The Tor Browser: other-licenses/android/resolv_private.h@97036ab72558 (annotated)

other-licenses/android/resolv_private.h@97036ab72558 (annotated)

other-licenses/android/resolv_private.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*	$NetBSD: resolv.h,v 1.31 2005/12/26 19:01:47 perry Exp $	*/
 /*
  * Copyright (c) 1983, 1987, 1989
  *    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.
  * 3. 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.
  */
 /*
  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  * 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 ISC DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC 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.
  */
 /*
  *	@(#)resolv.h	8.1 (Berkeley) 6/2/93
  *	Id: resolv.h,v 1.7.2.11.4.2 2004/06/25 00:41:05 marka Exp
  */
 /*
  * This version of this file is derived from Android 2.3 "Gingerbread",
  * which contains uncredited changes by Android/Google developers.  It has
  * been modified in 2011 for use in the Android build of Mozilla Firefox by
  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
  * and Steve Workman <sjhworkman@gmail.com>).
  * These changes are offered under the same license as the original NetBSD
  * file, whose copyright and license are unchanged above.
  */
 #ifndef _RESOLV_PRIVATE_H_
 #define	_RESOLV_PRIVATE_H_
 #include <resolv.h>
 #include "resolv_static.h"
 /*
  * Revision information.  This is the release date in YYYYMMDD format.
  * It can change every day so the right thing to do with it is use it
  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
  * compare for equality; rather, use it to determine whether your resolver
  * is new enough to contain a certain feature.
  */
 #define	__RES	20030124
 /*
  * This used to be defined in res_query.c, now it's in herror.c.
  * [XXX no it's not.  It's in irs/irs_data.c]
  * It was
  * never extern'd by any *.h file before it was placed here.  For thread
  * aware programs, the last h_errno value set is stored in res->h_errno.
  *
  * XXX:	There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
  *	(and __h_errno_set) to the public via <resolv.h>.
  * XXX:	__h_errno_set is really part of IRS, not part of the resolver.
  *	If somebody wants to build and use a resolver that doesn't use IRS,
  *	what do they do?  Perhaps something like
  *		#ifdef WANT_IRS
  *		# define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
  *		#else
  *		# define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
  *		#endif
  */
 #define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
 struct __res_state; /* forward */
 /*
  * Resolver configuration file.
  * Normally not present, but may contain the address of the
  * initial name server(s) to query and the domain search list.
  */
 #ifndef _PATH_RESCONF
 #ifdef ANDROID_CHANGES
 #define _PATH_RESCONF        "/etc/ppp/resolv.conf"
 #else
 #define _PATH_RESCONF        "/etc/resolv.conf"
 #endif
 #endif
 typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
 	res_sendhookact;
 typedef res_sendhookact (*res_send_qhook)(struct sockaddr * const *,
 					      const u_char **, int *,
 					      u_char *, int, int *);
 typedef res_sendhookact (*res_send_rhook)(const struct sockaddr *,
 					      const u_char *, int, u_char *,
 					      int, int *);
 struct res_sym {
 	int		number;	   /* Identifying number, like T_MX */
 	const char *	name;	   /* Its symbolic name, like "MX" */
 	const char *	humanname; /* Its fun name, like "mail exchanger" */
 };
 /*
  * Global defines and variables for resolver stub.
