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bridge: Fix static-only DHCP configuration

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For static-only DHCP, i.e. with no <range> but at least one <host>
element within <dhcp> element, we have to add "--dhcp-range IP,static"
option to dnsmasq to actually enable the service. Without this option,
dnsmasq will not respond to DHCP requests.
This commit is contained in:
Jiri Denemark 2010-09-09 16:00:08 +02:00
parent e70880c51b
commit df990b445b
1 changed files with 23 additions and 3 deletions
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26
src/network/bridge_driver.c
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@ -394,6 +394,16 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
int nbleases = 0;
char *pidfileArg;
char buf[1024];
unsigned int ranges;
/*
* For static-only DHCP, i.e. with no range but at least one host element,
* we have to add a special --dhcp-range option to enable the service in
* dnsmasq.
*/
ranges = network->def->nranges;
if (!ranges && network->def->nhosts)
ranges = 1;
/*
* NB, be careful about syntax for dnsmasq options in long format
@ -424,11 +434,11 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
/*2 + *//* --interface virbr0 */
2 + /* --except-interface lo */
2 + /* --listen-address 10.0.0.1 */
(2 * network->def->nranges) + /* --dhcp-range 10.0.0.2,10.0.0.254 */
(2 * ranges) + /* --dhcp-range 10.0.0.2,10.0.0.254 */
/* --dhcp-lease-max=xxx if needed */
(network->def->nranges ? 1 : 0) +
/* --dhcp-no-override if needed */
(network->def->nranges ? 1 : 0) +
(ranges ? 1 : 0) +
/* --dhcp-hostsfile=/var/lib/dnsmasq/$NAME.hostsfile */
(network->def->nhosts > 0 ? 1 : 0) +
/* --enable-tftp --tftp-root /srv/tftp */
@ -496,12 +506,22 @@ networkBuildDnsmasqArgv(virNetworkObjPtr network,
nbleases += network->def->ranges[r].size;
}
if (!network->def->nranges && network->def->nhosts) {
snprintf(buf, sizeof(buf), "%s,static",
network->def->ipAddress);
APPEND_ARG(*argv, i++, "--dhcp-range");
APPEND_ARG(*argv, i++, buf);
}
if (network->def->nranges > 0) {
snprintf(buf, sizeof(buf), "--dhcp-lease-max=%d", nbleases);
APPEND_ARG(*argv, i++, buf);
APPEND_ARG(*argv, i++, "--dhcp-no-override");
}
if (ranges)
APPEND_ARG(*argv, i++, "--dhcp-no-override");
if (network->def->nhosts > 0) {
dnsmasqContext *dctx = dnsmasqContextNew(network->def->name, DNSMASQ_STATE_DIR);
char *hostsfileArg;