mirror of
https://github.com/topjohnwu/ndk-busybox.git
synced 2024-12-05 10:27:15 +00:00
dhcprelay: new applet
This commit is contained in:
parent
c9cdeaa3fe
commit
736230e209
@ -94,6 +94,7 @@ USE_DELGROUP(APPLET_ODDNAME(delgroup, deluser, _BB_DIR_BIN, _BB_SUID_NEVER, delg
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USE_DELUSER(APPLET(deluser, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_DEVFSD(APPLET(devfsd, _BB_DIR_SBIN, _BB_SUID_NEVER))
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USE_DF(APPLET(df, _BB_DIR_BIN, _BB_SUID_NEVER))
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USE_APP_DHCPRELAY(APPLET(dhcprelay, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
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USE_DIFF(APPLET(diff, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_DIRNAME(APPLET(dirname, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
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USE_DMESG(APPLET(dmesg, _BB_DIR_BIN, _BB_SUID_NEVER))
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@ -539,6 +539,16 @@ USE_FEATURE_DATE_ISOFMT( \
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"Filesystem 1k-blocks Used Available Use% Mounted on\n" \
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"/dev/sda3 8690864 8553540 137324 98% /\n"
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#define dhcprelay_trivial_usage \
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"[client_device_list] [server_device]"
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#define dhcprelay_full_usage \
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"Relays dhcp requests from client devices to server device"
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#define dhcprelay_trivial_usage \
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"[client_device_list] [server_device]"
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#define dhcprelay_full_usage \
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"Relays dhcp requests from client devices to server device"
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#define diff_trivial_usage \
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"[-abdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2"
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#define diff_full_usage \
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@ -598,6 +598,9 @@ static const struct address_family_t *get_address_family(const struct address_fa
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{
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int i;
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if (!name)
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return NULL;
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for (i = 0; af[i]; i++) {
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if (strcmp(af[i]->name, name) == 0) {
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return af[i];
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@ -610,6 +613,9 @@ static const struct method_t *get_method(const struct address_family_t *af, char
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{
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int i;
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if (!name)
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return NULL;
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for (i = 0; i < af->n_methods; i++) {
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if (strcmp(af->method[i].name, name) == 0) {
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return &af->method[i];
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@ -620,6 +626,9 @@ static const struct method_t *get_method(const struct address_family_t *af, char
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static const llist_t *find_list_string(const llist_t *list, const char *string)
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{
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if (string == NULL)
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return NULL;
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while (list) {
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if (strcmp(list->data, string) == 0) {
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return list;
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@ -12,6 +12,15 @@ config APP_UDHCPD
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See http://udhcp.busybox.net for further details.
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config APP_DHCPRELAY
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bool "dhcprelay"
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default n
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depends on APP_UDHCPD
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help
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dhcprelay listens for dhcp requests on one or more interfaces
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and forwards these requests to a different interface or dhcp
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server.
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config APP_DUMPLEASES
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bool "Lease display utility (dumpleases)"
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default n
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@ -15,3 +15,4 @@ lib-$(CONFIG_APP_UDHCPC) += dhcpc.o clientpacket.o clientsocket.o \
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lib-$(CONFIG_APP_UDHCPD) += dhcpd.o arpping.o files.o leases.o \
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serverpacket.o static_leases.o
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lib-$(CONFIG_APP_DUMPLEASES) += dumpleases.o
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lib-$(CONFIG_APP_DHCPRELAY) += dhcprelay.o
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339
networking/udhcp/dhcprelay.c
Normal file
339
networking/udhcp/dhcprelay.c
Normal file
@ -0,0 +1,339 @@
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/* vi: set sw=4 ts=4: */
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/* Port to Busybox Copyright (C) 2006 Jesse Dutton <jessedutton@gmail.com>
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*
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* Licensed under GPL v2, see file LICENSE in this tarball for details.
