blob: ae0e0d30637092d94d4dd5db8161ed0b1093f08c [file] [log] [blame]
Mike Frysinger7031f622006-05-08 03:20:50 +00001/* vi: set sw=4 ts=4: */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +01002/*
3 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
Mike Frysinger7031f622006-05-08 03:20:50 +00004 *
Denys Vlasenko0ef64bd2010-08-16 20:14:46 +02005 * Licensed under GPLv2, see file LICENSE in this source tree.
Mike Frysinger7031f622006-05-08 03:20:50 +00006 */
Mike Frysinger7031f622006-05-08 03:20:50 +00007#include "common.h"
Mike Frysinger7031f622006-05-08 03:20:50 +00008
Denys Vlasenkoac906fa2009-06-17 11:54:52 +02009#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
Denys Vlasenko6947d2c2009-06-17 13:24:03 +020010unsigned dhcp_verbose;
Denys Vlasenkoac906fa2009-06-17 11:54:52 +020011#endif
12
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000013const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
14 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
15};
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010016
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 */
Denys Vlasenkoc03602b2010-04-04 15:28:49 +020021const struct dhcp_optflag dhcp_optflags[] = {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010022 /* 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 */
Denys Vlasenko7280d202011-12-08 16:41:05 +010032 { OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010033 { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
Denys Vlasenko7280d202011-12-08 16:41:05 +010034 { OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010035 { 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 */
Denys Vlasenkocd4d78f2011-10-20 13:21:55 +020039//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?
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010042 { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
Vladislav Grishenko7d3a48a2010-09-26 00:15:12 +020043 { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
Denys Vlasenko7280d202011-12-08 16:41:05 +010044 { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010045 { 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:
Denys Vlasenko7280d202011-12-08 16:41:05 +010052 { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010053 { 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
Denys Vlasenko243ddcb2010-04-03 17:34:52 +020057 { OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
58 { OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010059#endif
Michael McTernanee0f4442011-12-16 17:10:09 +010060 { OPTION_STATIC_ROUTES | OPTION_LIST , 0x79 }, /* DHCP_STATIC_ROUTES */
Nigel Hathawayfb6b1732011-04-26 02:50:00 +020061#if ENABLE_FEATURE_UDHCP_8021Q
62 { OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */
63 { OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */
64#endif
Denys Vlasenko1f56e512011-10-19 22:40:35 +020065 { OPTION_6RD , 0xd4 }, /* DHCP_6RD */
Michael McTernanee0f4442011-12-16 17:10:09 +010066 { OPTION_STATIC_ROUTES | OPTION_LIST , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010067 { OPTION_STRING , 0xfc }, /* DHCP_WPAD */
68
69 /* Options below have no match in dhcp_option_strings[],
70 * are not passed to dhcpc scripts, and cannot be specified
71 * with "option XXX YYY" syntax in dhcpd config file.
72 * These entries are only used internally by udhcp[cd]
73 * to correctly encode options into packets.
