source/libsmb/clidgram.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    client dgram calls
   4    Copyright (C) Andrew Tridgell 1994-1998
   5    Copyright (C) Richard Sharpe 2001
   6    Copyright (C) John Terpstra 2001
   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
  24 /*
  25  * cli_send_mailslot, send a mailslot for client code ...
  26  */
  27
  28 bool cli_send_mailslot(struct messaging_context *msg_ctx,
  29                        bool unique, const char *mailslot,
  30                        uint16 priority,
  31                        char *buf, int len,
  32                        const char *srcname, int src_type,
  33                        const char *dstname, int dest_type,
  34                        const struct sockaddr_storage *dest_ss)
  35 {
  36         struct packet_struct p;
  37         struct dgram_packet *dgram = &p.packet.dgram;
  38         char *ptr, *p2;
  39         char tmp[4];
  40         pid_t nmbd_pid;
  41         char addr[INET6_ADDRSTRLEN];
  42
  43         if ((nmbd_pid = pidfile_pid("nmbd")) == 0) {
  44                 DEBUG(3, ("No nmbd found\n"));
  45                 return False;
  46         }
  47
  48         if (dest_ss->ss_family != AF_INET) {
  49                 DEBUG(3, ("cli_send_mailslot: can't send to IPv6 address.\n"));
  50                 return false;
  51         }
  52
  53         memset((char *)&p, '\0', sizeof(p));
  54
  55         /*
  56          * Next, build the DGRAM ...
  57          */
  58
  59         /* DIRECT GROUP or UNIQUE datagram. */
  60         dgram->header.msg_type = unique ? 0x10 : 0x11;
  61         dgram->header.flags.node_type = M_NODE;
  62         dgram->header.flags.first = True;
  63         dgram->header.flags.more = False;
  64         dgram->header.dgm_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) +
  65                 ((unsigned)sys_getpid()%(unsigned)100);
  66         /* source ip is filled by nmbd */
  67         dgram->header.dgm_length = 0; /* Let build_dgram() handle this. */
  68         dgram->header.packet_offset = 0;
  69
  70         make_nmb_name(&dgram->source_name,srcname,src_type);
  71         make_nmb_name(&dgram->dest_name,dstname,dest_type);
  72
  73         ptr = &dgram->data[0];
  74
  75         /* Setup the smb part. */
  76         ptr -= 4; /* XXX Ugliness because of handling of tcp SMB length. */
  77         memcpy(tmp,ptr,4);
  78
  79         if (smb_size + 17*2 + strlen(mailslot) + 1 + len > MAX_DGRAM_SIZE) {
  80                 DEBUG(0, ("cli_send_mailslot: Cannot write beyond end of packet\n"));
  81                 return False;
  82         }
  83
  84         cli_set_message(ptr,17,strlen(mailslot) + 1 + len,True);
  85         memcpy(ptr,tmp,4);
  86
  87         SCVAL(ptr,smb_com,SMBtrans);
  88         SSVAL(ptr,smb_vwv1,len);
  89         SSVAL(ptr,smb_vwv11,len);
  90         SSVAL(ptr,smb_vwv12,70 + strlen(mailslot));
  91         SSVAL(ptr,smb_vwv13,3);
  92         SSVAL(ptr,smb_vwv14,1);
  93         SSVAL(ptr,smb_vwv15,priority);
  94         SSVAL(ptr,smb_vwv16,2);
  95         p2 = smb_buf(ptr);
  96         fstrcpy(p2,mailslot);
  97         p2 = skip_string(ptr,MAX_DGRAM_SIZE,p2);
  98         if (!p2) {
  99                 return False;
 100         }
 101
 102         memcpy(p2,buf,len);
 103         p2 += len;
 104
 105         dgram->datasize = PTR_DIFF(p2,ptr+4); /* +4 for tcp length. */
 106
 107         p.packet_type = DGRAM_PACKET;
 108         p.ip = ((const struct sockaddr_in *)dest_ss)->sin_addr;
 109         p.timestamp = time(NULL);
 110
 111         DEBUG(4,("send_mailslot: Sending to mailslot %s from %s ",
 112                  mailslot, nmb_namestr(&dgram->source_name)));
 113         print_sockaddr(addr, sizeof(addr), dest_ss);
 114
 115         DEBUGADD(4,("to %s IP %s\n", nmb_namestr(&dgram->dest_name), addr));
 116
 117         return NT_STATUS_IS_OK(messaging_send_buf(msg_ctx,
 118                                                   pid_to_procid(nmbd_pid),
 119                                                   MSG_SEND_PACKET,
 120                                                   (uint8 *)&p, sizeof(p)));
 121 }
 122
 123 static const char *mailslot_name(TALLOC_CTX *mem_ctx, struct in_addr dc_ip)
 124 {
 125         return talloc_asprintf(mem_ctx, "%s%X",
 126                                NBT_MAILSLOT_GETDC, dc_ip.s_addr);
 127 }
 128
 129 bool send_getdc_request(TALLOC_CTX *mem_ctx,
 130                         struct messaging_context *msg_ctx,
 131                         struct sockaddr_storage *dc_ss,
 132                         const char *domain_name,
 133                         const DOM_SID *sid)
 134 {
 135         struct in_addr dc_ip;
 136         const char *my_acct_name = NULL;
 137         const char *my_mailslot = NULL;
 138         struct nbt_ntlogon_packet packet;
 139         struct nbt_ntlogon_sam_logon *s;
 140         enum ndr_err_code ndr_err;
 141         DATA_BLOB blob;
 142         struct dom_sid my_sid;
 143
 144         ZERO_STRUCT(packet);
 145         ZERO_STRUCT(my_sid);
 146
 147         if (dc_ss->ss_family != AF_INET) {
