[thirdparty/systemd.git] / src / nss-mymachines / nss-mymachines.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */

#include <netdb.h>
#include <nss.h>
#include <pthread.h>

#include "sd-bus.h"
#include "sd-login.h"

#include "alloc-util.h"
#include "bus-common-errors.h"
#include "bus-locator.h"
#include "env-util.h"
#include "errno-util.h"
#include "format-util.h"
#include "hostname-util.h"
#include "in-addr-util.h"
#include "log.h"
#include "macro.h"
#include "memory-util.h"
#include "nss-util.h"
#include "signal-util.h"
#include "string-util.h"

static void setup_logging_once(void) {
        static pthread_once_t once = PTHREAD_ONCE_INIT;
        assert_se(pthread_once(&once, log_parse_environment) == 0);
}

#define NSS_ENTRYPOINT_BEGIN                    \
        BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);       \
        setup_logging_once()

NSS_GETHOSTBYNAME_PROTOTYPES(mymachines);
NSS_GETPW_PROTOTYPES(mymachines);
NSS_GETGR_PROTOTYPES(mymachines);

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;
}

static bool avoid_deadlock(void) {

        /* Check whether this lookup might have a chance of deadlocking because we are called from the service manager
         * code activating systemd-machined.service. After all, we shouldn't synchronously do lookups to
         * systemd-machined if we are required to finish before it can be started. This of course won't detect all
         * possible dead locks of this kind, but it should work for the most obvious cases. */

        if (geteuid() != 0) /* Ignore the env vars unless we are privileged. */
                return false;

        return streq_ptr(getenv("SYSTEMD_ACTIVATION_UNIT"), "systemd-machined.service") &&
               streq_ptr(getenv("SYSTEMD_ACTIVATION_SCOPE"), "system");
}

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;

        PROTECT_ERRNO;
        NSS_ENTRYPOINT_BEGIN;

        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;
        }

        if (avoid_deadlock()) {
                r = -EDEADLK;
                goto fail;
        }

        r = sd_bus_open_system(&bus);
        if (r < 0)
                goto fail;

        r = bus_call_method(bus, bus_machine_mgr, "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) {
                *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) {
                UNPROTECT_ERRNO;
                *errnop = ERANGE;
                *h_errnop = NETDB_INTERNAL;
                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 both *h_errnop and h_errno to work around
         * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
        *h_errnop = NETDB_SUCCESS;
        h_errno = 0;

        return NSS_STATUS_SUCCESS;

fail:
        UNPROTECT_ERRNO;
        *errnop = -r;
        *h_errnop = NO_RECOVERY;
        return NSS_STATUS_UNAVAIL;
}

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;

        PROTECT_ERRNO;
        NSS_ENTRYPOINT_BEGIN;

        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;
        }

        if (avoid_deadlock()) {
                r = -EDEADLK;
                goto fail;
        }

        r = sd_bus_open_system(&bus);
        if (r < 0)
                goto fail;

        r = bus_call_method(bus, bus_machine_mgr, "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) {
                *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) {
                UNPROTECT_ERRNO;
                *errnop = ERANGE;
                *h_errnop = NETDB_INTERNAL;
                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 both *h_errnop and h_errno to work around
         * https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
        *h_errnop = NETDB_SUCCESS;
        h_errno = 0;

        return NSS_STATUS_SUCCESS;

fail:
        UNPROTECT_ERRNO;
        *errnop = -r;
        *h_errnop = NO_RECOVERY;
        return NSS_STATUS_UNAVAIL;
}

NSS_GETHOSTBYNAME_FALLBACKS(mymachines);

enum nss_status _nss_mymachines_getpwnam_r(
                const char *name,
                struct passwd *pwd,
                char *buffer, size_t buflen,
                int *errnop) {

        return NSS_STATUS_NOTFOUND;
}

enum nss_status _nss_mymachines_getpwuid_r(
                uid_t uid,
                struct passwd *pwd,
                char *buffer, size_t buflen,
                int *errnop) {

        return NSS_STATUS_NOTFOUND;
}

enum nss_status _nss_mymachines_getgrnam_r(
                const char *name,
                struct group *gr,
                char *buffer, size_t buflen,
                int *errnop) {

