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8139 loader: efi multiboot2 update
[unleashed.git] / usr / src / boot / lib / libstand / bootp.c
blob117229753c6feb020af15876e413bd0b72cba4e2
1 /* $NetBSD: bootp.c,v 1.14 1998/02/16 11:10:54 drochner Exp $ */
2
3 /*
4 * Copyright (c) 1992 Regents of the University of California.
5 * All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#) Header: bootp.c,v 1.4 93/09/11 03:13:51 leres Exp (LBL)
36 */
37
38 #include <sys/cdefs.h>
39
40 #include <sys/types.h>
41 #include <sys/limits.h>
42 #include <sys/endian.h>
43 #include <netinet/in.h>
44 #include <netinet/in_systm.h>
45
46 #include <string.h>
47
48 #define BOOTP_DEBUGxx
49 #define SUPPORT_DHCP
50
51 #define DHCP_ENV_NOVENDOR 1 /* do not parse vendor options */
52 #define DHCP_ENV_PXE 10 /* assume pxe vendor options */
53 #define DHCP_ENV_FREEBSD 11 /* assume freebsd vendor options */
54 /* set DHCP_ENV to one of the values above to export dhcp options to kenv */
55 #define DHCP_ENV DHCP_ENV_NO_VENDOR
56
57 #include "stand.h"
58 #include "net.h"
59 #include "netif.h"
60 #include "bootp.h"
61
62
63 struct in_addr servip;
64
65 static time_t bot;
66
67 static char vm_rfc1048[4] = VM_RFC1048;
68 #ifdef BOOTP_VEND_CMU
69 static char vm_cmu[4] = VM_CMU;
70 #endif
71
72 /* Local forwards */
73 static ssize_t bootpsend(struct iodesc *, void *, size_t);
74 static ssize_t bootprecv(struct iodesc *, void *, size_t, time_t);
75 static int vend_rfc1048(u_char *, u_int);
76 #ifdef BOOTP_VEND_CMU
77 static void vend_cmu(u_char *);
78 #endif
79
80 #ifdef DHCP_ENV /* export the dhcp response to kenv */
81 struct dhcp_opt;
82 static void setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts);
83 #else
84 #define setenv_(a, b, c)
85 #endif
86
87 #ifdef SUPPORT_DHCP
88 static char expected_dhcpmsgtype = -1, dhcp_ok;
89 struct in_addr dhcp_serverip;
90 #endif
91 struct bootp *bootp_response;
92
93 /* Fetch required bootp infomation */
94 void
95 bootp(int sock, int flag)
96 {
97 struct iodesc *d;
98 struct bootp *bp;
99 struct {
100 u_char header[HEADER_SIZE];
101 struct bootp wbootp;
102 } wbuf;
103 struct {
104 u_char header[HEADER_SIZE];
105 struct bootp rbootp;
106 } rbuf;
107
108 #ifdef BOOTP_DEBUG
109 if (debug)
110 printf("bootp: socket=%d\n", sock);
111 #endif
112 if (!bot)
113 bot = getsecs();
114
115 if (!(d = socktodesc(sock))) {
116 printf("bootp: bad socket. %d\n", sock);
117 return;
118 }
119 #ifdef BOOTP_DEBUG
120 if (debug)
121 printf("bootp: d=%lx\n", (long)d);
122 #endif
123
124 bp = &wbuf.wbootp;
125 bzero(bp, sizeof(*bp));
126
127 bp->bp_op = BOOTREQUEST;
128 bp->bp_htype = 1; /* 10Mb Ethernet (48 bits) */
129 bp->bp_hlen = 6;
130 bp->bp_xid = htonl(d->xid);
131 MACPY(d->myea, bp->bp_chaddr);
132 strncpy(bp->bp_file, bootfile, sizeof(bp->bp_file));
133 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048));
134 #ifdef SUPPORT_DHCP
135 bp->bp_vend[4] = TAG_DHCP_MSGTYPE;
136 bp->bp_vend[5] = 1;
137 bp->bp_vend[6] = DHCPDISCOVER;
138
139 /*
140 * If we are booting from PXE, we want to send the string
141 * 'PXEClient' to the DHCP server so you have the option of
142 * only responding to PXE aware dhcp requests.
