crypto/openssh/sftp-glob.c

   1 /* $OpenBSD: sftp-glob.c,v 1.33 2023/09/10 23:12:32 djm Exp $ */
   2 /*
   3  * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include "includes.h"
  19
  20 #include <sys/types.h>
  21 #ifdef HAVE_SYS_STAT_H
  22 # include <sys/stat.h>
  23 #endif
  24
  25 #include <dirent.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <stdarg.h>
  29
  30 #include "xmalloc.h"
  31 #include "sftp.h"
  32 #include "sftp-common.h"
  33 #include "sftp-client.h"
  34
  35 int sftp_glob(struct sftp_conn *, const char *, int,
  36     int (*)(const char *, int), glob_t *);
  37
  38 struct SFTP_OPENDIR {
  39         SFTP_DIRENT **dir;
  40         int offset;
  41 };
  42
  43 static struct {
  44         struct sftp_conn *conn;
  45 } cur;
  46
  47 static void *
  48 fudge_opendir(const char *path)
  49 {
  50         struct SFTP_OPENDIR *r;
  51
  52         r = xcalloc(1, sizeof(*r));
  53
  54         if (sftp_readdir(cur.conn, path, &r->dir)) {
  55                 free(r);
  56                 return(NULL);
  57         }
  58
  59         r->offset = 0;
  60
  61         return((void *)r);
  62 }
  63
  64 static struct dirent *
  65 fudge_readdir(struct SFTP_OPENDIR *od)
  66 {
  67         /* Solaris needs sizeof(dirent) + path length (see below) */
  68         static char buf[sizeof(struct dirent) + MAXPATHLEN];
  69         struct dirent *ret = (struct dirent *)buf;
  70 #ifdef __GNU_LIBRARY__
  71         static int inum = 1;
  72 #endif /* __GNU_LIBRARY__ */
  73
  74         if (od->dir[od->offset] == NULL)
  75                 return(NULL);
  76
  77         memset(buf, 0, sizeof(buf));
  78
  79         /*
  80          * Solaris defines dirent->d_name as a one byte array and expects
  81          * you to hack around it.
  82          */
  83 #ifdef BROKEN_ONE_BYTE_DIRENT_D_NAME
  84         strlcpy(ret->d_name, od->dir[od->offset++]->filename, MAXPATHLEN);
  85 #else
  86         strlcpy(ret->d_name, od->dir[od->offset++]->filename,
  87             sizeof(ret->d_name));
  88 #endif
  89 #ifdef __GNU_LIBRARY__
  90         /*
  91          * Idiot glibc uses extensions to struct dirent for readdir with
  92          * ALTDIRFUNCs. Not that this is documented anywhere but the
  93          * source... Fake an inode number to appease it.
  94          */
  95         ret->d_ino = inum++;
  96         if (!inum)
  97                 inum = 1;
  98 #endif /* __GNU_LIBRARY__ */
  99
 100         return(ret);
 101 }
 102
 103 static void
 104 fudge_closedir(struct SFTP_OPENDIR *od)
 105 {
 106         sftp_free_dirents(od->dir);
 107         free(od);
 108 }
 109
 110 static int
 111 fudge_lstat(const char *path, struct stat *st)
 112 {
 113         Attrib a;
 114
 115         if (sftp_lstat(cur.conn, path, 1, &a) != 0)
 116                 return -1;
 117
 118         attrib_to_stat(&a, st);
 119
 120         return 0;
 121 }
 122
 123 static int
 124 fudge_stat(const char *path, struct stat *st)
 125 {
 126         Attrib a;
 127
 128         if (sftp_stat(cur.conn, path, 1, &a) != 0)
 129                 return -1;
 130
 131         attrib_to_stat(&a, st);
 132
 133         return(0);
 134 }
 135
 136 int
 137 sftp_glob(struct sftp_conn *conn, const char *pattern, int flags,
 138     int (*errfunc)(const char *, int), glob_t *pglob)
 139 {
 140         int r;
 141         size_t l;
 142         char *s;
 143         struct stat sb;
 144
 145         pglob->gl_opendir = fudge_opendir;
 146         pglob->gl_readdir = (struct dirent *(*)(void *))fudge_readdir;
 147         pglob->gl_closedir = (void (*)(void *))fudge_closedir;
 148         pglob->gl_lstat = fudge_lstat;
 149         pglob->gl_stat = fudge_stat;
 150
 151         memset(&cur, 0, sizeof(cur));
 152         cur.conn = conn;
 153
 154         if ((r = glob(pattern, flags | GLOB_ALTDIRFUNC, errfunc, pglob)) != 0)
 155                 return r;
 156         /*
 157          * When both GLOB_NOCHECK and GLOB_MARK are active, a single gl_pathv
 158          * entry has been returned and that entry has not already been marked,
 159          * then check whether it needs a '/' appended as a directory mark.
 160          *
 161          * This ensures that a NOCHECK result is annotated as a directory.
 162          * The glob(3) spec doesn't promise to mark NOCHECK entries, but doing
 163          * it simplifies our callers (sftp/scp) considerably.
 164          *
 165          * XXX doesn't try to handle gl_offs.
 166          */
 167         if ((flags & (GLOB_NOCHECK|GLOB_MARK)) == (GLOB_NOCHECK|GLOB_MARK) &&
 168             pglob->gl_matchc == 0 && pglob->gl_offs == 0 &&
 169             pglob->gl_pathc == 1 && (s = pglob->gl_pathv[0]) != NULL &&
 170             (l = strlen(s)) > 0 && s[l-1] != '/') {
 171                 if (fudge_stat(s, &sb) == 0 && S_ISDIR(sb.st_mode)) {
 172                         /* NOCHECK on a directory; annotate */
 173                         if ((s = realloc(s, l + 2)) != NULL) {
 174                                 memcpy(s + l, "/", 2);
 175                                 pglob->gl_pathv[0] = s;
 176                         }
 177                 }
 178         }
 179         return 0;
 180 }