2014-07-16 03:31:30 +02:00
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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2015-10-24 22:58:24 +02:00
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#include <dlfcn.h>
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2014-07-16 03:31:30 +02:00
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#include <errno.h>
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2015-10-24 22:58:24 +02:00
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#include <netdb.h>
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#include <nss.h>
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2014-07-16 03:31:30 +02:00
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#include <stdlib.h>
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2015-10-24 22:58:24 +02:00
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#include <string.h>
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2014-07-16 03:31:30 +02:00
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#include "sd-bus.h"
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2015-10-24 22:58:24 +02:00
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2014-12-10 19:00:46 +01:00
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#include "bus-common-errors.h"
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2015-10-24 22:58:24 +02:00
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#include "in-addr-util.h"
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2014-07-16 03:31:30 +02:00
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#include "macro.h"
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#include "nss-util.h"
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2015-10-24 22:58:24 +02:00
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#include "string-util.h"
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2014-07-16 03:31:30 +02:00
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#include "util.h"
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NSS_GETHOSTBYNAME_PROTOTYPES(resolve);
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NSS_GETHOSTBYADDR_PROTOTYPES(resolve);
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#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
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2014-08-01 01:55:15 +02:00
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typedef void (*voidfunc_t)(void);
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static voidfunc_t find_fallback(const char *module, const char *symbol) {
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void *dl;
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/* Try to find a fallback NSS module symbol */
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dl = dlopen(module, RTLD_LAZY|RTLD_NODELETE);
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if (!dl)
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return NULL;
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return dlsym(dl, symbol);
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}
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static bool bus_error_shall_fallback(sd_bus_error *e) {
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return sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN) ||
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sd_bus_error_has_name(e, SD_BUS_ERROR_NAME_HAS_NO_OWNER) ||
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sd_bus_error_has_name(e, SD_BUS_ERROR_NO_REPLY) ||
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sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED);
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}
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2014-07-18 16:09:30 +02:00
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static int count_addresses(sd_bus_message *m, int af, const char **canonical) {
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2015-08-17 23:54:08 +02:00
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int c = 0, r;
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2014-07-16 03:31:30 +02:00
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assert(m);
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2014-07-16 22:50:41 +02:00
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assert(canonical);
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2015-08-17 23:54:08 +02:00
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r = sd_bus_message_enter_container(m, 'a', "(iiay)");
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2014-07-16 22:50:41 +02:00
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if (r < 0)
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return r;
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2014-07-16 03:31:30 +02:00
