librpc/ndr/ndr_dnsp.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Manually parsed structures found in DNSP
   5
   6    Copyright (C) Andrew Tridgell 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "librpc/gen_ndr/ndr_dnsp.h"
  24
  25 /*
  26   print a dnsp_name
  27 */
  28 _PUBLIC_ void ndr_print_dnsp_name(struct ndr_print *ndr, const char *name,
  29                                   const char *dns_name)
  30 {
  31         ndr->print(ndr, "%-25s: %s", name, dns_name);
  32 }
  33
  34 /*
  35   pull a dnsp_name
  36 */
  37 _PUBLIC_ enum ndr_err_code ndr_pull_dnsp_name(struct ndr_pull *ndr, int ndr_flags, const char **name)
  38 {
  39         uint8_t len, count, termination;
  40         int i;
  41         uint32_t total_len, raw_offset;
  42         char *ret;
  43
  44         NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &len));
  45         NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &count));
  46
  47         raw_offset = ndr->offset;
  48
  49         ret = talloc_strdup(ndr->current_mem_ctx, "");
  50         if (!ret) {
  51                 return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
  52         }
  53         total_len = 1;
  54
  55         for (i=0; i<count; i++) {
  56                 uint8_t sublen, newlen;
  57                 NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &sublen));
  58                 newlen = total_len + sublen;
  59                 if (i != count-1) {
  60                         newlen++; /* for the '.' */
  61                 }
  62                 ret = talloc_realloc(ndr->current_mem_ctx, ret, char, newlen);
  63                 if (!ret) {
  64                         return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
  65                 }
  66                 NDR_CHECK(ndr_pull_bytes(ndr, (uint8_t *)&ret[total_len-1], sublen));
  67                 if (i != count-1) {
  68                         ret[newlen-2] = '.';
  69                 }
  70                 ret[newlen-1] = 0;
  71                 total_len = newlen;
  72         }
  73         NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &termination));
  74         if (termination != 0) {
  75                 return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp - not NUL terminated");
  76         }
  77         if (ndr->offset > raw_offset + len) {
  78                 return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp - overrun by %u bytes",
  79                                       ndr->offset - (raw_offset + len));
  80         }
  81         /* there could be additional pad bytes */
  82         while (ndr->offset < raw_offset + len) {
  83                 uint8_t pad;
  84                 NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &pad));
  85         }
  86         (*name) = ret;
  87         return NDR_ERR_SUCCESS;
  88 }
  89
  90 enum ndr_err_code ndr_push_dnsp_name(struct ndr_push *ndr, int ndr_flags, const char *name)
  91 {
  92         int count, total_len, i;
  93
  94         /* count the dots */
  95         for (count=i=0; name[i]; i++) {
  96                 if (name[i] == '.') count++;
  97         }
  98         total_len = strlen(name) + 1;
  99
 100         /* cope with names ending in '.' */
 101         if (name[strlen(name)-1] != '.') {
 102                 total_len++;
 103                 count++;
 104         }
 105         if (total_len > 255 || count > 255) {
 106                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
 107                                       "dns_name of length %d larger than 255", total_len);
 108         }
 109         NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)total_len));
 110         NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)count));
 111         for (i=0; i<count; i++) {
 112                 const char *p = strchr(name, '.');
 113                 size_t sublen = p?(p-name):strlen(name);
 114                 NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)sublen));
 115                 NDR_CHECK(ndr_push_bytes(ndr, (const uint8_t *)name, sublen));
 116                 name += sublen + 1;
 117         }
 118         NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, 0));
 119
 120         return NDR_ERR_SUCCESS;
 121 }
 122
 123 /*
 124   print a dnsp_string
 125 */
 126 _PUBLIC_ void ndr_print_dnsp_string(struct ndr_print *ndr, const char *name,
 127                                     const char *dns_string)
 128 {
 129         ndr->print(ndr, "%-25s: %s", name, dns_string);
 130 }
 131
 132 /*
 133   pull a dnsp_string
 134 */
 135 _PUBLIC_ enum ndr_err_code ndr_pull_dnsp_string(struct ndr_pull *ndr, int ndr_flags, const char **string)
 136 {
 137         uint8_t len;
 138         uint32_t total_len;
 139         char *ret;
 140
 141         NDR_CHECK(ndr_pull_uint8(ndr, ndr_flags, &len));
 142
 143         ret = talloc_strdup(ndr->current_mem_ctx, "");
 144         if (!ret) {
 145                 return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
 146         }
 147         total_len = 1;
 148         ret = talloc_zero_array(ndr->current_mem_ctx, char, len+1);
 149         if (!ret) {
 150                 return ndr_pull_error(ndr, NDR_ERR_ALLOC, "Failed to pull dnsp");
 151         }
 152         NDR_CHECK(ndr_pull_bytes(ndr, (uint8_t *)&ret[total_len-1], len));
 153         total_len = len;
 154
 155         (*string) = ret;
 156         NDR_PULL_ALIGN(ndr, 1);
 157         return NDR_ERR_SUCCESS;
 158 }
 159
 160 enum ndr_err_code ndr_push_dnsp_string(struct ndr_push *ndr, int ndr_flags, const char *string)
 161 {
 162         int total_len;
 163         total_len = strlen(string) + 1;
 164         if (total_len > 255) {
 165                 return ndr_push_error(ndr, NDR_ERR_BUFSIZE,
 166                                       "dns_name of length %d larger than 255", total_len);
 167         }
 168         NDR_CHECK(ndr_push_uint8(ndr, ndr_flags, (uint8_t)total_len));
 169         NDR_CHECK(ndr_push_bytes(ndr, (const uint8_t *)string, total_len - 1));
 170         NDR_PUSH_ALIGN(ndr, 1);
 171
 172         return NDR_ERR_SUCCESS;
 173 }