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tor-android/external/privoxy/loaders.c

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const char loaders_rcs[] = "$Id: loaders.c,v 1.87 2011/11/06 11:53:15 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/loaders.c,v $
*
* Purpose : Functions to load and unload the various
* configuration files. Also contains code to manage
* the list of active loaders, and to automatically
* unload files that are no longer in use.
*
* Copyright : Written by and Copyright (C) 2001-2010 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 <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include <ctype.h>
#include <assert.h>
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif
#include "project.h"
#include "list.h"
#include "loaders.h"
#include "filters.h"
#include "parsers.h"
#include "jcc.h"
#include "miscutil.h"
#include "errlog.h"
#include "actions.h"
#include "urlmatch.h"
#include "encode.h"
const char loaders_h_rcs[] = LOADERS_H_VERSION;
/*
* Currently active files.
* These are also entered in the main linked list of files.
*/
#ifdef FEATURE_TRUST
static struct file_list *current_trustfile = NULL;
#endif /* def FEATURE_TRUST */
static int load_one_re_filterfile(struct client_state *csp, int fileid);
static struct file_list *current_re_filterfile[MAX_AF_FILES] = {
NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL
};
/*
* Pseudo filter type for load_one_re_filterfile
*/
#define NO_NEW_FILTER -1
/*********************************************************************
*
* Function : sweep
*
* Description : Basically a mark and sweep garbage collector, it is run
* (by the parent thread) every once in a while to reclaim memory.
*
* It uses a mark and sweep strategy:
* 1) mark all files as inactive
*
* 2) check with each client:
* if it is active, mark its files as active
* if it is inactive, free its resources
*
* 3) free the resources of all of the files that
* are still marked as inactive (and are obsolete).
*
* N.B. files that are not obsolete don't have an unloader defined.
*
* Parameters : None
*
* Returns : The number of threads that are still active.
*
*********************************************************************/
unsigned int sweep(void)
{
struct file_list *fl, *nfl;
struct client_state *csp;
struct client_states *last_active, *client_list;
int i;
unsigned int active_threads = 0;
/* clear all of the file's active flags */
for ( fl = files->next; NULL != fl; fl = fl->next )
{
fl->active = 0;
}
last_active = clients;
client_list = clients->next;
while (NULL != client_list)
{
csp = &client_list->csp;
if (csp->flags & CSP_FLAG_ACTIVE)
{
/* Mark this client's files as active */
/*
* Always have a configuration file.
* (Also note the slightly non-standard extra
* indirection here.)
*/
csp->config->config_file_list->active = 1;
/*
* Actions files
*/
for (i = 0; i < MAX_AF_FILES; i++)
{
if (csp->actions_list[i])
{
csp->actions_list[i]->active = 1;
}
}
/*
* Filter files
*/
for (i = 0; i < MAX_AF_FILES; i++)
{
if (csp->rlist[i])
{
csp->rlist[i]->active = 1;
}
}
/*
* Trust file
*/
#ifdef FEATURE_TRUST
if (csp->tlist)
{
csp->tlist->active = 1;
}
#endif /* def FEATURE_TRUST */
active_threads++;
last_active = client_list;
client_list = client_list->next;
}
else
/*
* This client is not active. Free its resources.
*/
{
last_active->next = client_list->next;
freez(csp->ip_addr_str);
freez(csp->iob->buf);
freez(csp->error_message);
if (csp->action->flags & ACTION_FORWARD_OVERRIDE &&
NULL != csp->fwd)
{
unload_forward_spec(csp->fwd);
}
free_http_request(csp->http);
destroy_list(csp->headers);
destroy_list(csp->tags);
free_current_action(csp->action);
#ifdef FEATURE_STATISTICS
urls_read++;
if (csp->flags & CSP_FLAG_REJECTED)
{
urls_rejected++;
}
#endif /* def FEATURE_STATISTICS */
freez(client_list);
client_list = last_active->next;
}
}
nfl = files;
fl = files->next;
while (fl != NULL)
{
if ( ( 0 == fl->active ) && ( NULL != fl->unloader ) )
{
nfl->next = fl->next;
(fl->unloader)(fl->f);
freez(fl->filename);
freez(fl);
fl = nfl->next;
}
else
{
nfl = fl;
fl = fl->next;
}
}
return active_threads;
}
/*********************************************************************
*
* Function : check_file_changed
*
* Description : Helper function to check if a file needs reloading.
