Steve Kemp's Blog Writings relating to Debian & Free Software

IPv6 and thttpd

Friday, 8 April 2011

thttpd is a simple, small, portable, fast, and secure HTTP server which supports both IPv4 & IPv6.

However one noticable omission in the handling of requests for thttpd is support for the X-Forwarded-For header - which is even noted upo nthe thttpd wikipedia entry.

There is a simple patch floating around which claims to fix this; but as I belatedly noticed tonight it only works for IPv4.

If you look at libhttpd.h of the thttpd source you'll see this:

typedef union {
    struct sockaddr sa;
    struct sockaddr_in sa_in;
#ifdef USE_IPV6
    struct sockaddr_in6 sa_in6;
    struct sockaddr_storage sa_stor;
#endif /* USE_IPV6 */
    } httpd_sockaddr;

As a quick hack I updated this structure to add the following member:

    char real_ip[200];

Now I could update that member when a client connects and later update it as a result of any X-Forwarded-For: headers which might be present in incoming requests. Finally I updated the logging to use this field rather than anything else and the job was complete.

Without this work if you're running as a proxy and you receive an IPv6 connection you'll see it reported as

I'm sure my approach isn't as clean as it could be - due to the extra member- but it will suffice for now.

ObQuote: "This gun you're holding belonged to your father; he could conduct a symphony orchestra with it. " - Wanted

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