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kitty_ssh.c
103 lines (88 loc) · 3.24 KB
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kitty_ssh.c
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#include "kitty_ssh.h"
#include "kitty_tools.h"
#ifdef MOD_PORTKNOCKING
void vprint(char *fmt, ...)
{ char buf[1024];
va_list args;
va_start(args, fmt);
vsprintf(buf,fmt, args);
if( buf[strlen(buf)-1]=='\n' ) buf[strlen(buf)-1]='\0';
printf(buf) ;
va_end(args);
}
int knock( char *hostname, unsigned short port, unsigned short proto) {
SOCKET sd;
struct hostent* host;
struct sockaddr_in addr;
host = gethostbyname(hostname);
if(host == NULL) { fprintf(stderr, "Cannot resolve hostname\n") ; return 1 ; }
if(proto == PROTO_UDP) {
sd = socket(PF_INET, SOCK_DGRAM, 0);
if(sd == -1) { fprintf(stderr, "Cannot open socket\n") ; return 2 ; }
} else {
unsigned long arg = !0;
sd = socket(PF_INET, SOCK_STREAM, 0);
if(sd == -1) { fprintf(stderr, "Cannot open socket\n") ; return 3 ; }
ioctlsocket(sd, FIONBIO, &arg);
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = *((long*)host->h_addr_list[0]);
addr.sin_port = htons(port);
if( proto == PROTO_UDP) {
vprint("Hitting udp %s:%u\n\n", inet_ntoa(addr.sin_addr), port);
connect(sd, (struct sockaddr*)&addr, sizeof(struct sockaddr));
send(sd, NULL, 0, 0);
} else {
vprint("Hitting tcp %s:%u\n\n", inet_ntoa(addr.sin_addr), port);
connect(sd, (struct sockaddr*)&addr, sizeof(struct sockaddr));
}
shutdown(sd, 2);
closesocket(sd);
return 0;
}
int ManagePortKnocking( char* host, char *portknockseqorig ) {
char portstr[256], protostr[256];
short port, proto ;
int i,j;
char * portknockseq = NULL ;
if( (host==NULL) || (portknockseqorig==NULL) ) return 0 ;
if( (strlen(host)==0) || (strlen(portknockseqorig)==0) ) return 0 ;
portknockseq = (char*)malloc( strlen(portknockseqorig)+1 ) ;
strcpy(portknockseq,portknockseqorig);
for(i=0;i<strlen(portknockseq);i++)
{ if( (portknockseq[i]==' ')||(portknockseq[i]==' ')||(portknockseq[i]==';')||(portknockseq[i]=='-') ) portknockseq[i]=','; }
while( portknockseq[0]==',' ) del(portknockseq,1,1);
while( portknockseq[strlen(portknockseq)-1]==',' ) portknockseq[strlen(portknockseq)-1]='\0';
while( (i=poss(",:",portknockseq)) ) { del(portknockseq,i,1); }
while( (i=poss(":,",portknockseq)) ) { del(portknockseq,i+1,1); }
while( (i=poss(",,",portknockseq)) ) { del(portknockseq,i,1); }
while( strlen(portknockseq)>0 ) {
while( (portknockseq[0]==' ')||(portknockseq[0]==' ')||(portknockseq[0]==',')||(portknockseq[0]==';') ) del(portknockseq,1,1);
if( strlen(portknockseq)>0 ) {
i=poss(":",portknockseq) ; if(i==0) i=strlen(portknockseq)+1;
j=poss(",",portknockseq) ; if(j==0) j=strlen(portknockseq)+1; if(j<i) i=j;
strcpy(portstr,portknockseq);
if( portstr[i-1]!=':' ) {
portstr[i-1]='\0'; del(portknockseq,1,i);
strcpy(protostr,"tcp");
}
else {
portstr[i-1]='\0'; del(portknockseq,1,i);
i=poss(",",portknockseq) ; if(i==0) i=strlen(portknockseq)+1;
strcpy(protostr,portknockseq); protostr[i-1]='\0'; del(portknockseq,1,i);
}
port=atoi(portstr);
if( !stricmp(protostr,"udp") ) proto=PROTO_UDP ; else proto=PROTO_TCP ;
if( !stricmp(protostr,"s") ) {
Sleep( atof(portstr)*1000 ) ;
} else {
if( knock(host,port,proto) ) fprintf(stderr, "Unable to knock port" ) ;
Sleep( 40 ) ;
}
}
}
free(portknockseq);
return 1;
}
#endif