662 lines
21 KiB
C
662 lines
21 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <netdb.h>
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#include <nss.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "errno-util.h"
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#include "in-addr-util.h"
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#include "macro.h"
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#include "nss-util.h"
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#include "resolved-def.h"
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#include "signal-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "varlink.h"
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NSS_GETHOSTBYNAME_PROTOTYPES(resolve);
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NSS_GETHOSTBYADDR_PROTOTYPES(resolve);
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static bool error_shall_fallback(const char *error_id) {
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return STR_IN_SET(error_id,
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VARLINK_ERROR_DISCONNECTED,
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VARLINK_ERROR_TIMEOUT,
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VARLINK_ERROR_PROTOCOL,
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VARLINK_ERROR_INTERFACE_NOT_FOUND,
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VARLINK_ERROR_METHOD_NOT_FOUND,
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VARLINK_ERROR_METHOD_NOT_IMPLEMENTED);
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}
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static int connect_to_resolved(Varlink **ret) {
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_cleanup_(varlink_unrefp) Varlink *link = NULL;
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int r;
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r = varlink_connect_address(&link, "/run/systemd/resolve/io.systemd.Resolve");
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if (r < 0)
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return r;
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r = varlink_set_relative_timeout(link, SD_RESOLVED_QUERY_TIMEOUT_USEC);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(link);
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return 0;
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}
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static uint32_t ifindex_to_scopeid(int family, const void *a, int ifindex) {
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struct in6_addr in6;
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if (family != AF_INET6)
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return 0;
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/* Some apps can't deal with the scope ID attached to non-link-local addresses. Hence, let's suppress that. */
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assert(sizeof(in6) == FAMILY_ADDRESS_SIZE(AF_INET6));
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memcpy(&in6, a, sizeof(struct in6_addr));
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return IN6_IS_ADDR_LINKLOCAL(&in6) ? ifindex : 0;
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}
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static int json_dispatch_ifindex(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
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int *ifi = userdata;
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intmax_t t;
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assert(variant);
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assert(ifi);
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if (!json_variant_is_integer(variant))
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name));
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t = json_variant_integer(variant);
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if (t <= 0 || t > INT_MAX)
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is out of bounds for an interface index.", strna(name));
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*ifi = (int) t;
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return 0;
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}
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static int json_dispatch_family(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
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int *family = userdata;
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intmax_t t;
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assert(variant);
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assert(family);
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if (!json_variant_is_integer(variant))
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an integer.", strna(name));
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t = json_variant_integer(variant);
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if (t < 0 || t > INT_MAX)
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not a valid family.", strna(name));
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*family = (int) t;
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return 0;
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}
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typedef struct ResolveHostnameReply {
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JsonVariant *addresses;
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char *name;
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uint64_t flags;
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} ResolveHostnameReply;
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static void resolve_hostname_reply_destroy(ResolveHostnameReply *p) {
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assert(p);
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json_variant_unref(p->addresses);
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free(p->name);
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}
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static const JsonDispatch resolve_hostname_reply_dispatch_table[] = {
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{ "addresses", JSON_VARIANT_ARRAY, json_dispatch_variant, offsetof(ResolveHostnameReply, addresses), JSON_MANDATORY },
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{ "name", JSON_VARIANT_STRING, json_dispatch_string, offsetof(ResolveHostnameReply, name), 0 },
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{ "flags", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(ResolveHostnameReply, flags), 0 },
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{}
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};
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typedef struct AddressParameters {
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int ifindex;
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int family;
