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Diffstat (limited to 'networking/udhcp/dhcpc.c')
-rw-r--r--networking/udhcp/dhcpc.c573
1 files changed, 0 insertions, 573 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
deleted file mode 100644
index fe2225a..0000000
--- a/networking/udhcp/dhcpc.c
+++ /dev/null
@@ -1,573 +0,0 @@
-/* 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 <sys/time.h>
-#include <sys/file.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <stdlib.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <signal.h>
-#include <time.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <errno.h>
-
-#include "common.h"
-#include "dhcpd.h"
-#include "dhcpc.h"
-#include "options.h"
-#include "clientpacket.h"
-#include "clientsocket.h"
-#include "script.h"
-#include "socket.h"
-#include "signalpipe.h"
-
-static int state;
-static unsigned long requested_ip; /* = 0 */
-static unsigned long server_addr;
-static unsigned long timeout;
-static int packet_num; /* = 0 */
-static int fd = -1;
-
-#define LISTEN_NONE 0
-#define LISTEN_KERNEL 1
-#define LISTEN_RAW 2
-static int listen_mode;
-
-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,
- .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)
-{
- printf(
-"Usage: udhcpc [OPTIONS]\n\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"
-" -i, --interface=INTERFACE Interface to use (default: eth0)\n"
-" -n, --now Exit with failure if lease cannot be\n"
-" immediately negotiated.\n"
-" -p, --pidfile=file Store process ID of daemon in file\n"
-" -q, --quit Quit after obtaining lease\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"
-" -v, --version Display version\n"
- );
- exit(0);
-}
-#else
-#define show_usage bb_show_usage
-extern void show_usage(void) ATTRIBUTE_NORETURN;
-#endif
-
-
-/* just a little helper */
-static void change_mode(int new_mode)
-{
- DEBUG(LOG_INFO, "entering %s listen mode",
- new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
- if (fd >= 0) close(fd);
- fd = -1;
- listen_mode = new_mode;
-}
-
-
-/* perform a renew */
-static void perform_renew(void)
-{
- LOG(LOG_INFO, "Performing a DHCP renew");
- 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 */
- run_script(NULL, "deconfig");
- 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;
- 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");
- }
- LOG(LOG_INFO, "Entering released state");
-
- change_mode(LISTEN_NONE);
- state = RELEASED;
- timeout = 0x7fffffff;
-}
-
-
-static void client_background(void)
-{
- background(client_config.pidfile);
- client_config.foreground = 1; /* Do not fork again. */
- client_config.background_if_no_lease = 0;
-}
-
-
-#ifdef COMBINED_BINARY
-int udhcpc_main(int argc, char *argv[])
-#else
-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;
-
- 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'},
- {"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}
- };
-
- /* get options */
- while (1) {
- int option_index = 0;
- 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);
- 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((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;
- break;
- case 'b':
- client_config.background_if_no_lease = 1;
- break;
- case 'h':
- case 'H':
- len = strlen(optarg) > 255 ? 255 : strlen(optarg);
- 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((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;
- 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 'T':
- client_config.timeout = atoi(optarg);
- break;
- case 't':
- client_config.retries = atoi(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 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);
- }
-
- if (!client_config.vendorclass) {
- client_config.vendorclass = xmalloc(sizeof("udhcp "VERSION) + 2);
- client_config.vendorclass[OPT_CODE] = DHCP_VENDOR;
- client_config.vendorclass[OPT_LEN] = sizeof("udhcp "VERSION) - 1;
- client_config.vendorclass[OPT_DATA] = 1;
- memcpy(&client_config.vendorclass[OPT_DATA],
- "udhcp "VERSION, sizeof("udhcp "VERSION) - 1);
- }
-
-
- /* setup the signal pipe */
- udhcp_sp_setup();
-
- 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;
- }
- }
- 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 = 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 {
- 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 < 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");
- 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;
- }
-
- /* 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;
-
- /* 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))) {
- switch (sig) {
- case SIGUSR1:
- perform_renew();
- break;
- case SIGUSR2:
- perform_release();
- break;
- case SIGTERM:
- LOG(LOG_INFO, "Received SIGTERM");
- return 0;
- }
- } else if (retval == -1 && errno == EINTR) {
- /* a signal was caught */
- } else {
- /* An error occured */
- DEBUG(LOG_ERR, "Error on select");
- }
-
- }
- return 0;
-}
generated by cgit v1.1 at 2024-11-05 23:48:43 +0000