sys/nfsclient/bootp_subr.c

   1 /*
   2  * Copyright (c) 1995 Gordon Ross, Adam Glass
   3  * Copyright (c) 1992 Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * This software was developed by the Computer Systems Engineering group
   7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   8  * contributed to Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Lawrence Berkeley Laboratory and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * based on:
  39  *      nfs/krpc_subr.c
  40  *      $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
  41  */
  42
  43 #include <sys/cdefs.h>
  44 __FBSDID("$FreeBSD$");
  45
  46 #include "opt_bootp.h"
  47
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50 #include <sys/kernel.h>
  51 #include <sys/sockio.h>
  52 #include <sys/malloc.h>
  53 #include <sys/mount.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/proc.h>
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/uio.h>
  60
  61 #include <net/if.h>
  62 #include <net/route.h>
  63
  64 #include <netinet/in.h>
  65 #include <net/if_types.h>
  66 #include <net/if_dl.h>
  67
  68 #include <nfs/rpcv2.h>
  69 #include <nfs/nfsproto.h>
  70 #include <nfsclient/nfs.h>
  71 #include <nfsclient/nfsdiskless.h>
  72 #include <nfsclient/krpc.h>
  73 #include <nfs/xdr_subs.h>
  74
  75
  76 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
  77
  78 #ifndef BOOTP_SETTLE_DELAY
  79 #define BOOTP_SETTLE_DELAY 3
  80 #endif
  81
  82 /*
  83  * What is the longest we will wait before re-sending a request?
  84  * Note this is also the frequency of "RPC timeout" messages.
  85  * The re-send loop count sup linearly to this maximum, so the
  86  * first complaint will happen after (1+2+3+4+5)=15 seconds.
  87  */
  88 #define MAX_RESEND_DELAY 5      /* seconds */
  89
  90 /* Definitions from RFC951 */
  91 struct bootp_packet {
  92         u_int8_t op;
  93         u_int8_t htype;
  94         u_int8_t hlen;
  95         u_int8_t hops;
  96         u_int32_t xid;
  97         u_int16_t secs;
  98         u_int16_t flags;
  99         struct in_addr ciaddr;
 100         struct in_addr yiaddr;
 101         struct in_addr siaddr;
 102         struct in_addr giaddr;
 103         unsigned char chaddr[16];
 104         char sname[64];
 105         char file[128];
 106         unsigned char vend[1222];
 107 };
 108
 109 struct bootpc_ifcontext {
 110         struct bootpc_ifcontext *next;
 111         struct bootp_packet call;
 112         struct bootp_packet reply;
 113         int replylen;
 114         int overload;
 115         struct socket *so;
 116         struct ifreq ireq;
 117         struct ifnet *ifp;
 118         struct sockaddr_dl *sdl;
 119         struct sockaddr_in myaddr;
 120         struct sockaddr_in netmask;
 121         struct sockaddr_in gw;
 122         struct sockaddr_in broadcast;   /* Different for each interface */
 123         int gotgw;
 124         int gotnetmask;
 125         int gotrootpath;
 126         int outstanding;
 127         int sentmsg;
 128         u_int32_t xid;
 129         enum {
 130                 IF_BOOTP_UNRESOLVED,
 131                 IF_BOOTP_RESOLVED,
 132                 IF_BOOTP_FAILED,
 133                 IF_DHCP_UNRESOLVED,
 134                 IF_DHCP_OFFERED,
 135                 IF_DHCP_RESOLVED,
 136                 IF_DHCP_FAILED,
 137         } state;
 138         int dhcpquerytype;              /* dhcp type sent */
 139         struct in_addr dhcpserver;
 140         int gotdhcpserver;
 141 };
 142
 143 #define TAG_MAXLEN 1024
 144 struct bootpc_tagcontext {
 145         char buf[TAG_MAXLEN + 1];
 146         int overload;
 147         int badopt;
 148         int badtag;
 149         int foundopt;
 150         int taglen;
 151 };
 152
 153 struct bootpc_globalcontext {
 154         struct bootpc_ifcontext *interfaces;
 155         struct bootpc_ifcontext *lastinterface;
 156         u_int32_t xid;
 157         int gotrootpath;
 158         int gotswappath;
 159         int gotgw;
 160         int ifnum;
 161         int secs;
 162         int starttime;
 163         struct bootp_packet reply;
 164         int replylen;
 165         struct bootpc_ifcontext *setswapfs;
 166         struct bootpc_ifcontext *setrootfs;
 167         struct bootpc_ifcontext *sethostname;
 168         char lookup_path[24];
 169         struct bootpc_tagcontext tmptag;
 170         struct bootpc_tagcontext tag;
 171 };
 172
 173 #define IPPORT_BOOTPC 68
 174 #define IPPORT_BOOTPS 67
 175
 176 #define BOOTP_REQUEST 1
 177 #define BOOTP_REPLY 2
 178
 179 /* Common tags */
 180 #define TAG_PAD           0  /* Pad option, implicit length 1 */
 181 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
 182 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
 183 #define TAG_HOSTNAME     12  /* Client host name */
 184 #define TAG_ROOT         17  /* Root path */
 185
 186 /* DHCP specific tags */
 187 #define TAG_OVERLOAD     52  /* Option Overload */
 188 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
 189
 190 #define TAG_END         255  /* End Option (i.e. no more options) */
 191
 192 /* Overload values */
 193 #define OVERLOAD_FILE     1
 194 #define OVERLOAD_SNAME    2
 195
 196 /* Site specific tags: */
 197 #define TAG_SWAP        128
 198 #define TAG_SWAPSIZE    129
 199 #define TAG_ROOTOPTS    130
 200 #define TAG_SWAPOPTS    131
 201 #define TAG_COOKIE      134     /* ascii info for userland, via sysctl */
 202
 203 #define TAG_DHCP_MSGTYPE 53
 204 #define TAG_DHCP_REQ_ADDR 50
 205 #define TAG_DHCP_SERVERID 54
 206 #define TAG_DHCP_LEASETIME 51
 207
 208 #define TAG_VENDOR_INDENTIFIER 60
 209
 210 #define DHCP_NOMSG    0
 211 #define DHCP_DISCOVER 1
 212 #define DHCP_OFFER    2
 213 #define DHCP_REQUEST  3
 214 #define DHCP_ACK      5
 215
 216 static char bootp_cookie[128];
 217 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
 218         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
 219
 220 /* mountd RPC */
 221 static int      md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
 222                     int *fhsizep, struct nfs_args *args, struct thread *td);
 223 static int      md_lookup_swap(struct sockaddr_in *mdsin, char *path,
 224                     u_char *fhp, int *fhsizep, struct nfs_args *args,
 225                     struct thread *td);
 226 static int      setfs(struct sockaddr_in *addr, char *path, char *p);
 227 static int      getdec(char **ptr);
 228 static char     *substr(char *a, char *b);
 229 static void     mountopts(struct nfs_args *args, char *p);
 230 static int      xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
 231 static int      xdr_int_decode(struct mbuf **ptr, int *iptr);
 232 static void     print_in_addr(struct in_addr addr);
 233 static void     print_sin_addr(struct sockaddr_in *addr);
 234 static void     clear_sinaddr(struct sockaddr_in *sin);
 235 static struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
 236 static void     bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 237                     struct bootpc_globalcontext *gctx, struct thread *td);
 238 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
 239                     struct bootp_packet *bp, int len, int tag);
 240 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 241                     unsigned char *start, int len, int tag);
 242
 243 #ifdef BOOTP_DEBUG
 244 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
 245 void bootpboot_p_ma(struct sockaddr *ma);
 246 void bootpboot_p_rtentry(struct rtentry *rt);
 247 void bootpboot_p_tree(struct radix_node *rn);
 248 void bootpboot_p_rtlist(void);
 249 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
 250 void bootpboot_p_iflist(void);
 251 #endif
 252
 253 static int      bootpc_call(struct bootpc_globalcontext *gctx,
 254                     struct thread *td);
 255
 256 static int      bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 257                     struct bootpc_globalcontext *gctx, struct thread *td);
 258
 259 static int      bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 260                     struct bootpc_globalcontext *gctx, struct thread *td);
 261
 262 static void     bootpc_decode_reply(struct nfsv3_diskless *nd,
 263                     struct bootpc_ifcontext *ifctx,
 264                     struct bootpc_globalcontext *gctx);
 265
 266 static int      bootpc_received(struct bootpc_globalcontext *gctx,
 267                     struct bootpc_ifcontext *ifctx);
 268
 269 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
 270 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
 271 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
 272
 273 /*
 274  * In order to have multiple active interfaces with address 0.0.0.0
 275  * and be able to send data to a selected interface, we perform
 276  * some tricks:
 277  *
 278  *  - The 'broadcast' address is different for each interface.
