/* -*- c-file-style: "linux" -*-
-
+
rsync -- fast file replication program
-
+
Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org>
Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
-
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
/**
* @file clientname.c
- *
+ *
* Functions for looking up the remote name or addr of a socket.
*
* This file is now converted to use the new-style getaddrinfo()
#include "rsync.h"
static const char default_name[] = "UNKNOWN";
+extern int am_daemon;
+extern int am_server;
/**
- * Return the IP addr of the client as a string
+ * Return the IP addr of the client as a string
**/
char *client_addr(int fd)
{
- struct sockaddr_storage ss;
- socklen_t length = sizeof ss;
static char addr_buf[100];
static int initialised;
+ struct sockaddr_storage ss;
+ socklen_t length = sizeof ss;
+ char *ssh_info, *p;
- if (initialised) return addr_buf;
+ if (initialised)
+ return addr_buf;
initialised = 1;
- client_sockaddr(fd, &ss, &length);
+ if (am_server) { /* daemon over --rsh mode */
+ strcpy(addr_buf, "0.0.0.0");
+ if ((ssh_info = getenv("SSH_CONNECTION")) != NULL
+ || (ssh_info = getenv("SSH_CLIENT")) != NULL
+ || (ssh_info = getenv("SSH2_CLIENT")) != NULL) {
+ strlcpy(addr_buf, ssh_info, sizeof addr_buf);
+ /* Truncate the value to just the IP address. */
+ if ((p = strchr(addr_buf, ' ')) != NULL)
+ *p = '\0';
+ }
+ } else {
+ client_sockaddr(fd, &ss, &length);
+ getnameinfo((struct sockaddr *)&ss, length,
+ addr_buf, sizeof addr_buf, NULL, 0, NI_NUMERICHOST);
+ }
- getnameinfo((struct sockaddr *)&ss, length,
- addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);
-
return addr_buf;
}
* If anything goes wrong, including the name->addr->name check, then
* we just use "UNKNOWN", so you can use that value in hosts allow
* lines.
+ *
+ * After translation from sockaddr to name we do a forward lookup to
+ * make sure nobody is spoofing PTR records.
**/
char *client_name(int fd)
{
- struct sockaddr_storage ss;
- socklen_t ss_len = sizeof ss;
static char name_buf[100];
static char port_buf[100];
static int initialised;
+ struct sockaddr_storage ss;
+ socklen_t ss_len;
- if (initialised) return name_buf;
+ if (initialised)
+ return name_buf;
strcpy(name_buf, default_name);
initialised = 1;
- client_sockaddr(fd, &ss, &ss_len);
+ memset(&ss, 0, sizeof ss);
+
+ if (am_server) { /* daemon over --rsh mode */
+ char *addr = client_addr(fd);
+ struct addrinfo hint, *answer;
+ int err;
- if (!lookup_name(fd, &ss, ss_len, name_buf, sizeof name_buf, port_buf, sizeof port_buf))
- check_name(fd, &ss, ss_len, name_buf, port_buf);
+ memset(&hint, 0, sizeof hint);
+
+#ifdef AI_NUMERICHOST
+ hint.ai_flags = AI_NUMERICHOST;
+#endif
+ hint.ai_socktype = SOCK_STREAM;
+
+ if ((err = getaddrinfo(addr, NULL, &hint, &answer)) != 0) {
+ rprintf(FLOG, "malformed address %s: %s\n",
+ addr, gai_strerror(err));
+ return name_buf;
+ }
+
+ switch (answer->ai_family) {
+ case AF_INET:
+ ss_len = sizeof (struct sockaddr_in);
+ memcpy(&ss, answer->ai_addr, ss_len);
+ break;
+#ifdef INET6
+ case AF_INET6:
+ ss_len = sizeof (struct sockaddr_in6);
+ memcpy(&ss, answer->ai_addr, ss_len);
+ break;
+#endif
+ }
+ freeaddrinfo(answer);
+ } else {
+ ss_len = sizeof ss;
+ client_sockaddr(fd, &ss, &ss_len);
+ }
+
+ if (lookup_name(fd, &ss, ss_len, name_buf, sizeof name_buf,
+ port_buf, sizeof port_buf) == 0)
+ check_name(fd, &ss, name_buf);
return name_buf;
}
struct sockaddr_storage *ss,
socklen_t *ss_len)
{
+ memset(ss, 0, sizeof *ss);
+
if (getpeername(fd, (struct sockaddr *) ss, ss_len)) {
/* FIXME: Can we really not continue? */
- rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n",
- fd, strerror(errno));
+ rsyserr(FLOG, errno, "getpeername on fd%d failed", fd);
exit_cleanup(RERR_SOCKETIO);
}
#ifdef INET6
- if (get_sockaddr_family(ss) == AF_INET6 &&
+ if (get_sockaddr_family(ss) == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)ss)->sin6_addr)) {
/* OK, so ss is in the IPv6 family, but it is really
* an IPv4 address: something like
struct sockaddr_in6 sin6;
struct sockaddr_in *sin;
- memcpy(&sin6, ss, sizeof(sin6));
+ memcpy(&sin6, ss, sizeof sin6);
sin = (struct sockaddr_in *)ss;
- memset(sin, 0, sizeof(*sin));
+ memset(sin, 0, sizeof *sin);
sin->sin_family = AF_INET;
- *ss_len = sizeof(struct sockaddr_in);
-#ifdef HAVE_SOCKADDR_LEN
+ *ss_len = sizeof (struct sockaddr_in);
+#ifdef HAVE_SOCKADDR_IN_LEN
sin->sin_len = *ss_len;
#endif
sin->sin_port = sin6.sin6_port;
* (IN6_V4MAPPED_TO_SINADDR ?), but it does not seem
* to be present in the Linux headers. */
memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12],
- sizeof(sin->sin_addr));
- }
+ sizeof sin->sin_addr);
+ }
#endif
}
/**
* Look up a name from @p ss into @p name_buf.
