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POlibssh + iPhone Implementation with multiple commands execution in sequence
 

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    <p>It seems my questions are strange and i'm not getting enough help but I'm back. I've another strange question which needs to be solved in emergency.</p> <p>I'm developing an iPhone app. which uses <strong>libssh 2</strong> for commands execution through iPhone over remote host. It's okay and working all methods and commands if i execute them in single.</p> <p>My problem is, consider a sequence of commands,</p> <blockquote> <p><strong>pwd</strong></p> <p>=> o/p will be /Users/mac01</p> <p><strong>cd xyz</strong></p> <p>=> nothing as o/p</p> <p><strong>pwd</strong></p> <p>=> o/p will be /Users/mac01/xyz</p> </blockquote> <p>So, my question is to save the last state of the command which has been executed... but what I'm getting as o/p is <strong>/Users/mac01</strong> after second pwd command execution, which is wrong.</p> <p>So, could anyone help me out with such type of problems..? Thanks in advance. I'm using libssh 2.0 library.</p> <p><strong>The method executing command:</strong></p> <p>char* cmd_exec(const char *commandline, const char *host, const char *username, const char *password, int port){ int sock, rc, bytecount = 0; char *cmd_contents;</p> <pre><code>if(!he) { struct sockaddr_in sin; </code></pre> <h1>ifdef WIN32</h1> <pre><code> WSADATA wsadata; WSAStartup(MAKEWORD(2,0), &amp;wsadata); </code></pre> <h1>endif</h1> <pre><code> /* Init and Make Socket Connection */ /* Start Socket Connection */ sock = socket(AF_INET, SOCK_STREAM, 0); </code></pre> <h1>ifndef WIN32</h1> <pre><code> fcntl(sock, F_SETFL, 0); </code></pre> <h1>endif</h1> <pre><code> sin.sin_family = AF_INET; sin.sin_port = htons(port); /*sin.sin_addr.s_addr = inet_addr(host); if (connect(sock, (struct sockaddr*)(&amp;sin), sizeof(struct sockaddr_in)) != 0) { // in case connection failure fprintf(stderr, "Internet connection is required!\n"); return "NETWORKFAILURE"; }*/ //const char *c = getIPFromHost("pepsi"); //sin.sin_addr.s_addr = inet_addr(c); /* IP Address Calculation */ he = gethostbyname(host); if(!he) return "Invalid hostname"; struct in_addr **addr_list; addr_list = (struct in_addr **)he-&gt;h_addr_list; //for(int i = 0; addr_list[i] != NULL; i++) { if(addr_list != NULL){ sin.sin_addr.s_addr = inet_addr(inet_ntoa(*addr_list[0])); //printf("%s", inet_ntoa(*addr_list[0])); if (connect(sock, (struct sockaddr*)(&amp;sin), sizeof(struct sockaddr_in)) != 0) { // in case connection failure fprintf(stderr, "Internet connection is required!\n"); return "NETWORKFAILURE"; } } } /* End Socket Connection */ // Initialize and create Session Instance if(!session) { session = libssh2_session_init(); if ( !session ) { fprintf( stderr, "Error initializing SSH session\n" ); return "SESSIONFAILURE"; } /* Since we have set non-blocking, tell libssh2 we are non-blocking */ //libssh2_session_set_blocking(session, 0); // Session starting if (libssh2_session_startup(session, sock)) { fprintf(stderr, "Failure establishing SSH session\n"); return "SESSIONFAILURE"; } /* Authenticate via password */ if(strlen(password) != 0){ if ( libssh2_userauth_password( session, username, password ) ) { fprintf( stderr, "Unable to authenticate user [%s]" "(wrong password specified?)\n", username ); return "AUTHENTICATIONFAILURE"; } }else{ 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"); return "AUTHENTICATIONFAILURE"; } } //libssh2_session_set_blocking(session, 1); } // Open a session channel for command execution if(!channel) { channel = libssh2_channel_open_session(session); if (!channel) { fprintf(stderr, "Unable to open a session\n"); return "SESSIONFAILURE"; } // Execute a command through channel while( (rc = libssh2_channel_shell(channel)) == //while( (rc = libssh2_channel_exec(channel, commandline)) == LIBSSH2_ERROR_EAGAIN ) { waitsocket(sock, session); } if( rc != 0 ) // if command execution failed { fprintf(stderr,"Error\n"); return "CMDFAILURE"; } } //libssh2_channel_write(channel,commandline,strlen(commandline)); do { /* write the same data over and over, until error or completion */ rc = libssh2_channel_write(channel, commandline, sizeof(commandline)); if (rc &lt; 0) { fprintf(stderr, "ERROR %d\n", rc); } } while (rc == 0); while (libssh2_channel_send_eof(channel) == LIBSSH2_ERROR_EAGAIN); /* read channel output */ /* Start channel read */ for( ;; ) { /* loop until we block */ int rc; do { char buffer[0x4000]; // char *tcontents = (char*)malloc(sizeof(buffer) + sizeof(cmd_contents)); rc = libssh2_channel_read( channel, buffer, sizeof(buffer) ); if( rc &gt; 0 ) { int i; bytecount += rc; for( i=0; i &lt; rc; ++i ) fputc( buffer[i], stderr); if(cmd_contents){ free(cmd_contents); } cmd_contents = (char*)malloc(sizeof(buffer) + sizeof(cmd_contents)); strcpy(cmd_contents, buffer); fprintf(stderr, "\n"); } else { //fprintf(stderr, "libssh2_channel_read returned %d\n", rc); } } while( rc &gt; 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; } /* End channel read */ while( (rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN ); /* closing channel */ int exitcode = 127; </code></pre> <p>// while( (rc = libssh2_channel_close(channel)) == LIBSSH2_ERROR_EAGAIN ); if( rc == 0 ) { exitcode = libssh2_channel_get_exit_status( channel ); } //<br> libssh2_channel_free(channel); // freeup memory channel = NULL;</p> <pre><code>/* libssh2_session_disconnect( session, "" ); // closing session libssh2_session_free( session ); // free up memory close( sock ); // closing socket */ return cmd_contents; </code></pre> <p>}</p>
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