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gnupg/tools/gpg-connect-agent.c

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/* gpg-connect-agent.c - Tool to connect to the agent.
* Copyright (C) 2005 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <assuan.h>
#include "i18n.h"
#include "../common/util.h"
#include "../common/asshelp.h"
/* Constants to identify the commands and options. */
enum cmd_and_opt_values
{
aNull = 0,
oQuiet = 'q',
oVerbose = 'v',
oRawSocket = 'S',
oExec = 'E',
oNoVerbose = 500,
oHomedir,
oHex,
oNoExtConnect
};
/* The list of commands and options. */
static ARGPARSE_OPTS opts[] =
{
{ 301, NULL, 0, N_("@\nOptions:\n ") },
{ oVerbose, "verbose", 0, N_("verbose") },
{ oQuiet, "quiet", 0, N_("quiet") },
{ oHex, "hex", 0, N_("print data out hex encoded") },
{ oRawSocket, "raw-socket", 2, N_("|NAME|connect to Assuan socket NAME")},
{ oExec, "exec", 0, N_("run the Assuan server given on the command line")},
{ oNoExtConnect, "no-ext-connect",
0, N_("do not use extended connect mode")},
/* hidden options */
{ oNoVerbose, "no-verbose", 0, "@"},
{ oHomedir, "homedir", 2, "@" },
{0}
};
/* We keep all global options in the structure OPT. */
struct
{
int verbose; /* Verbosity level. */
int quiet; /* Be extra quiet. */
const char *homedir; /* Configuration directory name */
int hex; /* Print data lines in hex format. */
const char *raw_socket; /* Name of socket to connect in raw mode. */
int exec; /* Run the pgm given on the command line. */
unsigned int connect_flags; /* Flags used for connecting. */
} opt;
/* Definitions for /definq commands and a global linked list with all
the definitions. */
struct definq_s
{
struct definq_s *next;
char *name; /* Name of inquiry or NULL for any name. */
int is_prog; /* True if this is a program to run. */
char file[1]; /* Name of file or program. */
};
typedef struct definq_s *definq_t;
static definq_t definq_list;
static definq_t *definq_list_tail = &definq_list;
/*-- local prototypes --*/
static int read_and_print_response (assuan_context_t ctx);
static assuan_context_t start_agent (void);
/* Print usage information and and provide strings for help. */
static const char *
my_strusage( int level )
{
const char *p;
switch (level)
{
case 11: p = "gpg-connect-agent (GnuPG)";
break;
case 13: p = VERSION; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = _("Please report bugs to <" PACKAGE_BUGREPORT ">.\n");
break;
case 1:
case 40: p = _("Usage: gpg-connect-agent [options] (-h for help)");
break;
case 41:
p = _("Syntax: gpg-connect-agent [options]\n"
"Connect to a running agent and send commands\n");
break;
case 31: p = "\nHome: "; break;
case 32: p = opt.homedir; break;
case 33: p = "\n"; break;
default: p = NULL; break;
}
return p;
}
/* Initialize the gettext system. */
static void
i18n_init(void)
{
#ifdef USE_SIMPLE_GETTEXT
set_gettext_file (PACKAGE_GT);
#else
# ifdef ENABLE_NLS
setlocale (LC_ALL, "" );
bindtextdomain (PACKAGE_GT, LOCALEDIR);
textdomain (PACKAGE_GT);
# endif
#endif
}
/* Store an inquire response pattern. Note, that this function may
change the content of LINE. We assume that leading white spaces
are already removed. */
static void
add_definq (char *line, int is_prog)
{
definq_t d;
char *name, *p;
/* Get name. */
name = line;
for (p=name; *p && !spacep (p); p++)
;
if (*p)
*p++ = 0;
while (spacep (p))
p++;
d = xmalloc (sizeof *d + strlen (p) );
strcpy (d->file, p);
d->is_prog = is_prog;
if ( !strcmp (name, "*"))
d->name = NULL;
else
d->name = xstrdup (name);
d->next = NULL;
*definq_list_tail = d;
definq_list_tail = &d->next;
}
/* Show all inquiry defintions. */
static void
show_definq (void)
{
definq_t d;
for (d=definq_list; d; d = d->next)
if (d->name)
printf ("%-20s %c %s\n", d->name, d->is_prog? 'p':'f', d->file);
for (d=definq_list; d; d = d->next)
if (!d->name)
printf ("%-20s %c %s\n", "*", d->is_prog? 'p':'f', d->file);
}
/* Clear all inquiry definitions. */
static void
clear_definq (void)
{
while (definq_list)
{
definq_t tmp = definq_list->next;
xfree (definq_list->name);
xfree (definq_list);
definq_list = tmp;
}
definq_list_tail = &definq_list;
}
static void
do_sendfd (assuan_context_t ctx, char *line)
{
FILE *fp;
char *name, *mode, *p;
int rc, fd;
/* Get file name. */
name = line;
for (p=name; *p && !spacep (p); p++)
;
if (*p)
*p++ = 0;
while (spacep (p))
p++;
/* Get mode. */
mode = p;
if (!*mode)
mode = "r";
else
{
for (p=mode; *p && !spacep (p); p++)
;
if (*p)
*p++ = 0;
}
/* Open and send. */
fp = fopen (name, mode);
if (!fp)
{
log_error ("can't open `%s' in \"%s\" mode: %s\n",
name, mode, strerror (errno));
return;
}
fd = fileno (fp);
if (opt.verbose)
log_error ("file `%s' opened in \"%s\" mode, fd=%d\n",
name, mode, fd);
rc = assuan_sendfd (ctx, fd);
if (rc)
log_error ("sednig descriptor %d failed: %s\n", fd, gpg_strerror (rc));
fclose (fp);
}
static void
do_recvfd (assuan_context_t ctx, char *line)
{
log_info ("This command has not yet been implemented\n");
}
/* gpg-connect-agent's entry point. */
int
main (int argc, char **argv)
{
ARGPARSE_ARGS pargs;
int no_more_options = 0;
assuan_context_t ctx;
char *line, *p;
size_t linesize;
int rc;
set_strusage (my_strusage);
log_set_prefix ("gpg-connect-agent", 1);
assuan_set_assuan_err_source (0);
i18n_init();
opt.homedir = default_homedir ();
opt.connect_flags = 1; /* Use extended connect mode. */
/* Parse the command line. */
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags = 1; /* Do not remove the args. */
while (!no_more_options && optfile_parse (NULL, NULL, NULL, &pargs, opts))
{
switch (pargs.r_opt)
{
case oQuiet: opt.quiet = 1; break;
case oVerbose: opt.verbose++; break;
case oNoVerbose: opt.verbose = 0; break;
case oHomedir: opt.homedir = pargs.r.ret_str; break;
case oHex: opt.hex = 1; break;
case oRawSocket: opt.raw_socket = pargs.r.ret_str; break;
case oExec: opt.exec = 1; break;
case oNoExtConnect: opt.connect_flags &= ~(1); break;
default: pargs.err = 2; break;
}
}
if (log_get_errorcount (0))
exit (2);
if (opt.exec)
{
if (!argc)
{
log_error (_("option \"%s\" requires a program "
"and optional arguments\n"), "--exec" );
exit (1);
}
}
else if (argc)
usage (1);
if (opt.exec && opt.raw_socket)
log_info (_("option \"%s\" ignored due to \"%s\"\n"),
"--raw-socket", "--exec");
if (opt.exec)
{
int no_close[3];
no_close[0] = fileno (stderr);
no_close[1] = log_get_fd ();
no_close[2] = -1;
rc = assuan_pipe_connect_ext (&ctx, *argv, (const char **)argv,
no_close, NULL, NULL,
opt.connect_flags);
if (rc)
{
log_error ("assuan_pipe_connect_ext failed: %s\n",
gpg_strerror (rc));
exit (1);
}
if (opt.verbose)
log_info ("server `%s' started\n", *argv);
}
else if (opt.raw_socket)
{
rc = assuan_socket_connect_ext (&ctx, opt.raw_socket, 0,
opt.connect_flags);
if (rc)
{
log_error ("can't connect to socket `%s': %s\n",
opt.raw_socket, gpg_strerror (rc));
exit (1);
}
if (opt.verbose)
log_info ("connection to socket `%s' established\n", opt.raw_socket);
}
else
ctx = start_agent ();
line = NULL;
linesize = 0;
for (;;)
{
int n;
size_t maxlength;
maxlength = 2048;
n = read_line (stdin, &line, &linesize, &maxlength);
