2007-02-02 17:21:20 +01:00
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/*
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2007-04-27 01:59:14 +02:00
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* $Id: scp_nonblock.c,v 1.3 2007/04/26 23:59:14 gknauf Exp $
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2007-02-02 17:21:20 +01:00
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*
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* Sample showing how to do SCP transfers in a non-blocking manner.
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*/
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#include <libssh2.h>
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2007-04-27 01:59:14 +02:00
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#include <libssh2_config.h>
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2007-02-02 17:21:20 +01:00
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2007-04-27 00:59:29 +02:00
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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_NETINET_IN_H
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2007-02-02 17:21:20 +01:00
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# include <netinet/in.h>
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2007-04-27 00:59:29 +02:00
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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2007-02-02 17:21:20 +01:00
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# include <sys/socket.h>
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2007-04-27 00:59:29 +02:00
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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_SYS_TIME_H
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# include <sys/time.h>
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2007-02-02 17:21:20 +01:00
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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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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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LIBSSH2_CHANNEL *channel;
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char *username=(char *)"username";
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char *password=(char *)"password";
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char *scppath=(char *)"/tmp/TEST";
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struct stat fileinfo;
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int rc;
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off_t got=0;
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#ifdef WIN32
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WSADATA 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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* 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 = 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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/* 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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#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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/* ... 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(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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scppath = argv[3];
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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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/* Request a file via SCP */
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channel = libssh2_scp_recv(session, scppath, &fileinfo);
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if (!channel) {
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fprintf(stderr, "Unable to open a session\n");
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goto shutdown;
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}
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fprintf(stderr, "libssh2_scp_recv() is done, now receive data!\n");
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while(got < fileinfo.st_size) {
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char mem[1000];
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struct timeval timeout;
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int rc;
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fd_set fd;
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do {
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int amount=sizeof(mem);
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if((fileinfo.st_size -got) < amount) {
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amount = fileinfo.st_size -got;
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}
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/* loop until we block */
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rc = libssh2_channel_readnb(channel, mem, amount);
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if(rc > 0) {
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write(2, mem, rc);
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got += rc;
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}
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} while (rc > 0);
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if(rc == LIBSSH2CHANNEL_EAGAIN) {
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/* this is due to blocking that would occur otherwise
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so we loop on this condition */
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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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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, "SCP timed out: %d\n", rc);
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}
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continue;
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}
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break;
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}
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libssh2_channel_free(channel);
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channel = NULL;
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shutdown:
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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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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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#endif
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printf("all done\n");
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return 0;
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}
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