        return NSS_STATUS_NOTFOUND;
}

enum nss_status _nss_mymachines_getgrgid_r(
                gid_t gid,
                struct group *gr,
                char *buffer, size_t buflen,
                int *errnop) {

        return NSS_STATUS_NOTFOUND;
}
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
cabb0bc6	2
cabb0bc6	3	#include <netdb.h>
07630cea	4	#include <nss.h>
e5d5edc3	5	#include <pthread.h>
cabb0bc6 LP	6
	7	#include "sd-bus.h"
	8	#include "sd-login.h"
07630cea	9
b5efdb8a	10	#include "alloc-util.h"
c01ff965	11	#include "bus-common-errors.h"
9b71e4ab	12	#include "bus-locator.h"
6e32c03e	13	#include "env-util.h"
2b2fec7d	14	#include "errno-util.h"
ca78ad1d	15	#include "format-util.h"
25300b5a	16	#include "hostname-util.h"
07630cea	17	#include "in-addr-util.h"
e5d5edc3	18	#include "log.h"
07630cea	19	#include "macro.h"
0a970718	20	#include "memory-util.h"
07630cea	21	#include "nss-util.h"
0c5eb056	22	#include "signal-util.h"
07630cea	23	#include "string-util.h"
cabb0bc6	24
e5d5edc3 ZJS	25	static void setup_logging_once(void) {
e5d5edc3 ZJS	26	static pthread_once_t once = PTHREAD_ONCE_INIT;
56a5f496	27	assert_se(pthread_once(&once, log_parse_environment) == 0);
e5d5edc3 ZJS	28	}
	29
	30	#define NSS_ENTRYPOINT_BEGIN \
	31	BLOCK_SIGNALS(NSS_SIGNALS_BLOCK); \
	32	setup_logging_once()
	33
cabb0bc6	34	NSS_GETHOSTBYNAME_PROTOTYPES(mymachines);
c01ff965 LP	35	NSS_GETPW_PROTOTYPES(mymachines);
c01ff965 LP	36	NSS_GETGR_PROTOTYPES(mymachines);
cabb0bc6	37
0dd25fb9	38	static int count_addresses(sd_bus_message m, int af, unsigned ret) {
cabb0bc6 LP	39	unsigned c = 0;
	40	int r;
	41
	42	assert(m);
	43	assert(ret);
	44
3a6fb33c	45	while ((r = sd_bus_message_enter_container(m, 'r', "iay")) > 0) {
0dd25fb9	46	int family;
cabb0bc6	47
0dd25fb9	48	r = sd_bus_message_read(m, "i", &family);
cabb0bc6 LP	49	if (r < 0)
	50	return r;
	51
	52	r = sd_bus_message_skip(m, "ay");
	53	if (r < 0)
	54	return r;
	55
	56	r = sd_bus_message_exit_container(m);
	57	if (r < 0)
	58	return r;
	59
	60	if (af != AF_UNSPEC && family != af)
	61	continue;
	62
313cefa1	63	c++;
cabb0bc6 LP	64	}
	65	if (r < 0)
	66	return r;
	67
	68	r = sd_bus_message_rewind(m, false);
	69	if (r < 0)
	70	return r;
	71
	72	*ret = c;
	73	return 0;
	74	}
	75
2f28018c LP	76	static bool avoid_deadlock(void) {
	77
	78	/* Check whether this lookup might have a chance of deadlocking because we are called from the service manager
	79	* code activating systemd-machined.service. After all, we shouldn't synchronously do lookups to
	80	* systemd-machined if we are required to finish before it can be started. This of course won't detect all
	81	* possible dead locks of this kind, but it should work for the most obvious cases. */
	82
	83	if (geteuid() != 0) /* Ignore the env vars unless we are privileged. */
	84	return false;
	85
	86	return streq_ptr(getenv("SYSTEMD_ACTIVATION_UNIT"), "systemd-machined.service") &&
	87	streq_ptr(getenv("SYSTEMD_ACTIVATION_SCOPE"), "system");
	88	}
	89
cabb0bc6 LP	90	enum nss_status _nss_mymachines_gethostbyname4_r(
