WIP VoLTE support for Asterisk
This commit is contained in:
Andreas Eversberg
parent
1245ccfefb
commit
95585d85c2
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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 <pjlib.h>
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#include <pjmedia.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/utils.h"
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#include "asterisk/module.h"
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#include "asterisk/causes.h"
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#include "asterisk/threadpool.h"
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#define PJ_CONSUME PJ_TRUE
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const pj_str_t STR_SUPPORTED = { "Supported", 9 };
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const pj_str_t STR_REQUIRE = { "Require", 7 };
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const pj_str_t STR_PROXY_REQUIRE = { "Proxy-Require", 13 };
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const pj_str_t STR_PATH = { "path", 4 };
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const pj_str_t STR_SEC_AGREE = { "sec-agree", 9 };
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const pj_str_t STR_SECURITY_CLIENT = { "Security-Client", 15 };
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const char *ipsec_alg[] = {
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"hmac-md5-96",
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"hmac-sha-1-96",
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NULL
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};
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const char *ipsec_ealg[] = {
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"null",
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NULL
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};
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static pj_status_t on_load(pjsip_endpoint *endpt)
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{
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printf("endpoint!\n");
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return PJ_SUCCESS;
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}
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/* Check if message is exchanged with IMS.
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* This approach uses the host name of the URI. */
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static pj_bool_t is_ims(const pjsip_msg *msg)
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{
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pjsip_fromto_hdr *hdr;
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pjsip_sip_uri *uri;
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size_t uri_len;
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/* Get URI. */
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hdr = pjsip_msg_find_hdr(msg, PJSIP_H_TO, NULL);
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if (!hdr)
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return PJ_FALSE;
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uri = pjsip_uri_get_uri(hdr->uri);
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uri_len = strlen(uri->host.ptr);
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if (uri_len < 20)
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return PJ_FALSE;
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if (!!strncmp(uri->host.ptr, "ims.", 4))
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return PJ_FALSE;
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if (!!strncmp(uri->host.ptr + uri_len - 16, ".3gppnetwork.org", 16))
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return PJ_FALSE;
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return PJ_TRUE;
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}
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#warning ip xfrm state add src <source_ip> dst <destination_ip> proto esp spi <spi_value> auth hmac-sha1-96 0x<key_hex>
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static void add_securety_client_hdr(pjsip_tx_data *tdata, const char *alg[], const char *ealg[], uint32_t spi_c, uint32_t spi_s, uint16_t port_c, uint16_t port_s)
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{
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pjsip_generic_array_hdr *hdr;
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char str[256];
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int i, j;
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puts("add sec");
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/* Add Security-Client header. */
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hdr = pjsip_generic_array_hdr_create(tdata->pool, &STR_SECURITY_CLIENT);
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if (!hdr) {
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ast_log(LOG_ERROR, "Failed to create header.");
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return;
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}
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/* Create tupple for given algorithms. */
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for (i = 0; alg[i]; i++) {
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for (j = 0; ealg[j]; j++) {
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snprintf(str, sizeof(str), "ipsec-3gpp; alg=%s; ealg=%s; spi-c=%u; spi-s=%u; port-c=%u; port-s=%u", alg[i], ealg[j], spi_c, spi_s, port_c, port_s);
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if (hdr->count == PJSIP_GENERIC_ARRAY_MAX_COUNT) {
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ast_log(LOG_ERROR, "Too many evalue in array, skipping '%s'.", str);
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continue;
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}
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pj_strdup2(tdata->pool, &hdr->values[hdr->count++], str);
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}
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}
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/* Append header */
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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static void add_value_string_hdr(pjsip_tx_data *tdata, const pj_str_t *name, const pj_str_t *value)
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{
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pjsip_generic_string_hdr *hdr;
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/* Add Proxy-Require header. */
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hdr = pjsip_generic_string_hdr_create(tdata->pool, name, value);
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if (!hdr) {
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ast_log(LOG_ERROR, "Failed to create header.");
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return;
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}
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/* Append header */
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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static void add_value_array_hdr(pjsip_tx_data *tdata, const pj_str_t *name, const pj_str_t *value)
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{
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pjsip_generic_array_hdr *hdr;
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pj_bool_t created = PJ_FALSE;
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/* Create header, if not yet created. */
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hdr = pjsip_msg_find_hdr_by_name(tdata->msg, name, NULL);
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if (!hdr) {
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hdr = pjsip_generic_array_hdr_create(tdata->pool, name);
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created = PJ_TRUE;
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}
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if (!hdr) {
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ast_log(LOG_ERROR, "Failed to create header.");
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return;
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}
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if (hdr->count == PJSIP_GENERIC_ARRAY_MAX_COUNT) {
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ast_log(LOG_ERROR, "Too many evalue in array, skipping %s.", value->ptr);
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return;
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}
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pj_strdup(tdata->pool, &hdr->values[hdr->count++], value);
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/* Append header, if created. */
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if (created)
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pjsip_msg_add_hdr(tdata->msg, (pjsip_hdr *)hdr);
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}
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static pj_status_t on_tx_register_request(pjsip_tx_data *tdata)
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{
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if (!is_ims(tdata->msg))
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return PJ_SUCCESS;
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/* "Require: sec-agree" */
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add_value_array_hdr(tdata, &STR_REQUIRE, &STR_SEC_AGREE);
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/* "Proxy-Require: sec-agree" */
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add_value_string_hdr(tdata, &STR_PROXY_REQUIRE, &STR_SEC_AGREE);
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/* "Supported: path,sec-agree" */
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add_value_array_hdr(tdata, &STR_SUPPORTED, &STR_PATH);
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/* "Seciruty-Client: ..." */
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add_value_array_hdr(tdata, &STR_SUPPORTED, &STR_SEC_AGREE);
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add_securety_client_hdr(tdata, ipsec_alg, ipsec_ealg, 0xbea96586, 0x14ac7e17, 43419, 42318);
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#warning HACKING: Asterisk must do this on first register! Or we must do it!