74 */
75
76 { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
77 { OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
78 { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
Denys Vlasenkod3c5ab72010-10-20 02:03:30 +020079//looks like these opts will work just fine even without these defs:
80// { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
81// /* not really a string: */
82// { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010083 { 0, 0 } /* zeroed terminating entry */
84};
85
86/* Used for converting options from incoming packets to env variables
87 * for udhcpc stript, and for setting options for udhcpd via
88 * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
89 */
Denys Vlasenkoc03602b2010-04-04 15:28:49 +020090/* Must match dhcp_optflags[] order */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +010091const char dhcp_option_strings[] ALIGN1 =
92 "subnet" "\0" /* DHCP_SUBNET */
93 "timezone" "\0" /* DHCP_TIME_OFFSET */
94 "router" "\0" /* DHCP_ROUTER */
95// "timesrv" "\0" /* DHCP_TIME_SERVER */
96// "namesrv" "\0" /* DHCP_NAME_SERVER */
97 "dns" "\0" /* DHCP_DNS_SERVER */
98// "logsrv" "\0" /* DHCP_LOG_SERVER */
99// "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
100 "lprsrv" "\0" /* DHCP_LPR_SERVER */
101 "hostname" "\0" /* DHCP_HOST_NAME */
102 "bootsize" "\0" /* DHCP_BOOT_SIZE */
103 "domain" "\0" /* DHCP_DOMAIN_NAME */
104 "swapsrv" "\0" /* DHCP_SWAP_SERVER */
105 "rootpath" "\0" /* DHCP_ROOT_PATH */
106 "ipttl" "\0" /* DHCP_IP_TTL */
107 "mtu" "\0" /* DHCP_MTU */
108 "broadcast" "\0" /* DHCP_BROADCAST */
Vladislav Grishenko7d3a48a2010-09-26 00:15:12 +0200109 "routes" "\0" /* DHCP_ROUTES */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100110 "nisdomain" "\0" /* DHCP_NIS_DOMAIN */
111 "nissrv" "\0" /* DHCP_NIS_SERVER */
112 "ntpsrv" "\0" /* DHCP_NTP_SERVER */
113 "wins" "\0" /* DHCP_WINS_SERVER */
114 "lease" "\0" /* DHCP_LEASE_TIME */
115 "serverid" "\0" /* DHCP_SERVER_ID */
116 "message" "\0" /* DHCP_ERR_MESSAGE */
117 "tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
118 "bootfile" "\0" /* DHCP_BOOT_FILE */
119// "userclass" "\0" /* DHCP_USER_CLASS */
120#if ENABLE_FEATURE_UDHCP_RFC3397
121 "search" "\0" /* DHCP_DOMAIN_SEARCH */
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200122// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
123// is not handled yet by "string->option" conversion code:
Denys Vlasenko5ab6b0f2010-04-06 16:52:59 +0200124 "sipsrv" "\0" /* DHCP_SIP_SERVERS */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100125#endif
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200126 "staticroutes" "\0"/* DHCP_STATIC_ROUTES */
Nigel Hathawayfb6b1732011-04-26 02:50:00 +0200127#if ENABLE_FEATURE_UDHCP_8021Q
128 "vlanid" "\0" /* DHCP_VLAN_ID */
129 "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */
130#endif
Denys Vlasenko1f56e512011-10-19 22:40:35 +0200131 "ip6rd" "\0" /* DHCP_6RD */
Vladislav Grishenko7d3a48a2010-09-26 00:15:12 +0200132 "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200133 "wpad" "\0" /* DHCP_WPAD */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100134 ;
135
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200136/* Lengths of the option types in binary form.
137 * Used by:
138 * udhcp_str2optset: to determine how many bytes to allocate.
139 * xmalloc_optname_optval: to estimate string length
140 * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
141 * is the number of elements, multiply in by one element's string width
142 * (len_of_option_as_string[opt_type]) and you know how wide string you need.