 148                 return false;
 149         }
 150
 151         if (sid) {
 152                 my_sid = *sid;
 153         }
 154
 155         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 156         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 157         if (!my_mailslot) {
 158                 return false;
 159         }
 160
 161         my_acct_name = talloc_asprintf(mem_ctx, "%s$", global_myname());
 162         if (!my_acct_name) {
 163                 return false;
 164         }
 165
 166         packet.command  = NTLOGON_SAM_LOGON;
 167         s               = &packet.req.logon;
 168
 169         s->request_count        = 0;
 170         s->computer_name        = global_myname();
 171         s->user_name            = my_acct_name;
 172         s->mailslot_name        = my_mailslot;
 173         s->acct_control         = ACB_WSTRUST;
 174         s->sid                  = my_sid;
 175         s->nt_version           = 1;
 176         s->lmnt_token           = 0xffff;
 177         s->lm20_token           = 0xffff;
 178
 179         if (DEBUGLEVEL >= 10) {
 180                 NDR_PRINT_DEBUG(nbt_ntlogon_packet, &packet);
 181         }
 182
 183         ndr_err = ndr_push_struct_blob(&blob, mem_ctx, &packet,
 184                        (ndr_push_flags_fn_t)ndr_push_nbt_ntlogon_packet);
 185         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 186                 return false;
 187         }
 188
 189         return cli_send_mailslot(msg_ctx,
 190                                  false, NBT_MAILSLOT_NTLOGON, 0,
 191                                  (char *)blob.data, blob.length,
 192                                  global_myname(), 0, domain_name, 0x1c,
 193                                  dc_ss);
 194 }
 195
 196 bool receive_getdc_response(TALLOC_CTX *mem_ctx,
 197                             struct sockaddr_storage *dc_ss,
 198                             const char *domain_name,
 199                             const char **dc_name)
 200 {
 201         struct packet_struct *packet;
 202         const char *my_mailslot = NULL;
 203         struct in_addr dc_ip;
 204         DATA_BLOB blob;
 205         struct nbt_ntlogon_packet r;
 206         union dgram_message_body p;
 207         enum ndr_err_code ndr_err;
 208
 209         if (dc_ss->ss_family != AF_INET) {
 210                 return false;
 211         }
 212
 213         dc_ip = ((struct sockaddr_in *)dc_ss)->sin_addr;
 214
 215         my_mailslot = mailslot_name(mem_ctx, dc_ip);
 216         if (!my_mailslot) {
 217                 return false;
 218         }
 219
 220         packet = receive_unexpected(DGRAM_PACKET, 0, my_mailslot);
 221
 222         if (packet == NULL) {
 223                 DEBUG(5, ("Did not receive packet for %s\n", my_mailslot));
 224                 return False;
 225         }
 226
 227         DEBUG(5, ("Received packet for %s\n", my_mailslot));
 228
 229         blob = data_blob_const(packet->packet.dgram.data,
 230                                packet->packet.dgram.datasize);
 231
 232         if (blob.length < 4) {
 233                 DEBUG(0,("invalid length: %d\n", (int)blob.length));
 234                 return false;
 235         }
 236
 237         if (RIVAL(blob.data,0) != DGRAM_SMB) {
 238                 DEBUG(0,("invalid packet\n"));
 239                 return false;
 240         }
 241
 242         blob.data += 4;
 243         blob.length -= 4;
 244
 245         ndr_err = ndr_pull_union_blob_all(&blob, mem_ctx, &p, DGRAM_SMB,
 246                        (ndr_pull_flags_fn_t)ndr_pull_dgram_smb_packet);
 247         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 248                 DEBUG(0,("failed to parse packet\n"));
 249                 return false;
 250         }
 251
 252         if (p.smb.smb_command != SMB_TRANSACTION) {
 253                 DEBUG(0,("invalid smb_command: %d\n", p.smb.smb_command));
 254                 return false;
 255         }
 256
 257         blob = p.smb.body.trans.data;
 258
 259         ndr_err = ndr_pull_struct_blob(&blob, mem_ctx, &r,
 260                        (ndr_pull_flags_fn_t)ndr_pull_nbt_ntlogon_packet);
 261         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 262                 DEBUG(0,("failed to parse packet\n"));
 263                 return false;
 264         }
 265
 266         if (DEBUGLEVEL >= 10) {
 267                 NDR_PRINT_DEBUG(nbt_ntlogon_packet, &r);
 268         }
 269
 270         if (!strequal(r.req.reply.domain, domain_name)) {
 271                 DEBUG(3, ("GetDC: Expected domain %s, got %s\n",
 272                           domain_name, r.req.reply.domain));
 273                 return false;
 274         }
 275
 276         *dc_name = talloc_strdup(mem_ctx, r.req.reply.server);
 277         if (!*dc_name) {
 278                 return false;
 279         }
 280
 281         if (**dc_name == '\\')  *dc_name += 1;
 282         if (**dc_name == '\\')  *dc_name += 1;
 283
 284         DEBUG(10, ("GetDC gave name %s for domain %s\n",
 285                    *dc_name, r.req.reply.domain));
 286
 287         return True;
 288 }
 289