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actions.c
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actions.c
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const char actions_rcs[] = "$Id: actions.c,v 1.84 2012/07/27 17:39:57 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/actions.c,v $
*
* Purpose : Declares functions to work with actions files
*
* Copyright : Written by and Copyright (C) 2001-2011 the
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
* 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.
*
* The GNU General Public License should be included with
* this file. If not, you can view it at
* http://www.gnu.org/copyleft/gpl.html
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*********************************************************************/
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#ifdef FEATURE_PTHREAD
#include <pthread.h>
#endif
#include "project.h"
#include "jcc.h"
#include "list.h"
#include "actions.h"
#include "miscutil.h"
#include "errlog.h"
#include "loaders.h"
#include "encode.h"
#include "urlmatch.h"
#include "cgi.h"
#include "ssplit.h"
const char actions_h_rcs[] = ACTIONS_H_VERSION;
/*
* We need the main list of options.
*
* First, we need a way to tell between boolean, string, and multi-string
* options. For string and multistring options, we also need to be
* able to tell the difference between a "+" and a "-". (For bools,
* the "+"/"-" information is encoded in "add" and "mask"). So we use
* an enumerated type (well, the preprocessor equivalent). Here are
* the values:
*/
enum action_value_type {
AV_NONE = 0, /* +opt -opt */
AV_ADD_STRING = 1, /* +stropt{string} */
AV_REM_STRING = 2, /* -stropt */
AV_ADD_MULTI = 3, /* +multiopt{string} +multiopt{string2} */
AV_REM_MULTI = 4 /* -multiopt{string} -multiopt */
};
/*
* We need a structure to hold the name, flag changes,
* type, and string index.
*/
struct action_name
{
const char * name;
unsigned long mask; /* a bit set to "0" = remove action */
unsigned long add; /* a bit set to "1" = add action */
enum action_value_type value_type; /* an AV_... constant */
int index; /* index into strings[] or multi[] */
};
/*
* And with those building blocks in place, here's the array.
*/
static const struct action_name action_names[] =
{
/*
* Well actually there's no data here - it's in actionlist.h
* This keeps it together to make it easy to change.
*
* Here's the macros used to format it:
*/
#define DEFINE_ACTION_MULTI(name,index) \
{ "+" name, ACTION_MASK_ALL, 0, AV_ADD_MULTI, index }, \
{ "-" name, ACTION_MASK_ALL, 0, AV_REM_MULTI, index },
#define DEFINE_ACTION_STRING(name,flag,index) \
{ "+" name, ACTION_MASK_ALL, flag, AV_ADD_STRING, index }, \
{ "-" name, ~flag, 0, AV_REM_STRING, index },
#define DEFINE_ACTION_BOOL(name,flag) \
{ "+" name, ACTION_MASK_ALL, flag }, \
{ "-" name, ~flag, 0 },
#define DEFINE_ACTION_ALIAS 1 /* Want aliases please */
#include "actionlist.h"
#undef DEFINE_ACTION_MULTI
#undef DEFINE_ACTION_STRING
#undef DEFINE_ACTION_BOOL
#undef DEFINE_ACTION_ALIAS
{ NULL, 0, 0 } /* End marker */
};
static int load_one_actions_file(struct client_state *csp, int fileid);
/*********************************************************************
*
* Function : merge_actions
*
* Description : Merge two actions together.
* Similar to "dest += src".
*
* Parameters :
* 1 : dest = Actions to modify.
* 2 : src = Action to add.
*
* Returns : JB_ERR_OK or JB_ERR_MEMORY
*
*********************************************************************/
jb_err merge_actions (struct action_spec *dest,
const struct action_spec *src)
{
int i;
jb_err err;
dest->mask &= src->mask;
dest->add &= src->mask;
dest->add |= src->add;
for (i = 0; i < ACTION_STRING_COUNT; i++)
{
char * str = src->string[i];
if (str)
{
freez(dest->string[i]);
dest->string[i] = strdup(str);
if (NULL == dest->string[i])
{
return JB_ERR_MEMORY;
}
}
}
for (i = 0; i < ACTION_MULTI_COUNT; i++)
{
if (src->multi_remove_all[i])
{
/* Remove everything from dest */
list_remove_all(dest->multi_remove[i]);
dest->multi_remove_all[i] = 1;
err = list_duplicate(dest->multi_add[i], src->multi_add[i]);
}
else if (dest->multi_remove_all[i])
{
/*
* dest already removes everything, so we only need to worry
* about what we add.
