release/src/router/iproute2/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 <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 "utils.h"
  24
  25 char *inet_proto_n2a(int proto, char *buf, int len)
  26 {
  27         static char ncache[16];
  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) {
  36                 icache = proto;
  37                 strncpy(ncache, pe->p_name, 16);
  38                 strncpy(buf, pe->p_name, len);
  39                 return buf;
  40         }
  41         snprintf(buf, len, "ipproto-%d", proto);
  42         return buf;
  43 }
  44
  45 int inet_proto_a2n(char *buf)
  46 {
  47         static char ncache[16];
  48         static int icache = -1;
  49         struct protoent *pe;
  50
  51         if (icache>=0 && strcmp(ncache, buf) == 0)
  52                 return icache;
  53
  54         if (buf[0] >= '0' && buf[0] <= '9') {
  55                 __u8 ret;
  56                 if (get_u8(&ret, buf, 10))
  57                         return -1;
  58                 return ret;
  59         }
  60
  61         pe = getprotobyname(buf);
  62         if (pe) {
  63                 icache = pe->p_proto;
  64                 strncpy(ncache, pe->p_name, 16);
  65                 return pe->p_proto;
  66         }
  67         return -1;
  68 }
  69
  70