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 1.6 2004/01/06 03:21:18 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 "rpcv2.h"
  69 #include "nfsproto.h"
  70 #include "nfs.h"
  71 #include "nfsdiskless.h"
  72 #include "krpc.h"
  73 #include "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\n", if_name(rt->rt_ifp));
 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 flags %x, addr ",
 396                if_name(ifp),
 397                (unsigned short) ifp->if_flags);
 398         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
 399         printf(", broadcast ");
 400         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
 401         printf(", netmask ");
 402         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
 403         printf("\n");
 404 }
 405
 406
 407 void
 408 bootpboot_p_iflist(void)
 409 {
 410         struct ifnet *ifp;
 411         struct ifaddr *ifa;
 412
 413         printf("Interface list:\n");
 414         for (ifp = TAILQ_FIRST(&ifnet);
 415              ifp != NULL;
 416              ifp = TAILQ_NEXT(ifp, if_link)) {
 417                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
 418                      ifa != NULL;
 419                      ifa = TAILQ_NEXT(ifa, ifa_link))
 420                         if (ifa->ifa_addr->sa_family == AF_INET)
 421                                 bootpboot_p_if(ifp, ifa);
 422         }
 423 }
 424 #endif /* defined(BOOTP_DEBUG) */
 425
 426
 427 static void
 428 clear_sinaddr(struct sockaddr_in *sin)
 429 {
 430         bzero(sin, sizeof(*sin));
 431         sin->sin_len = sizeof(*sin);
 432         sin->sin_family = AF_INET;
 433         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
 434         sin->sin_port = 0;
 435 }
 436
 437
 438 static struct bootpc_ifcontext *
 439 allocifctx(struct bootpc_globalcontext *gctx)
 440 {
 441         struct bootpc_ifcontext *ifctx;
 442         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
 443                                                    M_TEMP, M_WAITOK);
 444         if (ifctx == NULL)
 445                 panic("Failed to allocate bootp interface context structure");
 446
 447         bzero(ifctx, sizeof(*ifctx));
 448         ifctx->xid = gctx->xid;
 449 #ifdef BOOTP_NO_DHCP
 450         ifctx->state = IF_BOOTP_UNRESOLVED;
 451 #else
 452         ifctx->state = IF_DHCP_UNRESOLVED;
 453 #endif
 454         gctx->xid += 0x100;
 455         return ifctx;
 456 }
 457
 458
 459 static __inline int
 460 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
 461 {
 462         if (ifctx->state == IF_BOOTP_RESOLVED ||
 463             ifctx->state == IF_DHCP_RESOLVED)
 464                 return 1;
 465         return 0;
 466 }
 467
 468
 469 static __inline int
 470 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
 471 {
 472         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
 473             ifctx->state == IF_DHCP_UNRESOLVED)
 474                 return 1;
 475         return 0;
 476 }
 477
 478
 479 static __inline int
 480 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
 481 {
 482         if (ifctx->state == IF_BOOTP_FAILED ||
 483             ifctx->state == IF_DHCP_FAILED)
 484                 return 1;
 485         return 0;
 486 }
 487
 488
 489 static int
 490 bootpc_received(struct bootpc_globalcontext *gctx,
 491                 struct bootpc_ifcontext *ifctx)
 492 {
 493         unsigned char dhcpreplytype;
 494         char *p;
 495         /*
 496          * Need timeout for fallback to less
 497          * desirable alternative.
 498          */
 499
 500
 501         /* This call used for the side effect (badopt flag) */
 502         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
 503                           gctx->replylen,
 504                           TAG_END);
 505
 506         /* If packet is invalid, ignore it */
 507         if (gctx->tmptag.badopt != 0)
 508                 return 0;
 509
 510         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
 511                        gctx->replylen, TAG_DHCP_MSGTYPE);
 512         if (p != NULL)
 513                 dhcpreplytype = *p;
 514         else
 515                 dhcpreplytype = DHCP_NOMSG;
 516
 517         switch (ifctx->dhcpquerytype) {
 518         case DHCP_DISCOVER:
 519                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
 520 #ifndef BOOTP_FORCE_DHCP
 521                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
 522 #endif
 523                         )
 524                         return 0;
 525                 break;
 526         case DHCP_REQUEST:
 527                 if (dhcpreplytype != DHCP_ACK)
 528                         return 0;
 529         case DHCP_NOMSG:
 530         }
 531
 532
 533         /* Ignore packet unless it gives us a root tag we didn't have */
 534
 535         if ((ifctx->state == IF_BOOTP_RESOLVED ||
 536              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 537               (ifctx->state == IF_DHCP_OFFERED ||
 538                ifctx->state == IF_DHCP_RESOLVED))) &&
 539             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 540                         ifctx->replylen,
 541                         TAG_ROOT) != NULL ||
 542              bootpc_tag(&gctx->tmptag, &gctx->reply,
 543                         gctx->replylen,
 544                         TAG_ROOT) == NULL))
 545                 return 0;
 546
 547         bcopy(&gctx->reply,
 548               &ifctx->reply,
 549               gctx->replylen);
 550         ifctx->replylen = gctx->replylen;
 551
 552         /* XXX: Only reset if 'perfect' response */
 553         if (ifctx->state == IF_BOOTP_UNRESOLVED)
 554                 ifctx->state = IF_BOOTP_RESOLVED;
 555         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
 556                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
 557                 if (dhcpreplytype == DHCP_OFFER)
 558                         ifctx->state = IF_DHCP_OFFERED;
 559                 else
 560                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
 561         } else if (ifctx->state == IF_DHCP_OFFERED &&
 562                    ifctx->dhcpquerytype == DHCP_REQUEST)
 563                 ifctx->state = IF_DHCP_RESOLVED;
 564
 565
 566         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 567             ifctx->state != IF_BOOTP_RESOLVED) {
 568                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
 569                                ifctx->replylen, TAG_DHCP_SERVERID);
 570                 if (p != NULL && gctx->tmptag.taglen == 4) {
 571                         memcpy(&ifctx->dhcpserver, p, 4);
 572                         ifctx->gotdhcpserver = 1;
 573                 } else
 574                         ifctx->gotdhcpserver = 0;
 575                 return 1;
 576         }
 577
 578         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 579                                          ifctx->replylen,
 580                                          TAG_ROOT) != NULL);
 581         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 582                                    ifctx->replylen,
 583                                    TAG_ROUTERS) != NULL);
 584         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 585                                         ifctx->replylen,
 586                                         TAG_SUBNETMASK) != NULL);
 587         return 1;
 588 }
 589
 590 static int
 591 bootpc_call(struct bootpc_globalcontext *gctx,
 592             struct thread *td)
 593 {
 594         struct socket *so;
 595         struct sockaddr_in *sin, dst;
 596         struct uio auio;
 597         struct sockopt sopt;
 598         struct iovec aio;
 599         int error, on, rcvflg, timo, len;
 600         time_t atimo;
 601         time_t rtimo;
 602         struct timeval tv;
 603         struct bootpc_ifcontext *ifctx;
 604         int outstanding;
 605         int gotrootpath;
 606         int retry;
 607         const char *s;
 608
 609         /*
 610          * Create socket and set its recieve timeout.
