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
|
/* Prosody IM
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
-- Copyright (C) 2012 Paul Aurich
-- Copyright (C) 2013 Matthew Wild
-- Copyright (C) 2013 Florian Zeitz
--
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stddef.h>
#include <string.h>
#include <errno.h>
#ifndef _WIN32
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#endif
#include <lua.h>
#include <lauxlib.h>
#if (LUA_VERSION_NUM < 504)
#define luaL_pushfail lua_pushnil
#endif
/* Enumerate all locally configured IP addresses */
static const char *const type_strings[] = {
"both",
"ipv4",
"ipv6",
NULL
};
static int lc_local_addresses(lua_State *L) {
#ifndef _WIN32
/* Link-local IPv4 addresses; see RFC 3927 and RFC 5735 */
const uint32_t ip4_linklocal = htonl(0xa9fe0000); /* 169.254.0.0 */
const uint32_t ip4_mask = htonl(0xffff0000);
struct ifaddrs *addr = NULL, *a;
#endif
int n = 1;
int type = luaL_checkoption(L, 1, "both", type_strings);
const char link_local = lua_toboolean(L, 2); /* defaults to 0 (false) */
const char ipv4 = (type == 0 || type == 1);
const char ipv6 = (type == 0 || type == 2);
#ifndef _WIN32
if(getifaddrs(&addr) < 0) {
luaL_pushfail(L);
lua_pushfstring(L, "getifaddrs failed (%d): %s", errno,
strerror(errno));
return 2;
}
#endif
lua_newtable(L);
#ifndef _WIN32
for(a = addr; a; a = a->ifa_next) {
int family;
char ipaddr[INET6_ADDRSTRLEN];
const char *tmp = NULL;
if(a->ifa_addr == NULL || a->ifa_flags & IFF_LOOPBACK) {
continue;
}
family = a->ifa_addr->sa_family;
if(ipv4 && family == AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *)a->ifa_addr;
if(!link_local && ((sa->sin_addr.s_addr & ip4_mask) == ip4_linklocal)) {
continue;
}
tmp = inet_ntop(family, &sa->sin_addr, ipaddr, sizeof(ipaddr));
} else if(ipv6 && family == AF_INET6) {
struct sockaddr_in6 *sa = (struct sockaddr_in6 *)a->ifa_addr;
if(!link_local && IN6_IS_ADDR_LINKLOCAL(&sa->sin6_addr)) {
continue;
}
if(IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr) || IN6_IS_ADDR_V4COMPAT(&sa->sin6_addr)) {
continue;
}
tmp = inet_ntop(family, &sa->sin6_addr, ipaddr, sizeof(ipaddr));
}
if(tmp != NULL) {
lua_pushstring(L, tmp);
lua_rawseti(L, -2, n++);
}
/* TODO: Error reporting? */
}
freeifaddrs(addr);
#else
if(ipv4) {
lua_pushstring(L, "0.0.0.0");
lua_rawseti(L, -2, n++);
}
if(ipv6) {
lua_pushstring(L, "::");
lua_rawseti(L, -2, n++);
}
#endif
return 1;
}
static int lc_pton(lua_State *L) {
char buf[16];
const char *ipaddr = luaL_checkstring(L, 1);
int errno_ = 0;
int family = strchr(ipaddr, ':') ? AF_INET6 : AF_INET;
switch(inet_pton(family, ipaddr, &buf)) {
case 1:
lua_pushlstring(L, buf, family == AF_INET6 ? 16 : 4);
return 1;
case -1:
errno_ = errno;
luaL_pushfail(L);
lua_pushstring(L, strerror(errno_));
lua_pushinteger(L, errno_);
return 3;
default:
case 0:
luaL_pushfail(L);
lua_pushstring(L, strerror(EINVAL));
lua_pushinteger(L, EINVAL);
return 3;
}
}
static int lc_ntop(lua_State *L) {
char buf[INET6_ADDRSTRLEN];
int family;
int errno_;
size_t l;
const char *ipaddr = luaL_checklstring(L, 1, &l);
if(l == 16) {
family = AF_INET6;
}
else if(l == 4) {
family = AF_INET;
}
else {
luaL_pushfail(L);
lua_pushstring(L, strerror(EAFNOSUPPORT));
lua_pushinteger(L, EAFNOSUPPORT);
return 3;
}
if(!inet_ntop(family, ipaddr, buf, INET6_ADDRSTRLEN))
{
errno_ = errno;
luaL_pushfail(L);
lua_pushstring(L, strerror(errno_));
lua_pushinteger(L, errno_);
return 3;
}
lua_pushstring(L, (const char *)(&buf));
return 1;
}
int luaopen_util_net(lua_State *L) {
luaL_checkversion(L);
luaL_Reg exports[] = {
{ "local_addresses", lc_local_addresses },
{ "pton", lc_pton },
{ "ntop", lc_ntop },
{ NULL, NULL }
};
lua_createtable(L, 0, 1);
luaL_setfuncs(L, exports, 0);
return 1;
}
|
