./tools/notsd-move

4 files changed, 917 insertions, 0 deletions

diff --git a/src/grp-machine/nss-mymachines/Makefile b/src/grp-machine/nss-mymachines/Makefile
new file mode 100644
index 0000000000..5e3d878b23
--- /dev/null
+++ b/src/grp-machine/nss-mymachines/Makefile
@@ -0,0 +1,45 @@
+#  -*- Mode: makefile; indent-tabs-mode: t -*-
+#
+#  This file is part of systemd.
+#
+#  Copyright 2010-2012 Lennart Poettering
+#  Copyright 2010-2012 Kay Sievers
+#  Copyright 2013 Zbigniew Jędrzejewski-Szmek
+#  Copyright 2013 David Strauss
+#  Copyright 2016 Luke Shumaker
+#
+#  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.
+#
+#  systemd is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public License
+#  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+include $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk
+include $(topsrcdir)/build-aux/Makefile.head.mk
+
+libnss_mymachines_la_SOURCES = \
+	src/nss-mymachines/nss-mymachines.sym \
+	src/nss-mymachines/nss-mymachines.c
+
+libnss_mymachines_la_LDFLAGS = \
+	-module \
+	-export-dynamic \
+	-avoid-version \
+	-shared \
+	-shrext .so.2 \
+	-Wl,--version-script=$(srcdir)/nss-mymachines.sym
+
+libnss_mymachines_la_LIBADD = \
+	libsystemd-internal.la \
+	libsystemd-basic.la
+
+lib_LTLIBRARIES += \
+	libnss_mymachines.la
+
+include $(topsrcdir)/build-aux/Makefile.tail.mk
diff --git a/src/grp-machine/nss-mymachines/nss-mymachines.c b/src/grp-machine/nss-mymachines/nss-mymachines.c
new file mode 100644
index 0000000000..4299dd7a0b
--- /dev/null
+++ b/src/grp-machine/nss-mymachines/nss-mymachines.c
@@ -0,0 +1,738 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  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.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <netdb.h>
+#include <nss.h>
+
+#include <systemd/sd-bus.h>
+#include <systemd/sd-login.h>
+
+#include "sd-bus/bus-common-errors.h"
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/hostname-util.h"
+#include "systemd-basic/in-addr-util.h"
+#include "systemd-basic/macro.h"
+#include "systemd-basic/nss-util.h"
+#include "systemd-basic/signal-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/user-util.h"
+#include "systemd-basic/util.h"
+
+NSS_GETHOSTBYNAME_PROTOTYPES(mymachines);
+NSS_GETPW_PROTOTYPES(mymachines);
+NSS_GETGR_PROTOTYPES(mymachines);
+
+#define HOST_UID_LIMIT ((uid_t) UINT32_C(0x10000))
+#define HOST_GID_LIMIT ((gid_t) UINT32_C(0x10000))
+
+static int count_addresses(sd_bus_message *m, int af, unsigned *ret) {
+        unsigned c = 0;
+        int r;
+
+        assert(m);
+        assert(ret);
+
+        while ((r = sd_bus_message_enter_container(m, 'r', "iay")) > 0) {
+                int family;
+
+                r = sd_bus_message_read(m, "i", &family);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_skip(m, "ay");
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_exit_container(m);
+                if (r < 0)
+                        return r;
+
+                if (af != AF_UNSPEC && family != af)
+                        continue;
+
+                c++;
+        }
+        if (r < 0)
+                return r;
+
+        r = sd_bus_message_rewind(m, false);
+        if (r < 0)
+                return r;
+
+        *ret = c;
+        return 0;
+}
+
+enum nss_status _nss_mymachines_gethostbyname4_r(
+                const char *name,
+                struct gaih_addrtuple **pat,
+                char *buffer, size_t buflen,
+                int *errnop, int *h_errnop,
+                int32_t *ttlp) {
+
+        struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_free_ int *ifindices = NULL;
+        _cleanup_free_ char *class = NULL;
+        size_t l, ms, idx;
+        unsigned i = 0, c = 0;
+        char *r_name;
+        int n_ifindices, r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        assert(name);
+        assert(pat);
+        assert(buffer);
+        assert(errnop);
+        assert(h_errnop);
+
+        r = sd_machine_get_class(name, &class);
+        if (r < 0)
+                goto fail;
+        if (!streq(class, "container")) {
+                r = -ENOTTY;
+                goto fail;
+        }
+
+        n_ifindices = sd_machine_get_ifindices(name, &ifindices);
+        if (n_ifindices < 0) {
+                r = n_ifindices;
+                goto fail;
+        }
+
+        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",
+                               "GetMachineAddresses",
+                               NULL,
+                               &reply,
+                               "s", name);
+        if (r < 0)
+                goto fail;
+
+        r = sd_bus_message_enter_container(reply, 'a', "(iay)");
