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Make nsupdate use OS-supplied ephemeral port range

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Make nsupdate 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 2019-03-06 14:01:24 +01:00
parent 960ddd5381
commit 06f582f23e
1 changed files with 31 additions and 0 deletions
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31
bin/nsupdate/nsupdate.c
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@ -33,6 +33,7 @@
#include <isc/mem.h>
#include <isc/nonce.h>
#include <isc/parseint.h>
#include <isc/portset.h>
#include <isc/print.h>
#include <isc/platform.h>
#include <isc/random.h>
@ -748,6 +749,34 @@ shutdown_program(isc_task_t *task, isc_event_t *event) {
maybeshutdown();
}
/*
* Try honoring the operating system's preferred ephemeral port range.
*/
static void
set_source_ports(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(gmctx, &v4portset);
check_result(result, "isc_portset_create (v4)");
result = isc_net_getudpportrange(AF_INET, &udpport_low, &udpport_high);
check_result(result, "isc_net_getudpportrange (v4)");
isc_portset_addrange(v4portset, udpport_low, udpport_high);
result = isc_portset_create(gmctx, &v6portset);
check_result(result, "isc_portset_create (v6)");
result = isc_net_getudpportrange(AF_INET6, &udpport_low, &udpport_high);
check_result(result, "isc_net_getudpportrange (v6)");
isc_portset_addrange(v6portset, udpport_low, udpport_high);
result = dns_dispatchmgr_setavailports(manager, v4portset, v6portset);
check_result(result, "dns_dispatchmgr_setavailports");
isc_portset_destroy(gmctx, &v4portset);
isc_portset_destroy(gmctx, &v6portset);
}
static void
setup_system(void) {
isc_result_t result;
@ -898,6 +927,8 @@ setup_system(void) {
check_result(result, "dst_lib_init");
is_dst_up = true;
set_source_ports(dispatchmgr);
attrmask = DNS_DISPATCHATTR_UDP | DNS_DISPATCHATTR_TCP;
attrmask |= DNS_DISPATCHATTR_IPV4 | DNS_DISPATCHATTR_IPV6;