int udhcpc_main(int argc, char *argv[])
{
uint8_t *temp, *message;
char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease = 0;
long now;
unsigned opt;
int max_fd;
int sig;
int retval;
int len;
int no_clientid = 0;
fd_set rfds;
struct timeval tv;
struct dhcpMessage packet;
struct in_addr temp_addr;
enum {
OPT_c = 1 << 0,
OPT_C = 1 << 1,
OPT_V = 1 << 2,
OPT_f = 1 << 3,
OPT_b = 1 << 4,
OPT_H = 1 << 5,
OPT_h = 1 << 6,
OPT_F = 1 << 7,
OPT_i = 1 << 8,
OPT_n = 1 << 9,
OPT_p = 1 << 10,
OPT_q = 1 << 11,
OPT_R = 1 << 12,
OPT_r = 1 << 13,
OPT_s = 1 << 14,
OPT_T = 1 << 15,
OPT_t = 1 << 16,
OPT_v = 1 << 17,
};
#if ENABLE_GETOPT_LONG
static const struct option arg_options[] = {
{ "clientid", required_argument, 0, 'c' },
{ "clientid-none", no_argument, 0, 'C' },
{ "vendorclass", required_argument, 0, 'V' },
{ "foreground", no_argument, 0, 'f' },
{ "background", no_argument, 0, 'b' },
{ "hostname", required_argument, 0, 'H' },
{ "hostname", required_argument, 0, 'h' },
{ "fqdn", required_argument, 0, 'F' },
{ "interface", required_argument, 0, 'i' },
{ "now", no_argument, 0, 'n' },
{ "pidfile", required_argument, 0, 'p' },
{ "quit", no_argument, 0, 'q' },
{ "release", no_argument, 0, 'R' },
{ "request", required_argument, 0, 'r' },
{ "script", required_argument, 0, 's' },
{ "timeout", required_argument, 0, 'T' },
{ "version", no_argument, 0, 'v' },
{ "retries", required_argument, 0, 't' },
{ 0, 0, 0, 0 }
};
#endif
/* Default options. */
client_config.interface = "eth0";
client_config.script = DEFAULT_SCRIPT;
client_config.retries = 3;
client_config.timeout = 3;
/* Parse command line */
opt_complementary = "?:c--C:C--c" // mutually exclusive
":hH:Hh"; // -h and -H are the same
#if ENABLE_GETOPT_LONG
applet_long_options = arg_options;
#endif
opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v",
&str_c, &str_V, &str_h, &str_h, &str_F,
&client_config.interface, &client_config.pidfile, &str_r,
&client_config.script, &str_T, &str_t
);
if (opt & OPT_c)
client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
if (opt & OPT_C)
no_clientid = 1;
if (opt & OPT_V)
client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
if (opt & OPT_f)
client_config.foreground = 1;
if (opt & OPT_b)
client_config.background_if_no_lease = 1;
if (opt & OPT_h)
client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0);
if (opt & OPT_F) {
client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3);
/* Flags: 0000NEOS
S: 1 => Client requests Server to update A RR in DNS as well as PTR
O: 1 => Server indicates to client that DNS has been updated regardless
E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
N: 1 => Client requests Server to not update DNS
*/
client_config.fqdn[OPT_DATA + 0] = 0x1;
/* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */
/* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */
}
// if (opt & OPT_i) client_config.interface = ...
if (opt & OPT_n)
client_config.abort_if_no_lease = 1;
// if (opt & OPT_p) client_config.pidfile = ...
if (opt & OPT_q)
client_config.quit_after_lease = 1;
if (opt & OPT_R)
client_config.release_on_quit = 1;
if (opt & OPT_r)
requested_ip = inet_addr(str_r);
// if (opt & OPT_s) client_config.script = ...
if (opt & OPT_T)
client_config.timeout = xatoi_u(str_T);
if (opt & OPT_t)
client_config.retries = xatoi_u(str_t);
if (opt & OPT_v) {
printf("version %s\n\n", BB_VER);
return 0;
}
/* Start the log, sanitize fd's, and write a pid file */
udhcp_start_log_and_pid(client_config.pidfile);
if (read_interface(client_config.interface, &client_config.ifindex,
NULL, client_config.arp) < 0)
return 1;
/* if not set, and not suppressed, setup the default client ID */
if (!client_config.clientid && !no_clientid) {
client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
client_config.clientid[OPT_DATA] = 1;
memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
}
if (!client_config.vendorclass)
client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
/* setup the signal pipe */
udhcp_sp_setup();
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
for (;;) {
tv.tv_sec = timeout - uptime();
tv.tv_usec = 0;
/* When running on a bridge, the ifindex may have changed (e.g. if
* member interfaces were added/removed or if the status of the
* bridge changed).
* Workaround: refresh it here before processing the next packet */
read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp);
if (listen_mode != LISTEN_NONE && fd < 0) {
if (listen_mode == LISTEN_KERNEL)
fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
else
fd = raw_socket(client_config.ifindex);
}
max_fd = udhcp_sp_fd_set(&rfds, fd);
if (tv.tv_sec > 0) {
DEBUG("Waiting on select...");
retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
} else retval = 0; /* If we already timed out, fall through */
now = uptime();
if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
if (!client_config.retries || (packet_num < client_config.retries)) {
if (packet_num == 0)
xid = random_xid();
/* send discover packet */
send_discover(xid, requested_ip); /* broadcast */
timeout = now + client_config.timeout;
packet_num++;
} else {
udhcp_run_script(NULL, "leasefail");
if (client_config.background_if_no_lease) {
bb_info_msg("No lease, forking to background");
client_background();
} else if (client_config.abort_if_no_lease) {
bb_info_msg("No lease, failing");
return 1;
}
/* wait to try again */
packet_num = 0;
timeout = now + 60;
}
break;
case RENEW_REQUESTED:
case REQUESTING:
if (!client_config.retries || (packet_num < client_config.retries)) {
/* send request packet */
if (state == RENEW_REQUESTED)
send_renew(xid, server_addr, requested_ip); /* unicast */
else send_selecting(xid, server_addr, requested_ip); /* broadcast */
timeout = now + ((packet_num == 2) ? 10 : 2);
packet_num++;
} else {
/* timed out, go back to init state */
if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
}
break;
case BOUND:
/* Lease is starting to run out, time to enter renewing state */
state = RENEWING;
change_mode(LISTEN_KERNEL);
DEBUG("Entering renew state");
/* fall right through */
case RENEWING:
/* Either set a new T1, or enter REBINDING state */
if ((t2 - t1) <= (lease / 14400 + 1)) {
/* timed out, enter rebinding state */
state = REBINDING;
timeout = now + (t2 - t1);
DEBUG("Entering rebinding state");
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
t1 = (t2 - t1) / 2 + t1;
timeout = t1 + start;
}
break;
case REBINDING:
/* Either set a new T2, or enter INIT state */
if ((lease - t2) <= (lease / 14400 + 1)) {
/* timed out, enter init state */
state = INIT_SELECTING;
bb_info_msg("Lease lost, entering init state");
udhcp_run_script(NULL, "deconfig");
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
} else {
/* send a request packet */
send_renew(xid, 0, requested_ip); /* broadcast */
t2 = (lease - t2) / 2 + t2;
timeout = t2 + start;
}
break;
case RELEASED:
/* yah, I know, *you* say it would never happen */
timeout = 0x7fffffff;
break;
}
} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
len = udhcp_get_packet(&packet, fd);
else len = get_raw_packet(&packet, fd);
if (len == -1 && errno != EINTR) {
DEBUG("error on read, %s, reopening socket", strerror(errno));
change_mode(listen_mode); /* just close and reopen */
}
if (len < 0) continue;
if (packet.xid != xid) {
DEBUG("Ignoring XID %lx (our xid is %lx)",
(unsigned long) packet.xid, xid);
continue;
}
/* Ignore packets that aren't for us */
if (memcmp(packet.chaddr, client_config.arp, 6)) {
DEBUG("Packet does not have our chaddr - ignoring");
continue;
}
if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
bb_error_msg("cannot get option from packet - ignoring");
continue;
}
switch (state) {
case INIT_SELECTING:
/* Must be a DHCPOFFER to one of our xid's */
if (*message == DHCPOFFER) {
temp = get_option(&packet, DHCP_SERVER_ID);
if (temp) {
/* can be misaligned, thus memcpy */
memcpy(&server_addr, temp, 4);
xid = packet.xid;
requested_ip = packet.yiaddr;
/* enter requesting state */
state = REQUESTING;
timeout = now;
packet_num = 0;
} else {
bb_error_msg("no server ID in message");
}
}
break;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case REBINDING:
if (*message == DHCPACK) {
temp = get_option(&packet, DHCP_LEASE_TIME);
if (!temp) {
bb_error_msg("no lease time with ACK, using 1 hour lease");
lease = 60 * 60;
} else {
/* can be misaligned, thus memcpy */
unsigned int lease_tmp = 0;
memcpy(&lease_tmp, temp, 4);
lease = ntohl(lease_tmp);
}
if (!arpping(packet.yiaddr,
(uint32_t) 0,
client_config.arp,
client_config.interface)
) {
bb_info_msg("Offered address is in use "
"(got ARP reply), declining");
send_decline(xid, server_addr, packet.yiaddr);
if (state != REQUESTING)
udhcp_run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
state = INIT_SELECTING;
requested_ip = 0;
timeout = now + 20;
packet_num = 0;
continue; /* back to main loop */
}
/* enter bound state */
t1 = lease / 2;
/* little fixed point for n * .875 */
t2 = (lease * 0x7) >> 3;
temp_addr.s_addr = packet.yiaddr;
bb_info_msg("Lease of %s obtained, lease time %ld",
inet_ntoa(temp_addr), lease);
start = now;
timeout = t1 + start;
requested_ip = packet.yiaddr;
udhcp_run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
state = BOUND;
change_mode(LISTEN_NONE);
if (client_config.quit_after_lease) {
if (client_config.release_on_quit)
perform_release();
return 0;
}
if (!client_config.foreground)
client_background();
} else if (*message == DHCPNAK) {
/* return to init state */
bb_info_msg("Received DHCP NAK");
udhcp_run_script(&packet, "nak");
if (state != REQUESTING)
udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
requested_ip = 0;
packet_num = 0;
change_mode(LISTEN_RAW);
sleep(3); /* avoid excessive network traffic */
}
break;
/* case BOUND, RELEASED: - ignore all packets */
}
} else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
int main(int argc, char *argv[])
#endif
{
char *temp, *message;
unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease;
fd_set rfds;
int fd, retval;
struct timeval tv;
int c, len;
struct ifreq ifr;
struct dhcpMessage packet;
struct in_addr temp_addr;
int pid_fd;
static struct option options[] = {
{"clientid", required_argument, 0, 'c'},
{"foreground", no_argument, 0, 'f'},
{"hostname", required_argument, 0, 'H'},
{"help", no_argument, 0, 'h'},
{"interface", required_argument, 0, 'i'},
{"now", no_argument, 0, 'n'},
{"pidfile", required_argument, 0, 'p'},
{"quit", no_argument, 0, 'q'},
{"request", required_argument, 0, 'r'},
{"script", required_argument, 0, 's'},
{"version", no_argument, 0, 'v'},
{"6rd", no_argument, 0, '6'},
{0, 0, 0, 0}
};
/* get options */
while (1) {
int option_index = 0;
// brcm
c = getopt_long(argc, argv, "c:fH:hi:np:qr:s:d:v:6I:D:O:S:P:", options, &option_index);
if (c == -1) break;
switch (c) {
case 'c':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.clientid) free(client_config.clientid);
client_config.clientid = malloc(len + 2);
client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
client_config.clientid[OPT_LEN] = len;
strncpy(client_config.clientid + 2, optarg, len);
break;
case 'f':
client_config.foreground = 1;
break;
case 'H':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.hostname) free(client_config.hostname);
client_config.hostname = malloc(len + 2);
client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
client_config.hostname[OPT_LEN] = len;
strncpy(client_config.hostname + 2, optarg, len);
break;
case 'h':
print_usage();
return 0;
case 'i':
client_config.interface = optarg;
// brcm
strcpy(session_path, optarg);
break;
case 'n':
client_config.abort_if_no_lease = 1;
break;
case 'p':
client_config.pidfile = optarg;
break;
case 'q':
client_config.quit_after_lease = 1;
break;
case 'r':
requested_ip = inet_addr(optarg);
break;
// brcm
case 'd':
strcpy(vendor_class_id, optarg);
en_vendor_class_id=1;
break;
case '6':
ipv6rd_opt = 1;
break;
case 's':
client_config.script = optarg;
break;
case 'v':
printf("udhcpcd, version %s\n\n", VERSION);
break;
case 'I':
strcpy(iaid, optarg);
en_client_id = 1;
break;
case 'D':
strcpy(duid, optarg);
en_client_id = 1;
break;
case 'O':
strcpy(oui_125, optarg);
en_125 = 1;
break;
case 'S':
strcpy(sn_125, optarg);
en_125 = 1;
break;
case 'P':
strcpy(prod_125, optarg);
en_125 = 1;
break;
}
}
// brcm
if (strlen(session_path) > 0) {
sprintf(status_path, "%s/%s/%s", _PATH_WAN_DIR, session_path, _PATH_MSG);
sprintf(pid_path, "%s/%s/%s", _PATH_WAN_DIR, session_path, _PATH_PID);
}
OPEN_LOG("udhcpc");
#ifdef VERBOSE
cmsLog_setLevel(LOG_LEVEL_DEBUG);
#else
cmsLog_setLevel(DEFAULT_LOG_LEVEL);
#endif
LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
cmsMsg_init(EID_DHCPC, &msgHandle);
pid_fd = pidfile_acquire(client_config.pidfile);
pidfile_write_release(pid_fd);
if ((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
strcpy(ifr.ifr_name, client_config.interface);
if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
client_config.ifindex = ifr.ifr_ifindex;
} else {
LOG(LOG_ERR, "SIOCGIFINDEX failed! %s", strerror(errno));
exit_client(1);
}
if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
memcpy(client_config.arp, ifr.ifr_hwaddr.sa_data, 6);
DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
client_config.arp[0], client_config.arp[1], client_config.arp[2],
client_config.arp[3], client_config.arp[4], client_config.arp[5]);
} else {
LOG(LOG_ERR, "SIOCGIFHWADDR failed! %s", strerror(errno));
exit_client(1);
}
} else {
LOG(LOG_ERR, "socket failed! %s", strerror(errno));
exit_client(1);
}
close(fd);
fd = -1;
/* setup signal handlers */
signal(SIGUSR1, renew_requested);
signal(SIGUSR2, release_requested);
signal(SIGTERM, terminate);
state = INIT_SELECTING;
// brcm
// run_script(NULL, "deconfig");
// brcm
setStatus(0);
for (;;) {
// brcm
if ((old_mode != listen_mode) || (fd == -1)) {
old_mode = listen_mode;
/*
* After dhcpc runs as daemon(backgroud)mode, fd 0-2 be closed.
* The sock fd may be 0.
