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/* SPDX-License-Identifier: LGPL-2.1+ */
#include "alloc-util.h"
#include "naming-scheme.h"
#include "proc-cmdline.h"
#include "string-util.h"
static const NamingScheme naming_schemes[] = {
{ "v238", NAMING_V238 },
{ "v239", NAMING_V239 },
{ "v240", NAMING_V240 },
/* … add more schemes here, as the logic to name devices is updated … */
};
static const NamingScheme* naming_scheme_from_name(const char *name) {
size_t i;
if (streq(name, "latest"))
return naming_schemes + ELEMENTSOF(naming_schemes) - 1;
for (i = 0; i < ELEMENTSOF(naming_schemes); i++)
if (streq(naming_schemes[i].name, name))
return naming_schemes + i;
return NULL;
}
const NamingScheme* naming_scheme(void) {
static const NamingScheme *cache = NULL;
_cleanup_free_ char *buffer = NULL;
const char *e, *k;
if (cache)
return cache;
/* Acquire setting from the kernel command line */
(void) proc_cmdline_get_key("net.naming-scheme", 0, &buffer);
/* Also acquire it from an env var */
e = getenv("NET_NAMING_SCHEME");
if (e) {
if (*e == ':') {
/* If prefixed with ':' the kernel cmdline takes precedence */
k = buffer ?: e + 1;
} else
k = e; /* Otherwise the env var takes precedence */
} else
k = buffer;
if (k) {
cache = naming_scheme_from_name(k);
if (cache) {
log_info("Using interface naming scheme '%s'.", cache->name);
return cache;
}
log_warning("Unknown interface naming scheme '%s' requested, ignoring.", k);
}
cache = naming_scheme_from_name(DEFAULT_NET_NAMING_SCHEME);
assert(cache);
log_info("Using default interface naming scheme '%s'.", cache->name);
return cache;
}
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