* If "current" is still current, return it. Otherwise
* allocates a new (zeroed) "struct file_list", fills
* in the disk file name and timestamp, and returns it.
*
* Parameters :
* 1 : current = The file_list currently being used - will
* be checked to see if it is out of date.
* May be NULL (which is treated as out of
* date).
* 2 : filename = Name of file to check.
* 3 : newfl = New file list. [Output only]
* This will be set to NULL, OR a struct
* file_list newly allocated on the
* heap, with the filename and lastmodified
* fields filled, and all others zeroed.
*
* Returns : If file unchanged: 0 (and sets newfl == NULL)
* If file changed: 1 and sets newfl != NULL
* On error: 1 and sets newfl == NULL
*
*********************************************************************/
int check_file_changed(const struct file_list * current,
const char * filename,
struct file_list ** newfl)
{
struct file_list *fs;
struct stat statbuf[1];
*newfl = NULL;
if (stat(filename, statbuf) < 0)
{
/* Error, probably file not found. */
return 1;
}
if (current
&& (current->lastmodified == statbuf->st_mtime)
&& (0 == strcmp(current->filename, filename)))
{
return 0;
}
fs = (struct file_list *)zalloc(sizeof(struct file_list));
if (fs == NULL)
{
/* Out of memory error */
return 1;
}
fs->filename = strdup(filename);
fs->lastmodified = statbuf->st_mtime;
if (fs->filename == NULL)
{
/* Out of memory error */
freez (fs);
return 1;
}
*newfl = fs;
return 1;
}
/*********************************************************************
*
* Function : simple_read_line
*
* Description : Read a single line from a file and return it.
* This is basically a version of fgets() that malloc()s
* it's own line buffer. Note that the buffer will
* always be a multiple of BUFFER_SIZE bytes long.
* Therefore if you are going to keep the string for
* an extended period of time, you should probably
* strdup() it and free() the original, to save memory.
*
*
* Parameters :
* 1 : dest = destination for newly malloc'd pointer to
* line data. Will be set to NULL on error.
* 2 : fp = File to read from
* 3 : newline = Standard for newlines in the file.
* Will be unchanged if it's value on input is not
* NEWLINE_UNKNOWN.
* On output, may be changed from NEWLINE_UNKNOWN to
* actual convention in file.
*
* Returns : JB_ERR_OK on success
* JB_ERR_MEMORY on out-of-memory
* JB_ERR_FILE on EOF.
