| /* |
| * $Id: ssh2_exec.c,v 1.4 2009/05/07 20:30:22 bagder Exp $ |
| * |
| * Sample showing how to use libssh2 to execute a command remotely. |
| * |
| * The sample code has fixed values for host name, user name, password |
| * and command to run. |
| * |
| * Run it like this: |
| * |
| * $ ./ssh2_exec 127.0.0.1 user password "uptime" |
| * |
| */ |
| |
| #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 |
| |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <stdlib.h> |
| #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; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| const char *hostname = "127.0.0.1"; |
| const char *commandline = "uptime"; |
| 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; |
| int bytecount = 0; |
| size_t len; |
| LIBSSH2_KNOWNHOSTS *nh; |
| int type; |
| |
| #ifdef WIN32 |
| WSADATA wsadata; |
| WSAStartup(MAKEWORD(2,0), &wsadata); |
| #endif |
| if (argc > 1) |
| /* must be ip address only */ |
| hostname = argv[1]; |
| |
| if (argc > 2) { |
| username = argv[2]; |
| } |
| if (argc > 3) { |
| password = argv[3]; |
| } |
| if (argc > 4) { |
| commandline = argv[4]; |
| } |
| |
| 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_startup(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_check(nh, (char *)hostname, |
| (char *)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"); |
| goto shutdown; |
| } |
| } |
| else { |
| /* Or by public key */ |
| while ((rc = libssh2_userauth_publickey_fromfile(session, username, |
| "/home/user/" |
| ".ssh/id_rsa.pub", |
| "/home/user/" |
| ".ssh/id_rsa", |
| password)) == |
| LIBSSH2_ERROR_EAGAIN); |
| if (rc) { |
| fprintf(stderr, "\tAuthentication by public key failed\n"); |
| goto shutdown; |
| } |
| } |
| |
| #if 0 |
| libssh2_trace(session, ~0 ); |
| #endif |
| |
| /* 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,"Error\n"); |
| exit( 1 ); |
| } |
| for( ;; ) |
| { |
| /* loop until we block */ |
| int rc; |
| do |
| { |
| char buffer[0x4000]; |
| rc = libssh2_channel_read( channel, buffer, sizeof(buffer) ); |
| if( rc > 0 ) |
| { |
| int i; |
| bytecount += rc; |
| fprintf(stderr, "We read:\n"); |
| for( i=0; i < rc; ++i ) |
| fputc( buffer[i], stderr); |
| fprintf(stderr, "\n"); |
| } |
| else { |
| fprintf(stderr, "libssh2_channel_read returned %d\n", rc); |
| } |
| } |
| while( rc > 0 ); |
| |
| /* this is due to blocking that would occur otherwise so we loop on |
| this condition */ |
| if( rc == LIBSSH2_ERROR_EAGAIN ) |
| { |
| waitsocket(sock, session); |
| } |
| else |
| break; |
| } |
| exitcode = 127; |
| while( (rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN ) |
| waitsocket(sock, session); |
| |
| if( rc == 0 ) |
| { |
| exitcode = libssh2_channel_get_exit_status( channel ); |
| } |
| printf("\nEXIT: %d bytecount: %d\n", exitcode, bytecount); |
| |
| libssh2_channel_free(channel); |
| channel = NULL; |
| |
| shutdown: |
| |
| 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"); |
| return 0; |
| } |
| |