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/* main.c */
/* Core of the sftp server */
/*
Copyright 2005 Aris Adamantiadis
This file is part of the SSH Library
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/libssh.h>
#include <libssh/server.h>
#include <libssh/sftp.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include "server.h"
CHANNEL *recv_channel(SSH_SESSION *session){
CHANNEL *chan=NULL;
SSH_MESSAGE *message;
int sftp=0;
do {
message=ssh_message_get(session);
if(message){
switch(ssh_message_type(message)){
case SSH_CHANNEL_REQUEST_OPEN:
if(ssh_message_subtype(message)==SSH_CHANNEL_SESSION){
chan=ssh_message_channel_request_open_reply_accept(message);
break;
}
default:
ssh_message_reply_default(message);
}
ssh_message_free(message);
}
} while(message && !chan);
if(!chan)
return NULL;
do {
message=ssh_message_get(session);
if(message && ssh_message_type(message)==SSH_CHANNEL_REQUEST &&
ssh_message_subtype(message)==SSH_CHANNEL_REQUEST_SUBSYSTEM){
if(!strcmp(ssh_message_channel_request_subsystem(message),"sftp")){
sftp=1;
ssh_message_channel_request_reply_success(message);
break;
}
}
if(!sftp){
ssh_message_reply_default(message);
}
ssh_message_free(message);
} while (message && !sftp);
if(!message)
return NULL;
return chan;
}
void usage(char *prog){
fprintf(stderr,"Usage : %s [-vD] [-f config]\n",prog);
}
int main(int argc, char **argv){
SSH_OPTIONS *options=ssh_options_new();
SSH_SESSION *session;
SSH_BIND *ssh_bind;
CHANNEL *chan=NULL;
SFTP_SESSION *sftp=NULL;
int ret;
int donotfork=0;
char *config="mercurius.conf";
ssh_options_getopt(options,&argc,argv);
while((ret=getopt(argc, argv, "Df:"))!=-1){
switch(ret){
case 'D':
donotfork=1;
break;
case 'f':
config=strdup(optarg);
break;
case '?':
usage(argv[0]);
exit(1);
}
}
if(optind<argc) {
usage(argv[0]);
exit(1);
}
ret=parse_config(config);
if(ret != 0){
printf("Error parsing configuration file\n");
return 1;
}
if(!rsa && !dsa){
printf("There must be at least one RSA or DSA host key\n");
return 1;
}
if(dsa)
ssh_options_set_dsa_server_key(options,dsa);
if(rsa)
ssh_options_set_rsa_server_key(options,rsa);
//printf("port : %d\n",port);
if(port!=0)
ssh_options_set_port(options,port);
ssh_bind=ssh_bind_new();
ssh_bind_set_options(ssh_bind,options);
if(ssh_bind_listen(ssh_bind)<0){
printf("Error listening to socket: %s\n",ssh_get_error(ssh_bind));
return 1;
}
signal(SIGCHLD,SIG_IGN);
if(!donotfork){
ssh_say(1,"Going into background...\n");
if(fork()){
exit(0);
}
}
while(1){
session=ssh_bind_accept(ssh_bind);
if(!session){
printf("error accepting a connection : %s\n",ssh_get_error(ssh_bind));
return 1;
}
if(fork()==0){
break;
}
ssh_silent_disconnect(session);
}
ssh_bind_free(ssh_bind);
//printf("Socket connected : %d\n",ssh_get_fd(session));
if(ssh_accept(session)){
printf("ssh_accept : %s\n",ssh_get_error(session));
return 1;
}
if(do_auth(session)<0){
printf("error : %s\n",ssh_get_error(session));
return 1;
}
ssh_say(1,"user authenticated\n");
chan=recv_channel(session);
if(!chan){
printf("error : %s\n",ssh_get_error(session));
return 1;
}
sftp=sftp_server_new(session,chan);
if(sftp_server_init(sftp)){
printf("error : %s\n",ssh_get_error(session));
return 1;
}
ssh_say(1,"Sftp session open by client\n");
sftploop(session,sftp);
ssh_say(1,"Client disconnected\n");
ssh_disconnect(session);
return 0;
}
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