/*
  zipcloak.c - Zip 3

  Copyright (c) 1990-2005 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2005-Feb-10 or later
  (the contents of which are also included in zip.h) for terms of use.
  If, for some reason, all these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/*
   This code was originally written in Europe and can be freely distributed
   from any country except the U.S.A. If this code is imported into the U.S.A,
   it cannot be re-exported from the U.S.A to another country. (This
   restriction might seem curious but this is what US law requires.)
 */
#define __ZIPCLOAK_C

#ifndef UTIL
#define UTIL
#endif
#include "zip.h"
#define DEFCPYRT        /* main module: enable copyright string defines! */
#include "revision.h"
#include "crypt.h"
#include "ttyio.h"
#include <signal.h>
#ifndef NO_STDLIB_H
#  include <stdlib.h>
#endif

#if CRYPT       /* defined (as TRUE or FALSE) in crypt.h */

int main OF((int argc, char **argv));

local void handler OF((int sig));
local void license OF((void));
local void help OF((void));
local void version_info OF((void));

/* Temporary zip file name and file pointer */
local char *tempzip;
local FILE *tempzf;

/* Pointer to CRC-32 table (used for decryption/encryption) */
#if (!defined(USE_ZLIB) || defined(USE_OWN_CRCTAB))
ZCONST ulg near *crc_32_tab;
#else
ZCONST uLongf *crc_32_tab;
#endif

/***********************************************************************
 * Issue a message for the error, clean up files and memory, and exit.
 */
void ziperr(code, msg)
    int code;               /* error code from the ZE_ class */
    ZCONST char *msg;       /* message about how it happened */
{
    if (PERR(code)) perror("zipcloak error");
    fprintf(stderr, "zipcloak error: %s (%s)\n", ziperrors[code-1], msg);
    if (tempzf != NULL) fclose(tempzf);
    if (tempzip != NULL) {
        destroy(tempzip);
        free((zvoid *)tempzip);
    }
    if (zipfile != NULL) free((zvoid *)zipfile);
    EXIT(code);
}

/***********************************************************************
 * Print a warning message to stderr and return.
 */
void zipwarn(msg1, msg2)
    ZCONST char *msg1, *msg2;   /* message strings juxtaposed in output */
{
    fprintf(stderr, "zipcloak warning: %s%s\n", msg1, msg2);
}


/***********************************************************************
 * Upon getting a user interrupt, turn echo back on for tty and abort
 * cleanly using ziperr().
 */
local void handler(sig)
    int sig;                  /* signal number (ignored) */
{
#if (!defined(MSDOS) && !defined(__human68k__) && !defined(RISCOS))
    echon();
    putc('\n', stderr);
#endif
    ziperr(ZE_ABORT +sig-sig, "aborting");
    /* dummy usage of sig to avoid compiler warnings */
}


static ZCONST char *public[] = {
"The encryption code of this program is not copyrighted and is",
"put in the public domain. It was originally written in Europe",
"and can be freely distributed in both source and object forms",
"from any country, including the USA under License Exception",
"TSU of the U.S. Export Administration Regulations (section",
"740.13(e)) of 6 June 2002.  (Prior to January 2000, re-export",
"from the US was a violation of US law.)"
};

/***********************************************************************
 * Print license information to stdout.
 */
local void license()
{
    extent i;             /* counter for copyright array */

    for (i = 0; i < sizeof(swlicense)/sizeof(char *); i++) {
        puts(swlicense[i]);
    }
    putchar('\n');
    printf("Export notice:\n");
    for (i = 0; i < sizeof(public)/sizeof(char *); i++) {
        puts(public[i]);
    }
}


static ZCONST char *help_info[] = {
"",
"ZipCloak %s (%s)",
#ifdef VM_CMS
"Usage:  zipcloak [-dq] [-b fm] zipfile",
#else
"Usage:  zipcloak [-dq] [-b path] zipfile",
#endif
"  the default action is to encrypt all unencrypted entries in the zip file",
"",
"  -d  --decrypt    decrypt encrypted entries (copy if given wrong password)",
#ifdef VM_CMS
"  -b  --temp-mode  use \"fm\" as the filemode for the temporary zip file",
#else
"  -b  --temp-path  use \"path\" for the temporary zip file",
#endif
"  -q  --quiet      quiet operation, suppress some informational messages",
"  -h  --help       show this help",
"  -v  --version    show version info",
"  -L  --license    show software license"
  };

