[英]Is there any C socket function, which can look for datagrams from a specific UDP client?
The server I am building uses the UDP transport layer protocol.我正在构建的服务器使用 UDP 传输层协议。 I have a scenario where multiple clients can send datagrams to my server.我有一个场景,多个客户端可以将数据报发送到我的服务器。 But each client may send the data across multiple datagrams, and before starting to process the data, I need to have the entire data at the server.但是每个客户端可能会跨多个数据报发送数据,在开始处理数据之前,我需要在服务器上拥有整个数据。 From the man page of recvfrom()
, it sounds like it reads the datagrams from any UDP client.从recvfrom()
的手册页中,听起来它从任何 UDP 客户端读取数据报。 Are there any recv*()
family functions that enable us to read from a specific UDP client?是否有任何recv*()
系列函数使我们能够从特定的 UDP 客户端读取?
#include <netinet/in.h>
#include <sys/socket.h>
int append_data(void* buf, int size);
int main()
{
/* Create a UDP socket and bind to a port */
int sockfd;
char rd_buf[100];
struct sockaddr_in cliaddr;
for ( ; ; ) {
/* Recvfrom any client */
int addr_len = sizeof(cliaddr);
int rd_status = recvfrom(sockfd, rd_buf, sizeof(rd_buf), 0, (struct sockaddr*) &cliaddr, &addr_len);
if (append_data(rd_buf, rd_status) == DATA_COMPLETE)
continue;
/* Recvfrom a particular client */
for ( ; ; ) {
/* Any function similar to recvfromcli() ? */
int rd_status = recvfromcli(sockfd, rd_buf, sizeof(rd_buf), 0, (struct sockaddr*) &cliaddr, addr_len);
if (append_data(rd_buf, rd_status) == DATA_COMPLETE)
break;
}
}
}
If not what are my other alternatives?如果不是,我的其他选择是什么?
You can create a separate UDP socket that is bind()
'ed to the local IP/Port and connect()
'ed to a specific client IP/Port, then you can recv()
using that socket, and it will give you datagrams from only that client.您可以创建一个单独的 UDP 套接字,该套接字bind()
被绑定到本地 IP/端口,并且connect()
被绑定到特定客户端 IP/端口,然后您可以使用该套接字进行recv()
,它会给您数据报仅来自该客户。
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