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
|
/*
* nixio - Linux I/O library for lua
*
* Copyright (C) 2009 Steven Barth <steven@midlink.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "nixio.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
/**
* send() / sendto() helper
*/
static int nixio_sock__sendto(lua_State *L, int to) {
nixio_sock *sock = nixio__checksock(L);
struct sockaddr_storage addr_in;
#ifndef __WINNT__
struct sockaddr_un addr_un;
#endif
struct sockaddr *addr = NULL;
socklen_t alen = 0;
int argoff = 2;
if (to) {
argoff += 2;
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
const char *address = luaL_checkstring(L, 3);
addr = (struct sockaddr*)&addr_in;
alen = sizeof(addr_in);
nixio_addr naddr;
memset(&naddr, 0, sizeof(naddr));
strncpy(naddr.host, address, sizeof(naddr.host) - 1);
naddr.port = (uint16_t)luaL_checkinteger(L, 4);
naddr.family = sock->domain;
if (nixio__addr_write(&naddr, addr)) {
return nixio__perror_s(L);
}
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX) {
size_t pathlen;
const char *path = luaL_checklstring(L, 3, &pathlen);
addr_un.sun_family = AF_UNIX;
luaL_argcheck(L, pathlen <= sizeof(addr_un.sun_path), 3, "out of range");
memcpy(addr_un.sun_path, path, pathlen);
addr = (struct sockaddr*)&addr_un;
alen = sizeof(sa_family_t) + pathlen;
}
#endif
}
size_t len;
ssize_t sent;
const char *data = luaL_checklstring(L, 2, &len);
if (lua_gettop(L) > argoff) {
int offset = luaL_optint(L, argoff + 1, 0);
if (offset) {
if (offset < len) {
data += offset;
len -= offset;
} else {
len = 0;
}
}
unsigned int wlen = luaL_optint(L, argoff + 2, len);
if (wlen < len) {
len = wlen;
}
}
do {
sent = sendto(sock->fd, data, len, 0, addr, alen);
} while(sent == -1 && errno == EINTR);
if (sent >= 0) {
lua_pushinteger(L, sent);
return 1;
} else {
return nixio__perror_s(L);
}
}
/**
* send(data)
*/
static int nixio_sock_send(lua_State *L) {
return nixio_sock__sendto(L, 0);
}
/**
* sendto(data, address, port)
*/
static int nixio_sock_sendto(lua_State *L) {
return nixio_sock__sendto(L, 1);
}
/**
* recv() / recvfrom() helper
*/
static int nixio_sock__recvfrom(lua_State *L, int from) {
nixio_sock *sock = nixio__checksock(L);
char buffer[NIXIO_BUFFERSIZE];
struct sockaddr_storage addr_in;
#ifndef __WINNT__
struct sockaddr_un addr_un;
#endif
struct sockaddr *addr = NULL;
socklen_t alen = 0;
uint req = luaL_checkinteger(L, 2);
int readc;
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
addr = (from) ? (struct sockaddr*)&addr_in : NULL;
alen = (from) ? sizeof(addr_in) : 0;
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX) {
addr = (from) ? (struct sockaddr*)&addr_un : NULL;
alen = (from) ? sizeof(addr_un) : 0;
}
#endif
/* We limit the readsize to NIXIO_BUFFERSIZE */
req = (req > NIXIO_BUFFERSIZE) ? NIXIO_BUFFERSIZE : req;
do {
readc = recvfrom(sock->fd, buffer, req, 0, addr, &alen);
} while (readc == -1 && errno == EINTR);
#ifdef __WINNT__
if (readc < 0) {
int e = WSAGetLastError();
if (e == WSAECONNRESET || e == WSAECONNABORTED || e == WSAESHUTDOWN) {
readc = 0;
}
}
#endif
if (readc < 0) {
return nixio__perror_s(L);
} else {
lua_pushlstring(L, buffer, readc);
if (!from) {
return 1;
}
/* push address. */
if (sock->domain == AF_INET || sock->domain == AF_INET6) {
nixio_addr naddr;
if (!nixio__addr_parse(&naddr, (struct sockaddr *)&addr_in)) {
lua_pushstring(L, naddr.host);
lua_pushinteger(L, naddr.port);
return 3;
} else {
return 1;
}
}
#ifndef __WINNT__
else if (sock->domain == AF_UNIX && alen > sizeof(sa_family_t)) {
/* if first char is non-null then the path is not in the
abstract namespace and alen includes the trailing null */
if (addr_un.sun_path[0])
--alen;
lua_pushlstring(L, addr_un.sun_path, alen - sizeof(sa_family_t));
return 2;
}
#endif
}
return 1;
}
/**
* recv(count)
*/
static int nixio_sock_recv(lua_State *L) {
return nixio_sock__recvfrom(L, 0);
}
/**
* recvfrom(count)
*/
static int nixio_sock_recvfrom(lua_State *L) {
return nixio_sock__recvfrom(L, 1);
}
/* module table */
static const luaL_reg M[] = {
{"send", nixio_sock_send},
{"sendto", nixio_sock_sendto},
{"recv", nixio_sock_recv},
{"recvfrom",nixio_sock_recvfrom},
{"write", nixio_sock_send},
{"read", nixio_sock_recv},
{NULL, NULL}
};
void nixio_open_io(lua_State *L) {
lua_pushvalue(L, -2);
luaL_register(L, NULL, M);
lua_pop(L, 1);
}
|
