#include <stdio.h>
#include <net/ethernet.h>
#include <sys/param.h>
+#include <sys/ioctl.h>
#include "util.h"
#include "list.h"
#include "dhcp-protocol.h"
+#include "dhcp-lease.h"
#include "dhcp-internal.h"
#include "sd-dhcp-client.h"
-#define DHCP_CLIENT_MIN_OPTIONS_SIZE 312
-
-#define client_state_machine_check(s, r) \
- do { \
- if (s != DHCP_STATE_BOUND && \
- s != DHCP_STATE_RENEWING && \
- s != DHCP_STATE_REBINDING) { \
- return (r); \
- } \
- } while (false)
-
-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;
- size_t dns_size;
- uint16_t mtu;
- char *domainname;
- char *hostname;
-};
-
-typedef struct DHCPLease DHCPLease;
-
struct sd_dhcp_client {
DHCPState state;
sd_event *event;
sd_event_source *timeout_expire;
sd_dhcp_client_cb_t cb;
void *userdata;
- DHCPLease *lease;
+ sd_dhcp_lease *lease;
};
static const uint8_t default_req_opts[] = {
DHCP_OPTION_NTP_SERVER,
};
-static int client_receive_message(sd_event_source *s, int fd,
- uint32_t revents, void *userdata);
+static int client_receive_message_raw(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata);
+static int client_receive_message_udp(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) {
return 0;
}
-int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr) {
- assert_return(client, -EINVAL);
- assert_return(addr, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- addr->s_addr = client->lease->address;
-
- return 0;
-}
-
-int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu) {
- assert_return(client, -EINVAL);
- assert_return(mtu, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- if (client->lease->mtu)
- *mtu = client->lease->mtu;
- else
- return -ENOENT;
-
- return 0;
-}
-
-int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t *addr_size) {
- assert_return(client, -EINVAL);
- assert_return(addr, -EINVAL);
- assert_return(addr_size, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- if (client->lease->dns_size) {
- *addr_size = client->lease->dns_size;
- *addr = client->lease->dns;
- } else
- return -ENOENT;
-
- return 0;
-}
-
-int sd_dhcp_client_get_domainname(sd_dhcp_client *client, const char **domainname) {
+int sd_dhcp_client_get_lease(sd_dhcp_client *client, sd_dhcp_lease **ret) {
assert_return(client, -EINVAL);
- assert_return(domainname, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- if (client->lease->domainname)
- *domainname = client->lease->domainname;
- else
- return -ENOENT;
-
- return 0;
-}
-
-int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname) {
- assert_return(client, -EINVAL);
- assert_return(hostname, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- if (client->lease->hostname)
- *hostname = client->lease->hostname;
- else
- return -ENOENT;
-
- return 0;
-}
-
-int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
- assert_return(client, -EINVAL);
- assert_return(addr, -EINVAL);
-
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
-
- addr->s_addr = client->lease->router;
-
- return 0;
-}
-
-int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
- assert_return(client, -EINVAL);
- assert_return(addr, -EINVAL);
+ assert_return(ret, -EINVAL);
- client_state_machine_check (client->state, -EADDRNOTAVAIL);
+ if (client->state != DHCP_STATE_BOUND &&
+ client->state != DHCP_STATE_RENEWING &&
+ client->state != DHCP_STATE_REBINDING)
+ return -EADDRNOTAVAIL;
- addr->s_addr = client->lease->subnet_mask;
+ *ret = sd_dhcp_lease_ref(client->lease);
return 0;
}
return 0;
}
-static void lease_free(DHCPLease *lease) {
- if (!lease)
- return;
-
- free(lease->hostname);
- free(lease->domainname);
- free(lease->dns);
- free(lease);
