ncd: modules: add netmask

blog_channels.txt

@@ -117,3 +117,4 @@ ncd_arithmetic 4
 ncd_parse 4
 ncd_valuemetic 4
 ncd_file 4
+ncd_netmask 4

generated/blog_channel_ncd_netmask.h

@@ -0,0 +1,4 @@
+#ifdef BLOG_CURRENT_CHANNEL
+#undef BLOG_CURRENT_CHANNEL
+#endif
+#define BLOG_CURRENT_CHANNEL BLOG_CHANNEL_ncd_netmask

generated/blog_channels_defines.h

@@ -117,4 +117,5 @@
 #define BLOG_CHANNEL_ncd_parse 116
 #define BLOG_CHANNEL_ncd_valuemetic 117
 #define BLOG_CHANNEL_ncd_file 118
-#define BLOG_NUM_CHANNELS 119
+#define BLOG_CHANNEL_ncd_netmask 119
+#define BLOG_NUM_CHANNELS 120

generated/blog_channels_list.h

@@ -117,3 +117,4 @@
 {.name = "ncd_parse", .loglevel = 4},
 {.name = "ncd_valuemetic", .loglevel = 4},
 {.name = "ncd_file", .loglevel = 4},
+{.name = "ncd_netmask", .loglevel = 4},

ncd/CMakeLists.txt

@@ -109,6 +109,7 @@ add_executable(badvpn-ncd
     modules/parse.c
     modules/valuemetic.c
     modules/file.c
+    modules/netmask.c
     ${NCD_ADDITIONAL_SOURCES}
 )
 target_link_libraries(badvpn-ncd system flow flowextra dhcpclient arpprobe ncdconfig ncdvalue udevmonitor ncdinterfacemonitor ncdrequest)

ncd/modules/modules.h

@@ -98,6 +98,7 @@ extern const struct NCDModuleGroup ncdmodule_arithmetic;
 extern const struct NCDModuleGroup ncdmodule_parse;
 extern const struct NCDModuleGroup ncdmodule_valuemetic;
 extern const struct NCDModuleGroup ncdmodule_file;
+extern const struct NCDModuleGroup ncdmodule_netmask;
 
 static const struct NCDModuleGroup *ncd_modules[] = {
     &ncdmodule_var,
@@ -164,6 +165,7 @@ static const struct NCDModuleGroup *ncd_modules[] = {
     &ncdmodule_parse,
     &ncdmodule_valuemetic,
     &ncdmodule_file,
+    &ncdmodule_netmask,
     NULL
 };
 

