Add a check to see if the URI is a Tel URI and prevent crashing on
trying to retrieve the reason parameter.
ASTERISK-29191
ASTERISK-29219
Change-Id: I0320aa205f22cda511d60a2edf2b037e8fd6cc37
(cherry picked from commit a7aea71e60
)
717 lines
20 KiB
C
717 lines
20 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2013, Digium, Inc.
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*
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* Kevin Harwell <kharwell@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*** MODULEINFO
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<depend>pjproject</depend>
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<depend>res_pjsip</depend>
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<depend>res_pjsip_session</depend>
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include <pjsip.h>
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#include <pjsip_ua.h>
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#include "asterisk/res_pjsip.h"
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#include "asterisk/res_pjsip_session.h"
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#include "asterisk/callerid.h"
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#include "asterisk/channel.h"
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#include "asterisk/module.h"
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#include "asterisk/strings.h"
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static const pj_str_t diversion_name = { "Diversion", 9 };
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static const pj_str_t history_info_name = { "History-Info", 12 };
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static pj_str_t HISTINFO_SUPPORTED_NAME = { "histinfo", 8 };
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/*!
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* \internal
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* \brief Determine if the given string is a SIP token.
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* \since 13.8.0
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*
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* \param str String to determine if is a SIP token.
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*
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* \note A token is defined by RFC3261 Section 25.1
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*
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* \return Non-zero if the string is a SIP token.
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*/
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static int sip_is_token(const char *str)
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{
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int is_token;
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if (ast_strlen_zero(str)) {
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/* An empty string is not a token. */
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return 0;
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}
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is_token = 1;
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do {
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if (!isalnum(*str)
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&& !strchr("-.!%*_+`'~", *str)) {
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/* The character is not allowed in a token. */
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is_token = 0;
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break;
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}
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} while (*++str);
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return is_token;
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}
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/*! \brief Diversion header reasons
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*
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* The core defines a bunch of constants used to define
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* redirecting reasons. This provides a translation table
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* between those and the strings which may be present in
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* a SIP Diversion header
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*/
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static const struct reasons {
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enum AST_REDIRECTING_REASON code;
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const char *text;
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const unsigned int cause;
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} reason_table[] = {
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{ AST_REDIRECTING_REASON_UNKNOWN, "unknown", 404 },
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{ AST_REDIRECTING_REASON_USER_BUSY, "user-busy", 486 },
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{ AST_REDIRECTING_REASON_NO_ANSWER, "no-answer", 408 },
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{ AST_REDIRECTING_REASON_UNAVAILABLE, "unavailable", 503 },
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{ AST_REDIRECTING_REASON_UNCONDITIONAL, "unconditional", 302 },
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{ AST_REDIRECTING_REASON_TIME_OF_DAY, "time-of-day", 404 },
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{ AST_REDIRECTING_REASON_DO_NOT_DISTURB, "do-not-disturb", 404 },
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{ AST_REDIRECTING_REASON_DEFLECTION, "deflection", 480 },
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{ AST_REDIRECTING_REASON_FOLLOW_ME, "follow-me", 404 },
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{ AST_REDIRECTING_REASON_OUT_OF_ORDER, "out-of-service", 404 },
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{ AST_REDIRECTING_REASON_AWAY, "away", 404 },
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{ AST_REDIRECTING_REASON_CALL_FWD_DTE, "cf_dte", 404 }, /* Non-standard */
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{ AST_REDIRECTING_REASON_SEND_TO_VM, "send_to_vm", 404 }, /* Non-standard */
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};
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static enum AST_REDIRECTING_REASON cause_to_reason(const unsigned long cause) {
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switch(cause) {
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case 302:
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return AST_REDIRECTING_REASON_UNCONDITIONAL;
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case 486:
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return AST_REDIRECTING_REASON_USER_BUSY;
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case 408:
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return AST_REDIRECTING_REASON_NO_ANSWER;
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case 480:
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case 487:
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return AST_REDIRECTING_REASON_DEFLECTION;
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case 503:
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return AST_REDIRECTING_REASON_UNAVAILABLE;
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default:
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return AST_REDIRECTING_REASON_UNKNOWN;
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}
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}
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static int add_supported(pjsip_tx_data *tdata)
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{
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pjsip_supported_hdr *hdr;
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hdr = pjsip_msg_find_hdr(tdata->msg, PJSIP_H_SUPPORTED, NULL);
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if (!hdr) {
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/* insert a new Supported header */
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hdr = pjsip_supported_hdr_create(tdata->pool);
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if (!hdr) {
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return -1;
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}
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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/* add on to the existing Supported header */
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pj_strassign(&hdr->values[hdr->count++], &HISTINFO_SUPPORTED_NAME);
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return 0;
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}
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static const char *reason_code_to_str(const struct ast_party_redirecting_reason *reason)
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{
