Update copyright dates
[src/app-framework-binder.git] / src / afb-hsrv.c
index 334b8b3..61e5c3c 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 IoT.bzh
+ * Copyright (C) 2015-2020 "IoT.bzh"
  * Author: José Bollo <jose.bollo@iot.bzh>
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
 
 #define _GNU_SOURCE
 
+#include <stdint.h>
+#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>
 #include <poll.h>
 #include <fcntl.h>
+#include <errno.h>
+#include <netdb.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 
+#include <json-c/json.h>
 #include <microhttpd.h>
+#if MHD_VERSION < 0x00095206
+# define MHD_ALLOW_SUSPEND_RESUME MHD_USE_SUSPEND_RESUME
+#endif
 
-#include "local-def.h"
 #include "afb-method.h"
+#include "afb-context.h"
+#include "afb-xreq.h"
 #include "afb-hreq.h"
 #include "afb-hsrv.h"
-#include "afb-websock.h"
-#include "afb-apis.h"
-#include "afb-req-itf.h"
+#include "afb-fdev.h"
+#include "afb-socket.h"
+
+#include "fdev.h"
 #include "verbose.h"
-#include "utils-upoll.h"
+#include "locale-root.h"
+#include "systemd.h"
+#include "jobs.h"
 
 #define JSON_CONTENT  "application/json"
 #define FORM_CONTENT  MHD_HTTP_POST_ENCODING_MULTIPART_FORMDATA
 
+struct hsrv_itf {
+       struct hsrv_itf *next;
+       struct afb_hsrv *hsrv;
+       struct fdev *fdev;
+       char uri[];
+};
 
-struct afb_hsrv_handler {
-       struct afb_hsrv_handler *next;
+struct hsrv_handler {
+       struct hsrv_handler *next;
        const char *prefix;
        size_t length;
        int (*handler) (struct afb_hreq *, void *);
@@ -49,196 +68,24 @@ struct afb_hsrv_handler {
        int priority;
 };
 
-struct afb_diralias {
-       const char *alias;
-       const char *directory;
-       size_t lendir;
-       int dirfd;
+struct hsrv_alias {
+       struct locale_root *root;
+       int relax;
 };
 
 struct afb_hsrv {
+       unsigned refcount;
+       struct hsrv_handler *handlers;
+       struct hsrv_itf *interfaces;
        struct MHD_Daemon *httpd;
-       struct afb_hsrv_handler *handlers;
-       struct upoll *upoll;
+       struct fdev *fdev;
+       char *cache_to;
 };
 
