Bug#157693: getaddrinfo() is buggy; resolution misses fields in /etc/hosts
On Sat, Sep 14, 2002 at 10:35:40PM +0900, GOTO Masanori wrote:
>
> Please retest after
>
> /etc/init.d/nscd stop
bash: /etc/init.d/nscd: No such file or directory
(nscd is not installed)
>
> Please see #160596 too. Do you think it's same problem ?
Yes. pacho.somedomain.com exists online; it resolves to 213.130.63.232.
pacho.<whatever his search domain is> probably doesn't exist; so:
pacho.<tld>. is not found in /etc/hosts
pacho.<tld>. is not found in global DNS
pacho is found in /etc/hosts; getaddrinfo() returns 127.0.0.1.
pacho.somedomain.com. is not found in /etc/hosts
pacho.somedomain.com. is found in global DNS; getaddrinfo() returns
213.130.63.232.
I'm not sure why he gets an invalid URL error, though; I get a
403-forbidden error.
[dilinger@pinky dilinger]$ ltrace -f w3m-en http://pacho.somedomain.com
2>&1 | grep pacho
getaddrinfo("pacho.somedomain.com", "80", 0xbffff988, 0xbffff980) = 0
strcasecmp("pacho.somedomain.com", "localhost") = 4
strcmp("http://pacho.somedomain.com/";, "http://pacho.somedomain.com/";) =
0
strcmp("http://pacho.somedomain.com/";, "http://pacho.somedomain.com/";) =
0
mozilla, otoh, doesn't use it (I couldn't run it through ltrace; after
10 minutes waiting for it to start up, i gave up):
http://lxr.mozilla.org/seamonkey/ident?i=getaddrinfo
http://lxr.mozilla.org/seamonkey/ident?i=gethostbyname
http://lxr.mozilla.org/seamonkey/ident?i=gethostbyaddr
> In addition your test program has no getaddrinfo.c.
> Send the complete test set.
As I mentioned, it's simply ripped from glibc, w/ a few
macros/definitions added to get it to compile; both files are attached.
>
> -- gotom
--
Buying a Unix machine guarantees you a descent into Hell. It starts when
you plug the computer in and it won't boot. Yes, they really did sell you
a $10,000 computer with an unformatted disk drive.
-- Philip Greenspun
#ifndef GAI_H_
#define GAI_H_
int
getaddrinfo_x (const char *name, const char *service,
const struct addrinfo *hints, struct addrinfo **pai);
void
freeaddrinfo_x (struct addrinfo *ai);
#endif
/* The Inner Net License, Version 2.00
The author(s) grant permission for redistribution and use in source and
binary forms, with or without modification, of the software and documentation
provided that the following conditions are met:
0. If you receive a version of the software that is specifically labelled
as not being for redistribution (check the version message and/or README),
you are not permitted to redistribute that version of the software in any
way or form.
1. All terms of the all other applicable copyrights and licenses must be
followed.
2. Redistributions of source code must retain the authors' copyright
notice(s), this list of conditions, and the following disclaimer.
3. Redistributions in binary form must reproduce the authors' copyright
notice(s), this list of conditions, and the following disclaimer in the
documentation and/or other materials provided with the distribution.
4. All advertising materials mentioning features or use of this software
must display the following acknowledgement with the name(s) of the
authors as specified in the copyright notice(s) substituted where
indicated:
This product includes software developed by <name(s)>, The Inner
Net, and other contributors.