+ *
+ * @param fd file descriptor for client socket.
**/
int lookup_name(int fd, const struct sockaddr_storage *ss,
socklen_t ss_len,
char *port_buf, size_t port_buf_len)
{
int name_err;
-
+
/* reverse lookup */
name_err = getnameinfo((struct sockaddr *) ss, ss_len,
name_buf, name_buf_len,
NI_NAMEREQD | NI_NUMERICSERV);
if (name_err != 0) {
strcpy(name_buf, default_name);
- rprintf(FERROR, RSYNC_NAME ": name lookup failed for %s: %s\n",
- client_addr(fd),
- gai_strerror(name_err));
+ rprintf(FLOG, "name lookup failed for %s: %s\n",
+ client_addr(fd), gai_strerror(name_err));
return name_err;
}
{
int ss_family = get_sockaddr_family(ss);
const char fn[] = "compare_addrinfo_sockaddr";
-
+
if (ai->ai_family != ss_family) {
- rprintf(FERROR,
- "%s: response family %d != %d\n",
+ rprintf(FLOG, "%s: response family %d != %d\n",
fn, ai->ai_family, ss_family);
return 1;
}
sin1 = (const struct sockaddr_in *) ss;
sin2 = (const struct sockaddr_in *) ai->ai_addr;
-
- return memcmp(&sin1->sin_addr, &sin2->sin_addr, sizeof sin1->sin_addr);
+
+ return memcmp(&sin1->sin_addr, &sin2->sin_addr,
+ sizeof sin1->sin_addr);
}
+
#ifdef INET6
- else if (ss_family == AF_INET6) {
- /* XXXX */
- return 1;
+ if (ss_family == AF_INET6) {
+ const struct sockaddr_in6 *sin1, *sin2;
+
+ sin1 = (const struct sockaddr_in6 *) ss;
+ sin2 = (const struct sockaddr_in6 *) ai->ai_addr;
+
+ if (ai->ai_addrlen < sizeof (struct sockaddr_in6)) {
+ rprintf(FLOG, "%s: too short sockaddr_in6; length=%d\n",
+ fn, ai->ai_addrlen);
+ return 1;
+ }
+
+ if (memcmp(&sin1->sin6_addr, &sin2->sin6_addr,
+ sizeof sin1->sin6_addr))
+ return 1;
+
+#ifdef HAVE_SOCKADDR_IN6_SCOPE_ID
+ if (sin1->sin6_scope_id != sin2->sin6_scope_id)
+ return 1;
+#endif
+ return 0;
}
#endif /* INET6 */
- else {
- /* don't know */
- return 1;
- }
+
+ /* don't know */
+ return 1;
}
* @p ss -- otherwise we may be being spoofed. If we suspect we are,
* then we don't abort the connection but just emit a warning, and
* change @p name_buf to be "UNKNOWN".
+ *
+ * We don't do anything with the service when checking the name,
+ * because it doesn't seem that it could be spoofed in any way, and
+ * getaddrinfo on random service names seems to cause problems on AIX.
**/
int check_name(int fd,
const struct sockaddr_storage *ss,
- socklen_t ss_len,
- char *name_buf,
- const char *port_buf)
+ char *name_buf)
{
struct addrinfo hints, *res, *res0;
int error;
int ss_family = get_sockaddr_family(ss);
- memset(&hints, 0, sizeof(hints));
+ memset(&hints, 0, sizeof hints);
hints.ai_family = ss_family;
hints.ai_flags = AI_CANONNAME;
hints.ai_socktype = SOCK_STREAM;
- error = getaddrinfo(name_buf, port_buf, &hints, &res0);
+ error = getaddrinfo(name_buf, NULL, &hints, &res0);
if (error) {
- rprintf(FERROR,
- RSYNC_NAME ": forward name lookup for %s failed: %s\n",
+ rprintf(FLOG, "forward name lookup for %s failed: %s\n",
name_buf, gai_strerror(error));
strcpy(name_buf, default_name);
return error;
if (!res0) {
/* We hit the end of the list without finding an
* address that was the same as ss. */
- rprintf(FERROR, RSYNC_NAME
- ": no known address for \"%s\": "
- "spoofed address?\n",
- name_buf);
+ rprintf(FLOG, "no known address for \"%s\": "
+ "spoofed address?\n", name_buf);
strcpy(name_buf, default_name);
} else if (res == NULL) {
/* We hit the end of the list without finding an
* address that was the same as ss. */
- rprintf(FERROR, RSYNC_NAME
- ": %s is not a known address for \"%s\": "
- "spoofed address?\n",
- client_addr(fd),
- name_buf);
+ rprintf(FLOG, "%s is not a known address for \"%s\": "
+ "spoofed address?\n", client_addr(fd), name_buf);
strcpy(name_buf, default_name);
}
freeaddrinfo(res0);
return 0;
}
-
git.samba.org / rsync.git / blobdiff