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union in_addr_union address;
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size_t address_size;
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} AddressParameters;
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static int json_dispatch_address(const char *name, JsonVariant *variant, JsonDispatchFlags flags, void *userdata) {
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AddressParameters *p = userdata;
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union in_addr_union buf = {};
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JsonVariant *i;
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size_t n, k = 0;
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assert(variant);
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assert(p);
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if (!json_variant_is_array(variant))
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is not an array.", strna(name));
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n = json_variant_elements(variant);
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if (!IN_SET(n, 4, 16))
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "JSON field '%s' is array of unexpected size.", strna(name));
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JSON_VARIANT_ARRAY_FOREACH(i, variant) {
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intmax_t b;
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if (!json_variant_is_integer(i))
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "Element %zu of JSON field '%s' is not an integer.", k, strna(name));
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b = json_variant_integer(i);
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if (b < 0 || b > 0xff)
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return json_log(variant, flags, SYNTHETIC_ERRNO(EINVAL), "Element %zu of JSON field '%s' is out of range 0…255.", k, strna(name));
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buf.bytes[k++] = (uint8_t) b;
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}
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p->address = buf;
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p->address_size = k;
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return 0;
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}
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static const JsonDispatch address_parameters_dispatch_table[] = {
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{ "ifindex", JSON_VARIANT_INTEGER, json_dispatch_ifindex, offsetof(AddressParameters, ifindex), 0 },
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{ "family", JSON_VARIANT_INTEGER, json_dispatch_family, offsetof(AddressParameters, family), JSON_MANDATORY },
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{ "address", JSON_VARIANT_ARRAY, json_dispatch_address, 0, JSON_MANDATORY },
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{}
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};
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enum nss_status _nss_resolve_gethostbyname4_r(
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const char *name,
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struct gaih_addrtuple **pat,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp) {
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_cleanup_(resolve_hostname_reply_destroy) ResolveHostnameReply p = {};
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_cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL;
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struct gaih_addrtuple *r_tuple = NULL, *r_tuple_first = NULL;
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_cleanup_(varlink_unrefp) Varlink *link = NULL;
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const char *canonical = NULL, *error_id = NULL;
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JsonVariant *entry, *rparams;
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size_t l, ms, idx, c = 0;
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char *r_name;
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int r;
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PROTECT_ERRNO;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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assert(name);
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assert(pat);
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assert(buffer);
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assert(errnop);
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assert(h_errnop);
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r = connect_to_resolved(&link);
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if (r < 0)
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goto fail;
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r = json_build(&cparams, JSON_BUILD_OBJECT(
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JSON_BUILD_PAIR("name", JSON_BUILD_STRING(name))));
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if (r < 0)
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goto fail;
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r = varlink_call(link, "io.systemd.Resolve.ResolveHostname", cparams, &rparams, &error_id, NULL);
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if (r < 0) {
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if (!error_shall_fallback(error_id))
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goto not_found;
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/* Return NSS_STATUS_UNAVAIL when communication with systemd-resolved fails, allowing falling
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back to other nss modules. Treat all other error conditions as NOTFOUND. This includes
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DNSSEC errors and suchlike. (We don't use UNAVAIL in this case so that the nsswitch.conf
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configuration can distinguish such executed but negative replies from complete failure to
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talk to resolved). */
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goto fail;
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}
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r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, NULL, 0, &p);
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if (r < 0)
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goto fail;
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if (json_variant_is_blank_object(p.addresses))
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goto not_found;
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JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) {
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AddressParameters q = {};
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r = json_dispatch(entry, address_parameters_dispatch_table, NULL, 0, &q);
