+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 <nss.h>
-#include <netdb.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <dlfcn.h>
-
-#include "sd-bus.h"
-#include "bus-util.h"
-#include "bus-common-errors.h"
-#include "macro.h"
-#include "nss-util.h"
-#include "util.h"
-#include "in-addr-util.h"
-
-NSS_GETHOSTBYNAME_PROTOTYPES(resolve);
-NSS_GETHOSTBYADDR_PROTOTYPES(resolve);
-
-#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
-
-typedef void (*voidfunc_t)(void);
-
-static voidfunc_t find_fallback(const char *module, const char *symbol) {
- void *dl;
-
- /* Try to find a fallback NSS module symbol */
-
- dl = dlopen(module, RTLD_LAZY|RTLD_NODELETE);
- if (!dl)
- return NULL;
-
- return dlsym(dl, symbol);
-}
-
-static bool bus_error_shall_fallback(sd_bus_error *e) {
- return sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN) ||
- sd_bus_error_has_name(e, SD_BUS_ERROR_NAME_HAS_NO_OWNER) ||
- sd_bus_error_has_name(e, SD_BUS_ERROR_NO_REPLY) ||
- sd_bus_error_has_name(e, SD_BUS_ERROR_ACCESS_DENIED);
-}
-
-static int count_addresses(sd_bus_message *m, int af, const char **canonical) {
- int c = 0, r, ifindex;
-
- assert(m);
- assert(canonical);
-
- r = sd_bus_message_read(m, "i", &ifindex);
- if (r < 0)
- return r;
-
- r = sd_bus_message_enter_container(m, 'a', "(iay)");
- if (r < 0)
- return r;
-
- 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_exit_container(m);
- if (r < 0)
- return r;
-
- r = sd_bus_message_read(m, "s", canonical);
- if (r < 0)
- return r;
-
- r = sd_bus_message_rewind(m, true);
- if (r < 0)
- return r;
-
- return c;
-}
-
-enum nss_status _nss_resolve_gethostbyname4_r(
- const char *name,
- struct gaih_addrtuple **pat,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp) {
-
- _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- struct gaih_addrtuple *r_tuple, *r_tuple_first = NULL;
- _cleanup_bus_close_unref_ sd_bus *bus = NULL;
- const char *canonical = NULL;
- size_t l, ms, idx;
- char *r_name;
- int c, r, i = 0, ifindex;
-
- assert(name);
- assert(pat);
- assert(buffer);
- assert(errnop);
- assert(h_errnop);
-
- r = sd_bus_open_system(&bus);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_new_method_call(
- bus,
- &req,
- "org.freedesktop.resolve1",
- "/org/freedesktop/resolve1",
- "org.freedesktop.resolve1.Manager",
- "ResolveHostname");
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_set_auto_start(req, false);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_append(req, "isit", 0, name, AF_UNSPEC, (uint64_t) 0);
- if (r < 0)
- goto fail;
-
- r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
- if (r < 0) {
- if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- if (bus_error_shall_fallback(&error)) {
-
- enum nss_status (*fallback)(
- const char *name,
- struct gaih_addrtuple **pat,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp);
-
- fallback = (enum nss_status (*)(const char *name,
- struct gaih_addrtuple **pat,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp))
- find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyname4_r");
- if (fallback)
- return fallback(name, pat, buffer, buflen, errnop, h_errnop, ttlp);
- }
-
- *errnop = -r;
- *h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
- }
-
- c = count_addresses(reply, AF_UNSPEC, &canonical);
- if (c < 0) {
- r = c;
- goto fail;
- }
- if (c == 0) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- if (isempty(canonical))
- canonical = name;
-
- l = strlen(canonical);
- 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, canonical, l+1);
- idx = ALIGN(l+1);
-
- /* Second, append addresses */
- r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- goto fail;
-
- if (ifindex < 0) {
- r = -EINVAL;
- goto fail;
