ssh2-python/libssh2/example/ssh2_echo.c at callbacks · ParallelSSH/ssh2-python · GitHub

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* Run it like this:

* $ ./ssh2_echo 127.0.0.1 user password

* The code sends a 'cat' command, and then writes a lot of data to it only to

* check that reading the returned data sums up to the same amount.

#include "libssh2_config.h"

#include <libssh2.h>

#ifdef HAVE_WINSOCK2_H

# include <winsock2.h>

#endif

#ifdef HAVE_SYS_SOCKET_H

# include <sys/socket.h>

#endif

#ifdef HAVE_NETINET_IN_H

# include <netinet/in.h>

#endif

#ifdef HAVE_SYS_SELECT_H

# include <sys/select.h>

#endif

# ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef HAVE_ARPA_INET_H

# include <arpa/inet.h>

#endif

#ifdef HAVE_SYS_TIME_H

#include <sys/time.h>

#endif

#include <sys/types.h>

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#include <fcntl.h>

#include <errno.h>

#include <stdio.h>

#include <ctype.h>

static int waitsocket(int socket_fd, LIBSSH2_SESSION *session)

{

struct timeval timeout;

int rc;

fd_set fd;

fd_set *writefd = NULL;

fd_set *readfd = NULL;

int dir;

timeout.tv_sec = 10;

timeout.tv_usec = 0;

FD_ZERO(&fd);

FD_SET(socket_fd, &fd);

/* now make sure we wait in the correct direction */

dir = libssh2_session_block_directions(session);

if(dir & LIBSSH2_SESSION_BLOCK_INBOUND)

readfd = &fd;

if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND)

writefd = &fd;

rc = select(socket_fd + 1, readfd, writefd, NULL, &timeout);

return rc;

}

#define BUFSIZE 32000

int main(int argc, char *argv[])

{

const char *hostname = "127.0.0.1";

const char *commandline = "cat";

const char *username = "user";

const char *password = "password";

unsigned long hostaddr;

int sock;

struct sockaddr_in sin;

const char *fingerprint;

LIBSSH2_SESSION *session;

LIBSSH2_CHANNEL *channel;

int rc;

int exitcode = 0;

char *exitsignal = (char *)"none";

size_t len;

LIBSSH2_KNOWNHOSTS *nh;

int type;

#ifdef WIN32

WSADATA wsadata;

int err;

err = WSAStartup(MAKEWORD(2, 0), &wsadata);

if(err != 0) {

fprintf(stderr, "WSAStartup failed with error: %d\n", err);

return 1;

}

#endif

if(argc > 1)

/* must be ip address only */

hostname = argv[1];

if(argc > 2) {

username = argv[2];

}

if(argc > 3) {

password = argv[3];

}

rc = libssh2_init(0);

if(rc != 0) {

fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);

return 1;

}

hostaddr = inet_addr(hostname);

/* Ultra basic "connect to port 22 on localhost"

* Your code is responsible for creating the socket establishing the

* connection

sock = socket(AF_INET, SOCK_STREAM, 0);

sin.sin_family = AF_INET;

sin.sin_port = htons(22);

sin.sin_addr.s_addr = hostaddr;

if(connect(sock, (struct sockaddr*)(&sin),

sizeof(struct sockaddr_in)) != 0) {

fprintf(stderr, "failed to connect!\n");

return -1;

}

/* Create a session instance */

session = libssh2_session_init();

if(!session)

return -1;

/* tell libssh2 we want it all done non-blocking */

libssh2_session_set_blocking(session, 0);

/* ... start it up. This will trade welcome banners, exchange keys,

* and setup crypto, compression, and MAC layers

while((rc = libssh2_session_handshake(session, sock)) ==

LIBSSH2_ERROR_EAGAIN);

if(rc) {

fprintf(stderr, "Failure establishing SSH session: %d\n", rc);

return -1;

}

nh = libssh2_knownhost_init(session);

if(!nh) {

/* eeek, do cleanup here */

return 2;

}

/* read all hosts from here */

libssh2_knownhost_readfile(nh, "known_hosts",

LIBSSH2_KNOWNHOST_FILE_OPENSSH);

/* store all known hosts to here */

libssh2_knownhost_writefile(nh, "dumpfile",

LIBSSH2_KNOWNHOST_FILE_OPENSSH);

fingerprint = libssh2_session_hostkey(session, &len, &type);

if(fingerprint) {

struct libssh2_knownhost *host;

int check = libssh2_knownhost_checkp(nh, hostname, 22,

fingerprint, len,

LIBSSH2_KNOWNHOST_TYPE_PLAIN|

LIBSSH2_KNOWNHOST_KEYENC_RAW,

&host);

fprintf(stderr, "Host check: %d, key: %s\n", check,

(check <= LIBSSH2_KNOWNHOST_CHECK_MISMATCH)?

host->key:"<none>");

/*****

* At this point, we could verify that 'check' tells us the key is

* fine or bail out.