-}
-
-DEFINE_TRIVIAL_CLEANUP_FUNC(DHCPLease*, lease_free);
-#define _cleanup_lease_free_ _cleanup_(lease_freep)
-
static int client_stop(sd_dhcp_client *client, int error) {
assert_return(client, -EINVAL);
client->secs = 0;
client->state = DHCP_STATE_INIT;
- if (client->lease) {
- lease_free(client->lease);
- client->lease = NULL;
- }
+ if (client->lease)
+ client->lease = sd_dhcp_lease_unref(client->lease);
+
+ log_dhcp_client(client, "STOPPED");
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);
+static int client_message_init(sd_dhcp_client *client, DHCPMessage *message,
+ uint8_t type, uint16_t secs, uint8_t **opt,
+ size_t *optlen) {
+ int r;
- if (*optlen < 4)
- return -ENOBUFS;
- *optlen -= 4;
+ assert(secs);
- message->op = BOOTREQUEST;
- message->htype = 1;
- message->hlen = ETHER_ADDR_LEN;
- message->xid = htobe32(client->xid);
+ r = dhcp_message_init(message, BOOTREQUEST, client->xid, type, opt,
+ optlen);
+ if (r < 0)
+ return r;
/* 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);
+ memcpy(&message->chaddr, &client->mac_addr, ETH_ALEN);
+
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
+ /* Some DHCP servers will refuse to issue an DHCP lease if the Client
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;
+ r = dhcp_option_append(opt, optlen, DHCP_OPTION_CLIENT_IDENTIFIER,
+ ETH_ALEN, &client->mac_addr);
+ if (r < 0)
+ return r;
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;
+ be16_t max_size;
+
+ r = dhcp_option_append(opt, optlen,
+ DHCP_OPTION_PARAMETER_REQUEST_LIST,
+ client->req_opts_size,
+ client->req_opts);
+ if (r < 0)
+ return r;
/* 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;
+ DHCP_MIN_OPTIONS_SIZE);
+ r = dhcp_option_append(opt, optlen,
+ DHCP_OPTION_MAXIMUM_MESSAGE_SIZE,
+ 2, &max_size);
+ if (r < 0)
+ return r;
}
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;
+ optlen = DHCP_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);
+ err = client_message_init(client, &discover->dhcp, DHCP_DISCOVER,
+ secs, &opt, &optlen);
if (err < 0)
return err;
if (err < 0)
return err;
- client_append_ip_headers(discover, len);
+ dhcp_packet_append_ip_headers(discover, len);
err = dhcp_network_send_raw_socket(client->fd, &client->link,
discover, len);
+ log_dhcp_client(client, "DISCOVER");
+
return err;
}
int err;
uint8_t *opt;
- optlen = DHCP_CLIENT_MIN_OPTIONS_SIZE;
+ optlen = DHCP_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);
+ err = client_message_init(client, &request->dhcp, DHCP_REQUEST, secs,
+ &opt, &optlen);
if (err < 0)
return err;
if (client->state == DHCP_STATE_RENEWING) {
err = dhcp_network_send_udp_socket(client->fd,
client->lease->server_address,
+ DHCP_PORT_SERVER,
&request->dhcp,
len - DHCP_IP_UDP_SIZE);
} else {
- client_append_ip_headers(request, len);
+ dhcp_packet_append_ip_headers(request, len);
err = dhcp_network_send_raw_socket(client->fd, &client->link,
request, len);
}
+ log_dhcp_client(client, "REQUEST");
+
return err;
}
static uint16_t client_update_secs(sd_dhcp_client *client, usec_t time_now)
{
- client->secs = (time_now - client->start_time) / USEC_PER_SEC;
+ client->secs = ((time_now - client->start_time) / USEC_PER_SEC) ? : 1;
return client->secs;
}
switch (client->state) {
case DHCP_STATE_RENEWING:
- time_left = (client->lease->t2 - client->lease->t1)/2;
+ time_left = (client->lease->t2 - client->lease->t1) / 2;
if (time_left < 60)
time_left = 60;
case DHCP_STATE_REBINDING:
- time_left = (client->lease->lifetime - client->lease->t2)/2;
+ time_left = (client->lease->lifetime - client->lease->t2) / 2;
if (time_left < 60)
time_left = 60;
