Autenticar la descarga de libcurl FTP en C++

Question

Estoy intentando cargar un archivo usando libcurl pero parece que no está autenticando la conexión a mi servidor. He intentado usar el ftp://username:password@example.com/ pero fue en vano. Este es mi código:

#include <stdio.h> 
#include <string.h> 
#include <curl/curl.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#include <errno.h> 
#ifdef WIN32 
#include <io.h> 
#else 
#include <unistd.h> 
#endif 
#define LOCAL_FILE  "C:/myfile.txt" 
#define UPLOAD_FILE_AS "file.txt" 
#define REMOTE_URL  "ftp://example.com/" UPLOAD_FILE_AS 
#define RENAME_FILE_TO "file.txt" 
static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream) 
{ 
    curl_off_t nread; 
    size_t retcode = fread(ptr, size, nmemb, (FILE *) stream); 
    nread = (curl_off_t) retcode; 
    fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T " bytes from filen", nread); 
    return retcode; 
} 

int main(void) 
{ 
    CURL *curl; 
    CURLcode res; 
    FILE *hd_src; 
    struct stat file_info; 
    curl_off_t fsize; 
    struct curl_slist *headerlist = NULL; 
    static const char buf_1[] = "RNFR " UPLOAD_FILE_AS; 
    static const char buf_2[] = "RNTO " RENAME_FILE_TO; 

    if (stat(LOCAL_FILE, &file_info)) { 
    printf("Couldnt open '%s': %sn", LOCAL_FILE, strerror(errno)); 
    return 1; 
    } 
    fsize = (curl_off_t) file_info.st_size; 
    printf("Local file size: %" CURL_FORMAT_CURL_OFF_T " bytes.n", fsize); 
    hd_src = fopen(LOCAL_FILE, "rb"); 
    curl_global_init(CURL_GLOBAL_ALL); 
    curl = curl_easy_init(); 
    if (curl) { 
    headerlist = curl_slist_append(headerlist, buf_1); 
    headerlist = curl_slist_append(headerlist, buf_2); 
    curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback); 
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L); 
    curl_easy_setopt(curl, CURLOPT_URL, REMOTE_URL); 
    curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist); 
    curl_easy_setopt(curl, CURLOPT_READDATA, hd_src); 
    curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t) fsize); 

    res = curl_easy_perform(curl); 

    curl_slist_free_all(headerlist); 

    /* always cleanup */ 
    curl_easy_cleanup(curl); 
    } 
    fclose(hd_src);  /* close the local file */ 

    curl_global_cleanup(); 
    return 0; 
} 

Answer 1

usted tiene que pasar el nombre de usuario y contraseña requerida para libcurl. Esto se realiza mediante la opción CURLOPT_USERPWD, acaba de establecer la siguiente manera:

curl_easy_setopt(curl, CURLOPT_USERPWD, "username:password");