diff --git a/src/common/log.c b/src/common/log.c
index a5c8b1c8554cd81c65831618649f2fccbea19fd0..7eb73ccff6e96aa8fc6a38a148762d90d456438a 100644
--- a/src/common/log.c
+++ b/src/common/log.c
@@ -403,7 +403,7 @@ int log_msg_zone(int priority, const knot_dname_t *zone, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
- char *zone_str = knot_dname_to_str(zone);
+ char *zone_str = knot_dname_to_str_alloc(zone);
int result = log_msg_text(priority,
zone_str ? zone_str : LOG_NULL_ZONE_STRING,
fmt, args);
diff --git a/src/knot/ctl/remote.c b/src/knot/ctl/remote.c
index fda72b0e3e677a932ed9f3293ed7dd39a90a3fa0..ea54d54764fb8f68c57ebe1ae3887ebbb2a0bb0a 100644
--- a/src/knot/ctl/remote.c
+++ b/src/knot/ctl/remote.c
@@ -561,7 +561,7 @@ static void log_command(const char *cmd, const remote_cmdargs_t* args)
uint16_t rr_count = rr->rrs.rr_count;
for (uint16_t j = 0; j < rr_count; j++) {
const knot_dname_t *dn = knot_ns_name(&rr->rrs, j);
- char *name = knot_dname_to_str(dn);
+ char *name = knot_dname_to_str_alloc(dn);
int ret = snprintf(params, rest, " %s", name);
free(name);
diff --git a/src/knot/dnssec/nsec3-chain.c b/src/knot/dnssec/nsec3-chain.c
index c486a1508c32a89901c7e175baaed21241c6ca77..685ee2998a7150e3e9446674b46793a6414ce264 100644
--- a/src/knot/dnssec/nsec3-chain.c
+++ b/src/knot/dnssec/nsec3-chain.c
@@ -287,7 +287,7 @@ static zone_node_t *create_nsec3_node(knot_dname_t *owner,
if (!new_node) {
return NULL;
}
-
+
node_set_parent(new_node, apex_node);
knot_rrset_t nsec3_rrset;
@@ -385,7 +385,7 @@ static int connect_nsec3_nodes(zone_node_t *a, zone_node_t *b,
assert(raw_length == knot_nsec3_hash_length(algorithm));
knot_dname_to_lower(b->owner);
- uint8_t *b32_hash = (uint8_t *)knot_dname_to_str(b->owner);
+ uint8_t *b32_hash = (uint8_t *)knot_dname_to_str_alloc(b->owner);
size_t b32_length = knot_nsec3_hash_b32_length(algorithm);
if (!b32_hash) {
return KNOT_ENOMEM;
diff --git a/src/knot/nameserver/chaos.c b/src/knot/nameserver/chaos.c
index 41822136355eede084f8557e4ed8e47cd2763114..086ca8e7aff258df824dfdfd1f3091f0c1ce0d5e 100644
--- a/src/knot/nameserver/chaos.c
+++ b/src/knot/nameserver/chaos.c
@@ -26,7 +26,7 @@
*/
static const char *get_txt_response_string(const knot_dname_t *qname)
{
- char *qname_str = knot_dname_to_str(qname);
+ char *qname_str = knot_dname_to_str_alloc(qname);
const char *response = NULL;
/* id.server and hostname.bind should have similar meaning */
diff --git a/src/knot/updates/ddns.c b/src/knot/updates/ddns.c
index 9a4158ade629db75a427d4be0928f39e36b77930..494d00bbf6c61be155d381c6928b1e7f7f2f9fe7 100644
--- a/src/knot/updates/ddns.c
+++ b/src/knot/updates/ddns.c
@@ -436,7 +436,7 @@ static bool singleton_replaced(changeset_t *changeset,
if (!should_replace(rr)) {
return false;
}
-
+
zone_node_t *n = zone_contents_find_node_for_rr(changeset->add, rr);
if (n == NULL) {
return false;
@@ -446,12 +446,12 @@ static bool singleton_replaced(changeset_t *changeset,
if (rrs == NULL) {
return false;
}
-
+
// Replace singleton RR.
