702 lines
20 KiB
C
702 lines
20 KiB
C
/*-*- 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 <nss.h>
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#include <netdb.h>
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#include "sd-bus.h"
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#include "sd-login.h"
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#include "macro.h"
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#include "util.h"
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#include "nss-util.h"
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#include "bus-util.h"
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#include "bus-common-errors.h"
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#include "in-addr-util.h"
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NSS_GETHOSTBYNAME_PROTOTYPES(mymachines);
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NSS_GETPW_PROTOTYPES(mymachines);
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NSS_GETGR_PROTOTYPES(mymachines);
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static int count_addresses(sd_bus_message *m, int 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', "iay")) > 0) {
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int family;
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r = sd_bus_message_read(m, "i", &family);
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if (r < 0)
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return r;
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r = sd_bus_message_skip(m, "ay");
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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_mymachines_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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struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL;
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_cleanup_bus_message_unref_ sd_bus_message* reply = NULL;
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_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
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_cleanup_free_ int *ifindices = NULL;
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_cleanup_free_ char *class = NULL;
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size_t l, ms, idx;
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unsigned i = 0, c = 0;
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char *r_name;
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int n_ifindices, 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_machine_get_class(name, &class);
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if (r < 0)
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goto fail;
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if (!streq(class, "container")) {
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r = -ENOTTY;
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goto fail;
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}
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n_ifindices = sd_machine_get_ifindices(name, &ifindices);
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if (n_ifindices < 0) {
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r = n_ifindices;
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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_call_method(bus,
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"org.freedesktop.machine1",
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"/org/freedesktop/machine1",
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"org.freedesktop.machine1.Manager",
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"GetMachineAddresses",
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NULL,
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&reply,
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"s", name);
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if (r < 0)
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goto fail;
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r = sd_bus_message_enter_container(reply, 'a', "(iay)");
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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', "iay")) > 0) {
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int family;
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const void *a;
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size_t sz;
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r = sd_bus_message_read(reply, "i", &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_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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r = -EAFNOSUPPORT;
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goto fail;
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}
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if (sz != FAMILY_ADDRESS_SIZE(family)) {
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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 = n_ifindices == 1 ? ifindices[0] : 0;
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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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/* Explicitly reset all error variables */
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*errnop = 0;
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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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*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_mymachines_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* reply = NULL;
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_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
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_cleanup_free_ char *class = NULL;
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unsigned c = 0, i = 0;
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char *r_name, *r_aliases, *r_addr, *r_addr_list;
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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_machine_get_class(name, &class);
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if (r < 0)
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goto fail;
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if (!streq(class, "container")) {
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r = -ENOTTY;
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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_call_method(bus,
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"org.freedesktop.machine1",
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"/org/freedesktop/machine1",
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"org.freedesktop.machine1.Manager",
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"GetMachineAddresses",
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NULL,
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&reply,
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"s", name);
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if (r < 0)
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goto fail;
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r = sd_bus_message_enter_container(reply, 'a', "(iay)");
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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 = ENOENT;
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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 = FAMILY_ADDRESS_SIZE(af);
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l = strlen(name);
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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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*errnop = ENOMEM;
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*h_errnop = NO_RECOVERY;
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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', "iay")) > 0) {
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int family;
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const void *a;
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size_t sz;
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r = sd_bus_message_read(reply, "i", &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_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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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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/* Explicitly reset all error variables */
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*errnop = 0;
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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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*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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NSS_GETHOSTBYNAME_FALLBACKS(mymachines);
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enum nss_status _nss_mymachines_getpwnam_r(
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const char *name,
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struct passwd *pwd,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_bus_message_unref_ sd_bus_message* reply = NULL;
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_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
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const char *p, *e, *machine;
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uint32_t mapped;
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uid_t uid;
