/**
* Compare media line protocols
*
* @param m SDP Media line
* @param proto Transport protocol
* @param update Update media protocol if match is found in alternate set
*
* @return True if matching, False if not
*/
bool sdp_media_proto_cmp(struct sdp_media *m, const struct pl *proto,
bool update)
{
unsigned i;
if (!m || !proto)
return false;
if (!pl_strcmp(proto, m->proto))
return true;
for (i=0; i<ARRAY_SIZE(m->protov); i++) {
if (!m->protov[i] || pl_strcmp(proto, m->protov[i]))
continue;
if (update) {
mem_deref(m->proto);
m->proto = mem_ref(m->protov[i]);
}
return true;
}
return false;
}
static int media_decode(struct sdp_media **mp, struct sdp_session *sess,
bool offer, const struct pl *pl)
{
struct pl name, port, proto, fmtv, fmt;
struct sdp_media *m;
int err;
if (re_regex(pl->p, pl->l, "[a-z]+ [^ ]+ [^ ]+[^]*",
&name, &port, &proto, &fmtv))
return EBADMSG;
m = list_ledata(*mp ? (*mp)->le.next : sess->medial.head);
if (!m) {
if (!offer)
return EPROTO;
m = sdp_media_find(sess, &name, &proto);
if (!m) {
err = sdp_media_radd(&m, sess, &name, &proto);
if (err)
return err;
}
else {
list_unlink(&m->le);
list_append(&sess->medial, &m->le, m);
}
}
else {
if (pl_strcmp(&name, m->name))
return offer ? ENOTSUP : EPROTO;
if (pl_strcmp(&proto, m->proto))
return ENOTSUP;
}
while (!re_regex(fmtv.p, fmtv.l, " [^ ]+", &fmt)) {
pl_advance(&fmtv, fmt.p + fmt.l - fmtv.p);
err = sdp_format_radd(m, &fmt);
if (err)
return err;
}
m->raddr = sess->raddr;
sa_set_port(&m->raddr, pl_u32(&port));
m->rdir = sess->rdir;
*mp = m;
return 0;
}
static bool cmp_handler(struct le *le, void *arg)
{
struct sip_ctrans *ct = le->data;
const struct sip_msg *msg = arg;
if (pl_strcmp(&msg->via.branch, ct->branch))
return false;
if (pl_strcmp(&msg->cseq.met, ct->met))
return false;
return true;
}
/**
* Compare a half SIP Dialog against a SIP Message
*
* @param dlg SIP Dialog
* @param msg SIP Message
*
* @return True if match, False if no match
*/
bool sip_dialog_cmp_half(const struct sip_dialog *dlg,
const struct sip_msg *msg)
{
if (!dlg || !msg)
return false;
if (pl_strcmp(&msg->callid, dlg->callid))
return false;
if (pl_strcmp(msg->req ? &msg->to.tag : &msg->from.tag, dlg->ltag))
return false;
return true;
}
static bool sdp_attr_handler(const char *name, const char *value, void *arg)
{
struct menc_st *st = arg;
struct crypto c;
(void)name;
if (sdes_decode_crypto(&c, value))
return false;
if (0 != pl_strcmp(&c.key_method, "inline"))
return false;
if (!cryptosuite_issupported(&c.suite))
return false;
st->crypto_suite = mem_deref(st->crypto_suite);
pl_strdup(&st->crypto_suite, &c.suite);
if (start_crypto(st, &c.key_info))
return false;
sdp_enc(st, st->sdpm, c.tag, st->crypto_suite);
return true;
}
static bool contact_handler(const struct sip_hdr *hdr,
const struct sip_msg *msg, void *arg)
{
struct sipreg *reg = arg;
struct sip_addr c;
struct pl pval;
char uri[256];
if (sip_addr_decode(&c, &hdr->val))
return false;
