├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── common.h ├── handles.c ├── main.c ├── server.c └── server.h /.gitignore: -------------------------------------------------------------------------------- 1 | # Object files 2 | *.o 3 | *.ko 4 | *.obj 5 | *.elf 6 | 7 | # Precompiled Headers 8 | *.gch 9 | *.pch 10 | 11 | # Libraries 12 | *.lib 13 | *.a 14 | *.la 15 | *.lo 16 | 17 | # Shared objects (inc. Windows DLLs) 18 | *.dll 19 | *.so 20 | *.so.* 21 | *.dylib 22 | 23 | # Executables 24 | *.exe 25 | *.out 26 | *.app 27 | *.i*86 28 | *.x86_64 29 | *.hex 30 | 31 | # Debug files 32 | *.dSYM/ 33 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. 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It is safest 289 | to attach them to the start of each source file to most effectively 290 | convey the exclusion of warranty; and each file should have at least 291 | the "copyright" line and a pointer to where the full notice is found. 292 | 293 | {description} 294 | Copyright (C) {year} {fullname} 295 | 296 | This program is free software; you can redistribute it and/or modify 297 | it under the terms of the GNU General Public License as published by 298 | the Free Software Foundation; either version 2 of the License, or 299 | (at your option) any later version. 300 | 301 | This program is distributed in the hope that it will be useful, 302 | but WITHOUT ANY WARRANTY; without even the implied warranty of 303 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 304 | GNU General Public License for more details. 305 | 306 | You should have received a copy of the GNU General Public License along 307 | with this program; if not, write to the Free Software Foundation, Inc., 308 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 309 | 310 | Also add information on how to contact you by electronic and paper mail. 311 | 312 | If the program is interactive, make it output a short notice like this 313 | when it starts in an interactive mode: 314 | 315 | Gnomovision version 69, Copyright (C) year name of author 316 | Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 317 | This is free software, and you are welcome to redistribute it 318 | under certain conditions; type `show c' for details. 319 | 320 | The hypothetical commands `show w' and `show c' should show the appropriate 321 | parts of the General Public License. Of course, the commands you use may 322 | be called something other than `show w' and `show c'; they could even be 323 | mouse-clicks or menu items--whatever suits your program. 324 | 325 | You should also get your employer (if you work as a programmer) or your 326 | school, if any, to sign a "copyright disclaimer" for the program, if 327 | necessary. Here is a sample; alter the names: 328 | 329 | Yoyodyne, Inc., hereby disclaims all copyright interest in the program 330 | `Gnomovision' (which makes passes at compilers) written by James Hacker. 331 | 332 | {signature of Ty Coon}, 1 April 1989 333 | Ty Coon, President of Vice 334 | 335 | This General Public License does not permit incorporating your program into 336 | proprietary programs. If your program is a subroutine library, you may 337 | consider it more useful to permit linking proprietary applications with the 338 | library. If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | 341 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | #makefile 2 | cc = gcc 3 | flag = -lpthread 4 | ftp_server : main.o server.o handles.o 5 | $(cc) main.o server.o handles.o $(flag) -o ftp_server 6 | 7 | main.o : main.c server.h 8 | $(cc) -c main.c $(flag) 9 | 10 | server.o : server.c server.h common.h 11 | $(cc) -c server.c $(flag) 12 | 13 | handles.o : handles.c common.h 14 | $(cc) -c handles.c 15 | 16 | clean : 17 | rm ftp_server *.o -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ftp server c version 2 | 3 | This is a ftp server program written in c .I modified from this version,using threads instead of processes.