我的問題是:如何獲取接受的入站套接字的IP地址?
服務器將創建一個套接字,綁定到給定的端口和地址= INADDR_ANY。 ()& accept()新的連接。然後,我們可以從accept()獲取客戶端的IP地址
。
現在,我想知道服務器的IP地址,因爲服務器的主機上有
多個NIC。
如何知道接受的入站套接字來自哪個網絡接口的ip地址?
我試過getsockname,它給了我端口號,但ip是全零。
更新:這裏是代碼:
Server.c(頭文件被刪除)
int main(void)
{
struct sockaddr_in stSockAddr;
int res, addr_len, SocketFD, ConnectFD;
struct sockaddr_in addr;
SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if(-1 == SocketFD)
{
perror("can not create socket");
//exit(EXIT_FAILURE);
return -1;
}
memset(&stSockAddr, 0, sizeof stSockAddr);
stSockAddr.sin_family = AF_INET;
stSockAddr.sin_port = htons(49335);
stSockAddr.sin_addr.s_addr = INADDR_ANY;
if(-1 == bind(SocketFD,(struct sockaddr *)&stSockAddr, sizeof stSockAddr))
{
perror("error bind failed");
close(SocketFD);
return -1;
}
printf("going to listen!\n");
if(-1 == listen(SocketFD, 10))
{
perror("error listen failed");
close(SocketFD);
//exit(EXIT_FAILURE);
return -1;
}
ConnectFD = accept(SocketFD, NULL, NULL);
if(0 > ConnectFD)
{
perror("error accept failed");
close(SocketFD);
//exit(EXIT_FAILURE);
return -1;
}
addr.sin_family = AF_INET;
res = getsockname (ConnectFD, (struct sockaddr *)&addr, &addr_len);
// if you remove the following comment, that means, if you call
// two times of getsockname, the result will be correct.
//res = getsockname (ConnectFD, (struct sockaddr *)&addr, &addr_len);
printf("addr:%x\n", addr.sin_addr.s_addr);
while(1) {
if (getchar() == 'q')
break;
}
close(ConnectFD);
close(SocketFD);
return 0;
}
下面是client.c:
int main(void)
{
struct sockaddr_in stSockAddr;
int Res;
int SocketFD = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
if (-1 == SocketFD)
{
perror("cannot create socket");
exit(EXIT_FAILURE);
}
memset(&stSockAddr, 0, sizeof stSockAddr);
stSockAddr.sin_family = AF_INET;
stSockAddr.sin_port = htons(49335);
Res = inet_pton(AF_INET, "192.168.1.102", &stSockAddr.sin_addr);
if (0 > Res)
{
perror("error: first parameter is not a valid address family");
close(SocketFD);
exit(EXIT_FAILURE);
}
else if (0 == Res)
{
perror("char string (second parameter does not contain valid ipaddress");
close(SocketFD);
exit(EXIT_FAILURE);
}
if (-1 == connect(SocketFD, (struct sockaddr *)&stSockAddr, sizeof stSockAddr))
{
perror("connect failed");
close(SocketFD);
exit(EXIT_FAILURE);
}
/* perform read write operations ... */
printf("client sockfd is successful\n");
while(1) {
if (getchar() == 'q')
break;
}
shutdown(SocketFD, SHUT_RDWR);
close(SocketFD);
return 0;
}
請簡單編輯您的問題以提供更多信息。嚴格保留答案以解決您的問題。您也可以在您的問題下使用評論功能,或者使用任何答案來討論已發佈的解決方案或提供說明。 – 2011-03-24 10:28:55