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https://git.libssh.org/projects/libssh.git
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first import
git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@1 7dcaeef0-15fb-0310-b436-a5af3365683c
This commit is contained in:
Aris Adamantiadis
701
libssh/channels.c
Normal file
701
libssh/channels.c
Normal file
@@ -0,0 +1,701 @@
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/* channels.c */
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/* It has support for ... ssh channels */
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/*
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Copyright 2003 Aris Adamantiadis
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This file is part of the SSH Library
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The SSH Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The SSH Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the SSH Library; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <string.h>
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#include <stdlib.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "libssh/priv.h"
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#include "libssh/ssh2.h"
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#define WINDOWLIMIT 1024
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#define WINDOWBASE 32000
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CHANNEL *channel_new(SSH_SESSION *session){
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CHANNEL *channel=malloc(sizeof(CHANNEL));
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memset(channel,0,sizeof(CHANNEL));
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channel->session=session;
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channel->version=session->version;
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channel->stdout_buffer=buffer_new();
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channel->stderr_buffer=buffer_new();
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if(!session->channels){
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session->channels=channel;
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channel->next=channel->prev=channel;
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return channel;
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}
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channel->next=session->channels;
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channel->prev=session->channels->prev;
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channel->next->prev=channel;
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channel->prev->next=channel;
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return channel;
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}
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static u32 channel_new_id(SSH_SESSION *session){
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u32 ret=session->maxchannel;
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session->maxchannel++;
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return ret;
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}
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static int channel_open(CHANNEL *channel,char *type_c,int window,
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int maxpacket,BUFFER *payload){
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SSH_SESSION *session=channel->session;
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STRING *type=string_from_char(type_c);
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u32 foo;
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int err;
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packet_clear_out(session);
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buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_OPEN);
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channel->local_channel=channel_new_id(session);
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channel->local_maxpacket=maxpacket;
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channel->local_window=window;
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ssh_say(2,"creating a channel %d with %d window and %d max packet\n",
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channel->local_channel, window,maxpacket);
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buffer_add_ssh_string(session->out_buffer,type);
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buffer_add_u32(session->out_buffer,htonl(channel->local_channel));
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buffer_add_u32(session->out_buffer,htonl(channel->local_window));
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buffer_add_u32(session->out_buffer,htonl(channel->local_maxpacket));
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free(type);
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if(payload)
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buffer_add_buffer(session->out_buffer,payload);
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packet_send(session);
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ssh_say(2,"Sent a SSH_MSG_CHANNEL_OPEN type %s for channel %d\n",type_c,channel->local_channel);
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err=packet_wait(session,SSH2_MSG_CHANNEL_OPEN_CONFIRMATION,1);
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switch(session->in_packet.type){
