sys/vfs/nfs/bootp_subr.c

   1 /* $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $     */
   2 /* $DragonFly: src/sys/vfs/nfs/bootp_subr.c,v 1.4 2003/07/21 07:57:51 dillon Exp $      */
   3
   4 /*
   5  * Copyright (c) 1995 Gordon Ross, Adam Glass
   6  * Copyright (c) 1992 Regents of the University of California.
   7  * All rights reserved.
   8  *
   9  * This software was developed by the Computer Systems Engineering group
  10  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  11  * contributed to Berkeley.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Lawrence Berkeley Laboratory and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  *
  41  * based on:
  42  *      nfs/krpc_subr.c
  43  *      $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
  44  */
  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/proc.h>
  53 #include <sys/malloc.h>
  54 #include <sys/mount.h>
  55 #include <sys/mbuf.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 <nfs/nfs.h>
  71 #include <nfs/nfsdiskless.h>
  72 #include <nfs/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, exported 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 extern int nfs_diskless_valid;
 217 extern struct nfsv3_diskless nfsv3_diskless;
 218 static char bootp_cookie[128];
 219 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
 220         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
 221
 222 /* mountd RPC */
 223 static int md_mount(struct sockaddr_in *mdsin, char *path,
 224                     u_char *fhp, int *fhsizep,
 225                     struct nfs_args *args,struct thread *td);
 226 static int md_lookup_swap(struct sockaddr_in *mdsin,char *path,
 227                           u_char *fhp, int *fhsizep,
 228                           struct nfs_args *args,
 229                           struct thread *td);
 230 static int setfs(struct sockaddr_in *addr, char *path, char *p);
 231 static int getdec(char **ptr);
 232 static char *substr(char *a,char *b);
 233 static void mountopts(struct nfs_args *args, char *p);
 234 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
 235 static int xdr_int_decode(struct mbuf **ptr, int *iptr);
 236 static void print_in_addr(struct in_addr addr);
 237 static void print_sin_addr(struct sockaddr_in *addr);
 238 static void clear_sinaddr(struct sockaddr_in *sin);
 239 static
 240 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
 241 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 242                                  struct bootpc_globalcontext *gctx,
 243                                  struct thread *td);
 244 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
 245                                  struct bootp_packet *bp, int len, int tag);
 246 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 247                               unsigned char *start, int len, int tag);
 248
 249 #ifdef BOOTP_DEBUG
 250 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
 251 void bootpboot_p_ma(struct sockaddr *ma);
 252 void bootpboot_p_rtentry(struct rtentry *rt);
 253 void bootpboot_p_tree(struct radix_node *rn);
 254 void bootpboot_p_rtlist(void);
 255 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
 256 void bootpboot_p_iflist(void);
 257 #endif
 258
 259 static int  bootpc_call(struct bootpc_globalcontext *gctx,
 260                         struct thread *td);
 261
 262 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 263                                    struct bootpc_globalcontext *gctx,
 264                                    struct thread *td);
 265
 266 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 267                                    struct bootpc_globalcontext *gctx,
 268                                    struct thread *td);
 269
 270 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
 271                                 struct bootpc_ifcontext *ifctx,
 272                                 struct bootpc_globalcontext *gctx);
 273
 274 static int bootpc_received(struct bootpc_globalcontext *gctx,
 275                            struct bootpc_ifcontext *ifctx);
 276
 277 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
 278 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
 279 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
 280
 281 void bootpc_init(void);
 282
 283 /*
 284  * In order to have multiple active interfaces with address 0.0.0.0
 285  * and be able to send data to a selected interface, we perform
 286  * some tricks:
 287  *
 288  *  - The 'broadcast' address is different for each interface.
 289  *
 290  *  - We temporarily add routing pointing 255.255.255.255 to the
 291  *    selected interface broadcast address, thus the packet sent
 292  *    goes to that interface.
 293  */
 294
 295 #ifdef BOOTP_DEBUG
 296 void
 297 bootpboot_p_sa(struct sockaddr *sa,
 298                struct sockaddr *ma)
 299 {
 300         if (sa == NULL) {
 301                 printf("(sockaddr *) <null>");
 302                 return;
 303         }
 304         switch (sa->sa_family) {
 305         case AF_INET:
 306         {
 307                 struct sockaddr_in *sin;
 308
 309                 sin = (struct sockaddr_in *) sa;
 310                 printf("inet ");
 311                 print_sin_addr(sin);
 312                 if (ma != NULL) {
 313                         sin = (struct sockaddr_in *) ma;
 314                         printf(" mask ");
 315                         print_sin_addr(sin);
 316                 }
 317         }
 318         break;
 319         case AF_LINK:
 320         {
 321                 struct sockaddr_dl *sli;
 322                 int i;
 323
 324                 sli = (struct sockaddr_dl *) sa;
 325                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
 326                 for (i = 0; i < sli->sdl_alen; i++) {
 327                         if (i > 0)
 328                                 printf(":");
 329                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
 330                 }
 331         }
 332         break;
 333         default:
 334                 printf("af%d", sa->sa_family);
 335         }
 336 }
 337
 338
 339 void
 340 bootpboot_p_ma(struct sockaddr *ma)
 341 {
 342         if (ma == NULL) {
 343                 printf("<null>");
 344                 return;
 345         }
 346         printf("%x", *(int *)ma);
 347 }
 348
 349
 350 void
 351 bootpboot_p_rtentry(struct rtentry *rt)
 352 {
 353         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
 354         printf(" ");
 355         bootpboot_p_ma(rt->rt_genmask);
 356         printf(" ");
 357         bootpboot_p_sa(rt->rt_gateway, NULL);
 358         printf(" ");
 359         printf("flags %x", (unsigned short) rt->rt_flags);
 360         printf(" %d", (int) rt->rt_rmx.rmx_expire);
 361         printf(" %s%d\n", rt->rt_ifp->if_name, rt->rt_ifp->if_unit);
 362 }
 363
 364
 365 void
 366 bootpboot_p_tree(struct radix_node *rn)
 367 {
 368         while (rn != NULL) {
 369                 if (rn->rn_bit < 0) {
 370                         if ((rn->rn_flags & RNF_ROOT) != 0) {
 371                         } else {
 372                                 bootpboot_p_rtentry((struct rtentry *) rn);
 373                         }
 374                         rn = rn->rn_dupedkey;
 375                 } else {
 376                         bootpboot_p_tree(rn->rn_left);
 377                         bootpboot_p_tree(rn->rn_right);
 378                         return;
 379                 }
 380         }
 381 }
 382
 383
 384 void
 385 bootpboot_p_rtlist(void)
 386 {
 387         printf("Routing table:\n");
 388         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
 389 }
 390
 391
 392 void
 393 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
 394 {
 395         printf("%s%d flags %x, addr ",
 396                ifp->if_name,
 397                ifp->if_unit,
 398                (unsigned short) ifp->if_flags);
 399         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
 400         printf(", broadcast ");
 401         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
 402         printf(", netmask ");
 403         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
 404         printf("\n");
 405 }
 406
 407
 408 void
 409 bootpboot_p_iflist(void)
 410 {
 411         struct ifnet *ifp;
 412         struct ifaddr *ifa;
 413
 414         printf("Interface list:\n");
