treewide: Change .*GPL.*+ licenses to SPDX compatible identifier

The CONTRIBUTING.md requests an (or multiple) SPDX identifier for GPL
licenses. But a lot of packages did use a different, non-SPDX style with a
"+" at the end instead of "-or-later".

Signed-off-by: Sven Eckelmann <[email protected]>

cgi-io: require whitelisting upload locations

Introduce further ACL checks to verify that the request-supplied
upload location may be written to. This prevents overwriting things
like /bin/busybox and allows to confine uploads to specific directories.

To setup the required ACLs, the following ubus command may be used
on the command line:

ubus call session grant '{
  "ubus_rpc_session": "d41d8cd98f00b204e9800998ecf8427e",
  "scope": "cgi-io",
  "objects": [
    [ "/etc/certificates/*", "write" ],
    [ "/var/uploads/*", "write" ]
  ]
}'

Signed-off-by: Jo-Philipp Wich <[email protected]>

cgi-io: Fix bug

The installation name is inconsistent with the code

Signed-off-by: Jianhui Zhao <[email protected]>

cgi-io: support SHA256 checksums for file uploads

Report SHA256 checksums in addition to the MD5 ones to make cgi-io suitable
for sysupgrade image verification.

Also allow stat(), md5sum and/or sha256sum to fail and respond with a JSON
null value instead, leaving it to the frontend to handle errors as needed.

Fixes #4790.

Signed-off-by: Jo-Philipp Wich <[email protected]>

cgi-io: fix stray semicolon

Remove an improperly placed semicolon in order to solve the following
compiler error:

.../main.c:144:3: error: this 'if' clause does not guard... [-Werror=misleading-indentation]
    if (execl("/bin/busybox", "/bin/busybox", "md5sum", file, NULL));
    ^~
    .../main.c:145:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    return NULL;
    ^~~~~~
    cc1: all warnings being treated as errors

Fixes #4723.

Signed-off-by: Jo-Philipp Wich <[email protected]>

cgi-io: merge changes from luci2-io-helper

luci2-io-helper: bugfix buckup script read timeout

Reading files from stdin will block for ever. The uhttpd is killing the
backup process after script_timeout.

Switching read to non blocking mode and add a waitpid for the slave
process does not end in a script_timeout anymore.

Signed-off-by: Florian Eckert <[email protected]>
Signed-off-by: Daniel Golle <[email protected]>

cgi-io: Find and search for libubus.h

Fixes build errors with external toolchains:

[ 33%] Building C object CMakeFiles/cgi-io.dir/main.c.o
/home/florian/dev/openwrt/trunk/build_dir/target-mipsel-unknown-linux-gnu_glibc/cgi-io/main.c:30:21:
fatal error: libubus.h: No such file or directory
 #include <libubus.h>
                     ^
compilation terminated.

Signed-off-by: Florian Fainelli <[email protected]>

treewide: replace my defunct email address

Signed-off-by: Jo-Philipp Wich <[email protected]>

cgi-io: add a small helper cgi that can be used by RPCD based UIs

Signed-off-by: John Crispin <[email protected]>