*/
if (fd >= 0) {
close(fd);
fd = -1;
}
if (listen_mode == LISTEN_RAW) {
if ((fd = raw_socket(client_config.ifindex)) < 0) {
LOG(LOG_ERR, "couldn't create raw socket -- au revoir");
exit_client(0);
}
}
else if (listen_mode == LISTEN_KERNEL) {
if ((fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface)) < 0) {
LOG(LOG_ERR, "couldn't create server socket -- au revoir");
exit_client(0);
}
} else
fd = -1;
}
tv.tv_sec = timeout - time(0);
tv.tv_usec = 0;
FD_ZERO(&rfds);
if (listen_mode) FD_SET(fd, &rfds);
if (tv.tv_sec > 0) {
retval = select(fd + 1, &rfds, NULL, NULL, &tv);
} else retval = 0; /* If we already timed out, fall through */
if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
// brcm
setStatus(0);
if (packet_num < 3) {
if (packet_num == 0)
xid = random_xid();
/* send discover packet */
send_discover(xid, requested_ip); /* broadcast */
timeout = time(0) + ((packet_num == 2) ? REQ_TIMEOUT : 2);
packet_num++;
} else {
if (client_config.abort_if_no_lease) {
LOG(LOG_INFO,
"No lease, failing.");
exit_client(1);
}
/* wait to try again */
packet_num = 0;
timeout = time(0) + INIT_TIMEOUT;
}
break;
case RENEW_REQUESTED:
case REQUESTING:
if (packet_num < 3) {
/* send request packet */
if (state == RENEW_REQUESTED)
send_renew(xid, server_addr, requested_ip); /* unicast */
else send_selecting(xid, server_addr, requested_ip); /* broadcast */
timeout = time(0) + ((packet_num == 2) ? REQ_TIMEOUT : 2);
packet_num++;
} else {
/* timed out, go back to init state */
state = INIT_SELECTING;
timeout = time(0);
packet_num = 0;
listen_mode = LISTEN_RAW;
}
break;
case BOUND:
/* Lease is starting to run out, time to enter renewing state */
state = RENEWING;
listen_mode = LISTEN_KERNEL;
DEBUG(LOG_INFO, "Entering renew state");
/* fall right through */
case RENEWING:
/* Either set a new T1, or enter REBINDING state */
if ((t2 - t1) <= (lease / 14400 + 1)) {
/* timed out, enter rebinding state */
state = REBINDING;
timeout = time(0) + (t2 - t1);
DEBUG(LOG_INFO, "Entering rebinding state");
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
t1 = (t2 - t1) / 2 + t1;
timeout = t1 + start;
}
break;
case REBINDING:
/* Either set a new T2, or enter INIT state */
if ((lease - t2) <= (lease / 14400 + 1)) {
/* timed out, enter init state */
state = INIT_SELECTING;
LOG(LOG_INFO, "Lease lost, entering init state");
run_script(NULL, "deconfig");
timeout = time(0);
packet_num = 0;
listen_mode = LISTEN_RAW;
} else {
/* send a request packet */
send_renew(xid, 0, requested_ip); /* broadcast */
t2 = (lease - t2) / 2 + t2;
timeout = t2 + start;
}
break;
case RELEASED:
/* yah, I know, *you* say it would never happen */
timeout = 0xffffffff;
break;
}
} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL) {
if (get_packet(&packet, fd) < 0) continue;
} else {
if (get_raw_packet(&packet, fd) < 0) continue;
}
if (packet.xid != xid) {
DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
(unsigned long) packet.xid, xid);
continue;
}
if ((message = (char *)get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
continue;
}
switch (state) {
case INIT_SELECTING:
/* Must be a DHCPOFFER to one of our xid's */
if (*message == DHCPOFFER) {
if ((temp = (char *)get_option(&packet, DHCP_SERVER_ID))) {
memcpy(&server_addr, temp, 4);
xid = packet.xid;
requested_ip = packet.yiaddr;
/* enter requesting state */
state = REQUESTING;
timeout = time(0);
packet_num = 0;
} else {
DEBUG(LOG_ERR, "No server ID in message");
}
}
break;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case REBINDING:
if (*message == DHCPACK) {
if (!(temp = (char *)get_option(&packet, DHCP_LEASE_TIME))) {
LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
lease = 60*60;
} else {
memcpy(&lease, temp, 4);
lease = ntohl(lease);
}
/* enter bound state */
t1 = lease / 2;
/* little fixed point for n * .875 */
t2 = (lease * 0x7) >> 3;
temp_addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
inet_ntoa(temp_addr), lease);
start = time(0);
timeout = t1 + start;
requested_ip = packet.yiaddr;
run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
state = BOUND;
listen_mode = LISTEN_NONE;
// brcm
close(fd);
fd = -1;
setStatus(1);
background();
} else if (*message == DHCPNAK) {
/* return to init state */
LOG(LOG_INFO, "Received DHCP NAK");
if (state != REQUESTING)
run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = time(0);
requested_ip = 0;
packet_num = 0;
listen_mode = LISTEN_RAW;
// brcm
setStatus(0);
}
break;
case BOUND:
case RELEASED:
/* ignore all packets */
break;
}
} else if (retval == -1 && errno == EINTR) {
int udhcpc_main(int argc, char *argv[])
{
unsigned char *temp, *message;
unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease;
fd_set rfds;
int retval;
struct timeval tv;
int c, len;
struct dhcpMessage packet;
struct in_addr temp_addr;
time_t now;
int max_fd;
int sig;
#if 1
FILE *f;
f=fopen("/var/run/udhcpc.pid","w");
fprintf(f,"%d",getpid());
fclose(f);
#endif
static const struct option arg_options[] = {
{"clientid", required_argument, 0, 'c'},
{"foreground", no_argument, 0, 'f'},
{"background", no_argument, 0, 'b'},
{"hostname", required_argument, 0, 'H'},
{"hostname", required_argument, 0, 'h'},
{"interface", required_argument, 0, 'i'},
{"now", no_argument, 0, 'n'},
{"pidfile", required_argument, 0, 'p'},
{"quit", no_argument, 0, 'q'},
{"request", required_argument, 0, 'r'},
{"script", required_argument, 0, 's'},
{"version", no_argument, 0, 'v'},
{0, 0, 0, 0}
};
/* get options */
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "c:fbH:h:i:np:qr:s:v", arg_options, &option_index);
if (c == -1) break;
switch (c) {
case 'c':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.clientid) free(client_config.clientid);
client_config.clientid = xmalloc(len + 2);
client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
client_config.clientid[OPT_LEN] = len;
client_config.clientid[OPT_DATA] = '\0';
strncpy(client_config.clientid + OPT_DATA, optarg, len);
break;
case 'f':
client_config.foreground = 1;
break;
case 'b':
client_config.background_if_no_lease = 1;
break;
case 'h':
case 'H':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.hostname) free(client_config.hostname);
client_config.hostname = xmalloc(len + 2);
client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
client_config.hostname[OPT_LEN] = len;
strncpy(client_config.hostname + 2, optarg, len);
break;
case 'i':
client_config.interface = optarg;
break;
case 'n':
client_config.abort_if_no_lease = 1;
break;
case 'p':
client_config.pidfile = optarg;
break;
case 'q':
client_config.quit_after_lease = 1;
break;
case 'r':
requested_ip = inet_addr(optarg);
break;
case 's':
client_config.script = optarg;
break;
case 'v':
bb_error_msg("version %s\n", VERSION);
return(0);
break;
default:
bb_show_usage();
}
}
start_log("client");
if (read_interface(client_config.interface, &client_config.ifindex,
NULL, client_config.arp) < 0)