 415         for (ifp = TAILQ_FIRST(&ifnet);
 416              ifp != NULL;
 417              ifp = TAILQ_NEXT(ifp, if_link)) {
 418                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
 419                      ifa != NULL;
 420                      ifa = TAILQ_NEXT(ifa, ifa_link))
 421                         if (ifa->ifa_addr->sa_family == AF_INET)
 422                                 bootpboot_p_if(ifp, ifa);
 423         }
 424 }
 425 #endif /* defined(BOOTP_DEBUG) */
 426
 427
 428 static void
 429 clear_sinaddr(struct sockaddr_in *sin)
 430 {
 431         bzero(sin, sizeof(*sin));
 432         sin->sin_len = sizeof(*sin);
 433         sin->sin_family = AF_INET;
 434         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
 435         sin->sin_port = 0;
 436 }
 437
 438
 439 static struct bootpc_ifcontext *
 440 allocifctx(struct bootpc_globalcontext *gctx)
 441 {
 442         struct bootpc_ifcontext *ifctx;
 443         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
 444                                                    M_TEMP, M_WAITOK);
 445         if (ifctx == NULL)
 446                 panic("Failed to allocate bootp interface context structure");
 447
 448         bzero(ifctx, sizeof(*ifctx));
 449         ifctx->xid = gctx->xid;
 450 #ifdef BOOTP_NO_DHCP
 451         ifctx->state = IF_BOOTP_UNRESOLVED;
 452 #else
 453         ifctx->state = IF_DHCP_UNRESOLVED;
 454 #endif
 455         gctx->xid += 0x100;
 456         return ifctx;
 457 }
 458
 459
 460 static __inline int
 461 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
 462 {
 463         if (ifctx->state == IF_BOOTP_RESOLVED ||
 464             ifctx->state == IF_DHCP_RESOLVED)
 465                 return 1;
 466         return 0;
 467 }
 468
 469
 470 static __inline int
 471 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
 472 {
 473         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
 474             ifctx->state == IF_DHCP_UNRESOLVED)
 475                 return 1;
 476         return 0;
 477 }
 478
 479
 480 static __inline int
 481 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
 482 {
 483         if (ifctx->state == IF_BOOTP_FAILED ||
 484             ifctx->state == IF_DHCP_FAILED)
 485                 return 1;
 486         return 0;
 487 }
 488
 489
 490 static int
 491 bootpc_received(struct bootpc_globalcontext *gctx,
 492                 struct bootpc_ifcontext *ifctx)
 493 {
 494         unsigned char dhcpreplytype;
 495         char *p;
 496         /*
 497          * Need timeout for fallback to less
 498          * desirable alternative.
 499          */
 500
 501
 502         /* This call used for the side effect (badopt flag) */
 503         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
 504                           gctx->replylen,
 505                           TAG_END);
 506
 507         /* If packet is invalid, ignore it */
 508         if (gctx->tmptag.badopt != 0)
 509                 return 0;
 510
 511         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
 512                        gctx->replylen, TAG_DHCP_MSGTYPE);
 513         if (p != NULL)
 514                 dhcpreplytype = *p;
 515         else
 516                 dhcpreplytype = DHCP_NOMSG;
 517
 518         switch (ifctx->dhcpquerytype) {
 519         case DHCP_DISCOVER:
 520                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
 521 #ifndef BOOTP_FORCE_DHCP
 522                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
 523 #endif
 524                         )
 525                         return 0;
 526                 break;
 527         case DHCP_REQUEST:
 528                 if (dhcpreplytype != DHCP_ACK)
 529                         return 0;
 530         case DHCP_NOMSG:
 531         }
 532
 533
 534         /* Ignore packet unless it gives us a root tag we didn't have */
 535
 536         if ((ifctx->state == IF_BOOTP_RESOLVED ||
 537              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 538               (ifctx->state == IF_DHCP_OFFERED ||
 539                ifctx->state == IF_DHCP_RESOLVED))) &&
 540             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 541                         ifctx->replylen,
 542                         TAG_ROOT) != NULL ||
 543              bootpc_tag(&gctx->tmptag, &gctx->reply,
 544                         gctx->replylen,
 545                         TAG_ROOT) == NULL))
 546                 return 0;
 547
 548         bcopy(&gctx->reply,
 549               &ifctx->reply,
 550               gctx->replylen);
 551         ifctx->replylen = gctx->replylen;
 552
 553         /* XXX: Only reset if 'perfect' response */
 554         if (ifctx->state == IF_BOOTP_UNRESOLVED)
 555                 ifctx->state = IF_BOOTP_RESOLVED;
 556         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
 557                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
 558                 if (dhcpreplytype == DHCP_OFFER)
 559                         ifctx->state = IF_DHCP_OFFERED;
 560                 else
 561                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
 562         } else if (ifctx->state == IF_DHCP_OFFERED &&
 563                    ifctx->dhcpquerytype == DHCP_REQUEST)
 564                 ifctx->state = IF_DHCP_RESOLVED;
 565
 566
 567         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 568             ifctx->state != IF_BOOTP_RESOLVED) {
 569                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
 570                                ifctx->replylen, TAG_DHCP_SERVERID);
 571                 if (p != NULL && gctx->tmptag.taglen == 4) {
 572                         memcpy(&ifctx->dhcpserver, p, 4);
 573                         ifctx->gotdhcpserver = 1;
 574                 } else
 575                         ifctx->gotdhcpserver = 0;
 576                 return 1;
 577         }
 578
 579         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 580                                          ifctx->replylen,
 581                                          TAG_ROOT) != NULL);
 582         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 583                                    ifctx->replylen,
 584                                    TAG_ROUTERS) != NULL);
 585         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 586                                         ifctx->replylen,
 587                                         TAG_SUBNETMASK) != NULL);
 588         return 1;
 589 }
 590
 591 static int
 592 bootpc_call(struct bootpc_globalcontext *gctx,
 593             struct thread *td)
 594 {
 595         struct socket *so;
 596         struct sockaddr_in *sin, dst;
 597         struct uio auio;
 598         struct sockopt sopt;
 599         struct iovec aio;
 600         int error, on, rcvflg, timo, len;
 601         time_t atimo;
 602         time_t rtimo;
 603         struct timeval tv;
 604         struct bootpc_ifcontext *ifctx;
 605         int outstanding;
 606         int gotrootpath;
 607         int retry;
 608         const char *s;
 609
 610         /*
 611          * Create socket and set its recieve timeout.
 612          */
 613         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
 614         if (error != 0)
 615                 goto out;
 616
 617         tv.tv_sec = 1;
 618         tv.tv_usec = 0;
 619         bzero(&sopt, sizeof(sopt));
 620         sopt.sopt_level = SOL_SOCKET;
 621         sopt.sopt_name = SO_RCVTIMEO;
 622         sopt.sopt_val = &tv;
 623         sopt.sopt_valsize = sizeof tv;
 624
 625         error = sosetopt(so, &sopt);
 626         if (error != 0)
 627                 goto out;
 628
 629         /*
 630          * Enable broadcast.
 631          */
 632         on = 1;
 633         sopt.sopt_name = SO_BROADCAST;
 634         sopt.sopt_val = &on;
 635         sopt.sopt_valsize = sizeof on;
 636
 637         error = sosetopt(so, &sopt);
 638         if (error != 0)
 639                 goto out;
 640
 641         /*
 642          * Disable routing.
 643          */
 644
 645         on = 1;
 646         sopt.sopt_name = SO_DONTROUTE;
 647         sopt.sopt_val = &on;
 648         sopt.sopt_valsize = sizeof on;
 649
 650         error = sosetopt(so, &sopt);
 651         if (error != 0)
 652                 goto out;
 653
 654         /*
 655          * Bind the local endpoint to a bootp client port.
