external/bsd/libarchive/dist/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 #include "err.h"
  50
  51 /*
  52  * Short options for cpio.  Please keep this sorted.
  53  */
  54 static const char *short_options = "0AaBC:cdE:F:f:H:hI:iJjLlmnO:opR:rtuvW:yZz";
  55
  56 /*
  57  * Long options for cpio.  Please keep this sorted.
  58  */
  59 static const struct option {
  60         const char *name;
  61         int required;   /* 1 if this option requires an argument */
  62         int equivalent; /* Equivalent short option. */
  63 } cpio_longopts[] = {
  64         { "create",                     0, 'o' },
  65         { "extract",                    0, 'i' },
  66         { "file",                       1, 'F' },
  67         { "format",                     1, 'H' },
  68         { "help",                       0, 'h' },
  69         { "insecure",                   0, OPTION_INSECURE },
  70         { "link",                       0, 'l' },
  71         { "list",                       0, 't' },
  72         { "lzma",                       0, OPTION_LZMA },
  73         { "make-directories",           0, 'd' },
  74         { "no-preserve-owner",          0, OPTION_NO_PRESERVE_OWNER },
  75         { "null",                       0, '0' },
  76         { "numeric-uid-gid",            0, 'n' },
  77         { "owner",                      1, 'R' },
  78         { "pass-through",               0, 'p' },
  79         { "preserve-modification-time", 0, 'm' },
  80         { "preserve-owner",             0, OPTION_PRESERVE_OWNER },
  81         { "quiet",                      0, OPTION_QUIET },
  82         { "unconditional",              0, 'u' },
  83         { "verbose",                    0, 'v' },
  84         { "version",                    0, OPTION_VERSION },
  85         { "xz",                         0, 'J' },
  86         { NULL, 0, 0 }
  87 };
  88
  89 /*
  90  * I used to try to select platform-provided getopt() or
  91  * getopt_long(), but that caused a lot of headaches.  In particular,
  92  * I couldn't consistently use long options in the test harness
  93  * because not all platforms have getopt_long().  That in turn led to
  94  * overuse of the -W hack in the test harness, which made it rough to
  95  * run the test harness against GNU cpio.  (I periodically run the
  96  * test harness here against GNU cpio as a sanity-check.  Yes,
  97  * I've found a couple of bugs in GNU cpio that way.)
  98  */
  99 int
 100 cpio_getopt(struct cpio *cpio)
 101 {
 102         enum { state_start = 0, state_next_word, state_short, state_long };
 103         static int state = state_start;
 104         static char *opt_word;
 105
 106         const struct option *popt, *match = NULL, *match2 = NULL;
 107         const char *p, *long_prefix = "--";
 108         size_t optlength;
 109         int opt = '?';
 110         int required = 0;
 111
 112         cpio->optarg = NULL;
 113
 114         /* First time through, initialize everything. */
 115         if (state == state_start) {
 116                 /* Skip program name. */
 117                 ++cpio->argv;
 118                 --cpio->argc;
 119                 state = state_next_word;
 120         }
 121
 122         /*
 123          * We're ready to look at the next word in argv.
 124          */
 125         if (state == state_next_word) {
 126                 /* No more arguments, so no more options. */
 127                 if (cpio->argv[0] == NULL)
 128                         return (-1);
 129                 /* Doesn't start with '-', so no more options. */
 130                 if (cpio->argv[0][0] != '-')
 131                         return (-1);
 132                 /* "--" marks end of options; consume it and return. */
 133                 if (strcmp(cpio->argv[0], "--") == 0) {
 134                         ++cpio->argv;
 135                         --cpio->argc;
 136                         return (-1);
 137                 }
 138                 /* Get next word for parsing. */
 139                 opt_word = *cpio->argv++;
 140                 --cpio->argc;
 141                 if (opt_word[1] == '-') {
 142                         /* Set up long option parser. */
 143                         state = state_long;
 144                         opt_word += 2; /* Skip leading '--' */
 145                 } else {
 146                         /* Set up short option parser. */
 147                         state = state_short;
 148                         ++opt_word;  /* Skip leading '-' */
 149                 }
 150         }
 151
 152         /*
 153          * We're parsing a group of POSIX-style single-character options.
