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sd-dhcp-server: add basic functionality for starting/stopping server

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Bind to UDP socket and listen for messages, discarding anything we receive.
This commit is contained in:
Tom Gundersen 2014-05-24 19:27:20 +02:00
parent b44cd88210
commit ff734080aa
4 changed files with 100 additions and 0 deletions
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2
src/libsystemd-network/dhcp-server-internal.h
View File

@ -32,6 +32,8 @@ struct sd_dhcp_server {
sd_event *event;
int event_priority;
sd_event_source *receive_message;
int fd;
};
DEFINE_TRIVIAL_CLEANUP_FUNC(sd_dhcp_server*, sd_dhcp_server_unref);

89
src/libsystemd-network/sd-dhcp-server.c
View File

@ -20,8 +20,11 @@
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/ioctl.h>
#include "sd-dhcp-server.h"
#include "dhcp-server-internal.h"
#include "dhcp-internal.h"
sd_dhcp_server *sd_dhcp_server_ref(sd_dhcp_server *server) {
if (server)
@ -34,6 +37,8 @@ sd_dhcp_server *sd_dhcp_server_unref(sd_dhcp_server *server) {
if (server && REFCNT_DEC(server->n_ref) <= 0) {
log_dhcp_server(server, "UNREF");
sd_dhcp_server_stop(server);
sd_event_unref(server->event);
free(server);
}
@ -51,6 +56,7 @@ int sd_dhcp_server_new(sd_dhcp_server **ret) {
return -ENOMEM;
server->n_ref = REFCNT_INIT;
server->fd = -1;
*ret = server;
server = NULL;
@ -90,3 +96,86 @@ sd_event *sd_dhcp_server_get_event(sd_dhcp_server *server) {
return server->event;
}
int sd_dhcp_server_stop(sd_dhcp_server *server) {
assert_return(server, -EINVAL);
server->receive_message =
sd_event_source_unref(server->receive_message);
server->fd = safe_close(server->fd);
log_dhcp_server(server, "STOPPED");
return 0;
}
static int server_receive_message(sd_event_source *s, int fd,
uint32_t revents, void *userdata) {
_cleanup_free_ uint8_t *message = NULL;
sd_dhcp_server *server = userdata;
struct iovec iov = {};
struct msghdr msg = {
.msg_iov = &iov,
.msg_iovlen = 1,
};
int buflen = 0, len, r;
assert(server);
r = ioctl(fd, FIONREAD, &buflen);
if (r < 0)
return r;
if (buflen < 0)
return -EIO;
message = malloc0(buflen);
if (!message)
return -ENOMEM;
iov.iov_base = message;
iov.iov_len = buflen;
len = recvmsg(fd, &msg, 0);
if (len < buflen)
return 0;
log_dhcp_server(server, "received message");
return 1;
}
int sd_dhcp_server_start(sd_dhcp_server *server) {
int r;
assert_return(server, -EINVAL);
assert_return(server->event, -EINVAL);
assert_return(!server->receive_message, -EBUSY);
assert_return(server->fd == -1, -EBUSY);
r = dhcp_network_bind_udp_socket(INADDR_ANY, DHCP_PORT_SERVER);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
server->fd = r;
r = sd_event_add_io(server->event, &server->receive_message,
server->fd, EPOLLIN,
server_receive_message, server);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
r = sd_event_source_set_priority(server->receive_message,
server->event_priority);
if (r < 0) {
sd_dhcp_server_stop(server);
return r;
}
log_dhcp_server(server, "STARTED");
return 0;
}

6
src/libsystemd-network/test-dhcp-server.c
View File

@ -45,6 +45,12 @@ static void test_basic(sd_event *event) {
assert_se(sd_dhcp_server_ref(server) == server);
assert_se(!sd_dhcp_server_unref(server));
assert_se(sd_dhcp_server_start(server) >= 0);
assert_se(sd_dhcp_server_start(server) == -EBUSY);
assert_se(sd_dhcp_server_stop(server) >= 0);
assert_se(sd_dhcp_server_stop(server) >= 0);
assert_se(sd_dhcp_server_start(server) >= 0);
}
int main(int argc, char *argv[]) {

3
src/systemd/sd-dhcp-server.h
View File

@ -38,4 +38,7 @@ int sd_dhcp_server_attach_event(sd_dhcp_server *client, sd_event *event, int pri
int sd_dhcp_server_detach_event(sd_dhcp_server *client);
sd_event *sd_dhcp_server_get_event(sd_dhcp_server *client);
int sd_dhcp_server_start(sd_dhcp_server *server);
int sd_dhcp_server_stop(sd_dhcp_server *server);
#endif