1 /* $NetBSD: bootparam.c,v 1.11 1997/06/26 19:11:32 drochner Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Gordon W. Ross 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 4. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Gordon W. Ross 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 * $DragonFly: src/lib/libstand/bootparam.c,v 1.2 2005/12/11 02:27:26 swildner Exp $ 33 */ 34 35 /* 36 * RPC/bootparams 37 */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 44 #include <netinet/in.h> 45 #include <netinet/in_systm.h> 46 47 #include <string.h> 48 49 #include "rpcv2.h" 50 51 #include "stand.h" 52 #include "net.h" 53 #include "netif.h" 54 #include "rpc.h" 55 #include "bootparam.h" 56 57 #ifdef DEBUG_RPC 58 #define RPC_PRINTF(a) printf a 59 #else 60 #define RPC_PRINTF(a) 61 #endif 62 63 struct in_addr bp_server_addr; /* net order */ 64 n_short bp_server_port; /* net order */ 65 66 /* 67 * RPC definitions for bootparamd 68 */ 69 #define BOOTPARAM_PROG 100026 70 #define BOOTPARAM_VERS 1 71 #define BOOTPARAM_WHOAMI 1 72 #define BOOTPARAM_GETFILE 2 73 74 /* 75 * Inet address in RPC messages 76 * (Note, really four ints, NOT chars. Blech.) 77 */ 78 struct xdr_inaddr { 79 u_int32_t atype; 80 int32_t addr[4]; 81 }; 82 83 int xdr_inaddr_encode(char **p, struct in_addr ia); 84 int xdr_inaddr_decode(char **p, struct in_addr *ia); 85 86 int xdr_string_encode(char **p, char *str, int len); 87 int xdr_string_decode(char **p, char *str, int *len_p); 88 89 90 /* 91 * RPC: bootparam/whoami 92 * Given client IP address, get: 93 * client name (hostname) 94 * domain name (domainname) 95 * gateway address 96 * 97 * The hostname and domainname are set here for convenience. 98 * 99 * Note - bpsin is initialized to the broadcast address, 100 * and will be replaced with the bootparam server address 101 * after this call is complete. Have to use PMAP_PROC_CALL 102 * to make sure we get responses only from a servers that 103 * know about us (don't want to broadcast a getport call). 104 */ 105 int 106 bp_whoami(int sockfd) 107 { 108 /* RPC structures for PMAPPROC_CALLIT */ 109 struct args { 110 u_int32_t prog; 111 u_int32_t vers; 112 u_int32_t proc; 113 u_int32_t arglen; 114 struct xdr_inaddr xina; 115 } *args; 116 struct repl { 117 u_int16_t _pad; 118 u_int16_t port; 119 u_int32_t encap_len; 120 /* encapsulated data here */ 121 n_long capsule[64]; 122 } *repl; 123 struct { 124 n_long h[RPC_HEADER_WORDS]; 125 struct args d; 126 } sdata; 127 struct { 128 n_long h[RPC_HEADER_WORDS]; 129 struct repl d; 130 } rdata; 131 char *send_tail, *recv_head; 132 struct iodesc *d; 133 int len, x; 134 135 RPC_PRINTF(("bp_whoami: myip=%s\n", inet_ntoa(myip))); 136 137 if (!(d = socktodesc(sockfd))) { 138 RPC_PRINTF(("bp_whoami: bad socket. %d\n", sockfd)); 139 return (-1); 140 } 141 args = &sdata.d; 142 repl = &rdata.d; 143 144 /* 145 * Build request args for PMAPPROC_CALLIT. 