/***********************************************************************
 * Print help (along with license info) to stdout.
 */
local void help()
{
    extent i;             /* counter for help array */

    for (i = 0; i < sizeof(help_info)/sizeof(char *); i++) {
        printf(help_info[i], VERSION, REVDATE);
        putchar('\n');
    }
}


local void version_info()
/* Print verbose info about program version and compile time options
   to stdout. */
{
  extent i;             /* counter in text arrays */

  /* Options info array */
  static ZCONST char *comp_opts[] = {
#ifdef DEBUG
    "DEBUG",
#endif
#if CRYPT && defined(PASSWD_FROM_STDIN)
    "PASSWD_FROM_STDIN",
#endif /* CRYPT && PASSWD_FROM_STDIN */
    NULL
  };

  for (i = 0; i < sizeof(copyright)/sizeof(char *); i++)
  {
    printf(copyright[i], "zipcloak");
    putchar('\n');
  }
  putchar('\n');

  for (i = 0; i < sizeof(versinfolines)/sizeof(char *); i++)
  {
    printf(versinfolines[i], "ZipCloak", VERSION, REVDATE);
    putchar('\n');
  }

  version_local();

  puts("ZipCloak special compilation options:");
  for (i = 0; (int)i < (int)(sizeof(comp_opts)/sizeof(char *) - 1); i++)
  {
    printf("\t%s\n",comp_opts[i]);
  }
  printf("\t[encryption, version %d.%d%s of %s]\n",
            CR_MAJORVER, CR_MINORVER, CR_BETA_VER, CR_VERSION_DATE);
}

/* options for zipcloak - 3/5/2004 EG */
struct option_struct options[] = {
  /* short longopt        value_type        negatable        ID    name */
#ifdef VM_CMS
    {"b",  "temp-mode",   o_REQUIRED_VALUE, o_NOT_NEGATABLE, 'b',  "temp file mode"},
#else
    {"b",  "temp-path",   o_REQUIRED_VALUE, o_NOT_NEGATABLE, 'b',  "path for temp file"},
#endif
    {"d",  "decrypt",     o_NO_VALUE,       o_NOT_NEGATABLE, 'd',  "decrypt"},
    {"h",  "help",        o_NO_VALUE,       o_NOT_NEGATABLE, 'h',  "help"},
    {"L",  "license",     o_NO_VALUE,       o_NOT_NEGATABLE, 'L',  "license"},
    {"l",  "license",     o_NO_VALUE,       o_NOT_NEGATABLE, 'L',  "license"},
    {"v",  "version",     o_NO_VALUE,       o_NOT_NEGATABLE, 'v',  "version"},
    /* the end of the list */
    {NULL, NULL,          o_NO_VALUE,       o_NOT_NEGATABLE, 0,    NULL} /* end has option_ID = 0 */
  };


/***********************************************************************
 * Encrypt or decrypt all of the entries in a zip file.  See the command
 * help in help() above.
 */

int main(argc, argv)
    int argc;                   /* number of tokens in command line */
    char **argv;                /* command line tokens */
{
    int attr;                   /* attributes of zip file */
    zoff_t start_offset;        /* start of central directory */
    int decrypt;                /* decryption flag */
    int temp_path;              /* 1 if next argument is path for temp files */
    char passwd[IZ_PWLEN+1];    /* password for encryption or decryption */
    char verify[IZ_PWLEN+1];    /* password for encryption or decryption */
    char *q;                    /* steps through option arguments */
    int r;                      /* arg counter */
    int res;                    /* result code */
    zoff_t length;              /* length of central directory */
    FILE *inzip, *outzip;       /* input and output zip files */
    struct zlist far *z;        /* steps through zfiles linked list */

