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| char *
nmtst_dns_create_resolv_conf(const char *const *searches,
const char *const *nameservers,
const char *const *options)
{
return create_resolv_conf(searches, nameservers, options);
}
static gboolean
write_resolv_conf(FILE *f,
const char *const *searches,
const char *const *nameservers,
const char *const *options,
GError **error)
{
gs_free char *content = NULL;
content = create_resolv_conf(searches, nameservers, options);
return write_resolv_conf_contents(f, content, error);
}
static void
update_resolv_conf_no_stub(NMDnsManager *self,
const char *const *searches,
const char *const *nameservers,
const char *const *options)
{
gs_free char *content = NULL;
GError *local = NULL;
content = create_resolv_conf(searches, nameservers, options);
if (!g_file_set_contents(NO_STUB_RESOLV_CONF, content, -1, &local)) {
_LOGD("update-resolv-no-stub: failure to write file: %s", local->message);
g_error_free(local);
return;
}
_LOGT("update-resolv-no-stub: '%s' successfully written", NO_STUB_RESOLV_CONF);
}
static SpawnResult
update_resolv_conf(NMDnsManager *self,
const char *const *searches,
const char *const *nameservers,
const char *const *options,
GError **error,
NMDnsManagerResolvConfManager rc_manager)
{
FILE *f;
gboolean success;
gs_free char *content = NULL;
SpawnResult write_file_result = SR_SUCCESS;
int errsv;
gboolean resconf_link_cached = FALSE;
gs_free char *resconf_link = NULL;
content = create_resolv_conf(searches, nameservers, options);
if (rc_manager == NM_DNS_MANAGER_RESOLV_CONF_MAN_FILE
|| (rc_manager == NM_DNS_MANAGER_RESOLV_CONF_MAN_SYMLINK
&& !_read_link_cached(_PATH_RESCONF, &resconf_link_cached, &resconf_link))) {
gs_free char *rc_path_syml = NULL;
nm_auto_free char *rc_path_real = NULL;
const char *rc_path = _PATH_RESCONF;
GError *local = NULL;
if (rc_manager == NM_DNS_MANAGER_RESOLV_CONF_MAN_FILE) {
rc_path_real = realpath(_PATH_RESCONF, NULL);
if (rc_path_real)
rc_path = rc_path_real;
else {
rc_path_syml = nm_utils_read_link_absolute(_PATH_RESCONF, NULL);
if (rc_path_syml)
rc_path = rc_path_syml;
}
}
if (!g_file_set_contents(rc_path, content, -1, &local)) {
_LOGT("update-resolv-conf: write to %s failed (rc-manager=%s, %s)",
rc_path,
_rc_manager_to_string(rc_manager),
local->message);
g_propagate_error(error, local);
error = NULL;
write_file_result = SR_ERROR;
} else {
_LOGT("update-resolv-conf: write to %s succeeded (rc-manager=%s)",
rc_path,
_rc_manager_to_string(rc_manager));
}
}
if ((f = fopen(MY_RESOLV_CONF_TMP, "we")) == NULL) {
errsv = errno;
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not open %s: %s",
MY_RESOLV_CONF_TMP,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: open temporary file %s failed (%s)",
MY_RESOLV_CONF_TMP,
nm_strerror_native(errsv));
return SR_ERROR;
}
success = write_resolv_conf_contents(f, content, error);
if (!success) {
errsv = errno;
_LOGT("update-resolv-conf: write temporary file %s failed (%s)",
MY_RESOLV_CONF_TMP,
nm_strerror_native(errsv));
}
if (fclose(f) < 0) {
if (success) {
errsv = errno;
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not close %s: %s",
MY_RESOLV_CONF_TMP,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: close temporary file %s failed (%s)",
MY_RESOLV_CONF_TMP,
nm_strerror_native(errsv));
}
return SR_ERROR;
} else if (!success)
return SR_ERROR;
if (rename(MY_RESOLV_CONF_TMP, MY_RESOLV_CONF) < 0) {
errsv = errno;
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not replace %s: %s",
MY_RESOLV_CONF,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: failed to rename temporary file %s to %s (%s)",
MY_RESOLV_CONF_TMP,
MY_RESOLV_CONF,
nm_strerror_native(errsv));
return SR_ERROR;
}
if (rc_manager == NM_DNS_MANAGER_RESOLV_CONF_MAN_FILE) {
_LOGT("update-resolv-conf: write internal file %s succeeded (rc-manager=%s)",
MY_RESOLV_CONF,
_rc_manager_to_string(rc_manager));
return write_file_result;
}
if (rc_manager != NM_DNS_MANAGER_RESOLV_CONF_MAN_SYMLINK
|| !_read_link_cached(_PATH_RESCONF, &resconf_link_cached, &resconf_link)) {
_LOGT("update-resolv-conf: write internal file %s succeeded", MY_RESOLV_CONF);
return write_file_result;
}
if (!nm_streq0(_read_link_cached(_PATH_RESCONF, &resconf_link_cached, &resconf_link),
MY_RESOLV_CONF)) {
_LOGT("update-resolv-conf: write internal file %s succeeded (don't touch symlink %s "
"linking to %s)",
MY_RESOLV_CONF,
_PATH_RESCONF,
_read_link_cached(_PATH_RESCONF, &resconf_link_cached, &resconf_link));
return write_file_result;
}
if (unlink(RESOLV_CONF_TMP) != 0 && ((errsv = errno) != ENOENT)) {
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not unlink %s: %s",
RESOLV_CONF_TMP,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: write internal file %s succeeded "
"but cannot delete temporary file %s: %s",
MY_RESOLV_CONF,
RESOLV_CONF_TMP,
nm_strerror_native(errsv));
return SR_ERROR;
}
if (symlink(MY_RESOLV_CONF, RESOLV_CONF_TMP) == -1) {
errsv = errno;
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not create symlink %s pointing to %s: %s",
RESOLV_CONF_TMP,
MY_RESOLV_CONF,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: write internal file %s succeeded "
"but failed to symlink %s: %s",
MY_RESOLV_CONF,
RESOLV_CONF_TMP,
nm_strerror_native(errsv));
return SR_ERROR;
}
if (rename(RESOLV_CONF_TMP, _PATH_RESCONF) == -1) {
errsv = errno;
g_set_error(error,
NM_MANAGER_ERROR,
NM_MANAGER_ERROR_FAILED,
"Could not rename %s to %s: %s",
RESOLV_CONF_TMP,
_PATH_RESCONF,
nm_strerror_native(errsv));
_LOGT("update-resolv-conf: write internal file %s succeeded "
"but failed to rename temporary symlink %s to %s: %s",
MY_RESOLV_CONF,
RESOLV_CONF_TMP,
_PATH_RESCONF,
nm_strerror_native(errsv));
return SR_ERROR;
}
_LOGT("update-resolv-conf: write internal file %s succeeded and update symlink %s",
MY_RESOLV_CONF,
_PATH_RESCONF);
return write_file_result;
}
|
