The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/nfsclient/bootp_subr.c

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    1 /*
    2  * Copyright (c) 1995 Gordon Ross, Adam Glass
    3  * Copyright (c) 1992 Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This software was developed by the Computer Systems Engineering group
    7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
    8  * contributed to Berkeley.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Lawrence Berkeley Laboratory and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  * based on:
   39  *      nfs/krpc_subr.c
   40  *      $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __FBSDID("$FreeBSD: releng/5.3/sys/nfsclient/bootp_subr.c 132808 2004-07-28 21:54:57Z phk $");
   45 
   46 #include "opt_bootp.h"
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/sockio.h>
   52 #include <sys/malloc.h>
   53 #include <sys/mount.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/proc.h>
   56 #include <sys/socket.h>
   57 #include <sys/socketvar.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/uio.h>
   60 
   61 #include <net/if.h>
   62 #include <net/route.h>
   63 
   64 #include <netinet/in.h>
   65 #include <net/if_types.h>
   66 #include <net/if_dl.h>
   67 
   68 #include <rpc/rpcclnt.h>
   69 
   70 #include <nfs/rpcv2.h>
   71 #include <nfs/nfsproto.h>
   72 #include <nfsclient/nfs.h>
   73 #include <nfsclient/nfsdiskless.h>
   74 #include <nfsclient/krpc.h>
   75 #include <nfs/xdr_subs.h>
   76 
   77 
   78 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
   79 
   80 #ifndef BOOTP_SETTLE_DELAY
   81 #define BOOTP_SETTLE_DELAY 3
   82 #endif
   83 
   84 /*
   85  * What is the longest we will wait before re-sending a request?
   86  * Note this is also the frequency of "RPC timeout" messages.
   87  * The re-send loop count sup linearly to this maximum, so the
   88  * first complaint will happen after (1+2+3+4+5)=15 seconds.
   89  */
   90 #define MAX_RESEND_DELAY 5      /* seconds */
   91 
   92 /* Definitions from RFC951 */
   93 struct bootp_packet {
   94         u_int8_t op;
   95         u_int8_t htype;
   96         u_int8_t hlen;
   97         u_int8_t hops;
   98         u_int32_t xid;
   99         u_int16_t secs;
  100         u_int16_t flags;
  101         struct in_addr ciaddr;
  102         struct in_addr yiaddr;
  103         struct in_addr siaddr;
  104         struct in_addr giaddr;
  105         unsigned char chaddr[16];
  106         char sname[64];
  107         char file[128];
  108         unsigned char vend[1222];
  109 };
  110 
  111 struct bootpc_ifcontext {
  112         struct bootpc_ifcontext *next;
  113         struct bootp_packet call;
  114         struct bootp_packet reply;
  115         int replylen;
  116         int overload;
  117         struct socket *so;
  118         struct ifreq ireq;
  119         struct ifnet *ifp;
  120         struct sockaddr_dl *sdl;
  121         struct sockaddr_in myaddr;
  122         struct sockaddr_in netmask;
  123         struct sockaddr_in gw;
  124         struct sockaddr_in broadcast;   /* Different for each interface */
  125         int gotgw;
  126         int gotnetmask;
  127         int gotrootpath;
  128         int outstanding;
  129         int sentmsg;
  130         u_int32_t xid;
  131         enum {
  132                 IF_BOOTP_UNRESOLVED,
  133                 IF_BOOTP_RESOLVED,
  134                 IF_BOOTP_FAILED,
  135                 IF_DHCP_UNRESOLVED,
  136                 IF_DHCP_OFFERED,
  137                 IF_DHCP_RESOLVED,
  138                 IF_DHCP_FAILED,
  139         } state;
  140         int dhcpquerytype;              /* dhcp type sent */
  141         struct in_addr dhcpserver;
  142         int gotdhcpserver;
  143 };
  144 
  145 #define TAG_MAXLEN 1024
  146 struct bootpc_tagcontext {
  147         char buf[TAG_MAXLEN + 1];
  148         int overload;
  149         int badopt;
  150         int badtag;
  151         int foundopt;
  152         int taglen;
  153 };
  154 
  155 struct bootpc_globalcontext {
  156         struct bootpc_ifcontext *interfaces;
  157         struct bootpc_ifcontext *lastinterface;
  158         u_int32_t xid;
  159         int gotrootpath;
  160         int gotgw;
  161         int ifnum;
  162         int secs;
  163         int starttime;
  164         struct bootp_packet reply;
  165         int replylen;
  166         struct bootpc_ifcontext *setrootfs;
  167         struct bootpc_ifcontext *sethostname;
  168         struct bootpc_tagcontext tmptag;
  169         struct bootpc_tagcontext tag;
  170 };
  171 
  172 #define IPPORT_BOOTPC 68
  173 #define IPPORT_BOOTPS 67
  174 
  175 #define BOOTP_REQUEST 1
  176 #define BOOTP_REPLY 2
  177 
  178 /* Common tags */
  179 #define TAG_PAD           0  /* Pad option, implicit length 1 */
  180 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
  181 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
  182 #define TAG_HOSTNAME     12  /* Client host name */
  183 #define TAG_ROOT         17  /* Root path */
  184 
  185 /* DHCP specific tags */
  186 #define TAG_OVERLOAD     52  /* Option Overload */
  187 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
  188 
  189 #define TAG_END         255  /* End Option (i.e. no more options) */
  190 
  191 /* Overload values */
  192 #define OVERLOAD_FILE     1
  193 #define OVERLOAD_SNAME    2
  194 
  195 /* Site specific tags: */
  196 #define TAG_ROOTOPTS    130
  197 #define TAG_COOKIE      134     /* ascii info for userland, via sysctl */
  198 
  199 #define TAG_DHCP_MSGTYPE 53
  200 #define TAG_DHCP_REQ_ADDR 50
  201 #define TAG_DHCP_SERVERID 54
  202 #define TAG_DHCP_LEASETIME 51
  203 
  204 #define TAG_VENDOR_INDENTIFIER 60
  205 
  206 #define DHCP_NOMSG    0
  207 #define DHCP_DISCOVER 1
  208 #define DHCP_OFFER    2
  209 #define DHCP_REQUEST  3
  210 #define DHCP_ACK      5
  211 
  212 static char bootp_cookie[128];
  213 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
  214         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
  215 
  216 /* mountd RPC */
  217 static int      md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
  218                     int *fhsizep, struct nfs_args *args, struct thread *td);
  219 static int      setfs(struct sockaddr_in *addr, char *path, char *p,
  220                     const struct in_addr *siaddr);
  221 static int      getdec(char **ptr);
  222 static int      getip(char **ptr, struct in_addr *ip);
  223 static char     *substr(char *a, char *b);
  224 static void     mountopts(struct nfs_args *args, char *p);
  225 static int      xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
  226 static int      xdr_int_decode(struct mbuf **ptr, int *iptr);
  227 static void     print_in_addr(struct in_addr addr);
  228 static void     print_sin_addr(struct sockaddr_in *addr);
  229 static void     clear_sinaddr(struct sockaddr_in *sin);
  230 static void     allocifctx(struct bootpc_globalcontext *gctx);
  231 static void     bootpc_compose_query(struct bootpc_ifcontext *ifctx,
  232                     struct bootpc_globalcontext *gctx, struct thread *td);
  233 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
  234                     struct bootp_packet *bp, int len, int tag);
  235 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
  236                     unsigned char *start, int len, int tag);
  237 
  238 #ifdef BOOTP_DEBUG
  239 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
  240 void bootpboot_p_ma(struct sockaddr *ma);
  241 void bootpboot_p_rtentry(struct rtentry *rt);
  242 void bootpboot_p_tree(struct radix_node *rn);
  243 void bootpboot_p_rtlist(void);
  244 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
  245 void bootpboot_p_iflist(void);
  246 #endif
  247 
  248 static int      bootpc_call(struct bootpc_globalcontext *gctx,
  249                     struct thread *td);
  250 
  251 static int      bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  252                     struct bootpc_globalcontext *gctx, struct thread *td);
  253 
  254 static int      bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
  255                     struct bootpc_globalcontext *gctx, struct thread *td);
  256 
  257 static void     bootpc_decode_reply(struct nfsv3_diskless *nd,
  258                     struct bootpc_ifcontext *ifctx,
  259                     struct bootpc_globalcontext *gctx);
  260 
  261 static int      bootpc_received(struct bootpc_globalcontext *gctx,
  262                     struct bootpc_ifcontext *ifctx);
  263 
  264 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
  265 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
  266 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
  267 
  268 /*
  269  * In order to have multiple active interfaces with address 0.0.0.0
  270  * and be able to send data to a selected interface, we perform
  271  * some tricks:
  272  *
  273  *  - The 'broadcast' address is different for each interface.
