source: MondoRescue/branches/3.3/mindi-busybox/networking/udhcp/common.c@ 3621

Last change on this file since 3621 was 3621, checked in by Bruno Cornec, 7 years ago

New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
File size: 19.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
4 *
5 * Licensed under GPLv2, see file LICENSE in this source tree.
6 */
7#include "common.h"
8
9#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
10unsigned dhcp_verbose;
11#endif
12
13const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
14 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
15};
16
17/* Supported options are easily added here.
18 * See RFC2132 for more options.
19 * OPTION_REQ: these options are requested by udhcpc (unless -o).
20 */
21const struct dhcp_optflag dhcp_optflags[] = {
22 /* flags code */
23 { OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
24 { OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
25 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
26// { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
27// { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
28 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
29// { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
30// { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
31 { OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
32 { OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
33 { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
34 { OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
35 { OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
36 { OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
37 { OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
38 { OPTION_U16 , 0x1a }, /* DHCP_MTU */
39//TODO: why do we request DHCP_BROADCAST? Can't we assume that
40//in the unlikely case it is different from typical N.N.255.255,
41//server would let us know anyway?
42 { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
43 { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
44 { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
45 { OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
46 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
47 { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
48 { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */
49 { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
50 { OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
51//TODO: must be combined with 'sname' and 'file' handling:
52 { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
53 { OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
54//TODO: not a string, but a set of LASCII strings:
55// { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
56#if ENABLE_FEATURE_UDHCP_RFC3397
57 { OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
58 { OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
59#endif
60 { OPTION_STATIC_ROUTES | OPTION_LIST , 0x79 }, /* DHCP_STATIC_ROUTES */
61#if ENABLE_FEATURE_UDHCP_8021Q
62 { OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */
63 { OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */
64#endif
65 { OPTION_STRING , 0xd1 }, /* DHCP_PXE_CONF_FILE */
66 { OPTION_STRING , 0xd2 }, /* DHCP_PXE_PATH_PREFIX */
67 { OPTION_6RD , 0xd4 }, /* DHCP_6RD */
68 { OPTION_STATIC_ROUTES | OPTION_LIST , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
69 { OPTION_STRING , 0xfc }, /* DHCP_WPAD */
70
71 /* Options below have no match in dhcp_option_strings[],
72 * are not passed to dhcpc scripts, and cannot be specified
73 * with "option XXX YYY" syntax in dhcpd config file.
74 * These entries are only used internally by udhcp[cd]
75 * to correctly encode options into packets.
76 */
77
78 { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
79 { OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
80 { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
81//looks like these opts will work just fine even without these defs:
82// { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
