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4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 | /* resolv.c: DNS Resolver
*
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
* The Silver Hammer Group, Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*/
/*
* Portions Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University 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 THE REGENTS 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 REGENTS 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.
*/
/*
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/*
* Portions Copyright (c) 1996-1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*/
/* RFC 1035
...
Whenever an octet represents a numeric quantity, the left most bit
in the diagram is the high order or most significant bit.
That is, the bit labeled 0 is the most significant bit.
...
4.1.1. Header section format
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ID |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|QR| OPCODE |AA|TC|RD|RA| 0 0 0| RCODE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QDCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ANCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| NSCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ARCOUNT |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
ID 16 bit random identifier assigned by querying peer.
Used to match query/response.
QR message is a query (0), or a response (1).
OPCODE 0 standard query (QUERY)
1 inverse query (IQUERY)
2 server status request (STATUS)
AA Authoritative Answer - this bit is valid in responses.
Responding name server is an authority for the domain name
in question section. Answer section may have multiple owner names
because of aliases. The AA bit corresponds to the name which matches
the query name, or the first owner name in the answer section.
TC TrunCation - this message was truncated.
RD Recursion Desired - this bit may be set in a query and
is copied into the response. If RD is set, it directs
the name server to pursue the query recursively.
Recursive query support is optional.
RA Recursion Available - this be is set or cleared in a
response, and denotes whether recursive query support is
available in the name server.
RCODE Response code.
0 No error condition
1 Format error
2 Server failure - server was unable to process the query
due to a problem with the name server.
3 Name Error - meaningful only for responses from
an authoritative name server. The referenced domain name
does not exist.
4 Not Implemented.
5 Refused.
QDCOUNT number of entries in the question section.
ANCOUNT number of records in the answer section.
NSCOUNT number of records in the authority records section.
ARCOUNT number of records in the additional records section.
4.1.2. Question section format
The section contains QDCOUNT (usually 1) entries, each of this format:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ QNAME /
/ /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QTYPE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| QCLASS |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
QNAME a domain name represented as a sequence of labels, where
each label consists of a length octet followed by that
number of octets. The domain name terminates with the
zero length octet for the null label of the root. Note
that this field may be an odd number of octets; no
padding is used.
QTYPE a two octet type of the query.
1 a host address [REQ_A const]
2 an authoritative name server
3 a mail destination (Obsolete - use MX)
4 a mail forwarder (Obsolete - use MX)
5 the canonical name for an alias
6 marks the start of a zone of authority
7 a mailbox domain name (EXPERIMENTAL)
8 a mail group member (EXPERIMENTAL)
9 a mail rename domain name (EXPERIMENTAL)
10 a null RR (EXPERIMENTAL)
11 a well known service description
12 a domain name pointer [REQ_PTR const]
13 host information
14 mailbox or mail list information
15 mail exchange
16 text strings
0x1c IPv6?
252 a request for a transfer of an entire zone
253 a request for mailbox-related records (MB, MG or MR)
254 a request for mail agent RRs (Obsolete - see MX)
255 a request for all records
QCLASS a two octet code that specifies the class of the query.
1 the Internet
(others are historic only)
255 any class
4.1.3. Resource record format
The answer, authority, and additional sections all share the same format:
a variable number of resource records, where the number of records
is specified in the corresponding count field in the header.
Each resource record has this format:
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ /
/ NAME /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| TYPE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| CLASS |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| TTL |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| RDLENGTH |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|
/ RDATA /
/ /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
NAME a domain name to which this resource record pertains.
TYPE two octets containing one of the RR type codes. This
field specifies the meaning of the data in the RDATA field.
CLASS two octets which specify the class of the data in the RDATA field.
TTL a 32 bit unsigned integer that specifies the time interval
(in seconds) that the record may be cached.
RDLENGTH a 16 bit integer, length in octets of the RDATA field.
RDATA a variable length string of octets that describes the resource.
The format of this information varies according to the TYPE
and CLASS of the resource record.
If the TYPE is A and the CLASS is IN, it's a 4 octet IP address.
4.1.4. Message compression
In order to reduce the size of messages, domain names can be compressed.
An entire domain name or a list of labels at the end of a domain name
is replaced with a pointer to a prior occurance of the same name.
The pointer takes the form of a two octet sequence:
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| 1 1| OFFSET |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
The first two bits are ones. This allows a pointer to be distinguished
from a label, since the label must begin with two zero bits because
labels are restricted to 63 octets or less. The OFFSET field specifies
an offset from the start of the message (i.e., the first octet
of the ID field in the domain header).
A zero offset specifies the first byte of the ID field, etc.
Domain name in a message can be represented as either:
- a sequence of labels ending in a zero octet
- a pointer
- a sequence of labels ending with a pointer
*/
#include <string.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <signal.h>
#include <malloc.h>
#include <errno.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <resolv.h>
#include <netdb.h>
#include <ctype.h>
#include <stdbool.h>
#include <time.h>
#include <arpa/nameser.h>
#include <sys/utsname.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <bits/uClibc_mutex.h>
#include "internal/parse_config.h"
/* poll() is not supported in kernel <= 2.0, therefore if __NR_poll is
* not available, we assume an old Linux kernel is in use and we will
* use select() instead. */
#include <sys/syscall.h>
#ifndef __NR_poll
# define USE_SELECT
#endif
#if defined __UCLIBC_HAS_IPV4__ && defined __UCLIBC_HAS_IPV6__
#define IF_HAS_BOTH(...) __VA_ARGS__
#else
#define IF_HAS_BOTH(...)
#endif
#define MAX_RECURSE 5
#define MAXALIASES (4)
/* 1:ip + 1:full + MAX_ALIASES:aliases + 1:NULL */
#define ALIAS_DIM (2 + MAXALIASES + 1)
#define BUFSZ (80) /* one line */
#define NS_TYPE_ELT 0x40 /*%< EDNS0 extended label type */
#define DNS_LABELTYPE_BITSTRING 0x41
#undef DEBUG
/* #define DEBUG */
#ifdef DEBUG
#define DPRINTF(X,args...) fprintf(stderr, X, ##args)
#else
#define DPRINTF(X,args...)
#endif
/* Make sure the incoming char * buffer is aligned enough to handle our random
* structures. This define is the same as we use for malloc alignment (which
* has same requirements). The offset is the number of bytes we need to adjust
* in order to attain desired alignment.
*/
#define ALIGN_ATTR __alignof__(double __attribute_aligned__ (sizeof(size_t)))
#define ALIGN_BUFFER_OFFSET(buf) ((ALIGN_ATTR - ((size_t)buf % ALIGN_ATTR)) % ALIGN_ATTR)
/* Structs */
struct resolv_header {
int id;
int qr, opcode, aa, tc, rd, ra, rcode;
int qdcount;
int ancount;
int nscount;
int arcount;
};
struct resolv_question {
char *dotted;
int qtype;
int qclass;
};
struct resolv_answer {
char *dotted;
int atype;
int aclass;
int ttl;
int rdlength;
const unsigned char *rdata;
int rdoffset;
char* buf;
size_t buflen;
size_t add_count;
};
enum etc_hosts_action {
GET_HOSTS_BYNAME = 0,
GETHOSTENT,
GET_HOSTS_BYADDR,
};
typedef union sockaddr46_t {
struct sockaddr sa;
#ifdef __UCLIBC_HAS_IPV4__
struct sockaddr_in sa4;
#endif
#ifdef __UCLIBC_HAS_IPV6__
struct sockaddr_in6 sa6;
#endif
} sockaddr46_t;
__UCLIBC_MUTEX_EXTERN(__resolv_lock) attribute_hidden;
/* Protected by __resolv_lock */
extern void (*__res_sync)(void) attribute_hidden;
/*extern uint32_t __resolv_opts attribute_hidden; */
extern uint8_t __resolv_timeout attribute_hidden;
extern uint8_t __resolv_attempts attribute_hidden;
extern unsigned __nameservers attribute_hidden;
extern unsigned __searchdomains attribute_hidden;
extern sockaddr46_t *__nameserver attribute_hidden;
extern char **__searchdomain attribute_hidden;
#ifdef __UCLIBC_HAS_IPV4__
extern const struct sockaddr_in __local_nameserver attribute_hidden;
#else
extern const struct sockaddr_in6 __local_nameserver attribute_hidden;
#endif
/* Arbitrary */
#define MAXLEN_searchdomain 128
/* prototypes for internal functions */
extern void endhostent_unlocked(void) attribute_hidden;
extern int __get_hosts_byname_r(const char *name,
int type,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop) attribute_hidden;
extern int __get_hosts_byaddr_r(const char *addr,
int len,
int type,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop) attribute_hidden;
extern parser_t *__open_etc_hosts(void) attribute_hidden;
extern int __read_etc_hosts_r(parser_t *parser,
const char *name,
int type,
enum etc_hosts_action action,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop) attribute_hidden;
extern int __dns_lookup(const char *name,
int type,
unsigned char **outpacket,
struct resolv_answer *a) attribute_hidden;
extern int __encode_dotted(const char *dotted,
unsigned char *dest,
int maxlen) attribute_hidden;
extern int __decode_dotted(const unsigned char *packet,
int offset,
int packet_len,
char *dest,
int dest_len) attribute_hidden;
extern int __encode_header(struct resolv_header *h,
unsigned char *dest,
int maxlen) attribute_hidden;
extern void __decode_header(unsigned char *data,
struct resolv_header *h) attribute_hidden;
extern int __encode_question(const struct resolv_question *q,
unsigned char *dest,
int maxlen) attribute_hidden;
extern int __encode_answer(struct resolv_answer *a,
unsigned char *dest,
int maxlen) attribute_hidden;
extern void __open_nameservers(void) attribute_hidden;
extern void __close_nameservers(void) attribute_hidden;
/*
* Theory of operation.
*
* gethostbyname, getaddrinfo and friends end up here, and they sometimes
* need to talk to DNS servers. In order to do this, we need to read /etc/resolv.conf
* and determine servers' addresses and the like. resolv.conf format:
*
* nameserver <IP[v6]>
* Address of DNS server. Cumulative.