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case SSH2_MSG_CHANNEL_OPEN_CONFIRMATION:
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buffer_get_u32(session->in_buffer,&foo);
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if(channel->local_channel!=ntohl(foo)){
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ssh_set_error(session,SSH_FATAL,"server answered with sender chan num %d instead of given %d",
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ntohl(foo),channel->local_channel);
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return -1;
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}
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buffer_get_u32(session->in_buffer,&foo);
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channel->remote_channel=ntohl(foo);
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buffer_get_u32(session->in_buffer,&foo);
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channel->remote_window=ntohl(foo);
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buffer_get_u32(session->in_buffer,&foo);
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channel->remote_maxpacket=ntohl(foo);
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ssh_say(3,"Received a CHANNEL_OPEN_CONFIRMATION for channel %d:%d\n"
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,channel->local_channel,channel->remote_channel);
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ssh_say(3,"Remote window : %ld, maxpacket : %ld\n",
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channel->remote_window, channel->remote_maxpacket);
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channel->open=1;
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return 0;
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case SSH2_MSG_CHANNEL_OPEN_FAILURE:
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{
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u32 code;
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STRING *error_s;
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char *error;
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buffer_get_u32(session->in_buffer,&foo);
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buffer_get_u32(session->in_buffer,&code);
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error_s=buffer_get_ssh_string(session->in_buffer);
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error=string_to_char(error_s);
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ssh_set_error(session,SSH_REQUEST_DENIED,"Channel opening failure : channel %d error (%d) %s",
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channel->local_channel,ntohl(code),error);
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free(error);
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free(error_s);
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return -1;
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}
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default:
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ssh_set_error(session,SSH_FATAL,"Received unknown packet %d\n",session->in_packet.type);
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return -1;
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}
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return -1;
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}
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static CHANNEL *find_local_channel(SSH_SESSION *session,u32 num){
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// we assume we are always the local
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CHANNEL *initchan,*channel;
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initchan=session->channels;
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if(!initchan)
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return NULL;
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for(channel=initchan;channel->local_channel!=num;channel=channel->next){
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if(channel->next==initchan)
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return NULL;
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}
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return channel;
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}
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static void grow_window(SSH_SESSION *session, CHANNEL *channel){
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u32 new_window=WINDOWBASE;
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packet_clear_out(session);
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buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_WINDOW_ADJUST);
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buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
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buffer_add_u32(session->out_buffer,htonl(new_window));
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packet_send(session);
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ssh_say(3,"growing window (channel %d:%d) to %d bytes\n",
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channel->local_channel,channel->remote_channel,
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channel->local_window + new_window);
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channel->local_window+=new_window;
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}
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static CHANNEL *channel_from_msg(SSH_SESSION *session){
