1 files changed, 203 insertions, 0 deletions
diff --git a/scan_scr.c b/scan_scr.c
new file mode 100644
index 0000000..ab6b433
--- /dev/null
+++ b/scan_scr.c
@@ -0,0 +1,203 @@
+/*
+ * wavemon - a wireless network monitoring aplication
+ *
+ * Copyright (c) 2001-2002 Jan Morgenstern <jan@jm-music.de>
+ *
+ * wavemon is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2, or (at your option) any later
+ * version.
+ *
+ * wavemon is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with wavemon; see the file COPYING.  If not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#include "iw_if.h"
+
+#define START_LINE	2	/* where to begin the screen */
+
+/* GLOBALS */
+static WINDOW *w_aplst;
+static pid_t pid;
+static void (*sig_tstp)(int);
+
+static char *fmt_scan_result(struct scan_result *cur, struct iw_range *iw_range,
+			     char buf[], size_t buflen)
+{
+	struct iw_levelstat dbm;
+	size_t len = 0;
+	int channel = freq_to_channel(cur->freq, iw_range);
+
+	iw_sanitize(iw_range, &cur->qual, &dbm);
+
+	if (!(cur->qual.updated & (IW_QUAL_QUAL_INVALID|IW_QUAL_LEVEL_INVALID)))
+		len += snprintf(buf + len, buflen - len, "%3.0f%%, %.0f dBm",
+				1E2 * cur->qual.qual / iw_range->max_qual.qual,
+				dbm.signal);
+	else if (!(cur->qual.updated & IW_QUAL_QUAL_INVALID))
+		len += snprintf(buf + len, buflen - len, "%2d/%d",
+				cur->qual.qual, iw_range->max_qual.qual);
+	else if (!(cur->qual.updated & IW_QUAL_LEVEL_INVALID))
+		len += snprintf(buf + len, buflen - len, "%.0f dBm",
+				dbm.signal);
+	else
+		len += snprintf(buf + len, buflen - len, "? dBm");
+
+
+	if (cur->freq < 1e3)
+		len += snprintf(buf + len, buflen - len, ", Chan %2.0f",
+				cur->freq);
+	else if (channel >= 0)
+		len += snprintf(buf + len, buflen - len, ", Ch %2d, %g MHz",
+				channel, cur->freq / 1e6);
+	else
+		len += snprintf(buf + len, buflen - len, ", %g GHz",
+				cur->freq / 1e9);
+
+	/* Access Points are marked by CP_SCAN_CRYPT/CP_SCAN_UNENC already */
+	if (cur->mode != IW_MODE_MASTER)
+		len += snprintf(buf + len, buflen - len, " %s",
+				iw_opmode(cur->mode));
+	if (cur->flags)
+		len += snprintf(buf + len, buflen - len, ", %s",
+				 format_enc_capab(cur->flags, "/"));
+	return buf;
+}
+
+static void display_aplist(WINDOW *w_aplst)
+{
+	char s[IW_ESSID_MAX_SIZE << 3];
+	int max_essid_len = 0;
+	int i, line = START_LINE;
+	struct iw_range range;
+	struct scan_result *head, *cur;
+	int skfd = socket(AF_INET, SOCK_DGRAM, 0);
+
+	if (skfd < 0)
+		err_sys("%s: can not open socket", __func__);
+
+	iw_getinf_range(conf_ifname(), &range);
+
+	head = get_scan_list(skfd, conf_ifname(),
+			     range.we_version_compiled, cmp_freq_sig);
+	if (head) {
+		;
+	} else if (errno == EPERM || !has_net_admin_capability()) {
+		/*
+		 * Don't try to read leftover results, it does not work reliably
+		 */
+		sprintf(s, "This screen requires CAP_NET_ADMIN permissions");
+	} else if (errno == EINTR || errno == EAGAIN || errno == EBUSY) {
+		/* Ignore temporary errors */
+		goto done;
+	} else if (!if_is_up(skfd, conf_ifname())) {
+		sprintf(s, "Interface '%s' is down ", conf_ifname());
+		if (!has_net_admin_capability())
+			strcat(s, "- can not scan");
+		else if (if_set_up(skfd, conf_ifname()) < 0)
+			sprintf(s, "Can not bring up '%s' for scanning: %s",
+				conf_ifname(), strerror(errno));
+		else
+			strcat(s, "- setting it up ...");
+	} else if (errno == EFAULT) {
+		/*
+		 * EFAULT can occur after a window resizing event and is temporary.