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int idx;
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int code;
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/* use specific string if given */
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if (!ast_strlen_zero(reason->str)) {
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return reason->str;
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}
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code = reason->code;
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for (idx = 0; idx < ARRAY_LEN(reason_table); ++idx) {
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if (code == reason_table[idx].code) {
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return reason_table[idx].text;
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}
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}
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return "unknown";
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}
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static const unsigned int reason_code_to_cause(const struct ast_party_redirecting_reason *reason)
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{
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int idx;
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int code;
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code = reason->code;
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for (idx = 0; idx < ARRAY_LEN(reason_table); ++idx) {
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if (code == reason_table[idx].code) {
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return reason_table[idx].cause;
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}
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}
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return 404;
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}
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static pjsip_fromto_hdr *get_diversion_header(pjsip_rx_data *rdata)
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{
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static const pj_str_t from_name = { "From", 4 };
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pjsip_generic_string_hdr *hdr;
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pj_str_t value;
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int size;
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if (!(hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &diversion_name, NULL))) {
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return NULL;
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}
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pj_strdup_with_null(rdata->tp_info.pool, &value, &hdr->hvalue);
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/* parse as a fromto header */
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return pjsip_parse_hdr(rdata->tp_info.pool, &from_name, value.ptr,
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pj_strlen(&value), &size);
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}
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/* Asterisk keeps track of 2 things. The redirected from address and
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* the redirected to address. If first=0 method will get the most recent
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* redirection target for use as the redirected to address. If first=1
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* then this method will get the original redirection target (index=1)
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* for use as the redirected from address.
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*/
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static pjsip_fromto_hdr *get_history_info_header(pjsip_rx_data *rdata, const unsigned int first)
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{
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static const pj_str_t from_name = { "From", 4 };
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pjsip_fromto_hdr * result_hdr = NULL;
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pjsip_generic_string_hdr *hdr = NULL;
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hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &history_info_name, NULL);
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if (!hdr) {
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return NULL;
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}
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do {
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static const pj_str_t index_name = { "index", 5 };
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pj_str_t value;
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int size;
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pjsip_fromto_hdr * fromto_hdr = NULL;
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pjsip_param * index = NULL;
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pj_strdup_with_null(rdata->tp_info.pool, &value, &hdr->hvalue);
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/* parse as a fromto header */
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fromto_hdr = pjsip_parse_hdr(rdata->tp_info.pool, &from_name, value.ptr,
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pj_strlen(&value), &size);
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if (fromto_hdr == NULL) {
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continue;
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}
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index = pjsip_param_find(&fromto_hdr->other_param, &index_name);
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if (index) {
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if (!pj_strcmp2(&index->value, "1")) {
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if (!first) {
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continue;
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} else {
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return fromto_hdr;
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}
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}
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}
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result_hdr = fromto_hdr;
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} while ((hdr = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &history_info_name, hdr->next)));
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return result_hdr;
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}
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static void set_redirecting_value(char **dst, const pj_str_t *src)
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{
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ast_free(*dst);
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*dst = ast_malloc(pj_strlen(src) + 1);
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if (*dst) {
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ast_copy_pj_str(*dst, src, pj_strlen(src) + 1);
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}
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}
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static void set_redirecting_id(pjsip_name_addr *name_addr, struct ast_party_id *data,
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struct ast_set_party_id *update)
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{
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pjsip_sip_uri *uri = pjsip_uri_get_uri(name_addr->uri);
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char *semi;
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pj_str_t uri_user;
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uri_user = uri->user;
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/* Always truncate redirecting number at a semicolon. */
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semi = pj_strchr(&uri_user, ';');
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if (semi) {
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/*
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* We need to be able to handle URI's looking like
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* "sip:1235557890;phone-context=national@x.x.x.x;user=phone"
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*
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* Where the uri->user field will result in:
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* "1235557890;phone-context=national"
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*
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* People don't care about anything after the semicolon
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* showing up on their displays even though the RFC
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* allows the semicolon.
