busybox/networking/udhcp/dhcpc.c

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/* vi: set sw=4 ts=4: */
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/* dhcpc.c
*
* udhcp DHCP client
*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include <getopt.h>
#include <syslog.h>
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#include "common.h"
#include "dhcpd.h"
#include "dhcpc.h"
#include "options.h"
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/* Something is definitely wrong here. IPv4 addresses
* in variables of type long?? BTW, we use inet_ntoa()
* in the code. Manpage says that struct in_addr has a member of type long (!)
* which holds IPv4 address, and the struct is passed by value (!!)
*/
static unsigned long timeout;
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static unsigned long requested_ip; /* = 0 */
static uint32_t server_addr;
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static int packet_num; /* = 0 */
static int sockfd = -1;
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#define LISTEN_NONE 0
#define LISTEN_KERNEL 1
#define LISTEN_RAW 2
static smallint listen_mode;
static smallint state;
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struct client_config_t client_config;
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/* just a little helper */
static void change_mode(int new_mode)
{
DEBUG("entering %s listen mode",
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new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
if (sockfd >= 0) {
close(sockfd);
sockfd = -1;
}
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listen_mode = new_mode;
}
/* perform a renew */
static void perform_renew(void)
{
bb_info_msg("Performing a DHCP renew");
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switch (state) {
case BOUND:
change_mode(LISTEN_KERNEL);
case RENEWING:
case REBINDING:
state = RENEW_REQUESTED;
break;
case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
udhcp_run_script(NULL, "deconfig");
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case REQUESTING:
case RELEASED:
change_mode(LISTEN_RAW);
state = INIT_SELECTING;
break;
case INIT_SELECTING:
break;
}
/* start things over */
packet_num = 0;
/* Kill any timeouts because the user wants this to hurry along */
timeout = 0;
}
/* perform a release */
static void perform_release(void)
{
char buffer[16];
struct in_addr temp_addr;
/* send release packet */
if (state == BOUND || state == RENEWING || state == REBINDING) {
temp_addr.s_addr = server_addr;
sprintf(buffer, "%s", inet_ntoa(temp_addr));
temp_addr.s_addr = requested_ip;
bb_info_msg("Unicasting a release of %s to %s",
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inet_ntoa(temp_addr), buffer);
send_release(server_addr, requested_ip); /* unicast */
udhcp_run_script(NULL, "deconfig");
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}
bb_info_msg("Entering released state");
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change_mode(LISTEN_NONE);
state = RELEASED;
timeout = 0x7fffffff;
}
static void client_background(void)
{
#ifdef __uClinux__
bb_error_msg("cannot background in uclinux (yet)");
/* ... mainly because udhcpc calls client_background()
* in _the _middle _of _udhcpc _run_, not at the start!
* If that will be properly disabled for NOMMU, client_background()
* will work on NOMMU too */
#else
// chdir(/) is problematic. Imagine that e.g. pidfile name is RELATIVE! what will unlink do then, eh?
