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gnupg/common/asshelp.c

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/* asshelp.c - Helper functions for Assuan
* Copyright (C) 2002, 2004, 2007, 2009 Free Software Foundation, Inc.
*
* 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 <unistd.h>
#include <errno.h>
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#include "i18n.h"
#include "util.h"
#include "exechelp.h"
#include "sysutils.h"
#include "status.h"
#include "asshelp.h"
static gpg_error_t
send_one_option (assuan_context_t ctx, gpg_err_source_t errsource,
const char *name, const char *value, int use_putenv)
{
gpg_error_t err;
char *optstr;
(void)errsource;
if (!value || !*value)
err = 0; /* Avoid sending empty strings. */
else if (asprintf (&optstr, "OPTION %s%s=%s",
use_putenv? "putenv=":"", name, value) < 0)
err = gpg_error_from_syserror ();
else
{
err = assuan_transact (ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL);
xfree (optstr);
}
return err;
}
/* Send the assuan commands pertaining to the pinentry environment. The
OPT_* arguments are optional and may be used to override the
defaults taken from the current locale. */
gpg_error_t
send_pinentry_environment (assuan_context_t ctx,
gpg_err_source_t errsource,
const char *opt_lc_ctype,
const char *opt_lc_messages,
session_env_t session_env)
{
gpg_error_t err = 0;
char *old_lc = NULL;
char *dft_lc = NULL;
const char *dft_ttyname;
int iterator;
const char *name, *assname, *value;
int is_default;
iterator = 0;
while ((name = session_env_list_stdenvnames (&iterator, &assname)))
{
value = session_env_getenv_or_default (session_env, name, NULL);
if (!value)
continue;
if (assname)
err = send_one_option (ctx, errsource, assname, value, 0);
else
{
err = send_one_option (ctx, errsource, name, value, 1);
if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
err = 0; /* Server too old; can't pass the new envvars. */
}
if (err)
return err;
}
dft_ttyname = session_env_getenv_or_default (session_env, "GPG_TTY",
&is_default);
if (dft_ttyname && !is_default)
dft_ttyname = NULL; /* We need the default value. */
/* Send the value for LC_CTYPE. */
#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
old_lc = setlocale (LC_CTYPE, NULL);
if (old_lc)
{
old_lc = xtrystrdup (old_lc);
if (!old_lc)
return gpg_error_from_syserror ();
}
dft_lc = setlocale (LC_CTYPE, "");
#endif
if (opt_lc_ctype || (dft_ttyname && dft_lc))
{
err = send_one_option (ctx, errsource, "lc-ctype",
opt_lc_ctype ? opt_lc_ctype : dft_lc, 0);
}
#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
if (old_lc)
{
setlocale (LC_CTYPE, old_lc);
xfree (old_lc);
}
#endif
if (err)
return err;
/* Send the value for LC_MESSAGES. */
#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
old_lc = setlocale (LC_MESSAGES, NULL);
if (old_lc)
{
old_lc = xtrystrdup (old_lc);
if (!old_lc)
return gpg_error_from_syserror ();
}
dft_lc = setlocale (LC_MESSAGES, "");
#endif
if (opt_lc_messages || (dft_ttyname && dft_lc))
{
err = send_one_option (ctx, errsource, "lc-messages",
opt_lc_messages ? opt_lc_messages : dft_lc, 0);
}
#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
if (old_lc)
{
setlocale (LC_MESSAGES, old_lc);
xfree (old_lc);
}
#endif
if (err)
return err;
return 0;
}
/* Try to connect to the agent via socket or fork it off and work by
pipes. Handle the server's initial greeting. Returns a new assuan
context at R_CTX or an error code. */
gpg_error_t
start_new_gpg_agent (assuan_context_t *r_ctx,
gpg_err_source_t errsource,
const char *homedir,
const char *agent_program,
const char *opt_lc_ctype,
const char *opt_lc_messages,
session_env_t session_env,
int verbose, int debug,
gpg_error_t (*status_cb)(ctrl_t, int, ...),
