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/8.0/sys/nfsclient/bootp_subr.c 196626 2009-08-28 20:06:02Z rwatson $");
   45 
   46 #include "opt_bootp.h"
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/jail.h>
   51 #include <sys/kernel.h>
   52 #include <sys/sockio.h>
   53 #include <sys/malloc.h>
   54 #include <sys/mount.h>
   55 #include <sys/mbuf.h>
   56 #include <sys/proc.h>
   57 #include <sys/socket.h>
   58 #include <sys/socketvar.h>
   59 #include <sys/sysctl.h>
   60 #include <sys/uio.h>
   61 
   62 #include <net/if.h>
   63 #include <net/route.h>
   64 
   65 #include <netinet/in.h>
   66 #include <net/if_types.h>
   67 #include <net/if_dl.h>
   68 #include <net/vnet.h>
   69 
   70 #include <nfs/nfsproto.h>
   71 #include <nfsclient/nfs.h>
   72 #include <nfsclient/nfsdiskless.h>
   73 #include <nfsclient/krpc.h>
   74 #include <nfs/xdr_subs.h>
   75 
   76 
   77 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
   78 
   79 #ifndef BOOTP_SETTLE_DELAY
   80 #define BOOTP_SETTLE_DELAY 3
   81 #endif
   82 
   83 /*
   84  * What is the longest we will wait before re-sending a request?
   85  * Note this is also the frequency of "RPC timeout" messages.
   86  * The re-send loop count sup linearly to this maximum, so the
   87  * first complaint will happen after (1+2+3+4+5)=15 seconds.
   88  */
   89 #define MAX_RESEND_DELAY 5      /* seconds */
   90 
   91 /* Definitions from RFC951 */
   92 struct bootp_packet {
   93         u_int8_t op;
   94         u_int8_t htype;
   95         u_int8_t hlen;
   96         u_int8_t hops;
   97         u_int32_t xid;
   98         u_int16_t secs;
   99         u_int16_t flags;
  100         struct in_addr ciaddr;
  101         struct in_addr yiaddr;
  102         struct in_addr siaddr;
  103         struct in_addr giaddr;
  104         unsigned char chaddr[16];
  105         char sname[64];
  106         char file[128];
  107         unsigned char vend[1222];
  108 };
  109 
  110 struct bootpc_ifcontext {
  111         struct bootpc_ifcontext *next;
  112         struct bootp_packet call;
  113         struct bootp_packet reply;
  114         int replylen;
  115         int overload;
  116         struct socket *so;
  117         struct ifreq ireq;
  118         struct ifnet *ifp;
  119         struct sockaddr_dl *sdl;
  120         struct sockaddr_in myaddr;
  121         struct sockaddr_in netmask;
  122         struct sockaddr_in gw;
  123         struct sockaddr_in broadcast;   /* Different for each interface */
  124         int gotgw;
  125         int gotnetmask;
  126         int gotrootpath;
  127         int outstanding;
  128         int sentmsg;
  129         u_int32_t xid;
  130         enum {
  131                 IF_BOOTP_UNRESOLVED,
  132                 IF_BOOTP_RESOLVED,
  133                 IF_BOOTP_FAILED,
  134                 IF_DHCP_UNRESOLVED,
  135                 IF_DHCP_OFFERED,
  136                 IF_DHCP_RESOLVED,
  137                 IF_DHCP_FAILED,
  138         } state;
  139         int dhcpquerytype;              /* dhcp type sent */
  140         struct in_addr dhcpserver;
  141         int gotdhcpserver;
  142 };
  143 
  144 #define TAG_MAXLEN 1024
  145 struct bootpc_tagcontext {
  146         char buf[TAG_MAXLEN + 1];
  147         int overload;
  148         int badopt;
  149         int badtag;
  150         int foundopt;
  151         int taglen;
  152 };
  153 
  154 struct bootpc_globalcontext {
  155         struct bootpc_ifcontext *interfaces;
  156         struct bootpc_ifcontext *lastinterface;
  157         u_int32_t xid;
  158         int gotrootpath;
  159         int gotgw;
  160         int ifnum;
  161         int secs;
  162         int starttime;
  163         struct bootp_packet reply;
  164         int replylen;
  165         struct bootpc_ifcontext *setrootfs;
  166         struct bootpc_ifcontext *sethostname;
  167         struct bootpc_tagcontext tmptag;
  168         struct bootpc_tagcontext tag;
  169 };
  170 
  171 #define IPPORT_BOOTPC 68
  172 #define IPPORT_BOOTPS 67
  173 
  174 #define BOOTP_REQUEST 1
  175 #define BOOTP_REPLY 2
  176 
  177 /* Common tags */
  178 #define TAG_PAD           0  /* Pad option, implicit length 1 */
  179 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
  180 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
  181 #define TAG_HOSTNAME     12  /* Client host name */
  182 #define TAG_ROOT         17  /* Root path */
  183 
  184 /* DHCP specific tags */
  185 #define TAG_OVERLOAD     52  /* Option Overload */
  186 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
  187 
  188 #define TAG_END         255  /* End Option (i.e. no more options) */
  189 
  190 /* Overload values */
  191 #define OVERLOAD_FILE     1
  192 #define OVERLOAD_SNAME    2
  193 
  194 /* Site specific tags: */
  195 #define TAG_ROOTOPTS    130
  196 #define TAG_COOKIE      134     /* ascii info for userland, via sysctl */
  197 
  198 #define TAG_DHCP_MSGTYPE 53
  199 #define TAG_DHCP_REQ_ADDR 50
  200 #define TAG_DHCP_SERVERID 54
  201 #define TAG_DHCP_LEASETIME 51
  202 
  203 #define TAG_VENDOR_INDENTIFIER 60
  204 
  205 #define DHCP_NOMSG    0
  206 #define DHCP_DISCOVER 1
  207 #define DHCP_OFFER    2
  208 #define DHCP_REQUEST  3
  209 #define DHCP_ACK      5
  210 
  211 /* NFS read/write block size */
  212 #ifndef BOOTP_BLOCKSIZE
  213 #define BOOTP_BLOCKSIZE 8192
  214 #endif
  215 
  216 static char bootp_cookie[128];
  217 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
  218         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
  219 
  220 /* mountd RPC */
  221 static int      md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp,
  222                     int *fhsizep, struct nfs_args *args, struct thread *td);
  223 static int      setfs(struct sockaddr_in *addr, char *path, char *p,
  224                     const struct in_addr *siaddr);
  225 static int      getdec(char **ptr);
  226 static int      getip(char **ptr, struct in_addr *ip);
  227 static void     mountopts(struct nfs_args *args, char *p);
  228 static int      xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len);
  229 static int      xdr_int_decode(struct mbuf **ptr, int *iptr);
  230 static void     print_in_addr(struct in_addr addr);
  231 static void     print_sin_addr(struct sockaddr_in *addr);
  232 static void     clear_sinaddr(struct sockaddr_in *sin);
  233 static void     allocifctx(struct bootpc_globalcontext *gctx);
  234 static void     bootpc_compose_query(struct bootpc_ifcontext *ifctx,
  235                     struct bootpc_globalcontext *gctx, struct thread *td);
  236 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
  237                     struct bootp_packet *bp, int len, int tag);
  238 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
  239                     unsigned char *start, int len, int tag);
  240 
  241 #ifdef BOOTP_DEBUG
  242 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma);
  243 void bootpboot_p_rtentry(struct rtentry *rt);
  244 void bootpboot_p_tree(struct radix_node *rn);
  245 void bootpboot_p_rtlist(void);
  246 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
  247 void bootpboot_p_iflist(void);
  248 #endif
  249 
  250 static int      bootpc_call(struct bootpc_globalcontext *gctx,
  251                     struct thread *td);
  252 
  253 static int      bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  254                     struct bootpc_globalcontext *gctx, struct thread *td);
  255 
  256 static int      bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
  257                     struct bootpc_globalcontext *gctx, struct thread *td);
  258 
  259 static void     bootpc_decode_reply(struct nfsv3_diskless *nd,
  260                     struct bootpc_ifcontext *ifctx,
  261                     struct bootpc_globalcontext *gctx);
  262 
  263 static int      bootpc_received(struct bootpc_globalcontext *gctx,
  264                     struct bootpc_ifcontext *ifctx);
  265 
  266 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
  267 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
  268 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
  269 
  270 /*
  271  * In order to have multiple active interfaces with address 0.0.0.0
  272  * and be able to send data to a selected interface, we perform
  273  * some tricks:
  274  *
  275  *  - The 'broadcast' address is different for each interface.
