src/network/networkd-util.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "conf-parser.h"
  23 #include "networkd-util.h"
  24 #include "parse-util.h"
  25 #include "string-table.h"
  26 #include "string-util.h"
  27 #include "util.h"
  28
  29 const char *address_family_boolean_to_string(AddressFamilyBoolean b) {
  30         if (b == ADDRESS_FAMILY_YES ||
  31             b == ADDRESS_FAMILY_NO)
  32                 return yes_no(b == ADDRESS_FAMILY_YES);
  33
  34         if (b == ADDRESS_FAMILY_IPV4)
  35                 return "ipv4";
  36         if (b == ADDRESS_FAMILY_IPV6)
  37                 return "ipv6";
  38
  39         return NULL;
  40 }
  41
  42 AddressFamilyBoolean address_family_boolean_from_string(const char *s) {
  43         int r;
  44
  45         /* Make this a true superset of a boolean */
  46
  47         r = parse_boolean(s);
  48         if (r > 0)
  49                 return ADDRESS_FAMILY_YES;
  50         if (r == 0)
  51                 return ADDRESS_FAMILY_NO;
  52
  53         if (streq(s, "ipv4"))
  54                 return ADDRESS_FAMILY_IPV4;
  55         if (streq(s, "ipv6"))
  56                 return ADDRESS_FAMILY_IPV6;
  57
  58         return _ADDRESS_FAMILY_BOOLEAN_INVALID;
  59 }
  60
  61 DEFINE_CONFIG_PARSE_ENUM(config_parse_address_family_boolean, address_family_boolean, AddressFamilyBoolean, "Failed to parse option");
  62
  63 int config_parse_address_family_boolean_with_kernel(
  64                 const char* unit,
  65                 const char *filename,
  66                 unsigned line,
  67                 const char *section,
  68                 unsigned section_line,
  69                 const char *lvalue,
  70                 int ltype,
  71                 const char *rvalue,
  72                 void *data,
  73                 void *userdata) {
  74
  75         AddressFamilyBoolean *fwd = data, s;
  76
  77         assert(filename);
  78         assert(lvalue);
  79         assert(rvalue);
  80         assert(data);
  81
  82         /* This function is mostly obsolete now. It simply redirects
  83          * "kernel" to "no". In older networkd versions we used to
  84          * distuingish IPForward=off from IPForward=kernel, where the
  85          * former would explicitly turn off forwarding while the
  86          * latter would simply not touch the setting. But that logic
  87          * is gone, hence silently accept the old setting, but turn it
  88          * to "no". */
  89
  90         s = address_family_boolean_from_string(rvalue);
  91         if (s < 0) {
  92                 if (streq(rvalue, "kernel"))
  93                         s = ADDRESS_FAMILY_NO;
  94                 else {
  95                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse IPForward= option, ignoring: %s", rvalue);
  96                         return 0;
  97                 }
  98         }
  99
 100         *fwd = s;
 101
 102         return 0;
 103 }
 104
 105 static const char* const resolve_support_table[_RESOLVE_SUPPORT_MAX] = {
 106         [RESOLVE_SUPPORT_NO] = "no",
 107         [RESOLVE_SUPPORT_YES] = "yes",
 108         [RESOLVE_SUPPORT_RESOLVE] = "resolve",
 109 };
 110
 111 DEFINE_STRING_TABLE_LOOKUP(resolve_support, ResolveSupport);
 112
 113 int config_parse_resolve(
 114                 const char* unit,
 115                 const char *filename,
 116                 unsigned line,
 117                 const char *section,
 118                 unsigned section_line,
 119                 const char *lvalue,
 120                 int ltype,
 121                 const char *rvalue,
 122                 void *data,
 123                 void *userdata) {
 124
 125         ResolveSupport *resolve = data;
 126         int k;
 127
 128         assert(filename);
 129         assert(lvalue);
 130         assert(rvalue);
 131         assert(resolve);
 132
 133         /* Our enum shall be a superset of booleans, hence first try
 134          * to parse as boolean, and then as enum */
 135
 136         k = parse_boolean(rvalue);
 137         if (k > 0)
 138                 *resolve = RESOLVE_SUPPORT_YES;
 139         else if (k == 0)
 140                 *resolve = RESOLVE_SUPPORT_NO;
 141         else {
 142                 ResolveSupport s;
 143
 144                 s = resolve_support_from_string(rvalue);
 145                 if (s < 0){
 146                         log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse %s= option, ignoring: %s", lvalue, rvalue);
 147                         return 0;
 148                 }
 149
 150                 *resolve = s;
 151         }
 152
 153         return 0;
 154 }