* If not specified, assumed to be on localhost.
* search <domain1>[ <domain2>]...
* Append these domains to unqualified names.
* See ndots:n option.
* $LOCALDOMAIN (space-separated list) overrides this.
* domain <domain>
* Effectively same as "search" with one domain.
* If no "domain" line is present, the domain is determined
* from the local host name returned by gethostname();
* the domain part is taken to be everything after the first dot.
* If there are no dots, there will be no "domain".
* The domain and search keywords are mutually exclusive.
* If more than one instance of these keywords is present,
* the last instance wins.
* sortlist 130.155.160.0[/255.255.240.0] 130.155.0.0
* Allows addresses returned by gethostbyname to be sorted.
* Not supported.
* options option[ option]...
* (so far we support timeout:n and attempts:n)
* $RES_OPTIONS (space-separated list) is to be added to "options"
* debug sets RES_DEBUG in _res.options
* ndots:n how many dots there should be so that name will be tried
* first as an absolute name before any search list elements
* are appended to it. Default 1
* timeout:n how long to wait for response. Default 5
* (sun seems to have retrans:n synonym)
* attempts:n number of rounds to do before giving up and returning
* an error. Default 2
* (sun seems to have retry:n synonym)
* rotate sets RES_ROTATE in _res.options, round robin
* selection of nameservers. Otherwise try
* the first listed server first every time
* no-check-names
* sets RES_NOCHECKNAME in _res.options, which disables
* checking of incoming host names for invalid characters
* such as underscore (_), non-ASCII, or control characters
* inet6 sets RES_USE_INET6 in _res.options. Try a AAAA query
* before an A query inside the gethostbyname(), and map
* IPv4 responses in IPv6 "tunnelled form" if no AAAA records
* are found but an A record set exists
* no_tld_query (FreeBSDism?)
* do not attempt to resolve names without dots
*
* We will read and analyze /etc/resolv.conf as needed before
* we do a DNS request. This happens in __dns_lookup.
* It is reread if its mtime is changed.
*
* BSD has res_init routine which is used to initialize resolver state
* which is held in global structure _res.
* Generally, programs call res_init, then fiddle with _res.XXX
* (_res.options and _res.nscount, _res.nsaddr_list[N]
* are popular targets of fiddling) and expect subsequent calls
* to gethostbyname, getaddrinfo, etc to use modified information.
*
* However, historical _res structure is quite awkward.
* Using it for storing /etc/resolv.conf info is not desirable,
* and __dns_lookup does not use it.
*
* We would like to avoid using it unless absolutely necessary.
* If user doesn't use res_init, we should arrange it so that
* _res structure doesn't even *get linked in* into user's application
* (imagine static uclibc build here).
*
* The solution is a __res_sync function pointer, which is normally NULL.
* But if res_init is called, it gets set and any subsequent gethostbyname
* et al "syncronizes" our internal structures with potentially
* modified _res.XXX stuff by calling __res_sync.
* The trick here is that if res_init is not used and not linked in,
* gethostbyname itself won't reference _res and _res won't be linked in
* either. Other possible methods like
* if (__res_sync_just_an_int_flag)
* __sync_me_with_res()
* would pull in __sync_me_with_res, which pulls in _res. Bad.
*/
#ifdef L_encodeh
int __encode_header(struct resolv_header *h, unsigned char *dest, int maxlen)
{
if (maxlen < HFIXEDSZ)
return -1;
dest[0] = (h->id & 0xff00) >> 8;
dest[1] = (h->id & 0x00ff) >> 0;
dest[2] = (h->qr ? 0x80 : 0) |
((h->opcode & 0x0f) << 3) |
(h->aa ? 0x04 : 0) |
(h->tc ? 0x02 : 0) |
(h->rd ? 0x01 : 0);
dest[3] = (h->ra ? 0x80 : 0) | (h->rcode & 0x0f);
dest[4] = (h->qdcount & 0xff00) >> 8;
dest[5] = (h->qdcount & 0x00ff) >> 0;
dest[6] = (h->ancount & 0xff00) >> 8;
dest[7] = (h->ancount & 0x00ff) >> 0;
dest[8] = (h->nscount & 0xff00) >> 8;
dest[9] = (h->nscount & 0x00ff) >> 0;
dest[10] = (h->arcount & 0xff00) >> 8;
dest[11] = (h->arcount & 0x00ff) >> 0;
return HFIXEDSZ;
}
#endif /* L_encodeh */
#ifdef L_decodeh
void __decode_header(unsigned char *data,
struct resolv_header *h)
{
h->id = (data[0] << 8) | data[1];
h->qr = (data[2] & 0x80) ? 1 : 0;
h->opcode = (data[2] >> 3) & 0x0f;
h->aa = (data[2] & 0x04) ? 1 : 0;
h->tc = (data[2] & 0x02) ? 1 : 0;
h->rd = (data[2] & 0x01) ? 1 : 0;
h->ra = (data[3] & 0x80) ? 1 : 0;
h->rcode = data[3] & 0x0f;
h->qdcount = (data[4] << 8) | data[5];
h->ancount = (data[6] << 8) | data[7];
h->nscount = (data[8] << 8) | data[9];
h->arcount = (data[10] << 8) | data[11];
}
#endif /* L_decodeh */
#ifdef L_encoded
/* Encode a dotted string into nameserver transport-level encoding.
This routine is fairly dumb, and doesn't attempt to compress
the data */
int __encode_dotted(const char *dotted, unsigned char *dest, int maxlen)
{
unsigned used = 0;
while (dotted && *dotted) {
char *c = strchr(dotted, '.');
int l = c ? c - dotted : strlen(dotted);
/* two consecutive dots are not valid */
if (l == 0)
return -1;
if (l >= (maxlen - used - 1))
return -1;
dest[used++] = l;
memcpy(dest + used, dotted, l);
used += l;
if (!c)
break;
dotted = c + 1;
}
if (maxlen < 1)
return -1;
dest[used++] = 0;
return used;
}
#endif /* L_encoded */
#ifdef L_decoded
/* Decode a dotted string from nameserver transport-level encoding.
This routine understands compressed data. */
int __decode_dotted(const unsigned char *packet,
int offset,
int packet_len,
char *dest,
int dest_len)
{
unsigned b;
bool measure = 1;
unsigned total = 0;
unsigned used = 0;
unsigned maxiter = 256;
if (!packet)
return -1;
dest[0] = '\0';
while (--maxiter) {
if (offset >= packet_len)
return -1;
b = packet[offset++];
if (b == 0)
break;
if (measure)
total++;
if ((b & 0xc0) == 0xc0) {
if (offset >= packet_len)
return -1;
if (measure)
total++;
/* compressed item, redirect */
offset = ((b & 0x3f) << 8) | packet[offset];
measure = 0;
continue;
}
if (used + b + 1 >= dest_len)
return -1;
if (offset + b >= packet_len)
return -1;
memcpy(dest + used, packet + offset, b);
offset += b;
used += b;
if (measure)
total += b;
if (packet[offset] != 0)
dest[used++] = '.';
else
dest[used++] = '\0';
}
if (!maxiter)
return -1;
/* The null byte must be counted too */
if (measure)
total++;
DPRINTF("Total decode len = %d\n", total);
return total;
}
#endif /* L_decoded */
#ifdef L_encodeq
int __encode_question(const struct resolv_question *q,
unsigned char *dest,
int maxlen)
{
int i;
i = __encode_dotted(q->dotted, dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
if (maxlen < 4)
return -1;
dest[0] = (q->qtype & 0xff00) >> 8;
dest[1] = (q->qtype & 0x00ff) >> 0;
dest[2] = (q->qclass & 0xff00) >> 8;
dest[3] = (q->qclass & 0x00ff) >> 0;
return i + 4;
}
#endif /* L_encodeq */
#ifdef L_encodea
int __encode_answer(struct resolv_answer *a, unsigned char *dest, int maxlen)
{
int i;
i = __encode_dotted(a->dotted, dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
if (maxlen < (RRFIXEDSZ + a->rdlength))
return -1;
*dest++ = (a->atype & 0xff00) >> 8;
*dest++ = (a->atype & 0x00ff) >> 0;
*dest++ = (a->aclass & 0xff00) >> 8;
*dest++ = (a->aclass & 0x00ff) >> 0;
*dest++ = (a->ttl & 0xff000000) >> 24;
*dest++ = (a->ttl & 0x00ff0000) >> 16;
*dest++ = (a->ttl & 0x0000ff00) >> 8;
*dest++ = (a->ttl & 0x000000ff) >> 0;
*dest++ = (a->rdlength & 0xff00) >> 8;
*dest++ = (a->rdlength & 0x00ff) >> 0;
memcpy(dest, a->rdata, a->rdlength);
return i + RRFIXEDSZ + a->rdlength;
}
#endif /* L_encodea */
#ifdef CURRENTLY_UNUSED
#ifdef L_encodep
int __encode_packet(struct resolv_header *h,
struct resolv_question **q,
struct resolv_answer **an,
struct resolv_answer **ns,
struct resolv_answer **ar,
unsigned char *dest, int maxlen) attribute_hidden;
int __encode_packet(struct resolv_header *h,
struct resolv_question **q,
struct resolv_answer **an,
struct resolv_answer **ns,
struct resolv_answer **ar,
unsigned char *dest, int maxlen)
{
int i, total = 0;
unsigned j;
i = __encode_header(h, dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
total += i;
for (j = 0; j < h->qdcount; j++) {
i = __encode_question(q[j], dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
total += i;
}
for (j = 0; j < h->ancount; j++) {
i = __encode_answer(an[j], dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
total += i;
}
for (j = 0; j < h->nscount; j++) {
i = __encode_answer(ns[j], dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
total += i;
}
for (j = 0; j < h->arcount; j++) {
i = __encode_answer(ar[j], dest, maxlen);
