+++ /dev/null
-/*
- * Copyright (C) 2018 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <grp.h>
-#include <pwd.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "tracker.h"
-#include <common/defaults.h>
-#include <common/error.h>
-#include <common/hashtable/hashtable.h>
-#include <common/hashtable/utils.h>
-#include <lttng/lttng-error.h>
-#include <lttng/tracker-internal.h>
-
-#define FALLBACK_USER_BUFLEN 16384
-#define FALLBACK_GROUP_BUFLEN 16384
-
-struct lttng_tracker_list *lttng_tracker_list_create(void)
-{
- struct lttng_tracker_list *t;
-
- t = zmalloc(sizeof(*t));
- if (!t) {
- return NULL;
- }
- t->ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0,
- CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL);
- if (!t->ht) {
- goto error;
- }
- CDS_INIT_LIST_HEAD(&t->list_head);
- t->state = LTTNG_TRACK_ALL;
- return t;
-
-error:
- free(t);
- return NULL;
-}
-
-static int match_tracker_key(struct cds_lfht_node *node, const void *key)
-{
- const struct lttng_tracker_id *tracker_key = key;
- struct lttng_tracker_list_node *tracker_node;
-
- tracker_node = caa_container_of(
- node, struct lttng_tracker_list_node, ht_node);
-
- return lttng_tracker_id_is_equal(tracker_node->id, tracker_key);
-}
-
-static unsigned long hash_tracker_key(
- const struct lttng_tracker_id *tracker_key)
-{
- unsigned long key_hash = 0;
- int value;
- const char *string;
- enum lttng_tracker_id_type type;
-
- /* We do not care for invalid state during hash computation */
- type = lttng_tracker_id_get_type(tracker_key);
- (void) lttng_tracker_id_get_value(tracker_key, &value);
- (void) lttng_tracker_id_get_string(tracker_key, &string);
-
- switch (type) {
- case LTTNG_ID_ALL:
- break;
- case LTTNG_ID_VALUE:
- key_hash ^= hash_key_ulong(
- (void *) (unsigned long) value, lttng_ht_seed);
- break;
- case LTTNG_ID_STRING:
- key_hash ^= hash_key_str(string, lttng_ht_seed);
- break;
- case LTTNG_ID_UNKNOWN:
- break;
- }
- key_hash ^= hash_key_ulong(
- (void *) (unsigned long) type, lttng_ht_seed);
- return key_hash;
-}
-
-static struct lttng_tracker_id **lttng_tracker_list_lookup(
- const struct lttng_tracker_list *tracker_list,
- const struct lttng_tracker_id *key)
-{
- struct lttng_tracker_list_node *list_node;
- struct cds_lfht_iter iter;
- struct cds_lfht_node *node;
-
- cds_lfht_lookup(tracker_list->ht, hash_tracker_key(key),
- match_tracker_key, key, &iter);
- node = cds_lfht_iter_get_node(&iter);
- if (!node) {
- return NULL;
- }
- list_node = caa_container_of(
- node, struct lttng_tracker_list_node, ht_node);
- return &list_node->id;
-}
-
-static void destroy_list_node_rcu(struct rcu_head *head)
-{
- struct lttng_tracker_list_node *n = caa_container_of(
- head, struct lttng_tracker_list_node, rcu_head);
-
- lttng_tracker_id_destroy(n->id);
- free(n);
-}
-
-static void _lttng_tracker_list_remove(struct lttng_tracker_list *tracker_list,
- struct lttng_tracker_list_node *n)
-{
- cds_list_del(&n->list_node);
-
- rcu_read_lock();
- cds_lfht_del(tracker_list->ht, &n->ht_node);
- rcu_read_unlock();
-
- call_rcu(&n->rcu_head, destroy_list_node_rcu);
-}
-
-static void lttng_tracker_list_reset(struct lttng_tracker_list *tracker_list)
-{
- struct lttng_tracker_list_node *n, *t;
-
- cds_list_for_each_entry_safe (
- n, t, &tracker_list->list_head, list_node) {
- _lttng_tracker_list_remove(tracker_list, n);
- }
- tracker_list->state = LTTNG_TRACK_ALL;
-}
-
-/* Protected by session mutex held by caller. */
-int lttng_tracker_list_add(struct lttng_tracker_list *tracker_list,
- const struct lttng_tracker_id *_id)
-{
- struct lttng_tracker_id **id;
- struct lttng_tracker_list_node *n = NULL;
- int ret;
-
- if (lttng_tracker_id_get_type(_id) == LTTNG_ID_ALL) {
- /* Track all, so remove each individual item. */
- lttng_tracker_list_reset(tracker_list);
- ret = LTTNG_OK;
- goto error;
- }
- rcu_read_lock();
- id = lttng_tracker_list_lookup(tracker_list, _id);
- /*
- * It is okay to release the RCU read lock here since id is only checked
- * for != NULL and not dereferenced.
