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01e6465b558570d2e33ebeb514b39cedde96014f
systemd/src/network/networkctl.c
T
Yu Watanabe 6cbf8222ca networkctl: add dhcp-lease verb to dump DHCP lease 
This shows the DHCP message of an acquired DHCP lease.
Example:
```
$ networkctl dhcp-lease eth0
Header:
              KEY VALUE
   Hardware Type: ETHER
Hardware Address: 41:42:43:31:32:33
  Client Address: 192.0.2.123
  Server Address: 192.0.2.1

Options:
CODE NAME               DATA
   1 subnet mask        255.255.255.0
   3 router             192.0.2.1
   6 domain name server 192.0.2.1
  12 hostname           test-node
  15 domain name        lan
  28 broadcast address  192.0.2.255
  42 NTP server         192.0.2.11
                        192.0.2.12
  51 lease time         1d
  53 message type       5
  54 server identifier  192.0.2.1
  58 renewal time       11h 5min 38s
  59 rebinding time     20h 5min 38s
 119 domain search      hoge.example.com
                        foo.example.com
```
2026-05-17 21:02:20 +09:00

223 lines
8.3 KiB
C
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "sd-json.h"
#include "alloc-util.h"
#include "build.h"
#include "format-table.h"
#include "help-util.h"
#include "log.h"
#include "logs-show.h"
#include "main-func.h"
#include "networkctl.h"
#include "networkctl-address-label.h"
#include "networkctl-config-file.h"
#include "networkctl-dhcp-lease.h"
#include "networkctl-list.h"
#include "networkctl-lldp.h"
#include "networkctl-misc.h"
#include "networkctl-status-link.h"
#include "options.h"
#include "parse-argument.h"
#include "parse-util.h"
#include "path-util.h"
#include "string-util.h"
#include "verbs.h"
PagerFlags arg_pager_flags = 0;
bool arg_legend = true;
bool arg_no_reload = false;
bool arg_all = false;
bool arg_stats = false;
bool arg_full = false;
bool arg_runtime = false;
bool arg_stdin = false;
unsigned arg_lines = 10;
char *arg_drop_in = NULL;
sd_json_format_flags_t arg_json_format_flags = SD_JSON_FORMAT_OFF;
bool arg_ask_password = true;
STATIC_DESTRUCTOR_REGISTER(arg_drop_in, freep);
VERB_SCOPE(, verb_list_links, "list", "[PATTERN...]", VERB_ANY, VERB_ANY, VERB_DEFAULT|VERB_ONLINE_ONLY,
"List links");
VERB_SCOPE(, verb_link_status, "status", "[PATTERN...]", VERB_ANY, VERB_ANY, VERB_ONLINE_ONLY,
"Show link status");
VERB_SCOPE(, verb_dhcp_lease, "dhcp-lease", "INTERFACE [CODE[:FORMAT]...]", 2, VERB_ANY, VERB_ONLINE_ONLY,
"Show DHCP lease");
VERB_SCOPE(, verb_link_lldp_status, "lldp", "[PATTERN...]", VERB_ANY, VERB_ANY, 0,
"Show LLDP neighbors");
VERB_SCOPE(, verb_list_address_labels, "label", NULL, 1, 1, 0,
"Show current address label entries in the kernel");
VERB_SCOPE(, verb_link_delete, "delete", "DEVICES...", 2, VERB_ANY, 0,
"Delete virtual netdevs");
VERB_SCOPE(, verb_link_varlink_simple_method, "up", "DEVICES...", 2, VERB_ANY, 0,
"Bring devices up");
VERB_SCOPE(, verb_link_varlink_simple_method, "down", "DEVICES...", 2, VERB_ANY, 0,
"Bring devices down");
VERB_SCOPE(, verb_link_varlink_simple_method, "renew", "DEVICES...", 2, VERB_ANY, VERB_ONLINE_ONLY,
"Renew dynamic configurations");
VERB_SCOPE(, verb_link_varlink_simple_method, "forcerenew", "DEVICES...", 2, VERB_ANY, VERB_ONLINE_ONLY,
"Trigger DHCP reconfiguration of all connected clients");
VERB_SCOPE(, verb_link_varlink_simple_method, "reconfigure", "DEVICES...", 2, VERB_ANY, VERB_ONLINE_ONLY,
"Reconfigure interfaces");
VERB_SCOPE(, verb_reload, "reload", NULL, 1, 1, VERB_ONLINE_ONLY,
