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 client_notify_state(struct ustream *s)
  59 {
  60         client_close(s);
  61 }
  62
  63 static int
  64 read_log(struct ubus_context *ctx, struct ubus_object *obj,
  65                 struct ubus_request_data *req, const char *method,
  66                 struct blob_attr *msg)
  67 {
  68         struct client *cl;
  69         struct blob_attr *tb;
  70         struct log_head *l;
  71         int count = 0;
  72         int fds[2];
  73
  74         if (msg) {
  75                 blobmsg_parse(&read_policy, 1, &tb, blob_data(msg), blob_len(msg));
  76                 if (tb)
  77                         count = blobmsg_get_u32(tb);
  78         }
  79
  80         if (pipe(fds) == -1) {
  81                 fprintf(stderr, "logd: failed to create pipe: %s\n", strerror(errno));
  82                 return -1;
  83         }
  84         ubus_request_set_fd(ctx, req, fds[0]);
  85         cl = calloc(1, sizeof(*cl));
  86         cl->s.stream.notify_state = client_notify_state;
  87         cl->fd = fds[1];
  88         ustream_fd_init(&cl->s, cl->fd);
  89         list_add(&cl->list, &clients);
  90         l = log_list(count, NULL);
  91         while ((!tb || count) && l) {
  92                 blob_buf_init(&b, 0);
  93                 blobmsg_add_string(&b, "msg", l->data);
  94                 blobmsg_add_u32(&b, "id", l->id);
  95                 blobmsg_add_u32(&b, "priority", l->priority);
  96                 blobmsg_add_u32(&b, "source", l->source);
  97                 blobmsg_add_u64(&b, "time", l->ts.tv_sec * 1000LL);
  98                 l = log_list(count, l);
  99                 if (ustream_write(&cl->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false) <= 0)
 100                         break;
 101         }
 102         return 0;
 103 }
 104
 105 static int
 106 write_log(struct ubus_context *ctx, struct ubus_object *obj,
 107                 struct ubus_request_data *req, const char *method,
 108                 struct blob_attr *msg)
 109 {
 110         struct blob_attr *tb;
 111         char *event;
 112
 113         if (msg) {
 114                 blobmsg_parse(&write_policy, 1, &tb, blob_data(msg), blob_len(msg));
 115                 if (tb) {
 116                         event = blobmsg_get_string(tb);
 117                         log_add(event, strlen(event) + 1, SOURCE_SYSLOG);
 118                 }
 119         }
 120
 121         return 0;
 122 }
 123
 124 static const struct ubus_method log_methods[] = {
 125         { .name = "read", .handler = read_log, .policy = &read_policy, .n_policy = 1 },
 126         { .name = "write", .handler = write_log, .policy = &write_policy, .n_policy = 1 },
 127 };
 128
 129 static struct ubus_object_type log_object_type =
 130         UBUS_OBJECT_TYPE("log", log_methods);
 131
 132 static struct ubus_object log_object = {
 133         .name = "log",
 134         .type = &log_object_type,
 135         .methods = log_methods,
 136         .n_methods = ARRAY_SIZE(log_methods),
 137 };
 138
 139 void
 140 ubus_notify_log(struct log_head *l)
 141 {
 142         struct client *c;
 143
 144         if (list_empty(&clients))
 145                 return;
 146
 147         list_for_each_entry(c, &clients, list) {
 148                 blob_buf_init(&b, 0);
 149                 blobmsg_add_string(&b, "msg", l->data);
 150                 blobmsg_add_u32(&b, "id", l->id);
 151                 blobmsg_add_u32(&b, "priority", l->priority);
 152                 blobmsg_add_u32(&b, "source", l->source);
 153                 blobmsg_add_u64(&b, "time", (((__u64) l->ts.tv_sec) * 1000) + (l->ts.tv_nsec / 1000000));
 154                 ustream_write(&c->s.stream, (void *) b.head, blob_len(b.head) + sizeof(struct blob_attr), false);
 155         }
 156 }
 157
 158 static void
 159 ubus_connect_handler(struct ubus_context *ctx)
 160 {
 161         int ret;
 162
 163         ret = ubus_add_object(ctx, &log_object);
 164         if (ret) {
 165                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 166                 exit(1);
 167         }
 168         fprintf(stderr, "log: connected to ubus\n");
 169 }
 170
 171 int
 172 main(int argc, char **argv)
 173 {
 174         int ch, log_size = 16;
 175
 176         signal(SIGPIPE, SIG_IGN);
 177         while ((ch = getopt(argc, argv, "S:")) != -1) {
 178                 switch (ch) {
 179                 case 'S':
 180                         log_size = atoi(optarg);
 181                         if (log_size < 1)
 182                                 log_size = 16;
 183                         break;
 184                 }
 185         }
 186         log_size *= 1024;
 187
 188         uloop_init();
 189         log_init(log_size);
 190         conn.cb = ubus_connect_handler;
 191         ubus_auto_connect(&conn);
 192         uloop_run();
 193         log_shutdown();
 194         uloop_done();
 195
 196         return 0;
 197 }