[original address](https://github.com/Siim/ftp). 4 | You can run it only on linux. 5 | 6 | # Compilation and Run 7 | ```c 8 | # cd to the ftp server dir 9 | make 10 | # execute with ./ftp_server 11 | ``` 12 | 13 | # Function introduction 14 | 1. Please run as root. 15 | 2. Default binding port is 8021. You can change it to any port such as 21. 16 | 3. Only supports anonymous users. 17 | 4. Program directory for the FTP root directory 18 | 5. Supported ftp commands include:PASV LIST CWD PWD MKD RMD RETR STOR DELE SIZE ABOR QUIT TYPE NOOP 19 | -------------------------------------------------------------------------------- /common.h: -------------------------------------------------------------------------------- 1 | #define _GNU_SOURCE 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | #include 14 | #include 15 | 16 | #ifndef BSIZE 17 | #define BSIZE 1024 18 | #endif 19 | //定义服务器根目录 20 | #define SERVERROOTPATH "/home/tom" 21 | 22 | typedef struct Port 23 | { 24 | int p1; 25 | int p2; 26 | } Port; 27 | 28 | typedef struct State 29 | { 30 | /* Connection mode: NORMAL, SERVER, CLIENT */ 31 | int mode; 32 | 33 | /* Is user loggd in? */ 34 | int logged_in; 35 | 36 | /* Is this username allowed? */ 37 | int username_ok; 38 | char *username; 39 | 40 | /* Response message to client e.g. 220 Welcome */ 41 | char *message; 42 | 43 | /* Commander connection */ 44 | int connection; 45 | 46 | /* Socket for passive connection (must be accepted later) */ 47 | int sock_pasv; 48 | 49 | /* Transfer process id */ 50 | int tr_pid; 51 | 52 | } State; 53 | 54 | 55 | /* Command struct */ 56 | typedef struct Command 57 | { 58 | char command[5]; 59 | char arg[BSIZE]; 60 | } Command; 61 | 62 | /** 63 | * Connection mode 64 | * NORMAL - normal connection mode, nothing to transfer 65 | * SERVER - passive connection (PASV command), server listens 66 | * CLIENT - server connects to client (PORT command) 67 | */ 68 | typedef enum conn_mode{ NORMAL, SERVER, CLIENT }conn_mode; 69 | 70 | /* Commands enumeration */ 71 | typedef enum cmdlist 72 | { 73 | ABOR, CWD, DELE, LIST, MDTM, MKD, NLST, PASS, PASV, 74 | PORT, PWD, QUIT, RETR, RMD, RNFR, RNTO, SITE, SIZE, 75 | STOR, TYPE, USER, NOOP 76 | } cmdlist; 77 | 78 | /* String mappings for cmdlist */ 79 | static const char *cmdlist_str[] = 80 | { 81 | "ABOR", "CWD", "DELE", "LIST", "MDTM", "MKD", "NLST", "PASS", "PASV", 82 | "PORT", "PWD", "QUIT", "RETR", "RMD", "RNFR", "RNTO", "SITE", "SIZE", 83 | "STOR", "TYPE", "USER", "NOOP" 84 | }; 85 | 86 | /* Valid usernames for anonymous ftp */ 87 | static const char *usernames[] = 88 | { 89 | "ftp","anonymous","public","anon","test","foo","siim" 90 | }; 91 | 92 | /* Welcome message */ 93 | static char *welcome_message = "A very warm welcome!"; 94 | 95 | /* Server functions */ 96 | void gen_port(Port *); 97 | void parse_command(char *, Command *); 98 | int create_socket(int port); 99 | void write_state(State *); 100 | int accept_connection(int); 101 | 102 | /* Commands