usr/src/cmd/ipf/lib/common/portnum.c

   1 /*
   2  * Copyright (C) 1993-2001 by Darren Reed.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  *
   6  *
   7  * $Id: portnum.c,v 1.6.4.1 2004/12/09 19:41:22 darrenr Exp $
   8  */
   9
  10 #include <ctype.h>
  11
  12 #include "ipf.h"
  13
  14
  15 /*
  16  * find the port number given by the name, either from getservbyname() or
  17  * straight atoi(). Return 1 on success, 0 on failure
  18  */
  19 int     portnum(name, proto, port, linenum)
  20 char    *name, *proto;
  21 u_short *port;
  22 int     linenum;
  23 {
  24         struct  servent *sp, *sp2;
  25         u_short p1 = 0;
  26         int i;
  27
  28         if (ISDIGIT(*name)) {
  29                 if (ratoi(name, &i, 0, USHRT_MAX)) {
  30                         *port = (u_short)i;
  31                         return 1;
  32                 }
  33                 fprintf(stderr, "%d: unknown port \"%s\"\n", linenum, name);
  34                 return 0;
  35         }
  36         if (proto != NULL && strcasecmp(proto, "tcp/udp") != 0) {
  37                 sp = getservbyname(name, proto);
  38                 if (sp) {
  39                         *port = ntohs(sp->s_port);
  40                         return 1;
  41                 }
  42                 fprintf(stderr, "%d: unknown service \"%s\".\n", linenum, name);
  43                 return 0;
  44         }
  45         sp = getservbyname(name, "tcp");
  46         if (sp)
  47                 p1 = sp->s_port;
  48         sp2 = getservbyname(name, "udp");
  49         if (!sp || !sp2) {
  50                 fprintf(stderr, "%d: unknown tcp/udp service \"%s\".\n",
  51                         linenum, name);
  52                 return 0;
  53         }
  54         if (p1 != sp2->s_port) {
  55                 fprintf(stderr, "%d: %s %d/tcp is a different port to ",
  56                         linenum, name, p1);
  57                 fprintf(stderr, "%d: %s %d/udp\n", linenum, name, sp->s_port);
  58                 return 0;
  59         }
  60         *port = ntohs(p1);
  61         return 1;
  62 }