source: branches/stable/mindi-busybox/networking/udhcp/dhcpc.c

Last change on this file was 1770, checked in by Bruno Cornec, 13 years ago
  • Better output for mindi-busybox revision
  • Remove dummy file created on NFS - report from Arnaud Tiger <arnaud.tiger_at_hp.com>
  • strace useful for debug
  • fix new versions for pb (2.0.0 for mindi and 1.7.2 for mindi-busybox)
  • fix build process for mindi-busybox + options used in that version (dd for label-partitions-as-necessary)
  • fix typo in label-partitions-as-necessary which doesn't seem to work
  • Update to busybox 1.7.2
  • perl is now required at restore time to support uuid swap partitions (and will be used for many other thigs

in the future for sure)

  • next mindi version will be 2.0.0 due to all the changes made in it (udev may break working distros)
  • small optimization in mindi on keyboard handling (one single find instead of multiple)
  • better interaction for USB device when launching mindi manually
  • attempt to automatically guess block disk size for ramdisk
  • fix typos in bkphw
  • Fix the remaining problem with UUID support for swap partitions
  • Updates mondoarchive man page for USB support
  • Adds preliminary Hardware support to mindi (Proliant SSSTK)
  • Tries to add udev support also for rhel4
  • Fix UUID support which was still broken.
  • Be conservative in test for the start-nfs script
  • Update config file for mindi-busybox for 1.7.2 migration
  • Try to run around a busybox bug (1.2.2 pb on inexistant links)
  • Add build content for mindi-busybox in pb
  • Remove distributions content for mindi-busybox
  • Fix a warning on inexistant raidtab
  • Solve problem on tmpfs in restore init (Problem of inexistant symlink and busybox)
  • Create MONDO_CACHE and use it everywhere + creation at start
  • Really never try to eject a USB device
  • Fix a issue with &> usage (replaced with 1> and 2>)
  • Adds magic file to depllist in order to have file working + ldd which helps for debugging issues
  • tty modes correct to avoid sh error messages
  • Use ext3 normally and not ext2 instead
  • USB device should be corrected after reading (take 1st part)
  • Adds a mount_USB_here function derived from mount_CDROM_here
  • usb detection place before /dev detection in device name at restore time
  • Fix when restoring from USB: media is asked in interactive mode
  • Adds USB support for mondorestore
  • mount_cdrom => mount_media
  • elilo.efi is now searched throughout /boot/efi and not in a fixed place as there is no standard
  • untar-and-softlink => untar (+ interface change)
  • suppress useless softlinks creation/removal in boot process
  • avoids udevd messages on groups
  • Increase # of disks to 99 as in mindi at restore time (should be a conf file parameter)
  • skip existing big file creation
  • seems to work correctly for USB mindi boot
  • Adds group and tty link to udev conf
  • Always load usb-torage (even 2.6) to initiate USB bus discovery
  • Better printing of messages
  • Attempt to fix a bug in supporting OpenSusE 10.3 kernel for initramfs (mindi may now use multiple regex for kernel initrd detection)
  • Links were not correctly done as non relative for modules in mindi
  • exclusion of modules denied now works
  • Also create modules in their ordinary place, so that classical modprobe works + copy modules.dep
  • Fix bugs for DENY_MODS handling
  • Add device /dev/console for udev
  • ide-generic should now really be excluded
  • Fix a bug in major number for tty
  • If udev then adds modprobe/insmod to rootfs
  • tty0 is also cretaed with udev
  • ide-generic put rather in DENY_MODS
  • udevd remove from deplist s handled in mindi directly
  • better default for mindi when using --usb
  • Handles dynamically linked busybox (in case we want to use it soon ;-)
  • Adds fixed devices to create for udev
  • ide-generic should not be part of the initrd when using libata v2
  • support a dynamically linked udev (case on Ubuntu 7.10 and Mandriva 2008.0 so should be quite generic) This will give incitation to move to dyn. linked binaries in the initrd which will help for other tasks (ia6 4)
  • Improvement in udev support (do not use cl options not available in busybox)
  • Udev in mindi
    • auto creation of the right links at boot time with udev-links.conf(from Mandriva 2008.0)
    • rework startup of udev as current makes kernel crash (from Mandriva 2008.0)
    • add support for 64 bits udev
  • Try to render MyInsmod? silent at boot time
  • Adds udev support (mandatory for newest distributions to avoid remapping of devices in a different way as on the original system)
  • We also need vaft format support for USB boot
  • Adds libusual support (Ubuntu 7.10 needs it for USB)
  • Improve Ubuntu/Debian? keyboard detection and support
  • pbinit adapted to new pb (0.8.10). Filtering of docs done in it
  • Suppress some mondo warnings and errors on USB again
  • Tries to fix lack of files in deb mindi package
  • Verify should now work for USB devices
  • More log/mesages improvement for USB support
  • - Supress g_erase_tmpdir_and_scratchdir
  • Improve some log messages for USB support
  • Try to improve install in mindi to avoid issues with isolinux.cfg not installed vene if in the pkg :-(
  • Improve mindi-busybox build
  • In conformity with pb 0.8.9
  • Add support for Ubuntu 7.10 in build process
  • Add USB Key button to Menu UI (CD streamer removed)
  • Attempt to fix error messages on tmp/scratch files at the end by removing those dir at the latest possible.