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*
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* DHCP Relay for 'DHCPv4 Configuration of IPSec Tunnel Mode' support
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* Copyright (C) 2002 Mario Strasser <mast@gmx.net>,
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* Zuercher Hochschule Winterthur,
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* Netbeat AG
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* Upstream has GPL v2 or later
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*/
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#include "common.h"
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#include "dhcpd.h"
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#include "options.h"
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/* constants */
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#define SELECT_TIMEOUT 5 /* select timeout in sec. */
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#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */
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#define MAX_INTERFACES 9
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/* This list holds information about clients. The xid_* functions manipulate this list. */
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struct xid_item {
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u_int32_t xid;
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struct sockaddr_in ip;
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int client;
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time_t timestamp;
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struct xid_item *next;
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} dhcprelay_xid_list = {0, {0}, 0, 0, NULL};
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static struct xid_item * xid_add(u_int32_t xid, struct sockaddr_in *ip, int client)
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{
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struct xid_item *item;
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/* create new xid entry */
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item = xmalloc(sizeof(struct xid_item));
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/* add xid entry */
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item->ip = *ip;
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item->xid = xid;
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item->client = client;
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item->timestamp = time(NULL);
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item->next = dhcprelay_xid_list.next;
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dhcprelay_xid_list.next = item;
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return item;
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}
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static void xid_expire(void)
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{
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struct xid_item *item = dhcprelay_xid_list.next;
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struct xid_item *last = &dhcprelay_xid_list;
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time_t current_time = time(NULL);
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while (item != NULL) {
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if ((current_time-item->timestamp) > MAX_LIFETIME) {
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last->next = item->next;
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free(item);
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item = last->next;
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} else {
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last = item;
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item = item->next;
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}
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}
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}
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static struct xid_item * xid_find(u_int32_t xid)
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{
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struct xid_item *item = dhcprelay_xid_list.next;
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while (item != NULL) {
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if (item->xid == xid) {
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return item;
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}
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item = item->next;
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}
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return NULL;
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}
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static void xid_del(u_int32_t xid)
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{
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struct xid_item *item = dhcprelay_xid_list.next;
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struct xid_item *last = &dhcprelay_xid_list;
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while (item != NULL) {
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if (item->xid == xid) {
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last->next = item->next;
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free(item);
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item = last->next;
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} else {
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last = item;
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item = item->next;
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}
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}
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}
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/**
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* get_dhcp_packet_type - gets the message type of a dhcp packet
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* p - pointer to the dhcp packet
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* returns the message type on success, -1 otherwise
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*/
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static int get_dhcp_packet_type(struct dhcpMessage *p)
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{
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u_char *op;
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/* it must be either a BOOTREQUEST or a BOOTREPLY */
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if (p->op != BOOTREQUEST && p->op != BOOTREPLY)
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return -1;
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/* get message type option */
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op = get_option(p, DHCP_MESSAGE_TYPE);
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if (op != NULL)
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return op[0];
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return -1;
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}
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/**
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* signal_handler - handles signals ;-)
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* sig - sent signal
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*/
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static int dhcprelay_stopflag;
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static void dhcprelay_signal_handler(int sig)
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{
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dhcprelay_stopflag = 1;
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}
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/**
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* get_client_devices - parses the devices list
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* dev_list - comma separated list of devices
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* returns array
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*/
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static char ** get_client_devices(char *dev_list, int *client_number)
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{
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char *s, *list, **client_dev;
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int i, cn=1;
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/* copy list */
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list = xstrdup(dev_list);
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if (list == NULL) return NULL;
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/* get number of items */
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for (s = dev_list; *s; s++) if (*s == ',')
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cn++;
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client_dev = xzalloc(cn * sizeof(*client_dev));
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/* parse list */
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s = strtok(list, ",");
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i = 0;
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while (s != NULL) {
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client_dev[i++] = xstrdup(s);
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s = strtok(NULL, ",");
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}
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/* free copy and exit */
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free(list);
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*client_number = cn;
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return client_dev;
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}
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/* Creates listen sockets (in fds) and returns the number allocated. */
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static int init_sockets(char **client, int num_clients,
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char *server, int *fds, int *max_socket)
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{
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int i;
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// talk to real server on bootps
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fds[0] = listen_socket(htonl(INADDR_ANY), 67, server);
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if (fds[0] < 0) return -1;
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*max_socket = fds[0];
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// array starts at 1 since server is 0
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num_clients++;
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for (i=1; i < num_clients; i++) {
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// listen for clients on bootps
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fds[i] = listen_socket(htonl(INADDR_ANY), 67, client[i-1]);
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if (fds[i] < 0) return -1;
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if (fds[i] > *max_socket) *max_socket = fds[i];
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}
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return i;
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}
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/**
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* pass_on() - forwards dhcp packets from client to server
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* p - packet to send
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* client - number of the client
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*/
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static void pass_on(struct dhcpMessage *p, int packet_len, int client, int *fds,
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struct sockaddr_in *client_addr, struct sockaddr_in *server_addr)
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{
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int res, type;
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struct xid_item *item;
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/* check packet_type */
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type = get_dhcp_packet_type(p);
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if (type != DHCPDISCOVER && type != DHCPREQUEST
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&& type != DHCPDECLINE && type != DHCPRELEASE
