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