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// SPDX-License-Identifier: GPL-3.0-or-later
#include "libnetdata/libnetdata.h"
static bool file_changed(const struct stat *statbuf __maybe_unused, struct timespec *last_modification_time __maybe_unused) {
#if defined(OS_MACOS) || defined(OS_WINDOWS)
return false;
#else
if(likely(statbuf->st_mtim.tv_sec == last_modification_time->tv_sec &&
statbuf->st_mtim.tv_nsec == last_modification_time->tv_nsec)) return false;
last_modification_time->tv_sec = statbuf->st_mtim.tv_sec;
last_modification_time->tv_nsec = statbuf->st_mtim.tv_nsec;
return true;
#endif
}
static size_t read_passwd_or_group(const char *filename, struct timespec *last_modification_time, void (*cb)(uint32_t gid, const char *name, uint32_t version), uint32_t version) {
struct stat statbuf;
if(unlikely(stat(filename, &statbuf) || !file_changed(&statbuf, last_modification_time)))
return 0;
procfile *ff = procfile_open(filename, " :\t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) return 0;
ff = procfile_readall(ff);
if(unlikely(!ff)) return 0;
size_t line, lines = procfile_lines(ff);
size_t added = 0;
for(line = 0; line < lines ;line++) {
size_t words = procfile_linewords(ff, line);
if(unlikely(words < 3)) continue;
char *name = procfile_lineword(ff, line, 0);
if(unlikely(!name || !*name)) continue;
char *id_string = procfile_lineword(ff, line, 2);
if(unlikely(!id_string || !*id_string)) continue;
uint32_t id = str2ull(id_string, NULL);
cb(id, name, version);
added++;
}
procfile_close(ff);
return added;
}
void update_cached_host_users(void) {
if(!netdata_configured_host_prefix || !*netdata_configured_host_prefix) return;
static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
if(!spinlock_trylock(&spinlock)) return;
char filename[FILENAME_MAX];
static bool initialized = false;
size_t added = 0;
if(!initialized) {
initialized = true;
cached_usernames_init();
}
static uint32_t passwd_version = 0;
static struct timespec passwd_ts = { 0 };
snprintfz(filename, FILENAME_MAX, "%s/etc/passwd", netdata_configured_host_prefix);
added = read_passwd_or_group(filename, &passwd_ts, cached_username_populate_by_uid, ++passwd_version);
if(added) cached_usernames_delete_old_versions(passwd_version);
spinlock_unlock(&spinlock);
}
void update_cached_host_groups(void) {
if(!netdata_configured_host_prefix || !*netdata_configured_host_prefix) return;
static SPINLOCK spinlock = NETDATA_SPINLOCK_INITIALIZER;
if(!spinlock_trylock(&spinlock)) return;
char filename[FILENAME_MAX];
static bool initialized = false;
size_t added = 0;
if(!initialized) {
initialized = true;
cached_groupnames_init();
}
static uint32_t group_version = 0;
static struct timespec group_ts = { 0 };
snprintfz(filename, FILENAME_MAX, "%s/etc/group", netdata_configured_host_prefix);
added = read_passwd_or_group(filename, &group_ts, cached_groupname_populate_by_gid, ++group_version);
if(added) cached_groupnames_delete_old_versions(group_version);
spinlock_unlock(&spinlock);
}
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