5. Neither the name(s) of the author(s) nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY ITS AUTHORS AND CONTRIBUTORS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
If these license terms cause you a real problem, contact the author. */
/* This software is Copyright 1996 by Craig Metz, All Rights Reserved. */
#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <net/if.h>
#include "getaddrinfo.h"
#define GAIH_OKIFUNSPEC 0x0100
#define GAIH_EAI ~(GAIH_OKIFUNSPEC)
#ifndef UNIX_PATH_MAX
#define UNIX_PATH_MAX 108
#endif
#define __alloca(x) alloca((x))
#define SCOPE_DELIMITER '%'
# define __set_h_errno(x) (h_errno = (x))
struct gaih_service
{
const char *name;
int num;
};
struct gaih_servtuple
{
struct gaih_servtuple *next;
int socktype;
int protocol;
int port;
};
static const struct gaih_servtuple nullserv;
struct gaih_addrtuple
{
struct gaih_addrtuple *next;
int family;
char addr[16];
uint32_t scopeid;
};
struct gaih_typeproto
{
int socktype;
int protocol;
char name[4];
int protoflag;
};
/* Values for `protoflag'. */
#define GAI_PROTO_NOSERVICE 1
#define GAI_PROTO_PROTOANY 2
static const struct gaih_typeproto gaih_inet_typeproto[] =
{
{ 0, 0, "", 0 },
{ SOCK_STREAM, IPPROTO_TCP, "tcp", 0 },
{ SOCK_DGRAM, IPPROTO_UDP, "udp", 0 },
{ SOCK_RAW, 0, "raw", GAI_PROTO_PROTOANY|GAI_PROTO_NOSERVICE },
{ 0, 0, "", 0 }
};
struct gaih
{
int family;
int (*gaih)(const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai);
};
#if PF_UNSPEC == 0
static const struct addrinfo default_hints;
#else
static const struct addrinfo default_hints =
{ 0, PF_UNSPEC, 0, 0, 0, NULL, NULL, NULL };
#endif
static int
gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
const struct addrinfo *req, struct gaih_servtuple *st)
{
struct servent *s;
size_t tmpbuflen = 1024;
struct servent ts;
char *tmpbuf;
int r;
do
{
tmpbuf = __alloca (tmpbuflen);
printf (__FUNCTION__ "(): looking up '%s' via getservbyname_r.\n", servicename);
r = getservbyname_r (servicename, tp->name, &ts, tmpbuf, tmpbuflen,
&s);
if (r != 0 || s == NULL)
{
if (r == ERANGE)
tmpbuflen *= 2;
else
return GAIH_OKIFUNSPEC | -EAI_SERVICE;
}
}
while (r);
st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
? req->ai_protocol : tp->protocol);
st->port = s->s_port;
return 0;
}
#define gethosts(_family, _type, _name) \
{ \
int i, herrno; \
size_t tmpbuflen; \
struct hostent th; \
char *tmpbuf; \
tmpbuflen = 512; \
no_data = 0; \
do { \
tmpbuflen *= 2; \
tmpbuf = __alloca (tmpbuflen); \
printf (__FUNCTION__ "(): looking up '%s' via gethostbyname2_r.\n", _name); \
rc = gethostbyname2_r (_name, _family, &th, tmpbuf, \
tmpbuflen, &h, &herrno); \
} while (rc == ERANGE && herrno == NETDB_INTERNAL); \
if (rc != 0) \
{ \
succeeded--; \
if (herrno == NETDB_INTERNAL) \
{ \
__set_h_errno (herrno); \
return -EAI_SYSTEM; \
} \
if (herrno == TRY_AGAIN) \
no_data = EAI_AGAIN; \
else \
no_data = herrno == NO_DATA; \
} \
else if (h != NULL) \
{ \
for (i = 0; h->h_addr_list[i]; i++) \
{ \
if (*pat == NULL) { \
*pat = __alloca (sizeof(struct gaih_addrtuple)); \
(*pat)->scopeid = 0; \
} \
(*pat)->next = NULL; \
(*pat)->family = _family; \
memcpy ((*pat)->addr, h->h_addr_list[i], \
sizeof(_type)); \
pat = &((*pat)->next); \
} \
} \
}
/* If we are looking for both IPv4 and IPv6 address we don't
want the lookup functions to automatically promote IPv4
addresses to IPv6 addresses. Currently this is decided
by setting the RES_USE_INET6 bit in _res.options. */
#define tryname(__name) \
{ \
succeeded = req->ai_family == AF_UNSPEC ? 2 : 1; \
