int udhcpd_main(int argc, char **argv)
{
fd_set rfds;
struct timeval tv;
int server_socket = -1, bytes, retval, max_sock;
struct dhcpMessage packet;
uint8_t *state, *server_id, *requested;
uint32_t server_id_align, requested_align, static_lease_ip;
unsigned timeout_end;
unsigned num_ips;
unsigned opt;
struct option_set *option;
struct dhcpOfferedAddr *lease, static_lease;
opt = getopt32(argv, "fS");
argv += optind;
if (!(opt & 1)) { /* no -f */
bb_daemonize_or_rexec(0, argv);
logmode &= ~LOGMODE_STDIO;
}
if (opt & 2) { /* -S */
openlog(applet_name, LOG_PID, LOG_LOCAL0);
logmode |= LOGMODE_SYSLOG;
}
/* Would rather not do read_config before daemonization -
* otherwise NOMMU machines will parse config twice */
read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE);
/* 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("cannot create pidfile %s", pidfile); */
bb_info_msg("%s (v"BB_VER") started", applet_name);
option = find_option(server_config.options, DHCP_LEASE_TIME);
server_config.lease = LEASE_TIME;
if (option) {
memcpy(&server_config.lease, option->data + 2, 4);
server_config.lease = ntohl(server_config.lease);
}
/* Sanity check */
num_ips = server_config.end_ip - server_config.start_ip + 1;
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);
server_config.max_leases = num_ips;
}
leases = xzalloc(server_config.max_leases * sizeof(*leases));
read_leases(server_config.lease_file);
if (read_interface(server_config.interface, &server_config.ifindex,
&server_config.server, server_config.arp)) {
retval = 1;
goto ret;
}
/* Setup the signal pipe */
udhcp_sp_setup();
timeout_end = monotonic_sec() + server_config.auto_time;
while (1) { /* loop until universe collapses */
if (server_socket < 0) {
server_socket = listen_socket(/*INADDR_ANY,*/ SERVER_PORT,
server_config.interface);
}
max_sock = udhcp_sp_fd_set(&rfds, server_socket);
if (server_config.auto_time) {
tv.tv_sec = timeout_end - monotonic_sec();
tv.tv_usec = 0;
}
retval = 0;
if (!server_config.auto_time || tv.tv_sec > 0) {
retval = select(max_sock + 1, &rfds, NULL, NULL,
server_config.auto_time ? &tv : NULL);
}
if (retval == 0) {
write_leases();
timeout_end = monotonic_sec() + server_config.auto_time;
continue;
}
if (retval < 0 && errno != EINTR) {
DEBUG("error on select");
continue;
}
switch (udhcp_sp_read(&rfds)) {
case SIGUSR1:
bb_info_msg("Received a SIGUSR1");
write_leases();
/* why not just reset the timeout, eh */
timeout_end = monotonic_sec() + server_config.auto_time;
continue;
case SIGTERM:
bb_info_msg("Received a SIGTERM");
goto ret0;
case 0: break; /* no signal */
default: continue; /* signal or error (probably EINTR) */
}
bytes = udhcp_recv_packet(&packet, server_socket); /* this waits for a packet - idle */
if (bytes < 0) {
if (bytes == -1 && errno != EINTR) {
DEBUG("error on read, %s, reopening socket", strerror(errno));
close(server_socket);
server_socket = -1;
}
continue;
}
state = get_option(&packet, DHCP_MESSAGE_TYPE);
if (state == NULL) {
bb_error_msg("cannot get option from packet, ignoring");
continue;
}
/* Look for a static lease */
static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);
if (static_lease_ip) {
bb_info_msg("Found static lease: %x", static_lease_ip);
memcpy(&static_lease.chaddr, &packet.chaddr, 16);
static_lease.yiaddr = static_lease_ip;
static_lease.expires = 0;
lease = &static_lease;
} else {
lease = find_lease_by_chaddr(packet.chaddr);
}
switch (state[0]) {
case DHCPDISCOVER:
DEBUG("Received DISCOVER");
if (sendOffer(&packet) < 0) {
bb_error_msg("send OFFER failed");
}
/* circle test Stat. add by wangpu begin */
g_offercount ++;
printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount);
memset(g_acCmd,0,sizeof(g_acCmd));
memset(g_interface,0,sizeof(g_interface));
sprintf(g_interface,"%s",server_config.interface);
sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface);
system(g_acCmd);
/* circle test Stat. add by wangpu end */
break;
case DHCPREQUEST:
DEBUG("received REQUEST");
#if 0
/* ?¡¤??2a¨º? add by wangpu begin */
g_offercount ++;
printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount);
memset(g_acCmd,0,sizeof(g_acCmd));
memset(g_interface,0,sizeof(g_interface));
sprintf(g_interface,"%s",server_config.interface);
sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface);
system(g_acCmd);
/* ?¡¤??2a¨º? add by wangpu begin */
#endif
requested = get_option(&packet, DHCP_REQUESTED_IP);
server_id = get_option(&packet, DHCP_SERVER_ID);
if (requested) memcpy(&requested_align, requested, 4);
if (server_id) memcpy(&server_id_align, server_id, 4);
if (lease) {
if (server_id) {
/* SELECTING State */
DEBUG("server_id = %08x", ntohl(server_id_align));
if (server_id_align == server_config.server && requested
&& requested_align == lease->yiaddr
) {
sendACK(&packet, lease->yiaddr);
}
} else if (requested) {
/* INIT-REBOOT State */
if (lease->yiaddr == requested_align)
sendACK(&packet, lease->yiaddr);
else
sendNAK(&packet);
} else if (lease->yiaddr == packet.ciaddr) {
/* RENEWING or REBINDING State */
sendACK(&packet, lease->yiaddr);
} else {
/* don't know what to do!!!! */
sendNAK(&packet);
}
/* what to do if we have no record of the client */
} else if (server_id) {
/* SELECTING State */
} else if (requested) {
/* INIT-REBOOT State */
lease = find_lease_by_yiaddr(requested_align);
if (lease) {
if (lease_expired(lease)) {
/* probably best if we drop this lease */
memset(lease->chaddr, 0, 16);
/* make some contention for this address */
} else
sendNAK(&packet);
} else {
uint32_t r = ntohl(requested_align);
if (r < server_config.start_ip
|| r > server_config.end_ip
) {
sendNAK(&packet);
}
/* else remain silent */
}
} else {
/* RENEWING or REBINDING State */
}
break;
case DHCPDECLINE:
DEBUG("Received DECLINE");
if (lease) {
memset(lease->chaddr, 0, 16);
lease->expires = time(0) + server_config.decline_time;
}
break;
case DHCPRELEASE:
DEBUG("Received RELEASE");
if (lease)
lease->expires = time(0);
break;
case DHCPINFORM:
DEBUG("Received INFORM");
send_inform(&packet);
break;
default:
bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]);
}
}
ret0:
retval = 0;
ret:
/*if (server_config.pidfile) - server_config.pidfile is never NULL */
remove_pidfile(server_config.pidfile);
return retval;
}
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(struct dhcpMessage *oldpacket)
{
struct dhcpMessage packet;
struct dhcpOfferedAddr *lease = NULL;
u_int32_t req_align, lease_time_align = cur_iface->lease;
char *req, *lease_time;
struct option_set *curr;
struct in_addr addr;
//For static IP lease
uint32_t static_lease_ip;
//brcm begin
char VIinfo[VENDOR_IDENTIFYING_INFO_LEN];
//brcm end
init_packet(&packet, oldpacket, DHCPOFFER);
//For static IP lease
static_lease_ip = getIpByMac(cur_iface->static_leases,
oldpacket->chaddr);
if(!static_lease_ip) {
/* the client is in our lease/offered table */
if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
if (!lease_expired(lease))
lease_time_align = lease->expires - time(0);
packet.yiaddr = lease->yiaddr;
/* Or the client has a requested ip */
} else if ((req = (char *)get_option(oldpacket, DHCP_REQUESTED_IP)) &&
/* Don't look here (ugly hackish thing to do) */
memcpy(&req_align, req, 4) &&
/* and the ip is in the lease range */
ntohl(req_align) >= ntohl(cur_iface->start) &&
ntohl(req_align) <= ntohl(cur_iface->end) &&
/* and its not already taken/offered */
((!(lease = find_lease_by_yiaddr(req_align)) ||
/* or its taken, but expired */
lease_expired(lease)))) {
packet.yiaddr = req_align;
/* otherwise, find a free IP */
} else {
packet.yiaddr = find_address(0);
/* try for an expired lease */
if (!packet.yiaddr) packet.yiaddr = find_address(1);
}
if(!packet.yiaddr) {
LOG(LOG_WARNING, "no IP addresses to give -- "
"OFFER abandoned");
return -1;
}
if (!add_lease(packet.chaddr, packet.yiaddr,
server_config.offer_time)) {
LOG(LOG_WARNING, "lease pool is full -- "
"OFFER abandoned");
return -1;
}
if ((lease_time = (char *)get_option(oldpacket, DHCP_LEASE_TIME))) {
memcpy(&lease_time_align, lease_time, 4);
lease_time_align = ntohl(lease_time_align);
