int
main(int argc, char *argv[]) {
lwres_context_t *ctx;
const char *file = "/etc/resolv.conf";
int ret;
#ifdef USE_ISC_MEM
isc_mem_t *mem;
isc_result_t result;
#endif
isc__mem_register();
isc__task_register();
isc__timer_register();
isc__socket_register();
if (argc > 1) {
file = argv[1];
}
#ifdef USE_ISC_MEM
mem = NULL;
result = isc_mem_create(0, 0, &mem);
INSIST(result == ISC_R_SUCCESS);
#endif
ctx = NULL;
#ifdef USE_ISC_MEM
ret = lwres_context_create(&ctx, mem, mem_alloc, mem_free, 0);
#else
ret = lwres_context_create(&ctx, NULL, NULL, NULL, 0);
#endif
CHECK(ret, "lwres_context_create");
lwres_conf_init(ctx);
if (lwres_conf_parse(ctx, file) == 0) {
lwres_conf_print(ctx, stderr);
} else {
perror("lwres_conf_parse");
}
lwres_conf_clear(ctx);
lwres_context_destroy(&ctx);
#ifdef USE_ISC_MEM
isc_mem_stats(mem, stdout);
isc_mem_destroy(&mem);
#endif
return (0);
}
/*
* 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);
}
int
main(int argc, char *argv[]) {
int ret;
#ifdef USE_ISC_MEM
isc_mem_t *mem;
isc_result_t result;
#endif
(void)argc;
(void)argv;
#ifdef USE_ISC_MEM
mem = NULL;
result = isc_mem_create(0, 0, &mem);
INSIST(result == ISC_R_SUCCESS);
#endif
ctx = NULL;
#ifdef USE_ISC_MEM
ret = lwres_context_create(&ctx, mem, mem_alloc, mem_free, 0);
#else
ret = lwres_context_create(&ctx, NULL, NULL, NULL, 0);
#endif
CHECK(ret, "lwres_context_create");
ret = lwres_conf_parse(ctx, "/etc/resolv.conf");
CHECK(ret, "lwres_conf_parse");
lwres_conf_print(ctx, stdout);
test_noop();
/*
* The following comments about tests all assume your search path is
* nominum.com isc.org flame.org
* and ndots is the default of 1.
*/
test_gabn("alias-05.test"); /* exact, then search. */
test_gabn("f.root-servers.net.");
test_gabn("poofball.flame.org.");
test_gabn("foo.ip6.int.");
test_gabn("notthereatall.flame.org"); /* exact, then search (!found)*/
test_gabn("shell"); /* search (found in nominum.com), then exact */
test_gabn("kechara"); /* search (found in flame.org), then exact */
test_gabn("lkasdjlaksjdlkasjdlkasjdlkasjd"); /* search, exact(!found)*/
test_gnba("198.133.199.1", LWRES_ADDRTYPE_V4);
test_gnba("204.152.184.79", LWRES_ADDRTYPE_V4);
test_gnba("3ffe:8050:201:1860:42::1", LWRES_ADDRTYPE_V6);
lwres_conf_clear(ctx);
lwres_context_destroy(&ctx);
#ifdef USE_ISC_MEM
isc_mem_stats(mem, stdout);
isc_mem_destroy(&mem);
#endif
return (0);
}
/*% performs a reverse lookup of address src which is len bytes long. af denotes the protocol family, typically #PF_INET or PF_INET6. */
struct hostent *
lwres_getipnodebyaddr(const void *src, size_t len, int af, int *error_num) {
struct hostent *he1, *he2;
lwres_context_t *lwrctx = NULL;
lwres_gnbaresponse_t *by = NULL;
lwres_result_t n;
union {
const void *konst;
struct in6_addr *in6;
} u;
/*
* Sanity checks.
*/
if (src == NULL) {
*error_num = NO_RECOVERY;
return (NULL);
}
switch (af) {
case AF_INET:
if (len != (unsigned int)INADDRSZ) {
*error_num = NO_RECOVERY;
return (NULL);
}
break;
case AF_INET6:
if (len != (unsigned int)IN6ADDRSZ) {
*error_num = NO_RECOVERY;
return (NULL);
}
break;
default:
*error_num = NO_RECOVERY;
return (NULL);
}
/*
* The de-"const"-ing game is done because at least one
* vendor's system (RedHat 6.0) defines the IN6_IS_ADDR_*
* macros in such a way that they discard the const with
* internal casting, and gcc ends up complaining. Rather
* than replacing their own (possibly optimized) definitions
* with our own, cleanly discarding the const is the easiest
* thing to do.
