fc9e108032
udhcpc: guard against zero lease time function old new delta timeout 4 - -4 server_addr 4 - -4 requested_ip 4 - -4 perform_release 134 112 -22 udhcpc_main 2511 2485 -26 ------------------------------------------------------------------------------ (add/remove: 0/3 grow/shrink: 0/2 up/down: 0/-60) Total: -60 bytes
650 lines
18 KiB
C
650 lines
18 KiB
C
/* vi: set sw=4 ts=4: */
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/* dhcpc.c
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*
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* udhcp DHCP client
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*
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* Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include <syslog.h>
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/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
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#define WANT_PIDFILE 1
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#include "common.h"
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#include "dhcpd.h"
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#include "dhcpc.h"
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#include "options.h"
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static int sockfd = -1;
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#define LISTEN_NONE 0
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#define LISTEN_KERNEL 1
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#define LISTEN_RAW 2
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static smallint listen_mode;
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#define INIT_SELECTING 0
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#define REQUESTING 1
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#define BOUND 2
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#define RENEWING 3
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#define REBINDING 4
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#define INIT_REBOOT 5
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#define RENEW_REQUESTED 6
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#define RELEASED 7
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static smallint state;
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/* struct client_config_t client_config is in bb_common_bufsiz1 */
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/* just a little helper */
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static void change_listen_mode(int new_mode)
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{
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DEBUG("entering %s listen mode",
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new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
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if (sockfd >= 0) {
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close(sockfd);
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sockfd = -1;
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}
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listen_mode = new_mode;
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}
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/* perform a renew */
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static void perform_renew(void)
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{
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bb_info_msg("Performing a DHCP renew");
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switch (state) {
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case BOUND:
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change_listen_mode(LISTEN_KERNEL);
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case RENEWING:
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case REBINDING:
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state = RENEW_REQUESTED;
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break;
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case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
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udhcp_run_script(NULL, "deconfig");
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case REQUESTING:
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case RELEASED:
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change_listen_mode(LISTEN_RAW);
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state = INIT_SELECTING;
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break;
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case INIT_SELECTING:
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break;
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}
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}
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/* perform a release */
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static void perform_release(uint32_t requested_ip, uint32_t server_addr)
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{
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char buffer[sizeof("255.255.255.255")];
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struct in_addr temp_addr;
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/* send release packet */
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if (state == BOUND || state == RENEWING || state == REBINDING) {
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temp_addr.s_addr = server_addr;
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strcpy(buffer, inet_ntoa(temp_addr));
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temp_addr.s_addr = requested_ip;
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bb_info_msg("Unicasting a release of %s to %s",
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inet_ntoa(temp_addr), buffer);
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send_release(server_addr, requested_ip); /* unicast */
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udhcp_run_script(NULL, "deconfig");
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}
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bb_info_msg("Entering released state");
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change_listen_mode(LISTEN_NONE);
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state = RELEASED;
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}
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static void client_background(void)
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{
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#if !BB_MMU
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bb_error_msg("cannot background in uclinux (yet)");
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/* ... mainly because udhcpc calls client_background()
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* in _the _middle _of _udhcpc _run_, not at the start!
