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Diffstat (limited to 'src/version.c')
| -rw-r--r-- | src/version.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/src/version.c b/src/version.c new file mode 100644 index 00000000..dd23ccfc --- /dev/null +++ b/src/version.c @@ -0,0 +1,309 @@ +/* version.c - Version check routines. + Copyright (C) 2000 Werner Koch (dd9jn) + Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2008 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., 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#if HAVE_CONFIG_H +#include <config.h> +#endif +#include <string.h> +#include <limits.h> +#include <ctype.h> +#ifdef HAVE_W32_SYSTEM +#include <winsock2.h> +#endif + +#include "gpgme.h" +#include "priv-io.h" +#include "debug.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 synchronization. */ +static void +do_subsystem_inits (void) +{ + static int done = 0; + + if (done) + return; + + _gpgme_sema_subsystem_init (); +#ifdef HAVE_ASSUAN_H + assuan_set_assuan_log_level (0); + assuan_set_assuan_err_source (GPG_ERR_SOURCE_GPGME); +#endif /*HAVE_ASSUAN_H*/ + _gpgme_debug_subsystem_init (); +#if defined(HAVE_W32_SYSTEM) && defined(HAVE_ASSUAN_H) + _gpgme_io_subsystem_init (); + /* We need to make sure that the sockets are initialized. */ + { + WSADATA wsadat; + + WSAStartup (0x202, &wsadat); + } +#endif /*HAVE_W32_SYSTEM && HAVE_ASSUAN_H*/ + + 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 (); + + /* Catch-22: We need to get at least the debug subsystem ready + before using the tarce facility. If we won't the tarce would + automagically initialize the debug system with out the locks + being initialized and missing the assuan log level setting. */ + TRACE2 (DEBUG_INIT, "gpgme_check_version: ", 0, + "req_version=%s, VERSION=%s", req_version, VERSION); + + return _gpgme_compare_versions (VERSION, req_version) ? VERSION : NULL; +} + + +#define LINELENGTH 80 + +/* Extract the version string of a program from STRING. The version + number is expected to be in GNU style format: + + foo 1.2.3 + foo (bar system) 1.2.3 + foo 1.2.3 cruft + foo (bar system) 1.2.3 cruft. + + Spaces and tabs are skipped and used as delimiters, a term in + (nested) parenthesis before the version string is skipped, the + version string may consist of any non-space and non-tab characters + but needs to bstart with a digit. +*/ +static const char * +extract_version_string (const char *string, size_t *r_len) +{ + const char *s; + int count, len; + + for (s=string; *s; s++) + if (*s == ' ' || *s == '\t') + break; + while (*s == ' ' || *s == '\t') + s++; + if (*s == '(') + { + for (count=1, s++; count && *s; s++) + if (*s == '(') + count++; + else if (*s == ')') + count--; + } + /* For robustness we look for a digit. */ + while ( *s && !(*s >= '0' && *s <= '9') ) + s++; + if (*s >= '0' && *s <= '9') + { + for (len=0; s[len]; len++) + if (s[len] == ' ' || s[len] == '\t') + break; + } + else + len = 0; + + *r_len = len; + return s; +} + + +/* 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 cfd[] = { {-1, 1 /* STDOUT_FILENO */, -1, 0}, + {-1, -1} }; + int status; + + if (!file_name) + return NULL; + argv[0] = (char *) file_name; + + if (_gpgme_io_pipe (rp, 1) < 0) + return NULL; + + cfd[0].fd = rp[1]; + + status = _gpgme_io_spawn (file_name, argv, cfd, NULL); + 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) + { + size_t len; + const char *s; + + s = extract_version_string (line, &len); + if (!len) + return NULL; + mark = malloc (len + 1); + if (!mark) + return NULL; + memcpy (mark, s, len); + mark[len] = 0; + return mark; + } + + return NULL; +} |