#include <net/if.h>
#include <stdlib.h>
#include <arpa/inet.h>
+#include <dlfcn.h>
#include "sd-bus.h"
#include "bus-util.h"
#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;
+ int c = 0, r, ifindex;
assert(m);
assert(canonical);
- r = sd_bus_message_enter_container(m, 'a', "(iayi)");
+ 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', "iayi")) > 0) {
+ 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, "ayi");
+ r = sd_bus_message_skip(m, "ay");
if (r < 0)
return r;
_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_unref_ sd_bus *bus = 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;
+ int c, r, i = 0, ifindex;
assert(name);
assert(pat);
if (r < 0)
goto fail;
- r = sd_bus_message_append(req, "sy", name, AF_UNSPEC);
+ r = sd_bus_message_append(req, "isit", 0, name, AF_UNSPEC, (uint64_t) 0);
if (r < 0)
goto fail;
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;
/* Second, append addresses */
r_tuple_first = (struct gaih_addrtuple*) (buffer + idx);
- r = sd_bus_message_enter_container(reply, 'a', "(iayi)");
+ r = sd_bus_message_read(reply, "i", &ifindex);
if (r < 0)
goto fail;
- while ((r = sd_bus_message_enter_container(reply, 'r', "iayi")) > 0) {
- int family, ifindex;
+ 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;
if (r < 0)
goto fail;
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- goto fail;
-
r = sd_bus_message_exit_container(reply);
if (r < 0)
goto fail;
goto fail;
}
- if (ifindex < 0) {
- 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;
if (ttlp)
*ttlp = 0;
+ /* Explicitly reset all error variables */
+ *errnop = 0;
+ *h_errnop = NETDB_SUCCESS;
+ h_errno = 0;
+
return NSS_STATUS_SUCCESS;
fail:
_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_unref_ sd_bus *bus = NULL;
+ _cleanup_bus_close_unref_ sd_bus *bus = NULL;
size_t l, idx, ms, alen;
const char *canonical;
- int c, r, i = 0;
+ int c, r, i = 0, ifindex;
assert(name);
assert(result);
if (r < 0)
goto fail;
- r = sd_bus_message_append(req, "sy", name, af);
+ r = sd_bus_message_append(req, "isit", 0, name, af, (uint64_t) 0);
if (r < 0)
goto fail;
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;
/* Third, append addresses */
r_addr = buffer + idx;
- r = sd_bus_message_enter_container(reply, 'a', "(iayi)");
+ 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', "iayi")) > 0) {
- int family, ifindex;
+ while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
+ int family;
const void *a;
size_t sz;
if (r < 0)
goto fail;
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- goto fail;
-
r = sd_bus_message_exit_container(reply);
if (r < 0)
goto fail;
goto fail;
}
- if (ifindex < 0) {
- r = -EINVAL;
- goto fail;
- }
-
memcpy(r_addr + i*ALIGN(alen), a, alen);
i++;
}
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;
_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_unref_ sd_bus *bus = NULL;
+ _cleanup_bus_close_unref_ sd_bus *bus = NULL;
unsigned c = 0, i = 0;
size_t ms = 0, idx;
const char *n;
- int r;
+ int r, ifindex;
assert(addr);
assert(result);
if (r < 0)
goto fail;
- r = sd_bus_message_append(req, "i", af);
+ r = sd_bus_message_append(req, "ii", 0, af);
if (r < 0)
goto fail;
if (r < 0)
goto fail;
- r = sd_bus_message_append(req, "i", 0);
+ r = sd_bus_message_append(req, "t", (uint64_t) 0);
if (r < 0)
goto fail;
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;
if (ttlp)
*ttlp = 0;
+ /* Explicitly reset all error variables */
+ *errnop = 0;
+ *h_errnop = NETDB_SUCCESS;
+ h_errno = 0;
+
return NSS_STATUS_SUCCESS;
fail:
~ianmdlvl / elogind.git / blobdiff