  • Fix a bug linked to the size of the -E param which could be used (Arnaud Tiger/René? Ribaud).
  • Integrate ~/.pbrc content into mondorescue.pb (required project-builder >= 0.8.7)
  • Put mondorescue in conformity with new pb filtering rules
  • Add USB support at restore time (no test done yet). New start-usb script PB varibale added where useful
  • Unmounting USB device before removal of temporary scratchdir
  • Stil refining USB copy back to mondo (one command was not executed)
  • No need to have the image subdor in the csratchdir when USB.
  • umount the USB partition before attempting to use it
  • Remove useless copy from mindi to mondo at end of USB handling

(risky merge, we are raising the limits of 2 diverging branches. The status of stable is not completely sure as such. Will need lots of tests, but it's not yet done :-()
(merge -r1692:1769 $SVN_M/branches/2.2.5)

File size: 14.8 KB
Line 
1/* vi: set sw=4 ts=4: */
2/* dhcpc.c
3 *
4 * udhcp DHCP client
5 *
6 * Russ Dill <Russ.Dill@asu.edu> July 2001
7 *
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9 */
10
11#include <getopt.h>
12#include <syslog.h>
13
14/* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
15#define WANT_PIDFILE 1
16#include "common.h"
17#include "dhcpd.h"
18#include "dhcpc.h"
19#include "options.h"
20
21
22/* Something is definitely wrong here. IPv4 addresses
23 * in variables of type long?? BTW, we use inet_ntoa()
24 * in the code. Manpage says that struct in_addr has a member of type long (!)
25 * which holds IPv4 address, and the struct is passed by value (!!)
26 */
27static unsigned timeout;
28static uint32_t requested_ip; /* = 0 */
29static uint32_t server_addr;
30static int packet_num; /* = 0 */
31static int sockfd = -1;
32
33#define LISTEN_NONE 0
34#define LISTEN_KERNEL 1
35#define LISTEN_RAW 2
36static smallint listen_mode;
37
38static smallint state;
39
40struct client_config_t client_config;
41
42
43/* just a little helper */
44static void change_mode(int new_mode)
45{
46    DEBUG("entering %s listen mode",
47        new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
48    if (sockfd >= 0) {
49        close(sockfd);
50        sockfd = -1;
51    }
52    listen_mode = new_mode;
53}
54
55
56/* perform a renew */
57static void perform_renew(void)
58{
59    bb_info_msg("Performing a DHCP renew");
60    switch (state) {
61    case BOUND:
62        change_mode(LISTEN_KERNEL);
63    case RENEWING:
64    case REBINDING:
65        state = RENEW_REQUESTED;
66        break;
67    case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
68        udhcp_run_script(NULL, "deconfig");
69    case REQUESTING:
70    case RELEASED:
71        change_mode(LISTEN_RAW);
72        state = INIT_SELECTING;
73        break;
74    case INIT_SELECTING:
75        break;
76    }
77
78    /* start things over */
79    packet_num = 0;
80
81    /* Kill any timeouts because the user wants this to hurry along */
82    timeout = 0;
83}
84
85
86/* perform a release */
87static void perform_release(void)
88{
89    char buffer[sizeof("255.255.255.255")];
90    struct in_addr temp_addr;
91
92    /* send release packet */
93    if (state == BOUND || state == RENEWING || state == REBINDING) {
94        temp_addr.s_addr = server_addr;
95        strcpy(buffer, inet_ntoa(temp_addr));
96        temp_addr.s_addr = requested_ip;
97        bb_info_msg("Unicasting a release of %s to %s",
98                inet_ntoa(temp_addr), buffer);
99        send_release(server_addr, requested_ip); /* unicast */
100        udhcp_run_script(NULL, "deconfig");
101    }
102    bb_info_msg("Entering released state");
103
104    change_mode(LISTEN_NONE);
105    state = RELEASED;
106    timeout = INT_MAX;
107}
108
109
110static void client_background(void)
111{
112#if !BB_MMU
113    bb_error_msg("cannot background in uclinux (yet)");
114/* ... mainly because udhcpc calls client_background()
115 * in _the _middle _of _udhcpc _run_, not at the start!
