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Add cleanup functions #40

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wants to merge 3 commits into from

5 participants

@Tibo-lg

I needed to be able to clean the memory used by evhtp when stopping the server, in order to be able to restart it on fatal errors, and to ease the debugging of my code.

It also fixes the compilation with the EVHTP_DISABLE_SSL_FLAG.

I made some test based on the test.c file. Here are the valgrind results :

WITHOUT THREADING AND SSL

==7057== Memcheck, a memory error detector
==7057== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==7057== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
==7057== Command: ./test
==7057== Parent PID: 4844
==7057==
==7057==
==7057== HEAP SUMMARY:
==7057== in use at exit: 448 bytes in 8 blocks
==7057== total heap usage: 98 allocs, 90 frees, 14,909 bytes allocated
==7057==
==7057== LEAK SUMMARY:
==7057== definitely lost: 0 bytes in 0 blocks
==7057== indirectly lost: 0 bytes in 0 blocks
==7057== possibly lost: 0 bytes in 0 blocks
==7057== still reachable: 448 bytes in 8 blocks
==7057== suppressed: 0 bytes in 0 blocks
==7057== Reachable blocks (those to which a pointer was found) are not shown.
==7057== To see them, rerun with: --leak-check=full --show-reachable=yes
==7057==
==7057== For counts of detected and suppressed errors, rerun with: -v
==7057== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

WITH THREADING :

==7142== Memcheck, a memory error detector
==7142== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==7142== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
==7142== Command: ./test -t
==7142== Parent PID: 4844
==7142==
==7142==
==7142== HEAP SUMMARY:
==7142== in use at exit: 448 bytes in 8 blocks
==7142== total heap usage: 2,266 allocs, 2,258 frees, 392,483 bytes allocated
==7142==
==7142== LEAK SUMMARY:
==7142== definitely lost: 0 bytes in 0 blocks
==7142== indirectly lost: 0 bytes in 0 blocks
==7142== possibly lost: 0 bytes in 0 blocks
==7142== still reachable: 448 bytes in 8 blocks
==7142== suppressed: 0 bytes in 0 blocks
==7142== Reachable blocks (those to which a pointer was found) are not shown.
==7142== To see them, rerun with: --leak-check=full --show-reachable=yes
==7142==
==7142== For counts of detected and suppressed errors, rerun with: -v
==7142== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 4 from 4)

WITH SSL (note that I could not succeed to connect to the server in SSL, I get a handshake error) :

Here there is a definitely lost in the SSL library, I don't know how to clean that better, tried a lot of stuff, but nothing worked.

==7233== Memcheck, a memory error detector
==7233== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
==7233== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for copyright info
==7233== Command: ./test -s HPD_cert.pem
==7233== Parent PID: 4844
==7233==
==7233==
==7233== HEAP SUMMARY:
==7233== in use at exit: 536 bytes in 11 blocks
==7233== total heap usage: 2,794 allocs, 2,783 frees, 135,212 bytes allocated
==7233==
==7233== 24 bytes in 1 blocks are definitely lost in loss record 1 of 10
==7233== at 0x4C28F9F: malloc (vg_replace_malloc.c:236)
==7233== by 0x55299C3: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==7233== by 0x52B10DB: ??? (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)
==7233== by 0x52B2F98: SSL_COMP_get_compression_methods (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)
==7233== by 0x52B80E7: SSL_library_init (in /lib/x86_64-linux-gnu/libssl.so.1.0.0)
==7233== by 0x40ED11: evhtp_ssl_init (evhtp.c:2806)
==7233== by 0x40827E: main (test.c:578)
==7233==
==7233== LEAK SUMMARY:
==7233== definitely lost: 24 bytes in 1 blocks
==7233== indirectly lost: 0 bytes in 0 blocks
==7233== possibly lost: 0 bytes in 0 blocks
==7233== still reachable: 512 bytes in 10 blocks
==7233== suppressed: 0 bytes in 0 blocks
==7233== Reachable blocks (those to which a pointer was found) are not shown.
==7233== To see them, rerun with: --leak-check=full --show-reachable=yes
==7233==
==7233== For counts of detected and suppressed errors, rerun with: -v
==7233== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 4 from 4)'

I think it needs more test and some improvements, but it might be useful to others to be able to cleanup at exit.

