Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <getopt.h>
4 : #include <net/if.h>
5 :
6 : #include "alloc-util.h"
7 : #include "def.h"
8 : #include "dns-domain.h"
9 : #include "extract-word.h"
10 : #include "fileio.h"
11 : #include "parse-util.h"
12 : #include "pretty-print.h"
13 : #include "resolvconf-compat.h"
14 : #include "resolvectl.h"
15 : #include "resolved-def.h"
16 : #include "string-util.h"
17 : #include "strv.h"
18 : #include "terminal-util.h"
19 :
20 0 : static int resolvconf_help(void) {
21 0 : _cleanup_free_ char *link = NULL;
22 : int r;
23 :
24 0 : r = terminal_urlify_man("resolvectl", "1", &link);
25 0 : if (r < 0)
26 0 : return log_oom();
27 :
28 0 : printf("%1$s -a INTERFACE < FILE\n"
29 : "%1$s -d INTERFACE\n"
30 : "\n"
31 : "Register DNS server and domain configuration with systemd-resolved.\n\n"
32 : " -h --help Show this help\n"
33 : " --version Show package version\n"
34 : " -a Register per-interface DNS server and domain data\n"
35 : " -d Unregister per-interface DNS server and domain data\n"
36 : " -f Ignore if specified interface does not exist\n"
37 : " -x Send DNS traffic preferably over this interface\n"
38 : "\n"
39 : "This is a compatibility alias for the resolvectl(1) tool, providing native\n"
40 : "command line compatibility with the resolvconf(8) tool of various Linux\n"
41 : "distributions and BSD systems. Some options supported by other implementations\n"
42 : "are not supported and are ignored: -m, -p. Various options supported by other\n"
43 : "implementations are not supported and will cause the invocation to fail: -u,\n"
44 : "-I, -i, -l, -R, -r, -v, -V, --enable-updates, --disable-updates,\n"
45 : "--updates-are-enabled.\n"
46 : "\nSee the %2$s for details.\n"
47 : , program_invocation_short_name
48 : , link
49 : );
50 :
51 0 : return 0;
52 : }
53 :
54 0 : static int parse_nameserver(const char *string) {
55 : int r;
56 :
57 0 : assert(string);
58 :
59 0 : for (;;) {
60 0 : _cleanup_free_ char *word = NULL;
61 :
62 0 : r = extract_first_word(&string, &word, NULL, 0);
63 0 : if (r < 0)
64 0 : return r;
65 0 : if (r == 0)
66 0 : break;
67 :
68 0 : if (strv_push(&arg_set_dns, word) < 0)
69 0 : return log_oom();
70 :
71 0 : word = NULL;
72 : }
73 :
74 0 : return 0;
75 : }
76 :
77 0 : static int parse_search_domain(const char *string) {
78 : int r;
79 :
80 0 : assert(string);
81 :
82 0 : for (;;) {
83 0 : _cleanup_free_ char *word = NULL;
84 :
85 0 : r = extract_first_word(&string, &word, NULL, EXTRACT_UNQUOTE);
86 0 : if (r < 0)
87 0 : return r;
88 0 : if (r == 0)
89 0 : break;
90 :
91 0 : if (strv_push(&arg_set_domain, word) < 0)
92 0 : return log_oom();
93 :
94 0 : word = NULL;
95 : }
96 :
97 0 : return 0;
98 : }
99 :
100 0 : int resolvconf_parse_argv(int argc, char *argv[]) {
101 :
102 : enum {
103 : ARG_VERSION = 0x100,
104 : ARG_ENABLE_UPDATES,
105 : ARG_DISABLE_UPDATES,
106 : ARG_UPDATES_ARE_ENABLED,
107 : };
108 :
109 : static const struct option options[] = {
110 : { "help", no_argument, NULL, 'h' },
111 : { "version", no_argument, NULL, ARG_VERSION },
112 :
113 : /* The following are specific to Debian's original resolvconf */
114 : { "enable-updates", no_argument, NULL, ARG_ENABLE_UPDATES },
115 : { "disable-updates", no_argument, NULL, ARG_DISABLE_UPDATES },
116 : { "updates-are-enabled", no_argument, NULL, ARG_UPDATES_ARE_ENABLED },
117 : {}
118 : };
119 :
120 : enum {
121 : TYPE_REGULAR,
122 : TYPE_PRIVATE, /* -p: Not supported, treated identically to TYPE_REGULAR */
123 : TYPE_EXCLUSIVE, /* -x */
124 0 : } type = TYPE_REGULAR;
125 :
126 : int c, r;
127 :
128 0 : assert(argc >= 0);
129 0 : assert(argv);
130 :
131 : /* openresolv checks these environment variables */
132 0 : if (getenv("IF_EXCLUSIVE"))
133 0 : type = TYPE_EXCLUSIVE;
134 0 : if (getenv("IF_PRIVATE"))
135 0 : type = TYPE_PRIVATE; /* not actually supported */
136 :
137 0 : arg_mode = _MODE_INVALID;
138 :