if (req->ai_family == AF_UNSPEC) \
_res.options &= ~RES_USE_INET6; \
if (req->ai_family == AF_UNSPEC || \
req->ai_family == AF_INET6) \
gethosts (AF_INET6, struct in6_addr, __name); \
no_inet6_data = no_data; \
if (req->ai_family == AF_UNSPEC) \
_res.options = old_res_options; \
if (req->ai_family == AF_UNSPEC || \
req->ai_family == AF_INET) \
gethosts (AF_INET, struct in_addr, __name); \
}
static int
gaih_inet (const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai)
{
const struct gaih_typeproto *tp = gaih_inet_typeproto;
struct gaih_servtuple *st = (struct gaih_servtuple *) &nullserv;
struct gaih_addrtuple *at = NULL;
int rc;
printf (__FUNCTION__ "(): entered.\n");
/* Make sure we are initialized now */
if (!(_res.options & RES_INIT))
res_ninit(&_res);
if (req->ai_protocol || req->ai_socktype)
{
++tp;
while (tp->name[0]
&& ((req->ai_socktype != 0 && req->ai_socktype != tp->socktype)
|| (req->ai_protocol != 0
&& !(tp->protoflag & GAI_PROTO_PROTOANY)
&& req->ai_protocol != tp->protocol)))
++tp;
if (! tp->name[0])
{
if (req->ai_socktype)
return (GAIH_OKIFUNSPEC | -EAI_SOCKTYPE);
else
return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
}
}
if (service != NULL)
{
if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
if (service->num < 0)
{
if (tp->name[0])
{
st = (struct gaih_servtuple *)
__alloca (sizeof (struct gaih_servtuple));
if ((rc = gaih_inet_serv (service->name, tp, req, st)))
return rc;
}
else
{
struct gaih_servtuple **pst = &st;
for (tp++; tp->name[0]; tp++)
{
struct gaih_servtuple *newp;
if ((tp->protoflag & GAI_PROTO_NOSERVICE) != 0)
continue;
if (req->ai_socktype != 0
&& req->ai_socktype != tp->socktype)
continue;
if (req->ai_protocol != 0
&& !(tp->protoflag & GAI_PROTO_PROTOANY)
&& req->ai_protocol != tp->protocol)
continue;
newp = (struct gaih_servtuple *)
__alloca (sizeof (struct gaih_servtuple));
if ((rc = gaih_inet_serv (service->name, tp, req, newp)))
{
if (rc & GAIH_OKIFUNSPEC)
continue;
return rc;
}
*pst = newp;
pst = &(newp->next);
}
if (st == (struct gaih_servtuple *) &nullserv)
return (GAIH_OKIFUNSPEC | -EAI_SERVICE);
}
}
else
{
st = __alloca (sizeof (struct gaih_servtuple));
st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
? req->ai_protocol : tp->protocol);
st->port = htons (service->num);
}
}
else if (req->ai_socktype || req->ai_protocol)
{
st = __alloca (sizeof (struct gaih_servtuple));
st->next = NULL;
st->socktype = tp->socktype;
st->protocol = ((tp->protoflag & GAI_PROTO_PROTOANY)
? req->ai_protocol : tp->protocol);
st->port = 0;
}
else
{
/* Neither socket type nor protocol is set. Return all socket types
we know about. */
struct gaih_servtuple **lastp = &st;
for (++tp; tp->name[0]; ++tp)
{
struct gaih_servtuple *newp;
newp = __alloca (sizeof (struct gaih_servtuple));
newp->next = NULL;
newp->socktype = tp->socktype;
newp->protocol = tp->protocol;
newp->port = 0;
*lastp = newp;
lastp = &newp->next;
}
}
if (name != NULL)
{
at = __alloca (sizeof (struct gaih_addrtuple));
at->family = AF_UNSPEC;
at->scopeid = 0;
at->next = NULL;
if (inet_pton (AF_INET, name, at->addr) > 0)
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET)
at->family = AF_INET;
else
return -EAI_ADDRFAMILY;
}
if (at->family == AF_UNSPEC)
{
char *namebuf = strdup (name);
char *scope_delim;
scope_delim = strchr (namebuf, SCOPE_DELIMITER);
if (scope_delim != NULL)
*scope_delim = '\0';
if (inet_pton (AF_INET6, namebuf, at->addr) > 0)
{
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)
at->family = AF_INET6;
else
