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:rtuvW: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. */
64 { "extract", 0, 'i' },
68 { "insecure", 0, OPTION_INSECURE },
71 { "make-directories", 0, 'd' },
72 { "no-preserve-owner", 0, OPTION_NO_PRESERVE_OWNER },
74 { "numeric-uid-gid", 0, 'n' },
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 },
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.)
96 cpio_getopt(struct cpio *cpio)
98 enum { state_start = 0, state_next_word, state_short, state_long };
99 static int state = state_start;
100 static char *opt_word;
102 const struct option *popt, *match = NULL, *match2 = NULL;
103 const char *p, *long_prefix = "--";
110 /* First time through, initialize everything. */
111 if (state == state_start) {
112 /* Skip program name. */
115 state = state_next_word;
119 * We're ready to look at the next word in argv.
121 if (state == state_next_word) {
122 /* No more arguments, so no more options. */
123 if (cpio->argv[0] == NULL)
125 /* Doesn't start with '-', so no more options. */
126 if (cpio->argv[0][0] != '-')
128 /* "--" marks end of options; consume it and return. */
129 if (strcmp(cpio->argv[0], "--") == 0) {
134 /* Get next word for parsing. */
135 opt_word = *cpio->argv++;
137 if (opt_word[1] == '-') {
138 /* Set up long option parser. */
140 opt_word += 2; /* Skip leading '--' */
142 /* Set up short option parser. */
144 ++opt_word; /* Skip leading '-' */
149 * We're parsing a group of POSIX-style single-character options.
151 if (state == state_short) {
152 /* Peel next option off of a group of short options. */
155 /* End of this group; recurse to get next option. */
156 state = state_next_word;
157 return cpio_getopt(cpio);
160 /* Does this option take an argument? */
161 p = strchr(short_options, opt);
167 /* If it takes an argument, parse that. */
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) {
175 "Option -%c requires an argument",
184 long_prefix = "-W "; /* For clearer errors. */
186 state = state_next_word;
187 cpio->optarg = opt_word;
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;
197 /* Option name ends at '=' if there is one. */
198 p = strchr(opt_word, '=');
200 optlength = (size_t)(p - opt_word);
201 cpio->optarg = (char *)(uintptr_t)(p + 1);
203 optlength = strlen(opt_word);
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])
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. */
215 /* If it's an exact match, we're done. */
216 if (strlen(popt->name) == optlength) {
217 match2 = NULL; /* Forget the others. */
223 /* Fail if there wasn't a unique match. */
226 "Option %s%s is not supported",
227 long_prefix, opt_word);
230 if (match2 != NULL) {
232 "Ambiguous option %s%s (matches --%s and --%s)",
233 long_prefix, opt_word, match->name, match2->name);
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) {
244 "Option %s%s requires an argument",
245 long_prefix, match->name);
252 /* Argument forbidden: fail if there is one. */
253 if (cpio->optarg != NULL) {
255 "Option %s%s does not allow an argument",
256 long_prefix, match->name);
260 return (match->equivalent);
268 * Parse the argument to the -R or --owner flag.
270 * The format is one of the following:
271 * <username|uid> - Override user but not group
272 * <username>: - Override both, group is user's default group
273 * <uid>: - Override user but not group
274 * <username|uid>:<groupname|gid> - Override both
275 * :<groupname|gid> - Override group but not user
277 * Where uid/gid are decimal representations and groupname/username
278 * are names to be looked up in system database. Note that we try
279 * to look up an argument as a name first, then try numeric parsing.
281 * A period can be used instead of the colon.
283 * Sets uid/gid return as appropriate, -1 indicates uid/gid not specified.
287 owner_parse(const char *spec, int *uid, int *gid)
289 const char *u, *ue, *g;
298 * Split spec into [user][:.][group]
299 * u -> first char of username, NULL if no username
300 * ue -> first char after username (colon, period, or \0)
301 * g -> first char of group name
303 if (*spec == ':' || *spec == '.') {
304 /* If spec starts with ':' or '.', then just group. */
308 /* Otherwise, [user] or [user][:] or [user][:][group] */
310 while (*ue != ':' && *ue != '.' && *ue != '\0')
313 if (*g != '\0') /* Skip : or . to find first char of group. */
318 /* Look up user: ue is first char after end of user. */
320 struct passwd *pwent;
322 user = (char *)malloc(ue - u + 1);
324 cpio_warnc(errno, "Couldn't allocate memory");
327 memcpy(user, u, ue - u);
329 if ((pwent = getpwnam(user)) != NULL) {
330 *uid = pwent->pw_uid;
332 *gid = pwent->pw_gid;
336 *uid = strtoul(user, &end, 10);
337 if (errno || *end != '\0') {
339 "Couldn't lookup user ``%s''", user);
348 if ((grp = getgrnam(g)) != NULL) {
353 *gid = strtoul(g, &end, 10);
354 if (errno || *end != '\0') {
356 "Couldn't lookup group ``%s''", g);