146 */ 147 args->prog = htonl(BOOTPARAM_PROG); 148 args->vers = htonl(BOOTPARAM_VERS); 149 args->proc = htonl(BOOTPARAM_WHOAMI); 150 args->arglen = htonl(sizeof(struct xdr_inaddr)); 151 send_tail = (char*) &args->xina; 152 153 /* 154 * append encapsulated data (client IP address) 155 */ 156 if (xdr_inaddr_encode(&send_tail, myip)) 157 return (-1); 158 159 /* RPC: portmap/callit */ 160 d->myport = htons(rpc_newport()); 161 d->destip.s_addr = INADDR_BROADCAST; /* XXX: subnet bcast? */ 162 /* rpc_call will set d->destport */ 163 164 len = rpc_call(d, PMAPPROG, PMAPVERS, PMAPPROC_CALLIT, 165 args, send_tail - (char*)args, 166 repl, sizeof(*repl)); 167 if (len < 8) { 168 printf("bootparamd: 'whoami' call failed\n"); 169 return (-1); 170 } 171 172 /* Save bootparam server address (from IP header). */ 173 rpc_fromaddr(repl, &bp_server_addr, &bp_server_port); 174 175 /* 176 * Note that bp_server_port is now 111 due to the 177 * indirect call (using PMAPPROC_CALLIT), so get the 178 * actual port number from the reply data. 179 */ 180 bp_server_port = repl->port; 181 182 RPC_PRINTF(("bp_whoami: server at %s:%d\n", 183 inet_ntoa(bp_server_addr), ntohs(bp_server_port))); 184 185 /* We have just done a portmap call, so cache the portnum. */ 186 rpc_pmap_putcache(bp_server_addr, 187 BOOTPARAM_PROG, 188 BOOTPARAM_VERS, 189 (int)ntohs(bp_server_port)); 190 191 /* 192 * Parse the encapsulated results from bootparam/whoami 193 */ 194 x = ntohl(repl->encap_len); 195 if (len < x) { 196 printf("bp_whoami: short reply, %d < %d\n", len, x); 197 return (-1); 198 } 199 recv_head = (char*) repl->capsule; 200 201 /* client name */ 202 hostnamelen = MAXHOSTNAMELEN-1; 203 if (xdr_string_decode(&recv_head, hostname, &hostnamelen)) { 204 RPC_PRINTF(("bp_whoami: bad hostname\n")); 205 return (-1); 206 } 207 208 /* domain name */ 209 domainnamelen = MAXHOSTNAMELEN-1; 210 if (xdr_string_decode(&recv_head, domainname, &domainnamelen)) { 211 RPC_PRINTF(("bp_whoami: bad domainname\n")); 212 return (-1); 213 } 214 215 /* gateway address */ 216 if (xdr_inaddr_decode(&recv_head, &gateip)) { 217 RPC_PRINTF(("bp_whoami: bad gateway\n")); 218 return (-1); 219 } 220 221 /* success */ 222 return(0); 223 } 224 225 226 /* 227 * RPC: bootparam/getfile 228 * Given client name and file "key", get: 229 * server name 230 * server IP address 231 * server pathname 232 */ 233 int 234 bp_getfile(int sockfd, char *key, struct in_addr *serv_addr, char *pathname) 235 { 236 struct { 237 n_long h[RPC_HEADER_WORDS]; 238 n_long d[64]; 239 } sdata; 240 struct { 241 n_long h[RPC_HEADER_WORDS]; 242 n_long d[128]; 243 } rdata; 244 char serv_name[FNAME_SIZE]; 245 char *send_tail, *recv_head; 246 /* misc... */ 247 struct iodesc *d; 248 int sn_len, path_len, rlen; 249 250 if (!(d = socktodesc(sockfd))) { 251 RPC_PRINTF(("bp_getfile: bad socket. %d\n", sockfd)); 252 return (-1); 253 } 254 255 send_tail = (char*) sdata.d; 256 recv_head = (char*) rdata.d; 257 258 /* 259 * Build request message. 260 */ 261 262 /* client name (hostname) */ 263 if (xdr_string_encode(&send_tail, hostname, hostnamelen)) { 264 RPC_PRINTF(("bp_getfile: bad client\n")); 265 return (-1); 266 } 267 268 /* key name (root or swap) */ 269 if (xdr_string_encode(&send_tail, key, strlen(key))) { 270 RPC_PRINTF(("bp_getfile: bad key\n")); 271 return (-1); 272 } 273 274 /* RPC: bootparam/getfile */ 275 d->myport = htons(rpc_newport()); 276 d->destip = bp_server_addr; 277 /* rpc_call will set d->destport */ 278 279 rlen = rpc_call(d, 280 BOOTPARAM_PROG, BOOTPARAM_VERS, BOOTPARAM_GETFILE, 281 sdata.d, send_tail - (char*)sdata.d, 282 rdata.d, sizeof(rdata.d)); 283 if (rlen < 4) { 284 RPC_PRINTF(("bp_getfile: short reply\n")); 285 errno = EBADRPC; 286 return (-1); 287 } 288 recv_head = (char*) rdata.d; 289 290 /* 291 * Parse result message. 