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-rw-r--r--cqrlogo.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/cqrlogo.c b/cqrlogo.c
index b76fb13..43e353f 100644
--- a/cqrlogo.c
+++ b/cqrlogo.c
@@ -66,6 +66,7 @@ int main(int argc, char **argv) {
gchar *buffer;
gsize size;
+ /* check if we have environment variables from CGI */
if ((http_referer = getenv("HTTP_REFERER")) == NULL ||
(server_name = getenv("SERVER_NAME")) == NULL) {
printf("This is a CGI executable. Running without a web service is not supported.\n"
@@ -73,13 +74,14 @@ int main(int argc, char **argv) {
return EXIT_FAILURE;
}
+ /* prepare pattern matching */
pattern = malloc(11 + strlen(server_name));
sprintf(pattern, "^http://%s/", server_name);
if ((rc = regcomp(&preg, pattern, 0)) != 0)
printf("regcomp() failed, returning nonzero (%d)\n", rc);
+ /* check if the QR-Code is for the correct server */
if ((rc = regexec(&preg, http_referer, nmatch, pmatch, 0)) != 0) {
- /* stolen... */
http_referer = malloc(44 + strlen(server_name));
sprintf(http_referer, "This QR Code has been stolen from http://%s/!", server_name);
}