next_timeout += (random_u32() & 0x1fffff);
- r = sd_event_add_monotonic(client->event, next_timeout,
+ client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_resend,
+ next_timeout,
10 * USEC_PER_MSEC,
- client_timeout_resend, client,
- &client->timeout_resend);
+ client_timeout_resend, client);
if (r < 0)
goto error;
- r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_resend,
+ client->event_priority);
if (r < 0)
goto error;
return 0;
}
-static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
+static int client_initialize_events(sd_dhcp_client *client,
+ sd_event_io_handler_t io_callback,
+ usec_t usec) {
int r;
assert(client);
assert(client->event);
- r = sd_event_add_io(client->event, client->fd, EPOLLIN,
- client_receive_message, client,
- &client->receive_message);
+ r = sd_event_add_io(client->event, &client->receive_message,
+ client->fd, EPOLLIN, io_callback,
+ client);
if (r < 0)
goto error;
- r = sd_event_source_set_priority(client->receive_message, client->event_priority);
+ r = sd_event_source_set_priority(client->receive_message,
+ client->event_priority);
if (r < 0)
goto error;
- r = sd_event_add_monotonic(client->event, usec, 0,
- client_timeout_resend, client,
- &client->timeout_resend);
+ client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_resend,
+ usec, 0,
+ client_timeout_resend, client);
if (r < 0)
goto error;
- r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_resend,
+ client->event_priority);
error:
if (r < 0)
void *userdata) {
sd_dhcp_client *client = userdata;
+ log_dhcp_client(client, "EXPIRED");
+
client_stop(client, DHCP_EVENT_EXPIRED);
return 0;
client->fd = r;
- return client_initialize_events(client, usec);
+ log_dhcp_client(client, "TIMEOUT T2");
+
+ return client_initialize_events(client, client_receive_message_raw,
+ usec);
}
-static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata) {
+static int client_timeout_t1(sd_event_source *s, uint64_t usec,
+ void *userdata) {
sd_dhcp_client *client = userdata;
int r;
client->attempt = 1;
r = dhcp_network_bind_udp_socket(client->index,
- client->lease->address);
+ client->lease->address,
+ DHCP_PORT_CLIENT);
if (r < 0) {
client_stop(client, r);
return 0;
client->fd = r;
- return client_initialize_events(client, usec);
-}
-
-static int client_parse_options(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 && !(len % 4)) {
- unsigned i;
-
- lease->dns_size = len / 4;
-
- free(lease->dns);
- lease->dns = new0(struct in_addr, lease->dns_size);
- if (!lease->dns)
- return -ENOMEM;
-
- for (i = 0; i < lease->dns_size; i++) {
- memcpy(&lease->dns[i].s_addr, option + 4 * i, 4);
- }
- }
-
- break;
-
- case DHCP_OPTION_INTERFACE_MTU:
- if (len >= 2) {
- be16_t mtu;
-
- memcpy(&mtu, option, 2);
- lease->mtu = be16toh(mtu);
-
- if (lease->mtu < 68)
- lease->mtu = 0;
- }
-
- break;
-
- case DHCP_OPTION_DOMAIN_NAME:
- if (len >= 1) {
- free(lease->domainname);
- lease->domainname = strndup((const char *)option, len);
- }
-
- break;
-
- case DHCP_OPTION_HOST_NAME:
- if (len >= 1) {
- free(lease->hostname);
- lease->hostname = strndup((const char *)option, len);
- }
-
- 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;
- }
+ log_dhcp_client(client, "TIMEOUT T1");
- return 0;
+ return client_initialize_events(client, client_receive_message_udp, usec);
}
-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;
-
- if (hdrlen + be16toh(message->udp.len) > len)
- return -EINVAL;
-
- if (message->udp.check) {
- message->ip.check = message->udp.len;
- message->ip.ttl = 0;
-
- if (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) {
- _cleanup_lease_free_ DHCPLease *lease = NULL;
