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
|
#include <sys/cdefs.h>
#include "namespace.h"
#include <lib.h>
#ifdef __weak_alias
__weak_alias(socket, __socket30)
#endif
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/ioc_net.h>
#include <net/hton.h>
#include <net/gen/in.h>
#include <net/gen/ether.h>
#include <net/gen/eth_hdr.h>
#include <net/gen/eth_io.h>
#include <net/gen/ip_hdr.h>
#include <net/gen/ip_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_hdr.h>
#include <net/gen/udp_io.h>
#include <net/gen/dhcp.h>
#include <net/netlib.h>
#include <netinet/in.h>
#define DEBUG 0
static int _tcp_socket(int type, int protocol);
static int _udp_socket(int type, int protocol);
static int _uds_socket(int type, int protocol);
static int _raw_socket(int type, int protocol);
static void _socket_flags(int type, int *result);
/*
* Create a socket.
*/
static int
__socket(int domain, int type, int protocol)
{
message m;
memset(&m, 0, sizeof(m));
m.m_lc_vfs_socket.domain = domain;
m.m_lc_vfs_socket.type = type;
m.m_lc_vfs_socket.protocol = protocol;
return _syscall(VFS_PROC_NR, VFS_SOCKET, &m);
}
int socket(int domain, int type, int protocol)
{
int r, sock_type;
r = __socket(domain, type, protocol);
if (r != -1 || (errno != EAFNOSUPPORT && errno != ENOSYS))
return r;
sock_type = type & ~SOCK_FLAGS_MASK;
#if DEBUG
fprintf(stderr, "socket: domain %d, type %d, protocol %d\n",
domain, type, protocol);
#endif
if (domain == AF_UNIX)
return _uds_socket(type, protocol);
if (domain == AF_INET) {
switch (sock_type) {
case SOCK_STREAM:
return _tcp_socket(type, protocol);
case SOCK_DGRAM:
return _udp_socket(type, protocol);
case SOCK_RAW:
return _raw_socket(type, protocol);
default:
errno = EPROTOTYPE;
return -1;
}
}
errno = EAFNOSUPPORT;
return -1;
}
static void
_socket_flags(int type, int *result)
{
/* Process socket flags */
if (type & SOCK_CLOEXEC) {
*result |= O_CLOEXEC;
}
if (type & SOCK_NONBLOCK) {
*result |= O_NONBLOCK;
}
if (type & SOCK_NOSIGPIPE) {
*result |= O_NOSIGPIPE;
}
}
static int _tcp_socket(int type, int protocol)
{
int flags = O_RDWR;
if (protocol != 0 && protocol != IPPROTO_TCP)
{
#if DEBUG
fprintf(stderr, "socket(tcp): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
_socket_flags(type, &flags);
return open(TCP_DEVICE, flags);
}
static int _udp_socket(int type, int protocol)
{
int r, fd, t_errno, flags = O_RDWR;
struct sockaddr_in sin;
if (protocol != 0 && protocol != IPPROTO_UDP)
{
#if DEBUG
fprintf(stderr, "socket(udp): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
_socket_flags(type, &flags);
fd= open(UDP_DEVICE, flags);
if (fd == -1)
return fd;
/* Bind is implict for UDP sockets? */
sin.sin_family= AF_INET;
sin.sin_addr.s_addr= INADDR_ANY;
sin.sin_port= 0;
r= bind(fd, (struct sockaddr *)&sin, sizeof(sin));
if (r != 0)
{
t_errno= errno;
close(fd);
errno= t_errno;
return -1;
}
return fd;
}
static int _raw_socket(int type, int protocol)
{
int fd, flags = O_RDWR;
nwio_ipopt_t ipopt;
int result;
if (protocol != IPPROTO_ICMP && protocol != IPPROTO_UDP && protocol != 0)
{
#if DEBUG
fprintf(stderr, "socket(icmp): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
_socket_flags(type, &flags);
fd= open(IP_DEVICE, flags);
if (fd == -1)
return fd;
memset(&ipopt, 0, sizeof(ipopt));
ipopt.nwio_flags= NWIO_COPY;
if(protocol) {
ipopt.nwio_flags |= NWIO_PROTOSPEC;
ipopt.nwio_proto = protocol;
}
result = ioctl (fd, NWIOSIPOPT, &ipopt);
if (result<0) {
close(fd);
return -1;
}
result = ioctl (fd, NWIOGIPOPT, &ipopt);
if (result<0) {
close(fd);
return -1;
}
return fd;
}
static int _uds_socket(int type, int protocol)
{
int fd, r, flags = O_RDWR, sock_type;
sock_type = type & ~SOCK_FLAGS_MASK;
if (sock_type != SOCK_STREAM &&
sock_type != SOCK_DGRAM &&
sock_type != SOCK_SEQPACKET) {
errno = EPROTOTYPE;
return -1;
}
if (protocol != 0)
{
#if DEBUG
fprintf(stderr, "socket(uds): bad protocol %d\n", protocol);
#endif
errno= EPROTONOSUPPORT;
return -1;
}
_socket_flags(type, &flags);
fd= open(UDS_DEVICE, flags);
if (fd == -1) {
return fd;
}
/* set the type for the socket via ioctl (SOCK_DGRAM,
* SOCK_STREAM, SOCK_SEQPACKET, etc)
*/
r= ioctl(fd, NWIOSUDSTYPE, &sock_type);
if (r == -1) {
int ioctl_errno;
/* if that failed rollback socket creation */
ioctl_errno= errno;
close(fd);
/* return the error thrown by the call to ioctl */
errno= ioctl_errno;
return -1;
}
return fd;
}
|
