/* Detect chunked upload progress
*/
static int all_chunks_uploaded(char *buffer, int size, long *chunk_size_pos) {
int chunk_size, len;
char *end;
if (*chunk_size_pos >= size) {
return -1;
}
if ((end = strstr(buffer + *chunk_size_pos, "\r\n")) == NULL) {
return 0;
}
*end = '\0';
chunk_size = hex_to_int(buffer + *chunk_size_pos);
*end = '\r';
if (chunk_size == -1) {
return -1;
}
len = (end - buffer) + chunk_size + 4;
if (chunk_size == 0) {
if (size >= len) {
return 1;
}
} else if (size > len) {
*chunk_size_pos = len;
return all_chunks_uploaded(buffer, size, chunk_size_pos);
}
return 0;
}
/* Read the request from a client socket.
*/
int fetch_request(t_session *session) {
char *new_reqbuf, *strstart, *strend;
long max_request_size, bytes_read, header_length = -1, content_length = -1, chunk_size_pos;
int result = 200, write_bytes, poll_result, upload_handle = -1, retval;
time_t deadline;
struct pollfd poll_data;
bool keep_reading = true, store_on_disk = false, chunked_request = false;
if (session->request_limit == false) {
deadline = session->time + NO_REQUEST_LIMIT_TIME;
max_request_size = NO_REQUEST_LIMIT_SIZE;
} else if (session->kept_alive == 0) {
deadline = session->time + session->binding->time_for_1st_request;
max_request_size = session->binding->max_request_size;
} else {
deadline = session->time + session->binding->time_for_request;
max_request_size = session->binding->max_request_size;
}
do {
/* Check if requestbuffer contains a complete request.
*/
if (session->request != NULL) {
if (header_length == -1) {
if ((strstart = strstr(session->request, "\r\n\r\n")) != NULL) {
*(strstart + 2) = '\0';
header_length = strstart + 4 - session->request;
session->header_length = header_length;
determine_request_method(session);
store_on_disk = (session->request_method == PUT) && session->binding->enable_alter;
if (store_on_disk) {
if ((session->uploaded_file = (char*)malloc(session->config->upload_directory_len + 15)) != NULL) {
strcpy(session->uploaded_file, session->config->upload_directory);
strcpy(session->uploaded_file + session->config->upload_directory_len, "/upload_XXXXXX");
umask(S_IWGRP | S_IWOTH);
if ((upload_handle = mkstemp(session->uploaded_file)) == -1) {
free(session->uploaded_file);
session->uploaded_file = NULL;
}
}
if (session->uploaded_file == NULL) {
log_error(session, "can't create temporary file for PUT request");
result = 500;
break;
}
session->uploaded_size = session->bytes_in_buffer - header_length;
if (write_buffer(upload_handle, session->request + header_length, session->uploaded_size) == -1) {
result = 500;
break;
}
session->bytes_in_buffer = header_length;
}
}
}
if (header_length != -1) {
if ((content_length == -1) && (chunked_request == false)) {
if ((strstart = strcasestr(session->request, hs_conlen)) != NULL) {
/* Request has Content-Length
*/
strstart += 16;
if ((strend = strstr(strstart, "\r\n")) != NULL) {
*strend = '\0';
content_length = str_to_int(strstart);
*strend = '\r';
if ((content_length < 0) || (INT_MAX - content_length - 2 <= header_length)) {
result = 500;
break;
}
if (store_on_disk) {
/* Write to file on disk
*/
session->content_length = 0;
if (content_length > session->binding->max_upload_size) {
result = 413;
break;
}
session->buffer_size = header_length + REQUEST_BUFFER_CHUNK;
if ((new_reqbuf = (char*)realloc(session->request, session->buffer_size + 1)) != NULL) {
session->request = new_reqbuf;
} else {
session->error_cause = ec_SOCKET_READ_ERROR;
result = -1;
break;
}
} else {
/* Read into memory
*/
session->content_length = content_length;
if (header_length + content_length > max_request_size) {
session->error_cause = ec_MAX_REQUESTSIZE;
result = -1;
break;
}
if (header_length + content_length > session->buffer_size) {
session->buffer_size = header_length + content_length;
if ((new_reqbuf = (char*)realloc(session->request, session->buffer_size + 1)) != NULL) {
session->request = new_reqbuf;
} else {
session->error_cause = ec_SOCKET_READ_ERROR;
result = -1;
break;
}
}
}
}
} else if (strcasestr(session->request, hs_chunked) != NULL) {
