extend logread

* log to file
* add pidfile support
* reconnect when logging over network

diff --git a/logread.c b/logread.c
index 5d1be68cef0c34fdd30b83290d8520dc4e1798ab..fc1d0ce394858ce0f66339d2d9550f0ae86fb24d 100644 (file)
--- a/logread.c
+++ b/logread.c
@@ -12,9 +12,15 @@
  * GNU General Public License for more details.
  */
 
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <fcntl.h>
 #include <time.h>
-#include <unistd.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 
 #define SYSLOG_NAMES
 #include <syslog.h>
@@ -24,6 +30,12 @@
 #include <libubox/uloop.h>
 #include "libubus.h"
 
+enum {
+       LOG_STDOUT,
+       LOG_FILE,
+       LOG_NET,
+};
+
 enum {
        LOG_MSG,
        LOG_ID,
@@ -41,14 +53,24 @@ static const struct blobmsg_policy log_policy[] = {
        [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 },
 };
 
-enum {
-       WATCH_ID,
-       WATCH_COUNTER,
-       __WATCH_MAX
-};
-
 static struct ubus_subscriber log_event;
+static struct uloop_timeout retry;
 static struct uloop_fd sender;
+static const char *log_file, *log_ip, *log_port, *pid_file;
+static int log_type = LOG_STDOUT;
+static int log_size;
+
+static void log_handle_reconnect(struct uloop_timeout *timeout)
+{
+       sender.fd = usock(USOCK_TCP | USOCK_NUMERIC, log_ip, log_port);
+       if (sender.fd < 0) {
+               fprintf(stderr, "failed to connect: %s\n", strerror(errno));
+               uloop_timeout_set(&retry, 1000);
+       } else {
+               uloop_fd_add(&sender, ULOOP_READ);
+               syslog(0, "Logread connected to %s:%s\n", log_ip, log_port);
+       }
+}
 
 static void log_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
                        uint32_t id)
@@ -56,21 +78,51 @@ static void log_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *
        fprintf(stderr, "Object %08x went away\n", id);
 }
 
+static void log_handle_fd(struct uloop_fd *u, unsigned int events)
+{
+       if (u->eof) {
+               uloop_fd_delete(u);
+               close(sender.fd);
+               sender.fd = -1;
+               uloop_timeout_set(&retry, 1000);
+       }
+}
+
 static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
                        struct ubus_request_data *req, const char *method,
                        struct blob_attr *msg)
 {
        struct blob_attr *tb[__LOG_MAX];
+       struct stat s;
        char buf[256];
        uint32_t p;
        char *str;
        time_t t;
        char *c;
 
+       if (sender.fd < 0)
+               return 0;
+
        blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg));
        if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME])
                return 1;
 
+       if ((log_type == LOG_FILE) && log_size && (!stat(log_file, &s)) && (s.st_size > log_size)) {
+               char *old = malloc(strlen(log_file) + 5);
+
+               close(sender.fd);
+               if (old) {
+                       sprintf(old, "%s.old", log_file);
+                       rename(log_file, old);
+                       free(old);
+               }
+               sender.fd = open(log_file, O_CREAT | O_WRONLY | O_TRUNC);
+               if (sender.fd < 0) {
+//                     fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno));
+                       exit(-1);
+               }
+       }
+
        t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
        c = ctime(&t);
        p = blobmsg_get_u32(tb[LOG_PRIO]);
@@ -80,17 +132,33 @@ static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
                c, facilitynames[LOG_FAC(p)].c_name, prioritynames[LOG_PRI(p)].c_name,
                (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"),
                method);
-       write(sender.fd, buf, strlen(buf));
+       if (log_type == LOG_NET)
+               send(sender.fd, buf, strlen(buf), 0);
+       else
+               write(sender.fd, buf, strlen(buf));
 
        free(str);
+       if (log_type == LOG_FILE)
+               fsync(sender.fd);
 
        return 0;
 }
 
-static void follow_log(struct ubus_context *ctx, int id, const char *url, const char *port)
+static void follow_log(struct ubus_context *ctx, int id)
 {
+       FILE *fp;
        int ret;
 
+       signal(SIGPIPE, SIG_IGN);
+
+       if (pid_file) {
+               fp = fopen(pid_file, "w+");
+               if (fp) {
+                       fprintf(fp, "%d", getpid());
+                       fclose(fp);
+               }
+       }
+
        uloop_init();
        ubus_add_uloop(ctx);
 
@@ -104,13 +172,18 @@ static void follow_log(struct ubus_context *ctx, int id, const char *url, const
        if (ret)
                fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 
-       if (url && port) {
-               sender.fd = usock(USOCK_TCP | USOCK_NUMERIC, url, port);
+       if (log_ip && log_port) {
+               openlog("logread", LOG_PID, LOG_DAEMON);
+               log_type = LOG_NET;
+               sender.cb = log_handle_fd;
+               retry.cb = log_handle_reconnect;
+               uloop_timeout_set(&retry, 1000);
+       } else if (log_file) {
+               log_type = LOG_FILE;
+               sender.fd = open(log_file, O_CREAT | O_WRONLY);
                if (sender.fd < 0) {
-                       fprintf(stderr, "failed to connect: %s\n", strerror(errno));
+                       fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno));
                        exit(-1);
-               } else {
-                       uloop_fd_add(&sender, ULOOP_READ);
                }
        } else {
                sender.fd = STDOUT_FILENO;
@@ -174,6 +247,9 @@ static int usage(const char *prog)
                "    -s <path>          Path to ubus socket\n"
                "    -l <count>         Got only the last 'count' messages\n"
                "    -r <server> <port> Stream message to a server\n"
+               "    -F <file>          Log file\n"
+               "    -S <bytes>         Log size\n"
+               "    -p <file>          PID file\n"
                "    -f                 Follow log messages\n"
                "\n", prog);
        return 1;
@@ -183,18 +259,24 @@ int main(int argc, char **argv)
 {
        struct ubus_context *ctx;
        uint32_t id;
-       const char *ubus_socket = NULL, *url = NULL, *port = NULL;
+       const char *ubus_socket = NULL;
        int ch, ret, subscribe = 0, lines = 0;
        static struct blob_buf b;
 
-       while ((ch = getopt(argc, argv, "fs:l:r:")) != -1) {
+       while ((ch = getopt(argc, argv, "fcs:l:r:F:p:S:")) != -1) {
                switch (ch) {
                case 's':
                        ubus_socket = optarg;
                        break;
                case 'r':
-                       url = optarg++;
-                       port = argv[optind++];
+                       log_ip = optarg++;
+                       log_port = argv[optind++];
+                       break;
+               case 'F':
+                       log_file = optarg;
+                       break;
+               case 'p':
+                       pid_file = optarg;
                        break;
                case 'f':
                        subscribe = 1;
@@ -202,6 +284,12 @@ int main(int argc, char **argv)
                case 'l':
                        lines = atoi(optarg);
                        break;
+               case 'S':
+                       log_size = atoi(optarg);
+                       if (log_size < 1)
+                               log_size = 1;
+                       log_size *= 1024;
+                       break;
                default:
                        return usage(*argv);
                }
@@ -225,7 +313,7 @@ int main(int argc, char **argv)
        }
 
        if (subscribe)
-               follow_log(ctx, id, url, port);
+               follow_log(ctx, id);
 
        return 0;
 }