116 * If that will be properly disabled for NOMMU, client_background()
117 * will work on NOMMU too */
118#else
119    bb_daemonize(0);
120    logmode &= ~LOGMODE_STDIO;
121    /* rewrite pidfile, as our pid is different now */
122    write_pidfile(client_config.pidfile);
123#endif
124    /* Do not fork again. */
125    client_config.foreground = 1;
126    client_config.background_if_no_lease = 0;
127}
128
129
130static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
131{
132    uint8_t *storage;
133    int len = strlen(str);
134    if (len > 255) len = 255;
135    storage = xzalloc(len + extra + OPT_DATA);
136    storage[OPT_CODE] = code;
137    storage[OPT_LEN] = len + extra;
138    memcpy(storage + extra + OPT_DATA, str, len);
139    return storage;
140}
141
142
143int udhcpc_main(int argc, char **argv);
144int udhcpc_main(int argc, char **argv)
145{
146    uint8_t *temp, *message;
147    char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
148    uint32_t xid = 0;
149    uint32_t lease = 0; /* can be given as 32-bit quantity */
150    unsigned t1 = 0, t2 = 0; /* what a wonderful names */
151    unsigned start = 0;
152    unsigned now;
153    unsigned opt;
154    int max_fd;
155    int retval;
156    int len;
157    struct timeval tv;
158    struct in_addr temp_addr;
159    struct dhcpMessage packet;
160    fd_set rfds;
161
162    enum {
163        OPT_c = 1 << 0,
164        OPT_C = 1 << 1,
165        OPT_V = 1 << 2,
166        OPT_f = 1 << 3,
167        OPT_b = 1 << 4,
168        OPT_H = 1 << 5,
169        OPT_h = 1 << 6,
170        OPT_F = 1 << 7,
171        OPT_i = 1 << 8,
172        OPT_n = 1 << 9,
173        OPT_p = 1 << 10,
174        OPT_q = 1 << 11,
175        OPT_R = 1 << 12,
176        OPT_r = 1 << 13,
177        OPT_s = 1 << 14,
178        OPT_T = 1 << 15,
179        OPT_t = 1 << 16,
180        OPT_v = 1 << 17,
181        OPT_S = 1 << 18,
182    };
183#if ENABLE_GETOPT_LONG
184    static const char udhcpc_longopts[] ALIGN1 =
185        "clientid\0"      Required_argument "c"
186        "clientid-none\0" No_argument       "C"
187        "vendorclass\0"   Required_argument "V"
188        "foreground\0"    No_argument       "f"
189        "background\0"    No_argument       "b"
190        "hostname\0"      Required_argument "H"
191        "hostname\0"      Required_argument "h"
192        "fqdn\0"          Required_argument "F"
193        "interface\0"     Required_argument "i"
194        "now\0"           No_argument       "n"
195        "pidfile\0"       Required_argument "p"
196        "quit\0"          No_argument       "q"
197        "release\0"       No_argument       "R"
198        "request\0"       Required_argument "r"
199        "script\0"        Required_argument "s"
200        "timeout\0"       Required_argument "T"
201        "version\0"       No_argument       "v"
202        "retries\0"       Required_argument "t"
203        "syslog\0"        No_argument       "S"
204        ;
205#endif
206    /* Default options. */
207    client_config.interface = "eth0";
208    client_config.script = DEFAULT_SCRIPT;
209    client_config.retries = 3;
210    client_config.timeout = 3;
211
212    /* Parse command line */
213    opt_complementary = "c--C:C--c" // mutually exclusive
214                        ":hH:Hh"; // -h and -H are the same
215#if ENABLE_GETOPT_LONG
216    applet_long_options = udhcpc_longopts;
217#endif
218    opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vS",
219        &str_c, &str_V, &str_h, &str_h, &str_F,
220        &client_config.interface, &client_config.pidfile, &str_r,
221        &client_config.script, &str_T, &str_t
222        );
223
224    if (opt & OPT_c)
225        client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
226    //if (opt & OPT_C)
227    if (opt & OPT_V)
228        client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
229    if (opt & OPT_f)
230        client_config.foreground = 1;
231    if (opt & OPT_b)
232        client_config.background_if_no_lease = 1;
233    if (opt & OPT_h)
234        client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0);
235    if (opt & OPT_F) {
236        client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3);
237        /* Flags: 0000NEOS
238        S: 1 => Client requests Server to update A RR in DNS as well as PTR