"Reload .network and .netdev files");
VERB_SCOPE(, verb_edit, "edit", "FILES|DEVICES...", 2, VERB_ANY, 0,
"Edit network configuration files");
VERB_SCOPE(, verb_cat, "cat", "[FILES|DEVICES...]", 1, VERB_ANY, 0,
"Show network configuration files");
VERB_SCOPE(, verb_mask, "mask", "FILES...", 2, VERB_ANY, 0,
"Mask network configuration files");
VERB_SCOPE(, verb_unmask, "unmask", "FILES...", 2, VERB_ANY, 0,
"Unmask network configuration files");
VERB_SCOPE(, verb_persistent_storage, "persistent-storage", "BOOL", 2, 2, 0,
"Notify systemd-networkd if persistent storage is ready");
static int help(void) {
_cleanup_(table_unrefp) Table *verbs = NULL, *options = NULL;
int r;
r = verbs_get_help_table(&verbs);
if (r < 0)
return r;
r = option_parser_get_help_table(&options);
if (r < 0)
return r;
(void) table_sync_column_widths(0, verbs, options);
help_cmdline("[OPTIONS...] COMMAND");
help_abstract("Query and control the networking subsystem.");
help_section("Commands");
r = table_print_or_warn(verbs);
if (r < 0)
return r;
help_section("Options");
r = table_print_or_warn(options);
if (r < 0)
return r;
help_man_page_reference("networkctl", "1");
return 0;
}
VERB_COMMON_HELP_HIDDEN(help);
static int parse_argv(int argc, char *argv[], char ***remaining_args) {
int r;
assert(argc >= 0);
assert(argv);
assert(remaining_args);
OptionParser opts = { argc, argv };
FOREACH_OPTION_OR_RETURN(c, &opts)
switch (c) {
OPTION_COMMON_HELP:
return help();
OPTION_COMMON_VERSION:
return version();
OPTION_COMMON_NO_PAGER:
arg_pager_flags |= PAGER_DISABLE;
break;
OPTION_COMMON_NO_LEGEND:
arg_legend = false;
break;
OPTION_COMMON_NO_ASK_PASSWORD:
arg_ask_password = false;
break;
OPTION('a', "all", NULL, "Show status for all links"):
arg_all = true;
break;
OPTION('s', "stats", NULL, "Show detailed link statistics"):
arg_stats = true;
break;
OPTION('l', "full", NULL, "Do not ellipsize output"):
arg_full = true;
break;
OPTION('n', "lines", "INTEGER", "Number of journal entries to show"):
r = safe_atou(opts.arg, &arg_lines);
if (r < 0)
return log_error_errno(r, "Failed to parse --lines value '%s': %m", opts.arg);
break;
OPTION_COMMON_JSON:
r = parse_json_argument(opts.arg, &arg_json_format_flags);
if (r <= 0)
return r;
break;
OPTION_LONG("no-reload", NULL,
"Do not reload systemd-networkd or systemd-udevd after editing network config"):
arg_no_reload = true;
break;
OPTION_LONG("drop-in", "NAME",
"Edit specified drop-in instead of main config file"):
if (isempty(opts.arg))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Empty drop-in file name.");
if (!endswith(opts.arg, ".conf")) {
char *conf;
conf = strjoin(opts.arg, ".conf");
if (!conf)
return log_oom();
free_and_replace(arg_drop_in, conf);
} else {
r = free_and_strdup(&arg_drop_in, opts.arg);
if (r < 0)
return log_oom();
}
if (!filename_is_valid(arg_drop_in))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Invalid drop-in file name '%s'.", arg_drop_in);
break;
OPTION_LONG("runtime", NULL, "Edit runtime config files"):
arg_runtime = true;
break;
OPTION_LONG("stdin", NULL, "Read new contents of edited file from stdin"):
arg_stdin = true;
break;
}
*remaining_args = option_parser_get_args(&opts);
return 1;
}
static int run(int argc, char* argv[]) {
char **args = NULL;
int r;
log_setup();
r = parse_argv(argc, argv, &args);
if (r <= 0)
return r;
journal_browse_prepare();
return dispatch_verb(args, NULL);
}
DEFINE_MAIN_FUNCTION(run);
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