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-rw-r--r--src/libsystemd/sd-dhcp-client.c196
1 files changed, 79 insertions, 117 deletions
diff --git a/src/libsystemd/sd-dhcp-client.c b/src/libsystemd/sd-dhcp-client.c
index c5bc115f42..26ed35e5fe 100644
--- a/src/libsystemd/sd-dhcp-client.c
+++ b/src/libsystemd/sd-dhcp-client.c
@@ -87,8 +87,7 @@ 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)
-{
+ void *userdata) {
assert_return(client, -EINVAL);
client->cb = cb;
@@ -97,8 +96,7 @@ int sd_dhcp_client_set_callback(sd_dhcp_client *client, sd_dhcp_client_cb_t cb,
return 0;
}
-int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option)
-{
+int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option) {
size_t i;
assert_return(client, -EINVAL);
@@ -130,8 +128,7 @@ int sd_dhcp_client_set_request_option(sd_dhcp_client *client, uint8_t option)
}
int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
- const struct in_addr *last_addr)
-{
+ const struct in_addr *last_addr) {
assert_return(client, -EINVAL);
assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
@@ -143,8 +140,7 @@ int sd_dhcp_client_set_request_address(sd_dhcp_client *client,
return 0;
}
-int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
-{
+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);
@@ -155,8 +151,7 @@ int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index)
}
int sd_dhcp_client_set_mac(sd_dhcp_client *client,
- const struct ether_addr *addr)
-{
+ const struct ether_addr *addr) {
assert_return(client, -EINVAL);
assert_return(client->state == DHCP_STATE_INIT, -EBUSY);
@@ -165,8 +160,7 @@ int sd_dhcp_client_set_mac(sd_dhcp_client *client,
return 0;
}
-int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
-{
+int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr) {
assert_return(client, -EINVAL);
assert_return(addr, -EINVAL);
@@ -189,8 +183,7 @@ int sd_dhcp_client_get_address(sd_dhcp_client *client, struct in_addr *addr)
return 0;
}
-int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu)
-{
+int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu) {
assert_return(client, -EINVAL);
assert_return(mtu, -EINVAL);
@@ -216,8 +209,7 @@ int sd_dhcp_client_get_mtu(sd_dhcp_client *client, uint16_t *mtu)
return 0;
}
-int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t *addr_size)
-{
+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);
@@ -245,8 +237,7 @@ int sd_dhcp_client_get_dns(sd_dhcp_client *client, struct in_addr **addr, size_t
return 0;
}
-int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname)
-{
+int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname) {
assert_return(client, -EINVAL);
assert_return(hostname, -EINVAL);
@@ -272,8 +263,7 @@ int sd_dhcp_client_get_hostname(sd_dhcp_client *client, const char **hostname)
return 0;
}
-int sd_dhcp_client_prefixlen(const struct in_addr *addr)
-{
+int sd_dhcp_client_prefixlen(const struct in_addr *addr) {
int len = 0;
uint32_t mask;
@@ -288,8 +278,7 @@ int sd_dhcp_client_prefixlen(const struct in_addr *addr)
return len;
}
-int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
-{
+int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr) {
assert_return(client, -EINVAL);
assert_return(addr, -EINVAL);
@@ -312,8 +301,7 @@ int sd_dhcp_client_get_router(sd_dhcp_client *client, struct in_addr *addr)
return 0;
}
-int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
-{
+int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr) {
assert_return(client, -EINVAL);
assert_return(addr, -EINVAL);
@@ -336,16 +324,26 @@ int sd_dhcp_client_get_netmask(sd_dhcp_client *client, struct in_addr *addr)
return 0;
}
-static int client_notify(sd_dhcp_client *client, int event)
-{
+static int client_notify(sd_dhcp_client *client, int event) {
if (client->cb)
client->cb(client, event, client->userdata);
return 0;
}
-static int client_stop(sd_dhcp_client *client, int error)
-{
+static void lease_free(DHCPLease *lease) {
