libsystemd-dhcp: merge into libsystemd

1 files changed, 0 insertions, 1185 deletions

diff --git a/src/libsystemd-dhcp/dhcp-client.c b/src/libsystemd-dhcp/dhcp-client.c
deleted file mode 100644
index edfcb54a4c..0000000000
--- a/src/libsystemd-dhcp/dhcp-client.c
+++ /dev/null
@@ -1,1185 +0,0 @@
-/***
-  This file is part of systemd.
-
-  Copyright (C) 2013 Intel Corporation. All rights reserved.
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <stdlib.h>
-#include <errno.h>
-#include <string.h>
-#include <stdio.h>
-#include <net/ethernet.h>
-#include <sys/param.h>
-
-#include "util.h"
-#include "list.h"
-
-#include "dhcp-protocol.h"
-#include "dhcp-internal.h"
-#include "sd-dhcp-client.h"
-
-#define DHCP_CLIENT_MIN_OPTIONS_SIZE            312
-
-struct DHCPLease {
-        uint32_t t1;
-        uint32_t t2;
-        uint32_t lifetime;
-        be32_t address;
-        be32_t server_address;
-        be32_t subnet_mask;
-        be32_t router;
-        struct in_addr **dns;
-};
-
-typedef struct DHCPLease DHCPLease;
-
-struct sd_dhcp_client {
-        DHCPState state;
-        sd_event *event;
-        sd_event_source *timeout_resend;
-        int index;
-        int fd;
-        union sockaddr_union link;
-        sd_event_source *receive_message;
-        uint8_t *req_opts;
-        size_t req_opts_allocated;
-        size_t req_opts_size;
-        be32_t last_addr;
-        struct ether_addr mac_addr;
-        uint32_t xid;
-        usec_t start_time;
-        unsigned int attempt;
-        usec_t request_sent;
-        sd_event_source *timeout_t1;
-        sd_event_source *timeout_t2;
-        sd_event_source *timeout_expire;
-        sd_dhcp_client_cb_t cb;
-        void *userdata;
-        DHCPLease *lease;
-};
-
-static const uint8_t default_req_opts[] = {
-        DHCP_OPTION_SUBNET_MASK,
-        DHCP_OPTION_ROUTER,
-        DHCP_OPTION_HOST_NAME,
-        DHCP_OPTION_DOMAIN_NAME,
-        DHCP_OPTION_DOMAIN_NAME_SERVER,
-        DHCP_OPTION_NTP_SERVER,
-};
-
-static int client_receive_message(sd_event_source *s, int fd,
-                                  uint32_t revents, void *userdata);
-
-int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
-                                void *userdata)
-{
-        assert_return(client, -EINVAL);
-
-        client->cb = cb;
-        client->userdata = userdata;
-
-        return 0;
-}
-
-int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option)
-{
-        size_t i;
-
-        assert_return(client, -EINVAL);
-        assert_return (client->state == DHCP_STATE_INIT, -EBUSY);
-
-        switch(option) {
-        case DHCP_OPTION_PAD:
-        case DHCP_OPTION_OVERLOAD:
-        case DHCP_OPTION_MESSAGE_TYPE:
-        case DHCP_OPTION_PARAMETER_REQUEST_LIST:
-        case DHCP_OPTION_END:
-                return -EINVAL;
-
-        default:
-                break;
-        }
-
-        for (i = 0; i < client->req_opts_size; i++)
-                if (client->req_opts[i] == option)
-                        return -EEXIST;
-
-        if (!GREEDY_REALLOC(client->req_opts, client->req_opts_allocated,
-                            client->req_opts_size + 1))
-                return -ENOMEM;
-
-        client->req_opts[client->req_opts_size++] = option;
-
-        return 0;
-}
-
-int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
-                                       const struct in_addr *last_addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
-
-        if (last_addr)
-                client->last_addr = last_addr->s_addr;
-        else
-                client->last_addr = INADDR_ANY;
-
-        return 0;
-}
-
-int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
-{
-        assert_return(client, -EINVAL);
-        assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
-        assert_return(interface_index >= -1, -EINVAL);
-
-        client->index = interface_index;
-
-        return 0;
-}
-
-int sd_dhcp_client_set_mac(sd_dhcp_client *client,
-                           const struct ether_addr *addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
-
-        memcpy(&client->mac_addr, addr, ETH_ALEN);
-
-        return 0;
-}
-
-int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(addr, -EINVAL);
-
-        switch (client->state) {
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_REQUESTING:
-                return -EADDRNOTAVAIL;
-
-        case DHCP_STATE_BOUND:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-                addr->s_addr = client->lease->address;
-
-                break;
-        }
-
-        return 0;
-}
-
-int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(addr, -EINVAL);
-
-        switch (client->state) {
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_REQUESTING:
-                return -EADDRNOTAVAIL;
-
-        case DHCP_STATE_BOUND:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-                addr->s_addr = client->lease->subnet_mask;
-
-                break;
-        }
-
-        return 0;
-}
-
-int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr ***addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(addr, -EINVAL);
-
-        switch (client->state) {
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_REQUESTING:
-                return -EADDRNOTAVAIL;
-
-        case DHCP_STATE_BOUND:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-                if (client->lease->dns)
-                        *addr = client->lease->dns;
-                else
-                        return -ENOENT;
-
-                break;
-        }
-
-        return 0;
-}
-
-int sd_dhcp_client_prefixlen(const struct in_addr *addr)
-{
-        int len = 0;
-        uint32_t mask;
-
-        assert_return(addr, -EADDRNOTAVAIL);
-
-        mask = be32toh(addr->s_addr);
-        while (mask) {
-                len++;
-                mask = mask << 1;
-        }
-
-        return len;
-}
-
-int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
-{
-        assert_return(client, -EINVAL);
-        assert_return(addr, -EINVAL);
-
-        switch (client->state) {
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_REQUESTING:
-                return -EADDRNOTAVAIL;
-
-        case DHCP_STATE_BOUND:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-                addr->s_addr = client->lease->router;
-
-                break;
-        }
-
-        return 0;
-}
-
-static int client_notify(sd_dhcp_client *client, int event)
-{
-        if (client->cb)
-                client->cb(client, event, client->userdata);
-
-        return 0;
-}
-
-static void in_addrs_free(struct in_addr **addrs) {
-        unsigned i;
-
-        if (!addrs)
-                return;
-
-        for (i = 0; addrs[i]; i++)
-                free(addrs[i]);
-
-        free(addrs);
-}
-
-static int client_stop(sd_dhcp_client *client, int error)
-{
-        assert_return(client, -EINVAL);
-
-        client->receive_message =
-                sd_event_source_unref(client->receive_message);
-
-        if (client->fd >= 0)
-                close(client->fd);
-        client->fd = -1;
-
-        client->timeout_resend = sd_event_source_unref(client->timeout_resend);
-
-        client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
-        client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
-        client->timeout_expire = sd_event_source_unref(client->timeout_expire);
-
-        client->attempt = 1;
-
-        client_notify(client, error);
-
-        switch (client->state) {
-
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_REQUESTING:
-        case DHCP_STATE_BOUND:
-
-                client->start_time = 0;
-                client->state = DHCP_STATE_INIT;
-                break;
-
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-
-                break;
-        }
-
-        if (client->lease) {
-                in_addrs_free(client->lease->dns);
-                free(client->lease);
-                client->lease = NULL;
-        }
-
-        return 0;
-}
-
-static int client_packet_init(sd_dhcp_client *client, uint8_t type,
-                              DHCPMessage *message, uint16_t secs,
-                              uint8_t **opt, size_t *optlen)
-{
-        int err;
-        be16_t max_size;
-
-        *opt = (uint8_t *)(message + 1);
-
-        if (*optlen < 4)
-                return -ENOBUFS;
-        *optlen -= 4;
-
-        message->op = BOOTREQUEST;
-        message->htype = 1;
-        message->hlen = ETHER_ADDR_LEN;
-        message->xid = htobe32(client->xid);
-
-        /* Although 'secs' field is a SHOULD in RFC 2131, certain DHCP servers
-           refuse to issue an DHCP lease if 'secs' is set to zero */
-        message->secs = htobe16(secs);
-
-        if (client->state == DHCP_STATE_RENEWING ||
-            client->state == DHCP_STATE_REBINDING)
-                message->ciaddr = client->lease->address;
-
-        memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
-        (*opt)[0] = 0x63;
-        (*opt)[1] = 0x82;
-        (*opt)[2] = 0x53;
-        (*opt)[3] = 0x63;
-
-        *opt += 4;
-
-        err = dhcp_option_append(opt, optlen, DHCP_OPTION_MESSAGE_TYPE, 1,
-                                 &type);
-        if (err < 0)
-                return err;
-
-        /* Some DHCP servers will refuse to issue an DHCP lease if the Cliient
-           Identifier option is not set */
-        err = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
-                                 ETH_ALEN, &client->mac_addr);
-        if (err < 0)
-                return err;