+        if (r < 0)
+                goto fail;
+
+        r = count_addresses(reply, AF_UNSPEC, &c);
+        if (r < 0)
+                goto fail;
+
+        if (c <= 0) {
+                *errnop = ESRCH;
+                *h_errnop = HOST_NOT_FOUND;
+                return NSS_STATUS_NOTFOUND;
+        }
+
+        l = strlen(name);
+        ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * c;
+        if (buflen < ms) {
+                *errnop = ENOMEM;
+                *h_errnop = TRY_AGAIN;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        /* First, append name */
+        r_name = buffer;
+        memcpy(r_name, name, l+1);
+        idx = ALIGN(l+1);
+
+        /* Second, append addresses */
+        r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
+        while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
+                int family;
+                const void *a;
+                size_t sz;
+
+                r = sd_bus_message_read(reply, "i", &family);
+                if (r < 0)
+                        goto fail;
+
+                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 (!IN_SET(family, AF_INET, AF_INET6)) {
+                        r = -EAFNOSUPPORT;
+                        goto fail;
+                }
+
+                if (sz != FAMILY_ADDRESS_SIZE(family)) {
+                        r = -EINVAL;
+                        goto fail;
+                }
+
+                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 = n_ifindices == 1 ? ifindices[0] : 0;
+                memcpy(r_tuple->addr, a, sz);
+
+                idx += ALIGN(sizeof(struct gaih_addrtuple));
+                i++;
+        }
+
+        assert(i == c);
+
+        r = sd_bus_message_exit_container(reply);
+        if (r < 0)
+                goto fail;
+
+        assert(idx == ms);
+
+        if (*pat)
+                **pat = *r_tuple_first;
+        else
+                *pat = r_tuple_first;
+
+        if (ttlp)
+                *ttlp = 0;
+
+        /* Explicitly reset all error variables */
+        *errnop = 0;
+        *h_errnop = NETDB_SUCCESS;
+        h_errno = 0;
+
+        return NSS_STATUS_SUCCESS;
+
+fail:
+        *errnop = -r;
+        *h_errnop = NO_DATA;
+        return NSS_STATUS_UNAVAIL;
+}
+
+enum nss_status _nss_mymachines_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) {
+
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        _cleanup_free_ char *class = NULL;
+        unsigned c = 0, i = 0;
+        char *r_name, *r_aliases, *r_addr, *r_addr_list;
+        size_t l, idx, ms, alen;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        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_machine_get_class(name, &class);
+        if (r < 0)
+                goto fail;
+        if (!streq(class, "container")) {
+                r = -ENOTTY;
+                goto fail;
+        }
+
+        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",
+                               "GetMachineAddresses",
+                               NULL,
+                               &reply,
+                               "s", name);
+        if (r < 0)
+                goto fail;
+
+        r = sd_bus_message_enter_container(reply, 'a', "(iay)");
+        if (r < 0)
+                goto fail;
+
+        r = count_addresses(reply, af, &c);
+        if (r < 0)
+                goto fail;
+
+        if (c <= 0) {
+                *errnop = ENOENT;
+                *h_errnop = HOST_NOT_FOUND;
+                return NSS_STATUS_NOTFOUND;
+        }
+
+        alen = FAMILY_ADDRESS_SIZE(af);
+        l = strlen(name);
+
+        ms = ALIGN(l+1) + c * ALIGN(alen) + (c+2) * sizeof(char*);
+
+        if (buflen < ms) {
+                *errnop = ENOMEM;
+                *h_errnop = NO_RECOVERY;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        /* First, append name */
+        r_name = buffer;
+        memcpy(r_name, name, l+1);
+        idx = ALIGN(l+1);
+
+        /* Second, create aliases array */
+        r_aliases = buffer + idx;
+        ((char**) r_aliases)[0] = NULL;
+        idx += sizeof(char*);
+
+        /* Third, append addresses */
+        r_addr = buffer + idx;
+        while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
+                int family;
+                const void *a;
+                size_t sz;
+
+                r = sd_bus_message_read(reply, "i", &family);
+                if (r < 0)
+                        goto fail;
+
+                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++;
+        }
+
+        assert(i == c);
+        idx += c * ALIGN(alen);
