crypto/openssh/sftp-common.c

   1 /* $OpenBSD: sftp-common.c,v 1.26 2014/01/09 03:26:00 guenther 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 <stdlib.h>
  37 #include <string.h>
  38 #include <time.h>
  39 #include <stdarg.h>
  40 #ifdef HAVE_UTIL_H
  41 #include <util.h>
  42 #endif
  43
  44 #include "xmalloc.h"
  45 #include "buffer.h"
  46 #include "log.h"
  47
  48 #include "sftp.h"
  49 #include "sftp-common.h"
  50
  51 /* Clear contents of attributes structure */
  52 void
  53 attrib_clear(Attrib *a)
  54 {
  55         a->flags = 0;
  56         a->size = 0;
  57         a->uid = 0;
  58         a->gid = 0;
  59         a->perm = 0;
  60         a->atime = 0;
  61         a->mtime = 0;
  62 }
  63
  64 /* Convert from struct stat to filexfer attribs */
  65 void
  66 stat_to_attrib(const struct stat *st, Attrib *a)
  67 {
  68         attrib_clear(a);
  69         a->flags = 0;
  70         a->flags |= SSH2_FILEXFER_ATTR_SIZE;
  71         a->size = st->st_size;
  72         a->flags |= SSH2_FILEXFER_ATTR_UIDGID;
  73         a->uid = st->st_uid;
  74         a->gid = st->st_gid;
  75         a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS;
  76         a->perm = st->st_mode;
  77         a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME;
  78         a->atime = st->st_atime;
  79         a->mtime = st->st_mtime;
  80 }
  81
  82 /* Convert from filexfer attribs to struct stat */
  83 void
  84 attrib_to_stat(const Attrib *a, struct stat *st)
  85 {
  86         memset(st, 0, sizeof(*st));
  87
  88         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
  89                 st->st_size = a->size;
  90         if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
  91                 st->st_uid = a->uid;
  92                 st->st_gid = a->gid;
  93         }
  94         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
  95                 st->st_mode = a->perm;
  96         if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
  97                 st->st_atime = a->atime;
  98                 st->st_mtime = a->mtime;
  99         }
 100 }
 101
 102 /* Decode attributes in buffer */
 103 Attrib *
 104 decode_attrib(Buffer *b)
 105 {
 106         static Attrib a;
 107
 108         attrib_clear(&a);
 109         a.flags = buffer_get_int(b);
 110         if (a.flags & SSH2_FILEXFER_ATTR_SIZE)
 111                 a.size = buffer_get_int64(b);
 112         if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
 113                 a.uid = buffer_get_int(b);
 114                 a.gid = buffer_get_int(b);
 115         }
 116         if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 117                 a.perm = buffer_get_int(b);
 118         if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
 119                 a.atime = buffer_get_int(b);
 120                 a.mtime = buffer_get_int(b);
 121         }
 122         /* vendor-specific extensions */
 123         if (a.flags & SSH2_FILEXFER_ATTR_EXTENDED) {
 124                 char *type, *data;
 125                 int i, count;
 126
 127                 count = buffer_get_int(b);
 128                 for (i = 0; i < count; i++) {
 129                         type = buffer_get_string(b, NULL);
 130                         data = buffer_get_string(b, NULL);
 131                         debug3("Got file attribute \"%s\"", type);
 132                         free(type);
 133                         free(data);
 134                 }
 135         }
 136         return &a;
 137 }
 138
 139 /* Encode attributes to buffer */
 140 void
 141 encode_attrib(Buffer *b, const Attrib *a)
 142 {
 143         buffer_put_int(b, a->flags);
 144         if (a->flags & SSH2_FILEXFER_ATTR_SIZE)
 145                 buffer_put_int64(b, a->size);
 146         if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
 147                 buffer_put_int(b, a->uid);
 148                 buffer_put_int(b, a->gid);
 149         }
 150         if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
 151                 buffer_put_int(b, a->perm);
 152         if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
 153                 buffer_put_int(b, a->atime);
 154                 buffer_put_int(b, a->mtime);
 155         }
 156 }
 157
 158 /* Convert from SSH2_FX_ status to text error message */
 159 const char *
 160 fx2txt(int status)
 161 {
 162         switch (status) {
 163         case SSH2_FX_OK:
 164                 return("No error");
 165         case SSH2_FX_EOF:
 166                 return("End of file");
 167         case SSH2_FX_NO_SUCH_FILE:
 168                 return("No such file or directory");
 169         case SSH2_FX_PERMISSION_DENIED:
 170                 return("Permission denied");
 171         case SSH2_FX_FAILURE:
 172                 return("Failure");
 173         case SSH2_FX_BAD_MESSAGE:
 174                 return("Bad message");
 175         case SSH2_FX_NO_CONNECTION:
 176                 return("No connection");
 177         case SSH2_FX_CONNECTION_LOST:
 178                 return("Connection lost");
 179         case SSH2_FX_OP_UNSUPPORTED:
 180                 return("Operation unsupported");
 181         default:
 182                 return("Unknown status");
 183         }
 184         /* NOTREACHED */
 185 }
 186
 187 /*
 188  * drwxr-xr-x    5 markus   markus       1024 Jan 13 18:39 .ssh
 189  */
 190 char *
 191 ls_file(const char *name, const struct stat *st, int remote, int si_units)
 192 {
 193         int ulen, glen, sz = 0;
 194         struct tm *ltime = localtime(&st->st_mtime);
 195         char *user, *group;
 196         char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1];
 197         char sbuf[FMT_SCALED_STRSIZE];
 198         time_t now;
 199
 200         strmode(st->st_mode, mode);
 201         if (!remote) {
 202                 user = user_from_uid(st->st_uid, 0);
 203         } else {
 204                 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid);
 205                 user = ubuf;
 206         }
 207         if (!remote) {
 208                 group = group_from_gid(st->st_gid, 0);
 209         } else {
 210                 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid);
 211                 group = gbuf;
 212         }
 213         if (ltime != NULL) {
 214                 now = time(NULL);
 215                 if (now - (365*24*60*60)/2 < st->st_mtime &&
 216                     now >= st->st_mtime)
 217                         sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime);
 218                 else
 219                         sz = strftime(tbuf, sizeof tbuf, "%b %e  %Y", ltime);
 220         }
 221         if (sz == 0)
 222                 tbuf[0] = '\0';
 223         ulen = MAX(strlen(user), 8);
 224         glen = MAX(strlen(group), 8);
 225         if (si_units) {
 226                 fmt_scaled((long long)st->st_size, sbuf);
 227                 snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8s %s %s", mode,
 228                     (u_int)st->st_nlink, ulen, user, glen, group,
 229                     sbuf, tbuf, name);
 230         } else {
 231                 snprintf(buf, sizeof buf, "%s %3u %-*s %-*s %8llu %s %s", mode,
 232                     (u_int)st->st_nlink, ulen, user, glen, group,
 233                     (unsigned long long)st->st_size, tbuf, name);
 234         }
 235         return xstrdup(buf);
 236 }