239        O: 1 => Server indicates to client that DNS has been updated regardless
240        E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
241        N: 1 => Client requests Server to not update DNS
242        */
243        client_config.fqdn[OPT_DATA + 0] = 0x1;
244        /* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */
245        /* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */
246    }
247    // if (opt & OPT_i) client_config.interface = ...
248    if (opt & OPT_n)
249        client_config.abort_if_no_lease = 1;
250    // if (opt & OPT_p) client_config.pidfile = ...
251    if (opt & OPT_q)
252        client_config.quit_after_lease = 1;
253    if (opt & OPT_R)
254        client_config.release_on_quit = 1;
255    if (opt & OPT_r)
256        requested_ip = inet_addr(str_r);
257    // if (opt & OPT_s) client_config.script = ...
258    if (opt & OPT_T)
259        client_config.timeout = xatoi_u(str_T);
260    if (opt & OPT_t)
261        client_config.retries = xatoi_u(str_t);
262    if (opt & OPT_v) {
263        printf("version %s\n", BB_VER);
264        return 0;
265    }
266
267    if (opt & OPT_S) {
268        openlog(applet_name, LOG_PID, LOG_LOCAL0);
269        logmode |= LOGMODE_SYSLOG;
270    }
271
272    if (read_interface(client_config.interface, &client_config.ifindex,
273               NULL, client_config.arp))
274        return 1;
275
276    /* Make sure fd 0,1,2 are open */
277    bb_sanitize_stdio();
278    /* Equivalent of doing a fflush after every \n */
279    setlinebuf(stdout);
280
281    /* Create pidfile */
282    write_pidfile(client_config.pidfile);
283    /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */
284
285    /* Goes to stdout and possibly syslog */
286    bb_info_msg("%s (v%s) started", applet_name, BB_VER);
287
288    /* if not set, and not suppressed, setup the default client ID */
289    if (!client_config.clientid && !(opt & OPT_C)) {
290        client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
291        client_config.clientid[OPT_DATA] = 1;
292        memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
293    }
294
295    if (!client_config.vendorclass)
296        client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
297
298    /* setup the signal pipe */
299    udhcp_sp_setup();
300
301    state = INIT_SELECTING;
302    udhcp_run_script(NULL, "deconfig");
303    change_mode(LISTEN_RAW);
304    tv.tv_sec = 0;
305    goto jump_in;
306
307    for (;;) {
308        tv.tv_sec = timeout - monotonic_sec();
309 jump_in:
310        tv.tv_usec = 0;
311
312        if (listen_mode != LISTEN_NONE && sockfd < 0) {
313            if (listen_mode == LISTEN_KERNEL)
314                sockfd = listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
315            else
316                sockfd = raw_socket(client_config.ifindex);
317        }
318        max_fd = udhcp_sp_fd_set(&rfds, sockfd);
319
320        retval = 0; /* If we already timed out, fall through, else... */
321        if (tv.tv_sec > 0) {
322            DEBUG("Waiting on select...");
323            retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
324        }
325
326        now = monotonic_sec();
327        if (retval < 0) {
328            /* EINTR? signal was caught, don't panic */
329            if (errno != EINTR) {
330                /* Else: an error occured, panic! */
331                bb_perror_msg_and_die("select");
332            }
333        } else if (retval == 0) {
334            /* timeout dropped to zero */
335            switch (state) {
336            case INIT_SELECTING:
337                if (packet_num < client_config.retries) {
338                    if (packet_num == 0)
339                        xid = random_xid();
340
341                    /* send discover packet */
342                    send_discover(xid, requested_ip); /* broadcast */
343
344                    timeout = now + client_config.timeout;
345                    packet_num++;
346                } else {
347                    udhcp_run_script(NULL, "leasefail");
348                    if (client_config.background_if_no_lease) {
349                        bb_info_msg("No lease, forking to background");
350                        client_background();
351                    } else if (client_config.abort_if_no_lease) {
