使用libcurl库，开发简单的ftp上传工具

 

#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类型的信息
	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;
	}

	//将相关的调试信息打印到dubugFile.txt中
	if(NULL == (debugFile = fopen("debugFile.txt", "a+")))
		return -1;

	//打开ftp上传的源文件
	if(NULL == (sendFile = fopen(argv[6], "r")))
	{
		fclose(debugFile);
		return -1;
	}

	//获取需要发送文件的大小
	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);
	//设置ftp上传url,组成如下的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;	
}

 

 

使用示范：

#./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

 

 

刚刚开始学习libcurl库，还有很多的细节不是很熟悉，这个示例很简单，也没有考虑到任何的异常，仅仅能够实现功能，能将文件上传到ftp服务器上，使用该例子，需要开启ftp服务器。

jdk里面包括了FTP的操作sun.net.ftp.FtpClient

不如我自己写的库强