277 lines
8.1 KiB
C
277 lines
8.1 KiB
C
/*-
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* Copyright (c) 2003-2007 Tim Kientzle
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _XOPEN_SOURCE
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# define _XOPEN_SOURCE 500 /* getpwuid_r and getgrgid_r signatures */
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#endif
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#ifdef HAVE_GRP_H
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#include <grp.h>
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#endif
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#ifdef HAVE_PWD_H
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#include <pwd.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include "archive.h"
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#if defined(_WIN32) && !defined(__CYGWIN__)
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int
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archive_read_disk_set_standard_lookup(struct archive *a)
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{
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archive_set_error(a, -1, "Standard lookups not available on Windows");
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return (ARCHIVE_FATAL);
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}
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#else /* ! (_WIN32 && !__CYGWIN__) */
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#define name_cache_size 127
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static const char * const NO_NAME = "(noname)";
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struct name_cache {
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struct archive *archive;
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char *buff;
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size_t buff_size;
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int probes;
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int hits;
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size_t size;
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struct {
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id_t id;
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const char *name;
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} cache[name_cache_size];
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};
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static const char * lookup_gname(void *, gid_t);
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static const char * lookup_uname(void *, uid_t);
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static void cleanup(void *);
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static const char * lookup_gname_helper(struct name_cache *, id_t gid);
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static const char * lookup_uname_helper(struct name_cache *, id_t uid);
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/*
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* Installs functions that use getpwuid()/getgrgid()---along with
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* a simple cache to accelerate such lookups---into the archive_read_disk
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* object. This is in a separate file because getpwuid()/getgrgid()
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* can pull in a LOT of library code (including NIS/LDAP functions, which
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* pull in DNS resolveers, etc). This can easily top 500kB, which makes
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* it inappropriate for some space-constrained applications.
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*
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* Applications that are size-sensitive may want to just use the
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* real default functions (defined in archive_read_disk.c) that just
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* use the uid/gid without the lookup. Or define your own custom functions
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* if you prefer.
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*/
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int
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archive_read_disk_set_standard_lookup(struct archive *a)
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{
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struct name_cache *ucache = malloc(sizeof(struct name_cache));
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struct name_cache *gcache = malloc(sizeof(struct name_cache));
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if (ucache == NULL || gcache == NULL) {
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archive_set_error(a, ENOMEM,
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"Can't allocate uname/gname lookup cache");
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free(ucache);
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free(gcache);
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return (ARCHIVE_FATAL);
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}
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memset(ucache, 0, sizeof(*ucache));
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ucache->archive = a;
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ucache->size = name_cache_size;
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memset(gcache, 0, sizeof(*gcache));
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gcache->archive = a;
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gcache->size = name_cache_size;
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archive_read_disk_set_gname_lookup(a, gcache, lookup_gname, cleanup);
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archive_read_disk_set_uname_lookup(a, ucache, lookup_uname, cleanup);
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return (ARCHIVE_OK);
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}
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static void
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cleanup(void *data)
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{
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struct name_cache *cache = (struct name_cache *)data;
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size_t i;
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if (cache != NULL) {
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for (i = 0; i < cache->size; i++) {
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if (cache->cache[i].name != NULL &&
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cache->cache[i].name != NO_NAME)
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free((void *)(uintptr_t)cache->cache[i].name);
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}
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free(cache->buff);
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free(cache);
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}
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}
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/*
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* Lookup uid/gid from uname/gname, return NULL if no match.
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*/
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static const char *
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lookup_name(struct name_cache *cache,
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const char * (*lookup_fn)(struct name_cache *, id_t), id_t id)
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{
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const char *name;
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int slot;
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cache->probes++;
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slot = id % cache->size;
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if (cache->cache[slot].name != NULL) {
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if (cache->cache[slot].id == id) {
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cache->hits++;
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if (cache->cache[slot].name == NO_NAME)
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return (NULL);
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return (cache->cache[slot].name);
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}
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if (cache->cache[slot].name != NO_NAME)
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free((void *)(uintptr_t)cache->cache[slot].name);
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cache->cache[slot].name = NULL;
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}
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name = (lookup_fn)(cache, id);
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if (name == NULL) {
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/* Cache and return the negative response. */
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cache->cache[slot].name = NO_NAME;
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cache->cache[slot].id = id;
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return (NULL);
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}
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cache->cache[slot].name = name;
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cache->cache[slot].id = id;
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return (cache->cache[slot].name);
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}
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static const char *
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lookup_uname(void *data, uid_t uid)
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{
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struct name_cache *uname_cache = (struct name_cache *)data;
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return (lookup_name(uname_cache,
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&lookup_uname_helper, (id_t)uid));
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}
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static const char *
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lookup_uname_helper(struct name_cache *cache, id_t id)
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{
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struct passwd pwent, *result;
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int r;
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if (cache->buff_size == 0) {
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cache->buff_size = 256;
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cache->buff = malloc(cache->buff_size);
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}
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if (cache->buff == NULL)
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return (NULL);
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for (;;) {
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result = &pwent; /* Old getpwuid_r ignores last argument. */
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r = getpwuid_r((uid_t)id, &pwent,
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cache->buff, cache->buff_size, &result);
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if (r == 0)
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break;
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if (r != ERANGE)
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break;
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/* ERANGE means our buffer was too small, but POSIX
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* doesn't tell us how big the buffer should be, so
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* we just double it and try again. Because the buffer
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* is kept around in the cache object, we shouldn't
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* have to do this very often. */
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cache->buff_size *= 2;
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cache->buff = realloc(cache->buff, cache->buff_size);
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if (cache->buff == NULL)
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break;
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}
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if (r != 0) {
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archive_set_error(cache->archive, errno,
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"Can't lookup user for id %d", (int)id);
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return (NULL);
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}
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if (result == NULL)
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return (NULL);
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return strdup(result->pw_name);
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}
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static const char *
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lookup_gname(void *data, gid_t gid)
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{
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struct name_cache *gname_cache = (struct name_cache *)data;
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return (lookup_name(gname_cache,
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&lookup_gname_helper, (id_t)gid));
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}
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static const char *
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lookup_gname_helper(struct name_cache *cache, id_t id)
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{
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struct group grent, *result;
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int r;
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if (cache->buff_size == 0) {
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cache->buff_size = 256;
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cache->buff = malloc(cache->buff_size);
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}
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if (cache->buff == NULL)
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return (NULL);
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for (;;) {
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result = &grent; /* Old getgrgid_r ignores last argument. */
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r = getgrgid_r((gid_t)id, &grent,
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cache->buff, cache->buff_size, &result);
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if (r == 0)
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break;
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if (r != ERANGE)
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break;
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/* ERANGE means our buffer was too small, but POSIX
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* doesn't tell us how big the buffer should be, so
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* we just double it and try again. */
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cache->buff_size *= 2;
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cache->buff = realloc(cache->buff, cache->buff_size);
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if (cache->buff == NULL)
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break;
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}
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if (r != 0) {
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archive_set_error(cache->archive, errno,
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"Can't lookup group for id %d", (int)id);
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return (NULL);
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}
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if (result == NULL)
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return (NULL);
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return strdup(result->gr_name);
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}
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#endif /* ! (_WIN32 && !__CYGWIN__) */
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