if (re_snprintf(uri, sizeof(uri), "sip:%s@%J%s", reg->cuser,
®->laddr, sip_transp_param(reg->tp)) < 0)
return false;
if (pl_strcmp(&c.auri, uri))
return false;
if (!sip_param_decode(&c.params, "expires", &pval)) {
reg->wait = pl_u32(&pval);
}
else if (pl_isset(&msg->expires))
reg->wait = pl_u32(&msg->expires);
else
reg->wait = DEFAULT_EXPIRES;
return true;
}
static void sip_recv(struct sip *sip, const struct sip_msg *msg)
{
struct le *le = sip->lsnrl.head;
while (le) {
struct sip_lsnr *lsnr = le->data;
le = le->next;
if (msg->req != lsnr->req)
continue;
if (lsnr->msgh(msg, lsnr->arg))
return;
}
if (msg->req) {
(void)re_fprintf(stderr, "unhandeled request from %J: %r %r\n",
&msg->src, &msg->met, &msg->ruri);
if (!pl_strcmp(&msg->met, "CANCEL"))
(void)sip_reply(sip, msg,
481, "Transaction Does Not Exist");
else
(void)sip_reply(sip, msg,
501, "Not Implemented");
}
else {
(void)re_fprintf(stderr, "unhandeled response from %J:"
" %u %r (%r)\n", &msg->src,
msg->scode, &msg->reason, &msg->cseq.met);
}
}
static bool request_handler(const struct sip_msg *msg, void *arg)
{
struct message *message = arg;
struct ua *ua;
struct le *le = message->lsnrl.head;
bool hdld = false;
if (pl_strcmp(&msg->met, "MESSAGE"))
return false;
ua = uag_find(&msg->uri.user);
if (!ua) {
(void)sip_treply(NULL, uag_sip(), msg, 404, "Not Found");
return true;
}
while (le) {
struct message_lsnr *lsnr = le->data;
le = le->next;
handle_message(lsnr, ua, msg);
hdld = true;
}
return hdld;
}
/**
* Find an SDP Media line from name and transport protocol
*
* @param sess SDP Session
* @param name Media name
* @param proto Transport protocol
* @param update_proto Update media transport protocol
*
* @return Matching media line if found, NULL if not found
*/
struct sdp_media *sdp_media_find(const struct sdp_session *sess,
const struct pl *name,
const struct pl *proto,
bool update_proto)
{
struct le *le;
if (!sess || !name || !proto)
return NULL;
for (le=sess->lmedial.head; le; le=le->next) {
struct sdp_media *m = le->data;
if (pl_strcmp(name, m->name))
continue;
if (!sdp_media_proto_cmp(m, proto, update_proto))
continue;
return m;
}
return NULL;
}
void http_init(struct httpc *app, struct request **rpp, char *str_uri)
{
int ok;
struct request *request;
struct pl pl_uri;
struct url url;
*rpp = NULL;
pl_uri.p = NULL;
str_dup((char**)&pl_uri.p, str_uri);
pl_uri.l = strlen(str_uri);
ok = url_decode(&url, &pl_uri);
if(ok!=0)
goto err_uri;
request = mem_zalloc(sizeof(*request), destructor);
ok = hash_alloc(&request->hdrht, HDR_HASH_SIZE);
request->err_h = dummy_err;
request->done_h = http_done;
request->post = NULL;
request->form = 0;
request->www_auth.p = NULL;
request->www_auth.l = 0;
request->auth = NULL;
request->retry = 0;
pl_strdup(&request->host, &url.host);
pl_strdup(&request->path, &url.path);
request->secure = !pl_strcmp(&url.scheme, "https");
memcpy(&request->meth, "GET", 4);
request->meth[4] = 0;
if(url.port)
request->port = url.port;
