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
|
---|
10 | unsigned dhcp_verbose;
|
---|
11 | #endif
|
---|
12 |
|
---|
13 | const 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 | */
|
---|
21 | const 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 | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
|
---|
33 | { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
|
---|
34 | { OPTION_STRING | 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 | { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
|
---|
40 | { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
|
---|
41 | { OPTION_STRING , 0x28 }, /* DHCP_NIS_DOMAIN */
|
---|
42 | { OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
|
---|
43 | { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
|
---|
44 | { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
|
---|
45 | { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */
|
---|
46 | { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
|
---|
47 | { OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
|
---|
48 | //TODO: must be combined with 'sname' and 'file' handling:
|
---|
49 | { OPTION_STRING , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
|
---|
50 | { OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
|
---|
51 | //TODO: not a string, but a set of LASCII strings:
|
---|
52 | // { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
|
---|
53 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
54 | { OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
|
---|
55 | { OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
|
---|
56 | #endif
|
---|
57 | { OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
|
---|
58 | { OPTION_STATIC_ROUTES , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
|
---|
59 | { OPTION_STRING , 0xfc }, /* DHCP_WPAD */
|
---|
60 |
|
---|
61 | /* Options below have no match in dhcp_option_strings[],
|
---|
62 | * are not passed to dhcpc scripts, and cannot be specified
|
---|
63 | * with "option XXX YYY" syntax in dhcpd config file.
|
---|
64 | * These entries are only used internally by udhcp[cd]
|
---|
65 | * to correctly encode options into packets.
|
---|
66 | */
|
---|
67 |
|
---|
68 | { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
|
---|
69 | { OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
|
---|
70 | { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
|
---|
71 | //looks like these opts will work just fine even without these defs:
|
---|
72 | // { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
|
---|
73 | // /* not really a string: */
|
---|
74 | // { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
|
---|
75 | { 0, 0 } /* zeroed terminating entry */
|
---|
76 | };
|
---|
77 |
|
---|
78 | /* Used for converting options from incoming packets to env variables
|
---|
79 | * for udhcpc stript, and for setting options for udhcpd via
|
---|
80 | * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
|
---|
81 | */
|
---|
82 | /* Must match dhcp_optflags[] order */
|
---|
83 | const char dhcp_option_strings[] ALIGN1 =
|
---|
84 | "subnet" "\0" /* DHCP_SUBNET */
|
---|
85 | "timezone" "\0" /* DHCP_TIME_OFFSET */
|
---|
86 | "router" "\0" /* DHCP_ROUTER */
|
---|
87 | // "timesrv" "\0" /* DHCP_TIME_SERVER */
|
---|
88 | // "namesrv" "\0" /* DHCP_NAME_SERVER */
|
---|
89 | "dns" "\0" /* DHCP_DNS_SERVER */
|
---|
90 | // "logsrv" "\0" /* DHCP_LOG_SERVER */
|
---|
