ssh2_echo: new example
This is a new example snippet. The code is largely based on ssh2_exec, and is written by Tommy Lindgren. I edited it into C90 compliance and to conform to libssh2 indent style and some more.
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Daniel Stenberg
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e87293d480
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ac6d0fb706
@ -3,14 +3,10 @@ AUTOMAKE_OPTIONS = foreign nostdinc
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EXTRA_DIST = libssh2_config.h.in
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# samples
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noinst_PROGRAMS = direct_tcpip ssh2 \
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scp scp_nonblock \
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scp_write scp_write_nonblock \
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sftp sftp_nonblock \
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sftp_write sftp_write_nonblock \
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sftp_mkdir sftp_mkdir_nonblock \
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sftp_RW_nonblock \
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sftpdir sftpdir_nonblock ssh2_exec ssh2_agent
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noinst_PROGRAMS = direct_tcpip ssh2 scp scp_nonblock scp_write \
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scp_write_nonblock sftp sftp_nonblock sftp_write sftp_write_nonblock \
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sftp_mkdir sftp_mkdir_nonblock sftp_RW_nonblock sftpdir \
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sftpdir_nonblock ssh2_exec ssh2_agent ssh2_echo
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AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_builddir)/example
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LDADD = $(top_builddir)/src/libssh2.la
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361
example/ssh2_echo.c
Normal file
361
example/ssh2_echo.c
Normal file
@ -0,0 +1,361 @@
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/*
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* $Id: ssh2_exec.c,v 1.4 2009/05/07 20:30:22 bagder Exp $
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*
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* Run it like this:
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*
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* $ ./ssh2_echo 127.0.0.1 user password
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*
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* The code sends a 'cat' command, and then writes a lot of data to it only to
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* check that reading the returned data sums up to the same amount.
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*
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*/
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#include "libssh2_config.h"
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#include <libssh2.h>
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#ifdef HAVE_WINSOCK2_H
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# include <winsock2.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#ifdef HAVE_SYS_SELECT_H
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# include <sys/select.h>
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#endif
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# ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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# include <arpa/inet.h>
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#endif
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#include <sys/time.h>
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#include <sys/types.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ctype.h>
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static int waitsocket(int socket_fd, LIBSSH2_SESSION *session)
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{
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struct timeval timeout;
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int rc;
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fd_set fd;
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fd_set *writefd = NULL;
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fd_set *readfd = NULL;
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int dir;
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timeout.tv_sec = 10;
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timeout.tv_usec = 0;
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FD_ZERO(&fd);
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FD_SET(socket_fd, &fd);
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/* now make sure we wait in the correct direction */
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dir = libssh2_session_block_directions(session);
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if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)
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readfd = &fd;
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if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)
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writefd = &fd;
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rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);
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return rc;
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}
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#define BUFSIZE 32000
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int main(int argc, char *argv[])
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{
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const char *hostname = "127.0.0.1";
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const char *commandline = "cat";
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const char *username = "user";
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const char *password = "password";
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unsigned long hostaddr;
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int sock;
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struct sockaddr_in sin;
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const char *fingerprint;
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LIBSSH2_SESSION *session;
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LIBSSH2_CHANNEL *channel;
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int rc;
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int exitcode;
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char *exitsignal=(char *)"none";
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size_t len;
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LIBSSH2_KNOWNHOSTS *nh;
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int type;
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#ifdef WIN32
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WSADATA wsadata;
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WSAStartup(MAKEWORD(2,0), &wsadata);
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#endif
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if (argc > 1)
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/* must be ip address only */
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hostname = argv[1];
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if (argc > 2) {
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username = argv[2];
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}
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if (argc > 3) {
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password = argv[3];
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}
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rc = libssh2_init (0);
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if (rc != 0) {
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fprintf (stderr, "libssh2 initialization failed (%d)\n", rc);
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return 1;
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}
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hostaddr = inet_addr(hostname);
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/* Ultra basic "connect to port 22 on localhost"
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* Your code is responsible for creating the socket establishing the
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* connection
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*/
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sock = socket(AF_INET, SOCK_STREAM, 0);
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sin.sin_family = AF_INET;
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sin.sin_port = htons(22);
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sin.sin_addr.s_addr = hostaddr;
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if (connect(sock, (struct sockaddr*)(&sin),
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sizeof(struct sockaddr_in)) != 0) {
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fprintf(stderr, "failed to connect!\n");
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return -1;
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}
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/* Create a session instance */
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session = libssh2_session_init();
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if (!session)
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return -1;
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/* tell libssh2 we want it all done non-blocking */
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libssh2_session_set_blocking(session, 0);
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/* ... start it up. This will trade welcome banners, exchange keys,
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* and setup crypto, compression, and MAC layers
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*/
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while ((rc = libssh2_session_startup(session, sock)) ==
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LIBSSH2_ERROR_EAGAIN);
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if (rc) {
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fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
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return -1;
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}
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nh = libssh2_knownhost_init(session);
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if(!nh) {
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/* eeek, do cleanup here */
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return 2;
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}
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/* read all hosts from here */
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libssh2_knownhost_readfile(nh, "known_hosts",
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LIBSSH2_KNOWNHOST_FILE_OPENSSH);
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/* store all known hosts to here */
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libssh2_knownhost_writefile(nh, "dumpfile",
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LIBSSH2_KNOWNHOST_FILE_OPENSSH);
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fingerprint = libssh2_session_hostkey(session, &len, &type);
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if(fingerprint) {
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struct libssh2_knownhost *host;
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int check = libssh2_knownhost_checkp(nh, hostname, 22,
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fingerprint, len,
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LIBSSH2_KNOWNHOST_TYPE_PLAIN|
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LIBSSH2_KNOWNHOST_KEYENC_RAW,
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&host);
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fprintf(stderr, "Host check: %d, key: %s\n", check,
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(check <= LIBSSH2_KNOWNHOST_CHECK_MISMATCH)?
