[Freeipa-devel] [PATCH 0046] Separate RR data parsing from LDAP connections
Adam Tkac
atkac at redhat.com
Wed Aug 15 13:31:48 UTC 2012
On Wed, Aug 01, 2012 at 04:19:11PM +0200, Petr Spacek wrote:
> Hello,
>
> this patch finishes LDAP connection vs. LDAP result separation.
>
> It is first step necessary for:
> https://fedorahosted.org/bind-dyndb-ldap/ticket/68
> Avoid manual connection management outside ldap_query()
>
> It should prevent deadlocks in future.
>
> Petr^2 Spacek
Thanks for the patch, please check one comment below.
Regards, Adam
> From 4ba44be9e9bb7ef5abc9e077d6620de496ae7c0d Mon Sep 17 00:00:00 2001
> From: Petr Spacek <pspacek at redhat.com>
> Date: Tue, 31 Jul 2012 14:33:53 +0200
> Subject: [PATCH] Separate RR data parsing from LDAP connections.
>
> Signed-off-by: Petr Spacek <pspacek at redhat.com>
> ---
> src/ldap_helper.c | 76 ++++++++++++++++++++++++++++++-------------------------
> 1 file changed, 42 insertions(+), 34 deletions(-)
>
> diff --git a/src/ldap_helper.c b/src/ldap_helper.c
> index cc7003a6cdcd2d27404fec936623ed8a3e8fa7f8..af0ec092d29bce170d5c2dfa8836a728440116a3 100644
> --- a/src/ldap_helper.c
> +++ b/src/ldap_helper.c
> @@ -196,11 +196,6 @@ struct ldap_connection {
> LDAPControl *serverctrls[2]; /* psearch/NULL or NULL/NULL */
> int msgid;
>
> - /* Parsing. */
> - isc_lex_t *lex;
> - isc_buffer_t rdata_target;
> - unsigned char *rdata_target_mem;
> -
> /* For reconnection logic. */
> isc_time_t next_reconnect;
> unsigned int tries;
> @@ -214,6 +209,11 @@ struct ldap_qresult {
> ld_string_t *query_string;
> LDAPMessage *result;
> ldap_entrylist_t ldap_entries;
> +
> + /* Parsing. */
> + isc_lex_t *lex;
> + isc_buffer_t rdata_target;
> + unsigned char *rdata_target_mem;
> };
>
> /*
> @@ -256,15 +256,15 @@ static void destroy_ldap_connection(ldap_pool_t *pool,
> static isc_result_t findrdatatype_or_create(isc_mem_t *mctx,
> ldapdb_rdatalist_t *rdatalist, dns_rdataclass_t rdclass,
> dns_rdatatype_t rdtype, dns_ttl_t ttl, dns_rdatalist_t **rdlistp);
> -static isc_result_t add_soa_record(isc_mem_t *mctx, ldap_connection_t *ldap_conn,
> +static isc_result_t add_soa_record(isc_mem_t *mctx, ldap_qresult_t *qresult,
> dns_name_t *origin, ldap_entry_t *entry,
> ldapdb_rdatalist_t *rdatalist, const ld_string_t *fake_mname);
> -static isc_result_t parse_rdata(isc_mem_t *mctx, ldap_connection_t *ldap_conn,
> +static isc_result_t parse_rdata(isc_mem_t *mctx, ldap_qresult_t *qresult,
> dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
> dns_name_t *origin, const char *rdata_text,
> dns_rdata_t **rdatap);
> static isc_result_t ldap_parse_rrentry(isc_mem_t *mctx, ldap_entry_t *entry,
> - ldap_connection_t *conn, dns_name_t *origin,
> + ldap_qresult_t *qresult, dns_name_t *origin,
> const ld_string_t *fake_mname, ld_string_t *buf,
> ldapdb_rdatalist_t *rdatalist);
> static inline isc_result_t ldap_get_zone_serial(ldap_instance_t *inst,
> @@ -637,8 +637,6 @@ new_ldap_connection(ldap_pool_t *pool, ldap_connection_t **ldap_connp)
>
> isc_mem_attach(pool->mctx, &ldap_conn->mctx);
>
> - CHECK(isc_lex_create(ldap_conn->mctx, TOKENSIZ, &ldap_conn->lex));
> - CHECKED_MEM_GET(ldap_conn->mctx, ldap_conn->rdata_target_mem, MINTSIZ);
> CHECK(ldap_pscontrol_create(ldap_conn->mctx,
> &ldap_conn->serverctrls[0]));
>
> @@ -667,12 +665,6 @@ destroy_ldap_connection(ldap_pool_t *pool, ldap_connection_t **ldap_connp)
> if (ldap_conn->handle != NULL)
