src/systemd/sd-network.h

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 #ifndef foosdnetworkhfoo
   4 #define foosdnetworkhfoo
   5
   6 /***
   7   This file is part of systemd.
   8
   9   Copyright 2011 Lennart Poettering
  10   Copyright 2014 Tom Gundersen
  11
  12   systemd is free software; you can redistribute it and/or modify it
  13   under the terms of the GNU Lesser General Public License as published by
  14   the Free Software Foundation; either version 2.1 of the License, or
  15   (at your option) any later version.
  16
  17   systemd is distributed in the hope that it will be useful, but
  18   WITHOUT ANY WARRANTY; without even the implied warranty of
  19   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  20   Lesser General Public License for more details.
  21
  22   You should have received a copy of the GNU Lesser General Public License
  23   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  24 ***/
  25
  26 #include <inttypes.h>
  27 #include <sys/types.h>
  28
  29 #include "_sd-common.h"
  30
  31 /*
  32  * A few points:
  33  *
  34  * Instead of returning an empty string array or empty integer array, we
  35  * may return NULL.
  36  *
  37  * Free the data the library returns with libc free(). String arrays
  38  * are NULL terminated, and you need to free the array itself in
  39  * addition to the strings contained.
  40  *
  41  * We return error codes as negative errno, kernel-style. On success, we
  42  * return 0 or positive.
  43  *
  44  * These functions access data in /run. This is a virtual file system;
  45  * therefore, accesses are relatively cheap.
  46  *
  47  * See sd-network(3) for more information.
  48  */
  49
  50 _SD_BEGIN_DECLARATIONS;
  51
  52 /* Get overall operational state
  53  * Possible states: down, up, dormant, carrier, degraded, routable
  54  * Possible return codes:
  55  *   -ENODATA: networkd is not aware of any links
  56  */
  57 int sd_network_get_operational_state(char **state);
  58
  59 /* Get DNS entries for all links. These are string representations of
  60  * IP addresses */
  61 int sd_network_get_dns(char ***dns);
  62
  63 /* Get NTP entries for all links. These are domain names or string
  64  * representations of IP addresses */
  65 int sd_network_get_ntp(char ***ntp);
  66
  67 /* Get the search/routing domains for all links. */
  68 int sd_network_get_domains(char ***domains);
  69
  70 /* Get setup state from ifindex.
  71  * Possible states:
  72  *   pending: udev is still processing the link, we don't yet know if we will manage it
  73  *   failed: networkd failed to manage the link
  74  *   configuring: in the process of retrieving configuration or configuring the link
  75  *   configured: link configured successfully
  76  *   unmanaged: networkd is not handling the link
  77  *   linger: the link is gone, but has not yet been dropped by networkd
  78  * Possible return codes:
  79  *   -ENODATA: networkd is not aware of the link
  80  */
  81 int sd_network_link_get_setup_state(int ifindex, char **state);
  82
  83 /* Get operational state from ifindex.
  84  * Possible states:
  85  *   off: the device is powered down
  86  *   no-carrier: the device is powered up, but it does not yet have a carrier
  87  *   dormant: the device has a carrier, but is not yet ready for normal traffic
  88  *   carrier: the link has a carrier
  89  *   degraded: the link has carrier and addresses valid on the local link configured
  90  *   routable: the link has carrier and routable address configured
  91  * Possible return codes:
  92  *   -ENODATA: networkd is not aware of the link
  93  */
  94 int sd_network_link_get_operational_state(int ifindex, char **state);
  95
  96 /* Get path to .network file applied to link */
  97 int sd_network_link_get_network_file(int ifindex, char **filename);
  98
  99 /* Get DNS entries for a given link. These are string representations of
 100  * IP addresses */
 101 int sd_network_link_get_dns(int ifindex, char ***addr);
 102
 103 /* Get NTP entries for a given link. These are domain names or string
 104  * representations of IP addresses */
 105 int sd_network_link_get_ntp(int ifindex, char ***addr);
 106
 107 /* Indicates whether or not LLMNR should be enabled for the link
 108  * Possible levels of support: yes, no, resolve
 109  * Possible return codes:
 110  *   -ENODATA: networkd is not aware of the link
 111  */
 112 int sd_network_link_get_llmnr(int ifindex, char **llmnr);
 113
 114 /* Indicates whether or not MulticastDNS should be enabled for the
 115  * link.
 116  * Possible levels of support: yes, no, resolve
 117  * Possible return codes:
 118  *   -ENODATA: networkd is not aware of the link
 119  */
 120 int sd_network_link_get_mdns(int ifindex, char **mdns);
 121
 122 /* Indicates whether or not DNSSEC should be enabled for the link
 123  * Possible levels of support: yes, no, allow-downgrade
 124  * Possible return codes:
 125  *   -ENODATA: networkd is not aware of the link
 126  */
 127 int sd_network_link_get_dnssec(int ifindex, char **dnssec);
 128
 129 /* Returns the list of per-interface DNSSEC negative trust anchors
 130  * Possible return codes:
 131  *   -ENODATA: networkd is not aware of the link, or has no such data
 132  */
 133 int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta);
 134
 135 int sd_network_link_get_lldp(int ifindex, char **lldp);
 136
 137 /* Get the DNS domain names for a given link. */
 138 int sd_network_link_get_domains(int ifindex, char ***domains);
 139
 140 /* Get the CARRIERS to which current link is bound to. */
 141 int sd_network_link_get_carrier_bound_to(int ifindex, char ***carriers);
 142
 143 /* Get the CARRIERS that are bound to current link. */
 144 int sd_network_link_get_carrier_bound_by(int ifindex, char ***carriers);
 145
 146 /* Get the timezone that was learnt on a specific link. */
 147 int sd_network_link_get_timezone(int ifindex, char **timezone);
 148
 149 /* Returns whether or not domains that don't match any link should be resolved
 150  * on this link. 1 for yes, 0 for no and negative value for error */
 151 int sd_network_link_get_wildcard_domain(int ifindex);
 152
 153 /* Monitor object */
 154 typedef struct sd_network_monitor sd_network_monitor;
 155
 156 /* Create a new monitor. Category must be NULL, "links" or "leases". */
 157 int sd_network_monitor_new(sd_network_monitor **ret, const char *category);
 158
 159 /* Destroys the passed monitor. Returns NULL. */
 160 sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m);
 161
 162 /* Flushes the monitor */
 163 int sd_network_monitor_flush(sd_network_monitor *m);
 164
 165 /* Get FD from monitor */
 166 int sd_network_monitor_get_fd(sd_network_monitor *m);
 167
 168 /* Get poll() mask to monitor */
 169 int sd_network_monitor_get_events(sd_network_monitor *m);
 170
 171 /* Get timeout for poll(), as usec value relative to CLOCK_MONOTONIC's epoch */
 172 int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec);
 173
 174 _SD_DEFINE_POINTER_CLEANUP_FUNC(sd_network_monitor, sd_network_monitor_unref);
 175
 176 _SD_END_DECLARATIONS;
 177
 178 #endif