99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* Copyright 2011 Stefan Lankes
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* Chair for Operating Systems, RWTH Aachen University
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#define PORT 4711
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int main(int argc, char* argv[])
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{
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int sockd, sockd2;
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unsigned int addrlen;
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struct sockaddr_in my_name, peer_name;
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int status;
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pid_t pid;
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/* create a socket */
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sockd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockd == -1)
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{
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perror("Socket creation error");
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exit(1);
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}
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memset(&my_name, 0x00, sizeof(my_name));
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/* server address */
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my_name.sin_family = AF_INET;
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my_name.sin_addr.s_addr = INADDR_ANY;
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my_name.sin_port = htons(PORT);
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status = bind(sockd, (struct sockaddr*)&my_name, sizeof(my_name));
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if (status == -1)
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{
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perror("Binding error");
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exit(1);
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}
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status = listen(sockd, 5);
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if (status == -1)
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{
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perror("Listening error");
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exit(1);
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}
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while(1)
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{
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/* wait for a connection */
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addrlen = sizeof(peer_name);
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sockd2 = accept(sockd, (struct sockaddr*)&peer_name, &addrlen);
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if (sockd2 == -1)
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{
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perror("Wrong connection");
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exit(1);
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}
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pid = fork();
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if (pid == 0) { // child
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char* newargs[] = {"/bin/mshell", NULL};
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char* newenv[] = {"USER=root", "PATH=/bin:/sbin:/usr/bin", "PWD=/", "TEMP=/tmp", NULL};
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// set stdout, stdin and stderr to the socket descriptor
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dup2(sockd2, STDIN_FILENO);
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dup2(sockd2, STDOUT_FILENO);
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dup2(sockd2, STDERR_FILENO);
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close(sockd2);
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execve("/bin/mshell", newargs, newenv);
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return errno;
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}
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close(sockd2);
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}
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return 0;
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}
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