 279  *
 280  *  - We temporarily add routing pointing 255.255.255.255 to the
 281  *    selected interface broadcast address, thus the packet sent
 282  *    goes to that interface.
 283  */
 284
 285 #ifdef BOOTP_DEBUG
 286 void
 287 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
 288 {
 289
 290         if (sa == NULL) {
 291                 printf("(sockaddr *) <null>");
 292                 return;
 293         }
 294         switch (sa->sa_family) {
 295         case AF_INET:
 296         {
 297                 struct sockaddr_in *sin;
 298
 299                 sin = (struct sockaddr_in *) sa;
 300                 printf("inet ");
 301                 print_sin_addr(sin);
 302                 if (ma != NULL) {
 303                         sin = (struct sockaddr_in *) ma;
 304                         printf(" mask ");
 305                         print_sin_addr(sin);
 306                 }
 307         }
 308         break;
 309         case AF_LINK:
 310         {
 311                 struct sockaddr_dl *sli;
 312                 int i;
 313
 314                 sli = (struct sockaddr_dl *) sa;
 315                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
 316                 for (i = 0; i < sli->sdl_alen; i++) {
 317                         if (i > 0)
 318                                 printf(":");
 319                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
 320                 }
 321         }
 322         break;
 323         default:
 324                 printf("af%d", sa->sa_family);
 325         }
 326 }
 327
 328 void
 329 bootpboot_p_ma(struct sockaddr *ma)
 330 {
 331
 332         if (ma == NULL) {
 333                 printf("<null>");
 334                 return;
 335         }
 336         printf("%x", *(int *)ma);
 337 }
 338
 339 void
 340 bootpboot_p_rtentry(struct rtentry *rt)
 341 {
 342
 343         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
 344         printf(" ");
 345         bootpboot_p_ma(rt->rt_genmask);
 346         printf(" ");
 347         bootpboot_p_sa(rt->rt_gateway, NULL);
 348         printf(" ");
 349         printf("flags %x", (unsigned short) rt->rt_flags);
 350         printf(" %d", (int) rt->rt_rmx.rmx_expire);
 351         printf(" %s%d\n", rt->rt_ifp->if_name, rt->rt_ifp->if_unit);
 352 }
 353
 354 void
 355 bootpboot_p_tree(struct radix_node *rn)
 356 {
 357
 358         while (rn != NULL) {
 359                 if (rn->rn_bit < 0) {
 360                         if ((rn->rn_flags & RNF_ROOT) != 0) {
 361                         } else {
 362                                 bootpboot_p_rtentry((struct rtentry *) rn);
 363                         }
 364                         rn = rn->rn_dupedkey;
 365                 } else {
 366                         bootpboot_p_tree(rn->rn_left);
 367                         bootpboot_p_tree(rn->rn_right);
 368                         return;
 369                 }
 370         }
 371 }
 372
 373 void
 374 bootpboot_p_rtlist(void)
 375 {
 376
 377         printf("Routing table:\n");
 378         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
 379 }
 380
 381 void
 382 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
 383 {
 384
 385         printf("%s%d flags %x, addr ",
 386                ifp->if_name,
 387                ifp->if_unit,
 388                (unsigned short) ifp->if_flags);
 389         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
 390         printf(", broadcast ");
 391         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
 392         printf(", netmask ");
 393         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
 394         printf("\n");
 395 }
 396
 397 void
 398 bootpboot_p_iflist(void)
 399 {
 400         struct ifnet *ifp;
 401         struct ifaddr *ifa;
 402
 403         printf("Interface list:\n");
 404         for (ifp = TAILQ_FIRST(&ifnet);
 405              ifp != NULL;
 406              ifp = TAILQ_NEXT(ifp, if_link)) {
 407                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
 408                      ifa != NULL;
 409                      ifa = TAILQ_NEXT(ifa, ifa_link))
 410                         if (ifa->ifa_addr->sa_family == AF_INET)
 411                                 bootpboot_p_if(ifp, ifa);
 412         }
 413 }
 414 #endif /* defined(BOOTP_DEBUG) */
 415
 416 static void
 417 clear_sinaddr(struct sockaddr_in *sin)
 418 {
 419
 420         bzero(sin, sizeof(*sin));
 421         sin->sin_len = sizeof(*sin);
 422         sin->sin_family = AF_INET;
 423         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
 424         sin->sin_port = 0;
 425 }
 426
 427 static struct bootpc_ifcontext *
 428 allocifctx(struct bootpc_globalcontext *gctx)
 429 {
 430         struct bootpc_ifcontext *ifctx;
 431         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
 432                                                    M_TEMP, M_WAITOK);
 433         if (ifctx == NULL)
 434                 panic("Failed to allocate bootp interface context structure");
 435
 436         bzero(ifctx, sizeof(*ifctx));
 437         ifctx->xid = gctx->xid;
 438 #ifdef BOOTP_NO_DHCP
 439         ifctx->state = IF_BOOTP_UNRESOLVED;
 440 #else
 441         ifctx->state = IF_DHCP_UNRESOLVED;
 442 #endif
 443         gctx->xid += 0x100;
 444         return ifctx;
 445 }
 446
 447 static __inline int
 448 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
 449 {
 450
 451         if (ifctx->state == IF_BOOTP_RESOLVED ||
 452             ifctx->state == IF_DHCP_RESOLVED)
 453                 return 1;
 454         return 0;
 455 }
 456
 457 static __inline int
 458 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
 459 {
 460
 461         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
 462             ifctx->state == IF_DHCP_UNRESOLVED)
 463                 return 1;
 464         return 0;
 465 }
 466
 467 static __inline int
 468 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
 469 {
 470
 471         if (ifctx->state == IF_BOOTP_FAILED ||
 472             ifctx->state == IF_DHCP_FAILED)
 473                 return 1;
 474         return 0;
 475 }
 476
 477 static int
 478 bootpc_received(struct bootpc_globalcontext *gctx,
 479     struct bootpc_ifcontext *ifctx)
 480 {
 481         unsigned char dhcpreplytype;
 482         char *p;
 483
 484         /*
 485          * Need timeout for fallback to less
 486          * desirable alternative.
