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;
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;
static uint8_t *host = NULL; //+Wilson03232006
unsigned int len = 0; //+Wilson03232006
uint32_t static_lease_ip;
memset(&server_config, 0, sizeof(struct server_config_t));
read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]);
/* 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;
DBG_PRINT(printf("[dhcpd]server ip = %d\n", htonl(server_config.server));)
void
db_startup(void)
{
int db_fd;
/* open lease file. once we dropped privs it has to stay open */
db_fd = open(path_dhcpd_db, O_WRONLY|O_CREAT, 0640);
if (db_fd == -1)
error("Can't create new lease file: %m");
if ((db_file = fdopen(db_fd, "w")) == NULL)
error("Can't fdopen new lease file!");
/* Read in the existing lease file... */
read_leases();
time(&write_time);
new_lease_file();
}
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;
}
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;
}
int main(int argc, char *argv[])
#endif
{
fd_set rfds;
struct timeval tv;
int server_socket = -1;
int bytes, retval;
struct dhcpMessage packet;
unsigned char *state;
unsigned char *server_id, *requested, *hostname;
u_int32_t server_id_align, requested_align;
unsigned long timeout_end;
struct option_set *option;
struct dhcpOfferedAddr *lease;
int pid_fd;
int max_sock;
int sig;
/* DD-WRT (belanger) : ignore signals until we're ready */
signal(SIGUSR1, SIG_IGN);
signal(SIGUSR2, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGTERM, SIG_IGN);
OPEN_LOG("udhcpd");
LOG(LOG_INFO, "udhcp server (v%s) started", VERSION);
memset(&server_config, 0, sizeof(struct server_config_t));
if (argc < 2)
read_config(DHCPD_CONF_FILE);
else
read_config(argv[1]);
pid_fd = pidfile_acquire(server_config.pidfile);
pidfile_write_release(pid_fd);
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;
leases = malloc(sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
memset(leases, 0, sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
read_leases(server_config.lease_file);
read_statics(server_config.statics_file);
/* DD-WRT (belanger) : write leases now */
write_leases();
if (read_interface(server_config.interface, &server_config.ifindex,
&server_config.server, server_config.arp) < 0)
exit_server(1);
#ifndef DEBUGGING
pid_fd = pidfile_acquire(server_config.pidfile); /* hold lock during fork. */
if (daemon(0, 0) == -1) {
perror("fork");
exit_server(1);
}
pidfile_write_release(pid_fd);
#endif
socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
signal(SIGUSR1, signal_handler);
signal(SIGUSR2, signal_handler);
signal(SIGTERM, signal_handler);
signal(SIGHUP, signal_handler);
timeout_end = get_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, %s", strerror(errno));
exit_server(0);
}
FD_ZERO(&rfds);
FD_SET(server_socket, &rfds);
FD_SET(signal_pipe[0], &rfds);
if (server_config.auto_time) {
tv.tv_sec = timeout_end - get_time(0);
tv.tv_usec = 0;
}
if (!server_config.auto_time || tv.tv_sec > 0) {
max_sock = server_socket > signal_pipe[0] ? server_socket : signal_pipe[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 = get_time(0) + server_config.auto_time;
continue;
}
else if (retval < 0 && errno != EINTR) {
DEBUG(LOG_INFO, "error on select");
continue;
}
if (FD_ISSET(signal_pipe[0], &rfds)) {
if (read(signal_pipe[0], &sig, sizeof(sig)) < 0)
continue; /* probably just EINTR */
switch (sig) {
case SIGUSR1:
LOG(LOG_INFO, "Received a SIGUSR1");
write_leases();
/* why not just reset the timeout, eh */
timeout_end = get_time(0) + server_config.auto_time;
continue;
case SIGUSR2:
LOG(LOG_INFO, "Received a SIGUSR2");
delete_leases();
continue;
case SIGHUP:
LOG(LOG_INFO, "Received a SIGHUP");
read_leases(server_config.lease_file);
