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1 /*
2  * Copyright (c) 1983, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  * 3. All advertising materials mentioning features or use of this software
15  *    must display the following acknowledgement:
16  *      This product includes software developed by the University of
17  *      California, Berkeley and its contributors.
18  * 4. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34
35 #ifndef lint
36 static const char copyright[] =
37 "@(#) Copyright (c) 1983, 1993\n\
38         The Regents of the University of California.  All rights reserved.\n";
39 #endif /* not lint */
40
41 #if 0
42 #ifndef lint
43 static char sccsid[] = "@(#)lpc.c       8.3 (Berkeley) 4/28/95";
44 #endif /* not lint */
45 #endif
46
47 #include "lp.cdefs.h"           /* A cross-platform version of <sys/cdefs.h> */
48 __FBSDID("$FreeBSD$");
49
50 #include <sys/param.h>
51
52 #include <ctype.h>
53 #include <dirent.h>
54 #include <err.h>
55 #include <grp.h>
56 #include <setjmp.h>
57 #include <signal.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <syslog.h>
61 #include <string.h>
62 #include <unistd.h>
63 #include <histedit.h>
64
65 #include "lp.h"
66 #include "lpc.h"
67 #include "extern.h"
68
69 #ifndef LPR_OPER
70 #define LPR_OPER        "operator"      /* group name of lpr operators */
71 #endif
72
73 /*
74  * lpc -- line printer control program
75  */
76
77 #define MAX_CMDLINE     200
78 #define MAX_MARGV       20
79 static int      fromatty;
80
81 static char     cmdline[MAX_CMDLINE];
82 static int      margc;
83 static char     *margv[MAX_MARGV];
84 uid_t           uid, euid;
85
86 int                      main(int _argc, char *_argv[]);
87 static void              cmdscanner(void);
88 static struct cmd       *getcmd(const char *_name);
89 static void              intr(int _signo);
90 static void              makeargv(void);
91 static int               ingroup(const char *_grname);
92
93 int
94 main(int argc, char *argv[])
95 {
96         register struct cmd *c;
97
98         euid = geteuid();
99         uid = getuid();
100         seteuid(uid);
101         progname = argv[0];
102         openlog("lpd", 0, LOG_LPR);
103
104         if (--argc > 0) {
105                 c = getcmd(*++argv);
106                 if (c == (struct cmd *)-1) {
107                         printf("?Ambiguous command\n");
108                         exit(1);
109                 }
110                 if (c == 0) {
111                         printf("?Invalid command\n");
112                         exit(1);
113                 }
114                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
115                     ingroup(LPR_OPER) == 0) {
116                         printf("?Privileged command\n");
117                         exit(1);
118                 }
119                 if (c->c_generic != 0)
120                         generic(c->c_generic, c->c_opts, c->c_handler,
121                             argc, argv);
122                 else
123                         (*c->c_handler)(argc, argv);
124                 exit(0);
125         }
126         fromatty = isatty(fileno(stdin));
127         if (!fromatty)
128                 signal(SIGINT, intr);
129         for (;;) {
130                 cmdscanner();
131         }
132 }
133
134 static void
135 intr(int signo __unused)
136 {
137         /* (the '__unused' is just to avoid a compile-time warning) */
138         exit(0);
139 }
140
141 static const char *
142 lpc_prompt(void)
143 {
144         return ("lpc> ");
145 }
146
147 /*
148  * Command parser.
149  */
150 static void
151 cmdscanner(void)
152 {
153         register struct cmd *c;
154         static EditLine *el;
155         static History *hist;
156         HistEvent he;
157         size_t len;
158         int num;
159         const char *bp;
160
161         num = 0;
162         bp = NULL;
163         el = NULL;
164         hist = NULL;
165         for (;;) {
166                 if (fromatty) {
167                         if (!el) {
168                                 el = el_init("lpc", stdin, stdout, stderr);
169                                 hist = history_init();
170                                 history(hist, &he, H_SETSIZE, 100);
171                                 el_set(el, EL_HIST, history, hist);
172                                 el_set(el, EL_EDITOR, "emacs");
173                                 el_set(el, EL_PROMPT, lpc_prompt);
174                                 el_set(el, EL_SIGNAL, 1);
175                                 el_source(el, NULL);
176                                 /*
177                                  * EditLine init may call 'cgetset()' to set a
178                                  * capability-db meant for termcap (eg: to set
179                                  * terminal type 'xterm').  Reset that now, or
180                                  * that same db-information will be used for
181                                  * printcap (giving us an "xterm" printer, with
182                                  * all kinds of invalid capabilities...).
