log/logd.c

   1 /*
   2  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU Lesser General Public License version 2.1
   6  * as published by the Free Software Foundation
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <stdio.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17
  18 #include <linux/types.h>
  19
  20 #include <libubox/uloop.h>
  21 #include <libubox/blobmsg.h>
  22 #include <libubox/list.h>
  23 #include <libubox/ustream.h>
  24 #include <libubus.h>
  25
  26 #include "syslog.h"
  27
  28 int debug = 0;
  29 static struct blob_buf b;
  30 static struct ubus_auto_conn conn;
  31 static LIST_HEAD(clients);
  32
  33 static const struct blobmsg_policy read_policy =
  34         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  35
  36 static const struct blobmsg_policy write_policy =
  37         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  38
  39 struct client {
  40         struct list_head list;
  41
  42         struct ustream_fd s;
  43         int fd;
  44 };
  45
  46 static void
  47 client_close(struct ustream *s)
  48 {
  49         struct client *cl = container_of(s, struct client, s.stream);
  50
  51         list_del(&cl->list);
  52         ustream_free(s);
  53         close(cl->fd);
  54         free(cl);
  55 }
  56
  57 static void
  58 client_notify_write(struct ustream *s, int bytes)
  59 {
  60         client_close(s);
  61 }
  62
  63 static void client_notify_state(struct ustream *s)
  64 {
  65         return client_close(s);
  66 }
  67
  68 static int
  69 read_log(struct ubus_context *ctx, struct ubus_object *obj,
  70                 struct ubus_request_data *req, const char *method,
  71                 struct blob_attr *msg)
  72 {
  73         struct client *cl;
  74         struct blob_attr *tb;
  75         struct log_head *l;
  76         int count = 0;
  77         int fds[2];
  78
  79         if (msg) {
  80                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  81                 if (tb)
  82                         count = blobmsg_get_u32(tb);
  83         }
  84
  85         pipe(fds);
  86         ubus_request_set_fd(ctx, req, fds[0]);
  87         cl = calloc(1, sizeof(*cl));
  88         cl->s.stream.notify_write = client_notify_write;
  89         cl->s.stream.notify_state = client_notify_state;
  90         cl->fd = fds[1];
  91         ustream_fd_init(&cl->s, cl->fd);
  92         list_add(&cl->list, &clients);
  93         l = log_list(count, NULL);
  94         while ((!tb || count) && l) {
  95                 blob_buf_init(&b, 0);
  96                 blobmsg_add_string(&b, "msg", l->data);
  97                 blobmsg_add_u32(&b, "id", l->id);
  98                 blobmsg_add_u32(&b, "priority", l->priority);
  99                 blobmsg_add_u32(&b, "source", l->source);
 100                 blobmsg_add_u64(&b, "time", l->ts.tv_sec);
 101                 l = log_list(count, l);
 102                 if (ustream_write(&cl->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false) <= 0)
 103                         break;
 104         }
 105         return 0;
 106 }
 107
 108 static int
 109 write_log(struct ubus_context *ctx, struct ubus_object *obj,
 110                 struct ubus_request_data *req, const char *method,
 111                 struct blob_attr *msg)
 112 {
 113         struct blob_attr *tb;
 114         char *event;
 115
 116         if (msg) {
 117                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
 118                 if (tb) {
 119                         event = blobmsg_get_string(tb);
 120                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
 121                 }
 122         }
 123
 124         return 0;
 125 }
 126
 127 static const struct ubus_method log_methods[] = {
 128         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
 129         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
 130 };
 131
 132 static struct ubus_object_type log_object_type =
 133         UBUS_OBJECT_TYPE("log", log_methods);
 134
 135 static struct ubus_object log_object = {
 136         .name = "log",
 137         .type = &log_object_type,
 138         .methods = log_methods,
 139         .n_methods = ARRAY_SIZE(log_methods),
 140 };
 141
 142 void
 143 ubus_notify_log(struct log_head *l)
 144 {
 145         struct client *c;
 146
 147         if (list_empty(&clients))
 148                 return;
 149
 150         list_for_each_entry(c, &clients, list) {
 151                 blob_buf_init(&b, 0);
 152                 blobmsg_add_string(&b, "msg", l->data);
 153                 blobmsg_add_u32(&b, "id", l->id);
 154                 blobmsg_add_u32(&b, "priority", l->priority);
 155                 blobmsg_add_u32(&b, "source", l->source);
 156                 blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 157                 ustream_write(&c->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false);
 158         }
 159 }
 160
 161 static void
 162 ubus_connect_handler(struct ubus_context *ctx)
 163 {
 164         int ret;
 165
 166         ret = ubus_add_object(ctx, &log_object);
 167         if (ret)
 168                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 169         fprintf(stderr, "log: connected to ubus\n");
 170 }
 171
 172 int
 173 main(int argc, char **argv)
 174 {
 175         signal(SIGPIPE, SIG_IGN);
 176
 177         uloop_init();
 178         log_init();
 179         conn.cb = ubus_connect_handler;
 180         ubus_auto_connect(&conn);
 181         uloop_run();
 182         log_shutdown();
 183         uloop_done();
 184
 185         return 0;
 186 }