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MF src/libexec/telnetd: Verify the reverse DNS lookup
ala rlogind. Suggested by: markm git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@45377 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
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@ -42,7 +42,7 @@ static const char copyright[] =
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static const char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95";
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#endif
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static const char rcsid[] =
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"$Id: telnetd.c,v 1.4 1998/02/16 12:09:27 markm Exp $";
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"$Id: telnetd.c,v 1.5 1998/12/16 06:06:06 peter Exp $";
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#endif /* not lint */
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#include "telnetd.h"
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@ -869,7 +869,23 @@ doit(who)
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} else if (hp &&
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(strlen(hp->h_name) <= (unsigned int)((utmp_len < 0) ? -utmp_len
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: utmp_len))) {
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host = hp->h_name;
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strncpy(remote_host_name, hp->h_name,
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sizeof(remote_host_name)-1);
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hp = gethostbyname(remote_host_name);
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if (hp == NULL)
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host = inet_ntoa(who->sin_addr);
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else for (; ; hp->h_addr_list++) {
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if (hp->h_addr_list[0] == NULL) {
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/* End of list - ditch it */
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host = inet_ntoa(who->sin_addr);
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break;
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}
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if (!bcmp(hp->h_addr_list[0], (caddr_t)&who->sin_addr,
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sizeof(who->sin_addr))) {
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host = hp->h_name;
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break; /* OK! */
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}
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}
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} else {
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host = inet_ntoa(who->sin_addr);
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}
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