1 /* 2 * Copyright (c) 1989, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1989, 1993, 1995 The Regents of the University of California. All rights reserved. 37 * @(#)showmount.c 8.3 (Berkeley) 3/29/95 38 * $FreeBSD: src/usr.bin/showmount/showmount.c,v 1.16 2005/05/21 09:55:08 ru Exp $ 39 * $DragonFly: src/usr.bin/showmount/showmount.c,v 1.5 2005/09/05 04:22:07 swildner Exp $ 40 */ 41 42 #include <sys/types.h> 43 #include <sys/queue.h> 44 #include <sys/file.h> 45 #include <sys/socket.h> 46 #include <sys/socketvar.h> 47 48 #include <err.h> 49 #include <netdb.h> 50 #include <rpc/rpc.h> 51 #include <rpc/pmap_clnt.h> 52 #include <rpc/pmap_prot.h> 53 #include <nfs/rpcv2.h> 54 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 /* Constant defs */ 61 #define ALL 1 62 #define DIRS 2 63 64 #define DODUMP 0x1 65 #define DOEXPORTS 0x2 66 67 struct mountlist { 68 struct mountlist *ml_left; 69 struct mountlist *ml_right; 70 char ml_host[RPCMNT_NAMELEN+1]; 71 char ml_dirp[RPCMNT_PATHLEN+1]; 72 }; 73 74 struct grouplist { 75 struct grouplist *gr_next; 76 char gr_name[RPCMNT_NAMELEN+1]; 77 }; 78 79 struct exportslist { 80 struct exportslist *ex_next; 81 struct grouplist *ex_groups; 82 char ex_dirp[RPCMNT_PATHLEN+1]; 83 }; 84 85 static struct mountlist *mntdump; 86 static struct exportslist *exports; 87 static int type = 0; 88 89 void print_dump(struct mountlist *); 90 static void usage(void); 91 int xdr_mntdump(XDR *, struct mountlist **); 92 int xdr_exports(XDR *, struct exportslist **); 93 int tcp_callrpc(const char *, int, int, int, xdrproc_t, char *, xdrproc_t, 94 char *); 95 96 /* 97 * This command queries the NFS mount daemon for it's mount list and/or 98 * it's exports list and prints them out. 99 * See "NFS: Network File System Protocol Specification, RFC1094, Appendix A" 100 * and the "Network File System Protocol XXX.." 101 * for detailed information on the protocol. 102 */ 103 int 104 main(int argc, char **argv) 105 { 106 struct exportslist *exp; 107 struct grouplist *grp; 108 int rpcs = 0, mntvers = 1; 109 const char *host; 110 int ch, estat; 111 112 while ((ch = getopt(argc, argv, "ade3")) != -1) 113 switch (ch) { 114 case 'a': 115 if (type == 0) { 116 type = ALL; 117 rpcs |= DODUMP; 118 } else 119 usage(); 120 break; 121 case 'd': 122 if (type == 0) { 123 type = DIRS; 124 rpcs |= DODUMP; 125 } else 126 usage(); 127 break; 128 case 'e': 129 rpcs |= DOEXPORTS; 130 break; 131 case '3': 132 mntvers = 3; 133 break; 134 case '?': 135 default: 136 usage(); 137 } 138 argc -= optind; 139 argv += optind; 140 141 if (argc > 0) 142 host = *argv; 143 else 144 host = "localhost"; 145 146 if (rpcs == 0) 147 rpcs = DODUMP; 148 149 if (rpcs & DODUMP) 150 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers, 151 RPCMNT_DUMP, (xdrproc_t)xdr_void, NULL, 152 (xdrproc_t)xdr_mntdump, (char *)&mntdump)) != 0) { 153 clnt_perrno(estat); 154 errx(1, "can't do mountdump rpc"); 155 } 156 if (rpcs & DOEXPORTS) 157 if ((estat = tcp_callrpc(host, RPCPROG_MNT, mntvers, 158 RPCMNT_EXPORT, (xdrproc_t)xdr_void, NULL, 159 (xdrproc_t)xdr_exports, (char *)&exports)) != 0) { 160 clnt_perrno(estat); 161 errx(1, "can't do exports rpc"); 162 } 163 164 /* Now just print out the results */ 165 if (rpcs & DODUMP) { 166 switch (type) { 167 case ALL: 168 printf("All mount points on %s:\n", host); 169 break; 170 case DIRS: 171 printf("Directories on %s:\n", host); 172 break; 173 default: 174 printf("Hosts on %s:\n", host); 175 break; 176 }; 177 print_dump(mntdump); 178 } 179 if (rpcs & DOEXPORTS) { 180 printf("Exports list on %s:\n", host); 181 exp = exports; 182 while (exp) { 183 printf("%-35s", exp->ex_dirp); 184 grp = exp->ex_groups; 185 if (grp == NULL) { 186 printf("Everyone\n"); 187 } else { 188 while (grp) { 189 printf("%s ", grp->gr_name); 190 grp = grp->gr_next; 191 } 192 printf("\n"); 193 } 194 exp = exp->ex_next; 195 } 196 } 197 exit(0); 198 } 199 200 /* 201 * tcp_callrpc has the same interface as callrpc, but tries to 202 * use tcp as transport method in order to handle large replies. 