sftp-common.c revision 1.32
1/* $OpenBSD: sftp-common.c,v 1.32 2020/10/18 11:32:02 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 <sys/types.h> 28#include <sys/stat.h> 29 30#include <grp.h> 31#include <pwd.h> 32#include <stdio.h> 33#include <string.h> 34#include <time.h> 35#include <stdarg.h> 36#include <stdlib.h> 37#include <util.h> 38 39#include "xmalloc.h" 40#include "ssherr.h" 41#include "sshbuf.h" 42#include "log.h" 43#include "misc.h" 44 45#include "sftp.h" 46#include "sftp-common.h" 47 48/* Clear contents of attributes structure */ 49void 50attrib_clear(Attrib *a) 51{ 52 a->flags = 0; 53 a->size = 0; 54 a->uid = 0; 55 a->gid = 0; 56 a->perm = 0; 57 a->atime = 0; 58 a->mtime = 0; 59} 60 61/* Convert from struct stat to filexfer attribs */ 62void 63stat_to_attrib(const struct stat *st, Attrib *a) 64{ 65 attrib_clear(a); 66 a->flags = 0; 67 a->flags |= SSH2_FILEXFER_ATTR_SIZE; 68 a->size = st->st_size; 69 a->flags |= SSH2_FILEXFER_ATTR_UIDGID; 70 a->uid = st->st_uid; 71 a->gid = st->st_gid; 72 a->flags |= SSH2_FILEXFER_ATTR_PERMISSIONS; 73 a->perm = st->st_mode; 74 a->flags |= SSH2_FILEXFER_ATTR_ACMODTIME; 75 a->atime = st->st_atime; 76 a->mtime = st->st_mtime; 77} 78 79/* Convert from filexfer attribs to struct stat */ 80void 81attrib_to_stat(const Attrib *a, struct stat *st) 82{ 83 memset(st, 0, sizeof(*st)); 84 85 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) 86 st->st_size = a->size; 87 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 88 st->st_uid = a->uid; 89 st->st_gid = a->gid; 90 } 91 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) 92 st->st_mode = a->perm; 93 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 94 st->st_atime = a->atime; 95 st->st_mtime = a->mtime; 96 } 97} 98 99/* Decode attributes in buffer */ 100int 101decode_attrib(struct sshbuf *b, Attrib *a) 102{ 103 int r; 104 105 attrib_clear(a); 106 if ((r = sshbuf_get_u32(b, &a->flags)) != 0) 107 return r; 108 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 109 if ((r = sshbuf_get_u64(b, &a->size)) != 0) 110 return r; 111 } 112 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 113 if ((r = sshbuf_get_u32(b, &a->uid)) != 0 || 114 (r = sshbuf_get_u32(b, &a->gid)) != 0) 115 return r; 116 } 117 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 118 if ((r = sshbuf_get_u32(b, &a->perm)) != 0) 119 return r; 120 } 121 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 122 if ((r = sshbuf_get_u32(b, &a->atime)) != 0 || 123 (r = sshbuf_get_u32(b, &a->mtime)) != 0) 124 return r; 125 } 126 /* vendor-specific extensions */ 127 if (a->flags & SSH2_FILEXFER_ATTR_EXTENDED) { 128 char *type; 129 u_char *data; 130 size_t dlen; 131 u_int i, count; 132 133 if ((r = sshbuf_get_u32(b, &count)) != 0) 134 return r; 135 for (i = 0; i < count; i++) { 136 if ((r = sshbuf_get_cstring(b, &type, NULL)) != 0 || 137 (r = sshbuf_get_string(b, &data, &dlen)) != 0) 138 return r; 139 debug3("Got file attribute \"%.100s\" len %zu", 140 type, dlen); 141 free(type); 142 free(data); 143 } 144 } 145 return 0; 146} 147 148/* Encode attributes to buffer */ 149int 150encode_attrib(struct sshbuf *b, const Attrib *a) 151{ 152 int r; 153 154 if ((r = sshbuf_put_u32(b, a->flags)) != 0) 155 return r; 156 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { 157 if ((r = sshbuf_put_u64(b, a->size)) != 0) 158 return r; 159 } 160 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { 161 if ((r = sshbuf_put_u32(b, a->uid)) != 0 || 162 (r = sshbuf_put_u32(b, a->gid)) != 0) 163 return r; 164 } 165 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { 166 if ((r = sshbuf_put_u32(b, a->perm)) != 0) 167 return r; 168 } 169 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { 170 if ((r = sshbuf_put_u32(b, a->atime)) != 0 || 171 (r = sshbuf_put_u32(b, a->mtime)) != 0) 172 return r; 173 } 174 return 0; 175} 176 177/* Convert from SSH2_FX_ status to text error message */ 178const char * 179fx2txt(int status) 180{ 181 switch (status) { 182 case SSH2_FX_OK: 183 return("No error"); 184 case SSH2_FX_EOF: 185 return("End of file"); 186 case SSH2_FX_NO_SUCH_FILE: 187 return("No such file or directory"); 188 case SSH2_FX_PERMISSION_DENIED: 189 return("Permission denied"); 190 case SSH2_FX_FAILURE: 191 return("Failure"); 192 case SSH2_FX_BAD_MESSAGE: 193 return("Bad message"); 194 case SSH2_FX_NO_CONNECTION: 195 return("No connection"); 196 case SSH2_FX_CONNECTION_LOST: 197 return("Connection lost"); 198 case SSH2_FX_OP_UNSUPPORTED: 199 return("Operation unsupported"); 200 default: 201 return("Unknown status"); 202 } 203 /* NOTREACHED */ 204} 205 206/* 207 * drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh 208 */ 209char * 210ls_file(const char *name, const struct stat *st, int remote, int si_units) 211{ 212 int ulen, glen, sz = 0; 213 struct tm *ltime = localtime(&st->st_mtime); 214 const char *user, *group; 215 char buf[1024], lc[8], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1]; 216 char sbuf[FMT_SCALED_STRSIZE]; 217 time_t now; 218 219 strmode(st->st_mode, mode); 220 if (remote) { 221 snprintf(ubuf, sizeof ubuf, "%u", (u_int)st->st_uid); 222 user = ubuf; 223 snprintf(gbuf, sizeof gbuf, "%u", (u_int)st->st_gid); 224 group = gbuf; 225 strlcpy(lc, "?", sizeof(lc)); 226 } else { 227 user = user_from_uid(st->st_uid, 0); 228 group = group_from_gid(st->st_gid, 0); 229 snprintf(lc, sizeof(lc), "%u", (u_int)st->st_nlink); 230 } 231 if (ltime != NULL) { 232 now = time(NULL); 233 if (now - (365*24*60*60)/2 < st->st_mtime && 234 now >= st->st_mtime) 235 sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime); 236 else 237 sz = strftime(tbuf, sizeof tbuf, "%b %e %Y", ltime); 238 } 239 if (sz == 0) 240 tbuf[0] = '\0'; 241 ulen = MAXIMUM(strlen(user), 8); 242 glen = MAXIMUM(strlen(group), 8); 243 if (si_units) { 244 fmt_scaled((long long)st->st_size, sbuf); 245 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8s %s %s", 246 mode, lc, ulen, user, glen, group, 247 sbuf, tbuf, name); 248 } else { 249 snprintf(buf, sizeof buf, "%s %3s %-*s %-*s %8llu %s %s", 250 mode, lc, ulen, user, glen, group, 251 (unsigned long long)st->st_size, tbuf, name); 252 } 253 return xstrdup(buf); 254} 255