@sodabrew

@Tibo-lg does the code from #40 cover your use case? (I'm starting to valgrind some of my libevhtp work, and this is really helpful.)

@Tibo-lg

I'm not sure I understand your question as the code from #40 is the one I submitted. But it makes Valgrind happy. I haven't tried it with the latest version though.

@ellzey
Owner

I'm not sure I understand your question as the code from #40 is the one I submitted. But it makes Valgrind happy. I haven't tried it with the latest version though.

No it doesn't. I have to go back into it before the next release and iterate through all the vhost/aliases and free those resources too.

But I think #40 covers way more, and will probably use a combination of both.

@Tibo-lg

Yeah I probably did not try all the use cases. But it is nice to hear that you are working on it.

@aknarts

Hi, since I am just doing some work on ssl, I can point out some cleaning functions you are missing.

ERR_remove_state(0);
EVP_cleanup();
CRYPTO_cleanup_all_ex_data();
ERR_free_strings();
ENGINE_cleanup();
CONF_modules_unload(1);
CONF_modules_free();
sk_SSL_COMP_free(SSL_COMP_get_compression_methods());

Some are probably missing since I still get "definitely lost: 24 bytes in 1 blocks" but still this should clean it up a bit more.

@PanderMusubi

After a build (in order to get sys/tree.h) please run and fix the risky errors and warning reported by the following command:

splint -I. -I/usr/include/x86_64-linux-gnu -Ihtparse -Ioniguruma -Ievthr -Ibuild/compat +posixstrictlib evhtp.c
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Commits on Apr 11, 2012
  1. @Tibo-lg
  2. @Tibo-lg

    Remove useless line.