*/
list_remove_list(dest->multi_add[i], src->multi_remove[i]);
err = list_append_list_unique(dest->multi_add[i], src->multi_add[i]);
}
else
{
/* No "remove all"s to worry about. */
list_remove_list(dest->multi_add[i], src->multi_remove[i]);
err = list_append_list_unique(dest->multi_remove[i], src->multi_remove[i]);
if (!err) err = list_append_list_unique(dest->multi_add[i], src->multi_add[i]);
}
if (err)
{
return err;
}
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : copy_action
*
* Description : Copy an action_specs.
* Similar to "dest = src".
*
* Parameters :
* 1 : dest = Destination of copy.
* 2 : src = Source for copy.
*
* Returns : N/A
*
*********************************************************************/
jb_err copy_action (struct action_spec *dest,
const struct action_spec *src)
{
int i;
jb_err err = JB_ERR_OK;
free_action(dest);
memset(dest, '\0', sizeof(*dest));
dest->mask = src->mask;
dest->add = src->add;
for (i = 0; i < ACTION_STRING_COUNT; i++)
{
char * str = src->string[i];
if (str)
{
str = strdup(str);
if (!str)
{
return JB_ERR_MEMORY;
}
dest->string[i] = str;
}
}
for (i = 0; i < ACTION_MULTI_COUNT; i++)
{
dest->multi_remove_all[i] = src->multi_remove_all[i];
err = list_duplicate(dest->multi_remove[i], src->multi_remove[i]);
if (err)
{
return err;
}
err = list_duplicate(dest->multi_add[i], src->multi_add[i]);
if (err)
{
return err;
}
}
return err;
}
/*********************************************************************
*
* Function : free_action_spec
*
* Description : Frees an action_spec and the memory used by it.
*
* Parameters :
* 1 : src = Source to free.
*
* Returns : N/A
*
*********************************************************************/
void free_action_spec(struct action_spec *src)
{
free_action(src);
freez(src);
}
/*********************************************************************
*
* Function : free_action
*
* Description : Destroy an action_spec. Frees memory used by it,
* except for the memory used by the struct action_spec
* itself.
*
* Parameters :
* 1 : src = Source to free.
*
* Returns : N/A
*
*********************************************************************/
void free_action (struct action_spec *src)
{
int i;
if (src == NULL)
{
return;
}
for (i = 0; i < ACTION_STRING_COUNT; i++)
{
freez(src->string[i]);
}
for (i = 0; i < ACTION_MULTI_COUNT; i++)
{
destroy_list(src->multi_remove[i]);
destroy_list(src->multi_add[i]);
}
memset(src, '\0', sizeof(*src));
}
/*********************************************************************
*
* Function : get_action_token
*
* Description : Parses a line for the first action.
* Modifies its input array, doesn't allocate memory.
* e.g. given:
* *line=" +abc{def} -ghi "
* Returns:
* *line=" -ghi "
* *name="+abc"
* *value="def"
*
* Parameters :
* 1 : line = [in] The line containing the action.
* [out] Start of next action on line, or
* NULL if we reached the end of line before
* we found an action.
* 2 : name = [out] Start of action name, null
* terminated. NULL on EOL
* 3 : value = [out] Start of action value, null
* terminated. NULL if none or EOL.
*
* Returns : JB_ERR_OK => Ok
* JB_ERR_PARSE => Mismatched {} (line was trashed anyway)
*
*********************************************************************/
jb_err get_action_token(char **line, char **name, char **value)
{
char * str = *line;
char ch;
/* set default returns */
*line = NULL;
*name = NULL;
*value = NULL;
/* Eat any leading whitespace */
while ((*str == ' ') || (*str == '\t'))
{
str++;
}
if (*str == '\0')
{
return 0;
}
if (*str == '{')
{
/* null name, just value is prohibited */
return JB_ERR_PARSE;
}
*name = str;
/* parse option */
while (((ch = *str) != '\0') &&
(ch != ' ') && (ch != '\t') && (ch != '{'))
{
if (ch == '}')
{
/* error, '}' without '{' */
return JB_ERR_PARSE;
}
str++;
}
*str = '\0';
if (ch != '{')
{
/* no value */
if (ch == '\0')
{
/* EOL - be careful not to run off buffer */
*line = str;
}
else
{
/* More to parse next time. */
*line = str + 1;
}
return JB_ERR_OK;
}
str++;
*value = str;
str = strchr(str, '}');
if (str == NULL)
{
/* error */
*value = NULL;
return JB_ERR_PARSE;
}
/* got value */
*str = '\0';
*line = str + 1;
chomp(*value);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : action_used_to_be_valid
*
* Description : Checks if unrecognized actions were valid in earlier
* releases.