*
*********************************************************************/
jb_err simple_read_line(FILE *fp, char **dest, int *newline)
{
size_t len = 0;
size_t buflen = BUFFER_SIZE;
char * buf;
char * p;
int ch;
int realnewline = NEWLINE_UNKNOWN;
if (NULL == (buf = malloc(buflen)))
{
return JB_ERR_MEMORY;
}
p = buf;
/*
* Character codes. If you have a weird compiler and the following are
* incorrect, you also need to fix NEWLINE() in loaders.h
*/
#define CHAR_CR '\r' /* ASCII 13 */
#define CHAR_LF '\n' /* ASCII 10 */
for (;;)
{
ch = getc(fp);
if (ch == EOF)
{
if (len > 0)
{
*p = '\0';
*dest = buf;
return JB_ERR_OK;
}
else
{
free(buf);
*dest = NULL;
return JB_ERR_FILE;
}
}
else if (ch == CHAR_CR)
{
ch = getc(fp);
if (ch == CHAR_LF)
{
if (*newline == NEWLINE_UNKNOWN)
{
*newline = NEWLINE_DOS;
}
}
else
{
if (ch != EOF)
{
ungetc(ch, fp);
}
if (*newline == NEWLINE_UNKNOWN)
{
*newline = NEWLINE_MAC;
}
}
*p = '\0';
*dest = buf;
if (*newline == NEWLINE_UNKNOWN)
{
*newline = realnewline;
}
return JB_ERR_OK;
}
else if (ch == CHAR_LF)
{
*p = '\0';
*dest = buf;
if (*newline == NEWLINE_UNKNOWN)
{
*newline = NEWLINE_UNIX;
}
return JB_ERR_OK;
}
else if (ch == 0)
{
*p = '\0';
*dest = buf;
return JB_ERR_OK;
}
*p++ = (char)ch;
if (++len >= buflen)
{
buflen += BUFFER_SIZE;
if (NULL == (p = realloc(buf, buflen)))
{
free(buf);
return JB_ERR_MEMORY;
}
buf = p;
p = buf + len;
}
}
}
/*********************************************************************
*
* Function : edit_read_line
*
* Description : Read a single non-empty line from a file and return
* it. Trims comments, leading and trailing whitespace
* and respects escaping of newline and comment char.
* Provides the line in 2 alternative forms: raw and
* preprocessed.
* - raw is the raw data read from the file. If the
* line is not modified, then this should be written
* to the new file.
* - prefix is any comments and blank lines that were
* read from the file. If the line is modified, then
* this should be written out to the file followed
* by the modified data. (If this string is non-empty
* then it will have a newline at the end).
* - data is the actual data that will be parsed
* further by appropriate routines.
* On EOF, the 3 strings will all be set to NULL and
* 0 will be returned.
*
* Parameters :
* 1 : fp = File to read from
* 2 : raw_out = destination for newly malloc'd pointer to
* raw line data. May be NULL if you don't want it.
* 3 : prefix_out = destination for newly malloc'd pointer to
* comments. May be NULL if you don't want it.
* 4 : data_out = destination for newly malloc'd pointer to
* line data with comments and leading/trailing spaces
* removed, and line continuation performed. May be
* NULL if you don't want it.
* 5 : newline = Standard for newlines in the file.
* On input, set to value to use or NEWLINE_UNKNOWN.
* On output, may be changed from NEWLINE_UNKNOWN to
* actual convention in file. May be NULL if you
* don't want it.
* 6 : line_number = Line number in file. In "lines" as
* reported by a text editor, not lines containing data.
*
* Returns : JB_ERR_OK on success
* JB_ERR_MEMORY on out-of-memory
* JB_ERR_FILE on EOF.
*
*********************************************************************/
jb_err edit_read_line(FILE *fp,
char **raw_out,
char **prefix_out,
char **data_out,
int *newline,
unsigned long *line_number)
{
char *p; /* Temporary pointer */
char *linebuf; /* Line read from file */
char *linestart; /* Start of linebuf, usually first non-whitespace char */
int contflag = 0; /* Nonzero for line continuation - i.e. line ends '\' */
int is_empty = 1; /* Flag if not got any data yet */
char *raw = NULL; /* String to be stored in raw_out */
char *prefix = NULL; /* String to be stored in prefix_out */
char *data = NULL; /* String to be stored in data_out */
