/*      $OpenBSD: verify.c,v 1.21 2016/08/16 16:41:46 krw Exp $ */
/*      $NetBSD: verify.c,v 1.10 1995/03/07 21:26:28 cgd Exp $  */

/*-
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <sys/stat.h>
#include <dirent.h>
#include <fts.h>
#include <fnmatch.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <limits.h>
#include "mtree.h"
#include "extern.h"

extern u_int32_t crc_total;
extern int ftsoptions;
extern int dflag, eflag, qflag, rflag, sflag, uflag;
extern char fullpath[PATH_MAX];

static NODE *root;
static char path[PATH_MAX];

static void     miss(NODE *, char *, size_t);
static int      vwalk(void);

int
verify(void)
{
        int rval;

        root = spec();
        rval = vwalk();
        miss(root, path, sizeof(path));
        return (rval);
}

static int
vwalk(void)
{
        FTS *t;
        FTSENT *p;
        NODE *ep, *level;
        int specdepth, rval;
        char *argv[2];

        argv[0] = ".";
        argv[1] = NULL;
        if ((t = fts_open(argv, ftsoptions, dsort)) == NULL)
                error("fts_open: %s", strerror(errno));
        level = root;
        specdepth = rval = 0;
        while ((p = fts_read(t))) {
                switch(p->fts_info) {
                case FTS_D:
                        break;
                case FTS_DP:
                        if (specdepth > p->fts_level) {
                                for (level = level->parent; level->prev;
                                      level = level->prev);
                                --specdepth;
                        }
                        continue;
                case FTS_DNR:
                case FTS_ERR:
                case FTS_NS:
                        (void)fprintf(stderr, "mtree: %s: %s\n",
                            RP(p), strerror(p->fts_errno));
                        continue;
                default:
                        if (dflag)
                                continue;
                }

                if (specdepth != p->fts_level)
                        goto extra;
                for (ep = level; ep; ep = ep->next)
                        if ((ep->flags & F_MAGIC &&
                            !fnmatch(ep->name, p->fts_name, FNM_PATHNAME)) ||
                            !strcmp(ep->name, p->fts_name)) {
                                ep->flags |= F_VISIT;
                                if ((ep->flags & F_NOCHANGE) == 0 &&
                                    compare(ep->name, ep, p))
                                        rval = MISMATCHEXIT;
                                if (ep->flags & F_IGN)
                                        (void)fts_set(t, p, FTS_SKIP);
                                else if (ep->child && ep->type == F_DIR &&
                                    p->fts_info == FTS_D) {
                                        level = ep->child;
                                        ++specdepth;
                                }
                                break;
                        }

                if (ep)
                        continue;
extra:
                if (!eflag) {
                        (void)printf("extra: %s", RP(p));
                        if (rflag) {
                                if ((S_ISDIR(p->fts_statp->st_mode)
                                    ? rmdir : unlink)(p->fts_accpath)) {
                                        (void)printf(", not removed: %s",
                                            strerror(errno));
                                        rval = ERROREXIT;
                                } else
                                        (void)printf(", removed");
                        } else
                                rval = MISMATCHEXIT;
                        (void)putchar('\n');
                }
                (void)fts_set(t, p, FTS_SKIP);
        }
        (void)fts_close(t);
        if (sflag)
                (void)fprintf(stderr,
                    "mtree: %s checksum: %u\n", fullpath, crc_total);
        return (rval);
}

static void
miss(NODE *p, char *tail, size_t len)
{
        int create;
        char *tp;

        for (; p; p = p->next) {
                if ((p->flags & F_OPT) && !(p->flags & F_VISIT))
                        continue;
                if (p->type != F_DIR && (dflag || p->flags & F_VISIT))
                        continue;
                (void)strlcpy(tail, p->name, len);
                if (!(p->flags & F_VISIT)) {
                        /* Don't print missing message if file exists as a
                           symbolic link and the -q flag is set. */
                        struct stat statbuf;

                        if (qflag && stat(path, &statbuf) == 0)
                                p->flags |= F_VISIT;
                        else
                                (void)printf("missing: %s", path);
                }
                if (p->type != F_DIR) {
                        putchar('\n');
                        continue;
                }

                create = 0;
                if (!(p->flags & F_VISIT) && uflag) {
                        if (!(p->flags & (F_UID | F_UNAME)))
                            (void)printf(" (not created: user not specified)");
                        else if (!(p->flags & (F_GID | F_GNAME)))
                            (void)printf(" (not created: group not specified)");
                        else if (!(p->flags & F_MODE))
                            (void)printf(" (not created: mode not specified)");
                        else if (mkdir(path, S_IRWXU))
                                (void)printf(" (not created: %s)",
                                    strerror(errno));
                        else {
                                create = 1;
                                (void)printf(" (created)");
                        }
                }

                if (!(p->flags & F_VISIT))
                        (void)putchar('\n');

                for (tp = tail; *tp; ++tp);
                *tp = '/';
                miss(p->child, tp + 1, len - (tp + 1 - tail));
                *tp = '\0';

                if (!create)
                        continue;
                if (chown(path, p->st_uid, p->st_gid)) {
                        (void)printf("%s: user/group/mode not modified: %s\n",
                            path, strerror(errno));
                        continue;
                }
                if (chmod(path, p->st_mode))
                        (void)printf("%s: permissions not set: %s\n",
                            path, strerror(errno));
        }
}