2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "cpio_platform.h"
29 __FBSDID("$FreeBSD$");
51 * Short options for cpio. Please keep this sorted.
53 static const char *short_options = "0AaBC:F:O:cdE:f:H:hijLlmnopR:rtuvVW:yZz";
56 * Long options for cpio. Please keep this sorted.
58 static const struct option {
60 int required; /* 1 if this option requires an argument */
61 int equivalent; /* Equivalent short option. */
65 { "extract", 0, 'i' },
69 { "insecure", 0, OPTION_INSECURE },
72 { "make-directories", 0, 'd' },
73 { "no-preserve-owner", 0, OPTION_NO_PRESERVE_OWNER },
75 { "numeric-uid-gid", 0, 'n' },
77 { "pass-through", 0, 'p' },
78 { "preserve-modification-time", 0, 'm' },
79 { "quiet", 0, OPTION_QUIET },
80 { "unconditional", 0, 'u' },
81 { "verbose", 0, 'v' },
82 { "version", 0, OPTION_VERSION },
87 * I used to try to select platform-provided getopt() or
88 * getopt_long(), but that caused a lot of headaches. In particular,
89 * I couldn't consistently use long options in the test harness
90 * because not all platforms have getopt_long(). That in turn led to
91 * overuse of the -W hack in the test harness, which made it rough to
92 * run the test harness against GNU cpio. (I periodically run the
93 * test harness here against GNU cpio as a sanity-check. Yes,
94 * I've found a couple of bugs in GNU cpio that way.)
97 cpio_getopt(struct cpio *cpio)
99 enum { state_start = 0, state_next_word, state_short, state_long };
100 static int state = state_start;
101 static char *opt_word;
103 const struct option *popt, *match = NULL, *match2 = NULL;
104 const char *p, *long_prefix = "--";
111 /* First time through, initialize everything. */
112 if (state == state_start) {
113 /* Skip program name. */
116 state = state_next_word;
120 * We're ready to look at the next word in argv.
122 if (state == state_next_word) {
123 /* No more arguments, so no more options. */
124 if (cpio->argv[0] == NULL)
126 /* Doesn't start with '-', so no more options. */
127 if (cpio->argv[0][0] != '-')
129 /* "--" marks end of options; consume it and return. */
130 if (strcmp(cpio->argv[0], "--") == 0) {
135 /* Get next word for parsing. */
136 opt_word = *cpio->argv++;
138 if (opt_word[1] == '-') {
139 /* Set up long option parser. */
141 opt_word += 2; /* Skip leading '--' */
143 /* Set up short option parser. */
145 ++opt_word; /* Skip leading '-' */
150 * We're parsing a group of POSIX-style single-character options.
152 if (state == state_short) {
153 /* Peel next option off of a group of short options. */
156 /* End of this group; recurse to get next option. */
157 state = state_next_word;
158 return cpio_getopt(cpio);
161 /* Does this option take an argument? */
162 p = strchr(short_options, opt);
168 /* If it takes an argument, parse that. */
170 /* If arg is run-in, opt_word already points to it. */
171 if (opt_word[0] == '\0') {
172 /* Otherwise, pick up the next word. */
173 opt_word = *cpio->argv;
174 if (opt_word == NULL) {
176 "Option -%c requires an argument",
185 long_prefix = "-W "; /* For clearer errors. */
187 state = state_next_word;
188 cpio->optarg = opt_word;
193 /* We're reading a long option, including -W long=arg convention. */
194 if (state == state_long) {
195 /* After this long option, we'll be starting a new word. */
196 state = state_next_word;
198 /* Option name ends at '=' if there is one. */
199 p = strchr(opt_word, '=');
201 optlength = (size_t)(p - opt_word);
202 cpio->optarg = (char *)(uintptr_t)(p + 1);
204 optlength = strlen(opt_word);
207 /* Search the table for an unambiguous match. */
208 for (popt = cpio_longopts; popt->name != NULL; popt++) {
209 /* Short-circuit if first chars don't match. */
210 if (popt->name[0] != opt_word[0])
212 /* If option is a prefix of name in table, record it.*/
213 if (strncmp(opt_word, popt->name, optlength) == 0) {
214 match2 = match; /* Record up to two matches. */
216 /* If it's an exact match, we're done. */
217 if (strlen(popt->name) == optlength) {
218 match2 = NULL; /* Forget the others. */
224 /* Fail if there wasn't a unique match. */
227 "Option %s%s is not supported",
228 long_prefix, opt_word);
231 if (match2 != NULL) {
233 "Ambiguous option %s%s (matches --%s and --%s)",
234 long_prefix, opt_word, match->name, match2->name);
238 /* We've found a unique match; does it need an argument? */
239 if (match->required) {
240 /* Argument required: get next word if necessary. */
241 if (cpio->optarg == NULL) {
242 cpio->optarg = *cpio->argv;
243 if (cpio->optarg == NULL) {
245 "Option %s%s requires an argument",
246 long_prefix, match->name);
253 /* Argument forbidden: fail if there is one. */
254 if (cpio->optarg != NULL) {
256 "Option %s%s does not allow an argument",
257 long_prefix, match->name);
261 return (match->equivalent);
269 * Parse the argument to the -R or --owner flag.
271 * The format is one of the following:
272 * <username|uid> - Override user but not group
273 * <username>: - Override both, group is user's default group
274 * <uid>: - Override user but not group
275 * <username|uid>:<groupname|gid> - Override both
276 * :<groupname|gid> - Override group but not user
278 * Where uid/gid are decimal representations and groupname/username
279 * are names to be looked up in system database. Note that we try
280 * to look up an argument as a name first, then try numeric parsing.
282 * A period can be used instead of the colon.
284 * Sets uid/gid return as appropriate, -1 indicates uid/gid not specified.
288 owner_parse(const char *spec, int *uid, int *gid)
290 const char *u, *ue, *g;
299 * Split spec into [user][:.][group]
300 * u -> first char of username, NULL if no username
301 * ue -> first char after username (colon, period, or \0)
302 * g -> first char of group name
304 if (*spec == ':' || *spec == '.') {
305 /* If spec starts with ':' or '.', then just group. */
309 /* Otherwise, [user] or [user][:] or [user][:][group] */
311 while (*ue != ':' && *ue != '.' && *ue != '\0')
314 if (*g != '\0') /* Skip : or . to find first char of group. */
319 /* Look up user: ue is first char after end of user. */
321 struct passwd *pwent;
323 user = (char *)malloc(ue - u + 1);
325 cpio_warnc(errno, "Couldn't allocate memory");
328 memcpy(user, u, ue - u);
330 if ((pwent = getpwnam(user)) != NULL) {
331 *uid = pwent->pw_uid;
333 *gid = pwent->pw_gid;
337 *uid = strtoul(user, &end, 10);
338 if (errno || *end != '\0') {
340 "Couldn't lookup user ``%s''", user);
349 if ((grp = getgrnam(g)) != NULL) {
354 *gid = strtoul(g, &end, 10);
355 if (errno || *end != '\0') {
357 "Couldn't lookup group ``%s''", g);