return(1);
if (!client_config.clientid) {
client_config.clientid = xmalloc(6 + 3);
client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
client_config.clientid[OPT_LEN] = 7;
client_config.clientid[OPT_DATA] = 1;
memcpy(client_config.clientid + 3, client_config.arp, 6);
}
background(client_config.pidfile);
/* setup signal handlers */
udhcp_set_signal_pipe(SIGUSR2);
state = INIT_SELECTING;
run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
for (;;) {
tv.tv_sec = timeout - time(0);
tv.tv_usec = 0;
FD_ZERO(&rfds);
if (listen_mode != LISTEN_NONE && fd < 0) {
if (listen_mode == LISTEN_KERNEL)
fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
else
fd = raw_socket(client_config.ifindex);
if (fd < 0) {
LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
return(0);
}
}
if (fd >= 0) FD_SET(fd, &rfds);
FD_SET(udhcp_signal_pipe[0], &rfds);
if (tv.tv_sec > 0) {
DEBUG(LOG_INFO, "Waiting on select...\n");
max_fd = udhcp_signal_pipe[0] > fd ? udhcp_signal_pipe[0] : fd;
retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
} else retval = 0; /* If we already timed out, fall through */
now = time(0);
if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
if (packet_num < 3) {
if (packet_num == 0)
xid = random_xid();
/* send discover packet */
send_discover(xid, requested_ip); /* broadcast */
timeout = now + ((packet_num == 2) ? 4 : 2);
packet_num++;
} else {
if (client_config.background_if_no_lease) {
LOG(LOG_INFO, "No lease, forking to background.");
client_background();
} else if (client_config.abort_if_no_lease) {
LOG(LOG_INFO, "No lease, failing.");
return(1);
}
/* wait to try again */
packet_num = 0;
timeout = now + 60;
}
break;
case RENEW_REQUESTED:
case REQUESTING:
if (packet_num < 3) {
/* send request packet */
if (state == RENEW_REQUESTED)
send_renew(xid, server_addr, requested_ip); /* unicast */
else send_selecting(xid, server_addr, requested_ip); /* broadcast */
timeout = now + ((packet_num == 2) ? 10 : 2);
packet_num++;
} else {
/* timed out, go back to init state */
if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
}
break;
case BOUND:
/* Lease is starting to run out, time to enter renewing state */
state = RENEWING;
change_mode(LISTEN_KERNEL);
DEBUG(LOG_INFO, "Entering renew state");
/* fall right through */
case RENEWING:
/* Either set a new T1, or enter REBINDING state */
if ((t2 - t1) <= (lease / 14400 + 1)) {
/* timed out, enter rebinding state */
state = REBINDING;
timeout = now + (t2 - t1);
DEBUG(LOG_INFO, "Entering rebinding state");
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
t1 = (t2 - t1) / 2 + t1;
timeout = t1 + start;
}
break;
case REBINDING:
/* Either set a new T2, or enter INIT state */
if ((lease - t2) <= (lease / 14400 + 1)) {
/* timed out, enter init state */
state = INIT_SELECTING;
LOG(LOG_INFO, "Lease lost, entering init state");
run_script(NULL, "deconfig");
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
} else {
/* send a request packet */
send_renew(xid, 0, requested_ip); /* broadcast */
t2 = (lease - t2) / 2 + t2;
timeout = t2 + start;
}
break;
case RELEASED:
/* yah, I know, *you* say it would never happen */
timeout = 0x7fffffff;
break;
}
} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
len = get_packet(&packet, fd);
else len = get_raw_packet(&packet, fd);
if (len == -1 && errno != EINTR) {
DEBUG(LOG_INFO, "error on read, %m, reopening socket");
change_mode(listen_mode); /* just close and reopen */
}
if (len < 0) continue;
if (packet.xid != xid) {
DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
(unsigned long) packet.xid, xid);
continue;
}
if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
continue;
}
switch (state) {
case INIT_SELECTING:
/* Must be a DHCPOFFER to one of our xid's */
if (*message == DHCPOFFER) {
if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
memcpy(&server_addr, temp, 4);
xid = packet.xid;
requested_ip = packet.yiaddr;
/* enter requesting state */
state = REQUESTING;
timeout = now;
packet_num = 0;
} else {
DEBUG(LOG_ERR, "No server ID in message");
}
}
break;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case REBINDING:
if (*message == DHCPACK) {
if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
lease = 60 * 60;
} else {
memcpy(&lease, temp, 4);
lease = ntohl(lease);
}
/* enter bound state */
t1 = lease / 2;
/* little fixed point for n * .875 */
t2 = (lease * 0x7) >> 3;
temp_addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
inet_ntoa(temp_addr), lease);
start = now;
timeout = t1 + start;
requested_ip = packet.yiaddr;
run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
state = BOUND;
change_mode(LISTEN_NONE);
if (client_config.quit_after_lease)
return(0);
if (!client_config.foreground)
client_background();
} else if (*message == DHCPNAK) {
/* return to init state */
LOG(LOG_INFO, "Received DHCP NAK");
run_script(&packet, "nak");
if (state != REQUESTING)
run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
requested_ip = 0;
packet_num = 0;
change_mode(LISTEN_RAW);
sleep(3); /* avoid excessive network traffic */
}
break;
/* case BOUND, RELEASED: - ignore all packets */
}
} else if (retval > 0 && FD_ISSET(udhcp_signal_pipe[0], &rfds)) {
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_dhcp(void))
{
PT_BEGIN(&s.pt);
/* try_again:*/
s.state = STATE_SENDING;
s.ticks = CLOCK_SECOND;
do {
send_discover();
timer_set(&s.timer, s.ticks);
uip_flags = 0;
PT_WAIT_UNTIL(&s.pt, uip_newdata() || timer_expired(&s.timer));
if(uip_newdata() && parse_msg() == DHCPOFFER) {
s.state = STATE_OFFER_RECEIVED;
break;
}
if(s.ticks < CLOCK_SECOND * 60) {
s.ticks *= 2;
}
} while(s.state != STATE_OFFER_RECEIVED);
s.ticks = CLOCK_SECOND;
do {
send_request();
timer_set(&s.timer, s.ticks);
uip_flags = 0;
PT_WAIT_UNTIL(&s.pt, uip_newdata() || timer_expired(&s.timer));
if(uip_newdata() && parse_msg() == DHCPACK) {
s.state = STATE_CONFIG_RECEIVED;
break;
}
if(s.ticks <= CLOCK_SECOND * 10) {
s.ticks += CLOCK_SECOND;
} else {
PT_RESTART(&s.pt);
}
} while(s.state != STATE_CONFIG_RECEIVED);
#if 0
printf("Got IP address %d.%d.%d.%d\n",
uip_ipaddr1(s.ipaddr), uip_ipaddr2(s.ipaddr),
uip_ipaddr3(s.ipaddr), uip_ipaddr4(s.ipaddr));
printf("Got netmask %d.%d.%d.%d\n",
uip_ipaddr1(s.netmask), uip_ipaddr2(s.netmask),
uip_ipaddr3(s.netmask), uip_ipaddr4(s.netmask));
printf("Got DNS server %d.%d.%d.%d\n",
uip_ipaddr1(s.dnsaddr), uip_ipaddr2(s.dnsaddr),
uip_ipaddr3(s.dnsaddr), uip_ipaddr4(s.dnsaddr));
printf("Got default router %d.%d.%d.%d\n",
uip_ipaddr1(s.default_router), uip_ipaddr2(s.default_router),
uip_ipaddr3(s.default_router), uip_ipaddr4(s.default_router));
printf("Lease expires in %ld seconds\n",
ntohs(s.lease_time[0])*65536ul + ntohs(s.lease_time[1]));
#endif
dhcpc_configured(&s);
/* timer_stop(&s.timer);*/
/*
* PT_END restarts the thread so we do this instead. Eventually we
* should reacquire expired leases here.
