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