  274  *
  275  *  - We temporarily add routing pointing 255.255.255.255 to the
  276  *    selected interface broadcast address, thus the packet sent
  277  *    goes to that interface.
  278  */
  279 
  280 #ifdef BOOTP_DEBUG
  281 void
  282 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
  283 {
  284 
  285         if (sa == NULL) {
  286                 printf("(sockaddr *) <null>");
  287                 return;
  288         }
  289         switch (sa->sa_family) {
  290         case AF_INET:
  291         {
  292                 struct sockaddr_in *sin;
  293 
  294                 sin = (struct sockaddr_in *) sa;
  295                 printf("inet ");
  296                 print_sin_addr(sin);
  297                 if (ma != NULL) {
  298                         sin = (struct sockaddr_in *) ma;
  299                         printf(" mask ");
  300                         print_sin_addr(sin);
  301                 }
  302         }
  303         break;
  304         case AF_LINK:
  305         {
  306                 struct sockaddr_dl *sli;
  307                 int i;
  308 
  309                 sli = (struct sockaddr_dl *) sa;
  310                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
  311                 for (i = 0; i < sli->sdl_alen; i++) {
  312                         if (i > 0)
  313                                 printf(":");
  314                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
  315                 }
  316         }
  317         break;
  318         default:
  319                 printf("af%d", sa->sa_family);
  320         }
  321 }
  322 
  323 void
  324 bootpboot_p_ma(struct sockaddr *ma)
  325 {
  326 
  327         if (ma == NULL) {
  328                 printf("<null>");
  329                 return;
  330         }
  331         printf("%x", *(int *)ma);
  332 }
  333 
  334 void
  335 bootpboot_p_rtentry(struct rtentry *rt)
  336 {
  337 
  338         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
  339         printf(" ");
  340         bootpboot_p_ma(rt->rt_genmask);
  341         printf(" ");
  342         bootpboot_p_sa(rt->rt_gateway, NULL);
  343         printf(" ");
  344         printf("flags %x", (unsigned short) rt->rt_flags);
  345         printf(" %d", (int) rt->rt_rmx.rmx_expire);
  346         printf(" %s\n", rt->rt_ifp->if_xname);
  347 }
  348 
  349 void
  350 bootpboot_p_tree(struct radix_node *rn)
  351 {
  352 
  353         while (rn != NULL) {
  354                 if (rn->rn_bit < 0) {
  355                         if ((rn->rn_flags & RNF_ROOT) != 0) {
  356                         } else {
  357                                 bootpboot_p_rtentry((struct rtentry *) rn);
  358                         }
  359                         rn = rn->rn_dupedkey;
  360                 } else {
  361                         bootpboot_p_tree(rn->rn_left);
  362                         bootpboot_p_tree(rn->rn_right);
  363                         return;
  364                 }
  365         }
  366 }
  367 
  368 void
  369 bootpboot_p_rtlist(void)
  370 {
  371 
  372         printf("Routing table:\n");
  373         RADIX_NODE_LOCK(rt_tables[AF_INET]);    /* could sleep XXX */
  374         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
  375         RADIX_NODE_UNLOCK(rt_tables[AF_INET]);
  376 }
  377 
  378 void
  379 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
  380 {
  381 
  382         printf("%s flags %x, addr ",
  383                ifp->if_xname, ifp->if_flags);
  384         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
  385         printf(", broadcast ");
  386         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
  387         printf(", netmask ");
  388         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
  389         printf("\n");
  390 }
  391 
  392 void
  393 bootpboot_p_iflist(void)
  394 {
  395         struct ifnet *ifp;
  396         struct ifaddr *ifa;
  397 
  398         printf("Interface list:\n");
  399         IFNET_RLOCK(); /* could sleep, but okay for debugging XXX */
  400         for (ifp = TAILQ_FIRST(&ifnet);
  401              ifp != NULL;
  402              ifp = TAILQ_NEXT(ifp, if_link)) {
  403                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
  404                      ifa != NULL;
  405                      ifa = TAILQ_NEXT(ifa, ifa_link))
  406                         if (ifa->ifa_addr->sa_family == AF_INET)
  407                                 bootpboot_p_if(ifp, ifa);
  408         }
  409         IFNET_RUNLOCK();
  410 }
  411 #endif /* defined(BOOTP_DEBUG) */
  412 
  413 static void
  414 clear_sinaddr(struct sockaddr_in *sin)
  415 {
  416 
  417         bzero(sin, sizeof(*sin));
  418         sin->sin_len = sizeof(*sin);
  419         sin->sin_family = AF_INET;
  420         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
  421         sin->sin_port = 0;
  422 }
  423 
  424 static void
  425 allocifctx(struct bootpc_globalcontext *gctx)
  426 {
  427         struct bootpc_ifcontext *ifctx;
  428         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
  429                                                    M_TEMP, M_WAITOK | M_ZERO);
  430         if (ifctx == NULL)
  431                 panic("Failed to allocate bootp interface context structure");
  432 
  433         ifctx->xid = gctx->xid;
  434 #ifdef BOOTP_NO_DHCP
  435         ifctx->state = IF_BOOTP_UNRESOLVED;
  436 #else
  437         ifctx->state = IF_DHCP_UNRESOLVED;
  438 #endif
  439         gctx->xid += 0x100;
  440         if (gctx->interfaces != NULL)
  441                 gctx->lastinterface->next = ifctx;
  442         else
  443                 gctx->interfaces = ifctx;
  444         gctx->lastinterface = ifctx;
  445 }
  446 
  447 static __inline int
  448 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
  449 {
  450 
  451         if (ifctx->state == IF_BOOTP_RESOLVED ||
  452             ifctx->state == IF_DHCP_RESOLVED)
  453                 return 1;
  454         return 0;
  455 }
  456 
  457 static __inline int
  458 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
  459 {
  460 
  461         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
  462             ifctx->state == IF_DHCP_UNRESOLVED)
  463                 return 1;
  464         return 0;
  465 }
  466 
  467 static __inline int
  468 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
  469 {
  470 
  471         if (ifctx->state == IF_BOOTP_FAILED ||
  472             ifctx->state == IF_DHCP_FAILED)
  473                 return 1;
  474         return 0;
  475 }
  476 
  477 static int
  478 bootpc_received(struct bootpc_globalcontext *gctx,
  479     struct bootpc_ifcontext *ifctx)
  480 {
  481         unsigned char dhcpreplytype;
  482         char *p;
  483 
  484         /*
  485          * Need timeout for fallback to less
  486          * desirable alternative.