	91	const char *name,
	92	struct gaih_addrtuple **pat,
	93	char *buffer, size_t buflen,
	94	int errnop, int h_errnop,
	95	int32_t *ttlp) {
	96
	97	struct gaih_addrtuple r_tuple, r_tuple_first = NULL;
4afd3348 LP	98	_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
4afd3348 LP	99	_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
634af566	100	_cleanup_free_ int *ifindices = NULL;
cabb0bc6 LP	101	_cleanup_free_ char *class = NULL;
	102	size_t l, ms, idx;
	103	unsigned i = 0, c = 0;
	104	char *r_name;
634af566	105	int n_ifindices, r;
cabb0bc6	106
06202b9e	107	PROTECT_ERRNO;
e5d5edc3	108	NSS_ENTRYPOINT_BEGIN;
0c5eb056	109
cabb0bc6 LP	110	assert(name);
	111	assert(pat);
	112	assert(buffer);
	113	assert(errnop);
	114	assert(h_errnop);
	115
	116	r = sd_machine_get_class(name, &class);
	117	if (r < 0)
	118	goto fail;
	119	if (!streq(class, "container")) {
	120	r = -ENOTTY;
	121	goto fail;
	122	}
	123
634af566 LP	124	n_ifindices = sd_machine_get_ifindices(name, &ifindices);
	125	if (n_ifindices < 0) {
	126	r = n_ifindices;
cabb0bc6 LP	127	goto fail;
	128	}
	129
2f28018c LP	130	if (avoid_deadlock()) {
	131	r = -EDEADLK;
	132	goto fail;
	133	}
	134
cabb0bc6 LP	135	r = sd_bus_open_system(&bus);
	136	if (r < 0)
	137	goto fail;
	138
7b389878	139	r = bus_call_method(bus, bus_machine_mgr, "GetMachineAddresses", NULL, &reply, "s", name);
cabb0bc6 LP	140	if (r < 0)
	141	goto fail;
	142
0dd25fb9	143	r = sd_bus_message_enter_container(reply, 'a', "(iay)");
cabb0bc6 LP	144	if (r < 0)
	145	goto fail;
	146
	147	r = count_addresses(reply, AF_UNSPEC, &c);
	148	if (r < 0)
	149	goto fail;
	150
	151	if (c <= 0) {
cabb0bc6 LP	152	*h_errnop = HOST_NOT_FOUND;
	153	return NSS_STATUS_NOTFOUND;
	154	}
	155
	156	l = strlen(name);
	157	ms = ALIGN(l+1) + ALIGN(sizeof(struct gaih_addrtuple)) * c;
	158	if (buflen < ms) {
cdccd29f	159	UNPROTECT_ERRNO;
0192cbdb	160	*errnop = ERANGE;
cda458a5	161	*h_errnop = NETDB_INTERNAL;
cabb0bc6 LP	162	return NSS_STATUS_TRYAGAIN;
	163	}
	164
	165	/* First, append name */
	166	r_name = buffer;
	167	memcpy(r_name, name, l+1);
	168	idx = ALIGN(l+1);
	169
	170	/* Second, append addresses */
	171	r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
0dd25fb9 LP	172	while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
0dd25fb9 LP	173	int family;
cabb0bc6 LP	174	const void *a;
	175	size_t sz;
	176
0dd25fb9	177	r = sd_bus_message_read(reply, "i", &family);
cabb0bc6 LP	178	if (r < 0)
	179	goto fail;
	180
	181	r = sd_bus_message_read_array(reply, 'y', &a, &sz);
	182	if (r < 0)
	183	goto fail;
	184
	185	r = sd_bus_message_exit_container(reply);
	186	if (r < 0)
	187	goto fail;
	188
555bd6e9 LP	189	if (!IN_SET(family, AF_INET, AF_INET6)) {
	190	r = -EAFNOSUPPORT;
	191	goto fail;
	192	}
	193
9d485985	194	if (sz != FAMILY_ADDRESS_SIZE(family)) {
cabb0bc6 LP	195	r = -EINVAL;
	196	goto fail;
	197	}
	198
	199	r_tuple = (struct gaih_addrtuple*) (buffer + idx);
	200	r_tuple->next = i == c-1 ? NULL : (struct gaih_addrtuple) ((char) r_tuple + ALIGN(sizeof(struct gaih_addrtuple)));
