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f19ff78f0f
* common/asshelp2.c (vprint_assuan_status_strings): New. (print_assuan_status_strings): New. * agent/command.c (agent_write_status): Replace by call to new function. * dirmngr/server.c (dirmngr_status): Ditto. * g13/server.c (g13_status): Ditto. * g13/sh-cmd.c (g13_status): Ditto. * sm/server.c (gpgsm_status2): Ditto. * scd/command.c (send_status_info): Bump up N. -- This fixes a potential overflow if LFs are passed to the status string functions. This is actually not the case and would be wrong because neither the truncating in libassuan or our escaping is not the Right Thing. In any case the functions need to be more robust and comply to the promised interface. Thus the code has been factored out to a helper function and N has been bumped up correctly and checked in all cases. For some uses this changes the behaviour in the error case (i.e. CR or LF passed): It will now always be C-escaped and not passed to libassuan which would truncate the line at the first LF. Reported-by: private_pers
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/* asshelp2.c - More helper functions for Assuan
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* Copyright (C) 2012 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of either
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*
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* - the GNU Lesser General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* or
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*
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* - the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* or both in parallel, as here.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assuan.h>
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#include "util.h"
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#include "asshelp.h"
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/* Helper function to print an assuan status line using a printf
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format string. */
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gpg_error_t
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vprint_assuan_status (assuan_context_t ctx,
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const char *keyword,
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const char *format, va_list arg_ptr)
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{
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int rc;
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char *buf;
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rc = gpgrt_vasprintf (&buf, format, arg_ptr);
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if (rc < 0)
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return gpg_err_make (default_errsource, gpg_err_code_from_syserror ());
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rc = assuan_write_status (ctx, keyword, buf);
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xfree (buf);
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return rc;
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}
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/* Helper function to print an assuan status line using a printf
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format string. */
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gpg_error_t
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print_assuan_status (assuan_context_t ctx,
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const char *keyword,
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const char *format, ...)
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{
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va_list arg_ptr;
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gpg_error_t err;
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va_start (arg_ptr, format);
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err = vprint_assuan_status (ctx, keyword, format, arg_ptr);
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va_end (arg_ptr);
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return err;
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}
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/* Helper function to print a list of strings as an assuan status
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* line. KEYWORD is the first item on the status line. ARG_PTR is a
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* list of strings which are all separated by a space in the output.
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* The last argument must be a NULL. Linefeeds and carriage returns
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* characters (which are not allowed in an Assuan status line) are
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* silently quoted in C-style. */
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gpg_error_t
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vprint_assuan_status_strings (assuan_context_t ctx,
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const char *keyword, va_list arg_ptr)
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{
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gpg_error_t err = 0;
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const char *text;
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char buf[950], *p;
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size_t n;
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p = buf;
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n = 0;
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while ((text = va_arg (arg_ptr, const char *)) && n < DIM (buf)-3 )
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{
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if (n)
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{
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*p++ = ' ';
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n++;
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}
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for ( ; *text && n < DIM (buf)-3; n++, text++)
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{
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if (*text == '\n')
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{
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*p++ = '\\';
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*p++ = 'n';
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n++;
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}
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else if (*text == '\r')
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{
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*p++ = '\\';
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*p++ = 'r';
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n++;
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}
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else
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*p++ = *text;
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}
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}
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*p = 0;
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err = assuan_write_status (ctx, keyword, buf);
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return err;
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}
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/* See vprint_assuan_status_strings. */
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gpg_error_t
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print_assuan_status_strings (assuan_context_t ctx, const char *keyword, ...)
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{
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va_list arg_ptr;
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gpg_error_t err;
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va_start (arg_ptr, keyword);
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err = vprint_assuan_status_strings (ctx, keyword, arg_ptr);
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va_end (arg_ptr);
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return err;
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}
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