/*-
 * Copyright (c) 2003-2009 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.
 * 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 "archive_platform.h"
__FBSDID("$FreeBSD$");

#ifdef HAVE_SYS_TYPES_H
/* Mac OSX requires sys/types.h before sys/acl.h. */
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_ACL_H
#include <sys/acl.h>
#endif
#ifdef HAVE_SYS_EXTATTR_H
#include <sys/extattr.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_XATTR_H
#include <sys/xattr.h>
#endif
#ifdef HAVE_ACL_LIBACL_H
#include <acl/libacl.h>
#endif
#ifdef HAVE_ATTR_XATTR_H
#include <attr/xattr.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#endif

#include "archive.h"
#include "archive_entry.h"
#include "archive_private.h"
#include "archive_read_disk_private.h"

/*
 * Linux and FreeBSD plug this obvious hole in POSIX.1e in
 * different ways.
 */
#if HAVE_ACL_GET_PERM
#define ACL_GET_PERM acl_get_perm
#elif HAVE_ACL_GET_PERM_NP
#define ACL_GET_PERM acl_get_perm_np
#endif

static int setup_acls_posix1e(struct archive_read_disk *,
    struct archive_entry *, int fd);
static int setup_xattrs(struct archive_read_disk *,
    struct archive_entry *, int fd);

int
archive_read_disk_entry_from_file(struct archive *_a,
    struct archive_entry *entry,
    int fd, const struct stat *st)
{
    struct archive_read_disk *a = (struct archive_read_disk *)_a;
    const char *path, *name;
    struct stat s;
    int initial_fd = fd;
    int r, r1;

    archive_clear_error(_a);
    path = archive_entry_sourcepath(entry);
    if (path == NULL)
        path = archive_entry_pathname(entry);

#ifdef EXT2_IOC_GETFLAGS
    /* Linux requires an extra ioctl to pull the flags.  Although
     * this is an extra step, it has a nice side-effect: We get an
     * open file descriptor which we can use in the subsequent lookups. */
    if ((S_ISREG(st->st_mode) || S_ISDIR(st->st_mode))) {
        if (fd < 0)
            fd = open(pathname, O_RDONLY | O_NONBLOCK | O_BINARY);
        if (fd >= 0) {
            unsigned long stflags;
            int r = ioctl(fd, EXT2_IOC_GETFLAGS, &stflags);
            if (r == 0 && stflags != 0)
                archive_entry_set_fflags(entry, stflags, 0);
        }
    }
#endif

    if (st == NULL) {
        /* TODO: On Windows, use GetFileInfoByHandle() here.
         * Using Windows stat() call is badly broken, but
         * even the stat() wrapper has problems because
         * 'struct stat' is broken on Windows.
         */
#if HAVE_FSTAT
        if (fd >= 0) {
            if (fstat(fd, &s) != 0)
                return (ARCHIVE_FATAL);
        } else
#endif
#if HAVE_LSTAT
        if (!a->follow_symlinks) {
            if (lstat(path, &s) != 0)
                return (ARCHIVE_FATAL);
        } else
#endif
        if (stat(path, &s) != 0)
            return (ARCHIVE_FATAL);
        st = &s;
    }
    archive_entry_copy_stat(entry, st);

    /* Lookup uname/gname */
    name = archive_read_disk_uname(_a, archive_entry_uid(entry));
    if (name != NULL)
        archive_entry_copy_uname(entry, name);
    name = archive_read_disk_gname(_a, archive_entry_gid(entry));
    if (name != NULL)
        archive_entry_copy_gname(entry, name);

#ifdef HAVE_STRUCT_STAT_ST_FLAGS
    /* On FreeBSD, we get flags for free with the stat. */
    /* TODO: Does this belong in copy_stat()? */
    if (st->st_flags != 0)
        archive_entry_set_fflags(entry, st->st_flags, 0);
#endif

