说明：首先包含下面的头文件至项目中，头文件中只提供了上传单个文件到指定ftp目录的功能
测试环境: ubuntu 18.04，vsftpd 请大家检查是否打开了允许创建文件夹的权限
static inline int ftp_socket_send(int fd, char *str)
{
send(fd, str, strlen(str), 0);
return 0;
}
static inline int ftp_socket_recv(int fd, char *str)
{
int size;
size = recv(fd, str, MAX_LEN-1, 0);
str[size] = 0;
//printf("ftp recv: %s\n",str);
return 0;
}
static int ftp_get_data_port(char *buff, in_port_t *port)
{
int i = 0, j = 0;
short port_l = 0, port_h = 0;
if (buff == NULL || port == NULL)
{
return -1;
}
// (192,168,186,1,4,0).
while (buff[i++] != '(');
while (j < 4)
{
if(buff[i++] == ',')
j++;
}
while (buff[i] != ',')
{
port_h *= 10;
port_h += buff[i] - 0x30;
i++;
}
i++;
while (buff[i] != ')')
{
port_l *= 10;
port_l += buff[i] - 0x30;
i++;
}
printf("data_port : %u\n", port_h << 8 | port_l);
*port = htons((short)(port_h << 8 | port_l));
return 0;
}
static int ftp_get_upload_file_name(const char *upload_file, char *file_name)
{
int i = 0;
int path_lenth = 0;
if (upload_file == NULL || file_name == NULL)
{
return -1;
}
path_lenth = strlen(upload_file);
while (path_lenth - i > 0)
{
// find index of '/'
if (upload_file[path_lenth - i]== 47)
{
i--;
break;
}
i++;
}
strcpy(file_name, &upload_file[path_lenth - i]);
return 0;
}
int ftp_upload_file(const char *ip, unsigned int port, const char *user, const char *pwd,
const char *upload_file,const char *upload_name, const char *folder_name)
{
int ret;
int size;
char buff[MAX_LEN];
char cmd[MAX_CMD_LEN];
char file_name[256];
int fd_socket, fd_data;
struct sockaddr_in addr;
struct sockaddr_in data;
int send_ret=0;
addr.sin_family = AF_INET;
inet_aton(ip, &addr.sin_addr);
addr.sin_port = htons(port);
data.sin_family = AF_INET;
inet_aton(ip, &data.sin_addr);
//用于建立和ftp服务的连接，通过21端口
fd_socket = socket(AF_INET, SOCK_STREAM, 0);
if (fd_socket == -1) {
return -1;
}
fd_data = socket(AF_INET, SOCK_STREAM, 0);
if (fd_data == -1) {
close(fd_socket);
return -1;
}
ret = connect(fd_socket, (struct sockaddr *)&addr, sizeof(addr));
if (ret != 0) {
close(fd_data);
close(fd_socket);
printf("connet falied\n");
return -1;
}
size = recv(fd_socket, buff, MAX_LEN-1, 0);
buff[size] = 0;
//向ftp服务器发送登录使用的用户名
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "USER %s\r\n", user);
// ftp_socket_send(fd_socket, "PASS shikejun\r\n");
ftp_socket_send(fd_socket, cmd);
ftp_socket_recv(fd_socket, buff);
//向ftp服务器发送登录使用的密码
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "PASS %s\r\n", pwd);
ftp_socket_send(fd_socket, cmd);
ftp_socket_recv(fd_socket, buff);
//返回服务器使用的操作系统
ftp_socket_send(fd_socket, "SYST\r\n");
ftp_socket_recv(fd_socket, buff);
//指定数据类型，A=ASCII， E=EBCDIC， I=binary
ftp_socket_send(fd_socket, "TYPE I\r\n");
ftp_socket_recv(fd_socket, buff);
//用被动方式向ftp请求连接，ftp返回一个端口，用于上传文件
ftp_socket_send(fd_socket, "PASV\r\n");
ftp_socket_recv(fd_socket, buff);
ftp_get_data_port(buff, &data.sin_port);
memset(file_name, 0, sizeof(file_name));
if(upload_name==NULL||strlen(upload_name)<=1) {
ftp_get_upload_file_name(upload_file, file_name);
}
else {
strcpy(file_name,upload_name);
}
//进入ftp中的folder_name
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "CWD %s\r\n", folder_name);
ftp_socket_send(fd_socket, cmd);
ftp_socket_recv(fd_socket, buff);
char *cmp_res = "550 Failed to change directory.";
char buff_res[31];
for (int i=0; i<31; i++) {
buff_res[i] = buff[i];
}
//如果ftp中目前没有folder_name，则会返回一个550 Failed to change directory.