-
-        if (type == DHCP_DISCOVER || type == DHCP_REQUEST) {
-                err = dhcp_option_append(opt, optlen,
-                                         DHCP_OPTION_PARAMETER_REQUEST_LIST,
-                                         client->req_opts_size,
-                                         client->req_opts);
-                if (err < 0)
-                        return err;
-
-                /* Some DHCP servers will send bigger DHCP packets than the
-                   defined default size unless the Maximum Messge Size option
-                   is explicitely set */
-                max_size = htobe16(DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE +
-                                   DHCP_CLIENT_MIN_OPTIONS_SIZE);
-                err = dhcp_option_append(opt, optlen,
-                                         DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
-                                         2, &max_size);
-                if (err < 0)
-                        return err;
-        }
-
-        return 0;
-}
-
-static uint16_t client_checksum(void *buf, int len)
-{
-        uint32_t sum;
-        uint16_t *check;
-        int i;
-        uint8_t *odd;
-
-        sum = 0;
-        check = buf;
-
-        for (i = 0; i < len / 2 ; i++)
-                sum += check[i];
-
-        if (len & 0x01) {
-                odd = buf;
-                sum += odd[len - 1];
-        }
-
-        while (sum >> 16)
-                sum = (sum & 0xffff) + (sum >> 16);
-
-        return ~sum;
-}
-
-static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
-{
-        packet->ip.version = IPVERSION;
-        packet->ip.ihl = DHCP_IP_SIZE / 4;
-        packet->ip.tot_len = htobe16(len);
-
-        packet->ip.protocol = IPPROTO_UDP;
-        packet->ip.saddr = INADDR_ANY;
-        packet->ip.daddr = INADDR_BROADCAST;
-
-        packet->udp.source = htobe16(DHCP_PORT_CLIENT);
-        packet->udp.dest = htobe16(DHCP_PORT_SERVER);
-        packet->udp.len = htobe16(len - DHCP_IP_SIZE);
-
-        packet->ip.check = packet->udp.len;
-        packet->udp.check = client_checksum(&packet->ip.ttl, len - 8);
-
-        packet->ip.ttl = IPDEFTTL;
-        packet->ip.check = 0;
-        packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
-}
-
-static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
-{
-        int err = 0;
-        _cleanup_free_ DHCPPacket *discover;
-        size_t optlen, len;
-        uint8_t *opt;
-
-        optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
-        len = sizeof(DHCPPacket) + optlen;
-
-        discover = malloc0(len);
-
-        if (!discover)
-                return -ENOMEM;
-
-        err = client_packet_init(client, DHCP_DISCOVER, &discover->dhcp,
-                                 secs, &opt, &optlen);
-        if (err < 0)
-                return err;
-
-        if (client->last_addr != INADDR_ANY) {
-                err = dhcp_option_append(&opt, &optlen,
-                                         DHCP_OPTION_REQUESTED_IP_ADDRESS,
-                                         4, &client->last_addr);
-                if (err < 0)
-                        return err;
-        }
-
-        err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
-        if (err < 0)
-                return err;
-
-        client_append_ip_headers(discover, len);
-
-        err = dhcp_network_send_raw_socket(client->fd, &client->link,
-                                           discover, len);
-
-        return err;
-}
-
-static int client_send_request(sd_dhcp_client *client, uint16_t secs)
-{
-        _cleanup_free_ DHCPPacket *request;
-        size_t optlen, len;
-        int err;
-        uint8_t *opt;
-
-        optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
-        len = DHCP_MESSAGE_SIZE + optlen;
-
-        request = malloc0(len);
-        if (!request)
-                return -ENOMEM;
-
-        err = client_packet_init(client, DHCP_REQUEST, &request->dhcp, secs,
-                                 &opt, &optlen);
-        if (err < 0)
-                return err;
-
-        if (client->state == DHCP_STATE_REQUESTING) {
-                err = dhcp_option_append(&opt, &optlen,
-                                         DHCP_OPTION_REQUESTED_IP_ADDRESS,
-                                         4, &client->lease->address);
-                if (err < 0)
-                        return err;
-
-                err = dhcp_option_append(&opt, &optlen,
-                                         DHCP_OPTION_SERVER_IDENTIFIER,
-                                         4, &client->lease->server_address);
-                if (err < 0)
-                        return err;
-        }
-
-        err = dhcp_option_append(&opt, &optlen, DHCP_OPTION_END, 0, NULL);
