C-FTP

最近在研究FTP 客户端的实现，最初我直接使用的Cocoa 中提供的CFFTPStream 相关的函数，但最终发现用此方法实现的FTP 客户端有很大的局限性，于是我便找到了一份在Windows 上用C 语言实现的FTP 客户端代码，但在Mac OSX 系统下却编译不过，于是我便根据这份代码改写了一个份在类Unix 上可以正常使用的FTP 函数，下面帖上所有的代码：7月19日更新，修复了其实多处BUG,完善了FTP 的List,上传,下载的接口。

头文件(THFTPAPI.h): 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 //// THFTPAPI.h// MyFTP//// Created by TanHao on 13-6-6.// Copyright (c) 2013年 http://www.tanhao.me. All rights reserved. ////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, unsignedlonglong *data_len);//下载文件int ftp_retrfile( int c_sock, char *s, char *d ,unsignedlonglong *stor_size, int *stop);29 30 31 32 33 34 35 36 //上传文件int ftp_storfile( int c_sock, char *s, char *d ,unsignedlonglong *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 );实现(THFTPAPI.c): 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 //// THFTPAPI.c// MyFTP//// Created by TanHao on 13-6-6.// Copyright (c) 2013年 http://www.tanhao.me. All rights reserved. //#include "THFTPAPI.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_tslen;opvalue = 8;32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 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 timevaltimeo = {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((unsignedshort )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socketint connect_server( char *host, int port ){int ctrl_sock;char buf[512];int result;ssize_tlen;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 ) {76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 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_tr_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_tlen;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 )110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 {char buf[128];int result;sprintf( buf, "USER %s\r\n", user );result = ftp_sendcmd( sock, buf );if ( result == 230 ) return 0;elseif ( 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;132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 }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_tlen;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]);}154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 //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176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 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, unsignedlonglong *data_len) {int d_sock;char buf[512];int send_re;int result;ssize_tlen,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);198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 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 ,unsignedlonglong *stor_size, int *stop){int d_sock;ssize_tlen,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);220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 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;242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 }//上传文件int ftp_storfile( int c_sock, char *s, char *d ,unsignedlonglong *stor_size, int *stop){int d_sock;ssize_tlen,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 ||264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 (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 ){286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307char 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;}8 30 9 31 8 32 9 33 0 33 1 33 2 33 3 33 4 33 5 33 6 33 7 33 8 33 9 34 0 34 1 34 2 34 3 34 4 34 5 34 6 34 78 34 9 35 0 35 1 35 2 35 3 35 4 35 5 35 6 35 7 35 8 35 9 36 0 36 1 36 2 36 3 36 4 36 5 36 6 36 7 36 8 36 90 37 1 37 2 37 3 37 4 37 5 37 6 37 7 37 8 37 9 38 0 38 1 38 2 38 3 38 4 38 5 38 6 38 7 38 8 38 9 39 0 39 12 393 394 395 396 397 398 39 9 40 0 40 1 40 2 40 3 40 4 40 5 40 6 40 7 40 8 40 9 41 0 41 1 41 2 41 34 415 416 417 418 419 42 0 42 1 42 2 42 3 42 4 42 5 42 6 42 7 42 8 42 9 43 0 43 1 43 2 43 3 43 4 43 56 437 438 439 44 0 44 1 44 2 44 3 44 4 44 5 44 6 44 7 44 8 44 9 45 0 45 1 45 2 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