*
* Parameters :
* 1 : action = The string containing the action to check.
*
* Returns : True if yes, otherwise false.
*
*********************************************************************/
static int action_used_to_be_valid(const char *action)
{
static const char * const formerly_valid_actions[] = {
"inspect-jpegs",
"kill-popups",
"send-vanilla-wafer",
"send-wafer",
"treat-forbidden-connects-like-blocks",
"vanilla-wafer",
"wafer"
};
unsigned int i;
for (i = 0; i < SZ(formerly_valid_actions); i++)
{
if (0 == strcmpic(action, formerly_valid_actions[i]))
{
return TRUE;
}
}
return FALSE;
}
/*********************************************************************
*
* Function : get_actions
*
* Description : Parses a list of actions.
*
* Parameters :
* 1 : line = The string containing the actions.
* Will be written to by this function.
* 2 : alias_list = Custom alias list, or NULL for none.
* 3 : cur_action = Where to store the action. Caller
* allocates memory.
*
* Returns : JB_ERR_OK => Ok
* JB_ERR_PARSE => Parse error (line was trashed anyway)
* nonzero => Out of memory (line was trashed anyway)
*
*********************************************************************/
jb_err get_actions(char *line,
struct action_alias * alias_list,
struct action_spec *cur_action)
{
jb_err err;
init_action(cur_action);
cur_action->mask = ACTION_MASK_ALL;
while (line)
{
char * option = NULL;
char * value = NULL;
err = get_action_token(&line, &option, &value);
if (err)
{
return err;
}
if (option)
{
/* handle option in 'option' */
/* Check for standard action name */
const struct action_name * action = action_names;
while ((action->name != NULL) && (0 != strcmpic(action->name, option)))
{
action++;
}
if (action->name != NULL)
{
/* Found it */
cur_action->mask &= action->mask;
cur_action->add &= action->mask;
cur_action->add |= action->add;
switch (action->value_type)
{
case AV_NONE:
/* ignore any option. */
break;
case AV_ADD_STRING:
{
/* add single string. */
if ((value == NULL) || (*value == '\0'))
{
if (0 == strcmpic(action->name, "+block"))
{
/*
* XXX: Temporary backwards compatibility hack.
* XXX: should include line number.
*/
value = "No reason specified.";
log_error(LOG_LEVEL_ERROR,
"block action without reason found. This may "
"become a fatal error in future versions.");
}
else
{
return JB_ERR_PARSE;
}
}
/* FIXME: should validate option string here */
freez (cur_action->string[action->index]);
cur_action->string[action->index] = strdup(value);
if (NULL == cur_action->string[action->index])
{
return JB_ERR_MEMORY;
}
break;
}
case AV_REM_STRING:
{
/* remove single string. */
freez (cur_action->string[action->index]);
break;
}
case AV_ADD_MULTI:
{
/* append multi string. */
struct list * remove_p = cur_action->multi_remove[action->index];
struct list * add_p = cur_action->multi_add[action->index];
if ((value == NULL) || (*value == '\0'))
{
return JB_ERR_PARSE;
}
list_remove_item(remove_p, value);
err = enlist_unique(add_p, value, 0);
if (err)
{
return err;
}
break;
}
case AV_REM_MULTI:
{
/* remove multi string. */
struct list * remove_p = cur_action->multi_remove[action->index];
struct list * add_p = cur_action->multi_add[action->index];
if ((value == NULL) || (*value == '\0')
|| ((*value == '*') && (value[1] == '\0')))
{
/*
* no option, or option == "*".
*
* Remove *ALL*.