-static struct upoll *upoll = NULL;
-
-static struct afb_hsrv_handler *new_handler(
-               struct afb_hsrv_handler *head,
-               const char *prefix,
-               int (*handler) (struct afb_hreq *, void *),
-               void *data,
-               int priority)
-{
-       struct afb_hsrv_handler *link, *iter, *previous;
-       size_t length;
-
-       /* get the length of the prefix without its leading / */
-       length = strlen(prefix);
-       while (length && prefix[length - 1] == '/')
-               length--;
-
-       /* allocates the new link */
-       link = malloc(sizeof *link);
-       if (link == NULL)
-               return NULL;
-
-       /* initialize it */
-       link->prefix = prefix;
-       link->length = length;
-       link->handler = handler;
-       link->data = data;
-       link->priority = priority;
-
-       /* adds it */
-       previous = NULL;
-       iter = head;
-       while (iter && (priority < iter->priority || (priority == iter->priority && length <= iter->length))) {
-               previous = iter;
-               iter = iter->next;
-       }
-       link->next = iter;
-       if (previous == NULL)
-               return link;
-       previous->next = link;
-       return head;
-}
-
-int afb_hsrv_add_handler(
-               AFB_session * session,
-               const char *prefix,
-               int (*handler) (struct afb_hreq *, void *),
-               void *data,
-               int priority)
-{
-       struct afb_hsrv_handler *head;
-
-       head = new_handler(session->handlers, prefix, handler, data, priority);
-       if (head == NULL)
-               return 0;
-       session->handlers = head;
-       return 1;
-}
-
-int afb_hreq_one_page_api_redirect(
-               struct afb_hreq *hreq,
-               void *data)
-{
-       size_t plen;
-       char *url;
-
-       if (hreq->lentail >= 2 && hreq->tail[1] == '#')
-               return 0;
-       /*
-        * Here we have for example:
-        *    url  = "/pre/dir/page"   lenurl = 13
-        *    tail =     "/dir/page"   lentail = 9
-        *
-        * We will produce "/pre/#!dir/page"
-        *
-        * Let compute plen that include the / at end (for "/pre/")
-        */
-       plen = hreq->lenurl - hreq->lentail + 1;
-       url = alloca(hreq->lenurl + 3);
-       memcpy(url, hreq->url, plen);
-       url[plen++] = '#';
-       url[plen++] = '!';
-       memcpy(&url[plen], &hreq->tail[1], hreq->lentail);
-       return afb_hreq_redirect_to(hreq, url);
-}
-
-static int afb_hreq_websocket_switch(struct afb_hreq *hreq, void *data)
-{
-       int later;
-
-       afb_hreq_context(hreq);
-       if (hreq->lentail != 0 || !afb_websock_check(hreq, &later))
-               return 0;
-
-       if (!later) {
-               struct afb_websock *ws = afb_websock_create(hreq);
-               if (ws != NULL)
-                       hreq->upgrade = 1;
-       }
-       return 1;
-}
-
-static int afb_hreq_rest_api(struct afb_hreq *hreq, void *data)
-{
-       const char *api, *verb;
-       size_t lenapi, lenverb;
-       struct AFB_clientCtx *context;
-
-       api = &hreq->tail[strspn(hreq->tail, "/")];
-       lenapi = strcspn(api, "/");
-       verb = &api[lenapi];
-       verb = &verb[strspn(verb, "/")];
-       lenverb = strcspn(verb, "/");
-
-       if (!(*api && *verb && lenapi && lenverb))
-               return 0;
-
-       context = afb_hreq_context(hreq);
-       return afb_apis_handle(afb_hreq_to_req(hreq), context, api, lenapi, verb, lenverb);
-}
-
-static int handle_alias(struct afb_hreq *hreq, void *data)
-{
-       struct afb_diralias *da = data;
-
-       if (hreq->method != afb_method_get) {
-               afb_hreq_reply_error(hreq, MHD_HTTP_METHOD_NOT_ALLOWED);
-               return 1;
-       }
-
-       if (!afb_hreq_valid_tail(hreq)) {
-               afb_hreq_reply_error(hreq, MHD_HTTP_FORBIDDEN);
-               return 1;
-       }
-
-       return afb_hreq_reply_file(hreq, da->dirfd, &hreq->tail[1]);
-}
-
-int afb_hsrv_add_alias(AFB_session * session, const char *prefix, const char *alias, int priority)
+static void reply_error(struct MHD_Connection *connection, unsigned int status)
 {
-       struct afb_diralias *da;
-       int dirfd;
-
-       dirfd = open(alias, O_PATH|O_DIRECTORY);
-       if (dirfd < 0) {
-               /* TODO message */
-               return 0;
-       }
-       da = malloc(sizeof *da);
-       if (da != NULL) {
-               da->alias = prefix;
-               da->directory = alias;
-               da->lendir = strlen(da->directory);
-               da->dirfd = dirfd;
-               if (afb_hsrv_add_handler(session, prefix, handle_alias, da, priority))
-                       return 1;
-               free(da);
-       }
-       close(dirfd);
-       return 0;
-}
-
-void afb_hsrv_reply_error(struct MHD_Connection *connection, unsigned int status)
-{
-       char *buffer;
-       int length;
-       struct MHD_Response *response;
-
-       length = asprintf(&buffer, "<html><body>error %u</body></html>", status);
-       if (length > 0)
-               response = MHD_create_response_from_buffer((unsigned)length, buffer, MHD_RESPMEM_MUST_FREE);
-       else {
-               buffer = "<html><body>error</body></html>";
-               response = MHD_create_response_from_buffer(strlen(buffer), buffer, MHD_RESPMEM_PERSISTENT);
-       }
-       if (!MHD_queue_response(connection, status, response))
-               fprintf(stderr, "Failed to reply error code %u", status);
+       struct MHD_Response *response = MHD_create_response_from_buffer(0, NULL, MHD_RESPMEM_PERSISTENT);
+       MHD_queue_response(connection, status, response);
        MHD_destroy_response(response);
 }
 