 487          */
 488
 489         /* This call used for the side effect (badopt flag) */
 490         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
 491                           gctx->replylen,
 492                           TAG_END);
 493
 494         /* If packet is invalid, ignore it */
 495         if (gctx->tmptag.badopt != 0)
 496                 return 0;
 497
 498         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
 499                        gctx->replylen, TAG_DHCP_MSGTYPE);
 500         if (p != NULL)
 501                 dhcpreplytype = *p;
 502         else
 503                 dhcpreplytype = DHCP_NOMSG;
 504
 505         switch (ifctx->dhcpquerytype) {
 506         case DHCP_DISCOVER:
 507                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
 508 #ifndef BOOTP_FORCE_DHCP
 509                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
 510 #endif
 511                         )
 512                         return 0;
 513                 break;
 514         case DHCP_REQUEST:
 515                 if (dhcpreplytype != DHCP_ACK)
 516                         return 0;
 517         case DHCP_NOMSG:
 518                 break;
 519         }
 520
 521         /* Ignore packet unless it gives us a root tag we didn't have */
 522
 523         if ((ifctx->state == IF_BOOTP_RESOLVED ||
 524              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 525               (ifctx->state == IF_DHCP_OFFERED ||
 526                ifctx->state == IF_DHCP_RESOLVED))) &&
 527             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 528                         ifctx->replylen,
 529                         TAG_ROOT) != NULL ||
 530              bootpc_tag(&gctx->tmptag, &gctx->reply,
 531                         gctx->replylen,
 532                         TAG_ROOT) == NULL))
 533                 return 0;
 534
 535         bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
 536         ifctx->replylen = gctx->replylen;
 537
 538         /* XXX: Only reset if 'perfect' response */
 539         if (ifctx->state == IF_BOOTP_UNRESOLVED)
 540                 ifctx->state = IF_BOOTP_RESOLVED;
 541         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
 542                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
 543                 if (dhcpreplytype == DHCP_OFFER)
 544                         ifctx->state = IF_DHCP_OFFERED;
 545                 else
 546                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
 547         } else if (ifctx->state == IF_DHCP_OFFERED &&
 548                    ifctx->dhcpquerytype == DHCP_REQUEST)
 549                 ifctx->state = IF_DHCP_RESOLVED;
 550
 551
 552         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 553             ifctx->state != IF_BOOTP_RESOLVED) {
 554                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
 555                                ifctx->replylen, TAG_DHCP_SERVERID);
 556                 if (p != NULL && gctx->tmptag.taglen == 4) {
 557                         memcpy(&ifctx->dhcpserver, p, 4);
 558                         ifctx->gotdhcpserver = 1;
 559                 } else
 560                         ifctx->gotdhcpserver = 0;
 561                 return 1;
 562         }
 563
 564         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 565                                          ifctx->replylen,
 566                                          TAG_ROOT) != NULL);
 567         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 568                                    ifctx->replylen,
 569                                    TAG_ROUTERS) != NULL);
 570         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 571                                         ifctx->replylen,
 572                                         TAG_SUBNETMASK) != NULL);
 573         return 1;
 574 }
 575
 576 static int
 577 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
 578 {
 579         struct socket *so;
 580         struct sockaddr_in *sin, dst;
 581         struct uio auio;
 582         struct sockopt sopt;
 583         struct iovec aio;
 584         int error, on, rcvflg, timo, len;
 585         time_t atimo;
 586         time_t rtimo;
 587         struct timeval tv;
 588         struct bootpc_ifcontext *ifctx;
 589         int outstanding;
 590         int gotrootpath;
 591         int retry;
 592         const char *s;
 593
 594         /*
 595          * Create socket and set its recieve timeout.
 596          */
 597         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td);
 598         if (error != 0)
 599                 goto out;
 600
 601         tv.tv_sec = 1;
 602         tv.tv_usec = 0;
 603         bzero(&sopt, sizeof(sopt));
 604         sopt.sopt_level = SOL_SOCKET;
 605         sopt.sopt_name = SO_RCVTIMEO;
 606         sopt.sopt_val = &tv;
 607         sopt.sopt_valsize = sizeof tv;
 608
 609         error = sosetopt(so, &sopt);
 610         if (error != 0)
 611                 goto out;
 612
 613         /*
 614          * Enable broadcast.
 615          */
 616         on = 1;
 617         sopt.sopt_name = SO_BROADCAST;
 618         sopt.sopt_val = &on;
 619         sopt.sopt_valsize = sizeof on;
 620
 621         error = sosetopt(so, &sopt);
 622         if (error != 0)
 623                 goto out;
 624
 625         /*
 626          * Disable routing.
 627          */
 628
 629         on = 1;
 630         sopt.sopt_name = SO_DONTROUTE;
 631         sopt.sopt_val = &on;
 632         sopt.sopt_valsize = sizeof on;
 633
 634         error = sosetopt(so, &sopt);
 635         if (error != 0)
 636                 goto out;
 637
 638         /*
 639          * Bind the local endpoint to a bootp client port.
 640          */
 641         sin = &dst;
 642         clear_sinaddr(sin);
 643         sin->sin_port = htons(IPPORT_BOOTPC);
 644         error = sobind(so, (struct sockaddr *)sin, td);
 645         if (error != 0) {
 646                 printf("bind failed\n");
 647                 goto out;
 648         }
 649
 650         /*
 651          * Setup socket address for the server.
 652          */
 653         sin = &dst;
 654         clear_sinaddr(sin);
 655         sin->sin_addr.s_addr = INADDR_BROADCAST;
 656         sin->sin_port = htons(IPPORT_BOOTPS);
 657
 658         /*
 659          * Send it, repeatedly, until a reply is received,
 660          * but delay each re-send by an increasing amount.
 661          * If the delay hits the maximum, start complaining.
 662          */
 663         timo = 0;
 664         rtimo = 0;
 665         for (;;) {
 666
 667                 outstanding = 0;
 668                 gotrootpath = 0;
 669
 670                 for (ifctx = gctx->interfaces;
 671                      ifctx != NULL;
 672                      ifctx = ifctx->next) {
 673                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 674                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 675                                        ifctx->replylen,
 676                                        TAG_ROOT) != NULL)
 677                                 gotrootpath = 1;
 678                 }
 679
 680                 for (ifctx = gctx->interfaces;
 681                      ifctx != NULL;
 682                      ifctx = ifctx->next) {
 683                         ifctx->outstanding = 0;
 684                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 685                             gotrootpath != 0) {
 686                                 continue;
 687                         }
 688                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 689                                 continue;
 690
 691                         outstanding++;
 692                         ifctx->outstanding = 1;
 693
 694                         /* Proceed to next step in DHCP negotiation */
 695                         if ((ifctx->state == IF_DHCP_OFFERED &&
 696                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 697                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 698                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 699                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 700                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 701                                 ifctx->sentmsg = 0;
 702                                 bootpc_compose_query(ifctx, gctx, td);
 703                         }
 704
 705                         /* Send BOOTP request (or re-send). */
 706
 707                         if (ifctx->sentmsg == 0) {
 708                                 switch(ifctx->dhcpquerytype) {
 709                                 case DHCP_DISCOVER:
 710                                         s = "DHCP Discover";
 711                                         break;
 712                                 case DHCP_REQUEST:
 713                                         s = "DHCP Request";
 714                                         break;
 715                                 case DHCP_NOMSG:
 716                                 default:
 717                                         s = "BOOTP Query";
 718                                         break;
 719                                 }
 720                                 printf("Sending %s packet from "
 721                                        "interface %s (%*D)\n",
 722                                        s,
 723                                        ifctx->ireq.ifr_name,
 724                                        ifctx->sdl->sdl_alen,
 725                                        (unsigned char *) LLADDR(ifctx->sdl),
 726                                        ":");
 727                                 ifctx->sentmsg = 1;
 728                         }
 729
 730                         aio.iov_base = (caddr_t) &ifctx->call;
 731                         aio.iov_len = sizeof(ifctx->call);
 732
 733                         auio.uio_iov = &aio;
 734                         auio.uio_iovcnt = 1;
 735                         auio.uio_segflg = UIO_SYSSPACE;
 736                         auio.uio_rw = UIO_WRITE;
 737                         auio.uio_offset = 0;
 738                         auio.uio_resid = sizeof(ifctx->call);
 739                         auio.uio_td = td;
 740
 741                         /* Set netmask to 0.0.0.0 */
 742
 743                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 744                         clear_sinaddr(sin);
 745                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 746                                         (caddr_t) &ifctx->ireq, td);
 747                         if (error != 0)
 748                                 panic("bootpc_call:"
 749                                       "set if netmask, error=%d",
 750                                       error);
 751
 752                         error = sosend(so, (struct sockaddr *) &dst,
 753                                        &auio, NULL, NULL, 0, td);
 754                         if (error != 0) {
 755                                 printf("bootpc_call: sosend: %d state %08x\n",
 756                                        error, (int) so->so_state);
 757                         }
 758
 759                         /* XXX: Is this needed ? */
 760                         tsleep(&error, PZERO + 8, "bootpw", 10);
 761
 762                         /* Set netmask to 255.0.0.0 */
 763
 764                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 765                         clear_sinaddr(sin);
 766                         sin->sin_addr.s_addr = htonl(0xff000000u);
 767                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 768                                         (caddr_t) &ifctx->ireq, td);
 769                         if (error != 0)
 770                                 panic("bootpc_call:"
 771                                       "set if netmask, error=%d",
 772                                       error);
 773
 774                 }
 775
 776                 if (outstanding == 0 &&
 777                     (rtimo == 0 || time_second >= rtimo)) {
 778                         error = 0;
 779                         goto gotreply;
 780                 }
 781
 782                 /* Determine new timeout. */
 783                 if (timo < MAX_RESEND_DELAY)
 784                         timo++;
 785                 else {
 786                         printf("DHCP/BOOTP timeout for server ");
 787                         print_sin_addr(&dst);
 788                         printf("\n");
 789                 }
 790
 791                 /*
 792                  * Wait for up to timo seconds for a reply.