handle functions*/ 103 | void response(Command *, State *); 104 | void ftp_user(Command *, State *); 105 | void ftp_pass(Command *, State *); 106 | void ftp_pwd(Command *, State *); 107 | void ftp_cwd(Command *, State *); 108 | void ftp_mkd(Command *, State *); 109 | void ftp_rmd(Command *, State *); 110 | void ftp_pasv(Command *, State *); 111 | void ftp_list(Command *, State *); 112 | void ftp_retr(Command *, State *); 113 | void ftp_stor(Command *, State *); 114 | void ftp_dele(Command *, State *); 115 | void ftp_size(Command *, State *); 116 | void ftp_quit(State *); 117 | void ftp_type(Command *, State *); 118 | void ftp_abor(State *); 119 | 120 | void str_perm(int, char *); 121 | void my_wait(int); 122 | -------------------------------------------------------------------------------- /handles.c: -------------------------------------------------------------------------------- 1 | #include "common.h" 2 | /** 3 | * Generates response message for client 4 | * @param cmd Current command 5 | * @param state Current connection state 6 | */ 7 | void response(Command *cmd, State *state) 8 | { 9 | switch(lookup_cmd(cmd->command)){ 10 | case USER: ftp_user(cmd,state); break; 11 | case PASS: ftp_pass(cmd,state); break; 12 | case PASV: ftp_pasv(cmd,state); break; 13 | case LIST: ftp_list(cmd,state); break; 14 | case CWD: ftp_cwd(cmd,state); break; 15 | case PWD: ftp_pwd(cmd,state); break; 16 | case MKD: ftp_mkd(cmd,state); break; 17 | case RMD: ftp_rmd(cmd,state); break; 18 | case RETR: ftp_retr(cmd,state); break; 19 | case STOR: ftp_stor(cmd,state); break; 20 | case DELE: ftp_dele(cmd,state); break; 21 | case SIZE: ftp_size(cmd,state); break; 22 | case ABOR: ftp_abor(state); break; 23 | case QUIT: ftp_quit(state); break; 24 | case TYPE: ftp_type(cmd,state); break; 25 | case NOOP: 26 | if(state->logged_in){ 27 | state->message = "200 Nice to NOOP you!\n"; 28 | }else{ 29 | state->message = "530 NOOB hehe.\n"; 30 | } 31 | write_state(state); 32 | break; 33 | default: 34 | state->message = "500 Unknown command\n"; 35 | write_state(state); 36 | break; 37 | } 38 | } 39 | 40 | /** 41 | * Handle USER command 42 | * @param cmd Command with args 43 | * @param state Current client connection state 44 | */ 45 | void ftp_user(Command *cmd, State *state) 46 | { 47 | const int total_usernames = sizeof(usernames)/sizeof(char *); 48 | if(lookup(cmd->arg,usernames,total_usernames)>=0){ 49 | state->username = malloc(32); 50 | memset(state->username,0,32); 51 | strcpy(state->username,cmd->arg); 52 | state->username_ok = 1; 53 | state->message = "331 User name okay, need password\n"; 54 | }else{ 55 | state->message = "530 Invalid username\n"; 56 | } 57 | write_state(state); 58 | } 59 | 60 | /** PASS command */ 61 | void ftp_pass(Command *cmd, State *state) 62 | { 63 | if(state->username_ok==1){ 64 | state->logged_in = 1; 65 | state->message = "230 Login successful\n"; 66 | }else{ 67 | state->message = "500 Invalid username or password\n"; 68 | } 69 | write_state(state); 70 | } 71 | 72 | /** PASV command */ 73 | void ftp_pasv(Command *cmd, State *state) 74 | { 75 | if(state->logged_in){ 76 | int ip[4]; 77 | char buff[255]; 78 | char *response = "227 Entering Passive Mode (%d,%d,%d,%d,%d,%d)\n"; 79 | Port *port = malloc(sizeof(Port)); 80 | gen_port(port); 81 | getip(state->connection,ip); 82 | 83 | /* Close previous passive socket? */ 84 | //close(state->sock_pasv); 85 | 86 | /* Start listening here, but don't accept the connection */ 87 | state->sock_pasv = create_socket((256*port->p1)+port->p2); 88 | printf("port: %d\n",256*port->p1+port->p2); 89 | sprintf(buff,response,ip[0],ip[1],ip[2],ip[3],port->p1,port->p2); 90 | state->message = buff; 91 | state->mode = SERVER; 92 | puts(state->message); 93 | 94 | }else{ 95 | state->message = "530 Please login with USER and PASS.