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2015-08-17 23:54:08 +02:00
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while ((r = sd_bus_message_enter_container(m, 'r', "iiay")) > 0) {
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int family, ifindex;
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2014-08-14 01:00:15 +02:00
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2015-08-17 23:54:08 +02:00
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assert_cc(sizeof(int32_t) == sizeof(int));
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2014-07-16 03:31:30 +02:00
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2015-08-17 23:54:08 +02:00
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r = sd_bus_message_read(m, "ii", &ifindex, &family);
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2014-07-16 03:31:30 +02:00
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if (r < 0)
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return r;
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2014-08-14 01:00:15 +02:00
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r = sd_bus_message_skip(m, "ay");
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2014-07-16 03:31:30 +02:00
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if (r < 0)
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return r;
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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if (af != AF_UNSPEC && family != af)
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continue;
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c ++;
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}
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if (r < 0)
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return r;
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2014-07-16 22:50:41 +02:00
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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r = sd_bus_message_read(m, "s", canonical);
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2014-07-16 03:31:30 +02:00
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if (r < 0)
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return r;
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2014-07-16 22:50:41 +02:00
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r = sd_bus_message_rewind(m, true);
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if (r < 0)
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return r;
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return c;
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2014-07-16 03:31:30 +02:00
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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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tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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2014-07-16 03:31:30 +02:00
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struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL;
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tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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2014-07-16 22:50:41 +02:00
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const char *canonical = NULL;
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2014-07-16 03:31:30 +02:00
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size_t l, ms, idx;
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char *r_name;
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2015-08-17 23:54:08 +02:00
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int c, r, i = 0;
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2014-07-16 03:31:30 +02:00
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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 = sd_bus_open_system(&bus);
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if (r < 0)
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goto fail;
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r = sd_bus_message_new_method_call(
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bus,
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&req,
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"org.freedesktop.resolve1",
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"/org/freedesktop/resolve1",
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"org.freedesktop.resolve1.Manager",
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"ResolveHostname");
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if (r < 0)
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goto fail;
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r = sd_bus_message_set_auto_start(req, false);