else
request->port = request->secure ? 443 : 80;
DEBUG_INFO("secure: %d port %d\n", request->secure, request->port);
sa_init(&request->dest, AF_INET);
ok = sa_set_str(&request->dest, request->host, request->port);
request->state = ok ? START : RESOLVED;
request->app = app;
*rpp = request;
err_uri:
if(pl_uri.p)
mem_deref((void*)pl_uri.p);
return;
}
/**
* Decode a pointer-length string into a SIP Via header
*
* @param via SIP Via header
* @param pl Pointer-length string
*
* @return 0 for success, otherwise errorcode
*/
int sip_via_decode(struct sip_via *via, const struct pl *pl)
{
struct pl transp, host, port;
int err;
if (!via || !pl)
return EINVAL;
err = re_regex(pl->p, pl->l,
"SIP[ \t\r\n]*/[ \t\r\n]*2.0[ \t\r\n]*/[ \t\r\n]*"
"[A-Z]+[ \t\r\n]*[^; \t\r\n]+[ \t\r\n]*[^]*",
NULL, NULL, NULL, NULL, &transp,
NULL, &via->sentby, NULL, &via->params);
if (err)
return err;
if (!pl_strcmp(&transp, "TCP"))
via->tp = SIP_TRANSP_TCP;
else if (!pl_strcmp(&transp, "TLS"))
via->tp = SIP_TRANSP_TLS;
else if (!pl_strcmp(&transp, "UDP"))
via->tp = SIP_TRANSP_UDP;
else
via->tp = SIP_TRANSP_NONE;
err = decode_hostport(&via->sentby, &host, &port);
if (err)
return err;
sa_init(&via->addr, AF_INET);
(void)sa_set(&via->addr, &host, 0);
if (pl_isset(&port))
sa_set_port(&via->addr, pl_u32(&port));
via->val = *pl;
return msg_param_decode(&via->params, "branch", &via->branch);
}
static bool response_handler(const struct sip_msg *msg, void *arg)
{
struct sipsess_sock *sock = arg;
if (pl_strcmp(&msg->cseq.met, "INVITE"))
return false;
if (msg->scode < 200 || msg->scode > 299)
return false;
(void)sipsess_ack_again(sock, msg);
return true;
}
static bool amr_octet_align(const char *fmtp)
{
struct pl pl, oa;
if (!fmtp)
return false;
pl_set_str(&pl, fmtp);
if (fmt_param_get(&pl, "octet-align", &oa))
return 0 == pl_strcmp(&oa, "1");
return false;
}
static bool request_handler(const struct sip_msg *msg, void *arg)
{
struct sipsess_sock *sock = arg;
if (!pl_strcmp(&msg->met, "INVITE")) {
if (pl_isset(&msg->to.tag))
reinvite_handler(sock, msg);
else
invite_handler(sock, msg);
return true;
}
else if (!pl_strcmp(&msg->met, "ACK")) {
ack_handler(sock, msg);
return true;
}
else if (!pl_strcmp(&msg->met, "BYE")) {
bye_handler(sock, msg);
return true;
}
else if (!pl_strcmp(&msg->met, "INFO")) {
info_handler(sock, msg);
return true;
}
else if (!pl_strcmp(&msg->met, "REFER")) {
if (!pl_isset(&msg->to.tag))
return false;
refer_handler(sock, msg);
return true;
}
return false;
}
static int bandwidth_decode(int32_t *bwv, const struct pl *pl)
{
struct pl type, bw;
if (re_regex(pl->p, pl->l, "[^:]+:[0-9]+", &type, &bw))
return EBADMSG;
if (!pl_strcmp(&type, "CT"))
bwv[SDP_BANDWIDTH_CT] = pl_u32(&bw);
else if (!pl_strcmp(&type, "AS"))
bwv[SDP_BANDWIDTH_AS] = pl_u32(&bw);
else if (!pl_strcmp(&type, "RS"))
bwv[SDP_BANDWIDTH_RS] = pl_u32(&bw);
else if (!pl_strcmp(&type, "RR"))
bwv[SDP_BANDWIDTH_RR] = pl_u32(&bw);
else if (!pl_strcmp(&type, "TIAS"))
