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Annotation of embedaddon/curl/docs/examples/sftpget.c, revision 1.1

1.1     ! misho       1: /***************************************************************************
        !             2:  *                                  _   _ ____  _
        !             3:  *  Project                     ___| | | |  _ \| |
        !             4:  *                             / __| | | | |_) | |
        !             5:  *                            | (__| |_| |  _ <| |___
        !             6:  *                             \___|\___/|_| \_\_____|
        !             7:  *
        !             8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
        !             9:  *
        !            10:  * This software is licensed as described in the file COPYING, which
        !            11:  * you should have received as part of this distribution. The terms
        !            12:  * are also available at https://curl.haxx.se/docs/copyright.html.
        !            13:  *
        !            14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
        !            15:  * copies of the Software, and permit persons to whom the Software is
        !            16:  * furnished to do so, under the terms of the COPYING file.
        !            17:  *
        !            18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
        !            19:  * KIND, either express or implied.
        !            20:  *
        !            21:  ***************************************************************************/
        !            22: /* <DESC>
        !            23:  * Gets a file using an SFTP URL.
        !            24:  * </DESC>
        !            25:  */
        !            26: 
        !            27: #include <stdio.h>
        !            28: 
        !            29: #include <curl/curl.h>
        !            30: 
        !            31: /* define this to switch off the use of ssh-agent in this program */
        !            32: #undef DISABLE_SSH_AGENT
        !            33: 
        !            34: /*
        !            35:  * This is an example showing how to get a single file from an SFTP server.
        !            36:  * It delays the actual destination file creation until the first write
        !            37:  * callback so that it won't create an empty file in case the remote file
        !            38:  * doesn't exist or something else fails.
        !            39:  */
        !            40: 
        !            41: struct FtpFile {
        !            42:   const char *filename;
        !            43:   FILE *stream;
        !            44: };
        !            45: 
        !            46: static size_t my_fwrite(void *buffer, size_t size, size_t nmemb,
        !            47:                         void *stream)
        !            48: {
        !            49:   struct FtpFile *out = (struct FtpFile *)stream;
        !            50:   if(!out->stream) {
        !            51:     /* open file for writing */
        !            52:     out->stream = fopen(out->filename, "wb");
        !            53:     if(!out->stream)
        !            54:       return -1; /* failure, can't open file to write */
        !            55:   }
        !            56:   return fwrite(buffer, size, nmemb, out->stream);
        !            57: }
        !            58: 
        !            59: 
        !            60: int main(void)
        !            61: {
        !            62:   CURL *curl;
        !            63:   CURLcode res;
        !            64:   struct FtpFile ftpfile = {
        !            65:     "yourfile.bin", /* name to store the file as if successful */
        !            66:     NULL
        !            67:   };
        !            68: 
        !            69:   curl_global_init(CURL_GLOBAL_DEFAULT);
        !            70: 
        !            71:   curl = curl_easy_init();
        !            72:   if(curl) {
        !            73:     /*
        !            74:      * You better replace the URL with one that works!
        !            75:      */
        !            76:     curl_easy_setopt(curl, CURLOPT_URL,
        !            77:                      "sftp://user@server/home/user/file.txt");
        !            78:     /* Define our callback to get called when there's data to be written */
        !            79:     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
        !            80:     /* Set a pointer to our struct to pass to the callback */
        !            81:     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);
        !            82: 
        !            83: #ifndef DISABLE_SSH_AGENT
        !            84:     /* We activate ssh agent. For this to work you need
        !            85:        to have ssh-agent running (type set | grep SSH_AGENT to check) or
        !            86:        pageant on Windows (there is an icon in systray if so) */
        !            87:     curl_easy_setopt(curl, CURLOPT_SSH_AUTH_TYPES, CURLSSH_AUTH_AGENT);
        !            88: #endif
        !            89: 
        !            90:     /* Switch on full protocol/debug output */
        !            91:     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
        !            92: 
        !            93:     res = curl_easy_perform(curl);
        !            94: 
        !            95:     /* always cleanup */
        !            96:     curl_easy_cleanup(curl);
        !            97: 
        !            98:     if(CURLE_OK != res) {
        !            99:       /* we failed */
        !           100:       fprintf(stderr, "curl told us %d\n", res);
        !           101:     }
        !           102:   }
        !           103: 
        !           104:   if(ftpfile.stream)
        !           105:     fclose(ftpfile.stream); /* close the local file */
        !           106: 
        !           107:   curl_global_cleanup();
        !           108: 
        !           109:   return 0;
        !           110: }