  */
 #define	MAXNS			3	/* max # name servers we'll track */
 #define	MAXDFLSRCH		3	/* # default domain levels to try */
 #define	MAXDNSRCH		6	/* max # domains in search path */
 #define	LOCALDOMAINPARTS	2	/* min levels in name that is "local" */
 #define	RES_TIMEOUT		5	/* min. seconds between retries */
 #define	MAXRESOLVSORT		10	/* number of net to sort on */
 #define	RES_MAXNDOTS		15	/* should reflect bit field size */
 #define	RES_MAXRETRANS		30	/* only for resolv.conf/RES_OPTIONS */
 #define	RES_MAXRETRY		5	/* only for resolv.conf/RES_OPTIONS */
 #define	RES_DFLRETRY		2	/* Default #/tries. */
 #define	RES_MAXTIME		65535	/* Infinity, in milliseconds. */
 struct __res_state_ext;
 struct __res_state {
 	int	retrans;	 	/* retransmission time interval */
 	int	retry;			/* number of times to retransmit */
 #ifdef sun
 	u_int	options;		/* option flags - see below. */
 #else
 	u_long	options;		/* option flags - see below. */
 #endif
 	int	nscount;		/* number of name servers */
 	struct sockaddr_in
 		nsaddr_list[MAXNS];	/* address of name server */
 #define	nsaddr	nsaddr_list[0]		/* for backward compatibility */
 	u_short	id;			/* current message id */
 	char	*dnsrch[MAXDNSRCH+1];	/* components of domain to search */
 	char	defdname[256];		/* default domain (deprecated) */
 #ifdef sun
 	u_int	pfcode;			/* RES_PRF_ flags - see below. */
 #else
 	u_long	pfcode;			/* RES_PRF_ flags - see below. */
 #endif
 	unsigned ndots:4;		/* threshold for initial abs. query */
 	unsigned nsort:4;		/* number of elements in sort_list[] */
 	char	unused[3];
 	struct {
 		struct in_addr	addr;
 		uint32_t	mask;
 	} sort_list[MAXRESOLVSORT];
 #ifdef __OLD_RES_STATE
 	char lookups[4];
 #else
 	res_send_qhook qhook;		/* query hook */
 	res_send_rhook rhook;		/* response hook */
 	int	res_h_errno;		/* last one set for this context */
 	int	_vcsock;		/* PRIVATE: for res_send VC i/o */
 	u_int	_flags;			/* PRIVATE: see below */
 	u_int	_pad;			/* make _u 64 bit aligned */
 	union {
 		/* On an 32-bit arch this means 512b total. */
 		char	pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
 		struct {
 			uint16_t		nscount;
 			uint16_t		nstimes[MAXNS];	/* ms. */
 			int			nssocks[MAXNS];
 			struct __res_state_ext *ext;	/* extention for IPv6 */
 		} _ext;
 	} _u;
 #endif
         struct res_static   rstatic[1];
 };
 typedef struct __res_state *res_state;
 union res_sockaddr_union {
 	struct sockaddr_in	sin;
 #ifdef IN6ADDR_ANY_INIT
 	struct sockaddr_in6	sin6;
 #endif
 #ifdef ISC_ALIGN64
 	int64_t			__align64;	/* 64bit alignment */
 #else
 	int32_t			__align32;	/* 32bit alignment */
 #endif
 	char			__space[128];   /* max size */
 };
 /*
  * Resolver flags (used to be discrete per-module statics ints).
  */
 #define	RES_F_VC	0x00000001	/* socket is TCP */
 #define	RES_F_CONN	0x00000002	/* socket is connected */
 #define	RES_F_EDNS0ERR	0x00000004	/* EDNS0 caused errors */
 #define	RES_F__UNUSED	0x00000008	/* (unused) */
 #define	RES_F_LASTMASK	0x000000F0	/* ordinal server of last res_nsend */
 #define	RES_F_LASTSHIFT	4		/* bit position of LASTMASK "flag" */
 #define	RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
 /* res_findzonecut2() options */
 #define	RES_EXHAUSTIVE	0x00000001	/* always do all queries */
 #define	RES_IPV4ONLY	0x00000002	/* IPv4 only */
 #define	RES_IPV6ONLY	0x00000004	/* IPv6 only */
 /*
  * Resolver options (keep these in synch with res_debug.c, please)
  */
 #define RES_INIT	0x00000001	/* address initialized */
 #define RES_DEBUG	0x00000002	/* print debug messages */