\n"; 96 | printf("%s",state->message); 97 | } 98 | write_state(state); 99 | } 100 | 101 | /** LIST command */ 102 | void ftp_list(Command *cmd, State *state) 103 | { 104 | if(state->logged_in==1){ 105 | struct dirent *entry; 106 | struct stat statbuf; 107 | struct tm *time; 108 | char timebuff[80], current_dir[BSIZE]; 109 | int connection; 110 | time_t rawtime; 111 | 112 | /* TODO: dynamic buffering maybe? */ 113 | char cwd[BSIZE], cwd_orig[BSIZE]; 114 | memset(cwd,0,BSIZE); 115 | memset(cwd_orig,0,BSIZE); 116 | 117 | /* Later we want to go to the original path */ 118 | getcwd(cwd_orig,BSIZE); 119 | 120 | /* Just chdir to specified path */ 121 | if(strlen(cmd->arg)>0&&cmd->arg[0]!='-'){ 122 | chdir(cmd->arg); 123 | } 124 | 125 | getcwd(cwd,BSIZE); 126 | DIR *dp = opendir(cwd); 127 | 128 | if(!dp){ 129 | state->message = "550 Failed to open directory.\n"; 130 | }else{ 131 | if(state->mode == SERVER){ 132 | 133 | connection = accept_connection(state->sock_pasv); 134 | state->message = "150 Here comes the directory listing.\n"; 135 | puts(state->message); 136 | 137 | while(entry=readdir(dp)){ 138 | if(stat(entry->d_name,&statbuf)==-1){ 139 | fprintf(stderr, "FTP: Error reading file stats...\n"); 140 | }else{ 141 | char *perms = malloc(9); 142 | memset(perms,0,9); 143 | 144 | /* Convert time_t to tm struct */ 145 | rawtime = statbuf.st_mtime; 146 | time = localtime(&rawtime); 147 | strftime(timebuff,80,"%b %d %H:%M",time); 148 | str_perm((statbuf.st_mode & ALLPERMS), perms); 149 | dprintf(connection, 150 | "%c%s %5d %4d %4d %8d %s %s\r\n", 151 | (entry->d_type==DT_DIR)?'d':'-', 152 | perms,statbuf.st_nlink, 153 | statbuf.st_uid, 154 | statbuf.st_gid, 155 | statbuf.st_size, 156 | timebuff, 157 | entry->d_name); 158 | } 159 | } 160 | write_state(state); 161 | state->message = "226 Directory send OK.\n"; 162 | state->mode = NORMAL; 163 | close(connection); 164 | close(state->sock_pasv); 165 | 166 | }else if(state->mode == CLIENT){ 167 | state->message = "502 Command not implemented.\n"; 168 | }else{ 169 | state->message = "425 Use PASV or PORT first.\n"; 170 | } 171 | } 172 | closedir(dp); 173 | chdir(cwd_orig); 174 | }else{ 175 | state->message = "530 Please login with USER and PASS.\n"; 176 | } 177 | state->mode = NORMAL; 178 | write_state(state); 179 | } 180 | 181 | 182 | /** QUIT command */ 183 | void ftp_quit(State *state) 184 | { 185 | state->message = "221 Goodbye, friend. I never thought I'd die like this.\n"; 186 | write_state(state); 187 | close(state->connection); 188 | exit(0); 189 | } 190 | 191 | /** PWD command */ 192 | void ftp_pwd(Command *cmd, State *state) 193 | { 194 | if(state->logged_in){ 195 | char cwd[BSIZE]; 196 | char result[BSIZE]; 197 | memset(result, 0, BSIZE); 198 | if(getcwd(cwd,BSIZE)!=NULL){ 199 | strcat(result,"257 \""); 200 | strcat(result,cwd); 201 | strcat(result,"\"\n"); 202 | state->message = result; 203 | }else{ 204 | state->message = "550 Failed to get pwd.