Version v0.2.58 - Completed refactoring to new OTP thumb drive detection approach

otp.c

@@ -39,15 +39,21 @@ static const int base64_decode_table[256] = {
 #define MAX_LINE_LENGTH 1024
 #define MAX_HASH_LENGTH 65
 #define PROGRESS_UPDATE_INTERVAL (64 * 1024 * 1024)  // 64MB intervals
-#define PADS_DIR "pads"
+#define DEFAULT_PADS_DIR "pads"
 #define FILES_DIR "files"
 #define MAX_ENTROPY_BUFFER 32768  // 32KB entropy buffer
 
+// Global variable for current pads directory (can be local or OTP thumb drive)
+static char current_pads_dir[512] = DEFAULT_PADS_DIR;
+
 // Function prototypes
 int main(int argc, char* argv[]);
 int interactive_mode(void);
 int command_line_mode(int argc, char* argv[]);
 
+// OTP thumb drive detection function
+int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size);
+
 // Editor and file manager functions
 char* get_preferred_editor(void);
 char* get_preferred_file_manager(void);
@@ -103,9 +109,21 @@ int handle_file_encrypt(void);
 // Enhanced input functions
 int get_filename_with_default(const char* prompt, const char* default_path, char* result, size_t result_size);
 
+// Directory display functions
+void get_directory_display(const char* file_path, char* result, size_t result_size);
+
 void print_usage(const char* program_name);
 
 int main(int argc, char* argv[]) {
+    // Check for OTP thumb drive on startup
+    char otp_drive_path[512];
+    if (detect_otp_thumb_drive(otp_drive_path, sizeof(otp_drive_path))) {
+        printf("Detected OTP thumb drive: %s\n", otp_drive_path);
+        printf("Using as default pads directory for this session.\n\n");
+        strncpy(current_pads_dir, otp_drive_path, sizeof(current_pads_dir) - 1);
+        current_pads_dir[sizeof(current_pads_dir) - 1] = '\0';
+    }
+    
     if (argc == 1) {
         return interactive_mode();
     } else {
@@ -629,9 +647,9 @@ uint64_t parse_size_string(const char* size_str) {
 }
 
 char* find_pad_by_prefix(const char* prefix) {
-    DIR* dir = opendir(PADS_DIR);
+    DIR* dir = opendir(current_pads_dir);
     if (!dir) {
-        printf("Error: Cannot open pads directory\n");
+        printf("Error: Cannot open pads directory %s\n", current_pads_dir);
         return NULL;
     }
     
@@ -665,10 +683,9 @@ char* find_pad_by_prefix(const char* prefix) {
             int current = 0;
             rewinddir(dir);
             while ((entry = readdir(dir)) != NULL) {
-                // Skip . and .. entries, and only process .pad files
                 if (entry->d_name[0] == '.') continue;
                 if (!strstr(entry->d_name, ".pad")) continue;
-                if (strlen(entry->d_name) != 68) continue; // 64 char chksum + ".pad"
+                if (strlen(entry->d_name) != 68) continue;
                 
                 current++;
                 if (current == selection) {
@@ -729,9 +746,9 @@ char* find_pad_by_prefix(const char* prefix) {
 }
 
 int list_available_pads(void) {
-    DIR* dir = opendir(PADS_DIR);
+    DIR* dir = opendir(current_pads_dir);
     if (!dir) {
-        printf("Error: Cannot open pads directory\n");
+        printf("Error: Cannot open pads directory %s\n", current_pads_dir);
         return 0;
     }
     
@@ -751,7 +768,7 @@ int list_available_pads(void) {
             
             // Get pad file size
             char full_path[300]; // Increased buffer size to accommodate longer paths
-            snprintf(full_path, sizeof(full_path), "%s/%s", PADS_DIR, entry->d_name);
+            snprintf(full_path, sizeof(full_path), "%s/%s", current_pads_dir, entry->d_name);
             struct stat st;
             if (stat(full_path, &st) == 0) {
                 // Get used bytes from state
@@ -2079,7 +2096,7 @@ int decrypt_ascii_file(const char* input_file, const char* output_file) {
 
 int read_state_offset(const char* pad_chksum, uint64_t* offset) {
     char state_filename[MAX_HASH_LENGTH + 20];
-    snprintf(state_filename, sizeof(state_filename), "%s/%s.state", PADS_DIR, pad_chksum);
+    snprintf(state_filename, sizeof(state_filename), "%s/%s.state", current_pads_dir, pad_chksum);
     
     FILE* state_file = fopen(state_filename, "rb");
     if (!state_file) {
@@ -2099,7 +2116,7 @@ int read_state_offset(const char* pad_chksum, uint64_t* offset) {
 
 int write_state_offset(const char* pad_chksum, uint64_t offset) {
     char state_filename[MAX_HASH_LENGTH + 20];
-    snprintf(state_filename, sizeof(state_filename), "%s/%s.state", PADS_DIR, pad_chksum);
+    snprintf(state_filename, sizeof(state_filename), "%s/%s.state", current_pads_dir, pad_chksum);
     
     FILE* state_file = fopen(state_filename, "wb");
     if (!state_file) {
@@ -2240,8 +2257,8 @@ int collect_keyboard_entropy(unsigned char* entropy_buffer, size_t max_size, siz
 // Directory management functions
 int ensure_pads_directory(void) {
     struct stat st = {0};
-    if (stat(PADS_DIR, &st) == -1) {
+    if (stat(current_pads_dir, &st) == -1) {
-        if (mkdir(PADS_DIR, 0755) != 0) {
+        if (mkdir(current_pads_dir, 0755) != 0) {
             return 1;
         }
     }
@@ -2272,10 +2289,74 @@ void get_default_file_path(const char* filename, char* result_path, size_t resul
 }
 
 void get_pad_path(const char* chksum, char* pad_path, char* state_path) {
-    snprintf(pad_path, MAX_HASH_LENGTH + 20, "%s/%s.pad", PADS_DIR, chksum);
+    snprintf(pad_path, MAX_HASH_LENGTH + 20, "%s/%s.pad", current_pads_dir, chksum);
-    snprintf(state_path, MAX_HASH_LENGTH + 20, "%s/%s.state", PADS_DIR, chksum);
+    snprintf(state_path, MAX_HASH_LENGTH + 20, "%s/%s.state", current_pads_dir, chksum);
 }
 
+// OTP thumb drive detection function implementation
+int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size) {
+    const char* mount_dirs[] = {"/media", "/run/media", "/mnt", NULL};
+    
+    for (int mount_idx = 0; mount_dirs[mount_idx] != NULL; mount_idx++) {
+        DIR* mount_dir = opendir(mount_dirs[mount_idx]);
+        if (!mount_dir) continue;
+        
+        struct dirent* mount_entry;
+        while ((mount_entry = readdir(mount_dir)) != NULL) {
+            if (mount_entry->d_name[0] == '.') continue;
+            
+            // Check if drive name starts with "OTP"
+            if (strncmp(mount_entry->d_name, "OTP", 3) != 0) continue;
+            
+            char mount_path[512];
+            snprintf(mount_path, sizeof(mount_path), "%s/%s", mount_dirs[mount_idx], mount_entry->d_name);
+            
+            // For /run/media, we need to go one level deeper (skip username)
+            if (strcmp(mount_dirs[mount_idx], "/run/media") == 0) {
+                DIR* user_dir = opendir(mount_path);
+                if (!user_dir) continue;
+                
+                struct dirent* user_entry;
+                while ((user_entry = readdir(user_dir)) != NULL) {
+                    if (user_entry->d_name[0] == '.') continue;
+                    
+                    // Check if drive name starts with "OTP"
+                    if (strncmp(user_entry->d_name, "OTP", 3) != 0) continue;
+                    
+                    char user_mount_path[512];
+                    snprintf(user_mount_path, sizeof(user_mount_path), "%s/%s", mount_path, user_entry->d_name);
+                    
+                    // Check if this is a readable directory
+                    DIR* drive_dir = opendir(user_mount_path);
+                    if (drive_dir) {
+                        closedir(drive_dir);
+                        strncpy(otp_drive_path, user_mount_path, path_size - 1);
+                        otp_drive_path[path_size - 1] = '\0';
+                        closedir(user_dir);
+                        closedir(mount_dir);
+                        return 1; // Found OTP drive
+                    }
+                }
+                closedir(user_dir);
+            } else {
+                // Direct mount point (like /media/OTP_DRIVE or /mnt/OTP_DRIVE)
+                DIR* drive_dir = opendir(mount_path);
+                if (drive_dir) {
+                    closedir(drive_dir);
+                    strncpy(otp_drive_path, mount_path, path_size - 1);
+                    otp_drive_path[path_size - 1] = '\0';
+                    closedir(mount_dir);
+                    return 1; // Found OTP drive
+                }
+            }
+        }
+        closedir(mount_dir);
+    }
+    
+    return 0; // No OTP drive found
+}
+
+
 
