Re: HOSTALIASES ne fonctionne pas sur debian?
Salut,
> $ export HOSTALIASES=~/.hosts
> $ echo 127.0.0.1 wow> $HOSTALIASES
> $ ping wow
> ping: wow: Aucune adresse associée avec le nom de l'hôte
>
Il me semble que ping n'utilise pas gethostbyname mais getaddrinfo:
bash$ sudo ltrace ping google.com
__cxa_atexit(0x5574d608c060, 0, 0x5574d6092328, 0) = 0
cap_get_proc(0x7f1acd5be718, 1, 3, 32) = 0x5574d71af294
cap_init(0x5574d71af294, 0x5574d71af29c, 0x5574d71af290, 0x7f1acd4fcd17)
= 0x5574d71af2c4
cap_get_flag(0x5574d71af294, 12, 1, 0x7fff8da6a454) = 0
cap_set_flag(0x5574d71af2c4, 1, 1, 0x5574d60923e0) = 0
cap_get_flag(0x5574d71af294, 13, 1, 0x7fff8da6a454) = 0
cap_set_flag(0x5574d71af2c4, 1, 1, 0x5574d60923e4) = 0
cap_set_proc(0x5574d71af2c4, 1, 0x3000, 4096) = 0
prctl(8, 1, 0x3000, 0x7f1acd4fcd47) = 0
getuid() = 0
setuid(0) = 0
prctl(8, 0, 0x3000, 0) = 0
cap_free(0x5574d71af2c4, 0, 0x3000, 0x7f1acd4fd0aa) = 0
cap_free(0x5574d71af294, 1, 0, 0x5574d71af010) = 0
getuid() = 0
geteuid() = 0
setlocale(LC_ALL, "") =
"LC_CTYPE=en_US.UTF-8;LC_NUMERIC="...
bindtextdomain("iputils", "/usr/share/locale") = "/usr/share/locale"
textdomain("iputils") = "iputils"
strlen("ping") = 4
getopt(2, 0x7fff8da6a5f8, "h?4bRT:6F:N:aABc:dDfi:I:l:Lm:M:n"...) = -1
cap_get_proc(13, 1, 1, 0) = 0x5574d71af2c4
cap_get_flag(0x5574d71af2c4, 13, 1, 0x7fff8da6a454) = 0
cap_set_flag(0x5574d71af2c4, 0, 1, 0x7fff8da6a44c) = 0
cap_set_proc(0x5574d71af2c4, 0, 8192, 0) = 0
cap_free(0x5574d71af2c4, 0x5574d71af2cc, 8192, 0x7f1acd4fcd47) = 0
__errno_location() = 0x7f1acd3def80
socket(2, 2, 1) = -1
socket(2, 3, 1) = 3
__errno_location() = 0x7f1acd3def80
socket(10, 2, 58) = -1
socket(10, 3, 58) = 4
cap_get_proc(13, 0, 58, 0x7f1acd4fdac7) = 0x5574d71af2c4
cap_get_flag(0x5574d71af2c4, 13, 1, 0x7fff8da6a454) = 0
cap_set_flag(0x5574d71af2c4, 0, 1, 0x7fff8da6a44c) = 0
cap_set_proc(0x5574d71af2c4, 0, 0, 0) = 0
cap_free(0x5574d71af2c4, 0x5574d71af2cc, 0, 0x7f1acd4fcd47) = 0
getaddrinfo("google.com", nil, 0x7fff8da6a4b0, 0x7fff8da6a498) = 0
inet_aton("google.com", { 0 }) = 0
...
Par ailleurs, getaddrinfo est plus simple à utiliser que gethostbyname
: ça te retourne les resolutions avec tous les type de familles ; et il
ne faut pas oublier ce buffer overflow (aka "GHOST") :
https://www.qualys.com/2015/01/27/cve-2015-0235/GHOST-CVE-2015-0235.txt
--
Nisar JAGABAR
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((_/)o o(\_))
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