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/*
* 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);
}
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