if (i < 0)
return i;
dest += i;
maxlen -= i;
total += i;
}
return total;
}
#endif /* L_encodep */
#ifdef L_decodep
int __decode_packet(unsigned char *data, struct resolv_header *h) attribute_hidden;
int __decode_packet(unsigned char *data, struct resolv_header *h)
{
__decode_header(data, h);
return HFIXEDSZ;
}
#endif /* L_decodep */
#ifdef L_formquery
int __form_query(int id,
const char *name,
int type,
unsigned char *packet,
int maxlen) attribute_hidden;
int __form_query(int id,
const char *name,
int type,
unsigned char *packet,
int maxlen)
{
struct resolv_header h;
struct resolv_question q;
int i, j;
memset(&h, 0, sizeof(h));
h.id = id;
h.qdcount = 1;
q.dotted = (char *) name;
q.qtype = type;
q.qclass = C_IN; /* CLASS_IN */
i = __encode_header(&h, packet, maxlen);
if (i < 0)
return i;
j = __encode_question(&q, packet + i, maxlen - i);
if (j < 0)
return j;
return i + j;
}
#endif /* L_formquery */
#endif /* CURRENTLY_UNUSED */
#ifdef L_opennameservers
# if __BYTE_ORDER == __LITTLE_ENDIAN
#define NAMESERVER_PORT_N (__bswap_constant_16(NAMESERVER_PORT))
#else
#define NAMESERVER_PORT_N NAMESERVER_PORT
#endif
__UCLIBC_MUTEX_INIT(__resolv_lock, PTHREAD_MUTEX_INITIALIZER);
/* Protected by __resolv_lock */
void (*__res_sync)(void);
/*uint32_t __resolv_opts; */
uint8_t __resolv_timeout = RES_TIMEOUT;
uint8_t __resolv_attempts = RES_DFLRETRY;
unsigned __nameservers;
unsigned __searchdomains;
sockaddr46_t *__nameserver;
char **__searchdomain;
#ifdef __UCLIBC_HAS_IPV4__
const struct sockaddr_in __local_nameserver = {
.sin_family = AF_INET,
.sin_port = NAMESERVER_PORT_N,
};
#else
const struct sockaddr_in6 __local_nameserver = {
.sin6_family = AF_INET6,
.sin6_port = NAMESERVER_PORT_N,
};
#endif
/* Helpers. Both stop on EOL, if it's '\n', it is converted to NUL first */
static char *skip_nospace(char *p)
{
while (*p != '\0' && !isspace(*p)) {
if (*p == '\n') {
*p = '\0';
break;
}
p++;
}
return p;
}
static char *skip_and_NUL_space(char *p)
{
/* NB: '\n' is not isspace! */
while (1) {
char c = *p;
if (c == '\0' || !isspace(c))
break;
*p = '\0';
if (c == '\n' || c == '#')
break;
p++;
}
return p;
}
/* Must be called under __resolv_lock. */
void __open_nameservers(void)
{
static uint32_t resolv_conf_mtime;
char szBuffer[MAXLEN_searchdomain];
FILE *fp;
int i;
sockaddr46_t sa;
if (!__res_sync) {
/* Reread /etc/resolv.conf if it was modified. */
struct stat sb;
if (stat(_PATH_RESCONF, &sb) != 0)
sb.st_mtime = 0;
if (resolv_conf_mtime != (uint32_t)sb.st_mtime) {
resolv_conf_mtime = sb.st_mtime;
__close_nameservers(); /* force config reread */
}
}
if (__nameservers)
goto sync;
__resolv_timeout = RES_TIMEOUT;
__resolv_attempts = RES_DFLRETRY;
fp = fopen(_PATH_RESCONF, "r");
#ifdef FALLBACK_TO_CONFIG_RESOLVCONF
if (!fp) {
/* If we do not have a pre-populated /etc/resolv.conf then
try to use the one from /etc/config which exists on numerous
systems ranging from some uClinux to IRIX installations and
may be the only /etc dir that was mounted rw. */
fp = fopen("/etc/config/resolv.conf", "r");
}
#endif
if (fp) {
while (fgets(szBuffer, sizeof(szBuffer), fp) != NULL) {
void *ptr;
char *keyword, *p;
keyword = p = skip_and_NUL_space(szBuffer);
/* skip keyword */
p = skip_nospace(p);
/* find next word */
p = skip_and_NUL_space(p);
if (strcmp(keyword, "nameserver") == 0) {
/* terminate IP addr */
*skip_nospace(p) = '\0';
memset(&sa, 0, sizeof(sa));
if (0) /* nothing */;
#ifdef __UCLIBC_HAS_IPV6__
else if (inet_pton(AF_INET6, p, &sa.sa6.sin6_addr) > 0) {
sa.sa6.sin6_family = AF_INET6;
sa.sa6.sin6_port = htons(NAMESERVER_PORT);
}
#endif
#ifdef __UCLIBC_HAS_IPV4__
else if (inet_pton(AF_INET, p, &sa.sa4.sin_addr) > 0) {
sa.sa4.sin_family = AF_INET;
sa.sa4.sin_port = htons(NAMESERVER_PORT);
}
#endif
else
continue; /* garbage on this line */
ptr = realloc(__nameserver, (__nameservers + 1) * sizeof(__nameserver[0]));
if (!ptr)
continue;
__nameserver = ptr;
__nameserver[__nameservers++] = sa; /* struct copy */
continue;
}
if (strcmp(keyword, "domain") == 0 || strcmp(keyword, "search") == 0) {
char *p1;
/* free old domains ("last 'domain' or 'search' wins" rule) */
while (__searchdomains)
free(__searchdomain[--__searchdomains]);
/*free(__searchdomain);*/
/*__searchdomain = NULL; - not necessary */
next_word:
/* terminate current word */
p1 = skip_nospace(p);
/* find next word (maybe) */
p1 = skip_and_NUL_space(p1);
/* add it */
ptr = realloc(__searchdomain, (__searchdomains + 1) * sizeof(__searchdomain[0]));
if (!ptr)
continue;
__searchdomain = ptr;
/* NB: strlen(p) <= MAXLEN_searchdomain) because szBuffer[] is smaller */
ptr = strdup(p);
if (!ptr)
continue;
DPRINTF("adding search %s\n", (char*)ptr);
__searchdomain[__searchdomains++] = (char*)ptr;
p = p1;
if (*p)
goto next_word;
continue;
}
/* if (strcmp(keyword, "sortlist") == 0)... */
if (strcmp(keyword, "options") == 0) {
char *p1;
uint8_t *what;
if (p == NULL || (p1 = strchr(p, ':')) == NULL)
continue;
*p1++ = '\0';
if (strcmp(p, "timeout") == 0)
what = &__resolv_timeout;
else if (strcmp(p, "attempts") == 0)
what = &__resolv_attempts;
else
continue;
*what = atoi(p1);
DPRINTF("option %s:%d\n", p, *what);
}
}
fclose(fp);
}
if (__nameservers == 0) {
/* Have to handle malloc failure! What a mess...
* And it's not only here, we need to be careful
* to never write into __nameserver[0] if it points
* to constant __local_nameserver, or free it. */
__nameserver = malloc(sizeof(__nameserver[0]));
if (__nameserver)
memcpy(__nameserver, &__local_nameserver, sizeof(__local_nameserver));
else
__nameserver = (void*) &__local_nameserver;
__nameservers++;
}
if (__searchdomains == 0) {
char buf[256];
char *p;
i = gethostname(buf, sizeof(buf) - 1);
buf[sizeof(buf) - 1] = '\0';
if (i == 0 && (p = strchr(buf, '.')) != NULL && p[1]) {
p = strdup(p + 1);
if (!p)
goto err;
__searchdomain = malloc(sizeof(__searchdomain[0]));
if (!__searchdomain) {
free(p);
goto err;
}
__searchdomain[0] = p;
__searchdomains++;
err: ;
}
}
DPRINTF("nameservers = %d\n", __nameservers);
sync:
if (__res_sync)
__res_sync();
}
#endif /* L_opennameservers */
#ifdef L_closenameservers
/* Must be called under __resolv_lock. */
void __close_nameservers(void)
{
if (__nameserver != (void*) &__local_nameserver)
free(__nameserver);
__nameserver = NULL;
__nameservers = 0;
while (__searchdomains)
free(__searchdomain[--__searchdomains]);
free(__searchdomain);
__searchdomain = NULL;
/*__searchdomains = 0; - already is */
}
#endif /* L_closenameservers */
#ifdef L_dnslookup
/* Helpers */
static int __length_question(const unsigned char *data, int maxlen)
{
const unsigned char *start;
unsigned b;
if (!data)
return -1;
start = data;
while (1) {
if (maxlen <= 0)
return -1;
b = *data++;
if (b == 0)
break;
if ((b & 0xc0) == 0xc0) {
/* It's a "compressed" name. */
data++; /* skip lsb of redirected offset */
maxlen -= 2;
break;
}
data += b;
maxlen -= (b + 1); /* account for data++ above */
}
/* Up to here we were skipping encoded name */
/* Account for QTYPE and QCLASS fields */
if (maxlen < 4)
return -1;
return data - start + 2 + 2;
}
static int __decode_answer(const unsigned char *message, /* packet */
int offset,
int len, /* total packet len */
struct resolv_answer *a)
{
char temp[256];
int i;
DPRINTF("decode_answer(start): off %d, len %d\n", offset, len);
i = __decode_dotted(message, offset, len, temp, sizeof(temp));
if (i < 0)
return i;
message += offset + i;
len -= i + RRFIXEDSZ + offset;
if (len < 0) {
DPRINTF("decode_answer: off %d, len %d, i %d\n", offset, len, i);
return len;
}
/* TODO: what if strdup fails? */
a->dotted = strdup(temp);
a->atype = (message[0] << 8) | message[1];
message += 2;
a->aclass = (message[0] << 8) | message[1];
message += 2;
a->ttl = (message[0] << 24) |
(message[1] << 16) | (message[2] << 8) | (message[3] << 0);
message += 4;
a->rdlength = (message[0] << 8) | message[1];
message += 2;
a->rdata = message;
a->rdoffset = offset + i + RRFIXEDSZ;
DPRINTF("i=%d,rdlength=%d\n", i, a->rdlength);
if (len < a->rdlength)
return -1;
return i + RRFIXEDSZ + a->rdlength;
}
/* On entry:
* a.buf(len) = auxiliary buffer for IP addresses after first one
* a.add_count = how many additional addresses are there already
* outpacket = where to save ptr to raw packet? can be NULL
* On exit:
* ret < 0: error, all other data is not valid
* ret >= 0: length of reply packet
* a.add_count & a.buf: updated
* a.rdlength: length of addresses (4 bytes for IPv4)
* *outpacket: updated (packet is malloced, you need to free it)
* a.rdata: points into *outpacket to 1st IP addr
* NB: don't pass outpacket == NULL if you need to use a.rdata!
