481 lines
17 KiB
C
481 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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log_debug("Copying DNS server information from %s", link->ifname);
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if (!link->network)
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return 0;
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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_ntp_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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char **a;
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if (!link->network)
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return 0;
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log_debug("Copying NTP server information from %s", link->ifname);
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STRV_FOREACH(a, link->network->ntp) {
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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 (link->network->dhcp_use_ntp && 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_ntp(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_ntp(s, addresses, n_addresses);
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}
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static int link_push_uplink_sip_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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char **a;
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if (!link->network)
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return 0;
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log_debug("Copying SIP server information from %s", link->ifname);
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STRV_FOREACH(a, link->network->sip) {
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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 (link->network->dhcp_use_sip && 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_sip(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_sip(s, 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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if (link->network->dhcp_server_emit_dns) {
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if (link->network->n_dhcp_server_dns > 0)
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r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
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else {
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uplink = manager_find_uplink(link->manager, link);
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acquired_uplink = true;
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if (!uplink) {
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log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
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r = 0;
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} else
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r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
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}
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if (r < 0)
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log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
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}
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if (link->network->dhcp_server_emit_ntp) {
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if (link->network->n_dhcp_server_ntp > 0)
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r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
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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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if (!uplink) {
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log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
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r = 0;
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} else
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r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
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}
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if (r < 0)
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log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
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}
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if (link->network->dhcp_server_emit_sip) {
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if (link->network->n_dhcp_server_sip > 0)
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r = sd_dhcp_server_set_sip(link->dhcp_server, link->network->dhcp_server_sip, link->network->n_dhcp_server_sip);
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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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if (!uplink) {
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log_link_debug(link, "Not emitting sip server information on link, couldn't find suitable uplink.");
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r = 0;
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} else
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r = link_push_uplink_sip_to_dhcp_server(uplink, link->dhcp_server);
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}
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if (r < 0)
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log_link_warning_errno(link, r, "Failed to set SIP server for DHCP server, ignoring: %m");
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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_error_errno(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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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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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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const char *p = rvalue;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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for (;;) {
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_cleanup_free_ char *w = NULL;
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union in_addr_union a;
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struct in_addr *m;
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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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break;
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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 DNS server address '%s', ignoring assignment: %m", w);
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continue;
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}
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m = reallocarray(n->dhcp_server_dns, n->n_dhcp_server_dns + 1, sizeof(struct in_addr));
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if (!m)
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return log_oom();
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m[n->n_dhcp_server_dns++] = a.in;
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n->dhcp_server_dns = m;
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}
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return 0;
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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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const char *p = rvalue;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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for (;;) {
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_cleanup_free_ char *w = NULL;
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union in_addr_union a;
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struct in_addr *m;
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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 NTP server address '%s', ignoring: %m", w);
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continue;
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}
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m = reallocarray(n->dhcp_server_ntp, n->n_dhcp_server_ntp + 1, sizeof(struct in_addr));
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if (!m)
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return log_oom();
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m[n->n_dhcp_server_ntp++] = a.in;
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n->dhcp_server_ntp = m;
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}
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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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const char *p = rvalue;
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int r;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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for (;;) {
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_cleanup_free_ char *w = NULL;
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union in_addr_union a;
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struct in_addr *m;
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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 SIP server address '%s', ignoring: %m", w);
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continue;
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}
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m = reallocarray(n->dhcp_server_sip, n->n_dhcp_server_sip + 1, sizeof(struct in_addr));
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if (!m)
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return log_oom();
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m[n->n_dhcp_server_sip++] = a.in;
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n->dhcp_server_sip = m;
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}
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}
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