The Tor Browser: netwerk/sctp/src/user_environment.c@ca08bd8f51b2

     1 /*-

     2  * Copyright (c) 2009-2010 Brad Penoff

     3  * Copyright (c) 2009-2010 Humaira Kamal

     4  * Copyright (c) 2011-2012 Irene Ruengeler

     5  * Copyright (c) 2011-2012 Michael Tuexen

     6  *

     7  * All rights reserved.

     8  *

     9  * Redistribution and use in source and binary forms, with or without

    10  * modification, are permitted provided that the following conditions

    11  * are met:

    12  * 1. Redistributions of source code must retain the above copyright

    13  *    notice, this list of conditions and the following disclaimer.

    14  * 2. Redistributions in binary form must reproduce the above copyright

    15  *    notice, this list of conditions and the following disclaimer in the

    16  *    documentation and/or other materials provided with the distribution.

    17  *

    18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND

    19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

    21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

    22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

    23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

    24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

    26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

    27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

    28  * SUCH DAMAGE.

    29  */

    31 /* __Userspace__ */

    33 #include <stdlib.h>

    34 #if !defined (__Userspace_os_Windows)

    35 #include <stdint.h>

    36 #include <netinet/sctp_os_userspace.h>

    37 #endif

    38 #include <user_environment.h>

    39 #include <sys/types.h>

    40 /* #include <sys/param.h> defines MIN */

    41 #if !defined(MIN)

    42 #define MIN(arg1,arg2) ((arg1) < (arg2) ? (arg1) : (arg2))

    43 #endif

    44 #include <string.h>

    46 #define uHZ 1000

    48 /* See user_include/user_environment.h for comments about these variables */

    49 int maxsockets = 25600;

    50 int hz = uHZ;

    51 int ip_defttl = 64;

    52 int ipport_firstauto = 49152, ipport_lastauto = 65535;

    53 int nmbclusters = 65536;

    55 /* Source ip_output.c. extern'd in ip_var.h */

    56 u_short ip_id = 0; /*__Userspace__ TODO Should it be initialized to zero? */

    58 /* used in user_include/user_atomic.h in order to make the operations

    59  * defined there truly atomic

    60  */

    61 userland_mutex_t atomic_mtx;

    63 /* Source: /usr/src/sys/dev/random/harvest.c */

    64 static int read_random_phony(void *, int);

    66 static int (*read_func)(void *, int) = read_random_phony;

    68 /* Userland-visible version of read_random */

    69 int

    70 read_random(void *buf, int count)

    71 {

    72 	return ((*read_func)(buf, count));

    73 }

    75 /* If the entropy device is not loaded, make a token effort to

    76  * provide _some_ kind of randomness. This should only be used

    77  * inside other RNG's, like arc4random(9).

    78  */

    79 static int

    80 read_random_phony(void *buf, int count)

    81 {

    82 	uint32_t randval;

    83 	int size, i;

    85 	/* srandom() is called in kern/init_main.c:proc0_post() */

    87 	/* Fill buf[] with random(9) output */

    88 	for (i = 0; i < count; i+= (int)sizeof(uint32_t)) {

    89 		randval = random();

    90 		size = MIN(count - i, (int)sizeof(uint32_t));

    91 		memcpy(&((char *)buf)[i], &randval, (size_t)size);

    92 	}

    94 	return (count);

    95 }

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