diff options
Diffstat (limited to 'inet/getnameinfo.c')
| -rw-r--r-- | inet/getnameinfo.c | 402 |
1 files changed, 230 insertions, 172 deletions
diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c index 030447addb..037578f277 100644 --- a/inet/getnameinfo.c +++ b/inet/getnameinfo.c @@ -65,255 +65,313 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include <arpa/inet.h> #ifndef AF_LOCAL -#define AF_LOCAL AF_UNIX +# define AF_LOCAL AF_UNIX #endif /* AF_LOCAL */ #if HOSTTABLE -struct hostent *_addr2hostname_hosts(const char *, int, int); +struct hostent *_addr2hostname_hosts (const char *, int, int); #endif /* HOSTTABLE */ #ifndef min -#define min(x,y) (((x) > (y)) ? (y) : (x)) +# define min(x,y) (((x) > (y)) ? (y) : (x)) #endif /* min */ -static const char *domain; -static char *nrl_domainname(void) +static char * +nrl_domainname (void) { + static const char *domain = NULL; static int first = 1; - if (first) { - - __libc_lock_define_initialized (static, lock); - __libc_lock_lock (lock); - - if (first) { - char *c; - struct hostent *h, th; - int tmpbuflen = 1024; - char *tmpbuf = __alloca(tmpbuflen); - int herror; - - first = 0; - - while (__gethostbyname_r("localhost", &th, tmpbuf, tmpbuflen, &h, - &herror)) { - if (herror == NETDB_INTERNAL) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); - } - } else { - break; - } - } - - if (h && (c = strchr(h->h_name, '.'))) { - domain = __strdup (++c); - goto ret; - } - - while (gethostname (tmpbuf, tmpbuflen)) { - tmpbuflen *= 2; - tmpbuf = __alloca (tmpbuflen); - } - if (c = strchr(tmpbuf, '.')) { - domain = __strdup(++c); - goto ret; - } - - while (__gethostbyname_r(tmpbuf, &th, tmpbuf, tmpbuflen, &h, - &herror)) { - if (herror == NETDB_INTERNAL) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); - } - } else { - break; - } - } - - if (h && (c = strchr(h->h_name, '.'))) { - domain = __strdup(++c); - goto ret; - } - - { - struct in_addr in_addr; + if (first) + { + __libc_lock_define_initialized (static, lock); + __libc_lock_lock (lock); + + if (first) + { + char *c; + struct hostent *h, th; + int tmpbuflen = 1024; + char *tmpbuf = alloca (tmpbuflen); + int herror; + + first = 0; + + while (__gethostbyname_r ("localhost", &th, tmpbuf, tmpbuflen, &h, + &herror)) + { + if (herror == NETDB_INTERNAL && errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } + else + break; + } - in_addr.s_addr = htonl(0x7f000001); + if (h && (c = strchr (h->h_name, '.'))) + domain = __strdup (++c); + else + { + /* The name contains no domain information. Use the name + now to get more information. */ + while (gethostname (tmpbuf, tmpbuflen)) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } - while (__gethostbyaddr_r((const char *)&in_addr, - sizeof(struct in_addr), AF_INET, &th, tmpbuf, - tmpbuflen, &h, &herror)) { - if (herror == NETDB_INTERNAL) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); + if ((c = strchr (tmpbuf, '.'))) + domain = __strdup (++c); + else + { + /* We need to preserve the hostname. */ + const char *hstname = strdupa (tmpbuf); + + while (__gethostbyname_r (hstname, &th, tmpbuf, tmpbuflen, + &h, &herror)) + { + if (herror == NETDB_INTERNAL && errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } + else + break; + } + + if (h && (c = strchr(h->h_name, '.'))) + domain = __strdup (++c); + else + { + struct in_addr in_addr; + + in_addr.s_addr = htonl (0x7f000001); + + while (__gethostbyaddr_r ((const char *) &in_addr, + sizeof (struct in_addr), + AF_INET, &th, tmpbuf, + tmpbuflen, &h, &herror)) + { + if (herror == NETDB_INTERNAL && errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } + else + break; + } + + if (h && (c = strchr (h->h_name, '.'))) + domain = __strdup (++c); + } + } } - } else { - break; - } - } - - if (h && (c = strchr(h->h_name, '.'))) { - domain = __strdup(++c); - goto ret; } - } + __libc_lock_unlock (lock); } - ret: - __libc_lock_unlock (lock); - } - return domain; }; -int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t hostlen, char *serv, size_t servlen, int flags) + +int +getnameinfo (const struct sockaddr *sa, size_t addrlen, char *host, + size_t hostlen, char *serv, size_t servlen, int flags) { int serrno = errno; int tmpbuflen = 1024; int herrno; - char *tmpbuf = __alloca(tmpbuflen); + char *tmpbuf = alloca (tmpbuflen); struct hostent th; - if (!sa) + if (sa == NULL) return -1; - if (host && (hostlen > 0)) - switch(sa->sa_family) { + if (host != NULL && hostlen > 0) + switch(sa->sa_family) + { case AF_INET: #if INET6 case AF_INET6: #endif /* INET6 */ - if (!(flags & NI_NUMERICHOST)) { - struct hostent *h = NULL; + if (!