* Case insensitive lookup patch for tftp-hpa
*
* Copyright (c) 2006-2007 Gianluigi Tiesi <sherpya@netfarm.it>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this software; if not, write to the
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

diff -ur tftp-hpa-0.40.orig/tftpd/tftpd.c tftp-hpa-0.40/tftpd/tftpd.c
--- tftp-hpa-0.40.orig/tftpd/tftpd.c	2004-09-15 00:38:46.000000000 +0200
+++ tftp-hpa-0.40/tftpd/tftpd.c	2006-02-17 23:41:31.000000000 +0100
@@ -61,6 +61,7 @@
 #include <pwd.h>
 #include <limits.h>
 #include <syslog.h>
+#include <dirent.h>
 
 #include "tftpsubs.h"
 #include "recvfrom.h"
@@ -713,6 +714,9 @@
 void	tftp_sendfile(struct formats *, struct tftphdr *, int);
 void	tftp_recvfile(struct formats *, struct tftphdr *, int);
 
+int lookup_entry(const char *comp, char *dest);
+void lookup_file(char *filename);
+
 struct formats {
   const char *f_mode;
   char	*(*f_rewrite)(char *, int, const char **);
@@ -1049,6 +1053,64 @@
 }
 #endif
 
+
+int lookup_entry(const char *comp, char *dest)
+{
+  DIR *dirp;
+  struct dirent *dptr;
+  dirp = opendir(dest[0] ? dest : ".");
+  if (!dirp) return 0;
+  while ((dptr = readdir(dirp)))
+  {
+    if (!strcasecmp(dptr->d_name, comp))
+    {
+      if (dest[0]) strcat(dest, "/");
+      strcat(dest, dptr->d_name);
+      closedir(dirp);
+      return 1;
+    }
+  }
+  closedir(dirp);
+  return 0;
+}
+
+
+void lookup_file(char *filename)
+{
+  int found = 0;
+  int len = 0;
+  char dest[1024];
+  char comp[1024];
+  char *check = filename;
+  char *seek = NULL;
+
+  dest[0] = 0;
+  check++;
+  while (*check)
+  {
+    seek = strchr(check, '\\');
+    if (!seek)
+    {
+      if ((*check) && (lookup_entry(check, dest)))
+        found = 1;
+      break;
+    }
+    len = seek - check;
+    memcpy(comp, check, len);
+    comp[len]=0;
+    if (!lookup_entry(comp, dest))
+      break;
+    check += len + 1;
+  }
+
+  if (found)
+  {
+    filename[0] = 0;
+    strcat(filename, dest);
+  }
+}
+
+
 FILE *file;
 /*
  * Validate file access.  Since we
@@ -1075,6 +1137,8 @@
   tsize_ok = 0;
   *errmsg = NULL;
   
+  if (*filename == '\\') lookup_file(filename);
+
   if (!secure) {
     if (*filename != '/') {
       *errmsg = "Only absolute filenames allowed";