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dirmngr: New configure option --disable-libdns.
* configure.ac: Add option --disable-libdns (USE_LIBDNS): New ac_subst and am_conditional. (USE_C99_CFLAGS): Set only if libdns is used. * dirmngr/Makefile.am (dirmngr_SOURCES): Move dns.c and dns.h to ... (dirmngr_SOURCES) [USE_LIBDNS0: here. (t_common_src): Ditto. * dirmngr/dirmngr.c (oRecursiveResolver): New constant. (opts): New option "--recursive-resolver". (parse_rereadable_options): Set option. * dirmngr/t-dns-stuff.c (main): Add option --recursive-resolver. * dirmngr/server.c (cmd_getinfo): Depend output of "dnsinfo" on the new variables. * dirmngr/dns-stuff.c: Include dns.h only if USE_DNSLIB is defined. Also build and call dnslib functions only if USE_DNSLIB is defined. (recursive_resolver): New var. (enable_recursive_resolver): New func. (recursive_resolver_p): New func. -- In case users run into problems building GnuPG, the configure option allows to disable that support and continue w/o Tor support using the system resolver. --recursive-resolver was easy enough to implement and may be useful in some situation. It does not fully work, though. Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch
parent
3c2a7918ea
commit
d34a2bb410
9 changed files with 117 additions and 11 deletions
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@ -47,7 +47,9 @@
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#include <unistd.h>
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/* William Ahern's DNS library, included as a source copy. */
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#include "dns.h"
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#ifdef USE_LIBDNS
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# include "dns.h"
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#endif
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/* dns.c has a dns_p_free but it is not exported. We use our own
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* wrapper here so that we do not accidentally use xfree which would
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@ -101,6 +103,9 @@
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/* If set force the use of the standard resolver. */
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static int standard_resolver;
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/* If set use recursive resolver when available. */
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static int recursive_resolver;
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/* If set Tor mode shall be used. */
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static int tor_mode;
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@ -111,6 +116,7 @@ static char tor_nameserver[40+20];
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/* A string to hold the credentials presented to Tor. */
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static char tor_credentials[50];
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#ifdef USE_LIBDNS
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/* Libdns gobal data. */
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struct
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{
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@ -120,7 +126,7 @@ struct
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struct sockaddr_storage socks_host;
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} libdns;
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#endif /*USE_LIBDNS*/
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/* Calling this function with YES set to True forces the use of the
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* standard resolver even if dirmngr has been built with support for
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@ -140,6 +146,27 @@ standard_resolver_p (void)
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}
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/* Calling this function with YES switches libdns into recursive mode.
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* It has no effect on the standard resolver. */
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void
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enable_recursive_resolver (int yes)
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{
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recursive_resolver = yes;
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}
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/* Return true iff the recursive resolver is used. */
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int
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recursive_resolver_p (void)
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{
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#if USE_LIBDNS
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return !standard_resolver && recursive_resolver;
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#else
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return 0;
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#endif
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}
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/* Sets the module in Tor mode. Returns 0 is this is possible or an
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error code. */
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gpg_error_t
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@ -233,6 +260,7 @@ map_eai_to_gpg_error (int ec)
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}
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#ifdef USE_LIBDNS
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static gpg_error_t
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libdns_error_to_gpg_error (int serr)
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{
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@ -266,8 +294,10 @@ libdns_error_to_gpg_error (int serr)
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}
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return gpg_error (ec);
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}
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#endif /*USE_LIBDNS*/
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#ifdef USE_LIBDNS
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static gpg_error_t
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libdns_init (void)
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{
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@ -297,7 +327,9 @@ libdns_init (void)
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goto leave;
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/* dns_hints_local for stub mode, dns_hints_root for recursive. */
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libdns.hints = dns_hints_local (libdns.resolv_conf, &error);
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libdns.hints = (recursive_resolver
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? dns_hints_root (libdns.resolv_conf, &error)
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: dns_hints_local (libdns.resolv_conf, &error));
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if (! libdns.hints)
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goto leave;
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@ -305,8 +337,10 @@ libdns_init (void)
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leave:
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return libdns_error_to_gpg_error (error);
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}
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#endif /*USE_LIBDNS*/
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#ifdef USE_LIBDNS
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static gpg_error_t
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resolve_name_libdns (const char *name, unsigned short port,
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int want_family, int want_socktype,
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@ -431,6 +465,7 @@ resolve_name_libdns (const char *name, unsigned short port,
