Andre Oppermann wrote:
> andre 2007-05-18 19:58:37 UTC
>
> FreeBSD src repository
>
> Modified files:
> sys/netinet tcp.h tcp_input.c tcp_subr.c tcp_var.h
> Log:
> Add tcp_log_addrs() function to generate and standardized TCP log line
> for use thoughout the tcp subsystem.
>
> It is IPv4 and IPv6 aware creates a line in the following format:
>
> "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags <RST>"
>
> A "\n" is not included at the end. The caller is supposed to add
> further information after the standard tcp log header.
>
> The function returns a NUL terminated string which the caller has
> to free(s, M_TCPLOG) after use. All memory allocation is done
> with M_NOWAIT and the return value may be NULL in memory shortage
> situations.
>
> Either struct in_conninfo || (struct tcphdr && (struct ip || struct
> ip6_hdr) have to be supplied.
>
> Due to ip[6].h header inclusion limitations and ordering issues the
> struct ip and struct ip6_hdr parameters have to be casted and passed
> as void * pointers.
>
> tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
> void *ip6hdr)
>
> Usage example:
>
> struct ip *ip;
> char *tcplog;
>
> if (tcplog = tcp_log_addrs(NULL, th, (void *)ip, NULL)) {
> log(LOG_DEBUG, "%s; %s: Connection attempt to closed port\n",
> tcplog, __func__);
> free(s, M_TCPLOG);
Oops, free(tcplog, M_TCPLOG) obviously.
--
Andre