bwv[SDP_BANDWIDTH_TIAS] = pl_u32(&bw);
return 0;
}
static bool request_handler(const struct sip_msg *msg, void *arg)
{
struct ua *ua;
(void)arg;
if (pl_strcmp(&msg->met, "MESSAGE"))
return false;
ua = uag_find(&msg->uri.user);
if (!ua) {
(void)sip_treply(NULL, uag_sip(), msg, 404, "Not Found");
return true;
}
handle_message(ua, msg);
return true;
}
struct sdp_format *sdp_format_find(const struct list *lst, const struct pl *id)
{
struct le *le;
if (!lst || !id)
return NULL;
for (le=lst->head; le; le=le->next) {
struct sdp_format *fmt = le->data;
if (pl_strcmp(id, fmt->id))
continue;
return fmt;
}
return NULL;
}
void http_request_h(struct http_conn *conn, const struct http_msg *msg, void *arg)
{
int err;
enum app_cmd cmd;
const struct http_hdr * expect_hdr;
struct mbuf *mb = msg->mb;
uint8_t *ret_buf;
size_t ret_len;
if(pl_strcmp(&msg->met, "POST")) {
http_creply(conn, 405, "Method not allowed", "text/plain", "EMET");
return;
}
expect_hdr = http_msg_hdr(msg, HTTP_HDR_EXPECT);
if(expect_hdr != NULL && version_cmp(version, &expect_hdr->val) < 0) {
http_creply(conn, 417, "Expectation Failed", "text/plain", "%s", version);
return;
}
cmd = (enum app_cmd)(hash_joaat_ci(msg->path.p, msg->path.l) & 0xfff);
err = app_handle(cmd, mbuf_buf(mb), mbuf_get_left(mb), &ret_buf, &ret_len);
if(err < 0) {
http_creply(conn, 500, "Internal Server Error", "text/plain", "EINT");
return;
}
if(err > 200) {
http_creply(conn, err, "Error", "text/plain", "NO", 2);
return;
}
if(err == 0) {
http_creply(conn, 200, "OK", "text/plain; charset=utf-8", "%b", ret_buf, ret_len);
} else {
http_creply(conn, 403, "Forbidden", "text/plain", "%b", ret_buf, ret_len);
}
free(ret_buf);
}
static void udp_recv(const struct sa *src, struct mbuf *mb, void *arg)
{
struct sip_server *srv = arg;
struct sip_msg *msg;
int err;
#if 0
re_printf("sip: %zu bytes from %J\n", mbuf_get_left(mb), src);
re_printf("%b\n", mb->buf, mb->end);
#endif
err = sip_msg_decode(&msg, mb);
if (err) {
warning("selftest: sip_msg_decode: %m\n", err);
return;
}
if (0 == pl_strcmp(&msg->met, "REGISTER"))
srv->got_register_req = true;
msg->sock = mem_ref(srv->us);
msg->src = *src;
msg->dst = srv->laddr;
msg->tp = SIP_TRANSP_UDP;
if (srv->terminate)
err = sip_reply(srv->sip, msg, 503, "Server Error");
else
err = sip_reply(srv->sip, msg, 200, "OK");
if (err) {
warning("selftest: could not reply: %m\n", err);
}
mem_deref(msg);
if (srv->terminate)
re_cancel();
}
static int attr_decode(struct sdp_session *sess, struct sdp_media *m,
enum sdp_dir *dir, const struct pl *pl)
{
struct pl name, val;
int err = 0;
if (re_regex(pl->p, pl->l, "[^:]+:[^]+", &name, &val)) {
name = *pl;
val = pl_null;
}
if (!pl_strcmp(&name, "fmtp"))
err = attr_decode_fmtp(m, &val);
else if (!pl_strcmp(&name, "inactive"))
*dir = SDP_INACTIVE;
else if (!pl_strcmp(&name, "recvonly"))
*dir = SDP_SENDONLY;
else if (!pl_strcmp(&name, "rtcp"))
err = attr_decode_rtcp(m, &val);
