Adaugă fișierele specifice laboratorului II

Author: iosifache

labs/vuln/exercises/code-review/Makefile

@@ -0,0 +1,15 @@
+all: clean build
+
+build: build-line-appender build-ping-google-dns build-santa-letters
+
+build-line-appender:
+	gcc -m32 -Wall -no-pie -O0 line-appender.c -o line-appender.elf
+
+build-ping-google-dns:
+	gcc -m32 -Wall -no-pie -O0 ping-google-dns.c -o ping-google-dns.elf
+
+build-santa-letters:
+	gcc -m32 -Wall -no-pie -O0 santa-letters.c -o santa-letters.elf
+
+clean:
+	rm -f *.elf

labs/vuln/exercises/code-review/line-appender.c

@@ -0,0 +1,39 @@
+#include <stdio.h>
+
+void append_files(char source_filename[], char destination_filename[]){
+    FILE *source, *destination;
+    char buf[100];
+
+    source = fopen(source_filename, "r");
+    destination = fopen(destination_filename, "a+");
+
+    if (!source && !destination) {
+        printf("[!] Files cannot be accessed.\n");
+
+        return;
+    }
+    else{
+        printf("[!] Appending the content of %s to %s.", source_filename, destination_filename);
+    }
+
+    fprintf(destination, "\n");
+
+    fgets(buf, sizeof(buf), source);
+    fprintf(destination, "%s", buf);
+}
+
+int main(int argc, char *argv[]){
+    char *source, *destination;
+
+    if (argc != 3){
+        printf("[!] Source and destination files were not provided.\n");
+
+        return -1;
+    }
+    source = argv[1];
+    destination = argv[2];
+
+    append_files(source, destination);
+
+    return 0;
+}

labs/vuln/exercises/code-review/ping-google-dns.c

@@ -0,0 +1,25 @@
+#include <string.h> 
+#include <stdio.h> 
+#include <stdlib.h>
+
+#define FIRST_SERVER "8.8.8.8"
+#define SECOND_SERVER "8.8.4.4"
+
+int main(){
+    char ip[32];
+    char command[64] = "ping -c 1 ";
+
+    printf("[+] Google DNS IP you want to ping is: ");
+    scanf("%31s", ip);
+
+    if (strncmp(ip, FIRST_SERVER, sizeof(FIRST_SERVER) - 1) == 0 || strncmp(ip, SECOND_SERVER, sizeof(SECOND_SERVER) - 1) == 0){
+        printf("[+] Ping output is:\n\n");
+
+        strcat(command, ip);
+        system(command);
+    }
+    else{
+        printf("[!] Invalid IP address\n");
+    }
+
+} 

labs/vuln/exercises/code-review/santa-letters.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int gifts_count = 32;
+
+void print_letter(char *name) {
+
+    // Print the letter
+    printf("\033[31mDear Santa Claus,\n\n");
+    printf("My name is:\n\n\t");
+    printf(name);
+    printf("\n\nI swear I was a good kid, doing all my homework and getting good "
+           "grades on all my tests. The only mistake I made this year was "
+           "omitting the printf(%%s) usage class :(. As a "
+           "result, I think I am deserving of %d gifts.\n\n", gifts_count);
+    printf("Hope to see you on Christmas!\n\033[0m");
+}
+
+int main(int argc, char *argv[]) {
+    int helper = &gifts_count;
+
+    // Check the number of arguments
+    if (argc != 2) {
+        printf("Usage: %s FULL_NAME\n", argv[0]);
+
+        exit(1);
+    }
+
+    print_letter(argv[1]);
+}