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Backport BIND code to query name as TLD.

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This commit is contained in:
Ulrich Drepper 2011-05-07 13:05:19 -04:00
parent 47c3cd7a74
commit f87dfb1f11
6 changed files with 30 additions and 10 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2011-05-07 Ulrich Drepper <drepper@gmail.com>
[BZ #12734]
* resolv/resolv.h: Define RES_NOTLDQUERY.
* resolv/res_init.c (res_setoptions): Recognize no_tld_query and
no-tld-query and set RES_NOTLDQUERY.
* resolv/res_debug.c (p_option): Handle RES_NOTLDQUERY.
* resolv/res_query.c (__libc_res_nsearch): Backport changes from
modern BIND to search name as TLD unless forbidden.
2011-05-07 Petr Baudis <pasky@suse.cz>
Ulrich Drepper <drepper@gmail.com>

2
NEWS
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@ -24,7 +24,7 @@ Version 2.14
11724, 12393, 12420, 12445, 12454, 12460, 12469, 12489, 12509, 12510,
12518, 12583, 12587, 12597, 12631, 12650, 12653, 12655, 12685, 12714,
12717, 12723
12717, 12723, 12734
Version 2.13

5
resolv/res_debug.c
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@ -189,7 +189,7 @@ do_section(const res_state statp,
buf = malloc(buflen += 1024);
if (buf == NULL) {
fprintf(file,
";; memory allocation failure\n");
";; memory allocation failure\n");
return;
}
continue;
@ -356,7 +356,7 @@ const struct res_sym __p_class_syms[] = {
{C_HS, "HESIOD"},
{C_ANY, "ANY"},
{C_NONE, "NONE"},
{C_IN, (char *)0}
{C_IN, (char *)0}
};
libresolv_hidden_data_def (__p_class_syms)
@ -588,6 +588,7 @@ p_option(u_long option) {
case RES_USEBSTRING: return "ip6-bytstring";
case RES_USE_EDNS0: return "edns0";
case RES_USE_DNSSEC: return "dnssec";
case RES_NOTLDQUERY: return "no-tld-query";
/* XXX nonreentrant */
default: sprintf(nbuf, "?0x%lx?", (u_long)option);
return (nbuf);

5
resolv/res_init.c
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@ -545,6 +545,11 @@ res_setoptions(res_state statp, const char *options, const char *source) {
} else if (!strncmp(cp, "single-request",
sizeof("single-request") - 1)) {
statp->options |= RES_SNGLKUP;
} else if (!strncmp(cp, "no_tld_query",
sizeof("no_tld_query") - 1) ||
!strncmp(cp, "no-tld-query",
sizeof("no-tld-query") - 1)) {
statp->options |= RES_NOTLDQUERY;
} else {
/* XXX - print a warning here? */
}

14
resolv/res_query.c
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@ -123,7 +123,7 @@ __libc_res_nquery(res_state statp,
{
HEADER *hp = (HEADER *) answer;
int n, use_malloc = 0;
u_int oflags = statp->_flags;
u_int oflags = statp->_flags;
size_t bufsize = (type == T_UNSPEC ? 2 : 1) * QUERYSIZE;
u_char *buf = alloca (bufsize);
@ -210,7 +210,7 @@ __libc_res_nquery(res_state statp,
if (statp->options & RES_DEBUG)
printf(";; res_nquery: retry without EDNS0\n");
#endif
goto again;
goto again;
}
#ifdef DEBUG
if (statp->options & RES_DEBUG)
@ -344,6 +344,7 @@ __libc_res_nsearch(res_state statp,
int trailing_dot, ret, saved_herrno;
int got_nodata = 0, got_servfail = 0, root_on_list = 0;
int tried_as_is = 0;
int searched = 0;
__set_errno (0);
RES_SET_H_ERRNO(statp, HOST_NOT_FOUND); /* True if we never query. */
@ -406,6 +407,7 @@ __libc_res_nsearch(res_state statp,
for (domain = (const char * const *)statp->dnsrch;
*domain && !done;
domain++) {
searched = 1;
if (domain[0][0] == '\0' ||
(domain[0][0] == '.' && domain[0][1] == '\0'))
@ -477,11 +479,11 @@ __libc_res_nsearch(res_state statp,
}
/*
* If the name has any dots at all, and no earlier 'as-is' query
* for the name, and "." is not on the search list, then try an as-is
* query now.
* f the query has not already been tried as is then try it
* unless RES_NOTLDQUERY is set and there were no dots.
*/
if (dots && !(tried_as_is || root_on_list)) {
if ((dots || !searched || (statp->options & RES_NOTLDQUERY) == 0)
&& !(tried_as_is || root_on_list)) {
ret = __libc_res_nquerydomain(statp, name, NULL, class, type,
answer, anslen, answerp,
answerp2, nanswerp2, resplen2);

4
resolv/resolv.h
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@ -102,7 +102,7 @@ typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *__ns,
# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
struct __res_state {
int retrans; /* retransmition time interval */
int retrans; /* retransmition time interval */
int retry; /* number of times to retransmit */
u_long options; /* option flags - see below. */
int nscount; /* number of name servers */
@ -219,6 +219,8 @@ struct res_sym {
#define RES_SNGLKUPREOP 0x00400000 /* -"-, but open new socket for each
request */
#define RES_USE_DNSSEC 0x00800000 /* use DNSSEC using OK bit in OPT */
#define RES_NOTLDQUERY 0x01000000 /* Do not look up unqualified name
as a TLD. */
#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)