/* packet-atalk.c * Routines for Appletalk packet disassembly (DDP, currently). * * $Id: packet-atalk.c,v 1.22 1999/11/16 11:42:25 guy Exp $ * * Simon Wilkinson * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #include #include "globals.h" #include "packet.h" #include "packet-atalk.h" static int proto_ddp = -1; static int hf_ddp_hopcount = -1; static int hf_ddp_len = -1; static int hf_ddp_checksum = -1; static int hf_ddp_dst_net = -1; static int hf_ddp_src_net = -1; static int hf_ddp_dst_node = -1; static int hf_ddp_src_node = -1; static int hf_ddp_dst_socket = -1; static int hf_ddp_src_socket = -1; static int hf_ddp_type = -1; static gint ett_ddp = -1; /* P = Padding, H = Hops, L = Len */ #if BYTE_ORDER == BIG_ENDIAN /* PPHHHHLL LLLLLLLL */ # define ddp_hops(x) ( ( x >> 10) & 0x3C ) # define ddp_len(x) ( x & 0x03ff ) #else /* LLLLLLLL PPHHHHLL*/ # define ddp_hops(x) ( x & 0x3C ) # define ddp_len(x) ( ntohs(x) & 0x03ff ) #endif typedef struct _e_ddp { guint16 hops_len; /* combines pad, hops, and len */ guint16 sum,dnet,snet; guint8 dnode,snode; guint8 dport,sport; guint8 type; } e_ddp; #define DDP_RTMPDATA 0x01 #define DDP_NBP 0x02 #define DDP_ATP 0x03 #define DDP_AEP 0x04 #define DDP_RTMPREQ 0x05 #define DDP_ZIP 0x06 #define DDP_ADSP 0x07 #define DDP_HEADER_SIZE 13 gchar * atalk_addr_to_str(const struct atalk_ddp_addr *addrp) { static gchar str[3][14]; static gchar *cur; if (cur == &str[0][0]) { cur = &str[1][0]; } else if (cur == &str[1][0]) { cur = &str[2][0]; } else { cur = &str[0][0]; } sprintf(cur, "%u.%u:%u", addrp->net, addrp->node, addrp->port); return cur; } static const value_string op_vals[] = { {DDP_RTMPDATA, "AppleTalk Routing Table response or data" }, {DDP_NBP, "AppleTalk Name Binding Protocol packet"}, {DDP_ATP, "AppleTalk Transaction Protocol packet"}, {DDP_AEP, "AppleTalk Echo Protocol packet"}, {DDP_RTMPREQ, "AppleTalk Routing Table request"}, {DDP_ZIP, "AppleTalk Zone Information Protocol packet"}, {DDP_ADSP, "AppleTalk Data Stream Protocol"}, {0, NULL} }; void dissect_ddp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { e_ddp ddp; proto_tree *ddp_tree; proto_item *ti; static struct atalk_ddp_addr src, dst; if (!BYTES_ARE_IN_FRAME(offset, DDP_HEADER_SIZE)) { dissect_data(pd, offset, fd, tree); return; } memcpy(&ddp, &pd[offset], sizeof(e_ddp)); ddp.dnet=ntohs(ddp.dnet); ddp.snet=ntohs(ddp.snet); ddp.sum=ntohs(ddp.sum); src.net = ddp.snet; src.node = ddp.snode; src.port = ddp.sport; dst.net = ddp.dnet; dst.node = ddp.dnode; dst.port = ddp.dport; SET_ADDRESS(&pi.net_src, AT_ATALK, sizeof src, (guint8 *)&src); SET_ADDRESS(&pi.src, AT_ATALK, sizeof src, (guint8 *)&src); SET_ADDRESS(&pi.net_dst, AT_ATALK, sizeof dst, (guint8 *)&dst); SET_ADDRESS(&pi.dst, AT_ATALK, sizeof dst, (guint8 *)&dst); if (check_col(fd, COL_PROTOCOL)) col_add_str(fd, COL_PROTOCOL, "DDP"); if (check_col(fd, COL_INFO)) col_add_str(fd, COL_INFO, val_to_str(ddp.type, op_vals, "Unknown DDP protocol (%02x)")); if (tree) { ti = proto_tree_add_item(tree, proto_ddp, offset, DDP_HEADER_SIZE, NULL); ddp_tree = proto_item_add_subtree(ti, ett_ddp); proto_tree_add_item(ddp_tree, hf_ddp_hopcount, offset, 1, ddp_hops(ddp.hops_len)); proto_tree_add_item(ddp_tree, hf_ddp_len, offset, 2, ddp_len(ddp.hops_len)); proto_tree_add_item(ddp_tree, hf_ddp_checksum, offset + 2, 2, ddp.sum); proto_tree_add_item(ddp_tree, hf_ddp_dst_net, offset + 4, 2, ddp.dnet); proto_tree_add_item(ddp_tree, hf_ddp_src_net, offset + 6, 2, ddp.snet); proto_tree_add_item(ddp_tree, hf_ddp_dst_node, offset + 8, 1, ddp.dnode); proto_tree_add_item(ddp_tree, hf_ddp_src_node, offset + 9, 1, ddp.snode); proto_tree_add_item(ddp_tree, hf_ddp_dst_socket, offset + 10, 1, ddp.dport); proto_tree_add_item(ddp_tree, hf_ddp_src_socket, offset + 11, 1, ddp.sport); proto_tree_add_item(ddp_tree, hf_ddp_type, offset + 12, 1, ddp.type); } offset += DDP_HEADER_SIZE; dissect_data(pd, offset, fd, tree); } void proto_register_atalk(void) { static hf_register_info hf[] = { { &hf_ddp_hopcount, { "Hop count", "ddp.hopcount", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_len, { "Datagram length", "ddp.len", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_checksum, { "Checksum", "ddp.checksum", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_dst_net, { "Destination Net", "ddp.dst.net", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_src_net, { "Source Net", "ddp.src.net", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_dst_node, { "Destination Node", "ddp.dst.node", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_src_node, { "Source Node", "ddp.src.node", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_dst_socket, { "Destination Socket", "ddp.dst.socket", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_src_socket, { "Source Socket", "ddp.src.socket", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_ddp_type, { "Protocol type", "ddp.type", FT_UINT8, BASE_DEC, VALS(op_vals), 0x0, "" }}, }; static gint *ett[] = { &ett_ddp, }; proto_ddp = proto_register_protocol("Datagram Delivery Protocol", "ddp"); proto_register_field_array(proto_ddp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); }