* a.atype: type of query?
* a.dotted: which name we _actually_ used. May contain search domains
* appended. (why the filed is called "dotted" I have no idea)
* This is a malloced string. May be NULL because strdup failed.
*/
int __dns_lookup(const char *name,
int type,
unsigned char **outpacket,
struct resolv_answer *a)
{
/* Protected by __resolv_lock: */
static int last_ns_num = 0;
static uint16_t last_id = 1;
int i, j, fd, rc;
int packet_len;
int name_len;
#ifdef USE_SELECT
struct timeval tv;
fd_set fds;
#else
struct pollfd fds;
#endif
struct resolv_header h;
struct resolv_question q;
struct resolv_answer ma;
bool first_answer = 1;
int retries_left;
unsigned char *packet = malloc(PACKETSZ);
char *lookup;
int variant = -1; /* search domain to append, -1: none */
int local_ns_num = -1; /* Nth server to use */
int local_id = local_id; /* for compiler */
int sdomains = 0;
bool ends_with_dot;
bool contains_dot;
sockaddr46_t sa;
fd = -1;
lookup = NULL;
name_len = strlen(name);
if ((unsigned)name_len >= MAXDNAME - MAXLEN_searchdomain - 2)
goto fail; /* paranoia */
lookup = malloc(name_len + 1/*for '.'*/ + MAXLEN_searchdomain + 1);
if (!packet || !lookup || !name[0])
goto fail;
ends_with_dot = (name[name_len - 1] == '.');
contains_dot = strchr(name, '.') != NULL;
/* no strcpy! paranoia, user might change name[] under us */
memcpy(lookup, name, name_len);
DPRINTF("Looking up type %d answer for '%s'\n", type, name);
retries_left = 0; /* for compiler */
do {
unsigned act_variant;
int pos;
unsigned reply_timeout;
if (fd != -1) {
close(fd);
fd = -1;
}
/* Mess with globals while under lock */
/* NB: even data *pointed to* by globals may vanish
* outside the locks. We should assume any and all
* globals can completely change between locked
* code regions. OTOH, this is rare, so we don't need
* to handle it "nicely" (do not skip servers,
* search domains, etc), we only need to ensure
* we do not SEGV, use freed+overwritten data
* or do other Really Bad Things. */
__UCLIBC_MUTEX_LOCK(__resolv_lock);
__open_nameservers();
if (type != T_PTR) {
sdomains = __searchdomains;
}
lookup[name_len] = '\0';
/* For qualified names, act_variant = MAX_UINT, 0, .., sdomains-1
* => Try original name first, then append search domains
* For names without domain, act_variant = 0, 1, .., sdomains
* => Try search domains first, original name last */
act_variant = contains_dot ? variant : variant + 1;
if (act_variant < sdomains) {
/* lookup is name_len + 1 + MAXLEN_searchdomain + 1 long */
/* __searchdomain[] is not bigger than MAXLEN_searchdomain */
lookup[name_len] = '.';
strcpy(&lookup[name_len + 1], __searchdomain[act_variant]);
}
/* first time? pick starting server etc */
if (local_ns_num < 0) {
local_id = last_id;
/*TODO: implement /etc/resolv.conf's "options rotate"
(a.k.a. RES_ROTATE bit in _res.options)
local_ns_num = 0;
if (_res.options & RES_ROTATE) */
local_ns_num = last_ns_num;
retries_left = __nameservers * __resolv_attempts;
}
if (local_ns_num >= __nameservers)
local_ns_num = 0;
local_id++;
local_id &= 0xffff;
/* write new values back while still under lock */
last_id = local_id;
last_ns_num = local_ns_num;
/* struct copy */
/* can't just take a pointer, __nameserver[x]
* is not safe to use outside of locks */
sa = __nameserver[local_ns_num];
__UCLIBC_MUTEX_UNLOCK(__resolv_lock);
memset(packet, 0, PACKETSZ);
memset(&h, 0, sizeof(h));
/* encode header */
h.id = local_id;
h.qdcount = 1;
h.rd = 1;
DPRINTF("encoding header\n", h.rd);
i = __encode_header(&h, packet, PACKETSZ);
if (i < 0)
goto fail;
/* encode question */
DPRINTF("lookup name: %s\n", lookup);
q.dotted = lookup;
q.qtype = type;
q.qclass = C_IN; /* CLASS_IN */
j = __encode_question(&q, packet+i, PACKETSZ-i);
if (j < 0)
goto fail;
packet_len = i + j;
/* send packet */
#ifdef DEBUG
{
const socklen_t plen = sa.sa.sa_family == AF_INET ? INET_ADDRSTRLEN : INET6_ADDRSTRLEN;
char *pbuf = malloc(plen);
if (pbuf == NULL) ;/* nothing */
#ifdef __UCLIBC_HAS_IPV6__
else if (sa.sa.sa_family == AF_INET6)
pbuf = (char*)inet_ntop(AF_INET6, &sa.sa6.sin6_addr, pbuf, plen);
#endif
#ifdef __UCLIBC_HAS_IPV4__
else if (sa.sa.sa_family == AF_INET)
pbuf = (char*)inet_ntop(AF_INET, &sa.sa4.sin_addr, pbuf, plen);
#endif
DPRINTF("On try %d, sending query to %s, port %d\n",
retries_left, pbuf, NAMESERVER_PORT);
free(pbuf);
}
#endif
fd = socket(sa.sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0) /* paranoia */
goto try_next_server;
rc = connect(fd, &sa.sa, sizeof(sa));
if (rc < 0) {
/*if (errno == ENETUNREACH) { */
/* routing error, presume not transient */
goto try_next_server;
/*} */
/*For example, what transient error this can be? Can't think of any */
/* retry */
/*continue; */
}
DPRINTF("Xmit packet len:%d id:%d qr:%d\n", packet_len, h.id, h.qr);
/* no error check - if it fails, we time out on recv */
send(fd, packet, packet_len, 0);
#ifdef USE_SELECT
reply_timeout = __resolv_timeout;
wait_again:
FD_ZERO(&fds);
FD_SET(fd, &fds);
tv.tv_sec = reply_timeout;
tv.tv_usec = 0;
if (select(fd + 1, &fds, NULL, NULL, &tv) <= 0) {
DPRINTF("Timeout\n");
/* timed out, so retry send and receive
* to next nameserver */
goto try_next_server;
}
reply_timeout--;
#else /* !USE_SELECT */
reply_timeout = __resolv_timeout * 1000;
wait_again:
fds.fd = fd;
fds.events = POLLIN;
if (poll(&fds, 1, reply_timeout) <= 0) {
DPRINTF("Timeout\n");
/* timed out, so retry send and receive
* to next nameserver */
goto try_next_server;
}
if (fds.revents & (POLLERR | POLLHUP | POLLNVAL)) {
DPRINTF("Bad event\n");
goto try_next_server;
}
/*TODO: better timeout accounting?*/
reply_timeout -= 1000;
#endif /* USE_SELECT */
/* vda: a bogus response seen in real world (caused SEGV in uclibc):
* "ping www.google.com" sending AAAA query and getting
* response with one answer... with answer part missing!
* Fixed by thorough checks for not going past the packet's end.
*/
#ifdef DEBUG
{
static const char test_query[32] = "\0\2\1\0\0\1\0\0\0\0\0\0\3www\6google\3com\0\0\34\0\1";
static const char test_respn[32] = "\0\2\201\200\0\1\0\1\0\0\0\0\3www\6google\3com\0\0\34\0\1";
pos = memcmp(packet + 2, test_query + 2, 30);
packet_len = recv(fd, packet, PACKETSZ, MSG_DONTWAIT);
if (pos == 0) {
packet_len = 32;
memcpy(packet + 2, test_respn + 2, 30);
}
}
#else
packet_len = recv(fd, packet, PACKETSZ, MSG_DONTWAIT);
#endif
if (packet_len < HFIXEDSZ) {
/* too short!
* If the peer did shutdown then retry later,
* try next peer on error.