 611          */
 612         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
 613         if (error != 0)
 614                 goto out;
 615
 616         tv.tv_sec = 1;
 617         tv.tv_usec = 0;
 618         bzero(&sopt, sizeof(sopt));
 619         sopt.sopt_level = SOL_SOCKET;
 620         sopt.sopt_name = SO_RCVTIMEO;
 621         sopt.sopt_val = &tv;
 622         sopt.sopt_valsize = sizeof tv;
 623
 624         error = sosetopt(so, &sopt);
 625         if (error != 0)
 626                 goto out;
 627
 628         /*
 629          * Enable broadcast.
 630          */
 631         on = 1;
 632         sopt.sopt_name = SO_BROADCAST;
 633         sopt.sopt_val = &on;
 634         sopt.sopt_valsize = sizeof on;
 635
 636         error = sosetopt(so, &sopt);
 637         if (error != 0)
 638                 goto out;
 639
 640         /*
 641          * Disable routing.
 642          */
 643
 644         on = 1;
 645         sopt.sopt_name = SO_DONTROUTE;
 646         sopt.sopt_val = &on;
 647         sopt.sopt_valsize = sizeof on;
 648
 649         error = sosetopt(so, &sopt);
 650         if (error != 0)
 651                 goto out;
 652
 653         /*
 654          * Bind the local endpoint to a bootp client port.
 655          */
 656         sin = &dst;
 657         clear_sinaddr(sin);
 658         sin->sin_port = htons(IPPORT_BOOTPC);
 659         error = sobind(so, (struct sockaddr *)sin, td);
 660         if (error != 0) {
 661                 printf("bind failed\n");
 662                 goto out;
 663         }
 664
 665         /*
 666          * Setup socket address for the server.
 667          */
 668         sin = &dst;
 669         clear_sinaddr(sin);
 670         sin->sin_addr.s_addr = INADDR_BROADCAST;
 671         sin->sin_port = htons(IPPORT_BOOTPS);
 672
 673         /*
 674          * Send it, repeatedly, until a reply is received,
 675          * but delay each re-send by an increasing amount.
 676          * If the delay hits the maximum, start complaining.
 677          */
 678         timo = 0;
 679         rtimo = 0;
 680         for (;;) {
 681
 682                 outstanding = 0;
 683                 gotrootpath = 0;
 684
 685                 for (ifctx = gctx->interfaces;
 686                      ifctx != NULL;
 687                      ifctx = ifctx->next) {
 688                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 689                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 690                                        ifctx->replylen,
 691                                        TAG_ROOT) != NULL)
 692                                 gotrootpath = 1;
 693                 }
 694
 695                 for (ifctx = gctx->interfaces;
 696                      ifctx != NULL;
 697                      ifctx = ifctx->next) {
 698                         ifctx->outstanding = 0;
 699                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 700                             gotrootpath != 0) {
 701                                 continue;
 702                         }
 703                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 704                                 continue;
 705
 706                         outstanding++;
 707                         ifctx->outstanding = 1;
 708
 709                         /* Proceed to next step in DHCP negotiation */
 710                         if ((ifctx->state == IF_DHCP_OFFERED &&
 711                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 712                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 713                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 714                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 715                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 716                                 ifctx->sentmsg = 0;
 717                                 bootpc_compose_query(ifctx, gctx, td);
 718                         }
 719
 720                         /* Send BOOTP request (or re-send). */
 721
 722                         if (ifctx->sentmsg == 0) {
 723                                 switch(ifctx->dhcpquerytype) {
 724                                 case DHCP_DISCOVER:
 725                                         s = "DHCP Discover";
 726                                         break;
 727                                 case DHCP_REQUEST:
 728                                         s = "DHCP Request";
 729                                         break;
 730                                 case DHCP_NOMSG:
 731                                 default:
 732                                         s = "BOOTP Query";
 733                                         break;
 734                                 }
 735                                 printf("Sending %s packet from "
 736                                        "interface %s (%*D)\n",
 737                                        s,
 738                                        ifctx->ireq.ifr_name,
 739                                        ifctx->sdl->sdl_alen,
 740                                        (unsigned char *) LLADDR(ifctx->sdl),
 741                                        ":");
 742                                 ifctx->sentmsg = 1;
 743                         }
 744
 745                         aio.iov_base = (caddr_t) &ifctx->call;
 746                         aio.iov_len = sizeof(ifctx->call);
 747
 748                         auio.uio_iov = &aio;
 749                         auio.uio_iovcnt = 1;
 750                         auio.uio_segflg = UIO_SYSSPACE;
 751                         auio.uio_rw = UIO_WRITE;
 752                         auio.uio_offset = 0;
 753                         auio.uio_resid = sizeof(ifctx->call);
 754                         auio.uio_td = td;
 755
 756                         /* Set netmask to 0.0.0.0 */
 757
 758                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 759                         clear_sinaddr(sin);
 760                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 761                                         (caddr_t) &ifctx->ireq, td);
 762                         if (error != 0)
 763                                 panic("bootpc_call:"
 764                                       "set if netmask, error=%d",
 765                                       error);
 766
 767                         error = sosend(so, (struct sockaddr *) &dst,
 768                                        &auio, NULL, NULL, 0, td);
 769                         if (error != 0) {
 770                                 printf("bootpc_call: sosend: %d state %08x\n",
 771                                        error, (int) so->so_state);
 772                         }
 773
 774                         /* XXX: Is this needed ? */
 775                         tsleep(&error, 0, "bootpw", 10);
 776
 777                         /* Set netmask to 255.0.0.0 */
 778
 779                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 780                         clear_sinaddr(sin);
 781                         sin->sin_addr.s_addr = htonl(0xff000000u);
 782                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 783                                         (caddr_t) &ifctx->ireq, td);
 784                         if (error != 0)
 785                                 panic("bootpc_call:"
 786                                       "set if netmask, error=%d",
 787                                       error);
 788
 789                 }
 790
 791                 if (outstanding == 0 &&
 792                     (rtimo == 0 || time_second >= rtimo)) {
 793                         error = 0;
 794                         goto gotreply;
 795                 }
 796
 797                 /* Determine new timeout. */
 798                 if (timo < MAX_RESEND_DELAY)
 799                         timo++;
 800                 else {
 801                         printf("DHCP/BOOTP timeout for server ");
 802                         print_sin_addr(&dst);
 803                         printf("\n");
 804                 }
 805
 806                 /*
 807                  * Wait for up to timo seconds for a reply.
