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resolv: Lift domain search list limits [BZ #19569] [BZ #21475]

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This change uses the extended resolver state in struct resolv_conf to
store the search list.  If applications have not patched the _res
object directly, this extended search list will be used by the stub
resolver during name resolution.
This commit is contained in:
Florian Weimer
2017-07-01 00:53:05 +02:00
parent f30a54b21b
commit 3f853f22c8
8 changed files with 382 additions and 81 deletions
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222
resolv/res_init.c
View File

@ -124,18 +124,75 @@ is_sort_mask (char ch)
return ch == '/' || ch == '&';
}
/* Array of strings for the search array. The backing store is
managed separately. */
#define DYNARRAY_STRUCT search_list
#define DYNARRAY_ELEMENT const char *
#define DYNARRAY_INITIAL_SIZE 4
#define DYNARRAY_PREFIX search_list_
#include <malloc/dynarray-skeleton.c>
/* resolv.conf parser state and results. */
struct resolv_conf_parser
{
char *buffer; /* Temporary buffer for reading lines. */
char *search_list_store; /* Backing storage for search list entries. */
struct search_list search_list; /* Points into search_list_store. */
};
static void
resolv_conf_parser_init (struct resolv_conf_parser *parser)
{
parser->buffer = NULL;
parser->search_list_store = NULL;
search_list_init (&parser->search_list);
}
static void
resolv_conf_parser_free (struct resolv_conf_parser *parser)
{
free (parser->buffer);
free (parser->search_list_store);
search_list_free (&parser->search_list);
}
/* Try to obtain the domain name from the host name and store it in
*RESULT. Return false on memory allocation failure. If the domain
name cannot be determined for any other reason, write NULL to
*RESULT and return true. */
static bool
domain_from_hostname (char **result)
{
char buf[256];
/* gethostbyname may not terminate the buffer. */
buf[sizeof (buf) - 1] = '\0';
if (__gethostname (buf, sizeof (buf) - 1) == 0)
{
char *dot = strchr (buf, '.');
if (dot != NULL)
{
*result = __strdup (dot + 1);
if (*result == NULL)
return false;
return true;
}
}
*result = NULL;
return true;
}
/* Internal helper function for __res_vinit, to aid with resource
deallocation and error handling. Return true on success, false on
failure. */
static bool
res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
res_vinit_1 (res_state statp, bool preinit, FILE *fp,
struct resolv_conf_parser *parser)
{
char *cp, **pp;
char *cp;
size_t buffer_size = 0;
int nserv = 0; /* Number of nameservers read from file. */
bool have_serv6 = false;
bool haveenv = false;
bool havesearch = false;
int nsort = 0;
char *net;
@ -162,39 +219,40 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
/* Allow user to override the local domain definition. */
if ((cp = getenv ("LOCALDOMAIN")) != NULL)
{
strncpy (statp->defdname, cp, sizeof (statp->defdname) - 1);
statp->defdname[sizeof (statp->defdname) - 1] = '\0';
/* The code below splits the string in place. */
cp = __strdup (cp);
if (cp == NULL)
return false;
free (parser->search_list_store);
parser->search_list_store = cp;
haveenv = true;
