/*      $NetBSD: create.c,v 1.11 1996/09/05 09:24:19 mycroft Exp $      */
/*      $OpenBSD: create.c,v 1.36 2023/08/11 05:07:28 guenther 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/stat.h>
#include <time.h>
#include <fcntl.h>
#include <fts.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <errno.h>
#include <unistd.h>
#include <limits.h>
#include <stdio.h>
#include <stdarg.h>
#include <vis.h>
#include <md5.h>
#include <rmd160.h>
#include <sha1.h>
#include <sha2.h>
#include "mtree.h"
#include "extern.h"

#define INDENTNAMELEN   15
#define MAXLINELEN      80

extern u_int32_t crc_total;
extern int ftsoptions;
extern int dflag, iflag, nflag, sflag;
extern u_int keys;
extern char fullpath[PATH_MAX];

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

static void     output(int, int *, const char *, ...)
                    __attribute__((__format__ (printf, 3, 4)));
static int      statd(FTS *, FTSENT *, uid_t *, gid_t *, mode_t *);
static void     statf(int, FTSENT *);

void
cwalk(void)
{
        FTS *t;
        FTSENT *p;
        time_t clock;
        char *argv[2], host[HOST_NAME_MAX+1];
        int indent = 0;

        (void)time(&clock);
        (void)gethostname(host, sizeof(host));
        (void)printf(
            "#\t   user: %s\n#\tmachine: %s\n#\t   tree: %s\n#\t   date: %s",
            getlogin(), host, fullpath, ctime(&clock));

        argv[0] = ".";
        argv[1] = NULL;
        if ((t = fts_open(argv, ftsoptions, dsort)) == NULL)
                error("fts_open: %s", strerror(errno));
        while ((p = fts_read(t))) {
                if (iflag)
                        indent = p->fts_level * 4;
                switch(p->fts_info) {
                case FTS_D:
                        if (!dflag)
                                (void)printf("\n");
                        if (!nflag)
                                (void)printf("# %s\n", p->fts_path);
                        statd(t, p, &uid, &gid, &mode);
                        statf(indent, p);
                        break;
                case FTS_DP:
                        if (!nflag && (p->fts_level > 0))
                                (void)printf("%*s# %s\n", indent, "", p->fts_path);
                        (void)printf("%*s..\n", indent, "");
                        if (!dflag)
                                (void)printf("\n");
                        break;
                case FTS_DNR:
                case FTS_ERR:
                case FTS_NS:
                        (void)fprintf(stderr, "mtree: %s: %s\n",
                            p->fts_path, strerror(p->fts_errno));
                        break;
                default:
                        if (!dflag)
                                statf(indent, p);
                        break;
                }
        }
        (void)fts_close(t);
        if (sflag && keys & F_CKSUM)
                (void)fprintf(stderr,
                    "mtree: %s checksum: %u\n", fullpath, crc_total);
}

static void
statf(int indent, FTSENT *p)
{
        u_int32_t len, val;
        int fd, offset;
        const char *name;
        char *escaped_name;
        size_t esc_len;

        esc_len = p->fts_namelen * 4 + 1;
        escaped_name = malloc(esc_len);
        if (escaped_name == NULL)
                error("statf: %s", strerror(errno));
        strnvis(escaped_name, p->fts_name, esc_len,
            VIS_WHITE | VIS_OCTAL | VIS_GLOB);

        if (iflag || S_ISDIR(p->fts_statp->st_mode))
                offset = printf("%*s%s", indent, "", escaped_name);
        else
                offset = printf("%*s    %s", indent, "", escaped_name);

        free(escaped_name);

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

        if (!S_ISREG(p->fts_statp->st_mode) && !dflag)
                output(indent, &offset, "type=%s", inotype(p->fts_statp->st_mode));
        if (p->fts_statp->st_uid != uid) {
                if (keys & F_UNAME) {
                        name = user_from_uid(p->fts_statp->st_uid, 1);
                        if (name != NULL) {
                                output(indent, &offset, "uname=%s", name);
                        } else {
                                error("could not get uname for uid=%u",
                                    p->fts_statp->st_uid);
                        }
                }
                if (keys & F_UID)
                        output(indent, &offset, "uid=%u", p->fts_statp->st_uid);
        }
        if (p->fts_statp->st_gid != gid) {
                if (keys & F_GNAME) {
                        name = group_from_gid(p->fts_statp->st_gid, 1);
                        if (name != NULL) {
                                output(indent, &offset, "gname=%s", name);
                        } else {
                                error("could not get gname for gid=%u",
                                    p->fts_statp->st_gid);
                        }
                }
                if (keys & F_GID)
                        output(indent, &offset, "gid=%u", p->fts_statp->st_gid);
        }
        if (keys & F_MODE && (p->fts_statp->st_mode & MBITS) != mode)
                output(indent, &offset, "mode=%#o", p->fts_statp->st_mode & MBITS);
        if (keys & F_NLINK && p->fts_statp->st_nlink != 1)
                output(indent, &offset, "nlink=%u", p->fts_statp->st_nlink);
        if (keys & F_SIZE && S_ISREG(p->fts_statp->st_mode))
                output(indent, &offset, "size=%lld",
                    (long long)p->fts_statp->st_size);
        if (keys & F_TIME)
                output(indent, &offset, "time=%lld.%ld",
                    (long long)p->fts_statp->st_mtim.tv_sec,
                    p->fts_statp->st_mtim.tv_nsec);
        if (keys & F_CKSUM && S_ISREG(p->fts_statp->st_mode)) {
                if ((fd = open(p->fts_accpath, MTREE_O_FLAGS)) == -1 ||
                    crc(fd, &val, &len))
                        error("%s: %s", p->fts_accpath, strerror(errno));
                (void)close(fd);
                output(indent, &offset, "cksum=%u", val);
        }
        if (keys & F_MD5 && S_ISREG(p->fts_statp->st_mode)) {
                char *md5digest, buf[MD5_DIGEST_STRING_LENGTH];

                md5digest = MD5File(p->fts_accpath,buf);
                if (!md5digest)
                        error("%s: %s", p->fts_accpath, strerror(errno));
                else
                        output(indent, &offset, "md5digest=%s", md5digest);
        }
        if (keys & F_RMD160 && S_ISREG(p->fts_statp->st_mode)) {
                char *rmd160digest, buf[RMD160_DIGEST_STRING_LENGTH];

                rmd160digest = RMD160File(p->fts_accpath,buf);
                if (!rmd160digest)
                        error("%s: %s", p->fts_accpath, strerror(errno));
                else
                        output(indent, &offset, "rmd160digest=%s", rmd160digest);
        }
        if (keys & F_SHA1 && S_ISREG(p->fts_statp->st_mode)) {
                char *sha1digest, buf[SHA1_DIGEST_STRING_LENGTH];

                sha1digest = SHA1File(p->fts_accpath,buf);
                if (!sha1digest)
                        error("%s: %s", p->fts_accpath, strerror(errno));
                else
                        output(indent, &offset, "sha1digest=%s", sha1digest);
        }
        if (keys & F_SHA256 && S_ISREG(p->fts_statp->st_mode)) {
                char *sha256digest, buf[SHA256_DIGEST_STRING_LENGTH];

                sha256digest = SHA256File(p->fts_accpath,buf);
                if (!sha256digest)
                        error("%s: %s", p->fts_accpath, strerror(errno));
                else
                        output(indent, &offset, "sha256digest=%s", sha256digest);
        }
        if (keys & F_SLINK &&
            (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
                name = rlink(p->fts_accpath);
                esc_len = strlen(name) * 4 + 1;
                escaped_name = malloc(esc_len);
                if (escaped_name == NULL)
                        error("statf: %s", strerror(errno));
                strnvis(escaped_name, name, esc_len, VIS_WHITE | VIS_OCTAL);
                output(indent, &offset, "link=%s", escaped_name);
                free(escaped_name);
        }
        if (keys & F_FLAGS && !S_ISLNK(p->fts_statp->st_mode)) {
                char *file_flags;

                file_flags = fflagstostr(p->fts_statp->st_flags);
                if (file_flags == NULL)
                        error("%s", strerror(errno));
                if (*file_flags != '\0')
                        output(indent, &offset, "flags=%s", file_flags);
                else
                        output(indent, &offset, "flags=none");
                free(file_flags);
        }
        (void)putchar('\n');
}

#define MAXGID  5000
#define MAXUID  5000
#define MAXMODE MBITS + 1

static int
statd(FTS *t, FTSENT *parent, uid_t *puid, gid_t *pgid, mode_t *pmode)
{
        FTSENT *p;
        gid_t sgid;
        uid_t suid;
        mode_t smode;
        gid_t savegid = *pgid;
        uid_t saveuid = *puid;
        mode_t savemode = *pmode;
        int maxgid;
        int maxuid;
        u_short maxmode;
        gid_t g[MAXGID];
        uid_t u[MAXUID];
        mode_t m[MAXMODE];
        const char *name;
        static int first = 1;

        if ((p = fts_children(t, 0)) == NULL) {
                if (errno)
                        error("%s: %s", RP(parent), strerror(errno));
                return (1);
        }

        bzero(g, sizeof(g));
        bzero(u, sizeof(u));
        bzero(m, sizeof(m));

        maxuid = maxgid = maxmode = 0;
        for (; p; p = p->fts_link) {
                if (!dflag || (dflag && S_ISDIR(p->fts_statp->st_mode))) {
                        smode = p->fts_statp->st_mode & MBITS;
                        if (smode < MAXMODE && ++m[smode] > maxmode) {
                                savemode = smode;
                                maxmode = m[smode];
                        }
                        sgid = p->fts_statp->st_gid;
                        if (sgid < MAXGID && ++g[sgid] > maxgid) {
                                savegid = sgid;
                                maxgid = g[sgid];
                        }
                        suid = p->fts_statp->st_uid;
                        if (suid < MAXUID && ++u[suid] > maxuid) {
                                saveuid = suid;
                                maxuid = u[suid];
                        }
                }
        }
        /*
         * 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) | (keys & F_UID)) && (*puid != saveuid)) ||
            (((keys & F_GNAME) | (keys & F_GID)) && (*pgid != savegid)) ||
            ((keys & F_MODE) && (*pmode != savemode)) || (first)) {
                first = 0;
                if (dflag)
                        (void)printf("/set type=dir");
                else
                        (void)printf("/set type=file");
                if (keys & F_UNAME) {
                        if ((name = user_from_uid(saveuid, 1)) != NULL)
                                (void)printf(" uname=%s", name);
                        else
                                error("could not get uname for uid=%u", saveuid);
                }
                if (keys & F_UID)
                        (void)printf(" uid=%u", saveuid);
                if (keys & F_GNAME) {
                        if ((name = group_from_gid(savegid, 1)) != NULL)
                                (void)printf(" gname=%s", name);
                        else
                                error("could not get gname for gid=%u", savegid);
                }
                if (keys & F_GID)
                        (void)printf(" gid=%u", savegid);
                if (keys & F_MODE)
                        (void)printf(" mode=%#o", savemode);
                if (keys & F_NLINK)
                        (void)printf(" nlink=1");
                (void)printf("\n");
                *puid = saveuid;
                *pgid = savegid;
                *pmode = savemode;
        }
        return (0);
}

int
dsort(const FTSENT **a, const FTSENT **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(int indent, int *offset, const char *fmt, ...)
{
        va_list ap;
        char buf[1024];

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

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