source: branches/stable/mindi-busybox/networking/udhcp/files.c @ 1770

Last change on this file since 1770 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: 11.3 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * files.c -- DHCP server file manipulation *
4 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
5 */
6
7#include <netinet/ether.h>
8
9#include "common.h"
10#include "dhcpd.h"
11#include "options.h"
12
13
14/* on these functions, make sure your datatype matches */
15static int read_ip(const char *line, void *arg)
16{
17    len_and_sockaddr *lsa;
18
19    lsa = host_and_af2sockaddr(line, 0, AF_INET);
20    if (!lsa)
21        return 0;
22    *(uint32_t*)arg = lsa->sin.sin_addr.s_addr;
23    free(lsa);
24    return 1;
25}
26
27static int read_mac(const char *line, void *arg)
28{
29    uint8_t *mac_bytes = arg;
30    struct ether_addr *temp_ether_addr;
31
32    temp_ether_addr = ether_aton(line);
33    if (temp_ether_addr == NULL)
34        return 0;
35    memcpy(mac_bytes, temp_ether_addr, 6);
36    return 1;
37}
38
39
40static int read_str(const char *line, void *arg)
41{
42    char **dest = arg;
43
44    free(*dest);
45    *dest = xstrdup(line);
46    return 1;
47}
48
49
50static int read_u32(const char *line, void *arg)
51{
52    *(uint32_t*)arg = bb_strtou32(line, NULL, 10);
53    return errno == 0;
54}
55
56
57static int read_yn(const char *line, void *arg)
58{
59    char *dest = arg;
60
61    if (!strcasecmp("yes", line)) {
62        *dest = 1;
63        return 1;
64    }
65    if (!strcasecmp("no", line)) {
66        *dest = 0;
67        return 1;
68    }
69    return 0;
70}
71
72
73/* find option 'code' in opt_list */
74struct option_set *find_option(struct option_set *opt_list, char code)
75{
76    while (opt_list && opt_list->data[OPT_CODE] < code)
77        opt_list = opt_list->next;
78
79    if (opt_list && opt_list->data[OPT_CODE] == code)
80        return opt_list;
81    return NULL;
82}
83
84
85/* add an option to the opt_list */
86static void attach_option(struct option_set **opt_list,
87        const struct dhcp_option *option, char *buffer, int length)
88{
89    struct option_set *existing, *new, **curr;
90
91    existing = find_option(*opt_list, option->code);
92    if (!existing) {
93        DEBUG("Attaching option %s to list", option->name);
94
95#if ENABLE_FEATURE_RFC3397
96        if ((option->flags & TYPE_MASK) == OPTION_STR1035)
97            /* reuse buffer and length for RFC1035-formatted string */
98            buffer = dname_enc(NULL, 0, buffer, &length);
99#endif
100
101        /* make a new option */
102        new = xmalloc(sizeof(*new));
103        new->data = xmalloc(length + 2);
104        new->data[OPT_CODE] = option->code;
105        new->data[OPT_LEN] = length;
106        memcpy(new->data + 2, buffer, length);
107
108        curr = opt_list;
109        while (*curr && (*curr)->data[OPT_CODE] < option->code)
110            curr = &(*curr)->next;
111
112        new->next = *curr;
113        *curr = new;
114#if ENABLE_FEATURE_RFC3397
115        if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
116            free(buffer);
117#endif
118        return;
119    }
120
121    /* add it to an existing option */
122    DEBUG("Attaching option %s to existing member of list", option->name);
123    if (option->flags & OPTION_LIST) {
124#if ENABLE_FEATURE_RFC3397
125        if ((option->flags & TYPE_MASK) == OPTION_STR1035)
126            /* reuse buffer and length for RFC1035-formatted string */
127            buffer = dname_enc(existing->data + 2,
128                    existing->data[OPT_LEN], buffer, &length);
129#endif
130        if (existing->data[OPT_LEN] + length <= 255) {
131            existing->data = xrealloc(existing->data,
132                    existing->data[OPT_LEN] + length + 3);
133            if ((option->flags & TYPE_MASK) == OPTION_STRING) {
134                /* ' ' can bring us to 256 - bad */
135                if (existing->data[OPT_LEN] + length >= 255)
136                    return;
137                /* add space separator between STRING options in a list */
138                existing->data[existing->data[OPT_LEN] + 2] = ' ';
139                existing->data[OPT_LEN]++;
140            }
141            memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
142            existing->data[OPT_LEN] += length;
143        } /* else, ignore the data, we could put this in a second option in the future */
144#if ENABLE_FEATURE_RFC3397
145        if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
146            free(buffer);
147#endif
148    } /* else, ignore the new data */
149}
150
151
152/* read a dhcp option and add it to opt_list */
153static int read_opt(const char *const_line, void *arg)
154{
155    struct option_set **opt_list = arg;
156    char *opt, *val, *endptr;
157    const struct dhcp_option *option;
158    int retval = 0, length;
159    char buffer[8];