/* Chunked transfer encoding
*/
if (store_on_disk) {
log_error(session, "Chunked transfer encoding for PUT requests not supported.");
result = -1;
break;
}
chunked_request = true;
chunk_size_pos = 0;
} else {
/* No content
*/
session->content_length = 0;
if (store_on_disk) {
result = 411;
}
break;
}
}
if (content_length > -1) {
if (store_on_disk) {
if (session->uploaded_size == content_length) {
/* Received a complete PUT request */
break;
}
} else {
if (session->bytes_in_buffer >= header_length + content_length) {
/* Received a complete request */
break;
}
}
} else if (chunked_request) {
/* All chunks uploaded
*/
retval = all_chunks_uploaded(session->request + session->header_length,
session->bytes_in_buffer - session->header_length,
&chunk_size_pos);
if (retval == -1) {
result = 400;
break;
} else if (retval == 1) {
if ((session->content_length = merge_chunks(session->request + session->header_length,
session->bytes_in_buffer - session->header_length,
&(session->bytes_in_buffer))) == -1) {
result = -1;
}
break;
}
}
}
}
#ifdef ENABLE_SSL
poll_result = session->binding->use_ssl ? ssl_pending(&(session->ssl_context)) : 0;
if (poll_result == 0) {
#endif
poll_data.fd = session->client_socket;
poll_data.events = POLL_EVENT_BITS;
poll_result = poll(&poll_data, 1, 1000);
#ifdef ENABLE_SSL
}
#endif
switch (poll_result) {
case -1:
if (errno != EINTR) {
if (session->bytes_in_buffer == 0) {
session->error_cause = ec_CLIENT_DISCONNECTED;
} else {
session->error_cause = ec_SOCKET_READ_ERROR;
}
result = -1;
keep_reading = false;
}
break;
case 0:
if (session->force_quit) {
session->error_cause = ec_FORCE_QUIT;
result = -1;
keep_reading = false;
} else if (time(NULL) > deadline) {
session->error_cause = ec_TIMEOUT;
result = -1;
keep_reading = false;
}
break;
default:
if ((content_length == -1) && ((session->buffer_size - session->bytes_in_buffer) < 256)) {
session->buffer_size += REQUEST_BUFFER_CHUNK;
if ((new_reqbuf = (char*)realloc(session->request, session->buffer_size + 1)) != NULL) {
session->request = new_reqbuf;
} else {
session->error_cause = ec_SOCKET_READ_ERROR;
result = -1;
keep_reading = false;
break;
}
}
/* Read from socket.
*/
#ifdef ENABLE_SSL
if (session->binding->use_ssl) {
bytes_read = ssl_receive(&(session->ssl_context), session->request + session->bytes_in_buffer,
session->buffer_size - session->bytes_in_buffer);
} else
#endif
bytes_read = recv(session->client_socket, session->request + session->bytes_in_buffer,
session->buffer_size - session->bytes_in_buffer, 0);
switch (bytes_read) {
case -1:
if (errno != EINTR) {
if (session->bytes_in_buffer == 0) {
session->error_cause = ec_CLIENT_DISCONNECTED;
} else {
session->error_cause = ec_SOCKET_READ_ERROR;
}
result = -1;
keep_reading = false;
}
break;
case 0:
session->error_cause = ec_CLIENT_DISCONNECTED;
result = -1;
keep_reading = false;
break;
default:
if (store_on_disk) {
/* Write to file on disk
*/
write_bytes = bytes_read;
if (session->uploaded_size + bytes_read > content_length) {
write_bytes -= ((session->uploaded_size + bytes_read) - content_length);
}
if (write_buffer(upload_handle, session->request + header_length, write_bytes) == -1) {
result = 500;
keep_reading = false;
break;
}
if ((session->uploaded_size += write_bytes) > session->binding->max_upload_size) {
keep_reading = false;
result = 413;
break;
}
if (write_bytes < bytes_read) {
memmove(session->request + header_length, session->request + header_length + write_bytes, bytes_read - write_bytes);
session->bytes_in_buffer += bytes_read - write_bytes;
keep_reading = false;
}
} else {
/* Read into memory
*/
session->bytes_in_buffer += bytes_read;
*(session->request + session->bytes_in_buffer) = '\0';
if (session->bytes_in_buffer > max_request_size) {
keep_reading = false;
session->error_cause = ec_MAX_REQUESTSIZE;
result = -1;
break;
}
}
}
}
} while (keep_reading);
if (upload_handle != -1) {
fsync(upload_handle);
close(upload_handle);
}
#ifdef ENABLE_TOMAHAWK
increment_transfer(TRANSFER_RECEIVED, header_length + content_length);
#endif
return result;
}
