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Make delv use OS-supplied ephemeral port range

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Make delv honor the operating system's preferred ephemeral port range
instead of always using the default 1024-65535 range for outgoing
messages.
This commit is contained in:
Michał Kępień
2019-03-08 13:13:32 +01:00
parent 99138abe38
commit ada6846a10
1 changed files with 44 additions and 0 deletions
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44
lib/dns/client.c
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@@ -18,6 +18,7 @@
#include <isc/buffer.h>
#include <isc/mem.h>
#include <isc/mutex.h>
#include <isc/portset.h>
#include <isc/safe.h>
#include <isc/sockaddr.h>
#include <isc/socket.h>
@@ -250,6 +251,48 @@ static isc_result_t request_soa(updatectx_t *uctx);
static void client_resfind(resctx_t *rctx, dns_fetchevent_t *event);
static isc_result_t send_update(updatectx_t *uctx);
/*
* Try honoring the operating system's preferred ephemeral port range.
*/
static isc_result_t
setsourceports(isc_mem_t *mctx, dns_dispatchmgr_t *manager) {
isc_portset_t *v4portset = NULL, *v6portset = NULL;
in_port_t udpport_low, udpport_high;
isc_result_t result;
result = isc_portset_create(mctx, &v4portset);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = isc_net_getudpportrange(AF_INET, &udpport_low, &udpport_high);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
isc_portset_addrange(v4portset, udpport_low, udpport_high);
result = isc_portset_create(mctx, &v6portset);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
result = isc_net_getudpportrange(AF_INET6, &udpport_low, &udpport_high);
if (result != ISC_R_SUCCESS) {
goto cleanup;
}
isc_portset_addrange(v6portset, udpport_low, udpport_high);
result = dns_dispatchmgr_setavailports(manager, v4portset, v6portset);
cleanup:
if (v4portset != NULL) {
isc_portset_destroy(mctx, &v4portset);
}
if (v6portset != NULL) {
isc_portset_destroy(mctx, &v6portset);
}
return (result);
}
static isc_result_t
getudpdispatch(int family, dns_dispatchmgr_t *dispatchmgr,
isc_socketmgr_t *socketmgr, isc_taskmgr_t *taskmgr,
@@ -466,6 +509,7 @@ dns_client_createx(isc_mem_t *mctx, isc_appctx_t *actx,
if (result != ISC_R_SUCCESS)
goto cleanup;
client->dispatchmgr = dispatchmgr;
(void)setsourceports(mctx, dispatchmgr);
/*
* If only one address family is specified, use it.