457 lines
17 KiB
C
457 lines
17 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include "sd-dhcp-server.h"
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#include "networkd-dhcp-server.h"
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#include "networkd-link.h"
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#include "networkd-manager.h"
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#include "networkd-network.h"
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#include "parse-util.h"
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#include "strv.h"
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#include "string-table.h"
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#include "string-util.h"
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static Address* link_find_dhcp_server_address(Link *link) {
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Address *address;
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assert(link);
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assert(link->network);
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/* The first statically configured address if there is any */
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LIST_FOREACH(addresses, address, link->network->static_addresses) {
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if (address->family != AF_INET)
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continue;
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if (in_addr_is_null(address->family, &address->in_addr))
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continue;
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return address;
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}
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/* If that didn't work, find a suitable address we got from the pool */
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LIST_FOREACH(addresses, address, link->pool_addresses) {
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if (address->family != AF_INET)
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continue;
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return address;
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}
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return NULL;
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}
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static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
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_cleanup_free_ struct in_addr *addresses = NULL;
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size_t n_addresses = 0, n_allocated = 0;
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unsigned i;
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for (i = 0; i < link->network->n_dns; i++) {
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struct in_addr ia;
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/* Only look for IPv4 addresses */
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if (link->network->dns[i].family != AF_INET)
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continue;
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ia = link->network->dns[i].address.in;
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/* Never propagate obviously borked data */
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if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
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continue;
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if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
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return log_oom();
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addresses[n_addresses++] = ia;
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}
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if (link->network->dhcp_use_dns && link->dhcp_lease) {
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const struct in_addr *da = NULL;
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int j, n;
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n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
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if (n > 0) {
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if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
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return log_oom();
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for (j = 0; j < n; j++)
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if (in4_addr_is_non_local(&da[j]))
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addresses[n_addresses++] = da[j];
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}
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}
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if (n_addresses <= 0)
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return 0;
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return sd_dhcp_server_set_dns(s, addresses, n_addresses);
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}
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static int link_push_uplink_to_dhcp_server(
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Link *link,
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sd_dhcp_lease_info what,
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sd_dhcp_server *s) {
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_cleanup_free_ struct in_addr *addresses = NULL;
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size_t n_addresses = 0, n_allocated = 0;
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bool lease_condition;
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char **servers;
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if (!link->network)
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return 0;
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log_link_debug(link, "Copying %s from link", dhcp_lease_info_to_string(what));
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switch (what) {
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case SD_DHCP_LEASE_DNS_SERVERS:
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/* DNS servers are stored as parsed data, so special handling is required.
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* TODO: check if DNS servers should be stored unparsed too. */
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return link_push_uplink_dns_to_dhcp_server(link, s);
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case SD_DHCP_LEASE_NTP_SERVERS:
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servers = link->network->ntp;
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lease_condition = link->network->dhcp_use_ntp;
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break;
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case SD_DHCP_LEASE_POP3_SERVERS:
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servers = link->network->pop3;
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lease_condition = true;
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break;
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case SD_DHCP_LEASE_SMTP_SERVERS:
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servers = link->network->smtp;
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lease_condition = true;
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break;
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case SD_DHCP_LEASE_SIP_SERVERS:
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servers = link->network->sip;
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lease_condition = link->network->dhcp_use_sip;
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break;
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default:
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assert_not_reached("Unknown DHCP lease info item");
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}
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char **a;
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STRV_FOREACH(a, servers) {
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union in_addr_union ia;
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/* Only look for IPv4 addresses */
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if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
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continue;
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/* Never propagate obviously borked data */
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if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
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continue;
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if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
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return log_oom();
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addresses[n_addresses++] = ia.in;
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}
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if (lease_condition && link->dhcp_lease) {
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const struct in_addr *da;
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size_t n = sd_dhcp_lease_get_servers(link->dhcp_lease, what, &da);
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if (n > 0) {
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if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
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return log_oom();
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for (unsigned i = 0; i < n; i++)
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if (in4_addr_is_non_local(&da[i]))
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addresses[n_addresses++] = da[i];
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}
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}
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if (n_addresses <= 0)
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return 0;
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return sd_dhcp_server_set_servers(s, what, addresses, n_addresses);
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}
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int dhcp4_server_configure(Link *link) {
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bool acquired_uplink = false;
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sd_dhcp_option *p;
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Link *uplink = NULL;
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Address *address;
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Iterator i;
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int r;
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address = link_find_dhcp_server_address(link);
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if (!address)
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return log_link_error_errno(link, SYNTHETIC_ERRNO(EBUSY),
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"Failed to find suitable address for DHCPv4 server instance.");
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/* use the server address' subnet as the pool */
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r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
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link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to configure address pool for DHCPv4 server instance: %m");
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/* TODO:
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r = sd_dhcp_server_set_router(link->dhcp_server, &main_address->in_addr.in);
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if (r < 0)
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return r;
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*/
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if (link->network->dhcp_server_max_lease_time_usec > 0) {
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r = sd_dhcp_server_set_max_lease_time(link->dhcp_server,
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DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set maximum lease time for DHCPv4 server instance: %m");
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}