 808                  * The socket receive timeout was set to 1 second.
 809                  */
 810                 atimo = timo + time_second;
 811                 while (time_second < atimo) {
 812                         aio.iov_base = (caddr_t) &gctx->reply;
 813                         aio.iov_len = sizeof(gctx->reply);
 814
 815                         auio.uio_iov = &aio;
 816                         auio.uio_iovcnt = 1;
 817                         auio.uio_segflg = UIO_SYSSPACE;
 818                         auio.uio_rw = UIO_READ;
 819                         auio.uio_offset = 0;
 820                         auio.uio_resid = sizeof(gctx->reply);
 821                         auio.uio_td = td;
 822
 823                         rcvflg = 0;
 824                         error = soreceive(so, NULL, &auio,
 825                                           NULL, NULL, &rcvflg);
 826                         gctx->secs = time_second - gctx->starttime;
 827                         for (ifctx = gctx->interfaces;
 828                              ifctx != NULL;
 829                              ifctx = ifctx->next) {
 830                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 831                                     bootpc_ifctx_isfailed(ifctx) != 0)
 832                                         continue;
 833
 834                                 ifctx->call.secs = htons(gctx->secs);
 835                         }
 836                         if (error == EWOULDBLOCK)
 837                                 continue;
 838                         if (error != 0)
 839                                 goto out;
 840                         len = sizeof(gctx->reply) - auio.uio_resid;
 841
 842                         /* Do we have the required number of bytes ? */
 843                         if (len < BOOTP_MIN_LEN)
 844                                 continue;
 845                         gctx->replylen = len;
 846
 847                         /* Is it a reply? */
 848                         if (gctx->reply.op != BOOTP_REPLY)
 849                                 continue;
 850
 851                         /* Is this an answer to our query */
 852                         for (ifctx = gctx->interfaces;
 853                              ifctx != NULL;
 854                              ifctx = ifctx->next) {
 855                                 if (gctx->reply.xid != ifctx->call.xid)
 856                                         continue;
 857
 858                                 /* Same HW address size ? */
 859                                 if (gctx->reply.hlen != ifctx->call.hlen)
 860                                         continue;
 861
 862                                 /* Correct HW address ? */
 863                                 if (bcmp(gctx->reply.chaddr,
 864                                          ifctx->call.chaddr,
 865                                          ifctx->call.hlen) != 0)
 866                                         continue;
 867
 868                                 break;
 869                         }
 870
 871                         if (ifctx != NULL) {
 872                                 s =  bootpc_tag(&gctx->tmptag,
 873                                                 &gctx->reply,
 874                                                 gctx->replylen,
 875                                                 TAG_DHCP_MSGTYPE);
 876                                 if (s != NULL) {
 877                                         switch (*s) {
 878                                         case DHCP_OFFER:
 879                                                 s = "DHCP Offer";
 880                                                 break;
 881                                         case DHCP_ACK:
 882                                                 s = "DHCP Ack";
 883                                                 break;
 884                                         default:
 885                                                 s = "DHCP (unexpected)";
 886                                                 break;
 887                                         }
 888                                 } else
 889                                         s = "BOOTP Reply";
 890
 891                                 printf("Received %s packet"
 892                                        " on %s from ",
 893                                        s,
 894                                        ifctx->ireq.ifr_name);
 895                                 print_in_addr(gctx->reply.siaddr);
 896                                 if (gctx->reply.giaddr.s_addr !=
 897                                     htonl(INADDR_ANY)) {
 898                                         printf(" via ");
 899                                         print_in_addr(gctx->reply.giaddr);
 900                                 }
 901                                 if (bootpc_received(gctx, ifctx) != 0) {
 902                                         printf(" (accepted)");
 903                                         if (ifctx->outstanding) {
 904                                                 ifctx->outstanding = 0;
 905                                                 outstanding--;
 906                                         }
 907                                         /* Network settle delay */
 908                                         if (outstanding == 0)
 909                                                 atimo = time_second +
 910                                                         BOOTP_SETTLE_DELAY;
 911                                 } else
 912                                         printf(" (ignored)");
 913                                 if (ifctx->gotrootpath) {
 914                                         gotrootpath = 1;
 915                                         rtimo = time_second +
 916                                                 BOOTP_SETTLE_DELAY;
 917                                         printf(" (got root path)");
 918                                 } else
 919                                         printf(" (no root path)");
 920                                 printf("\n");
 921                         }
 922                 } /* while secs */
 923 #ifdef BOOTP_TIMEOUT
 924                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 925                         break;
 926 #endif
 927                 /* Force a retry if halfway in DHCP negotiation */
 928                 retry = 0;
 929                 for (ifctx = gctx->interfaces; ifctx != NULL;
 930                      ifctx = ifctx->next) {
 931                         if (ifctx->state == IF_DHCP_OFFERED) {
 932                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 933                                         retry = 1;
 934                                 else
 935                                         ifctx->state = IF_DHCP_UNRESOLVED;
 936                         }
 937                 }
 938
 939                 if (retry != 0)
 940                         continue;
 941
 942                 if (gotrootpath != 0) {
 943                         gctx->gotrootpath = gotrootpath;
 944                         if (rtimo != 0 && time_second >= rtimo)
 945                                 break;
 946                 }
 947         } /* forever send/receive */
 948
 949         /*
 950          * XXX: These are errors of varying seriousness being silently
 951          * ignored
 952          */
 953
 954         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 955                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 956                         printf("%s timeout for interface %s\n",
 957                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 958                                "DHCP" : "BOOTP",
 959                                ifctx->ireq.ifr_name);
 960                 }
 961         }
 962         if (gctx->gotrootpath != 0) {
 963 #if 0
 964                 printf("Got a root path, ignoring remaining timeout\n");
 965 #endif
 966                 error = 0;
 967                 goto out;
 968         }
 969 #ifndef BOOTP_NFSROOT
 970         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 971                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 972                         error = 0;
 973                         goto out;
 974                 }
 975         }
 976 #endif
 977         error = ETIMEDOUT;
 978         goto out;
 979
 980 gotreply:
 981 out:
 982         soclose(so);
 983         return error;
 984 }
 985
 986
 987 static int
 988 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 989                         struct bootpc_globalcontext *gctx,
 990                         struct thread *td)
 991 {
 992         struct sockaddr_in *sin;
 993         int error;
 994
 995         struct ifreq *ireq;
 996         struct socket *so;
 997         struct ifaddr *ifa;
 998         struct sockaddr_dl *sdl;
 999
1000         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
1001         if (error != 0)
1002                 panic("nfs_boot: socreate, error=%d", error);
1003
1004         ireq = &ifctx->ireq;
1005         so = ifctx->so;
1006
1007         /*
1008          * Bring up the interface.