 656          */
 657         sin = &dst;
 658         clear_sinaddr(sin);
 659         sin->sin_port = htons(IPPORT_BOOTPC);
 660         error = sobind(so, (struct sockaddr *)sin, td);
 661         if (error != 0) {
 662                 printf("bind failed\n");
 663                 goto out;
 664         }
 665
 666         /*
 667          * Setup socket address for the server.
 668          */
 669         sin = &dst;
 670         clear_sinaddr(sin);
 671         sin->sin_addr.s_addr = INADDR_BROADCAST;
 672         sin->sin_port = htons(IPPORT_BOOTPS);
 673
 674         /*
 675          * Send it, repeatedly, until a reply is received,
 676          * but delay each re-send by an increasing amount.
 677          * If the delay hits the maximum, start complaining.
 678          */
 679         timo = 0;
 680         rtimo = 0;
 681         for (;;) {
 682
 683                 outstanding = 0;
 684                 gotrootpath = 0;
 685
 686                 for (ifctx = gctx->interfaces;
 687                      ifctx != NULL;
 688                      ifctx = ifctx->next) {
 689                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 690                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 691                                        ifctx->replylen,
 692                                        TAG_ROOT) != NULL)
 693                                 gotrootpath = 1;
 694                 }
 695
 696                 for (ifctx = gctx->interfaces;
 697                      ifctx != NULL;
 698                      ifctx = ifctx->next) {
 699                         ifctx->outstanding = 0;
 700                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 701                             gotrootpath != 0) {
 702                                 continue;
 703                         }
 704                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 705                                 continue;
 706
 707                         outstanding++;
 708                         ifctx->outstanding = 1;
 709
 710                         /* Proceed to next step in DHCP negotiation */
 711                         if ((ifctx->state == IF_DHCP_OFFERED &&
 712                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 713                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 714                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 715                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 716                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 717                                 ifctx->sentmsg = 0;
 718                                 bootpc_compose_query(ifctx, gctx, td);
 719                         }
 720
 721                         /* Send BOOTP request (or re-send). */
 722
 723                         if (ifctx->sentmsg == 0) {
 724                                 switch(ifctx->dhcpquerytype) {
 725                                 case DHCP_DISCOVER:
 726                                         s = "DHCP Discover";
 727                                         break;
 728                                 case DHCP_REQUEST:
 729                                         s = "DHCP Request";
 730                                         break;
 731                                 case DHCP_NOMSG:
 732                                 default:
 733                                         s = "BOOTP Query";
 734                                         break;
 735                                 }
 736                                 printf("Sending %s packet from "
 737                                        "interface %s (%*D)\n",
 738                                        s,
 739                                        ifctx->ireq.ifr_name,
 740                                        ifctx->sdl->sdl_alen,
 741                                        (unsigned char *) LLADDR(ifctx->sdl),
 742                                        ":");
 743                                 ifctx->sentmsg = 1;
 744                         }
 745
 746                         aio.iov_base = (caddr_t) &ifctx->call;
 747                         aio.iov_len = sizeof(ifctx->call);
 748
 749                         auio.uio_iov = &aio;
 750                         auio.uio_iovcnt = 1;
 751                         auio.uio_segflg = UIO_SYSSPACE;
 752                         auio.uio_rw = UIO_WRITE;
 753                         auio.uio_offset = 0;
 754                         auio.uio_resid = sizeof(ifctx->call);
 755                         auio.uio_td = td;
 756
 757                         /* Set netmask to 0.0.0.0 */
 758
 759                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 760                         clear_sinaddr(sin);
 761                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 762                                         (caddr_t) &ifctx->ireq, td);
 763                         if (error != 0)
 764                                 panic("bootpc_call:"
 765                                       "set if netmask, error=%d",
 766                                       error);
 767
 768                         error = sosend(so, (struct sockaddr *) &dst,
 769                                        &auio, NULL, NULL, 0, td);
 770                         if (error != 0) {
 771                                 printf("bootpc_call: sosend: %d state %08x\n",
 772                                        error, (int) so->so_state);
 773                         }
 774
 775                         /* XXX: Is this needed ? */
 776                         tsleep(&error, 0, "bootpw", 10);
 777
 778                         /* Set netmask to 255.0.0.0 */
 779
 780                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 781                         clear_sinaddr(sin);
 782                         sin->sin_addr.s_addr = htonl(0xff000000u);
 783                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 784                                         (caddr_t) &ifctx->ireq, td);
 785                         if (error != 0)
 786                                 panic("bootpc_call:"
 787                                       "set if netmask, error=%d",
 788                                       error);
 789
 790                 }
 791
 792                 if (outstanding == 0 &&
 793                     (rtimo == 0 || time_second >= rtimo)) {
 794                         error = 0;
 795                         goto gotreply;
 796                 }
 797
 798                 /* Determine new timeout. */
 799                 if (timo < MAX_RESEND_DELAY)
 800                         timo++;
 801                 else {
 802                         printf("DHCP/BOOTP timeout for server ");
 803                         print_sin_addr(&dst);
 804                         printf("\n");
 805                 }
 806
 807                 /*
 808                  * Wait for up to timo seconds for a reply.
 809                  * The socket receive timeout was set to 1 second.
 810                  */
 811                 atimo = timo + time_second;
 812                 while (time_second < atimo) {
 813                         aio.iov_base = (caddr_t) &gctx->reply;
 814                         aio.iov_len = sizeof(gctx->reply);
 815
 816                         auio.uio_iov = &aio;
 817                         auio.uio_iovcnt = 1;
 818                         auio.uio_segflg = UIO_SYSSPACE;
 819                         auio.uio_rw = UIO_READ;
 820                         auio.uio_offset = 0;
 821                         auio.uio_resid = sizeof(gctx->reply);
 822                         auio.uio_td = td;
 823
 824                         rcvflg = 0;
 825                         error = soreceive(so, NULL, &auio,
 826                                           NULL, NULL, &rcvflg);
 827                         gctx->secs = time_second - gctx->starttime;
 828                         for (ifctx = gctx->interfaces;
 829                              ifctx != NULL;
 830                              ifctx = ifctx->next) {
 831                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 832                                     bootpc_ifctx_isfailed(ifctx) != 0)
 833                                         continue;
 834
 835                                 ifctx->call.secs = htons(gctx->secs);
 836                         }
 837                         if (error == EWOULDBLOCK)
 838                                 continue;
 839                         if (error != 0)
 840                                 goto out;
 841                         len = sizeof(gctx->reply) - auio.uio_resid;
 842
 843                         /* Do we have the required number of bytes ? */
 844                         if (len < BOOTP_MIN_LEN)
 845                                 continue;
 846                         gctx->replylen = len;
 847
 848                         /* Is it a reply? */
 849                         if (gctx->reply.op != BOOTP_REPLY)
 850                                 continue;
 851
 852                         /* Is this an answer to our query */
 853                         for (ifctx = gctx->interfaces;
 854                              ifctx != NULL;
 855                              ifctx = ifctx->next) {
 856                                 if (gctx->reply.xid != ifctx->call.xid)
 857                                         continue;
 858
 859                                 /* Same HW address size ? */
 860                                 if (gctx->reply.hlen != ifctx->call.hlen)
 861                                         continue;
 862
 863                                 /* Correct HW address ? */
 864                                 if (bcmp(gctx->reply.chaddr,
 865                                          ifctx->call.chaddr,
 866                                          ifctx->call.hlen) != 0)
 867                                         continue;
 868
 869                                 break;
 870                         }
 871
 872                         if (ifctx != NULL) {
 873                                 s =  bootpc_tag(&gctx->tmptag,
 874                                                 &gctx->reply,
 875                                                 gctx->replylen,
 876                                                 TAG_DHCP_MSGTYPE);
 877                                 if (s != NULL) {
 878                                         switch (*s) {
 879                                         case DHCP_OFFER:
 880                                                 s = "DHCP Offer";
 881                                                 break;
 882                                         case DHCP_ACK:
 883                                                 s = "DHCP Ack";
 884                                                 break;
 885                                         default:
 886                                                 s = "DHCP (unexpected)";
 887                                                 break;
 888                                         }
 889                                 } else
 890                                         s = "BOOTP Reply";
 891
 892                                 printf("Received %s packet"
 893                                        " on %s from ",
 894                                        s,
 895                                        ifctx->ireq.ifr_name);
 896                                 print_in_addr(gctx->reply.siaddr);
 897                                 if (gctx->reply.giaddr.s_addr !=
 898                                     htonl(INADDR_ANY)) {
 899                                         printf(" via ");