+
+        r = sd_bus_message_exit_container(reply);
+        if (r < 0)
+                goto fail;
+
+        /* Third, append address pointer array */
+        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;
+
+        if (ttlp)
+                *ttlp = 0;
+
+        if (canonp)
+                *canonp = r_name;
+
+        /* Explicitly reset all error variables */
+        *errnop = 0;
+        *h_errnop = NETDB_SUCCESS;
+        h_errno = 0;
+
+        return NSS_STATUS_SUCCESS;
+
+fail:
+        *errnop = -r;
+        *h_errnop = NO_DATA;
+        return NSS_STATUS_UNAVAIL;
+}
+
+NSS_GETHOSTBYNAME_FALLBACKS(mymachines);
+
+enum nss_status _nss_mymachines_getpwnam_r(
+                const char *name,
+                struct passwd *pwd,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        const char *p, *e, *machine;
+        uint32_t mapped;
+        uid_t uid;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        assert(name);
+        assert(pwd);
+
+        p = startswith(name, "vu-");
+        if (!p)
+                goto not_found;
+
+        e = strrchr(p, '-');
+        if (!e || e == p)
+                goto not_found;
+
+        if (e - p > HOST_NAME_MAX - 1) /* -1 for the last dash */
+                goto not_found;
+
+        r = parse_uid(e + 1, &uid);
+        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",
+                               "MapFromMachineUser",
+                               &error,
+                               &reply,
+                               "su",
+                               machine, (uint32_t) uid);
+        if (r < 0) {
+                if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_USER_MAPPING))
+                        goto not_found;
+
+                goto fail;
+        }
+
+        r = sd_bus_message_read(reply, "u", &mapped);
+        if (r < 0)
+                goto fail;
+
+        /* Refuse to work if the mapped address is in the host UID range, or if there was no mapping at all. */
+        if (mapped < HOST_UID_LIMIT || mapped == uid)
+                goto not_found;
+
+        l = strlen(name);
+        if (buflen < l+1) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        memcpy(buffer, name, l+1);
+
+        pwd->pw_name = buffer;
+        pwd->pw_uid = mapped;
+        pwd->pw_gid = 65534; /* nobody */
+        pwd->pw_gecos = buffer;
+        pwd->pw_passwd = (char*) "*"; /* locked */
+        pwd->pw_dir = (char*) "/";
+        pwd->pw_shell = (char*) "/sbin/nologin";
+
+        *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_getpwuid_r(
+                uid_t uid,
+                struct passwd *pwd,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        const char *machine, *object;
+        uint32_t mapped;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        if (!uid_is_valid(uid)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* We consider all uids < 65536 host uids */
+        if (uid < HOST_UID_LIMIT)
+                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",
+                               "MapToMachineUser",
+                               &error,
+                               &reply,
+                               "u",
+                               (uint32_t) uid);
+        if (r < 0) {
+                if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_USER_MAPPING))
+                        goto not_found;
+
+                goto fail;
+        }
+
+        r = sd_bus_message_read(reply, "sou", &machine, &object, &mapped);
+        if (r < 0)
+                goto fail;
+
+        if (mapped == uid)
+                goto not_found;
+
+        if (snprintf(buffer, buflen, "vu-%s-" UID_FMT, machine, (uid_t) mapped) >= (int) buflen) {
+                *errnop = ENOMEM;
+                return NSS_STATUS_TRYAGAIN;
+        }
+
+        pwd->pw_name = buffer;
+        pwd->pw_uid = uid;
+        pwd->pw_gid = 65534; /* nobody */
+        pwd->pw_gecos = buffer;
+        pwd->pw_passwd = (char*) "*"; /* locked */
+        pwd->pw_dir = (char*) "/";
+        pwd->pw_shell = (char*) "/sbin/nologin";
+
+        *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_getgrnam_r(
+                const char *name,
+                struct group *gr,
+                char *buffer, size_t buflen,
+                int *errnop) {
+
+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        const char *p, *e, *machine;
+        uint32_t mapped;
+        uid_t gid;
+        size_t l;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        assert(name);
+        assert(gr);
+
+        p = startswith(name, "vg-");
