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Annotation of embedaddon/libpdel/ppp/ppp_util.c, revision 1.1

1.1     ! misho       1: 
        !             2: /*
        !             3:  * Copyright (c) 2001-2002 Packet Design, LLC.
        !             4:  * All rights reserved.
        !             5:  * 
        !             6:  * Subject to the following obligations and disclaimer of warranty,
        !             7:  * use and redistribution of this software, in source or object code
        !             8:  * forms, with or without modifications are expressly permitted by
        !             9:  * Packet Design; provided, however, that:
        !            10:  * 
        !            11:  *    (i)  Any and all reproductions of the source or object code
        !            12:  *         must include the copyright notice above and the following
        !            13:  *         disclaimer of warranties; and
        !            14:  *    (ii) No rights are granted, in any manner or form, to use
        !            15:  *         Packet Design trademarks, including the mark "PACKET DESIGN"
        !            16:  *         on advertising, endorsements, or otherwise except as such
        !            17:  *         appears in the above copyright notice or in the software.
        !            18:  * 
        !            19:  * THIS SOFTWARE IS BEING PROVIDED BY PACKET DESIGN "AS IS", AND
        !            20:  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, PACKET DESIGN MAKES NO
        !            21:  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING
        !            22:  * THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED
        !            23:  * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
        !            24:  * OR NON-INFRINGEMENT.  PACKET DESIGN DOES NOT WARRANT, GUARANTEE,
        !            25:  * OR MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS
        !            26:  * OF THE USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY,
        !            27:  * RELIABILITY OR OTHERWISE.  IN NO EVENT SHALL PACKET DESIGN BE
        !            28:  * LIABLE FOR ANY DAMAGES RESULTING FROM OR ARISING OUT OF ANY USE
        !            29:  * OF THIS SOFTWARE, INCLUDING WITHOUT LIMITATION, ANY DIRECT,
        !            30:  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE, OR CONSEQUENTIAL
        !            31:  * DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, LOSS OF
        !            32:  * USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY THEORY OF
        !            33:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
        !            34:  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
        !            35:  * THE USE OF THIS SOFTWARE, EVEN IF PACKET DESIGN IS ADVISED OF
        !            36:  * THE POSSIBILITY OF SUCH DAMAGE.
        !            37:  *
        !            38:  * Author: Archie Cobbs <archie@freebsd.org>
        !            39:  */
        !            40: 
        !            41: #include "ppp/ppp_defs.h"
        !            42: #include "ppp/ppp_util.h"
        !            43: 
        !            44: #define PATH_RANDOM            "/dev/urandom"
        !            45: 
        !            46: /*
        !            47:  * Decode ASCII message
        !            48:  */
        !            49: void
        !            50: ppp_util_ascify(char *buf, size_t bsiz, const u_char *data, size_t len)
        !            51: {
        !            52:        char *bp = buf;
        !            53:        int i;
        !            54: 
        !            55:        for (bp = buf, i = 0; i < len; i++) {
        !            56:                const char ch = (char)data[i];
        !            57: 
        !            58:                if (bsiz < 3)
        !            59:                        break;
        !            60:                switch (ch) {
        !            61:                case '\t':
        !            62:                        *bp++ = '\\';
        !            63:                        *bp++ = 't';
        !            64:                        bsiz -= 2;
        !            65:                        break;
        !            66:                case '\n':
        !            67:                        *bp++ = '\\';
        !            68:                        *bp++ = 'n';
        !            69:                        bsiz -= 2;
        !            70:                        break;
        !            71:                case '\r':
        !            72:                        *bp++ = '\\';
        !            73:                        *bp++ = 'r';
        !            74:                        bsiz -= 2;
        !            75:                        break;
        !            76:                default:
        !            77:                        if (isprint(ch & 0x7f)) {
        !            78:                                *bp++ = ch;
        !            79:                                bsiz--;
        !            80:                        } else {
        !            81:                                *bp++ = '^';
        !            82:                                *bp++ = '@' + (ch & 0x1f);
        !            83:                                bsiz -= 2;
        !            84:                        }
        !            85:                        break;
        !            86:                }
        !            87:        }
        !            88:        *bp = '\0';
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Generate random bytes
        !            93:  */
        !            94: int
        !            95: ppp_util_random(void *buf, size_t len)
        !            96: {
        !            97:        int rlen;
        !            98:        int fd;
        !            99: 
        !           100:        if ((fd = open(PATH_RANDOM, O_RDONLY)) == -1)
        !           101:                return (-1);
        !           102:        rlen = read(fd, buf, len);
        !           103:        (void)close(fd);
        !           104:        if (rlen == -1)
        !           105:                return (-1);
        !           106:        if (rlen != len) {
        !           107:                errno = ENXIO;
        !           108:                return (-1);
        !           109:        }
        !           110:        return (0);
        !           111: }
        !           112: 
        !           113: