LXR iproute2/lib/inet

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * inet_proto.c
   4 *
   5 * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6 */
   7
   8#include <stdio.h>
   9#include <stdlib.h>
  10#include <unistd.h>
  11#include <fcntl.h>
  12#include <sys/socket.h>
  13#include <netinet/in.h>
  14#include <netdb.h>
  15#include <string.h>
  16
  17#include "rt_names.h"
  18#include "utils.h"
  19
  20const char *inet_proto_n2a(int proto, char *buf, int len)
  21{
  22        static char *ncache;
  23        static int icache = -1;
  24        struct protoent *pe;
  25
  26        if (proto == icache)
  27                return ncache;
  28
  29        pe = getprotobynumber(proto);
  30        if (pe && !numeric) {
  31                if (icache != -1)
  32                        free(ncache);
  33                icache = proto;
  34                ncache = strdup(pe->p_name);
  35                strlcpy(buf, pe->p_name, len);
  36                return buf;
  37        }
  38        snprintf(buf, len, "ipproto-%d", proto);
  39        return buf;
  40}
  41
  42int inet_proto_a2n(const char *buf)
  43{
  44        static char *ncache;
  45        static int icache = -1;
  46        struct protoent *pe;
  47        __u8 ret;
  48
  49        if (icache != -1 && strcmp(ncache, buf) == 0)
  50                return icache;
  51
  52        if (!get_u8(&ret, buf, 10))
  53                return ret;
  54
  55        pe = getprotobyname(buf);
  56        if (pe) {
  57                if (icache != -1)
  58                        free(ncache);
  59                icache = pe->p_proto;
  60                ncache = strdup(pe->p_name);
  61                return pe->p_proto;
  62        }
  63        return -1;
  64}
  65