352                        bb_info_msg("No lease, failing");
353                        retval = 1;
354                        goto ret;
355                    }
356                    /* wait to try again */
357                    packet_num = 0;
358                    timeout = now + 60;
359                }
360                break;
361            case RENEW_REQUESTED:
362            case REQUESTING:
363                if (packet_num < client_config.retries) {
364                    /* send request packet */
365                    if (state == RENEW_REQUESTED)
366                        send_renew(xid, server_addr, requested_ip); /* unicast */
367                    else send_selecting(xid, server_addr, requested_ip); /* broadcast */
368
369                    timeout = now + ((packet_num == 2) ? 10 : 2);
370                    packet_num++;
371                } else {
372                    /* timed out, go back to init state */
373                    if (state == RENEW_REQUESTED)
374                        udhcp_run_script(NULL, "deconfig");
375                    state = INIT_SELECTING;
376                    timeout = now;
377                    packet_num = 0;
378                    change_mode(LISTEN_RAW);
379                }
380                break;
381            case BOUND:
382                /* Lease is starting to run out, time to enter renewing state */
383                state = RENEWING;
384                change_mode(LISTEN_KERNEL);
385                DEBUG("Entering renew state");
386                /* fall right through */
387            case RENEWING:
388                /* Either set a new T1, or enter REBINDING state */
389                if ((t2 - t1) <= (lease / 14400 + 1)) {
390                    /* timed out, enter rebinding state */
391                    state = REBINDING;
392                    timeout = now + (t2 - t1);
393                    DEBUG("Entering rebinding state");
394                } else {
395                    /* send a request packet */
396                    send_renew(xid, server_addr, requested_ip); /* unicast */
397                    t1 = (t2 - t1) / 2 + t1;
398                    timeout = start + t1;
399                }
400                break;
401            case REBINDING:
402                /* Either set a new T2, or enter INIT state */
403                if ((lease - t2) <= (lease / 14400 + 1)) {
404                    /* timed out, enter init state */
405                    state = INIT_SELECTING;
406                    bb_info_msg("Lease lost, entering init state");
407                    udhcp_run_script(NULL, "deconfig");
408                    timeout = now;
409                    packet_num = 0;
410                    change_mode(LISTEN_RAW);
411                } else {
412                    /* send a request packet */
413                    send_renew(xid, 0, requested_ip); /* broadcast */
414                    t2 = (lease - t2) / 2 + t2;
415                    timeout = start + t2;
416                }
417                break;
418            case RELEASED:
419                /* yah, I know, *you* say it would never happen */
420                timeout = INT_MAX;
421                break;
422            }
423        } else if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
424            /* a packet is ready, read it */
425
426            if (listen_mode == LISTEN_KERNEL)
427                len = udhcp_get_packet(&packet, sockfd);
428            else len = get_raw_packet(&packet, sockfd);
429
430            if (len == -1 && errno != EINTR) {
431                DEBUG("error on read, %s, reopening socket", strerror(errno));
432                change_mode(listen_mode); /* just close and reopen */
433            }
434            if (len < 0) continue;
435
436            if (packet.xid != xid) {
437                DEBUG("Ignoring XID %x (our xid is %x)",
438                    (unsigned)packet.xid, (unsigned)xid);
439                continue;
440            }
441
442            /* Ignore packets that aren't for us */
443            if (memcmp(packet.chaddr, client_config.arp, 6)) {
444                DEBUG("Packet does not have our chaddr - ignoring");
445                continue;
446            }
447
448            message = get_option(&packet, DHCP_MESSAGE_TYPE);