+ if (!lease)
+ return;
+
+ free(lease->hostname);
+ 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->receive_message =
@@ -385,8 +383,7 @@ static int client_stop(sd_dhcp_client *client, int error)
}
if (client->lease) {
- free(client->lease->dns);
- free(client->lease);
+ lease_free(client->lease);
client->lease = NULL;
}
@@ -395,8 +392,7 @@ static int client_stop(sd_dhcp_client *client, int error)
static int client_packet_init(sd_dhcp_client *client, uint8_t type,
DHCPMessage *message, uint16_t secs,
- uint8_t **opt, size_t *optlen)
-{
+ uint8_t **opt, size_t *optlen) {
int err;
be16_t max_size;
@@ -462,8 +458,7 @@ static int client_packet_init(sd_dhcp_client *client, uint8_t type,
return 0;
}
-static uint16_t client_checksum(void *buf, int len)
-{
+static uint16_t client_checksum(void *buf, int len) {
uint32_t sum;
uint16_t *check;
int i;
@@ -486,8 +481,7 @@ static uint16_t client_checksum(void *buf, int len)
return ~sum;
}
-static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
-{
+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);
@@ -508,8 +502,7 @@ static void client_append_ip_headers(DHCPPacket *packet, uint16_t len)
packet->ip.check = client_checksum(&packet->ip, DHCP_IP_SIZE);
}
-static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
-{
+static int client_send_discover(sd_dhcp_client *client, uint16_t secs) {
int err = 0;
_cleanup_free_ DHCPPacket *discover;
size_t optlen, len;
@@ -548,8 +541,7 @@ static int client_send_discover(sd_dhcp_client *client, uint16_t secs)
return err;
}
-static int client_send_request(sd_dhcp_client *client, uint16_t secs)
-{
+static int client_send_request(sd_dhcp_client *client, uint16_t secs) {
_cleanup_free_ DHCPPacket *request;
size_t optlen, len;
int err;
@@ -601,8 +593,7 @@ static int client_send_request(sd_dhcp_client *client, uint16_t secs)
}
static int client_timeout_resend(sd_event_source *s, uint64_t usec,
- void *userdata)
-{
+ void *userdata) {
sd_dhcp_client *client = userdata;
usec_t next_timeout = 0;
uint32_t time_left;
@@ -703,8 +694,7 @@ error:
return 0;
}
-static int client_initialize_events(sd_dhcp_client *client, usec_t usec)
-{
+static int client_initialize_events(sd_dhcp_client *client, usec_t usec) {
int r;
r = sd_event_add_io(client->event, client->fd, EPOLLIN,
@@ -726,8 +716,7 @@ error:
}
static int client_timeout_expire(sd_event_source *s, uint64_t usec,
- void *userdata)
-{
+ void *userdata) {
sd_dhcp_client *client = userdata;
client_stop(client, DHCP_EVENT_EXPIRED);
@@ -735,8 +724,7 @@ static int client_timeout_expire(sd_event_source *s, uint64_t usec,
return 0;
}
-static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
-{
+static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
sd_dhcp_client *client = userdata;
int r;
@@ -761,8 +749,7 @@ static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata)
return client_initialize_events(client, 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;
@@ -782,8 +769,7 @@ static int client_timeout_t1(sd_event_source *s, uint64_t usec, void *userdata)
}
static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
- void *user_data)
-{
+ void *user_data) {
DHCPLease *lease = user_data;
be32_t val;
@@ -875,8 +861,7 @@ static int client_parse_offer(uint8_t code, uint8_t len, const uint8_t *option,
}
static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
- size_t len)
-{
+ size_t len) {
size_t hdrlen;
if (len < (DHCP_IP_UDP_SIZE + DHCP_MESSAGE_SIZE))
@@ -912,23 +897,23 @@ static int client_verify_headers(sd_dhcp_client *client, DHCPPacket *message,
}
static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
- size_t len)
-{
- int err;
- DHCPLease *lease;
+ size_t len) {
+ _cleanup_lease_free_ DHCPLease *lease = NULL;
+ int r;
- err = client_verify_headers(client, offer, len);
- if (err < 0)
- return err;
+ r = client_verify_headers(client, offer, len);
+ if (r < 0)
+ return r;
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;