knot_rdataset_clear(rrs, NULL);
node_remove_rdataset(n, rr->type);
node_add_rrset(n, rr, NULL);
-
+
return true;
}
@@ -544,7 +544,7 @@ static int process_add_nsec3param(const zone_node_t *node,
{
if (node == NULL || !node_rrtype_exists(node, KNOT_RRTYPE_SOA)) {
// Ignore non-apex additions
- char *owner = knot_dname_to_str(rr->owner);
+ char *owner = knot_dname_to_str_alloc(rr->owner);
log_warning("DDNS, refusing to add NSEC3PARAM to non-apex "
"node '%s'", owner);
free(owner);
@@ -555,7 +555,7 @@ static int process_add_nsec3param(const zone_node_t *node,
return add_rr_to_chgset(rr, changeset, NULL);
}
- char *owner = knot_dname_to_str(rr->owner);
+ char *owner = knot_dname_to_str_alloc(rr->owner);
log_warning("DDNS, refusing to add second NSEC3PARAM to node '%s'", owner);
free(owner);
@@ -918,7 +918,7 @@ int ddns_process_update(const zone_t *zone, const knot_pkt_t *query,
}
return KNOT_EINVAL;
}
-
+
changeset_t *changeset = update->change;
if (changeset->soa_from == NULL) {
diff --git a/src/knot/zone/semantic-check.c b/src/knot/zone/semantic-check.c
index be0821ae1f3537ae6ba25f257305837d6cc59396..cc06004a502893fba42d7ee6615ac62c80f6802b 100644
--- a/src/knot/zone/semantic-check.c
+++ b/src/knot/zone/semantic-check.c
@@ -181,7 +181,7 @@ static void log_error_from_node(err_handler_t *handler,
handler->error_count++;
- char *name = knot_dname_to_str(node->owner);
+ char *name = knot_dname_to_str_alloc(node->owner);
const char *errmsg = error_messages[-error];
log_zone_warning(zone_name, "semantic check, node '%s' (%s%s%s)",
diff --git a/src/knot/zone/zonefile.c b/src/knot/zone/zonefile.c
index 70ee8e988f08e280c1c17c3a0c723ef887553bd6..9c26863ad5a70c389d9b72c3eb1e2d0d4e8fc880 100644
--- a/src/knot/zone/zonefile.c
+++ b/src/knot/zone/zonefile.c
@@ -63,7 +63,7 @@ static bool handle_err(zcreator_t *zc, const zone_node_t *node,
const knot_rrset_t *rr, int ret, bool master)
{
const knot_dname_t *zname = zc->z->apex->owner;
- char *rrname = rr ? knot_dname_to_str(rr->owner) : NULL;
+ char *rrname = rr ? knot_dname_to_str_alloc(rr->owner) : NULL;
if (ret == KNOT_EOUTOFZONE) {
WARNING(zname, "ignoring out-of-zone data, owner '%s'",
rrname ? rrname : "unknown");
@@ -164,7 +164,7 @@ static void scanner_process(zs_scanner_t *scanner)
knot_rrset_init(&rr, owner, scanner->r_type, scanner->r_class);
int ret = add_rdata_to_rr(&rr, scanner);
if (ret != KNOT_EOK) {
- char *rr_name = knot_dname_to_str(rr.owner);
+ char *rr_name = knot_dname_to_str_alloc(rr.owner);
const knot_dname_t *zname = zc->z->apex->owner;
ERROR(zname, "failed to add RDATA, file '%s', line %"PRIu64", owner '%s'",
scanner->file.name, scanner->line_counter, rr_name);
diff --git a/src/libknot/dname.c b/src/libknot/dname.c
index e5ad1b8494e5eb17b9880f55fcfe18ab9578b196..2df6c5ce32e2673e2cc4dd94efc2e2c2061155e2 100644
--- a/src/libknot/dname.c
+++ b/src/libknot/dname.c
@@ -211,17 +211,24 @@ int knot_dname_unpack(uint8_t* dst, const knot_dname_t *src,
/*----------------------------------------------------------------------------*/
-char *knot_dname_to_str(const knot_dname_t *name)
+char *knot_dname_to_str(char *dst, const knot_dname_t *name, size_t maxlen)
{
- if (name == NULL)
+ if (name == NULL) {
return NULL;
+ }
- /*! \todo Supply packet. */
- /*! \todo Write to static buffer? */
- // Allocate space for dname string + 1 char termination.
int dname_size = knot_dname_size(name);
- size_t alloc_size = dname_size + 1;
- char *res = malloc(alloc_size);
+ if (dname_size <= 0) {
+ return NULL;
+ }
+
+ // Check the size for len(dname) + 1 char termination.
+ size_t alloc_size = (dst == NULL) ? dname_size + 1 : maxlen;
+ if (alloc_size < dname_size + 1) {
+ return NULL;
+ }
+
+ char *res = (dst == NULL) ? malloc(alloc_size) : dst;
if (res == NULL) {
return NULL;
}
@@ -253,33 +260,47 @@ char *knot_dname_to_str(const knot_dname_t *name)
* encoded in \ddd notation.
