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);
}
/*% Prints the config data structure to the FILE. */
lwres_result_t
lwres_conf_print(lwres_context_t *ctx, FILE *fp) {
int i;
int af;
char tmp[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
const char *p;
lwres_conf_t *confdata;
lwres_addr_t tmpaddr;
REQUIRE(ctx != NULL);
confdata = &ctx->confdata;
REQUIRE(confdata->nsnext <= LWRES_CONFMAXNAMESERVERS);
for (i = 0; i < confdata->nsnext; i++) {
af = lwresaddr2af(confdata->nameservers[i].family);
p = lwres_net_ntop(af, confdata->nameservers[i].address,
tmp, sizeof(tmp));
if (p != tmp)
return (LWRES_R_FAILURE);
fprintf(fp, "nameserver %s\n", tmp);
}
for (i = 0; i < confdata->lwnext; i++) {
af = lwresaddr2af(confdata->lwservers[i].family);
p = lwres_net_ntop(af, confdata->lwservers[i].address,
tmp, sizeof(tmp));
if (p != tmp)
return (LWRES_R_FAILURE);
fprintf(fp, "lwserver %s\n", tmp);
}
if (confdata->domainname != NULL) {
fprintf(fp, "domain %s\n", confdata->domainname);
} else if (confdata->searchnxt > 0) {
REQUIRE(confdata->searchnxt <= LWRES_CONFMAXSEARCH);
fprintf(fp, "search");
for (i = 0; i < confdata->searchnxt; i++)
fprintf(fp, " %s", confdata->search[i]);
fputc('\n', fp);
}
REQUIRE(confdata->sortlistnxt <= LWRES_CONFMAXSORTLIST);
if (confdata->sortlistnxt > 0) {
fputs("sortlist", fp);
for (i = 0; i < confdata->sortlistnxt; i++) {
af = lwresaddr2af(confdata->sortlist[i].addr.family);
p = lwres_net_ntop(af,
confdata->sortlist[i].addr.address,
tmp, sizeof(tmp));
if (p != tmp)
return (LWRES_R_FAILURE);
fprintf(fp, " %s", tmp);
tmpaddr = confdata->sortlist[i].mask;
memset(&tmpaddr.address, 0xff, tmpaddr.length);
if (memcmp(&tmpaddr.address,
confdata->sortlist[i].mask.address,
confdata->sortlist[i].mask.length) != 0) {
af = lwresaddr2af(
confdata->sortlist[i].mask.family);
p = lwres_net_ntop
(af,
confdata->sortlist[i].mask.address,
tmp, sizeof(tmp));
if (p != tmp)
return (LWRES_R_FAILURE);
fprintf(fp, "/%s", tmp);
}
}
fputc('\n', fp);
}
if (confdata->resdebug)
fprintf(fp, "options debug\n");
if (confdata->ndots > 0)
fprintf(fp, "options ndots:%d\n", confdata->ndots);
if (confdata->no_tld_query)
fprintf(fp, "options no_tld_query\n");
return (LWRES_R_SUCCESS);
}