  487          */
  488 
  489         /* This call used for the side effect (badopt flag) */
  490         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
  491                           gctx->replylen,
  492                           TAG_END);
  493 
  494         /* If packet is invalid, ignore it */
  495         if (gctx->tmptag.badopt != 0)
  496                 return 0;
  497 
  498         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
  499                        gctx->replylen, TAG_DHCP_MSGTYPE);
  500         if (p != NULL)
  501                 dhcpreplytype = *p;
  502         else
  503                 dhcpreplytype = DHCP_NOMSG;
  504 
  505         switch (ifctx->dhcpquerytype) {
  506         case DHCP_DISCOVER:
  507                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
  508 #ifndef BOOTP_FORCE_DHCP
  509                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
  510 #endif
  511                         )
  512                         return 0;
  513                 break;
  514         case DHCP_REQUEST:
  515                 if (dhcpreplytype != DHCP_ACK)
  516                         return 0;
  517         case DHCP_NOMSG:
  518                 break;
  519         }
  520 
  521         /* Ignore packet unless it gives us a root tag we didn't have */
  522 
  523         if ((ifctx->state == IF_BOOTP_RESOLVED ||
  524              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  525               (ifctx->state == IF_DHCP_OFFERED ||
  526                ifctx->state == IF_DHCP_RESOLVED))) &&
  527             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  528                         ifctx->replylen,
  529                         TAG_ROOT) != NULL ||
  530              bootpc_tag(&gctx->tmptag, &gctx->reply,
  531                         gctx->replylen,
  532                         TAG_ROOT) == NULL))
  533                 return 0;
  534 
  535         bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
  536         ifctx->replylen = gctx->replylen;
  537 
  538         /* XXX: Only reset if 'perfect' response */
  539         if (ifctx->state == IF_BOOTP_UNRESOLVED)
  540                 ifctx->state = IF_BOOTP_RESOLVED;
  541         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
  542                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
  543                 if (dhcpreplytype == DHCP_OFFER)
  544                         ifctx->state = IF_DHCP_OFFERED;
  545                 else
  546                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
  547         } else if (ifctx->state == IF_DHCP_OFFERED &&
  548                    ifctx->dhcpquerytype == DHCP_REQUEST)
  549                 ifctx->state = IF_DHCP_RESOLVED;
  550 
  551 
  552         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  553             ifctx->state != IF_BOOTP_RESOLVED) {
  554                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
  555                                ifctx->replylen, TAG_DHCP_SERVERID);
  556                 if (p != NULL && gctx->tmptag.taglen == 4) {
  557                         memcpy(&ifctx->dhcpserver, p, 4);
  558                         ifctx->gotdhcpserver = 1;
  559                 } else
  560                         ifctx->gotdhcpserver = 0;
  561                 return 1;
  562         }
  563 
  564         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  565                                          ifctx->replylen,
  566                                          TAG_ROOT) != NULL);
  567         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  568                                    ifctx->replylen,
  569                                    TAG_ROUTERS) != NULL);
  570         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  571                                         ifctx->replylen,
  572                                         TAG_SUBNETMASK) != NULL);
  573         return 1;
  574 }
  575 
  576 static int
  577 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
  578 {
  579         struct socket *so;
  580         struct sockaddr_in *sin, dst;
  581         struct uio auio;
  582         struct sockopt sopt;
  583         struct iovec aio;
  584         int error, on, rcvflg, timo, len;
  585         time_t atimo;
  586         time_t rtimo;
  587         struct timeval tv;
  588         struct bootpc_ifcontext *ifctx;
  589         int outstanding;
  590         int gotrootpath;
  591         int retry;
  592         const char *s;
  593 
  594         NET_ASSERT_GIANT();
  595 
  596         /*
  597          * Create socket and set its recieve timeout.
  598          */
  599         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td);
  600         if (error != 0)
  601                 goto out0;
  602 
  603         tv.tv_sec = 1;
  604         tv.tv_usec = 0;
  605         bzero(&sopt, sizeof(sopt));
  606         sopt.sopt_dir = SOPT_SET;
  607         sopt.sopt_level = SOL_SOCKET;
  608         sopt.sopt_name = SO_RCVTIMEO;
  609         sopt.sopt_val = &tv;
  610         sopt.sopt_valsize = sizeof tv;
  611 
  612         error = sosetopt(so, &sopt);
  613         if (error != 0)
  614                 goto out;
  615 
  616         /*
  617          * Enable broadcast.
  618          */
  619         on = 1;
  620         sopt.sopt_name = SO_BROADCAST;
  621         sopt.sopt_val = &on;
  622         sopt.sopt_valsize = sizeof on;
  623 
  624         error = sosetopt(so, &sopt);
  625         if (error != 0)
  626                 goto out;
  627 
  628         /*
  629          * Disable routing.
  630          */
  631 
  632         on = 1;
  633         sopt.sopt_name = SO_DONTROUTE;
  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          * Bind the local endpoint to a bootp client port.
  643          */
  644         sin = &dst;
  645         clear_sinaddr(sin);
  646         sin->sin_port = htons(IPPORT_BOOTPC);
  647         error = sobind(so, (struct sockaddr *)sin, td);
  648         if (error != 0) {
  649                 printf("bind failed\n");
  650                 goto out;
  651         }
  652 
  653         /*
  654          * Setup socket address for the server.
  655          */
  656         sin = &dst;
  657         clear_sinaddr(sin);
  658         sin->sin_addr.s_addr = INADDR_BROADCAST;
  659         sin->sin_port = htons(IPPORT_BOOTPS);
  660 
  661         /*
  662          * Send it, repeatedly, until a reply is received,
  663          * but delay each re-send by an increasing amount.
  664          * If the delay hits the maximum, start complaining.