143 */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100144const uint8_t dhcp_option_lengths[] ALIGN1 = {
145 [OPTION_IP] = 4,
146 [OPTION_IP_PAIR] = 8,
147// [OPTION_BOOLEAN] = 1,
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200148 [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
Denys Vlasenko7280d202011-12-08 16:41:05 +0100149 [OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100150#if ENABLE_FEATURE_UDHCP_RFC3397
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200151 [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
152 [OPTION_SIP_SERVERS] = 1,
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100153#endif
154 [OPTION_U8] = 1,
155 [OPTION_U16] = 2,
156// [OPTION_S16] = 2,
157 [OPTION_U32] = 4,
158 [OPTION_S32] = 4,
159 /* Just like OPTION_STRING, we use minimum length here */
160 [OPTION_STATIC_ROUTES] = 5,
Denys Vlasenko1f56e512011-10-19 22:40:35 +0200161 [OPTION_6RD] = 22, /* ignored by udhcp_str2optset */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100162};
163
164
165#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
166static void log_option(const char *pfx, const uint8_t *opt)
167{
168 if (dhcp_verbose >= 2) {
169 char buf[256 * 2 + 2];
170 *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
171 bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
172 }
173}
174#else
175# define log_option(pfx, opt) ((void)0)
176#endif
177
Denys Vlasenko9107b632010-03-27 23:23:41 +0100178unsigned FAST_FUNC udhcp_option_idx(const char *name)
179{
180 int n = index_in_strings(dhcp_option_strings, name);
181 if (n >= 0)
182 return n;
183
184 {
185 char buf[sizeof(dhcp_option_strings)];
186 char *d = buf;
187 const char *s = dhcp_option_strings;
188 while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
189 *d++ = (*s == '\0' ? ' ' : *s);
190 s++;
191 }
192 *d = '\0';
193 bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
194 }
195}
196
Denys Vlasenkob7d19cc2010-05-30 23:41:23 +0200197/* Get an option with bounds checking (warning, result is not aligned) */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100198uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
199{
200 uint8_t *optionptr;
201 int len;
202 int rem;
203 int overload = 0;
204 enum {
205 FILE_FIELD101 = FILE_FIELD * 0x101,
206 SNAME_FIELD101 = SNAME_FIELD * 0x101,
207 };
208
209 /* option bytes: [code][len][data1][data2]..[dataLEN] */
210 optionptr = packet->options;
211 rem = sizeof(packet->options);
212 while (1) {
213 if (rem <= 0) {
214 bb_error_msg("bad packet, malformed option field");
215 return NULL;
216 }
217 if (optionptr[OPT_CODE] == DHCP_PADDING) {
218 rem--;
219 optionptr++;
220 continue;
221 }
222 if (optionptr[OPT_CODE] == DHCP_END) {
223 if ((overload & FILE_FIELD101) == FILE_FIELD) {
224 /* can use packet->file, and didn't look at it yet */
225 overload |= FILE_FIELD101; /* "we looked at it" */
226 optionptr = packet->file;
227 rem = sizeof(packet->file);
228 continue;
229 }
230 if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
231 /* can use packet->sname, and didn't look at it yet */
232 overload |= SNAME_FIELD101; /* "we looked at it" */
233 optionptr = packet->sname;
234 rem = sizeof(packet->sname);
235 continue;
236 }
237 break;
238 }
239 len = 2 + optionptr[OPT_LEN];
240 rem -= len;
241 if (rem < 0)
242 continue; /* complain and return NULL */
243
244 if (optionptr[OPT_CODE] == code) {
245 log_option("Option found", optionptr);
246 return optionptr + OPT_DATA;
247 }
248
249 if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
250 overload |= optionptr[OPT_DATA];
251 /* fall through */
252 }
253 optionptr += len;
254 }
255
256 /* log3 because udhcpc uses it a lot - very noisy */
257 log3("Option 0x%02x not found", code);
258 return NULL;
259}
260
Denys Vlasenkob7d19cc2010-05-30 23:41:23 +0200261/* Return the position of the 'end' option (no bounds checking) */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100262int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
263{
264 int i = 0;
265
266 while (optionptr[i] != DHCP_END) {
267 if (optionptr[i] != DHCP_PADDING)
268 i += optionptr[i + OPT_LEN] + OPT_DATA-1;
269 i++;
270 }
271 return i;
272}
273
274/* Add an option (supplied in binary form) to the options.
