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-rw-r--r--iw_if.c367
1 files changed, 19 insertions, 348 deletions
diff --git a/iw_if.c b/iw_if.c
index 97718c4..77fc5c2 100644
--- a/iw_if.c
+++ b/iw_if.c
@@ -40,9 +40,15 @@ static int if_get_flags(int skfd, const char *ifname)
}
/* Return true if @ifname is known to be up. */
-bool if_is_up(int skfd, const char *ifname)
+bool if_is_up(const char *ifname)
{
- return if_get_flags(skfd, ifname) & IFF_UP;
+ int ret, skfd = socket(AF_INET, SOCK_DGRAM, 0);
+
+ if (skfd < 0)
+ err_sys("%s: can not open socket", __func__);
+ ret = if_get_flags(skfd, ifname) & IFF_UP;
+ close(skfd);
+ return ret;
}
/** Bring @ifname up if not already up. Return 0 if ok, < 0 on error. */
@@ -101,14 +107,15 @@ void if_getinf(const char *ifname, struct if_info *info)
}
/**
- * iw_get_interface_list - Return NULL-terminated array of WiFi interfaces.
+ * iw_get_interface_list - fill if_list with NULL-terminated array of WiFi
+ * interfaces.
* Use the safe route of checking /proc/net/dev/ for wireless interfaces:
* - SIOCGIFCONF only returns running interfaces that have an IP address;
* - /proc/net/wireless may exist, but may not list all wireless interfaces.
*/
-char **iw_get_interface_list(void)
+void iw_get_interface_list(char** if_list, size_t max_entries)
{
- char **if_list = NULL, *p, tmp[BUFSIZ];
+ char *p, tmp[BUFSIZ];
int nifs = 1; /* if_list[nifs-1] = NULL */
struct iwreq wrq;
FILE *fp;
@@ -129,27 +136,24 @@ char **iw_get_interface_list(void)
* Use SIOCGIWNAME as indicator: if interface does not
* support this ioctl, it has no wireless extensions.
*/
- strncpy(wrq.ifr_name, p, IFNAMSIZ);
+ snprintf(wrq.ifr_name, IFNAMSIZ, "%s", p);
if (ioctl(skfd, SIOCGIWNAME, &wrq) < 0)
continue;
-
- if_list = realloc(if_list, sizeof(char *) * (nifs + 1));
- if (if_list == NULL)
- err_sys("can not reallocate interface list");
+ if(nifs >= max_entries) break;
if_list[nifs-1] = strdup(p);
if_list[nifs++] = NULL;
}
}
close(skfd);
fclose(fp);
- return if_list;
}
void if_getstat(const char *ifname, struct if_stat *stat)
{
char line[0x100];
- unsigned long d;
+ unsigned long long d;
char *lp;
+ size_t l = strlen(ifname);
const char path[] = "/proc/net/dev";
FILE *fp = fopen(path, "r");
@@ -161,11 +165,11 @@ void if_getstat(const char *ifname, struct if_stat *stat)
*/
while (fgets(line, sizeof(line), fp)) {
lp = line + strspn(line, " ");
- if (!strncmp(lp, ifname, strlen(ifname))) {
- lp += strlen(ifname) + 1;
+ if (!strncmp(lp, ifname, l) && lp[l] == ':') {
+ lp += l + 1;
lp += strspn(lp, " ");
- sscanf(lp, "%Lu %Lu %lu %lu %lu %lu %lu %lu %Lu %Lu",
+ sscanf(lp, "%llu %llu %llu %llu %llu %llu %llu %llu %llu %llu",
&stat->rx_bytes, &stat->rx_packets, &d, &d, &d, &d, &d, &d,
&stat->tx_bytes, &stat->tx_packets);
}
@@ -205,11 +209,6 @@ void dyn_info_get(struct iw_dyn_info *info,
info->essid[iwr.u.essid.length] = '\0';
}
- if (ioctl(skfd, SIOCGIWNWID, &iwr) >= 0) {
- info->cap_nwid = 1;
- memcpy(&info->nwid, &iwr.u.nwid, sizeof(info->nwid));
- }
-
iwr.u.essid.pointer = (caddr_t) info->nickname;
iwr.u.essid.length = sizeof(info->nickname);
iwr.u.essid.flags = 0;
@@ -334,331 +333,3 @@ void iw_getinf_range(const char *ifname, struct iw_range *range)
err_sys("can not get range information");
close(skfd);
}
-
-/*
- * Obtain periodic IW statistics
- */
-static int rand_wave(float *rlvl, float *step, float *rlvl_next, float range)