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u32 chan;
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CHANNEL *channel;
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if (buffer_get_u32(session->in_buffer,&chan)!=sizeof(u32)){
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ssh_set_error(session,SSH_FATAL,"Getting channel from message : short read");
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return NULL;
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}
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channel=find_local_channel(session,ntohl(chan));
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if(!channel)
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ssh_set_error(session,SSH_FATAL,"Server specified invalid channel %d",ntohl(chan));
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return channel;
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}
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static void channel_rcv_change_window(SSH_SESSION *session){
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u32 bytes;
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CHANNEL *channel;
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int err;
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channel=channel_from_msg(session);
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if(!channel)
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ssh_say(0,"%s\n",ssh_get_error(session));
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err = buffer_get_u32(session->in_buffer,&bytes);
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if(!channel || err!= sizeof(u32)){
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ssh_say(1,"Error getting a window adjust message : invalid packet\n");
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return;
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}
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bytes=ntohl(bytes);
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ssh_say(3,"Adding %d bytes to channel (%d:%d) (from %d bytes)\n",bytes,
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channel->local_channel,channel->remote_channel,channel->remote_window);
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channel->remote_window+=bytes;
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}
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/* is_stderr is set to 1 if the data are extended, ie stderr */
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static void channel_rcv_data(SSH_SESSION *session,int is_stderr){
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STRING *str;
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CHANNEL *channel;
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channel=channel_from_msg(session);
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if(!channel){
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ssh_say(0,"%s",ssh_get_error(session));
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return;
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}
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if(is_stderr){
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u32 ignore;
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/* uint32 data type code. we can ignore it */
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buffer_get_u32(session->in_buffer,&ignore);
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}
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str=buffer_get_ssh_string(session->in_buffer);
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if(!str){
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ssh_say(0,"Invalid data packet !\n");
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return;
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}
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ssh_say(3,"adding %d bytes data in %d\n",string_len(str),is_stderr);
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/* what shall we do in this case ? let's accept it anyway */
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if(string_len(str)>channel->local_window)
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ssh_say(0,"Data packet too big for our window(%d vs %d)",string_len(str),channel->local_window);
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channel_default_bufferize(channel,str->string,string_len(str), is_stderr);
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if(string_len(str)>=channel->local_window)
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channel->local_window-=string_len(str);
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else
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channel->local_window=0; /* buggy remote */
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if(channel->local_window < WINDOWLIMIT)
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grow_window(session,channel); /* i wonder if this is the correct place to do that */
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free(str);
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}
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static void channel_rcv_eof(SSH_SESSION *session){
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CHANNEL *channel;
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channel=channel_from_msg(session);
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if(!channel){