(flags & NI_NUMERICHOST)) + { + struct hostent *h = NULL; #if HOSTTABLE -#if INET6 - if (sa->sa_family == AF_INET6) - h = _addr2hostname_hosts((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6); - else -#endif /* INET6 */ - h = _addr2hostname_hosts((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET); +# if INET6 + if (sa->sa_family == AF_INET6) + h = _addr2hostname_hosts ((void *) &(((struct sockaddr_in6 *) sa)->sin6_addr), + sizeof(struct in6_addr), AF_INET6); + else +# endif /* INET6 */ + h = _addr2hostname_hosts ((void *)& (((struct sockaddr_in *) sa)->sin_addr), + sizeof(struct in_addr), AF_INET); #endif /* HOSTTABLE */ #if RESOLVER - if (!h) { + if (h == NULL) + { #if INET6 - if (sa->sa_family == AF_INET6) { - while (__gethostbyaddr_r((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6, &th, tmpbuf, tmpbuflen, &h, &herrno)) { - if (herrno == NETDB_INTERNAL) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); - } else { - __set_h_errno(herrno); - goto fail; + if (sa->sa_family == AF_INET6) + { + while (__gethostbyaddr_r ((void *) &(((struct sockaddr_in6 *) sa)->sin6_addr), + sizeof(struct in6_addr), + AF_INET6, &th, tmpbuf, tmpbuflen, + &h, &herrno)) + { + if (herrno == NETDB_INTERNAL) + { + if (errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } + else + { + __set_h_errno (herrno); + goto fail; + } + } + else + { + break; + } + } } - } else { - break; - } - } - } else { + else + { #endif /* INET6 */ - while (__gethostbyaddr_r((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET, &th, tmpbuf, tmpbuflen, &h, &herrno)) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); - } else { - break; - } + while (__gethostbyaddr_r ((void *) &(((struct sockaddr_in *)sa)->sin_addr), + sizeof(struct in_addr), AF_INET, + &th, tmpbuf, tmpbuflen, + &h, &herrno)) + { + if (errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = alloca (tmpbuflen); + } + else + { + break; + } + } + } } - } - } #endif /* RESOLVER */ - if (h) { - if (flags & NI_NOFQDN) { - char *c; - if ((c = nrl_domainname()) && (c = strstr(h->h_name, c)) && (c != h->h_name) && (*(--c) == '.')) { - strncpy(host, h->h_name, min(hostlen, (size_t) (c - h->h_name))); + if (h) + { + if (flags & NI_NOFQDN) + { + char *c; + if ((c = nrl_domainname ()) && (c = strstr(h->h_name, c)) + && (c != h->h_name) && (*(--c) == '.')) + { + strncpy (host, h->h_name, + min(hostlen, (size_t) (c - h->h_name))); + break; + } + } + strncpy (host, h->h_name, hostlen); break; - }; - }; - strncpy(host, h->h_name, hostlen); - break; - }; - }; + } + } if (flags & NI_NAMEREQD) goto fail; - - { - const char *c; + else + { + const char *c; #if INET6 - if (sa->sa_family == AF_INET6) - c = inet_ntop(AF_INET6, (void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), host, hostlen); - else + if (sa->sa_family == AF_INET6) + c = inet_ntop (AF_INET6, + (void *) &(((struct sockaddr_in6 *) sa)->sin6_addr), + host, hostlen); + else #endif /* INET6 */ - c = inet_ntop(AF_INET, (void *)&(((struct sockaddr_in *)sa)->sin_addr), host, hostlen); + c = inet_ntop (AF_INET, + (void *) &(((struct sockaddr_in *) sa)->sin_addr), + host, hostlen); - if (!c) - goto fail; - }; + if (!c) + goto fail; + } break; + #if LOCAL case AF_LOCAL: - if (!(flags & NI_NUMERICHOST)) { - struct utsname utsname; + if (!(flags & NI_NUMERICHOST)) + { + struct utsname utsname; - if (!uname(&utsname)) { - strncpy(host, utsname.nodename, hostlen); - break; + if (!uname (&utsname)) + { + strncpy (host, utsname.nodename, hostlen); + break; + }; }; - }; if (flags & NI_NAMEREQD) goto fail; - strncpy(host, "localhost", hostlen); + strncpy (host, "localhost", hostlen); break; #endif /* LOCAL */ + default: return -1; - }; + } if (serv && (servlen > 0)) - switch(sa->sa_family) { + switch(sa->sa_family) + { case AF_INET: #if INET6 case AF_INET6: #endif /* INET6 */ - if (!(flags & NI_NUMERICSERV)) { - struct servent *s, ts; - while (__getservbyport_r(((struct sockaddr_in *)sa)->sin_port, ((flags & NI_DGRAM) ? "udp" : "tcp"), &ts, tmpbuf, tmpbuflen, &s)) { - if (herrno == NETDB_INTERNAL) { - if (errno == ERANGE) { - tmpbuflen *= 2; - tmpbuf = __alloca(tmpbuflen); - } else { - goto fail; + if (!(flags & NI_NUMERICSERV)) + { + struct servent *s, ts; + while (__getservbyport_r (((struct sockaddr_in *) sa)->sin_port, + ((flags & NI_DGRAM) ? "udp" : "tcp"), + &ts, tmpbuf, tmpbuflen, &s)) + { + if (herrno == NETDB_INTERNAL) + { + if (errno == ERANGE) + { + tmpbuflen *= 2; + tmpbuf = __alloca(tmpbuflen); + } + else + goto fail; + } + else + { + break; + } + } + if (s) + { + strncpy(serv, s->s_name, servlen); + break; } - } else { - break; - } } - if (s) { - strncpy(serv, s->s_name, servlen); - break; - }; - }; - snprintf(serv, servlen, "%d", ntohs(((struct sockaddr_in *)sa)->sin_port)); + snprintf (serv, servlen, "%d", + ntohs (((struct sockaddr_in *) sa)->sin_port)); break; + #if LOCAL case AF_LOCAL: - strncpy(serv, ((struct sockaddr_un *)sa)->sun_path, servlen); + strncpy (serv, ((struct sockaddr_un *) sa)->sun_path, servlen); break; #endif /* LOCAL */ - }; + } + if (host && (hostlen > 0)) host[hostlen-1] = 0; if (serv && (servlen > 0)) |