 #define RES_AAONLY	0x00000004	/* authoritative answers only (!IMPL)*/
 #define RES_USEVC	0x00000008	/* use virtual circuit */
 #define RES_PRIMARY	0x00000010	/* query primary server only (!IMPL) */
 #define RES_IGNTC	0x00000020	/* ignore trucation errors */
 #define RES_RECURSE	0x00000040	/* recursion desired */
 #define RES_DEFNAMES	0x00000080	/* use default domain name */
 #define RES_STAYOPEN	0x00000100	/* Keep TCP socket open */
 #define RES_DNSRCH	0x00000200	/* search up local domain tree */
 #define	RES_INSECURE1	0x00000400	/* type 1 security disabled */
 #define	RES_INSECURE2	0x00000800	/* type 2 security disabled */
 #define	RES_NOALIASES	0x00001000	/* shuts off HOSTALIASES feature */
 #define	RES_USE_INET6	0x00002000	/* use/map IPv6 in gethostbyname() */
 #define RES_ROTATE	0x00004000	/* rotate ns list after each query */
 #define	RES_NOCHECKNAME	0x00008000	/* do not check names for sanity. */
 #define	RES_KEEPTSIG	0x00010000	/* do not strip TSIG records */
 #define	RES_BLAST	0x00020000	/* blast all recursive servers */
 #define RES_NOTLDQUERY	0x00100000	/* don't unqualified name as a tld */
 #define RES_USE_DNSSEC	0x00200000	/* use DNSSEC using OK bit in OPT */
 /* #define RES_DEBUG2	0x00400000 */	/* nslookup internal */
 /* KAME extensions: use higher bit to avoid conflict with ISC use */
 #define RES_USE_DNAME	0x10000000	/* use DNAME */
 #define RES_USE_EDNS0	0x40000000	/* use EDNS0 if configured */
 #define RES_NO_NIBBLE2	0x80000000	/* disable alternate nibble lookup */
 #define RES_DEFAULT	(RES_RECURSE | RES_DEFNAMES | \
 			 RES_DNSRCH | RES_NO_NIBBLE2)
 /*
  * Resolver "pfcode" values.  Used by dig.
  */
 #define RES_PRF_STATS	0x00000001
 #define RES_PRF_UPDATE	0x00000002
 #define RES_PRF_CLASS   0x00000004
 #define RES_PRF_CMD	0x00000008
 #define RES_PRF_QUES	0x00000010
 #define RES_PRF_ANS	0x00000020
 #define RES_PRF_AUTH	0x00000040
 #define RES_PRF_ADD	0x00000080
 #define RES_PRF_HEAD1	0x00000100
 #define RES_PRF_HEAD2	0x00000200
 #define RES_PRF_TTLID	0x00000400
 #define RES_PRF_HEADX	0x00000800
 #define RES_PRF_QUERY	0x00001000
 #define RES_PRF_REPLY	0x00002000
 #define RES_PRF_INIT	0x00004000
 #define RES_PRF_TRUNC	0x00008000
 /*			0x00010000	*/
 /* Things involving an internal (static) resolver context. */
 __BEGIN_DECLS
 extern struct __res_state *__res_get_state(void);
 extern void __res_put_state(struct __res_state *);
 #ifndef ANDROID_CHANGES
 /*
  * Source and Binary compatibility; _res will not work properly
  * with multi-threaded programs.
  */
 extern struct __res_state *__res_state(void);
 #define _res (*__res_state())
 #endif
 __END_DECLS
 #ifndef __BIND_NOSTATIC
 #define fp_nquery		__fp_nquery
 #define fp_query		__fp_query
 #define hostalias		__hostalias
 #define p_query			__p_query
 #define res_close		__res_close
 #define res_opt			__res_opt
 #define res_isourserver		__res_isourserver
 #define	res_querydomain		__res_querydomain
 #define res_send		__res_send
 #define res_sendsigned		__res_sendsigned
 #ifdef BIND_RES_POSIX3
 #define	dn_expand	__dn_expand
 #define	res_init	__res_init
 #define	res_query	__res_query
 #define	res_search	__res_search
 #define	res_mkquery	__res_mkquery
 #endif
 __BEGIN_DECLS
 void		fp_nquery(const u_char *, int, FILE *);
 void		fp_query(const u_char *, FILE *);
 const char *	hostalias(const char *);
 void		p_query(const u_char *);
 void		res_close(void);
 int		res_init(void);
 int		res_opt(int, u_char *, int, int);
 int		res_isourserver(const struct sockaddr_in *);