  665          */
  666         timo = 0;
  667         rtimo = 0;
  668         for (;;) {
  669 
  670                 outstanding = 0;
  671                 gotrootpath = 0;
  672 
  673                 for (ifctx = gctx->interfaces;
  674                      ifctx != NULL;
  675                      ifctx = ifctx->next) {
  676                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
  677                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
  678                                        ifctx->replylen,
  679                                        TAG_ROOT) != NULL)
  680                                 gotrootpath = 1;
  681                 }
  682 
  683                 for (ifctx = gctx->interfaces;
  684                      ifctx != NULL;
  685                      ifctx = ifctx->next) {
  686                         ifctx->outstanding = 0;
  687                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
  688                             gotrootpath != 0) {
  689                                 continue;
  690                         }
  691                         if (bootpc_ifctx_isfailed(ifctx) != 0)
  692                                 continue;
  693 
  694                         outstanding++;
  695                         ifctx->outstanding = 1;
  696 
  697                         /* Proceed to next step in DHCP negotiation */
  698                         if ((ifctx->state == IF_DHCP_OFFERED &&
  699                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
  700                             (ifctx->state == IF_DHCP_UNRESOLVED &&
  701                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
  702                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
  703                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
  704                                 ifctx->sentmsg = 0;
  705                                 bootpc_compose_query(ifctx, gctx, td);
  706                         }
  707 
  708                         /* Send BOOTP request (or re-send). */
  709 
  710                         if (ifctx->sentmsg == 0) {
  711                                 switch(ifctx->dhcpquerytype) {
  712                                 case DHCP_DISCOVER:
  713                                         s = "DHCP Discover";
  714                                         break;
  715                                 case DHCP_REQUEST:
  716                                         s = "DHCP Request";
  717                                         break;
  718                                 case DHCP_NOMSG:
  719                                 default:
  720                                         s = "BOOTP Query";
  721                                         break;
  722                                 }
  723                                 printf("Sending %s packet from "
  724                                        "interface %s (%*D)\n",
  725                                        s,
  726                                        ifctx->ireq.ifr_name,
  727                                        ifctx->sdl->sdl_alen,
  728                                        (unsigned char *) LLADDR(ifctx->sdl),
  729                                        ":");
  730                                 ifctx->sentmsg = 1;
  731                         }
  732 
  733                         aio.iov_base = (caddr_t) &ifctx->call;
  734                         aio.iov_len = sizeof(ifctx->call);
  735 
  736                         auio.uio_iov = &aio;
  737                         auio.uio_iovcnt = 1;
  738                         auio.uio_segflg = UIO_SYSSPACE;
  739                         auio.uio_rw = UIO_WRITE;
  740                         auio.uio_offset = 0;
  741                         auio.uio_resid = sizeof(ifctx->call);
  742                         auio.uio_td = td;
  743 
  744                         /* Set netmask to 0.0.0.0 */
  745 
  746                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  747                         clear_sinaddr(sin);
  748                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  749                                         (caddr_t) &ifctx->ireq, td);
  750                         if (error != 0)
  751                                 panic("bootpc_call:"
  752                                       "set if netmask, error=%d",
  753                                       error);
  754 
  755                         error = sosend(so, (struct sockaddr *) &dst,
  756                                        &auio, NULL, NULL, 0, td);
  757                         if (error != 0) {
  758                                 printf("bootpc_call: sosend: %d state %08x\n",
  759                                        error, (int) so->so_state);
  760                         }
  761 
  762                         /* XXX: Is this needed ? */
  763                         tsleep(&error, PZERO + 8, "bootpw", 10);
  764 
  765                         /* Set netmask to 255.0.0.0 */
  766 
  767                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  768                         clear_sinaddr(sin);
  769                         sin->sin_addr.s_addr = htonl(0xff000000u);
  770                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  771                                         (caddr_t) &ifctx->ireq, td);
  772                         if (error != 0)
  773                                 panic("bootpc_call:"
  774                                       "set if netmask, error=%d",
  775                                       error);
  776 
  777                 }
  778 
  779                 if (outstanding == 0 &&
  780                     (rtimo == 0 || time_second >= rtimo)) {
  781                         error = 0;
  782                         goto gotreply;
  783                 }
  784 
  785                 /* Determine new timeout. */
  786                 if (timo < MAX_RESEND_DELAY)
  787                         timo++;
  788                 else {
  789                         printf("DHCP/BOOTP timeout for server ");
  790                         print_sin_addr(&dst);
  791                         printf("\n");
  792                 }
  793 
  794                 /*
  795                  * Wait for up to timo seconds for a reply.
  796                  * The socket receive timeout was set to 1 second.
  797                  */
  798                 atimo = timo + time_second;
  799                 while (time_second < atimo) {
  800                         aio.iov_base = (caddr_t) &gctx->reply;
  801                         aio.iov_len = sizeof(gctx->reply);
  802 
  803                         auio.uio_iov = &aio;
  804                         auio.uio_iovcnt = 1;
  805                         auio.uio_segflg = UIO_SYSSPACE;
  806                         auio.uio_rw = UIO_READ;
  807                         auio.uio_offset = 0;
  808                         auio.uio_resid = sizeof(gctx->reply);
  809                         auio.uio_td = td;
  810 
  811                         rcvflg = 0;
  812                         error = soreceive(so, NULL, &auio,
  813                                           NULL, NULL, &rcvflg);
  814                         gctx->secs = time_second - gctx->starttime;
  815                         for (ifctx = gctx->interfaces;
  816                              ifctx != NULL;
  817                              ifctx = ifctx->next) {
  818                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
  819                                     bootpc_ifctx_isfailed(ifctx) != 0)
  820                                         continue;
  821 
  822                                 ifctx->call.secs = htons(gctx->secs);
  823                         }
  824                         if (error == EWOULDBLOCK)
  825                                 continue;
  826                         if (error != 0)
  827                                 goto out;
  828                         len = sizeof(gctx->reply) - auio.uio_resid;
  829 
  830                         /* Do we have the required number of bytes ? */
  831                         if (len < BOOTP_MIN_LEN)
  832                                 continue;
  833                         gctx->replylen = len;
  834 
  835                         /* Is it a reply? */
  836                         if (gctx->reply.op != BOOTP_REPLY)
  837                                 continue;
  838 
  839                         /* Is this an answer to our query */
  840                         for (ifctx = gctx->interfaces;
  841                              ifctx != NULL;
  842                              ifctx = ifctx->next) {
  843                                 if (gctx->reply.xid != ifctx->call.xid)
  844                                         continue;
  845 
  846                                 /* Same HW address size ? */
  847                                 if (gctx->reply.hlen != ifctx->call.hlen)
  848                                         continue;
  849 
  850                                 /* Correct HW address ? */
  851                                 if (bcmp(gctx->reply.chaddr,
  852                                          ifctx->call.chaddr,
  853                                          ifctx->call.hlen) != 0)
  854                                         continue;
  855 
  856                                 break;
  857                         }
  858 
  859                         if (ifctx != NULL) {
  860                                 s =  bootpc_tag(&gctx->tmptag,
  861                                                 &gctx->reply,
  862                                                 gctx->replylen,
  863                                                 TAG_DHCP_MSGTYPE);
  864                                 if (s != NULL) {
  865                                         switch (*s) {
  866                                         case DHCP_OFFER:
  867                                                 s = "DHCP Offer";
  868                                                 break;
  869                                         case DHCP_ACK:
  870                                                 s = "DHCP Ack";
  871                                                 break;
  872                                         default:
  873                                                 s = "DHCP (unexpected)";
  874                                                 break;
  875                                         }
  876                                 } else
  877                                         s = "BOOTP Reply";
  878 
  879                                 printf("Received %s packet"
  880                                        " on %s from ",
  881                                        s,
  882                                        ifctx->ireq.ifr_name);
  883                                 print_in_addr(gctx->reply.siaddr);
  884                                 if (gctx->reply.giaddr.s_addr !=
  885                                     htonl(INADDR_ANY)) {
  886                                         printf(" via ");
  887                                         print_in_addr(gctx->reply.giaddr);
  888                                 }
  889                                 if (bootpc_received(gctx, ifctx) != 0) {
  890                                         printf(" (accepted)");
  891                                         if (ifctx->outstanding) {
  892                                                 ifctx->outstanding = 0;
  893                                                 outstanding--;
  894                                         }
  895                                         /* Network settle delay */
  896                                         if (outstanding == 0)
  897                                                 atimo = time_second +
  898                                                         BOOTP_SETTLE_DELAY;
  899                                 } else
  900                                         printf(" (ignored)");
  901                                 if (ifctx->gotrootpath) {
  902                                         gotrootpath = 1;
  903                                         rtimo = time_second +
  904                                                 BOOTP_SETTLE_DELAY;
  905                                         printf(" (got root path)");
  906                                 } else
  907                                         printf(" (no root path)");
  908                                 printf("\n");
  909                         }
  910                 } /* while secs */
  911 #ifdef BOOTP_TIMEOUT
  912                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
  913                         break;
  914 #endif
  915                 /* Force a retry if halfway in DHCP negotiation */
  916                 retry = 0;
  917                 for (ifctx = gctx->interfaces; ifctx != NULL;
  918                      ifctx = ifctx->next) {
  919                         if (ifctx->state == IF_DHCP_OFFERED) {
  920                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
  921                                         retry = 1;
  922                                 else
  923                                         ifctx->state = IF_DHCP_UNRESOLVED;
  924                         }
  925                 }
  926 
  927                 if (retry != 0)
  928                         continue;
  929 
  930                 if (gotrootpath != 0) {
  931                         gctx->gotrootpath = gotrootpath;
  932                         if (rtimo != 0 && time_second >= rtimo)
  933                                 break;
  934                 }
  935         } /* forever send/receive */
  936 
  937         /*
  938          * XXX: These are errors of varying seriousness being silently
  939          * ignored
  940          */
  941 
  942         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  943                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
  944                         printf("%s timeout for interface %s\n",
  945                                ifctx->dhcpquerytype != DHCP_NOMSG ?
