From ea2432988cde62b4520e547d8b5d95be489a459a Mon Sep 17 00:00:00 2001
From: Christian Hesse <mail@eworm.de>
Date: Tue, 6 Mar 2018 16:31:09 +0100
Subject: show the SSID for wireless interfaces

---
 config.def.h     |  1 +
 netlink-notify.c | 30 ++++++++++++++++++++++++++++--
 netlink-notify.h |  5 +++++
 3 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/config.def.h b/config.def.h
index 34a496e..937bd9f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -20,6 +20,7 @@
 /* define notification text messages */
 #define TEXT_TOPIC	"Netlink Notification"
 #define TEXT_NEWLINK	"Interface <b>%s</b> is <b>%s</b>."
+#define TEXT_WIRELESS	"Interface <b>%s</b> is <b>%s</b> on <b>%s</b>."
 #define TEXT_NEWADDR	"Interface <b>%s</b> has new %s address\n<b>%s</b>/%d."
 #define TEXT_DELLINK	"Interface <b>%s</b> has gone away."
 
diff --git a/netlink-notify.c b/netlink-notify.c
index d197dd2..bc41954 100644
--- a/netlink-notify.c
+++ b/netlink-notify.c
@@ -111,12 +111,38 @@ void list_addresses(struct addresses_seen *addresses_seen, char *interface) {
 	putchar('\n');
 }
 
+/*** get_ssid ***/
+void get_ssid(const char *interface, char *essid) {
+	int sockfd;
+	struct iwreq wreq;
+
+	memset(&wreq, 0, sizeof(struct iwreq));
+	snprintf(wreq.ifr_name, IFNAMSIZ, interface);
+	wreq.u.essid.pointer = essid;
+	wreq.u.essid.length = IW_ESSID_MAX_SIZE + 1;
+
+	if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
+		return;
+
+	if (ioctl(sockfd, SIOCGIWESSID, &wreq) == -1)
+		return;
+}
+
 /*** newstr_link ***/
 char * newstr_link(char *interface, unsigned int flags) {
 	char *notifystr;
+	char essid[IW_ESSID_MAX_SIZE + 1];
+
+	memset(&essid, 0, IW_ESSID_MAX_SIZE + 1);
+	get_ssid(interface, essid);
 
-	notifystr = malloc(sizeof(TEXT_NEWLINK) + strlen(interface) + 4);
-	sprintf(notifystr, TEXT_NEWLINK, interface, (flags & CHECK_CONNECTED) ? "up" : "down");
+	if (strlen(essid) == 0) {
+		notifystr = malloc(sizeof(TEXT_NEWLINK) + strlen(interface) + 4);
+		sprintf(notifystr, TEXT_NEWLINK, interface, (flags & CHECK_CONNECTED) ? "up" : "down");
+	} else {
+		notifystr = malloc(sizeof(TEXT_WIRELESS) + strlen(interface) + 4 + strlen(essid));
+		sprintf(notifystr, TEXT_WIRELESS, interface, (flags & CHECK_CONNECTED) ? "up" : "down", essid);
+	}
 
 	return notifystr;
 }
diff --git a/netlink-notify.h b/netlink-notify.h
index fec85ae..ee61335 100644
--- a/netlink-notify.h
+++ b/netlink-notify.h
@@ -23,11 +23,13 @@
 #include <linux/if.h>
 #include <linux/netlink.h>
 #include <linux/rtnetlink.h>
+#include <linux/wireless.h>
 /* we have to undefine this before including net/if.h to
  * notget redefined structs, etc. */
 #undef __USE_MISC
 #include <net/if.h>
 #include <netinet/in.h>
+#include <sys/ioctl.h>
 #include <sys/socket.h>
 
 /* systemd headers */
@@ -73,6 +75,9 @@ int match_address(struct addresses_seen *addresses_seen, const char *address, un
 /*** list_addresses ***/
 void list_addresses(struct addresses_seen *addresses_seen, char *interface);
 
+/*** get_ssid ***/
+void get_ssid(const char *interface, char *essid);
+
 /*** newstr_link ***/
 char * newstr_link(char *interface, unsigned int flags);
 
-- 
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