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--- netsed.c.orig Fri Jan 5 18:58:22 2001
+++ netsed.c Sun Aug 11 14:32:29 2002
@@ -2,6 +2,7 @@
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/wait.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
@@ -45,11 +46,11 @@
ERR("This will replace all occurences of pat1 with pat2 in matching packets.\n");
ERR("Additional parameter (count) can be used to expire rule after 'count'\n");
ERR("succesful substitutions. Eight-bit characters, including NULL and '/', can\n");
- ERR("be passed using HTTP-alike hex escape sequences (eg. %%0a%%0d). Single '%%'\n");
- ERR("can be reached by using '%%%%'. Examples:\n\n");
- ERR(" 's/anrew/mike/1' - replace 'andrew' with 'mike' (once)\n");
- ERR(" 's/anrew/mike' - replace all occurences of 'andrew' with 'mike'\n");
- ERR(" 's/anrew/mike%%00' - replace 'andrew' with 'mike\\x00' (to keep orig. size)\n");
+ ERR("be passed using HTTP-alike hex escape sequences (eg. CRLF -> %%0a%%0d).\n");
+ ERR("Single '%%' can be reached by using '%%%%'. Examples:\n\n");
+ ERR(" 's/andrew/mike/1' - replace 'andrew' with 'mike' (once)\n");
+ ERR(" 's/andrew/mike' - replace all occurences of 'andrew' with 'mike'\n");
+ ERR(" 's/andrew/mike%%00' - replace 'andrew' with 'mike\\x00' (to keep orig. size)\n");
ERR(" 's/%%%%/%%2f/20' - replace '%%' with '/' in first 20 packets\n\n");
ERR("Rules are not working on cross-packet boundaries and are evaluated from\n");
ERR("first to last not expired rule.\n");
@@ -134,8 +135,10 @@
void bind_and_listen(int tcp,int port) {
+ int on=1;
struct sockaddr_in laddr;
lsock=socket(PF_INET,tcp ? SOCK_STREAM:SOCK_DGRAM,0);
+ setsockopt(lsock, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
fcntl(lsock,F_SETFL,O_NONBLOCK);
laddr.sin_family = PF_INET;
laddr.sin_port = htons (port);
@@ -186,7 +189,6 @@
rd=read(s1,buf,sizeof(buf));
if (rd<0 && errno!=EAGAIN) return 0; // s1 not connected
if (rd>0) {
- fcntl(s2,F_SETFL,O_SYNC);
printf("[+] Caught server -> client packet.\n");
rd=sed_the_buffer(rd);
if (write(s2,b2,rd)<=0) return 0; // not able to send
@@ -195,7 +197,6 @@
rd=read(s2,buf,sizeof(buf));
if (rd<0 && errno!=EAGAIN) return 0; // s2 not connected
if (rd>0) {
- fcntl(s1,F_SETFL,O_SYNC);
printf("[+] Caught client -> server packet.\n");
rd=sed_the_buffer(rd);
if (write(s1,b2,rd)<=0) return 0; // not able to send
@@ -204,6 +205,14 @@
return 1;
}
+void sig_chld(int signo)
+{
+ pid_t pid;
+ int stat;
+ while ( (pid = waitpid(-1, &stat, WNOHANG)) > 0)
+ printf("child %d terminated\n", pid);
+ return;
+}
int main(int argc,char* argv[]) {
int i;
@@ -242,7 +251,7 @@
if (fixedhost && fixedport) printf("[+] Using fixed forwarding to %s:%s.\n",argv[3],argv[4]);
else printf("[+] Using dynamic (transparent proxy) forwarding.\n");
signal(SIGPIPE,SIG_IGN);
- signal(SIGCHLD,SIG_IGN);
+ signal(SIGCHLD,sig_chld);
// Am I bad coder?;>
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