* common/t-iobuf.c (content_filter): If there is nothing to read,
don't forget to set *LEN to 0.
(main): Fix checks.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/status.h (STATUS_FAILURE): New.
* g10/cpr.c (write_status_failure): New.
* g10/gpg.c (main): Call write_status_failure for all commands which
print an error message here.
* g10/call-agent.c (start_agent): Print an STATUS_ERROR if we can't
set the pinentry mode.
--
This status line can be used similar to the error code returned by
commands send over the Assuan interface in gpgsm. We don't emit them
in gpgsm because there we already have that Assuan interface to return
proper error code. This change helps GPGME to return better error
codes.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/iobuf.c (iobuf_read): Make control flow more obvious.
(iobuf_get_filelength): Likewise.
(iobuf_get_fd): Likewise.
(iobuf_seek): Likewise.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_alloc): Check that BUFSIZE is not 0.
(iobuf_readbyte): Check that A is an input filter. Check that the
amount of read data is at most the amount of buffered data.
(iobuf_read): Check that A is an input filter.
(iobuf_writebyte): Check that A is not an input filter.
(iobuf_writestr): Check that A is not an input filter.
(iobuf_flush_temp): Check that A is not an input filter.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_push_filter2): If the head filter is a temp
filter, use IOBUF_BUFFER_SIZE for the new filter.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_push_filter2): If the pipeline is an output or
temp pipeline, the new filter shouldn't assume ownership of the old
head's internal buffer: the data was written before the filter was
added.
* common/t-iobuf.c (double_filter): New function.
(main): Add test cases for the above bug.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_temp_to_buffer): Flush each filter in the
pipeline and copy the data from the last (not the first) filter's
internal buffer.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (do_open): New function, which is a generalization of
iobuf_open, iobuf_Create, iobuf_openrw.
(iobuf_open): Call do_open.
(iobuf_create): Likewise.
(iobuf_openrw): Likewise.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.h (iobuf_open_fd_or_name): Remove prototype. Replace
use with either iobuf_open or iobuf_fdopen_nc, as appropriate.
* common/iobuf.c (iobuf_open): Remove function.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_cancel): Don't abort freeing a pipeline if
freeing a filter fails. This needs to a memory leak. Instead, keep
freeing and return the error code of the first filter that fails.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (underflow): Take additional parameter
clear_pending_eof. If not set, don't clear a pending eof when
returning EOF. Update callers.
(iobuf_peek): Fill the internal buffer, if needed, to be able to
better satisfy any request.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (underflow): Don't require that the buffer be empty.
When called, fill any available space.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_read_line): Be more careful with boundary
conditions.
* common/iobuf.h: Include <gpg-error.h>.
* common/t-iobuf.c: New file.
* common/Makefile.am (module_tests): Add t-iobuf.
(t_mbox_util_LDADD): New variable.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c (iobuf_temp_with_content): Set the filter type to
IOBUF_INPUT, not IOBUF_TEMP, which is only for output filters that
write into a dynamic buffer.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.h (struct iobuf_struct): Remove field desc.
* common/iobuf.c (iobuf_desc): New function. When a filter's
description is needed, use this instead of the filter's desc field.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.h (struct iobuf_struct): Clarify semantics of nofast.
Simplify use of nofast to implement just these semantics.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/iobuf.c: Move BLOCK_FILTER_INPUT,
BLOCK_FILTER_OUTPUT_BLOCK_FILTER_TEMP from here...
* common/iobuf.h: ... to here and rename to IOBUF_INPUT, IOBUF_OUTPUT
and IOBUF_TEMP, respectively. Where appropriate, use these macros
instead of a literal.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/status.h (INQUIRE_MAXLEN): New.
* g10/call-agent.c (default_inquire_cb): Send STATUS_INQUIRE_MAXLEN.
client when inquiring a passphrase over pinentry-loopback.
--
This is to inform a user about the maximum length of a passphrase. The
limit is the same that gpg-agent uses.
