*
* Russ Dill <Russ.Dill@asu.edu> July 2001
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
-
-#include <stdio.h>
-#include <sys/time.h>
-#include <sys/types.h>
+
#include <sys/file.h>
#include <unistd.h>
#include <getopt.h>
#include <net/if.h>
#include <errno.h>
+#include "common.h"
#include "dhcpd.h"
#include "dhcpc.h"
#include "options.h"
#include "clientpacket.h"
-#include "packet.h"
-#include "script.h"
+#include "clientsocket.h"
#include "socket.h"
-#include "debug.h"
-#include "pidfile.h"
+#include "signalpipe.h"
static int state;
static unsigned long requested_ip; /* = 0 */
static unsigned long timeout;
static int packet_num; /* = 0 */
static int fd = -1;
-static int signal_pipe[2];
#define LISTEN_NONE 0
#define LISTEN_KERNEL 1
#define LISTEN_RAW 2
static int listen_mode;
-#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
-
struct client_config_t client_config = {
/* Default options. */
- abort_if_no_lease: 0,
- foreground: 0,
- quit_after_lease: 0,
- background_if_no_lease: 0,
- interface: "eth0",
- pidfile: NULL,
- script: DEFAULT_SCRIPT,
- clientid: NULL,
- hostname: NULL,
- ifindex: 0,
- arp: "\0\0\0\0\0\0", /* appease gcc-3.0 */
+ .abort_if_no_lease = 0,
+ .foreground = 0,
+ .quit_after_lease = 0,
+ .background_if_no_lease = 0,
+ .interface = "eth0",
+ .pidfile = NULL,
+ .script = DEFAULT_SCRIPT,
+ .clientid = NULL,
+ .vendorclass = NULL,
+ .hostname = NULL,
+ .fqdn = NULL,
+ .ifindex = 0,
+ .retries = 3,
+ .timeout = 3,
+ .arp = "\0\0\0\0\0\0", /* appease gcc-3.0 */
};
#ifndef IN_BUSYBOX
-static void __attribute__ ((noreturn)) show_usage(void)
+static void ATTRIBUTE_NORETURN show_usage(void)
{
printf(
"Usage: udhcpc [OPTIONS]\n\n"
-" -c, --clientid=CLIENTID Client identifier\n"
+" -c, --clientid=CLIENTID Set client identifier - type is first char\n"
+" -C, --clientid-none Suppress default client identifier\n"
+" -V, --vendorclass=CLASSID Set vendor class identifier\n"
" -H, --hostname=HOSTNAME Client hostname\n"
" -h Alias for -H\n"
+" -F, --fqdn=FQDN Client fully qualified domain name\n"
" -f, --foreground Do not fork after getting lease\n"
" -b, --background Fork to background if lease cannot be\n"
" immediately negotiated.\n"
" -r, --request=IP IP address to request (default: none)\n"
" -s, --script=file Run file at dhcp events (default:\n"
" " DEFAULT_SCRIPT ")\n"
+" -T, --timeout=seconds Try to get the lease for the amount of\n"
+" seconds (default: 3)\n"
+" -t, --retries=NUM Send up to NUM request packets\n"
" -v, --version Display version\n"
);
exit(0);
}
#else
-extern void show_usage(void) __attribute__ ((noreturn));
+#define show_usage bb_show_usage
+extern void show_usage(void) ATTRIBUTE_NORETURN;
#endif
state = RENEW_REQUESTED;
break;
case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
- run_script(NULL, "deconfig");
+ udhcp_run_script(NULL, "deconfig");
case REQUESTING:
case RELEASED:
change_mode(LISTEN_RAW);
state = INIT_SELECTING;
break;
case INIT_SELECTING:
+ break;
}
/* start things over */
temp_addr.s_addr = server_addr;
sprintf(buffer, "%s", inet_ntoa(temp_addr));
temp_addr.s_addr = requested_ip;
- LOG(LOG_INFO, "Unicasting a release of %s to %s",
+ LOG(LOG_INFO, "Unicasting a release of %s to %s",
inet_ntoa(temp_addr), buffer);
send_release(server_addr, requested_ip); /* unicast */
- run_script(NULL, "deconfig");
+ udhcp_run_script(NULL, "deconfig");
}
LOG(LOG_INFO, "Entering released state");
}
-/* Exit and cleanup */
-static void exit_client(int retval)
-{
- pidfile_delete(client_config.pidfile);
- CLOSE_LOG();
- exit(retval);
-}
-
-
-/* Signal handler */
-static void signal_handler(int sig)
-{
- if (send(signal_pipe[1], &sig, sizeof(sig), MSG_DONTWAIT) < 0) {
- LOG(LOG_ERR, "Could not send signal: %s",
- strerror(errno));
- }
-}
-
-
-static void background(void)
+static void client_background(void)
{
- int pid_fd;
-
- pid_fd = pidfile_acquire(client_config.pidfile); /* hold lock during fork. */
- while (pid_fd >= 0 && pid_fd < 3) pid_fd = dup(pid_fd); /* don't let daemon close it */
- if (daemon(0, 0) == -1) {
- perror("fork");
- exit_client(1);