ncd/modules/netmask.c

@@ -0,0 +1,230 @@
+/**
+ * @file netmask.c
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * @section DESCRIPTION
+ * 
+ * Synopsis:
+ *   ipv4_prefix_to_mask(string prefix)
+ *   ipv4_mask_to_prefix(string mask)
+ * 
+ * Variables:
+ *   string (empty) - converted
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#include <misc/ipaddr.h>
+#include <misc/parse_number.h>
+#include <ncd/NCDModule.h>
+
+#include <generated/blog_channel_ncd_netmask.h>
+
+#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
+
+struct prefix_to_mask_instance {
+    NCDModuleInst *i;
+    uint32_t mask;
+};
+
+struct mask_to_prefix_instance {
+    NCDModuleInst *i;
+    int prefix;
+};
+
+static void prefix_to_mask_func_init (NCDModuleInst *i)
+{
+    // allocate structure
+    struct prefix_to_mask_instance *o = malloc(sizeof(*o));
+    if (!o) {
+        ModuleLog(i, BLOG_ERROR, "malloc failed");
+        goto fail0;
+    }
+    o->i = i;
+    NCDModuleInst_Backend_SetUser(i, o);
+    
+    // read arguments
+    NCDValue *prefix_arg;
+    if (!NCDValue_ListRead(i->args, 1, &prefix_arg)) {
+        ModuleLog(i, BLOG_ERROR, "wrong arity");
+        goto fail1;
+    }
+    if (!NCDValue_IsStringNoNulls(prefix_arg)) {
+        ModuleLog(i, BLOG_ERROR, "wrong type");
+        goto fail1;
+    }
+    
+    // parse prefix
+    uintmax_t prefix;
+    if (!parse_unsigned_integer(NCDValue_StringValue(prefix_arg), &prefix) || prefix > 32) {
+        ModuleLog(i, BLOG_ERROR, "bad prefix");
+        goto fail1;
+    }
+    
+    // build mask
+    o->mask = ipaddr_ipv4_mask_from_prefix(prefix);
+    
+    // signal up
+    NCDModuleInst_Backend_Up(i);
+    return;
+    
+fail1:
+    free(o);
+fail0:
+    NCDModuleInst_Backend_SetError(i);
+    NCDModuleInst_Backend_Dead(i);
+}
+
+static void prefix_to_mask_func_die (void *vo)
+{
+    struct prefix_to_mask_instance *o = vo;
+    NCDModuleInst *i = o->i;
+    
+    // free structure
+    free(o);
+    
+    NCDModuleInst_Backend_Dead(i);
+}
+
+static int prefix_to_mask_func_getvar (void *vo, const char *name, NCDValue *out_value)
+{
+    struct prefix_to_mask_instance *o = vo;
+    
+    if (!strcmp(name, "")) {
+        uint8_t *x = (void *)&o->mask;
+        char buf[20];
+        sprintf(buf, "%"PRIu8".%"PRIu8".%"PRIu8".%"PRIu8, x[0], x[1], x[2], x[3]);
+        
+        if (!NCDValue_InitString(out_value, buf)) {
+            ModuleLog(o->i, BLOG_ERROR, "NCDValue_InitString failed");
+            return 0;
+        }
+        
+        return 1;
+    }
+    
+    return 0;
+}
+
+static void mask_to_prefix_func_init (NCDModuleInst *i)
+{
+    // allocate structure
+    struct mask_to_prefix_instance *o = malloc(sizeof(*o));
+    if (!o) {
+        ModuleLog(i, BLOG_ERROR, "malloc failed");
+        goto fail0;
+    }
+    o->i = i;
+    NCDModuleInst_Backend_SetUser(i, o);
+    
+    // read arguments
+    NCDValue *mask_arg;
+    if (!NCDValue_ListRead(i->args, 1, &mask_arg)) {
+        ModuleLog(i, BLOG_ERROR, "wrong arity");
+        goto fail1;
+    }
+    if (!NCDValue_IsStringNoNulls(mask_arg)) {
+        ModuleLog(i, BLOG_ERROR, "wrong type");
+        goto fail1;
+    }
+    
+    // parse mask
+    uint32_t mask;
+    if (!ipaddr_parse_ipv4_addr(NCDValue_StringValue(mask_arg), &mask)) {
+        ModuleLog(i, BLOG_ERROR, "bad mask");
+        goto fail1;
+    }
+    
+    // build prefix
+    if (!ipaddr_ipv4_prefix_from_mask(mask, &o->prefix)) {
+        ModuleLog(i, BLOG_ERROR, "bad mask");
+        goto fail1;
+    }
+    
+    // signal up
+    NCDModuleInst_Backend_Up(i);
+    return;
+    
+fail1:
+    free(o);
+fail0:
+    NCDModuleInst_Backend_SetError(i);
+    NCDModuleInst_Backend_Dead(i);
+}
+
+static void mask_to_prefix_func_die (void *vo)
+{
+    struct mask_to_prefix_instance *o = vo;
+    NCDModuleInst *i = o->i;
+    
+    // free structure
+    free(o);
+    
+    NCDModuleInst_Backend_Dead(i);
+}
+
+static int mask_to_prefix_func_getvar (void *vo, const char *name, NCDValue *out_value)
+{
+    struct mask_to_prefix_instance *o = vo;
+    
+    if (!strcmp(name, "")) {
+        char buf[6];
+        sprintf(buf, "%d", o->prefix);
+        
+        if (!NCDValue_InitString(out_value, buf)) {
+            ModuleLog(o->i, BLOG_ERROR, "NCDValue_InitString failed");
+            return 0;
+        }
+        
+        return 1;
+    }
+    
+    return 0;
+}
+
+static const struct NCDModule modules[] = {
+    {
+        .type = "ipv4_prefix_to_mask",
+        .func_new = prefix_to_mask_func_init,
+        .func_die = prefix_to_mask_func_die,
+        .func_getvar = prefix_to_mask_func_getvar
+    }, {
+        .type = "ipv4_mask_to_prefix",
+        .func_new = mask_to_prefix_func_init,
+        .func_die = mask_to_prefix_func_die,
+        .func_getvar = mask_to_prefix_func_getvar
+    }, {
+        .type = NULL
+    }
+};
+
+const struct NCDModuleGroup ncdmodule_netmask = {
+    .modules = modules
+};