (addr->sa_family, SOCK_STREAM, 0);
if (fd < 0)
{
errstr = "creating socket";
fail:;
int err = errno;
if (e)
*e = errstr;
if (fd >= 0)
close (fd);
errno = err;
return -1;
}
if (connect (fd, addr, len) < 0)
{
errstr = "connecting socket";
goto fail;
}
return fd;
}
int OpenLocal (char const **e, char const *name)
{
sockaddr_un addr;
size_t len = strlen (name);
if (len >= sizeof (addr.sun_path))
{
errno = ENAMETOOLONG;
return -1;
}
memset (&addr, 0, offsetof (sockaddr_un, sun_path));
addr.sun_family = AF_UNIX;
memcpy (addr.sun_path, name, len + 1);
return OpenSocket (e, (sockaddr *)&addr, sizeof (addr));
}
int OpenInet6 (char const **e, char const *name, int port)
{
addrinfo *addrs = nullptr;
int fd = -1;
char const *errstr = nullptr;
fd = socket (AF_INET6, SOCK_STREAM, 0);
if (fd < 0)
{
errstr = "socket";
fail:;
int err = errno;
if (e)
*e = errstr;
if (fd >= 0)
close (fd);
if (addrs)
freeaddrinfo (addrs);
errno = err;
return -1;
}
addrinfo hints;
hints.ai_flags = 0;
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
hints.ai_addrlen = 0;
hints.ai_addr = nullptr;
hints.ai_canonname = nullptr;
hints.ai_next = nullptr;
if (int err = getaddrinfo (name, nullptr, &hints, &addrs))
{
errstr = gai_strerror (err);
// What's the best errno to set?
errno = 0;
goto fail;
}
sockaddr_in6 addr;
memset (&addr, 0, sizeof (addr));
addr.sin6_family = AF_INET6;
for (struct addrinfo *next = addrs; next; next = next->ai_next)
if (next->ai_family == AF_INET6
&& next->ai_socktype == SOCK_STREAM)
{
sockaddr_in6 *in6 = (sockaddr_in6 *)next->ai_addr;
in6->sin6_port = htons (port);
if (ntohs (in6->sin6_port) != port)
errno = EINVAL;
else if (!connect (fd, next->ai_addr, next->ai_addrlen))
goto done;
}
errstr = "connecting";
goto fail;
done:;
freeaddrinfo (addrs);
return fd;
}
}
#endif
|