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const pj_str_t STR_AUTHORIZATION = { "Authorization", 13 };
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char xxx[] = "Digest uri=\"sip:ims.mnc001.mcc238.3gppnetwork.org\",username=\"238010000090828@ims.mnc001.mcc238.3gppnetwork.org\",response=\"\",realm=\"ims.mnc001.mcc238.3gppnetwork.org\",nonce=\"\"";
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const pj_str_t STR_XXX = { xxx, strlen(xxx)};
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add_value_string_hdr(tdata, &STR_AUTHORIZATION, &STR_XXX);
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return PJ_SUCCESS;
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}
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/* What PJSIP will requests */
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static pj_status_t on_tx_request(pjsip_tx_data *tdata)
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{
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const pjsip_msg *msg = tdata->msg;
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puts("tx request");
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if (!msg) {
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ast_log(LOG_ERROR, "No message in request.");
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return PJ_CONSUME;
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}
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const pj_str_t REFER_TO = { "User-Agent", 10 };
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pjsip_generic_string_hdr *refer_to_hdr;
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switch (msg->line.req.method.id) {
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case PJSIP_REGISTER_METHOD:
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puts("register");
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return on_tx_register_request(tdata);
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break;
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case PJSIP_INVITE_METHOD:
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break;
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default:
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break;
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}
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return PJ_SUCCESS;
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}
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/* What response PJSIP receives */
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static pj_bool_t on_rx_response(pjsip_rx_data *rdata)
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{
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const pjsip_msg *msg = rdata->msg_info.msg;
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puts("rx response");
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if (!msg) {
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ast_log(LOG_ERROR, "No message in request.");
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return PJ_CONSUME;
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}
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const pj_str_t REFER_TO = { "Server", 6 };
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pjsip_generic_string_hdr *refer_to_hdr;
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refer_to_hdr = pjsip_msg_find_hdr_by_name(msg, &REFER_TO, NULL);
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printf("server=%s\n", refer_to_hdr->hvalue.ptr);
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printf("%d\n", msg->line.req.method.id);
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switch ((int)msg->line.req.method.id) {
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case 403:
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puts("forbidden");
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break;
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default:
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break;
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}
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return PJ_FALSE;
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}
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/* What request PJSIP receives */
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static pj_bool_t on_rx_request(pjsip_rx_data *rdata)
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{
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puts("rx request");
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return PJ_TRUE;
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}
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/* What PJSIP will response */
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static pj_status_t on_tx_response(pjsip_tx_data *tdata)
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{
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puts("tx response");
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return PJ_SUCCESS;
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}
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static pjsip_module volte_module = {
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.name = {"VoLTE Support Module", 18},
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.priority = PJSIP_MOD_PRIORITY_TRANSPORT_LAYER,
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.load = on_load,
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.on_tx_request = on_tx_request,
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.on_rx_response = on_rx_response,
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.on_tx_response = on_tx_response,
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.on_rx_request = on_rx_request,
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};
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static int load_module(void)
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{
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if (ast_sip_register_service(&volte_module) != PJ_SUCCESS) {
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ast_log(LOG_ERROR, "Failed to load VoLTE support module.\n");
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return AST_MODULE_LOAD_DECLINE;
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}
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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_unregister_service(&volte_module);
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return 0;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "VoLTE 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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