91 | // "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
|
---|
92 | "lprsrv" "\0" /* DHCP_LPR_SERVER */
|
---|
93 | "hostname" "\0" /* DHCP_HOST_NAME */
|
---|
94 | "bootsize" "\0" /* DHCP_BOOT_SIZE */
|
---|
95 | "domain" "\0" /* DHCP_DOMAIN_NAME */
|
---|
96 | "swapsrv" "\0" /* DHCP_SWAP_SERVER */
|
---|
97 | "rootpath" "\0" /* DHCP_ROOT_PATH */
|
---|
98 | "ipttl" "\0" /* DHCP_IP_TTL */
|
---|
99 | "mtu" "\0" /* DHCP_MTU */
|
---|
100 | "broadcast" "\0" /* DHCP_BROADCAST */
|
---|
101 | "routes" "\0" /* DHCP_ROUTES */
|
---|
102 | "nisdomain" "\0" /* DHCP_NIS_DOMAIN */
|
---|
103 | "nissrv" "\0" /* DHCP_NIS_SERVER */
|
---|
104 | "ntpsrv" "\0" /* DHCP_NTP_SERVER */
|
---|
105 | "wins" "\0" /* DHCP_WINS_SERVER */
|
---|
106 | "lease" "\0" /* DHCP_LEASE_TIME */
|
---|
107 | "serverid" "\0" /* DHCP_SERVER_ID */
|
---|
108 | "message" "\0" /* DHCP_ERR_MESSAGE */
|
---|
109 | "tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
|
---|
110 | "bootfile" "\0" /* DHCP_BOOT_FILE */
|
---|
111 | // "userclass" "\0" /* DHCP_USER_CLASS */
|
---|
112 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
113 | "search" "\0" /* DHCP_DOMAIN_SEARCH */
|
---|
114 | // doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
|
---|
115 | // is not handled yet by "string->option" conversion code:
|
---|
116 | "sipsrv" "\0" /* DHCP_SIP_SERVERS */
|
---|
117 | #endif
|
---|
118 | // doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
|
---|
119 | // is not handled yet by "string->option" conversion code:
|
---|
120 | "staticroutes" "\0"/* DHCP_STATIC_ROUTES */
|
---|
121 | "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
|
---|
122 | "wpad" "\0" /* DHCP_WPAD */
|
---|
123 | ;
|
---|
124 |
|
---|
125 | /* Lengths of the option types in binary form.
|
---|
126 | * Used by:
|
---|
127 | * udhcp_str2optset: to determine how many bytes to allocate.
|
---|
128 | * xmalloc_optname_optval: to estimate string length
|
---|
129 | * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
|
---|
130 | * is the number of elements, multiply in by one element's string width
|
---|
131 | * (len_of_option_as_string[opt_type]) and you know how wide string you need.
|
---|
132 | */
|
---|
133 | const uint8_t dhcp_option_lengths[] ALIGN1 = {
|
---|
134 | [OPTION_IP] = 4,
|
---|
135 | [OPTION_IP_PAIR] = 8,
|
---|
136 | // [OPTION_BOOLEAN] = 1,
|
---|
137 | [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
|
---|
138 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
139 | [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
|
---|
140 | [OPTION_SIP_SERVERS] = 1,
|
---|
141 | #endif
|
---|
142 | [OPTION_U8] = 1,
|
---|
143 | [OPTION_U16] = 2,
|
---|
144 | // [OPTION_S16] = 2,
|
---|
145 | [OPTION_U32] = 4,
|
---|
146 | [OPTION_S32] = 4,
|
---|
147 | /* Just like OPTION_STRING, we use minimum length here */
|
---|
148 | [OPTION_STATIC_ROUTES] = 5,
|
---|
149 | };
|
---|
150 |
|
---|
151 |
|
---|
152 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
|
---|
153 | static void log_option(const char *pfx, const uint8_t *opt)
|
---|
154 | {
|
---|
155 | if (dhcp_verbose >= 2) {
|
---|
156 | char buf[256 * 2 + 2];
|
---|
157 | *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
|
---|
158 | bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
|
---|
159 | }
|
---|
160 | }
|
---|
161 | #else
|
---|
162 | # define log_option(pfx, opt) ((void)0)
|
---|
163 | #endif
|
---|
164 |
|
---|