    Tibo-lg authored
Commits on Apr 13, 2012
  1. @Tibo-lg

    Free memory

    Tibo-lg authored
This page is out of date. Refresh to see the latest.
Showing with 193 additions and 24 deletions.
  1. +117 −9 evhtp.c
  2. +18 −1 evhtp.h
  3. +7 −7 evthr/evthr.c
  4. +51 −7 test.c
View
126 evhtp.c
@@ -115,6 +115,7 @@ RB_GENERATE(status_code_tree, status_code, entry, status_code_cmp);
RB_INSERT(status_code_tree, &status_code_head, c); \
} while (0)
+
static void
status_code_init(void) {
if (scode_tree_initialized > 0) {
@@ -181,6 +182,24 @@ status_code_init(void) {
scode_tree_initialized = 1;
} /* status_code_init */
+static void
+status_code_deinit(void)
+{
+ struct status_code *c = NULL, *c_next = NULL;
+
+ if( scode_tree_initialized == 0 )
+ return;
+
+ for( c = RB_MIN( status_code_tree, &status_code_head ); c != NULL; c = c_next )
+ {
+ c_next = RB_NEXT( status_code_tree, &status_code_head, c );
+ RB_REMOVE( status_code_tree, &status_code_head, c );
+ free( c );
+ }
+
+ scode_tree_initialized = 0;
+}
+
const char *
status_code_to_str(evhtp_res code) {
struct status_code c;
@@ -218,7 +237,7 @@ static htparse_hooks request_psets = {
.on_msg_complete = _evhtp_request_parser_fini
};
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
static int session_id_context = 1;
static int ssl_num_locks;
static evhtp_mutex_t * ssl_locks;
@@ -1301,7 +1320,7 @@ _evhtp_connection_accept(evbase_t * evbase, evhtp_connection_t * connection) {
return -1;
}
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
if (connection->htp->ssl_ctx != NULL) {
connection->ssl = SSL_new(connection->htp->ssl_ctx);
connection->bev = bufferevent_openssl_socket_new(evbase,
@@ -1315,7 +1334,7 @@ _evhtp_connection_accept(evbase_t * evbase, evhtp_connection_t * connection) {
connection->bev = bufferevent_socket_new(evbase, connection->sock,
BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
end:
#endif
@@ -1369,7 +1388,7 @@ _evhtp_connection_new(evhtp_t * htp, int sock) {
return connection;
}
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
static void
_evhtp_shutdown_eventcb(evbev_t * bev, short events, void * arg) {
}
@@ -1424,6 +1443,8 @@ _evhtp_accept_cb(evserv_t * serv, int fd, struct sockaddr * s, int sl, void * ar
if (!(connection = _evhtp_connection_new(htp, fd))) {
return;
}
+
+ LIST_INSERT_HEAD( htp->connections, connection, next );
connection->saddr = malloc(sl);
memcpy(connection->saddr, s, sl);
@@ -1445,7 +1466,7 @@ _evhtp_accept_cb(evserv_t * serv, int fd, struct sockaddr * s, int sl, void * ar
}
}
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
#ifndef EVHTP_DISABLE_EVTHR
static unsigned long
@@ -2309,6 +2330,12 @@ evhtp_bind_socket(evhtp_t * htp, const char * baddr, uint16_t port, int backlog)
return evhtp_bind_sockaddr(htp, sa, sin_len, backlog);
} /* evhtp_bind_socket */
+void
+evhtp_unbind_socket(evhtp_t *htp)
+{
+ evconnlistener_free(htp->server);
+}
+
evhtp_callbacks_t *
evhtp_callbacks_new(unsigned int buckets) {
evhtp_callbacks_t * cbs;
@@ -2420,11 +2447,15 @@ evhtp_callback_free(evhtp_callback_t * callback) {
case evhtp_callback_type_regex:
if (callback->val.regex) {
regfree(callback->val.regex);
+ free(callback->val.regex);
}
break;
#endif
}
+ if( callback->hooks )
