Using the serviceentry class
Introduction
The serviceentry class provides methods for retrieving network service definitions. These are usually defined in a file like /etc/services on unix-like systems or C:\Windows\System32\drivers\etc\services on Windows, or are served from another source via the name-service switch.
Services can be looked up by name or number.
Lookup By Name
In this example, information for the "smtp" service, "tcp" protocol is retrieved.
// Copyright (c) 1999-2018 David Muse
// See the file COPYING for more information
#include <rudiments/serviceentry.h>
#include <rudiments/stdio.h>
int main(int argc, const char **argv) {
// get the service information for "smtp","tcp" protocol
serviceentry se;
se.open("smtp","tcp");
// print out details
stdoutput.printf(" Name: %s\n",se.getName());
stdoutput.printf(" Port: %d\n",se.getPort());
stdoutput.printf(" Protocol: %s\n",se.getProtocol());
stdoutput.printf(" Alias list:\n");
for (uint32_t i=0; se.getAliasList() && se.getAliasList()[i]; i++) {
stdoutput.printf(" %s\n",se.getAliasList()[i]);
}
}
Lookup By Number
In this example, information for "service number 25", "tcp" protocol is retrieved.
// Copyright (c) 1999-2018 David Muse
// See the file COPYING for more information
#include <rudiments/serviceentry.h>
#include <rudiments/stdio.h>
int main(int argc, const char **argv) {
// get the service information for the service
// that would run on port 25, "tcp" protocol
serviceentry se;
se.open(25,"tcp");
// print out details
stdoutput.printf(" Name: %s\n",se.getName());
stdoutput.printf(" Port: %d\n",se.getPort());
stdoutput.printf(" Protocol: %s\n",se.getProtocol());
stdoutput.printf(" Alias list:\n");
for (uint32_t i=0; se.getAliasList() && se.getAliasList()[i]; i++) {
stdoutput.printf(" %s\n",se.getAliasList()[i]);
}
}
