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config: More cleverly skip unrecognized or malformed commands.

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This commit is contained in:
Kalle Olavi Niemitalo 2008-02-03 04:38:24 +02:00 committed by Kalle Olavi Niemitalo
parent e06416d248
commit e7bd23ff37
1 changed files with 43 additions and 14 deletions
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57
src/config/conf.c
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@ -173,6 +173,22 @@ skip_option_value(struct conf_parsing_pos *pos)
}
}
/** Skip to the next newline or comment that is not part of a quoted
* string. When ELinks hits a parse error in the configuration file,
* it calls this in order to find the place where is should resume
* parsing. This is intended to prevent ELinks from treating words
* in strings as commands. */
static void
skip_to_unquoted_newline_or_comment(struct conf_parsing_pos *pos)
{
while (*pos->look && *pos->look != '#' && *pos->look != '\n') {
if (isquote(*pos->look))
skip_quoted(pos);
else
pos->look++;
}
}
/* Parse a command. Returns error code. */
/* If dynamic string credentials are supplied, we will mirror the command at
* the end of the string; however, we won't load the option value to the tree,
@ -331,27 +347,32 @@ static enum parse_error
parse_bind(struct option *opt_tree, struct conf_parsing_state *state,
struct string *mirror, int is_system_conf)
{
unsigned char *next_pos;
unsigned char *keymap, *keystroke, *action;
enum parse_error err = ERROR_NONE;
struct conf_parsing_pos before_error;
skip_white(&state->pos);
if (!*state->pos.look) return show_parse_error(state, ERROR_PARSE);
/* Keymap */
before_error = state->pos;
keymap = option_types[OPT_STRING].read(NULL, &state->pos.look,
&state->pos.line);
skip_white(&state->pos);
if (!keymap || !*state->pos.look)
return show_parse_error(state, ERROR_OPTION);
if (!keymap || !*state->pos.look) {
state->pos = before_error;
return show_parse_error(state, ERROR_PARSE);
}
/* Keystroke */
before_error = state->pos;
keystroke = option_types[OPT_STRING].read(NULL, &state->pos.look,
&state->pos.line);
skip_white(&state->pos);
if (!keystroke || !*state->pos.look) {
mem_free(keymap); mem_free_if(keystroke);
return show_parse_error(state, ERROR_OPTION);
state->pos = before_error;
return show_parse_error(state, ERROR_PARSE);
}
/* Equal sign */
@ -369,12 +390,13 @@ parse_bind(struct option *opt_tree, struct conf_parsing_state *state,
}
/* Action */
next_pos = state->pos.look;
before_error = state->pos;
action = option_types[OPT_STRING].read(NULL, &state->pos.look,
&state->pos.line);
if (!action) {
mem_free(keymap); mem_free(keystroke);
return show_parse_error(state, ERROR_VALUE);
state->pos = before_error;
return show_parse_error(state, ERROR_PARSE);
}
if (mirror) {
@ -383,7 +405,7 @@ parse_bind(struct option *opt_tree, struct conf_parsing_state *state,
if (act_str) {
add_bytes_to_string(mirror, state->mirrored,
next_pos - state->mirrored);
before_error.look - state->mirrored);
add_to_string(mirror, act_str);
mem_free(act_str);
state->mirrored = state->pos.look;
@ -413,6 +435,7 @@ parse_include(struct option *opt_tree, struct conf_parsing_state *state,
{
unsigned char *fname;
struct string dumbstring;
struct conf_parsing_pos before_error;
if (!init_string(&dumbstring))
return show_parse_error(state, ERROR_NOMEM);
@ -424,11 +447,13 @@ parse_include(struct option *opt_tree, struct conf_parsing_state *state,
}
/* File name */
before_error = state->pos;
fname = option_types[OPT_STRING].read(NULL, &state->pos.look,
&state->pos.line);
if (!fname) {
done_string(&dumbstring);
return show_parse_error(state, ERROR_VALUE);
state->pos = before_error;
return show_parse_error(state, ERROR_PARSE);
}
/* We want load_config_file() to watermark stuff, but not to load
@ -551,12 +576,14 @@ parse_config_file(struct option *options, unsigned char *name,
err = parse_config_command(options, &state, mirror,
is_system_conf);
switch (err) {
case ERROR_NONE:
break;
if (err == ERROR_COMMAND) {
case ERROR_COMMAND:
case ERROR_PARSE:
/* Jump over this crap we can't understand. */
while (!isspace(*state.pos.look)
&& *state.pos.look != '#' && *state.pos.look)
state.pos.look++;
skip_to_unquoted_newline_or_comment(&state.pos);
/* Mirror what we already have */
if (mirror) {
@ -564,10 +591,12 @@ parse_config_file(struct option *options, unsigned char *name,
state.pos.look - state.mirrored);
state.mirrored = state.pos.look;
}
}
if (err != ERROR_NONE)
/* fall through */
default:
error_occurred = 1;
break;
}
}
if (!error_occurred || !state.filename) return;