292 */ 293 294 /* server name */ 295 sn_len = FNAME_SIZE-1; 296 if (xdr_string_decode(&recv_head, serv_name, &sn_len)) { 297 RPC_PRINTF(("bp_getfile: bad server name\n")); 298 return (-1); 299 } 300 301 /* server IP address (mountd/NFS) */ 302 if (xdr_inaddr_decode(&recv_head, serv_addr)) { 303 RPC_PRINTF(("bp_getfile: bad server addr\n")); 304 return (-1); 305 } 306 307 /* server pathname */ 308 path_len = MAXPATHLEN-1; 309 if (xdr_string_decode(&recv_head, pathname, &path_len)) { 310 RPC_PRINTF(("bp_getfile: bad server path\n")); 311 return (-1); 312 } 313 314 /* success */ 315 return(0); 316 } 317 318 319 /* 320 * eXternal Data Representation routines. 321 * (but with non-standard args...) 322 */ 323 324 325 int 326 xdr_string_encode(char **pkt, char *str, int len) 327 { 328 u_int32_t *lenp; 329 char *datap; 330 int padlen = (len + 3) & ~3; /* padded length */ 331 332 /* The data will be int aligned. */ 333 lenp = (u_int32_t*) *pkt; 334 *pkt += sizeof(*lenp); 335 *lenp = htonl(len); 336 337 datap = *pkt; 338 *pkt += padlen; 339 bcopy(str, datap, len); 340 341 return (0); 342 } 343 344 /* 345 * Parameters: 346 * len_p: bufsize - 1 347 */ 348 int 349 xdr_string_decode(char **pkt, char *str, int *len_p) 350 { 351 u_int32_t *lenp; 352 char *datap; 353 int slen; /* string length */ 354 int plen; /* padded length */ 355 356 /* The data will be int aligned. */ 357 lenp = (u_int32_t*) *pkt; 358 *pkt += sizeof(*lenp); 359 slen = ntohl(*lenp); 360 plen = (slen + 3) & ~3; 361 362 if (slen > *len_p) 363 slen = *len_p; 364 datap = *pkt; 365 *pkt += plen; 366 bcopy(datap, str, slen); 367 368 str[slen] = '\0'; 369 *len_p = slen; 370 371 return (0); 372 } 373 374 /* 375 * Parameters: 376 * ia: network order 377 */ 378 int 379 xdr_inaddr_encode(char **pkt, struct in_addr ia) 380 { 381 struct xdr_inaddr *xi; 382 u_char *cp; 383 int32_t *ip; 384 union { 385 n_long l; /* network order */ 386 u_char c[4]; 387 } uia; 388 389 /* The data will be int aligned. */ 390 xi = (struct xdr_inaddr *) *pkt; 391 *pkt += sizeof(*xi); 392 xi->atype = htonl(1); 393 uia.l = ia.s_addr; 394 cp = uia.c; 395 ip = xi->addr; 396 /* 397 * Note: the htonl() calls below DO NOT 398 * imply that uia.l is in host order. 399 * In fact this needs it in net order. 400 */ 401 *ip++ = htonl((unsigned int)*cp++); 402 *ip++ = htonl((unsigned int)*cp++); 403 *ip++ = htonl((unsigned int)*cp++); 404 *ip++ = htonl((unsigned int)*cp++); 405 406 return (0); 407 } 408 409 /* 410 * Parameters: 411 * ia: network order 412 */ 413 int 414 xdr_inaddr_decode(char **pkt, struct in_addr *ia) 415 { 416 struct xdr_inaddr *xi; 417 u_char *cp; 418 int32_t *ip; 419 union { 420 n_long l; /* network order */ 421 u_char c[4]; 422 } uia; 423 424 /* The data will be int aligned. */ 425 xi = (struct xdr_inaddr *) *pkt; 426 *pkt += sizeof(*xi); 427 if (xi->atype != htonl(1)) { 428 RPC_PRINTF(("xdr_inaddr_decode: bad addrtype=%d\n", 429 ntohl(xi->atype))); 430 return(-1); 431 } 432 433 cp = uia.c; 434 ip = xi->addr; 435 /* 436 * Note: the ntohl() calls below DO NOT 437 * imply that uia.l is in host order. 438 * In fact this needs it in net order. 439 */ 440 *cp++ = ntohl(*ip++); 441 *cp++ = ntohl(*ip++); 442 *cp++ = ntohl(*ip++); 443 *cp++ = ntohl(*ip++); 444 ia->s_addr = uia.l; 445 446 return (0); 447 } 448