Make sftp_nonblock.c a non-blocking version of sftp.c, just like sftpdir.c
This commit is contained in:
James Housley
parent
08fd7e259b
commit
3bd3eb35b3
@ -1,7 +1,7 @@
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AUTOMAKE_OPTIONS = foreign nostdinc
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# samples
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noinst_PROGRAMS = ssh2 scp_nonblock sftp_nonblock sftp scp sftpdir sftpdir_nonblock
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noinst_PROGRAMS = ssh2 scp_nonblock sftp_nonblock sftp sftp_RW_nonblock scp sftpdir sftpdir_nonblock
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INCLUDES = -I$(top_srcdir)/include
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LDADD = $(top_builddir)/src/libssh2.la
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@ -16,6 +16,8 @@ scp_nonblock_SOURCES = scp_nonblock.c
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sftp_nonblock_SOURCES = sftp_nonblock.c
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sftp_RW_nonblock_SOURCES = sftp_RW_nonblock.c
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sftpdir_nonblock_SOURCES = sftpdir_nonblock.c
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scp_SOURCES = scp.c
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@ -1,12 +1,12 @@
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/*
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* $Id: sftp_nonblock.c,v 1.1 2007/02/02 16:21:20 bagder Exp $
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* $Id: sftp_nonblock.c,v 1.2 2007/04/22 14:16:26 jehousley Exp $
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*
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* Sample showing how to do SFTP transfers in a non-blocking manner.
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* Sample showing how to do SFTP transfers.
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*
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* It will first download a given source file, store it locally and then
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* upload the file again to a given destination file.
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* The sample code has default values for host name, user name, password
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* and path to copy, but you can specify them on the command line like:
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*
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* Using the SFTP server running on 127.0.0.1
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* "sftp 192.168.0.1 user password /tmp/secrets"
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*/
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#include <libssh2.h>
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@ -16,266 +16,172 @@
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# include <netinet/in.h>
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# include <sys/socket.h>
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# include <unistd.h>
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# include <arpa/inet.h>
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#else
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# include <winsock2.h>
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#endif
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#include <sys/types.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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#define STORAGE "/tmp/sftp-storage" /* this is the local file name this
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example uses to store the downloaded
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file in */
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int main(int argc, char *argv[])
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{
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int sock, i, auth_pw = 1;
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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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char *username=(char *)"username";
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char *password=(char *)"password";
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char *sftppath=(char *)"/tmp/TEST"; /* source path */
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char *dest=(char *)"/tmp/TEST2"; /* destination path */
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int rc;
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LIBSSH2_SFTP *sftp_session;
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LIBSSH2_SFTP_HANDLE *sftp_handle;
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FILE *tempstorage;
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char mem[1000];
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struct timeval timeout;
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fd_set fd;
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unsigned long hostaddr;
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int sock, i, auth_pw = 1;
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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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char *username=(char *)"username";
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char *password=(char *)"password";
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char *sftppath=(char *)"/tmp/TEST";
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int rc;
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LIBSSH2_SFTP *sftp_session;
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LIBSSH2_SFTP_HANDLE *sftp_handle;
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#ifdef WIN32
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WSADATA wsadata;
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WSADATA wsadata;
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WSAStartup(WINSOCK_VERSION, &wsadata);
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WSAStartup(WINSOCK_VERSION, &wsadata);
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#endif
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/* Ultra basic "connect to port 22 on localhost"
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* The application is responsible for creating the socket establishing
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* the connection
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*/
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (argc > 1) {
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hostaddr = inet_addr(argv[1]);
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} else {
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hostaddr = htonl(0x7F000001);
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}
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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 = htonl(0x7F000001);
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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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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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if(argc > 4) {
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sftppath = argv[4];
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}
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/*
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* The application code is responsible for creating the socket
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* and establishing the connection
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*/
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sock = socket(AF_INET, SOCK_STREAM, 0);
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/* We set the socket non-blocking. We do it after the connect just to
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simplify the example code. */
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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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/* We set the socket non-blocking. We do it after the connect just to
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simplify the example code. */
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#ifdef F_SETFL
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/* FIXME: this can/should be done in a more portable manner */
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rc = fcntl(sock, F_GETFL, 0);
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fcntl(sock, F_SETFL, rc | O_NONBLOCK);
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/* FIXME: this can/should be done in a more portable manner */
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rc = fcntl(sock, F_GETFL, 0);
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fcntl(sock, F_SETFL, rc | O_NONBLOCK);
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#else
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#error "add support for setting the socket non-blocking here"
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#endif
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/* Create a session instance
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*/
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session = libssh2_session_init();
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if(!session)
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return -1;
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/* Create a session instance
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*/
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session = libssh2_session_init();
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if(!session)
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return -1;
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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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rc = libssh2_session_startup(session, sock);
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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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/* ... 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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rc = libssh2_session_startup(session, sock);
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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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/* At this point we havn't yet authenticated. The first thing to do
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* is check the hostkey's fingerprint against our known hosts Your app
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* may have it hard coded, may go to a file, may present it to the
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* user, that's your call
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*/
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fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_MD5);
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printf("Fingerprint: ");
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for(i = 0; i < 16; i++) {
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printf("%02X ", (unsigned char)fingerprint[i]);
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}
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printf("\n");
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if (auth_pw) {
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/* We could authenticate via password */
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if (libssh2_userauth_password(session, username, password)) {
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printf("Authentication by password failed.\n");
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goto shutdown;
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}
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} else {
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/* Or by public key */
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if (libssh2_userauth_publickey_fromfile(session, username,
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"/home/username/.ssh/id_rsa.pub",
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"/home/username/.ssh/id_rsa",
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password)) {
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printf("\tAuthentication by public key failed\n");
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goto shutdown;
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}
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}
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fprintf(stderr, "libssh2_sftp_init()!\n");
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sftp_session = libssh2_sftp_init(session);
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if (!sftp_session) {
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fprintf(stderr, "Unable to init SFTP session\n");
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goto shutdown;
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}
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/* Since we have set non-blocking, tell libssh2 we are non-blocking */
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libssh2_sftp_set_blocking(sftp_session, 0);
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fprintf(stderr, "libssh2_sftp_open()!\n");
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/* Request a file via SFTP */
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sftp_handle =