 900                                         print_in_addr(gctx->reply.giaddr);
 901                                 }
 902                                 if (bootpc_received(gctx, ifctx) != 0) {
 903                                         printf(" (accepted)");
 904                                         if (ifctx->outstanding) {
 905                                                 ifctx->outstanding = 0;
 906                                                 outstanding--;
 907                                         }
 908                                         /* Network settle delay */
 909                                         if (outstanding == 0)
 910                                                 atimo = time_second +
 911                                                         BOOTP_SETTLE_DELAY;
 912                                 } else
 913                                         printf(" (ignored)");
 914                                 if (ifctx->gotrootpath) {
 915                                         gotrootpath = 1;
 916                                         rtimo = time_second +
 917                                                 BOOTP_SETTLE_DELAY;
 918                                         printf(" (got root path)");
 919                                 } else
 920                                         printf(" (no root path)");
 921                                 printf("\n");
 922                         }
 923                 } /* while secs */
 924 #ifdef BOOTP_TIMEOUT
 925                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 926                         break;
 927 #endif
 928                 /* Force a retry if halfway in DHCP negotiation */
 929                 retry = 0;
 930                 for (ifctx = gctx->interfaces; ifctx != NULL;
 931                      ifctx = ifctx->next) {
 932                         if (ifctx->state == IF_DHCP_OFFERED) {
 933                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 934                                         retry = 1;
 935                                 else
 936                                         ifctx->state = IF_DHCP_UNRESOLVED;
 937                         }
 938                 }
 939
 940                 if (retry != 0)
 941                         continue;
 942
 943                 if (gotrootpath != 0) {
 944                         gctx->gotrootpath = gotrootpath;
 945                         if (rtimo != 0 && time_second >= rtimo)
 946                                 break;
 947                 }
 948         } /* forever send/receive */
 949
 950         /*
 951          * XXX: These are errors of varying seriousness being silently
 952          * ignored
 953          */
 954
 955         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 956                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 957                         printf("%s timeout for interface %s\n",
 958                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 959                                "DHCP" : "BOOTP",
 960                                ifctx->ireq.ifr_name);
 961                 }
 962         }
 963         if (gctx->gotrootpath != 0) {
 964 #if 0
 965                 printf("Got a root path, ignoring remaining timeout\n");
 966 #endif
 967                 error = 0;
 968                 goto out;
 969         }
 970 #ifndef BOOTP_NFSROOT
 971         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 972                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 973                         error = 0;
 974                         goto out;
 975                 }
 976         }
 977 #endif
 978         error = ETIMEDOUT;
 979         goto out;
 980
 981 gotreply:
 982 out:
 983         soclose(so);
 984         return error;
 985 }
 986
 987
 988 static int
 989 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 990                         struct bootpc_globalcontext *gctx,
 991                         struct thread *td)
 992 {
 993         struct sockaddr_in *sin;
 994         int error;
 995
 996         struct ifreq *ireq;
 997         struct socket *so;
 998         struct ifaddr *ifa;
 999         struct sockaddr_dl *sdl;
1000
1001         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
1002         if (error != 0)
1003                 panic("nfs_boot: socreate, error=%d", error);
1004
1005         ireq = &ifctx->ireq;
1006         so = ifctx->so;
1007
1008         /*
1009          * Bring up the interface.
1010          *
1011          * Get the old interface flags and or IFF_UP into them; if
1012          * IFF_UP set blindly, interface selection can be clobbered.
1013          */
1014         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1015         if (error != 0)
1016                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
1017         ireq->ifr_flags |= IFF_UP;
1018         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1019         if (error != 0)
1020                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1021
1022         /*
1023          * Do enough of ifconfig(8) so that the chosen interface
1024          * can talk to the servers.  (just set the address)
1025          */
1026
1027         /* addr is 0.0.0.0 */
1028
1029         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1030         clear_sinaddr(sin);
1031         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1032         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1033                 panic("bootpc_fakeup_interface: "
1034                       "set if addr, error=%d", error);
1035
1036         /* netmask is 255.0.0.0 */
1037
1038         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1039         clear_sinaddr(sin);
1040         sin->sin_addr.s_addr = htonl(0xff000000u);
1041         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
1042         if (error != 0)
1043                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1044                       error);
1045
1046         /* Broadcast is 255.255.255.255 */
1047
1048         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1049         clear_sinaddr(sin);
1050         clear_sinaddr(&ifctx->broadcast);
1051         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1052         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1053
1054         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
1055         if (error != 0 && error != EADDRNOTAVAIL)
1056                 panic("bootpc_fakeup_interface: "
1057                       "set if broadcast addr, error=%d",
1058                       error);
1059         error = 0;
1060
1061         /* Get HW address */
1062
1063         sdl = NULL;
1064         for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
1065              ifa != NULL;
1066              ifa = TAILQ_NEXT(ifa,ifa_link))
1067                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1068                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1069                     sdl->sdl_type == IFT_ETHER)
1070                         break;
1071
1072         if (sdl == NULL)
1073                 panic("bootpc: Unable to find HW address for %s",
1074                       ifctx->ireq.ifr_name);
1075         ifctx->sdl = sdl;
1076
1077         return error;
1078 }
1079
1080
1081 static int
1082 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1083                         struct bootpc_globalcontext *gctx,
1084                         struct thread *td)
1085 {
1086         int error;
1087         struct sockaddr_in defdst;
1088         struct sockaddr_in defmask;
1089         struct sockaddr_in *sin;
1090
1091         struct ifreq *ireq;
1092         struct socket *so;
1093         struct sockaddr_in *myaddr;
1094         struct sockaddr_in *netmask;
1095         struct sockaddr_in *gw;
1096
1097         ireq = &ifctx->ireq;
1098         so = ifctx->so;
1099         myaddr = &ifctx->myaddr;
1100         netmask = &ifctx->netmask;
1101         gw = &ifctx->gw;
1102
1103         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1104
1105                 /* Shutdown interfaces where BOOTP failed */
1106
1107                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1108                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1109                 if (error != 0)
1110                         panic("bootpc_adjust_interface: "
1111                               "SIOCGIFFLAGS, error=%d", error);
1112                 ireq->ifr_flags &= ~IFF_UP;
1113                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1114                 if (error != 0)
1115                         panic("bootpc_adjust_interface: "
1116                               "SIOCSIFFLAGS, error=%d", error);
1117
1118                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1119                 clear_sinaddr(sin);
1120                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
1121                 if (error != 0 && (error != EADDRNOTAVAIL ||
1122                                    ifctx == gctx->interfaces))
1123                         panic("bootpc_adjust_interface: "
1124                               "SIOCDIFADDR, error=%d", error);
1125
1126                 return 0;
1127         }
1128
1129         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1130         /*
1131          * Do enough of ifconfig(8) so that the chosen interface
1132          * can talk to the servers.  (just set the address)
1133          */
1134         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1135         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
1136         if (error != 0)
1137                 panic("bootpc_adjust_interface: "
1138                       "set if netmask, error=%d", error);
1139
1140         /* Broadcast is with host part of IP address all 1's */
1141
1142         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1143         clear_sinaddr(sin);
1144         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1145                 ~ netmask->sin_addr.s_addr;
1146         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
1147         if (error != 0)
1148                 panic("bootpc_adjust_interface: "
1149                       "set if broadcast addr, error=%d", error);
1150
1151         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1152         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1153         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1154                 panic("bootpc_adjust_interface: "
1155                       "set if addr, error=%d", error);
1156
1157         /* Add new default route */
1158
1159         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1160                 clear_sinaddr(&defdst);
1161                 clear_sinaddr(&defmask);
1162                 error = rtrequest(RTM_ADD,
1163                                   (struct sockaddr *) &defdst,
1164                                   (struct sockaddr *) gw,
1165                                   (struct sockaddr *) &defmask,
1166                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
1167                 if (error != 0) {
1168                         printf("bootpc_adjust_interface: "
1169                                "add net route, error=%d\n", error);
1170                         return error;
1171                 }
1172         }
1173
1174         return 0;
1175 }
1176
1177
1178 static int
1179 setfs(struct sockaddr_in *addr, char *path, char *p)
1180 {
1181         unsigned int ip;
1182         int val;
1183
1184         ip = 0;
1185         if (((val = getdec(&p)) < 0) || (val > 255))
1186                 return 0;
1187         ip = val << 24;
1188         if (*p != '.')