- }
+ udhcp_background(client_config.pidfile);
client_config.foreground = 1; /* Do not fork again. */
client_config.background_if_no_lease = 0;
- pidfile_write_release(pid_fd);
}
int main(int argc, char *argv[])
#endif
{
- unsigned char *temp, *message;
+ uint8_t *temp, *message;
unsigned long t1 = 0, t2 = 0, xid = 0;
unsigned long start = 0, lease;
fd_set rfds;
int c, len;
struct dhcpMessage packet;
struct in_addr temp_addr;
- int pid_fd;
- time_t now;
+ long now;
int max_fd;
int sig;
+ int no_clientid = 0;
- static struct option arg_options[] = {
+ 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'},
+ {"hostname", required_argument, 0, 'h'},
+ {"fqdn", required_argument, 0, 'F'},
{"interface", required_argument, 0, 'i'},
- {"now", no_argument, 0, 'n'},
+ {"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'},
+ {"timeout", required_argument, 0, 'T'},
{"version", no_argument, 0, 'v'},
- {"help", no_argument, 0, '?'},
+ {"retries", required_argument, 0, 't'},
{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);
+ c = getopt_long(argc, argv, "c:CV:fbH:h:F:i:np:qr:s:T:t:v", 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);
+ 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);
+ strncpy((char*)client_config.clientid + OPT_DATA, optarg, len);
+ break;
+ case 'C':
+ if (client_config.clientid) show_usage();
+ no_clientid = 1;
+ break;
+ case 'V':
+ len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+ free(client_config.vendorclass);
+ client_config.vendorclass = xmalloc(len + 2);
+ client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
+ client_config.vendorclass[OPT_LEN] = len;
+ strncpy((char*)client_config.vendorclass + OPT_DATA, optarg, len);
break;
case 'f':
client_config.foreground = 1;
case 'h':
case 'H':
len = strlen(optarg) > 255 ? 255 : strlen(optarg);
- if (client_config.hostname) free(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);
+ strncpy((char*)client_config.hostname + 2, optarg, len);
+ break;
+ case 'F':
+ len = strlen(optarg) > 255 ? 255 : strlen(optarg);
+ free(client_config.fqdn);
+ client_config.fqdn = xmalloc(len + 5);
+ client_config.fqdn[OPT_CODE] = DHCP_FQDN;
+ client_config.fqdn[OPT_LEN] = len + 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_LEN + 1] = 0x1;
+ client_config.fqdn[OPT_LEN + 2] = 0;
+ client_config.fqdn[OPT_LEN + 3] = 0;
+ strncpy((char*)client_config.fqdn + 5, optarg, len);
break;
case 'i':
client_config.interface = optarg;
case 's':
client_config.script = optarg;
break;
+ case 'T':
+ client_config.timeout = atoi(optarg);
+ break;
+ case 't':
+ client_config.retries = atoi(optarg);
+ break;
case 'v':
- printf("udhcpcd, version %s\n\n", VERSION);
- exit_client(0);
+ printf("version %s\n\n", BB_VER);
+ return 0;
break;
default:
show_usage();
}
}
- OPEN_LOG("udhcpc");
- LOG(LOG_INFO, "udhcp client (v%s) started", VERSION);
+ /* Start the log, sanitize fd's, and write a pid file */
+ udhcp_start_log_and_pid("udhcpc", client_config.pidfile);
- pid_fd = pidfile_acquire(client_config.pidfile);
- pidfile_write_release(pid_fd);
-
- if (read_interface(client_config.interface, &client_config.ifindex,
+ if (read_interface(client_config.interface, &client_config.ifindex,
NULL, client_config.arp) < 0)
- exit_client(1);
-
- if (!client_config.clientid) {
+ 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;
memcpy(client_config.clientid + 3, client_config.arp, 6);
}
- /* setup signal handlers */
- socketpair(AF_UNIX, SOCK_STREAM, 0, signal_pipe);
- signal(SIGUSR1, signal_handler);
- signal(SIGUSR2, signal_handler);
- signal(SIGTERM, signal_handler);
-
+ if (!client_config.vendorclass) {
+ client_config.vendorclass = xmalloc(sizeof("udhcp "BB_VER) + 2);
+ client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
+ client_config.vendorclass[OPT_LEN] = sizeof("udhcp "BB_VER) - 1;
+ client_config.vendorclass[OPT_DATA] = 1;
+ memcpy(&client_config.vendorclass[OPT_DATA],
+ "udhcp "BB_VER, sizeof("udhcp "BB_VER) - 1);
+ }
+
+
+ /* setup the signal pipe */
+ udhcp_sp_setup();
+
state = INIT_SELECTING;
- run_script(NULL, "deconfig");