#ifdef HAVE_READLINK
    if (S_ISLNK(st->st_mode)) {
        char linkbuffer[PATH_MAX + 1];
        int lnklen = readlink(path, linkbuffer, PATH_MAX);
        if (lnklen < 0) {
            archive_set_error(&a->archive, errno,
                "Couldn't read link data");
            return (ARCHIVE_WARN);
        }
        linkbuffer[lnklen] = 0;
        archive_entry_set_symlink(entry, linkbuffer);
    }
#endif

    r = setup_acls_posix1e(a, entry, fd);
    r1 = setup_xattrs(a, entry, fd);
    if (r1 < r)
        r = r1;
    /* If we opened the file earlier in this function, close it. */
    if (initial_fd != fd)
        close(fd);
    return (r);
}

#ifdef HAVE_POSIX_ACL
static void setup_acl_posix1e(struct archive_read_disk *a,
    struct archive_entry *entry, acl_t acl, int archive_entry_acl_type);

static int
setup_acls_posix1e(struct archive_read_disk *a,
    struct archive_entry *entry, int fd)
{
    const char  *accpath;
    acl_t        acl;

    accpath = archive_entry_sourcepath(entry);
    if (accpath == NULL)
        accpath = archive_entry_pathname(entry);

    archive_entry_acl_clear(entry);

    /* Retrieve access ACL from file. */
    if (fd >= 0)
        acl = acl_get_fd(fd);
#if HAVE_ACL_GET_LINK_NP
    else if (!a->follow_symlinks)
        acl = acl_get_link_np(accpath, ACL_TYPE_ACCESS);
#endif
    else
        acl = acl_get_file(accpath, ACL_TYPE_ACCESS);
    if (acl != NULL) {
        setup_acl_posix1e(a, entry, acl,
            ARCHIVE_ENTRY_ACL_TYPE_ACCESS);
        acl_free(acl);
    }

    /* Only directories can have default ACLs. */
    if (S_ISDIR(archive_entry_mode(entry))) {
        acl = acl_get_file(accpath, ACL_TYPE_DEFAULT);
        if (acl != NULL) {
            setup_acl_posix1e(a, entry, acl,
                ARCHIVE_ENTRY_ACL_TYPE_DEFAULT);
            acl_free(acl);
        }
    }
    return (ARCHIVE_OK);
}

/*
 * Translate POSIX.1e ACL into libarchive internal structure.
 */
static void
setup_acl_posix1e(struct archive_read_disk *a,
    struct archive_entry *entry, acl_t acl, int archive_entry_acl_type)
{
    acl_tag_t    acl_tag;
    acl_entry_t  acl_entry;
    acl_permset_t    acl_permset;
    int      s, ae_id, ae_tag, ae_perm;
    const char  *ae_name;

    s = acl_get_entry(acl, ACL_FIRST_ENTRY, &acl_entry);
    while (s == 1) {
        ae_id = -1;
        ae_name = NULL;

        acl_get_tag_type(acl_entry, &acl_tag);
        if (acl_tag == ACL_USER) {
            ae_id = (int)*(uid_t *)acl_get_qualifier(acl_entry);
            ae_name = archive_read_disk_uname(&a->archive, ae_id);
            ae_tag = ARCHIVE_ENTRY_ACL_USER;
        } else if (acl_tag == ACL_GROUP) {
            ae_id = (int)*(gid_t *)acl_get_qualifier(acl_entry);
            ae_name = archive_read_disk_gname(&a->archive, ae_id);
            ae_tag = ARCHIVE_ENTRY_ACL_GROUP;
        } else if (acl_tag == ACL_MASK) {
            ae_tag = ARCHIVE_ENTRY_ACL_MASK;
        } else if (acl_tag == ACL_USER_OBJ) {
            ae_tag = ARCHIVE_ENTRY_ACL_USER_OBJ;
        } else if (acl_tag == ACL_GROUP_OBJ) {
            ae_tag = ARCHIVE_ENTRY_ACL_GROUP_OBJ;
        } else if (acl_tag == ACL_OTHER) {
            ae_tag = ARCHIVE_ENTRY_ACL_OTHER;
        } else {
            /* Skip types that libarchive can't support. */
            continue;
        }

