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networkd: add bus property exposing network namepace ID we run in

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This is useful for clients to determine whether they are running in the
same network namespace as networkd.

Note that access to /proc/$PID/ns/ is restricted and only permitted to
equally privileged programs. This new bus property is primarily a way to
work around this, so that unprivileged clients can determine the
networkd netns, too.
This commit is contained in:
Lennart Poettering 2021-05-26 10:37:18 +02:00
parent bb635f3706
commit f2ef8b28a5
1 changed files with 29 additions and 0 deletions
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29
src/network/networkd-manager-bus.c
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@ -263,6 +263,34 @@ static int bus_method_describe(sd_bus_message *message, void *userdata, sd_bus_e
return sd_bus_send(NULL, reply, NULL);
}
static int property_get_namespace_id(
sd_bus *bus,
const char *path,
const char *interface,
const char *property,
sd_bus_message *reply,
void *userdata,
sd_bus_error *error) {
uint64_t id = 0;
struct stat st;
assert(bus);
assert(reply);
/* Returns our own network namespace ID, i.e. the inode number of /proc/self/ns/net. This allows
* unprivileged clients to determine whether they are in the same network namespace as us (note that
* access to that path is restricted, thus they can't check directly unless privileged). */
if (stat("/proc/self/ns/net", &st) < 0) {
log_warning_errno(errno, "Failed to stat network namespace, ignoring: %m");
id = 0;
} else
id = st.st_ino;
return sd_bus_message_append(reply, "t", id);
}
const sd_bus_vtable manager_vtable[] = {
SD_BUS_VTABLE_START(0),
@ -272,6 +300,7 @@ const sd_bus_vtable manager_vtable[] = {
SD_BUS_PROPERTY("IPv4AddressState", "s", property_get_address_state, offsetof(Manager, ipv4_address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("IPv6AddressState", "s", property_get_address_state, offsetof(Manager, ipv6_address_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("OnlineState", "s", property_get_online_state, offsetof(Manager, online_state), SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
SD_BUS_PROPERTY("NamespaceId", "t", property_get_namespace_id, 0, SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_METHOD_WITH_ARGS("ListLinks",
SD_BUS_NO_ARGS,