  276  *
  277  *  - We temporarily add routing pointing 255.255.255.255 to the
  278  *    selected interface broadcast address, thus the packet sent
  279  *    goes to that interface.
  280  */
  281 
  282 #ifdef BOOTP_DEBUG
  283 void
  284 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
  285 {
  286 
  287         if (sa == NULL) {
  288                 printf("(sockaddr *) <null>");
  289                 return;
  290         }
  291         switch (sa->sa_family) {
  292         case AF_INET:
  293         {
  294                 struct sockaddr_in *sin;
  295 
  296                 sin = (struct sockaddr_in *) sa;
  297                 printf("inet ");
  298                 print_sin_addr(sin);
  299                 if (ma != NULL) {
  300                         sin = (struct sockaddr_in *) ma;
  301                         printf(" mask ");
  302                         print_sin_addr(sin);
  303                 }
  304         }
  305         break;
  306         case AF_LINK:
  307         {
  308                 struct sockaddr_dl *sli;
  309                 int i;
  310 
  311                 sli = (struct sockaddr_dl *) sa;
  312                 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
  313                 for (i = 0; i < sli->sdl_alen; i++) {
  314                         if (i > 0)
  315                                 printf(":");
  316                         printf("%x", ((unsigned char *) LLADDR(sli))[i]);
  317                 }
  318         }
  319         break;
  320         default:
  321                 printf("af%d", sa->sa_family);
  322         }
  323 }
  324 
  325 void
  326 bootpboot_p_rtentry(struct rtentry *rt)
  327 {
  328 
  329         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
  330         printf(" ");
  331         bootpboot_p_sa(rt->rt_gateway, NULL);
  332         printf(" ");
  333         printf("flags %x", (unsigned short) rt->rt_flags);
  334         printf(" %d", (int) rt->rt_rmx.rmx_expire);
  335         printf(" %s\n", rt->rt_ifp->if_xname);
  336 }
  337 
  338 void
  339 bootpboot_p_tree(struct radix_node *rn)
  340 {
  341 
  342         while (rn != NULL) {
  343                 if (rn->rn_bit < 0) {
  344                         if ((rn->rn_flags & RNF_ROOT) != 0) {
  345                         } else {
  346                                 bootpboot_p_rtentry((struct rtentry *) rn);
  347                         }
  348                         rn = rn->rn_dupedkey;
  349                 } else {
  350                         bootpboot_p_tree(rn->rn_left);
  351                         bootpboot_p_tree(rn->rn_right);
  352                         return;
  353                 }
  354         }
  355 }
  356 
  357 void
  358 bootpboot_p_rtlist(void)
  359 {
  360         struct radix_node_head *rnh;
  361 
  362         printf("Routing table:\n");
  363         rnh = rt_tables_get_rnh(0, AF_INET);
  364         if (rnh == NULL)
  365                 return;
  366         RADIX_NODE_HEAD_RLOCK(rnh);     /* could sleep XXX */
  367         bootpboot_p_tree(rnh->rnh_treetop);
  368         RADIX_NODE_HEAD_RUNLOCK(rnh);
  369 }
  370 
  371 void
  372 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
  373 {
  374 
  375         printf("%s flags %x, addr ",
  376                ifp->if_xname, ifp->if_flags);
  377         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
  378         printf(", broadcast ");
  379         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
  380         printf(", netmask ");
  381         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
  382         printf("\n");
  383 }
  384 
  385 void
  386 bootpboot_p_iflist(void)
  387 {
  388         struct ifnet *ifp;
  389         struct ifaddr *ifa;
  390 
  391         printf("Interface list:\n");
  392         IFNET_RLOCK();
  393         for (ifp = TAILQ_FIRST(&V_ifnet);
  394              ifp != NULL;
  395              ifp = TAILQ_NEXT(ifp, if_link)) {
  396                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead);
  397                      ifa != NULL;
  398                      ifa = TAILQ_NEXT(ifa, ifa_link))
  399                         if (ifa->ifa_addr->sa_family == AF_INET)
  400                                 bootpboot_p_if(ifp, ifa);
  401         }
  402         IFNET_RUNLOCK();
  403 }
  404 #endif /* defined(BOOTP_DEBUG) */
  405 
  406 static void
  407 clear_sinaddr(struct sockaddr_in *sin)
  408 {
  409 
  410         bzero(sin, sizeof(*sin));
  411         sin->sin_len = sizeof(*sin);
  412         sin->sin_family = AF_INET;
  413         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
  414         sin->sin_port = 0;
  415 }
  416 
  417 static void
  418 allocifctx(struct bootpc_globalcontext *gctx)
  419 {
  420         struct bootpc_ifcontext *ifctx;
  421         ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx),
  422                                                    M_TEMP, M_WAITOK | M_ZERO);
  423         if (ifctx == NULL)
  424                 panic("Failed to allocate bootp interface context structure");
  425 
  426         ifctx->xid = gctx->xid;
  427 #ifdef BOOTP_NO_DHCP
  428         ifctx->state = IF_BOOTP_UNRESOLVED;
  429 #else
  430         ifctx->state = IF_DHCP_UNRESOLVED;
  431 #endif
  432         gctx->xid += 0x100;
  433         if (gctx->interfaces != NULL)
  434                 gctx->lastinterface->next = ifctx;
  435         else
  436                 gctx->interfaces = ifctx;
  437         gctx->lastinterface = ifctx;
  438 }
  439 
  440 static __inline int
  441 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
  442 {
  443 
  444         if (ifctx->state == IF_BOOTP_RESOLVED ||
  445             ifctx->state == IF_DHCP_RESOLVED)
  446                 return 1;
  447         return 0;
  448 }
  449 
  450 static __inline int
  451 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
  452 {
  453 
  454         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
  455             ifctx->state == IF_DHCP_UNRESOLVED)
  456                 return 1;
  457         return 0;
  458 }
  459 
  460 static __inline int
  461 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
  462 {
  463 
  464         if (ifctx->state == IF_BOOTP_FAILED ||
  465             ifctx->state == IF_DHCP_FAILED)
  466                 return 1;
  467         return 0;
  468 }
  469 
  470 static int
  471 bootpc_received(struct bootpc_globalcontext *gctx,
  472     struct bootpc_ifcontext *ifctx)
  473 {
  474         unsigned char dhcpreplytype;
  475         char *p;
  476 
  477         /*
  478          * Need timeout for fallback to less
  479          * desirable alternative.