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* If that will be properly disabled for NOMMU, client_background()
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* will work on NOMMU too */
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#else
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bb_daemonize(0);
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logmode &= ~LOGMODE_STDIO;
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/* rewrite pidfile, as our pid is different now */
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write_pidfile(client_config.pidfile);
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#endif
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/* Do not fork again. */
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client_config.foreground = 1;
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client_config.background_if_no_lease = 0;
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}
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static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
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{
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uint8_t *storage;
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int len = strlen(str);
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if (len > 255) len = 255;
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storage = xzalloc(len + extra + OPT_DATA);
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storage[OPT_CODE] = code;
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storage[OPT_LEN] = len + extra;
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memcpy(storage + extra + OPT_DATA, str, len);
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return storage;
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}
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int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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uint8_t *temp, *message;
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char *str_c, *str_V, *str_h, *str_F, *str_r;
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USE_FEATURE_UDHCP_PORT(char *str_P;)
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llist_t *list_O = NULL;
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#if ENABLE_FEATURE_UDHCPC_ARPING
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char *str_W;
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#endif
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int tryagain_timeout = 20;
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int discover_timeout = 3;
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int discover_retries = 3;
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uint32_t server_addr = server_addr; /* for compiler */
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uint32_t requested_ip = 0;
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uint32_t xid = 0;
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uint32_t lease_seconds = 0; /* can be given as 32-bit quantity */
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int packet_num;
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int timeout; /* must be signed */
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unsigned already_waited_sec;
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unsigned opt;
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int max_fd;
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int retval;
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struct timeval tv;
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struct dhcpMessage packet;
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fd_set rfds;
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enum {
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OPT_c = 1 << 0,
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OPT_C = 1 << 1,
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OPT_V = 1 << 2,
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OPT_f = 1 << 3,
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OPT_b = 1 << 4,
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OPT_H = 1 << 5,
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OPT_h = 1 << 6,
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OPT_F = 1 << 7,
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OPT_i = 1 << 8,
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OPT_n = 1 << 9,
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OPT_p = 1 << 10,
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OPT_q = 1 << 11,
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OPT_R = 1 << 12,
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OPT_r = 1 << 13,
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OPT_s = 1 << 14,
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OPT_T = 1 << 15,
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OPT_t = 1 << 16,
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OPT_v = 1 << 17,
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OPT_S = 1 << 18,
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OPT_A = 1 << 19,
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#if ENABLE_FEATURE_UDHCPC_ARPING
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OPT_a = 1 << 20,
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OPT_W = 1 << 21,
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#endif
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OPT_P = 1 << 22,
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OPT_o = 1 << 23,
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};
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#if ENABLE_GETOPT_LONG
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static const char udhcpc_longopts[] ALIGN1 =
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"clientid\0" Required_argument "c"
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"clientid-none\0" No_argument "C"
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"vendorclass\0" Required_argument "V"
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"foreground\0" No_argument "f"
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"background\0" No_argument "b"
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"hostname\0" Required_argument "H"
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"fqdn\0" Required_argument "F"
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"interface\0" Required_argument "i"
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"now\0" No_argument "n"
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"pidfile\0" Required_argument "p"
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"quit\0" No_argument "q"
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"release\0" No_argument "R"
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"request\0" Required_argument "r"
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"script\0" Required_argument "s"
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"timeout\0" Required_argument "T"
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"version\0" No_argument "v"
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"retries\0" Required_argument "t"
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"tryagain\0" Required_argument "A"
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"syslog\0" No_argument "S"
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#if ENABLE_FEATURE_UDHCPC_ARPING
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"arping\0" No_argument "a"
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#endif
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"request-option\0" Required_argument "O"
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#if ENABLE_FEATURE_UDHCP_PORT
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"client-port\0" Required_argument "P"
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#endif
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"no-default-options\0" No_argument "o"
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;
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#endif
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/* Default options. */
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#if ENABLE_FEATURE_UDHCP_PORT
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SERVER_PORT = 67;
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CLIENT_PORT = 68;
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#endif
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client_config.interface = "eth0";
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client_config.script = DEFAULT_SCRIPT;
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/* Parse command line */
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/* Cc: mutually exclusive; O: list; -T,-t,-A take numeric param */
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opt_complementary = "c--C:C--c:O::T+:t+:A+";
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#if ENABLE_GETOPT_LONG
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applet_long_options = udhcpc_longopts;
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#endif
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opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:"
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USE_FEATURE_UDHCPC_ARPING("aW:")
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USE_FEATURE_UDHCP_PORT("P:")
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"O:o"
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, &str_c, &str_V, &str_h, &str_h, &str_F
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, &client_config.interface, &client_config.pidfile, &str_r
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, &client_config.script
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, &discover_timeout, &discover_retries, &tryagain_timeout
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USE_FEATURE_UDHCPC_ARPING(, &str_W)
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USE_FEATURE_UDHCP_PORT(, &str_P)
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, &list_O
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);
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if (opt & OPT_c)
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client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
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//if (opt & OPT_C)
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if (opt & OPT_V)
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client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
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if (opt & OPT_f)
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client_config.foreground = 1;
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if (opt & OPT_b)
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client_config.background_if_no_lease = 1;
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if (opt & (OPT_h|OPT_H))
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client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0);
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if (opt & OPT_F) {
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client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3);
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/* Flags: 0000NEOS
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S: 1 => Client requests Server to update A RR in DNS as well as PTR
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O: 1 => Server indicates to client that DNS has been updated regardless
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E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
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N: 1 => Client requests Server to not update DNS
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*/
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client_config.fqdn[OPT_DATA + 0] = 0x1;
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/* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */
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/* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */
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}
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// if (opt & OPT_i) client_config.interface = ...
