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Add maximum padding to fit IPv6-Addresses

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We use a fixed padding for the From column to fit the maximum of a
minimized IPv6-LL-Address and it's interface.
This commit is contained in:
Inrin 2020-05-24 23:22:34 +02:00
parent 320707fcb0
commit b128222477
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GPG Key ID: 7D86782DD863CE10
1 changed files with 20 additions and 3 deletions
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23
src/lastlog.c
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@ -42,6 +42,9 @@
#include <sys/types.h>
#include <time.h>
#include <assert.h>
#ifdef HAVE_LL_HOST
#include <net/if.h>
#endif
#include "defines.h"
#include "prototypes.h"
#include "getdef.h"
@ -109,6 +112,10 @@ static void print_one (/*@null@*/const struct passwd *pw)
char ptime[80];
#endif
#ifdef HAVE_LL_HOST
int maxIPv6Addrlen;
#endif
if (NULL == pw) {
return;
}
@ -150,7 +157,17 @@ static void print_one (/*@null@*/const struct passwd *pw)
/* Print the header only once */
if (!once) {
#ifdef HAVE_LL_HOST
puts (_("Username Port From Latest"));
/*
* ll_host is in minimized form, thus the maximum IPv6 address possible is
* 8*4+7 = 39 characters.
* RFC 4291 2.5.6 states that for LL-addresses fe80+only the interface ID is set,
* thus having a maximum size of 25+1+IFNAMSIZ.
* POSIX says IFNAMSIZ should be 16 characters long including the null byte, thus
* 25+1+IFNAMSIZ >= 42 > 39
*/
/* Link-Local address + % + Interfacename */
maxIPv6Addrlen = 25+1+IFNAMSIZ;
printf (_("Username Port From%*sLatest\n"), maxIPv6Addrlen-3, " ");
#else
puts (_("Username Port Latest"));
#endif
@ -172,8 +189,8 @@ static void print_one (/*@null@*/const struct passwd *pw)
}
#ifdef HAVE_LL_HOST
printf ("%-16s %-8.8s %-16.16s %s\n",
pw->pw_name, ll.ll_line, ll.ll_host, cp);
printf ("%-16s %-8.8s %*s%s\n",
pw->pw_name, ll.ll_line, -maxIPv6Addrlen, ll.ll_host, cp);
#else
printf ("%-16s\t%-8.8s %s\n",
pw->pw_name, ll.ll_line, cp);