* it's just a bogus packet from somewhere */
bogus_packet:
if (packet_len >= 0 && reply_timeout)
goto wait_again;
goto try_next_server;
}
__decode_header(packet, &h);
DPRINTF("len:%d id:%d qr:%d\n", packet_len, h.id, h.qr);
if (h.id != local_id || !h.qr) {
/* unsolicited */
goto bogus_packet;
}
DPRINTF("Got response (i think)!\n");
DPRINTF("qrcount=%d,ancount=%d,nscount=%d,arcount=%d\n",
h.qdcount, h.ancount, h.nscount, h.arcount);
DPRINTF("opcode=%d,aa=%d,tc=%d,rd=%d,ra=%d,rcode=%d\n",
h.opcode, h.aa, h.tc, h.rd, h.ra, h.rcode);
/* bug 660 says we treat negative response as an error
* and retry, which is, eh, an error. :)
* We were incurring long delays because of this. */
if (h.rcode == NXDOMAIN || h.rcode == SERVFAIL) {
/* if possible, try next search domain */
if (!ends_with_dot) {
DPRINTF("variant:%d sdomains:%d\n", variant, sdomains);
if (variant < sdomains - 1) {
/* next search domain */
variant++;
continue;
}
/* no more search domains to try */
}
if (h.rcode != SERVFAIL) {
/* dont loop, this is "no such host" situation */
h_errno = HOST_NOT_FOUND;
goto fail1;
}
}
/* Insert other non-fatal errors here, which do not warrant
* switching to next nameserver */
/* Strange error, assuming this nameserver is feeling bad */
if (h.rcode != 0)
goto try_next_server;
/* Code below won't work correctly with h.ancount == 0, so... */
if (h.ancount <= 0) {
h_errno = NO_DATA; /* [is this correct code to check for?] */
goto fail1;
}
pos = HFIXEDSZ;
for (j = 0; j < h.qdcount; j++) {
DPRINTF("Skipping question %d at %d\n", j, pos);
i = __length_question(packet + pos, packet_len - pos);
if (i < 0) {
DPRINTF("Packet'question section "
"is truncated, trying next server\n");
goto try_next_server;
}
pos += i;
DPRINTF("Length of question %d is %d\n", j, i);
}
DPRINTF("Decoding answer at pos %d\n", pos);
first_answer = 1;
a->dotted = NULL;
for (j = 0; j < h.ancount; j++) {
i = __decode_answer(packet, pos, packet_len, &ma);
if (i < 0) {
DPRINTF("failed decode %d\n", i);
/* If the message was truncated but we have
* decoded some answers, pretend it's OK */
if (j && h.tc)
break;
goto try_next_server;
}
pos += i;
if (first_answer) {
ma.buf = a->buf;
ma.buflen = a->buflen;
ma.add_count = a->add_count;
free(a->dotted);
memcpy(a, &ma, sizeof(ma));
if (a->atype != T_SIG && (NULL == a->buf || (type != T_A && type != T_AAAA)))
break;
if (a->atype != type)
continue;
a->add_count = h.ancount - j - 1;
if ((a->rdlength + sizeof(struct in_addr*)) * a->add_count > a->buflen)
break;
a->add_count = 0;
first_answer = 0;
} else {
free(ma.dotted);
if (ma.atype != type)
continue;
if (a->rdlength != ma.rdlength) {
free(a->dotted);
DPRINTF("Answer address len(%u) differs from original(%u)\n",
ma.rdlength, a->rdlength);
goto try_next_server;
}
memcpy(a->buf + (a->add_count * ma.rdlength), ma.rdata, ma.rdlength);
++a->add_count;
}
}
/* Success! */
DPRINTF("Answer name = |%s|\n", a->dotted);
DPRINTF("Answer type = |%d|\n", a->atype);
if (fd != -1)
close(fd);
if (outpacket)
*outpacket = packet;
else
free(packet);
free(lookup);
return packet_len;
try_next_server:
/* Try next nameserver */
retries_left--;
local_ns_num++;
variant = -1;
} while (retries_left > 0);
fail:
h_errno = NETDB_INTERNAL;
fail1:
if (fd != -1)
close(fd);
free(lookup);
free(packet);
return -1;
}
#endif /* L_dnslookup */
#ifdef L_read_etc_hosts_r
parser_t * __open_etc_hosts(void)
{
parser_t *parser;
parser = config_open("/etc/hosts");
#ifdef FALLBACK_TO_CONFIG_RESOLVCONF
if (parser == NULL)
parser = config_open("/etc/config/hosts");
#endif
return parser;
}
#define MINTOKENS 2 /* ip address + canonical name */
#define MAXTOKENS (MINTOKENS + MAXALIASES)
#define HALISTOFF (sizeof(char*) * (MAXTOKENS + 1)) /* reserve space for list terminator */
#define INADDROFF (HALISTOFF + 2 * sizeof(char*))
int __read_etc_hosts_r(
parser_t * parser,
const char *name,
int type,
enum etc_hosts_action action,
struct hostent *result_buf,
char *buf, size_t buflen,
struct hostent **result,
int *h_errnop)
{
char **tok = NULL;
struct in_addr *h_addr0 = NULL;
const size_t aliaslen = INADDROFF +
#ifdef __UCLIBC_HAS_IPV6__
sizeof(struct in6_addr)
#else
sizeof(struct in_addr)
#endif
;
int ret = HOST_NOT_FOUND;
/* make sure pointer is aligned */
int i = ALIGN_BUFFER_OFFSET(buf);
buf += i;
buflen -= i;
*h_errnop = NETDB_INTERNAL;
if (/* (ssize_t)buflen < 0 || */ buflen < aliaslen
|| (buflen - aliaslen) < BUFSZ + 1)
return ERANGE;
if (parser == NULL)
parser = __open_etc_hosts();
if (parser == NULL) {
*result = NULL;
return errno;
}
/* Layout in buf:
* char *alias[MAXTOKENS] = {address, name, aliases...}
* char **h_addr_list[1] = {*in[6]_addr, NULL}
* struct in[6]_addr
* char line_buffer[BUFSZ+];
*/
parser->data = buf;
parser->data_len = aliaslen;
parser->line_len = buflen - aliaslen;
*h_errnop = HOST_NOT_FOUND;
/* <ip>[[:space:]][<aliases>] */
while (config_read(parser, &tok, MAXTOKENS, MINTOKENS, "# \t", PARSE_NORMAL)) {
result_buf->h_aliases = tok+1;
if (action == GETHOSTENT) {
/* Return whatever the next entry happens to be. */
;
} else if (action == GET_HOSTS_BYADDR) {
if (strcmp(name, *tok) != 0)
continue;
} else { /* GET_HOSTS_BYNAME */
int aliases = 0;
char **alias = tok + 1;
while (aliases < MAXALIASES) {
char *tmp = *(alias+aliases++);
if (tmp && strcasecmp(name, tmp) == 0)
goto found;
}
continue;
}
found:
result_buf->h_name = *(result_buf->h_aliases++);
result_buf->h_addr_list = (char**)(buf + HALISTOFF);
*(result_buf->h_addr_list + 1) = '\0';
h_addr0 = (struct in_addr*)(buf + INADDROFF);
result_buf->h_addr = (char*)h_addr0;
if (0) /* nothing */;
#ifdef __UCLIBC_HAS_IPV4__
else if (type == AF_INET
&& inet_pton(AF_INET, *tok, h_addr0) > 0) {
DPRINTF("Found INET\n");
result_buf->h_addrtype = AF_INET;
result_buf->h_length = sizeof(struct in_addr);
*result = result_buf;
ret = NETDB_SUCCESS;
}
#endif
#ifdef __UCLIBC_HAS_IPV6__
#define in6 ((struct in6_addr *)buf)
else if (type == AF_INET6
&& inet_pton(AF_INET6, *tok, h_addr0) > 0) {
DPRINTF("Found INET6\n");
result_buf->h_addrtype = AF_INET6;
result_buf->h_length = sizeof(struct in6_addr);
*result = result_buf;
ret = NETDB_SUCCESS;
}
#endif
else {
/* continue parsing in the hope the user has multiple
* host types listed in the database like so:
* <ipv4 addr> host
* <ipv6 addr> host
* If looking for an IPv6 addr, don't bail when we got the IPv4
*/
DPRINTF("Error: Found host but different address family\n");
/* NB: gethostbyname2_r depends on this feature
* to avoid looking for IPv6 addr of "localhost" etc */
ret = TRY_AGAIN;
continue;
}
break;
}
if (action != GETHOSTENT)
config_close(parser);
return ret;
#undef in6
}
#endif /* L_read_etc_hosts_r */
#ifdef L_get_hosts_byname_r
int __get_hosts_byname_r(const char *name,
int type,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop)
{
return __read_etc_hosts_r(NULL, name, type, GET_HOSTS_BYNAME,
result_buf, buf, buflen, result, h_errnop);
}
#endif /* L_get_hosts_byname_r */
#ifdef L_get_hosts_byaddr_r
int __get_hosts_byaddr_r(const char *addr,
int len,
int type,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop)
{
#ifndef __UCLIBC_HAS_IPV6__
char ipaddr[INET_ADDRSTRLEN];
#else
char ipaddr[INET6_ADDRSTRLEN];
#endif
switch (type) {
#ifdef __UCLIBC_HAS_IPV4__
case AF_INET:
if (len != sizeof(struct in_addr))
return 0;
break;
#endif
#ifdef __UCLIBC_HAS_IPV6__
case AF_INET6:
if (len != sizeof(struct in6_addr))
return 0;
break;
#endif
default:
return 0;
}
inet_ntop(type, addr, ipaddr, sizeof(ipaddr));
return __read_etc_hosts_r(NULL, ipaddr, type, GET_HOSTS_BYADDR,
result_buf, buf, buflen, result, h_errnop);
}
#endif /* L_get_hosts_byaddr_r */
#ifdef L_getnameinfo
int getnameinfo(const struct sockaddr *sa,
socklen_t addrlen,
char *host,
socklen_t hostlen,
char *serv,
socklen_t servlen,
unsigned flags)
{
int serrno = errno;
bool ok = 0;
struct hostent *hoste = NULL;
char domain[256];
if (flags & ~(NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|NI_DGRAM))
return EAI_BADFLAGS;
if (sa == NULL || addrlen < sizeof(sa_family_t))
return EAI_FAMILY;
if ((flags & NI_NAMEREQD) && host == NULL && serv == NULL)
return EAI_NONAME;
if (sa->sa_family == AF_LOCAL) /* valid */;
#ifdef __UCLIBC_HAS_IPV4__
else if (sa->sa_family == AF_INET) {
if (addrlen < sizeof(struct sockaddr_in))
return EAI_FAMILY;
}
#endif
#ifdef __UCLIBC_HAS_IPV6__
else if (sa->sa_family == AF_INET6) {
if (addrlen < sizeof(struct sockaddr_in6))
return EAI_FAMILY;
}
#endif
else
return EAI_FAMILY;
if (host != NULL && hostlen > 0)
switch (sa->sa_family) {
case AF_INET:
#ifdef __UCLIBC_HAS_IPV6__
case AF_INET6:
#endif
if (!(flags & NI_NUMERICHOST)) {
if (0) /* nothing */;
#ifdef __UCLIBC_HAS_IPV6__
else if (sa->sa_family == AF_INET6)
hoste = gethostbyaddr((const void *)
&(((const struct sockaddr_in6 *) sa)->sin6_addr),
sizeof(struct in6_addr), AF_INET6);
#endif
#ifdef __UCLIBC_HAS_IPV4__
else
hoste = gethostbyaddr((const void *)
&(((const struct sockaddr_in *)sa)->sin_addr),
sizeof(struct in_addr), AF_INET);
#endif
if (hoste) {
char *c;
if ((flags & NI_NOFQDN)
&& (getdomainname(domain, sizeof(domain)) == 0)
&& (c = strstr(hoste->h_name, domain)) != NULL
&& (c != hoste->h_name) && (*(--c) == '.')
