It's called something like us_socket_remote_address or similar. Look in uSockets

I couldn't get the remote port out of that function. But I got it using the following technique. Testing shows it works, but is it safe to cast us_socket_get_native_handle to uintptr_t?

#include "App.h"
#include "cassert"
#include <netinet/in.h>

using namespace std;

struct PerSocketData {};

int main() {
   uWS::App app;
   
   app.ws<PerSocketData>("/*", {
         .open = [](auto *ws) {
            us_socket_t *s = (us_socket_t *) ws;

            // is this cast safe?
            auto fd = (uintptr_t) us_socket_get_native_handle(0, s); 
            
            struct sockaddr_storage addr;
            socklen_t len = sizeof addr;
            if (getpeername(fd, (struct sockaddr*)&addr, &len)) {
               perror("getpeername");
               return;
            }

            int port;
            
            // deal with both IPv4 and IPv6:
            if (addr.ss_family == AF_INET) {
               struct sockaddr_in *s = (struct sockaddr_in *)&addr;
               port = ntohs(s->sin_port);
            } else if (addr.ss_family == AF_INET6) {
               struct sockaddr_in6 *s = (struct sockaddr_in6 *)&addr;
               port = ntohs(s->sin6_port);
            } else {
               assert(0);
            }

            cout << "got connection from port " << port << endl;
            
            ws->send("from server", uWS::OpCode::TEXT);
         },
           }).listen(9001, [](auto *) {
           });

   app.run();
}

Get client(remote) port #1034

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