else if (!pl_strcmp(&name, "rtpmap"))
err = attr_decode_rtpmap(m, &val);
else if (!pl_strcmp(&name, "sendonly"))
*dir = SDP_RECVONLY;
else if (!pl_strcmp(&name, "sendrecv"))
*dir = SDP_SENDRECV;
else
err = sdp_attr_add(m ? &m->rattrl : &sess->rattrl,
&name, &val);
return err;
}
static bool find_handler(struct le *le, void *arg)
{
struct contact *c = le->data;
return 0 == pl_strcmp(&c->addr.auri, arg);
}
static void notify_handler(struct sip *sip, const struct sip_msg *msg,
void *arg)
{
enum presence_status status = PRESENCE_CLOSED;
struct presence *pres = arg;
const struct sip_hdr *type_hdr, *length_hdr;
struct pl pl;
pres->failc = 0;
type_hdr = sip_msg_hdr(msg, SIP_HDR_CONTENT_TYPE);
if (!type_hdr) {
length_hdr = sip_msg_hdr(msg, SIP_HDR_CONTENT_LENGTH);
if (0 == pl_strcmp(&length_hdr->val, "0")) {
status = PRESENCE_UNKNOWN;
goto done;
}
}
if (!type_hdr ||
0 != pl_strcasecmp(&type_hdr->val, "application/pidf+xml")) {
if (type_hdr)
warning("presence: unsupported content-type: '%r'\n",
&type_hdr->val);
sip_treplyf(NULL, NULL, sip, msg, false,
415, "Unsupported Media Type",
"Accept: application/pidf+xml\r\n"
"Content-Length: 0\r\n"
"\r\n");
return;
}
if (!re_regex((const char *)mbuf_buf(msg->mb), mbuf_get_left(msg->mb),
"<basic>[^<]+</basic>", &pl)) {
if (!pl_strcasecmp(&pl, "open"))
status = PRESENCE_OPEN;
}
if (!re_regex((const char *)mbuf_buf(msg->mb), mbuf_get_left(msg->mb),
"<rpid:away/>")) {
status = PRESENCE_CLOSED;
}
else if (!re_regex((const char *)mbuf_buf(msg->mb),
mbuf_get_left(msg->mb),
"<rpid:busy/>")) {
status = PRESENCE_BUSY;
}
else if (!re_regex((const char *)mbuf_buf(msg->mb),
mbuf_get_left(msg->mb),
"<rpid:on-the-phone/>")) {
status = PRESENCE_BUSY;
}
done:
(void)sip_treply(NULL, sip, msg, 200, "OK");
contact_set_presence(pres->contact, status);
}
int sipevent_accept(struct sipnot **notp, struct sipevent_sock *sock,
const struct sip_msg *msg, struct sip_dialog *dlg,
const struct sipevent_event *event,
uint16_t scode, const char *reason, uint32_t expires_min,
uint32_t expires_dfl, uint32_t expires_max,
const char *cuser, const char *ctype,
sip_auth_h *authh, void *aarg, bool aref,
sipnot_close_h *closeh, void *arg, const char *fmt, ...)
{
struct sipnot *not;
uint32_t expires;
int err;
if (!notp || !sock || !msg || !scode || !reason || !expires_dfl ||
!expires_max || !cuser || !ctype || expires_dfl < expires_min)
return EINVAL;
not = mem_zalloc(sizeof(*not), destructor);
if (!not)
return ENOMEM;
if (!pl_strcmp(&msg->met, "REFER")) {
err = str_dup(¬->event, "refer");
if (err)
goto out;
err = re_sdprintf(¬->id, "%u", msg->cseq.num);
if (err)
goto out;
}
else {
if (!event) {
err = EINVAL;
goto out;
}
err = pl_strdup(¬->event, &event->event);
if (err)
goto out;
if (pl_isset(&event->id)) {
err = pl_strdup(¬->id, &event->id);
if (err)
goto out;
}
}
if (dlg) {
not->dlg = mem_ref(dlg);
}
else {
err = sip_dialog_accept(¬->dlg, msg);
if (err)
goto out;
}
hash_append(sock->ht_not,