160    char *line;
161    uint16_t *result_u16 = (uint16_t *) buffer;
162    uint32_t *result_u32 = (uint32_t *) buffer;
163
164    /* Cheat, the only const line we'll actually get is "" */
165    line = (char *) const_line;
166    opt = strtok(line, " \t=");
167    if (!opt) return 0;
168
169    option = dhcp_options;
170    while (1) {
171        if (!option->code)
172            return 0;
173        if (!strcasecmp(option->name, opt))
174            break;
175        option++;
176    }
177
178    do {
179        val = strtok(NULL, ", \t");
180        if (!val) break;
181        length = option_lengths[option->flags & TYPE_MASK];
182        retval = 0;
183        opt = buffer; /* new meaning for variable opt */
184        switch (option->flags & TYPE_MASK) {
185        case OPTION_IP:
186            retval = read_ip(val, buffer);
187            break;
188        case OPTION_IP_PAIR:
189            retval = read_ip(val, buffer);
190            val = strtok(NULL, ", \t/-");
191            if (!val)
192                retval = 0;
193            if (retval)
194                retval = read_ip(val, buffer + 4);
195            break;
196        case OPTION_STRING:
197#if ENABLE_FEATURE_RFC3397
198        case OPTION_STR1035:
199#endif
200            length = strlen(val);
201            if (length > 0) {
202                if (length > 254) length = 254;
203                opt = val;
204                retval = 1;
205            }
206            break;
207        case OPTION_BOOLEAN:
208            retval = read_yn(val, buffer);
209            break;
210        case OPTION_U8:
211            buffer[0] = strtoul(val, &endptr, 0);
212            retval = (endptr[0] == '\0');
213            break;
214        /* htonX are macros in older libc's, using temp var
215         * in code below for safety */
216        /* TODO: use bb_strtoX? */
217        case OPTION_U16: {
218            unsigned long tmp = strtoul(val, &endptr, 0);
219            *result_u16 = htons(tmp);
220            retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
221            break;
222        }
223        case OPTION_S16: {
224            long tmp = strtol(val, &endptr, 0);
225            *result_u16 = htons(tmp);
226            retval = (endptr[0] == '\0');
227            break;
228        }
229        case OPTION_U32: {
230            unsigned long tmp = strtoul(val, &endptr, 0);
231            *result_u32 = htonl(tmp);
232            retval = (endptr[0] == '\0');
233            break;
234        }
235        case OPTION_S32: {
236            long tmp = strtol(val, &endptr, 0);
237            *result_u32 = htonl(tmp);
238            retval = (endptr[0] == '\0');
239            break;
240        }
241        default:
242            break;
243        }
244        if (retval)
245            attach_option(opt_list, option, opt, length);
246    } while (retval && option->flags & OPTION_LIST);
247    return retval;
248}
249
250static int read_staticlease(const char *const_line, void *arg)
251{
252    char *line;
253    char *mac_string;
254    char *ip_string;
255    uint8_t *mac_bytes;
256    uint32_t *ip;
257
258    /* Allocate memory for addresses */
259    mac_bytes = xmalloc(sizeof(unsigned char) * 8);
260    ip = xmalloc(sizeof(uint32_t));
261
262    /* Read mac */
263    line = (char *) const_line;
264    mac_string = strtok(line, " \t");
265    read_mac(mac_string, mac_bytes);
266
267    /* Read ip */
268    ip_string = strtok(NULL, " \t");
269    read_ip(ip_string, ip);
270
271    addStaticLease(arg, mac_bytes, ip);
272
273    if (ENABLE_FEATURE_UDHCP_DEBUG) printStaticLeases(arg);
274
275    return 1;
276}
277
278
279struct config_keyword {
280    const char *keyword;
281    int (*handler)(const char *line, void *var);
282    void *var;
283    const char *def;
284};
285
286static const struct config_keyword keywords[] = {
287    /* keyword       handler   variable address               default */
288    {"start",        read_ip,  &(server_config.start_ip),     "192.168.0.20"},
289    {"end",          read_ip,  &(server_config.end_ip),       "192.168.0.254"},
290    {"interface",    read_str, &(server_config.interface),    "eth0"},
291    {"option",       read_opt, &(server_config.options),      ""},
292    {"opt",          read_opt, &(server_config.options),      ""},
293    /* Avoid "max_leases value not sane" warning by setting default
294     * to default_end_ip - default_start_ip + 1: */
295    {"max_leases",   read_u32, &(server_config.max_leases),   "235"},
296    {"remaining",    read_yn,  &(server_config.remaining),    "yes"},
297    {"auto_time",    read_u32, &(server_config.auto_time),    "7200"},
298    {"decline_time", read_u32, &(server_config.decline_time), "3600"},
299    {"conflict_time",read_u32, &(server_config.conflict_time),"3600"},
300    {"offer_time",   read_u32, &(server_config.offer_time),   "60"},
301    {"min_lease",    read_u32, &(server_config.min_lease),    "60"},