 154          */
 155         if (state == state_short) {
 156                 /* Peel next option off of a group of short options. */
 157                 opt = *opt_word++;
 158                 if (opt == '\0') {
 159                         /* End of this group; recurse to get next option. */
 160                         state = state_next_word;
 161                         return cpio_getopt(cpio);
 162                 }
 163
 164                 /* Does this option take an argument? */
 165                 p = strchr(short_options, opt);
 166                 if (p == NULL)
 167                         return ('?');
 168                 if (p[1] == ':')
 169                         required = 1;
 170
 171                 /* If it takes an argument, parse that. */
 172                 if (required) {
 173                         /* If arg is run-in, opt_word already points to it. */
 174                         if (opt_word[0] == '\0') {
 175                                 /* Otherwise, pick up the next word. */
 176                                 opt_word = *cpio->argv;
 177                                 if (opt_word == NULL) {
 178                                         lafe_warnc(0,
 179                                             "Option -%c requires an argument",
 180                                             opt);
 181                                         return ('?');
 182                                 }
 183                                 ++cpio->argv;
 184                                 --cpio->argc;
 185                         }
 186                         if (opt == 'W') {
 187                                 state = state_long;
 188                                 long_prefix = "-W "; /* For clearer errors. */
 189                         } else {
 190                                 state = state_next_word;
 191                                 cpio->optarg = opt_word;
 192                         }
 193                 }
 194         }
 195
 196         /* We're reading a long option, including -W long=arg convention. */
 197         if (state == state_long) {
 198                 /* After this long option, we'll be starting a new word. */
 199                 state = state_next_word;
 200
 201                 /* Option name ends at '=' if there is one. */
 202                 p = strchr(opt_word, '=');
 203                 if (p != NULL) {
 204                         optlength = (size_t)(p - opt_word);
 205                         cpio->optarg = (char *)(uintptr_t)(p + 1);
 206                 } else {
 207                         optlength = strlen(opt_word);
 208                 }
 209
 210                 /* Search the table for an unambiguous match. */
 211                 for (popt = cpio_longopts; popt->name != NULL; popt++) {
 212                         /* Short-circuit if first chars don't match. */
 213                         if (popt->name[0] != opt_word[0])
 214                                 continue;
 215                         /* If option is a prefix of name in table, record it.*/
 216                         if (strncmp(opt_word, popt->name, optlength) == 0) {
 217                                 match2 = match; /* Record up to two matches. */
 218                                 match = popt;
 219                                 /* If it's an exact match, we're done. */
 220                                 if (strlen(popt->name) == optlength) {
 221                                         match2 = NULL; /* Forget the others. */
 222                                         break;
 223                                 }
 224                         }
 225                 }
 226
 227                 /* Fail if there wasn't a unique match. */
 228                 if (match == NULL) {
 229                         lafe_warnc(0,
 230                             "Option %s%s is not supported",
 231                             long_prefix, opt_word);
 232                         return ('?');
 233                 }
 234                 if (match2 != NULL) {
 235                         lafe_warnc(0,
 236                             "Ambiguous option %s%s (matches --%s and --%s)",
 237                             long_prefix, opt_word, match->name, match2->name);
 238                         return ('?');
 239                 }
 240
 241                 /* We've found a unique match; does it need an argument? */
 242                 if (match->required) {
 243                         /* Argument required: get next word if necessary. */
 244                         if (cpio->optarg == NULL) {
 245                                 cpio->optarg = *cpio->argv;
 246                                 if (cpio->optarg == NULL) {
 247                                         lafe_warnc(0,
 248                                             "Option %s%s requires an argument",
 249                                             long_prefix, match->name);
 250                                         return ('?');
 251                                 }
 252                                 ++cpio->argv;
 253                                 --cpio->argc;
 254                         }
 255                 } else {
 256                         /* Argument forbidden: fail if there is one. */
 257                         if (cpio->optarg != NULL) {
 258                                 lafe_warnc(0,
 259                                     "Option %s%s does not allow an argument",
 260                                     long_prefix, match->name);
 261                                 return ('?');
 262                         }
 263                 }
 264                 return (match->equivalent);
 265         }
 266
 267         return (opt);
 268 }
 269
 270
 271 /*
 272  * Parse the argument to the -R or --owner flag.
 273  *
 274  * The format is one of the following:
 275  *   <username|uid>    - Override user but not group
 276  *   <username>:   - Override both, group is user's default group
 277  *   <uid>:    - Override user but not group
 278  *   <username|uid>:<groupname|gid> - Override both
 279  *   :<groupname|gid>  - Override group but not user
 280  *
 281  * Where uid/gid are decimal representations and groupname/username
 282  * are names to be looked up in system database.  Note that we try
 283  * to look up an argument as a name first, then try numeric parsing.
 284  *
 285  * A period can be used instead of the colon.
 286  *
 287  * Sets uid/gid return as appropriate, -1 indicates uid/gid not specified.
 288  *
 289  * Returns NULL if no error, otherwise returns error string for display.
 290  *
 291  */
 292 const char *
 293 owner_parse(const char *spec, int *uid, int *gid)
 294 {
 295         static char errbuff[128];
 296         const char *u, *ue, *g;
 297
 298         *uid = -1;
 299         *gid = -1;
 300
 301         if (spec[0] == '\0')
 302                 return ("Invalid empty user/group spec");
 303
 304         /*
 305          * Split spec into [user][:.][group]
 306          *  u -> first char of username, NULL if no username
 307          *  ue -> first char after username (colon, period, or \0)
 308          *  g -> first char of group name
 309          */
 310         if (*spec == ':' || *spec == '.') {
 311                 /* If spec starts with ':' or '.', then just group. */
 312                 ue = u = NULL;
 313                 g = spec + 1;
 314         } else {
 315                 /* Otherwise, [user] or [user][:] or [user][:][group] */
 316                 ue = u = spec;
 317                 while (*ue != ':' && *ue != '.' && *ue != '\0')
 318                         ++ue;
 319                 g = ue;
 320                 if (*g != '\0') /* Skip : or . to find first char of group. */
 321                         ++g;
 322         }
 323
 324         if (u != NULL) {
 325                 /* Look up user: ue is first char after end of user. */
 326                 char *user;
 327                 struct passwd *pwent;
 328
 329                 user = (char *)malloc(ue - u + 1);
 330                 if (user == NULL)
 331                         return ("Couldn't allocate memory");
 332                 memcpy(user, u, ue - u);
 333                 user[ue - u] = '\0';
 334                 if ((pwent = getpwnam(user)) != NULL) {
 335                         *uid = pwent->pw_uid;
 336                         if (*ue != '\0')
 337                                 *gid = pwent->pw_gid;
 338                 } else {
 339                         char *end;
 340                         errno = 0;
 341                         *uid = strtoul(user, &end, 10);
 342                         if (errno || *end != '\0') {
 343                                 snprintf(errbuff, sizeof(errbuff),
 344                                     "Couldn't lookup user ``%s''", user);
 345                                 errbuff[sizeof(errbuff) - 1] = '\0';
 346                                 return (errbuff);
 347                         }
 348                 }
 349                 free(user);
 350         }
 351
 352         if (*g != '\0') {
 353                 struct group *grp;
 354                 if ((grp = getgrnam(g)) != NULL) {
 355                         *gid = grp->gr_gid;
 356                 } else {
 357                         char *end;
 358                         errno = 0;
 359                         *gid = strtoul(g, &end, 10);
 360                         if (errno || *end != '\0') {
 361                                 snprintf(errbuff, sizeof(errbuff),
 362                                     "Couldn't lookup group ``%s''", g);
 363                                 errbuff[sizeof(errbuff) - 1] = '\0';
 364                                 return (errbuff);
 365                         }
 366                 }
 367         }
 368         return (NULL);
 369 }