busybox/networking/udhcp/dhcpd.c

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/* vi: set sw=4 ts=4: */
/*
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* udhcp Server
* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
* Chris Trew <ctrew@moreton.com.au>
*
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
#include <syslog.h>
#include "common.h"
#include "dhcpc.h"
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#include "dhcpd.h"
#include "options.h"
/* send a packet to gateway_nip using the kernel ip stack */
static int send_packet_to_relay(struct dhcp_packet *dhcp_pkt)
{
log1("Forwarding packet to relay");
return udhcp_send_kernel_packet(dhcp_pkt,
server_config.server_nip, SERVER_PORT,
dhcp_pkt->gateway_nip, SERVER_PORT);
}
/* send a packet to a specific mac address and ip address by creating our own ip packet */
static int send_packet_to_client(struct dhcp_packet *dhcp_pkt, int force_broadcast)
{
const uint8_t *chaddr;
uint32_t ciaddr;
// Was:
//if (force_broadcast) { /* broadcast */ }
//else if (dhcp_pkt->ciaddr) { /* unicast to dhcp_pkt->ciaddr */ }
//else if (dhcp_pkt->flags & htons(BROADCAST_FLAG)) { /* broadcast */ }
//else { /* unicast to dhcp_pkt->yiaddr */ }
// But this is wrong: yiaddr is _our_ idea what client's IP is
// (for example, from lease file). Client may not know that,
// and may not have UDP socket listening on that IP!
// We should never unicast to dhcp_pkt->yiaddr!
// dhcp_pkt->ciaddr, OTOH, comes from client's request packet,
// and can be used.
if (force_broadcast
|| (dhcp_pkt->flags & htons(BROADCAST_FLAG))
|| !dhcp_pkt->ciaddr
) {
log1("Broadcasting packet to client");
ciaddr = INADDR_BROADCAST;
chaddr = MAC_BCAST_ADDR;
} else {
log1("Unicasting packet to client ciaddr");
ciaddr = dhcp_pkt->ciaddr;
chaddr = dhcp_pkt->chaddr;
}
return udhcp_send_raw_packet(dhcp_pkt,
/*src*/ server_config.server_nip, SERVER_PORT,
/*dst*/ ciaddr, CLIENT_PORT, chaddr,
server_config.ifindex);
}
/* Send the dhcp packet.
* If force broadcast is set, the packet will be broadcast.
*/
static int send_packet(struct dhcp_packet *dhcp_pkt, int force_broadcast)
{
if (dhcp_pkt->gateway_nip)
return send_packet_to_relay(dhcp_pkt);
return send_packet_to_client(dhcp_pkt, force_broadcast);
}
static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacket, char type)
{
udhcp_init_header(packet, type);
packet->xid = oldpacket->xid;
memcpy(packet->chaddr, oldpacket->chaddr, sizeof(oldpacket->chaddr));
packet->flags = oldpacket->flags;
packet->gateway_nip = oldpacket->gateway_nip;
packet->ciaddr = oldpacket->ciaddr;
add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
}
/* Fill options field, siaddr_nip, and sname and boot_file fields.
* TODO: teach this code to use overload option.
