examples/server.c

   1 /*
   2  * Copyright (C) 2011-2014 Felix Fietkau <nbd@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 <unistd.h>
  15 #include <signal.h>
  16
  17 #include <libubox/blobmsg_json.h>
  18 #include "libubus.h"
  19
  20 static struct ubus_context *ctx;
  21 static struct ubus_subscriber test_event;
  22 static struct blob_buf b;
  23
  24 enum {
  25         HELLO_ID,
  26         HELLO_MSG,
  27         __HELLO_MAX
  28 };
  29
  30 static const struct blobmsg_policy hello_policy[] = {
  31         [HELLO_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
  32         [HELLO_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
  33 };
  34
  35 struct hello_request {
  36         struct ubus_request_data req;
  37         struct uloop_timeout timeout;
  38         int fd;
  39         int idx;
  40         char data[];
  41 };
  42
  43 static void test_hello_fd_reply(struct uloop_timeout *t)
  44 {
  45         struct hello_request *req = container_of(t, struct hello_request, timeout);
  46         char *data;
  47
  48         data = alloca(strlen(req->data) + 32);
  49         sprintf(data, "msg%d: %s\n", ++req->idx, req->data);
  50         if (write(req->fd, data, strlen(data)) < 0) {
  51                 close(req->fd);
  52                 free(req);
  53                 return;
  54         }
  55
  56         uloop_timeout_set(&req->timeout, 1000);
  57 }
  58
  59 static void test_hello_reply(struct uloop_timeout *t)
  60 {
  61         struct hello_request *req = container_of(t, struct hello_request, timeout);
  62         int fds[2];
  63
  64         blob_buf_init(&b, 0);
  65         blobmsg_add_string(&b, "message", req->data);
  66         ubus_send_reply(ctx, &req->req, b.head);
  67
  68         pipe(fds);
  69         ubus_request_set_fd(ctx, &req->req, fds[0]);
  70         ubus_complete_deferred_request(ctx, &req->req, 0);
  71         close(fds[0]);
  72         req->fd = fds[1];
  73
  74         req->timeout.cb = test_hello_fd_reply;
  75         test_hello_fd_reply(t);
  76 }
  77
  78 static int test_hello(struct ubus_context *ctx, struct ubus_object *obj,
  79                       struct ubus_request_data *req, const char *method,
  80                       struct blob_attr *msg)
  81 {
  82         struct hello_request *hreq;
  83         struct blob_attr *tb[__HELLO_MAX];
  84         const char *format = "%s received a message: %s";
  85         const char *msgstr = "(unknown)";
  86
  87         blobmsg_parse(hello_policy, ARRAY_SIZE(hello_policy), tb, blob_data(msg), blob_len(msg));
  88
  89         if (tb[HELLO_MSG])
  90                 msgstr = blobmsg_data(tb[HELLO_MSG]);
  91
  92         hreq = calloc(1, sizeof(*hreq) + strlen(format) + strlen(obj->name) + strlen(msgstr) + 1);
  93         sprintf(hreq->data, format, obj->name, msgstr);
  94         ubus_defer_request(ctx, req, &hreq->req);
  95         hreq->timeout.cb = test_hello_reply;
  96         uloop_timeout_set(&hreq->timeout, 1000);
  97
  98         return 0;
  99 }
 100
 101 enum {
 102         WATCH_ID,
 103         WATCH_COUNTER,
 104         __WATCH_MAX
 105 };
 106
 107 static const struct blobmsg_policy watch_policy[__WATCH_MAX] = {
 108         [WATCH_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 109         [WATCH_COUNTER] = { .name = "counter", .type = BLOBMSG_TYPE_INT32 },
 110 };
 111
 112 static void
 113 test_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
 114                    uint32_t id)
 115 {
 116         fprintf(stderr, "Object %08x went away\n", id);
 117 }
 118
 119 static int
 120 test_notify(struct ubus_context *ctx, struct ubus_object *obj,
 121             struct ubus_request_data *req, const char *method,
 122             struct blob_attr *msg)
 123 {
 124 #if 0
 125         char *str;
 126
 127         str = blobmsg_format_json(msg, true);
 128         fprintf(stderr, "Received notification '%s': %s\n", method, str);
 129         free(str);
 130 #endif
 131
 132         return 0;
 133 }
 134
 135 static int test_watch(struct ubus_context *ctx, struct ubus_object *obj,
 136                       struct ubus_request_data *req, const char *method,
 137                       struct blob_attr *msg)
 138 {
 139         struct blob_attr *tb[__WATCH_MAX];
 140         int ret;
 141
 142         blobmsg_parse(watch_policy, __WATCH_MAX, tb, blob_data(msg), blob_len(msg));
 143         if (!tb[WATCH_ID])
 144                 return UBUS_STATUS_INVALID_ARGUMENT;
 145
 146         test_event.remove_cb = test_handle_remove;
 147         test_event.cb = test_notify;
 148         ret = ubus_subscribe(ctx, &test_event, blobmsg_get_u32(tb[WATCH_ID]));
 149         fprintf(stderr, "Watching object %08x: %s\n", blobmsg_get_u32(tb[WATCH_ID]), ubus_strerror(ret));
 150         return ret;
 151 }
 152
 153 static const struct ubus_method test_methods[] = {
 154         UBUS_METHOD("hello", test_hello, hello_policy),
 155         UBUS_METHOD("watch", test_watch, watch_policy),
 156 };
 157
 158 static struct ubus_object_type test_object_type =
 159         UBUS_OBJECT_TYPE("test", test_methods);
 160
 161 static struct ubus_object test_object = {
 162         .name = "test",
 163         .type = &test_object_type,
 164         .methods = test_methods,
 165         .n_methods = ARRAY_SIZE(test_methods),
 166 };
 167
 168 static void server_main(void)
 169 {
 170         int ret;
 171
 172         ret = ubus_add_object(ctx, &test_object);
 173         if (ret)
 174                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 175
 176         ret = ubus_register_subscriber(ctx, &test_event);
 177         if (ret)
 178                 fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 179
 180         uloop_run();
 181 }
 182
 183 int main(int argc, char **argv)
 184 {
 185         const char *ubus_socket = NULL;
 186         int ch;
 187
 188         while ((ch = getopt(argc, argv, "cs:")) != -1) {
 189                 switch (ch) {
 190                 case 's':
 191                         ubus_socket = optarg;
 192                         break;
 193                 default:
 194                         break;
 195                 }
 196         }
 197
 198         argc -= optind;
 199         argv += optind;
 200
 201         uloop_init();
 202         signal(SIGPIPE, SIG_IGN);
 203
 204         ctx = ubus_connect(ubus_socket);
 205         if (!ctx) {
 206                 fprintf(stderr, "Failed to connect to ubus\n");
 207                 return -1;
 208         }
 209
 210         ubus_add_uloop(ctx);
 211
 212         server_main();
 213
 214         ubus_free(ctx);
 215         uloop_done();
 216
 217         return 0;
 218 }