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[dragonfly.git] / usr.sbin / lpr / lpc / lpc.c
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. Neither the name of the University nor the names of its contributors
15  *    may be used to endorse or promote products derived from this software
16  *    without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  *
30  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
31  * @(#)lpc.c    8.3 (Berkeley) 4/28/95
32  * $FreeBSD: src/usr.sbin/lpr/lpc/lpc.c,v 1.13.2.11 2002/07/26 03:12:07 gad Exp $
33  */
34
35 #include <sys/param.h>
36
37 #include <ctype.h>
38 #include <dirent.h>
39 #include <err.h>
40 #include <grp.h>
41 #include <setjmp.h>
42 #include <signal.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <syslog.h>
46 #include <string.h>
47 #include <unistd.h>
48 #include <histedit.h>
49
50 #include "lp.h"
51 #include "lpc.h"
52 #include "extern.h"
53
54 #ifndef LPR_OPER
55 #define LPR_OPER        "operator"      /* group name of lpr operators */
56 #endif
57
58 /*
59  * lpc -- line printer control program
60  */
61
62 #define MAX_CMDLINE     200
63 #define MAX_MARGV       20
64 static int      fromatty;
65
66 static char     cmdline[MAX_CMDLINE];
67 static int      margc;
68 static char     *margv[MAX_MARGV];
69 uid_t           uid, euid;
70
71 static void              cmdscanner(void);
72 static struct cmd       *getcmd(const char *_name);
73 static void              intr(int _signo);
74 static void              makeargv(void);
75 static int               ingroup(const char *_grname);
76
77 int
78 main(int argc, char **argv)
79 {
80         struct cmd *c;
81
82         euid = geteuid();
83         uid = getuid();
84         seteuid(uid);
85         progname = argv[0];
86         openlog("lpd", 0, LOG_LPR);
87
88         if (--argc > 0) {
89                 c = getcmd(*++argv);
90                 if (c == (struct cmd *)-1) {
91                         printf("?Ambiguous command\n");
92                         exit(1);
93                 }
94                 if (c == NULL) {
95                         printf("?Invalid command\n");
96                         exit(1);
97                 }
98                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
99                     ingroup(LPR_OPER) == 0) {
100                         printf("?Privileged command\n");
101                         exit(1);
102                 }
103                 if (c->c_generic != 0)
104                         generic(c->c_generic, c->c_opts, c->c_handler,
105                             argc, argv);
106                 else
107                         (*c->c_handler)(argc, argv);
108                 exit(0);
109         }
110         fromatty = isatty(fileno(stdin));
111         if (!fromatty)
112                 signal(SIGINT, intr);
113         for (;;) {
114                 cmdscanner();
115         }
116 }
117
118 static void
119 intr(int signo __unused)
120 {
121         /* (the '__unused' is just to avoid a compile-time warning) */
122         exit(0);
123 }
124
125 static const char *
126 lpc_prompt(void)
127 {
128         return ("lpc> ");
129 }
130
131 /*
132  * Command parser.
133  */
134 static void
135 cmdscanner(void)
136 {
137         struct cmd *c;
138         static EditLine *el;
139         static History *hist;
140         static HistEvent he;
141         size_t len;
142         int num;
143         const char *bp;
144
145         num = 0;
146         bp = NULL;
147         el = NULL;
148         hist = NULL;
149         for (;;) {
150                 if (fromatty) {
151                         if (!el) {
152                                 el = el_init("lpc", stdin, stdout, stderr);
153                                 hist = history_init();
154                                 history(hist, &he, H_SETSIZE, 100);
155                                 el_set(el, EL_HIST, history, hist);
156                                 el_set(el, EL_EDITOR, "emacs");
157                                 el_set(el, EL_PROMPT, lpc_prompt);
158                                 el_set(el, EL_SIGNAL, 1);
159                                 el_source(el, NULL);
160                                 /*
161                                  * EditLine init may call 'cgetset()' to set a
162                                  * capability-db meant for termcap (eg: to set
163                                  * terminal type 'xterm').  Reset that now, or
164                                  * that same db-information will be used for
165                                  * printcap (giving us an "xterm" printer, with
166                                  * all kinds of invalid capabilities...).
167                                  */
168                                 cgetset(NULL);
169                         }
170                         if ((bp = el_gets(el, &num)) == NULL || num == 0)
171                                 quit(0, NULL);
172
173                         len = (num > MAX_CMDLINE -1) ? MAX_CMDLINE -1 : num;
174                         memcpy(cmdline, bp, len);
175                         cmdline[len] = 0; 
176                         history(hist, &he, H_ENTER, bp);
177
178                 } else {
179                         if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
180                                 quit(0, NULL);
181                         if (cmdline[0] == 0 || cmdline[0] == '\n')
182                                 break;
183                 }
184
185                 makeargv();
186                 if (margc == 0)
187                         continue;
188                 if (el != NULL && el_parse(el, margc, (const char **)margv) != -1)
189                         continue;
190
191                 c = getcmd(margv[0]);
192                 if (c == (struct cmd *)-1) {
193                         printf("?Ambiguous command\n");
194                         continue;
195                 }
196                 if (c == NULL) {
197                         printf("?Invalid command\n");
198                         continue;
199                 }
200                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
201                     ingroup(LPR_OPER) == 0) {
202                         printf("?Privileged command\n");
203                         continue;
204                 }
205
206                 /*
207                  * Two different commands might have the same generic rtn
208                  * (eg: "clean" and "tclean"), and just use different
209                  * handler routines for distinct command-setup.  The handler
210                  * routine might also be set on a generic routine for
211                  * initial parameter processing.