hash_joaat_str(sip_dialog_callid(not->dlg)),
¬->he, not);
err = sip_auth_alloc(¬->auth, authh, aarg, aref);
if (err)
goto out;
err = str_dup(¬->cuser, cuser);
if (err)
goto out;
err = str_dup(¬->ctype, ctype);
if (err)
goto out;
if (fmt) {
va_list ap;
va_start(ap, fmt);
err = re_vsdprintf(¬->hdrs, fmt, ap);
va_end(ap);
if (err)
goto out;
}
not->expires_min = expires_min;
not->expires_dfl = expires_dfl;
not->expires_max = expires_max;
not->substate = SIPEVENT_PENDING;
not->sock = mem_ref(sock);
not->sip = mem_ref(sock->sip);
not->closeh = closeh ? closeh : internal_close_handler;
not->arg = arg;
if (pl_isset(&msg->expires))
expires = pl_u32(&msg->expires);
else
expires = not->expires_dfl;
sipnot_refresh(not, expires);
err = sipnot_reply(not, msg, scode, reason);
if (err)
goto out;
not->subscribed = true;
out:
if (err)
mem_deref(not);
else
*notp = not;
return err;
}
int trice_stund_recv(struct trice *icem, struct ice_lcand *lcand,
void *sock, const struct sa *src,
struct stun_msg *req, size_t presz)
{
struct stun_attr *attr;
struct pl lu, ru;
bool remote_controlling;
uint64_t tiebrk = 0;
uint32_t prio_prflx;
bool use_cand = false;
int err;
/* RFC 5389: Fingerprint errors are silently discarded */
err = stun_msg_chk_fingerprint(req);
if (err)
return err;
err = stun_msg_chk_mi(req, (uint8_t *)icem->lpwd, strlen(icem->lpwd));
if (err) {
DEBUG_WARNING("message-integrity failed (src=%J)\n", src);
if (err == EBADMSG)
goto unauth;
else
goto badmsg;
}
attr = stun_msg_attr(req, STUN_ATTR_USERNAME);
if (!attr)
goto badmsg;
err = re_regex(attr->v.username, strlen(attr->v.username),
"[^:]+:[^]+", &lu, &ru);
if (err) {
DEBUG_WARNING("could not parse USERNAME attribute (%s)\n",
attr->v.username);
goto unauth;
}
if (pl_strcmp(&lu, icem->lufrag)) {
DEBUG_WARNING("local ufrag err (expected %s, actual %r)\n",
icem->lufrag, &lu);
goto unauth;
}
if (str_isset(icem->rufrag) && pl_strcmp(&ru, icem->rufrag)) {
DEBUG_WARNING("remote ufrag err (expected %s, actual %r)\n",
icem->rufrag, &ru);
goto unauth;
}
attr = stun_msg_attr(req, STUN_ATTR_CONTROLLED);
if (attr) {
remote_controlling = false;
tiebrk = attr->v.uint64;
}
attr = stun_msg_attr(req, STUN_ATTR_CONTROLLING);
if (attr) {
remote_controlling = true;
tiebrk = attr->v.uint64;
}
if (remote_controlling == icem->controlling) {
if (icem->tiebrk >= tiebrk)
trice_switch_local_role(icem);
else
goto conflict;
}
attr = stun_msg_attr(req, STUN_ATTR_PRIORITY);
if (attr)
prio_prflx = attr->v.uint32;
else
goto badmsg;
attr = stun_msg_attr(req, STUN_ATTR_USE_CAND);
if (attr)
use_cand = true;
err = handle_stun_full(icem, lcand, sock, src, prio_prflx, use_cand);
if (err)
goto badmsg;
trice_tracef(icem, 32,
"[%u] STUNSRV: Tx success respons [%H ---> %J]\n",
lcand->attr.compid,
trice_cand_print, lcand, src);
return stun_reply(lcand->attr.proto, sock, src, presz, req,
(uint8_t *)icem->lpwd, strlen(icem->lpwd), true, 2,
STUN_ATTR_XOR_MAPPED_ADDR, src,
STUN_ATTR_SOFTWARE, icem->sw ? icem->sw : sw);