@@ -272,32 +119,41 @@ static int access_handler(
        int rc;
        struct afb_hreq *hreq;
        enum afb_method method;
-       AFB_session *session;
-       struct afb_hsrv_handler *iter;
+       struct afb_hsrv *hsrv;
+       struct hsrv_handler *iter;
        const char *type;
+       enum json_tokener_error jerr;
 
-       session = cls;
+       hsrv = cls;
        hreq = *recordreq;
        if (hreq == NULL) {
-               /* create the request */
-               hreq = calloc(1, sizeof *hreq);
-               if (hreq == NULL)
-                       goto internal_error;
-               *recordreq = hreq;
-
                /* get the method */
                method = get_method(methodstr);
                method &= afb_method_get | afb_method_post;
-               if (method == afb_method_none)
-                       goto bad_request;
+               if (method == afb_method_none) {
+                       WARNING("Unsupported HTTP operation %s", methodstr);
+                       reply_error(connection, MHD_HTTP_BAD_REQUEST);
+                       return MHD_YES;
+               }
+
+               /* create the request */
+               hreq = afb_hreq_create();
+               if (hreq == NULL) {
+                       ERROR("Can't allocate 'hreq'");
+                       reply_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR);
+                       return MHD_YES;
+               }
 
                /* init the request */
-               hreq->session = cls;
+               hreq->hsrv = hsrv;
+               hreq->cacheTimeout = hsrv->cache_to;
                hreq->connection = connection;
                hreq->method = method;
                hreq->version = version;
+               hreq->lang = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_ACCEPT_LANGUAGE);
                hreq->tail = hreq->url = url;
                hreq->lentail = hreq->lenurl = strlen(url);
+               *recordreq = hreq;
 
                /* init the post processing */
                if (method == afb_method_post) {
@@ -307,11 +163,21 @@ static int access_handler(
                                hreq->method = afb_method_get;
                        } else if (strcasestr(type, FORM_CONTENT) != NULL) {
                                hreq->postform = MHD_create_post_processor (connection, 65500, postproc, hreq);
-                               if (hreq->postform == NULL)
-                                       goto internal_error;
+                               if (hreq->postform == NULL) {
+                                       ERROR("Can't create POST processor");
+                                       afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
+                               }
                                return MHD_YES;
-                       } else if (strcasestr(type, JSON_CONTENT) == NULL) {
-                               afb_hsrv_reply_error(connection, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE);
+                       } else if (strcasestr(type, JSON_CONTENT) != NULL) {
+                               hreq->tokener = json_tokener_new();
+                               if (hreq->tokener == NULL) {
+                                       ERROR("Can't create tokener for POST");
+                                       afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
+                               }
+                               return MHD_YES;
+                        } else {
+                               WARNING("Unsupported media type %s", type);
+                               afb_hreq_reply_error(hreq, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE);
                                return MHD_YES;
                        }
                }
@@ -320,30 +186,63 @@ static int access_handler(
        /* process further data */
        if (*upload_data_size) {
                if (hreq->postform != NULL) {
-                       if (!MHD_post_process (hreq->postform, upload_data, *upload_data_size))
-                               goto internal_error;
-               } else {
-                       if (!afb_hreq_post_add(hreq, NULL, upload_data, *upload_data_size))
-                               goto internal_error;
+                       if (!MHD_post_process (hreq->postform, upload_data, *upload_data_size)) {
+                               ERROR("error in POST processor");
+                               afb_hreq_reply_error(hreq, MHD_HTTP_INTERNAL_SERVER_ERROR);
+                               return MHD_YES;
+                       }
+               } else if (hreq->tokener) {
+                       hreq->json = json_tokener_parse_ex(hreq->tokener, upload_data, (int)*upload_data_size);
+                       jerr = json_tokener_get_error(hreq->tokener);
+                       if (jerr == json_tokener_continue) {
+                               hreq->json = json_tokener_parse_ex(hreq->tokener, "", 1);
+                               jerr = json_tokener_get_error(hreq->tokener);
+                       }
+                       if (jerr != json_tokener_success) {
+                               ERROR("error in POST json: %s", json_tokener_error_desc(jerr));
+                               afb_hreq_reply_error(hreq, MHD_HTTP_BAD_REQUEST);
+                               return MHD_YES;
+                       }
                }
                *upload_data_size = 0;
-               return MHD_YES;         
+               return MHD_YES;
        }
 
