IWNET

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Pure C asynchronous HTTP framework providing websockets client/server, SSL, reverse proxy and routing.

Works on Linux, macOS, FreeBSD

• Fast asynchronous HTTP server (iwn_http_server.h)
• Web framework based on HTTP server (iwn_wf.h)
• Ultra fast HTTP Reverse Proxy (iwn_http_server.h)
• Websocket client and server (iwn_ws_server.h, iwn_ws_client.h)
• Poller reactor (iwn_poller.h)
• SSL Layer is based on BearSSL (iwn_brssl_poller_adapter.h)
• Manager of child processes (iwn_proc.h)
• Timer (iwn_scheduler.h)
• Inotify watcher wrapper iwn_watcher

Build from sources

Prerequisites

• Linux, macOS or FreeBSD
• CMake 3.12 or greater
• gcc or clang compiler
• GNU Make or Ninja

Building

git clone https://github.com/Softmotions/iwnet.git

mkdir -p ./iwnet/build && cd ./iwnet/build

cmake .. -DCMAKE_BUILD_TYPE=RelWithDebInfo -DBUILD_EXAMPLES=ON

make 

IWSTART

IWSTART is an automatic CMake initial project generator for C projects based on iowow / iwnet / ejdb2 libs.

https://github.com/Softmotions/iwstart

Used by

• EJDB2 Embeddable JSON Database engine
• Wirow Video Conferencing Platform

Asynchronous HTTP Framework

Examples

Simple echo server

  ./echo_http_server --ssl
 
  curl -k -XPUT -d'Hello' https://localhost:8080/echo
  Hello
  I'm an echo web server

echo_http_server.c

#include "iwn_wf.h"

#include <iowow/iwconv.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <errno.h>

static struct iwn_poller *poller;
static struct iwn_wf_ctx *ctx;

static void _on_signal(int signo) {
  fprintf(stderr, "\nExiting...\n");
  iwn_poller_shutdown_request(poller);
}

static int _handle_echo(struct iwn_wf_req *req, void *user_data) {
  fprintf(stderr, "Echo handler called\n");
  iwn_http_response_printf(req->http, 200, "text/plain", "%.*s\n%s\n",
                           (int) req->body_len, req->body, (char*) user_data);
  return IWN_WF_RES_PROCESSED;
}

int main(int argc, char *argv[]) {
  signal(SIGPIPE, SIG_IGN);
  if (  signal(SIGTERM, _on_signal) == SIG_ERR
     || signal(SIGINT, _on_signal) == SIG_ERR) {
    return EXIT_FAILURE;
  }

  iwrc rc = 0;
  bool ssl = false;
  int port = 8080;

  for (int i = 1; i < argc; ++i) {
    if (strcmp(argv[i], "--ssl") == 0) {
      ssl = true;
    } else if (strcmp(argv[i], "--port") == 0 && i + 1 < argc) {
      port = iwatoi(argv[i + 1]);
    }
  }
  RCC(rc, finish, iw_init());              // Init iowow runtime, logging, etc..
  RCC(rc, finish, iwn_wf_create(0, &ctx)); // Create web server context
  RCC(rc, finish, iwn_wf_route(&(struct iwn_wf_route) {
    .ctx = ctx,
    .pattern = "/echo",
    .handler = _handle_echo,
    .user_data = "I'm an echo web server",
    .flags = IWN_WF_PUT | IWN_WF_POST
  }, 0));

  RCC(rc, finish, iwn_poller_create(0, 0, &poller));

  struct iwn_wf_server_spec spec = {
    .listen = "localhost",
    .port   = port,
    .poller = poller,
  };
  if (ssl) {
    spec.ssl.private_key = "./server-eckey.pem";
    spec.ssl.private_key_len = -1;
    spec.ssl.certs = "./server-ecdsacert.pem";
    spec.ssl.certs_len = -1;
  }

  // Print out a routes configuration.
  iwn_wf_route_print(ctx->root, stderr);
  // Configure HTTP server.
  RCC(rc, finish, iwn_wf_server(&spec, ctx));
  fprintf(stderr,
          "\nOpen terminal and run:\n\tcurl -k -XPUT -d'Hello' %s://%s:%d\n",
          (ssl ? "https" : "http"),
          spec.listen,
          spec.port);

  // Start fds poller reactor.
  iwn_poller_poll(poller);

finish:
  iwn_poller_destroy(&poller);
  if (rc) {
    iwlog_ecode_error3(rc);
    return EXIT_FAILURE;
  } else {
    return EXIT_SUCCESS;
  }
}

Todo list REST API server

todolist_http_server.c

./todolist_http_server --ssl
0001 [root:*] 
0002   [/todo> ALL
0003     {create:/([a-zA-z]+[a-z0-9A-Z]*)] PUT
0004     {get:/([0-9]+)] GET
0005     {remove:/([0-9]+)] DELETE
0006     [list:*] GET
0007     [done:*] POST

 Create a new 'Hello' todo entry:
	curl -k -XPUT -d'Say Hello' https://localhost:8080/todo/Hello
	curl -k -XPUT -d'Say Hello' https://localhost:8080/todo/Hello?done=1

 List all todo list items:
	curl -k https://localhost:8080/todo

 Get task #1 details:
	curl -k https://localhost:8080/todo/1

 Remove task #2 from todo list:
	curl -k -XDELETE https://localhost:8080/todo/2

 Update done status of task #2:
	curl -k -XPOST -d'id=2&done=1' https://localhost:8080/todo

More examples

Real life large project - Wirow video-conferencing server

You may find many helpful code examples by looking into framework test code

• server2.c
• server1.c
• HTTP Proxy: proxy1.c

License

MIT License

Copyright (c) 2012-2024 Softmotions Ltd <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.