+ r = dhcp_option_parse(&offer->dhcp, len, client_parse_offer,
+ lease);
+ if (r != DHCP_OFFER)
+ return -ENOMSG;
lease->address = offer->dhcp.yiaddr;
@@ -936,25 +921,20 @@ static int client_receive_offer(sd_dhcp_client *client, DHCPPacket *offer,
lease->server_address == INADDR_ANY ||
lease->subnet_mask == INADDR_ANY ||
lease->lifetime == 0)
- goto error;
+ return -ENOMSG;
client->lease = lease;
+ lease = NULL;
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;
+ size_t len) {
DHCPPacket *ack;
DHCPMessage *dhcp;
- DHCPLease *lease;
+ _cleanup_lease_free_ DHCPLease *lease = NULL;
+ int r;
if (client->state == DHCP_STATE_RENEWING) {
dhcp = (DHCPMessage *)buf;
@@ -974,25 +954,18 @@ static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
return -ENOMEM;
r = dhcp_option_parse(dhcp, len, client_parse_offer, lease);
+ if (r == DHCP_NAK)
+ return DHCP_EVENT_NO_LEASE;
- if (r == DHCP_NAK) {
- r = DHCP_EVENT_NO_LEASE;
- goto error;
- }
-
- if (r != DHCP_ACK) {
- r = -ENOMSG;
- goto error;
- }
+ if (r != DHCP_ACK)
+ return -ENOMSG;
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;
- }
+ lease->subnet_mask == INADDR_ANY || lease->lifetime == 0)
+ return -ENOMSG;
r = DHCP_EVENT_IP_ACQUIRE;
if (client->lease) {
@@ -1002,30 +975,24 @@ static int client_receive_ack(sd_dhcp_client *client, const uint8_t *buf,
r = DHCP_EVENT_IP_CHANGE;
}
- free(client->lease);
+ lease_free(client->lease);
}
client->lease = lease;
-
- return r;
-
-error:
- free(lease);
+ lease = NULL;
return r;
}
static uint64_t client_compute_timeout(uint64_t request_sent,
- uint32_t lifetime)
-{
+ 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;
+static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec) {
uint64_t next_timeout;
+ int r;
if (client->lease->lifetime < 10)
return -EINVAL;
@@ -1042,12 +1009,12 @@ static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
if (next_timeout < usec)
return -EINVAL;
- err = sd_event_add_monotonic(client->event, next_timeout,
+ r = 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 (r < 0)
+ return r;
if (!client->lease->t2)
client->lease->t2 = client->lease->lifetime * 7 / 8;
@@ -1063,31 +1030,30 @@ static int client_set_lease_timeouts(sd_dhcp_client *client, uint64_t usec)
if (next_timeout < usec)
return -EINVAL;
- err = sd_event_add_monotonic(client->event, next_timeout,
+ r = sd_event_add_monotonic(client->event, next_timeout,
10 * USEC_PER_MSEC,
client_timeout_t2, client,
&client->timeout_t2);
- if (err < 0)
- return err;
+ if (r < 0)
+ return r;
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,
+ r = sd_event_add_monotonic(client->event, next_timeout,
10 * USEC_PER_MSEC,
client_timeout_expire, client,
&client->timeout_expire);
- if (err < 0)
- return err;
+ if (r < 0)
+ return r;
return 0;
}
static int client_receive_message(sd_event_source *s, int fd,
- uint32_t revents, void *userdata)
-{
+ uint32_t revents, void *userdata) {
sd_dhcp_client *client = userdata;
uint8_t buf[sizeof(DHCPPacket) + DHCP_CLIENT_MIN_OPTIONS_SIZE];
int buflen = sizeof(buf);
@@ -1181,8 +1147,7 @@ error:
return 0;
}
-int sd_dhcp_client_start(sd_dhcp_client *client)
-{
+int sd_dhcp_client_start(sd_dhcp_client *client) {
int r;
assert_return(client, -EINVAL);
@@ -1205,13 +1170,11 @@ int sd_dhcp_client_start(sd_dhcp_client *client)
return client_initialize_events(client, client->start_time);
}
-int sd_dhcp_client_stop(sd_dhcp_client *client)
-{
+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)
-{
+sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client) {
assert_return(client, NULL);
sd_dhcp_client_stop(client);
@@ -1223,8 +1186,7 @@ sd_dhcp_client *sd_dhcp_client_free(sd_dhcp_client *client)
return NULL;
}
-sd_dhcp_client *sd_dhcp_client_new(sd_event *event)
-{
+sd_dhcp_client *sd_dhcp_client_new(sd_event *event) {
sd_dhcp_client *client;
assert_return(event, NULL);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-18 19:37:12 +0000