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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
|
/*=========================================================================*\
* Internet domain functions
* LuaSocket toolkit
*
* RCS ID: $Id$
\*=========================================================================*/
#include <stdio.h>
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include "luasocket.h"
#include "inet.h"
/*=========================================================================*\
* Internal function prototypes.
\*=========================================================================*/
static int inet_global_toip(lua_State *L);
static int inet_global_tohostname(lua_State *L);
static void inet_pushresolved(lua_State *L, struct hostent *hp);
static luaL_reg func[] = {
{ "toip", inet_global_toip },
{ "tohostname", inet_global_tohostname },
{ NULL, NULL}
};
/*=========================================================================*\
* Exported functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
void inet_open(lua_State *L)
{
luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
lua_pop(L, 1);
}
/*=========================================================================*\
* Global Lua functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Returns all information provided by the resolver given a host name
* or ip address
\*-------------------------------------------------------------------------*/
static int inet_global_toip(lua_State *L)
{
const char *address = luaL_checkstring(L, 1);
struct in_addr addr;
struct hostent *hp;
if (inet_aton(address, &addr))
hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
else
hp = gethostbyname(address);
if (!hp) {
lua_pushnil(L);
lua_pushstring(L, sock_hoststrerror());
return 2;
}
addr = *((struct in_addr *) hp->h_addr);
lua_pushstring(L, inet_ntoa(addr));
inet_pushresolved(L, hp);
return 2;
}
/*-------------------------------------------------------------------------*\
* Returns all information provided by the resolver given a host name
* or ip address
\*-------------------------------------------------------------------------*/
static int inet_global_tohostname(lua_State *L)
{
const char *address = luaL_checkstring(L, 1);
struct in_addr addr;
struct hostent *hp;
if (inet_aton(address, &addr))
hp = gethostbyaddr((char *) &addr, sizeof(addr), AF_INET);
else
hp = gethostbyname(address);
if (!hp) {
lua_pushnil(L);
lua_pushstring(L, sock_hoststrerror());
return 2;
}
lua_pushstring(L, hp->h_name);
inet_pushresolved(L, hp);
return 2;
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Retrieves socket peer name
\*-------------------------------------------------------------------------*/
int inet_meth_getpeername(lua_State *L, p_sock ps)
{
struct sockaddr_in peer;
socklen_t peer_len = sizeof(peer);
if (getpeername(*ps, (SA *) &peer, &peer_len) < 0) {
lua_pushnil(L);
return 1;
}
lua_pushstring(L, inet_ntoa(peer.sin_addr));
lua_pushnumber(L, ntohs(peer.sin_port));
return 2;
}
/*-------------------------------------------------------------------------*\
* Retrieves socket local name
\*-------------------------------------------------------------------------*/
int inet_meth_getsockname(lua_State *L, p_sock ps)
{
struct sockaddr_in local;
socklen_t local_len = sizeof(local);
if (getsockname(*ps, (SA *) &local, &local_len) < 0) {
lua_pushnil(L);
return 1;
}
lua_pushstring(L, inet_ntoa(local.sin_addr));
lua_pushnumber(L, ntohs(local.sin_port));
return 2;
}
/*=========================================================================*\
* Internal functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Passes all resolver information to Lua as a table
\*-------------------------------------------------------------------------*/
static void inet_pushresolved(lua_State *L, struct hostent *hp)
{
char **alias;
struct in_addr **addr;
int i, resolved;
lua_newtable(L); resolved = lua_gettop(L);
lua_pushstring(L, "name");
lua_pushstring(L, hp->h_name);
lua_settable(L, resolved);
lua_pushstring(L, "ip");
lua_pushstring(L, "alias");
i = 1;
alias = hp->h_aliases;
lua_newtable(L);
while (*alias) {
lua_pushnumber(L, i);
lua_pushstring(L, *alias);
lua_settable(L, -3);
i++; alias++;
}
lua_settable(L, resolved);
i = 1;
lua_newtable(L);
addr = (struct in_addr **) hp->h_addr_list;
while (*addr) {
lua_pushnumber(L, i);
lua_pushstring(L, inet_ntoa(**addr));
lua_settable(L, -3);
i++; addr++;
}
lua_settable(L, resolved);
}
/*-------------------------------------------------------------------------*\
* Tries to connect to remote address (address, port)
\*-------------------------------------------------------------------------*/
const char *inet_tryconnect(p_sock ps, const char *address,
unsigned short port)
{
struct sockaddr_in remote;
const char *err;
memset(&remote, 0, sizeof(remote));
remote.sin_family = AF_INET;
remote.sin_port = htons(port);
if (strcmp(address, "*")) {
if (!strlen(address) || !inet_aton(address, &remote.sin_addr)) {
struct hostent *hp = gethostbyname(address);
struct in_addr **addr;
if (!hp) return sock_hoststrerror();
addr = (struct in_addr **) hp->h_addr_list;
memcpy(&remote.sin_addr, *addr, sizeof(struct in_addr));
}
} else remote.sin_family = AF_UNSPEC;
sock_setblocking(ps);
err = sock_connect(ps, (SA *) &remote, sizeof(remote));
if (err) {
sock_destroy(ps);
*ps = SOCK_INVALID;
return err;
} else {
sock_setnonblocking(ps);
return NULL;
}
}
/*-------------------------------------------------------------------------*\
* Tries to bind socket to (address, port)
\*-------------------------------------------------------------------------*/
const char *inet_trybind(p_sock ps, const char *address, unsigned short port,
int backlog)
{
struct sockaddr_in local;
const char *err;
memset(&local, 0, sizeof(local));
/* address is either wildcard or a valid ip address */
local.sin_addr.s_addr = htonl(INADDR_ANY);
local.sin_port = htons(port);
local.sin_family = AF_INET;
if (strcmp(address, "*") &&
(!strlen(address) || !inet_aton(address, &local.sin_addr))) {
struct hostent *hp = gethostbyname(address);
struct in_addr **addr;
if (!hp) return sock_hoststrerror();
addr = (struct in_addr **) hp->h_addr_list;
memcpy(&local.sin_addr, *addr, sizeof(struct in_addr));
}
sock_setblocking(ps);
err = sock_bind(ps, (SA *) &local, sizeof(local));
if (err) {
sock_destroy(ps);
*ps = SOCK_INVALID;
return err;
} else {
sock_setnonblocking(ps);
if (backlog > 0) sock_listen(ps, backlog);
return NULL;
}
}
/*-------------------------------------------------------------------------*\
* Tries to create a new inet socket
\*-------------------------------------------------------------------------*/
const char *inet_trycreate(p_sock ps, int type)
{
return sock_create(ps, AF_INET, type, 0);
}
/*-------------------------------------------------------------------------*\
* Some systems do not provide this so that we provide our own. It's not
* marvelously fast, but it works just fine.
\*-------------------------------------------------------------------------*/
#ifdef INET_ATON
int inet_aton(const char *cp, struct in_addr *inp)
{
unsigned int a = 0, b = 0, c = 0, d = 0;
int n = 0, r;
unsigned long int addr = 0;
r = sscanf(cp, "%u.%u.%u.%u%n", &a, &b, &c, &d, &n);
if (r == 0 || n == 0) return 0;
cp += n;
if (*cp) return 0;
if (a > 255 || b > 255 || c > 255 || d > 255) return 0;
if (inp) {
addr += a; addr <<= 8;
addr += b; addr <<= 8;
addr += c; addr <<= 8;
addr += d;
inp->s_addr = htonl(addr);
}
return 1;
}
#endif
|