if (lease_time_align > cur_iface->lease)
lease_time_align = cur_iface->lease;
}
/* Make sure we aren't just using the lease time from the
* previous offer */
if (lease_time_align < server_config.min_lease)
lease_time_align = cur_iface->lease;
//<< jojopo : wifi leasetime 300 seconds , 2015/12/25
if(isHostFromWireless(packet.chaddr))
lease_time_align = 300;
//>> jojopo : end
} else {
/* It is a static lease... use it */
packet.yiaddr = static_lease_ip;
}
add_simple_option(packet.options, DHCP_LEASE_TIME, lease_time_align);
curr = cur_iface->options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_option_string(packet.options, curr->data);
curr = curr->next;
}
add_bootp_options(&packet);
//brcm begin
/* if DHCPDISCOVER from client has device identity, send back gateway identity */
if ((req = (char *)get_option(oldpacket, DHCP_VENDOR_IDENTIFYING))) {
if (createVIoption(VENDOR_IDENTIFYING_FOR_GATEWAY, VIinfo) != -1)
add_option_string(packet.options, (unsigned char *)VIinfo);
}
//brcm end
addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, 0);
}
/* send a DHCP OFFER to a DHCP DISCOVER */
int send_offer(struct dhcpMessage *oldpacket)
{
struct dhcpMessage packet;
struct dhcpOfferedAddr *lease = NULL;
uint32_t req_align, lease_time_align = server_config.lease;
uint8_t *req, *lease_time;
struct option_set *curr;
struct in_addr addr;
uint32_t static_lease_ip;
init_packet(&packet, oldpacket, DHCPOFFER);
static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);
/* ADDME: if static, short circuit */
if (!static_lease_ip) {
/* the client is in our lease/offered table */
lease = find_lease_by_chaddr(oldpacket->chaddr);
if (lease) {
if (!lease_expired(lease))
lease_time_align = lease->expires - time(0);
packet.yiaddr = lease->yiaddr;
/* Or the client has a requested ip */
} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP))
/* Don't look here (ugly hackish thing to do) */
&& memcpy(&req_align, req, 4)
/* and the ip is in the lease range */
&& ntohl(req_align) >= server_config.start_ip
&& ntohl(req_align) <= server_config.end_ip
&& !static_lease_ip /* Check that its not a static lease */
/* and is not already taken/offered */
&& (!(lease = find_lease_by_yiaddr(req_align))
/* or its taken, but expired */ /* ADDME: or maybe in here */
|| lease_expired(lease))
) {
packet.yiaddr = req_align; /* FIXME: oh my, is there a host using this IP? */
/* otherwise, find a free IP */
} else {
/* Is it a static lease? (No, because find_address skips static lease) */
packet.yiaddr = find_address(0);
/* try for an expired lease */
if (!packet.yiaddr)
packet.yiaddr = find_address(1);
}
if (!packet.yiaddr) {
bb_error_msg("no IP addresses to give - OFFER abandoned");
return -1;
}
if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time)) {
bb_error_msg("lease pool is full - OFFER abandoned");
return -1;
}
lease_time = get_option(oldpacket, DHCP_LEASE_TIME);
if (lease_time) {
memcpy(&lease_time_align, lease_time, 4);
lease_time_align = ntohl(lease_time_align);
if (lease_time_align > server_config.lease)
lease_time_align = server_config.lease;
}
/* Make sure we aren't just using the lease time from the previous offer */
if (lease_time_align < server_config.min_lease)
lease_time_align = server_config.lease;
/* ADDME: end of short circuit */
} else {
/* It is a static lease... use it */
packet.yiaddr = static_lease_ip;
}
add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_align));
curr = server_config.options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_option_string(packet.options, curr->data);
curr = curr->next;
}
add_bootp_options(&packet);
addr.s_addr = packet.yiaddr;
bb_info_msg("Sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, 0);
}
int main(int argc, char *argv[])
#endif
{
fd_set rfds;
struct timeval tv;
int server_socket = -1;
int bytes, retval;
struct dhcpMessage packet;
uint8_t *state;
uint8_t *server_id, *requested;
uint8_t *hostname;
uint32_t server_id_align, requested_align;
unsigned long timeout_end;
struct option_set *option;