1189                 return 0;
1190         p++;
1191         if (((val = getdec(&p)) < 0) || (val > 255))
1192                 return 0;
1193         ip |= (val << 16);
1194         if (*p != '.')
1195                 return 0;
1196         p++;
1197         if (((val = getdec(&p)) < 0) || (val > 255))
1198                 return 0;
1199         ip |= (val << 8);
1200         if (*p != '.')
1201                 return 0;
1202         p++;
1203         if (((val = getdec(&p)) < 0) || (val > 255))
1204                 return 0;
1205         ip |= val;
1206         if (*p != ':')
1207                 return 0;
1208         p++;
1209
1210         addr->sin_addr.s_addr = htonl(ip);
1211         addr->sin_len = sizeof(struct sockaddr_in);
1212         addr->sin_family = AF_INET;
1213
1214         strncpy(path, p, MNAMELEN - 1);
1215         return 1;
1216 }
1217
1218
1219 static int
1220 getdec(char **ptr)
1221 {
1222         char *p;
1223         int ret;
1224
1225         p = *ptr;
1226         ret = 0;
1227         if ((*p < '0') || (*p > '9'))
1228                 return -1;
1229         while ((*p >= '0') && (*p <= '9')) {
1230                 ret = ret * 10 + (*p - '0');
1231                 p++;
1232         }
1233         *ptr = p;
1234         return ret;
1235 }
1236
1237
1238 static char *
1239 substr(char *a, char *b)
1240 {
1241         char *loc1;
1242         char *loc2;
1243
1244         while (*a != '\0') {
1245                 loc1 = a;
1246                 loc2 = b;
1247                 while (*loc1 == *loc2++) {
1248                         if (*loc1 == '\0')
1249                                 return 0;
1250                         loc1++;
1251                         if (*loc2 == '\0')
1252                                 return loc1;
1253                 }
1254                 a++;
1255         }
1256         return 0;
1257 }
1258
1259
1260 static void
1261 mountopts(struct nfs_args *args, char *p)
1262 {
1263         char *tmp;
1264
1265         args->version = NFS_ARGSVERSION;
1266         args->rsize = 8192;
1267         args->wsize = 8192;
1268         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1269         args->sotype = SOCK_DGRAM;
1270         if (p == NULL)
1271                 return;
1272         if ((tmp = (char *)substr(p, "rsize=")))
1273                 args->rsize = getdec(&tmp);
1274         if ((tmp = (char *)substr(p, "wsize=")))
1275                 args->wsize = getdec(&tmp);
1276         if ((tmp = (char *)substr(p, "intr")))
1277                 args->flags |= NFSMNT_INT;
1278         if ((tmp = (char *)substr(p, "soft")))
1279                 args->flags |= NFSMNT_SOFT;
1280         if ((tmp = (char *)substr(p, "noconn")))
1281                 args->flags |= NFSMNT_NOCONN;
1282         if ((tmp = (char *)substr(p, "tcp")))
1283                 args->sotype = SOCK_STREAM;
1284 }
1285
1286
1287 static int
1288 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1289 {
1290         struct mbuf *m;
1291         int alignedlen;
1292
1293         m = *mptr;
1294         alignedlen = ( len + 3 ) & ~3;
1295
1296         if (m->m_len < alignedlen) {
1297                 m = m_pullup(m, alignedlen);
1298                 if (m == NULL) {
1299                         *mptr = NULL;
1300                         return EBADRPC;
1301                 }
1302         }
1303         bcopy(mtod(m, u_char *), buf, len);
1304         m_adj(m, alignedlen);
1305         *mptr = m;
1306         return 0;
1307 }
1308
1309
1310 static int
1311 xdr_int_decode(struct mbuf **mptr, int *iptr)
1312 {
1313         u_int32_t i;
1314         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1315                 return EBADRPC;
1316         *iptr = fxdr_unsigned(u_int32_t, i);
1317         return 0;
1318 }
1319
1320
1321 static void
1322 print_sin_addr(struct sockaddr_in *sin)
1323 {
1324         print_in_addr(sin->sin_addr);
1325 }
1326
1327
1328 static void
1329 print_in_addr(struct in_addr addr)
1330 {
1331         unsigned int ip;
1332
1333         ip = ntohl(addr.s_addr);
1334         printf("%d.%d.%d.%d",
1335                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1336 }
1337
1338 static void
1339 bootpc_compose_query(ifctx, gctx, td)
1340         struct bootpc_ifcontext *ifctx;
1341         struct bootpc_globalcontext *gctx;
1342         struct thread *td;
1343 {
1344         unsigned char *vendp;
1345         unsigned char vendor_client[64];
1346         uint32_t leasetime;
1347         uint8_t vendor_client_len;
1348
1349         ifctx->gotrootpath = 0;
1350
1351         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1352
1353         /* bootpc part */
1354         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1355         ifctx->call.htype = 1;                  /* 10mb ethernet */
1356         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1357         ifctx->call.hops = 0;
1358         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1359                 ifctx->xid++;
1360         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1361         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1362
1363         vendp = ifctx->call.vend;
1364         *vendp++ = 99;          /* RFC1048 cookie */
1365         *vendp++ = 130;
1366         *vendp++ = 83;
1367         *vendp++ = 99;
1368         *vendp++ = TAG_MAXMSGSIZE;
1369         *vendp++ = 2;
1370         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1371         *vendp++ = sizeof(struct bootp_packet) & 255;
1372
1373         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1374                 ostype, MACHINE, osrelease);
1375         vendor_client_len = strlen(vendor_client);
1376         *vendp++ = TAG_VENDOR_INDENTIFIER;
1377         *vendp++ = vendor_client_len;
1378         memcpy(vendp, vendor_client, vendor_client_len);
1379         vendp += vendor_client_len;;
1380         ifctx->dhcpquerytype = DHCP_NOMSG;
1381         switch (ifctx->state) {
1382         case IF_DHCP_UNRESOLVED:
1383                 *vendp++ = TAG_DHCP_MSGTYPE;
1384                 *vendp++ = 1;
1385                 *vendp++ = DHCP_DISCOVER;
1386                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1387                 ifctx->gotdhcpserver = 0;
1388                 break;
1389         case IF_DHCP_OFFERED:
1390                 *vendp++ = TAG_DHCP_MSGTYPE;
1391                 *vendp++ = 1;
1392                 *vendp++ = DHCP_REQUEST;
1393                 ifctx->dhcpquerytype = DHCP_REQUEST;
1394                 *vendp++ = TAG_DHCP_REQ_ADDR;
1395                 *vendp++ = 4;
1396                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1397                 vendp += 4;
1398                 if (ifctx->gotdhcpserver != 0) {
1399                         *vendp++ = TAG_DHCP_SERVERID;
1400                         *vendp++ = 4;
1401                         memcpy(vendp, &ifctx->dhcpserver, 4);
1402                         vendp += 4;
1403                 }
1404                 *vendp++ = TAG_DHCP_LEASETIME;
1405                 *vendp++ = 4;
1406                 leasetime = htonl(300);
1407                 memcpy(vendp, &leasetime, 4);
1408                 vendp += 4;
1409         default:
1410                 ;
1411         }
1412         *vendp = TAG_END;
1413
1414         ifctx->call.secs = 0;
1415         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1416 }
1417
1418
1419 static int
1420 bootpc_hascookie(struct bootp_packet *bp)
1421 {
1422         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1423                 bp->vend[2] == 83 && bp->vend[3] == 99);
1424 }
1425
1426
1427 static void
1428 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1429                   unsigned char *start,
1430                   int len,
1431                   int tag)
1432 {
1433         unsigned char *j;
1434         unsigned char *ej;
1435         unsigned char code;
1436
1437         if (tctx->badtag != 0 || tctx->badopt != 0)
1438                 return;
1439
1440         j = start;
1441         ej = j + len;
1442
1443         while (j < ej) {
1444                 code = *j++;
1445                 if (code == TAG_PAD)
1446                         continue;
1447                 if (code == TAG_END)
1448                         return;
1449                 if (j >= ej || j + *j + 1 > ej) {
1450                         tctx->badopt = 1;
1451                         return;
1452                 }
1453                 len = *j++;
1454                 if (code == tag) {