int scrapnewline; /* Used for (*newline) if newline==NULL */
jb_err rval = JB_ERR_OK;
assert(fp);
assert(raw_out || data_out);
assert(newline == NULL
|| *newline == NEWLINE_UNKNOWN
|| *newline == NEWLINE_UNIX
|| *newline == NEWLINE_DOS
|| *newline == NEWLINE_MAC);
if (newline == NULL)
{
scrapnewline = NEWLINE_UNKNOWN;
newline = &scrapnewline;
}
/* Set output parameters to NULL */
if (raw_out)
{
*raw_out = NULL;
}
if (prefix_out)
{
*prefix_out = NULL;
}
if (data_out)
{
*data_out = NULL;
}
/* Set string variables to new, empty strings. */
if (raw_out)
{
raw = strdup("");
if (NULL == raw)
{
return JB_ERR_MEMORY;
}
}
if (prefix_out)
{
prefix = strdup("");
if (NULL == prefix)
{
freez(raw);
return JB_ERR_MEMORY;
}
}
if (data_out)
{
data = strdup("");
if (NULL == data)
{
freez(raw);
freez(prefix);
return JB_ERR_MEMORY;
}
}
/* Main loop. Loop while we need more data & it's not EOF. */
while ( (contflag || is_empty)
&& (JB_ERR_OK == (rval = simple_read_line(fp, &linebuf, newline))))
{
if (line_number)
{
(*line_number)++;
}
if (raw)
{
string_append(&raw,linebuf);
if (string_append(&raw,NEWLINE(*newline)))
{
freez(prefix);
freez(data);
free(linebuf);
return JB_ERR_MEMORY;
}
}
/* Line continuation? Trim escape and set flag. */
p = linebuf + strlen(linebuf) - 1;
contflag = ((*linebuf != '\0') && (*p == '\\'));
if (contflag)
{
*p = '\0';
}
/* Trim leading spaces if we're at the start of the line */
linestart = linebuf;
assert(NULL != data);
if (*data == '\0')
{
/* Trim leading spaces */
while (*linestart && isspace((int)(unsigned char)*linestart))
{
linestart++;
}
}
/* Handle comment characters. */
p = linestart;
while ((p = strchr(p, '#')) != NULL)
{
/* Found a comment char.. */
if ((p != linebuf) && (*(p-1) == '\\'))
{
/* ..and it's escaped, left-shift the line over the escape. */
char *q = p - 1;
while ((*q = *(q + 1)) != '\0')
{
q++;
}
/* Now scan from just after the "#". */
}
else
{
/* Real comment. Save it... */
if (p == linestart)
{
/* Special case: Line only contains a comment, so all the
* previous whitespace is considered part of the comment.
* Undo the whitespace skipping, if any.
*/
linestart = linebuf;
p = linestart;
}
if (prefix)
{
string_append(&prefix,p);
if (string_append(&prefix, NEWLINE(*newline)))
{
freez(raw);
freez(data);
free(linebuf);
return JB_ERR_MEMORY;
}
}
/* ... and chop off the rest of the line */
*p = '\0';
}
} /* END while (there's a # character) */
/* Write to the buffer */
if (*linestart)
{
is_empty = 0;
if (data)
{
if (string_append(&data, linestart))
{
freez(raw);
freez(prefix);
free(linebuf);
return JB_ERR_MEMORY;
}
}
}
free(linebuf);
} /* END while(we need more data) */
/* Handle simple_read_line() errors - ignore EOF */
if ((rval != JB_ERR_OK) && (rval != JB_ERR_FILE))
{
freez(raw);
freez(prefix);
freez(data);
return rval;
}
if (raw ? (*raw == '\0') : is_empty)
{
/* EOF and no data there. (Definition of "data" depends on whether
* the caller cares about "raw" or just "data").
*/
freez(raw);
freez(prefix);
freez(data);
return JB_ERR_FILE;
}
else
{
/* Got at least some data */
/* Remove trailing whitespace */
chomp(data);
if (raw_out)
{
*raw_out = raw;
}
else
{
freez(raw);
}
if (prefix_out)
{
*prefix_out = prefix;
}
else
{
freez(prefix);
}
if (data_out)
{
*data_out = data;
}
else
{
freez(data);
}
return JB_ERR_OK;
}
}
/*********************************************************************
*
* Function : read_config_line
*
* Description : Read a single non-empty line from a file and return
* it. Trims comments, leading and trailing whitespace
* and respects escaping of newline and comment char.
*
* Parameters :
* 1 : fp = File to read from
* 2 : linenum = linenumber in file
* 3 : buf = Pointer to a pointer to set to the data buffer.
*
* Returns : NULL on EOF or error
* Otherwise, returns buf.
