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