resolved: add small NSS module that uses resolved to resolve DNS names
This commit is contained in:
Lennart Poettering
parent
555bd6e95b
commit
4d1cf1e229
20
Makefile.am
20
Makefile.am
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@ -4605,6 +4605,26 @@ test_dns_domain_LDADD = \
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libsystemd-internal.la \
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libsystemd-shared.la
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libnss_resolve_la_SOURCES = \
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src/nss-resolve/nss-resolve.sym \
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src/nss-resolve/nss-resolve.c
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libnss_resolve_la_LDFLAGS = \
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$(AM_LDFLAGS) \
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-module \
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-export-dynamic \
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-avoid-version \
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-shared \
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-shrext .so.2 \
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-Wl,--version-script=$(top_srcdir)/src/nss-resolve/nss-resolve.sym
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libnss_resolve_la_LIBADD = \
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libsystemd-shared.la \
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libsystemd-internal.la
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lib_LTLIBRARIES += \
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libnss_resolve.la
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endif
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# ------------------------------------------------------------------------------
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@ -0,0 +1 @@
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../Makefile
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@ -0,0 +1,585 @@
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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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#include <limits.h>
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#include <nss.h>
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#include <sys/types.h>
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#include <netdb.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include <net/if.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include "sd-bus.h"
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#include "bus-util.h"
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#include "bus-errors.h"
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#include "macro.h"
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#include "nss-util.h"
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#include "util.h"
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#include "in-addr-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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static int count_addresses(sd_bus_message *m, unsigned af, unsigned *ret) {
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unsigned c = 0;
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int r;
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assert(m);
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assert(ret);
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while ((r = sd_bus_message_enter_container(m, 'r', "yayi")) > 0) {
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unsigned char family;
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r = sd_bus_message_read(m, "y", &family);
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if (r < 0)
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return r;
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r = sd_bus_message_skip(m, "ayi");
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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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r = sd_bus_message_rewind(m, false);
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if (r < 0)
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return r;
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*ret = c;
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return 0;
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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_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL;
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_cleanup_bus_unref_ sd_bus *bus = NULL;
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size_t l, ms, idx;
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char *r_name;
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unsigned i = 0, c = 0;
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int r;
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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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r = sd_bus_message_append(req, "sy", name, AF_UNSPEC);
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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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*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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r = sd_bus_message_enter_container(reply, 'a', "(yayi)");
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if (r < 0)
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goto fail;
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r = count_addresses(reply, AF_UNSPEC, &c);
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if (r < 0)
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goto fail;
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if (c <= 0) {
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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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l = strlen(name);
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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;
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memcpy(r_name, name, 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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while ((r = sd_bus_message_enter_container(reply, 'r', "yayi")) > 0) {
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unsigned char family;
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const void *a;
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int ifindex;
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size_t sz;
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r = sd_bus_message_read(reply, "y", &family);
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if (r < 0)
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goto fail;
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r = sd_bus_message_read_array(reply, 'y', &a, &sz);
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if (r < 0)
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goto fail;
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r = sd_bus_message_read(reply, "i", &ifindex);
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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;
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if (!IN_SET(family, AF_INET, AF_INET6))
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continue;
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if (sz != PROTO_ADDRESS_SIZE(family)) {
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r = -EINVAL;
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goto fail;
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}
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if (ifindex < 0) {
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r = -EINVAL;
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goto fail;
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}
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r_tuple = (struct gaih_addrtuple*) (buffer + idx);
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r_tuple->next = i == c-1 ? NULL : (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 = family;
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r_tuple->scopeid = ifindex;
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memcpy(r_tuple->addr, a, sz);
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idx += ALIGN(sizeof(struct gaih_addrtuple));
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i++;
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}
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assert(i == c);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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goto fail;
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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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return NSS_STATUS_SUCCESS;
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fail:
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*errnop = -r;
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*h_errnop = NO_DATA;
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return NSS_STATUS_UNAVAIL;
