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. 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  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  35  * @(#)lpc.c    8.3 (Berkeley) 4/28/95
  36  * $FreeBSD: src/usr.sbin/lpr/lpc/lpc.c,v 1.13.2.11 2002/07/26 03:12:07 gad Exp $
  37  * $DragonFly: src/usr.sbin/lpr/lpc/lpc.c,v 1.7 2006/01/14 22:58:18 corecode Exp $
  38  */
  39
  40 #include <sys/param.h>
  41
  42 #include <ctype.h>
  43 #include <dirent.h>
  44 #include <err.h>
  45 #include <grp.h>
  46 #include <setjmp.h>
  47 #include <signal.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <syslog.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <histedit.h>
  54
  55 #include "lp.h"
  56 #include "lpc.h"
  57 #include "extern.h"
  58
  59 #ifndef LPR_OPER
  60 #define LPR_OPER        "operator"      /* group name of lpr operators */
  61 #endif
  62
  63 /*
  64  * lpc -- line printer control program
  65  */
  66
  67 #define MAX_CMDLINE     200
  68 #define MAX_MARGV       20
  69 static int      fromatty;
  70
  71 static char     cmdline[MAX_CMDLINE];
  72 static int      margc;
  73 static char     *margv[MAX_MARGV];
  74 uid_t           uid, euid;
  75
  76 int                      main(int _argc, char **_argv);
  77 static void              cmdscanner(void);
  78 static struct cmd       *getcmd(const char *_name);
  79 static void              intr(int _signo);
  80 static void              makeargv(void);
  81 static int               ingroup(const char *_grname);
  82
  83 int
  84 main(int argc, char **argv)
  85 {
  86         struct cmd *c;
  87
  88         euid = geteuid();
  89         uid = getuid();
  90         seteuid(uid);
  91         progname = argv[0];
  92         openlog("lpd", 0, LOG_LPR);
  93
  94         if (--argc > 0) {
  95                 c = getcmd(*++argv);
  96                 if (c == (struct cmd *)-1) {
  97                         printf("?Ambiguous command\n");
  98                         exit(1);
  99                 }
 100                 if (c == 0) {
 101                         printf("?Invalid command\n");
 102                         exit(1);
 103                 }
 104                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
 105                     ingroup(LPR_OPER) == 0) {
 106                         printf("?Privileged command\n");
 107                         exit(1);
 108                 }
 109                 if (c->c_generic != 0)
 110                         generic(c->c_generic, c->c_opts, c->c_handler,
 111                             argc, argv);
 112                 else
 113                         (*c->c_handler)(argc, argv);
 114                 exit(0);
 115         }
 116         fromatty = isatty(fileno(stdin));
 117         if (!fromatty)
 118                 signal(SIGINT, intr);
 119         for (;;) {
 120                 cmdscanner();
 121         }
 122 }
 123
 124 static void
 125 intr(int signo __unused)
 126 {
 127         /* (the '__unused' is just to avoid a compile-time warning) */
 128         exit(0);
 129 }
 130
 131 static const char *
 132 lpc_prompt(void)
 133 {
 134         return ("lpc> ");
 135 }
 136
 137 /*
 138  * Command parser.
 139  */
 140 static void
 141 cmdscanner(void)
 142 {
 143         struct cmd *c;
 144         static EditLine *el;
 145         static History *hist;
 146         static HistEvent he;
 147         size_t len;
 148         int num;
 149         const char *bp;
 150
 151         num = 0;
 152         bp = NULL;
 153         el = NULL;
 154         hist = NULL;
 155         for (;;) {
 156                 if (fromatty) {
 157                         if (!el) {
 158                                 el = el_init("lpc", stdin, stdout, stderr);
 159                                 hist = history_init();
 160                                 history(hist, &he, H_SETSIZE, 100);
 161                                 el_set(el, EL_HIST, history, hist);
 162                                 el_set(el, EL_EDITOR, "emacs");
 163                                 el_set(el, EL_PROMPT, lpc_prompt);
 164                                 el_set(el, EL_SIGNAL, 1);
 165                                 el_source(el, NULL);
 166                                 /*
 167                                  * EditLine init may call 'cgetset()' to set a
 168                                  * capability-db meant for termcap (eg: to set
 169                                  * terminal type 'xterm').  Reset that now, or
 170                                  * that same db-information will be used for
 171                                  * printcap (giving us an "xterm" printer, with
 172                                  * all kinds of invalid capabilities...).
