FreeBSD-5.3/usr.sbin/lpr/lpc/lpc.c
/*
* Copyright (c) 1983, 1993
* The 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
static const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)lpc.c 8.3 (Berkeley) 4/28/95";
#endif /* not lint */
#endif
#include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
__FBSDID("$FreeBSD: src/usr.sbin/lpr/lpc/lpc.c,v 1.28 2003/10/13 07:24:22 tjr Exp $");
#include <sys/param.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <grp.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <histedit.h>
#include "lp.h"
#include "lpc.h"
#include "extern.h"
#ifndef LPR_OPER
#define LPR_OPER "operator" /* group name of lpr operators */
#endif
/*
* lpc -- line printer control program
*/
#define MAX_CMDLINE 200
#define MAX_MARGV 20
static int fromatty;
static char cmdline[MAX_CMDLINE];
static int margc;
static char *margv[MAX_MARGV];
uid_t uid, euid;
int main(int _argc, char *_argv[]);
static void cmdscanner(void);
static struct cmd *getcmd(const char *_name);
static void intr(int _signo);
static void makeargv(void);
static int ingroup(const char *_grname);
int
main(int argc, char *argv[])
{
register struct cmd *c;
euid = geteuid();
uid = getuid();
seteuid(uid);
progname = 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);
}
if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
ingroup(LPR_OPER) == 0) {
printf("?Privileged command\n");
exit(1);
}
if (c->c_generic != 0)
generic(c->c_generic, c->c_opts, c->c_handler,
argc, argv);
else
(*c->c_handler)(argc, argv);
exit(0);
}
fromatty = isatty(fileno(stdin));
if (!fromatty)
signal(SIGINT, intr);
for (;;) {
cmdscanner();
}
}
static void
intr(int signo __unused)
{
/* (the '__unused' is just to avoid a compile-time warning) */
exit(0);
}
static const char *
lpc_prompt(void)
{
return ("lpc> ");
}
/*
* Command parser.
*/
static void
cmdscanner(void)
{
register struct cmd *c;
static EditLine *el;
static History *hist;
HistEvent he;
size_t len;
int num;
const char *bp;
num = 0;
bp = NULL;
el = NULL;
hist = NULL;
for (;;) {
if (fromatty) {
if (!el) {
el = el_init("lpc", stdin, stdout, stderr);
hist = history_init();
history(hist, &he, H_EVENT, 100);
el_set(el, EL_HIST, history, hist);
el_set(el, EL_EDITOR, "emacs");
el_set(el, EL_PROMPT, lpc_prompt);
el_set(el, EL_SIGNAL, 1);
el_source(el, NULL);
/*
* EditLine init may call 'cgetset()' to set a
* capability-db meant for termcap (eg: to set
* terminal type 'xterm'). Reset that now, or
* that same db-information will be used for
* printcap (giving us an "xterm" printer, with
* all kinds of invalid capabilities...).
*/
cgetset(NULL);
}
if ((bp = el_gets(el, &num)) == NULL || num == 0)
quit(0, NULL);
len = (num > MAX_CMDLINE - 1) ? MAX_CMDLINE - 1 : num;
memcpy(cmdline, bp, len);
cmdline[len] = 0;
history(hist, &he, H_ENTER, bp);
} else {
if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
quit(0, NULL);
if (cmdline[0] == 0 || cmdline[0] == '\n')
break;
}
makeargv();
if (margc == 0)
continue;
if (el_parse(el, margc, margv) != -1)
continue;
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_opts & LPC_PRIVCMD) && getuid() &&
ingroup(LPR_OPER) == 0) {
printf("?Privileged command\n");
continue;
}
/*
* Two different commands might have the same generic rtn
* (eg: "clean" and "tclean"), and just use different
* handler routines for distinct command-setup. The handler
* routine might also be set on a generic routine for
* initial parameter processing.
*/
if (c->c_generic != 0)
generic(c->c_generic, c->c_opts, c->c_handler,
margc, margv);
else
(*c->c_handler)(margc, margv);
}
}
static struct cmd *
getcmd(const char *name)
{
register const char *p, *q;
register struct cmd *c, *found;
register int nmatches, longest;
longest = 0;
nmatches = 0;
found = 0;
for (c = cmdtab; (p = c->c_name); c++) {
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.
*/
static void
makeargv(void)
{
register char *cp;
register char **argp = margv;
register int n = 0;
margc = 0;
for (cp = cmdline; *cp && (size_t)(cp - cmdline) < sizeof(cmdline) &&
n < MAX_MARGV - 1; n++) {
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.
*/
void
help(int argc, char *argv[])
{
register struct cmd *c;
if (argc == 1) {
register int i, j, w;
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) {
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", (int) HELPINDENT,
c->c_name, c->c_help);
}
}
/*
* return non-zero if the user is a member of the given group
*/
static int
ingroup(const char *grname)
{
static struct group *gptr=NULL;
static int ngroups = 0;
static gid_t groups[NGROUPS];
register gid_t gid;
register int i;
if (gptr == NULL) {
if ((gptr = getgrnam(grname)) == NULL) {
warnx("warning: unknown group '%s'", grname);
return(0);
}
ngroups = getgroups(NGROUPS, groups);
if (ngroups < 0)
err(1, "getgroups");
}
gid = gptr->gr_gid;
for (i = 0; i < ngroups; i++)
if (gid == groups[i])
return(1);
return(0);
}
/*
* Routine to get the information for a single printer (which will be
* called by the routines which implement individual commands).
* Note: This is for commands operating on a *single* printer.
*/
struct printer *
setup_myprinter(char *pwanted, struct printer *pp, int sump_opts)
{
int cdres, cmdstatus;
init_printer(pp);
cmdstatus = getprintcap(pwanted, pp);
switch (cmdstatus) {
default:
fatal(pp, "%s", pcaperr(cmdstatus));
/* NOTREACHED */
case PCAPERR_NOTFOUND:
printf("unknown printer %s\n", pwanted);
return (NULL);
case PCAPERR_TCOPEN:
printf("warning: %s: unresolved tc= reference(s)", pwanted);
break;
case PCAPERR_SUCCESS:
break;
}
if ((sump_opts & SUMP_NOHEADER) == 0)
printf("%s:\n", pp->printer);
if (sump_opts & SUMP_CHDIR_SD) {
seteuid(euid);
cdres = chdir(pp->spool_dir);
seteuid(uid);
if (cdres < 0) {
printf("\tcannot chdir to %s\n", pp->spool_dir);
free_printer(pp);
return (NULL);
}
}
return (pp);
}