4a1a0dbedb
- Get rid of a lot of the static variables which were shared by many routines and programs in the suite. - Create an abstract interface to the printcap database, so that other retrieval and iteration mechanisms could be developed (e.g., YP, Hesiod, or automatic retrieval from a trusted server). - Give each capability a human-readable name in addition to the historic two-character one. - Otherwise generally clean up a lot of dark corners. Many still remain. - When submitting jobs, use the official login name record (from getlogin()) if there is one, rather than reverse-mapping the uid. More to come...
330 lines
7.1 KiB
C
330 lines
7.1 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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"$Id: lpc.c,v 1.5 1997/09/24 06:47:46 charnier Exp $";
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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 "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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int top;
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uid_t uid, euid;
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jmp_buf toplevel;
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static void cmdscanner __P((int));
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static struct cmd *getcmd __P((char *));
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static void intr __P((int));
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static void makeargv __P((void));
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static int ingroup __P((char *));
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int
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main(argc, argv)
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int argc;
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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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name = 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, 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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top = setjmp(toplevel) == 0;
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if (top)
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signal(SIGINT, intr);
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for (;;) {
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cmdscanner(top);
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top = 1;
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}
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}
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static void
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intr(signo)
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int signo;
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{
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if (!fromatty)
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exit(0);
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longjmp(toplevel, 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(top)
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int top;
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{
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register struct cmd *c;
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if (!top)
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putchar('\n');
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for (;;) {
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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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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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makeargv();
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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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if (c->c_generic != 0)
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generic(c->c_generic, margc, margv);
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else
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(*c->c_handler)(margc, margv);
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}
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longjmp(toplevel, 0);
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}
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static struct cmd *
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getcmd(name)
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register char *name;
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{
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register 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()
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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 && (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(argc, argv)
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int argc;
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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", 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(grname)
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char *grname;
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{
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static struct group *gptr=NULL;
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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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if (getgroups(NGROUPS, 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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}
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