	201	r_tuple->name = r_name;
	202	r_tuple->family = family;
634af566	203	r_tuple->scopeid = n_ifindices == 1 ? ifindices[0] : 0;
cabb0bc6 LP	204	memcpy(r_tuple->addr, a, sz);
	205
	206	idx += ALIGN(sizeof(struct gaih_addrtuple));
	207	i++;
	208	}
	209
	210	assert(i == c);
	211
	212	r = sd_bus_message_exit_container(reply);
	213	if (r < 0)
	214	goto fail;
	215
	216	assert(idx == ms);
	217
	218	if (*pat)
	219	*pat = r_tuple_first;
	220	else
	221	*pat = r_tuple_first;
	222
	223	if (ttlp)
	224	*ttlp = 0;
	225
06202b9e YW	226	/* Explicitly reset both *h_errnop and h_errno to work around
06202b9e YW	227	* https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
e70df46b LP	228	*h_errnop = NETDB_SUCCESS;
	229	h_errno = 0;
	230
cabb0bc6 LP	231	return NSS_STATUS_SUCCESS;
	232
	233	fail:
cdccd29f	234	UNPROTECT_ERRNO;
0192cbdb	235	*errnop = -r;
2b0c1bfd	236	*h_errnop = NO_RECOVERY;
cabb0bc6 LP	237	return NSS_STATUS_UNAVAIL;
	238	}
	239
	240	enum nss_status _nss_mymachines_gethostbyname3_r(
	241	const char *name,
	242	int af,
	243	struct hostent *result,
	244	char *buffer, size_t buflen,
	245	int errnop, int h_errnop,
	246	int32_t *ttlp,
	247	char **canonp) {
	248
4afd3348 LP	249	_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
4afd3348 LP	250	_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
cabb0bc6 LP	251	_cleanup_free_ char *class = NULL;
	252	unsigned c = 0, i = 0;
	253	char r_name, r_aliases, r_addr, r_addr_list;
	254	size_t l, idx, ms, alen;
	255	int r;
	256
06202b9e	257	PROTECT_ERRNO;
e5d5edc3	258	NSS_ENTRYPOINT_BEGIN;
0c5eb056	259
cabb0bc6 LP	260	assert(name);
	261	assert(result);
	262	assert(buffer);
	263	assert(errnop);
	264	assert(h_errnop);
	265
	266	if (af == AF_UNSPEC)
	267	af = AF_INET;
	268
	269	if (af != AF_INET && af != AF_INET6) {
	270	r = -EAFNOSUPPORT;
	271	goto fail;
	272	}
	273
	274	r = sd_machine_get_class(name, &class);
	275	if (r < 0)
	276	goto fail;
	277	if (!streq(class, "container")) {
	278	r = -ENOTTY;
	279	goto fail;
	280	}
	281
2f28018c LP	282	if (avoid_deadlock()) {
	283	r = -EDEADLK;
	284	goto fail;
	285	}
	286
cabb0bc6 LP	287	r = sd_bus_open_system(&bus);
	288	if (r < 0)
	289	goto fail;
	290
7b389878	291	r = bus_call_method(bus, bus_machine_mgr, "GetMachineAddresses", NULL, &reply, "s", name);
cabb0bc6 LP	292	if (r < 0)
	293	goto fail;
	294
0dd25fb9	295	r = sd_bus_message_enter_container(reply, 'a', "(iay)");
cabb0bc6 LP	296	if (r < 0)
	297	goto fail;
	298
	299	r = count_addresses(reply, af, &c);
	300	if (r < 0)
	301	goto fail;
	302
	303	if (c <= 0) {
cabb0bc6 LP	304	*h_errnop = HOST_NOT_FOUND;
	305	return NSS_STATUS_NOTFOUND;
	306	}
	307
9d485985	308	alen = FAMILY_ADDRESS_SIZE(af);
cabb0bc6 LP	309	l = strlen(name);
cabb0bc6 LP	310
66a16e7e	311	ms = ALIGN(l+1) + c * ALIGN(alen) + (c+2) * sizeof(char*);
cabb0bc6 LP	312
cabb0bc6 LP	313	if (buflen < ms) {
cdccd29f	314	UNPROTECT_ERRNO;
0192cbdb	315	*errnop = ERANGE;
cda458a5	316	*h_errnop = NETDB_INTERNAL;
