diff options
Diffstat (limited to 'packet-rtsp.c')
| -rw-r--r-- | packet-rtsp.c | 1217 |
1 files changed, 0 insertions, 1217 deletions
diff --git a/packet-rtsp.c b/packet-rtsp.c deleted file mode 100644 index 1a1453494e..0000000000 --- a/packet-rtsp.c +++ /dev/null @@ -1,1217 +0,0 @@ -/* packet-rtsp.c - * Routines for RTSP packet disassembly (RFC 2326) - * - * Jason Lango <jal@netapp.com> - * Liberally copied from packet-http.c, by Guy Harris <guy@alum.mit.edu> - * - * $Id$ - * - * Ethereal - Network traffic analyzer - * By Gerald Combs <gerald@ethereal.com> - * Copyright 1998 Gerald Combs - * - * 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. - * - * References: - * RTSP is defined in RFC 2326, http://www.ietf.org/rfc/rfc2326.txt?number=2326 - * http://www.iana.org/assignments/rsvp-parameters - */ - -#include "config.h" - -#include <string.h> -#include <ctype.h> -#include <stdlib.h> - -#include "prefs.h" - -#include <glib.h> -#include <epan/packet.h> -#include "req_resp_hdrs.h" -#include "packet-rtp.h" -#include "packet-rtcp.h" -#include <epan/conversation.h> -#include <epan/strutil.h> -#include "packet-e164.h" - -static int proto_rtsp = -1; - -static gint ett_rtsp = -1; -static gint ett_rtspframe = -1; -static gint ett_rtsp_method = -1; - -static int hf_rtsp_method = -1; -static int hf_rtsp_url = -1; -static int hf_rtsp_status = -1; -static int hf_rtsp_session = -1; -static int hf_rtsp_X_Vig_Msisdn = -1; - -static dissector_handle_t sdp_handle; -static dissector_handle_t rtp_handle; -static dissector_handle_t rtcp_handle; - -void proto_reg_handoff_rtsp(void); - -static GMemChunk *rtsp_vals = NULL; -#define rtsp_hash_init_count 20 - -/* - * desegmentation of RTSP headers - * (when we are over TCP or another protocol providing the desegmentation API) - */ -static gboolean rtsp_desegment_headers = FALSE; - -/* - * desegmentation of RTSP bodies - * (when we are over TCP or another protocol providing the desegmentation API) - * TODO let the user filter on content-type the bodies he wants desegmented - */ -static gboolean rtsp_desegment_body = FALSE; - -/* http://www.iana.org/assignments/port-numberslists two rtsp ports */ -#define TCP_PORT_RTSP 554 -#define TCP_ALTERNATE_PORT_RTSP 8554 -static guint global_rtsp_tcp_port = TCP_PORT_RTSP; -static guint global_rtsp_tcp_alternate_port = TCP_ALTERNATE_PORT_RTSP; -/* -* Variables to allow for proper deletion of dissector registration when -* the user changes port from the gui. -*/ -static guint tcp_port = 0; -static guint tcp_alternate_port = 0; - -/* - * Takes an array of bytes, assumed to contain a null-terminated - * string, as an argument, and returns the length of the string - - * i.e., the size of the array, minus 1 for the null terminator. - */ -#define STRLEN_CONST(str) (sizeof (str) - 1) - -#define RTSP_FRAMEHDR ('$') - -typedef struct { - dissector_handle_t dissector; -} rtsp_interleaved_t; - -#define RTSP_MAX_INTERLEAVED (8) - -/* - * Careful about dynamically allocating memory in this structure (say - * for dynamically increasing the size of the 'interleaved' array) - - * the containing structure is garbage collected and contained - * pointers will not be freed. - */ -typedef struct { - rtsp_interleaved_t interleaved[RTSP_MAX_INTERLEAVED]; -} rtsp_conversation_data_t; - -static int -dissect_rtspinterleaved(tvbuff_t *tvb, int offset, packet_info *pinfo, - proto_tree *tree) -{ - guint length_remaining; - proto_item *ti; - proto_tree *rtspframe_tree = NULL; - int orig_offset; - guint8 rf_start; /* always RTSP_FRAMEHDR */ - guint8 rf_chan; /* interleaved channel id */ - guint16 rf_len; /* packet length */ - tvbuff_t *next_tvb; - conversation_t *conv; - rtsp_conversation_data_t *data; - dissector_handle_t dissector; - - /* - * This will throw an exception if we don't have any data left. - * That's what we want. (See "tcp_dissect_pdus()", which is - * similar.) - */ - length_remaining = tvb_ensure_length_remaining(tvb, offset); - - /* - * Can we do