*/
static void add_server_options(struct dhcp_packet *packet)
{
struct option_set *curr = server_config.options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_option_string(packet->options, curr->data);
curr = curr->next;
}
packet->siaddr_nip = server_config.siaddr_nip;
if (server_config.sname)
strncpy((char*)packet->sname, server_config.sname, sizeof(packet->sname) - 1);
if (server_config.boot_file)
strncpy((char*)packet->file, server_config.boot_file, sizeof(packet->file) - 1);
}
static uint32_t select_lease_time(struct dhcp_packet *packet)
{
uint32_t lease_time_sec = server_config.max_lease_sec;
uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME);
if (lease_time_opt) {
move_from_unaligned32(lease_time_sec, lease_time_opt);
lease_time_sec = ntohl(lease_time_sec);
if (lease_time_sec > server_config.max_lease_sec)
lease_time_sec = server_config.max_lease_sec;
if (lease_time_sec < server_config.min_lease_sec)
lease_time_sec = server_config.min_lease_sec;
}
return lease_time_sec;
}
/* send a DHCP OFFER to a DHCP DISCOVER */
static int send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip, struct dyn_lease *lease)
{
struct dhcp_packet packet;
uint32_t lease_time_sec = server_config.max_lease_sec;
const char *p_host_name;
struct in_addr addr;
init_packet(&packet, oldpacket, DHCPOFFER);
/* ADDME: if static, short circuit */
if (!static_lease_nip) {
uint32_t req_nip;
uint8_t *req_ip_opt;
/* The client is in our lease/offered table */
if (lease) {
packet.yiaddr = lease->lease_nip;
}
/* Or the client has requested an IP */
else if ((req_ip_opt = get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL
/* (read IP) */
&& (move_from_unaligned32(req_nip, req_ip_opt), 1)
/* and the IP is in the lease range */
&& ntohl(req_nip) >= server_config.start_ip
&& ntohl(req_nip) <= server_config.end_ip
/* and */
&& ( !(lease = find_lease_by_nip(req_nip)) /* is not already taken */
|| is_expired_lease(lease) /* or is taken, but expired */
)
) {
packet.yiaddr = req_nip;
}
/* Otherwise, find a free IP */
else {
packet.yiaddr = find_free_or_expired_nip(oldpacket->chaddr);
}
if (!packet.yiaddr) {
bb_error_msg("no IP addresses to give - OFFER abandoned");
return -1;
}
p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
if (add_lease(packet.chaddr, packet.yiaddr,
server_config.offer_time,
p_host_name,
p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
) == 0
) {
bb_error_msg("lease pool is full - OFFER abandoned");
return -1;
}
lease_time_sec = select_lease_time(oldpacket);
} else {
/* It is a static lease... use it */
packet.yiaddr = static_lease_nip;
}
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = packet.yiaddr;
bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, /*force_bcast:*/ 0);
}
static int send_NAK(struct dhcp_packet *oldpacket)
{
struct dhcp_packet packet;
init_packet(&packet, oldpacket, DHCPNAK);
log1("Sending NAK");
return send_packet(&packet, /*force_bcast:*/ 1);
}
static int send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
{
struct dhcp_packet packet;
uint32_t lease_time_sec;
struct in_addr addr;
const char *p_host_name;
init_packet(&packet, oldpacket, DHCPACK);
packet.yiaddr = yiaddr;
lease_time_sec = select_lease_time(oldpacket);
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = packet.yiaddr;
bb_info_msg("Sending ACK to %s", inet_ntoa(addr));
if (send_packet(&packet, /*force_bcast:*/ 0) < 0)
return -1;
p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME);
add_lease(packet.chaddr, packet.yiaddr,
lease_time_sec,
p_host_name,
p_host_name ? (unsigned char)p_host_name[OPT_LEN - OPT_DATA] : 0
);
if (ENABLE_FEATURE_UDHCPD_WRITE_LEASES_EARLY) {
/* rewrite the file with leases at every new acceptance */
write_leases();
}
return 0;
}
static int send_inform(struct dhcp_packet *oldpacket)
{
struct dhcp_packet packet;
init_packet(&packet, oldpacket, DHCPACK);
add_server_options(&packet);
return send_packet(&packet, /*force_bcast:*/ 0);
}
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/* globals */
struct dyn_lease *g_leases;
/* struct server_config_t server_config is in bb_common_bufsiz1 */
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int udhcpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int udhcpd_main(int argc UNUSED_PARAM, char **argv)
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{
fd_set rfds;
int server_socket = -1, retval, max_sock;
struct dhcp_packet packet;
uint8_t *state;
uint32_t static_lease_nip;
unsigned timeout_end;
