modules/admin-full: add SVG based realtime bandwidth status

1 files changed, 315 insertions, 0 deletions

diff --git a/modules/admin-full/src/luci-bwc.c b/modules/admin-full/src/luci-bwc.c
new file mode 100644
index 0000000000..6b6c0c7101
--- /dev/null
+++ b/modules/admin-full/src/luci-bwc.c
@@ -0,0 +1,315 @@
+/*
+ * luci-bwc - Very simple bandwidth collector cache for LuCI realtime graphs
+ *
+ *   Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
+ *
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <fcntl.h>
+#include <time.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <arpa/inet.h>
+
+
+#define STEP_COUNT	60
+#define STEP_TIME	1
+
+#define DB_PATH		"/var/lib/luci-bwc"
+#define DB_FILE		DB_PATH "/%s"
+
+#define SCAN_PATTERN \
+	" %[^ :]:%" SCNu64 " %" SCNu64 \
+	" %*d %*d %*d %*d %*d %*d" \
+	" %" SCNu64 " %" SCNu64
+
+
+struct traffic_entry {
+	uint64_t time;
+	uint64_t rxb;
+	uint64_t rxp;
+	uint64_t txb;
+	uint64_t txp;
+};
+
+static uint64_t htonll(uint64_t value)
+{
+	int num = 1;
+
+	if (*(char *)&num == 1)
+		return htonl((uint32_t)(value & 0xFFFFFFFF)) |
+		       htonl((uint32_t)(value >> 32));
+
+	return value;
+}
+
+#define ntohll htonll
+
+
+static int init_minutely(const char *ifname)
+{
+	int i, file;
+	char path[1024];
+	char *p;
+	struct traffic_entry e = { 0 };
+
+	snprintf(path, sizeof(path), DB_FILE, ifname);
+
+	for (p = &path[1]; *p; p++)
+	{
+		if (*p == '/')
+		{
+			*p = 0;
+
+			if (mkdir(path, 0700) && (errno != EEXIST))
+				return -1;
+
+			*p = '/';
+		}
+	}
+
+	if ((file = open(path, O_WRONLY | O_CREAT, 0600)) >= 0)
+	{
+		for (i = 0; i < STEP_COUNT; i++)
+		{
+			if (write(file, &e, sizeof(struct traffic_entry)) < 0)
+				break;
+		}
+
+		close(file);
+
+		return 0;
+	}
+
+	return -1;
+}
+
+static int update_minutely(
+	const char *ifname, uint64_t rxb, uint64_t rxp, uint64_t txb, uint64_t txp
+) {
+	int rv = -1;
+
+	int file;
+	int entrysize = sizeof(struct traffic_entry);
+	int mapsize = STEP_COUNT * entrysize;
+
+	char path[1024];
+	char *map;
+
+	struct stat s;
+	struct traffic_entry e;
+
+	snprintf(path, sizeof(path), DB_FILE, ifname);
+
+	if (stat(path, &s))
+	{
+		if (init_minutely(ifname))
+		{
+			fprintf(stderr, "Failed to init %s: %s\n",
+					path, strerror(errno));
+
+			return rv;
+		}
+	}
+
+	if ((file = open(path, O_RDWR)) >= 0)
+	{
+		map = mmap(NULL, mapsize, PROT_READ | PROT_WRITE,
+				   MAP_SHARED | MAP_LOCKED, file, 0);
+
+		if ((map != NULL) && (map != MAP_FAILED))
+		{
+			e.time = htonll(time(NULL));
+			e.rxb  = htonll(rxb);
+			e.rxp  = htonll(rxp);
+			e.txb  = htonll(txb);
+			e.txp  = htonll(txp);
+
+			memmove(map, map + entrysize, mapsize - entrysize);
+			memcpy(map + mapsize - entrysize, &e, entrysize);
+
+			munmap(map, mapsize);
+
+			rv = 0;
+		}
+
+		close(file);
+	}
+
+	return rv;
+}
+
+static int run_daemon(int nofork)
+{
+	FILE *info;
+	uint64_t rxb, txb, rxp, txp;
+	char line[1024];
+	char ifname[16];
+
+
+	if (!nofork)
+	{
+		switch (fork())
+		{
+			case -1:
+				perror("fork()");
+				return -1;
+
+			case 0:
+				if (chdir("/") < 0)
+				{
+					perror("chdir()");
+					exit(1);
+				}
+
+				close(0);
+				close(1);
+				close(2);
+				break;
+
+			default:
+				exit(0);
+		}
+	}
+
+
+	/* go */
+	while (1)
+	{
+		if ((info = fopen("/proc/net/dev", "r")) != NULL)
+		{
+			while (fgets(line, sizeof(line), info))
+			{
+				if (strchr(line, '|'))
+					continue;
+
+				if (sscanf(line, SCAN_PATTERN, ifname, &rxb, &rxp, &txb, &txp))
+				{
+					if (strncmp(ifname, "lo", sizeof(ifname)))
+						update_minutely(ifname, rxb, rxp, txb, txp);
+				}
+			}
+
+			fclose(info);
+		}
+
+		sleep(STEP_TIME);
+	}
+}
+
+static int run_dump(const char *ifname)
+{
+	int rv = 1;
+
+	int i, file;
+	int entrysize = sizeof(struct traffic_entry);
+	int mapsize = STEP_COUNT * entrysize;
+
+	char path[1024];
+	char *map;
+
+	struct traffic_entry *e;
+
+	snprintf(path, sizeof(path), DB_FILE, ifname);
+
+	if ((file = open(path, O_RDONLY)) >= 0)
+	{
+		map = mmap(NULL, mapsize, PROT_READ, MAP_SHARED | MAP_LOCKED, file, 0);
+
+		if ((map != NULL) && (map != MAP_FAILED))
+		{
+			for (i = 0; i < mapsize; i += entrysize)
+			{
+				e = (struct traffic_entry *) &map[i];
+
+				if (!e->time)
+					continue;
+
+				printf("[ %" PRIu64 ", %" PRIu64 ", %" PRIu64
+					   ", %" PRIu64 ", %" PRIu64 " ]%s\n",
+					ntohll(e->time),
+					ntohll(e->rxb), ntohll(e->rxp),
+					ntohll(e->txb), ntohll(e->txp),
+					((i + entrysize) < mapsize) ? "," : "");
+			}
+
+			munmap(map, mapsize);
+			rv = 0;
+		}
+
+		close(file);
+	}
+	else
+	{
+		fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
+	}
+
+	return rv;
+}
+
+
+int main(int argc, char *argv[])
+{
+	int opt;
+	int daemon = 0;
+	int nofork = 0;
+	int dprint = 0;
+	char *ifname = NULL;
+
+	while ((opt = getopt(argc, argv, "dfp:")) > -1)
+	{
+		switch (opt)
+		{
+			case 'd':
+				daemon = 1;
+				break;
+
+			case 'f':
+				nofork = 1;
+				break;
+
+			case 'p':
+				dprint = 1;
+				ifname = optarg;
+				break;
+
+			default:
+				break;
+		}
+	}
+
+	if (daemon)
+		return run_daemon(nofork);
+
+	else if (dprint && ifname)
+		return run_dump(ifname);
+
+	else
+		fprintf(stderr,
+			"Usage:\n"
+			"	%s -d [-f]\n"
+			"	%s -p ifname\n",
+				argv[0], argv[0]
+		);
+
+	return 1;
+}