From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 13 Oct 2025 09:25:50 +0000 (+0200)
Subject: sd-dhcp-server: add api to get address from hostname, based on lease data
X-Git-Tag: v259-rc1~43^2~7
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4408db690886308d16059d3c8423546f4c29aa75;p=thirdparty%2Fsystemd.git

sd-dhcp-server: add api to get address from hostname, based on lease data
---

diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index 75031606436..c86e4e0e0c1 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -1711,3 +1711,38 @@ int sd_dhcp_server_set_lease_file(sd_dhcp_server *server, int dir_fd, const char
 
         return 0;
 }
+
+static int find_lease_address(Hashmap *h, const char *name, struct in_addr *ret) {
+        int r;
+
+        assert(name);
+
+        sd_dhcp_server_lease *lease;
+        HASHMAP_FOREACH(lease, h) {
+                if (!lease->hostname)
+                        continue;
+
+                r = dns_name_equal(lease->hostname, name);
+                if (r <= 0)
+                        continue;
+
+                if (ret)
+                        ret->s_addr = lease->address;
+                return 1;
+        }
+
+        return -ENOENT;
+}
+
+int sd_dhcp_server_get_lease_address_by_name(sd_dhcp_server *server, const char *name, struct in_addr *ret) {
+        int r;
+
+        assert_return(server, -EINVAL);
+        assert_return(dns_name_is_valid(name), -EINVAL);
+
+        r = find_lease_address(server->static_leases_by_address, name, ret);
+        if (r != -ENOENT)
+                return r;
+
+        return find_lease_address(server->bound_leases_by_address, name, ret);
+}
diff --git a/src/systemd/sd-dhcp-server.h b/src/systemd/sd-dhcp-server.h
index 2069b9d2875..787d2f41696 100644
--- a/src/systemd/sd-dhcp-server.h
+++ b/src/systemd/sd-dhcp-server.h
@@ -98,6 +98,8 @@ int sd_dhcp_server_is_in_relay_mode(sd_dhcp_server *server);
 int sd_dhcp_server_set_relay_target(sd_dhcp_server *server, const struct in_addr* address);
 int sd_dhcp_server_set_relay_agent_information(sd_dhcp_server *server, const char* circuit_id, const char* remote_id);
 
+int sd_dhcp_server_get_lease_address_by_name(sd_dhcp_server *server, const char *name, struct in_addr *ret);
+
 _SD_DEFINE_POINTER_CLEANUP_FUNC(sd_dhcp_server, sd_dhcp_server_unref);
 
 _SD_END_DECLARATIONS;