NetBSD/usr.sbin/lpr/lpc/lpc.c

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/* $NetBSD: lpc.c,v 1.10 2000/08/24 17:40:16 sommerfeld Exp $ */
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/*
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* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
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*
* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#if 0
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static char sccsid[] = "@(#)lpc.c 8.3 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: lpc.c,v 1.10 2000/08/24 17:40:16 sommerfeld Exp $");
#endif
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#endif /* not lint */
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#include <sys/param.h>
#include <dirent.h>
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#include <signal.h>
#include <setjmp.h>
#include <syslog.h>
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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
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#include <grp.h>
#include <err.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
#define LPR_OPER "operator" /* group name of lpr operators */
#endif
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/*
* lpc -- line printer control program
*/
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#define MAX_CMDLINE 200
#define MAX_MARGV 20
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int fromatty;
char cmdline[MAX_CMDLINE];
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int margc;
char *margv[MAX_MARGV];
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int top;
uid_t uid, euid;
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jmp_buf toplevel;
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static void cmdscanner __P((int));
static struct cmd *getcmd __P((char *));
static void intr __P((int));
static void makeargv __P((void));
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static int ingroup __P((char *));
int main __P((int, char *p[]));
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int
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main(argc, argv)
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int argc;
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char *argv[];
{
struct cmd *c;
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euid = geteuid();
uid = getuid();
seteuid(uid);
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name = argv[0];
openlog("lpd", 0, LOG_LPR);
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);
}
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if (c->c_priv && getuid() && ingroup(LPR_OPER) == 0) {
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printf("?Privileged command\n");
exit(1);
}
(*c->c_handler)(argc, argv);
exit(0);
}
fromatty = isatty(fileno(stdin));
top = setjmp(toplevel) == 0;
if (top)
signal(SIGINT, intr);
for (;;) {
cmdscanner(top);
top = 1;
}
}
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static void
intr(signo)
int signo;
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{
if (!fromatty)
exit(0);
longjmp(toplevel, 1);
}
/*
* Command parser.
*/
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static void
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cmdscanner(top)
int top;
{
struct cmd *c;
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if (!top)
putchar('\n');
for (;;) {
if (fromatty) {
printf("lpc> ");
fflush(stdout);
}
if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
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quit(0, NULL);
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if (cmdline[0] == 0 || cmdline[0] == '\n')
break;
makeargv();
c = getcmd(margv[0]);
if (c == (struct cmd *)-1) {
printf("?Ambiguous command\n");
continue;
}
if (c == 0) {
printf("?Invalid command\n");
continue;
}
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if (c->c_priv && getuid() && ingroup(LPR_OPER) == 0) {
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printf("?Privileged command\n");
continue;
}
(*c->c_handler)(margc, margv);
}
longjmp(toplevel, 0);
}
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static struct cmd *
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getcmd(name)
char *name;
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{
char *p, *q;
struct cmd *c, *found;
int nmatches, longest;
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longest = 0;
nmatches = 0;
found = 0;
for (c = cmdtab; (p = c->c_name) != NULL; c++) {
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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.
*/
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static void
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makeargv()
{
char *cp;
char **argp = margv;
int n = 0;
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margc = 0;
for (cp = cmdline; *cp && (cp - cmdline) < sizeof(cmdline) &&
n < MAX_MARGV; n++) {
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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.
*/
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void
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help(argc, argv)
int argc;
char *argv[];
{
struct cmd *c;
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if (argc == 1) {
int i, j, w;
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int columns, width = 0, lines;
printf("Commands may be abbreviated. Commands are:\n\n");
for (c = cmdtab; c->c_name; 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;
if (c->c_name)
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) {
char *arg;
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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
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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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/*
* return non-zero if the user is a member of the given group
*/
static int
ingroup(grname)
char *grname;
{
static struct group *gptr=NULL;
static gid_t groups[NGROUPS];
gid_t gid;
int i, ngroups;
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if (gptr == NULL) {
if ((gptr = getgrnam(grname)) == NULL) {
warnx("Warning: unknown group `%s'\n",
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grname);
return(0);
}
ngroups = getgroups(NGROUPS, groups);
if (ngroups < 0)
err(1, "getgroups");
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}
gid = gptr->gr_gid;
for (i = 0; i < ngroups; i++)
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if (gid == groups[i])
return(1);
return(0);
}