tencent cloud

//Define TOA variables. Set `TOA_BASE_CTL` to 4096.
enum {  
    TOA_BASE_CTL            = 4096,  
    TOA_SO_SET_MAX          = TOA_BASE_CTL,  
    TOA_SO_GET_LOOKUP       = TOA_BASE_CTL,  
    TOA_SO_GET_MAX          = TOA_SO_GET_LOOKUP,  
};  
//Define a data structure to store the IP address.
struct toa_nat64_peer {  
    struct in6_addr saddr;  
    uint16_t sport;  
};  
//Declare the variable that is used to store the address.  
struct toa_nat64_peer client_addr;  
.……  
//Get the file descriptor of the client, where `listenfd` is the listening file descriptor of the server.  
client_fd = accept(listenfd, (struct sockaddr*)&caddr, &length);  
//Make calls to get the real client IP address of the user in the NAT64 scenario.  
char from[40];  
int len = sizeof(struct toa_nat64_peer);  
if (getsockopt(client_fd, IPPROTO_IP, TOA_SO_GET_LOOKUP, &client_addr, &len) == 0) {  
    inet_ntop(AF_INET6, &client_addr.saddr, from, sizeof(from));  
    //Obtain the source IP and source port  
    printf("real client [%s]:%d\\n", from, ntohs(client_addr.sport));  
}  

//Define TOA variables. Set `TOA_BASE_CTL` to 4096.  
enum {  
    TOA_BASE_CTL = 4096,  
    TOA_SO_SET_MAX = TOA_BASE_CTL,  
    TOA_SO_GET_LOOKUP = TOA_BASE_CTL,  
    TOA_SO_GET_MAX = TOA_SO_GET_LOOKUP,   
};  

//Define a data structure to store the IP address.    
struct toa_nat64_peer {    
    struct in6_addr saddr;    
    uint16_t sport;    
};    

//Declare the variable that is used to store the address.    
struct toa_nat64_peer client_addr_nat64;    
.......  
//Get the file descriptor of the client, where `listenfd` is the listening file descriptor of the server.  
//Make calls to get the real client IP in the NAT64 scenario.   
char from[40];    
int len = sizeof(struct toa_nat64_peer);  
int ret;  
ret = getsockopt(client_fd, IPPROTO_IP, TOA_SO_GET_LOOKUP, &client_addr_nat64, &len);  
if (ret == 0) {  
    inet_ntop(AF_INET6, &(client_addr_nat64.saddr), from, sizeof(from));    
    //Obtain the source IP and source port.   
    printf("real client v6 [%s]:%d\\n", from, ntohs(client_addr_nat64.sport));   
} else if (ret != 0) {  
    struct sockaddr v4addr;  
    len = sizeof(struct sockaddr);  
    //Obtain the source IP and source port:  
    //In the hybrid cloud deployment scenario, the source IP address is the IP address after SNAT;  
    //In the non-hybrid cloud deployment scenario, the source IP address is the client IP address without SNAT and NAT64.  
    //The semantics of this function is to get the real client address and port.  
    if (get_peer_name(client_fd, &v4addr, &len) == 0) {  
        inet_ntop(AF_INET, &(((struct sockaddr_in *)&v4addr)->sin_addr), from, sizeof(from));  
        printf("real client v4 [%s]:%d\\n", from, ntohs(((struct sockaddr_in *)&v4addr)->sin_port));   
    }  
}

cat /proc/net/toa_table

cat /proc/net/toa_stats