1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1989, 1993, 1995\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)showmount.c 8.3 (Berkeley) 3/29/95"; 44 #endif 45 #endif /* not lint */ 46 47 #include <sys/types.h> 48 #include <sys/queue.h> 49 #include <sys/file.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 53 #include <err.h> 54 #include <getopt.h> 55 #include <netdb.h> 56 #include <rpc/rpc.h> 57 #include <rpc/pmap_clnt.h> 58 #include <rpc/pmap_prot.h> 59 #include <rpcsvc/mount.h> 60 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include <vis.h> 66 67 /* Constant defs */ 68 #define ALL 1 69 #define DIRS 2 70 71 #define DODUMP 0x1 72 #define DOEXPORTS 0x2 73 #define DOPARSABLEEXPORTS 0x4 74 75 struct mountlist { 76 struct mountlist *ml_left; 77 struct mountlist *ml_right; 78 char ml_host[MNTNAMLEN+1]; 79 char ml_dirp[MNTPATHLEN+1]; 80 }; 81 82 struct grouplist { 83 struct grouplist *gr_next; 84 char gr_name[MNTNAMLEN+1]; 85 }; 86 87 struct exportslist { 88 struct exportslist *ex_next; 89 struct grouplist *ex_groups; 90 char ex_dirp[MNTPATHLEN+1]; 91 }; 92 93 static struct mountlist *mntdump; 94 static struct exportslist *exportslist; 95 static int type = 0; 96 97 void print_dump(struct mountlist *); 98 static void usage(void) __dead2; 99 int xdr_mntdump(XDR *, struct mountlist **); 100 int xdr_exportslist(XDR *, struct exportslist **); 101 int tcp_callrpc(const char *host, int prognum, int versnum, int procnum, 102 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out); 103 104 static const struct option long_opts[] = { 105 { "all", no_argument, NULL, 'a' }, 106 { "directories", no_argument, NULL, 'd' }, 107 { "exports-script", no_argument, NULL, 'E' }, 108 { "exports", no_argument, NULL, 'e' }, 109 { NULL, 0, NULL, 0 }, 110 }; 111 112 /* 113 * This command queries the NFS mount daemon for it's mount list and/or 114 * it's exports list and prints them out. 115 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A" 116 * and the "Network File System Protocol XXX.." 117 * for detailed information on the protocol. 118 */ 119 int 120 main(int argc, char **argv) 121 { 122 char strvised[MNTPATHLEN * 4 + 1]; 123 register struct exportslist *exp; 124 register struct grouplist *grp; 125 register int rpcs = 0, mntvers = 3; 126 const char *host; 127 int ch, estat, nbytes; 128 129 while ((ch = getopt_long(argc, argv, "+adEe13", long_opts, NULL)) != -1) 130 switch (ch) { 131 case 'a': 132 if (type == 0) { 133 type = ALL; 134 rpcs |= DODUMP; 135 } else 136 usage(); 137 break; 138 case 'd': 139 if (type == 0) { 140 type = DIRS; 141 rpcs |= DODUMP; 142 } else 143 usage(); 144 break; 145 case 'E': 146 rpcs |= DOPARSABLEEXPORTS; 147 break; 148 case 'e': 149 rpcs |= DOEXPORTS; 150 break; 151 case '1': 152 mntvers = 1; 153 break; 154 case '3': 155 mntvers = 3; 156 break; 157 case '?': 158 default: 159 usage(); 160 } 161 argc -= optind; 162 argv += optind; 163 164 if ((rpcs & DOPARSABLEEXPORTS) != 0) { 165 if ((rpcs & DOEXPORTS) != 0) 166 errx(1, "-E cannot be used with -e"); 167 if ((rpcs & DODUMP) != 0) 168 errx(1, "-E cannot be used with -a or -d"); 169 } 170 171 if (argc > 0) 172 host = *argv; 173 else 174 host = "localhost"; 175 176 if (rpcs == 0) 177 rpcs = DODUMP; 178 179 if (rpcs & DODUMP) 180 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers, 181 MOUNTPROC_DUMP, (xdrproc_t)xdr_void, (char *)0, 182 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) { 183 clnt_perrno(estat); 184 errx(1, "can't do mountdump rpc"); 185 } 186 if (rpcs & (DOEXPORTS | DOPARSABLEEXPORTS)) 187 if ((estat = tcp_callrpc(host, MOUNTPROG, mntvers, 188 MOUNTPROC_EXPORT, (xdrproc_t)xdr_void, (char *)0, 189 (xdrproc_t)xdr_exportslist, (char *)&exportslist)) != 0) { 190 clnt_perrno(estat); 191 errx(1, "can't do exports rpc"); 192 } 193 194 /* Now just print out the results */ 195 if (rpcs & DODUMP) { 196 switch (type) { 197 case ALL: 198 printf("All mount points on %s:\n", host); 199 break; 200 case DIRS: 201 printf("Directories on %s:\n", host); 202 break; 203 default: 204 printf("Hosts on %s:\n", host); 205 break; 206 } 207 print_dump(mntdump); 208 } 209 if (rpcs & DOEXPORTS) { 210 printf("Exports list on %s:\n", host); 211 exp = exportslist; 212 while (exp) { 213 printf("%-34s ", exp->ex_dirp); 214 grp = exp->ex_groups; 215 if (grp == NULL) { 216 printf("Everyone\n"); 217 } else { 218 while (grp) { 219 printf("%s ", grp->gr_name); 220 grp = grp->gr_next; 221 } 222 printf("\n"); 223 } 224 exp = exp->ex_next; 225 } 226 } 227 if (rpcs & DOPARSABLEEXPORTS) { 228 exp = exportslist; 229 while (exp) { 230 nbytes = strsnvis(strvised, sizeof(strvised), 231 exp->ex_dirp, VIS_GLOB | VIS_NL, "\"'$"); 232 if (nbytes == -1) 233 err(1, "strsnvis"); 234 printf("%s\n", strvised); 235 exp = exp->ex_next; 236 } 237 } 238 exit(0); 239 } 240 241 /* 242 * tcp_callrpc has the same interface as callrpc, but tries to 243 * use tcp as transport method in order to handle large replies. 