*/
u.konst = src;
/*
* Look up IPv4 and IPv4 mapped/compatible addresses.
*/
if ((af == AF_INET6 && IN6_IS_ADDR_V4COMPAT(u.in6)) ||
(af == AF_INET6 && IN6_IS_ADDR_V4MAPPED(u.in6)) ||
(af == AF_INET)) {
const unsigned char *cp = src;
if (af == AF_INET6)
cp += 12;
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n == LWRES_R_SUCCESS)
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (n == LWRES_R_SUCCESS)
n = lwres_getnamebyaddr(lwrctx, LWRES_ADDRTYPE_V4,
INADDRSZ, cp, &by);
if (n != LWRES_R_SUCCESS) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (n == LWRES_R_NOTFOUND)
*error_num = HOST_NOT_FOUND;
else
*error_num = NO_RECOVERY;
return (NULL);
}
he1 = hostfromaddr(by, AF_INET, cp);
lwres_gnbaresponse_free(lwrctx, &by);
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (af != AF_INET6)
return (he1);
/*
* Convert from AF_INET to AF_INET6.
*/
he2 = copyandmerge(he1, NULL, af, error_num);
lwres_freehostent(he1);
if (he2 == NULL)
return (NULL);
/*
* Restore original address.
*/
memcpy(he2->h_addr, src, len);
return (he2);
}
/*
* Lookup IPv6 address.
*/
if (memcmp(src, &in6addr_any, IN6ADDRSZ) == 0) {
*error_num = HOST_NOT_FOUND;
return (NULL);
}
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n == LWRES_R_SUCCESS)
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (n == LWRES_R_SUCCESS)
n = lwres_getnamebyaddr(lwrctx, LWRES_ADDRTYPE_V6, IN6ADDRSZ,
src, &by);
if (n != 0) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
if (n == LWRES_R_NOTFOUND)
*error_num = HOST_NOT_FOUND;
else
*error_num = NO_RECOVERY;
return (NULL);
}
he1 = hostfromaddr(by, AF_INET6, src);
lwres_gnbaresponse_free(lwrctx, &by);
if (he1 == NULL)
*error_num = NO_RECOVERY;
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
return (he1);
}
struct hostent *
lwres_getipnodebyname(const char *name, int af, int flags, int *error_num) {
int have_v4 = 1, have_v6 = 1;
struct in_addr in4;
struct in6_addr in6;
struct hostent he, *he1 = NULL, *he2 = NULL, *he3 = NULL;
int v4 = 0, v6 = 0;
int tmp_err = 0;
lwres_context_t *lwrctx = NULL;
lwres_gabnresponse_t *by = NULL;
int n;
/*
* If we care about active interfaces then check.
*/
if ((flags & AI_ADDRCONFIG) != 0)
if (scan_interfaces(&have_v4, &have_v6) == -1) {
*error_num = NO_RECOVERY;
return (NULL);
}
/* Check for literal address. */
if ((v4 = lwres_net_pton(AF_INET, name, &in4)) != 1)
v6 = lwres_net_pton(AF_INET6, name, &in6);
/*
* Impossible combination?
*/
if ((af == AF_INET6 && (flags & AI_V4MAPPED) == 0 && v4 == 1) ||
(af == AF_INET && v6 == 1) ||
(have_v4 == 0 && v4 == 1) ||
(have_v6 == 0 && v6 == 1) ||
(have_v4 == 0 && af == AF_INET) ||
(have_v6 == 0 && af == AF_INET6 &&
(((flags & AI_V4MAPPED) != 0 && have_v4) ||
(flags & AI_V4MAPPED) == 0))) {
*error_num = HOST_NOT_FOUND;
return (NULL);
}
/*
* Literal address?