*
*********************************************************************/
char *read_config_line(FILE *fp, unsigned long *linenum, char **buf)
{
jb_err err;
err = edit_read_line(fp, NULL, NULL, buf, NULL, linenum);
if (err)
{
if (err == JB_ERR_MEMORY)
{
log_error(LOG_LEVEL_FATAL, "Out of memory loading a config file");
}
*buf = NULL;
}
return *buf;
}
#ifdef FEATURE_TRUST
/*********************************************************************
*
* Function : unload_trustfile
*
* Description : Unloads a trustfile.
*
* Parameters :
* 1 : f = the data structure associated with the trustfile.
*
* Returns : N/A
*
*********************************************************************/
static void unload_trustfile(void *f)
{
struct block_spec *cur = (struct block_spec *)f;
struct block_spec *next;
while (cur != NULL)
{
next = cur->next;
free_url_spec(cur->url);
free(cur);
cur = next;
}
}
#ifdef FEATURE_GRACEFUL_TERMINATION
/*********************************************************************
*
* Function : unload_current_trust_file
*
* Description : Unloads current trust file - reset to state at
* beginning of program.
*
* Parameters : None
*
* Returns : N/A
*
*********************************************************************/
void unload_current_trust_file(void)
{
if (current_trustfile)
{
current_trustfile->unloader = unload_trustfile;
current_trustfile = NULL;
}
}
#endif /* FEATURE_GRACEFUL_TERMINATION */
/*********************************************************************
*
* Function : load_trustfile
*
* Description : Read and parse a trustfile and add to files list.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
int load_trustfile(struct client_state *csp)
{
FILE *fp;
struct block_spec *b, *bl;
struct url_spec **tl;
char *buf = NULL;
int reject, trusted;
struct file_list *fs;
unsigned long linenum = 0;
int trusted_referrers = 0;
if (!check_file_changed(current_trustfile, csp->config->trustfile, &fs))
{
/* No need to load */
csp->tlist = current_trustfile;
return(0);
}
if (!fs)
{
goto load_trustfile_error;
}
fs->f = bl = (struct block_spec *)zalloc(sizeof(*bl));
if (bl == NULL)
{
goto load_trustfile_error;
}
if ((fp = fopen(csp->config->trustfile, "r")) == NULL)
{
goto load_trustfile_error;
}
log_error(LOG_LEVEL_INFO, "Loading trust file: %s", csp->config->trustfile);
tl = csp->config->trust_list;
while (read_config_line(fp, &linenum, &buf) != NULL)
{
trusted = 0;
reject = 1;
if (*buf == '+')
{
trusted = 1;
*buf = '~';
}
if (*buf == '~')
{
char *p;
char *q;
reject = 0;
p = buf;
q = p+1;
while ((*p++ = *q++) != '\0')
{
/* nop */
}
}
/* skip blank lines */
if (*buf == '\0')
{
freez(buf);
continue;
}
/* allocate a new node */
if ((b = zalloc(sizeof(*b))) == NULL)
{
fclose(fp);
goto load_trustfile_error;
}
/* add it to the list */
b->next = bl->next;
bl->next = b;
b->reject = reject;
/* Save the URL pattern */
if (create_url_spec(b->url, buf))
{
fclose(fp);
goto load_trustfile_error;
}
/*
* save a pointer to URL's spec in the list of trusted URL's, too
*/
if (trusted)
{
if(++trusted_referrers < MAX_TRUSTED_REFERRERS)
{
*tl++ = b->url;
}
}
freez(buf);
}
if(trusted_referrers >= MAX_TRUSTED_REFERRERS)
{
/*
* FIXME: ... after Privoxy 3.0.4 is out.
