c语言实现ftp客户端，下载ftp的文件内容信息

由于工作需要，需要做一个从ftp服务器下载相关文件内容，保存本地

ftp.h


#ifndef TIANJING_FTP_H
#define TIANJING_FTP_H#include <stdio.h>//链接服务器
int ftp_connect( char *host, int port, char *user, char *pwd );
//断开服务器
int ftp_quit( int c_sock);
//设置表示类型
int ftp_type( int c_sock, char mode );
//改变工作目录
int ftp_cwd( int c_sock, char *path );
//回到上一层目录
int ftp_cdup( int c_sock );
//创建目录
int ftp_mkd( int c_sock, char *path );
//列表
int ftp_list( int c_sock, char *path, void **data, unsigned long long *data_len);
//下载文件
int ftp_retrfile( int c_sock, char *s, char *d ,unsigned long long *stor_size, int *stop);
//上传文件
int ftp_storfile( int c_sock, char *s, char *d ,unsigned long long *stor_size, int *stop);
//修改文件名&移动目录
int ftp_renamefile( int c_sock, char *s, char *d );
//删除文件
int ftp_deletefile( int c_sock, char *s );
//删除目录
int ftp_deletefolder( int c_sock, char *s );#define __PRINTF__ printf("\n--%s---%s----%s---%s--%d---\n",__FILE__,__DATE__,__TIME__,__FUNCTION__,__LINE__);#define __printf__ printf("\n--%s---%s----%s---%s--%d---\n",__FILE__,__DATE__,__TIME__,__FUNCTION__,__LINE__);#endif //TIANJING_FTP_H

