1 files changed, 157 insertions, 0 deletions
diff --git a/src/libsystemd/sd-network/network-util.c b/src/libsystemd/sd-network/network-util.c
new file mode 100644
index 0000000..2059567
--- /dev/null
+++ b/src/libsystemd/sd-network/network-util.c
@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "sd-network.h"
+
+#include "alloc-util.h"
+#include "network-util.h"
+#include "string-table.h"
+#include "strv.h"
+
+bool network_is_online(void) {
+        _cleanup_free_ char *online_state = NULL;
+        LinkOnlineState state;
+        int r;
+
+        r = sd_network_get_online_state(&online_state);
+        if (r < 0)
+                state = _LINK_ONLINE_STATE_INVALID;
+        else
+                state = link_online_state_from_string(online_state);
+
+        if (state >= LINK_ONLINE_STATE_PARTIAL)
+                return true;
+        else if (state < 0) {
+                _cleanup_free_ char *carrier_state = NULL, *addr_state = NULL;
+
+                r = sd_network_get_carrier_state(&carrier_state);
+                if (r < 0) /* if we don't know anything, we consider the system online */
+                        return true;
+
+                r = sd_network_get_address_state(&addr_state);
+                if (r < 0) /* if we don't know anything, we consider the system online */
+                        return true;
+
+                /* we don't know the online state for certain, so make an educated guess */
+                if (STR_IN_SET(carrier_state, "degraded-carrier", "carrier") &&
+                    STR_IN_SET(addr_state, "routable", "degraded"))
+                        return true;
+        }
+
+        return false;
+}
+
+static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
+        [LINK_OPERSTATE_MISSING]          = "missing",
+        [LINK_OPERSTATE_OFF]              = "off",
+        [LINK_OPERSTATE_NO_CARRIER]       = "no-carrier",
+        [LINK_OPERSTATE_DORMANT]          = "dormant",
+        [LINK_OPERSTATE_DEGRADED_CARRIER] = "degraded-carrier",
+        [LINK_OPERSTATE_CARRIER]          = "carrier",
+        [LINK_OPERSTATE_DEGRADED]         = "degraded",
+        [LINK_OPERSTATE_ENSLAVED]         = "enslaved",
+        [LINK_OPERSTATE_ROUTABLE]         = "routable",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
+
+static const char* const link_carrier_state_table[_LINK_CARRIER_STATE_MAX] = {
+        [LINK_CARRIER_STATE_OFF]              = "off",
+        [LINK_CARRIER_STATE_NO_CARRIER]       = "no-carrier",
+        [LINK_CARRIER_STATE_DORMANT]          = "dormant",
+        [LINK_CARRIER_STATE_DEGRADED_CARRIER] = "degraded-carrier",
+        [LINK_CARRIER_STATE_CARRIER]          = "carrier",
+        [LINK_CARRIER_STATE_ENSLAVED]         = "enslaved",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_carrier_state, LinkCarrierState);
+
+static const char* const link_required_address_family_table[_ADDRESS_FAMILY_MAX] = {
+        [ADDRESS_FAMILY_NO]   = "any",
+        [ADDRESS_FAMILY_IPV4] = "ipv4",
+        [ADDRESS_FAMILY_IPV6] = "ipv6",
+        [ADDRESS_FAMILY_YES]  = "both",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_required_address_family, AddressFamily);
+
+static const char* const link_address_state_table[_LINK_ADDRESS_STATE_MAX] = {
+        [LINK_ADDRESS_STATE_OFF]      = "off",
+        [LINK_ADDRESS_STATE_DEGRADED] = "degraded",
+        [LINK_ADDRESS_STATE_ROUTABLE] = "routable",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_address_state, LinkAddressState);
+
+static const char *const link_online_state_table[_LINK_ONLINE_STATE_MAX] = {
+        [LINK_ONLINE_STATE_OFFLINE] = "offline",
+        [LINK_ONLINE_STATE_PARTIAL] = "partial",
+        [LINK_ONLINE_STATE_ONLINE]  = "online",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(link_online_state, LinkOnlineState);
+
+int parse_operational_state_range(const char *str, LinkOperationalStateRange *out) {
+        LinkOperationalStateRange range = { _LINK_OPERSTATE_INVALID, _LINK_OPERSTATE_INVALID };
+        _cleanup_free_ const char *min = NULL;
+        const char *p;
+
+        assert(str);
+        assert(out);
+
+        p = strchr(str, ':');
+        if (p) {
+                min = strndup(str, p - str);
+
+                if (!isempty(p + 1)) {
+                        range.max = link_operstate_from_string(p + 1);
+                        if (range.max < 0)
+                                return -EINVAL;
+                }
+        } else
+                min = strdup(str);
+
+        if (!min)
+                return -ENOMEM;
+
+        if (!isempty(min)) {
+                range.min = link_operstate_from_string(min);
+                if (range.min < 0)
+                        return -EINVAL;
+        }
+
+        /* Fail on empty strings. */
+        if (range.min == _LINK_OPERSTATE_INVALID && range.max == _LINK_OPERSTATE_INVALID)
+                return -EINVAL;
+
+        if (range.min == _LINK_OPERSTATE_INVALID)
+                range.min = LINK_OPERSTATE_MISSING;
+        if (range.max == _LINK_OPERSTATE_INVALID)
+                range.max = LINK_OPERSTATE_ROUTABLE;
+
+        if (range.min > range.max)
+                return -EINVAL;
+
+        *out = range;
+
+        return 0;
+}
+
+int network_link_get_operational_state(int ifindex, LinkOperationalState *ret) {
+        _cleanup_free_ char *str = NULL;
+        LinkOperationalState s;
+        int r;
+
+        assert(ifindex > 0);
+        assert(ret);
+
+        r = sd_network_link_get_operational_state(ifindex, &str);
+        if (r < 0)
+                return r;
+
+        s = link_operstate_from_string(str);
+        if (s < 0)
+                return s;
+
+        *ret = s;
+        return 0;
+}