183                                  */
184                                 cgetset(NULL);
185                         }
186                         if ((bp = el_gets(el, &num)) == NULL || num == 0)
187                                 quit(0, NULL);
188
189                         len = (num > MAX_CMDLINE - 1) ? MAX_CMDLINE - 1 : num;
190                         memcpy(cmdline, bp, len);
191                         cmdline[len] = 0; 
192                         history(hist, &he, H_ENTER, bp);
193
194                 } else {
195                         if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
196                                 quit(0, NULL);
197                         if (cmdline[0] == 0 || cmdline[0] == '\n')
198                                 break;
199                 }
200
201                 makeargv();
202                 if (margc == 0)
203                         continue;
204                 if (el != NULL && el_parse(el, margc, margv) != -1)
205                         continue;
206
207                 c = getcmd(margv[0]);
208                 if (c == (struct cmd *)-1) {
209                         printf("?Ambiguous command\n");
210                         continue;
211                 }
212                 if (c == 0) {
213                         printf("?Invalid command\n");
214                         continue;
215                 }
216                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
217                     ingroup(LPR_OPER) == 0) {
218                         printf("?Privileged command\n");
219                         continue;
220                 }
221
222                 /*
223                  * Two different commands might have the same generic rtn
224                  * (eg: "clean" and "tclean"), and just use different
225                  * handler routines for distinct command-setup.  The handler
226                  * routine might also be set on a generic routine for
227                  * initial parameter processing.
228                  */
229                 if (c->c_generic != 0)
230                         generic(c->c_generic, c->c_opts, c->c_handler,
231                             margc, margv);
232                 else
233                         (*c->c_handler)(margc, margv);
234         }
235 }
236
237 static struct cmd *
238 getcmd(const char *name)
239 {
240         register const char *p, *q;
241         register struct cmd *c, *found;
242         register int nmatches, longest;
243
244         longest = 0;
245         nmatches = 0;
246         found = 0;
247         for (c = cmdtab; (p = c->c_name); c++) {
248                 for (q = name; *q == *p++; q++)
249                         if (*q == 0)            /* exact match? */
250                                 return(c);
251                 if (!*q) {                      /* the name was a prefix */
252                         if (q - name > longest) {
253                                 longest = q - name;
254                                 nmatches = 1;
255                                 found = c;
256                         } else if (q - name == longest)
257                                 nmatches++;
258                 }
259         }
260         if (nmatches > 1)
261                 return((struct cmd *)-1);
262         return(found);
263 }
264
265 /*
266  * Slice a string up into argc/argv.
267  */
268 static void
269 makeargv(void)
270 {
271         register char *cp;
272         register char **argp = margv;
273         register int n = 0;
274
275         margc = 0;
276         for (cp = cmdline; *cp && (size_t)(cp - cmdline) < sizeof(cmdline) &&
277             n < MAX_MARGV - 1; n++) {
278                 while (isspace(*cp))
279                         cp++;
280                 if (*cp == '\0')
281                         break;
282                 *argp++ = cp;
283                 margc += 1;
284                 while (*cp != '\0' && !isspace(*cp))
285                         cp++;
286                 if (*cp == '\0')
287                         break;
288                 *cp++ = '\0';
289         }
290         *argp++ = 0;
291 }
292
293 #define HELPINDENT (sizeof ("directory"))
294
295 /*
296  * Help command.