*/
if (v4 == 1 || v6 == 1) {
char *addr_list[2];
char *aliases[1];
char mappedname[sizeof("::ffff:123.123.123.123")];
union {
const char *const_name;
char *deconst_name;
} u;
u.const_name = name;
if (v4 == 1 && af == AF_INET6) {
strcpy(mappedname, "::ffff:");
lwres_net_ntop(AF_INET, (char *)&in4,
mappedname + sizeof("::ffff:") - 1,
sizeof(mappedname) - sizeof("::ffff:")
+ 1);
he.h_name = mappedname;
} else
he.h_name = u.deconst_name;
he.h_addr_list = addr_list;
he.h_addr_list[0] = (v4 == 1) ? (char *)&in4 : (char *)&in6;
he.h_addr_list[1] = NULL;
he.h_aliases = aliases;
he.h_aliases[0] = NULL;
he.h_length = (v4 == 1) ? INADDRSZ : IN6ADDRSZ;
he.h_addrtype = (v4 == 1) ? AF_INET : AF_INET6;
return (copyandmerge(&he, NULL, af, error_num));
}
n = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (n != 0) {
*error_num = NO_RECOVERY;
goto cleanup;
}
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
tmp_err = NO_RECOVERY;
if (have_v6 && af == AF_INET6) {
n = lwres_getaddrsbyname(lwrctx, name, LWRES_ADDRTYPE_V6, &by);
if (n == 0) {
he1 = hostfromname(by, AF_INET6);
lwres_gabnresponse_free(lwrctx, &by);
if (he1 == NULL) {
*error_num = NO_RECOVERY;
goto cleanup;
}
} else {
if (n == LWRES_R_NOTFOUND)
tmp_err = HOST_NOT_FOUND;
else {
*error_num = NO_RECOVERY;
goto cleanup;
}
}
}
if (have_v4 &&
((af == AF_INET) ||
(af == AF_INET6 && (flags & AI_V4MAPPED) != 0 &&
(he1 == NULL || (flags & AI_ALL) != 0)))) {
n = lwres_getaddrsbyname(lwrctx, name, LWRES_ADDRTYPE_V4, &by);
if (n == 0) {
he2 = hostfromname(by, AF_INET);
lwres_gabnresponse_free(lwrctx, &by);
if (he2 == NULL) {
*error_num = NO_RECOVERY;
goto cleanup;
}
} else if (he1 == NULL) {
if (n == LWRES_R_NOTFOUND)
*error_num = HOST_NOT_FOUND;
else
*error_num = NO_RECOVERY;
goto cleanup;
}
} else
*error_num = tmp_err;
he3 = copyandmerge(he1, he2, af, error_num);
cleanup:
if (he1 != NULL)
lwres_freehostent(he1);
if (he2 != NULL)
lwres_freehostent(he2);
if (lwrctx != NULL) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
}
return (he3);
}
/*% Returns a set of resource records associated with a hostname, class, and type. hostname is a pointer a to null-terminated string. */
int
lwres_getrrsetbyname(const char *hostname, unsigned int rdclass,
unsigned int rdtype, unsigned int flags,
struct rrsetinfo **res)
{
lwres_context_t *lwrctx = NULL;
lwres_result_t lwresult;
lwres_grbnresponse_t *response = NULL;
struct rrsetinfo *rrset = NULL;
unsigned int i;
unsigned int lwflags;
unsigned int result;
if (rdclass > 0xffff || rdtype > 0xffff) {
result = ERRSET_INVAL;
goto fail;
}
/*
* Don't allow queries of class or type ANY
*/
if (rdclass == 0xff || rdtype == 0xff) {
result = ERRSET_INVAL;
goto fail;
}
lwresult = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (lwresult != LWRES_R_SUCCESS) {
result = lwresult_to_result(lwresult);
goto fail;
}
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
/*
* If any input flags were defined, lwflags would be set here
* based on them
*/
UNUSED(flags);
lwflags = 0;
lwresult = lwres_getrdatabyname(lwrctx, hostname,
(lwres_uint16_t)rdclass,
(lwres_uint16_t)rdtype,
lwflags, &response);
if (lwresult != LWRES_R_SUCCESS) {
result = lwresult_to_result(lwresult);
goto fail;
}
rrset = sane_malloc(sizeof(struct rrsetinfo));
if (rrset == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
rrset->rri_name = NULL;
rrset->rri_rdclass = response->rdclass;
