iPhone, C/objC: getting hostname (not by resolving from IP) by hooking into system wide functions?

Question

I'm currently writing an MobileSubstrate plugin (code injection for iPhone). It gets the hostname by hooking into connect() and this piece of code:

#ifndef   NI_MAXHOST
#define   NI_MAXHOST 1025
#endif

int error;

 char hostname[NI_MAXHOST] = "";


 error = getnameinfo(serv_addr, addrlen, hostname, NI_MAXHOST, NULL, 0, 0);

 if (error !=0) {
  ALogTCP(@"coudldn't resolve hostname or internal connect");

  return orig__connect(sockfd, serv_addr, addrlen);
  }


 if (error == 0) {
  ALogTCP(@"hostname: %s", hostname);
  NSString *hostFirst = [NSString stringWithCString:hostname];
}

Now I've noticed that some hostnames won't get resolved properly (wrong host: like connect.xyz.com instead of irc.xyz.com) (depending on the DNS Server).

I'm not very used to all the networking functions and an extensive search didn't turn up any solution.: I'm thinking about hooking into a function which is responsible for all hostname->IP "conversions", getting the hostname and use it later in the above code. Is there such a function? and how is it called?

Thank you very much in advance.

Answer 1

this is how I finally did it, took me only about 7 hours to figure it out :D

1. hooking into CFHostCreateWithName(CFAllocatorRef *allocator, CFStringRef *hostname)

2. after that I use gethostbyname to get the IP.

now I can compare that information with the one I retrieve by hooking into connect()