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if (opt & OPT_n)
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client_config.abort_if_no_lease = 1;
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// if (opt & OPT_p) client_config.pidfile = ...
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if (opt & OPT_q)
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client_config.quit_after_lease = 1;
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if (opt & OPT_R)
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client_config.release_on_quit = 1;
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if (opt & OPT_r)
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requested_ip = inet_addr(str_r);
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// if (opt & OPT_s) client_config.script = ...
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// if (opt & OPT_T) discover_timeout = xatoi_u(str_T);
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// if (opt & OPT_t) discover_retries = xatoi_u(str_t);
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// if (opt & OPT_A) tryagain_timeout = xatoi_u(str_A);
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if (opt & OPT_v) {
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puts("version "BB_VER);
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return 0;
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}
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if (opt & OPT_S) {
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openlog(applet_name, LOG_PID, LOG_LOCAL0);
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logmode |= LOGMODE_SYSLOG;
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}
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#if ENABLE_FEATURE_UDHCP_PORT
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if (opt & OPT_P) {
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CLIENT_PORT = xatou16(str_P);
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SERVER_PORT = CLIENT_PORT - 1;
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}
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#endif
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if (opt & OPT_o)
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client_config.no_default_options = 1;
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while (list_O) {
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int n = index_in_strings(dhcp_option_strings, list_O->data);
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if (n < 0)
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bb_error_msg_and_die("unknown option '%s'", list_O->data);
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n = dhcp_options[n].code;
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client_config.opt_mask[n >> 3] |= 1 << (n & 7);
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list_O = list_O->link;
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}
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if (read_interface(client_config.interface, &client_config.ifindex,
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NULL, client_config.arp))
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return 1;
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/* Make sure fd 0,1,2 are open */
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bb_sanitize_stdio();
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/* Equivalent of doing a fflush after every \n */
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setlinebuf(stdout);
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/* Create pidfile */
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write_pidfile(client_config.pidfile);
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/* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */
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/* Goes to stdout and possibly syslog */
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bb_info_msg("%s (v"BB_VER") started", applet_name);
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/* if not set, and not suppressed, setup the default client ID */
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if (!client_config.clientid && !(opt & OPT_C)) {
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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)
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client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
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/* setup the signal pipe */
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udhcp_sp_setup();
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state = INIT_SELECTING;
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udhcp_run_script(NULL, "deconfig");
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change_listen_mode(LISTEN_RAW);
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packet_num = 0;
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timeout = 0;
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already_waited_sec = 0;
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/* Main event loop. select() waits on signal pipe and possibly
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* on sockfd.
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* "continue" statements in code below jump to the top of the loop.
