290 lines
6.3 KiB
C
290 lines
6.3 KiB
C
/* $NetBSD: timedc.c,v 1.21 2008/07/21 13:37:00 lukem Exp $ */
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/*-
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* Copyright (c) 1985, 1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1985, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)timedc.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: timedc.c,v 1.21 2008/07/21 13:37:00 lukem Exp $");
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#endif
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#endif /* not lint */
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#include "timedc.h"
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#include <ctype.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <err.h>
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int trace = 0;
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FILE *fd = 0;
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int margc;
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int fromatty;
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#define MAX_MARGV 20
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char *margv[MAX_MARGV];
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char cmdline[200];
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jmp_buf toplevel;
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static const struct cmd *getcmd(char *);
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static int drop_privileges(void);
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int
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main(int argc, char *argv[])
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{
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const struct cmd *c;
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fcntl(3, F_CLOSEM);
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openlog("timedc", 0, LOG_AUTH);
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/*
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* security dictates!
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*/
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if (priv_resources() < 0)
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errx(EXIT_FAILURE, "Could not get privileged resources");
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if (drop_privileges() < 0)
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errx(EXIT_FAILURE, "Could not drop privileges");
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if (--argc > 0) {
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c = getcmd(*++argv);
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if (c == (struct cmd *)-1) {
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printf("?Ambiguous command\n");
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exit(EXIT_FAILURE);
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}
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if (c == 0) {
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printf("?Invalid command\n");
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exit(EXIT_FAILURE);
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}
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(*c->c_handler)(argc, argv);
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exit(EXIT_SUCCESS);
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}
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fromatty = isatty(fileno(stdin));
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if (setjmp(toplevel))
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putchar('\n');
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(void) signal(SIGINT, intr);
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for (;;) {
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if (fromatty) {
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printf("timedc> ");
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(void) fflush(stdout);
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}
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if (fgets(cmdline, sizeof(cmdline), stdin) == 0)
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quit(0, NULL);
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if (cmdline[0] == 0)
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break;
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if (makeargv()) {
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printf("?Too many arguments\n");
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continue;
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}
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if (margv[0] == 0)
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continue;
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c = getcmd(margv[0]);
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if (c == (struct cmd *)-1) {
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printf("?Ambiguous command\n");
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continue;
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}
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if (c == 0) {
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printf("?Invalid command\n");
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continue;
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}
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(*c->c_handler)(margc, margv);
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}
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return 0;
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}
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void
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intr(int signo)
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{
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(void) signo;
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if (!fromatty)
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exit(EXIT_SUCCESS);
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longjmp(toplevel, 1);
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}
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static const struct cmd *
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getcmd(char *name)
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{
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const char *p;
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char *q;
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const struct cmd *c, *found;
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int nmatches, longest;
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extern const struct cmd cmdtab[];
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extern int NCMDS;
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longest = 0;
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nmatches = 0;
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found = 0;
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for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
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p = c->c_name;
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for (q = name; *q == *p++; q++)
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if (*q == 0) /* exact match? */
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return(c);
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if (!*q) { /* the name was a prefix */
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if (q - name > longest) {
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longest = q - name;
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nmatches = 1;
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found = c;
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} else if (q - name == longest)
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nmatches++;
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}
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}
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if (nmatches > 1)
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return((struct cmd *)-1);
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return(found);
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}
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/*
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* Slice a string up into argc/argv.
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*/
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int
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makeargv(void)
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{
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char *cp;
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char **argp = margv;
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margc = 0;
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for (cp = cmdline; argp < &margv[MAX_MARGV - 1] && *cp;) {
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while (isspace((unsigned char)*cp))
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cp++;
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if (*cp == '\0')
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break;
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*argp++ = cp;
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margc += 1;
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while (*cp != '\0' && !isspace((unsigned char)*cp))
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cp++;
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if (*cp == '\0')
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break;
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*cp++ = '\0';
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}
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if (margc == MAX_MARGV - 1)
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return 1;
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*argp++ = 0;
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return 0;
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}
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#define HELPINDENT (sizeof ("directory"))
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/*
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* Help command.
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*/
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void
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help(int argc, char *argv[])
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{
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const struct cmd *c;
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extern const struct cmd cmdtab[];
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if (argc == 1) {
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int i, j, w;
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int columns, width = 0, lines;
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extern int NCMDS;
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printf("Commands may be abbreviated. Commands are:\n\n");
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for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
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int len = strlen(c->c_name);
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if (len > width)
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width = len;
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}
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width = (width + 8) &~ 7;
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columns = 80 / width;
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if (columns == 0)
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columns = 1;
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lines = (NCMDS + columns - 1) / columns;
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for (i = 0; i < lines; i++) {
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for (j = 0; j < columns; j++) {
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c = cmdtab + j * lines + i;
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printf("%s", c->c_name);
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if (c + lines >= &cmdtab[NCMDS]) {
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printf("\n");
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break;
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}
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w = strlen(c->c_name);
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while (w < width) {
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w = (w + 8) &~ 7;
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putchar('\t');
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}
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}
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}
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return;
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}
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while (--argc > 0) {
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char *arg;
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arg = *++argv;
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c = getcmd(arg);
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if (c == (struct cmd *)-1)
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printf("?Ambiguous help command %s\n", arg);
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else if (c == (struct cmd *)0)
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printf("?Invalid help command %s\n", arg);
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else
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printf("%-*s\t%s\n", (int)HELPINDENT,
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c->c_name, c->c_help);
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}
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}
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static int
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drop_privileges(void)
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{
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static const char user[] = "_timedc";
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const struct passwd *pw;
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uid_t uid;
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gid_t gid;
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if ((pw = getpwnam(user)) == NULL) {
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warnx("getpwnam(\"%s\") failed", user);
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return -1;
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}
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uid = pw->pw_uid;
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gid = pw->pw_gid;
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if (setgroups(1, &gid)) {
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warn("setgroups");
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return -1;
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}
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if (setgid(gid)) {
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warn("setgid");
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return -1;
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}
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if (setuid(uid)) {
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warn("setuid");
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return -1;
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}
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return 0;
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}
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