From 374d643acd505d83028d82a2accce1cc11a07ebc Mon Sep 17 00:00:00 2001
From: cbdev <cb@cbcdn.com>
Date: Fri, 28 Mar 2025 16:03:48 +0100
Subject: Implement configurable send delay
---
slowloris.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
(limited to 'slowloris.c')
diff --git a/slowloris.c b/slowloris.c
index 1bb5337..846afde 100644
--- a/slowloris.c
+++ b/slowloris.c
@@ -3,6 +3,24 @@
#include <dlfcn.h>
#include <netinet/tcp.h>
#include <netinet/in.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+static int silent_mode = 0;
+static unsigned send_delay = 0;
+
+char* xgetenv(const char* name){
+ char* rv = getenv(name);
+ return rv ? rv : "";
+}
+
+__attribute__ ((constructor)) void slowloris_init(){
+ silent_mode = strtoul(xgetenv("SLOWLORIS_SILENT"), NULL, 10);
+ send_delay = strtoul(xgetenv("SLOWLORIS_DELAY"), NULL, 10);
+ if(!silent_mode){
+ printf("preload-slowloris active\nDelay: %d\n", send_delay);
+ }
+}
int socket(int domain, int type, int protocol){
static int (*real_socket) (int, int, int) = NULL;
@@ -14,7 +32,11 @@ int socket(int domain, int type, int protocol){
int enable = 1;
if(domain == AF_INET && type == SOCK_STREAM){
- setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &enable, sizeof(enable));
+ if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &enable, sizeof(enable)) < 0){
+ if(!silent_mode){
+ perror("setsockopt/tcp_nodelay");
+ }
+ }
}
return fd;
}
@@ -33,6 +55,9 @@ ssize_t send(int sockfd, const void* buf, size_t len, int flags){
return -1;
}
rv += sent;
+ if(send_delay){
+ usleep(send_delay);
+ }
}
return rv;
}
--
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