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httpdev is a (very) small utility which allows a remote file to appear as a local one, just like iscsi-initiator(8). However, unlike iSCSI, httpdev uses HTTP as a transport, so the remote end only requires a web server. The local end just requires the ability to issue partial-range HTTP commands and read responses. To do that, I wrote a minimalist HTTP client library, although any such library could be used. Again, in contrast to iSCSI, no special protocol is used, there is no encapsulation of SCSI commands, and no framing of blocks, and no needless synthesis of SCSI commands in the initiator, or interpretation of SCSI commands in the target. Discovery requires no login - either one can access a file on a webserver, or one can't. To illustrate its use, the following commands should show how to use the daily ISO images on nyftp to be read as an ISO image on the local machine. # httpdev http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201202061530Z/iso/NetBSD-5.99.64-amd64.iso /mnt & # ls -al /mnt/nyftp.netbsd.org/ total 18 drwxr-xr-x 2 agc agc 1024 Feb 14 05:51 . drwxr-xr-x 2 root wheel 0 Dec 31 1969 .. lrw-r--r-- 1 agc agc 12 Feb 14 05:51 address -> 128.59.23.63 lrw-r--r-- 1 agc agc 16 Feb 14 05:51 hostname -> nyftp.netbsd.org lrw-r--r-- 1 agc agc 4 Feb 14 05:51 port -> http lrw-r--r-- 1 agc agc 14 Feb 14 05:51 product -> NetBSD httpdev -rw-r--r-- 1 agc agc 356603904 Feb 14 05:51 storage lrw-r--r-- 1 agc agc 16 Feb 14 05:51 targetname -> nyftp.netbsd.org lrw-r--r-- 1 agc agc 6 Feb 14 05:51 vendor -> NetBSD lrw-r--r-- 1 agc agc 18 Feb 14 05:51 version -> bozohttpd-20100920 # file /mnt/nyftp.netbsd.org/storage /mnt/nyftp.netbsd.org/storage: # ISO 9660 CD-ROM filesystem data 'NETBSD_59964 ' (bootable) # vnconfig vnd0 /mnt/nyftp.netbsd.org/storage # mount -rt cd9660 /dev/vnd0a /cdrom # ls -al /cdrom total 6467 drwxr-xr-x 17 611 wheel 4096 Dec 31 1969 . drwxr-xr-x 23 root wheel 512 Jan 2 19:53 .. drwxr-xr-x 4 611 wheel 2048 Feb 6 09:21 amd64 drwxr-xr-x 2 611 wheel 6144 Feb 6 09:04 bin -r--r--r-- 1 611 wheel 75120 Feb 6 09:25 boot -rw-r--r-- 1 611 wheel 555 Feb 6 09:25 boot.cfg drwxr-xr-x 2 611 wheel 2048 Feb 6 09:25 dev drwxr-xr-x 26 611 wheel 12288 Feb 6 09:25 etc -r-xr-xr-x 1 611 wheel 3082 Feb 6 09:25 install.sh drwxr-xr-x 2 611 wheel 10240 Feb 6 09:05 lib drwxr-xr-x 3 611 wheel 2048 Feb 6 08:41 libdata drwxr-xr-x 4 611 wheel 2048 Feb 6 09:25 libexec drwxr-xr-x 2 611 wheel 2048 Feb 6 08:41 mnt drwxr-xr-x 2 611 wheel 2048 Feb 6 09:25 mnt2 -rw-r--r-- 1 611 wheel 6175009 Feb 6 09:25 netbsd drwxr-xr-x 2 611 wheel 18432 Feb 6 09:05 sbin drwxr-xr-x 3 611 wheel 2048 Feb 6 08:49 stand -rwxr-xr-x 1 611 wheel 180679 Feb 6 09:25 sysinst -rwxr-xr-x 1 611 wheel 29983 Feb 6 09:25 sysinstmsgs.de -rwxr-xr-x 1 611 wheel 28954 Feb 6 09:25 sysinstmsgs.es -rwxr-xr-x 1 611 wheel 29458 Feb 6 09:25 sysinstmsgs.fr -rwxr-xr-x 1 611 wheel 25761 Feb 6 09:25 sysinstmsgs.pl drwxr-xr-x 2 611 wheel 2048 Feb 6 09:25 targetroot drwxr-xr-x 2 611 wheel 2048 Feb 6 08:41 tmp drwxr-xr-x 8 611 wheel 2048 Feb 6 09:25 usr drwxr-xr-x 2 611 wheel 2048 Feb 6 09:25 var # httpdev uses refuse(3) and the virtdir(3) routines, and a small http client library I wrote. If that was replaced with libcurl, then httpdev could also take advantage of https (assuming we trust the CAs...) As for size: % size ./httpdev text data bss dec hex filename 15065 1328 1128 17521 0x4471 ./httpdev % If someone were wanting to distribute a new release of an operating system, httpdev could be very useful for accessing ISO images on a central webserver, for example. Just saying...
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