*/
- // Increase output size for \x format.
- alloc_size += 1;
- char *extended = realloc(res, alloc_size);
- if (extended == NULL) {
- free(res);
- return NULL;
+ if (dst != NULL) {
+ if (maxlen <= str_len + 2) {
+ return NULL;
+ }
+ } else {
+ // Extend output buffer for \x format.
+ alloc_size += 1;
+ char *extended = realloc(res, alloc_size);
+ if (extended == NULL) {
+ free(res);
+ return NULL;
+ }
+ res = extended;
}
- res = extended;
// Write encoded character.
res[str_len++] = '\\';
res[str_len++] = c;
} else {
- // Increase output size for \DDD format.
- alloc_size += 3;
- char *extended = realloc(res, alloc_size);
- if (extended == NULL) {
- free(res);
- return NULL;
+ if (dst != NULL) {
+ if (maxlen <= str_len + 4) {
+ return NULL;
+ }
+ } else {
+ // Extend output buffer for \DDD format.
+ alloc_size += 3;
+ char *extended = realloc(res, alloc_size);
+ if (extended == NULL) {
+ free(res);
+ return NULL;
+ }
+ res = extended;
}
- res = extended;
// Write encoded character.
int ret = snprintf(res + str_len, alloc_size - str_len,
"\\%03u", c);
if (ret <= 0 || ret >= alloc_size - str_len) {
- free(res);
+ if (dst == NULL) {
+ free(res);
+ }
return NULL;
}
diff --git a/src/libknot/dname.h b/src/libknot/dname.h
index 58bfc174e03d347572c1a54cee3d480ed833a746..bafe66847db749d9e19c43f547ed5ccf45c63c56 100644
--- a/src/libknot/dname.h
+++ b/src/libknot/dname.h
@@ -118,18 +118,26 @@ int knot_dname_unpack(uint8_t *dst, const knot_dname_t *src,
size_t maxlen, const uint8_t *pkt);
/*!
- * \brief Converts the given domain name to string representation.
+ * \brief Converts the given domain name to its string representation.
*
- * \note Allocates new memory, remember to free it.
+ * \note Output buffer is allocated automatically if dst is NULL.
*
- * \todo The function doesn't process escaped characters like \DDD or \X.
+ * \param dst Output buffer.
+ * \param name Domain name to be converted.
+ * \param maxlen Output buffer length.
*
- * \param name Domain name to be converted.
- *
- * \return 0-terminated string representing the given domain name in
- * presentation format.
+ * \return 0-terminated string if successful, NULL if error.
+ */
+char *knot_dname_to_str(char *dst, const knot_dname_t *name, size_t maxlen);
+
+/*!
+ * \brief This function is a shortcut for \ref knot_dname_to_str with
+ * no output buffer parameters.
*/
-char *knot_dname_to_str(const knot_dname_t *name);
+static inline char *knot_dname_to_str_alloc(const knot_dname_t *name)
+{
+ return knot_dname_to_str(NULL, name, 0);
+}
/*!
* \brief Creates a dname structure from domain name given in presentation
diff --git a/src/libknot/rrset-dump.c b/src/libknot/rrset-dump.c
index 75f3590e2031d8aa0e6b6f12ca577fa29b4089b2..647ea6b95752cad3054b70abcdb23ce300e7ed0d 100644
--- a/src/libknot/rrset-dump.c
+++ b/src/libknot/rrset-dump.c
@@ -804,16 +804,23 @@ static void wire_dname_to_str(rrset_dump_params_t *p)
}
// Write dname string.
- char *dname_str = knot_dname_to_str(p->in);
- if (p->style->ascii_to_idn != NULL) {
+ if (p->style->ascii_to_idn == NULL) {
+ char *dname_str = knot_dname_to_str(p->out, p->in, p->out_max);
+ if (dname_str == NULL) {
+ return;
+ }
+ out_len = strlen(dname_str);
+ } else {
+ char *dname_str = knot_dname_to_str_alloc(p->in);
p->style->ascii_to_idn(&dname_str);
+
+ int ret = snprintf(p->out, p->out_max, "%s", dname_str);
+ free(dname_str);
+ if (ret < 0 || (size_t)ret >= p->out_max) {
+ return;
+ }
+ out_len = ret;
}
- int ret = snprintf(p->out, p->out_max, "%s", dname_str);
- free(dname_str);
- if (ret < 0 || (size_t)ret >= p->out_max) {
- return;
- }
- out_len = ret;
// Fill in output.
p->in += in_len;
@@ -1831,7 +1838,7 @@ int knot_rrset_txt_dump_header(const knot_rrset_t *rrset,
int ret;
// Dump rrset owner.