83// /* not really a string: */
84// { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
85 { 0, 0 } /* zeroed terminating entry */
86};
87
88/* Used for converting options from incoming packets to env variables
89 * for udhcpc stript, and for setting options for udhcpd via
90 * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
91 */
92/* Must match dhcp_optflags[] order */
93const char dhcp_option_strings[] ALIGN1 =
94 "subnet" "\0" /* DHCP_SUBNET */
95 "timezone" "\0" /* DHCP_TIME_OFFSET */
96 "router" "\0" /* DHCP_ROUTER */
97// "timesrv" "\0" /* DHCP_TIME_SERVER */
98// "namesrv" "\0" /* DHCP_NAME_SERVER */
99 "dns" "\0" /* DHCP_DNS_SERVER */
100// "logsrv" "\0" /* DHCP_LOG_SERVER */
101// "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
102 "lprsrv" "\0" /* DHCP_LPR_SERVER */
103 "hostname" "\0" /* DHCP_HOST_NAME */
104 "bootsize" "\0" /* DHCP_BOOT_SIZE */
105 "domain" "\0" /* DHCP_DOMAIN_NAME */
106 "swapsrv" "\0" /* DHCP_SWAP_SERVER */
107 "rootpath" "\0" /* DHCP_ROOT_PATH */
108 "ipttl" "\0" /* DHCP_IP_TTL */
109 "mtu" "\0" /* DHCP_MTU */
110 "broadcast" "\0" /* DHCP_BROADCAST */
111 "routes" "\0" /* DHCP_ROUTES */
112 "nisdomain" "\0" /* DHCP_NIS_DOMAIN */
113 "nissrv" "\0" /* DHCP_NIS_SERVER */
114 "ntpsrv" "\0" /* DHCP_NTP_SERVER */
115 "wins" "\0" /* DHCP_WINS_SERVER */
116 "lease" "\0" /* DHCP_LEASE_TIME */
117 "serverid" "\0" /* DHCP_SERVER_ID */
118 "message" "\0" /* DHCP_ERR_MESSAGE */
119 "tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
120 "bootfile" "\0" /* DHCP_BOOT_FILE */
121// "userclass" "\0" /* DHCP_USER_CLASS */
122#if ENABLE_FEATURE_UDHCP_RFC3397
123 "search" "\0" /* DHCP_DOMAIN_SEARCH */
124// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
125// is not handled yet by "string->option" conversion code:
126 "sipsrv" "\0" /* DHCP_SIP_SERVERS */
127#endif
128 "staticroutes" "\0"/* DHCP_STATIC_ROUTES */
129#if ENABLE_FEATURE_UDHCP_8021Q
130 "vlanid" "\0" /* DHCP_VLAN_ID */
131 "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */
132#endif
133 "pxeconffile" "\0" /* DHCP_PXE_CONF_FILE */
134 "pxepathprefix" "\0" /* DHCP_PXE_PATH_PREFIX */
135 "ip6rd" "\0" /* DHCP_6RD */
136 "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
137 "wpad" "\0" /* DHCP_WPAD */
138 ;
139
140/* Lengths of the option types in binary form.
141 * Used by:
142 * udhcp_str2optset: to determine how many bytes to allocate.
143 * xmalloc_optname_optval: to estimate string length
144 * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
145 * is the number of elements, multiply it by one element's string width
146 * (len_of_option_as_string[opt_type]) and you know how wide string you need.
147 */
148const uint8_t dhcp_option_lengths[] ALIGN1 = {
149 [OPTION_IP] = 4,
150 [OPTION_IP_PAIR] = 8,
151// [OPTION_BOOLEAN] = 1,
152 [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
153 [OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */
154#if ENABLE_FEATURE_UDHCP_RFC3397
155 [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
156 [OPTION_SIP_SERVERS] = 1,
157#endif
158 [OPTION_U8] = 1,
159 [OPTION_U16] = 2,
160// [OPTION_S16] = 2,
161 [OPTION_U32] = 4,
162 [OPTION_S32] = 4,
163 /* Just like OPTION_STRING, we use minimum length here */
164 [OPTION_STATIC_ROUTES] = 5,
165 [OPTION_6RD] = 12, /* ignored by udhcp_str2optset */
166 /* The above value was chosen as follows:
167 * len_of_option_as_string[] for this option is >60: it's a string of the form
168 * "32 128 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 255.255.255.255 ".
169 * Each additional ipv4 address takes 4 bytes in binary option and appends
170 * another "255.255.255.255 " 16-byte string. We can set [OPTION_6RD] = 4
171 * but this severely overestimates string length: instead of 16 bytes,
172 * it adds >60 for every 4 bytes in binary option.
173 * We cheat and declare here that option is in units of 12 bytes.
174 * This adds more than 60 bytes for every three ipv4 addresses - more than enough.
175 * (Even 16 instead of 12 should work, but let's be paranoid).
