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 #include <unistd.h>
  18
  19 #include <linux/types.h>
  20
  21 #include <libubox/uloop.h>
  22 #include <libubox/blobmsg.h>
  23 #include <libubox/list.h>
  24 #include <libubox/ustream.h>
  25 #include <libubus.h>
  26
  27 #include "syslog.h"
  28
  29 int debug = 0;
  30 static struct blob_buf b;
  31 static struct ubus_auto_conn conn;
  32 static LIST_HEAD(clients);
  33
  34 static const struct blobmsg_policy read_policy =
  35         { .name = "lines", .type = BLOBMSG_TYPE_INT32 };
  36
  37 static const struct blobmsg_policy write_policy =
  38         { .name = "event", .type = BLOBMSG_TYPE_STRING };
  39
  40 struct client {
  41         struct list_head list;
  42
  43         struct ustream_fd s;
  44         int fd;
  45 };
  46
  47 static void
  48 client_close(struct ustream *s)
  49 {
  50         struct client *cl = container_of(s, struct client, s.stream);
  51
  52         list_del(&cl->list);
  53         ustream_free(s);
  54         close(cl->fd);
  55         free(cl);
  56 }
  57
  58 static void
  59 client_notify_write(struct ustream *s, int bytes)
  60 {
  61 }
  62
  63 static void client_notify_state(struct ustream *s)
  64 {
  65         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         if (pipe(fds) == -1) {
  86                 fprintf(stderr, "logd: failed to create pipe: %s\n", strerror(errno));
  87                 return -1;
  88         }
  89         ubus_request_set_fd(ctx, req, fds[0]);
  90         cl = calloc(1, sizeof(*cl));
  91         cl->s.stream.notify_write = client_notify_write;
  92         cl->s.stream.notify_state = client_notify_state;
  93         cl->fd = fds[1];
  94         ustream_fd_init(&cl->s, cl->fd);
  95         list_add(&cl->list, &clients);
  96         l = log_list(count, NULL);
  97         while ((!tb || count) && l) {
  98                 blob_buf_init(&b, 0);
  99                 blobmsg_add_string(&b, "msg", l->data);
 100                 blobmsg_add_u32(&b, "id", l->id);
 101                 blobmsg_add_u32(&b, "priority", l->priority);
 102                 blobmsg_add_u32(&b, "source", l->source);
 103                 blobmsg_add_u64(&b, "time", l->ts.tv_sec * 1000LL);
 104                 l = log_list(count, l);
 105                 if (ustream_write(&cl->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false) <= 0)
 106                         break;
 107         }
 108         return 0;
 109 }
 110
 111 static int
 112 write_log(struct ubus_context *ctx, struct ubus_object *obj,
 113                 struct ubus_request_data *req, const char *method,
 114                 struct blob_attr *msg)
 115 {
 116         struct blob_attr *tb;
 117         char *event;
 118
 119         if (msg) {
 120                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
 121                 if (tb) {
 122                         event = blobmsg_get_string(tb);
 123                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
 124                 }
 125         }
 126
 127         return 0;
 128 }
 129
 130 static const struct ubus_method log_methods[] = {
 131         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
 132         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
 133 };
 134
 135 static struct ubus_object_type log_object_type =
 136         UBUS_OBJECT_TYPE("log", log_methods);
 137
 138 static struct ubus_object log_object = {
 139         .name = "log",
 140         .type = &log_object_type,
 141         .methods = log_methods,
 142         .n_methods = ARRAY_SIZE(log_methods),
 143 };
 144
 145 void
 146 ubus_notify_log(struct log_head *l)
 147 {
 148         struct client *c;
 149
 150         if (list_empty(&clients))
 151                 return;
 152
 153         list_for_each_entry(c, &clients, list) {
 154                 blob_buf_init(&b, 0);
 155                 blobmsg_add_string(&b, "msg", l->data);
 156                 blobmsg_add_u32(&b, "id", l->id);
 157                 blobmsg_add_u32(&b, "priority", l->priority);
 158                 blobmsg_add_u32(&b, "source", l->source);
 159                 blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 160                 ustream_write(&c->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false);
 161         }
 162 }
 163
 164 static void
 165 ubus_connect_handler(struct ubus_context *ctx)
 166 {
 167         int ret;
 168
 169         ret = ubus_add_object(ctx, &log_object);
 170         if (ret) {
 171                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 172                 exit(1);
 173         }
 174         fprintf(stderr, "log: connected to ubus\n");
 175 }
 176
 177 int
 178 main(int argc, char **argv)
 179 {
 180         int ch, log_size = 16;
 181
 182         signal(SIGPIPE, SIG_IGN);
 183         while ((ch = getopt(argc, argv, "S:")) != -1) {
 184                 switch (ch) {
 185                 case 'S':
 186                         log_size = atoi(optarg);
 187                         if (log_size < 1)
 188                                 log_size = 16;
 189                         break;
 190                 }
 191         }
 192         log_size *= 1024;
 193
 194         uloop_init();
 195         log_init(log_size);
 196         conn.cb = ubus_connect_handler;
 197         ubus_auto_connect(&conn);
 198         uloop_run();
 199         log_shutdown();
 200         uloop_done();
 201
 202         return 0;
 203 }