NetBSD/usr.sbin/timed/timedc/timedc.c

267 lines
5.8 KiB
C

/*
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)timedc.c 2.10 (Berkeley) 3/5/91";
#endif /* not lint */
#include "timedc.h"
#include <signal.h>
#include <ctype.h>
#include <setjmp.h>
#include <syslog.h>
int top;
int margc;
int fromatty;
char *margv[20];
char cmdline[200];
jmp_buf toplevel;
void intr();
int priv_resources();
struct cmd *getcmd();
main(argc, argv)
char *argv[];
{
register struct cmd *c;
openlog("timedc", LOG_ODELAY, LOG_AUTH);
/*
* security dictates!
*/
if (priv_resources() < 0) {
fprintf(stderr, "Could not get privileged resources\n");
exit(1);
}
(void) setuid(getuid());
if (--argc > 0) {
c = getcmd(*++argv);
if (c == (struct cmd *)-1) {
printf("?Ambiguous command\n");
exit(1);
}
if (c == 0) {
printf("?Invalid command\n");
exit(1);
}
if (c->c_priv && getuid()) {
printf("?Privileged command\n");
exit(1);
}
(*c->c_handler)(argc, argv);
exit(0);
}
fromatty = isatty(fileno(stdin));
top = setjmp(toplevel) == 0;
if (top)
(void) signal(SIGINT, intr);
for (;;) {
cmdscanner(top);
top = 1;
}
}
void
intr()
{
if (!fromatty)
exit(0);
longjmp(toplevel, 1);
}
/*
* Command parser.
*/
cmdscanner(top)
int top;
{
register struct cmd *c;
extern int help();
if (!top)
putchar('\n');
for (;;) {
if (fromatty) {
printf("timedc> ");
(void) fflush(stdout);
}
if (fgets(cmdline, sizeof(cmdline), stdin) == 0)
quit();
if (cmdline[0] == 0)
break;
makeargv();
c = getcmd(margv[0]);
if (c == (struct cmd *)-1) {
printf("?Ambiguous command\n");
continue;
}
if (c == 0) {
printf("?Invalid command\n");
continue;
}
if (c->c_priv && getuid()) {
printf("?Privileged command\n");
continue;
}
(*c->c_handler)(margc, margv);
}
longjmp(toplevel, 0);
}
struct cmd *
getcmd(name)
register char *name;
{
register char *p, *q;
register struct cmd *c, *found;
register int nmatches, longest;
extern struct cmd cmdtab[];
extern int NCMDS;
longest = 0;
nmatches = 0;
found = 0;
for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
p = c->c_name;
for (q = name; *q == *p++; q++)
if (*q == 0) /* exact match? */
return(c);
if (!*q) { /* the name was a prefix */
if (q - name > longest) {
longest = q - name;
nmatches = 1;
found = c;
} else if (q - name == longest)
nmatches++;
}
}
if (nmatches > 1)
return((struct cmd *)-1);
return(found);
}
/*
* Slice a string up into argc/argv.
*/
makeargv()
{
register char *cp;
register char **argp = margv;
margc = 0;
for (cp = cmdline; *cp;) {
while (isspace(*cp))
cp++;
if (*cp == '\0')
break;
*argp++ = cp;
margc += 1;
while (*cp != '\0' && !isspace(*cp))
cp++;
if (*cp == '\0')
break;
*cp++ = '\0';
}
*argp++ = 0;
}
#define HELPINDENT (sizeof ("directory"))
/*
* Help command.
*/
help(argc, argv)
int argc;
char *argv[];
{
register struct cmd *c;
extern struct cmd cmdtab[];
if (argc == 1) {
register int i, j, w;
int columns, width = 0, lines;
extern int NCMDS;
printf("Commands may be abbreviated. Commands are:\n\n");
for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
int len = strlen(c->c_name);
if (len > width)
width = len;
}
width = (width + 8) &~ 7;
columns = 80 / width;
if (columns == 0)
columns = 1;
lines = (NCMDS + columns - 1) / columns;
for (i = 0; i < lines; i++) {
for (j = 0; j < columns; j++) {
c = cmdtab + j * lines + i;
printf("%s", c->c_name);
if (c + lines >= &cmdtab[NCMDS]) {
printf("\n");
break;
}
w = strlen(c->c_name);
while (w < width) {
w = (w + 8) &~ 7;
putchar('\t');
}
}
}
return;
}
while (--argc > 0) {
register char *arg;
arg = *++argv;
c = getcmd(arg);
if (c == (struct cmd *)-1)
printf("?Ambiguous help command %s\n", arg);
else if (c == (struct cmd *)0)
printf("?Invalid help command %s\n", arg);
else
printf("%-*s\t%s\n", HELPINDENT,
c->c_name, c->c_help);
}
}