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size_t l;
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int r;
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assert(name);
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assert(pwd);
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p = startswith(name, "vu-");
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if (!p)
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goto not_found;
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e = strrchr(p, '-');
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if (!e || e == p)
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goto not_found;
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r = parse_uid(e + 1, &uid);
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if (r < 0)
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goto not_found;
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machine = strndupa(p, e - p);
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if (!machine_name_is_valid(machine))
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goto not_found;
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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_call_method(bus,
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"org.freedesktop.machine1",
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"/org/freedesktop/machine1",
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"org.freedesktop.machine1.Manager",
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"MapFromMachineUser",
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&error,
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&reply,
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"su",
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machine, (uint32_t) uid);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_USER_MAPPING))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "u", &mapped);
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if (r < 0)
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goto fail;
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l = strlen(name);
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if (buflen < l+1) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy(buffer, name, l+1);
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pwd->pw_name = buffer;
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pwd->pw_uid = mapped;
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pwd->pw_gid = 65534; /* nobody */
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pwd->pw_gecos = buffer;
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pwd->pw_passwd = (char*) "*"; /* locked */
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pwd->pw_dir = (char*) "/";
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pwd->pw_shell = (char*) "/sbin/nologin";
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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enum nss_status _nss_mymachines_getpwuid_r(
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uid_t uid,
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struct passwd *pwd,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_bus_message_unref_ sd_bus_message* reply = NULL;
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_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
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const char *machine, *object;
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uint32_t mapped;
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int r;
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if (UID_IS_INVALID(uid)) {
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r = -EINVAL;
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goto fail;
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}
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/* We consider all uids < 65536 host uids */
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if (uid < 0x10000)
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goto not_found;
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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_call_method(bus,
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"org.freedesktop.machine1",
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"/org/freedesktop/machine1",
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"org.freedesktop.machine1.Manager",
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"MapToMachineUser",
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&error,
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&reply,
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"u",
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(uint32_t) uid);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_USER_MAPPING))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "sou", &machine, &object, &mapped);
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if (r < 0)
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goto fail;
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if (snprintf(buffer, buflen, "vu-%s-" UID_FMT, machine, (uid_t) mapped) >= (int) buflen) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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pwd->pw_name = buffer;
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pwd->pw_uid = uid;
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pwd->pw_gid = 65534; /* nobody */
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pwd->pw_gecos = buffer;
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pwd->pw_passwd = (char*) "*"; /* locked */
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pwd->pw_dir = (char*) "/";
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pwd->pw_shell = (char*) "/sbin/nologin";
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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enum nss_status _nss_mymachines_getgrnam_r(
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const char *name,
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struct group *gr,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_bus_message_unref_ sd_bus_message* reply = NULL;
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_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
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const char *p, *e, *machine;
|
|
uint32_t mapped;
|
|
uid_t gid;
|
|
size_t l;
|
|
int r;
|
|
|
|
assert(name);
|
|
assert(gr);
|
|
|
|
p = startswith(name, "vg-");
|
|
if (!p)
|
|
goto not_found;
|
|
|
|
e = strrchr(p, '-');
|
|
if (!e || e == p)
|
|
goto not_found;
|
|
|
|
r = parse_gid(e + 1, &gid);
|
|
if (r < 0)
|
|
goto not_found;
|
|
|
|
machine = strndupa(p, e - p);
|
|
if (!machine_name_is_valid(machine))
|
|
goto not_found;
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = sd_bus_call_method(bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"MapFromMachineGroup",
|
|
&error,
|
|
&reply,
|
|
"su",
|
|
machine, (uint32_t) gid);
|
|
if (r < 0) {
|
|
if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_GROUP_MAPPING))
|
|
goto not_found;
|
|
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_bus_message_read(reply, "u", &mapped);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
l = sizeof(char*) + strlen(name) + 1;
|
|
if (buflen < l) {
|
|
*errnop = ENOMEM;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
memzero(buffer, sizeof(char*));
|
|
strcpy(buffer + sizeof(char*), name);
|
|
|
|
gr->gr_name = buffer + sizeof(char*);
|
|
gr->gr_gid = gid;
|
|
gr->gr_passwd = (char*) "*"; /* locked */
|
|
gr->gr_mem = (char**) buffer;
|
|
|
|
*errnop = 0;
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
not_found:
|
|
*errnop = 0;
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
fail:
|
|
*errnop = -r;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|
|
|
|
enum nss_status _nss_mymachines_getgrgid_r(
|
|
gid_t gid,
|
|
struct group *gr,
|
|
char *buffer, size_t buflen,
|
|
int *errnop) {
|
|
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_message_unref_ sd_bus_message* reply = NULL;
|
|
_cleanup_bus_flush_close_unref_ sd_bus *bus = NULL;
|
|
const char *machine, *object;
|
|
uint32_t mapped;
|
|
int r;
|
|
|
|
if (GID_IS_INVALID(gid)) {
|
|
r = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
/* We consider all gids < 65536 host gids */
|
|
if (gid < 0x10000)
|
|
goto not_found;
|
|
|
|
r = sd_bus_open_system(&bus);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
r = sd_bus_call_method(bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"MapToMachineGroup",
|
|
&error,
|
|
&reply,
|
|
"u",
|
|
(uint32_t) gid);
|
|
if (r < 0) {
|
|
if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_GROUP_MAPPING))
|
|
goto not_found;
|
|
|
|
goto fail;
|
|
}
|
|
|
|
r = sd_bus_message_read(reply, "sou", &machine, &object, &mapped);
|
|
if (r < 0)
|
|
goto fail;
|
|
|
|
if (buflen < sizeof(char*) + 1) {
|
|
*errnop = ENOMEM;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
memzero(buffer, sizeof(char*));
|
|
if (snprintf(buffer + sizeof(char*), buflen - sizeof(char*), "vg-%s-" GID_FMT, machine, (gid_t) mapped) >= (int) buflen) {
|
|
*errnop = ENOMEM;
|
|
return NSS_STATUS_TRYAGAIN;
|
|
}
|
|
|
|
gr->gr_name = buffer + sizeof(char*);
|
|
gr->gr_gid = gid;
|
|
gr->gr_passwd = (char*) "*"; /* locked */
|
|
gr->gr_mem = (char**) buffer;
|
|
|
|
*errnop = 0;
|
|
return NSS_STATUS_SUCCESS;
|
|
|
|
not_found:
|
|
*errnop = 0;
|
|
return NSS_STATUS_NOTFOUND;
|
|
|
|
fail:
|
|
*errnop = -r;
|
|
return NSS_STATUS_UNAVAIL;
|
|
}
|