if (n < 0)
{
log_error (_("error reading input: %s\n"), strerror (errno));
exit (1);
}
if (!n)
break; /* EOF */
if (!maxlength)
{
log_error (_("line too long - skipped\n"));
continue;
}
if (memchr (line, 0, n))
log_info (_("line shortened due to embedded Nul character\n"));
if (line[n-1] == '\n')
line[n-1] = 0;
if (*line == '/')
{
/* Handle control commands. */
char *cmd = line+1;
for (p=cmd; *p && !spacep (p); p++)
;
if (*p)
*p++ = 0;
while (spacep (p))
p++;
if (!strcmp (cmd, "definqfile"))
{
add_definq (p, 0);
}
else if (!strcmp (cmd, "definqprog"))
{
add_definq (p, 1);
}
else if (!strcmp (cmd, "showdef"))
{
show_definq ();
}
else if (!strcmp (cmd, "cleardef"))
{
clear_definq ();
}
else if (!strcmp (cmd, "echo"))
{
puts (p);
}
else if (!strcmp (cmd, "sendfd"))
{
do_sendfd (ctx, p);
continue;
}
else if (!strcmp (cmd, "recvfd"))
{
do_recvfd (ctx, p);
continue;
}
else if (!strcmp (cmd, "help"))
{
puts (
"Available commands:\n"
"/echo ARGS Echo ARGS.\n"
"/definqfile NAME FILE\n"
" Use content of FILE for inquiries with NAME.\n"
" NAME may be \"*\" to match any inquiry.\n"
"/definqprog NAME PGM\n"
" Run PGM for inquiries matching NAME and pass the\n"
" entire line to it as arguments.\n"
"/showdef Print all definitions.\n"
"/cleardef Delete all definitions.\n"
"/sendfd FILE MODE Open FILE and pass descripor to server.\n"
"/recvfd Receive FD from server and print. \n"
"/help Print this help.");
}
else
log_error (_("unknown command `%s'\n"), cmd );
continue;
}
rc = assuan_write_line (ctx, line);
if (rc)
{
log_info (_("sending line failed: %s\n"), gpg_strerror (rc) );
continue;
}
if (*line == '#' || !*line)
continue; /* Don't expect a response for a comment line. */
rc = read_and_print_response (ctx);
if (rc)
log_info (_("receiving line failed: %s\n"), gpg_strerror (rc) );
}
if (opt.verbose)
log_info ("closing connection to agent\n");
return 0;
}
/* Handle an Inquire from the server. Return False if it could not be
handled; in this case the caller shll complete the operation. LINE
is the complete line as received from the server. This function
may change the content of LINE. */
static int
handle_inquire (assuan_context_t ctx, char *line)
{
const char *name;
definq_t d;
FILE *fp;
char buffer[1024];
int rc, n;
/* Skip the command and trailing spaces. */
for (; *line && !spacep (line); line++)
;
while (spacep (line))
line++;
/* Get the name. */
name = line;
for (; *line && !spacep (line); line++)
;
if (*line)
*line++ = 0;
/* Now match it against our list. he second loop is todetect the
match all entry. **/
for (d=definq_list; d; d = d->next)
if (d->name && !strcmp (d->name, name))
break;
if (!d)
for (d=definq_list; d; d = d->next)
if (!d->name)
break;
if (!d)
{
if (opt.verbose)
log_info ("no handler for inquiry `%s' found\n", name);
return 0;
}
if (d->is_prog)
{
fp = popen (d->file, "r");
if (!fp)
log_error ("error executing `%s': %s\n", d->file, strerror (errno));
else if (opt.verbose)
log_error ("handling inquiry `%s' by running `%s'\n", name, d->file);
}
else
{
fp = fopen (d->file, "rb");
if (!fp)
log_error ("error opening `%s': %s\n", d->file, strerror (errno));
else if (opt.verbose)
log_error ("handling inquiry `%s' by returning content of `%s'\n",
name, d->file);
}
if (!fp)
return 0;
while ( (n = fread (buffer, 1, sizeof buffer, fp)) )
{
rc = assuan_send_data (ctx, buffer, n);
if (rc)
{
log_error ("sending data back failed: %s\n", gpg_strerror (rc) );
break;
}
}
if (ferror (fp))
log_error ("error reading from `%s': %s\n", d->file, strerror (errno));