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if (r < 0)
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goto fail;
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if (!IN_SET(q.family, AF_INET, AF_INET6))
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continue;
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if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) {
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r = -EINVAL;
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goto fail;
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}
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c++;
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}
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canonical = p.name ?: name;
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l = strlen(canonical);
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ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * c;
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if (buflen < ms) {
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UNPROTECT_ERRNO;
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*errnop = ERANGE;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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/* First, append name */
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r_name = buffer;
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memcpy(r_name, canonical, l+1);
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idx = ALIGN(l+1);
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/* Second, append addresses */
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r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
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JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) {
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AddressParameters q = {};
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r = json_dispatch(entry, address_parameters_dispatch_table, NULL, 0, &q);
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if (r < 0)
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goto fail;
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if (!IN_SET(q.family, AF_INET, AF_INET6))
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continue;
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r_tuple = (struct gaih_addrtuple*) (buffer + idx);
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r_tuple->next = (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple)));
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r_tuple->name = r_name;
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r_tuple->family = q.family;
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r_tuple->scopeid = ifindex_to_scopeid(q.family, &q.address, q.ifindex);
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memcpy(r_tuple->addr, &q.address, q.address_size);
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idx += ALIGN(sizeof(struct gaih_addrtuple));
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}
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assert(r_tuple);
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r_tuple->next = NULL; /* Override last next pointer */
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assert(idx == ms);
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if (*pat)
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**pat = *r_tuple_first;
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else
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*pat = r_tuple_first;
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if (ttlp)
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*ttlp = 0;
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/* Explicitly reset both *h_errnop and h_errno to work around
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* https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
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*h_errnop = NETDB_SUCCESS;
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h_errno = 0;
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return NSS_STATUS_SUCCESS;
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fail:
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UNPROTECT_ERRNO;
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*errnop = -r;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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not_found:
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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enum nss_status _nss_resolve_gethostbyname3_r(
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const char *name,
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int af,
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struct hostent *result,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
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int32_t *ttlp,
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char **canonp) {
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_cleanup_(resolve_hostname_reply_destroy) ResolveHostnameReply p = {};
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_cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL;
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char *r_name, *r_aliases, *r_addr, *r_addr_list;
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_cleanup_(varlink_unrefp) Varlink *link = NULL;
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const char *canonical, *error_id = NULL;
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size_t l, idx, ms, alen, i = 0, c = 0;
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JsonVariant *entry, *rparams;
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int r;
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PROTECT_ERRNO;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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assert(name);
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assert(result);
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assert(buffer);
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assert(errnop);
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assert(h_errnop);
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if (af == AF_UNSPEC)
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af = AF_INET;
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if (!IN_SET(af, AF_INET, AF_INET6)) {
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r = -EAFNOSUPPORT;
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goto fail;
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}
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r = connect_to_resolved(&link);
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if (r < 0)
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goto fail;
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r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("name", JSON_BUILD_STRING(name)),
