[sr-dev] git:master: modules_k/dialog: Provide new fix to prevent "unable to find

Module: sip-router Branch: master Commit: d1693b2c64dfc44f0271bdd1c38315578ebe7135 URL: http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=d1693b2… Author: Timo Reimann &lt;timo.reimann(a)1und1.de&gt; Committer: Timo Reimann &lt;timo.reimann(a)1und1.de&gt; Date: Thu Aug 5 17:48:30 2010 +0200 modules_k/dialog: Provide new fix to prevent "unable to find dialog" WARN messages caused by accessing a dialog in the "deleted" state (often happens with simultaneous BYE requests when both UAs hang up at the same time). This commit uses a different approach where a "deleted" flag is set in get_dlg() and lookup_dlg() which callers may evaluate. Callers who only care about existing dialogs can ignore the flag by passing a NULL argument. The commit "replaces" 9b7f25d7 and follows up 0723496c. --- modules_k/dialog/dialog.c | 4 ++-- modules_k/dialog/dlg_handlers.c | 20 +++++++++++++++++--- modules_k/dialog/dlg_hash.c | 22 +++++++++++++++++----- modules_k/dialog/dlg_hash.h | 6 ++++-- modules_k/dialog/dlg_req_within.c | 2 +- 5 files changed, 41 insertions(+), 13 deletions(-) diff --git a/modules_k/dialog/dialog.c b/modules_k/dialog/dialog.c index f965a06..0ca60b4 100644 --- a/modules_k/dialog/dialog.c +++ b/modules_k/dialog/dialog.c @@ -1064,7 +1064,7 @@ static int w_dlg_get(struct sip_msg *msg, char *ci, char *ft, char *tt) return -1; } - dlg = get_dlg(&sc, &sf, &st, &dir); + dlg = get_dlg(&sc, &sf, &st, &dir, NULL); if(dlg==NULL) return -1; current_dlg_pointer = dlg; @@ -1351,7 +1351,7 @@ static void rpc_end_dlg_entry_id(rpc_t *rpc, void *c) { if (rpc->scan(c, "ddS", &h_entry, &h_id, &rpc_extra_hdrs) < 2) return; - dlg = lookup_dlg(h_entry, h_id); + dlg = lookup_dlg(h_entry, h_id, NULL); if(dlg){ dlg_bye_all(dlg, (rpc_extra_hdrs.len>0)?&rpc_extra_hdrs:NULL); unref_dlg(dlg, 1); diff --git a/modules_k/dialog/dlg_handlers.c b/modules_k/dialog/dlg_handlers.c index 1e9a1b3..ef1e23f 100644 --- a/modules_k/dialog/dlg_handlers.c +++ b/modules_k/dialog/dlg_handlers.c @@ -542,6 +542,7 @@ void dlg_onreq(struct cell* t, int type, struct tmcb_params *param) str ftag; str ttag; unsigned int dir; + unsigned int del; struct sip_msg *req = param->req; if((req->flags&dlg_flag)!=dlg_flag) @@ -565,7 +566,11 @@ void dlg_onreq(struct cell* t, int type, struct tmcb_params *param) LM_WARN("pre-matching failed\n"); return; } - dlg = get_dlg(&callid, &ftag, &ttag, &dir); + dlg = get_dlg(&callid, &ftag, &ttag, &dir, &del); + if (del == 1) { + LM_DBG("dialog marked for deletion, ignoring\n"); + return; + } if (!dlg){ LM_DBG("Callid '%.*s' not found, must be a new dialog\n", req->callid->body.len, req->callid->body.s); @@ -837,6 +842,7 @@ void dlg_onroute(struct sip_msg* req, str *route_params, void *param) str val, callid, ftag, ttag; int h_entry, h_id, new_state, old_state, unref, event, timeout; unsigned int dir; + unsigned int del; int ret = 0; if (current_dlg_pointer!=NULL) @@ -865,7 +871,11 @@ void dlg_onroute(struct sip_msg* req, str *route_params, void *param) if ( parse_dlg_rr_param( val.s, val.s+val.len, &h_entry, &h_id)<0 ) return; - dlg = lookup_dlg( h_entry, h_id); + dlg = lookup_dlg( h_entry, h_id, &del); + if (del == 1) { + LM_DBG("dialog marked for deletion, ignoring\n"); + return; + } if (dlg==0) { LM_WARN("unable to find dialog for %.*s " "with route param '%.*s' [%u:%u]\n", @@ -913,7 +923,11 @@ void dlg_onroute(struct sip_msg* req, str *route_params, void *param) return; /* TODO - try to use the RR dir detection to speed up here the * search -bogdan */ - dlg = get_dlg(&callid, &ftag, &ttag, &dir); + dlg = get_dlg(&callid, &ftag, &ttag, &dir, &del); + if (del == 1) { + LM_DBG("dialog marked for deletion, ignoring\n"); + return; + } if (!dlg){ LM_DBG("Callid '%.