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--- ./src/ngircd/irc-login.c.orig
+++ ./src/ngircd/irc-login.c
@@ -421,9 +421,9 @@
/* User name: only alphanumeric characters are allowed! */
ptr = Req->argv[0];
while (*ptr) {
- if ((*ptr < '0' || *ptr > '9') &&
- (*ptr < 'A' || *ptr > 'Z') &&
- (*ptr < 'a' || *ptr > 'z')) {
+ if (!isalnum((int)*ptr) &&
+ *ptr != '+' && *ptr != '-' && *ptr != '@' &&
+ *ptr != '.' && *ptr != '_') {
Conn_Close(Client_Conn(Client), NULL,
"Invalid user name", true);
return DISCONNECTED;
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