How to scp(transfer) file by a libssh? - c++

Question

I am trying to transfer compiled executable file (compiled code c++, that prints 'Hello World!') to openssh linux server by using library libssh(I cant use terminal scp of openssh). I know, that libssh has a scp functions to transfer file from and to remoted ssh server. However there is some errors. This is a code of scp:
void ext(const char*c){
std::cout<<c;
exit(-5);
}
int scp_do(ssh_session session);
int scp_copy(ssh_session session, ssh_scp scp);
int main(){
int p = 22;
ssh_session session = ssh_new();
if (session == NULL)
exit(-1);
ssh_options_set(session, SSH_OPTIONS_HOST, "192.168.0.106");
ssh_options_set(session, SSH_OPTIONS_PORT, &p);
ssh_options_set(session, SSH_OPTIONS_USER, "user");
int rc = ssh_connect(session);
if (rc != SSH_OK){ //if not connected - exit
ssh_disconnect(session);
ext("Error connecting");
}
rc = ssh_userauth_password(session, NULL, "passwd");
if(rc != SSH_AUTH_SUCCESS){ //if not authed - exit
ssh_disconnect(session);
ssh_free(session);
return 0;
}
scp_do(session); //copying file, main task of this code
ssh_disconnect(session);
ssh_free(session);
return 0 ;
}
int scp_do(ssh_session session){ //copying file, main task of this code
ssh_scp scp;
int rc;
scp = ssh_scp_new(session, SSH_SCP_WRITE | SSH_SCP_RECURSIVE, ".");
if (scp == NULL)
ext("Error allocating scp session");
rc = ssh_scp_init(scp);
if (rc != SSH_OK)
ext("Error initializing scp session");
char buffer[1024];
std::ifstream fin("hello"); // compiled executable file('hello world'), that I want to sent to server
rc = ssh_scp_push_file(scp, "hello", 1024, S_IRUSR | S_IWUSR); //creating server's file to copy there
if (rc != SSH_OK)
ext("Can't open remote file");
fin.get(buffer, 1024); //reading from client's file
rc = ssh_scp_write(scp, buffer, 1024); //copying all compiled code to server file
if (rc != SSH_OK)
ext("Can't write to remote file");
ssh_scp_close(scp);
ssh_scp_free(scp);
return SSH_OK;
}
When I am trying to execute a transferred file on server, Firstly, I discover it is not
executable. So I am doing chmod +x for file. Secondly, When i am executing file, I am getting error:
[1] 6867 segmentation fault ./hello
However, when I am using scp of openssh to transfer file, there's no errors and it's executable. What can I do to solve my problems?

Answer 1

The size of file is like
4 62 17168 hello
I was thinking it will be less 1024 bytes, bcs it's a just hello world). So, i need only to send 17168 bytes.