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8754 loader: pass a "illumos" user-class in PXE dhcp request
[unleashed.git] / usr / src / boot / lib / libstand / bootp.c
blob2dac1229701d749a04eef586114243167e56018b
1 /*
2 * Copyright (c) 1992 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <sys/cdefs.h>
35
36 #include <stddef.h>
37 #include <sys/types.h>
38 #include <sys/limits.h>
39 #include <sys/endian.h>
40 #include <netinet/in.h>
41 #include <netinet/in_systm.h>
42
43 #include <string.h>
44
45 #define BOOTP_DEBUGxx
46 #define SUPPORT_DHCP
47
48 #define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
49 #define DHCP_ENV_PXE 10 /* assume pxe vendor options */
50 #define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options */
51 /* set DHCP_ENV to one of the values above to export dhcp options to kenv */
52 #define DHCP_ENV DHCP_ENV_NO_VENDOR
53
54 #include "stand.h"
55 #include "net.h"
56 #include "netif.h"
57 #include "bootp.h"
58
59
60 struct in_addr servip;
61
62 static time_t bot;
63
64 static char vm_rfc1048[4] = VM_RFC1048;
65 #ifdef BOOTP_VEND_CMU
66 static char vm_cmu[4] = VM_CMU;
67 #endif
68
69 /* Local forwards */
70 static ssize_t bootpsend(struct iodesc *, void *, size_t);
71 static ssize_t bootprecv(struct iodesc *, void **, void **, time_t);
72 static int vend_rfc1048(u_char *, u_int);
73 #ifdef BOOTP_VEND_CMU
74 static void vend_cmu(u_char *);
75 #endif
76
77 #ifdef DHCP_ENV /* export the dhcp response to kenv */
78 struct dhcp_opt;
79 static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
80 #else
81 #define setenv_(a, b, c)
82 #endif
83
84 #ifdef SUPPORT_DHCP
85 static char expected_dhcpmsgtype = -1, dhcp_ok;
86 struct in_addr dhcp_serverip;
87 #endif
88 struct bootp *bootp_response;
89 size_t bootp_response_size;
90
91 /* Fetch required bootp infomation */
92 void
93 bootp(int sock, int flag)
94 {
95 void *pkt;
96 struct iodesc *d;
97 struct bootp *bp;
98 struct {
99 u_char header[HEADER_SIZE];
100 struct bootp wbootp;
101 } wbuf;
102 struct bootp *rbootp;
103
104 #ifdef BOOTP_DEBUG
105 if (debug)
106 printf("bootp: socket=%d\n", sock);
107 #endif
108 if (!bot)
109 bot = getsecs();
110
111 if (!(d = socktodesc(sock))) {
112 printf("bootp: bad socket. %d\n", sock);
113 return;
114 }
115 #ifdef BOOTP_DEBUG
116 if (debug)
117 printf("bootp: d=%lx\n", (long)d);
118 #endif
119
120 bp = &wbuf.wbootp;
121 bzero(bp, sizeof(*bp));
122
123 bp->bp_op = BOOTREQUEST;
124 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
125 bp->bp_hlen = 6;
126 bp->bp_xid = htonl(d->xid);
127 MACPY(d->myea, bp->bp_chaddr);
128 strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
129 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
130 #ifdef SUPPORT_DHCP
131 bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
132 bp->bp_vend[5] = 1;
133 bp->bp_vend[6] = DHCPDISCOVER;
134
135 /*
136 * If we are booting from PXE, we want to send the string
137 * 'PXEClient' to the DHCP server so you have the option of
138 * only responding to PXE aware dhcp requests.