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*/
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pj_strset(&uri_user, (char *) pj_strbuf(&uri_user), semi - pj_strbuf(&uri_user));
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}
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if (pj_strlen(&uri_user)) {
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update->number = 1;
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data->number.valid = 1;
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set_redirecting_value(&data->number.str, &uri_user);
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}
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if (pj_strlen(&name_addr->display)) {
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update->name = 1;
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data->name.valid = 1;
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set_redirecting_value(&data->name.str, &name_addr->display);
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}
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}
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static void copy_redirecting_id(struct ast_party_id *dst, const struct ast_party_id *src,
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struct ast_set_party_id *update)
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{
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ast_party_id_copy(dst, src);
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if (dst->number.valid) {
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update->number = 1;
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}
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if (dst->name.valid) {
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update->name = 1;
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}
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}
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static void set_redirecting_reason_by_cause(pjsip_name_addr *name_addr,
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struct ast_party_redirecting_reason *data)
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{
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static const pj_str_t cause_name = { "cause", 5 };
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pjsip_sip_uri *uri = pjsip_uri_get_uri(name_addr);
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pjsip_param *cause = NULL;
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unsigned long cause_value = 0;
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if (!PJSIP_URI_SCHEME_IS_SIP(uri) && !PJSIP_URI_SCHEME_IS_SIPS(uri)) {
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return;
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}
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cause = pjsip_param_find(&uri->other_param, &cause_name);
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if (!cause) {
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return;
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}
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cause_value = pj_strtoul(&cause->value);
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data->code = cause_to_reason(cause_value);
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ast_free(data->str);
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data->str = ast_strdup("");
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}
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static void set_redirecting_reason(pjsip_fromto_hdr *from_info, pjsip_name_addr *to_info,
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struct ast_party_redirecting_reason *data)
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{
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static const pj_str_t reason_name = { "reason", 6 };
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pjsip_param *reason = pjsip_param_find(&from_info->other_param, &reason_name);
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char *reason_str;
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if (!reason) {
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if (to_info) {
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set_redirecting_reason_by_cause(to_info, data);
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}
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return;
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}
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set_redirecting_value(&data->str, &reason->value);
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if (!data->str) {
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/* Oops, allocation failure */
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return;
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}
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reason_str = ast_strdupa(data->str);
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/* Remove any enclosing double-quotes */
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if (*reason_str == '"') {
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reason_str = ast_strip_quoted(reason_str, "\"", "\"");
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}
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data->code = ast_redirecting_reason_parse(reason_str);
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if (data->code < 0) {
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data->code = AST_REDIRECTING_REASON_UNKNOWN;
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} else {
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ast_free(data->str);
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data->str = ast_strdup("");
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}
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}
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static void set_redirecting(struct ast_sip_session *session,
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pjsip_fromto_hdr *from_info,
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pjsip_name_addr *to_info)
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{
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struct ast_party_redirecting data;
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struct ast_set_party_redirecting update;
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if (!session->channel) {
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return;
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}
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ast_party_redirecting_init(&data);
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memset(&update, 0, sizeof(update));
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data.reason.code = AST_REDIRECTING_REASON_UNKNOWN;
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if (from_info) {
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set_redirecting_id((pjsip_name_addr*)from_info->uri,
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&data.from, &update.from);