rc = assuan_send_data (ctx, NULL, 0);
if (rc)
log_error ("sending data back failed: %s\n", gpg_strerror (rc) );
if (d->is_prog)
{
if (pclose (fp))
log_error ("error running `%s': %s\n", d->file, strerror (errno));
}
else
fclose (fp);
return 1;
}
/* Read all response lines from server and print them. Returns 0 on
success or an assuan error code. */
static int
read_and_print_response (assuan_context_t ctx)
{
char *line;
size_t linelen;
assuan_error_t rc;
int i, j;
for (;;)
{
do
{
rc = assuan_read_line (ctx, &line, &linelen);
if (rc)
return rc;
if (opt.verbose > 1 && *line == '#')
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
}
}
while (*line == '#' || !linelen);
if (linelen >= 1
&& line[0] == 'D' && line[1] == ' ')
{
if (opt.hex)
{
for (i=2; i < linelen; )
{
int save_i = i;
printf ("D[%04X] ", i-2);
for (j=0; j < 16 ; j++, i++)
{
if (j == 8)
putchar (' ');
if (i < linelen)
printf (" %02X", ((unsigned char*)line)[i]);
else
fputs (" ", stdout);
}
fputs (" ", stdout);
i= save_i;
for (j=0; j < 16; j++, i++)
{
unsigned int c = ((unsigned char*)line)[i];
if ( i >= linelen )
putchar (' ');
else if (isascii (c) && isprint (c) && !iscntrl (c))
putchar (c);
else
putchar ('.');
}
putchar ('\n');
}
}
else
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
}
}
else if (linelen >= 1
&& line[0] == 'S'
&& (line[1] == '\0' || line[1] == ' '))
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
}
else if (linelen >= 2
&& line[0] == 'O' && line[1] == 'K'
&& (line[2] == '\0' || line[2] == ' '))
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
return 0;
}
else if (linelen >= 3
&& line[0] == 'E' && line[1] == 'R' && line[2] == 'R'
&& (line[3] == '\0' || line[3] == ' '))
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
return 0;
}
else if (linelen >= 7
&& line[0] == 'I' && line[1] == 'N' && line[2] == 'Q'
&& line[3] == 'U' && line[4] == 'I' && line[5] == 'R'
&& line[6] == 'E'
&& (line[7] == '\0' || line[7] == ' '))
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
if (!handle_inquire (ctx, line))
assuan_write_line (ctx, "CANCEL");
}
else if (linelen >= 3
&& line[0] == 'E' && line[1] == 'N' && line[2] == 'D'
&& (line[3] == '\0' || line[3] == ' '))
{
fwrite (line, linelen, 1, stdout);
putchar ('\n');
/* Received from server, thus more responses are expected. */
}
else
return gpg_error (GPG_ERR_ASS_INV_RESPONSE);
}
}
/* Connect to the agent and send the standard options. */
static assuan_context_t
start_agent (void)
{
int rc = 0;
char *infostr, *p;
assuan_context_t ctx;
infostr = getenv ("GPG_AGENT_INFO");
if (!infostr || !*infostr)
{
char *sockname;
/* Check whether we can connect at the standard socket. */
sockname = make_filename (opt.homedir, "S.gpg-agent", NULL);
rc = assuan_socket_connect (&ctx, sockname, 0);
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);
exit (1);
}
*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);
exit (1);
}
rc = assuan_socket_connect (&ctx, infostr, pid);
xfree (infostr);
}
if (rc)
{
log_error ("can't connect to the agent: %s\n", gpg_strerror (rc));
exit (1);
}
if (opt.verbose)
log_info ("connection to agent established\n");
rc = assuan_transact (ctx, "RESET", NULL, NULL, NULL, NULL, NULL, NULL);
if (rc)
{
log_error (_("error sending %s command: %s\n"), "RESET",
gpg_strerror (rc));
exit (1);
}
rc = send_pinentry_environment (ctx, GPG_ERR_SOURCE_DEFAULT,
NULL, NULL, NULL, NULL, NULL);
if (rc)
{
log_error (_("error sending standard options: %s\n"), gpg_strerror (rc));
exit (1);
}
return ctx;
}
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