143 */
144 if (flag & BOOTP_PXE) {
145 bp->bp_vend[7] = TAG_CLASSID;
146 bp->bp_vend[8] = 9;
147 bcopy("PXEClient", &bp->bp_vend[9], 9);
148 bp->bp_vend[18] = TAG_PARAM_REQ;
149 bp->bp_vend[19] = 7;
150 bp->bp_vend[20] = TAG_ROOTPATH;
151 bp->bp_vend[21] = TAG_HOSTNAME;
152 bp->bp_vend[22] = TAG_SWAPSERVER;
153 bp->bp_vend[23] = TAG_GATEWAY;
154 bp->bp_vend[24] = TAG_SUBNET_MASK;
155 bp->bp_vend[25] = TAG_INTF_MTU;
156 bp->bp_vend[26] = TAG_SERVERID;
157 bp->bp_vend[27] = TAG_END;
158 } else
159 bp->bp_vend[7] = TAG_END;
160 #else
161 bp->bp_vend[4] = TAG_END;
162 #endif
163
164 d->myip.s_addr = INADDR_ANY;
165 d->myport = htons(IPPORT_BOOTPC);
166 d->destip.s_addr = INADDR_BROADCAST;
167 d->destport = htons(IPPORT_BOOTPS);
168
169 #ifdef SUPPORT_DHCP
170 expected_dhcpmsgtype = DHCPOFFER;
171 dhcp_ok = 0;
172 #endif
173
174 if(sendrecv(d,
175 bootpsend, bp, sizeof(*bp),
176 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
177 == -1) {
178 printf("bootp: no reply\n");
179 return;
180 }
181
182 #ifdef SUPPORT_DHCP
183 if(dhcp_ok) {
184 u_int32_t leasetime;
185 bp->bp_vend[6] = DHCPREQUEST;
186 bp->bp_vend[7] = TAG_REQ_ADDR;
187 bp->bp_vend[8] = 4;
188 bcopy(&rbuf.rbootp.bp_yiaddr, &bp->bp_vend[9], 4);
189 bp->bp_vend[13] = TAG_SERVERID;
190 bp->bp_vend[14] = 4;
191 bcopy(&dhcp_serverip.s_addr, &bp->bp_vend[15], 4);
192 bp->bp_vend[19] = TAG_LEASETIME;
193 bp->bp_vend[20] = 4;
194 leasetime = htonl(300);
195 bcopy(&leasetime, &bp->bp_vend[21], 4);
196 if (flag & BOOTP_PXE) {
197 bp->bp_vend[25] = TAG_CLASSID;
198 bp->bp_vend[26] = 9;
199 bcopy("PXEClient", &bp->bp_vend[27], 9);
200 bp->bp_vend[36] = TAG_END;
201 } else
202 bp->bp_vend[25] = TAG_END;
203
204 expected_dhcpmsgtype = DHCPACK;
205
206 if(sendrecv(d,
207 bootpsend, bp, sizeof(*bp),
208 bootprecv, &rbuf.rbootp, sizeof(rbuf.rbootp))
209 == -1) {
210 printf("DHCPREQUEST failed\n");
211 return;
212 }
213 }
214 #endif
215
216 myip = d->myip = rbuf.rbootp.bp_yiaddr;
217 servip = rbuf.rbootp.bp_siaddr;
218 if(rootip.s_addr == INADDR_ANY) rootip = servip;
219 bcopy(rbuf.rbootp.bp_file, bootfile, sizeof(bootfile));
220 bootfile[sizeof(bootfile) - 1] = '\0';
221
222 if (!netmask) {
223 if (IN_CLASSA(ntohl(myip.s_addr)))
224 netmask = htonl(IN_CLASSA_NET);
225 else if (IN_CLASSB(ntohl(myip.s_addr)))
226 netmask = htonl(IN_CLASSB_NET);
227 else
228 netmask = htonl(IN_CLASSC_NET);
229 #ifdef BOOTP_DEBUG
230 if (debug)
231 printf("'native netmask' is %s\n", intoa(netmask));
232 #endif
233 }
234
235 #ifdef BOOTP_DEBUG
236 if (debug)
237 printf("mask: %s\n", intoa(netmask));
238 #endif
239
240 /* We need a gateway if root is on a different net */
241 if (!SAMENET(myip, rootip, netmask)) {
242 #ifdef BOOTP_DEBUG
243 if (debug)
244 printf("need gateway for root ip\n");