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ssh_say(0,"%s\n",ssh_get_error(session));
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return;
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}
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ssh_say(2,"Received eof on channel (%d:%d)\n",channel->local_channel,
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channel->remote_channel);
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// channel->remote_window=0;
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channel->remote_eof=1;
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}
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static void channel_rcv_close(SSH_SESSION *session){
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CHANNEL *channel;
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channel=channel_from_msg(session);
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if(!channel){
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ssh_say(0,"%s\n",ssh_get_error(session));
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return;
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}
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ssh_say(2,"Received close on channel (%d:%d)\n",channel->local_channel,
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channel->remote_channel);
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if((channel->stdout_buffer && buffer_get_rest_len(channel->stdout_buffer)>0)
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|| (channel->stderr_buffer && buffer_get_rest_len(channel->stderr_buffer)>0))
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channel->delayed_close=1;
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else
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channel->open=0;
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if(!channel->remote_eof)
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ssh_say(2,"Remote host not polite enough to send an eof before close\n");
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channel->remote_eof=1;
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/* the remote eof doesn't break things if there was still data into read
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* buffer because the eof is ignored until the buffer is empty. */
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}
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static void channel_rcv_request(SSH_SESSION *session){
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STRING *request_s;
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char *request;
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u32 status;
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CHANNEL *channel=channel_from_msg(session);
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if(!channel){
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ssh_say(1,"%s\n",ssh_get_error(session));
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return;
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}
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request_s=buffer_get_ssh_string(session->in_buffer);
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if(!request_s){
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ssh_say(0,"Invalid MSG_CHANNEL_REQUEST\n");
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return;
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}
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buffer_get_u8(session->in_buffer,(u8 *)&status);
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request=string_to_char(request_s);
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if(!strcmp(request,"exit-status")){
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buffer_get_u32(session->in_buffer,&status);
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status=ntohl(status);
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/* XXX do something with status, we might need it */
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free(request_s);
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free(request);
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return ;
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}
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if(!strcmp(request,"exit-signal")){
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STRING *signal_s;
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char *signal;
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char *core="(core dumped)";
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u8 i;
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signal_s=buffer_get_ssh_string(session->in_buffer);
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if(!signal_s){
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ssh_say(0,"Invalid MSG_CHANNEL_REQUEST\n");
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free(request_s);
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free(request);
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return;
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}
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signal=string_to_char(signal_s);
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buffer_get_u8(session->in_buffer,&i);
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if(!i)
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core="";
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ssh_say(0,"Remote connection closed by signal SIG%s %s\n",signal,core);