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*/
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for (;;) {
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unsigned timestamp_before_wait;
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if (listen_mode != LISTEN_NONE && sockfd < 0) {
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if (listen_mode == LISTEN_KERNEL)
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sockfd = listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
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else
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sockfd = raw_socket(client_config.ifindex);
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}
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max_fd = udhcp_sp_fd_set(&rfds, sockfd);
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tv.tv_sec = timeout - already_waited_sec;
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tv.tv_usec = 0;
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retval = 0; /* If we already timed out, fall through, else... */
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if (tv.tv_sec > 0) {
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timestamp_before_wait = (unsigned)monotonic_sec();
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DEBUG("Waiting on select...");
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retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
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if (retval < 0) {
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/* EINTR? A signal was caught, don't panic */
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if (errno == EINTR)
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continue;
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/* Else: an error occured, panic! */
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bb_perror_msg_and_die("select");
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}
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}
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/* If timeout dropped to zero, time to become active:
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* resend discover/renew/whatever
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*/
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if (retval == 0) {
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/* We will restart wait afresh in any case */
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already_waited_sec = 0;
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switch (state) {
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case INIT_SELECTING:
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if (packet_num < discover_retries) {
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if (packet_num == 0)
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xid = random_xid();
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send_discover(xid, requested_ip); /* broadcast */
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timeout = discover_timeout;
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packet_num++;
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continue;
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}
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udhcp_run_script(NULL, "leasefail");
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if (client_config.background_if_no_lease) {
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bb_info_msg("No lease, forking to background");
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client_background();
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} else if (client_config.abort_if_no_lease) {
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bb_info_msg("No lease, failing");
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retval = 1;
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goto ret;
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}
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/* wait before trying again */
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timeout = tryagain_timeout;
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packet_num = 0;
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continue;
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case RENEW_REQUESTED:
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case REQUESTING:
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if (packet_num < discover_retries) {
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/* send request packet */
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if (state == RENEW_REQUESTED) /* unicast */
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send_renew(xid, server_addr, requested_ip);
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else /* broadcast */
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send_selecting(xid, server_addr, requested_ip);
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timeout = discover_timeout;
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packet_num++;
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continue;
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}
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/* timed out, go back to init state */
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if (state == RENEW_REQUESTED)
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udhcp_run_script(NULL, "deconfig");
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change_listen_mode(LISTEN_RAW);
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state = INIT_SELECTING;
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timeout = 0;
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packet_num = 0;
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continue;
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case BOUND:
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/* Half of the lease passed, time to enter renewing state */
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change_listen_mode(LISTEN_KERNEL);
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DEBUG("Entering renew state");
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state = RENEWING;
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/* fall right through */
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case RENEWING:
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if (timeout > 60) {
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/* send a request packet */
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send_renew(xid, server_addr, requested_ip); /* unicast */
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timeout >>= 1;
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continue;
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}
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/* Timed out, enter rebinding state */
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DEBUG("Entering rebinding state");
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state = REBINDING;
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/* fall right through */
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case REBINDING:
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/* Lease is *really* about to run out,
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* try to find DHCP server using broadcast */
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if (timeout > 0) {
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/* send a request packet */
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send_renew(xid, 0, requested_ip); /* broadcast */
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timeout >>= 1;
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continue;
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}
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/* Timed out, enter init state */
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bb_info_msg("Lease lost, entering init state");
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udhcp_run_script(NULL, "deconfig");
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change_listen_mode(LISTEN_RAW);
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state = INIT_SELECTING;
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/*timeout = 0; - already is */
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packet_num = 0;
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continue;
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/* case RELEASED: */
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}
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/* yah, I know, *you* say it would never happen */
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timeout = INT_MAX;
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continue; /* back to main loop */
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}
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/* select() didn't timeout, something did happen. */
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/* Is is a packet? */
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if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
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int len;
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/* A packet is ready, read it */
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if (listen_mode == LISTEN_KERNEL)
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len = udhcp_recv_kernel_packet(&packet, sockfd);
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else
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len = udhcp_recv_raw_packet(&packet, sockfd);
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if (len == -1) { /* error is severe, reopen socket */
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DEBUG("error on read, %s, reopening socket", strerror(errno));
|
|
sleep(discover_timeout); /* 3 seconds by default */
|
|
change_listen_mode(listen_mode); /* just close and reopen */
|
|
}
|
|
/* If this packet will turn out to be unrelated/bogus,
|
|
* we will go back and wait for next one.
