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 35 #ifndef lint 36 static const char copyright[] = 37 "@(#) Copyright (c) 1983, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)lpc.c 8.3 (Berkeley) 4/28/95"; 44 #endif 45 static const char rcsid[] = 46 "$FreeBSD: src/usr.sbin/lpr/lpc/lpc.c,v 1.13.2.11 2002/07/26 03:12:07 gad Exp $"; 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 51 #include <ctype.h> 52 #include <dirent.h> 53 #include <err.h> 54 #include <grp.h> 55 #include <setjmp.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <syslog.h> 60 #include <string.h> 61 #include <unistd.h> 62 #include <histedit.h> 63 64 #include "lp.h" 65 #include "lpc.h" 66 #include "extern.h" 67 68 #ifndef LPR_OPER 69 #define LPR_OPER "operator" /* group name of lpr operators */ 70 #endif 71 72 /* 73 * lpc -- line printer control program 74 */ 75 76 #define MAX_CMDLINE 200 77 #define MAX_MARGV 20 78 static int fromatty; 79 80 static char cmdline[MAX_CMDLINE]; 81 static int margc; 82 static char *margv[MAX_MARGV]; 83 uid_t uid, euid; 84 85 int main(int _argc, char *_argv[]); 86 static void cmdscanner(void); 87 static struct cmd *getcmd(const char *_name); 88 static void intr(int _signo); 89 static void makeargv(void); 90 static int ingroup(const char *_grname); 91 92 int 93 main(int argc, char *argv[]) 94 { 95 register struct cmd *c; 96 97 euid = geteuid(); 98 uid = getuid(); 99 seteuid(uid); 100 progname = argv[0]; 101 openlog("lpd", 0, LOG_LPR); 102 103 if (--argc > 0) { 104 c = getcmd(*++argv); 105 if (c == (struct cmd *)-1) { 106 printf("?Ambiguous command\n"); 107 exit(1); 108 } 109 if (c == 0) { 110 printf("?Invalid command\n"); 111 exit(1); 112 } 113 if ((c->c_opts & LPC_PRIVCMD) && getuid() && 114 ingroup(LPR_OPER) == 0) { 115 printf("?Privileged command\n"); 116 exit(1); 117 } 118 if (c->c_generic != 0) 119 generic(c->c_generic, c->c_opts, c->c_handler, 120 argc, argv); 121 else 122 (*c->c_handler)(argc, argv); 123 exit(0); 124 } 125 fromatty = isatty(fileno(stdin)); 126 if (!fromatty) 127 signal(SIGINT, intr); 128 for (;;) { 129 cmdscanner(); 130 } 131 } 132 133 static void 134 intr(int signo __unused) 135 { 136 /* (the '__unused' is just to avoid a compile-time warning) */ 137 exit(0); 138 } 139 140 static const char * 141 lpc_prompt(void) 142 { 143 return ("lpc> "); 144 } 145 146 /* 147 * Command parser. 148 */ 149 static void 150 cmdscanner(void) 151 { 152 register struct cmd *c; 153 static EditLine *el; 154 static History *hist; 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); 167 hist = history_init(); 168 history(hist, H_EVENT, 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 = (num > MAX_CMDLINE) ? MAX_CMDLINE : num; 188 memcpy(cmdline, bp, len); 189 cmdline[len] = 0; 190 history(hist, H_ENTER, bp); 191 192 } else { 193 if (fgets(cmdline, MAX_CMDLINE, stdin) == 0) 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_parse(el, margc, 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 == 0) { 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 != 0) 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 = 0; 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; 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++ = 0; 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 gid_t groups[NGROUPS]; 358 register gid_t gid; 359 register int i; 360 361 if (gptr == NULL) { 362 if ((gptr = getgrnam(grname)) == NULL) { 363 warnx("warning: unknown group '%s'", grname); 364 return(0); 365 } 366 ngroups = getgroups(NGROUPS, groups); 367 if (ngroups < 0) 368 err(1, "getgroups"); 369 } 370 gid = gptr->gr_gid; 371 for (i = 0; i < ngroups; i++) 372 if (gid == groups[i]) 373 return(1); 374 return(0); 375 } 376 377 /* 378 * Routine to get the information for a single printer (which will be 379 * called by the routines which implement individual commands). 380 * Note: This is for commands operating on a *single* printer. 381 */ 382 struct printer * 383 setup_myprinter(char *pwanted, struct printer *pp, int sump_opts) 384 { 385 int cdres, cmdstatus; 386 387 init_printer(pp); 388 cmdstatus = getprintcap(pwanted, pp); 389 switch (cmdstatus) { 390 default: 391 fatal(pp, "%s", pcaperr(cmdstatus)); 392 /* NOTREACHED */ 393 case PCAPERR_NOTFOUND: 394 printf("unknown printer %s\n", pwanted); 395 return (NULL); 396 case PCAPERR_TCOPEN: 397 printf("warning: %s: unresolved tc= reference(s)", pwanted); 398 break; 399 case PCAPERR_SUCCESS: 400 break; 401 } 402 if ((sump_opts & SUMP_NOHEADER) == 0) 403 printf("%s:\n", pp->printer); 404 405 if (sump_opts & SUMP_CHDIR_SD) { 406 seteuid(euid); 407 cdres = chdir(pp->spool_dir); 408 seteuid(uid); 409 if (cdres < 0) { 410 printf("\tcannot chdir to %s\n", pp->spool_dir); 411 free_printer(pp); 412 return (NULL); 413 } 414 } 415 416 return (pp); 417 } 418