 793                  * The socket receive timeout was set to 1 second.
 794                  */
 795                 atimo = timo + time_second;
 796                 while (time_second < atimo) {
 797                         aio.iov_base = (caddr_t) &gctx->reply;
 798                         aio.iov_len = sizeof(gctx->reply);
 799
 800                         auio.uio_iov = &aio;
 801                         auio.uio_iovcnt = 1;
 802                         auio.uio_segflg = UIO_SYSSPACE;
 803                         auio.uio_rw = UIO_READ;
 804                         auio.uio_offset = 0;
 805                         auio.uio_resid = sizeof(gctx->reply);
 806                         auio.uio_td = td;
 807
 808                         rcvflg = 0;
 809                         error = soreceive(so, NULL, &auio,
 810                                           NULL, NULL, &rcvflg);
 811                         gctx->secs = time_second - gctx->starttime;
 812                         for (ifctx = gctx->interfaces;
 813                              ifctx != NULL;
 814                              ifctx = ifctx->next) {
 815                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 816                                     bootpc_ifctx_isfailed(ifctx) != 0)
 817                                         continue;
 818
 819                                 ifctx->call.secs = htons(gctx->secs);
 820                         }
 821                         if (error == EWOULDBLOCK)
 822                                 continue;
 823                         if (error != 0)
 824                                 goto out;
 825                         len = sizeof(gctx->reply) - auio.uio_resid;
 826
 827                         /* Do we have the required number of bytes ? */
 828                         if (len < BOOTP_MIN_LEN)
 829                                 continue;
 830                         gctx->replylen = len;
 831
 832                         /* Is it a reply? */
 833                         if (gctx->reply.op != BOOTP_REPLY)
 834                                 continue;
 835
 836                         /* Is this an answer to our query */
 837                         for (ifctx = gctx->interfaces;
 838                              ifctx != NULL;
 839                              ifctx = ifctx->next) {
 840                                 if (gctx->reply.xid != ifctx->call.xid)
 841                                         continue;
 842
 843                                 /* Same HW address size ? */
 844                                 if (gctx->reply.hlen != ifctx->call.hlen)
 845                                         continue;
 846
 847                                 /* Correct HW address ? */
 848                                 if (bcmp(gctx->reply.chaddr,
 849                                          ifctx->call.chaddr,
 850                                          ifctx->call.hlen) != 0)
 851                                         continue;
 852
 853                                 break;
 854                         }
 855
 856                         if (ifctx != NULL) {
 857                                 s =  bootpc_tag(&gctx->tmptag,
 858                                                 &gctx->reply,
 859                                                 gctx->replylen,
 860                                                 TAG_DHCP_MSGTYPE);
 861                                 if (s != NULL) {
 862                                         switch (*s) {
 863                                         case DHCP_OFFER:
 864                                                 s = "DHCP Offer";
 865                                                 break;
 866                                         case DHCP_ACK:
 867                                                 s = "DHCP Ack";
 868                                                 break;
 869                                         default:
 870                                                 s = "DHCP (unexpected)";
 871                                                 break;
 872                                         }
 873                                 } else
 874                                         s = "BOOTP Reply";
 875
 876                                 printf("Received %s packet"
 877                                        " on %s from ",
 878                                        s,
 879                                        ifctx->ireq.ifr_name);
 880                                 print_in_addr(gctx->reply.siaddr);
 881                                 if (gctx->reply.giaddr.s_addr !=
 882                                     htonl(INADDR_ANY)) {
 883                                         printf(" via ");
 884                                         print_in_addr(gctx->reply.giaddr);
 885                                 }
 886                                 if (bootpc_received(gctx, ifctx) != 0) {
 887                                         printf(" (accepted)");
 888                                         if (ifctx->outstanding) {
 889                                                 ifctx->outstanding = 0;
 890                                                 outstanding--;
 891                                         }
 892                                         /* Network settle delay */
 893                                         if (outstanding == 0)
 894                                                 atimo = time_second +
 895                                                         BOOTP_SETTLE_DELAY;
 896                                 } else
 897                                         printf(" (ignored)");
 898                                 if (ifctx->gotrootpath) {
 899                                         gotrootpath = 1;
 900                                         rtimo = time_second +
 901                                                 BOOTP_SETTLE_DELAY;
 902                                         printf(" (got root path)");
 903                                 } else
 904                                         printf(" (no root path)");
 905                                 printf("\n");
 906                         }
 907                 } /* while secs */
 908 #ifdef BOOTP_TIMEOUT
 909                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 910                         break;
 911 #endif
 912                 /* Force a retry if halfway in DHCP negotiation */
 913                 retry = 0;
 914                 for (ifctx = gctx->interfaces; ifctx != NULL;
 915                      ifctx = ifctx->next) {
 916                         if (ifctx->state == IF_DHCP_OFFERED) {
 917                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 918                                         retry = 1;
 919                                 else
 920                                         ifctx->state = IF_DHCP_UNRESOLVED;
 921                         }
 922                 }
 923
 924                 if (retry != 0)
 925                         continue;
 926
 927                 if (gotrootpath != 0) {
 928                         gctx->gotrootpath = gotrootpath;
 929                         if (rtimo != 0 && time_second >= rtimo)
 930                                 break;
 931                 }
 932         } /* forever send/receive */
 933
 934         /*
 935          * XXX: These are errors of varying seriousness being silently
 936          * ignored
 937          */
 938
 939         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 940                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 941                         printf("%s timeout for interface %s\n",
 942                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 943                                "DHCP" : "BOOTP",
 944                                ifctx->ireq.ifr_name);
 945                 }
 946         }
 947         if (gctx->gotrootpath != 0) {
 948 #if 0
 949                 printf("Got a root path, ignoring remaining timeout\n");
 950 #endif
 951                 error = 0;
 952                 goto out;
 953         }
 954 #ifndef BOOTP_NFSROOT
 955         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 956                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 957                         error = 0;
 958                         goto out;
 959                 }
 960         }
 961 #endif
 962         error = ETIMEDOUT;
 963         goto out;
 964
 965 gotreply:
 966 out:
 967         soclose(so);
 968         return error;
 969 }
 970
 971 static int
 972 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 973     struct bootpc_globalcontext *gctx, struct thread *td)
 974 {
 975         struct sockaddr_in *sin;
 976         int error;
 977         struct ifreq *ireq;
 978         struct socket *so;
 979         struct ifaddr *ifa;
 980         struct sockaddr_dl *sdl;
 981
 982         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
 983         if (error != 0)
 984                 panic("nfs_boot: socreate, error=%d", error);
 985
 986         ireq = &ifctx->ireq;
 987         so = ifctx->so;
 988
 989         /*
 990          * Bring up the interface.
 991          *
 992          * Get the old interface flags and or IFF_UP into them; if
 993          * IFF_UP set blindly, interface selection can be clobbered.