\n"; 205 | } 206 | write_state(state); 207 | } 208 | } 209 | 210 | /** CWD command */ 211 | void ftp_cwd(Command *cmd, State *state) 212 | { 213 | if(state->logged_in){ 214 | // char cwd[BSIZE] = ""; 215 | // if((cmd->arg[0] - '/') == 0){ 216 | // strcpy(cwd,SERVERROOTPATH); 217 | // strcat(cwd,cmd->arg); 218 | // }else{ 219 | // strcpy(cwd,cmd->arg); 220 | // } 221 | 222 | if(chdir(cmd->arg) == 0){ 223 | state->message = "250 Directory successfully changed.\n"; 224 | }else{ 225 | state->message = "550 Failed to change directory.\n"; 226 | } 227 | }else{ 228 | state->message = "500 Login with USER and PASS.\n"; 229 | } 230 | write_state(state); 231 | 232 | } 233 | 234 | /** 235 | * MKD command 236 | * TODO: full path directory creation 237 | */ 238 | void ftp_mkd(Command *cmd, State *state) 239 | { 240 | if(state->logged_in){ 241 | char cwd[BSIZE]; 242 | char res[BSIZE]; 243 | memset(cwd,0,BSIZE); 244 | memset(res,0,BSIZE); 245 | getcwd(cwd,BSIZE); 246 | 247 | /* TODO: check if directory already exists with chdir? */ 248 | 249 | /* Absolute path */ 250 | if(cmd->arg[0]=='/'){ 251 | if(mkdir(cmd->arg,S_IRWXU)==0){ 252 | strcat(res,"257 \""); 253 | strcat(res,cmd->arg); 254 | strcat(res,"\" new directory created.\n"); 255 | state->message = res; 256 | }else{ 257 | state->message = "550 Failed to create directory. Check path or permissions.\n"; 258 | } 259 | } 260 | /* Relative path */ 261 | else{ 262 | if(mkdir(cmd->arg,S_IRWXU)==0){ 263 | sprintf(res,"257 \"%s/%s\" new directory created.\n",cwd,cmd->arg); 264 | state->message = res; 265 | }else{ 266 | state->message = "550 Failed to create directory.\n"; 267 | } 268 | } 269 | }else{ 270 | state->message = "500 Good news, everyone! There's a report on TV with some very bad news!\n"; 271 | } 272 | write_state(state); 273 | } 274 | 275 | /** RETR command 下载文件*/ 276 | void ftp_retr(Command *cmd, State *state) 277 | { 278 | int connection; 279 | int fd; 280 | struct stat stat_buf; 281 | off_t offset = 0; 282 | int sent_total = 0; 283 | if(state->logged_in){ 284 | 285 | /* Passive mode */ 286 | if(state->mode == SERVER){ 287 | if(access(cmd->arg,R_OK)==0 && (fd = open(cmd->arg,O_RDONLY))){ 288 | fstat(fd,&stat_buf); 289 | 290 | state->message = "150 Opening BINARY mode data connection.\n"; 291 | 292 | write_state(state); 293 | 294 | connection = accept_connection(state->sock_pasv); 295 | close(state->sock_pasv); 296 | if(sent_total = sendfile(connection, fd, &offset, stat_buf.st_size)){ 297 | 298 | if(sent_total != stat_buf.st_size){ 299 | perror("ftp_retr:sendfile"); 300 | exit(EXIT_SUCCESS); 301 | } 302 | 303 | state->message = "226 File send OK.\n"; 304 | }else{ 305 | state->message = "550 Failed to read file.\n"; 306 | } 307 | }else{ 308 | state->message = "550 Failed to get file\n"; 309 | } 310 | }else{ 311 | state->message = "550 Please use PASV instead of PORT.\n"; 312 | } 313 | }else{ 314 | state->message = "530 Please login with USER and PASS.\n"; 315 | } 316 | 317 | close(fd); 318 | close(connection); 319 | write_state(state); 320 | } 321 | 322 | /** Handle STOR command. TODO: check permissions. 上传文件*/ 323 | void ftp_stor(Command *cmd, State *state) 324 | { 325 | int connection, fd; 326 | off_t offset = 0; 327 | int pipefd[2]; 328 | int res = 1; 329 | const int buff_size = 8192; 330 | 331 | FILE *fp = fopen(cmd->arg,"w"); 332 | 333 | if(fp==NULL){ 334 | /* TODO: write status message here! */ 335 | perror("ftp_stor:fopen"); 336 | }else if(state->logged_in){ 337 | if(!(state->mode==SERVER)){ 338 | state->message = "550 Please use PASV instead of PORT.