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host->key:"<none>");
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/*****
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* At this point, we could verify that 'check' tells us the key is
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* fine or bail out.
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*****/
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}
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else {
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/* eeek, do cleanup here */
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return 3;
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}
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libssh2_knownhost_free(nh);
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if ( strlen(password) != 0 ) {
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/* We could authenticate via password */
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while ((rc = libssh2_userauth_password(session, username, password)) ==
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LIBSSH2_ERROR_EAGAIN);
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if (rc) {
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fprintf(stderr, "Authentication by password failed.\n");
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exit(1);
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}
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}
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libssh2_trace(session, LIBSSH2_TRACE_SOCKET);
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/* Exec non-blocking on the remove host */
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while( (channel = libssh2_channel_open_session(session)) == NULL &&
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libssh2_session_last_error(session,NULL,NULL,0) ==
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LIBSSH2_ERROR_EAGAIN ) {
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waitsocket(sock, session);
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}
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if( channel == NULL ) {
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fprintf(stderr,"Error\n");
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exit( 1 );
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}
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while( (rc = libssh2_channel_exec(channel, commandline)) ==
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LIBSSH2_ERROR_EAGAIN )
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waitsocket(sock, session);
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if( rc != 0 ) {
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fprintf(stderr, "exec error\n");
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exit( 1 );
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}
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else {
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LIBSSH2_POLLFD *fds = NULL;
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int running = 1;
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int bufsize = BUFSIZE;
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char buffer[BUFSIZE];
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int totsize = 1500000;
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int totwritten = 0;
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int totread = 0;
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int partials = 0;
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int rereads = 0;
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int rewrites = 0;
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int i;
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for (i = 0; i < BUFSIZE; i++)
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buffer[i] = 'A';
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if ((fds = malloc (sizeof (LIBSSH2_POLLFD))) == NULL) {
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fprintf(stderr, "malloc failed\n");
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exit(1);
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}
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fds[0].type = LIBSSH2_POLLFD_CHANNEL;
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fds[0].fd.channel = channel;
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fds[0].events = LIBSSH2_POLLFD_POLLIN | LIBSSH2_POLLFD_POLLOUT;
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do {
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int rc = (libssh2_poll(fds, 1, 10));
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int act = 0;
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if (rc < 1)
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continue;
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if (fds[0].revents & LIBSSH2_POLLFD_POLLIN) {
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int n = libssh2_channel_read(channel, buffer, sizeof(buffer));
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act++;
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if (n == LIBSSH2_ERROR_EAGAIN) {
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rereads++;
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fprintf(stderr, "will read again\n");
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}
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else if (n < 0) {
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fprintf(stderr, "read failed\n");
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exit(1);
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}
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else {
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totread += n;
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fprintf(stderr, "read %d bytes (%d in total)\n",
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n, totread);
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}
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}
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if (fds[0].revents & LIBSSH2_POLLFD_POLLOUT) {
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act++;
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if (totwritten < totsize) {
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/* we have not written all data yet */
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int left = totsize - totwritten;
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int size = (left < bufsize) ? left : bufsize;
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int n = libssh2_channel_write_ex(channel, 0, buffer, size);
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if (n == LIBSSH2_ERROR_EAGAIN) {
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rewrites++;
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fprintf(stderr, "will write again\n");
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}
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else if (n < 0) {
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fprintf(stderr, "write failed\n");
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exit(1);
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}
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else {
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totwritten += n;
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fprintf(stderr, "wrote %d bytes (%d in total)",
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n, totwritten);
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if (left >= bufsize && n != bufsize) {
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partials++;
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fprintf(stderr, " PARTIAL");
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}
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fprintf(stderr, "\n");
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}
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} else {
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/* all data written, send EOF */
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rc = libssh2_channel_send_eof(channel);
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if (rc == LIBSSH2_ERROR_EAGAIN) {
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fprintf(stderr, "will send eof again\n");
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}
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else if (rc < 0) {
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fprintf(stderr, "send eof failed\n");
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exit(1);
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}
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else {
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fprintf(stderr, "sent eof\n");
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/* we're done writing, stop listening for OUT events */
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fds[0].events &= ~LIBSSH2_POLLFD_POLLOUT;
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}
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}
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}
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if (fds[0].revents & LIBSSH2_POLLFD_CHANNEL_CLOSED) {
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if (!act) /* don't leave loop until we have read all data */
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running = 0;
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}
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} while(running);
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exitcode = 127;
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while( (rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN )
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waitsocket(sock, session);
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if( rc == 0 ) {
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exitcode = libssh2_channel_get_exit_status( channel );
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libssh2_channel_get_exit_signal(channel, &exitsignal,
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NULL, NULL, NULL, NULL, NULL);
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}
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if (exitsignal)
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printf("\nGot signal: %s\n", exitsignal);
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libssh2_channel_free(channel);
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channel = NULL;
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fprintf(stderr, "\nrereads: %d rewrites: %d totwritten %d\n",
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rereads, rewrites, totwritten);
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if (totwritten != totread) {
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fprintf(stderr, "\n*** FAIL bytes written: %d bytes "
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"read: %d ***\n", totwritten, totread);
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exit(1);
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}
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}
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libssh2_session_disconnect(session,
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"Normal Shutdown, Thank you for playing");
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libssh2_session_free(session);
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#ifdef WIN32
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closesocket(sock);
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#else
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close(sock);
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#endif
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fprintf(stderr, "all done\n");
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libssh2_exit();
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return 0;
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}
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