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//==========================================================================
//
// lib/getserv.c
//
// getservbyname(), getservbyport()
//
//==========================================================================
// ####BSDALTCOPYRIGHTBEGIN####
// -------------------------------------------
// Portions of this software may have been derived from FreeBSD, OpenBSD,
// or other sources, and if so are covered by the appropriate copyright
// and license included herein.
// -------------------------------------------
// ####BSDALTCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-01-10
// Purpose:
// Description:
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <sys/param.h>
#include <netdb.h>
#include <errno.h>
// These must return the port in network byte order.
//
// This means treated as a short, because it's a port, despite the types in
// the API and the struct being ints.
//
// The argument to getservbyport() is also network byte order, so that code
// must change to flip before comparing.
static struct servent services[] = {
{ "ftp", 0, 21 , "tcp" },
{ "ftp-data", 0, 20 , "tcp" },
{ "domain", 0, 53 , "udp" },
{ "tftp", 0, 69 , "udp" },
{ "ntp", 0, 123 , "udp" },
{ "snmp", 0, 161 , "udp" },
{ NULL, 0, 0 , NULL }
};
// Note that this contains no interlocking between clients of the
// interface; but this is completely typical of such APIs.
static struct servent *
setreturned( struct servent *p )
{
static struct servent returned;
returned.s_name = p->s_name;
returned.s_aliases = p->s_aliases;
returned.s_port = htons(p->s_port); // return in net order
returned.s_proto = p->s_proto;
return &returned;
}
struct servent *
getservbyname(const char *name, const char *proto)
{
struct servent *p = services;
while (p->s_name) {
if ((strcmp(name, p->s_name) == 0) &&
(strcmp(proto, p->s_proto) == 0)) {
return setreturned(p);
}
p++;
}
errno = ENOENT;
return (struct servent *)0;
}
struct servent *
getservbyport(const int num, const char *proto)
{
struct servent *p = services;
int port = ntohs(num);
while (p->s_name) {
if ((p->s_port == port) &&
(strcmp(proto, p->s_proto) == 0)) {
return setreturned(p);
}
p++;
}
errno = ENOENT;
return (struct servent *)0;
}
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