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if (link->network->dhcp_server_default_lease_time_usec > 0) {
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r = sd_dhcp_server_set_default_lease_time(link->dhcp_server,
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DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set default lease time for DHCPv4 server instance: %m");
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}
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const struct {
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bool condition;
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const struct in_addr *servers;
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unsigned n_servers;
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} configs[] = {
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[SD_DHCP_LEASE_DNS_SERVERS] = {
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link->network->dhcp_server_emit_dns,
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link->network->dhcp_server_dns,
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link->network->n_dhcp_server_dns,
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},
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[SD_DHCP_LEASE_NTP_SERVERS] = {
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link->network->dhcp_server_emit_ntp,
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link->network->dhcp_server_ntp,
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link->network->n_dhcp_server_ntp,
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},
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[SD_DHCP_LEASE_SIP_SERVERS] = {
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link->network->dhcp_server_emit_sip,
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link->network->dhcp_server_sip,
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link->network->n_dhcp_server_sip,
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},
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[SD_DHCP_LEASE_POP3_SERVERS] = {
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true,
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link->network->dhcp_server_pop3,
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link->network->n_dhcp_server_pop3,
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},
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[SD_DHCP_LEASE_SMTP_SERVERS] = {
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true,
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link->network->dhcp_server_smtp,
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link->network->n_dhcp_server_smtp,
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},
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};
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assert_cc(ELEMENTSOF(configs) == _SD_DHCP_LEASE_INFO_MAX);
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for (unsigned n = 0; n < ELEMENTSOF(configs); n++)
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if (configs[n].condition) {
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if (configs[n].n_servers > 0)
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r = sd_dhcp_server_set_servers(link->dhcp_server, n,
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configs[n].servers, configs[n].n_servers);
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else {
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if (!acquired_uplink) {
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uplink = manager_find_uplink(link->manager, link);
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acquired_uplink = true;
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}
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if (!uplink) {
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log_link_debug(link,
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"Not emitting %s on link, couldn't find suitable uplink.",
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dhcp_lease_info_to_string(n));
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r = 0;
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} else
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r = link_push_uplink_to_dhcp_server(uplink, n, link->dhcp_server);
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}
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if (r < 0)
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log_link_warning_errno(link, r,
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"Failed to set %s for DHCP server, ignoring: %m",
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dhcp_lease_info_to_string(n));
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}
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r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set router emission for DHCP server: %m");
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if (link->network->dhcp_server_emit_timezone) {
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_cleanup_free_ char *buffer = NULL;
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const char *tz;
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if (link->network->dhcp_server_timezone)
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tz = link->network->dhcp_server_timezone;
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else {
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r = get_timezone(&buffer);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to determine timezone: %m");
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tz = buffer;
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}
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r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set timezone for DHCP server: %m");
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}
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ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_options, i) {
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r = sd_dhcp_server_add_option(link->dhcp_server, p);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
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}
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ORDERED_HASHMAP_FOREACH(p, link->network->dhcp_server_send_vendor_options, i) {
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r = sd_dhcp_server_add_vendor_option(link->dhcp_server, p);
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if (r == -EEXIST)
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continue;
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if (r < 0)
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return log_link_error_errno(link, r, "Failed to set DHCPv4 option: %m");
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}
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if (!sd_dhcp_server_is_running(link->dhcp_server)) {
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r = sd_dhcp_server_start(link->dhcp_server);
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if (r < 0)
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return log_link_error_errno(link, r, "Could not start DHCPv4 server instance: %m");
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}
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return 0;
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}
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static int config_parse_dhcp_lease_server_list(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *lvalue,
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const char *rvalue,
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struct in_addr **addresses,
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unsigned *n_addresses) {
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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for (const char *p = rvalue;;) {
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_cleanup_free_ char *w = NULL;
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union in_addr_union a;
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int r;
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r = extract_first_word(&p, &w, NULL, 0);
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if (r == -ENOMEM)
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return log_oom();
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Failed to extract word, ignoring: %s", rvalue);
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return 0;
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}
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if (r == 0)
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return 0;
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r = in_addr_from_string(AF_INET, w, &a);
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if (r < 0) {
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log_syntax(unit, LOG_ERR, filename, line, r,
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"Failed to parse %s= address '%s', ignoring: %m", lvalue, w);
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continue;
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}
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struct in_addr *m = reallocarray(*addresses, *n_addresses + 1, sizeof(struct in_addr));
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if (!m)
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return log_oom();
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m[(*n_addresses)++] = a.in;
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*addresses = m;
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}
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}
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int config_parse_dhcp_server_dns(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *n = data;
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return config_parse_dhcp_lease_server_list(unit, filename, line,
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lvalue, rvalue,
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&n->dhcp_server_dns, &n->n_dhcp_server_dns);
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}
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int config_parse_dhcp_server_ntp(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *n = data;
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return config_parse_dhcp_lease_server_list(unit, filename, line,
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lvalue, rvalue,
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&n->dhcp_server_ntp, &n->n_dhcp_server_ntp);
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}
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int config_parse_dhcp_server_sip(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *n = data;
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return config_parse_dhcp_lease_server_list(unit, filename, line,
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lvalue, rvalue,
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&n->dhcp_server_sip, &n->n_dhcp_server_sip);
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}
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int config_parse_dhcp_server_pop3_servers(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *n = data;
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return config_parse_dhcp_lease_server_list(unit, filename, line,
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lvalue, rvalue,
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&n->dhcp_server_pop3, &n->n_dhcp_server_pop3);
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}
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int config_parse_dhcp_server_smtp_servers(
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const char *unit,
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) {
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Network *n = data;
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return config_parse_dhcp_lease_server_list(unit, filename, line,
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lvalue, rvalue,
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&n->dhcp_server_smtp, &n->n_dhcp_server_smtp);
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}
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