165 | unsigned FAST_FUNC udhcp_option_idx(const char *name)
|
---|
166 | {
|
---|
167 | int n = index_in_strings(dhcp_option_strings, name);
|
---|
168 | if (n >= 0)
|
---|
169 | return n;
|
---|
170 |
|
---|
171 | {
|
---|
172 | char buf[sizeof(dhcp_option_strings)];
|
---|
173 | char *d = buf;
|
---|
174 | const char *s = dhcp_option_strings;
|
---|
175 | while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
|
---|
176 | *d++ = (*s == '\0' ? ' ' : *s);
|
---|
177 | s++;
|
---|
178 | }
|
---|
179 | *d = '\0';
|
---|
180 | bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
|
---|
181 | }
|
---|
182 | }
|
---|
183 |
|
---|
184 | /* Get an option with bounds checking (warning, result is not aligned) */
|
---|
185 | uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
|
---|
186 | {
|
---|
187 | uint8_t *optionptr;
|
---|
188 | int len;
|
---|
189 | int rem;
|
---|
190 | int overload = 0;
|
---|
191 | enum {
|
---|
192 | FILE_FIELD101 = FILE_FIELD * 0x101,
|
---|
193 | SNAME_FIELD101 = SNAME_FIELD * 0x101,
|
---|
194 | };
|
---|
195 |
|
---|
196 | /* option bytes: [code][len][data1][data2]..[dataLEN] */
|
---|
197 | optionptr = packet->options;
|
---|
198 | rem = sizeof(packet->options);
|
---|
199 | while (1) {
|
---|
200 | if (rem <= 0) {
|
---|
201 | bb_error_msg("bad packet, malformed option field");
|
---|
202 | return NULL;
|
---|
203 | }
|
---|
204 | if (optionptr[OPT_CODE] == DHCP_PADDING) {
|
---|
205 | rem--;
|
---|
206 | optionptr++;
|
---|
207 | continue;
|
---|
208 | }
|
---|
209 | if (optionptr[OPT_CODE] == DHCP_END) {
|
---|
210 | if ((overload & FILE_FIELD101) == FILE_FIELD) {
|
---|
211 | /* can use packet->file, and didn't look at it yet */
|
---|
212 | overload |= FILE_FIELD101; /* "we looked at it" */
|
---|
213 | optionptr = packet->file;
|
---|
214 | rem = sizeof(packet->file);
|
---|
215 | continue;
|
---|
216 | }
|
---|
217 | if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
|
---|
218 | /* can use packet->sname, and didn't look at it yet */
|
---|
219 | overload |= SNAME_FIELD101; /* "we looked at it" */
|
---|
220 | optionptr = packet->sname;
|
---|
221 | rem = sizeof(packet->sname);
|
---|
222 | continue;
|
---|
223 | }
|
---|
224 | break;
|
---|
225 | }
|
---|
226 | len = 2 + optionptr[OPT_LEN];
|
---|
227 | rem -= len;
|
---|
228 | if (rem < 0)
|
---|
229 | continue; /* complain and return NULL */
|
---|
230 |
|
---|
231 | if (optionptr[OPT_CODE] == code) {
|
---|
232 | log_option("Option found", optionptr);
|
---|
233 | return optionptr + OPT_DATA;
|
---|
234 | }
|
---|
235 |
|
---|
236 | if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
|
---|
237 | overload |= optionptr[OPT_DATA];
|
---|
238 | /* fall through */
|
---|
239 | }
|
---|
240 | optionptr += len;
|
---|
241 | }
|
---|
242 |
|
---|
243 | /* log3 because udhcpc uses it a lot - very noisy */
|
---|
244 | log3("Option 0x%02x not found", code);
|
---|
245 | return NULL;
|
---|
246 | }
|
---|
247 |
|
---|
248 | /* Return the position of the 'end' option (no bounds checking) */
|
---|
249 | int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
|
---|
250 | {
|
---|
251 | int i = 0;
|
---|
252 |
|
---|
253 | while (optionptr[i] != DHCP_END) {
|
---|
254 | if (optionptr[i] != DHCP_PADDING)
|
---|
255 | i += optionptr[i + OPT_LEN] + OPT_DATA-1;
|
---|
256 | i++;
|
---|
257 | }
|
---|
258 | return i;
|
---|
259 | }
|
---|
260 |
|
---|
261 | /* Add an option (supplied in binary form) to the options.
