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Filter out non-alpha-numeric characters from the default

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seed.  No point in generating one that skey(1) will reject.
This commit is contained in:
thorpej 2000-07-28 19:19:23 +00:00
parent 457d8d7c7e
commit c48cedd0f4
1 changed files with 15 additions and 2 deletions
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17
usr.bin/skeyinit/skeyinit.c
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@ -1,4 +1,4 @@
/* $NetBSD: skeyinit.c,v 1.13 2000/07/07 00:18:29 mjl Exp $ */
/* $NetBSD: skeyinit.c,v 1.14 2000/07/28 19:19:23 thorpej Exp $ */
/* S/KEY v1.1b (skeyinit.c)
*
@ -58,7 +58,20 @@ int main(int argc, char **argv)
if (gethostname(hostname, sizeof(hostname)) < 0)
err(1, "gethostname");
(void)strncpy(defaultseed, hostname, sizeof(defaultseed)- 1);
/*
* Copy the hostname into the default seed, eliminating any
* non alpha-numeric characters.
*/
for (i = 0, l = 0; l < sizeof(defaultseed); i++) {
if (hostname[i] == '\0') {
defaultseed[l] = hostname[i];
break;
}
if (isalnum(hostname[i]))
defaultseed[l++] = hostname[i];
}
defaultseed[SKEY_NAMELEN] = '\0';
(void)time(&now);
(void)sprintf(tbuf, "%05ld", (long) (now % 100000));