* common/iobuf.c (BLOCK_FILTER_INPUT): Define. Where appropriate, use
this instead of a literal.
(BLOCK_FILTER_OUTPUT): Likewise.
(BLOCK_FILTER_TEMP): Likewise.
--
Signed-off-by: Neal H. Walfield <neal@g10code.com>.
* common/openpgp-oid.c (oidtable): Change alias.
--
This is a cosmetic change so that common and expected common
algorithms line up nicely in a keylisting. For example:
pub ed25519/C68CE6D1ED0319C8 2015-08-06
uid [ultimate] Curve25519 Test 150806.1
sub cv25519/49238B9F0712C9BF 2015-08-06
sub rsa2048/8AEAF74014699D2C 2015-08-06
sub cv25519/8EC3776830B08736 2015-08-06
Signed-off-by: Werner Koch <wk@gnupg.org>
* agent/cvt-openpgp.c (get_keygrip): Handle Curve25519.
(convert_secret_key, convert_transfer_key): Ditto.
* common/openpgp-oid.c (oidtable): Add Curve25519.
(oid_crv25519, openpgp_oid_is_crv25519): New.
* common/util.h (openpgp_oid_is_crv25519): New.
* g10/ecdh.c (pk_ecdh_encrypt_with_shared_point): Handle the case
with Montgomery curve which uses x-only coordinate.
* g10/keygen.c (gen_ecc): Handle Curve25519.
(ask_curve): Change the API and second arg is to return subkey algo.
(generate_keypair, generate_subkeypair): Follow chage of ask_curve.
* g10/keyid.c (keygrip_from_pk): Handle Curve25519.
* g10/pkglue.c (pk_encrypt): Handle Curve25519.
* g10/pubkey-enc.c (get_it): Handle the case with Montgomery curve.
* scd/app-openpgp.c (ECC_FLAG_DJB_TWEAK): New.
(send_key_attr): Work with general ECC, Ed25519, and Curve25519.
(get_public_key): Likewise.
(ecc_writekey): Handle flag_djb_tweak.
--
When libgcrypt has Curve25519, GnuPG now supports Curve25519.
* common/openpgp-oid.c (openpgp_oid_to_curve): Add CANON argument.
* common/util.h: Update.
* g10/import.c (transfer_secret_keys): Follow the change.
* g10/keyid.c (pubkey_string): Likewise.
* g10/keylist.c (list_keyblock_print, list_keyblock_colon): Likewise.
* parse-packet.c (parse_key): Likewise.
* scd/app-openpgp.c (send_key_attr, get_public_key): Likewise.
--
Change the function so that caller can select canonical name of curve
or name for printing. Suggested by wk.
* common/i18n.c (USE_MSGCACHE): New.
(msgcache) [!USE_MSGCACHE]: Do not define.
(i18n_localegettext): Repalce #if conditions by USE_MSGCACHE.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/util.h: Provide replacement for GPGRT_ATTR_ macros when using
libgpg-error < 1.20.
* common/mischelp.h: Ditto.
* common/types.h: Ditto.
--
Given that libgpg-error is a dependency of all GnuPG related libraries
it is better to define such macros at only one place instead of having
similar macros at a lot of places. For now we need repalcement
macros, though.
* common/i18n.c (msg_cache_s, msg_cache_head_s): New.
(msgcache): New.
(i18n_localegettext): Implement locale dependent lookup.
--
This is the second and final part of the change to use the gpg
provided locale for Pinentry strings. It does not yet work on
Windows, though.
This commit should resolve
Debian-bug-id: 788983
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/session-env.c (stdenvnames): Add DBUS_SESSION_BUS_ADDRESS.
--
pinentry-gnome3 talks to the gcr prompter via dbus. Without this
environment variable, it can't find the correct session to talk to.
* agent/agent.h (LunderscorePROTO): New.
* common/util.h (GNUPG_GCC_ATTR_FORMAT_ARG): New.
* common/i18n.h (GNUPG_GCC_ATTR_FORMAT_ARG): New. Use for
i18n_localegettext. Expand LunderscorePROTO.
