[call_center] fix overflowing the per-agent array of skills

As the array of skills is pre-allocated inside the agent struct, be sure you do not overflow it when populating the agent's skills (from DB).
Also, the logstate/logged_in value for an agent is read from DB or MI and it must be forced to 0/1 values, as it is later used as index. Yet another overflow fixed here.

(cherry picked from commit 6617ecc)

modules/call_center/call_center.c

@@ -1873,6 +1873,7 @@ static mi_response_t *mi_agent_login(const mi_params_t *params,
 
 	if (get_mi_int_param(params, "state", &logged_in) < 0)
 		return init_mi_param_error();
+	logged_in = logged_in ? 1 : 0;
 
 	/* block access to data */
 	lock_get( data->lock );

modules/call_center/cc_data.c

@@ -522,6 +522,7 @@ int add_cc_agent( struct cc_data *data, str *id, struct media_info *media,
 
 	/* is the agent a new one? - search by ID */
 	agent = get_agent_by_name( data, id, &prev_agent);
+	logstate = logstate ? 1 : 0;
 
 	if (agent==NULL) {
 		/* new agent -> create and populate one */
@@ -572,18 +573,27 @@ int add_cc_agent( struct cc_data *data, str *id, struct media_info *media,
 		if (skills && skills->len) {
 			p = skills->s;
 			while (p) {
+				if (agent->no_skills==MAX_SKILLS_PER_AGENT) {
+					LM_WARN("too many skills (%d) for the agent <%.*s>, "
+						"discarding <%.*s>\n",
+						agent->no_skills, agent->id.len, agent->id.s,
+						(int)(skills->s+skills->len-p), p);
+					break;
+				}
 				skill.s = p;
 				p = q_memchr(skill.s, ',', skills->s+skills->len-skill.s);
 				skill.len = p?(p-skill.s):(skills->s+skills->len-skill.s);
 				trim(&skill);
 				if (skill.len) {
 					skill_id = get_skill_id(data,&skill);
 					if (skill_id==0) {
-						LM_ERR("cannot get skill id\n");
-						goto error;
+						LM_WARN("unknown skill <%.*s>  for the agent <%.*s>,"
+							"discarding\n",
+							skill.len, skill.s, agent->id.len, agent->id.s);
+					} else {
+						n = agent->no_skills++;
+						agent->skills[n] = skill_id;
 					}
-					n = agent->no_skills++; 
-					agent->skills[n] = skill_id;
 				}
 				if(p)
 					p++;

modules/call_center/cc_data.h

@@ -82,7 +82,7 @@ struct cc_flow {
 };
 
 
-#define MAX_SKILLS_PER_AGENT 32
+#define MAX_SKILLS_PER_AGENT 64
 
 typedef enum {
 	CC_AGENT_FREE,