bb_daemonize(DAEMON_CHDIR_ROOT);
/* rewrite pidfile, as our pid is different now */
if (client_config.pidfile)
write_pidfile(client_config.pidfile);
logmode &= ~LOGMODE_STDIO;
#endif
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client_config.foreground = 1; /* Do not fork again. */
client_config.background_if_no_lease = 0;
}
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static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
{
uint8_t *storage;
int len = strlen(str);
if (len > 255) len = 255;
storage = xzalloc(len + extra + OPT_DATA);
storage[OPT_CODE] = code;
storage[OPT_LEN] = len + extra;
memcpy(storage + extra + OPT_DATA, str, len);
return storage;
}
int udhcpc_main(int argc, char **argv);
int udhcpc_main(int argc, char **argv)
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{
uint8_t *temp, *message;
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char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
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unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease = 0;
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long now;
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unsigned opt;
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int max_fd;
int sig;
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int retval;
int len;
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int no_clientid = 0;
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fd_set rfds;
struct timeval tv;
struct dhcpMessage packet;
struct in_addr temp_addr;
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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
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static const struct option arg_options[] = {
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{ "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 }
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};
#endif
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/* 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
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applet_long_options = arg_options;
#endif
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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;
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}
if (ENABLE_FEATURE_UDHCP_SYSLOG) {
openlog(applet_name, LOG_PID, LOG_LOCAL0);
logmode |= LOGMODE_SYSLOG;
}
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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);
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/* if not set, and not suppressed, setup the default client ID */
if (!client_config.clientid && !no_clientid) {
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client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
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client_config.clientid[OPT_DATA] = 1;
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memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
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}
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if (!client_config.vendorclass)
client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
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/* setup the signal pipe */
udhcp_sp_setup();
state = INIT_SELECTING;
udhcp_run_script(NULL, "deconfig");
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change_mode(LISTEN_RAW);
for (;;) {
tv.tv_sec = timeout - uptime();
tv.tv_usec = 0;
if (listen_mode != LISTEN_NONE && sockfd < 0) {
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if (listen_mode == LISTEN_KERNEL)
sockfd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
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else
sockfd = raw_socket(client_config.ifindex);
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}
max_fd = udhcp_sp_fd_set(&rfds, sockfd);
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if (tv.tv_sec > 0) {
DEBUG("Waiting on select...");
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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");
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if (client_config.background_if_no_lease) {
bb_info_msg("No lease, forking to background");
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client_background();
} else if (client_config.abort_if_no_lease) {
bb_info_msg("No lease, failing");
retval = 1;
goto ret;
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}
/* 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");
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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");
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/* 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");
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} 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");
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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)) {
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/* a packet is ready, read it */
if (listen_mode == LISTEN_KERNEL)
len = udhcp_get_packet(&packet, sockfd);
else len = get_raw_packet(&packet, sockfd);
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if (len == -1 && errno != EINTR) {
DEBUG("error on read, %s, reopening socket", strerror(errno));
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change_mode(listen_mode); /* just close and reopen */
}
if (len < 0) continue;
if (packet.xid != xid) {
DEBUG("Ignoring XID %lx (our xid is %lx)",
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(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");
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continue;
}
message = get_option(&packet, DHCP_MESSAGE_TYPE);
if (message == NULL) {
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bb_error_msg("cannot get option from packet - ignoring");
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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);
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xid = packet.xid;
requested_ip = packet.yiaddr;
/* enter requesting state */
state = REQUESTING;
timeout = now;
packet_num = 0;
} else {
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bb_error_msg("no server ID in message");
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}
}
break;
case RENEW_REQUESTED:
case REQUESTING:
case RENEWING:
case REBINDING:
if (*message == DHCPACK) {
temp = get_option(&packet, DHCP_LEASE_TIME);
if (!temp) {
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bb_error_msg("no lease time with ACK, using 1 hour lease");
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lease = 60 * 60;
} else {
/* can be misaligned, thus memcpy */
memcpy(&lease, temp, 4);
lease = ntohl(lease);
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}
/* 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",
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inet_ntoa(temp_addr), lease);
start = now;
timeout = t1 + start;
requested_ip = packet.yiaddr;
udhcp_run_script(&packet,
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((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
state = BOUND;
change_mode(LISTEN_NONE);
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if (client_config.quit_after_lease) {
if (client_config.release_on_quit)
perform_release();
goto ret0;
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}
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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");
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if (state != REQUESTING)
udhcp_run_script(NULL, "deconfig");
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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))) {
switch (sig) {
case SIGUSR1:
perform_renew();
break;
case SIGUSR2:
perform_release();
break;
case SIGTERM:
bb_info_msg("Received SIGTERM");
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if (client_config.release_on_quit)
perform_release();
goto ret0;
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}
} else if (retval == -1 && errno == EINTR) {
/* a signal was caught */
} else {
/* An error occured */
bb_perror_msg("select");
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}
} /* for (;;) */
ret0:
retval = 0;
ret:
if (client_config.pidfile)
remove_pidfile(client_config.pidfile);
return retval;
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}