gistfile1.c

// Network Packet Struct
typedef struct {
    int fd;
    struct sockaddr_in cli_addr;
    int length;
    char buffer[];
} NET_PACKET;

void receive_payload( int fd, struct sockaddr_in cli_addr, char buffer[], int length ) {

    NET_PACKET *packet = malloc( sizeof packet + length + 1 );
    
    if( packet == NULL ) {
    printf( "failed.\n" );
    exit( EXIT_FAILURE );
    }

    memcpy( packet->buffer, buffer, strlen( buffer ) + 1 );
    
    receive_nonce( *packet );

}

void receive_nonce( NET_PACKET packet ) {

  printf( "Received nonce %s\n", packet.buffer );

}