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Diffstat (limited to 'contrib/libarchive/cpio/cmdline.c')
| -rw-r--r-- | contrib/libarchive/cpio/cmdline.c | 369 |
1 files changed, 369 insertions, 0 deletions
diff --git a/contrib/libarchive/cpio/cmdline.c b/contrib/libarchive/cpio/cmdline.c new file mode 100644 index 0000000..2223798 --- /dev/null +++ b/contrib/libarchive/cpio/cmdline.c @@ -0,0 +1,369 @@ +/*- + * Copyright (c) 2003-2007 Tim Kientzle + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer + * in this position and unchanged. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + + +#include "cpio_platform.h" +__FBSDID("$FreeBSD: src/usr.bin/cpio/cmdline.c,v 1.5 2008/12/06 07:30:40 kientzle Exp $"); + +#ifdef HAVE_ERRNO_H +#include <errno.h> +#endif +#ifdef HAVE_GRP_H +#include <grp.h> +#endif +#ifdef HAVE_PWD_H +#include <pwd.h> +#endif +#include <stdio.h> +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif +#ifdef HAVE_STRING_H +#include <string.h> +#endif + +#include "cpio.h" +#include "err.h" + +/* + * Short options for cpio. Please keep this sorted. + */ +static const char *short_options = "0AaBC:cdE:F:f:H:hI:iJjLlmnO:opR:rtuvW:yZz"; + +/* + * Long options for cpio. Please keep this sorted. + */ +static const struct option { + const char *name; + int required; /* 1 if this option requires an argument */ + int equivalent; /* Equivalent short option. */ +} cpio_longopts[] = { + { "create", 0, 'o' }, + { "extract", 0, 'i' }, + { "file", 1, 'F' }, + { "format", 1, 'H' }, + { "help", 0, 'h' }, + { "insecure", 0, OPTION_INSECURE }, + { "link", 0, 'l' }, + { "list", 0, 't' }, + { "lzma", 0, OPTION_LZMA }, + { "make-directories", 0, 'd' }, + { "no-preserve-owner", 0, OPTION_NO_PRESERVE_OWNER }, + { "null", 0, '0' }, + { "numeric-uid-gid", 0, 'n' }, + { "owner", 1, 'R' }, + { "pass-through", 0, 'p' }, + { "preserve-modification-time", 0, 'm' }, + { "preserve-owner", 0, OPTION_PRESERVE_OWNER }, + { "quiet", 0, OPTION_QUIET }, + { "unconditional", 0, 'u' }, + { "verbose", 0, 'v' }, + { "version", 0, OPTION_VERSION }, + { "xz", 0, 'J' }, + { NULL, 0, 0 } +}; + +/* + * I used to try to select platform-provided getopt() or + * getopt_long(), but that caused a lot of headaches. In particular, + * I couldn't consistently use long options in the test harness + * because not all platforms have getopt_long(). That in turn led to + * overuse of the -W hack in the test harness, which made it rough to + * run the test harness against GNU cpio. (I periodically run the + * test harness here against GNU cpio as a sanity-check. Yes, + * I've found a couple of bugs in GNU cpio that way.) + */ +int +cpio_getopt(struct cpio *cpio) +{ + enum { state_start = 0, state_next_word, state_short, state_long }; + static int state = state_start; + static char *opt_word; + + const struct option *popt, *match = NULL, *match2 = NULL; + const char *p, *long_prefix = "--"; + size_t optlength; + int opt = '?'; + int required = 0; + + cpio->optarg = NULL; + + /* First time through, initialize everything. */ + if (state == state_start) { + /* Skip program name. */ + ++cpio->argv; + --cpio->argc; + state = state_next_word; + } + + /* + * We're ready to look at the next word in argv. + */ + if (state == state_next_word) { + /* No more arguments, so no more options. */ + if (cpio->argv[0] == NULL) + return (-1); + /* Doesn't start with '-', so no more options. */ + if (cpio->argv[0][0] != '-') + return (-1); + /* "--" marks end of options; consume it and return. */ + if (strcmp(cpio->argv[0], "--") == 0) { + ++cpio->argv; + --cpio->argc; + return (-1); + } + /* Get next word for parsing. */ + opt_word = *cpio->argv++; + --cpio->argc; + if (opt_word[1] == '-') { + /* Set up long option parser. */ + state = state_long; + opt_word += 2; /* Skip leading '--' */ + } else { + /* Set up short option parser. */ + state = state_short; + ++opt_word; /* Skip leading '-' */ + } + } + + /* + * We're parsing a group of POSIX-style single-character options. + */ + if (state == state_short) { + /* Peel next option off of a group of short options. */ + opt = *opt_word++; + if (opt == '\0') { + /* End of this group; recurse to get next option. */ + state = state_next_word; + return cpio_getopt(cpio); + } + + /* Does this option take an argument? */ + p = strchr(short_options, opt); + if (p == NULL) + return ('?'); + if (p[1] == ':') + required = 1; + + /* If it takes an argument, parse that. */ + if (required) { + /* If arg is run-in, opt_word already points to it. */ + if (opt_word[0] == '\0') { + /* Otherwise, pick up the next word. */ + opt_word = *cpio->argv; + if (opt_word == NULL) { + lafe_warnc(0, + "Option -%c requires an argument", + opt); + return ('?'); + } + ++cpio->argv; + --cpio->argc; + } + if (opt == 'W') { + state = state_long; + long_prefix = "-W "; /* For clearer errors. */ + } else { + state = state_next_word; + cpio->optarg = opt_word; + } + } + } + + /* We're reading a long option, including -W long=arg convention. */ + if (state == state_long) { + /* After this long option, we'll be starting a new word. */ + state = state_next_word; + + /* Option name ends at '=' if there is one. */ + p = strchr(opt_word, '='); + if (p != NULL) { + optlength = (size_t)(p - opt_word); + cpio->optarg = (char *)(uintptr_t)(p + 1); + } else { + optlength = strlen(opt_word); + } + + /* Search the table for an unambiguous match. */ + for (popt = cpio_longopts; popt->name != NULL; popt++) { + /* Short-circuit if first chars don't match. */ + if (popt->name[0] != opt_word[0]) + continue; + /* If option is a prefix of name in table, record it.*/ + if (strncmp(opt_word, popt->name, optlength) == 0) { + match2 = match; /* Record up to two matches. */ + match = popt; + /* If it's an exact match, we're done. */ + if (strlen(popt->name) == optlength) { + match2 = NULL; /* Forget the others. */ + break; + } + } + } + + /* Fail if there wasn't a unique match. */ + if (match == NULL) { + lafe_warnc(0, + "Option %s%s is not supported", + long_prefix, opt_word); + return ('?'); + } + if (match2 != NULL) { + lafe_warnc(0, + "Ambiguous option %s%s (matches --%s and --%s)", + long_prefix, opt_word, match->name, match2->name); + return ('?'); + } + + /* We've found a unique match; does it need an argument? */ + if (match->required) { + /* Argument required: get next word if necessary. */ + if (cpio->optarg == NULL) { + cpio->optarg = *cpio->argv; + if (cpio->optarg == NULL) { + lafe_warnc(0, + "Option %s%s requires an argument", + long_prefix, match->name); + return ('?'); + } + ++cpio->argv; + --cpio->argc; + } + } else { + /* Argument forbidden: fail if there is one. */ + if (cpio->optarg != NULL) { + lafe_warnc(0, + "Option %s%s does not allow an argument", + long_prefix, match->name); + return ('?'); + } + } + return (match->equivalent); + } + + return (opt); +} + + +/* + * Parse the argument to the -R or --owner flag. + * + * The format is one of the following: + * <username|uid> - Override user but not group + * <username>: - Override both, group is user's default group + * <uid>: - Override user but not group + * <username|uid>:<groupname|gid> - Override both + * :<groupname|gid> - Override group but not user + * + * Where uid/gid are decimal representations and groupname/username + * are names to be looked up in system database. Note that we try + * to look up an argument as a name first, then try numeric parsing. + * + * A period can be used instead of the colon. + * + * Sets uid/gid return as appropriate, -1 indicates uid/gid not specified. + * + * Returns NULL if no error, otherwise returns error string for display. + * + */ +const char * +owner_parse(const char *spec, int *uid, int *gid) +{ + static char errbuff[128]; + const char *u, *ue, *g; + + *uid = -1; + *gid = -1; + + if (spec[0] == '\0') + return ("Invalid empty user/group spec"); + + /* + * Split spec into [user][:.][group] + * u -> first char of username, NULL if no username + * ue -> first char after username (colon, period, or \0) + * g -> first char of group name + */ + if (*spec == ':' || *spec == '.') { + /* If spec starts with ':' or '.', then just group. */ + ue = u = NULL; + g = spec + 1; + } else { + /* Otherwise, [user] or [user][:] or [user][:][group] */ + ue = u = spec; + while (*ue != ':' && *ue != '.' && *ue != '\0') + ++ue; + g = ue; + if (*g != '\0') /* Skip : or . to find first char of group. */ + ++g; + } + + if (u != NULL) { + /* Look up user: ue is first char after end of user. */ + char *user; + struct passwd *pwent; + + user = (char *)malloc(ue - u + 1); + if (user == NULL) + return ("Couldn't allocate memory"); + memcpy(user, u, ue - u); + user[ue - u] = '\0'; + if ((pwent = getpwnam(user)) != NULL) { + *uid = pwent->pw_uid; + if (*ue != '\0') + *gid = pwent->pw_gid; + } else { + char *end; + errno = 0; + *uid = strtoul(user, &end, 10); + if (errno || *end != '\0') { + snprintf(errbuff, sizeof(errbuff), + "Couldn't lookup user ``%s''", user); + errbuff[sizeof(errbuff) - 1] = '\0'; + return (errbuff); + } + } + free(user); + } + + if (*g != '\0') { + struct group *grp; + if ((grp = getgrnam(g)) != NULL) { + *gid = grp->gr_gid; + } else { + char *end; + errno = 0; + *gid = strtoul(g, &end, 10); + if (errno || *end != '\0') { + snprintf(errbuff, sizeof(errbuff), + "Couldn't lookup group ``%s''", g); + errbuff[sizeof(errbuff) - 1] = '\0'; + return (errbuff); + } + } + } + return (NULL); +} |
