*/
#include "common.h"
-#include "dhcpd.h"
#include "options.h"
/* constants */
-#define SELECT_TIMEOUT 5 /* select timeout in sec. */
-#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */
-#define MAX_INTERFACES 9
-
+#define SERVER_PORT 67
+#define SELECT_TIMEOUT 5 /* select timeout in sec. */
+#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */
/* This list holds information about clients. The xid_* functions manipulate this list. */
-static struct xid_item {
+struct xid_item {
+ unsigned timestamp;
+ int client;
uint32_t xid;
struct sockaddr_in ip;
- int client;
- time_t timestamp;
struct xid_item *next;
-} dhcprelay_xid_list = {0, {0}, 0, 0, NULL};
+};
+#define dhcprelay_xid_list (*(struct xid_item*)&bb_common_bufsiz1)
static struct xid_item *xid_add(uint32_t xid, struct sockaddr_in *ip, int client)
{
item->ip = *ip;
item->xid = xid;
item->client = client;
- item->timestamp = time(NULL);
+ item->timestamp = monotonic_sec();
item->next = dhcprelay_xid_list.next;
dhcprelay_xid_list.next = item;
{
struct xid_item *item = dhcprelay_xid_list.next;
struct xid_item *last = &dhcprelay_xid_list;
- time_t current_time = time(NULL);
+ unsigned current_time = monotonic_sec();
while (item != NULL) {
if ((current_time - item->timestamp) > MAX_LIFETIME) {
return -1;
}
-/**
- * signal_handler - handles signals ;-)
- * sig - sent signal
- */
-static smallint dhcprelay_stopflag;
-
-static void dhcprelay_signal_handler(int sig)
-{
- dhcprelay_stopflag = 1;
-}
-
/**
* get_client_devices - parses the devices list
* dev_list - comma separated list of devices
*/
static char **get_client_devices(char *dev_list, int *client_number)
{
- char *s, *list, **client_dev;
+ char *s, **client_dev;
int i, cn;
/* copy list */
- list = xstrdup(dev_list);
- if (list == NULL) return NULL;
-
- /* get number of items */
- for (s = dev_list, cn = 1; *s; s++)
- if (*s == ',')
+ dev_list = xstrdup(dev_list);
+
+ /* get number of items, replace ',' with NULs */
+ s = dev_list;
+ cn = 1;
+ while (*s) {
+ if (*s == ',') {
+ *s = '\0';
cn++;
+ }
+ s++;
+ }
+ *client_number = cn;
+ /* create vector of pointers */
client_dev = xzalloc(cn * sizeof(*client_dev));
-
- /* parse list */
- s = strtok(list, ",");
- i = 0;
- while (s != NULL) {
- client_dev[i++] = xstrdup(s);
- s = strtok(NULL, ",");
+ client_dev[0] = dev_list;
+ i = 1;
+ while (i != cn) {
+ client_dev[i] = client_dev[i - 1] + strlen(client_dev[i - 1]) + 1;
+ i++;
}
-
- /* free copy and exit */
- free(list);
- *client_number = cn;
return client_dev;
}
-/* Creates listen sockets (in fds) and returns the number allocated. */
+/* Creates listen sockets (in fds) and returns numerically max fd. */
static int init_sockets(char **client, int num_clients,
- char *server, int *fds, int *max_socket)
+ char *server, int *fds)
{
- int i;
+ int i, n;
/* talk to real server on bootps */
- fds[0] = listen_socket(/*INADDR_ANY,*/ 67, server);
- *max_socket = fds[0];
-
- /* array starts at 1 since server is 0 */
- num_clients++;
+ fds[0] = listen_socket(/*INADDR_ANY,*/ SERVER_PORT, server);
+ n = fds[0];
for (i = 1; i < num_clients; i++) {
/* listen for clients on bootps */
- fds[i] = listen_socket(/*NADDR_ANY,*/ 67, client[i-1]);
- if (fds[i] > *max_socket)
- *max_socket = fds[i];
+ fds[i] = listen_socket(/*INADDR_ANY,*/ SERVER_PORT, client[i-1]);
+ if (fds[i] > n)
+ n = fds[i];
}
-
- return i;
+ return n;
}
if (item->ip.sin_addr.s_addr == htonl(INADDR_ANY))
item->ip.sin_addr.s_addr = htonl(INADDR_BROADCAST);
- if (item->client > MAX_INTERFACES)
- return;
res = sendto(fds[item->client], p, packet_len, 0, (struct sockaddr*)(&item->ip),
sizeof(item->ip));
if (res != packet_len) {
xid_del(p->xid);
}
+static void dhcprelay_loop(int *fds, int num_sockets, int max_socket, char **clients,
+ struct sockaddr_in *server_addr, uint32_t gw_ip) ATTRIBUTE_NORETURN;
static void dhcprelay_loop(int *fds, int num_sockets, int max_socket, char **clients,
struct sockaddr_in *server_addr, uint32_t gw_ip)
{
struct timeval tv;
int i;
- while (!dhcprelay_stopflag) {
+ while (1) {
FD_ZERO(&rfds);
for (i = 0; i < num_sockets; i++)
FD_SET(fds[i], &rfds);
if (select(max_socket + 1, &rfds, NULL, NULL, &tv) > 0) {
/* server */
if (FD_ISSET(fds[0], &rfds)) {
- packlen = udhcp_get_packet(&dhcp_msg, fds[0]);
+ packlen = udhcp_recv_packet(&dhcp_msg, fds[0]);
if (packlen > 0) {
pass_back(&dhcp_msg, packlen, fds);
}
}
}
-int dhcprelay_main(int argc, char **argv);
+int dhcprelay_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dhcprelay_main(int argc, char **argv)
{
- int i, num_sockets, max_socket, fds[MAX_INTERFACES];
+ int num_sockets, max_socket;
+ int *fds;
uint32_t gw_ip;
char **clients;
struct sockaddr_in server_addr;
server_addr.sin_family = AF_INET;
- server_addr.sin_port = htons(67);
+ server_addr.sin_port = htons(SERVER_PORT);
if (argc == 4) {
if (!inet_aton(argv[3], &server_addr.sin_addr))
bb_perror_msg_and_die("didn't grok server");
} else {
bb_show_usage();
}
- clients = get_client_devices(argv[1], &num_sockets);
- if (!clients) return 0;
-
- signal(SIGTERM, dhcprelay_signal_handler);
- signal(SIGQUIT, dhcprelay_signal_handler);
- signal(SIGINT, dhcprelay_signal_handler);
- num_sockets = init_sockets(clients, num_sockets, argv[2], fds, &max_socket);
+ clients = get_client_devices(argv[1], &num_sockets);
+ num_sockets++; /* for server socket at fds[0] */
+ fds = xmalloc(num_sockets * sizeof(fds[0]));
+ max_socket = init_sockets(clients, num_sockets, argv[2], fds);
if (read_interface(argv[2], NULL, &gw_ip, NULL))
return 1;
+ /* doesn't return */
dhcprelay_loop(fds, num_sockets, max_socket, clients, &server_addr, gw_ip);
-
- if (ENABLE_FEATURE_CLEAN_UP) {
- for (i = 0; i < num_sockets; i++) {
- close(fds[i]);
- free(clients[i]);
- }
- }
-
- return 0;
+ /* return 0; - not reached */
}
projects / oweals / busybox.git / blobdiff