245 #endif
246 }
247
248 /* Toss gateway if on a different net */
249 if (!SAMENET(myip, gateip, netmask)) {
250 #ifdef BOOTP_DEBUG
251 if (debug)
252 printf("gateway ip (%s) bad\n", inet_ntoa(gateip));
253 #endif
254 gateip.s_addr = 0;
255 }
256
257 /* Bump xid so next request will be unique. */
258 ++d->xid;
259 }
260
261 /* Transmit a bootp request */
262 static ssize_t
263 bootpsend(struct iodesc *d, void *pkt, size_t len)
264 {
265 struct bootp *bp;
266
267 #ifdef BOOTP_DEBUG
268 if (debug)
269 printf("bootpsend: d=%lx called.\n", (long)d);
270 #endif
271
272 bp = pkt;
273 bp->bp_secs = htons((u_short)(getsecs() - bot));
274
275 #ifdef BOOTP_DEBUG
276 if (debug)
277 printf("bootpsend: calling sendudp\n");
278 #endif
279
280 return (sendudp(d, pkt, len));
281 }
282
283 static ssize_t
284 bootprecv(struct iodesc *d, void *pkt, size_t len, time_t tleft)
285 {
286 ssize_t n;
287 struct bootp *bp;
288
289 #ifdef BOOTP_DEBUGx
290 if (debug)
291 printf("bootp_recvoffer: called\n");
292 #endif
293
294 n = readudp(d, pkt, len, tleft);
295 if (n == -1 || n < sizeof(struct bootp) - BOOTP_VENDSIZE)
296 goto bad;
297
298 bp = (struct bootp *)pkt;
299
300 #ifdef BOOTP_DEBUG
301 if (debug)
302 printf("bootprecv: checked. bp = 0x%lx, n = %d\n",
303 (long)bp, (int)n);
304 #endif
305 if (bp->bp_xid != htonl(d->xid)) {
306 #ifdef BOOTP_DEBUG
307 if (debug) {
308 printf("bootprecv: expected xid 0x%lx, got 0x%x\n",
309 d->xid, ntohl(bp->bp_xid));
310 }
311 #endif
312 goto bad;
313 }
314
315 #ifdef BOOTP_DEBUG
316 if (debug)
317 printf("bootprecv: got one!\n");
318 #endif
319
320 /* Suck out vendor info */
321 if (bcmp(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)) == 0) {
322 if(vend_rfc1048(bp->bp_vend, sizeof(bp->bp_vend)) != 0)
323 goto bad;
324
325 /* Save copy of bootp reply or DHCP ACK message */
326 if (bp->bp_op == BOOTREPLY &&
327 ((dhcp_ok == 1 && expected_dhcpmsgtype == DHCPACK) ||
328 dhcp_ok == 0)) {
329 free(bootp_response);
330 bootp_response = malloc(sizeof (*bootp_response));
331 if (bootp_response != NULL) {
332 bcopy(bp, bootp_response,
333 sizeof (*bootp_response));
334 }
335 }
336 }
337 #ifdef BOOTP_VEND_CMU
338 else if (bcmp(vm_cmu, bp->bp_vend, sizeof(vm_cmu)) == 0)
339 vend_cmu(bp->bp_vend);
340 #endif
341 else
342 printf("bootprecv: unknown vendor 0x%lx\n", (long)bp->bp_vend);
343
344 return(n);
345 bad:
346 errno = 0;
347 return (-1);
348 }
349
350 int
351 dhcp_try_rfc1048(uint8_t *cp, size_t len)
352 {
353
354 expected_dhcpmsgtype = DHCPACK;
355 if (bcmp(vm_rfc1048, cp, sizeof (vm_rfc1048)) == 0) {
356 return (vend_rfc1048(cp, len));
357 }
358 return (-1);
359 }
360
361 static int
362 vend_rfc1048(u_char *cp, u_int len)
363 {
364 u_char *ep;
365 int size;