\n"; 339 | } 340 | /* Passive mode */ 341 | else{ 342 | fd = fileno(fp); 343 | connection = accept_connection(state->sock_pasv); 344 | close(state->sock_pasv); 345 | if(pipe(pipefd)==-1)perror("ftp_stor: pipe"); 346 | 347 | state->message = "125 Data connection already open; transfer starting.\n"; 348 | write_state(state); 349 | 350 | /* Using splice function for file receiving. 351 | * The splice() system call first appeared in Linux 2.6.17. 352 | */ 353 | 354 | while ((res = splice(connection, 0, pipefd[1], NULL, buff_size, SPLICE_F_MORE | SPLICE_F_MOVE))>0){ 355 | splice(pipefd[0], NULL, fd, 0, buff_size, SPLICE_F_MORE | SPLICE_F_MOVE); 356 | } 357 | 358 | /* TODO: signal with ABOR command to exit */ 359 | 360 | /* Internal error */ 361 | if(res==-1){ 362 | perror("ftp_stor: splice"); 363 | exit(EXIT_SUCCESS); 364 | }else{ 365 | state->message = "226 File send OK.\n"; 366 | } 367 | close(connection); 368 | close(fd); 369 | } 370 | }else{ 371 | state->message = "530 Please login with USER and PASS.\n"; 372 | } 373 | close(connection); 374 | write_state(state); 375 | } 376 | 377 | /** ABOR command */ 378 | void ftp_abor(State *state) 379 | { 380 | if(state->logged_in){ 381 | state->message = "226 Closing data connection.\n"; 382 | state->message = "225 Data connection open; no transfer in progress.\n"; 383 | }else{ 384 | state->message = "530 Please login with USER and PASS.\n"; 385 | } 386 | write_state(state); 387 | 388 | } 389 | 390 | /** 391 | * Handle TYPE command. 392 | * BINARY only at the moment. 393 | */ 394 | void ftp_type(Command *cmd,State *state) 395 | { 396 | if(state->logged_in){ 397 | if(cmd->arg[0]=='I'){ 398 | state->message = "200 Switching to Binary mode.\n"; 399 | }else if(cmd->arg[0]=='A'){ 400 | 401 | /* Type A must be always accepted according to RFC */ 402 | state->message = "200 Switching to ASCII mode.\n"; 403 | }else{ 404 | state->message = "504 Command not implemented for that parameter.\n"; 405 | } 406 | }else{ 407 | state->message = "530 Please login with USER and PASS.\n"; 408 | } 409 | write_state(state); 410 | } 411 | 412 | /** Handle DELE command */ 413 | void ftp_dele(Command *cmd,State *state) 414 | { 415 | if(state->logged_in){ 416 | if(unlink(cmd->arg)==-1){ 417 | state->message = "550 File unavailable.\n"; 418 | }else{ 419 | state->message = "250 Requested file action okay, completed.\n"; 420 | } 421 | }else{ 422 | state->message = "530 Please login with USER and PASS.\n"; 423 | } 424 | write_state(state); 425 | } 426 | 427 | /** Handle RMD */ 428 | void ftp_rmd(Command *cmd, State *state) 429 | { 430 | if(!state->logged_in){ 431 | state->message = "530 Please login first.\n"; 432 | }else{ 433 | char cmd_rm[512]; 434 | snprintf(cmd_rm,512,"rm -rf %s",cmd->arg);//change by zhaoyou 435 | if(system(cmd_rm)/*remove(cmd->arg)*/==0){ 436 | state->message = "250 Requested file action okay, completed.\n"; 437 | }else{ 438 | state->message = "550 Cannot delete directory.\n"; 439 | } 440 | } 441 | write_state(state); 442 | } 443 | 444 | /** Handle SIZE (RFC 3659) */ 445 | void ftp_size(Command *cmd, State *state) 446 | { 447 | if(state->logged_in){ 448 | struct stat statbuf; 449 | char filesize[128]; 450 | memset(filesize,0,128); 451 | /* Success */ 452 | if(stat(cmd->arg,&statbuf)==0){ 453 | sprintf(filesize, "213 %d\n", statbuf.st_size); 454 | state->message = filesize; 455 | }else{ 456 | state->message = "550 Could not get file size.\n"; 457 | } 458 | }else{ 459 | state->message = "530 Please login with USER and PASS.