ftp.c


#include "ftp.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>//创建一个socket并返回
int socket_connect(char *host,int port)
{struct sockaddr_in address;int s, opvalue;socklen_t slen;opvalue = 8;slen = sizeof(opvalue);memset(&address, 0, sizeof(address));if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0 ||setsockopt(s, IPPROTO_IP, IP_TOS, &opvalue, slen) < 0)return -1;//设置接收和发送超时struct timeval timeo = {15, 0};setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, &timeo, sizeof(timeo));setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeo, sizeof(timeo));address.sin_family = AF_INET;address.sin_port = htons((unsigned short)port);struct hostent* server = gethostbyname(host);if (!server)return -1;memcpy(&address.sin_addr.s_addr, server->h_addr, server->h_length);if (connect(s, (struct sockaddr*) &address, sizeof(address)) == -1)return -1;return s;
}
//连接到一个ftp的服务器，返回socket
int connect_server( char *host, int port )
{int       ctrl_sock;char      buf[512];int       result;ssize_t   len;ctrl_sock = socket_connect(host, port);if (ctrl_sock == -1) {return -1;}len = recv( ctrl_sock, buf, 512, 0 );buf[len] = 0;sscanf( buf, "%d", &result );if ( result != 220 ) {close( ctrl_sock );return -1;}return ctrl_sock;
}
//发送命令,返回结果
int ftp_sendcmd_re( int sock, char *cmd, void *re_buf, ssize_t *len)
{char        buf[512];ssize_t     r_len;if ( send( sock, cmd, strlen(cmd), 0 ) == -1 )return -1;r_len = recv( sock, buf, 512, 0 );if ( r_len < 1 ) return -1;buf[r_len] = 0;if (len != NULL) *len = r_len;if (re_buf != NULL) sprintf(re_buf, "%s", buf);return 0;
}
//发送命令,返回编号
int ftp_sendcmd( int sock, char *cmd )
{char     buf[512];int      result;ssize_t  len;result = ftp_sendcmd_re(sock, cmd, buf, &len);if (result == 0){sscanf( buf, "%d", &result );}return result;
}
//登录ftp服务器
int login_server( int sock, char *user, char *pwd )
{char    buf[128];int     result;sprintf( buf, "USER %s\r\n", user );result = ftp_sendcmd( sock, buf );if ( result == 230 ) return 0;else if ( result == 331 ) {sprintf( buf, "PASS %s\r\n", pwd );if ( ftp_sendcmd( sock, buf ) != 230 ) return -1;return 0;}elsereturn -1;
}
int create_datasock( int ctrl_sock )
{int     lsn_sock;int     port;int     len;struct sockaddr_in sin;char    cmd[128];lsn_sock = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP );if ( lsn_sock == -1 ) return -1;memset( (char *)&sin, 0, sizeof(sin) );sin.sin_family = AF_INET;if( bind(lsn_sock, (struct sockaddr *)&sin, sizeof(sin)) == -1 ) {close( lsn_sock );return -1;}if( listen(lsn_sock, 2) == -1 ) {close( lsn_sock );return -1;}len = sizeof( struct sockaddr );if ( getsockname( lsn_sock, (struct sockaddr *)&sin, (socklen_t *)&len ) == -1 ){close( lsn_sock );return -1;}port = sin.sin_port;if( getsockname( ctrl_sock, (struct sockaddr *)&sin, (socklen_t *)&len ) == -1 ){close( lsn_sock );return -1;}sprintf( cmd, "PORT %d,%d,%d,%d,%d,%d\r\n",sin.sin_addr.s_addr&0x000000FF,(sin.sin_addr.s_addr&0x0000FF00)>>8,(sin.sin_addr.s_addr&0x00FF0000)>>16,(sin.sin_addr.s_addr&0xFF000000)>>24,port>>8, port&0xff );if ( ftp_sendcmd( ctrl_sock, cmd ) != 200 ) {close( lsn_sock );return -1;}return lsn_sock;
}
//连接到PASV接口
int ftp_pasv_connect( int c_sock )
{int     r_sock;int     send_re;ssize_t len;int     addr[6];char    buf[512];char    re_buf[512];//设置PASV被动模式bzero(buf, sizeof(buf));sprintf( buf, "PASV\r\n");send_re = ftp_sendcmd_re( c_sock, buf, re_buf, &len);if (send_re == 0) {sscanf(re_buf, "%*[^(](%d,%d,%d,%d,%d,%d)",&addr[0],&addr[1],&addr[2],&addr[3],&addr[4],&addr[5]);}//连接PASV端口bzero(buf, sizeof(buf));sprintf( buf, "%d.%d.%d.%d",addr[0],addr[1],addr[2],addr[3]);r_sock = socket_connect(buf,addr[4]*256+addr[5]);return r_sock;
}
//表示类型
int ftp_type( int c_sock, char mode )
{char    buf[128];sprintf( buf, "TYPE %c\r\n", mode );if ( ftp_sendcmd( c_sock, buf ) != 200 )return -1;elsereturn 0;
}
//改变工作目录
int ftp_cwd( int c_sock, char *path )
{char    buf[128];int     re;sprintf( buf, "CWD %s\r\n", path );re = ftp_sendcmd( c_sock, buf );if ( re != 250 )return -1;elsereturn 0;
}
//回到上一层目录
int ftp_cdup( int c_sock )
{int     re;re = ftp_sendcmd( c_sock, "CDUP\r\n" );if ( re != 250 )return re;elsereturn 0;
}
//创建目录
int ftp_mkd( int c_sock, char *path )
{char    buf[512];int     re;sprintf( buf, "MKD %s\r\n", path );re = ftp_sendcmd( c_sock, buf );if ( re != 257 )return re;elsereturn 0;
}
//列表
int ftp_list( int c_sock, char *path, void **data, unsigned long long *data_len)
{int     d_sock;char    buf[512];int     send_re;int     result;ssize_t     len,buf_len,total_len;//连接到PASV接口d_sock = ftp_pasv_connect(c_sock);if (d_sock == -1) {return -1;}//发送LIST命令bzero(buf, sizeof(buf));sprintf( buf, "LIST %s\r\n", path);send_re = ftp_sendcmd( c_sock, buf );if (send_re >= 300 || send_re == 0)return send_re;len=total_len = 0;buf_len = 512;void *re_buf = malloc(buf_len);while ( (len = recv( d_sock, buf, 512, 0 )) > 0 ){if (total_len+len > buf_len){buf_len *= 2;void *re_buf_n = malloc(buf_len);memcpy(re_buf_n, re_buf, total_len);free(re_buf);re_buf = re_buf_n;}memcpy(re_buf+total_len, buf, len);total_len += len;}close( d_sock );//向服务器接收返回值bzero(buf, sizeof(buf));len = recv( c_sock, buf, 512, 0 );buf[len] = 0;sscanf( buf, "%d", &result );if ( result != 226 ){free(re_buf);return result;}*data = re_buf;*data_len = total_len;return 0;
}
//下载文件
int ftp_retrfile( int c_sock, char *s, char *d ,unsigned long long *stor_size, int *stop)
{int     d_sock;ssize_t     len,write_len;char    buf[512];int     handle;int     result;//打开本地文件handle = open( d,  O_WRONLY|O_CREAT|O_TRUNC, S_IREAD|S_IWRITE );if ( handle == -1 ) return -1;//设置传输模式ftp_type(c_sock, 'I');//连接到PASV接口d_sock = ftp_pasv_connect(c_sock);if (d_sock == -1){close(handle);return -1;}//发送STOR命令bzero(buf, sizeof(buf));sprintf( buf, "RETR %s\r\n", s );result = ftp_sendcmd( c_sock, buf );if (result >= 300 || result == 0){close(handle);return result;}//开始向PASV读取数据bzero(buf, sizeof(buf));while ( (len = recv( d_sock, buf, 512, 0 )) > 0 ) {write_len = write( handle, buf, len );if (write_len != len || (stop != NULL && *stop)){close( d_sock );close( handle );return -1;}if (stor_size != NULL){*stor_size += write_len;}}close( d_sock );close( handle );//向服务器接收返回值bzero(buf, sizeof(buf));len = recv( c_sock, buf, 512, 0 );buf[len] = 0;sscanf( buf, "%d", &result );if ( result >= 300 ) {return result;}return 0;
}
//上传文件
int ftp_storfile( int c_sock, char *s, char *d ,unsigned long long *stor_size, int *stop)
{int     d_sock;ssize_t     len,send_len;char    buf[512];int     handle;int send_re;int result;//打开本地文件handle = open( s,  O_RDONLY);if ( handle == -1 ) return -1;//设置传输模式ftp_type(c_sock, 'I');//连接到PASV接口d_sock = ftp_pasv_connect(c_sock);if (d_sock == -1){close(handle);return -1;}//发送STOR命令bzero(buf, sizeof(buf));sprintf( buf, "STOR %s\r\n", d );send_re = ftp_sendcmd( c_sock, buf );if (send_re >= 300 || send_re == 0){close(handle);return send_re;}//开始向PASV通道写数据bzero(buf, sizeof(buf));while ( (len = read( handle, buf, 512)) > 0){send_len = send(d_sock, buf, len, 0);if (send_len != len ||(stop != NULL && *stop)){close( d_sock );close( handle );return -1;}if (stor_size != NULL){*stor_size += send_len;}}close( d_sock );close( handle );//向服务器接收返回值bzero(buf, sizeof(buf));len = recv( c_sock, buf, 512, 0 );buf[len] = 0;sscanf( buf, "%d", &result );if ( result >= 300 ) {return result;}return 0;
}
//修改文件名&移动目录
int ftp_renamefile( int c_sock, char *s, char *d )
{char    buf[512];int     re;sprintf( buf, "RNFR %s\r\n", s );re = ftp_sendcmd( c_sock, buf );if ( re != 350 ) return re;sprintf( buf, "RNTO %s\r\n", d );re = ftp_sendcmd( c_sock, buf );if ( re != 250 ) return re;return 0;
}
//删除文件
int ftp_deletefile( int c_sock, char *s )
{char    buf[512];int     re;sprintf( buf, "DELE %s\r\n", s );re = ftp_sendcmd( c_sock, buf );if ( re != 250 ) return re;return 0;
}
//删除目录
int ftp_deletefolder( int c_sock, char *s )
{char    buf[512];int     re;sprintf( buf, "RMD %s\r\n", s );re = ftp_sendcmd( c_sock, buf );if ( re != 250 ) return re;return 0;
}
//链接服务器
int ftp_connect( char *host, int port, char *user, char *pwd )
{int     c_sock;c_sock = connect_server( host, port );if ( c_sock == -1 ) return -1;if ( login_server( c_sock, user, pwd ) == -1 ) {close( c_sock );return -1;}return c_sock;
}
//断开服务器
int ftp_quit( int c_sock)
{int re = 0;re = ftp_sendcmd( c_sock, "QUIT\r\n" );close( c_sock );return re;
}