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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_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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char *r_name, *r_aliases, *r_addr, *r_addr_list;
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_cleanup_bus_unref_ sd_bus *bus = NULL;
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unsigned c = 0, i = 0;
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size_t l, idx, ms, alen;
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int r;
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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 (af != AF_INET && af != AF_INET6) {
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r = -EAFNOSUPPORT;
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goto fail;
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}
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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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r = sd_bus_message_append(req, "sy", name, af);
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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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*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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r = sd_bus_message_enter_container(reply, 'a', "(yayi)");
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if (r < 0)
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goto fail;
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r = count_addresses(reply, af, &c);
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if (r < 0)
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goto fail;
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if (c <= 0) {
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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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alen = PROTO_ADDRESS_SIZE(af);
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l = strlen(name);
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ms = ALIGN(l+1) +
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sizeof(char*) +
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(c > 0 ? c : 1) * ALIGN(alen) +
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(c > 0 ? c+1 : 2) * sizeof(char*);
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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;
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memcpy(r_name, name, l+1);
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idx = ALIGN(l+1);
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/* Second, create 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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while ((r = sd_bus_message_enter_container(reply, 'r', "yayi")) > 0) {
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unsigned char family;
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const void *a;
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int ifindex;
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size_t sz;
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r = sd_bus_message_read(reply, "y", &family);
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if (r < 0)
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goto fail;
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r = sd_bus_message_read_array(reply, 'y', &a, &sz);
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if (r < 0)
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goto fail;
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r = sd_bus_message_read(reply, "i", &ifindex);
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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;
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if (family != af)
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continue;
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if (sz != alen) {
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r = -EINVAL;
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goto fail;
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}
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if (ifindex < 0) {
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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), a, 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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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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goto fail;
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/* Third, 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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return NSS_STATUS_SUCCESS;
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|
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fail:
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*errnop = -r;
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*h_errnop = NO_DATA;
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return NSS_STATUS_UNAVAIL;
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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,
|
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int32_t *ttlp) {
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|
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_cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
|
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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char *r_name, *r_aliases, *r_addr, *r_addr_list;
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_cleanup_bus_unref_ sd_bus *bus = NULL;
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unsigned c = 0, i = 0;
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size_t ms = 0, idx;
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const char *n;
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int r;
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assert(addr);
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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 (!IN_SET(af, AF_INET, AF_INET6)) {
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*errnop = EAFNOSUPPORT;
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*h_errnop = NO_DATA;
|
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return NSS_STATUS_UNAVAIL;
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}
|
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|
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if (len != PROTO_ADDRESS_SIZE(af)) {
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*errnop = EINVAL;
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*h_errnop = NO_RECOVERY;
|
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return NSS_STATUS_UNAVAIL;
|
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}
|
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|
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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",
|
||||
"/org/freedesktop/resolve1",
|
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"org.freedesktop.resolve1.Manager",
|
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"ResolveAddress");
|
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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;
|
||||
|
||||
r = sd_bus_message_append(req, "y", af);
|
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if (r < 0)
|
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goto fail;
|
||||
|
||||
r = sd_bus_message_append_array(req, 'y', addr, len);
|
||||
if (r < 0)
|
||||
goto fail;
|
||||
|
||||
r = sd_bus_message_append(req, "i", 0);
|
||||
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;
|
||||
}
|
||||
|
||||
*errnop = -r;
|
||||
*h_errnop = NO_RECOVERY;
|
||||
return NSS_STATUS_UNAVAIL;
|
||||
}
|
||||
|
||||
r = sd_bus_message_enter_container(reply, 'a', "s");
|
||||
if (r < 0)
|
||||
goto fail;
|
||||
|
||||
while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
|
||||
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;
|
||||
while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
|
||||
char *p;
|
||||
size_t l;
|
||||
|
||||
l = strlen(n);
|
||||
p = buffer + idx;
|
||||
memcpy(p, n, l+1);
|
||||
|
||||
if (i > 1)
|
||||
((char**) r_aliases)[i-1] = p;
|
||||
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;
|
||||
|
||||
return NSS_STATUS_SUCCESS;
|
||||
|
||||
fail:
|
||||
*errnop = -r;
|
||||
*h_errnop = NO_DATA;
|
||||
return NSS_STATUS_UNAVAIL;
|
||||
}
|
||||
|
||||
NSS_GETHOSTBYNAME_FALLBACKS(resolve);
|
||||
NSS_GETHOSTBYADDR_FALLBACKS(resolve);
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
***/
|
||||
|
||||
{
|
||||
global:
|
||||
_nss_resolve_gethostbyname_r;
|
||||
_nss_resolve_gethostbyname2_r;
|
||||
_nss_resolve_gethostbyname3_r;
|
||||
_nss_resolve_gethostbyname4_r;
|
||||
_nss_resolve_gethostbyaddr_r;
|
||||
_nss_resolve_gethostbyaddr2_r;
|
||||
local: *;
|
||||
};
|
||||
|
|
@ -450,7 +450,7 @@ int manager_connect_bus(Manager *m) {
|
|||
return 0;
|
||||
}
|
||||
|
||||
r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1", resolve_vtable, m);
|
||||
r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/resolve1", "org.freedesktop.resolve1.Manager", resolve_vtable, m);
|
||||
if (r < 0) {
|
||||
log_error("Failed to register object: %s", strerror(-r));
|
||||
return r;
|
||||
|
|
|
|||
Loading…
Reference in New Issue