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/*
* scp - SSH scp wrapper functions
*
* This file is part of the SSH Library
*
* Copyright (c) 2009 by Aris Adamantiadis <aris@0xbadc0de.be>
*
* The SSH Library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The SSH Library 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the SSH Library; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#include "libssh/priv.h"
#include <string.h>
/** @brief Creates a new scp session
* @param session the SSH session to use
* @param mode one of SSH_SCP_WRITE or SSH_SCP_READ, depending if you need to drop files remotely or read them.
* It is not possible to combine read and write.
* @returns NULL if the creation was impossible.
* @returns a ssh_scp handle if it worked.
*/
ssh_scp ssh_scp_new(ssh_session session, int mode, const char *location){
ssh_scp scp=malloc(sizeof(struct ssh_scp_struct));
if(scp == NULL){
ssh_set_error(session,SSH_FATAL,"Error allocating memory for ssh_scp");
return NULL;
}
ZERO_STRUCTP(scp);
if(mode != SSH_SCP_WRITE && mode != SSH_SCP_READ){
ssh_set_error(session,SSH_FATAL,"Invalid mode %d for ssh_scp_new()",mode);
ssh_scp_free(scp);
return NULL;
}
scp->location=strdup(location);
if (scp->location == NULL) {
ssh_set_error(session,SSH_FATAL,"Error allocating memory for ssh_scp");
ssh_scp_free(scp);
return NULL;
}
scp->session=session;
scp->mode=mode;
scp->channel=NULL;
scp->state=SSH_SCP_NEW;
return scp;
}
int ssh_scp_init(ssh_scp scp){
int r;
char execbuffer[1024];
uint8_t code;
if(scp->state != SSH_SCP_NEW){
ssh_set_error(scp->session,SSH_FATAL,"ssh_scp_init called under invalid state");
return SSH_ERROR;
}
scp->channel=channel_new(scp->session);
if(scp->channel == NULL){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
r= channel_open_session(scp->channel);
if(r==SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
if(scp->mode == SSH_SCP_WRITE)
snprintf(execbuffer,sizeof(execbuffer),"scp -t %s",scp->location);
else
snprintf(execbuffer,sizeof(execbuffer),"scp -f %s",scp->location);
if(channel_request_exec(scp->channel,execbuffer) == SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
r=channel_read(scp->channel,&code,1,0);
if(code != 0){
ssh_set_error(scp->session,SSH_FATAL, "scp status code %ud not valid", code);
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
if(scp->mode == SSH_SCP_WRITE)
scp->state=SSH_SCP_WRITE_INITED;
else
scp->state=SSH_SCP_READ_INITED;
return SSH_OK;
}
int ssh_scp_close(ssh_scp scp){
if(scp->channel != NULL){
if(channel_send_eof(scp->channel) == SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
if(channel_close(scp->channel) == SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
channel_free(scp->channel);
scp->channel=NULL;
}
scp->state=SSH_SCP_NEW;
return SSH_OK;
}
void ssh_scp_free(ssh_scp scp){
if(scp->state != SSH_SCP_NEW)
ssh_scp_close(scp);
if(scp->channel)
channel_free(scp->channel);
SAFE_FREE(scp->location);
SAFE_FREE(scp);
}
/** @brief initializes the sending of a file to a scp in sink mode
* @param filename Name of the file being sent. It should not contain any path indicator
* @param size Exact size in bytes of the file being sent.
* @param perms Text form of the unix permissions for the new file, e.g. "0644"
* @returns SSH_OK if the file is ready to be sent.
* @returns SSH_ERROR if an error happened.
*/
int ssh_scp_push_file(ssh_scp scp, const char *filename, size_t size, const char *perms){
char buffer[1024];
int r;
uint8_t code;
if(scp->state != SSH_SCP_WRITE_INITED){
ssh_set_error(scp->session,SSH_FATAL,"ssh_scp_push_file called under invalid state");
return SSH_ERROR;
}
snprintf(buffer,sizeof(buffer),"C%s %ld %s\n",perms, size, filename);
r=channel_write(scp->channel,buffer,strlen(buffer));
if(r==SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
r=channel_read(scp->channel,&code,1,0);
if(code != 0){
ssh_set_error(scp->session,SSH_FATAL, "scp status code %ud not valid", code);
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
scp->filelen = size;
scp->processed = 0;
scp->state=SSH_SCP_WRITE_WRITING;
return SSH_OK;
}
/** @brief Write into a remote scp file
* @param buffer the buffer to write
* @param len the number of bytes to write
* @returns SSH_OK the write was successful
* @returns SSH_ERROR an error happened while writing
*/
int ssh_scp_write(ssh_scp scp, const void *buffer, size_t len){
int w;
//int r;
//uint8_t code;
if(scp->state != SSH_SCP_WRITE_WRITING){
ssh_set_error(scp->session,SSH_FATAL,"ssh_scp_write called under invalid state");
return SSH_ERROR;
}
if(scp->processed + len > scp->filelen)
len = scp->filelen - scp->processed;
/* hack to avoid waiting for window change */
channel_poll(scp->channel,0);
w=channel_write(scp->channel,buffer,len);
if(w != SSH_ERROR)
scp->processed += w;
else {
scp->state=SSH_SCP_ERROR;
//return=channel_get_exit_status(scp->channel);
return SSH_ERROR;
}
/* Check if we arrived at end of file */
if(scp->processed == scp->filelen) {
/* r=channel_read(scp->channel,&code,1,0);
if(r==SSH_ERROR){
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
if(code != 0){
ssh_set_error(scp->session,SSH_FATAL, "scp status code %ud not valid", code);
scp->state=SSH_SCP_ERROR;
return SSH_ERROR;
}
*/
scp->processed=scp->filelen=0;
scp->state=SSH_SCP_WRITE_INITED;
}
return SSH_OK;
}
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