以下是调用方式 main.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "ftp.h"//gcc -o ftp ftp.h ftp.c main.cint main(){char host[13] = {0};memcpy(host,"192.168.1.190",strlen("192.168.1.190"));  //ipint port = 21;char user[5] = {0};memcpy(user,"admin",strlen("admin"));   //用户char pwd[5] = {0};memcpy(pwd,"admin",strlen("admin"));    //密码int ret = ftp_connect(host, port, user,pwd );   //连接printf("ret=%d\n",ret);char s[32] = {0};char d[32] = {0};long long unsigned int fileSize;int stop;memcpy(s,"nginx.conf",strlen("nginx.conf")); //ftp上的源文件memcpy(d,"/home/ftp/cli/demo.conf",strlen("/home/ftp/cli/demo.conf"));  //下载下来的保存文件路径int down = ftp_retrfile( ret, s,d ,&fileSize, &stop);printf("\ndown = %d,fileSize=%d,stop=%d\n",down,(int)fileSize,stop);return  0;}

gcc -o ftp ftp.h ftp.c main.c

./ftproot1@ubuntu:/home/ftp/cli$ ./ftp
ret=3down = 0,fileSize=7815,stop=0
root1@ubuntu:/home/ftp/cli$ ls
demo.conf  ftp  ftp.c  ftp.h  main.c  ng.conf
root1@ubuntu:/home/ftp/cli$

下载成功，ftp服务器自己去搭建一下就可以了。代码里的ftp用户和密码,ip地址，以及下载的文件进行参数调整就好了

以前认为ftp还是蛮复杂的，自己实现一下，感觉还是蛮简单的。有时候还是要沉下心。心静容易把事情想明白。。。。。

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