176 */
177};
178
179
180#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
181static void log_option(const char *pfx, const uint8_t *opt)
182{
183 if (dhcp_verbose >= 2) {
184 char buf[256 * 2 + 2];
185 *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
186 bb_error_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
187 }
188}
189#else
190# define log_option(pfx, opt) ((void)0)
191#endif
192
193unsigned FAST_FUNC udhcp_option_idx(const char *name)
194{
195 int n = index_in_strings(dhcp_option_strings, name);
196 if (n >= 0)
197 return n;
198
199 {
200 char buf[sizeof(dhcp_option_strings)];
201 char *d = buf;
202 const char *s = dhcp_option_strings;
203 while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
204 *d++ = (*s == '\0' ? ' ' : *s);
205 s++;
206 }
207 *d = '\0';
208 bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
209 }
210}
211
212/* Get an option with bounds checking (warning, result is not aligned) */
213uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
214{
215 uint8_t *optionptr;
216 int len;
217 int rem;
218 int overload = 0;
219 enum {
220 FILE_FIELD101 = FILE_FIELD * 0x101,
221 SNAME_FIELD101 = SNAME_FIELD * 0x101,
222 };
223
224 /* option bytes: [code][len][data1][data2]..[dataLEN] */
225 optionptr = packet->options;
226 rem = sizeof(packet->options);
227 while (1) {
228 if (rem <= 0) {
229 bb_error_msg("bad packet, malformed option field");
230 return NULL;
231 }
232 if (optionptr[OPT_CODE] == DHCP_PADDING) {
233 rem--;
234 optionptr++;
235 continue;
236 }
237 if (optionptr[OPT_CODE] == DHCP_END) {
238 if ((overload & FILE_FIELD101) == FILE_FIELD) {
239 /* can use packet->file, and didn't look at it yet */
240 overload |= FILE_FIELD101; /* "we looked at it" */
241 optionptr = packet->file;
242 rem = sizeof(packet->file);
243 continue;
244 }
245 if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
246 /* can use packet->sname, and didn't look at it yet */
247 overload |= SNAME_FIELD101; /* "we looked at it" */
248 optionptr = packet->sname;
249 rem = sizeof(packet->sname);
250 continue;
251 }
252 break;
253 }
254 len = 2 + optionptr[OPT_LEN];
255 rem -= len;
256 if (rem < 0)
257 continue; /* complain and return NULL */
258
259 if (optionptr[OPT_CODE] == code) {
260 log_option("option found", optionptr);
261 return optionptr + OPT_DATA;
262 }
263
264 if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
265 overload |= optionptr[OPT_DATA];
266 /* fall through */
267 }
268 optionptr += len;
269 }
270
271 /* log3 because udhcpc uses it a lot - very noisy */
272 log3("option 0x%02x not found", code);
273 return NULL;
274}
275
276/* Return the position of the 'end' option (no bounds checking) */
277int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
278{
279 int i = 0;
280
281 while (optionptr[i] != DHCP_END) {
282 if (optionptr[i] != DHCP_PADDING)
283 i += optionptr[i + OPT_LEN] + OPT_DATA-1;
284 i++;
285 }
286 return i;
287}
288
289/* Add an option (supplied in binary form) to the options.
290 * Option format: [code][len][data1][data2]..[dataLEN]
291 */
292void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
293{
294 unsigned len;
295 uint8_t *optionptr = packet->options;
296 unsigned end = udhcp_end_option(optionptr);
297
298 len = OPT_DATA + addopt[OPT_LEN];
299 /* end position + (option code/length + addopt length) + end option */
300 if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
301//TODO: learn how to use overflow option if we exhaust packet->options[]
302 bb_error_msg("option 0x%02x did not fit into the packet",
303 addopt[OPT_CODE]);
304 return;
305 }
306 log_option("adding option", addopt);
307 memcpy(optionptr + end, addopt, len);
308 optionptr[end + len] = DHCP_END;
309}
310
311/* Add an one to four byte option to a packet */
312void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
313{
314 const struct dhcp_optflag *dh;
315
316 for (dh = dhcp_optflags; dh->code; dh++) {
317 if (dh->code == code) {
318 uint8_t option[6], len;
319
320 option[OPT_CODE] = code;
321 len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
322 option[OPT_LEN] = len;
323 if (BB_BIG_ENDIAN)
324 data <<= 8 * (4 - len);
325 /* Assignment is unaligned! */
326 move_to_unaligned32(&option[OPT_DATA], data);
327 udhcp_add_binary_option(packet, option);
328 return;
329 }
330 }
331
332 bb_error_msg("can't add option 0x%02x", code);
333}
334
335/* Find option 'code' in opt_list */
336struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
337{
338 while (opt_list && opt_list->data[OPT_CODE] < code)
339 opt_list = opt_list->next;
340
341 if (opt_list && opt_list->data[OPT_CODE] == code)
342 return opt_list;
343 return NULL;
344}
345
346/* Parse string to IP in network order */
347int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
348{
349 len_and_sockaddr *lsa;
350
351 lsa = host_and_af2sockaddr(str, 0, AF_INET);
352 if (!lsa)
353 return 0;
354 /* arg maybe unaligned */
355 move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
356 free(lsa);
357 return 1;
358}
359
360/* udhcp_str2optset:
361 * Parse string option representation to binary form and add it to opt_list.