-        if (err < 0)
-                return err;
-
-        if (client->state == DHCP_STATE_RENEWING) {
-                err = dhcp_network_send_udp_socket(client->fd,
-                                                   client->lease->server_address,
-                                                   &request->dhcp,
-                                                   len - DHCP_IP_UDP_SIZE);
-        } else {
-                client_append_ip_headers(request, len);
-
-                err = dhcp_network_send_raw_socket(client->fd, &client->link,
-                                                   request, len);
-        }
-
-        return err;
-}
-
-static int client_timeout_resend(sd_event_source *s, uint64_t usec,
-                                 void *userdata)
-{
-        sd_dhcp_client *client = userdata;
-        usec_t next_timeout = 0;
-        uint32_t time_left;
-        uint16_t secs;
-        int err = 0;
-
-        switch (client->state) {
-        case DHCP_STATE_RENEWING:
-
-                time_left = (client->lease->t2 - client->lease->t1)/2;
-                if (time_left < 60)
-                        time_left = 60;
-
-                next_timeout = usec + time_left * USEC_PER_SEC;
-
-                break;
-
-        case DHCP_STATE_REBINDING:
-
-                time_left = (client->lease->lifetime - client->lease->t2)/2;
-                if (time_left < 60)
-                        time_left = 60;
-
-                next_timeout = usec + time_left * USEC_PER_SEC;
-                break;
-
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_SELECTING:
-        case DHCP_STATE_REQUESTING:
-        case DHCP_STATE_BOUND:
-
-                if (client->attempt < 64)
-                        client->attempt *= 2;
-
-                next_timeout = usec + (client->attempt - 1) * USEC_PER_SEC;
-
-                break;
-        }
-
-        next_timeout += (random_u32() & 0x1fffff);
-
-        err = sd_event_add_monotonic(client->event, next_timeout,
-                                     10 * USEC_PER_MSEC,
-                                     client_timeout_resend, client,
-                                     &client->timeout_resend);
-        if (err < 0)
-                goto error;
-
-        secs = (usec - client->start_time) / USEC_PER_SEC;
-
-        switch (client->state) {
-        case DHCP_STATE_INIT:
-                err = client_send_discover(client, secs);
-                if (err >= 0) {
-                        client->state = DHCP_STATE_SELECTING;
-                        client->attempt = 1;
-                } else {
-                        if (client->attempt >= 64)
-                                goto error;
-                }
-
-                break;
-
-        case DHCP_STATE_SELECTING:
-                err = client_send_discover(client, secs);
-                if (err < 0 && client->attempt >= 64)
-                        goto error;
-
-                break;
-
-        case DHCP_STATE_REQUESTING:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-                err = client_send_request(client, secs);
-                if (err < 0 && client->attempt >= 64)
-                         goto error;
-
-                client->request_sent = usec;
-
-                break;
-
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_BOUND:
-
-                break;
-        }
-
-        return 0;
-
-error:
-        client_stop(client, err);
-
-        /* Errors were dealt with when stopping the client, don't spill
-           errors into the event loop handler */
-        return 0;
-}
-
-static int client_initialize_events(sd_dhcp_client *client, usec_t usec)
-{
-        int r;
-
-        r = sd_event_add_io(client->event, client->fd, EPOLLIN,
-                            client_receive_message, client,
-                            &client->receive_message);
-        if (r < 0)
-                goto error;
-
-        r = sd_event_add_monotonic(client->event, usec, 0,
-                                   client_timeout_resend, client,
-                                   &client->timeout_resend);
-
-error:
-        if (r < 0)
-                client_stop(client, r);
-
-        return 0;
-
-}
-
-static int client_timeout_expire(sd_event_source *s, uint64_t usec,
-                                 void *userdata)
-{
-        sd_dhcp_client *client = userdata;
-
-        client_stop(client, DHCP_EVENT_EXPIRED);
-
-        return 0;
-}
-
-static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
-{
-        sd_dhcp_client *client = userdata;
-        int r;
-
-        if (client->fd >= 0) {
-                client->receive_message =
-                        sd_event_source_unref(client->receive_message);
-                close(client->fd);