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if (r < 0)
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goto fail;
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|
2014-08-14 01:00:15 +02:00
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r = sd_bus_message_append(req, "isit", 0, name, AF_UNSPEC, (uint64_t) 0);
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2014-07-16 03:31:30 +02:00
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if (r < 0)
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goto fail;
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r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
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*errnop = ESRCH;
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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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|
2014-08-01 01:55:15 +02:00
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if (bus_error_shall_fallback(&error)) {
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enum nss_status (*fallback)(
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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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fallback = (enum nss_status (*)(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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find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyname4_r");
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if (fallback)
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return fallback(name, pat, buffer, buflen, errnop, h_errnop, ttlp);
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}
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|
2014-07-16 03:31:30 +02:00
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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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}
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|
2014-07-16 22:50:41 +02:00
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c = count_addresses(reply, AF_UNSPEC, &canonical);
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if (c < 0) {
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r = c;
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2014-07-16 03:31:30 +02:00
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goto fail;
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2014-07-16 22:50:41 +02:00
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}
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if (c == 0) {
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2014-07-16 03:31:30 +02:00
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*errnop = ESRCH;
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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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2014-07-16 22:50:41 +02:00
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if (isempty(canonical))
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canonical = name;
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l = strlen(canonical);
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2014-07-16 03:31:30 +02:00
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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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*errnop = ENOMEM;
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*h_errnop = TRY_AGAIN;
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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;
|
2014-07-16 22:50:41 +02:00
|
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|
memcpy(r_name, canonical, l+1);
|
2014-07-16 03:31:30 +02:00
|
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|
idx = ALIGN(l+1);
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|
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/* Second, append addresses */
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r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
|
2014-07-16 22:50:41 +02:00
|
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|
2015-08-17 23:54:08 +02:00
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r = sd_bus_message_enter_container(reply, 'a', "(iiay)");
|
2014-07-16 22:50:41 +02:00
|
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if (r < 0)
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goto fail;
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|
2015-08-17 23:54:08 +02:00
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while ((r = sd_bus_message_enter_container(reply, 'r', "iiay")) > 0) {
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|
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int family, ifindex;
|
2014-07-16 03:31:30 +02:00
|