|
---|
262 | * Option format: [code][len][data1][data2]..[dataLEN]
|
---|
263 | */
|
---|
264 | void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
|
---|
265 | {
|
---|
266 | unsigned len;
|
---|
267 | uint8_t *optionptr = packet->options;
|
---|
268 | unsigned end = udhcp_end_option(optionptr);
|
---|
269 |
|
---|
270 | len = OPT_DATA + addopt[OPT_LEN];
|
---|
271 | /* end position + (option code/length + addopt length) + end option */
|
---|
272 | if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
|
---|
273 | //TODO: learn how to use overflow option if we exhaust packet->options[]
|
---|
274 | bb_error_msg("option 0x%02x did not fit into the packet",
|
---|
275 | addopt[OPT_CODE]);
|
---|
276 | return;
|
---|
277 | }
|
---|
278 | log_option("Adding option", addopt);
|
---|
279 | memcpy(optionptr + end, addopt, len);
|
---|
280 | optionptr[end + len] = DHCP_END;
|
---|
281 | }
|
---|
282 |
|
---|
283 | /* Add an one to four byte option to a packet */
|
---|
284 | void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
|
---|
285 | {
|
---|
286 | const struct dhcp_optflag *dh;
|
---|
287 |
|
---|
288 | for (dh = dhcp_optflags; dh->code; dh++) {
|
---|
289 | if (dh->code == code) {
|
---|
290 | uint8_t option[6], len;
|
---|
291 |
|
---|
292 | option[OPT_CODE] = code;
|
---|
293 | len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
|
---|
294 | option[OPT_LEN] = len;
|
---|
295 | if (BB_BIG_ENDIAN)
|
---|
296 | data <<= 8 * (4 - len);
|
---|
297 | /* Assignment is unaligned! */
|
---|
298 | move_to_unaligned32(&option[OPT_DATA], data);
|
---|
299 | udhcp_add_binary_option(packet, option);
|
---|
300 | return;
|
---|
301 | }
|
---|
302 | }
|
---|
303 |
|
---|
304 | bb_error_msg("can't add option 0x%02x", code);
|
---|
305 | }
|
---|
306 |
|
---|
307 | /* Find option 'code' in opt_list */
|
---|
308 | struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
|
---|
309 | {
|
---|
310 | while (opt_list && opt_list->data[OPT_CODE] < code)
|
---|
311 | opt_list = opt_list->next;
|
---|
312 |
|
---|
313 | if (opt_list && opt_list->data[OPT_CODE] == code)
|
---|
314 | return opt_list;
|
---|
315 | return NULL;
|
---|
316 | }
|
---|
317 |
|
---|
318 | /* Parse string to IP in network order */
|
---|
319 | int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
|
---|
320 | {
|
---|
321 | len_and_sockaddr *lsa;
|
---|
322 |
|
---|
323 | lsa = host_and_af2sockaddr(str, 0, AF_INET);
|
---|
324 | if (!lsa)
|
---|
325 | return 0;
|
---|
326 | *(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
|
---|
327 | free(lsa);
|
---|
328 | return 1;
|
---|
329 | }
|
---|
330 |
|
---|
331 | /* udhcp_str2optset:
|
---|
332 | * Parse string option representation to binary form and add it to opt_list.
