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gnupg/dirmngr/ks-action.c
Werner Koch fb56a273b1 dirmngr: Detect dead keyservers and try another one. 
* dirmngr/ks-action.c (ks_action_resolve): Rename var for clarity.
(ks_action_search, ks_action_put): Ditto.
(ks_action_get): Consult only the first server which retruned some
data.

* dirmngr/ks-engine-hkp.c (SEND_REQUEST_RETRIES): New.
(map_host): Add arg CTRL and call dirmngr_tick.
(make_host_part): Add arg CTRL.
(mark_host_dead): Allow the use of an URL.
(handle_send_request_error): New.
(ks_hkp_search, ks_hkp_get, ks_hkp_put): Mark host dead and retry on
error.
2014-03-12 14:33:51 +01:00

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/* ks-action.c - OpenPGP keyserver actions
* Copyright (C) 2011 Free Software Foundation, Inc.
* Copyright (C) 2011, 2014 Werner Koch
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "dirmngr.h"
#include "misc.h"
#include "ks-engine.h"
#include "ks-action.h"
/* Copy all data from IN to OUT. */
static gpg_error_t
copy_stream (estream_t in, estream_t out)
{
char buffer[512];
size_t nread;
while (!es_read (in, buffer, sizeof buffer, &nread))
{
if (!nread)
return 0; /* EOF */
if (es_write (out, buffer, nread, NULL))
break;
}
return gpg_error_from_syserror ();
}
/* Called by the engine's help functions to print the actual help. */
gpg_error_t
ks_print_help (ctrl_t ctrl, const char *text)
{
return dirmngr_status_help (ctrl, text);
}
/* Called by the engine's help functions to print the actual help. */
gpg_error_t
ks_printf_help (ctrl_t ctrl, const char *format, ...)
{
va_list arg_ptr;
gpg_error_t err;
char *buf;
va_start (arg_ptr, format);
buf = es_vasprintf (format, arg_ptr);
err = buf? 0 : gpg_error_from_syserror ();
va_end (arg_ptr);
if (!err)
err = dirmngr_status_help (ctrl, buf);
es_free (buf);
return err;
}
/* Run the help command for the engine responsible for URI. */
gpg_error_t
ks_action_help (ctrl_t ctrl, const char *url)
{
gpg_error_t err;
parsed_uri_t parsed_uri; /* The broken down URI. */
if (!url || !*url)
{
ks_print_help (ctrl, "Known schemata:\n");
parsed_uri = NULL;
}
else
{
err = http_parse_uri (&parsed_uri, url, 1);
if (err)
return err;
}
/* Call all engines to give them a chance to print a help sting. */
err = ks_hkp_help (ctrl, parsed_uri);
if (!err)
err = ks_http_help (ctrl, parsed_uri);
if (!err)
err = ks_finger_help (ctrl, parsed_uri);
if (!err)
err = ks_kdns_help (ctrl, parsed_uri);
if (!parsed_uri)
ks_print_help (ctrl,
"(Use an URL for engine specific help.)");
else
http_release_parsed_uri (parsed_uri);
return err;
}
/* Resolve all host names. This is useful for looking at the status
of configured keyservers. */
gpg_error_t
ks_action_resolve (ctrl_t ctrl)
{
gpg_error_t err = 0;
int any_server = 0;
uri_item_t uri;
for (uri = ctrl->keyservers; !err && uri; uri = uri->next)
{
if (uri->parsed_uri->is_http)
{
any_server = 1;
err = ks_hkp_resolve (ctrl, uri->parsed_uri);
if (err)
break;
}
}
if (!any_server)
err = gpg_error (GPG_ERR_NO_KEYSERVER);
return err;
}
/* Search all configured keyservers for keys matching PATTERNS and
write the result to the provided output stream. */
gpg_error_t
ks_action_search (ctrl_t ctrl, strlist_t patterns, estream_t outfp)
{
gpg_error_t err = 0;
int any_server = 0;
uri_item_t uri;
estream_t infp;
if (!patterns)
return gpg_error (GPG_ERR_NO_USER_ID);
/* FIXME: We only take care of the first pattern. To fully support
multiple patterns we might either want to run several queries in
parallel and merge them. We also need to decide what to do with
errors - it might not be the best idea to ignore an error from
one server and silently continue with another server. For now we
stop at the first error. */
for (uri = ctrl->keyservers; !err && uri; uri = uri->next)
{
if (uri->parsed_uri->is_http)
{
any_server = 1;
err = ks_hkp_search (ctrl, uri->parsed_uri, patterns->d, &infp);
if (!err)
{
err = copy_stream (infp, outfp);
es_fclose (infp);
break;
}
}
}
if (!any_server)
err = gpg_error (GPG_ERR_NO_KEYSERVER);
return err;
}
/* Get the requested keys (matching PATTERNS) using all configured
keyservers and write the result to the provided output stream. */
gpg_error_t
ks_action_get (ctrl_t ctrl, strlist_t patterns, estream_t outfp)
{
gpg_error_t err = 0;
gpg_error_t first_err = 0;
int any_server = 0;
int any_data = 0;
strlist_t sl;
uri_item_t uri;
estream_t infp;
if (!patterns)
return gpg_error (GPG_ERR_NO_USER_ID);
/* FIXME: We only take care of the first keyserver. To fully
support multiple keyservers we need to track the result for each
pattern and use the next keyserver if one key was not found. The
keyservers might not all be fully synced thus it is not clear
whether the first keyserver has the freshest copy of the key.