366 u_char tag;
367 const char *val;
368
369 #ifdef BOOTP_DEBUG
370 if (debug)
371 printf("vend_rfc1048 bootp info. len=%d\n", len);
372 #endif
373 ep = cp + len;
374
375 /* Step over magic cookie */
376 cp += sizeof(int);
377
378 setenv_(cp, ep, NULL);
379
380 while (cp < ep) {
381 tag = *cp++;
382 size = *cp++;
383 if (tag == TAG_END)
384 break;
385
386 if (tag == TAG_SUBNET_MASK) {
387 bcopy(cp, &netmask, sizeof(netmask));
388 }
389 if (tag == TAG_GATEWAY) {
390 bcopy(cp, &gateip.s_addr, sizeof(gateip.s_addr));
391 }
392 if (tag == TAG_SWAPSERVER) {
393 /* let it override bp_siaddr */
394 bcopy(cp, &rootip.s_addr, sizeof(rootip.s_addr));
395 }
396 if (tag == TAG_ROOTPATH) {
397 if ((val = getenv("dhcp.root-path")) == NULL)
398 val = (const char *)cp;
399 strlcpy(rootpath, val, sizeof(rootpath));
400 }
401 if (tag == TAG_HOSTNAME) {
402 if ((val = getenv("dhcp.host-name")) == NULL)
403 val = (const char *)cp;
404 strlcpy(hostname, val, sizeof(hostname));
405 }
406 if (tag == TAG_INTF_MTU) {
407 intf_mtu = 0;
408 if ((val = getenv("dhcp.interface-mtu")) != NULL) {
409 unsigned long tmp;
410 char *end;
411
412 errno = 0;
413 /*
414 * Do not allow MTU to exceed max IPv4 packet
415 * size, max value of 16-bit word.
416 */
417 tmp = strtoul(val, &end, 0);
418 if (errno != 0 ||
419 *val == '\0' || *end != '\0' ||
420 tmp > USHRT_MAX) {
421 printf("%s: bad value: \"%s\", "
422 "ignoring\n",
423 "dhcp.interface-mtu", val);
424 } else {
425 intf_mtu = (u_int)tmp;
426 }
427 }
428 if (intf_mtu == 0)
429 intf_mtu = be16dec(cp);
430 }
431 #ifdef SUPPORT_DHCP
432 if (tag == TAG_DHCP_MSGTYPE) {
433 if(*cp != expected_dhcpmsgtype)
434 return(-1);
435 dhcp_ok = 1;
436 }
437 if (tag == TAG_SERVERID) {
438 bcopy(cp, &dhcp_serverip.s_addr,
439 sizeof(dhcp_serverip.s_addr));
440 }
441 #endif
442 cp += size;
443 }
444 return(0);
445 }
446
447 #ifdef BOOTP_VEND_CMU
448 static void
449 vend_cmu(u_char *cp)
450 {
451 struct cmu_vend *vp;
452
453 #ifdef BOOTP_DEBUG
454 if (debug)
455 printf("vend_cmu bootp info.\n");
456 #endif
457 vp = (struct cmu_vend *)cp;
458
459 if (vp->v_smask.s_addr != 0) {
460 netmask = vp->v_smask.s_addr;
461 }
462 if (vp->v_dgate.s_addr != 0) {
463 gateip = vp->v_dgate;
464 }
465 }
466 #endif
467
468 #ifdef DHCP_ENV
469 /*
470 * Parse DHCP options and store them into kenv variables.
471 * Original code from Danny Braniss, modifications by Luigi Rizzo.
472 *
473 * The parser is driven by tables which specify the type and name of
474 * each dhcp option and how it appears in kenv.
475 * The first entry in the list contains the prefix used to set the kenv
476 * name (including the . if needed), the last entry must have a 0 tag.
477 * Entries do not need to be sorted though it helps for readability.
