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         if (pipe(fds) == -1) {
  70                 fprintf(stderr, "Failed to create pipe\n");
  71                 return;
  72         }
  73         ubus_request_set_fd(ctx, &req->req, fds[0]);
  74         ubus_complete_deferred_request(ctx, &req->req, 0);
  75         req->fd = fds[1];
  76
  77         req->timeout.cb = test_hello_fd_reply;
  78         test_hello_fd_reply(t);
  79 }
  80
  81 static int test_hello(struct ubus_context *ctx, struct ubus_object *obj,
  82                       struct ubus_request_data *req, const char *method,
  83                       struct blob_attr *msg)
  84 {
  85         struct hello_request *hreq;
  86         struct blob_attr *tb[__HELLO_MAX];
  87         const char format[] = "%s received a message: %s";
  88         const char *msgstr = "(unknown)";
  89
  90         blobmsg_parse(hello_policy, ARRAY_SIZE(hello_policy), tb, blob_data(msg), blob_len(msg));
  91
  92         if (tb[HELLO_MSG])
  93                 msgstr = blobmsg_data(tb[HELLO_MSG]);
  94
  95         size_t len = sizeof(*hreq) + sizeof(format) + strlen(obj->name) + strlen(msgstr) + 1;
  96         hreq = calloc(1, len);
  97         if (!hreq)
  98                 return UBUS_STATUS_UNKNOWN_ERROR;
  99
 100         snprintf(hreq->data, len, format, obj->name, msgstr);
 101         ubus_defer_request(ctx, req, &hreq->req);
 102         hreq->timeout.cb = test_hello_reply;
 103         uloop_timeout_set(&hreq->timeout, 1000);
 104
 105         return 0;
 106 }
 107
 108 enum {
 109         WATCH_ID,
 110         WATCH_COUNTER,
 111         __WATCH_MAX
 112 };
 113
 114 static const struct blobmsg_policy watch_policy[__WATCH_MAX] = {
 115         [WATCH_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
 116         [WATCH_COUNTER] = { .name = "counter", .type = BLOBMSG_TYPE_INT32 },
 117 };
 118
 119 static void
 120 test_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
 121                    uint32_t id)
 122 {
 123         fprintf(stderr, "Object %08x went away\n", id);
 124 }
 125
 126 static int
 127 test_notify(struct ubus_context *ctx, struct ubus_object *obj,
 128             struct ubus_request_data *req, const char *method,
 129             struct blob_attr *msg)
 130 {
 131 #if 0
 132         char *str;
 133
 134         str = blobmsg_format_json(msg, true);
 135         fprintf(stderr, "Received notification '%s': %s\n", method, str);
 136         free(str);
 137 #endif
 138
 139         return 0;
 140 }
 141
 142 static int test_watch(struct ubus_context *ctx, struct ubus_object *obj,
 143                       struct ubus_request_data *req, const char *method,
 144                       struct blob_attr *msg)
 145 {
 146         struct blob_attr *tb[__WATCH_MAX];
 147         int ret;
 148
 149         blobmsg_parse(watch_policy, __WATCH_MAX, tb, blob_data(msg), blob_len(msg));
 150         if (!tb[WATCH_ID])
 151                 return UBUS_STATUS_INVALID_ARGUMENT;
 152
 153         test_event.remove_cb = test_handle_remove;
 154         test_event.cb = test_notify;
 155         ret = ubus_subscribe(ctx, &test_event, blobmsg_get_u32(tb[WATCH_ID]));
 156         fprintf(stderr, "Watching object %08x: %s\n", blobmsg_get_u32(tb[WATCH_ID]), ubus_strerror(ret));
 157         return ret;
 158 }
 159
 160 enum {
 161     COUNT_TO,
 162     COUNT_STRING,
 163     __COUNT_MAX
 164 };
 165
 166 static const struct blobmsg_policy count_policy[__COUNT_MAX] = {
 167     [COUNT_TO] = { .name = "to", .type = BLOBMSG_TYPE_INT32 },
 168     [COUNT_STRING] = { .name = "string", .type = BLOBMSG_TYPE_STRING },
 169 };
 170
 171 static int test_count(struct ubus_context *ctx, struct ubus_object *obj,
 172                       struct ubus_request_data *req, const char *method,
 173                       struct blob_attr *msg)
 174 {
 175         struct blob_attr *tb[__COUNT_MAX];
 176         char *s1, *s2;
 177         uint32_t num;
 178
 179         blobmsg_parse(count_policy, __COUNT_MAX, tb, blob_data(msg), blob_len(msg));
 180         if (!tb[COUNT_TO] || !tb[COUNT_STRING])
 181                 return UBUS_STATUS_INVALID_ARGUMENT;
 182
 183         num = blobmsg_get_u32(tb[COUNT_TO]);
 184         s1 = blobmsg_get_string(tb[COUNT_STRING]);
 185         s2 = count_to_number(num);
 186         if (!s1 || !s2) {
 187                 free(s2);
 188                 return UBUS_STATUS_UNKNOWN_ERROR;
 189         }
 190         blob_buf_init(&b, 0);
 191         blobmsg_add_u32(&b, "rc", strcmp(s1, s2));
 192         ubus_send_reply(ctx, req, b.head);
 193         free(s2);
 194
 195         return 0;
 196 }
 197
 198 static const struct ubus_method test_methods[] = {
 199         UBUS_METHOD("hello", test_hello, hello_policy),
 200         UBUS_METHOD("watch", test_watch, watch_policy),
 201         UBUS_METHOD("count", test_count, count_policy),
 202 };
 203
 204 static struct ubus_object_type test_object_type =
 205         UBUS_OBJECT_TYPE("test", test_methods);
 206
 207 static struct ubus_object test_object = {
 208         .name = "test",
 209         .type = &test_object_type,
 210         .methods = test_methods,
 211         .n_methods = ARRAY_SIZE(test_methods),
 212 };
 213
 214 static void server_main(void)
 215 {
 216         int ret;
 217
 218         ret = ubus_add_object(ctx, &test_object);
 219         if (ret)
 220                 fprintf(stderr, "Failed to add object: %s\n", ubus_strerror(ret));
 221
 222         ret = ubus_register_subscriber(ctx, &test_event);
 223         if (ret)
 224                 fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 225
 226         uloop_run();
 227 }
 228
 229 int main(int argc, char **argv)
 230 {
 231         const char *ubus_socket = NULL;
 232         int ch;
 233
 234         while ((ch = getopt(argc, argv, "cs:")) != -1) {
 235                 switch (ch) {
 236                 case 's':
 237                         ubus_socket = optarg;
 238                         break;
 239                 default:
 240                         break;
 241                 }
 242         }
 243
 244         uloop_init();
 245         signal(SIGPIPE, SIG_IGN);
 246
 247         ctx = ubus_connect(ubus_socket);
 248         if (!ctx) {
 249                 fprintf(stderr, "Failed to connect to ubus\n");
 250                 return -1;
 251         }
 252
 253         ubus_add_uloop(ctx);
 254
 255         server_main();
 256
 257         ubus_free(ctx);
 258         uloop_done();
 259
 260         return 0;
 261 }