|
---|
333 | * Called to parse "udhcpc -x OPTNAME:OPTVAL"
|
---|
334 | * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
|
---|
335 | */
|
---|
336 | /* helper for the helper */
|
---|
337 | static char *allocate_tempopt_if_needed(
|
---|
338 | const struct dhcp_optflag *optflag,
|
---|
339 | char *buffer,
|
---|
340 | int *length_p)
|
---|
341 | {
|
---|
342 | char *allocated = NULL;
|
---|
343 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
|
---|
344 | const char *end;
|
---|
345 | allocated = xstrdup(buffer); /* more than enough */
|
---|
346 | end = hex2bin(allocated, buffer, 255);
|
---|
347 | if (errno)
|
---|
348 | bb_error_msg_and_die("malformed hex string '%s'", buffer);
|
---|
349 | *length_p = end - allocated;
|
---|
350 | }
|
---|
351 | return allocated;
|
---|
352 | }
|
---|
353 | /* helper: add an option to the opt_list */
|
---|
354 | static NOINLINE void attach_option(
|
---|
355 | struct option_set **opt_list,
|
---|
356 | const struct dhcp_optflag *optflag,
|
---|
357 | char *buffer,
|
---|
358 | int length)
|
---|
359 | {
|
---|
360 | struct option_set *existing, *new, **curr;
|
---|
361 | char *allocated = NULL;
|
---|
362 |
|
---|
363 | existing = udhcp_find_option(*opt_list, optflag->code);
|
---|
364 | if (!existing) {
|
---|
365 | log2("Attaching option %02x to list", optflag->code);
|
---|
366 | allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
|
---|
367 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
368 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
|
---|
369 | /* reuse buffer and length for RFC1035-formatted string */
|
---|
370 | allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
|
---|
371 | }
|
---|
372 | #endif
|
---|
373 | /* make a new option */
|
---|
374 | new = xmalloc(sizeof(*new));
|
---|
375 | new->data = xmalloc(length + OPT_DATA);
|
---|
376 | new->data[OPT_CODE] = optflag->code;
|
---|
377 | new->data[OPT_LEN] = length;
|
---|
378 | memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
|
---|
379 |
|
---|
380 | curr = opt_list;
|
---|
381 | while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
|
---|
382 | curr = &(*curr)->next;
|
---|
383 |
|
---|
384 | new->next = *curr;
|
---|
385 | *curr = new;
|
---|
386 | goto ret;
|
---|
387 | }
|
---|
388 |
|
---|
389 | if (optflag->flags & OPTION_LIST) {
|
---|
390 | unsigned old_len;
|
---|
391 |
|
---|
392 | /* add it to an existing option */
|
---|
393 | log2("Attaching option %02x to existing member of list", optflag->code);
|
---|
394 | allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
|
---|
395 | old_len = existing->data[OPT_LEN];
|
---|
396 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
397 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
|
---|
398 | /* reuse buffer and length for RFC1035-formatted string */
|
---|
399 | allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
|
---|
400 | }
|
---|
401 | #endif
|
---|
402 | if (old_len + length < 255) {
|
---|
403 | /* actually 255 is ok too, but adding a space can overlow it */
|
---|
404 |
|
---|
405 | existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
|
---|
406 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING) {
|
---|
407 | /* add space separator between STRING options in a list */
|
---|
408 | existing->data[OPT_DATA + old_len] = ' ';
|
---|
409 | old_len++;
|
---|
410 | }
|
---|
411 | memcpy(existing->data + OPT_DATA + old_len, buffer, length);
|
---|
412 | existing->data[OPT_LEN] = old_len + length;
|
---|
413 | } /* else, ignore the data, we could put this in a second option in the future */
|
---|
414 | } /* else, ignore the new data */
|
---|
415 |
|
---|
416 | ret:
|
---|
417 | free(allocated);
|
---|
418 | }
|
---|
419 |
|
---|
420 | int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
---|
421 | {
|
---|
