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[mod_evasive] 302 redirect option if limit reached (fixes #2199) 

x-ref:
  "[mod_evasive] redirect if maximum connections exceeded"
  https://redmine.lighttpd.net/issues/2199
This commit is contained in:
Glenn Strauss 2016-05-12 01:11:48 -04:00
parent bd66026fc2
commit 0cd7f2dda8
1 changed files with 17 additions and 1 deletions
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18
src/mod_evasive.c
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@ -3,6 +3,7 @@
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "response.h"
#include "plugin.h"
@ -30,6 +31,7 @@
typedef struct {
unsigned short max_conns;
unsigned short silent;
buffer *location;
} plugin_config;
typedef struct {
@ -62,6 +64,8 @@ FREE_FUNC(mod_evasive_free) {
if (NULL == s) continue;
buffer_free(s->location);
free(s);
}
free(p->config_storage);
@ -79,6 +83,7 @@ SETDEFAULTS_FUNC(mod_evasive_set_defaults) {
config_values_t cv[] = {
{ "evasive.max-conns-per-ip", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "evasive.silent", NULL, T_CONFIG_BOOLEAN, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
{ "evasive.location", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
@ -91,9 +96,11 @@ SETDEFAULTS_FUNC(mod_evasive_set_defaults) {
s = calloc(1, sizeof(plugin_config));
s->max_conns = 0;
s->silent = 0;
s->location = buffer_init();
cv[0].destination = &(s->max_conns);
cv[1].destination = &(s->silent);
cv[2].destination = s->location;
p->config_storage[i] = s;
@ -113,6 +120,7 @@ static int mod_evasive_patch_connection(server *srv, connection *con, plugin_dat
PATCH(max_conns);
PATCH(silent);
PATCH(location);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
@ -130,6 +138,8 @@ static int mod_evasive_patch_connection(server *srv, connection *con, plugin_dat
PATCH(max_conns);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("evasive.silent"))) {
PATCH(silent);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("evasive.location"))) {
PATCH(location);
}
}
}
@ -190,7 +200,13 @@ URIHANDLER_FUNC(mod_evasive_uri_handler) {
"turned away. Too many connections.");
}
con->http_status = 403;
if (!buffer_is_empty(p->conf.location)) {
response_header_overwrite(srv, con, CONST_STR_LEN("Location"), CONST_BUF_LEN(p->conf.location));
con->http_status = 302;
con->file_finished = 1;
} else {
con->http_status = 403;
}
con->mode = DIRECT;
return HANDLER_FINISHED;
}