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free(signal_s);
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free(signal);
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free(request_s);
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free(request);
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return;
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}
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ssh_say(0,"Unknown request %s\n",request);
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free(request_s);
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free(request);
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}
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/* channel_handle is called by wait_packet, ie, when there is channel informations to handle . */
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void channel_handle(SSH_SESSION *session, int type){
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ssh_say(3,"Channel_handle(%d)\n",type);
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switch(type){
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case SSH2_MSG_CHANNEL_WINDOW_ADJUST:
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channel_rcv_change_window(session);
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break;
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case SSH2_MSG_CHANNEL_DATA:
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channel_rcv_data(session,0);
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break;
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case SSH2_MSG_CHANNEL_EXTENDED_DATA:
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channel_rcv_data(session,1);
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break;
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case SSH2_MSG_CHANNEL_EOF:
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channel_rcv_eof(session);
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break;
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case SSH2_MSG_CHANNEL_CLOSE:
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channel_rcv_close(session);
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||||
break;
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||||
case SSH2_MSG_CHANNEL_REQUEST:
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channel_rcv_request(session);
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break;
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default:
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ssh_say(0,"Unexpected message %d\n",type);
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||||
}
|
||||
}
|
||||
|
||||
/* when data has been received from the ssh server, it can be applied to the known
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user function, with help of the callback, or inserted here */
|
||||
/* XXX is the window changed ? */
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||||
void channel_default_bufferize(CHANNEL *channel, void *data, int len, int is_stderr){
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ssh_say(3,"placing %d bytes into channel buffer (stderr=%d)\n",len,is_stderr);
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||||
if(!is_stderr){
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||||
/* stdout */
|
||||
if(!channel->stdout_buffer)
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channel->stdout_buffer=buffer_new();
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buffer_add_data(channel->stdout_buffer,data,len);
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||||
} else {
|
||||
/* stderr */
|
||||
if(!channel->stderr_buffer)
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||||
channel->stderr_buffer=buffer_new();
|
||||
buffer_add_data(channel->stderr_buffer,data,len);
|
||||
}
|
||||
}
|
||||
|
||||
int channel_open_session(CHANNEL *channel){
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->session->version==2)
|
||||
#endif
|
||||
return channel_open(channel,"session",64000,32000,NULL);
|
||||
#ifdef HAVE_SSH1
|
||||
else
|
||||
return channel_open_session1(channel);
|
||||
#endif
|
||||
}
|
||||
|
||||
/* tcpip forwarding */
|
||||
|
||||
int channel_open_forward(CHANNEL *channel,char *remotehost, int remoteport, char *sourcehost, int localport){
|
||||
BUFFER *payload=buffer_new();
|
||||
STRING *str=string_from_char(remotehost);
|
||||
int ret;
|
||||
buffer_add_ssh_string(payload,str);
|
||||
free(str);
|
||||
str=string_from_char(sourcehost);
|
||||
buffer_add_u32(payload,htonl(remoteport));
|
||||
buffer_add_ssh_string(payload,str);
|
||||
free(str);
|
||||
buffer_add_u32(payload,htonl(localport));
|
||||
ret=channel_open(channel,"direct-tcpip",64000,32000,payload);
|
||||
buffer_free(payload);
|
||||
return ret;
|
||||
}
|
||||
|
||||
|
||||
void channel_free(CHANNEL *channel){
|
||||
SSH_SESSION *session=channel->session;
|
||||
if(session->alive && channel->open)
|
||||
channel_close(channel);
|
||||
/* handle the "my channel is first on session list" case */
|
||||
if(session->channels==channel)
|
||||
session->channels=channel->next;
|
||||
/* handle the "my channel is the only on session list" case */
|
||||
if(channel->next == channel){
|
||||
session->channels=NULL;
|
||||
} else {
|
||||
channel->prev->next=channel->next;
|
||||
channel->next->prev=channel->prev;
|
||||
}
|
||||
if(channel->stdout_buffer)
|
||||
buffer_free(channel->stdout_buffer);
|
||||
if(channel->stderr_buffer)
|
||||