/* The string will be truncated as needed below. */
search_list_add (&parser->search_list, cp);
/* Set search list to be blank-separated strings from rest of
env value. Permits users of LOCALDOMAIN to still have a
search list, and anyone to set the one that they want to use
as an individual (even more important now that the rfc1535
stuff restricts searches). */
cp = statp->defdname;
pp = statp->dnsrch;
*pp++ = cp;
for (int n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++)
for (bool in_name = true; *cp != '\0'; cp++)
{
if (*cp == '\n')
break;
{
*cp = '\0';
break;
}
else if (*cp == ' ' || *cp == '\t')
{
*cp = 0;
n = 1;
*cp = '\0';
in_name = false;
}
else if (n > 0)
else if (!in_name)
{
*pp++ = cp;
n = 0;
havesearch = true;
search_list_add (&parser->search_list, cp);
in_name = true;
}
}
/* Null terminate last domain if there are excess. */
while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
cp++;
*cp = '\0';
*pp++ = 0;
}
#define MATCH(line, name) \
@ -210,7 +268,7 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
while (true)
{
{
ssize_t ret = __getline (buffer, &buffer_size, fp);
ssize_t ret = __getline (&parser->buffer, &buffer_size, fp);
if (ret <= 0)
{
if (_IO_ferror_unlocked (fp))
@ -221,73 +279,82 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
}
/* Skip comments. */
if (**buffer == ';' || **buffer == '#')
if (*parser->buffer == ';' || *parser->buffer == '#')
continue;
/* Read default domain name. */
if (MATCH (*buffer, "domain"))
if (MATCH (parser->buffer, "domain"))
{
if (haveenv)
/* LOCALDOMAIN overrides the configuration file. */
continue;
cp = *buffer + sizeof ("domain") - 1;
cp = parser->buffer + sizeof ("domain") - 1;
while (*cp == ' ' || *cp == '\t')
cp++;
if ((*cp == '\0') || (*cp == '\n'))
continue;
strncpy (statp->defdname, cp, sizeof (statp->defdname) - 1);
statp->defdname[sizeof (statp->defdname) - 1] = '\0';
if ((cp = strpbrk (statp->defdname, " \t\n")) != NULL)
cp = __strdup (cp);
if (cp == NULL)
return false;
free (parser->search_list_store);
parser->search_list_store = cp;
search_list_clear (&parser->search_list);
search_list_add (&parser->search_list, cp);
/* Replace trailing whitespace. */
if ((cp = strpbrk (cp, " \t\n")) != NULL)
*cp = '\0';
havesearch = false;
continue;
}
/* Set search list. */
if (MATCH (*buffer, "search"))
if (MATCH (parser->buffer, "search"))
{
if (haveenv)
/* LOCALDOMAIN overrides the configuration file. */
continue;
cp = *buffer + sizeof ("search") - 1;
cp = parser->buffer + sizeof ("search") - 1;
while (*cp == ' ' || *cp == '\t')
cp++;
if ((*cp == '\0') || (*cp == '\n'))
continue;
strncpy (statp->defdname, cp, sizeof (statp->defdname) - 1);
statp->defdname[sizeof (statp->defdname) - 1] = '\0';
if ((cp = strchr (statp->defdname, '\n')) != NULL)
*cp = '\0';
{
char *p = strchr (cp, '\n');
if (p != NULL)
*p = '\0';
}
cp = __strdup (cp);
if (cp == NULL)
return false;
free (parser->search_list_store);
parser->search_list_store = cp;
/* The string is truncated below. */
search_list_clear (&parser->search_list);
search_list_add (&parser->search_list, cp);
/* Set search list to be blank-separated strings on rest
of line. */
cp = statp->defdname;
