Hello.
While trying to fix the bug described in a problem report about
'w -n', and finding out that it is somewhat broken*, I came to
the conclusion that our 'struct utmp' is too limiting.
I would like to modernize it as follows:
#define UT_USERSIZE 16
#define UT_LINESIZE 8
#define UT_HOSTSIZE 18 /* increase by two bytes */
struct utmp {
char ut_user[UT_USERSIZE];
char ut_line[UT_LINESIZE];
char ut_host[UT_HOSTSIZE];
uint8_t ut_type; /* new field */
uint8_t ut_flags; /* new field */
uint32_t ut_time;
struct sockaddr ut_saddr; /* new field */
};
leaving us with a 64 byte structure. I also have a patch for a
new function similiar to our login(3): utmp_login(), which takes
the user, line, host, type and sockaddr arguments, puts them into
a struct utmp and proceeds as in login(3).
With the addition of ut_saddr we could store the plain raw network
address in daemons like sshd or telnetd and use the same field in
programs that use the 'struct utmp' to do the Right Thing.
I know we have a pam_lastlog module that cares about utmp and
friends, but to my knowledge there is no simple way to transfer
the raw address data into the pam module; calling utmp_login()
in the daemons directly is straight forward.
Comments?
* As it is now, ut_host is the only place we store information
about the remote host from which the user is logged in.
The code is wrong in -STABLE and removed in -CURRENT.
-STABLE attempts to get the IP address by looking up the
host (succeeds when the complete name is less than UT_HOSTSIZE).
-CURRENT does not even do that and works only when the
code that filled the utmp entry spuriously filled in an IP
address. Not to mention problems with AF_INET6.
ciao,
-robert
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