+static int client_handle_offer(sd_dhcp_client *client, DHCPMessage *offer,
+ size_t len) {
+ _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
int r;
- r = client_verify_headers(client, offer, len);
+ r = dhcp_lease_new(&lease);
if (r < 0)
return r;
- lease = new0(DHCPLease, 1);
- if (!lease)
- return -ENOMEM;
-
- len = len - DHCP_IP_UDP_SIZE;
- r = dhcp_option_parse(&offer->dhcp, len, client_parse_options,
- lease);
+ r = dhcp_option_parse(offer, len, dhcp_lease_parse_options, lease);
if (r != DHCP_OFFER)
return -ENOMSG;
- lease->address = offer->dhcp.yiaddr;
+ lease->address = offer->yiaddr;
if (lease->address == INADDR_ANY ||
lease->server_address == INADDR_ANY ||
client->lease = lease;
lease = NULL;
+ log_dhcp_client(client, "OFFER");
+
return 0;
}
-static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
- size_t len) {
- DHCPPacket *ack;
- DHCPMessage *dhcp;
- _cleanup_lease_free_ DHCPLease *lease = NULL;
+static int client_handle_ack(sd_dhcp_client *client, DHCPMessage *ack,
+ size_t len) {
+ _cleanup_dhcp_lease_unref_ sd_dhcp_lease *lease = NULL;
int r;
- 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_lease_new(&lease);
+ if (r < 0)
+ return r;
- r = dhcp_option_parse(dhcp, len, client_parse_options, lease);
- if (r == DHCP_NAK)
+ r = dhcp_option_parse(ack, len, dhcp_lease_parse_options, lease);
+ if (r == DHCP_NAK) {
+ log_dhcp_client(client, "NAK");
return DHCP_EVENT_NO_LEASE;
+ }
if (r != DHCP_ACK)
return -ENOMSG;
- lease->address = dhcp->yiaddr;
+ lease->address = ack->yiaddr;
if (lease->address == INADDR_ANY ||
lease->server_address == INADDR_ANY ||
r = DHCP_EVENT_IP_CHANGE;
}
- lease_free(client->lease);
+ client->lease = sd_dhcp_lease_unref(client->lease);
}
client->lease = lease;
lease = NULL;
+ log_dhcp_client(client, "ACK");
+
return r;
}
if (next_timeout < usec)
return -EINVAL;
- r = sd_event_add_monotonic(client->event, next_timeout,
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_t1,
+ next_timeout,
10 * USEC_PER_MSEC,
- client_timeout_t1, client,
- &client->timeout_t1);
+ client_timeout_t1, client);
if (r < 0)
return r;
- r = sd_event_source_set_priority(client->timeout_t1, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_t1,
+ client->event_priority);
if (r < 0)
return r;
if (next_timeout < usec)
return -EINVAL;
- r = sd_event_add_monotonic(client->event, next_timeout,
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_t2,
+ next_timeout,
10 * USEC_PER_MSEC,
- client_timeout_t2, client,
- &client->timeout_t2);
+ client_timeout_t2, client);
if (r < 0)
return r;
- r = sd_event_source_set_priority(client->timeout_t2, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_t2,
+ client->event_priority);
if (r < 0)
return r;
if (next_timeout < usec)
return -EINVAL;
- r = sd_event_add_monotonic(client->event, next_timeout,
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_expire, next_timeout,
10 * USEC_PER_MSEC,
- client_timeout_expire, client,
- &client->timeout_expire);
+ client_timeout_expire, client);
if (r < 0)
return r;
- r = sd_event_source_set_priority(client->timeout_expire, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_expire,
+ client->event_priority);
if (r < 0)
return r;
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;
+static int client_handle_message(sd_dhcp_client *client, DHCPMessage *message,
+ int len, usec_t time_now) {
+ int r = 0, notify_event = 0;
- assert(s);
assert(client);
assert(client->event);
+ assert(message);
- len = read(fd, &buf, buflen);
- if (len < 0)
+ if (len < DHCP_MESSAGE_SIZE) {
+ log_dhcp_client(client, "message too small (%d bytes): "
+ "ignoring", len);
