使用libcurl庫，開發簡單的ftp上傳工具

#include <unistd.h>   
#include <stdlib.h>   
#include <stdio.h>   
#include <curl/curl.h>   
#include <string.h>   
  
int debugFun(CURL* curl, curl_infotype type, char* str, size_t len, void* stream)   
{   
    //只打印CURLINFO_TEXT類型的信息   
    if(type == CURLINFO_TEXT)   
    {   
        fwrite(str, 1, len, (FILE*)stream);   
    }   
}   
  
int main(int argc, char** argv)   
{   
    CURL* curl;   
    CURLcode res;   
    char errorBuf[CURL_ERROR_SIZE];   
    FILE *sendFile, *debugFile;   
    char ftpurl[256 + 1];   
    char usrpasswd[64 + 1];   
       
    curl_slist *slist=NULL;   
  
    if(argc != 7)   
    {   
        printf("Usage:\n\t./ftp ip username password ftpPath destFileName srcFile");   
        return -1;   
    }   
  
    //將相關的調試信息打印到dubugFile.txt中   
    if(NULL == (debugFile = fopen("debugFile.txt", "a+")))   
        return -1;   
  
    //打開ftp上傳的源文件   
    if(NULL == (sendFile = fopen(argv[6], "r")))   
    {   
        fclose(debugFile);   
        return -1;   
    }   
  
    //獲取需要發送文件的大小   
    fseek(sendFile, 0, SEEK_END);   
    int sendSize = ftell(sendFile);   
    if(sendSize < 0)   
    {   
        fclose(debugFile);   
        fclose(sendFile);   
        return -1;   
    }   
    fseek(sendFile, 0L, SEEK_SET);   
  
    if((res = curl_global_init(CURL_GLOBAL_ALL)) != 0)   
    {   
        fclose(debugFile);   
        fclose(sendFile);   
        return -1;   
    }   
    if((curl = curl_easy_init()) == NULL)   
    {   
        fclose(debugFile);   
        fclose(sendFile);   
        curl_global_cleanup();   
        return -1;   
    }   
  
    if(argv[4][strlen(argv[4]) - 1] != '/')   
        sprintf(ftpurl, "ftp://%s/%s/%s", argv[1], argv[4], argv[5]);   
    else  
        sprintf(ftpurl, "ftp://%s/%s%s", argv[1], argv[4], argv[5]);   
    curl_easy_setopt(curl, CURLOPT_URL, ftpurl);   
    //設置ftp上傳url,組成如下的URL   
    //ftp://192.168.31.145//root/subdir/curl/testftp.txt   
  
    sprintf(usrpasswd, "%s:%s", argv[2], argv[3]);   
    curl_easy_setopt(curl, CURLOPT_USERPWD, usrpasswd);   
  
    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);   
    curl_easy_setopt(curl, CURLOPT_DEBUGDATA, debugFile);   
       
    curl_easy_setopt(curl, CURLOPT_READDATA, sendFile);    
    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);   
    curl_easy_setopt(curl, CURLOPT_INFILESIZE, sendSize);   
    curl_easy_setopt(curl, CURLOPT_FTP_CREATE_MISSING_DIRS, 1);   
  
    curl_easy_setopt(curl, CURLOPT_DEBUGFUNCTION, debugFun);   
  
    res = curl_easy_perform(curl);   
    if(0 != res)   
    {   
        fclose(sendFile);   
        fclose(debugFile);   
        curl_easy_cleanup(curl);   
        curl_global_cleanup();   
        return -1;   
    }   
  
    curl_easy_cleanup(curl);   
    fclose(sendFile);   
    fclose(debugFile);     
    curl_global_cleanup();   
    return 0;      
}  

 

使用示範：

#./ftp 192.168.31.145 user passwd /root/wanghf/curl destFile srcFile

 

下面是debugFile.txt中的信息：

About to connect() to 192.168.31.145 port 21  
  Trying 192.168.31.145... connected   
Connected to 192.168.31.145 (192.168.31.145) port 21  
Entry path is '/root'  
Connect data stream passively   
disabling EPSV usage   
  Trying 192.168.31.145... connected   
Connecting to 192.168.31.145 (192.168.31.145) port 51581  
Remembering we are in dir /root/wanghf/curl/   
Connection #0 to host 192.168.31.145 left intact   
Closing connection #0 

 

剛剛開始學習libcurl庫，還有很多的細節不是很熟悉，這個示例很簡單，也沒有考慮到任何的異常，僅僅能夠實現功能，能將文件上傳到ftp服務器上，使用該例子，需要開啓ftp服務器。

 

文章來源於：http://www.iteye.com/topic/628630