+ udhcp_run_script(NULL, "deconfig");
change_mode(LISTEN_RAW);
for (;;) {
- tv.tv_sec = timeout - time(0);
+ tv.tv_sec = timeout - uptime();
tv.tv_usec = 0;
- FD_ZERO(&rfds);
if (listen_mode != LISTEN_NONE && fd < 0) {
if (listen_mode == LISTEN_KERNEL)
else
fd = raw_socket(client_config.ifindex);
if (fd < 0) {
- LOG(LOG_ERR, "FATAL: couldn't listen on socket, %s", strerror(errno));
- exit_client(0);
+ LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m");
+ return 0;
}
}
- if (fd >= 0) FD_SET(fd, &rfds);
- FD_SET(signal_pipe[0], &rfds);
+ max_fd = udhcp_sp_fd_set(&rfds, fd);
if (tv.tv_sec > 0) {
- DEBUG(LOG_INFO, "Waiting on select...\n");
- max_fd = signal_pipe[0] > fd ? signal_pipe[0] : fd;
+ 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);
+ now = uptime();
if (retval == 0) {
/* timeout dropped to zero */
switch (state) {
case INIT_SELECTING:
- if (packet_num < 3) {
+ if (packet_num < client_config.retries) {
if (packet_num == 0)
xid = random_xid();
/* send discover packet */
send_discover(xid, requested_ip); /* broadcast */
-
- timeout = now + ((packet_num == 2) ? 4 : 2);
+
+ timeout = now + client_config.timeout;
packet_num++;
} else {
+ udhcp_run_script(NULL, "leasefail");
if (client_config.background_if_no_lease) {
LOG(LOG_INFO, "No lease, forking to background.");
- background();
+ client_background();
} else if (client_config.abort_if_no_lease) {
LOG(LOG_INFO, "No lease, failing.");
- exit_client(1);
- }
+ return 1;
+ }
/* wait to try again */
packet_num = 0;
timeout = now + 60;
break;
case RENEW_REQUESTED:
case REQUESTING:
- if (packet_num < 3) {
+ 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) run_script(NULL, "deconfig");
+ if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
packet_num = 0;
} else {
/* send a request packet */
send_renew(xid, server_addr, requested_ip); /* unicast */
-
+
t1 = (t2 - t1) / 2 + t1;
timeout = t1 + start;
}
/* timed out, enter init state */
state = INIT_SELECTING;
LOG(LOG_INFO, "Lease lost, entering init state");
- run_script(NULL, "deconfig");
+ udhcp_run_script(NULL, "deconfig");
timeout = now;
packet_num = 0;
change_mode(LISTEN_RAW);
}
} 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);
+ len = udhcp_get_packet(&packet, fd);
else len = get_raw_packet(&packet, fd);
-
+
if (len == -1 && errno != EINTR) {
- DEBUG(LOG_INFO, "error on read, %s, reopening socket", strerror(errno));
+ 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 */
memcpy(&server_addr, temp, 4);
xid = packet.xid;
requested_ip = packet.yiaddr;
-
+
/* enter requesting state */
state = REQUESTING;
timeout = now;
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",
+ 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,
+ udhcp_run_script(&packet,
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
state = BOUND;
change_mode(LISTEN_NONE);
- if (client_config.quit_after_lease)
- exit_client(0);
+ if (client_config.quit_after_lease)
+ return 0;
if (!client_config.foreground)
- background();
+ client_background();
} else if (*message == DHCPNAK) {
/* return to init state */
LOG(LOG_INFO, "Received DHCP NAK");
- run_script(&packet, "nak");
+ udhcp_run_script(&packet, "nak");
if (state != REQUESTING)
- run_script(NULL, "deconfig");
+ udhcp_run_script(NULL, "deconfig");
state = INIT_SELECTING;
timeout = now;
requested_ip = 0;
}
break;
/* case BOUND, RELEASED: - ignore all packets */
- }
- } else if (retval > 0 && FD_ISSET(signal_pipe[0], &rfds)) {
- if (read(signal_pipe[0], &sig, sizeof(sig)) < 0) {
- DEBUG(LOG_ERR, "Could not read signal: %s",
- strerror(errno));
- continue; /* probably just EINTR */
}
+ } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
switch (sig) {
- case SIGUSR1:
+ case SIGUSR1:
perform_renew();
break;
case SIGUSR2:
break;
case SIGTERM:
LOG(LOG_INFO, "Received SIGTERM");
- exit_client(0);
+ return 0;
}
} else if (retval == -1 && errno == EINTR) {
- /* a signal was caught */
+ /* a signal was caught */
} else {
/* An error occured */
DEBUG(LOG_ERR, "Error on select");
}
-
+
}
return 0;
}
-
projects / oweals / busybox.git / blobdiff