pp = statp->dnsrch;
*pp++ = cp;
for (int n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++)
for (bool in_name = true; *cp != '\0'; cp++)
{
if (*cp == ' ' || *cp == '\t')
{
*cp = 0;
n = 1;
*cp = '\0';
in_name = false;
}
else if (n)
else if (!in_name)
{
*pp++ = cp;
n = 0;
search_list_add (&parser->search_list, cp);
in_name = true;
}
}
/* Null terminate last domain if there are excess. */
while (*cp != '\0' && *cp != ' ' && *cp != '\t')
cp++;
*cp = '\0';
*pp++ = 0;
havesearch = true;
continue;
}
/* Read nameservers to query. */
if (MATCH (*buffer, "nameserver") && nserv < MAXNS)
if (MATCH (parser->buffer, "nameserver") && nserv < MAXNS)
{
struct in_addr a;
cp = *buffer + sizeof ("nameserver") - 1;
cp = parser->buffer + sizeof ("nameserver") - 1;
while (*cp == ' ' || *cp == '\t')
cp++;
if ((*cp != '\0') && (*cp != '\n') && __inet_aton (cp, &a))
@ -335,11 +402,11 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
}
continue;
}
if (MATCH (*buffer, "sortlist"))
if (MATCH (parser->buffer, "sortlist"))
{
struct in_addr a;
cp = *buffer + sizeof ("sortlist") - 1;
cp = parser->buffer + sizeof ("sortlist") - 1;
while (nsort < MAXRESOLVSORT)
{
while (*cp == ' ' || *cp == '\t')
@ -379,9 +446,9 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
}
continue;
}
if (MATCH (*buffer, "options"))
if (MATCH (parser->buffer, "options"))
{
res_setoptions (statp, *buffer + sizeof ("options") - 1);
res_setoptions (statp, parser->buffer + sizeof ("options") - 1);
continue;
}
}
@ -399,25 +466,29 @@ res_vinit_1 (res_state statp, bool preinit, FILE *fp, char **buffer)
statp->nsaddr.sin_port = htons (NAMESERVER_PORT);
statp->nscount = 1;
}
if (statp->defdname[0] == 0)
{
char buf[sizeof (statp->defdname)];
if (__gethostname (buf, sizeof (statp->defdname) - 1) == 0
&& (cp = strchr (buf, '.')) != NULL)
strcpy (statp->defdname, cp + 1);
}
/* Find components of local domain that might be searched. */
if (!havesearch)
if (search_list_size (&parser->search_list) == 0)
{
pp = statp->dnsrch;
*pp++ = statp->defdname;
*pp = NULL;
char *domain;
if (!domain_from_hostname (&domain))
return false;
if (domain != NULL)
{
free (parser->search_list_store);
parser->search_list_store = domain;
search_list_add (&parser->search_list, domain);
}
}
if ((cp = getenv ("RES_OPTIONS")) != NULL)
res_setoptions (statp, cp);
if (search_list_has_failed (&parser->search_list))
{
__set_errno (ENOMEM);
return false;
}
statp->options |= RES_INIT;
return true;
}
@ -453,13 +524,17 @@ __res_vinit (res_state statp, int preinit)
return -1;
}
char *buffer = NULL;
bool ok = res_vinit_1 (statp, preinit, fp, &buffer);
free (buffer);
struct resolv_conf_parser parser;
resolv_conf_parser_init (&parser);
bool ok = res_vinit_1 (statp, preinit, fp, &parser);
if (ok)
{
struct resolv_conf init = { 0 }; /* No data yet. */
struct resolv_conf init =
{
.search_list = search_list_begin (&parser.search_list),
.search_list_size = search_list_size (&parser.search_list),
};
struct resolv_conf *conf = __resolv_conf_allocate (&init);
if (conf == NULL)
ok = false;
@ -469,6 +544,7 @@ __res_vinit (res_state statp, int preinit)
__resolv_conf_put (conf);
}
}
resolv_conf_parser_free (&parser);
if (!ok)
{

