Implement basic interface iteration

ffvisd/ffvisd.c

@@ -1,5 +1,171 @@
+/*
+  Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  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.
+
+  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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
+*/
+
+
+#define _GNU_SOURCE
+
+#include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <net/if.h>
+
+
+#define ANNOUNCE_INTERVAL 20
+#define ANNOUNCE_TIMEOUT 60
+
+#define SYSFS_PATH_MAX 256
+#define SYSFS_CLASS_NET "/sys/class/net"
+
+
+//static char *mesh = "bat0";
+
+
+typedef struct _ffvisd_eth_address_t {
+	uint8_t address[6];
+} ffvisd_eth_address_t;
+
+typedef struct _ffvisd_ipv6_host_address_t {
+	uint8_t address[8];
+} ffvisd_ipv6_host_address_t;
+
+typedef struct _ffvisd_server_announce_t {
+	ffvisd_eth_address_t eth_address;
+	uint16_t reserved;
+	ffvisd_ipv6_host_address_t address;
+	uint32_t age;
+} ffvisd_server_announce_t;
+
+typedef struct _ffvisd_announce_t {
+	uint32_t magic;
+	uint32_t version;
+	uint32_t n_servers;
+	uint32_t reserved;
+	ffvisd_server_announce_t servers[];
+} ffvisd_announce_t;
+
+typedef struct _ffvisd_iface_t {
+	unsigned ifindex;
+	unsigned iftype;
+	char *ifname;
+	char *mesh_iface;
+} ffvisd_iface_t;
+
+
+typedef void (*iface_cb)(const ffvisd_iface_t *iface, void *arg);
+
+
+void ffvisd_iface_free(ffvisd_iface_t *iface);
+
+
+bool file_readv(const char *file, const char *format, va_list ap) {
+	FILE *f = fopen(file, "r");
+	if (!f)
+		return false;
+
+	int ret = vfscanf(f, format, ap);
+
+	fclose(f);
+
+	return (ret > 0);
+}
+
+bool iface_file_read(const char *ifname, const char *file, const char *format, ...) {
+	char filename[SYSFS_PATH_MAX];
+
+	snprintf(filename, SYSFS_PATH_MAX, SYSFS_CLASS_NET"/%s/%s", ifname, file);
+
+	va_list ap;
+	va_start(ap, format);
+	bool ret = file_readv(filename, format, ap);
+	va_end(ap);
+
+	return ret;
+}
+
+ffvisd_iface_t* ffvisd_iface_new(const char *ifname) {
+	ffvisd_iface_t *iface = calloc(1, sizeof(ffvisd_iface_t));
+
+	iface->ifname = strdup(ifname);
+
+	if (!iface_file_read(ifname, "ifindex", "%u", &iface->ifindex)) {
+		ffvisd_iface_free(iface);
+		return NULL;
+	}
+
+	if (!iface_file_read(ifname, "batman_adv/mesh_iface", "%as", &iface->mesh_iface) || !strcmp(iface->mesh_iface, "none")) {
+		free(iface->mesh_iface);
+		iface->mesh_iface = NULL;
+	}
+
+	return iface;
+}
+
+void ffvisd_iface_free(ffvisd_iface_t *iface) {
+	if (iface) {
+		free(iface->ifname);
+		free(iface->mesh_iface);
+		free(iface);
+	}
+}
+
+void ffvisd_iface_foreach(iface_cb cb, void *arg) {
+	struct dirent **namelist;
+
+	int i, count = scandir(SYSFS_CLASS_NET, &namelist, NULL, NULL);
+
+	if (count < 0) {
+		fprintf(stderr, "error: scandir: %m");
+		return;
+	}
+
+	for (i = 0; i < count; i++) {
+		ffvisd_iface_t *iface = ffvisd_iface_new(namelist[i]->d_name);
+
+		if (iface)
+			cb(iface, arg);
+
+		ffvisd_iface_free(iface);
+		free(namelist[i]);
+	}
+
+	free(namelist);
+}
+
+
+void pr_iface_info(const ffvisd_iface_t *iface, void *arg) {
+	printf("Interface %s: ifindex=%i mesh_iface=%s iftype=%i\n", iface->ifname, iface->ifindex, iface->mesh_iface, iface->iftype);
+}
+
 
 int main() {
+	ffvisd_iface_foreach(pr_iface_info, NULL);
+
 	return 0;
 }