139 */
140 if (flag & BOOTP_PXE) {
141 bp->bp_vend[7] = TAG_CLASSID;
142 bp->bp_vend[8] = 9;
143 bcopy("PXEClient", &bp->bp_vend[9], 9);
144 bp->bp_vend[18] = TAG_USER_CLASS;
145 /* len of each user class + number of user class */
146 bp->bp_vend[19] = 8;
147 /* len of the first user class */
148 bp->bp_vend[20] = 7;
149 bcopy("illumos", &bp->bp_vend[21], 7);
150 bp->bp_vend[28] = TAG_PARAM_REQ;
151 bp->bp_vend[29] = 7;
152 bp->bp_vend[30] = TAG_ROOTPATH;
153 bp->bp_vend[31] = TAG_HOSTNAME;
154 bp->bp_vend[32] = TAG_SWAPSERVER;
155 bp->bp_vend[33] = TAG_GATEWAY;
156 bp->bp_vend[34] = TAG_SUBNET_MASK;
157 bp->bp_vend[35] = TAG_INTF_MTU;
158 bp->bp_vend[36] = TAG_SERVERID;
159 bp->bp_vend[37] = TAG_END;
160 } else
161 bp->bp_vend[7] = TAG_END;
162 #else
163 bp->bp_vend[4] = TAG_END;
164 #endif
165
166 d->myip.s_addr = INADDR_ANY;
167 d->myport = htons(IPPORT_BOOTPC);
168 d->destip.s_addr = INADDR_BROADCAST;
169 d->destport = htons(IPPORT_BOOTPS);
170
171 #ifdef SUPPORT_DHCP
172 expected_dhcpmsgtype = DHCPOFFER;
173 dhcp_ok = 0;
174 #endif
175
176 if(sendrecv(d,
177 bootpsend, bp, sizeof(*bp),
178 bootprecv, &pkt, (void **)&rbootp) == -1) {
179 printf("bootp: no reply\n");
180 return;
181 }
182
183 #ifdef SUPPORT_DHCP
184 if(dhcp_ok) {
185 u_int32_t leasetime;
186 bp->bp_vend[6] = DHCPREQUEST;
187 bp->bp_vend[7] = TAG_REQ_ADDR;
188 bp->bp_vend[8] = 4;
189 bcopy(&rbootp->bp_yiaddr, &bp->bp_vend[9], 4);
190 bp->bp_vend[13] = TAG_SERVERID;
191 bp->bp_vend[14] = 4;
192 bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
193 bp->bp_vend[19] = TAG_LEASETIME;
194 bp->bp_vend[20] = 4;
195 leasetime = htonl(300);
196 bcopy(&leasetime, &bp->bp_vend[21], 4);
197 if (flag & BOOTP_PXE) {
198 bp->bp_vend[25] = TAG_CLASSID;
199 bp->bp_vend[26] = 9;
200 bcopy("PXEClient", &bp->bp_vend[27], 9);
201 bp->bp_vend[36] = TAG_END;
202 } else
203 bp->bp_vend[25] = TAG_END;
204
205 expected_dhcpmsgtype = DHCPACK;
206
207 free(pkt);
208 if(sendrecv(d,
209 bootpsend, bp, sizeof(*bp),
210 bootprecv, &pkt, (void **)&rbootp) == -1) {
211 printf("DHCPREQUEST failed\n");
212 return;
213 }
214 }
215 #endif
216
217 myip = d->myip = rbootp->bp_yiaddr;
218 servip = rbootp->bp_siaddr;
219 if (rootip.s_addr == INADDR_ANY)
220 rootip = servip;
221 bcopy(rbootp->bp_file, bootfile, sizeof(bootfile));
222 bootfile[sizeof(bootfile) - 1] = '\0';
223
224 if (!netmask) {
225 if (IN_CLASSA(ntohl(myip.s_addr)))
226 netmask = htonl(IN_CLASSA_NET);
227 else if (IN_CLASSB(ntohl(myip.s_addr)))
228 netmask = htonl(IN_CLASSB_NET);
229 else
230 netmask = htonl(IN_CLASSC_NET);
231 #ifdef BOOTP_DEBUG
232 if (debug)
233 printf("'native netmask' is %s\n", intoa(netmask));
234 #endif
235 }
236
237 #ifdef BOOTP_DEBUG
238 if (debug)
239 printf("mask: %s\n", intoa(netmask));
240 #endif
241
242 /* We need a gateway if root is on a different net */
243 if (!SAMENET(myip, rootip, netmask)) {
