LXR iproute2/lib/inet

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