363 lines
8.1 KiB
C
363 lines
8.1 KiB
C
/*
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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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[] = "@(#)lpc.c 8.3 (Berkeley) 4/28/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <err.h>
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#include <grp.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <string.h>
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#include <unistd.h>
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#include <histedit.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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static int fromatty;
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static char cmdline[MAX_CMDLINE];
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static int margc;
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static char *margv[MAX_MARGV];
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uid_t uid, euid;
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int main(int _argc, char *_argv[]);
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static void cmdscanner(void);
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static struct cmd *getcmd(const char *_name);
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static void intr(int _signo);
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static void makeargv(void);
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static int ingroup(const char *_grname);
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int
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main(int argc, char *argv[])
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{
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register struct cmd *c;
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euid = geteuid();
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uid = getuid();
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seteuid(uid);
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progname = argv[0];
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openlog("lpd", 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 && getuid() && 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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if (c->c_generic != 0)
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generic(c->c_generic, c->c_handler, argc, argv);
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else
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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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if (!fromatty)
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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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}
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static void
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intr(int signo __unused)
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{
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/* (the '__unused' is just to avoid a compile-time warning) */
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exit(0);
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}
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static const char *
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lpc_prompt(void)
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{
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return ("lpc> ");
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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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register struct cmd *c;
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static EditLine *el;
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static History *hist;
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size_t len;
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int num;
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const char *bp;
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num = 0;
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bp = NULL;
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el = NULL;
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hist = NULL;
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for (;;) {
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if (fromatty) {
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if (!el) {
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el = el_init("lpc", stdin, stdout);
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hist = history_init();
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history(hist, H_EVENT, 100);
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el_set(el, EL_HIST, history, hist);
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el_set(el, EL_EDITOR, "emacs");
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el_set(el, EL_PROMPT, lpc_prompt);
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el_set(el, EL_SIGNAL, 1);
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el_source(el, NULL);
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}
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if ((bp = el_gets(el, &num)) == NULL || num == 0)
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quit(0, NULL);
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len = (num > MAX_CMDLINE) ? MAX_CMDLINE : num;
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memcpy(cmdline, bp, len);
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cmdline[len] = 0;
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history(hist, H_ENTER, bp);
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} else {
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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')
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break;
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}
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makeargv();
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if (margc == 0)
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continue;
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if (el_parse(el, margc, margv) != -1)
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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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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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/*
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* Two different commands might have the same generic rtn
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* (eg: "clean" and "tclean"), and just use different
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* handler routines for distinct command-setup. The handler
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* routine might also be set on a generic routine for
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* initial parameter processing.
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*/
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if (c->c_generic != 0)
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generic(c->c_generic, c->c_handler, margc, margv);
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else
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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(const char *name)
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{
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register const char *p, *q;
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register struct cmd *c, *found;
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register 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); 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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register char *cp;
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register char **argp = margv;
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register int n = 0;
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margc = 0;
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for (cp = cmdline; *cp && (size_t)(cp - cmdline) < sizeof(cmdline) &&
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n < MAX_MARGV; n++) {
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while (isspace(*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(*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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*argp++ = 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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register struct cmd *c;
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if (argc == 1) {
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register 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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register 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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/*
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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(const char *grname)
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{
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static struct group *gptr=NULL;
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static int ngroups = 0;
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static gid_t groups[NGROUPS];
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register gid_t gid;
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register 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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ngroups = getgroups(NGROUPS, groups);
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if (ngroups < 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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}
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