 173                                  */
 174                                 cgetset(NULL);
 175                         }
 176                         if ((bp = el_gets(el, &num)) == NULL || num == 0)
 177                                 quit(0, NULL);
 178
 179                         len = (num > MAX_CMDLINE -1) ? MAX_CMDLINE -1 : num;
 180                         memcpy(cmdline, bp, len);
 181                         cmdline[len] = 0;
 182                         history(hist, &he, H_ENTER, bp);
 183
 184                 } else {
 185                         if (fgets(cmdline, MAX_CMDLINE, stdin) == 0)
 186                                 quit(0, NULL);
 187                         if (cmdline[0] == 0 || cmdline[0] == '\n')
 188                                 break;
 189                 }
 190
 191                 makeargv();
 192                 if (margc == 0)
 193                         continue;
 194                 if (el != NULL && el_parse(el, margc, (const char **)margv) != -1)
 195                         continue;
 196
 197                 c = getcmd(margv[0]);
 198                 if (c == (struct cmd *)-1) {
 199                         printf("?Ambiguous command\n");
 200                         continue;
 201                 }
 202                 if (c == 0) {
 203                         printf("?Invalid command\n");
 204                         continue;
 205                 }
 206                 if ((c->c_opts & LPC_PRIVCMD) && getuid() &&
 207                     ingroup(LPR_OPER) == 0) {
 208                         printf("?Privileged command\n");
 209                         continue;
 210                 }
 211
 212                 /*
 213                  * Two different commands might have the same generic rtn
 214                  * (eg: "clean" and "tclean"), and just use different
 215                  * handler routines for distinct command-setup.  The handler
 216                  * routine might also be set on a generic routine for
 217                  * initial parameter processing.
 218                  */
 219                 if (c->c_generic != 0)
 220                         generic(c->c_generic, c->c_opts, c->c_handler,
 221                             margc, margv);
 222                 else
 223                         (*c->c_handler)(margc, margv);
 224         }
 225 }
 226
 227 static struct cmd *
 228 getcmd(const char *name)
 229 {
 230         const char *p, *q;
 231         struct cmd *c, *found;
 232         int nmatches, longest;
 233
 234         longest = 0;
 235         nmatches = 0;
 236         found = 0;
 237         for (c = cmdtab; (p = c->c_name); c++) {
 238                 for (q = name; *q == *p++; q++)
 239                         if (*q == 0)            /* exact match? */
 240                                 return(c);
 241                 if (!*q) {                      /* the name was a prefix */
 242                         if (q - name > longest) {
 243                                 longest = q - name;
 244                                 nmatches = 1;
 245                                 found = c;
 246                         } else if (q - name == longest)
 247                                 nmatches++;
 248                 }
 249         }
 250         if (nmatches > 1)
 251                 return((struct cmd *)-1);
 252         return(found);
 253 }
 254
 255 /*
 256  * Slice a string up into argc/argv.
 257  */
 258 static void
 259 makeargv(void)
 260 {
 261         char *cp;
 262         char **argp = margv;
 263         int n = 0;
 264
 265         margc = 0;
 266         for (cp = cmdline; *cp && (size_t)(cp - cmdline) < sizeof(cmdline) &&
 267             n < MAX_MARGV -1; n++) {
 268                 while (isspace(*cp))
 269                         cp++;
 270                 if (*cp == '\0')
 271                         break;
 272                 *argp++ = cp;
 273                 margc += 1;
 274                 while (*cp != '\0' && !isspace(*cp))
 275                         cp++;
 276                 if (*cp == '\0')
 277                         break;
 278                 *cp++ = '\0';
 279         }
 280         *argp++ = 0;
 281 }
 282
 283 #define HELPINDENT (sizeof ("directory"))
 284
 285 /*
 286  * Help command.
