utils: Refactor get_name's functionality into util for global access

[tinc] / src / utils.c

diff --git a/src/utils.c b/src/utils.c
index 0d7bc02..797bc3f 100644 (file)
--- a/src/utils.c
+++ b/src/utils.c
@@ -19,6 +19,7 @@
 */
 
 #include "system.h"
+#include "xalloc.h"
 
 #include "../src/logger.h"
 #include "utils.h"
@@ -179,3 +180,38 @@ unsigned int bitfield_to_int(const void *bitfield, size_t size) {
        memcpy(&value, bitfield, size);
        return value;
 }
+
+char *replace_name(const char *name) {
+       char *ret_name;
+
+       if (name[0] == '$') {
+               char *envname = getenv(name + 1);
+               char hostname[HOST_NAME_MAX+1];
+               if (!envname) {
+                       if (strcmp(name + 1, "HOST")) {
+                               logger(DEBUG_ALWAYS, LOG_ERR, "Invalid Name: environment variable %s does not exist\n", name + 1);
+                               return NULL;
+                       }
+                       if (gethostname(hostname, sizeof hostname) || !*hostname) {
+                               logger(DEBUG_ALWAYS, LOG_ERR, "Could not get hostname: %s\n", sockstrerror(sockerrno));
+                               return NULL;
+                       }
+                       hostname[HOST_NAME_MAX] = 0;
+                       envname = hostname;
+               }
+               ret_name = xstrdup(envname);
+               for (char *c = ret_name; *c; c++)
+                       if (!isalnum(*c))
+                               *c = '_';
+       } else {
+               ret_name = xstrdup(name);
+       }
+
+       if (!check_id(ret_name)) {
+               logger(DEBUG_ALWAYS, LOG_ERR, "Invalid name for myself!");
+               free(ret_name);
+               return NULL;
+       }
+
+       return ret_name;
+}