-                client->fd = -1;
-        }
-
-        client->state = DHCP_STATE_REBINDING;
-        client->attempt = 1;
-
-        r = dhcp_network_bind_raw_socket(client->index, &client->link);
-        if (r < 0) {
-                client_stop(client, r);
-                return 0;
-        }
-
-        client->fd = r;
-
-        return client_initialize_events(client, usec);
-}
-
-static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata)
-{
-        sd_dhcp_client *client = userdata;
-        int r;
-
-        client->state = DHCP_STATE_RENEWING;
-        client->attempt = 1;
-
-        r = dhcp_network_bind_udp_socket(client->index,
-                                         client->lease->address);
-        if (r < 0) {
-                client_stop(client, r);
-                return 0;
-        }
-
-        client->fd = r;
-
-        return client_initialize_events(client, usec);
-}
-
-static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
-                              void *user_data)
-{
-        DHCPLease *lease = user_data;
-        be32_t val;
-
-        switch(code) {
-
-        case DHCP_OPTION_IP_ADDRESS_LEASE_TIME:
-                if (len == 4) {
-                        memcpy(&val, option, 4);
-                        lease->lifetime = be32toh(val);
-                }
-
-                break;
-
-        case DHCP_OPTION_SERVER_IDENTIFIER:
-                if (len >= 4)
-                        memcpy(&lease->server_address, option, 4);
-
-                break;
-
-        case DHCP_OPTION_SUBNET_MASK:
-                if (len >= 4)
-                        memcpy(&lease->subnet_mask, option, 4);
-
-                break;
-
-        case DHCP_OPTION_ROUTER:
-                if (len >= 4)
-                        memcpy(&lease->router, option, 4);
-
-                break;
-
-        case DHCP_OPTION_DOMAIN_NAME_SERVER:
-                if (len >= 4) {
-                        unsigned i;
-
-                        in_addrs_free(lease->dns);
-
-                        lease->dns = new0(struct in_addr*, len / 4 + 1);
-                        if (!lease->dns)
-                                return -ENOMEM;
-
-                        for (i = 0; i < len / 4; i++) {
-                                lease->dns[i] = new0(struct in_addr, 1);
-                                memcpy(&lease->dns[i]->s_addr, option + 4 * i, 4);
-                        }
-
-                        lease->dns[i + 1] = NULL;
-                }
-
-                break;
-
-        case DHCP_OPTION_RENEWAL_T1_TIME:
-                if (len == 4) {
-                        memcpy(&val, option, 4);
-                        lease->t1 = be32toh(val);
-                }
-
-                break;
-
-        case DHCP_OPTION_REBINDING_T2_TIME:
-                if (len == 4) {
-                        memcpy(&val, option, 4);
-                        lease->t2 = be32toh(val);
-                }
-
-                break;
-        }
-
-        return 0;
-}
-
-static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
-                                 size_t len)
-{
-        size_t hdrlen;
-
-        if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
-                return -EINVAL;
-
-        hdrlen = message->ip.ihl * 4;
-        if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
-                                                           hdrlen))
-                return -EINVAL;
-
-        message->ip.check = message->udp.len;
-        message->ip.ttl = 0;
-
-        if (hdrlen + be16toh(message->udp.len) > len ||
-            client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
-                return -EINVAL;
-
-        if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
-            be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
-                return -EINVAL;
-
-        if (message->dhcp.op != BOOTREPLY)
-                return -EINVAL;
-
-        if (be32toh(message->dhcp.xid) != client->xid)
-                return -EINVAL;
-
-        if (memcmp(&message->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
-                    ETHER_ADDR_LEN))
-                return -EINVAL;
-
-        return 0;
-}
-
-static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
-                                size_t len)
-{
-        int err;
-        DHCPLease *lease;
-
-        err = client_verify_headers(client, offer, len);
-        if (err < 0)
-                return err;
-
-        lease = new0(DHCPLease, 1);
-        if (!lease)
-                return -ENOMEM;
-
-        len = len - DHCP_IP_UDP_SIZE;
-        if (dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
-                              lease) != DHCP_OFFER)
-                goto error;
-
-        lease->address = offer->dhcp.yiaddr;
