Re: socket return -1 (EPERM, Operation not permitted) on macOS

I am build a VPN app for macOS by useing Packet Tunnel Provider. I try to use UDP socket to send data to server in the Extension, but the socket "sendto" return -1 with errno set to EPERM(Operation not permitted). However I try the same code in iOS, it is working fine. Below is the sample code.

          #include <sys/socket.h>

          #include <netinet/in.h>

          #include <arpa/inet.h>

          #include <netdb.h>

          int sock = socket(AF_INET, SOCK_DGRAM, 0);

          assert(sock >= 0);   

          int success = fcntl(sock, F_SETFL, O_NONBLOCK);

          assert(success == 0);

          struct sockaddr_in addr = {

                .sin_len = sizeof(struct sockaddr),

                .sin_family = AF_INET,

                .sin_port = htons(1235)

          };

          success = bind(sock, (const struct sockaddr *) &addr, sizeof(addr));

          assert(success == 0);

          struct sockaddr_in addrsock = {

                .sin_len = sizeof(struct sockaddr),

                .sin_family = AF_INET,

                .sin_port = htons(1235),

                .sin_addr.s_addr = inet_addr("119.xx.xxx.102")

          };

          char *my_messsage = "this is a test message";

          ssize_t bytesSent = sendto(

                                       sock,

                                       my_messsage,

                                       strlen(my_messsage),

                                       0,

                                       (const struct sockaddr *) &addrsock,

                                       sizeof(addr)

                                       );

Thanks!