Add test case: inject IPv4 based TCP payload packet after recv C2S first payload

src/packet/packet_utils.cpp

@@ -2,6 +2,10 @@
 #include <assert.h>
 #include <string.h>
 
+#include "udp_utils.h"
+#include "tcp_utils.h"
+#include "ipv4_utils.h"
+#include "ipv6_utils.h"
 #include "packet_priv.h"
 #include "marsio.h"
 
@@ -401,3 +405,65 @@ void packet_append_sid_list(struct packet *pkt, const struct sid_list *list)
         PACKET_LOG_WARN("packet origin is not marsio, failed to append sid list");
     }
 }
+
+int packet_get_fingerprint(const struct packet *pkt, char *buff, int size)
+{
+    int used = 0;
+    char tuple_str[256] = {0};
+
+    struct tuple6 tuple;
+    const struct tcphdr *tcp_hdr = NULL;
+    const struct udphdr *udp_hdr = NULL;
+    const struct ip *ipv4_hdr = NULL;
+    const struct ip6_hdr *ipv6_hdr = NULL;
+    const struct packet_layer *l3_layer = NULL;
+    const struct packet_layer *l4_layer = NULL;
+    memset(buff, 0, size);
+
+    if (packet_get_innermost_tuple6(pkt, &tuple) != 0)
+    {
+        return used;
+    }
+    tuple6_to_str(&tuple, tuple_str, sizeof(tuple_str));
+    used += snprintf(buff + used, size - used, "tuple6: %s, ", tuple_str);
+
+    l3_layer = packet_get_innermost_layer(pkt, LAYER_TYPE_L3);
+    if (l3_layer == NULL || l3_layer->hdr_ptr == NULL)
+    {
+        return used;
+    }
+    switch (l3_layer->type)
+    {
+    case LAYER_TYPE_IPV4:
+        ipv4_hdr = (const struct ip *)l3_layer->hdr_ptr;
+        used += snprintf(buff + used, size - used, "ip_ttl: %u, ip_id: %u, ", ipv4_hdr_get_ttl(ipv4_hdr), ipv4_hdr_get_ipid(ipv4_hdr));
+        break;
+    case LAYER_TYPE_IPV6:
+        ipv6_hdr = (const struct ip6_hdr *)l3_layer->hdr_ptr;
+        used += snprintf(buff + used, size - used, "ip6_hlim: %u, ", ipv6_hdr_get_hop_limit(ipv6_hdr));
+        break;
+    default:
+        break;
+    }
+
+    l4_layer = packet_get_innermost_layer(pkt, LAYER_TYPE_L4);
+    if (l4_layer == NULL || l4_layer->hdr_ptr == NULL)
+    {
+        return used;
+    }
+    switch (l4_layer->type)
+    {
+    case LAYER_TYPE_TCP:
+        tcp_hdr = (const struct tcphdr *)l4_layer->hdr_ptr;
+        used += snprintf(buff + used, size - used, "tcp_seq: %u, tcp_ack: %u, tcp_checksum: %u, ", tcp_hdr_get_seq(tcp_hdr), tcp_hdr_get_ack(tcp_hdr), tcp_hdr_get_checksum(tcp_hdr));
+        break;
+    case LAYER_TYPE_UDP:
+        udp_hdr = (const struct udphdr *)l4_layer->hdr_ptr;
+        used += snprintf(buff + used, size - used, "udp_checksum: %u, ", udp_hdr_get_checksum(udp_hdr));
+        break;
+    default:
+        break;
+    }
+
+    return used;
+}