Add the files

3 files changed, 177 insertions, 0 deletions

diff --git a/src/modules/dns/dns.c b/src/modules/dns/dns.c
new file mode 100644
index 0000000..d7c90c4
--- /dev/null
+++ b/src/modules/dns/dns.c
@@ -0,0 +1,148 @@
+#include "common/printing.h"
+#include "common/jsonconfig.h"
+#include "common/strutil.h"
+#include "detection/dns/dns.h"
+#include "modules/dns/dns.h"
+
+bool ffPrintDNS(FFDNSOptions* options) {
+    FF_LIST_AUTO_DESTROY result = ffListCreate();
+
+    const char* error = ffDetectDNS(options, &result);
+
+    if (error) {
+        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "%s", error);
+        return false;
+    }
+
+    if (result.length == 0) {
+        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "NO DNS servers detected");
+        return false;
+    }
+
+    FF_STRBUF_AUTO_DESTROY buf = ffStrbufCreate();
+    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
+        if (!ffStrbufContainC(item, '.')) {
+            continue; // IPv4
+        }
+        if (buf.length) {
+            ffStrbufAppendC(&buf, ' ');
+        }
+        ffStrbufAppend(&buf, item);
+    }
+    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
+        if (!ffStrbufContainC(item, ':')) {
+            continue; // IPv6
+        }
+        if (buf.length) {
+            ffStrbufAppendC(&buf, ' ');
+        }
+        ffStrbufAppend(&buf, item);
+    }
+
+    if (options->moduleArgs.outputFormat.length == 0) {
+        ffPrintLogoAndKey(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT);
+
+        ffStrbufPutTo(&buf, stdout);
+    } else {
+        FF_PRINT_FORMAT_CHECKED(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, ((FFformatarg[]) {
+                                                                                                        FF_ARG(buf, "result"),
+                                                                                                    }));
+    }
+
+    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
+        ffStrbufDestroy(item);
+    }
+
+    return true;
+}
+
+void ffParseDNSJsonObject(FFDNSOptions* options, yyjson_val* module) {
+    yyjson_val *key, *val;
+    size_t idx, max;
+    yyjson_obj_foreach (module, idx, max, key, val) {
+        if (ffJsonConfigParseModuleArgs(key, val, &options->moduleArgs)) {
+            continue;
+        }
+
+        if (unsafe_yyjson_equals_str(key, "showType")) {
+            int value;
+            const char* error = ffJsonConfigParseEnum(val, &value, (FFKeyValuePair[]) {
+                                                                       { "both", FF_DNS_TYPE_BOTH },
+                                                                       { "ipv4", FF_DNS_TYPE_IPV4_BIT },
+                                                                       { "ipv6", FF_DNS_TYPE_IPV6_BIT },
+                                                                       {},
+                                                                   });
+            if (error) {
+                ffPrintError(FF_DNS_MODULE_NAME, 0, NULL, FF_PRINT_TYPE_NO_CUSTOM_KEY, "Invalid %s value: %s", unsafe_yyjson_get_str(key), error);
+            } else {
+                options->showType = (FFDNSShowType) value;
+            }
+            continue;
+        }
+
+        ffPrintError(FF_DNS_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "Unknown JSON key %s", unsafe_yyjson_get_str(key));
+    }
+}
+
+void ffGenerateDNSJsonConfig(FFDNSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
+    ffJsonConfigGenerateModuleArgsConfig(doc, module, &options->moduleArgs);
+
+    switch ((uint8_t) options->showType) {
+        case FF_DNS_TYPE_IPV4_BIT:
+            yyjson_mut_obj_add_str(doc, module, "showType", "ipv4");
+            break;
+        case FF_DNS_TYPE_IPV6_BIT:
+            yyjson_mut_obj_add_str(doc, module, "showType", "ipv6");
+            break;
+        case FF_DNS_TYPE_BOTH:
+            yyjson_mut_obj_add_str(doc, module, "showType", "both");
+            break;
+    }
+}
+
+bool ffGenerateDNSJsonResult(FFDNSOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
+    FF_LIST_AUTO_DESTROY result = ffListCreate();
+
+    const char* error = ffDetectDNS(options, &result);
+
+    if (error) {
+        yyjson_mut_obj_add_str(doc, module, "error", error);
+        return false;
+    }
+
+    yyjson_mut_val* arr = yyjson_mut_obj_add_arr(doc, module, "result");
+
+    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
+        yyjson_mut_arr_add_strbuf(doc, arr, item);
+    }
+
+    FF_LIST_FOR_EACH (FFstrbuf, item, result) {
+        ffStrbufDestroy(item);
+    }
+
+    return true;
+}
+
+void ffInitDNSOptions(FFDNSOptions* options) {
+    ffOptionInitModuleArg(&options->moduleArgs, "󰇖");
+
+    options->showType = FF_DNS_TYPE_BOTH;
+}
+
+void ffDestroyDNSOptions(FFDNSOptions* options) {
+    ffOptionDestroyModuleArg(&options->moduleArgs);
+}
+
+FFModuleBaseInfo ffDNSModuleInfo = {
+    .name = FF_DNS_MODULE_NAME,
+    .description = "Print configured DNS servers",
+    .initOptions = (void*) ffInitDNSOptions,
+    .destroyOptions = (void*) ffDestroyDNSOptions,
+    .parseJsonObject = (void*) ffParseDNSJsonObject,
+    .printModule = (void*) ffPrintDNS,
+    .generateJsonResult = (void*) ffGenerateDNSJsonResult,
+    .generateJsonConfig = (void*) ffGenerateDNSJsonConfig,
+    .formatArgs = FF_FORMAT_ARG_LIST(((FFModuleFormatArg[]) {
+        { "DNS result", "result" },
+    }))
+};
diff --git a/src/modules/dns/dns.h b/src/modules/dns/dns.h
new file mode 100644
index 0000000..aec4e85
--- /dev/null
+++ b/src/modules/dns/dns.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "option.h"
+
+#define FF_DNS_MODULE_NAME "DNS"
+
+bool ffPrintDNS(FFDNSOptions* options);
+void ffInitDNSOptions(FFDNSOptions* options);
+void ffDestroyDNSOptions(FFDNSOptions* options);
+
+extern FFModuleBaseInfo ffDNSModuleInfo;
diff --git a/src/modules/dns/option.h b/src/modules/dns/option.h
new file mode 100644
index 0000000..e20bbec
--- /dev/null
+++ b/src/modules/dns/option.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include "common/option.h"
+
+typedef enum FF_A_PACKED FFDNSShowType {
+    FF_DNS_TYPE_IPV4_BIT = 1,
+    FF_DNS_TYPE_IPV6_BIT = 2,
+    FF_DNS_TYPE_BOTH = FF_DNS_TYPE_IPV4_BIT | FF_DNS_TYPE_IPV6_BIT,
+    FF_DNS_TYPE_FORCE_UNSIGNED = UINT8_MAX,
+} FFDNSShowType;
+
+typedef struct FFDNSOptions {
+    FFModuleArgs moduleArgs;
+
+    FFDNSShowType showType;
+} FFDNSOptions;
+
+static_assert(sizeof(FFDNSOptions) <= FF_OPTION_MAX_SIZE, "FFDNSOptions size exceeds maximum allowed size");