support displaying current nameservers

* gathers information from /etc/resolv.conf
* included (still commented) code to prevent reading too often,
  as I'm not sure whether reading from a real FS (not /proc or /sys)
  could generate higher load in some cases -> comments please!


git-svn-id: https://conky.svn.sourceforge.net/svnroot/conky/trunk/conky1@1035 7f574dfc-610e-0410-a909-a81674777703

doc/conky.1

@@ -1004,6 +1004,10 @@ Prints the file name of the current MPD song
 \fB\*(T<\fBmpd_smart\fR\*(T>\fR 
 Prints the song name in either the form "artist - title" or file name, depending on whats available
 
+.TP 
+\fB\*(T<\fBnameserver\fR\*(T>\fR \*(T<\fB(index)\fR\*(T> 
+Print a nameserver from /etc/resolv.conf. Index starts at and defaults to 0.
+
 .TP 
 \fB\*(T<\fBnew_mails\fR\*(T>\fR \*(T<\fB(mailbox)\fR\*(T> \*(T<\fB(interval)\fR\*(T> 
 Unread mail count in the specified mailbox or mail spool if

doc/variables.xml

@@ -1421,6 +1421,16 @@
 	<para></para></listitem>
 </varlistentry>
 
+<varlistentry>
+	<term>
+		<command><option>nameserver</option></command>
+	<option>(index)</option>
+	</term>
+	<listitem>
+		Print a nameserver from /etc/resolv.conf. Index starts at and defaults to 0.
+	<para></para></listitem>
+</varlistentry>
+
 <varlistentry>
 	<term>
 		<command><option>new_mails</option></command>

src/common.c

@@ -160,6 +160,50 @@ void clear_net_stats(void)
 	memset(netstats, 0, sizeof(netstats));
 }
 
+void free_dns_data(void)
+{
+	int i;
+	struct dns_data *data = &info.nameserver_info;
+	for (i = 0; i < data->nscount; i++)
+		free(data->ns_list[i]);
+	if (data->ns_list)
+		free(data->ns_list);
+	memset(data, 0, sizeof(struct dns_data));
+}
+
+//static double last_dns_update;
+
+void update_dns_data(void)
+{
+	FILE *fp;
+	char line[256];
+	struct dns_data *data = &info.nameserver_info;
+
+	/* maybe updating too often causes higher load because of /etc lying on a real FS
+	if (current_update_time - last_dns_update < 10.0)
+		return;
+	else
+		last_dns_update = current_update_time;
+	*/
+
+	free_dns_data();
+
+	if ((fp = fopen("/etc/resolv.conf", "r")) == NULL)
+		return;
+	while(!feof(fp)) {
+		if (fgets(line, 255, fp) == NULL)
+			goto OUT;
+		if (!strncmp(line, "nameserver ", 11)) {
+			line[strlen(line) - 1] = '\0';	// remove trailing newline
+			data->nscount++;
+			data->ns_list = realloc(data->ns_list, data->nscount * sizeof(char *));
+			data->ns_list[data->nscount - 1] = strdup(line + 11);
+		}
+	}
+OUT:
+	fclose(fp);
+}
+
 void format_seconds(char *buf, unsigned int n, long t)
 {
 	if (t >= 24 * 60 * 60) {	/* hours necessary when there are days? */
@@ -314,6 +358,9 @@ void update_stuff()
 	if (NEED(INFO_GW)) {
 		update_gateway_info();
 	}
+	if (NEED(INFO_DNS)) {
+		update_dns_data();
+	}
 }
 
 int round_to_int(float f)

src/conky.c

@@ -1185,6 +1185,7 @@ enum text_object_type {
 	OBJ_mixerbar,
 	OBJ_mixerlbar,
 	OBJ_mixerrbar,
+	OBJ_nameserver,
 	OBJ_new_mails,
 	OBJ_nodename,
 	OBJ_pre_exec,
@@ -2177,6 +2178,9 @@ static void free_text_objects(unsigned int count, struct text_object *objs)
 				free(objs[i].data.texeci.cmd);
 				free(objs[i].data.texeci.buffer);
 				break;
+			case OBJ_nameserver:
+				free_dns_data();
+				break;
 			case OBJ_top:
 			case OBJ_top_mem:
 				if (info.first_process) {
@@ -2850,6 +2854,8 @@ static struct text_object *construct_text_object(const char *s,
 		obj->data.fs = prepare_fs_stat(arg);
 	END OBJ(hr, 0)
 		obj->data.i = arg ? atoi(arg) : 1;
+	END OBJ(nameserver, INFO_DNS)
+		obj->data.i = arg ? atoi(arg) : 0;
 	END OBJ(offset, 0)
 		obj->data.i = arg ? atoi(arg) : 1;
 	END OBJ(voffset, 0)
@@ -5130,6 +5136,11 @@ static void generate_text_internal(char *p, int p_max_size,
 			OBJ(hr) {
 				new_hr(p, obj->data.i);
 			}
+			OBJ(nameserver) {
+				if (cur->nameserver_info.nscount > obj->data.i)
+					snprintf(p, p_max_size, "%s",
+							cur->nameserver_info.ns_list[obj->data.i]);
+			}
 #ifdef RSS
 			OBJ(rss) {
 				PRSS *data = get_rss_info(obj->data.rss.uri,

src/conky.h

@@ -135,6 +135,11 @@ struct net_stat {
 	char ap[18];
 };
 
+struct dns_data {
+	int nscount;
+	char **ns_list;
+};
+
 unsigned int diskio_value;
 unsigned int diskio_read_value;
 unsigned int diskio_write_value;
@@ -305,7 +310,8 @@ enum {
 	INFO_SMAPI = 25,
 #endif
 	INFO_USERS = 26,
-	INFO_GW = 27
+	INFO_GW = 27,
+	INFO_DNS = 28
 };
 
 /* get_battery_stuff() item selector */
@@ -369,6 +375,7 @@ struct information {
 #endif
 	struct usr_info users;
 	struct gateway_info gw_info;
+	struct dns_data nameserver_info;
 	struct process *cpu[10];
 	struct process *memu[10];
 	struct process *first_process;
@@ -515,6 +522,8 @@ void format_seconds(char *buf, unsigned int n, long t);
 void format_seconds_short(char *buf, unsigned int n, long t);
 struct net_stat *get_net_stat(const char *dev);
 void clear_net_stats(void);
+void free_dns_data(void);
+void update_dns_data(void);
 void update_users();
 
 void update_stuff();