diff options
Diffstat (limited to 'resolv/res_comp.c')
| -rw-r--r-- | resolv/res_comp.c | 48 |
1 files changed, 15 insertions, 33 deletions
diff --git a/resolv/res_comp.c b/resolv/res_comp.c index 103ebd9..7da1c3e 100644 --- a/resolv/res_comp.c +++ b/resolv/res_comp.c @@ -58,6 +58,7 @@ static char sccsid[] = "@(#)res_comp.c 8.1 (Berkeley) 6/4/93"; static char rcsid[] = "$Id$"; #endif /* LIBC_SCCS and not lint */ +#include <sys/types.h> #include <sys/param.h> #include <netinet/in.h> #include <arpa/nameser.h> @@ -340,34 +341,6 @@ dn_find(exp_dn, msg, dnptrs, lastdnptr) * Verify that a domain name uses an acceptable character set. */ -/**** -To: "Lawrence R. Rogers" <lrr@cert.org> -cc: cert@cert.org, pvm@home.net -Subject: Re: VU#14542 -In-reply-to: Your message of "Mon, 19 Feb 1996 17:16:27 PST." -Date: Tue, 20 Feb 1996 22:37:21 -0800 -From: Paul A Vixie <vixie@wisdom.home.vix.com> - -in retrospect, - - hostname = firstlabel ( "." otherlabel )+ - firstchar = [a-zA-Z0-9_] - otherchar = [a-zA-Z0-9_-/] - firstlabel = firstchar otherchar* - otherlabel = otherchar+ - -should have been - - hostname = label ( "." label )+ - firstchar = [a-zA-Z0-9] - otherchar = [a-zA-Z0-9_-] - label = firstchar otherchar* - -i know of no example of a real host name that needs the looser rule i sent -earlier. since i'm only trying to bend the spec to fit actual known uses, -i should not have widened the rules as far as i did earlier. -****/ - /* * Note the conspicuous absence of ctype macros in these definitions. On * non-ASCII hosts, we can't depend on string literals or ctype macros to @@ -434,17 +407,26 @@ int res_mailok(dn) const char *dn; { - int ch, pch; + int ch, escaped = 0; - pch = '\0'; + /* "." is a valid missing representation */ + if (*dn == '\0') + return(1); + + /* otherwise <label>.<hostname> */ while ((ch = *dn++) != '\0') { if (!domainchar(ch)) return (0); - if (periodchar(ch) && !bslashchar(pch)) + if (!escaped && periodchar(ch)) break; - pch = ch; + if (escaped) + escaped = 0; + else if (bslashchar(ch)) + escaped = 1; } - return (res_hnok(dn)); + if (periodchar(ch)) + return (res_hnok(dn)); + return(0); } /* |