Created
March 20, 2015 12:58
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Program for testing shellcode
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#include <fcntl.h> | |
#include <netinet/in.h> | |
#include <signal.h> | |
#include <stdio.h> | |
#include <sys/mman.h> | |
#include <sys/socket.h> | |
#include <sys/stat.h> | |
#include <sys/types.h> | |
#include <unistd.h> | |
static int create_server(unsigned short port) { | |
int server; | |
int flags; | |
#if defined(IPV6) | |
struct sockaddr_in6 addr; | |
server = socket(AF_INET6, SOCK_STREAM, 0); | |
if (server < 0) { | |
return -1; | |
} | |
flags = 1; | |
if (setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0) { | |
close(server); | |
return -1; | |
} | |
addr.sin6_family = AF_INET6; | |
addr.sin6_port = htons(port); | |
addr.sin6_addr = in6addr_any; | |
#else | |
struct sockaddr_in addr; | |
server = socket(AF_INET, SOCK_STREAM, 0); | |
if (server < 0) { | |
return -1; | |
} | |
flags = 1; | |
if (setsockopt(server, SOL_SOCKET, SO_REUSEADDR, &flags, sizeof(flags)) < 0) { | |
close(server); | |
return -1; | |
} | |
addr.sin_family = AF_INET; | |
addr.sin_port = htons(port); | |
addr.sin_addr.s_addr = htonl(INADDR_ANY); | |
#endif | |
if (bind(server, (struct sockaddr*)&addr, sizeof(addr)) < 0) { | |
close(server); | |
return -1; | |
} | |
if (listen(server, 10) < 0) { | |
close(server); | |
return -1; | |
} | |
return server; | |
} | |
void child_died(int sig) { | |
wait(&sig); | |
} | |
int main(int argc, char ** argv) { | |
pid_t pid; | |
size_t len; | |
struct stat st; | |
int server, client, val, fd, r, total = 0; | |
struct timeval timeout = {1, 0}; | |
unsigned short port; | |
int (*shellcode)(); | |
if (argc > 1) { | |
if (stat(argv[1], &st) == 0) { | |
/* We have a file */ | |
len = (st.st_size + 4096 - 1) & ~(4096-1); | |
if ((fd = open(argv[1], O_RDWR)) >= 0) { | |
if ((shellcode = mmap(NULL, len, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE, fd, 0)) != MAP_FAILED) { | |
shellcode(); | |
munmap(shellcode, len); | |
} | |
close(fd); | |
} | |
} else if ((port = atoi(argv[1])) >= 1024) { | |
/* We have a port */ | |
signal(SIGCHLD, child_died); | |
shellcode = mmap(NULL, 4096 * 8, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); | |
if (shellcode == MAP_FAILED) { | |
fprintf(stderr, "Could not map memory.\n"); | |
return 1; | |
} | |
if ((server = create_server(port)) >= 0) { | |
while ((client = accept(server, NULL, NULL)) >= 0) { | |
#if defined(FORK_SERVER) | |
pid = fork(); | |
if (pid) { | |
/* Parent */ | |
close(client); | |
} else { | |
/* Child */ | |
close(server); | |
#endif | |
read(client, shellcode + total, 4096 * 8 - total); | |
val = shellcode(); | |
close(client); | |
#if defined(FORK_SERVER) | |
} | |
#endif | |
} | |
} else { | |
fprintf(stderr, "Could not create server.\n"); | |
} | |
munmap(shellcode, 4096 * 8); | |
} else { | |
fprintf(stderr, "%s is not a readable file and not a usable port.\n", argv[1]); | |
return 1; | |
} | |
} | |
return 0; | |
} |
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