449            if (message == NULL) {
450                bb_error_msg("cannot get option from packet - ignoring");
451                continue;
452            }
453
454            switch (state) {
455            case INIT_SELECTING:
456                /* Must be a DHCPOFFER to one of our xid's */
457                if (*message == DHCPOFFER) {
458                    temp = get_option(&packet, DHCP_SERVER_ID);
459                    if (temp) {
460                        /* can be misaligned, thus memcpy */
461                        memcpy(&server_addr, temp, 4);
462                        xid = packet.xid;
463                        requested_ip = packet.yiaddr;
464
465                        /* enter requesting state */
466                        state = REQUESTING;
467                        timeout = now;
468                        packet_num = 0;
469                    } else {
470                        bb_error_msg("no server ID in message");
471                    }
472                }
473                break;
474            case RENEW_REQUESTED:
475            case REQUESTING:
476            case RENEWING:
477            case REBINDING:
478                if (*message == DHCPACK) {
479                    temp = get_option(&packet, DHCP_LEASE_TIME);
480                    if (!temp) {
481                        bb_error_msg("no lease time with ACK, using 1 hour lease");
482                        lease = 60 * 60;
483                    } else {
484                        /* can be misaligned, thus memcpy */
485                        memcpy(&lease, temp, 4);
486                        lease = ntohl(lease);
487                    }
488
489                    /* enter bound state */
490                    t1 = lease / 2;
491
492                    /* little fixed point for n * .875 */
493                    t2 = (lease * 7) >> 3;
494                    temp_addr.s_addr = packet.yiaddr;
495                    bb_info_msg("Lease of %s obtained, lease time %u",
496                        inet_ntoa(temp_addr), (unsigned)lease);
497                    start = now;
498                    timeout = start + t1;
499                    requested_ip = packet.yiaddr;
500                    udhcp_run_script(&packet,
501                           ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
502
503                    state = BOUND;
504                    change_mode(LISTEN_NONE);
505                    if (client_config.quit_after_lease) {
506                        if (client_config.release_on_quit)
507                            perform_release();
508                        goto ret0;
509                    }
510                    if (!client_config.foreground)
511                        client_background();
512
513                } else if (*message == DHCPNAK) {
514                    /* return to init state */
515                    bb_info_msg("Received DHCP NAK");
516                    udhcp_run_script(&packet, "nak");
517                    if (state != REQUESTING)
518                        udhcp_run_script(NULL, "deconfig");
519                    state = INIT_SELECTING;
520                    timeout = now;
521                    requested_ip = 0;
522                    packet_num = 0;
523                    change_mode(LISTEN_RAW);
524                    sleep(3); /* avoid excessive network traffic */
525                }
526                break;
527            /* case BOUND, RELEASED: - ignore all packets */
528            }
529        } else {
530            int signo = udhcp_sp_read(&rfds);
531            switch (signo) {
532            case SIGUSR1:
533                perform_renew();
534                break;
535            case SIGUSR2:
536                perform_release();
537                break;
538            case SIGTERM:
539                bb_info_msg("Received SIGTERM");
540                if (client_config.release_on_quit)
541                    perform_release();
542                goto ret0;
543            }
544        }
545    } /* for (;;) */
546 ret0:
547    retval = 0;
548 ret:
549    /*if (client_config.pidfile) - remove_pidfile has it's own check */
550        remove_pidfile(client_config.pidfile);
551    return retval;
552}
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