mirror of
https://github.com/VCMP-SqMod/SqMod.git
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327 lines
8.3 KiB
C++
327 lines
8.3 KiB
C++
/* response.inl
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*
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* Bufferring for HTTP headers for HTTP response.
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* This function are only intended to be used at the server side.
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* Optional for HTTP/1.0 and HTTP/1.1, mandatory for HTTP/2.
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*
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* This file is part of the CivetWeb project.
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*/
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#if defined(NO_RESPONSE_BUFFERING) && defined(USE_HTTP2)
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#error "HTTP2 works only if NO_RESPONSE_BUFFERING is not set"
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#endif
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/* Internal function to free header list */
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static void
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free_buffered_response_header_list(struct mg_connection *conn)
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{
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#if !defined(NO_RESPONSE_BUFFERING)
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while (conn->response_info.num_headers > 0) {
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conn->response_info.num_headers--;
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mg_free((void *)conn->response_info
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.http_headers[conn->response_info.num_headers]
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.name);
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conn->response_info.http_headers[conn->response_info.num_headers].name =
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0;
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mg_free((void *)conn->response_info
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.http_headers[conn->response_info.num_headers]
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.value);
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conn->response_info.http_headers[conn->response_info.num_headers]
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.value = 0;
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}
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#else
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(void)conn; /* Nothing to do */
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#endif
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}
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/* Send first line of HTTP/1.x response */
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static void
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send_http1_response_status_line(struct mg_connection *conn)
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{
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const char *status_txt;
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const char *http_version = conn->request_info.http_version;
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int status_code = conn->status_code;
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if ((status_code < 100) || (status_code > 999)) {
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/* Set invalid status code to "500 Internal Server Error" */
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status_code = 500;
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}
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if (!http_version) {
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http_version = "1.0";
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}
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/* mg_get_response_code_text will never return NULL */
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status_txt = mg_get_response_code_text(conn, conn->status_code);
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mg_printf(conn, "HTTP/%s %i %s\r\n", http_version, status_code, status_txt);
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}
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/* Initialize a new HTTP response
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* Parameters:
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* conn: Current connection handle.
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* status: HTTP status code (e.g., 200 for "OK").
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* Return:
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* 0: ok
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* -1: parameter error
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* -2: invalid connection type
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* -3: invalid connection status
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*/
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int
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mg_response_header_start(struct mg_connection *conn, int status)
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{
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if ((conn == NULL) || (status < 100) || (status > 999)) {
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/* Parameter error */
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return -1;
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}
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if ((conn->connection_type != CONNECTION_TYPE_REQUEST)
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|| (conn->protocol_type == PROTOCOL_TYPE_WEBSOCKET)) {
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/* Only allowed in server context */
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return -2;
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}
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if (conn->request_state != 0) {
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/* only allowed if nothing was sent up to now */
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return -3;
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}
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conn->status_code = status;
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conn->request_state = 1;
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/* Buffered response is stored, unbuffered response will be sent directly,
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* but we can only send HTTP/1.x response here */
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#if !defined(NO_RESPONSE_BUFFERING)
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free_buffered_response_header_list(conn);
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#else
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send_http1_response_status_line(conn);
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conn->request_state = 1; /* Reset from 10 to 1 */
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#endif
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return 0;
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}
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/* Add a new HTTP response header line
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* Parameters:
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* conn: Current connection handle.
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* header: Header name.
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* value: Header value.
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* value_len: Length of header value, excluding the terminating zero.
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* Use -1 for "strlen(value)".
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* Return:
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* 0: ok
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* -1: parameter error
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* -2: invalid connection type
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* -3: invalid connection status
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* -4: too many headers
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* -5: out of memory
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*/
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int
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mg_response_header_add(struct mg_connection *conn,
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const char *header,
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const char *value,
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int value_len)
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{
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#if !defined(NO_RESPONSE_BUFFERING)
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int hidx;
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#endif
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if ((conn == NULL) || (header == NULL) || (value == NULL)) {
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/* Parameter error */
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return -1;
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}
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if ((conn->connection_type != CONNECTION_TYPE_REQUEST)
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|| (conn->protocol_type == PROTOCOL_TYPE_WEBSOCKET)) {
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/* Only allowed in server context */
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return -2;
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}
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if (conn->request_state != 1) {
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/* only allowed if mg_response_header_start has been called before */
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return -3;
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}
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#if !defined(NO_RESPONSE_BUFFERING)
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hidx = conn->response_info.num_headers;
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if (hidx >= MG_MAX_HEADERS) {
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/* Too many headers */
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return -4;
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}
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/* Alloc new element */
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conn->response_info.http_headers[hidx].name =
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mg_strdup_ctx(header, conn->phys_ctx);
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if (value_len >= 0) {
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char *hbuf =
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(char *)mg_malloc_ctx((unsigned)value_len + 1, conn->phys_ctx);
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if (hbuf) {
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memcpy(hbuf, value, (unsigned)value_len);
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hbuf[value_len] = 0;
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}
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conn->response_info.http_headers[hidx].value = hbuf;
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} else {
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conn->response_info.http_headers[hidx].value =
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mg_strdup_ctx(value, conn->phys_ctx);
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}
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if ((conn->response_info.http_headers[hidx].name == 0)
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|| (conn->response_info.http_headers[hidx].value == 0)) {
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/* Out of memory */
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mg_free((void *)conn->response_info.http_headers[hidx].name);
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conn->response_info.http_headers[hidx].name = 0;
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mg_free((void *)conn->response_info.http_headers[hidx].value);
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conn->response_info.http_headers[hidx].value = 0;
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return -5;
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}
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/* OK, header stored */
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conn->response_info.num_headers++;
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#else
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if (value_len >= 0) {
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mg_printf(conn, "%s: %.*s\r\n", header, (int)value_len, value);
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} else {
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mg_printf(conn, "%s: %s\r\n", header, value);
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}
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conn->request_state = 1; /* Reset from 10 to 1 */
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#endif
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return 0;
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}
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/* forward */
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static int parse_http_headers(char **buf, struct mg_header hdr[MG_MAX_HEADERS]);
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/* Add a complete header string (key + value).