> ldap_unbind_ext_s(ldap_conn->handle, NULL, NULL);
>
> - if (ldap_conn->lex != NULL)
> - isc_lex_destroy(&ldap_conn->lex);
> - if (ldap_conn->rdata_target_mem != NULL) {
> - isc_mem_put(ldap_conn->mctx,
> - ldap_conn->rdata_target_mem, MINTSIZ);
> - }
> if (ldap_conn->serverctrls[0] != NULL) {
> ldap_pscontrol_destroy(ldap_conn->mctx,
> &ldap_conn->serverctrls[0]);
> @@ -1431,7 +1423,7 @@ free_rdatalist(isc_mem_t *mctx, dns_rdatalist_t *rdlist)
>
> static isc_result_t
> ldap_parse_rrentry(isc_mem_t *mctx, ldap_entry_t *entry,
> - ldap_connection_t *conn, dns_name_t *origin,
> + ldap_qresult_t *qresult, dns_name_t *origin,
> const ld_string_t *fake_mname, ld_string_t *buf,
> ldapdb_rdatalist_t *rdatalist)
> {
> @@ -1443,7 +1435,7 @@ ldap_parse_rrentry(isc_mem_t *mctx, ldap_entry_t *entry,
> dns_rdatalist_t *rdlist = NULL;
> ldap_attribute_t *attr;
>
> - result = add_soa_record(mctx, conn, origin, entry,
> + result = add_soa_record(mctx, qresult, origin, entry,
> rdatalist, fake_mname);
> if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
> goto cleanup;
> @@ -1458,7 +1450,7 @@ ldap_parse_rrentry(isc_mem_t *mctx, ldap_entry_t *entry,
> CHECK(findrdatatype_or_create(mctx, rdatalist, rdclass,
> rdtype, ttl, &rdlist));
> while (ldap_attr_nextvalue(attr, buf) != NULL) {
> - CHECK(parse_rdata(mctx, conn, rdclass,
> + CHECK(parse_rdata(mctx, qresult, rdclass,
> rdtype, origin,
> str_buf(buf), &rdata));
> APPEND(rdlist->rdata, rdata, link);
> @@ -1518,7 +1510,7 @@ ldapdb_nodelist_get(isc_mem_t *mctx, ldap_instance_t *ldap_inst, dns_name_t *nam
> result = ldapdbnode_create(mctx, &node_name, &node);
> dns_name_free(&node_name, mctx);
> if (result == ISC_R_SUCCESS) {
> - result = ldap_parse_rrentry(mctx, entry, ldap_conn,
> + result = ldap_parse_rrentry(mctx, entry, ldap_qresult,
> origin, ldap_inst->fake_mname,
> string, &node->rdatalist);
> }
> @@ -1584,7 +1576,7 @@ ldapdb_rdatalist_get(isc_mem_t *mctx, ldap_instance_t *ldap_inst, dns_name_t *na
> for (entry = HEAD(ldap_qresult->ldap_entries);
> entry != NULL;
> entry = NEXT(entry, link)) {
> - if (ldap_parse_rrentry(mctx, entry, ldap_conn,
> + if (ldap_parse_rrentry(mctx, entry, ldap_qresult,
> origin, ldap_inst->fake_mname,
> string, rdatalist) != ISC_R_SUCCESS ) {
> log_error("Failed to parse RR entry (%s)", str_buf(string));
> @@ -1610,7 +1602,7 @@ cleanup:
> }
>
> static isc_result_t
> -add_soa_record(isc_mem_t *mctx, ldap_connection_t *ldap_conn, dns_name_t *origin,
> +add_soa_record(isc_mem_t *mctx, ldap_qresult_t *qresult, dns_name_t *origin,
> ldap_entry_t *entry, ldapdb_rdatalist_t *rdatalist,
> const ld_string_t *fake_mname)
> {
> @@ -1624,7 +1616,7 @@ add_soa_record(isc_mem_t *mctx, ldap_connection_t *ldap_conn, dns_name_t *origin
>
> CHECK(ldap_entry_getfakesoa(entry, fake_mname, string));
> rdclass = ldap_entry_getrdclass(entry);
> - CHECK(parse_rdata(mctx, ldap_conn, rdclass, dns_rdatatype_soa, origin,
> + CHECK(parse_rdata(mctx, qresult, rdclass, dns_rdatatype_soa, origin,
> str_buf(string), &rdata));
>
> CHECK(findrdatatype_or_create(mctx, rdatalist, rdclass, dns_rdatatype_soa,
> @@ -1641,17 +1633,17 @@ cleanup:
> }
>
> static isc_result_t
> -parse_rdata(isc_mem_t *mctx, ldap_connection_t *ldap_conn,
> +parse_rdata(isc_mem_t *mctx, ldap_qresult_t *qresult,
> dns_rdataclass_t rdclass, dns_rdatatype_t rdtype,
> dns_name_t *origin, const char *rdata_text, dns_rdata_t **rdatap)
> {
