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 }