478 *
479 * Certain vendor-specific tables can be enabled according to DHCP_ENV.
480 * Set it to 0 if you don't want any.
481 */
482 enum opt_fmt { __NONE = 0,
483 __8 = 1, __16 = 2, __32 = 4, /* Unsigned fields, value=size */
484 __IP, /* IPv4 address */
485 __TXT, /* C string */
486 __BYTES, /* byte sequence, printed %02x */
487 __INDIR, /* name=value */
488 __ILIST, /* name=value;name=value ... */
489 __VE, /* vendor specific, recurse */
490 };
491
492 struct dhcp_opt {
493 uint8_t tag;
494 uint8_t fmt;
495 const char *desc;
496 };
497
498 static struct dhcp_opt vndr_opt[] = { /* Vendor Specific Options */
499 #if DHCP_ENV == DHCP_ENV_FREEBSD /* FreeBSD table in the original code */
500 {0, 0, "FreeBSD"}, /* prefix */
501 {1, __TXT, "kernel"},
502 {2, __TXT, "kernelname"},
503 {3, __TXT, "kernel_options"},
504 {4, __IP, "usr-ip"},
505 {5, __TXT, "conf-path"},
506 {6, __TXT, "rc.conf0"},
507 {7, __TXT, "rc.conf1"},
508 {8, __TXT, "rc.conf2"},
509 {9, __TXT, "rc.conf3"},
510 {10, __TXT, "rc.conf4"},
511 {11, __TXT, "rc.conf5"},
512 {12, __TXT, "rc.conf6"},
513 {13, __TXT, "rc.conf7"},
514 {14, __TXT, "rc.conf8"},
515 {15, __TXT, "rc.conf9"},
516
517 {20, __TXT, "boot.nfsroot.options"},
518
519 {245, __INDIR, ""},
520 {246, __INDIR, ""},
521 {247, __INDIR, ""},
522 {248, __INDIR, ""},
523 {249, __INDIR, ""},
524 {250, __INDIR, ""},
525 {251, __INDIR, ""},
526 {252, __INDIR, ""},
527 {253, __INDIR, ""},
528 {254, __INDIR, ""},
529
530 #elif DHCP_ENV == DHCP_ENV_PXE /* some pxe options, RFC4578 */
531 {0, 0, "pxe"}, /* prefix */
532 {93, __16, "system-architecture"},
533 {94, __BYTES, "network-interface"},
534 {97, __BYTES, "machine-identifier"},
535 #else /* default (empty) table */
536 {0, 0, "dhcp.vendor."}, /* prefix */
537 #endif
538 {0, __TXT, "%soption-%d"}
539 };
540
541 static struct dhcp_opt dhcp_opt[] = {
542 /* DHCP Option names, formats and codes, from RFC2132. */
543 {0, 0, "dhcp."}, // prefix
544 {1, __IP, "subnet-mask"},
545 {2, __32, "time-offset"}, /* this is signed */
546 {3, __IP, "routers"},
547 {4, __IP, "time-servers"},
548 {5, __IP, "ien116-name-servers"},
549 {6, __IP, "domain-name-servers"},
550 {7, __IP, "log-servers"},
551 {8, __IP, "cookie-servers"},
552 {9, __IP, "lpr-servers"},
553 {10, __IP, "impress-servers"},
554 {11, __IP, "resource-location-servers"},
555 {12, __TXT, "host-name"},
556 {13, __16, "boot-size"},
557 {14, __TXT, "merit-dump"},
558 {15, __TXT, "domain-name"},
559 {16, __IP, "swap-server"},
560 {17, __TXT, "root-path"},
561 {18, __TXT, "extensions-path"},
562 {19, __8, "ip-forwarding"},
563 {20, __8, "non-local-source-routing"},
564 {21, __IP, "policy-filter"},
565 {22, __16, "max-dgram-reassembly"},
566 {23, __8, "default-ip-ttl"},
567 {24, __32, "path-mtu-aging-timeout"},
568 {25, __16, "path-mtu-plateau-table"},
569 {26, __16, "interface-mtu"},
570 {27, __8, "all-subnets-local"},
571 {28, __IP, "broadcast-address"},
572 {29, __8, "perform-mask-discovery"},
573 {30, __8, "mask-supplier"},
574 {31, __8, "perform-router-discovery"},
575 {32, __IP, "router-solicitation-address"},
576 {33, __IP, "static-routes"},
577 {34, __8, "trailer-encapsulation"},
578 {35, __32, "arp-cache-timeout"},
579 {36, __8, "ieee802-3-encapsulation"},
580 {37, __8, "default-tcp-ttl"},