-
-        if (lease->address == INADDR_ANY ||
-            lease->server_address == INADDR_ANY ||
-            lease->subnet_mask == INADDR_ANY ||
-            lease->lifetime == 0)
-                goto error;
-
-        client->lease = lease;
-
-        return 0;
-
-error:
-        free(lease);
-
-        return -ENOMSG;
-}
-
-static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
-                              size_t len)
-{
-        int r;
-        DHCPPacket *ack;
-        DHCPMessage *dhcp;
-        DHCPLease *lease;
-
-        if (client->state == DHCP_STATE_RENEWING) {
-                dhcp = (DHCPMessage *)buf;
-        } else {
-                ack = (DHCPPacket *)buf;
-
-                r = client_verify_headers(client, ack, len);
-                if (r < 0)
-                        return r;
-
-                dhcp = &ack->dhcp;
-                len -= DHCP_IP_UDP_SIZE;
-        }
-
-        lease = new0(DHCPLease, 1);
-        if (!lease)
-                return -ENOMEM;
-
-        r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
-
-        if (r == DHCP_NAK) {
-                r = DHCP_EVENT_NO_LEASE;
-                goto error;
-        }
-
-        if (r != DHCP_ACK) {
-                r = -ENOMSG;
-                goto error;
-        }
-
-        lease->address = dhcp->yiaddr;
-
-        if (lease->address == INADDR_ANY ||
-            lease->server_address == INADDR_ANY ||
-            lease->subnet_mask == INADDR_ANY || lease->lifetime == 0) {
-                r = -ENOMSG;
-                goto error;
-        }
-
-        r = DHCP_EVENT_IP_ACQUIRE;
-        if (client->lease) {
-                if (client->lease->address != lease->address ||
-                    client->lease->subnet_mask != lease->subnet_mask ||
-                    client->lease->router != lease->router) {
-                        r = DHCP_EVENT_IP_CHANGE;
-                }
-
-                free(client->lease);
-        }
-
-        client->lease = lease;
-
-        return r;
-
-error:
-        free(lease);
-
-        return r;
-}
-
-static uint64_t client_compute_timeout(uint64_t request_sent,
-                                       uint32_t lifetime)
-{
-        return request_sent + (lifetime - 3) * USEC_PER_SEC +
-                + (random_u32() & 0x1fffff);
-}
-
-static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
-{
-        int err;
-        uint64_t next_timeout;
-
-        if (client->lease->lifetime < 10)
-                return -EINVAL;
-
-        client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
-        client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
-        client->timeout_expire = sd_event_source_unref(client->timeout_expire);
-
-        if (!client->lease->t1)
-                client->lease->t1 = client->lease->lifetime / 2;
-
-        next_timeout = client_compute_timeout(client->request_sent,
-                                              client->lease->t1);
-        if (next_timeout < usec)
-                return -EINVAL;
-
-        err = sd_event_add_monotonic(client->event, next_timeout,
-                                     10 * USEC_PER_MSEC,
-                                     client_timeout_t1, client,
-                                     &client->timeout_t1);
-        if (err < 0)
-                return err;
-
-        if (!client->lease->t2)
-                client->lease->t2 = client->lease->lifetime * 7 / 8;
-
-        if (client->lease->t2 < client->lease->t1)
-                return -EINVAL;
-
-        if (client->lease->lifetime < client->lease->t2)
-                return -EINVAL;
-
-        next_timeout = client_compute_timeout(client->request_sent,
-                                              client->lease->t2);
-        if (next_timeout < usec)
-                return -EINVAL;
-
-        err = sd_event_add_monotonic(client->event, next_timeout,
-                                     10 * USEC_PER_MSEC,
-                                     client_timeout_t2, client,
-                                     &client->timeout_t2);
-        if (err < 0)
-                return err;
-
-        next_timeout = client_compute_timeout(client->request_sent,
-                                              client->lease->lifetime);
-        if (next_timeout < usec)
-                return -EINVAL;
-
-        err = sd_event_add_monotonic(client->event, next_timeout,
-                                     10 * USEC_PER_MSEC,
-                                     client_timeout_expire, client,
-                                     &client->timeout_expire);
-        if (err < 0)
-                return err;
-
-        return 0;
-}
-
-static int client_receive_message(sd_event_source *s, int fd,
-                                  uint32_t revents, void *userdata)