1009          *
1010          * Get the old interface flags and or IFF_UP into them; if
1011          * IFF_UP set blindly, interface selection can be clobbered.
1012          */
1013         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1014         if (error != 0)
1015                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
1016         ireq->ifr_flags |= IFF_UP;
1017         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1018         if (error != 0)
1019                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1020
1021         /*
1022          * Do enough of ifconfig(8) so that the chosen interface
1023          * can talk to the servers.  (just set the address)
1024          */
1025
1026         /* addr is 0.0.0.0 */
1027
1028         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1029         clear_sinaddr(sin);
1030         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1031         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1032                 panic("bootpc_fakeup_interface: "
1033                       "set if addr, error=%d", error);
1034
1035         /* netmask is 255.0.0.0 */
1036
1037         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1038         clear_sinaddr(sin);
1039         sin->sin_addr.s_addr = htonl(0xff000000u);
1040         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
1041         if (error != 0)
1042                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1043                       error);
1044
1045         /* Broadcast is 255.255.255.255 */
1046
1047         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1048         clear_sinaddr(sin);
1049         clear_sinaddr(&ifctx->broadcast);
1050         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1051         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1052
1053         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
1054         if (error != 0 && error != EADDRNOTAVAIL)
1055                 panic("bootpc_fakeup_interface: "
1056                       "set if broadcast addr, error=%d",
1057                       error);
1058         error = 0;
1059
1060         /* Get HW address */
1061
1062         sdl = NULL;
1063         for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
1064              ifa != NULL;
1065              ifa = TAILQ_NEXT(ifa,ifa_link))
1066                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1067                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1068                     sdl->sdl_type == IFT_ETHER)
1069                         break;
1070
1071         if (sdl == NULL)
1072                 panic("bootpc: Unable to find HW address for %s",
1073                       ifctx->ireq.ifr_name);
1074         ifctx->sdl = sdl;
1075
1076         return error;
1077 }
1078
1079
1080 static int
1081 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1082                         struct bootpc_globalcontext *gctx,
1083                         struct thread *td)
1084 {
1085         int error;
1086         struct sockaddr_in defdst;
1087         struct sockaddr_in defmask;
1088         struct sockaddr_in *sin;
1089
1090         struct ifreq *ireq;
1091         struct socket *so;
1092         struct sockaddr_in *myaddr;
1093         struct sockaddr_in *netmask;
1094         struct sockaddr_in *gw;
1095
1096         ireq = &ifctx->ireq;
1097         so = ifctx->so;
1098         myaddr = &ifctx->myaddr;
1099         netmask = &ifctx->netmask;
1100         gw = &ifctx->gw;
1101
1102         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1103
1104                 /* Shutdown interfaces where BOOTP failed */
1105
1106                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1107                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
1108                 if (error != 0)
1109                         panic("bootpc_adjust_interface: "
1110                               "SIOCGIFFLAGS, error=%d", error);
1111                 ireq->ifr_flags &= ~IFF_UP;
1112                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
1113                 if (error != 0)
1114                         panic("bootpc_adjust_interface: "
1115                               "SIOCSIFFLAGS, error=%d", error);
1116
1117                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1118                 clear_sinaddr(sin);
1119                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
1120                 if (error != 0 && (error != EADDRNOTAVAIL ||
1121                                    ifctx == gctx->interfaces))
1122                         panic("bootpc_adjust_interface: "
1123                               "SIOCDIFADDR, error=%d", error);
1124
1125                 return 0;
1126         }
1127
1128         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1129         /*
1130          * Do enough of ifconfig(8) so that the chosen interface
1131          * can talk to the servers.  (just set the address)
1132          */
1133         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1134         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
1135         if (error != 0)
1136                 panic("bootpc_adjust_interface: "
1137                       "set if netmask, error=%d", error);
1138
1139         /* Broadcast is with host part of IP address all 1's */
1140
1141         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1142         clear_sinaddr(sin);
1143         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1144                 ~ netmask->sin_addr.s_addr;
1145         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
1146         if (error != 0)
1147                 panic("bootpc_adjust_interface: "
1148                       "set if broadcast addr, error=%d", error);
1149
1150         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1151         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
1152         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1153                 panic("bootpc_adjust_interface: "
1154                       "set if addr, error=%d", error);
1155
1156         /* Add new default route */
1157
1158         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1159                 clear_sinaddr(&defdst);
1160                 clear_sinaddr(&defmask);
1161                 error = rtrequest(RTM_ADD,
1162                                   (struct sockaddr *) &defdst,
1163                                   (struct sockaddr *) gw,
1164                                   (struct sockaddr *) &defmask,
1165                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
1166                 if (error != 0) {
1167                         printf("bootpc_adjust_interface: "
1168                                "add net route, error=%d\n", error);
1169                         return error;
1170                 }
1171         }
1172
1173         return 0;
1174 }
1175
1176
1177 static int
1178 setfs(struct sockaddr_in *addr, char *path, char *p)
1179 {
1180         unsigned int ip;
1181         int val;
1182
1183         ip = 0;
1184         if (((val = getdec(&p)) < 0) || (val > 255))
1185                 return 0;
1186         ip = val << 24;
1187         if (*p != '.')
1188                 return 0;
1189         p++;
1190         if (((val = getdec(&p)) < 0) || (val > 255))
1191                 return 0;
1192         ip |= (val << 16);
1193         if (*p != '.')
1194                 return 0;
1195         p++;
1196         if (((val = getdec(&p)) < 0) || (val > 255))
1197                 return 0;
1198         ip |= (val << 8);
1199         if (*p != '.')