* agent/genkey.c (check_passphrase_constraints): Use xtryasprintf
again to keep the old translations.
--
Signed-off-by: Werner Koch <wk@gnupg.org>
* po/Makevars (XGETTEXT_OPTIONS): Add keyword "L_".
* common/i18n.c (i18n_localegettext): New stub.
* common/i18n.h: Expand the LunderscoreIMPL macro.
* agent/agent.h (L_): New.
(LunderscoreIMPL): New.
* agent/call-pinentry.c (setup_qualitybar): Add arg ctrl anc change
caller.
* agent/findkey.c (try_unprotect_cb): Add local var ctrl.
* agent/genkey.c (check_passphrase_constraints): Replace xtryasprintf
by xtrystrdup to avoid gcc warning. Unfortinately this changes the
string.
(agent_ask_new_passphrase): Cleanup the use of initial_errtext.
--
Static strings in gpg-agent need to be translated according to the
locale set by the caller. This is required so that a gpg-agent can be
started in one locale and a gpg can be run in another. If we don't do
this the static strings (prompt, buttons) are not or in the wrong
locale translated while dynamic strings (e.g. key description) uses
the locale of gpg.
This is only the first part of the change the actual local switching
still needs to be implemented.
Debian-bug-id: 788983
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/logging.h: Rename JNLIB_LOG_* to GPGRT_LOG_*.
* common/mischelp.h: Rename JNLIB_GCC_* to GPGRT_GCC_*.
--
JNLIB has no more meaning. Thus we switch to a GPGRT_ prefix in
anticipation that some code may eventually be moved to libgpg-error.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/libjnlib-config.h: Remove.
* common/common-defs.h (getenv) [HAVE_GETENV]: New. From removed
header.
(getpid) [HAVE_W32CE_SYSTEM]: New. From removed header.
* common/argparse.c: Include util.h and common-defs.h. Replace
jnlib_ macro names for non-GNUPG builds by x* names.
* common/dotlock.c: Ditto.
* common/logging.c: Include util.h and common-defs.h. Replace jnlib_
symbol names by x* names.
* common/strlist.c: Ditto.
* common/utf8conv.c: Ditto.
* common/w32-reg.c: Ditto.
* common/mischelp.c: Ditto. Also remove _jnlib_free.
* common/stringhelp.c: Ditto.
(JNLIB_LOG_WITH_PREFIX): Do not depend on this macro.
* common/logging.h (JNLIB_LOG_WITH_PREFIX): Do not depend on this
macro.
--
This is part 1 of the patches to merge the jnlib files into common/.
It does not make much sense to keep jnlib/ files separate. They are
not often use elsewhere and maintaining the complex marcos stuff is
too troublesome for the future.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/dns-cert.h: Move to ../dirmngr/.
* common/dns-cert.c: Move to ../dirmngr/. Change args to return the
key as a buffer.
* common/t-dns-cert.c: Move to ../dirmngr/.
* common/pka.c, common/pka.h, common/t-pka.c: Remove.
* dirmngr/server.c (data_line_cookie_write): Factor code out to
data_line_write and make it a wrapper for that.
(data_line_write): New.
(cmd_dns_cert): New.
(register_commands): Register new command.
* g10/Makefile.am (LDADD): Remove DNSLIBS.
* g10/call-dirmngr.c (dns_cert_parm_s): New.
(dns_cert_data_cb, dns_cert_status_cb): New.
(gpg_dirmngr_dns_cert): New.
(gpg_dirmngr_get_pka): New.
* g10/gpgv.c (gpg_dirmngr_get_pka): New dummy function.
* g10/keyserver.c (keyserver_import_cert): Replace get_dns_cert by
gpg_dirmngr_dns_cert.
(keyserver_import_pka): Replace get_pka_info by gpg_dirmngr_get_pka.
* g10/mainproc.c: Include call-dirmngr.h.
(pka_uri_from_sig): Add CTX arg. Replace get_pka_info by
gpg_dirmngr_get_pka.