+		 * It may also occur when the interface is down, hence we need to
+		 * test the interface status first.
+		 */
+		goto done;
+	} else if (errno) {
+		sprintf(s, "No scan on %s: %s", conf_ifname(), strerror(errno));
+	} else {
+		sprintf(s, "No scan results on %s", conf_ifname());
+	}
+
+	for (i = 1; i <= MAXYLEN; i++)
+		mvwclrtoborder(w_aplst, i, 1);
+
+	if (!head)
+		waddstr_center(w_aplst, WAV_HEIGHT/2 - 1, s);
+
+	for (cur = head; cur; cur = cur->next) {
+		if (str_is_ascii(cur->essid))
+			max_essid_len = clamp(strlen(cur->essid),
+					      max_essid_len, IW_ESSID_MAX_SIZE);
+	}
+
+	/* Truncate overly long access point lists to match screen height */
+	for (cur = head; cur && line < MAXYLEN; line++, cur = cur->next) {
+		int col = CP_SCAN_NON_AP;
+
+		if (cur->mode == IW_MODE_MASTER)
+			col = cur->has_key ? CP_SCAN_CRYPT : CP_SCAN_UNENC;
+
+		wmove(w_aplst, line, 1);
+		if (!*cur->essid) {
+			sprintf(s, "%-*s ", max_essid_len, "<hidden ESSID>");
+			wattron(w_aplst, COLOR_PAIR(col));
+			waddstr(w_aplst, s);
+		} else if (str_is_ascii(cur->essid)) {
+			sprintf(s, "%-*s ", max_essid_len, cur->essid);
+			waddstr_b(w_aplst, s);
+			wattron(w_aplst, COLOR_PAIR(col));
+		} else {
+			sprintf(s, "%-*s ", max_essid_len, "<cryptic ESSID>");
+			wattron(w_aplst, COLOR_PAIR(col));
+			waddstr(w_aplst, s);
+		}
+		waddstr(w_aplst, ether_addr(&cur->ap_addr));
+
+		wattroff(w_aplst, COLOR_PAIR(col));
+
+		fmt_scan_result(cur, &range, s, sizeof(s));
+		waddstr(w_aplst, " ");
+		waddstr(w_aplst, s);
+	}
+	free_scan_result(head);
+done:
+	close(skfd);
+	wrefresh(w_aplst);
+}
+
+void scr_aplst_init(void)
+{
+	w_aplst = newwin_title(0, WAV_HEIGHT, "Scan window", false);
+	/*
+	 * Both parent and child process write to the terminal, updating 
+	 * different areas of the screen. Suspending wavemon brings the 
+	 * terminal state out of order, messing up the screen. The choice
+	 * is between a more  complicated (sophisticated) handling of
+	 * signals, and to keep it simple by not allowing to suspend.
+	 */
+	sig_tstp = xsignal(SIGTSTP, SIG_IGN);
+
+	/* Gathering scan data can take seconds. Inform user. */
+	mvwaddstr(w_aplst, START_LINE, 1, "Waiting for scan data ...");
+	wrefresh(w_aplst);
+
+	pid = fork();
+	if (pid < 0) {
+		err_sys("could not fork scan process");
+	} else if (pid == 0) {
+		do display_aplist(w_aplst);
+		while (usleep(conf.stat_iv * 1000) == 0);
+		exit(EXIT_SUCCESS);
+	}
+}
+
+int scr_aplst_loop(WINDOW *w_menu)
+{
+	return wgetch(w_menu);
+}
+
+void scr_aplst_fini(void)
+{
+	kill(pid, SIGTERM);
+	delwin(w_aplst);
+	xsignal(SIGTSTP, sig_tstp);
+}