1200                 return 0;
1201         p++;
1202         if (((val = getdec(&p)) < 0) || (val > 255))
1203                 return 0;
1204         ip |= val;
1205         if (*p != ':')
1206                 return 0;
1207         p++;
1208
1209         addr->sin_addr.s_addr = htonl(ip);
1210         addr->sin_len = sizeof(struct sockaddr_in);
1211         addr->sin_family = AF_INET;
1212
1213         strncpy(path, p, MNAMELEN - 1);
1214         return 1;
1215 }
1216
1217
1218 static int
1219 getdec(char **ptr)
1220 {
1221         char *p;
1222         int ret;
1223
1224         p = *ptr;
1225         ret = 0;
1226         if ((*p < '0') || (*p > '9'))
1227                 return -1;
1228         while ((*p >= '0') && (*p <= '9')) {
1229                 ret = ret * 10 + (*p - '0');
1230                 p++;
1231         }
1232         *ptr = p;
1233         return ret;
1234 }
1235
1236
1237 static char *
1238 substr(char *a, char *b)
1239 {
1240         char *loc1;
1241         char *loc2;
1242
1243         while (*a != '\0') {
1244                 loc1 = a;
1245                 loc2 = b;
1246                 while (*loc1 == *loc2++) {
1247                         if (*loc1 == '\0')
1248                                 return 0;
1249                         loc1++;
1250                         if (*loc2 == '\0')
1251                                 return loc1;
1252                 }
1253                 a++;
1254         }
1255         return 0;
1256 }
1257
1258
1259 static void
1260 mountopts(struct nfs_args *args, char *p)
1261 {
1262         char *tmp;
1263
1264         args->version = NFS_ARGSVERSION;
1265         args->rsize = 8192;
1266         args->wsize = 8192;
1267         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
1268         args->sotype = SOCK_DGRAM;
1269         if (p == NULL)
1270                 return;
1271         if ((tmp = (char *)substr(p, "rsize=")))
1272                 args->rsize = getdec(&tmp);
1273         if ((tmp = (char *)substr(p, "wsize=")))
1274                 args->wsize = getdec(&tmp);
1275         if ((tmp = (char *)substr(p, "intr")))
1276                 args->flags |= NFSMNT_INT;
1277         if ((tmp = (char *)substr(p, "soft")))
1278                 args->flags |= NFSMNT_SOFT;
1279         if ((tmp = (char *)substr(p, "noconn")))
1280                 args->flags |= NFSMNT_NOCONN;
1281         if ((tmp = (char *)substr(p, "tcp")))
1282                 args->sotype = SOCK_STREAM;
1283 }
1284
1285
1286 static int
1287 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
1288 {
1289         struct mbuf *m;
1290         int alignedlen;
1291
1292         m = *mptr;
1293         alignedlen = ( len + 3 ) & ~3;
1294
1295         if (m->m_len < alignedlen) {
1296                 m = m_pullup(m, alignedlen);
1297                 if (m == NULL) {
1298                         *mptr = NULL;
1299                         return EBADRPC;
1300                 }
1301         }
1302         bcopy(mtod(m, u_char *), buf, len);
1303         m_adj(m, alignedlen);
1304         *mptr = m;
1305         return 0;
1306 }
1307
1308
1309 static int
1310 xdr_int_decode(struct mbuf **mptr, int *iptr)
1311 {
1312         u_int32_t i;
1313         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
1314                 return EBADRPC;
1315         *iptr = fxdr_unsigned(u_int32_t, i);
1316         return 0;
1317 }
1318
1319
1320 static void
1321 print_sin_addr(struct sockaddr_in *sin)
1322 {
1323         print_in_addr(sin->sin_addr);
1324 }
1325
1326
1327 static void
1328 print_in_addr(struct in_addr addr)
1329 {
1330         unsigned int ip;
1331
1332         ip = ntohl(addr.s_addr);
1333         printf("%d.%d.%d.%d",
1334                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1335 }
1336
1337 static void
1338 bootpc_compose_query(ifctx, gctx, td)
1339         struct bootpc_ifcontext *ifctx;
1340         struct bootpc_globalcontext *gctx;
1341         struct thread *td;
1342 {
1343         unsigned char *vendp;
1344         unsigned char vendor_client[64];
1345         uint32_t leasetime;
1346         uint8_t vendor_client_len;
1347
1348         ifctx->gotrootpath = 0;
1349
1350         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1351
1352         /* bootpc part */
1353         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1354         ifctx->call.htype = 1;                  /* 10mb ethernet */
1355         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1356         ifctx->call.hops = 0;
1357         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1358                 ifctx->xid++;
1359         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1360         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1361
1362         vendp = ifctx->call.vend;
1363         *vendp++ = 99;          /* RFC1048 cookie */
1364         *vendp++ = 130;
1365         *vendp++ = 83;
1366         *vendp++ = 99;
1367         *vendp++ = TAG_MAXMSGSIZE;
1368         *vendp++ = 2;
1369         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1370         *vendp++ = sizeof(struct bootp_packet) & 255;
1371
1372         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1373                 ostype, MACHINE, osrelease);
1374         vendor_client_len = strlen(vendor_client);
1375         *vendp++ = TAG_VENDOR_INDENTIFIER;
1376         *vendp++ = vendor_client_len;
1377         memcpy(vendp, vendor_client, vendor_client_len);
1378         vendp += vendor_client_len;;
1379         ifctx->dhcpquerytype = DHCP_NOMSG;
1380         switch (ifctx->state) {
1381         case IF_DHCP_UNRESOLVED:
1382                 *vendp++ = TAG_DHCP_MSGTYPE;
1383                 *vendp++ = 1;
1384                 *vendp++ = DHCP_DISCOVER;
1385                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1386                 ifctx->gotdhcpserver = 0;
1387                 break;
1388         case IF_DHCP_OFFERED:
1389                 *vendp++ = TAG_DHCP_MSGTYPE;
1390                 *vendp++ = 1;
1391                 *vendp++ = DHCP_REQUEST;
1392                 ifctx->dhcpquerytype = DHCP_REQUEST;
1393                 *vendp++ = TAG_DHCP_REQ_ADDR;
1394                 *vendp++ = 4;
1395                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1396                 vendp += 4;
1397                 if (ifctx->gotdhcpserver != 0) {
1398                         *vendp++ = TAG_DHCP_SERVERID;
1399                         *vendp++ = 4;
1400                         memcpy(vendp, &ifctx->dhcpserver, 4);
1401                         vendp += 4;
1402                 }
1403                 *vendp++ = TAG_DHCP_LEASETIME;
1404                 *vendp++ = 4;
1405                 leasetime = htonl(300);
1406                 memcpy(vendp, &leasetime, 4);
1407                 vendp += 4;
1408         default:
1409                 ;
1410         }
1411         *vendp = TAG_END;
1412
1413         ifctx->call.secs = 0;
1414         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1415 }
1416
1417
1418 static int
1419 bootpc_hascookie(struct bootp_packet *bp)
1420 {
1421         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1422                 bp->vend[2] == 83 && bp->vend[3] == 99);
1423 }
1424
1425
1426 static void
1427 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1428                   unsigned char *start,
1429                   int len,
1430                   int tag)
1431 {
1432         unsigned char *j;
1433         unsigned char *ej;
1434         unsigned char code;
1435
1436         if (tctx->badtag != 0 || tctx->badopt != 0)
1437                 return;
1438
1439         j = start;
1440         ej = j + len;
1441
1442         while (j < ej) {
1443                 code = *j++;
1444                 if (code == TAG_PAD)
1445                         continue;
1446                 if (code == TAG_END)
1447                         return;
1448                 if (j >= ej || j + *j + 1 > ej) {
1449                         tctx->badopt = 1;
1450                         return;
1451                 }
1452                 len = *j++;
1453                 if (code == tag) {
1454                         if (tctx->taglen + len > TAG_MAXLEN) {
1455                                 tctx->badtag = 1;
1456                                 return;
1457                         }
1458                         tctx->foundopt = 1;
1459                         if (len > 0)
1460                                 memcpy(tctx->buf + tctx->taglen,
1461                                        j, len);
1462                         tctx->taglen += len;
1463                 }
1464                 if (code == TAG_OVERLOAD)
1465                         tctx->overload = *j;
1466
1467                 j += len;
1468         }
1469 }
1470
1471
1472 static unsigned char *
1473 bootpc_tag(struct bootpc_tagcontext *tctx,
1474            struct bootp_packet *bp,
1475            int len,
1476            int tag)
1477 {
1478         unsigned char *j;
1479         unsigned char *ej;
1480
1481         tctx->overload = 0;
1482         tctx->badopt = 0;
1483         tctx->badtag = 0;
1484         tctx->foundopt = 0;
1485         tctx->taglen = 0;
1486
1487         if (bootpc_hascookie(bp) == 0)
1488                 return NULL;
1489
1490         j = &bp->vend[4];
1491         ej = (unsigned char *) bp + len;
1492
1493         bootpc_tag_helper(tctx, &bp->vend[4],