*/
log_error(LOG_LEVEL_ERROR, "Too many trusted referrers. Current limit is %d, you are using %d.\n"
" Additional trusted referrers are treated like ordinary trusted URLs.\n"
" (You can increase this limit by changing MAX_TRUSTED_REFERRERS in project.h and recompiling).",
MAX_TRUSTED_REFERRERS, trusted_referrers);
}
*tl = NULL;
fclose(fp);
/* the old one is now obsolete */
if (current_trustfile)
{
current_trustfile->unloader = unload_trustfile;
}
fs->next = files->next;
files->next = fs;
current_trustfile = fs;
csp->tlist = fs;
return(0);
load_trustfile_error:
log_error(LOG_LEVEL_FATAL, "can't load trustfile '%s': %E",
csp->config->trustfile);
freez(buf);
return(-1);
}
#endif /* def FEATURE_TRUST */
/*********************************************************************
*
* Function : unload_re_filterfile
*
* Description : Unload the re_filter list by freeing all chained
* re_filterfile specs and their data.
*
* Parameters :
* 1 : f = the data structure associated with the filterfile.
*
* Returns : N/A
*
*********************************************************************/
static void unload_re_filterfile(void *f)
{
struct re_filterfile_spec *a, *b = (struct re_filterfile_spec *)f;
while (b != NULL)
{
a = b->next;
destroy_list(b->patterns);
pcrs_free_joblist(b->joblist);
freez(b->name);
freez(b->description);
freez(b);
b = a;
}
return;
}
/*********************************************************************
*
* Function : unload_forward_spec
*
* Description : Unload the forward spec settings by freeing all
* memory referenced by members and the memory for
* the spec itself.
*
* Parameters :
* 1 : fwd = the forward spec.
*
* Returns : N/A
*
*********************************************************************/
void unload_forward_spec(struct forward_spec *fwd)
{
free_url_spec(fwd->url);
freez(fwd->gateway_host);
freez(fwd->forward_host);
free(fwd);
return;
}
#ifdef FEATURE_GRACEFUL_TERMINATION
/*********************************************************************
*
* Function : unload_current_re_filterfile
*
* Description : Unloads current re_filter file - reset to state at
* beginning of program.
*
* Parameters : None
*
* Returns : N/A
*
*********************************************************************/
void unload_current_re_filterfile(void)
{
int i;
for (i = 0; i < MAX_AF_FILES; i++)
{
if (current_re_filterfile[i])
{
current_re_filterfile[i]->unloader = unload_re_filterfile;
current_re_filterfile[i] = NULL;
}
}
}
#endif
/*********************************************************************
*
* Function : load_re_filterfiles
*
* Description : Loads all the filterfiles.
* Generate a chained list of re_filterfile_spec's from
* the "FILTER: " blocks, compiling all their substitutions
* into chained lists of pcrs_job structs.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
int load_re_filterfiles(struct client_state *csp)
{
int i;
int result;
for (i = 0; i < MAX_AF_FILES; i++)
{
if (csp->config->re_filterfile[i])
{
result = load_one_re_filterfile(csp, i);
if (result)
{
return result;
}
}
else if (current_re_filterfile[i])
{
current_re_filterfile[i]->unloader = unload_re_filterfile;
current_re_filterfile[i] = NULL;
}
}
return 0;
}
/*********************************************************************
*
* Function : load_one_re_filterfile
*
* Description : Load a re_filterfile.
