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Mixed with srandomdev() BSD code

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This commit is contained in:
Francis Dupont
2022-01-05 20:21:43 +01:00
committed by Thomas Markwalder
parent eece3e17eb
commit 46de3dfd99
1 changed files with 28 additions and 13 deletions
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41
client/dhclient.c
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@@ -3,7 +3,7 @@
DHCP Client. */ DHCP Client. */
/* /*
* Copyright (c) 2004-2020 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 2004-2022 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-2003 by Internet Software Consortium * Copyright (c) 1995-2003 by Internet Software Consortium
* *
* This Source Code Form is subject to the terms of the Mozilla Public * This Source Code Form is subject to the terms of the Mozilla Public
@@ -829,21 +829,36 @@ main(int argc, char **argv) {
? DISCOVER_REQUESTED ? DISCOVER_REQUESTED
: DISCOVER_RUNNING); : DISCOVER_RUNNING);
/* Make up a seed for the random number generator from current /* PLEASE PREFER the random device: not all systems use random
time plus the sum of the last four bytes of each * process identifiers so the alternative can be predictable. */
interface's hardware address interpreted as an integer.
Not much entropy, but we're booting, so we're not likely to
find anything better. */
seed = 0; seed = 0;
for (ip = interfaces; ip; ip = ip->next) { size_t nrnd = 0;
int junk; #ifdef ISC_PATH_RANDOMDEV
memcpy(&junk, FILE *frnd = fopen(ISC_PATH_RANDOMDEV, "r");
&ip->hw_address.hbuf[ip->hw_address.hlen - if (frnd) {
sizeof seed], sizeof seed); nrnd = fread(&seed, sizeof(seed), 1, frnd);
seed += junk; fclose(frnd);
} }
srandom(seed + cur_time + (unsigned)getpid()); #endif
/* Please leave the compiler to emit a warning about a constant
* condition in the if test. */
if (!nrnd) {
/* Make up a seed for the random number generator from current
time plus the sum of the last four bytes of each
interface's hardware address interpreted as an integer.
Not much entropy, but we're booting, so we're not likely to
find anything better. */
for (ip = interfaces; ip; ip = ip->next) {
int junk;
memcpy(&junk,
&ip->hw_address.hbuf[ip->hw_address.hlen -
sizeof seed], sizeof seed);
seed += junk;
}
seed += cur_time + (unsigned)getpid();
}
srandom(seed);
/* /*
* Establish a default DUID. We always do so for v6 and * Establish a default DUID. We always do so for v6 and