--- /dev/null
+/*
+
+ silchttpserver.c
+
+ Author: Pekka Riikonen <priikone@silcnet.org>
+
+ Copyright (C) 2006 Pekka Riikonen
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+*/
+
+#include "silc.h"
+#include "silchttpserver.h"
+
+/************************** Types and definitions ***************************/
+
+#define SILC_HTTP_SERVER_TIMEOUT 120 /* Connection timeout */
+#define SILC_HTTP_SERVER_CONNS 2 /* Default number of connections */
+#define SILC_HTTP_SERVER_BUFLEN 1024 /* Default data buffer length */
+#define SILC_HTTP_SERVER_HEADER "HTTP/1.1 200 OK\r\nServer: SILCHTTP/1.0\r\n"
+
+/* HTTP server context */
+struct SilcHttpServerStruct {
+ SilcNetListener listener; /* Server listener */
+ SilcSchedule schedule; /* Scheduler */
+ SilcList allconns; /* All connections */
+ SilcList conns; /* Connection free list */
+ SilcHttpServerCallback callback; /* Requset callback */
+ void *context; /* Request callback context */
+};
+
+/* HTTP connection context */
+struct SilcHttpConnectionStruct {
+ struct SilcHttpConnectionStruct *next;
+ SilcHttpServer httpd; /* Server */
+ SilcStream stream; /* Connection stream */
+ SilcBuffer inbuf; /* Read data buffer */
+ SilcBuffer outbuf; /* Write data buffer */
+ SilcInt64 touched; /* Time last connection was touched */
+ SilcMime curheaders; /* HTTP request headers */
+ SilcMime headers; /* HTTP reply headers */
+ unsigned int keepalive : 1; /* Keep alive */
+};
+
+/************************ Static utility functions **************************/
+
+/* Close HTTP connection */
+
+static void silc_http_server_close_connection(SilcHttpConnection conn)
+{
+ if (conn->headers) {
+ silc_mime_free(conn->headers);
+ conn->headers = NULL;
+ }
+ if (conn->curheaders) {
+ silc_mime_free(conn->curheaders);
+ conn->curheaders = NULL;
+ }
+ silc_buffer_clear(conn->inbuf);
+ silc_buffer_clear(conn->outbuf);
+ silc_buffer_reset(conn->inbuf);
+ silc_buffer_reset(conn->outbuf);
+
+ if (conn->keepalive)
+ return;
+
+ SILC_LOG_DEBUG(("Closing HTTP connection"));
+
+ silc_schedule_task_del_by_context(conn->httpd->schedule, conn);
+ silc_stream_destroy(conn->stream);
+
+ /* Add to free list */
+ silc_list_add(conn->httpd->conns, conn);
+}
+
+/* Parse HTTP data */
+
+static SilcBool silc_http_server_parse(SilcHttpServer httpd,
+ SilcHttpConnection conn)
+{
+ SilcUInt32 data_len;
+ unsigned char *data, *tmp;
+ char *method, *uri;
+ const char *value;
+ SilcBufferStruct postdata;
+
+ SILC_LOG_DEBUG(("Parsing HTTP data"));
+ SILC_LOG_HEXDUMP(("HTTP data"), silc_buffer_data(conn->inbuf),
+ silc_buffer_len(conn->inbuf));
+
+ data = silc_buffer_data(conn->inbuf);
+ data_len = silc_buffer_len(conn->inbuf);
+
+ if (data_len < 3)
+ return TRUE;
+
+ tmp = memchr(data, '\n', data_len);
+ if (!tmp || tmp[-1] != '\r') {
+ if (data_len < SILC_HTTP_SERVER_BUFLEN)
+ return TRUE;
+ return FALSE;
+ }
+ *tmp = 0;
+
+ /* Get method */
+ if (strchr(data, ' '))
+ *strchr(data, ' ') = 0;
+ method = data;
+ SILC_LOG_DEBUG(("Method: '%s'", method));
+
+ /* Get URI */
+ tmp = memchr(data, '\0', data_len);
+ if (!tmp) {
+ if (data_len < SILC_HTTP_SERVER_BUFLEN)
+ return TRUE;
+ return FALSE;
+ }
+ tmp++;
+ if (strchr(tmp, ' '))
+ *strchr(tmp, ' ') = 0;
+ uri = tmp;
+ SILC_LOG_DEBUG(("URI: '%s'", uri));
+
+ /* Get HTTP headers */
+ tmp++;
+ tmp = memchr(tmp, '\n', data_len - (tmp - data)) + 1;
+ if (!tmp) {
+ if (data_len < SILC_HTTP_SERVER_BUFLEN)
+ return TRUE;
+ return FALSE;
+ }
+ conn->curheaders = silc_mime_decode(NULL, tmp, data_len - (tmp - data));
+ if (!conn->curheaders) {
+ if (data_len < SILC_HTTP_SERVER_BUFLEN)
+ return TRUE;