#ifdef THEOS
    setlocale(LC_CTYPE, "I");
#endif

    /* If no args, show help */
    if (argc == 1) {
        help();
        EXIT(ZE_OK);
    }

    /* Informational messages are written to stdout. */
    mesg = stdout;

    init_upper();               /* build case map table */

    crc_32_tab = get_crc_table();
                                /* initialize crc table for crypt */

    /* Go through args */
    zipfile = tempzip = NULL;
    tempzf = NULL;
#ifdef SIGINT
    signal(SIGINT, handler);
#endif
#ifdef SIGTERM                  /* Some don't have SIGTERM */
    signal(SIGTERM, handler);
#endif
#ifdef SIGABRT
    signal(SIGABRT, handler);
#endif
#ifdef SIGBREAK
    signal(SIGBREAK, handler);
#endif
#ifdef SIGBUS
    signal(SIGBUS, handler);
#endif
#ifdef SIGILL
    signal(SIGILL, handler);
#endif
#ifdef SIGSEGV
    signal(SIGSEGV, handler);
#endif
    temp_path = decrypt = 0;
    for (r = 1; r < argc; r++) {
        if (*argv[r] == '-') {
            if (!argv[r][1]) ziperr(ZE_PARMS, "zip file cannot be stdin");
            for (q = argv[r]+1; *q; q++) {
                switch (*q) {
                case 'b':   /* Specify path for temporary file */
                    if (temp_path) {
                        ziperr(ZE_PARMS, "use -b before zip file name");
                    }
                    temp_path = 1;          /* Next non-option is path */
                    break;
                case 'd':
                    decrypt = 1;  break;
                case 'h':   /* Show help */
                    help();
                    EXIT(ZE_OK);
                case 'l': case 'L':  /* Show copyright and disclaimer */
                    license();
                    EXIT(ZE_OK);
                case 'q':   /* Quiet operation, suppress info messages */
                    noisy = 0;  break;
                case 'v':   /* Show version info */
                    version_info();
                    EXIT(ZE_OK);
                default:
                    ziperr(ZE_PARMS, "unknown option");
                } /* switch */
            } /* for */

        } else if (temp_path == 0) {
            if (zipfile != NULL) {
                ziperr(ZE_PARMS, "can only specify one zip file");

            } else if ((zipfile = ziptyp(argv[r])) == NULL) {
                ziperr(ZE_MEM, "was processing arguments");
            }
        } else {
            tempath = argv[r];
            temp_path = 0;
        } /* if */
    } /* for */

    if (zipfile == NULL) ziperr(ZE_PARMS, "need to specify zip file");

    /* Read zip file */
    if ((res = readzipfile()) != ZE_OK) ziperr(res, zipfile);
    if (zfiles == NULL) ziperr(ZE_NAME, zipfile);

    /* Check for something to do */
    for (z = zfiles; z != NULL; z = z->nxt) {
        if (decrypt ? z->flg & 1 : !(z->flg & 1)) break;
    }
    if (z == NULL) {
        ziperr(ZE_NONE, decrypt ? "no encrypted files"
                       : "all files encrypted already");
    }

    /* Before we get carried away, make sure zip file is writeable */
    if ((inzip = fopen(zipfile, "a")) == NULL) ziperr(ZE_CREAT, zipfile);
    fclose(inzip);
    attr = getfileattr(zipfile);

    /* Open output zip file for writing */
    if ((tempzf = outzip = fopen(tempzip = tempname(zipfile), FOPW)) == NULL) {
        ziperr(ZE_TEMP, tempzip);
    }

    /* Get password */
    if (getp("Enter password: ", passwd, IZ_PWLEN+1) == NULL)
        ziperr(ZE_PARMS,
               "stderr is not a tty (you may never see this message!)");

    if (decrypt == 0) {
        if (getp("Verify password: ", verify, IZ_PWLEN+1) == NULL)
               ziperr(ZE_PARMS,
                      "stderr is not a tty (you may never see this message!)");

        if (strcmp(passwd, verify))
               ziperr(ZE_PARMS, "password verification failed");

        if (*passwd == '\0')
               ziperr(ZE_PARMS, "zero length password not allowed");
    }

