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path: root/src/libsystemd-dhcp/dhcp-client.c
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Diffstat (limited to 'src/libsystemd-dhcp/dhcp-client.c')
-rw-r--r--src/libsystemd-dhcp/dhcp-client.c142
1 files changed, 116 insertions, 26 deletions
diff --git a/src/libsystemd-dhcp/dhcp-client.c b/src/libsystemd-dhcp/dhcp-client.c
index b1bdd38593..a15866932c 100644
--- a/src/libsystemd-dhcp/dhcp-client.c
+++ b/src/libsystemd-dhcp/dhcp-client.c
@@ -137,6 +137,11 @@ int sd_dhcp_client_set_mac(sd_dhcp_client *client,
return 0;
}
+static int client_notify(sd_dhcp_client *client, int event)
+{
+ return 0;
+}
+
static int client_stop(sd_dhcp_client *client, int error)
{
assert_return(client, -EINVAL);
@@ -158,6 +163,7 @@ static int client_stop(sd_dhcp_client *client, int error)
case DHCP_STATE_INIT:
case DHCP_STATE_SELECTING:
+ case DHCP_STATE_REQUESTING:
client->start_time = 0;
client->state = DHCP_STATE_INIT;
@@ -165,7 +171,6 @@ static int client_stop(sd_dhcp_client *client, int error)
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REBOOTING:
- case DHCP_STATE_REQUESTING:
case DHCP_STATE_BOUND:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
@@ -481,41 +486,53 @@ static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
return 0;
}
-static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
- size_t len)
+static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
+ size_t len)
{
size_t hdrlen;
- DHCPLease *lease;
if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
return -EINVAL;
- hdrlen = offer->ip.ihl * 4;
- if (hdrlen < 20 || hdrlen > len || client_checksum(&offer->ip,
+ hdrlen = message->ip.ihl * 4;
+ if (hdrlen < 20 || hdrlen > len || client_checksum(&message->ip,
hdrlen))
return -EINVAL;
- offer->ip.check = offer->udp.len;
- offer->ip.ttl = 0;
+ message->ip.check = message->udp.len;
+ message->ip.ttl = 0;
- if (hdrlen + be16toh(offer->udp.len) > len ||
- client_checksum(&offer->ip.ttl, be16toh(offer->udp.len) + 12))
+ if (hdrlen + be16toh(message->udp.len) > len ||
+ client_checksum(&message->ip.ttl, be16toh(message->udp.len) + 12))
return -EINVAL;
- if (be16toh(offer->udp.source) != DHCP_PORT_SERVER ||
- be16toh(offer->udp.dest) != DHCP_PORT_CLIENT)
+ if (be16toh(message->udp.source) != DHCP_PORT_SERVER ||
+ be16toh(message->udp.dest) != DHCP_PORT_CLIENT)
return -EINVAL;
- if (offer->dhcp.op != BOOTREPLY)
+ if (message->dhcp.op != BOOTREPLY)
return -EINVAL;
- if (be32toh(offer->dhcp.xid) != client->xid)
+ if (be32toh(message->dhcp.xid) != client->xid)
return -EINVAL;
- if (memcmp(&offer->dhcp.chaddr[0], &client->mac_addr.ether_addr_octet,
+ 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;
@@ -543,13 +560,63 @@ error:
return -ENOMSG;
}
+static int client_receive_ack(sd_dhcp_client *client, DHCPPacket *offer,
+ size_t len)
+{
+ int r;
+ DHCPLease *lease;
+
+ r = client_verify_headers(client, offer, len);
+ if (r < 0)
+ return r;
+
+ lease = new0(DHCPLease, 1);
+ if (!lease)
+ return -ENOBUFS;
+
+ len = len - DHCP_IP_UDP_SIZE;
+ r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer, lease);
+
+ if (r != DHCP_ACK)
+ 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) {
+ 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 int client_receive_raw_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, err = 0;
+ int len, r = 0;
DHCPPacket *message;
usec_t time_now;
@@ -557,8 +624,8 @@ static int client_receive_raw_message(sd_event_source *s, int fd,
if (len < 0)
return 0;
- err = sd_event_get_now_monotonic(client->event, &time_now);
- if (err < 0)
+ r = sd_event_get_now_monotonic(client->event, &time_now);
+ if (r < 0)
goto error;
message = (DHCPPacket *)&buf;
@@ -574,20 +641,43 @@ static int client_receive_raw_message(sd_event_source *s, int fd,
client->state = DHCP_STATE_REQUESTING;
client->attempt = 1;
- err = sd_event_add_monotonic(client->event, time_now, 0,
- client_timeout_resend,
- client,
- &client->timeout_resend);
- if (err < 0)
+ 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:
+
+ r = client_receive_ack(client, message, len);
+ if (r == DHCP_EVENT_NO_LEASE)
+ goto error;
+
+ if (r >= 0) {
+ client->timeout_resend =
+ sd_event_source_unref(client->timeout_resend);
+
+ client->state = DHCP_STATE_BOUND;
+ client->attempt = 1;
+
+ client->last_addr = client->lease->address;
+
+ client_notify(client, DHCP_EVENT_IP_ACQUIRE);
+
+ close(client->fd);
+ client->fd = -1;
+ client->receive_message =
+ sd_event_source_unref(client->receive_message);
+ }
+ break;
+
case DHCP_STATE_INIT:
case DHCP_STATE_INIT_REBOOT:
case DHCP_STATE_REBOOTING:
- case DHCP_STATE_REQUESTING:
case DHCP_STATE_BOUND:
case DHCP_STATE_RENEWING:
case DHCP_STATE_REBINDING:
@@ -596,8 +686,8 @@ static int client_receive_raw_message(sd_event_source *s, int fd,
}
error:
- if (err < 0)
- return client_stop(client, err);
+ if (r < 0)
+ return client_stop(client, r);
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-12 00:50:25 +0000