--
With this patch gpg does not do any network access itself but uses
dirmngr for that. Note that we need to keep linking to NETLIBS due to
the logging code and because we need TCP for our socket emulation
under Windows. Probably also required for Solaris etc.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/convert.c (hex2str): Set ERRNO. Return adjusted COUNT.
--
hex2str is only used at one place for in-place converting an hex
encoded passphrase. This change does not affect this use. The change
is however useful to use the function for in-place conversion of
arbitrary hex encoded strings.
Take care for in-place conversion of a hex string encoding binary data
you need to use it this way:
if (hex2str (string, string, strlen (string) + 1, &length)
oops ("probably out of memory but see ERRNO");
for (i=0; i < length; i++)
foo (string[i));
Note that strlen() + 1.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/Makefile.am (t_jnlib_src): Remove t-support.c.
--
Since test programs are linked to libgcrypt and libgpg-error, there
is no need to include t-support.c.
GnuPG-bug-id: 1862, 1915
* g10/options.h (KEYSERVER_HTTP_PROXY): New.
(KEYSERVER_USE_TEMP_FILES, KEYSERVER_KEEP_TEMP_FILES): Remove.
(KEYSERVER_TIMEOUT): New.
* common/keyserver.h (KEYSERVER_TIMEOUT): Remove.
* g10/keyserver.c (keyserver_opts): Remove obsolete "use-temp-files"
and "keep-temp-files". Add "http-proxy" and "timeout".
(parse_keyserver_options): Remove 1.2 compatibility option
"honor-http_proxy". Remove "use-temp-files" and "keep-temp-files"
code.
--
Note that many of these options where implicitly used by passing any
unknown option down to the former keyserver helpers. The don't exist
anymore thus we need to make them explicit. Another patch will convey
them to dirmngr. Temp files are not anymore used thus they can be
removed and will be ignored when used.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/gettime.c (gnupg_gmtime): New.
(gnupg_get_isotime): Use it. Also take care of an gmtime_t returning
an error.
--
The fix in gnupg_get_isotime is only to cover up a theoretical broken
time (e.g. a value of (time_t)(-2) which is not mapped beyond 2038 on
32 bit systems).
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/gettime.c (isotime_human_p): Add arg date_only.
(isodate_human_to_tm): New.
* common/t-gettime.c (test_isodate_human_to_tm): New.
(main): Call new test.
--
This function in intended as replacement for
strptime (foo, "%Y-%m-%d", &bar)
which is not available under Windows.
* common/gettime.h (parse_timestamp): New declaration.
* common/gettime.c (_win32_timegm): New function imported from
gpgme/src/conversion.c:_gpgme_timegm.
(parse_timestamp): New function imported from
gpgme/src/conversion.c:_gpgme_parse_timestamp.
--
Signed-off-by: Neal H. Walfield <neal@g10code.de>
* common/stringhelp.h (strsplit): New declaration.
* common/stringhelp.c (strsplit): New function.
* common/t-stringhelp.c (test_strsplit): New function.
(main): Call it here.
--
Signed-off-by: Neal H. Walfield <neal@g10code.de>
* common/mbox-util.c (mem_count_chr): New.
(my_memstr): New.
(has_invalid_email_chars): Change args to work on a buffer.
(is_valid_mailbox_mem): New.
(is_valid_mailbox): Rewrite to use is_valid_mailbox_mem.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/http.c (send_request): Set the requested for SNI.
* dirmngr/ks-engine-hkp.c (map_host): Return the poolname and not
the selecting a host.
--
GnuPG-bug-id: 1792
Thanks to davidw for figuring out the problem.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/argparse.c (show_help): Take care of flag value
(usage): Ditto.
--
It is common that the long usage note starts with the short usage
note. The new flag feature allows to combine both.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/openpgp-oid.c (openpgp_oid_to_str): Take care of
gcry_mpi_get_opaque returning NULL. Remove useless condition !BUF.