unsigned num_ips;
unsigned opt;
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struct option_set *option;
struct dyn_lease *lease, fake_lease;
IF_FEATURE_UDHCP_PORT(char *str_P;)
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#if ENABLE_FEATURE_UDHCP_PORT
SERVER_PORT = 67;
CLIENT_PORT = 68;
#endif
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
opt_complementary = "vv";
#endif
opt = getopt32(argv, "fSv"
IF_FEATURE_UDHCP_PORT("P:", &str_P)
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
, &dhcp_verbose
#endif
);
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argv += optind;
if (!(opt & 1)) { /* no -f */
bb_daemonize_or_rexec(0, argv);
logmode = LOGMODE_NONE;
}
if (opt & 2) { /* -S */
openlog(applet_name, LOG_PID, LOG_DAEMON);
logmode |= LOGMODE_SYSLOG;
}
#if ENABLE_FEATURE_UDHCP_PORT
if (opt & 4) { /* -P */
SERVER_PORT = xatou16(str_P);
CLIENT_PORT = SERVER_PORT + 1;
}
#endif
/* Would rather not do read_config before daemonization -
* otherwise NOMMU machines will parse config twice */
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read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE);
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/* Make sure fd 0,1,2 are open */
bb_sanitize_stdio();
/* Equivalent of doing a fflush after every \n */
setlinebuf(stdout);
/* Create pidfile */
write_pidfile(server_config.pidfile);
/* if (!..) bb_perror_msg("can't create pidfile %s", pidfile); */
bb_info_msg("%s (v"BB_VER") started", applet_name);
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option = find_option(server_config.options, DHCP_LEASE_TIME);
server_config.max_lease_sec = LEASE_TIME;
if (option) {
move_from_unaligned32(server_config.max_lease_sec, option->data + OPT_DATA);
server_config.max_lease_sec = ntohl(server_config.max_lease_sec);
}
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/* Sanity check */
num_ips = server_config.end_ip - server_config.start_ip + 1;
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if (server_config.max_leases > num_ips) {
bb_error_msg("max_leases=%u is too big, setting to %u",
(unsigned)server_config.max_leases, num_ips);
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server_config.max_leases = num_ips;
}
g_leases = xzalloc(server_config.max_leases * sizeof(g_leases[0]));
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read_leases(server_config.lease_file);
if (udhcp_read_interface(server_config.interface,
&server_config.ifindex,
&server_config.server_nip,
server_config.server_mac)
) {
retval = 1;
goto ret;
}
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/* Setup the signal pipe */
udhcp_sp_setup();
timeout_end = monotonic_sec() + server_config.auto_time;
while (1) { /* loop until universe collapses */
int bytes;
struct timeval tv;
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if (server_socket < 0) {
server_socket = udhcp_listen_socket(/*INADDR_ANY,*/ SERVER_PORT,
server_config.interface);
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}
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max_sock = udhcp_sp_fd_set(&rfds, server_socket);
if (server_config.auto_time) {
tv.tv_sec = timeout_end - monotonic_sec();
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tv.tv_usec = 0;
}
retval = 0;
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if (!server_config.auto_time || tv.tv_sec > 0) {
retval = select(max_sock + 1, &rfds, NULL, NULL,
server_config.auto_time ? &tv : NULL);
}
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if (retval == 0) {
write_leases();
timeout_end = monotonic_sec() + server_config.auto_time;
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continue;
}
if (retval < 0 && errno != EINTR) {
log1("Error on select");
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continue;
}
switch (udhcp_sp_read(&rfds)) {
case SIGUSR1:
bb_info_msg("Received a SIGUSR1");
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write_leases();
/* why not just reset the timeout, eh */
timeout_end = monotonic_sec() + server_config.auto_time;
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continue;
case SIGTERM:
bb_info_msg("Received a SIGTERM");
goto ret0;
case 0: /* no signal: read a packet */
break;
default: /* signal or error (probably EINTR): back to select */
continue;
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}
bytes = udhcp_recv_kernel_packet(&packet, server_socket);
if (bytes < 0) {
/* bytes can also be -2 ("bad packet data") */
