1 /* $OpenBSD: sftp-common.c,v 1.30 2017/06/10 06:36:46 djm 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 32 #include <grp.h> 33 #include <pwd.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <time.h> 38 #include <stdarg.h> 39 #ifdef HAVE_UTIL_H 40 #include <util.h> 41 #endif 42 43 #include "xmalloc.h" 44 #include "ssherr.h" 45 #include "sshbuf.h" 46 #include "log.h" 47 #include "misc.h" 48 49 #include "sftp.h" 50 #include "sftp-common.h" 51 52 /* Clear contents of attributes structure */ 53 void 54 attrib_clear(Attrib *a) 55 { 56 a->flags = 0; 57 a->size = 0; 58 a->uid = 0; 59 a->gid = 0; 60 a->perm = 0; 61 a->atime = 0; 62 a->mtime = 0; 63 } 64 65 /* Convert from struct stat to filexfer attribs */ 66 void 67 stat_to_attrib(const struct stat *st, Attrib *a) 68 { 69 attrib_clear(a); 70 a->flags = 0; 71 a->flags |= SSH2_FILEXFER_ATTR_SIZE; 72 a->size = st->st_size; 73 a->flags |= SSH2_FILEXFER_ATTR_UIDGID; 74 a->uid = st->st_uid; 75 a->gid = st->st_gid; 76 a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS; 77 a->perm = st->st_mode; 78 a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME; 79 a->atime = st->st_atime; 80 a->mtime = st->st_mtime; 81 } 82 83 /* Convert from filexfer attribs to struct stat */ 84 void 85 attrib_to_stat(const Attrib *a, struct stat *st) 86 { 87 memset(st, 0, sizeof(*st)); 88 89 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) 90 st->st_size = a->size; 91 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 92 st->st_uid = a->uid; 93 st->st_gid = a->gid; 94 } 95 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) 96 st->st_mode = a->perm; 97 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 98 st->st_atime = a->atime; 99 st->st_mtime = a->mtime; 100 } 101 } 102 103 /* Decode attributes in buffer */ 104 int 105 decode_attrib(struct sshbuf *b, Attrib *a) 106 { 107 int r; 108 109 attrib_clear(a); 110 if ((r = sshbuf_get_u32(b, &a->flags)) != 0) 111 return r; 112 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 113 if ((r = sshbuf_get_u64(b, &a->size)) != 0) 114 return r; 115 } 116 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 117 if ((r = sshbuf_get_u32(b, &a->uid)) != 0 || 118 (r = sshbuf_get_u32(b, &a->gid)) != 0) 119 return r; 120 } 121 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 122 if ((r = sshbuf_get_u32(b, &a->perm)) != 0) 123 return r; 124 } 125 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 126 if ((r = sshbuf_get_u32(b, &a->atime)) != 0 || 127 (r = sshbuf_get_u32(b, &a->mtime)) != 0) 128 return r; 129 } 130 /* vendor-specific extensions */ 131 if (a->flags & SSH2_FILEXFER_ATTR_EXTENDED) { 132 char *type; 133 u_char *data; 134 size_t dlen; 135 u_int i, count; 136 137 if ((r = sshbuf_get_u32(b, &count)) != 0) 138 fatal("%s: buffer error: %s", __func__, ssh_err(r)); 139 for (i = 0; i < count; i++) { 140 if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 141 (r = sshbuf_get_string(b, &data, &dlen)) != 0) 142 return r; 143 debug3("Got file attribute \"%.100s\" len %zu", 144 type, dlen); 145 free(type); 146 free(data); 147 } 148 } 149 return 0; 150 } 151 152 /* Encode attributes to buffer */ 153 int 154 encode_attrib(struct sshbuf *b, const Attrib *a) 155 { 156 int r; 157 158 if ((r = sshbuf_put_u32(b, a->flags)) != 0) 159 return r; 160 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 161 if ((r = sshbuf_put_u64(b, a->size)) != 0) 162 return r; 163 } 164 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 165 if ((r = sshbuf_put_u32(b, a->uid)) != 0 || 166 (r = sshbuf_put_u32(b, a->gid)) != 0) 167 return r; 168 } 169 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 170 if ((r = sshbuf_put_u32(b, a->perm)) != 0) 171 return r; 172 } 173 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 174 if ((r = sshbuf_put_u32(b, a->atime)) != 0 || 175 (r = sshbuf_put_u32(b, a->mtime)) != 0) 176 return r; 177 } 178 return 0; 179 } 180 181 /* Convert from SSH2_FX_ status to text error message */ 182 const char * 183 fx2txt(int status) 184 { 185 switch (status) { 186 case SSH2_FX_OK: 187 return("No error"); 188 case SSH2_FX_EOF: 189 return("End of file"); 190 case SSH2_FX_NO_SUCH_FILE: 191 return("No such file or directory"); 192 case SSH2_FX_PERMISSION_DENIED: 193 return("Permission denied"); 194 case SSH2_FX_FAILURE: 195 return("Failure"); 196 case SSH2_FX_BAD_MESSAGE: 197 return("Bad message"); 198 case SSH2_FX_NO_CONNECTION: 199 return("No connection"); 200 case SSH2_FX_CONNECTION_LOST: 201 return("Connection lost"); 202 case SSH2_FX_OP_UNSUPPORTED: 203 return("Operation unsupported"); 204 default: 205 return("Unknown status"); 206 } 207 /* NOTREACHED */ 208 } 209 210 /* 211 * drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh 212 */ 213 char * 214 ls_file(const char *name, const struct stat *st, int remote, int si_units) 215 { 216 int ulen, glen, sz = 0; 217 struct tm *ltime = localtime(&st->st_mtime); 218 char *user, *group; 219 char buf[1024], lc[8], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1]; 220 char sbuf[FMT_SCALED_STRSIZE]; 221 time_t now; 222 223 strmode(st->st_mode, mode); 224 if (remote) { 225 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid); 226 user = ubuf; 227 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid); 228 group = gbuf; 229 strlcpy(lc, "?", sizeof(lc)); 230 } else { 231 user = user_from_uid(st->st_uid, 0); 232 group = group_from_gid(st->st_gid, 0); 233 snprintf(lc, sizeof(lc), "%u", (u_int)st->st_nlink); 234 } 235 if (ltime != NULL) { 236 now = time(NULL); 237 if (now - (365*24*60*60)/2 < st->st_mtime && 238 now >= st->st_mtime) 239 sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime); 240 else 241 sz = strftime(tbuf, sizeof tbuf, "%b %e %Y", ltime); 242 } 243 if (sz == 0) 244 tbuf[0] = '\0'; 245 ulen = MAXIMUM(strlen(user), 8); 246 glen = MAXIMUM(strlen(group), 8); 247 if (si_units) { 248 fmt_scaled((long long)st->st_size, sbuf); 249 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8s %s %s", 250 mode, lc, ulen, user, glen, group, 251 sbuf, tbuf, name); 252 } else { 253 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8llu %s %s", 254 mode, lc, ulen, user, glen, group, 255 (unsigned long long)st->st_size, tbuf, name); 256 } 257 return xstrdup(buf); 258 } 259