  480          */
  481 
  482         /* This call used for the side effect (badopt flag) */
  483         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
  484                           gctx->replylen,
  485                           TAG_END);
  486 
  487         /* If packet is invalid, ignore it */
  488         if (gctx->tmptag.badopt != 0)
  489                 return 0;
  490 
  491         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
  492                        gctx->replylen, TAG_DHCP_MSGTYPE);
  493         if (p != NULL)
  494                 dhcpreplytype = *p;
  495         else
  496                 dhcpreplytype = DHCP_NOMSG;
  497 
  498         switch (ifctx->dhcpquerytype) {
  499         case DHCP_DISCOVER:
  500                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
  501 #ifndef BOOTP_FORCE_DHCP
  502                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
  503 #endif
  504                         )
  505                         return 0;
  506                 break;
  507         case DHCP_REQUEST:
  508                 if (dhcpreplytype != DHCP_ACK)
  509                         return 0;
  510         case DHCP_NOMSG:
  511                 break;
  512         }
  513 
  514         /* Ignore packet unless it gives us a root tag we didn't have */
  515 
  516         if ((ifctx->state == IF_BOOTP_RESOLVED ||
  517              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  518               (ifctx->state == IF_DHCP_OFFERED ||
  519                ifctx->state == IF_DHCP_RESOLVED))) &&
  520             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  521                         ifctx->replylen,
  522                         TAG_ROOT) != NULL ||
  523              bootpc_tag(&gctx->tmptag, &gctx->reply,
  524                         gctx->replylen,
  525                         TAG_ROOT) == NULL))
  526                 return 0;
  527 
  528         bcopy(&gctx->reply, &ifctx->reply, gctx->replylen);
  529         ifctx->replylen = gctx->replylen;
  530 
  531         /* XXX: Only reset if 'perfect' response */
  532         if (ifctx->state == IF_BOOTP_UNRESOLVED)
  533                 ifctx->state = IF_BOOTP_RESOLVED;
  534         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
  535                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
  536                 if (dhcpreplytype == DHCP_OFFER)
  537                         ifctx->state = IF_DHCP_OFFERED;
  538                 else
  539                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
  540         } else if (ifctx->state == IF_DHCP_OFFERED &&
  541                    ifctx->dhcpquerytype == DHCP_REQUEST)
  542                 ifctx->state = IF_DHCP_RESOLVED;
  543 
  544 
  545         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
  546             ifctx->state != IF_BOOTP_RESOLVED) {
  547                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
  548                                ifctx->replylen, TAG_DHCP_SERVERID);
  549                 if (p != NULL && gctx->tmptag.taglen == 4) {
  550                         memcpy(&ifctx->dhcpserver, p, 4);
  551                         ifctx->gotdhcpserver = 1;
  552                 } else
  553                         ifctx->gotdhcpserver = 0;
  554                 return 1;
  555         }
  556 
  557         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  558                                          ifctx->replylen,
  559                                          TAG_ROOT) != NULL);
  560         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  561                                    ifctx->replylen,
  562                                    TAG_ROUTERS) != NULL);
  563         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
  564                                         ifctx->replylen,
  565                                         TAG_SUBNETMASK) != NULL);
  566         return 1;
  567 }
  568 
  569 static int
  570 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
  571 {
  572         struct socket *so;
  573         struct sockaddr_in *sin, dst;
  574         struct uio auio;
  575         struct sockopt sopt;
  576         struct iovec aio;
  577         int error, on, rcvflg, timo, len;
  578         time_t atimo;
  579         time_t rtimo;
  580         struct timeval tv;
  581         struct bootpc_ifcontext *ifctx;
  582         int outstanding;
  583         int gotrootpath;
  584         int retry;
  585         const char *s;
  586 
  587         /*
  588          * Create socket and set its recieve timeout.
  589          */
  590         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td);
  591         if (error != 0)
  592                 goto out0;
  593 
  594         tv.tv_sec = 1;
  595         tv.tv_usec = 0;
  596         bzero(&sopt, sizeof(sopt));
  597         sopt.sopt_dir = SOPT_SET;
  598         sopt.sopt_level = SOL_SOCKET;
  599         sopt.sopt_name = SO_RCVTIMEO;
  600         sopt.sopt_val = &tv;
  601         sopt.sopt_valsize = sizeof tv;
  602 
  603         error = sosetopt(so, &sopt);
  604         if (error != 0)
  605                 goto out;
  606 
  607         /*
  608          * Enable broadcast.
  609          */
  610         on = 1;
  611         sopt.sopt_name = SO_BROADCAST;
  612         sopt.sopt_val = &on;
  613         sopt.sopt_valsize = sizeof on;
  614 
  615         error = sosetopt(so, &sopt);
  616         if (error != 0)
  617                 goto out;
  618 
  619         /*
  620          * Disable routing.
  621          */
  622 
  623         on = 1;
  624         sopt.sopt_name = SO_DONTROUTE;
  625         sopt.sopt_val = &on;
  626         sopt.sopt_valsize = sizeof on;
  627 
  628         error = sosetopt(so, &sopt);
  629         if (error != 0)
  630                 goto out;
  631 
  632         /*
  633          * Bind the local endpoint to a bootp client port.
  634          */
  635         sin = &dst;
  636         clear_sinaddr(sin);
  637         sin->sin_port = htons(IPPORT_BOOTPC);
  638         error = sobind(so, (struct sockaddr *)sin, td);
  639         if (error != 0) {
  640                 printf("bind failed\n");
  641                 goto out;
  642         }
  643 
  644         /*
  645          * Setup socket address for the server.
  646          */
  647         sin = &dst;
  648         clear_sinaddr(sin);
  649         sin->sin_addr.s_addr = INADDR_BROADCAST;
  650         sin->sin_port = htons(IPPORT_BOOTPS);
  651 
  652         /*
  653          * Send it, repeatedly, until a reply is received,
  654          * but delay each re-send by an increasing amount.
  655          * If the delay hits the maximum, start complaining.
  656          */
  657         timo = 0;
  658         rtimo = 0;
  659         for (;;) {
  660 
  661                 outstanding = 0;
  662                 gotrootpath = 0;
  663 
  664                 for (ifctx = gctx->interfaces;
  665                      ifctx != NULL;
  666                      ifctx = ifctx->next) {
  667                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
  668                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
  669                                        ifctx->replylen,
  670                                        TAG_ROOT) != NULL)
  671                                 gotrootpath = 1;
  672                 }
  673 
  674                 for (ifctx = gctx->interfaces;
  675                      ifctx != NULL;
  676                      ifctx = ifctx->next) {
  677                         ifctx->outstanding = 0;
  678                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
  679                             gotrootpath != 0) {
  680                                 continue;
  681                         }
  682                         if (bootpc_ifctx_isfailed(ifctx) != 0)
  683                                 continue;
  684 
  685                         outstanding++;
  686                         ifctx->outstanding = 1;
  687 
  688                         /* Proceed to next step in DHCP negotiation */
  689                         if ((ifctx->state == IF_DHCP_OFFERED &&
  690                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
  691                             (ifctx->state == IF_DHCP_UNRESOLVED &&
  692                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
  693                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
  694                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
  695                                 ifctx->sentmsg = 0;
  696                                 bootpc_compose_query(ifctx, gctx, td);
  697                         }
  698 
  699                         /* Send BOOTP request (or re-send). */
  700 
  701                         if (ifctx->sentmsg == 0) {
  702                                 switch(ifctx->dhcpquerytype) {
  703                                 case DHCP_DISCOVER:
  704                                         s = "DHCP Discover";
  705                                         break;
  706                                 case DHCP_REQUEST:
  707                                         s = "DHCP Request";
  708                                         break;
  709                                 case DHCP_NOMSG:
  710                                 default:
  711                                         s = "BOOTP Query";
  712                                         break;
  713                                 }
  714                                 printf("Sending %s packet from "
  715                                        "interface %s (%*D)\n",
  716                                        s,
  717                                        ifctx->ireq.ifr_name,
  718                                        ifctx->sdl->sdl_alen,
  719                                        (unsigned char *) LLADDR(ifctx->sdl),
  720                                        ":");
  721                                 ifctx->sentmsg = 1;
  722                         }
  723 
  724                         aio.iov_base = (caddr_t) &ifctx->call;
  725                         aio.iov_len = sizeof(ifctx->call);
  726 
  727                         auio.uio_iov = &aio;
  728                         auio.uio_iovcnt = 1;
  729                         auio.uio_segflg = UIO_SYSSPACE;
  730                         auio.uio_rw = UIO_WRITE;
  731                         auio.uio_offset = 0;
  732                         auio.uio_resid = sizeof(ifctx->call);
  733                         auio.uio_td = td;
  734 
  735                         /* Set netmask to 0.0.0.0 */
  736 
  737                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  738                         clear_sinaddr(sin);
  739                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  740                                         (caddr_t) &ifctx->ireq, td);
  741                         if (error != 0)
  742                                 panic("bootpc_call:"
  743                                       "set if netmask, error=%d",
  744                                       error);
  745 
  746                         error = sosend(so, (struct sockaddr *) &dst,
  747                                        &auio, NULL, NULL, 0, td);
  748                         if (error != 0) {
  749                                 printf("bootpc_call: sosend: %d state %08x\n",
  750                                        error, (int) so->so_state);
  751                         }
  752 
  753                         /* XXX: Is this needed ? */
  754                         pause("bootpw", hz/10);
  755 
  756                         /* Set netmask to 255.0.0.0 */
  757 
  758                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
  759                         clear_sinaddr(sin);
  760                         sin->sin_addr.s_addr = htonl(0xff000000u);
  761                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
  762                                         (caddr_t) &ifctx->ireq, td);
  763                         if (error != 0)
  764                                 panic("bootpc_call:"
  765                                       "set if netmask, error=%d",
  766                                       error);
  767 
  768                 }
  769 
  770                 if (outstanding == 0 &&
  771                     (rtimo == 0 || time_second >= rtimo)) {
  772                         error = 0;
  773                         goto gotreply;
  774                 }
  775 
  776                 /* Determine new timeout. */
  777                 if (timo < MAX_RESEND_DELAY)
  778                         timo++;
  779                 else {
  780                         printf("DHCP/BOOTP timeout for server ");
  781                         print_sin_addr(&dst);
  782                         printf("\n");
  783                 }
  784 
  785                 /*
  786                  * Wait for up to timo seconds for a reply.
