#include <nss.h>

#include <netdb.h>

#include "sd-bus.h"

#include "sd-login.h"

#include "macro.h"

#include "util.h"

#include "nss-util.h"

#include "bus-util.h"

#include "in-addr-util.h"

NSS_GETHOSTBYNAME_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;

}

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_bus_message_unref_ sd_bus_message* reply = NULL;

_cleanup_bus_flush_close_unref_ 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;

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_bus_message_unref_ sd_bus_message* reply = NULL;

_cleanup_bus_flush_close_unref_ 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;

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)