read_statics(server_config.statics_file);
continue;
case SIGTERM:
LOG(LOG_INFO, "Received a SIGTERM");
exit_server(0);
}
}
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, %s, reopening socket", strerror(errno));
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;
}
hostname = get_option(&packet, DHCP_HOST_NAME);
/* ADDME: look for a static lease */
/* If a hostname is supplied, and that hostname is a static lease, and that
static lease has an FF:FF:FF:FF:FF:FF MAC address, then use that entry. */
if ( NULL == hostname ||
NULL == (lease = find_lease_by_hostname(hostname)) ||
(lease->expires != EXPIRES_NEVER) ||
0 != memcmp(lease->chaddr, MAC_BCAST_ADDR, strlen(MAC_BCAST_ADDR))) {
/* Otherwise, look up the table using the supplied MAC address. */
lease = find_lease_by_chaddr(packet.chaddr);
}
switch (state[0]) {
case DHCPDISCOVER:
LOG(LOG_INFO,"received DISCOVER from %02x:%02x:%02x:%02x:%02x:%02x",
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); // modify by honor
if (sendOffer(&packet, lease) < 0) {
LOG(LOG_ERR, "send OFFER failed");
}
break;
case DHCPREQUEST:
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 (requested) {
struct in_addr addr;
addr.s_addr = requested_align;
LOG(LOG_INFO, "received REQUEST for %s from %02x:%02x:%02x:%02x:%02x:%02x",
inet_ntoa(addr),
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]);
}
else {
LOG(LOG_INFO, "received REQUEST from %02x:%02x:%02x:%02x:%02x:%02x",
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]);
}
if (lease) { /*ADDME: or static 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
sendNAK(&packet); //Sveasoft - shouldn't we let them know we don't like the request?
}
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 if (!packet.ciaddr)
/* Accept an invalid request in RENEWING state,
where the ciaddr should be set, but is not. */
/* e.g. Linksys Print Server */
// sendACK(&packet, lease->yiaddr); //note: let's not support broken stuff - Sveasoft 2005-01-19
else {
/* don't know what to do!!!! */
sendNAK(&packet);
}
}
}
if (lease->expires != EXPIRES_NEVER) {
/* Don't change hostname of static leases */
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 */
sendNAK(&packet); // by honor
}
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 {
sendNAK(&packet);
}
}
else if (packet.ciaddr) {
/* RENEWING or REBINDING State */
sendNAK(&packet);
}
break;
case DHCPDECLINE:
LOG(LOG_INFO,"received DECLINE from %02x:%02x:%02x:%02x:%02x:%02x",
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); // modify by honor
if (lease && lease->expires != EXPIRES_NEVER) {
memset(lease->chaddr, 0, 16);
lease->expires = get_time(0) + server_config.decline_time;
}
break;
case DHCPRELEASE:
LOG(LOG_INFO,"received RELEASE from %02x:%02x:%02x:%02x:%02x:%02x",
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); // modify by honor
if (lease && lease->expires != EXPIRES_NEVER)
lease->expires = get_time(0);
break;
case DHCPINFORM:
LOG(LOG_INFO,"received INFORM from %02x:%02x:%02x:%02x:%02x:%02x",
packet.chaddr[0], packet.chaddr[1], packet.chaddr[2],
packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); // modify by honor
send_inform(&packet);
break;
default:
LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]);
}
}
return 0;
}
int main(int argc, char *argv[])
#endif
{
fd_set rfds;
struct timeval tv;
int server_socket = -1;
int bytes, retval;
struct dhcpMessage packet;
unsigned char *state;
unsigned char *server_id, *requested, *hostname;
u_int32_t server_id_align, requested_align;
unsigned long timeout_end;
struct option_set *option;
struct dhcpOfferedAddr *lease;
int pid_fd;
int max_sock;
int sig;
OPEN_LOG("udhcpd");
LOG(LOG_INFO, "udhcp server (v%s) started", VERSION);
