[sr-dev] git:master: nathelper(k): hanlde sip ping replies
Daniel-Constantin Mierla
miconda at gmail.com
Sun Aug 19 21:30:33 CEST 2012
Module: sip-router
Branch: master
Commit: a308226ced8b9807ee91f8e24c72d778e5a62e86
URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=a308226ced8b9807ee91f8e24c72d778e5a62e86
Author: Daniel-Constantin Mierla <miconda at gmail.com>
Committer: Daniel-Constantin Mierla <miconda at gmail.com>
Date: Sun Aug 19 12:56:24 2012 +0200
nathelper(k): hanlde sip ping replies
- new parameter 'keepalive_timeout' to detect if a contact does not
reply to sip ping requests
- default is 0 (feature disabled) - it should be few times more than
natping_interval
---
modules_k/nathelper/nathelper.c | 123 +++++++++++++++++++++++++++++++++++++-
modules_k/nathelper/sip_pinger.h | 2 +-
2 files changed, 123 insertions(+), 2 deletions(-)
diff --git a/modules_k/nathelper/nathelper.c b/modules_k/nathelper/nathelper.c
index e5bfc89..c27d073 100644
--- a/modules_k/nathelper/nathelper.c
+++ b/modules_k/nathelper/nathelper.c
@@ -203,6 +203,7 @@
#include "../../parser/parse_to.h"
#include "../../parser/parse_uri.h"
#include "../../parser/parser_f.h"
+#include "../../parser/parse_methods.h"
#include "../../parser/sdp/sdp.h"
#include "../../resolve.h"
#include "../../timer.h"
@@ -295,6 +296,7 @@ static int fix_nated_register_f(struct sip_msg *, char *, char *);
static int fixup_fix_nated_register(void** param, int param_no);
static int fixup_fix_sdp(void** param, int param_no);
static int add_rcv_param_f(struct sip_msg *, char *, char *);
+static int nh_sip_reply_received(sip_msg_t *msg);
static void nh_timer(unsigned int, void *);
static int mod_init(void);
@@ -345,6 +347,8 @@ static char *natping_socket = 0;
static int raw_sock = -1;
static unsigned int raw_ip = 0;
static unsigned short raw_port = 0;
+static int nh_keepalive_timeout = 0;
+static request_method_t sipping_method_id = 0;
/*0-> disabled, 1 ->enabled*/
@@ -403,6 +407,8 @@ static param_export_t params[] = {
{"sipping_bflag", INT_PARAM, &sipping_flag },
{"natping_processes", INT_PARAM, &natping_processes },
{"natping_socket", STR_PARAM, &natping_socket },
+ {"keepalive_timeout", INT_PARAM, &nh_keepalive_timeout },
+
{0, 0, 0}
};
@@ -422,7 +428,7 @@ struct module_exports exports = {
mod_pvs, /* exported pseudo-variables */
0, /* extra processes */
mod_init,
- 0, /* reply processing */
+ nh_sip_reply_received, /* reply processing */
mod_destroy, /* destroy function */
child_init
};
@@ -646,7 +652,16 @@ mod_init(void)
LM_ERR("SIP ping enabled, but SIP ping method is empty!\n");
return -1;
}
+ if(nh_keepalive_timeout>0 && ul.set_keepalive_timeout!=NULL) {
+ ul.set_keepalive_timeout(nh_keepalive_timeout);
+ }
+
sipping_method.len = strlen(sipping_method.s);
+ if(parse_method_name(&sipping_method, &sipping_method_id) < 0) {
+ LM_ERR("invalid SIP ping method [%.*s]!\n", sipping_method.len,
+ sipping_method.s);
+ return -1;
+ }
sipping_from.len = strlen(sipping_from.s);
exports.response_f = sipping_rpl_filter;
init_sip_ping();
@@ -2000,3 +2015,109 @@ fix_nated_register_f(struct sip_msg* msg, char* str1, char* str2)
return 1;
}
+
+/**