badmsg:
return stunsrv_ereply(icem, lcand, sock, src, presz, req,
400, "Bad Request");
unauth:
return stunsrv_ereply(icem, lcand, sock, src, presz, req,
401, "Unauthorized");
conflict:
return stunsrv_ereply(icem, lcand, sock, src, presz, req,
487, "Role Conflict");
}
int location_update(struct list *locl, const struct sip_msg *msg,
const struct sip_addr *contact, uint32_t expires)
{
struct location *loc, *loc_new = NULL;
struct loctmp *tmp;
struct pl pl;
int err;
if (!locl || !msg || !contact)
return EINVAL;
loc = list_ledata(list_apply(locl, true, cmp_handler,
(void *)&contact->uri));
if (!loc) {
if (expires == 0)
return 0;
loc = loc_new = mem_zalloc(sizeof(*loc), destructor_location);
if (!loc)
return ENOMEM;
list_append(locl, &loc->le, loc);
}
else {
if (!pl_strcmp(&msg->callid, loc->callid) &&
msg->cseq.num <= loc->cseq)
return EPROTO;
if (expires == 0) {
loc->rm = true;
return 0;
}
}
tmp = mem_zalloc(sizeof(*tmp), destructor_loctmp);
if (!tmp) {
err = ENOMEM;
goto out;
}
err = pl_strdup(&tmp->uri, &contact->auri);
if (err)
goto out;
pl_set_str(&pl, tmp->uri);
if (uri_decode(&tmp->duri, &pl)) {
err = EBADMSG;
goto out;
}
err = pl_strdup(&tmp->callid, &msg->callid);
if (err)
goto out;
if (!msg_param_decode(&contact->params, "q", &pl))
tmp->q = pl_float(&pl);
else
tmp->q = 1;
tmp->cseq = msg->cseq.num;
tmp->expires = expires;
tmp->src = msg->src;
out:
if (err) {
mem_deref(loc_new);
mem_deref(tmp);
}
else {
mem_deref(loc->tmp);
loc->tmp = tmp;
}
return err;
}
static int version_decode(const struct pl *pl)
{
return pl_strcmp(pl, "0") ? ENOSYS : 0;
}
int icem_stund_recv(struct icem_comp *comp, const struct sa *src,
struct stun_msg *req, size_t presz)
{
struct icem *icem = comp->icem;
struct ice *ice = icem->ice;
struct stun_attr *attr;
struct pl lu, ru;
enum role rrole = ROLE_UNKNOWN;
uint64_t tiebrk = 0;
uint32_t prio_prflx;
bool use_cand = false;
int err;
/* RFC 5389: Fingerprint errors are silently discarded */
err = stun_msg_chk_fingerprint(req);
if (err)
return err;
err = stun_msg_chk_mi(req, (uint8_t *)ice->lpwd, strlen(ice->lpwd));
if (err) {
if (err == EBADMSG)
goto unauth;
else
goto badmsg;
}
attr = stun_msg_attr(req, STUN_ATTR_USERNAME);
if (!attr)
goto badmsg;
err = re_regex(attr->v.username, strlen(attr->v.username),
"[^:]+:[^]+", &lu, &ru);
if (err) {
DEBUG_WARNING("could not parse USERNAME attribute (%s)\n",
attr->v.username);
goto unauth;
}
if (pl_strcmp(&lu, ice->lufrag))
goto unauth;
if (str_isset(icem->rufrag) && pl_strcmp(&ru, icem->rufrag))
goto unauth;
attr = stun_msg_attr(req, STUN_ATTR_CONTROLLED);
if (attr) {
rrole = ROLE_CONTROLLED;
tiebrk = attr->v.uint64;
}
attr = stun_msg_attr(req, STUN_ATTR_CONTROLLING);
if (attr) {
rrole = ROLE_CONTROLLING;
tiebrk = attr->v.uint64;
}
if (rrole == ice->lrole) {
if (ice->tiebrk >= tiebrk)
ice_switch_local_role(ice);
else
goto conflict;
}
attr = stun_msg_attr(req, STUN_ATTR_PRIORITY);
if (attr)