1455                         if (tctx->taglen + len > TAG_MAXLEN) {
1456                                 tctx->badtag = 1;
1457                                 return;
1458                         }
1459                         tctx->foundopt = 1;
1460                         if (len > 0)
1461                                 memcpy(tctx->buf + tctx->taglen,
1462                                        j, len);
1463                         tctx->taglen += len;
1464                 }
1465                 if (code == TAG_OVERLOAD)
1466                         tctx->overload = *j;
1467
1468                 j += len;
1469         }
1470 }
1471
1472
1473 static unsigned char *
1474 bootpc_tag(struct bootpc_tagcontext *tctx,
1475            struct bootp_packet *bp,
1476            int len,
1477            int tag)
1478 {
1479         unsigned char *j;
1480         unsigned char *ej;
1481
1482         tctx->overload = 0;
1483         tctx->badopt = 0;
1484         tctx->badtag = 0;
1485         tctx->foundopt = 0;
1486         tctx->taglen = 0;
1487
1488         if (bootpc_hascookie(bp) == 0)
1489                 return NULL;
1490
1491         j = &bp->vend[4];
1492         ej = (unsigned char *) bp + len;
1493
1494         bootpc_tag_helper(tctx, &bp->vend[4],
1495                           (unsigned char *) bp + len - &bp->vend[4], tag);
1496
1497         if ((tctx->overload & OVERLOAD_FILE) != 0)
1498                 bootpc_tag_helper(tctx,
1499                                   (unsigned char *) bp->file,
1500                                   sizeof(bp->file),
1501                                   tag);
1502         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1503                 bootpc_tag_helper(tctx,
1504                                   (unsigned char *) bp->sname,
1505                                   sizeof(bp->sname),
1506                                   tag);
1507
1508         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1509                 return NULL;
1510         tctx->buf[tctx->taglen] = '\0';
1511         return tctx->buf;
1512 }
1513
1514
1515 static void
1516 bootpc_decode_reply(nd, ifctx, gctx)
1517         struct nfsv3_diskless *nd;
1518         struct bootpc_ifcontext *ifctx;
1519         struct bootpc_globalcontext *gctx;
1520 {
1521         char *p;
1522         unsigned int ip;
1523
1524         ifctx->gotgw = 0;
1525         ifctx->gotnetmask = 0;
1526
1527         clear_sinaddr(&ifctx->myaddr);
1528         clear_sinaddr(&ifctx->netmask);
1529         clear_sinaddr(&ifctx->gw);
1530
1531         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1532
1533         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1534         snprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1535                  "swap.%d.%d.%d.%d",
1536                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1537
1538         printf("%s at ", ifctx->ireq.ifr_name);
1539         print_sin_addr(&ifctx->myaddr);
1540         printf(" server ");
1541         print_in_addr(ifctx->reply.siaddr);
1542
1543         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1544         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1545                 printf(" via gateway ");
1546                 print_in_addr(ifctx->reply.giaddr);
1547         }
1548
1549         /* This call used for the side effect (overload flag) */
1550         (void) bootpc_tag(&gctx->tmptag,
1551                           &ifctx->reply, ifctx->replylen, TAG_END);
1552
1553         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1554                 if (ifctx->reply.sname[0] != '\0')
1555                         printf(" server name %s", ifctx->reply.sname);
1556         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1557                 if (ifctx->reply.file[0] != '\0')
1558                         printf(" boot file %s", ifctx->reply.file);
1559
1560         printf("\n");
1561
1562         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1563                        TAG_SUBNETMASK);
1564         if (p != NULL) {
1565                 if (gctx->tag.taglen != 4)
1566                         panic("bootpc: subnet mask len is %d",
1567                               gctx->tag.taglen);
1568                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1569                 ifctx->gotnetmask = 1;
1570                 printf("subnet mask ");
1571                 print_sin_addr(&ifctx->netmask);
1572                 printf(" ");
1573         }
1574
1575         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1576                        TAG_ROUTERS);
1577         if (p != NULL) {
1578                 /* Routers */
1579                 if (gctx->tag.taglen % 4)
1580                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1581                 if (gctx->tag.taglen > 0) {
1582                         bcopy(p, &ifctx->gw.sin_addr, 4);
1583                         printf("router ");
1584                         print_sin_addr(&ifctx->gw);
1585                         printf(" ");
1586                         ifctx->gotgw = 1;
1587                         gctx->gotgw = 1;
1588                 }
1589         }
1590
1591         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1592                        TAG_ROOT);
1593         if (p != NULL) {
1594                 if (gctx->setrootfs != NULL) {
1595                         printf("rootfs %s (ignored) ", p);
1596                 } else  if (setfs(&nd->root_saddr,
1597                                   nd->root_hostnam, p)) {
1598                         printf("rootfs %s ",p);
1599                         gctx->gotrootpath = 1;
1600                         ifctx->gotrootpath = 1;
1601                         gctx->setrootfs = ifctx;
1602
1603                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1604                                        ifctx->replylen,
1605                                        TAG_ROOTOPTS);
1606                         if (p != NULL) {
1607                                 mountopts(&nd->root_args, p);
1608                                 printf("rootopts %s ", p);
1609                         }
1610                 } else
1611                         panic("Failed to set rootfs to %s",p);
1612         }
1613
1614         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1615                        TAG_SWAP);
1616         if (p != NULL) {
1617                 if (gctx->setswapfs != NULL) {
1618                         printf("swapfs %s (ignored) ", p);
1619                 } else  if (setfs(&nd->swap_saddr,
1620                                   nd->swap_hostnam, p)) {
1621                         gctx->gotswappath = 1;
1622                         gctx->setswapfs = ifctx;
1623                         printf("swapfs %s ", p);
1624
1625                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1626                                        ifctx->replylen,
1627                                        TAG_SWAPOPTS);
1628                         if (p != NULL) {
1629                                 /* swap mount options */
1630                                 mountopts(&nd->swap_args, p);
1631                                 printf("swapopts %s ", p);
1632                         }
1633
1634                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1635                                        ifctx->replylen,
1636                                        TAG_SWAPSIZE);
1637                         if (p != NULL) {
1638                                 int swaplen;
1639                                 if (gctx->tag.taglen != 4)
1640                                         panic("bootpc: "
1641                                               "Expected 4 bytes for swaplen, "
1642                                               "not %d bytes",
1643                                               gctx->tag.taglen);
1644                                 bcopy(p, &swaplen, 4);
1645                                 nd->swap_nblks = ntohl(swaplen);
1646                                 printf("swapsize %d KB ",
1647                                        nd->swap_nblks);
1648                         }
1649                 } else
1650                         panic("Failed to set swapfs to %s", p);
1651         }
1652
1653         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1654                        TAG_HOSTNAME);
1655         if (p != NULL) {