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set_redirecting_reason(from_info, to_info, &data.reason);
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ast_set_party_id_all(&update.priv_to);
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} else {
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copy_redirecting_id(&data.from, &session->id, &update.from);
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}
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if (to_info) {
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set_redirecting_id(to_info, &data.to, &update.to);
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}
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ast_set_party_id_all(&update.priv_orig);
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ast_set_party_id_all(&update.priv_from);
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ast_set_party_id_all(&update.priv_to);
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++data.count;
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ast_channel_set_redirecting(session->channel, &data, &update);
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/* Only queue an indication if it was due to a response */
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if (session->inv_session->role == PJSIP_ROLE_UAC) {
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ast_channel_queue_redirecting_update(session->channel, &data, &update);
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}
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ast_party_redirecting_free(&data);
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}
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static int diversion_incoming_request(struct ast_sip_session *session, pjsip_rx_data *rdata)
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{
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pjsip_fromto_hdr *hdr = get_diversion_header(rdata);
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if (hdr) {
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set_redirecting(session, hdr, (pjsip_name_addr*)
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PJSIP_MSG_TO_HDR(rdata->msg_info.msg)->uri);
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} else {
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pjsip_fromto_hdr *history_info_to;
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pjsip_fromto_hdr *history_info_from;
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history_info_to = get_history_info_header(rdata, 0);
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if (history_info_to) {
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/* If History-Info is present, then it will also include the original
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redirected-from in addition to the redirected-to */
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history_info_from = get_history_info_header(rdata, 1);
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set_redirecting(session, history_info_from, (pjsip_name_addr*)history_info_to->uri);
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}
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}
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return 0;
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}
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static void diversion_incoming_response(struct ast_sip_session *session, pjsip_rx_data *rdata)
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{
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static const pj_str_t contact_name = { "Contact", 7 };
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static const pj_str_t contact_name_s = { "m", 1 };
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pjsip_status_line status = rdata->msg_info.msg->line.status;
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pjsip_fromto_hdr *div_hdr;
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pjsip_fromto_hdr *history_info_to;
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pjsip_fromto_hdr *history_info_from;
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pjsip_contact_hdr *contact_hdr;
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if ((status.code != 302) && (status.code != 181)) {
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return;
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}
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/* use the diversion header info if there is one. if not one then use the
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the history-info, if that doesn't exist, use session caller id info. if
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that doesn't exist use info from the To hdr*/
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if (!(div_hdr = get_diversion_header(rdata))) {
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history_info_to = get_history_info_header(rdata, 0);
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if (history_info_to) {
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/* If History-Info is present, then it will also include the original
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redirected-from in addition to the redirected-to */
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history_info_from = get_history_info_header(rdata, 1);
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set_redirecting(session, history_info_from, (pjsip_name_addr*)history_info_to->uri);
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return;
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}
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if (!div_hdr && !session->id.number.valid) {
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div_hdr = PJSIP_MSG_TO_HDR(rdata->msg_info.msg);
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}
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}
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if (status.code == 302) {
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/* With 302, Contact indicates the final destination and possibly Diversion indicates the hop before */
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contact_hdr = pjsip_msg_find_hdr_by_names(rdata->msg_info.msg, &contact_name, &contact_name_s, NULL);
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set_redirecting(session, div_hdr, contact_hdr ? (pjsip_name_addr*)contact_hdr->uri :
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(pjsip_name_addr*)PJSIP_MSG_FROM_HDR(rdata->msg_info.msg)->uri);
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} else {
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/* With 181, Diversion is non-standard, but if present indicates the new final destination, and To indicating the original */
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set_redirecting(session, PJSIP_MSG_TO_HDR(rdata->msg_info.msg),
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div_hdr ? (pjsip_name_addr*)div_hdr->uri : NULL);
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}
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}
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/*!