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* Parameters:
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* conn: Current connection handle.
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* http1_headers: Header line(s) in the form "name: value".
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* Return:
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* >=0: no error, number of header lines added
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* -1: parameter error
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* -2: invalid connection type
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* -3: invalid connection status
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* -4: too many headers
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* -5: out of memory
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*/
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int
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mg_response_header_add_lines(struct mg_connection *conn,
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const char *http1_headers)
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{
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struct mg_header add_hdr[MG_MAX_HEADERS];
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int num_hdr, i, ret;
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char *workbuffer, *parse;
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/* We need to work on a copy of the work buffer, sice parse_http_headers
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* will modify */
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workbuffer = mg_strdup_ctx(http1_headers, conn->phys_ctx);
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if (!workbuffer) {
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/* Out of memory */
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return -5;
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}
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/* Call existing method to split header buffer */
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parse = workbuffer;
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num_hdr = parse_http_headers(&parse, add_hdr);
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ret = num_hdr;
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for (i = 0; i < num_hdr; i++) {
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int lret =
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mg_response_header_add(conn, add_hdr[i].name, add_hdr[i].value, -1);
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if ((ret > 0) && (lret < 0)) {
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/* Store error return value */
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ret = lret;
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}
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}
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/* mg_response_header_add created a copy, so we can free the original */
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mg_free(workbuffer);
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return ret;
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}
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#if defined(USE_HTTP2)
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static int http2_send_response_headers(struct mg_connection *conn);
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#endif
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/* Send http response
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* Parameters:
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* conn: Current connection handle.
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* Return:
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* 0: ok
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* -1: parameter error
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* -2: invalid connection type
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* -3: invalid connection status
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*/
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int
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mg_response_header_send(struct mg_connection *conn)
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{
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#if !defined(NO_RESPONSE_BUFFERING)
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int i;
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int has_date = 0;
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int has_connection = 0;
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#endif
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if (conn == NULL) {
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/* Parameter error */
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return -1;
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}
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if ((conn->connection_type != CONNECTION_TYPE_REQUEST)
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|| (conn->protocol_type == PROTOCOL_TYPE_WEBSOCKET)) {
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/* Only allowed in server context */
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return -2;
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}
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if (conn->request_state != 1) {
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/* only allowed if mg_response_header_start has been called before */
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return -3;
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}
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/* State: 2 */
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conn->request_state = 2;
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#if !defined(NO_RESPONSE_BUFFERING)
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#if defined(USE_HTTP2)
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if (conn->protocol_type == PROTOCOL_TYPE_HTTP2) {
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int ret = http2_send_response_headers(conn);
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return ret ? 0 : 0; /* todo */
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}
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#endif
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/* Send */
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send_http1_response_status_line(conn);
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for (i = 0; i < conn->response_info.num_headers; i++) {
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mg_printf(conn,
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"%s: %s\r\n",
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conn->response_info.http_headers[i].name,
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conn->response_info.http_headers[i].value);
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/* Check for some special headers */
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if (!mg_strcasecmp("Date", conn->response_info.http_headers[i].name)) {
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has_date = 1;
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}
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if (!mg_strcasecmp("Connection",
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conn->response_info.http_headers[i].name)) {
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has_connection = 1;
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}
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}
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if (!has_date) {
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time_t curtime = time(NULL);
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char date[64];
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gmt_time_string(date, sizeof(date), &curtime);
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mg_printf(conn, "Date: %s\r\n", date);
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}
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if (!has_connection) {
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mg_printf(conn, "Connection: %s\r\n", suggest_connection_header(conn));
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}
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#endif
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mg_write(conn, "\r\n", 2);
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conn->request_state = 3;
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/* ok */
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return 0;
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}
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