-{
- int i;
-
- for (i = 0; i < WAVE_RAND_SPREAD; i++)
- if (*rlvl < *rlvl_next) {
- if (*rlvl_next - *rlvl < *step)
- *step /= 2.0;
- *rlvl += *step;
- } else if (*rlvl > *rlvl_next) {
- if (*rlvl - *rlvl_next < *step)
- *step /= 2.0;
- *rlvl -= *step;
- }
- *step += (random() / (float)RAND_MAX) - 0.5;
- if (*rlvl == *rlvl_next || *step < 0.05) {
- *rlvl_next = (range * random()) / RAND_MAX;
- *step = random() / (float)RAND_MAX;
- }
- return *rlvl;
-}
-
-/* Random signal/noise/quality levels */
-static void iw_getstat_random(struct iw_stat *iw)
-{
- static float rnd_sig, snext, sstep = 1.0, rnd_noise, nnext, nstep = 1.0;
-
- rand_wave(&rnd_sig, &sstep, &snext, conf.sig_max - conf.sig_min);
- rand_wave(&rnd_noise, &nstep, &nnext, conf.noise_max - conf.noise_min);
-
- if (iw->range.max_qual.qual == 0)
- iw->range.max_qual.qual = WAVE_RAND_QUAL_MAX;
-
- iw->stat.qual.level = dbm_to_u8(conf.sig_min + rnd_sig);
- iw->stat.qual.noise = dbm_to_u8(conf.noise_min + rnd_noise);
- iw->stat.qual.updated = IW_QUAL_DBM;
- iw->stat.qual.qual = map_range(conf.sig_min + rnd_sig,
- conf.sig_min, conf.sig_max,
- 0, iw->range.max_qual.qual);
-}
-
-static void iw_getstat_real(struct iw_statistics *stat)
-{
- struct iwreq wrq;
- int skfd = socket(AF_INET, SOCK_DGRAM, 0);
-
- if (skfd < 0)
- err_sys("%s: can not open socket", __func__);
-
- wrq.u.data.pointer = (caddr_t) stat;
- wrq.u.data.length = sizeof(*stat);
- wrq.u.data.flags = 0;
- strncpy(wrq.ifr_name, conf_ifname(), IFNAMSIZ);
-
- if (ioctl(skfd, SIOCGIWSTATS, &wrq) < 0) {
- /*
- * iw_handler_get_iwstats() returns EOPNOTSUPP if
- * there are no statistics. Bail out in this case.
- */
- if (errno != EOPNOTSUPP)
- err_sys("can not obtain iw statistics");
- errno = 0;
- memset(&wrq, 0, sizeof(wrq));
- }
- close(skfd);
-}
-
-/*
- * Generate dBm values and perform sanity checks on values.
- * Code in part taken from wireless extensions #30
- * @range: range information, read-only
- * @qual: wireless statistics, read-write
- * @dbm: dBm level information, write-only
- */
-void iw_sanitize(struct iw_range *range, struct iw_quality *qual,
- struct iw_levelstat *dbm)
-{
- memset(dbm, 0, sizeof(*dbm));
-
- if (qual->level != 0 || (qual->updated & (IW_QUAL_DBM | IW_QUAL_RCPI))) {
- /*
- * RCPI (IEEE 802.11k) statistics:
- * RCPI = int{(Power in dBm +110)*2}
- * for 0 dBm > Power > -110 dBm
- */
- if (qual->updated & IW_QUAL_RCPI) {
- if (!(qual->updated & IW_QUAL_LEVEL_INVALID))
- dbm->signal = (double)(qual->level / 2.0) - 110.0;
- if (!(qual->updated & IW_QUAL_NOISE_INVALID))
- dbm->noise = (double)(qual->noise / 2.0) - 110.0;
-
- } else if ((qual->updated & IW_QUAL_DBM) ||
- qual->level > range->max_qual.level) {
- if (!(qual->updated & IW_QUAL_LEVEL_INVALID))
- dbm->signal = u8_to_dbm(qual->level);
- if (!(qual->updated & IW_QUAL_NOISE_INVALID))
- dbm->noise = u8_to_dbm(qual->noise);
- } else {
- /*
- * Relative values (0 -> max)
- */
- if (!(qual->updated & IW_QUAL_LEVEL_INVALID))
- dbm->signal = mw2dbm(qual->level);
- if (!(qual->updated & IW_QUAL_NOISE_INVALID))
- dbm->noise = mw2dbm(qual->noise);
- }
- } else {
- qual->updated |= IW_QUAL_ALL_INVALID;
- }
-
- /*
- * Value sanity checks
- *
- * These rules serve to avoid "insensible" level displays. Please do send
- * comments and/or bug reports if you encounter room for improvement.