- }
-
- r = sd_bus_message_enter_container(reply, 'a', "(iay)");
- if (r < 0)
- goto fail;
-
- 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))
- continue;
-
- 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 = ifindex;
- memcpy(r_tuple->addr, a, sz);
-
- idx += ALIGN(sizeof(struct gaih_addrtuple));
- i++;
- }
- if (r < 0)
- goto fail;
-
- assert(i == c);
- 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_resolve_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 *req = NULL, *reply = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- char *r_name, *r_aliases, *r_addr, *r_addr_list;
- _cleanup_bus_close_unref_ sd_bus *bus = NULL;
- size_t l, idx, ms, alen;
- const char *canonical;
- int c, r, i = 0, ifindex;
-
- 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_bus_open_system(&bus);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_new_method_call(
- bus,
- &req,
- "org.freedesktop.resolve1",
- "/org/freedesktop/resolve1",
- "org.freedesktop.resolve1.Manager",
- "ResolveHostname");
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_set_auto_start(req, false);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_append(req, "isit", 0, name, af, (uint64_t) 0);
- if (r < 0)
- goto fail;
-
- r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
- if (r < 0) {
- if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- if (bus_error_shall_fallback(&error)) {
-
- enum nss_status (*fallback)(
- const char *name,
- int af,
- struct hostent *result,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp,
- char **canonp);
-
- fallback = (enum nss_status (*)(const char *name,
- int af,
- struct hostent *result,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp,
- char **canonp))
- find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyname3_r");
- if (fallback)
- return fallback(name, af, result, buffer, buflen, errnop, h_errnop, ttlp, canonp);
- }
-
- *errnop = -r;
- *h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
- }
-
- c = count_addresses(reply, af, &canonical);
- if (c < 0) {
- r = c;
- goto fail;
- }
- if (c == 0) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- if (isempty(canonical))
- canonical = name;
-
- alen = FAMILY_ADDRESS_SIZE(af);
- l = strlen(canonical);
-
- ms = ALIGN(l+1) + c * ALIGN(alen) + (c+2) * sizeof(char*);
-
- if (buflen < ms) {
- *errnop = ENOMEM;
- *h_errnop = TRY_AGAIN;
- return NSS_STATUS_TRYAGAIN;
- }
-
- /* First, append name */
- r_name = buffer;
- memcpy(r_name, canonical, l+1);
- idx = ALIGN(l+1);
-
- /* Second, create empty aliases array */
- r_aliases = buffer + idx;
- ((char**) r_aliases)[0] = NULL;
- idx += sizeof(char*);
-
- /* Third, append addresses */
- r_addr = buffer + idx;
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- goto fail;
-
- if (ifindex < 0) {
- r = -EINVAL;
- goto fail;
- }
-
- r = sd_bus_message_enter_container(reply, 'a', "(iay)");
- if (r < 0)
- goto fail;
-
- 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++;
- }
- if (r < 0)
- goto fail;
-
- assert(i == c);
- idx += c * ALIGN(alen);
-
- /* Fourth, 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;
-
- /* Explicitly reset all error variables */
- *errnop = 0;
- *h_errnop = NETDB_SUCCESS;
- h_errno = 0;
-
- if (ttlp)
- *ttlp = 0;
-
- if (canonp)
- *canonp = r_name;
-
- return NSS_STATUS_SUCCESS;
-
-fail:
- *errnop = -r;
- *h_errnop = NO_DATA;
- return NSS_STATUS_UNAVAIL;
-}
-
-enum nss_status _nss_resolve_gethostbyaddr2_r(
- const void* addr, socklen_t len,
- int af,
- struct hostent *result,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp) {
-
- _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- char *r_name, *r_aliases, *r_addr, *r_addr_list;
- _cleanup_bus_close_unref_ sd_bus *bus = NULL;
- unsigned c = 0, i = 0;
- size_t ms = 0, idx;
- const char *n;
- int r, ifindex;
-
- assert(addr);
- assert(result);
- assert(buffer);
- assert(errnop);
- assert(h_errnop);
-
- if (!IN_SET(af, AF_INET, AF_INET6)) {
- *errnop = EAFNOSUPPORT;
- *h_errnop = NO_DATA;
- return NSS_STATUS_UNAVAIL;
- }
-
- if (len != FAMILY_ADDRESS_SIZE(af)) {
- *errnop = EINVAL;
- *h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
- }
-
- r = sd_bus_open_system(&bus);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_new_method_call(
- bus,
- &req,
- "org.freedesktop.resolve1",
- "/org/freedesktop/resolve1",
- "org.freedesktop.resolve1.Manager",
- "ResolveAddress");
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_set_auto_start(req, false);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_append(req, "ii", 0, af);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_append_array(req, 'y', addr, len);
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_append(req, "t", (uint64_t) 0);
- if (r < 0)
- goto fail;
-
- r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
- if (r < 0) {
- if (sd_bus_error_has_name(&error, _BUS_ERROR_DNS "NXDOMAIN")) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- if (bus_error_shall_fallback(&error)) {
-
- enum nss_status (*fallback)(
- const void* addr, socklen_t len,
- int af,
- struct hostent *result,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp);
-
- fallback = (enum nss_status (*)(
- const void* addr, socklen_t len,
- int af,
- struct hostent *result,
- char *buffer, size_t buflen,
- int *errnop, int *h_errnop,
- int32_t *ttlp))
- find_fallback("libnss_dns.so.2", "_nss_dns_gethostbyaddr2_r");
-
- if (fallback)
- return fallback(addr, len, af, result, buffer, buflen, errnop, h_errnop, ttlp);
- }
-
- *errnop = -r;
- *h_errnop = NO_RECOVERY;
- return NSS_STATUS_UNAVAIL;
- }
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- goto fail;
-
- if (ifindex < 0) {
- r = -EINVAL;
- goto fail;
- }
-
- r = sd_bus_message_enter_container(reply, 'a', "s");
- if (r < 0)
- goto fail;
-
- while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
- c++;
- ms += ALIGN(strlen(n) + 1);
- }
- if (r < 0)
- goto fail;
-
- r = sd_bus_message_rewind(reply, false);
- if (r < 0)
- return r;
-
- if (c <= 0) {
- *errnop = ESRCH;
- *h_errnop = HOST_NOT_FOUND;
- return NSS_STATUS_NOTFOUND;
- }
-
- ms += ALIGN(len) + /* the address */
- 2 * sizeof(char*) + /* pointers to the address, plus trailing NULL */
- c * sizeof(char*); /* pointers to aliases, plus trailing NULL */
-
- if (buflen < ms) {
- *errnop = ENOMEM;
- *h_errnop = TRY_AGAIN;
- return NSS_STATUS_TRYAGAIN;
- }
-
- /* First, place address */
- r_addr = buffer;
- memcpy(r_addr, addr, len);
- idx = ALIGN(len);
-
- /* Second, place address list */
- r_addr_list = buffer + idx;
- ((char**) r_addr_list)[0] = r_addr;
- ((char**) r_addr_list)[1] = NULL;
- idx += sizeof(char*) * 2;
-
- /* Third, reserve space for the aliases array */
- r_aliases = buffer + idx;
- idx += sizeof(char*) * c;
-
- /* Fourth, place aliases */
- i = 0;
- r_name = buffer + idx;
- while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
- char *p;
- size_t l;
-
- l = strlen(n);
- p = buffer + idx;
- memcpy(p, n, l+1);
-
- if (i > 1)
- ((char**) r_aliases)[i-1] = p;
- i++;
-
- idx += ALIGN(l+1);
- }
- if (r < 0)
- goto fail;
-
- ((char**) r_aliases)[c-1] = NULL;
- assert(idx == ms);
-
- result->h_name = r_name;
- result->h_aliases = (char**) r_aliases;
- result->h_addrtype = af;
- result->h_length = len;
- result->h_addr_list = (char**) r_addr_list;
-
- if (ttlp)
- *ttlp = 0;
-
- /* 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(resolve);
-NSS_GETHOSTBYADDR_FALLBACKS(resolve);
~ianmdlvl / elogind.git / commitdiff