/*-
 * CPDUP.C
 *
 * CPDUP <options> source destination
 *
 * (c) Copyright 1997-1999 by Matthew Dillon and Dima Ruban.  Permission to
 *     use and distribute based on the FreeBSD copyright.  Supplied as-is,
 *     USE WITH EXTREME CAUTION.
 *
 * This program attempts to duplicate the source onto the destination as
 * exactly as possible, retaining modify times, flags, perms, uid, and gid.
 * It can duplicate devices, files (including hardlinks), softlinks,
 * directories, and so forth.  It is recursive by default!  The duplication
 * is inclusive of removal of files/directories on the destination that do
 * not exist on the source.  This program supports a per-directory exception
 * file called .cpignore, or a user-specified exception file.
 *
 * Safety features:
 *
 *      - does not cross partition boundries on source
 *      - asks for confirmation on deletions unless -i0 is specified
 *      - refuses to replace a destination directory with a source file
 *        unless -s0 is specified.
 *      - terminates on error
 *
 * Copying features:
 *
 *      - does not copy file if mtime, flags, perms, and size match unless
 *        forced
 *
 *      - copies to temporary and renames-over the original, allowing
 *        you to update live systems
 *
 *      - copies uid, gid, mtime, perms, flags, softlinks, devices, hardlinks,
 *        and recurses through directories.
 *
 *      - accesses a per-directory exclusion file, .cpignore, containing
 *        standard wildcarded ( ? / * style, NOT regex) exclusions.
 *
 *      - tries to play permissions and flags smart in regards to overwriting
 *        schg files and doing related stuff.
 *
 *      - Can do MD5 consistancy checks
 *
 *      - Is able to do incremental mirroring/backups via hardlinks from
 *        the 'previous' version (supplied with -H path).
 */

/*-
 * Example: cc -O cpdup.c -o cpdup -lcrypto
 *
 * ".MD5.CHECKSUMS" contains md5 checksumms for the current directory.
 * This file is stored on the source.
 */

#include "cpdup.h"
#include "hclink.h"
#include "hcproto.h"

#define HSIZE   8192
#define HMASK   (HSIZE-1)
#define HLSIZE  8192
#define HLMASK  (HLSIZE - 1)

#define GETBUFSIZE      8192
#define GETPATHSIZE     2048
#define GETLINKSIZE     1024
#define GETIOSIZE       65536

#ifndef _ST_FLAGS_PRESENT_
#define st_flags        st_mode
#endif

typedef struct Node {
    struct Node *no_Next;
    struct Node *no_HNext;
    struct stat *no_Stat;
    int  no_Value;
    char no_Name[4];
} Node;

typedef struct List {
    Node        li_Node;
    Node        *li_Hash[HSIZE];
} List;

struct hlink {
    ino_t ino;
    ino_t dino;
    int refs;
    struct hlink *next;
    struct hlink *prev;
    nlink_t nlinked;
    char name[];
};

typedef struct copy_info {
        char *spath;
        char *dpath;
        dev_t sdevNo;
        dev_t ddevNo;
} *copy_info_t;

static struct hlink *hltable[HLSIZE];

static void RemoveRecur(const char *dpath, dev_t devNo, struct stat *dstat);
static void InitList(List *list);
static void ResetList(List *list);
static Node *IterateList(List *list, Node *node, int n);
static int AddList(List *list, const char *name, int n, struct stat *st);
static int CheckList(List *list, const char *path, const char *name);
static int getbool(const char *str);
static char *SplitRemote(char **pathp);
static int ChgrpAllowed(gid_t g);
static int OwnerMatch(struct stat *st1, struct stat *st2);
#ifdef _ST_FLAGS_PRESENT_
static int FlagsMatch(struct stat *st1, struct stat *st2);
#else
#define FlagsMatch(st1, st2)    1
#endif
static struct hlink *hltlookup(struct stat *);
static struct hlink *hltadd(struct stat *, const char *);
static char *checkHLPath(struct stat *st, const char *spath, const char *dpath);
static int validate_check(const char *spath, const char *dpath);
static int shash(const char *s);
static void hltdelete(struct hlink *);
static void hltsetdino(struct hlink *, ino_t);
static int YesNo(const char *path);
static int xrename(const char *src, const char *dst, u_long flags);
static int xlink(const char *src, const char *dst, u_long flags);
static int xremove(struct HostConf *host, const char *path);
static int xrmdir(struct HostConf *host, const char *path);
static int DoCopy(copy_info_t info, struct stat *stat1, int depth);
static int ScanDir(List *list, struct HostConf *host, const char *path,
        int64_t *CountReadBytes, int n);
static int mtimecmp(struct stat *st1, struct stat *st2);
static int symlink_mfo_test(struct HostConf *hc, struct stat *st1,
        struct stat *st2);

int AskConfirmation = 1;
int SafetyOpt = 1;
int ForceOpt;
int DeviceOpt = 1;
int VerboseOpt;
int DirShowOpt;
int NotForRealOpt;
int QuietOpt;
int NoRemoveOpt;
int UseMD5Opt;
int SummaryOpt;
int CompressOpt;
int SlaveOpt;
int ReadOnlyOpt;
int ValidateOpt;
int ssh_argc;
const char *ssh_argv[16];
int DstRootPrivs;

const char *UseCpFile;
const char *MD5CacheFile;
const char *UseHLPath;

static int DstBaseLen;
static int HardLinkCount;
static int GroupCount;
static gid_t *GroupList;

int64_t CountSourceBytes;
int64_t CountSourceItems;
int64_t CountCopiedItems;
int64_t CountSourceReadBytes;
int64_t CountTargetReadBytes;
int64_t CountWriteBytes;
int64_t CountRemovedItems;
int64_t CountLinkedItems;

static struct HostConf SrcHost;
static struct HostConf DstHost;

int
main(int ac, char **av)
{
    int i;
    int opt;
    char *src = NULL;
    char *dst = NULL;
    char *ptr;
    struct timeval start;
    struct copy_info info;

    signal(SIGPIPE, SIG_IGN);

    gettimeofday(&start, NULL);
    opterr = 0;
    while ((opt = getopt(ac, av, ":CdF:fH:hIi:j:lM:mnoqRSs:uVvX:x")) != -1) {
        switch (opt) {
        case 'C':
            CompressOpt = 1;
            break;
        case 'd':
            DirShowOpt = 1;
            break;
        case 'F':
            if (ssh_argc >= 16)
                fatal("too many -F options");
            ssh_argv[ssh_argc++] = optarg;
            break;
        case 'f':
            ForceOpt = 1;
            break;
        case 'H':
            UseHLPath = optarg;
            break;
        case 'h':
            fatal(NULL);
            /* not reached */
            break;
        case 'I':
            SummaryOpt = 1;
            break;
        case 'i':
            AskConfirmation = getbool(optarg);
            break;
        case 'j':
            DeviceOpt = getbool(optarg);
            break;
        case 'l':
            setlinebuf(stdout);
            setlinebuf(stderr);
            break;
        case 'M':
            UseMD5Opt = 1;
            MD5CacheFile = optarg;
            break;
        case 'm':
            UseMD5Opt = 1;
            MD5CacheFile = ".MD5.CHECKSUMS";
            break;
        case 'n':
            NotForRealOpt = 1;
            break;
        case 'o':
            NoRemoveOpt = 1;
            break;
        case 'q':
            QuietOpt = 1;
            break;
        case 'R':
            ReadOnlyOpt = 1;
            break;
        case 'S':
            SlaveOpt = 1;
            break;
        case 's':
            SafetyOpt = getbool(optarg);
            break;
        case 'u':
            setvbuf(stdout, NULL, _IOLBF, 0);
            break;
        case 'V':
            ++ValidateOpt;
            break;
        case 'v':
            ++VerboseOpt;
            break;
        case 'X':
            UseCpFile = optarg;
            break;
        case 'x':
            UseCpFile = ".cpignore";
            break;
        case ':':
            fatal("missing argument for option: -%c\n", optopt);
            /* not reached */
            break;
        case '?':
            fatal("illegal option: -%c\n", optopt);
            /* not reached */
            break;
        default:
            fatal(NULL);
            /* not reached */
            break;
        }
    }
    ac -= optind;
    av += optind;
    if (ac > 0)
        src = av[0];
    if (ac > 1)
        dst = av[1];
    if (ac > 2)
        fatal("too many arguments");

    /*
     * If we are told to go into slave mode, run the HC protocol
     */
    if (SlaveOpt) {
        DstRootPrivs = (geteuid() == 0);
        hc_slave(0, 1);
        exit(0);
    }

    /*
     * Extract the source and/or/neither target [user@]host and
     * make any required connections.
     */
    if (src && (ptr = SplitRemote(&src)) != NULL) {
        SrcHost.host = src;
        src = ptr;
        if (UseMD5Opt)
            fatal("The MD5 options are not currently supported for remote sources");
        if (hc_connect(&SrcHost, ReadOnlyOpt) < 0)
            exit(1);
    } else {
        SrcHost.version = HCPROTO_VERSION;
        if (ReadOnlyOpt)
            fatal("The -R option is only supported for remote sources");
    }

    if (dst && (ptr = SplitRemote(&dst)) != NULL) {
        DstHost.host = dst;
        dst = ptr;
        if (hc_connect(&DstHost, 0) < 0)
            exit(1);
    } else {
        DstHost.version = HCPROTO_VERSION;
    }

    /*
     * dst may be NULL only if -m option is specified,
     * which forces an update of the MD5 checksums
     */
    if (dst == NULL && UseMD5Opt == 0) {
        fatal(NULL);
        /* not reached */
    }

    if (dst) {
        DstRootPrivs = (hc_geteuid(&DstHost) == 0);
        if (!DstRootPrivs)
            GroupCount = hc_getgroups(&DstHost, &GroupList);
    }
#if 0
    /* XXXX DEBUG */
    fprintf(stderr, "DstRootPrivs == %s\n", DstRootPrivs ? "true" : "false");
    fprintf(stderr, "GroupCount == %d\n", GroupCount);
    for (i = 0; i < GroupCount; i++)
        fprintf(stderr, "Group[%d] == %d\n", i, GroupList[i]);
#endif

    bzero(&info, sizeof(info));
    if (dst) {
        DstBaseLen = strlen(dst);
        info.spath = src;
        info.dpath = dst;
        info.sdevNo = (dev_t)-1;
        info.ddevNo = (dev_t)-1;
        i = DoCopy(&info, NULL, -1);
    } else {
        info.spath = src;
        info.dpath = NULL;
        info.sdevNo = (dev_t)-1;
        info.ddevNo = (dev_t)-1;
        i = DoCopy(&info, NULL, -1);
    }
#ifndef NOMD5
    md5_flush();
#endif

    if (SummaryOpt && i == 0) {
        double duration;
        struct timeval end;

        gettimeofday(&end, NULL);
#if 0
        /* don't count stat's in our byte statistics */
        CountSourceBytes += sizeof(struct stat) * CountSourceItems;
        CountSourceReadBytes += sizeof(struct stat) * CountSourceItems;
        CountWriteBytes +=  sizeof(struct stat) * CountCopiedItems;
        CountWriteBytes +=  sizeof(struct stat) * CountRemovedItems;
#endif

        duration = (end.tv_sec - start.tv_sec);
        duration += (double)(end.tv_usec - start.tv_usec) / 1000000.0;
        if (duration == 0.0)
                duration = 1.0;
        logstd("cpdup completed successfully\n");
        logstd("%lld bytes source, %lld src bytes read, %lld tgt bytes read\n"
               "%lld bytes written (%.1fX speedup)\n",
            (long long)CountSourceBytes,
            (long long)CountSourceReadBytes,
            (long long)CountTargetReadBytes,
            (long long)CountWriteBytes,
            ((double)CountSourceBytes * 2.0) / ((double)(CountSourceReadBytes + CountTargetReadBytes + CountWriteBytes)));
        logstd("%lld source items, %lld items copied, %lld items linked, "
               "%lld things deleted\n",
            (long long)CountSourceItems,
            (long long)CountCopiedItems,
            (long long)CountLinkedItems,
            (long long)CountRemovedItems);
        logstd("%.1f seconds %5d Kbytes/sec synced %5d Kbytes/sec scanned\n",
            duration,
            (int)((CountSourceReadBytes + CountTargetReadBytes + CountWriteBytes) / duration  / 1024.0),
            (int)(CountSourceBytes / duration / 1024.0));
    }
    exit((i == 0) ? 0 : 1);
}

static int
getbool(const char *str)
{
    if (strcmp(str, "0") == 0)
        return (0);
    if (strcmp(str, "1") == 0)
        return (1);
    fatal("option requires boolean argument (0 or 1): -%c\n", optopt);
    /* not reached */
    return (0);
}

/*
 * Check if path specifies a remote path, using the same syntax as scp(1),
 * i.e. a path is considered remote if the first colon is not preceded by
 * a slash, so e.g. "./foo:bar" is considered local.
 * If a remote path is detected, the colon is replaced with a null byte,
 * and the return value is a pointer to the next character.
 * Otherwise NULL is returned.
 *
 * A path prefix of localhost is the same as a locally specified file or
 * directory path, but prevents any further interpretation of the path
 * as being a remote hostname (for paths that have colons in them).
 */
static char *
SplitRemote(char **pathp)
{
    int cindex;
    char *path = *pathp;

    if (path[(cindex = strcspn(path, ":/"))] == ':') {
        path[cindex++] = 0;
        if (strcmp(path, "localhost") != 0)
                return (path + cindex);
        *pathp = path + cindex;
    }
    return (NULL);
}

/*
 * Check if group g is in our GroupList.
 *
 * Typically the number of groups a user belongs to isn't large
 * enough to warrant more effort than a simple linear search.
 * However, we perform an optimization by moving a group to the
 * top of the list when we have a hit.  This assumes that there
 * isn't much variance in the gids of files that a non-root user
 * copies.  So most of the time the search will terminate on the
 * first element of the list.
 */
static int
ChgrpAllowed(gid_t g)
{
    int i;

    for (i = 0; i < GroupCount; i++)
        if (GroupList[i] == g) {
            if (i > 0) {
                /* Optimize: Move g to the front of the list. */
                for (; i > 0; i--)
                    GroupList[i] = GroupList[i - 1];
                GroupList[0] = g;
            }
            return (1);
        }
    return (0);
}

/*
 * The following two functions return true if the ownership (UID + GID)
 * or the flags of two files match, respectively.
 *
 * Only perform weak checking if we don't have sufficient privileges on
 * the target machine, so we don't waste transfers with things that are
 * bound to fail anyway.
 */
static int
OwnerMatch(struct stat *st1, struct stat *st2)
{
    if (DstRootPrivs)
        /* Both UID and GID must match. */
        return (st1->st_uid == st2->st_uid && st1->st_gid == st2->st_gid);
    else
        /* Ignore UID, and also ignore GID if we can't chgrp to that group. */
        return (st1->st_gid == st2->st_gid || !ChgrpAllowed(st1->st_gid));
}

#ifdef _ST_FLAGS_PRESENT_
static int
FlagsMatch(struct stat *st1, struct stat *st2)
{
/*
 * Ignore UF_ARCHIVE.  It gets set automatically by the filesystem, for
 * filesystems that support it.  If the destination filesystem supports it, but
 * it's cleared on the source file, then multiple invocations of cpdup would
 * all try to copy the file because the flags wouldn't match.
 *
 * When unpriveleged, ignore flags we can't set
 */
    u_long ignored = DstRootPrivs ? 0 : SF_SETTABLE;

#ifdef UF_ARCHIVE
    ignored |= UF_ARCHIVE;
#endif
    return (((st1->st_flags ^ st2->st_flags) & ~ignored) == 0);
}
#endif


static struct hlink *
hltlookup(struct stat *stp)
{
    struct hlink *hl;
    int n;

    n = stp->st_ino & HLMASK;

    for (hl = hltable[n]; hl; hl = hl->next) {
        if (hl->ino == stp->st_ino) {
            ++hl->refs;
            return hl;
        }
    }

    return NULL;
}

static struct hlink *
hltadd(struct stat *stp, const char *path)
{
    struct hlink *new;
    int plen = strlen(path);
    int n;

    new = malloc(offsetof(struct hlink, name[plen + 1]));
    if (new == NULL)
        fatal("out of memory");
    ++HardLinkCount;

    /* initialize and link the new element into the table */
    new->ino = stp->st_ino;
    new->dino = (ino_t)-1;
    new->refs = 1;
    bcopy(path, new->name, plen + 1);
    new->nlinked = 1;
    new->prev = NULL;
    n = stp->st_ino & HLMASK;
    new->next = hltable[n];
    if (hltable[n])
        hltable[n]->prev = new;
    hltable[n] = new;

    return new;
}

static void
hltsetdino(struct hlink *hl, ino_t inum)
{
    hl->dino = inum;
}

static void
hltdelete(struct hlink *hl)
{
    assert(hl->refs == 1);
    --hl->refs;
    if (hl->prev) {
        if (hl->next)
            hl->next->prev = hl->prev;
        hl->prev->next = hl->next;
    } else {
        if (hl->next)
            hl->next->prev = NULL;

        hltable[hl->ino & HLMASK] = hl->next;
    }
    --HardLinkCount;
    free(hl);
}

static void
hltrels(struct hlink *hl)
{
    assert(hl->refs == 1);
    --hl->refs;
}

/*
 * If UseHLPath is defined check to see if the file in question is
 * the same as the source file, and if it is return a pointer to the
 * -H path based file for hardlinking.  Else return NULL.
 */
static char *
checkHLPath(struct stat *st1, const char *spath, const char *dpath)
{
    struct stat sthl;
    char *hpath;
    int error;

    if (asprintf(&hpath, "%s%s", UseHLPath, dpath + DstBaseLen) < 0)
        fatal("out of memory");

    /*
     * stat info matches ?
     */
    if (hc_stat(&DstHost, hpath, &sthl) < 0 ||
        st1->st_size != sthl.st_size ||
        mtimecmp(st1, &sthl) != 0 ||
        !OwnerMatch(st1, &sthl) ||
        !FlagsMatch(st1, &sthl)
    ) {
        free(hpath);
        return(NULL);
    }

    /*
     * If ForceOpt or ValidateOpt is set we have to compare the files
     */
    if (ForceOpt || ValidateOpt) {
        error = validate_check(spath, hpath);
        if (error) {
            free(hpath);
            hpath = NULL;
        }
    }
    return(hpath);
}

/*
 * Return 0 if the contents of the file <spath> matches the contents of
 * the file <dpath>.
 */
static int
validate_check(const char *spath, const char *dpath)
{
    int error;
    int fd1;
    int fd2;

    fd1 = hc_open(&SrcHost, spath, O_RDONLY, 0);
    fd2 = hc_open(&DstHost, dpath, O_RDONLY, 0);
    error = -1;

    if (fd1 >= 0 && fd2 >= 0) {
        int n;
        int x;
        char *iobuf1 = malloc(GETIOSIZE);
        char *iobuf2 = malloc(GETIOSIZE);

        while ((n = hc_read(&SrcHost, fd1, iobuf1, GETIOSIZE)) > 0) {
            CountSourceReadBytes += n;
            x = hc_read(&DstHost, fd2, iobuf2, GETIOSIZE);
            if (x > 0)
                    CountTargetReadBytes += x;
            if (x != n)
                break;
            if (bcmp(iobuf1, iobuf2, n) != 0)
                break;
        }
        free(iobuf1);
        free(iobuf2);
        if (n == 0)
            error = 0;
    }
    if (fd1 >= 0)
        hc_close(&SrcHost, fd1);
    if (fd2 >= 0)
        hc_close(&DstHost, fd2);
    return (error);
}

int
DoCopy(copy_info_t info, struct stat *stat1, int depth)
{
    const char *spath = info->spath;
    const char *dpath = info->dpath;
    dev_t sdevNo = info->sdevNo;
    dev_t ddevNo = info->ddevNo;
    struct stat st1;
    struct stat st2;
    unsigned long st2_flags;
    int r, mres, fres, st2Valid;
    struct hlink *hln;
    uint64_t size;

    r = mres = fres = st2Valid = 0;
    st2_flags = 0;
    size = 0;
    hln = NULL;

    if (stat1 == NULL) {
        if (hc_lstat(&SrcHost, spath, &st1) != 0) {
            r = 1;
            goto done;
        }
        stat1 = &st1;
    }
#ifdef SF_SNAPSHOT
    /* skip snapshot files because they're sparse and _huge_ */
    if (stat1->st_flags & SF_SNAPSHOT)
       return(0);
#endif
    st2.st_mode = 0;    /* in case lstat fails */
    st2.st_flags = 0;   /* in case lstat fails */
    if (dpath && hc_lstat(&DstHost, dpath, &st2) == 0) {
        st2Valid = 1;
#ifdef _ST_FLAGS_PRESENT_
        st2_flags = st2.st_flags;
#endif
    }

    if (S_ISREG(stat1->st_mode))
        size = stat1->st_size;

    /*
     * Handle hardlinks
     */

    if (S_ISREG(stat1->st_mode) && stat1->st_nlink > 1 && dpath) {
        if ((hln = hltlookup(stat1)) != NULL) {
            hln->nlinked++;

            if (st2Valid) {
                if (st2.st_ino == hln->dino) {
                    /*
                     * hard link is already correct, nothing to do
                     */
                    if (VerboseOpt >= 3)
                        logstd("%-32s nochange\n", (dpath) ? dpath : spath);
                    if (hln->nlinked == stat1->st_nlink) {
                        hltdelete(hln);
                        hln = NULL;
                    }
                    CountSourceItems++;
                    r = 0;
                    goto done;
                } else {
                    /*
                     * hard link is not correct, attempt to unlink it
                     */
                    if (xremove(&DstHost, dpath) < 0) {
                        logerr("%-32s hardlink: unable to unlink: %s\n",
                            ((dpath) ? dpath : spath), strerror(errno));
                        hltdelete(hln);
                        hln = NULL;
                        ++r;
                        goto done;
                    }
                }
            }

            if (xlink(hln->name, dpath, stat1->st_flags) < 0) {
                int tryrelink = (errno == EMLINK);
                logerr("%-32s hardlink: unable to link to %s: %s\n",
                    (dpath ? dpath : spath), hln->name, strerror(errno)
                );
                hltdelete(hln);
                hln = NULL;
                if (tryrelink) {
                    logerr("%-20s hardlink: will attempt to copy normally\n",
                        (dpath ? dpath : spath));
                    goto relink;
                }
                ++r;
            } else {
                if (hln->nlinked == stat1->st_nlink) {
                    hltdelete(hln);
                    hln = NULL;
                }
                if (r == 0) {
                    if (VerboseOpt) {
                        logstd("%-32s hardlink: %s\n",
                            (dpath ? dpath : spath),
                            (st2Valid ? "relinked" : "linked")
                        );
                    }
                    CountSourceItems++;
                    CountCopiedItems++;
                    r = 0;
                    goto done;
                }
            }
        } else {
            /*
             * first instance of hardlink must be copied normally
             */
relink:
            hln = hltadd(stat1, dpath);
        }
    }

    /*
     * Do we need to copy the file/dir/link/whatever?  Early termination
     * if we do not.  Always traverse directories.  Always redo links.
     *
     * NOTE: st2Valid is true only if dpath != NULL *and* dpath stats good.
     */

    if (
        st2Valid
        && stat1->st_mode == st2.st_mode
        && FlagsMatch(stat1, &st2)
    ) {
        if (S_ISLNK(stat1->st_mode) || S_ISDIR(stat1->st_mode)) {
            ;
        } else {
            if (ForceOpt == 0 &&
                stat1->st_size == st2.st_size &&
                (ValidateOpt == 2 || mtimecmp(stat1, &st2) == 0) &&
                OwnerMatch(stat1, &st2)
#ifndef NOMD5
                && (UseMD5Opt == 0 || !S_ISREG(stat1->st_mode) ||
                    (mres = md5_check(spath, dpath)) == 0)
#endif
                && (ValidateOpt == 0 || !S_ISREG(stat1->st_mode) ||
                    validate_check(spath, dpath) == 0)
            ) {
                /*
                 * The files are identical, but if we are running as
                 * root we might need to adjust ownership/group/flags.
                 */
                int changedown = 0;
                int changedflags = 0;

                if (hln)
                    hltsetdino(hln, st2.st_ino);

                if (!OwnerMatch(stat1, &st2)) {
                    hc_chown(&DstHost, dpath, stat1->st_uid, stat1->st_gid);
                    changedown = 1;
                }
#ifdef _ST_FLAGS_PRESENT_
                if (!FlagsMatch(stat1, &st2)) {
                    hc_chflags(&DstHost, dpath, stat1->st_flags);
                    changedflags = 1;
                }
#endif
                if (VerboseOpt >= 3) {
#ifndef NOMD5
                    if (UseMD5Opt) {
                        logstd("%-32s md5-nochange",
                                (dpath ? dpath : spath));
                    } else
#endif
                    if (ValidateOpt) {
                        logstd("%-32s nochange (contents validated)",
                                (dpath ? dpath : spath));
                    } else {
                        logstd("%-32s nochange", (dpath ? dpath : spath));
                    }
                    if (changedown)
                        logstd(" (uid/gid differ)");
                    if (changedflags)
                        logstd(" (flags differ)");
                    logstd("\n");
                }
                CountSourceBytes += size;
                CountSourceItems++;
                r = 0;
                goto done;
            }
        }
    }
    if (st2Valid && !S_ISDIR(stat1->st_mode) && S_ISDIR(st2.st_mode)) {
        if (SafetyOpt) {
            logerr("%-32s SAFETY - refusing to copy file over directory\n",
                (dpath ? dpath : spath)
            );
            ++r;                /* XXX */
            r = 0;
            goto done;          /* continue with the cpdup anyway */
        }
        if (QuietOpt == 0 || AskConfirmation) {
            logstd("%-32s WARNING: non-directory source will blow away\n"
                   "%-32s preexisting dest directory, continuing anyway!\n",
                   ((dpath) ? dpath : spath), "");
        }
        if (dpath)
            RemoveRecur(dpath, ddevNo, &st2);
        st2Valid = 0;
    }

    /*
     * The various comparisons failed, copy it.
     */
    if (S_ISDIR(stat1->st_mode)) {
        int skipdir = 0;

        if (dpath) {
            if (!st2Valid || S_ISDIR(st2.st_mode) == 0) {
                if (st2Valid)
                    xremove(&DstHost, dpath);
                if (hc_mkdir(&DstHost, dpath, stat1->st_mode | 0700) != 0) {
                    logerr("%s: mkdir failed: %s\n",
                        (dpath ? dpath : spath), strerror(errno));
                    r = 1;
                    skipdir = 1;
                }
                if (hc_lstat(&DstHost, dpath, &st2) != 0) {
                    if (NotForRealOpt == 0)
                            logerr("%s: lstat of newly made dir failed: %s\n",
                                   (dpath ? dpath : spath), strerror(errno));
                    st2Valid = 0;
                    r = 1;
                    skipdir = 1;
                }
                else {
                    st2Valid = 1;
                    if (!OwnerMatch(stat1, &st2) &&
                        hc_chown(&DstHost, dpath, stat1->st_uid, stat1->st_gid) != 0
                    ) {
                        logerr("%s: chown of newly made dir failed: %s\n",
                            (dpath ? dpath : spath), strerror(errno));
                        r = 1;
                        /* Note that we should not set skipdir = 1 here. */
                    }
                }
                if (VerboseOpt)
                    logstd("%-32s mkdir-ok\n", (dpath ? dpath : spath));
                CountCopiedItems++;
            } else {
                /*
                 * Directory must be scanable by root for cpdup to
                 * work.  We'll fix it later if the directory isn't
                 * supposed to be readable ( which is why we fixup
                 * st2.st_mode to match what we did ).
                 */
                if ((st2.st_mode & 0700) != 0700) {
                    hc_chmod(&DstHost, dpath, st2.st_mode | 0700);
                    st2.st_mode |= 0700;
                }
                if (VerboseOpt >= 2)
                    logstd("%s\n", dpath ? dpath : spath);
            }
        }

        /*
         * When copying a directory, stop if the source crosses a mount
         * point.
         */
        if (sdevNo != (dev_t)-1 && stat1->st_dev != sdevNo)
            skipdir = 1;
        else
            sdevNo = stat1->st_dev;

        /*
         * When copying a directory, stop if the destination crosses
         * a mount point.
         *
         * The target directory will have been created and stat'd
         * for st2 if it did not previously exist.   st2Valid is left
         * as a flag.  If the stat failed st2 will still only have its
         * default initialization.
         *
         * So we simply assume here that the directory is within the
         * current target mount if we had to create it (aka st2Valid is 0)
         * and we leave ddevNo alone.
         */
        if (st2Valid) {
            if (ddevNo != (dev_t)-1 && st2.st_dev != ddevNo)
                skipdir = 1;
            else
                ddevNo = st2.st_dev;
        }

        if (!skipdir) {
            List *list = malloc(sizeof(List));
            Node *node;

            if (DirShowOpt)
                logstd("Scanning %s ...\n", spath);
            InitList(list);
            if (ScanDir(list, &SrcHost, spath, &CountSourceReadBytes, 0) == 0) {
                node = NULL;
                while ((node = IterateList(list, node, 0)) != NULL) {
                    char *nspath;
                    char *ndpath = NULL;

                    nspath = mprintf("%s/%s", spath, node->no_Name);
                    if (dpath)
                        ndpath = mprintf("%s/%s", dpath, node->no_Name);

                    info->spath = nspath;
                    info->dpath = ndpath;
                    info->sdevNo = sdevNo;
                    info->ddevNo = ddevNo;
                    if (depth < 0)
                        r += DoCopy(info, node->no_Stat, depth);
                    else
                        r += DoCopy(info, node->no_Stat, depth + 1);
                    free(nspath);
                    if (ndpath)
                        free(ndpath);
                    info->spath = NULL;
                    info->dpath = NULL;
                }

                /*
                 * Remove files/directories from destination that do not appear
                 * in the source.
                 */
                if (dpath && ScanDir(list, &DstHost, dpath,
                                     &CountTargetReadBytes, 3) == 0) {
                    node = NULL;
                    while ((node = IterateList(list, node, 3)) != NULL) {
                        /*
                         * If object does not exist in source or .cpignore
                         * then recursively remove it.
                         */
                        char *ndpath;

                        ndpath = mprintf("%s/%s", dpath, node->no_Name);
                        RemoveRecur(ndpath, ddevNo, node->no_Stat);
                        free(ndpath);
                    }
                }
            }
            ResetList(list);
            free(list);
        }

        if (dpath && st2Valid) {
            struct timeval tv[2];

            if (ForceOpt || !OwnerMatch(stat1, &st2))
                hc_chown(&DstHost, dpath, stat1->st_uid, stat1->st_gid);
            if (stat1->st_mode != st2.st_mode)
                hc_chmod(&DstHost, dpath, stat1->st_mode);
#ifdef _ST_FLAGS_PRESENT_
            if (!FlagsMatch(stat1, &st2))
                hc_chflags(&DstHost, dpath, stat1->st_flags);
#endif
            if (ForceOpt || mtimecmp(stat1, &st2) != 0) {
                bzero(tv, sizeof(tv));
                tv[0].tv_sec = stat1->st_mtime;
                tv[1].tv_sec = stat1->st_mtime;
#if defined(st_mtime)  /* A macro, so very likely on modern POSIX */
                tv[0].tv_usec = stat1->st_mtim.tv_nsec / 1000;
                tv[1].tv_usec = stat1->st_mtim.tv_nsec / 1000;
#endif
                hc_utimes(&DstHost, dpath, tv);
            }
        }
    } else if (dpath == NULL) {
        /*
         * If dpath is NULL, we are just updating the MD5
         */
#ifndef NOMD5
        if (UseMD5Opt && S_ISREG(stat1->st_mode)) {
            mres = md5_check(spath, NULL);

            if (VerboseOpt > 1) {
                if (mres < 0)
                    logstd("%-32s md5-update\n", (dpath) ? dpath : spath);
                else
                    logstd("%-32s md5-ok\n", (dpath) ? dpath : spath);
            } else if (!QuietOpt && mres < 0) {
                logstd("%-32s md5-update\n", (dpath) ? dpath : spath);
            }
        }
#endif
    } else if (S_ISREG(stat1->st_mode)) {
        char *path;
        char *hpath;
        int fd1;
        int fd2;

        if (st2Valid)
                path = mprintf("%s.tmp%d", dpath, (int)getpid());
        else
                path = mprintf("%s", dpath);

        /*
         * Handle check failure message.
         */
#ifndef NOMD5
        if (mres < 0)
            logerr("%-32s md5-CHECK-FAILED\n", (dpath) ? dpath : spath);
#endif

        /*
         * Not quite ready to do the copy yet.  If UseHLPath is defined,
         * see if we can hardlink instead.
         *
         * If we can hardlink, and the target exists, we have to remove it
         * first or the hardlink will fail.  This can occur in a number of
         * situations but most typically when the '-f -H' combination is
         * used.
         */
        if (UseHLPath && (hpath = checkHLPath(stat1, spath, dpath)) != NULL) {
                if (st2Valid)
                        xremove(&DstHost, dpath);
                if (hc_link(&DstHost, hpath, dpath) == 0) {
                        ++CountLinkedItems;
                        if (VerboseOpt) {
                            logstd("%-32s hardlinked(-H)\n",
                                   (dpath ? dpath : spath));
                        }
                        free(hpath);
                        goto skip_copy;
                }
                /*
                 * Shucks, we may have hit a filesystem hard linking limit,
                 * we have to copy instead.
                 */
                free(hpath);
        }

        if ((fd1 = hc_open(&SrcHost, spath, O_RDONLY, 0)) >= 0) {
            if ((fd2 = hc_open(&DstHost, path, O_WRONLY|O_CREAT|O_EXCL, 0600)) < 0) {
                /*
                 * There could be a .tmp file from a previously interrupted
                 * run, delete and retry.  Fail if we still can't get at it.
                 */
#ifdef _ST_FLAGS_PRESENT_
                hc_chflags(&DstHost, path, 0);
#endif
                hc_remove(&DstHost, path);
                fd2 = hc_open(&DstHost, path, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
            }
            if (fd2 >= 0) {
                const char *op;
                char *iobuf1 = malloc(GETIOSIZE);
                int n;

                /*
                 * Matt: What about holes?
                 */
                op = "read";
                while ((n = hc_read(&SrcHost, fd1, iobuf1, GETIOSIZE)) > 0) {
                    op = "write";
                    if (hc_write(&DstHost, fd2, iobuf1, n) != n)
                        break;
                    op = "read";
                }
                hc_close(&DstHost, fd2);
                if (n == 0) {
                    struct timeval tv[2];

                    bzero(tv, sizeof(tv));
                    tv[0].tv_sec = stat1->st_mtime;
                    tv[1].tv_sec = stat1->st_mtime;
#if defined(st_mtime)
                    tv[0].tv_usec = stat1->st_mtim.tv_nsec / 1000;
                    tv[1].tv_usec = stat1->st_mtim.tv_nsec / 1000;
#endif

                    if (DstRootPrivs || ChgrpAllowed(stat1->st_gid))
                        hc_chown(&DstHost, path, stat1->st_uid, stat1->st_gid);
                    hc_chmod(&DstHost, path, stat1->st_mode);
#ifdef _ST_FLAGS_PRESENT_
                    if (stat1->st_flags & (UF_IMMUTABLE|SF_IMMUTABLE))
                        hc_utimes(&DstHost, path, tv);
#else
                    hc_utimes(&DstHost, path, tv);
#endif
                    if (st2Valid && xrename(path, dpath, st2_flags) != 0) {
                        logerr("%-32s rename-after-copy failed: %s\n",
                            (dpath ? dpath : spath), strerror(errno)
                        );
                        xremove(&DstHost, path);
                        ++r;
                    } else {
                        if (VerboseOpt)
                            logstd("%-32s copy-ok\n", (dpath ? dpath : spath));
#ifdef _ST_FLAGS_PRESENT_
                        if (DstRootPrivs ? stat1->st_flags : stat1->st_flags & UF_SETTABLE)
                            hc_chflags(&DstHost, dpath, stat1->st_flags);
#endif
                    }
#ifdef _ST_FLAGS_PRESENT_
                    if ((stat1->st_flags & (UF_IMMUTABLE|SF_IMMUTABLE)) == 0)
                        hc_utimes(&DstHost, dpath, tv);
#endif
                    CountSourceReadBytes += size;
                    CountWriteBytes += size;
                    CountSourceBytes += size;
                    CountSourceItems++;
                    CountCopiedItems++;
                } else {
                    logerr("%-32s %s failed: %s\n",
                        (dpath ? dpath : spath), op, strerror(errno)
                    );
                    hc_remove(&DstHost, path);
                    ++r;
                }
                free(iobuf1);
            } else {
                logerr("%-32s create (uid %d, euid %d) failed: %s\n",
                    (dpath ? dpath : spath), getuid(), geteuid(),
                    strerror(errno)
                );
                ++r;
            }
            hc_close(&SrcHost, fd1);
        } else {
            logerr("%-32s copy: open failed: %s\n",
                (dpath ? dpath : spath),
                strerror(errno)
            );
            ++r;
        }
skip_copy:
        free(path);

        if (hln) {
            if (!r && hc_stat(&DstHost, dpath, &st2) == 0) {
                hltsetdino(hln, st2.st_ino);
            } else {
                hltdelete(hln);
                hln = NULL;
            }
        }
    } else if (S_ISLNK(stat1->st_mode)) {
        char *link1 = malloc(GETLINKSIZE);
        char *link2 = malloc(GETLINKSIZE);
        char *path;
        int n1;
        int n2;

        n1 = hc_readlink(&SrcHost, spath, link1, GETLINKSIZE - 1);
        if (st2Valid) {
                path = mprintf("%s.tmp%d", dpath, (int)getpid());
                n2 = hc_readlink(&DstHost, dpath, link2, GETLINKSIZE - 1);
        } else {
                path = mprintf("%s", dpath);
                n2 = -1;
        }
        if (n1 >= 0) {
            if (ForceOpt || n1 != n2 || bcmp(link1, link2, n1) != 0 ||
                (st2Valid && symlink_mfo_test(&DstHost, stat1, &st2))
            ) {
                struct timeval tv[2];

                bzero(tv, sizeof(tv));
                tv[0].tv_sec = stat1->st_mtime;
                tv[1].tv_sec = stat1->st_mtime;
#if defined(st_mtime)
                tv[0].tv_usec = stat1->st_mtim.tv_nsec / 1000;
                tv[1].tv_usec = stat1->st_mtim.tv_nsec / 1000;
#endif

                hc_umask(&DstHost, ~stat1->st_mode);
                xremove(&DstHost, path);
                link1[n1] = 0;
                if (hc_symlink(&DstHost, link1, path) < 0) {
                      logerr("%-32s symlink (%s->%s) failed: %s\n",
                          (dpath ? dpath : spath), link1, path,
                          strerror(errno)
                      );
                      ++r;
                } else {
                    if (DstRootPrivs || ChgrpAllowed(stat1->st_gid))
                        hc_lchown(&DstHost, path, stat1->st_uid, stat1->st_gid);

                    /*
                     * lutimes, lchmod if supported by destination.
                     */
                    if (DstHost.version >= HCPROTO_VERSION_LUCC) {
                        hc_lchmod(&DstHost, path, stat1->st_mode);
                        hc_lutimes(&DstHost, path, tv);
                    }

                    /*
                     * rename (and set flags if supported by destination)
                     */
                    if (st2Valid && xrename(path, dpath, st2_flags) != 0) {
                        logerr("%-32s rename softlink (%s->%s) failed: %s\n",
                            (dpath ? dpath : spath),
                            path, dpath, strerror(errno));
                        xremove(&DstHost, path);
                    } else {
#ifdef _ST_FLAGS_PRESENT_
                        if (DstHost.version >= HCPROTO_VERSION_LUCC)
                            hc_lchflags(&DstHost, dpath, stat1->st_flags);
#endif
                        if (VerboseOpt) {
                            logstd("%-32s softlink-ok\n",
                                   (dpath ? dpath : spath));
                        }
                    }
                    hc_umask(&DstHost, 000);
                    CountWriteBytes += n1;
                    CountCopiedItems++;
                }
            } else {
                if (VerboseOpt >= 3)
                    logstd("%-32s nochange", (dpath ? dpath : spath));
                if (!OwnerMatch(stat1, &st2)) {
                    hc_lchown(&DstHost, dpath, stat1->st_uid, stat1->st_gid);
                    if (VerboseOpt >= 3)
                        logstd(" (uid/gid differ)");
                }
                if (VerboseOpt >= 3)
                    logstd("\n");
            }
            CountSourceBytes += n1;
            CountSourceReadBytes += n1;
            if (n2 > 0)
                CountTargetReadBytes += n2;
            CountSourceItems++;
        } else {
            r = 1;
            logerr("%-32s softlink-failed\n", (dpath ? dpath : spath));
        }
        free(link1);
        free(link2);
        free(path);
    } else if ((S_ISCHR(stat1->st_mode) || S_ISBLK(stat1->st_mode)) && DeviceOpt) {
        char *path = NULL;

        if (ForceOpt ||
            st2Valid == 0 ||
            stat1->st_mode != st2.st_mode ||
            stat1->st_rdev != st2.st_rdev ||
            !OwnerMatch(stat1, &st2)
        ) {
            if (st2Valid) {
                path = mprintf("%s.tmp%d", dpath, (int)getpid());
                xremove(&DstHost, path);
            } else {
                path = mprintf("%s", dpath);
            }

            if (hc_mknod(&DstHost, path, stat1->st_mode, stat1->st_rdev) == 0) {
                hc_chmod(&DstHost, path, stat1->st_mode);
                hc_chown(&DstHost, path, stat1->st_uid, stat1->st_gid);
                if (st2Valid)
                        xremove(&DstHost, dpath);
                if (st2Valid && xrename(path, dpath, st2_flags) != 0) {
                    logerr("%-32s dev-rename-after-create failed: %s\n",
                        (dpath ? dpath : spath),
                        strerror(errno)
                    );
                } else if (VerboseOpt) {
                    logstd("%-32s dev-ok\n", (dpath ? dpath : spath));
                }
                CountCopiedItems++;
            } else {
                r = 1;
                logerr("%-32s dev failed: %s\n",
                    (dpath ? dpath : spath), strerror(errno)
                );
            }
        } else {
            if (VerboseOpt >= 3)
                logstd("%-32s nochange\n", (dpath ? dpath : spath));
        }
        if (path)
                free(path);
        CountSourceItems++;
    }
done:
    if (hln) {
        if (hln->dino == (ino_t)-1) {
            hltdelete(hln);
            /*hln = NULL; unneeded */
        } else {
            hltrels(hln);
        }
    }
    return (r);
}

int
ScanDir(List *list, struct HostConf *host, const char *path,
        int64_t *CountReadBytes, int n)
{
    DIR *dir;
    struct HostConf *cphost;
    struct HCDirEntry *den;
    struct stat *statptr;

    if (n == 0) {
        /*
         * scan .cpignore file for files/directories to ignore
         * (only in the source directory, i.e. if n == 0).
         */
        if (UseCpFile) {
            int fd;
            int nread;
            int bufused;
            char *buf = malloc(GETBUFSIZE);
            char *nl, *next;
            char *fpath;

            if (UseCpFile[0] == '/') {
                fpath = mprintf("%s", UseCpFile);
                cphost = NULL;
            } else {
                fpath = mprintf("%s/%s", path, UseCpFile);
                AddList(list, strrchr(fpath, '/') + 1, 1, NULL);
                cphost = host;
            }
            fd = hc_open(cphost, fpath, O_RDONLY, 0);
            if (fd >= 0) {
                bufused = 0;
                while ((nread = hc_read(cphost, fd, buf + bufused,
                        GETBUFSIZE - bufused - 1)) > 0) {
                    *CountReadBytes += nread;
                    bufused += nread;
                    buf[bufused] = 0;
                    for (next = buf; (nl = strchr(next, '\n')); next = nl+1) {
                        *nl = 0;
                        AddList(list, next, 1, NULL);
                    }
                    bufused = strlen(next);
                    if (bufused)
                        bcopy(next, buf, bufused);
                }
                if (bufused) {
                    /* last line has no trailing newline */
                    buf[bufused] = 0;
                    AddList(list, buf, 1, NULL);
                }
                hc_close(cphost, fd);
            }
            free(fpath);
            free(buf);
        }

        /*
         * Automatically exclude MD5CacheFile that we create on the
         * source from the copy to the destination.
         */
        if (UseMD5Opt)
            AddList(list, MD5CacheFile, 1, NULL);
    }

    if ((dir = hc_opendir(host, path)) == NULL)
        return (1);
    while ((den = hc_readdir(host, dir, &statptr)) != NULL) {
        /*
         * ignore . and ..
         */
        if (strcmp(den->d_name, ".") != 0 && strcmp(den->d_name, "..") != 0) {
             if (UseCpFile && UseCpFile[0] == '/') {
                 if (CheckList(list, path, den->d_name) == 0)
                        continue;
             }
             AddList(list, den->d_name, n, statptr);
        }
    }
    hc_closedir(host, dir);

    return (0);
}

/*
 * RemoveRecur()
 */

static void
RemoveRecur(const char *dpath, dev_t devNo, struct stat *dstat)
{
    struct stat st;

    if (dstat == NULL) {
        if (hc_lstat(&DstHost, dpath, &st) == 0)
            dstat = &st;
    }
    if (dstat != NULL) {
        if (devNo == (dev_t)-1)
            devNo = dstat->st_dev;
        if (dstat->st_dev == devNo) {
            if (S_ISDIR(dstat->st_mode)) {
                DIR *dir;

                if ((dir = hc_opendir(&DstHost, dpath)) != NULL) {
                    List *list = malloc(sizeof(List));
                    Node *node = NULL;
                    struct HCDirEntry *den;

                    InitList(list);
                    while ((den = hc_readdir(&DstHost, dir, &dstat)) != NULL) {
                        if (strcmp(den->d_name, ".") == 0)
                            continue;
                        if (strcmp(den->d_name, "..") == 0)
                            continue;
                        AddList(list, den->d_name, 3, dstat);
                    }
                    hc_closedir(&DstHost, dir);
                    while ((node = IterateList(list, node, 3)) != NULL) {
                        char *ndpath;

                        ndpath = mprintf("%s/%s", dpath, node->no_Name);
                        RemoveRecur(ndpath, devNo, node->no_Stat);
                        free(ndpath);
                    }
                    ResetList(list);
                    free(list);
                }
                if (AskConfirmation && NoRemoveOpt == 0) {
                    if (YesNo(dpath)) {
                        if (xrmdir(&DstHost, dpath) < 0) {
                            logerr("%-32s rmdir failed: %s\n",
                                dpath, strerror(errno)
                            );
                        }
                        CountRemovedItems++;
                    }
                } else {
                    if (NoRemoveOpt) {
                        if (VerboseOpt)
                            logstd("%-32s not-removed\n", dpath);
                    } else if (xrmdir(&DstHost, dpath) == 0) {
                        if (VerboseOpt)
                            logstd("%-32s rmdir-ok\n", dpath);
                        CountRemovedItems++;
                    } else {
                        logerr("%-32s rmdir failed: %s\n",
                            dpath, strerror(errno)
                        );
                    }
                }
            } else {
                if (AskConfirmation && NoRemoveOpt == 0) {
                    if (YesNo(dpath)) {
                        if (xremove(&DstHost, dpath) < 0) {
                            logerr("%-32s remove failed: %s\n",
                                dpath, strerror(errno)
                            );
                        }
                        CountRemovedItems++;
                    }
                } else {
                    if (NoRemoveOpt) {
                        if (VerboseOpt)
                            logstd("%-32s not-removed\n", dpath);
                    } else if (xremove(&DstHost, dpath) == 0) {
                        if (VerboseOpt)
                            logstd("%-32s remove-ok\n", dpath);
                        CountRemovedItems++;
                    } else {
                        logerr("%-32s remove failed: %s\n",
                            dpath, strerror(errno)
                        );
                    }
                }
            }
        }
    }
}

static void
InitList(List *list)
{
    bzero(list, sizeof(List));
    list->li_Node.no_Next = &list->li_Node;
}

static void
ResetList(List *list)
{
    Node *node;

    while ((node = list->li_Node.no_Next) != &list->li_Node) {
        list->li_Node.no_Next = node->no_Next;
        if (node->no_Stat != NULL)
            free(node->no_Stat);
        free(node);
    }
    InitList(list);
}

static Node *
IterateList(List *list, Node *node, int n)
{
    if (node == NULL)
        node = list->li_Node.no_Next;
    else
        node = node->no_Next;
    while (node->no_Value != n && node != &list->li_Node)
        node = node->no_Next;
    return (node == &list->li_Node ? NULL : node);
}

static int
AddList(List *list, const char *name, int n, struct stat *st)
{
    Node *node;
    int hv;

    /*
     * Scan against wildcards.  Only a node value of 1 can be a wildcard
     * ( usually scanned from .cpignore )
     */
    for (node = list->li_Hash[0]; node; node = node->no_HNext) {
        if (strcmp(name, node->no_Name) == 0 ||
            (n != 1 && node->no_Value == 1 &&
            fnmatch(node->no_Name, name, 0) == 0)
        ) {
            return(node->no_Value);
        }
    }

    /*
     * Look for exact match
     */

    hv = shash(name);
    for (node = list->li_Hash[hv]; node; node = node->no_HNext) {
        if (strcmp(name, node->no_Name) == 0) {
            return(node->no_Value);
        }
    }
    node = malloc(sizeof(Node) + strlen(name) + 1);
    if (node == NULL)
        fatal("out of memory");

    node->no_Next = list->li_Node.no_Next;
    list->li_Node.no_Next = node;

    node->no_HNext = list->li_Hash[hv];
    list->li_Hash[hv] = node;

    strcpy(node->no_Name, name);
    node->no_Value = n;
    node->no_Stat = st;

    return(n);
}

/*
 * Match against n=1 (cpignore) entries
 *
 * Returns 0 on match, non-zero if no match
 */
static int
CheckList(List *list, const char *path, const char *name)
{
    char *fpath = NULL;
    Node *node;
    int hv;

    if (asprintf(&fpath, "%s/%s", path, name) < 0)
        fatal("out of memory");

    /*
     * Scan against wildcards.  Only a node value of 1 can be a wildcard
     * ( usually scanned from .cpignore )
     */
    for (node = list->li_Hash[0]; node; node = node->no_HNext) {
        if (node->no_Value != 1)
                continue;
        if (fnmatch(node->no_Name, fpath, 0) == 0) {
                free(fpath);
                return 0;
        }
    }

    /*
     * Look for exact match
     */
    hv = shash(fpath);
    for (node = list->li_Hash[hv]; node; node = node->no_HNext) {
        if (node->no_Value != 1)
                continue;
        if (strcmp(fpath, node->no_Name) == 0) {
                free(fpath);
                return 0;
        }
    }

    free(fpath);
    return 1;
}

static int
shash(const char *s)
{
    int hv;

    hv = 0xA4FB3255;

    while (*s) {
        if (*s == '*' || *s == '?' ||
            *s == '{' || *s == '}' ||
            *s == '[' || *s == ']' ||
            *s == '|'
        ) {
            return(0);
        }
        hv = (hv << 5) ^ *s ^ (hv >> 23);
        ++s;
    }
    return(((hv >> 16) ^ hv) & HMASK);
}

static int
YesNo(const char *path)
{
    int ch, first;

    fprintf(stderr, "remove %s (Yes/No) [No]? ", path);
    fflush(stderr);

    first = ch = getchar();
    while (ch != '\n' && ch != EOF)
        ch = getchar();
    return ((first == 'y' || first == 'Y'));
}

/*
 * xrename() - rename with override
 *
 *      If the rename fails, attempt to override st_flags on the
 *      destination and rename again.  If that fails too, try to
 *      set the flags back the way they were and give up.
 */

static int
xrename(const char *src, const char *dst, u_long flags)
{
    int r;

    if ((r = hc_rename(&DstHost, src, dst)) < 0) {
#ifdef _ST_FLAGS_PRESENT_
        if (DstHost.version >= HCPROTO_VERSION_LUCC)
            hc_lchflags(&DstHost, dst, 0);
        else
            hc_chflags(&DstHost, dst, 0);

        if ((r = hc_rename(&DstHost, src, dst)) < 0) {
            if (DstHost.version >= HCPROTO_VERSION_LUCC)
                hc_lchflags(&DstHost, dst, flags);
            else
                hc_chflags(&DstHost, dst, flags);
        }
#endif
    }
    return(r);
}

static int
xlink(const char *src, const char *dst, u_long flags)
{
    int r;
#ifdef _ST_FLAGS_PRESENT_
    int e;
#endif

    if ((r = hc_link(&DstHost, src, dst)) < 0) {
#ifdef _ST_FLAGS_PRESENT_
        if (DstHost.version >= HCPROTO_VERSION_LUCC)
            hc_lchflags(&DstHost, src, 0);
        else
            hc_chflags(&DstHost, src, 0);
        r = hc_link(&DstHost, src, dst);
        e = errno;
        hc_chflags(&DstHost, src, flags);
        errno = e;
#endif
    }
    if (r == 0)
            ++CountLinkedItems;
    return(r);
}

static int
xremove(struct HostConf *host, const char *path)
{
    int res;

    res = hc_remove(host, path);
#ifdef _ST_FLAGS_PRESENT_
    if (res == -EPERM) {
        if (host->version >= HCPROTO_VERSION_LUCC)
            hc_lchflags(host, path, 0);
        else
            hc_chflags(host, path, 0);
        res = hc_remove(host, path);
    }
#endif
    return(res);
}

static int
xrmdir(struct HostConf *host, const char *path)
{
    int res;

    res = hc_rmdir(host, path);
#ifdef _ST_FLAGS_PRESENT_
    if (res == -EPERM) {
        hc_chflags(host, path, 0);
        res = hc_rmdir(host, path);
    }
#endif
    return(res);
}

/*
 * Compare mtimes.  By default cpdup only compares the seconds field
 * because different operating systems and filesystems will store time
 * fields with varying amounts of precision.
 *
 * This subroutine can be adjusted to also compare to microseconds or
 * nanoseconds precision.  However, since cpdup() uses utimes() to
 * set a file's timestamp and utimes() only takes timeval's (usec precision),
 * I strongly recommend only comparing down to usec precision at best.
 */
static int
mtimecmp(struct stat *st1, struct stat *st2)
{
    if (st1->st_mtime < st2->st_mtime)
        return -1;
    if (st1->st_mtime == st2->st_mtime)
        return 0;
    return 1;
}

/*
 * Check to determine if a symlink's mtime, flags, or mode differ.
 *
 * This is only supported on targets that support lchflags, lutimes,
 * and lchmod.
 */
static int
symlink_mfo_test(struct HostConf *hc, struct stat *st1, struct stat *st2)
{
    int res = 0;

    if (hc->version >= HCPROTO_VERSION_LUCC) {
        if (!FlagsMatch(st1, st2))
            res = 1;
        if (mtimecmp(st1, st2) != 0)
            res = 1;
        if (st1->st_mode != st2->st_mode)
            res = 1;
    }
    return res;
}