11
resolv/res_query.c
View File

@ -326,7 +326,7 @@ __res_context_search (struct resolv_context *ctx,
int *nanswerp2, int *resplen2, int *answerp2_malloced)
{
struct __res_state *statp = ctx->resp;
const char *cp, * const *domain;
const char *cp;
HEADER *hp = (HEADER *) answer;
char tmp[NS_MAXDNAME];
u_int dots;
@ -392,10 +392,11 @@ __res_context_search (struct resolv_context *ctx,
(dots && !trailing_dot && (statp->options & RES_DNSRCH) != 0)) {
int done = 0;
for (domain = (const char * const *)statp->dnsrch;
*domain && !done;
domain++) {
const char *dname = domain[0];
for (size_t domain_index = 0; !done; ++domain_index) {
const char *dname = __resolv_context_search_list
(ctx, domain_index);
if (dname == NULL)
break;
searched = 1;
/* __res_context_querydoman concatenates name

65
resolv/resolv_conf.c
View File

@ -133,6 +133,34 @@ static bool
resolv_conf_matches (const struct __res_state *resp,
const struct resolv_conf *conf)
{
/* Check that the search list in *RESP has not been modified by the
application. */
{
if (!(resp->dnsrch[0] == resp->defdname
&& resp->dnsrch[MAXDNSRCH] == NULL))
return false;
size_t search_list_size = 0;
for (size_t i = 0; i < conf->search_list_size; ++i)
{
if (resp->dnsrch[i] != NULL)
{
search_list_size += strlen (resp->dnsrch[i]) + 1;
if (strcmp (resp->dnsrch[i], conf->search_list[i]) != 0)
return false;
}
else
{
/* resp->dnsrch is truncated if the number of elements
exceeds MAXDNSRCH, or if the combined storage space for
the search list exceeds what can be stored in
resp->defdname. */
if (i == MAXDNSRCH || search_list_size > sizeof (resp->dnsrch))
break;
/* Otherwise, a mismatch indicates a match failure. */
return false;
}
}
}
return true;
}
@ -162,10 +190,17 @@ __resolv_conf_put (struct resolv_conf *conf)
struct resolv_conf *
__resolv_conf_allocate (const struct resolv_conf *init)
{
/* Space needed by the strings. */
size_t string_space = 0;
for (size_t i = 0; i < init->search_list_size; ++i)
string_space += strlen (init->search_list[i]) + 1;
/* Allocate the buffer. */
void *ptr;
struct alloc_buffer buffer = alloc_buffer_allocate
(sizeof (struct resolv_conf),
(sizeof (struct resolv_conf)
+ init->search_list_size * sizeof (init->search_list[0])
+ string_space,
&ptr);
struct resolv_conf *conf
= alloc_buffer_alloc (&buffer, struct resolv_conf);
@ -178,6 +213,16 @@ __resolv_conf_allocate (const struct resolv_conf *init)
conf->__refcount = 1;
conf->initstamp = __res_initstamp;
/* Allocate and fill the search list array. */
{
conf->search_list_size = init->search_list_size;
const char **array = alloc_buffer_alloc_array
(&buffer, const char *, init->search_list_size);
conf->search_list = array;
for (size_t i = 0; i < init->search_list_size; ++i)
array[i] = alloc_buffer_copy_string (&buffer, init->search_list[i]);
}
assert (!alloc_buffer_has_failed (&buffer));
return conf;
}
@ -186,6 +231,24 @@ __resolv_conf_allocate (const struct resolv_conf *init)
static __attribute__ ((nonnull (1, 2), warn_unused_result)) bool
update_from_conf (struct __res_state *resp, const struct resolv_conf *conf)
{
/* Fill in the prefix of the search list. It is truncated either at
MAXDNSRCH, or if reps->defdname has insufficient space. */
{
struct alloc_buffer buffer
= alloc_buffer_create (resp->defdname, sizeof (resp->defdname));
size_t size = conf->search_list_size;
size_t i;
for (i = 0; i < size && i < MAXDNSRCH; ++i)
{
resp->dnsrch[i] = alloc_buffer_copy_string
(&buffer, conf->search_list[i]);
if (resp->dnsrch[i] == NULL)
/* No more space in resp->defdname. Truncate. */
break;
}
resp->dnsrch[i] = NULL;
}
/* The overlapping parts of both configurations should agree after
initialization. */
assert (resolv_conf_matches (resp, conf));

4
resolv/resolv_conf.h
View File

@ -35,6 +35,10 @@ struct resolv_conf
/* Reference counter. The object is deallocated once it reaches
zero. For internal use within resolv_conf only. */
size_t __refcount;
/* The domain names forming the search list. */
const char *const *search_list;
size_t search_list_size;
};
/* The functions below are for use by the res_init resolv.conf parser

19
resolv/resolv_context.h
View File

@ -93,6 +93,25 @@ struct resolv_context *__resolv_context_get_override (struct __res_state *)
__attribute__ ((nonnull (1), warn_unused_result));
libc_hidden_proto (__resolv_context_get_override)
/* Return the search path entry at INDEX, or NULL if there are fewer
than INDEX entries. */
static __attribute__ ((nonnull (1), unused)) const char *
__resolv_context_search_list (const struct resolv_context *ctx, size_t index)
{
if (ctx->conf != NULL)
{
if (index < ctx->conf->search_list_size)
return ctx->conf->search_list[index];
else
return NULL;
}
/* Fallback. ctx->resp->dnsrch is a NULL-terminated array. */
for (size_t i = 0; ctx->resp->dnsrch[i] != NULL && i < MAXDNSRCH; ++i)
if (i == index)
return ctx->resp->dnsrch[i];
return NULL;
}
/* Called during thread shutdown to free the associated resolver
context (mostly in response to cancellation, otherwise the
__resolv_context_get/__resolv_context_put pairing will already have

