299d578f7f
1. DHCP server trasmit 2. Client parses and saves in leases Implements http://www.rfc-editor.org/rfc/rfc3361.txt ``` Frame 134: 348 bytes on wire (2784 bits), 348 bytes captured (2784 bits) on interface 0 Ethernet II, Src: 42:65:85:d6:4e:32 (42:65:85:d6:4e:32), Dst: 1e:04:f8:b8:2f:d4 (1e:04:f8:b8:2f:d4) Internet Protocol Version 4, Src: 192.168.5.1, Dst: 192.168.5.11 User Datagram Protocol, Src Port: 67, Dst Port: 68 Dynamic Host Configuration Protocol (ACK) Message type: Boot Reply (2) Hardware type: Ethernet (0x01) Hardware address length: 6 Hops: 0 Transaction ID: 0x7cc87cb4 Seconds elapsed: 0 Bootp flags: 0x0000 (Unicast) Client IP address: 0.0.0.0 Your (client) IP address: 192.168.5.11 Next server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0 Client MAC address: 1e:04:f8:b8:2f:d4 (1e:04:f8:b8:2f:d4) Client hardware address padding: 00000000000000000000 Server host name not given Boot file name not given Magic cookie: DHCP Option: (53) DHCP Message Type (ACK) Length: 1 DHCP: ACK (5) Option: (51) IP Address Lease Time Length: 4 IP Address Lease Time: (3600s) 1 hour Option: (1) Subnet Mask (255.255.255.0) Length: 4 Subnet Mask: 255.255.255.0 Option: (3) Router Length: 4 Router: 192.168.5.1 Option: (6) Domain Name Server Length: 4 Domain Name Server: 192.168.5.1 Option: (42) Network Time Protocol Servers Length: 4 Network Time Protocol Server: 192.168.1.1 Option: (120) SIP Servers <=====here Length: 9 SIP Server Encoding: IPv4 Address (1) SIP Server Address: 192.168.1.1 SIP Server Address: 192.168.5.2 Option: (101) TCode Length: 13 TZ TCode: Europe/Berlin Option: (54) DHCP Server Identifier (192.168.5.1) Length: 4 DHCP Server Identifier: 192.168.5.1 Option: (255) End Option End: 255 ``` ``` cat /run/systemd/netif/state ✔ ⚡ 3148 16:40:51 OPER_STATE=routable CARRIER_STATE=carrier ADDRESS_STATE=routable DNS=192.168.94.2 192.168.5.1 NTP=192.168.5.1 SIP=192.168.1.1 192.168.5.2 ``` aa
204 lines
7.4 KiB
C
204 lines
7.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#ifndef foosdnetworkhfoo
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#define foosdnetworkhfoo
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/***
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <inttypes.h>
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#include <sys/types.h>
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#include "_sd-common.h"
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/*
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* A few points:
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*
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* Instead of returning an empty string array or empty integer array, we
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* may return NULL.
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*
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* Free the data the library returns with libc free(). String arrays
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* are NULL terminated, and you need to free the array itself in
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* addition to the strings contained.
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*
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* We return error codes as negative errno, kernel-style. On success, we
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* return 0 or positive.
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*
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* These functions access data in /run. This is a virtual file system;
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* therefore, accesses are relatively cheap.
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*
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* See sd-network(3) for more information.
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*/
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_SD_BEGIN_DECLARATIONS;
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/* Get overall operational state
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* Possible states: down, up, dormant, carrier, degraded, routable
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* Possible return codes:
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* -ENODATA: networkd is not aware of any links
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*/
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int sd_network_get_operational_state(char **state);
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int sd_network_get_carrier_state(char **state);
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int sd_network_get_address_state(char **state);
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/* Get DNS entries for all links. These are string representations of
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* IP addresses */
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int sd_network_get_dns(char ***dns);
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/* Get NTP entries for all links. These are domain names or string
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* representations of IP addresses */
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int sd_network_get_ntp(char ***ntp);
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/* Get the search domains for all links. */
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int sd_network_get_search_domains(char ***domains);
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/* Get the search domains for all links. */
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int sd_network_get_route_domains(char ***domains);
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/* Get setup state from ifindex.
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* Possible states:
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* pending: udev is still processing the link, we don't yet know if we will manage it
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* failed: networkd failed to manage the link
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* configuring: in the process of retrieving configuration or configuring the link
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* configured: link configured successfully
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* unmanaged: networkd is not handling the link
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* linger: the link is gone, but has not yet been dropped by networkd
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_setup_state(int ifindex, char **state);
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/* Get operational state from ifindex.
