contrib/libarchive/cpio/cmdline.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  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  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27
  28 #include "cpio_platform.h"
  29 __FBSDID("$FreeBSD: src/usr.bin/cpio/cmdline.c,v 1.5 2008/12/06 07:30:40 kientzle Exp $");
  30
  31 #ifdef HAVE_ERRNO_H
  32 #include <errno.h>
  33 #endif
  34 #ifdef HAVE_GRP_H
  35 #include <grp.h>
  36 #endif
  37 #ifdef HAVE_PWD_H
  38 #include <pwd.h>
  39 #endif
  40 #include <stdio.h>
  41 #ifdef HAVE_STDLIB_H
  42 #include <stdlib.h>
  43 #endif
  44 #ifdef HAVE_STRING_H
  45 #include <string.h>
  46 #endif
  47
  48 #include "cpio.h"
  49
  50 /*
  51  * Short options for cpio.  Please keep this sorted.
  52  */
  53 static const char *short_options = "0AaBC:F:O:cdE:f:H:hI:ijLlmnopR:rtuvW:yZz";
  54
  55 /*
  56  * Long options for cpio.  Please keep this sorted.
  57  */
  58 static const struct option {
  59         const char *name;
  60         int required;   /* 1 if this option requires an argument */
  61         int equivalent; /* Equivalent short option. */
  62 } cpio_longopts[] = {
  63         { "create",                     0, 'o' },
  64         { "extract",                    0, 'i' },
  65         { "file",                       1, 'F' },
  66         { "format",                     1, 'H' },
  67         { "help",                       0, 'h' },
  68         { "insecure",                   0, OPTION_INSECURE },
  69         { "link",                       0, 'l' },
  70         { "list",                       0, 't' },
  71         { "make-directories",           0, 'd' },
  72         { "no-preserve-owner",          0, OPTION_NO_PRESERVE_OWNER },
  73         { "null",                       0, '0' },
  74         { "numeric-uid-gid",            0, 'n' },
  75         { "owner",                      1, 'R' },
  76         { "pass-through",               0, 'p' },
  77         { "preserve-modification-time", 0, 'm' },
  78         { "quiet",                      0, OPTION_QUIET },
  79         { "unconditional",              0, 'u' },
  80         { "verbose",                    0, 'v' },
  81         { "version",                    0, OPTION_VERSION },
  82         { NULL, 0, 0 }
  83 };
  84
  85 /*
  86  * I used to try to select platform-provided getopt() or
  87  * getopt_long(), but that caused a lot of headaches.  In particular,
  88  * I couldn't consistently use long options in the test harness
  89  * because not all platforms have getopt_long().  That in turn led to
  90  * overuse of the -W hack in the test harness, which made it rough to
  91  * run the test harness against GNU cpio.  (I periodically run the
  92  * test harness here against GNU cpio as a sanity-check.  Yes,
  93  * I've found a couple of bugs in GNU cpio that way.)
  94  */
  95 int
  96 cpio_getopt(struct cpio *cpio)
  97 {
  98         enum { state_start = 0, state_next_word, state_short, state_long };
  99         static int state = state_start;
 100         static char *opt_word;
 101
 102         const struct option *popt, *match = NULL, *match2 = NULL;
 103         const char *p, *long_prefix = "--";
 104         size_t optlength;
 105         int opt = '?';
 106         int required = 0;
 107
 108         cpio->optarg = NULL;
 109
 110         /* First time through, initialize everything. */
 111         if (state == state_start) {
 112                 /* Skip program name. */
 113                 ++cpio->argv;
 114                 --cpio->argc;
 115                 state = state_next_word;
 116         }
 117
 118         /*
 119          * We're ready to look at the next word in argv.