+        if (!p)
+                goto not_found;
+
+        e = strrchr(p, '-');
+        if (!e || e == p)
+                goto not_found;
+
+        if (e - p > HOST_NAME_MAX - 1)  /* -1 for the last dash */
+                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;
+
+        if (mapped < HOST_GID_LIMIT || mapped == gid)
+                goto not_found;
+
+        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_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
+        _cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
+        _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
+        const char *machine, *object;
+        uint32_t mapped;
+        int r;
+
+        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
+
+        if (!gid_is_valid(gid)) {
+                r = -EINVAL;
+                goto fail;
+        }
+
+        /* We consider all gids < 65536 host gids */
+        if (gid < HOST_GID_LIMIT)
+                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 (mapped == gid)
+                goto not_found;
+
+        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;
+}
diff --git a/src/grp-machine/nss-mymachines/nss-mymachines.sym b/src/grp-machine/nss-mymachines/nss-mymachines.sym
new file mode 100644
index 0000000000..0728ac3ba7
--- /dev/null
+++ b/src/grp-machine/nss-mymachines/nss-mymachines.sym
@@ -0,0 +1,21 @@
+/***
+  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_mymachines_gethostbyname_r;
+        _nss_mymachines_gethostbyname2_r;
+        _nss_mymachines_gethostbyname3_r;
+        _nss_mymachines_gethostbyname4_r;
+        _nss_mymachines_getpwnam_r;
+        _nss_mymachines_getpwuid_r;
+        _nss_mymachines_getgrnam_r;
+        _nss_mymachines_getgrgid_r;
+local: *;
+};
diff --git a/src/grp-machine/nss-mymachines/nss-mymachines.xml b/src/grp-machine/nss-mymachines/nss-mymachines.xml
new file mode 100644
index 0000000000..ec047449bf
--- /dev/null
+++ b/src/grp-machine/nss-mymachines/nss-mymachines.xml
@@ -0,0 +1,113 @@
+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  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.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="nss-mymachines" conditional='ENABLE_MACHINED'>
+
+  <refentryinfo>
+    <title>nss-mymachines</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>nss-mymachines</refentrytitle>
+    <manvolnum>8</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>nss-mymachines</refname>
+    <refname>libnss_mymachines.so.2</refname>
+    <refpurpose>Provide hostname resolution for local
+    container instances.</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <para><filename>libnss_mymachines.so.2</filename></para>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>nss-mymachines</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of
+    the GNU C Library (<command>glibc</command>), providing hostname resolution for the names of containers running
+    locally that are registered with
+    <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.  The
+    container names are resolved to the IP addresses of the specific container, ordered by their scope. This
+    functionality only applies to containers using network namespacing.</para>
+
+    <para>The module also resolves user and group IDs used by containers to user and group names indicating the
+    container name, and back. This functionality only applies to containers using user namespacing.</para>
+
+    <para>To activate the NSS module, add <literal>mymachines</literal> to the lines starting with
+    <literal>hosts:</literal>, <literal>passwd:</literal> and <literal>group:</literal> in
+    <filename>/etc/nsswitch.conf</filename>.</para>
+
+    <para>It is recommended to place <literal>mymachines</literal> after the <literal>files</literal> or
+    <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines to make sure that its mappings
+    are preferred over other resolvers such as DNS, but so that <filename>/etc/hosts</filename>,
+    <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Example</title>
+
+    <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables
+    <command>nss-mymachines</command> correctly:</para>
+
+    <programlisting>passwd:         compat <command>mymachines</command>
+group:          compat <command>mymachines</command>
+shadow:         compat
+
+hosts:          files <command>mymachines</command> resolve myhostname
+networks:       files
+
+protocols:      db files
+services:       db files
+ethers:         db files
+rpc:            db files
+
+netgroup:       nis</programlisting>
+
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>