*****/

}

else {

/* eeek, do cleanup here */

return 3;

}

libssh2_knownhost_free(nh);

if(strlen(password) != 0) {

/* We could authenticate via password */

while((rc = libssh2_userauth_password(session, username, password)) ==

LIBSSH2_ERROR_EAGAIN);

if(rc) {

fprintf(stderr, "Authentication by password failed.\n");

exit(1);

}

libssh2_trace(session, LIBSSH2_TRACE_SOCKET);

/* Exec non-blocking on the remove host */

while((channel = libssh2_channel_open_session(session)) == NULL &&

libssh2_session_last_error(session, NULL, NULL, 0) ==

LIBSSH2_ERROR_EAGAIN) {

waitsocket(sock, session);

}

if(channel == NULL) {

fprintf(stderr, "Error\n");

exit(1);

}

while((rc = libssh2_channel_exec(channel, commandline)) ==

LIBSSH2_ERROR_EAGAIN)

waitsocket(sock, session);

if(rc != 0) {

fprintf(stderr, "exec error\n");

exit(1);

}

else {

LIBSSH2_POLLFD *fds = NULL;

int running = 1;

int bufsize = BUFSIZE;

char buffer[BUFSIZE];

int totsize = 1500000;

int totwritten = 0;

int totread = 0;

int partials = 0;

int rereads = 0;

int rewrites = 0;

int i;

for(i = 0; i < BUFSIZE; i++)

buffer[i] = 'A';

fds = malloc(sizeof (LIBSSH2_POLLFD));

if(!fds) {

fprintf(stderr, "malloc failed\n");

exit(1);

}

fds[0].type = LIBSSH2_POLLFD_CHANNEL;

fds[0].fd.channel = channel;

fds[0].events = LIBSSH2_POLLFD_POLLIN | LIBSSH2_POLLFD_POLLOUT;

do {

int rc = (libssh2_poll(fds, 1, 10));

int act = 0;

if(rc < 1)

continue;

if(fds[0].revents & LIBSSH2_POLLFD_POLLIN) {

int n = libssh2_channel_read(channel, buffer, sizeof(buffer));

act++;

if(n == LIBSSH2_ERROR_EAGAIN) {

rereads++;

fprintf(stderr, "will read again\n");

}

else if(n < 0) {

fprintf(stderr, "read failed\n");

exit(1);

}

else {

totread += n;

fprintf(stderr, "read %d bytes (%d in total)\n",

n, totread);

}

if(fds[0].revents & LIBSSH2_POLLFD_POLLOUT) {

act++;

if(totwritten < totsize) {

/* we have not written all data yet */

int left = totsize - totwritten;

int size = (left < bufsize) ? left : bufsize;

int n = libssh2_channel_write_ex(channel, 0, buffer, size);

if(n == LIBSSH2_ERROR_EAGAIN) {

rewrites++;

fprintf(stderr, "will write again\n");

}

else if(n < 0) {

fprintf(stderr, "write failed\n");

exit(1);

}

else {

totwritten += n;

fprintf(stderr, "wrote %d bytes (%d in total)",

n, totwritten);

if(left >= bufsize && n != bufsize) {

partials++;

fprintf(stderr, " PARTIAL");

}

fprintf(stderr, "\n");

}

else {

/* all data written, send EOF */

rc = libssh2_channel_send_eof(channel);

if(rc == LIBSSH2_ERROR_EAGAIN) {

fprintf(stderr, "will send eof again\n");

}

else if(rc < 0) {

fprintf(stderr, "send eof failed\n");

exit(1);

}

else {

fprintf(stderr, "sent eof\n");

/* we're done writing, stop listening for OUT events */

fds[0].events &= ~LIBSSH2_POLLFD_POLLOUT;

}

if(fds[0].revents & LIBSSH2_POLLFD_CHANNEL_CLOSED) {

if(!act) /* don't leave loop until we have read all data */

running = 0;

}

} while(running);

exitcode = 127;

while((rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN)

waitsocket(sock, session);

if(rc == 0) {

exitcode = libssh2_channel_get_exit_status(channel);

libssh2_channel_get_exit_signal(channel, &exitsignal,

NULL, NULL, NULL, NULL, NULL);

}

if(exitsignal)

fprintf(stderr, "\nGot signal: %s\n", exitsignal);

libssh2_channel_free(channel);

channel = NULL;

fprintf(stderr, "\nrereads: %d rewrites: %d totwritten %d\n",

rereads, rewrites, totwritten);

if(totwritten != totread) {

fprintf(stderr, "\n*** FAIL bytes written: %d bytes "

"read: %d ***\n", totwritten, totread);

exit(1);

}

libssh2_session_disconnect(session,

"Normal Shutdown, Thank you for playing");

libssh2_session_free(session);

#ifdef WIN32

closesocket(sock);

#else

close(sock);

#endif

fprintf(stderr, "all done\n");

libssh2_exit();

return exitcode;

}

ssh2-python/libssh2/example/ssh2_echo.c at callbacks · ParallelSSH/ssh2-python · GitHub

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