 120          */
 121         if (state == state_next_word) {
 122                 /* No more arguments, so no more options. */
 123                 if (cpio->argv[0] == NULL)
 124                         return (-1);
 125                 /* Doesn't start with '-', so no more options. */
 126                 if (cpio->argv[0][0] != '-')
 127                         return (-1);
 128                 /* "--" marks end of options; consume it and return. */
 129                 if (strcmp(cpio->argv[0], "--") == 0) {
 130                         ++cpio->argv;
 131                         --cpio->argc;
 132                         return (-1);
 133                 }
 134                 /* Get next word for parsing. */
 135                 opt_word = *cpio->argv++;
 136                 --cpio->argc;
 137                 if (opt_word[1] == '-') {
 138                         /* Set up long option parser. */
 139                         state = state_long;
 140                         opt_word += 2; /* Skip leading '--' */
 141                 } else {
 142                         /* Set up short option parser. */
 143                         state = state_short;
 144                         ++opt_word;  /* Skip leading '-' */
 145                 }
 146         }
 147
 148         /*
 149          * We're parsing a group of POSIX-style single-character options.
 150          */
 151         if (state == state_short) {
 152                 /* Peel next option off of a group of short options. */
 153                 opt = *opt_word++;
 154                 if (opt == '\0') {
 155                         /* End of this group; recurse to get next option. */
 156                         state = state_next_word;
 157                         return cpio_getopt(cpio);
 158                 }
 159
 160                 /* Does this option take an argument? */
 161                 p = strchr(short_options, opt);
 162                 if (p == NULL)
 163                         return ('?');
 164                 if (p[1] == ':')
 165                         required = 1;
 166
 167                 /* If it takes an argument, parse that. */
 168                 if (required) {
 169                         /* If arg is run-in, opt_word already points to it. */
 170                         if (opt_word[0] == '\0') {
 171                                 /* Otherwise, pick up the next word. */
 172                                 opt_word = *cpio->argv;
 173                                 if (opt_word == NULL) {
 174                                         cpio_warnc(0,
 175                                             "Option -%c requires an argument",
 176                                             opt);
 177                                         return ('?');
 178                                 }
 179                                 ++cpio->argv;
 180                                 --cpio->argc;
 181                         }
 182                         if (opt == 'W') {
 183                                 state = state_long;
 184                                 long_prefix = "-W "; /* For clearer errors. */
 185                         } else {
 186                                 state = state_next_word;
 187                                 cpio->optarg = opt_word;
 188                         }
 189                 }
 190         }
 191
 192         /* We're reading a long option, including -W long=arg convention. */
 193         if (state == state_long) {
 194                 /* After this long option, we'll be starting a new word. */
 195                 state = state_next_word;
 196
 197                 /* Option name ends at '=' if there is one. */
 198                 p = strchr(opt_word, '=');
 199                 if (p != NULL) {
 200                         optlength = (size_t)(p - opt_word);
 201                         cpio->optarg = (char *)(uintptr_t)(p + 1);
 202                 } else {
 203                         optlength = strlen(opt_word);
 204                 }
 205
 206                 /* Search the table for an unambiguous match. */
 207                 for (popt = cpio_longopts; popt->name != NULL; popt++) {
 208                         /* Short-circuit if first chars don't match. */
 209                         if (popt->name[0] != opt_word[0])
 210                                 continue;
 211                         /* If option is a prefix of name in table, record it.*/
 212                         if (strncmp(opt_word, popt->name, optlength) == 0) {
 213                                 match2 = match; /* Record up to two matches. */
 214                                 match = popt;
 215                                 /* If it's an exact match, we're done. */
 216                                 if (strlen(popt->name) == optlength) {
 217                                         match2 = NULL; /* Forget the others. */
 218                                         break;
 219                                 }
