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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "lib-signals.h"
#include "llist.h"
#include "str.h"
#include "ioloop.h"
#include "ostream.h"
#include "connection.h"
#include "http-url.h"
#include "http-server.h"
#include <unistd.h>
static int fd_listen;
static struct ioloop *ioloop;
static struct io *io_listen;
static struct http_server *http_server;
static bool shut_down = FALSE;
static struct client *clients_head = NULL, *clients_tail = NULL;
struct client {
struct client *prev, *next;
struct ip_addr server_ip, ip;
in_port_t server_port, port;
struct http_server_connection *http_conn;
};
static void
client_destroy(struct client **_client, const char *reason)
{
struct client *client = *_client;
if (client->http_conn != NULL) {
/* We're not in the lib-http/server's connection destroy callback.
If at all possible, avoid destroying client objects directly.
*/
http_server_connection_close(&client->http_conn, reason);
}
DLLIST2_REMOVE(&clients_head, &clients_tail, client);
i_free(client);
if (clients_head == NULL)
io_loop_stop(ioloop);
}
/* This function just serves as an illustration of what to do when client
objects are destroyed by some actor other than lib-http/server. The best way
to close all clients is to drop the whole http-server, which will close all
connections, which in turn calls the connection_destroy() callbacks. Using a
function like this just complicates matters. */
static void
clients_destroy_all(void)
{
while (clients_head != NULL) {
struct client *client = clients_head;
client_destroy(&client, "Shutting down server");
}
}
static void
client_http_handle_request(void *context,
struct http_server_request *req)
{
struct client *client = (struct client *)context;
const struct http_request *http_req = http_server_request_get(req);
struct http_server_response *http_resp;
const char *ipport;
string_t *content;
if (strcmp(http_req->method, "GET") != 0) {
/* Unsupported method */
http_resp = http_server_response_create(req, 501, "Not Implemented");
http_server_response_add_header(http_resp, "Allow", "GET");
http_server_response_submit(http_resp);
return;
}
/* Compose response payload */
content = t_str_new(1024);
(void)net_ipport2str(&client->server_ip, client->server_port, &ipport);
str_printfa(content, "Server: %s\r\n", ipport);
(void)net_ipport2str(&client->ip, client->port, &ipport);
str_printfa(content, "Client: %s\r\n", ipport);
str_printfa(content, "Host: %s", http_req->target.url->host.name);
if (http_req->target.url->port != 0)
str_printfa(content, ":%u", http_req->target.url->port);
str_append(content, "\r\n");
switch (http_req->target.format) {
case HTTP_REQUEST_TARGET_FORMAT_ORIGIN:
case HTTP_REQUEST_TARGET_FORMAT_ABSOLUTE:
str_printfa(content, "Target: %s\r\n",
http_url_create(http_req->target.url));
break;
case HTTP_REQUEST_TARGET_FORMAT_AUTHORITY:
str_printfa(content, "Target: %s\r\n",
http_url_create_authority(http_req->target.url));
break;
case HTTP_REQUEST_TARGET_FORMAT_ASTERISK:
str_append(content, "Target: *\r\n");
break;
}
/* Just respond with the request target */
http_resp = http_server_response_create(req, 200, "OK");
http_server_response_add_header(http_resp, "Content-Type", "text/plain");
http_server_response_set_payload_data(http_resp,
str_data(content), str_len(content));
http_server_response_submit(http_resp);
}
static void
client_http_connection_destroy(void *context, const char *reason)
{
struct client *client = (struct client *)context;
if (client->http_conn == NULL) {
/* already destroying client directly */
return;
}
/* HTTP connection is destroyed already now */
client->http_conn = NULL;
/* destroy the client itself */
client_destroy(&client, reason);
}
static const struct http_server_callbacks server_callbacks = {
.handle_request = client_http_handle_request,
.connection_destroy = client_http_connection_destroy
};
static void
client_init(int fd, const struct ip_addr *ip, in_port_t port)
{
struct client *client;
struct http_request_limits req_limits;
i_zero(&req_limits);
req_limits.max_target_length = 4096;
client = i_new(struct client, 1);
client->ip = *ip;
client->port = port;
(void)net_getsockname(fd, &client->server_ip, &client->server_port);
client->http_conn = http_server_connection_create(http_server,
fd, fd, FALSE, &server_callbacks, client);
DLLIST2_APPEND(&clients_head, &clients_tail, client);
}
static void client_accept(void *context ATTR_UNUSED)
{
struct ip_addr client_ip;
in_port_t client_port;
int fd;
fd = net_accept(fd_listen, &client_ip, &client_port);
if (fd == -1)
return;
if (fd == -2)
i_fatal("accept() failed: %m");
client_init(fd, &client_ip, client_port);
}
static void
sig_die(const siginfo_t *si ATTR_UNUSED, void *context ATTR_UNUSED)
{
if (shut_down) {
i_info("Received SIGINT again - stopping immediately");
io_loop_stop(current_ioloop);
return;
}
i_info("Received SIGINT - shutting down gracefully");
shut_down = TRUE;
http_server_shut_down(http_server);
if (clients_head == NULL)
io_loop_stop(ioloop);
}
int main(int argc, char *argv[])
{
struct http_server_settings http_set;
bool debug = FALSE;
struct ip_addr my_ip;
in_port_t port;
int c;
lib_init();
while ((c = getopt(argc, argv, "D")) > 0) {
switch (c) {
case 'D':
debug = TRUE;
break;
default:
i_fatal("Usage: %s [-D] <port> [<IP>]", argv[0]);
}
}
argc -= optind;
argv += optind;
if (argc < 1 || net_str2port(argv[0], &port) < 0)
i_fatal("Port parameter missing");
if (argc < 2)
my_ip = net_ip4_any;
else if (net_addr2ip(argv[1], &my_ip) < 0)
i_fatal("Invalid IP parameter");
i_zero(&http_set);
http_set.max_client_idle_time_msecs = 20*1000; /* defaults to indefinite! */
http_set.max_pipelined_requests = 4;
http_set.debug = debug;
ioloop = io_loop_create();
http_server = http_server_init(&http_set);
lib_signals_init();
lib_signals_ignore(SIGPIPE, TRUE);
lib_signals_set_handler(SIGTERM, LIBSIG_FLAG_DELAYED, sig_die, NULL);
lib_signals_set_handler(SIGINT, LIBSIG_FLAG_DELAYED, sig_die, NULL);
fd_listen = net_listen(&my_ip, &port, 128);
if (fd_listen == -1)
i_fatal("listen(port=%u) failed: %m", port);
io_listen = io_add(fd_listen, IO_READ, client_accept, NULL);
io_loop_run(ioloop);
io_remove(&io_listen);
i_close_fd(&fd_listen);
clients_destroy_all(); /* just an example; avoid doing this */
http_server_deinit(&http_server);
lib_signals_deinit();
io_loop_destroy(&ioloop);
lib_deinit();
}
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