+ free( callback->hooks );
+
free(callback);
return;
@@ -2625,7 +2656,7 @@ evhtp_use_threads(evhtp_t * htp, evhtp_thread_init_cb init_cb, int nthreads, voi
htp->thread_init_cb = init_cb;
htp->thread_init_cbarg = arg;
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
evhtp_ssl_use_threads();
#endif
@@ -2636,9 +2667,20 @@ evhtp_use_threads(evhtp_t * htp, evhtp_thread_init_cb init_cb, int nthreads, voi
evthr_pool_start(htp->thr_pool);
return 0;
}
+
+void
+evhtp_unuse_threads(evhtp_t * htp) {
+
+ evthr_pool_stop(htp->thr_pool);
+
+ evhtp_connections_free( htp );
+
+ evthr_pool_free(htp->thr_pool);
+#ifndef EVHTP_DISABLE_SSL
+ evhtp_ssl_unuse_threads();
#endif
+}
-#ifndef EVHTP_DISABLE_EVTHR
int
evhtp_use_callback_locks(evhtp_t * htp) {
if (htp == NULL) {
@@ -2709,7 +2751,7 @@ evhtp_set_post_accept_cb(evhtp_t * htp, evhtp_post_accept_cb cb, void * arg) {
htp->defaults.post_accept_cbarg = arg;
}
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
#ifndef EVHTP_DISABLE_EVTHR
int
evhtp_ssl_use_threads(void) {
@@ -2733,6 +2775,20 @@ evhtp_ssl_use_threads(void) {
return 0;
}
+
+void
+evhtp_ssl_unuse_threads(void) {
+
+ if(ssl_locks_initialized != 1)
+ return;
+
+ ssl_locks_initialized = 0;
+
+ if( ssl_locks )
+ free( ssl_locks );
+
+ return;
+}
#endif
int
@@ -2841,6 +2897,18 @@ evhtp_ssl_init(evhtp_t * htp, evhtp_ssl_cfg_t * cfg) {
return 0;
} /* evhtp_use_ssl */
+void
+evhtp_ssl_deinit( evhtp_t *htp ) {
+
+ SSL_CTX_free( htp->ssl_ctx );
+
+ ERR_remove_state(0);
+ ERR_free_strings();
+ EVP_cleanup();
+ CRYPTO_cleanup_all_ex_data();
+
+}
+
#endif
evbev_t *
@@ -2902,6 +2970,8 @@ evhtp_connection_free(evhtp_connection_t * connection) {
return;
}
+ LIST_REMOVE( connection, next );
+
_evhtp_request_free(connection->request);
_evhtp_connection_fini_hook(connection);
@@ -2917,7 +2987,7 @@ evhtp_connection_free(evhtp_connection_t * connection) {
#ifdef LIBEVENT_HAS_SHUTDOWN
bufferevent_shutdown(connection->bev, _evhtp_shutdown_eventcb);
#else
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
if (connection->ssl != NULL) {
SSL_set_shutdown(connection->ssl, SSL_SENT_SHUTDOWN | SSL_RECEIVED_SHUTDOWN);
SSL_shutdown(connection->ssl);
@@ -2943,6 +3013,26 @@ evhtp_connection_free(evhtp_connection_t * connection) {
} /* evhtp_connection_free */
void
+evhtp_connections_free( evhtp_t *htp )
+{
+ evhtp_connection_t *c, *c_tmp;
+
+ if( !htp->connections )
+ return;
+
+ for( c = LIST_FIRST( htp->connections ); c != NULL; c = c_tmp )
+ {
+ c_tmp = LIST_NEXT( c, next );
+ LIST_REMOVE(c, next );
+ evhtp_connection_free( c );
+ }
+
+ free( htp->connections );
+
+ htp->connections = NULL;
+}
+
+void
evhtp_set_timeouts(evhtp_t * htp, struct timeval * r_timeo, struct timeval * w_timeo) {
if (r_timeo != NULL) {
htp->recv_timeo = malloc(sizeof(struct timeval));
@@ -2972,9 +3062,27 @@ evhtp_new(evbase_t * evbase, void * arg) {
htp->arg = arg;
htp->evbase = evbase;
htp->server_name = "evhtp, sucka";
+ if( !(htp->connections = calloc(sizeof(evhtp_connections_t), 1))) {
+ free(htp);
+ return NULL;
+ }
+
+ LIST_INIT(htp->connections);
evhtp_set_gencb(htp, _evhtp_default_request_cb, (void *)htp);
return htp;
}
+void
+evhtp_free( evhtp_t *htp )
+{
+ evhtp_connections_free( htp );
+