*/
list_remove_all(remove_p);
list_remove_all(add_p);
cur_action->multi_remove_all[action->index] = 1;
}
else
{
/* Valid option - remove only 1 option */
if (!cur_action->multi_remove_all[action->index])
{
/* there isn't a catch-all in the remove list already */
err = enlist_unique(remove_p, value, 0);
if (err)
{
return err;
}
}
list_remove_item(add_p, value);
}
break;
}
default:
/* Shouldn't get here unless there's memory corruption. */
assert(0);
return JB_ERR_PARSE;
}
}
else
{
/* try user aliases. */
const struct action_alias * alias = alias_list;
while ((alias != NULL) && (0 != strcmpic(alias->name, option)))
{
alias = alias->next;
}
if (alias != NULL)
{
/* Found it */
merge_actions(cur_action, alias->action);
}
else if (((size_t)2 < strlen(option)) && action_used_to_be_valid(option+1))
{
log_error(LOG_LEVEL_ERROR, "Action '%s' is no longer valid "
"in this Privoxy release. Ignored.", option+1);
}
else if (((size_t)2 < strlen(option)) && 0 == strcmpic(option+1, "hide-forwarded-for-headers"))
{
log_error(LOG_LEVEL_FATAL, "The action 'hide-forwarded-for-headers' "
"is no longer valid in this Privoxy release. "
"Use 'change-x-forwarded-for' instead.");
}
else
{
/* Bad action name */
/*
* XXX: This is a fatal error and Privoxy will later on exit
* in load_one_actions_file() because of an "invalid line".
*
* It would be preferable to name the offending option in that
* error message, but currently there is no way to do that and
* we have to live with two error messages for basically the
* same reason.
*/
log_error(LOG_LEVEL_ERROR, "Unknown action or alias: %s", option);
return JB_ERR_PARSE;
}
}
}
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : init_current_action
*
* Description : Zero out an action.
*
* Parameters :
* 1 : dest = An uninitialized current_action_spec.
*
* Returns : N/A
*
*********************************************************************/
void init_current_action (struct current_action_spec *dest)
{
memset(dest, '\0', sizeof(*dest));
dest->flags = ACTION_MOST_COMPATIBLE;
}
/*********************************************************************
*
* Function : init_action
*
* Description : Zero out an action.
*
* Parameters :
* 1 : dest = An uninitialized action_spec.
*
* Returns : N/A
*
*********************************************************************/
void init_action (struct action_spec *dest)
{
memset(dest, '\0', sizeof(*dest));
}
/*********************************************************************
*
* Function : merge_current_action
*
* Description : Merge two actions together.
* Similar to "dest += src".
* Differences between this and merge_actions()
* is that this one doesn't allocate memory for
* strings (so "src" better be in memory for at least
* as long as "dest" is, and you'd better free
* "dest" using "free_current_action").
* Also, there is no mask or remove lists in dest.
* (If we're applying it to a URL, we don't need them)
*
* Parameters :
* 1 : dest = Current actions, to modify.
* 2 : src = Action to add.
*
* Returns 0 : no error
* !=0 : error, probably JB_ERR_MEMORY.