  946                                "DHCP" : "BOOTP",
  947                                ifctx->ireq.ifr_name);
  948                 }
  949         }
  950         if (gctx->gotrootpath != 0) {
  951 #if 0
  952                 printf("Got a root path, ignoring remaining timeout\n");
  953 #endif
  954                 error = 0;
  955                 goto out;
  956         }
  957 #ifndef BOOTP_NFSROOT
  958         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  959                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
  960                         error = 0;
  961                         goto out;
  962                 }
  963         }
  964 #endif
  965         error = ETIMEDOUT;
  966         goto out;
  967 
  968 gotreply:
  969 out:
  970         soclose(so);
  971 out0:
  972         return error;
  973 }
  974 
  975 static int
  976 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  977     struct bootpc_globalcontext *gctx, struct thread *td)
  978 {
  979         struct sockaddr_in *sin;
  980         int error;
  981         struct ifreq *ireq;
  982         struct socket *so;
  983         struct ifaddr *ifa;
  984         struct sockaddr_dl *sdl;
  985 
  986         GIANT_REQUIRED;         /* XXX until socket locking done */
  987 
  988         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
  989         if (error != 0)
  990                 panic("nfs_boot: socreate, error=%d", error);
  991 
  992         ireq = &ifctx->ireq;
  993         so = ifctx->so;
  994 
  995         /*
  996          * Bring up the interface.
  997          *
  998          * Get the old interface flags and or IFF_UP into them; if
  999          * IFF_UP set blindly, interface selection can be clobbered.
 1000          */
 1001         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 1002         if (error != 0)
 1003                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 1004         ireq->ifr_flags |= IFF_UP;
 1005         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
 1006         if (error != 0)
 1007                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
 1008 
 1009         /*
 1010          * Do enough of ifconfig(8) so that the chosen interface
 1011          * can talk to the servers.  (just set the address)
 1012          */
 1013 
 1014         /* addr is 0.0.0.0 */
 1015 
 1016         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1017         clear_sinaddr(sin);
 1018         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1019         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1020                 panic("bootpc_fakeup_interface: "
 1021                       "set if addr, error=%d", error);
 1022 
 1023         /* netmask is 255.0.0.0 */
 1024 
 1025         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1026         clear_sinaddr(sin);
 1027         sin->sin_addr.s_addr = htonl(0xff000000u);
 1028         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
 1029         if (error != 0)
 1030                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
 1031                       error);
 1032 
 1033         /* Broadcast is 255.255.255.255 */
 1034 
 1035         sin = (struct sockaddr_in *)&ireq->ifr_addr;
 1036         clear_sinaddr(sin);
 1037         clear_sinaddr(&ifctx->broadcast);
 1038         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
 1039         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
 1040 
 1041         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
 1042         if (error != 0)
 1043                 panic("bootpc_fakeup_interface: "
 1044                       "set if broadcast addr, error=%d",
 1045                       error);
 1046 
 1047         /* Get HW address */
 1048 
 1049         sdl = NULL;
 1050         for (ifa = TAILQ_FIRST(&ifctx->ifp->if_addrhead);
 1051              ifa != NULL;
 1052              ifa = TAILQ_NEXT(ifa, ifa_link))
 1053                 if (ifa->ifa_addr->sa_family == AF_LINK &&
 1054                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
 1055                     sdl->sdl_type == IFT_ETHER)
 1056                         break;
 1057 
 1058         if (sdl == NULL)
 1059                 panic("bootpc: Unable to find HW address for %s",
 1060                       ifctx->ireq.ifr_name);
 1061         ifctx->sdl = sdl;
 1062 
 1063         return error;
 1064 }
 1065 
 1066 
 1067 static int
 1068 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 1069     struct bootpc_globalcontext *gctx, struct thread *td)
 1070 {
 1071         int error;
 1072         struct sockaddr_in defdst;
 1073         struct sockaddr_in defmask;
 1074         struct sockaddr_in *sin;
 1075         struct ifreq *ireq;
 1076         struct socket *so;
 1077         struct sockaddr_in *myaddr;
 1078         struct sockaddr_in *netmask;
 1079         struct sockaddr_in *gw;
 1080 
 1081         ireq = &ifctx->ireq;
 1082         so = ifctx->so;
 1083         myaddr = &ifctx->myaddr;
 1084         netmask = &ifctx->netmask;
 1085         gw = &ifctx->gw;
 1086 
 1087         if (bootpc_ifctx_isresolved(ifctx) == 0) {
 1088 
 1089                 /* Shutdown interfaces where BOOTP failed */
 1090 
 1091                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
 1092                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 1093                 if (error != 0)
 1094                         panic("bootpc_adjust_interface: "
 1095                               "SIOCGIFFLAGS, error=%d", error);
 1096                 ireq->ifr_flags &= ~IFF_UP;
 1097                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
 1098                 if (error != 0)
 1099                         panic("bootpc_adjust_interface: "
 1100                               "SIOCSIFFLAGS, error=%d", error);
 1101 
 1102                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1103                 clear_sinaddr(sin);
 1104                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
 1105                 if (error != 0 && (error != EEXIST ||
 1106                                    ifctx == gctx->interfaces))
 1107                         panic("bootpc_adjust_interface: "
 1108                               "SIOCDIFADDR, error=%d", error);
 1109 
 1110                 return 0;
 1111         }
 1112 
 1113         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
 1114         /*
 1115          * Do enough of ifconfig(8) so that the chosen interface
 1116          * can talk to the servers.  (just set the address)
 1117          */
 1118         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
 1119         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
 1120         if (error != 0)
 1121                 panic("bootpc_adjust_interface: "
 1122                       "set if netmask, error=%d", error);
 1123 
 1124         /* Broadcast is with host part of IP address all 1's */
 1125 
 1126         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1127         clear_sinaddr(sin);
 1128         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
 1129                 ~ netmask->sin_addr.s_addr;
 1130         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
 1131         if (error != 0)
 1132                 panic("bootpc_adjust_interface: "
 1133                       "set if broadcast addr, error=%d", error);
 1134 
 1135         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
 1136         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1137         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1138                 panic("bootpc_adjust_interface: "
 1139                       "set if addr, error=%d", error);
 1140 
 1141         /* Add new default route */
 1142 
 1143         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
 1144                 clear_sinaddr(&defdst);
 1145                 clear_sinaddr(&defmask);
 1146                 error = rtrequest(RTM_ADD,
 1147                                   (struct sockaddr *) &defdst,
 1148                                   (struct sockaddr *) gw,
 1149                                   (struct sockaddr *) &defmask,
 1150                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL);
 1151                 if (error != 0) {
 1152                         printf("bootpc_adjust_interface: "
 1153                                "add net route, error=%d\n", error);
 1154                         return error;
 1155                 }
 1156         }
 1157 
 1158         return 0;
 1159 }
 1160 
 1161 static int
 1162 setfs(struct sockaddr_in *addr, char *path, char *p,
 1163     const struct in_addr *siaddr)
 1164 {
 1165 
 1166         if (getip(&p, &addr->sin_addr) == 0) {
 1167                 if (siaddr != NULL && *p == '/')
 1168                         bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
 1169                 else
 1170                         return 0;
 1171         } else {
 1172                 if (*p != ':')
 1173                         return 0;
 1174                 p++;
 1175         }
 1176                 
 1177         addr->sin_len = sizeof(struct sockaddr_in);
 1178         addr->sin_family = AF_INET;
 1179 
 1180         strlcpy(path, p, MNAMELEN);
 1181         return 1;
 1182 }
 1183 
 1184 static int
 1185 getip(char **ptr, struct in_addr *addr)
 1186 {
 1187         char *p;
 1188         unsigned int ip;
 1189         int val;
 1190 
 1191         p = *ptr;
 1192         ip = 0;
 1193         if (((val = getdec(&p)) < 0) || (val > 255))
 1194                 return 0;
 1195         ip = val << 24;
 1196         if (*p != '.')
