usr.sbin/lpr/lpc/lpc.c

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