caperren/school_archives
1
0
Fork 0
mirror of https://github.com/caperren/school_archives.git synced 2025-11-09 21:51:15 +00:00
Code Issues Packages Projects Releases Wiki Activity

Added work from my other class repositories before deletion

Browse Source
This commit is contained in:
Corwin Perren
2017-11-29 10:28:24 -08:00
parent cb0b5f4d25
commit 5ea24c81b5
198 changed files with 739603 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

296
OSU Coursework/CS 344 - Operating Systems I/Assignment 4 - OTP/otp_dec.c Normal file
View File

@@ -0,0 +1,296 @@
/*
* File: otp_enc.c
* Author: Corwin Perren
*
* Created on November 29, 2016, 7:26 PM
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string.h>
#define PROGRAM_SUCCESS 0
#define PROGRAM_FAILURE 1
#define PROGRAM_FAILURE_PORT 2
#define PORT_MAX 65535
#define PORT_MIN 0
#define OTP_ENC_IDENT "#"
#define OTP_DEC_IDENT "$"
#define TEXT_DONE "@@"
#define OTP_FAILURE "%"
#define OTP_CONTINUE "&"
#define LETTER_OPTIONS 27
int letter_number_assignment[LETTER_OPTIONS][2] = {
'A', 10,
'B', 11,
'C', 12,
'D', 13,
'E', 14,
'F', 15,
'G', 16,
'H', 17,
'I', 18,
'J', 19,
'K', 20,
'L', 21,
'M', 22,
'N', 23,
'O', 24,
'P', 25,
'Q', 26,
'R', 0,
'S', 1,
'T', 2,
'U', 3,
'V', 4,
'W', 5,
'X', 6,
'Y', 7,
'Z', 8,
' ', 9
};
int get_mapped_num_from_char(char letter);
int main(int argc, char** argv) {
int comms_sfd;
unsigned long int comms_port_number; //0 - 65535
struct hostent *server;
struct sockaddr_in server_address;
FILE *input_file;
FILE *key_file;
//Verify correct number of arguments
if(argc < 4){
fprintf(stderr, "Not enough arguments provided. Exiting...\n");
fprintf(stderr, "Correct usage: "
"%s input_file key_file port\n", argv[0]);
exit(PROGRAM_FAILURE);
}else if(argc > 4){
fprintf(stderr, "Extra arguments entered. Ignoring all but the first "
"three.\n");
}
//Get port number, and make sure it's valid
comms_port_number = atoi(argv[3]);
if((comms_port_number > PORT_MAX) || (comms_port_number < PORT_MIN)){
fprintf(stderr, "Port out of range! Please choose a different port! "
"Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Open the files
input_file = fopen(argv[1], "r");
key_file = fopen(argv[2], "r");
//Make sure they opened successfully
if(input_file == NULL){
fprintf(stderr, "Input file does not exist or cannot be read! "
"Exiting...\n");
exit(PROGRAM_FAILURE);
}else if(key_file == NULL){
fprintf(stderr, "Key file does not exist or cannot be read! "
"Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Read in input file
char* temp_buffer = malloc(sizeof(char) * 1000000);
memset(temp_buffer, '\0', sizeof(char) * 1000000);
fgets(temp_buffer, 1000000, input_file);
char* input_text = malloc(sizeof(char) * (strlen(temp_buffer) + 1));
memset(input_text, '\0', sizeof(char) * (strlen(temp_buffer) + 1));
strcpy(input_text, temp_buffer);
//Remove input file newline
int input_str_len = strlen(input_text);
if(input_text[input_str_len - 1] == '\n'){
input_text[input_str_len - 1] = '\0';
}
//Read in key file
memset(temp_buffer, '\0', sizeof(char) * 1000000);
fgets(temp_buffer, 1000000, key_file);
char* key_text = malloc(sizeof(char) * (strlen(temp_buffer) + 1));
memset(key_text, '\0', sizeof(char) * (strlen(temp_buffer) + 1));
strcpy(key_text, temp_buffer);
//Remove input file newline
input_str_len = strlen(key_text);
if(key_text[input_str_len - 1] == '\n'){
key_text[input_str_len - 1] = '\0';
}
free(temp_buffer);
//Exit as error is input_string is longer than the key
if(strlen(input_text) > strlen(key_text)){
fprintf(stderr, "Key file too small. Please try again with larger "
"file. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Check files for bad characters
for(unsigned long i = 0 ; i < strlen(input_text) ; i ++){
if(get_mapped_num_from_char(input_text[i]) == -1){
fprintf(stderr, "Bad characters in input text. Exiting...\n");
exit(PROGRAM_FAILURE);
}
}
for(unsigned long i = 0 ; i < strlen(key_text) ; i ++){
if(get_mapped_num_from_char(key_text[i]) == -1){
