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Diffstat (limited to 'inet/getnameinfo.c')
-rw-r--r--inet/getnameinfo.c158
1 files changed, 124 insertions, 34 deletions
diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c
index b9454f6396..95ed6bf3f9 100644
--- a/inet/getnameinfo.c
+++ b/inet/getnameinfo.c
@@ -45,6 +45,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#define INET6 1
#define LOCAL 1
#define HOSTTABLE 0
+#define RESOLVER 1
#include <sys/types.h>
#include <sys/socket.h>
@@ -59,6 +60,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <string.h>
#include <stdio.h>
#include <unistd.h>
+#include <alloca.h>
+#include <libc-lock.h>
+#include <arpa/inet.h>
#ifndef AF_LOCAL
#define AF_LOCAL AF_UNIX
@@ -79,39 +83,91 @@ struct hostent *_addr2hostname_hosts(const char *, int, int);
static char *domain;
static char domainbuffer[MAXHOSTNAMELEN];
-
-static char *
-nrl_domainname (void)
+static char *nrl_domainname(void)
{
static int first = 1;
if (first) {
- char *c;
- struct hostent *h;
-
- first = 0;
-
- if ((h = gethostbyname("localhost")) && (c = strchr(h->h_name, '.')))
- return strcpy(domain = domainbuffer, ++c);
-
- if (!gethostname(domainbuffer, sizeof(domainbuffer))) {
- if (c = strchr(domainbuffer, '.'))
- return (domain = ++c);
-
- if ((h = gethostbyname(domainbuffer)) && (c = strchr(h->h_name, '.')))
- return strcpy(domain = domainbuffer, ++c);
- }
- {
- struct in_addr in_addr;
+ __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, '.'))) {
+ strcpy(domain = domainbuffer, ++c);
+ goto ret;
+ }
+
+ if (!gethostname(domainbuffer, sizeof(domainbuffer))) {
+ if (c = strchr(domainbuffer, '.')) {
+ domain = ++c;
+ goto ret;
+ }
+
+ while (__gethostbyname_r(domainbuffer, &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, '.'))) {
+ strcpy(domain = domainbuffer, ++c);
+ goto ret;
+ }
+ }
+
+ {
+ 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) {
+ if (errno == ERANGE) {
+ tmpbuflen *= 2;
+ tmpbuf = __alloca(tmpbuflen);
+ }
+ } else {
+ break;
+ }
+ }
- in_addr.s_addr = htonl(0x7f000001);
+ if (h && (c = strchr(h->h_name, '.'))) {
+ domain = domainbuffer, ++c;
+ goto ret;
+ }
+ }
- if ((h = gethostbyaddr((const char *)&in_addr, sizeof(struct in_addr), AF_INET)) && (c = strchr(h->h_name, '.')))
- return strcpy(domain = domainbuffer, ++c);
}
- return NULL;
+ ret:
+ __libc_lock_unlock (lock);
};
return domain;
@@ -120,6 +176,10 @@ nrl_domainname (void)
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);
+ struct hostent th;
if (!sa)
return -1;
@@ -144,20 +204,39 @@ int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t ho
#if RESOLVER
if (!h) {
#if INET6
- if (sa->sa_family == AF_INET6)
- h = gethostbyaddr((void *)&(((struct sockaddr_in6 *)sa)->sin6_addr), sizeof(struct in6_addr), AF_INET6);
- else
+ 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 {
#endif /* INET6 */
- h = gethostbyaddr((void *)&(((struct sockaddr_in *)sa)->sin_addr), sizeof(struct in_addr), AF_INET);
- endhostent();
- };
+ 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, (c - h->h_name)));
+ strncpy(host, h->h_name, min(hostlen, (size_t) (c - h->h_name)));
break;
};
};
@@ -210,8 +289,20 @@ int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t ho
case AF_INET6:
#endif /* INET6 */
if (!(flags & NI_NUMERICSERV)) {
- struct servent *s;
- if (s = getservbyport(((struct sockaddr_in *)sa)->sin_port, (flags & NI_DGRAM) ? "udp" : "tcp")) {
+ 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;
};
@@ -224,7 +315,6 @@ int getnameinfo(const struct sockaddr *sa, size_t addrlen, char *host, size_t ho
break;
#endif /* LOCAL */
};
-
if (host && (hostlen > 0))
host[hostlen-1] = 0;
if (serv && (servlen > 0))