362 * Called to parse "udhcpc -x OPTNAME:OPTVAL"
363 * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
364 */
365/* helper for the helper */
366static char *allocate_tempopt_if_needed(
367 const struct dhcp_optflag *optflag,
368 char *buffer,
369 int *length_p)
370{
371 char *allocated = NULL;
372 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
373 const char *end;
374 allocated = xstrdup(buffer); /* more than enough */
375 end = hex2bin(allocated, buffer, 255);
376 if (errno)
377 bb_error_msg_and_die("malformed hex string '%s'", buffer);
378 *length_p = end - allocated;
379 }
380 return allocated;
381}
382/* helper: add an option to the opt_list */
383static NOINLINE void attach_option(
384 struct option_set **opt_list,
385 const struct dhcp_optflag *optflag,
386 char *buffer,
387 int length)
388{
389 struct option_set *existing;
390 char *allocated;
391
392 allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
393#if ENABLE_FEATURE_UDHCP_RFC3397
394 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
395 /* reuse buffer and length for RFC1035-formatted string */
396 allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
397 }
398#endif
399
400 existing = udhcp_find_option(*opt_list, optflag->code);
401 if (!existing) {
402 struct option_set *new, **curr;
403
404 /* make a new option */
405 log2("attaching option %02x to list", optflag->code);
406 new = xmalloc(sizeof(*new));
407 new->data = xmalloc(length + OPT_DATA);
408 new->data[OPT_CODE] = optflag->code;
409 new->data[OPT_LEN] = length;
410 memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
411
412 curr = opt_list;
413 while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
414 curr = &(*curr)->next;
415
416 new->next = *curr;
417 *curr = new;
418 goto ret;
419 }
420
421 if (optflag->flags & OPTION_LIST) {
422 unsigned old_len;
423
424 /* add it to an existing option */
425 log2("attaching option %02x to existing member of list", optflag->code);
426 old_len = existing->data[OPT_LEN];
427 if (old_len + length < 255) {
428 /* actually 255 is ok too, but adding a space can overlow it */
429
430 existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
431 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
432 || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
433 ) {
434 /* add space separator between STRING options in a list */
435 existing->data[OPT_DATA + old_len] = ' ';
436 old_len++;
437 }
438 memcpy(existing->data + OPT_DATA + old_len, (allocated ? allocated : buffer), length);
439 existing->data[OPT_LEN] = old_len + length;
440 } /* else, ignore the data, we could put this in a second option in the future */
441 } /* else, ignore the new data */
442
443 ret:
444 free(allocated);
445}
446
447int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
448{
449 struct option_set **opt_list = arg;
450 char *opt, *val;
451 char *str;
452 const struct dhcp_optflag *optflag;
453 struct dhcp_optflag bin_optflag;
454 unsigned optcode;
455 int retval, length;
456 /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
457 char buffer[9] ALIGNED(4);
458 uint16_t *result_u16 = (uint16_t *) buffer;
459 uint32_t *result_u32 = (uint32_t *) buffer;
460
461 /* Cheat, the only *const* str possible is "" */
462 str = (char *) const_str;
463 opt = strtok(str, " \t=");
464 if (!opt)
465 return 0;
466
467 optcode = bb_strtou(opt, NULL, 0);