Need to think about a better strategy. */
for (uri = ctrl->keyservers; !err && uri; uri = uri->next)
{
if (uri->parsed_uri->is_http)
{
any_server = 1;
for (sl = patterns; !err && sl; sl = sl->next)
{
err = ks_hkp_get (ctrl, uri->parsed_uri, sl->d, &infp);
if (err)
{
/* It is possible that a server does not carry a
key, thus we only save the error and continue
with the next pattern. FIXME: It is an open
question how to return such an error condition to
the caller. */
first_err = err;
err = 0;
}
else
{
err = copy_stream (infp, outfp);
/* Reading from the keyserver should never fail, thus
return this error. */
if (!err)
any_data = 1;
es_fclose (infp);
infp = NULL;
}
}
}
if (any_data)
break; /* Stop loop after a keyserver returned something. */
}
if (!any_server)
err = gpg_error (GPG_ERR_NO_KEYSERVER);
else if (!err && first_err && !any_data)
err = first_err;
return err;
}
/* Retrieve keys from URL and write the result to the provided output
stream OUTFP. */
gpg_error_t
ks_action_fetch (ctrl_t ctrl, const char *url, estream_t outfp)
{
gpg_error_t err = 0;
estream_t infp;
parsed_uri_t parsed_uri; /* The broken down URI. */
if (!url)
return gpg_error (GPG_ERR_INV_URI);
err = http_parse_uri (&parsed_uri, url, 1);
if (err)
return err;
if (parsed_uri->is_http)
{
err = ks_http_fetch (ctrl, url, &infp);
if (!err)
{
err = copy_stream (infp, outfp);
es_fclose (infp);
}
}
else if (!parsed_uri->opaque)
{
err = gpg_error (GPG_ERR_INV_URI);
}
else if (!strcmp (parsed_uri->scheme, "finger"))
{
err = ks_finger_fetch (ctrl, parsed_uri, &infp);
if (!err)
{
err = copy_stream (infp, outfp);
es_fclose (infp);
}
}
else if (!strcmp (parsed_uri->scheme, "kdns"))
{
err = ks_kdns_fetch (ctrl, parsed_uri, &infp);
if (!err)
{
err = copy_stream (infp, outfp);
es_fclose (infp);
}
}
else
err = gpg_error (GPG_ERR_INV_URI);
http_release_parsed_uri (parsed_uri);
return err;
}
/* Send an OpenPGP key to all keyservers. The key in {DATA,DATALEN}
is expected in OpenPGP binary transport format. */
gpg_error_t
ks_action_put (ctrl_t ctrl, const void *data, size_t datalen)
{
gpg_error_t err = 0;
gpg_error_t first_err = 0;
int any_server = 0;
uri_item_t uri;
for (uri = ctrl->keyservers; !err && uri; uri = uri->next)
{
if (uri->parsed_uri->is_http)
{
any_server = 1;
err = ks_hkp_put (ctrl, uri->parsed_uri, data, datalen);
if (err)
{
first_err = err;
err = 0;
}
}
}
if (!any_server)
err = gpg_error (GPG_ERR_NO_KEYSERVER);
else if (!err && first_err)
err = first_err;
return err;
}
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