新增MAX_BURST_PKTLEN和MIN_BURST_PKTLEN两个环境变量控制放大包的长度范围

.gitignore

@@ -1,3 +1,6 @@
 tcpburst
 .vscode
 .DS_Store
+GPATH
+GRTAGS
+GTAGS

clean.sh

@@ -1,3 +1,3 @@
 make clean
 make distclean
-rm tcpburst clean
+rm clean

src/tcpreplay.c

@@ -1565,7 +1565,7 @@ static const u_char *find_iphdr(const u_char *pkt, size_t pktlen, const u_char *
 		return -1; 
 	}
 
-	if(pktlen > TCP_BURST_MTU){
+	if(pktlen > TCP_BURST_MTU || pktlen > options.max_burst_pkt_len || pktlen < options.min_burst_pkt_len){
 		//fprintf(stderr, "Tcpburst error! Packet too long:%d, current MTU is:%d\n", pktlen, TCP_BURST_MTU);
 		return -1;
 	}
@@ -1960,10 +1960,28 @@ init(void)
 	options.pkt_distance = 0;
 	options.driver_mode = "pcap"; /* default mode is pcap */
 	options.encap_cfg_file = NULL;
+	char *env_var = getenv("MAX_BURST_PKTLEN");
+	if(env_var != NULL)
+	{
+		options.max_burst_pkt_len = atoi(env_var);	
+	}
+	else
+	{
+		options.max_burst_pkt_len = TCP_BURST_MTU;
+	}
+	env_var = getenv("MIN_BURST_PKTLEN");
+	if(env_var != NULL)
+	{
+		options.min_burst_pkt_len = atoi(env_var);	
+	}
+	else
+	{
+		options.min_burst_pkt_len = 0;
+	}
 #endif
 
-    if (fcntl(STDERR_FILENO, F_SETFL, O_NONBLOCK) < 0)
+		if (fcntl(STDERR_FILENO, F_SETFL, O_NONBLOCK) < 0)
-        warnx("Unable to set STDERR to non-blocking: %s", strerror(errno));
+			warnx("Unable to set STDERR to non-blocking: %s", strerror(errno));
 }
 
 /**

src/tcpreplay.h

@@ -120,6 +120,8 @@ struct tcpreplay_opt_s {
 	long cpu_mask;
 
 	char *encap_cfg_file; /* <20>ײ<EFBFBD><D7B2><EFBFBD>װģʽ */
+    int max_burst_pkt_len;
+    int min_burst_pkt_len;
 #endif
 };