  787                  * The socket receive timeout was set to 1 second.
  788                  */
  789                 atimo = timo + time_second;
  790                 while (time_second < atimo) {
  791                         aio.iov_base = (caddr_t) &gctx->reply;
  792                         aio.iov_len = sizeof(gctx->reply);
  793 
  794                         auio.uio_iov = &aio;
  795                         auio.uio_iovcnt = 1;
  796                         auio.uio_segflg = UIO_SYSSPACE;
  797                         auio.uio_rw = UIO_READ;
  798                         auio.uio_offset = 0;
  799                         auio.uio_resid = sizeof(gctx->reply);
  800                         auio.uio_td = td;
  801 
  802                         rcvflg = 0;
  803                         error = soreceive(so, NULL, &auio,
  804                                           NULL, NULL, &rcvflg);
  805                         gctx->secs = time_second - gctx->starttime;
  806                         for (ifctx = gctx->interfaces;
  807                              ifctx != NULL;
  808                              ifctx = ifctx->next) {
  809                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
  810                                     bootpc_ifctx_isfailed(ifctx) != 0)
  811                                         continue;
  812 
  813                                 ifctx->call.secs = htons(gctx->secs);
  814                         }
  815                         if (error == EWOULDBLOCK)
  816                                 continue;
  817                         if (error != 0)
  818                                 goto out;
  819                         len = sizeof(gctx->reply) - auio.uio_resid;
  820 
  821                         /* Do we have the required number of bytes ? */
  822                         if (len < BOOTP_MIN_LEN)
  823                                 continue;
  824                         gctx->replylen = len;
  825 
  826                         /* Is it a reply? */
  827                         if (gctx->reply.op != BOOTP_REPLY)
  828                                 continue;
  829 
  830                         /* Is this an answer to our query */
  831                         for (ifctx = gctx->interfaces;
  832                              ifctx != NULL;
  833                              ifctx = ifctx->next) {
  834                                 if (gctx->reply.xid != ifctx->call.xid)
  835                                         continue;
  836 
  837                                 /* Same HW address size ? */
  838                                 if (gctx->reply.hlen != ifctx->call.hlen)
  839                                         continue;
  840 
  841                                 /* Correct HW address ? */
  842                                 if (bcmp(gctx->reply.chaddr,
  843                                          ifctx->call.chaddr,
  844                                          ifctx->call.hlen) != 0)
  845                                         continue;
  846 
  847                                 break;
  848                         }
  849 
  850                         if (ifctx != NULL) {
  851                                 s =  bootpc_tag(&gctx->tmptag,
  852                                                 &gctx->reply,
  853                                                 gctx->replylen,
  854                                                 TAG_DHCP_MSGTYPE);
  855                                 if (s != NULL) {
  856                                         switch (*s) {
  857                                         case DHCP_OFFER:
  858                                                 s = "DHCP Offer";
  859                                                 break;
  860                                         case DHCP_ACK:
  861                                                 s = "DHCP Ack";
  862                                                 break;
  863                                         default:
  864                                                 s = "DHCP (unexpected)";
  865                                                 break;
  866                                         }
  867                                 } else
  868                                         s = "BOOTP Reply";
  869 
  870                                 printf("Received %s packet"
  871                                        " on %s from ",
  872                                        s,
  873                                        ifctx->ireq.ifr_name);
  874                                 print_in_addr(gctx->reply.siaddr);
  875                                 if (gctx->reply.giaddr.s_addr !=
  876                                     htonl(INADDR_ANY)) {
  877                                         printf(" via ");
  878                                         print_in_addr(gctx->reply.giaddr);
  879                                 }
  880                                 if (bootpc_received(gctx, ifctx) != 0) {
  881                                         printf(" (accepted)");
  882                                         if (ifctx->outstanding) {
  883                                                 ifctx->outstanding = 0;
  884                                                 outstanding--;
  885                                         }
  886                                         /* Network settle delay */
  887                                         if (outstanding == 0)
  888                                                 atimo = time_second +
  889                                                         BOOTP_SETTLE_DELAY;
  890                                 } else
  891                                         printf(" (ignored)");
  892                                 if (ifctx->gotrootpath) {
  893                                         gotrootpath = 1;
  894                                         rtimo = time_second +
  895                                                 BOOTP_SETTLE_DELAY;
  896                                         printf(" (got root path)");
  897                                 } else
  898                                         printf(" (no root path)");
  899                                 printf("\n");
  900                         }
  901                 } /* while secs */
  902 #ifdef BOOTP_TIMEOUT
  903                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
  904                         break;
  905 #endif
  906                 /* Force a retry if halfway in DHCP negotiation */
  907                 retry = 0;
  908                 for (ifctx = gctx->interfaces; ifctx != NULL;
  909                      ifctx = ifctx->next) {
  910                         if (ifctx->state == IF_DHCP_OFFERED) {
  911                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
  912                                         retry = 1;
  913                                 else
  914                                         ifctx->state = IF_DHCP_UNRESOLVED;
  915                         }
  916                 }
  917 
  918                 if (retry != 0)
  919                         continue;
  920 
  921                 if (gotrootpath != 0) {
  922                         gctx->gotrootpath = gotrootpath;
  923                         if (rtimo != 0 && time_second >= rtimo)
  924                                 break;
  925                 }
  926         } /* forever send/receive */
  927 
  928         /*
  929          * XXX: These are errors of varying seriousness being silently
  930          * ignored
  931          */
  932 
  933         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  934                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
  935                         printf("%s timeout for interface %s\n",
  936                                ifctx->dhcpquerytype != DHCP_NOMSG ?