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if (bytes == -1 && errno != EINTR) {
log1("Read error: %s, reopening socket", strerror(errno));
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close(server_socket);
server_socket = -1;
}
continue;
}
if (packet.hlen != 6) {
bb_error_msg("MAC length != 6, ignoring packet");
continue;
}
state = get_option(&packet, DHCP_MESSAGE_TYPE);
if (state == NULL) {
bb_error_msg("no message type option, ignoring packet");
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continue;
}
/* Look for a static lease */
static_lease_nip = get_static_nip_by_mac(server_config.static_leases, &packet.chaddr);
if (static_lease_nip) {
bb_info_msg("Found static lease: %x", static_lease_nip);
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memcpy(&fake_lease.lease_mac, &packet.chaddr, 6);
fake_lease.lease_nip = static_lease_nip;
fake_lease.expires = 0;
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lease = &fake_lease;
} else {
lease = find_lease_by_mac(packet.chaddr);
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}
switch (state[0]) {
case DHCPDISCOVER:
log1("Received DISCOVER");
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if (send_offer(&packet, static_lease_nip, lease) < 0) {
bb_error_msg("send OFFER failed");
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}
break;
case DHCPREQUEST: {
uint8_t *server_id_opt, *requested_opt;
uint32_t server_id_net = server_id_net; /* for compiler */
uint32_t requested_nip = requested_nip; /* for compiler */
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log1("Received REQUEST");
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requested_opt = get_option(&packet, DHCP_REQUESTED_IP);
server_id_opt = get_option(&packet, DHCP_SERVER_ID);
if (requested_opt)
move_from_unaligned32(requested_nip, requested_opt);
if (server_id_opt)
move_from_unaligned32(server_id_net, server_id_opt);
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if (lease) {
if (server_id_opt) {
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/* SELECTING State */
if (server_id_net == server_config.server_nip
&& requested_opt
&& requested_nip == lease->lease_nip
) {
send_ACK(&packet, lease->lease_nip);
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}
} else if (requested_opt) {
/* INIT-REBOOT State */
if (lease->lease_nip == requested_nip)
send_ACK(&packet, lease->lease_nip);
else
send_NAK(&packet);
} else if (lease->lease_nip == packet.ciaddr) {
/* RENEWING or REBINDING State */
send_ACK(&packet, lease->lease_nip);
} else { /* don't know what to do!!!! */
send_NAK(&packet);
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}
/* what to do if we have no record of the client */
} else if (server_id_opt) {
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/* SELECTING State */
} else if (requested_opt) {
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/* INIT-REBOOT State */
lease = find_lease_by_nip(requested_nip);
if (lease) {
if (is_expired_lease(lease)) {
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/* probably best if we drop this lease */
memset(lease->lease_mac, 0, sizeof(lease->lease_mac));
} else {
/* make some contention for this address */
send_NAK(&packet);
}
} else {
uint32_t r = ntohl(requested_nip);
if (r < server_config.start_ip
|| r > server_config.end_ip
) {
send_NAK(&packet);
}
/* else remain silent */
}
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} else {
/* RENEWING or REBINDING State */
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}
break;
}
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case DHCPDECLINE:
log1("Received DECLINE");
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if (lease) {
memset(lease->lease_mac, 0, sizeof(lease->lease_mac));
lease->expires = time(NULL) + server_config.decline_time;
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}
break;
case DHCPRELEASE:
log1("Received RELEASE");
if (lease)
lease->expires = time(NULL);
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break;
case DHCPINFORM:
log1("Received INFORM");
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send_inform(&packet);
break;
default:
bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]);
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}
}
ret0:
retval = 0;
ret:
/*if (server_config.pidfile) - server_config.pidfile is never NULL */
remove_pidfile(server_config.pidfile);
return retval;
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}