--
It is possible that an opaque MPI stores just a NULL pointer. Take
care of that before incrementing the pointer. We return an error in
this case because at least a length byte is required.
Found due to hint from stack 0.3:
bug: anti-simplify
model: |
%tobool15 = icmp ne i8* %incdec.ptr, null, !dbg !567
--> true
stack:
- /home/wk/s/gnupg/common/openpgp-oid.c:220:0
ncore: 1
core:
- /home/wk/s/gnupg/common/openpgp-oid.c:212:0
- pointer overflow
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/dns-cert.c (get_dns_cert): Make r_key optional.
* common/pka.c: Rewrite for the new hash based lookup.
* common/t-pka.c: New.
* configure.ac: Remove option --disable-dns-pka.
(USE_DNS_PKA): Remove ac_define.
* g10/getkey.c (parse_auto_key_locate): Always include PKA.
--
Note that although PKA is now always build, it will only work if
support for looking up via DNS has not been disabled.
The new PKA only works with the IPGP DNS certtype and shall be used
only to retrieve the fingerprint and optional the key for the first
time. Due to the security problems with DNSSEC the former assumption
to validate the key using DNSSEC is not anymore justified. Instead an
additional layer (e.g. Trust-On-First-Use) needs to be implemented to
track change to the key. Having a solid way of getting a key matching
a mail address is however a must have.
More work needs to go into a redefinition of the --verify-options
pka-lookups and pka-trust-increase. The auto-key-locate mechanism
should also be able to continue key fetching with another methods once
the fingerprint has been retrieved with PKA.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/dns-cert.c (get_dns_cert): Add arg want_certtype. Change all
callers.
(CERTTYPE_): Move constants to ...
* common/dns-cert.h: here as DNS_CERTTYPE_.
Signed-off-by: Werner Koch <wk@gnupg.org>
* g10/mailbox.c: Move to ...
* common/mbox-util.c: new file.
* common/mbox-util.h: New. Include where needed.
* g10/t-mailbox.c: Move to ...
* common/t-mbox-util.c: new file.
--
This will make it easier to use the code by other modules in common/.
* common/host2net.h (buf16_to_ulong, buf16_to_uint): New.
(buf16_to_ushort, buf16_to_u16): New.
(buf32_to_size_t, buf32_to_ulong, buf32_to_uint, buf32_to_u32): New.
--
Commit 91b826a38880fd8a989318585eb502582636ddd8 was not enough to
avoid all sign extension on shift problems. Hanno Böck found a case
with an invalid read due to this problem. To fix that once and for
all almost all uses of "<< 24" and "<< 8" are changed by this patch to
use an inline function from host2net.h.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/homedir.c (get_default_pinentry_name): New.
(gnupg_module_name): Use that for the default pinentry.
(gnupg_module_name_flush_some): New.
* agent/gpg-agent.c (agent_sighup_action): Flush some module names.
* agent/call-pinentry.c (start_pinentry): Do not modify
opt.pinentry_program.
--
The idea with this change is that under Windows we can install a
simple native Windows pinentry as "pinentry-basic" and a full GUI
version may then later install pinentry-gtk etc which would then
automatically be used.
Unfortunately installing another pinentry from a different package
would clobber the GnuPG core directory which is not nice. To fix that
we would need to agree on standard installation directories for GUIs
to also look there.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/homedir.c (w32_rootdir): Use Unicode fucntion not only for
WinCE.
--
This uses the same code We used for WindowsCE. It has not been tested
with a Unicode requiring installation directory.
Signed-off-by: Werner Koch <wk@gnupg.org>
* g10/gpg.c (list_config): Replace print_sanitized_string2 by
es_write_sanitized.
* common/stringhelp.c (print_sanitized_buffer2): Remove.
(print_sanitized_buffer, print_sanitized_utf8_buffer): Remove.
(print_sanitized_utf8_buffer, print_sanitized_utf8_string): Remove.
(print_sanitized_string): Remove.
* sm/certdump.c (print_dn_part, print_dn_parts): Remove arg FP.
