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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <src/config.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <parc/assert/parc_Assert.h>
#include <parc/algol/parc_Memory.h>
#include <parc/algol/parc_Network.h>
#include <src/config/controlSetDebug.h>
#include <src/core/dispatcher.h>
#include <src/core/forwarder.h>
#include <src/utils/commands.h>
#include <src/utils/utils.h>
static CommandReturn _controlSetStrategy_Execute(CommandParser *parser,
CommandOps *ops,
PARCList *args);
static CommandReturn _controlSetStrategy_HelpExecute(CommandParser *parser,
CommandOps *ops,
PARCList *args);
static const char *_commandSetStrategy = "set strategy";
static const char *_commandSetStrategyHelp = "help set strategy";
static const char *_commandSetStrategyOptions[LAST_STRATEGY_VALUE] = {
"loadbalancer",
"random",
"random_per_dash_segment",
"loadbalancer_with_delay",
"loadbalancer_by_rate",
"loadbalancer_best_route"};
// ====================================================
CommandOps *controlSetStrategy_Create(ControlState *state) {
return commandOps_Create(state, _commandSetStrategy, NULL,
_controlSetStrategy_Execute, commandOps_Destroy);
}
CommandOps *controlSetStrategy_HelpCreate(ControlState *state) {
return commandOps_Create(state, _commandSetStrategyHelp, NULL,
_controlSetStrategy_HelpExecute, commandOps_Destroy);
}
// ====================================================
strategy_type _validStrategy(const char *strategy) {
strategy_type validStrategy = LAST_STRATEGY_VALUE;
for (int i = 0; i < LAST_STRATEGY_VALUE; i++) {
if (strcmp(_commandSetStrategyOptions[i], strategy) == 0) {
validStrategy = i;
break;
}
}
return validStrategy;
}
static CommandReturn _controlSetStrategy_HelpExecute(CommandParser *parser,
CommandOps *ops,
PARCList *args) {
printf("set strategy <prefix> <strategy>\n");
printf("prefix: ipv4/ipv6 address (ex: 1234::/64)\n");
printf("strategy: strategy identifier\n");
printf("available strategies:\n");
printf(" random\n");
printf(" loadbalancer\n");
printf(" random_per_dash_segment\n");
printf(" loadbalancer_with_delay\n");
printf("\n");
return CommandReturn_Success;
}
static CommandReturn _controlSetStrategy_Execute(CommandParser *parser,
CommandOps *ops,
PARCList *args) {
ControlState *state = ops->closure;
if (parcList_Size(args) != 4) {
_controlSetStrategy_HelpExecute(parser, ops, args);
return CommandReturn_Failure;
}
if (((strcmp(parcList_GetAtIndex(args, 0), "set") != 0) ||
(strcmp(parcList_GetAtIndex(args, 1), "strategy") != 0))) {
_controlSetStrategy_HelpExecute(parser, ops, args);
return CommandReturn_Failure;
}
const char *prefixStr = parcList_GetAtIndex(args, 2);
char *addr = (char *)malloc(sizeof(char) * (strlen(prefixStr) + 1));
// separate address and len
char *slash;
uint32_t len = UINT32_MAX;
strcpy(addr, prefixStr);
slash = strrchr(addr, '/');
if (slash != NULL) {
len = atoi(slash + 1);
*slash = '\0';
}
if (len == 0) {
printf("ERROR: a prefix can not be of length 0\n");
free(addr);
return CommandReturn_Failure;
}
// allocate command payload
set_strategy_command *setStrategyCommand =
parcMemory_AllocateAndClear(sizeof(set_strategy_command));
// check and set IP address
if (inet_pton(AF_INET, addr, &setStrategyCommand->address.ipv4) == 1) {
if (len == UINT32_MAX) {
printf("Netmask not specified: set to 32 by default\n");
len = 32;
} else if (len > 32) {
printf("ERROR: exceeded INET mask length, max=32\n");
parcMemory_Deallocate(&setStrategyCommand);
free(addr);
return CommandReturn_Failure;
}
setStrategyCommand->addressType = ADDR_INET;
} else if (inet_pton(AF_INET6, addr, &setStrategyCommand->address.ipv6) ==
1) {
if (len == UINT32_MAX) {
printf("Netmask not specified: set to 128 by default\n");
len = 128;
} else if (len > 128) {
printf("ERROR: exceeded INET6 mask length, max=128\n");
parcMemory_Deallocate(&setStrategyCommand);
free(addr);
return CommandReturn_Failure;
}
setStrategyCommand->addressType = ADDR_INET6;
} else {
printf("Error: %s is not a valid network address \n", addr);
parcMemory_Deallocate(&setStrategyCommand);
return CommandReturn_Failure;
}
const char *strategyStr = parcList_GetAtIndex(args, 3);
// check valid strategy
strategy_type strategy;
if ((strategy = _validStrategy(strategyStr)) == LAST_STRATEGY_VALUE) {
printf("Error: invalid strategy \n");
parcMemory_Deallocate(&setStrategyCommand);
_controlSetStrategy_HelpExecute(parser, ops, args);
free(addr);
return CommandReturn_Failure;
}
free(addr);
// Fill remaining payload fields
setStrategyCommand->len = len;
setStrategyCommand->strategyType = strategy;
// send message and receive response
struct iovec *response = utils_SendRequest(
state, SET_STRATEGY, setStrategyCommand, sizeof(set_strategy_command));
if (!response) { // get NULL pointer
return CommandReturn_Failure;
}
parcMemory_Deallocate(&response); // free iovec pointer
return CommandReturn_Success;
}
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