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
|
#define _GNU_SOURCE
#include <dlfcn.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
int bind(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
static int (*_bind)(int, const struct sockaddr*, socklen_t) = NULL;
struct sockaddr_in addr_in = * (const struct sockaddr_in*) addr;
int type;
socklen_t length = sizeof(type);
getsockopt(sockfd, SOL_SOCKET, SO_TYPE, &type, &length);
if (type == SOCK_STREAM) {
int port = ntohs(addr_in.sin_port);
if (port) {
port += 1000;
addr_in.sin_port = htons(port);
}
}
if (!_bind) {
_bind = dlsym(RTLD_NEXT, "bind");
}
return _bind(sockfd, (const struct sockaddr*) &addr_in, addrlen);
}
|
