/*      @(#)create.c    8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: create.c,v 1.76 2018/11/18 23:03:36 sevan Exp $        */

/*-
 * Copyright (c) 1989, 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/param.h>
#include <sys/stat.h>

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#ifndef NO_MD5
#include <openssl/md5.h>
#endif
#ifndef NO_RMD160
#include <openssl/ripemd.h>
#endif
#ifndef NO_SHA
#include <openssl/sha.h>
#endif

#include "extern.h"

#define INDENTNAMELEN   15
#define MAXLINELEN      80

static gid_t gid;
static uid_t uid;
static mode_t mode;
static u_long flags;

#if defined(__FreeBSD__) || defined(__DragonFly__)
#define FTS_CONST const
#else
#define FTS_CONST
#endif

static int      dcmp(const FTSENT *FTS_CONST *, const FTSENT *FTS_CONST *);
static void     output(FILE *, int, int *, const char *, ...)
    __printflike(4, 5);
static int      statd(FILE *, FTS *, FTSENT *, uid_t *, gid_t *, mode_t *,
    u_long *);
static void     statf(FILE *, int, FTSENT *);

void
cwalk(FILE *fp)
{
        FTS *t;
        FTSENT *p;
        time_t clocktime;
        char host[MAXHOSTNAMELEN + 1];
        const char *user;
        char *argv[2];
        char  dot[] = ".";
        int indent = 0;

        argv[0] = dot;
        argv[1] = NULL;

        time(&clocktime);
        gethostname(host, sizeof(host));
        host[sizeof(host) - 1] = '\0';
        if ((user = getlogin()) == NULL) {
                struct passwd *pw;
                user = (pw = getpwuid(getuid())) != NULL ? pw->pw_name :
                    "<unknown>";
        }

        if (!nflag)
                fprintf(fp,
                    "#\t   user: %s\n#\tmachine: %s\n#\t   tree: %s\n"
                    "#\t   date: %s",
                    user, host, fullpath, ctime(&clocktime));

        if ((t = fts_open(argv, ftsoptions, dcmp)) == NULL)
                mtree_err("fts_open: %s", strerror(errno));
        while ((p = fts_read(t)) != NULL) {
                if (jflag)
                        indent = p->fts_level * 4;
                if (check_excludes(p->fts_name, p->fts_path)) {
                        fts_set(t, p, FTS_SKIP);
                        continue;
                }
                if (!find_only(p->fts_path)) {
                        fts_set(t, p, FTS_SKIP);
                        continue;
                }
                switch(p->fts_info) {
                case FTS_D:
                        if (!bflag)
                                fprintf(fp, "\n");
                        if (!nflag)
                                fprintf(fp, "# %s\n", p->fts_path);
                        statd(fp, t, p, &uid, &gid, &mode, &flags);
                        statf(fp, indent, p);
                        break;
                case FTS_DP:
                        if (p->fts_level > 0)
                                if (!nflag)
                                        fprintf(fp, "%*s# %s\n", indent, "",
                                            p->fts_path);
                        if (p->fts_level > 0 || flavor == F_FREEBSD9) {
                                fprintf(fp, "%*s..\n", indent, "");
                                if (!bflag)
                                        fprintf(fp, "\n");
                        }
                        break;
                case FTS_DNR:
                case FTS_ERR:
                case FTS_NS:
                        mtree_err("%s: %s",
                            p->fts_path, strerror(p->fts_errno));
                        break;
                default:
                        if (!dflag)
                                statf(fp, indent, p);
                        break;

                }
        }
        fts_close(t);
        if (sflag && keys & F_CKSUM)
                mtree_err("%s checksum: %u", fullpath, crc_total);
}

static void
dosum(FILE *fp, int indent, FTSENT *p, int *offset, int flag,
    char * (*func)(const char *, char *), const char *key)
{
        char *digestbuf = NULL;

        if ((keys & flag) == 0)
                return;

        if (func)
                digestbuf = (*func)(p->fts_accpath, NULL);
#if !defined(NO_MD5) && !defined(NO_RMD160) && !defined(NO_SHA)
        else
                digestbuf = dohash(flag, p->fts_accpath);
#endif
        if (digestbuf != NULL) {
                output(fp, indent, offset, "%s=%s", key, digestbuf);
                free(digestbuf);
                return;
        }

        if (qflag) {
                warn("%s: %s failed", p->fts_path, key);
                return;
        }

        mtree_err("%s: %s failed: %s", p->fts_path, key, strerror(errno));
}

static char *
crcFile(const char *fname, char *dummy __unused)
{
        char *ptr;
        uint32_t val, len;
        int fd, e;

        if ((fd = open(fname, O_RDONLY)) == -1)
                goto out;

        e = crc(fd, &val, &len);
        close(fd);
        if (e)
                goto out;

        if (asprintf(&ptr, "%u", val) < 0)
                goto out;

        return ptr;
out:
        mtree_err("%s: %s", fname, strerror(errno));
        return NULL;
}

static void
statf(FILE *fp, int indent, FTSENT *p)
{
        int offset;
        const char *name = NULL;

        offset = fprintf(fp, "%*s%s%s", indent, "",
            S_ISDIR(p->fts_statp->st_mode) ? "" : "    ", vispath(p->fts_name));

        if (offset > (INDENTNAMELEN + indent))
                offset = MAXLINELEN;
        else
                offset += fprintf(fp, "%*s",
                    (INDENTNAMELEN + indent) - offset, "");

        if (!S_ISREG(p->fts_statp->st_mode) && (flavor == F_NETBSD6 || !dflag))
                output(fp, indent, &offset, "type=%s",
                    inotype(p->fts_statp->st_mode));
        if (keys & (F_UID | F_UNAME) && p->fts_statp->st_uid != uid) {
                if (keys & F_UNAME &&
                    (name = user_from_uid(p->fts_statp->st_uid, 1)) != NULL)
                        output(fp, indent, &offset, "uname=%s", name);
                if (keys & F_UID || (keys & F_UNAME && name == NULL))
                        output(fp, indent, &offset, "uid=%u",
                            p->fts_statp->st_uid);
        }
        if (keys & (F_GID | F_GNAME) && p->fts_statp->st_gid != gid) {
                if (keys & F_GNAME &&
                    (name = group_from_gid(p->fts_statp->st_gid, 1)) != NULL)
                        output(fp, indent, &offset, "gname=%s", name);
                if (keys & F_GID || (keys & F_GNAME && name == NULL))
                        output(fp, indent, &offset, "gid=%u",
                            p->fts_statp->st_gid);
        }
        if (keys & F_MODE && (p->fts_statp->st_mode & MBITS) != mode)
                output(fp, indent, &offset, "mode=%#o",
                    p->fts_statp->st_mode & MBITS);
        if (keys & F_DEV &&
            (S_ISBLK(p->fts_statp->st_mode) || S_ISCHR(p->fts_statp->st_mode)))
                output(fp, indent, &offset, "device=%#jx",
                    (uintmax_t)p->fts_statp->st_rdev);
        if (keys & F_NLINK && p->fts_statp->st_nlink != 1)
                output(fp, indent, &offset, "nlink=%ju",
                    (uintmax_t)p->fts_statp->st_nlink);
        if (keys & F_SIZE &&
            (flavor == F_FREEBSD9 || S_ISREG(p->fts_statp->st_mode)))
                output(fp, indent, &offset, "size=%ju",
                    (uintmax_t)p->fts_statp->st_size);
        if (keys & F_TIME)
#if defined(BSD4_4)
                output(fp, indent, &offset, "time=%jd.%09ld",
                    (intmax_t)p->fts_statp->st_mtimespec.tv_sec,
                    p->fts_statp->st_mtimespec.tv_nsec);
#else
                output(fp, indent, &offset, "time=%jd.%09ld",
                    (intmax_t)p->fts_statp->st_mtime, (long)0);
#endif
        if (S_ISREG(p->fts_statp->st_mode))  {
                dosum(fp, indent, p, &offset, F_CKSUM, crcFile, "cksum");
#ifndef NO_MD5
                dosum(fp, indent, p, &offset, F_MD5, NULL, MD5KEY);
#endif
#ifndef NO_RMD160
                dosum(fp, indent, p, &offset, F_RMD160, NULL, RMD160KEY);
#endif
#ifndef NO_SHA
                dosum(fp, indent, p, &offset, F_SHA1, NULL, SHA1KEY);
                dosum(fp, indent, p, &offset, F_SHA256, NULL, SHA256KEY);
                dosum(fp, indent, p, &offset, F_SHA384, NULL, SHA384KEY);
                dosum(fp, indent, p, &offset, F_SHA512, NULL, SHA512KEY);
#endif
        }
        if (keys & F_SLINK &&
            (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE))
                output(fp, indent, &offset, "link=%s",
                    vispath(rlink(p->fts_accpath)));
#if HAVE_STRUCT_STAT_ST_FLAGS
        if (keys & F_FLAGS && p->fts_statp->st_flags != flags) {
                char *str = flags_to_string(p->fts_statp->st_flags, "none");
                output(fp, indent, &offset, "flags=%s", str);
                free(str);
        }
#endif
        putchar('\n');
}

/* XXX
 * FLAGS2INDEX will fail once the user and system settable bits need more
 * than one byte, respectively.
 */
#define FLAGS2INDEX(x)  (((x >> 8) & 0x0000ff00) | (x & 0x000000ff))

#define MTREE_MAXGID    5000
#define MTREE_MAXUID    5000
#define MTREE_MAXMODE   (MBITS + 1)
#if HAVE_STRUCT_STAT_ST_FLAGS
#define MTREE_MAXFLAGS  (FLAGS2INDEX(CH_MASK) + 1)   /* 1808 */
#else
#define MTREE_MAXFLAGS  1
#endif
#define MTREE_MAXS 16

static int
statd(FILE *fp, FTS *t, FTSENT *parent, uid_t *puid, gid_t *pgid, mode_t *pmode,
    u_long *pflags)
{
        FTSENT *p;
        gid_t sgid;
        uid_t suid;
        mode_t smode;
#if HAVE_STRUCT_STAT_ST_FLAGS
        u_long sflags = 0;
#endif
        const char *name = NULL;
        gid_t savegid;
        uid_t saveuid;
        mode_t savemode;
        u_long saveflags;
        u_short maxgid, maxuid, maxmode, maxflags;
        u_short g[MTREE_MAXGID], u[MTREE_MAXUID],
                m[MTREE_MAXMODE], f[MTREE_MAXFLAGS];
        static int first = 1;

        savegid = *pgid;
        saveuid = *puid;
        savemode = *pmode;
        saveflags = *pflags;
        if ((p = fts_children(t, 0)) == NULL) {
                if (errno)
                        mtree_err("%s: %s", RP(parent), strerror(errno));
                return (1);
        }

        memset(g, 0, sizeof(g));
        memset(u, 0, sizeof(u));
        memset(m, 0, sizeof(m));
        memset(f, 0, sizeof(f));

        maxuid = maxgid = maxmode = maxflags = 0;
        for (; p; p = p->fts_link) {
                if (flavor == F_NETBSD6 || !dflag ||
                    (dflag && S_ISDIR(p->fts_statp->st_mode))) {
                        smode = p->fts_statp->st_mode & MBITS;
                        if (smode < MTREE_MAXMODE && ++m[smode] > maxmode) {
                                savemode = smode;
                                maxmode = m[smode];
                        }
                        sgid = p->fts_statp->st_gid;
                        if (sgid < MTREE_MAXGID && ++g[sgid] > maxgid) {
                                savegid = sgid;
                                maxgid = g[sgid];
                        }
                        suid = p->fts_statp->st_uid;
                        if (suid < MTREE_MAXUID && ++u[suid] > maxuid) {
                                saveuid = suid;
                                maxuid = u[suid];
                        }

#if HAVE_STRUCT_STAT_ST_FLAGS
                        sflags = FLAGS2INDEX(p->fts_statp->st_flags);
                        if (sflags < MTREE_MAXFLAGS && ++f[sflags] > maxflags) {
                                saveflags = p->fts_statp->st_flags;
                                maxflags = f[sflags];
                        }
#endif
                }
        }
        /*
         * If the /set record is the same as the last one we do not need to
         * output a new one.  So first we check to see if anything changed.
         * Note that we always output a /set record for the first directory.
         */
        if (((keys & (F_UNAME | F_UID)) && (*puid != saveuid)) ||
            ((keys & (F_GNAME | F_GID)) && (*pgid != savegid)) ||
            ((keys & F_MODE) && (*pmode != savemode)) || 
            ((keys & F_FLAGS) && (*pflags != saveflags)) ||
            first) {
                first = 0;
                if (flavor != F_NETBSD6 && dflag)
                        fprintf(fp, "/set type=dir");
                else
                        fprintf(fp, "/set type=file");
                if (keys & (F_UID | F_UNAME)) {
                        if (keys & F_UNAME &&
                            (name = user_from_uid(saveuid, 1)) != NULL)
                                fprintf(fp, " uname=%s", name);
                        if (keys & F_UID || (keys & F_UNAME && name == NULL))
                                fprintf(fp, " uid=%lu", (u_long)saveuid);
                }
                if (keys & (F_GID | F_GNAME)) {
                        if (keys & F_GNAME &&
                            (name = group_from_gid(savegid, 1)) != NULL)
                                fprintf(fp, " gname=%s", name);
                        if (keys & F_GID || (keys & F_GNAME && name == NULL))
                                fprintf(fp, " gid=%lu", (u_long)savegid);
                }
                if (keys & F_MODE)
                        fprintf(fp, " mode=%#lo", (u_long)savemode);
                if (keys & F_NLINK)
                        fprintf(fp, " nlink=1");
                if (keys & F_FLAGS) {
                        char *str = flags_to_string(saveflags, "none");
                        fprintf(fp, " flags=%s", str);
                        free(str);
                }
                fprintf(fp, "\n");
                *puid = saveuid;
                *pgid = savegid;
                *pmode = savemode;
                *pflags = saveflags;
        }
        return (0);
}

/*
 * dcmp --
 *      used as a comparison function passed to fts_open() to control
 *      the order in which fts_read() returns results.  We make
 *      directories sort after non-directories, but otherwise sort in
 *      strcmp() order.
 *
 * Keep this in sync with nodecmp() in spec.c.
 */
static int
dcmp(const FTSENT *FTS_CONST *a, const FTSENT *FTS_CONST *b)
{

        if (S_ISDIR((*a)->fts_statp->st_mode)) {
                if (!S_ISDIR((*b)->fts_statp->st_mode))
                        return (1);
        } else if (S_ISDIR((*b)->fts_statp->st_mode))
                return (-1);
        return (strcmp((*a)->fts_name, (*b)->fts_name));
}

void
output(FILE *fp, int indent, int *offset, const char *fmt, ...)
{
        va_list ap;
        char buf[1024];

        va_start(ap, fmt);
        vsnprintf(buf, sizeof(buf), fmt, ap);
        va_end(ap);

        if (*offset + strlen(buf) > MAXLINELEN - 3) {
                fprintf(fp, " \\\n%*s", INDENTNAMELEN + indent, "");
                *offset = INDENTNAMELEN + indent;
        }
        *offset += fprintf(fp, " %s", buf) + 1;
}