108
resolv/tst-resolv-res_init-skeleton.c
View File

@ -25,6 +25,7 @@
#include <gnu/lib-names.h>
#include <netdb.h>
#include <resolv/resolv-internal.h> /* For DEPRECATED_RES_USE_INET6. */
#include <resolv/resolv_context.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/capture_subprocess.h>
@ -116,6 +117,11 @@ print_option_flag (FILE *fp, int *options, int flag, const char *name)
static void
print_resp (FILE *fp, res_state resp)
{
struct resolv_context *ctx = __resolv_context_get_override (resp);
TEST_VERIFY_EXIT (ctx != NULL);
if (ctx->conf == NULL)
fprintf (fp, "; extended resolver state missing\n");
/* The options directive. */
{
/* RES_INIT is used internally for tracking initialization. */
@ -165,6 +171,19 @@ print_resp (FILE *fp, res_state resp)
else if (resp->defdname[0] != '\0')
fprintf (fp, "domain %s\n", resp->defdname);
/* The extended search path. */
{
size_t i = 0;
while (true)
{
const char *name = __resolv_context_search_list (ctx, i);
if (name == NULL)
break;
fprintf (fp, "; search[%zu]: %s\n", i, name);
++i;
}
}
/* The sortlist directive. */
if (resp->nsort > 0)
{
@ -224,6 +243,8 @@ print_resp (FILE *fp, res_state resp)
}
TEST_VERIFY (!ferror (fp));
__resolv_context_put (ctx);
}
/* Parameters of one test case. */
@ -368,11 +389,13 @@ struct test_case test_cases[] =
{.name = "empty file",
.conf = "",
.expected = "search example.com\n"
"; search[0]: example.com\n"
"nameserver 127.0.0.1\n"
},
{.name = "empty file with LOCALDOMAIN",
.conf = "",
.expected = "search example.net\n"
"; search[0]: example.net\n"
"nameserver 127.0.0.1\n",
.localdomain = "example.net",
},
@ -380,6 +403,7 @@ struct test_case test_cases[] =
.conf = "",
.expected = "options attempts:5 edns0\n"
"search example.com\n"
"; search[0]: example.com\n"
"nameserver 127.0.0.1\n",
.res_options = "edns0 attempts:5",
},
@ -387,6 +411,7 @@ struct test_case test_cases[] =
.conf = "",
.expected = "options attempts:5 edns0\n"
"search example.org\n"
"; search[0]: example.org\n"
"nameserver 127.0.0.1\n",
.localdomain = "example.org",
.res_options = "edns0 attempts:5",
@ -396,6 +421,8 @@ struct test_case test_cases[] =
"search corp.example.com example.com\n"
"nameserver 192.0.2.1\n",
.expected = "search corp.example.com example.com\n"
"; search[0]: corp.example.com\n"
"; search[1]: example.com\n"
"nameserver 192.0.2.1\n"
},
{.name = "whitespace",
@ -403,16 +430,46 @@ struct test_case test_cases[] =
" (trailing whitespace,\n"
"# missing newline at end of file).\n"
"\n"
"domain example.net\n"
";search commented out\n"
"search corp.example.com\texample.com\n"
"search corp.example.com\texample.com \n"
"#nameserver 192.0.2.3\n"
"nameserver 192.0.2.1 \n"
"nameserver 192.0.2.2", /* No \n at end of file. */
.expected = "search corp.example.com example.com\n"
"; search[0]: corp.example.com\n"
"; search[1]: example.com\n"
"nameserver 192.0.2.1\n"
"nameserver 192.0.2.2\n"
},
{.name = "domain",
.conf = "domain example.net\n"
"nameserver 192.0.2.1\n",
.expected = "search example.net\n"
"; search[0]: example.net\n"
"nameserver 192.0.2.1\n"
},
{.name = "domain space",
.conf = "domain example.net \n"
"nameserver 192.0.2.1\n",
.expected = "search example.net\n"
"; search[0]: example.net\n"
"nameserver 192.0.2.1\n"
},
{.name = "domain tab",
.conf = "domain example.net\t\n"
"nameserver 192.0.2.1\n",
.expected = "search example.net\n"
"; search[0]: example.net\n"
"nameserver 192.0.2.1\n"
},
{.name = "domain override",
.conf = "search example.com example.org\n"
"nameserver 192.0.2.1\n"
"domain example.net", /* No \n at end of file. */