    /* Open input zip file again, copy preamble if any */
    if ((inzip = fopen(zipfile, FOPR)) == NULL) ziperr(ZE_NAME, zipfile);

    if (zipbeg && (res = fcopy(inzip, outzip, zipbeg)) != ZE_OK) {
        ziperr(res, res == ZE_TEMP ? tempzip : zipfile);
    }
    tempzn = zipbeg;

    /* Go through local entries, copying, encrypting, or decrypting */
    for (z = zfiles; z != NULL; z = z->nxt) {
        if (decrypt && (z->flg & 1)) {
            printf("decrypting: %s", z->zname);
            fflush(stdout);
            if ((res = zipbare(z, inzip, outzip, passwd)) != ZE_OK) {
                if (res != ZE_MISS) ziperr(res, "was decrypting an entry");
                printf(" (wrong password--just copying)");
            }
            putchar('\n');

        } else if ((!decrypt) && !(z->flg & 1)) {
            printf("encrypting: %s\n", z->zname);
            fflush(stdout);
            if ((res = zipcloak(z, inzip, outzip, passwd)) != ZE_OK) {
                ziperr(res, "was encrypting an entry");
            }
        } else {
            printf("   copying: %s\n", z->zname);
            fflush(stdout);
            if ((res = zipcopy(z, inzip, outzip)) != ZE_OK) {
                ziperr(res, "was copying an entry");
            }
        } /* if */
    } /* for */
    fclose(inzip);

    /* Write central directory and end of central directory */

    /* get start of central */
    if ((start_offset = zftello(outzip)) == (zoff_t)-1)
        ziperr(ZE_TEMP, tempzip);

    for (z = zfiles; z != NULL; z = z->nxt) {
        if ((res = putcentral(z, outzip)) != ZE_OK) ziperr(res, tempzip);
    }

    /* get end of central */
    if ((length = zftello(outzip)) == (zoff_t)-1)
        ziperr(ZE_TEMP, tempzip);

    length -= start_offset;               /* compute length of central */
    if ((res = putend((zoff_t)zcount, length, start_offset, zcomlen,
                      zcomment, outzip)) != ZE_OK) {
        ziperr(res, tempzip);
    }
    tempzf = NULL;
    if (fclose(outzip)) ziperr(ZE_TEMP, tempzip);
    if ((res = replace(zipfile, tempzip)) != ZE_OK) {
        zipwarn("new zip file left as: ", tempzip);
        free((zvoid *)tempzip);
        tempzip = NULL;
        ziperr(res, "was replacing the original zip file");
    }
    free((zvoid *)tempzip);
    tempzip = NULL;
    setfileattr(zipfile, attr);
#ifdef RISCOS
    /* Set the filetype of the zipfile to &DDC */
    setfiletype(zipfile, 0xDDC);
#endif
    free((zvoid *)zipfile);
    zipfile = NULL;

    /* Done! */
    RETURN(0);
}
#else /* !CRYPT */


/* below is only used if crpyt is not enabled */

/* keep compiler happy until implement long options - 11/4/2003 EG */
struct option_struct options[] = {
  /* short longopt        value_type        negatable        ID    name */
    {"h",  "help",        o_NO_VALUE,       o_NOT_NEGATABLE, 'h',  "help"},
    /* the end of the list */
    {NULL, NULL,          o_NO_VALUE,       o_NOT_NEGATABLE, 0,    NULL} /* end has option_ID = 0 */
  };


int main OF((void));

void zipwarn(msg1, msg2)
ZCONST char  *msg1, *msg2;
{
    /* Tell picky compilers to shut up about unused variables */
    msg1 = msg1; msg2 = msg2;
}

void ziperr(c, h)
int  c;
ZCONST char *h;
{
    /* Tell picky compilers to shut up about unused variables */
    c = c; h = h;
}

int main()
{
    fprintf(stderr, "\
This version of ZipCloak does not support encryption.  Get the current Zip\n\
source distribution and recompile ZipCloak after you have added an option to\n\
define the symbol USE_CRYPT to the C compiler's command arguments.\n");
    RETURN(1);
}

#endif /* ?CRYPT */
