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

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include "sd-id128.h"
   4
   5 #include "alloc-util.h"
   6 #include "arphrd-list.h"
   7 #include "device-util.h"
   8 #include "fd-util.h"
   9 #include "network-util.h"
  10 #include "siphash24.h"
  11 #include "sparse-endian.h"
  12 #include "string-table.h"
  13 #include "strv.h"
  14
  15 bool network_is_online(void) {
  16         _cleanup_free_ char *carrier_state = NULL, *addr_state = NULL;
  17         int r;
  18
  19         r = sd_network_get_carrier_state(&carrier_state);
  20         if (r < 0) /* if we don't know anything, we consider the system online */
  21                 return true;
  22
  23         r = sd_network_get_address_state(&addr_state);
  24         if (r < 0) /* if we don't know anything, we consider the system online */
  25                 return true;
  26
  27         if (STR_IN_SET(carrier_state, "degraded-carrier", "carrier") &&
  28             STR_IN_SET(addr_state, "routable", "degraded"))
  29                 return true;
  30
  31         return false;
  32 }
  33
  34 static const char* const link_operstate_table[_LINK_OPERSTATE_MAX] = {
  35         [LINK_OPERSTATE_MISSING]          = "missing",
  36         [LINK_OPERSTATE_OFF]              = "off",
  37         [LINK_OPERSTATE_NO_CARRIER]       = "no-carrier",
  38         [LINK_OPERSTATE_DORMANT]          = "dormant",
  39         [LINK_OPERSTATE_DEGRADED_CARRIER] = "degraded-carrier",
  40         [LINK_OPERSTATE_CARRIER]          = "carrier",
  41         [LINK_OPERSTATE_DEGRADED]         = "degraded",
  42         [LINK_OPERSTATE_ENSLAVED]         = "enslaved",
  43         [LINK_OPERSTATE_ROUTABLE]         = "routable",
  44 };
  45
  46 DEFINE_STRING_TABLE_LOOKUP(link_operstate, LinkOperationalState);
  47
  48 static const char* const link_carrier_state_table[_LINK_CARRIER_STATE_MAX] = {
  49         [LINK_CARRIER_STATE_OFF]              = "off",
  50         [LINK_CARRIER_STATE_NO_CARRIER]       = "no-carrier",
  51         [LINK_CARRIER_STATE_DORMANT]          = "dormant",
  52         [LINK_CARRIER_STATE_DEGRADED_CARRIER] = "degraded-carrier",
  53         [LINK_CARRIER_STATE_CARRIER]          = "carrier",
  54         [LINK_CARRIER_STATE_ENSLAVED]         = "enslaved",
  55 };
  56
  57 DEFINE_STRING_TABLE_LOOKUP(link_carrier_state, LinkCarrierState);
  58
  59 static const char* const link_address_state_table[_LINK_ADDRESS_STATE_MAX] = {
  60         [LINK_ADDRESS_STATE_OFF]      = "off",
  61         [LINK_ADDRESS_STATE_DEGRADED] = "degraded",
  62         [LINK_ADDRESS_STATE_ROUTABLE] = "routable",
  63 };
  64
  65 DEFINE_STRING_TABLE_LOOKUP(link_address_state, LinkAddressState);
  66
  67 int parse_operational_state_range(const char *str, LinkOperationalStateRange *out) {
  68         LinkOperationalStateRange range = { _LINK_OPERSTATE_INVALID, _LINK_OPERSTATE_INVALID };
  69         _cleanup_free_ const char *min = NULL;
  70         const char *p;
  71
  72         assert(str);
  73         assert(out);
  74
  75         p = strchr(str, ':');
  76         if (p) {
  77                 min = strndup(str, p - str);
  78
  79                 if (!isempty(p + 1)) {
  80                         range.max = link_operstate_from_string(p + 1);
  81                         if (range.max < 0)
  82                                 return -EINVAL;
  83                 }
  84         } else
  85                 min = strdup(str);
  86
  87         if (!min)
  88                 return -ENOMEM;
  89
  90         if (!isempty(min)) {
  91                 range.min = link_operstate_from_string(min);
  92                 if (range.min < 0)
  93                         return -EINVAL;
  94         }
  95
  96         /* Fail on empty strings. */
  97         if (range.min == _LINK_OPERSTATE_INVALID && range.max == _LINK_OPERSTATE_INVALID)
  98                 return -EINVAL;
  99
 100         if (range.min == _LINK_OPERSTATE_INVALID)
 101                 range.min = LINK_OPERSTATE_MISSING;
 102         if (range.max == _LINK_OPERSTATE_INVALID)
 103                 range.max = LINK_OPERSTATE_ROUTABLE;
 104
 105         if (range.min > range.max)
 106                 return -EINVAL;
 107
 108         *out = range;
 109
 110         return 0;
 111 }
 112
 113 char *link_get_type_string(sd_device *device, unsigned short iftype) {
 114         const char *t;
 115         char *p;
 116
 117         if (device &&
 118             sd_device_get_devtype(device, &t) >= 0 &&
 119             !isempty(t))
 120                 return strdup(t);
 121
 122         t = arphrd_to_name(iftype);
 123         if (!t)
 124                 return NULL;
 125
 126         p = strdup(t);
 127         if (!p)
 128                 return NULL;
 129
 130         return ascii_strlower(p);
 131 }
 132
 133 const char *net_get_name_persistent(sd_device *device) {
 134         const char *name, *field;
 135
 136         assert(device);
 137
 138         /* fetch some persistent data unique (on this machine) to this device */
 139         FOREACH_STRING(field, "ID_NET_NAME_ONBOARD", "ID_NET_NAME_SLOT", "ID_NET_NAME_PATH", "ID_NET_NAME_MAC")
 140                 if (sd_device_get_property_value(device, field, &name) >= 0)
 141                         return name;
 142
 143         return NULL;
 144 }
 145
 146 #define HASH_KEY SD_ID128_MAKE(d3,1e,48,fa,90,fe,4b,4c,9d,af,d5,d7,a1,b1,2e,8a)
 147
 148 int net_get_unique_predictable_data(sd_device *device, bool use_sysname, uint64_t *result) {
 149         size_t l, sz = 0;
 150         const char *name;
 151         int r;
 152         uint8_t *v;
 153
 154         assert(device);
 155
 156         /* net_get_name_persistent() will return one of the device names based on stable information about
 157          * the device. If this is not available, we fall back to using the actual device name. */
 158         name = net_get_name_persistent(device);
 159         if (!name && use_sysname)
 160                 (void) sd_device_get_sysname(device, &name);
 161         if (!name)
 162                 return log_device_debug_errno(device, SYNTHETIC_ERRNO(ENODATA),
 163                                               "No stable identifying information found");
 164
 165         log_device_debug(device, "Using \"%s\" as stable identifying information", name);
 166         l = strlen(name);
 167         sz = sizeof(sd_id128_t) + l;
 168         v = newa(uint8_t, sz);
 169
 170         /* Fetch some persistent data unique to this machine */
 171         r = sd_id128_get_machine((sd_id128_t*) v);
 172         if (r < 0)
 173                  return r;
 174         memcpy(v + sizeof(sd_id128_t), name, l);
 175
 176         /* Let's hash the machine ID plus the device name. We use
 177          * a fixed, but originally randomly created hash key here. */
 178         *result = htole64(siphash24(v, sz, HASH_KEY.bytes));
 179         return 0;
 180 }