.expected = "search example.net\n"
"; search[0]: example.net\n"
"nameserver 192.0.2.1\n"
},
{.name = "option values, multiple servers",
.conf = "options\tinet6\tndots:3 edns0\tattempts:5\ttimeout:19\n"
"domain example.net\n"
@ -423,6 +480,8 @@ struct test_case test_cases[] =
"nameserver 192.0.2.2\n",
.expected = "options ndots:3 timeout:19 attempts:5 inet6 edns0\n"
"search corp.example.com example.com\n"
"; search[0]: corp.example.com\n"
"; search[1]: example.com\n"
"nameserver 192.0.2.1\n"
"nameserver ::1\n"
"nameserver 192.0.2.2\n"
@ -432,6 +491,7 @@ struct test_case test_cases[] =
"search example.com\n",
.expected = "options ndots:15 timeout:30 attempts:5 use-vc\n"
"search example.com\n"
"; search[0]: example.com\n"
"nameserver 127.0.0.1\n"
},
{.name = "repeated directives",
@ -443,6 +503,7 @@ struct test_case test_cases[] =
"search\n",
.expected = "options ndots:2 use-vc edns0\n"
"search example.org\n"
"; search[0]: example.org\n"
"nameserver 127.0.0.1\n"
},
{.name = "many name servers, sortlist",
@ -459,6 +520,10 @@ struct test_case test_cases[] =
"nameserver 192.0.2.8\n",
.expected = "options single-request\n"
"search example.org example.com example.net corp.example.com\n"
"; search[0]: example.org\n"
"; search[1]: example.com\n"
"; search[2]: example.net\n"
"; search[3]: corp.example.com\n"
"sortlist 192.0.2.0/255.255.255.0\n"
"nameserver 192.0.2.1\n"
"nameserver 192.0.2.2\n"
@ -480,6 +545,11 @@ struct test_case test_cases[] =
.expected = "options single-request\n"
"search example.org example.com example.net corp.example.com"
" legacy.example.com\n"
"; search[0]: example.org\n"
"; search[1]: example.com\n"
"; search[2]: example.net\n"
"; search[3]: corp.example.com\n"
"; search[4]: legacy.example.com\n"
"sortlist 192.0.2.0/255.255.255.0\n"
"nameserver 192.0.2.1\n"
"nameserver 2001:db8::2\n"
@ -490,6 +560,7 @@ struct test_case test_cases[] =
"nameserver 192.0.2.2:5353\n"
"nameserver 192.0.2.3 5353\n",
.expected = "search example.com\n"
"; search[0]: example.com\n"
"nameserver 192.0.2.1\n"
"nameserver 192.0.2.3\n"
},
@ -498,9 +569,42 @@ struct test_case test_cases[] =
"nameserver 192.0.2.1\n",
.expected = "options ndots:3 timeout:7 attempts:5 use-vc edns0\n"
"search example.com\n"
"; search[0]: example.com\n"
"nameserver 192.0.2.1\n",
.res_options = "attempts:5 ndots:3 edns0 ",
},
{.name = "many search list entries (bug 19569)",
.conf = "nameserver 192.0.2.1\n"
"search corp.example.com support.example.com"
" community.example.org wan.example.net vpn.example.net"
" example.com example.org example.net\n",
.expected = "search corp.example.com support.example.com"
" community.example.org wan.example.net vpn.example.net example.com\n"
"; search[0]: corp.example.com\n"
"; search[1]: support.example.com\n"
"; search[2]: community.example.org\n"
"; search[3]: wan.example.net\n"
"; search[4]: vpn.example.net\n"
"; search[5]: example.com\n"
"; search[6]: example.org\n"
"; search[7]: example.net\n"
"nameserver 192.0.2.1\n",
},
{.name = "very long search list entries (bug 21475)",
.conf = "nameserver 192.0.2.1\n"
"search example.com "
#define H63 "this-host-name-is-longer-than-yours-yes-I-really-really-mean-it"
#define D63 "this-domain-name-is-as-long-as-the-previous-name--63-characters"
" " H63 "." D63 ".example.org"
" " H63 "." D63 ".example.net\n",
.expected = "search example.com " H63 "." D63 ".example.org\n"
"; search[0]: example.com\n"
"; search[1]: " H63 "." D63 ".example.org\n"
"; search[2]: " H63 "." D63 ".example.net\n"
#undef H63
#undef D63
"nameserver 192.0.2.1\n",
},
{ NULL }
};