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authorJonathan McCrohan <jmccrohan@gmail.com>2016-01-30 17:08:40 +0000
committerJonathan McCrohan <jmccrohan@gmail.com>2016-01-30 17:08:40 +0000
commit0b0aac6ce21bcb38d7e03dc2b3ff419861476a24 (patch)
treecaa65d08ef64dfd060a749ccc690efd7bcc2a7b3 /utils.c
parentd7ca0c3e555ef0b5250873ddce48ccf2326b017a (diff)
downloadwavemon-0b0aac6ce21bcb38d7e03dc2b3ff419861476a24.tar.gz
Imported Upstream version 0.8.0upstream/0.8.0
Diffstat (limited to '')
-rw-r--r--utils.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..10818ba
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,261 @@
+/*
+ * General-purpose utilities used by multiple files.
+ */
+#include "wavemon.h"
+#include "nl80211.h"
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netinet/ether.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <sys/socket.h>
+#include <linux/if.h>
+
+/* Maximum length of a MAC address: 2 * 6 hex digits, 6 - 1 colons, plus '\0' */
+#define MAC_ADDR_MAX 18
+
+/* Return true if all ethernet octets are zero. */
+bool ether_addr_is_zero(const struct ether_addr *ea)
+{
+ static const struct ether_addr zero = {{0}};
+
+ return memcmp(ea, &zero, sizeof(zero)) == 0;
+}
+
+/* Print a mac-address, include leading zeroes (unlike ether_ntoa(3)) */
+char *ether_addr(const struct ether_addr *ea)
+{
+ static char mac[MAC_ADDR_MAX];
+ char *d = mac, *a = ether_ntoa(ea);
+next_chunk:
+ if (a[0] == '\0' || a[1] == '\0' || a[1] == ':')
+ *d++ = '0';
+ while ((*d++ = conf.cisco_mac ? (*a == ':' ? '.' : *a) : toupper(*a)))
+ if (*a++ == ':')
+ goto next_chunk;
+ return mac;
+}
+
+/* Print mac-address translation from /etc/ethers if available */
+char *ether_lookup(const struct ether_addr *ea)
+{
+ static char hostname[BUFSIZ];
+
+ if (ether_ntohost(hostname, ea) == 0)
+ return hostname;
+ return ether_addr(ea);
+}
+
+/* Format an Ethernet mac address */
+char *mac_addr(const struct sockaddr *sa)
+{
+ if (sa->sa_family != ARPHRD_ETHER)
+ return "00:00:00:00:00:00";
+ return ether_lookup((const struct ether_addr *)sa->sa_data);
+}
+
+/* Format a (I)BSSID */
+char *format_bssid(const struct sockaddr *ap)
+{
+ uint8_t bcast_addr[ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+ uint8_t zero_addr[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+ if (memcmp(ap->sa_data, zero_addr, ETH_ALEN) == 0)
+ return "Not-Associated";
+ if (memcmp(ap->sa_data, bcast_addr, ETH_ALEN) == 0)
+ return "Invalid";
+ return mac_addr(ap);
+}
+
+/* count bits set in @mask the Brian Kernighan way */
+uint8_t bit_count(uint32_t mask)
+{
+ uint8_t bits_set;
+
+ for (bits_set = 0; mask; bits_set++)
+ mask &= mask - 1;
+
+ return bits_set;
+}
+
+/* netmask = contiguous 1's followed by contiguous 0's */
+uint8_t prefix_len(const struct in_addr *netmask)
+{
+ return bit_count(netmask->s_addr);
+}
+
+/* Pretty-print @sec into a string of up to 6 characters. */
+const char *pretty_time(const unsigned sec)
+{
+ static char buf[12];
+ unsigned d = sec / 86400,
+ h = sec % 86400 / 3600,
+ m = sec % 3600 / 60;
+
+ if (d > 9) {
+ sprintf(buf, "%u days", d);
+ } else if (d) {
+ if (h) {
+ sprintf(buf, "%ud %uh", d, h);
+ } else if (m) {
+ sprintf(buf, "%ud %dm", d, m);
+ } else {
+ sprintf(buf, "%u day%s", d, d == 1 ? "" : "s");
+ }
+ } else if (h) {
+ sprintf(buf, "%u:%02uh", h, m);