 int		res_mkquery(int, const char *, int, int, const u_char *, int, const u_char *, u_char *, int);
 int		res_query(const char *, int, int, u_char *, int);
 int		res_querydomain(const char *, const char *, int, int, u_char *, int);
 int		res_search(const char *, int, int, u_char *, int);
 int		res_send(const u_char *, int, u_char *, int);
 int		res_sendsigned(const u_char *, int, ns_tsig_key *, u_char *, int);
 __END_DECLS
 #endif
 #if !defined(SHARED_LIBBIND) || defined(LIB)
 /*
  * If libbind is a shared object (well, DLL anyway)
  * these externs break the linker when resolv.h is
  * included by a lib client (like named)
  * Make them go away if a client is including this
  *
  */
 extern const struct res_sym __p_key_syms[];
 extern const struct res_sym __p_cert_syms[];
 extern const struct res_sym __p_class_syms[];
 extern const struct res_sym __p_type_syms[];
 extern const struct res_sym __p_rcode_syms[];
 #endif /* SHARED_LIBBIND */
 #ifndef ADNROID_CHANGES
 #define b64_ntop		__b64_ntop
 #define b64_pton		__b64_pton
 #endif
 #define dn_comp			__dn_comp
 #define dn_count_labels		__dn_count_labels
 #define dn_skipname		__dn_skipname
 #define fp_resstat		__fp_resstat
 #define loc_aton		__loc_aton
 #define loc_ntoa		__loc_ntoa
 #define p_cdname		__p_cdname
 #define p_cdnname		__p_cdnname
 #define p_class			__p_class
 #define p_fqname		__p_fqname
 #define p_fqnname		__p_fqnname
 #define p_option		__p_option
 #define p_secstodate		__p_secstodate
 #define p_section		__p_section
 #define p_time			__p_time
 #define p_type			__p_type
 #define p_rcode			__p_rcode
 #define p_sockun		__p_sockun
 #define putlong			__putlong
 #define putshort		__putshort
 #define res_dnok		__res_dnok
 #define res_findzonecut		__res_findzonecut
 #define res_findzonecut2	__res_findzonecut2
 #define res_hnok		__res_hnok
 #define res_hostalias		__res_hostalias
 #define res_mailok		__res_mailok
 #define res_nameinquery		__res_nameinquery
 #define res_nclose		__res_nclose
 #define res_ninit		__res_ninit
 #define res_nmkquery		__res_nmkquery
 #define res_pquery		__res_pquery
 #define res_nquery		__res_nquery
 #define res_nquerydomain	__res_nquerydomain
 #define res_nsearch		__res_nsearch
 #define res_nsend		__res_nsend
 #define res_nsendsigned		__res_nsendsigned
 #define res_nisourserver	__res_nisourserver
 #define res_ownok		__res_ownok
 #define res_queriesmatch	__res_queriesmatch
 #define res_randomid		__res_randomid
 #define sym_ntop		__sym_ntop
 #define sym_ntos		__sym_ntos
 #define sym_ston		__sym_ston
 #define res_nopt		__res_nopt
 #define res_ndestroy		__res_ndestroy
 #define	res_nametoclass		__res_nametoclass
 #define	res_nametotype		__res_nametotype
 #define	res_setservers		__res_setservers
 #define	res_getservers		__res_getservers
 #define	res_buildprotolist	__res_buildprotolist
 #define	res_destroyprotolist	__res_destroyprotolist
 #define	res_destroyservicelist	__res_destroyservicelist
 #define	res_get_nibblesuffix	__res_get_nibblesuffix
 #define	res_get_nibblesuffix2	__res_get_nibblesuffix2
 #define	res_ourserver_p		__res_ourserver_p
 #define	res_protocolname	__res_protocolname
 #define	res_protocolnumber	__res_protocolnumber
 #define	res_send_setqhook	__res_send_setqhook
 #define	res_send_setrhook	__res_send_setrhook
 #define	res_servicename		__res_servicename
 #define	res_servicenumber	__res_servicenumber
 __BEGIN_DECLS
 int		res_hnok(const char *);
 int		res_ownok(const char *);
 int		res_mailok(const char *);
 int		res_dnok(const char *);
 int		sym_ston(const struct res_sym *, const char *, int *);
 const char *	sym_ntos(const struct res_sym *, int, int *);
