Re: Prochaine étape...

C'est pas bien compliqué à faire …

#include <nss.h>
#include <netdb.h>
#include <errno.h>
/*
 * gcc -fPIC -shared -o libnss_roman.so.2 -Wl,-soname,libnss_roman.so.2 __FILE__
 * Rushed crappy code. DO NOT RUN THIS SHIT ON PRODUCTION SYSTEMS!
 */
enum nss_status _nss_roman_sethostent(int a) { return NSS_STATUS_SUCCESS; }
enum nss_status _nss_roman_endhostent(void) { return NSS_STATUS_SUCCESS; }
enum nss_status _nss_roman_notfound(int* __restrict perr, int* __restrict er) {
 *perr = ENOENT; *er = HOST_NOT_FOUND; return NSS_STATUS_NOTFOUND;
}
enum nss_status _nss_roman_gethostbyaddr_r(const void* __restrict a,
 size_t l, int t, struct hostent* __restrict result,
 char* __restrict b, size_t blen, int* __restrict perrno,
 int* __restrict err) {
 return _nss_roman_notfound(perrno, err);
}
struct buf_use { struct in_addr addr; char* addr_list[2]; };
enum nss_status _nss_roman_gethostbyname2_r(const char* __restrict name,
 int af, struct hostent* __restrict r, char* __restrict buff,
 size_t buflen, int* __restrict perrno, int *__restrict err) {
 if (af != AF_INET && af != AF_UNSPEC)
 return _nss_roman_notfound(perrno, err);
 if (buflen < sizeof (struct buf_use)) {
 *perrno = ERANGE;
 *err = NO_RECOVERY;
 return NSS_STATUS_TRYAGAIN;
 }
 struct buf_use * buf = (void*)buff;
 r->h_addrtype = AF_INET;
 r->h_name = "";
 r->h_length = sizeof (struct in_addr);
 r->h_addr_list = buf->addr_list;
 r->h_addr_list[0] = (void*)&buf->addr;
 r->h_addr_list[1] = 0;
 r->h_aliases = &r->h_addr_list[1];
 buf->addr.s_addr = 0;
 unsigned current_octet = 3;
 unsigned value = 0;
 while (*name) {
 unsigned letter_value = 0;
 switch (*name++) {
 case 'I': letter_value = 1; break;
 case 'V': letter_value = 5; break;
 case 'X': letter_value = 10; break;
 case 'L': letter_value = 50; break;
 case 'C': letter_value = 100; break;
 case '.':
 if (current_octet == 0 || value > 255)
 return _nss_roman_notfound(perrno, err);
 buf->addr.s_addr |= (value << (current_octet * 8));
 value = 0;
 --current_octet;
 continue;
 default:
 return _nss_roman_notfound(perrno, err);
 }
 value += letter_value - 2 * (value % letter_value);
 }
 if (current_octet != 0 || value > 255)
 return _nss_roman_notfound(perrno, err);
 buf->addr.s_addr = htonl(buf->addr.s_addr + value);
 return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_roman_gethostbyname_r(const char* __restrict n,
 struct hostent* __restrict r, char* __restrict buf, size_t len,
 int *__restrict erno, int* __restrict er) {
 return _nss_roman_gethostbyname2_r(n, AF_INET, r, buf, len, erno, er);
}

$ping -c 1 CXXIIIX...I
PING (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_req=1 ttl=64 time=0.053 ms
--- ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.053/0.053/0.053/0.000 ms
$ ping -c 1 CVIIIC.CLXIIX..I
PING (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_req=1 ttl=64 time=8.70 ms
--- ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 8.702/8.702/8.702/0.000 ms
$ ping -c 1 XIIC.CIXC.CCL.CLXXVI
PING (88.191.250.176) 56(84) bytes of data.
64 bytes from prod.linuxfr.org (88.191.250.176): icmp_req=1 ttl=56 time=7.29 ms
--- ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 7.290/7.290/7.290/0.000 ms

Bizarrement, Firefox et chromium n'aime pas vraiment mes bidouillages… Il y a ptet d'autres trucs à implémenter, ou il faudrait peut être qu'ils arrêtent de transformer le nom d'hôte en minuscule.