prio_prflx = attr->v.uint32;
else
goto badmsg;
attr = stun_msg_attr(req, STUN_ATTR_USE_CAND);
if (attr)
use_cand = true;
err = handle_stun(ice, icem, comp, src, prio_prflx,
use_cand, presz > 0);
if (err)
goto badmsg;
return stun_reply(icem->proto, comp->sock, src, presz, req,
(uint8_t *)ice->lpwd, strlen(ice->lpwd), true, 2,
STUN_ATTR_XOR_MAPPED_ADDR, src,
STUN_ATTR_SOFTWARE, sw);
badmsg:
return stunsrv_ereply(comp, src, presz, req, 400, "Bad Request");
unauth:
return stunsrv_ereply(comp, src, presz, req, 401, "Unauthorized");
conflict:
return stunsrv_ereply(comp, src, presz, req, 487, "Role Conflict");
}
/**
* Decode a SIP message
*
* @param msgp Pointer to allocated SIP Message
* @param mb Buffer containing SIP Message
*
* @return 0 if success, otherwise errorcode
*/
int sip_msg_decode(struct sip_msg **msgp, struct mbuf *mb)
{
struct pl x, y, z, e, name;
const char *p, *v, *cv;
struct sip_msg *msg;
bool comsep, quote;
enum sip_hdrid id = SIP_HDR_NONE;
uint32_t ws, lf;
size_t l;
int err;
if (!msgp || !mb)
return EINVAL;
p = (const char *)mbuf_buf(mb);
l = mbuf_get_left(mb);
if (re_regex(p, l, "[^ \t\r\n]+ [^ \t\r\n]+ [^\r\n]*[\r]*[\n]1",
&x, &y, &z, NULL, &e) || x.p != (char *)mbuf_buf(mb))
return (l > STARTLINE_MAX) ? EBADMSG : ENODATA;
msg = mem_zalloc(sizeof(*msg), destructor);
if (!msg)
return ENOMEM;
err = hash_alloc(&msg->hdrht, HDR_HASH_SIZE);
if (err)
goto out;
msg->tag = rand_u64();
msg->mb = mem_ref(mb);
msg->req = (0 == pl_strcmp(&z, "SIP/2.0"));
if (msg->req) {
msg->met = x;
msg->ruri = y;
msg->ver = z;
if (uri_decode(&msg->uri, &y)) {
err = EBADMSG;
goto out;
}
}
else {
msg->ver = x;
msg->scode = pl_u32(&y);
msg->reason = z;
if (!msg->scode) {
err = EBADMSG;
goto out;
}
}
l -= e.p + e.l - p;
p = e.p + e.l;
name.p = v = cv = NULL;
name.l = ws = lf = 0;
comsep = false;
quote = false;
for (; l > 0; p++, l--) {
switch (*p) {
case ' ':
case '\t':
lf = 0; /* folding */
++ws;
break;
case '\r':
++ws;
break;
case '\n':
++ws;
if (!lf++)
break;
++p; --l; /* eoh */
/*@fallthrough@*/
default:
if (lf || (*p == ',' && comsep && !quote)) {
if (!name.l) {
err = EBADMSG;
goto out;
}
err = hdr_add(msg, &name, id, cv ? cv : p,
cv ? p - cv - ws : 0,
true, cv == v && lf);
if (err)
goto out;
if (!lf) { /* comma separated */
cv = NULL;
break;
}
if (cv != v) {
err = hdr_add(msg, &name, id,
v ? v : p,
v ? p - v - ws : 0,
false, true);
if (err)
goto out;
}
if (lf > 1) { /* eoh */
err = 0;
goto out;
}
comsep = false;
name.p = NULL;
cv = v = NULL;
lf = 0;
}
if (!name.p) {
name.p = p;
name.l = 0;
ws = 0;
}
if (!name.l) {
if (*p != ':') {
ws = 0;
break;
}
name.l = MAX((int)(p - name.p - ws), 0);
if (!name.l) {
err = EBADMSG;
goto out;
}
id = hdr_hash(&name);
comsep = hdr_comma_separated(id);
break;
}
if (!cv) {
quote = false;
cv = p;
}
if (!v) {
v = p;
}
if (*p == '"')
quote = !quote;
ws = 0;
break;
}
}
err = ENODATA;
out:
if (err)
mem_deref(msg);
else {
*msgp = msg;
mb->pos = mb->end - l;
}
return err;
}
