getnameinfo() - Reverse DNS lookup (IP Address to hostname) C/C++ -


66.249.68.9 for IPAddress ("DIG-X" correctly "Crawl-66-249-68-9 Tablets "Com") My sweet program claims that this is IP 68-9-0-0.ri.ri.cox.net.

I do not care if I call it down in a way I want to start with just an IPv4 IP address and walk with the hostname.

Bonus question, What is the service? I think I will not need it, and getnameinfo will give NULL but , W "17145" is being output for the serial service buffer. 

  #include & lt; string & gt; # Include & lt; iostream & gt; Using Namespace STD; & Lt; netdb.h & gt; // Structure Sockdor, AFXAT, NI_NEMERCD, getnameinfo #include & lt; string H & gt; // memset #include & lt; arpa / inet.h & gt; // inet_pton int main () {Const string ipadress {"66.249.68.9"}; structure soaked stroke co-founder; memeset (& structure soak another, 0, structSockAddr); StructSockAddr.sa_family = AF_INET; Intetphone Returns Vala {inet_pton (AF_INET, IPAddress.c_str (), and structSockAddr.sa_data)}; If (1! = InetPtonReturnValue) {cout & lt; & Lt; "InetPtonReturnValue:" & lt; & Lt; InetPtonReturnValue & lt; & Lt; Endl; // 0 = src is not a valid address, -1 = AF is not a valid family) four host buffers [10000]; Four service buffers [1000]; Int getNameInfoReturnValue {getnameinfo (& amp; structSockAddr, sizeof (structSockAddr), hostBuffer, sizeof (hostBuffer), service buffer, sizeof (serviceBuffer), NI_NAMEREQD)}; If (0! = GetNameInfoReturnValue) {cout & lt; & Lt; "GetNameInfoReturnValue:" & lt; & Lt; GetNameInfoReturnValue & lt; & Lt; Andal & lt; & Lt; "Gai_strerror ():" & lt; & Lt; Gai_strerror (getNameInfoReturnValue) & lt; & Lt; Endl; } And {cout & lt; & Lt; "IPaders:" & lt; & Lt; IP Adapter & lt; & Lt; Andal & lt; & Lt; "Hostbuffer:" & lt; & Lt; HostBuffer & lt; & Lt; Andal & lt; & Lt; "Service buffer:" & lt; & Lt; Service buffer & lt; & Lt; Endl; }}    
 
 
 When you call a  struct sockaddr  For calling signing on using  inet_pton  it is necessary for either a  struct in_addr  for AF_INET (or  struct in6_addr  for IPv6 ) And then you have to use it to create a  struct sockaddr  for later functions.  
 As currently stands, you are writing some bytes in the field before the actual IP address in the field, so you end up with the previous 2 octet of IP in your Sockdra field.

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more