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* Possible states:
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* off: the device is powered down
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* no-carrier: the device is powered up, but it does not yet have a carrier
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* dormant: the device has a carrier, but is not yet ready for normal traffic
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* carrier: the link has a carrier
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* degraded: the link has carrier and addresses valid on the local link configured
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* routable: the link has carrier and routable address configured
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_operational_state(int ifindex, char **state);
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int sd_network_link_get_required_operstate_for_online(int ifindex, char **state);
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int sd_network_link_get_carrier_state(int ifindex, char **state);
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int sd_network_link_get_address_state(int ifindex, char **state);
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/* Indicates whether the network is relevant to being online.
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* Possible return codes:
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* 0: the connection is not required
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* 1: the connection is required to consider the system online
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* <0: networkd is not aware of the link
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*/
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int sd_network_link_get_required_for_online(int ifindex);
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/* Get path to .network file applied to link */
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int sd_network_link_get_network_file(int ifindex, char **filename);
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/* Get DNS entries for a given link. These are string representations of
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* IP addresses */
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int sd_network_link_get_dns(int ifindex, char ***ret);
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/* Get DHCP4 address for a given link. This is string representations of
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* IPv4 address */
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int sd_network_link_get_dhcp4_address(int ifindex, char **ret);
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/* Get NTP entries for a given link. These are domain names or string
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* representations of IP addresses */
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int sd_network_link_get_ntp(int ifindex, char ***ret);
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/* Indicates whether or not LLMNR should be enabled for the link
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* Possible levels of support: yes, no, resolve
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_llmnr(int ifindex, char **llmnr);
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/* Indicates whether or not MulticastDNS should be enabled for the
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* link.
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* Possible levels of support: yes, no, resolve
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_mdns(int ifindex, char **mdns);
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/* Indicates whether or not DNS-over-TLS should be enabled for the
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* link.
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* Possible levels of support: yes, no, opportunistic
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_dns_over_tls(int ifindex, char **dns_over_tls);
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/* Indicates whether or not DNSSEC should be enabled for the link
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* Possible levels of support: yes, no, allow-downgrade
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link
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*/
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int sd_network_link_get_dnssec(int ifindex, char **dnssec);
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/* Returns the list of per-interface DNSSEC negative trust anchors
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* Possible return codes:
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* -ENODATA: networkd is not aware of the link, or has no such data
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*/
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int sd_network_link_get_dnssec_negative_trust_anchors(int ifindex, char ***nta);
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/* Get the search DNS domain names for a given link. */
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int sd_network_link_get_search_domains(int ifindex, char ***domains);
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/* Get the route DNS domain names for a given link. */
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int sd_network_link_get_route_domains(int ifindex, char ***domains);
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/* Get the sip servers for a given link. */
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int sd_network_link_get_sip_servers(int ifindex, char ***sip);
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/* Get whether this link shall be used as 'default route' for DNS queries */
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int sd_network_link_get_dns_default_route(int ifindex);
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/* Get the carrier interface indexes to which current link is bound to. */
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int sd_network_link_get_carrier_bound_to(int ifindex, int **ifindexes);
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/* Get the CARRIERS that are bound to current link. */
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int sd_network_link_get_carrier_bound_by(int ifindex, int **ifindexes);
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/* Get the timezone that was learnt on a specific link. */
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int sd_network_link_get_timezone(int ifindex, char **timezone);
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/* Monitor object */
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typedef struct sd_network_monitor sd_network_monitor;
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/* Create a new monitor. Category must be NULL, "links" or "leases". */
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int sd_network_monitor_new(sd_network_monitor **ret, const char *category);
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/* Destroys the passed monitor. Returns NULL. */
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sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m);
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/* Flushes the monitor */
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int sd_network_monitor_flush(sd_network_monitor *m);
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/* Get FD from monitor */
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int sd_network_monitor_get_fd(sd_network_monitor *m);
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/* Get poll() mask to monitor */
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int sd_network_monitor_get_events(sd_network_monitor *m);
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/* Get timeout for poll(), as usec value relative to CLOCK_MONOTONIC's epoch */
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int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec);
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_SD_DEFINE_POINTER_CLEANUP_FUNC(sd_network_monitor, sd_network_monitor_unref);
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_SD_END_DECLARATIONS;
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#endif
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