ctrl_t status_cb_arg)
{
/* If we ever failed to connect via a socket we will force the use
of the pipe based server for the lifetime of the process. */
static int force_pipe_server = 0;
gpg_error_t rc = 0;
char *infostr, *p;
assuan_context_t ctx;
*r_ctx = NULL;
rc = assuan_new (&ctx);
if (rc)
{
log_error ("error allocating assuan context: %s\n", gpg_strerror (rc));
return rc;
}
restart:
infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
if (!infostr || !*infostr)
{
char *sockname;
/* First check whether we can connect at the standard
socket. */
sockname = make_filename (homedir, "S.gpg-agent", NULL);
rc = assuan_socket_connect (ctx, sockname, 0, 0);
if (rc)
{
/* With no success start a new server. */
if (verbose)
log_info (_("no running gpg-agent - starting one\n"));
if (status_cb)
status_cb (status_cb_arg, STATUS_PROGRESS,
"starting_agent ? 0 0", NULL);
if (fflush (NULL))
{
gpg_error_t tmperr = gpg_error (gpg_err_code_from_errno (errno));
log_error ("error flushing pending output: %s\n",
strerror (errno));
xfree (sockname);
assuan_release (ctx);
return tmperr;
}
if (!agent_program || !*agent_program)
agent_program = gnupg_module_name (GNUPG_MODULE_NAME_AGENT);
#ifdef HAVE_W32_SYSTEM
{
/* Under Windows we start the server in daemon mode. This
is because the default is to use the standard socket
and thus there is no need for the GPG_AGENT_INFO
envvar. This is possible as we don't have a real unix
domain socket but use a plain file and thus there is no
need to care about non-local file systems. */
const char *argv[3];
argv[0] = "--daemon";
argv[1] = "--use-standard-socket";
argv[2] = NULL;
rc = gnupg_spawn_process_detached (agent_program, argv, NULL);
if (rc)
log_debug ("failed to start agent `%s': %s\n",
agent_program, gpg_strerror (rc));
else
{
/* Give the agent some time to prepare itself. */
gnupg_sleep (3);
/* Now try again to connect the agent. */
rc = assuan_socket_connect (ctx, sockname, 0);
}
}
#else /*!HAVE_W32_SYSTEM*/
{
const char *pgmname;
const char *argv[3];
int no_close_list[3];
int i;
if ( !(pgmname = strrchr (agent_program, '/')))
pgmname = agent_program;
else
pgmname++;
argv[0] = pgmname;
argv[1] = "--server";
argv[2] = NULL;
i=0;
if (log_get_fd () != -1)
no_close_list[i++] = log_get_fd ();
no_close_list[i++] = fileno (stderr);
no_close_list[i] = -1;
/* Connect to the agent and perform initial handshaking. */
rc = assuan_pipe_connect (ctx, agent_program, argv,
no_close_list, NULL, NULL, 0);
}
#endif /*!HAVE_W32_SYSTEM*/
}
xfree (sockname);
}
else
{
int prot;
int pid;
infostr = xstrdup (infostr);
if ( !(p = strchr (infostr, PATHSEP_C)) || p == infostr)
{
log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
xfree (infostr);
force_pipe_server = 1;
goto restart;
}
*p++ = 0;
pid = atoi (p);
while (*p && *p != PATHSEP_C)
p++;
prot = *p? atoi (p+1) : 0;
if (prot != 1)
{
log_error (_("gpg-agent protocol version %d is not supported\n"),
prot);
xfree (infostr);
force_pipe_server = 1;
goto restart;
}
rc = assuan_socket_connect (ctx, infostr, pid, 0);
xfree (infostr);
if (gpg_err_code (rc) == GPG_ERR_ASS_CONNECT_FAILED)
{
log_info (_("can't connect to the agent - trying fall back\n"));
force_pipe_server = 1;
goto restart;
}
}
if (rc)
{
log_error ("can't connect to the agent: %s\n", gpg_strerror (rc));
assuan_release (ctx);
return gpg_error (GPG_ERR_NO_AGENT);
}
if (debug)
log_debug ("connection to agent established\n");
rc = assuan_transact (ctx, "RESET",
NULL, NULL, NULL, NULL, NULL, NULL);
if (!rc)
rc = send_pinentry_environment (ctx, errsource,
opt_lc_ctype, opt_lc_messages,
session_env);
if (rc)
{
assuan_release (ctx);
return rc;
}
*r_ctx = ctx;
return 0;
}
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