 994          */
 995         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 996         if (error != 0)
 997                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 998         ireq->ifr_flags |= IFF_UP;
 999         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1000         if (error != 0)
1001                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1002
1003         /*
1004          * Do enough of ifconfig(8) so that the chosen interface
1005          * can talk to the servers.  (just set the address)
1006          */
1007
1008         /* addr is 0.0.0.0 */
1009
1010         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1011         clear_sinaddr(sin);
1012         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1013         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1014                 panic("bootpc_fakeup_interface: "
1015                       "set if addr, error=%d", error);
1016
1017         /* netmask is 255.0.0.0 */
1018
1019         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1020         clear_sinaddr(sin);
1021         sin->sin_addr.s_addr = htonl(0xff000000u);
1022         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
1023         if (error != 0)
1024                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1025                       error);
1026
1027         /* Broadcast is 255.255.255.255 */
1028
1029         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1030         clear_sinaddr(sin);
1031         clear_sinaddr(&ifctx->broadcast);
1032         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1033         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1034
1035         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
1036         if (error != 0)
1037                 panic("bootpc_fakeup_interface: "
1038                       "set if broadcast addr, error=%d",
1039                       error);
1040
1041         /* Get HW address */
1042
1043         sdl = NULL;
1044         for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
1045              ifa != NULL;
1046              ifa = TAILQ_NEXT(ifa, ifa_link))
1047                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1048                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1049                     sdl->sdl_type == IFT_ETHER)
1050                         break;
1051
1052         if (sdl == NULL)
1053                 panic("bootpc: Unable to find HW address for %s",
1054                       ifctx->ireq.ifr_name);
1055         ifctx->sdl = sdl;
1056
1057         return error;
1058 }
1059
1060
1061 static int
1062 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1063     struct bootpc_globalcontext *gctx, struct thread *td)
1064 {
1065         int error;
1066         struct sockaddr_in defdst;
1067         struct sockaddr_in defmask;
1068         struct sockaddr_in *sin;
1069         struct ifreq *ireq;
1070         struct socket *so;
1071         struct sockaddr_in *myaddr;
1072         struct sockaddr_in *netmask;
1073         struct sockaddr_in *gw;
1074
1075         ireq = &ifctx->ireq;
1076         so = ifctx->so;
1077         myaddr = &ifctx->myaddr;
1078         netmask = &ifctx->netmask;
1079         gw = &ifctx->gw;
1080
1081         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1082
1083                 /* Shutdown interfaces where BOOTP failed */
1084
1085                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1086                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1087                 if (error != 0)
1088                         panic("bootpc_adjust_interface: "
1089                               "SIOCGIFFLAGS, error=%d", error);
1090                 ireq->ifr_flags &= ~IFF_UP;
1091                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1092                 if (error != 0)
1093                         panic("bootpc_adjust_interface: "
1094                               "SIOCSIFFLAGS, error=%d", error);
1095
1096                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1097                 clear_sinaddr(sin);
1098                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
1099                 if (error != 0 && (error != EEXIST ||
1100                                    ifctx == gctx->interfaces))
1101                         panic("bootpc_adjust_interface: "
1102                               "SIOCDIFADDR, error=%d", error);
1103
1104                 return 0;
1105         }
1106
1107         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1108         /*
1109          * Do enough of ifconfig(8) so that the chosen interface
1110          * can talk to the servers.  (just set the address)
1111          */
1112         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1113         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
1114         if (error != 0)
1115                 panic("bootpc_adjust_interface: "
1116                       "set if netmask, error=%d", error);
1117
1118         /* Broadcast is with host part of IP address all 1's */
1119
1120         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1121         clear_sinaddr(sin);
1122         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1123                 ~ netmask->sin_addr.s_addr;
1124         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
1125         if (error != 0)
1126                 panic("bootpc_adjust_interface: "
1127                       "set if broadcast addr, error=%d", error);
1128
1129         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1130         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1131         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1132                 panic("bootpc_adjust_interface: "
1133                       "set if addr, error=%d", error);
1134
1135         /* Add new default route */
1136
1137         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1138                 clear_sinaddr(&defdst);
1139                 clear_sinaddr(&defmask);
1140                 error = rtrequest(RTM_ADD,
1141                                   (struct sockaddr *) &defdst,
1142                                   (struct sockaddr *) gw,
1143                                   (struct sockaddr *) &defmask,
1144                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
1145                 if (error != 0) {
1146                         printf("bootpc_adjust_interface: "
1147                                "add net route, error=%d\n", error);
1148                         return error;
1149                 }
1150         }
1151
1152         return 0;
1153 }
1154
1155 static int
1156 setfs(struct sockaddr_in *addr, char *path, char *p)
1157 {
1158         unsigned int ip;
1159         int val;
1160
1161         ip = 0;
1162         if (((val = getdec(&p)) < 0) || (val > 255))
1163                 return 0;
1164         ip = val << 24;
1165         if (*p != '.')
1166                 return 0;
1167         p++;
1168         if (((val = getdec(&p)) < 0) || (val > 255))
1169                 return 0;
1170         ip |= (val << 16);
1171         if (*p != '.')
1172                 return 0;
1173         p++;
1174         if (((val = getdec(&p)) < 0) || (val > 255))
1175                 return 0;
1176         ip |= (val << 8);
1177         if (*p != '.')
1178                 return 0;
1179         p++;
1180         if (((val = getdec(&p)) < 0) || (val > 255))
1181                 return 0;
1182         ip |= val;
1183         if (*p != ':')
1184                 return 0;
1185         p++;
1186
1187         addr->sin_addr.s_addr = htonl(ip);
1188         addr->sin_len = sizeof(struct sockaddr_in);
1189         addr->sin_family = AF_INET;
1190
1191         strncpy(path, p, MNAMELEN - 1);
1192         return 1;
1193 }
1194
1195 static int
1196 getdec(char **ptr)
1197 {
1198         char *p;
1199         int ret;
1200
1201         p = *ptr;
1202         ret = 0;
1203         if ((*p < '0') || (*p > '9'))
1204                 return -1;
1205         while ((*p >= '0') && (*p <= '9')) {
1206                 ret = ret * 10 + (*p - '0');
1207                 p++;
1208         }
1209         *ptr = p;
1210         return ret;
1211 }
1212
1213 static char *
1214 substr(char *a, char *b)
1215 {
1216         char *loc1;
1217         char *loc2;
1218
1219         while (*a != '\0') {
1220                 loc1 = a;
1221                 loc2 = b;
1222                 while (*loc1 == *loc2++) {
1223                         if (*loc1 == '\0')
1224                                 return 0;
1225                         loc1++;
1226                         if (*loc2 == '\0')
1227                                 return loc1;
1228                 }
1229                 a++;
1230         }
1231         return 0;
1232 }
1233
1234 static void
1235 mountopts(struct nfs_args *args, char *p)
1236 {
1237         char *tmp;
1238
1239         args->version = NFS_ARGSVERSION;
1240         args->rsize = 8192;
1241         args->wsize = 8192;
1242         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1243         args->sotype = SOCK_DGRAM;
1244         if (p == NULL)
1245                 return;
1246         if ((tmp = (char *)substr(p, "rsize=")))
1247                 args->rsize = getdec(&tmp);
1248         if ((tmp = (char *)substr(p, "wsize=")))
1249                 args->wsize = getdec(&tmp);
1250         if ((tmp = (char *)substr(p, "intr")))
1251                 args->flags |= NFSMNT_INT;
1252         if ((tmp = (char *)substr(p, "soft")))
1253                 args->flags |= NFSMNT_SOFT;
1254         if ((tmp = (char *)substr(p, "noconn")))
1255                 args->flags |= NFSMNT_NOCONN;
1256         if ((tmp = (char *)substr(p, "tcp")))
1257                 args->sotype = SOCK_STREAM;
1258 }
1259
1260 static int
1261 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1262 {
1263         struct mbuf *m;
1264         int alignedlen;
1265
1266         m = *mptr;
1267         alignedlen = ( len + 3 ) & ~3;
1268
1269         if (m->m_len < alignedlen) {
1270                 m = m_pullup(m, alignedlen);
1271                 if (m == NULL) {
1272                         *mptr = NULL;
1273                         return EBADRPC;
1274                 }
1275         }
1276         bcopy(mtod(m, u_char *), buf, len);
1277         m_adj(m, alignedlen);
1278         *mptr = m;
1279         return 0;
1280 }
1281
1282 static int
1283 xdr_int_decode(struct mbuf **mptr, int *iptr)
1284 {
1285         u_int32_t i;
1286
1287         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1288                 return EBADRPC;