- char *name = knot_dname_to_str(rrset->owner);
+ char *name = knot_dname_to_str_alloc(rrset->owner);
if (style->ascii_to_idn != NULL) {
style->ascii_to_idn(&name);
}
diff --git a/src/libknot/rrtype/tsig.c b/src/libknot/rrtype/tsig.c
index 814883d48d452289453ec93d0846e4cb7951d4da..7722d3a1d47de58d42800ec65542936cee350190 100644
--- a/src/libknot/rrtype/tsig.c
+++ b/src/libknot/rrtype/tsig.c
@@ -241,7 +241,7 @@ knot_tsig_algorithm_t tsig_rdata_alg(const knot_rrset_t *tsig)
}
/* Convert alg name to string. */
- char *name = knot_dname_to_str(alg_name);
+ char *name = knot_dname_to_str_alloc(alg_name);
if (!name) {
dbg_tsig("TSIG: rdata: cannot convert alg name.\n");
return KNOT_TSIG_ALG_NULL;
@@ -336,7 +336,7 @@ int tsig_alg_from_name(const knot_dname_t *alg_name)
return 0;
}
- char *name = knot_dname_to_str(alg_name);
+ char *name = knot_dname_to_str_alloc(alg_name);
if (!name) {
return 0;
}
diff --git a/src/libknot/tsig-op.c b/src/libknot/tsig-op.c
index 43c6b6c009139dac48714c15aca865ddedbfa589..2d91e2db75eccfccbaf61c6754bb04f1766ac322 100644
--- a/src/libknot/tsig-op.c
+++ b/src/libknot/tsig-op.c
@@ -69,7 +69,7 @@ static int knot_tsig_check_key(const knot_rrset_t *tsig_rr,
return KNOT_EMALF;
}
- char *name = knot_dname_to_str(tsig_name);
+ char *name = knot_dname_to_str_alloc(tsig_name);
if (!name) {
return KNOT_EMALF;
}
diff --git a/src/utils/common/exec.c b/src/utils/common/exec.c
index b4ff5fa5fe6a92469bddd9772d4dd6a0f70032ca..d516518aff7e90fb24b17504ebdb98e44e2a4908 100644
--- a/src/utils/common/exec.c
+++ b/src/utils/common/exec.c
@@ -376,7 +376,7 @@ static void print_section_host(const knot_rrset_t *rrsets,
char type[32] = "NULL";
char *owner;
- owner = knot_dname_to_str(rrset->owner);
+ owner = knot_dname_to_str_alloc(rrset->owner);
if (style->style.ascii_to_idn != NULL) {
style->style.ascii_to_idn(&owner);
}
@@ -432,7 +432,7 @@ static void print_error_host(const uint8_t code,
knot_lookup_table_t *rcode;
- owner = knot_dname_to_str(knot_pkt_qname(packet));
+ owner = knot_dname_to_str_alloc(knot_pkt_qname(packet));
if (style->style.ascii_to_idn != NULL) {
style->style.ascii_to_idn(&owner);
}
@@ -486,7 +486,7 @@ void print_header_xfr(const knot_pkt_t *packet, const style_t *style)
}
if (style->show_header) {
- char *owner = knot_dname_to_str(knot_pkt_qname(packet));
+ char *owner = knot_dname_to_str_alloc(knot_pkt_qname(packet));
if (style->style.ascii_to_idn != NULL) {
style->style.ascii_to_idn(&owner);
}
diff --git a/tests/ztree.c b/tests/ztree.c
index 4d24d9cd5c2848d2f310240490923f26d9a807bc..09523665e323ad9b987da764978ff7bd21822f50 100644
--- a/tests/ztree.c
+++ b/tests/ztree.c
@@ -55,8 +55,8 @@ static int ztree_iter_data(zone_node_t **node, void *data)
int result = KNOT_EOK;
if (owner != ORDER[*i]) {
result = KNOT_ERROR;
- char *exp_s = knot_dname_to_str(ORDER[*i]);
- char *owner_s = knot_dname_to_str(owner);
+ char *exp_s = knot_dname_to_str_alloc(ORDER[*i]);
+ char *owner_s = knot_dname_to_str_alloc(owner);
diag("ztree: at index: %u expected '%s' got '%s'\n", *i, exp_s, owner_s);
free(exp_s);
free(owner_s);