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return err;
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}
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#endif /*USE_LIBDNS*/
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/* Resolve a name using the standard system function. */
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@ -615,9 +650,11 @@ resolve_dns_name (const char *name, unsigned short port,
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int want_family, int want_socktype,
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dns_addrinfo_t *r_ai, char **r_canonname)
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{
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#ifdef USE_LIBDNS
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if (!standard_resolver)
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return resolve_name_libdns (name, port, want_family, want_socktype,
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r_ai, r_canonname);
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#endif /*USE_LIBDNS*/
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return resolve_name_standard (name, port, want_family, want_socktype,
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r_ai, r_canonname);
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@ -714,6 +751,7 @@ is_onion_address (const char *name)
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/* libdns version of get_dns_cert. */
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#ifdef USE_LIBDNS
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static gpg_error_t
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get_dns_cert_libdns (const char *name, int want_certtype,
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void **r_key, size_t *r_keylen,
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@ -726,7 +764,6 @@ get_dns_cert_libdns (const char *name, int want_certtype,
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struct dns_rr_i rri;
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char host[DNS_D_MAXNAME + 1];
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int derr;
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int srvcount = 0;
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int qtype;
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/* Gte the query type from WANT_CERTTYPE (which in general indicates
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@ -907,6 +944,7 @@ get_dns_cert_libdns (const char *name, int want_certtype,
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dns_res_close (res);
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return err;
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}
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#endif /*USE_LIBDNS*/
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/* Standard resolver version of get_dns_cert. */
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@ -1135,9 +1173,11 @@ get_dns_cert (const char *name, int want_certtype,
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*r_fprlen = 0;
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*r_url = NULL;
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#ifdef USE_LIBDNS
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if (!standard_resolver)
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return get_dns_cert_libdns (name, want_certtype, r_key, r_keylen,
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r_fpr, r_fprlen, r_url);
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#endif /*USE_LIBDNS*/
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return get_dns_cert_standard (name, want_certtype, r_key, r_keylen,
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r_fpr, r_fprlen, r_url);
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@ -1160,6 +1200,7 @@ priosort(const void *a,const void *b)
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/* Libdns based helper for getsrv. Note that it is expected that NULL
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* is stored at the address of LIST and 0 is stored at the address of
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* R_COUNT. */
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#ifdef USE_LIBDNS
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static gpg_error_t
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getsrv_libdns (const char *name, struct srventry **list, int *r_count)
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{
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@ -1274,6 +1315,7 @@ getsrv_libdns (const char *name, struct srventry **list, int *r_count)
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dns_res_close (res);
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return err;
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}
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#endif /*USE_LIBDNS*/
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/* Standard resolver based helper for getsrv. Note that it is
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@ -1412,9 +1454,11 @@ getsrv (const char *name, struct srventry **list)
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*list = NULL;
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srvcount = 0;
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#ifdef USE_LIBDNS
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if (!standard_resolver)
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err = getsrv_libdns (name, list, &srvcount);
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else
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#endif /*USE_LIBDNS*/
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err = getsrv_standard (name, list, &srvcount);
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if (err)
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@ -1498,6 +1542,7 @@ getsrv (const char *name, struct srventry **list)
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#ifdef USE_LIBDNS
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/* libdns version of get_dns_cname. */
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gpg_error_t
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get_dns_cname_libdns (const char *name, char **r_cname)
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@ -1505,7 +1550,6 @@ get_dns_cname_libdns (const char *name, char **r_cname)
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gpg_error_t err;
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struct dns_resolver *res = NULL;
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struct dns_packet *ans = NULL;
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struct dns_rr rr;
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struct dns_cname cname;
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int derr;
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@ -1582,6 +1626,7 @@ get_dns_cname_libdns (const char *name, char **r_cname)
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dns_res_close (res);
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return err;
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}
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#endif /*USE_LIBDNS*/
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/* Standard resolver version of get_dns_cname. */
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@ -1673,8 +1718,10 @@ get_dns_cname (const char *name, char **r_cname)
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{
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*r_cname = NULL;
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#ifdef USE_LIBDNS
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if (!standard_resolver)
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return get_dns_cname_libdns (name, r_cname);
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#endif /*USE_LIBDNS*/
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return get_dns_cname_standard (name, r_cname);
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}
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