275 * Option format: [code][len][data1][data2]..[dataLEN]
276 */
Denys Vlasenko7724c762010-03-26 09:32:09 +0100277void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100278{
279 unsigned len;
Denys Vlasenko7724c762010-03-26 09:32:09 +0100280 uint8_t *optionptr = packet->options;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100281 unsigned end = udhcp_end_option(optionptr);
282
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100283 len = OPT_DATA + addopt[OPT_LEN];
Denys Vlasenko7724c762010-03-26 09:32:09 +0100284 /* end position + (option code/length + addopt length) + end option */
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100285 if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
Denys Vlasenko7724c762010-03-26 09:32:09 +0100286//TODO: learn how to use overflow option if we exhaust packet->options[]
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100287 bb_error_msg("option 0x%02x did not fit into the packet",
288 addopt[OPT_CODE]);
289 return;
290 }
291 log_option("Adding option", addopt);
292 memcpy(optionptr + end, addopt, len);
293 optionptr[end + len] = DHCP_END;
294}
295
Denys Vlasenko7724c762010-03-26 09:32:09 +0100296/* Add an one to four byte option to a packet */
297void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100298{
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200299 const struct dhcp_optflag *dh;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100300
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200301 for (dh = dhcp_optflags; dh->code; dh++) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100302 if (dh->code == code) {
303 uint8_t option[6], len;
304
305 option[OPT_CODE] = code;
306 len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
307 option[OPT_LEN] = len;
308 if (BB_BIG_ENDIAN)
309 data <<= 8 * (4 - len);
310 /* Assignment is unaligned! */
311 move_to_unaligned32(&option[OPT_DATA], data);
Denys Vlasenko7724c762010-03-26 09:32:09 +0100312 udhcp_add_binary_option(packet, option);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100313 return;
314 }
315 }
316
317 bb_error_msg("can't add option 0x%02x", code);
318}
319
320/* Find option 'code' in opt_list */
Denys Vlasenko7724c762010-03-26 09:32:09 +0100321struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100322{
323 while (opt_list && opt_list->data[OPT_CODE] < code)
324 opt_list = opt_list->next;
325
326 if (opt_list && opt_list->data[OPT_CODE] == code)
327 return opt_list;
328 return NULL;
329}
330
331/* Parse string to IP in network order */
332int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
333{
334 len_and_sockaddr *lsa;
335
336 lsa = host_and_af2sockaddr(str, 0, AF_INET);
337 if (!lsa)
338 return 0;
Michael McTernanee0f4442011-12-16 17:10:09 +0100339 /* arg maybe unaligned */
340 move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100341 free(lsa);
342 return 1;
343}
344
345/* udhcp_str2optset:
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200346 * Parse string option representation to binary form and add it to opt_list.
347 * Called to parse "udhcpc -x OPTNAME:OPTVAL"
348 * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100349 */
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200350/* helper for the helper */
351static char *allocate_tempopt_if_needed(
352 const struct dhcp_optflag *optflag,
353 char *buffer,
354 int *length_p)
355{
356 char *allocated = NULL;
357 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
358 const char *end;
359 allocated = xstrdup(buffer); /* more than enough */
360 end = hex2bin(allocated, buffer, 255);
361 if (errno)
362 bb_error_msg_and_die("malformed hex string '%s'", buffer);
363 *length_p = end - allocated;
364 }
365 return allocated;
366}
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100367/* helper: add an option to the opt_list */
368static NOINLINE void attach_option(
369 struct option_set **opt_list,
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200370 const struct dhcp_optflag *optflag,
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100371 char *buffer,
372 int length)
373{
374 struct option_set *existing, *new, **curr;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100375 char *allocated = NULL;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100376
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200377 existing = udhcp_find_option(*opt_list, optflag->code);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100378 if (!existing) {