244 #ifdef BOOTP_DEBUG
245 if (debug)
246 printf("need gateway for root ip\n");
247 #endif
248 }
249
250 /* Toss gateway if on a different net */
251 if (!SAMENET(myip, gateip, netmask)) {
252 #ifdef BOOTP_DEBUG
253 if (debug)
254 printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
255 #endif
256 gateip.s_addr = 0;
257 }
258
259 /* Bump xid so next request will be unique. */
260 ++d->xid;
261 free(pkt);
262 }
263
264 /* Transmit a bootp request */
265 static ssize_t
266 bootpsend(struct iodesc *d, void *pkt, size_t len)
267 {
268 struct bootp *bp;
269
270 #ifdef BOOTP_DEBUG
271 if (debug)
272 printf("bootpsend: d=%lx called.\n", (long)d);
273 #endif
274
275 bp = pkt;
276 bp->bp_secs = htons((u_short)(getsecs() - bot));
277
278 #ifdef BOOTP_DEBUG
279 if (debug)
280 printf("bootpsend: calling sendudp\n");
281 #endif
282
283 return (sendudp(d, pkt, len));
284 }
285
286 static ssize_t
287 bootprecv(struct iodesc *d, void **pkt, void **payload, time_t tleft)
288 {
289 ssize_t n;
290 struct bootp *bp;
291 void *ptr;
292
293 #ifdef BOOTP_DEBUG
294 if (debug)
295 printf("bootp_recvoffer: called\n");
296 #endif
297
298 ptr = NULL;
299 n = readudp(d, &ptr, (void **)&bp, tleft);
300 if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
301 goto bad;
302
303 #ifdef BOOTP_DEBUG
304 if (debug)
305 printf("bootprecv: checked. bp = %p, n = %zd\n", bp, n);
306 #endif
307 if (bp->bp_xid != htonl(d->xid)) {
308 #ifdef BOOTP_DEBUG
309 if (debug) {
310 printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
311 d->xid, ntohl(bp->bp_xid));
312 }
313 #endif
314 goto bad;
315 }
316
317 #ifdef BOOTP_DEBUG
318 if (debug)
319 printf("bootprecv: got one!\n");
320 #endif
321
322 /* Suck out vendor info */
323 if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
324 int vsize = n - offsetof(struct bootp, bp_vend);
325 if(vend_rfc1048(bp->bp_vend, vsize) != 0)
326 goto bad;
327
328 /* Save copy of bootp reply or DHCP ACK message */
329 if (bp->bp_op == BOOTREPLY &&
330 ((dhcp_ok == 1 && expected_dhcpmsgtype == DHCPACK) ||
331 dhcp_ok == 0)) {
332 free(bootp_response);
333 bootp_response = malloc(n);
334 if (bootp_response != NULL) {
335 bootp_response_size = n;
336 bcopy(bp, bootp_response, bootp_response_size);
337 }
338 }
339 }
340 #ifdef BOOTP_VEND_CMU
341 else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
342 vend_cmu(bp->bp_vend);
343 #endif
344 else
345 printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
346
347 *pkt = ptr;
348 *payload = bp;
349 return(n);
350 bad:
351 free(ptr);
352 errno = 0;
353 return (-1);
354 }
355
356 int
357 dhcp_try_rfc1048(uint8_t *cp, size_t len)
358 {
359
360 expected_dhcpmsgtype = DHCPACK;
361 if (bcmp(vm_rfc1048, cp, sizeof (vm_rfc1048)) == 0) {
362 return (vend_rfc1048(cp, len));
363 }
364 return (-1);
365 }
366
367 static int
368 vend_rfc1048(u_char *cp, u_int len)
369 {
370 u_char *ep;
