Searching on IW_ESSID_MAX_SIZE across wlan drivers
shows many different ways to determine the length of the ESS-ID.
This could be simpler.
I'd suggest determine the length of the ESS string in a way that
works for both the old and the new version of wireless extensions,
by double checking if the last character is a \0 byte.
In the meantime, users should just enter a dummy character at
the end of the ESS in /etc/network/interfaces or the network config tool.
linux-source-2.6.20/ubuntu/wireless/acx/ioctl.c :
if (dwrq->length > IW_ESSID_MAX_SIZE+1) {
result = -E2BIG;
goto end_unlock;
}
if (len > sizeof(adev->essid))
len = sizeof(adev->essid);
memcpy(adev->essid, extra, len-1);
adev->essid[len-1] = '\0';
/* Paranoia: just in case there is a '\0'... */
adev->essid_len = strlen(adev->essid);
at76/at76c503.c :
memcpy(scan.essid, dev->essid, IW_ESSID_MAX_SIZE);
scan.essid_size = dev->essid_size;
ipw3945/ipw3945.c :
#if WIRELESS_EXT > 20
#define IW_ESSID_FIX 0
#else
#define IW_ESSID_FIX 1
...
#endif
length = wrqu->essid.length - IW_ESSID_FIX;
iwlwifi/base.c :
essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
while (essid_len--) {
if (*s == '\0') {
*d++ = '\\';
*d++ = '0';
s++;
} else {
*d++ = *s++;
}
}
*d = '\0';
...
priv->direct_ssid_len = (u8)
min((u8) len, (u8) IW_ESSID_MAX_SIZE);
memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
--
iwconfig lost the last letter of essid when using r818x driver
https://bugs.launchpad.net/bugs/98926
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