- */
- rcu_read_unlock();
- if (id) {
- ret = LTTNG_ERR_ID_TRACKED;
- goto error;
- }
- n = zmalloc(sizeof(*n));
- if (!n) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- n->id = lttng_tracker_id_duplicate(_id);
- if (!n->id) {
- ret = LTTNG_ERR_NOMEM;
- goto error;
- }
-
- cds_list_add_tail(&n->list_node, &tracker_list->list_head);
- tracker_list->state = LTTNG_TRACK_LIST;
-
- rcu_read_lock();
- cds_lfht_add(tracker_list->ht, hash_tracker_key(n->id), &n->ht_node);
- rcu_read_unlock();
-
- return LTTNG_OK;
-
-error:
- free(n);
- return ret;
-}
-
-/*
- * Lookup and remove.
- * Protected by session mutex held by caller.
- */
-int lttng_tracker_list_remove(struct lttng_tracker_list *tracker_list,
- const struct lttng_tracker_id *_id)
-{
- enum lttng_error_code ret = LTTNG_OK;
- struct lttng_tracker_id **id;
- struct lttng_tracker_list_node *n;
-
- if (lttng_tracker_id_get_type(_id) == LTTNG_ID_ALL) {
- /* Untrack all. */
- lttng_tracker_list_reset(tracker_list);
- /* Set state to "track none". */
- tracker_list->state = LTTNG_TRACK_NONE;
- goto end;
- }
-
- rcu_read_lock();
- id = lttng_tracker_list_lookup(tracker_list, _id);
- if (!id) {
- ret = LTTNG_ERR_ID_NOT_TRACKED;
- goto rcu_unlock;
- }
-
- n = caa_container_of(id, struct lttng_tracker_list_node, id);
- _lttng_tracker_list_remove(tracker_list, n);
-
-rcu_unlock:
- rcu_read_unlock();
-end:
- return ret;
-}
-
-void lttng_tracker_list_destroy(struct lttng_tracker_list *tracker_list)
-{
- int ret;
-
- if (!tracker_list) {
- return;
- }
- lttng_tracker_list_reset(tracker_list);
- ret = cds_lfht_destroy(tracker_list->ht, NULL);
- assert(!ret);
- free(tracker_list);
-}
-
-static int lttng_lookup_user(const char *username, int *result)
-{
- struct passwd p, *pres;
- int ret, retval = LTTNG_OK;
- char *buf = NULL;
- ssize_t buflen;
-
- buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
- if (buflen < 0) {
- buflen = FALLBACK_USER_BUFLEN;
- }
- buf = zmalloc(buflen);
- if (!buf) {
- retval = LTTNG_ERR_NOMEM;
- goto end;
- }
- for (;;) {
- ret = getpwnam_r(username, &p, buf, buflen, &pres);
- switch (ret) {
- case EINTR:
- continue;
- case ERANGE:
- buflen *= 2;
- free(buf);
- buf = zmalloc(buflen);
- if (!buf) {
- retval = LTTNG_ERR_NOMEM;
- goto end;
- }
- continue;
- default:
- goto end_loop;
- }
- }
-end_loop:
-
- switch (ret) {
- case 0:
- if (pres == NULL) {
- retval = LTTNG_ERR_USER_NOT_FOUND;
- } else {
- *result = (int) p.pw_uid;
- DBG("Lookup of tracker UID/VUID: name '%s' maps to id %d.",
- username, *result);
- retval = LTTNG_OK;
- }