reassembly? - */ - if (rtsp_desegment_headers && pinfo->can_desegment) { - /* - * Yes - would an RTSP multiplexed header starting at - * this offset be split across segment boundaries? - */ - if (length_remaining < 4) { - /* - * Yes. Tell the TCP dissector where the data - * for this message starts in the data it handed - * us, and how many more bytes we need, and return. - */ - pinfo->desegment_offset = offset; - pinfo->desegment_len = 4 - length_remaining; - return -1; - } - } - - /* - * Get the "$", channel, and length from the header. - */ - orig_offset = offset; - rf_start = tvb_get_guint8(tvb, offset); - rf_chan = tvb_get_guint8(tvb, offset+1); - rf_len = tvb_get_ntohs(tvb, offset+2); - - /* - * Can we do reassembly? - */ - if (rtsp_desegment_body && pinfo->can_desegment) { - /* - * Yes - is the header + encapsulated packet split - * across segment boundaries? - */ - if (length_remaining < 4U + rf_len) { - /* - * Yes. Tell the TCP dissector where the data - * for this message starts in the data it handed - * us, and how many more bytes we need, and return. - */ - pinfo->desegment_offset = offset; - pinfo->desegment_len = 4U + rf_len - length_remaining; - return -1; - } - } - - if (check_col(pinfo->cinfo, COL_INFO)) - col_add_fstr(pinfo->cinfo, COL_INFO, - "Interleaved channel 0x%02x, %u bytes", - rf_chan, rf_len); - - if (tree != NULL) { - ti = proto_tree_add_protocol_format(tree, proto_rtsp, tvb, - offset, 4, - "RTSP Interleaved Frame, Channel: 0x%02x, %u bytes", - rf_chan, rf_len); - rtspframe_tree = proto_item_add_subtree(ti, ett_rtspframe); - - proto_tree_add_text(rtspframe_tree, tvb, offset, 1, - "Magic: 0x%02x", - rf_start); - } - offset += 1; - - if (tree != NULL) { - proto_tree_add_text(rtspframe_tree, tvb, offset, 1, - "Channel: 0x%02x", - rf_chan); - } - offset += 1; - - if (tree != NULL) { - proto_tree_add_text(rtspframe_tree, tvb, offset, 2, - "Length: %u bytes", - rf_len); - } - offset += 2; - - /* - * We set the actual length of the tvbuff for the interleaved - * stuff to the minimum of what's left in the tvbuff and the - * length in the header. - * - * XXX - what if there's nothing left in the tvbuff? - * We'd want a BoundsError exception to be thrown, so - * that a Short Frame would be reported. - */ - if (length_remaining > rf_len) - length_remaining = rf_len; - next_tvb = tvb_new_subset(tvb, offset, length_remaining, rf_len); - - conv = find_conversation(&pinfo->src, &pinfo->dst, pinfo->ptype, - pinfo->srcport, pinfo->destport, 0); - - if (conv && - (data = conversation_get_proto_data(conv, proto_rtsp)) && - rf_chan < RTSP_MAX_INTERLEAVED && - (dissector = data->interleaved[rf_chan].dissector)) { - call_dissector(dissector, next_tvb, pinfo, tree); - } else { - proto_tree_add_text(rtspframe_tree, tvb, offset, rf_len, - "Data (%u bytes)", rf_len); - } - - offset += rf_len; - - return offset - orig_offset; -} - -static void process_rtsp_request(tvbuff_t *tvb, int offset, const guchar *data, - size_t linelen, proto_tree *tree); - -static void process_rtsp_reply(tvbuff_t *tvb, int offset, const guchar *data, - size_t linelen, proto_tree *tree); - -typedef enum { - RTSP_REQUEST, - RTSP_REPLY, - NOT_RTSP -} rtsp_type_t; - -static const char *rtsp_methods[] = { - "DESCRIBE", - "ANNOUNCE", - "GET_PARAMETER", - "OPTIONS", - "PAUSE", - "PLAY", - "RECORD", - "REDIRECT", - "SETUP", - "SET_PARAMETER", - "TEARDOWN" -}; - -#define RTSP_NMETHODS (sizeof rtsp_methods / sizeof rtsp_methods[0]) - -static gboolean -is_rtsp_request_or_reply(const guchar *line, size_t linelen, rtsp_type_t *type) -{ - unsigned ii; - - /* Is this an RTSP reply? */ - if (linelen >= 5 && strncasecmp("RTSP/", line, 5) == 0) { - /* - * Yes. - */ - *type = RTSP_REPLY; - return TRUE; - } - - /* - * Is this an RTSP request? - * Check whether the line begins with one of the RTSP request - * methods. - */ - for (ii = 0; ii < RTSP_NMETHODS; ii++) { - size_t len = strlen(rtsp_methods[ii]); - if (linelen >= len && - strncasecmp(rtsp_methods[ii], line, len) == 0 && - (len == linelen || isspace(line[len]))) { - *type = RTSP_REQUEST; - return TRUE; - } - } - *type = NOT_RTSP; - return FALSE; -} - -static const char rtsp_content_type[] = "Content-Type:"; - -static int -is_content_sdp(const guchar *line, size_t linelen) -{ - static const char type[] = "application/sdp"; - size_t typelen = STRLEN_CONST(type); - - line += STRLEN_CONST(rtsp_content_type); - linelen -= STRLEN_CONST(rtsp_content_type); - while (linelen > 0 && (*line == ' ' || *line == '\t')) { - line++; - linelen--; - } - - if (linelen < typelen || strncasecmp(type, line, typelen)) - return FALSE; - - line += typelen; - linelen -= typelen; - if (linelen > 0 && !isspace(*line)) - return FALSE; - - return TRUE; -} - -static const char rtsp_transport[] = "Transport:"; -static const char rtsp_sps[] = "server_port="; -static const char rtsp_cps[] = "client_port="; -static const char rtsp_rtp[] = "rtp/"; -static const char rtsp_inter[] = "interleaved="; - -static void -rtsp_create_conversation(packet_info *pinfo, const guchar *line_begin, - size_t line_len) -{ - conversation_t *conv; - guchar buf[256]; - guchar *tmp; - guint c_data_port, c_mon_port; - guint s_data_port, s_mon_port; - address null_addr; - - if (line_len > sizeof(buf) - 1) { - /* - * Don't overflow the buffer. - */ - line_len = sizeof(buf) - 1; - } - memcpy(buf, line_begin, line_len); - buf[line_len] = '\0'; - - tmp = buf + STRLEN_CONST(rtsp_transport); - while (*tmp && isspace(*tmp)) - tmp++; - if (strncasecmp(tmp, rtsp_rtp, strlen(rtsp_rtp)) != 0) { - g_warning("Frame %u: rtsp: unknown transport", pinfo->fd->num); - return; - } - - c_data_port = c_mon_port = 0; - s_data_port = s_mon_port = 0; - if ((tmp = strstr(buf, rtsp_sps))) { - tmp += strlen(rtsp_sps); - if (sscanf(tmp, "%u-%u", &s_data_port, &s_mon_port) < 1) { - g_warning("Frame %u: rtsp: bad server_port", - pinfo->fd->num); - return; - } - } - if ((tmp = strstr(buf, rtsp_cps))) { - tmp += strlen(rtsp_cps); - if (sscanf(tmp, "%u-%u", &c_data_port, &c_mon_port) < 1) { - g_warning("Frame %u: rtsp: bad client_port", - pinfo->fd->num); - return; - } - } - if (!c_data_port) { - rtsp_conversation_data_t *data; - guint s_data_chan, s_mon_chan; - int i; - - /* - * Deal with RTSP TCP-interleaved conversations. - */ - if ((tmp = strstr(buf, rtsp_inter)) == NULL) { - /* - * No interleaved or server_port - probably a - * SETUP request, rather than reply. - */ - return; - } - tmp += strlen(rtsp_inter); - i = sscanf(tmp, "%u-%u", &s_data_chan, &s_mon_chan); - if (i < 1) { - g_warning("Frame %u: rtsp: bad interleaved", - pinfo->fd->num); - return; - } - conv = find_conversation(&pinfo->src, &pinfo->dst, pinfo->ptype, - pinfo->srcport, pinfo->destport, 0); - if (!conv) { - conv = conversation_new(&pinfo->src, &pinfo->dst, - pinfo->ptype, pinfo->srcport, pinfo->destport, - 0); - } - data = conversation_get_proto_data(conv, proto_rtsp); - if (!data) { - data = g_mem_chunk_alloc(rtsp_vals); - conversation_add_proto_data(conv, proto_rtsp, data); - } - if (s_data_chan < RTSP_MAX_INTERLEAVED) { - data->interleaved[s_data_chan].dissector = - rtp_handle; - } - if (i > 1 && s_mon_chan < RTSP_MAX_INTERLEAVED) { - data->interleaved[s_mon_chan].dissector = - rtcp_handle; - } - return; - } - - /* - * We only want to match on the destination address, not the - * source address, because the server might send back a packet - * from an address other than the address to which its client - * sent the packet, so we construct a conversation with no - * second address. - */ - SET_ADDRESS(&null_addr, pinfo->src.type, 0, NULL); - - rtp_add_address(pinfo, (char *)pinfo->dst.data, c_data_port, s_data_port, - "RTSP", pinfo->fd->num); - - if (!c_mon_port) - return; - - rtcp_add_address(pinfo, (char *)pinfo->dst.data, c_mon_port, s_mon_port, - "RTSP", pinfo->fd->num); -} - -static const char rtsp_content_length[] = "Content-Length:"; - -static int -rtsp_get_content_length(const guchar *line_begin, size_t