if (!strcmp(buff_res, cmp_res)) {
//如果不存在folder_name，则首先进行创建，然后在改变在ftp中工作目录为folder_name
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "MKD %s\r\n", folder_name);
ftp_socket_send(fd_socket, cmd);
ftp_socket_recv(fd_socket, buff);
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "CWD %s\r\n", folder_name);
ftp_socket_send(fd_socket, cmd);
ftp_socket_recv(fd_socket, buff);
}
//在ftp中建立文件，名为file_name
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "STOR %s\r\n", file_name);
ftp_socket_send(fd_socket, cmd);
//通过fd_data进行文件上传
ret = connect(fd_data, (struct sockaddr *)&data, sizeof(data));
if (ret != 0) {
printf("connet falied\n");
close(fd_data);
close(fd_socket);
return -1;
}
ftp_socket_recv(fd_socket, buff);
//打开本地文件
int fd = open(upload_file, O_RDONLY);
if (fd == -1) {
printf("open: \n");
close(fd_data);
close(fd_socket);
return -1;
}
//进行流的操作，read读取本地文件数据后再send到ftp中
while ((ret = read(fd, buff, sizeof(buff))) > 0) {
send_ret = send(fd_data, buff, ret, 0);
if(send_ret<=0) {
break;
}
//usleep(30*1000);
}
memset(cmd, 0, sizeof(cmd));
sprintf(cmd, "QUIT\r\n");
ftp_socket_send(fd_socket, cmd);
close(fd);
close(fd_data);
ftp_socket_recv(fd_socket, buff);
close(fd_socket);
printf("ftp_upload [%s] [%s] result: %s\n",upload_file,upload_name,buff);
return 0;
}
// FTPTOOL_H
首先包含上面的头文件 我这边叫做 ftptool.h
下面是使用的demo
const char * folder_name = resultForder.c_str(); //需要遍历的本地文件夹的名字
DIR * dir = opendir(folder_name);
int total=0;
if(!dir) {
perror("opendir");
return;
}
else {
struct dirent * ptr = NULL;
char npath[1024];
while ((ptr = readdir(dir))!=NULL) {
if (!strcmp(ptr->d_name,".")||!strcmp(ptr->d_name, "..")) {
continue;
}
//如果文件类型是普通文件，进行上传
if (ptr->d_type != DT_DIR) {
std::string file_name(folder_name);
file_name.append("/");
file_name.append(ptr->d_name);
//ftp(ftpIp, ftpPort, username, password, local_filename, ftpFilename, ftpFolder)
//前四个参数是ftp服务器的ip,端口,用户名和密码，第五个参数是上传的本地文件的绝对路径，第五个参数是把此文件上传至ftp服务器之后的名称，第六个是上传至ftp的哪个文件夹下
ftp_upload_file("127.0.0.1",21,"xgd","123456",file_name.c_str(), ptr->d_name,folder_name);
}
}
}
结语：我这里相当于是进行反复的操作去建立连接，虽然每次都有释放，但是还是比较蠢的方式，之前试过建立一次连接，然后把文件都传上去，但是发现那种写法把所有文件的内容都写到了一个文件里，我猜测应该是需要多次通过PASV方式去请求到进行数据传输的端口