468 if (!errno && optcode < 255) {
469 /* Raw (numeric) option code */
470 bin_optflag.flags = OPTION_BIN;
471 bin_optflag.code = optcode;
472 optflag = &bin_optflag;
473 } else {
474 optflag = &dhcp_optflags[udhcp_option_idx(opt)];
475 }
476
477 retval = 0;
478 do {
479 val = strtok(NULL, ", \t");
480 if (!val)
481 break;
482 length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
483 retval = 0;
484 opt = buffer; /* new meaning for variable opt */
485 switch (optflag->flags & OPTION_TYPE_MASK) {
486 case OPTION_IP:
487 retval = udhcp_str2nip(val, buffer);
488 break;
489 case OPTION_IP_PAIR:
490 retval = udhcp_str2nip(val, buffer);
491 val = strtok(NULL, ", \t/-");
492 if (!val)
493 retval = 0;
494 if (retval)
495 retval = udhcp_str2nip(val, buffer + 4);
496 break;
497 case OPTION_STRING:
498 case OPTION_STRING_HOST:
499#if ENABLE_FEATURE_UDHCP_RFC3397
500 case OPTION_DNS_STRING:
501#endif
502 length = strnlen(val, 254);
503 if (length > 0) {
504 opt = val;
505 retval = 1;
506 }
507 break;
508// case OPTION_BOOLEAN: {
509// static const char no_yes[] ALIGN1 = "no\0yes\0";
510// buffer[0] = retval = index_in_strings(no_yes, val);
511// retval++; /* 0 - bad; 1: "no" 2: "yes" */
512// break;
513// }
514 case OPTION_U8:
515 buffer[0] = bb_strtou32(val, NULL, 0);
516 retval = (errno == 0);
517 break;
518 /* htonX are macros in older libc's, using temp var
519 * in code below for safety */
520 /* TODO: use bb_strtoX? */
521 case OPTION_U16: {
522 uint32_t tmp = bb_strtou32(val, NULL, 0);
523 *result_u16 = htons(tmp);
524 retval = (errno == 0 /*&& tmp < 0x10000*/);
525 break;
526 }
527// case OPTION_S16: {
528// long tmp = bb_strtoi32(val, NULL, 0);
529// *result_u16 = htons(tmp);
530// retval = (errno == 0);
531// break;
532// }
533 case OPTION_U32: {
534 uint32_t tmp = bb_strtou32(val, NULL, 0);
535 *result_u32 = htonl(tmp);
536 retval = (errno == 0);
537 break;
538 }
539 case OPTION_S32: {
540 int32_t tmp = bb_strtoi32(val, NULL, 0);
541 *result_u32 = htonl(tmp);
542 retval = (errno == 0);
543 break;
544 }
545 case OPTION_STATIC_ROUTES: {
546 /* Input: "a.b.c.d/m" */
547 /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
548 unsigned mask;
549 char *slash = strchr(val, '/');
550 if (slash) {
551 *slash = '\0';
552 retval = udhcp_str2nip(val, buffer + 1);
553 buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
554 val = strtok(NULL, ", \t/-");
555 if (!val || mask > 32 || errno)
556 retval = 0;
557 if (retval) {
558 length = ((mask + 7) >> 3) + 5;
559 retval = udhcp_str2nip(val, buffer + (length - 4));
560 }
561 }
562 break;
563 }
564 case OPTION_BIN: /* handled in attach_option() */
565 opt = val;
566 retval = 1;
567 default:
568 break;
569 }
570 if (retval)
571 attach_option(opt_list, optflag, opt, length);
572 } while (retval && (optflag->flags & OPTION_LIST));
573
574 return retval;
575}
576
577/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
578int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
579{
580 char hexstrbuf[16 * 2];
581 bin2hex(hexstrbuf, (void*)ip, 16);
582 return sprintf(dest, /* "%s" */
583 "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
584 /* pre, */
585 hexstrbuf + 0 * 4,
586 hexstrbuf + 1 * 4,
587 hexstrbuf + 2 * 4,
588 hexstrbuf + 3 * 4,
589 hexstrbuf + 4 * 4,
590 hexstrbuf + 5 * 4,
591 hexstrbuf + 6 * 4,
592 hexstrbuf + 7 * 4
593 );
594}
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