buffer_free(channel->stderr_buffer);
|
||||
/* debug trick to catch use after frees */
|
||||
memset(channel,'X',sizeof(CHANNEL));
|
||||
free(channel);
|
||||
}
|
||||
|
||||
int channel_send_eof(CHANNEL *channel){
|
||||
SSH_SESSION *session=channel->session;
|
||||
int ret;
|
||||
packet_clear_out(session);
|
||||
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_EOF);
|
||||
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
|
||||
ret=packet_send(session);
|
||||
ssh_say(1,"Sent a EOF on client channel (%d:%d)\n",channel->local_channel,
|
||||
channel->remote_channel);
|
||||
channel->local_eof=1;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int channel_close(CHANNEL *channel){
|
||||
SSH_SESSION *session=channel->session;
|
||||
int ret=0;
|
||||
if(!channel->local_eof)
|
||||
ret=channel_send_eof(channel);
|
||||
if(ret)
|
||||
return ret;
|
||||
packet_clear_out(session);
|
||||
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_CLOSE);
|
||||
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
|
||||
ret=packet_send(session);
|
||||
ssh_say(1,"Sent a close on client channel (%d:%d)\n",channel->local_channel,
|
||||
channel->remote_channel);
|
||||
if(!ret)
|
||||
channel->open =0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Blocking write */
|
||||
/* The exact len is written */
|
||||
int channel_write(CHANNEL *channel ,void *data,int len){
|
||||
SSH_SESSION *session=channel->session;
|
||||
int effectivelen;
|
||||
int origlen=len;
|
||||
if(channel->local_eof){
|
||||
ssh_set_error(session,SSH_REQUEST_DENIED,"Can't write to channel %d:%d"
|
||||
" after EOF was sent",channel->local_channel,channel->remote_channel);
|
||||
return -1;
|
||||
}
|
||||
if(!channel->open || channel->delayed_close){
|
||||
ssh_set_error(session,SSH_REQUEST_DENIED,"Remote channel is closed");
|
||||
return -1;
|
||||
}
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->version==1)
|
||||
return channel_write1(channel,data,len);
|
||||
#endif
|
||||
while(len >0){
|
||||
if(channel->remote_window<len){
|
||||
ssh_say(2,"Remote window is %d bytes. going to write %d bytes\n",
|
||||
channel->remote_window,len);
|
||||
ssh_say(2,"Waiting for a growing window message...\n");
|
||||
// wonder what happens when the channel window is zero
|
||||
while(channel->remote_window==0){
|
||||
// parse every incoming packet
|
||||
packet_wait(channel->session,0,0);
|
||||
}
|
||||
effectivelen=len>channel->remote_window?channel->remote_window:len;
|
||||
} else
|
||||
effectivelen=len;
|
||||
packet_clear_out(session);
|
||||
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_DATA);
|
||||
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
|
||||
buffer_add_u32(session->out_buffer,htonl(effectivelen));
|
||||
buffer_add_data(session->out_buffer,data,effectivelen);
|
||||
packet_send(session);
|
||||
ssh_say(2,"channel_write wrote %d bytes\n",effectivelen);
|
||||
channel->remote_window-=effectivelen;
|
||||
len -= effectivelen;
|
||||
data+=effectivelen;
|
||||
}
|
||||
return origlen;
|
||||
}
|
||||
|
||||
int channel_is_open(CHANNEL *channel){
|
||||
return (channel->open!=0);
|
||||
}
|
||||
|
||||
int channel_is_eof(CHANNEL *channel){
|
||||
if((channel->stdout_buffer && buffer_get_rest_len(channel->stdout_buffer)
|
||||
>0) || (channel->stderr_buffer && buffer_get_rest_len(
|
||||
channel->stderr_buffer)>0))
|
||||
return 0;
|
||||
return (channel->remote_eof!=0);
|
||||
}
|
||||
|
||||
void channel_set_blocking(CHANNEL *channel, int blocking){
|
||||
channel->blocking=blocking;
|
||||
}
|
||||
|
||||
static int channel_request(CHANNEL *channel,char *request, BUFFER *buffer,int reply){
|
||||
STRING *request_s=string_from_char(request);
|
||||
SSH_SESSION *session=channel->session;
|
||||
int err;
|
||||
packet_clear_out(session);
|
||||
buffer_add_u8(session->out_buffer,SSH2_MSG_CHANNEL_REQUEST);
|
||||
buffer_add_u32(session->out_buffer,htonl(channel->remote_channel));
|
||||
buffer_add_ssh_string(session->out_buffer,request_s);
|
||||
buffer_add_u8(session->out_buffer,reply?1:0);
|
||||
if(buffer)
|
||||
buffer_add_data(session->out_buffer,buffer_get(buffer),buffer_get_len(buffer));
|
||||
packet_send(session);
|
||||
ssh_say(3,"Sent a SSH_MSG_CHANNEL_REQUEST %s\n",request);
|
||||
free(request_s);
|
||||
if(!reply)
|
||||
return 0;
|
||||
err=packet_wait(session,SSH2_MSG_CHANNEL_SUCCESS,1);
|
||||
if(err)
|
||||
if(session->in_packet.type==SSH2_MSG_CHANNEL_FAILURE){
|
||||
ssh_say(2,"%s channel request failed\n",request);
|
||||
ssh_set_error(session,SSH_REQUEST_DENIED,"Channel request %s failed",request);
|
||||
}
|
||||
else
|
||||
ssh_say(3,"Received an unexpected %d message\n",session->in_packet.type);
|
||||
else
|
||||
ssh_say(3,"Received a SUCCESS\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
int channel_request_pty_size(CHANNEL *channel, char *terminal, int col, int row){
|
||||
STRING *term;
|
||||
BUFFER *buffer;
|
||||
int err;
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->version==1)
|
||||
return channel_request_pty_size1(channel,terminal, col, row);
|
||||
#endif
|
||||
term=string_from_char(terminal);
|
||||
buffer=buffer_new();
|
||||
buffer_add_ssh_string(buffer,term);
|
||||
buffer_add_u32(buffer,htonl(col));
|
||||
buffer_add_u32(buffer,htonl(row));
|
||||
buffer_add_u32(buffer,0);
|
||||
buffer_add_u32(buffer,0);
|
||||
/* a 0byte string */
|
||||
buffer_add_u32(buffer,htonl(1));
|
||||
buffer_add_u8(buffer,0);
|
||||
free(term);
|
||||
err=channel_request(channel,"pty-req",buffer,1);
|
||||
buffer_free(buffer);
|
||||
