+ if(!x) { /* System error: complain */
+ logger(LOG_ERR, "Failed to read `%s': %s", fname, strerror(errno));
+ }
+
+ free(fname);
+
+ return x;
+}
+
+FILE *ask_and_open(const char *filename, const char *what) {
+ FILE *r;
+ char *directory;
+ char line[PATH_MAX];
+ const char *fn;
+
+ /* Check stdin and stdout */
+ if(!isatty(0) || !isatty(1)) {
+ /* Argh, they are running us from a script or something. Write
+ the files to the current directory and let them burn in hell
+ for ever. */
+ fn = filename;
+ } else {
+ /* Ask for a file and/or directory name. */
+ fprintf(stdout, "Please enter a file to save %s to [%s]: ",
+ what, filename);
+ fflush(stdout);
+
+ fn = readline(stdin, line, sizeof line);
+
+ if(!fn) {
+ fprintf(stderr, "Error while reading stdin: %s\n",
+ strerror(errno));
+ return NULL;
+ }
+
+ if(!strlen(fn))
+ /* User just pressed enter. */
+ fn = filename;
+ }
+
+#ifdef HAVE_MINGW
+ if(fn[0] != '\\' && fn[0] != '/' && !strchr(fn, ':')) {
+#else
+ if(fn[0] != '/') {
+#endif
+ /* The directory is a relative path or a filename. */
+ char *p;
+
+ directory = get_current_dir_name();
+ xasprintf(&p, "%s/%s", directory, fn);
+ free(directory);
+ fn = p;
+ }
+
+ umask(0077); /* Disallow everything for group and other */
+
+ /* Open it first to keep the inode busy */
+
+ r = fopen(fn, "r+") ?: fopen(fn, "w+");
+
+ if(!r) {
+ fprintf(stderr, "Error opening file `%s': %s\n",
+ fn, strerror(errno));
+ return NULL;
+ }
+
+ return r;
+}
+
+bool disable_old_keys(FILE *f) {
+ char buf[100];
+ long pos;
+ bool disabled = false;
+
+ rewind(f);
+ pos = ftell(f);
+
+ while(fgets(buf, sizeof buf, f)) {
+ if(!strncmp(buf, "-----BEGIN RSA", 14)) {
+ buf[11] = 'O';
+ buf[12] = 'L';
+ buf[13] = 'D';
+ fseek(f, pos, SEEK_SET);
+ fputs(buf, f);
+ disabled = true;
+ }
+ else if(!strncmp(buf, "-----END RSA", 12)) {
+ buf[ 9] = 'O';
+ buf[10] = 'L';
+ buf[11] = 'D';
+ fseek(f, pos, SEEK_SET);
+ fputs(buf, f);
+ disabled = true;
+ }
+ pos = ftell(f);
+ }