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-rw-r--r--src/resolve/resolvconf-compat.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/src/resolve/resolvconf-compat.c b/src/resolve/resolvconf-compat.c
new file mode 100644
index 0000000..bef95c0
--- /dev/null
+++ b/src/resolve/resolvconf-compat.c
@@ -0,0 +1,277 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <getopt.h>
+#include <net/if.h>
+
+#include "alloc-util.h"
+#include "build.h"
+#include "constants.h"
+#include "dns-domain.h"
+#include "extract-word.h"
+#include "fileio.h"
+#include "parse-util.h"
+#include "pretty-print.h"
+#include "resolvconf-compat.h"
+#include "resolvectl.h"
+#include "resolved-def.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+
+static int resolvconf_help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("resolvectl", "1", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%1$s -a INTERFACE < FILE\n"
+ "%1$s -d INTERFACE\n"
+ "\n"
+ "Register DNS server and domain configuration with systemd-resolved.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " -a Register per-interface DNS server and domain data\n"
+ " -d Unregister per-interface DNS server and domain data\n"
+ " -f Ignore if specified interface does not exist\n"
+ " -x Send DNS traffic preferably over this interface\n"
+ "\n"
+ "This is a compatibility alias for the resolvectl(1) tool, providing native\n"
+ "command line compatibility with the resolvconf(8) tool of various Linux\n"
+ "distributions and BSD systems. Some options supported by other implementations\n"
+ "are not supported and are ignored: -m, -p, -u. Various options supported by other\n"
+ "implementations are not supported and will cause the invocation to fail:\n"
+ "-I, -i, -l, -R, -r, -v, -V, --enable-updates, --disable-updates,\n"
+ "--updates-are-enabled.\n"
+ "\nSee the %2$s for details.\n",
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int parse_nameserver(const char *string) {
+ int r;
+
+ assert(string);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&string, &word, NULL, 0);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ if (strv_push(&arg_set_dns, word) < 0)
+ return log_oom();
+
+ word = NULL;
+ }
+
+ return 0;
+}
+
+static int parse_search_domain(const char *string) {
+ int r;
+
+ assert(string);
+
+ for (;;) {
+ _cleanup_free_ char *word = NULL;
+
+ r = extract_first_word(&string, &word, NULL, EXTRACT_UNQUOTE);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ if (strv_push(&arg_set_domain, word) < 0)
+ return log_oom();
+
+ word = NULL;
+ }
+
+ return 0;
+}
+
+int resolvconf_parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_ENABLE_UPDATES,
+ ARG_DISABLE_UPDATES,
+ ARG_UPDATES_ARE_ENABLED,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+
+ /* The following are specific to Debian's original resolvconf */
+ { "enable-updates", no_argument, NULL, ARG_ENABLE_UPDATES },
+ { "disable-updates", no_argument, NULL, ARG_DISABLE_UPDATES },
+ { "updates-are-enabled", no_argument, NULL, ARG_UPDATES_ARE_ENABLED },
+ {}
+ };
+
+ enum {
+ TYPE_REGULAR,
+ TYPE_PRIVATE, /* -p: Not supported, treated identically to TYPE_REGULAR */
+ TYPE_EXCLUSIVE, /* -x */
+ } type = TYPE_REGULAR;
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ /* openresolv checks these environment variables */
+ if (getenv("IF_EXCLUSIVE"))
+ type = TYPE_EXCLUSIVE;
+ if (getenv("IF_PRIVATE"))
+ type = TYPE_PRIVATE; /* not actually supported */
+
+ arg_mode = _MODE_INVALID;
+
+ while ((c = getopt_long(argc, argv, "hadxpfm:uIi:l:Rr:vV", options, NULL)) >= 0)
+ switch (c) {
+
+ case 'h':
+ return resolvconf_help();
+
+ case ARG_VERSION:
+ return version();
+
+ /* -a and -d is what everybody can agree on */
+ case 'a':
+ arg_mode = MODE_SET_LINK;
+ break;
+
+ case 'd':
+ arg_mode = MODE_REVERT_LINK;
+ break;
+
+ /* The exclusive/private/force stuff is an openresolv invention, we support in some skewed way */
+ case 'x':
+ type = TYPE_EXCLUSIVE;
+ break;
+
+ case 'p':
+ type = TYPE_PRIVATE; /* not actually supported */
+ break;
+
+ case 'f':
+ arg_ifindex_permissive = true;
+ break;
+
+ /* The metrics stuff is an openresolv invention we ignore (and don't really need) */
+ case 'm':
+ log_debug("Switch -%c ignored.", c);
+ break;
+
+ /* -u supposedly should "update all subscribers". We have no subscribers, hence let's make
+ this a NOP, and exit immediately, cleanly. */
+ case 'u':
+ log_info("Switch -%c ignored.", c);
+ return 0;
+
+ /* The following options are openresolv inventions we don't support. */
+ case 'I':
+ case 'i':
+ case 'l':
+ case 'R':
+ case 'r':
+ case 'v':
+ case 'V':
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Switch -%c not supported.", c);
+
+ /* The Debian resolvconf commands we don't support. */
+ case ARG_ENABLE_UPDATES:
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Switch --enable-updates not supported.");
+ case ARG_DISABLE_UPDATES:
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Switch --disable-updates not supported.");
+ case ARG_UPDATES_ARE_ENABLED:
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Switch --updates-are-enabled not supported.");
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ if (arg_mode == _MODE_INVALID)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Expected either -a or -d on the command line.");
+
+ if (optind+1 != argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Expected interface name as argument.");
+
+ r = ifname_resolvconf_mangle(argv[optind]);
+ if (r <= 0)
+ return r;
+
+ optind++;
+
+ if (arg_mode == MODE_SET_LINK) {
+ unsigned n = 0;
+
+ for (;;) {
+ _cleanup_free_ char *line = NULL;
+ const char *a;
+
+ r = read_stripped_line(stdin, LONG_LINE_MAX, &line);
+ if (r < 0)
+ return log_error_errno(r, "Failed to read from stdin: %m");
+ if (r == 0)
+ break;
+
+ n++;
+
+ if (IN_SET(*line, '#', ';', 0))
+ continue;
+
+ a = first_word(line, "nameserver");
+ if (a) {
+ (void) parse_nameserver(a);
+ continue;
+ }
+
+ a = first_word(line, "domain");
+ if (!a)
+ a = first_word(line, "search");
+ if (a) {
+ (void) parse_search_domain(a);
+ continue;
+ }
+
+ log_syntax(NULL, LOG_DEBUG, "stdin", n, 0, "Ignoring resolv.conf line: %s", line);
+ }
+
+ if (type == TYPE_EXCLUSIVE) {
+
+ /* If -x mode is selected, let's preferably route non-suffixed lookups to this interface. This
+ * somewhat matches the original -x behaviour */
+
+ r = strv_extend(&arg_set_domain, "~.");
+ if (r < 0)
+ return log_oom();
+
+ } else if (type == TYPE_PRIVATE)
+ log_debug("Private DNS server data not supported, ignoring.");
+
+ if (!arg_set_dns)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "No DNS servers specified, refusing operation.");
+ }
+
+ return 1; /* work to do */
+}
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