(pretty_print_sexp, gpgsm_print_name2, gpgsm_print_name): Remove.
--
Mixing stdio and estream is never a good idea. This fix also allows
us to remove a lot of garbage.
Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
GnuPG-bug-id: 1822
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/iobuf.c: (iobuf_open): initialize len
--
In iobuf_open, IOBUFCTRL_DESC and IOBUFCTRL_INIT commands are invoked
(via file_filter()) on fcx, passing in a pointer to an uninitialized
len.
With these two commands, file_filter doesn't actually do anything with
the value of len, so there's no actual risk of use of uninitialized
memory in the code as it stands.
However, some static analysis tools might flag this situation with a
warning, and initializing the value doesn't hurt anything, so i think
this trivial cleanup is warranted.
Debian-Bug-Id: 773469
* common/dotlock.c: (dotlock_create_unix) avoid double-close()
in unusual situations.
--
close(2) says:
close() should not be retried after an EINTR since this may
cause a reused descriptor from another thread to be closed.
Before this patch was applied, if close(fd) failed with EINTR, it
would be closed again in the write_failed: block.
It could also have been closed a second time in the case that
(use_hardlinks_p (h->tname)) evaluated to something other than 0 or 1.
This patch avoids both of those scenarios.
Note that close() could still be called twice on the same file
descriptor if the first close(fd) fails but errno is not EINTR. I'm
not sure the right thing to do in that scenario. An alternate
resolution could be to unequivocally set fd to -1 after the first
failed close(fd), avoiding the errno == EINTR test.
Debian-Bug-Id: 773423
* agent/command-ssh.c (setup_ssh_env): Move code to ...
* agent/gpg-agent.c (agent_copy_startup_env): .. new function. Change
calllers.
* agent/command.c (start_command_handler): Call that fucntion for
restricted connections.
--
A remote connection is and should not be able to setup the local
session environment. However, unless --keep-display is used we would
be left without an environment and thus pinentry can't be used. The
fix is the same as used for ssh-agent connection: We use the default
environment as used at the startup of the agent.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/util.h (GPG_ERR_OBJ_TERM_STATE): New.
* scd/iso7816.c (map_sw): Add this error code.
* scd/app-openpgp.c (do_getattr): Return the life cycle indicator.
* scd/app.c (select_application): Allow a return value of
GPG_ERR_OBJ_TERM_STATE.
* scd/scdaemon.c (set_debug): Print the DBG_READER value.
* g10/call-agent.c (start_agent): Print a status line for the
termination state.
(agent_scd_learn): Make arg "info" optional.
(agent_scd_apdu): New.
* g10/card-util.c (send_apdu): New.
(factory_reset): New.
(card_edit): Add command factory-reset.
Signed-off-by: Werner Koch <wk@gnupg.org>
* common/http.c (send_request): Print TLS alert info
(connect_server): Detect bogus DNS entry.
--
1. Prints the TLS alert description.
2. Detect case where the DNS returns an IP address but the server is
not reachable at this address. This may happen for a server which
is reachable only at IPv6 but but the local machine has no full
IPv6 configuration.
* agent/agent.h (opt): Add field extra_socket.
(server_control_s): Add field restricted.
* agent/command.c: Check restricted flag on many commands.
* agent/gpg-agent.c (oExtraSocket): New.
(opts): Add option --extra-socket.
(socket_name_extra): New.
(cleanup): Cleanup that socket name.
(main): Implement oExtraSocket.
(create_socket_name): Add arg homedir and change all callers.
(create_server_socket): Rename arg is_ssh to primary and change
callers.
(start_connection_thread): Take ctrl as arg.
(start_connection_thread_std): New.
(start_connection_thread_extra): New.
(handle_connections): Add arg listen_fd_extra and replace the
connection starting code by parameterized loop.
* common/asshelp.c (start_new_gpg_agent): Detect the use of the
restricted mode and don't fail on sending the pinentry environment.
* common/util.h (GPG_ERR_FORBIDDEN): New.