rrset->rri_rdtype = response->rdtype;
rrset->rri_ttl = response->ttl;
rrset->rri_flags = 0;
rrset->rri_nrdatas = 0;
rrset->rri_rdatas = NULL;
rrset->rri_nsigs = 0;
rrset->rri_sigs = NULL;
rrset->rri_name = sane_malloc(response->realnamelen + 1);
if (rrset->rri_name == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
strncpy(rrset->rri_name, response->realname, response->realnamelen);
rrset->rri_name[response->realnamelen] = 0;
if ((response->flags & LWRDATA_VALIDATED) != 0)
rrset->rri_flags |= RRSET_VALIDATED;
rrset->rri_nrdatas = response->nrdatas;
rrset->rri_rdatas = sane_calloc(rrset->rri_nrdatas,
sizeof(struct rdatainfo));
if (rrset->rri_rdatas == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
for (i = 0; i < rrset->rri_nrdatas; i++) {
rrset->rri_rdatas[i].rdi_length = response->rdatalen[i];
rrset->rri_rdatas[i].rdi_data =
sane_malloc(rrset->rri_rdatas[i].rdi_length);
if (rrset->rri_rdatas[i].rdi_data == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
memcpy(rrset->rri_rdatas[i].rdi_data, response->rdatas[i],
rrset->rri_rdatas[i].rdi_length);
}
rrset->rri_nsigs = response->nsigs;
rrset->rri_sigs = sane_calloc(rrset->rri_nsigs,
sizeof(struct rdatainfo));
if (rrset->rri_sigs == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
for (i = 0; i < rrset->rri_nsigs; i++) {
rrset->rri_sigs[i].rdi_length = response->siglen[i];
rrset->rri_sigs[i].rdi_data =
sane_malloc(rrset->rri_sigs[i].rdi_length);
if (rrset->rri_sigs[i].rdi_data == NULL) {
result = ERRSET_NOMEMORY;
goto fail;
}
memcpy(rrset->rri_sigs[i].rdi_data, response->sigs[i],
rrset->rri_sigs[i].rdi_length);
}
lwres_grbnresponse_free(lwrctx, &response);
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
*res = rrset;
return (ERRSET_SUCCESS);
fail:
if (rrset != NULL)
lwres_freerrset(rrset);
if (response != NULL)
lwres_grbnresponse_free(lwrctx, &response);
if (lwrctx != NULL) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
}
return (result);
}
static int
add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
int socktype, int port)
{
struct addrinfo *ai;
lwres_context_t *lwrctx = NULL;
lwres_gabnresponse_t *by = NULL;
lwres_addr_t *addr;
lwres_result_t lwres;
int result = 0;
lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
if (lwres != LWRES_R_SUCCESS)
ERR(EAI_FAIL);
(void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
ai = ai_clone(*aip, AF_INET6);
if (ai == NULL) {
lwres_freeaddrinfo(*aip);
ERR(EAI_MEMORY);
}
*aip = ai;
ai->ai_socktype = socktype;
SIN6(ai->ai_addr)->sin6_port = port;
memcpy(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16);
} else {
lwres = lwres_getaddrsbyname(lwrctx, hostname,
LWRES_ADDRTYPE_V6, &by);
if (lwres != LWRES_R_SUCCESS) {
if (lwres == LWRES_R_NOTFOUND)
goto cleanup;
else
ERR(EAI_FAIL);
}
addr = LWRES_LIST_HEAD(by->addrs);
while (addr != NULL) {
ai = ai_clone(*aip, AF_INET6);
if (ai == NULL) {
lwres_freeaddrinfo(*aip);
ERR(EAI_MEMORY);
}
*aip = ai;
ai->ai_socktype = socktype;
SIN6(ai->ai_addr)->sin6_port = port;
memcpy(&SIN6(ai->ai_addr)->sin6_addr,
addr->address, 16);
if (flags & AI_CANONNAME) {
ai->ai_canonname = strdup(by->realname);
if (ai->ai_canonname == NULL)
ERR(EAI_MEMORY);
}
addr = LWRES_LIST_NEXT(addr, link);
}
}
cleanup:
if (by != NULL)
lwres_gabnresponse_free(lwrctx, &by);
if (lwrctx != NULL) {
lwres_conf_clear(lwrctx);
lwres_context_destroy(&lwrctx);
}
return (result);
}