581 {38, __32, "tcp-keepalive-interval"},
582 {39, __8, "tcp-keepalive-garbage"},
583 {40, __TXT, "nis-domain"},
584 {41, __IP, "nis-servers"},
585 {42, __IP, "ntp-servers"},
586 {43, __VE, "vendor-encapsulated-options"},
587 {44, __IP, "netbios-name-servers"},
588 {45, __IP, "netbios-dd-server"},
589 {46, __8, "netbios-node-type"},
590 {47, __TXT, "netbios-scope"},
591 {48, __IP, "x-font-servers"},
592 {49, __IP, "x-display-managers"},
593 {50, __IP, "dhcp-requested-address"},
594 {51, __32, "dhcp-lease-time"},
595 {52, __8, "dhcp-option-overload"},
596 {53, __8, "dhcp-message-type"},
597 {54, __IP, "dhcp-server-identifier"},
598 {55, __8, "dhcp-parameter-request-list"},
599 {56, __TXT, "dhcp-message"},
600 {57, __16, "dhcp-max-message-size"},
601 {58, __32, "dhcp-renewal-time"},
602 {59, __32, "dhcp-rebinding-time"},
603 {60, __TXT, "vendor-class-identifier"},
604 {61, __TXT, "dhcp-client-identifier"},
605 {64, __TXT, "nisplus-domain"},
606 {65, __IP, "nisplus-servers"},
607 {66, __TXT, "tftp-server-name"},
608 {67, __TXT, "bootfile-name"},
609 {68, __IP, "mobile-ip-home-agent"},
610 {69, __IP, "smtp-server"},
611 {70, __IP, "pop-server"},
612 {71, __IP, "nntp-server"},
613 {72, __IP, "www-server"},
614 {73, __IP, "finger-server"},
615 {74, __IP, "irc-server"},
616 {75, __IP, "streettalk-server"},
617 {76, __IP, "streettalk-directory-assistance-server"},
618 {77, __TXT, "user-class"},
619 {85, __IP, "nds-servers"},
620 {86, __TXT, "nds-tree-name"},
621 {87, __TXT, "nds-context"},
622 {210, __TXT, "authenticate"},
623
624 /* use the following entries for arbitrary variables */
625 {246, __ILIST, ""},
626 {247, __ILIST, ""},
627 {248, __ILIST, ""},
628 {249, __ILIST, ""},
629 {250, __INDIR, ""},
630 {251, __INDIR, ""},
631 {252, __INDIR, ""},
632 {253, __INDIR, ""},
633 {254, __INDIR, ""},
634 {0, __TXT, "%soption-%d"}
635 };
636
637 /*
638 * parse a dhcp response, set environment variables translating options
639 * names and values according to the tables above. Also set dhcp.tags
640 * to the list of selected tags.
641 */
642 static void
643 setenv_(u_char *cp, u_char *ep, struct dhcp_opt *opts)
644 {
645 u_char *ncp;
646 u_char tag;
647 char tags[512], *tp; /* the list of tags */
648
649 #define FLD_SEP ',' /* separator in list of elements */
650 ncp = cp;
651 tp = tags;
652 if (opts == NULL)
653 opts = dhcp_opt;
654
655 while (ncp < ep) {
656 unsigned int size; /* option size */
657 char *vp, *endv, buf[256]; /* the value buffer */
658 struct dhcp_opt *op;
659
660 tag = *ncp++; /* extract tag and size */
661 size = *ncp++;
662 cp = ncp; /* current payload */
663 ncp += size; /* point to the next option */
664
665 if (tag == TAG_END)
666 break;
667 if (tag == 0)
668 continue;
669
670 for (op = opts+1; op->tag && op->tag != tag; op++)
671 ;
672 /* if not found we end up on the default entry */
673
674 /*
675 * Copy data into the buffer. libstand does not have snprintf so we
676 * need to be careful with sprintf(). With strings, the source is
677 * always <256 char so shorter than the buffer so we are safe; with
678 * other arguments, the longest string is inet_ntoa which is 16 bytes
679 * so we make sure to have always enough room in the string before
680 * trying an sprint.