* Generate a chained list of re_filterfile_spec's from
* the "FILTER: " blocks, compiling all their substitutions
* into chained lists of pcrs_job structs.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
int load_one_re_filterfile(struct client_state *csp, int fileid)
{
FILE *fp;
struct re_filterfile_spec *new_bl, *bl = NULL;
struct file_list *fs;
char *buf = NULL;
int error;
unsigned long linenum = 0;
pcrs_job *dummy, *lastjob = NULL;
/*
* No need to reload if unchanged
*/
if (!check_file_changed(current_re_filterfile[fileid], csp->config->re_filterfile[fileid], &fs))
{
csp->rlist[fileid] = current_re_filterfile[fileid];
return(0);
}
if (!fs)
{
goto load_re_filterfile_error;
}
/*
* Open the file or fail
*/
if ((fp = fopen(csp->config->re_filterfile[fileid], "r")) == NULL)
{
goto load_re_filterfile_error;
}
log_error(LOG_LEVEL_INFO, "Loading filter file: %s", csp->config->re_filterfile[fileid]);
/*
* Read line by line
*/
while (read_config_line(fp, &linenum, &buf) != NULL)
{
int new_filter = NO_NEW_FILTER;
if (strncmp(buf, "FILTER:", 7) == 0)
{
new_filter = FT_CONTENT_FILTER;
}
else if (strncmp(buf, "SERVER-HEADER-FILTER:", 21) == 0)
{
new_filter = FT_SERVER_HEADER_FILTER;
}
else if (strncmp(buf, "CLIENT-HEADER-FILTER:", 21) == 0)
{
new_filter = FT_CLIENT_HEADER_FILTER;
}
else if (strncmp(buf, "CLIENT-HEADER-TAGGER:", 21) == 0)
{
new_filter = FT_CLIENT_HEADER_TAGGER;
}
else if (strncmp(buf, "SERVER-HEADER-TAGGER:", 21) == 0)
{
new_filter = FT_SERVER_HEADER_TAGGER;
}
/*
* If this is the head of a new filter block, make it a
* re_filterfile spec of its own and chain it to the list:
*/
if (new_filter != NO_NEW_FILTER)
{
new_bl = (struct re_filterfile_spec *)zalloc(sizeof(*bl));
if (new_bl == NULL)
{
goto load_re_filterfile_error;
}
if (new_filter == FT_CONTENT_FILTER)
{
new_bl->name = chomp(buf + 7);
}
else
{
new_bl->name = chomp(buf + 21);
}
new_bl->type = new_filter;
/*
* If a filter description is available,
* encode it to HTML and save it.
*/
if (NULL != (new_bl->description = strpbrk(new_bl->name, " \t")))
{
*new_bl->description++ = '\0';
new_bl->description = html_encode(chomp(new_bl->description));
if (NULL == new_bl->description)
{
new_bl->description = strdup("Out of memory while encoding this filter's description to HTML");
}
}
else
{
new_bl->description = strdup("No description available for this filter");
}
new_bl->name = strdup(chomp(new_bl->name));
/*
* If this is the first filter block, chain it
* to the file_list rather than its (nonexistant)
* predecessor
*/
if (fs->f == NULL)
{
fs->f = new_bl;
}
else
{
assert(NULL != bl);
bl->next = new_bl;
}
bl = new_bl;
log_error(LOG_LEVEL_RE_FILTER, "Reading in filter \"%s\" (\"%s\")", bl->name, bl->description);
freez(buf);
continue;
}
/*
* Else, save the expression, make it a pcrs_job
* and chain it into the current filter's joblist
*/
if (bl != NULL)
{
error = enlist(bl->patterns, buf);
if (JB_ERR_MEMORY == error)
{
log_error(LOG_LEVEL_FATAL,
"Out of memory while enlisting re_filter job \'%s\' for filter %s.", buf, bl->name);
}
assert(JB_ERR_OK == error);
if (pcrs_job_is_dynamic(buf))
{
/*
* Dynamic pattern that might contain variables
* and has to be recompiled for every request
*/
if (bl->joblist != NULL)
{
pcrs_free_joblist(bl->joblist);
bl->joblist = NULL;
}
bl->dynamic = 1;
log_error(LOG_LEVEL_RE_FILTER,
"Adding dynamic re_filter job \'%s\' to filter %s succeeded.", buf, bl->name);
freez(buf);
continue;
}
else if (bl->dynamic)
{
/*
* A previous job was dynamic and as we
* recompile the whole filter anyway, it
* makes no sense to compile this job now.
