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sd-network: add new API sd_network_link_get_dns_default_route()

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This simply reads from networkd's state files whether a link shall be
used as DNS default route.
This commit is contained in:
Lennart Poettering 2018-12-04 13:47:53 +01:00
parent 7ece6f5897
commit c629354e84
2 changed files with 22 additions and 0 deletions
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19
src/libsystemd/sd-network/sd-network.c
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@ -204,6 +204,25 @@ _public_ int sd_network_link_get_route_domains(int ifindex, char ***ret) {
return network_link_get_strv(ifindex, "ROUTE_DOMAINS", ret);
}
_public_ int sd_network_link_get_dns_default_route(int ifindex) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_free_ char *s = NULL;
int r;
assert_return(ifindex > 0, -EINVAL);
xsprintf(path, "/run/systemd/netif/links/%i", ifindex);
r = parse_env_file(NULL, path, "DNS_DEFAULT_ROUTE", &s);
if (r == -ENOENT)
return -ENODATA;
if (r < 0)
return r;
if (isempty(s))
return -ENODATA;
return parse_boolean(s);
}
static int network_link_get_ifindexes(int ifindex, const char *key, int **ret) {
char path[STRLEN("/run/systemd/netif/links/") + DECIMAL_STR_MAX(ifindex) + 1];
_cleanup_free_ int *ifis = NULL;

3
src/systemd/sd-network.h
View File

@ -151,6 +151,9 @@ int sd_network_link_get_search_domains(int ifindex, char ***domains);
/* Get the route DNS domain names for a given link. */
int sd_network_link_get_route_domains(int ifindex, char ***domains);
/* Get whether this link shall be used as 'default route' for DNS queries */
int sd_network_link_get_dns_default_route(int ifindex);
/* Get the carrier interface indexes to which current link is bound to. */
int sd_network_link_get_carrier_bound_to(int ifindex, int **ifindexes);