Description: Fixes multiplie channel variables with the same name
Author: Michael Goryainov <gms4nlt@gmail.com>

Fix for chan_sip and chan_iax2 drivers.
Also adds ability to print user variables in "iax2 show peer <peer>" output.
--- a/channels/chan_sip.c	2014-05-13 21:40:00.000000000 +0400
+++ b/channels/chan_sip.c	2014-05-30 19:20:42.084581700 +0400
@@ -30477,6 +30477,20 @@
 	
 	if ((varval = strchr(varname, '='))) {
 		*varval++ = '\0';
+		struct ast_variable *prev = NULL;
+		for (tmpvar = list; tmpvar; prev = tmpvar,tmpvar = tmpvar->next){
+			if(!strcmp(varname, tmpvar->name)) {
+    			/* for duplicate entries use last in the list */
+			    if(prev == NULL){
+				    list = tmpvar->next;
+				}else{
+				    prev->next = tmpvar->next;
+			    }
+			    free(tmpvar);
+			    break;
+			}
+		}
+		tmpvar = NULL;
 		if ((tmpvar = ast_variable_new(varname, varval, ""))) {
 			tmpvar->next = list;
 			list = tmpvar;
--- a/channels/chan_iax2.c	2014-05-10 02:28:40.000000000 +0400
+++ b/channels/chan_iax2.c	2014-06-06 12:51:44.790803834 +0400
@@ -540,6 +540,7 @@
 
 	struct ast_event_sub *mwi_event_sub;
 
+        struct ast_variable *vars;
 	struct ast_acl_list *acl;
 	enum calltoken_peer_enum calltoken_required;        /*!< Is calltoken validation required or not, can be YES, NO, or AUTO */
 };
@@ -3932,6 +3933,13 @@
 		ast_cli(a->fd, "  Addr->IP     : %s Port %d\n",  peer_addr.sin_addr.s_addr ? ast_inet_ntoa(peer_addr.sin_addr) : "(Unspecified)", ntohs(peer_addr.sin_port));
 		ast_cli(a->fd, "  Defaddr->IP  : %s Port %d\n", ast_inet_ntoa(peer->defaddr.sin_addr), ntohs(peer->defaddr.sin_port));
 		ast_cli(a->fd, "  Username     : %s\n", peer->username);
+                if (peer->vars) {
+                        ast_cli(a->fd, "  Variables    :\n");
+			struct ast_variable *v;
+                        for (v = peer->vars ; v ; v = v->next)
+                                ast_cli(a->fd, "                 %s = %s\n", v->name, v->value);
+                }
+
 		ast_cli(a->fd, "  Codecs       : ");
 		iax2_getformatname_multiple(codec_buf, sizeof(codec_buf) -1, peer->capability);
 		ast_cli(a->fd, "%s\n", codec_buf);
@@ -13031,6 +13039,29 @@
 				} else {
 					ast_log(LOG_WARNING, "requirecalltoken must be set to a valid value. at line %d\n", v->lineno);
 				}
+			} else if (!strcasecmp(v->name, "setvar")) {
+				char *varname = ast_strdupa(v->value);
+				char *varval;
+				if ((varval = strchr(varname, '='))) {
+					*varval++ = '\0';
+					struct ast_variable *cur = NULL,*prev = NULL,*tmpvar = NULL;
+					for (cur = peer->vars; cur; prev = cur,cur = cur->next){
+						if(!strcmp(varname, cur->name)) {
+					/* for duplicate entries use last in the user */
+							if(prev == NULL)
+								peer->vars = cur->next;
+						    	    else
+								prev->next = cur->next;
+							free(cur);
+							break;
+						}
+					}
+					if((tmpvar = ast_variable_new(varname, varval, ""))) {
+						tmpvar->next = peer->vars; 
+						peer->vars = tmpvar;
+					}
+				}
+
 			} /* else if (strcasecmp(v->name,"type")) */
 			/*	ast_log(LOG_WARNING, "Ignoring %s\n", v->name); */
 			v = v->next;
@@ -13159,8 +13190,19 @@
 			} else if (!strcasecmp(v->name, "setvar")) {
 				varname = ast_strdupa(v->value);
 				if ((varval = strchr(varname, '='))) {
-					*varval = '\0';
-					varval++;
+					*varval++ = '\0';
+					struct ast_variable *cur = NULL,*prev = NULL;
+					for (cur = user->vars; cur; prev = cur,cur = cur->next){
+						if(!strcmp(varname, cur->name)) {
+					/* for duplicate entries use last in the user */
+							if(prev == NULL)
+								user->vars = cur->next;
+						    	    else
+								prev->next = cur->next;
+							free(cur);
+							break;
+						}
+					}
 					if((tmpvar = ast_variable_new(varname, varval, ""))) {
 						tmpvar->next = user->vars; 
 						user->vars = tmpvar;