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JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af))));
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if (r < 0)
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goto fail;
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r = varlink_call(link, "io.systemd.Resolve.ResolveHostname", cparams, &rparams, &error_id, NULL);
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if (r < 0) {
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if (!error_shall_fallback(error_id))
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goto not_found;
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goto fail;
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}
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r = json_dispatch(rparams, resolve_hostname_reply_dispatch_table, NULL, 0, &p);
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if (r < 0)
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goto fail;
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if (json_variant_is_blank_object(p.addresses))
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goto not_found;
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JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) {
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AddressParameters q = {};
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r = json_dispatch(entry, address_parameters_dispatch_table, NULL, 0, &q);
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if (r < 0)
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goto fail;
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if (!IN_SET(q.family, AF_INET, AF_INET6))
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continue;
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if (q.address_size != FAMILY_ADDRESS_SIZE(q.family)) {
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r = -EINVAL;
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goto fail;
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}
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c++;
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}
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canonical = p.name ?: name;
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alen = FAMILY_ADDRESS_SIZE(af);
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l = strlen(canonical);
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ms = ALIGN(l+1) + c*ALIGN(alen) + (c+2) * sizeof(char*);
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if (buflen < ms) {
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UNPROTECT_ERRNO;
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*errnop = ERANGE;
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*h_errnop = NETDB_INTERNAL;
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return NSS_STATUS_TRYAGAIN;
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}
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/* First, append name */
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r_name = buffer;
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memcpy(r_name, canonical, l+1);
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idx = ALIGN(l+1);
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/* Second, create empty aliases array */
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r_aliases = buffer + idx;
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((char**) r_aliases)[0] = NULL;
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idx += sizeof(char*);
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/* Third, append addresses */
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r_addr = buffer + idx;
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JSON_VARIANT_ARRAY_FOREACH(entry, p.addresses) {
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AddressParameters q = {};
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r = json_dispatch(entry, address_parameters_dispatch_table, NULL, 0, &q);
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if (r < 0)
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goto fail;
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if (q.family != af)
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continue;
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if (q.address_size != alen) {
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r = -EINVAL;
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goto fail;
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}
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memcpy(r_addr + i*ALIGN(alen), &q.address, alen);
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i++;
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}
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assert(i == c);
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idx += c * ALIGN(alen);
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/* Fourth, append address pointer array */
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r_addr_list = buffer + idx;
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for (i = 0; i < c; i++)
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((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen);
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((char**) r_addr_list)[i] = NULL;
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idx += (c+1) * sizeof(char*);
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assert(idx == ms);
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result->h_name = r_name;
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result->h_aliases = (char**) r_aliases;
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result->h_addrtype = af;
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result->h_length = alen;
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result->h_addr_list = (char**) r_addr_list;
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if (ttlp)
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*ttlp = 0;
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if (canonp)
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*canonp = r_name;
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/* Explicitly reset both *h_errnop and h_errno to work around
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* https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
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*h_errnop = NETDB_SUCCESS;
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h_errno = 0;
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return NSS_STATUS_SUCCESS;
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fail:
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UNPROTECT_ERRNO;
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*errnop = -r;
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*h_errnop = NO_RECOVERY;