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|
const void *a;
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|
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size_t sz;
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|
2015-08-17 23:54:08 +02:00
|
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|
assert_cc(sizeof(int32_t) == sizeof(int));
|
|
|
|
|
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r = sd_bus_message_read(reply, "ii", &ifindex, &family);
|
2014-07-16 03:31:30 +02:00
|
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|
if (r < 0)
|
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|
goto fail;
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
if (ifindex < 0) {
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r = -EINVAL;
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goto fail;
|
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|
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}
|
|
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|
2014-07-16 03:31:30 +02:00
|
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r = sd_bus_message_read_array(reply, 'y', &a, &sz);
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|
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if (r < 0)
|
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goto fail;
|
|
|
|
|
|
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r = sd_bus_message_exit_container(reply);
|
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|
|
if (r < 0)
|
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|
goto fail;
|
|
|
|
|
|
|
|
if (!IN_SET(family, AF_INET, AF_INET6))
|
|
|
|
continue;
|
|
|
|
|
2014-07-18 02:36:10 +02:00
|
|
|
if (sz != FAMILY_ADDRESS_SIZE(family)) {
|
2014-07-16 03:31:30 +02:00
|
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|
r = -EINVAL;
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|
goto fail;
|
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}
|
|
|
|
|
|
|
|
r_tuple = (struct gaih_addrtuple*) (buffer + idx);
|
|
|
|
r_tuple->next = i == c-1 ? NULL : (struct gaih_addrtuple*) ((char*) r_tuple + ALIGN(sizeof(struct gaih_addrtuple)));
|
|
|
|
r_tuple->name = r_name;
|
|
|
|
r_tuple->family = family;
|
|
|
|
r_tuple->scopeid = ifindex;
|
|
|
|
memcpy(r_tuple->addr, a, sz);
|
|
|
|
|
|
|
|
idx += ALIGN(sizeof(struct gaih_addrtuple));
|
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|
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i++;
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|
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}
|
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|
|
if (r < 0)
|
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|
|
goto fail;
|
|
|
|
|
2014-07-16 22:50:41 +02:00
|
|
|
assert(i == c);
|
2014-07-16 03:31:30 +02:00
|
|
|
assert(idx == ms);
|
|
|
|
|
|
|
|
if (*pat)
|
|
|
|
**pat = *r_tuple_first;
|
|
|
|
else
|
|
|
|
*pat = r_tuple_first;
|
|
|
|
|
|
|
|
if (ttlp)
|
|
|
|
*ttlp = 0;
|
|
|
|
|
2014-08-01 16:01:12 +02:00
|
|
|
/* Explicitly reset all error variables */
|
|
|
|
*errnop = 0;
|
|
|
|
*h_errnop = NETDB_SUCCESS;
|
|
|
|
h_errno = 0;
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
*errnop = -r;
|
|
|
|
*h_errnop = NO_DATA;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
|
|
|
enum nss_status _nss_resolve_gethostbyname3_r(
|
|
|
|
const char *name,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp,
|
|
|
|
char **canonp) {
|
|
|
|
|
tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
|
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL;
|
|
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
2014-07-16 03:31:30 +02:00
|
|
|
char *r_name, *r_aliases, *r_addr, *r_addr_list;
|
tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
|
|
|
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
|
2014-07-16 03:31:30 +02:00
|
|
|
size_t l, idx, ms, alen;
|
2014-07-16 22:50:41 +02:00
|
|
|
const char *canonical;
|
2015-08-17 23:54:08 +02:00
|
|
|
int c, r, i = 0;
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
assert(name);
|
|
|
|
assert(result);
|
|
|
|
assert(buffer);
|
|
|
|
assert(errnop);
|
|
|
|
assert(h_errnop);
|
|
|
|
|
|
|
|
if (af == AF_UNSPEC)
|
|
|
|
af = AF_INET;
|
|
|
|
|
|
|
|
if (af != AF_INET && af != AF_INET6) {
|
|
|
|
r = -EAFNOSUPPORT;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
|
|
bus,
|
|
|
|
&req,
|
|
|
|
"org.freedesktop.resolve1",
|
|
|
|
"/org/freedesktop/resolve1",
|
|
|
|
"org.freedesktop.resolve1.Manager",
|
|
|
|
"ResolveHostname");
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_set_auto_start(req, false);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2014-08-14 01:00:15 +02:00
|
|
|
r = sd_bus_message_append(req, "isit", 0, name, af, (uint64_t) 0);
|
2014-07-16 03:31:30 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
|
|
|
|
if (r < 0) {
