3 /* buf trp (transport) - buffered transport using the TCP one */
5 /* Authors: Martin Quinson */
6 /* Copyright (C) 2004 Martin Quinson. */
8 /* This program is free software; you can redistribute it and/or modify it
9 under the terms of the license (GNU LGPL) which comes with this package. */
11 #include <netinet/in.h> /* htonl/ntohl */
13 #include <string.h> /* memset */
15 #include "gras_private.h"
16 #include "transport_private.h"
18 GRAS_LOG_NEW_DEFAULT_SUBCATEGORY(trp_buf,transport);
23 gras_error_t gras_trp_buf_socket_client(gras_trp_plugin_t *self,
26 /* OUT */ gras_socket_t *sock);
27 gras_error_t gras_trp_buf_socket_server(gras_trp_plugin_t *self,
29 /* OUT */ gras_socket_t *sock);
30 gras_error_t gras_trp_buf_socket_accept(gras_socket_t *sock,
33 void gras_trp_buf_socket_close(gras_socket_t *sd);
35 gras_error_t gras_trp_buf_chunk_send(gras_socket_t *sd,
39 gras_error_t gras_trp_buf_chunk_recv(gras_socket_t *sd,
42 gras_error_t gras_trp_buf_flush(gras_socket_t *sock);
46 *** Specific plugin part
50 gras_trp_plugin_t *super;
51 } gras_trp_buf_plug_data_t;
54 *** Specific socket part
60 int pos; /* for receive; not exchanged over the net */
63 struct gras_trp_bufdata_{
69 gras_error_t gras_trp_buf_init_sock(gras_socket_t *sock) {
70 gras_trp_bufdata_t *data=malloc(sizeof(gras_trp_bufdata_t));
76 if (!(data->in.data = malloc(data->buffsize)))
78 data->in.pos = 0; /* useless, indeed, since size==pos */
80 if (!(data->out.data = malloc(data->buffsize)))
83 // data->buffsize = 32 * 1024 - 4; /* default socket buffsize (32k) - headers */
84 data->buffsize = 100 * 1024 ; /* 100k */
94 gras_trp_buf_setup(gras_trp_plugin_t *plug) {
96 gras_trp_buf_plug_data_t *data =malloc(sizeof(gras_trp_buf_plug_data_t));
101 TRY(gras_trp_plugin_get_by_name(gras_if_RL() ? "tcp" : "sg",
103 DEBUG1("Derivate a buffer plugin from %s",gras_if_RL() ? "tcp" : "sg");
105 plug->socket_client = gras_trp_buf_socket_client;
106 plug->socket_server = gras_trp_buf_socket_server;
107 plug->socket_accept = gras_trp_buf_socket_accept;
108 plug->socket_close = gras_trp_buf_socket_close;
110 plug->chunk_send = gras_trp_buf_chunk_send;
111 plug->chunk_recv = gras_trp_buf_chunk_recv;
113 plug->flush = gras_trp_buf_flush;
115 plug->data = (void*)data;
121 gras_error_t gras_trp_buf_socket_client(gras_trp_plugin_t *self,
124 /* OUT */ gras_socket_t *sock){
125 gras_error_t errcode;
126 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)self->data)->super;
129 TRY(super->socket_client(super,host,port,sock));
131 TRY(gras_trp_buf_init_sock(sock));
137 * gras_trp_buf_socket_server:
139 * Open a socket used to receive messages.
141 gras_error_t gras_trp_buf_socket_server(gras_trp_plugin_t *self,
143 /* OUT */ gras_socket_t *sock){
144 gras_error_t errcode;
145 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)self->data)->super;
148 TRY(super->socket_server(super,port,sock));
150 TRY(gras_trp_buf_init_sock(sock));
155 gras_trp_buf_socket_accept(gras_socket_t *sock,
156 gras_socket_t **dst) {
157 gras_error_t errcode;
158 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)sock->plugin->data)->super;
161 TRY(super->socket_accept(sock,dst));
162 (*dst)->plugin = sock->plugin;
163 TRY(gras_trp_buf_init_sock(*dst));
167 void gras_trp_buf_socket_close(gras_socket_t *sock){
168 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)sock->plugin->data)->super;
169 gras_trp_bufdata_t *data=sock->bufdata;
172 if (data->in.size || data->out.size)
173 gras_trp_buf_flush(sock);
177 free(data->out.data);
180 return super->socket_close(sock);
184 * gras_trp_buf_chunk_send:
186 * Send data on a TCP socket
189 gras_trp_buf_chunk_send(gras_socket_t *sock,
193 gras_error_t errcode;
194 gras_trp_bufdata_t *data=(gras_trp_bufdata_t*)sock->bufdata;
198 /* Let underneath plugin check for direction, we work even in duplex */
199 gras_assert0(size >= 0, "Cannot send a negative amount of data");
201 while (chunk_pos < size) {
202 /* size of the chunck to receive in that shot */
203 long int thissize = min(size-chunk_pos,data->buffsize - data->out.size);
204 DEBUG5("Set the chars %d..%ld into the buffer (size=%ld, ctn='%.*s')",
206 ((int)data->out.size) + thissize -1,
207 size, chunk_pos, chunk);
209 memcpy(data->out.data + data->out.size, chunk + chunk_pos, thissize);
211 data->out.size += thissize;
212 chunk_pos += thissize;
213 DEBUG5("New pos = %d; Still to send = %ld of %ld; ctn sofar='%.*s'",
214 data->out.size,size-chunk_pos,size,(int)chunk_pos,chunk);
216 if (data->out.size == data->buffsize) /* out of space. Flush it */
217 TRY(gras_trp_buf_flush(sock));
225 * gras_trp_buf_chunk_recv:
227 * Receive data on a TCP socket.
230 gras_trp_buf_chunk_recv(gras_socket_t *sock,
234 gras_error_t errcode;
235 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)sock->plugin->data)->super;
236 gras_trp_bufdata_t *data=sock->bufdata;
237 long int chunck_pos = 0;
239 /* Let underneath plugin check for direction, we work even in duplex */
240 gras_assert0(sock, "Cannot recv on an NULL socket");
241 gras_assert0(size >= 0, "Cannot receive a negative amount of data");
245 while (chunck_pos < size) {
246 /* size of the chunck to receive in that shot */
249 if (data->in.size == data->in.pos) { /* out of data. Get more */
251 DEBUG0("Recv the size");
252 TRY(super->chunk_recv(sock,(char*)&nextsize, 4));
253 data->in.size = ntohl(nextsize);
255 VERB1("Recv the chunk (size=%d)",data->in.size);
256 TRY(super->chunk_recv(sock, data->in.data, data->in.size));
260 thissize = min(size-chunck_pos , data->in.size - data->in.pos);
261 DEBUG2("Get the chars %d..%ld out of the buffer",
263 data->in.pos + thissize - 1);
264 memcpy(chunk+chunck_pos, data->in.data + data->in.pos, thissize);
266 data->in.pos += thissize;
267 chunck_pos += thissize;
268 DEBUG5("New pos = %d; Still to receive = %ld of %ld. Ctn so far='%.*s'",
269 data->in.pos,size - chunck_pos,size,(int)chunck_pos,chunk);
277 * gras_trp_buf_flush:
279 * Make sure the data is sent
282 gras_trp_buf_flush(gras_socket_t *sock) {
283 gras_error_t errcode;
285 gras_trp_plugin_t *super=((gras_trp_buf_plug_data_t*)sock->plugin->data)->super;
286 gras_trp_bufdata_t *data=sock->bufdata;
289 size = htonl(data->out.size);
290 DEBUG1("Send the size (=%d)",data->out.size);
291 TRY(super->chunk_send(sock,(char*) &size, 4));
293 DEBUG1("Send the chunk (size=%d)",data->out.size);
294 TRY(super->chunk_send(sock, data->out.data, data->out.size));
295 VERB1("Chunk sent (size=%d)",data->out.size);