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After receiving a connection and doing a reverse

Browse source 
lookup on the incoming IP, do a forward lookup on
the result and make sure that the IP is in the
resulting list.  If it's not, put the IP number
in utmp/wtmp instead of the rogue name.

Stolen from: rlogind
Suggested by: sef
This commit is contained in:
Brian Somers 1999-04-06 00:29:41 +00:00
parent 5999400ea8
commit 51d8a6713f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=45353
1 changed files with 18 additions and 2 deletions
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20
libexec/telnetd/telnetd.c
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@ -42,7 +42,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)telnetd.c 8.2 (Berkeley) 12/15/93";
#endif
static const char rcsid[] =
"$Id: telnetd.c,v 1.14 1998/04/26 06:51:36 phk Exp $";
"$Id: telnetd.c,v 1.15 1998/12/16 06:04:29 peter Exp $";
#endif /* not lint */
#include "telnetd.h"
@ -821,7 +821,23 @@ doit(who)
Please contact your net administrator");
} else if (hp &&
(strlen(hp->h_name) <= ((utmp_len < 0) ? -utmp_len : utmp_len))) {
host = hp->h_name;
strncpy(remote_host_name, hp->h_name,
sizeof(remote_host_name)-1);
hp = gethostbyname(remote_host_name);
if (hp == NULL)
host = inet_ntoa(who->sin_addr);
else for (; ; hp->h_addr_list++) {
if (hp->h_addr_list[0] == NULL) {
/* End of list - ditch it */
host = inet_ntoa(who->sin_addr);
break;
}
if (!bcmp(hp->h_addr_list[0], (caddr_t)&who->sin_addr,
sizeof(who->sin_addr))) {
host = hp->h_name;
break; /* OK! */
}
}
} else {
host = inet_ntoa(who->sin_addr);
}