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// SPDX-License-Identifier: GPL-3.0-or-later
#include "apps_plugin.h"
// ----------------------------------------------------------------------------
// read users and groups from files
enum user_or_group_id_type {
USER_ID,
GROUP_ID
};
struct user_or_group_ids {
enum user_or_group_id_type type;
avl_tree_type index;
struct user_or_group_id *root;
char filename[FILENAME_MAX + 1];
};
int user_id_compare(void* a, void* b) {
if(((struct user_or_group_id *)a)->id.uid < ((struct user_or_group_id *)b)->id.uid)
return -1;
else if(((struct user_or_group_id *)a)->id.uid > ((struct user_or_group_id *)b)->id.uid)
return 1;
else
return 0;
}
struct user_or_group_ids all_user_ids = {
.type = USER_ID,
.index = {
NULL,
user_id_compare
},
.root = NULL,
.filename = "",
};
int group_id_compare(void* a, void* b) {
if(((struct user_or_group_id *)a)->id.gid < ((struct user_or_group_id *)b)->id.gid)
return -1;
else if(((struct user_or_group_id *)a)->id.gid > ((struct user_or_group_id *)b)->id.gid)
return 1;
else
return 0;
}
struct user_or_group_ids all_group_ids = {
.type = GROUP_ID,
.index = {
NULL,
group_id_compare
},
.root = NULL,
.filename = "",
};
int file_changed(const struct stat *statbuf __maybe_unused, struct timespec *last_modification_time __maybe_unused) {
#if defined(__APPLE__)
return 0;
#else
if(likely(statbuf->st_mtim.tv_sec == last_modification_time->tv_sec &&
statbuf->st_mtim.tv_nsec == last_modification_time->tv_nsec)) return 0;
last_modification_time->tv_sec = statbuf->st_mtim.tv_sec;
last_modification_time->tv_nsec = statbuf->st_mtim.tv_nsec;
return 1;
#endif
}
int read_user_or_group_ids(struct user_or_group_ids *ids, struct timespec *last_modification_time) {
struct stat statbuf;
if(unlikely(stat(ids->filename, &statbuf)))
return 1;
else
if(likely(!file_changed(&statbuf, last_modification_time))) return 0;
procfile *ff = procfile_open(ids->filename, " :\t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) return 1;
ff = procfile_readall(ff);
if(unlikely(!ff)) return 1;
size_t line, lines = procfile_lines(ff);
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;
struct user_or_group_id *user_or_group_id = callocz(1, sizeof(struct user_or_group_id));
if(ids->type == USER_ID)
user_or_group_id->id.uid = (uid_t) str2ull(id_string, NULL);
else
user_or_group_id->id.gid = (uid_t) str2ull(id_string, NULL);
user_or_group_id->name = strdupz(name);
user_or_group_id->updated = 1;
struct user_or_group_id *existing_user_id = NULL;
if(likely(ids->root))
existing_user_id = (struct user_or_group_id *)avl_search(&ids->index, (avl_t *) user_or_group_id);
if(unlikely(existing_user_id)) {
freez(existing_user_id->name);
existing_user_id->name = user_or_group_id->name;
existing_user_id->updated = 1;
freez(user_or_group_id);
}
else {
if(unlikely(avl_insert(&ids->index, (avl_t *) user_or_group_id) != (void *) user_or_group_id)) {
netdata_log_error("INTERNAL ERROR: duplicate indexing of id during realloc");
}
user_or_group_id->next = ids->root;
ids->root = user_or_group_id;
}
}
procfile_close(ff);
// remove unused ids
struct user_or_group_id *user_or_group_id = ids->root, *prev_user_id = NULL;
while(user_or_group_id) {
if(unlikely(!user_or_group_id->updated)) {
if(unlikely((struct user_or_group_id *)avl_remove(&ids->index, (avl_t *) user_or_group_id) != user_or_group_id))
netdata_log_error("INTERNAL ERROR: removal of unused id from index, removed a different id");
if(prev_user_id)
prev_user_id->next = user_or_group_id->next;
else
ids->root = user_or_group_id->next;
freez(user_or_group_id->name);
freez(user_or_group_id);
if(prev_user_id)
user_or_group_id = prev_user_id->next;
else
user_or_group_id = ids->root;
}
else {
user_or_group_id->updated = 0;
prev_user_id = user_or_group_id;
user_or_group_id = user_or_group_id->next;
}
}
return 0;
}
struct user_or_group_id *user_id_find(struct user_or_group_id *user_id_to_find) {
if(*netdata_configured_host_prefix) {
static struct timespec last_passwd_modification_time;
int ret = read_user_or_group_ids(&all_user_ids, &last_passwd_modification_time);
if(likely(!ret && all_user_ids.index.root))
return (struct user_or_group_id *)avl_search(&all_user_ids.index, (avl_t *)user_id_to_find);
}
return NULL;
}
struct user_or_group_id *group_id_find(struct user_or_group_id *group_id_to_find) {
if(*netdata_configured_host_prefix) {
static struct timespec last_group_modification_time;
int ret = read_user_or_group_ids(&all_group_ids, &last_group_modification_time);
if(likely(!ret && all_group_ids.index.root))
return (struct user_or_group_id *)avl_search(&all_group_ids.index, (avl_t *) &group_id_to_find);
}
return NULL;
}
void users_and_groups_init(void) {
snprintfz(all_user_ids.filename, FILENAME_MAX, "%s/etc/passwd", netdata_configured_host_prefix);
debug_log("passwd file: '%s'", all_user_ids.filename);
snprintfz(all_group_ids.filename, FILENAME_MAX, "%s/etc/group", netdata_configured_host_prefix);
debug_log("group file: '%s'", all_group_ids.filename);
}
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