|
|
|
|
if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
|
|
|
|
*errnop = ESRCH;
|
|
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
}
|
|
|
|
|
2014-08-01 01:55:15 +02:00
|
|
|
if (bus_error_shall_fallback(&error)) {
|
|
|
|
|
|
|
|
enum nss_status (*fallback)(
|
|
|
|
const char *name,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp,
|
|
|
|
char **canonp);
|
|
|
|
|
2015-06-08 20:53:16 +02:00
|
|
|
fallback = (enum nss_status (*)(const char *name,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp,
|
|
|
|
char **canonp))
|
2014-08-01 01:55:15 +02:00
|
|
|
find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyname3_r");
|
|
|
|
if (fallback)
|
|
|
|
return fallback(name, af, result, buffer, buflen, errnop, h_errnop, ttlp, canonp);
|
|
|
|
}
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
*errnop = -r;
|
|
|
|
*h_errnop = NO_RECOVERY;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
2014-07-16 22:50:41 +02:00
|
|
|
c = count_addresses(reply, af, &canonical);
|
|
|
|
if (c < 0) {
|
|
|
|
r = c;
|
2014-07-16 03:31:30 +02:00
|
|
|
goto fail;
|
2014-07-16 22:50:41 +02:00
|
|
|
}
|
|
|
|
if (c == 0) {
|
2014-07-16 03:31:30 +02:00
|
|
|
*errnop = ESRCH;
|
|
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
}
|
|
|
|
|
2014-07-16 22:50:41 +02:00
|
|
|
if (isempty(canonical))
|
|
|
|
canonical = name;
|
|
|
|
|
2014-07-18 02:36:10 +02:00
|
|
|
alen = FAMILY_ADDRESS_SIZE(af);
|
2014-07-16 22:50:41 +02:00
|
|
|
l = strlen(canonical);
|
2014-07-16 03:31:30 +02:00
|
|
|
|
2014-09-18 23:55:46 +02:00
|
|
|
ms = ALIGN(l+1) + c * ALIGN(alen) + (c+2) * sizeof(char*);
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
if (buflen < ms) {
|
|
|
|
*errnop = ENOMEM;
|
|
|
|
*h_errnop = TRY_AGAIN;
|
|
|
|
return NSS_STATUS_TRYAGAIN;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* First, append name */
|
|
|
|
r_name = buffer;
|
2014-07-16 22:50:41 +02:00
|
|
|
memcpy(r_name, canonical, l+1);
|
2014-07-16 03:31:30 +02:00
|
|
|
idx = ALIGN(l+1);
|
|
|
|
|
2014-07-16 22:50:41 +02:00
|
|
|
/* Second, create empty aliases array */
|
2014-07-16 03:31:30 +02:00
|
|
|
r_aliases = buffer + idx;
|
|
|
|
((char**) r_aliases)[0] = NULL;
|
|
|
|
idx += sizeof(char*);
|
|
|
|
|
|
|
|
/* Third, append addresses */
|
|
|
|
r_addr = buffer + idx;
|
2014-07-16 22:50:41 +02:00
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
r = sd_bus_message_enter_container(reply, 'a', "(iiay)");
|
2014-08-14 01:00:15 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
while ((r = sd_bus_message_enter_container(reply, 'r', "iiay")) > 0) {
|
|
|
|
int ifindex, family;
|
2014-07-16 03:31:30 +02:00
|
|
|
const void *a;
|
|
|
|
size_t sz;
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
r = sd_bus_message_read(reply, "ii", &ifindex, &family);
|
2014-07-16 03:31:30 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
if (ifindex < 0) {
|
|
|
|
r = -EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
r = sd_bus_message_read_array(reply, 'y', &a, &sz);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_exit_container(reply);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
if (family != af)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (sz != alen) {
|
|
|
|
r = -EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
|
|
|
memcpy(r_addr + i*ALIGN(alen), a, alen);
|
|
|
|
i++;
|
|
|
|
}
|
2014-07-16 22:50:41 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
assert(i == c);
|
|
|
|
idx += c * ALIGN(alen);
|
|
|
|
|
2014-07-16 22:50:41 +02:00
|
|
|
/* Fourth, append address pointer array */
|
2014-07-16 03:31:30 +02:00
|
|
|
r_addr_list = buffer + idx;
|
|
|
|
for (i = 0; i < c; i++)
|
|
|
|
((char**) r_addr_list)[i] = r_addr + i*ALIGN(alen);
|
|
|
|
|
|
|
|
((char**) r_addr_list)[i] = NULL;
|
|
|
|
idx += (c+1) * sizeof(char*);
|
|
|
|
|
|
|
|
assert(idx == ms);
|
|
|
|
|
|
|
|
result->h_name = r_name;
|
|
|
|
result->h_aliases = (char**) r_aliases;
|
|
|
|
result->h_addrtype = af;
|
|
|
|
result->h_length = alen;
|
|
|
|
result->h_addr_list = (char**) r_addr_list;
|
|
|
|
|
2014-08-01 16:01:12 +02:00
|
|
|
/* Explicitly reset all error variables */
|
|
|
|
*errnop = 0;
|
|
|
|
*h_errnop = NETDB_SUCCESS;
|
|
|
|
h_errno = 0;
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
if (ttlp)
|
|
|
|
*ttlp = 0;
|
|
|
|
|
|
|
|
if (canonp)
|
|
|
|
*canonp = r_name;
|
|
|
|
|
|
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
*errnop = -r;
|
|
|
|
*h_errnop = NO_DATA;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
|
|
|
enum nss_status _nss_resolve_gethostbyaddr2_r(
|
|
|
|
const void* addr, socklen_t len,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp) {
|
|
|
|
|
tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
|
|
|
_cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL;
|
|
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