> isc_result_t result;
> isc_consttextregion_t text;
> isc_buffer_t lex_buffer;
> isc_region_t rdatamem;
> dns_rdata_t *rdata;
>
> - REQUIRE(ldap_conn != NULL);
> + REQUIRE(qresult != NULL);
> REQUIRE(rdata_text != NULL);
> REQUIRE(rdatap != NULL);
>
> @@ -1665,30 +1657,30 @@ parse_rdata(isc_mem_t *mctx, ldap_connection_t *ldap_conn,
> isc_buffer_add(&lex_buffer, text.length);
> isc_buffer_setactive(&lex_buffer, text.length);
>
> - CHECK(isc_lex_openbuffer(ldap_conn->lex, &lex_buffer));
> + CHECK(isc_lex_openbuffer(qresult->lex, &lex_buffer));
>
> - isc_buffer_init(&ldap_conn->rdata_target, ldap_conn->rdata_target_mem,
> + isc_buffer_init(&qresult->rdata_target, qresult->rdata_target_mem,
> MINTSIZ);
> - CHECK(dns_rdata_fromtext(NULL, rdclass, rdtype, ldap_conn->lex, origin,
> - 0, mctx, &ldap_conn->rdata_target, NULL));
> + CHECK(dns_rdata_fromtext(NULL, rdclass, rdtype, qresult->lex, origin,
> + 0, mctx, &qresult->rdata_target, NULL));
>
> CHECKED_MEM_GET_PTR(mctx, rdata);
> dns_rdata_init(rdata);
>
> - rdatamem.length = isc_buffer_usedlength(&ldap_conn->rdata_target);
> + rdatamem.length = isc_buffer_usedlength(&qresult->rdata_target);
> CHECKED_MEM_GET(mctx, rdatamem.base, rdatamem.length);
>
> - memcpy(rdatamem.base, isc_buffer_base(&ldap_conn->rdata_target),
> + memcpy(rdatamem.base, isc_buffer_base(&qresult->rdata_target),
> rdatamem.length);
> dns_rdata_fromregion(rdata, rdclass, rdtype, &rdatamem);
>
> - isc_lex_close(ldap_conn->lex);
> + isc_lex_close(qresult->lex);
>
> *rdatap = rdata;
> return ISC_R_SUCCESS;
>
> cleanup:
> - isc_lex_close(ldap_conn->lex);
> + isc_lex_close(qresult->lex);
> if (rdata != NULL)
> isc_mem_put(mctx, rdata, sizeof(*rdata));
> if (rdatamem.base != NULL)
> @@ -1793,14 +1785,25 @@ ldap_query_create(isc_mem_t *mctx, ldap_qresult_t **ldap_qresultp) {
> ldap_qresult->mctx = mctx;
> ldap_qresult->result = NULL;
> ldap_qresult->query_string = NULL;
> + ldap_qresult->lex = NULL;
I recommend to use ZERO_PTR(ldap_qresult) instead of many "= NULL" assignments.
It's safer and used in other *_create functions.
> INIT_LIST(ldap_qresult->ldap_entries);
> CHECK(str_new(mctx, &ldap_qresult->query_string));
>
> + CHECKED_MEM_GET(ldap_qresult->mctx, ldap_qresult->rdata_target_mem, MINTSIZ);
> + CHECK(isc_lex_create(ldap_qresult->mctx, TOKENSIZ, &ldap_qresult->lex));
> +
> *ldap_qresultp = ldap_qresult;
> return ISC_R_SUCCESS;
>
> cleanup:
> - SAFE_MEM_PUT_PTR(mctx, ldap_qresult);
> + if (ldap_qresult != NULL) {
> + str_destroy(&ldap_qresult->query_string);
> + SAFE_MEM_PUT(ldap_qresult->mctx, ldap_qresult->rdata_target_mem, MINTSIZ);
> + if (ldap_qresult->lex != NULL)
> + isc_lex_destroy(&ldap_qresult->lex);
> + SAFE_MEM_PUT_PTR(mctx, ldap_qresult);
> + }
> +
> return result;
> }
>
> @@ -1833,8 +1836,13 @@ ldap_query_free(isc_boolean_t prepare_reuse, ldap_qresult_t **ldap_qresultp)
> if (prepare_reuse) {
> str_clear(qresult->query_string);
> INIT_LIST(qresult->ldap_entries);
> + isc_lex_close(qresult->lex);
> } else { /* free the whole structure */
> str_destroy(&qresult->query_string);
> + if (qresult->lex != NULL)
> + isc_lex_destroy(&qresult->lex);
> + if (qresult->rdata_target_mem != NULL)
> + isc_mem_put(qresult->mctx, qresult->rdata_target_mem, MINTSIZ);
> SAFE_MEM_PUT_PTR(qresult->mctx, qresult);
> *ldap_qresultp = NULL;
> }
> --
> 1.7.11.2
>
--
Adam Tkac, Red Hat, Inc.
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