1289         *iptr = fxdr_unsigned(u_int32_t, i);
1290         return 0;
1291 }
1292
1293 static void
1294 print_sin_addr(struct sockaddr_in *sin)
1295 {
1296
1297         print_in_addr(sin->sin_addr);
1298 }
1299
1300 static void
1301 print_in_addr(struct in_addr addr)
1302 {
1303         unsigned int ip;
1304
1305         ip = ntohl(addr.s_addr);
1306         printf("%d.%d.%d.%d",
1307                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1308 }
1309
1310 static void
1311 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1312     struct bootpc_globalcontext *gctx, struct thread *td)
1313 {
1314         unsigned char *vendp;
1315         unsigned char vendor_client[64];
1316         uint32_t leasetime;
1317         uint8_t vendor_client_len;
1318
1319         ifctx->gotrootpath = 0;
1320
1321         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1322
1323         /* bootpc part */
1324         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1325         ifctx->call.htype = 1;                  /* 10mb ethernet */
1326         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1327         ifctx->call.hops = 0;
1328         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1329                 ifctx->xid++;
1330         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1331         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1332
1333         vendp = ifctx->call.vend;
1334         *vendp++ = 99;          /* RFC1048 cookie */
1335         *vendp++ = 130;
1336         *vendp++ = 83;
1337         *vendp++ = 99;
1338         *vendp++ = TAG_MAXMSGSIZE;
1339         *vendp++ = 2;
1340         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1341         *vendp++ = sizeof(struct bootp_packet) & 255;
1342
1343         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1344                 ostype, MACHINE, osrelease);
1345         vendor_client_len = strlen(vendor_client);
1346         *vendp++ = TAG_VENDOR_INDENTIFIER;
1347         *vendp++ = vendor_client_len;
1348         memcpy(vendp, vendor_client, vendor_client_len);
1349         vendp += vendor_client_len;;
1350         ifctx->dhcpquerytype = DHCP_NOMSG;
1351         switch (ifctx->state) {
1352         case IF_DHCP_UNRESOLVED:
1353                 *vendp++ = TAG_DHCP_MSGTYPE;
1354                 *vendp++ = 1;
1355                 *vendp++ = DHCP_DISCOVER;
1356                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1357                 ifctx->gotdhcpserver = 0;
1358                 break;
1359         case IF_DHCP_OFFERED:
1360                 *vendp++ = TAG_DHCP_MSGTYPE;
1361                 *vendp++ = 1;
1362                 *vendp++ = DHCP_REQUEST;
1363                 ifctx->dhcpquerytype = DHCP_REQUEST;
1364                 *vendp++ = TAG_DHCP_REQ_ADDR;
1365                 *vendp++ = 4;
1366                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1367                 vendp += 4;
1368                 if (ifctx->gotdhcpserver != 0) {
1369                         *vendp++ = TAG_DHCP_SERVERID;
1370                         *vendp++ = 4;
1371                         memcpy(vendp, &ifctx->dhcpserver, 4);
1372                         vendp += 4;
1373                 }
1374                 *vendp++ = TAG_DHCP_LEASETIME;
1375                 *vendp++ = 4;
1376                 leasetime = htonl(300);
1377                 memcpy(vendp, &leasetime, 4);
1378                 vendp += 4;
1379         default:
1380                 ;
1381         }
1382         *vendp = TAG_END;
1383
1384         ifctx->call.secs = 0;
1385         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1386 }
1387
1388 static int
1389 bootpc_hascookie(struct bootp_packet *bp)
1390 {
1391
1392         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1393                 bp->vend[2] == 83 && bp->vend[3] == 99);
1394 }
1395
1396 static void
1397 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1398     unsigned char *start, int len, int tag)
1399 {
1400         unsigned char *j;
1401         unsigned char *ej;
1402         unsigned char code;
1403
1404         if (tctx->badtag != 0 || tctx->badopt != 0)
1405                 return;
1406
1407         j = start;
1408         ej = j + len;
1409
1410         while (j < ej) {
1411                 code = *j++;
1412                 if (code == TAG_PAD)
1413                         continue;
1414                 if (code == TAG_END)
1415                         return;
1416                 if (j >= ej || j + *j + 1 > ej) {
1417                         tctx->badopt = 1;
1418                         return;
1419                 }
1420                 len = *j++;
1421                 if (code == tag) {
1422                         if (tctx->taglen + len > TAG_MAXLEN) {
1423                                 tctx->badtag = 1;
1424                                 return;
1425                         }
1426                         tctx->foundopt = 1;
1427                         if (len > 0)
1428                                 memcpy(tctx->buf + tctx->taglen,
1429                                        j, len);
1430                         tctx->taglen += len;
1431                 }
1432                 if (code == TAG_OVERLOAD)
1433                         tctx->overload = *j;
1434
1435                 j += len;
1436         }
1437 }
1438
1439 static unsigned char *
1440 bootpc_tag(struct bootpc_tagcontext *tctx,
1441     struct bootp_packet *bp, int len, int tag)
1442 {
1443         unsigned char *j;
1444         unsigned char *ej;
1445
1446         tctx->overload = 0;
1447         tctx->badopt = 0;
1448         tctx->badtag = 0;
1449         tctx->foundopt = 0;
1450         tctx->taglen = 0;
1451
1452         if (bootpc_hascookie(bp) == 0)
1453                 return NULL;
1454
1455         j = &bp->vend[4];
1456         ej = (unsigned char *) bp + len;
1457
1458         bootpc_tag_helper(tctx, &bp->vend[4],
1459                           (unsigned char *) bp + len - &bp->vend[4], tag);
1460
1461         if ((tctx->overload & OVERLOAD_FILE) != 0)
1462                 bootpc_tag_helper(tctx,
1463                                   (unsigned char *) bp->file,
1464                                   sizeof(bp->file),
1465                                   tag);
1466         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1467                 bootpc_tag_helper(tctx,
1468                                   (unsigned char *) bp->sname,
1469                                   sizeof(bp->sname),
1470                                   tag);
1471
1472         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1473                 return NULL;
1474         tctx->buf[tctx->taglen] = '\0';
1475         return tctx->buf;
1476 }
1477
1478 static void
1479 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1480     struct bootpc_globalcontext *gctx)
1481 {
1482         char *p;
1483         unsigned int ip;
1484
1485         ifctx->gotgw = 0;
1486         ifctx->gotnetmask = 0;
1487
1488         clear_sinaddr(&ifctx->myaddr);
1489         clear_sinaddr(&ifctx->netmask);
1490         clear_sinaddr(&ifctx->gw);
1491
1492         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1493
1494         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1495         snprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1496                  "swap.%d.%d.%d.%d",
1497                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1498
1499         printf("%s at ", ifctx->ireq.ifr_name);
1500         print_sin_addr(&ifctx->myaddr);
1501         printf(" server ");
1502         print_in_addr(ifctx->reply.siaddr);
1503
1504         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1505         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1506                 printf(" via gateway ");
1507                 print_in_addr(ifctx->reply.giaddr);
1508         }
1509
1510         /* This call used for the side effect (overload flag) */
1511         (void) bootpc_tag(&gctx->tmptag,
1512                           &ifctx->reply, ifctx->replylen, TAG_END);
1513
1514         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1515                 if (ifctx->reply.sname[0] != '\0')
1516                         printf(" server name %s", ifctx->reply.sname);
1517         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1518                 if (ifctx->reply.file[0] != '\0')
1519                         printf(" boot file %s", ifctx->reply.file);
1520
1521         printf("\n");
1522
1523         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1524                        TAG_SUBNETMASK);
1525         if (p != NULL) {
1526                 if (gctx->tag.taglen != 4)
1527                         panic("bootpc: subnet mask len is %d",
1528                               gctx->tag.taglen);
1529                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1530                 ifctx->gotnetmask = 1;
1531                 printf("subnet mask ");
1532                 print_sin_addr(&ifctx->netmask);
1533                 printf(" ");
1534         }
1535
1536         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1537                        TAG_ROUTERS);
1538         if (p != NULL) {
1539                 /* Routers */
1540                 if (gctx->tag.taglen % 4)
1541                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1542                 if (gctx->tag.taglen > 0) {
1543                         bcopy(p, &ifctx->gw.sin_addr, 4);
1544                         printf("router ");
1545                         print_sin_addr(&ifctx->gw);
1546                         printf(" ");
1547                         ifctx->gotgw = 1;
1548                         gctx->gotgw = 1;
1549                 }
1550         }
1551
1552         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1553                        TAG_ROOT);
1554         if (p != NULL) {
1555                 if (gctx->setrootfs != NULL) {
1556                         printf("rootfs %s (ignored) ", p);
1557                 } else  if (setfs(&nd->root_saddr,
1558                                   nd->root_hostnam, p)) {
1559                         printf("rootfs %s ", p);
1560                         gctx->gotrootpath = 1;
1561                         ifctx->gotrootpath = 1;
1562                         gctx->setrootfs = ifctx;
1563
1564                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1565                                        ifctx->replylen,
1566                                        TAG_ROOTOPTS);
1567                         if (p != NULL) {
1568                                 mountopts(&nd->root_args, p);
1569                                 printf("rootopts %s ", p);