-{
-        sd_dhcp_client *client = userdata;
-        uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
-        int buflen = sizeof(buf);
-        int len, r = 0, notify_event = 0;
-        DHCPPacket *message;
-        usec_t time_now;
-
-        len = read(fd, &buf, buflen);
-        if (len < 0)
-                return 0;
-
-        r = sd_event_get_now_monotonic(client->event, &time_now);
-        if (r < 0)
-                goto error;
-
-        switch (client->state) {
-        case DHCP_STATE_SELECTING:
-
-                message = (DHCPPacket *)&buf;
-
-                if (client_receive_offer(client, message, len) >= 0) {
-
-                        client->timeout_resend =
-                                sd_event_source_unref(client->timeout_resend);
-
-                        client->state = DHCP_STATE_REQUESTING;
-                        client->attempt = 1;
-
-                        r = sd_event_add_monotonic(client->event, time_now, 0,
-                                                   client_timeout_resend,
-                                                   client,
-                                                   &client->timeout_resend);
-                        if (r < 0)
-                                goto error;
-                }
-
-                break;
-
-        case DHCP_STATE_REQUESTING:
-        case DHCP_STATE_RENEWING:
-        case DHCP_STATE_REBINDING:
-
-                r = client_receive_ack(client, buf, len);
-
-                if (r == DHCP_EVENT_NO_LEASE)
-                        goto error;
-
-                if (r >= 0) {
-                        client->timeout_resend =
-                                sd_event_source_unref(client->timeout_resend);
-
-                        if (client->state == DHCP_STATE_REQUESTING)
-                                notify_event = DHCP_EVENT_IP_ACQUIRE;
-                        else if (r != DHCP_EVENT_IP_ACQUIRE)
-                                notify_event = r;
-
-                        client->state = DHCP_STATE_BOUND;
-                        client->attempt = 1;
-
-                        client->last_addr = client->lease->address;
-
-                        r = client_set_lease_timeouts(client, time_now);
-                        if (r < 0)
-                                goto error;
-
-                        if (notify_event)
-                                client_notify(client, notify_event);
-
-                        client->receive_message =
-                                sd_event_source_unref(client->receive_message);
-                        close(client->fd);
-                        client->fd = -1;
-                }
-
-                r = 0;
-
-                break;
-
-        case DHCP_STATE_INIT:
-        case DHCP_STATE_INIT_REBOOT:
-        case DHCP_STATE_REBOOTING:
-        case DHCP_STATE_BOUND:
-
-                break;
-        }
-
-error:
-        if (r < 0 || r == DHCP_EVENT_NO_LEASE)
-                return client_stop(client, r);
-
-        return 0;
-}
-
-int sd_dhcp_client_start(sd_dhcp_client *client)
-{
-        int r;
-
-        assert_return(client, -EINVAL);
-        assert_return(client->index > 0, -EINVAL);
-        assert_return(client->state == DHCP_STATE_INIT ||
-                      client->state == DHCP_STATE_INIT_REBOOT, -EBUSY);
-
-        client->xid = random_u32();
-
-        r = dhcp_network_bind_raw_socket(client->index, &client->link);
-
-        if (r < 0) {
-                client_stop(client, r);
-                return r;
-        }
-
-        client->fd = r;
-        client->start_time = now(CLOCK_MONOTONIC);
-
-        return client_initialize_events(client, client->start_time);
-}
-
-int sd_dhcp_client_stop(sd_dhcp_client *client)
-{
-        return client_stop(client, DHCP_EVENT_STOP);
-}
-
-sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client)
-{
-        assert_return(client, NULL);
-
-        sd_dhcp_client_stop(client);
-
-        sd_event_unref(client->event);
-        free(client->req_opts);
-        free(client);
-
-        return NULL;
-}
-
-sd_dhcp_client *sd_dhcp_client_new(sd_event *event)
-{
-        sd_dhcp_client *client;
-
-        assert_return(event, NULL);
-
-        client = new0(sd_dhcp_client, 1);
-        if (!client)
-                return NULL;
-
-        client->event = sd_event_ref(event);
-        client->state = DHCP_STATE_INIT;
-        client->index = -1;
-        client->fd = -1;
-        client->attempt = 1;
-
-        client->req_opts_size = ELEMENTSOF(default_req_opts);
-
-        client->req_opts = memdup(default_req_opts, client->req_opts_size);
-        if (!client->req_opts) {
-                free(client);
-                return NULL;
-        }
-
-        return client;
-}