line_len) -{ - guchar buf[256]; - guchar *tmp; - long content_length; - char *p; - guchar *up; - - if (line_len > sizeof(buf) - 1) { - /* - * Don't overflow the buffer. - */ - line_len = sizeof(buf) - 1; - } - memcpy(buf, line_begin, line_len); - buf[line_len] = '\0'; - - tmp = buf + STRLEN_CONST(rtsp_content_length); - while (*tmp && isspace(*tmp)) - tmp++; - content_length = strtol(tmp, &p, 10); - up = p; - if (up == tmp || (*up != '\0' && !isspace(*up))) - return -1; /* not a valid number */ - return content_length; -} - -static const char rtsp_Session[] = "Session:"; -static const char rtsp_X_Vig_Msisdn[] = "X-Vig-Msisdn"; - -static int -dissect_rtspmessage(tvbuff_t *tvb, int offset, packet_info *pinfo, - proto_tree *tree) -{ - proto_tree *rtsp_tree = NULL; - proto_tree *sub_tree = NULL; - proto_item *ti = NULL; - const guchar *line; - gint next_offset; - const guchar *linep, *lineend; - int orig_offset; - int first_linelen, linelen; - int line_end_offset; - int colon_offset; - gboolean is_request_or_reply; - gboolean body_requires_content_len; - gboolean saw_req_resp_or_header; - guchar c; - rtsp_type_t rtsp_type; - gboolean is_header; - int is_sdp = FALSE; - int datalen; - int content_length; - int reported_datalen; - int value_offset; - int value_len; - e164_info_t e164_info; - /* - * Is this a request or response? - * - * 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. - */ - first_linelen = tvb_find_line_end(tvb, offset, - tvb_ensure_length_remaining(tvb, offset), &next_offset, - FALSE); - /* - * Is the first line a request or response? - */ - line = tvb_get_ptr(tvb, offset, first_linelen); - is_request_or_reply = is_rtsp_request_or_reply(line, first_linelen, - &rtsp_type); - if (is_request_or_reply) { - /* - * Yes, it's a request or response. - * Do header desegmentation if we've been told to, - * and do body desegmentation if we've been told to and - * we find a Content-Length header. - */ - if (!req_resp_hdrs_do_reassembly(tvb, pinfo, - rtsp_desegment_headers, rtsp_desegment_body)) { - /* - * More data needed for desegmentation. - */ - return -1; - } - } - - /* - * RFC 2326 says that a content length must be specified - * in requests that have a body, although section 4.4 speaks - * of a server closing the connection indicating the end of - * a reply body. - * - * We assume that an absent content length in a request means - * that we don't have a body, and that an absent content length - * in a reply means that the reply body runs to the end of - * the connection. If the first line is neither, we assume - * that whatever follows a blank line should be treated as a - * body; there's not much else we can do, as we're jumping - * into the message in the middle. - * - * XXX - if there was no Content-Length entity header, we should - * accumulate all data until the end of the connection. - * That'd require that the TCP dissector call subdissectors - * for all frames with FIN, even if they contain no data, - * which would require subdissectors to deal intelligently - * with empty segments. - */ - if (rtsp_type == RTSP_REQUEST) - body_requires_content_len = TRUE; - else - body_requires_content_len = FALSE; - - if (check_col(pinfo->cinfo, COL_PROTOCOL)) - col_set_str(pinfo->cinfo, COL_PROTOCOL, "RTSP"); - if (check_col(pinfo->cinfo, COL_INFO)) { - /* - * Put the first line from the buffer into the summary - * if it's an RTSP request or reply (but leave out the - * line terminator). - * Otherwise, just call it a continuation. - * - * 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. - */ - line = tvb_get_ptr(tvb, offset, first_linelen); - if (is_request_or_reply) - if ( rtsp_type == RTSP_REPLY ) { - col_add_str(pinfo->cinfo, COL_INFO, "Reply: "); - col_append_str(pinfo->cinfo, COL_INFO, - format_text(line, first_linelen)); - } - else - col_add_str(pinfo->cinfo, COL_INFO, - format_text(line, first_linelen)); - - else - col_set_str(pinfo->cinfo, COL_INFO, "Continuation"); - - } - - orig_offset = offset; - if (tree) { - ti = proto_tree_add_item(tree, proto_rtsp, tvb, offset, -1, - FALSE); - rtsp_tree = proto_item_add_subtree(ti, ett_rtsp); - } - - /* - * We haven't yet seen a Content-Length header. - */ - content_length = -1; - - /* - * Process the packet data, a line at a time. - */ - saw_req_resp_or_header = FALSE; /* haven't seen anything yet */ - while (tvb_reported_length_remaining(tvb, offset) != 0) { - /* - * We haven't yet concluded that this is a header. - */ - is_header = FALSE; - - /* - * Find the end of the line. - */ - linelen = tvb_find_line_end(tvb, offset, - tvb_ensure_length_remaining(tvb, offset), &next_offset, - FALSE); - if (linelen < 0) - return -1; - line_end_offset = offset + linelen; - /* - * colon_offset may be -1 - */ - colon_offset = tvb_find_guint8(tvb, offset, linelen, ':'); - - - /* - * Get a buffer that refers to the line. - */ - line = tvb_get_ptr(tvb, offset, linelen); - lineend = line + linelen; - - /* - * OK, does it look like an RTSP request or response? - */ - is_request_or_reply = is_rtsp_request_or_reply(line, linelen, - &rtsp_type); - if (is_request_or_reply) - goto is_rtsp; - - /* - * No. Does it look like a blank line (as would appear - * at the end of an RTSP request)? - */ - if (linelen == 0) - goto is_rtsp; /* Yes. */ - - /* - * No. Does it look like a header? - */ - linep = line; - while (linep < lineend) { - c = *linep++; - - /* - * This must be a CHAR to be part of a token; that - * means it must be ASCII. - */ - if (!isascii(c)) - break; /* not ASCII, thus not a CHAR */ - - /* - * This mustn't be a CTL to be part of a token. - * - * XXX - what about leading LWS on continuation - * lines of a header? - */ - if (iscntrl(c)) - break; /* CTL, not part of a header */ - - switch (c) { - - case '(': - case ')': - case '<': - case '>': - case '@': - case ',': - case ';': - case '\\': - case '"': - case '/': - case '[': - case ']': - case '?': - case '=': - case '{': - case '}': - /* - * It's a tspecial, so it's not - * part of a token, so it's not - * a field name for the beginning - * of a header. - */ - goto not_rtsp; - - case ':': - /* - * This ends the token; we consider - * this to be a header. - */ - is_header = TRUE; - goto is_rtsp; - - case ' ': - case '\t': - /* - * LWS (RFC-2616, 4.2); continue the previous - * header. - */ - goto is_rtsp; - } - } - - /* - * We haven't seen the colon, but everything else looks - * OK for a header line. - * - * If we've already seen an RTSP request or response - * line, or a header line, and we're at the end of - * the tvbuff, we assume this is an incomplete header - * line. (We quit this loop after seeing a blank line, - * so if we've seen a request or response line, or a - * header line, this is probably more of the request - * or response we're presumably seeing. There is some - * risk of false positives, but the same applies for - * full request or response lines or header lines, - * although that's less likely.) - * - * We throw an exception in that case, by checking for - * the existence of the next byte after the last one - * in the line. If it exists, "tvb_ensure_bytes_exist()" - * throws no exception, and we fall through to the - * "not RTSP" case. If it doesn't exist, - * "tvb_ensure_bytes_exist()" will throw the appropriate - * exception. - */ - if (saw_req_resp_or_header) - tvb_ensure_bytes_exist(tvb, offset, linelen + 1); - - not_rtsp: - /* - * We don't consider this part of an RTSP request or - * reply, so we don't display it. - */ - break; - - is_rtsp: - /* - * Process this line. - */ - if (linelen == 0) { - /* - * This is a blank line, which means that - * whatever follows it isn't part of this - * request or reply. - */ - proto_tree_add_text(rtsp_tree, tvb, offset, - next_offset - offset, "%s", - tvb_format_text(tvb, offset, next_offset - offset)); - offset = next_offset; - break; - } - - /* - * Not a blank line - either a request, a reply, or a header - * line. - */ - saw_req_resp_or_header = TRUE; - if (rtsp_tree) { - ti = proto_tree_add_text(rtsp_tree, tvb, offset, - next_offset - offset, "%s", - tvb_format_text(tvb, offset, next_offset - offset)); - - sub_tree = proto_item_add_subtree(ti, ett_rtsp_method); - - switch (rtsp_type) { - - case RTSP_REQUEST: - process_rtsp_request(tvb, offset, line, linelen, - sub_tree); - break; - - case RTSP_REPLY: - process_rtsp_reply(tvb, offset, line, linelen, - sub_tree); - break; - - case NOT_RTSP: - break; - } - } - if (is_header) { - /* - * Process some headers specially. - */ -#define HDR_MATCHES(header) \ - (linelen > STRLEN_CONST(header) && \ - strncasecmp(line, (header), STRLEN_CONST(header)) == 0) - - if (HDR_MATCHES(rtsp_transport)) { - /* - * Based on the port numbers specified - * in the Transport: header, set up - * a conversation that will be dissected - * with the appropriate dissector. - */ - rtsp_create_conversation(pinfo, line, linelen); - } else if (HDR_MATCHES(rtsp_content_type)) { - /* - * If the Content-Type: header says this - * is SDP, dissect the payload as SDP. - * - * XXX - we should just do the same - * sort of header processing - * that HTTP does, and use the - * "media_type" dissector table on - * the content type. - * - * We should use those for Transport: - * and Content-Length: as well (and - * should process Content-Length: in - * HTTP). - */ - if (is_content_sdp(line, linelen)) - is_sdp = TRUE; - } else if (HDR_MATCHES(rtsp_content_length)) { - /* - * Only the amount specified by the - * Content-Length: header should be treated - * as payload. - */ - content_length = rtsp_get_content_length(line, - linelen); - - } else if (HDR_MATCHES(rtsp_Session)) { - /* - * Extract the session string - - */ - - if ( colon_offset != -1 ){ - /* - * Skip whitespace after the colon. - * (Code from SIP dissector ) - */ - value_offset = colon_offset + 1; - while (value_offset < line_end_offset - && ((c = tvb_get_guint8(tvb, - value_offset)) == ' ' - || c == '\t')) - value_offset++; - /* - * Put the value into the protocol tree - */ - value_len = line_end_offset - value_offset; - proto_tree_add_string(sub_tree, hf_rtsp_session,tvb, - value_offset, value_len , - tvb_format_text(tvb, value_offset, value_len)); - } - - } else if (HDR_MATCHES(rtsp_X_Vig_Msisdn)) { - /* - * Extract the X_Vig_Msisdn string - */ - if ( colon_offset != -1 ){ - /* - * Skip whitespace after the colon. - * (Code from SIP dissector ) - */ - value_offset = colon_offset + 1; - while (value_offset < line_end_offset - && ((c = tvb_get_guint8(tvb, - value_offset)) == ' ' - || c == '\t')) - value_offset++; - /* - * Put the value into the protocol tree - */ - value_len = line_end_offset - value_offset; - proto_tree_add_string(sub_tree, hf_rtsp_X_Vig_Msisdn,tvb, - value_offset, value_len , - tvb_format_text(tvb, value_offset, value_len)); - - e164_info.e164_number_type = CALLING_PARTY_NUMBER; - e164_info.nature_of_address = 0; - - e164_info.E164_number_str = tvb_get_string(tvb, value_offset, - value_len); - e164_info.E164_number_length = value_len; - dissect_e164_number(tvb, sub_tree, value_offset, - value_len, e164_info); - g_free(e164_info.E164_number_str); - - - } - } - - } - offset = next_offset; - } - - /* - * If a content length was supplied, the amount of data to be - * processed as RTSP payload is the minimum of the content - * length and the amount of data remaining in the frame. - * - * If no content length was supplied (or if a bad content length - * was supplied), the amount of data to be processed is the amount - * of data remaining in the frame. - */ - datalen = tvb_length_remaining(tvb, offset); - reported_datalen = tvb_reported_length_remaining(tvb, offset); - if (content_length != -1) { - /* - * Content length specified; display only that amount - * as payload. - */ - if (datalen > content_length) - datalen = content_length; - - /* - * XXX - limit the reported length in the tvbuff we'll - * hand to a subdissector to be no greater than the - * content