static int
test_isc_netaddr_masktoprefixlen(void) {
struct in_addr na_a;
struct in_addr na_b;
struct in_addr na_c;
struct in_addr na_d;
isc_netaddr_t ina_a;
isc_netaddr_t ina_b;
isc_netaddr_t ina_c;
isc_netaddr_t ina_d;
unsigned int plen;
if (inet_pton(AF_INET, "0.0.0.0", &na_a) < 0)
return T_FAIL;
if (inet_pton(AF_INET, "255.255.255.254", &na_b) < 0)
return T_FAIL;
if (inet_pton(AF_INET, "255.255.255.255", &na_c) < 0)
return T_FAIL;
if (inet_pton(AF_INET, "255.255.255.0", &na_d) < 0)
return T_FAIL;
isc_netaddr_fromin(&ina_a, &na_a);
isc_netaddr_fromin(&ina_b, &na_b);
isc_netaddr_fromin(&ina_c, &na_c);
isc_netaddr_fromin(&ina_d, &na_d);
if (isc_netaddr_masktoprefixlen(&ina_a, &plen) != ISC_R_SUCCESS)
return T_FAIL;
if (plen != 0)
return T_FAIL;
if (isc_netaddr_masktoprefixlen(&ina_b, &plen) != ISC_R_SUCCESS)
return T_FAIL;
if (plen != 31)
return T_FAIL;
if (isc_netaddr_masktoprefixlen(&ina_c, &plen) != ISC_R_SUCCESS)
return T_FAIL;
if (plen != 32)
return T_FAIL;
if (isc_netaddr_masktoprefixlen(&ina_d, &plen) != ISC_R_SUCCESS)
return T_FAIL;
if (plen != 24)
return T_FAIL;
return T_PASS;
}
static isc_result_t
setup_locals(ns_interfacemgr_t *mgr, isc_interface_t *interface) {
isc_result_t result;
unsigned int prefixlen;
isc_netaddr_t *netaddr;
netaddr = &interface->address;
/* First add localhost address */
prefixlen = (netaddr->family == AF_INET) ? 32 : 128;
result = dns_iptable_addprefix(mgr->aclenv.localhost->iptable,
netaddr, prefixlen, ISC_TRUE);
if (result != ISC_R_SUCCESS)
return (result);
/* Then add localnets prefix */
result = isc_netaddr_masktoprefixlen(&interface->netmask,
&prefixlen);
/* Non contiguous netmasks not allowed by IPv6 arch. */
if (result != ISC_R_SUCCESS && netaddr->family == AF_INET6)
return (result);
if (result != ISC_R_SUCCESS) {
isc_log_write(IFMGR_COMMON_LOGARGS, ISC_LOG_WARNING,
"omitting IPv4 interface %s from "
"localnets ACL: %s", interface->name,
isc_result_totext(result));
return (ISC_R_SUCCESS);
}
if (prefixlen == 0U) {
isc_log_write(IFMGR_COMMON_LOGARGS, ISC_LOG_WARNING,
"omitting %s interface %s from localnets ACL: "
"zero prefix length detected",
(netaddr->family == AF_INET) ? "IPv4" : "IPv6",
interface->name);
return (ISC_R_SUCCESS);
}
result = dns_iptable_addprefix(mgr->aclenv.localnets->iptable,
netaddr, prefixlen, ISC_TRUE);
if (result != ISC_R_SUCCESS)
return (result);
return (ISC_R_SUCCESS);
}
int
sockaddr_masktoprefixlen(
const sockaddr_u * psa
)
{
isc_netaddr_t isc_na;
isc_sockaddr_t isc_sa;
u_int pfxlen;
isc_result_t result;
int rc;
ZERO(isc_sa);
memcpy(&isc_sa.type, psa,
min(sizeof(isc_sa.type), sizeof(*psa)));
isc_netaddr_fromsockaddr(&isc_na, &isc_sa);
result = isc_netaddr_masktoprefixlen(&isc_na, &pfxlen);
rc = (ISC_R_SUCCESS == result)
? (int)pfxlen
: -1;
return rc;
}
/*
* Convert a resolv.conf file into a config structure.
*/
isc_result_t
ns_lwresd_parseeresolvconf(isc_mem_t *mctx, cfg_parser_t *pctx,
cfg_obj_t **configp)
{
char text[4096];
char str[16];
isc_buffer_t b;
lwres_context_t *lwctx = NULL;
lwres_conf_t *lwc = NULL;
isc_sockaddr_t sa;
isc_netaddr_t na;
int i;
isc_result_t result;
lwres_result_t lwresult;
lwctx = NULL;
lwresult = lwres_context_create(&lwctx, mctx, ns__lwresd_memalloc,
ns__lwresd_memfree,
LWRES_CONTEXT_SERVERMODE);
if (lwresult != LWRES_R_SUCCESS) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
lwresult = lwres_conf_parse(lwctx, lwresd_g_resolvconffile);
if (lwresult != LWRES_R_SUCCESS) {
result = DNS_R_SYNTAX;
goto cleanup;
}
lwc = lwres_conf_get(lwctx);
INSIST(lwc != NULL);
isc_buffer_init(&b, text, sizeof(text));
CHECK(buffer_putstr(&b, "options {\n"));
/*
* Build the list of forwarders.