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200379 log2("Attaching option %02x to list", optflag->code);
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200380 allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100381#if ENABLE_FEATURE_UDHCP_RFC3397
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200382 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100383 /* reuse buffer and length for RFC1035-formatted string */
384 allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
385 }
386#endif
387 /* make a new option */
388 new = xmalloc(sizeof(*new));
389 new->data = xmalloc(length + OPT_DATA);
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200390 new->data[OPT_CODE] = optflag->code;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100391 new->data[OPT_LEN] = length;
Denys Vlasenkofbea2202011-02-06 18:00:58 +0100392 memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100393
394 curr = opt_list;
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200395 while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100396 curr = &(*curr)->next;
397
398 new->next = *curr;
399 *curr = new;
400 goto ret;
401 }
402
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200403 if (optflag->flags & OPTION_LIST) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100404 unsigned old_len;
405
406 /* add it to an existing option */
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200407 log2("Attaching option %02x to existing member of list", optflag->code);
408 allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100409 old_len = existing->data[OPT_LEN];
410#if ENABLE_FEATURE_UDHCP_RFC3397
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200411 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100412 /* reuse buffer and length for RFC1035-formatted string */
413 allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
414 }
415#endif
416 if (old_len + length < 255) {
417 /* actually 255 is ok too, but adding a space can overlow it */
418
419 existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
Denys Vlasenko7280d202011-12-08 16:41:05 +0100420 if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
421 || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
422 ) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100423 /* add space separator between STRING options in a list */
424 existing->data[OPT_DATA + old_len] = ' ';
425 old_len++;
426 }
427 memcpy(existing->data + OPT_DATA + old_len, buffer, length);
428 existing->data[OPT_LEN] = old_len + length;
429 } /* else, ignore the data, we could put this in a second option in the future */
430 } /* else, ignore the new data */
431
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200432 ret:
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100433 free(allocated);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100434}
435
436int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
437{
438 struct option_set **opt_list = arg;
Michael McTernanee0f4442011-12-16 17:10:09 +0100439 char *opt, *val;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100440 char *str;
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200441 const struct dhcp_optflag *optflag;
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200442 struct dhcp_optflag bin_optflag;
443 unsigned optcode;
Denys Vlasenko9107b632010-03-27 23:23:41 +0100444 int retval, length;
Michael McTernanee0f4442011-12-16 17:10:09 +0100445 /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
446 char buffer[9] ALIGNED(4);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100447 uint16_t *result_u16 = (uint16_t *) buffer;
448 uint32_t *result_u32 = (uint32_t *) buffer;
449
450 /* Cheat, the only *const* str possible is "" */
451 str = (char *) const_str;
452 opt = strtok(str, " \t=");
453 if (!opt)
454 return 0;
455
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200456 optcode = bb_strtou(opt, NULL, 0);
457 if (!errno && optcode < 255) {
458 /* Raw (numeric) option code */
459 bin_optflag.flags = OPTION_BIN;
460 bin_optflag.code = optcode;
461 optflag = &bin_optflag;
462 } else {
463 optflag = &dhcp_optflags[udhcp_option_idx(opt)];
464 }
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100465
466 retval = 0;
467 do {
468 val = strtok(NULL, ", \t");
469 if (!val)
470 break;
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200471 length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100472 retval = 0;
473 opt = buffer; /* new meaning for variable opt */