244 */ 245 int 246 tcp_callrpc(const char *host, int prognum, int versnum, int procnum, 247 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out) 248 { 249 CLIENT *client; 250 struct timeval timeout; 251 int rval; 252 253 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL && 254 (client = clnt_create(host, prognum, versnum, "udp")) == NULL) 255 return ((int) rpc_createerr.cf_stat); 256 257 timeout.tv_sec = 25; 258 timeout.tv_usec = 0; 259 rval = (int) clnt_call(client, procnum, 260 inproc, in, 261 outproc, out, 262 timeout); 263 clnt_destroy(client); 264 return rval; 265 } 266 267 /* 268 * Xdr routine for retrieving the mount dump list 269 */ 270 int 271 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp) 272 { 273 register struct mountlist *mp; 274 register struct mountlist *tp; 275 register struct mountlist **otp; 276 int val, val2; 277 int bool; 278 char *strp; 279 280 *mlp = (struct mountlist *)0; 281 if (!xdr_bool(xdrsp, &bool)) 282 return (0); 283 while (bool) { 284 mp = (struct mountlist *)malloc(sizeof(struct mountlist)); 285 if (mp == NULL) 286 return (0); 287 mp->ml_left = mp->ml_right = (struct mountlist *)0; 288 strp = mp->ml_host; 289 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) { 290 free(mp); 291 return (0); 292 } 293 strp = mp->ml_dirp; 294 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) { 295 free(mp); 296 return (0); 297 } 298 299 /* 300 * Build a binary tree on sorted order of either host or dirp. 301 * Drop any duplications. 302 */ 303 if (*mlp == NULL) { 304 *mlp = mp; 305 } else { 306 tp = *mlp; 307 while (tp) { 308 val = strcmp(mp->ml_host, tp->ml_host); 309 val2 = strcmp(mp->ml_dirp, tp->ml_dirp); 310 switch (type) { 311 case ALL: 312 if (val == 0) { 313 if (val2 == 0) { 314 free((caddr_t)mp); 315 goto next; 316 } 317 val = val2; 318 } 319 break; 320 case DIRS: 321 if (val2 == 0) { 322 free((caddr_t)mp); 323 goto next; 324 } 325 val = val2; 326 break; 327 default: 328 if (val == 0) { 329 free((caddr_t)mp); 330 goto next; 331 } 332 break; 333 } 334 if (val < 0) { 335 otp = &tp->ml_left; 336 tp = tp->ml_left; 337 } else { 338 otp = &tp->ml_right; 339 tp = tp->ml_right; 340 } 341 } 342 *otp = mp; 343 } 344 next: 345 if (!xdr_bool(xdrsp, &bool)) 346 return (0); 347 } 348 return (1); 349 } 350 351 /* 352 * Xdr routine to retrieve exports list 353 */ 354 int 355 xdr_exportslist(XDR *xdrsp, struct exportslist **exp) 356 { 357 register struct exportslist *ep; 358 register struct grouplist *gp; 359 int bool, grpbool; 360 char *strp; 361 362 *exp = (struct exportslist *)0; 363 if (!xdr_bool(xdrsp, &bool)) 364 return (0); 365 while (bool) { 366 ep = (struct exportslist *)malloc(sizeof(struct exportslist)); 367 if (ep == NULL) 368 return (0); 369 ep->ex_groups = (struct grouplist *)0; 370 strp = ep->ex_dirp; 371 if (!xdr_string(xdrsp, &strp, MNTPATHLEN)) 372 return (0); 373 if (!xdr_bool(xdrsp, &grpbool)) 374 return (0); 375 while (grpbool) { 376 gp = (struct grouplist *)malloc(sizeof(struct grouplist)); 377 if (gp == NULL) 378 return (0); 379 strp = gp->gr_name; 380 if (!xdr_string(xdrsp, &strp, MNTNAMLEN)) 381 return (0); 382 gp->gr_next = ep->ex_groups; 383 ep->ex_groups = gp; 384 if (!xdr_bool(xdrsp, &grpbool)) 385 return (0); 386 } 387 ep->ex_next = *exp; 388 *exp = ep; 389 if (!xdr_bool(xdrsp, &bool)) 390 return (0); 391 } 392 return (1); 393 } 394 395 static void 396 usage(void) 397 { 398 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n"); 399 exit(1); 400 } 401 402 /* 403 * Print the binary tree in inorder so that output is sorted. 404 */ 405 void 406 print_dump(struct mountlist *mp) 407 { 408 409 if (mp == NULL) 410 return; 411 if (mp->ml_left) 412 print_dump(mp->ml_left); 413 switch (type) { 414 case ALL: 415 printf("%s:%s\n", mp->ml_host, mp->ml_dirp); 416 break; 417 case DIRS: 418 printf("%s\n", mp->ml_dirp); 419 break; 420 default: 421 printf("%s\n", mp->ml_host); 422 break; 423 } 424 if (mp->ml_right) 425 print_dump(mp->ml_right); 426 } 427