*/
if (lwc->nsnext > 0) {
CHECK(buffer_putstr(&b, "\tforwarders {\n"));
for (i = 0; i < lwc->nsnext; i++) {
CHECK(lwaddr_sockaddr_fromlwresaddr(
&sa,
&lwc->nameservers[i],
ns_g_port));
isc_netaddr_fromsockaddr(&na, &sa);
CHECK(buffer_putstr(&b, "\t\t"));
CHECK(isc_netaddr_totext(&na, &b));
CHECK(buffer_putstr(&b, ";\n"));
}
CHECK(buffer_putstr(&b, "\t};\n"));
}
/*
* Build the sortlist
*/
if (lwc->sortlistnxt > 0) {
CHECK(buffer_putstr(&b, "\tsortlist {\n"));
CHECK(buffer_putstr(&b, "\t\t{\n"));
CHECK(buffer_putstr(&b, "\t\t\tany;\n"));
CHECK(buffer_putstr(&b, "\t\t\t{\n"));
for (i = 0; i < lwc->sortlistnxt; i++) {
lwres_addr_t *lwaddr = &lwc->sortlist[i].addr;
lwres_addr_t *lwmask = &lwc->sortlist[i].mask;
unsigned int mask;
CHECK(lwaddr_sockaddr_fromlwresaddr(&sa, lwmask, 0));
isc_netaddr_fromsockaddr(&na, &sa);
result = isc_netaddr_masktoprefixlen(&na, &mask);
if (result != ISC_R_SUCCESS) {
char addrtext[ISC_NETADDR_FORMATSIZE];
isc_netaddr_format(&na, addrtext,
sizeof(addrtext));
isc_log_write(ns_g_lctx,
NS_LOGCATEGORY_GENERAL,
NS_LOGMODULE_LWRESD,
ISC_LOG_ERROR,
"processing sortlist: '%s' is "
"not a valid netmask",
addrtext);
goto cleanup;
}
CHECK(lwaddr_sockaddr_fromlwresaddr(&sa, lwaddr, 0));
isc_netaddr_fromsockaddr(&na, &sa);
CHECK(buffer_putstr(&b, "\t\t\t\t"));
CHECK(isc_netaddr_totext(&na, &b));
snprintf(str, sizeof(str), "%u", mask);
CHECK(buffer_putstr(&b, "/"));
CHECK(buffer_putstr(&b, str));
CHECK(buffer_putstr(&b, ";\n"));
}
CHECK(buffer_putstr(&b, "\t\t\t};\n"));
CHECK(buffer_putstr(&b, "\t\t};\n"));
CHECK(buffer_putstr(&b, "\t};\n"));
}
CHECK(buffer_putstr(&b, "};\n\n"));
CHECK(buffer_putstr(&b, "lwres {\n"));
/*
* Build the search path
*/
if (lwc->searchnxt > 0) {
if (lwc->searchnxt > 0) {
CHECK(buffer_putstr(&b, "\tsearch {\n"));
for (i = 0; i < lwc->searchnxt; i++) {
CHECK(buffer_putstr(&b, "\t\t\""));
CHECK(buffer_putstr(&b, lwc->search[i]));
CHECK(buffer_putstr(&b, "\";\n"));
}
CHECK(buffer_putstr(&b, "\t};\n"));
}
}
/*
* Build the ndots line
*/
if (lwc->ndots != 1) {
CHECK(buffer_putstr(&b, "\tndots "));
snprintf(str, sizeof(str), "%u", lwc->ndots);
CHECK(buffer_putstr(&b, str));
CHECK(buffer_putstr(&b, ";\n"));
}
/*
* Build the listen-on line
*/
if (lwc->lwnext > 0) {
CHECK(buffer_putstr(&b, "\tlisten-on {\n"));
for (i = 0; i < lwc->lwnext; i++) {
CHECK(lwaddr_sockaddr_fromlwresaddr(&sa,
&lwc->lwservers[i],
0));
isc_netaddr_fromsockaddr(&na, &sa);
CHECK(buffer_putstr(&b, "\t\t"));
CHECK(isc_netaddr_totext(&na, &b));
CHECK(buffer_putstr(&b, ";\n"));
}
CHECK(buffer_putstr(&b, "\t};\n"));
}
CHECK(buffer_putstr(&b, "};\n"));
#if 0
printf("%.*s\n",
(int)isc_buffer_usedlength(&b),
(char *)isc_buffer_base(&b));
#endif
lwres_conf_clear(lwctx);
lwres_context_destroy(&lwctx);
return (cfg_parse_buffer(pctx, &b, &cfg_type_namedconf, configp));
cleanup:
if (lwctx != NULL) {
lwres_conf_clear(lwctx);
lwres_context_destroy(&lwctx);
}
return (result);
}