*
*********************************************************************/
jb_err merge_current_action (struct current_action_spec *dest,
const struct action_spec *src)
{
int i;
jb_err err = JB_ERR_OK;
dest->flags &= src->mask;
dest->flags |= src->add;
for (i = 0; i < ACTION_STRING_COUNT; i++)
{
char * str = src->string[i];
if (str)
{
str = strdup(str);
if (!str)
{
return JB_ERR_MEMORY;
}
freez(dest->string[i]);
dest->string[i] = str;
}
}
for (i = 0; i < ACTION_MULTI_COUNT; i++)
{
if (src->multi_remove_all[i])
{
/* Remove everything from dest, then add src->multi_add */
err = list_duplicate(dest->multi[i], src->multi_add[i]);
if (err)
{
return err;
}
}
else
{
list_remove_list(dest->multi[i], src->multi_remove[i]);
err = list_append_list_unique(dest->multi[i], src->multi_add[i]);
if (err)
{
return err;
}
}
}
return err;
}
/*********************************************************************
*
* Function : update_action_bits_for_tag
*
* Description : Updates the action bits based on the action sections
* whose tag patterns match a provided tag.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* 2 : tag = The tag on which the update should be based on
*
* Returns : 0 if no tag matched, or
* 1 otherwise
*
*********************************************************************/
int update_action_bits_for_tag(struct client_state *csp, const char *tag)
{
struct file_list *fl;
struct url_actions *b;
int updated = 0;
int i;
assert(tag);
assert(list_contains_item(csp->tags, tag));
/* Run through all action files, */
for (i = 0; i < MAX_AF_FILES; i++)
{
if (((fl = csp->actions_list[i]) == NULL) || ((b = fl->f) == NULL))
{
/* Skip empty files */
continue;
}
/* and through all the action patterns, */
for (b = b->next; NULL != b; b = b->next)
{
/* skip the URL patterns, */
if (NULL == b->url->tag_regex)
{
continue;
}
/* and check if one of the tag patterns matches the tag, */
if (0 == regexec(b->url->tag_regex, tag, 0, NULL, 0))
{
/* if it does, update the action bit map, */
if (merge_current_action(csp->action, b->action))
{
log_error(LOG_LEVEL_ERROR,
"Out of memory while changing action bits");
}
/* and signal the change. */
updated = 1;
}
}
}
return updated;
}
/*********************************************************************
*
* Function : free_current_action
*
* Description : Free memory used by a current_action_spec.
* Does not free the current_action_spec itself.
*
* Parameters :
* 1 : src = Source to free.
*
* Returns : N/A
*
*********************************************************************/
void free_current_action(struct current_action_spec *src)
{
int i;
for (i = 0; i < ACTION_STRING_COUNT; i++)
{
freez(src->string[i]);
}
for (i = 0; i < ACTION_MULTI_COUNT; i++)
{
destroy_list(src->multi[i]);
}
memset(src, '\0', sizeof(*src));
}
static struct file_list *current_actions_file[MAX_AF_FILES] = {
NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL
};
#ifdef FEATURE_GRACEFUL_TERMINATION
/*********************************************************************
*
* Function : unload_current_actions_file
*
* Description : Unloads current actions file - reset to state at
* beginning of program.
*
* Parameters : None
*
* Returns : N/A
*
*********************************************************************/
void unload_current_actions_file(void)
{
int i;
for (i = 0; i < MAX_AF_FILES; i++)
{
if (current_actions_file[i])
{
current_actions_file[i]->unloader = unload_actions_file;
current_actions_file[i] = NULL;
}
}
}
#endif /* FEATURE_GRACEFUL_TERMINATION */
/*********************************************************************
*
* Function : unload_actions_file
*
* Description : Unloads an actions module.
*
* Parameters :
* 1 : file_data = the data structure associated with the
* actions file.
*
* Returns : N/A
*
*********************************************************************/
void unload_actions_file(void *file_data)
{
struct url_actions * next;
struct url_actions * cur = (struct url_actions *)file_data;
while (cur != NULL)
{
next = cur->next;
free_url_spec(cur->url);
if ((next == NULL) || (next->action != cur->action))
{
/*
* As the action settings might be shared,
* we can only free them if the current
* url pattern is the last one, or if the
* next one is using different settings.
*/
free_action_spec(cur->action);
}
freez(cur);
cur = next;
}
}
/*********************************************************************
*
* Function : free_alias_list
*
* Description : Free memory used by a list of aliases.
*
* Parameters :
* 1 : alias_list = Linked list to free.
*
* Returns : N/A
*
*********************************************************************/
void free_alias_list(struct action_alias *alias_list)
{
while (alias_list != NULL)
{
struct action_alias * next = alias_list->next;
alias_list->next = NULL;
freez(alias_list->name);
free_action(alias_list->action);
free(alias_list);
alias_list = next;
}
}
/*********************************************************************
*
* Function : load_action_files
*
* Description : Read and parse all the action files and add to files
* list.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
int load_action_files(struct client_state *csp)
{
int i;
int result;
for (i = 0; i < MAX_AF_FILES; i++)
{
if (csp->config->actions_file[i])
{
result = load_one_actions_file(csp, i);
if (result)
{
return result;
}
}
else if (current_actions_file[i])
{
current_actions_file[i]->unloader = unload_actions_file;
current_actions_file[i] = NULL;