        /* flush the data */
        if (hreq->postform != NULL) {
                rc = MHD_destroy_post_processor(hreq->postform);
                hreq->postform = NULL;
-               if (rc == MHD_NO)
-                       goto bad_request;
+               if (rc == MHD_NO) {
+                       ERROR("error detected in POST processing");
+                       afb_hreq_reply_error(hreq, MHD_HTTP_BAD_REQUEST);
+                       return MHD_YES;
+               }
+       }
+       if (hreq->tokener != NULL) {
+               json_tokener_free(hreq->tokener);
+               hreq->tokener = NULL;
+       }
+
+       if (hreq->scanned != 0) {
+               if (hreq->replied == 0 && hreq->suspended == 0) {
+                       MHD_suspend_connection (connection);
+                       hreq->suspended = 1;
+               }
+               return MHD_YES;
        }
 
        /* search an handler for the request */
-       iter = session->handlers;
+       hreq->scanned = 1;
+       iter = hsrv->handlers;
        while (iter) {
                if (afb_hreq_unprefix(hreq, iter->prefix, iter->length)) {
-                       if (iter->handler(hreq, iter->data))
+                       if (iter->handler(hreq, iter->data)) {
+                               if (hreq->replied == 0 && hreq->suspended == 0) {
+                                       MHD_suspend_connection (connection);
+                                       hreq->suspended = 1;
+                               }
                                return MHD_YES;
+                       }
                        hreq->tail = hreq->url;
                        hreq->lentail = hreq->lenurl;
                }
@@ -351,16 +250,9 @@ static int access_handler(
        }
 
        /* no handler */
+       NOTICE("Unhandled request to %s", hreq->url);
        afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
        return MHD_YES;
-
-bad_request:
-       afb_hsrv_reply_error(connection, MHD_HTTP_BAD_REQUEST);
-       return MHD_YES;
-
-internal_error:
-       afb_hsrv_reply_error(connection, MHD_HTTP_INTERNAL_SERVER_ERROR);
-       return MHD_YES;
 }
 
 /* Because of POST call multiple time requestApi we need to free POST handle here */
@@ -370,9 +262,32 @@ static void end_handler(void *cls, struct MHD_Connection *connection, void **rec
        struct afb_hreq *hreq;
 
        hreq = *recordreq;
-       if (hreq->upgrade)
-               MHD_suspend_connection (connection);
-       afb_hreq_free(hreq);
+       if (hreq) {
+               afb_hreq_unref(hreq);
+       }
+}
+
+static void do_run(int signum, void *arg)
+{
+       MHD_UNSIGNED_LONG_LONG to;
+       struct afb_hsrv *hsrv = arg;
+
+       if (!signum) {
+               do { MHD_run(hsrv->httpd); } while(MHD_get_timeout(hsrv->httpd, &to) == MHD_YES && !to);
+       }
+       fdev_set_events(hsrv->fdev, EPOLLIN);
+}
+
+void afb_hsrv_run(struct afb_hsrv *hsrv)
+{
+       fdev_set_events(hsrv->fdev, 0);
+       if (jobs_queue(hsrv, 0, do_run, hsrv) < 0)
+               do_run(0, hsrv);
+}
+
+static void listen_callback(void *hsrv, uint32_t revents, struct fdev *fdev)
+{
+       afb_hsrv_run(hsrv);
 }
 
 static int new_client_handler(void *cls, const struct sockaddr *addr, socklen_t addrlen)
@@ -380,90 +295,298 @@ static int new_client_handler(void *cls, const struct sockaddr *addr, socklen_t
        return MHD_YES;
 }
 
-static int my_default_init(AFB_session * session)
+static struct hsrv_handler *new_handler(
+               struct hsrv_handler *head,
+               const char *prefix,
+               int (*handler) (struct afb_hreq *, void *),
+               void *data,
+               int priority)
 {
-       int idx;
+       struct hsrv_handler *link, *iter, *previous;
+       size_t length;
 
-       if (!afb_hsrv_add_handler(session, session->config->rootapi, afb_hreq_websocket_switch, NULL, 20))
-               return 0;
+       /* get the length of the prefix without its leading / */
+       length = strlen(prefix);
+       while (length && prefix[length - 1] == '/')
+               length--;
 
