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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <getopt.h>
#include "build.h"
#include "fd-util.h"
#include "fs-util.h"
#include "generator.h"
#include "macro.h"
#include "main-func.h"
#include "mkdir.h"
#include "network-generator.h"
#include "path-util.h"
#include "proc-cmdline.h"
#define NETWORKD_UNIT_DIRECTORY "/run/systemd/network"
static const char *arg_root = NULL;
static int network_save(Network *network, const char *dest_dir) {
_cleanup_(unlink_and_freep) char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(network);
r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path);
if (r < 0)
return r;
network_dump(network, f);
if (asprintf(&p, "%s/%s-%s.network",
dest_dir,
isempty(network->ifname) ? "71" : "70",
isempty(network->ifname) ? "default" : network->ifname) < 0)
return log_oom();
r = conservative_rename(temp_path, p);
if (r < 0)
return r;
temp_path = mfree(temp_path);
return 0;
}
static int netdev_save(NetDev *netdev, const char *dest_dir) {
_cleanup_(unlink_and_freep) char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(netdev);
r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path);
if (r < 0)
return r;
netdev_dump(netdev, f);
if (asprintf(&p, "%s/70-%s.netdev", dest_dir, netdev->ifname) < 0)
return log_oom();
r = conservative_rename(temp_path, p);
if (r < 0)
return r;
temp_path = mfree(temp_path);
return 0;
}
static int link_save(Link *link, const char *dest_dir) {
_cleanup_(unlink_and_freep) char *temp_path = NULL;
_cleanup_fclose_ FILE *f = NULL;
_cleanup_free_ char *p = NULL;
int r;
assert(link);
r = generator_open_unit_file_full(dest_dir, NULL, NULL, &f, &temp_path);
if (r < 0)
return r;
link_dump(link, f);
if (asprintf(&p, "%s/%s-%s.link",
dest_dir,
!isempty(link->ifname) ? "70" : !hw_addr_is_null(&link->mac) ? "71" : "72",
link->filename) < 0)
return log_oom();
r = conservative_rename(temp_path, p);
if (r < 0)
return r;
temp_path = mfree(temp_path);
return 0;
}
static int context_save(Context *context) {
Network *network;
NetDev *netdev;
Link *link;
int r;
const char *p = prefix_roota(arg_root, NETWORKD_UNIT_DIRECTORY);
r = mkdir_p(p, 0755);
if (r < 0)
return log_error_errno(r, "Failed to create directory " NETWORKD_UNIT_DIRECTORY ": %m");
HASHMAP_FOREACH(network, context->networks_by_name)
RET_GATHER(r, network_save(network, p));
HASHMAP_FOREACH(netdev, context->netdevs_by_name)
RET_GATHER(r, netdev_save(netdev, p));
HASHMAP_FOREACH(link, context->links_by_filename)
RET_GATHER(r, link_save(link, p));
return r;
}
static int help(void) {
printf("%s [OPTIONS...] [-- KERNEL_CMDLINE]\n"
" -h --help Show this help\n"
" --version Show package version\n"
" --root=PATH Operate on an alternate filesystem root\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_ROOT,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "root", required_argument, NULL, ARG_ROOT },
{},
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_ROOT:
arg_root = optarg;
break;
case '?':
return -EINVAL;
default:
assert_not_reached();
}
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_(context_clear) Context context = {};
int r;
log_setup();
umask(0022);
r = parse_argv(argc, argv);
if (r <= 0)
return r;
if (optind >= argc) {
r = proc_cmdline_parse(parse_cmdline_item, &context, 0);
if (r < 0)
return log_warning_errno(r, "Failed to parse kernel command line: %m");
} else {
for (int i = optind; i < argc; i++) {
_cleanup_free_ char *word = NULL;
char *value;
word = strdup(argv[i]);
if (!word)
return log_oom();
value = strchr(word, '=');
if (value)
*(value++) = 0;
r = parse_cmdline_item(word, value, &context);
if (r < 0)
return log_warning_errno(r, "Failed to parse command line \"%s%s%s\": %m",
word, value ? "=" : "", strempty(value));
}
}
r = context_merge_networks(&context);
if (r < 0)
return log_warning_errno(r, "Failed to merge multiple command line options: %m");
return context_save(&context);
}
DEFINE_MAIN_FUNCTION(run);
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