1494                           (unsigned char *) bp + len - &bp->vend[4], tag);
1495
1496         if ((tctx->overload & OVERLOAD_FILE) != 0)
1497                 bootpc_tag_helper(tctx,
1498                                   (unsigned char *) bp->file,
1499                                   sizeof(bp->file),
1500                                   tag);
1501         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1502                 bootpc_tag_helper(tctx,
1503                                   (unsigned char *) bp->sname,
1504                                   sizeof(bp->sname),
1505                                   tag);
1506
1507         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1508                 return NULL;
1509         tctx->buf[tctx->taglen] = '\0';
1510         return tctx->buf;
1511 }
1512
1513
1514 static void
1515 bootpc_decode_reply(nd, ifctx, gctx)
1516         struct nfsv3_diskless *nd;
1517         struct bootpc_ifcontext *ifctx;
1518         struct bootpc_globalcontext *gctx;
1519 {
1520         char *p;
1521         unsigned int ip;
1522
1523         ifctx->gotgw = 0;
1524         ifctx->gotnetmask = 0;
1525
1526         clear_sinaddr(&ifctx->myaddr);
1527         clear_sinaddr(&ifctx->netmask);
1528         clear_sinaddr(&ifctx->gw);
1529
1530         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1531
1532         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1533         snprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1534                  "swap.%d.%d.%d.%d",
1535                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1536
1537         printf("%s at ", ifctx->ireq.ifr_name);
1538         print_sin_addr(&ifctx->myaddr);
1539         printf(" server ");
1540         print_in_addr(ifctx->reply.siaddr);
1541
1542         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1543         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1544                 printf(" via gateway ");
1545                 print_in_addr(ifctx->reply.giaddr);
1546         }
1547
1548         /* This call used for the side effect (overload flag) */
1549         (void) bootpc_tag(&gctx->tmptag,
1550                           &ifctx->reply, ifctx->replylen, TAG_END);
1551
1552         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1553                 if (ifctx->reply.sname[0] != '\0')
1554                         printf(" server name %s", ifctx->reply.sname);
1555         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1556                 if (ifctx->reply.file[0] != '\0')
1557                         printf(" boot file %s", ifctx->reply.file);
1558
1559         printf("\n");
1560
1561         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1562                        TAG_SUBNETMASK);
1563         if (p != NULL) {
1564                 if (gctx->tag.taglen != 4)
1565                         panic("bootpc: subnet mask len is %d",
1566                               gctx->tag.taglen);
1567                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1568                 ifctx->gotnetmask = 1;
1569                 printf("subnet mask ");
1570                 print_sin_addr(&ifctx->netmask);
1571                 printf(" ");
1572         }
1573
1574         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1575                        TAG_ROUTERS);
1576         if (p != NULL) {
1577                 /* Routers */
1578                 if (gctx->tag.taglen % 4)
1579                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1580                 if (gctx->tag.taglen > 0) {
1581                         bcopy(p, &ifctx->gw.sin_addr, 4);
1582                         printf("router ");
1583                         print_sin_addr(&ifctx->gw);
1584                         printf(" ");
1585                         ifctx->gotgw = 1;
1586                         gctx->gotgw = 1;
1587                 }
1588         }
1589
1590         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1591                        TAG_ROOT);
1592         if (p != NULL) {
1593                 if (gctx->setrootfs != NULL) {
1594                         printf("rootfs %s (ignored) ", p);
1595                 } else  if (setfs(&nd->root_saddr,
1596                                   nd->root_hostnam, p)) {
1597                         printf("rootfs %s ",p);
1598                         gctx->gotrootpath = 1;
1599                         ifctx->gotrootpath = 1;
1600                         gctx->setrootfs = ifctx;
1601
1602                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1603                                        ifctx->replylen,
1604                                        TAG_ROOTOPTS);
1605                         if (p != NULL) {
1606                                 mountopts(&nd->root_args, p);
1607                                 printf("rootopts %s ", p);
1608                         }
1609                 } else
1610                         panic("Failed to set rootfs to %s",p);
1611         }
1612
1613         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1614                        TAG_SWAP);
1615         if (p != NULL) {
1616                 if (gctx->setswapfs != NULL) {
1617                         printf("swapfs %s (ignored) ", p);
1618                 } else  if (setfs(&nd->swap_saddr,
1619                                   nd->swap_hostnam, p)) {
1620                         gctx->gotswappath = 1;
1621                         gctx->setswapfs = ifctx;
1622                         printf("swapfs %s ", p);
1623
1624                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1625                                        ifctx->replylen,
1626                                        TAG_SWAPOPTS);
1627                         if (p != NULL) {
1628                                 /* swap mount options */
1629                                 mountopts(&nd->swap_args, p);
1630                                 printf("swapopts %s ", p);
1631                         }
1632
1633                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1634                                        ifctx->replylen,
1635                                        TAG_SWAPSIZE);
1636                         if (p != NULL) {
1637                                 int swaplen;
1638                                 if (gctx->tag.taglen != 4)
1639                                         panic("bootpc: "
1640                                               "Expected 4 bytes for swaplen, "
1641                                               "not %d bytes",
1642                                               gctx->tag.taglen);
1643                                 bcopy(p, &swaplen, 4);
1644                                 nd->swap_nblks = ntohl(swaplen);
1645                                 printf("swapsize %d KB ",
1646                                        nd->swap_nblks);
1647                         }
1648                 } else
1649                         panic("Failed to set swapfs to %s", p);
1650         }
1651
1652         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1653                        TAG_HOSTNAME);
1654         if (p != NULL) {
1655                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1656                         panic("bootpc: hostname >= %d bytes",
1657                               MAXHOSTNAMELEN);
1658                 if (gctx->sethostname != NULL) {
1659                         printf("hostname %s (ignored) ", p);
1660                 } else {
1661                         strcpy(nd->my_hostnam, p);
1662                         strcpy(hostname, p);
1663                         printf("hostname %s ",hostname);
1664                         gctx->sethostname = ifctx;
1665                 }
1666         }
1667         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1668                        TAG_COOKIE);
1669         if (p != NULL) {        /* store in a sysctl variable */
1670                 int i, l = sizeof(bootp_cookie) - 1;
1671                 for (i = 0; i < l && p[i] != '\0'; i++)
1672                         bootp_cookie[i] = p[i];
1673                 p[i] = '\0';
1674         }
1675
1676         printf("\n");
1677
1678         if (ifctx->gotnetmask == 0) {
1679                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1680                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1681                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1682                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1683                 else
1684                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1685         }
1686         if (ifctx->gotgw == 0) {
1687                 /* Use proxyarp */
1688                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1689         }
1690 }
1691
1692 void
1693 bootpc_init(void)
1694 {
1695         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1696         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1697         struct ifnet *ifp;
1698         int error;
1699         struct nfsv3_diskless *nd;
1700         struct thread *td;
1701
1702         nd = &nfsv3_diskless;
1703         td = curthread;
1704
1705         /*
1706          * If already filled in, don't touch it here
1707          */
1708         if (nfs_diskless_valid != 0)
1709                 return;
1710
1711         /*
1712          * Wait until arp entries can be handled.