+ evhtp_callbacks_free( htp->callbacks );
+
+ status_code_deinit();
+
+ free( htp );
+}
+
View
19 evhtp.h
@@ -68,6 +68,7 @@ typedef struct evhtp_authority_s evhtp_authority_t;
typedef struct evhtp_request_s evhtp_request_t;
typedef struct evhtp_hooks_s evhtp_hooks_t;
typedef struct evhtp_connection_s evhtp_connection_t;
+typedef struct evhtp_connections_s evhtp_connections_t;
typedef struct evhtp_ssl_cfg_s evhtp_ssl_cfg_t;
typedef uint16_t evhtp_res;
typedef uint8_t evhtp_error_flags;
@@ -244,6 +245,9 @@ struct evhtp_s {
#ifndef EVHTP_DISABLE_EVTHR
pthread_mutex_t * lock; /**< parent lock for add/del cbs in threads */
#endif
+
+ evhtp_connections_t * connections; /**< list of connections, to be able to free them at shutdown */
+
evhtp_callbacks_t * callbacks;
evhtp_defaults_t defaults;
@@ -404,8 +408,11 @@ struct evhtp_connection_s {
int error;
int owner; /*< set to 1 if this structure owns the bufferevent */
evhtp_request_t * request;
+ LIST_ENTRY(evhtp_connection_s) next;
};
+LIST_HEAD(evhtp_connections_s, evhtp_connection_s);
+
struct evhtp_hooks_s {
evhtp_hook_headers_start_cb on_headers_start;
evhtp_hook_header_cb on_header;
@@ -464,11 +471,13 @@ struct evhtp_ssl_cfg_s {
* @return a new evhtp_t structure or NULL on error
*/
evhtp_t * evhtp_new(evbase_t * evbase, void * arg);
+void evhtp_free( evhtp_t *htp );
void evhtp_set_timeouts(evhtp_t * htp, struct timeval * r, struct timeval * w);
int evhtp_ssl_use_threads(void);
+void evhtp_ssl_unuse_threads(void);
int evhtp_ssl_init(evhtp_t * htp, evhtp_ssl_cfg_t * ssl_cfg);
-
+void evhtp_ssl_deinit( evhtp_t *htp );
/**
* @brief creates a lock around callbacks and hooks, allowing for threaded
@@ -563,8 +572,10 @@ int evhtp_set_hook(evhtp_hooks_t ** hooks, evhtp_hook_type type, void * cb, voi
int evhtp_bind_socket(evhtp_t * htp, const char * addr, uint16_t port, int backlog);
int evhtp_bind_sockaddr(evhtp_t * htp, struct sockaddr *, size_t sin_len, int backlog);
+void evhtp_unbind_socket(evhtp_t *htp);
int evhtp_use_threads(evhtp_t * htp, evhtp_thread_init_cb init_cb, int nthreads, void * arg);
+void evhtp_unuse_threads(evhtp_t *htp);
void evhtp_send_reply(evhtp_request_t * request, evhtp_res code);
@@ -839,6 +850,12 @@ evbev_t * evhtp_connection_take_ownership(evhtp_connection_t * connection);
*/
void evhtp_connection_free(evhtp_connection_t * connection);
+/**
+ * @brief free's all connections of a connections list
+ *
+ * @param connections
+ */
+void evhtp_connections_free(evhtp_t *htp);
#ifdef __cplusplus
}
View
14 evthr/evthr.c
@@ -182,7 +182,6 @@ _evthr_loop(void * args) {
fprintf(stderr, "FATAL ERROR!\n");
}
- evthr_free(thread);
pthread_exit(NULL);
}
@@ -199,6 +198,8 @@ evthr_defer(evthr_t * thread, evthr_cb cb, void * arg) {
evthr_inc_backlog(thread);
+ memset( &cmd, 0, sizeof(evthr_cmd_t) );
+
cmd.magic = _EVTHR_MAGIC;
cmd.cb = cb;
cmd.args = arg;
@@ -220,6 +221,8 @@ evthr_res
evthr_stop(evthr_t * thread) {
evthr_cmd_t cmd;
+ memset( &cmd, 0, sizeof(evthr_cmd_t) );
+
cmd.magic = _EVTHR_MAGIC;
cmd.cb = NULL;
cmd.args = NULL;
@@ -234,6 +237,8 @@ evthr_stop(evthr_t * thread) {
pthread_mutex_unlock(thread->rlock);
+ pthread_join( *thread->thr, NULL );
+
return EVTHR_RES_OK;
}
@@ -297,7 +302,6 @@ evthr_new(evthr_init_cb init_cb, void * args) {