memset(&server_config, 0, sizeof(struct server_config_t));
if (argc < 2)
read_config(DHCPD_CONF_FILE);
else read_config(argv[1]);
pid_fd = pidfile_acquire(server_config.pidfile);
pidfile_write_release(pid_fd);
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;
leases = malloc(sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
memset(leases, 0, sizeof(struct dhcpOfferedAddr) * server_config.max_leases);
// Added by Joey to load static lease
if (argc>=3)
{
load_leases(argv[2]);
}
read_leases(server_config.lease_file);
if (read_interface(server_config.interface, &server_config.ifindex,
&server_config.server, server_config.arp) < 0)
exit_server(1);
#ifndef DEBUGGING
pid_fd = pidfile_acquire(server_config.pidfile); /* hold lock during fork. */
if (daemon(0, 0) == -1) {
perror("fork");
exit_server(1);
}
pidfile_write_release(pid_fd);
#endif
/* ensure that stdin/stdout/stderr are never returned by pipe() */
if (fcntl(STDIN_FILENO, F_GETFL) == -1)
(void) open("/dev/null", O_RDONLY);
if (fcntl(STDOUT_FILENO, F_GETFL) == -1)
(void) open("/dev/null", O_WRONLY);
if (fcntl(STDERR_FILENO, F_GETFL) == -1)
(void) open("/dev/null", O_WRONLY);
/* setup signal handlers */
pipe(signal_pipe);
signal(SIGUSR1, signal_handler);
signal(SIGTERM, signal_handler);
timeout_end = uptime() + 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, %s", strerror(errno));
exit_server(0);
}
FD_ZERO(&rfds);
FD_SET(server_socket, &rfds);
FD_SET(signal_pipe[0], &rfds);
if (server_config.auto_time) {
tv.tv_sec = timeout_end - uptime();
tv.tv_usec = 0;
}
if (!server_config.auto_time || tv.tv_sec > 0) {
max_sock = server_socket > signal_pipe[0] ? server_socket : signal_pipe[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 = uptime() + server_config.auto_time;
continue;
} else if (retval < 0 && errno != EINTR) {
DEBUG(LOG_INFO, "error on select");
continue;
}
if (FD_ISSET(signal_pipe[0], &rfds)) {
if (read(signal_pipe[0], &sig, sizeof(sig)) < 0)
continue; /* probably just EINTR */
switch (sig) {
case SIGUSR1:
LOG(LOG_INFO, "Received a SIGUSR1");
write_leases();
/* why not just reset the timeout, eh */
timeout_end = uptime() + server_config.auto_time;
continue;
case SIGTERM:
LOG(LOG_INFO, "Received a SIGTERM");
exit_server(0);
}
}
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, %s, reopening socket", strerror(errno));
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;
}
server_id = get_option(&packet, DHCP_SERVER_ID);
if (server_id) {
memcpy(&server_id_align, server_id, 4);
if (server_id_align != server_config.server) {
/* client talks to somebody else */
DEBUG(LOG_INFO,"server ID %08x doesn't match, ignoring", ntohl(server_id_align));
continue;
}
}
/* ADDME: look for a static lease */
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);
hostname = get_option(&packet, DHCP_HOST_NAME);
if (requested) memcpy(&requested_align, requested, 4);
if (lease) { /*ADDME: or static lease */
if (server_id) {
/* SELECTING State */
if (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';
if (!is_valid_hostname(lease->hostname))
lease->hostname[0] = '\0';
} else
lease->hostname[0] = '\0';
/* what to do if we have no record of the client */
} else if (server_id) {
/* SELECTING State */
if (requested)
sendNAK(&packet);
} 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 {
sendNAK(&packet);
}
} else if (packet.ciaddr) {
/* RENEWING or REBINDING State */
sendNAK(&packet);
}
break;
case DHCPDECLINE:
DEBUG(LOG_INFO,"received DECLINE");
if (lease) {
memset(lease->chaddr, 0, 16);
lease->expires = uptime() + server_config.decline_time;
}
break;
case DHCPRELEASE:
DEBUG(LOG_INFO,"received RELEASE");
if (lease) lease->expires = uptime();
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;
}