TSG-13629 tsg-service-chaining-engine解封装从SAPP收到的控制报文

common/src/ctrl_packet.cpp

@@ -1,7 +1,27 @@
 #include <string.h>
+#include <cjson/cJSON.h>
 
+#include "log.h"
+#include "utils.h"
 #include "ctrl_packet.h"
 
+static const char *session_state_to_string(enum session_state state)
+{
+    switch (state)
+    {
+    case SESSION_STATE_OPENING:
+        return "opening";
+    case SESSION_STATE_CLONING:
+        return "closing";
+    case SESSION_STATE_ACTIVE:
+        return "active";
+    case SESSION_STATE_RESETALL:
+        return "resetall";
+    default:
+        return "unknown";
+    }
+}
+
 void ctrl_packet_parser_init(struct ctrl_pkt_parser *handler)
 {
     memset(handler, 0, sizeof(struct ctrl_pkt_parser));
@@ -9,7 +29,141 @@ void ctrl_packet_parser_init(struct ctrl_pkt_parser *handler)
 
 // return  0 : success
 // return -1 : error
-int ctrl_packet_parser_parse(struct ctrl_pkt_parser *handler, const void *data, size_t length)
+int ctrl_packet_parser_parse(struct ctrl_pkt_parser *handler, const char *data, size_t length)
 {
+    int iter = 0;
+    cJSON *item = NULL;
+    cJSON *elem = NULL;
+    cJSON *json = NULL;
+
+    json = cJSON_Parse(data);
+    if (json == NULL)
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid json format) %s", LOG_TAG_CTRLPKT, data);
+        return -1;
+    }
+
+    // tsync
+    item = cJSON_GetObjectItem(json, "tsync");
+    if (!item || !cJSON_IsString(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid tsync format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+    memcpy(handler->tsync, item->valuestring, MIN(sizeof(handler->tsync), strlen(item->valuestring)));
+
+    // session_id
+    item = cJSON_GetObjectItem(json, "session_id");
+    if (!item || !cJSON_IsNumber(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid session_id format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+    handler->session_id = item->valueint;
+
+    // state
+    item = cJSON_GetObjectItem(json, "state");
+    if (!item || !cJSON_IsString(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid state format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+
+    if (strcasecmp(item->valuestring, "opening") == 0)
+    {
+        handler->state = SESSION_STATE_OPENING;
+    }
+    else if (strcasecmp(item->valuestring, "active") == 0)
+    {
+        handler->state = SESSION_STATE_ACTIVE;
+    }
+    else if (strcasecmp(item->valuestring, "closing") == 0)
+    {
+        handler->state = SESSION_STATE_CLONING;
+    }
+    else if (strcasecmp(item->valuestring, "resetall") == 0)
+    {
+        handler->state = SESSION_STATE_RESETALL;
+    }
+    else
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid state value) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+
+    if (handler->state != SESSION_STATE_ACTIVE)
+    {
+        goto success_out;
+    }
+
+    // method
+    item = cJSON_GetObjectItem(json, "method");
+    if (!item || !cJSON_IsString(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid method format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+    memcpy(handler->method, item->valuestring, MIN(sizeof(handler->method), strlen(item->valuestring)));
+    if (strcasecmp(item->valuestring, "policy_update") != 0)
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid method value) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+
+    // params
+    item = cJSON_GetObjectItem(json, "params");
+    if (!item || !cJSON_IsObject(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid params format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+
+    item = cJSON_GetObjectItem(item, "service_chaining");
+    if (!item || !cJSON_IsArray(item) || !cJSON_GetArraySize(item))
+    {
+        LOG_ERROR("%s: unexpected control packet: (invalid service_chaining format) %s", LOG_TAG_CTRLPKT, data);
+        goto error_out;
+    }
+
+    handler->policy_id_num = MIN(cJSON_GetArraySize(item), (int)(sizeof(handler->policy_ids) / sizeof(handler->policy_ids[0])));
+    cJSON_ArrayForEach(elem, item)
+    {
+        if (!cJSON_IsNumber(elem))
+        {
+            LOG_ERROR("%s: unexpected control packet: (invalid service_chaining value) %s", LOG_TAG_POLICY, data);
+            continue;
+        }
+        handler->policy_ids[iter] = elem->valueint;
+        iter++;
+
+        if (iter == handler->policy_id_num)
+        {
+            break;
+        }
+    }
+
+success_out:
+    cJSON_Delete(json);
     return 0;
-}
+
+error_out:
+    cJSON_Delete(json);
+    return -1;
+}
+
+void ctrl_packet_parser_dump(struct ctrl_pkt_parser *handler)
+{
+    if (handler)
+    {
+        LOG_INFO("%s: tsync           : %s", LOG_TAG_POLICY, handler->tsync);
+        LOG_INFO("%s: session_id      : %lu", LOG_TAG_POLICY, handler->session_id);
+        LOG_INFO("%s: state           : %s", LOG_TAG_POLICY, session_state_to_string(handler->state));
+        LOG_INFO("%s: method          : %s", LOG_TAG_POLICY, handler->method);
+        LOG_INFO("%s: policy_id_num   : %d", LOG_TAG_POLICY, handler->policy_id_num);
+
+        for (int i = 0; i < handler->policy_id_num; i++)
+        {
+            LOG_INFO("%s: policy_ids[%03d] : %i", LOG_TAG_POLICY, i, handler->policy_ids[i]);
+        }
+    }
+}