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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "httpd.h"
#include "http_config.h"
#include "http_log.h"
module referer_log_module;
static int xfer_flags = (O_WRONLY | O_APPEND | O_CREAT);
#ifdef OS2
/* OS/2 lacks support for users and groups */
static mode_t xfer_mode = (S_IREAD | S_IWRITE);
#else
static mode_t xfer_mode = (S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
#endif
typedef struct {
char *fname;
int referer_fd;
array_header *referer_ignore_list;
} referer_log_state;
static void *make_referer_log_state(pool *p, server_rec *s)
{
referer_log_state *cls =
(referer_log_state *) ap_palloc(p, sizeof(referer_log_state));
cls->fname = "";
cls->referer_fd = -1;
cls->referer_ignore_list = ap_make_array(p, 1, sizeof(char *));
return (void *) cls;
}
static const char *set_referer_log(cmd_parms *parms, void *dummy, char *arg)
{
referer_log_state *cls = ap_get_module_config(parms->server->module_config,
&referer_log_module);
cls->fname = arg;
return NULL;
}
static const char *add_referer_ignore(cmd_parms *parms, void *dummy, char *arg)
{
char **addme;
referer_log_state *cls = ap_get_module_config(parms->server->module_config,
&referer_log_module);
addme = ap_push_array(cls->referer_ignore_list);
ap_str_tolower(arg);
*addme = arg;
return NULL;
}
static const command_rec referer_log_cmds[] =
{
{"RefererLog", set_referer_log, NULL, RSRC_CONF, TAKE1,
"the filename of the referer log"},
{"RefererIgnore", add_referer_ignore, NULL, RSRC_CONF, ITERATE,
"referer hostnames to ignore"},
{NULL}
};
static void open_referer_log(server_rec *s, pool *p)
{
referer_log_state *cls = ap_get_module_config(s->module_config,
&referer_log_module);
char *fname = ap_server_root_relative(p, cls->fname);
if (cls->referer_fd > 0)
return; /* virtual log shared w/main server */
if (*cls->fname == '|') {
piped_log *pl;
pl = ap_open_piped_log(p, cls->fname + 1);
if (pl == NULL) {
ap_log_error(APLOG_MARK, APLOG_ERR, s,
"couldn't spawn referer log pipe");
exit(1);
}
cls->referer_fd = ap_piped_log_write_fd(pl);
}
else if (*cls->fname != '\0') {
if ((cls->referer_fd = ap_popenf_ex(p, fname, xfer_flags, xfer_mode, 1))
< 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, s,
"could not open referer log file %s.", fname);
exit(1);
}
}
}
static void init_referer_log(server_rec *s, pool *p)
{
for (; s; s = s->next)
open_referer_log(s, p);
}
static int referer_log_transaction(request_rec *orig)
{
char **ptrptr, **ptrptr2;
referer_log_state *cls = ap_get_module_config(orig->server->module_config,
&referer_log_module);
char *str;
const char *referer;
char *referertest;
request_rec *r;
if (cls->referer_fd < 0)
return OK;
for (r = orig; r->next; r = r->next)
continue;
if (*cls->fname == '\0') /* Don't log referer */
return DECLINED;
referer = ap_table_get(orig->headers_in, "Referer");
if (referer != NULL) {
referertest = ap_pstrdup(orig->pool, referer);
ap_str_tolower(referertest);
/* The following is an upsetting mess of pointers, I'm sorry
Anyone with the motiviation and/or the time should feel free
to make this cleaner... */
ptrptr2 = (char **) (cls->referer_ignore_list->elts +
(cls->referer_ignore_list->nelts *
cls->referer_ignore_list->elt_size));
/* Go through each element of the ignore list and compare it to the
referer_host. If we get a match, return without logging */
for (ptrptr = (char **) cls->referer_ignore_list->elts;
ptrptr < ptrptr2;
ptrptr = (char **) ((char *) ptrptr + cls->referer_ignore_list->elt_size)) {
if (strstr(referertest, *ptrptr))
return OK;
}
str = ap_pstrcat(orig->pool, referer, " -> ", r->uri, "\n", NULL);
write(cls->referer_fd, str, strlen(str));
}
return OK;
}
module referer_log_module =
{
STANDARD_MODULE_STUFF,
init_referer_log, /* initializer */
NULL, /* create per-dir config */
NULL, /* merge per-dir config */
make_referer_log_state, /* server config */
NULL, /* merge server config */
referer_log_cmds, /* command table */
NULL, /* handlers */
NULL, /* filename translation */
NULL, /* check_user_id */
NULL, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
NULL, /* fixups */
referer_log_transaction, /* logger */
NULL, /* header parser */
NULL, /* child_init */
NULL, /* child_exit */
NULL /* post read-request */
};
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