blob: e22c1c22612f21cdce60467a9cd341a00e87ed14 (
plain)
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
|
/*
* inet/bindresvport.c
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <unistd.h>
#define START_PORT 768
#define END_PORT IPPORT_RESERVED
#define NUM_PORTS (END_PORT - START_PORT)
int bindresvport(int sd, struct sockaddr_in *sin)
{
struct sockaddr_in me;
static short port;
int ret = 0;
int i;
if (sin == NULL) {
memset(&me, 0, sizeof(me));
sin = &me;
sin->sin_family = AF_INET;
} else if (sin->sin_family != AF_INET) {
errno = EPFNOSUPPORT;
return -1;
}
if (port == 0)
port = START_PORT + (getpid() % NUM_PORTS);
for (i = 0; i < NUM_PORTS; i++, port++) {
if (port == END_PORT)
port = START_PORT;
sin->sin_port = htons(port);
ret = bind(sd, (struct sockaddr *)sin, sizeof(*sin));
if (ret != -1)
break;
}
return ret;
}
|