- break;
- case ENOENT:
- case ESRCH:
- case EBADF:
- case EPERM:
- retval = LTTNG_ERR_USER_NOT_FOUND;
- break;
- default:
- retval = LTTNG_ERR_NOMEM;
- }
-end:
- free(buf);
- return retval;
-}
-
-static int lttng_lookup_group(const char *groupname, int *result)
-{
- struct group g, *gres;
- int ret, retval = LTTNG_OK;
- char *buf = NULL;
- ssize_t buflen;
-
- buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
- if (buflen < 0) {
- buflen = FALLBACK_GROUP_BUFLEN;
- }
- buf = zmalloc(buflen);
- if (!buf) {
- retval = LTTNG_ERR_NOMEM;
- goto end;
- }
- for (;;) {
- ret = getgrnam_r(groupname, &g, buf, buflen, &gres);
- switch (ret) {
- case EINTR:
- continue;
- case ERANGE:
- buflen *= 2;
- free(buf);
- buf = zmalloc(buflen);
- if (!buf) {
- retval = LTTNG_ERR_NOMEM;
- goto end;
- }
- continue;
- default:
- goto end_loop;
- }
- }
-end_loop:
-
- switch (ret) {
- case 0:
- if (gres == NULL) {
- retval = LTTNG_ERR_GROUP_NOT_FOUND;
- } else {
- *result = (int) g.gr_gid;
- DBG("Lookup of tracker GID/GUID: name '%s' maps to id %d.",
- groupname, *result);
- retval = LTTNG_OK;
- }
- break;
- case ENOENT:
- case ESRCH:
- case EBADF:
- case EPERM:
- retval = LTTNG_ERR_GROUP_NOT_FOUND;
- break;
- default:
- retval = LTTNG_ERR_NOMEM;
- }
-end:
- free(buf);
- return retval;
-}
-
-int lttng_tracker_id_lookup_string(enum lttng_tracker_type tracker_type,
- const struct lttng_tracker_id *id,
- int *result)
-{
- enum lttng_tracker_id_status status;
- int value;
- const char *string;
-
- switch (lttng_tracker_id_get_type(id)) {
- case LTTNG_ID_ALL:
- *result = -1;
- return LTTNG_OK;
- case LTTNG_ID_VALUE:
- status = lttng_tracker_id_get_value(id, &value);
- if (status != LTTNG_TRACKER_ID_STATUS_OK) {
- return LTTNG_ERR_INVALID;
- }
- *result = id->value;
- return LTTNG_OK;
- case LTTNG_ID_STRING:
- status = lttng_tracker_id_get_string(id, &string);
- if (status != LTTNG_TRACKER_ID_STATUS_OK) {
- return LTTNG_ERR_INVALID;
- }
- switch (tracker_type) {
- case LTTNG_TRACKER_PID:
- case LTTNG_TRACKER_VPID:
- ERR("Lookup of tracker PID/VPID by name unsupported.");
- return LTTNG_ERR_INVALID;
- case LTTNG_TRACKER_UID:
- case LTTNG_TRACKER_VUID:
- DBG("Lookup of tracker UID/VUID by name.");
- return lttng_lookup_user(string, result);
- case LTTNG_TRACKER_GID:
- case LTTNG_TRACKER_VGID:
- DBG("Lookup of tracker GID/VGID by name.");
- return lttng_lookup_group(string, result);
- default:
- return LTTNG_ERR_INVALID;
- }
- break;
- default:
- return LTTNG_ERR_INVALID;
- }
-}
-
-/*
- * Protected by session mutex held by caller.
