GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/lpr/lpc/lpc.c Lines: 0 115 0.0 %
Date: 2017-11-13 Branches: 0 92 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: lpc.c,v 1.20 2016/03/16 15:41:11 krw Exp $	*/
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/*	$NetBSD: lpc.c,v 1.11 2001/11/14 03:01:15 enami Exp $	*/
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/*
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 * Copyright (c) 1983, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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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 <dirent.h>
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#include <signal.h>
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#include <syslog.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <ctype.h>
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#include <string.h>
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#include <grp.h>
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#include "lp.h"
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#include "lpc.h"
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#include "extern.h"
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#ifndef LPR_OPER
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#define LPR_OPER	"operator"	/* group name of lpr operators */
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#endif
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/*
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 * lpc -- line printer control program
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 */
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#define MAX_CMDLINE	200
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#define MAX_MARGV	20
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int	fromatty;
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char	cmdline[MAX_CMDLINE];
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int	margc;
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char	*margv[MAX_MARGV];
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static void		 cmdscanner(void);
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static struct cmd	*getcmd(char *);
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static void		 intr(int);
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static void		 makeargv(void);
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static int		 ingroup(char *);
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int
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main(int argc, char **argv)
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{
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	struct cmd *c;
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	effective_uid = geteuid();
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	real_uid = getuid();
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	effective_gid = getegid();
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	real_gid = getgid();
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	PRIV_END;	/* be safe */
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	openlog("lpc", 0, LOG_LPR);
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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(1);
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		}
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		if (c == 0) {
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			printf("?Invalid command\n");
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			exit(1);
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		}
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		if (c->c_priv && real_uid && ingroup(LPR_OPER) == 0) {
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			printf("?Privileged command\n");
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			exit(1);
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		}
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		(*c->c_handler)(argc, argv);
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		exit(0);
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	}
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	fromatty = isatty(fileno(stdin));
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	signal(SIGINT, intr);
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	for (;;)
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		cmdscanner();
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}
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volatile sig_atomic_t gotintr;
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static void
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intr(int signo)
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{
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	if (!fromatty)
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		_exit(0);
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	gotintr = 1;
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}
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/*
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 * Command parser.
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 */
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static void
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cmdscanner(void)
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{
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	struct cmd *c;
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	for (;;) {
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		if (gotintr) {
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			putchar('\n');
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			gotintr = 0;
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		}
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		if (fromatty) {
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			printf("lpc> ");
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			fflush(stdout);
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		}
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		siginterrupt(SIGINT, 1);
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		if (fgets(cmdline, MAX_CMDLINE, stdin) == NULL) {
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			if (errno == EINTR && gotintr) {
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				siginterrupt(SIGINT, 0);
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				return;
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			}
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			siginterrupt(SIGINT, 0);
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			quit(0, NULL);
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		}
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		siginterrupt(SIGINT, 0);
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		makeargv();
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		if (margc == 0)
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			break;
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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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		if (c->c_priv && getuid() && ingroup(LPR_OPER) == 0) {
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			printf("?Privileged 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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}
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static struct cmd *
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getcmd(char *name)
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{
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	char *p, *q;
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	struct cmd *c, *found;
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	int nmatches, longest;
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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; (p = c->c_name) != NULL; c++) {
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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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static void
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makeargv(void)
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{
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	char *cp = cmdline;
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	char **ap = margv;
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	margc = 0;
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	while (margc < MAX_MARGV - 1 && (*ap = strsep(&cp, " \t\n")) != NULL) {
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		if (**ap != '\0') {
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			ap++;
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			margc++;
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		}
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	}
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	*ap = NULL;
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}
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#define HELPINDENT ((int)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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	struct cmd *c;
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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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		printf("Commands may be abbreviated.  Commands are:\n\n");
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		for (c = cmdtab; c->c_name; 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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				if (c->c_name)
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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 == NULL)
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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", HELPINDENT,
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				c->c_name, c->c_help);
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	}
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}
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/*
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 * return non-zero if the user is a member of the given group
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 */
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static int
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ingroup(char *grname)
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{
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	static struct group *gptr = NULL;
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	static gid_t groups[NGROUPS_MAX];
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	static int ngroups;
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	gid_t gid;
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	int i;
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	if (gptr == NULL) {
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		if ((gptr = getgrnam(grname)) == NULL) {
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			warnx("Warning: unknown group `%s'", grname);
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			return(0);
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		}
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		if ((ngroups = getgroups(NGROUPS_MAX, groups)) < 0)
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			err(1, "getgroups");
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	}
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	gid = gptr->gr_gid;
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	for (i = 0; i < ngroups; i++)
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		if (gid == groups[i])
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			return(1);
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	return(0);
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}