 const char *	sym_ntop(const struct res_sym *, int, int *);
 #ifndef ANDROID_CHANGES
 int		b64_ntop(u_char const *, size_t, char *, size_t);
 int		b64_pton(char const *, u_char *, size_t);
 #endif
 int		loc_aton(const char *, u_char *);
 const char *	loc_ntoa(const u_char *, char *);
 int		dn_skipname(const u_char *, const u_char *);
 void		putlong(uint32_t, u_char *);
 void		putshort(uint16_t, u_char *);
 #ifndef __ultrix__
 uint16_t	_getshort(const u_char *);
 uint32_t	_getlong(const u_char *);
 #endif
 const char *	p_class(int);
 const char *	p_time(uint32_t);
 const char *	p_type(int);
 const char *	p_rcode(int);
 const char *	p_sockun(union res_sockaddr_union, char *, size_t);
 const u_char *	p_cdnname(const u_char *, const u_char *, int, FILE *);
 const u_char *	p_cdname(const u_char *, const u_char *, FILE *);
 const u_char *	p_fqnname(const u_char *, const u_char *,
 			       int, char *, int);
 const u_char *	p_fqname(const u_char *, const u_char *, FILE *);
 const char *	p_option(u_long);
 char *		p_secstodate(u_long);
 int		dn_count_labels(const char *);
 int		dn_comp(const char *, u_char *, int, u_char **, u_char **);
 int		dn_expand(const u_char *, const u_char *, const u_char *,
 			       char *, int);
 u_int		res_randomid(void);
 int		res_nameinquery(const char *, int, int, const u_char *,
 				     const u_char *);
 int		res_queriesmatch(const u_char *, const u_char *,
 				      const u_char *, const u_char *);
 const char *	p_section(int, int);
 /* Things involving a resolver context. */
 int		res_ninit(res_state);
 int		res_nisourserver(const res_state, const struct sockaddr_in *);
 void		fp_resstat(const res_state, FILE *);
 void		res_pquery(const res_state, const u_char *, int, FILE *);
 const char *	res_hostalias(const res_state, const char *, char *, size_t);
 int		res_nquery(res_state, const char *, int, int, u_char *, int);
 int		res_nsearch(res_state, const char *, int, int, u_char *, int);
 int		res_nquerydomain(res_state, const char *, const char *,
 				      int, int, u_char *, int);
 int		res_nmkquery(res_state, int, const char *, int, int,
 				  const u_char *, int, const u_char *,
 				  u_char *, int);
 int		res_nsend(res_state, const u_char *, int, u_char *, int);
 int		res_nsendsigned(res_state, const u_char *, int,
 				     ns_tsig_key *, u_char *, int);
 int		res_findzonecut(res_state, const char *, ns_class, int,
 				     char *, size_t, struct in_addr *, int);
 int		res_findzonecut2(res_state, const char *, ns_class, int,
 				      char *, size_t,
 				      union res_sockaddr_union *, int);
 void		res_nclose(res_state);
 int		res_nopt(res_state, int, u_char *, int, int);
 void		res_send_setqhook(res_send_qhook);
 void		res_send_setrhook(res_send_rhook);
 int		__res_vinit(res_state, int);
 void		res_destroyservicelist(void);
 const char *	res_servicename(uint16_t, const char *);
 const char *	res_protocolname(int);
 void		res_destroyprotolist(void);
 void		res_buildprotolist(void);
 const char *	res_get_nibblesuffix(res_state);
 const char *	res_get_nibblesuffix2(res_state);
 void		res_ndestroy(res_state);
 uint16_t	res_nametoclass(const char *, int *);
 uint16_t	res_nametotype(const char *, int *);
 void		res_setservers(res_state,
 				    const union res_sockaddr_union *, int);
 int		res_getservers(res_state,
 				    union res_sockaddr_union *, int);
 int res_get_dns_changed();
 u_int  res_randomid(void);
 __END_DECLS
 #endif /* !_RESOLV_PRIVATE_H_ */

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