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authorAndreas Schneider <asn@samba.org>2011-06-08 14:50:20 +0200
committerAndrew Bartlett <abartlet@samba.org>2011-07-04 18:27:55 +1000
commitc663dfff880634865c4b9f8bad0fa8599899e66a (patch)
treeb00703f55c9e391a295723d7bf625ebce50b6a22 /source3/lib
parent6b86590342799f3fd35700a1cd1f5fd2aba3547c (diff)
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s3-util: Add a get_remote_hostname() function.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Diffstat (limited to 'source3/lib')
-rw-r--r--source3/lib/util_sock.c108
1 files changed, 108 insertions, 0 deletions
diff --git a/source3/lib/util_sock.c b/source3/lib/util_sock.c
index 9b8632b181..a35bd58d11 100644
--- a/source3/lib/util_sock.c
+++ b/source3/lib/util_sock.c
@@ -27,6 +27,7 @@
#include "lib/socket/interfaces.h"
#include "../lib/util/tevent_unix.h"
#include "../lib/util/tevent_ntstatus.h"
+#include "../lib/tsocket/tsocket.h"
const char *client_name(int fd)
{
@@ -1126,6 +1127,113 @@ const char *get_peer_addr(int fd, char *addr, size_t addr_len)
return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
}
+int get_remote_hostname(const struct tsocket_address *remote_address,
+ char **name,
+ TALLOC_CTX *mem_ctx)
+{
+ char name_buf[MAX_DNS_NAME_LENGTH];
+ char tmp_name[MAX_DNS_NAME_LENGTH];
+ struct name_addr_pair nc;
+ struct sockaddr_storage ss;
+ socklen_t len;
+ int rc;
+
+ if (!lp_hostname_lookups()) {
+ nc.name = tsocket_address_inet_addr_string(remote_address,
+ mem_ctx);
+ if (nc.name == NULL) {
+ return -1;
+ }
+
+ len = tsocket_address_bsd_sockaddr(remote_address,
+ (struct sockaddr *) &nc.ss,
+ sizeof(struct sockaddr_storage));
+ if (len < 0) {
+ return -1;
+ }
+
+ store_nc(&nc);
+ lookup_nc(&nc);
+
+ if (nc.name == NULL) {
+ *name = talloc_strdup(mem_ctx, "UNKNOWN");
+ } else {
+ *name = talloc_strdup(mem_ctx, nc.name);
+ }
+ return 0;
+ }
+
+ lookup_nc(&nc);
+
+ ZERO_STRUCT(ss);
+
+ len = tsocket_address_bsd_sockaddr(remote_address,
+ (struct sockaddr *) &ss,
+ sizeof(struct sockaddr_storage));
+ if (len < 0) {
+ return -1;
+ }
+
+ /* it might be the same as the last one - save some DNS work */
+ if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
+ if (nc.name == NULL) {
+ *name = talloc_strdup(mem_ctx, "UNKNOWN");
+ } else {
+ *name = talloc_strdup(mem_ctx, nc.name);
+ }
+ return 0;
+ }
+
+ /* Look up the remote host name. */
+ rc = sys_getnameinfo((struct sockaddr *) &ss,
+ len,
+ name_buf,
+ sizeof(name_buf),
+ NULL,
+ 0,
+ 0);
+ if (rc < 0) {
+ char *p;
+
+ p = tsocket_address_inet_addr_string(remote_address, mem_ctx);
+ if (p == NULL) {
+ return -1;
+ }
+
+ DEBUG(1,("getnameinfo failed for %s with error %s\n",
+ p,
+ gai_strerror(rc)));
+ strlcpy(name_buf, p, sizeof(name_buf));
+
+ talloc_free(p);
+ } else {
+ if (!matchname(name_buf, (struct sockaddr *)&ss, len)) {
+ DEBUG(0,("matchname failed on %s\n", name_buf));
+ strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
+ }
+ }
+
+ strlcpy(tmp_name, name_buf, sizeof(tmp_name));
+ alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
+ if (strstr(name_buf,"..")) {
+ strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
+ }
+
+ nc.name = name_buf;
+ nc.ss = ss;
+
+ store_nc(&nc);
+ lookup_nc(&nc);
+
+ if (nc.name == NULL) {
+ *name = talloc_strdup(mem_ctx, "UNKOWN");
+ } else {
+ *name = talloc_strdup(mem_ctx, nc.name);
+ }
+
+ return 0;
+}
+
/*******************************************************************
Create protected unix domain socket.