188 lines
3.5 KiB
C
188 lines
3.5 KiB
C
/* for complex link stuff */
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#ifdef __linux__
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <net/ethernet.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <net/if_arp.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <linux/types.h>
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#include <linux/if.h>
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#include <linux/wireless.h>
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#include <netinet/if_ether.h>
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/* the complex way - thanks to simple being broken on gta02 */
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static int
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link_ext_get(int fd, const char *name, int req, struct iwreq *rq)
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{
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strncpy(rq->ifr_name, name, sizeof(rq->ifr_name) - 1);
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rq->ifr_name[sizeof(rq->ifr_name) - 1] = 0;
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return (ioctl(fd, req, rq));
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}
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static int link_fd = -1;
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static char link_ifname[1024];
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static struct iw_range link_range;
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static int link_has_range;
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static int
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link_setup(const char *name)
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{
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struct iwreq rq;
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link_ifname[0] = 0;
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if (!name)
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{
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FILE *f;
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link_ifname[0] = 0;
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f = fopen("/proc/net/wireless", "r");
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if (f)
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{
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char buf[1024];
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while (fgets(buf, sizeof(buf), f))
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{
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if (strchr(buf, ':'))
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{
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char *p;
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sscanf(buf, "%s", link_ifname);
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p = strchr(link_ifname, ':');
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if (p) *p = 0;
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break;
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}
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}
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fclose(f);
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}
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}
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else
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strcpy(link_ifname, name);
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if (!link_ifname[0]) return -1;
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link_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (link_fd < 0) return -1;
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link_has_range = 0;
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rq.u.data.pointer = (caddr_t)(&link_range);
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rq.u.data.length = sizeof(link_range);
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rq.u.data.flags = 1;
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if (link_ext_get(link_fd, link_ifname, SIOCGIWRANGE, &rq) >= 0)
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{
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link_has_range = 1;
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return 0;
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}
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close(link_fd);
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link_fd = -1;
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return -1;
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}
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static double
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link_quality(void)
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{
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struct iwreq rq;
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struct iw_statistics stats;
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if (link_fd < 0) return -1;
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rq.u.data.pointer = (caddr_t)(&stats);
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rq.u.data.length = sizeof(stats);
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rq.u.data.flags = 1;
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if (link_ext_get(link_fd, link_ifname, SIOCGIWSTATS, &rq) >= 0)
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return (double)stats.qual.qual / (double)link_range.max_qual.qual;
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close(link_fd);
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link_fd = -1;
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return -1;
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}
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/*
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static void
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link_end(void)
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{
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if (link_fd < 0) return;
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close(link_fd);
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link_fd = -1;
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}
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static int
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_wifi_signal_get(void)
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{
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FILE *f;
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int strength = -1;
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char buf[4096];
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f = fopen("/proc/net/wireless", "r");
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if (!f) return -1;
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while (fgets(buf, 256, f))
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{
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int dummy;
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int count;
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int found_dev = 0;
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int wlan_status = 0;
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int wlan_link = 0;
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int wlan_level = 0;
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int wlan_noise = 0;
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char iface[64];
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count = sscanf(buf, "%s %i %i %i %i %i %i %i %i %i %i\n",
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iface, &wlan_status, &wlan_link, &wlan_level,
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&wlan_noise, &dummy, &dummy, &dummy, &dummy, &dummy,
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&dummy);
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if (count != 3) continue;
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fclose(f);
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return wlan_link;
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}
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fclose(f);
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return -1;
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}
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*/
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int
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main(int argc, char **argv)
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{
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int pstrength = -2;
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int strength = -1;
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int sleeptime = 8;
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const char *devname = NULL;
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if (argc > 1) sleeptime = atoi(argv[1]);
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if (argc > 2) devname = argv[2];
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for (;;)
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{
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pstrength = strength;
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if (link_fd < 0)
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{
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if (link_setup(devname) >= 0)
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strength = link_quality() * 100.0;
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}
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else
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strength = link_quality() * 100.0;
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if (pstrength != strength)
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{
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if (strength < 0) printf("ERROR\n");
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else printf("%i\n", strength);
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fflush(stdout);
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}
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sleep(sleeptime);
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}
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return 0;
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}
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#else
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int
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main(int argc, char **argv)
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{
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return 0;
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}
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#endif
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