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MF src/libexec/telnetd: Verify the reverse DNS lookup

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ala rlogind.
Suggested by: markm


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@45377 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
This commit is contained in:
brian 1999-04-06 12:41:27 +00:00
parent 8808a173ed
commit a483d5b52d
1 changed files with 18 additions and 2 deletions
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20
telnetd/telnetd.c
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@ -42,7 +42,7 @@ static const char copyright[] =
static const char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95";
#endif
static const char rcsid[] =
"$Id: telnetd.c,v 1.4 1998/02/16 12:09:27 markm Exp $";
"$Id: telnetd.c,v 1.5 1998/12/16 06:06:06 peter Exp $";
#endif /* not lint */
#include "telnetd.h"
@ -869,7 +869,23 @@ doit(who)
} else if (hp &&
(strlen(hp->h_name) <= (unsigned int)((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);
}