libcli/nbt/lmhosts.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    manipulate nbt name structures
   5
   6    Copyright (C) Andrew Tridgell 1994-1998
   7    Copyright (C) Jeremy Allison 2007
   8    Copyright (C) Andrew Bartlett 2009.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/util/xfile.h"
  26 #include "system/filesys.h"
  27 #include "system/network.h"
  28
  29 /********************************************************
  30  Start parsing the lmhosts file.
  31 *********************************************************/
  32
  33 XFILE *startlmhosts(const char *fname)
  34 {
  35         XFILE *fp = x_fopen(fname,O_RDONLY, 0);
  36         if (!fp) {
  37                 DEBUG(4,("startlmhosts: Can't open lmhosts file %s. "
  38                         "Error was %s\n",
  39                         fname, strerror(errno)));
  40                 return NULL;
  41         }
  42         return fp;
  43 }
  44
  45 /********************************************************
  46  Parse the next line in the lmhosts file.
  47 *********************************************************/
  48
  49 bool getlmhostsent(TALLOC_CTX *ctx, XFILE *fp, char **pp_name, int *name_type,
  50                 struct sockaddr_storage *pss)
  51 {
  52         char line[1024];
  53
  54         *pp_name = NULL;
  55
  56         while(!x_feof(fp) && !x_ferror(fp)) {
  57                 char *ip = NULL;
  58                 char *flags = NULL;
  59                 char *extra = NULL;
  60                 char *name = NULL;
  61                 const char *ptr;
  62                 char *ptr1 = NULL;
  63                 int count = 0;
  64
  65                 *name_type = -1;
  66
  67                 if (!fgets_slash(line,sizeof(line),fp)) {
  68                         continue;
  69                 }
  70
  71                 if (*line == '#') {
  72                         continue;
  73                 }
  74
  75                 ptr = line;
  76
  77                 if (next_token_talloc(ctx, &ptr, &ip, NULL))
  78                         ++count;
  79                 if (next_token_talloc(ctx, &ptr, &name, NULL))
  80                         ++count;
  81                 if (next_token_talloc(ctx, &ptr, &flags, NULL))
  82                         ++count;
  83                 if (next_token_talloc(ctx, &ptr, &extra, NULL))
  84                         ++count;
  85
  86                 if (count <= 0)
  87                         continue;
  88
  89                 if (count > 0 && count < 2) {
  90                         DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",
  91                                                 line));
  92                         continue;
  93                 }
  94
  95                 if (count >= 4) {
  96                         DEBUG(0,("getlmhostsent: too many columns "
  97                                 "in lmhosts file (obsolete syntax)\n"));
  98                         continue;
  99                 }
 100
 101                 if (!flags) {
 102                         flags = talloc_strdup(ctx, "");
 103                         if (!flags) {
 104                                 continue;
 105                         }
 106                 }
 107
 108                 DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n",
 109                                         ip, name, flags));
 110
 111                 if (strchr_m(flags,'G') || strchr_m(flags,'S')) {
 112                         DEBUG(0,("getlmhostsent: group flag "
 113                                 "in lmhosts ignored (obsolete)\n"));
 114                         continue;
 115                 }
 116
 117                 if (!interpret_string_addr(pss, ip, AI_NUMERICHOST)) {
 118                         DEBUG(0,("getlmhostsent: invalid address "
 119                                 "%s.\n", ip));
 120                 }
 121
 122                 /* Extra feature. If the name ends in '#XX',
 123                  * where XX is a hex number, then only add that name type. */
 124                 if((ptr1 = strchr_m(name, '#')) != NULL) {
 125                         char *endptr;
 126                         ptr1++;
 127
 128                         *name_type = (int)strtol(ptr1, &endptr, 16);
 129                         if(!*ptr1 || (endptr == ptr1)) {
 130                                 DEBUG(0,("getlmhostsent: invalid name "
 131                                         "%s containing '#'.\n", name));
 132                                 continue;
 133                         }
 134
 135                         *(--ptr1) = '\0'; /* Truncate at the '#' */
 136                 }
 137
 138                 *pp_name = talloc_strdup(ctx, name);
 139                 if (!*pp_name) {
 140                         return false;
 141                 }
 142                 return true;
 143         }
 144
 145         return false;
 146 }
 147
 148 /********************************************************
 149  Finish parsing the lmhosts file.
 150 *********************************************************/
 151
 152 void endlmhosts(XFILE *fp)
 153 {
 154         x_fclose(fp);
 155 }
 156