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/* version.c - Version check routines.
Copyright (C) 2000 Werner Koch (dd9jn)
Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH
This file is part of GPGME.
GPGME is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
GPGME 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02111-1307, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <limits.h>
#include <ctype.h>
#include "gpgme.h"
#include "priv-io.h"
/* For _gpgme_sema_subsystem_init (). */
#include "sema.h"
#ifdef HAVE_ASSUAN_H
#include "assuan.h"
#endif
/* Bootstrap the subsystems needed for concurrent operation. This
must be done once at startup. We can not guarantee this using a
lock, though, because the semaphore subsystem needs to be
initialized itself before it can be used. So we expect that the
user performs the necessary syncrhonization. */
static void
do_subsystem_inits (void)
{
static int done = 0;
if (done)
return;
_gpgme_sema_subsystem_init ();
_gpgme_io_subsystem_init ();
#ifdef HAVE_ASSUAN_H
assuan_set_assuan_err_source (GPG_ERR_SOURCE_GPGME);
#endif
done = 1;
}
/* Read the next number in the version string STR and return it in
*NUMBER. Return a pointer to the tail of STR after parsing, or
*NULL if the version string was invalid. */
static const char *
parse_version_number (const char *str, int *number)
{
#define MAXVAL ((INT_MAX - 10) / 10)
int val = 0;
/* Leading zeros are not allowed. */
if (*str == '0' && isdigit(str[1]))
return NULL;
while (isdigit (*str) && val <= MAXVAL)
{
val *= 10;
val += *(str++) - '0';
}
*number = val;
return val > MAXVAL ? NULL : str;
}
/* Parse the version string STR in the format MAJOR.MINOR.MICRO (for
example, 9.3.2) and return the components in MAJOR, MINOR and MICRO
as integers. The function returns the tail of the string that
follows the version number. This might be te empty string if there
is nothing following the version number, or a patchlevel. The
function returns NULL if the version string is not valid. */
static const char *
parse_version_string (const char *str, int *major, int *minor, int *micro)
{
str = parse_version_number (str, major);
if (!str || *str != '.')
return NULL;
str++;
str = parse_version_number (str, minor);
if (!str || *str != '.')
return NULL;
str++;
str = parse_version_number (str, micro);
if (!str)
return NULL;
/* A patchlevel might follow. */
return str;
}
/* Return true if MY_VERSION is at least REQ_VERSION, and false
otherwise. */
int
_gpgme_compare_versions (const char *my_version,
const char *rq_version)
{
int my_major, my_minor, my_micro;
int rq_major, rq_minor, rq_micro;
const char *my_plvl, *rq_plvl;
if (!rq_version)
return 1;
if (!my_version)
return 0;
my_plvl = parse_version_string (my_version, &my_major, &my_minor, &my_micro);
if (!my_plvl)
return 0;
rq_plvl = parse_version_string (rq_version, &rq_major, &rq_minor, &rq_micro);
if (!rq_plvl)
return 0;
if (my_major > rq_major
|| (my_major == rq_major && my_minor > rq_minor)
|| (my_major == rq_major && my_minor == rq_minor
&& my_micro > rq_micro)
|| (my_major == rq_major && my_minor == rq_minor
&& my_micro == rq_micro && strcmp (my_plvl, rq_plvl) >= 0))
return 1;
return 0;
}
/* Check that the the version of the library is at minimum the
requested one and return the version string; return NULL if the
condition is not met. If a NULL is passed to this function, no
check is done and the version string is simply returned.
This function must be run once at startup, as it also initializes
some subsystems. Its invocation must be synchronized against
calling any of the other functions in a multi-threaded
environments. */
const char *
gpgme_check_version (const char *req_version)
{
do_subsystem_inits ();
return _gpgme_compare_versions (VERSION, req_version) ? VERSION : NULL;
}
#define LINELENGTH 80
/* Retrieve the version number from the --version output of the
program FILE_NAME. */
char *
_gpgme_get_program_version (const char *const file_name)
{
char line[LINELENGTH] = "";
int linelen = 0;
char *mark = NULL;
int rp[2];
int nread;
char *argv[] = {NULL /* file_name */, "--version", 0};
struct spawn_fd_item_s pfd[] = { {0, -1}, {-1, -1} };
struct spawn_fd_item_s cfd[] = { {-1, 1 /* STDOUT_FILENO */}, {-1, -1} };
int status;
if (!file_name)
return NULL;
argv[0] = (char *) file_name;
if (_gpgme_io_pipe (rp, 1) < 0)
return NULL;
pfd[0].fd = rp[1];
cfd[0].fd = rp[1];
status = _gpgme_io_spawn (file_name, argv, cfd, pfd);
if (status < 0)
{
_gpgme_io_close (rp[0]);
_gpgme_io_close (rp[1]);
return NULL;
}
do
{
nread = _gpgme_io_read (rp[0], &line[linelen], LINELENGTH - linelen - 1);
if (nread > 0)
{
line[linelen + nread] = '\0';
mark = strchr (&line[linelen], '\n');
if (mark)
{
if (mark > &line[0] && *mark == '\r')
mark--;
*mark = '\0';
break;
}
linelen += nread;
}
}
while (nread > 0 && linelen < LINELENGTH - 1);
_gpgme_io_close (rp[0]);
if (mark)
{
mark = strrchr (line, ' ');
if (!mark)
return NULL;
return strdup (mark + 1);
}
return NULL;
}
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