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libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
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if (!sftp_handle) {
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fprintf(stderr, "Unable to open file with SFTP\n");
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goto shutdown;
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}
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fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
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do {
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char mem[1024];
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/* loop until we fail */
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fprintf(stderr, "libssh2_sftp_read()!\n");
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rc = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));
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if (rc > 0) {
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write(2, mem, rc);
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} else {
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break;
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}
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} while (1);
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/* At this point we havn't yet authenticated. The first thing to do
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* is check the hostkey's fingerprint against our known hosts Your app
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* may have it hard coded, may go to a file, may present it to the
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* user, that's your call
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*/
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fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_MD5);
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printf("Fingerprint: ");
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for(i = 0; i < 16; i++) {
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printf("%02X ", (unsigned char)fingerprint[i]);
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}
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printf("\n");
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if(argc > 1) {
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username = argv[1];
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}
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if(argc > 2) {
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password = argv[2];
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}
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if(argc > 3) {
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sftppath = argv[3];
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}
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if(argc > 4) {
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dest = argv[4];
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}
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tempstorage = fopen(STORAGE, "wb");
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if(!tempstorage) {
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printf("Can't open temp storage file %s\n", STORAGE);
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goto shutdown;
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}
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if (auth_pw) {
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/* We could authenticate via password */
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if (libssh2_userauth_password(session, username, password)) {
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printf("Authentication by password failed.\n");
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goto shutdown;
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}
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} else {
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/* Or by public key */
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if (libssh2_userauth_publickey_fromfile(session, username,
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"/home/username/.ssh/id_rsa.pub",
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"/home/username/.ssh/id_rsa",
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password)) {
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printf("\tAuthentication by public key failed\n");
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goto shutdown;
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}
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}
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sftp_session = libssh2_sftp_init(session);
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if (!sftp_session) {
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fprintf(stderr, "Unable to init SFTP session\n");
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goto shutdown;
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}
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/* Request a file via SFTP */
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sftp_handle =
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libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
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if (!sftp_handle) {
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fprintf(stderr, "Unable to open file with SFTP\n");
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goto shutdown;
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}
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fprintf(stderr, "libssh2_sftp_open() is done, now receive data!\n");
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do {
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do {
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/* read in a loop until we block */
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rc = libssh2_sftp_readnb(sftp_handle, mem,
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sizeof(mem));
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fprintf(stderr, "libssh2_sftp_read returned %d\n",
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rc);
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if(rc > 0) {
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/* write to stderr */
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write(2, mem, rc);
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/* write to temporary storage area */
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fwrite(mem, rc, 1, tempstorage);
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}
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} while (rc > 0);
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if(rc != LIBSSH2SFTP_EAGAIN) {
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/* error or end of file */
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break;
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}
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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(sock, &fd);
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/* wait for readable or writeable */
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rc = select(sock+1, &fd, &fd, NULL, &timeout);
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if(rc <= 0) {
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/* negative is error
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0 is timeout */
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fprintf(stderr, "SFTP download timed out: %d\n", rc);
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break;
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}
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} while (1);
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libssh2_sftp_close(sftp_handle);
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fclose(tempstorage);
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tempstorage = fopen(STORAGE, "rb");
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if(!tempstorage) {
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/* weird, we can't read the file we just wrote to... */
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fprintf(stderr, "can't open %s for reading\n", STORAGE);
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goto shutdown;
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}
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/* we're done downloading, now reverse the process and upload the
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temporarily stored data to the destination path */
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sftp_handle =
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libssh2_sftp_open(sftp_session, dest,
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LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT,
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LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|
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LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);
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if(sftp_handle) {
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size_t nread;
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char *ptr;
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do {
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nread = fread(mem, 1, sizeof(mem), tempstorage);
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if(nread <= 0) {
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/* end of file */
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break;
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}
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ptr = mem;
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do {
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/* write data in a loop until we block */
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rc = libssh2_sftp_writenb(sftp_handle, ptr,
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nread);
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ptr += rc;
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nread -= nread;
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} while (rc > 0);
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if(rc != LIBSSH2SFTP_EAGAIN) {
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/* error or end of file */
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break;
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}
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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(sock, &fd);
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/* wait for readable or writeable */
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rc = select(sock+1, &fd, &fd, NULL, &timeout);
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if(rc <= 0) {
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/* negative is error
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0 is timeout */
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fprintf(stderr, "SFTP upload timed out: %d\n",
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rc);
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break;
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}
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} while (1);
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fprintf(stderr, "SFTP upload done!\n");
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}
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else {
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fprintf(stderr, "SFTP failed to open destination path: %s\n",
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dest);
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}
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libssh2_sftp_shutdown(sftp_session);
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libssh2_sftp_close(sftp_handle);
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libssh2_sftp_shutdown(sftp_session);
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shutdown:
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libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
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libssh2_session_free(session);
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libssh2_session_disconnect(session, "Normal Shutdown, Thank you for playing");
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libssh2_session_free(session);
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#ifdef WIN32
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Sleep(1000);
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closesocket(sock);
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Sleep(1000);
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closesocket(sock);
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#else
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sleep(1);
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close(sock);
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sleep(1);
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close(sock);
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#endif
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printf("all done\n");
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return 0;
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return 0;
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}
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Block a user