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* \internal
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* \brief Adds diversion header information to an outbound SIP message
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*
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* \param tdata The outbound message
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* \param data The redirecting data used to fill parts of the diversion header
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*/
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static void add_diversion_header(pjsip_tx_data *tdata, struct ast_party_redirecting *data)
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{
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static const pj_str_t reason_name = { "reason", 6 };
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pjsip_fromto_hdr *hdr;
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pjsip_name_addr *name_addr;
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pjsip_sip_uri *uri;
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pjsip_param *param;
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pjsip_fromto_hdr *old_hdr;
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const char *reason_str;
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const char *quote_str;
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char *reason_buf;
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pjsip_uri *base;
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struct ast_party_id *id = NULL;
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if (tdata->msg->type == PJSIP_REQUEST_MSG) {
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id = &data->from;
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} else {
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/* In responses indicate the new destination */
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id = &data->to;
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}
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base = PJSIP_MSG_FROM_HDR(tdata->msg)->uri;
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if (!id->number.valid || ast_strlen_zero(id->number.str)) {
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return;
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}
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hdr = pjsip_from_hdr_create(tdata->pool);
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hdr->type = PJSIP_H_OTHER;
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hdr->sname = hdr->name = diversion_name;
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name_addr = pjsip_uri_clone(tdata->pool, base);
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uri = pjsip_uri_get_uri(name_addr->uri);
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pj_strdup2(tdata->pool, &name_addr->display, id->name.str);
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pj_strdup2(tdata->pool, &uri->user, id->number.str);
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param = PJ_POOL_ALLOC_T(tdata->pool, pjsip_param);
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param->name = reason_name;
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reason_str = reason_code_to_str(&data->reason);
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/* Reason is either already quoted or it is a token to not need quotes added. */
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quote_str = *reason_str == '\"' || sip_is_token(reason_str) ? "" : "\"";
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reason_buf = pj_pool_alloc(tdata->pool, strlen(reason_str) + 3);
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sprintf(reason_buf, "%s%s%s", quote_str, reason_str, quote_str);/* Safe */
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param->value = pj_str(reason_buf);
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pj_list_insert_before(&hdr->other_param, param);
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hdr->uri = (pjsip_uri *) name_addr;
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old_hdr = pjsip_msg_find_hdr_by_name(tdata->msg, &diversion_name, NULL);
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if (old_hdr) {
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pj_list_erase(old_hdr);
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}
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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/*!
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* \internal
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* \brief Adds history-info header information to an outbound SIP message
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*
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* \param tdata The outbound message
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* \param data The redirecting data used to fill parts of the history-info header
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*/
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static void add_history_info_header(pjsip_tx_data *tdata, struct ast_party_redirecting *data)
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{
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static const pj_str_t index_name = { "index", 5 };
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static const pj_str_t cause_name = { "cause", 5 };
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static const pj_str_t first_index = { "1", 1 };
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static const pj_str_t last_index = { "1.1", 3 };
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pjsip_fromto_hdr *hdr;
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pjsip_name_addr *name_addr;
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pjsip_sip_uri *uri;
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pjsip_param *param;
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pjsip_fromto_hdr *old_hdr;
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unsigned int cause;
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char *cause_buf;
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struct ast_party_id *to = &data->to;
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struct ast_party_id *from = &data->from;
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pjsip_uri *base = PJSIP_MSG_TO_HDR(tdata->msg)->uri;
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hdr = pjsip_from_hdr_create(tdata->pool);
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hdr->type = PJSIP_H_OTHER;
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hdr->sname = hdr->name = history_info_name;
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name_addr = pjsip_uri_clone(tdata->pool, base);
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uri = pjsip_uri_get_uri(name_addr->uri);
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/* if no redirecting information, then TO is the original destination */
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if (from->number.valid && !ast_strlen_zero(from->number.str)) {
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pj_strdup2(tdata->pool, &name_addr->display, from->name.str);
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pj_strdup2(tdata->pool, &uri->user, from->number.str);
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}
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param = PJ_POOL_ALLOC_T(tdata->pool, pjsip_param);
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param->name = index_name;
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param->value = first_index;
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pj_list_insert_before(&hdr->other_param, param);
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hdr->uri = (pjsip_uri *) name_addr;
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while ((old_hdr = pjsip_msg_find_hdr_by_name(tdata->msg, &history_info_name, NULL)) != NULL) {
