src/libsystemd/sd-network/network-util.c

/* 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;
}