chiark / gitweb /
resolve: reject empty TXT records
[elogind.git] / src / resolve / resolved-conf.c
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4   This file is part of systemd.
5
6   Copyright 2014 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
24 #include "resolved-conf.h"
25
26 int manager_parse_dns_server(Manager *m, DnsServerType type, const char *string) {
27         const char *word, *state;
28         size_t length;
29         DnsServer *first;
30         int r;
31
32         assert(m);
33         assert(string);
34
35         first = type == DNS_SERVER_FALLBACK ? m->fallback_dns_servers : m->dns_servers;
36
37         FOREACH_WORD_QUOTED(word, length, string, state) {
38                 char buffer[length+1];
39                 int family;
40                 union in_addr_union addr;
41                 bool found = false;
42                 DnsServer *s;
43
44                 memcpy(buffer, word, length);
45                 buffer[length] = 0;
46
47                 r = in_addr_from_string_auto(buffer, &family, &addr);
48                 if (r < 0) {
49                         log_warning("Ignoring invalid DNS address '%s'", buffer);
50                         continue;
51                 }
52
53                 /* Filter out duplicates */
54                 LIST_FOREACH(servers, s, first)
55                         if (s->family == family && in_addr_equal(family, &s->address, &addr)) {
56                                 found = true;
57                                 break;
58                         }
59
60                 if (found)
61                         continue;
62
63                 r = dns_server_new(m, NULL, type, NULL, family, &addr);
64                 if (r < 0)
65                         return r;
66         }
67
68         return 0;
69 }
70
71 int config_parse_dnsv(
72                 const char *unit,
73                 const char *filename,
74                 unsigned line,
75                 const char *section,
76                 unsigned section_line,
77                 const char *lvalue,
78                 int ltype,
79                 const char *rvalue,
80                 void *data,
81                 void *userdata) {
82
83         Manager *m = userdata;
84         int r;
85
86         assert(filename);
87         assert(lvalue);
88         assert(rvalue);
89         assert(m);
90
91         if (isempty(rvalue))
92                 /* Empty assignment means clear the list */
93                 manager_flush_dns_servers(m, ltype);
94         else {
95                 /* Otherwise add to the list */
96                 r = manager_parse_dns_server(m, ltype, rvalue);
97                 if (r < 0) {
98                         log_syntax(unit, LOG_ERR, filename, line, -r, "Failed to parse DNS server string '%s'. Ignoring.", rvalue);
99                         return 0;
100                 }
101         }
102
103         /* If we have a manual setting, then we stop reading
104          * /etc/resolv.conf */
105         if (ltype == DNS_SERVER_SYSTEM)
106                 m->read_resolv_conf = false;
107
108         return 0;
109 }
110
111 int config_parse_support(
112                 const char *unit,
113                 const char *filename,
114                 unsigned line,
115                 const char *section,
116                 unsigned section_line,
117                 const char *lvalue,
118                 int ltype,
119                 const char *rvalue,
120                 void *data,
121                 void *userdata) {
122
123         Manager *m = userdata;
124         Support support, *v = data;
125         int r;
126
127         assert(filename);
128         assert(lvalue);
129         assert(rvalue);
130         assert(m);
131
132         support = support_from_string(rvalue);
133         if (support < 0) {
134                 r = parse_boolean(rvalue);
135                 if (r < 0) {
136                         log_syntax(unit, LOG_ERR, filename, line, -r, "Failed to parse support level '%s'. Ignoring.", rvalue);
137                         return 0;
138                 }
139
140                 support = r ? SUPPORT_YES : SUPPORT_NO;
141         }
142
143         *v = support;
144         return 0;
145 }
146
147 int manager_parse_config_file(Manager *m) {
148         assert(m);
149
150         return config_parse(NULL, "/etc/systemd/resolved.conf", NULL,
151                             "Resolve\0",
152                             config_item_perf_lookup, resolved_gperf_lookup,
153                             false, false, true, m);
154 }