2014-07-16 03:31:30 +02:00
|
|
|
char *r_name, *r_aliases, *r_addr, *r_addr_list;
|
tree-wide: expose "p"-suffix unref calls in public APIs to make gcc cleanup easy
GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
2015-11-27 19:13:45 +01:00
|
|
|
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
|
2014-07-16 03:31:30 +02:00
|
|
|
unsigned c = 0, i = 0;
|
|
|
|
size_t ms = 0, idx;
|
|
|
|
const char *n;
|
2014-08-14 01:00:15 +02:00
|
|
|
int r, ifindex;
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
assert(addr);
|
|
|
|
assert(result);
|
|
|
|
assert(buffer);
|
|
|
|
assert(errnop);
|
|
|
|
assert(h_errnop);
|
|
|
|
|
|
|
|
if (!IN_SET(af, AF_INET, AF_INET6)) {
|
|
|
|
*errnop = EAFNOSUPPORT;
|
|
|
|
*h_errnop = NO_DATA;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
2014-07-18 02:36:10 +02:00
|
|
|
if (len != FAMILY_ADDRESS_SIZE(af)) {
|
2014-07-16 03:31:30 +02:00
|
|
|
*errnop = EINVAL;
|
|
|
|
*h_errnop = NO_RECOVERY;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
|
|
bus,
|
|
|
|
&req,
|
|
|
|
"org.freedesktop.resolve1",
|
|
|
|
"/org/freedesktop/resolve1",
|
|
|
|
"org.freedesktop.resolve1.Manager",
|
|
|
|
"ResolveAddress");
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_set_auto_start(req, false);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2014-08-14 01:00:15 +02:00
|
|
|
r = sd_bus_message_append(req, "ii", 0, af);
|
2014-07-16 03:31:30 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_append_array(req, 'y', addr, len);
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2014-08-14 01:00:15 +02:00
|
|
|
r = sd_bus_message_append(req, "t", (uint64_t) 0);
|
2014-07-16 03:31:30 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
|
|
|
|
if (r < 0) {
|
|
|
|
if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
|
|
|
|
*errnop = ESRCH;
|
|
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
}
|
|
|
|
|
2014-08-01 01:55:15 +02:00
|
|
|
if (bus_error_shall_fallback(&error)) {
|
|
|
|
|
|
|
|
enum nss_status (*fallback)(
|
|
|
|
const void* addr, socklen_t len,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp);
|
|
|
|
|
|
|
|
fallback = (enum nss_status (*)(
|
|
|
|
const void* addr, socklen_t len,
|
|
|
|
int af,
|
|
|
|
struct hostent *result,
|
|
|
|
char *buffer, size_t buflen,
|
|
|
|
int *errnop, int *h_errnop,
|
|
|
|
int32_t *ttlp))
|
|
|
|
find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyaddr2_r");
|
|
|
|
|
|
|
|
if (fallback)
|
|
|
|
return fallback(addr, len, af, result, buffer, buflen, errnop, h_errnop, ttlp);
|
|
|
|
}
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
*errnop = -r;
|
|
|
|
*h_errnop = NO_RECOVERY;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
r = sd_bus_message_enter_container(reply, 'a', "(is)");
|
2014-08-14 01:00:15 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
while ((r = sd_bus_message_read(reply, "(is)", &ifindex, &n)) > 0) {
|
2014-08-14 01:00:15 +02:00
|
|
|
|
2015-08-17 23:54:08 +02:00
|
|
|
if (ifindex < 0) {
|
|
|
|
r = -EINVAL;
|
|
|
|
goto fail;
|
|
|
|
}
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
c++;
|
|
|
|
ms += ALIGN(strlen(n) + 1);
|
|
|
|
}
|
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
r = sd_bus_message_rewind(reply, false);
|
|
|
|
if (r < 0)
|
|
|
|
return r;
|
|
|
|
|
|
|
|
if (c <= 0) {
|
|
|
|
*errnop = ESRCH;
|
|
|
|
*h_errnop = HOST_NOT_FOUND;
|
|
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
}
|
|
|
|
|
|
|
|
ms += ALIGN(len) + /* the address */
|
|
|
|
2 * sizeof(char*) + /* pointers to the address, plus trailing NULL */
|
|
|
|
c * sizeof(char*); /* pointers to aliases, plus trailing NULL */
|
|
|
|
|
|
|
|
if (buflen < ms) {
|
|
|
|
*errnop = ENOMEM;
|
|
|
|
*h_errnop = TRY_AGAIN;
|
|
|
|
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;
|
2015-08-17 23:54:08 +02:00
|
|
|
while ((r = sd_bus_message_read(reply, "(is)", &ifindex, &n)) > 0) {
|
2014-07-16 03:31:30 +02:00
|
|
|
char *p;
|
|
|
|
size_t l;
|
|
|
|
|
|
|
|
l = strlen(n);
|
|
|
|
p = buffer + idx;
|
|
|
|
memcpy(p, n, l+1);
|
|
|
|
|
2016-01-26 18:26:48 +01:00
|
|
|
if (i > 0)
|
2014-07-16 03:31:30 +02:00
|
|
|
((char**) r_aliases)[i-1] = p;
|
|
|
|
i++;
|
|
|
|
|
|
|
|
idx += ALIGN(l+1);
|
|
|
|
}
|
2014-07-16 22:50:41 +02:00
|
|
|
if (r < 0)
|
|
|
|
goto fail;
|
2014-07-16 03:31:30 +02:00
|
|
|
|
|
|
|
((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;
|
|
|
|
|
2014-08-01 16:01:12 +02:00
|
|
|
/* Explicitly reset all error variables */
|
|
|
|
*errnop = 0;
|
|
|
|
*h_errnop = NETDB_SUCCESS;
|
|
|
|
h_errno = 0;
|
|
|
|
|
2014-07-16 03:31:30 +02:00
|
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
*errnop = -r;
|
|
|
|
*h_errnop = NO_DATA;
|
|
|
|
return NSS_STATUS_UNAVAIL;
|
|
|
|
}
|
|
|
|
|
|
|
|
NSS_GETHOSTBYNAME_FALLBACKS(resolve);
|
|
|
|
NSS_GETHOSTBYADDR_FALLBACKS(resolve);
|