1713          */
1714         while (time_second == 0)
1715                 tsleep(&time_second, 0, "arpkludge", 10);
1716
1717         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK);
1718         if (gctx == NULL)
1719                 panic("Failed to allocate bootp global context structure");
1720
1721         bzero(gctx, sizeof(*gctx));
1722         gctx->xid = ~0xFFFF;
1723         gctx->starttime = time_second;
1724
1725         ifctx = allocifctx(gctx);
1726
1727         /*
1728          * Find a network interface.
1729          */
1730 #ifdef BOOTP_WIRED_TO
1731         printf("bootpc_init: wired to interface '%s'\n",
1732                __XSTRING(BOOTP_WIRED_TO));
1733 #endif
1734         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1735         for (ifp = TAILQ_FIRST(&ifnet);
1736              ifp != NULL;
1737              ifp = TAILQ_NEXT(ifp, if_link)) {
1738                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1739                          sizeof(ifctx->ireq.ifr_name));
1740 #ifdef BOOTP_WIRED_TO
1741                 if (strcmp(ifctx->ireq.ifr_name,
1742                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1743                         continue;
1744 #else
1745                 if ((ifp->if_flags &
1746                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1747                     IFF_BROADCAST)
1748                         continue;
1749 #endif
1750                 if (gctx->interfaces != NULL)
1751                         gctx->lastinterface->next = ifctx;
1752                 else
1753                         gctx->interfaces = ifctx;
1754                 ifctx->ifp = ifp;
1755                 gctx->lastinterface = ifctx;
1756                 ifctx = allocifctx(gctx);
1757         }
1758         free(ifctx, M_TEMP);
1759
1760         if (gctx->interfaces == NULL) {
1761 #ifdef BOOTP_WIRED_TO
1762                 panic("bootpc_init: Could not find interface specified "
1763                       "by BOOTP_WIRED_TO: "
1764                       __XSTRING(BOOTP_WIRED_TO));
1765 #else
1766                 panic("bootpc_init: no suitable interface");
1767 #endif
1768         }
1769
1770         gctx->gotrootpath = 0;
1771         gctx->gotswappath = 0;
1772         gctx->gotgw = 0;
1773
1774         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1775                 bootpc_fakeup_interface(ifctx, gctx, td);
1776
1777         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1778                 bootpc_compose_query(ifctx, gctx, td);
1779
1780         ifctx = gctx->interfaces;
1781         error = bootpc_call(gctx, td);
1782
1783         if (error != 0) {
1784 #ifdef BOOTP_NFSROOT
1785                 panic("BOOTP call failed");
1786 #else
1787                 printf("BOOTP call failed\n");
1788 #endif
1789         }
1790
1791         mountopts(&nd->root_args, NULL);
1792
1793         mountopts(&nd->swap_args, NULL);
1794
1795         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1796                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1797                         bootpc_decode_reply(nd, ifctx, gctx);
1798
1799         if (gctx->gotswappath == 0)
1800                 nd->swap_nblks = 0;
1801 #ifdef BOOTP_NFSROOT
1802         if (gctx->gotrootpath == 0)
1803                 panic("bootpc: No root path offered");
1804 #endif
1805
1806         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1807                 bootpc_adjust_interface(ifctx, gctx, td);
1808
1809                 soclose(ifctx->so);
1810         }
1811
1812         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1813                 if (ifctx->gotrootpath != 0)
1814                         break;
1815         if (ifctx == NULL) {
1816                 for (ifctx = gctx->interfaces;
1817                      ifctx != NULL;
1818                      ifctx = ifctx->next)
1819                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1820                                 break;
1821         }
1822         if (ifctx == NULL)
1823                 goto out;
1824
1825         if (gctx->gotrootpath != 0) {
1826
1827                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1828                                  nd->root_fh, &nd->root_fhsize,
1829                                  &nd->root_args, td);
1830                 if (error != 0)
1831                         panic("nfs_boot: mountd root, error=%d", error);
1832
1833                 if (gctx->gotswappath != 0) {
1834
1835                         error = md_mount(&nd->swap_saddr,
1836                                          nd->swap_hostnam,
1837                                          nd->swap_fh, &nd->swap_fhsize,
1838                                          &nd->swap_args, td);
1839                         if (error != 0)
1840                                 panic("nfs_boot: mountd swap, error=%d",
1841                                       error);
1842
1843                         error = md_lookup_swap(&nd->swap_saddr,
1844                                                gctx->lookup_path,
1845                                                nd->swap_fh, &nd->swap_fhsize,
1846                                                &nd->swap_args, td);
1847                         if (error != 0)
1848                                 panic("nfs_boot: lookup swap, error=%d",
1849                                       error);
1850                 }
1851                 nfs_diskless_valid = 3;
1852         }
1853
1854         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1855         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1856         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1857         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1858                 ifctx->myaddr.sin_addr.s_addr |
1859                 ~ ifctx->netmask.sin_addr.s_addr;
1860         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1861
1862 out:
1863         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1864                 nctx = ifctx->next;
1865                 free(ifctx, M_TEMP);
1866         }
1867         free(gctx, M_TEMP);
1868 }
1869
1870
1871 /*
1872  * RPC: mountd/mount
1873  * Given a server pathname, get an NFS file handle.
1874  * Also, sets sin->sin_port to the NFS service port.
