/*-
 * Copyright (c) 2003 Poul-Henning Kamp
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * This software was developed for the FreeBSD Project by Poul-Henning Kamp
 * and NAI Labs, the Security Research Division of Network Associates, Inc.
 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
 * DARPA CHATS research program.
 *
 * 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. The names of the authors may not be used to endorse or promote
 *    products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <paths.h>
#include <fcntl.h>
#include <err.h>
#include <bsdxml.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/mman.h>

struct sector {
        LIST_ENTRY(sector)      sectors;
        off_t                   offset;
        unsigned char           *data;
};

struct simdisk_softc {
        int                     sectorsize;
        off_t                   mediasize;
        off_t                   lastsector;
        LIST_HEAD(,sector)      sectors;
        struct sbuf             *sbuf;
        struct sector           *sp;
        u_int                   fwsectors;
        u_int                   fwheads;
        u_int                   fwcylinders;
};

static void
g_simdisk_insertsector(struct simdisk_softc *sc, struct sector *dsp)
{
        struct sector *dsp2, *dsp3;

        if (sc->lastsector < dsp->offset)
                sc->lastsector = dsp->offset;
        if (LIST_EMPTY(&sc->sectors)) {
                LIST_INSERT_HEAD(&sc->sectors, dsp, sectors);
                return;
        }
        dsp3 = NULL;
        LIST_FOREACH(dsp2, &sc->sectors, sectors) {
                dsp3 = dsp2;
                if (dsp2->offset > dsp->offset) {
                        LIST_INSERT_BEFORE(dsp2, dsp, sectors);
                        return;
                }
        }
        LIST_INSERT_AFTER(dsp3, dsp, sectors);
}

static void
startElement(void *userData, const char *name, const char **atts __unused)
{
        struct simdisk_softc *sc;

        sc = userData;
        if (!strcasecmp(name, "sector")) {
                sc->sp = calloc(1, sizeof(*sc->sp) + sc->sectorsize);
                sc->sp->data = (u_char *)(sc->sp + 1);
        }
        sbuf_clear(sc->sbuf);
}

static void
endElement(void *userData, const char *name)
{
        struct simdisk_softc *sc;
        char *p;
        u_char *q;
        int i, j;
        off_t o;

        sc = userData;

        if (!strcasecmp(name, "comment")) {
                sbuf_clear(sc->sbuf);
                return;
        }
        sbuf_finish(sc->sbuf);
        if (!strcasecmp(name, "sectorsize")) {
                sc->sectorsize = strtoul(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on sectorsize");
        } else if (!strcasecmp(name, "mediasize")) {
                o = strtoull(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on mediasize");
                if (o > 0)
                        sc->mediasize = o;
        } else if (!strcasecmp(name, "fwsectors")) {
                sc->fwsectors = strtoul(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on fwsectors");
        } else if (!strcasecmp(name, "fwheads")) {
                sc->fwheads = strtoul(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on fwheads");
        } else if (!strcasecmp(name, "fwcylinders")) {
                sc->fwcylinders = strtoul(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on fwcylinders");
        } else if (!strcasecmp(name, "offset")) {
                sc->sp->offset= strtoull(sbuf_data(sc->sbuf), &p, 0);
                if (*p != '\0')
                        errx(1, "strtoul croaked on offset");
        } else if (!strcasecmp(name, "fill")) {
                j = strtoul(sbuf_data(sc->sbuf), NULL, 16);
                memset(sc->sp->data, j, sc->sectorsize);
        } else if (!strcasecmp(name, "hexdata")) {
                q = sc->sp->data;
                p = sbuf_data(sc->sbuf);
                for (i = 0; i < sc->sectorsize; i++) {
                        if (!isxdigit(*p))
                                errx(1, "I croaked on hexdata %d:(%02x)", i, *p);
                        if (isdigit(*p))
                                j = (*p - '0') << 4;
                        else
                                j = (tolower(*p) - 'a' + 10) << 4;
                        p++;
                        if (!isxdigit(*p))
                                errx(1, "I croaked on hexdata %d:(%02x)", i, *p);
                        if (isdigit(*p))
                                j |= *p - '0';
                        else
                                j |= tolower(*p) - 'a' + 10;
                        p++;
                        *q++ = j;
                }
        } else if (!strcasecmp(name, "sector")) {
                g_simdisk_insertsector(sc, sc->sp);
                sc->sp = NULL;
        } else if (!strcasecmp(name, "diskimage")) {
        } else if (!strcasecmp(name, "FreeBSD")) {
        } else {
                printf("<%s>[[%s]]\n", name, sbuf_data(sc->sbuf));
        }
        sbuf_clear(sc->sbuf);
}

static void
characterData(void *userData, const XML_Char *s, int len)
{
        const char *b, *e;
        struct simdisk_softc *sc;

        sc = userData;
        b = s;
        e = s + len - 1;
        while (isspace(*b) && b < e)
                b++;
        while (isspace(*e) && e > b)
                e--;
        if (e != b || !isspace(*b))
                sbuf_bcat(sc->sbuf, b, e - b + 1);
}

static struct simdisk_softc *
g_simdisk_xml_load(const char *file)
{
        XML_Parser parser = XML_ParserCreate(NULL);
        struct stat st;
        char *p;
        struct simdisk_softc *sc;
        int fd, i;

        sc = calloc(1, sizeof *sc);
        sc->sbuf = sbuf_new_auto();
        LIST_INIT(&sc->sectors);
        XML_SetUserData(parser, sc);
        XML_SetElementHandler(parser, startElement, endElement);
        XML_SetCharacterDataHandler(parser, characterData);

        fd = open(file, O_RDONLY);
        if (fd < 0)
                err(1, "%s", file);
        fstat(fd, &st);
        p = mmap(NULL, st.st_size, PROT_READ, MAP_NOCORE|MAP_PRIVATE, fd, 0);
        i = XML_Parse(parser, p, st.st_size, 1);
        if (i != 1)
                errx(1, "XML_Parse complains: return %d", i);
        munmap(p, st.st_size);
        close(fd);
        XML_ParserFree(parser);
        return (sc);
}

int
main(int argc, char **argv)
{
        struct simdisk_softc *sc;
        char buf[BUFSIZ];
        int error, fd;
        struct sector *dsp;

        if (argc != 3)
                errx(1, "Usage: %s mddevice xmlfile", argv[0]);

        sc = g_simdisk_xml_load(argv[2]);
        if (sc->mediasize == 0)
                sc->mediasize = sc->lastsector + sc->sectorsize * 10;
        if (sc->sectorsize == 0)
                sc->sectorsize = 512;
        sprintf(buf, "mdconfig -a -t malloc -s %jd -S %d",
            (intmax_t)sc->mediasize / sc->sectorsize, sc->sectorsize);
        if (sc->fwsectors && sc->fwheads)
                sprintf(buf + strlen(buf), " -x %d -y %d",
                    sc->fwsectors, sc->fwheads);
        sprintf(buf + strlen(buf), " -u %s", argv[1]);
        error = system(buf);
        if (error)
                return (error);
        fd = open(argv[1], O_RDWR);
        if (fd < 0 && errno == ENOENT) {
                sprintf(buf, "%s%s", _PATH_DEV, argv[1]);
                fd = open(buf, O_RDWR);
        }
        if (fd < 0)
                err(1, "Could not open %s", argv[1]);
        LIST_FOREACH(dsp, &sc->sectors, sectors) {
                lseek(fd, dsp->offset, SEEK_SET);
                error = write(fd, dsp->data, sc->sectorsize);
                if (error != sc->sectorsize)
                        err(1, "write sectordata failed");
        }
        close(fd);
        exit (0);
}