fprintf(stderr, "Bad characters in key text. Exiting...\n");
exit(PROGRAM_FAILURE);
}
}
//Create listening socket, check if created successfully
comms_sfd = socket(AF_INET, SOCK_STREAM, 0);
if(comms_sfd < 0){
fprintf(stderr, "Could not create comms socket! Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Get localhost as server, check if valid
server = gethostbyname("localhost");
if(server == NULL){
fprintf(stderr, "localhost is not a valid host! Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Set up comms parameters for the server we're connecting to.
memset((char *)&server_address, '\0', sizeof(server_address));
server_address.sin_port = htons(comms_port_number);
memcpy(&server_address.sin_addr, server->h_addr_list[0], server->h_length);
server_address.sin_family = AF_INET;
//Make the server connection and verify it didn't fail.
int connect_result = connect(comms_sfd, \
(struct sockaddr *)&server_address, \
sizeof(server_address));
if(connect_result < 0){
fprintf(stderr, "Connection failed! Is the port correct? Exiting...\n");
exit(PROGRAM_FAILURE_PORT);
}
//Set up writing and reading variables
int read_return;
int write_return;
unsigned int concat_index = 0;
char read_buffer[10];
char* concat_buffer = malloc(sizeof(char) * 1000000);
memset(read_buffer, '\0', 1);
memset(concat_buffer, '\0', sizeof(char) * 1000000);
//Write message to tell the daemon what program we are
write_return = write(comms_sfd, OTP_DEC_IDENT TEXT_DONE, 3);
if(write_return < 0){
fprintf(stderr, "Failed to write data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Read the servers response to our message
while(strstr(concat_buffer, TEXT_DONE) == NULL){
read_return = read(comms_sfd, read_buffer, 1);
if(read_return != -1){
concat_buffer[concat_index] = read_buffer[0];
concat_index++;
}
}
if(strstr(concat_buffer, OTP_CONTINUE TEXT_DONE) != NULL){
//In this case, the response from the server is to continue
//We write the input text to the daemon
write_return = write(comms_sfd, input_text, strlen(input_text));
if(write_return < 0){
fprintf(stderr, "Failed to write data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Then we write the ending characters
write_return = write(comms_sfd, TEXT_DONE, 2);
if(write_return < 0){
fprintf(stderr, "Failed to write data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Now we write the key file to the daemon
write_return = write(comms_sfd, key_text, strlen(key_text));
if(write_return < 0){
fprintf(stderr, "Failed to write data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//And the ending characters again
write_return = write(comms_sfd, TEXT_DONE, 2);
if(write_return < 0){
fprintf(stderr, "Failed to write data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
//Reset variables to receive data
concat_index = 0;
memset(read_buffer, '\0', 10);
memset(concat_buffer, '\0', sizeof(char) * 1000000);
//Read in the response from the daemon
while(strstr(concat_buffer, TEXT_DONE) == NULL){
read_return = read(comms_sfd, read_buffer, 1);
if(read_return != -1){
concat_buffer[concat_index] = read_buffer[0];
concat_index++;
}
}
//Null out our marker characters
int input_string_length = strlen(concat_buffer);
concat_buffer[input_string_length-1] = '\0';
concat_buffer[input_string_length-2] = '\0';
//Print out the cleaned up response from the daemon
for(int i = 0 ; i < strlen(concat_buffer) ; i++){
printf("%c", concat_buffer[i]);
}
printf("\n");
}else if(strstr(concat_buffer, OTP_FAILURE TEXT_DONE) != NULL){
//Print an error if we try to connect to the wrong daemon
fprintf(stderr, "OTP_DEC may NOT connect to OTP_ENC_D. Exiting...\n");
exit(PROGRAM_FAILURE);
}else{
//Print an error if we get erroneous data.
fprintf(stderr, "Got bad data. Exiting...\n");
exit(PROGRAM_FAILURE);
}
exit(PROGRAM_SUCCESS);
}
int get_mapped_num_from_char(char letter){
for(int i = 0 ; i < LETTER_OPTIONS ; i++){
if(letter == letter_number_assignment[i][0]){
return letter_number_assignment[i][1];
}
}
return -1;
}