) {
strncpy(host, hoste->h_name,
MIN(hostlen, (size_t) (c - hoste->h_name)));
host[MIN(hostlen - 1, (size_t) (c - hoste->h_name))] = '\0';
} else {
strncpy(host, hoste->h_name, hostlen);
}
ok = 1;
}
}
if (!ok) {
const char *c = NULL;
if (flags & NI_NAMEREQD) {
errno = serrno;
return EAI_NONAME;
}
if (0) /* nothing */;
#ifdef __UCLIBC_HAS_IPV6__
else if (sa->sa_family == AF_INET6) {
const struct sockaddr_in6 *sin6p;
sin6p = (const struct sockaddr_in6 *) sa;
c = inet_ntop(AF_INET6,
(const void *) &sin6p->sin6_addr,
host, hostlen);
#if 0
/* Does scope id need to be supported? */
uint32_t scopeid;
scopeid = sin6p->sin6_scope_id;
if (scopeid != 0) {
/* Buffer is >= IFNAMSIZ+1. */
char scopebuf[IFNAMSIZ + 1];
char *scopeptr;
int ni_numericscope = 0;
size_t real_hostlen = strnlen(host, hostlen);
size_t scopelen = 0;
scopebuf[0] = SCOPE_DELIMITER;
scopebuf[1] = '\0';
scopeptr = &scopebuf[1];
if (IN6_IS_ADDR_LINKLOCAL(&sin6p->sin6_addr)
|| IN6_IS_ADDR_MC_LINKLOCAL(&sin6p->sin6_addr)) {
if (if_indextoname(scopeid, scopeptr) == NULL)
++ni_numericscope;
else
scopelen = strlen(scopebuf);
} else {
++ni_numericscope;
}
if (ni_numericscope)
scopelen = 1 + snprintf(scopeptr,
(scopebuf
+ sizeof scopebuf
- scopeptr),
"%u", scopeid);
if (real_hostlen + scopelen + 1 > hostlen)
return EAI_SYSTEM;
memcpy(host + real_hostlen, scopebuf, scopelen + 1);
}
#endif
}
#endif /* __UCLIBC_HAS_IPV6__ */
#if defined __UCLIBC_HAS_IPV4__
else {
c = inet_ntop(AF_INET, (const void *)
&(((const struct sockaddr_in *) sa)->sin_addr),
host, hostlen);
}
#endif
if (c == NULL) {
errno = serrno;
return EAI_SYSTEM;
}
ok = 1;
}
break;
case AF_LOCAL:
if (!(flags & NI_NUMERICHOST)) {
struct utsname utsname;
if (!uname(&utsname)) {
strncpy(host, utsname.nodename, hostlen);
break;
};
};
if (flags & NI_NAMEREQD) {
errno = serrno;
return EAI_NONAME;
}
strncpy(host, "localhost", hostlen);
break;
/* Already checked above
default:
return EAI_FAMILY;
*/
}
if (serv && (servlen > 0)) {
if (sa->sa_family == AF_LOCAL) {
strncpy(serv, ((const struct sockaddr_un *) sa)->sun_path, servlen);
} else { /* AF_INET || AF_INET6 */
if (!(flags & NI_NUMERICSERV)) {
struct servent *s;
s = getservbyport(((const struct sockaddr_in *) sa)->sin_port,
((flags & NI_DGRAM) ? "udp" : "tcp"));
if (s) {
strncpy(serv, s->s_name, servlen);
goto DONE;
}
}
snprintf(serv, servlen, "%d",
ntohs(((const struct sockaddr_in *) sa)->sin_port));
}
}
DONE:
if (host && (hostlen > 0))
host[hostlen-1] = 0;
if (serv && (servlen > 0))
serv[servlen-1] = 0;
errno = serrno;
return 0;
}
libc_hidden_def(getnameinfo)
#endif /* L_getnameinfo */
#ifdef L_gethostbyname_r
/* Bug 671 says:
* "uClibc resolver's gethostbyname does not return the requested name
* as an alias, but instead returns the canonical name. glibc's
* gethostbyname has a similar bug where it returns the requested name
* with the search domain name appended (to make a FQDN) as an alias,
* but not the original name itself. Both contradict POSIX, which says
* that the name argument passed to gethostbyname must be in the alias list"
* This is fixed now, and we differ from glibc:
*
* $ ./gethostbyname_uclibc wer.google.com
* h_name:'c13-ss-2-lb.cnet.com'
* h_length:4
* h_addrtype:2 AF_INET
* alias:'wer.google.com' <===
* addr: 0x4174efd8 '216.239.116.65'
*
* $ ./gethostbyname_glibc wer.google.com
* h_name:'c13-ss-2-lb.cnet.com'
* h_length:4
* h_addrtype:2 AF_INET
* alias:'wer.google.com.com' <===
* addr:'216.239.116.65'
*
* When examples were run, /etc/resolv.conf contained "search com" line.
*/
int gethostbyname_r(const char *name,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop)
{
struct in_addr **addr_list;
char **alias;
char *alias0;
unsigned char *packet;
struct resolv_answer a;
int i;
int packet_len;
int wrong_af = 0;
*result = NULL;
if (!name)
return EINVAL;
/* do /etc/hosts first */
{
int old_errno = errno; /* save the old errno and reset errno */
__set_errno(0); /* to check for missing /etc/hosts. */
i = __get_hosts_byname_r(name, AF_INET, result_buf,
buf, buflen, result, h_errnop);
if (i == NETDB_SUCCESS) {
__set_errno(old_errno);
return i;
}
switch (*h_errnop) {
case HOST_NOT_FOUND:
wrong_af = (i == TRY_AGAIN);
case NO_ADDRESS:
break;
case NETDB_INTERNAL:
if (errno == ENOENT) {
break;
}
/* else fall through */
default:
return i;
}
__set_errno(old_errno);
}
DPRINTF("Nothing found in /etc/hosts\n");
*h_errnop = NETDB_INTERNAL;
/* prepare future h_aliases[0] */
i = strlen(name) + 1;
if ((ssize_t)buflen <= i)
return ERANGE;
memcpy(buf, name, i); /* paranoia: name might change */
alias0 = buf;
buf += i;
buflen -= i;
/* make sure pointer is aligned */
i = ALIGN_BUFFER_OFFSET(buf);
buf += i;
buflen -= i;
/* Layout in buf:
* char *alias[2];
* struct in_addr* addr_list[NN+1];
* struct in_addr* in[NN];
*/
alias = (char **)buf;
buf += sizeof(alias[0]) * 2;
buflen -= sizeof(alias[0]) * 2;
addr_list = (struct in_addr **)buf;
/* buflen may be < 0, must do signed compare */
if ((ssize_t)buflen < 256)
return ERANGE;
/* we store only one "alias" - the name itself */
alias[0] = alias0;
alias[1] = NULL;
/* maybe it is already an address? */
{
struct in_addr *in = (struct in_addr *)(buf + sizeof(addr_list[0]) * 2);
if (inet_aton(name, in)) {
addr_list[0] = in;
addr_list[1] = NULL;
result_buf->h_name = alias0;
result_buf->h_aliases = alias;
result_buf->h_addrtype = AF_INET;
result_buf->h_length = sizeof(struct in_addr);
result_buf->h_addr_list = (char **) addr_list;
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
return NETDB_SUCCESS;
}
}
/* what if /etc/hosts has it but it's not IPv4?