*/
while(1) {
PT_YIELD(&s.pt);
}
PT_END(&s.pt);
}
/*---------------------------------------------------------------------------*/
static
PT_THREAD(handle_dhcp(process_event_t ev, void *data))
{
clock_time_t ticks;
PT_BEGIN(&s.pt);
init:
xid++;
s.state = STATE_SENDING;
s.ticks = CLOCK_SECOND;
while (1)
{
while(ev != tcpip_event)
{
tcpip_poll_udp(s.conn);
PT_YIELD(&s.pt);
}
send_discover();
etimer_set(&s.etimer, s.ticks);
do
{
PT_YIELD(&s.pt);
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPOFFER)
{
parse_msg();
s.state = STATE_OFFER_RECEIVED;
goto selecting;
}
}
while (!etimer_expired(&s.etimer));
if(s.ticks < CLOCK_SECOND * 60)
{
s.ticks *= 2;
}
}
selecting:
xid++;
s.ticks = CLOCK_SECOND;
do
{
while(ev != tcpip_event)
{
tcpip_poll_udp(s.conn);
PT_YIELD(&s.pt);
}
send_request();
etimer_set(&s.etimer, s.ticks);
do
{
PT_YIELD(&s.pt);
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK)
{
parse_msg();
s.state = STATE_CONFIG_RECEIVED;
goto bound;
}
}
while (!etimer_expired(&s.etimer));
if(s.ticks <= CLOCK_SECOND * 10)
{
s.ticks += CLOCK_SECOND;
}
else
{
goto init;
}
}
while(s.state != STATE_CONFIG_RECEIVED);
bound:
#if 0
printf("Got IP address %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.ipaddr));
printf("Got netmask %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.netmask));
printf("Got DNS server %d.%d.%d.%d\n", uip_ipaddr_to_quad(&s.dnsaddr));
printf("Got default router %d.%d.%d.%d\n",
uip_ipaddr_to_quad(&s.default_router));
printf("Lease expires in %ld seconds\n",
uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]));
#endif
dhcpc_configured(&s);
#define MAX_TICKS (~((clock_time_t)0) / 2)
#define MAX_TICKS32 (~((uint32_t)0))
#define IMIN(a, b) ((a) < (b) ? (a) : (b))
if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
<= MAX_TICKS32)
{
s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
)*CLOCK_SECOND/2;
}
else
{
s.ticks = MAX_TICKS32;
}
while(s.ticks > 0)
{
ticks = IMIN(s.ticks, MAX_TICKS);
s.ticks -= ticks;
etimer_set(&s.etimer, ticks);
PT_YIELD_UNTIL(&s.pt, etimer_expired(&s.etimer));
}
if((uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1]))*CLOCK_SECOND/2
<= MAX_TICKS32)
{
s.ticks = (uip_ntohs(s.lease_time[0])*65536ul + uip_ntohs(s.lease_time[1])
)*CLOCK_SECOND/2;
}
else
{
s.ticks = MAX_TICKS32;
}
/* renewing: */
xid++;
do
{
while(ev != tcpip_event)
{
tcpip_poll_udp(s.conn);
PT_YIELD(&s.pt);
}
send_request();
ticks = IMIN(s.ticks / 2, MAX_TICKS);
s.ticks -= ticks;
etimer_set(&s.etimer, ticks);
do
{
PT_YIELD(&s.pt);
if(ev == tcpip_event && uip_newdata() && msg_for_me() == DHCPACK)
{
parse_msg();
goto bound;
}
}
while(!etimer_expired(&s.etimer));
}
while(s.ticks >= CLOCK_SECOND*3);
/* rebinding: */
/* lease_expired: */
dhcpc_unconfigured(&s);
goto init;
PT_END(&s.pt);
}
static PT_THREAD (handle_dhcp (void))
{
PT_BEGIN (&dhcpcState->pt);
dhcpcState->state = STATE_SENDING;
dhcpcState->ticks = CLOCK_SECOND;
do
{
send_discover ();
timer_set (&dhcpcState->timer, dhcpcState->ticks);
PT_WAIT_UNTIL (&dhcpcState->pt, uip_newdata () || timer_expired (&dhcpcState->timer));
if (uip_newdata () && (parse_msg () == DHCPOFFER))
{
uip_flags &= ~UIP_NEWDATA;
dhcpcState->state = STATE_OFFER_RECEIVED;
break;
}
uip_flags &= ~UIP_NEWDATA;
if (dhcpcState->ticks < CLOCK_SECOND * 60)
dhcpcState->ticks *= 2;
else
{
dhcpcState->ipaddr [0] = dhcpcState->ipaddr [1] = 0;
goto dhcpcf;
}
}
while (dhcpcState->state != STATE_OFFER_RECEIVED);
dhcpcState->ticks = CLOCK_SECOND;
do
{
send_request ();
timer_set (&dhcpcState->timer, dhcpcState->ticks);
PT_WAIT_UNTIL (&dhcpcState->pt, uip_newdata () || timer_expired (&dhcpcState->timer));
if (uip_newdata () && (parse_msg () == DHCPACK))
{
uip_flags &= ~UIP_NEWDATA;
dhcpcState->state = STATE_CONFIG_RECEIVED;
break;
}
uip_flags &= ~UIP_NEWDATA;
if (dhcpcState->ticks <= CLOCK_SECOND * 10)
dhcpcState->ticks += CLOCK_SECOND;
else
PT_RESTART (&dhcpcState->pt);
}
while (dhcpcState->state != STATE_CONFIG_RECEIVED);
dhcpcf:
dhcpc_configured (dhcpcState);
/* timer_stop (&dhcpcState->timer);*/
/*
* PT_END restarts the thread so we do this instead. Eventually we
* should reacquire expired leases here.
*/
while (1)
PT_YIELD (&dhcpcState->pt);
PT_END (&dhcpcState->pt);
}
static void
handle_dhcp(process_event_t message)
{
time_t seconds;
switch( dhcpc_state.state )
{
case DHCP_STATE_INITIAL:
dhcpc_state.state = DHCP_STATE_DISCOVER;
xid++;
send_discover();
stimer_set(&dhcpc_state.stimer, (time_t)10 ); // normally set the timer for 60 seconds,
// but because the ARP table is empty give DHCP server only 10 seconds.
break;
case DHCP_STATE_DISCOVER:
if( !stimer_expired(&dhcpc_state.stimer) && message == DHCP_OFFER )
{
parse_msg();
dhcpc_state.state = DHCP_STATE_REQUEST;
xid++;
send_request();
stimer_set(&dhcpc_state.stimer, (time_t)10 ); // set the timer for 10 seconds
} else {
dhcpc_state.state = DHCP_STATE_INITIAL;
}
break;
case DHCP_STATE_REQUEST:
if( !stimer_expired(&dhcpc_state.stimer) && message == DHCP_ACK )
{
parse_msg();
dhcpc_state.state = DHCP_STATE_LEASED;
PRINTF("Got IP address %d.%d.%d.%d\n", uip_ipaddr_to_quad(&dhcpc_state.ipaddr));
PRINTF("Got netmask %d.%d.%d.%d\n", uip_ipaddr_to_quad(&dhcpc_state.netmask));
PRINTF("Got DNS server %d.%d.%d.%d\n", uip_ipaddr_to_quad(&dhcpc_state.dnsaddr));
PRINTF("Got default router %d.%d.%d.%d\n", uip_ipaddr_to_quad(&dhcpc_state.default_router));
PRINTF("Lease expires in %ld seconds\n", uip_ntohs(dhcpc_state.lease_time[0])*65536ul + uip_ntohs(dhcpc_state.lease_time[1]));
dhcpc_configured(&dhcpc_state);
#define MAX_TICKS (~((time_t)0) / 2)
#define MAX_TICKS32 (~((time_t)0))
if((uip_ntohs(dhcpc_state.lease_time[0])*65536ul + uip_ntohs(dhcpc_state.lease_time[1]))/2 <= MAX_TICKS32)
{
seconds = ( uip_ntohs(dhcpc_state.lease_time[0])*65536ul + uip_ntohs(dhcpc_state.lease_time[1]) )/2;
} else {
seconds = MAX_TICKS32;
}
stimer_set(&dhcpc_state.stimer, seconds); // set the timer for half of lease_time seconds
} else {
dhcpc_state.state = DHCP_STATE_INITIAL;
}
break;
case DHCP_STATE_LEASED:
if( stimer_expired(&dhcpc_state.stimer) )
{
dhcpc_state.state = DHCP_STATE_INITIAL;
}
break;
case DHCP_STATE_REREQUEST:
case DHCP_STATE_RELEASE:
default:
dhcpc_state.state = DHCP_STATE_INITIAL;
break;
}
}
int main(int argc, char *argv[])
#endif
{
uint8_t *temp, *message;
unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease;
fd_set rfds;
int retval;
struct timeval tv;
int c, len;
struct dhcpMessage packet;
struct in_addr temp_addr;
long now;
int max_fd;
int sig;
int no_clientid = 0;
int fail_times = 0; /* how many times that we fail to find a dhcp server */
int server_unicast = 0;
static const struct option arg_options[] = {
{"clientid", required_argument, 0, 'c'},
{"clientid-none", no_argument, 0, 'C'},
{"foreground", no_argument, 0, 'f'},
{"background", no_argument, 0, 'b'},
{"hostname", required_argument, 0, 'H'},
{"hostname", required_argument, 0, 'h'},
{"interface", required_argument, 0, 'i'},
{"now", no_argument, 0, 'n'},
{"pidfile", required_argument, 0, 'p'},
{"quit", no_argument, 0, 'q'},
{"request", required_argument, 0, 'r'},
{"script", required_argument, 0, 's'},
{"unicast", no_argument, 0, 'u'}, /* unicast flag */
{"version", no_argument, 0, 'v'},
{0, 0, 0, 0}
};
/* get options */
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "c:CfbH:h:i:np:qr:s:uv", arg_options, &option_index);
if (c == -1) break;
switch (c) {
case 'c':
if (no_clientid) show_usage();
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.clientid) free(client_config.clientid);
client_config.clientid = xmalloc(len + 2);
client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
client_config.clientid[OPT_LEN] = len;
client_config.clientid[OPT_DATA] = '\0';
strncpy(client_config.clientid + OPT_DATA, optarg, len);
break;
case 'C':
if (client_config.clientid) show_usage();
no_clientid = 1;
break;
case 'f':