return 0;
+ }
- r = sd_event_get_now_monotonic(client->event, &time_now);
- if (r < 0)
- goto error;
+ if (message->op != BOOTREPLY) {
+ log_dhcp_client(client, "not a BOOTREPLY message: ignoring");
+ return 0;
+ }
+
+ if (be32toh(message->xid) != client->xid) {
+ log_dhcp_client(client, "received xid (%u) does not match "
+ "expected (%u): ignoring",
+ be32toh(message->xid), client->xid);
+ return 0;
+ }
+
+ if (memcmp(&message->chaddr[0], &client->mac_addr.ether_addr_octet,
+ ETHER_ADDR_LEN)) {
+ log_dhcp_client(client, "received chaddr does not match "
+ "expected: ignoring");
+ return 0;
+ }
switch (client->state) {
case DHCP_STATE_SELECTING:
- message = (DHCPPacket *)&buf;
-
- if (client_receive_offer(client, message, len) >= 0) {
+ r = client_handle_offer(client, message, len);
+ if (r >= 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,
+ r = sd_event_add_monotonic(client->event,
+ &client->timeout_resend,
+ time_now, 0,
client_timeout_resend,
- client,
- &client->timeout_resend);
+ client);
if (r < 0)
goto error;
- r = sd_event_source_set_priority(client->timeout_resend, client->event_priority);
+ r = sd_event_source_set_priority(client->timeout_resend,
+ client->event_priority);
if (r < 0)
goto error;
}
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
- r = client_receive_ack(client, buf, len);
+ r = client_handle_ack(client, message, len);
if (r == DHCP_EVENT_NO_LEASE)
goto error;
return 0;
}
+static int client_receive_message_udp(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata) {
+ sd_dhcp_client *client = userdata;
+ _cleanup_free_ DHCPMessage *message = NULL;
+ int buflen = 0, len, r;
+ usec_t time_now;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ r = ioctl(fd, FIONREAD, &buflen);
+ if (r < 0 || buflen <= 0)
+ buflen = sizeof(DHCPMessage) + DHCP_MIN_OPTIONS_SIZE;
+
+ message = malloc0(buflen);
+ if (!message)
+ return -ENOMEM;
+
+ len = read(fd, message, buflen);
+ if (len < 0)
+ return 0;
+
+ r = sd_event_get_now_monotonic(client->event, &time_now);
+ if (r < 0)
+ return client_stop(client, r);
+
+ return client_handle_message(client, message, len,
+ time_now);
+}
+
+static int client_receive_message_raw(sd_event_source *s, int fd,
+ uint32_t revents, void *userdata) {
+ sd_dhcp_client *client = userdata;
+ _cleanup_free_ DHCPPacket *packet = NULL;
+ int buflen = 0, len, r;
+ usec_t time_now;
+
+ assert(s);
+ assert(client);
+ assert(client->event);
+
+ r = ioctl(fd, FIONREAD, &buflen);
+ if (r < 0 || buflen <= 0)
+ buflen = sizeof(DHCPPacket) + DHCP_MIN_OPTIONS_SIZE;
+
+ packet = malloc0(buflen);
+ if (!packet)
+ return -ENOMEM;
+
+ len = read(fd, packet, buflen);
+ if (len < 0)
+ return 0;
+
+ r = dhcp_packet_verify_headers(packet, len);
+ if (r < 0)
+ return 0;
+
+ len -= DHCP_IP_UDP_SIZE;
+
+ r = sd_event_get_now_monotonic(client->event, &time_now);
+ if (r < 0)
+ return client_stop(client, r);
+
+ return client_handle_message(client, &packet->dhcp, len, time_now);
+}
+
int sd_dhcp_client_start(sd_dhcp_client *client) {
int r;
client->start_time = now(CLOCK_MONOTONIC);
client->secs = 0;
- return client_initialize_events(client, client->start_time);
+ log_dhcp_client(client, "STARTED");
+
+ return client_initialize_events(client, client_receive_message_raw,
+ client->start_time);
}
int sd_dhcp_client_stop(sd_dhcp_client *client) {
return client_stop(client, DHCP_EVENT_STOP);
}
-int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event, int priority) {
+int sd_dhcp_client_attach_event(sd_dhcp_client *client, sd_event *event,
+ int priority) {
int r;
assert_return(client, -EINVAL);
~ianmdlvl / elogind.git / blobdiff