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