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return NSS_STATUS_UNAVAIL;
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not_found:
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*h_errnop = HOST_NOT_FOUND;
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return NSS_STATUS_NOTFOUND;
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}
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typedef struct ResolveAddressReply {
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JsonVariant *names;
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uint64_t flags;
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} ResolveAddressReply;
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static void resolve_address_reply_destroy(ResolveAddressReply *p) {
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assert(p);
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json_variant_unref(p->names);
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}
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static const JsonDispatch resolve_address_reply_dispatch_table[] = {
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{ "names", JSON_VARIANT_ARRAY, json_dispatch_variant, offsetof(ResolveAddressReply, names), JSON_MANDATORY },
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{ "flags", JSON_VARIANT_UNSIGNED, json_dispatch_uint64, offsetof(ResolveAddressReply, flags), 0 },
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{}
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};
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typedef struct NameParameters {
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int ifindex;
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char *name;
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} NameParameters;
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static void name_parameters_destroy(NameParameters *p) {
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assert(p);
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free(p->name);
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}
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static const JsonDispatch name_parameters_dispatch_table[] = {
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{ "ifindex", JSON_VARIANT_INTEGER, json_dispatch_ifindex, offsetof(NameParameters, ifindex), 0 },
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{ "name", JSON_VARIANT_UNSIGNED, json_dispatch_string, offsetof(NameParameters, name), JSON_MANDATORY },
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{}
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};
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enum nss_status _nss_resolve_gethostbyaddr2_r(
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const void* addr, socklen_t len,
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int af,
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struct hostent *result,
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char *buffer, size_t buflen,
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int *errnop, int *h_errnop,
|
|
int32_t *ttlp) {
|
|
|
|
_cleanup_(resolve_address_reply_destroy) ResolveAddressReply p = {};
|
|
_cleanup_(json_variant_unrefp) JsonVariant *cparams = NULL;
|
|
char *r_name, *r_aliases, *r_addr, *r_addr_list;
|
|
_cleanup_(varlink_unrefp) Varlink *link = NULL;
|
|
JsonVariant *entry, *rparams;
|
|
const char *n, *error_id;
|
|
unsigned c = 0, i = 0;
|
|
size_t ms = 0, idx;
|
|
int r;
|
|
|
|
PROTECT_ERRNO;
|
|
BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
|
|
|
|
assert(addr);
|
|
assert(result);
|
|
assert(buffer);
|
|
assert(errnop);
|
|
assert(h_errnop);
|
|
|
|
if (!IN_SET(af, AF_INET, AF_INET6)) {
|
|
UNPROTECT_ERRNO;
|
|
*errnop = EAFNOSUPPORT;
|
|
*h_errnop = NO_DATA;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
|
|
if (len != FAMILY_ADDRESS_SIZE(af)) {
|
|
r = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
r = connect_to_resolved(&link);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = json_build(&cparams, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("address", JSON_BUILD_BYTE_ARRAY(addr, len)),
|
|
JSON_BUILD_PAIR("family", JSON_BUILD_INTEGER(af))));
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = varlink_call(link, "io.systemd.Resolve.ResolveAddress", cparams, &rparams, &error_id, NULL);
|
|
if (r < 0) {
|
|
if (!error_shall_fallback(error_id))
|
|
goto not_found;
|
|
|
|
goto fail;
|
|
}
|
|
|
|
r = json_dispatch(rparams, resolve_address_reply_dispatch_table, NULL, 0, &p);
|
|
if (r < 0)
|
|
goto fail;
|
|
if (json_variant_is_blank_object(p.names))
|
|
goto not_found;
|
|
|
|
JSON_VARIANT_ARRAY_FOREACH(entry, p.names) {
|
|
_cleanup_(name_parameters_destroy) NameParameters q = {};
|
|
|
|
r = json_dispatch(entry, name_parameters_dispatch_table, NULL, 0, &q);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
ms += ALIGN(strlen(q.name) + 1);
|
|
}
|
|
|
|
ms += ALIGN(len) + /* the address */
|
|
2 * sizeof(char*) + /* pointers to the address, plus trailing NULL */
|
|
json_variant_elements(p.names) * sizeof(char*); /* pointers to aliases, plus trailing NULL */
|
|
|
|
if (buflen < ms) {
|
|
UNPROTECT_ERRNO;
|
|
*errnop = ERANGE;
|
|
*h_errnop = NETDB_INTERNAL;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
/* First, place address */
|
|
r_addr = buffer;
|
|
memcpy(r_addr, addr, len);
|
|
idx = ALIGN(len);
|
|
|
|
/* Second, place address list */
|
|
r_addr_list = buffer + idx;
|
|
((char**) r_addr_list)[0] = r_addr;
|
|
((char**) r_addr_list)[1] = NULL;
|
|
idx += sizeof(char*) * 2;
|
|
|
|
/* Third, reserve space for the aliases array */
|
|
r_aliases = buffer + idx;
|
|
idx += sizeof(char*) * c;
|
|
|
|
/* Fourth, place aliases */
|
|
i = 0;
|
|
r_name = buffer + idx;
|
|
JSON_VARIANT_ARRAY_FOREACH(entry, p.names) {
|
|
_cleanup_(name_parameters_destroy) NameParameters q = {};
|
|
size_t l;
|
|
char *z;
|
|
|
|
r = json_dispatch(entry, name_parameters_dispatch_table, NULL, 0, &q);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
l = strlen(q.name);
|
|
z = buffer + idx;
|
|
memcpy(z, n, l+1);
|
|
|
|
if (i > 0)
|
|
((char**) r_aliases)[i-1] = z;
|
|
i++;
|
|
|
|
idx += ALIGN(l+1);
|
|
}
|
|
|
|
((char**) r_aliases)[c-1] = NULL;
|
|
assert(idx == ms);
|
|
|
|
result->h_name = r_name;
|
|
result->h_aliases = (char**) r_aliases;
|
|
result->h_addrtype = af;
|
|
result->h_length = len;
|
|
result->h_addr_list = (char**) r_addr_list;
|
|
|
|
if (ttlp)
|
|
*ttlp = 0;
|
|
|
|
/* Explicitly reset both *h_errnop and h_errno to work around
|
|
* https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
|
|
*h_errnop = NETDB_SUCCESS;
|
|
h_errno = 0;
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
fail:
|
|
UNPROTECT_ERRNO;
|
|
*errnop = -r;
|
|
*h_errnop = NO_RECOVERY;
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
not_found:
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
return NSS_STATUS_NOTFOUND;
|
|
}
|
|
|
|
NSS_GETHOSTBYNAME_FALLBACKS(resolve);
|
|
NSS_GETHOSTBYADDR_FALLBACKS(resolve);
|