371 int size;
372 u_char tag;
373 const char *val;
374
375 #ifdef BOOTP_DEBUG
376 if (debug)
377 printf("vend_rfc1048 bootp info. len=%d\n", len);
378 #endif
379 ep = cp + len;
380
381 /* Step over magic cookie */
382 cp += sizeof(int);
383
384 setenv_(cp, ep, NULL);
385
386 while (cp < ep) {
387 tag = *cp++;
388 size = *cp++;
389 if (tag == TAG_END)
390 break;
391
392 if (tag == TAG_SUBNET_MASK) {
393 bcopy(cp, &netmask, sizeof(netmask));
394 }
395 if (tag == TAG_GATEWAY) {
396 bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
397 }
398 if (tag == TAG_SWAPSERVER) {
399 /* let it override bp_siaddr */
400 bcopy(cp, &rootip.s_addr, sizeof(rootip.s_addr));
401 }
402 if (tag == TAG_ROOTPATH) {
403 if ((val = getenv("dhcp.root-path")) == NULL)
404 val = (const char *)cp;
405 strlcpy(rootpath, val, sizeof(rootpath));
406 }
407 if (tag == TAG_HOSTNAME) {
408 if ((val = getenv("dhcp.host-name")) == NULL)
409 val = (const char *)cp;
410 strlcpy(hostname, val, sizeof(hostname));
411 }
412 if (tag == TAG_INTF_MTU) {
413 intf_mtu = 0;
414 if ((val = getenv("dhcp.interface-mtu")) != NULL) {
415 unsigned long tmp;
416 char *end;
417
418 errno = 0;
419 /*
420 * Do not allow MTU to exceed max IPv4 packet
421 * size, max value of 16-bit word.
422 */
423 tmp = strtoul(val, &end, 0);
424 if (errno != 0 ||
425 *val == '\0' || *end != '\0' ||
426 tmp > USHRT_MAX) {
427 printf("%s: bad value: \"%s\", "
428 "ignoring\n",
429 "dhcp.interface-mtu", val);
430 } else {
431 intf_mtu = (u_int)tmp;
432 }
433 }
434 if (intf_mtu == 0)
435 intf_mtu = be16dec(cp);
436 }
437 #ifdef SUPPORT_DHCP
438 if (tag == TAG_DHCP_MSGTYPE) {
439 if(*cp != expected_dhcpmsgtype)
440 return(-1);
441 dhcp_ok = 1;
442 }
443 if (tag == TAG_SERVERID) {
444 bcopy(cp, &dhcp_serverip.s_addr,
445 sizeof(dhcp_serverip.s_addr));
446 }
447 #endif
448 cp += size;
449 }
450 return(0);
451 }
452
453 #ifdef BOOTP_VEND_CMU
454 static void
455 vend_cmu(u_char *cp)
456 {
457 struct cmu_vend *vp;
458
459 #ifdef BOOTP_DEBUG
460 if (debug)
461 printf("vend_cmu bootp info.\n");
462 #endif
463 vp = (struct cmu_vend *)cp;
464
465 if (vp->v_smask.s_addr != 0) {
466 netmask = vp->v_smask.s_addr;
467 }
468 if (vp->v_dgate.s_addr != 0) {
469 gateip = vp->v_dgate;
470 }
471 }
472 #endif
473
474 #ifdef DHCP_ENV
475 /*
476 * Parse DHCP options and store them into kenv variables.
477 * Original code from Danny Braniss, modifications by Luigi Rizzo.
478 *
479 * The parser is driven by tables which specify the type and name of
480 * each dhcp option and how it appears in kenv.
481 * The first entry in the list contains the prefix used to set the kenv
482 * name (including the . if needed), the last entry must have a 0 tag.
483 * Entries do not need to be sorted though it helps for readability.
484 *
485 * Certain vendor-specific tables can be enabled according to DHCP_ENV.
486 * Set it to 0 if you don't want any.
