sftp-common.c

   1 /* $OpenBSD: sftp-common.c,v 1.20 2006/08/03 03:34:42 deraadt Exp $ */
   2 /*
   3  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
   4  * Copyright (c) 2001 Damien Miller.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "includes.h"
  28
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <sys/param.h>
  32
  33 #include <grp.h>
  34 #include <pwd.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <time.h>
  38 #include <stdarg.h>
  39
  40 #include "xmalloc.h"
  41 #include "buffer.h"
  42 #include "log.h"
  43
  44 #include "sftp.h"
  45 #include "sftp-common.h"
  46
  47 /* Clear contents of attributes structure */
  48 void
  49 attrib_clear(Attrib *a)
  50 {
  51         a->flags = 0;
  52         a->size = 0;
  53         a->uid = 0;
  54         a->gid = 0;
  55         a->perm = 0;
  56         a->atime = 0;
  57         a->mtime = 0;
  58 }
  59
  60 /* Convert from struct stat to filexfer attribs */
  61 void
  62 stat_to_attrib(const struct stat *st, Attrib *a)
  63 {
  64         attrib_clear(a);
  65         a->flags = 0;
  66         a->flags |= SSH2_FILEXFER_ATTR_SIZE;
  67         a->size = st->st_size;
  68         a->flags |= SSH2_FILEXFER_ATTR_UIDGID;
  69         a->uid = st->st_uid;
  70         a->gid = st->st_gid;
  71         a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
  72         a->perm = st->st_mode;
  73         a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME;
  74         a->atime = st->st_atime;
  75         a->mtime = st->st_mtime;
  76 }
  77
  78 /* Convert from filexfer attribs to struct stat */
  79 void
  80 attrib_to_stat(const Attrib *a, struct stat *st)
  81 {
  82         memset(st, 0, sizeof(*st));
  83
  84         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
  85                 st->st_size = a->size;
  86         if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
  87                 st->st_uid = a->uid;
  88                 st->st_gid = a->gid;
  89         }
  90         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
  91                 st->st_mode = a->perm;
  92         if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
  93                 st->st_atime = a->atime;
  94                 st->st_mtime = a->mtime;
  95         }
  96 }
  97
  98 /* Decode attributes in buffer */
  99 Attrib *
 100 decode_attrib(Buffer *b)
 101 {
 102         static Attrib a;
 103
 104         attrib_clear(&a);
 105         a.flags = buffer_get_int(b);
 106         if (a.flags & SSH2_FILEXFER_ATTR_SIZE)
 107                 a.size = buffer_get_int64(b);
 108         if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
 109                 a.uid = buffer_get_int(b);
 110                 a.gid = buffer_get_int(b);
 111         }
 112         if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 113                 a.perm = buffer_get_int(b);
 114         if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
 115                 a.atime = buffer_get_int(b);
 116                 a.mtime = buffer_get_int(b);
 117         }
 118         /* vendor-specific extensions */
 119         if (a.flags & SSH2_FILEXFER_ATTR_EXTENDED) {
 120                 char *type, *data;
 121                 int i, count;
 122
 123                 count = buffer_get_int(b);
 124                 for (i = 0; i < count; i++) {
 125                         type = buffer_get_string(b, NULL);
 126                         data = buffer_get_string(b, NULL);
 127                         debug3("Got file attribute \"%s\"", type);
 128                         xfree(type);
 129                         xfree(data);
 130                 }
 131         }
 132         return &a;
 133 }
 134
 135 /* Encode attributes to buffer */
 136 void
 137 encode_attrib(Buffer *b, const Attrib *a)
 138 {
 139         buffer_put_int(b, a->flags);
 140         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 141                 buffer_put_int64(b, a->size);
 142         if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
 143                 buffer_put_int(b, a->uid);
 144                 buffer_put_int(b, a->gid);
 145         }
 146         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 147                 buffer_put_int(b, a->perm);
 148         if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
 149                 buffer_put_int(b, a->atime);
 150                 buffer_put_int(b, a->mtime);
 151         }
 152 }
 153
 154 /* Convert from SSH2_FX_ status to text error message */
 155 const char *
 156 fx2txt(int status)
 157 {
 158         switch (status) {
 159         case SSH2_FX_OK:
 160                 return("No error");
 161         case SSH2_FX_EOF:
 162                 return("End of file");
 163         case SSH2_FX_NO_SUCH_FILE:
 164                 return("No such file or directory");
 165         case SSH2_FX_PERMISSION_DENIED:
 166                 return("Permission denied");
 167         case SSH2_FX_FAILURE:
 168                 return("Failure");
 169         case SSH2_FX_BAD_MESSAGE:
 170                 return("Bad message");
 171         case SSH2_FX_NO_CONNECTION:
 172                 return("No connection");
 173         case SSH2_FX_CONNECTION_LOST:
 174                 return("Connection lost");
 175         case SSH2_FX_OP_UNSUPPORTED:
 176                 return("Operation unsupported");
 177         default:
 178                 return("Unknown status");
 179         }
 180         /* NOTREACHED */
 181 }
 182
 183 /*
 184  * drwxr-xr-x    5 markus   markus       1024 Jan 13 18:39 .ssh
 185  */
 186 char *
 187 ls_file(const char *name, const struct stat *st, int remote)
 188 {
 189         int ulen, glen, sz = 0;
 190         struct passwd *pw;
 191         struct group *gr;
 192         struct tm *ltime = localtime(&st->st_mtime);
 193         char *user, *group;
 194         char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1];
 195
 196         strmode(st->st_mode, mode);
 197         if (!remote && (pw = getpwuid(st->st_uid)) != NULL) {
 198                 user = pw->pw_name;
 199         } else {
 200                 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid);
 201                 user = ubuf;
 202         }
 203         if (!remote && (gr = getgrgid(st->st_gid)) != NULL) {
 204                 group = gr->gr_name;
 205         } else {
 206                 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid);
 207                 group = gbuf;
 208         }
 209         if (ltime != NULL) {
 210                 if (time(NULL) - st->st_mtime < (365*24*60*60)/2)
 211                         sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime);
 212                 else
 213                         sz = strftime(tbuf, sizeof tbuf, "%b %e  %Y", ltime);
 214         }
 215         if (sz == 0)
 216                 tbuf[0] = '\0';
 217         ulen = MAX(strlen(user), 8);
 218         glen = MAX(strlen(group), 8);
 219         snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8llu %s %s", mode,
 220             (u_int)st->st_nlink, ulen, user, glen, group,
 221             (unsigned long long)st->st_size, tbuf, name);
 222         return xstrdup(buf);
 223 }