- *
- * 1) if noise level is valid, but signal level is not, displaying just
- * the noise level does not reveal very much - can be omitted;
- * 2) if the noise level is below an "invalid" magic value (see iw_if.h),
- * declare the noise value to be invalid;
- * 3) SNR is only displayed if both signal and noise values are valid.
- */
- if (qual->updated & IW_QUAL_LEVEL_INVALID)
- qual->updated |= IW_QUAL_NOISE_INVALID;
- if (dbm->noise <= NOISE_DBM_SANE_MIN)
- qual->updated |= IW_QUAL_NOISE_INVALID;
-}
-
-void iw_getstat(struct iw_stat *iw)
-{
- memset(&iw->stat, 0, sizeof(iw->stat));
-
- if (conf.random)
- iw_getstat_random(iw);
- else
- iw_getstat_real(&iw->stat);
-
- iw_sanitize(&iw->range, &iw->stat.qual, &iw->dbm);
-}
-
-const char *we_version(void)
-{
- static char buf[BUFSIZ];
- struct iw_stat iw;
-
- iw_getinf_range(conf_ifname(), &iw.range);
- sprintf(buf, "wireless extensions v%d (source v%d)",
- iw.range.we_version_compiled, iw.range.we_version_source);
- return buf;
-}
-
-void dump_parameters(void)
-{
- struct iw_dyn_info info;
- struct iw_stat iw;
- struct if_stat nstat;
- int i;
-
- iw_getinf_range(conf_ifname(), &iw.range);
- dyn_info_get(&info, conf_ifname(), &iw.range);
- iw_getstat(&iw);
- if_getstat(conf_ifname(), &nstat);
-
- printf("\n");
- printf("Configured device: %s (%s)\n", conf_ifname(), info.name);
- printf(" Security: %s\n", iw.range.enc_capa ?
- format_enc_capab(iw.range.enc_capa, ", ") : "WEP");
- if (iw.range.num_encoding_sizes &&
- iw.range.num_encoding_sizes < IW_MAX_ENCODING_SIZES) {
-
- printf(" Key sizes: ");
- for (i = 0; i < iw.range.num_encoding_sizes; i++) {
- if (i)
- printf(", ");
- if (iw.range.encoding_size[i] == 5)
- printf("WEP-40");
- else if (iw.range.encoding_size[i] == 13)
- printf("WEP-104");
- else
- printf("%u bits",
- iw.range.encoding_size[i] * 8);
- }
- printf("\n");
- }
- printf("\n");
-
- if (info.cap_essid) {
- if (info.essid_ct > 1)
- printf(" essid: \"%s\" [%d]\n",
- info.essid, info.essid_ct);
- else if (info.essid_ct)
- printf(" essid: \"%s\"\n", info.essid);
- else
- printf(" essid: off/any\n");
- }
-
- if (info.cap_nickname)
- printf(" nick: \"%s\"\n", info.nickname);
-
- if (info.cap_nwid) {
- if (info.nwid.disabled)
- printf(" nwid: off/any\n");
- else
- printf(" nwid: %X\n", info.nwid.value);
- }
-
- /* Some drivers only return the channel (e.g. ipw2100) */
- if (info.cap_freq && info.freq < 256)
- info.freq = channel_to_freq(info.freq, &iw.range);
- if (info.cap_freq && info.freq > 1e3) {
- i = freq_to_channel(info.freq, &iw.range);
- if (i >= 0)
- printf(" channel: %d\n", i);
- printf(" frequency: %g GHz\n", info.freq / 1.0e9);
- } else
- printf(" frequency: n/a\n");
-
- if (info.cap_sens) {
- if (info.sens < 0)
- printf(" sensitivity: %d dBm\n", info.sens);
- else
- printf(" sensitivity: %d/%d\n", info.sens,
- iw.range.sensitivity);
- }
