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03d144a452
Replaces Redis => Redict API References: https://codeberg.org/redict/redict/issues/21 Signed-off-by: Drew DeVault <sir@cmpwn.com>
258 lines
9.0 KiB
C
258 lines
9.0 KiB
C
// SPDX-FileCopyrightText: 2024 Redict Contributors
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// SPDX-FileCopyrightText: 2024 Salvatore Sanfilippo <antirez at gmail dot com>
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//
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// SPDX-License-Identifier: BSD-3-Clause
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// SPDX-License-Identifier: LGPL-3.0-only
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#include "redictmodule.h"
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#include <string.h>
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#include <strings.h>
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static RedictModuleString *log_key_name;
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static const char log_command_name[] = "commandfilter.log";
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static const char ping_command_name[] = "commandfilter.ping";
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static const char retained_command_name[] = "commandfilter.retained";
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static const char unregister_command_name[] = "commandfilter.unregister";
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static const char unfiltered_clientid_name[] = "unfilter_clientid";
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static int in_log_command = 0;
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unsigned long long unfiltered_clientid = 0;
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static RedictModuleCommandFilter *filter, *filter1;
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static RedictModuleString *retained;
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int CommandFilter_UnregisterCommand(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
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{
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(void) argc;
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(void) argv;
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RedictModule_ReplyWithLongLong(ctx,
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RedictModule_UnregisterCommandFilter(ctx, filter));
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return REDICTMODULE_OK;
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}
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int CommandFilter_PingCommand(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
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{
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(void) argc;
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(void) argv;
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RedictModuleCallReply *reply = RedictModule_Call(ctx, "ping", "c", "@log");
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if (reply) {
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RedictModule_ReplyWithCallReply(ctx, reply);
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RedictModule_FreeCallReply(reply);
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} else {
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RedictModule_ReplyWithSimpleString(ctx, "Unknown command or invalid arguments");
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}
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return REDICTMODULE_OK;
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}
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int CommandFilter_Retained(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
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{
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(void) argc;
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(void) argv;
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if (retained) {
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RedictModule_ReplyWithString(ctx, retained);
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} else {
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RedictModule_ReplyWithNull(ctx);
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}
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return REDICTMODULE_OK;
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}
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int CommandFilter_LogCommand(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
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{
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RedictModuleString *s = RedictModule_CreateString(ctx, "", 0);
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int i;
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for (i = 1; i < argc; i++) {
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size_t arglen;
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const char *arg = RedictModule_StringPtrLen(argv[i], &arglen);
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if (i > 1) RedictModule_StringAppendBuffer(ctx, s, " ", 1);
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RedictModule_StringAppendBuffer(ctx, s, arg, arglen);
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}
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RedictModuleKey *log = RedictModule_OpenKey(ctx, log_key_name, REDICTMODULE_WRITE|REDICTMODULE_READ);
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RedictModule_ListPush(log, REDICTMODULE_LIST_HEAD, s);
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RedictModule_CloseKey(log);
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RedictModule_FreeString(ctx, s);
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in_log_command = 1;
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size_t cmdlen;
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const char *cmdname = RedictModule_StringPtrLen(argv[1], &cmdlen);
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RedictModuleCallReply *reply = RedictModule_Call(ctx, cmdname, "v", &argv[2], argc - 2);
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if (reply) {
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RedictModule_ReplyWithCallReply(ctx, reply);
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RedictModule_FreeCallReply(reply);
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} else {
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RedictModule_ReplyWithSimpleString(ctx, "Unknown command or invalid arguments");
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}
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in_log_command = 0;
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return REDICTMODULE_OK;
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}
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int CommandFilter_UnfilteredClientId(RedictModuleCtx *ctx, RedictModuleString **argv, int argc)
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{
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if (argc < 2)
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return RedictModule_WrongArity(ctx);
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long long id;
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if (RedictModule_StringToLongLong(argv[1], &id) != REDICTMODULE_OK) {
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RedictModule_ReplyWithError(ctx, "invalid client id");
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return REDICTMODULE_OK;
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}
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if (id < 0) {
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RedictModule_ReplyWithError(ctx, "invalid client id");
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return REDICTMODULE_OK;
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}
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unfiltered_clientid = id;
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RedictModule_ReplyWithSimpleString(ctx, "OK");
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return REDICTMODULE_OK;
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}
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/* Filter to protect against Bug #11894 reappearing
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*
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* ensures that the filter is only run the first time through, and not on reprocessing
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*/
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void CommandFilter_BlmoveSwap(RedictModuleCommandFilterCtx *filter)
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{
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if (RedictModule_CommandFilterArgsCount(filter) != 6)
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return;
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RedictModuleString *arg = RedictModule_CommandFilterArgGet(filter, 0);
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size_t arg_len;
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const char *arg_str = RedictModule_StringPtrLen(arg, &arg_len);
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if (arg_len != 6 || strncmp(arg_str, "blmove", 6))
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return;
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/*
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* Swapping directional args (right/left) from source and destination.
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* need to hold here, can't push into the ArgReplace func, as it will cause other to freed -> use after free
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*/
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RedictModuleString *dir1 = RedictModule_HoldString(NULL, RedictModule_CommandFilterArgGet(filter, 3));
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RedictModuleString *dir2 = RedictModule_HoldString(NULL, RedictModule_CommandFilterArgGet(filter, 4));
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RedictModule_CommandFilterArgReplace(filter, 3, dir2);
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RedictModule_CommandFilterArgReplace(filter, 4, dir1);
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}
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void CommandFilter_CommandFilter(RedictModuleCommandFilterCtx *filter)
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{
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unsigned long long id = RedictModule_CommandFilterGetClientId(filter);
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if (id == unfiltered_clientid) return;
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if (in_log_command) return; /* don't process our own RM_Call() from CommandFilter_LogCommand() */
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/* Fun manipulations:
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* - Remove @delme
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* - Replace @replaceme
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* - Append @insertbefore or @insertafter
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* - Prefix with Log command if @log encountered
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*/
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int log = 0;
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int pos = 0;
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while (pos < RedictModule_CommandFilterArgsCount(filter)) {
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const RedictModuleString *arg = RedictModule_CommandFilterArgGet(filter, pos);
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size_t arg_len;
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const char *arg_str = RedictModule_StringPtrLen(arg, &arg_len);
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if (arg_len == 6 && !memcmp(arg_str, "@delme", 6)) {
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RedictModule_CommandFilterArgDelete(filter, pos);
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continue;
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}
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if (arg_len == 10 && !memcmp(arg_str, "@replaceme", 10)) {
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RedictModule_CommandFilterArgReplace(filter, pos,
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RedictModule_CreateString(NULL, "--replaced--", 12));
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} else if (arg_len == 13 && !memcmp(arg_str, "@insertbefore", 13)) {
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RedictModule_CommandFilterArgInsert(filter, pos,
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RedictModule_CreateString(NULL, "--inserted-before--", 19));
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pos++;
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} else if (arg_len == 12 && !memcmp(arg_str, "@insertafter", 12)) {
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RedictModule_CommandFilterArgInsert(filter, pos + 1,
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RedictModule_CreateString(NULL, "--inserted-after--", 18));
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pos++;
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} else if (arg_len == 7 && !memcmp(arg_str, "@retain", 7)) {
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if (retained) RedictModule_FreeString(NULL, retained);
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retained = RedictModule_CommandFilterArgGet(filter, pos + 1);
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RedictModule_RetainString(NULL, retained);
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pos++;
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} else if (arg_len == 4 && !memcmp(arg_str, "@log", 4)) {
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log = 1;
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}
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pos++;
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}
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if (log) RedictModule_CommandFilterArgInsert(filter, 0,
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RedictModule_CreateString(NULL, log_command_name, sizeof(log_command_name)-1));
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}
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int RedictModule_OnLoad(RedictModuleCtx *ctx, RedictModuleString **argv, int argc) {
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if (RedictModule_Init(ctx,"commandfilter",1,REDICTMODULE_APIVER_1)
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== REDICTMODULE_ERR) return REDICTMODULE_ERR;
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if (argc != 2 && argc != 3) {
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RedictModule_Log(ctx, "warning", "Log key name not specified");
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return REDICTMODULE_ERR;
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}
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long long noself = 0;
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log_key_name = RedictModule_CreateStringFromString(ctx, argv[0]);
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RedictModule_StringToLongLong(argv[1], &noself);
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retained = NULL;
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if (RedictModule_CreateCommand(ctx,log_command_name,
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CommandFilter_LogCommand,"write deny-oom",1,1,1) == REDICTMODULE_ERR)
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return REDICTMODULE_ERR;
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if (RedictModule_CreateCommand(ctx,ping_command_name,
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CommandFilter_PingCommand,"deny-oom",1,1,1) == REDICTMODULE_ERR)
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return REDICTMODULE_ERR;
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if (RedictModule_CreateCommand(ctx,retained_command_name,
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CommandFilter_Retained,"readonly",1,1,1) == REDICTMODULE_ERR)
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return REDICTMODULE_ERR;
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if (RedictModule_CreateCommand(ctx,unregister_command_name,
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CommandFilter_UnregisterCommand,"write deny-oom",1,1,1) == REDICTMODULE_ERR)
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return REDICTMODULE_ERR;
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if (RedictModule_CreateCommand(ctx, unfiltered_clientid_name,
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CommandFilter_UnfilteredClientId, "admin", 1,1,1) == REDICTMODULE_ERR)
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return REDICTMODULE_ERR;
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if ((filter = RedictModule_RegisterCommandFilter(ctx, CommandFilter_CommandFilter,
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noself ? REDICTMODULE_CMDFILTER_NOSELF : 0))
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== NULL) return REDICTMODULE_ERR;
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if ((filter1 = RedictModule_RegisterCommandFilter(ctx, CommandFilter_BlmoveSwap, 0)) == NULL)
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return REDICTMODULE_ERR;
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if (argc == 3) {
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const char *ptr = RedictModule_StringPtrLen(argv[2], NULL);
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if (!strcasecmp(ptr, "noload")) {
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/* This is a hint that we return ERR at the last moment of OnLoad. */
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RedictModule_FreeString(ctx, log_key_name);
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if (retained) RedictModule_FreeString(NULL, retained);
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return REDICTMODULE_ERR;
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}
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}
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return REDICTMODULE_OK;
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}
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int RedictModule_OnUnload(RedictModuleCtx *ctx) {
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RedictModule_FreeString(ctx, log_key_name);
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if (retained) RedictModule_FreeString(NULL, retained);
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return REDICTMODULE_OK;
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}
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