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;
}
if (ENABLE_FEATURE_UDHCP_SYSLOG) {
openlog(applet_name, LOG_PID, LOG_LOCAL0);
logmode |= LOGMODE_SYSLOG;
}
if (read_interface(client_config.interface, &client_config.ifindex,
NULL, client_config.arp) < 0)
return 1;
/* Sanitize fd's and write pidfile */
udhcp_make_pidfile(client_config.pidfile);
/* 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;
if (listen_mode != LISTEN_NONE && sockfd < 0) {
if (listen_mode == LISTEN_KERNEL)
sockfd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
else
sockfd = raw_socket(client_config.ifindex);
}
max_fd = udhcp_sp_fd_set(&rfds, sockfd);
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 (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");
retval = 1;
goto ret;
}
/* wait to try again */
packet_num = 0;
timeout = now + 60;
}
break;
case RENEW_REQUESTED:
case REQUESTING:
if (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(sockfd, &rfds)) {
/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
len = udhcp_get_packet(&packet, sockfd);
else len = get_raw_packet(&packet, sockfd);
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;
}
message = get_option(&packet, DHCP_MESSAGE_TYPE);
if (message == 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 */
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;
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();
goto ret0;
}
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
{
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;
time_t now;
int max_fd;
int sig;
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':
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 (!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);
}
/* setup the signal pipe */
udhcp_sp_setup();
state = INIT_SELECTING;
run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
for (;;) {
tv.tv_sec = timeout - time(0);
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;
}
}
max_fd = udhcp_sp_fd_set(&rfds, fd);
if (tv.tv_sec > 0) {
DEBUG(LOG_INFO, "Waiting on select...");
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 {
run_script(NULL, "leasefail");
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 && (sig = udhcp_sp_read(&rfds))) {
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))) {