struct dhcpOfferedAddr *lease;
struct dhcpOfferedAddr static_lease;
int max_sock;
unsigned long num_ips;
uint32_t static_lease_ip;
memset(&server_config, 0, sizeof(struct server_config_t));
read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
read_config_static_leases(DHCPD_STATIC_LEASES_FILE);
/* Start the log, sanitize fd's, and write a pid file */
start_log_and_pid("udhcpd", server_config.pidfile);
if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) {
memcpy(&server_config.lease, option->data + 2, 4);
server_config.lease = ntohl(server_config.lease);
}
else server_config.lease = LEASE_TIME;
/* Sanity check */
num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1;
if (server_config.max_leases > num_ips) {
// LOG(LOG_ERR, "max_leases value (%lu) not sane, "
// "setting to %lu instead",
// server_config.max_leases, num_ips);
server_config.max_leases = num_ips;
}
leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr));
read_leases(server_config.lease_file);
if (read_interface(server_config.interface, &server_config.ifindex,
&server_config.server, server_config.arp) < 0)
return 1;
#ifndef UDHCP_DEBUG
background(server_config.pidfile); /* hold lock during fork. */
#endif
/* Setup the signal pipe */
udhcp_sp_setup();
timeout_end = time(0) + server_config.auto_time;
while(1) { /* loop until universe collapses */
if (server_socket < 0)
if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) {
LOG(LOG_ERR, "FATAL: couldn't create server socket, %m");
return 2;
}
max_sock = udhcp_sp_fd_set(&rfds, server_socket);
if (server_config.auto_time) {
tv.tv_sec = timeout_end - time(0);
tv.tv_usec = 0;
}
if (!server_config.auto_time || tv.tv_sec > 0) {
retval = select(max_sock + 1, &rfds, NULL, NULL,
server_config.auto_time ? &tv : NULL);
} else retval = 0; /* If we already timed out, fall through */
if (retval == 0) {
write_leases();
timeout_end = time(0) + server_config.auto_time;
continue;
} else if (retval < 0 && errno != EINTR) {
DEBUG(LOG_INFO, "error on select");
continue;
}
switch (udhcp_sp_read(&rfds)) {
case SIGUSR1:
LOG(LOG_INFO, "Received a SIGUSR1");
write_leases();
/* why not just reset the timeout, eh */
timeout_end = time(0) + server_config.auto_time;
continue;
case SIGTERM:
LOG(LOG_INFO, "Received a SIGTERM");
return 0;
case 0: break; /* no signal */
default: continue; /* signal or error (probably EINTR) */
}
if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */
if (bytes == -1 && errno != EINTR) {
DEBUG(LOG_INFO, "error on read, %m, reopening socket");
close(server_socket);
server_socket = -1;
}
continue;
}
if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
DEBUG(LOG_ERR, "couldn't get option from packet, ignoring");
continue;
}
/* Look for a static lease */
static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr);
if(static_lease_ip)
{
printf("Found static lease: %x\n", static_lease_ip);
memcpy(&static_lease.chaddr, &packet.chaddr, 16);
static_lease.yiaddr = static_lease_ip;
static_lease.expires = 0;
lease = &static_lease;
}
else
{
lease = find_lease_by_chaddr(packet.chaddr);
}
switch (state[0]) {
case DHCPDISCOVER:
DEBUG(LOG_INFO,"received DISCOVER");
if (sendOffer(&packet) < 0) {
LOG(LOG_ERR, "send OFFER failed");
}
break;
case DHCPREQUEST:
DEBUG(LOG_INFO, "received REQUEST");
requested = get_option(&packet, DHCP_REQUESTED_IP);
server_id = get_option(&packet, DHCP_SERVER_ID);
hostname = get_option(&packet, DHCP_HOST_NAME);
if (requested) memcpy(&requested_align, requested, 4);
if (server_id) memcpy(&server_id_align, server_id, 4);
if (lease) {
if (server_id) {
/* SELECTING State */
DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align));
if (server_id_align == server_config.server && requested &&
requested_align == lease->yiaddr) {
sendACK(&packet, lease->yiaddr);
}
} else {
if (requested) {
/* INIT-REBOOT State */
if (lease->yiaddr == requested_align)
sendACK(&packet, lease->yiaddr);
else sendNAK(&packet);
} else {
/* RENEWING or REBINDING State */
if (lease->yiaddr == packet.ciaddr)
sendACK(&packet, lease->yiaddr);
else {