302    {"lease_file",   read_str, &(server_config.lease_file),   LEASES_FILE},
303    {"pidfile",      read_str, &(server_config.pidfile),      "/var/run/udhcpd.pid"},
304    {"notify_file",  read_str, &(server_config.notify_file),  ""},
305    {"siaddr",       read_ip,  &(server_config.siaddr),       "0.0.0.0"},
306    {"sname",        read_str, &(server_config.sname),        ""},
307    {"boot_file",    read_str, &(server_config.boot_file),    ""},
308    {"static_lease", read_staticlease, &(server_config.static_leases), ""},
309    /* ADDME: static lease */
310};
311
312
313/*
314 * Domain names may have 254 chars, and string options can be 254
315 * chars long. However, 80 bytes will be enough for most, and won't
316 * hog up memory. If you have a special application, change it
317 */
318#define READ_CONFIG_BUF_SIZE 80
319
320int read_config(const char *file)
321{
322    FILE *in;
323    char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
324    int i, lm = 0;
325
326    for (i = 0; i < ARRAY_SIZE(keywords); i++)
327        if (keywords[i].def[0])
328            keywords[i].handler(keywords[i].def, keywords[i].var);
329
330    in = fopen_or_warn(file, "r");
331    if (!in) {
332        return 0;
333    }
334
335    while (fgets(buffer, READ_CONFIG_BUF_SIZE, in)) {
336        char debug_orig[READ_CONFIG_BUF_SIZE];
337        char *p;
338
339        lm++;
340        p = strchr(buffer, '\n');
341        if (p) *p = '\0';
342        if (ENABLE_FEATURE_UDHCP_DEBUG) strcpy(debug_orig, buffer);
343        p = strchr(buffer, '#');
344        if (p) *p = '\0';
345
346        if (!(token = strtok(buffer, " \t"))) continue;
347        if (!(line = strtok(NULL, ""))) continue;
348
349        /* eat leading whitespace */
350        line = skip_whitespace(line);
351        /* eat trailing whitespace */
352        i = strlen(line) - 1;
353        while (i >= 0 && isspace(line[i]))
354            line[i--] = '\0';
355
356        for (i = 0; i < ARRAY_SIZE(keywords); i++)
357            if (!strcasecmp(token, keywords[i].keyword))
358                if (!keywords[i].handler(line, keywords[i].var)) {
359                    bb_error_msg("cannot parse line %d of %s", lm, file);
360                    if (ENABLE_FEATURE_UDHCP_DEBUG)
361                        bb_error_msg("cannot parse '%s'", debug_orig);
362                    /* reset back to the default value */
363                    keywords[i].handler(keywords[i].def, keywords[i].var);
364                }
365    }
366    fclose(in);
367
368    server_config.start_ip = ntohl(server_config.start_ip);
369    server_config.end_ip = ntohl(server_config.end_ip);
370
371    return 1;
372}
373
374
375void write_leases(void)
376{
377    int fp;
378    unsigned i;
379    time_t curr = time(0);
380    unsigned long tmp_time;
381
382    fp = open3_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC, 0666);
383    if (fp < 0) {
384        return;
385    }
386
387    for (i = 0; i < server_config.max_leases; i++) {
388        if (leases[i].yiaddr != 0) {
389
390            /* screw with the time in the struct, for easier writing */
391            tmp_time = leases[i].expires;
392
393            if (server_config.remaining) {
394                if (lease_expired(&(leases[i])))
395                    leases[i].expires = 0;
396                else leases[i].expires -= curr;
397            } /* else stick with the time we got */
398            leases[i].expires = htonl(leases[i].expires);
399            // FIXME: error check??
400            full_write(fp, &leases[i], sizeof(leases[i]));
401
402            /* then restore it when done */
403            leases[i].expires = tmp_time;
404        }
405    }
406    close(fp);
407
408    if (server_config.notify_file) {
409        char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
410        system(cmd);
411        free(cmd);
412    }
413}
414
415
416void read_leases(const char *file)
417{
418    int fp;
419    unsigned int i = 0;
420    struct dhcpOfferedAddr lease;
421
422    fp = open_or_warn(file, O_RDONLY);
423    if (fp < 0) {
424        return;
425    }
426
427    while (i < server_config.max_leases
428     && full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
429    ) {
430        /* ADDME: is it a static lease */
431        uint32_t y = ntohl(lease.yiaddr);
432        if (y >= server_config.start_ip && y <= server_config.end_ip) {
433            lease.expires = ntohl(lease.expires);
434            if (!server_config.remaining)
435                lease.expires -= time(0);
436            if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
437                bb_error_msg("too many leases while loading %s", file);
438                break;
439            }
440            i++;
441        }
442    }
443    DEBUG("Read %d leases", i);
444    close(fp);
445}
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