487 */
488 enum opt_fmt { __NONE = 0,
489 __8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
490 __IP, /* IPv4 address */
491 __TXT, /* C string */
492 __BYTES, /* byte sequence, printed %02x */
493 __INDIR, /* name=value */
494 __ILIST, /* name=value;name=value ... */
495 __VE, /* vendor specific, recurse */
496 };
497
498 struct dhcp_opt {
499 uint8_t tag;
500 uint8_t fmt;
501 const char *desc;
502 };
503
504 static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
505 #if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
506 {0, 0, "FreeBSD"}, /* prefix */
507 {1, __TXT, "kernel"},
508 {2, __TXT, "kernelname"},
509 {3, __TXT, "kernel_options"},
510 {4, __IP, "usr-ip"},
511 {5, __TXT, "conf-path"},
512 {6, __TXT, "rc.conf0"},
513 {7, __TXT, "rc.conf1"},
514 {8, __TXT, "rc.conf2"},
515 {9, __TXT, "rc.conf3"},
516 {10, __TXT, "rc.conf4"},
517 {11, __TXT, "rc.conf5"},
518 {12, __TXT, "rc.conf6"},
519 {13, __TXT, "rc.conf7"},
520 {14, __TXT, "rc.conf8"},
521 {15, __TXT, "rc.conf9"},
522
523 {20, __TXT, "boot.nfsroot.options"},
524
525 {245, __INDIR, ""},
526 {246, __INDIR, ""},
527 {247, __INDIR, ""},
528 {248, __INDIR, ""},
529 {249, __INDIR, ""},
530 {250, __INDIR, ""},
531 {251, __INDIR, ""},
532 {252, __INDIR, ""},
533 {253, __INDIR, ""},
534 {254, __INDIR, ""},
535
536 #elif DHCP_ENV == DHCP_ENV_PXE /* some pxe options, RFC4578 */
537 {0, 0, "pxe"}, /* prefix */
538 {93, __16, "system-architecture"},
539 {94, __BYTES, "network-interface"},
540 {97, __BYTES, "machine-identifier"},
541 #else /* default (empty) table */
542 {0, 0, "dhcp.vendor."}, /* prefix */
543 #endif
544 {0, __TXT, "%soption-%d"}
545 };
546
547 static struct dhcp_opt dhcp_opt[] = {
548 /* DHCP Option names, formats and codes, from RFC2132. */
549 {0, 0, "dhcp."}, // prefix
550 {1, __IP, "subnet-mask"},
551 {2, __32, "time-offset"}, /* this is signed */
552 {3, __IP, "routers"},
553 {4, __IP, "time-servers"},
554 {5, __IP, "ien116-name-servers"},
555 {6, __IP, "domain-name-servers"},
556 {7, __IP, "log-servers"},
557 {8, __IP, "cookie-servers"},
558 {9, __IP, "lpr-servers"},
559 {10, __IP, "impress-servers"},
560 {11, __IP, "resource-location-servers"},
561 {12, __TXT, "host-name"},
562 {13, __16, "boot-size"},
563 {14, __TXT, "merit-dump"},
564 {15, __TXT, "domain-name"},
565 {16, __IP, "swap-server"},
566 {17, __TXT, "root-path"},
567 {18, __TXT, "extensions-path"},
568 {19, __8, "ip-forwarding"},
569 {20, __8, "non-local-source-routing"},
570 {21, __IP, "policy-filter"},
571 {22, __16, "max-dgram-reassembly"},
572 {23, __8, "default-ip-ttl"},
573 {24, __32, "path-mtu-aging-timeout"},
574 {25, __16, "path-mtu-plateau-table"},
575 {26, __16, "interface-mtu"},
576 {27, __8, "all-subnets-local"},
577 {28, __IP, "broadcast-address"},
578 {29, __8, "perform-mask-discovery"},
579 {30, __8, "mask-supplier"},
580 {31, __8, "perform-router-discovery"},
581 {32, __IP, "router-solicitation-address"},
582 {33, __IP, "static-routes"},
583 {34, __8, "trailer-encapsulation"},
584 {35, __32, "arp-cache-timeout"},
585 {36, __8, "ieee802-3-encapsulation"},
586 {37, __8, "default-tcp-ttl"},
587 {38, __32, "tcp-keepalive-interval"},
588 {39, __8, "tcp-keepalive-garbage"},
