/* packet-pop.c * Routines for pop packet dissection * RFC 1939 * Copyright 1999, Richard Sharpe * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from packet-tftp.c * * 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 #include #include #include #include #include static int proto_pop = -1; static int hf_pop_response = -1; static int hf_pop_response_indicator = -1; static int hf_pop_response_description = -1; static int hf_pop_response_data = -1; static int hf_pop_request = -1; static int hf_pop_request_command = -1; static int hf_pop_request_parameter = -1; static int hf_pop_request_data = -1; static gint ett_pop = -1; static gint ett_pop_reqresp = -1; static dissector_handle_t data_handle; #define TCP_PORT_POP 110 static gboolean response_is_continuation(const guchar *data); static void dissect_pop(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { gboolean is_request; gboolean is_continuation; proto_tree *pop_tree, *reqresp_tree; proto_item *ti; gint offset = 0; const guchar *line; gint next_offset; int linelen; int tokenlen; const guchar *next_token; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "POP"); /* * Find the end of the first line. * * Note that "tvb_find_line_end()" will return a value that is * not longer than what's in the buffer, so the "tvb_get_ptr()" * call won't throw an exception. */ linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE); line = tvb_get_ptr(tvb, offset, linelen); if (pinfo->match_port == pinfo->destport) { is_request = TRUE; is_continuation = FALSE; } else { is_request = FALSE; is_continuation = response_is_continuation(line); } if (check_col(pinfo->cinfo, COL_INFO)) { /* * Put the first line from the buffer into the summary * if it's a POP request or reply (but leave out the * line terminator). * Otherwise, just call it a continuation. */ if (is_continuation) col_set_str(pinfo->cinfo, COL_INFO, "Continuation"); else col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s", is_request ? "Request" : "Response", format_text(line, linelen)); } if (tree) { ti = proto_tree_add_item(tree, proto_pop, tvb, offset, -1, FALSE); pop_tree = proto_item_add_subtree(ti, ett_pop); if (is_continuation) { /* * Put the whole packet into the tree as data. */ call_dissector(data_handle,tvb, pinfo, pop_tree); return; } /* * Put the line into the protocol tree. */ ti = proto_tree_add_string_format(pop_tree, (is_request) ? hf_pop_request : hf_pop_response, tvb, offset, next_offset - offset, "", "%s", tvb_format_text(tvb, offset, next_offset - offset)); reqresp_tree = proto_item_add_subtree(ti, ett_pop_reqresp); /* * Extract the first token, and, if there is a first * token, add it as the request or reply code. */ tokenlen = get_token_len(line, line + linelen, &next_token); if (tokenlen != 0) { proto_tree_add_item(reqresp_tree, (is_request) ? hf_pop_request_command : hf_pop_response_indicator, tvb, offset, tokenlen, FALSE); offset += next_token - line; linelen -= next_token - line; line = next_token; } /* * Add the rest of the first line as request or * reply param/description. */ if (linelen != 0) { proto_tree_add_item(reqresp_tree, (is_request) ? hf_pop_request_parameter : hf_pop_response_description, tvb, offset, linelen, FALSE); } offset = next_offset; /* * Show the rest of the request or response as text, * a line at a time. */ while (tvb_offset_exists(tvb, offset)) { /* * Find the end of the line. */ linelen = tvb_find_line_end(tvb, offset, -1, &next_offset, FALSE); /* * Put this line. */ proto_tree_add_string_format(pop_tree, (is_request) ? hf_pop_request_data : hf_pop_response_data, tvb, offset, next_offset - offset, "", "%s", tvb_format_text(tvb, offset, next_offset - offset)); offset = next_offset; } } } static gboolean response_is_continuation(const guchar *data) { if (strncmp(data, "+OK", strlen("+OK")) == 0) return FALSE; if (strncmp(data, "-ERR", strlen("-ERR")) == 0) return FALSE; return TRUE; } void proto_register_pop(void) { static hf_register_info hf[] = { { &hf_pop_response, { "Response", "pop.response", FT_STRING, BASE_NONE, NULL, 0x0, "Response", HFILL }}, { &hf_pop_response_indicator, { "Response indicator", "pop.response.indicator", FT_STRING, BASE_NONE, NULL, 0x0, "Response indicator", HFILL }}, { &hf_pop_response_description, { "Response description", "pop.response.description", FT_STRING, BASE_NONE, NULL, 0x0, "Response description", HFILL }}, { &hf_pop_response_data, { "Data", "pop.response.data", FT_STRING, BASE_NONE, NULL, 0x0, "Response Data", HFILL }}, { &hf_pop_request, { "Request", "pop.request", FT_STRING, BASE_NONE, NULL, 0x0, "Request", HFILL }}, { &hf_pop_request_command, { "Request command", "pop.request.command", FT_STRING, BASE_NONE, NULL, 0x0, "Request command", HFILL }}, { &hf_pop_request_parameter, { "Request parameter", "pop.request.parameter", FT_STRING, BASE_NONE, NULL, 0x0, "Request parameter", HFILL }}, { &hf_pop_request_data, { "Data", "pop.request.data", FT_STRING, BASE_NONE, NULL, 0x0, "Request data", HFILL }}, }; static gint *ett[] = { &ett_pop, &ett_pop_reqresp, }; proto_pop = proto_register_protocol("Post Office Protocol", "POP", "pop"); register_dissector("pop", dissect_pop, proto_pop); proto_register_field_array(proto_pop, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_pop(void) { dissector_handle_t pop_handle; pop_handle = create_dissector_handle(dissect_pop, proto_pop); dissector_add("tcp.port", TCP_PORT_POP, pop_handle); data_handle = find_dissector("data"); }