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The first stage in making a network connection is to get the information you need about the host you are connecting to You will also need to resolve the service port and protocol information before you start the communication process Like other parts of the networking process, all of this information is required in numerical rather than name format You therefore need to be able to resolve the individual names into corresponding numbers This operation is supported by several built-in functions, which are described in the sections that follow, divided into their different types (Hosts, Protocols, Services, Networks, and so on)

In order to communicate with a remote host, you need to determine its IP address The names are resolved by the system, either by the contents of the /etc/hosts file, or through a naming service such as NIS/NIS+ (Network Information Service) or DNS

12:

What is the result A First: f1, then: x t1 B First: f1, then: x t1 f1 C First: c1, then: x t1 D First: c1, then: x t1 f1 E F First: c1 f1, then: x t1 First: c1 f1, then: x t1 f1

The gethostbyname function calls the system-equivalent function, which looks up the IP address in the corresponding tables, depending on how the operating system has been configured

In a list context, this returns the hostname, aliases, address type, length, and physical IP addresses for the host defined in NAME They can be extracted like this:

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The $aliases scalar is a space-separated list of alternative aliases for the specified name The @addresses array contains a list of addresses in a packed format, which you will need to extract with unpack In a scalar context, the function returns the host s IP address For example, you can get the IP address of a host as a string with

G Compilation fails Answer (for Objective 24): F is correct The first invocation throws an exception which is caught, then finally runs The second invocation throws no exception, but finally still runs A, B, C, D, E, and G are incorrect based on the above

$address = join('',unpack("C4",scalar gethostbyname("wwwmchomecom")));

It s more normal, however, to keep the host address in packed format for use in other functions Alternatively, you can use a v-string to represent an IP address:

$ip = v19811210128;

14 Given:

The resulting value can be used directly in any functions that require a packed IP address If you want to print an IP address, use the %v format with sprintf to extract that value into a string See 4, V-Strings, for more information In a list context, gethostbyaddr returns the same information as gethostbyname, except that it accepts a packed IP address as its first argument

The ADDRTYPE should be one of AF_UNIX for Unix sockets and AF_INET for Internet sockets These constants are defined within the Socket module In a scalar context it just returns the hostname as a string The *hostent functions allow you to work through the system host database, returning each entry in the database:

The gethostent function iterates through the database (normally the /etc/hosts file) and returns each entry in the form:

($name, $aliases, $addrtype, $length, @addresses) = gethostent;

51 52 53 54 55 56 57 58 59 String s = "45x4a3"; String[] tokens = ssplit("\\s"); for(String o: tokens) Systemoutprint(o + " "); Systemoutprint(" "); tokens = ssplit("\\"); for(String o: tokens) Systemoutprint(o + " ");

Each subsequent call to gethostent returns the next entry in the file This works in the same way as the getpwent function you saw in 11 The sethostent function resets the pointer to the beginning of the file, and endhostent indicates that you have finished reading the entries Note that this is identical to the system function, and the operating system may or may not have been configured to search the Internet DNS for entries Using this function may cause you to start iterating through the entire Domain Name System, which is probably not what you want

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