89 lines
2.2 KiB
C
Executable File
89 lines
2.2 KiB
C
Executable File
#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <json-c/json.h>
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#include <iwinfo.h>
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#include <net/if.h>
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#define STR(x) #x
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#define XSTR(x) STR(x)
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#define BATIF_PREFIX "/sys/class/net/bat0/lower_"
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static struct json_object *get_stations(const struct iwinfo_ops *iw, const char *ifname) {
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int len;
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char buf[IWINFO_BUFSIZE];
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struct json_object *stations = json_object_new_object();
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if (iw->assoclist(ifname, buf, &len) == -1)
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return stations;
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// This is just: for entry in assoclist(ifname)
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for (struct iwinfo_assoclist_entry *entry = (struct iwinfo_assoclist_entry *)buf;
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(char*)(entry+1) <= buf + len; entry++) {
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struct json_object *station = json_object_new_object();
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json_object_object_add(station, "signal", json_object_new_int(entry->signal));
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json_object_object_add(station, "noise", json_object_new_int(entry->noise));
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json_object_object_add(station, "inactive", json_object_new_int(entry->inactive));
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char macstr[18];
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snprintf(macstr, sizeof(macstr), "%02x:%02x:%02x:%02x:%02x:%02x",
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entry->mac[0], entry->mac[1], entry->mac[2],
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entry->mac[3], entry->mac[4], entry->mac[5]);
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json_object_object_add(stations, macstr, station);
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}
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return stations;
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}
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static void badrequest() {
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printf("Status: 400 Bad Request\n\n");
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exit(1);
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}
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bool interface_is_valid(const char *ifname) {
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if (strlen(ifname) > IF_NAMESIZE)
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return false;
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if (strchr(ifname, '/') != NULL)
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return false;
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char *path = alloca(1 + strlen(BATIF_PREFIX) + strlen(ifname));
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sprintf(path, "%s%s", BATIF_PREFIX, ifname);
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return access(path, F_OK) == 0;
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}
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int main(void) {
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char *ifname = getenv("QUERY_STRING");
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if (ifname == NULL)
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badrequest();
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if (!interface_is_valid(ifname))
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badrequest();
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const struct iwinfo_ops *iw = iwinfo_backend(ifname);
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if (iw == NULL)
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badrequest();
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printf("Access-Control-Allow-Origin: *\n");
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printf("Content-type: text/event-stream\n\n");
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while (true) {
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struct json_object *obj;
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obj = get_stations(iw, ifname);
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printf("data: %s\n\n", json_object_to_json_string_ext(obj, JSON_C_TO_STRING_PLAIN));
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fflush(stdout);
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json_object_put(obj);
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usleep(150000);
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}
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return 0;
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}
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