2009-09-06 15:26:02 +04:00
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/* scp_download.c
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* Sample implementation of a tiny SCP downloader client
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*/
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/*
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Copyright 2009 Aris Adamantiadis
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This file is part of the SSH Library
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You are free to copy this file, modify it in any way, consider it being public
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domain. This does not apply to the rest of the library though, but it is
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allowed to cut-and-paste working code from this file to any license of
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program.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <libssh/libssh.h>
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#include "examples_common.h"
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int verbosity=0;
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const char *createcommand="rm -fr /tmp/libssh_tests && mkdir /tmp/libssh_tests && cd /tmp/libssh_tests && date > a && date > b && mkdir c && date > d";
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char *host=NULL;
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static void usage(const char *argv0){
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fprintf(stderr,"Usage : %s [options] host\n"
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"sample tiny scp downloader client - libssh-%s\n"
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"This program will create files in /tmp and try to fetch them\n",
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// "Options :\n",
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// " -r : use RSA to verify host public key\n",
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argv0,
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ssh_version(0));
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exit(0);
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}
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static int opts(int argc, char **argv){
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int i;
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while((i=getopt(argc,argv,"v"))!=-1){
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switch(i){
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case 'v':
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verbosity++;
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break;
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default:
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fprintf(stderr,"unknown option %c\n",optopt);
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usage(argv[0]);
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return -1;
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}
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}
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host = argv[optind];
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if(host == NULL)
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usage(argv[0]);
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return 0;
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}
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static void create_files(ssh_session session){
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2010-05-14 02:51:08 +04:00
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ssh_channel channel=ssh_channel_new(session);
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2009-09-06 15:26:02 +04:00
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char buffer[1];
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2013-06-17 14:35:42 +04:00
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int rc;
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2009-09-06 15:26:02 +04:00
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if(channel == NULL){
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fprintf(stderr,"Error creating channel: %s\n",ssh_get_error(session));
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exit(EXIT_FAILURE);
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}
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2010-05-14 02:51:08 +04:00
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if(ssh_channel_open_session(channel) != SSH_OK){
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2009-09-06 15:26:02 +04:00
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fprintf(stderr,"Error creating channel: %s\n",ssh_get_error(session));
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2011-04-15 21:05:53 +04:00
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ssh_channel_free(channel);
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2009-09-06 15:26:02 +04:00
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exit(EXIT_FAILURE);
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}
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2010-05-14 02:51:08 +04:00
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if(ssh_channel_request_exec(channel,createcommand) != SSH_OK){
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2009-09-06 15:26:02 +04:00
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fprintf(stderr,"Error executing command: %s\n",ssh_get_error(session));
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2011-04-15 21:05:53 +04:00
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ssh_channel_close(channel);
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ssh_channel_free(channel);
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2009-09-06 15:26:02 +04:00
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exit(EXIT_FAILURE);
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}
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2010-05-14 02:51:08 +04:00
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while(!ssh_channel_is_eof(channel)){
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2013-06-17 14:35:42 +04:00
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rc = ssh_channel_read(channel,buffer,1,1);
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if (rc != 1) {
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fprintf(stderr, "Error reading from channel\n");
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ssh_channel_close(channel);
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ssh_channel_free(channel);
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return;
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}
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rc = write(1, buffer, 1);
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if (rc < 0) {
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2010-03-30 00:46:03 +04:00
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fprintf(stderr, "Error writing to buffer\n");
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2011-04-15 21:05:53 +04:00
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ssh_channel_close(channel);
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ssh_channel_free(channel);
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2010-03-30 00:46:03 +04:00
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return;
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}
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2009-09-06 15:26:02 +04:00
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}
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2010-05-14 02:51:08 +04:00
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ssh_channel_close(channel);
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ssh_channel_free(channel);
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2009-09-06 15:26:02 +04:00
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}
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static int fetch_files(ssh_session session){
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int size;
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char buffer[16384];
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int mode;
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char *filename;
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int r;
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2009-09-06 20:35:40 +04:00
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ssh_scp scp=ssh_scp_new(session, SSH_SCP_READ | SSH_SCP_RECURSIVE, "/tmp/libssh_tests/*");
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2009-09-06 15:26:02 +04:00
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if(ssh_scp_init(scp) != SSH_OK){
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fprintf(stderr,"error initializing scp: %s\n",ssh_get_error(session));
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2011-04-15 21:05:53 +04:00
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ssh_scp_free(scp);
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2009-09-06 15:26:02 +04:00
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return -1;
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}
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printf("Trying to download 3 files (a,b,d) and 1 directory (c)\n");
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do {
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r=ssh_scp_pull_request(scp);
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switch(r){
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case SSH_SCP_REQUEST_NEWFILE:
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size=ssh_scp_request_get_size(scp);
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filename=strdup(ssh_scp_request_get_filename(scp));
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mode=ssh_scp_request_get_permissions(scp);
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printf("downloading file %s, size %d, perms 0%o\n",filename,size,mode);
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free(filename);
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ssh_scp_accept_request(scp);
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r=ssh_scp_read(scp,buffer,sizeof(buffer));
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if(r==SSH_ERROR){
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fprintf(stderr,"Error reading scp: %s\n",ssh_get_error(session));
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2011-04-15 21:05:53 +04:00
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ssh_scp_close(scp);
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ssh_scp_free(scp);
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2009-09-06 15:26:02 +04:00
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return -1;
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}
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printf("done\n");
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break;
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case SSH_ERROR:
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fprintf(stderr,"Error: %s\n",ssh_get_error(session));
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2011-04-15 21:05:53 +04:00
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ssh_scp_close(scp);
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ssh_scp_free(scp);
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2009-09-06 20:43:23 +04:00
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return -1;
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case SSH_SCP_REQUEST_WARNING:
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fprintf(stderr,"Warning: %s\n",ssh_scp_request_get_warning(scp));
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2009-09-06 15:26:02 +04:00
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break;
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case SSH_SCP_REQUEST_NEWDIR:
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filename=strdup(ssh_scp_request_get_filename(scp));
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mode=ssh_scp_request_get_permissions(scp);
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printf("downloading directory %s, perms 0%o\n",filename,mode);
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free(filename);
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ssh_scp_accept_request(scp);
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break;
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2009-09-06 20:35:40 +04:00
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case SSH_SCP_REQUEST_ENDDIR:
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printf("End of directory\n");
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break;
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2009-09-06 15:26:02 +04:00
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case SSH_SCP_REQUEST_EOF:
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printf("End of requests\n");
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goto end;
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}
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} while (1);
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end:
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2011-04-15 21:05:53 +04:00
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ssh_scp_close(scp);
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ssh_scp_free(scp);
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2009-09-06 15:26:02 +04:00
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return 0;
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}
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int main(int argc, char **argv){
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ssh_session session;
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if(opts(argc,argv)<0)
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return EXIT_FAILURE;
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session=connect_ssh(host,NULL,verbosity);
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if(session == NULL)
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return EXIT_FAILURE;
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create_files(session);
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fetch_files(session);
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ssh_disconnect(session);
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2011-04-15 21:05:53 +04:00
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ssh_free(session);
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2009-09-06 15:26:02 +04:00
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ssh_finalize();
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return 0;
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}
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