int
evthr_start(evthr_t * thread) {
- int res;
if (thread == NULL || thread->thr == NULL) {
return -1;
@@ -307,9 +311,7 @@ evthr_start(evthr_t * thread) {
return -1;
}
- res = pthread_detach(*thread->thr);
-
- return res;
+ return 0;
}
void
@@ -388,8 +390,6 @@ evthr_pool_stop(evthr_pool_t * pool) {
evthr_stop(thr);
}
- memset(&pool->threads, 0, sizeof(pool->threads));
-
return EVTHR_RES_OK;
}
View
58 test.c
@@ -12,7 +12,7 @@
int use_threads = 0;
int num_threads = 0;
#endif
-char * bind_addr = "0.0.0.0";
+char * bind_addr = NULL;
uint16_t bind_port = 8081;
char * ssl_pem = NULL;
char * ssl_ca = NULL;
@@ -25,6 +25,9 @@ struct pauser {
struct timeval * tv;
};
+evbase_t * evbase = NULL;
+evhtp_t * htp = NULL;
+
/* pause testing */
static void
resume_request_timer(int sock, short which, void * arg) {
@@ -355,7 +358,7 @@ set_my_connection_handlers(evhtp_connection_t * conn, void * arg) {
return EVHTP_RES_OK;
}
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
static int
dummy_ssl_verify_callback(int ok, X509_STORE_CTX * x509_store) {
return 1;
@@ -377,7 +380,7 @@ const char * help =
" -t : Run requests in a thread (default: off)\n"
" -n <int> : Number of threads (default: 0 if -t is off, 4 if -t is on)\n"
#endif
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
" -s <pem> : Enable SSL and PEM (default: NULL)\n"
" -c <ca> : CA cert file (default: NULL)\n"
" -C <path>: CA Path (default: NULL)\n"
@@ -415,11 +418,13 @@ parse_args(int argc, char ** argv) {
num_threads = atoi(optarg);
break;
#endif
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
case 's':
+ printf("%s\n", optarg);
ssl_pem = strdup(optarg);
break;
case 'c':
+ printf("%s\n", optarg);
ssl_ca = strdup(optarg);
break;
case 'C':
@@ -445,14 +450,49 @@ parse_args(int argc, char ** argv) {
} /* parse_args */
void
+free_args() {
+
+ if( bind_addr )
+ free( bind_addr );
+
+ if( ssl_pem )
+ free( ssl_pem );
+
+ if( ssl_ca )
+ free( ssl_ca );
+
+ if( ssl_capath )
+ free( ssl_capath );
+
+}
+
+
+void
sigint(int s) {
+ event_base_loopbreak( evbase );
+#ifndef EVHTP_DISABLE_SSL
+ evhtp_ssl_deinit( htp );
+#endif
+
+#ifndef EVHTP_DISABLE_EVTHR
+ if( use_threads )
+ {
+ evhtp_unuse_threads( htp );
+ }
+#endif
+
+ evhtp_unbind_socket( htp );
+ evhtp_free( htp );
+ event_base_free( evbase );
+
+ free_args();
+
exit(0);
}
int
main(int argc, char ** argv) {
- evbase_t * evbase = NULL;
- evhtp_t * htp = NULL;
+
evhtp_callback_t * cb_1 = NULL;
evhtp_callback_t * cb_2 = NULL;
evhtp_callback_t * cb_3 = NULL;
@@ -466,6 +506,9 @@ main(int argc, char ** argv) {
exit(1);
}
+ if( !bind_addr )
+ bind_addr = strdup("0.0.0.0");
+
srand((unsigned)time(NULL));
evbase = event_base_new();
@@ -509,7 +552,7 @@ main(int argc, char ** argv) {
/* set a callback to set per-connection hooks (via a post_accept cb) */
evhtp_set_post_accept_cb(htp, set_my_connection_handlers, NULL);
-#ifndef DISABLE_SSL
+#ifndef EVHTP_DISABLE_SSL
if (ssl_pem != NULL) {
evhtp_ssl_cfg_t scfg = {
.pemfile = ssl_pem,
@@ -549,6 +592,7 @@ main(int argc, char ** argv) {
#ifndef EVHTP_DISABLE_EVTHR
if (use_threads) {
+ printf("Use threads\n");
evhtp_use_threads(htp, NULL, num_threads, NULL);
}
#endif
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