212                  */
213                 if (c->c_generic != 0)
214                         generic(c->c_generic, c->c_opts, c->c_handler,
215                             margc, margv);
216                 else
217                         (*c->c_handler)(margc, margv);
218         }
219 }
220
221 static struct cmd *
222 getcmd(const char *name)
223 {
224         const char *p, *q;
225         struct cmd *c, *found;
226         int nmatches, longest;
227
228         longest = 0;
229         nmatches = 0;
230         found = NULL;
231         for (c = cmdtab; (p = c->c_name); c++) {
232                 for (q = name; *q == *p++; q++)
233                         if (*q == 0)            /* exact match? */
234                                 return(c);
235                 if (!*q) {                      /* the name was a prefix */
236                         if (q - name > longest) {
237                                 longest = q - name;
238                                 nmatches = 1;
239                                 found = c;
240                         } else if (q - name == longest)
241                                 nmatches++;
242                 }
243         }
244         if (nmatches > 1)
245                 return((struct cmd *)-1);
246         return(found);
247 }
248
249 /*
250  * Slice a string up into argc/argv.
251  */
252 static void
253 makeargv(void)
254 {
255         char *cp;
256         char **argp = margv;
257         int n = 0;
258
259         margc = 0;
260         for (cp = cmdline; *cp && (size_t)(cp - cmdline) < sizeof(cmdline) &&
261             n < MAX_MARGV -1; n++) {
262                 while (isspace(*cp))
263                         cp++;
264                 if (*cp == '\0')
265                         break;
266                 *argp++ = cp;
267                 margc += 1;
268                 while (*cp != '\0' && !isspace(*cp))
269                         cp++;
270                 if (*cp == '\0')
271                         break;
272                 *cp++ = '\0';
273         }
274         *argp++ = NULL;
275 }
276
277 #define HELPINDENT (sizeof ("directory"))
278
279 /*
280  * Help command.
281  */
282 void
283 help(int argc, char **argv)
284 {
285         struct cmd *c;
286
287         if (argc == 1) {
288                 int i, j, w;
289                 int columns, width = 0, lines;
290
291                 printf("Commands may be abbreviated.  Commands are:\n\n");
292                 for (c = cmdtab; c->c_name; c++) {
293                         int len = strlen(c->c_name);
294
295                         if (len > width)
296                                 width = len;
297                 }
298                 width = (width + 8) &~ 7;
299                 columns = 80 / width;
300                 if (columns == 0)
301                         columns = 1;
302                 lines = (NCMDS + columns - 1) / columns;
303                 for (i = 0; i < lines; i++) {
304                         for (j = 0; j < columns; j++) {
305                                 c = cmdtab + j * lines + i;
306                                 if (c->c_name)
307                                         printf("%s", c->c_name);
308                                 if (c + lines >= &cmdtab[NCMDS]) {
309                                         printf("\n");
310                                         break;
311                                 }
312                                 w = strlen(c->c_name);
313                                 while (w < width) {
314                                         w = (w + 8) &~ 7;
315                                         putchar('\t');
316                                 }
317                         }
318                 }
319                 return;
320         }
321         while (--argc > 0) {
322                 char *arg;
323
324                 arg = *++argv;
325                 c = getcmd(arg);
326                 if (c == (struct cmd *)-1)
327                         printf("?Ambiguous help command %s\n", arg);
328                 else if (c == NULL)
329                         printf("?Invalid help command %s\n", arg);
330                 else
331                         printf("%-*s\t%s\n", (int) HELPINDENT,
332                                 c->c_name, c->c_help);
333         }
334 }
335
336 /*
337  * return non-zero if the user is a member of the given group
338  */
339 static int
340 ingroup(const char *grname)
341 {
342         static struct group *gptr=NULL;
343         static int ngroups = 0;
344         static gid_t groups[NGROUPS];
345         gid_t gid;
346         int i;
347
348         if (gptr == NULL) {
349                 if ((gptr = getgrnam(grname)) == NULL) {
350                         warnx("warning: unknown group '%s'", grname);
351                         return(0);
352                 }
353                 ngroups = getgroups(NGROUPS, groups);
354                 if (ngroups < 0)
355                         err(1, "getgroups");
356         }
357         gid = gptr->gr_gid;
358         for (i = 0; i < ngroups; i++)
359                 if (gid == groups[i])
360                         return(1);
361         return(0);
362 }
363
364 /*
365  * Routine to get the information for a single printer (which will be
366  * called by the routines which implement individual commands).
367  * Note: This is for commands operating on a *single* printer.
368  */
369 struct printer *
370 setup_myprinter(char *pwanted, struct printer *pp, int sump_opts)
371 {
372         int cdres, cmdstatus;
373
374         init_printer(pp);
375         cmdstatus = getprintcap(pwanted, pp);
376         switch (cmdstatus) {
377         default:
378                 fatal(pp, "%s", pcaperr(cmdstatus));
379                 /* NOTREACHED */
380         case PCAPERR_NOTFOUND:
381                 printf("unknown printer %s\n", pwanted);
382                 return (NULL);
383         case PCAPERR_TCOPEN:
384                 printf("warning: %s: unresolved tc= reference(s)", pwanted);
385                 break;
386         case PCAPERR_SUCCESS:
387                 break;
388         }
389         if ((sump_opts & SUMP_NOHEADER) == 0)
390                 printf("%s:\n", pp->printer);
391
392         if (sump_opts & SUMP_CHDIR_SD) {
393                 seteuid(euid);
394                 cdres = chdir(pp->spool_dir);
395                 seteuid(uid);
396                 if (cdres < 0) {
397                         printf("\tcannot chdir to %s\n", pp->spool_dir);
398                         free_printer(pp);
399                         return (NULL);
400                 }
401         }
402
403         return (pp);
404 }