+ * handle SIP replies
+ */
+static int nh_sip_reply_received(sip_msg_t *msg)
+{
+ to_body_t *fb;
+ str ruid;
+ str ah;
+ unsigned int aorhash;
+ char *p;
+
+ if(nh_keepalive_timeout<=0)
+ return 1;
+ if(msg->cseq==NULL && ((parse_headers(msg, HDR_CSEQ_F, 0)==-1)
+ || (msg->cseq==NULL)))
+ {
+ LM_ERR("no CSEQ header\n");
+ goto done;
+ }
+ if(sipping_method_id!=METHOD_UNDEF && sipping_method_id!=METHOD_OTHER)
+ {
+ if(get_cseq(msg)->method_id!=sipping_method_id)
+ goto done;
+ } else {
+ if(sipping_method_id==METHOD_OTHER)
+ {
+ if(get_cseq(msg)->method.len!=sipping_method.len)
+ goto done;
+ if(strncmp(get_cseq(msg)->method.s, sipping_method.s,
+ sipping_method.len)!=0)
+ goto done;
+ } else {
+ goto done;
+ }
+ }
+ /* there must be no second via */
+ if ( ! (parse_headers(msg, HDR_VIA2_F, 0)==-1
+ || (msg->via2==0) || (msg->via2->error!=PARSE_OK)) )
+ goto done;
+
+ /* from uri check */
+ if((parse_from_header(msg))<0)
+ {
+ LM_ERR("cannot parse From header\n");
+ goto done;
+ }
+
+ fb = get_from(msg);
+ if(fb->uri.len!=sipping_from.len
+ || strncmp(fb->uri.s, sipping_from.s, sipping_from.len)!=0)
+ goto done;
+
+ /* from-tag is: ruid-aorhash-counter */
+ if(fb->tag_value.len<=0)
+ goto done;
+
+ LM_DBG("checking nathelper keepalive reply [%.*s]\n", fb->tag_value.len,
+ fb->tag_value.s);
+
+ /* skip counter */
+ p = q_memrchr(fb->tag_value.s, '-', fb->tag_value.len);
+ if(p==NULL) {
+ LM_DBG("from tag format mismatch [%.*s]\n", fb->tag_value.len,
+ fb->tag_value.s);
+ goto done;
+ }
+ /* aor hash */
+ ah.len = p - fb->tag_value.s;
+ aorhash = 0;
+ p = q_memrchr(fb->tag_value.s, '-', ah.len);
+ if(p==NULL) {
+ LM_DBG("from tag format mismatch [%.*s]!\n", fb->tag_value.len,
+ fb->tag_value.s);
+ goto done;
+ }
+ ah.s = p + 1;
+ ah.len = fb->tag_value.s + ah.len - ah.s;
+
+ LM_DBG("aor hash string is [%.*s] (%d)\n", ah.len, ah.s, ah.len);
+
+ if(ah.len<=0 || reverse_hex2int(ah.s, ah.len, &aorhash)<0)
+ {
+ LM_DBG("cannot get aor hash in [%.*s]\n", fb->tag_value.len,
+ fb->tag_value.s);
+ goto done;
+ }
+ LM_DBG("aor hash is [%u] string [%.*s]\n", aorhash, ah.len, ah.s);
+
+ ruid.s = fb->tag_value.s;
+ ruid.len = ah.s - ruid.s - 1;
+
+ if(ruid.len<=0)
+ {
+ LM_DBG("cannot get ruid in [%.*s]\n", fb->tag_value.len,
+ fb->tag_value.s);
+ goto done;
+ }
+
+ LM_DBG("reply for keepalive of [%.*s:%u]\n", ruid.len, ruid.s, aorhash);
+
+ ul.refresh_keepalive(aorhash, &ruid);
+done:
+ /* let the core handle further the reply */
+ return 1;
+}
diff --git a/modules_k/nathelper/sip_pinger.h b/modules_k/nathelper/sip_pinger.h
index c6098b3..dce4bd8 100644
--- a/modules_k/nathelper/sip_pinger.h
+++ b/modules_k/nathelper/sip_pinger.h
@@ -129,7 +129,7 @@ static inline char* build_sipping(str *curi, struct socket_info* s, str *path,
1 + s->port_no_str.len + s_len(";branch=0") +
(path->len ? (s_len(CRLF"Route: ") + path->len) : 0) +
s_len(CRLF"From: ") + sipping_from.len + s_len(";tag=") +
- sipping_from.len + 1 + 8 + 1 + 8 +
+ ruid->len + 1 + 8 + 1 + 8 +
s_len(CRLF"To: ") + curi->len +
s_len(CRLF"Call-ID: ") + sipping_callid.len + 1 + 8 + 1 + 8 + 1 +
s->address_str.len +
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