1875  */
1876 static int
1877 md_mount(struct sockaddr_in *mdsin,             /* mountd server address */
1878          char *path,
1879          u_char *fhp,
1880          int *fhsizep,
1881          struct nfs_args *args,
1882          struct thread *td)
1883 {
1884         struct mbuf *m;
1885         int error;
1886         int authunixok;
1887         int authcount;
1888         int authver;
1889
1890 #ifdef BOOTP_NFSV3
1891         /* First try NFS v3 */
1892         /* Get port number for MOUNTD. */
1893         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1894                              &mdsin->sin_port, td);
1895         if (error == 0) {
1896                 m = xdr_string_encode(path, strlen(path));
1897
1898                 /* Do RPC to mountd. */
1899                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
1900                                   RPCMNT_MOUNT, &m, NULL, td);
1901         }
1902         if (error == 0) {
1903                 args->flags |= NFSMNT_NFSV3;
1904         } else {
1905 #endif
1906                 /* Fallback to NFS v2 */
1907
1908                 /* Get port number for MOUNTD. */
1909                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1910                                      &mdsin->sin_port, td);
1911                 if (error != 0)
1912                         return error;
1913
1914                 m = xdr_string_encode(path, strlen(path));
1915
1916                 /* Do RPC to mountd. */
1917                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
1918                                   RPCMNT_MOUNT, &m, NULL, td);
1919                 if (error != 0)
1920                         return error;   /* message already freed */
1921
1922 #ifdef BOOTP_NFSV3
1923         }
1924 #endif
1925
1926         if (xdr_int_decode(&m, &error) != 0 || error != 0)
1927                 goto bad;
1928
1929         if ((args->flags & NFSMNT_NFSV3) != 0) {
1930                 if (xdr_int_decode(&m, fhsizep) != 0 ||
1931                     *fhsizep > NFSX_V3FHMAX ||
1932                     *fhsizep <= 0)
1933                         goto bad;
1934         } else
1935                 *fhsizep = NFSX_V2FH;
1936
1937         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
1938                 goto bad;
1939
1940         if (args->flags & NFSMNT_NFSV3) {
1941                 if (xdr_int_decode(&m, &authcount) != 0)
1942                         goto bad;
1943                 authunixok = 0;
1944                 if (authcount < 0 || authcount > 100)
1945                         goto bad;
1946                 while (authcount > 0) {
1947                         if (xdr_int_decode(&m, &authver) != 0)
1948                                 goto bad;
1949                         if (authver == RPCAUTH_UNIX)
1950                                 authunixok = 1;
1951                         authcount--;
1952                 }
1953                 if (authunixok == 0)
1954                         goto bad;
1955         }
1956
1957         /* Set port number for NFS use. */
1958         error = krpc_portmap(mdsin, NFS_PROG,
1959                              (args->flags &
1960                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
1961                              &mdsin->sin_port, td);
1962
1963         goto out;
1964
1965 bad:
1966         error = EBADRPC;
1967
1968 out:
1969         m_freem(m);
1970         return error;
1971 }
1972
1973
1974 static int
1975 md_lookup_swap(struct sockaddr_in *mdsin,       /* mountd server address */
1976                char *path,
1977                u_char *fhp,
1978                int *fhsizep,
1979                struct nfs_args *args,
1980                struct thread *td)
1981 {
1982         struct mbuf *m;
1983         int error;
1984         int size = -1;
1985         int attribs_present;
1986         int status;
1987         union {
1988                 u_int32_t v2[17];
1989                 u_int32_t v3[21];
1990         } fattribs;
1991
1992         m = m_get(M_WAIT,MT_DATA);
1993         if (m == NULL)
1994                 return ENOBUFS;
1995
1996         if ((args->flags & NFSMNT_NFSV3) != 0) {
1997                 *mtod(m, u_int32_t *) = txdr_unsigned(*fhsizep);
1998                 bcopy(fhp, mtod(m, u_char *) + sizeof(u_int32_t), *fhsizep);
1999                 m->m_len = *fhsizep + sizeof(u_int32_t);
2000         } else {
2001                 bcopy(fhp, mtod(m, u_char *), NFSX_V2FH);
2002                 m->m_len = NFSX_V2FH;
2003         }
2004
2005         m->m_next = xdr_string_encode(path, strlen(path));
2006         if (m->m_next == NULL) {
2007                 error = ENOBUFS;
2008                 goto out;
2009         }
2010
2011         /* Do RPC to nfsd. */
2012         if ((args->flags & NFSMNT_NFSV3) != 0)
2013                 error = krpc_call(mdsin, NFS_PROG, NFS_VER3,
2014                                   NFSPROC_LOOKUP, &m, NULL, td);
2015         else
2016                 error = krpc_call(mdsin, NFS_PROG, NFS_VER2,
2017                                   NFSV2PROC_LOOKUP, &m, NULL, td);
2018         if (error != 0)
2019                 return error;   /* message already freed */
2020
2021         if (xdr_int_decode(&m, &status) != 0)
2022                 goto bad;
2023         if (status != 0) {
2024                 error = ENOENT;
2025                 goto out;
2026         }
2027
2028         if ((args->flags & NFSMNT_NFSV3) != 0) {
2029                 if (xdr_int_decode(&m, fhsizep) != 0 ||
2030                     *fhsizep > NFSX_V3FHMAX ||
2031                     *fhsizep <= 0)
2032                         goto bad;
2033         } else
2034                 *fhsizep = NFSX_V2FH;
2035
2036         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
2037                 goto bad;
2038
2039         if ((args->flags & NFSMNT_NFSV3) != 0) {
2040                 if (xdr_int_decode(&m, &attribs_present) != 0)
2041                         goto bad;
2042                 if (attribs_present != 0) {
2043                         if (xdr_opaque_decode(&m, (u_char *) &fattribs.v3,
2044                                               sizeof(u_int32_t) * 21) != 0)
2045                                 goto bad;
2046                         size = fxdr_unsigned(u_int32_t, fattribs.v3[6]);
2047                 }
2048         } else {
2049                 if (xdr_opaque_decode(&m,(u_char *) &fattribs.v2,
2050                                       sizeof(u_int32_t) * 17) != 0)
2051                         goto bad;
2052                 size = fxdr_unsigned(u_int32_t, fattribs.v2[5]);
2053         }
2054
2055         if (nfsv3_diskless.swap_nblks == 0 && size != -1) {
2056                 nfsv3_diskless.swap_nblks = size / 1024;
2057                 printf("md_lookup_swap: Swap size is %d KB\n",
2058                        nfsv3_diskless.swap_nblks);
2059         }
2060
2061         goto out;
2062
2063 bad:
2064         error = EBADRPC;
2065
2066 out:
2067         m_freem(m);
2068         return error;
2069 }