  937                                "DHCP" : "BOOTP",
  938                                ifctx->ireq.ifr_name);
  939                 }
  940         }
  941         if (gctx->gotrootpath != 0) {
  942 #if 0
  943                 printf("Got a root path, ignoring remaining timeout\n");
  944 #endif
  945                 error = 0;
  946                 goto out;
  947         }
  948 #ifndef BOOTP_NFSROOT
  949         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
  950                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
  951                         error = 0;
  952                         goto out;
  953                 }
  954         }
  955 #endif
  956         error = ETIMEDOUT;
  957         goto out;
  958 
  959 gotreply:
  960 out:
  961         soclose(so);
  962 out0:
  963         return error;
  964 }
  965 
  966 static int
  967 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
  968     struct bootpc_globalcontext *gctx, struct thread *td)
  969 {
  970         struct sockaddr_in *sin;
  971         int error;
  972         struct ifreq *ireq;
  973         struct socket *so;
  974         struct ifaddr *ifa;
  975         struct sockaddr_dl *sdl;
  976 
  977         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
  978         if (error != 0)
  979                 panic("nfs_boot: socreate, error=%d", error);
  980 
  981         ireq = &ifctx->ireq;
  982         so = ifctx->so;
  983 
  984         /*
  985          * Bring up the interface.
  986          *
  987          * Get the old interface flags and or IFF_UP into them; if
  988          * IFF_UP set blindly, interface selection can be clobbered.
  989          */
  990         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
  991         if (error != 0)
  992                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
  993         ireq->ifr_flags |= IFF_UP;
  994         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
  995         if (error != 0)
  996                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
  997 
  998         /*
  999          * Do enough of ifconfig(8) so that the chosen interface
 1000          * can talk to the servers.  (just set the address)
 1001          */
 1002 
 1003         /* addr is 0.0.0.0 */
 1004 
 1005         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1006         clear_sinaddr(sin);
 1007         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1008         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1009                 panic("bootpc_fakeup_interface: "
 1010                       "set if addr, error=%d", error);
 1011 
 1012         /* netmask is 255.0.0.0 */
 1013 
 1014         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1015         clear_sinaddr(sin);
 1016         sin->sin_addr.s_addr = htonl(0xff000000u);
 1017         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td);
 1018         if (error != 0)
 1019                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
 1020                       error);
 1021 
 1022         /* Broadcast is 255.255.255.255 */
 1023 
 1024         sin = (struct sockaddr_in *)&ireq->ifr_addr;
 1025         clear_sinaddr(sin);
 1026         clear_sinaddr(&ifctx->broadcast);
 1027         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
 1028         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
 1029 
 1030         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td);
 1031         if (error != 0)
 1032                 panic("bootpc_fakeup_interface: "
 1033                       "set if broadcast addr, error=%d",
 1034                       error);
 1035 
 1036         /* Get HW address */
 1037 
 1038         sdl = NULL;
 1039         TAILQ_FOREACH(ifa, &ifctx->ifp->if_addrhead, ifa_link)
 1040                 if (ifa->ifa_addr->sa_family == AF_LINK) {
 1041                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 1042                         if (sdl->sdl_type == IFT_ETHER)
 1043                                 break;
 1044                 }
 1045 
 1046         if (sdl == NULL)
 1047                 panic("bootpc: Unable to find HW address for %s",
 1048                       ifctx->ireq.ifr_name);
 1049         ifctx->sdl = sdl;
 1050 
 1051         return error;
 1052 }
 1053 
 1054 
 1055 static int
 1056 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 1057     struct bootpc_globalcontext *gctx, struct thread *td)
 1058 {
 1059         int error;
 1060         struct sockaddr_in defdst;
 1061         struct sockaddr_in defmask;
 1062         struct sockaddr_in *sin;
 1063         struct ifreq *ireq;
 1064         struct socket *so;
 1065         struct sockaddr_in *myaddr;
 1066         struct sockaddr_in *netmask;
 1067         struct sockaddr_in *gw;
 1068 
 1069         ireq = &ifctx->ireq;
 1070         so = ifctx->so;
 1071         myaddr = &ifctx->myaddr;
 1072         netmask = &ifctx->netmask;
 1073         gw = &ifctx->gw;
 1074 
 1075         if (bootpc_ifctx_isresolved(ifctx) == 0) {
 1076 
 1077                 /* Shutdown interfaces where BOOTP failed */
 1078 
 1079                 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
 1080                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td);
 1081                 if (error != 0)
 1082                         panic("bootpc_adjust_interface: "
 1083                               "SIOCGIFFLAGS, error=%d", error);
 1084                 ireq->ifr_flags &= ~IFF_UP;
 1085                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td);
 1086                 if (error != 0)
 1087                         panic("bootpc_adjust_interface: "
 1088                               "SIOCSIFFLAGS, error=%d", error);
 1089 
 1090                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1091                 clear_sinaddr(sin);
 1092                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td);
 1093                 if (error != 0 && (error != EEXIST ||
 1094                                    ifctx == gctx->interfaces))
 1095                         panic("bootpc_adjust_interface: "
 1096                               "SIOCDIFADDR, error=%d", error);
 1097 
 1098                 return 0;
 1099         }
 1100 
 1101         printf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
 1102         /*
 1103          * Do enough of ifconfig(8) so that the chosen interface
 1104          * can talk to the servers.  (just set the address)
 1105          */
 1106         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
 1107         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td);
 1108         if (error != 0)
 1109                 panic("bootpc_adjust_interface: "
 1110                       "set if netmask, error=%d", error);
 1111 
 1112         /* Broadcast is with host part of IP address all 1's */
 1113 
 1114         sin = (struct sockaddr_in *) &ireq->ifr_addr;
 1115         clear_sinaddr(sin);
 1116         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
 1117                 ~ netmask->sin_addr.s_addr;
 1118         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td);
 1119         if (error != 0)
 1120                 panic("bootpc_adjust_interface: "
 1121                       "set if broadcast addr, error=%d", error);
 1122 
 1123         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
 1124         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td);
 1125         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
 1126                 panic("bootpc_adjust_interface: "
 1127                       "set if addr, error=%d", error);
 1128 
 1129         /* Add new default route */
 1130 
 1131         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
 1132                 clear_sinaddr(&defdst);
 1133                 clear_sinaddr(&defmask);
 1134                 /* XXX MRT just table 0 */
 1135                 error = rtrequest_fib(RTM_ADD,
 1136                                   (struct sockaddr *) &defdst,
 1137                                   (struct sockaddr *) gw,
 1138                                   (struct sockaddr *) &defmask,
 1139                                   (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, 0);
 1140                 if (error != 0) {
 1141                         printf("bootpc_adjust_interface: "
 1142                                "add net route, error=%d\n", error);
 1143                         return error;
 1144                 }
 1145         }
 1146 
 1147         return 0;
 1148 }
 1149 
 1150 static int
 1151 setfs(struct sockaddr_in *addr, char *path, char *p,
 1152     const struct in_addr *siaddr)
 1153 {
 1154 
 1155         if (getip(&p, &addr->sin_addr) == 0) {
 1156                 if (siaddr != NULL && *p == '/')
 1157                         bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr));
 1158                 else
 1159                         return 0;
 1160         } else {
 1161                 if (*p != ':')
 1162                         return 0;
 1163                 p++;
 1164         }
 1165                 
 1166         addr->sin_len = sizeof(struct sockaddr_in);
 1167         addr->sin_family = AF_INET;
 1168 
 1169         strlcpy(path, p, MNAMELEN);
 1170         return 1;
 1171 }
 1172 
 1173 static int
 1174 getip(char **ptr, struct in_addr *addr)
 1175 {
 1176         char *p;
 1177         unsigned int ip;
 1178         int val;
 1179 
 1180         p = *ptr;
 1181         ip = 0;
 1182         if (((val = getdec(&p)) < 0) || (val > 255))
 1183                 return 0;
 1184         ip = val << 24;
 1185         if (*p != '.')
 1186                 return 0;
 1187         p++;
 1188         if (((val = getdec(&p)) < 0) || (val > 255))
 1189                 return 0;
 1190         ip |= (val << 16);
 1191         if (*p != '.')
 1192                 return 0;
 1193         p++;
 1194         if (((val = getdec(&p)) < 0) || (val > 255))
 1195                 return 0;
 1196         ip |= (val << 8);
 1197         if (*p != '.')
 1198                 return 0;
 1199         p++;
 1200         if (((val = getdec(&p)) < 0) || (val > 255))
 1201                 return 0;
 1202         ip |= val;
 1203 
 1204         addr->s_addr = htonl(ip);
 1205         *ptr = p;
 1206         return 1;
 1207 }
 1208 
 1209 static int
 1210 getdec(char **ptr)
 1211 {
 1212         char *p;
 1213         int ret;
 1214 
 1215         p = *ptr;
 1216         ret = 0;
 1217         if ((*p < '') || (*p > '9'))
 1218                 return -1;
 1219         while ((*p >= '') && (*p <= '9')) {
 1220                 ret = ret * 10 + (*p - '');
 1221                 p++;
 1222         }
 1223         *ptr = p;
 1224         return ret;
 1225 }
 1226 
 1227 static void
 1228 mountopts(struct nfs_args *args, char *p)
 1229 {
 1230         args->version = NFS_ARGSVERSION;
 1231         args->rsize = BOOTP_BLOCKSIZE;
 1232         args->wsize = BOOTP_BLOCKSIZE;
 1233         args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT;
 1234         args->sotype = SOCK_DGRAM;
 1235         if (p != NULL)
 1236                 nfs_parse_options(p, args);
 1237 }
 1238 
 1239 static int
 1240 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len)
 1241 {
 1242         struct mbuf *m;
 1243         int alignedlen;
 1244 
 1245         m = *mptr;
 1246         alignedlen = ( len + 3 ) & ~3;
 1247 
 1248         if (m->m_len < alignedlen) {
 1249                 m = m_pullup(m, alignedlen);
 1250                 if (m == NULL) {
 1251                         *mptr = NULL;
 1252                         return EBADRPC;
 1253                 }
 1254         }
 1255         bcopy(mtod(m, u_char *), buf, len);
 1256         m_adj(m, alignedlen);
 1257         *mptr = m;
 1258         return 0;
 1259 }
 1260 
 1261 static int
 1262 xdr_int_decode(struct mbuf **mptr, int *iptr)
 1263 {
 1264         u_int32_t i;
 1265 
 1266         if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0)
 1267                 return EBADRPC;
 1268         *iptr = fxdr_unsigned(u_int32_t, i);
 1269         return 0;
 1270 }
 1271 
 1272 static void
 1273 print_sin_addr(struct sockaddr_in *sin)
 1274 {
 1275 
 1276         print_in_addr(sin->sin_addr);
 1277 }
 1278 
 1279 static void
 1280 print_in_addr(struct in_addr addr)
 1281 {
 1282         unsigned int ip;
 1283 
 1284         ip = ntohl(addr.s_addr);
 1285         printf("%d.%d.%d.%d",
 1286                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
 1287 }
 1288 
 1289 static void
 1290 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 1291     struct bootpc_globalcontext *gctx, struct thread *td)
 1292 {
 1293         unsigned char *vendp;
 1294         unsigned char vendor_client[64];
 1295         uint32_t leasetime;
 1296         uint8_t vendor_client_len;
 1297 
 1298         ifctx->gotrootpath = 0;
 1299 
 1300         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
 1301 
 1302         /* bootpc part */
 1303         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
 1304         ifctx->call.htype = 1;                  /* 10mb ethernet */
 1305         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
 1306         ifctx->call.hops = 0;
 1307         if (bootpc_ifctx_isunresolved(ifctx) != 0)
 1308                 ifctx->xid++;
 1309         ifctx->call.xid = txdr_unsigned(ifctx->xid);
 1310         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
 1311 
 1312         vendp = ifctx->call.vend;
 1313         *vendp++ = 99;          /* RFC1048 cookie */
 1314         *vendp++ = 130;
 1315         *vendp++ = 83;
 1316         *vendp++ = 99;
 1317         *vendp++ = TAG_MAXMSGSIZE;
 1318         *vendp++ = 2;
 1319         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
 1320         *vendp++ = sizeof(struct bootp_packet) & 255;
 1321 
 1322         snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
 1323                 ostype, MACHINE, osrelease);
 1324         vendor_client_len = strlen(vendor_client);
 1325         *vendp++ = TAG_VENDOR_INDENTIFIER;
 1326         *vendp++ = vendor_client_len;
 1327         memcpy(vendp, vendor_client, vendor_client_len);
 1328         vendp += vendor_client_len;;
 1329         ifctx->dhcpquerytype = DHCP_NOMSG;
 1330         switch (ifctx->state) {
 1331         case IF_DHCP_UNRESOLVED:
 1332                 *vendp++ = TAG_DHCP_MSGTYPE;
 1333                 *vendp++ = 1;
 1334                 *vendp++ = DHCP_DISCOVER;
 1335                 ifctx->dhcpquerytype = DHCP_DISCOVER;
 1336                 ifctx->gotdhcpserver = 0;
 1337                 break;
 1338         case IF_DHCP_OFFERED:
 1339                 *vendp++ = TAG_DHCP_MSGTYPE;
 1340                 *vendp++ = 1;
 1341                 *vendp++ = DHCP_REQUEST;
 1342                 ifctx->dhcpquerytype = DHCP_REQUEST;
 1343                 *vendp++ = TAG_DHCP_REQ_ADDR;
 1344                 *vendp++ = 4;
 1345                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
 1346                 vendp += 4;
 1347                 if (ifctx->gotdhcpserver != 0) {
 1348                         *vendp++ = TAG_DHCP_SERVERID;
 1349                         *vendp++ = 4;
 1350                         memcpy(vendp, &ifctx->dhcpserver, 4);
 1351                         vendp += 4;
 1352                 }
 1353                 *vendp++ = TAG_DHCP_LEASETIME;
 1354                 *vendp++ = 4;
 1355                 leasetime = htonl(300);
 1356                 memcpy(vendp, &leasetime, 4);
 1357                 vendp += 4;
 1358                 break;
 1359         default:
 1360                 break;
 1361         }
 1362         *vendp = TAG_END;
 1363 
 1364         ifctx->call.secs = 0;
 1365         ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */
 1366 }
 1367 
 1368 static int
 1369 bootpc_hascookie(struct bootp_packet *bp)
 1370 {
 1371 
 1372         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
 1373                 bp->vend[2] == 83 && bp->vend[3] == 99);
 1374 }
 1375 
 1376 static void
 1377 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 1378     unsigned char *start, int len, int tag)
 1379 {
 1380         unsigned char *j;
 1381         unsigned char *ej;
 1382         unsigned char code;
 1383 
 1384         if (tctx->badtag != 0 || tctx->badopt != 0)
 1385                 return;
 1386 
 1387         j = start;
 1388         ej = j + len;
 1389 
 1390         while (j < ej) {
 1391                 code = *j++;
 1392                 if (code == TAG_PAD)
 1393                         continue;
 1394                 if (code == TAG_END)
 1395                         return;
 1396                 if (j >= ej || j + *j + 1 > ej) {
 1397                         tctx->badopt = 1;
 1398                         return;
 1399                 }
 1400                 len = *j++;
 1401                 if (code == tag) {
 1402                         if (tctx->taglen + len > TAG_MAXLEN) {
 1403                                 tctx->badtag = 1;
 1404                                 return;
 1405                         }
 1406                         tctx->foundopt = 1;
 1407                         if (len > 0)
 1408                                 memcpy(tctx->buf + tctx->taglen,
 1409                                        j, len);
 1410                         tctx->taglen += len;
 1411                 }
 1412                 if (code == TAG_OVERLOAD)
 1413                         tctx->overload = *j;
 1414 
 1415                 j += len;
 1416         }
 1417 }
 1418 
 1419 static unsigned char *
 1420 bootpc_tag(struct bootpc_tagcontext *tctx,
 1421     struct bootp_packet *bp, int len, int tag)
 1422 {
 1423         tctx->overload = 0;
 1424         tctx->badopt = 0;
 1425         tctx->badtag = 0;
 1426         tctx->foundopt = 0;
 1427         tctx->taglen = 0;
 1428 
 1429         if (bootpc_hascookie(bp) == 0)
 1430                 return NULL;
 1431 
 1432         bootpc_tag_helper(tctx, &bp->vend[4],
 1433                           (unsigned char *) bp + len - &bp->vend[4], tag);
 1434 
 1435         if ((tctx->overload & OVERLOAD_FILE) != 0)
 1436                 bootpc_tag_helper(tctx,
 1437                                   (unsigned char *) bp->file,