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pj_list_erase(old_hdr);
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}
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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if (!to->number.valid || ast_strlen_zero(to->number.str)) {
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return;
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}
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hdr = pjsip_from_hdr_create(tdata->pool);
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hdr->type = PJSIP_H_OTHER;
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hdr->sname = hdr->name = history_info_name;
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name_addr = pjsip_uri_clone(tdata->pool, base);
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uri = pjsip_uri_get_uri(name_addr->uri);
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pj_strdup2(tdata->pool, &name_addr->display, to->name.str);
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pj_strdup2(tdata->pool, &uri->user, to->number.str);
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param = PJ_POOL_ALLOC_T(tdata->pool, pjsip_param);
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param->name = index_name;
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param->value = last_index;
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pj_list_insert_before(&hdr->other_param, param);
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param = PJ_POOL_ALLOC_T(tdata->pool, pjsip_param);
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param->name = cause_name;
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cause = reason_code_to_cause(&data->reason);
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cause_buf = pj_pool_alloc(tdata->pool, 4);
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snprintf(cause_buf, 4, "%ud", cause);
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param->value = pj_str(cause_buf);
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pj_list_insert_before(&uri->other_param, param);
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hdr->uri = (pjsip_uri *) name_addr;
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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static void get_redirecting_add_diversion(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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struct ast_party_redirecting *data;
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add_supported(tdata);
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if (session->channel && session->endpoint->id.send_diversion &&
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(data = ast_channel_redirecting(session->channel))->count) {
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add_diversion_header(tdata, data);
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}
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if (session->channel && session->endpoint->id.send_history_info) {
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data = ast_channel_redirecting(session->channel);
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add_history_info_header(tdata, data);
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}
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}
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/*!
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* \internal
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* \brief Adds a diversion header to an outgoing INVITE request if
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* redirecting information is available.
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*
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* \param session The session on which the INVITE request is to be sent
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* \param tdata The outbound INVITE request
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*/
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static void diversion_outgoing_request(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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get_redirecting_add_diversion(session, tdata);
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}
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/*!
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* \internal
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* \brief Adds a diversion header to an outgoing 3XX response
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*
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* \param session The session on which the INVITE response is to be sent
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* \param tdata The outbound INVITE response
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*/
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static void diversion_outgoing_response(struct ast_sip_session *session, pjsip_tx_data *tdata)
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{
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struct pjsip_status_line status = tdata->msg->line.status;
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/* add to 302 and 181 */
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if (PJSIP_IS_STATUS_IN_CLASS(status.code, 300) || (status.code == 181)) {
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get_redirecting_add_diversion(session, tdata);
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}
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}
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static struct ast_sip_session_supplement diversion_supplement = {
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.method = "INVITE",
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/* this supplement needs to be called after caller id
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and after the channel has been created */
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.priority = AST_SIP_SUPPLEMENT_PRIORITY_CHANNEL + 100,
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.incoming_request = diversion_incoming_request,
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.incoming_response = diversion_incoming_response,
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.outgoing_request = diversion_outgoing_request,
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.outgoing_response = diversion_outgoing_response,
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.response_priority = AST_SIP_SESSION_BEFORE_MEDIA,
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};
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static int load_module(void)
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{
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/* Because we are passing static memory to pjsip, we need to make sure it
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* stays valid while we potentially have active sessions */
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ast_module_shutdown_ref(ast_module_info->self);
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ast_sip_session_register_supplement(&diversion_supplement);
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return AST_MODULE_LOAD_SUCCESS;
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}
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static int unload_module(void)
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{
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ast_sip_session_unregister_supplement(&diversion_supplement);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "PJSIP Add Diversion Header Support",
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.support_level = AST_MODULE_SUPPORT_CORE,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_APP_DEPEND,
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.requires = "res_pjsip,res_pjsip_session",
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);
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