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/*
* Server Side of the Dynamic Host Configuration Protocol for IPv4
*
* XXX
*/
#include <assert.h>
#include <c-list.h>
#include <c-stdaux.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/time.h>
#include <sys/timerfd.h>
#include <time.h>
#include <unistd.h>
#include "n-dhcp4.h"
#include "n-dhcp4-private.h"
#include "util/packet.h"
/**
* n_dhcp4_server_config_new() - XXX
*/
_c_public_ int n_dhcp4_server_config_new(NDhcp4ServerConfig **configp) {
_c_cleanup_(n_dhcp4_server_config_freep) NDhcp4ServerConfig *config = NULL;
config = calloc(1, sizeof(*config));
if (!config)
return -ENOMEM;
*config = (NDhcp4ServerConfig)N_DHCP4_SERVER_CONFIG_NULL(*config);
*configp = config;
config = NULL;
return 0;
}
/**
* n_dhcp4_server_config_free() - XXX
*/
_c_public_ NDhcp4ServerConfig *n_dhcp4_server_config_free(NDhcp4ServerConfig *config) {
if (!config)
return NULL;
free(config);
return NULL;
}
/**
* n_dhcp4_server_config_set_ifindex() - XXX
*/
_c_public_ void n_dhcp4_server_config_set_ifindex(NDhcp4ServerConfig *config, int ifindex) {
config->ifindex = ifindex;
}
/**
* n_dhcp4_s_event_node_new() - XXX
*/
int n_dhcp4_s_event_node_new(NDhcp4SEventNode **nodep) {
NDhcp4SEventNode *node;
node = calloc(1, sizeof(*node));
if (!node)
return -ENOMEM;
*node = (NDhcp4SEventNode)N_DHCP4_S_EVENT_NODE_NULL(*node);
*nodep = node;
return 0;
}
/**
* n_dhcp4_s_event_node_free() - XXX
*/
NDhcp4SEventNode *n_dhcp4_s_event_node_free(NDhcp4SEventNode *node) {
if (!node)
return NULL;
c_list_unlink(&node->server_link);
free(node);
return NULL;
}
/**
* n_dhcp4_server_new() - XXX
*/
_c_public_ int n_dhcp4_server_new(NDhcp4Server **serverp, NDhcp4ServerConfig *config) {
_c_cleanup_(n_dhcp4_server_unrefp) NDhcp4Server *server = NULL;
int r;
c_assert(serverp);
server = malloc(sizeof(*server));
if (!server)
return -ENOMEM;
*server = (NDhcp4Server)N_DHCP4_SERVER_NULL(*server);
r = n_dhcp4_s_connection_init(&server->connection, config->ifindex);
if (r)
return r;
*serverp = server;
server = NULL;
return 0;
}
static void n_dhcp4_server_free(NDhcp4Server *server) {
NDhcp4SEventNode *node, *t_node;
c_list_for_each_entry_safe(node, t_node, &server->event_list, server_link)
n_dhcp4_s_event_node_free(node);
free(server);
}
/**
* n_dhcp4_server_ref() - XXX
*/
_c_public_ NDhcp4Server *n_dhcp4_server_ref(NDhcp4Server *server) {
if (server)
++server->n_refs;
return server;
}
/**
* n_dhcp4_server_unref() - XXX
*/
_c_public_ NDhcp4Server *n_dhcp4_server_unref(NDhcp4Server *server) {
if (server && !--server->n_refs)
n_dhcp4_server_free(server);
return NULL;
}
/**
* n_dhcp4_server_raise() - XXX
*/
int n_dhcp4_server_raise(NDhcp4Server *server, NDhcp4SEventNode **nodep, unsigned int event) {
NDhcp4SEventNode *node;
int r;
r = n_dhcp4_s_event_node_new(&node);
if (r)
return r;
node->event.event = event;
c_list_link_tail(&server->event_list, &node->server_link);
if (nodep)
*nodep = node;
return 0;
}
/**
* n_dhcp4_server_get_fd() - XXX
*/
_c_public_ void n_dhcp4_server_get_fd(NDhcp4Server *server, int *fdp) {
n_dhcp4_s_connection_get_fd(&server->connection, fdp);
}
/**
* n_dhcp4_server_dispatch() - XXX
*/
_c_public_ int n_dhcp4_server_dispatch(NDhcp4Server *server) {
int r;
for (unsigned int i = 0; i < 128; ++i) {
_c_cleanup_(n_dhcp4_incoming_freep) NDhcp4Incoming *message = NULL;
r = n_dhcp4_s_connection_dispatch_io(&server->connection, &message);
if (r) {
if (r == N_DHCP4_E_AGAIN)
return 0;
return r;
}
}
return N_DHCP4_E_PREEMPTED;
}
/**
* n_dhcp4_server_pop_event() - XXX
*/
_c_public_ int n_dhcp4_server_pop_event(NDhcp4Server *server, NDhcp4ServerEvent **eventp) {
NDhcp4SEventNode *node, *t_node;
c_list_for_each_entry_safe(node, t_node, &server->event_list, server_link) {
if (node->is_public) {
n_dhcp4_s_event_node_free(node);
continue;
}
node->is_public = true;
*eventp = &node->event;
return 0;
}
*eventp = NULL;
return 0;
}
/**
* n_dhcp4_server_add_ip() - XXX
*/
_c_public_ int n_dhcp4_server_add_ip(NDhcp4Server *server, NDhcp4ServerIp **ipp, struct in_addr addr) {
_c_cleanup_(n_dhcp4_server_ip_freep) NDhcp4ServerIp *ip = NULL;
/* XXX: support more than one address */
if (server->connection.ip)
return -EBUSY;
ip = malloc(sizeof(*ip));
if (!ip)
return -ENOMEM;
*ip = (NDhcp4ServerIp)N_DHCP4_SERVER_IP_NULL(*ip);
n_dhcp4_s_connection_ip_init(&ip->ip, addr);
n_dhcp4_s_connection_ip_link(&ip->ip, &server->connection);
*ipp = ip;
ip = NULL;
return 0;
}
/**
* n_dhcp4_server_ip_free() - XXX
*/
_c_public_ NDhcp4ServerIp *n_dhcp4_server_ip_free(NDhcp4ServerIp *ip) {
if (!ip)
return NULL;
n_dhcp4_s_connection_ip_unlink(&ip->ip);
n_dhcp4_s_connection_ip_deinit(&ip->ip);
free(ip);
return NULL;
}
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