Approved by: roberto, delphij Security: VuXML: 0d0f3050-1f69-11e5-9ba9-d050996490d0 Security: http://bugs.ntp.org/show_bug.cgi?id=2853 Security: https://www.kb.cert.org/vuls/id/668167 Security: http://support.ntp.org/bin/view/Main/SecurityNotice#June_2015_NTP_Security_Vulnerabi
188 lines
4.9 KiB
C
188 lines
4.9 KiB
C
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/**
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* \file pgusage.c
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*
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* Automated Options Paged Usage module.
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*
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* @addtogroup autoopts
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* @{
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*/
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/*
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* This routine will run run-on options through a pager so the
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* user may examine, print or edit them at their leisure.
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*
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* This file is part of AutoOpts, a companion to AutoGen.
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* AutoOpts is free software.
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* AutoOpts is Copyright (C) 1992-2015 by Bruce Korb - all rights reserved
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*
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* AutoOpts is available under any one of two licenses. The license
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* in use must be one of these two and the choice is under the control
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* of the user of the license.
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*
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* The GNU Lesser General Public License, version 3 or later
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* See the files "COPYING.lgplv3" and "COPYING.gplv3"
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*
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* The Modified Berkeley Software Distribution License
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* See the file "COPYING.mbsd"
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*
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* These files have the following sha256 sums:
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*
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* 8584710e9b04216a394078dc156b781d0b47e1729104d666658aecef8ee32e95 COPYING.gplv3
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* 4379e7444a0e2ce2b12dd6f5a52a27a4d02d39d247901d3285c88cf0d37f477b COPYING.lgplv3
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* 13aa749a5b0a454917a944ed8fffc530b784f5ead522b1aacaf4ec8aa55a6239 COPYING.mbsd
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*/
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#if defined(HAVE_WORKING_FORK)
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static inline FILE *
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open_tmp_usage(char ** buf)
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{
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char * bf;
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size_t bfsz;
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{
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unsigned int my_pid = (unsigned int)getpid();
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char const * tmpdir = getenv(TMPDIR);
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if (tmpdir == NULL)
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tmpdir = tmp_dir;
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bfsz = TMP_FILE_FMT_LEN + strlen(tmpdir) + 10;
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bf = AGALOC(bfsz, "tmp fil");
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snprintf(bf, bfsz, TMP_FILE_FMT, tmpdir, my_pid);
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}
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{
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static mode_t const cmask = S_IRWXO | S_IRWXG;
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mode_t svmsk = umask(cmask);
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int fd = mkstemp(bf);
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(void)umask(svmsk);
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if (fd < 0) {
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AGFREE(bf);
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return NULL;
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}
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*buf = bf;
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return fdopen(fd, "w");
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}
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}
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static inline char *
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mk_pager_cmd(char const * fname)
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{
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/*
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* Page the file and remove it when done. For shell script processing,
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* we must redirect the output to the current stderr, otherwise stdout.
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*/
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fclose(option_usage_fp);
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option_usage_fp = NULL;
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{
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char const * pager = (char const *)getenv(PAGER_NAME);
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size_t bfsz;
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char * res;
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/*
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* Use the "more(1)" program if "PAGER" has not been defined
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*/
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if (pager == NULL)
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pager = MORE_STR;
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bfsz = 2 * strlen(fname) + strlen(pager) + PAGE_USAGE_FMT_LEN;
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res = AGALOC(bfsz, "more cmd");
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snprintf(res, bfsz, PAGE_USAGE_FMT, pager, fname);
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AGFREE(fname);
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return res;
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}
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}
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#endif
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/*=export_func optionPagedUsage
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* private:
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*
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* what: emit help text and pass through a pager program.
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* arg: + tOptions * + opts + program options descriptor +
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* arg: + tOptDesc * + od + the descriptor for this arg +
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*
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* doc:
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* Run the usage output through a pager.
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* This is very handy if it is very long.
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* This is disabled on platforms without a working fork() function.
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=*/
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void
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optionPagedUsage(tOptions * opts, tOptDesc * od)
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{
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#if ! defined(HAVE_WORKING_FORK)
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if ((od->fOptState & OPTST_RESET) != 0)
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return;
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(*opts->pUsageProc)(opts, EXIT_SUCCESS);
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#else
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static bool sv_print_exit = false;
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static char * fil_name = NULL;
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/*
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* IF we are being called after the usage proc is done
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* (and thus has called "exit(2)")
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* THEN invoke the pager to page through the usage file we created.
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*/
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switch (pagerState) {
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case PAGER_STATE_INITIAL:
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{
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if ((od->fOptState & OPTST_RESET) != 0)
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return;
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option_usage_fp = open_tmp_usage(&fil_name);
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if (option_usage_fp == NULL)
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(*opts->pUsageProc)(opts, EXIT_SUCCESS);
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pagerState = PAGER_STATE_READY;
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sv_print_exit = print_exit;
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/*
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* Set up so this routine gets called during the exit logic
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*/
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atexit((void(*)(void))optionPagedUsage);
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/*
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* The usage procedure will now put the usage information into
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* the temporary file we created above. Keep any shell commands
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* out of the result.
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*/
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print_exit = false;
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(*opts->pUsageProc)(opts, EXIT_SUCCESS);
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/* NOTREACHED */
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_exit(EXIT_FAILURE);
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}
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case PAGER_STATE_READY:
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fil_name = mk_pager_cmd(fil_name);
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if (sv_print_exit) {
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fputs("\nexit 0\n", stdout);
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fclose(stdout);
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dup2(STDERR_FILENO, STDOUT_FILENO);
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} else {
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fclose(stderr);
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dup2(STDOUT_FILENO, STDERR_FILENO);
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}
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ignore_val( system( fil_name));
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AGFREE(fil_name);
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case PAGER_STATE_CHILD:
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/*
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* This is a child process used in creating shell script usage.
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*/
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break;
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}
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#endif
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}
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/** @}
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*
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* Local Variables:
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* mode: C
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* c-file-style: "stroustrup"
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* indent-tabs-mode: nil
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* End:
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* end of autoopts/pgusage.c */
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