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dhcp: support FQDN flags in the nettools backend

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Make the nettools backed honor the ipv4.dhcp-hostname-flags property.
This commit is contained in:
Beniamino Galvani 2019-06-25 21:27:02 +02:00
parent 316ff68bfa
commit aa8d5a3e9e
1 changed files with 41 additions and 20 deletions
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61
src/dhcp/nm-dhcp-nettools.c
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@ -71,13 +71,6 @@ G_DEFINE_TYPE (NMDhcpNettools, nm_dhcp_nettools, NM_TYPE_DHCP_CLIENT)
#define DHCP_MAX_FQDN_LENGTH 255
enum {
DHCP_FQDN_FLAG_S = (1 << 0),
DHCP_FQDN_FLAG_O = (1 << 1),
DHCP_FQDN_FLAG_E = (1 << 2),
DHCP_FQDN_FLAG_N = (1 << 3),
};
enum {
NM_IN_ADDR_CLASS_A,
NM_IN_ADDR_CLASS_B,
@ -1220,6 +1213,22 @@ decline (NMDhcpClient *client,
return TRUE;
}
static guint8
fqdn_flags_to_wire (NMDhcpHostnameFlags flags)
{
guint r = 0;
/* RFC 4702 section 2.1 */
if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_SERV_UPDATE)
r |= (1 << 0);
if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED)
r |= (1 << 2);
if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_NO_UPDATE)
r |= (1 << 3);
return r;
}
static gboolean
ip4_start (NMDhcpClient *client,
const char *dhcp_anycast_addr,
@ -1289,26 +1298,38 @@ ip4_start (NMDhcpClient *client,
hostname = nm_dhcp_client_get_hostname (client);
if (hostname) {
if (nm_dhcp_client_get_use_fqdn (client)) {
uint8_t buffer[3 + DHCP_MAX_FQDN_LENGTH];
uint8_t buffer[255];
NMDhcpHostnameFlags flags;
size_t fqdn_len;
buffer[0] = DHCP_FQDN_FLAG_S | /* Request server to perform A RR DNS updates */
DHCP_FQDN_FLAG_E; /* Canonical wire format */
buffer[1] = 0; /* RCODE1 (deprecated) */
buffer[2] = 0; /* RCODE2 (deprecated) */
flags = nm_dhcp_client_get_hostname_flags (client);
buffer[0] = fqdn_flags_to_wire (flags);
buffer[1] = 0; /* RCODE1 (deprecated) */
buffer[2] = 0; /* RCODE2 (deprecated) */
r = nm_sd_dns_name_to_wire_format (hostname,
buffer + 3,
sizeof (buffer) - 3,
FALSE);
if (r < 0) {
nm_utils_error_set_errno (error, r, "failed to convert DHCP FQDN: %s");
return FALSE;
if (flags & NM_DHCP_HOSTNAME_FLAG_FQDN_ENCODED) {
r = nm_sd_dns_name_to_wire_format (hostname,
buffer + 3,
sizeof (buffer) - 3,
FALSE);
if (r <= 0) {
nm_utils_error_set_errno (error, r, "failed to convert DHCP FQDN: %s");
return FALSE;
}
fqdn_len = r;
} else {
fqdn_len = strlen (hostname);
if (fqdn_len > sizeof (buffer) - 3) {
nm_utils_error_set (error, r, "failed to set DHCP FQDN: name too long");
return FALSE;
}
memcpy (buffer + 3, hostname, fqdn_len);
}
r = n_dhcp4_client_probe_config_append_option (config,
NM_DHCP_OPTION_DHCP4_CLIENT_FQDN,
buffer,
3 + r);
3 + fqdn_len);
if (r) {
nm_utils_error_set_errno (error, r, "failed to set DHCP FQDN: %s");
return FALSE;