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src/confd: add support for /ietf-system:system/dns-resolver

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Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2023-04-03 19:31:34 +02:00
parent 42281378f8
commit 69920cb230
1 changed files with 98 additions and 0 deletions
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src/confd/src/ietf-system.c
+98
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@@ -560,6 +560,103 @@ static int change_ntp(sr_session_ctx_t *session, uint32_t sub_id, const char *mo
return SR_ERR_OK;
}
#define RESOLV_CONF "/etc/resolv.conf.head"
#define RESOLV_PREV RESOLV_CONF "-"
#define RESOLV_NEXT RESOLV_CONF "+"
static int change_dns(sr_session_ctx_t *session, uint32_t sub_id, const char *module,
const char *xpath, sr_event_t event, unsigned request_id, void *priv)
{
struct confd *confd = (struct confd *)priv;
const char *fn = RESOLV_NEXT;
int timeout, attempts;
int rc = SR_ERR_SYS;
int valid = -1;
sr_data_t *sdt;
sr_val_t *val;
size_t cnt;
FILE *fp;
switch (event) {
case SR_EV_ENABLED: /* first time, on register. */
case SR_EV_CHANGE: /* regular change (copy cand running) */
/* Generate next config */
break;
case SR_EV_ABORT: /* User abort, or other plugin failed */
remove(RESOLV_NEXT);
return SR_ERR_OK;
case SR_EV_DONE:
/* Check if passed validation in previous event */
if (access(RESOLV_NEXT, F_OK))
return SR_ERR_OK;
remove(RESOLV_PREV);
rename(RESOLV_CONF, RESOLV_PREV);
rename(RESOLV_NEXT, RESOLV_CONF);
/* in bootstrap, another resolvconf will soon take your call */
if (run("initctl cond get hook/sys/up"))
return 0;
run("resolvconf -u");
return SR_ERR_OK;
}
fp = fopen(fn, "w");
if (!fp) {
ERROR("failed updating %s: %s", fn, strerror(errno));
sr_free_values(val, cnt);
return SR_ERR_SYS;
}
timeout = sr_get_int(session, "/ietf-system:system/dns-resolver/options/timeout");
attempts = sr_get_int(session, "/ietf-system:system/dns-resolver/options/attempts");
if (timeout || attempts) {
fprintf(fp, "options");
if (timeout)
fprintf(fp, " timeout:%d", timeout);
if (attempts)
fprintf(fp, " attempts:%d ", attempts);
fprintf(fp, "\n");
}
if (rc = sr_get_items(session, "/ietf-system:system/dns-resolver/search", 0, 0, &val, &cnt))
goto fail;
if (cnt) {
fprintf(fp, "search ");
for (size_t i = 0; i < cnt; i++)
fprintf(fp, "%s ", val[i].data.string_val);
fprintf(fp, "\n");
}
sr_free_values(val, cnt);
if (rc = sr_get_items(session, "/ietf-system:system/dns-resolver/server", 0, 0, &val, &cnt))
goto fail;
for (size_t i = 0; i < cnt; i++) {
const char *xpath = val[i].xpath;
char *type, *ptr;
int server = 0;
/* Get /ietf-system:system/dns-resolver/server[name='foo'] */
ptr = sr_get_str(session, "%s/udp-and-tcp/address", xpath);
if (ptr)
fprintf(fp, "nameserver %s\n", ptr);
}
sr_free_values(val, cnt);
rc = SR_ERR_OK;
fail:
fclose(fp);
if (rc)
remove(fn);
return rc;
}
static int change_hostname(sr_session_ctx_t *session, uint32_t sub_id, const char *module,
const char *xpath, sr_event_t event, unsigned request_id, void *priv)
{
@@ -667,6 +764,7 @@ int ietf_system_init(struct confd *confd)
REGISTER_CHANGE(confd->session, "ietf-system", "/ietf-system:system/hostname", 0, change_hostname, confd, &confd->sub);
REGISTER_CHANGE(confd->session, "ietf-system", "/ietf-system:system/clock", 0, change_clock, confd, &confd->sub);
REGISTER_CHANGE(confd->session, "ietf-system", "/ietf-system:system/ntp", 0, change_ntp, confd, &confd->sub);
REGISTER_CHANGE(confd->session, "ietf-system", "/ietf-system:system/dns-resolver", 0, change_dns, confd, &confd->sub);
REGISTER_RPC(confd->session, "/ietf-system:system-restart", rpc_exec, "reboot", &confd->sub);
REGISTER_RPC(confd->session, "/ietf-system:system-shutdown", rpc_exec, "poweroff", &confd->sub);