-
- if (info.cap_txpower && info.txpower.disabled)
- printf(" tx-power: off\n");
- else if (info.cap_txpower && info.txpower.fixed)
- printf(" tx-power: %s\n", format_txpower(&info.txpower));
- else if (info.cap_txpower)
- printf(" TX-power: %s\n", format_txpower(&info.txpower));
-
- printf(" mode: %s\n", iw_opmode(info.mode));
-
- if (info.mode != 1 && info.cap_ap)
- printf(" access point: %s\n", format_bssid(&info.ap_addr));
-
- if (info.bitrate)
- printf(" bitrate: %g Mbit/s\n", info.bitrate / 1.0e6);
- else
- printf(" bitrate: n/a\n");
-
- printf(" retry: ");
- if (info.cap_retry)
- printf("%s\n", format_retry(&info.retry, &iw.range));
- else
- printf("n/a\n");
-
- printf(" rts thr: ");
- if (info.cap_rts) {
- if (info.rts.disabled)
- printf("off\n");
- else
- printf("%d B %s\n", info.rts.value,
- info.rts.fixed ? "" : "(auto-select)");
- } else
- printf("n/a\n");
-
- printf(" frag thr: ");
- if (info.cap_frag) {
- if (info.frag.disabled)
- printf("off\n");
- else
- printf("%d B %s\n", info.frag.value,
- info.frag.fixed ? "" : "(auto-select)");
- } else {
- printf("n/a\n");
- }
-
- printf(" encryption: ");
- if (!info.nkeys && has_net_admin_capability())
- printf("no information available\n");
- else if (!info.nkeys)
- printf("n/a (requires CAP_NET_ADMIN permissions)\n");
- for (i = 0; i < info.nkeys; i++) {
- if (i)
- printf(" ");
- /* Current key is marked by `=' sign */
- printf("[%u]%s ", i + 1, i + 1 == info.active_key ? "=" : ":");
-
- if (info.keys[i].flags & IW_ENCODE_DISABLED || !info.keys[i].size) {
- printf("off\n");
- } else {
- printf("%s", format_key(info.keys + i));
- if (info.keys[i].flags & IW_ENCODE_RESTRICTED)
- printf(", restricted");
- if (info.keys[i].flags & IW_ENCODE_OPEN)
- printf(", open");
- printf("\n");
- }
- }
-
- printf(" power management: ");
- if (info.cap_power)
- printf("%s\n", format_power(&info.power, &iw.range));
- else
- printf("n/a\n");
-
- printf("\n");
- printf(" link quality: %d/%d\n", iw.stat.qual.qual,
- iw.range.max_qual.qual);
- printf(" signal level: %.0f dBm (%s)\n", iw.dbm.signal,
- dbm2units(iw.dbm.signal));
- printf(" noise level: %.0f dBm (%s)\n", iw.dbm.noise,
- dbm2units(iw.dbm.noise));
- printf(" SNR: %.0f dB\n", iw.dbm.signal - iw.dbm.noise);
-
- /* RX stats */
- printf(" RX total: %'llu packets (%s)\n", nstat.rx_packets,
- byte_units(nstat.rx_bytes));
- printf(" invalid nwid: %'u\n", iw.stat.discard.nwid);
- printf(" invalid key: %'u\n", iw.stat.discard.code);
- printf(" invalid fragm.: %'u\n", iw.stat.discard.fragment);
- printf(" missed beacons: %'u\n", iw.stat.miss.beacon);
- printf(" misc errors: %'u\n", iw.stat.discard.misc);
-
- /* TX stats */
- printf(" TX total: %'llu packets (%s)\n", nstat.tx_packets,
- byte_units(nstat.tx_bytes));
- printf(" exc. MAC retries: %'u\n", iw.stat.discard.retries);
-
- printf("\n");
- dyn_info_cleanup(&info);
-}