1 /*
2 * inet_proto.c
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <syslog.h>
17 #include <fcntl.h>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
20 #include <netdb.h>
21 #include <string.h>
22
23 #include "rt_names.h"
24 #include "utils.h"
25
inet_proto_n2a(int proto,char * buf,int len)26 const char *inet_proto_n2a(int proto, char *buf, int len)
27 {
28 static char *ncache;
29 static int icache = -1;
30 struct protoent *pe;
31
32 if (proto == icache)
33 return ncache;
34
35 pe = getprotobynumber(proto);
36 if (pe) {
37 if (icache != -1)
38 free(ncache);
39 icache = proto;
40 ncache = strdup(pe->p_name);
41 strlcpy(buf, pe->p_name, len);
42 return buf;
43 }
44 snprintf(buf, len, "ipproto-%d", proto);
45 return buf;
46 }
47
inet_proto_a2n(const char * buf)48 int inet_proto_a2n(const char *buf)
49 {
50 static char *ncache;
51 static int icache = -1;
52 struct protoent *pe;
53 __u8 ret;
54
55 if (icache != -1 && strcmp(ncache, buf) == 0)
56 return icache;
57
58 if (!get_u8(&ret, buf, 10))
59 return ret;
60
61 pe = getprotobyname(buf);
62 if (pe) {
63 if (icache != -1)
64 free(ncache);
65 icache = pe->p_proto;
66 ncache = strdup(pe->p_name);
67 return pe->p_proto;
68 }
69 return -1;
70 }
71