sd-network: remove client-side dhcp API

The networkd should abstract the difference between DHCP supplied and
configured data, and hence the DHCP lease concept should not exposed on
the client side.

Should we want to support arbitrary DHCP fields one day, we can add a
new sd_network_get_link_dhcp_field() call or so.

src/network/sd-network.c

@@ -33,7 +33,6 @@
 #include "fileio.h"
 #include "sd-network.h"
 #include "network-internal.h"
-#include "dhcp-lease-internal.h"
 
 _public_ int sd_network_get_link_state(int ifindex, char **state) {
         _cleanup_free_ char *s = NULL, *p = NULL;
@@ -131,33 +130,6 @@ _public_ int sd_network_get_link_llmnr(int ifindex, char **llmnr) {
         return 0;
 }
 
-_public_ int sd_network_get_link_dhcp_lease(int ifindex, sd_dhcp_lease **ret) {
-        _cleanup_free_ char *p = NULL, *s = NULL;
-        sd_dhcp_lease *lease = NULL;
-        int r;
-
-        assert_return(ifindex > 0, -EINVAL);
-        assert_return(ret, -EINVAL);
-
-        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
-                return -ENOMEM;
-
-        r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL);
-
-        if (r < 0)
-                return r;
-        else if (!s)
-                return -EIO;
-
-        r = dhcp_lease_load(s, &lease);
-        if (r < 0)
-                return r;
-
-        *ret = lease;
-
-        return 0;
-}
-
 static int network_get_link_strv(const char *key, int ifindex, char ***ret) {
         _cleanup_free_ char *p = NULL, *s = NULL;
         _cleanup_strv_free_ char **a = NULL;
@@ -227,16 +199,6 @@ _public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category
                 good = true;
         }
 
-        if (!category || streq(category, "leases")) {
-                k = inotify_add_watch(fd, "/run/systemd/netif/leases/", IN_MOVED_TO|IN_DELETE);
-                if (k < 0) {
-                        safe_close(fd);
-                        return -errno;
-                }
-
-                good = true;
-        }
-
         if (!good) {
                 close_nointr(fd);
                 return -EINVAL;

src/systemd/sd-network.h

@@ -26,8 +26,6 @@
 #include <sys/types.h>
 #include <inttypes.h>
 
-#include "sd-dhcp-lease.h"
-
 #include "_sd-common.h"
 
 /*
@@ -73,9 +71,6 @@ int sd_network_get_link_state(int ifindex, char **state);
  */
 int sd_network_get_link_operational_state(int ifindex, char **state);
 
-/* Get DHCPv4 lease from ifindex. */
-int sd_network_get_link_dhcp_lease(int ifindex, sd_dhcp_lease **ret);
-
 /* Indicates whether or not LLMNR should be enabled for the link
  * Possible levels of support: yes, no, resolve
  * Possible return codes: