#!/usr/bin/python3
#  Copyright (c) 2016-2023 David Anderson.
#  All rights reserved.
#
#  Redistribution and use in source and binary forms, with or without
#  modification, are permitted provided that the following conditions are met:
#  * Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#  * 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.
#  * Neither the name of the example 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 David Anderson ''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 David Anderson 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.

import os
import sys
from datetime import datetime

# Happens to be the usual location of bugxml
# so the import works.
path="/home/davea/dwarf/code/bugxml"
mytz="PST"

sys.path.append(os.path.abspath(path))
import bugrecord


def ignore_this_line(d, inrecord):
    if len(d) < 1:
        if inrecord == "y":
            return "n"
        else:
            return "y"
    s = str(d)
    if s[0] == "#":
        return "y"
    return "n"


def closeouttext(bugrec, intext, text, linecount):
    if intext == "d":
        bugrec.setdescription(text)
        return
    elif intext == "v":
        bugrec.setvulnerability(text)
        return
    elif intext == "r":
        bugrec.setreferences(text)
        return
    if intext == "":
        return
    print("bogus closeout line at line ", linecount)
    sys.exit(1)


def readbugs(iname):
    name = iname
    if len(name) == 0:
        name = "/home/davea/dwarf/code/bugxml/data.txt"
    try:
        file = open(name, "r")
    except IOError as message:
        print("failed to open ", name, message)

    inrecord = "n"
    linecount = 0
    text = []
    usedid = {}
    intext = ""
    bugrec = ""
    buglist = []
    while 1:
        try:
            rec = file.readline()
        except EOFError:
            break
        if len(rec) < 1:
            # eof
            break
        linecount += 1
        if ignore_this_line(rec, inrecord) == "y":
            continue
        rec = rec.rstrip()
        if inrecord == "n":
            if len(rec) == 0:
                continue
            if rec.find(":") == -1:
                print("bogus non-blank line at line ", linecount)
                sys.exit(1)
        if inrecord == "y" and len(rec) > 0:
            # A multi line entry may have ":" in it.
            if intext != "" and rec[0] == " ":
                s3 = "".join(rec)
                text += [s3]
                continue
        low = rec.find(":")
        fldname = rec[0 : low + 1]
        fldval = rec[low + 1 :]
        if fldname == "id:":
            if inrecord == "y":
                print("bogus id: at line ", linecount)
                sys.exit(1)
            inrecord = "y"
            f = fldval.strip()
            if f in usedid:
                print("Duplicate Key:", f, "Giving up.")
                sys.exit(1)
            usedid[f] = 1
            s4 = "".join(fldval)
            bugrec = bugrecord.bugrecord(s4)
        elif fldname == "cve:":
            closeouttext(bugrec, intext, text, linecount),
            intext = ""
            text = []
            s4 = "".join(fldval)
            bugrec.setcve(s4)
        elif fldname == "fuzzer:":
            closeouttext(bugrec, intext, text, linecount),
            intext = ""
            text = []
            s4 = "".join(fldval)
            bugrec.setfuzzer(s4)
        elif fldname == "datereported:":
            closeouttext(bugrec, intext, text, linecount),
            intext = ""
            text = []
            s4 = "".join(fldval)
            bugrec.setdatereported(s4)
        elif fldname == "reportedby:":
            closeouttext(bugrec, intext, text, linecount),
            intext = ""
            text = []
            s4 = "".join(fldval)
            bugrec.setreportedby(s4)
        elif fldname == "vulnerability:":
            closeouttext(bugrec, intext, text, linecount),
            intext = "v"
            text = []
            if len(fldval) > 0:
                s4 = "".join(fldval)
                text = [s4]

        elif fldname == "product:":
            closeouttext(bugrec, intext, text, linecount),
            intext = ""
            text = []
            s4 = "".join(fldval)
            bugrec.setproduct(s4)
        elif fldname == "description:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            intext = "d"
            if len(fldval) > 0:
                s4 = "".join(fldval)
                text = [s4]

        elif fldname == "datefixed:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            intext = ""
            s4 = "".join(fldval)
            bugrec.setdatefixed(s4)
        elif fldname == "references:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            intext = "r"
            if len(fldval) > 0:
                s4 = "".join(fldval)
                text = [s4]
        elif fldname == "gitfixid:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            intext = ""
            s4 = "".join(fldval)
            bugrec.setgitfixid(s4)
        elif fldname == "tarrelease:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            intext = ""
            s4 = "".join(fldval)
            bugrec.settarrelease(s4)
        elif fldname == "endrec:":
            closeouttext(bugrec, intext, text, linecount),
            text = []
            if inrecord == "n":
                print("bogus endrec: at line ", linecount)
                sys.exit(1)
            buglist += [bugrec]
            inrecord = "n"
            text = []
            intext = ""
            inrecord = "n"
    file.close()
    return buglist


