use strlcpy & strlcat (#74) * refactor checkpubkeyperms() with safe BSD functions fix gcc8 warnings ``` svr-authpubkey.c: In function 'checkpubkeyperms': svr-authpubkey.c:427:2: warning: 'strncat' specified bound 5 equals source length [-Wstringop-overflow=] strncat(filename, "/.ssh", 5); /* strlen("/.ssh") == 5 */ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ svr-authpubkey.c:433:2: warning: 'strncat' specified bound 16 equals source length [-Wstringop-overflow=] strncat(filename, "/authorized_keys", 16); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``` see https://www.sudo.ws/todd/papers/strlcpy.html * restore strlcpy in xstrdup see original https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/xmalloc.c?rev=1.16

Source: dropbear
Section: net
Priority: optional
Maintainer: Gerrit Pape <[email protected]>
Build-Depends: libz-dev
Standards-Version: 3.7.3.0

Package: dropbear
Architecture: any
Depends: ${shlibs:Depends}
Suggests: openssh-client, runit
Description: lightweight SSH2 server and client
 dropbear is a SSH 2 server and client designed to be small enough to
 be used in small memory environments, while still being functional and
 secure enough for general use.
 .
 It implements most required features of the SSH 2 protocol, and other
 features such as X11 and authentication agent forwarding.
 .
 See http://matt.ucc.asn.au/dropbear/dropbear.html