lib/common/portname.c

/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: portname.c,v 1.7 2003/08/14 14:27:43 darrenr Exp $
 */
#include "ipf.h"


char    *portname(pr, port)
int pr, port;
{
    static  char    buf[32];
    struct  protoent    *p = NULL;
    struct  servent *sv = NULL, *sv1 = NULL;

    if ((opts & OPT_NORESOLVE) == 0) {
        if (pr == -1) {
            if ((sv = getservbyport(htons(port), "tcp"))) {
                strncpy(buf, sv->s_name, sizeof(buf)-1);
                buf[sizeof(buf)-1] = '\0';
                sv1 = getservbyport(htons(port), "udp");
                sv = strncasecmp(buf, sv->s_name, strlen(buf)) ?
                     NULL : sv1;
            }
            if (sv)
                return buf;
        } else if ((pr != -2) && (p = getprotobynumber(pr))) {
            if ((sv = getservbyport(htons(port), p->p_name))) {
                strncpy(buf, sv->s_name, sizeof(buf)-1);
                buf[sizeof(buf)-1] = '\0';
                return buf;
            }
        }
    }

    (void) sprintf(buf, "%d", port);
    return buf;
}