| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <getopt.h> |
| #include <net/if.h> |
| |
| #include "alloc-util.h" |
| #include "def.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("Unhandled option"); |
| } |
| |
| 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, *l; |
| |
| r = read_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++; |
| |
| l = strstrip(line); |
| if (IN_SET(*l, '#', ';', 0)) |
| continue; |
| |
| a = first_word(l, "nameserver"); |
| if (a) { |
| (void) parse_nameserver(a); |
| continue; |
| } |
| |
| a = first_word(l, "domain"); |
| if (!a) |
| a = first_word(l, "search"); |
| if (a) { |
| (void) parse_search_domain(a); |
| continue; |
| } |
| |
| log_syntax(NULL, LOG_DEBUG, "stdin", n, 0, "Ignoring resolv.conf line: %s", l); |
| } |
| |
| 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 */ |
| } |
