dfshares.c revision 8c332a0dd4225c1d5b651b04a5df22040d918bf7
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* generic interface to dfshares, dfmounts.
*
* usage: dfshares [-F fstype] [-o fs_options] [-h] [ args ]
*
* exec's /usr/lib/fs/<fstype>/<cmd>
* <cmd> is the basename of the command.
*
* if -F is missing, fstype is the first entry in /etc/dfs/fstypes
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <wait.h>
#include <stdlib.h>
#define DFSTYPES "/etc/dfs/fstypes" /* dfs list */
#define FSCMD "/usr/lib/fs/%s/%s"
/*
* non-[arg...] elements in new argv list:
* cmd name, , -h, -o, opts, (char *)0 terminator
*/
#define ARGVPAD 5
static char *getfs(FILE *);
static int invalid(const char *, FILE *);
int
main(int argc, char **argv)
{
FILE *dfp; /* fp for dfs list */
int c, err = 0;
char subcmd[BUFSIZ]; /* fs specific command */
char *cmd; /* basename of this command */
char *fsname = NULL; /* file system name */
char *opts = NULL; /* -o options */
char **nargv; /* new argv list */
int hflag = 0;
int nargc = 0; /* new argc */
pid_t pid; /* pid for fork */
int retval; /* exit status from exec'd commad */
int showall = (argc <= 1); /* show all resources */
static char usage[] =
"usage: %s [-F fstype] [-h] [-o fs_options ] [arg ...]\n";
cmd = strrchr(argv[0], '/'); /* find the basename */
if (cmd)
++cmd;
else
cmd = argv[0];
while ((c = getopt(argc, argv, "hF:o:")) != -1)
switch (c) {
case 'h':
hflag = 1; /* no header ... pass to subcommand */
break;
case 'F':
err |= (fsname != NULL); /* at most one -F */
fsname = optarg;
break;
case 'o': /* fs specific options */
err |= (opts != NULL); /* at most one -o */
opts = optarg;
break;
case '?':
err = 1;
break;
}
if (err) {
(void) fprintf(stderr, usage, cmd);
exit(1);
}
if ((dfp = fopen(DFSTYPES, "r")) == NULL) {
(void) fprintf(stderr, "%s: cannot open %s\n", cmd, DFSTYPES);
exit(1);
}
/* allocate a block for the new argv list */
if (!(nargv = (char **)malloc(sizeof (char *)*(argc-optind+ARGVPAD)))) {
(void) fprintf(stderr, "%s: malloc failed.\n", cmd);
exit(1);
}
nargv[nargc++] = cmd;
if (hflag)
nargv[nargc++] = "-h";
if (opts) {
nargv[nargc++] = "-o";
nargv[nargc++] = opts;
}
for (; optind <= argc; ++optind) /* this copies the last NULL */
nargv[nargc++] = argv[optind];
if (showall) { /* command with no args -- show all dfs's */
while (fsname = getfs(dfp)) {
(void) snprintf(subcmd, sizeof (subcmd),
FSCMD, fsname, cmd);
switch (pid = fork()) { /* do the subcommand */
case 0:
(void) execvp(subcmd, nargv);
if (errno != ENOENT)
perror(subcmd);
_exit(1);
/*NOTREACHED*/
default:
while (wait(&retval) != pid)
;
/* take exit status into account */
err |= (retval & 0xff00) >> 8;
break;
case -1:
(void) fprintf(stderr,
"%s: fork failed - try again later.\n",
cmd);
exit(1);
}
}
(void) fclose(dfp);
if (pid == 0) { /* we never got into the loop! */
(void) fprintf(stderr,
"%s: no file systems in %s\n",
cmd, DFSTYPES);
(void) fprintf(stderr, usage, cmd);
exit(1);
}
else
exit(err);
}
if (fsname) { /* generate fs specific command name */
if (invalid(fsname, dfp)) { /* valid ? */
(void) fprintf(stderr,
"%s: invalid file system name\n", cmd);
(void) fprintf(stderr, usage, cmd);
exit(1);
}
else
(void) snprintf(subcmd, sizeof (subcmd),
FSCMD, fsname, cmd);
} else if (fsname = getfs(dfp)) /* use 1st line in dfstypes */
(void) snprintf(subcmd, sizeof (subcmd), FSCMD, fsname, cmd);
else {
(void) fprintf(stderr,
"%s: no file systems in %s\n", cmd, DFSTYPES);
(void) fprintf(stderr, usage, cmd);
exit(1);
}
(void) execvp(subcmd, nargv);
perror(subcmd); /* execvp failed */
return (1);
}
/*
* invalid(name, f) - return non-zero if name is not in
* the list of fs names in file f
*/
static int
invalid(const char *name, /* file system name */
FILE *f) /* file of list of file system types */
{
char *s;
while (s = getfs(f)) /* while there's still hope ... */
if (strcmp(s, name) == 0)
return (0); /* we got it! */
return (1);
}
/*
* getfs(fp) - get the next file system name from fp
* ignoring lines starting with a #.
* All leading whitespace is discarded.
*/
static char buf[BUFSIZ];
static char *
getfs(FILE *fp)
{
register char *s;
while (s = fgets(buf, BUFSIZ, fp)) {
while (isspace(*s)) /* leading whitespace doesn't count */
++s;
if (*s != '#') { /* not a comment */
char *t = s;
while (!isspace(*t)) /* get the token */
++t;
*t = '\0'; /* ignore rest of line */
return (s);
}
}
return (NULL); /* that's all, folks! */
}