*/
log_error(LOG_LEVEL_RE_FILTER,
"Adding static re_filter job \'%s\' to dynamic filter %s succeeded.", buf, bl->name);
freez(buf);
continue;
}
if ((dummy = pcrs_compile_command(buf, &error)) == NULL)
{
log_error(LOG_LEVEL_ERROR,
"Adding re_filter job \'%s\' to filter %s failed with error %d.", buf, bl->name, error);
freez(buf);
continue;
}
else
{
if (bl->joblist == NULL)
{
bl->joblist = dummy;
}
else if (NULL != lastjob)
{
lastjob->next = dummy;
}
lastjob = dummy;
log_error(LOG_LEVEL_RE_FILTER, "Adding re_filter job \'%s\' to filter %s succeeded.", buf, bl->name);
}
}
else
{
log_error(LOG_LEVEL_ERROR, "Ignoring job %s outside filter block in %s, line %d",
buf, csp->config->re_filterfile[fileid], linenum);
}
freez(buf);
}
fclose(fp);
/*
* Schedule the now-obsolete old data for unloading
*/
if ( NULL != current_re_filterfile[fileid] )
{
current_re_filterfile[fileid]->unloader = unload_re_filterfile;
}
/*
* Chain this file into the global list of loaded files
*/
fs->next = files->next;
files->next = fs;
current_re_filterfile[fileid] = fs;
csp->rlist[fileid] = fs;
return( 0 );
load_re_filterfile_error:
log_error(LOG_LEVEL_FATAL, "can't load re_filterfile '%s': %E",
csp->config->re_filterfile[fileid]);
return(-1);
}
/*********************************************************************
*
* Function : add_loader
*
* Description : Called from `load_config'. Called once for each input
* file found in config.
*
* Parameters :
* 1 : loader = pointer to a function that can parse and load
* the appropriate config file.
* 2 : config = The configuration_spec to add the loader to.
*
* Returns : N/A
*
*********************************************************************/
void add_loader(int (*loader)(struct client_state *),
struct configuration_spec * config)
{
int i;
for (i = 0; i < NLOADERS; i++)
{
if (config->loaders[i] == NULL)
{
config->loaders[i] = loader;
break;
}
}
}
/*********************************************************************
*
* Function : run_loader
*
* Description : Called from `load_config' and `listen_loop'. This
* function keeps the "csp" current with any file mods
* since the last loop. If a file is unchanged, the
* loader functions do NOT reload the file.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* Must be non-null. Reads: "csp->config"
* Writes: various data members.
*
* Returns : 0 => Ok, everything else is an error.
*
*********************************************************************/
int run_loader(struct client_state *csp)
{
int ret = 0;
int i;
for (i = 0; i < NLOADERS; i++)
{
if (csp->config->loaders[i] == NULL)
{
break;
}
ret |= (csp->config->loaders[i])(csp);
}
return(ret);
}
/*********************************************************************
*
* Function : file_has_been_modified
*
* Description : Helper function to check if a file has been changed
*
* Parameters :
* 1 : filename = The name of the file to check
* 2 : last_known_modification = The time of the last known
* modification
*
* Returns : TRUE if the file has been changed,
* FALSE otherwise.
*
*********************************************************************/
static int file_has_been_modified(const char *filename, time_t last_know_modification)
{
struct stat statbuf[1];
if (stat(filename, statbuf) < 0)
{
/* Error, probably file not found which counts as change. */
return 1;
}
return (last_know_modification != statbuf->st_mtime);
}
/*********************************************************************
*
* Function : any_loaded_file_changed
*
* Description : Helper function to check if any loaded file has been
* changed since the time it has been loaded.
*
* XXX: Should we cache the return value for x seconds?
*
* Parameters :
* 1 : files_to_check = List of files to check
*
* Returns : TRUE if any file has been changed,
* FALSE otherwise.
*
*********************************************************************/
int any_loaded_file_changed(const struct file_list *files_to_check)
{
const struct file_list *file_to_check = files_to_check;
while (file_to_check != NULL)
{
if (file_has_been_modified(file_to_check->filename, file_to_check->lastmodified))
{
return TRUE;
}
file_to_check = file_to_check->next;
}
return FALSE;
}
/*
Local Variables:
tab-width: 3
end:
*/
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