139 0 : while ((c = getopt_long(argc, argv, "hadxpfm:uIi:l:Rr:vV", options, NULL)) >= 0)
140 0 : switch(c) {
141 :
142 0 : case 'h':
143 0 : return resolvconf_help();
144 :
145 0 : case ARG_VERSION:
146 0 : return version();
147 :
148 : /* -a and -d is what everybody can agree on */
149 0 : case 'a':
150 0 : arg_mode = MODE_SET_LINK;
151 0 : break;
152 :
153 0 : case 'd':
154 0 : arg_mode = MODE_REVERT_LINK;
155 0 : break;
156 :
157 : /* The exclusive/private/force stuff is an openresolv invention, we support in some skewed way */
158 0 : case 'x':
159 0 : type = TYPE_EXCLUSIVE;
160 0 : break;
161 :
162 0 : case 'p':
163 0 : type = TYPE_PRIVATE; /* not actually supported */
164 0 : break;
165 :
166 0 : case 'f':
167 0 : arg_ifindex_permissive = true;
168 0 : break;
169 :
170 : /* The metrics stuff is an openresolv invention we ignore (and don't really need) */
171 0 : case 'm':
172 0 : log_debug("Switch -%c ignored.", c);
173 0 : break;
174 :
175 : /* Everybody else can agree on the existence of -u but we don't support it. */
176 0 : case 'u':
177 :
178 : /* The following options are openresolv inventions we don't support. */
179 : case 'I':
180 : case 'i':
181 : case 'l':
182 : case 'R':
183 : case 'r':
184 : case 'v':
185 : case 'V':
186 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
187 : "Switch -%c not supported.", c);
188 :
189 : /* The Debian resolvconf commands we don't support. */
190 0 : case ARG_ENABLE_UPDATES:
191 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
192 : "Switch --enable-updates not supported.");
193 0 : case ARG_DISABLE_UPDATES:
194 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
195 : "Switch --disable-updates not supported.");
196 0 : case ARG_UPDATES_ARE_ENABLED:
197 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
198 : "Switch --updates-are-enabled not supported.");
199 :
200 0 : case '?':
201 0 : return -EINVAL;
202 :
203 0 : default:
204 0 : assert_not_reached("Unhandled option");
205 : }
206 :
207 0 : if (arg_mode == _MODE_INVALID)
208 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
209 : "Expected either -a or -d on the command line.");
210 :
211 0 : if (optind+1 != argc)
212 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
213 : "Expected interface name as argument.");
214 :
215 0 : r = ifname_mangle(argv[optind]);
216 0 : if (r <= 0)
217 0 : return r;
218 :
219 0 : optind++;
220 :
221 0 : if (arg_mode == MODE_SET_LINK) {
222 0 : unsigned n = 0;
223 :
224 0 : for (;;) {
225 0 : _cleanup_free_ char *line = NULL;
226 : const char *a, *l;
227 :
228 0 : r = read_line(stdin, LONG_LINE_MAX, &line);
229 0 : if (r < 0)
230 0 : return log_error_errno(r, "Failed to read from stdin: %m");
231 0 : if (r == 0)
232 0 : break;
233 :
234 0 : n++;
235 :
236 0 : l = strstrip(line);
237 0 : if (IN_SET(*l, '#', ';', 0))
238 0 : continue;
239 :
240 0 : a = first_word(l, "nameserver");
241 0 : if (a) {
242 0 : (void) parse_nameserver(a);
243 0 : continue;
244 : }
245 :
246 0 : a = first_word(l, "domain");
247 0 : if (!a)
248 0 : a = first_word(l, "search");
249 0 : if (a) {
250 0 : (void) parse_search_domain(a);
251 0 : continue;
252 : }
253 :
254 0 : log_syntax(NULL, LOG_DEBUG, "stdin", n, 0, "Ignoring resolv.conf line: %s", l);
255 : }
256 :
257 0 : if (type == TYPE_EXCLUSIVE) {
258 :
259 : /* If -x mode is selected, let's preferably route non-suffixed lookups to this interface. This
260 : * somewhat matches the original -x behaviour */
261 :
262 0 : r = strv_extend(&arg_set_domain, "~.");
263 0 : if (r < 0)
264 0 : return log_oom();
265 :
266 0 : } else if (type == TYPE_PRIVATE)
267 0 : log_debug("Private DNS server data not supported, ignoring.");
268 :
269 0 : if (!arg_set_dns)
270 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
271 : "No DNS servers specified, refusing operation.");
272 : }
273 :
274 0 : return 1; /* work to do */
275 : }
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