681 */
682 vp = buf;
683 *vp = '\0';
684 endv = buf + sizeof(buf) - 1 - 16; /* last valid write position */
685
686 switch(op->fmt) {
687 case __NONE:
688 break; /* should not happen */
689
690 case __VE: /* recurse, vendor specific */
691 setenv_(cp, cp+size, vndr_opt);
692 break;
693
694 case __IP: /* ip address */
695 for (; size > 0 && vp < endv; size -= 4, cp += 4) {
696 struct in_addr in_ip; /* ip addresses */
697 if (vp != buf)
698 *vp++ = FLD_SEP;
699 bcopy(cp, &in_ip.s_addr, sizeof(in_ip.s_addr));
700 sprintf(vp, "%s", inet_ntoa(in_ip));
701 vp += strlen(vp);
702 }
703 break;
704
705 case __BYTES: /* opaque byte string */
706 for (; size > 0 && vp < endv; size -= 1, cp += 1) {
707 sprintf(vp, "%02x", *cp);
708 vp += strlen(vp);
709 }
710 break;
711
712 case __TXT:
713 bcopy(cp, buf, size); /* cannot overflow */
714 buf[size] = 0;
715 break;
716
717 case __32:
718 case __16:
719 case __8: /* op->fmt is also the length of each field */
720 for (; size > 0 && vp < endv; size -= op->fmt, cp += op->fmt) {
721 uint32_t v;
722 if (op->fmt == __32)
723 v = (cp[0]<<24) + (cp[1]<<16) + (cp[2]<<8) + cp[3];
724 else if (op->fmt == __16)
725 v = (cp[0]<<8) + cp[1];
726 else
727 v = cp[0];
728 if (vp != buf)
729 *vp++ = FLD_SEP;
730 sprintf(vp, "%u", v);
731 vp += strlen(vp);
732 }
733 break;
734
735 case __INDIR: /* name=value */
736 case __ILIST: /* name=value;name=value... */
737 bcopy(cp, buf, size); /* cannot overflow */
738 buf[size] = '\0';
739 for (endv = buf; endv; endv = vp) {
740 u_char *s = NULL; /* semicolon ? */
741
742 /* skip leading whitespace */
743 while (*endv && strchr(" \t\n\r", *endv))
744 endv++;
745 vp = strchr(endv, '='); /* find name=value separator */
746 if (!vp)
747 break;
748 *vp++ = 0;
749 if (op->fmt == __ILIST && (s = strchr(vp, ';')))
750 *s++ = '\0';
751 setenv(endv, vp, 1);
752 vp = s; /* prepare for next round */
753 }
754 buf[0] = '\0'; /* option already done */
755 }
756
757 if (tp - tags < sizeof(tags) - 5) { /* add tag to the list */
758 if (tp != tags)
759 *tp++ = FLD_SEP;
760 sprintf(tp, "%d", tag);
761 tp += strlen(tp);
762 }
763 if (buf[0]) {
764 char env[128]; /* the string name */
765
766 if (op->tag == 0)
767 sprintf(env, op->desc, opts[0].desc, tag);
768 else
769 sprintf(env, "%s%s", opts[0].desc, op->desc);
770 /*
771 * Do not replace existing values in the environment, so that
772 * locally-obtained values can override server-provided values.
773 */
774 setenv(env, buf, 0);
775 }
776 }
777 if (tp != tags) {
778 char env[128]; /* the string name */
779 sprintf(env, "%stags", opts[0].desc);
780 setenv(env, tags, 1);
781 }
782 }
783 #endif /* additional dhcp */
Unleashed OS