client_config.foreground = 1;
break;
case 'b':
client_config.background_if_no_lease = 1;
break;
case 'h':
case 'H':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
if (client_config.hostname) free(client_config.hostname);
client_config.hostname = xmalloc(len + 2);
client_config.hostname[OPT_CODE] = DHCP_HOST_NAME;
client_config.hostname[OPT_LEN] = len;
strncpy(client_config.hostname + 2, optarg, len);
break;
case 'i':
client_config.interface = optarg;
break;
case 'n':
client_config.abort_if_no_lease = 1;
break;
case 'p':
client_config.pidfile = optarg;
break;
case 'q':
client_config.quit_after_lease = 1;
break;
case 'r':
requested_ip = inet_addr(optarg);
break;
case 's':
client_config.script = optarg;
break;
case 'u':
server_unicast = 1;
break;
case 'v':
printf("udhcpcd, version %s\n\n", VERSION);
return 0;
break;
default:
show_usage();
}
}
/* Start the log, sanitize fd's, and write a pid file */
start_log_and_pid("udhcpc", client_config.pidfile);
if (read_interface(client_config.interface, &client_config.ifindex,
NULL, client_config.arp) < 0)
return 1;
/* if not set, and not suppressed, setup the default client ID */
if (!client_config.clientid && !no_clientid) {
client_config.clientid = xmalloc(6 + 3);
client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID;
client_config.clientid[OPT_LEN] = 7;
client_config.clientid[OPT_DATA] = 1;
memcpy(client_config.clientid + 3, client_config.arp, 6);
}
/* changed by lsz 070621 */
client_background();
/* setup the signal pipe */
udhcp_sp_setup();
//if (dhcpc_shm_init() != 0)
// return -1;
#include "msgq.h"
dhcp_ipc_fork(DHCPC);
state = INIT_SELECTING;
run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
for (;;) {
tv.tv_sec = timeout - uptime();
tv.tv_usec = 0;
if (listen_mode != LISTEN_NONE && fd < 0) {
if (listen_mode == LISTEN_KERNEL)
fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
else
fd = raw_socket(client_config.ifindex);
if (fd < 0) {
LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
return 0;
}
}
/*
* select don't return when timeout value is larger than 1.5 hours
* we just wait multiple times
* added by tiger 090819, should fix later
*/
struct timeval tp_timeout;
#define TP_TIMEOUT_MAX (30*60)
if (tv.tv_sec > 0)
{
do
{
max_fd = udhcp_sp_fd_set(&rfds, fd);
tp_timeout.tv_sec = (tv.tv_sec > TP_TIMEOUT_MAX) ? TP_TIMEOUT_MAX : tv.tv_sec;
tv.tv_sec -= tp_timeout.tv_sec;
tp_timeout.tv_usec = 0;
retval = select(max_fd + 1, &rfds, NULL, NULL, &tp_timeout);
} while (tv.tv_sec > 0 && retval == 0);
}
else
{
retval = 0; /* If we already timed out, fall through */
}
now = uptime();
if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
#define DISCOVER_RETRY_TIMES 5
#define DISCOVER_INVERT_TIMES 3
if (packet_num < DISCOVER_RETRY_TIMES) {
if (packet_num == 0)
{
xid = random_xid();
/* use user config dhcp flags when first discover, added by tiger 20090821 */
if (server_unicast)
{
set_runtime_dhcp_flags(DHCP_FLAGS_UNICAST);
}
else
{
set_runtime_dhcp_flags(DHCP_FLAGS_BROADCAST);
}
}
/* change runtime dhcp flags when exceed DISCOVER_INVERT_TIMES added by tiger 20090819 apply 11G and XP's option */
if (DISCOVER_INVERT_TIMES == packet_num)
{
invert_runtime_dhcp_flags();
}
/* send discover packet */
//send_discover(xid, requested_ip, server_unicast); /* broadcast */
/* modified by tiger 20090304, reply mode's setting way changed */
send_discover(xid, requested_ip);
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send DISCOVER with request ip %X and unicast flag %d", requested_ip, get_runtime_dhcp_flags());
timeout = now + ((packet_num == 2) ? 4 : 2);
packet_num++;
} else {
run_script(NULL, "leasefail");
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC DHCP Service unavailable, recv no OFFER");
if (client_config.background_if_no_lease) {
LOG(LOG_INFO, "No lease, forking to background.");
client_background();
} else if (client_config.abort_if_no_lease) {
LOG(LOG_INFO, "No lease, failing.");
return 1;
}
/* wait to try again */
packet_num = 0;
timeout = now + 10 + (fail_times ++) * 30;
/* 60->6000, we dont need to try again -- lsz, 080722 */
/* 6000->30*fail_times -- lsz, 081008 */
}
break;
case RENEW_REQUESTED:
case REQUESTING:
if (packet_num < 3) {
/* send request packet */
if (state == RENEW_REQUESTED)
{
send_renew(xid, server_addr, requested_ip); /* unicast */
}
else
{
send_selecting(xid, server_addr, requested_ip); /* broadcast */
}
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip);
timeout = now + ((packet_num == 2) ? 10 : 2);
packet_num++;
} else {
/* timed out, go back to init state */
if (state == RENEW_REQUESTED) run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
}
break;
case BOUND:
/* Lease is starting to run out, time to enter renewing state */
state = RENEWING;
change_mode(LISTEN_KERNEL);
DEBUG(LOG_INFO, "Entering renew state");
/* fall right through */
case RENEWING:
/* Either set a new T1, or enter REBINDING state */
if ((t2 - t1) <= (lease / 14400 + 1)) {
/* timed out, enter rebinding state */
state = REBINDING;
timeout = now + (t2 - t1);
DEBUG(LOG_INFO, "Entering rebinding state");
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip);
t1 = (t2 - t1) / 2 + t1;
timeout = t1 + start;
}
break;
case REBINDING:
/* Either set a new T2, or enter INIT state */
if ((lease - t2) <= (lease / 14400 + 1)) {
/* timed out, enter init state */
state = INIT_SELECTING;
LOG(LOG_INFO, "Lease lost, entering init state");
run_script(NULL, "deconfig");
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
} else {
/* send a request packet */
send_renew(xid, 0, requested_ip); /* broadcast */
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Broadcast REQUEST with request ip %x", requested_ip);
t2 = (lease - t2) / 2 + t2;
timeout = t2 + start;
}
break;
case RELEASED:
/* yah, I know, *you* say it would never happen */
timeout = 0x7fffffff;
break;
}
}
else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
len = get_packet(&packet, fd);
else len = get_raw_packet(&packet, fd);
if (len == -1 && errno != EINTR) {
DEBUG(LOG_INFO, "error on read, %m, reopening socket");
change_mode(listen_mode); /* just close and reopen */
}
if (len < 0) continue;
if (packet.xid != xid) {
DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)",
(unsigned long) packet.xid, xid);
continue;
}
/* Ignore packets that aren't for us */
if (memcmp(packet.chaddr, client_config.arp, 6)) {
DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring");
continue;
}
if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring");
continue;
}
switch (state) {
case INIT_SELECTING:
/* Must be a DHCPOFFER to one of our xid's */
if (*message == DHCPOFFER) {
if ((temp = get_option(&packet, DHCP_SERVER_ID))) {
memcpy(&server_addr, temp, 4);
xid = packet.xid;
requested_ip = packet.yiaddr;
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv OFFER from server %x with ip %x", server_addr, requested_ip);
/* enter requesting state */
state = REQUESTING;
timeout = now;
packet_num = 0;
} else {
DEBUG(LOG_ERR, "No server ID in message");
}
}
break;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case REBINDING:
if (*message == DHCPACK) {
if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) {
LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease");
lease = 60 * 60;
} else {
memcpy(&lease, temp, 4);
lease = ntohl(lease);
}
/* RFC 2131 3.1 paragraph 5:
* "The client receives the DHCPACK message with configuration
* parameters. The client SHOULD perform a final check on the
* parameters (e.g., ARP for allocated network address), and notes
* the duration of the lease specified in the DHCPACK message. At this
* point, the client is configured. If the client detects that the
* address is already in use (e.g., through the use of ARP),
* the client MUST send a DHCPDECLINE message to the server and restarts
* the configuration process..."