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&& type != DHCPINFORM
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) {
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return;
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}
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/* create new xid entry */
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item = xid_add(p->xid, client_addr, client);
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/* forward request to LAN (server) */
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res = sendto(fds[0], p, packet_len, 0, (struct sockaddr*)server_addr,
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sizeof(struct sockaddr_in));
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if (res != packet_len) {
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bb_perror_msg("pass_on");
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return;
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}
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}
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/**
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* pass_back() - forwards dhcp packets from server to client
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* p - packet to send
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*/
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static void pass_back(struct dhcpMessage *p, int packet_len, int *fds)
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{
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int res, type;
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struct xid_item *item;
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/* check xid */
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item = xid_find(p->xid);
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if (!item) {
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return;
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}
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/* check packet type */
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type = get_dhcp_packet_type(p);
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if (type != DHCPOFFER && type != DHCPACK && type != DHCPNAK) {
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return;
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}
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if (item->ip.sin_addr.s_addr == htonl(INADDR_ANY))
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item->ip.sin_addr.s_addr = htonl(INADDR_BROADCAST);
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if (item->client > MAX_INTERFACES)
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return;
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res = sendto(fds[item->client], p, packet_len, 0, (struct sockaddr*)(&item->ip),
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sizeof(item->ip));
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if (res != packet_len) {
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bb_perror_msg("pass_back");
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return;
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}
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/* remove xid entry */
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xid_del(p->xid);
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}
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static void dhcprelay_loop(int *fds, int num_sockets, int max_socket, char **clients,
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struct sockaddr_in *server_addr, uint32_t gw_ip)
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{
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struct dhcpMessage dhcp_msg;
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fd_set rfds;
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size_t packlen, addr_size;
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struct sockaddr_in client_addr;
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struct timeval tv;
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int i;
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while (!dhcprelay_stopflag) {
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FD_ZERO(&rfds);
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for (i = 0; i < num_sockets; i++)
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FD_SET(fds[i], &rfds);
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tv.tv_sec = SELECT_TIMEOUT;
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tv.tv_usec = 0;
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if (select(max_socket + 1, &rfds, NULL, NULL, &tv) > 0) {
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/* server */
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if (FD_ISSET(fds[0], &rfds)) {
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packlen = udhcp_get_packet(&dhcp_msg, fds[0]);
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if (packlen > 0) {
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pass_back(&dhcp_msg, packlen, fds);
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}
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}
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for (i = 1; i < num_sockets; i++) {
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/* clients */
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if (!FD_ISSET(fds[i], &rfds))
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continue;
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addr_size = sizeof(struct sockaddr_in);
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packlen = recvfrom(fds[i], &dhcp_msg, sizeof(dhcp_msg), 0,
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(struct sockaddr *)(&client_addr), &addr_size);
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if (packlen <= 0)
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continue;
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if (read_interface(clients[i-1], NULL, &dhcp_msg.giaddr, NULL) < 0)
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dhcp_msg.giaddr = gw_ip;
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pass_on(&dhcp_msg, packlen, i, fds, &client_addr, server_addr);
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}
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}
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xid_expire();
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}
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}
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int dhcprelay_main(int argc, char **argv)
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{
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int i, num_sockets, max_socket, fds[MAX_INTERFACES];
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uint32_t gw_ip;
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char **clients;
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struct sockaddr_in server_addr;
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server_addr.sin_family = AF_INET;
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server_addr.sin_port = htons(67);
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if (argc == 4) {
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if (!inet_aton(argv[3], &server_addr.sin_addr))
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bb_perror_msg_and_die("didn't grok server");
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} else if (argc == 3) {
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server_addr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
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} else {
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bb_show_usage();
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}
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clients = get_client_devices(argv[1], &num_sockets);
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if (!clients) return 0;
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signal(SIGTERM, dhcprelay_signal_handler);
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signal(SIGQUIT, dhcprelay_signal_handler);
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signal(SIGINT, dhcprelay_signal_handler);
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num_sockets = init_sockets(clients, num_sockets, argv[2], fds, &max_socket);
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if (num_sockets == -1)
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bb_perror_msg_and_die("init_sockets() failed");
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if (read_interface(argv[2], NULL, &gw_ip, NULL) == -1)
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return 1;
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dhcprelay_loop(fds, num_sockets, max_socket, clients, &server_addr, gw_ip);
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if (ENABLE_FEATURE_CLEAN_UP) {
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for (i = 0; i < num_sockets; i++) {
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close(fds[i]);
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free(clients[i]);
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}
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}
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return 0;
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}
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@ -63,23 +63,27 @@ int read_interface(char *interface, int *ifindex, uint32_t *addr, uint8_t *arp)
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DEBUG("%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
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}
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if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
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bb_perror_msg("SIOCGIFINDEX failed");
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close(fd);
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return -1;
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if (ifindex) {
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if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
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bb_perror_msg("SIOCGIFINDEX failed");
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close(fd);
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return -1;
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}
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DEBUG("adapter index %d", ifr.ifr_ifindex);
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*ifindex = ifr.ifr_ifindex;
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}
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DEBUG("adapter index %d", ifr.ifr_ifindex);
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*ifindex = ifr.ifr_ifindex;
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if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) {
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bb_perror_msg("SIOCGIFHWADDR failed");
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close(fd);
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return -1;
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if (arp) {
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if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) {
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bb_perror_msg("SIOCGIFHWADDR failed");
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close(fd);
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return -1;
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}
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memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
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DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
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arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
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}
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memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
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DEBUG("adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
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arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
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return 0;
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}
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|
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Reference in New Issue
Block a user