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Annotation of src/usr.bin/rsync/TODO.md, Revision 1.3

1.1       benno       1: This is a list of possible work projects within openrsync, rated by difficulty.
                      2:
                      3: First, porting: see
                      4: [Porting](https://github.com/kristapsdz/openrsync/blob/master/README.md#Portability)
                      5: for information on this topic.
                      6: I've included the specific security porting topics below.
                      7:
                      8: This list also does not include adding support for features (e.g., **-u** and
                      9: so on).
                     10:
1.3     ! benno      11: - Easy: speed up the uid/gid mapping/remapping with a simple table.
        !            12:   Right now, the code in
        !            13:   [ids.c](https://github.com/kristapsdz/openrsync/blob/master/ids.c)
        !            14:   is simple, but could easily bottleneck with a large number of groups
        !            15:   and files with **-g**.
        !            16:
1.2       benno      17: - Easy: add a hashtable to `blk_find()` in
1.1       benno      18:   [blocks.c](https://github.com/kristapsdz/openrsync/blob/master/blocks.c)
                     19:   for quickly looking up fast-hash matches.
                     20:
                     21: - Easy: print more statistics, such as transfer times and rates.
                     22:
1.2       benno      23: - Easy: tighten the [pledge(2)](https://man.openbsd.org/pledge.2) and
1.1       benno      24:   [unveil(2)](https://man.openbsd.org/unveil.2) to work with **-n**, as
                     25:   it does not touch files.
                     26:
                     27: - Easy: find the shared path for all input files and
                     28:   [unveil(2)](https://man.openbsd.org/unveil.2) only the shared path
                     29:   instead of each one.
                     30:
                     31: - Medium: have the log messages when multiplex writing (server mode) is
                     32:   enabled by flushed out through the multiplex channel.
                     33:   Right now, they're emitted on `stderr` just like with the client.
                     34:
                     35: - Medium: porting the security precautions
                     36:   ([unveil(2)](https://man.openbsd.org/unveil.2),
                     37:   [pledge(2)](https://man.openbsd.org/pledge.2)) to
                     38:   [FreeBSD](https://www.freebsd.org)'s
                     39:   [Capsicum](https://wiki.freebsd.org/Capsicum).
                     40:   Without this in place, you're exposing your file-system to whatever is
                     41:   coming down over the wire.
                     42:   This is certainly possible, as openrsync makes exclusive use of the "at"
                     43:   functions (e.g., [openat(2)](https://man.openbsd.org/openat.2)) for working
                     44:   with files.
                     45:
                     46: - Hard: the same, but for Linux.
                     47:
                     48: Above all, `grep FIXME *.c *.h` and start from there.