589 {40, __TXT, "nis-domain"},
590 {41, __IP, "nis-servers"},
591 {42, __IP, "ntp-servers"},
592 {43, __VE, "vendor-encapsulated-options"},
593 {44, __IP, "netbios-name-servers"},
594 {45, __IP, "netbios-dd-server"},
595 {46, __8, "netbios-node-type"},
596 {47, __TXT, "netbios-scope"},
597 {48, __IP, "x-font-servers"},
598 {49, __IP, "x-display-managers"},
599 {50, __IP, "dhcp-requested-address"},
600 {51, __32, "dhcp-lease-time"},
601 {52, __8, "dhcp-option-overload"},
602 {53, __8, "dhcp-message-type"},
603 {54, __IP, "dhcp-server-identifier"},
604 {55, __8, "dhcp-parameter-request-list"},
605 {56, __TXT, "dhcp-message"},
606 {57, __16, "dhcp-max-message-size"},
607 {58, __32, "dhcp-renewal-time"},
608 {59, __32, "dhcp-rebinding-time"},
609 {60, __TXT, "vendor-class-identifier"},
610 {61, __TXT, "dhcp-client-identifier"},
611 {64, __TXT, "nisplus-domain"},
612 {65, __IP, "nisplus-servers"},
613 {66, __TXT, "tftp-server-name"},
614 {67, __TXT, "bootfile-name"},
615 {68, __IP, "mobile-ip-home-agent"},
616 {69, __IP, "smtp-server"},
617 {70, __IP, "pop-server"},
618 {71, __IP, "nntp-server"},
619 {72, __IP, "www-server"},
620 {73, __IP, "finger-server"},
621 {74, __IP, "irc-server"},
622 {75, __IP, "streettalk-server"},
623 {76, __IP, "streettalk-directory-assistance-server"},
624 {77, __TXT, "user-class"},
625 {85, __IP, "nds-servers"},
626 {86, __TXT, "nds-tree-name"},
627 {87, __TXT, "nds-context"},
628 {210, __TXT, "authenticate"},
629
630 /* use the following entries for arbitrary variables */
631 {246, __ILIST, ""},
632 {247, __ILIST, ""},
633 {248, __ILIST, ""},
634 {249, __ILIST, ""},
635 {250, __INDIR, ""},
636 {251, __INDIR, ""},
637 {252, __INDIR, ""},
638 {253, __INDIR, ""},
639 {254, __INDIR, ""},
640 {0, __TXT, "%soption-%d"}
641 };
642
643 /*
644 * parse a dhcp response, set environment variables translating options
645 * names and values according to the tables above. Also set dhcp.tags
646 * to the list of selected tags.
647 */
648 static void
649 setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts)
650 {
651 u_char *ncp;
652 u_char tag;
653 char tags[512], *tp; /* the list of tags */
654
655 #define FLD_SEP ',' /* separator in list of elements */
656 ncp = cp;
657 tp = tags;
658 if (opts == NULL)
659 opts = dhcp_opt;
660
661 while (ncp < ep) {
662 unsigned int size; /* option size */
663 char *vp, *endv, buf[256]; /* the value buffer */
664 struct dhcp_opt *op;
665
666 tag = *ncp++; /* extract tag and size */
667 size = *ncp++;
668 cp = ncp; /* current payload */
669 ncp += size; /* point to the next option */
670
671 if (tag == TAG_END)
672 break;
673 if (tag == 0)
674 continue;
675
676 for (op = opts+1; op->tag && op->tag != tag; op++)
677 ;
678 /* if not found we end up on the default entry */
679
680 /*
681 * Copy data into the buffer. libstand does not have snprintf so we
682 * need to be careful with sprintf(). With strings, the source is
683 * always <256 char so shorter than the buffer so we are safe; with
684 * other arguments, the longest string is inet_ntoa which is 16 bytes
685 * so we make sure to have always enough room in the string before
686 * trying an sprint.