|
|
* Be sure timeout is properly decreased. */
|
|
already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait;
|
|
if (len < 0)
|
|
continue;
|
|
|
|
if (packet.xid != xid) {
|
|
DEBUG("Ignoring XID %x (our xid is %x)",
|
|
(unsigned)packet.xid, (unsigned)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 message type from packet - ignoring");
|
|
continue;
|
|
}
|
|
|
|
switch (state) {
|
|
case INIT_SELECTING:
|
|
/* Must be a DHCPOFFER to one of our xid's */
|
|
if (*message == DHCPOFFER) {
|
|
/* TODO: why we don't just fetch server's IP from IP header? */
|
|
temp = get_option(&packet, DHCP_SERVER_ID);
|
|
if (!temp) {
|
|
bb_error_msg("no server ID in message");
|
|
continue;
|
|
/* still selecting - this server looks bad */
|
|
}
|
|
/* it IS unaligned sometimes, don't "optimize" */
|
|
server_addr = get_unaligned_u32p((uint32_t*)temp);
|
|
xid = packet.xid;
|
|
requested_ip = packet.yiaddr;
|
|
|
|
/* enter requesting state */
|
|
state = REQUESTING;
|
|
timeout = 0;
|
|
packet_num = 0;
|
|
already_waited_sec = 0;
|
|
}
|
|
continue;
|
|
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_seconds = 60 * 60;
|
|
} else {
|
|
/* can be misaligned, thus memcpy */
|
|
memcpy(&lease_seconds, temp, 4);
|
|
lease_seconds = ntohl(lease_seconds);
|
|
lease_seconds &= 0x0fffffff; /* paranoia: must not be prone to overflows */
|
|
if (lease_seconds < 10) /* and not too small */
|
|
lease_seconds = 10;
|
|
}
|
|
#if ENABLE_FEATURE_UDHCPC_ARPING
|
|
if (opt & OPT_a) {
|
|
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_listen_mode(LISTEN_RAW);
|
|
state = INIT_SELECTING;
|
|
requested_ip = 0;
|
|
timeout = tryagain_timeout;
|
|
packet_num = 0;
|
|
already_waited_sec = 0;
|
|
continue; /* back to main loop */
|
|
}
|
|
}
|
|
#endif
|
|
/* enter bound state */
|
|
timeout = lease_seconds / 2;
|
|
{
|
|
struct in_addr temp_addr;
|
|
temp_addr.s_addr = packet.yiaddr;
|
|
bb_info_msg("Lease of %s obtained, lease time %u",
|
|
inet_ntoa(temp_addr), (unsigned)lease_seconds);
|
|
}
|
|
requested_ip = packet.yiaddr;
|
|
udhcp_run_script(&packet,
|
|
((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
|
|
|
|
state = BOUND;
|
|
change_listen_mode(LISTEN_NONE);
|
|
if (client_config.quit_after_lease) {
|
|
if (client_config.release_on_quit)
|
|
perform_release(requested_ip, server_addr);
|
|
goto ret0;
|
|
}
|
|
if (!client_config.foreground)
|
|
client_background();
|
|
|
|
already_waited_sec = 0;
|
|
continue; /* back to main loop */
|
|
}
|
|
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");
|
|
change_listen_mode(LISTEN_RAW);
|
|
sleep(3); /* avoid excessive network traffic */
|
|
state = INIT_SELECTING;
|
|
requested_ip = 0;
|
|
timeout = 0;
|
|
packet_num = 0;
|
|
already_waited_sec = 0;
|
|
}
|
|
continue;
|
|
/* case BOUND, RELEASED: - ignore all packets */
|
|
}
|
|
continue; /* back to main loop */
|
|
}
|
|
|
|
/* select() didn't timeout, something did happen.
|
|
* But it wasn't a packet. It's a signal pipe then. */
|
|
{
|
|
int signo = udhcp_sp_read(&rfds);
|
|
switch (signo) {
|
|
case SIGUSR1:
|
|
perform_renew();
|
|
/* start things over */
|
|
packet_num = 0;
|
|
/* Kill any timeouts because the user wants this to hurry along */
|
|
timeout = 0;
|
|
break;
|
|
case SIGUSR2:
|
|
perform_release(requested_ip, server_addr);
|
|
timeout = INT_MAX;
|
|
break;
|
|
case SIGTERM:
|
|
bb_info_msg("Received SIGTERM");
|
|
if (client_config.release_on_quit)
|
|
perform_release(requested_ip, server_addr);
|
|
goto ret0;
|
|
}
|
|
}
|
|
} /* for (;;) - main loop ends */
|
|
|
|
ret0:
|
|
retval = 0;
|
|
ret:
|
|
/*if (client_config.pidfile) - remove_pidfile has its own check */
|
|
remove_pidfile(client_config.pidfile);
|
|
return retval;
|
|
}
|