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/*
* inet_proto.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#include "rt_names.h"
#include "utils.h"
const char *inet_proto_n2a(int proto, char *buf, int len)
{
static char *ncache;
static int icache = -1;
struct protoent *pe;
if (proto == icache)
return ncache;
pe = getprotobynumber(proto);
if (pe && !numeric) {
if (icache != -1)
free(ncache);
icache = proto;
ncache = strdup(pe->p_name);
strlcpy(buf, pe->p_name, len);
return buf;
}
snprintf(buf, len, "ipproto-%d", proto);
return buf;
}
int inet_proto_a2n(const char *buf)
{
static char *ncache;
static int icache = -1;
struct protoent *pe;
__u8 ret;
if (icache != -1 && strcmp(ncache, buf) == 0)
return icache;
if (!get_u8(&ret, buf, 10))
return ret;
pe = getprotobyname(buf);
if (pe) {
if (icache != -1)
free(ncache);
icache = pe->p_proto;
ncache = strdup(pe->p_name);
return pe->p_proto;
}
return -1;
}
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