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 #include "count.h"
  20
  21 static struct ubus_context *ctx;
  22 static struct ubus_subscriber test_event;
  23 static struct blob_buf b;
  24
  25 enum {
  26         HELLO_ID,
  27         HELLO_MSG,
  28         __HELLO_MAX
  29 };
  30
  31 static const struct blobmsg_policy hello_policy[] = {
  32         [HELLO_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
  33         [HELLO_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
  34 };
  35
  36 struct hello_request {
  37         struct ubus_request_data req;
  38         struct uloop_timeout timeout;
  39         int fd;
  40         int idx;
  41         char data[];
  42 };
  43
  44 static void test_hello_fd_reply(struct uloop_timeout *t)
  45 {
  46         struct hello_request *req = container_of(t, struct hello_request, timeout);
  47         char *data;
  48
  49         data = alloca(strlen(req->data) + 32);
  50         sprintf(data, "msg%d: %s\n", ++req->idx, req->data);
  51         if (write(req->fd, data, strlen(data)) < 0) {
  52                 close(req->fd);
  53                 free(req);
  54                 return;
  55         }
  56
  57         uloop_timeout_set(&req->timeout, 1000);
  58 }
  59
  60 static void test_hello_reply(struct uloop_timeout *t)
  61 {
  62         struct hello_request *req = container_of(t, struct hello_request, timeout);
  63         int fds[2];
  64
  65         blob_buf_init(&b, 0);
  66         blobmsg_add_string(&b, "message", req->data);
  67         ubus_send_reply(ctx, &req->req, b.head);
  68
  69         pipe(fds);
  70         ubus_request_set_fd(ctx, &req->req, fds[0]);
  71         ubus_complete_deferred_request(ctx, &req->req, 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 enum {
 154     COUNT_TO,
 155     COUNT_STRING,
 156     __COUNT_MAX
 157 };
 158
 159 static const struct blobmsg_policy count_policy[__COUNT_MAX] = {
 160     [COUNT_TO] = { .name = "to", .type = BLOBMSG_TYPE_INT32 },
 161     [COUNT_STRING] = { .name = "string", .type = BLOBMSG_TYPE_STRING },
 162 };
 163
 164 static int test_count(struct ubus_context *ctx, struct ubus_object *obj,
 165                       struct ubus_request_data *req, const char *method,
 166                       struct blob_attr *msg)
 167 {
 168         struct blob_attr *tb[__COUNT_MAX];
 169         char *s1, *s2;
 170         uint32_t num;
 171
 172         blobmsg_parse(count_policy, __COUNT_MAX, tb, blob_data(msg), blob_len(msg));
 173         if (!tb[COUNT_TO] || !tb[COUNT_STRING])
 174                 return UBUS_STATUS_INVALID_ARGUMENT;
 175
 176         num = blobmsg_get_u32(tb[COUNT_TO]);
 177         s1 = blobmsg_get_string(tb[COUNT_STRING]);
 178         s2 = count_to_number(num);
 179         if (!s1 || !s2) {
 180                 free(s2);
 181                 return UBUS_STATUS_UNKNOWN_ERROR;
 182         }
 183         blob_buf_init(&b, 0);
 184         blobmsg_add_u32(&b, "rc", strcmp(s1, s2));
 185         ubus_send_reply(ctx, req, b.head);
 186         free(s2);
 187
 188         return 0;
 189 }
 190
 191 static const struct ubus_method test_methods[] = {
 192         UBUS_METHOD("hello", test_hello, hello_policy),
 193         UBUS_METHOD("watch", test_watch, watch_policy),
 194         UBUS_METHOD("count", test_count, count_policy),
 195 };
 196
 197 static struct ubus_object_type test_object_type =
 198         UBUS_OBJECT_TYPE("test", test_methods);
 199
 200 static struct ubus_object test_object = {
 201         .name = "test",
 202         .type = &test_object_type,
 203         .methods = test_methods,
 204         .n_methods = ARRAY_SIZE(test_methods),
 205 };
 206
 207 static void server_main(void)
 208 {
 209         int ret;
 210
 211         ret = ubus_add_object(ctx, &test_object);
 212         if (ret)
 213                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 214
 215         ret = ubus_register_subscriber(ctx, &test_event);
 216         if (ret)
 217                 fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 218
 219         uloop_run();
 220 }
 221
 222 int main(int argc, char **argv)
 223 {
 224         const char *ubus_socket = NULL;
 225         int ch;
 226
 227         while ((ch = getopt(argc, argv, "cs:")) != -1) {
 228                 switch (ch) {
 229                 case 's':
 230                         ubus_socket = optarg;
 231                         break;
 232                 default:
 233                         break;
 234                 }
 235         }
 236
 237         argc -= optind;
 238         argv += optind;
 239
 240         uloop_init();
 241         signal(SIGPIPE, SIG_IGN);
 242
 243         ctx = ubus_connect(ubus_socket);
 244         if (!ctx) {
 245                 fprintf(stderr, "Failed to connect to ubus\n");
 246                 return -1;
 247         }
 248
 249         ubus_add_uloop(ctx);
 250
 251         server_main();
 252
 253         ubus_free(ctx);
 254         uloop_done();
 255
 256         return 0;
 257 }