687 */
688 vp = buf;
689 *vp = '\0';
690 endv = buf + sizeof(buf) - 1 - 16; /* last valid write position */
691
692 switch(op->fmt) {
693 case __NONE:
694 break; /* should not happen */
695
696 case __VE: /* recurse, vendor specific */
697 setenv_(cp, cp+size, vndr_opt);
698 break;
699
700 case __IP: /* ip address */
701 for (; size > 0 && vp < endv; size -= 4, cp += 4) {
702 struct in_addr in_ip; /* ip addresses */
703 if (vp != buf)
704 *vp++ = FLD_SEP;
705 bcopy(cp, &in_ip.s_addr, sizeof(in_ip.s_addr));
706 sprintf(vp, "%s", inet_ntoa(in_ip));
707 vp += strlen(vp);
708 }
709 break;
710
711 case __BYTES: /* opaque byte string */
712 for (; size > 0 && vp < endv; size -= 1, cp += 1) {
713 sprintf(vp, "%02x", *cp);
714 vp += strlen(vp);
715 }
716 break;
717
718 case __TXT:
719 bcopy(cp, buf, size); /* cannot overflow */
720 buf[size] = 0;
721 break;
722
723 case __32:
724 case __16:
725 case __8: /* op->fmt is also the length of each field */
726 for (; size > 0 && vp < endv; size -= op->fmt, cp += op->fmt) {
727 uint32_t v;
728 if (op->fmt == __32)
729 v = (cp[0]<<24) + (cp[1]<<16) + (cp[2]<<8) + cp[3];
730 else if (op->fmt == __16)
731 v = (cp[0]<<8) + cp[1];
732 else
733 v = cp[0];
734 if (vp != buf)
735 *vp++ = FLD_SEP;
736 sprintf(vp, "%u", v);
737 vp += strlen(vp);
738 }
739 break;
740
741 case __INDIR: /* name=value */
742 case __ILIST: /* name=value;name=value... */
743 bcopy(cp, buf, size); /* cannot overflow */
744 buf[size] = '\0';
745 for (endv = buf; endv; endv = vp) {
746 u_char *s = NULL; /* semicolon ? */
747
748 /* skip leading whitespace */
749 while (*endv && strchr(" \t\n\r", *endv))
750 endv++;
751 vp = strchr(endv, '='); /* find name=value separator */
752 if (!vp)
753 break;
754 *vp++ = 0;
755 if (op->fmt == __ILIST && (s = strchr(vp, ';')))
756 *s++ = '\0';
757 setenv(endv, vp, 1);
758 vp = s; /* prepare for next round */
759 }
760 buf[0] = '\0'; /* option already done */
761 }
762
763 if (tp - tags < sizeof(tags) - 5) { /* add tag to the list */
764 if (tp != tags)
765 *tp++ = FLD_SEP;
766 sprintf(tp, "%d", tag);
767 tp += strlen(tp);
768 }
769 if (buf[0]) {
770 char env[128]; /* the string name */
771
772 if (op->tag == 0)
773 sprintf(env, op->desc, opts[0].desc, tag);
774 else
775 sprintf(env, "%s%s", opts[0].desc, op->desc);
776 /*
777 * Do not replace existing values in the environment, so that
778 * locally-obtained values can override server-provided values.
779 */
780 setenv(env, buf, 0);
781 }
782 }
783 if (tp != tags) {
784 char env[128]; /* the string name */
785 sprintf(env, "%stags", opts[0].desc);
786 setenv(env, tags, 1);
787 }
788 }
789 #endif /* additional dhcp */
Unleashed OS