1656                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1657                         panic("bootpc: hostname >= %d bytes",
1658                               MAXHOSTNAMELEN);
1659                 if (gctx->sethostname != NULL) {
1660                         printf("hostname %s (ignored) ", p);
1661                 } else {
1662                         strcpy(nd->my_hostnam, p);
1663                         strcpy(hostname, p);
1664                         printf("hostname %s ",hostname);
1665                         gctx->sethostname = ifctx;
1666                 }
1667         }
1668         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1669                        TAG_COOKIE);
1670         if (p != NULL) {        /* store in a sysctl variable */
1671                 int i, l = sizeof(bootp_cookie) - 1;
1672                 for (i = 0; i < l && p[i] != '\0'; i++)
1673                         bootp_cookie[i] = p[i];
1674                 p[i] = '\0';
1675         }
1676
1677         printf("\n");
1678
1679         if (ifctx->gotnetmask == 0) {
1680                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1681                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1682                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1683                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1684                 else
1685                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1686         }
1687         if (ifctx->gotgw == 0) {
1688                 /* Use proxyarp */
1689                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1690         }
1691 }
1692
1693 void
1694 bootpc_init(void)
1695 {
1696         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1697         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1698         struct ifnet *ifp;
1699         int error;
1700         struct nfsv3_diskless *nd;
1701         struct thread *td;
1702
1703         nd = &nfsv3_diskless;
1704         td = curthread;
1705
1706         /*
1707          * If already filled in, don't touch it here
1708          */
1709         if (nfs_diskless_valid != 0)
1710                 return;
1711
1712         /*
1713          * Wait until arp entries can be handled.
1714          */
1715         while (time_second == 0)
1716                 tsleep(&time_second, 0, "arpkludge", 10);
1717
1718         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK);
1719         if (gctx == NULL)
1720                 panic("Failed to allocate bootp global context structure");
1721
1722         bzero(gctx, sizeof(*gctx));
1723         gctx->xid = ~0xFFFF;
1724         gctx->starttime = time_second;
1725
1726         ifctx = allocifctx(gctx);
1727
1728         /*
1729          * Find a network interface.
1730          */
1731 #ifdef BOOTP_WIRED_TO
1732         printf("bootpc_init: wired to interface '%s'\n",
1733                __XSTRING(BOOTP_WIRED_TO));
1734 #endif
1735         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1736         for (ifp = TAILQ_FIRST(&ifnet);
1737              ifp != NULL;
1738              ifp = TAILQ_NEXT(ifp, if_link)) {
1739                 snprintf(ifctx->ireq.ifr_name, sizeof(ifctx->ireq.ifr_name),
1740                          "%s%d", ifp->if_name, ifp->if_unit);
1741 #ifdef BOOTP_WIRED_TO
1742                 if (strcmp(ifctx->ireq.ifr_name,
1743                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1744                         continue;
1745 #else
1746                 if ((ifp->if_flags &
1747                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1748                     IFF_BROADCAST)
1749                         continue;
1750 #endif
1751                 if (gctx->interfaces != NULL)
1752                         gctx->lastinterface->next = ifctx;
1753                 else
1754                         gctx->interfaces = ifctx;
1755                 ifctx->ifp = ifp;
1756                 gctx->lastinterface = ifctx;
1757                 ifctx = allocifctx(gctx);
1758         }
1759         free(ifctx, M_TEMP);
1760
1761         if (gctx->interfaces == NULL) {
1762 #ifdef BOOTP_WIRED_TO
1763                 panic("bootpc_init: Could not find interface specified "
1764                       "by BOOTP_WIRED_TO: "
1765                       __XSTRING(BOOTP_WIRED_TO));
1766 #else
1767                 panic("bootpc_init: no suitable interface");
1768 #endif
1769         }
1770
1771         gctx->gotrootpath = 0;
1772         gctx->gotswappath = 0;
1773         gctx->gotgw = 0;
1774
1775         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1776                 bootpc_fakeup_interface(ifctx, gctx, td);
1777
1778         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1779                 bootpc_compose_query(ifctx, gctx, td);
1780
1781         ifctx = gctx->interfaces;
1782         error = bootpc_call(gctx, td);
1783
1784         if (error != 0) {
1785 #ifdef BOOTP_NFSROOT
1786                 panic("BOOTP call failed");
1787 #else
1788                 printf("BOOTP call failed\n");
1789 #endif
1790         }
1791
1792         mountopts(&nd->root_args, NULL);
1793
1794         mountopts(&nd->swap_args, NULL);
1795
1796         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1797                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1798                         bootpc_decode_reply(nd, ifctx, gctx);
1799
1800         if (gctx->gotswappath == 0)
1801                 nd->swap_nblks = 0;
1802 #ifdef BOOTP_NFSROOT
1803         if (gctx->gotrootpath == 0)
1804                 panic("bootpc: No root path offered");
1805 #endif
1806
1807         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1808                 bootpc_adjust_interface(ifctx, gctx, td);
1809
1810                 soclose(ifctx->so);
1811         }
1812
1813         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1814                 if (ifctx->gotrootpath != 0)
1815                         break;
1816         if (ifctx == NULL) {
1817                 for (ifctx = gctx->interfaces;
1818                      ifctx != NULL;
1819                      ifctx = ifctx->next)
1820                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1821                                 break;
1822         }
1823         if (ifctx == NULL)
1824                 goto out;
1825
1826         if (gctx->gotrootpath != 0) {
1827
1828                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1829                                  nd->root_fh, &nd->root_fhsize,
1830                                  &nd->root_args, td);
1831                 if (error != 0)
1832                         panic("nfs_boot: mountd root, error=%d", error);
1833
1834                 if (gctx->gotswappath != 0) {
1835
1836                         error = md_mount(&nd->swap_saddr,
1837                                          nd->swap_hostnam,
1838                                          nd->swap_fh, &nd->swap_fhsize,
1839                                          &nd->swap_args, td);
1840                         if (error != 0)
1841                                 panic("nfs_boot: mountd swap, error=%d",
1842                                       error);
1843
1844                         error = md_lookup_swap(&nd->swap_saddr,
1845                                                gctx->lookup_path,
1846                                                nd->swap_fh, &nd->swap_fhsize,
1847                                                &nd->swap_args, td);
1848                         if (error != 0)
1849                                 panic("nfs_boot: lookup swap, error=%d",
1850                                       error);
1851                 }
1852                 nfs_diskless_valid = 3;
1853         }
1854
1855         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1856         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1857         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1858         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1859                 ifctx->myaddr.sin_addr.s_addr |
1860                 ~ ifctx->netmask.sin_addr.s_addr;
1861         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1862
1863 out:
1864         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1865                 nctx = ifctx->next;
1866                 free(ifctx, M_TEMP);
1867         }
1868         free(gctx, M_TEMP);
1869 }
1870
1871
1872 /*
1873  * RPC: mountd/mount
1874  * Given a server pathname, get an NFS file handle.