def sort_by_id(myl):
    """Sort the list of objects by name."""
    auxiliary = [(x._id, x) for x in myl]
    auxiliary.sort()
    return [x[1] for x in auxiliary]


def write_line(file, l):
    file.write(l + "\n")


def write_all_lines(file, txt):
    for t in txt:
        write_line(file, t)

headtext = [
'<!DOCTYPE html>',
'<html lang="en">',
'<head>',
' <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" >',
'<title>Libdwarf Vulnerabilities</title>',
'  <META NAME="description" CONTENT="Libdwarf Vulnerabilities">',
'  <META NAME="keywords" CONTENT="DWARF, DWARF2, DWARF3, DWARF4,DWARF5">',
'</head>',
'</body>',
'<h1 id=top>Libdwarf Vulnerabilities</h1>',
'<p>',
'This page provides',
'documentation of known vulnerabilities',
'in libdwarf.',
'We are concerned here with',
'cases where corrupt (by accident or intention)',
'DWARF can cause the library to get',
'a fault (crash) which',
'could expose the calling program',
'to interception by malefactors.',
'Dates (where known) are in ISO extended date format.',
'</p>',
'<p>',
'Some of the bugs reported here have a CVE assigned,',
'for example CVE-2017-9052.',
'These are reported on cve.org (or possibly the earlier',
'cve.mitre.org).',
'Search with "libdwarf" on cve.org for a list.',
'</p>',
'<p>',
'Git reference path names refer to object files',
'in the libdwarf regression test base.',
'The test files can be retrieved via anonymous access:',
'<br>',
'"git clone https://github.org/davea42/libdwarf-regressiontests"',
'</p>',
'<p>',
'A few bugs refer to https://bugzilla.redhat.com',
'bug system entries',
'and/or https://bugs.chromium.org',
'in addition to showing the names of test files in',
'the regression test base.',
'</p>',
'<H2 id=vulnerabilities>Vulnerabilities</H2>',
'<p>',
'Vulnerabilities <a href="./dwarfbug.html">listed newest-first</a>.',
'<br>',
'Vulnerabilities <a href="./dwarfbuglohi.html">listed oldest-first</a>.',
'</p>',
 ]

def writeheader(file,headname):
    dt = datetime.today()
    for l in headtext:
        write_line(file,l)
    hl='<H2>%s</H2>'%(headname)
    write_line(file,hl)
    #tm='</p>as of %s %s</p>'%(dt.strftime("%Y-%m-%d %H:%M "),mytz)
    tm='</p>as of %s</p>'%(dt.strftime("%B %Y"))
    write_line(file,tm)

def generatehtml(list2,headname, name):
    try:
        file = open(name, "w")
    except IOError as message:
        print("failed to open ", name, message)
        sys.exit(1)
    writeheader(file,headname)
    write_line(file,"<p> Record count: %d </p>"%(len(list2)))
    for i,b in enumerate(list2):
        num = int(i) +1
        txt = b.generate_html(num)
        write_all_lines(file, txt)
    write_line(file,'<p> <a href="#top">[top]</a> </p>')
    write_line(file, "</body>")
    write_line(file, "</html>")
    file.close()


def generatexml(list2, name):
    try:
        file = open(name, "w")
    except IOError as message:
        print("failed to open ", name, message)
        sys.exit(1)
    t = '<?xml version="1.0" encoding="us-ascii"?>'
    write_line(file, t)
    write_line(file, "<dwarfbug>")
    for b in list2:
        txt = b.generate_xml()
        write_all_lines(file, txt)
    write_line(file, "</dwarfbug>")
    file.close()


if __name__ == "__main__":
    list = readbugs("")
    list2 = sort_by_id(list)
    list2.reverse()
    #for b in list2:
    #    b.printbug()

    targlo="LibDwarf Vulnerabilities Newest First"
    generatehtml(list2,targlo,"dwarfbug.html")
    generatexml(list2,"dwarfbug.xml")

    list2.reverse()
    targhi="LibDwarf Vulnerabilities Oldest First"
    generatehtml(list2,targhi,"dwarfbuglohi.html")