length. - * - * We really need both unreassembled and "how long it'd - * be if it were reassembled" lengths for tvbuffs, so - * that we throw the appropriate exceptions for - * "not enough data captured" (running past the length), - * "packet needed reassembly" (within the length but - * running past the unreassembled length), and - * "packet is malformed" (running past the reassembled - * length). - */ - if (reported_datalen > content_length) - reported_datalen = content_length; - } else { - /* - * No content length specified; if this message doesn't - * have a body if no content length is specified, process - * nothing as payload. - */ - if (body_requires_content_len) - datalen = 0; - } - - if (datalen > 0) { - /* - * There's stuff left over; process it. - */ - if (is_sdp) { - tvbuff_t *new_tvb; - - /* - * Fix up the top-level item so that it doesn't - * include the SDP stuff. - */ - if (ti != NULL) - proto_item_set_len(ti, offset); - - /* - * Now create a tvbuff for the SDP stuff and - * dissect it. - * - * The amount of data to be processed that's - * available in the tvbuff is "datalen", which - * is the minimum of the amount of data left in - * the tvbuff and any specified content length. - * - * The amount of data to be processed that's in - * this frame, regardless of whether it was - * captured or not, is "reported_datalen", - * which, if no content length was specified, - * is -1, i.e. "to the end of the frame. - */ - new_tvb = tvb_new_subset(tvb, offset, datalen, - reported_datalen); - call_dissector(sdp_handle, new_tvb, pinfo, tree); - } else { - if (tvb_get_guint8(tvb, offset) == RTSP_FRAMEHDR) { - /* - * This is interleaved stuff; don't - * treat it as raw data - set "datalen" - * to 0, so we won't skip the offset - * past it, which will cause our - * caller to process that stuff itself. - */ - datalen = 0; - } else { - proto_tree_add_text(rtsp_tree, tvb, offset, - datalen, "Data (%d bytes)", - reported_datalen); - } - } - - /* - * We've processed "datalen" bytes worth of data - * (which may be no data at all); advance the - * offset past whatever data we've processed. - */ - offset += datalen; - } - return offset - orig_offset; -} - -static void -process_rtsp_request(tvbuff_t *tvb, int offset, const guchar *data, - size_t linelen, proto_tree *tree) -{ - const guchar *lineend = data + linelen; - unsigned ii; - const guchar *url; - const guchar *url_start; - guchar *tmp_url; - - /* Request Methods */ - for (ii = 0; ii < RTSP_NMETHODS; ii++) { - size_t len = strlen(rtsp_methods[ii]); - if (linelen >= len && - strncasecmp(rtsp_methods[ii], data, len) == 0 && - (len == linelen || isspace(data[len]))) - break; - } - if (ii == RTSP_NMETHODS) { - /* - * We got here because "is_rtsp_request_or_reply()" returned - * RTSP_REQUEST, so we know one of the request methods - * matched, so we "can't get here". - */ - g_assert_not_reached(); - } - - /* Method name */ - proto_tree_add_string(tree, hf_rtsp_method, tvb, offset, - strlen(rtsp_methods[ii]), rtsp_methods[ii]); - - - /* URL */ - url = data; - while (url < lineend && !isspace(*url)) - url++; - while (url < lineend && isspace(*url)) - url++; - url_start = url; - while (url < lineend && !isspace(*url)) - url++; - tmp_url = g_malloc(url - url_start + 1); - memcpy(tmp_url, url_start, url - url_start); - tmp_url[url - url_start] = 0; - proto_tree_add_string(tree, hf_rtsp_url, tvb, - offset + (url_start - data), url - url_start, tmp_url); - g_free(tmp_url); -} - -static void -process_rtsp_reply(tvbuff_t *tvb, int offset, const guchar *data, - size_t linelen, proto_tree *tree) -{ - const guchar *lineend = data + linelen; - const guchar *status = data; - const guchar *status_start; - unsigned int status_i; - - /* status code */ - while (status < lineend && !isspace(*status)) - status++; - while (status < lineend && isspace(*status)) - status++; - status_start = status; - status_i = 0; - while (status < lineend && isdigit(*status)) - status_i = status_i * 10 + *status++ - '0'; - proto_tree_add_uint(tree, hf_rtsp_status, tvb, - offset + (status_start - data), - status - status_start, status_i); -} - -static void -dissect_rtsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) -{ - int offset = 0; - int len; - - while (tvb_reported_length_remaining(tvb, offset) != 0) { - len = (tvb_get_guint8(tvb, offset) == RTSP_FRAMEHDR) - ? dissect_rtspinterleaved(tvb, offset, pinfo, tree) - : dissect_rtspmessage(tvb, offset, pinfo, tree); - if (len == -1) - break; - offset += len; - - /* - * OK, we've set the Protocol and Info columns for the - * first RTSP message; make the columns non-writable, - * so that we don't change it for subsequent RTSP messages. - */ - col_set_writable(pinfo->cinfo, FALSE); - } -} - -static void -rtsp_init(void) -{ -/* Routine to initialize rtsp protocol before each capture or filter pass. */ -/* Release any memory if needed. Then setup the memory chunks. */ - - if (rtsp_vals) - g_mem_chunk_destroy(rtsp_vals); - - rtsp_vals = g_mem_chunk_new("rtsp_vals", - sizeof(rtsp_conversation_data_t), - rtsp_hash_init_count * sizeof(rtsp_conversation_data_t), - G_ALLOC_AND_FREE); -} - -void -proto_register_rtsp(void) -{ - static gint *ett[] = { - &ett_rtspframe, - &ett_rtsp, - &ett_rtsp_method, - }; - static hf_register_info hf[] = { - { &hf_rtsp_method, - { "Method", "rtsp.method", FT_STRING, BASE_NONE, NULL, 0, - "", HFILL }}, - { &hf_rtsp_url, - { "URL", "rtsp.url", FT_STRING, BASE_NONE, NULL, 0, - "", HFILL }}, - { &hf_rtsp_status, - { "Status", "rtsp.status", FT_UINT32, BASE_DEC, NULL, 0, - "", HFILL }}, - { &hf_rtsp_session, - { "Session", "rtsp.session", FT_STRING, BASE_NONE, NULL, 0, - "", HFILL }}, - { &hf_rtsp_X_Vig_Msisdn, - { "X-Vig-Msisdn", "X_Vig_Msisdn", FT_STRING, BASE_NONE, NULL, 0, - "", HFILL }}, - - - }; - module_t *rtsp_module; - - proto_rtsp = proto_register_protocol("Real Time Streaming Protocol", - "RTSP", "rtsp"); - proto_register_field_array(proto_rtsp, hf, array_length(hf)); - proto_register_subtree_array(ett, array_length(ett)); - - /* Register our configuration options, particularly our ports */ - - rtsp_module = prefs_register_protocol(proto_rtsp, proto_reg_handoff_rtsp); - prefs_register_uint_preference(rtsp_module, "tcp.port", - "RTSP TCP Port", - "Set the TCP port for RTSP messages", - 10, &global_rtsp_tcp_port); - prefs_register_uint_preference(rtsp_module, "tcp.alternate_port", - "Alternate RTSP TCP Port", - "Set the alternate TCP port for RTSP messages", - 10, &global_rtsp_tcp_alternate_port); - prefs_register_bool_preference(rtsp_module, "desegment_headers", - "Desegment all RTSP headers\nspanning multiple TCP segments", - "Whether the RTSP dissector should desegment all headers " - "of a request spanning multiple TCP segments", - &rtsp_desegment_headers); - prefs_register_bool_preference(rtsp_module, "desegment_body", - "Trust the \"Content-length:\" header and\ndesegment RTSP " - "bodies\nspanning multiple TCP segments", - "Whether the RTSP dissector should use the " - "\"Content-length:\" value to desegment the body " - "of a request spanning multiple TCP segments", - &rtsp_desegment_body); - - register_init_routine(rtsp_init); /* register re-init routine */ -} - -void -proto_reg_handoff_rtsp(void) -{ - dissector_handle_t rtsp_handle; - static int rtsp_prefs_initialized = FALSE; - - rtsp_handle = create_dissector_handle(dissect_rtsp, proto_rtsp); - - if (!rtsp_prefs_initialized) { - rtsp_prefs_initialized = TRUE; - } - else { - dissector_delete("tcp.port", tcp_port, rtsp_handle); - dissector_delete("tcp.port", tcp_alternate_port, rtsp_handle); - } - /* Set our port number for future use */ - - tcp_port = global_rtsp_tcp_port; - tcp_alternate_port = global_rtsp_tcp_alternate_port; - - dissector_add("tcp.port", tcp_port, rtsp_handle); - dissector_add("tcp.port", tcp_alternate_port, rtsp_handle); - - sdp_handle = find_dissector("sdp"); - rtp_handle = find_dissector("rtp"); - rtcp_handle = find_dissector("rtcp"); -} |