-       if (!afb_hsrv_add_handler(session, session->config->rootapi, afb_hreq_rest_api, NULL, 10))
-               return 0;
+       /* allocates the new link */
+       link = malloc(sizeof *link);
+       if (link == NULL)
+               return NULL;
 
-       for (idx = 0; session->config->aliasdir[idx].url != NULL; idx++)
-               if (!afb_hsrv_add_alias (session, session->config->aliasdir[idx].url, session->config->aliasdir[idx].path, 0))
-                       return 0;
+       /* initialize it */
+       link->prefix = prefix;
+       link->length = length;
+       link->handler = handler;
+       link->data = data;
+       link->priority = priority;
 
-       if (!afb_hsrv_add_alias(session, "", session->config->rootdir, -10))
-               return 0;
+       /* adds it */
+       previous = NULL;
+       iter = head;
+       while (iter && (priority < iter->priority || (priority == iter->priority && length <= iter->length))) {
+               previous = iter;
+               iter = iter->next;
+       }
+       link->next = iter;
+       if (previous == NULL)
+               return link;
+       previous->next = link;
+       return head;
+}
 
-       if (!afb_hsrv_add_handler(session, session->config->rootbase, afb_hreq_one_page_api_redirect, NULL, -20))
-               return 0;
+static int handle_alias(struct afb_hreq *hreq, void *data)
+{
+       int rc;
+       struct hsrv_alias *da = data;
+       struct locale_search *search;
+
+       if (hreq->method != afb_method_get) {
+               if (da->relax)
+                       return 0;
+               afb_hreq_reply_error(hreq, MHD_HTTP_METHOD_NOT_ALLOWED);
+               return 1;
+       }
 
+       search = locale_root_search(da->root, hreq->lang, 0);
+       rc = afb_hreq_reply_locale_file_if_exist(hreq, search, &hreq->tail[1]);
+       locale_search_unref(search);
+       if (rc == 0) {
+               if (da->relax)
+                       return 0;
+               afb_hreq_reply_error(hreq, MHD_HTTP_NOT_FOUND);
+       }
        return 1;
 }
 
-/* infinite loop */
-static void hsrv_handle_event(struct MHD_Daemon *httpd)
+int afb_hsrv_add_handler(
+               struct afb_hsrv *hsrv,
+               const char *prefix,
+               int (*handler) (struct afb_hreq *, void *),
+               void *data,
+               int priority)
 {
-       MHD_run(httpd);
+       struct hsrv_handler *head;
+
+       head = new_handler(hsrv->handlers, prefix, handler, data, priority);
+       if (head == NULL)
+               return 0;
+       hsrv->handlers = head;
+       return 1;
 }
 
-int afb_hsrv_start(AFB_session * session)
+int afb_hsrv_add_alias_root(struct afb_hsrv *hsrv, const char *prefix, struct locale_root *root, int priority, int relax)
 {
-       struct MHD_Daemon *httpd;
-       const union MHD_DaemonInfo *info;
+       struct hsrv_alias *da;
 
-       if (!my_default_init(session)) {
-               printf("Error: initialisation of httpd failed");
-               return 0;
+       da = malloc(sizeof *da);
+       if (da != NULL) {
+               da->root = root;
+               da->relax = relax;
+               if (afb_hsrv_add_handler(hsrv, prefix, handle_alias, da, priority)) {
+                       locale_root_addref(root);
+                       return 1;
+               }
+               free(da);
        }
+       return 0;
+}
+
+int afb_hsrv_add_alias(struct afb_hsrv *hsrv, const char *prefix, int dirfd, const char *alias, int priority, int relax)
+{
+       struct locale_root *root;
+       int rc;
 
