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/*
* Copyright (C) 2014-2021 Firejail Authors
*
* This file is part of firejail project
*
* This program 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.
*
* This program 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 "firejail.h"
#include <string.h>
#include <stdbool.h>
#include <stdio.h>
#include <linux/limits.h>
#include <assert.h>
#include <errno.h>
static int cmdline_length(int argc, char **argv, int index, bool want_extra_quotes) {
assert(index != -1);
unsigned i,j;
int len = 0;
unsigned argcnt = argc - index;
bool in_quotes = false;
for (i = 0; i < argcnt; i++) {
in_quotes = false;
for (j = 0; j < strlen(argv[i + index]); j++) {
if (argv[i + index][j] == '\'') {
if (in_quotes)
len++;
if (j > 0 && argv[i + index][j-1] == '\'')
len++;
else
len += 3;
in_quotes = false;
} else {
if (!in_quotes && want_extra_quotes)
len++;
len++;
if (want_extra_quotes)
in_quotes = true;
}
}
if (in_quotes) {
len++;
}
if (strlen(argv[i + index]) == 0) {
len += 2;
}
len++;
}
return len;
}
static void quote_cmdline(char *command_line, char *window_title, int len, int argc, char **argv, int index, bool want_extra_quotes) {
assert(index != -1);
unsigned i,j;
unsigned argcnt = argc - index;
bool in_quotes = false;
char *ptr1 = command_line;
char *ptr2 = window_title;
for (i = 0; i < argcnt; i++) {
// enclose args by single quotes,
// and since single quote can't be represented in single quoted text
// each occurrence of it should be enclosed by double quotes
in_quotes = false;
for (j = 0; j < strlen(argv[i + index]); j++) {
// single quote
if (argv[i + index][j] == '\'') {
if (in_quotes) {
// close quotes
ptr1[0] = '\'';
ptr1++;
}
// previous char was single quote too
if (j > 0 && argv[i + index][j-1] == '\'') {
ptr1--;
sprintf(ptr1, "\'\"");
}
// this first in series
else
{
sprintf(ptr1, "\"\'\"");
}
ptr1 += strlen(ptr1);
in_quotes = false;
}
// anything other
else
{
if (!in_quotes && want_extra_quotes) {
// open quotes
ptr1[0] = '\'';
ptr1++;
}
ptr1[0] = argv[i + index][j];
ptr1++;
if (want_extra_quotes)
in_quotes = true;
}
}
// close quotes
if (in_quotes) {
ptr1[0] = '\'';
ptr1++;
}
// handle empty argument case
if (strlen(argv[i + index]) == 0) {
sprintf(ptr1, "\'\'");
ptr1 += strlen(ptr1);
}
// add space
sprintf(ptr1, " ");
ptr1 += strlen(ptr1);
sprintf(ptr2, "%s ", argv[i + index]);
ptr2 += strlen(ptr2);
}
assert((unsigned) len == strlen(command_line));
}
void build_cmdline(char **command_line, char **window_title, int argc, char **argv, int index, bool want_extra_quotes) {
// index == -1 could happen if we have --shell=none and no program was specified
// the program should exit with an error before entering this function
assert(index != -1);
int len = cmdline_length(argc, argv, index, want_extra_quotes);
if (len > ARG_MAX) {
errno = E2BIG;
errExit("cmdline_length");
}
*command_line = malloc(len + 1);
if (!*command_line)
errExit("malloc");
*window_title = malloc(len + 1);
if (!*window_title)
errExit("malloc");
quote_cmdline(*command_line, *window_title, len, argc, argv, index, want_extra_quotes);
if (arg_debug)
printf("Building quoted command line: %s\n", *command_line);
assert(*command_line);
assert(*window_title);
}
void build_appimage_cmdline(char **command_line, char **window_title, int argc, char **argv, int index, bool want_extra_quotes) {
// index == -1 could happen if we have --shell=none and no program was specified
// the program should exit with an error before entering this function
assert(index != -1);
char *apprun_path = RUN_FIREJAIL_APPIMAGE_DIR "/AppRun";
int len1 = cmdline_length(argc, argv, index, want_extra_quotes); // length of argv w/o changes
int len2 = cmdline_length(1, &argv[index], 0, want_extra_quotes); // apptest.AppImage
int len3 = cmdline_length(1, &apprun_path, 0, want_extra_quotes); // /run/firejail/appimage/AppRun
int len4 = (len1 - len2 + len3) + 1; // apptest.AppImage is replaced by /path/to/AppRun
if (len4 > ARG_MAX) {
errno = E2BIG;
errExit("cmdline_length");
}
// TODO: deal with extra allocated memory.
char *command_line_tmp = malloc(len1 + len3 + 1);
if (!command_line_tmp)
errExit("malloc");
*window_title = malloc(len1 + len3 + 1);
if (!*window_title)
errExit("malloc");
// run default quote_cmdline
quote_cmdline(command_line_tmp, *window_title, len1, argc, argv, index, want_extra_quotes);
assert(command_line_tmp);
assert(*window_title);
// 'fix' command_line now
if (asprintf(command_line, "'%s' %s", apprun_path, command_line_tmp + len2) == -1)
errExit("asprintf");
if (arg_debug)
printf("AppImage quoted command line: %s\n", *command_line);
// free strdup
free(command_line_tmp);
}
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