        acl_get_permset(acl_entry, &acl_permset);
        ae_perm = 0;
        /*
         * acl_get_perm() is spelled differently on different
         * platforms; see above.
         */
        if (ACL_GET_PERM(acl_permset, ACL_EXECUTE))
            ae_perm |= ARCHIVE_ENTRY_ACL_EXECUTE;
        if (ACL_GET_PERM(acl_permset, ACL_READ))
            ae_perm |= ARCHIVE_ENTRY_ACL_READ;
        if (ACL_GET_PERM(acl_permset, ACL_WRITE))
            ae_perm |= ARCHIVE_ENTRY_ACL_WRITE;

        archive_entry_acl_add_entry(entry,
            archive_entry_acl_type, ae_perm, ae_tag,
            ae_id, ae_name);

        s = acl_get_entry(acl, ACL_NEXT_ENTRY, &acl_entry);
    }
}
#else
static int
setup_acls_posix1e(struct archive_read_disk *a,
    struct archive_entry *entry, int fd)
{
    (void)a;      /* UNUSED */
    (void)entry;  /* UNUSED */
    (void)fd;     /* UNUSED */
    return (ARCHIVE_OK);
}
#endif

#if HAVE_LISTXATTR && HAVE_LLISTXATTR && HAVE_GETXATTR && HAVE_LGETXATTR

/*
 * Linux extended attribute support.
 *
 * TODO:  By using a stack-allocated buffer for the first
 * call to getxattr(), we might be able to avoid the second
 * call entirely.  We only need the second call if the
 * stack-allocated buffer is too small.  But a modest buffer
 * of 1024 bytes or so will often be big enough.  Same applies
 * to listxattr().
 */


static int
setup_xattr(struct archive_read_disk *a,
    struct archive_entry *entry, const char *name, int fd)
{
    ssize_t size;
    void *value = NULL;
    const char *accpath;

    (void)fd; /* UNUSED */

    accpath = archive_entry_sourcepath(entry);
    if (accpath == NULL)
        accpath = archive_entry_pathname(entry);

    if (!a->follow_symlinks)
        size = lgetxattr(accpath, name, NULL, 0);
    else
        size = getxattr(accpath, name, NULL, 0);

    if (size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't query extended attribute");
        return (ARCHIVE_WARN);
    }

    if (size > 0 && (value = malloc(size)) == NULL) {
        archive_set_error(&a->archive, errno, "Out of memory");
        return (ARCHIVE_FATAL);
    }

    if (!a->follow_symlinks)
        size = lgetxattr(accpath, name, value, size);
    else
        size = getxattr(accpath, name, value, size);

    if (size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't read extended attribute");
        return (ARCHIVE_WARN);
    }

    archive_entry_xattr_add_entry(entry, name, value, size);

    free(value);
    return (ARCHIVE_OK);
}

static int
setup_xattrs(struct archive_read_disk *a,
    struct archive_entry *entry, int fd)
{
    char *list, *p;
    const char *path;
    ssize_t list_size;


    path = archive_entry_sourcepath(entry);
    if (path == NULL)
        path = archive_entry_pathname(entry);

    if (!a->follow_symlinks)
        list_size = llistxattr(path, NULL, 0);
    else
        list_size = listxattr(path, NULL, 0);

    if (list_size == -1) {
        if (errno == ENOTSUP)
            return (ARCHIVE_OK);
        archive_set_error(&a->archive, errno,
            "Couldn't list extended attributes");
        return (ARCHIVE_WARN);
    }

    if (list_size == 0)
        return (ARCHIVE_OK);

    if ((list = malloc(list_size)) == NULL) {
        archive_set_error(&a->archive, errno, "Out of memory");
        return (ARCHIVE_FATAL);
    }

    if (!a->follow_symlinks)
        list_size = llistxattr(path, list, list_size);
    else
        list_size = listxattr(path, list, list_size);

    if (list_size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't retrieve extended attributes");
        free(list);
        return (ARCHIVE_WARN);
    }