 1438                                   sizeof(bp->file),
 1439                                   tag);
 1440         if ((tctx->overload & OVERLOAD_SNAME) != 0)
 1441                 bootpc_tag_helper(tctx,
 1442                                   (unsigned char *) bp->sname,
 1443                                   sizeof(bp->sname),
 1444                                   tag);
 1445 
 1446         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
 1447                 return NULL;
 1448         tctx->buf[tctx->taglen] = '\0';
 1449         return tctx->buf;
 1450 }
 1451 
 1452 static void
 1453 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
 1454     struct bootpc_globalcontext *gctx)
 1455 {
 1456         char *p;
 1457         unsigned int ip;
 1458 
 1459         ifctx->gotgw = 0;
 1460         ifctx->gotnetmask = 0;
 1461 
 1462         clear_sinaddr(&ifctx->myaddr);
 1463         clear_sinaddr(&ifctx->netmask);
 1464         clear_sinaddr(&ifctx->gw);
 1465 
 1466         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
 1467 
 1468         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
 1469 
 1470         printf("%s at ", ifctx->ireq.ifr_name);
 1471         print_sin_addr(&ifctx->myaddr);
 1472         printf(" server ");
 1473         print_in_addr(ifctx->reply.siaddr);
 1474 
 1475         ifctx->gw.sin_addr = ifctx->reply.giaddr;
 1476         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
 1477                 printf(" via gateway ");
 1478                 print_in_addr(ifctx->reply.giaddr);
 1479         }
 1480 
 1481         /* This call used for the side effect (overload flag) */
 1482         (void) bootpc_tag(&gctx->tmptag,
 1483                           &ifctx->reply, ifctx->replylen, TAG_END);
 1484 
 1485         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
 1486                 if (ifctx->reply.sname[0] != '\0')
 1487                         printf(" server name %s", ifctx->reply.sname);
 1488         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
 1489                 if (ifctx->reply.file[0] != '\0')
 1490                         printf(" boot file %s", ifctx->reply.file);
 1491 
 1492         printf("\n");
 1493 
 1494         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1495                        TAG_SUBNETMASK);
 1496         if (p != NULL) {
 1497                 if (gctx->tag.taglen != 4)
 1498                         panic("bootpc: subnet mask len is %d",
 1499                               gctx->tag.taglen);
 1500                 bcopy(p, &ifctx->netmask.sin_addr, 4);
 1501                 ifctx->gotnetmask = 1;
 1502                 printf("subnet mask ");
 1503                 print_sin_addr(&ifctx->netmask);
 1504                 printf(" ");
 1505         }
 1506 
 1507         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1508                        TAG_ROUTERS);
 1509         if (p != NULL) {
 1510                 /* Routers */
 1511                 if (gctx->tag.taglen % 4)
 1512                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
 1513                 if (gctx->tag.taglen > 0) {
 1514                         bcopy(p, &ifctx->gw.sin_addr, 4);
 1515                         printf("router ");
 1516                         print_sin_addr(&ifctx->gw);
 1517                         printf(" ");
 1518                         ifctx->gotgw = 1;
 1519                         gctx->gotgw = 1;
 1520                 }
 1521         }
 1522 
 1523         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1524                        TAG_ROOT);
 1525         if (p != NULL) {
 1526                 if (gctx->setrootfs != NULL) {
 1527                         printf("rootfs %s (ignored) ", p);
 1528                 } else  if (setfs(&nd->root_saddr,
 1529                                   nd->root_hostnam, p, &ifctx->reply.siaddr)) {
 1530                         if (*p == '/') {
 1531                                 printf("root_server ");
 1532                                 print_sin_addr(&nd->root_saddr);
 1533                                 printf(" ");
 1534                         }
 1535                         printf("rootfs %s ", p);
 1536                         gctx->gotrootpath = 1;
 1537                         ifctx->gotrootpath = 1;
 1538                         gctx->setrootfs = ifctx;
 1539 
 1540                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
 1541                                        ifctx->replylen,
 1542                                        TAG_ROOTOPTS);
 1543                         if (p != NULL) {
 1544                                 mountopts(&nd->root_args, p);
 1545                                 printf("rootopts %s ", p);
 1546                         }
 1547                 } else
 1548                         panic("Failed to set rootfs to %s", p);
 1549         }
 1550 
 1551         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1552                        TAG_HOSTNAME);
 1553         if (p != NULL) {
 1554                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
 1555                         panic("bootpc: hostname >= %d bytes",
 1556                               MAXHOSTNAMELEN);
 1557                 if (gctx->sethostname != NULL) {
 1558                         printf("hostname %s (ignored) ", p);
 1559                 } else {
 1560                         strcpy(nd->my_hostnam, p);
 1561                         mtx_lock(&prison0.pr_mtx);
 1562                         strcpy(prison0.pr_hostname, p);
 1563                         mtx_unlock(&prison0.pr_mtx);
 1564                         printf("hostname %s ", p);
 1565                         gctx->sethostname = ifctx;
 1566                 }
 1567         }
 1568         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
 1569                         TAG_COOKIE);
 1570         if (p != NULL) {        /* store in a sysctl variable */
 1571                 int i, l = sizeof(bootp_cookie) - 1;
 1572                 for (i = 0; i < l && p[i] != '\0'; i++)
 1573                         bootp_cookie[i] = p[i];
 1574                 p[i] = '\0';
 1575         }
 1576 
 1577 
 1578         printf("\n");
 1579 
 1580         if (ifctx->gotnetmask == 0) {
 1581                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1582                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
 1583                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
 1584                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
 1585                 else
 1586                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
 1587         }
 1588         if (ifctx->gotgw == 0) {
 1589                 /* Use proxyarp */
 1590                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
 1591         }
 1592 }
 1593 
 1594 void
 1595 bootpc_init(void)
 1596 {
 1597         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
 1598         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
 1599         struct ifnet *ifp;
 1600         int error;
 1601 #ifndef BOOTP_WIRED_TO
 1602         int ifcnt;
 1603 #endif
 1604         struct nfsv3_diskless *nd;
 1605         struct thread *td;
 1606 
 1607         nd = &nfsv3_diskless;
 1608         td = curthread;
 1609 
 1610         /*
 1611          * If already filled in, don't touch it here
 1612          */
 1613         if (nfs_diskless_valid != 0)
 1614                 return;
 1615 
 1616         gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
 1617         if (gctx == NULL)
 1618                 panic("Failed to allocate bootp global context structure");
 1619 
 1620         gctx->xid = ~0xFFFF;
 1621         gctx->starttime = time_second;
 1622 
 1623         /*
 1624          * Find a network interface.
 1625          */
 1626 #ifdef BOOTP_WIRED_TO
 1627         printf("bootpc_init: wired to interface '%s'\n",
 1628                __XSTRING(BOOTP_WIRED_TO));
 1629         allocifctx(gctx);
 1630 #else
 1631         /*
 1632          * Preallocate interface context storage, if another interface
 1633          * attaches and wins the race, it won't be eligible for bootp.