cabb0bc6 LP	317	return NSS_STATUS_TRYAGAIN;
	318	}
	319
	320	/* First, append name */
	321	r_name = buffer;
	322	memcpy(r_name, name, l+1);
	323	idx = ALIGN(l+1);
	324
	325	/* Second, create aliases array */
	326	r_aliases = buffer + idx;
	327	((char**) r_aliases)[0] = NULL;
	328	idx += sizeof(char*);
	329
	330	/* Third, append addresses */
	331	r_addr = buffer + idx;
0dd25fb9 LP	332	while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
0dd25fb9 LP	333	int family;
cabb0bc6 LP	334	const void *a;
	335	size_t sz;
	336
0dd25fb9	337	r = sd_bus_message_read(reply, "i", &family);
cabb0bc6 LP	338	if (r < 0)
	339	goto fail;
	340
	341	r = sd_bus_message_read_array(reply, 'y', &a, &sz);
	342	if (r < 0)
	343	goto fail;
	344
	345	r = sd_bus_message_exit_container(reply);
	346	if (r < 0)
	347	goto fail;
	348
	349	if (family != af)
	350	continue;
	351
	352	if (sz != alen) {
	353	r = -EINVAL;
	354	goto fail;
	355	}
	356
	357	memcpy(r_addr + i*ALIGN(alen), a, alen);
	358	i++;
	359	}
	360
	361	assert(i == c);
	362	idx += c * ALIGN(alen);
	363
	364	r = sd_bus_message_exit_container(reply);
	365	if (r < 0)
	366	goto fail;
	367
	368	/* Third, append address pointer array */
	369	r_addr_list = buffer + idx;
	370	for (i = 0; i < c; i++)
	371	((char*) r_addr_list)[i] = r_addr + iALIGN(alen);
	372
	373	((char**) r_addr_list)[i] = NULL;
	374	idx += (c+1) * sizeof(char*);
	375
	376	assert(idx == ms);
	377
	378	result->h_name = r_name;
	379	result->h_aliases = (char**) r_aliases;
	380	result->h_addrtype = af;
	381	result->h_length = alen;
	382	result->h_addr_list = (char**) r_addr_list;
	383
	384	if (ttlp)
	385	*ttlp = 0;
	386
	387	if (canonp)
	388	*canonp = r_name;
	389
06202b9e YW	390	/* Explicitly reset both *h_errnop and h_errno to work around
06202b9e YW	391	* https://bugzilla.redhat.com/show_bug.cgi?id=1125975 */
e70df46b LP	392	*h_errnop = NETDB_SUCCESS;
	393	h_errno = 0;
	394
cabb0bc6 LP	395	return NSS_STATUS_SUCCESS;
	396
	397	fail:
cdccd29f	398	UNPROTECT_ERRNO;
0192cbdb	399	*errnop = -r;
2b0c1bfd	400	*h_errnop = NO_RECOVERY;
cabb0bc6 LP	401	return NSS_STATUS_UNAVAIL;
	402	}
	403
c01ff965 LP	404	NSS_GETHOSTBYNAME_FALLBACKS(mymachines);
	405
	406	enum nss_status _nss_mymachines_getpwnam_r(
	407	const char *name,
	408	struct passwd *pwd,
	409	char *buffer, size_t buflen,
	410	int *errnop) {
	411
38ccb557	412	return NSS_STATUS_NOTFOUND;
c01ff965 LP	413	}
	414
	415	enum nss_status _nss_mymachines_getpwuid_r(
	416	uid_t uid,
	417	struct passwd *pwd,
	418	char *buffer, size_t buflen,
	419	int *errnop) {
	420
38ccb557	421	return NSS_STATUS_NOTFOUND;
c01ff965 LP	422	}
	423
	424	enum nss_status _nss_mymachines_getgrnam_r(
	425	const char *name,
	426	struct group *gr,
	427	char *buffer, size_t buflen,
	428	int *errnop) {
	429
38ccb557	430	return NSS_STATUS_NOTFOUND;
c01ff965 LP	431	}
	432
	433	enum nss_status _nss_mymachines_getgrgid_r(
	434	gid_t gid,
	435	struct group *gr,
	436	char *buffer, size_t buflen,
	437	int *errnop) {
	438
38ccb557	439	return NSS_STATUS_NOTFOUND;
c01ff965	440	}