* added by tiger 20090827
*/
if (!arpping(packet.yiaddr,
(uint32_t) 0,
packet.yiaddr,
client_config.arp,
client_config.interface)
) {
msglogd (LOG_INFO, LOGTYPE_DHCP, "DHCPC: offered address is in use "
"(got ARP reply), Send decline");
send_decline(xid, server_addr, packet.yiaddr);
if (state != REQUESTING)
run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
state = INIT_SELECTING;
requested_ip = 0;
timeout = now + 12;
packet_num = 0;
continue; /* back to main loop */
}
/* enter bound state */
t1 = lease / 2;
/* little fixed point for n * .875 */
t2 = (lease * 0x7) >> 3;
temp_addr.s_addr = packet.yiaddr;
LOG(LOG_INFO, "Lease of %s obtained, lease time %ld",
inet_ntoa(temp_addr), lease);
start = now;
timeout = t1 + start;
requested_ip = packet.yiaddr;
if ((temp = get_option(&packet, DHCP_SERVER_ID)))
memcpy(&server_addr, temp, 4);
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv ACK from server %x with ip %x lease time %ld",
server_addr, requested_ip, lease);
run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
fail_times = 0; /* clear the retry counter */
state = BOUND;
change_mode(LISTEN_NONE);
if (client_config.quit_after_lease)
return 0;
if (!client_config.foreground)
client_background();
} else if (*message == DHCPNAK) {
/* return to init state */
LOG(LOG_INFO, "Received DHCP NAK");
if ((temp = get_option(&packet, DHCP_SERVER_ID)))
memcpy(&server_addr, temp, 4);
msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv NAK from server %x with ip %x", server_addr, requested_ip);
run_script(&packet, "nak");
if (state != REQUESTING)
run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now + 3; /* change by lsz 080905, without this 3 seconds,
* the udhcpc will keep on trying and the release
* msg cant be recved by udhcpc, even if we are
* wan static ip now, the udhcpc is still sending
* discover pkts.
*/
requested_ip = 0;
packet_num = 0;
change_mode(LISTEN_RAW);
//sleep(3); /* avoid excessive network traffic */
}
break;
/* case BOUND, RELEASED: - ignore all packets */
}
}
else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
static void dhcp_run(void)
{
static bool udp_open_fail = FALSE;
if(di.state == DHCP_STATE_INIT && di.action != DHCP_ACT_START) {
DBG("wrong attempt");
return;
} else if(GetUDPSocketStatus(di.sock) == SOCKSTAT_CLOSED) {
if(udp_open_fail == TRUE && !IS_TIME_PASSED(dhcp_run_tick, DHCP_RETRY_DELAY))
goto RET_ALARM;
if(UDPOpen(di.sock, DHCP_CLIENT_PORT) == RET_OK) {
if(dhcp_async) sockwatch_open(di.sock, dhcp_async_cb);
udp_open_fail = FALSE;
dhcp_run_tick = wizpf_get_systick();
dhcp_run_cnt = 0;
} else {
ERR("UDPOpen fail");
udp_open_fail = TRUE;
dhcp_run_tick = wizpf_get_systick();
goto RET_ALARM;
}
}
switch(di.state) {
case DHCP_STATE_INIT:
if(dhcp_run_cnt==0 && !IS_TIME_PASSED(dhcp_run_tick, DHCP_OPEN_DELAY))
goto RET_ALARM;
if(dhcp_run_cnt < DHCP_SEND_RETRY_COUNT) {
dhcp_run_cnt++;
if(send_discover() == RET_OK) { // Discover ok
if(dhcp_async) {
DBG("DHCP Discovery Send Async");
sockwatch_set(di.sock, WATCH_SOCK_UDP_SEND);
return; // alarm set is not needed
} else {
DBG("DHCP Discovery Sent");
SET_STATE(DHCP_STATE_SEARCHING);
dhcp_run_tick = wizpf_get_systick();
}
} else {
ERRA("DHCP Discovery SEND fail - (%d)times", dhcp_run_cnt);
dhcp_run_tick = wizpf_get_systick();
}
} else {
ERRA("DHCP Discovery SEND fail - (%d)times", dhcp_run_cnt);
dhcp_run_cnt = 0;
UDPClose(di.sock);
if(dhcp_async) sockwatch_close(di.sock);
dhcp_fail();
return; // alarm set is not needed
}
break;
case DHCP_STATE_SEARCHING:
if(!IS_TIME_PASSED(dhcp_run_tick, DHCP_RETRY_DELAY)) {
int8 ret = recv_handler();
if(ret == DHCP_MSG_OFFER) {
SET_STATE(DHCP_STATE_SELECTING);
dhcp_run_tick = wizpf_get_systick();
dhcp_run_cnt = 0;
} else if(ret != RET_NOK) DBGCRTCA(TRUE, "recv wrong packet(%d)", ret);
} else {
ERRA("DHCP Offer RECV fail - for (%d)msec", DHCP_RETRY_DELAY);
SET_STATE(DHCP_STATE_INIT);
dhcp_run_tick = wizpf_get_systick();
}
break;
case DHCP_STATE_SELECTING:
if(dhcp_run_cnt < DHCP_SEND_RETRY_COUNT) {
dhcp_run_cnt++;
if(send_request() == RET_OK) { // Request ok
if(dhcp_async) {
DBG("DHCP Request Send Async");
sockwatch_set(di.sock, WATCH_SOCK_UDP_SEND);
return; // alarm set is not needed
} else {
DBG("DHCP Request Sent");
SET_STATE(DHCP_STATE_REQUESTING);
dhcp_run_tick = wizpf_get_systick();
}
} else {
ERRA("DHCP Request SEND fail - (%d)times", dhcp_run_cnt);
dhcp_run_tick = wizpf_get_systick();
}
} else {
ERRA("DHCP Request SEND fail - (%d)times", dhcp_run_cnt);
dhcp_run_cnt = 0;
UDPClose(di.sock);
if(dhcp_async) sockwatch_close(di.sock);
dhcp_fail();
return; // alarm set is not needed
}
break;
case DHCP_STATE_REQUESTING:
if(!IS_TIME_PASSED(dhcp_run_tick, DHCP_RETRY_DELAY)) {
int8 ret = recv_handler();
if(ret == DHCP_MSG_ACK) { // Recv ACK
LOG("DHCP Success");
SET_STATE(DHCP_STATE_IP_CHECK);
dhcp_run_tick = wizpf_get_systick();
dhcp_run_cnt = 0;
} else if(ret == DHCP_MSG_NAK) { // Recv NAK
if(di.action == DHCP_ACT_START) {
SET_STATE(DHCP_STATE_INIT);
dhcp_run_tick = wizpf_get_systick();
} else {
SET_STATE(DHCP_STATE_BOUND);
}
dhcp_run_cnt = 0;
} else if(ret != RET_NOK) DBGCRTCA(TRUE, "recv wrong packet(%d)", ret);
} else {
ERRA("DHCP ACK RECV fail - for (%d)msec", DHCP_RETRY_DELAY);
if(di.action == DHCP_ACT_START) {
SET_STATE(DHCP_STATE_INIT);
dhcp_run_tick = wizpf_get_systick();
} else {
SET_STATE(DHCP_STATE_BOUND);
}
}
break;
case DHCP_STATE_IP_CHECK:
//if(send_checker() == RET_OK) {
SET_STATE(DHCP_STATE_BOUND);
workinfo.DHCP = NETINFO_DHCP_STABLE;
SetNetInfo(&workinfo);
if(di.ip_update) di.ip_update();
LOGA("DHCP ok - New IP (%d.%d.%d.%d)", workinfo.IP[0], workinfo.IP[1], workinfo.IP[2], workinfo.IP[3]);
//bound_tick = wizpf_get_systick();
UDPClose(di.sock);
if(dhcp_async) sockwatch_close(di.sock);
//} else {
// SET_STATE(DHCP_STATE_INIT);
// ERR("IP Addr conflicted - IP(%d.%d.%d.%d)", workinfo.IP[0], workinfo.IP[1], workinfo.IP[2], workinfo.IP[3]);
// send_rel_dec(DHCP_MSG_DECLINE);