1570                         }
1571                 } else
1572                         panic("Failed to set rootfs to %s", p);
1573         }
1574
1575         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1576                        TAG_SWAP);
1577         if (p != NULL) {
1578                 if (gctx->setswapfs != NULL) {
1579                         printf("swapfs %s (ignored) ", p);
1580                 } else  if (setfs(&nd->swap_saddr,
1581                                   nd->swap_hostnam, p)) {
1582                         gctx->gotswappath = 1;
1583                         gctx->setswapfs = ifctx;
1584                         printf("swapfs %s ", p);
1585
1586                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1587                                        ifctx->replylen,
1588                                        TAG_SWAPOPTS);
1589                         if (p != NULL) {
1590                                 /* swap mount options */
1591                                 mountopts(&nd->swap_args, p);
1592                                 printf("swapopts %s ", p);
1593                         }
1594
1595                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1596                                        ifctx->replylen,
1597                                        TAG_SWAPSIZE);
1598                         if (p != NULL) {
1599                                 int swaplen;
1600                                 if (gctx->tag.taglen != 4)
1601                                         panic("bootpc: "
1602                                               "Expected 4 bytes for swaplen, "
1603                                               "not %d bytes",
1604                                               gctx->tag.taglen);
1605                                 bcopy(p, &swaplen, 4);
1606                                 nd->swap_nblks = ntohl(swaplen);
1607                                 printf("swapsize %d KB ",
1608                                        nd->swap_nblks);
1609                         }
1610                 } else
1611                         panic("Failed to set swapfs to %s", p);
1612         }
1613
1614         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1615                        TAG_HOSTNAME);
1616         if (p != NULL) {
1617                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1618                         panic("bootpc: hostname >= %d bytes",
1619                               MAXHOSTNAMELEN);
1620                 if (gctx->sethostname != NULL) {
1621                         printf("hostname %s (ignored) ", p);
1622                 } else {
1623                         strcpy(nd->my_hostnam, p);
1624                         strcpy(hostname, p);
1625                         printf("hostname %s ", hostname);
1626                         gctx->sethostname = ifctx;
1627                 }
1628         }
1629         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1630                         TAG_COOKIE);
1631         if (p != NULL) {        /* store in a sysctl variable */
1632                 int i, l = sizeof(bootp_cookie) - 1;
1633                 for (i = 0; i < l && p[i] != '\0'; i++)
1634                         bootp_cookie[i] = p[i];
1635                 p[i] = '\0';
1636         }
1637
1638
1639         printf("\n");
1640
1641         if (ifctx->gotnetmask == 0) {
1642                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1643                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1644                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1645                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1646                 else
1647                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1648         }
1649         if (ifctx->gotgw == 0) {
1650                 /* Use proxyarp */
1651                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1652         }
1653 }
1654
1655 void
1656 bootpc_init(void)
1657 {
1658         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1659         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1660         struct ifnet *ifp;
1661         int error;
1662         struct nfsv3_diskless *nd;
1663         struct thread *td;
1664
1665         nd = &nfsv3_diskless;
1666         td = curthread;
1667
1668         /*
1669          * If already filled in, don't touch it here
1670          */
1671         if (nfs_diskless_valid != 0)
1672                 return;
1673
1674         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK);
1675         if (gctx == NULL)
1676                 panic("Failed to allocate bootp global context structure");
1677
1678         bzero(gctx, sizeof(*gctx));
1679         gctx->xid = ~0xFFFF;
1680         gctx->starttime = time_second;
1681
1682         ifctx = allocifctx(gctx);
1683
1684         /*
1685          * Find a network interface.
1686          */
1687 #ifdef BOOTP_WIRED_TO
1688         printf("bootpc_init: wired to interface '%s'\n",
1689                __XSTRING(BOOTP_WIRED_TO));
1690 #endif
1691         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1692         for (ifp = TAILQ_FIRST(&ifnet);
1693              ifp != NULL;
1694              ifp = TAILQ_NEXT(ifp, if_link)) {
1695                 snprintf(ifctx->ireq.ifr_name, sizeof(ifctx->ireq.ifr_name),
1696                          "%s%d", ifp->if_name, ifp->if_unit);
1697 #ifdef BOOTP_WIRED_TO
1698                 if (strcmp(ifctx->ireq.ifr_name,
1699                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1700                         continue;
1701 #else
1702                 if ((ifp->if_flags &
1703                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1704                     IFF_BROADCAST)
1705                         continue;
1706 #endif
1707                 if (gctx->interfaces != NULL)
1708                         gctx->lastinterface->next = ifctx;
1709                 else
1710                         gctx->interfaces = ifctx;
1711                 ifctx->ifp = ifp;
1712                 gctx->lastinterface = ifctx;
1713                 ifctx = allocifctx(gctx);
1714         }
1715         free(ifctx, M_TEMP);
1716
1717         if (gctx->interfaces == NULL) {
1718 #ifdef BOOTP_WIRED_TO
1719                 panic("bootpc_init: Could not find interface specified "
1720                       "by BOOTP_WIRED_TO: "
1721                       __XSTRING(BOOTP_WIRED_TO));
1722 #else
1723                 panic("bootpc_init: no suitable interface");
1724 #endif
1725         }
1726
1727         gctx->gotrootpath = 0;
1728         gctx->gotswappath = 0;
1729         gctx->gotgw = 0;
1730
1731         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1732                 bootpc_fakeup_interface(ifctx, gctx, td);
1733
1734         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1735                 bootpc_compose_query(ifctx, gctx, td);
1736
1737         ifctx = gctx->interfaces;
1738         error = bootpc_call(gctx, td);
1739
1740         if (error != 0) {
1741 #ifdef BOOTP_NFSROOT
1742                 panic("BOOTP call failed");
1743 #else
1744                 printf("BOOTP call failed\n");
1745 #endif
1746         }
1747
1748         mountopts(&nd->root_args, NULL);
1749
1750         mountopts(&nd->swap_args, NULL);
1751
1752         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1753                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1754                         bootpc_decode_reply(nd, ifctx, gctx);
1755
1756         if (gctx->gotswappath == 0)
1757                 nd->swap_nblks = 0;
1758 #ifdef BOOTP_NFSROOT
1759         if (gctx->gotrootpath == 0)
1760                 panic("bootpc: No root path offered");
1761 #endif
1762
1763         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1764                 bootpc_adjust_interface(ifctx, gctx, td);
1765
1766                 soclose(ifctx->so);
1767         }
1768
1769         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1770                 if (ifctx->gotrootpath != 0)
1771                         break;
1772         if (ifctx == NULL) {
1773                 for (ifctx = gctx->interfaces;
1774                      ifctx != NULL;
1775                      ifctx = ifctx->next)
1776                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1777                                 break;
1778         }
1779         if (ifctx == NULL)
1780                 goto out;
1781
1782         if (gctx->gotrootpath != 0) {
1783
1784                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1785                                  nd->root_fh, &nd->root_fhsize,
1786                                  &nd->root_args, td);
1787                 if (error != 0)
1788                         panic("nfs_boot: mountd root, error=%d", error);
1789
1790                 if (gctx->gotswappath != 0) {
1791
1792                         error = md_mount(&nd->swap_saddr,
1793                                          nd->swap_hostnam,
1794                                          nd->swap_fh, &nd->swap_fhsize,
1795                                          &nd->swap_args, td);
1796                         if (error != 0)
1797                                 panic("nfs_boot: mountd swap, error=%d",
1798                                       error);
1799
1800                         error = md_lookup_swap(&nd->swap_saddr,
1801                                                gctx->lookup_path,
1802                                                nd->swap_fh, &nd->swap_fhsize,
1803                                                &nd->swap_args, td);
1804                         if (error != 0)
1805                                 panic("nfs_boot: lookup swap, error=%d",
1806                                       error);
1807                 }
1808                 nfs_diskless_valid = 3;
1809         }
1810
1811         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1812         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1813         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1814         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1815                 ifctx->myaddr.sin_addr.s_addr |
1816                 ~ ifctx->netmask.sin_addr.s_addr;
1817         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1818
1819 out:
1820         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1821                 nctx = ifctx->next;
1822                 free(ifctx, M_TEMP);
1823         }
1824         free(gctx, M_TEMP);
1825 }
1826
1827 /*
1828  * RPC: mountd/mount
1829  * Given a server pathname, get an NFS file handle.
