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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
     23 /*	  All Rights Reserved  	*/
     24 
     25 
     26 /*
     27  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
     28  * Use is subject to license terms.
     29  */
     30 
     31 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     32 
     33 /*
     34  *	generic interface to dfs commands.
     35  *
     36  *	usage:	cmd [-F fstype] [-o fs_options] [ args ]
     37  *
     38  *	exec's /usr/lib/fs/<fstype>/<cmd>
     39  *	<cmd> is the basename of the command.
     40  *
     41  *	if -F is missing, fstype is the first entry in /etc/dfs/fstypes
     42  */
     43 
     44 #include <sys/types.h>
     45 #include <sys/stat.h>
     46 #include <ctype.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <unistd.h>
     50 #include <dirent.h>
     51 #include <string.h>
     52 
     53 #define	DFSTYPES	"/etc/dfs/fstypes"		/* dfs list */
     54 #define	FSCMD		"/usr/lib/fs/%s/%s"
     55 
     56 #define	ARGVPAD		4	/* non-[arg...] elements in new argv list: */
     57 				/* cmd name, -o, opts, (char *)0 terminator */
     58 
     59 static char *getfs();
     60 void perror();
     61 
     62 int
     63 main(argc, argv)
     64 int argc;
     65 char **argv;
     66 {
     67 	static int invalid();
     68 	extern char *optarg;
     69 	extern int optind;
     70 	FILE *dfp;		/* fp for dfs list */
     71 	int c, err = 0;
     72 	char subcmd[BUFSIZ];	/* fs specific command */
     73 	char *cmd;		/* basename of this command */
     74 	char *fsname = NULL;	/* file system name */
     75 	char *opts = NULL;	/* -o options */
     76 	char **nargv;		/* new argv list */
     77 	int nargc = 0;		/* new argc */
     78 	static char usage[] =
     79 		"usage: %s [-F fstype] [-o fs_options ] [arg ...]\n";
     80 
     81 	cmd = strrchr(argv[0], '/');	/* find the basename */
     82 	if (cmd)
     83 		++cmd;
     84 	else
     85 		cmd = argv[0];
     86 
     87 	while ((c = getopt(argc, argv, "F:o:")) != -1)
     88 		switch (c) {
     89 		case 'F':
     90 			err |= (fsname != NULL);	/* at most one -F */
     91 			fsname = optarg;
     92 			break;
     93 		case 'o':			/* fs specific options */
     94 			err |= (opts != NULL);		/* at most one -o */
     95 			opts = optarg;
     96 			break;
     97 		case '?':
     98 			err = 1;
     99 			break;
    100 		}
    101 	if (err) {
    102 		(void) fprintf(stderr, usage, cmd);
    103 		exit(1);
    104 	}
    105 
    106 	if ((dfp = fopen(DFSTYPES, "r")) == NULL) {
    107 		(void) fprintf(stderr, "%s: cannot open %s\n",
    108 			cmd, DFSTYPES);
    109 		exit(1);
    110 	}
    111 
    112 	if (fsname) {		/* generate fs specific command name */
    113 		if (invalid(fsname, dfp)) {	/* valid ? */
    114 			(void) fprintf(stderr,
    115 			    "%s: invalid file system name\n", cmd);
    116 			(void) fprintf(stderr, usage, cmd);
    117 			exit(1);
    118 		} else {
    119 			(void) snprintf(subcmd, sizeof (subcmd),
    120 			    FSCMD, fsname, cmd);
    121 		}
    122 	} else if (fsname = getfs(dfp)) {	/* use 1st line in dfstypes */
    123 		(void) snprintf(subcmd, sizeof (subcmd), FSCMD, fsname, cmd);
    124 	} else {
    125 		(void) fprintf(stderr,
    126 		    "%s: no file systems in %s\n", cmd, DFSTYPES);
    127 		(void) fprintf(stderr, usage, cmd);
    128 		exit(1);
    129 	}
    130 
    131 	/* allocate a block for the new argv list */
    132 	if (!(nargv = (char **)malloc(sizeof (char *)*(argc-optind+ARGVPAD)))) {
    133 		(void) fprintf(stderr, "%s: malloc failed.\n", cmd);
    134 		exit(1);
    135 		/*NOTREACHED*/
    136 	}
    137 	nargv[nargc++] = cmd;
    138 	if (opts) {
    139 		nargv[nargc++] = "-o";
    140 		nargv[nargc++] = opts;
    141 	}
    142 	for (; optind <= argc; ++optind)	/* this copies the last NULL */
    143 		nargv[nargc++] = argv[optind];
    144 
    145 	(void) execvp(subcmd, nargv);
    146 	perror(subcmd);
    147 	return (1);
    148 }
    149 
    150 
    151 /*
    152  *	invalid(name, f)  -  return non-zero if name is not in
    153  *			     the list of fs names in file f
    154  */
    155 
    156 static int
    157 invalid(name, f)
    158 char *name;		/* file system name */
    159 FILE *f;		/* file of list of systems */
    160 {
    161 	char *s;
    162 
    163 	while (s = getfs(f))	/* while there's still hope ... */
    164 		if (strcmp(s, name) == 0)
    165 			return (0);	/* we got it! */
    166 	return (1);
    167 }
    168 
    169 
    170 /*
    171  *	getfs(fp) - get the next file system name from fp
    172  *		ignoring lines starting with a #.
    173  *		All leading whitespace is discarded.
    174  */
    175 
    176 static char buf[BUFSIZ];
    177 
    178 static char *
    179 getfs(fp)
    180 FILE *fp;
    181 {
    182 	char *s;
    183 
    184 	while (s = fgets(buf, BUFSIZ, fp)) {
    185 		while (isspace(*s))	/* leading whitespace doesn't count */
    186 			++s;
    187 		if (*s != '#') {	/* not a comment */
    188 			char *t = s;
    189 
    190 			while (!isspace(*t))	/* get the token */
    191 				++t;
    192 			*t = '\0';		/* ignore rest of line */
    193 			return (s);
    194 		}
    195 	}
    196 	return (NULL);	/* that's all, folks! */
    197 }
    198