return err;
|
||||
}
|
||||
|
||||
int channel_request_pty(CHANNEL *channel){
|
||||
return channel_request_pty_size(channel,"xterm",80,24);
|
||||
}
|
||||
|
||||
int channel_change_pty_size(CHANNEL *channel,int cols,int rows){
|
||||
BUFFER *buffer;
|
||||
int err;
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->version==1)
|
||||
return channel_change_pty_size1(channel,cols,rows);
|
||||
#endif
|
||||
buffer=buffer_new();
|
||||
//buffer_add_u8(buffer,0);
|
||||
buffer_add_u32(buffer,htonl(cols));
|
||||
buffer_add_u32(buffer,htonl(rows));
|
||||
buffer_add_u32(buffer,0);
|
||||
buffer_add_u32(buffer,0);
|
||||
err=channel_request(channel,"window-change",buffer,0);
|
||||
buffer_free(buffer);
|
||||
return err;
|
||||
}
|
||||
|
||||
int channel_request_shell(CHANNEL *channel){
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->version==1)
|
||||
return channel_request_shell1(channel);
|
||||
#endif
|
||||
return channel_request(channel,"shell",NULL,1);
|
||||
}
|
||||
|
||||
int channel_request_subsystem(CHANNEL *channel, char *system){
|
||||
BUFFER* buffer=buffer_new();
|
||||
int ret;
|
||||
STRING *subsystem=string_from_char(system);
|
||||
buffer_add_ssh_string(buffer,subsystem);
|
||||
free(subsystem);
|
||||
ret=channel_request(channel,"subsystem",buffer,1);
|
||||
buffer_free(buffer);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int channel_request_sftp( CHANNEL *channel){
|
||||
return channel_request_subsystem(channel, "sftp");
|
||||
}
|
||||
|
||||
|
||||
int channel_request_env(CHANNEL *channel,char *name, char *value){
|
||||
BUFFER *buffer=buffer_new();
|
||||
int ret;
|
||||
STRING *string=string_from_char(name);
|
||||
buffer_add_ssh_string(buffer,string);
|
||||
free(string);
|
||||
string=string_from_char(value);
|
||||
buffer_add_ssh_string(buffer,string);
|
||||
free(string);
|
||||
ret=channel_request(channel,"env",buffer,1);
|
||||
buffer_free(buffer);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int channel_request_exec(CHANNEL *channel, char *cmd){
|
||||
BUFFER *buffer;
|
||||
int ret;
|
||||
#ifdef HAVE_SSH1
|
||||
if(channel->version==1)
|
||||
return channel_request_exec1(channel, cmd);
|
||||
#endif
|
||||
buffer=buffer_new();
|
||||
STRING *command=string_from_char(cmd);
|
||||
buffer_add_ssh_string(buffer,command);
|
||||
free(command);
|
||||
ret=channel_request(channel,"exec",buffer,1);
|
||||
buffer_free(buffer);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* TODO : fix the delayed close thing */
|
||||
/* TODO : fix the blocking behaviours */
|
||||
/* reads into a channel and put result into buffer */
|
||||
/* returns number of bytes read, 0 if eof or such and -1 in case of error */
|
||||
/* if bytes != 0, the exact number of bytes are going to be read */
|
||||
|
||||
int channel_read(CHANNEL *channel, BUFFER *buffer,int bytes,int is_stderr){
|
||||
BUFFER *stdbuf=NULL;
|
||||
int len;
|
||||
buffer_reinit(buffer);
|
||||
/* maybe i should always set a buffer to avoid races between channel_default_bufferize and channel_read */
|
||||
if(is_stderr)
|
||||
stdbuf=channel->stderr_buffer;
|
||||
else
|
||||
stdbuf=channel->stdout_buffer;
|
||||
|
||||
/* block reading if asked bytes=0 */
|
||||
while((buffer_get_rest_len(stdbuf)==0) || (buffer_get_rest_len(stdbuf) < bytes)){
|
||||
if(channel->remote_eof && buffer_get_rest_len(stdbuf)==0)
|
||||
return 0;
|
||||
if(channel->remote_eof)
|
||||
break; /* return the resting bytes in buffer */
|
||||
if(packet_read(channel->session)||packet_translate(channel->session))
|
||||
return -1;
|
||||
packet_parse(channel->session);
|
||||
}
|
||||
|
||||
if(bytes==0){
|
||||
/* write the ful buffer informations */
|
||||
buffer_add_data(buffer,buffer_get_rest(stdbuf),buffer_get_rest_len(stdbuf));
|
||||
buffer_reinit(stdbuf);
|
||||
} else {
|
||||
len=buffer_get_rest_len(stdbuf);
|
||||
len= (len>bytes?bytes:len); /* read bytes bytes if len is greater, everything otherwise */
|
||||
buffer_add_data(buffer,buffer_get_rest(stdbuf),len);
|
||||
buffer_pass_bytes(stdbuf,len);
|
||||
}
|
||||
return buffer_get_len(buffer);
|
||||
}
|
||||
|
||||
/* returns the number of bytes available, 0 if nothing is currently available, -1 if error */
|
||||
int channel_poll(CHANNEL *channel, int is_stderr){
|
||||
BUFFER *buffer;
|
||||
if(is_stderr)
|
||||
buffer=channel->stderr_buffer;
|
||||
else
|
||||
buffer=channel->stdout_buffer;
|
||||
|
||||
while(buffer_get_rest_len(buffer)==0 && !channel->remote_eof){
|
||||
if(ssh_fd_poll(channel->session)){
|
||||
if(packet_read(channel->session)||packet_translate(channel->session))
|
||||
return -1;
|
||||
packet_parse(channel->session);
|
||||
} else
|
||||
return 0; /* nothing is available has said fd_poll */
|
||||
}
|
||||
return buffer_get_len(buffer);
|
||||
}
|
||||
|
||||
/* nonblocking read on the specified channel. it will return <=len bytes of data read
|
||||
atomicly. */
|
||||
int channel_read_nonblocking(CHANNEL *channel, char *dest, int len, int is_stderr){
|
||||
int to_read=channel_poll(channel,is_stderr);
|
||||
int lu;
|
||||
BUFFER *buffer=buffer_new();
|
||||
if(to_read<=0){
|
||||
buffer_free(buffer);
|
||||
return to_read; /* may be an error code */
|
||||
}
|
||||
if(to_read>len)
|
||||
to_read=len;
|
||||
lu=channel_read(channel,buffer,to_read,is_stderr);
|
||||
memcpy(dest,buffer_get(buffer),lu>=0?lu:0);
|
||||
buffer_free(buffer);
|
||||
return lu;
|
||||
}
|
||||
|
||||
SSH_SESSION *channel_get_session(CHANNEL *channel){
|
||||
return channel->session;
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user