422 | struct option_set **opt_list = arg;
|
---|
423 | char *opt, *val, *endptr;
|
---|
424 | char *str;
|
---|
425 | const struct dhcp_optflag *optflag;
|
---|
426 | struct dhcp_optflag bin_optflag;
|
---|
427 | unsigned optcode;
|
---|
428 | int retval, length;
|
---|
429 | char buffer[8] ALIGNED(4);
|
---|
430 | uint16_t *result_u16 = (uint16_t *) buffer;
|
---|
431 | uint32_t *result_u32 = (uint32_t *) buffer;
|
---|
432 |
|
---|
433 | /* Cheat, the only *const* str possible is "" */
|
---|
434 | str = (char *) const_str;
|
---|
435 | opt = strtok(str, " \t=");
|
---|
436 | if (!opt)
|
---|
437 | return 0;
|
---|
438 |
|
---|
439 | optcode = bb_strtou(opt, NULL, 0);
|
---|
440 | if (!errno && optcode < 255) {
|
---|
441 | /* Raw (numeric) option code */
|
---|
442 | bin_optflag.flags = OPTION_BIN;
|
---|
443 | bin_optflag.code = optcode;
|
---|
444 | optflag = &bin_optflag;
|
---|
445 | } else {
|
---|
446 | optflag = &dhcp_optflags[udhcp_option_idx(opt)];
|
---|
447 | }
|
---|
448 |
|
---|
449 | retval = 0;
|
---|
450 | do {
|
---|
451 | val = strtok(NULL, ", \t");
|
---|
452 | if (!val)
|
---|
453 | break;
|
---|
454 | length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
|
---|
455 | retval = 0;
|
---|
456 | opt = buffer; /* new meaning for variable opt */
|
---|
457 | switch (optflag->flags & OPTION_TYPE_MASK) {
|
---|
458 | case OPTION_IP:
|
---|
459 | retval = udhcp_str2nip(val, buffer);
|
---|
460 | break;
|
---|
461 | case OPTION_IP_PAIR:
|
---|
462 | retval = udhcp_str2nip(val, buffer);
|
---|
463 | val = strtok(NULL, ", \t/-");
|
---|
464 | if (!val)
|
---|
465 | retval = 0;
|
---|
466 | if (retval)
|
---|
467 | retval = udhcp_str2nip(val, buffer + 4);
|
---|
468 | break;
|
---|
469 | case OPTION_STRING:
|
---|
470 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
471 | case OPTION_DNS_STRING:
|
---|
472 | #endif
|
---|
473 | length = strnlen(val, 254);
|
---|
474 | if (length > 0) {
|
---|
475 | opt = val;
|
---|
476 | retval = 1;
|
---|
477 | }
|
---|
478 | break;
|
---|
479 | // case OPTION_BOOLEAN: {
|
---|
480 | // static const char no_yes[] ALIGN1 = "no\0yes\0";
|
---|
481 | // buffer[0] = retval = index_in_strings(no_yes, val);
|
---|
482 | // retval++; /* 0 - bad; 1: "no" 2: "yes" */
|
---|
483 | // break;
|
---|
484 | // }
|
---|
485 | case OPTION_U8:
|
---|
486 | buffer[0] = strtoul(val, &endptr, 0);
|
---|
487 | retval = (endptr[0] == '\0');
|
---|
488 | break;
|
---|
489 | /* htonX are macros in older libc's, using temp var
|
---|
490 | * in code below for safety */
|
---|
491 | /* TODO: use bb_strtoX? */
|
---|
492 | case OPTION_U16: {
|
---|
493 | unsigned long tmp = strtoul(val, &endptr, 0);
|
---|
494 | *result_u16 = htons(tmp);
|
---|
495 | retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
|
---|
496 | break;
|
---|
497 | }
|
---|
498 | // case OPTION_S16: {
|
---|
499 | // long tmp = strtol(val, &endptr, 0);
|
---|
500 | // *result_u16 = htons(tmp);
|
---|
501 | // retval = (endptr[0] == '\0');
|
---|
502 | // break;
|
---|
503 | // }
|
---|
504 | case OPTION_U32: {
|
---|
505 | unsigned long tmp = strtoul(val, &endptr, 0);
|
---|
506 | *result_u32 = htonl(tmp);
|
---|
507 | retval = (endptr[0] == '\0');
|
---|
508 | break;
|
---|
509 | }
|
---|
510 | case OPTION_S32: {
|
---|
511 | long tmp = strtol(val, &endptr, 0);
|
---|
512 | *result_u32 = htonl(tmp);
|
---|
513 | retval = (endptr[0] == '\0');
|
---|
514 | break;
|
---|
515 | }
|
---|
516 | case OPTION_BIN: /* handled in attach_option() */
|
---|
517 | opt = val;
|
---|
518 | retval = 1;
|
---|
519 | default:
|
---|
520 | break;
|
---|
521 | }
|
---|
522 | if (retval)
|
---|
523 | attach_option(opt_list, optflag, opt, length);
|
---|
524 | } while (retval && optflag->flags & OPTION_LIST);
|
---|
525 |
|
---|
526 | return retval;
|
---|
527 | }
|
---|