 220                         }
 221                 }
 222
 223                 /* Fail if there wasn't a unique match. */
 224                 if (match == NULL) {
 225                         cpio_warnc(0,
 226                             "Option %s%s is not supported",
 227                             long_prefix, opt_word);
 228                         return ('?');
 229                 }
 230                 if (match2 != NULL) {
 231                         cpio_warnc(0,
 232                             "Ambiguous option %s%s (matches --%s and --%s)",
 233                             long_prefix, opt_word, match->name, match2->name);
 234                         return ('?');
 235                 }
 236
 237                 /* We've found a unique match; does it need an argument? */
 238                 if (match->required) {
 239                         /* Argument required: get next word if necessary. */
 240                         if (cpio->optarg == NULL) {
 241                                 cpio->optarg = *cpio->argv;
 242                                 if (cpio->optarg == NULL) {
 243                                         cpio_warnc(0,
 244                                             "Option %s%s requires an argument",
 245                                             long_prefix, match->name);
 246                                         return ('?');
 247                                 }
 248                                 ++cpio->argv;
 249                                 --cpio->argc;
 250                         }
 251                 } else {
 252                         /* Argument forbidden: fail if there is one. */
 253                         if (cpio->optarg != NULL) {
 254                                 cpio_warnc(0,
 255                                     "Option %s%s does not allow an argument",
 256                                     long_prefix, match->name);
 257                                 return ('?');
 258                         }
 259                 }
 260                 return (match->equivalent);
 261         }
 262
 263         return (opt);
 264 }
 265
 266
 267 /*
 268  * Parse the argument to the -R or --owner flag.
 269  *
 270  * The format is one of the following:
 271  *   <user>    - Override user but not group
 272  *   <user>:   - Override both, group is user's default group
 273  *   <user>:<group> - Override both
 274  *   :<group>  - Override group but not user
 275  *
 276  * A period can be used instead of the colon.
 277  *
 278  * Sets uid/gid as appropriate, -1 indicates uid/gid not specified.
 279  *
 280  */
 281 int
 282 owner_parse(const char *spec, int *uid, int *gid)
 283 {
 284         const char *u, *ue, *g;
 285
 286         *uid = -1;
 287         *gid = -1;
 288
 289         /*
 290          * Split spec into [user][:.][group]
 291          *  u -> first char of username, NULL if no username
 292          *  ue -> first char after username (colon, period, or \0)
 293          *  g -> first char of group name
 294          */
 295         if (*spec == ':' || *spec == '.') {
 296                 /* If spec starts with ':' or '.', then just group. */
 297                 ue = u = NULL;
 298                 g = spec + 1;
 299         } else {
 300                 /* Otherwise, [user] or [user][:] or [user][:][group] */
 301                 ue = u = spec;
 302                 while (*ue != ':' && *ue != '.' && *ue != '\0')
 303                         ++ue;
 304                 g = ue;
 305                 if (*g != '\0') /* Skip : or . to find first char of group. */
 306                         ++g;
 307         }
 308
 309         if (u != NULL) {
 310                 /* Look up user: ue is first char after end of user. */
 311                 char *user;
 312                 struct passwd *pwent;
 313
 314                 user = (char *)malloc(ue - u + 1);
 315                 if (user == NULL) {
 316                         cpio_warnc(errno, "Couldn't allocate memory");
 317                         return (1);
 318                 }
 319                 memcpy(user, u, ue - u);
 320                 user[ue - u] = '\0';
 321                 pwent = getpwnam(user);
 322                 if (pwent == NULL) {
 323                         cpio_warnc(errno, "Couldn't lookup user ``%s''", user);
 324                         return (1);
 325                 }
 326                 free(user);
 327                 *uid = pwent->pw_uid;
 328                 if (*ue != '\0' && *g == '\0')
 329                         *gid = pwent->pw_gid;
 330         }
 331         if (*g != '\0') {
 332                 struct group *grp;
 333                 grp = getgrnam(g);
 334                 if (grp != NULL)
 335                         *gid = grp->gr_gid;
 336                 else {
 337                         cpio_warnc(errno, "Couldn't look up group ``%s''", g);
 338                         return (1);
 339                 }
 340         }
 341         return (0);
 342 }