ubus.c

   1 /*
   2  * Copyright (C) 2014 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 <sys/types.h>
  15 #include <arpa/inet.h>
  16
  17 #include <stdio.h>
  18
  19 #include <libubus.h>
  20 #include <libubox/avl.h>
  21 #include <libubox/uloop.h>
  22
  23 #include "util.h"
  24 #include "ubus.h"
  25 #include "cache.h"
  26 #include "service.h"
  27
  28 static struct ubus_auto_conn conn;
  29 static struct blob_buf b;
  30
  31 static int
  32 mdns_reload(struct ubus_context *ctx, struct ubus_object *obj,
  33                 struct ubus_request_data *req, const char *method,
  34                 struct blob_attr *msg)
  35 {
  36         service_init();
  37         return 0;
  38 }
  39
  40 static int
  41 mdns_scan(struct ubus_context *ctx, struct ubus_object *obj,
  42                 struct ubus_request_data *req, const char *method,
  43                 struct blob_attr *msg)
  44 {
  45         cache_scan();
  46         return 0;
  47 }
  48
  49 static int
  50 mdns_browse(struct ubus_context *ctx, struct ubus_object *obj,
  51                 struct ubus_request_data *req, const char *method,
  52                 struct blob_attr *msg)
  53 {
  54         struct cache_entry *s, *q;
  55         char *buffer = (char *) mdns_buf;
  56         void *c1 = NULL, *c2;
  57
  58         blob_buf_init(&b, 0);
  59         avl_for_each_element(&entries, s, avl) {
  60                 char *local;
  61                 if (*((char *) s->avl.key) != '_')
  62                         continue;
  63                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->avl.key);
  64                 local = strstr(buffer, ".local");
  65                 if (local)
  66                         *local = '\0';
  67                 if (!strcmp(buffer, "_tcp") || !strcmp(buffer, "_udp"))
  68                         continue;
  69
  70                 if (!c1) {
  71                         c1 = blobmsg_open_table(&b, buffer);
  72                 }
  73                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->entry);
  74                 local = strstr(buffer, "._");
  75                 if (local)
  76                         *local = '\0';
  77                 c2 = blobmsg_open_table(&b, buffer);
  78                 strncat(buffer, ".local", MAX_NAME_LEN);
  79                 cache_dump_records(&b, buffer);
  80                 cache_dump_records(&b, s->entry);
  81                 blobmsg_close_table(&b, c2);
  82                 q = avl_next_element(s, avl);
  83                 if (!q || avl_is_last(&entries, &s->avl) || strcmp(s->avl.key, q->avl.key)) {
  84                         blobmsg_close_table(&b, c1);
  85                         c1 = NULL;
  86                 }
  87         }
  88         ubus_send_reply(ctx, req, b.head);
  89
  90         return UBUS_STATUS_OK;
  91 }
  92
  93 static int
  94 mdns_hosts(struct ubus_context *ctx, struct ubus_object *obj,
  95                 struct ubus_request_data *req, const char *method,
  96                 struct blob_attr *msg)
  97 {
  98         struct cache_entry *s;
  99         char *buffer = (char *) mdns_buf;
 100         void *c;
 101
 102         blob_buf_init(&b, 0);
 103         avl_for_each_element(&entries, s, avl) {
 104                 char *local;
 105                 if (*((char *) s->avl.key) == '_')
 106                         continue;
 107                 snprintf(buffer, MAX_NAME_LEN, "%s", (const char *) s->entry);
 108                 local = strstr(buffer, "._");
 109                 if (local)
 110                         *local = '\0';
 111                 c = blobmsg_open_table(&b, buffer);
 112                 strncat(buffer, ".local", MAX_NAME_LEN);
 113                 cache_dump_records(&b, buffer);
 114                 cache_dump_records(&b, s->entry);
 115                 blobmsg_close_table(&b, c);
 116         }
 117         ubus_send_reply(ctx, req, b.head);
 118
 119         return UBUS_STATUS_OK;
 120 }
 121
 122 static const struct ubus_method mdns_methods[] = {
 123         UBUS_METHOD_NOARG("scan", mdns_scan),
 124         UBUS_METHOD_NOARG("browse", mdns_browse),
 125         UBUS_METHOD_NOARG("hosts", mdns_hosts),
 126         UBUS_METHOD_NOARG("reload", mdns_reload),
 127 };
 128
 129 static struct ubus_object_type mdns_object_type =
 130         UBUS_OBJECT_TYPE("mdns", mdns_methods);
 131
 132 static struct ubus_object mdns_object = {
 133         .name = "mdns",
 134         .type = &mdns_object_type,
 135         .methods = mdns_methods,
 136         .n_methods = ARRAY_SIZE(mdns_methods),
 137 };
 138
 139 static void
 140 ubus_connect_handler(struct ubus_context *ctx)
 141 {
 142         int ret;
 143
 144         ret = ubus_add_object(ctx, &mdns_object);
 145         if (ret)
 146                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 147 }
 148
 149 void
 150 ubus_startup(void)
 151 {
 152         conn.cb = ubus_connect_handler;
 153         ubus_auto_connect(&conn);
 154 }