uftps.h

   1 /*
   2  * User FTP Server,  Share folders over FTP without being root.
   3  * Copyright (C) 2008  Isaac Jurado
   4  *
   5  * This program is free software; you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free Software
   7  * Foundation; either version 2 of the License, or (at your option) any later
   8  * version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  18  */
  19
  20 /*
  21  * Common definitions and some platform independence
  22  */
  23
  24 /* Large file support */
  25 #define _FILE_OFFSET_BITS   64
  26 #define _LARGEFILE_SOURCE
  27 #define _LARGEFILE64_SOURCE
  28
  29 #include <stddef.h>
  30 #include <string.h>
  31
  32 /* Debug support */
  33 #ifdef DEBUG
  34 extern void debug_msg (const char *format, ...);
  35 #else
  36 #define debug_msg(format, ...)
  37 #endif /* DEBUG */
  38
  39 /* Constants */
  40 #define DEFAULT_PORT 2211
  41 #define LINE_SIZE    4096  /* Same value as PATH_MAX */
  42
  43 /* Recognized commands; please keep it sorted with the same criteria as in
  44  * gendfa.pl */
  45 typedef enum _Command {
  46         FTP_NONE = 0,
  47         FTP_ABOR, FTP_ACCT, FTP_ALLO, FTP_APPE, FTP_CDUP, FTP_CWD,  FTP_DELE,
  48         FTP_FEAT, FTP_HELP, FTP_LIST, FTP_MDTM, FTP_MKD,  FTP_MODE, FTP_NLST,
  49         FTP_NOOP, FTP_OPTS, FTP_PASS, FTP_PASV, FTP_PORT, FTP_PWD,  FTP_QUIT,
  50         FTP_REIN, FTP_REST, FTP_RETR, FTP_RMD,  FTP_RNFR, FTP_RNTO, FTP_SITE,
  51         FTP_SIZE, FTP_SMNT, FTP_STAT, FTP_STOR, FTP_STOU, FTP_STRU, FTP_SYST,
  52         FTP_TYPE, FTP_USER
  53 } command_t;
  54
  55 /* Buffers */
  56 extern char LineBuf[LINE_SIZE]; /* Incoming command line buffer */
  57 extern char AuxBuf[LINE_SIZE];  /* Auxiliary buffer */
  58
  59 /* chroot() emulation */
  60 extern char *Basedir;
  61 extern int   Basedir_len;
  62
  63 /* Session state information (prefixed by "S_") */
  64 extern int       S_cmd_sk;          /* Control channel */
  65 extern int       S_data_sk;         /* Data channel */
  66 extern int       S_passive_bind_sk; /* Cached data socket for passive mode */
  67 extern int       S_passive_mode;    /* Passive mode flag */
  68 extern long long S_offset;          /* Last REST offset accepted */
  69 extern char      S_passive_str[64]; /* Cached reply for PASV */
  70 extern char     *S_arg;             /* Pointer to comand line argument */
  71
  72
  73 /***************************  FUNCTION PROTOTYPES  ***************************/
  74
  75 void      init_session   (int cmd_sk);        /* init_session.c */
  76 command_t next_command   (void);              /* next_command.c */
  77 void      command_loop   (void);              /* command_loop.c */
  78 void      change_dir     (void);              /* change_dir.c */
  79 void      client_port    (void);              /* client_port.c */
  80 void      send_file      (void);              /* send_file.c */
  81 void      file_stats     (int type);          /* file_stats.c */
  82 void      list_dir       (int full_list);     /* list_dir.c */
  83 void      fatal          (char *msg);         /* misc.c */
  84 void      send_reply     (int sk, char *msg); /*   |    */
  85 int       path_is_secure (char *path);        /*  _/    */
  86
  87
  88 /* Inline utility functions */
  89 static inline char *
  90 expanded_arg (void)
  91 {
  92         if (S_arg != NULL && S_arg[0] == '/') {
  93                 strncpy(AuxBuf, Basedir, Basedir_len);
  94                 AuxBuf[Basedir_len] = '\0';
  95                 strncat(AuxBuf, S_arg, LINE_SIZE - Basedir_len);
  96                 S_arg = AuxBuf;
  97         }
  98
  99         return S_arg;
 100 }
 101