return -EAI_ADDRFAMILY;
if (scope_delim != NULL)
{
int try_numericscope = 0;
if (IN6_IS_ADDR_LINKLOCAL (at->addr)
|| IN6_IS_ADDR_MC_LINKLOCAL (at->addr))
{
at->scopeid = if_nametoindex (scope_delim + 1);
if (at->scopeid == 0)
try_numericscope = 1;
}
else
try_numericscope = 1;
if (try_numericscope != 0)
{
char *end;
assert (sizeof (uint32_t) <= sizeof (unsigned long));
at->scopeid = (uint32_t) strtoul (scope_delim + 1, &end,
10);
if (*end != '\0')
return GAIH_OKIFUNSPEC | -EAI_NONAME;
}
}
}
}
if (at->family == AF_UNSPEC && (req->ai_flags & AI_NUMERICHOST) == 0)
{
struct hostent *h;
struct gaih_addrtuple **pat = &at;
int no_data = 0;
int no_inet6_data;
int succeeded = -1;
int old_res_options = _res.options;
/* If we have a dotted name, first try an absolute lookup. This
avoids problem where the resolver will try to search domains
even though we may have a fqdn, which is bad since ipv6 lookups
are performed first. */
if (strchr(name, '.') != NULL)
{
int namelen = strlen(name);
char *newname = __alloca(namelen + 2);
strcpy(newname, name);
newname[namelen] = '.';
newname[namelen+1] = '\0';
tryname(newname);
}
/* If the previous didn't work, or we don't have a dotted name,
we try again like normal, letting the resolver manage domain
searching. */
if (succeeded <= 0)
{
_res.options = old_res_options;
if (succeeded == 0) /* we've tried absolute, now try searches */
_res.ndots = 99;
tryname(name);
if (no_data != 0 && no_inet6_data != 0)
{
/* If both requests timed out report this. */
if (no_data == EAI_AGAIN && no_inet6_data == EAI_AGAIN)
return -EAI_AGAIN;
/* We made requests but they turned out no data. The name
is known, though. */
return (GAIH_OKIFUNSPEC | -EAI_NODATA);
}
}
}
if (at->family == AF_UNSPEC)
return (GAIH_OKIFUNSPEC | -EAI_NONAME);
}
else
{
struct gaih_addrtuple *atr;
atr = at = __alloca (sizeof (struct gaih_addrtuple));
memset (at, '\0', sizeof (struct gaih_addrtuple));
if (req->ai_family == 0)
{
at->next = __alloca (sizeof (struct gaih_addrtuple));
memset (at->next, '\0', sizeof (struct gaih_addrtuple));
}
if (req->ai_family == 0 || req->ai_family == AF_INET6)
{
at->family = AF_INET6;
if ((req->ai_flags & AI_PASSIVE) == 0)
memcpy (at->addr, &in6addr_loopback, sizeof (struct in6_addr));
atr = at->next;
}
if (req->ai_family == 0 || req->ai_family == AF_INET)
{
atr->family = AF_INET;
if ((req->ai_flags & AI_PASSIVE) == 0)
*(uint32_t *) atr->addr = htonl (INADDR_LOOPBACK);
}
}
if (pai == NULL)
return 0;
{
const char *c = NULL;
struct gaih_servtuple *st2;
struct gaih_addrtuple *at2 = at;
size_t socklen, namelen;
sa_family_t family;
/*
buffer is the size of an unformatted IPv6 address in printable format.
*/
char buffer[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"];
while (at2 != NULL)
{
if (req->ai_flags & AI_CANONNAME)
{
struct hostent *h = NULL;
int herrno;
struct hostent th;
size_t tmpbuflen = 512;
char *tmpbuf;
do
{
tmpbuflen *= 2;
tmpbuf = __alloca (tmpbuflen);
if (tmpbuf == NULL)
return -EAI_MEMORY;
printf (__FUNCTION__ "(): looking up '%s' via gethostbyaddr_r.\n", at2->addr);
rc = gethostbyaddr_r (at2->addr,
((at2->family == AF_INET6)
? sizeof(struct in6_addr)
: sizeof(struct in_addr)),
at2->family, &th, tmpbuf, tmpbuflen,
&h, &herrno);
}
while (rc == errno && herrno == NETDB_INTERNAL);
if (rc != 0 && herrno == NETDB_INTERNAL)
{
__set_h_errno (herrno);
return -EAI_SYSTEM;
}
if (h == NULL)
c = inet_ntop (at2->family, at2->addr, buffer, sizeof(buffer));
else
c = h->h_name;
if (c == NULL)
return GAIH_OKIFUNSPEC | -EAI_NONAME;