 1634          */
 1635         IFNET_RLOCK();
 1636         for (ifp = TAILQ_FIRST(&V_ifnet), ifcnt = 0;
 1637              ifp != NULL;
 1638              ifp = TAILQ_NEXT(ifp, if_link)) {
 1639                 if ((ifp->if_flags &
 1640                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1641                     IFF_BROADCAST)
 1642                         continue;
 1643                 ifcnt++;
 1644         }
 1645         IFNET_RUNLOCK();
 1646         if (ifcnt == 0)
 1647                 panic("bootpc_init: no eligible interfaces");
 1648         for (; ifcnt > 0; ifcnt--)
 1649                 allocifctx(gctx);
 1650 #endif
 1651 
 1652         IFNET_RLOCK();
 1653         for (ifp = TAILQ_FIRST(&V_ifnet), ifctx = gctx->interfaces;
 1654              ifp != NULL && ifctx != NULL;
 1655              ifp = TAILQ_NEXT(ifp, if_link)) {
 1656                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
 1657                     sizeof(ifctx->ireq.ifr_name));
 1658 #ifdef BOOTP_WIRED_TO
 1659                 if (strcmp(ifctx->ireq.ifr_name,
 1660                            __XSTRING(BOOTP_WIRED_TO)) != 0)
 1661                         continue;
 1662 #else
 1663                 if ((ifp->if_flags &
 1664                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
 1665                     IFF_BROADCAST)
 1666                         continue;
 1667 #endif
 1668                 ifctx->ifp = ifp;
 1669                 ifctx = ifctx->next;
 1670         }
 1671         IFNET_RUNLOCK();
 1672 
 1673         if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) {
 1674 #ifdef BOOTP_WIRED_TO
 1675                 panic("bootpc_init: Could not find interface specified "
 1676                       "by BOOTP_WIRED_TO: "
 1677                       __XSTRING(BOOTP_WIRED_TO));
 1678 #else
 1679                 panic("bootpc_init: no suitable interface");
 1680 #endif
 1681         }
 1682 
 1683         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1684                 bootpc_fakeup_interface(ifctx, gctx, td);
 1685 
 1686         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1687                 bootpc_compose_query(ifctx, gctx, td);
 1688 
 1689         error = bootpc_call(gctx, td);
 1690 
 1691         if (error != 0) {
 1692 #ifdef BOOTP_NFSROOT
 1693                 panic("BOOTP call failed");
 1694 #else
 1695                 printf("BOOTP call failed\n");
 1696 #endif
 1697         }
 1698 
 1699         rootdevnames[0] = "nfs:";
 1700         mountopts(&nd->root_args, NULL);
 1701 
 1702         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1703                 if (bootpc_ifctx_isresolved(ifctx) != 0)
 1704                         bootpc_decode_reply(nd, ifctx, gctx);
 1705 
 1706 #ifdef BOOTP_NFSROOT
 1707         if (gctx->gotrootpath == 0)
 1708                 panic("bootpc: No root path offered");
 1709 #endif
 1710 
 1711         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 1712                 bootpc_adjust_interface(ifctx, gctx, td);
 1713 
 1714                 soclose(ifctx->so);
 1715         }
 1716 
 1717         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
 1718                 if (ifctx->gotrootpath != 0)
 1719                         break;
 1720         if (ifctx == NULL) {
 1721                 for (ifctx = gctx->interfaces;
 1722                      ifctx != NULL;
 1723                      ifctx = ifctx->next)
 1724                         if (bootpc_ifctx_isresolved(ifctx) != 0)
 1725                                 break;
 1726         }
 1727         if (ifctx == NULL)
 1728                 goto out;
 1729 
 1730         if (gctx->gotrootpath != 0) {
 1731 
 1732                 setenv("boot.netif.name", ifctx->ifp->if_xname);
 1733 
 1734                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
 1735                                  nd->root_fh, &nd->root_fhsize,
 1736                                  &nd->root_args, td);
 1737                 if (error != 0)
 1738                         panic("nfs_boot: mountd root, error=%d", error);
 1739 
 1740                 nfs_diskless_valid = 3;
 1741         }
 1742 
 1743         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
 1744         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
 1745         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
 1746         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
 1747                 ifctx->myaddr.sin_addr.s_addr |
 1748                 ~ ifctx->netmask.sin_addr.s_addr;
 1749         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
 1750 
 1751 out:
 1752         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
 1753                 nctx = ifctx->next;
 1754                 free(ifctx, M_TEMP);
 1755         }
 1756         free(gctx, M_TEMP);
 1757 }
 1758 
 1759 /*
 1760  * RPC: mountd/mount
 1761  * Given a server pathname, get an NFS file handle.
 1762  * Also, sets sin->sin_port to the NFS service port.
 1763  */
 1764 static int
 1765 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep,
 1766     struct nfs_args *args, struct thread *td)
 1767 {
 1768         struct mbuf *m;
 1769         int error;
 1770         int authunixok;
 1771         int authcount;
 1772         int authver;
 1773 
 1774 #define RPCPROG_MNT     100005
 1775 #define RPCMNT_VER1     1
 1776 #define RPCMNT_VER3     3
 1777 #define RPCMNT_MOUNT    1
 1778 #define AUTH_SYS        1               /* unix style (uid, gids) */
 1779 #define AUTH_UNIX       AUTH_SYS
 1780 
 1781         /* XXX honor v2/v3 flags in args->flags? */
 1782 #ifdef BOOTP_NFSV3
 1783         /* First try NFS v3 */
 1784         /* Get port number for MOUNTD. */
 1785         error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1786                              &mdsin->sin_port, td);
 1787         if (error == 0) {
 1788                 m = xdr_string_encode(path, strlen(path));
 1789 
 1790                 /* Do RPC to mountd. */
 1791                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3,
 1792                                   RPCMNT_MOUNT, &m, NULL, td);
 1793         }
 1794         if (error == 0) {
 1795                 args->flags |= NFSMNT_NFSV3;
 1796         } else {
 1797 #endif
 1798                 /* Fallback to NFS v2 */
 1799 
 1800                 /* Get port number for MOUNTD. */
 1801                 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1802                                      &mdsin->sin_port, td);
 1803                 if (error != 0)
 1804                         return error;
 1805 
 1806                 m = xdr_string_encode(path, strlen(path));
 1807 
 1808                 /* Do RPC to mountd. */
 1809                 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1,
 1810                                   RPCMNT_MOUNT, &m, NULL, td);
 1811                 if (error != 0)
 1812                         return error;   /* message already freed */
 1813 
 1814 #ifdef BOOTP_NFSV3
 1815         }
 1816 #endif
 1817 
 1818         if (xdr_int_decode(&m, &error) != 0 || error != 0)
 1819                 goto bad;
 1820 
 1821         if ((args->flags & NFSMNT_NFSV3) != 0) {
 1822                 if (xdr_int_decode(&m, fhsizep) != 0 ||
 1823                     *fhsizep > NFSX_V3FHMAX ||
 1824                     *fhsizep <= 0)
 1825                         goto bad;
 1826         } else
 1827                 *fhsizep = NFSX_V2FH;
 1828 
 1829         if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0)
 1830                 goto bad;
 1831 
 1832         if (args->flags & NFSMNT_NFSV3) {
 1833                 if (xdr_int_decode(&m, &authcount) != 0)
 1834                         goto bad;
 1835                 authunixok = 0;
 1836                 if (authcount < 0 || authcount > 100)
 1837                         goto bad;
 1838                 while (authcount > 0) {
 1839                         if (xdr_int_decode(&m, &authver) != 0)
 1840                                 goto bad;
 1841                         if (authver == AUTH_UNIX)
 1842                                 authunixok = 1;
 1843                         authcount--;
 1844                 }
 1845                 if (authunixok == 0)
 1846                         goto bad;
 1847         }
 1848 
 1849         /* Set port number for NFS use. */
 1850         error = krpc_portmap(mdsin, NFS_PROG,
 1851                              (args->flags &
 1852                               NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2,
 1853                              &mdsin->sin_port, td);
 1854 
 1855         goto out;
 1856 
 1857 bad:
 1858         error = EBADRPC;
 1859 
 1860 out:
 1861         m_freem(m);
 1862         return error;
 1863 }
 1864 
 1865 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);

Cache object: 246a3cb106ffbc48e4a4ec301a0503ec


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