 1197                 return 0;
 1198         p++;
 1199         if (((val = getdec(&p)) < 0) || (val > 255))
 1200                 return 0;
 1201         ip |= (val << 16);
 1202         if (*p != '.')
 1203                 return 0;
 1204         p++;
 1205         if (((val = getdec(&p)) < 0) || (val > 255))
 1206                 return 0;
 1207         ip |= (val << 8);
 1208         if (*p != '.')
 1209                 return 0;
 1210         p++;
 1211         if (((val = getdec(&p)) < 0) || (val > 255))
 1212                 return 0;
 1213         ip |= val;
 1214 
 1215         addr->s_addr = htonl(ip);
 1216         *ptr = p;
 1217         return 1;
 1218 }
 1219 
 1220 static int
 1221 getdec(char **ptr)
 1222 {
 1223         char *p;
 1224         int ret;
 1225 
 1226         p = *ptr;
 1227         ret = 0;
 1228         if ((*p < '') || (*p > '9'))
 1229                 return -1;
 1230         while ((*p >= '') && (*p <= '9')) {
 1231                 ret = ret * 10 + (*p - '');
 1232                 p++;
 1233         }
 1234         *ptr = p;
 1235         return ret;
 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 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 static int
 1286 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
 1287 {
 1288         struct mbuf *m;
 1289         int alignedlen;
 1290 
 1291         m = *mptr;
 1292         alignedlen = ( len + 3 ) & ~3;
 1293 
 1294         if (m->m_len < alignedlen) {
 1295                 m = m_pullup(m, alignedlen);
 1296                 if (m == NULL) {
 1297                         *mptr = NULL;
 1298                         return EBADRPC;
 1299                 }
 1300         }
 1301         bcopy(mtod(m, u_char *), buf, len);
 1302         m_adj(m, alignedlen);
 1303         *mptr = m;
 1304         return 0;
 1305 }
 1306 
 1307 static int
 1308 xdr_int_decode(struct mbuf **mptr, int *iptr)
 1309 {
 1310         u_int32_t i;
 1311 
 1312         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
 1313                 return EBADRPC;
 1314         *iptr = fxdr_unsigned(u_int32_t, i);
 1315         return 0;
 1316 }
 1317 
 1318 static void
 1319 print_sin_addr(struct sockaddr_in *sin)
 1320 {
 1321 
 1322         print_in_addr(sin->sin_addr);
 1323 }
 1324 
 1325 static void
 1326 print_in_addr(struct in_addr addr)
 1327 {
 1328         unsigned int ip;
 1329 
 1330         ip = ntohl(addr.s_addr);
 1331         printf("%d.%d.%d.%d",
 1332                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
 1333 }
 1334 
 1335 static void
 1336 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 1337     struct bootpc_globalcontext *gctx, struct thread *td)
 1338 {
 1339         unsigned char *vendp;
 1340         unsigned char vendor_client[64];
 1341         uint32_t leasetime;
 1342         uint8_t vendor_client_len;
 1343 
 1344         ifctx->gotrootpath = 0;
 1345 
 1346         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
 1347 
 1348         /* bootpc part */
 1349         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
 1350         ifctx->call.htype = 1;                  /* 10mb ethernet */
 1351         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
 1352         ifctx->call.hops = 0;
 1353         if (bootpc_ifctx_isunresolved(ifctx) != 0)
 1354                 ifctx->xid++;
 1355         ifctx->call.xid = txdr_unsigned(ifctx->xid);
 1356         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
 1357 
 1358         vendp = ifctx->call.vend;
 1359         *vendp++ = 99;          /* RFC1048 cookie */
 1360         *vendp++ = 130;
 1361         *vendp++ = 83;
 1362         *vendp++ = 99;
 1363         *vendp++ = TAG_MAXMSGSIZE;
 1364         *vendp++ = 2;
 1365         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
 1366         *vendp++ = sizeof(struct bootp_packet) & 255;
 1367 
 1368         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
 1369                 ostype, MACHINE, osrelease);
 1370         vendor_client_len = strlen(vendor_client);
 1371         *vendp++ = TAG_VENDOR_INDENTIFIER;
 1372         *vendp++ = vendor_client_len;
 1373         memcpy(vendp, vendor_client, vendor_client_len);
 1374         vendp += vendor_client_len;;
 1375         ifctx->dhcpquerytype = DHCP_NOMSG;
 1376         switch (ifctx->state) {
 1377         case IF_DHCP_UNRESOLVED:
 1378                 *vendp++ = TAG_DHCP_MSGTYPE;
 1379                 *vendp++ = 1;
 1380                 *vendp++ = DHCP_DISCOVER;
 1381                 ifctx->dhcpquerytype = DHCP_DISCOVER;
 1382                 ifctx->gotdhcpserver = 0;
 1383                 break;
 1384         case IF_DHCP_OFFERED:
 1385                 *vendp++ = TAG_DHCP_MSGTYPE;
 1386                 *vendp++ = 1;
 1387                 *vendp++ = DHCP_REQUEST;
 1388                 ifctx->dhcpquerytype = DHCP_REQUEST;
 1389                 *vendp++ = TAG_DHCP_REQ_ADDR;
 1390                 *vendp++ = 4;
 1391                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
 1392                 vendp += 4;
 1393                 if (ifctx->gotdhcpserver != 0) {
 1394                         *vendp++ = TAG_DHCP_SERVERID;
 1395                         *vendp++ = 4;
 1396                         memcpy(vendp, &ifctx->dhcpserver, 4);
 1397                         vendp += 4;
 1398                 }
 1399                 *vendp++ = TAG_DHCP_LEASETIME;
 1400                 *vendp++ = 4;
 1401                 leasetime = htonl(300);
 1402                 memcpy(vendp, &leasetime, 4);
 1403                 vendp += 4;
 1404                 break;
 1405         default:
 1406                 break;
 1407         }
 1408         *vendp = TAG_END;
 1409 
 1410         ifctx->call.secs = 0;
 1411         ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
 1412 }
 1413 
 1414 static int
 1415 bootpc_hascookie(struct bootp_packet *bp)
 1416 {
 1417 
 1418         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
 1419                 bp->vend[2] == 83 && bp->vend[3] == 99);
 1420 }
 1421 
 1422 static void
 1423 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 1424     unsigned char *start, int len, int tag)
 1425 {
 1426         unsigned char *j;
 1427         unsigned char *ej;
 1428         unsigned char code;
 1429 
 1430         if (tctx->badtag != 0 || tctx->badopt != 0)
 1431                 return;
 1432 
 1433         j = start;
 1434         ej = j + len;
 1435 
 1436         while (j < ej) {
 1437                 code = *j++;
 1438                 if (code == TAG_PAD)
 1439                         continue;
 1440                 if (code == TAG_END)
 1441                         return;
 1442                 if (j >= ej || j + *j + 1 > ej) {
 1443                         tctx->badopt = 1;
 1444                         return;
 1445                 }
 1446                 len = *j++;
 1447                 if (code == tag) {
 1448                         if (tctx->taglen + len > TAG_MAXLEN) {
 1449                                 tctx->badtag = 1;
 1450                                 return;
 1451                         }
 1452                         tctx->foundopt = 1;
 1453                         if (len > 0)
 1454                                 memcpy(tctx->buf + tctx->taglen,
 1455                                        j, len);
 1456                         tctx->taglen += len;
 1457                 }
 1458                 if (code == TAG_OVERLOAD)
 1459                         tctx->overload = *j;
 1460 
 1461                 j += len;
 1462         }
 1463 }
 1464 
 1465 static unsigned char *
 1466 bootpc_tag(struct bootpc_tagcontext *tctx,
 1467     struct bootp_packet *bp, int len, int tag)
 1468 {
 1469         tctx->overload = 0;
 1470         tctx->badopt = 0;
 1471         tctx->badtag = 0;
 1472         tctx->foundopt = 0;
 1473         tctx->taglen = 0;
 1474 
 1475         if (bootpc_hascookie(bp) == 0)
 1476                 return NULL;
 1477 
 1478         bootpc_tag_helper(tctx, &bp->vend[4],
 1479                           (unsigned char *) bp + len - &bp->vend[4], tag);
 1480 
 1481         if ((tctx->overload & OVERLOAD_FILE) != 0)
 1482                 bootpc_tag_helper(tctx,
 1483                                   (unsigned char *) bp->file,
 1484                                   sizeof(bp->file),
 1485                                   tag);
 1486         if ((tctx->overload & OVERLOAD_SNAME) != 0)
 1487                 bootpc_tag_helper(tctx,
 1488                                   (unsigned char *) bp->sname,
 1489                                   sizeof(bp->sname),
 1490                                   tag);
 1491 
 1492         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
 1493                 return NULL;
 1494         tctx->buf[tctx->taglen] = '\0';
 1495         return tctx->buf;
 1496 }
 1497 
 1498 static void
 1499 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
 1500     struct bootpc_globalcontext *gctx)
 1501 {
 1502         char *p;
 1503         unsigned int ip;
 1504 
 1505         ifctx->gotgw = 0;
 1506         ifctx->gotnetmask = 0;
 1507 
 1508         clear_sinaddr(&ifctx->myaddr);
 1509         clear_sinaddr(&ifctx->netmask);
 1510         clear_sinaddr(&ifctx->gw);
 1511 
 1512         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
 1513 
 1514         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
 1515 
 1516         printf("%s at ", ifctx->ireq.ifr_name);
 1517         print_sin_addr(&ifctx->myaddr);
 1518         printf(" server ");
 1519         print_in_addr(ifctx->reply.siaddr);
 1520 
 1521         ifctx->gw.sin_addr = ifctx->reply.giaddr;
 1522         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
 1523                 printf(" via gateway ");
 1524                 print_in_addr(ifctx->reply.giaddr);
 1525         }
 1526 
 1527         /* This call used for the side effect (overload flag) */
 1528         (void) bootpc_tag(&gctx->tmptag,
 1529                           &ifctx->reply, ifctx->replylen, TAG_END);
 1530 
 1531         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
 1532                 if (ifctx->reply.sname[0] != '\0')
 1533                         printf(" server name %s", ifctx->reply.sname);
 1534         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
 1535                 if (ifctx->reply.file[0] != '\0')
 1536                         printf(" boot file %s", ifctx->reply.file);
 1537 
 1538         printf("\n");
 1539 
 1540         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1541                        TAG_SUBNETMASK);
 1542         if (p != NULL) {
 1543                 if (gctx->tag.taglen != 4)
 1544                         panic("bootpc: subnet mask len is %d",
 1545                               gctx->tag.taglen);
 1546                 bcopy(p, &ifctx->netmask.sin_addr, 4);
 1547                 ifctx->gotnetmask = 1;
 1548                 printf("subnet mask ");
 1549                 print_sin_addr(&ifctx->netmask);
 1550                 printf(" ");
 1551         }
 1552 
 1553         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1554                        TAG_ROUTERS);
 1555         if (p != NULL) {
 1556                 /* Routers */
 1557                 if (gctx->tag.taglen % 4)
 1558                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
 1559                 if (gctx->tag.taglen > 0) {
 1560                         bcopy(p, &ifctx->gw.sin_addr, 4);
 1561                         printf("router ");
 1562                         print_sin_addr(&ifctx->gw);
 1563                         printf(" ");
 1564                         ifctx->gotgw = 1;
 1565                         gctx->gotgw = 1;
 1566                 }
 1567         }
 1568 
 1569         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1570                        TAG_ROOT);
 1571         if (p != NULL) {
 1572                 if (gctx->setrootfs != NULL) {
 1573                         printf("rootfs %s (ignored) ", p);
 1574                 } else  if (setfs(&nd->root_saddr,
 1575                                   nd->root_hostnam, p, &ifctx->reply.siaddr)) {
 1576                         if (*p == '/') {
 1577                                 printf("root_server ");
 1578                                 print_sin_addr(&nd->root_saddr);
 1579                                 printf(" ");
 1580                         }
 1581                         printf("rootfs %s ", p);
 1582                         gctx->gotrootpath = 1;
 1583                         ifctx->gotrootpath = 1;
 1584                         gctx->setrootfs = ifctx;
 1585 
 1586                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
 1587                                        ifctx->replylen,
 1588                                        TAG_ROOTOPTS);
 1589                         if (p != NULL) {
 1590                                 mountopts(&nd->root_args, p);
 1591                                 printf("rootopts %s ", p);
 1592                         }
 1593                 } else
 1594                         panic("Failed to set rootfs to %s", p);
 1595         }
 1596 
 1597         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1598                        TAG_HOSTNAME);
 1599         if (p != NULL) {
 1600                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
 1601                         panic("bootpc: hostname >= %d bytes",
 1602                               MAXHOSTNAMELEN);
 1603                 if (gctx->sethostname != NULL) {
 1604                         printf("hostname %s (ignored) ", p);
 1605                 } else {
 1606                         strcpy(nd->my_hostnam, p);
 1607                         strcpy(hostname, p);
 1608                         printf("hostname %s ", hostname);
 1609                         gctx->sethostname = ifctx;
 1610                 }
 1611         }
 1612         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1613                         TAG_COOKIE);
 1614         if (p != NULL) {        /* store in a sysctl variable */
 1615                 int i, l = sizeof(bootp_cookie) - 1;
 1616                 for (i = 0; i < l && p[i] != '\0'; i++)
 1617                         bootp_cookie[i] = p[i];
 1618                 p[i] = '\0';
 1619         }
 1620 
 1621 
 1622         printf("\n");
 1623 
 1624         if (ifctx->gotnetmask == 0) {
 1625                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1626                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
 1627                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1628                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
 1629                 else
 1630                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
 1631         }
 1632         if (ifctx->gotgw == 0) {
 1633                 /* Use proxyarp */
 1634                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
 1635         }
 1636 }
 1637 
 1638 void
 1639 bootpc_init(void)
 1640 {
 1641         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
 1642         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
 1643         struct ifnet *ifp;
 1644         int error;
 1645 #ifndef BOOTP_WIRED_TO
 1646         int ifcnt;
 1647 #endif
 1648         struct nfsv3_diskless *nd;
 1649         struct thread *td;
 1650 
 1651         nd = &nfsv3_diskless;
 1652         td = curthread;
 1653 
 1654         /*
 1655          * If already filled in, don't touch it here
 1656          */
 1657         if (nfs_diskless_valid != 0)
 1658                 return;
 1659 
 1660         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
 1661         if (gctx == NULL)
 1662                 panic("Failed to allocate bootp global context structure");
 1663 
 1664         gctx->xid = ~0xFFFF;
 1665         gctx->starttime = time_second;
 1666 
 1667         /*
 1668          * Find a network interface.
 1669          */
 1670 #ifdef BOOTP_WIRED_TO
 1671         printf("bootpc_init: wired to interface '%s'\n",
 1672                __XSTRING(BOOTP_WIRED_TO));
 1673         allocifctx(gctx);
 1674 #else
 1675         /*
 1676          * Preallocate interface context storage, if another interface
 1677          * attaches and wins the race, it won't be eligible for bootp.