// if(di.ip_conflict) (*di.ip_conflict)();
//}
break;
case DHCP_STATE_BOUND:
return; // alarm set is not needed
default:
ERRA("wrong state(%d)", di.state);
return; // alarm set is not needed
}
RET_ALARM:
if(dhcp_alarm) alarm_set(10, dhcp_alarm_cb, 0);
}
void Casan::loop ()
{
Msg in (l2_) ;
Msg out (l2_) ;
l2net::l2_recv_t ret ;
uint8_t oldstatus ;
long int hlid ;
l2addr *srcaddr ;
int mtu ; // mtu announced by master in assoc msg
oldstatus = status_ ; // keep old value for debug display
sync_time (curtime) ; // get current time
retrans_.loop (*l2_, curtime) ; // check needed retransmissions
srcaddr = NULL ;
ret = in.recv () ; // get received message
if (ret == l2net::RECV_OK)
srcaddr = l2_->get_src () ; // get a new address
switch (status_)
{
case SL_COLDSTART :
send_discover (out) ;
twait_.init (curtime) ;
status_ = SL_WAITING_UNKNOWN ;
break ;
case SL_WAITING_UNKNOWN :
if (ret == l2net::RECV_OK)
{
retrans_.check_msg_received (in) ;
if (is_ctl_msg (in))
{
if (is_hello (in, hlid))
{
DBGLN1 (F ("Received a CTL HELLO msg")) ;
change_master (hlid, -1) ; // don't change mtu
twait_.init (curtime) ;
status_ = SL_WAITING_KNOWN ;
}
else if (is_assoc (in, sttl_, mtu))
{
DBGLN1 (F ("Received a CTL ASSOC msg")) ;
change_master (-1, mtu) ; // "unknown" hlid
send_assoc_answer (in, out) ;
trenew_.init (curtime, sttl_) ;
status_ = SL_RUNNING ;
}
else DBGLN1 (F (RED ("Unkwnon CTL"))) ;
}
}
if (status_ == SL_WAITING_UNKNOWN && twait_.next (curtime))
send_discover (out) ;
break ;
case SL_WAITING_KNOWN :
if (ret == l2net::RECV_OK)
{
retrans_.check_msg_received (in) ;
if (is_ctl_msg (in))
{
if (is_hello (in, hlid))
{
DBGLN1 (F ("Received a CTL HELLO msg")) ;
change_master (hlid, -1) ; // don't change mtu
}
else if (is_assoc (in, sttl_, mtu))
{
DBGLN1 (F ("Received a CTL ASSOC msg")) ;
change_master (-1, mtu) ; // unknown hlid
send_assoc_answer (in, out) ;
trenew_.init (curtime, sttl_) ;
status_ = SL_RUNNING ;
}
else DBGLN1 (F (RED ("Unkwnon CTL"))) ;
}
}
if (status_ == SL_WAITING_KNOWN)
{
if (twait_.expired (curtime))
{
reset_master () ; // master_ is no longer known
send_discover (out) ;
twait_.init (curtime) ; // reset timer
status_ = SL_WAITING_UNKNOWN ;
}
else if (twait_.next (curtime))
{
send_discover (out) ;
}
}
break ;
case SL_RUNNING :
case SL_RENEW :
if (ret == l2net::RECV_OK)
{
retrans_.check_msg_received (in) ;
if (is_ctl_msg (in))
{
if (is_hello (in, hlid))
{
DBGLN1 (F ("Received a CTL HELLO msg")) ;
if (! same_master (srcaddr) || hlid != hlid_)
{
int oldhlid = hlid_ ;
change_master (hlid, 0) ; // reset mtu
if (oldhlid != -1)
{
twait_.init (curtime) ;
status_ = SL_WAITING_KNOWN ;
}
}
}
else if (is_assoc (in, sttl_, mtu))
{
DBGLN1 (F ("Received a CTL ASSOC msg")) ;
if (same_master (srcaddr))
{
negociate_mtu (mtu) ;
send_assoc_answer (in, out) ;
trenew_.init (curtime, sttl_) ;
status_ = SL_RUNNING ;
}
}
else DBGLN1 (F (RED ("Unkwnon CTL"))) ;
}
else // request for a normal resource
{
// deduplicate () ;
process_request (in, out) ;
out.send (*master_) ;
}
}
else if (ret == l2net::RECV_TRUNCATED)
{
DBGLN1 (F (RED ("Request too large"))) ;
out.set_type (COAP_TYPE_ACK) ;
out.set_id (in.get_id ()) ;
out.set_token (in.get_token ()) ;
option o (option::MO_Size1, l2_->mtu ()) ;
out.push_option (o) ;
out.set_code (COAP_CODE_TOO_LARGE) ;
out.send (*master_) ;
}
check_observed_resources (out) ;
if (status_ == SL_RUNNING && trenew_.renew (curtime))
{
send_discover (out) ;
status_ = SL_RENEW ;
}
if (status_ == SL_RENEW && trenew_.next (curtime))
{
send_discover (out) ;
}
if (status_ == SL_RENEW && trenew_.expired (curtime))
{
reset_master () ; // master_ is no longer known
send_discover (out) ;
twait_.init (curtime) ; // reset timer
status_ = SL_WAITING_UNKNOWN ;
}
break ;
default :
DBGLN1 (F ("Error : casan status not known")) ;
DBGLN1 (status_) ;
break ;
}
if (oldstatus != status_)
{
DBG1 (F ("Status: " C_GREEN)) ;
print_status (oldstatus) ;
DBG1 (F (C_RESET " -> " C_GREEN)) ;
print_status (status_) ;
DBGLN1 (F (C_RESET)) ;
}
if (srcaddr != NULL)
delete srcaddr ;
}
void dhcp_net_main(void) {
if(uip_newdata()) {
switch (uip_udp_conn->appstate.dhcp.state) {
case STATE_DISCOVERING:
if (parse_msg() == DHCPOFFER) {
send_request();
uip_flags &= ~UIP_NEWDATA;
uip_udp_conn->appstate.dhcp.state = STATE_REQUESTING;
uip_udp_conn->appstate.dhcp.retry_timer = 2; // retry
uip_udp_conn->appstate.dhcp.retry_counter = 1;
tick_sec = 0;
}
break;
case STATE_REQUESTING:
if (parse_msg() == DHCPACK) {
uip_udp_conn->appstate.dhcp.state = STATE_CONFIGURED;
uip_sethostaddr(uip_udp_conn->appstate.dhcp.ipaddr);
uip_setdraddr(uip_udp_conn->appstate.dhcp.default_router);
uip_setnetmask(uip_udp_conn->appstate.dhcp.netmask);
#ifdef DNS_SUPPORT
resolv_conf(uip_udp_conn->appstate.dhcp.dnsaddr);
// eeprom_save(dns_server, &uip_udp_conn->appstate.dhcp.dnsaddr, IPADDR_LEN);
#endif
// eeprom_save(ip, &uip_udp_conn->appstate.dhcp.ipaddr, IPADDR_LEN);
// eeprom_save(netmask, &uip_udp_conn->appstate.dhcp.netmask, IPADDR_LEN);
// eeprom_save(gateway, &uip_udp_conn->appstate.dhcp.default_router, IPADDR_LEN);
// eeprom_update_chksum();
/* Remove the bootp connection */
uip_udp_remove(uip_udp_conn);
}
break;
}
} else {
// No data yet
switch (uip_udp_conn->appstate.dhcp.state) {
case STATE_INITIAL:
case STATE_DISCOVERING:
if (tick_sec>uip_udp_conn->appstate.dhcp.retry_timer) {
send_discover();
uip_flags &= ~UIP_NEWDATA;
uip_udp_conn->appstate.dhcp.state = STATE_DISCOVERING;
if (uip_udp_conn->appstate.dhcp.retry_counter++>10)
return dhcp_set_static();
uip_udp_conn->appstate.dhcp.retry_timer = 2 * uip_udp_conn->appstate.dhcp.retry_counter; // retry
tick_sec = 0;
}
break;
case STATE_REQUESTING:
if (tick_sec>uip_udp_conn->appstate.dhcp.retry_timer) {
send_request();
uip_flags &= ~UIP_NEWDATA;
if (uip_udp_conn->appstate.dhcp.retry_counter++>10)
return dhcp_set_static();
uip_udp_conn->appstate.dhcp.retry_timer = 2; // retry
tick_sec = 0;
}
break;
}
}
}