1875  * Also, sets sin->sin_port to the NFS service port.
1876  */
1877 static int
1878 md_mount(struct sockaddr_in *mdsin,             /* mountd server address */
1879          char *path,
1880          u_char *fhp,
1881          int *fhsizep,
1882          struct nfs_args *args,
1883          struct thread *td)
1884 {
1885         struct mbuf *m;
1886         int error;
1887         int authunixok;
1888         int authcount;
1889         int authver;
1890
1891 #ifdef BOOTP_NFSV3
1892         /* First try NFS v3 */
1893         /* Get port number for MOUNTD. */
1894         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1895                              &mdsin->sin_port, td);
1896         if (error == 0) {
1897                 m = xdr_string_encode(path, strlen(path));
1898
1899                 /* Do RPC to mountd. */
1900                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1901                                   RPCMNT_MOUNT, &m, NULL, td);
1902         }
1903         if (error == 0) {
1904                 args->flags |= NFSMNT_NFSV3;
1905         } else {
1906 #endif
1907                 /* Fallback to NFS v2 */
1908
1909                 /* Get port number for MOUNTD. */
1910                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1911                                      &mdsin->sin_port, td);
1912                 if (error != 0)
1913                         return error;
1914
1915                 m = xdr_string_encode(path, strlen(path));
1916
1917                 /* Do RPC to mountd. */
1918                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1919                                   RPCMNT_MOUNT, &m, NULL, td);
1920                 if (error != 0)
1921                         return error;   /* message already freed */
1922
1923 #ifdef BOOTP_NFSV3
1924         }
1925 #endif
1926
1927         if (xdr_int_decode(&m, &error) != 0 || error != 0)
1928                 goto bad;
1929
1930         if ((args->flags & NFSMNT_NFSV3) != 0) {
1931                 if (xdr_int_decode(&m, fhsizep) != 0 ||
1932                     *fhsizep > NFSX_V3FHMAX ||
1933                     *fhsizep <= 0)
1934                         goto bad;
1935         } else
1936                 *fhsizep = NFSX_V2FH;
1937
1938         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1939                 goto bad;
1940
1941         if (args->flags & NFSMNT_NFSV3) {
1942                 if (xdr_int_decode(&m, &authcount) != 0)
1943                         goto bad;
1944                 authunixok = 0;
1945                 if (authcount < 0 || authcount > 100)
1946                         goto bad;
1947                 while (authcount > 0) {
1948                         if (xdr_int_decode(&m, &authver) != 0)
1949                                 goto bad;
1950                         if (authver == RPCAUTH_UNIX)
1951                                 authunixok = 1;
1952                         authcount--;
1953                 }
1954                 if (authunixok == 0)
1955                         goto bad;
1956         }
1957
1958         /* Set port number for NFS use. */
1959         error = krpc_portmap(mdsin, NFS_PROG,
1960                              (args->flags &
1961                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1962                              &mdsin->sin_port, td);
1963
1964         goto out;
1965
1966 bad:
1967         error = EBADRPC;
1968
1969 out:
1970         m_freem(m);
1971         return error;
1972 }
1973
1974
1975 static int
1976 md_lookup_swap(struct sockaddr_in *mdsin,       /* mountd server address */
1977                char *path,
1978                u_char *fhp,
1979                int *fhsizep,
1980                struct nfs_args *args,
1981                struct thread *td)
1982 {
1983         struct mbuf *m;
1984         int error;
1985         int size = -1;
1986         int attribs_present;
1987         int status;
1988         union {
1989                 u_int32_t v2[17];
1990                 u_int32_t v3[21];
1991         } fattribs;
1992
1993         m = m_get(M_WAIT,MT_DATA);
1994         if (m == NULL)
1995                 return ENOBUFS;
1996
1997         if ((args->flags & NFSMNT_NFSV3) != 0) {
1998                 *mtod(m, u_int32_t *) = txdr_unsigned(*fhsizep);
1999                 bcopy(fhp, mtod(m, u_char *) + sizeof(u_int32_t), *fhsizep);
2000                 m->m_len = *fhsizep + sizeof(u_int32_t);
2001         } else {
2002                 bcopy(fhp, mtod(m, u_char *), NFSX_V2FH);
2003                 m->m_len = NFSX_V2FH;
2004         }
2005
2006         m->m_next = xdr_string_encode(path, strlen(path));
2007         if (m->m_next == NULL) {
2008                 error = ENOBUFS;
2009                 goto out;
2010         }
2011
2012         /* Do RPC to nfsd. */
2013         if ((args->flags & NFSMNT_NFSV3) != 0)
2014                 error = krpc_call(mdsin, NFS_PROG, NFS_VER3,
2015                                   NFSPROC_LOOKUP, &m, NULL, td);
2016         else
2017                 error = krpc_call(mdsin, NFS_PROG, NFS_VER2,
2018                                   NFSV2PROC_LOOKUP, &m, NULL, td);
2019         if (error != 0)
2020                 return error;   /* message already freed */
2021
2022         if (xdr_int_decode(&m, &status) != 0)
2023                 goto bad;
2024         if (status != 0) {
2025                 error = ENOENT;
2026                 goto out;
2027         }
2028
2029         if ((args->flags & NFSMNT_NFSV3) != 0) {
2030                 if (xdr_int_decode(&m, fhsizep) != 0 ||
2031                     *fhsizep > NFSX_V3FHMAX ||
2032                     *fhsizep <= 0)
2033                         goto bad;
2034         } else
2035                 *fhsizep = NFSX_V2FH;
2036
2037         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
2038                 goto bad;
2039
2040         if ((args->flags & NFSMNT_NFSV3) != 0) {
2041                 if (xdr_int_decode(&m, &attribs_present) != 0)
2042                         goto bad;
2043                 if (attribs_present != 0) {
2044                         if (xdr_opaque_decode(&m, (u_char *) &fattribs.v3,
2045                                               sizeof(u_int32_t) * 21) != 0)
2046                                 goto bad;
2047                         size = fxdr_unsigned(u_int32_t, fattribs.v3[6]);
2048                 }
2049         } else {
2050                 if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2,
2051                                       sizeof(u_int32_t) * 17) != 0)
2052                         goto bad;
2053                 size = fxdr_unsigned(u_int32_t, fattribs.v2[5]);
2054         }
2055
2056         if (nfsv3_diskless.swap_nblks == 0 && size != -1) {
2057                 nfsv3_diskless.swap_nblks = size / 1024;
2058                 printf("md_lookup_swap: Swap size is %d KB\n",
2059                        nfsv3_diskless.swap_nblks);
2060         }
2061
2062         goto out;
2063
2064 bad:
2065         error = EBADRPC;
2066
2067 out:
2068         m_freem(m);
2069         return error;
2070 }