 1678          */
 1679         IFNET_RLOCK();
 1680         for (ifp = TAILQ_FIRST(&ifnet), ifcnt = 0;
 1681              ifp != NULL;
 1682              ifp = TAILQ_NEXT(ifp, if_link)) {
 1683                 if ((ifp->if_flags &
 1684                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1685                     IFF_BROADCAST)
 1686                         continue;
 1687                 ifcnt++;
 1688         }
 1689         IFNET_RUNLOCK();
 1690         if (ifcnt == 0)
 1691                 panic("bootpc_init: no eligible interfaces");
 1692         for (; ifcnt > 0; ifcnt--)
 1693                 allocifctx(gctx);
 1694 #endif
 1695 
 1696         IFNET_RLOCK();
 1697         for (ifp = TAILQ_FIRST(&ifnet), ifctx = gctx->interfaces;
 1698              ifp != NULL && ifctx != NULL;
 1699              ifp = TAILQ_NEXT(ifp, if_link)) {
 1700                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
 1701                     sizeof(ifctx->ireq.ifr_name));
 1702 #ifdef BOOTP_WIRED_TO
 1703                 if (strcmp(ifctx->ireq.ifr_name,
 1704                            __XSTRING(BOOTP_WIRED_TO)) != 0)
 1705                         continue;
 1706 #else
 1707                 if ((ifp->if_flags &
 1708                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1709                     IFF_BROADCAST)
 1710                         continue;
 1711 #endif
 1712                 ifctx->ifp = ifp;
 1713                 ifctx = ifctx->next;
 1714         }
 1715         IFNET_RUNLOCK();
 1716 
 1717         if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) {
 1718 #ifdef BOOTP_WIRED_TO
 1719                 panic("bootpc_init: Could not find interface specified "
 1720                       "by BOOTP_WIRED_TO: "
 1721                       __XSTRING(BOOTP_WIRED_TO));
 1722 #else
 1723                 panic("bootpc_init: no suitable interface");
 1724 #endif
 1725         }
 1726 
 1727         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1728                 bootpc_fakeup_interface(ifctx, gctx, td);
 1729 
 1730         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1731                 bootpc_compose_query(ifctx, gctx, td);
 1732 
 1733         error = bootpc_call(gctx, td);
 1734 
 1735         if (error != 0) {
 1736 #ifdef BOOTP_NFSROOT
 1737                 panic("BOOTP call failed");
 1738 #else
 1739                 printf("BOOTP call failed\n");
 1740 #endif
 1741         }
 1742 
 1743         rootdevnames[0] = "nfs:";
 1744         mountopts(&nd->root_args, NULL);
 1745 
 1746         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1747                 if (bootpc_ifctx_isresolved(ifctx) != 0)
 1748                         bootpc_decode_reply(nd, ifctx, gctx);
 1749 
 1750 #ifdef BOOTP_NFSROOT
 1751         if (gctx->gotrootpath == 0)
 1752                 panic("bootpc: No root path offered");
 1753 #endif
 1754 
 1755         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 1756                 bootpc_adjust_interface(ifctx, gctx, td);
 1757 
 1758                 soclose(ifctx->so);
 1759         }
 1760 
 1761         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1762                 if (ifctx->gotrootpath != 0)
 1763                         break;
 1764         if (ifctx == NULL) {
 1765                 for (ifctx = gctx->interfaces;
 1766                      ifctx != NULL;
 1767                      ifctx = ifctx->next)
 1768                         if (bootpc_ifctx_isresolved(ifctx) != 0)
 1769                                 break;
 1770         }
 1771         if (ifctx == NULL)
 1772                 goto out;
 1773 
 1774         if (gctx->gotrootpath != 0) {
 1775 
 1776                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
 1777                                  nd->root_fh, &nd->root_fhsize,
 1778                                  &nd->root_args, td);
 1779                 if (error != 0)
 1780                         panic("nfs_boot: mountd root, error=%d", error);
 1781 
 1782                 nfs_diskless_valid = 3;
 1783         }
 1784 
 1785         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
 1786         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
 1787         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
 1788         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
 1789                 ifctx->myaddr.sin_addr.s_addr |
 1790                 ~ ifctx->netmask.sin_addr.s_addr;
 1791         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
 1792 
 1793 out:
 1794         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
 1795                 nctx = ifctx->next;
 1796                 free(ifctx, M_TEMP);
 1797         }
 1798         free(gctx, M_TEMP);
 1799 }
 1800 
 1801 /*
 1802  * RPC: mountd/mount
 1803  * Given a server pathname, get an NFS file handle.
 1804  * Also, sets sin->sin_port to the NFS service port.
 1805  */
 1806 static int
 1807 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
 1808     struct nfs_args *args, struct thread *td)
 1809 {
 1810         struct mbuf *m;
 1811         int error;
 1812         int authunixok;
 1813         int authcount;
 1814         int authver;
 1815 
 1816 #ifdef BOOTP_NFSV3
 1817         /* First try NFS v3 */
 1818         /* Get port number for MOUNTD. */
 1819         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1820                              &mdsin->sin_port, td);
 1821         if (error == 0) {
 1822                 m = xdr_string_encode(path, strlen(path));
 1823 
 1824                 /* Do RPC to mountd. */
 1825                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1826                                   RPCMNT_MOUNT, &m, NULL, td);
 1827         }
 1828         if (error == 0) {
 1829                 args->flags |= NFSMNT_NFSV3;
 1830         } else {
 1831 #endif
 1832                 /* Fallback to NFS v2 */
 1833 
 1834                 /* Get port number for MOUNTD. */
 1835                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1836                                      &mdsin->sin_port, td);
 1837                 if (error != 0)
 1838                         return error;
 1839 
 1840                 m = xdr_string_encode(path, strlen(path));
 1841 
 1842                 /* Do RPC to mountd. */
 1843                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1844                                   RPCMNT_MOUNT, &m, NULL, td);
 1845                 if (error != 0)
 1846                         return error;   /* message already freed */
 1847 
 1848 #ifdef BOOTP_NFSV3
 1849         }
 1850 #endif
 1851 
 1852         if (xdr_int_decode(&m, &error) != 0 || error != 0)
 1853                 goto bad;
 1854 
 1855         if ((args->flags & NFSMNT_NFSV3) != 0) {
 1856                 if (xdr_int_decode(&m, fhsizep) != 0 ||
 1857                     *fhsizep > NFSX_V3FHMAX ||
 1858                     *fhsizep <= 0)
 1859                         goto bad;
 1860         } else
 1861                 *fhsizep = NFSX_V2FH;
 1862 
 1863         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
 1864                 goto bad;
 1865 
 1866         if (args->flags & NFSMNT_NFSV3) {
 1867                 if (xdr_int_decode(&m, &authcount) != 0)
 1868                         goto bad;
 1869                 authunixok = 0;
 1870                 if (authcount < 0 || authcount > 100)
 1871                         goto bad;
 1872                 while (authcount > 0) {
 1873                         if (xdr_int_decode(&m, &authver) != 0)
 1874                                 goto bad;
 1875                         if (authver == RPCAUTH_UNIX)
 1876                                 authunixok = 1;
 1877                         authcount--;
 1878                 }
 1879                 if (authunixok == 0)
 1880                         goto bad;
 1881         }
 1882 
 1883         /* Set port number for NFS use. */
 1884         error = krpc_portmap(mdsin, NFS_PROG,
 1885                              (args->flags &
 1886                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
 1887                              &mdsin->sin_port, td);
 1888 
 1889         goto out;
 1890 
 1891 bad:
 1892         error = EBADRPC;
 1893 
 1894 out:
 1895         m_freem(m);
 1896         return error;
 1897 }
 1898 
 1899 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);

Cache object: db3b182278555505bcea67e06933f64c


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