/* don't know what to do!!!! */
sendNAK(&packet);
}
}
}
if (hostname) {
bytes = hostname[-1];
if (bytes >= (int) sizeof(lease->hostname))
bytes = sizeof(lease->hostname) - 1;
strncpy(lease->hostname, hostname, bytes);
lease->hostname[bytes] = '\0';
} else
lease->hostname[0] = '\0';
/* what to do if we have no record of the client */
} else if (server_id) {
/* SELECTING State */
} else if (requested) {
/* INIT-REBOOT State */
if ((lease = find_lease_by_yiaddr(requested_align))) {
if (lease_expired(lease)) {
/* probably best if we drop this lease */
memset(lease->chaddr, 0, 16);
/* make some contention for this address */
} else sendNAK(&packet);
} else if (requested_align < server_config.start ||
requested_align > server_config.end) {
sendNAK(&packet);
} /* else remain silent */
} else {
/* RENEWING or REBINDING State */
}
break;
case DHCPDECLINE:
DEBUG(LOG_INFO,"received DECLINE");
if (lease) {
memset(lease->chaddr, 0, 16);
lease->expires = time(0) + server_config.decline_time;
}
break;
case DHCPRELEASE:
DEBUG(LOG_INFO,"received RELEASE");
if (lease) lease->expires = time(0);
break;
case DHCPINFORM:
DEBUG(LOG_INFO,"received INFORM");
send_inform(&packet);
break;
default:
LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
}
}
return 0;
}
/* send a DHCP OFFER to a DHCP DISCOVER */
int sendOffer(struct dhcpMessage *oldpacket)
{
struct dhcpMessage packet;
struct dhcpOfferedAddr *lease = NULL;
u_int32_t req_align, lease_time_align = server_config.lease;
char *req, *lease_time;
struct option_set *curr;
struct in_addr addr;
char *hostname;
char hostname_copy[64];
uint32_t static_lease_ip;
init_packet(&packet, oldpacket, DHCPOFFER);
static_lease_ip = getIpByMac(server_config.static_leases, oldpacket->chaddr);
/* ADDME: if static, short circuit */
if(!static_lease_ip)
{
/* the client is in our lease/offered table */
if ((lease = find_lease_by_chaddr(oldpacket->chaddr))) {
if (!lease_expired(lease))
lease_time_align = lease->expires - time(0);
packet.yiaddr = lease->yiaddr;
/* Or the client has a requested ip */
} else if ((req = get_option(oldpacket, DHCP_REQUESTED_IP)) &&
/* Don't look here (ugly hackish thing to do) */
memcpy(&req_align, req, 4) &&
/* and the ip is in the lease range */
ntohl(req_align) >= ntohl(server_config.start) &&
ntohl(req_align) <= ntohl(server_config.end) &&
!static_lease_ip && /* Check that its not a static lease */
/* and its not already taken/offered */
((!(lease = find_lease_by_yiaddr(req_align)) ||
/* or its taken, but expired */
lease_expired(lease)))) {
packet.yiaddr = req_align;
/* otherwise, find a free IP */
} else {
packet.yiaddr = find_address(0);
/* try for an expired lease */
if (!packet.yiaddr) packet.yiaddr = find_address(1);
}
if(!packet.yiaddr) {
LOG(LOG_WARNING, "no IP addresses to give -- OFFER abandoned");
return -1;
}
hostname = get_option(oldpacket, DHCP_HOST_NAME);
memset(hostname_copy, 0, sizeof(hostname_copy));
if (hostname) {
memcpy(hostname_copy, hostname, hostname[-1]);
}
if (!add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time, hostname_copy)) {
LOG(LOG_WARNING, "lease pool is full -- OFFER abandoned");
return -1;
}
if ((lease_time = get_option(oldpacket, DHCP_LEASE_TIME))) {
memcpy(&lease_time_align, lease_time, 4);
lease_time_align = ntohl(lease_time_align);
if (lease_time_align > server_config.lease)
lease_time_align = server_config.lease;
}
/* Make sure we aren't just using the lease time from the previous offer */
if (lease_time_align < server_config.min_lease)
lease_time_align = server_config.lease;
}
/* ADDME: end of short circuit */
else
{
/* It is a static lease... use it */
packet.yiaddr = static_lease_ip;
}
add_simple_option(packet.options, DHCP_LEASE_TIME, lease_time_align);
curr = server_config.options;
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
add_option_string(packet.options, curr->data);
curr = curr->next;
}
add_bootp_options(&packet);
addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "sending OFFER of %s", inet_ntoa(addr));
return send_packet(&packet, 0);
}