\n"; 460 | } 461 | write_state(state); 462 | } 463 | 464 | /** 465 | * Converts permissions to string. e.g. rwxrwxrwx 466 | * @param perm Permissions mask 467 | * @param str_perm Pointer to string representation of permissions 468 | */ 469 | void str_perm(int perm, char *str_perm) 470 | { 471 | int curperm = 0; 472 | int flag = 0; 473 | int read, write, exec; 474 | 475 | /* Flags buffer */ 476 | char fbuff[3]; 477 | read = write = exec = 0; 478 | 479 | int i; 480 | for(i = 6; i>=0; i-=3){ 481 | /* Explode permissions of user, group, others; starting with users */ 482 | curperm = ((perm & ALLPERMS) >> i ) & 0x7; 483 | 484 | memset(fbuff,0,3); 485 | /* Check rwx flags for each*/ 486 | read = (curperm >> 2) & 0x1; 487 | write = (curperm >> 1) & 0x1; 488 | exec = (curperm >> 0) & 0x1; 489 | 490 | sprintf(fbuff,"%c%c%c",read?'r':'-' ,write?'w':'-', exec?'x':'-'); 491 | strcat(str_perm,fbuff); 492 | 493 | } 494 | } 495 | -------------------------------------------------------------------------------- /main.c: -------------------------------------------------------------------------------- 1 | #include "server.h" 2 | #define SERVERPORT 8021 3 | int main(int argc, char const *argv[]) 4 | { 5 | server(SERVERPORT); 6 | return 0; 7 | } -------------------------------------------------------------------------------- /server.c: -------------------------------------------------------------------------------- 1 | #include "common.h" 2 | #include "server.h" 3 | #include 4 | //Communication 5 | void* communication(void* _c) { 6 | chdir("/"); 7 | int connection = *(int*)_c , bytes_read; 8 | char buffer[BSIZE]; 9 | Command *cmd = malloc(sizeof(Command)); 10 | State *state = malloc(sizeof(State)); 11 | state->username = NULL; //add by zhaoyou 12 | memset(buffer,0,BSIZE); 13 | char welcome[BSIZE] = "220 "; 14 | if(strlen(welcome_message) 0){ 26 | if(!(bytes_read>BSIZE) && bytes_read > 0){ 27 | /* TODO: output this to log */ 28 | printf("User %s sent command: %s\n",(state->username==0)?"unknown":state->username,buffer); 29 | parse_command(buffer,cmd); 30 | state->connection = connection; 31 | 32 | /* Ignore non-ascii char. Ignores telnet command */ 33 | if(buffer[0]<=127 || buffer[0]>=0){ 34 | response(cmd,state); 35 | } 36 | memset(buffer,0,BSIZE); 37 | memset(cmd,0,sizeof(cmd)); 38 | }else{ 39 | /* Read error */ 40 | perror("server:read"); 41 | } 42 | } 43 | close(connection); 44 | printf("Client disconnected.\n"); 45 | return NULL ; 46 | } 47 | 48 | /** 49 | * Sets up server and handles incoming connections 50 | * @param port Server port 51 | */ 52 | void server(int port) 53 | { 54 | //set defaul ftp server root work path.You can customize the path. 55 | if(chroot(SERVERROOTPATH) !=0 ) 56 | { 57 | printf("%s","chroot erro：please run as root!\n"); 58 | exit(0); 59 | } 60 | int sock = create_socket(port); 61 | struct sockaddr_in client_address; 62 | int len = sizeof(client_address); 63 | while(1){ 64 | int *connection = (int*)malloc(sizeof(int)); 65 | *connection = accept(sock, (struct sockaddr*) &client_address,&len); 66 | 67 | pthread_t pid; 68 | pthread_create(&pid, NULL, communication, (void*) (connection)); 69 | } 70 | } 71 | 72 | /** 73 | * Creates socket on specified port and starts listening to this socket 74 | * @param port Listen on this port 75 | * @return int File descriptor for new socket 76 | */ 77 | int create_socket(int port) 78 | { 79 | int sock; 80 | int reuse = 1; 81 | struct sockaddr_in server_address = (struct sockaddr_in){ 