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200474 switch (optflag->flags & OPTION_TYPE_MASK) {
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100475 case OPTION_IP:
476 retval = udhcp_str2nip(val, buffer);
477 break;
478 case OPTION_IP_PAIR:
479 retval = udhcp_str2nip(val, buffer);
480 val = strtok(NULL, ", \t/-");
481 if (!val)
482 retval = 0;
483 if (retval)
484 retval = udhcp_str2nip(val, buffer + 4);
485 break;
486 case OPTION_STRING:
Denys Vlasenko7280d202011-12-08 16:41:05 +0100487 case OPTION_STRING_HOST:
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100488#if ENABLE_FEATURE_UDHCP_RFC3397
Denys Vlasenko243ddcb2010-04-03 17:34:52 +0200489 case OPTION_DNS_STRING:
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100490#endif
491 length = strnlen(val, 254);
492 if (length > 0) {
493 opt = val;
494 retval = 1;
495 }
496 break;
497// case OPTION_BOOLEAN: {
Denys Vlasenko8a659f62010-04-03 00:52:16 +0200498// static const char no_yes[] ALIGN1 = "no\0yes\0";
499// buffer[0] = retval = index_in_strings(no_yes, val);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100500// retval++; /* 0 - bad; 1: "no" 2: "yes" */
501// break;
502// }
503 case OPTION_U8:
Michael McTernanee0f4442011-12-16 17:10:09 +0100504 buffer[0] = bb_strtou32(val, NULL, 0);
505 retval = (errno == 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100506 break;
507 /* htonX are macros in older libc's, using temp var
508 * in code below for safety */
509 /* TODO: use bb_strtoX? */
510 case OPTION_U16: {
Michael McTernanee0f4442011-12-16 17:10:09 +0100511 uint32_t tmp = bb_strtou32(val, NULL, 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100512 *result_u16 = htons(tmp);
Michael McTernanee0f4442011-12-16 17:10:09 +0100513 retval = (errno == 0 /*&& tmp < 0x10000*/);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100514 break;
515 }
516// case OPTION_S16: {
Michael McTernanee0f4442011-12-16 17:10:09 +0100517// long tmp = bb_strtoi32(val, NULL, 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100518// *result_u16 = htons(tmp);
Michael McTernanee0f4442011-12-16 17:10:09 +0100519// retval = (errno == 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100520// break;
521// }
522 case OPTION_U32: {
Michael McTernanee0f4442011-12-16 17:10:09 +0100523 uint32_t tmp = bb_strtou32(val, NULL, 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100524 *result_u32 = htonl(tmp);
Michael McTernanee0f4442011-12-16 17:10:09 +0100525 retval = (errno == 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100526 break;
527 }
528 case OPTION_S32: {
Michael McTernanee0f4442011-12-16 17:10:09 +0100529 int32_t tmp = bb_strtoi32(val, NULL, 0);
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100530 *result_u32 = htonl(tmp);
Michael McTernanee0f4442011-12-16 17:10:09 +0100531 retval = (errno == 0);
532 break;
533 }
534 case OPTION_STATIC_ROUTES: {
535 /* Input: "a.b.c.d/m" */
536 /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
537 unsigned mask;
538 char *slash = strchr(val, '/');
539 if (slash) {
540 *slash = '\0';
541 retval = udhcp_str2nip(val, buffer + 1);
542 buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
543 val = strtok(NULL, ", \t/-");
544 if (!val || mask > 32 || errno)
545 retval = 0;
546 if (retval) {
547 length = ((mask + 7) >> 3) + 5;
548 retval = udhcp_str2nip(val, buffer + (length - 4));
549 }
550 }
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100551 break;
552 }
Denys Vlasenko4f3aa512010-04-04 15:31:12 +0200553 case OPTION_BIN: /* handled in attach_option() */
554 opt = val;
555 retval = 1;
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100556 default:
557 break;
558 }
559 if (retval)
Denys Vlasenkoc03602b2010-04-04 15:28:49 +0200560 attach_option(opt_list, optflag, opt, length);
Michael McTernanee0f4442011-12-16 17:10:09 +0100561 } while (retval && (optflag->flags & OPTION_LIST));
Denys Vlasenkoa8f6b992010-03-26 08:35:24 +0100562
563 return retval;
564}
Denys Vlasenkoa092a892011-11-16 20:17:12 +0100565
566/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
567int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
568{
569 char hexstrbuf[16 * 2];
570 bin2hex(hexstrbuf, (void*)ip, 16);
571 return sprintf(dest, /* "%s" */
572 "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
573 /* pre, */
574 hexstrbuf + 0 * 4,
575 hexstrbuf + 1 * 4,
576 hexstrbuf + 2 * 4,
577 hexstrbuf + 3 * 4,
578 hexstrbuf + 4 * 4,
579 hexstrbuf + 5 * 4,
580 hexstrbuf + 6 * 4,
581 hexstrbuf + 7 * 4
582 );
583}