[stgt] [PATCH 5/5] Call user defined callback program with initiator info

[FUJITA Tomonori]

On Fri, 17 Sep 2010 18:02:11 -0700
Chandra Seetharaman <sekharan at us.ibm.com> wrote:

> Add argument passing to callback.
> 
> Callback program is called with target name and ipv4 or ipv6 address (as
> unsigned int parameters).
> 
> For ipv4, initiator address from sin_addr.s_addr is sent as an unsigned
> int argument.
> 
> For example, when 10.0.0.1 is the initiator, the callback program
> "/usr/local/bin/redirect" is called as
> 	/usr/local/bin/redirect targetname 16777226
> 
> For ipv6, sin6_addr->s6_addr32[0] thru sin6_addr->s6_addr32[3] are sent
> as four unisgned int arguments, as in
> 	/usr/local/bin/redirect targetname 12345 98765 12233 34535
> 
> Signed-Off-By: Chandra Seetharaman <sekharan at us.ibm.com>
> ---
>  usr/iscsi/target.c |   25 +++++++++++++++++++------
>  1 file changed, 19 insertions(+), 6 deletions(-)
> 
> Index: tgt-1.0.8/usr/iscsi/target.c
> ===================================================================
> --- tgt-1.0.8.orig/usr/iscsi/target.c
> +++ tgt-1.0.8/usr/iscsi/target.c
> @@ -197,9 +197,27 @@ int target_redirected(struct iscsi_targe
>  	socklen_t len;
>  	int ret, rsn;
>  	char *p, *q, *str, *port, *addr;
> -	char buffer[NI_MAXHOST + NI_MAXSERV + 4];
> +	char buffer[NI_MAXHOST + NI_MAXSERV + 4], in_buf[1024];
> +
> +	len = sizeof(from);
> +	ret = conn->tp->ep_getpeername(conn, (struct sockaddr *)&from, &len);
> +	if (ret < 0)
> +		return 0;
>  
>  	if (target->redirect_info.callback) {
> +		p = in_buf;
> +		p += sprintf(p, "%s ", target->redirect_info.callback);
> +		p += sprintf(p, "%s ", tgt_targetname(target->tid));
> +		if (((struct sockaddr *)&from)->sa_family == AF_INET)
> +			sprintf(p, " %u", (((struct sockaddr_in *)
> +					&from)->sin_addr.s_addr));
> +		else {
> +			struct in6_addr *a1 = &((struct sockaddr_in6 *)
> +						&from)->sin6_addr;
> +			sprintf(p, " %u %u %u %u", a1->s6_addr32[0],
> +				a1->s6_addr32[1], a1->s6_addr32[2],
> +				a1->s6_addr32[3]);

The above means we get different arguments on big and little endian
boxes?

Passing an address string is simpler like the following?

ipv4 -> 192.168.10.1:3260
ipv6 -> [2001:2c0:418:1::2]:3260
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