-       if (verbosity) {
-               printf("AFB:notice Waiting port=%d rootdir=%s\n", session->config->httpdPort, session->config->rootdir);
-               printf("AFB:notice Browser URL= http:/*localhost:%d\n", session->config->httpdPort);
+       root = locale_root_create_at(dirfd, alias);
+       if (root == NULL) {
+               ERROR("can't connect to directory %s: %m", alias);
+               rc = 0;
+       } else {
+               rc = afb_hsrv_add_alias_root(hsrv, prefix, root, priority, relax);
+               locale_root_unref(root);
        }
+       return rc;
+}
+
+int afb_hsrv_set_cache_timeout(struct afb_hsrv *hsrv, int duration)
+{
+       int rc;
+       char *dur;
+
+       rc = asprintf(&dur, "%d", duration);
+       if (rc < 0)
+               return 0;
+
+       free(hsrv->cache_to);
+       hsrv->cache_to = dur;
+       return 1;
+}
+
+int afb_hsrv_start(struct afb_hsrv *hsrv, unsigned int connection_timeout)
+{
+       struct fdev *fdev;
+       struct MHD_Daemon *httpd;
+       const union MHD_DaemonInfo *info;
 
        httpd = MHD_start_daemon(
-               MHD_USE_EPOLL_LINUX_ONLY | MHD_USE_TCP_FASTOPEN | MHD_USE_DEBUG | MHD_USE_SUSPEND_RESUME,
-               (uint16_t) session->config->httpdPort,  /* port */
-               new_client_handler, NULL,       /* Tcp Accept call back + extra attribute */
-               access_handler, session,        /* Http Request Call back + extra attribute */
-               MHD_OPTION_NOTIFY_COMPLETED, end_handler, session,
-               MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int)15,        /* 15 seconds */
-               MHD_OPTION_END);        /* options-end */
+                       MHD_USE_EPOLL
+                       | MHD_ALLOW_UPGRADE
+                       | MHD_USE_TCP_FASTOPEN
+                       | MHD_USE_NO_LISTEN_SOCKET
+                       | MHD_USE_DEBUG
+                       | MHD_ALLOW_SUSPEND_RESUME,
+                       0,                              /* port */
+                       new_client_handler, NULL,       /* Tcp Accept call back + extra attribute */
+                       access_handler, hsrv,   /* Http Request Call back + extra attribute */
+                       MHD_OPTION_NOTIFY_COMPLETED, end_handler, hsrv,
+                       MHD_OPTION_CONNECTION_TIMEOUT, connection_timeout,
+                       MHD_OPTION_END);        /* options-end */
 
        if (httpd == NULL) {
-               printf("Error: httpStart invalid httpd port: %d", session->config->httpdPort);
+               ERROR("httpStart invalid httpd");
                return 0;
        }
 
-       info = MHD_get_daemon_info(httpd, MHD_DAEMON_INFO_EPOLL_FD_LINUX_ONLY);
+       info = MHD_get_daemon_info(httpd, MHD_DAEMON_INFO_EPOLL_FD);
        if (info == NULL) {
                MHD_stop_daemon(httpd);
-               fprintf(stderr, "Error: httpStart no pollfd");
+               ERROR("httpStart no pollfd");
                return 0;
        }
 
-       upoll = upoll_open(info->listen_fd, httpd);
-       if (upoll == NULL) {
+       fdev = afb_fdev_create(info->epoll_fd);
+       if (fdev == NULL) {
                MHD_stop_daemon(httpd);
-               fprintf(stderr, "Error: connection to upoll of httpd failed");
+               ERROR("connection to events for httpd failed");
                return 0;
        }
-       upoll_on_readable(upoll, (void*)hsrv_handle_event);
+       fdev_set_autoclose(fdev, 0);
+       fdev_set_events(fdev, EPOLLIN);
+       fdev_set_callback(fdev, listen_callback, hsrv);
+
+       hsrv->httpd = httpd;
+       hsrv->fdev = fdev;
+       return 1;
+}
+
+void afb_hsrv_stop(struct afb_hsrv *hsrv)
+{
+       if (hsrv->fdev != NULL) {
+               fdev_unref(hsrv->fdev);
+               hsrv->fdev = NULL;
+       }
+       if (hsrv->httpd != NULL)
+               MHD_stop_daemon(hsrv->httpd);
+       hsrv->httpd = NULL;
+}
+
+struct afb_hsrv *afb_hsrv_create()
+{
+       struct afb_hsrv *result = calloc(1, sizeof(struct afb_hsrv));
+       if (result != NULL)
+               result->refcount = 1;
+       return result;
+}
+
+void afb_hsrv_put(struct afb_hsrv *hsrv)
+{
+       assert(hsrv->refcount != 0);
+       if (!--hsrv->refcount) {
+               afb_hsrv_stop(hsrv);
+               free(hsrv);
+       }
+}
 
-       session->httpd = httpd;
+static int hsrv_itf_connect(struct hsrv_itf *itf);
+
+static void hsrv_itf_callback(void *closure, uint32_t revents, struct fdev *fdev)
+{
+       struct hsrv_itf *itf = closure;
+       int fd, sts;
+       struct sockaddr addr;
+       socklen_t lenaddr;
+
+       if ((revents & EPOLLHUP) != 0) {
+               ERROR("disconnection for server %s: %m", itf->uri);
+               hsrv_itf_connect(itf);
+               fdev_unref(fdev);
+       } else if ((revents & EPOLLIN) != 0) {
+               lenaddr = (socklen_t)sizeof addr;
+               fd = accept(fdev_fd(fdev), &addr, &lenaddr);
+               if (fd < 0)
+                       ERROR("can't accept connection to %s: %m", itf->uri);
+               else {
+                       sts = MHD_add_connection(itf->hsrv->httpd, fd, &addr, lenaddr);
+                       if (sts != MHD_YES) {
+                               ERROR("can't add incoming connection to %s: %m", itf->uri);
+                               close(fd);
+                       }
+               }
+       }
+}
+
+static int hsrv_itf_connect(struct hsrv_itf *itf)
+{
+       struct sockaddr addr;
+       socklen_t lenaddr;
+       char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
+       int rgni;
+
+       itf->fdev = afb_socket_open_fdev_scheme(itf->uri, 1, "tcp");
+       if (!itf->fdev) {
+               ERROR("can't create socket %s", itf->uri);
+               return 0;
+       }
+       fdev_set_events(itf->fdev, EPOLLIN);
+       fdev_set_callback(itf->fdev, hsrv_itf_callback, itf);
+       memset(&addr, 0, sizeof addr);
+       lenaddr = (socklen_t)sizeof addr;
+       getsockname(fdev_fd(itf->fdev), &addr, &lenaddr);
+       if (addr.sa_family == AF_INET && !((struct sockaddr_in*)&addr)->sin_addr.s_addr) {
+               strncpy(hbuf, "*", NI_MAXHOST);
+               sprintf(sbuf, "%d", (int)ntohs(((struct sockaddr_in*)&addr)->sin_port));
+       } else {
+               rgni = getnameinfo(&addr, lenaddr, hbuf, sizeof hbuf, sbuf, sizeof sbuf, NI_NUMERICSERV);
+               if (rgni != 0) {
+                       ERROR("getnameinfo returned %d: %s", rgni, gai_strerror(rgni));
+                       hbuf[0] = sbuf[0] = '?';
+                       hbuf[1] = sbuf[1] = 0;
+               }
+       }
+       NOTICE("Listening interface %s:%s", hbuf, sbuf);
        return 1;
 }
 
-void afb_hsrv_stop(AFB_session * session)
+int afb_hsrv_add_interface(struct afb_hsrv *hsrv, const char *uri)
 {
-       if (upoll)
-               upoll_close(upoll);
-       upoll = NULL;
-       if (session->httpd != NULL)
-               MHD_stop_daemon(session->httpd);
-       session->httpd = NULL;
+       struct hsrv_itf *itf;
+
+       itf = malloc(sizeof *itf + 1 + strlen(uri));
+       if (itf == NULL)
+               return -1;
+
+       itf->hsrv = hsrv;
+       itf->fdev = NULL;
+       strcpy(itf->uri, uri);
+       itf->next = hsrv->interfaces;
+       hsrv->interfaces = itf;
+       return hsrv_itf_connect(itf);
 }
 
+int afb_hsrv_add_interface_tcp(struct afb_hsrv *hsrv, const char *itf, uint16_t port)
+{
+       int rc;
+       char buffer[1024];
+
+       if (itf == NULL) {
+               itf = "*"; /* awaiting getifaddrs impl */
+       }
+       rc = snprintf(buffer, sizeof buffer, "tcp:%s:%d", itf, (int)port);
+       if (rc < 0 || rc >= (int)sizeof buffer) {
+               if (rc > 0)
+                       errno = EINVAL;
+               return 0;
+       }
+       return afb_hsrv_add_interface(hsrv, buffer);
+}