    for (p = list; (p - list) < list_size; p += strlen(p) + 1) {
        if (strncmp(p, "system.", 7) == 0 ||
                strncmp(p, "xfsroot.", 8) == 0)
            continue;
        setup_xattr(a, entry, p, fd);
    }

    free(list);
    return (ARCHIVE_OK);
}

#elif HAVE_EXTATTR_GET_FILE && HAVE_EXTATTR_LIST_FILE

/*
 * FreeBSD extattr interface.
 */

/* TODO: Implement this.  Follow the Linux model above, but
 * with FreeBSD-specific system calls, of course.  Be careful
 * to not include the system extattrs that hold ACLs; we handle
 * those separately.
 */
int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
    int namespace, const char *name, const char *fullname, int fd);

int
setup_xattr(struct archive_read_disk *a, struct archive_entry *entry,
    int namespace, const char *name, const char *fullname, int fd)
{
    ssize_t size;
    void *value = NULL;
    const char *accpath;

    (void)fd; /* UNUSED */

    accpath = archive_entry_sourcepath(entry);
    if (accpath == NULL)
        accpath = archive_entry_pathname(entry);

    if (!a->follow_symlinks)
        size = extattr_get_link(accpath, namespace, name, NULL, 0);
    else
        size = extattr_get_file(accpath, namespace, name, NULL, 0);

    if (size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't query extended attribute");
        return (ARCHIVE_WARN);
    }

    if (size > 0 && (value = malloc(size)) == NULL) {
        archive_set_error(&a->archive, errno, "Out of memory");
        return (ARCHIVE_FATAL);
    }

    if (!a->follow_symlinks)
        size = extattr_get_link(accpath, namespace, name, value, size);
    else
        size = extattr_get_file(accpath, namespace, name, value, size);

    if (size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't read extended attribute");
        return (ARCHIVE_WARN);
    }

    archive_entry_xattr_add_entry(entry, fullname, value, size);

    free(value);
    return (ARCHIVE_OK);
}

static int
setup_xattrs(struct archive_read_disk *a,
    struct archive_entry *entry, int fd)
{
    char buff[512];
    char *list, *p;
    ssize_t list_size;
    const char *path;
    int namespace = EXTATTR_NAMESPACE_USER;

    path = archive_entry_sourcepath(entry);
    if (path == NULL)
        path = archive_entry_pathname(entry);

    if (!a->follow_symlinks)
        list_size = extattr_list_link(path, namespace, NULL, 0);
    else
        list_size = extattr_list_file(path, namespace, NULL, 0);

    if (list_size == -1 && errno == EOPNOTSUPP)
        return (ARCHIVE_OK);
    if (list_size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't list extended attributes");
        return (ARCHIVE_WARN);
    }

    if (list_size == 0)
        return (ARCHIVE_OK);

    if ((list = malloc(list_size)) == NULL) {
        archive_set_error(&a->archive, errno, "Out of memory");
        return (ARCHIVE_FATAL);
    }

    if (!a->follow_symlinks)
        list_size = extattr_list_link(path, namespace, list, list_size);
    else
        list_size = extattr_list_file(path, namespace, list, list_size);

    if (list_size == -1) {
        archive_set_error(&a->archive, errno,
            "Couldn't retrieve extended attributes");
        free(list);
        return (ARCHIVE_WARN);
    }

    p = list;
    while ((p - list) < list_size) {
        size_t len = 255 & (int)*p;
        char *name;

        strcpy(buff, "user.");
        name = buff + strlen(buff);
        memcpy(name, p + 1, len);
        name[len] = '\0';
        setup_xattr(a, entry, namespace, name, buff, fd);
        p += 1 + len;
    }

    free(list);
    return (ARCHIVE_OK);
}

#else

/*
 * Generic (stub) extended attribute support.
 */
static int
setup_xattrs(struct archive_read_disk *a,
    struct archive_entry *entry, int fd)
{
    (void)a;     /* UNUSED */
    (void)entry; /* UNUSED */
    (void)fd;    /* UNUSED */
    return (ARCHIVE_OK);
}

#endif