203 */ 204 int 205 tcp_callrpc(const char *host, int prognum, int versnum, int procnum, 206 xdrproc_t inproc, char *in, xdrproc_t outproc, char *out) 207 { 208 CLIENT *client; 209 struct timeval timeout; 210 int rval; 211 212 if ((client = clnt_create(host, prognum, versnum, "tcp")) == NULL && 213 (client = clnt_create(host, prognum, versnum, "udp")) == NULL) 214 return ((int) rpc_createerr.cf_stat); 215 216 timeout.tv_sec = 25; 217 timeout.tv_usec = 0; 218 rval = (int) clnt_call(client, procnum, 219 inproc, in, 220 outproc, out, 221 timeout); 222 clnt_destroy(client); 223 return rval; 224 } 225 226 /* 227 * Xdr routine for retrieving the mount dump list 228 */ 229 int 230 xdr_mntdump(XDR *xdrsp, struct mountlist **mlp) 231 { 232 struct mountlist *mp; 233 struct mountlist *tp; 234 struct mountlist **otp = NULL; 235 int val, val2; 236 int bool; 237 char *strp; 238 239 *mlp = NULL; 240 if (!xdr_bool(xdrsp, &bool)) 241 return (0); 242 while (bool) { 243 mp = (struct mountlist *)malloc(sizeof(struct mountlist)); 244 if (mp == NULL) 245 return (0); 246 mp->ml_left = mp->ml_right = NULL; 247 strp = mp->ml_host; 248 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 249 return (0); 250 strp = mp->ml_dirp; 251 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 252 return (0); 253 254 /* 255 * Build a binary tree on sorted order of either host or dirp. 256 * Drop any duplications. 257 */ 258 if (*mlp == NULL) { 259 *mlp = mp; 260 } else { 261 tp = *mlp; 262 while (tp) { 263 val = strcmp(mp->ml_host, tp->ml_host); 264 val2 = strcmp(mp->ml_dirp, tp->ml_dirp); 265 switch (type) { 266 case ALL: 267 if (val == 0) { 268 if (val2 == 0) { 269 free(mp); 270 goto next; 271 } 272 val = val2; 273 } 274 break; 275 case DIRS: 276 if (val2 == 0) { 277 free(mp); 278 goto next; 279 } 280 val = val2; 281 break; 282 default: 283 if (val == 0) { 284 free(mp); 285 goto next; 286 } 287 break; 288 }; 289 if (val < 0) { 290 otp = &tp->ml_left; 291 tp = tp->ml_left; 292 } else { 293 otp = &tp->ml_right; 294 tp = tp->ml_right; 295 } 296 } 297 *otp = mp; 298 } 299 next: 300 if (!xdr_bool(xdrsp, &bool)) 301 return (0); 302 } 303 return (1); 304 } 305 306 /* 307 * Xdr routine to retrieve exports list 308 */ 309 int 310 xdr_exports(XDR *xdrsp, struct exportslist **exp) 311 { 312 struct exportslist *ep; 313 struct grouplist *gp; 314 int bool, grpbool; 315 char *strp; 316 317 *exp = NULL; 318 if (!xdr_bool(xdrsp, &bool)) 319 return (0); 320 while (bool) { 321 ep = (struct exportslist *)malloc(sizeof(struct exportslist)); 322 if (ep == NULL) 323 return (0); 324 ep->ex_groups = NULL; 325 strp = ep->ex_dirp; 326 if (!xdr_string(xdrsp, &strp, RPCMNT_PATHLEN)) 327 return (0); 328 if (!xdr_bool(xdrsp, &grpbool)) 329 return (0); 330 while (grpbool) { 331 gp = (struct grouplist *)malloc(sizeof(struct grouplist)); 332 if (gp == NULL) 333 return (0); 334 strp = gp->gr_name; 335 if (!xdr_string(xdrsp, &strp, RPCMNT_NAMELEN)) 336 return (0); 337 gp->gr_next = ep->ex_groups; 338 ep->ex_groups = gp; 339 if (!xdr_bool(xdrsp, &grpbool)) 340 return (0); 341 } 342 ep->ex_next = *exp; 343 *exp = ep; 344 if (!xdr_bool(xdrsp, &bool)) 345 return (0); 346 } 347 return (1); 348 } 349 350 static void 351 usage(void) 352 { 353 fprintf(stderr, "usage: showmount [-a | -d] [-e3] [host]\n"); 354 exit(1); 355 } 356 357 /* 358 * Print the binary tree in inorder so that output is sorted. 359 */ 360 void 361 print_dump(struct mountlist *mp) 362 { 363 364 if (mp == NULL) 365 return; 366 if (mp->ml_left) 367 print_dump(mp->ml_left); 368 switch (type) { 369 case ALL: 370 printf("%s:%s\n", mp->ml_host, mp->ml_dirp); 371 break; 372 case DIRS: 373 printf("%s\n", mp->ml_dirp); 374 break; 375 default: 376 printf("%s\n", mp->ml_host); 377 break; 378 }; 379 if (mp->ml_right) 380 print_dump(mp->ml_right); 381 } 382