1830  * Also, sets sin->sin_port to the NFS service port.
1831  */
1832 static int
1833 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
1834     struct nfs_args *args, struct thread *td)
1835 {
1836         struct mbuf *m;
1837         int error;
1838         int authunixok;
1839         int authcount;
1840         int authver;
1841
1842 #ifdef BOOTP_NFSV3
1843         /* First try NFS v3 */
1844         /* Get port number for MOUNTD. */
1845         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1846                              &mdsin->sin_port, td);
1847         if (error == 0) {
1848                 m = xdr_string_encode(path, strlen(path));
1849
1850                 /* Do RPC to mountd. */
1851                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1852                                   RPCMNT_MOUNT, &m, NULL, td);
1853         }
1854         if (error == 0) {
1855                 args->flags |= NFSMNT_NFSV3;
1856         } else {
1857 #endif
1858                 /* Fallback to NFS v2 */
1859
1860                 /* Get port number for MOUNTD. */
1861                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1862                                      &mdsin->sin_port, td);
1863                 if (error != 0)
1864                         return error;
1865
1866                 m = xdr_string_encode(path, strlen(path));
1867
1868                 /* Do RPC to mountd. */
1869                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1870                                   RPCMNT_MOUNT, &m, NULL, td);
1871                 if (error != 0)
1872                         return error;   /* message already freed */
1873
1874 #ifdef BOOTP_NFSV3
1875         }
1876 #endif
1877
1878         if (xdr_int_decode(&m, &error) != 0 || error != 0)
1879                 goto bad;
1880
1881         if ((args->flags & NFSMNT_NFSV3) != 0) {
1882                 if (xdr_int_decode(&m, fhsizep) != 0 ||
1883                     *fhsizep > NFSX_V3FHMAX ||
1884                     *fhsizep <= 0)
1885                         goto bad;
1886         } else
1887                 *fhsizep = NFSX_V2FH;
1888
1889         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1890                 goto bad;
1891
1892         if (args->flags & NFSMNT_NFSV3) {
1893                 if (xdr_int_decode(&m, &authcount) != 0)
1894                         goto bad;
1895                 authunixok = 0;
1896                 if (authcount < 0 || authcount > 100)
1897                         goto bad;
1898                 while (authcount > 0) {
1899                         if (xdr_int_decode(&m, &authver) != 0)
1900                                 goto bad;
1901                         if (authver == RPCAUTH_UNIX)
1902                                 authunixok = 1;
1903                         authcount--;
1904                 }
1905                 if (authunixok == 0)
1906                         goto bad;
1907         }
1908
1909         /* Set port number for NFS use. */
1910         error = krpc_portmap(mdsin, NFS_PROG,
1911                              (args->flags &
1912                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1913                              &mdsin->sin_port, td);
1914
1915         goto out;
1916
1917 bad:
1918         error = EBADRPC;
1919
1920 out:
1921         m_freem(m);
1922         return error;
1923 }
1924
1925 static int
1926 md_lookup_swap(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
1927     struct nfs_args *args, struct thread *td)
1928 {
1929         struct mbuf *m;
1930         int error;
1931         int size = -1;
1932         int attribs_present;
1933         int status;
1934         union {
1935                 u_int32_t v2[17];
1936                 u_int32_t v3[21];
1937         } fattribs;
1938
1939         m = m_get(M_TRYWAIT, MT_DATA);
1940         if (m == NULL)
1941                 return ENOBUFS;
1942
1943         if ((args->flags & NFSMNT_NFSV3) != 0) {
1944                 *mtod(m, u_int32_t *) = txdr_unsigned(*fhsizep);
1945                 bcopy(fhp, mtod(m, u_char *) + sizeof(u_int32_t), *fhsizep);
1946                 m->m_len = *fhsizep + sizeof(u_int32_t);
1947         } else {
1948                 bcopy(fhp, mtod(m, u_char *), NFSX_V2FH);
1949                 m->m_len = NFSX_V2FH;
1950         }
1951
1952         m->m_next = xdr_string_encode(path, strlen(path));
1953         if (m->m_next == NULL) {
1954                 error = ENOBUFS;
1955                 goto out;
1956         }
1957
1958         /* Do RPC to nfsd. */
1959         if ((args->flags & NFSMNT_NFSV3) != 0)
1960                 error = krpc_call(mdsin, NFS_PROG, NFS_VER3,
1961                                   NFSPROC_LOOKUP, &m, NULL, td);
1962         else
1963                 error = krpc_call(mdsin, NFS_PROG, NFS_VER2,
1964                                   NFSV2PROC_LOOKUP, &m, NULL, td);
1965         if (error != 0)
1966                 return error;   /* message already freed */
1967
1968         if (xdr_int_decode(&m, &status) != 0)
1969                 goto bad;
1970         if (status != 0) {
1971                 error = ENOENT;
1972                 goto out;
1973         }
1974
1975         if ((args->flags & NFSMNT_NFSV3) != 0) {
1976                 if (xdr_int_decode(&m, fhsizep) != 0 ||
1977                     *fhsizep > NFSX_V3FHMAX ||
1978                     *fhsizep <= 0)
1979                         goto bad;
1980         } else
1981                 *fhsizep = NFSX_V2FH;
1982
1983         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1984                 goto bad;
1985
1986         if ((args->flags & NFSMNT_NFSV3) != 0) {
1987                 if (xdr_int_decode(&m, &attribs_present) != 0)
1988                         goto bad;
1989                 if (attribs_present != 0) {
1990                         if (xdr_opaque_decode(&m, (u_char *) &fattribs.v3,
1991                                               sizeof(u_int32_t) * 21) != 0)
1992                                 goto bad;
1993                         size = fxdr_unsigned(u_int32_t, fattribs.v3[6]);
1994                 }
1995         } else {
1996                 if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2,
1997                                       sizeof(u_int32_t) * 17) != 0)
1998                         goto bad;
1999                 size = fxdr_unsigned(u_int32_t, fattribs.v2[5]);
2000         }
2001
2002         if (nfsv3_diskless.swap_nblks == 0 && size != -1) {
2003                 nfsv3_diskless.swap_nblks = size / 1024;
2004                 printf("md_lookup_swap: Swap size is %d KB\n",
2005                        nfsv3_diskless.swap_nblks);
2006         }
2007
2008         goto out;
2009
2010 bad:
2011         error = EBADRPC;
2012
2013 out:
2014         m_freem(m);
2015         return error;
2016 }