- Fix const as reported by newest compiler warnings.

daemon/remote.c

@@ -307,7 +307,7 @@ add_open(const char* ip, int nr, struct listen_port** list, int noproto_is_err,
 #endif
 		}
 	} else {
-		char* s = strchr(ip, '@');
+		const char* s = strchr(ip, '@');
 		char newif[128];
 		if(s) {
 			/* override port with ifspec@port */

doc/Changelog

@@ -10,6 +10,9 @@
 	  Thanks to Xin Wang, Jiapeng Li, and Jiajia Liu, Northwestern
 	  Polytechnical University, for the report.
 
+3 June 2026: Yorgos
+	- Fix const as reported by newest compiler warnings.
+
 29 May 2026: Wouter
 	- Fix header_seen detection for trust anchor files, so that it
 	  detects the id line.

services/listen_dnsport.c

@@ -1126,7 +1126,7 @@ make_sock_port(int stype, const char* ifname, int port,
 	int use_systemd, int dscp, struct unbound_socket* ub_sock,
 	const char* additional)
 {
-	char* s = strchr(ifname, '@');
+	const char* s = strchr(ifname, '@');
 	if(s) {
 		/* override port with ifspec@port */
 		int port;

sldns/str2wire.c

@@ -1201,7 +1201,7 @@ sldns_str2wire_svcbparam_ipv4hint(const char* val, uint8_t* rd, size_t* rd_len)
 {
 	size_t count;
 	char ip_str[INET_ADDRSTRLEN+1];
-	char *next_ip_str;
+	const char *next_ip_str;
 	size_t i;
 
 	for (i = 0, count = 1; val[i]; i++) {
@@ -1256,7 +1256,7 @@ sldns_str2wire_svcbparam_ipv6hint(const char* val, uint8_t* rd, size_t* rd_len)
 {
 	size_t count;
 	char ip_str[INET6_ADDRSTRLEN+1];
-	char *next_ip_str;
+	const char *next_ip_str;
 	size_t i;
 
 	for (i = 0, count = 1; val[i]; i++) {
@@ -1317,7 +1317,7 @@ static int
 sldns_str2wire_svcbparam_mandatory(const char* val, uint8_t* rd, size_t* rd_len)
 {
 	size_t i, count, val_len;
-	char* next_key;
+	const char* next_key;
 
 	val_len = strlen(val);
 

util/config_file.c

@@ -1944,7 +1944,7 @@ extract_port_from_str(const char* str, int max_port) {
 int
 cfg_mark_ports(const char* str, int allow, int* avail, int num)
 {
-	char* mid = strchr(str, '-');
+	const char* mid = strchr(str, '-');
 #ifdef DISABLE_EXPLICIT_PORT_RANDOMISATION
 	log_warn("Explicit port randomisation disabled, ignoring "
 		"outgoing-port-permit and outgoing-port-avoid configuration "
@@ -2647,10 +2647,10 @@ fname_after_chroot(const char* fname, struct config_file* cfg, int use_chdir)
 }
 
 /** return next space character in string */
-static char* next_space_pos(const char* str)
+static const char* next_space_pos(const char* str)
 {
-	char* sp = strchr(str, ' ');
-	char* tab = strchr(str, '\t');
+	const char* sp = strchr(str, ' ');
+	const char* tab = strchr(str, '\t');
 	if(!tab && !sp)
 		return NULL;
 	if(!sp) return tab;
@@ -2659,10 +2659,10 @@ static char* next_space_pos(const char* str)
 }
 
 /** return last space character in string */
-static char* last_space_pos(const char* str)
+static const char* last_space_pos(const char* str)
 {
-	char* sp = strrchr(str, ' ');
-	char* tab = strrchr(str, '\t');
+	const char* sp = strrchr(str, ' ');
+	const char* tab = strrchr(str, '\t');
 	if(!tab && !sp)
 		return NULL;
 	if(!sp) return tab;
@@ -2720,8 +2720,8 @@ cfg_parse_local_zone(struct config_file* cfg, const char* val)
 
 char* cfg_ptr_reverse(char* str)
 {
-	char* ip, *ip_end;
-	char* name;
+	const char* ip, *ip_end;
+	const char* name;
 	char* result;
 	char buf[1024];
 	struct sockaddr_storage addr;
@@ -2872,7 +2872,7 @@ if_listens_on(const char* ifname, int default_port, int port,
 	struct config_strlist* additional_ports)
 {
 	struct config_strlist* s;
-	char* p = strchr(ifname, '@');
+	const char* p = strchr(ifname, '@');
 	int if_port;
 	if(p) if_port = atoi(p+1);
 	else  if_port = default_port;

util/net_help.c

@@ -242,7 +242,7 @@ int
 extstrtoaddr(const char* str, struct sockaddr_storage* addr,
 	socklen_t* addrlen, int port)
 {
-	char* s;
+	const char* s;
 	if((s=strchr(str, '@'))) {
 		char buf[MAX_ADDR_STRLEN];
 		if(s-str >= MAX_ADDR_STRLEN) {
@@ -268,7 +268,7 @@ ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
 	p = (uint16_t) port;
 	if(str_is_ip6(ip)) {
 		char buf[MAX_ADDR_STRLEN];
-		char* s;
+		const char* s;
 		struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
 		*addrlen = (socklen_t)sizeof(struct sockaddr_in6);
 		memset(sa, 0, *addrlen);
@@ -304,8 +304,9 @@ ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
 int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
         socklen_t* addrlen, int* net)
 {
+	const char* s;
 	char buf[64];
-	char* s;
+	char* b = NULL;
 	*net = (str_is_ip6(str)?128:32);
 	if((s=strchr(str, '/'))) {
 		if(atoi(s+1) > *net) {
@@ -323,15 +324,15 @@ int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
 			return 0;
 		}
 		strlcpy(buf, str, sizeof(buf));
-		s = strchr(buf, '/');
-		if(s) *s = 0;
-		s = buf;
+		b = strchr(buf, '/');
+		if(b) *b = 0;
+		b = buf;
 	}
-	if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
+	if(!ipstrtoaddr(b?b:str, port, addr, addrlen)) {
 		log_err("cannot parse ip address: '%s'", str);
 		return 0;
 	}
-	if(s) {
+	if(b) {
 		addr_mask(addr, *addrlen, *net);
 	}
 	return 1;