82 | AF_INET, 83 | htons(port), 84 | (struct in_addr){INADDR_ANY} 85 | }; 86 | 87 | 88 | if((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0){ 89 | fprintf(stderr, "Cannot open socket"); 90 | exit(EXIT_FAILURE); 91 | } 92 | 93 | /* Address can be reused instantly after program exits */ 94 | setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof reuse); 95 | 96 | /* Bind socket to server address */ 97 | if(bind(sock,(struct sockaddr*) &server_address, sizeof(server_address)) < 0){ 98 | fprintf(stderr, "Cannot bind socket to address"); 99 | exit(EXIT_FAILURE); 100 | } 101 | 102 | listen(sock,5); 103 | return sock; 104 | } 105 | 106 | /** 107 | * Accept connection from client 108 | * @param socket Server listens this 109 | * @return int File descriptor to accepted connection 110 | */ 111 | int accept_connection(int socket) 112 | { 113 | int addrlen = 0; 114 | struct sockaddr_in client_address; 115 | addrlen = sizeof(client_address); 116 | return accept(socket,(struct sockaddr*) &client_address,&addrlen); 117 | } 118 | 119 | /** 120 | * Get ip where client connected to 121 | * @param sock Commander socket connection 122 | * @param ip Result ip array (length must be 4 or greater) 123 | * result IP array e.g. {127,0,0,1} 124 | */ 125 | void getip(int sock, int *ip) 126 | { 127 | socklen_t addr_size = sizeof(struct sockaddr_in); 128 | struct sockaddr_in addr; 129 | getsockname(sock, (struct sockaddr *)&addr, &addr_size); 130 | int host,i; 131 | 132 | host = (addr.sin_addr.s_addr); 133 | for(i=0; i<4; i++){ 134 | ip[i] = (host>>i*8)&0xff; 135 | } 136 | } 137 | 138 | /** 139 | * Lookup enum value of string 140 | * @param cmd Command string 141 | * @return Enum index if command found otherwise -1 142 | */ 143 | 144 | int lookup_cmd(char *cmd){ 145 | const int cmdlist_count = sizeof(cmdlist_str)/sizeof(char *); 146 | return lookup(cmd, cmdlist_str, cmdlist_count); 147 | } 148 | 149 | /** 150 | * General lookup for string arrays 151 | * It is suitable for smaller arrays, for bigger ones trie is better 152 | * data structure for instance. 153 | * @param needle String to lookup 154 | * @param haystack Strign array 155 | * @param count Size of haystack 156 | */ 157 | int lookup(char *needle, const char **haystack, int count) 158 | { 159 | int i; 160 | for(i=0;iconnection, state->message, strlen(state->message)); 173 | } 174 | 175 | /** 176 | * Generate random port for passive mode 177 | * @param state Client state 178 | */ 179 | void gen_port(Port *port) 180 | { 181 | srand(time(NULL)); 182 | port->p1 = 128 + (rand() % 64); 183 | port->p2 = rand() % 0xff; 184 | 185 | } 186 | 187 | /** 188 | * Parses FTP command string into struct 189 | * @param cmdstring Command string (from ftp client) 190 | * @param cmd Command struct 191 | */ 192 | void parse_command(char *cmdstring, Command *cmd) 193 | { 194 | sscanf(cmdstring,"%s %s",cmd->command,cmd->arg); 195 | } 196 | 197 | /** 198 | * Handles zombies 199 | * @param signum Signal number 200 | */ 201 | void my_wait(int signum) 202 | { 203 | int status; 204 | wait(&status); 205 | } 206 | 207 | -------------------------------------------------------------------------------- /server.h: -------------------------------------------------------------------------------- 1 | #ifndef SERVER_H 2 | #define SERVER_H 3 | 4 | 5 | extern void server(int port); 6 | 7 | #endif // SERVER_H 8 | 9 | --------------------------------------------------------------------------------