+ } else if (m) {
+ sprintf(buf, "%u:%02um", m, sec % 60);
+ } else {
+ sprintf(buf, "%u sec", sec);
+ }
+ return buf;
+}
+
+/* Like pretty_time, but allow milliseconds */
+const char *pretty_time_ms(const unsigned msec)
+{
+ static char buf[12];
+
+ if (msec < 1000) {
+ sprintf(buf, "%u ms", msec);
+ return buf;
+ }
+ return pretty_time(msec/1000);
+}
+
+/* Absolute power measurement in dBm (IW_QUAL_DBM): map into -192 .. 63 range */
+int u8_to_dbm(const int power)
+{
+ return power > 63 ? power - 0x100 : power;
+}
+uint8_t dbm_to_u8(const int dbm)
+{
+ return dbm < 0 ? dbm + 0x100 : dbm;
+}
+
+/* Convert log dBm values to linear mW */
+double dbm2mw(const double in)
+{
+ return pow(10.0, in / 10.0);
+}
+
+char *dbm2units(const double in)
+{
+ static char with_units[0x100];
+ double val = dbm2mw(in);
+
+ if (val < 0.00000001) {
+ sprintf(with_units, "%.2f pW", val * 1e9);
+ } else if (val < 0.00001) {
+ sprintf(with_units, "%.2f nW", val * 1e6);
+ } else if (val < 0.01) {
+ sprintf(with_units, "%.2f uW", val * 1e3);
+ } else {
+ sprintf(with_units, "%.2f mW", val);
+ }
+ return with_units;
+}
+
+/* Convert linear mW values to log dBm */
+double mw2dbm(const double in)
+{
+ return 10.0 * log10(in);
+}
+
+/* Stolen from iw:util.c */
+int ieee80211_frequency_to_channel(int freq)
+{
+ /* see 802.11-2007 17.3.8.3.2 and Annex J */
+ if (freq == 2484)
+ return 14;
+ else if (freq < 2484)
+ return (freq - 2407) / 5;
+ else if (freq >= 4910 && freq <= 4980)
+ return (freq - 4000) / 5;
+ else if (freq <= 45000) /* DMG band lower limit */
+ return (freq - 5000) / 5;
+ else if (freq >= 58320 && freq <= 64800)
+ return (freq - 56160) / 2160;
+ else
+ return 0;
+}
+
+const char *channel_width_name(enum nl80211_chan_width width)
+{
+ switch (width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ return "20 MHz (no HT)";
+ case NL80211_CHAN_WIDTH_20:
+ return "20 MHz";
+ case NL80211_CHAN_WIDTH_40:
+ return "40 MHz";
+ case NL80211_CHAN_WIDTH_80:
+ return "80 MHz";
+ case NL80211_CHAN_WIDTH_80P80:
+ return "80+80 MHz";
+ case NL80211_CHAN_WIDTH_160:
+ return "160 MHz";
+ default:
+ return "unknown";
+ }
+}
+
+/* stolen from iw:interface.c */
+const char *channel_type_name(enum nl80211_channel_type channel_type)
+{
+ switch (channel_type) {
+ case NL80211_CHAN_NO_HT:
+ return "NO HT";
+ case NL80211_CHAN_HT20:
+ return "HT20";
+ case NL80211_CHAN_HT40MINUS:
+ return "HT40-";
+ case NL80211_CHAN_HT40PLUS:
+ return "HT40+";
+ default:
+ return "unknown";
+ }
+}
+
+/* stolen from iw:util.c */
+const char *iftype_name(enum nl80211_iftype iftype)
+{
+ static char modebuf[100];
+ static const char *ifmodes[NL80211_IFTYPE_MAX + 1] = {
+ "Unspecified",
+ "IBSS",
+ "Managed",
+ "AP",
+ "AP/VLAN",
+ "WDS",
+ "Monitor",
+ "Mesh Point",
+ "P2P-Client",
+ "P2P-GO",
+ "P2P-Device",
+ "Outside of a BSS",
+ };
+
+ if (iftype <= NL80211_IFTYPE_MAX && ifmodes[iftype])
+ return ifmodes[iftype];
+ sprintf(modebuf, "Unknown mode (%d)", iftype);
+ return modebuf;
+}
+
+/* stolen from iw:reg.c */
+const char *dfs_domain_name(enum nl80211_dfs_regions region)
+{
+ switch (region) {
+ case NL80211_DFS_UNSET:
+ return "DFS-UNSET";
+ case NL80211_DFS_FCC:
+ return "DFS-FCC";
+ case NL80211_DFS_ETSI:
+ return "DFS-ETSI";
+ case NL80211_DFS_JP:
+ return "DFS-JP";
+ default:
+ return "DFS-invalid";
+ }
+}