- * On success, _ids and the ids it contains must be freed by the caller.
- */
-int lttng_tracker_id_get_list(const struct lttng_tracker_list *tracker_list,
- struct lttng_tracker_ids **_ids)
-{
- int retval = LTTNG_OK, ret;
- struct lttng_tracker_list_node *n;
- ssize_t count = 0, i = 0;
- struct lttng_tracker_ids *ids = NULL;
- struct lttng_tracker_id *id;
- enum lttng_tracker_id_status status;
-
- switch (tracker_list->state) {
- case LTTNG_TRACK_LIST:
- cds_list_for_each_entry (
- n, &tracker_list->list_head, list_node) {
- count++;
- }
- ids = lttng_tracker_ids_create(count);
- if (ids == NULL) {
- PERROR("Failed to allocate tracked ID list");
- retval = -LTTNG_ERR_NOMEM;
- goto end;
- }
- cds_list_for_each_entry (
- n, &tracker_list->list_head, list_node) {
- id = lttng_tracker_ids_get_pointer_of_index(ids, i);
- if (!id) {
- retval = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- ret = lttng_tracker_id_copy(id, n->id);
- if (ret) {
- retval = -LTTNG_ERR_NOMEM;
- goto error;
- }
- i++;
- }
- break;
- case LTTNG_TRACK_ALL:
-
- ids = lttng_tracker_ids_create(1);
- if (ids == NULL) {
- PERROR("Failed to allocate tracked ID list");
- retval = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- id = lttng_tracker_ids_get_pointer_of_index(ids, 0);
- status = lttng_tracker_id_set_all(id);
- if (status != LTTNG_TRACKER_ID_STATUS_OK) {
- ERR("Invalid tracker id for track all");
- retval = -LTTNG_ERR_INVALID;
- goto error;
- }
- break;
- case LTTNG_TRACK_NONE:
- /* No ids track, so we return 0 element collection. */
- ids = lttng_tracker_ids_create(0);
- if (ids == NULL) {
- PERROR("alloc list ids");
- retval = -LTTNG_ERR_NOMEM;
- goto end;
- }
- break;
- }
- *_ids = ids;
-
-end:
- return retval;
-
-error:
- lttng_tracker_ids_destroy(ids);
- return retval;
-}
-
-int lttng_tracker_id_set_list(struct lttng_tracker_list *tracker_list,
- const struct lttng_tracker_ids *ids)
-{
- unsigned int i, count;
- const struct lttng_tracker_id *id;
- enum lttng_tracker_id_status status;
-
- assert(tracker_list);
- assert(ids);
-
- lttng_tracker_list_reset(tracker_list);
-
- status = lttng_tracker_ids_get_count(ids, &count);
- if (status != LTTNG_TRACKER_ID_STATUS_OK) {
- return LTTNG_ERR_INVALID;
- }
-
- if (count == 0) {
- /* Set state to "track none". */
- tracker_list->state = LTTNG_TRACK_NONE;
- return LTTNG_OK;
- }
-
- if (count == 1) {
- id = lttng_tracker_ids_get_at_index(ids, 0);
- if (lttng_tracker_id_get_type(id) == LTTNG_ID_ALL) {
- /* Track all. */
- return LTTNG_OK;
- }
- }
-
- for (i = 0; i < count; i++) {
- int ret;
- id = lttng_tracker_ids_get_at_index(ids, i);
- ret = lttng_tracker_list_add(tracker_list, id);
- if (ret != LTTNG_OK) {
- return ret;
- }
- }
- return LTTNG_OK;
-}
projects / lttng-tools.git / blobdiff