297  */
298 void
299 help(int argc, char *argv[])
300 {
301         register struct cmd *c;
302
303         if (argc == 1) {
304                 register int i, j, w;
305                 int columns, width = 0, lines;
306
307                 printf("Commands may be abbreviated.  Commands are:\n\n");
308                 for (c = cmdtab; c->c_name; c++) {
309                         int len = strlen(c->c_name);
310
311                         if (len > width)
312                                 width = len;
313                 }
314                 width = (width + 8) &~ 7;
315                 columns = 80 / width;
316                 if (columns == 0)
317                         columns = 1;
318                 lines = (NCMDS + columns - 1) / columns;
319                 for (i = 0; i < lines; i++) {
320                         for (j = 0; j < columns; j++) {
321                                 c = cmdtab + j * lines + i;
322                                 if (c->c_name)
323                                         printf("%s", c->c_name);
324                                 if (c + lines >= &cmdtab[NCMDS]) {
325                                         printf("\n");
326                                         break;
327                                 }
328                                 w = strlen(c->c_name);
329                                 while (w < width) {
330                                         w = (w + 8) &~ 7;
331                                         putchar('\t');
332                                 }
333                         }
334                 }
335                 return;
336         }
337         while (--argc > 0) {
338                 register char *arg;
339                 arg = *++argv;
340                 c = getcmd(arg);
341                 if (c == (struct cmd *)-1)
342                         printf("?Ambiguous help command %s\n", arg);
343                 else if (c == (struct cmd *)0)
344                         printf("?Invalid help command %s\n", arg);
345                 else
346                         printf("%-*s\t%s\n", (int) HELPINDENT,
347                                 c->c_name, c->c_help);
348         }
349 }
350
351 /*
352  * return non-zero if the user is a member of the given group
353  */
354 static int
355 ingroup(const char *grname)
356 {
357         static struct group *gptr=NULL;
358         static int ngroups = 0;
359         static long ngroups_max;
360         static gid_t *groups;
361         register gid_t gid;
362         register int i;
363
364         if (gptr == NULL) {
365                 if ((gptr = getgrnam(grname)) == NULL) {
366                         warnx("warning: unknown group '%s'", grname);
367                         return(0);
368                 }
369                 ngroups_max = sysconf(_SC_NGROUPS_MAX);
370                 if ((groups = malloc(sizeof(gid_t) * ngroups_max)) == NULL)
371                         err(1, "malloc");
372                 ngroups = getgroups(ngroups_max, groups);
373                 if (ngroups < 0)
374                         err(1, "getgroups");
375         }
376         gid = gptr->gr_gid;
377         for (i = 0; i < ngroups; i++)
378                 if (gid == groups[i])
379                         return(1);
380         return(0);
381 }
382
383 /*
384  * Routine to get the information for a single printer (which will be
385  * called by the routines which implement individual commands).
386  * Note: This is for commands operating on a *single* printer.
387  */
388 struct printer *
389 setup_myprinter(char *pwanted, struct printer *pp, int sump_opts)
390 {
391         int cdres, cmdstatus;
392
393         init_printer(pp);
394         cmdstatus = getprintcap(pwanted, pp);
395         switch (cmdstatus) {
396         default:
397                 fatal(pp, "%s", pcaperr(cmdstatus));
398                 /* NOTREACHED */
399         case PCAPERR_NOTFOUND:
400                 printf("unknown printer %s\n", pwanted);
401                 return (NULL);
402         case PCAPERR_TCOPEN:
403                 printf("warning: %s: unresolved tc= reference(s)", pwanted);
404                 break;
405         case PCAPERR_SUCCESS:
406                 break;
407         }
408         if ((sump_opts & SUMP_NOHEADER) == 0)
409                 printf("%s:\n", pp->printer);
410
411         if (sump_opts & SUMP_CHDIR_SD) {
412                 seteuid(euid);
413                 cdres = chdir(pp->spool_dir);
414                 seteuid(uid);
415                 if (cdres < 0) {
416                         printf("\tcannot chdir to %s\n", pp->spool_dir);
417                         free_printer(pp);
418                         return (NULL);
419                 }
420         }
421
422         return (pp);
423 }