 
 // Custom base64 encode function
@@ -2829,10 +2910,10 @@ int handle_file_encrypt(void) {
 int handle_pads_menu(void) {
     printf("\n=== Pad Management ===\n");
     
-    // Get list of all pads
+    // Get list of pads from current directory
-    DIR* dir = opendir(PADS_DIR);
+    DIR* dir = opendir(current_pads_dir);
     if (!dir) {
-        printf("Error: Cannot open pads directory\n");
+        printf("Error: Cannot open pads directory %s\n", current_pads_dir);
         return 1;
     }
     
@@ -2842,6 +2923,7 @@ int handle_pads_menu(void) {
         char size_str[32];
         char used_str[32];
         double percentage;
+        char location[256];  // Store location info
     };
     
     struct PadInfo pads[100];  // Support up to 100 pads
@@ -2855,8 +2937,8 @@ int handle_pads_menu(void) {
             pads[pad_count].chksum[64] = '\0';
             
             // Get pad file size and usage info
-            char full_path[300];
+            char full_path[512];
-            snprintf(full_path, sizeof(full_path), "%s/%s", PADS_DIR, entry->d_name);
+            snprintf(full_path, sizeof(full_path), "%s/%s", current_pads_dir, entry->d_name);
             struct stat st;
             if (stat(full_path, &st) == 0) {
                 // Get used bytes from state
@@ -2888,6 +2970,9 @@ int handle_pads_menu(void) {
                 // Calculate percentage
                 pads[pad_count].percentage = (double)used_bytes / st.st_size * 100.0;
                 
+                // Set location info using directory display
+                get_directory_display(full_path, pads[pad_count].location, sizeof(pads[pad_count].location));
+                
                 pad_count++;
             }
         }
@@ -2943,14 +3028,19 @@ int handle_pads_menu(void) {
     
     // Display pads with minimal prefixes underlined
     printf("\nAvailable pads:\n");
-    printf("%-20s %-12s %-12s %-8s\n", "ChkSum", "Size", "Used", "% Used");
+    printf("%-8s %-12s %-12s %-12s %-8s\n", "ChkSum", "Dir", "Size", "Used", "% Used");
-    printf("%-20s %-12s %-12s %-8s\n", "-------------------", "----------", "----------", "------");
+    printf("%-8s %-12s %-12s %-12s %-8s\n", "--------", "------------", "----------", "----------", "------");
     
     for (int i = 0; i < pad_count; i++) {
-        // Display checksum with prefix underlined
+        // Display first 8 characters of checksum with prefix underlined
-        printf("\033[4m%.*s\033[0m%-*s %-12s %-12s %.1f%%\n",
+        char checksum_8char[9];
-               prefix_lengths[i], pads[i].chksum,  // Underlined prefix
+        strncpy(checksum_8char, pads[i].chksum, 8);
-               20 - prefix_lengths[i], pads[i].chksum + prefix_lengths[i], // Rest of checksum with padding
+        checksum_8char[8] = '\0';
+        
+        printf("\033[4m%.*s\033[0m%s %-12s %-12s %-12s %.1f%%\n",
+               prefix_lengths[i], checksum_8char,  // Underlined prefix
+               checksum_8char + prefix_lengths[i], // Rest of 8-char checksum
+               pads[i].location,                   // Use the stored location info
                pads[i].size_str,
                pads[i].used_str,
                pads[i].percentage);
@@ -3019,6 +3109,121 @@ int handle_pads_menu(void) {
     return handle_pads_menu();
 }
 
+void get_directory_display(const char* file_path, char* result, size_t result_size) {
+    // Extract directory path from full file path
+    char dir_path[512];
+    char* last_slash = strrchr(file_path, '/');
+    
+    if (last_slash) {
+        size_t dir_len = last_slash - file_path;
+        if (dir_len >= sizeof(dir_path)) {
+            dir_len = sizeof(dir_path) - 1;
+        }
+        strncpy(dir_path, file_path, dir_len);
+        dir_path[dir_len] = '\0';
+    } else {
+        // No directory separator, assume current directory
+        strcpy(dir_path, ".");
+    }
+    
+    // USB Drive Detection and Smart Shortening
+    char* home_dir = getenv("HOME");
+    
+    // Check for USB/removable media mount patterns
+    if (strstr(dir_path, "/media/") || strstr(dir_path, "/run/media/") || strstr(dir_path, "/mnt/")) {
+        // Extract USB label/name
+        char* media_start = NULL;
+        if (strstr(dir_path, "/media/")) {
+            media_start = strstr(dir_path, "/media/");
+        } else if (strstr(dir_path, "/run/media/")) {
+            media_start = strstr(dir_path, "/run/media/");
+        } else if (strstr(dir_path, "/mnt/")) {
+            media_start = strstr(dir_path, "/mnt/");
+        }
+        
+        if (media_start) {
+            // Find the USB label part
+            char* path_after_media = strchr(media_start + 1, '/');
+            if (path_after_media) {
+                path_after_media++; // Skip the slash
+                
+                // For /run/media/user/LABEL pattern, skip the username
+                if (strstr(media_start, "/run/media/")) {
+                    char* next_slash = strchr(path_after_media, '/');
+                    if (next_slash) {
+                        path_after_media = next_slash + 1;
+                    }
+                }
+                
+                // Extract just the USB label (up to next slash or end)
+                char* label_end = strchr(path_after_media, '/');
+                if (label_end) {
+                    size_t label_len = label_end - path_after_media;
+                    if (label_len > 11) label_len = 11; // Max 11 chars for display
+                    strncpy(result, path_after_media, label_len);
+                    result[label_len] = '\0';
+                } else {
+                    // USB label is the last part
+                    strncpy(result, path_after_media, result_size - 1);
+                    result[result_size - 1] = '\0';
+                }
+                return;
+            }
+        }
+    }
+    
+    // Home directory shortening
+    if (home_dir && strncmp(dir_path, home_dir, strlen(home_dir)) == 0) {
+        if (dir_path[strlen(home_dir)] == '/' || dir_path[strlen(home_dir)] == '\0') {
+            // Replace home directory with ~
+            char temp[512];
+            snprintf(temp, sizeof(temp), "~%s", dir_path + strlen(home_dir));
+            
+            // If result is too long, truncate intelligently
+            if (strlen(temp) > 11) {
+                // Show ~/...end_part
+                char* last_part = strrchr(temp, '/');
+                if (last_part && strlen(last_part) < 8) {
+                    snprintf(result, result_size, "~...%s", last_part);
+                } else {
+                    strncpy(result, temp, 11);
+                    result[11] = '\0';
+                }
+            } else {
+                strncpy(result, temp, result_size - 1);
+                result[result_size - 1] = '\0';
+            }
+            return;
+        }
+    }
+    
+    // Current working directory
+    if (strcmp(dir_path, ".") == 0 || strcmp(dir_path, PADS_DIR) == 0) {
+        strncpy(result, "pads", result_size - 1);
+        result[result_size - 1] = '\0';
+        return;
+    }
+    
+    // System/other paths - smart truncation with ellipsis
+    if (strlen(dir_path) > 11) {
+        // Try to show the most meaningful part
+        char* last_part = strrchr(dir_path, '/');
+        if (last_part && strlen(last_part) < 9) {
+            // Show .../last_part
+            snprintf(result, result_size, "...%s", last_part);
+        } else {
+            // Show first part with ellipsis
+            strncpy(result, dir_path, 8);
+            strncpy(result + 8, "...", result_size - 8 - 1);
+            result[result_size - 1] = '\0';
+        }
+    } else {
+        // Short enough, use as-is
+        strncpy(result, dir_path, result_size - 1);
+        result[result_size - 1] = '\0';
+    }
+}
+
 void print_usage(const char* program_name) {
     printf("OTP Cipher - One Time Pad Implementation %s\n", get_version());
     printf("%s\n", get_build_info());