--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/project_files/frontlib/net/netbase.c Sun Oct 28 15:12:37 2012 +0100
@@ -0,0 +1,259 @@
+/*
+ * Hedgewars, a free turn based strategy game
+ * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>
+ *
+ * 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; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "netbase.h"
+#include "../util/buffer.h"
+#include "../util/logging.h"
+#include "../util/util.h"
+#include "../socket.h"
+
+#include <string.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#define NET_READBUFFER_LIMIT (1024*1024)
+
+struct _flib_netbase {
+ flib_vector *readBuffer;
+ flib_tcpsocket *sock;
+};
+
+flib_netbase *flib_netbase_create(const char *server, uint16_t port) {
+ if(log_badargs_if2(server==NULL, port==0)) {
+ return NULL;
+ }
+
+ flib_netbase *result = NULL;
+ flib_netbase *newNet = flib_calloc(1, sizeof(flib_netbase));
+
+ if(newNet) {
+ newNet->readBuffer = flib_vector_create();
+ newNet->sock = flib_socket_connect(server, port);
+ if(newNet->readBuffer && newNet->sock) {
+ flib_log_i("Connected to server %s:%u", server, (unsigned)port);
+ result = newNet;
+ newNet = NULL;
+ }
+ }
+ flib_netbase_destroy(newNet);
+
+ return result;
+}
+
+void flib_netbase_destroy(flib_netbase *net) {
+ if(net) {
+ flib_socket_close(net->sock);
+ flib_vector_destroy(net->readBuffer);
+ free(net);
+ }
+}
+
+bool flib_netbase_connected(flib_netbase *net) {
+ if(!log_badargs_if(net==NULL) && net->sock) {
+ return true;
+ }
+ return false;
+}
+
+/**
+ * Parses and returns a message, and removes it from the vector.
+ */
+static flib_netmsg *parseMessage(flib_vector *vec) {
+ const uint8_t *partStart = flib_vector_data(vec);
+ const uint8_t *end = partStart+flib_vector_size(vec);
+ flib_netmsg *result = flib_netmsg_create();
+ if(!result) {
+ return NULL;
+ }
+
+ while(1) {
+ const uint8_t *partEnd = memchr(partStart, '\n', end-partStart);
+ if(!partEnd) {
+ // message incomplete
+ flib_netmsg_destroy(result);
+ return NULL;
+ } else if(partEnd-partStart == 0) {
+ // Zero-length part, message end marker. Remove the message from the vector.
+ uint8_t *vectorStart = flib_vector_data(vec);
+ size_t msgLen = partEnd+1-vectorStart;
+ memmove(vectorStart, partEnd+1, flib_vector_size(vec)-msgLen);
+ flib_vector_resize(vec, flib_vector_size(vec)-msgLen);
+ return result;
+ } else {
+ if(flib_netmsg_append_part(result, partStart, partEnd-partStart)) {
+ flib_netmsg_destroy(result);
+ return NULL;
+ }
+ partStart = partEnd+1; // Skip the '\n'
+ }
+ }
+ return NULL; // Never reached
+}
+
+/**
+ * Receive some bytes and add them to the buffer.
+ * Returns the number of bytes received.
+ * Automatically closes the socket if an error occurs
+ * and sets sock=NULL.
+ */
+static int receiveToBuffer(flib_netbase *net) {
+ uint8_t buffer[256];
+ if(!net->sock) {
+ return 0;
+ } else if(flib_vector_size(net->readBuffer) > NET_READBUFFER_LIMIT) {
+ flib_log_e("Net connection closed: Net message too big");
+ flib_socket_close(net->sock);
+ net->sock = NULL;
+ return 0;
+ } else {
+ int size = flib_socket_nbrecv(net->sock, buffer, sizeof(buffer));
+ if(size>=0 && !flib_vector_append(net->readBuffer, buffer, size)) {
+ return size;
+ } else {
+ flib_socket_close(net->sock);
+ net->sock = NULL;
+ return 0;
+ }
+ }
+}
+
+flib_netmsg *flib_netbase_recv_message(flib_netbase *net) {
+ if(log_badargs_if(net==NULL)) {
+ return NULL;
+ }
+
+ flib_netmsg *msg;
+ while(!(msg=parseMessage(net->readBuffer))
+ && receiveToBuffer(net)) {}
+
+ if(msg) {
+ return msg;
+ } else if(!net->sock && flib_vector_size(net->readBuffer)>0) {
+ // Connection is down and we didn't get a complete message, just flush the rest.
+ flib_vector_resize(net->readBuffer, 0);
+ }
+ return NULL;
+}
+
+static void logSentMsg(const uint8_t *data, size_t len) {
+ if(flib_log_isActive(FLIB_LOGLEVEL_DEBUG)) {
+ flib_log_d("[NET OUT][%03u]%*.*s",(unsigned)len, (unsigned)len, (unsigned)len, data);
+ }
+}
+
+int flib_netbase_send_raw(flib_netbase *net, const void *data, size_t len) {
+ if(log_badargs_if2(net==NULL, data==NULL && len>0)) {
+ return -1;
+ }
+ if(!net->sock) {
+ flib_log_w("flib_netbase_send_raw: Not connected.");
+ return -1;
+ }
+
+ if(flib_socket_send(net->sock, data, len) == len) {
+ logSentMsg(data, len);
+ return 0;
+ } else {
+ flib_log_w("Failed or incomplete write: net connection lost.");
+ flib_socket_close(net->sock);
+ net->sock = NULL;
+ return -1;
+ }
+}
+
+int flib_netbase_send_message(flib_netbase *net, const flib_netmsg *msg) {
+ if(log_badargs_if2(net==NULL, msg==NULL)) {
+ return -1;
+ }
+
+ size_t totalSize = 0;
+ for(int i=0; i<msg->partCount; i++) {
+ totalSize += strlen(msg->parts[i]) + 1;
+ }
+ totalSize++; // Last part ends in two '\n' instead of one
+
+ uint8_t *buffer = flib_malloc(totalSize);
+ if(!buffer) {
+ return -1;
+ }
+ size_t pos = 0;
+ for(int i=0; i<msg->partCount; i++) {
+ size_t partsize = strlen(msg->parts[i]);
+ memcpy(buffer+pos, msg->parts[i], partsize);
+ pos += partsize;
+ buffer[pos++] = '\n';
+ }
+ buffer[pos++] = '\n';
+ return flib_netbase_send_raw(net, buffer, pos);
+}
+
+int flib_netbase_sendf(flib_netbase *net, const char *format, ...) {
+ int result = -1;
+ if(!log_badargs_if2(net==NULL, format==NULL)) {
+ va_list argp;
+ va_start(argp, format);
+ char *buffer = flib_vasprintf(format, argp);
+ if(buffer) {
+ result = flib_netbase_send_raw(net, buffer, strlen(buffer));
+ }
+ free(buffer);
+ va_end(argp);
+ }
+ return result;
+}
+
+flib_netmsg *flib_netmsg_create() {
+ flib_netmsg *result = flib_calloc(1, sizeof(flib_netmsg));
+ if(result) {
+ result->partCount = 0;
+ result->parts = NULL;
+ return result;
+ } else {
+ return NULL;
+ }
+}
+
+void flib_netmsg_destroy(flib_netmsg *msg) {
+ if(msg) {
+ for(int i=0; i<msg->partCount; i++) {
+ free(msg->parts[i]);
+ }
+ free(msg->parts);
+ free(msg);
+ }
+}
+
+int flib_netmsg_append_part(flib_netmsg *msg, const void *part, size_t partlen) {
+ int result = -1;
+ if(!log_badargs_if2(msg==NULL, part==NULL && partlen>0)) {
+ char **newParts = realloc(msg->parts, (msg->partCount+1)*sizeof(*msg->parts));
+ if(newParts) {
+ msg->parts = newParts;
+ msg->parts[msg->partCount] = flib_malloc(partlen+1);
+ if(msg->parts[msg->partCount]) {
+ memcpy(msg->parts[msg->partCount], part, partlen);
+ msg->parts[msg->partCount][partlen] = 0;
+ msg->partCount++;
+ result = 0;
+ }
+ }
+ }
+ return result;
+}