apache-http-server/server/gen_test_char.c

/* ====================================================================
 * The Apache Software License, Version 1.1
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 *       "This product includes software developed by the
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 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software
 * originally written at the National Center for Supercomputing Applications,
 * University of Illinois, Urbana-Champaign.
 */

#include "apr.h"
#include "apr_lib.h"

#if APR_HAVE_STDIO_H
#include <stdio.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif

/* A bunch of functions in util.c scan strings looking for certain characters.
 * To make that more efficient we encode a lookup table.
 */
#define T_ESCAPE_SHELL_CMD    (0x01)
#define T_ESCAPE_PATH_SEGMENT (0x02)
#define T_OS_ESCAPE_PATH      (0x04)
#define T_HTTP_TOKEN_STOP     (0x08)

int main(int argc, char *argv[])
{
    unsigned c;
    unsigned char flags;

    printf("/* this file is automatically generated by gen_test_char, "
           "do not edit */\n"
           "#define T_ESCAPE_SHELL_CMD     (%u)\n"
           "#define T_ESCAPE_PATH_SEGMENT  (%u)\n"
           "#define T_OS_ESCAPE_PATH       (%u)\n"
           "#define T_HTTP_TOKEN_STOP      (%u)\n"
           "\n"
           "static const unsigned char test_char_table[256] = {\n"
           "    0,",
           T_ESCAPE_SHELL_CMD,
           T_ESCAPE_PATH_SEGMENT,
           T_OS_ESCAPE_PATH,
           T_HTTP_TOKEN_STOP);

    /* we explicitly dealt with NUL above
     * in case some strchr() do bogosity with it */

    for (c = 1; c < 256; ++c) {
        flags = 0;
        if (c % 20 == 0)
            printf("\n    ");

        /* escape_shell_cmd */
#if defined(WIN32) || defined(OS2)
        /* Win32/OS2 have many of the same vulnerable characters
         * as Unix sh, plus the carriage return and percent char.
         * The proper escaping of these characters varies from unix
         * since Win32/OS2 use carets or doubled-double quotes, 
         * and neither lf nor cr can be escaped.  We escape unix 
         * specific as well, to assure that cross-compiled unix 
         * applications behave similiarly when invoked on win32/os2.
         *
         * Rem please keep in-sync with apr's list in win32/filesys.c
         */
        if (strchr("&;`'\"|*?~<>^()[]{}$\\\n\r%", c)) {
            flags |= T_ESCAPE_SHELL_CMD;
        }
#else
        if (strchr("&;`'\"|*?~<>^()[]{}$\\\n", c)) {
            flags |= T_ESCAPE_SHELL_CMD;
        }
#endif

        if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:@&=~", c)) {
            flags |= T_ESCAPE_PATH_SEGMENT;
        }

        if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:@&=/~", c)) {
            flags |= T_OS_ESCAPE_PATH;
        }

        /* these are the "tspecials" from RFC2068 */
        if (apr_iscntrl(c) || strchr(" \t()<>@,;:\\/[]?={}", c)) {
            flags |= T_HTTP_TOKEN_STOP;
        }

        printf("%u%c", flags, (c < 255) ? ',' : ' ');

    }

    printf("\n};\n");

    return 0;
}