*s' not found\n", req->callid->body.len, req->callid->body.s); diff --git a/modules_k/dialog/dlg_hash.c b/modules_k/dialog/dlg_hash.c index 6df21e3..58332a6 100644 --- a/modules_k/dialog/dlg_hash.c +++ b/modules_k/dialog/dlg_hash.c @@ -362,11 +362,14 @@ error: * \param h_id id of the hash table entry * \return dialog on success, NULL on failure */ -struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id) +struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id, unsigned int *del) { struct dlg_cell *dlg; struct dlg_entry *d_entry; + if (del != NULL) + *del = 0; + if (h_entry>=d_table->size) goto not_found; @@ -377,6 +380,8 @@ struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id) for( dlg=d_entry->first ; dlg ; dlg=dlg->next ) { if (dlg->h_id == h_id) { if (dlg->state==DLG_STATE_DELETED) { + if (del != NULL) + *del = 1; dlg_unlock( d_table, d_entry); goto not_found; } @@ -405,11 +410,15 @@ not_found: * \return dialog structure on success, NULL on failure */ static inline struct dlg_cell* internal_get_dlg(unsigned int h_entry, - str *callid, str *ftag, str *ttag, unsigned int *dir) + str *callid, str *ftag, str *ttag, unsigned int *dir, + unsigned int *del) { struct dlg_cell *dlg; struct dlg_entry *d_entry; + if (del != NULL) + *del = 0; + d_entry = &(d_table->entries[h_entry]); dlg_lock( d_table, d_entry); @@ -418,6 +427,8 @@ static inline struct dlg_cell* internal_get_dlg(unsigned int h_entry, /* Check callid / fromtag / totag */ if (match_dialog( dlg, callid, ftag, ttag, dir)==1) { if (dlg->state==DLG_STATE_DELETED) { + if (del != NULL) + *del = 1; dlg_unlock( d_table, d_entry); goto not_found; } @@ -453,14 +464,15 @@ not_found: * \param dir direction * \return dialog structure on success, NULL on failure */ -struct dlg_cell* get_dlg( str *callid, str *ftag, str *ttag, unsigned int *dir) +struct dlg_cell* get_dlg( str *callid, str *ftag, str *ttag, unsigned int *dir, + unsigned int *del) { struct dlg_cell *dlg; if ((dlg = internal_get_dlg(core_hash(callid, ftag->len?ftag:0, - d_table->size), callid, ftag, ttag, dir)) == 0 && + d_table->size), callid, ftag, ttag, dir, del)) == 0 && (dlg = internal_get_dlg(core_hash(callid, ttag->len - ?ttag:0, d_table->size), callid, ftag, ttag, dir)) == 0) { + ?ttag:0, d_table->size), callid, ftag, ttag, dir, del)) == 0) { LM_DBG("no dialog callid='%.*s' found\n", callid->len, callid->s); return 0; } diff --git a/modules_k/dialog/dlg_hash.h b/modules_k/dialog/dlg_hash.h index 889a318..e555837 100644 --- a/modules_k/dialog/dlg_hash.h +++ b/modules_k/dialog/dlg_hash.h @@ -243,9 +243,10 @@ int dlg_update_cseq(struct dlg_cell *dlg, unsigned int leg, str *cseq); * \brief Lookup a dialog in the global list * \param h_entry number of the hash table entry * \param h_id id of the hash table entry + * \param del unless null, flag that is set if dialog is in "deleted" state * \return dialog on success, NULL on failure */ -struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id); +struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id, unsigned int *del); /*! @@ -260,9 +261,10 @@ struct dlg_cell* lookup_dlg( unsigned int h_entry, unsigned int h_id); * \param ftag from tag * \param ttag to tag * \param dir direction + * \param del unless null, flag that is set if dialog is in "deleted" state * \return dialog structure on success, NULL on failure */ -struct dlg_cell* get_dlg(str *callid, str *ftag, str *ttag, unsigned int *dir); +struct dlg_cell* get_dlg(str *callid, str *ftag, str *ttag, unsigned int *dir, unsigned int *del); /*! diff --git a/modules_k/dialog/dlg_req_within.c b/modules_k/dialog/dlg_req_within.c index aae12fd..3b6c57d 100644 --- a/modules_k/dialog/dlg_req_within.c +++ b/modules_k/dialog/dlg_req_within.c @@ -317,7 +317,7 @@ struct mi_root * mi_terminate_dlg(struct mi_root *cmd_tree, void *param ){ LM_DBG("h_entry %u h_id %u\n", h_entry, h_id); - dlg = lookup_dlg(h_entry, h_id); + dlg = lookup_dlg(h_entry, h_id, NULL); // lookup_dlg has incremented the reference count