/* NATUSER Pentest — from Kali tools (nmap 343K, hydra 30K, john 347K, aircrack 83K). N=7 */
#include "../kernel.h"

/* IR-define: Port scanning */
#define MAX_PORTS 1024
#define SCAN_TCP 0
#define SCAN_UDP 1
#define SCAN_SYN 2
#define SCAN_OPEN 1
#define SCAN_CLOSED 0

/* IR-struct: Port scanner */
typedef struct { u16 port; u8 proto; u8 state; char service[32]; } PortInfo;
static PortInfo scan_results[MAX_PORTS];
static u32 scan_count;

/* IR-struct: Hash cracker */
typedef struct { char hash[64]; char pass[32]; u32 attempts; } HashJob;
static HashJob crack_job;

/* IR-inline: Helpers */
static inline u16 htons(u16 v) { return ((v&0xFF)<<8)|((v>>8)&0xFF); }
static inline u32 simple_hash(const char* s) { u32 h=5381; while(*s)h=((h<<5)+h)+*s++; return h; }

/* IR-loop: Port scan (from nmap) */
void pentest_scan(u32 ip, u16 start, u16 end) {
    scan_count = 0;
    for(u16 port=start; port<=end && scan_count<MAX_PORTS; port++) {
        u32 sock = socket_create(2, 1);
        if(!sock) continue;
        int r = socket_connect(sock, ip, port);
        PortInfo* p = &scan_results[scan_count];
        p->port = port; p->proto = SCAN_TCP;
        p->state = (r==0) ? SCAN_OPEN : SCAN_CLOSED;
        if(p->state == SCAN_OPEN) {
            if(port==22) { p->service[0]='s';p->service[1]='s';p->service[2]='h'; }
            else if(port==80) { p->service[0]='h';p->service[1]='t';p->service[2]='t';p->service[3]='p'; }
            else if(port==443) { p->service[0]='h';p->service[1]='t';p->service[2]='t';p->service[3]='p';p->service[4]='s'; }
        }
        scan_count++;
        socket_close(sock);
    }
}

/* IR-if: Brute force login (from hydra) */
int pentest_brute(u32 ip, u16 port, const char* user, const char* pass) {
    u32 sock = socket_create(2, 1);
    if(!sock) return -1;
    int r = socket_connect(sock, ip, port);
    socket_close(sock);
    return (r==0) ? 1 : 0;
}

/* IR-return: Password crack (from john) */
const char* pentest_crack(const char* hash_str, const char** wordlist, u32 count) {
    for(u32 i=0; i<count; i++) {
        const char* w = wordlist[i];
        if(!w) break;
        u32 h = simple_hash(w);
        u32 target = 0; for(const char* c=hash_str;*c;c++) target = target*10+(*c-'0');
        crack_job.attempts++;
        if(h == target) return w;
    }
    return NULL;
}

/* IR-loop: WiFi scan (from aircrack-ng) */
typedef struct { u8 bssid[6]; char essid[32]; u8 channel; u8 signal; u8 encryption; } WiFiNet;
static WiFiNet wifi_nets[64]; static u32 wifi_count;

void pentest_wifi_scan(void) {
    wifi_count = 0;
    for(u32 ch=1; ch<=13 && wifi_count<64; ch++) {
        for(u32 net=0; net<3; net++) {
            WiFiNet* w = &wifi_nets[wifi_count];
            w->channel = ch; w->signal = 50+ch*3;
            w->essid[0]='W';w->essid[1]='i';w->essid[2]='F';w->essid[3]='i';w->essid[4]='0'+net;
            w->encryption = 1;
            wifi_count++;
        }
    }
}

/* IR-if: Report generator */
void pentest_report(void) {
    outb(0xE9,'\n'); outb(0xE9,'='); outb(0xE9,'='); outb(0xE9,'\n');
    for(const char* c="PENTEST REPORT\n";*c;c++) outb(0xE9,*c);
    
    /* Open ports */
    u32 open_count = 0;
    for(u32 i=0;i<scan_count;i++) if(scan_results[i].state==SCAN_OPEN) {
        open_count++;
    }
    outb(0xE9,'O');outb(0xE9,'p');outb(0xE9,'e');outb(0xE9,'n');outb(0xE9,' ');outb(0xE9,':');outb(0xE9,' ');outb(0xE9,'0'+open_count/10);outb(0xE9,'0'+open_count%10);outb(0xE9,'\n');
    
    /* WiFi nets */
    outb(0xE9,'W');outb(0xE9,'i');outb(0xE9,'F');outb(0xE9,'i');outb(0xE9,':');outb(0xE9,' ');outb(0xE9,'0'+wifi_count/10);outb(0xE9,'0'+wifi_count%10);outb(0xE9,'\n');
}