From d31dcbc91d5027a3441e3c659a37bb4db84429c4 Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Sat, 21 Jan 2017 21:48:00 +0100
Subject: Add (#if 0'd) socket-to-file log code

---
 tcp.c | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/tcp.c b/tcp.c
index 65da79d..b96d894 100644
--- a/tcp.c
+++ b/tcp.c
@@ -10,6 +10,92 @@
 #include "memory.h"
 #include "tcp.h"
 
+#if 0
+#define BUFFER_LENGTH 1024
+static char recv_log_buffer[BUFFER_LENGTH],send_log_buffer[BUFFER_LENGTH];
+static int recv_log_len=0,send_log_len=0;
+static int buffered_tag=-1;
+
+static ssize_t min(ssize_t a,ssize_t b){
+	return a<b?a:b;
+}
+
+static void do_log(int tag,const char *method,const char *data,size_t len){
+	char fname[64];
+	snprintf(fname,sizeof(fname),"fd_log_%d.txt",tag);
+	FILE *f=fopen(fname,"ab");
+	if(!f)abort();
+	fprintf(f,"%s: <<",method);
+	fwrite(data,1,len,f);
+	fprintf(f,">>\n");
+	fclose(f);
+}
+
+static void flush_buf(int tag,const char *method,const char *buf,int *lenp){
+	if(*lenp>0){
+		do_log(tag,method,buf,*lenp);
+		*lenp=0;
+	}
+}
+
+static void buffer_destructor(void){
+	flush_buf(buffered_tag,"RECV",recv_log_buffer,&recv_log_len);
+	flush_buf(buffered_tag,"SEND",send_log_buffer,&send_log_len);
+}
+
+__attribute__((constructor))
+static void buffer_constructor(void){
+	signal(SIGINFO,(void(*)(int))buffer_destructor);
+	atexit(buffer_destructor);
+}
+
+static void add_to_buf(int tag,const char *method,const char *data,size_t len,char *dstbuf,int *dstlenp){
+	size_t offset=0;
+	while(*dstlenp+len-offset>BUFFER_LENGTH){
+		size_t num=min(len-offset,BUFFER_LENGTH-*dstlenp);
+		memcpy(dstbuf+*dstlenp,data+offset,num);
+		offset+=num;
+		do_log(tag,method,dstbuf,num);
+		*dstlenp=0;
+	}
+	if(len-offset>0){
+		memcpy(dstbuf+*dstlenp,data+offset,len-offset);
+		*dstlenp+=len-offset;
+	}
+}
+
+static ssize_t recv_wrapper(int socket,void *buffer,size_t length,int flags){
+	if(buffered_tag!=socket){
+		flush_buf(buffered_tag,"RECV",recv_log_buffer,&recv_log_len);
+		flush_buf(buffered_tag,"SEND",send_log_buffer,&send_log_len);
+		buffered_tag=socket;
+	}
+	ssize_t ret=recv(socket,buffer,length,flags);
+	if(ret>0){
+		flush_buf(socket,"SEND",send_log_buffer,&send_log_len);
+		add_to_buf(socket,"RECV",buffer,ret,recv_log_buffer,&recv_log_len);
+	}
+	return ret;
+}
+
+static ssize_t send_wrapper(int socket,const void *buffer,size_t length,int flags){
+	if(buffered_tag!=socket){
+		flush_buf(buffered_tag,"RECV",recv_log_buffer,&recv_log_len);
+		flush_buf(buffered_tag,"SEND",send_log_buffer,&send_log_len);
+		buffered_tag=socket;
+	}
+	ssize_t ret=send(socket,buffer,length,flags);
+	if(ret>0){
+		flush_buf(socket,"RECV",recv_log_buffer,&recv_log_len);
+		add_to_buf(socket,"SEND",buffer,ret,send_log_buffer,&send_log_len);
+	}
+	return ret;
+}
+
+#define recv recv_wrapper
+#define send send_wrapper
+#endif
+
 i64 tcp_read_line(int sock,char **buf,i64 *bufsz){
 	if(*bufsz==0||*buf==NULL){
 		*bufsz=512;
-- 
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