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networkd: DHCP override hostname

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This patch enhances the DHCP client to send the hostname
reference
http://lists.freedesktop.org/archives/systemd-devel/2014-July/021550.html

Tested with
Example conf:

[Match]
Name=eth1

[Network]
DHCP=v4

[DHCP]
SendHostname=true
Hostname=test
This commit is contained in:
Susant Sahani 2015-07-10 15:42:27 +05:30
parent 9b361114f5
commit a7d0ef446e
4 changed files with 70 additions and 13 deletions
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41
src/network/networkd-dhcp4.c
View File

@ -270,12 +270,18 @@ static int dhcp_lease_lost(Link *link) {
if (link->network->dhcp_hostname) {
const char *hostname = NULL;
r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
if (r >= 0 && hostname) {
r = link_set_hostname(link, "");
if (!link->network->hostname)
r = sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
else
hostname = link->network->hostname;
if (r >= 0 || hostname) {
r = link_set_hostname(link, hostname);
if (r < 0)
log_link_error(link,
"Failed to reset transient hostname");
log_link_error_errno(link, r,
"Failed to set transient hostname to '%s': %m",
hostname);
}
}
@ -464,8 +470,12 @@ static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
if (link->network->dhcp_hostname) {
const char *hostname;
r = sd_dhcp_lease_get_hostname(lease, &hostname);
if (r >= 0) {
if (!link->network->hostname)
r = sd_dhcp_lease_get_hostname(lease, &hostname);
else
hostname = link->network->hostname;
if (r >= 0 || hostname) {
r = link_set_hostname(link, hostname);
if (r < 0)
log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
@ -616,14 +626,19 @@ int dhcp4_configure(Link *link) {
if (link->network->dhcp_sendhost) {
_cleanup_free_ char *hostname = NULL;
const char *hn = NULL;
hostname = gethostname_malloc();
if (!hostname)
return -ENOMEM;
if (!link->network->hostname) {
hostname = gethostname_malloc();
if (!hostname)
return -ENOMEM;
if (!is_localhost(hostname)) {
r = sd_dhcp_client_set_hostname(link->dhcp_client,
hostname);
hn = hostname;
} else
hn = link->network->hostname;
if (!is_localhost(hn)) {
r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
if (r < 0)
return r;
}

1
src/network/networkd-network-gperf.gperf
View File

@ -67,6 +67,7 @@ DHCP.UseHostname, config_parse_bool, 0
DHCP.UseDomains, config_parse_bool, 0, offsetof(Network, dhcp_domains)
DHCP.UseRoutes, config_parse_bool, 0, offsetof(Network, dhcp_routes)
DHCP.SendHostname, config_parse_bool, 0, offsetof(Network, dhcp_sendhost)
DHCP.Hostname, config_parse_hostname, 0, offsetof(Network, hostname)
DHCP.RequestBroadcast, config_parse_bool, 0, offsetof(Network, dhcp_broadcast)
DHCP.CriticalConnection, config_parse_bool, 0, offsetof(Network, dhcp_critical)
DHCP.VendorClassIdentifier, config_parse_string, 0, offsetof(Network, dhcp_vendor_class_identifier)

36
src/network/networkd-network.c
View File

@ -207,6 +207,7 @@ void network_free(Network *network) {
free(network->description);
free(network->dhcp_vendor_class_identifier);
free(network->hostname);
free(network->mac);
@ -809,3 +810,38 @@ int config_parse_ipv6_privacy_extensions(
return 0;
}
int config_parse_hostname(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
char **hostname = data;
char *hn = NULL;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
r = config_parse_string(unit, filename, line, section, section_line,
lvalue, ltype, rvalue, &hn, userdata);
if (r < 0)
return r;
if (!hostname_is_valid(hn)) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL, "hostname is not valid, ignoring assignment: %s", rvalue);
free(hn);
return 0;
}
*hostname = hn;
return 0;
}

5
src/network/networkd.h
View File

@ -133,6 +133,7 @@ struct Network {
AddressFamilyBoolean dhcp;
DCHPClientIdentifier dhcp_client_identifier;
char *dhcp_vendor_class_identifier;
char *hostname;
bool dhcp_dns;
bool dhcp_ntp;
bool dhcp_mtu;
@ -473,3 +474,7 @@ const char* ipv6_privacy_extensions_to_string(IPv6PrivacyExtensions i) _const_;
IPv6PrivacyExtensions ipv6_privacy_extensions_from_string(const char *s) _pure_;
int config_parse_ipv6_privacy_extensions(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
/* Hostname */
int config_parse_hostname(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);