namelen = strlen (c) + 1;
}
else
namelen = 0;
if (at2->family == AF_INET6)
{
family = AF_INET6;
socklen = sizeof (struct sockaddr_in6);
}
else
{
family = AF_INET;
socklen = sizeof (struct sockaddr_in);
}
for (st2 = st; st2 != NULL; st2 = st2->next)
{
*pai = malloc (sizeof (struct addrinfo) + socklen + namelen);
if (*pai == NULL)
return -EAI_MEMORY;
(*pai)->ai_flags = req->ai_flags;
(*pai)->ai_family = family;
(*pai)->ai_socktype = st2->socktype;
(*pai)->ai_protocol = st2->protocol;
(*pai)->ai_addrlen = socklen;
(*pai)->ai_addr = (void *) (*pai) + sizeof(struct addrinfo);
#if SALEN
(*pai)->ai_addr->sa_len = socklen;
#endif /* SALEN */
(*pai)->ai_addr->sa_family = family;
if (family == AF_INET6)
{
struct sockaddr_in6 *sin6p =
(struct sockaddr_in6 *) (*pai)->ai_addr;
sin6p->sin6_flowinfo = 0;
memcpy (&sin6p->sin6_addr,
at2->addr, sizeof (struct in6_addr));
sin6p->sin6_port = st2->port;
sin6p->sin6_scope_id = at2->scopeid;
}
else
{
struct sockaddr_in *sinp =
(struct sockaddr_in *) (*pai)->ai_addr;
memcpy (&sinp->sin_addr,
at2->addr, sizeof (struct in_addr));
sinp->sin_port = st2->port;
memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
}
if (c)
{
(*pai)->ai_canonname = ((void *) (*pai) +
sizeof (struct addrinfo) + socklen);
strcpy ((*pai)->ai_canonname, c);
}
else
(*pai)->ai_canonname = NULL;
(*pai)->ai_next = NULL;
pai = &((*pai)->ai_next);
}
at2 = at2->next;
}
}
return 0;
}
static struct gaih gaih[] =
{
{ PF_INET6, gaih_inet },
{ PF_INET, gaih_inet },
#if 0
{ PF_LOCAL, gaih_local },
#endif
{ PF_UNSPEC, NULL }
};
int
getaddrinfo_x (const char *name, const char *service,
const struct addrinfo *hints, struct addrinfo **pai)
{
int i = 0, j = 0, last_i = 0;
struct addrinfo *p = NULL, **end;
struct gaih *g = gaih, *pg = NULL;
struct gaih_service gaih_service, *pservice;
if (name != NULL && name[0] == '*' && name[1] == 0)
name = NULL;
if (service != NULL && service[0] == '*' && service[1] == 0)
service = NULL;
if (name == NULL && service == NULL)
return EAI_NONAME;
if (hints == NULL)
hints = &default_hints;
if (hints->ai_flags & ~(AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST))
return EAI_BADFLAGS;
if ((hints->ai_flags & AI_CANONNAME) && name == NULL)
return EAI_BADFLAGS;
if (service && service[0])
{
char *c;
gaih_service.name = service;
gaih_service.num = strtoul (gaih_service.name, &c, 10);
if (*c)
gaih_service.num = -1;
else
/* Can't specify a numerical socket unless a protocol family was
given. */
if (hints->ai_socktype == 0 && hints->ai_protocol == 0)
return EAI_SERVICE;
pservice = &gaih_service;
}
else
pservice = NULL;
if (pai)
end = &p;
else
end = NULL;
while (g->gaih)
{
if (hints->ai_family == g->family || hints->ai_family == AF_UNSPEC)
{
j++;
if (pg == NULL || pg->gaih != g->gaih)
{
pg = g;
i = g->gaih (name, pservice, hints, end);
if (i != 0)
{
/* EAI_NODATA is a more specific result as it says that
we found a result but it is not usable. */
if (last_i != (GAIH_OKIFUNSPEC | -EAI_NODATA))
last_i = i;
if (hints->ai_family == AF_UNSPEC && (i & GAIH_OKIFUNSPEC))
continue;
if (p)
freeaddrinfo_x (p);
return -(i & GAIH_EAI);
}
if (end)
while(*end) end = &((*end)->ai_next);
}
}
++g;
}
if (j == 0)
return EAI_FAMILY;
if (p)
{
*pai = p;
return 0;
}
if (pai == NULL && last_i == 0)
return 0;
if (p)
freeaddrinfo_x (p);
return last_i ? -(last_i & GAIH_EAI) : EAI_NONAME;
}
void
freeaddrinfo_x (struct addrinfo *ai)
{
struct addrinfo *p;
while (ai != NULL)
{
p = ai;
ai = ai->ai_next;
free (p);
}
}
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