Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 1997 - 2001 Pekka Riikonen
+ Copyright (C) 1997 - 2005 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; either version 2 of the License, or
- (at your option) any later version.
-
+ 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
#include "silcincludes.h"
/* Writes data from encrypted buffer to the socket connection. If the
- data cannot be written at once, it will be written later with a timeout.
+ data cannot be written at once, it will be written later with a timeout.
The data is written from the data section of the buffer, not from head
or tail section. This automatically pulls the data section towards end
after writing the data. */
int fd = sock->sock;
SilcBuffer src = sock->outbuf;
+ if (!src)
+ return -1;
if (SILC_IS_DISABLED(sock))
return -1;
if (src->len > 0) {
ret = write(fd, src->data, src->len);
if (ret < 0) {
- if (errno == EAGAIN) {
+ if (errno == EAGAIN || errno == EINTR) {
SILC_LOG_DEBUG(("Could not write immediately, will do it later"));
return -2;
}
SILC_LOG_DEBUG(("Cannot write to socket: %s", strerror(errno)));
+ sock->sock_error = errno;
return -1;
}
+ if (ret < src->len) {
+ SILC_LOG_DEBUG(("Wrote data %d of %d bytes, will write rest later",
+ ret, src->len));
+ silc_buffer_pull(src, ret);
+ return -2;
+ }
+
silc_buffer_pull(src, ret);
}
return ret;
}
+/* QoS read handler, this will call the read and write events to indicate
+ that data is available again after a timeout. */
+
+SILC_TASK_CALLBACK(silc_socket_read_qos)
+{
+ SilcSocketConnectionQos qos = context;
+ SilcSocketConnection sock = qos->sock;
+ qos->applied = TRUE;
+ if (sock->users > 1)
+ silc_schedule_set_listen_fd(qos->schedule, sock->sock,
+ (SILC_TASK_READ | SILC_TASK_WRITE), TRUE);
+ else
+ silc_schedule_unset_listen_fd(qos->schedule, sock->sock);
+ qos->applied = FALSE;
+ silc_socket_free(sock);
+}
+
/* Reads data from the socket connection into the incoming data buffer.
It reads as much as possible from the socket connection. This returns
amount of bytes read or -1 on error or -2 on case where all of the
if (SILC_IS_DISABLED(sock))
return -1;
+ /* If QoS was applied to socket then return earlier read data but apply
+ QoS to it too, if necessary. */
+ if (sock->qos) {
+ if (sock->qos->applied) {
+ if (sock->qos->data_len) {
+ /* Pull hidden data since we have it from earlier QoS apply */
+ silc_buffer_pull_tail(sock->inbuf, sock->qos->data_len);
+ len = sock->qos->data_len;
+ sock->qos->data_len = 0;
+ }
+
+ if (sock->inbuf->len - len > sock->qos->read_limit_bytes) {
+ /* Seems we need to apply QoS for the remaining data as well */
+ silc_socket_dup(sock);
+ silc_schedule_task_add(sock->qos->schedule, sock->sock,
+ silc_socket_read_qos, sock->qos,
+ sock->qos->limit_sec, sock->qos->limit_usec,
+ SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
+ silc_schedule_unset_listen_fd(sock->qos->schedule, sock->sock);
+
+ /* Hide the rest of the data from the buffer. */
+ sock->qos->data_len = (sock->inbuf->len - len -
+ sock->qos->read_limit_bytes);
+ silc_buffer_push_tail(sock->inbuf, sock->qos->data_len);
+ }
+
+ if (sock->inbuf->len)
+ return sock->inbuf->len;
+ }
+
+ /* If we were called and we have active QoS data pending, return
+ with no data */
+ if (sock->qos->data_len) {
+ silc_schedule_unset_listen_fd(sock->qos->schedule, sock->sock);
+ return -2;
+ }
+ }
+
SILC_LOG_DEBUG(("Reading data from socket %d", fd));
/* Read the data from the socket. */
return -2;
}
SILC_LOG_DEBUG(("Cannot read from socket: %d:%s", fd, strerror(errno)));
+ sock->sock_error = errno;
return -1;
}
if (!sock->inbuf)
sock->inbuf = silc_buffer_alloc(SILC_SOCKET_BUF_SIZE);
-
+
/* If the data does not fit to the buffer reallocate it */
if ((sock->inbuf->end - sock->inbuf->tail) < len)
- sock->inbuf = silc_buffer_realloc(sock->inbuf, sock->inbuf->truelen +
+ sock->inbuf = silc_buffer_realloc(sock->inbuf, sock->inbuf->truelen +
(len * 2));
silc_buffer_put_tail(sock->inbuf, buf, len);
silc_buffer_pull_tail(sock->inbuf, len);
SILC_LOG_DEBUG(("Read %d bytes", len));
+ /* Apply QoS to the read data if necessary */
+ if (sock->qos) {
+ struct timeval curtime;
+ silc_gettimeofday(&curtime);
+
+ /* If we have passed the rate time limit, set our new time limit,
+ and zero the rate limit. */
+ if (!silc_compare_timeval(&curtime, &sock->qos->next_limit)) {
+ curtime.tv_sec++;
+ sock->qos->next_limit = curtime;
+ sock->qos->cur_rate = 0;
+ }
+ sock->qos->cur_rate++;
+
+ /* If we are not withing rate limit apply QoS for the read data */
+ if (sock->qos->cur_rate > sock->qos->read_rate) {
+ silc_socket_dup(sock);
+ silc_schedule_task_add(sock->qos->schedule, sock->sock,
+ silc_socket_read_qos, sock->qos,
+ sock->qos->limit_sec, sock->qos->limit_usec,
+ SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
+ silc_schedule_unset_listen_fd(sock->qos->schedule, sock->sock);
+
+ /* Check the byte limit as well, and do not return more than allowed */
+ if (sock->inbuf->len > sock->qos->read_limit_bytes) {
+ /* Hide the rest of the data from the buffer. */
+ sock->qos->data_len = sock->inbuf->len - sock->qos->read_limit_bytes;
+ silc_buffer_push_tail(sock->inbuf, sock->qos->data_len);
+ len = sock->inbuf->len;
+ } else {
+ /* Rate limit kicked in, do not return data yet */
+ return -2;
+ }
+ } else {
+ /* Check the byte limit, and do not return more than allowed */
+ if (sock->inbuf->len > sock->qos->read_limit_bytes) {
+ silc_socket_dup(sock);
+ silc_schedule_task_add(sock->qos->schedule, sock->sock,
+ silc_socket_read_qos, sock->qos,
+ sock->qos->limit_sec, sock->qos->limit_usec,
+ SILC_TASK_TIMEOUT, SILC_TASK_PRI_LOW);
+ silc_schedule_unset_listen_fd(sock->qos->schedule, sock->sock);
+
+ /* Hide the rest of the data from the buffer. */
+ sock->qos->data_len = sock->inbuf->len - sock->qos->read_limit_bytes;
+ silc_buffer_push_tail(sock->inbuf, sock->qos->data_len);
+ len = sock->inbuf->len;
+ }
+ }
+ }
+
return len;
}
+
+/* Returns human readable socket error message */
+
+bool silc_socket_get_error(SilcSocketConnection sock, char *error,
+ SilcUInt32 error_len)
+{
+ char *err;
+
+ if (!sock->sock_error)
+ return FALSE;
+
+ err = strerror(sock->sock_error);
+ if (strlen(err) > error_len)
+ return FALSE;
+
+ memset(error, 0, error_len);
+ memcpy(error, err, strlen(err));
+ return TRUE;
+}
projects / silc.git / blobdiff