* F.e. "::1 localhost6". We don't do DNS query for such hosts -
* "ping localhost6" should be fast even if DNS server is down! */
if (wrong_af) {
*h_errnop = HOST_NOT_FOUND;
return TRY_AGAIN;
}
/* talk to DNS servers */
a.buf = buf;
/* take into account that at least one address will be there,
* we'll need space for one in_addr + two addr_list[] elems */
a.buflen = buflen - ((sizeof(addr_list[0]) * 2 + sizeof(struct in_addr)));
a.add_count = 0;
packet_len = __dns_lookup(name, T_A, &packet, &a);
if (packet_len < 0) {
*h_errnop = HOST_NOT_FOUND;
DPRINTF("__dns_lookup returned < 0\n");
return TRY_AGAIN;
}
if (a.atype == T_A) { /* ADDRESS */
/* we need space for addr_list[] and one IPv4 address */
/* + 1 accounting for 1st addr (it's in a.rdata),
* another + 1 for NULL in last addr_list[]: */
int need_bytes = sizeof(addr_list[0]) * (a.add_count + 1 + 1)
/* for 1st addr (it's in a.rdata): */
+ sizeof(struct in_addr);
/* how many bytes will 2nd and following addresses take? */
int ips_len = a.add_count * a.rdlength;
buflen -= (need_bytes + ips_len);
if ((ssize_t)buflen < 0) {
DPRINTF("buffer too small for all addresses\n");
/* *h_errnop = NETDB_INTERNAL; - already is */
i = ERANGE;
goto free_and_ret;
}
/* if there are additional addresses in buf,
* move them forward so that they are not destroyed */
DPRINTF("a.add_count:%d a.rdlength:%d a.rdata:%p\n", a.add_count, a.rdlength, a.rdata);
memmove(buf + need_bytes, buf, ips_len);
/* 1st address is in a.rdata, insert it */
buf += need_bytes - sizeof(struct in_addr);
memcpy(buf, a.rdata, sizeof(struct in_addr));
/* fill addr_list[] */
for (i = 0; i <= a.add_count; i++) {
addr_list[i] = (struct in_addr*)buf;
buf += sizeof(struct in_addr);
}
addr_list[i] = NULL;
/* if we have enough space, we can report "better" name
* (it may contain search domains attached by __dns_lookup,
* or CNAME of the host if it is different from the name
* we used to find it) */
if (a.dotted && buflen > strlen(a.dotted)) {
strcpy(buf, a.dotted);
alias0 = buf;
}
result_buf->h_name = alias0;
result_buf->h_aliases = alias;
result_buf->h_addrtype = AF_INET;
result_buf->h_length = sizeof(struct in_addr);
result_buf->h_addr_list = (char **) addr_list;
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
i = NETDB_SUCCESS;
goto free_and_ret;
}
*h_errnop = HOST_NOT_FOUND;
__set_h_errno(HOST_NOT_FOUND);
i = TRY_AGAIN;
free_and_ret:
free(a.dotted);
free(packet);
return i;
}
libc_hidden_def(gethostbyname_r)
#endif /* L_gethostbyname_r */
#ifdef L_gethostbyname2_r
int gethostbyname2_r(const char *name,
int family,
struct hostent *result_buf,
char *buf,
size_t buflen,
struct hostent **result,
int *h_errnop)
{
#ifndef __UCLIBC_HAS_IPV6__
return family == (AF_INET)
? gethostbyname_r(name, result_buf, buf, buflen, result, h_errnop)
: HOST_NOT_FOUND;
#else
struct in6_addr **addr_list;
char **alias;
char *alias0;
unsigned char *packet;
struct resolv_answer a;
int i;
int packet_len;
int wrong_af = 0;
if (family == AF_INET)
return gethostbyname_r(name, result_buf, buf, buflen, result, h_errnop);
*result = NULL;
if (family != AF_INET6)
return EINVAL;
if (!name)
return EINVAL;
/* do /etc/hosts first */
{
int old_errno = errno; /* save the old errno and reset errno */
__set_errno(0); /* to check for missing /etc/hosts. */
i = __get_hosts_byname_r(name, AF_INET6 /*family*/, result_buf,
buf, buflen, result, h_errnop);
if (i == NETDB_SUCCESS) {
__set_errno(old_errno);
return i;
}
switch (*h_errnop) {
case HOST_NOT_FOUND:
wrong_af = (i == TRY_AGAIN);
case NO_ADDRESS:
break;
case NETDB_INTERNAL:
if (errno == ENOENT) {
break;
}
/* else fall through */
default:
return i;
}
__set_errno(old_errno);
}
DPRINTF("Nothing found in /etc/hosts\n");
*h_errnop = NETDB_INTERNAL;
/* prepare future h_aliases[0] */
i = strlen(name) + 1;
if ((ssize_t)buflen <= i)
return ERANGE;
memcpy(buf, name, i); /* paranoia: name might change */
alias0 = buf;
buf += i;
buflen -= i;
/* make sure pointer is aligned */
i = ALIGN_BUFFER_OFFSET(buf);
buf += i;
buflen -= i;
/* Layout in buf:
* char *alias[2];
* struct in6_addr* addr_list[NN+1];
* struct in6_addr* in[NN];
*/
alias = (char **)buf;
buf += sizeof(alias[0]) * 2;
buflen -= sizeof(alias[0]) * 2;
addr_list = (struct in6_addr **)buf;
/* buflen may be < 0, must do signed compare */
if ((ssize_t)buflen < 256)
return ERANGE;
/* we store only one "alias" - the name itself */
alias[0] = alias0;
alias[1] = NULL;
/* maybe it is already an address? */
{
struct in6_addr *in = (struct in6_addr *)(buf + sizeof(addr_list[0]) * 2);
if (inet_pton(AF_INET6, name, in)) {
addr_list[0] = in;
addr_list[1] = NULL;
result_buf->h_name = alias0;
result_buf->h_aliases = alias;
result_buf->h_addrtype = AF_INET6;
result_buf->h_length = sizeof(struct in6_addr);
result_buf->h_addr_list = (char **) addr_list;
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
return NETDB_SUCCESS;
}
}
/* what if /etc/hosts has it but it's not IPv6?
* F.e. "127.0.0.1 localhost". We don't do DNS query for such hosts -
* "ping localhost" should be fast even if DNS server is down! */
if (wrong_af) {
*h_errnop = HOST_NOT_FOUND;
return TRY_AGAIN;
}
/* talk to DNS servers */
a.buf = buf;
/* take into account that at least one address will be there,
* we'll need space of one in6_addr + two addr_list[] elems */
a.buflen = buflen - ((sizeof(addr_list[0]) * 2 + sizeof(struct in6_addr)));
a.add_count = 0;
packet_len = __dns_lookup(name, T_AAAA, &packet, &a);
if (packet_len < 0) {
*h_errnop = HOST_NOT_FOUND;
DPRINTF("__dns_lookup returned < 0\n");
return TRY_AGAIN;
}
if (a.atype == T_AAAA) { /* ADDRESS */
/* we need space for addr_list[] and one IPv6 address */
/* + 1 accounting for 1st addr (it's in a.rdata),
* another + 1 for NULL in last addr_list[]: */
int need_bytes = sizeof(addr_list[0]) * (a.add_count + 1 + 1)
/* for 1st addr (it's in a.rdata): */
+ sizeof(struct in6_addr);
/* how many bytes will 2nd and following addresses take? */
int ips_len = a.add_count * a.rdlength;
buflen -= (need_bytes + ips_len);
if ((ssize_t)buflen < 0) {
DPRINTF("buffer too small for all addresses\n");
/* *h_errnop = NETDB_INTERNAL; - already is */
i = ERANGE;
goto free_and_ret;
}
/* if there are additional addresses in buf,
* move them forward so that they are not destroyed */
DPRINTF("a.add_count:%d a.rdlength:%d a.rdata:%p\n", a.add_count, a.rdlength, a.rdata);
memmove(buf + need_bytes, buf, ips_len);
/* 1st address is in a.rdata, insert it */
buf += need_bytes - sizeof(struct in6_addr);
memcpy(buf, a.rdata, sizeof(struct in6_addr));
/* fill addr_list[] */
for (i = 0; i <= a.add_count; i++) {
addr_list[i] = (struct in6_addr*)buf;
buf += sizeof(struct in6_addr);
}
addr_list[i] = NULL;
/* if we have enough space, we can report "better" name
* (it may contain search domains attached by __dns_lookup,
* or CNAME of the host if it is different from the name
* we used to find it) */
if (a.dotted && buflen > strlen(a.dotted)) {
strcpy(buf, a.dotted);
alias0 = buf;
}
result_buf->h_name = alias0;
result_buf->h_aliases = alias;
result_buf->h_addrtype = AF_INET6;
result_buf->h_length = sizeof(struct in6_addr);
result_buf->h_addr_list = (char **) addr_list;
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
i = NETDB_SUCCESS;
goto free_and_ret;
}
*h_errnop = HOST_NOT_FOUND;
__set_h_errno(HOST_NOT_FOUND);
i = TRY_AGAIN;
free_and_ret:
free(a.dotted);
free(packet);
return i;
#endif /* __UCLIBC_HAS_IPV6__ */
}
libc_hidden_def(gethostbyname2_r)
#endif /* L_gethostbyname2_r */
#ifdef L_gethostbyaddr_r
int gethostbyaddr_r(const void *addr, socklen_t addrlen,
int type,
struct hostent *result_buf,
char *buf, size_t buflen,
struct hostent **result,
int *h_errnop)
{
struct in_addr *in;
struct in_addr **addr_list;
char **alias;
unsigned char *packet;
struct resolv_answer a;
int i;
int packet_len;
int nest = 0;
*result = NULL;
if (!addr)
return EINVAL;
switch (type) {
#ifdef __UCLIBC_HAS_IPV4__
case AF_INET:
if (addrlen != sizeof(struct in_addr))
return EINVAL;
break;
#endif
#ifdef __UCLIBC_HAS_IPV6__
case AF_INET6:
if (addrlen != sizeof(struct in6_addr))
return EINVAL;
break;
#endif
default:
return EINVAL;
}
/* do /etc/hosts first */
i = __get_hosts_byaddr_r(addr, addrlen, type, result_buf,
buf, buflen, result, h_errnop);
if (i == 0)
return i;
switch (*h_errnop) {
case HOST_NOT_FOUND:
case NO_ADDRESS:
break;
default:
return i;
}
*h_errnop = NETDB_INTERNAL;
/* make sure pointer is aligned */
i = ALIGN_BUFFER_OFFSET(buf);
buf += i;
buflen -= i;
/* Layout in buf:
* char *alias[ALIAS_DIM];
* struct in[6]_addr* addr_list[2];
* struct in[6]_addr in;
* char scratch_buffer[256+];
*/
#define in6 ((struct in6_addr *)in)
alias = (char **)buf;