+ return FALSE;
+ }
+
+ /* Check for persistent connection */
+ value = silc_mime_get_field(conn->curheaders, "Keep-alive");
+ if (value)
+ conn->keepalive = TRUE;
+ value = silc_mime_get_field(conn->curheaders, "Connection");
+ if (value && !strcasecmp(value, "keep-alive"))
+ conn->keepalive = TRUE;
+ if (value && !strcasecmp(value, "close"))
+ conn->keepalive = FALSE;
+
+ /* Deliver request to caller */
+ if (!strcasecmp(method, "GET") || !strcasecmp(method, "HEAD")) {
+ /* Send request to caller */
+ httpd->callback(httpd, conn, uri, method, NULL, httpd->context);
+
+ } else if (!strcasecmp(method, "POST")) {
+ /* Get POST data */
+ tmp = (unsigned char *)silc_mime_get_data(conn->curheaders, &data_len);
+ if (!tmp) {
+ silc_mime_free(conn->curheaders);
+ conn->curheaders = NULL;
+ if (data_len < SILC_HTTP_SERVER_BUFLEN)
+ return TRUE;
+ return FALSE;
+ }
+ silc_buffer_set(&postdata, tmp, data_len);
+ SILC_LOG_HEXDUMP(("HTTP POST data"), tmp, data_len);
+
+ /* Send request to caller */
+ httpd->callback(httpd, conn, uri, method, &postdata, httpd->context);
+
+ } else {
+ /* XXX Send bad request error */
+ }
+
+ return TRUE;
+}
+
+/* Send HTTP data to connection */
+
+static SilcBool silc_http_server_send_internal(SilcHttpServer httpd,
+ SilcHttpConnection conn,
+ SilcBuffer data,
+ SilcBool headers)
+{
+ int ret;
+
+ SILC_LOG_HEXDUMP(("HTTP data"), silc_buffer_data(data),
+ silc_buffer_len(data));
+
+ /* Write the packet to the stream */
+ while (silc_buffer_len(data) > 0) {
+ ret = silc_stream_write(conn->stream, silc_buffer_data(data),
+ silc_buffer_len(data));
+ if (ret == 0 || ret == - 2)
+ return FALSE;
+
+ if (ret == -1) {
+ /* Cannot write now, write later. */
+ if (silc_buffer_len(data) - ret >= silc_buffer_taillen(conn->outbuf))
+ if (!silc_buffer_realloc(conn->outbuf,
+ silc_buffer_truelen(conn->outbuf) +
+ silc_buffer_len(data) - ret)) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return FALSE;
+ }
+ silc_buffer_pull_tail(conn->outbuf, silc_buffer_len(data) - ret);
+ silc_buffer_put(conn->outbuf, silc_buffer_data(data) + ret,
+ silc_buffer_len(data) - ret);
+ return TRUE;
+ }
+
+ /* Wrote data */
+ silc_buffer_pull(data, ret);
+ }
+
+ if (!headers) {
+ /* Data sent, close connection */
+ SILC_LOG_DEBUG(("Data sent"));
+ silc_http_server_close_connection(conn);
+ }
+
+ return TRUE;
+}
+
+/* Allocate connection context */
+
+static SilcHttpConnection silc_http_server_alloc_connection(void)
+{
+ SilcHttpConnection conn;
+
+ conn = silc_calloc(1, sizeof(*conn));
+ if (!conn)
+ return NULL;
+
+ conn->inbuf = silc_buffer_alloc(SILC_HTTP_SERVER_BUFLEN);
+ if (!conn->inbuf) {
+ silc_free(conn);
+ return NULL;
+ }
+
+ conn->outbuf = silc_buffer_alloc(SILC_HTTP_SERVER_BUFLEN);
+ if (!conn->outbuf) {
+ silc_buffer_free(conn->inbuf);
+ silc_free(conn);
+ return NULL;
+ }
+
+ silc_buffer_reset(conn->inbuf);
+ silc_buffer_reset(conn->outbuf);
+
+ return conn;
+}
+
+/* Check if connection has timedout */
+
+SILC_TASK_CALLBACK(silc_http_server_connection_timeout)
+{
+ SilcHttpConnection conn = context;
+ SilcInt64 curtime = silc_time();
+
+ if (curtime - conn->touched > SILC_HTTP_SERVER_TIMEOUT) {
+ SILC_LOG_DEBUG(("Connection timeout"));
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return;
+ }
+
+ silc_schedule_task_add_timeout(conn->httpd->schedule,
+ silc_http_server_connection_timeout, conn,
+ SILC_HTTP_SERVER_TIMEOUT, 0);
+}
+
+/* Data I/O callback */
+
+static void silc_http_server_io(SilcStream stream, SilcStreamStatus status,
+ void *context)
+{
+ SilcHttpConnection conn = context;
+ SilcHttpServer httpd = conn->httpd;
+ int ret;
