lib/inet_proto.c

   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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <netdb.h>
  20 #include <string.h>
  21 #ifdef HAVE_LIBBSD
  22 #include <bsd/string.h>
  23 #endif
  24
  25 #include "rt_names.h"
  26 #include "utils.h"
  27
  28 const char *inet_proto_n2a(int proto, char *buf, int len)
  29 {
  30         static char *ncache;
  31         static int icache = -1;
  32         struct protoent *pe;
  33
  34         if (proto == icache)
  35                 return ncache;
  36
  37         pe = getprotobynumber(proto);
  38         if (pe) {
  39                 if (icache != -1)
  40                         free(ncache);
  41                 icache = proto;
  42                 ncache = strdup(pe->p_name);
  43                 strlcpy(buf, pe->p_name, len);
  44                 return buf;
  45         }
  46         snprintf(buf, len, "ipproto-%d", proto);
  47         return buf;
  48 }
  49
  50 int inet_proto_a2n(const char *buf)
  51 {
  52         static char *ncache;
  53         static int icache = -1;
  54         struct protoent *pe;
  55         __u8 ret;
  56
  57         if (icache != -1 && strcmp(ncache, buf) == 0)
  58                 return icache;
  59
  60         if (!get_u8(&ret, buf, 10))
  61                 return ret;
  62
  63         pe = getprotobyname(buf);
  64         if (pe) {
  65                 if (icache != -1)
  66                         free(ncache);
  67                 icache = pe->p_proto;
  68                 ncache = strdup(pe->p_name);
  69                 return pe->p_proto;
  70         }
  71         return -1;
  72 }