 287  */
 288 void
 289 help(int argc, char **argv)
 290 {
 291         struct cmd *c;
 292
 293         if (argc == 1) {
 294                 int i, j, w;
 295                 int columns, width = 0, lines;
 296
 297                 printf("Commands may be abbreviated.  Commands are:\n\n");
 298                 for (c = cmdtab; c->c_name; c++) {
 299                         int len = strlen(c->c_name);
 300
 301                         if (len > width)
 302                                 width = len;
 303                 }
 304                 width = (width + 8) &~ 7;
 305                 columns = 80 / width;
 306                 if (columns == 0)
 307                         columns = 1;
 308                 lines = (NCMDS + columns - 1) / columns;
 309                 for (i = 0; i < lines; i++) {
 310                         for (j = 0; j < columns; j++) {
 311                                 c = cmdtab + j * lines + i;
 312                                 if (c->c_name)
 313                                         printf("%s", c->c_name);
 314                                 if (c + lines >= &cmdtab[NCMDS]) {
 315                                         printf("\n");
 316                                         break;
 317                                 }
 318                                 w = strlen(c->c_name);
 319                                 while (w < width) {
 320                                         w = (w + 8) &~ 7;
 321                                         putchar('\t');
 322                                 }
 323                         }
 324                 }
 325                 return;
 326         }
 327         while (--argc > 0) {
 328                 char *arg;
 329
 330                 arg = *++argv;
 331                 c = getcmd(arg);
 332                 if (c == (struct cmd *)-1)
 333                         printf("?Ambiguous help command %s\n", arg);
 334                 else if (c == NULL)
 335                         printf("?Invalid help command %s\n", arg);
 336                 else
 337                         printf("%-*s\t%s\n", (int) HELPINDENT,
 338                                 c->c_name, c->c_help);
 339         }
 340 }
 341
 342 /*
 343  * return non-zero if the user is a member of the given group
 344  */
 345 static int
 346 ingroup(const char *grname)
 347 {
 348         static struct group *gptr=NULL;
 349         static int ngroups = 0;
 350         static gid_t groups[NGROUPS];
 351         gid_t gid;
 352         int i;
 353
 354         if (gptr == NULL) {
 355                 if ((gptr = getgrnam(grname)) == NULL) {
 356                         warnx("warning: unknown group '%s'", grname);
 357                         return(0);
 358                 }
 359                 ngroups = getgroups(NGROUPS, groups);
 360                 if (ngroups < 0)
 361                         err(1, "getgroups");
 362         }
 363         gid = gptr->gr_gid;
 364         for (i = 0; i < ngroups; i++)
 365                 if (gid == groups[i])
 366                         return(1);
 367         return(0);
 368 }
 369
 370 /*
 371  * Routine to get the information for a single printer (which will be
 372  * called by the routines which implement individual commands).
 373  * Note: This is for commands operating on a *single* printer.
 374  */
 375 struct printer *
 376 setup_myprinter(char *pwanted, struct printer *pp, int sump_opts)
 377 {
 378         int cdres, cmdstatus;
 379
 380         init_printer(pp);
 381         cmdstatus = getprintcap(pwanted, pp);
 382         switch (cmdstatus) {
 383         default:
 384                 fatal(pp, "%s", pcaperr(cmdstatus));
 385                 /* NOTREACHED */
 386         case PCAPERR_NOTFOUND:
 387                 printf("unknown printer %s\n", pwanted);
 388                 return (NULL);
 389         case PCAPERR_TCOPEN:
 390                 printf("warning: %s: unresolved tc= reference(s)", pwanted);
 391                 break;
 392         case PCAPERR_SUCCESS:
 393                 break;
 394         }
 395         if ((sump_opts & SUMP_NOHEADER) == 0)
 396                 printf("%s:\n", pp->printer);
 397
 398         if (sump_opts & SUMP_CHDIR_SD) {
 399                 seteuid(euid);
 400                 cdres = chdir(pp->spool_dir);
 401                 seteuid(uid);
 402                 if (cdres < 0) {
 403                         printf("\tcannot chdir to %s\n", pp->spool_dir);
 404                         free_printer(pp);
 405                         return (NULL);
 406                 }
 407         }
 408
 409         return (pp);
 410 }