+
+ switch (status) {
+ case SILC_STREAM_CAN_READ:
+ SILC_LOG_DEBUG(("Read HTTP data"));
+
+ conn->touched = silc_time();
+
+ /* Make sure we have fair amount of free space in inbuf */
+ if (silc_buffer_taillen(conn->inbuf) < SILC_HTTP_SERVER_BUFLEN)
+ if (!silc_buffer_realloc(conn->inbuf, silc_buffer_truelen(conn->inbuf) +
+ SILC_HTTP_SERVER_BUFLEN * 2)) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return;
+ }
+
+ /* Read data from stream */
+ ret = silc_stream_read(conn->stream, conn->inbuf->tail,
+ silc_buffer_taillen(conn->inbuf));
+
+ if (ret == 0 || ret == -2) {
+ silc_http_server_close_connection(conn);
+ return;
+ }
+
+ if (ret == -1) {
+ /* Cannot read now, do it later. */
+ silc_buffer_pull(conn->inbuf, silc_buffer_len(conn->inbuf));
+ return;
+ }
+
+ SILC_LOG_DEBUG(("Read %d bytes data", ret));
+
+ /* Parse the data */
+ silc_buffer_pull_tail(conn->inbuf, ret);
+ if (!silc_http_server_parse(httpd, conn))
+ silc_buffer_reset(conn->outbuf);
+
+ break;
+
+ case SILC_STREAM_CAN_WRITE:
+ SILC_LOG_DEBUG(("Write HTTP data"));
+
+ conn->touched = silc_time();
+
+ /* Write pending data to stream */
+ while (silc_buffer_len(conn->outbuf) > 0) {
+ ret = silc_stream_write(conn->stream, silc_buffer_data(conn->outbuf),
+ silc_buffer_len(conn->outbuf));
+
+ if (ret == 0 || ret == -2) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return;
+ }
+
+ if (ret == -1)
+ /* Cannot write now, write later. */
+ return;
+
+ /* Wrote data */
+ silc_buffer_pull(conn->outbuf, ret);
+ }
+
+ /* Data sent, close connection */
+ SILC_LOG_DEBUG(("Data sent"));
+ silc_http_server_close_connection(conn);
+ break;
+
+ default:
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ break;
+ }
+}
+
+/* Accepts new connection */
+
+static void silc_http_server_new_connection(SilcNetStatus status,
+ SilcStream stream,
+ void *context)
+{
+ SilcHttpServer httpd = context;
+ SilcHttpConnection conn;
+ const char *hostname = NULL, *ip = NULL;
+
+ /* Get free connection */
+ silc_list_start(httpd->conns);
+ conn = silc_list_get(httpd->conns);
+ if (!conn) {
+ conn = silc_http_server_alloc_connection();
+ if (!conn) {
+ silc_stream_destroy(stream);
+ return;
+ }
+ }
+
+ conn->httpd = httpd;
+ conn->stream = stream;
+
+ silc_socket_stream_get_info(stream, NULL, &hostname, &ip, NULL);
+ SILC_LOG_INFO(("HTTPD: New connection %s (%s)", hostname, ip));
+
+ /* Schedule the connection for data I/O */
+ silc_stream_set_notifier(stream, httpd->schedule, silc_http_server_io, conn);
+
+ /* Add connection timeout check */
+ silc_schedule_task_add_timeout(httpd->schedule,
+ silc_http_server_connection_timeout, conn,
+ SILC_HTTP_SERVER_TIMEOUT, 0);
+}
+
+
+/******************************* Public API *********************************/
+
+/* Allocate HTTP server */
+
+SilcHttpServer silc_http_server_alloc(const char *ip, SilcUInt16 port,
+ SilcUInt32 max_connections,
+ SilcSchedule schedule,
+ SilcHttpServerCallback callback,
+ void *context)
+{
+ SilcHttpServer httpd;
+ SilcHttpConnection conn;
+ int i;
+
+ SILC_LOG_DEBUG(("Start HTTP server at %s:%d", ip, port));
+
+ if (!ip || !schedule || !callback)
+ return FALSE;
+
+ httpd = silc_calloc(1, sizeof(*httpd));
+ if (!httpd)
+ return NULL;
+
+ /* Create server listener */
+ httpd->listener =
+ silc_net_tcp_create_listener(&ip, 1, port, TRUE, FALSE, schedule,
+ silc_http_server_new_connection, httpd);
+ if (!httpd->listener) {
+ SILC_LOG_ERROR(("Could not bind HTTP server at %s:%d", ip, port));
+ silc_http_server_free(httpd);
+ return NULL;
+ }
+
+ httpd->schedule = schedule;
+ httpd->callback = callback;
+ httpd->context = context;