addr_list = (struct in_addr**)buf;
buf += sizeof(*addr_list) * 2;
buflen -= sizeof(*addr_list) * 2;
in = (struct in_addr*)buf;
#ifndef __UCLIBC_HAS_IPV6__
buf += sizeof(*in);
buflen -= sizeof(*in);
if (addrlen > sizeof(*in))
return ERANGE;
#else
buf += sizeof(*in6);
buflen -= sizeof(*in6);
if (addrlen > sizeof(*in6))
return ERANGE;
#endif
if ((ssize_t)buflen < 256)
return ERANGE;
alias[0] = buf;
alias[1] = NULL;
addr_list[0] = in;
addr_list[1] = NULL;
memcpy(in, addr, addrlen);
if (0) /* nothing */;
#ifdef __UCLIBC_HAS_IPV4__
else IF_HAS_BOTH(if (type == AF_INET)) {
unsigned char *tp = (unsigned char *)addr;
sprintf(buf, "%u.%u.%u.%u.in-addr.arpa",
tp[3], tp[2], tp[1], tp[0]);
}
#endif
#ifdef __UCLIBC_HAS_IPV6__
else {
char *dst = buf;
unsigned char *tp = (unsigned char *)addr + addrlen - 1;
do {
dst += sprintf(dst, "%x.%x.", tp[0] & 0xf, tp[0] >> 4);
tp--;
} while (tp >= (unsigned char *)addr);
strcpy(dst, "ip6.arpa");
}
#endif
memset(&a, '\0', sizeof(a));
for (;;) {
/* Hmm why we memset(a) to zeros only once? */
packet_len = __dns_lookup(buf, T_PTR, &packet, &a);
if (packet_len < 0) {
*h_errnop = HOST_NOT_FOUND;
return TRY_AGAIN;
}
strncpy(buf, a.dotted, buflen);
free(a.dotted);
if (a.atype != T_CNAME)
break;
DPRINTF("Got a CNAME in gethostbyaddr()\n");
if (++nest > MAX_RECURSE) {
*h_errnop = NO_RECOVERY;
return -1;
}
/* Decode CNAME into buf, feed it to __dns_lookup() again */
i = __decode_dotted(packet, a.rdoffset, packet_len, buf, buflen);
free(packet);
if (i < 0) {
*h_errnop = NO_RECOVERY;
return -1;
}
}
if (a.atype == T_PTR) { /* ADDRESS */
i = __decode_dotted(packet, a.rdoffset, packet_len, buf, buflen);
free(packet);
result_buf->h_name = buf;
result_buf->h_addrtype = type;
result_buf->h_length = addrlen;
result_buf->h_addr_list = (char **) addr_list;
result_buf->h_aliases = alias;
*result = result_buf;
*h_errnop = NETDB_SUCCESS;
return NETDB_SUCCESS;
}
free(packet);
*h_errnop = NO_ADDRESS;
return TRY_AGAIN;
#undef in6
}
libc_hidden_def(gethostbyaddr_r)
#endif /* L_gethostbyaddr_r */
#ifdef L_gethostent_r
__UCLIBC_MUTEX_STATIC(mylock, PTHREAD_MUTEX_INITIALIZER);
static parser_t *hostp = NULL;
static smallint host_stayopen;
void endhostent_unlocked(void)
{
if (hostp) {
config_close(hostp);
hostp = NULL;
}
host_stayopen = 0;
}
void endhostent(void)
{
__UCLIBC_MUTEX_LOCK(mylock);
endhostent_unlocked();
__UCLIBC_MUTEX_UNLOCK(mylock);
}
void sethostent(int stay_open)
{
__UCLIBC_MUTEX_LOCK(mylock);
if (stay_open)
host_stayopen = 1;
__UCLIBC_MUTEX_UNLOCK(mylock);
}
int gethostent_r(struct hostent *result_buf, char *buf, size_t buflen,
struct hostent **result, int *h_errnop)
{
int ret;
__UCLIBC_MUTEX_LOCK(mylock);
if (hostp == NULL) {
hostp = __open_etc_hosts();
if (hostp == NULL) {
*result = NULL;
ret = TRY_AGAIN;
goto DONE;
}
}
ret = __read_etc_hosts_r(hostp, NULL, AF_INET, GETHOSTENT,
result_buf, buf, buflen, result, h_errnop);
if (!host_stayopen)
endhostent_unlocked();
DONE:
__UCLIBC_MUTEX_UNLOCK(mylock);
return ret;
}
libc_hidden_def(gethostent_r)
#endif /* L_gethostent_r */
#ifndef __UCLIBC_HAS_IPV6__
#define GETXX_BUFSZ (sizeof(struct in_addr) + sizeof(struct in_addr *) * 2 + \
/*sizeof(char *)*ALIAS_DIM */+ 384/*namebuffer*/ + 32/* margin */)
#else
#define GETXX_BUFSZ (sizeof(struct in6_addr) + sizeof(struct in6_addr *) * 2 + \
/*sizeof(char *)*ALIAS_DIM */+ 384/*namebuffer*/ + 32/* margin */)
#endif /* __UCLIBC_HAS_IPV6__ */
#define __INIT_GETXX_BUF(sz) \
if (buf == NULL) \
buf = (char *)__uc_malloc((sz));
#ifdef L_gethostent
struct hostent *gethostent(void)
{
static struct hostent hoste;
static char *buf = NULL;
struct hostent *host = NULL;
#ifndef __UCLIBC_HAS_IPV6__
#define HOSTENT_BUFSZ (sizeof(struct in_addr) + sizeof(struct in_addr *) * 2 + \
sizeof(char *)*ALIAS_DIM + BUFSZ /*namebuffer*/ + 2 /* margin */)
#else
#define HOSTENT_BUFSZ (sizeof(struct in6_addr) + sizeof(struct in6_addr *) * 2 + \
sizeof(char *)*ALIAS_DIM + BUFSZ /*namebuffer*/ + 2 /* margin */)
#endif /* __UCLIBC_HAS_IPV6__ */
__INIT_GETXX_BUF(HOSTENT_BUFSZ);
gethostent_r(&hoste, buf, HOSTENT_BUFSZ, &host, &h_errno);
return host;
}
#undef HOSTENT_BUFSZ
#endif /* L_gethostent */
#ifdef L_gethostbyname2
struct hostent *gethostbyname2(const char *name, int family)
{
static struct hostent hoste;
static char *buf = NULL;
struct hostent *hp;
__INIT_GETXX_BUF(GETXX_BUFSZ);
#ifndef __UCLIBC_HAS_IPV6__
if (family != AF_INET)
return (struct hostent*)NULL;
gethostbyname_r(name, &hoste, buf, GETXX_BUFSZ, &hp, &h_errno);
#else
gethostbyname2_r(name, family, &hoste, buf, GETXX_BUFSZ, &hp, &h_errno);
#endif /* __UCLIBC_HAS_IPV6__ */
return hp;
}
libc_hidden_def(gethostbyname2)
#endif /* L_gethostbyname2 */
#ifdef L_gethostbyname
struct hostent *gethostbyname(const char *name)
{
return gethostbyname2(name, AF_INET);
}
libc_hidden_def(gethostbyname)
#endif /* L_gethostbyname */
#ifdef L_gethostbyaddr
struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type)
{
static struct hostent hoste;
static char *buf = NULL;
struct hostent *hp;
__INIT_GETXX_BUF(GETXX_BUFSZ);
gethostbyaddr_r(addr, len, type, &hoste, buf, GETXX_BUFSZ, &hp, &h_errno);
return hp;
}
libc_hidden_def(gethostbyaddr)
#endif /* L_gethostbyaddr */
#ifdef L_res_comp
/*
* Expand compressed domain name 'comp_dn' to full domain name.
* 'msg' is a pointer to the begining of the message,
* 'eomorig' points to the first location after the message,
* 'exp_dn' is a pointer to a buffer of size 'length' for the result.
* Return size of compressed name or -1 if there was an error.
*/
int dn_expand(const u_char *msg, const u_char *eom, const u_char *src,
char *dst, int dstsiz)
{
int n = ns_name_uncompress(msg, eom, src, dst, (size_t)dstsiz);
if (n > 0 && dst[0] == '.')
dst[0] = '\0';
return n;
}
libc_hidden_def(dn_expand)
/*
* Pack domain name 'exp_dn' in presentation form into 'comp_dn'.
* Return the size of the compressed name or -1.
* 'length' is the size of the array pointed to by 'comp_dn'.
*/
int
dn_comp(const char *src, u_char *dst, int dstsiz,
u_char **dnptrs, u_char **lastdnptr)
{
return ns_name_compress(src, dst, (size_t) dstsiz,
(const u_char **) dnptrs,
(const u_char **) lastdnptr);
}
libc_hidden_def(dn_comp)
#endif /* L_res_comp */
#ifdef L_ns_name
/* Thinking in noninternationalized USASCII (per the DNS spec),
* is this character visible and not a space when printed ?
*/
static int printable(int ch)
{
return (ch > 0x20 && ch < 0x7f);
}
/* Thinking in noninternationalized USASCII (per the DNS spec),
* is this characted special ("in need of quoting") ?
*/
static int special(int ch)
{
switch (ch) {
case 0x22: /* '"' */
case 0x2E: /* '.' */
case 0x3B: /* ';' */
case 0x5C: /* '\\' */
/* Special modifiers in zone files. */
case 0x40: /* '@' */
case 0x24: /* '$' */
return 1;
default:
return 0;
}
}
/*
* ns_name_uncompress(msg, eom, src, dst, dstsiz)
* Expand compressed domain name to presentation format.
* return:
* Number of bytes read out of `src', or -1 (with errno set).
* note:
* Root domain returns as "." not "".
*/
int ns_name_uncompress(const u_char *msg, const u_char *eom,
const u_char *src, char *dst, size_t dstsiz)
{
u_char tmp[NS_MAXCDNAME];
int n;
n = ns_name_unpack(msg, eom, src, tmp, sizeof tmp);
if (n == -1)
return -1;
if (ns_name_ntop(tmp, dst, dstsiz) == -1)
return -1;
return n;
}
libc_hidden_def(ns_name_uncompress)
/*
* ns_name_ntop(src, dst, dstsiz)
* Convert an encoded domain name to printable ascii as per RFC1035.
* return:
* Number of bytes written to buffer, or -1 (with errno set)
* notes:
* The root is returned as "."
* All other domains are returned in non absolute form
*/
int ns_name_ntop(const u_char *src, char *dst, size_t dstsiz)
{
const u_char *cp;
char *dn, *eom;
u_char c;
u_int n;
cp = src;
dn = dst;
eom = dst + dstsiz;
while ((n = *cp++) != 0) {
if ((n & NS_CMPRSFLGS) != 0) {
/* Some kind of compression pointer. */
__set_errno(EMSGSIZE);
return -1;
}
if (dn != dst) {
if (dn >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
*dn++ = '.';
}
if (dn + n >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
for (; n > 0; n--) {
c = *cp++;
if (special(c)) {
if (dn + 1 >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
*dn++ = '\\';
*dn++ = (char)c;
} else if (!printable(c)) {
if (dn + 3 >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
*dn++ = '\\';
*dn++ = "0123456789"[c / 100];
c = c % 100;
*dn++ = "0123456789"[c / 10];
*dn++ = "0123456789"[c % 10];
} else {
if (dn >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
*dn++ = (char)c;
}
}
}
if (dn == dst) {
if (dn >= eom) {
__set_errno(EMSGSIZE);
return -1;
}
*dn++ = '.';
}
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