+
+ /* Allocate connections list */
+ if (!max_connections)
+ max_connections = SILC_HTTP_SERVER_CONNS;
+ for (i = 0; i < max_connections; i++) {
+ conn = silc_http_server_alloc_connection();
+ if (!conn)
+ break;
+ silc_list_add(httpd->conns, conn);
+ silc_list_add(httpd->allconns, conn);
+ }
+
+ SILC_LOG_DEBUG(("HTTP Server started"));
+
+ return httpd;
+}
+
+/* Free HTTP server */
+
+void silc_http_server_free(SilcHttpServer httpd)
+{
+ SilcHttpConnection conn;
+
+ silc_list_start(httpd->allconns);
+ while ((conn = silc_list_get(httpd->allconns))) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ silc_buffer_free(conn->inbuf);
+ silc_buffer_free(conn->outbuf);
+ silc_free(conn);
+ }
+
+ if (httpd->listener)
+ silc_net_close_listener(httpd->listener);
+
+ silc_free(httpd);
+}
+
+/* Send HTTP data to connection */
+
+SilcBool silc_http_server_send(SilcHttpServer httpd,
+ SilcHttpConnection conn,
+ SilcBuffer data)
+{
+ SilcBufferStruct h;
+ unsigned char *headers, tmp[16];
+ SilcUInt32 headers_len;
+ SilcBool ret;
+
+ SILC_LOG_DEBUG(("Sending HTTP data"));
+
+ conn->touched = silc_time();
+
+ /* Write headers */
+ silc_buffer_set(&h, SILC_HTTP_SERVER_HEADER,
+ strlen(SILC_HTTP_SERVER_HEADER));
+ ret = silc_http_server_send_internal(httpd, conn, &h, TRUE);
+ if (!ret) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return FALSE;
+ }
+
+ if (!conn->headers) {
+ conn->headers = silc_mime_alloc();
+ if (!conn->headers) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return FALSE;
+ }
+ }
+
+ snprintf(tmp, sizeof(tmp), "%d", (int)silc_buffer_len(data));
+ silc_mime_add_field(conn->headers, "Content-Length", tmp);
+ silc_mime_add_field(conn->headers, "Connection", "keep-alive");
+ snprintf(tmp, sizeof(tmp), "%d", (int)SILC_HTTP_SERVER_TIMEOUT);
+ silc_mime_add_field(conn->headers, "Keep-alive", tmp);
+ silc_mime_add_field(conn->headers, "Last-Modified",
+ silc_time_string(conn->touched));
+
+ headers = silc_mime_encode(conn->headers, &headers_len);
+ if (headers) {
+ silc_buffer_set(&h, headers, headers_len);
+ if (!silc_http_server_send_internal(httpd, conn, &h, TRUE)) {
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+ return FALSE;
+ }
+ silc_free(headers);
+ }
+
+ /* Write the page data */
+ return silc_http_server_send_internal(httpd, conn, data, FALSE);
+}
+
+/* Send error reply */
+
+SilcBool silc_http_server_send_error(SilcHttpServer httpd,
+ SilcHttpConnection conn,
+ const char *error,
+ const char *error_message)
+{
+ SilcBool ret;
+ SilcBufferStruct data;
+
+ memset(&data, 0, sizeof(data));
+ silc_buffer_strformat(&data,
+ "HTTP/1.1 ", error, "\r\n\r\n", error_message,
+ SILC_STRFMT_END);
+
+ /* Send the message */
+ ret = silc_http_server_send_internal(httpd, conn, &data, FALSE);
+
+ silc_buffer_purge(&data);
+
+ /* Close connection */
+ conn->keepalive = FALSE;
+ silc_http_server_close_connection(conn);
+
+ return ret;
+}
+
+/* Get field */
+
+const char *silc_http_server_get_header(SilcHttpServer httpd,
+ SilcHttpConnection conn,
+ const char *field)
+{
+ if (!conn->curheaders)
+ return NULL;
+ return silc_mime_get_field(conn->curheaders, field);
+}
+
+/* Add field */
+
+SilcBool silc_http_server_add_header(SilcHttpServer httpd,
+ SilcHttpConnection conn,
+ const char *field,
+ const char *value)
+{
+ SILC_LOG_DEBUG(("Adding header %s:%s", field, value));
+
+ if (!conn->headers) {
+ conn->headers = silc_mime_alloc();
+ if (!conn->headers) {
+ silc_http_server_close_connection(conn);
+ return FALSE;
+ }
+ }
+
+ silc_mime_add_field(conn->headers, field, value);
+ return TRUE;
+}
projects / silc.git / blobdiff